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 #include <linux/cpu.h>
  19 #include <linux/cpu_pm.h>
  20 #include <linux/delay.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/of.h>
  23 #include <linux/of_address.h>
  24 #include <linux/of_irq.h>
  25 #include <linux/percpu.h>
  26 #include <linux/slab.h>
  27
  28 #include <linux/irqchip.h>
  29 #include <linux/irqchip/arm-gic-v3.h>
  30
  31 #include <asm/cputype.h>
  32 #include <asm/exception.h>
  33 #include <asm/smp_plat.h>
  34 #include <asm/virt.h>
  35
  36 #include "irq-gic-common.h"
  37
  38 struct redist_region {
  39         void __iomem            *redist_base;
  40         phys_addr_t             phys_base;
  41 };
  42
  43 struct gic_chip_data {
  44         void __iomem            *dist_base;
  45         struct redist_region    *redist_regions;
  46         struct rdists           rdists;
  47         struct irq_domain       *domain;
  48         u64                     redist_stride;
  49         u32                     nr_redist_regions;
  50         unsigned int            irq_nr;
  51 };
  52
  53 static struct gic_chip_data gic_data __read_mostly;
  54 static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
  55
  56 #define gic_data_rdist()                (this_cpu_ptr(gic_data.rdists.rdist))
  57 #define gic_data_rdist_rd_base()        (gic_data_rdist()->rd_base)
  58 #define gic_data_rdist_sgi_base()       (gic_data_rdist_rd_base() + SZ_64K)
  59
  60 /* Our default, arbitrary priority value. Linux only uses one anyway. */
  61 #define DEFAULT_PMR_VALUE       0xf0
  62
  63 static inline unsigned int gic_irq(struct irq_data *d)
  64 {
  65         return d->hwirq;
  66 }
  67
  68 static inline int gic_irq_in_rdist(struct irq_data *d)
  69 {
  70         return gic_irq(d) < 32;
  71 }
  72
  73 static inline void __iomem *gic_dist_base(struct irq_data *d)
  74 {
  75         if (gic_irq_in_rdist(d))        /* SGI+PPI -> SGI_base for this CPU */
  76                 return gic_data_rdist_sgi_base();
  77
  78         if (d->hwirq <= 1023)           /* SPI -> dist_base */
  79                 return gic_data.dist_base;
  80
  81         return NULL;
  82 }
  83
  84 static void gic_do_wait_for_rwp(void __iomem *base)
  85 {
  86         u32 count = 1000000;    /* 1s! */
  87
  88         while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) {
  89                 count--;
  90                 if (!count) {
  91                         pr_err_ratelimited("RWP timeout, gone fishing\n");
  92                         return;
  93                 }
  94                 cpu_relax();
  95                 udelay(1);
  96         };
  97 }
  98
  99 /* Wait for completion of a distributor change */
 100 static void gic_dist_wait_for_rwp(void)
 101 {
 102         gic_do_wait_for_rwp(gic_data.dist_base);
 103 }
 104
 105 /* Wait for completion of a redistributor change */
 106 static void gic_redist_wait_for_rwp(void)
 107 {
 108         gic_do_wait_for_rwp(gic_data_rdist_rd_base());
 109 }
 110
 111 #ifdef CONFIG_ARM64
 112 static DEFINE_STATIC_KEY_FALSE(is_cavium_thunderx);
 113
 114 static u64 __maybe_unused gic_read_iar(void)
