drivers/irqchip/irq-gic-v3-its.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013-2017 ARM Limited, All Rights Reserved.
   4  * Author: Marc Zyngier <marc.zyngier@arm.com>
   5  */
   6
   7 #include <linux/acpi.h>
   8 #include <linux/acpi_iort.h>
   9 #include <linux/bitfield.h>
  10 #include <linux/bitmap.h>
  11 #include <linux/cpu.h>
  12 #include <linux/crash_dump.h>
  13 #include <linux/delay.h>
  14 #include <linux/dma-iommu.h>
  15 #include <linux/efi.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/iopoll.h>
  18 #include <linux/irqdomain.h>
  19 #include <linux/list.h>
  20 #include <linux/log2.h>
  21 #include <linux/memblock.h>
  22 #include <linux/mm.h>
  23 #include <linux/msi.h>
  24 #include <linux/of.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_irq.h>
  27 #include <linux/of_pci.h>
  28 #include <linux/of_platform.h>
  29 #include <linux/percpu.h>
  30 #include <linux/slab.h>
  31 #include <linux/syscore_ops.h>
  32
  33 #include <linux/irqchip.h>
  34 #include <linux/irqchip/arm-gic-v3.h>
  35 #include <linux/irqchip/arm-gic-v4.h>
  36
  37 #include <asm/cputype.h>
  38 #include <asm/exception.h>
  39
  40 #include "irq-gic-common.h"
  41
  42 #define ITS_FLAGS_CMDQ_NEEDS_FLUSHING           (1ULL << 0)
  43 #define ITS_FLAGS_WORKAROUND_CAVIUM_22375       (1ULL << 1)
  44 #define ITS_FLAGS_WORKAROUND_CAVIUM_23144       (1ULL << 2)
  45 #define ITS_FLAGS_SAVE_SUSPEND_STATE            (1ULL << 3)
  46
  47 #define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING     (1 << 0)
  48 #define RDIST_FLAGS_RD_TABLES_PREALLOCATED      (1 << 1)
  49
  50 static u32 lpi_id_bits;
  51
  52 /*
  53  * We allocate memory for PROPBASE to cover 2 ^ lpi_id_bits LPIs to
  54  * deal with (one configuration byte per interrupt). PENDBASE has to
  55  * be 64kB aligned (one bit per LPI, plus 8192 bits for SPI/PPI/SGI).
  56  */
  57 #define LPI_NRBITS              lpi_id_bits
  58 #define LPI_PROPBASE_SZ         ALIGN(BIT(LPI_NRBITS), SZ_64K)
  59 #define LPI_PENDBASE_SZ         ALIGN(BIT(LPI_NRBITS) / 8, SZ_64K)
  60
  61 #define LPI_PROP_DEFAULT_PRIO   GICD_INT_DEF_PRI
  62
  63 /*
  64  * Collection structure - just an ID, and a redistributor address to
  65  * ping. We use one per CPU as a bag of interrupts assigned to this
  66  * CPU.
  67  */
  68 struct its_collection {
  69         u64                     target_address;
  70         u16                     col_id;
  71 };
  72
  73 /*
  74  * The ITS_BASER structure - contains memory information, cached
  75  * value of BASER register configuration and ITS page size.
  76  */
  77 struct its_baser {
  78         void            *base;
  79         u64             val;
  80         u32             order;
  81         u32             psz;
  82 };
  83
  84 struct its_device;
  85
  86 /*
  87  * The ITS structure - contains most of the infrastructure, with the
  88  * top-level MSI domain, the command queue, the collections, and the
  89  * list of devices writing to it.
  90  *
  91  * dev_alloc_lock has to be taken for device allocations, while the
  92  * spinlock must be taken to parse data structures such as the device
  93  * list.
  94  */
  95 struct its_node {
  96         raw_spinlock_t          lock;
  97         struct mutex            dev_alloc_lock;
  98         struct list_head        entry;
  99         void __iomem            *base;
 100         void __iomem            *sgir_base;
 101         phys_addr_t             phys_base;
 102         struct its_cmd_block    *cmd_base;
 103         struct its_cmd_block    *cmd_write;
 104         struct its_baser        tables[GITS_BASER_NR_REGS];
 105         struct its_collection   *collections;
 106         struct fwnode_handle    *fwnode_handle;
 107         u64                     (*get_msi_base)(struct its_device *its_dev);
 108         u64                     typer;
 109         u64                     cbaser_save;
 110         u32                     ctlr_save;
 111         u32                     mpidr;
 112         struct list_head        its_device_list;
 113         u64                     flags;
 114         unsigned long           list_nr;
 115         int                     numa_node;
 116         unsigned int            msi_domain_flags;
 117         u32                     pre_its_base; /* for Socionext Synquacer */
 118         int                     vlpi_redist_offset;
 119 };
 120
 121 #define is_v4(its)              (!!((its)->typer & GITS_TYPER_VLPIS))
 122 #define is_v4_1(its)            (!!((its)->typer & GITS_TYPER_VMAPP))
 123 #define device_ids(its)         (FIELD_GET(GITS_TYPER_DEVBITS, (its)->typer) + 1)
 124
 125 #define ITS_ITT_ALIGN           SZ_256
 126
 127 /* The maximum number of VPEID bits supported by VLPI commands */
 128 #define ITS_MAX_VPEID_BITS                                              \
 129         ({                                                              \
 130                 int nvpeid = 16;                                        \
 131                 if (gic_rdists->has_rvpeid &&                           \
 132                     gic_rdists->gicd_typer2 & GICD_TYPER2_VIL)          \
 133                         nvpeid = 1 + (gic_rdists->gicd_typer2 &         \
 134                                       GICD_TYPER2_VID);                 \
 135                                                                         \
 136                 nvpeid;                                                 \
 137         })
 138 #define ITS_MAX_VPEID           (1 << (ITS_MAX_VPEID_BITS))
 139
 140 /* Convert page order to size in bytes */
 141 #define PAGE_ORDER_TO_SIZE(o)   (PAGE_SIZE << (o))
 142
 143 struct event_lpi_map {
 144         unsigned long           *lpi_map;
 145         u16                     *col_map;
 146         irq_hw_number_t         lpi_base;
 147         int                     nr_lpis;
 148         raw_spinlock_t          vlpi_lock;
 149         struct its_vm           *vm;
 150         struct its_vlpi_map     *vlpi_maps;
 151         int                     nr_vlpis;
 152 };
 153
 154 /*
 155  * The ITS view of a device - belongs to an ITS, owns an interrupt
 156  * translation table, and a list of interrupts.  If it some of its
 157  * LPIs are injected into a guest (GICv4), the event_map.vm field
 158  * indicates which one.
 159  */
 160 struct its_device {
 161         struct list_head        entry;
 162         struct its_node         *its;
 163         struct event_lpi_map    event_map;
 164         void                    *itt;
 165         u32                     nr_ites;
 166         u32                     device_id;
 167         bool                    shared;
 168 };
 169
 170 static struct {
 171         raw_spinlock_t          lock;
 172         struct its_device       *dev;
 173         struct its_vpe          **vpes;
 174         int                     next_victim;
 175 } vpe_proxy;
 176
 177 struct cpu_lpi_count {
 178         atomic_t        managed;
 179         atomic_t        unmanaged;
 180 };
 181
 182 static DEFINE_PER_CPU(struct cpu_lpi_count, cpu_lpi_count);
 183
 184 static LIST_HEAD(its_nodes);
 185 static DEFINE_RAW_SPINLOCK(its_lock);
 186 static struct rdists *gic_rdists;
 187 static struct irq_domain *its_parent;
 188
 189 static unsigned long its_list_map;
 190 static u16 vmovp_seq_num;
 191 static DEFINE_RAW_SPINLOCK(vmovp_lock);
 192
 193 static DEFINE_IDA(its_vpeid_ida);
 194
 195 #define gic_data_rdist()                (raw_cpu_ptr(gic_rdists->rdist))
 196 #define gic_data_rdist_cpu(cpu)         (per_cpu_ptr(gic_rdists->rdist, cpu))
 197 #define gic_data_rdist_rd_base()        (gic_data_rdist()->rd_base)
 198 #define gic_data_rdist_vlpi_base()      (gic_data_rdist_rd_base() + SZ_128K)
 199
 200 /*
 201  * Skip ITSs that have no vLPIs mapped, unless we're on GICv4.1, as we
 202  * always have vSGIs mapped.
 203  */
 204 static bool require_its_list_vmovp(struct its_vm *vm, struct its_node *its)
 205 {
 206         return (gic_rdists->has_rvpeid || vm->vlpi_count[its->list_nr]);
 207 }
 208
 209 static u16 get_its_list(struct its_vm *vm)
 210 {
 211         struct its_node *its;
 212         unsigned long its_list = 0;
 213
 214         list_for_each_entry(its, &its_nodes, entry) {
 215                 if (!is_v4(its))
 216                         continue;
 217
 218                 if (require_its_list_vmovp(vm, its))
 219                         __set_bit(its->list_nr, &its_list);
 220         }
 221
 222         return (u16)its_list;
 223 }
 224
 225 static inline u32 its_get_event_id(struct irq_data *d)
 226 {
 227         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
 228         return d->hwirq - its_dev->event_map.lpi_base;
 229 }
 230
 231 static struct its_collection *dev_event_to_col(struct its_device *its_dev,
 232                                                u32 event)
 233 {
 234         struct its_node *its = its_dev->its;
 235
 236         return its->collections + its_dev->event_map.col_map[event];
 237 }
 238
 239 static struct its_vlpi_map *dev_event_to_vlpi_map(struct its_device *its_dev,
 240                                                u32 event)
 241 {
 242         if (WARN_ON_ONCE(event >= its_dev->event_map.nr_lpis))
 243                 return NULL;
 244
 245         return &its_dev->event_map.vlpi_maps[event];
 246 }
 247
 248 static struct its_vlpi_map *get_vlpi_map(struct irq_data *d)
 249 {
 250         if (irqd_is_forwarded_to_vcpu(d)) {
 251                 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
 252                 u32 event = its_get_event_id(d);
 253
 254                 return dev_event_to_vlpi_map(its_dev, event);
 255         }
 256
 257         return NULL;
 258 }
 259
 260 static int vpe_to_cpuid_lock(struct its_vpe *vpe, unsigned long *flags)
 261 {
 262         raw_spin_lock_irqsave(&vpe->vpe_lock, *flags);
 263         return vpe->col_idx;
 264 }
 265
 266 static void vpe_to_cpuid_unlock(struct its_vpe *vpe, unsigned long flags)
 267 {
 268         raw_spin_unlock_irqrestore(&vpe->vpe_lock, flags);
 269 }
 270
 271 static int irq_to_cpuid_lock(struct irq_data *d, unsigned long *flags)
 272 {
 273         struct its_vlpi_map *map = get_vlpi_map(d);
 274         int cpu;
 275
 276         if (map) {
 277                 cpu = vpe_to_cpuid_lock(map->vpe, flags);
 278         } else {
 279                 /* Physical LPIs are already locked via the irq_desc lock */
 280                 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
 281                 cpu = its_dev->event_map.col_map[its_get_event_id(d)];
 282                 /* Keep GCC quiet... */
 283                 *flags = 0;
 284         }
 285
 286         return cpu;
 287 }
 288
 289 static void irq_to_cpuid_unlock(struct irq_data *d, unsigned long flags)
 290 {
 291         struct its_vlpi_map *map = get_vlpi_map(d);
 292
 293         if (map)
 294                 vpe_to_cpuid_unlock(map->vpe, flags);
 295 }
 296
 297 static struct its_collection *valid_col(struct its_collection *col)
 298 {
 299         if (WARN_ON_ONCE(col->target_address & GENMASK_ULL(15, 0)))
 300                 return NULL;
 301
 302         return col;
 303 }
 304
 305 static struct its_vpe *valid_vpe(struct its_node *its, struct its_vpe *vpe)
 306 {
 307         if (valid_col(its->collections + vpe->col_idx))
 308                 return vpe;
 309
 310         return NULL;
 311 }
 312
 313 /*
 314  * ITS command descriptors - parameters to be encoded in a command
 315  * block.
 316  */
 317 struct its_cmd_desc {
 318         union {
 319                 struct {
 320                         struct its_device *dev;
 321                         u32 event_id;
 322                 } its_inv_cmd;
 323
 324                 struct {
 325                         struct its_device *dev;
 326                         u32 event_id;
 327                 } its_clear_cmd;
 328
 329                 struct {
 330                         struct its_device *dev;
 331                         u32 event_id;
 332                 } its_int_cmd;
 333
 334                 struct {
 335                         struct its_device *dev;
 336                         int valid;
 337                 } its_mapd_cmd;
 338
 339                 struct {
 340                         struct its_collection *col;
 341                         int valid;
 342                 } its_mapc_cmd;
 343
 344                 struct {
 345                         struct its_device *dev;
 346                         u32 phys_id;
 347                         u32 event_id;
 348                 } its_mapti_cmd;
 349
 350                 struct {
 351                         struct its_device *dev;
 352                         struct its_collection *col;
 353                         u32 event_id;
 354                 } its_movi_cmd;
 355
 356                 struct {
 357                         struct its_device *dev;
 358                         u32 event_id;
 359                 } its_discard_cmd;
 360
 361                 struct {
 362                         struct its_collection *col;
 363                 } its_invall_cmd;
 364
 365                 struct {
 366                         struct its_vpe *vpe;
 367                 } its_vinvall_cmd;
 368
 369                 struct {
 370                         struct its_vpe *vpe;
 371                         struct its_collection *col;
 372                         bool valid;
 373                 } its_vmapp_cmd;
 374
 375                 struct {
 376                         struct its_vpe *vpe;
 377                         struct its_device *dev;
 378                         u32 virt_id;
 379                         u32 event_id;
 380                         bool db_enabled;
 381                 } its_vmapti_cmd;
 382
 383                 struct {
 384                         struct its_vpe *vpe;
 385                         struct its_device *dev;
 386                         u32 event_id;
 387                         bool db_enabled;
 388                 } its_vmovi_cmd;
 389
 390                 struct {
 391                         struct its_vpe *vpe;
 392                         struct its_collection *col;
 393                         u16 seq_num;
 394                         u16 its_list;
 395                 } its_vmovp_cmd;
 396
 397                 struct {
 398                         struct its_vpe *vpe;
 399                 } its_invdb_cmd;
 400
 401                 struct {
 402                         struct its_vpe *vpe;
 403                         u8 sgi;
 404                         u8 priority;
 405                         bool enable;
 406                         bool group;
 407                         bool clear;
 408                 } its_vsgi_cmd;
 409         };
 410 };
 411
 412 /*
 413  * The ITS command block, which is what the ITS actually parses.
 414  */
 415 struct its_cmd_block {
 416         union {
 417                 u64     raw_cmd[4];
 418                 __le64  raw_cmd_le[4];
 419         };
 420 };
 421
 422 #define ITS_CMD_QUEUE_SZ                SZ_64K
 423 #define ITS_CMD_QUEUE_NR_ENTRIES        (ITS_CMD_QUEUE_SZ / sizeof(struct its_cmd_block))
 424
 425 typedef struct its_collection *(*its_cmd_builder_t)(struct its_node *,
 426                                                     struct its_cmd_block *,
 427                                                     struct its_cmd_desc *);
 428
 429 typedef struct its_vpe *(*its_cmd_vbuilder_t)(struct its_node *,
 430                                               struct its_cmd_block *,
 431                                               struct its_cmd_desc *);
 432
 433 static void its_mask_encode(u64 *raw_cmd, u64 val, int h, int l)
 434 {
 435         u64 mask = GENMASK_ULL(h, l);
 436         *raw_cmd &= ~mask;
 437         *raw_cmd |= (val << l) & mask;
 438 }
 439
 440 static void its_encode_cmd(struct its_cmd_block *cmd, u8 cmd_nr)
 441 {
 442         its_mask_encode(&cmd->raw_cmd[0], cmd_nr, 7, 0);
 443 }
 444
 445 static void its_encode_devid(struct its_cmd_block *cmd, u32 devid)
 446 {
 447         its_mask_encode(&cmd->raw_cmd[0], devid, 63, 32);
 448 }
 449
 450 static void its_encode_event_id(struct its_cmd_block *cmd, u32 id)
 451 {
 452         its_mask_encode(&cmd->raw_cmd[1], id, 31, 0);
 453 }
 454
 455 static void its_encode_phys_id(struct its_cmd_block *cmd, u32 phys_id)
 456 {
 457         its_mask_encode(&cmd->raw_cmd[1], phys_id, 63, 32);
 458 }
 459
 460 static void its_encode_size(struct its_cmd_block *cmd, u8 size)
 461 {
 462         its_mask_encode(&cmd->raw_cmd[1], size, 4, 0);
 463 }
 464
 465 static void its_encode_itt(struct its_cmd_block *cmd, u64 itt_addr)
 466 {
 467         its_mask_encode(&cmd->raw_cmd[2], itt_addr >> 8, 51, 8);
 468 }
 469
 470 static void its_encode_valid(struct its_cmd_block *cmd, int valid)
 471 {
 472         its_mask_encode(&cmd->raw_cmd[2], !!valid, 63, 63);
 473 }
 474
 475 static void its_encode_target(struct its_cmd_block *cmd, u64 target_addr)
 476 {
 477         its_mask_encode(&cmd->raw_cmd[2], target_addr >> 16, 51, 16);
 478 }
 479
 480 static void its_encode_collection(struct its_cmd_block *cmd, u16 col)
 481 {
 482         its_mask_encode(&cmd->raw_cmd[2], col, 15, 0);
 483 }
 484
 485 static void its_encode_vpeid(struct its_cmd_block *cmd, u16 vpeid)
 486 {
 487         its_mask_encode(&cmd->raw_cmd[1], vpeid, 47, 32);
 488 }
 489
 490 static void its_encode_virt_id(struct its_cmd_block *cmd, u32 virt_id)
 491 {
 492         its_mask_encode(&cmd->raw_cmd[2], virt_id, 31, 0);
 493 }
 494
 495 static void its_encode_db_phys_id(struct its_cmd_block *cmd, u32 db_phys_id)
 496 {
 497         its_mask_encode(&cmd->raw_cmd[2], db_phys_id, 63, 32);
 498 }
 499
 500 static void its_encode_db_valid(struct its_cmd_block *cmd, bool db_valid)
 501 {
 502         its_mask_encode(&cmd->raw_cmd[2], db_valid, 0, 0);
 503 }
 504
 505 static void its_encode_seq_num(struct its_cmd_block *cmd, u16 seq_num)
 506 {
 507         its_mask_encode(&cmd->raw_cmd[0], seq_num, 47, 32);
 508 }
 509
 510 static void its_encode_its_list(struct its_cmd_block *cmd, u16 its_list)
 511 {
 512         its_mask_encode(&cmd->raw_cmd[1], its_list, 15, 0);
 513 }
 514
 515 static void its_encode_vpt_addr(struct its_cmd_block *cmd, u64 vpt_pa)
 516 {
 517         its_mask_encode(&cmd->raw_cmd[3], vpt_pa >> 16, 51, 16);
 518 }
 519
 520 static void its_encode_vpt_size(struct its_cmd_block *cmd, u8 vpt_size)
 521 {
 522         its_mask_encode(&cmd->raw_cmd[3], vpt_size, 4, 0);
 523 }
 524
 525 static void its_encode_vconf_addr(struct its_cmd_block *cmd, u64 vconf_pa)
 526 {
 527         its_mask_encode(&cmd->raw_cmd[0], vconf_pa >> 16, 51, 16);
 528 }
 529
 530 static void its_encode_alloc(struct its_cmd_block *cmd, bool alloc)
 531 {
 532         its_mask_encode(&cmd->raw_cmd[0], alloc, 8, 8);
 533 }
 534
 535 static void its_encode_ptz(struct its_cmd_block *cmd, bool ptz)
 536 {
 537         its_mask_encode(&cmd->raw_cmd[0], ptz, 9, 9);
 538 }
 539
 540 static void its_encode_vmapp_default_db(struct its_cmd_block *cmd,
 541                                         u32 vpe_db_lpi)
 542 {
 543         its_mask_encode(&cmd->raw_cmd[1], vpe_db_lpi, 31, 0);
 544 }
 545
 546 static void its_encode_vmovp_default_db(struct its_cmd_block *cmd,
 547                                         u32 vpe_db_lpi)
 548 {
 549         its_mask_encode(&cmd->raw_cmd[3], vpe_db_lpi, 31, 0);
 550 }
 551
 552 static void its_encode_db(struct its_cmd_block *cmd, bool db)
 553 {
 554         its_mask_encode(&cmd->raw_cmd[2], db, 63, 63);
 555 }
 556
 557 static void its_encode_sgi_intid(struct its_cmd_block *cmd, u8 sgi)
 558 {
 559         its_mask_encode(&cmd->raw_cmd[0], sgi, 35, 32);
 560 }
 561
 562 static void its_encode_sgi_priority(struct its_cmd_block *cmd, u8 prio)
 563 {
 564         its_mask_encode(&cmd->raw_cmd[0], prio >> 4, 23, 20);
 565 }
 566
 567 static void its_encode_sgi_group(struct its_cmd_block *cmd, bool grp)
 568 {
 569         its_mask_encode(&cmd->raw_cmd[0], grp, 10, 10);
 570 }
 571
 572 static void its_encode_sgi_clear(struct its_cmd_block *cmd, bool clr)
 573 {
 574         its_mask_encode(&cmd->raw_cmd[0], clr, 9, 9);
 575 }
 576
 577 static void its_encode_sgi_enable(struct its_cmd_block *cmd, bool en)
 578 {
 579         its_mask_encode(&cmd->raw_cmd[0], en, 8, 8);
 580 }
 581
 582 static inline void its_fixup_cmd(struct its_cmd_block *cmd)
 583 {
 584         /* Let's fixup BE commands */
 585         cmd->raw_cmd_le[0] = cpu_to_le64(cmd->raw_cmd[0]);
 586         cmd->raw_cmd_le[1] = cpu_to_le64(cmd->raw_cmd[1]);
 587         cmd->raw_cmd_le[2] = cpu_to_le64(cmd->raw_cmd[2]);
 588         cmd->raw_cmd_le[3] = cpu_to_le64(cmd->raw_cmd[3]);
 589 }
 590
 591 static struct its_collection *its_build_mapd_cmd(struct its_node *its,
 592                                                  struct its_cmd_block *cmd,
 593                                                  struct its_cmd_desc *desc)
 594 {
 595         unsigned long itt_addr;
 596         u8 size = ilog2(desc->its_mapd_cmd.dev->nr_ites);
 597
 598         itt_addr = virt_to_phys(desc->its_mapd_cmd.dev->itt);
 599         itt_addr = ALIGN(itt_addr, ITS_ITT_ALIGN);
 600
 601         its_encode_cmd(cmd, GITS_CMD_MAPD);
 602         its_encode_devid(cmd, desc->its_mapd_cmd.dev->device_id);
 603         its_encode_size(cmd, size - 1);
 604         its_encode_itt(cmd, itt_addr);
 605         its_encode_valid(cmd, desc->its_mapd_cmd.valid);
 606
 607         its_fixup_cmd(cmd);
 608
 609         return NULL;
 610 }
 611
 612 static struct its_collection *its_build_mapc_cmd(struct its_node *its,
 613                                                  struct its_cmd_block *cmd,
 614                                                  struct its_cmd_desc *desc)
 615 {
 616         its_encode_cmd(cmd, GITS_CMD_MAPC);
 617         its_encode_collection(cmd, desc->its_mapc_cmd.col->col_id);
 618         its_encode_target(cmd, desc->its_mapc_cmd.col->target_address);
 619         its_encode_valid(cmd, desc->its_mapc_cmd.valid);
 620
 621         its_fixup_cmd(cmd);
 622
 623         return desc->its_mapc_cmd.col;
 624 }
 625
 626 static struct its_collection *its_build_mapti_cmd(struct its_node *its,
 627                                                   struct its_cmd_block *cmd,
 628                                                   struct its_cmd_desc *desc)
 629 {
 630         struct its_collection *col;
 631
 632         col = dev_event_to_col(desc->its_mapti_cmd.dev,
 633                                desc->its_mapti_cmd.event_id);
 634
 635         its_encode_cmd(cmd, GITS_CMD_MAPTI);
 636         its_encode_devid(cmd, desc->its_mapti_cmd.dev->device_id);
 637         its_encode_event_id(cmd, desc->its_mapti_cmd.event_id);
 638         its_encode_phys_id(cmd, desc->its_mapti_cmd.phys_id);
 639         its_encode_collection(cmd, col->col_id);
 640
 641         its_fixup_cmd(cmd);
 642
 643         return valid_col(col);
 644 }
 645
 646 static struct its_collection *its_build_movi_cmd(struct its_node *its,
 647                                                  struct its_cmd_block *cmd,
 648                                                  struct its_cmd_desc *desc)
 649 {
 650         struct its_collection *col;
 651
 652         col = dev_event_to_col(desc->its_movi_cmd.dev,
 653                                desc->its_movi_cmd.event_id);
 654
 655         its_encode_cmd(cmd, GITS_CMD_MOVI);
 656         its_encode_devid(cmd, desc->its_movi_cmd.dev->device_id);
 657         its_encode_event_id(cmd, desc->its_movi_cmd.event_id);
 658         its_encode_collection(cmd, desc->its_movi_cmd.col->col_id);
 659
 660         its_fixup_cmd(cmd);
 661
 662         return valid_col(col);
 663 }
 664
 665 static struct its_collection *its_build_discard_cmd(struct its_node *its,
 666                                                     struct its_cmd_block *cmd,
 667                                                     struct its_cmd_desc *desc)
 668 {
 669         struct its_collection *col;
 670
 671         col = dev_event_to_col(desc->its_discard_cmd.dev,
 672                                desc->its_discard_cmd.event_id);
 673
 674         its_encode_cmd(cmd, GITS_CMD_DISCARD);
 675         its_encode_devid(cmd, desc->its_discard_cmd.dev->device_id);
