drivers/irqchip/irq-gic-v3.c

   1 /*
   2  * Copyright (C) 2013, 2014 ARM Limited, All Rights Reserved.
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #define pr_fmt(fmt)     "GICv3: " fmt
  19
  20 #include <linux/acpi.h>
  21 #include <linux/cpu.h>
  22 #include <linux/cpu_pm.h>
  23 #include <linux/delay.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irqdomain.h>
  26 #include <linux/of.h>
  27 #include <linux/of_address.h>
  28 #include <linux/of_irq.h>
  29 #include <linux/percpu.h>
  30 #include <linux/slab.h>
  31
  32 #include <linux/irqchip.h>
  33 #include <linux/irqchip/arm-gic-common.h>
  34 #include <linux/irqchip/arm-gic-v3.h>
  35 #include <linux/irqchip/irq-partition-percpu.h>
  36
  37 #include <asm/cputype.h>
  38 #include <asm/exception.h>
  39 #include <asm/smp_plat.h>
  40 #include <asm/virt.h>
  41
  42 #include "irq-gic-common.h"
  43
  44 struct redist_region {
  45         void __iomem            *redist_base;
  46         phys_addr_t             phys_base;
  47         bool                    single_redist;
  48 };
  49
  50 struct gic_chip_data {
  51         struct fwnode_handle    *fwnode;
  52         void __iomem            *dist_base;
  53         struct redist_region    *redist_regions;
  54         struct rdists           rdists;
  55         struct irq_domain       *domain;
  56         u64                     redist_stride;
  57         u32                     nr_redist_regions;
  58         unsigned int            irq_nr;
  59         struct partition_desc   *ppi_descs[16];
  60 };
  61
  62 static struct gic_chip_data gic_data __read_mostly;
  63 static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
  64
  65 static struct gic_kvm_info gic_v3_kvm_info;
  66
  67 #define gic_data_rdist()                (this_cpu_ptr(gic_data.rdists.rdist))
  68 #define gic_data_rdist_rd_base()        (gic_data_rdist()->rd_base)
  69 #define gic_data_rdist_sgi_base()       (gic_data_rdist_rd_base() + SZ_64K)
  70
  71 /* Our default, arbitrary priority value. Linux only uses one anyway. */
  72 #define DEFAULT_PMR_VALUE       0xf0
  73
  74 static inline unsigned int gic_irq(struct irq_data *d)
  75 {
  76         return d->hwirq;
  77 }
  78
  79 static inline int gic_irq_in_rdist(struct irq_data *d)
  80 {
  81         return gic_irq(d) < 32;
  82 }
  83
  84 static inline void __iomem *gic_dist_base(struct irq_data *d)
  85 {
  86         if (gic_irq_in_rdist(d))        /* SGI+PPI -> SGI_base for this CPU */
  87                 return gic_data_rdist_sgi_base();
  88
  89         if (d->hwirq <= 1023)           /* SPI -> dist_base */
  90                 return gic_data.dist_base;
  91
  92         return NULL;
  93 }
  94
  95 static void gic_do_wait_for_rwp(void __iomem *base)
  96 {
  97         u32 count = 1000000;    /* 1s! */
  98
  99         while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) {
 100                 count--;
 101                 if (!count) {
 102                         pr_err_ratelimited("RWP timeout, gone fishing\n");
 103                         return;
 104                 }
 105                 cpu_relax();
 106                 udelay(1);
 107         };
 108 }
 109
 110 /* Wait for completion of a distributor change */
 111 static void gic_dist_wait_for_rwp(void)
 112 {
 113         gic_do_wait_for_rwp(gic_data.dist_base);
 114 }
 115
 116 /* Wait for completion of a redistributor change */
 117 static void gic_redist_wait_for_rwp(void)
 118 {
 119         gic_do_wait_for_rwp(gic_data_rdist_rd_base());
 120 }
 121
 122 #ifdef CONFIG_ARM64
 123 static DEFINE_STATIC_KEY_FALSE(is_cavium_thunderx);
 124
 125 static u64 __maybe_unused gic_read_iar(void)
 126 {
 127         if (static_branch_unlikely(&is_cavium_thunderx))
 128                 return gic_read_iar_cavium_thunderx();
 129         else
 130                 return gic_read_iar_common();
 131 }
 132 #endif
 133
 134 static void gic_enable_redist(bool enable)
 135 {
 136         void __iomem *rbase;
 137         u32 count = 1000000;    /* 1s! */
 138         u32 val;
 139
 140         rbase = gic_data_rdist_rd_base();
 141
 142         val = readl_relaxed(rbase + GICR_WAKER);
 143         if (enable)
 144                 /* Wake up this CPU redistributor */
 145                 val &= ~GICR_WAKER_ProcessorSleep;
 146         else
 147                 val |= GICR_WAKER_ProcessorSleep;
 148         writel_relaxed(val, rbase + GICR_WAKER);
 149
 150         if (!enable) {          /* Check that GICR_WAKER is writeable */
 151                 val = readl_relaxed(rbase + GICR_WAKER);
 152                 if (!(val & GICR_WAKER_ProcessorSleep))
 153                         return; /* No PM support in this redistributor */
 154         }
 155
 156         while (count--) {
 157                 val = readl_relaxed(rbase + GICR_WAKER);
 158                 if (enable ^ (bool)(val & GICR_WAKER_ChildrenAsleep))
 159                         break;
 160                 cpu_relax();
 161                 udelay(1);
 162         };
 163         if (!count)
 164                 pr_err_ratelimited("redistributor failed to %s...\n",
 165                                    enable ? "wakeup" : "sleep");
 166 }
 167
 168 /*
 169  * Routines to disable, enable, EOI and route interrupts
 170  */
 171 static int gic_peek_irq(struct irq_data *d, u32 offset)
 172 {
 173         u32 mask = 1 << (gic_irq(d) % 32);
 174         void __iomem *base;
 175
 176         if (gic_irq_in_rdist(d))
 177                 base = gic_data_rdist_sgi_base();
 178         else
 179                 base = gic_data.dist_base;
 180
 181         return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask);
 182 }
 183
 184 static void gic_poke_irq(struct irq_data *d, u32 offset)
 185 {
 186         u32 mask = 1 << (gic_irq(d) % 32);
 187         void (*rwp_wait)(void);
 188         void __iomem *base;
 189
 190         if (gic_irq_in_rdist(d)) {
 191                 base = gic_data_rdist_sgi_base();
 192                 rwp_wait = gic_redist_wait_for_rwp;
 193         } else {
 194                 base = gic_data.dist_base;
 195                 rwp_wait = gic_dist_wait_for_rwp;
 196         }
 197
 198         writel_relaxed(mask, base + offset + (gic_irq(d) / 32) * 4);
 199         rwp_wait();
 200 }
 201
 202 static void gic_mask_irq(struct irq_data *d)
 203 {
 204         gic_poke_irq(d, GICD_ICENABLER);
 205 }
 206
 207 static void gic_eoimode1_mask_irq(struct irq_data *d)
 208 {
 209         gic_mask_irq(d);
 210         /*
 211          * When masking a forwarded interrupt, make sure it is
 212          * deactivated as well.
