drivers/irqchip/irq-gic-v3.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 #define pr_fmt(fmt)     "GICv3: " fmt
   8
   9 #include <linux/acpi.h>
  10 #include <linux/cpu.h>
  11 #include <linux/cpu_pm.h>
  12 #include <linux/delay.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/irqdomain.h>
  15 #include <linux/of.h>
  16 #include <linux/of_address.h>
  17 #include <linux/of_irq.h>
  18 #include <linux/percpu.h>
  19 #include <linux/refcount.h>
  20 #include <linux/slab.h>
  21
  22 #include <linux/irqchip.h>
  23 #include <linux/irqchip/arm-gic-common.h>
  24 #include <linux/irqchip/arm-gic-v3.h>
  25 #include <linux/irqchip/irq-partition-percpu.h>
  26
  27 #include <asm/cputype.h>
  28 #include <asm/exception.h>
  29 #include <asm/smp_plat.h>
  30 #include <asm/virt.h>
  31
  32 #include "irq-gic-common.h"
  33
  34 #define GICD_INT_NMI_PRI        (GICD_INT_DEF_PRI & ~0x80)
  35
  36 #define FLAGS_WORKAROUND_GICR_WAKER_MSM8996     (1ULL << 0)
  37 #define FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539   (1ULL << 1)
  38
  39 #define GIC_IRQ_TYPE_PARTITION  (GIC_IRQ_TYPE_LPI + 1)
  40
  41 struct redist_region {
  42         void __iomem            *redist_base;
  43         phys_addr_t             phys_base;
  44         bool                    single_redist;
  45 };
  46
  47 struct gic_chip_data {
  48         struct fwnode_handle    *fwnode;
  49         void __iomem            *dist_base;
  50         struct redist_region    *redist_regions;
  51         struct rdists           rdists;
  52         struct irq_domain       *domain;
  53         u64                     redist_stride;
  54         u32                     nr_redist_regions;
  55         u64                     flags;
  56         bool                    has_rss;
  57         unsigned int            ppi_nr;
  58         struct partition_desc   **ppi_descs;
  59 };
  60
  61 static struct gic_chip_data gic_data __read_mostly;
  62 static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
  63
  64 #define GIC_ID_NR       (1U << GICD_TYPER_ID_BITS(gic_data.rdists.gicd_typer))
  65 #define GIC_LINE_NR     min(GICD_TYPER_SPIS(gic_data.rdists.gicd_typer), 1020U)
  66 #define GIC_ESPI_NR     GICD_TYPER_ESPIS(gic_data.rdists.gicd_typer)
  67
  68 /*
  69  * The behaviours of RPR and PMR registers differ depending on the value of
  70  * SCR_EL3.FIQ, and the behaviour of non-secure priority registers of the
  71  * distributor and redistributors depends on whether security is enabled in the
  72  * GIC.
  73  *
  74  * When security is enabled, non-secure priority values from the (re)distributor
  75  * are presented to the GIC CPUIF as follow:
  76  *     (GIC_(R)DIST_PRI[irq] >> 1) | 0x80;
  77  *
  78  * If SCR_EL3.FIQ == 1, the values writen to/read from PMR and RPR at non-secure
  79  * EL1 are subject to a similar operation thus matching the priorities presented
  80  * from the (re)distributor when security is enabled. When SCR_EL3.FIQ == 0,
  81  * these values are unchanched by the GIC.
  82  *
  83  * see GICv3/GICv4 Architecture Specification (IHI0069D):
  84  * - section 4.8.1 Non-secure accesses to register fields for Secure interrupt
  85  *   priorities.
  86  * - Figure 4-7 Secure read of the priority field for a Non-secure Group 1
  87  *   interrupt.
  88  */
  89 static DEFINE_STATIC_KEY_FALSE(supports_pseudo_nmis);
  90
  91 /*
  92  * Global static key controlling whether an update to PMR allowing more
  93  * interrupts requires to be propagated to the redistributor (DSB SY).
  94  * And this needs to be exported for modules to be able to enable
  95  * interrupts...
  96  */
  97 DEFINE_STATIC_KEY_FALSE(gic_pmr_sync);
  98 EXPORT_SYMBOL(gic_pmr_sync);
  99
 100 DEFINE_STATIC_KEY_FALSE(gic_nonsecure_priorities);
 101 EXPORT_SYMBOL(gic_nonsecure_priorities);
 102
 103 /* ppi_nmi_refs[n] == number of cpus having ppi[n + 16] set as NMI */
 104 static refcount_t *ppi_nmi_refs;
 105
 106 static struct gic_kvm_info gic_v3_kvm_info;
 107 static DEFINE_PER_CPU(bool, has_rss);
 108
 109 #define MPIDR_RS(mpidr)                 (((mpidr) & 0xF0UL) >> 4)
 110 #define gic_data_rdist()                (this_cpu_ptr(gic_data.rdists.rdist))
 111 #define gic_data_rdist_rd_base()        (gic_data_rdist()->rd_base)
 112 #define gic_data_rdist_sgi_base()       (gic_data_rdist_rd_base() + SZ_64K)
 113
 114 /* Our default, arbitrary priority value. Linux only uses one anyway. */
 115 #define DEFAULT_PMR_VALUE       0xf0
 116
 117 enum gic_intid_range {
 118         SGI_RANGE,
 119         PPI_RANGE,
 120         SPI_RANGE,
 121         EPPI_RANGE,
 122         ESPI_RANGE,
 123         LPI_RANGE,
 124         __INVALID_RANGE__
 125 };
 126
 127 static enum gic_intid_range __get_intid_range(irq_hw_number_t hwirq)
 128 {
 129         switch (hwirq) {
 130         case 0 ... 15:
 131                 return SGI_RANGE;
 132         case 16 ... 31:
 133                 return PPI_RANGE;
 134         case 32 ... 1019:
 135                 return SPI_RANGE;
 136         case EPPI_BASE_INTID ... (EPPI_BASE_INTID + 63):
 137                 return EPPI_RANGE;
 138         case ESPI_BASE_INTID ... (ESPI_BASE_INTID + 1023):
 139                 return ESPI_RANGE;
 140         case 8192 ... GENMASK(23, 0):
 141                 return LPI_RANGE;
 142         default:
 143                 return __INVALID_RANGE__;
 144         }
 145 }
 146
 147 static enum gic_intid_range get_intid_range(struct irq_data *d)
 148 {
 149         return __get_intid_range(d->hwirq);
 150 }
 151
 152 static inline unsigned int gic_irq(struct irq_data *d)
 153 {
 154         return d->hwirq;
 155 }
 156
 157 static inline bool gic_irq_in_rdist(struct irq_data *d)
 158 {
 159         switch (get_intid_range(d)) {
 160         case SGI_RANGE:
 161         case PPI_RANGE:
 162         case EPPI_RANGE:
 163                 return true;
 164         default:
 165                 return false;
 166         }
 167 }
 168
 169 static inline void __iomem *gic_dist_base(struct irq_data *d)
 170 {
 171         switch (get_intid_range(d)) {
 172         case SGI_RANGE:
 173         case PPI_RANGE:
 174         case EPPI_RANGE:
 175                 /* SGI+PPI -> SGI_base for this CPU */
 176                 return gic_data_rdist_sgi_base();
 177
 178         case SPI_RANGE:
 179         case ESPI_RANGE:
 180                 /* SPI -> dist_base */
 181                 return gic_data.dist_base;
 182
 183         default:
 184                 return NULL;
 185         }
 186 }
 187
 188 static void gic_do_wait_for_rwp(void __iomem *base)
 189 {
 190         u32 count = 1000000;    /* 1s! */
 191
 192         while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) {
 193                 count--;
 194                 if (!count) {
 195                         pr_err_ratelimited("RWP timeout, gone fishing\n");
 196                         return;
 197                 }
 198                 cpu_relax();
 199                 udelay(1);
 200         }
 201 }
 202
 203 /* Wait for completion of a distributor change */
 204 static void gic_dist_wait_for_rwp(void)
 205 {
 206         gic_do_wait_for_rwp(gic_data.dist_base);
 207 }
 208
 209 /* Wait for completion of a redistributor change */
 210 static void gic_redist_wait_for_rwp(void)
 211 {
 212         gic_do_wait_for_rwp(gic_data_rdist_rd_base());
 213 }
 214
 215 #ifdef CONFIG_ARM64
 216
 217 static u64 __maybe_unused gic_read_iar(void)
 218 {
 219         if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_23154))
 220                 return gic_read_iar_cavium_thunderx();
 221         else
 222                 return gic_read_iar_common();
 223 }
 224 #endif
 225
 226 static void gic_enable_redist(bool enable)
 227 {
 228         void __iomem *rbase;
 229         u32 count = 1000000;    /* 1s! */
 230         u32 val;
 231
 232         if (gic_data.flags & FLAGS_WORKAROUND_GICR_WAKER_MSM8996)
 233                 return;
 234
 235         rbase = gic_data_rdist_rd_base();
 236
 237         val = readl_relaxed(rbase + GICR_WAKER);
 238         if (enable)
 239                 /* Wake up this CPU redistributor */
 240                 val &= ~GICR_WAKER_ProcessorSleep;
 241         else
 242                 val |= GICR_WAKER_ProcessorSleep;
 243         writel_relaxed(val, rbase + GICR_WAKER);
 244
 245         if (!enable) {          /* Check that GICR_WAKER is writeable */
 246                 val = readl_relaxed(rbase + GICR_WAKER);
 247                 if (!(val & GICR_WAKER_ProcessorSleep))
 248                         return; /* No PM support in this redistributor */
 249         }
 250
 251         while (--count) {
 252                 val = readl_relaxed(rbase + GICR_WAKER);
 253                 if (enable ^ (bool)(val & GICR_WAKER_ChildrenAsleep))
 254                         break;
 255                 cpu_relax();
 256                 udelay(1);
 257         }
 258         if (!count)
 259                 pr_err_ratelimited("redistributor failed to %s...\n",
 260                                    enable ? "wakeup" : "sleep");
 261 }
 262
 263 /*
 264  * Routines to disable, enable, EOI and route interrupts
 265  */
 266 static u32 convert_offset_index(struct irq_data *d, u32 offset, u32 *index)
 267 {
 268         switch (get_intid_range(d)) {
 269         case SGI_RANGE:
 270         case PPI_RANGE:
 271         case SPI_RANGE:
 272                 *index = d->hwirq;
 273                 return offset;
 274         case EPPI_RANGE:
 275                 /*
 276                  * Contrary to the ESPI range, the EPPI range is contiguous
 277                  * to the PPI range in the registers, so let's adjust the
 278                  * displacement accordingly. Consistency is overrated.