 676         its_encode_event_id(cmd, desc->its_discard_cmd.event_id);
 677
 678         its_fixup_cmd(cmd);
 679
 680         return valid_col(col);
 681 }
 682
 683 static struct its_collection *its_build_inv_cmd(struct its_node *its,
 684                                                 struct its_cmd_block *cmd,
 685                                                 struct its_cmd_desc *desc)
 686 {
 687         struct its_collection *col;
 688
 689         col = dev_event_to_col(desc->its_inv_cmd.dev,
 690                                desc->its_inv_cmd.event_id);
 691
 692         its_encode_cmd(cmd, GITS_CMD_INV);
 693         its_encode_devid(cmd, desc->its_inv_cmd.dev->device_id);
 694         its_encode_event_id(cmd, desc->its_inv_cmd.event_id);
 695
 696         its_fixup_cmd(cmd);
 697
 698         return valid_col(col);
 699 }
 700
 701 static struct its_collection *its_build_int_cmd(struct its_node *its,
 702                                                 struct its_cmd_block *cmd,
 703                                                 struct its_cmd_desc *desc)
 704 {
 705         struct its_collection *col;
 706
 707         col = dev_event_to_col(desc->its_int_cmd.dev,
 708                                desc->its_int_cmd.event_id);
 709
 710         its_encode_cmd(cmd, GITS_CMD_INT);
 711         its_encode_devid(cmd, desc->its_int_cmd.dev->device_id);
 712         its_encode_event_id(cmd, desc->its_int_cmd.event_id);
 713
 714         its_fixup_cmd(cmd);
 715
 716         return valid_col(col);
 717 }
 718
 719 static struct its_collection *its_build_clear_cmd(struct its_node *its,
 720                                                   struct its_cmd_block *cmd,
 721                                                   struct its_cmd_desc *desc)
 722 {
 723         struct its_collection *col;
 724
 725         col = dev_event_to_col(desc->its_clear_cmd.dev,
 726                                desc->its_clear_cmd.event_id);
 727
 728         its_encode_cmd(cmd, GITS_CMD_CLEAR);
 729         its_encode_devid(cmd, desc->its_clear_cmd.dev->device_id);
 730         its_encode_event_id(cmd, desc->its_clear_cmd.event_id);
 731
 732         its_fixup_cmd(cmd);
 733
 734         return valid_col(col);
 735 }
 736
 737 static struct its_collection *its_build_invall_cmd(struct its_node *its,
 738                                                    struct its_cmd_block *cmd,
 739                                                    struct its_cmd_desc *desc)
 740 {
 741         its_encode_cmd(cmd, GITS_CMD_INVALL);
 742         its_encode_collection(cmd, desc->its_invall_cmd.col->col_id);
 743
 744         its_fixup_cmd(cmd);
 745
 746         return NULL;
 747 }
 748
 749 static struct its_vpe *its_build_vinvall_cmd(struct its_node *its,
 750                                              struct its_cmd_block *cmd,
 751                                              struct its_cmd_desc *desc)
 752 {
 753         its_encode_cmd(cmd, GITS_CMD_VINVALL);
 754         its_encode_vpeid(cmd, desc->its_vinvall_cmd.vpe->vpe_id);
 755
 756         its_fixup_cmd(cmd);
 757
 758         return valid_vpe(its, desc->its_vinvall_cmd.vpe);
 759 }
 760
 761 static struct its_vpe *its_build_vmapp_cmd(struct its_node *its,
 762                                            struct its_cmd_block *cmd,
 763                                            struct its_cmd_desc *desc)
 764 {
 765         unsigned long vpt_addr, vconf_addr;
 766         u64 target;
 767         bool alloc;
 768
 769         its_encode_cmd(cmd, GITS_CMD_VMAPP);
 770         its_encode_vpeid(cmd, desc->its_vmapp_cmd.vpe->vpe_id);
 771         its_encode_valid(cmd, desc->its_vmapp_cmd.valid);
 772
 773         if (!desc->its_vmapp_cmd.valid) {
 774                 if (is_v4_1(its)) {
 775                         alloc = !atomic_dec_return(&desc->its_vmapp_cmd.vpe->vmapp_count);
 776                         its_encode_alloc(cmd, alloc);
 777                 }
 778
 779                 goto out;
 780         }
 781
 782         vpt_addr = virt_to_phys(page_address(desc->its_vmapp_cmd.vpe->vpt_page));
 783         target = desc->its_vmapp_cmd.col->target_address + its->vlpi_redist_offset;
 784
 785         its_encode_target(cmd, target);
 786         its_encode_vpt_addr(cmd, vpt_addr);
 787         its_encode_vpt_size(cmd, LPI_NRBITS - 1);
 788
 789         if (!is_v4_1(its))
 790                 goto out;
 791
 792         vconf_addr = virt_to_phys(page_address(desc->its_vmapp_cmd.vpe->its_vm->vprop_page));
 793
 794         alloc = !atomic_fetch_inc(&desc->its_vmapp_cmd.vpe->vmapp_count);
 795
 796         its_encode_alloc(cmd, alloc);
 797
 798         /* We can only signal PTZ when alloc==1. Why do we have two bits? */
 799         its_encode_ptz(cmd, alloc);
 800         its_encode_vconf_addr(cmd, vconf_addr);
 801         its_encode_vmapp_default_db(cmd, desc->its_vmapp_cmd.vpe->vpe_db_lpi);
 802
 803 out:
 804         its_fixup_cmd(cmd);
 805
 806         return valid_vpe(its, desc->its_vmapp_cmd.vpe);
 807 }
 808
 809 static struct its_vpe *its_build_vmapti_cmd(struct its_node *its,
 810                                             struct its_cmd_block *cmd,
 811                                             struct its_cmd_desc *desc)
 812 {
 813         u32 db;
 814
 815         if (!is_v4_1(its) && desc->its_vmapti_cmd.db_enabled)
 816                 db = desc->its_vmapti_cmd.vpe->vpe_db_lpi;
 817         else
 818                 db = 1023;
 819
 820         its_encode_cmd(cmd, GITS_CMD_VMAPTI);
 821         its_encode_devid(cmd, desc->its_vmapti_cmd.dev->device_id);
 822         its_encode_vpeid(cmd, desc->its_vmapti_cmd.vpe->vpe_id);
 823         its_encode_event_id(cmd, desc->its_vmapti_cmd.event_id);
 824         its_encode_db_phys_id(cmd, db);
 825         its_encode_virt_id(cmd, desc->its_vmapti_cmd.virt_id);
 826
 827         its_fixup_cmd(cmd);
 828
 829         return valid_vpe(its, desc->its_vmapti_cmd.vpe);
 830 }
 831
 832 static struct its_vpe *its_build_vmovi_cmd(struct its_node *its,
 833                                            struct its_cmd_block *cmd,
 834                                            struct its_cmd_desc *desc)
 835 {
 836         u32 db;
 837
 838         if (!is_v4_1(its) && desc->its_vmovi_cmd.db_enabled)
 839                 db = desc->its_vmovi_cmd.vpe->vpe_db_lpi;
 840         else
 841                 db = 1023;
 842
 843         its_encode_cmd(cmd, GITS_CMD_VMOVI);
 844         its_encode_devid(cmd, desc->its_vmovi_cmd.dev->device_id);
 845         its_encode_vpeid(cmd, desc->its_vmovi_cmd.vpe->vpe_id);
 846         its_encode_event_id(cmd, desc->its_vmovi_cmd.event_id);
 847         its_encode_db_phys_id(cmd, db);
 848         its_encode_db_valid(cmd, true);
 849
 850         its_fixup_cmd(cmd);
 851
 852         return valid_vpe(its, desc->its_vmovi_cmd.vpe);
 853 }
 854
 855 static struct its_vpe *its_build_vmovp_cmd(struct its_node *its,
 856                                            struct its_cmd_block *cmd,
 857                                            struct its_cmd_desc *desc)
 858 {
 859         u64 target;
 860
 861         target = desc->its_vmovp_cmd.col->target_address + its->vlpi_redist_offset;
 862         its_encode_cmd(cmd, GITS_CMD_VMOVP);
 863         its_encode_seq_num(cmd, desc->its_vmovp_cmd.seq_num);
 864         its_encode_its_list(cmd, desc->its_vmovp_cmd.its_list);
 865         its_encode_vpeid(cmd, desc->its_vmovp_cmd.vpe->vpe_id);
 866         its_encode_target(cmd, target);
 867
 868         if (is_v4_1(its)) {
 869                 its_encode_db(cmd, true);
 870                 its_encode_vmovp_default_db(cmd, desc->its_vmovp_cmd.vpe->vpe_db_lpi);
 871         }
 872
 873         its_fixup_cmd(cmd);
 874
 875         return valid_vpe(its, desc->its_vmovp_cmd.vpe);
 876 }
 877
 878 static struct its_vpe *its_build_vinv_cmd(struct its_node *its,
 879                                           struct its_cmd_block *cmd,
 880                                           struct its_cmd_desc *desc)
 881 {
 882         struct its_vlpi_map *map;
 883
 884         map = dev_event_to_vlpi_map(desc->its_inv_cmd.dev,
 885                                     desc->its_inv_cmd.event_id);
 886
 887         its_encode_cmd(cmd, GITS_CMD_INV);
 888         its_encode_devid(cmd, desc->its_inv_cmd.dev->device_id);
 889         its_encode_event_id(cmd, desc->its_inv_cmd.event_id);
 890
 891         its_fixup_cmd(cmd);
 892
 893         return valid_vpe(its, map->vpe);
 894 }
 895
 896 static struct its_vpe *its_build_vint_cmd(struct its_node *its,
 897                                           struct its_cmd_block *cmd,
 898                                           struct its_cmd_desc *desc)
 899 {
 900         struct its_vlpi_map *map;
 901
 902         map = dev_event_to_vlpi_map(desc->its_int_cmd.dev,
 903                                     desc->its_int_cmd.event_id);
 904
 905         its_encode_cmd(cmd, GITS_CMD_INT);
 906         its_encode_devid(cmd, desc->its_int_cmd.dev->device_id);
 907         its_encode_event_id(cmd, desc->its_int_cmd.event_id);
 908
 909         its_fixup_cmd(cmd);
 910
 911         return valid_vpe(its, map->vpe);
 912 }
 913
 914 static struct its_vpe *its_build_vclear_cmd(struct its_node *its,
 915                                             struct its_cmd_block *cmd,
 916                                             struct its_cmd_desc *desc)
 917 {
 918         struct its_vlpi_map *map;
 919
 920         map = dev_event_to_vlpi_map(desc->its_clear_cmd.dev,
 921                                     desc->its_clear_cmd.event_id);
 922
 923         its_encode_cmd(cmd, GITS_CMD_CLEAR);
 924         its_encode_devid(cmd, desc->its_clear_cmd.dev->device_id);
 925         its_encode_event_id(cmd, desc->its_clear_cmd.event_id);
 926
 927         its_fixup_cmd(cmd);
 928
 929         return valid_vpe(its, map->vpe);
 930 }
 931
 932 static struct its_vpe *its_build_invdb_cmd(struct its_node *its,
 933                                            struct its_cmd_block *cmd,
 934                                            struct its_cmd_desc *desc)
 935 {
 936         if (WARN_ON(!is_v4_1(its)))
 937                 return NULL;
 938
 939         its_encode_cmd(cmd, GITS_CMD_INVDB);
 940         its_encode_vpeid(cmd, desc->its_invdb_cmd.vpe->vpe_id);
 941
 942         its_fixup_cmd(cmd);
 943
 944         return valid_vpe(its, desc->its_invdb_cmd.vpe);
 945 }
 946
 947 static struct its_vpe *its_build_vsgi_cmd(struct its_node *its,
 948                                           struct its_cmd_block *cmd,
 949                                           struct its_cmd_desc *desc)
 950 {
 951         if (WARN_ON(!is_v4_1(its)))
 952                 return NULL;
 953
 954         its_encode_cmd(cmd, GITS_CMD_VSGI);
 955         its_encode_vpeid(cmd, desc->its_vsgi_cmd.vpe->vpe_id);
 956         its_encode_sgi_intid(cmd, desc->its_vsgi_cmd.sgi);
 957         its_encode_sgi_priority(cmd, desc->its_vsgi_cmd.priority);
 958         its_encode_sgi_group(cmd, desc->its_vsgi_cmd.group);
 959         its_encode_sgi_clear(cmd, desc->its_vsgi_cmd.clear);
 960         its_encode_sgi_enable(cmd, desc->its_vsgi_cmd.enable);
 961
 962         its_fixup_cmd(cmd);
 963
 964         return valid_vpe(its, desc->its_vsgi_cmd.vpe);
 965 }
 966
 967 static u64 its_cmd_ptr_to_offset(struct its_node *its,
 968                                  struct its_cmd_block *ptr)
 969 {
 970         return (ptr - its->cmd_base) * sizeof(*ptr);
 971 }
 972
 973 static int its_queue_full(struct its_node *its)
 974 {
 975         int widx;
 976         int ridx;
 977
 978         widx = its->cmd_write - its->cmd_base;
 979         ridx = readl_relaxed(its->base + GITS_CREADR) / sizeof(struct its_cmd_block);
 980
 981         /* This is incredibly unlikely to happen, unless the ITS locks up. */
 982         if (((widx + 1) % ITS_CMD_QUEUE_NR_ENTRIES) == ridx)
 983                 return 1;
 984
 985         return 0;
 986 }
 987
 988 static struct its_cmd_block *its_allocate_entry(struct its_node *its)
 989 {
 990         struct its_cmd_block *cmd;
 991         u32 count = 1000000;    /* 1s! */
 992
 993         while (its_queue_full(its)) {
 994                 count--;
 995                 if (!count) {
 996                         pr_err_ratelimited("ITS queue not draining\n");
 997                         return NULL;
 998                 }
 999                 cpu_relax();
1000                 udelay(1);
1001         }
1002
1003         cmd = its->cmd_write++;
1004
1005         /* Handle queue wrapping */
1006         if (its->cmd_write == (its->cmd_base + ITS_CMD_QUEUE_NR_ENTRIES))
1007                 its->cmd_write = its->cmd_base;
1008
1009         /* Clear command  */
1010         cmd->raw_cmd[0] = 0;
1011         cmd->raw_cmd[1] = 0;
1012         cmd->raw_cmd[2] = 0;
1013         cmd->raw_cmd[3] = 0;
1014
1015         return cmd;
1016 }
1017
1018 static struct its_cmd_block *its_post_commands(struct its_node *its)
1019 {
1020         u64 wr = its_cmd_ptr_to_offset(its, its->cmd_write);
1021
1022         writel_relaxed(wr, its->base + GITS_CWRITER);
1023
1024         return its->cmd_write;
1025 }
1026
1027 static void its_flush_cmd(struct its_node *its, struct its_cmd_block *cmd)
1028 {
1029         /*
1030          * Make sure the commands written to memory are observable by
1031          * the ITS.
1032          */
1033         if (its->flags & ITS_FLAGS_CMDQ_NEEDS_FLUSHING)
1034                 gic_flush_dcache_to_poc(cmd, sizeof(*cmd));
1035         else
1036                 dsb(ishst);
1037 }
1038
1039 static int its_wait_for_range_completion(struct its_node *its,
1040                                          u64    prev_idx,
1041                                          struct its_cmd_block *to)
1042 {
1043         u64 rd_idx, to_idx, linear_idx;
1044         u32 count = 1000000;    /* 1s! */
1045
1046         /* Linearize to_idx if the command set has wrapped around */
1047         to_idx = its_cmd_ptr_to_offset(its, to);
1048         if (to_idx < prev_idx)
1049                 to_idx += ITS_CMD_QUEUE_SZ;
1050
1051         linear_idx = prev_idx;
1052
1053         while (1) {
1054                 s64 delta;
1055
1056                 rd_idx = readl_relaxed(its->base + GITS_CREADR);
1057
1058                 /*
1059                  * Compute the read pointer progress, taking the
1060                  * potential wrap-around into account.
1061                  */
1062                 delta = rd_idx - prev_idx;
1063                 if (rd_idx < prev_idx)
1064                         delta += ITS_CMD_QUEUE_SZ;
1065
1066                 linear_idx += delta;
1067                 if (linear_idx >= to_idx)
1068                         break;
1069
1070                 count--;
1071                 if (!count) {
1072                         pr_err_ratelimited("ITS queue timeout (%llu %llu)\n",
1073                                            to_idx, linear_idx);
1074                         return -1;
1075                 }
1076                 prev_idx = rd_idx;
1077                 cpu_relax();
1078                 udelay(1);
1079         }
1080
1081         return 0;
1082 }
1083
1084 /* Warning, macro hell follows */
1085 #define BUILD_SINGLE_CMD_FUNC(name, buildtype, synctype, buildfn)       \
1086 void name(struct its_node *its,                                         \
1087           buildtype builder,                                            \
1088           struct its_cmd_desc *desc)                                    \
1089 {                                                                       \
1090         struct its_cmd_block *cmd, *sync_cmd, *next_cmd;                \
1091         synctype *sync_obj;                                             \
1092         unsigned long flags;                                            \
1093         u64 rd_idx;                                                     \
1094                                                                         \
1095         raw_spin_lock_irqsave(&its->lock, flags);                       \
1096                                                                         \
1097         cmd = its_allocate_entry(its);                                  \
1098         if (!cmd) {             /* We're soooooo screewed... */         \
1099                 raw_spin_unlock_irqrestore(&its->lock, flags);          \
1100                 return;                                                 \
1101         }                                                               \
1102         sync_obj = builder(its, cmd, desc);                             \
1103         its_flush_cmd(its, cmd);                                        \
1104                                                                         \
1105         if (sync_obj) {                                                 \
1106                 sync_cmd = its_allocate_entry(its);                     \
1107                 if (!sync_cmd)                                          \
1108                         goto post;                                      \
1109                                                                         \
1110                 buildfn(its, sync_cmd, sync_obj);                       \
1111                 its_flush_cmd(its, sync_cmd);                           \
1112         }                                                               \
1113                                                                         \
1114 post:                                                                   \
1115         rd_idx = readl_relaxed(its->base + GITS_CREADR);                \
1116         next_cmd = its_post_commands(its);                              \
1117         raw_spin_unlock_irqrestore(&its->lock, flags);                  \
1118                                                                         \
1119         if (its_wait_for_range_completion(its, rd_idx, next_cmd))       \
1120                 pr_err_ratelimited("ITS cmd %ps failed\n", builder);    \
1121 }
1122
1123 static void its_build_sync_cmd(struct its_node *its,
1124                                struct its_cmd_block *sync_cmd,
1125                                struct its_collection *sync_col)
1126 {
1127         its_encode_cmd(sync_cmd, GITS_CMD_SYNC);
1128         its_encode_target(sync_cmd, sync_col->target_address);
1129
1130         its_fixup_cmd(sync_cmd);
1131 }
1132
1133 static BUILD_SINGLE_CMD_FUNC(its_send_single_command, its_cmd_builder_t,
1134                              struct its_collection, its_build_sync_cmd)
1135
1136 static void its_build_vsync_cmd(struct its_node *its,
1137                                 struct its_cmd_block *sync_cmd,
1138                                 struct its_vpe *sync_vpe)
1139 {
1140         its_encode_cmd(sync_cmd, GITS_CMD_VSYNC);
1141         its_encode_vpeid(sync_cmd, sync_vpe->vpe_id);
1142
1143         its_fixup_cmd(sync_cmd);
1144 }
1145
1146 static BUILD_SINGLE_CMD_FUNC(its_send_single_vcommand, its_cmd_vbuilder_t,
1147                              struct its_vpe, its_build_vsync_cmd)
1148
1149 static void its_send_int(struct its_device *dev, u32 event_id)
1150 {
1151         struct its_cmd_desc desc;
1152
1153         desc.its_int_cmd.dev = dev;
1154         desc.its_int_cmd.event_id = event_id;
1155
1156         its_send_single_command(dev->its, its_build_int_cmd, &desc);
1157 }
1158
1159 static void its_send_clear(struct its_device *dev, u32 event_id)
1160 {
1161         struct its_cmd_desc desc;
1162
1163         desc.its_clear_cmd.dev = dev;
1164         desc.its_clear_cmd.event_id = event_id;
1165
1166         its_send_single_command(dev->its, its_build_clear_cmd, &desc);
1167 }
1168
1169 static void its_send_inv(struct its_device *dev, u32 event_id)
1170 {
1171         struct its_cmd_desc desc;
1172
1173         desc.its_inv_cmd.dev = dev;
1174         desc.its_inv_cmd.event_id = event_id;
1175
1176         its_send_single_command(dev->its, its_build_inv_cmd, &desc);
1177 }
1178
1179 static void its_send_mapd(struct its_device *dev, int valid)
1180 {
1181         struct its_cmd_desc desc;
1182
1183         desc.its_mapd_cmd.dev = dev;
1184         desc.its_mapd_cmd.valid = !!valid;
1185
1186         its_send_single_command(dev->its, its_build_mapd_cmd, &desc);
1187 }
1188
1189 static void its_send_mapc(struct its_node *its, struct its_collection *col,
1190                           int valid)
1191 {
1192         struct its_cmd_desc desc;
1193
1194         desc.its_mapc_cmd.col = col;
1195         desc.its_mapc_cmd.valid = !!valid;
1196
1197         its_send_single_command(its, its_build_mapc_cmd, &desc);
1198 }
1199
1200 static void its_send_mapti(struct its_device *dev, u32 irq_id, u32 id)
1201 {
1202         struct its_cmd_desc desc;
1203
1204         desc.its_mapti_cmd.dev = dev;
1205         desc.its_mapti_cmd.phys_id = irq_id;
1206         desc.its_mapti_cmd.event_id = id;
1207
1208         its_send_single_command(dev->its, its_build_mapti_cmd, &desc);
1209 }
1210
1211 static void its_send_movi(struct its_device *dev,
1212                           struct its_collection *col, u32 id)
1213 {
1214         struct its_cmd_desc desc;
1215
1216         desc.its_movi_cmd.dev = dev;
1217         desc.its_movi_cmd.col = col;
1218         desc.its_movi_cmd.event_id = id;
1219
1220         its_send_single_command(dev->its, its_build_movi_cmd, &desc);
1221 }
1222
1223 static void its_send_discard(struct its_device *dev, u32 id)
1224 {
1225         struct its_cmd_desc desc;
1226
1227         desc.its_discard_cmd.dev = dev;
1228         desc.its_discard_cmd.event_id = id;
1229
1230         its_send_single_command(dev->its, its_build_discard_cmd, &desc);
1231 }
1232
1233 static void its_send_invall(struct its_node *its, struct its_collection *col)
1234 {
1235         struct its_cmd_desc desc;
1236
1237         desc.its_invall_cmd.col = col;
1238
1239         its_send_single_command(its, its_build_invall_cmd, &desc);
1240 }
1241
1242 static void its_send_vmapti(struct its_device *dev, u32 id)
1243 {
1244         struct its_vlpi_map *map = dev_event_to_vlpi_map(dev, id);
1245         struct its_cmd_desc desc;
1246
1247         desc.its_vmapti_cmd.vpe = map->vpe;
1248         desc.its_vmapti_cmd.dev = dev;
1249         desc.its_vmapti_cmd.virt_id = map->vintid;
1250         desc.its_vmapti_cmd.event_id = id;
1251         desc.its_vmapti_cmd.db_enabled = map->db_enabled;
1252
1253         its_send_single_vcommand(dev->its, its_build_vmapti_cmd, &desc);
1254 }
1255
1256 static void its_send_vmovi(struct its_device *dev, u32 id)
1257 {
1258         struct its_vlpi_map *map = dev_event_to_vlpi_map(dev, id);
1259         struct its_cmd_desc desc;
1260
1261         desc.its_vmovi_cmd.vpe = map->vpe;
1262         desc.its_vmovi_cmd.dev = dev;
1263         desc.its_vmovi_cmd.event_id = id;
1264         desc.its_vmovi_cmd.db_enabled = map->db_enabled;
1265
1266         its_send_single_vcommand(dev->its, its_build_vmovi_cmd, &desc);
1267 }
1268
1269 static void its_send_vmapp(struct its_node *its,
1270                            struct its_vpe *vpe, bool valid)
1271 {
1272         struct its_cmd_desc desc;
1273
1274         desc.its_vmapp_cmd.vpe = vpe;
1275         desc.its_vmapp_cmd.valid = valid;
1276         desc.its_vmapp_cmd.col = &its->collections[vpe->col_idx];
1277
1278         its_send_single_vcommand(its, its_build_vmapp_cmd, &desc);
1279 }
1280
1281 static void its_send_vmovp(struct its_vpe *vpe)
1282 {
1283         struct its_cmd_desc desc = {};
1284         struct its_node *its;
1285         unsigned long flags;
1286         int col_id = vpe->col_idx;
1287
1288         desc.its_vmovp_cmd.vpe = vpe;
1289
1290         if (!its_list_map) {
1291                 its = list_first_entry(&its_nodes, struct its_node, entry);
1292                 desc.its_vmovp_cmd.col = &its->collections[col_id];
1293                 its_send_single_vcommand(its, its_build_vmovp_cmd, &desc);
1294                 return;
1295         }
1296
1297         /*
1298          * Yet another marvel of the architecture. If using the
1299          * its_list "feature", we need to make sure that all ITSs
1300          * receive all VMOVP commands in the same order. The only way
1301          * to guarantee this is to make vmovp a serialization point.
1302          *
1303          * Wall <-- Head.