 213          *
 214          * This ensures that an interrupt that is getting
 215          * disabled/masked will not get "stuck", because there is
 216          * noone to deactivate it (guest is being terminated).
 217          */
 218         if (irqd_is_forwarded_to_vcpu(d))
 219                 gic_poke_irq(d, GICD_ICACTIVER);
 220 }
 221
 222 static void gic_unmask_irq(struct irq_data *d)
 223 {
 224         gic_poke_irq(d, GICD_ISENABLER);
 225 }
 226
 227 static int gic_irq_set_irqchip_state(struct irq_data *d,
 228                                      enum irqchip_irq_state which, bool val)
 229 {
 230         u32 reg;
 231
 232         if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
 233                 return -EINVAL;
 234
 235         switch (which) {
 236         case IRQCHIP_STATE_PENDING:
 237                 reg = val ? GICD_ISPENDR : GICD_ICPENDR;
 238                 break;
 239
 240         case IRQCHIP_STATE_ACTIVE:
 241                 reg = val ? GICD_ISACTIVER : GICD_ICACTIVER;
 242                 break;
 243
 244         case IRQCHIP_STATE_MASKED:
 245                 reg = val ? GICD_ICENABLER : GICD_ISENABLER;
 246                 break;
 247
 248         default:
 249                 return -EINVAL;
 250         }
 251
 252         gic_poke_irq(d, reg);
 253         return 0;
 254 }
 255
 256 static int gic_irq_get_irqchip_state(struct irq_data *d,
 257                                      enum irqchip_irq_state which, bool *val)
 258 {
 259         if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
 260                 return -EINVAL;
 261
 262         switch (which) {
 263         case IRQCHIP_STATE_PENDING:
 264                 *val = gic_peek_irq(d, GICD_ISPENDR);
 265                 break;
 266
 267         case IRQCHIP_STATE_ACTIVE:
 268                 *val = gic_peek_irq(d, GICD_ISACTIVER);
 269                 break;
 270
 271         case IRQCHIP_STATE_MASKED:
 272                 *val = !gic_peek_irq(d, GICD_ISENABLER);
 273                 break;
 274
 275         default:
 276                 return -EINVAL;
 277         }
 278
 279         return 0;
 280 }
 281
 282 static void gic_eoi_irq(struct irq_data *d)
 283 {
 284         gic_write_eoir(gic_irq(d));
 285 }
 286
 287 static void gic_eoimode1_eoi_irq(struct irq_data *d)
 288 {
 289         /*
 290          * No need to deactivate an LPI, or an interrupt that
 291          * is is getting forwarded to a vcpu.
 292          */
 293         if (gic_irq(d) >= 8192 || irqd_is_forwarded_to_vcpu(d))
 294                 return;
 295         gic_write_dir(gic_irq(d));
 296 }
 297
 298 static int gic_set_type(struct irq_data *d, unsigned int type)
 299 {
 300         unsigned int irq = gic_irq(d);
 301         void (*rwp_wait)(void);
 302         void __iomem *base;
 303
 304         /* Interrupt configuration for SGIs can't be changed */
 305         if (irq < 16)
 306                 return -EINVAL;
 307
 308         /* SPIs have restrictions on the supported types */
 309         if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
 310                          type != IRQ_TYPE_EDGE_RISING)
 311                 return -EINVAL;
 312
 313         if (gic_irq_in_rdist(d)) {
 314                 base = gic_data_rdist_sgi_base();
 315                 rwp_wait = gic_redist_wait_for_rwp;
 316         } else {
 317                 base = gic_data.dist_base;
 318                 rwp_wait = gic_dist_wait_for_rwp;
 319         }
 320
 321         return gic_configure_irq(irq, type, base, rwp_wait);
 322 }
 323
 324 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
 325 {
 326         if (vcpu)
 327                 irqd_set_forwarded_to_vcpu(d);
 328         else
 329                 irqd_clr_forwarded_to_vcpu(d);
 330         return 0;
 331 }
 332
 333 static u64 gic_mpidr_to_affinity(unsigned long mpidr)
 334 {
 335         u64 aff;
 336
 337         aff = ((u64)MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 |
 338                MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 339                MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8  |
 340                MPIDR_AFFINITY_LEVEL(mpidr, 0));
 341
 342         return aff;
 343 }
 344
 345 static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 346 {
 347         u32 irqnr;
 348
 349         do {
 350                 irqnr = gic_read_iar();
 351
 352                 if (likely(irqnr > 15 && irqnr < 1020) || irqnr >= 8192) {
 353                         int err;
 354
 355                         if (static_key_true(&supports_deactivate))
 356                                 gic_write_eoir(irqnr);
 357
 358                         err = handle_domain_irq(gic_data.domain, irqnr, regs);
 359                         if (err) {
 360                                 WARN_ONCE(true, "Unexpected interrupt received!\n");
 361                                 if (static_key_true(&supports_deactivate)) {
 362                                         if (irqnr < 8192)
 363                                                 gic_write_dir(irqnr);
 364                                 } else {
 365                                         gic_write_eoir(irqnr);
 366                                 }
 367                         }
 368                         continue;
 369                 }
 370                 if (irqnr < 16) {
 371                         gic_write_eoir(irqnr);
 372                         if (static_key_true(&supports_deactivate))
 373                                 gic_write_dir(irqnr);
 374 #ifdef CONFIG_SMP
 375                         /*
 376                          * Unlike GICv2, we don't need an smp_rmb() here.