 279                  */
 280                 *index = d->hwirq - EPPI_BASE_INTID + 32;
 281                 return offset;
 282         case ESPI_RANGE:
 283                 *index = d->hwirq - ESPI_BASE_INTID;
 284                 switch (offset) {
 285                 case GICD_ISENABLER:
 286                         return GICD_ISENABLERnE;
 287                 case GICD_ICENABLER:
 288                         return GICD_ICENABLERnE;
 289                 case GICD_ISPENDR:
 290                         return GICD_ISPENDRnE;
 291                 case GICD_ICPENDR:
 292                         return GICD_ICPENDRnE;
 293                 case GICD_ISACTIVER:
 294                         return GICD_ISACTIVERnE;
 295                 case GICD_ICACTIVER:
 296                         return GICD_ICACTIVERnE;
 297                 case GICD_IPRIORITYR:
 298                         return GICD_IPRIORITYRnE;
 299                 case GICD_ICFGR:
 300                         return GICD_ICFGRnE;
 301                 case GICD_IROUTER:
 302                         return GICD_IROUTERnE;
 303                 default:
 304                         break;
 305                 }
 306                 break;
 307         default:
 308                 break;
 309         }
 310
 311         WARN_ON(1);
 312         *index = d->hwirq;
 313         return offset;
 314 }
 315
 316 static int gic_peek_irq(struct irq_data *d, u32 offset)
 317 {
 318         void __iomem *base;
 319         u32 index, mask;
 320
 321         offset = convert_offset_index(d, offset, &index);
 322         mask = 1 << (index % 32);
 323
 324         if (gic_irq_in_rdist(d))
 325                 base = gic_data_rdist_sgi_base();
 326         else
 327                 base = gic_data.dist_base;
 328
 329         return !!(readl_relaxed(base + offset + (index / 32) * 4) & mask);
 330 }
 331
 332 static void gic_poke_irq(struct irq_data *d, u32 offset)
 333 {
 334         void (*rwp_wait)(void);
 335         void __iomem *base;
 336         u32 index, mask;
 337
 338         offset = convert_offset_index(d, offset, &index);
 339         mask = 1 << (index % 32);
 340
 341         if (gic_irq_in_rdist(d)) {
 342                 base = gic_data_rdist_sgi_base();
 343                 rwp_wait = gic_redist_wait_for_rwp;
 344         } else {
 345                 base = gic_data.dist_base;
 346                 rwp_wait = gic_dist_wait_for_rwp;
 347         }
 348
 349         writel_relaxed(mask, base + offset + (index / 32) * 4);
 350         rwp_wait();
 351 }
 352
 353 static void gic_mask_irq(struct irq_data *d)
 354 {
 355         gic_poke_irq(d, GICD_ICENABLER);
 356 }
 357
 358 static void gic_eoimode1_mask_irq(struct irq_data *d)
 359 {
 360         gic_mask_irq(d);
 361         /*
 362          * When masking a forwarded interrupt, make sure it is
 363          * deactivated as well.
 364          *
 365          * This ensures that an interrupt that is getting
 366          * disabled/masked will not get "stuck", because there is
 367          * noone to deactivate it (guest is being terminated).
 368          */
 369         if (irqd_is_forwarded_to_vcpu(d))
 370                 gic_poke_irq(d, GICD_ICACTIVER);
 371 }
 372
 373 static void gic_unmask_irq(struct irq_data *d)
 374 {
 375         gic_poke_irq(d, GICD_ISENABLER);
 376 }
 377
 378 static inline bool gic_supports_nmi(void)
 379 {
 380         return IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) &&
 381                static_branch_likely(&supports_pseudo_nmis);
 382 }
 383
 384 static int gic_irq_set_irqchip_state(struct irq_data *d,
 385                                      enum irqchip_irq_state which, bool val)
 386 {
 387         u32 reg;
 388
 389         if (d->hwirq >= 8192) /* SGI/PPI/SPI only */
 390                 return -EINVAL;
 391
 392         switch (which) {
 393         case IRQCHIP_STATE_PENDING:
 394                 reg = val ? GICD_ISPENDR : GICD_ICPENDR;
 395                 break;
 396
 397         case IRQCHIP_STATE_ACTIVE:
 398                 reg = val ? GICD_ISACTIVER : GICD_ICACTIVER;
 399                 break;
 400
 401         case IRQCHIP_STATE_MASKED:
 402                 reg = val ? GICD_ICENABLER : GICD_ISENABLER;
 403                 break;
 404
 405         default:
 406                 return -EINVAL;
 407         }
 408
 409         gic_poke_irq(d, reg);
 410         return 0;
 411 }
 412
 413 static int gic_irq_get_irqchip_state(struct irq_data *d,
 414                                      enum irqchip_irq_state which, bool *val)
 415 {
 416         if (d->hwirq >= 8192) /* PPI/SPI only */
 417                 return -EINVAL;
 418
 419         switch (which) {
 420         case IRQCHIP_STATE_PENDING:
 421                 *val = gic_peek_irq(d, GICD_ISPENDR);
 422                 break;
 423
 424         case IRQCHIP_STATE_ACTIVE:
 425                 *val = gic_peek_irq(d, GICD_ISACTIVER);
 426                 break;
 427
 428         case IRQCHIP_STATE_MASKED:
 429                 *val = !gic_peek_irq(d, GICD_ISENABLER);
 430                 break;
 431
 432         default:
 433                 return -EINVAL;
 434         }
 435
 436         return 0;
 437 }
 438
 439 static void gic_irq_set_prio(struct irq_data *d, u8 prio)
 440 {
 441         void __iomem *base = gic_dist_base(d);
 442         u32 offset, index;
 443
 444         offset = convert_offset_index(d, GICD_IPRIORITYR, &index);
 445
 446         writeb_relaxed(prio, base + offset + index);
 447 }
 448
 449 static u32 gic_get_ppi_index(struct irq_data *d)
 450 {
 451         switch (get_intid_range(d)) {
 452         case PPI_RANGE:
 453                 return d->hwirq - 16;
 454         case EPPI_RANGE:
 455                 return d->hwirq - EPPI_BASE_INTID + 16;
 456         default:
 457                 unreachable();
 458         }
 459 }
 460
 461 static int gic_irq_nmi_setup(struct irq_data *d)
 462 {
 463         struct irq_desc *desc = irq_to_desc(d->irq);
 464
 465         if (!gic_supports_nmi())
 466                 return -EINVAL;
 467
 468         if (gic_peek_irq(d, GICD_ISENABLER)) {
 469                 pr_err("Cannot set NMI property of enabled IRQ %u\n", d->irq);
 470                 return -EINVAL;
 471         }
 472
 473         /*
 474          * A secondary irq_chip should be in charge of LPI request,
 475          * it should not be possible to get there
 476          */
 477         if (WARN_ON(gic_irq(d) >= 8192))
 478                 return -EINVAL;
 479
 480         /* desc lock should already be held */
 481         if (gic_irq_in_rdist(d)) {
 482                 u32 idx = gic_get_ppi_index(d);
 483
 484                 /* Setting up PPI as NMI, only switch handler for first NMI */
 485                 if (!refcount_inc_not_zero(&ppi_nmi_refs[idx])) {
 486                         refcount_set(&ppi_nmi_refs[idx], 1);
 487                         desc->handle_irq = handle_percpu_devid_fasteoi_nmi;
 488                 }
 489         } else {
 490                 desc->handle_irq = handle_fasteoi_nmi;
 491         }
 492
 493         gic_irq_set_prio(d, GICD_INT_NMI_PRI);
 494
 495         return 0;
 496 }
 497
 498 static void gic_irq_nmi_teardown(struct irq_data *d)
 499 {
 500         struct irq_desc *desc = irq_to_desc(d->irq);
 501
 502         if (WARN_ON(!gic_supports_nmi()))
 503                 return;
 504
 505         if (gic_peek_irq(d, GICD_ISENABLER)) {
 506                 pr_err("Cannot set NMI property of enabled IRQ %u\n", d->irq);
 507                 return;
 508         }
 509
 510         /*
 511          * A secondary irq_chip should be in charge of LPI request,
 512          * it should not be possible to get there
 513          */
 514         if (WARN_ON(gic_irq(d) >= 8192))
 515                 return;
 516
 517         /* desc lock should already be held */
 518         if (gic_irq_in_rdist(d)) {
 519                 u32 idx = gic_get_ppi_index(d);
 520
 521                 /* Tearing down NMI, only switch handler for last NMI */
 522                 if (refcount_dec_and_test(&ppi_nmi_refs[idx]))
 523                         desc->handle_irq = handle_percpu_devid_irq;
 524         } else {
 525                 desc->handle_irq = handle_fasteoi_irq;
 526         }
 527
 528         gic_irq_set_prio(d, GICD_INT_DEF_PRI);
 529 }
 530
 531 static void gic_eoi_irq(struct irq_data *d)
 532 {
 533         gic_write_eoir(gic_irq(d));
 534 }
 535
 536 static void gic_eoimode1_eoi_irq(struct irq_data *d)
 537 {
 538         /*
 539          * No need to deactivate an LPI, or an interrupt that
 540          * is is getting forwarded to a vcpu.