1304          */
1305         raw_spin_lock_irqsave(&vmovp_lock, flags);
1306
1307         desc.its_vmovp_cmd.seq_num = vmovp_seq_num++;
1308         desc.its_vmovp_cmd.its_list = get_its_list(vpe->its_vm);
1309
1310         /* Emit VMOVPs */
1311         list_for_each_entry(its, &its_nodes, entry) {
1312                 if (!is_v4(its))
1313                         continue;
1314
1315                 if (!require_its_list_vmovp(vpe->its_vm, its))
1316                         continue;
1317
1318                 desc.its_vmovp_cmd.col = &its->collections[col_id];
1319                 its_send_single_vcommand(its, its_build_vmovp_cmd, &desc);
1320         }
1321
1322         raw_spin_unlock_irqrestore(&vmovp_lock, flags);
1323 }
1324
1325 static void its_send_vinvall(struct its_node *its, struct its_vpe *vpe)
1326 {
1327         struct its_cmd_desc desc;
1328
1329         desc.its_vinvall_cmd.vpe = vpe;
1330         its_send_single_vcommand(its, its_build_vinvall_cmd, &desc);
1331 }
1332
1333 static void its_send_vinv(struct its_device *dev, u32 event_id)
1334 {
1335         struct its_cmd_desc desc;
1336
1337         /*
1338          * There is no real VINV command. This is just a normal INV,
1339          * with a VSYNC instead of a SYNC.
1340          */
1341         desc.its_inv_cmd.dev = dev;
1342         desc.its_inv_cmd.event_id = event_id;
1343
1344         its_send_single_vcommand(dev->its, its_build_vinv_cmd, &desc);
1345 }
1346
1347 static void its_send_vint(struct its_device *dev, u32 event_id)
1348 {
1349         struct its_cmd_desc desc;
1350
1351         /*
1352          * There is no real VINT command. This is just a normal INT,
1353          * with a VSYNC instead of a SYNC.
1354          */
1355         desc.its_int_cmd.dev = dev;
1356         desc.its_int_cmd.event_id = event_id;
1357
1358         its_send_single_vcommand(dev->its, its_build_vint_cmd, &desc);
1359 }
1360
1361 static void its_send_vclear(struct its_device *dev, u32 event_id)
1362 {
1363         struct its_cmd_desc desc;
1364
1365         /*
1366          * There is no real VCLEAR command. This is just a normal CLEAR,
1367          * with a VSYNC instead of a SYNC.
1368          */
1369         desc.its_clear_cmd.dev = dev;
1370         desc.its_clear_cmd.event_id = event_id;
1371
1372         its_send_single_vcommand(dev->its, its_build_vclear_cmd, &desc);
1373 }
1374
1375 static void its_send_invdb(struct its_node *its, struct its_vpe *vpe)
1376 {
1377         struct its_cmd_desc desc;
1378
1379         desc.its_invdb_cmd.vpe = vpe;
1380         its_send_single_vcommand(its, its_build_invdb_cmd, &desc);
1381 }
1382
1383 /*
1384  * irqchip functions - assumes MSI, mostly.
1385  */
1386 static void lpi_write_config(struct irq_data *d, u8 clr, u8 set)
1387 {
1388         struct its_vlpi_map *map = get_vlpi_map(d);
1389         irq_hw_number_t hwirq;
1390         void *va;
1391         u8 *cfg;
1392
1393         if (map) {
1394                 va = page_address(map->vm->vprop_page);
1395                 hwirq = map->vintid;
1396
1397                 /* Remember the updated property */
1398                 map->properties &= ~clr;
1399                 map->properties |= set | LPI_PROP_GROUP1;
1400         } else {
1401                 va = gic_rdists->prop_table_va;
1402                 hwirq = d->hwirq;
1403         }
1404
1405         cfg = va + hwirq - 8192;
1406         *cfg &= ~clr;
1407         *cfg |= set | LPI_PROP_GROUP1;
1408
1409         /*
1410          * Make the above write visible to the redistributors.
1411          * And yes, we're flushing exactly: One. Single. Byte.
1412          * Humpf...
1413          */
1414         if (gic_rdists->flags & RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING)
1415                 gic_flush_dcache_to_poc(cfg, sizeof(*cfg));
1416         else
1417                 dsb(ishst);
1418 }
1419
1420 static void wait_for_syncr(void __iomem *rdbase)
1421 {
1422         while (readl_relaxed(rdbase + GICR_SYNCR) & 1)
1423                 cpu_relax();
1424 }
1425
1426 static void direct_lpi_inv(struct irq_data *d)
1427 {
1428         struct its_vlpi_map *map = get_vlpi_map(d);
1429         void __iomem *rdbase;
1430         unsigned long flags;
1431         u64 val;
1432         int cpu;
1433
1434         if (map) {
1435                 struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1436
1437                 WARN_ON(!is_v4_1(its_dev->its));
1438
1439                 val  = GICR_INVLPIR_V;
1440                 val |= FIELD_PREP(GICR_INVLPIR_VPEID, map->vpe->vpe_id);
1441                 val |= FIELD_PREP(GICR_INVLPIR_INTID, map->vintid);
1442         } else {
1443                 val = d->hwirq;
1444         }
1445
1446         /* Target the redistributor this LPI is currently routed to */
1447         cpu = irq_to_cpuid_lock(d, &flags);
1448         raw_spin_lock(&gic_data_rdist_cpu(cpu)->rd_lock);
1449         rdbase = per_cpu_ptr(gic_rdists->rdist, cpu)->rd_base;
1450         gic_write_lpir(val, rdbase + GICR_INVLPIR);
1451
1452         wait_for_syncr(rdbase);
1453         raw_spin_unlock(&gic_data_rdist_cpu(cpu)->rd_lock);
1454         irq_to_cpuid_unlock(d, flags);
1455 }
1456
1457 static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
1458 {
1459         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1460
1461         lpi_write_config(d, clr, set);
1462         if (gic_rdists->has_direct_lpi &&
1463             (is_v4_1(its_dev->its) || !irqd_is_forwarded_to_vcpu(d)))
1464                 direct_lpi_inv(d);
1465         else if (!irqd_is_forwarded_to_vcpu(d))
1466                 its_send_inv(its_dev, its_get_event_id(d));
1467         else
1468                 its_send_vinv(its_dev, its_get_event_id(d));
1469 }
1470
1471 static void its_vlpi_set_doorbell(struct irq_data *d, bool enable)
1472 {
1473         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1474         u32 event = its_get_event_id(d);
1475         struct its_vlpi_map *map;
1476
1477         /*
1478          * GICv4.1 does away with the per-LPI nonsense, nothing to do
1479          * here.
1480          */
1481         if (is_v4_1(its_dev->its))
1482                 return;
1483
1484         map = dev_event_to_vlpi_map(its_dev, event);
1485
1486         if (map->db_enabled == enable)
1487                 return;
1488
1489         map->db_enabled = enable;
1490
1491         /*
1492          * More fun with the architecture:
1493          *
1494          * Ideally, we'd issue a VMAPTI to set the doorbell to its LPI
1495          * value or to 1023, depending on the enable bit. But that
1496          * would be issueing a mapping for an /existing/ DevID+EventID
1497          * pair, which is UNPREDICTABLE. Instead, let's issue a VMOVI
1498          * to the /same/ vPE, using this opportunity to adjust the
1499          * doorbell. Mouahahahaha. We loves it, Precious.
1500          */
1501         its_send_vmovi(its_dev, event);
1502 }
1503
1504 static void its_mask_irq(struct irq_data *d)
1505 {
1506         if (irqd_is_forwarded_to_vcpu(d))
1507                 its_vlpi_set_doorbell(d, false);
1508
1509         lpi_update_config(d, LPI_PROP_ENABLED, 0);
1510 }
1511
1512 static void its_unmask_irq(struct irq_data *d)
1513 {
1514         if (irqd_is_forwarded_to_vcpu(d))
1515                 its_vlpi_set_doorbell(d, true);
1516
1517         lpi_update_config(d, 0, LPI_PROP_ENABLED);
1518 }
1519
1520 static __maybe_unused u32 its_read_lpi_count(struct irq_data *d, int cpu)
1521 {
1522         if (irqd_affinity_is_managed(d))
1523                 return atomic_read(&per_cpu_ptr(&cpu_lpi_count, cpu)->managed);
1524
1525         return atomic_read(&per_cpu_ptr(&cpu_lpi_count, cpu)->unmanaged);
1526 }
1527
1528 static void its_inc_lpi_count(struct irq_data *d, int cpu)
1529 {
1530         if (irqd_affinity_is_managed(d))
1531                 atomic_inc(&per_cpu_ptr(&cpu_lpi_count, cpu)->managed);
1532         else
1533                 atomic_inc(&per_cpu_ptr(&cpu_lpi_count, cpu)->unmanaged);
1534 }
1535
1536 static void its_dec_lpi_count(struct irq_data *d, int cpu)
1537 {
1538         if (irqd_affinity_is_managed(d))
1539                 atomic_dec(&per_cpu_ptr(&cpu_lpi_count, cpu)->managed);
1540         else
1541                 atomic_dec(&per_cpu_ptr(&cpu_lpi_count, cpu)->unmanaged);
1542 }
1543
1544 static unsigned int cpumask_pick_least_loaded(struct irq_data *d,
1545                                               const struct cpumask *cpu_mask)
1546 {
1547         unsigned int cpu = nr_cpu_ids, tmp;
1548         int count = S32_MAX;
1549
1550         for_each_cpu(tmp, cpu_mask) {
1551                 int this_count = its_read_lpi_count(d, tmp);
1552                 if (this_count < count) {
1553                         cpu = tmp;
1554                         count = this_count;
1555                 }
1556         }
1557
1558         return cpu;
1559 }
1560
1561 /*
1562  * As suggested by Thomas Gleixner in:
1563  * https://lore.kernel.org/r/87h80q2aoc.fsf@nanos.tec.linutronix.de
1564  */
1565 static int its_select_cpu(struct irq_data *d,
1566                           const struct cpumask *aff_mask)
1567 {
1568         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1569         cpumask_var_t tmpmask;
1570         int cpu, node;
1571
1572         if (!alloc_cpumask_var(&tmpmask, GFP_ATOMIC))
1573                 return -ENOMEM;
1574
1575         node = its_dev->its->numa_node;
1576
1577         if (!irqd_affinity_is_managed(d)) {
1578                 /* First try the NUMA node */
1579                 if (node != NUMA_NO_NODE) {
1580                         /*
1581                          * Try the intersection of the affinity mask and the
1582                          * node mask (and the online mask, just to be safe).
1583                          */
1584                         cpumask_and(tmpmask, cpumask_of_node(node), aff_mask);
1585                         cpumask_and(tmpmask, tmpmask, cpu_online_mask);
1586
1587                         /*
1588                          * Ideally, we would check if the mask is empty, and
1589                          * try again on the full node here.
1590                          *
1591                          * But it turns out that the way ACPI describes the
1592                          * affinity for ITSs only deals about memory, and
1593                          * not target CPUs, so it cannot describe a single
1594                          * ITS placed next to two NUMA nodes.
1595                          *
1596                          * Instead, just fallback on the online mask. This
1597                          * diverges from Thomas' suggestion above.
1598                          */
1599                         cpu = cpumask_pick_least_loaded(d, tmpmask);
1600                         if (cpu < nr_cpu_ids)
1601                                 goto out;
1602
1603                         /* If we can't cross sockets, give up */
1604                         if ((its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144))
1605                                 goto out;
1606
1607                         /* If the above failed, expand the search */
1608                 }
1609
1610                 /* Try the intersection of the affinity and online masks */
1611                 cpumask_and(tmpmask, aff_mask, cpu_online_mask);
1612
1613                 /* If that doesn't fly, the online mask is the last resort */
1614                 if (cpumask_empty(tmpmask))
1615                         cpumask_copy(tmpmask, cpu_online_mask);
1616
1617                 cpu = cpumask_pick_least_loaded(d, tmpmask);
1618         } else {
1619                 cpumask_and(tmpmask, irq_data_get_affinity_mask(d), cpu_online_mask);
1620
1621                 /* If we cannot cross sockets, limit the search to that node */
1622                 if ((its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) &&
1623                     node != NUMA_NO_NODE)
1624                         cpumask_and(tmpmask, tmpmask, cpumask_of_node(node));
1625
1626                 cpu = cpumask_pick_least_loaded(d, tmpmask);
1627         }
1628 out:
1629         free_cpumask_var(tmpmask);
1630
1631         pr_debug("IRQ%d -> %*pbl CPU%d\n", d->irq, cpumask_pr_args(aff_mask), cpu);
1632         return cpu;
1633 }
1634
1635 static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
1636                             bool force)
1637 {
1638         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1639         struct its_collection *target_col;
1640         u32 id = its_get_event_id(d);
1641         int cpu, prev_cpu;
1642
1643         /* A forwarded interrupt should use irq_set_vcpu_affinity */
1644         if (irqd_is_forwarded_to_vcpu(d))
1645                 return -EINVAL;
1646
1647         prev_cpu = its_dev->event_map.col_map[id];
1648         its_dec_lpi_count(d, prev_cpu);
1649
1650         if (!force)
1651                 cpu = its_select_cpu(d, mask_val);
1652         else
1653                 cpu = cpumask_pick_least_loaded(d, mask_val);
1654
1655         if (cpu < 0 || cpu >= nr_cpu_ids)
1656                 goto err;
1657
1658         /* don't set the affinity when the target cpu is same as current one */
1659         if (cpu != prev_cpu) {
1660                 target_col = &its_dev->its->collections[cpu];
1661                 its_send_movi(its_dev, target_col, id);
1662                 its_dev->event_map.col_map[id] = cpu;
1663                 irq_data_update_effective_affinity(d, cpumask_of(cpu));
1664         }
1665
1666         its_inc_lpi_count(d, cpu);
1667
1668         return IRQ_SET_MASK_OK_DONE;
1669
1670 err:
1671         its_inc_lpi_count(d, prev_cpu);
1672         return -EINVAL;
1673 }
1674
1675 static u64 its_irq_get_msi_base(struct its_device *its_dev)
1676 {
1677         struct its_node *its = its_dev->its;
1678
1679         return its->phys_base + GITS_TRANSLATER;
1680 }
1681
1682 static void its_irq_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
1683 {
1684         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1685         struct its_node *its;
1686         u64 addr;
1687
1688         its = its_dev->its;
1689         addr = its->get_msi_base(its_dev);
1690
1691         msg->address_lo         = lower_32_bits(addr);
1692         msg->address_hi         = upper_32_bits(addr);
1693         msg->data               = its_get_event_id(d);
1694
1695         iommu_dma_compose_msi_msg(irq_data_get_msi_desc(d), msg);
1696 }
1697
1698 static int its_irq_set_irqchip_state(struct irq_data *d,
1699                                      enum irqchip_irq_state which,
1700                                      bool state)
1701 {
1702         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1703         u32 event = its_get_event_id(d);
1704
1705         if (which != IRQCHIP_STATE_PENDING)
1706                 return -EINVAL;
1707
1708         if (irqd_is_forwarded_to_vcpu(d)) {
1709                 if (state)
1710                         its_send_vint(its_dev, event);
1711                 else
1712                         its_send_vclear(its_dev, event);
1713         } else {
1714                 if (state)
1715                         its_send_int(its_dev, event);
1716                 else
1717                         its_send_clear(its_dev, event);
1718         }
1719
1720         return 0;
1721 }
1722
1723 /*
1724  * Two favourable cases:
1725  *
1726  * (a) Either we have a GICv4.1, and all vPEs have to be mapped at all times
1727  *     for vSGI delivery
1728  *
1729  * (b) Or the ITSs do not use a list map, meaning that VMOVP is cheap enough
1730  *     and we're better off mapping all VPEs always
1731  *
1732  * If neither (a) nor (b) is true, then we map vPEs on demand.
1733  *
1734  */
1735 static bool gic_requires_eager_mapping(void)
1736 {
1737         if (!its_list_map || gic_rdists->has_rvpeid)
1738                 return true;
1739
1740         return false;
1741 }
1742
1743 static void its_map_vm(struct its_node *its, struct its_vm *vm)
1744 {
1745         unsigned long flags;
1746
1747         if (gic_requires_eager_mapping())
1748                 return;
1749
1750         raw_spin_lock_irqsave(&vmovp_lock, flags);
1751
1752         /*
1753          * If the VM wasn't mapped yet, iterate over the vpes and get
1754          * them mapped now.
1755          */
1756         vm->vlpi_count[its->list_nr]++;
1757
1758         if (vm->vlpi_count[its->list_nr] == 1) {
1759                 int i;
1760
1761                 for (i = 0; i < vm->nr_vpes; i++) {
1762                         struct its_vpe *vpe = vm->vpes[i];
1763                         struct irq_data *d = irq_get_irq_data(vpe->irq);
1764
1765                         /* Map the VPE to the first possible CPU */
1766                         vpe->col_idx = cpumask_first(cpu_online_mask);
1767                         its_send_vmapp(its, vpe, true);
1768                         its_send_vinvall(its, vpe);
1769                         irq_data_update_effective_affinity(d, cpumask_of(vpe->col_idx));
1770                 }
1771         }
1772
1773         raw_spin_unlock_irqrestore(&vmovp_lock, flags);
1774 }
1775
1776 static void its_unmap_vm(struct its_node *its, struct its_vm *vm)
1777 {
1778         unsigned long flags;
1779
1780         /* Not using the ITS list? Everything is always mapped. */
1781         if (gic_requires_eager_mapping())
1782                 return;
1783
1784         raw_spin_lock_irqsave(&vmovp_lock, flags);
1785
1786         if (!--vm->vlpi_count[its->list_nr]) {
1787                 int i;
1788
1789                 for (i = 0; i < vm->nr_vpes; i++)
1790                         its_send_vmapp(its, vm->vpes[i], false);
1791         }
1792
1793         raw_spin_unlock_irqrestore(&vmovp_lock, flags);
1794 }
1795
1796 static int its_vlpi_map(struct irq_data *d, struct its_cmd_info *info)
1797 {
1798         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1799         u32 event = its_get_event_id(d);
1800         int ret = 0;
1801
1802         if (!info->map)
1803                 return -EINVAL;
1804
1805         raw_spin_lock(&its_dev->event_map.vlpi_lock);
1806
1807         if (!its_dev->event_map.vm) {
1808                 struct its_vlpi_map *maps;
1809
1810                 maps = kcalloc(its_dev->event_map.nr_lpis, sizeof(*maps),
1811                                GFP_ATOMIC);
1812                 if (!maps) {
1813                         ret = -ENOMEM;
1814                         goto out;
1815                 }
1816
1817                 its_dev->event_map.vm = info->map->vm;
1818                 its_dev->event_map.vlpi_maps = maps;
1819         } else if (its_dev->event_map.vm != info->map->vm) {
1820                 ret = -EINVAL;
1821                 goto out;
1822         }
1823
1824         /* Get our private copy of the mapping information */
1825         its_dev->event_map.vlpi_maps[event] = *info->map;
1826
1827         if (irqd_is_forwarded_to_vcpu(d)) {
1828                 /* Already mapped, move it around */
1829                 its_send_vmovi(its_dev, event);
1830         } else {
1831                 /* Ensure all the VPEs are mapped on this ITS */
1832                 its_map_vm(its_dev->its, info->map->vm);
1833
1834                 /*
1835                  * Flag the interrupt as forwarded so that we can
1836                  * start poking the virtual property table.
1837                  */
1838                 irqd_set_forwarded_to_vcpu(d);
1839
1840                 /* Write out the property to the prop table */
1841                 lpi_write_config(d, 0xff, info->map->properties);
1842
1843                 /* Drop the physical mapping */
1844                 its_send_discard(its_dev, event);
1845
1846                 /* and install the virtual one */
1847                 its_send_vmapti(its_dev, event);
1848
1849                 /* Increment the number of VLPIs */
1850                 its_dev->event_map.nr_vlpis++;
1851         }
1852
1853 out:
1854         raw_spin_unlock(&its_dev->event_map.vlpi_lock);
1855         return ret;
1856 }
1857
1858 static int its_vlpi_get(struct irq_data *d, struct its_cmd_info *info)
1859 {
1860         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1861         struct its_vlpi_map *map;
1862         int ret = 0;
1863
1864         raw_spin_lock(&its_dev->event_map.vlpi_lock);
1865
1866         map = get_vlpi_map(d);
1867
1868         if (!its_dev->event_map.vm || !map) {
1869                 ret = -EINVAL;
1870                 goto out;
1871         }
1872
1873         /* Copy our mapping information to the incoming request */
1874         *info->map = *map;
1875
1876 out:
1877         raw_spin_unlock(&its_dev->event_map.vlpi_lock);
1878         return ret;
1879 }
1880
1881 static int its_vlpi_unmap(struct irq_data *d)
1882 {
1883         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1884         u32 event = its_get_event_id(d);
1885         int ret = 0;
1886
1887         raw_spin_lock(&its_dev->event_map.vlpi_lock);
1888
1889         if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d)) {
1890                 ret = -EINVAL;
1891                 goto out;
1892         }
1893
1894         /* Drop the virtual mapping */
1895         its_send_discard(its_dev, event);
1896
1897         /* and restore the physical one */
1898         irqd_clr_forwarded_to_vcpu(d);
1899         its_send_mapti(its_dev, d->hwirq, event);
1900         lpi_update_config(d, 0xff, (LPI_PROP_DEFAULT_PRIO |
1901                                     LPI_PROP_ENABLED |
1902                                     LPI_PROP_GROUP1));
1903
1904         /* Potentially unmap the VM from this ITS */
1905         its_unmap_vm(its_dev->its, its_dev->event_map.vm);
1906
1907         /*
1908          * Drop the refcount and make the device available again if
1909          * this was the last VLPI.
1910          */
1911         if (!--its_dev->event_map.nr_vlpis) {
1912                 its_dev->event_map.vm = NULL;
1913                 kfree(its_dev->event_map.vlpi_maps);
1914         }
1915
1916 out:
1917         raw_spin_unlock(&its_dev->event_map.vlpi_lock);
1918         return ret;
1919 }
1920
1921 static int its_vlpi_prop_update(struct irq_data *d, struct its_cmd_info *info)
1922 {
1923         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1924
1925         if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d))
1926                 return -EINVAL;
1927
1928         if (info->cmd_type == PROP_UPDATE_AND_INV_VLPI)
1929                 lpi_update_config(d, 0xff, info->config);
1930         else
1931                 lpi_write_config(d, 0xff, info->config);
1932         its_vlpi_set_doorbell(d, !!(info->config & LPI_PROP_ENABLED));
1933
1934         return 0;
1935 }
1936
1937 static int its_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
1938 {
1939         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
1940         struct its_cmd_info *info = vcpu_info;
1941
1942         /* Need a v4 ITS */
1943         if (!is_v4(its_dev->its))
1944                 return -EINVAL;
1945
1946         /* Unmap request? */
1947         if (!info)
1948                 return its_vlpi_unmap(d);
1949
1950         switch (info->cmd_type) {
1951         case MAP_VLPI:
1952                 return its_vlpi_map(d, info);
1953
1954         case GET_VLPI:
1955                 return its_vlpi_get(d, info);
1956
1957         case PROP_UPDATE_VLPI:
1958         case PROP_UPDATE_AND_INV_VLPI:
1959                 return its_vlpi_prop_update(d, info);
1960
1961         default:
1962                 return -EINVAL;
1963         }
1964 }
1965
1966 static struct irq_chip its_irq_chip = {
1967         .name                   = "ITS",
1968         .irq_mask               = its_mask_irq,
1969         .irq_unmask             = its_unmask_irq,
1970         .irq_eoi                = irq_chip_eoi_parent,
1971         .irq_set_affinity       = its_set_affinity,
1972         .irq_compose_msi_msg    = its_irq_compose_msi_msg,
1973         .irq_set_irqchip_state  = its_irq_set_irqchip_state,
1974         .irq_set_vcpu_affinity  = its_irq_set_vcpu_affinity,
1975 };
1976
1977
1978 /*
1979  * How we allocate LPIs:
1980  *
1981  * lpi_range_list contains ranges of LPIs that are to available to
1982  * allocate from. To allocate LPIs, just pick the first range that
1983  * fits the required allocation, and reduce it by the required
1984  * amount. Once empty, remove the range from the list.
1985  *
1986  * To free a range of LPIs, add a free range to the list, sort it and
1987  * merge the result if the new range happens to be adjacent to an
1988  * already free block.
1989  *
1990  * The consequence of the above is that allocation is cost is low, but
1991  * freeing is expensive. We assumes that freeing rarely occurs.