 377                          * The control dependency from gic_read_iar to
 378                          * the ISB in gic_write_eoir is enough to ensure
 379                          * that any shared data read by handle_IPI will
 380                          * be read after the ACK.
 381                          */
 382                         handle_IPI(irqnr, regs);
 383 #else
 384                         WARN_ONCE(true, "Unexpected SGI received!\n");
 385 #endif
 386                         continue;
 387                 }
 388         } while (irqnr != ICC_IAR1_EL1_SPURIOUS);
 389 }
 390
 391 static void __init gic_dist_init(void)
 392 {
 393         unsigned int i;
 394         u64 affinity;
 395         void __iomem *base = gic_data.dist_base;
 396
 397         /* Disable the distributor */
 398         writel_relaxed(0, base + GICD_CTLR);
 399         gic_dist_wait_for_rwp();
 400
 401         /*
 402          * Configure SPIs as non-secure Group-1. This will only matter
 403          * if the GIC only has a single security state. This will not
 404          * do the right thing if the kernel is running in secure mode,
 405          * but that's not the intended use case anyway.
 406          */
 407         for (i = 32; i < gic_data.irq_nr; i += 32)
 408                 writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
 409
 410         gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp);
 411
 412         /* Enable distributor with ARE, Group1 */
 413         writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1,
 414                        base + GICD_CTLR);
 415
 416         /*
 417          * Set all global interrupts to the boot CPU only. ARE must be
 418          * enabled.
 419          */
 420         affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
 421         for (i = 32; i < gic_data.irq_nr; i++)
 422                 gic_write_irouter(affinity, base + GICD_IROUTER + i * 8);
 423 }
 424
 425 static int gic_populate_rdist(void)
 426 {
 427         unsigned long mpidr = cpu_logical_map(smp_processor_id());
 428         u64 typer;
 429         u32 aff;
 430         int i;
 431
 432         /*
 433          * Convert affinity to a 32bit value that can be matched to
 434          * GICR_TYPER bits [63:32].
 435          */
 436         aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
 437                MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 438                MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
 439                MPIDR_AFFINITY_LEVEL(mpidr, 0));
 440
 441         for (i = 0; i < gic_data.nr_redist_regions; i++) {
 442                 void __iomem *ptr = gic_data.redist_regions[i].redist_base;
 443                 u32 reg;
 444
 445                 reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
 446                 if (reg != GIC_PIDR2_ARCH_GICv3 &&
 447                     reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */
 448                         pr_warn("No redistributor present @%p\n", ptr);
 449                         break;
 450                 }
 451
 452                 do {
 453                         typer = gic_read_typer(ptr + GICR_TYPER);
 454                         if ((typer >> 32) == aff) {
 455                                 u64 offset = ptr - gic_data.redist_regions[i].redist_base;
 456                                 gic_data_rdist_rd_base() = ptr;
 457                                 gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset;
 458                                 pr_info("CPU%d: found redistributor %lx region %d:%pa\n",
 459                                         smp_processor_id(), mpidr, i,
 460                                         &gic_data_rdist()->phys_base);
 461                                 return 0;
 462                         }
 463
 464                         if (gic_data.redist_regions[i].single_redist)
 465                                 break;
 466
 467                         if (gic_data.redist_stride) {
 468                                 ptr += gic_data.redist_stride;
 469                         } else {
 470                                 ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
 471                                 if (typer & GICR_TYPER_VLPIS)
 472                                         ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
 473                         }
 474                 } while (!(typer & GICR_TYPER_LAST));
 475         }
 476
 477         /* We couldn't even deal with ourselves... */
 478         WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n",
 479              smp_processor_id(), mpidr);
 480         return -ENODEV;
 481 }
 482
 483 static void gic_cpu_sys_reg_init(void)
 484 {
 485         /*
 486          * Need to check that the SRE bit has actually been set. If
 487          * not, it means that SRE is disabled at EL2. We're going to
 488          * die painfully, and there is nothing we can do about it.
 489          *
 490          * Kindly inform the luser.
 491          */
 492         if (!gic_enable_sre())
 493                 pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
 494
 495         /* Set priority mask register */
 496         gic_write_pmr(DEFAULT_PMR_VALUE);
 497
 498         if (static_key_true(&supports_deactivate)) {
 499                 /* EOI drops priority only (mode 1) */
 500                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop);
 501         } else {
 502                 /* EOI deactivates interrupt too (mode 0) */
 503                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
 504         }
 505
 506         /* ... and let's hit the road... */
 507         gic_write_grpen1(1);
 508 }
 509
 510 static int gic_dist_supports_lpis(void)
 511 {
 512         return !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS);
 513 }
 514
 515 static void gic_cpu_init(void)
 516 {
 517         void __iomem *rbase;
 518
 519         /* Register ourselves with the rest of the world */
 520         if (gic_populate_rdist())
 521                 return;
 522
 523         gic_enable_redist(true);
 524
 525         rbase = gic_data_rdist_sgi_base();
 526
 527         /* Configure SGIs/PPIs as non-secure Group-1 */
 528         writel_relaxed(~0, rbase + GICR_IGROUPR0);
 529
 530         gic_cpu_config(rbase, gic_redist_wait_for_rwp);
 531
 532         /* Give LPIs a spin */
 533         if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
 534                 its_cpu_init();
 535
 536         /* initialise system registers */
 537         gic_cpu_sys_reg_init();
 538 }
 539
 540 #ifdef CONFIG_SMP
 541
 542 static int gic_starting_cpu(unsigned int cpu)
 543 {
 544         gic_cpu_init();
 545         return 0;
 546 }
 547
 548 static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask,
 549                                    unsigned long cluster_id)
 550 {
 551         int cpu = *base_cpu;
 552         unsigned long mpidr = cpu_logical_map(cpu);
 553         u16 tlist = 0;
 554
 555         while (cpu < nr_cpu_ids) {
 556                 /*
 557                  * If we ever get a cluster of more than 16 CPUs, just
 558                  * scream and skip that CPU.