 541          */
 542         if (gic_irq(d) >= 8192 || irqd_is_forwarded_to_vcpu(d))
 543                 return;
 544         gic_write_dir(gic_irq(d));
 545 }
 546
 547 static int gic_set_type(struct irq_data *d, unsigned int type)
 548 {
 549         enum gic_intid_range range;
 550         unsigned int irq = gic_irq(d);
 551         void (*rwp_wait)(void);
 552         void __iomem *base;
 553         u32 offset, index;
 554         int ret;
 555
 556         range = get_intid_range(d);
 557
 558         /* Interrupt configuration for SGIs can't be changed */
 559         if (range == SGI_RANGE)
 560                 return type != IRQ_TYPE_EDGE_RISING ? -EINVAL : 0;
 561
 562         /* SPIs have restrictions on the supported types */
 563         if ((range == SPI_RANGE || range == ESPI_RANGE) &&
 564             type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
 565                 return -EINVAL;
 566
 567         if (gic_irq_in_rdist(d)) {
 568                 base = gic_data_rdist_sgi_base();
 569                 rwp_wait = gic_redist_wait_for_rwp;
 570         } else {
 571                 base = gic_data.dist_base;
 572                 rwp_wait = gic_dist_wait_for_rwp;
 573         }
 574
 575         offset = convert_offset_index(d, GICD_ICFGR, &index);
 576
 577         ret = gic_configure_irq(index, type, base + offset, rwp_wait);
 578         if (ret && (range == PPI_RANGE || range == EPPI_RANGE)) {
 579                 /* Misconfigured PPIs are usually not fatal */
 580                 pr_warn("GIC: PPI INTID%d is secure or misconfigured\n", irq);
 581                 ret = 0;
 582         }
 583
 584         return ret;
 585 }
 586
 587 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
 588 {
 589         if (get_intid_range(d) == SGI_RANGE)
 590                 return -EINVAL;
 591
 592         if (vcpu)
 593                 irqd_set_forwarded_to_vcpu(d);
 594         else
 595                 irqd_clr_forwarded_to_vcpu(d);
 596         return 0;
 597 }
 598
 599 static u64 gic_mpidr_to_affinity(unsigned long mpidr)
 600 {
 601         u64 aff;
 602
 603         aff = ((u64)MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 |
 604                MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 605                MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8  |
 606                MPIDR_AFFINITY_LEVEL(mpidr, 0));
 607
 608         return aff;
 609 }
 610
 611 static void gic_deactivate_unhandled(u32 irqnr)
 612 {
 613         if (static_branch_likely(&supports_deactivate_key)) {
 614                 if (irqnr < 8192)
 615                         gic_write_dir(irqnr);
 616         } else {
 617                 gic_write_eoir(irqnr);
 618         }
 619 }
 620
 621 static inline void gic_handle_nmi(u32 irqnr, struct pt_regs *regs)
 622 {
 623         bool irqs_enabled = interrupts_enabled(regs);
 624         int err;
 625
 626         if (irqs_enabled)
 627                 nmi_enter();
 628
 629         if (static_branch_likely(&supports_deactivate_key))
 630                 gic_write_eoir(irqnr);
 631         /*
 632          * Leave the PSR.I bit set to prevent other NMIs to be
 633          * received while handling this one.
 634          * PSR.I will be restored when we ERET to the
 635          * interrupted context.
 636          */
 637         err = handle_domain_nmi(gic_data.domain, irqnr, regs);
 638         if (err)
 639                 gic_deactivate_unhandled(irqnr);
 640
 641         if (irqs_enabled)
 642                 nmi_exit();
 643 }
 644
 645 static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 646 {
 647         u32 irqnr;
 648
 649         irqnr = gic_read_iar();
 650
 651         if (gic_supports_nmi() &&
 652             unlikely(gic_read_rpr() == GICD_INT_NMI_PRI)) {
 653                 gic_handle_nmi(irqnr, regs);
 654                 return;
 655         }
 656
 657         if (gic_prio_masking_enabled()) {
 658                 gic_pmr_mask_irqs();
 659                 gic_arch_enable_irqs();
 660         }
 661
 662         /* Check for special IDs first */
 663         if ((irqnr >= 1020 && irqnr <= 1023))
 664                 return;
 665
 666         if (static_branch_likely(&supports_deactivate_key))
 667                 gic_write_eoir(irqnr);
 668         else
 669                 isb();
 670
 671         if (handle_domain_irq(gic_data.domain, irqnr, regs)) {
 672                 WARN_ONCE(true, "Unexpected interrupt received!\n");
 673                 gic_deactivate_unhandled(irqnr);
 674         }
 675 }
 676
 677 static u32 gic_get_pribits(void)
 678 {
 679         u32 pribits;
 680
 681         pribits = gic_read_ctlr();
 682         pribits &= ICC_CTLR_EL1_PRI_BITS_MASK;
 683         pribits >>= ICC_CTLR_EL1_PRI_BITS_SHIFT;
 684         pribits++;
 685
 686         return pribits;
 687 }
 688
 689 static bool gic_has_group0(void)
 690 {
 691         u32 val;
 692         u32 old_pmr;
 693
 694         old_pmr = gic_read_pmr();
 695
 696         /*
 697          * Let's find out if Group0 is under control of EL3 or not by
 698          * setting the highest possible, non-zero priority in PMR.
 699          *
 700          * If SCR_EL3.FIQ is set, the priority gets shifted down in
 701          * order for the CPU interface to set bit 7, and keep the
 702          * actual priority in the non-secure range. In the process, it
 703          * looses the least significant bit and the actual priority
 704          * becomes 0x80. Reading it back returns 0, indicating that
 705          * we're don't have access to Group0.
 706          */
 707         gic_write_pmr(BIT(8 - gic_get_pribits()));
 708         val = gic_read_pmr();
 709
 710         gic_write_pmr(old_pmr);
 711
 712         return val != 0;
 713 }
 714
 715 static void __init gic_dist_init(void)
 716 {
 717         unsigned int i;
 718         u64 affinity;
 719         void __iomem *base = gic_data.dist_base;
 720         u32 val;
 721
 722         /* Disable the distributor */
 723         writel_relaxed(0, base + GICD_CTLR);
 724         gic_dist_wait_for_rwp();
 725
 726         /*
 727          * Configure SPIs as non-secure Group-1. This will only matter
 728          * if the GIC only has a single security state. This will not
 729          * do the right thing if the kernel is running in secure mode,
 730          * but that's not the intended use case anyway.
 731          */
 732         for (i = 32; i < GIC_LINE_NR; i += 32)
 733                 writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
 734
 735         /* Extended SPI range, not handled by the GICv2/GICv3 common code */
 736         for (i = 0; i < GIC_ESPI_NR; i += 32) {
 737                 writel_relaxed(~0U, base + GICD_ICENABLERnE + i / 8);
 738                 writel_relaxed(~0U, base + GICD_ICACTIVERnE + i / 8);
 739         }
 740
 741         for (i = 0; i < GIC_ESPI_NR; i += 32)
 742                 writel_relaxed(~0U, base + GICD_IGROUPRnE + i / 8);
 743
 744         for (i = 0; i < GIC_ESPI_NR; i += 16)
 745                 writel_relaxed(0, base + GICD_ICFGRnE + i / 4);
 746
 747         for (i = 0; i < GIC_ESPI_NR; i += 4)
 748                 writel_relaxed(GICD_INT_DEF_PRI_X4, base + GICD_IPRIORITYRnE + i);
 749
 750         /* Now do the common stuff, and wait for the distributor to drain */
 751         gic_dist_config(base, GIC_LINE_NR, gic_dist_wait_for_rwp);
 752
 753         val = GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1;
 754         if (gic_data.rdists.gicd_typer2 & GICD_TYPER2_nASSGIcap) {
 755                 pr_info("Enabling SGIs without active state\n");
 756                 val |= GICD_CTLR_nASSGIreq;
 757         }
 758
 759         /* Enable distributor with ARE, Group1 */
 760         writel_relaxed(val, base + GICD_CTLR);
 761
 762         /*
 763          * Set all global interrupts to the boot CPU only. ARE must be
 764          * enabled.
 765          */
 766         affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
 767         for (i = 32; i < GIC_LINE_NR; i++)
 768                 gic_write_irouter(affinity, base + GICD_IROUTER + i * 8);
 769
 770         for (i = 0; i < GIC_ESPI_NR; i++)
 771                 gic_write_irouter(affinity, base + GICD_IROUTERnE + i * 8);
 772 }
 773
 774 static int gic_iterate_rdists(int (*fn)(struct redist_region *, void __iomem *))
 775 {
 776         int ret = -ENODEV;
 777         int i;
 778
 779         for (i = 0; i < gic_data.nr_redist_regions; i++) {
 780                 void __iomem *ptr = gic_data.redist_regions[i].redist_base;
 781                 u64 typer;
 782                 u32 reg;
 783
 784                 reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
 785                 if (reg != GIC_PIDR2_ARCH_GICv3 &&
 786                     reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */
 787                         pr_warn("No redistributor present @%p\n", ptr);
 788                         break;
 789                 }
 790
 791                 do {
 792                         typer = gic_read_typer(ptr + GICR_TYPER);
 793                         ret = fn(gic_data.redist_regions + i, ptr);
 794                         if (!ret)
 795                                 return 0;
 796
 797                         if (gic_data.redist_regions[i].single_redist)
 798                                 break;
 799
 800                         if (gic_data.redist_stride) {
 801                                 ptr += gic_data.redist_stride;
 802                         } else {
 803                                 ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
 804                                 if (typer & GICR_TYPER_VLPIS)
 805                                         ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
 806                         }
 807                 } while (!(typer & GICR_TYPER_LAST));
 808         }
 809
 810         return ret ? -ENODEV : 0;
 811 }
 812
 813 static int __gic_populate_rdist(struct redist_region *region, void __iomem *ptr)
 814 {
 815         unsigned long mpidr = cpu_logical_map(smp_processor_id());
 816         u64 typer;
 817         u32 aff;
 818
 819         /*
 820          * Convert affinity to a 32bit value that can be matched to
 821          * GICR_TYPER bits [63:32].