1992  */
1993 #define ITS_MAX_LPI_NRBITS      16 /* 64K LPIs */
1994
1995 static DEFINE_MUTEX(lpi_range_lock);
1996 static LIST_HEAD(lpi_range_list);
1997
1998 struct lpi_range {
1999         struct list_head        entry;
2000         u32                     base_id;
2001         u32                     span;
2002 };
2003
2004 static struct lpi_range *mk_lpi_range(u32 base, u32 span)
2005 {
2006         struct lpi_range *range;
2007
2008         range = kmalloc(sizeof(*range), GFP_KERNEL);
2009         if (range) {
2010                 range->base_id = base;
2011                 range->span = span;
2012         }
2013
2014         return range;
2015 }
2016
2017 static int alloc_lpi_range(u32 nr_lpis, u32 *base)
2018 {
2019         struct lpi_range *range, *tmp;
2020         int err = -ENOSPC;
2021
2022         mutex_lock(&lpi_range_lock);
2023
2024         list_for_each_entry_safe(range, tmp, &lpi_range_list, entry) {
2025                 if (range->span >= nr_lpis) {
2026                         *base = range->base_id;
2027                         range->base_id += nr_lpis;
2028                         range->span -= nr_lpis;
2029
2030                         if (range->span == 0) {
2031                                 list_del(&range->entry);
2032                                 kfree(range);
2033                         }
2034
2035                         err = 0;
2036                         break;
2037                 }
2038         }
2039
2040         mutex_unlock(&lpi_range_lock);
2041
2042         pr_debug("ITS: alloc %u:%u\n", *base, nr_lpis);
2043         return err;
2044 }
2045
2046 static void merge_lpi_ranges(struct lpi_range *a, struct lpi_range *b)
2047 {
2048         if (&a->entry == &lpi_range_list || &b->entry == &lpi_range_list)
2049                 return;
2050         if (a->base_id + a->span != b->base_id)
2051                 return;
2052         b->base_id = a->base_id;
2053         b->span += a->span;
2054         list_del(&a->entry);
2055         kfree(a);
2056 }
2057
2058 static int free_lpi_range(u32 base, u32 nr_lpis)
2059 {
2060         struct lpi_range *new, *old;
2061
2062         new = mk_lpi_range(base, nr_lpis);
2063         if (!new)
2064                 return -ENOMEM;
2065
2066         mutex_lock(&lpi_range_lock);
2067
2068         list_for_each_entry_reverse(old, &lpi_range_list, entry) {
2069                 if (old->base_id < base)
2070                         break;
2071         }
2072         /*
2073          * old is the last element with ->base_id smaller than base,
2074          * so new goes right after it. If there are no elements with
2075          * ->base_id smaller than base, &old->entry ends up pointing
2076          * at the head of the list, and inserting new it the start of
2077          * the list is the right thing to do in that case as well.
2078          */
2079         list_add(&new->entry, &old->entry);
2080         /*
2081          * Now check if we can merge with the preceding and/or
2082          * following ranges.
2083          */
2084         merge_lpi_ranges(old, new);
2085         merge_lpi_ranges(new, list_next_entry(new, entry));
2086
2087         mutex_unlock(&lpi_range_lock);
2088         return 0;
2089 }
2090
2091 static int __init its_lpi_init(u32 id_bits)
2092 {
2093         u32 lpis = (1UL << id_bits) - 8192;
2094         u32 numlpis;
2095         int err;
2096
2097         numlpis = 1UL << GICD_TYPER_NUM_LPIS(gic_rdists->gicd_typer);
2098
2099         if (numlpis > 2 && !WARN_ON(numlpis > lpis)) {
2100                 lpis = numlpis;
2101                 pr_info("ITS: Using hypervisor restricted LPI range [%u]\n",
2102                         lpis);
2103         }
2104
2105         /*
2106          * Initializing the allocator is just the same as freeing the
2107          * full range of LPIs.
2108          */
2109         err = free_lpi_range(8192, lpis);
2110         pr_debug("ITS: Allocator initialized for %u LPIs\n", lpis);
2111         return err;
2112 }
2113
2114 static unsigned long *its_lpi_alloc(int nr_irqs, u32 *base, int *nr_ids)
2115 {
2116         unsigned long *bitmap = NULL;
2117         int err = 0;
2118
2119         do {
2120                 err = alloc_lpi_range(nr_irqs, base);
2121                 if (!err)
2122                         break;
2123
2124                 nr_irqs /= 2;
2125         } while (nr_irqs > 0);
2126
2127         if (!nr_irqs)
2128                 err = -ENOSPC;
2129
2130         if (err)
2131                 goto out;
2132
2133         bitmap = kcalloc(BITS_TO_LONGS(nr_irqs), sizeof (long), GFP_ATOMIC);
2134         if (!bitmap)
2135                 goto out;
2136
2137         *nr_ids = nr_irqs;
2138
2139 out:
2140         if (!bitmap)
2141                 *base = *nr_ids = 0;
2142
2143         return bitmap;
2144 }
2145
2146 static void its_lpi_free(unsigned long *bitmap, u32 base, u32 nr_ids)
2147 {
2148         WARN_ON(free_lpi_range(base, nr_ids));
2149         kfree(bitmap);
2150 }
2151
2152 static void gic_reset_prop_table(void *va)
2153 {
2154         /* Priority 0xa0, Group-1, disabled */
2155         memset(va, LPI_PROP_DEFAULT_PRIO | LPI_PROP_GROUP1, LPI_PROPBASE_SZ);
2156
2157         /* Make sure the GIC will observe the written configuration */
2158         gic_flush_dcache_to_poc(va, LPI_PROPBASE_SZ);
2159 }
2160
2161 static struct page *its_allocate_prop_table(gfp_t gfp_flags)
2162 {
2163         struct page *prop_page;
2164
2165         prop_page = alloc_pages(gfp_flags, get_order(LPI_PROPBASE_SZ));
2166         if (!prop_page)
2167                 return NULL;
2168
2169         gic_reset_prop_table(page_address(prop_page));
2170
2171         return prop_page;
2172 }
2173
2174 static void its_free_prop_table(struct page *prop_page)
2175 {
2176         free_pages((unsigned long)page_address(prop_page),
2177                    get_order(LPI_PROPBASE_SZ));
2178 }
2179
2180 static bool gic_check_reserved_range(phys_addr_t addr, unsigned long size)
2181 {
2182         phys_addr_t start, end, addr_end;
2183         u64 i;
2184
2185         /*
2186          * We don't bother checking for a kdump kernel as by
2187          * construction, the LPI tables are out of this kernel's
2188          * memory map.
2189          */
2190         if (is_kdump_kernel())
2191                 return true;
2192
2193         addr_end = addr + size - 1;
2194
2195         for_each_reserved_mem_region(i, &start, &end) {
2196                 if (addr >= start && addr_end <= end)
2197                         return true;
2198         }
2199
2200         /* Not found, not a good sign... */
2201         pr_warn("GICv3: Expected reserved range [%pa:%pa], not found\n",
2202                 &addr, &addr_end);
2203         add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
2204         return false;
2205 }
2206
2207 static int gic_reserve_range(phys_addr_t addr, unsigned long size)
2208 {
2209         if (efi_enabled(EFI_CONFIG_TABLES))
2210                 return efi_mem_reserve_persistent(addr, size);
2211
2212         return 0;
2213 }
2214
2215 static int __init its_setup_lpi_prop_table(void)
2216 {
2217         if (gic_rdists->flags & RDIST_FLAGS_RD_TABLES_PREALLOCATED) {
2218                 u64 val;
2219
2220                 val = gicr_read_propbaser(gic_data_rdist_rd_base() + GICR_PROPBASER);
2221                 lpi_id_bits = (val & GICR_PROPBASER_IDBITS_MASK) + 1;
2222
2223                 gic_rdists->prop_table_pa = val & GENMASK_ULL(51, 12);
2224                 gic_rdists->prop_table_va = memremap(gic_rdists->prop_table_pa,
2225                                                      LPI_PROPBASE_SZ,
2226                                                      MEMREMAP_WB);
2227                 gic_reset_prop_table(gic_rdists->prop_table_va);
2228         } else {
2229                 struct page *page;
2230
2231                 lpi_id_bits = min_t(u32,
2232                                     GICD_TYPER_ID_BITS(gic_rdists->gicd_typer),
2233                                     ITS_MAX_LPI_NRBITS);
2234                 page = its_allocate_prop_table(GFP_NOWAIT);
2235                 if (!page) {
2236                         pr_err("Failed to allocate PROPBASE\n");
2237                         return -ENOMEM;
2238                 }
2239
2240                 gic_rdists->prop_table_pa = page_to_phys(page);
2241                 gic_rdists->prop_table_va = page_address(page);
2242                 WARN_ON(gic_reserve_range(gic_rdists->prop_table_pa,
2243                                           LPI_PROPBASE_SZ));
2244         }
2245
2246         pr_info("GICv3: using LPI property table @%pa\n",
2247                 &gic_rdists->prop_table_pa);
2248
2249         return its_lpi_init(lpi_id_bits);
2250 }
2251
2252 static const char *its_base_type_string[] = {
2253         [GITS_BASER_TYPE_DEVICE]        = "Devices",
2254         [GITS_BASER_TYPE_VCPU]          = "Virtual CPUs",
2255         [GITS_BASER_TYPE_RESERVED3]     = "Reserved (3)",
2256         [GITS_BASER_TYPE_COLLECTION]    = "Interrupt Collections",
2257         [GITS_BASER_TYPE_RESERVED5]     = "Reserved (5)",
2258         [GITS_BASER_TYPE_RESERVED6]     = "Reserved (6)",
2259         [GITS_BASER_TYPE_RESERVED7]     = "Reserved (7)",
2260 };
2261
2262 static u64 its_read_baser(struct its_node *its, struct its_baser *baser)
2263 {
2264         u32 idx = baser - its->tables;
2265
2266         return gits_read_baser(its->base + GITS_BASER + (idx << 3));
2267 }
2268
2269 static void its_write_baser(struct its_node *its, struct its_baser *baser,
2270                             u64 val)
2271 {
2272         u32 idx = baser - its->tables;
2273
2274         gits_write_baser(val, its->base + GITS_BASER + (idx << 3));
2275         baser->val = its_read_baser(its, baser);
2276 }
2277
2278 static int its_setup_baser(struct its_node *its, struct its_baser *baser,
2279                            u64 cache, u64 shr, u32 order, bool indirect)
2280 {
2281         u64 val = its_read_baser(its, baser);
2282         u64 esz = GITS_BASER_ENTRY_SIZE(val);
2283         u64 type = GITS_BASER_TYPE(val);
2284         u64 baser_phys, tmp;
2285         u32 alloc_pages, psz;
2286         struct page *page;
2287         void *base;
2288
2289         psz = baser->psz;
2290         alloc_pages = (PAGE_ORDER_TO_SIZE(order) / psz);
2291         if (alloc_pages > GITS_BASER_PAGES_MAX) {
2292                 pr_warn("ITS@%pa: %s too large, reduce ITS pages %u->%u\n",
2293                         &its->phys_base, its_base_type_string[type],
2294                         alloc_pages, GITS_BASER_PAGES_MAX);
2295                 alloc_pages = GITS_BASER_PAGES_MAX;
2296                 order = get_order(GITS_BASER_PAGES_MAX * psz);
2297         }
2298
2299         page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO, order);
2300         if (!page)
2301                 return -ENOMEM;
2302
2303         base = (void *)page_address(page);
2304         baser_phys = virt_to_phys(base);
2305
2306         /* Check if the physical address of the memory is above 48bits */
2307         if (IS_ENABLED(CONFIG_ARM64_64K_PAGES) && (baser_phys >> 48)) {
2308
2309                 /* 52bit PA is supported only when PageSize=64K */
2310                 if (psz != SZ_64K) {
2311                         pr_err("ITS: no 52bit PA support when psz=%d\n", psz);
2312                         free_pages((unsigned long)base, order);
2313                         return -ENXIO;
2314                 }
2315
2316                 /* Convert 52bit PA to 48bit field */
2317                 baser_phys = GITS_BASER_PHYS_52_to_48(baser_phys);
2318         }
2319
2320 retry_baser:
2321         val = (baser_phys                                        |
2322                 (type << GITS_BASER_TYPE_SHIFT)                  |
2323                 ((esz - 1) << GITS_BASER_ENTRY_SIZE_SHIFT)       |
2324                 ((alloc_pages - 1) << GITS_BASER_PAGES_SHIFT)    |
2325                 cache                                            |
2326                 shr                                              |
2327                 GITS_BASER_VALID);
2328
2329         val |=  indirect ? GITS_BASER_INDIRECT : 0x0;
2330
2331         switch (psz) {
2332         case SZ_4K:
2333                 val |= GITS_BASER_PAGE_SIZE_4K;
2334                 break;
2335         case SZ_16K:
2336                 val |= GITS_BASER_PAGE_SIZE_16K;
2337                 break;
2338         case SZ_64K:
2339                 val |= GITS_BASER_PAGE_SIZE_64K;
2340                 break;
2341         }
2342
2343         its_write_baser(its, baser, val);
2344         tmp = baser->val;
2345
2346         if ((val ^ tmp) & GITS_BASER_SHAREABILITY_MASK) {
2347                 /*
2348                  * Shareability didn't stick. Just use
2349                  * whatever the read reported, which is likely
2350                  * to be the only thing this redistributor
2351                  * supports. If that's zero, make it
2352                  * non-cacheable as well.
2353                  */
2354                 shr = tmp & GITS_BASER_SHAREABILITY_MASK;
2355                 if (!shr) {
2356                         cache = GITS_BASER_nC;
2357                         gic_flush_dcache_to_poc(base, PAGE_ORDER_TO_SIZE(order));
2358                 }
2359                 goto retry_baser;
2360         }
2361
2362         if (val != tmp) {
2363                 pr_err("ITS@%pa: %s doesn't stick: %llx %llx\n",
2364                        &its->phys_base, its_base_type_string[type],
2365                        val, tmp);
2366                 free_pages((unsigned long)base, order);
2367                 return -ENXIO;
2368         }
2369
2370         baser->order = order;
2371         baser->base = base;
2372         baser->psz = psz;
2373         tmp = indirect ? GITS_LVL1_ENTRY_SIZE : esz;
2374
2375         pr_info("ITS@%pa: allocated %d %s @%lx (%s, esz %d, psz %dK, shr %d)\n",
2376                 &its->phys_base, (int)(PAGE_ORDER_TO_SIZE(order) / (int)tmp),
2377                 its_base_type_string[type],
2378                 (unsigned long)virt_to_phys(base),
2379                 indirect ? "indirect" : "flat", (int)esz,
2380                 psz / SZ_1K, (int)shr >> GITS_BASER_SHAREABILITY_SHIFT);
2381
2382         return 0;
2383 }
2384
2385 static bool its_parse_indirect_baser(struct its_node *its,
2386                                      struct its_baser *baser,
2387                                      u32 *order, u32 ids)
2388 {
2389         u64 tmp = its_read_baser(its, baser);
2390         u64 type = GITS_BASER_TYPE(tmp);
2391         u64 esz = GITS_BASER_ENTRY_SIZE(tmp);
2392         u64 val = GITS_BASER_InnerShareable | GITS_BASER_RaWaWb;
2393         u32 new_order = *order;
2394         u32 psz = baser->psz;
2395         bool indirect = false;
2396
2397         /* No need to enable Indirection if memory requirement < (psz*2)bytes */
2398         if ((esz << ids) > (psz * 2)) {
2399                 /*
2400                  * Find out whether hw supports a single or two-level table by
2401                  * table by reading bit at offset '62' after writing '1' to it.
2402                  */
2403                 its_write_baser(its, baser, val | GITS_BASER_INDIRECT);
2404                 indirect = !!(baser->val & GITS_BASER_INDIRECT);
2405
2406                 if (indirect) {
2407                         /*
2408                          * The size of the lvl2 table is equal to ITS page size
2409                          * which is 'psz'. For computing lvl1 table size,
2410                          * subtract ID bits that sparse lvl2 table from 'ids'
2411                          * which is reported by ITS hardware times lvl1 table
2412                          * entry size.
2413                          */
2414                         ids -= ilog2(psz / (int)esz);
2415                         esz = GITS_LVL1_ENTRY_SIZE;
2416                 }
2417         }
2418
2419         /*
2420          * Allocate as many entries as required to fit the
2421          * range of device IDs that the ITS can grok... The ID
2422          * space being incredibly sparse, this results in a
2423          * massive waste of memory if two-level device table
2424          * feature is not supported by hardware.
2425          */
2426         new_order = max_t(u32, get_order(esz << ids), new_order);
2427         if (new_order >= MAX_ORDER) {
2428                 new_order = MAX_ORDER - 1;
2429                 ids = ilog2(PAGE_ORDER_TO_SIZE(new_order) / (int)esz);
2430                 pr_warn("ITS@%pa: %s Table too large, reduce ids %llu->%u\n",
2431                         &its->phys_base, its_base_type_string[type],
2432                         device_ids(its), ids);
2433         }
2434
2435         *order = new_order;
2436
2437         return indirect;
2438 }
2439
2440 static u32 compute_common_aff(u64 val)
2441 {
2442         u32 aff, clpiaff;
2443
2444         aff = FIELD_GET(GICR_TYPER_AFFINITY, val);
2445         clpiaff = FIELD_GET(GICR_TYPER_COMMON_LPI_AFF, val);
2446
2447         return aff & ~(GENMASK(31, 0) >> (clpiaff * 8));
2448 }
2449
2450 static u32 compute_its_aff(struct its_node *its)
2451 {
2452         u64 val;
2453         u32 svpet;
2454
2455         /*
2456          * Reencode the ITS SVPET and MPIDR as a GICR_TYPER, and compute
2457          * the resulting affinity. We then use that to see if this match
2458          * our own affinity.
2459          */
2460         svpet = FIELD_GET(GITS_TYPER_SVPET, its->typer);
2461         val  = FIELD_PREP(GICR_TYPER_COMMON_LPI_AFF, svpet);
2462         val |= FIELD_PREP(GICR_TYPER_AFFINITY, its->mpidr);
2463         return compute_common_aff(val);
2464 }
2465
2466 static struct its_node *find_sibling_its(struct its_node *cur_its)
2467 {
2468         struct its_node *its;
2469         u32 aff;
2470
2471         if (!FIELD_GET(GITS_TYPER_SVPET, cur_its->typer))
2472                 return NULL;
2473
2474         aff = compute_its_aff(cur_its);
2475
2476         list_for_each_entry(its, &its_nodes, entry) {
2477                 u64 baser;
2478
2479                 if (!is_v4_1(its) || its == cur_its)
2480                         continue;
2481
2482                 if (!FIELD_GET(GITS_TYPER_SVPET, its->typer))
2483                         continue;
2484
2485                 if (aff != compute_its_aff(its))
2486                         continue;
2487
2488                 /* GICv4.1 guarantees that the vPE table is GITS_BASER2 */
2489                 baser = its->tables[2].val;
2490                 if (!(baser & GITS_BASER_VALID))
2491                         continue;
2492
2493                 return its;
2494         }
2495
2496         return NULL;
2497 }
2498
2499 static void its_free_tables(struct its_node *its)
2500 {
2501         int i;
2502
2503         for (i = 0; i < GITS_BASER_NR_REGS; i++) {
2504                 if (its->tables[i].base) {
2505                         free_pages((unsigned long)its->tables[i].base,
2506                                    its->tables[i].order);
2507                         its->tables[i].base = NULL;
2508                 }
2509         }
2510 }
2511
2512 static int its_probe_baser_psz(struct its_node *its, struct its_baser *baser)
2513 {
2514         u64 psz = SZ_64K;
2515
2516         while (psz) {
2517                 u64 val, gpsz;
2518
2519                 val = its_read_baser(its, baser);
2520                 val &= ~GITS_BASER_PAGE_SIZE_MASK;
2521
2522                 switch (psz) {
2523                 case SZ_64K:
2524                         gpsz = GITS_BASER_PAGE_SIZE_64K;
2525                         break;
2526                 case SZ_16K:
2527                         gpsz = GITS_BASER_PAGE_SIZE_16K;
2528                         break;
2529                 case SZ_4K:
2530                 default:
2531                         gpsz = GITS_BASER_PAGE_SIZE_4K;
2532                         break;
2533                 }
2534
2535                 gpsz >>= GITS_BASER_PAGE_SIZE_SHIFT;
2536
2537                 val |= FIELD_PREP(GITS_BASER_PAGE_SIZE_MASK, gpsz);
2538                 its_write_baser(its, baser, val);
2539
2540                 if (FIELD_GET(GITS_BASER_PAGE_SIZE_MASK, baser->val) == gpsz)
2541                         break;
2542
2543                 switch (psz) {
2544                 case SZ_64K:
2545                         psz = SZ_16K;
2546                         break;
2547                 case SZ_16K:
2548                         psz = SZ_4K;
2549                         break;
2550                 case SZ_4K:
2551                 default:
2552                         return -1;
2553                 }
2554         }
2555
2556         baser->psz = psz;
2557         return 0;
2558 }
2559
2560 static int its_alloc_tables(struct its_node *its)
2561 {
2562         u64 shr = GITS_BASER_InnerShareable;
2563         u64 cache = GITS_BASER_RaWaWb;
2564         int err, i;
2565
2566         if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_22375)
2567                 /* erratum 24313: ignore memory access type */
2568                 cache = GITS_BASER_nCnB;
2569
2570         for (i = 0; i < GITS_BASER_NR_REGS; i++) {
2571                 struct its_baser *baser = its->tables + i;
2572                 u64 val = its_read_baser(its, baser);
2573                 u64 type = GITS_BASER_TYPE(val);
2574                 bool indirect = false;
2575                 u32 order;
2576
2577                 if (type == GITS_BASER_TYPE_NONE)
2578                         continue;
2579
2580                 if (its_probe_baser_psz(its, baser)) {
2581                         its_free_tables(its);
2582                         return -ENXIO;
2583                 }
2584
2585                 order = get_order(baser->psz);
2586
2587                 switch (type) {
2588                 case GITS_BASER_TYPE_DEVICE:
2589                         indirect = its_parse_indirect_baser(its, baser, &order,
2590                                                             device_ids(its));
2591                         break;
2592
2593                 case GITS_BASER_TYPE_VCPU:
2594                         if (is_v4_1(its)) {
2595                                 struct its_node *sibling;
2596
2597                                 WARN_ON(i != 2);
2598                                 if ((sibling = find_sibling_its(its))) {
2599                                         *baser = sibling->tables[2];
2600                                         its_write_baser(its, baser, baser->val);
2601                                         continue;
2602                                 }
2603                         }
2604
2605                         indirect = its_parse_indirect_baser(its, baser, &order,
2606                                                             ITS_MAX_VPEID_BITS);
2607                         break;
2608                 }
2609
2610                 err = its_setup_baser(its, baser, cache, shr, order, indirect);
2611                 if (err < 0) {
2612                         its_free_tables(its);
2613                         return err;
2614                 }
2615
2616                 /* Update settings which will be used for next BASERn */
2617                 cache = baser->val & GITS_BASER_CACHEABILITY_MASK;
2618                 shr = baser->val & GITS_BASER_SHAREABILITY_MASK;
2619         }
2620
2621         return 0;
2622 }
2623
2624 static u64 inherit_vpe_l1_table_from_its(void)
2625 {
2626         struct its_node *its;
2627         u64 val;
2628         u32 aff;
2629
2630         val = gic_read_typer(gic_data_rdist_rd_base() + GICR_TYPER);
2631         aff = compute_common_aff(val);
2632
2633         list_for_each_entry(its, &its_nodes, entry) {
2634                 u64 baser, addr;
2635
2636                 if (!is_v4_1(its))
2637                         continue;
2638
2639                 if (!FIELD_GET(GITS_TYPER_SVPET, its->typer))
2640                         continue;
2641
2642                 if (aff != compute_its_aff(its))
2643                         continue;
2644
2645                 /* GICv4.1 guarantees that the vPE table is GITS_BASER2 */
2646                 baser = its->tables[2].val;
2647                 if (!(baser & GITS_BASER_VALID))
2648                         continue;
2649
2650                 /* We have a winner! */
2651                 gic_data_rdist()->vpe_l1_base = its->tables[2].base;
2652
2653                 val  = GICR_VPROPBASER_4_1_VALID;
2654                 if (baser & GITS_BASER_INDIRECT)
2655                         val |= GICR_VPROPBASER_4_1_INDIRECT;
2656                 val |= FIELD_PREP(GICR_VPROPBASER_4_1_PAGE_SIZE,
2657                                   FIELD_GET(GITS_BASER_PAGE_SIZE_MASK, baser));
2658                 switch (FIELD_GET(GITS_BASER_PAGE_SIZE_MASK, baser)) {
2659                 case GIC_PAGE_SIZE_64K:
2660                         addr = GITS_BASER_ADDR_48_to_52(baser);
2661                         break;
2662                 default:
2663                         addr = baser & GENMASK_ULL(47, 12);
2664                         break;
2665                 }
2666                 val |= FIELD_PREP(GICR_VPROPBASER_4_1_ADDR, addr >> 12);
2667                 val |= FIELD_PREP(GICR_VPROPBASER_SHAREABILITY_MASK,
2668                                   FIELD_GET(GITS_BASER_SHAREABILITY_MASK, baser));
2669                 val |= FIELD_PREP(GICR_VPROPBASER_INNER_CACHEABILITY_MASK,
2670                                   FIELD_GET(GITS_BASER_INNER_CACHEABILITY_MASK, baser));
2671                 val |= FIELD_PREP(GICR_VPROPBASER_4_1_SIZE, GITS_BASER_NR_PAGES(baser) - 1);
2672
2673                 return val;
2674         }
2675
2676         return 0;
2677 }
2678
2679 static u64 inherit_vpe_l1_table_from_rd(cpumask_t **mask)
2680 {
2681         u32 aff;
2682         u64 val;
2683         int cpu;
2684
2685         val = gic_read_typer(gic_data_rdist_rd_base() + GICR_TYPER);
2686         aff = compute_common_aff(val);
2687
2688         for_each_possible_cpu(cpu) {
2689                 void __iomem *base = gic_data_rdist_cpu(cpu)->rd_base;
2690
2691                 if (!base || cpu == smp_processor_id())
2692                         continue;
2693
2694                 val = gic_read_typer(base + GICR_TYPER);
2695                 if (aff != compute_common_aff(val))
2696                         continue;
2697
2698                 /*
2699                  * At this point, we have a victim. This particular CPU
2700                  * has already booted, and has an affinity that matches
2701                  * ours wrt CommonLPIAff. Let's use its own VPROPBASER.
2702                  * Make sure we don't write the Z bit in that case.
