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 written 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 unchanged 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 u32 do_read_iar(struct pt_regs *regs)
 646 {
 647         u32 iar;
 648
 649         if (gic_supports_nmi() && unlikely(!interrupts_enabled(regs))) {
 650                 u64 pmr;
 651
 652                 /*
 653                  * We were in a context with IRQs disabled. However, the
 654                  * entry code has set PMR to a value that allows any
 655                  * interrupt to be acknowledged, and not just NMIs. This can
 656                  * lead to surprising effects if the NMI has been retired in
 657                  * the meantime, and that there is an IRQ pending. The IRQ
 658                  * would then be taken in NMI context, something that nobody
 659                  * wants to debug twice.
 660                  *
 661                  * Until we sort this, drop PMR again to a level that will
 662                  * actually only allow NMIs before reading IAR, and then
 663                  * restore it to what it was.
 664                  */
 665                 pmr = gic_read_pmr();
 666                 gic_pmr_mask_irqs();
 667                 isb();
 668
 669                 iar = gic_read_iar();
 670
 671                 gic_write_pmr(pmr);
 672         } else {
 673                 iar = gic_read_iar();
 674         }
 675
 676         return iar;
 677 }
 678
 679 static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 680 {
 681         u32 irqnr;
 682
 683         irqnr = do_read_iar(regs);
 684
 685         /* Check for special IDs first */
 686         if ((irqnr >= 1020 && irqnr <= 1023))
 687                 return;
 688
 689         if (gic_supports_nmi() &&
 690             unlikely(gic_read_rpr() == GICD_INT_NMI_PRI)) {
 691                 gic_handle_nmi(irqnr, regs);
 692                 return;
 693         }
 694
 695         if (gic_prio_masking_enabled()) {
 696                 gic_pmr_mask_irqs();
 697                 gic_arch_enable_irqs();
 698         }
 699
 700         if (static_branch_likely(&supports_deactivate_key))
 701                 gic_write_eoir(irqnr);
 702         else
 703                 isb();
 704
 705         if (handle_domain_irq(gic_data.domain, irqnr, regs)) {
 706                 WARN_ONCE(true, "Unexpected interrupt received!\n");
 707                 gic_deactivate_unhandled(irqnr);
 708         }
 709 }
 710
 711 static u32 gic_get_pribits(void)
 712 {
 713         u32 pribits;
 714
 715         pribits = gic_read_ctlr();
 716         pribits &= ICC_CTLR_EL1_PRI_BITS_MASK;
 717         pribits >>= ICC_CTLR_EL1_PRI_BITS_SHIFT;
 718         pribits++;
 719
 720         return pribits;
 721 }
 722
 723 static bool gic_has_group0(void)
 724 {
 725         u32 val;
 726         u32 old_pmr;
 727
 728         old_pmr = gic_read_pmr();
 729
 730         /*
 731          * Let's find out if Group0 is under control of EL3 or not by
 732          * setting the highest possible, non-zero priority in PMR.
 733          *
 734          * If SCR_EL3.FIQ is set, the priority gets shifted down in
 735          * order for the CPU interface to set bit 7, and keep the
 736          * actual priority in the non-secure range. In the process, it
 737          * looses the least significant bit and the actual priority
 738          * becomes 0x80. Reading it back returns 0, indicating that
 739          * we're don't have access to Group0.
 740          */
 741         gic_write_pmr(BIT(8 - gic_get_pribits()));
 742         val = gic_read_pmr();
 743
 744         gic_write_pmr(old_pmr);
 745
 746         return val != 0;
 747 }
 748
 749 static void __init gic_dist_init(void)
 750 {
 751         unsigned int i;
 752         u64 affinity;
 753         void __iomem *base = gic_data.dist_base;
 754         u32 val;
 755
 756         /* Disable the distributor */
 757         writel_relaxed(0, base + GICD_CTLR);
 758         gic_dist_wait_for_rwp();
 759
 760         /*
 761          * Configure SPIs as non-secure Group-1. This will only matter
 762          * if the GIC only has a single security state. This will not
 763          * do the right thing if the kernel is running in secure mode,
 764          * but that's not the intended use case anyway.
 765          */
 766         for (i = 32; i < GIC_LINE_NR; i += 32)
 767                 writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
 768
 769         /* Extended SPI range, not handled by the GICv2/GICv3 common code */
 770         for (i = 0; i < GIC_ESPI_NR; i += 32) {
 771                 writel_relaxed(~0U, base + GICD_ICENABLERnE + i / 8);
 772                 writel_relaxed(~0U, base + GICD_ICACTIVERnE + i / 8);
 773         }
 774
 775         for (i = 0; i < GIC_ESPI_NR; i += 32)
 776                 writel_relaxed(~0U, base + GICD_IGROUPRnE + i / 8);
 777
 778         for (i = 0; i < GIC_ESPI_NR; i += 16)
 779                 writel_relaxed(0, base + GICD_ICFGRnE + i / 4);
 780
 781         for (i = 0; i < GIC_ESPI_NR; i += 4)
 782                 writel_relaxed(GICD_INT_DEF_PRI_X4, base + GICD_IPRIORITYRnE + i);
 783
 784         /* Now do the common stuff, and wait for the distributor to drain */
 785         gic_dist_config(base, GIC_LINE_NR, gic_dist_wait_for_rwp);
 786
 787         val = GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1;
 788         if (gic_data.rdists.gicd_typer2 & GICD_TYPER2_nASSGIcap) {
 789                 pr_info("Enabling SGIs without active state\n");
 790                 val |= GICD_CTLR_nASSGIreq;
 791         }
 792
 793         /* Enable distributor with ARE, Group1 */
 794         writel_relaxed(val, base + GICD_CTLR);
 795
 796         /*
 797          * Set all global interrupts to the boot CPU only. ARE must be
 798          * enabled.
 799          */
 800         affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
 801         for (i = 32; i < GIC_LINE_NR; i++)
 802                 gic_write_irouter(affinity, base + GICD_IROUTER + i * 8);
 803
 804         for (i = 0; i < GIC_ESPI_NR; i++)
 805                 gic_write_irouter(affinity, base + GICD_IROUTERnE + i * 8);
 806 }
 807
 808 static int gic_iterate_rdists(int (*fn)(struct redist_region *, void __iomem *))
 809 {
 810         int ret = -ENODEV;
 811         int i;
 812
 813         for (i = 0; i < gic_data.nr_redist_regions; i++) {
 814                 void __iomem *ptr = gic_data.redist_regions[i].redist_base;
 815                 u64 typer;
 816                 u32 reg;
 817
 818                 reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
 819                 if (reg != GIC_PIDR2_ARCH_GICv3 &&
 820                     reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */
 821                         pr_warn("No redistributor present @%p\n", ptr);
 822                         break;
 823                 }
 824
 825                 do {
 826                         typer = gic_read_typer(ptr + GICR_TYPER);
 827                         ret = fn(gic_data.redist_regions + i, ptr);
 828                         if (!ret)
 829                                 return 0;
 830
 831                         if (gic_data.redist_regions[i].single_redist)
 832                                 break;
 833
 834                         if (gic_data.redist_stride) {
 835                                 ptr += gic_data.redist_stride;
 836                         } else {
 837                                 ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
 838                                 if (typer & GICR_TYPER_VLPIS)
 839                                         ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
 840                         }
 841                 } while (!(typer & GICR_TYPER_LAST));
 842         }
 843
 844         return ret ? -ENODEV : 0;
 845 }
 846
 847 static int __gic_populate_rdist(struct redist_region *region, void __iomem *ptr)
 848 {
 849         unsigned long mpidr = cpu_logical_map(smp_processor_id());
 850         u64 typer;
 851         u32 aff;
 852
 853         /*
 854          * Convert affinity to a 32bit value that can be matched to
 855          * GICR_TYPER bits [63:32].