 559                  */
 560                 if (WARN_ON((mpidr & 0xff) >= 16))
 561                         goto out;
 562
 563                 tlist |= 1 << (mpidr & 0xf);
 564
 565                 cpu = cpumask_next(cpu, mask);
 566                 if (cpu >= nr_cpu_ids)
 567                         goto out;
 568
 569                 mpidr = cpu_logical_map(cpu);
 570
 571                 if (cluster_id != (mpidr & ~0xffUL)) {
 572                         cpu--;
 573                         goto out;
 574                 }
 575         }
 576 out:
 577         *base_cpu = cpu;
 578         return tlist;
 579 }
 580
 581 #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
 582         (MPIDR_AFFINITY_LEVEL(cluster_id, level) \
 583                 << ICC_SGI1R_AFFINITY_## level ##_SHIFT)
 584
 585 static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
 586 {
 587         u64 val;
 588
 589         val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3)     |
 590                MPIDR_TO_SGI_AFFINITY(cluster_id, 2)     |
 591                irq << ICC_SGI1R_SGI_ID_SHIFT            |
 592                MPIDR_TO_SGI_AFFINITY(cluster_id, 1)     |
 593                tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
 594
 595         pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
 596         gic_write_sgi1r(val);
 597 }
 598
 599 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 600 {
 601         int cpu;
 602
 603         if (WARN_ON(irq >= 16))
 604                 return;
 605
 606         /*
 607          * Ensure that stores to Normal memory are visible to the
 608          * other CPUs before issuing the IPI.
 609          */
 610         smp_wmb();
 611
 612         for_each_cpu(cpu, mask) {
 613                 unsigned long cluster_id = cpu_logical_map(cpu) & ~0xffUL;
 614                 u16 tlist;
 615
 616                 tlist = gic_compute_target_list(&cpu, mask, cluster_id);
 617                 gic_send_sgi(cluster_id, tlist, irq);
 618         }
 619
 620         /* Force the above writes to ICC_SGI1R_EL1 to be executed */
 621         isb();
 622 }
 623
 624 static void gic_smp_init(void)
 625 {
 626         set_smp_cross_call(gic_raise_softirq);
 627         cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GICV3_STARTING,
 628                                   "AP_IRQ_GICV3_STARTING", gic_starting_cpu,
 629                                   NULL);
 630 }
 631
 632 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 633                             bool force)
 634 {
 635         unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
 636         void __iomem *reg;
 637         int enabled;
 638         u64 val;
 639
 640         if (gic_irq_in_rdist(d))
 641                 return -EINVAL;
 642
 643         /* If interrupt was enabled, disable it first */
 644         enabled = gic_peek_irq(d, GICD_ISENABLER);
 645         if (enabled)
 646                 gic_mask_irq(d);
 647
 648         reg = gic_dist_base(d) + GICD_IROUTER + (gic_irq(d) * 8);
 649         val = gic_mpidr_to_affinity(cpu_logical_map(cpu));
 650
 651         gic_write_irouter(val, reg);
 652
 653         /*
 654          * If the interrupt was enabled, enabled it again. Otherwise,
 655          * just wait for the distributor to have digested our changes.
 656          */
 657         if (enabled)
 658                 gic_unmask_irq(d);
 659         else
 660                 gic_dist_wait_for_rwp();
 661
 662         return IRQ_SET_MASK_OK_DONE;
 663 }
 664 #else
 665 #define gic_set_affinity        NULL
 666 #define gic_smp_init()          do { } while(0)
 667 #endif
 668
 669 #ifdef CONFIG_CPU_PM
 670 static int gic_cpu_pm_notifier(struct notifier_block *self,
 671                                unsigned long cmd, void *v)
 672 {
 673         if (cmd == CPU_PM_EXIT) {
 674                 gic_enable_redist(true);
 675                 gic_cpu_sys_reg_init();
 676         } else if (cmd == CPU_PM_ENTER) {
 677                 gic_write_grpen1(0);
 678                 gic_enable_redist(false);
 679         }
 680         return NOTIFY_OK;
 681 }
 682
 683 static struct notifier_block gic_cpu_pm_notifier_block = {
 684         .notifier_call = gic_cpu_pm_notifier,
 685 };
 686
 687 static void gic_cpu_pm_init(void)
 688 {
 689         cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
 690 }
 691
 692 #else
 693 static inline void gic_cpu_pm_init(void) { }
 694 #endif /* CONFIG_CPU_PM */
 695
 696 static struct irq_chip gic_chip = {
 697         .name                   = "GICv3",
 698         .irq_mask               = gic_mask_irq,
 699         .irq_unmask             = gic_unmask_irq,
 700         .irq_eoi                = gic_eoi_irq,
 701         .irq_set_type           = gic_set_type,
 702         .irq_set_affinity       = gic_set_affinity,
 703         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
 704         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 705         .flags                  = IRQCHIP_SET_TYPE_MASKED,
 706 };
 707
 708 static struct irq_chip gic_eoimode1_chip = {
 709         .name                   = "GICv3",
 710         .irq_mask               = gic_eoimode1_mask_irq,
 711         .irq_unmask             = gic_unmask_irq,
 712         .irq_eoi                = gic_eoimode1_eoi_irq,
 713         .irq_set_type           = gic_set_type,
 714         .irq_set_affinity       = gic_set_affinity,
 715         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
 716         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 717         .irq_set_vcpu_affinity  = gic_irq_set_vcpu_affinity,
 718         .flags                  = IRQCHIP_SET_TYPE_MASKED,
 719 };
 720
 721 #define GIC_ID_NR               (1U << gic_data.rdists.id_bits)
 722
 723 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
 724                               irq_hw_number_t hw)
 725 {
 726         struct irq_chip *chip = &gic_chip;
 727
 728         if (static_key_true(&supports_deactivate))
 729                 chip = &gic_eoimode1_chip;
 730
 731         /* SGIs are private to the core kernel */
 732         if (hw < 16)
 733                 return -EPERM;
 734         /* Nothing here */
 735         if (hw >= gic_data.irq_nr && hw < 8192)
 736                 return -EPERM;
 737         /* Off limits */
 738         if (hw >= GIC_ID_NR)
 739                 return -EPERM;
 740
 741         /* PPIs */
 742         if (hw < 32) {
 743                 irq_set_percpu_devid(irq);
 744                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 745                                     handle_percpu_devid_irq, NULL, NULL);