2703                  */
2704                 val = gicr_read_vpropbaser(base + SZ_128K + GICR_VPROPBASER);
2705                 val &= ~GICR_VPROPBASER_4_1_Z;
2706
2707                 gic_data_rdist()->vpe_l1_base = gic_data_rdist_cpu(cpu)->vpe_l1_base;
2708                 *mask = gic_data_rdist_cpu(cpu)->vpe_table_mask;
2709
2710                 return val;
2711         }
2712
2713         return 0;
2714 }
2715
2716 static bool allocate_vpe_l2_table(int cpu, u32 id)
2717 {
2718         void __iomem *base = gic_data_rdist_cpu(cpu)->rd_base;
2719         unsigned int psz, esz, idx, npg, gpsz;
2720         u64 val;
2721         struct page *page;
2722         __le64 *table;
2723
2724         if (!gic_rdists->has_rvpeid)
2725                 return true;
2726
2727         /* Skip non-present CPUs */
2728         if (!base)
2729                 return true;
2730
2731         val  = gicr_read_vpropbaser(base + SZ_128K + GICR_VPROPBASER);
2732
2733         esz  = FIELD_GET(GICR_VPROPBASER_4_1_ENTRY_SIZE, val) + 1;
2734         gpsz = FIELD_GET(GICR_VPROPBASER_4_1_PAGE_SIZE, val);
2735         npg  = FIELD_GET(GICR_VPROPBASER_4_1_SIZE, val) + 1;
2736
2737         switch (gpsz) {
2738         default:
2739                 WARN_ON(1);
2740                 /* fall through */
2741         case GIC_PAGE_SIZE_4K:
2742                 psz = SZ_4K;
2743                 break;
2744         case GIC_PAGE_SIZE_16K:
2745                 psz = SZ_16K;
2746                 break;
2747         case GIC_PAGE_SIZE_64K:
2748                 psz = SZ_64K;
2749                 break;
2750         }
2751
2752         /* Don't allow vpe_id that exceeds single, flat table limit */
2753         if (!(val & GICR_VPROPBASER_4_1_INDIRECT))
2754                 return (id < (npg * psz / (esz * SZ_8)));
2755
2756         /* Compute 1st level table index & check if that exceeds table limit */
2757         idx = id >> ilog2(psz / (esz * SZ_8));
2758         if (idx >= (npg * psz / GITS_LVL1_ENTRY_SIZE))
2759                 return false;
2760
2761         table = gic_data_rdist_cpu(cpu)->vpe_l1_base;
2762
2763         /* Allocate memory for 2nd level table */
2764         if (!table[idx]) {
2765                 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, get_order(psz));
2766                 if (!page)
2767                         return false;
2768
2769                 /* Flush Lvl2 table to PoC if hw doesn't support coherency */
2770                 if (!(val & GICR_VPROPBASER_SHAREABILITY_MASK))
2771                         gic_flush_dcache_to_poc(page_address(page), psz);
2772
2773                 table[idx] = cpu_to_le64(page_to_phys(page) | GITS_BASER_VALID);
2774
2775                 /* Flush Lvl1 entry to PoC if hw doesn't support coherency */
2776                 if (!(val & GICR_VPROPBASER_SHAREABILITY_MASK))
2777                         gic_flush_dcache_to_poc(table + idx, GITS_LVL1_ENTRY_SIZE);
2778
2779                 /* Ensure updated table contents are visible to RD hardware */
2780                 dsb(sy);
2781         }
2782
2783         return true;
2784 }
2785
2786 static int allocate_vpe_l1_table(void)
2787 {
2788         void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
2789         u64 val, gpsz, npg, pa;
2790         unsigned int psz = SZ_64K;
2791         unsigned int np, epp, esz;
2792         struct page *page;
2793
2794         if (!gic_rdists->has_rvpeid)
2795                 return 0;
2796
2797         /*
2798          * if VPENDBASER.Valid is set, disable any previously programmed
2799          * VPE by setting PendingLast while clearing Valid. This has the
2800          * effect of making sure no doorbell will be generated and we can
2801          * then safely clear VPROPBASER.Valid.
2802          */
2803         if (gicr_read_vpendbaser(vlpi_base + GICR_VPENDBASER) & GICR_VPENDBASER_Valid)
2804                 gicr_write_vpendbaser(GICR_VPENDBASER_PendingLast,
2805                                       vlpi_base + GICR_VPENDBASER);
2806
2807         /*
2808          * If we can inherit the configuration from another RD, let's do
2809          * so. Otherwise, we have to go through the allocation process. We
2810          * assume that all RDs have the exact same requirements, as
2811          * nothing will work otherwise.
2812          */
2813         val = inherit_vpe_l1_table_from_rd(&gic_data_rdist()->vpe_table_mask);
2814         if (val & GICR_VPROPBASER_4_1_VALID)
2815                 goto out;
2816
2817         gic_data_rdist()->vpe_table_mask = kzalloc(sizeof(cpumask_t), GFP_KERNEL);
2818         if (!gic_data_rdist()->vpe_table_mask)
2819                 return -ENOMEM;
2820
2821         val = inherit_vpe_l1_table_from_its();
2822         if (val & GICR_VPROPBASER_4_1_VALID)
2823                 goto out;
2824
2825         /* First probe the page size */
2826         val = FIELD_PREP(GICR_VPROPBASER_4_1_PAGE_SIZE, GIC_PAGE_SIZE_64K);
2827         gicr_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
2828         val = gicr_read_vpropbaser(vlpi_base + GICR_VPROPBASER);
2829         gpsz = FIELD_GET(GICR_VPROPBASER_4_1_PAGE_SIZE, val);
2830         esz = FIELD_GET(GICR_VPROPBASER_4_1_ENTRY_SIZE, val);
2831
2832         switch (gpsz) {
2833         default:
2834                 gpsz = GIC_PAGE_SIZE_4K;
2835                 /* fall through */
2836         case GIC_PAGE_SIZE_4K:
2837                 psz = SZ_4K;
2838                 break;
2839         case GIC_PAGE_SIZE_16K:
2840                 psz = SZ_16K;
2841                 break;
2842         case GIC_PAGE_SIZE_64K:
2843                 psz = SZ_64K;
2844                 break;
2845         }
2846
2847         /*
2848          * Start populating the register from scratch, including RO fields
2849          * (which we want to print in debug cases...)
2850          */
2851         val = 0;
2852         val |= FIELD_PREP(GICR_VPROPBASER_4_1_PAGE_SIZE, gpsz);
2853         val |= FIELD_PREP(GICR_VPROPBASER_4_1_ENTRY_SIZE, esz);
2854
2855         /* How many entries per GIC page? */
2856         esz++;
2857         epp = psz / (esz * SZ_8);
2858
2859         /*
2860          * If we need more than just a single L1 page, flag the table
2861          * as indirect and compute the number of required L1 pages.
2862          */
2863         if (epp < ITS_MAX_VPEID) {
2864                 int nl2;
2865
2866                 val |= GICR_VPROPBASER_4_1_INDIRECT;
2867
2868                 /* Number of L2 pages required to cover the VPEID space */
2869                 nl2 = DIV_ROUND_UP(ITS_MAX_VPEID, epp);
2870
2871                 /* Number of L1 pages to point to the L2 pages */
2872                 npg = DIV_ROUND_UP(nl2 * SZ_8, psz);
2873         } else {
2874                 npg = 1;
2875         }
2876
2877         val |= FIELD_PREP(GICR_VPROPBASER_4_1_SIZE, npg - 1);
2878
2879         /* Right, that's the number of CPU pages we need for L1 */
2880         np = DIV_ROUND_UP(npg * psz, PAGE_SIZE);
2881
2882         pr_debug("np = %d, npg = %lld, psz = %d, epp = %d, esz = %d\n",
2883                  np, npg, psz, epp, esz);
2884         page = alloc_pages(GFP_KERNEL | __GFP_ZERO, get_order(np * PAGE_SIZE));
2885         if (!page)
2886                 return -ENOMEM;
2887
2888         gic_data_rdist()->vpe_l1_base = page_address(page);
2889         pa = virt_to_phys(page_address(page));
2890         WARN_ON(!IS_ALIGNED(pa, psz));
2891
2892         val |= FIELD_PREP(GICR_VPROPBASER_4_1_ADDR, pa >> 12);
2893         val |= GICR_VPROPBASER_RaWb;
2894         val |= GICR_VPROPBASER_InnerShareable;
2895         val |= GICR_VPROPBASER_4_1_Z;
2896         val |= GICR_VPROPBASER_4_1_VALID;
2897
2898 out:
2899         gicr_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
2900         cpumask_set_cpu(smp_processor_id(), gic_data_rdist()->vpe_table_mask);
2901
2902         pr_debug("CPU%d: VPROPBASER = %llx %*pbl\n",
2903                  smp_processor_id(), val,
2904                  cpumask_pr_args(gic_data_rdist()->vpe_table_mask));
2905
2906         return 0;
2907 }
2908
2909 static int its_alloc_collections(struct its_node *its)
2910 {
2911         int i;
2912
2913         its->collections = kcalloc(nr_cpu_ids, sizeof(*its->collections),
2914                                    GFP_KERNEL);
2915         if (!its->collections)
2916                 return -ENOMEM;
2917
2918         for (i = 0; i < nr_cpu_ids; i++)
2919                 its->collections[i].target_address = ~0ULL;
2920
2921         return 0;
2922 }
2923
2924 static struct page *its_allocate_pending_table(gfp_t gfp_flags)
2925 {
2926         struct page *pend_page;
2927
2928         pend_page = alloc_pages(gfp_flags | __GFP_ZERO,
2929                                 get_order(LPI_PENDBASE_SZ));
2930         if (!pend_page)
2931                 return NULL;
2932
2933         /* Make sure the GIC will observe the zero-ed page */
2934         gic_flush_dcache_to_poc(page_address(pend_page), LPI_PENDBASE_SZ);
2935
2936         return pend_page;
2937 }
2938
2939 static void its_free_pending_table(struct page *pt)
2940 {
2941         free_pages((unsigned long)page_address(pt), get_order(LPI_PENDBASE_SZ));
2942 }
2943
2944 /*
2945  * Booting with kdump and LPIs enabled is generally fine. Any other
2946  * case is wrong in the absence of firmware/EFI support.
2947  */
2948 static bool enabled_lpis_allowed(void)
2949 {
2950         phys_addr_t addr;
2951         u64 val;
2952
2953         /* Check whether the property table is in a reserved region */
2954         val = gicr_read_propbaser(gic_data_rdist_rd_base() + GICR_PROPBASER);
2955         addr = val & GENMASK_ULL(51, 12);
2956
2957         return gic_check_reserved_range(addr, LPI_PROPBASE_SZ);
2958 }
2959
2960 static int __init allocate_lpi_tables(void)
2961 {
2962         u64 val;
2963         int err, cpu;
2964
2965         /*
2966          * If LPIs are enabled while we run this from the boot CPU,
2967          * flag the RD tables as pre-allocated if the stars do align.
2968          */
2969         val = readl_relaxed(gic_data_rdist_rd_base() + GICR_CTLR);
2970         if ((val & GICR_CTLR_ENABLE_LPIS) && enabled_lpis_allowed()) {
2971                 gic_rdists->flags |= (RDIST_FLAGS_RD_TABLES_PREALLOCATED |
2972                                       RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING);
2973                 pr_info("GICv3: Using preallocated redistributor tables\n");
2974         }
2975
2976         err = its_setup_lpi_prop_table();
2977         if (err)
2978                 return err;
2979
2980         /*
2981          * We allocate all the pending tables anyway, as we may have a
2982          * mix of RDs that have had LPIs enabled, and some that
2983          * don't. We'll free the unused ones as each CPU comes online.
2984          */
2985         for_each_possible_cpu(cpu) {
2986                 struct page *pend_page;
2987
2988                 pend_page = its_allocate_pending_table(GFP_NOWAIT);
2989                 if (!pend_page) {
2990                         pr_err("Failed to allocate PENDBASE for CPU%d\n", cpu);
2991                         return -ENOMEM;
2992                 }
2993
2994                 gic_data_rdist_cpu(cpu)->pend_page = pend_page;
2995         }
2996
2997         return 0;
2998 }
2999
3000 static u64 its_clear_vpend_valid(void __iomem *vlpi_base, u64 clr, u64 set)
3001 {
3002         u32 count = 1000000;    /* 1s! */
3003         bool clean;
3004         u64 val;
3005
3006         val = gicr_read_vpendbaser(vlpi_base + GICR_VPENDBASER);
3007         val &= ~GICR_VPENDBASER_Valid;
3008         val &= ~clr;
3009         val |= set;
3010         gicr_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
3011
3012         do {
3013                 val = gicr_read_vpendbaser(vlpi_base + GICR_VPENDBASER);
3014                 clean = !(val & GICR_VPENDBASER_Dirty);
3015                 if (!clean) {
3016                         count--;
3017                         cpu_relax();
3018                         udelay(1);
3019                 }
3020         } while (!clean && count);
3021
3022         if (unlikely(val & GICR_VPENDBASER_Dirty)) {
3023                 pr_err_ratelimited("ITS virtual pending table not cleaning\n");
3024                 val |= GICR_VPENDBASER_PendingLast;
3025         }
3026
3027         return val;
3028 }
3029
3030 static void its_cpu_init_lpis(void)
3031 {
3032         void __iomem *rbase = gic_data_rdist_rd_base();
3033         struct page *pend_page;
3034         phys_addr_t paddr;
3035         u64 val, tmp;
3036
3037         if (gic_data_rdist()->lpi_enabled)
3038                 return;
3039
3040         val = readl_relaxed(rbase + GICR_CTLR);
3041         if ((gic_rdists->flags & RDIST_FLAGS_RD_TABLES_PREALLOCATED) &&
3042             (val & GICR_CTLR_ENABLE_LPIS)) {
3043                 /*
3044                  * Check that we get the same property table on all
3045                  * RDs. If we don't, this is hopeless.
3046                  */
3047                 paddr = gicr_read_propbaser(rbase + GICR_PROPBASER);
3048                 paddr &= GENMASK_ULL(51, 12);
3049                 if (WARN_ON(gic_rdists->prop_table_pa != paddr))
3050                         add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
3051
3052                 paddr = gicr_read_pendbaser(rbase + GICR_PENDBASER);
3053                 paddr &= GENMASK_ULL(51, 16);
3054
3055                 WARN_ON(!gic_check_reserved_range(paddr, LPI_PENDBASE_SZ));
3056                 its_free_pending_table(gic_data_rdist()->pend_page);
3057                 gic_data_rdist()->pend_page = NULL;
3058
3059                 goto out;
3060         }
3061
3062         pend_page = gic_data_rdist()->pend_page;
3063         paddr = page_to_phys(pend_page);
3064         WARN_ON(gic_reserve_range(paddr, LPI_PENDBASE_SZ));
3065
3066         /* set PROPBASE */
3067         val = (gic_rdists->prop_table_pa |
3068                GICR_PROPBASER_InnerShareable |
3069                GICR_PROPBASER_RaWaWb |
3070                ((LPI_NRBITS - 1) & GICR_PROPBASER_IDBITS_MASK));
3071
3072         gicr_write_propbaser(val, rbase + GICR_PROPBASER);
3073         tmp = gicr_read_propbaser(rbase + GICR_PROPBASER);
3074
3075         if ((tmp ^ val) & GICR_PROPBASER_SHAREABILITY_MASK) {
3076                 if (!(tmp & GICR_PROPBASER_SHAREABILITY_MASK)) {
3077                         /*
3078                          * The HW reports non-shareable, we must
3079                          * remove the cacheability attributes as
3080                          * well.
3081                          */
3082                         val &= ~(GICR_PROPBASER_SHAREABILITY_MASK |
3083                                  GICR_PROPBASER_CACHEABILITY_MASK);
3084                         val |= GICR_PROPBASER_nC;
3085                         gicr_write_propbaser(val, rbase + GICR_PROPBASER);
3086                 }
3087                 pr_info_once("GIC: using cache flushing for LPI property table\n");
3088                 gic_rdists->flags |= RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING;
3089         }
3090
3091         /* set PENDBASE */
3092         val = (page_to_phys(pend_page) |
3093                GICR_PENDBASER_InnerShareable |
3094                GICR_PENDBASER_RaWaWb);
3095
3096         gicr_write_pendbaser(val, rbase + GICR_PENDBASER);
3097         tmp = gicr_read_pendbaser(rbase + GICR_PENDBASER);
3098
3099         if (!(tmp & GICR_PENDBASER_SHAREABILITY_MASK)) {
3100                 /*
3101                  * The HW reports non-shareable, we must remove the
3102                  * cacheability attributes as well.
3103                  */
3104                 val &= ~(GICR_PENDBASER_SHAREABILITY_MASK |
3105                          GICR_PENDBASER_CACHEABILITY_MASK);
3106                 val |= GICR_PENDBASER_nC;
3107                 gicr_write_pendbaser(val, rbase + GICR_PENDBASER);
3108         }
3109
3110         /* Enable LPIs */
3111         val = readl_relaxed(rbase + GICR_CTLR);
3112         val |= GICR_CTLR_ENABLE_LPIS;
3113         writel_relaxed(val, rbase + GICR_CTLR);
3114
3115         if (gic_rdists->has_vlpis && !gic_rdists->has_rvpeid) {
3116                 void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
3117
3118                 /*
3119                  * It's possible for CPU to receive VLPIs before it is
3120                  * sheduled as a vPE, especially for the first CPU, and the
3121                  * VLPI with INTID larger than 2^(IDbits+1) will be considered
3122                  * as out of range and dropped by GIC.
3123                  * So we initialize IDbits to known value to avoid VLPI drop.
3124                  */
3125                 val = (LPI_NRBITS - 1) & GICR_VPROPBASER_IDBITS_MASK;
3126                 pr_debug("GICv4: CPU%d: Init IDbits to 0x%llx for GICR_VPROPBASER\n",
3127                         smp_processor_id(), val);
3128                 gicr_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
3129
3130                 /*
3131                  * Also clear Valid bit of GICR_VPENDBASER, in case some
3132                  * ancient programming gets left in and has possibility of
3133                  * corrupting memory.
3134                  */
3135                 val = its_clear_vpend_valid(vlpi_base, 0, 0);
3136         }
3137
3138         if (allocate_vpe_l1_table()) {
3139                 /*
3140                  * If the allocation has failed, we're in massive trouble.
3141                  * Disable direct injection, and pray that no VM was
3142                  * already running...
3143                  */
3144                 gic_rdists->has_rvpeid = false;
3145                 gic_rdists->has_vlpis = false;
3146         }
3147
3148         /* Make sure the GIC has seen the above */
3149         dsb(sy);
3150 out:
3151         gic_data_rdist()->lpi_enabled = true;
3152         pr_info("GICv3: CPU%d: using %s LPI pending table @%pa\n",
3153                 smp_processor_id(),
3154                 gic_data_rdist()->pend_page ? "allocated" : "reserved",
3155                 &paddr);
3156 }
3157
3158 static void its_cpu_init_collection(struct its_node *its)
3159 {
3160         int cpu = smp_processor_id();
3161         u64 target;
3162
3163         /* avoid cross node collections and its mapping */
3164         if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) {
3165                 struct device_node *cpu_node;
3166
3167                 cpu_node = of_get_cpu_node(cpu, NULL);
3168                 if (its->numa_node != NUMA_NO_NODE &&
3169                         its->numa_node != of_node_to_nid(cpu_node))
3170                         return;
3171         }
3172
3173         /*
3174          * We now have to bind each collection to its target
3175          * redistributor.
3176          */
3177         if (gic_read_typer(its->base + GITS_TYPER) & GITS_TYPER_PTA) {
3178                 /*
3179                  * This ITS wants the physical address of the
3180                  * redistributor.
3181                  */
3182                 target = gic_data_rdist()->phys_base;
3183         } else {
3184                 /* This ITS wants a linear CPU number. */
3185                 target = gic_read_typer(gic_data_rdist_rd_base() + GICR_TYPER);
3186                 target = GICR_TYPER_CPU_NUMBER(target) << 16;
3187         }
3188
3189         /* Perform collection mapping */
3190         its->collections[cpu].target_address = target;
3191         its->collections[cpu].col_id = cpu;
3192
3193         its_send_mapc(its, &its->collections[cpu], 1);
3194         its_send_invall(its, &its->collections[cpu]);
3195 }
3196
3197 static void its_cpu_init_collections(void)
3198 {
3199         struct its_node *its;
3200
3201         raw_spin_lock(&its_lock);
3202
3203         list_for_each_entry(its, &its_nodes, entry)
3204                 its_cpu_init_collection(its);
3205
3206         raw_spin_unlock(&its_lock);
3207 }
3208
3209 static struct its_device *its_find_device(struct its_node *its, u32 dev_id)
3210 {
3211         struct its_device *its_dev = NULL, *tmp;
3212         unsigned long flags;
3213
3214         raw_spin_lock_irqsave(&its->lock, flags);
3215
3216         list_for_each_entry(tmp, &its->its_device_list, entry) {
3217                 if (tmp->device_id == dev_id) {
3218                         its_dev = tmp;
3219                         break;
3220                 }
3221         }
3222
3223         raw_spin_unlock_irqrestore(&its->lock, flags);
3224
3225         return its_dev;
3226 }
3227
3228 static struct its_baser *its_get_baser(struct its_node *its, u32 type)
3229 {
3230         int i;
3231
3232         for (i = 0; i < GITS_BASER_NR_REGS; i++) {
3233                 if (GITS_BASER_TYPE(its->tables[i].val) == type)
3234                         return &its->tables[i];
3235         }
3236
3237         return NULL;
3238 }
3239
3240 static bool its_alloc_table_entry(struct its_node *its,
3241                                   struct its_baser *baser, u32 id)
3242 {
3243         struct page *page;
3244         u32 esz, idx;
3245         __le64 *table;
3246
3247         /* Don't allow device id that exceeds single, flat table limit */
3248         esz = GITS_BASER_ENTRY_SIZE(baser->val);
3249         if (!(baser->val & GITS_BASER_INDIRECT))
3250                 return (id < (PAGE_ORDER_TO_SIZE(baser->order) / esz));
3251
3252         /* Compute 1st level table index & check if that exceeds table limit */
3253         idx = id >> ilog2(baser->psz / esz);
3254         if (idx >= (PAGE_ORDER_TO_SIZE(baser->order) / GITS_LVL1_ENTRY_SIZE))
3255                 return false;
3256
3257         table = baser->base;
3258
3259         /* Allocate memory for 2nd level table */
3260         if (!table[idx]) {
3261                 page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
3262                                         get_order(baser->psz));
3263                 if (!page)
3264                         return false;
3265
3266                 /* Flush Lvl2 table to PoC if hw doesn't support coherency */
3267                 if (!(baser->val & GITS_BASER_SHAREABILITY_MASK))
3268                         gic_flush_dcache_to_poc(page_address(page), baser->psz);
3269
3270                 table[idx] = cpu_to_le64(page_to_phys(page) | GITS_BASER_VALID);
3271
3272                 /* Flush Lvl1 entry to PoC if hw doesn't support coherency */
3273                 if (!(baser->val & GITS_BASER_SHAREABILITY_MASK))
3274                         gic_flush_dcache_to_poc(table + idx, GITS_LVL1_ENTRY_SIZE);
3275
3276                 /* Ensure updated table contents are visible to ITS hardware */
3277                 dsb(sy);
3278         }
3279
3280         return true;
3281 }
3282
3283 static bool its_alloc_device_table(struct its_node *its, u32 dev_id)
3284 {
3285         struct its_baser *baser;
3286
3287         baser = its_get_baser(its, GITS_BASER_TYPE_DEVICE);
3288
3289         /* Don't allow device id that exceeds ITS hardware limit */
3290         if (!baser)
3291                 return (ilog2(dev_id) < device_ids(its));
3292
3293         return its_alloc_table_entry(its, baser, dev_id);
3294 }
3295
3296 static bool its_alloc_vpe_table(u32 vpe_id)
3297 {
3298         struct its_node *its;
3299         int cpu;
3300
3301         /*
3302          * Make sure the L2 tables are allocated on *all* v4 ITSs. We
3303          * could try and only do it on ITSs corresponding to devices
3304          * that have interrupts targeted at this VPE, but the
3305          * complexity becomes crazy (and you have tons of memory
3306          * anyway, right?).
3307          */
3308         list_for_each_entry(its, &its_nodes, entry) {
3309                 struct its_baser *baser;
3310
3311                 if (!is_v4(its))
3312                         continue;
3313
3314                 baser = its_get_baser(its, GITS_BASER_TYPE_VCPU);
3315                 if (!baser)
3316                         return false;
3317
3318                 if (!its_alloc_table_entry(its, baser, vpe_id))
3319                         return false;
3320         }
3321
3322         /* Non v4.1? No need to iterate RDs and go back early. */
3323         if (!gic_rdists->has_rvpeid)
3324                 return true;
3325
3326         /*
3327          * Make sure the L2 tables are allocated for all copies of
3328          * the L1 table on *all* v4.1 RDs.
3329          */
3330         for_each_possible_cpu(cpu) {
3331                 if (!allocate_vpe_l2_table(cpu, vpe_id))
3332                         return false;
3333         }
3334
3335         return true;
3336 }
3337
3338 static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
3339                                             int nvecs, bool alloc_lpis)
3340 {
3341         struct its_device *dev;
3342         unsigned long *lpi_map = NULL;
3343         unsigned long flags;
3344         u16 *col_map = NULL;
3345         void *itt;
3346         int lpi_base;
3347         int nr_lpis;
3348         int nr_ites;
3349         int sz;
3350
3351         if (!its_alloc_device_table(its, dev_id))
3352                 return NULL;
3353
3354         if (WARN_ON(!is_power_of_2(nvecs)))
3355                 nvecs = roundup_pow_of_two(nvecs);
3356
3357         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3358         /*
3359          * Even if the device wants a single LPI, the ITT must be
3360          * sized as a power of two (and you need at least one bit...).