 115 {
 116         if (static_branch_unlikely(&is_cavium_thunderx))
 117                 return gic_read_iar_cavium_thunderx();
 118         else
 119                 return gic_read_iar_common();
 120 }
 121 #endif
 122
 123 static void gic_enable_redist(bool enable)
 124 {
 125         void __iomem *rbase;
 126         u32 count = 1000000;    /* 1s! */
 127         u32 val;
 128
 129         rbase = gic_data_rdist_rd_base();
 130
 131         val = readl_relaxed(rbase + GICR_WAKER);
 132         if (enable)
 133                 /* Wake up this CPU redistributor */
 134                 val &= ~GICR_WAKER_ProcessorSleep;
 135         else
 136                 val |= GICR_WAKER_ProcessorSleep;
 137         writel_relaxed(val, rbase + GICR_WAKER);
 138
 139         if (!enable) {          /* Check that GICR_WAKER is writeable */
 140                 val = readl_relaxed(rbase + GICR_WAKER);
 141                 if (!(val & GICR_WAKER_ProcessorSleep))
 142                         return; /* No PM support in this redistributor */
 143         }
 144
 145         while (count--) {
 146                 val = readl_relaxed(rbase + GICR_WAKER);
 147                 if (enable ^ (val & GICR_WAKER_ChildrenAsleep))
 148                         break;
 149                 cpu_relax();
 150                 udelay(1);
 151         };
 152         if (!count)
 153                 pr_err_ratelimited("redistributor failed to %s...\n",
 154                                    enable ? "wakeup" : "sleep");
 155 }
 156
 157 /*
 158  * Routines to disable, enable, EOI and route interrupts
 159  */
 160 static int gic_peek_irq(struct irq_data *d, u32 offset)
 161 {
 162         u32 mask = 1 << (gic_irq(d) % 32);
 163         void __iomem *base;
 164
 165         if (gic_irq_in_rdist(d))
 166                 base = gic_data_rdist_sgi_base();
 167         else
 168                 base = gic_data.dist_base;
 169
 170         return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask);
 171 }
 172
 173 static void gic_poke_irq(struct irq_data *d, u32 offset)
 174 {
 175         u32 mask = 1 << (gic_irq(d) % 32);
 176         void (*rwp_wait)(void);
 177         void __iomem *base;
 178
 179         if (gic_irq_in_rdist(d)) {
 180                 base = gic_data_rdist_sgi_base();
 181                 rwp_wait = gic_redist_wait_for_rwp;
 182         } else {
 183                 base = gic_data.dist_base;
 184                 rwp_wait = gic_dist_wait_for_rwp;
 185         }
 186
 187         writel_relaxed(mask, base + offset + (gic_irq(d) / 32) * 4);
 188         rwp_wait();
 189 }
 190
 191 static void gic_mask_irq(struct irq_data *d)
 192 {
 193         gic_poke_irq(d, GICD_ICENABLER);
 194 }
 195
 196 static void gic_eoimode1_mask_irq(struct irq_data *d)
 197 {
 198         gic_mask_irq(d);
 199         /*
 200          * When masking a forwarded interrupt, make sure it is
 201          * deactivated as well.
 202          *
 203          * This ensures that an interrupt that is getting
 204          * disabled/masked will not get "stuck", because there is
 205          * noone to deactivate it (guest is being terminated).