 746                 irq_set_status_flags(irq, IRQ_NOAUTOEN);
 747         }
 748         /* SPIs */
 749         if (hw >= 32 && hw < gic_data.irq_nr) {
 750                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 751                                     handle_fasteoi_irq, NULL, NULL);
 752                 irq_set_probe(irq);
 753         }
 754         /* LPIs */
 755         if (hw >= 8192 && hw < GIC_ID_NR) {
 756                 if (!gic_dist_supports_lpis())
 757                         return -EPERM;
 758                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 759                                     handle_fasteoi_irq, NULL, NULL);
 760         }
 761
 762         return 0;
 763 }
 764
 765 static int gic_irq_domain_translate(struct irq_domain *d,
 766                                     struct irq_fwspec *fwspec,
 767                                     unsigned long *hwirq,
 768                                     unsigned int *type)
 769 {
 770         if (is_of_node(fwspec->fwnode)) {
 771                 if (fwspec->param_count < 3)
 772                         return -EINVAL;
 773
 774                 switch (fwspec->param[0]) {
 775                 case 0:                 /* SPI */
 776                         *hwirq = fwspec->param[1] + 32;
 777                         break;
 778                 case 1:                 /* PPI */
 779                         *hwirq = fwspec->param[1] + 16;
 780                         break;
 781                 case GIC_IRQ_TYPE_LPI:  /* LPI */
 782                         *hwirq = fwspec->param[1];
 783                         break;
 784                 default:
 785                         return -EINVAL;
 786                 }
 787
 788                 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
 789                 return 0;
 790         }
 791
 792         if (is_fwnode_irqchip(fwspec->fwnode)) {
 793                 if(fwspec->param_count != 2)
 794                         return -EINVAL;
 795
 796                 *hwirq = fwspec->param[0];
 797                 *type = fwspec->param[1];
 798                 return 0;
 799         }
 800
 801         return -EINVAL;
 802 }
 803
 804 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 805                                 unsigned int nr_irqs, void *arg)
 806 {
 807         int i, ret;
 808         irq_hw_number_t hwirq;
 809         unsigned int type = IRQ_TYPE_NONE;
 810         struct irq_fwspec *fwspec = arg;
 811
 812         ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
 813         if (ret)
 814                 return ret;
 815
 816         for (i = 0; i < nr_irqs; i++)
 817                 gic_irq_domain_map(domain, virq + i, hwirq + i);
 818
 819         return 0;
 820 }
 821
 822 static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
 823                                 unsigned int nr_irqs)
 824 {
 825         int i;
 826
 827         for (i = 0; i < nr_irqs; i++) {
 828                 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
 829                 irq_set_handler(virq + i, NULL);
 830                 irq_domain_reset_irq_data(d);
 831         }
 832 }
 833
 834 static int gic_irq_domain_select(struct irq_domain *d,
 835                                  struct irq_fwspec *fwspec,
 836                                  enum irq_domain_bus_token bus_token)
 837 {
 838         /* Not for us */
 839         if (fwspec->fwnode != d->fwnode)
 840                 return 0;
 841
 842         /* If this is not DT, then we have a single domain */
 843         if (!is_of_node(fwspec->fwnode))
 844                 return 1;
 845
 846         /*
 847          * If this is a PPI and we have a 4th (non-null) parameter,
 848          * then we need to match the partition domain.
 849          */
 850         if (fwspec->param_count >= 4 &&
 851             fwspec->param[0] == 1 && fwspec->param[3] != 0)
 852                 return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]);
 853
 854         return d == gic_data.domain;
 855 }
 856
 857 static const struct irq_domain_ops gic_irq_domain_ops = {
 858         .translate = gic_irq_domain_translate,
 859         .alloc = gic_irq_domain_alloc,
 860         .free = gic_irq_domain_free,
 861         .select = gic_irq_domain_select,
 862 };
 863
 864 static int partition_domain_translate(struct irq_domain *d,
 865                                       struct irq_fwspec *fwspec,
 866                                       unsigned long *hwirq,
 867                                       unsigned int *type)
 868 {
 869         struct device_node *np;
 870         int ret;
 871
 872         np = of_find_node_by_phandle(fwspec->param[3]);
 873         if (WARN_ON(!np))
 874                 return -EINVAL;
 875
 876         ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]],
 877                                      of_node_to_fwnode(np));
 878         if (ret < 0)
 879                 return ret;
 880
 881         *hwirq = ret;
 882         *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
 883
 884         return 0;
 885 }
 886
 887 static const struct irq_domain_ops partition_domain_ops = {
 888         .translate = partition_domain_translate,
 889         .select = gic_irq_domain_select,
 890 };
 891
 892 static void gicv3_enable_quirks(void)
 893 {
 894 #ifdef CONFIG_ARM64
 895         if (cpus_have_cap(ARM64_WORKAROUND_CAVIUM_23154))
 896                 static_branch_enable(&is_cavium_thunderx);
 897 #endif
 898 }
 899
 900 static int __init gic_init_bases(void __iomem *dist_base,
 901                                  struct redist_region *rdist_regs,
 902                                  u32 nr_redist_regions,
 903                                  u64 redist_stride,
 904                                  struct fwnode_handle *handle)
 905 {
 906         struct device_node *node;
 907         u32 typer;
 908         int gic_irqs;
 909         int err;
 910
 911         if (!is_hyp_mode_available())
 912                 static_key_slow_dec(&supports_deactivate);
 913
 914         if (static_key_true(&supports_deactivate))
 915                 pr_info("GIC: Using split EOI/Deactivate mode\n");
 916
 917         gic_data.fwnode = handle;
 918         gic_data.dist_base = dist_base;
 919         gic_data.redist_regions = rdist_regs;
 920         gic_data.nr_redist_regions = nr_redist_regions;
 921         gic_data.redist_stride = redist_stride;
 922
 923         gicv3_enable_quirks();
 924
 925         /*
 926          * Find out how many interrupts are supported.