 822          */
 823         aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
 824                MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 825                MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
 826                MPIDR_AFFINITY_LEVEL(mpidr, 0));
 827
 828         typer = gic_read_typer(ptr + GICR_TYPER);
 829         if ((typer >> 32) == aff) {
 830                 u64 offset = ptr - region->redist_base;
 831                 raw_spin_lock_init(&gic_data_rdist()->rd_lock);
 832                 gic_data_rdist_rd_base() = ptr;
 833                 gic_data_rdist()->phys_base = region->phys_base + offset;
 834
 835                 pr_info("CPU%d: found redistributor %lx region %d:%pa\n",
 836                         smp_processor_id(), mpidr,
 837                         (int)(region - gic_data.redist_regions),
 838                         &gic_data_rdist()->phys_base);
 839                 return 0;
 840         }
 841
 842         /* Try next one */
 843         return 1;
 844 }
 845
 846 static int gic_populate_rdist(void)
 847 {
 848         if (gic_iterate_rdists(__gic_populate_rdist) == 0)
 849                 return 0;
 850
 851         /* We couldn't even deal with ourselves... */
 852         WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n",
 853              smp_processor_id(),
 854              (unsigned long)cpu_logical_map(smp_processor_id()));
 855         return -ENODEV;
 856 }
 857
 858 static int __gic_update_rdist_properties(struct redist_region *region,
 859                                          void __iomem *ptr)
 860 {
 861         u64 typer = gic_read_typer(ptr + GICR_TYPER);
 862
 863         gic_data.rdists.has_vlpis &= !!(typer & GICR_TYPER_VLPIS);
 864
 865         /* RVPEID implies some form of DirectLPI, no matter what the doc says... :-/ */
 866         gic_data.rdists.has_rvpeid &= !!(typer & GICR_TYPER_RVPEID);
 867         gic_data.rdists.has_direct_lpi &= (!!(typer & GICR_TYPER_DirectLPIS) |
 868                                            gic_data.rdists.has_rvpeid);
 869         gic_data.rdists.has_vpend_valid_dirty &= !!(typer & GICR_TYPER_DIRTY);
 870
 871         /* Detect non-sensical configurations */
 872         if (WARN_ON_ONCE(gic_data.rdists.has_rvpeid && !gic_data.rdists.has_vlpis)) {
 873                 gic_data.rdists.has_direct_lpi = false;
 874                 gic_data.rdists.has_vlpis = false;
 875                 gic_data.rdists.has_rvpeid = false;
 876         }
 877
 878         gic_data.ppi_nr = min(GICR_TYPER_NR_PPIS(typer), gic_data.ppi_nr);
 879
 880         return 1;
 881 }
 882
 883 static void gic_update_rdist_properties(void)
 884 {
 885         gic_data.ppi_nr = UINT_MAX;
 886         gic_iterate_rdists(__gic_update_rdist_properties);
 887         if (WARN_ON(gic_data.ppi_nr == UINT_MAX))
 888                 gic_data.ppi_nr = 0;
 889         pr_info("%d PPIs implemented\n", gic_data.ppi_nr);
 890         if (gic_data.rdists.has_vlpis)
 891                 pr_info("GICv4 features: %s%s%s\n",
 892                         gic_data.rdists.has_direct_lpi ? "DirectLPI " : "",
 893                         gic_data.rdists.has_rvpeid ? "RVPEID " : "",
 894                         gic_data.rdists.has_vpend_valid_dirty ? "Valid+Dirty " : "");
 895 }
 896
 897 /* Check whether it's single security state view */
 898 static inline bool gic_dist_security_disabled(void)
 899 {
 900         return readl_relaxed(gic_data.dist_base + GICD_CTLR) & GICD_CTLR_DS;
 901 }
 902
 903 static void gic_cpu_sys_reg_init(void)
 904 {
 905         int i, cpu = smp_processor_id();
 906         u64 mpidr = cpu_logical_map(cpu);
 907         u64 need_rss = MPIDR_RS(mpidr);
 908         bool group0;
 909         u32 pribits;
 910
 911         /*
 912          * Need to check that the SRE bit has actually been set. If
 913          * not, it means that SRE is disabled at EL2. We're going to
 914          * die painfully, and there is nothing we can do about it.
 915          *
 916          * Kindly inform the luser.
 917          */
 918         if (!gic_enable_sre())
 919                 pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
 920
 921         pribits = gic_get_pribits();
 922
 923         group0 = gic_has_group0();
 924
 925         /* Set priority mask register */
 926         if (!gic_prio_masking_enabled()) {
 927                 write_gicreg(DEFAULT_PMR_VALUE, ICC_PMR_EL1);
 928         } else if (gic_supports_nmi()) {
 929                 /*
 930                  * Mismatch configuration with boot CPU, the system is likely
 931                  * to die as interrupt masking will not work properly on all
 932                  * CPUs
 933                  *
 934                  * The boot CPU calls this function before enabling NMI support,
 935                  * and as a result we'll never see this warning in the boot path
 936                  * for that CPU.
 937                  */
 938                 if (static_branch_unlikely(&gic_nonsecure_priorities))
 939                         WARN_ON(!group0 || gic_dist_security_disabled());
 940                 else
 941                         WARN_ON(group0 && !gic_dist_security_disabled());
 942         }
 943
 944         /*
 945          * Some firmwares hand over to the kernel with the BPR changed from
 946          * its reset value (and with a value large enough to prevent
 947          * any pre-emptive interrupts from working at all). Writing a zero
 948          * to BPR restores is reset value.
 949          */
 950         gic_write_bpr1(0);
 951
 952         if (static_branch_likely(&supports_deactivate_key)) {
 953                 /* EOI drops priority only (mode 1) */
 954                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop);
 955         } else {
 956                 /* EOI deactivates interrupt too (mode 0) */
 957                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
 958         }
 959
 960         /* Always whack Group0 before Group1 */
 961         if (group0) {
 962                 switch(pribits) {
 963                 case 8:
 964                 case 7:
 965                         write_gicreg(0, ICC_AP0R3_EL1);
 966                         write_gicreg(0, ICC_AP0R2_EL1);
 967                         fallthrough;
 968                 case 6:
 969                         write_gicreg(0, ICC_AP0R1_EL1);
 970                         fallthrough;
 971                 case 5:
 972                 case 4:
 973                         write_gicreg(0, ICC_AP0R0_EL1);
 974                 }
 975
 976                 isb();
 977         }
 978
 979         switch(pribits) {
 980         case 8:
 981         case 7:
 982                 write_gicreg(0, ICC_AP1R3_EL1);
 983                 write_gicreg(0, ICC_AP1R2_EL1);
 984                 fallthrough;
 985         case 6:
 986                 write_gicreg(0, ICC_AP1R1_EL1);
 987                 fallthrough;
 988         case 5:
 989         case 4:
 990                 write_gicreg(0, ICC_AP1R0_EL1);
 991         }
 992
 993         isb();
 994
 995         /* ... and let's hit the road... */
 996         gic_write_grpen1(1);
 997
 998         /* Keep the RSS capability status in per_cpu variable */
 999         per_cpu(has_rss, cpu) = !!(gic_read_ctlr() & ICC_CTLR_EL1_RSS);
1000
1001         /* Check all the CPUs have capable of sending SGIs to other CPUs */
1002         for_each_online_cpu(i) {
1003                 bool have_rss = per_cpu(has_rss, i) && per_cpu(has_rss, cpu);
1004
1005                 need_rss |= MPIDR_RS(cpu_logical_map(i));
1006                 if (need_rss && (!have_rss))
1007                         pr_crit("CPU%d (%lx) can't SGI CPU%d (%lx), no RSS\n",
1008                                 cpu, (unsigned long)mpidr,
1009                                 i, (unsigned long)cpu_logical_map(i));
1010         }
1011
1012         /**
1013          * GIC spec says, when ICC_CTLR_EL1.RSS==1 and GICD_TYPER.RSS==0,
1014          * writing ICC_ASGI1R_EL1 register with RS != 0 is a CONSTRAINED
1015          * UNPREDICTABLE choice of :
1016          *   - The write is ignored.
1017          *   - The RS field is treated as 0.
1018          */
1019         if (need_rss && (!gic_data.has_rss))
1020                 pr_crit_once("RSS is required but GICD doesn't support it\n");
1021 }
1022
1023 static bool gicv3_nolpi;
1024
1025 static int __init gicv3_nolpi_cfg(char *buf)
1026 {
1027         return strtobool(buf, &gicv3_nolpi);
1028 }
1029 early_param("irqchip.gicv3_nolpi", gicv3_nolpi_cfg);
1030
1031 static int gic_dist_supports_lpis(void)
1032 {
1033         return (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) &&
1034                 !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS) &&
1035                 !gicv3_nolpi);
1036 }
1037
1038 static void gic_cpu_init(void)
1039 {
1040         void __iomem *rbase;
1041         int i;
1042
1043         /* Register ourselves with the rest of the world */
1044         if (gic_populate_rdist())
1045                 return;
1046
1047         gic_enable_redist(true);
1048
1049         WARN((gic_data.ppi_nr > 16 || GIC_ESPI_NR != 0) &&
1050              !(gic_read_ctlr() & ICC_CTLR_EL1_ExtRange),
1051              "Distributor has extended ranges, but CPU%d doesn't\n",
1052              smp_processor_id());
1053
1054         rbase = gic_data_rdist_sgi_base();
1055
1056         /* Configure SGIs/PPIs as non-secure Group-1 */
1057         for (i = 0; i < gic_data.ppi_nr + 16; i += 32)
1058                 writel_relaxed(~0, rbase + GICR_IGROUPR0 + i / 8);
1059
1060         gic_cpu_config(rbase, gic_data.ppi_nr + 16, gic_redist_wait_for_rwp);
1061
1062         /* initialise system registers */
1063         gic_cpu_sys_reg_init();
1064 }
1065
1066 #ifdef CONFIG_SMP
1067
1068 #define MPIDR_TO_SGI_RS(mpidr)  (MPIDR_RS(mpidr) << ICC_SGI1R_RS_SHIFT)
1069 #define MPIDR_TO_SGI_CLUSTER_ID(mpidr)  ((mpidr) & ~0xFUL)
1070
1071 static int gic_starting_cpu(unsigned int cpu)
1072 {
1073         gic_cpu_init();
1074
1075         if (gic_dist_supports_lpis())
1076                 its_cpu_init();
1077
1078         return 0;
1079 }
1080
1081 static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask,
1082                                    unsigned long cluster_id)
1083 {
1084         int next_cpu, cpu = *base_cpu;
1085         unsigned long mpidr = cpu_logical_map(cpu);
1086         u16 tlist = 0;
1087
1088         while (cpu < nr_cpu_ids) {
1089                 tlist |= 1 << (mpidr & 0xf);
1090
1091                 next_cpu = cpumask_next(cpu, mask);
1092                 if (next_cpu >= nr_cpu_ids)
1093                         goto out;
1094                 cpu = next_cpu;
1095
1096                 mpidr = cpu_logical_map(cpu);
1097
1098                 if (cluster_id != MPIDR_TO_SGI_CLUSTER_ID(mpidr)) {
1099                         cpu--;
1100                         goto out;
1101                 }
1102         }
1103 out:
1104         *base_cpu = cpu;
1105         return tlist;
1106 }
1107
1108 #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
1109         (MPIDR_AFFINITY_LEVEL(cluster_id, level) \
1110                 << ICC_SGI1R_AFFINITY_## level ##_SHIFT)
1111
1112 static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
1113 {
1114         u64 val;
1115
1116         val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3)     |
1117                MPIDR_TO_SGI_AFFINITY(cluster_id, 2)     |
1118                irq << ICC_SGI1R_SGI_ID_SHIFT            |
1119                MPIDR_TO_SGI_AFFINITY(cluster_id, 1)     |
1120                MPIDR_TO_SGI_RS(cluster_id)              |
1121                tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
1122
1123         pr_devel("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
1124         gic_write_sgi1r(val);
1125 }
1126
1127 static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask)
1128 {
1129         int cpu;
1130
1131         if (WARN_ON(d->hwirq >= 16))
1132                 return;
1133
1134         /*
1135          * Ensure that stores to Normal memory are visible to the
1136          * other CPUs before issuing the IPI.
