kernel/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(unsigned long mpidr)
 323 {
 324         u64 aff;
 325
 326         aff = ((u64)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         u32 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                         /*
 365                          * Unlike GICv2, we don't need an smp_rmb() here.
 366                          * The control dependency from gic_read_iar to
 367                          * the ISB in gic_write_eoir is enough to ensure
 368                          * that any shared data read by handle_IPI will
 369                          * be read after the ACK.
 370                          */
 371                         handle_IPI(irqnr, regs);
 372 #else
 373                         WARN_ONCE(true, "Unexpected SGI received!\n");
 374 #endif
 375                         continue;
 376                 }
 377         } while (irqnr != ICC_IAR1_EL1_SPURIOUS);
 378 }
 379
 380 static void __init gic_dist_init(void)
 381 {
 382         unsigned int i;
 383         u64 affinity;
 384         void __iomem *base = gic_data.dist_base;
 385
 386         /* Disable the distributor */
 387         writel_relaxed(0, base + GICD_CTLR);
 388         gic_dist_wait_for_rwp();
 389
 390         /*
 391          * Configure SPIs as non-secure Group-1. This will only matter
 392          * if the GIC only has a single security state. This will not
 393          * do the right thing if the kernel is running in secure mode,
 394          * but that's not the intended use case anyway.
 395          */
 396         for (i = 32; i < gic_data.irq_nr; i += 32)
 397                 writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
 398
 399         gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp);
 400
 401         /* Enable distributor with ARE, Group1 */
 402         writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1,
 403                        base + GICD_CTLR);
 404
 405         /*
 406          * Set all global interrupts to the boot CPU only. ARE must be
 407          * enabled.
 408          */
 409         affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
 410         for (i = 32; i < gic_data.irq_nr; i++)
 411                 gic_write_irouter(affinity, base + GICD_IROUTER + i * 8);
 412 }
 413
 414 static int gic_populate_rdist(void)
 415 {
 416         unsigned long mpidr = cpu_logical_map(smp_processor_id());
 417         u64 typer;
 418         u32 aff;
 419         int i;
 420
 421         /*
 422          * Convert affinity to a 32bit value that can be matched to
 423          * GICR_TYPER bits [63:32].
 424          */
 425         aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
 426                MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 427                MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
 428                MPIDR_AFFINITY_LEVEL(mpidr, 0));
 429
 430         for (i = 0; i < gic_data.nr_redist_regions; i++) {
 431                 void __iomem *ptr = gic_data.redist_regions[i].redist_base;
 432                 u32 reg;
 433
 434                 reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
 435                 if (reg != GIC_PIDR2_ARCH_GICv3 &&
 436                     reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */
 437                         pr_warn("No redistributor present @%p\n", ptr);
 438                         break;
 439                 }
 440
 441                 do {
 442                         typer = gic_read_typer(ptr + GICR_TYPER);
 443                         if ((typer >> 32) == aff) {
 444                                 u64 offset = ptr - gic_data.redist_regions[i].redist_base;
 445                                 gic_data_rdist_rd_base() = ptr;
 446                                 gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset;
 447                                 pr_info("CPU%d: found redistributor %lx region %d:%pa\n",
 448                                         smp_processor_id(), mpidr, i,
 449                                         &gic_data_rdist()->phys_base);
 450                                 return 0;
 451                         }
 452
 453                         if (gic_data.redist_stride) {
 454                                 ptr += gic_data.redist_stride;
 455                         } else {
 456                                 ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
 457                                 if (typer & GICR_TYPER_VLPIS)
 458                                         ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
 459                         }
 460                 } while (!(typer & GICR_TYPER_LAST));
 461         }
 462
 463         /* We couldn't even deal with ourselves... */
 464         WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n",
 465              smp_processor_id(), mpidr);
 466         return -ENODEV;
 467 }
 468
 469 static void gic_cpu_sys_reg_init(void)
 470 {
 471         /*
 472          * Need to check that the SRE bit has actually been set. If
 473          * not, it means that SRE is disabled at EL2. We're going to
 474          * die painfully, and there is nothing we can do about it.