 927          * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
 928          */
 929         typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
 930         gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer);
 931         gic_irqs = GICD_TYPER_IRQS(typer);
 932         if (gic_irqs > 1020)
 933                 gic_irqs = 1020;
 934         gic_data.irq_nr = gic_irqs;
 935
 936         gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
 937                                                  &gic_data);
 938         gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
 939
 940         if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
 941                 err = -ENOMEM;
 942                 goto out_free;
 943         }
 944
 945         set_handle_irq(gic_handle_irq);
 946
 947         node = to_of_node(handle);
 948         if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis() &&
 949             node) /* Temp hack to prevent ITS init for ACPI */
 950                 its_init(node, &gic_data.rdists, gic_data.domain);
 951
 952         gic_smp_init();
 953         gic_dist_init();
 954         gic_cpu_init();
 955         gic_cpu_pm_init();
 956
 957         return 0;
 958
 959 out_free:
 960         if (gic_data.domain)
 961                 irq_domain_remove(gic_data.domain);
 962         free_percpu(gic_data.rdists.rdist);
 963         return err;
 964 }
 965
 966 static int __init gic_validate_dist_version(void __iomem *dist_base)
 967 {
 968         u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
 969
 970         if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4)
 971                 return -ENODEV;
 972
 973         return 0;
 974 }
 975
 976 static int get_cpu_number(struct device_node *dn)
 977 {
 978         const __be32 *cell;
 979         u64 hwid;
 980         int i;
 981
 982         cell = of_get_property(dn, "reg", NULL);
 983         if (!cell)
 984                 return -1;
 985
 986         hwid = of_read_number(cell, of_n_addr_cells(dn));
 987
 988         /*
 989          * Non affinity bits must be set to 0 in the DT
 990          */
 991         if (hwid & ~MPIDR_HWID_BITMASK)
 992                 return -1;
 993
 994         for (i = 0; i < num_possible_cpus(); i++)
 995                 if (cpu_logical_map(i) == hwid)
 996                         return i;
 997
 998         return -1;
 999 }
1000
1001 /* Create all possible partitions at boot time */
1002 static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
1003 {
1004         struct device_node *parts_node, *child_part;
1005         int part_idx = 0, i;
1006         int nr_parts;
1007         struct partition_affinity *parts;
1008
1009         parts_node = of_find_node_by_name(gic_node, "ppi-partitions");
1010         if (!parts_node)
1011                 return;
1012
1013         nr_parts = of_get_child_count(parts_node);
1014
1015         if (!nr_parts)
1016                 return;
1017
1018         parts = kzalloc(sizeof(*parts) * nr_parts, GFP_KERNEL);
1019         if (WARN_ON(!parts))
1020                 return;
1021
1022         for_each_child_of_node(parts_node, child_part) {
1023                 struct partition_affinity *part;
1024                 int n;
1025
1026                 part = &parts[part_idx];
1027
1028                 part->partition_id = of_node_to_fwnode(child_part);
1029
1030                 pr_info("GIC: PPI partition %s[%d] { ",
1031                         child_part->name, part_idx);
1032
1033                 n = of_property_count_elems_of_size(child_part, "affinity",
1034                                                     sizeof(u32));
1035                 WARN_ON(n <= 0);
1036
1037                 for (i = 0; i < n; i++) {
1038                         int err, cpu;
1039                         u32 cpu_phandle;
1040                         struct device_node *cpu_node;
1041
1042                         err = of_property_read_u32_index(child_part, "affinity",
1043                                                          i, &cpu_phandle);
1044                         if (WARN_ON(err))
1045                                 continue;
1046
1047                         cpu_node = of_find_node_by_phandle(cpu_phandle);
1048                         if (WARN_ON(!cpu_node))
1049                                 continue;
1050
1051                         cpu = get_cpu_number(cpu_node);
1052                         if (WARN_ON(cpu == -1))
1053                                 continue;
1054
1055                         pr_cont("%s[%d] ", cpu_node->full_name, cpu);
1056
1057                         cpumask_set_cpu(cpu, &part->mask);
1058                 }
1059
1060                 pr_cont("}\n");
1061                 part_idx++;
1062         }
1063
1064         for (i = 0; i < 16; i++) {
1065                 unsigned int irq;
1066                 struct partition_desc *desc;
1067                 struct irq_fwspec ppi_fwspec = {
1068                         .fwnode         = gic_data.fwnode,
1069                         .param_count    = 3,
1070                         .param          = {
1071                                 [0]     = 1,
1072                                 [1]     = i,
1073                                 [2]     = IRQ_TYPE_NONE,
1074                         },
1075                 };
1076
1077                 irq = irq_create_fwspec_mapping(&ppi_fwspec);
1078                 if (WARN_ON(!irq))
1079                         continue;
1080                 desc = partition_create_desc(gic_data.fwnode, parts, nr_parts,
1081                                              irq, &partition_domain_ops);
1082                 if (WARN_ON(!desc))
1083                         continue;
1084
1085                 gic_data.ppi_descs[i] = desc;
1086         }
1087 }
1088
1089 static void __init gic_of_setup_kvm_info(struct device_node *node)
1090 {
1091         int ret;
1092         struct resource r;
1093         u32 gicv_idx;
1094
1095         gic_v3_kvm_info.type = GIC_V3;
1096
1097         gic_v3_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1098         if (!gic_v3_kvm_info.maint_irq)
1099                 return;
1100
1101         if (of_property_read_u32(node, "#redistributor-regions",
1102                                  &gicv_idx))
1103                 gicv_idx = 1;
1104
1105         gicv_idx += 3;  /* Also skip GICD, GICC, GICH */
1106         ret = of_address_to_resource(node, gicv_idx, &r);
1107         if (!ret)
1108                 gic_v3_kvm_info.vcpu = r;
1109
1110         gic_set_kvm_info(&gic_v3_kvm_info);
1111 }
1112
1113 static int __init gic_of_init(struct device_node *node, struct device_node *parent)