1137          */
1138         wmb();
1139
1140         for_each_cpu(cpu, mask) {
1141                 u64 cluster_id = MPIDR_TO_SGI_CLUSTER_ID(cpu_logical_map(cpu));
1142                 u16 tlist;
1143
1144                 tlist = gic_compute_target_list(&cpu, mask, cluster_id);
1145                 gic_send_sgi(cluster_id, tlist, d->hwirq);
1146         }
1147
1148         /* Force the above writes to ICC_SGI1R_EL1 to be executed */
1149         isb();
1150 }
1151
1152 static void __init gic_smp_init(void)
1153 {
1154         struct irq_fwspec sgi_fwspec = {
1155                 .fwnode         = gic_data.fwnode,
1156                 .param_count    = 1,
1157         };
1158         int base_sgi;
1159
1160         cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
1161                                   "irqchip/arm/gicv3:starting",
1162                                   gic_starting_cpu, NULL);
1163
1164         /* Register all 8 non-secure SGIs */
1165         base_sgi = __irq_domain_alloc_irqs(gic_data.domain, -1, 8,
1166                                            NUMA_NO_NODE, &sgi_fwspec,
1167                                            false, NULL);
1168         if (WARN_ON(base_sgi <= 0))
1169                 return;
1170
1171         set_smp_ipi_range(base_sgi, 8);
1172 }
1173
1174 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
1175                             bool force)
1176 {
1177         unsigned int cpu;
1178         u32 offset, index;
1179         void __iomem *reg;
1180         int enabled;
1181         u64 val;
1182
1183         if (force)
1184                 cpu = cpumask_first(mask_val);
1185         else
1186                 cpu = cpumask_any_and(mask_val, cpu_online_mask);
1187
1188         if (cpu >= nr_cpu_ids)
1189                 return -EINVAL;
1190
1191         if (gic_irq_in_rdist(d))
1192                 return -EINVAL;
1193
1194         /* If interrupt was enabled, disable it first */
1195         enabled = gic_peek_irq(d, GICD_ISENABLER);
1196         if (enabled)
1197                 gic_mask_irq(d);
1198
1199         offset = convert_offset_index(d, GICD_IROUTER, &index);
1200         reg = gic_dist_base(d) + offset + (index * 8);
1201         val = gic_mpidr_to_affinity(cpu_logical_map(cpu));
1202
1203         gic_write_irouter(val, reg);
1204
1205         /*
1206          * If the interrupt was enabled, enabled it again. Otherwise,
1207          * just wait for the distributor to have digested our changes.
1208          */
1209         if (enabled)
1210                 gic_unmask_irq(d);
1211         else
1212                 gic_dist_wait_for_rwp();
1213
1214         irq_data_update_effective_affinity(d, cpumask_of(cpu));
1215
1216         return IRQ_SET_MASK_OK_DONE;
1217 }
1218 #else
1219 #define gic_set_affinity        NULL
1220 #define gic_ipi_send_mask       NULL
1221 #define gic_smp_init()          do { } while(0)
1222 #endif
1223
1224 static int gic_retrigger(struct irq_data *data)
1225 {
1226         return !gic_irq_set_irqchip_state(data, IRQCHIP_STATE_PENDING, true);
1227 }
1228
1229 #ifdef CONFIG_CPU_PM
1230 static int gic_cpu_pm_notifier(struct notifier_block *self,
1231                                unsigned long cmd, void *v)
1232 {
1233         if (cmd == CPU_PM_EXIT) {
1234                 if (gic_dist_security_disabled())
1235                         gic_enable_redist(true);
1236                 gic_cpu_sys_reg_init();
1237         } else if (cmd == CPU_PM_ENTER && gic_dist_security_disabled()) {
1238                 gic_write_grpen1(0);
1239                 gic_enable_redist(false);
1240         }
1241         return NOTIFY_OK;
1242 }
1243
1244 static struct notifier_block gic_cpu_pm_notifier_block = {
1245         .notifier_call = gic_cpu_pm_notifier,
1246 };
1247
1248 static void gic_cpu_pm_init(void)
1249 {
1250         cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
1251 }
1252
1253 #else
1254 static inline void gic_cpu_pm_init(void) { }
1255 #endif /* CONFIG_CPU_PM */
1256
1257 static struct irq_chip gic_chip = {
1258         .name                   = "GICv3",
1259         .irq_mask               = gic_mask_irq,
1260         .irq_unmask             = gic_unmask_irq,
1261         .irq_eoi                = gic_eoi_irq,
1262         .irq_set_type           = gic_set_type,
1263         .irq_set_affinity       = gic_set_affinity,
1264         .irq_retrigger          = gic_retrigger,
1265         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
1266         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
1267         .irq_nmi_setup          = gic_irq_nmi_setup,
1268         .irq_nmi_teardown       = gic_irq_nmi_teardown,
1269         .ipi_send_mask          = gic_ipi_send_mask,
1270         .flags                  = IRQCHIP_SET_TYPE_MASKED |
1271                                   IRQCHIP_SKIP_SET_WAKE |
1272                                   IRQCHIP_MASK_ON_SUSPEND,
1273 };
1274
1275 static struct irq_chip gic_eoimode1_chip = {
1276         .name                   = "GICv3",
1277         .irq_mask               = gic_eoimode1_mask_irq,
1278         .irq_unmask             = gic_unmask_irq,
1279         .irq_eoi                = gic_eoimode1_eoi_irq,
1280         .irq_set_type           = gic_set_type,
1281         .irq_set_affinity       = gic_set_affinity,
1282         .irq_retrigger          = gic_retrigger,
1283         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
1284         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
1285         .irq_set_vcpu_affinity  = gic_irq_set_vcpu_affinity,
1286         .irq_nmi_setup          = gic_irq_nmi_setup,
1287         .irq_nmi_teardown       = gic_irq_nmi_teardown,
1288         .ipi_send_mask          = gic_ipi_send_mask,
1289         .flags                  = IRQCHIP_SET_TYPE_MASKED |
1290                                   IRQCHIP_SKIP_SET_WAKE |
1291                                   IRQCHIP_MASK_ON_SUSPEND,
1292 };
1293
1294 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
1295                               irq_hw_number_t hw)
1296 {
1297         struct irq_chip *chip = &gic_chip;
1298         struct irq_data *irqd = irq_desc_get_irq_data(irq_to_desc(irq));
1299
1300         if (static_branch_likely(&supports_deactivate_key))
1301                 chip = &gic_eoimode1_chip;
1302
1303         switch (__get_intid_range(hw)) {
1304         case SGI_RANGE:
1305                 irq_set_percpu_devid(irq);
1306                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
1307                                     handle_percpu_devid_fasteoi_ipi,
1308                                     NULL, NULL);
1309                 break;
1310
1311         case PPI_RANGE:
1312         case EPPI_RANGE:
1313                 irq_set_percpu_devid(irq);
1314                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
1315                                     handle_percpu_devid_irq, NULL, NULL);
1316                 break;
1317
1318         case SPI_RANGE:
1319         case ESPI_RANGE:
1320                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
1321                                     handle_fasteoi_irq, NULL, NULL);
1322                 irq_set_probe(irq);
1323                 irqd_set_single_target(irqd);
1324                 break;
1325
1326         case LPI_RANGE:
1327                 if (!gic_dist_supports_lpis())
1328                         return -EPERM;
1329                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
1330                                     handle_fasteoi_irq, NULL, NULL);
1331                 break;
1332
1333         default:
1334                 return -EPERM;
1335         }
1336
1337         /* Prevents SW retriggers which mess up the ACK/EOI ordering */
1338         irqd_set_handle_enforce_irqctx(irqd);
1339         return 0;
1340 }
1341
1342 static int gic_irq_domain_translate(struct irq_domain *d,
1343                                     struct irq_fwspec *fwspec,
1344                                     unsigned long *hwirq,
1345                                     unsigned int *type)
1346 {
1347         if (fwspec->param_count == 1 && fwspec->param[0] < 16) {
1348                 *hwirq = fwspec->param[0];
1349                 *type = IRQ_TYPE_EDGE_RISING;
1350                 return 0;
1351         }
1352
1353         if (is_of_node(fwspec->fwnode)) {
1354                 if (fwspec->param_count < 3)
1355                         return -EINVAL;
1356
1357                 switch (fwspec->param[0]) {
1358                 case 0:                 /* SPI */
1359                         *hwirq = fwspec->param[1] + 32;
1360                         break;
1361                 case 1:                 /* PPI */
1362                         *hwirq = fwspec->param[1] + 16;
1363                         break;
1364                 case 2:                 /* ESPI */
1365                         *hwirq = fwspec->param[1] + ESPI_BASE_INTID;
1366                         break;
1367                 case 3:                 /* EPPI */
1368                         *hwirq = fwspec->param[1] + EPPI_BASE_INTID;
1369                         break;
1370                 case GIC_IRQ_TYPE_LPI:  /* LPI */
1371                         *hwirq = fwspec->param[1];
1372                         break;
1373                 case GIC_IRQ_TYPE_PARTITION:
1374                         *hwirq = fwspec->param[1];
1375                         if (fwspec->param[1] >= 16)
1376                                 *hwirq += EPPI_BASE_INTID - 16;
1377                         else
1378                                 *hwirq += 16;
1379                         break;
1380                 default:
1381                         return -EINVAL;
1382                 }
1383
1384                 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1385
1386                 /*
1387                  * Make it clear that broken DTs are... broken.