 856          */
 857         aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
 858                MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 859                MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
 860                MPIDR_AFFINITY_LEVEL(mpidr, 0));
 861
 862         typer = gic_read_typer(ptr + GICR_TYPER);
 863         if ((typer >> 32) == aff) {
 864                 u64 offset = ptr - region->redist_base;
 865                 raw_spin_lock_init(&gic_data_rdist()->rd_lock);
 866                 gic_data_rdist_rd_base() = ptr;
 867                 gic_data_rdist()->phys_base = region->phys_base + offset;
 868
 869                 pr_info("CPU%d: found redistributor %lx region %d:%pa\n",
 870                         smp_processor_id(), mpidr,
 871                         (int)(region - gic_data.redist_regions),
 872                         &gic_data_rdist()->phys_base);
 873                 return 0;
 874         }
 875
 876         /* Try next one */
 877         return 1;
 878 }
 879
 880 static int gic_populate_rdist(void)
 881 {
 882         if (gic_iterate_rdists(__gic_populate_rdist) == 0)
 883                 return 0;
 884
 885         /* We couldn't even deal with ourselves... */
 886         WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n",
 887              smp_processor_id(),
 888              (unsigned long)cpu_logical_map(smp_processor_id()));
 889         return -ENODEV;
 890 }
 891
 892 static int __gic_update_rdist_properties(struct redist_region *region,
 893                                          void __iomem *ptr)
 894 {
 895         u64 typer = gic_read_typer(ptr + GICR_TYPER);
 896
 897         gic_data.rdists.has_vlpis &= !!(typer & GICR_TYPER_VLPIS);
 898
 899         /* RVPEID implies some form of DirectLPI, no matter what the doc says... :-/ */
 900         gic_data.rdists.has_rvpeid &= !!(typer & GICR_TYPER_RVPEID);
 901         gic_data.rdists.has_direct_lpi &= (!!(typer & GICR_TYPER_DirectLPIS) |
 902                                            gic_data.rdists.has_rvpeid);
 903         gic_data.rdists.has_vpend_valid_dirty &= !!(typer & GICR_TYPER_DIRTY);
 904
 905         /* Detect non-sensical configurations */
 906         if (WARN_ON_ONCE(gic_data.rdists.has_rvpeid && !gic_data.rdists.has_vlpis)) {
 907                 gic_data.rdists.has_direct_lpi = false;
 908                 gic_data.rdists.has_vlpis = false;
 909                 gic_data.rdists.has_rvpeid = false;
 910         }
 911
 912         gic_data.ppi_nr = min(GICR_TYPER_NR_PPIS(typer), gic_data.ppi_nr);
 913
 914         return 1;
 915 }
 916
 917 static void gic_update_rdist_properties(void)
 918 {
 919         gic_data.ppi_nr = UINT_MAX;
 920         gic_iterate_rdists(__gic_update_rdist_properties);
 921         if (WARN_ON(gic_data.ppi_nr == UINT_MAX))
 922                 gic_data.ppi_nr = 0;
 923         pr_info("%d PPIs implemented\n", gic_data.ppi_nr);
 924         if (gic_data.rdists.has_vlpis)
 925                 pr_info("GICv4 features: %s%s%s\n",
 926                         gic_data.rdists.has_direct_lpi ? "DirectLPI " : "",
 927                         gic_data.rdists.has_rvpeid ? "RVPEID " : "",
 928                         gic_data.rdists.has_vpend_valid_dirty ? "Valid+Dirty " : "");
 929 }
 930
 931 /* Check whether it's single security state view */
 932 static inline bool gic_dist_security_disabled(void)
 933 {
 934         return readl_relaxed(gic_data.dist_base + GICD_CTLR) & GICD_CTLR_DS;
 935 }
 936
 937 static void gic_cpu_sys_reg_init(void)
 938 {
 939         int i, cpu = smp_processor_id();
 940         u64 mpidr = cpu_logical_map(cpu);
 941         u64 need_rss = MPIDR_RS(mpidr);
 942         bool group0;
 943         u32 pribits;
 944
 945         /*
 946          * Need to check that the SRE bit has actually been set. If
 947          * not, it means that SRE is disabled at EL2. We're going to
 948          * die painfully, and there is nothing we can do about it.
 949          *
 950          * Kindly inform the luser.
 951          */
 952         if (!gic_enable_sre())
 953                 pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
 954
 955         pribits = gic_get_pribits();
 956
 957         group0 = gic_has_group0();
 958
 959         /* Set priority mask register */
 960         if (!gic_prio_masking_enabled()) {
 961                 write_gicreg(DEFAULT_PMR_VALUE, ICC_PMR_EL1);
 962         } else if (gic_supports_nmi()) {
 963                 /*
 964                  * Mismatch configuration with boot CPU, the system is likely
 965                  * to die as interrupt masking will not work properly on all
 966                  * CPUs
 967                  *
 968                  * The boot CPU calls this function before enabling NMI support,
 969                  * and as a result we'll never see this warning in the boot path
 970                  * for that CPU.
 971                  */
 972                 if (static_branch_unlikely(&gic_nonsecure_priorities))
 973                         WARN_ON(!group0 || gic_dist_security_disabled());
 974                 else
 975                         WARN_ON(group0 && !gic_dist_security_disabled());
 976         }
 977
 978         /*
 979          * Some firmwares hand over to the kernel with the BPR changed from
 980          * its reset value (and with a value large enough to prevent
 981          * any pre-emptive interrupts from working at all). Writing a zero
 982          * to BPR restores is reset value.
 983          */
 984         gic_write_bpr1(0);
 985
 986         if (static_branch_likely(&supports_deactivate_key)) {
 987                 /* EOI drops priority only (mode 1) */
 988                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop);
 989         } else {
 990                 /* EOI deactivates interrupt too (mode 0) */
 991                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
 992         }
 993
 994         /* Always whack Group0 before Group1 */
 995         if (group0) {
 996                 switch(pribits) {
 997                 case 8:
 998                 case 7:
 999                         write_gicreg(0, ICC_AP0R3_EL1);
1000                         write_gicreg(0, ICC_AP0R2_EL1);
1001                         fallthrough;
1002                 case 6:
1003                         write_gicreg(0, ICC_AP0R1_EL1);
1004                         fallthrough;
1005                 case 5:
1006                 case 4:
1007                         write_gicreg(0, ICC_AP0R0_EL1);
1008                 }
1009
1010                 isb();
1011         }
1012
1013         switch(pribits) {
1014         case 8:
1015         case 7:
1016                 write_gicreg(0, ICC_AP1R3_EL1);
1017                 write_gicreg(0, ICC_AP1R2_EL1);
1018                 fallthrough;
1019         case 6:
1020                 write_gicreg(0, ICC_AP1R1_EL1);
1021                 fallthrough;
1022         case 5:
1023         case 4:
1024                 write_gicreg(0, ICC_AP1R0_EL1);
1025         }
1026
1027         isb();
1028
1029         /* ... and let's hit the road... */
1030         gic_write_grpen1(1);
1031
1032         /* Keep the RSS capability status in per_cpu variable */
1033         per_cpu(has_rss, cpu) = !!(gic_read_ctlr() & ICC_CTLR_EL1_RSS);
1034
1035         /* Check all the CPUs have capable of sending SGIs to other CPUs */
1036         for_each_online_cpu(i) {
1037                 bool have_rss = per_cpu(has_rss, i) && per_cpu(has_rss, cpu);
1038
1039                 need_rss |= MPIDR_RS(cpu_logical_map(i));
1040                 if (need_rss && (!have_rss))
1041                         pr_crit("CPU%d (%lx) can't SGI CPU%d (%lx), no RSS\n",
1042                                 cpu, (unsigned long)mpidr,
1043                                 i, (unsigned long)cpu_logical_map(i));
1044         }
1045
1046         /**
1047          * GIC spec says, when ICC_CTLR_EL1.RSS==1 and GICD_TYPER.RSS==0,
1048          * writing ICC_ASGI1R_EL1 register with RS != 0 is a CONSTRAINED
1049          * UNPREDICTABLE choice of :
1050          *   - The write is ignored.