1114 {
1115         void __iomem *dist_base;
1116         struct redist_region *rdist_regs;
1117         u64 redist_stride;
1118         u32 nr_redist_regions;
1119         int err, i;
1120
1121         dist_base = of_iomap(node, 0);
1122         if (!dist_base) {
1123                 pr_err("%s: unable to map gic dist registers\n",
1124                         node->full_name);
1125                 return -ENXIO;
1126         }
1127
1128         err = gic_validate_dist_version(dist_base);
1129         if (err) {
1130                 pr_err("%s: no distributor detected, giving up\n",
1131                         node->full_name);
1132                 goto out_unmap_dist;
1133         }
1134
1135         if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
1136                 nr_redist_regions = 1;
1137
1138         rdist_regs = kzalloc(sizeof(*rdist_regs) * nr_redist_regions, GFP_KERNEL);
1139         if (!rdist_regs) {
1140                 err = -ENOMEM;
1141                 goto out_unmap_dist;
1142         }
1143
1144         for (i = 0; i < nr_redist_regions; i++) {
1145                 struct resource res;
1146                 int ret;
1147
1148                 ret = of_address_to_resource(node, 1 + i, &res);
1149                 rdist_regs[i].redist_base = of_iomap(node, 1 + i);
1150                 if (ret || !rdist_regs[i].redist_base) {
1151                         pr_err("%s: couldn't map region %d\n",
1152                                node->full_name, i);
1153                         err = -ENODEV;
1154                         goto out_unmap_rdist;
1155                 }
1156                 rdist_regs[i].phys_base = res.start;
1157         }
1158
1159         if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
1160                 redist_stride = 0;
1161
1162         err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions,
1163                              redist_stride, &node->fwnode);
1164         if (err)
1165                 goto out_unmap_rdist;
1166
1167         gic_populate_ppi_partitions(node);
1168         gic_of_setup_kvm_info(node);
1169         return 0;
1170
1171 out_unmap_rdist:
1172         for (i = 0; i < nr_redist_regions; i++)
1173                 if (rdist_regs[i].redist_base)
1174                         iounmap(rdist_regs[i].redist_base);
1175         kfree(rdist_regs);
1176 out_unmap_dist:
1177         iounmap(dist_base);
1178         return err;
1179 }
1180
1181 IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);
1182
1183 #ifdef CONFIG_ACPI
1184 static struct
1185 {
1186         void __iomem *dist_base;
1187         struct redist_region *redist_regs;
1188         u32 nr_redist_regions;
1189         bool single_redist;
1190         u32 maint_irq;
1191         int maint_irq_mode;
1192         phys_addr_t vcpu_base;
1193 } acpi_data __initdata;
1194
1195 static void __init
1196 gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base)
1197 {
1198         static int count = 0;
1199
1200         acpi_data.redist_regs[count].phys_base = phys_base;
1201         acpi_data.redist_regs[count].redist_base = redist_base;
1202         acpi_data.redist_regs[count].single_redist = acpi_data.single_redist;
1203         count++;
1204 }
1205
1206 static int __init
1207 gic_acpi_parse_madt_redist(struct acpi_subtable_header *header,
1208                            const unsigned long end)
1209 {
1210         struct acpi_madt_generic_redistributor *redist =
1211                         (struct acpi_madt_generic_redistributor *)header;
1212         void __iomem *redist_base;
1213
1214         redist_base = ioremap(redist->base_address, redist->length);
1215         if (!redist_base) {
1216                 pr_err("Couldn't map GICR region @%llx\n", redist->base_address);
1217                 return -ENOMEM;
1218         }
1219
1220         gic_acpi_register_redist(redist->base_address, redist_base);
1221         return 0;
1222 }
1223
1224 static int __init
1225 gic_acpi_parse_madt_gicc(struct acpi_subtable_header *header,
1226                          const unsigned long end)
1227 {
1228         struct acpi_madt_generic_interrupt *gicc =
1229                                 (struct acpi_madt_generic_interrupt *)header;
1230         u32 reg = readl_relaxed(acpi_data.dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1231         u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2;
1232         void __iomem *redist_base;
1233
1234         redist_base = ioremap(gicc->gicr_base_address, size);
1235         if (!redist_base)
1236                 return -ENOMEM;
1237
1238         gic_acpi_register_redist(gicc->gicr_base_address, redist_base);
1239         return 0;
1240 }
1241
1242 static int __init gic_acpi_collect_gicr_base(void)
1243 {
1244         acpi_tbl_entry_handler redist_parser;
1245         enum acpi_madt_type type;
1246
1247         if (acpi_data.single_redist) {
1248                 type = ACPI_MADT_TYPE_GENERIC_INTERRUPT;
1249                 redist_parser = gic_acpi_parse_madt_gicc;
1250         } else {
1251                 type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR;
1252                 redist_parser = gic_acpi_parse_madt_redist;
1253         }
1254
1255         /* Collect redistributor base addresses in GICR entries */
1256         if (acpi_table_parse_madt(type, redist_parser, 0) > 0)
1257                 return 0;
1258
1259         pr_info("No valid GICR entries exist\n");
1260         return -ENODEV;
1261 }
1262
1263 static int __init gic_acpi_match_gicr(struct acpi_subtable_header *header,
1264                                   const unsigned long end)
1265 {
1266         /* Subtable presence means that redist exists, that's it */
1267         return 0;
1268 }
1269
1270 static int __init gic_acpi_match_gicc(struct acpi_subtable_header *header,
1271                                       const unsigned long end)
1272 {
1273         struct acpi_madt_generic_interrupt *gicc =
1274                                 (struct acpi_madt_generic_interrupt *)header;
1275
1276         /*
1277          * If GICC is enabled and has valid gicr base address, then it means
1278          * GICR base is presented via GICC
1279          */
1280         if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address)
1281                 return 0;
1282
1283         return -ENODEV;
1284 }
1285
1286 static int __init gic_acpi_count_gicr_regions(void)
1287 {
1288         int count;
1289
1290         /*
1291          * Count how many redistributor regions we have. It is not allowed
1292          * to mix redistributor description, GICR and GICC subtables have to be
1293          * mutually exclusive.