3361          */
3362         nr_ites = max(2, nvecs);
3363         sz = nr_ites * (FIELD_GET(GITS_TYPER_ITT_ENTRY_SIZE, its->typer) + 1);
3364         sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
3365         itt = kzalloc_node(sz, GFP_KERNEL, its->numa_node);
3366         if (alloc_lpis) {
3367                 lpi_map = its_lpi_alloc(nvecs, &lpi_base, &nr_lpis);
3368                 if (lpi_map)
3369                         col_map = kcalloc(nr_lpis, sizeof(*col_map),
3370                                           GFP_KERNEL);
3371         } else {
3372                 col_map = kcalloc(nr_ites, sizeof(*col_map), GFP_KERNEL);
3373                 nr_lpis = 0;
3374                 lpi_base = 0;
3375         }
3376
3377         if (!dev || !itt ||  !col_map || (!lpi_map && alloc_lpis)) {
3378                 kfree(dev);
3379                 kfree(itt);
3380                 kfree(lpi_map);
3381                 kfree(col_map);
3382                 return NULL;
3383         }
3384
3385         gic_flush_dcache_to_poc(itt, sz);
3386
3387         dev->its = its;
3388         dev->itt = itt;
3389         dev->nr_ites = nr_ites;
3390         dev->event_map.lpi_map = lpi_map;
3391         dev->event_map.col_map = col_map;
3392         dev->event_map.lpi_base = lpi_base;
3393         dev->event_map.nr_lpis = nr_lpis;
3394         raw_spin_lock_init(&dev->event_map.vlpi_lock);
3395         dev->device_id = dev_id;
3396         INIT_LIST_HEAD(&dev->entry);
3397
3398         raw_spin_lock_irqsave(&its->lock, flags);
3399         list_add(&dev->entry, &its->its_device_list);
3400         raw_spin_unlock_irqrestore(&its->lock, flags);
3401
3402         /* Map device to its ITT */
3403         its_send_mapd(dev, 1);
3404
3405         return dev;
3406 }
3407
3408 static void its_free_device(struct its_device *its_dev)
3409 {
3410         unsigned long flags;
3411
3412         raw_spin_lock_irqsave(&its_dev->its->lock, flags);
3413         list_del(&its_dev->entry);
3414         raw_spin_unlock_irqrestore(&its_dev->its->lock, flags);
3415         kfree(its_dev->event_map.col_map);
3416         kfree(its_dev->itt);
3417         kfree(its_dev);
3418 }
3419
3420 static int its_alloc_device_irq(struct its_device *dev, int nvecs, irq_hw_number_t *hwirq)
3421 {
3422         int idx;
3423
3424         /* Find a free LPI region in lpi_map and allocate them. */
3425         idx = bitmap_find_free_region(dev->event_map.lpi_map,
3426                                       dev->event_map.nr_lpis,
3427                                       get_count_order(nvecs));
3428         if (idx < 0)
3429                 return -ENOSPC;
3430
3431         *hwirq = dev->event_map.lpi_base + idx;
3432
3433         return 0;
3434 }
3435
3436 static int its_msi_prepare(struct irq_domain *domain, struct device *dev,
3437                            int nvec, msi_alloc_info_t *info)
3438 {
3439         struct its_node *its;
3440         struct its_device *its_dev;
3441         struct msi_domain_info *msi_info;
3442         u32 dev_id;
3443         int err = 0;
3444
3445         /*
3446          * We ignore "dev" entirely, and rely on the dev_id that has
3447          * been passed via the scratchpad. This limits this domain's
3448          * usefulness to upper layers that definitely know that they
3449          * are built on top of the ITS.
3450          */
3451         dev_id = info->scratchpad[0].ul;
3452
3453         msi_info = msi_get_domain_info(domain);
3454         its = msi_info->data;
3455
3456         if (!gic_rdists->has_direct_lpi &&
3457             vpe_proxy.dev &&
3458             vpe_proxy.dev->its == its &&
3459             dev_id == vpe_proxy.dev->device_id) {
3460                 /* Bad luck. Get yourself a better implementation */
3461                 WARN_ONCE(1, "DevId %x clashes with GICv4 VPE proxy device\n",
3462                           dev_id);
3463                 return -EINVAL;
3464         }
3465
3466         mutex_lock(&its->dev_alloc_lock);
3467         its_dev = its_find_device(its, dev_id);
3468         if (its_dev) {
3469                 /*
3470                  * We already have seen this ID, probably through
3471                  * another alias (PCI bridge of some sort). No need to
3472                  * create the device.
3473                  */
3474                 its_dev->shared = true;
3475                 pr_debug("Reusing ITT for devID %x\n", dev_id);
3476                 goto out;
3477         }
3478
3479         its_dev = its_create_device(its, dev_id, nvec, true);
3480         if (!its_dev) {
3481                 err = -ENOMEM;
3482                 goto out;
3483         }
3484
3485         pr_debug("ITT %d entries, %d bits\n", nvec, ilog2(nvec));
3486 out:
3487         mutex_unlock(&its->dev_alloc_lock);
3488         info->scratchpad[0].ptr = its_dev;
3489         return err;
3490 }
3491
3492 static struct msi_domain_ops its_msi_domain_ops = {
3493         .msi_prepare    = its_msi_prepare,
3494 };
3495
3496 static int its_irq_gic_domain_alloc(struct irq_domain *domain,
3497                                     unsigned int virq,
3498                                     irq_hw_number_t hwirq)
3499 {
3500         struct irq_fwspec fwspec;
3501
3502         if (irq_domain_get_of_node(domain->parent)) {
3503                 fwspec.fwnode = domain->parent->fwnode;
3504                 fwspec.param_count = 3;
3505                 fwspec.param[0] = GIC_IRQ_TYPE_LPI;
3506                 fwspec.param[1] = hwirq;
3507                 fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
3508         } else if (is_fwnode_irqchip(domain->parent->fwnode)) {
3509                 fwspec.fwnode = domain->parent->fwnode;
3510                 fwspec.param_count = 2;
3511                 fwspec.param[0] = hwirq;
3512                 fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
3513         } else {
3514                 return -EINVAL;
3515         }
3516
3517         return irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
3518 }
3519
3520 static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
3521                                 unsigned int nr_irqs, void *args)
3522 {
3523         msi_alloc_info_t *info = args;
3524         struct its_device *its_dev = info->scratchpad[0].ptr;
3525         struct its_node *its = its_dev->its;
3526         irq_hw_number_t hwirq;
3527         int err;
3528         int i;
3529
3530         err = its_alloc_device_irq(its_dev, nr_irqs, &hwirq);
3531         if (err)
3532                 return err;
3533
3534         err = iommu_dma_prepare_msi(info->desc, its->get_msi_base(its_dev));
3535         if (err)
3536                 return err;
3537
3538         for (i = 0; i < nr_irqs; i++) {
3539                 err = its_irq_gic_domain_alloc(domain, virq + i, hwirq + i);
3540                 if (err)
3541                         return err;
3542
3543                 irq_domain_set_hwirq_and_chip(domain, virq + i,
3544                                               hwirq + i, &its_irq_chip, its_dev);
3545                 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq + i)));
3546                 pr_debug("ID:%d pID:%d vID:%d\n",
3547                          (int)(hwirq + i - its_dev->event_map.lpi_base),
3548                          (int)(hwirq + i), virq + i);
3549         }
3550
3551         return 0;
3552 }
3553
3554 static int its_irq_domain_activate(struct irq_domain *domain,
3555                                    struct irq_data *d, bool reserve)
3556 {
3557         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
3558         u32 event = its_get_event_id(d);
3559         int cpu;
3560
3561         cpu = its_select_cpu(d, cpu_online_mask);
3562         if (cpu < 0 || cpu >= nr_cpu_ids)
3563                 return -EINVAL;
3564
3565         its_inc_lpi_count(d, cpu);
3566         its_dev->event_map.col_map[event] = cpu;
3567         irq_data_update_effective_affinity(d, cpumask_of(cpu));
3568
3569         /* Map the GIC IRQ and event to the device */
3570         its_send_mapti(its_dev, d->hwirq, event);
3571         return 0;
3572 }
3573
3574 static void its_irq_domain_deactivate(struct irq_domain *domain,
3575                                       struct irq_data *d)
3576 {
3577         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
3578         u32 event = its_get_event_id(d);
3579
3580         its_dec_lpi_count(d, its_dev->event_map.col_map[event]);
3581         /* Stop the delivery of interrupts */
3582         its_send_discard(its_dev, event);
3583 }
3584
3585 static void its_irq_domain_free(struct irq_domain *domain, unsigned int virq,
3586                                 unsigned int nr_irqs)
3587 {
3588         struct irq_data *d = irq_domain_get_irq_data(domain, virq);
3589         struct its_device *its_dev = irq_data_get_irq_chip_data(d);
3590         struct its_node *its = its_dev->its;
3591         int i;
3592
3593         bitmap_release_region(its_dev->event_map.lpi_map,
3594                               its_get_event_id(irq_domain_get_irq_data(domain, virq)),
3595                               get_count_order(nr_irqs));
3596
3597         for (i = 0; i < nr_irqs; i++) {
3598                 struct irq_data *data = irq_domain_get_irq_data(domain,
3599                                                                 virq + i);
3600                 /* Nuke the entry in the domain */
3601                 irq_domain_reset_irq_data(data);
3602         }
3603
3604         mutex_lock(&its->dev_alloc_lock);
3605
3606         /*
3607          * If all interrupts have been freed, start mopping the
3608          * floor. This is conditionned on the device not being shared.
3609          */
3610         if (!its_dev->shared &&
3611             bitmap_empty(its_dev->event_map.lpi_map,
3612                          its_dev->event_map.nr_lpis)) {
3613                 its_lpi_free(its_dev->event_map.lpi_map,
3614                              its_dev->event_map.lpi_base,
3615                              its_dev->event_map.nr_lpis);
3616
3617                 /* Unmap device/itt */
3618                 its_send_mapd(its_dev, 0);
3619                 its_free_device(its_dev);
3620         }
3621
3622         mutex_unlock(&its->dev_alloc_lock);
3623
3624         irq_domain_free_irqs_parent(domain, virq, nr_irqs);
3625 }
3626
3627 static const struct irq_domain_ops its_domain_ops = {
3628         .alloc                  = its_irq_domain_alloc,
3629         .free                   = its_irq_domain_free,
3630         .activate               = its_irq_domain_activate,
3631         .deactivate             = its_irq_domain_deactivate,
3632 };
3633
3634 /*
3635  * This is insane.
3636  *
3637  * If a GICv4.0 doesn't implement Direct LPIs (which is extremely
3638  * likely), the only way to perform an invalidate is to use a fake
3639  * device to issue an INV command, implying that the LPI has first
3640  * been mapped to some event on that device. Since this is not exactly
3641  * cheap, we try to keep that mapping around as long as possible, and
3642  * only issue an UNMAP if we're short on available slots.
3643  *
3644  * Broken by design(tm).
3645  *
3646  * GICv4.1, on the other hand, mandates that we're able to invalidate
3647  * by writing to a MMIO register. It doesn't implement the whole of
3648  * DirectLPI, but that's good enough. And most of the time, we don't
3649  * even have to invalidate anything, as the redistributor can be told
3650  * whether to generate a doorbell or not (we thus leave it enabled,
3651  * always).
3652  */
3653 static void its_vpe_db_proxy_unmap_locked(struct its_vpe *vpe)
3654 {
3655         /* GICv4.1 doesn't use a proxy, so nothing to do here */
3656         if (gic_rdists->has_rvpeid)
3657                 return;
3658
3659         /* Already unmapped? */
3660         if (vpe->vpe_proxy_event == -1)
3661                 return;
3662
3663         its_send_discard(vpe_proxy.dev, vpe->vpe_proxy_event);
3664         vpe_proxy.vpes[vpe->vpe_proxy_event] = NULL;
3665
3666         /*
3667          * We don't track empty slots at all, so let's move the
3668          * next_victim pointer if we can quickly reuse that slot
3669          * instead of nuking an existing entry. Not clear that this is
3670          * always a win though, and this might just generate a ripple
3671          * effect... Let's just hope VPEs don't migrate too often.
3672          */
3673         if (vpe_proxy.vpes[vpe_proxy.next_victim])
3674                 vpe_proxy.next_victim = vpe->vpe_proxy_event;
3675
3676         vpe->vpe_proxy_event = -1;
3677 }
3678
3679 static void its_vpe_db_proxy_unmap(struct its_vpe *vpe)
3680 {
3681         /* GICv4.1 doesn't use a proxy, so nothing to do here */
3682         if (gic_rdists->has_rvpeid)
3683                 return;
3684
3685         if (!gic_rdists->has_direct_lpi) {
3686                 unsigned long flags;
3687
3688                 raw_spin_lock_irqsave(&vpe_proxy.lock, flags);
3689                 its_vpe_db_proxy_unmap_locked(vpe);
3690                 raw_spin_unlock_irqrestore(&vpe_proxy.lock, flags);
3691         }
3692 }
3693
3694 static void its_vpe_db_proxy_map_locked(struct its_vpe *vpe)
3695 {
3696         /* GICv4.1 doesn't use a proxy, so nothing to do here */
3697         if (gic_rdists->has_rvpeid)
3698                 return;
3699
3700         /* Already mapped? */
3701         if (vpe->vpe_proxy_event != -1)
3702                 return;
3703
3704         /* This slot was already allocated. Kick the other VPE out. */
3705         if (vpe_proxy.vpes[vpe_proxy.next_victim])
3706                 its_vpe_db_proxy_unmap_locked(vpe_proxy.vpes[vpe_proxy.next_victim]);
3707
3708         /* Map the new VPE instead */
3709         vpe_proxy.vpes[vpe_proxy.next_victim] = vpe;
3710         vpe->vpe_proxy_event = vpe_proxy.next_victim;
3711         vpe_proxy.next_victim = (vpe_proxy.next_victim + 1) % vpe_proxy.dev->nr_ites;
3712
3713         vpe_proxy.dev->event_map.col_map[vpe->vpe_proxy_event] = vpe->col_idx;
3714         its_send_mapti(vpe_proxy.dev, vpe->vpe_db_lpi, vpe->vpe_proxy_event);
3715 }
3716
3717 static void its_vpe_db_proxy_move(struct its_vpe *vpe, int from, int to)
3718 {
3719         unsigned long flags;
3720         struct its_collection *target_col;
3721
3722         /* GICv4.1 doesn't use a proxy, so nothing to do here */
3723         if (gic_rdists->has_rvpeid)
3724                 return;
3725
3726         if (gic_rdists->has_direct_lpi) {
3727                 void __iomem *rdbase;
3728
3729                 rdbase = per_cpu_ptr(gic_rdists->rdist, from)->rd_base;
3730                 gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR);
3731                 wait_for_syncr(rdbase);
3732
3733                 return;
3734         }
3735
3736         raw_spin_lock_irqsave(&vpe_proxy.lock, flags);
3737
3738         its_vpe_db_proxy_map_locked(vpe);
3739
3740         target_col = &vpe_proxy.dev->its->collections[to];
3741         its_send_movi(vpe_proxy.dev, target_col, vpe->vpe_proxy_event);
3742         vpe_proxy.dev->event_map.col_map[vpe->vpe_proxy_event] = to;
3743
3744         raw_spin_unlock_irqrestore(&vpe_proxy.lock, flags);
3745 }
3746
3747 static int its_vpe_set_affinity(struct irq_data *d,
3748                                 const struct cpumask *mask_val,
3749                                 bool force)
3750 {
3751         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
3752         int from, cpu = cpumask_first(mask_val);
3753         unsigned long flags;
3754
3755         /*
3756          * Changing affinity is mega expensive, so let's be as lazy as
3757          * we can and only do it if we really have to. Also, if mapped
3758          * into the proxy device, we need to move the doorbell
3759          * interrupt to its new location.
3760          *
3761          * Another thing is that changing the affinity of a vPE affects
3762          * *other interrupts* such as all the vLPIs that are routed to
3763          * this vPE. This means that the irq_desc lock is not enough to
3764          * protect us, and that we must ensure nobody samples vpe->col_idx
3765          * during the update, hence the lock below which must also be
3766          * taken on any vLPI handling path that evaluates vpe->col_idx.
3767          */
3768         from = vpe_to_cpuid_lock(vpe, &flags);
3769         if (from == cpu)
3770                 goto out;
3771
3772         vpe->col_idx = cpu;
3773
3774         /*
3775          * GICv4.1 allows us to skip VMOVP if moving to a cpu whose RD
3776          * is sharing its VPE table with the current one.
3777          */
3778         if (gic_data_rdist_cpu(cpu)->vpe_table_mask &&
3779             cpumask_test_cpu(from, gic_data_rdist_cpu(cpu)->vpe_table_mask))
3780                 goto out;
3781
3782         its_send_vmovp(vpe);
3783         its_vpe_db_proxy_move(vpe, from, cpu);
3784
3785 out:
3786         irq_data_update_effective_affinity(d, cpumask_of(cpu));
3787         vpe_to_cpuid_unlock(vpe, flags);
3788
3789         return IRQ_SET_MASK_OK_DONE;
3790 }
3791
3792 static void its_wait_vpt_parse_complete(void)
3793 {
3794         void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
3795         u64 val;
3796
3797         if (!gic_rdists->has_vpend_valid_dirty)
3798                 return;
3799
3800         WARN_ON_ONCE(readq_relaxed_poll_timeout_atomic(vlpi_base + GICR_VPENDBASER,
3801                                                        val,
3802                                                        !(val & GICR_VPENDBASER_Dirty),
3803                                                        10, 500));
3804 }
3805
3806 static void its_vpe_schedule(struct its_vpe *vpe)
3807 {
3808         void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
3809         u64 val;
3810
3811         /* Schedule the VPE */
3812         val  = virt_to_phys(page_address(vpe->its_vm->vprop_page)) &
3813                 GENMASK_ULL(51, 12);
3814         val |= (LPI_NRBITS - 1) & GICR_VPROPBASER_IDBITS_MASK;
3815         val |= GICR_VPROPBASER_RaWb;
3816         val |= GICR_VPROPBASER_InnerShareable;
3817         gicr_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
3818
3819         val  = virt_to_phys(page_address(vpe->vpt_page)) &
3820                 GENMASK_ULL(51, 16);
3821         val |= GICR_VPENDBASER_RaWaWb;
3822         val |= GICR_VPENDBASER_InnerShareable;
3823         /*
3824          * There is no good way of finding out if the pending table is
3825          * empty as we can race against the doorbell interrupt very
3826          * easily. So in the end, vpe->pending_last is only an
3827          * indication that the vcpu has something pending, not one
3828          * that the pending table is empty. A good implementation
3829          * would be able to read its coarse map pretty quickly anyway,
3830          * making this a tolerable issue.
3831          */
3832         val |= GICR_VPENDBASER_PendingLast;
3833         val |= vpe->idai ? GICR_VPENDBASER_IDAI : 0;
3834         val |= GICR_VPENDBASER_Valid;
3835         gicr_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
3836
3837         its_wait_vpt_parse_complete();
3838 }
3839
3840 static void its_vpe_deschedule(struct its_vpe *vpe)
3841 {
3842         void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
3843         u64 val;
3844
3845         val = its_clear_vpend_valid(vlpi_base, 0, 0);
3846
3847         vpe->idai = !!(val & GICR_VPENDBASER_IDAI);
3848         vpe->pending_last = !!(val & GICR_VPENDBASER_PendingLast);
3849 }
3850
3851 static void its_vpe_invall(struct its_vpe *vpe)
3852 {
3853         struct its_node *its;
3854
3855         list_for_each_entry(its, &its_nodes, entry) {
3856                 if (!is_v4(its))
3857                         continue;
3858
3859                 if (its_list_map && !vpe->its_vm->vlpi_count[its->list_nr])
3860                         continue;
3861
3862                 /*
3863                  * Sending a VINVALL to a single ITS is enough, as all
3864                  * we need is to reach the redistributors.
3865                  */
3866                 its_send_vinvall(its, vpe);
3867                 return;
3868         }
3869 }
3870
3871 static int its_vpe_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
3872 {
3873         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
3874         struct its_cmd_info *info = vcpu_info;
3875
3876         switch (info->cmd_type) {
3877         case SCHEDULE_VPE:
3878                 its_vpe_schedule(vpe);
3879                 return 0;
3880
3881         case DESCHEDULE_VPE:
3882                 its_vpe_deschedule(vpe);
3883                 return 0;
3884
3885         case INVALL_VPE:
3886                 its_vpe_invall(vpe);
3887                 return 0;
3888
3889         default:
3890                 return -EINVAL;
3891         }
3892 }
3893
3894 static void its_vpe_send_cmd(struct its_vpe *vpe,
3895                              void (*cmd)(struct its_device *, u32))
3896 {
3897         unsigned long flags;
3898
3899         raw_spin_lock_irqsave(&vpe_proxy.lock, flags);
3900
3901         its_vpe_db_proxy_map_locked(vpe);
3902         cmd(vpe_proxy.dev, vpe->vpe_proxy_event);
3903
3904         raw_spin_unlock_irqrestore(&vpe_proxy.lock, flags);
3905 }
3906
3907 static void its_vpe_send_inv(struct irq_data *d)
3908 {
3909         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
3910
3911         if (gic_rdists->has_direct_lpi) {
3912                 void __iomem *rdbase;
3913
3914                 /* Target the redistributor this VPE is currently known on */
3915                 raw_spin_lock(&gic_data_rdist_cpu(vpe->col_idx)->rd_lock);
3916                 rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
3917                 gic_write_lpir(d->parent_data->hwirq, rdbase + GICR_INVLPIR);
3918                 wait_for_syncr(rdbase);
3919                 raw_spin_unlock(&gic_data_rdist_cpu(vpe->col_idx)->rd_lock);
3920         } else {
3921                 its_vpe_send_cmd(vpe, its_send_inv);
3922         }
3923 }
3924
3925 static void its_vpe_mask_irq(struct irq_data *d)
3926 {
3927         /*
3928          * We need to unmask the LPI, which is described by the parent
3929          * irq_data. Instead of calling into the parent (which won't
3930          * exactly do the right thing, let's simply use the
3931          * parent_data pointer. Yes, I'm naughty.
3932          */
3933         lpi_write_config(d->parent_data, LPI_PROP_ENABLED, 0);
3934         its_vpe_send_inv(d);
3935 }
3936
3937 static void its_vpe_unmask_irq(struct irq_data *d)
3938 {
3939         /* Same hack as above... */
3940         lpi_write_config(d->parent_data, 0, LPI_PROP_ENABLED);
3941         its_vpe_send_inv(d);
3942 }
3943
3944 static int its_vpe_set_irqchip_state(struct irq_data *d,
3945                                      enum irqchip_irq_state which,
3946                                      bool state)
3947 {
3948         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
3949
3950         if (which != IRQCHIP_STATE_PENDING)
3951                 return -EINVAL;
3952
3953         if (gic_rdists->has_direct_lpi) {
3954                 void __iomem *rdbase;
3955
3956                 rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
3957                 if (state) {
3958                         gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_SETLPIR);
3959                 } else {
3960                         gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR);
3961                         wait_for_syncr(rdbase);
3962                 }
3963         } else {
3964                 if (state)
3965                         its_vpe_send_cmd(vpe, its_send_int);
3966                 else
3967                         its_vpe_send_cmd(vpe, its_send_clear);
3968         }
3969
3970         return 0;
3971 }
3972
3973 static int its_vpe_retrigger(struct irq_data *d)
3974 {
3975         return !its_vpe_set_irqchip_state(d, IRQCHIP_STATE_PENDING, true);
3976 }
3977
3978 static struct irq_chip its_vpe_irq_chip = {
3979         .name                   = "GICv4-vpe",
3980         .irq_mask               = its_vpe_mask_irq,
3981         .irq_unmask             = its_vpe_unmask_irq,
3982         .irq_eoi                = irq_chip_eoi_parent,
3983         .irq_set_affinity       = its_vpe_set_affinity,
3984         .irq_retrigger          = its_vpe_retrigger,
3985         .irq_set_irqchip_state  = its_vpe_set_irqchip_state,
3986         .irq_set_vcpu_affinity  = its_vpe_set_vcpu_affinity,
3987 };
3988
3989 static struct its_node *find_4_1_its(void)
3990 {
3991         static struct its_node *its = NULL;
3992
3993         if (!its) {
3994                 list_for_each_entry(its, &its_nodes, entry) {
3995                         if (is_v4_1(its))
3996                                 return its;
3997                 }
3998
3999                 /* Oops? */
4000                 its = NULL;
4001         }
4002
4003         return its;
4004 }
4005
4006 static void its_vpe_4_1_send_inv(struct irq_data *d)
4007 {
4008         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4009         struct its_node *its;
4010
4011         /*
4012          * GICv4.1 wants doorbells to be invalidated using the
4013          * INVDB command in order to be broadcast to all RDs. Send
4014          * it to the first valid ITS, and let the HW do its magic.