1051          *   - The RS field is treated as 0.
1052          */
1053         if (need_rss && (!gic_data.has_rss))
1054                 pr_crit_once("RSS is required but GICD doesn't support it\n");
1055 }
1056
1057 static bool gicv3_nolpi;
1058
1059 static int __init gicv3_nolpi_cfg(char *buf)
1060 {
1061         return strtobool(buf, &gicv3_nolpi);
1062 }
1063 early_param("irqchip.gicv3_nolpi", gicv3_nolpi_cfg);
1064
1065 static int gic_dist_supports_lpis(void)
1066 {
1067         return (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) &&
1068                 !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS) &&
1069                 !gicv3_nolpi);
1070 }
1071
1072 static void gic_cpu_init(void)
1073 {
1074         void __iomem *rbase;
1075         int i;
1076
1077         /* Register ourselves with the rest of the world */
1078         if (gic_populate_rdist())
1079                 return;
1080
1081         gic_enable_redist(true);
1082
1083         WARN((gic_data.ppi_nr > 16 || GIC_ESPI_NR != 0) &&
1084              !(gic_read_ctlr() & ICC_CTLR_EL1_ExtRange),
1085              "Distributor has extended ranges, but CPU%d doesn't\n",
1086              smp_processor_id());
1087
1088         rbase = gic_data_rdist_sgi_base();
1089
1090         /* Configure SGIs/PPIs as non-secure Group-1 */
1091         for (i = 0; i < gic_data.ppi_nr + 16; i += 32)
1092                 writel_relaxed(~0, rbase + GICR_IGROUPR0 + i / 8);
1093
1094         gic_cpu_config(rbase, gic_data.ppi_nr + 16, gic_redist_wait_for_rwp);
1095
1096         /* initialise system registers */
1097         gic_cpu_sys_reg_init();
1098 }
1099
1100 #ifdef CONFIG_SMP
1101
1102 #define MPIDR_TO_SGI_RS(mpidr)  (MPIDR_RS(mpidr) << ICC_SGI1R_RS_SHIFT)
1103 #define MPIDR_TO_SGI_CLUSTER_ID(mpidr)  ((mpidr) & ~0xFUL)
1104
1105 static int gic_starting_cpu(unsigned int cpu)
1106 {
1107         gic_cpu_init();
1108
1109         if (gic_dist_supports_lpis())
1110                 its_cpu_init();
1111
1112         return 0;
1113 }
1114
1115 static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask,
1116                                    unsigned long cluster_id)
1117 {
1118         int next_cpu, cpu = *base_cpu;
1119         unsigned long mpidr = cpu_logical_map(cpu);
1120         u16 tlist = 0;
1121
1122         while (cpu < nr_cpu_ids) {
1123                 tlist |= 1 << (mpidr & 0xf);
1124
1125                 next_cpu = cpumask_next(cpu, mask);
1126                 if (next_cpu >= nr_cpu_ids)
1127                         goto out;
1128                 cpu = next_cpu;
1129
1130                 mpidr = cpu_logical_map(cpu);
1131
1132                 if (cluster_id != MPIDR_TO_SGI_CLUSTER_ID(mpidr)) {
1133                         cpu--;
1134                         goto out;
1135                 }
1136         }
1137 out:
1138         *base_cpu = cpu;
1139         return tlist;
1140 }
1141
1142 #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
1143         (MPIDR_AFFINITY_LEVEL(cluster_id, level) \
1144                 << ICC_SGI1R_AFFINITY_## level ##_SHIFT)
1145
1146 static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
1147 {
1148         u64 val;
1149
1150         val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3)     |
1151                MPIDR_TO_SGI_AFFINITY(cluster_id, 2)     |
1152                irq << ICC_SGI1R_SGI_ID_SHIFT            |
1153                MPIDR_TO_SGI_AFFINITY(cluster_id, 1)     |
1154                MPIDR_TO_SGI_RS(cluster_id)              |
1155                tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
1156
1157         pr_devel("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
1158         gic_write_sgi1r(val);
1159 }
1160
1161 static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask)
1162 {
1163         int cpu;
1164
1165         if (WARN_ON(d->hwirq >= 16))
1166                 return;
1167
1168         /*
1169          * Ensure that stores to Normal memory are visible to the
1170          * other CPUs before issuing the IPI.
1171          */
1172         wmb();
1173
1174         for_each_cpu(cpu, mask) {
1175                 u64 cluster_id = MPIDR_TO_SGI_CLUSTER_ID(cpu_logical_map(cpu));
1176                 u16 tlist;
1177
1178                 tlist = gic_compute_target_list(&cpu, mask, cluster_id);
1179                 gic_send_sgi(cluster_id, tlist, d->hwirq);
1180         }
1181
1182         /* Force the above writes to ICC_SGI1R_EL1 to be executed */
1183         isb();
1184 }
1185
1186 static void __init gic_smp_init(void)
1187 {
1188         struct irq_fwspec sgi_fwspec = {
1189                 .fwnode         = gic_data.fwnode,
1190                 .param_count    = 1,
1191         };
1192         int base_sgi;
1193
1194         cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
1195                                   "irqchip/arm/gicv3:starting",
1196                                   gic_starting_cpu, NULL);
1197
1198         /* Register all 8 non-secure SGIs */
1199         base_sgi = __irq_domain_alloc_irqs(gic_data.domain, -1, 8,
1200                                            NUMA_NO_NODE, &sgi_fwspec,
1201                                            false, NULL);
1202         if (WARN_ON(base_sgi <= 0))
1203                 return;
1204
1205         set_smp_ipi_range(base_sgi, 8);
1206 }
1207
1208 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
1209                             bool force)
1210 {
1211         unsigned int cpu;
1212         u32 offset, index;
1213         void __iomem *reg;
1214         int enabled;
1215         u64 val;
1216
1217         if (force)
1218                 cpu = cpumask_first(mask_val);
1219         else
1220                 cpu = cpumask_any_and(mask_val, cpu_online_mask);
1221
1222         if (cpu >= nr_cpu_ids)
1223                 return -EINVAL;
1224
1225         if (gic_irq_in_rdist(d))
1226                 return -EINVAL;
1227
1228         /* If interrupt was enabled, disable it first */
1229         enabled = gic_peek_irq(d, GICD_ISENABLER);
1230         if (enabled)
1231                 gic_mask_irq(d);
1232
1233         offset = convert_offset_index(d, GICD_IROUTER, &index);
1234         reg = gic_dist_base(d) + offset + (index * 8);
1235         val = gic_mpidr_to_affinity(cpu_logical_map(cpu));
1236
1237         gic_write_irouter(val, reg);
1238
1239         /*
1240          * If the interrupt was enabled, enabled it again. Otherwise,
1241          * just wait for the distributor to have digested our changes.