 206          */
 207         if (irqd_is_forwarded_to_vcpu(d))
 208                 gic_poke_irq(d, GICD_ICACTIVER);
 209 }
 210
 211 static void gic_unmask_irq(struct irq_data *d)
 212 {
 213         gic_poke_irq(d, GICD_ISENABLER);
 214 }
 215
 216 static int gic_irq_set_irqchip_state(struct irq_data *d,
 217                                      enum irqchip_irq_state which, bool val)
 218 {
 219         u32 reg;
 220
 221         if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
 222                 return -EINVAL;
 223
 224         switch (which) {
 225         case IRQCHIP_STATE_PENDING:
 226                 reg = val ? GICD_ISPENDR : GICD_ICPENDR;
 227                 break;
 228
 229         case IRQCHIP_STATE_ACTIVE:
 230                 reg = val ? GICD_ISACTIVER : GICD_ICACTIVER;
 231                 break;
 232
 233         case IRQCHIP_STATE_MASKED:
 234                 reg = val ? GICD_ICENABLER : GICD_ISENABLER;
 235                 break;
 236
 237         default:
 238                 return -EINVAL;
 239         }
 240
 241         gic_poke_irq(d, reg);
 242         return 0;
 243 }
 244
 245 static int gic_irq_get_irqchip_state(struct irq_data *d,
 246                                      enum irqchip_irq_state which, bool *val)
 247 {
 248         if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
 249                 return -EINVAL;
 250
 251         switch (which) {
 252         case IRQCHIP_STATE_PENDING:
 253                 *val = gic_peek_irq(d, GICD_ISPENDR);
 254                 break;
 255
 256         case IRQCHIP_STATE_ACTIVE:
 257                 *val = gic_peek_irq(d, GICD_ISACTIVER);
 258                 break;
 259
 260         case IRQCHIP_STATE_MASKED:
 261                 *val = !gic_peek_irq(d, GICD_ISENABLER);
 262                 break;
 263
 264         default:
 265                 return -EINVAL;
 266         }
 267
 268         return 0;
 269 }
 270
 271 static void gic_eoi_irq(struct irq_data *d)
 272 {
 273         gic_write_eoir(gic_irq(d));
 274 }
 275
 276 static void gic_eoimode1_eoi_irq(struct irq_data *d)
 277 {
 278         /*
 279          * No need to deactivate an LPI, or an interrupt that
 280          * is is getting forwarded to a vcpu.
 281          */
 282         if (gic_irq(d) >= 8192 || irqd_is_forwarded_to_vcpu(d))
 283                 return;
 284         gic_write_dir(gic_irq(d));
 285 }
 286
 287 static int gic_set_type(struct irq_data *d, unsigned int type)
 288 {
 289         unsigned int irq = gic_irq(d);
 290         void (*rwp_wait)(void);
 291         void __iomem *base;
 292
 293         /* Interrupt configuration for SGIs can't be changed */
 294         if (irq < 16)
 295                 return -EINVAL;
 296
 297         /* SPIs have restrictions on the supported types */
 298         if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
 299                          type != IRQ_TYPE_EDGE_RISING)
 300                 return -EINVAL;
 301
 302         if (gic_irq_in_rdist(d)) {
 303                 base = gic_data_rdist_sgi_base();
 304                 rwp_wait = gic_redist_wait_for_rwp;
 305         } else {
 306                 base = gic_data.dist_base;
 307                 rwp_wait = gic_dist_wait_for_rwp;
 308         }
 309
 310         return gic_configure_irq(irq, type, base, rwp_wait);
 311 }
 312
 313 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
 314 {
 315         if (vcpu)
 316                 irqd_set_forwarded_to_vcpu(d);
 317         else
 318                 irqd_clr_forwarded_to_vcpu(d);
 319         return 0;
 320 }
 321
 322 static u64 gic_mpidr_to_affinity(u64 mpidr)
 323 {
 324         u64 aff;
 325
 326         aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 |
 327                MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 328                MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8  |
 329                MPIDR_AFFINITY_LEVEL(mpidr, 0));
 330
 331         return aff;
 332 }
 333
 334 static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 335 {
 336         u64 irqnr;
 337
 338         do {
 339                 irqnr = gic_read_iar();
 340
 341                 if (likely(irqnr > 15 && irqnr < 1020) || irqnr >= 8192) {
 342                         int err;
 343
 344                         if (static_key_true(&supports_deactivate))
 345                                 gic_write_eoir(irqnr);
 346
 347                         err = handle_domain_irq(gic_data.domain, irqnr, regs);
 348                         if (err) {
 349                                 WARN_ONCE(true, "Unexpected interrupt received!\n");
 350                                 if (static_key_true(&supports_deactivate)) {
 351                                         if (irqnr < 8192)