1388                  * Partitionned PPIs are an unfortunate exception.
1389                  */
1390                 WARN_ON(*type == IRQ_TYPE_NONE &&
1391                         fwspec->param[0] != GIC_IRQ_TYPE_PARTITION);
1392                 return 0;
1393         }
1394
1395         if (is_fwnode_irqchip(fwspec->fwnode)) {
1396                 if(fwspec->param_count != 2)
1397                         return -EINVAL;
1398
1399                 *hwirq = fwspec->param[0];
1400                 *type = fwspec->param[1];
1401
1402                 WARN_ON(*type == IRQ_TYPE_NONE);
1403                 return 0;
1404         }
1405
1406         return -EINVAL;
1407 }
1408
1409 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
1410                                 unsigned int nr_irqs, void *arg)
1411 {
1412         int i, ret;
1413         irq_hw_number_t hwirq;
1414         unsigned int type = IRQ_TYPE_NONE;
1415         struct irq_fwspec *fwspec = arg;
1416
1417         ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
1418         if (ret)
1419                 return ret;
1420
1421         for (i = 0; i < nr_irqs; i++) {
1422                 ret = gic_irq_domain_map(domain, virq + i, hwirq + i);
1423                 if (ret)
1424                         return ret;
1425         }
1426
1427         return 0;
1428 }
1429
1430 static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
1431                                 unsigned int nr_irqs)
1432 {
1433         int i;
1434
1435         for (i = 0; i < nr_irqs; i++) {
1436                 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
1437                 irq_set_handler(virq + i, NULL);
1438                 irq_domain_reset_irq_data(d);
1439         }
1440 }
1441
1442 static int gic_irq_domain_select(struct irq_domain *d,
1443                                  struct irq_fwspec *fwspec,
1444                                  enum irq_domain_bus_token bus_token)
1445 {
1446         /* Not for us */
1447         if (fwspec->fwnode != d->fwnode)
1448                 return 0;
1449
1450         /* If this is not DT, then we have a single domain */
1451         if (!is_of_node(fwspec->fwnode))
1452                 return 1;
1453
1454         /*
1455          * If this is a PPI and we have a 4th (non-null) parameter,
1456          * then we need to match the partition domain.
1457          */
1458         if (fwspec->param_count >= 4 &&
1459             fwspec->param[0] == 1 && fwspec->param[3] != 0 &&
1460             gic_data.ppi_descs)
1461                 return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]);
1462
1463         return d == gic_data.domain;
1464 }
1465
1466 static const struct irq_domain_ops gic_irq_domain_ops = {
1467         .translate = gic_irq_domain_translate,
1468         .alloc = gic_irq_domain_alloc,
1469         .free = gic_irq_domain_free,
1470         .select = gic_irq_domain_select,
1471 };
1472
1473 static int partition_domain_translate(struct irq_domain *d,
1474                                       struct irq_fwspec *fwspec,
1475                                       unsigned long *hwirq,
1476                                       unsigned int *type)
1477 {
1478         struct device_node *np;
1479         int ret;
1480
1481         if (!gic_data.ppi_descs)
1482                 return -ENOMEM;
1483
1484         np = of_find_node_by_phandle(fwspec->param[3]);
1485         if (WARN_ON(!np))
1486                 return -EINVAL;
1487
1488         ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]],
1489                                      of_node_to_fwnode(np));
1490         if (ret < 0)
1491                 return ret;
1492
1493         *hwirq = ret;
1494         *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1495
1496         return 0;
1497 }
1498
1499 static const struct irq_domain_ops partition_domain_ops = {
1500         .translate = partition_domain_translate,
1501         .select = gic_irq_domain_select,
1502 };
1503
1504 static bool gic_enable_quirk_msm8996(void *data)
1505 {
1506         struct gic_chip_data *d = data;
1507
1508         d->flags |= FLAGS_WORKAROUND_GICR_WAKER_MSM8996;
1509
1510         return true;
1511 }
1512
1513 static bool gic_enable_quirk_cavium_38539(void *data)
1514 {
1515         struct gic_chip_data *d = data;
1516
1517         d->flags |= FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539;
1518
1519         return true;
1520 }
1521
1522 static bool gic_enable_quirk_hip06_07(void *data)
1523 {
1524         struct gic_chip_data *d = data;
1525
1526         /*
1527          * HIP06 GICD_IIDR clashes with GIC-600 product number (despite
1528          * not being an actual ARM implementation). The saving grace is
1529          * that GIC-600 doesn't have ESPI, so nothing to do in that case.
1530          * HIP07 doesn't even have a proper IIDR, and still pretends to
1531          * have ESPI. In both cases, put them right.
1532          */
1533         if (d->rdists.gicd_typer & GICD_TYPER_ESPI) {
1534                 /* Zero both ESPI and the RES0 field next to it... */
1535                 d->rdists.gicd_typer &= ~GENMASK(9, 8);
1536                 return true;
1537         }
1538
1539         return false;
1540 }
1541
1542 static const struct gic_quirk gic_quirks[] = {
1543         {
1544                 .desc   = "GICv3: Qualcomm MSM8996 broken firmware",
1545                 .compatible = "qcom,msm8996-gic-v3",
1546                 .init   = gic_enable_quirk_msm8996,
1547         },
1548         {
1549                 .desc   = "GICv3: HIP06 erratum 161010803",
1550                 .iidr   = 0x0204043b,
1551                 .mask   = 0xffffffff,
1552                 .init   = gic_enable_quirk_hip06_07,
1553         },
1554         {
1555                 .desc   = "GICv3: HIP07 erratum 161010803",
1556                 .iidr   = 0x00000000,
1557                 .mask   = 0xffffffff,
1558                 .init   = gic_enable_quirk_hip06_07,
1559         },
1560         {
1561                 /*
1562                  * Reserved register accesses generate a Synchronous
1563                  * External Abort. This erratum applies to:
1564                  * - ThunderX: CN88xx
1565                  * - OCTEON TX: CN83xx, CN81xx
1566                  * - OCTEON TX2: CN93xx, CN96xx, CN98xx, CNF95xx*
1567                  */
1568                 .desc   = "GICv3: Cavium erratum 38539",
1569                 .iidr   = 0xa000034c,
1570                 .mask   = 0xe8f00fff,
1571                 .init   = gic_enable_quirk_cavium_38539,
1572         },
1573         {
1574         }
1575 };
1576
1577 static void gic_enable_nmi_support(void)
1578 {
1579         int i;
1580
1581         if (!gic_prio_masking_enabled())
1582                 return;
1583
1584         ppi_nmi_refs = kcalloc(gic_data.ppi_nr, sizeof(*ppi_nmi_refs), GFP_KERNEL);
1585         if (!ppi_nmi_refs)
1586                 return;
1587
1588         for (i = 0; i < gic_data.ppi_nr; i++)
1589                 refcount_set(&ppi_nmi_refs[i], 0);
1590
1591         /*
1592          * Linux itself doesn't use 1:N distribution, so has no need to
1593          * set PMHE. The only reason to have it set is if EL3 requires it
1594          * (and we can't change it).
1595          */
1596         if (gic_read_ctlr() & ICC_CTLR_EL1_PMHE_MASK)
1597                 static_branch_enable(&gic_pmr_sync);
1598
1599         pr_info("Pseudo-NMIs enabled using %s ICC_PMR_EL1 synchronisation\n",
1600                 static_branch_unlikely(&gic_pmr_sync) ? "forced" : "relaxed");
1601
1602         /*
1603          * How priority values are used by the GIC depends on two things:
1604          * the security state of the GIC (controlled by the GICD_CTRL.DS bit)
1605          * and if Group 0 interrupts can be delivered to Linux in the non-secure
1606          * world as FIQs (controlled by the SCR_EL3.FIQ bit). These affect the
1607          * the ICC_PMR_EL1 register and the priority that software assigns to
1608          * interrupts:
1609          *
1610          * GICD_CTRL.DS | SCR_EL3.FIQ | ICC_PMR_EL1 | Group 1 priority
1611          * -----------------------------------------------------------
1612          *      1       |      -      |  unchanged  |    unchanged
1613          * -----------------------------------------------------------
1614          *      0       |      1      |  non-secure |    non-secure
1615          * -----------------------------------------------------------
1616          *      0       |      0      |  unchanged  |    non-secure
1617          *
1618          * where non-secure means that the value is right-shifted by one and the
1619          * MSB bit set, to make it fit in the non-secure priority range.
1620          *
1621          * In the first two cases, where ICC_PMR_EL1 and the interrupt priority
1622          * are both either modified or unchanged, we can use the same set of
1623          * priorities.
1624          *
1625          * In the last case, where only the interrupt priorities are modified to
1626          * be in the non-secure range, we use a different PMR value to mask IRQs
1627          * and the rest of the values that we use remain unchanged.
1628          */
1629         if (gic_has_group0() && !gic_dist_security_disabled())
1630                 static_branch_enable(&gic_nonsecure_priorities);
1631
1632         static_branch_enable(&supports_pseudo_nmis);
1633
1634         if (static_branch_likely(&supports_deactivate_key))
1635                 gic_eoimode1_chip.flags |= IRQCHIP_SUPPORTS_NMI;
1636         else
1637                 gic_chip.flags |= IRQCHIP_SUPPORTS_NMI;
1638 }
1639
1640 static int __init gic_init_bases(void __iomem *dist_base,
1641                                  struct redist_region *rdist_regs,
1642                                  u32 nr_redist_regions,
1643                                  u64 redist_stride,
1644                                  struct fwnode_handle *handle)
1645 {
1646         u32 typer;
1647         int err;
1648
1649         if (!is_hyp_mode_available())
1650                 static_branch_disable(&supports_deactivate_key);
1651
1652         if (static_branch_likely(&supports_deactivate_key))
1653                 pr_info("GIC: Using split EOI/Deactivate mode\n");
1654
1655         gic_data.fwnode = handle;
1656         gic_data.dist_base = dist_base;
1657         gic_data.redist_regions = rdist_regs;
1658         gic_data.nr_redist_regions = nr_redist_regions;
1659         gic_data.redist_stride = redist_stride;
1660
1661         /*
1662          * Find out how many interrupts are supported.