1242          */
1243         if (enabled)
1244                 gic_unmask_irq(d);
1245         else
1246                 gic_dist_wait_for_rwp();
1247
1248         irq_data_update_effective_affinity(d, cpumask_of(cpu));
1249
1250         return IRQ_SET_MASK_OK_DONE;
1251 }
1252 #else
1253 #define gic_set_affinity        NULL
1254 #define gic_ipi_send_mask       NULL
1255 #define gic_smp_init()          do { } while(0)
1256 #endif
1257
1258 static int gic_retrigger(struct irq_data *data)
1259 {
1260         return !gic_irq_set_irqchip_state(data, IRQCHIP_STATE_PENDING, true);
1261 }
1262
1263 #ifdef CONFIG_CPU_PM
1264 static int gic_cpu_pm_notifier(struct notifier_block *self,
1265                                unsigned long cmd, void *v)
1266 {
1267         if (cmd == CPU_PM_EXIT) {
1268                 if (gic_dist_security_disabled())
1269                         gic_enable_redist(true);
1270                 gic_cpu_sys_reg_init();
1271         } else if (cmd == CPU_PM_ENTER && gic_dist_security_disabled()) {
1272                 gic_write_grpen1(0);
1273                 gic_enable_redist(false);
1274         }
1275         return NOTIFY_OK;
1276 }
1277
1278 static struct notifier_block gic_cpu_pm_notifier_block = {
1279         .notifier_call = gic_cpu_pm_notifier,
1280 };
1281
1282 static void gic_cpu_pm_init(void)
1283 {
1284         cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
1285 }
1286
1287 #else
1288 static inline void gic_cpu_pm_init(void) { }
1289 #endif /* CONFIG_CPU_PM */
1290
1291 static struct irq_chip gic_chip = {
1292         .name                   = "GICv3",
1293         .irq_mask               = gic_mask_irq,
1294         .irq_unmask             = gic_unmask_irq,
1295         .irq_eoi                = gic_eoi_irq,
1296         .irq_set_type           = gic_set_type,
1297         .irq_set_affinity       = gic_set_affinity,
1298         .irq_retrigger          = gic_retrigger,
1299         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
1300         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
1301         .irq_nmi_setup          = gic_irq_nmi_setup,
1302         .irq_nmi_teardown       = gic_irq_nmi_teardown,
1303         .ipi_send_mask          = gic_ipi_send_mask,
1304         .flags                  = IRQCHIP_SET_TYPE_MASKED |
1305                                   IRQCHIP_SKIP_SET_WAKE |
1306                                   IRQCHIP_MASK_ON_SUSPEND,
1307 };
1308
1309 static struct irq_chip gic_eoimode1_chip = {
1310         .name                   = "GICv3",
1311         .irq_mask               = gic_eoimode1_mask_irq,
1312         .irq_unmask             = gic_unmask_irq,
1313         .irq_eoi                = gic_eoimode1_eoi_irq,
1314         .irq_set_type           = gic_set_type,
1315         .irq_set_affinity       = gic_set_affinity,
1316         .irq_retrigger          = gic_retrigger,
1317         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
1318         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
1319         .irq_set_vcpu_affinity  = gic_irq_set_vcpu_affinity,
1320         .irq_nmi_setup          = gic_irq_nmi_setup,
1321         .irq_nmi_teardown       = gic_irq_nmi_teardown,
1322         .ipi_send_mask          = gic_ipi_send_mask,
1323         .flags                  = IRQCHIP_SET_TYPE_MASKED |
1324                                   IRQCHIP_SKIP_SET_WAKE |
1325                                   IRQCHIP_MASK_ON_SUSPEND,
1326 };
1327
1328 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
1329                               irq_hw_number_t hw)
1330 {
1331         struct irq_chip *chip = &gic_chip;
1332         struct irq_data *irqd = irq_desc_get_irq_data(irq_to_desc(irq));
1333
1334         if (static_branch_likely(&supports_deactivate_key))
1335                 chip = &gic_eoimode1_chip;
1336
1337         switch (__get_intid_range(hw)) {
1338         case SGI_RANGE:
1339         case PPI_RANGE:
1340         case EPPI_RANGE:
1341                 irq_set_percpu_devid(irq);
1342                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
1343                                     handle_percpu_devid_irq, NULL, NULL);
1344                 break;
1345
1346         case SPI_RANGE:
1347         case ESPI_RANGE:
1348                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
1349                                     handle_fasteoi_irq, NULL, NULL);
1350                 irq_set_probe(irq);
1351                 irqd_set_single_target(irqd);
1352                 break;
1353
1354         case LPI_RANGE:
1355                 if (!gic_dist_supports_lpis())
1356                         return -EPERM;
1357                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
1358                                     handle_fasteoi_irq, NULL, NULL);
1359                 break;
1360
1361         default:
1362                 return -EPERM;
1363         }
1364
1365         /* Prevents SW retriggers which mess up the ACK/EOI ordering */
1366         irqd_set_handle_enforce_irqctx(irqd);
1367         return 0;
1368 }
1369
1370 static int gic_irq_domain_translate(struct irq_domain *d,
1371                                     struct irq_fwspec *fwspec,
1372                                     unsigned long *hwirq,
1373                                     unsigned int *type)
1374 {
1375         if (fwspec->param_count == 1 && fwspec->param[0] < 16) {
1376                 *hwirq = fwspec->param[0];
1377                 *type = IRQ_TYPE_EDGE_RISING;
1378                 return 0;
1379         }
1380
1381         if (is_of_node(fwspec->fwnode)) {
1382                 if (fwspec->param_count < 3)
1383                         return -EINVAL;
1384
1385                 switch (fwspec->param[0]) {
1386                 case 0:                 /* SPI */
1387                         *hwirq = fwspec->param[1] + 32;
1388                         break;
1389                 case 1:                 /* PPI */
1390                         *hwirq = fwspec->param[1] + 16;
1391                         break;
1392                 case 2:                 /* ESPI */
1393                         *hwirq = fwspec->param[1] + ESPI_BASE_INTID;
1394                         break;
1395                 case 3:                 /* EPPI */
1396                         *hwirq = fwspec->param[1] + EPPI_BASE_INTID;
1397                         break;
1398                 case GIC_IRQ_TYPE_LPI:  /* LPI */
1399                         *hwirq = fwspec->param[1];
1400                         break;
1401                 case GIC_IRQ_TYPE_PARTITION:
1402                         *hwirq = fwspec->param[1];
1403                         if (fwspec->param[1] >= 16)
1404                                 *hwirq += EPPI_BASE_INTID - 16;
1405                         else
1406                                 *hwirq += 16;
1407                         break;
1408                 default:
1409                         return -EINVAL;
1410                 }
1411
1412                 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1413
1414                 /*
1415                  * Make it clear that broken DTs are... broken.
1416                  * Partitioned PPIs are an unfortunate exception.