 352                                                 gic_write_dir(irqnr);
 353                                 } else {
 354                                         gic_write_eoir(irqnr);
 355                                 }
 356                         }
 357                         continue;
 358                 }
 359                 if (irqnr < 16) {
 360                         gic_write_eoir(irqnr);
 361                         if (static_key_true(&supports_deactivate))
 362                                 gic_write_dir(irqnr);
 363 #ifdef CONFIG_SMP
 364                         handle_IPI(irqnr, regs);
 365 #else
 366                         WARN_ONCE(true, "Unexpected SGI received!\n");
 367 #endif
 368                         continue;
 369                 }
 370         } while (irqnr != ICC_IAR1_EL1_SPURIOUS);
 371 }
 372
 373 static void __init gic_dist_init(void)
 374 {
 375         unsigned int i;
 376         u64 affinity;
 377         void __iomem *base = gic_data.dist_base;
 378
 379         /* Disable the distributor */
 380         writel_relaxed(0, base + GICD_CTLR);
 381         gic_dist_wait_for_rwp();
 382
 383         gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp);
 384
 385         /* Enable distributor with ARE, Group1 */
 386         writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1,
 387                        base + GICD_CTLR);
 388
 389         /*
 390          * Set all global interrupts to the boot CPU only. ARE must be
 391          * enabled.
 392          */
 393         affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
 394         for (i = 32; i < gic_data.irq_nr; i++)
 395                 writeq_relaxed(affinity, base + GICD_IROUTER + i * 8);
 396 }
 397
 398 static int gic_populate_rdist(void)
 399 {
 400         u64 mpidr = cpu_logical_map(smp_processor_id());
 401         u64 typer;
 402         u32 aff;
 403         int i;
 404
 405         /*
 406          * Convert affinity to a 32bit value that can be matched to
 407          * GICR_TYPER bits [63:32].
 408          */
 409         aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
 410                MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 411                MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
 412                MPIDR_AFFINITY_LEVEL(mpidr, 0));
 413
 414         for (i = 0; i < gic_data.nr_redist_regions; i++) {
 415                 void __iomem *ptr = gic_data.redist_regions[i].redist_base;
 416                 u32 reg;
 417
 418                 reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
 419                 if (reg != GIC_PIDR2_ARCH_GICv3 &&
 420                     reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */
 421                         pr_warn("No redistributor present @%p\n", ptr);
 422                         break;
 423                 }
 424
 425                 do {
 426                         typer = readq_relaxed(ptr + GICR_TYPER);
 427                         if ((typer >> 32) == aff) {
 428                                 u64 offset = ptr - gic_data.redist_regions[i].redist_base;
 429                                 gic_data_rdist_rd_base() = ptr;
 430                                 gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset;
 431                                 pr_info("CPU%d: found redistributor %llx region %d:%pa\n",
 432                                         smp_processor_id(),
 433                                         (unsigned long long)mpidr,
 434                                         i, &gic_data_rdist()->phys_base);
 435                                 return 0;
 436                         }
 437
 438                         if (gic_data.redist_stride) {
 439                                 ptr += gic_data.redist_stride;
 440                         } else {
 441                                 ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
 442                                 if (typer & GICR_TYPER_VLPIS)
 443                                         ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
 444                         }
 445                 } while (!(typer & GICR_TYPER_LAST));
 446         }
 447
 448         /* We couldn't even deal with ourselves... */
 449         WARN(true, "CPU%d: mpidr %llx has no re-distributor!\n",
 450              smp_processor_id(), (unsigned long long)mpidr);
 451         return -ENODEV;
 452 }
 453
 454 static void gic_cpu_sys_reg_init(void)
 455 {
 456         /*
 457          * Need to check that the SRE bit has actually been set. If
 458          * not, it means that SRE is disabled at EL2. We're going to
 459          * die painfully, and there is nothing we can do about it.
 460          *
 461          * Kindly inform the luser.