1663          */
1664         typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
1665         gic_data.rdists.gicd_typer = typer;
1666
1667         gic_enable_quirks(readl_relaxed(gic_data.dist_base + GICD_IIDR),
1668                           gic_quirks, &gic_data);
1669
1670         pr_info("%d SPIs implemented\n", GIC_LINE_NR - 32);
1671         pr_info("%d Extended SPIs implemented\n", GIC_ESPI_NR);
1672
1673         /*
1674          * ThunderX1 explodes on reading GICD_TYPER2, in violation of the
1675          * architecture spec (which says that reserved registers are RES0).
1676          */
1677         if (!(gic_data.flags & FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539))
1678                 gic_data.rdists.gicd_typer2 = readl_relaxed(gic_data.dist_base + GICD_TYPER2);
1679
1680         gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
1681                                                  &gic_data);
1682         gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
1683         gic_data.rdists.has_rvpeid = true;
1684         gic_data.rdists.has_vlpis = true;
1685         gic_data.rdists.has_direct_lpi = true;
1686         gic_data.rdists.has_vpend_valid_dirty = true;
1687
1688         if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
1689                 err = -ENOMEM;
1690                 goto out_free;
1691         }
1692
1693         irq_domain_update_bus_token(gic_data.domain, DOMAIN_BUS_WIRED);
1694
1695         gic_data.has_rss = !!(typer & GICD_TYPER_RSS);
1696         pr_info("Distributor has %sRange Selector support\n",
1697                 gic_data.has_rss ? "" : "no ");
1698
1699         if (typer & GICD_TYPER_MBIS) {
1700                 err = mbi_init(handle, gic_data.domain);
1701                 if (err)
1702                         pr_err("Failed to initialize MBIs\n");
1703         }
1704
1705         set_handle_irq(gic_handle_irq);
1706
1707         gic_update_rdist_properties();
1708
1709         gic_dist_init();
1710         gic_cpu_init();
1711         gic_smp_init();
1712         gic_cpu_pm_init();
1713
1714         if (gic_dist_supports_lpis()) {
1715                 its_init(handle, &gic_data.rdists, gic_data.domain);
1716                 its_cpu_init();
1717         } else {
1718                 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1719                         gicv2m_init(handle, gic_data.domain);
1720         }
1721
1722         gic_enable_nmi_support();
1723
1724         return 0;
1725
1726 out_free:
1727         if (gic_data.domain)
1728                 irq_domain_remove(gic_data.domain);
1729         free_percpu(gic_data.rdists.rdist);
1730         return err;
1731 }
1732
1733 static int __init gic_validate_dist_version(void __iomem *dist_base)
1734 {
1735         u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1736
1737         if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4)
1738                 return -ENODEV;
1739
1740         return 0;
1741 }
1742
1743 /* Create all possible partitions at boot time */
1744 static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
1745 {
1746         struct device_node *parts_node, *child_part;
1747         int part_idx = 0, i;
1748         int nr_parts;
1749         struct partition_affinity *parts;
1750
1751         parts_node = of_get_child_by_name(gic_node, "ppi-partitions");
1752         if (!parts_node)
1753                 return;
1754
1755         gic_data.ppi_descs = kcalloc(gic_data.ppi_nr, sizeof(*gic_data.ppi_descs), GFP_KERNEL);
1756         if (!gic_data.ppi_descs)
1757                 return;
1758
1759         nr_parts = of_get_child_count(parts_node);
1760
1761         if (!nr_parts)
1762                 goto out_put_node;
1763
1764         parts = kcalloc(nr_parts, sizeof(*parts), GFP_KERNEL);
1765         if (WARN_ON(!parts))
1766                 goto out_put_node;
1767
1768         for_each_child_of_node(parts_node, child_part) {
1769                 struct partition_affinity *part;
1770                 int n;
1771
1772                 part = &parts[part_idx];
1773
1774                 part->partition_id = of_node_to_fwnode(child_part);
1775
1776                 pr_info("GIC: PPI partition %pOFn[%d] { ",
1777                         child_part, part_idx);
1778
1779                 n = of_property_count_elems_of_size(child_part, "affinity",
1780                                                     sizeof(u32));
1781                 WARN_ON(n <= 0);
1782
1783                 for (i = 0; i < n; i++) {
1784                         int err, cpu;
1785                         u32 cpu_phandle;
1786                         struct device_node *cpu_node;
1787
1788                         err = of_property_read_u32_index(child_part, "affinity",
1789                                                          i, &cpu_phandle);
1790                         if (WARN_ON(err))
1791                                 continue;
1792
1793                         cpu_node = of_find_node_by_phandle(cpu_phandle);
1794                         if (WARN_ON(!cpu_node))
1795                                 continue;
1796
1797                         cpu = of_cpu_node_to_id(cpu_node);
1798                         if (WARN_ON(cpu < 0))
1799                                 continue;
1800
1801                         pr_cont("%pOF[%d] ", cpu_node, cpu);
1802
1803                         cpumask_set_cpu(cpu, &part->mask);
1804                 }
1805
1806                 pr_cont("}\n");
1807                 part_idx++;
1808         }
1809
1810         for (i = 0; i < gic_data.ppi_nr; i++) {
1811                 unsigned int irq;
1812                 struct partition_desc *desc;
1813                 struct irq_fwspec ppi_fwspec = {
1814                         .fwnode         = gic_data.fwnode,
1815                         .param_count    = 3,
1816                         .param          = {
1817                                 [0]     = GIC_IRQ_TYPE_PARTITION,
1818                                 [1]     = i,
1819                                 [2]     = IRQ_TYPE_NONE,
1820                         },
1821                 };
1822
1823                 irq = irq_create_fwspec_mapping(&ppi_fwspec);
1824                 if (WARN_ON(!irq))
1825                         continue;
1826                 desc = partition_create_desc(gic_data.fwnode, parts, nr_parts,
1827                                              irq, &partition_domain_ops);
1828                 if (WARN_ON(!desc))
1829                         continue;
1830
1831                 gic_data.ppi_descs[i] = desc;
1832         }
1833
1834 out_put_node:
1835         of_node_put(parts_node);
1836 }
1837
1838 static void __init gic_of_setup_kvm_info(struct device_node *node)
1839 {
1840         int ret;
1841         struct resource r;
1842         u32 gicv_idx;
1843
1844         gic_v3_kvm_info.type = GIC_V3;
1845
1846         gic_v3_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1847         if (!gic_v3_kvm_info.maint_irq)
1848                 return;
1849
1850         if (of_property_read_u32(node, "#redistributor-regions",
1851                                  &gicv_idx))
1852                 gicv_idx = 1;
1853
1854         gicv_idx += 3;  /* Also skip GICD, GICC, GICH */
1855         ret = of_address_to_resource(node, gicv_idx, &r);
1856         if (!ret)
1857                 gic_v3_kvm_info.vcpu = r;
1858
1859         gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
1860         gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;
1861         gic_set_kvm_info(&gic_v3_kvm_info);
1862 }
1863
1864 static int __init gic_of_init(struct device_node *node, struct device_node *parent)
1865 {
1866         void __iomem *dist_base;
1867         struct redist_region *rdist_regs;
1868         u64 redist_stride;
1869         u32 nr_redist_regions;
1870         int err, i;
1871
1872         dist_base = of_iomap(node, 0);
1873         if (!dist_base) {
1874                 pr_err("%pOF: unable to map gic dist registers\n", node);
1875                 return -ENXIO;
1876         }
1877
1878         err = gic_validate_dist_version(dist_base);
1879         if (err) {
1880                 pr_err("%pOF: no distributor detected, giving up\n", node);
1881                 goto out_unmap_dist;
1882         }
1883
1884         if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
1885                 nr_redist_regions = 1;
1886
1887         rdist_regs = kcalloc(nr_redist_regions, sizeof(*rdist_regs),
1888                              GFP_KERNEL);
1889         if (!rdist_regs) {
1890                 err = -ENOMEM;
1891                 goto out_unmap_dist;
1892         }
1893
1894         for (i = 0; i < nr_redist_regions; i++) {
1895                 struct resource res;
1896                 int ret;
1897
1898                 ret = of_address_to_resource(node, 1 + i, &res);
1899                 rdist_regs[i].redist_base = of_iomap(node, 1 + i);
1900                 if (ret || !rdist_regs[i].redist_base) {
1901                         pr_err("%pOF: couldn't map region %d\n", node, i);
1902                         err = -ENODEV;
1903                         goto out_unmap_rdist;
1904                 }
1905                 rdist_regs[i].phys_base = res.start;
1906         }
1907
1908         if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
1909                 redist_stride = 0;
1910
1911         gic_enable_of_quirks(node, gic_quirks, &gic_data);
1912
1913         err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions,
1914                              redist_stride, &node->fwnode);
1915         if (err)
1916                 goto out_unmap_rdist;
1917
1918         gic_populate_ppi_partitions(node);
1919
1920         if (static_branch_likely(&supports_deactivate_key))
1921                 gic_of_setup_kvm_info(node);
1922         return 0;
1923
1924 out_unmap_rdist:
1925         for (i = 0; i < nr_redist_regions; i++)
1926                 if (rdist_regs[i].redist_base)
1927                         iounmap(rdist_regs[i].redist_base);
1928         kfree(rdist_regs);
1929 out_unmap_dist:
1930         iounmap(dist_base);
1931         return err;
1932 }
1933
1934 IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);
1935
1936 #ifdef CONFIG_ACPI
1937 static struct
1938 {
1939         void __iomem *dist_base;
1940         struct redist_region *redist_regs;
1941         u32 nr_redist_regions;
1942         bool single_redist;
1943         int enabled_rdists;
1944         u32 maint_irq;
1945         int maint_irq_mode;
1946         phys_addr_t vcpu_base;
1947 } acpi_data __initdata;
1948
1949 static void __init
1950 gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base)
1951 {
1952         static int count = 0;
1953
1954         acpi_data.redist_regs[count].phys_base = phys_base;
1955         acpi_data.redist_regs[count].redist_base = redist_base;
1956         acpi_data.redist_regs[count].single_redist = acpi_data.single_redist;
1957         count++;
1958 }
1959
1960 static int __init
1961 gic_acpi_parse_madt_redist(union acpi_subtable_headers *header,
1962                            const unsigned long end)
1963 {