1417                  */
1418                 WARN_ON(*type == IRQ_TYPE_NONE &&
1419                         fwspec->param[0] != GIC_IRQ_TYPE_PARTITION);
1420                 return 0;
1421         }
1422
1423         if (is_fwnode_irqchip(fwspec->fwnode)) {
1424                 if(fwspec->param_count != 2)
1425                         return -EINVAL;
1426
1427                 *hwirq = fwspec->param[0];
1428                 *type = fwspec->param[1];
1429
1430                 WARN_ON(*type == IRQ_TYPE_NONE);
1431                 return 0;
1432         }
1433
1434         return -EINVAL;
1435 }
1436
1437 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
1438                                 unsigned int nr_irqs, void *arg)
1439 {
1440         int i, ret;
1441         irq_hw_number_t hwirq;
1442         unsigned int type = IRQ_TYPE_NONE;
1443         struct irq_fwspec *fwspec = arg;
1444
1445         ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
1446         if (ret)
1447                 return ret;
1448
1449         for (i = 0; i < nr_irqs; i++) {
1450                 ret = gic_irq_domain_map(domain, virq + i, hwirq + i);
1451                 if (ret)
1452                         return ret;
1453         }
1454
1455         return 0;
1456 }
1457
1458 static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
1459                                 unsigned int nr_irqs)
1460 {
1461         int i;
1462
1463         for (i = 0; i < nr_irqs; i++) {
1464                 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
1465                 irq_set_handler(virq + i, NULL);
1466                 irq_domain_reset_irq_data(d);
1467         }
1468 }
1469
1470 static int gic_irq_domain_select(struct irq_domain *d,
1471                                  struct irq_fwspec *fwspec,
1472                                  enum irq_domain_bus_token bus_token)
1473 {
1474         /* Not for us */
1475         if (fwspec->fwnode != d->fwnode)
1476                 return 0;
1477
1478         /* If this is not DT, then we have a single domain */
1479         if (!is_of_node(fwspec->fwnode))
1480                 return 1;
1481
1482         /*
1483          * If this is a PPI and we have a 4th (non-null) parameter,
1484          * then we need to match the partition domain.
1485          */
1486         if (fwspec->param_count >= 4 &&
1487             fwspec->param[0] == 1 && fwspec->param[3] != 0 &&
1488             gic_data.ppi_descs)
1489                 return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]);
1490
1491         return d == gic_data.domain;
1492 }
1493
1494 static const struct irq_domain_ops gic_irq_domain_ops = {
1495         .translate = gic_irq_domain_translate,
1496         .alloc = gic_irq_domain_alloc,
1497         .free = gic_irq_domain_free,
1498         .select = gic_irq_domain_select,
1499 };
1500
1501 static int partition_domain_translate(struct irq_domain *d,
1502                                       struct irq_fwspec *fwspec,
1503                                       unsigned long *hwirq,
1504                                       unsigned int *type)
1505 {
1506         struct device_node *np;
1507         int ret;
1508
1509         if (!gic_data.ppi_descs)
1510                 return -ENOMEM;
1511
1512         np = of_find_node_by_phandle(fwspec->param[3]);
1513         if (WARN_ON(!np))
1514                 return -EINVAL;
1515
1516         ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]],
1517                                      of_node_to_fwnode(np));
1518         if (ret < 0)
1519                 return ret;
1520
1521         *hwirq = ret;
1522         *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1523
1524         return 0;
1525 }
1526
1527 static const struct irq_domain_ops partition_domain_ops = {
1528         .translate = partition_domain_translate,
1529         .select = gic_irq_domain_select,
1530 };
1531
1532 static bool gic_enable_quirk_msm8996(void *data)
1533 {
1534         struct gic_chip_data *d = data;
1535
1536         d->flags |= FLAGS_WORKAROUND_GICR_WAKER_MSM8996;
1537
1538         return true;
1539 }
1540
1541 static bool gic_enable_quirk_cavium_38539(void *data)
1542 {
1543         struct gic_chip_data *d = data;
1544
1545         d->flags |= FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539;
1546
1547         return true;
1548 }
1549
1550 static bool gic_enable_quirk_hip06_07(void *data)
1551 {
1552         struct gic_chip_data *d = data;
1553
1554         /*
1555          * HIP06 GICD_IIDR clashes with GIC-600 product number (despite
1556          * not being an actual ARM implementation). The saving grace is
1557          * that GIC-600 doesn't have ESPI, so nothing to do in that case.
1558          * HIP07 doesn't even have a proper IIDR, and still pretends to
1559          * have ESPI. In both cases, put them right.
1560          */
1561         if (d->rdists.gicd_typer & GICD_TYPER_ESPI) {
1562                 /* Zero both ESPI and the RES0 field next to it... */
1563                 d->rdists.gicd_typer &= ~GENMASK(9, 8);
1564                 return true;
1565         }
1566
1567         return false;
1568 }
1569
1570 static const struct gic_quirk gic_quirks[] = {
1571         {
1572                 .desc   = "GICv3: Qualcomm MSM8996 broken firmware",
1573                 .compatible = "qcom,msm8996-gic-v3",
1574                 .init   = gic_enable_quirk_msm8996,
1575         },
1576         {
1577                 .desc   = "GICv3: HIP06 erratum 161010803",
1578                 .iidr   = 0x0204043b,
1579                 .mask   = 0xffffffff,
1580                 .init   = gic_enable_quirk_hip06_07,
1581         },
1582         {
1583                 .desc   = "GICv3: HIP07 erratum 161010803",
1584                 .iidr   = 0x00000000,
1585                 .mask   = 0xffffffff,
1586                 .init   = gic_enable_quirk_hip06_07,
1587         },
1588         {
1589                 /*
1590                  * Reserved register accesses generate a Synchronous
1591                  * External Abort. This erratum applies to:
1592                  * - ThunderX: CN88xx
1593                  * - OCTEON TX: CN83xx, CN81xx
1594                  * - OCTEON TX2: CN93xx, CN96xx, CN98xx, CNF95xx*
1595                  */
1596                 .desc   = "GICv3: Cavium erratum 38539",
1597                 .iidr   = 0xa000034c,
1598                 .mask   = 0xe8f00fff,
1599                 .init   = gic_enable_quirk_cavium_38539,
1600         },
1601         {
1602         }
1603 };
1604
1605 static void gic_enable_nmi_support(void)
1606 {
1607         int i;
1608
1609         if (!gic_prio_masking_enabled())
1610                 return;
1611
1612         ppi_nmi_refs = kcalloc(gic_data.ppi_nr, sizeof(*ppi_nmi_refs), GFP_KERNEL);
1613         if (!ppi_nmi_refs)
1614                 return;
1615
1616         for (i = 0; i < gic_data.ppi_nr; i++)
1617                 refcount_set(&ppi_nmi_refs[i], 0);
1618
1619         /*
1620          * Linux itself doesn't use 1:N distribution, so has no need to
1621          * set PMHE. The only reason to have it set is if EL3 requires it
1622          * (and we can't change it).
1623          */
1624         if (gic_read_ctlr() & ICC_CTLR_EL1_PMHE_MASK)
1625                 static_branch_enable(&gic_pmr_sync);
1626
1627         pr_info("Pseudo-NMIs enabled using %s ICC_PMR_EL1 synchronisation\n",
1628                 static_branch_unlikely(&gic_pmr_sync) ? "forced" : "relaxed");
1629
1630         /*
1631          * How priority values are used by the GIC depends on two things:
1632          * the security state of the GIC (controlled by the GICD_CTRL.DS bit)
1633          * and if Group 0 interrupts can be delivered to Linux in the non-secure
1634          * world as FIQs (controlled by the SCR_EL3.FIQ bit). These affect the
1635          * the ICC_PMR_EL1 register and the priority that software assigns to
1636          * interrupts:
1637          *
1638          * GICD_CTRL.DS | SCR_EL3.FIQ | ICC_PMR_EL1 | Group 1 priority
1639          * -----------------------------------------------------------
1640          *      1       |      -      |  unchanged  |    unchanged
1641          * -----------------------------------------------------------
1642          *      0       |      1      |  non-secure |    non-secure
1643          * -----------------------------------------------------------
1644          *      0       |      0      |  unchanged  |    non-secure
1645          *
1646          * where non-secure means that the value is right-shifted by one and the
1647          * MSB bit set, to make it fit in the non-secure priority range.