 475          *
 476          * Kindly inform the luser.
 477          */
 478         if (!gic_enable_sre())
 479                 pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
 480
 481         /* Set priority mask register */
 482         gic_write_pmr(DEFAULT_PMR_VALUE);
 483
 484         if (static_key_true(&supports_deactivate)) {
 485                 /* EOI drops priority only (mode 1) */
 486                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop);
 487         } else {
 488                 /* EOI deactivates interrupt too (mode 0) */
 489                 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
 490         }
 491
 492         /* ... and let's hit the road... */
 493         gic_write_grpen1(1);
 494 }
 495
 496 static int gic_dist_supports_lpis(void)
 497 {
 498         return !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS);
 499 }
 500
 501 static void gic_cpu_init(void)
 502 {
 503         void __iomem *rbase;
 504
 505         /* Register ourselves with the rest of the world */
 506         if (gic_populate_rdist())
 507                 return;
 508
 509         gic_enable_redist(true);
 510
 511         rbase = gic_data_rdist_sgi_base();
 512
 513         /* Configure SGIs/PPIs as non-secure Group-1 */
 514         writel_relaxed(~0, rbase + GICR_IGROUPR0);
 515
 516         gic_cpu_config(rbase, gic_redist_wait_for_rwp);
 517
 518         /* Give LPIs a spin */
 519         if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
 520                 its_cpu_init();
 521
 522         /* initialise system registers */
 523         gic_cpu_sys_reg_init();
 524 }
 525
 526 #ifdef CONFIG_SMP
 527 static int gic_secondary_init(struct notifier_block *nfb,
 528                               unsigned long action, void *hcpu)
 529 {
 530         if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
 531                 gic_cpu_init();
 532         return NOTIFY_OK;
 533 }
 534
 535 /*
 536  * Notifier for enabling the GIC CPU interface. Set an arbitrarily high
 537  * priority because the GIC needs to be up before the ARM generic timers.
 538  */
 539 static struct notifier_block gic_cpu_notifier = {
 540         .notifier_call = gic_secondary_init,
 541         .priority = 100,
 542 };
 543
 544 static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask,
 545                                    unsigned long cluster_id)
 546 {
 547         int next_cpu, cpu = *base_cpu;
 548         unsigned long mpidr = cpu_logical_map(cpu);
 549         u16 tlist = 0;
 550
 551         while (cpu < nr_cpu_ids) {
 552                 /*
 553                  * If we ever get a cluster of more than 16 CPUs, just
 554                  * scream and skip that CPU.
 555                  */
 556                 if (WARN_ON((mpidr & 0xff) >= 16))
 557                         goto out;
 558
 559                 tlist |= 1 << (mpidr & 0xf);
 560
 561                 next_cpu = cpumask_next(cpu, mask);
 562                 if (next_cpu >= nr_cpu_ids)
 563                         goto out;
 564                 cpu = next_cpu;
 565
 566                 mpidr = cpu_logical_map(cpu);
 567
 568                 if (cluster_id != (mpidr & ~0xffUL)) {
 569                         cpu--;
 570                         goto out;
 571                 }
 572         }
 573 out:
 574         *base_cpu = cpu;
 575         return tlist;
 576 }
 577
 578 #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
 579         (MPIDR_AFFINITY_LEVEL(cluster_id, level) \
 580                 << ICC_SGI1R_AFFINITY_## level ##_SHIFT)
 581
 582 static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
 583 {
 584         u64 val;
 585
 586         val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3)     |
 587                MPIDR_TO_SGI_AFFINITY(cluster_id, 2)     |
 588                irq << ICC_SGI1R_SGI_ID_SHIFT            |
 589                MPIDR_TO_SGI_AFFINITY(cluster_id, 1)     |
 590                tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
 591
 592         pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
 593         gic_write_sgi1r(val);
 594 }
 595
 596 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 597 {
 598         int cpu;
 599
 600         if (WARN_ON(irq >= 16))
 601                 return;
 602
 603         /*
 604          * Ensure that stores to Normal memory are visible to the
 605          * other CPUs before issuing the IPI.