 462          */
 463         if (!gic_enable_sre())
 464                 pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
 465
 466         /* Set priority mask register */
 467         gic_write_pmr(DEFAULT_PMR_VALUE);
 468
 469         if (static_key_true(&supports_deactivate)) {
 470                 /* EOI drops priority only (mode 1) */
 471                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop);
 472         } else {
 473                 /* EOI deactivates interrupt too (mode 0) */
 474                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
 475         }
 476
 477         /* ... and let's hit the road... */
 478         gic_write_grpen1(1);
 479 }
 480
 481 static int gic_dist_supports_lpis(void)
 482 {
 483         return !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS);
 484 }
 485
 486 static void gic_cpu_init(void)
 487 {
 488         void __iomem *rbase;
 489
 490         /* Register ourselves with the rest of the world */
 491         if (gic_populate_rdist())
 492                 return;
 493
 494         gic_enable_redist(true);
 495
 496         rbase = gic_data_rdist_sgi_base();
 497
 498         gic_cpu_config(rbase, gic_redist_wait_for_rwp);
 499
 500         /* Give LPIs a spin */
 501         if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
 502                 its_cpu_init();
 503
 504         /* initialise system registers */
 505         gic_cpu_sys_reg_init();
 506 }
 507
 508 #ifdef CONFIG_SMP
 509 static int gic_secondary_init(struct notifier_block *nfb,
 510                               unsigned long action, void *hcpu)
 511 {
 512         if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
 513                 gic_cpu_init();
 514         return NOTIFY_OK;
 515 }
 516
 517 /*
 518  * Notifier for enabling the GIC CPU interface. Set an arbitrarily high
 519  * priority because the GIC needs to be up before the ARM generic timers.
 520  */
 521 static struct notifier_block gic_cpu_notifier = {
 522         .notifier_call = gic_secondary_init,
 523         .priority = 100,
 524 };
 525
 526 static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask,
 527                                    u64 cluster_id)
 528 {
 529         int cpu = *base_cpu;
 530         u64 mpidr = cpu_logical_map(cpu);
 531         u16 tlist = 0;
 532
 533         while (cpu < nr_cpu_ids) {
 534                 /*
 535                  * If we ever get a cluster of more than 16 CPUs, just
 536                  * scream and skip that CPU.
 537                  */
 538                 if (WARN_ON((mpidr & 0xff) >= 16))
 539                         goto out;
 540
 541                 tlist |= 1 << (mpidr & 0xf);
 542
 543                 cpu = cpumask_next(cpu, mask);
 544                 if (cpu >= nr_cpu_ids)
 545                         goto out;
 546
 547                 mpidr = cpu_logical_map(cpu);
 548
 549                 if (cluster_id != (mpidr & ~0xffUL)) {
 550                         cpu--;
 551                         goto out;
 552                 }
 553         }
 554 out:
 555         *base_cpu = cpu;
 556         return tlist;
 557 }
 558
 559 #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
 560         (MPIDR_AFFINITY_LEVEL(cluster_id, level) \
 561                 << ICC_SGI1R_AFFINITY_## level ##_SHIFT)
 562
 563 static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
 564 {
 565         u64 val;
 566
 567         val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3)     |
 568                MPIDR_TO_SGI_AFFINITY(cluster_id, 2)     |
 569                irq << ICC_SGI1R_SGI_ID_SHIFT            |
 570                MPIDR_TO_SGI_AFFINITY(cluster_id, 1)     |
 571                tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
 572
 573         pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
 574         gic_write_sgi1r(val);
 575 }
 576
 577 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 578 {
 579         int cpu;
 580
 581         if (WARN_ON(irq >= 16))
 582                 return;
 583
 584         /*
 585          * Ensure that stores to Normal memory are visible to the
 586          * other CPUs before issuing the IPI.