1648          *
1649          * In the first two cases, where ICC_PMR_EL1 and the interrupt priority
1650          * are both either modified or unchanged, we can use the same set of
1651          * priorities.
1652          *
1653          * In the last case, where only the interrupt priorities are modified to
1654          * be in the non-secure range, we use a different PMR value to mask IRQs
1655          * and the rest of the values that we use remain unchanged.
1656          */
1657         if (gic_has_group0() && !gic_dist_security_disabled())
1658                 static_branch_enable(&gic_nonsecure_priorities);
1659
1660         static_branch_enable(&supports_pseudo_nmis);
1661
1662         if (static_branch_likely(&supports_deactivate_key))
1663                 gic_eoimode1_chip.flags |= IRQCHIP_SUPPORTS_NMI;
1664         else
1665                 gic_chip.flags |= IRQCHIP_SUPPORTS_NMI;
1666 }
1667
1668 static int __init gic_init_bases(void __iomem *dist_base,
1669                                  struct redist_region *rdist_regs,
1670                                  u32 nr_redist_regions,
1671                                  u64 redist_stride,
1672                                  struct fwnode_handle *handle)
1673 {
1674         u32 typer;
1675         int err;
1676
1677         if (!is_hyp_mode_available())
1678                 static_branch_disable(&supports_deactivate_key);
1679
1680         if (static_branch_likely(&supports_deactivate_key))
1681                 pr_info("GIC: Using split EOI/Deactivate mode\n");
1682
1683         gic_data.fwnode = handle;
1684         gic_data.dist_base = dist_base;
1685         gic_data.redist_regions = rdist_regs;
1686         gic_data.nr_redist_regions = nr_redist_regions;
1687         gic_data.redist_stride = redist_stride;
1688
1689         /*
1690          * Find out how many interrupts are supported.
1691          */
1692         typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
1693         gic_data.rdists.gicd_typer = typer;
1694
1695         gic_enable_quirks(readl_relaxed(gic_data.dist_base + GICD_IIDR),
1696                           gic_quirks, &gic_data);
1697
1698         pr_info("%d SPIs implemented\n", GIC_LINE_NR - 32);
1699         pr_info("%d Extended SPIs implemented\n", GIC_ESPI_NR);
1700
1701         /*
1702          * ThunderX1 explodes on reading GICD_TYPER2, in violation of the
1703          * architecture spec (which says that reserved registers are RES0).
1704          */
1705         if (!(gic_data.flags & FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539))
1706                 gic_data.rdists.gicd_typer2 = readl_relaxed(gic_data.dist_base + GICD_TYPER2);
1707
1708         gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
1709                                                  &gic_data);
1710         gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
1711         gic_data.rdists.has_rvpeid = true;
1712         gic_data.rdists.has_vlpis = true;
1713         gic_data.rdists.has_direct_lpi = true;
1714         gic_data.rdists.has_vpend_valid_dirty = true;
1715
1716         if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
1717                 err = -ENOMEM;
1718                 goto out_free;
1719         }
1720
1721         irq_domain_update_bus_token(gic_data.domain, DOMAIN_BUS_WIRED);
1722
1723         gic_data.has_rss = !!(typer & GICD_TYPER_RSS);
1724         pr_info("Distributor has %sRange Selector support\n",
1725                 gic_data.has_rss ? "" : "no ");
1726
1727         if (typer & GICD_TYPER_MBIS) {
1728                 err = mbi_init(handle, gic_data.domain);
1729                 if (err)
1730                         pr_err("Failed to initialize MBIs\n");
1731         }
1732
1733         set_handle_irq(gic_handle_irq);
1734
1735         gic_update_rdist_properties();
1736
1737         gic_dist_init();
1738         gic_cpu_init();
1739         gic_smp_init();
1740         gic_cpu_pm_init();
1741
1742         if (gic_dist_supports_lpis()) {
1743                 its_init(handle, &gic_data.rdists, gic_data.domain);
1744                 its_cpu_init();
1745         } else {
1746                 if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1747                         gicv2m_init(handle, gic_data.domain);
1748         }
1749
1750         gic_enable_nmi_support();
1751
1752         return 0;
1753
1754 out_free:
1755         if (gic_data.domain)
1756                 irq_domain_remove(gic_data.domain);
1757         free_percpu(gic_data.rdists.rdist);
1758         return err;
1759 }
1760
1761 static int __init gic_validate_dist_version(void __iomem *dist_base)
1762 {
1763         u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1764
1765         if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4)
1766                 return -ENODEV;
1767
1768         return 0;
1769 }
1770
1771 /* Create all possible partitions at boot time */
1772 static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
1773 {
1774         struct device_node *parts_node, *child_part;
1775         int part_idx = 0, i;
1776         int nr_parts;
1777         struct partition_affinity *parts;
1778
1779         parts_node = of_get_child_by_name(gic_node, "ppi-partitions");
1780         if (!parts_node)
1781                 return;
1782
1783         gic_data.ppi_descs = kcalloc(gic_data.ppi_nr, sizeof(*gic_data.ppi_descs), GFP_KERNEL);
1784         if (!gic_data.ppi_descs)
1785                 return;
1786
1787         nr_parts = of_get_child_count(parts_node);
1788
1789         if (!nr_parts)
1790                 goto out_put_node;
1791
1792         parts = kcalloc(nr_parts, sizeof(*parts), GFP_KERNEL);
1793         if (WARN_ON(!parts))
1794                 goto out_put_node;
1795
1796         for_each_child_of_node(parts_node, child_part) {
1797                 struct partition_affinity *part;
1798                 int n;
1799
1800                 part = &parts[part_idx];
1801
1802                 part->partition_id = of_node_to_fwnode(child_part);
1803
1804                 pr_info("GIC: PPI partition %pOFn[%d] { ",
1805                         child_part, part_idx);
1806
1807                 n = of_property_count_elems_of_size(child_part, "affinity",
1808                                                     sizeof(u32));
1809                 WARN_ON(n <= 0);
1810
1811                 for (i = 0; i < n; i++) {
1812                         int err, cpu;
1813                         u32 cpu_phandle;
1814                         struct device_node *cpu_node;
1815
1816                         err = of_property_read_u32_index(child_part, "affinity",
1817                                                          i, &cpu_phandle);
1818                         if (WARN_ON(err))
1819                                 continue;
1820
1821                         cpu_node = of_find_node_by_phandle(cpu_phandle);
1822                         if (WARN_ON(!cpu_node))
1823                                 continue;
1824
1825                         cpu = of_cpu_node_to_id(cpu_node);
1826                         if (WARN_ON(cpu < 0))
1827                                 continue;
1828
1829                         pr_cont("%pOF[%d] ", cpu_node, cpu);
1830
1831                         cpumask_set_cpu(cpu, &part->mask);
1832                 }
1833
1834                 pr_cont("}\n");
1835                 part_idx++;
1836         }
1837
1838         for (i = 0; i < gic_data.ppi_nr; i++) {
1839                 unsigned int irq;
1840                 struct partition_desc *desc;
1841                 struct irq_fwspec ppi_fwspec = {
1842                         .fwnode         = gic_data.fwnode,
1843                         .param_count    = 3,
1844                         .param          = {
1845                                 [0]     = GIC_IRQ_TYPE_PARTITION,
1846                                 [1]     = i,
1847                                 [2]     = IRQ_TYPE_NONE,
1848                         },
1849                 };
1850
1851                 irq = irq_create_fwspec_mapping(&ppi_fwspec);
1852                 if (WARN_ON(!irq))
1853                         continue;