1294          */
1295         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1296                                       gic_acpi_match_gicr, 0);
1297         if (count > 0) {
1298                 acpi_data.single_redist = false;
1299                 return count;
1300         }
1301
1302         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1303                                       gic_acpi_match_gicc, 0);
1304         if (count > 0)
1305                 acpi_data.single_redist = true;
1306
1307         return count;
1308 }
1309
1310 static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header,
1311                                            struct acpi_probe_entry *ape)
1312 {
1313         struct acpi_madt_generic_distributor *dist;
1314         int count;
1315
1316         dist = (struct acpi_madt_generic_distributor *)header;
1317         if (dist->version != ape->driver_data)
1318                 return false;
1319
1320         /* We need to do that exercise anyway, the sooner the better */
1321         count = gic_acpi_count_gicr_regions();
1322         if (count <= 0)
1323                 return false;
1324
1325         acpi_data.nr_redist_regions = count;
1326         return true;
1327 }
1328
1329 static int __init gic_acpi_parse_virt_madt_gicc(struct acpi_subtable_header *header,
1330                                                 const unsigned long end)
1331 {
1332         struct acpi_madt_generic_interrupt *gicc =
1333                 (struct acpi_madt_generic_interrupt *)header;
1334         int maint_irq_mode;
1335         static int first_madt = true;
1336
1337         /* Skip unusable CPUs */
1338         if (!(gicc->flags & ACPI_MADT_ENABLED))
1339                 return 0;
1340
1341         maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
1342                 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
1343
1344         if (first_madt) {
1345                 first_madt = false;
1346
1347                 acpi_data.maint_irq = gicc->vgic_interrupt;
1348                 acpi_data.maint_irq_mode = maint_irq_mode;
1349                 acpi_data.vcpu_base = gicc->gicv_base_address;
1350
1351                 return 0;
1352         }
1353
1354         /*
1355          * The maintenance interrupt and GICV should be the same for every CPU
1356          */
1357         if ((acpi_data.maint_irq != gicc->vgic_interrupt) ||
1358             (acpi_data.maint_irq_mode != maint_irq_mode) ||
1359             (acpi_data.vcpu_base != gicc->gicv_base_address))
1360                 return -EINVAL;
1361
1362         return 0;
1363 }
1364
1365 static bool __init gic_acpi_collect_virt_info(void)
1366 {
1367         int count;
1368
1369         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1370                                       gic_acpi_parse_virt_madt_gicc, 0);
1371
1372         return (count > 0);
1373 }
1374
1375 #define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K)
1376 #define ACPI_GICV2_VCTRL_MEM_SIZE       (SZ_4K)
1377 #define ACPI_GICV2_VCPU_MEM_SIZE        (SZ_8K)
1378
1379 static void __init gic_acpi_setup_kvm_info(void)
1380 {
1381         int irq;
1382
1383         if (!gic_acpi_collect_virt_info()) {
1384                 pr_warn("Unable to get hardware information used for virtualization\n");
1385                 return;
1386         }
1387
1388         gic_v3_kvm_info.type = GIC_V3;
1389
1390         irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
1391                                 acpi_data.maint_irq_mode,
1392                                 ACPI_ACTIVE_HIGH);
1393         if (irq <= 0)
1394                 return;
1395
1396         gic_v3_kvm_info.maint_irq = irq;
1397
1398         if (acpi_data.vcpu_base) {
1399                 struct resource *vcpu = &gic_v3_kvm_info.vcpu;
1400
1401                 vcpu->flags = IORESOURCE_MEM;
1402                 vcpu->start = acpi_data.vcpu_base;
1403                 vcpu->end = vcpu->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
1404         }
1405
1406         gic_set_kvm_info(&gic_v3_kvm_info);
1407 }
1408
1409 static int __init
1410 gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end)
1411 {
1412         struct acpi_madt_generic_distributor *dist;
1413         struct fwnode_handle *domain_handle;
1414         size_t size;
1415         int i, err;
1416
1417         /* Get distributor base address */
1418         dist = (struct acpi_madt_generic_distributor *)header;
1419         acpi_data.dist_base = ioremap(dist->base_address,
1420                                       ACPI_GICV3_DIST_MEM_SIZE);
1421         if (!acpi_data.dist_base) {
1422                 pr_err("Unable to map GICD registers\n");
1423                 return -ENOMEM;
1424         }
1425
1426         err = gic_validate_dist_version(acpi_data.dist_base);
1427         if (err) {
1428                 pr_err("No distributor detected at @%p, giving up",
1429                        acpi_data.dist_base);
1430                 goto out_dist_unmap;
1431         }
1432
1433         size = sizeof(*acpi_data.redist_regs) * acpi_data.nr_redist_regions;
1434         acpi_data.redist_regs = kzalloc(size, GFP_KERNEL);
1435         if (!acpi_data.redist_regs) {
1436                 err = -ENOMEM;
1437                 goto out_dist_unmap;
1438         }
1439
1440         err = gic_acpi_collect_gicr_base();
1441         if (err)
1442                 goto out_redist_unmap;
1443
1444         domain_handle = irq_domain_alloc_fwnode(acpi_data.dist_base);
1445         if (!domain_handle) {
1446                 err = -ENOMEM;
1447                 goto out_redist_unmap;
1448         }
1449
1450         err = gic_init_bases(acpi_data.dist_base, acpi_data.redist_regs,
1451                              acpi_data.nr_redist_regions, 0, domain_handle);
1452         if (err)
1453                 goto out_fwhandle_free;
1454
1455         acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1456         gic_acpi_setup_kvm_info();
1457
1458         return 0;
1459
1460 out_fwhandle_free:
1461         irq_domain_free_fwnode(domain_handle);
1462 out_redist_unmap:
1463         for (i = 0; i < acpi_data.nr_redist_regions; i++)
1464                 if (acpi_data.redist_regs[i].redist_base)
1465                         iounmap(acpi_data.redist_regs[i].redist_base);
1466         kfree(acpi_data.redist_regs);
1467 out_dist_unmap:
1468         iounmap(acpi_data.dist_base);
1469         return err;
1470 }
1471 IRQCHIP_ACPI_DECLARE(gic_v3, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1472                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V3,
1473                      gic_acpi_init);
1474 IRQCHIP_ACPI_DECLARE(gic_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1475                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V4,
1476                      gic_acpi_init);
1477 IRQCHIP_ACPI_DECLARE(gic_v3_or_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1478                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_NONE,
1479                      gic_acpi_init);
1480 #endif