 587          */
 588         smp_wmb();
 589
 590         for_each_cpu(cpu, mask) {
 591                 u64 cluster_id = cpu_logical_map(cpu) & ~0xffUL;
 592                 u16 tlist;
 593
 594                 tlist = gic_compute_target_list(&cpu, mask, cluster_id);
 595                 gic_send_sgi(cluster_id, tlist, irq);
 596         }
 597
 598         /* Force the above writes to ICC_SGI1R_EL1 to be executed */
 599         isb();
 600 }
 601
 602 static void gic_smp_init(void)
 603 {
 604         set_smp_cross_call(gic_raise_softirq);
 605         register_cpu_notifier(&gic_cpu_notifier);
 606 }
 607
 608 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 609                             bool force)
 610 {
 611         unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
 612         void __iomem *reg;
 613         int enabled;
 614         u64 val;
 615
 616         if (gic_irq_in_rdist(d))
 617                 return -EINVAL;
 618
 619         /* If interrupt was enabled, disable it first */
 620         enabled = gic_peek_irq(d, GICD_ISENABLER);
 621         if (enabled)
 622                 gic_mask_irq(d);
 623
 624         reg = gic_dist_base(d) + GICD_IROUTER + (gic_irq(d) * 8);
 625         val = gic_mpidr_to_affinity(cpu_logical_map(cpu));
 626
 627         writeq_relaxed(val, reg);
 628
 629         /*
 630          * If the interrupt was enabled, enabled it again. Otherwise,
 631          * just wait for the distributor to have digested our changes.
 632          */
 633         if (enabled)
 634                 gic_unmask_irq(d);
 635         else
 636                 gic_dist_wait_for_rwp();
 637
 638         return IRQ_SET_MASK_OK;
 639 }
 640 #else
 641 #define gic_set_affinity        NULL
 642 #define gic_smp_init()          do { } while(0)
 643 #endif
 644
 645 #ifdef CONFIG_CPU_PM
 646 static int gic_cpu_pm_notifier(struct notifier_block *self,
 647                                unsigned long cmd, void *v)
 648 {
 649         if (cmd == CPU_PM_EXIT) {
 650                 gic_enable_redist(true);
 651                 gic_cpu_sys_reg_init();
 652         } else if (cmd == CPU_PM_ENTER) {
 653                 gic_write_grpen1(0);
 654                 gic_enable_redist(false);
 655         }
 656         return NOTIFY_OK;
 657 }
 658
 659 static struct notifier_block gic_cpu_pm_notifier_block = {
 660         .notifier_call = gic_cpu_pm_notifier,
 661 };
 662
 663 static void gic_cpu_pm_init(void)
 664 {
 665         cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
 666 }
 667
 668 #else
 669 static inline void gic_cpu_pm_init(void) { }
 670 #endif /* CONFIG_CPU_PM */
 671
 672 static struct irq_chip gic_chip = {
 673         .name                   = "GICv3",
 674         .irq_mask               = gic_mask_irq,
 675         .irq_unmask             = gic_unmask_irq,
 676         .irq_eoi                = gic_eoi_irq,
 677         .irq_set_type           = gic_set_type,
 678         .irq_set_affinity       = gic_set_affinity,
 679         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
 680         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 681         .flags                  = IRQCHIP_SET_TYPE_MASKED,
 682 };
 683
 684 static struct irq_chip gic_eoimode1_chip = {
 685         .name                   = "GICv3",
 686         .irq_mask               = gic_eoimode1_mask_irq,
 687         .irq_unmask             = gic_unmask_irq,
 688         .irq_eoi                = gic_eoimode1_eoi_irq,
 689         .irq_set_type           = gic_set_type,
 690         .irq_set_affinity       = gic_set_affinity,
 691         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
 692         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 693         .irq_set_vcpu_affinity  = gic_irq_set_vcpu_affinity,
 694         .flags                  = IRQCHIP_SET_TYPE_MASKED,
 695 };
 696
 697 #define GIC_ID_NR               (1U << gic_data.rdists.id_bits)
 698
 699 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
 700                               irq_hw_number_t hw)
 701 {
 702         struct irq_chip *chip = &gic_chip;
 703