1854                 desc = partition_create_desc(gic_data.fwnode, parts, nr_parts,
1855                                              irq, &partition_domain_ops);
1856                 if (WARN_ON(!desc))
1857                         continue;
1858
1859                 gic_data.ppi_descs[i] = desc;
1860         }
1861
1862 out_put_node:
1863         of_node_put(parts_node);
1864 }
1865
1866 static void __init gic_of_setup_kvm_info(struct device_node *node)
1867 {
1868         int ret;
1869         struct resource r;
1870         u32 gicv_idx;
1871
1872         gic_v3_kvm_info.type = GIC_V3;
1873
1874         gic_v3_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1875         if (!gic_v3_kvm_info.maint_irq)
1876                 return;
1877
1878         if (of_property_read_u32(node, "#redistributor-regions",
1879                                  &gicv_idx))
1880                 gicv_idx = 1;
1881
1882         gicv_idx += 3;  /* Also skip GICD, GICC, GICH */
1883         ret = of_address_to_resource(node, gicv_idx, &r);
1884         if (!ret)
1885                 gic_v3_kvm_info.vcpu = r;
1886
1887         gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
1888         gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;
1889         gic_set_kvm_info(&gic_v3_kvm_info);
1890 }
1891
1892 static int __init gic_of_init(struct device_node *node, struct device_node *parent)
1893 {
1894         void __iomem *dist_base;
1895         struct redist_region *rdist_regs;
1896         u64 redist_stride;
1897         u32 nr_redist_regions;
1898         int err, i;
1899
1900         dist_base = of_iomap(node, 0);
1901         if (!dist_base) {
1902                 pr_err("%pOF: unable to map gic dist registers\n", node);
1903                 return -ENXIO;
1904         }
1905
1906         err = gic_validate_dist_version(dist_base);
1907         if (err) {
1908                 pr_err("%pOF: no distributor detected, giving up\n", node);
1909                 goto out_unmap_dist;
1910         }
1911
1912         if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
1913                 nr_redist_regions = 1;
1914
1915         rdist_regs = kcalloc(nr_redist_regions, sizeof(*rdist_regs),
1916                              GFP_KERNEL);
1917         if (!rdist_regs) {
1918                 err = -ENOMEM;
1919                 goto out_unmap_dist;
1920         }
1921
1922         for (i = 0; i < nr_redist_regions; i++) {
1923                 struct resource res;
1924                 int ret;
1925
1926                 ret = of_address_to_resource(node, 1 + i, &res);
1927                 rdist_regs[i].redist_base = of_iomap(node, 1 + i);
1928                 if (ret || !rdist_regs[i].redist_base) {
1929                         pr_err("%pOF: couldn't map region %d\n", node, i);
1930                         err = -ENODEV;
1931                         goto out_unmap_rdist;
1932                 }
1933                 rdist_regs[i].phys_base = res.start;
1934         }
1935
1936         if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
1937                 redist_stride = 0;
1938
1939         gic_enable_of_quirks(node, gic_quirks, &gic_data);
1940
1941         err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions,
1942                              redist_stride, &node->fwnode);
1943         if (err)
1944                 goto out_unmap_rdist;
1945
1946         gic_populate_ppi_partitions(node);
1947
1948         if (static_branch_likely(&supports_deactivate_key))
1949                 gic_of_setup_kvm_info(node);
1950         return 0;
1951
1952 out_unmap_rdist:
1953         for (i = 0; i < nr_redist_regions; i++)
1954                 if (rdist_regs[i].redist_base)
1955                         iounmap(rdist_regs[i].redist_base);
1956         kfree(rdist_regs);
1957 out_unmap_dist:
1958         iounmap(dist_base);
1959         return err;
1960 }
1961
1962 IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);
1963
1964 #ifdef CONFIG_ACPI
1965 static struct
1966 {
1967         void __iomem *dist_base;
1968         struct redist_region *redist_regs;
1969         u32 nr_redist_regions;
1970         bool single_redist;
1971         int enabled_rdists;
1972         u32 maint_irq;
1973         int maint_irq_mode;
1974         phys_addr_t vcpu_base;
1975 } acpi_data __initdata;
1976
1977 static void __init
1978 gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base)
1979 {
1980         static int count = 0;
1981
1982         acpi_data.redist_regs[count].phys_base = phys_base;
1983         acpi_data.redist_regs[count].redist_base = redist_base;
1984         acpi_data.redist_regs[count].single_redist = acpi_data.single_redist;
1985         count++;
1986 }
1987
1988 static int __init
1989 gic_acpi_parse_madt_redist(union acpi_subtable_headers *header,
1990                            const unsigned long end)
1991 {
1992         struct acpi_madt_generic_redistributor *redist =
1993                         (struct acpi_madt_generic_redistributor *)header;
1994         void __iomem *redist_base;
1995
1996         redist_base = ioremap(redist->base_address, redist->length);
1997         if (!redist_base) {
1998                 pr_err("Couldn't map GICR region @%llx\n", redist->base_address);
1999                 return -ENOMEM;
2000         }
2001
2002         gic_acpi_register_redist(redist->base_address, redist_base);
2003         return 0;
2004 }
2005
2006 static int __init
2007 gic_acpi_parse_madt_gicc(union acpi_subtable_headers *header,
2008                          const unsigned long end)
2009 {
2010         struct acpi_madt_generic_interrupt *gicc =
2011                                 (struct acpi_madt_generic_interrupt *)header;
2012         u32 reg = readl_relaxed(acpi_data.dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
2013         u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2;
2014         void __iomem *redist_base;
2015
2016         /* GICC entry which has !ACPI_MADT_ENABLED is not unusable so skip */
2017         if (!(gicc->flags & ACPI_MADT_ENABLED))
2018                 return 0;
2019
2020         redist_base = ioremap(gicc->gicr_base_address, size);
2021         if (!redist_base)
2022                 return -ENOMEM;
2023
2024         gic_acpi_register_redist(gicc->gicr_base_address, redist_base);
2025         return 0;
2026 }
2027
2028 static int __init gic_acpi_collect_gicr_base(void)
2029 {
2030         acpi_tbl_entry_handler redist_parser;
2031         enum acpi_madt_type type;
2032
2033         if (acpi_data.single_redist) {
2034                 type = ACPI_MADT_TYPE_GENERIC_INTERRUPT;
2035                 redist_parser = gic_acpi_parse_madt_gicc;
2036         } else {
2037                 type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR;
2038                 redist_parser = gic_acpi_parse_madt_redist;
2039         }
2040
2041         /* Collect redistributor base addresses in GICR entries */
2042         if (acpi_table_parse_madt(type, redist_parser, 0) > 0)
2043                 return 0;
2044
2045         pr_info("No valid GICR entries exist\n");
2046         return -ENODEV;
2047 }
2048
2049 static int __init gic_acpi_match_gicr(union acpi_subtable_headers *header,
2050                                   const unsigned long end)
2051 {
2052         /* Subtable presence means that redist exists, that's it */
2053         return 0;
2054 }
2055
2056 static int __init gic_acpi_match_gicc(union acpi_subtable_headers *header,
2057                                       const unsigned long end)
2058 {
2059         struct acpi_madt_generic_interrupt *gicc =
2060                                 (struct acpi_madt_generic_interrupt *)header;
2061
2062         /*
2063          * If GICC is enabled and has valid gicr base address, then it means
2064          * GICR base is presented via GICC
2065          */
2066         if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) {
2067                 acpi_data.enabled_rdists++;
2068                 return 0;
2069         }
2070
2071         /*
2072          * It's perfectly valid firmware can pass disabled GICC entry, driver
2073          * should not treat as errors, skip the entry instead of probe fail.