1964         struct acpi_madt_generic_redistributor *redist =
1965                         (struct acpi_madt_generic_redistributor *)header;
1966         void __iomem *redist_base;
1967
1968         redist_base = ioremap(redist->base_address, redist->length);
1969         if (!redist_base) {
1970                 pr_err("Couldn't map GICR region @%llx\n", redist->base_address);
1971                 return -ENOMEM;
1972         }
1973
1974         gic_acpi_register_redist(redist->base_address, redist_base);
1975         return 0;
1976 }
1977
1978 static int __init
1979 gic_acpi_parse_madt_gicc(union acpi_subtable_headers *header,
1980                          const unsigned long end)
1981 {
1982         struct acpi_madt_generic_interrupt *gicc =
1983                                 (struct acpi_madt_generic_interrupt *)header;
1984         u32 reg = readl_relaxed(acpi_data.dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1985         u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2;
1986         void __iomem *redist_base;
1987
1988         /* GICC entry which has !ACPI_MADT_ENABLED is not unusable so skip */
1989         if (!(gicc->flags & ACPI_MADT_ENABLED))
1990                 return 0;
1991
1992         redist_base = ioremap(gicc->gicr_base_address, size);
1993         if (!redist_base)
1994                 return -ENOMEM;
1995
1996         gic_acpi_register_redist(gicc->gicr_base_address, redist_base);
1997         return 0;
1998 }
1999
2000 static int __init gic_acpi_collect_gicr_base(void)
2001 {
2002         acpi_tbl_entry_handler redist_parser;
2003         enum acpi_madt_type type;
2004
2005         if (acpi_data.single_redist) {
2006                 type = ACPI_MADT_TYPE_GENERIC_INTERRUPT;
2007                 redist_parser = gic_acpi_parse_madt_gicc;
2008         } else {
2009                 type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR;
2010                 redist_parser = gic_acpi_parse_madt_redist;
2011         }
2012
2013         /* Collect redistributor base addresses in GICR entries */
2014         if (acpi_table_parse_madt(type, redist_parser, 0) > 0)
2015                 return 0;
2016
2017         pr_info("No valid GICR entries exist\n");
2018         return -ENODEV;
2019 }
2020
2021 static int __init gic_acpi_match_gicr(union acpi_subtable_headers *header,
2022                                   const unsigned long end)
2023 {
2024         /* Subtable presence means that redist exists, that's it */
2025         return 0;
2026 }
2027
2028 static int __init gic_acpi_match_gicc(union acpi_subtable_headers *header,
2029                                       const unsigned long end)
2030 {
2031         struct acpi_madt_generic_interrupt *gicc =
2032                                 (struct acpi_madt_generic_interrupt *)header;
2033
2034         /*
2035          * If GICC is enabled and has valid gicr base address, then it means
2036          * GICR base is presented via GICC
2037          */
2038         if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) {
2039                 acpi_data.enabled_rdists++;
2040                 return 0;
2041         }
2042
2043         /*
2044          * It's perfectly valid firmware can pass disabled GICC entry, driver
2045          * should not treat as errors, skip the entry instead of probe fail.
2046          */
2047         if (!(gicc->flags & ACPI_MADT_ENABLED))
2048                 return 0;
2049
2050         return -ENODEV;
2051 }
2052
2053 static int __init gic_acpi_count_gicr_regions(void)
2054 {
2055         int count;
2056
2057         /*
2058          * Count how many redistributor regions we have. It is not allowed
2059          * to mix redistributor description, GICR and GICC subtables have to be
2060          * mutually exclusive.
2061          */
2062         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
2063                                       gic_acpi_match_gicr, 0);
2064         if (count > 0) {
2065                 acpi_data.single_redist = false;
2066                 return count;
2067         }
2068
2069         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
2070                                       gic_acpi_match_gicc, 0);
2071         if (count > 0) {
2072                 acpi_data.single_redist = true;
2073                 count = acpi_data.enabled_rdists;
2074         }
2075
2076         return count;
2077 }
2078
2079 static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header,
2080                                            struct acpi_probe_entry *ape)
2081 {
2082         struct acpi_madt_generic_distributor *dist;
2083         int count;
2084
2085         dist = (struct acpi_madt_generic_distributor *)header;
2086         if (dist->version != ape->driver_data)
2087                 return false;
2088
2089         /* We need to do that exercise anyway, the sooner the better */
2090         count = gic_acpi_count_gicr_regions();
2091         if (count <= 0)
2092                 return false;
2093
2094         acpi_data.nr_redist_regions = count;
2095         return true;
2096 }
2097
2098 static int __init gic_acpi_parse_virt_madt_gicc(union acpi_subtable_headers *header,
2099                                                 const unsigned long end)
2100 {
2101         struct acpi_madt_generic_interrupt *gicc =
2102                 (struct acpi_madt_generic_interrupt *)header;
2103         int maint_irq_mode;
2104         static int first_madt = true;
2105
2106         /* Skip unusable CPUs */
2107         if (!(gicc->flags & ACPI_MADT_ENABLED))
2108                 return 0;
2109
2110         maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
2111                 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
2112
2113         if (first_madt) {
2114                 first_madt = false;
2115
2116                 acpi_data.maint_irq = gicc->vgic_interrupt;
2117                 acpi_data.maint_irq_mode = maint_irq_mode;
2118                 acpi_data.vcpu_base = gicc->gicv_base_address;
2119
2120                 return 0;
2121         }
2122
2123         /*
2124          * The maintenance interrupt and GICV should be the same for every CPU
2125          */
2126         if ((acpi_data.maint_irq != gicc->vgic_interrupt) ||
2127             (acpi_data.maint_irq_mode != maint_irq_mode) ||
2128             (acpi_data.vcpu_base != gicc->gicv_base_address))
2129                 return -EINVAL;
2130
2131         return 0;
2132 }
2133
2134 static bool __init gic_acpi_collect_virt_info(void)
2135 {
2136         int count;
2137
2138         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
2139                                       gic_acpi_parse_virt_madt_gicc, 0);
2140
2141         return (count > 0);
2142 }
2143
2144 #define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K)
2145 #define ACPI_GICV2_VCTRL_MEM_SIZE       (SZ_4K)
2146 #define ACPI_GICV2_VCPU_MEM_SIZE        (SZ_8K)
2147
2148 static void __init gic_acpi_setup_kvm_info(void)
2149 {
2150         int irq;
2151
2152         if (!gic_acpi_collect_virt_info()) {
2153                 pr_warn("Unable to get hardware information used for virtualization\n");
2154                 return;
2155         }
2156
2157         gic_v3_kvm_info.type = GIC_V3;
2158
2159         irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
2160                                 acpi_data.maint_irq_mode,
2161                                 ACPI_ACTIVE_HIGH);
2162         if (irq <= 0)
2163                 return;
2164
2165         gic_v3_kvm_info.maint_irq = irq;
2166
2167         if (acpi_data.vcpu_base) {
2168                 struct resource *vcpu = &gic_v3_kvm_info.vcpu;
2169
2170                 vcpu->flags = IORESOURCE_MEM;
2171                 vcpu->start = acpi_data.vcpu_base;
2172                 vcpu->end = vcpu->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
2173         }
2174
2175         gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
2176         gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;
2177         gic_set_kvm_info(&gic_v3_kvm_info);
2178 }
2179
2180 static int __init
2181 gic_acpi_init(union acpi_subtable_headers *header, const unsigned long end)
2182 {
2183         struct acpi_madt_generic_distributor *dist;
2184         struct fwnode_handle *domain_handle;
2185         size_t size;
2186         int i, err;
2187
2188         /* Get distributor base address */
2189         dist = (struct acpi_madt_generic_distributor *)header;
2190         acpi_data.dist_base = ioremap(dist->base_address,
2191                                       ACPI_GICV3_DIST_MEM_SIZE);
2192         if (!acpi_data.dist_base) {
2193                 pr_err("Unable to map GICD registers\n");
2194                 return -ENOMEM;
2195         }
2196
2197         err = gic_validate_dist_version(acpi_data.dist_base);
2198         if (err) {
2199                 pr_err("No distributor detected at @%p, giving up\n",
2200                        acpi_data.dist_base);
2201                 goto out_dist_unmap;
2202         }
2203
2204         size = sizeof(*acpi_data.redist_regs) * acpi_data.nr_redist_regions;
2205         acpi_data.redist_regs = kzalloc(size, GFP_KERNEL);
2206         if (!acpi_data.redist_regs) {
2207                 err = -ENOMEM;
2208                 goto out_dist_unmap;
2209         }
2210
2211         err = gic_acpi_collect_gicr_base();
2212         if (err)
2213                 goto out_redist_unmap;
2214
2215         domain_handle = irq_domain_alloc_fwnode(&dist->base_address);
2216         if (!domain_handle) {
2217                 err = -ENOMEM;
2218                 goto out_redist_unmap;
2219         }
2220
2221         err = gic_init_bases(acpi_data.dist_base, acpi_data.redist_regs,
2222                              acpi_data.nr_redist_regions, 0, domain_handle);
2223         if (err)
2224                 goto out_fwhandle_free;
2225
2226         acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
2227
2228         if (static_branch_likely(&supports_deactivate_key))
2229                 gic_acpi_setup_kvm_info();
2230
2231         return 0;
2232
2233 out_fwhandle_free:
2234         irq_domain_free_fwnode(domain_handle);
2235 out_redist_unmap:
2236         for (i = 0; i < acpi_data.nr_redist_regions; i++)
2237                 if (acpi_data.redist_regs[i].redist_base)
2238                         iounmap(acpi_data.redist_regs[i].redist_base);
2239         kfree(acpi_data.redist_regs);
2240 out_dist_unmap:
2241         iounmap(acpi_data.dist_base);
2242         return err;
2243 }
2244 IRQCHIP_ACPI_DECLARE(gic_v3, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
2245                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V3,
2246                      gic_acpi_init);
2247 IRQCHIP_ACPI_DECLARE(gic_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
2248                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V4,
2249                      gic_acpi_init);
2250 IRQCHIP_ACPI_DECLARE(gic_v3_or_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
2251                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_NONE,
2252                      gic_acpi_init);
2253 #endif