4015          */
4016         its = find_4_1_its();
4017         if (its)
4018                 its_send_invdb(its, vpe);
4019 }
4020
4021 static void its_vpe_4_1_mask_irq(struct irq_data *d)
4022 {
4023         lpi_write_config(d->parent_data, LPI_PROP_ENABLED, 0);
4024         its_vpe_4_1_send_inv(d);
4025 }
4026
4027 static void its_vpe_4_1_unmask_irq(struct irq_data *d)
4028 {
4029         lpi_write_config(d->parent_data, 0, LPI_PROP_ENABLED);
4030         its_vpe_4_1_send_inv(d);
4031 }
4032
4033 static void its_vpe_4_1_schedule(struct its_vpe *vpe,
4034                                  struct its_cmd_info *info)
4035 {
4036         void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
4037         u64 val = 0;
4038
4039         /* Schedule the VPE */
4040         val |= GICR_VPENDBASER_Valid;
4041         val |= info->g0en ? GICR_VPENDBASER_4_1_VGRP0EN : 0;
4042         val |= info->g1en ? GICR_VPENDBASER_4_1_VGRP1EN : 0;
4043         val |= FIELD_PREP(GICR_VPENDBASER_4_1_VPEID, vpe->vpe_id);
4044
4045         gicr_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
4046
4047         its_wait_vpt_parse_complete();
4048 }
4049
4050 static void its_vpe_4_1_deschedule(struct its_vpe *vpe,
4051                                    struct its_cmd_info *info)
4052 {
4053         void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
4054         u64 val;
4055
4056         if (info->req_db) {
4057                 /*
4058                  * vPE is going to block: make the vPE non-resident with
4059                  * PendingLast clear and DB set. The GIC guarantees that if
4060                  * we read-back PendingLast clear, then a doorbell will be
4061                  * delivered when an interrupt comes.
4062                  */
4063                 val = its_clear_vpend_valid(vlpi_base,
4064                                             GICR_VPENDBASER_PendingLast,
4065                                             GICR_VPENDBASER_4_1_DB);
4066                 vpe->pending_last = !!(val & GICR_VPENDBASER_PendingLast);
4067         } else {
4068                 /*
4069                  * We're not blocking, so just make the vPE non-resident
4070                  * with PendingLast set, indicating that we'll be back.
4071                  */
4072                 val = its_clear_vpend_valid(vlpi_base,
4073                                             0,
4074                                             GICR_VPENDBASER_PendingLast);
4075                 vpe->pending_last = true;
4076         }
4077 }
4078
4079 static void its_vpe_4_1_invall(struct its_vpe *vpe)
4080 {
4081         void __iomem *rdbase;
4082         u64 val;
4083
4084         val  = GICR_INVALLR_V;
4085         val |= FIELD_PREP(GICR_INVALLR_VPEID, vpe->vpe_id);
4086
4087         /* Target the redistributor this vPE is currently known on */
4088         raw_spin_lock(&gic_data_rdist_cpu(vpe->col_idx)->rd_lock);
4089         rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
4090         gic_write_lpir(val, rdbase + GICR_INVALLR);
4091
4092         wait_for_syncr(rdbase);
4093         raw_spin_unlock(&gic_data_rdist_cpu(vpe->col_idx)->rd_lock);
4094 }
4095
4096 static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
4097 {
4098         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4099         struct its_cmd_info *info = vcpu_info;
4100
4101         switch (info->cmd_type) {
4102         case SCHEDULE_VPE:
4103                 its_vpe_4_1_schedule(vpe, info);
4104                 return 0;
4105
4106         case DESCHEDULE_VPE:
4107                 its_vpe_4_1_deschedule(vpe, info);
4108                 return 0;
4109
4110         case INVALL_VPE:
4111                 its_vpe_4_1_invall(vpe);
4112                 return 0;
4113
4114         default:
4115                 return -EINVAL;
4116         }
4117 }
4118
4119 static struct irq_chip its_vpe_4_1_irq_chip = {
4120         .name                   = "GICv4.1-vpe",
4121         .irq_mask               = its_vpe_4_1_mask_irq,
4122         .irq_unmask             = its_vpe_4_1_unmask_irq,
4123         .irq_eoi                = irq_chip_eoi_parent,
4124         .irq_set_affinity       = its_vpe_set_affinity,
4125         .irq_set_vcpu_affinity  = its_vpe_4_1_set_vcpu_affinity,
4126 };
4127
4128 static void its_configure_sgi(struct irq_data *d, bool clear)
4129 {
4130         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4131         struct its_cmd_desc desc;
4132
4133         desc.its_vsgi_cmd.vpe = vpe;
4134         desc.its_vsgi_cmd.sgi = d->hwirq;
4135         desc.its_vsgi_cmd.priority = vpe->sgi_config[d->hwirq].priority;
4136         desc.its_vsgi_cmd.enable = vpe->sgi_config[d->hwirq].enabled;
4137         desc.its_vsgi_cmd.group = vpe->sgi_config[d->hwirq].group;
4138         desc.its_vsgi_cmd.clear = clear;
4139
4140         /*
4141          * GICv4.1 allows us to send VSGI commands to any ITS as long as the
4142          * destination VPE is mapped there. Since we map them eagerly at
4143          * activation time, we're pretty sure the first GICv4.1 ITS will do.
4144          */
4145         its_send_single_vcommand(find_4_1_its(), its_build_vsgi_cmd, &desc);
4146 }
4147
4148 static void its_sgi_mask_irq(struct irq_data *d)
4149 {
4150         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4151
4152         vpe->sgi_config[d->hwirq].enabled = false;
4153         its_configure_sgi(d, false);
4154 }
4155
4156 static void its_sgi_unmask_irq(struct irq_data *d)
4157 {
4158         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4159
4160         vpe->sgi_config[d->hwirq].enabled = true;
4161         its_configure_sgi(d, false);
4162 }
4163
4164 static int its_sgi_set_affinity(struct irq_data *d,
4165                                 const struct cpumask *mask_val,
4166                                 bool force)
4167 {
4168         /*
4169          * There is no notion of affinity for virtual SGIs, at least
4170          * not on the host (since they can only be targetting a vPE).
4171          * Tell the kernel we've done whatever it asked for.
4172          */
4173         irq_data_update_effective_affinity(d, mask_val);
4174         return IRQ_SET_MASK_OK;
4175 }
4176
4177 static int its_sgi_set_irqchip_state(struct irq_data *d,
4178                                      enum irqchip_irq_state which,
4179                                      bool state)
4180 {
4181         if (which != IRQCHIP_STATE_PENDING)
4182                 return -EINVAL;
4183
4184         if (state) {
4185                 struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4186                 struct its_node *its = find_4_1_its();
4187                 u64 val;
4188
4189                 val  = FIELD_PREP(GITS_SGIR_VPEID, vpe->vpe_id);
4190                 val |= FIELD_PREP(GITS_SGIR_VINTID, d->hwirq);
4191                 writeq_relaxed(val, its->sgir_base + GITS_SGIR - SZ_128K);
4192         } else {
4193                 its_configure_sgi(d, true);
4194         }
4195
4196         return 0;
4197 }
4198
4199 static int its_sgi_get_irqchip_state(struct irq_data *d,
4200                                      enum irqchip_irq_state which, bool *val)
4201 {
4202         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4203         void __iomem *base;
4204         unsigned long flags;
4205         u32 count = 1000000;    /* 1s! */
4206         u32 status;
4207         int cpu;
4208
4209         if (which != IRQCHIP_STATE_PENDING)
4210                 return -EINVAL;
4211
4212         /*
4213          * Locking galore! We can race against two different events:
4214          *
4215          * - Concurent vPE affinity change: we must make sure it cannot
4216          *   happen, or we'll talk to the wrong redistributor. This is
4217          *   identical to what happens with vLPIs.
4218          *
4219          * - Concurrent VSGIPENDR access: As it involves accessing two
4220          *   MMIO registers, this must be made atomic one way or another.
4221          */
4222         cpu = vpe_to_cpuid_lock(vpe, &flags);
4223         raw_spin_lock(&gic_data_rdist_cpu(cpu)->rd_lock);
4224         base = gic_data_rdist_cpu(cpu)->rd_base + SZ_128K;
4225         writel_relaxed(vpe->vpe_id, base + GICR_VSGIR);
4226         do {
4227                 status = readl_relaxed(base + GICR_VSGIPENDR);
4228                 if (!(status & GICR_VSGIPENDR_BUSY))
4229                         goto out;
4230
4231                 count--;
4232                 if (!count) {
4233                         pr_err_ratelimited("Unable to get SGI status\n");
4234                         goto out;
4235                 }
4236                 cpu_relax();
4237                 udelay(1);
4238         } while (count);
4239
4240 out:
4241         raw_spin_unlock(&gic_data_rdist_cpu(cpu)->rd_lock);
4242         vpe_to_cpuid_unlock(vpe, flags);
4243
4244         if (!count)
4245                 return -ENXIO;
4246
4247         *val = !!(status & (1 << d->hwirq));
4248
4249         return 0;
4250 }
4251
4252 static int its_sgi_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
4253 {
4254         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4255         struct its_cmd_info *info = vcpu_info;
4256
4257         switch (info->cmd_type) {
4258         case PROP_UPDATE_VSGI:
4259                 vpe->sgi_config[d->hwirq].priority = info->priority;
4260                 vpe->sgi_config[d->hwirq].group = info->group;
4261                 its_configure_sgi(d, false);
4262                 return 0;
4263
4264         default:
4265                 return -EINVAL;
4266         }
4267 }
4268
4269 static struct irq_chip its_sgi_irq_chip = {
4270         .name                   = "GICv4.1-sgi",
4271         .irq_mask               = its_sgi_mask_irq,
4272         .irq_unmask             = its_sgi_unmask_irq,
4273         .irq_set_affinity       = its_sgi_set_affinity,
4274         .irq_set_irqchip_state  = its_sgi_set_irqchip_state,
4275         .irq_get_irqchip_state  = its_sgi_get_irqchip_state,
4276         .irq_set_vcpu_affinity  = its_sgi_set_vcpu_affinity,
4277 };
4278
4279 static int its_sgi_irq_domain_alloc(struct irq_domain *domain,
4280                                     unsigned int virq, unsigned int nr_irqs,
4281                                     void *args)
4282 {
4283         struct its_vpe *vpe = args;
4284         int i;
4285
4286         /* Yes, we do want 16 SGIs */
4287         WARN_ON(nr_irqs != 16);
4288
4289         for (i = 0; i < 16; i++) {
4290                 vpe->sgi_config[i].priority = 0;
4291                 vpe->sgi_config[i].enabled = false;
4292                 vpe->sgi_config[i].group = false;
4293
4294                 irq_domain_set_hwirq_and_chip(domain, virq + i, i,
4295                                               &its_sgi_irq_chip, vpe);
4296                 irq_set_status_flags(virq + i, IRQ_DISABLE_UNLAZY);
4297         }
4298
4299         return 0;
4300 }
4301
4302 static void its_sgi_irq_domain_free(struct irq_domain *domain,
4303                                     unsigned int virq,
4304                                     unsigned int nr_irqs)
4305 {
4306         /* Nothing to do */
4307 }
4308
4309 static int its_sgi_irq_domain_activate(struct irq_domain *domain,
4310                                        struct irq_data *d, bool reserve)
4311 {
4312         /* Write out the initial SGI configuration */
4313         its_configure_sgi(d, false);
4314         return 0;
4315 }
4316
4317 static void its_sgi_irq_domain_deactivate(struct irq_domain *domain,
4318                                           struct irq_data *d)
4319 {
4320         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4321
4322         /*
4323          * The VSGI command is awkward:
4324          *
4325          * - To change the configuration, CLEAR must be set to false,
4326          *   leaving the pending bit unchanged.
4327          * - To clear the pending bit, CLEAR must be set to true, leaving
4328          *   the configuration unchanged.
4329          *
4330          * You just can't do both at once, hence the two commands below.
4331          */
4332         vpe->sgi_config[d->hwirq].enabled = false;
4333         its_configure_sgi(d, false);
4334         its_configure_sgi(d, true);
4335 }
4336
4337 static const struct irq_domain_ops its_sgi_domain_ops = {
4338         .alloc          = its_sgi_irq_domain_alloc,
4339         .free           = its_sgi_irq_domain_free,
4340         .activate       = its_sgi_irq_domain_activate,
4341         .deactivate     = its_sgi_irq_domain_deactivate,
4342 };
4343
4344 static int its_vpe_id_alloc(void)
4345 {
4346         return ida_simple_get(&its_vpeid_ida, 0, ITS_MAX_VPEID, GFP_KERNEL);
4347 }
4348
4349 static void its_vpe_id_free(u16 id)
4350 {
4351         ida_simple_remove(&its_vpeid_ida, id);
4352 }
4353
4354 static int its_vpe_init(struct its_vpe *vpe)
4355 {
4356         struct page *vpt_page;
4357         int vpe_id;
4358
4359         /* Allocate vpe_id */
4360         vpe_id = its_vpe_id_alloc();
4361         if (vpe_id < 0)
4362                 return vpe_id;
4363
4364         /* Allocate VPT */
4365         vpt_page = its_allocate_pending_table(GFP_KERNEL);
4366         if (!vpt_page) {
4367                 its_vpe_id_free(vpe_id);
4368                 return -ENOMEM;
4369         }
4370
4371         if (!its_alloc_vpe_table(vpe_id)) {
4372                 its_vpe_id_free(vpe_id);
4373                 its_free_pending_table(vpt_page);
4374                 return -ENOMEM;
4375         }
4376
4377         raw_spin_lock_init(&vpe->vpe_lock);
4378         vpe->vpe_id = vpe_id;
4379         vpe->vpt_page = vpt_page;
4380         if (gic_rdists->has_rvpeid)
4381                 atomic_set(&vpe->vmapp_count, 0);
4382         else
4383                 vpe->vpe_proxy_event = -1;
4384
4385         return 0;
4386 }
4387
4388 static void its_vpe_teardown(struct its_vpe *vpe)
4389 {
4390         its_vpe_db_proxy_unmap(vpe);
4391         its_vpe_id_free(vpe->vpe_id);
4392         its_free_pending_table(vpe->vpt_page);
4393 }
4394
4395 static void its_vpe_irq_domain_free(struct irq_domain *domain,
4396                                     unsigned int virq,
4397                                     unsigned int nr_irqs)
4398 {
4399         struct its_vm *vm = domain->host_data;
4400         int i;
4401
4402         irq_domain_free_irqs_parent(domain, virq, nr_irqs);
4403
4404         for (i = 0; i < nr_irqs; i++) {
4405                 struct irq_data *data = irq_domain_get_irq_data(domain,
4406                                                                 virq + i);
4407                 struct its_vpe *vpe = irq_data_get_irq_chip_data(data);
4408
4409                 BUG_ON(vm != vpe->its_vm);
4410
4411                 clear_bit(data->hwirq, vm->db_bitmap);
4412                 its_vpe_teardown(vpe);
4413                 irq_domain_reset_irq_data(data);
4414         }
4415
4416         if (bitmap_empty(vm->db_bitmap, vm->nr_db_lpis)) {
4417                 its_lpi_free(vm->db_bitmap, vm->db_lpi_base, vm->nr_db_lpis);
4418                 its_free_prop_table(vm->vprop_page);
4419         }
4420 }
4421
4422 static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
4423                                     unsigned int nr_irqs, void *args)
4424 {
4425         struct irq_chip *irqchip = &its_vpe_irq_chip;
4426         struct its_vm *vm = args;
4427         unsigned long *bitmap;
4428         struct page *vprop_page;
4429         int base, nr_ids, i, err = 0;
4430
4431         BUG_ON(!vm);
4432
4433         bitmap = its_lpi_alloc(roundup_pow_of_two(nr_irqs), &base, &nr_ids);
4434         if (!bitmap)
4435                 return -ENOMEM;
4436
4437         if (nr_ids < nr_irqs) {
4438                 its_lpi_free(bitmap, base, nr_ids);
4439                 return -ENOMEM;
4440         }
4441
4442         vprop_page = its_allocate_prop_table(GFP_KERNEL);
4443         if (!vprop_page) {
4444                 its_lpi_free(bitmap, base, nr_ids);
4445                 return -ENOMEM;
4446         }
4447
4448         vm->db_bitmap = bitmap;
4449         vm->db_lpi_base = base;
4450         vm->nr_db_lpis = nr_ids;
4451         vm->vprop_page = vprop_page;
4452
4453         if (gic_rdists->has_rvpeid)
4454                 irqchip = &its_vpe_4_1_irq_chip;
4455
4456         for (i = 0; i < nr_irqs; i++) {
4457                 vm->vpes[i]->vpe_db_lpi = base + i;
4458                 err = its_vpe_init(vm->vpes[i]);
4459                 if (err)
4460                         break;
4461                 err = its_irq_gic_domain_alloc(domain, virq + i,
4462                                                vm->vpes[i]->vpe_db_lpi);
4463                 if (err)
4464                         break;
4465                 irq_domain_set_hwirq_and_chip(domain, virq + i, i,
4466                                               irqchip, vm->vpes[i]);
4467                 set_bit(i, bitmap);
4468         }
4469
4470         if (err) {
4471                 if (i > 0)
4472                         its_vpe_irq_domain_free(domain, virq, i - 1);
4473
4474                 its_lpi_free(bitmap, base, nr_ids);
4475                 its_free_prop_table(vprop_page);
4476         }
4477
4478         return err;
4479 }
4480
4481 static int its_vpe_irq_domain_activate(struct irq_domain *domain,
4482                                        struct irq_data *d, bool reserve)
4483 {
4484         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4485         struct its_node *its;
4486
4487         /*
4488          * If we use the list map, we issue VMAPP on demand... Unless
4489          * we're on a GICv4.1 and we eagerly map the VPE on all ITSs
4490          * so that VSGIs can work.
4491          */
4492         if (!gic_requires_eager_mapping())
4493                 return 0;
4494
4495         /* Map the VPE to the first possible CPU */
4496         vpe->col_idx = cpumask_first(cpu_online_mask);
4497
4498         list_for_each_entry(its, &its_nodes, entry) {
4499                 if (!is_v4(its))
4500                         continue;
4501
4502                 its_send_vmapp(its, vpe, true);
4503                 its_send_vinvall(its, vpe);
4504         }
4505
4506         irq_data_update_effective_affinity(d, cpumask_of(vpe->col_idx));
4507
4508         return 0;
4509 }
4510
4511 static void its_vpe_irq_domain_deactivate(struct irq_domain *domain,
4512                                           struct irq_data *d)
4513 {
4514         struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
4515         struct its_node *its;
4516
4517         /*
4518          * If we use the list map on GICv4.0, we unmap the VPE once no
4519          * VLPIs are associated with the VM.
4520          */
4521         if (!gic_requires_eager_mapping())
4522                 return;
4523
4524         list_for_each_entry(its, &its_nodes, entry) {
4525                 if (!is_v4(its))
4526                         continue;
4527
4528                 its_send_vmapp(its, vpe, false);
4529         }
4530 }
4531
4532 static const struct irq_domain_ops its_vpe_domain_ops = {
4533         .alloc                  = its_vpe_irq_domain_alloc,
4534         .free                   = its_vpe_irq_domain_free,
4535         .activate               = its_vpe_irq_domain_activate,
4536         .deactivate             = its_vpe_irq_domain_deactivate,
4537 };
4538
4539 static int its_force_quiescent(void __iomem *base)
4540 {
4541         u32 count = 1000000;    /* 1s */
4542         u32 val;
4543
4544         val = readl_relaxed(base + GITS_CTLR);
4545         /*
4546          * GIC architecture specification requires the ITS to be both
4547          * disabled and quiescent for writes to GITS_BASER<n> or
4548          * GITS_CBASER to not have UNPREDICTABLE results.
4549          */
4550         if ((val & GITS_CTLR_QUIESCENT) && !(val & GITS_CTLR_ENABLE))
4551                 return 0;
4552
4553         /* Disable the generation of all interrupts to this ITS */
4554         val &= ~(GITS_CTLR_ENABLE | GITS_CTLR_ImDe);
4555         writel_relaxed(val, base + GITS_CTLR);
4556
4557         /* Poll GITS_CTLR and wait until ITS becomes quiescent */
4558         while (1) {
4559                 val = readl_relaxed(base + GITS_CTLR);
4560                 if (val & GITS_CTLR_QUIESCENT)
4561                         return 0;
4562
4563                 count--;
4564                 if (!count)
4565                         return -EBUSY;
4566
4567                 cpu_relax();
4568                 udelay(1);
4569         }
4570 }
4571
4572 static bool __maybe_unused its_enable_quirk_cavium_22375(void *data)
4573 {
4574         struct its_node *its = data;
4575
4576         /* erratum 22375: only alloc 8MB table size (20 bits) */
4577         its->typer &= ~GITS_TYPER_DEVBITS;
4578         its->typer |= FIELD_PREP(GITS_TYPER_DEVBITS, 20 - 1);
4579         its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_22375;
4580
4581         return true;
4582 }
4583
4584 static bool __maybe_unused its_enable_quirk_cavium_23144(void *data)
4585 {
4586         struct its_node *its = data;
4587
4588         its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_23144;
4589
4590         return true;
4591 }
4592
4593 static bool __maybe_unused its_enable_quirk_qdf2400_e0065(void *data)
4594 {
4595         struct its_node *its = data;
4596
4597         /* On QDF2400, the size of the ITE is 16Bytes */
4598         its->typer &= ~GITS_TYPER_ITT_ENTRY_SIZE;
4599         its->typer |= FIELD_PREP(GITS_TYPER_ITT_ENTRY_SIZE, 16 - 1);
4600
4601         return true;
4602 }
4603
4604 static u64 its_irq_get_msi_base_pre_its(struct its_device *its_dev)
4605 {
4606         struct its_node *its = its_dev->its;
4607
4608         /*
4609          * The Socionext Synquacer SoC has a so-called 'pre-ITS',
4610          * which maps 32-bit writes targeted at a separate window of
4611          * size '4 << device_id_bits' onto writes to GITS_TRANSLATER
4612          * with device ID taken from bits [device_id_bits + 1:2] of
4613          * the window offset.
4614          */
4615         return its->pre_its_base + (its_dev->device_id << 2);
4616 }
4617
4618 static bool __maybe_unused its_enable_quirk_socionext_synquacer(void *data)
4619 {
4620         struct its_node *its = data;
4621         u32 pre_its_window[2];
4622         u32 ids;
4623
4624         if (!fwnode_property_read_u32_array(its->fwnode_handle,
4625                                            "socionext,synquacer-pre-its",
4626                                            pre_its_window,
4627                                            ARRAY_SIZE(pre_its_window))) {
4628
4629                 its->pre_its_base = pre_its_window[0];
4630                 its->get_msi_base = its_irq_get_msi_base_pre_its;
4631
4632                 ids = ilog2(pre_its_window[1]) - 2;
4633                 if (device_ids(its) > ids) {
4634                         its->typer &= ~GITS_TYPER_DEVBITS;
4635                         its->typer |= FIELD_PREP(GITS_TYPER_DEVBITS, ids - 1);
4636                 }
4637
4638                 /* the pre-ITS breaks isolation, so disable MSI remapping */
4639                 its->msi_domain_flags &= ~IRQ_DOMAIN_FLAG_MSI_REMAP;
4640                 return true;
4641         }
4642         return false;
4643 }
4644
4645 static bool __maybe_unused its_enable_quirk_hip07_161600802(void *data)
4646 {
4647         struct its_node *its = data;
4648
4649         /*
4650          * Hip07 insists on using the wrong address for the VLPI
4651          * page. Trick it into doing the right thing...
4652          */
4653         its->vlpi_redist_offset = SZ_128K;
4654         return true;
4655 }
4656
4657 static const struct gic_quirk its_quirks[] = {
4658 #ifdef CONFIG_CAVIUM_ERRATUM_22375
4659         {
4660                 .desc   = "ITS: Cavium errata 22375, 24313",
4661                 .iidr   = 0xa100034c,   /* ThunderX pass 1.x */
4662                 .mask   = 0xffff0fff,
4663                 .init   = its_enable_quirk_cavium_22375,
4664         },
4665 #endif
4666 #ifdef CONFIG_CAVIUM_ERRATUM_23144
4667         {
4668                 .desc   = "ITS: Cavium erratum 23144",
4669                 .iidr   = 0xa100034c,   /* ThunderX pass 1.x */
4670                 .mask   = 0xffff0fff,
4671                 .init   = its_enable_quirk_cavium_23144,
4672         },
4673 #endif
4674 #ifdef CONFIG_QCOM_QDF2400_ERRATUM_0065
4675         {
4676                 .desc   = "ITS: QDF2400 erratum 0065",
4677                 .iidr   = 0x00001070, /* QDF2400 ITS rev 1.x */
4678                 .mask   = 0xffffffff,
4679                 .init   = its_enable_quirk_qdf2400_e0065,
4680         },
4681 #endif
4682 #ifdef CONFIG_SOCIONEXT_SYNQUACER_PREITS
4683         {
4684                 /*
4685                  * The Socionext Synquacer SoC incorporates ARM's own GIC-500
4686                  * implementation, but with a 'pre-ITS' added that requires
4687                  * special handling in software.