 704         if (static_key_true(&supports_deactivate))
 705                 chip = &gic_eoimode1_chip;
 706
 707         /* SGIs are private to the core kernel */
 708         if (hw < 16)
 709                 return -EPERM;
 710         /* Nothing here */
 711         if (hw >= gic_data.irq_nr && hw < 8192)
 712                 return -EPERM;
 713         /* Off limits */
 714         if (hw >= GIC_ID_NR)
 715                 return -EPERM;
 716
 717         /* PPIs */
 718         if (hw < 32) {
 719                 irq_set_percpu_devid(irq);
 720                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 721                                     handle_percpu_devid_irq, NULL, NULL);
 722                 irq_set_status_flags(irq, IRQ_NOAUTOEN);
 723         }
 724         /* SPIs */
 725         if (hw >= 32 && hw < gic_data.irq_nr) {
 726                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 727                                     handle_fasteoi_irq, NULL, NULL);
 728                 irq_set_probe(irq);
 729         }
 730         /* LPIs */
 731         if (hw >= 8192 && hw < GIC_ID_NR) {
 732                 if (!gic_dist_supports_lpis())
 733                         return -EPERM;
 734                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 735                                     handle_fasteoi_irq, NULL, NULL);
 736         }
 737
 738         return 0;
 739 }
 740
 741 static int gic_irq_domain_xlate(struct irq_domain *d,
 742                                 struct device_node *controller,
 743                                 const u32 *intspec, unsigned int intsize,
 744                                 unsigned long *out_hwirq, unsigned int *out_type)
 745 {
 746         if (d->of_node != controller)
 747                 return -EINVAL;
 748         if (intsize < 3)
 749                 return -EINVAL;
 750
 751         switch(intspec[0]) {
 752         case 0:                 /* SPI */
 753                 *out_hwirq = intspec[1] + 32;
 754                 break;
 755         case 1:                 /* PPI */
 756                 *out_hwirq = intspec[1] + 16;
 757                 break;
 758         case GIC_IRQ_TYPE_LPI:  /* LPI */
 759                 *out_hwirq = intspec[1];
 760                 break;
 761         default:
 762                 return -EINVAL;
 763         }
 764
 765         *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
 766         return 0;
 767 }
 768
 769 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 770                                 unsigned int nr_irqs, void *arg)
 771 {
 772         int i, ret;
 773         irq_hw_number_t hwirq;
 774         unsigned int type = IRQ_TYPE_NONE;
 775         struct of_phandle_args *irq_data = arg;
 776
 777         ret = gic_irq_domain_xlate(domain, irq_data->np, irq_data->args,
 778                                    irq_data->args_count, &hwirq, &type);
 779         if (ret)
 780                 return ret;
 781
 782         for (i = 0; i < nr_irqs; i++)
 783                 gic_irq_domain_map(domain, virq + i, hwirq + i);
 784
 785         return 0;
 786 }
 787
 788 static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
 789                                 unsigned int nr_irqs)
 790 {
 791         int i;
 792
 793         for (i = 0; i < nr_irqs; i++) {
 794                 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
 795                 irq_set_handler(virq + i, NULL);
 796                 irq_domain_reset_irq_data(d);
 797         }
 798 }
 799
 800 static const struct irq_domain_ops gic_irq_domain_ops = {
 801         .xlate = gic_irq_domain_xlate,
 802         .alloc = gic_irq_domain_alloc,
 803         .free = gic_irq_domain_free,
 804 };
 805
 806 static void gicv3_enable_quirks(void)
 807 {
 808 #ifdef CONFIG_ARM64
 809         if (cpus_have_cap(ARM64_WORKAROUND_CAVIUM_23154))
 810                 static_branch_enable(&is_cavium_thunderx);
 811 #endif
 812 }
 813
 814 static int __init gic_of_init(struct device_node *node, struct device_node *parent)
 815 {
 816         void __iomem *dist_base;
 817         struct redist_region *rdist_regs;
