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