4688                  */
4689                 .desc   = "ITS: Socionext Synquacer pre-ITS",
4690                 .iidr   = 0x0001143b,
4691                 .mask   = 0xffffffff,
4692                 .init   = its_enable_quirk_socionext_synquacer,
4693         },
4694 #endif
4695 #ifdef CONFIG_HISILICON_ERRATUM_161600802
4696         {
4697                 .desc   = "ITS: Hip07 erratum 161600802",
4698                 .iidr   = 0x00000004,
4699                 .mask   = 0xffffffff,
4700                 .init   = its_enable_quirk_hip07_161600802,
4701         },
4702 #endif
4703         {
4704         }
4705 };
4706
4707 static void its_enable_quirks(struct its_node *its)
4708 {
4709         u32 iidr = readl_relaxed(its->base + GITS_IIDR);
4710
4711         gic_enable_quirks(iidr, its_quirks, its);
4712 }
4713
4714 static int its_save_disable(void)
4715 {
4716         struct its_node *its;
4717         int err = 0;
4718
4719         raw_spin_lock(&its_lock);
4720         list_for_each_entry(its, &its_nodes, entry) {
4721                 void __iomem *base;
4722
4723                 if (!(its->flags & ITS_FLAGS_SAVE_SUSPEND_STATE))
4724                         continue;
4725
4726                 base = its->base;
4727                 its->ctlr_save = readl_relaxed(base + GITS_CTLR);
4728                 err = its_force_quiescent(base);
4729                 if (err) {
4730                         pr_err("ITS@%pa: failed to quiesce: %d\n",
4731                                &its->phys_base, err);
4732                         writel_relaxed(its->ctlr_save, base + GITS_CTLR);
4733                         goto err;
4734                 }
4735
4736                 its->cbaser_save = gits_read_cbaser(base + GITS_CBASER);
4737         }
4738
4739 err:
4740         if (err) {
4741                 list_for_each_entry_continue_reverse(its, &its_nodes, entry) {
4742                         void __iomem *base;
4743
4744                         if (!(its->flags & ITS_FLAGS_SAVE_SUSPEND_STATE))
4745                                 continue;
4746
4747                         base = its->base;
4748                         writel_relaxed(its->ctlr_save, base + GITS_CTLR);
4749                 }
4750         }
4751         raw_spin_unlock(&its_lock);
4752
4753         return err;
4754 }
4755
4756 static void its_restore_enable(void)
4757 {
4758         struct its_node *its;
4759         int ret;
4760
4761         raw_spin_lock(&its_lock);
4762         list_for_each_entry(its, &its_nodes, entry) {
4763                 void __iomem *base;
4764                 int i;
4765
4766                 if (!(its->flags & ITS_FLAGS_SAVE_SUSPEND_STATE))
4767                         continue;
4768
4769                 base = its->base;
4770
4771                 /*
4772                  * Make sure that the ITS is disabled. If it fails to quiesce,
4773                  * don't restore it since writing to CBASER or BASER<n>
4774                  * registers is undefined according to the GIC v3 ITS
4775                  * Specification.
4776                  */
4777                 ret = its_force_quiescent(base);
4778                 if (ret) {
4779                         pr_err("ITS@%pa: failed to quiesce on resume: %d\n",
4780                                &its->phys_base, ret);
4781                         continue;
4782                 }
4783
4784                 gits_write_cbaser(its->cbaser_save, base + GITS_CBASER);
4785
4786                 /*
4787                  * Writing CBASER resets CREADR to 0, so make CWRITER and
4788                  * cmd_write line up with it.
4789                  */
4790                 its->cmd_write = its->cmd_base;
4791                 gits_write_cwriter(0, base + GITS_CWRITER);
4792
4793                 /* Restore GITS_BASER from the value cache. */
4794                 for (i = 0; i < GITS_BASER_NR_REGS; i++) {
4795                         struct its_baser *baser = &its->tables[i];
4796
4797                         if (!(baser->val & GITS_BASER_VALID))
4798                                 continue;
4799
4800                         its_write_baser(its, baser, baser->val);
4801                 }
4802                 writel_relaxed(its->ctlr_save, base + GITS_CTLR);
4803
4804                 /*
4805                  * Reinit the collection if it's stored in the ITS. This is
4806                  * indicated by the col_id being less than the HCC field.
4807                  * CID < HCC as specified in the GIC v3 Documentation.
4808                  */
4809                 if (its->collections[smp_processor_id()].col_id <
4810                     GITS_TYPER_HCC(gic_read_typer(base + GITS_TYPER)))
4811                         its_cpu_init_collection(its);
4812         }
4813         raw_spin_unlock(&its_lock);
4814 }
4815
4816 static struct syscore_ops its_syscore_ops = {
4817         .suspend = its_save_disable,
4818         .resume = its_restore_enable,
4819 };
4820
4821 static int its_init_domain(struct fwnode_handle *handle, struct its_node *its)
4822 {
4823         struct irq_domain *inner_domain;
4824         struct msi_domain_info *info;
4825
4826         info = kzalloc(sizeof(*info), GFP_KERNEL);
4827         if (!info)
4828                 return -ENOMEM;
4829
4830         inner_domain = irq_domain_create_tree(handle, &its_domain_ops, its);
4831         if (!inner_domain) {
4832                 kfree(info);
4833                 return -ENOMEM;
4834         }
4835
4836         inner_domain->parent = its_parent;
4837         irq_domain_update_bus_token(inner_domain, DOMAIN_BUS_NEXUS);
4838         inner_domain->flags |= its->msi_domain_flags;
4839         info->ops = &its_msi_domain_ops;
4840         info->data = its;
4841         inner_domain->host_data = info;
4842
4843         return 0;
4844 }
4845
4846 static int its_init_vpe_domain(void)
4847 {
4848         struct its_node *its;
4849         u32 devid;
4850         int entries;
4851
4852         if (gic_rdists->has_direct_lpi) {
4853                 pr_info("ITS: Using DirectLPI for VPE invalidation\n");
4854                 return 0;
4855         }
4856
4857         /* Any ITS will do, even if not v4 */
4858         its = list_first_entry(&its_nodes, struct its_node, entry);
4859
4860         entries = roundup_pow_of_two(nr_cpu_ids);
4861         vpe_proxy.vpes = kcalloc(entries, sizeof(*vpe_proxy.vpes),
4862                                  GFP_KERNEL);
4863         if (!vpe_proxy.vpes) {
4864                 pr_err("ITS: Can't allocate GICv4 proxy device array\n");
4865                 return -ENOMEM;
4866         }
4867
4868         /* Use the last possible DevID */
4869         devid = GENMASK(device_ids(its) - 1, 0);
4870         vpe_proxy.dev = its_create_device(its, devid, entries, false);
4871         if (!vpe_proxy.dev) {
4872                 kfree(vpe_proxy.vpes);
4873                 pr_err("ITS: Can't allocate GICv4 proxy device\n");
4874                 return -ENOMEM;
4875         }
4876
4877         BUG_ON(entries > vpe_proxy.dev->nr_ites);
4878
4879         raw_spin_lock_init(&vpe_proxy.lock);
4880         vpe_proxy.next_victim = 0;
4881         pr_info("ITS: Allocated DevID %x as GICv4 proxy device (%d slots)\n",
4882                 devid, vpe_proxy.dev->nr_ites);
4883
4884         return 0;
4885 }
4886
4887 static int __init its_compute_its_list_map(struct resource *res,
4888                                            void __iomem *its_base)
4889 {
4890         int its_number;
4891         u32 ctlr;
4892
4893         /*
4894          * This is assumed to be done early enough that we're
4895          * guaranteed to be single-threaded, hence no
4896          * locking. Should this change, we should address
4897          * this.
4898          */
4899         its_number = find_first_zero_bit(&its_list_map, GICv4_ITS_LIST_MAX);
4900         if (its_number >= GICv4_ITS_LIST_MAX) {
4901                 pr_err("ITS@%pa: No ITSList entry available!\n",
4902                        &res->start);
4903                 return -EINVAL;
4904         }
4905
4906         ctlr = readl_relaxed(its_base + GITS_CTLR);
4907         ctlr &= ~GITS_CTLR_ITS_NUMBER;
4908         ctlr |= its_number << GITS_CTLR_ITS_NUMBER_SHIFT;
4909         writel_relaxed(ctlr, its_base + GITS_CTLR);
4910         ctlr = readl_relaxed(its_base + GITS_CTLR);
4911         if ((ctlr & GITS_CTLR_ITS_NUMBER) != (its_number << GITS_CTLR_ITS_NUMBER_SHIFT)) {
4912                 its_number = ctlr & GITS_CTLR_ITS_NUMBER;
4913                 its_number >>= GITS_CTLR_ITS_NUMBER_SHIFT;
4914         }
4915
4916         if (test_and_set_bit(its_number, &its_list_map)) {
4917                 pr_err("ITS@%pa: Duplicate ITSList entry %d\n",
4918                        &res->start, its_number);
4919                 return -EINVAL;
4920         }
4921
4922         return its_number;
4923 }
4924
4925 static int __init its_probe_one(struct resource *res,
4926                                 struct fwnode_handle *handle, int numa_node)
4927 {
4928         struct its_node *its;
4929         void __iomem *its_base;
4930         u32 val, ctlr;
4931         u64 baser, tmp, typer;
4932         struct page *page;
4933         int err;
4934
4935         its_base = ioremap(res->start, SZ_64K);
4936         if (!its_base) {
4937                 pr_warn("ITS@%pa: Unable to map ITS registers\n", &res->start);
4938                 return -ENOMEM;
4939         }
4940
4941         val = readl_relaxed(its_base + GITS_PIDR2) & GIC_PIDR2_ARCH_MASK;
4942         if (val != 0x30 && val != 0x40) {
4943                 pr_warn("ITS@%pa: No ITS detected, giving up\n", &res->start);
4944                 err = -ENODEV;
4945                 goto out_unmap;
4946         }
4947
4948         err = its_force_quiescent(its_base);
4949         if (err) {
4950                 pr_warn("ITS@%pa: Failed to quiesce, giving up\n", &res->start);
4951                 goto out_unmap;
4952         }
4953
4954         pr_info("ITS %pR\n", res);
4955
4956         its = kzalloc(sizeof(*its), GFP_KERNEL);
4957         if (!its) {
4958                 err = -ENOMEM;
4959                 goto out_unmap;
4960         }
4961
4962         raw_spin_lock_init(&its->lock);
4963         mutex_init(&its->dev_alloc_lock);
4964         INIT_LIST_HEAD(&its->entry);
4965         INIT_LIST_HEAD(&its->its_device_list);
4966         typer = gic_read_typer(its_base + GITS_TYPER);
4967         its->typer = typer;
4968         its->base = its_base;
4969         its->phys_base = res->start;
4970         if (is_v4(its)) {
4971                 if (!(typer & GITS_TYPER_VMOVP)) {
4972                         err = its_compute_its_list_map(res, its_base);
4973                         if (err < 0)
4974                                 goto out_free_its;
4975
4976                         its->list_nr = err;
4977
4978                         pr_info("ITS@%pa: Using ITS number %d\n",
4979                                 &res->start, err);
4980                 } else {
4981                         pr_info("ITS@%pa: Single VMOVP capable\n", &res->start);
4982                 }
4983
4984                 if (is_v4_1(its)) {
4985                         u32 svpet = FIELD_GET(GITS_TYPER_SVPET, typer);
4986
4987                         its->sgir_base = ioremap(res->start + SZ_128K, SZ_64K);
4988                         if (!its->sgir_base) {
4989                                 err = -ENOMEM;
4990                                 goto out_free_its;
4991                         }
4992
4993                         its->mpidr = readl_relaxed(its_base + GITS_MPIDR);
4994
4995                         pr_info("ITS@%pa: Using GICv4.1 mode %08x %08x\n",
4996                                 &res->start, its->mpidr, svpet);
4997                 }
4998         }
4999
5000         its->numa_node = numa_node;
5001
5002         page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
5003                                 get_order(ITS_CMD_QUEUE_SZ));
5004         if (!page) {
5005                 err = -ENOMEM;
5006                 goto out_unmap_sgir;
5007         }
5008         its->cmd_base = (void *)page_address(page);
5009         its->cmd_write = its->cmd_base;
5010         its->fwnode_handle = handle;
5011         its->get_msi_base = its_irq_get_msi_base;
5012         its->msi_domain_flags = IRQ_DOMAIN_FLAG_MSI_REMAP;
5013
5014         its_enable_quirks(its);
5015
5016         err = its_alloc_tables(its);
5017         if (err)
5018                 goto out_free_cmd;
5019
5020         err = its_alloc_collections(its);
5021         if (err)
5022                 goto out_free_tables;
5023
5024         baser = (virt_to_phys(its->cmd_base)    |
5025                  GITS_CBASER_RaWaWb             |
5026                  GITS_CBASER_InnerShareable     |
5027                  (ITS_CMD_QUEUE_SZ / SZ_4K - 1) |
5028                  GITS_CBASER_VALID);
5029
5030         gits_write_cbaser(baser, its->base + GITS_CBASER);
5031         tmp = gits_read_cbaser(its->base + GITS_CBASER);
5032
5033         if ((tmp ^ baser) & GITS_CBASER_SHAREABILITY_MASK) {
5034                 if (!(tmp & GITS_CBASER_SHAREABILITY_MASK)) {
5035                         /*
5036                          * The HW reports non-shareable, we must
5037                          * remove the cacheability attributes as
5038                          * well.
5039                          */
5040                         baser &= ~(GITS_CBASER_SHAREABILITY_MASK |
5041                                    GITS_CBASER_CACHEABILITY_MASK);
5042                         baser |= GITS_CBASER_nC;
5043                         gits_write_cbaser(baser, its->base + GITS_CBASER);
5044                 }
5045                 pr_info("ITS: using cache flushing for cmd queue\n");
5046                 its->flags |= ITS_FLAGS_CMDQ_NEEDS_FLUSHING;
5047         }
5048
5049         gits_write_cwriter(0, its->base + GITS_CWRITER);
5050         ctlr = readl_relaxed(its->base + GITS_CTLR);
5051         ctlr |= GITS_CTLR_ENABLE;
5052         if (is_v4(its))
5053                 ctlr |= GITS_CTLR_ImDe;
5054         writel_relaxed(ctlr, its->base + GITS_CTLR);
5055
5056         if (GITS_TYPER_HCC(typer))
5057                 its->flags |= ITS_FLAGS_SAVE_SUSPEND_STATE;
5058
5059         err = its_init_domain(handle, its);
5060         if (err)
5061                 goto out_free_tables;
5062
5063         raw_spin_lock(&its_lock);
5064         list_add(&its->entry, &its_nodes);
5065         raw_spin_unlock(&its_lock);
5066
5067         return 0;
5068
5069 out_free_tables:
5070         its_free_tables(its);
5071 out_free_cmd:
5072         free_pages((unsigned long)its->cmd_base, get_order(ITS_CMD_QUEUE_SZ));
5073 out_unmap_sgir:
5074         if (its->sgir_base)
5075                 iounmap(its->sgir_base);
5076 out_free_its:
5077         kfree(its);
5078 out_unmap:
5079         iounmap(its_base);
5080         pr_err("ITS@%pa: failed probing (%d)\n", &res->start, err);
5081         return err;
5082 }
5083
5084 static bool gic_rdists_supports_plpis(void)
5085 {
5086         return !!(gic_read_typer(gic_data_rdist_rd_base() + GICR_TYPER) & GICR_TYPER_PLPIS);
5087 }
5088
5089 static int redist_disable_lpis(void)
5090 {
5091         void __iomem *rbase = gic_data_rdist_rd_base();
5092         u64 timeout = USEC_PER_SEC;
5093         u64 val;
5094
5095         if (!gic_rdists_supports_plpis()) {
5096                 pr_info("CPU%d: LPIs not supported\n", smp_processor_id());
5097                 return -ENXIO;
5098         }
5099
5100         val = readl_relaxed(rbase + GICR_CTLR);
5101         if (!(val & GICR_CTLR_ENABLE_LPIS))
5102                 return 0;
5103
5104         /*
5105          * If coming via a CPU hotplug event, we don't need to disable
5106          * LPIs before trying to re-enable them. They are already
5107          * configured and all is well in the world.
5108          *
5109          * If running with preallocated tables, there is nothing to do.
5110          */
5111         if (gic_data_rdist()->lpi_enabled ||
5112             (gic_rdists->flags & RDIST_FLAGS_RD_TABLES_PREALLOCATED))
5113                 return 0;
5114
5115         /*
5116          * From that point on, we only try to do some damage control.
5117          */
5118         pr_warn("GICv3: CPU%d: Booted with LPIs enabled, memory probably corrupted\n",
5119                 smp_processor_id());
5120         add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
5121
5122         /* Disable LPIs */
5123         val &= ~GICR_CTLR_ENABLE_LPIS;
5124         writel_relaxed(val, rbase + GICR_CTLR);
5125
5126         /* Make sure any change to GICR_CTLR is observable by the GIC */
5127         dsb(sy);
5128
5129         /*
5130          * Software must observe RWP==0 after clearing GICR_CTLR.EnableLPIs
5131          * from 1 to 0 before programming GICR_PEND{PROP}BASER registers.
5132          * Error out if we time out waiting for RWP to clear.
5133          */
5134         while (readl_relaxed(rbase + GICR_CTLR) & GICR_CTLR_RWP) {
5135                 if (!timeout) {
5136                         pr_err("CPU%d: Timeout while disabling LPIs\n",
5137                                smp_processor_id());
5138                         return -ETIMEDOUT;
5139                 }
5140                 udelay(1);
5141                 timeout--;
5142         }
5143
5144         /*
5145          * After it has been written to 1, it is IMPLEMENTATION
5146          * DEFINED whether GICR_CTLR.EnableLPI becomes RES1 or can be
5147          * cleared to 0. Error out if clearing the bit failed.
5148          */
5149         if (readl_relaxed(rbase + GICR_CTLR) & GICR_CTLR_ENABLE_LPIS) {
5150                 pr_err("CPU%d: Failed to disable LPIs\n", smp_processor_id());
5151                 return -EBUSY;
5152         }
5153
5154         return 0;
5155 }
5156
5157 int its_cpu_init(void)
5158 {
5159         if (!list_empty(&its_nodes)) {
5160                 int ret;
5161
5162                 ret = redist_disable_lpis();
5163                 if (ret)
5164                         return ret;
5165
5166                 its_cpu_init_lpis();
5167                 its_cpu_init_collections();
5168         }
5169
5170         return 0;
5171 }
5172
5173 static const struct of_device_id its_device_id[] = {
5174         {       .compatible     = "arm,gic-v3-its",     },
5175         {},
5176 };
5177
5178 static int __init its_of_probe(struct device_node *node)
5179 {
5180         struct device_node *np;
5181         struct resource res;
5182
5183         for (np = of_find_matching_node(node, its_device_id); np;
5184              np = of_find_matching_node(np, its_device_id)) {
5185                 if (!of_device_is_available(np))
5186                         continue;
5187                 if (!of_property_read_bool(np, "msi-controller")) {
5188                         pr_warn("%pOF: no msi-controller property, ITS ignored\n",
5189                                 np);
5190                         continue;
5191                 }
5192
5193                 if (of_address_to_resource(np, 0, &res)) {
5194                         pr_warn("%pOF: no regs?\n", np);
5195                         continue;
5196                 }
5197
5198                 its_probe_one(&res, &np->fwnode, of_node_to_nid(np));
5199         }
5200         return 0;
5201 }
5202
5203 #ifdef CONFIG_ACPI
5204
5205 #define ACPI_GICV3_ITS_MEM_SIZE (SZ_128K)
5206
5207 #ifdef CONFIG_ACPI_NUMA
5208 struct its_srat_map {
5209         /* numa node id */
5210         u32     numa_node;
5211         /* GIC ITS ID */
5212         u32     its_id;
5213 };
5214
5215 static struct its_srat_map *its_srat_maps __initdata;
5216 static int its_in_srat __initdata;
5217
5218 static int __init acpi_get_its_numa_node(u32 its_id)
5219 {
5220         int i;
5221
5222         for (i = 0; i < its_in_srat; i++) {
5223                 if (its_id == its_srat_maps[i].its_id)
5224                         return its_srat_maps[i].numa_node;
5225         }
5226         return NUMA_NO_NODE;
5227 }
5228
5229 static int __init gic_acpi_match_srat_its(union acpi_subtable_headers *header,
5230                                           const unsigned long end)
5231 {
5232         return 0;
5233 }
5234
5235 static int __init gic_acpi_parse_srat_its(union acpi_subtable_headers *header,
5236                          const unsigned long end)
5237 {
5238         int node;
5239         struct acpi_srat_gic_its_affinity *its_affinity;
5240
5241         its_affinity = (struct acpi_srat_gic_its_affinity *)header;
5242         if (!its_affinity)
5243                 return -EINVAL;
5244
5245         if (its_affinity->header.length < sizeof(*its_affinity)) {
5246                 pr_err("SRAT: Invalid header length %d in ITS affinity\n",
5247                         its_affinity->header.length);
5248                 return -EINVAL;
5249         }
5250
5251         node = acpi_map_pxm_to_node(its_affinity->proximity_domain);
5252
5253         if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
5254                 pr_err("SRAT: Invalid NUMA node %d in ITS affinity\n", node);
5255                 return 0;
5256         }
5257
5258         its_srat_maps[its_in_srat].numa_node = node;
5259         its_srat_maps[its_in_srat].its_id = its_affinity->its_id;
5260         its_in_srat++;
5261         pr_info("SRAT: PXM %d -> ITS %d -> Node %d\n",
5262                 its_affinity->proximity_domain, its_affinity->its_id, node);
5263
5264         return 0;
5265 }
5266
5267 static void __init acpi_table_parse_srat_its(void)
5268 {
5269         int count;
5270
5271         count = acpi_table_parse_entries(ACPI_SIG_SRAT,
5272                         sizeof(struct acpi_table_srat),
5273                         ACPI_SRAT_TYPE_GIC_ITS_AFFINITY,
5274                         gic_acpi_match_srat_its, 0);
5275         if (count <= 0)
5276                 return;
5277
5278         its_srat_maps = kmalloc_array(count, sizeof(struct its_srat_map),
5279                                       GFP_KERNEL);
5280         if (!its_srat_maps) {
5281                 pr_warn("SRAT: Failed to allocate memory for its_srat_maps!\n");
5282                 return;
5283         }
5284
5285         acpi_table_parse_entries(ACPI_SIG_SRAT,
5286                         sizeof(struct acpi_table_srat),
5287                         ACPI_SRAT_TYPE_GIC_ITS_AFFINITY,
5288                         gic_acpi_parse_srat_its, 0);
5289 }
5290
5291 /* free the its_srat_maps after ITS probing */
5292 static void __init acpi_its_srat_maps_free(void)
5293 {
5294         kfree(its_srat_maps);
5295 }
5296 #else
5297 static void __init acpi_table_parse_srat_its(void)      { }
5298 static int __init acpi_get_its_numa_node(u32 its_id) { return NUMA_NO_NODE; }
5299 static void __init acpi_its_srat_maps_free(void) { }
5300 #endif
5301
5302 static int __init gic_acpi_parse_madt_its(union acpi_subtable_headers *header,
5303                                           const unsigned long end)
5304 {
5305         struct acpi_madt_generic_translator *its_entry;
5306         struct fwnode_handle *dom_handle;
5307         struct resource res;
5308         int err;
5309
5310         its_entry = (struct acpi_madt_generic_translator *)header;
5311         memset(&res, 0, sizeof(res));
5312         res.start = its_entry->base_address;
5313         res.end = its_entry->base_address + ACPI_GICV3_ITS_MEM_SIZE - 1;
5314         res.flags = IORESOURCE_MEM;
5315
5316         dom_handle = irq_domain_alloc_fwnode(&res.start);
5317         if (!dom_handle) {
5318                 pr_err("ITS@%pa: Unable to allocate GICv3 ITS domain token\n",
5319                        &res.start);
5320                 return -ENOMEM;
5321         }
5322
5323         err = iort_register_domain_token(its_entry->translation_id, res.start,
5324                                          dom_handle);
5325         if (err) {
5326                 pr_err("ITS@%pa: Unable to register GICv3 ITS domain token (ITS ID %d) to IORT\n",
5327                        &res.start, its_entry->translation_id);
5328                 goto dom_err;
5329         }
5330
5331         err = its_probe_one(&res, dom_handle,
5332                         acpi_get_its_numa_node(its_entry->translation_id));
5333         if (!err)
5334                 return 0;
5335
5336         iort_deregister_domain_token(its_entry->translation_id);
5337 dom_err:
5338         irq_domain_free_fwnode(dom_handle);
5339         return err;
5340 }
5341
5342 static void __init its_acpi_probe(void)
5343 {
5344         acpi_table_parse_srat_its();
5345         acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
5346                               gic_acpi_parse_madt_its, 0);
5347         acpi_its_srat_maps_free();
5348 }
5349 #else
5350 static void __init its_acpi_probe(void) { }
5351 #endif
5352
5353 int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
5354                     struct irq_domain *parent_domain)
5355 {
5356         struct device_node *of_node;
5357         struct its_node *its;
5358         bool has_v4 = false;
5359         bool has_v4_1 = false;
5360         int err;
5361
5362         gic_rdists = rdists;
5363
5364         its_parent = parent_domain;
5365         of_node = to_of_node(handle);
5366         if (of_node)
5367                 its_of_probe(of_node);
5368         else
5369                 its_acpi_probe();
5370
5371         if (list_empty(&its_nodes)) {
5372                 pr_warn("ITS: No ITS available, not enabling LPIs\n");
5373                 return -ENXIO;
5374         }
5375
5376         err = allocate_lpi_tables();
5377         if (err)
5378                 return err;
5379
5380         list_for_each_entry(its, &its_nodes, entry) {
5381                 has_v4 |= is_v4(its);
5382                 has_v4_1 |= is_v4_1(its);
5383         }
5384
5385         /* Don't bother with inconsistent systems */
5386         if (WARN_ON(!has_v4_1 && rdists->has_rvpeid))
5387                 rdists->has_rvpeid = false;
5388
5389         if (has_v4 & rdists->has_vlpis) {
5390                 const struct irq_domain_ops *sgi_ops;
5391
5392                 if (has_v4_1)
5393                         sgi_ops = &its_sgi_domain_ops;
5394                 else
5395                         sgi_ops = NULL;
5396
5397                 if (its_init_vpe_domain() ||
5398                     its_init_v4(parent_domain, &its_vpe_domain_ops, sgi_ops)) {
5399                         rdists->has_vlpis = false;
5400                         pr_err("ITS: Disabling GICv4 support\n");
5401                 }
5402         }
5403
5404         register_syscore_ops(&its_syscore_ops);
5405
5406         return 0;
5407 }