 818         u64 redist_stride;
 819         u32 nr_redist_regions;
 820         u32 typer;
 821         u32 reg;
 822         int gic_irqs;
 823         int err;
 824         int i;
 825
 826         dist_base = of_iomap(node, 0);
 827         if (!dist_base) {
 828                 pr_err("%s: unable to map gic dist registers\n",
 829                         node->full_name);
 830                 return -ENXIO;
 831         }
 832
 833         reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
 834         if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4) {
 835                 pr_err("%s: no distributor detected, giving up\n",
 836                         node->full_name);
 837                 err = -ENODEV;
 838                 goto out_unmap_dist;
 839         }
 840
 841         if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
 842                 nr_redist_regions = 1;
 843
 844         rdist_regs = kzalloc(sizeof(*rdist_regs) * nr_redist_regions, GFP_KERNEL);
 845         if (!rdist_regs) {
 846                 err = -ENOMEM;
 847                 goto out_unmap_dist;
 848         }
 849
 850         for (i = 0; i < nr_redist_regions; i++) {
 851                 struct resource res;
 852                 int ret;
 853
 854                 ret = of_address_to_resource(node, 1 + i, &res);
 855                 rdist_regs[i].redist_base = of_iomap(node, 1 + i);
 856                 if (ret || !rdist_regs[i].redist_base) {
 857                         pr_err("%s: couldn't map region %d\n",
 858                                node->full_name, i);
 859                         err = -ENODEV;
 860                         goto out_unmap_rdist;
 861                 }
 862                 rdist_regs[i].phys_base = res.start;
 863         }
 864
 865         if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
 866                 redist_stride = 0;
 867
 868         if (!is_hyp_mode_available())
 869                 static_key_slow_dec(&supports_deactivate);
 870
 871         if (static_key_true(&supports_deactivate))
 872                 pr_info("GIC: Using split EOI/Deactivate mode\n");
 873
 874         gic_data.dist_base = dist_base;
 875         gic_data.redist_regions = rdist_regs;
 876         gic_data.nr_redist_regions = nr_redist_regions;
 877         gic_data.redist_stride = redist_stride;
 878
 879         gicv3_enable_quirks();
 880
 881         /*
 882          * Find out how many interrupts are supported.
 883          * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
 884          */
 885         typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
 886         gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer);
 887         gic_irqs = GICD_TYPER_IRQS(typer);
 888         if (gic_irqs > 1020)
 889                 gic_irqs = 1020;
 890         gic_data.irq_nr = gic_irqs;
 891
 892         gic_data.domain = irq_domain_add_tree(node, &gic_irq_domain_ops,
 893                                               &gic_data);
 894         gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
 895
 896         if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
 897                 err = -ENOMEM;
 898                 goto out_free;
 899         }
 900
 901         set_handle_irq(gic_handle_irq);
 902
 903         if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
 904                 its_init(node, &gic_data.rdists, gic_data.domain);
 905
 906         gic_smp_init();
 907         gic_dist_init();
 908         gic_cpu_init();
 909         gic_cpu_pm_init();
 910
 911         return 0;
 912
 913 out_free:
 914         if (gic_data.domain)
 915                 irq_domain_remove(gic_data.domain);
 916         free_percpu(gic_data.rdists.rdist);
 917 out_unmap_rdist:
 918         for (i = 0; i < nr_redist_regions; i++)
 919                 if (rdist_regs[i].redist_base)
 920                         iounmap(rdist_regs[i].redist_base);
 921         kfree(rdist_regs);
 922 out_unmap_dist:
 923         iounmap(dist_base);
 924         return err;
 925 }
 926
 927 IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);