2074          */
2075         if (!(gicc->flags & ACPI_MADT_ENABLED))
2076                 return 0;
2077
2078         return -ENODEV;
2079 }
2080
2081 static int __init gic_acpi_count_gicr_regions(void)
2082 {
2083         int count;
2084
2085         /*
2086          * Count how many redistributor regions we have. It is not allowed
2087          * to mix redistributor description, GICR and GICC subtables have to be
2088          * mutually exclusive.
2089          */
2090         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
2091                                       gic_acpi_match_gicr, 0);
2092         if (count > 0) {
2093                 acpi_data.single_redist = false;
2094                 return count;
2095         }
2096
2097         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
2098                                       gic_acpi_match_gicc, 0);
2099         if (count > 0) {
2100                 acpi_data.single_redist = true;
2101                 count = acpi_data.enabled_rdists;
2102         }
2103
2104         return count;
2105 }
2106
2107 static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header,
2108                                            struct acpi_probe_entry *ape)
2109 {
2110         struct acpi_madt_generic_distributor *dist;
2111         int count;
2112
2113         dist = (struct acpi_madt_generic_distributor *)header;
2114         if (dist->version != ape->driver_data)
2115                 return false;
2116
2117         /* We need to do that exercise anyway, the sooner the better */
2118         count = gic_acpi_count_gicr_regions();
2119         if (count <= 0)
2120                 return false;
2121
2122         acpi_data.nr_redist_regions = count;
2123         return true;
2124 }
2125
2126 static int __init gic_acpi_parse_virt_madt_gicc(union acpi_subtable_headers *header,
2127                                                 const unsigned long end)
2128 {
2129         struct acpi_madt_generic_interrupt *gicc =
2130                 (struct acpi_madt_generic_interrupt *)header;
2131         int maint_irq_mode;
2132         static int first_madt = true;
2133
2134         /* Skip unusable CPUs */
2135         if (!(gicc->flags & ACPI_MADT_ENABLED))
2136                 return 0;
2137
2138         maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
2139                 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
2140
2141         if (first_madt) {
2142                 first_madt = false;
2143
2144                 acpi_data.maint_irq = gicc->vgic_interrupt;
2145                 acpi_data.maint_irq_mode = maint_irq_mode;
2146                 acpi_data.vcpu_base = gicc->gicv_base_address;
2147
2148                 return 0;
2149         }
2150
2151         /*
2152          * The maintenance interrupt and GICV should be the same for every CPU
2153          */
2154         if ((acpi_data.maint_irq != gicc->vgic_interrupt) ||
2155             (acpi_data.maint_irq_mode != maint_irq_mode) ||
2156             (acpi_data.vcpu_base != gicc->gicv_base_address))
2157                 return -EINVAL;
2158
2159         return 0;
2160 }
2161
2162 static bool __init gic_acpi_collect_virt_info(void)
2163 {
2164         int count;
2165
2166         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
2167                                       gic_acpi_parse_virt_madt_gicc, 0);
2168
2169         return (count > 0);
2170 }
2171
2172 #define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K)
2173 #define ACPI_GICV2_VCTRL_MEM_SIZE       (SZ_4K)
2174 #define ACPI_GICV2_VCPU_MEM_SIZE        (SZ_8K)
2175
2176 static void __init gic_acpi_setup_kvm_info(void)
2177 {
2178         int irq;
2179
2180         if (!gic_acpi_collect_virt_info()) {
2181                 pr_warn("Unable to get hardware information used for virtualization\n");
2182                 return;
2183         }
2184
2185         gic_v3_kvm_info.type = GIC_V3;
2186
2187         irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
2188                                 acpi_data.maint_irq_mode,
2189                                 ACPI_ACTIVE_HIGH);
2190         if (irq <= 0)
2191                 return;
2192
2193         gic_v3_kvm_info.maint_irq = irq;
2194
2195         if (acpi_data.vcpu_base) {
2196                 struct resource *vcpu = &gic_v3_kvm_info.vcpu;
2197
2198                 vcpu->flags = IORESOURCE_MEM;
2199                 vcpu->start = acpi_data.vcpu_base;
2200                 vcpu->end = vcpu->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
2201         }
2202
2203         gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
2204         gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;
2205         gic_set_kvm_info(&gic_v3_kvm_info);
2206 }
2207
2208 static int __init
2209 gic_acpi_init(union acpi_subtable_headers *header, const unsigned long end)
2210 {
2211         struct acpi_madt_generic_distributor *dist;
2212         struct fwnode_handle *domain_handle;
2213         size_t size;
2214         int i, err;
2215
2216         /* Get distributor base address */
2217         dist = (struct acpi_madt_generic_distributor *)header;
2218         acpi_data.dist_base = ioremap(dist->base_address,
2219                                       ACPI_GICV3_DIST_MEM_SIZE);
2220         if (!acpi_data.dist_base) {
2221                 pr_err("Unable to map GICD registers\n");
2222                 return -ENOMEM;
2223         }
2224
2225         err = gic_validate_dist_version(acpi_data.dist_base);
2226         if (err) {
2227                 pr_err("No distributor detected at @%p, giving up\n",
2228                        acpi_data.dist_base);
2229                 goto out_dist_unmap;
2230         }
2231
2232         size = sizeof(*acpi_data.redist_regs) * acpi_data.nr_redist_regions;
2233         acpi_data.redist_regs = kzalloc(size, GFP_KERNEL);
2234         if (!acpi_data.redist_regs) {
2235                 err = -ENOMEM;
2236                 goto out_dist_unmap;
2237         }
2238
2239         err = gic_acpi_collect_gicr_base();
2240         if (err)
2241                 goto out_redist_unmap;
2242
2243         domain_handle = irq_domain_alloc_fwnode(&dist->base_address);
2244         if (!domain_handle) {
2245                 err = -ENOMEM;
2246                 goto out_redist_unmap;
2247         }
2248
2249         err = gic_init_bases(acpi_data.dist_base, acpi_data.redist_regs,
2250                              acpi_data.nr_redist_regions, 0, domain_handle);
2251         if (err)
2252                 goto out_fwhandle_free;
2253
2254         acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
2255
2256         if (static_branch_likely(&supports_deactivate_key))
2257                 gic_acpi_setup_kvm_info();
2258
2259         return 0;
2260
2261 out_fwhandle_free:
2262         irq_domain_free_fwnode(domain_handle);
2263 out_redist_unmap:
2264         for (i = 0; i < acpi_data.nr_redist_regions; i++)
2265                 if (acpi_data.redist_regs[i].redist_base)
2266                         iounmap(acpi_data.redist_regs[i].redist_base);
2267         kfree(acpi_data.redist_regs);
2268 out_dist_unmap:
2269         iounmap(acpi_data.dist_base);
2270         return err;
2271 }
2272 IRQCHIP_ACPI_DECLARE(gic_v3, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
2273                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V3,
2274                      gic_acpi_init);
2275 IRQCHIP_ACPI_DECLARE(gic_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
2276                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V4,
2277                      gic_acpi_init);
2278 IRQCHIP_ACPI_DECLARE(gic_v3_or_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
2279                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_NONE,
2280                      gic_acpi_init);
2281 #endif