 606          */
 607         smp_wmb();
 608
 609         for_each_cpu(cpu, mask) {
 610                 unsigned long cluster_id = cpu_logical_map(cpu) & ~0xffUL;
 611                 u16 tlist;
 612
 613                 tlist = gic_compute_target_list(&cpu, mask, cluster_id);
 614                 gic_send_sgi(cluster_id, tlist, irq);
 615         }
 616
 617         /* Force the above writes to ICC_SGI1R_EL1 to be executed */
 618         isb();
 619 }
 620
 621 static void gic_smp_init(void)
 622 {
 623         set_smp_cross_call(gic_raise_softirq);
 624         register_cpu_notifier(&gic_cpu_notifier);
 625 }
 626
 627 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 628                             bool force)
 629 {
 630         unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
 631         void __iomem *reg;
 632         int enabled;
 633         u64 val;
 634
 635         if (gic_irq_in_rdist(d))
 636                 return -EINVAL;
 637
 638         /* If interrupt was enabled, disable it first */
 639         enabled = gic_peek_irq(d, GICD_ISENABLER);
 640         if (enabled)
 641                 gic_mask_irq(d);
 642
 643         reg = gic_dist_base(d) + GICD_IROUTER + (gic_irq(d) * 8);
 644         val = gic_mpidr_to_affinity(cpu_logical_map(cpu));
 645
 646         gic_write_irouter(val, reg);
 647
 648         /*
 649          * If the interrupt was enabled, enabled it again. Otherwise,
 650          * just wait for the distributor to have digested our changes.
 651          */
 652         if (enabled)
 653                 gic_unmask_irq(d);
 654         else
 655                 gic_dist_wait_for_rwp();
 656
 657         return IRQ_SET_MASK_OK;
 658 }
 659 #else
 660 #define gic_set_affinity        NULL
 661 #define gic_smp_init()          do { } while(0)
 662 #endif
 663
 664 #ifdef CONFIG_CPU_PM
 665 static int gic_cpu_pm_notifier(struct notifier_block *self,
 666                                unsigned long cmd, void *v)
 667 {
 668         if (cmd == CPU_PM_EXIT) {
 669                 gic_enable_redist(true);
 670                 gic_cpu_sys_reg_init();
 671         } else if (cmd == CPU_PM_ENTER) {
 672                 gic_write_grpen1(0);
 673                 gic_enable_redist(false);
 674         }
 675         return NOTIFY_OK;
 676 }
 677
 678 static struct notifier_block gic_cpu_pm_notifier_block = {
 679         .notifier_call = gic_cpu_pm_notifier,
 680 };
 681
 682 static void gic_cpu_pm_init(void)
 683 {
 684         cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
 685 }
 686
 687 #else
 688 static inline void gic_cpu_pm_init(void) { }
 689 #endif /* CONFIG_CPU_PM */
 690
 691 static struct irq_chip gic_chip = {
 692         .name                   = "GICv3",
 693         .irq_mask               = gic_mask_irq,
 694         .irq_unmask             = gic_unmask_irq,
 695         .irq_eoi                = gic_eoi_irq,
 696         .irq_set_type           = gic_set_type,
 697         .irq_set_affinity       = gic_set_affinity,
 698         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
 699         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 700         .flags                  = IRQCHIP_SET_TYPE_MASKED,
 701 };
 702
 703 static struct irq_chip gic_eoimode1_chip = {
 704         .name                   = "GICv3",
 705         .irq_mask               = gic_eoimode1_mask_irq,
 706         .irq_unmask             = gic_unmask_irq,
 707         .irq_eoi                = gic_eoimode1_eoi_irq,
 708         .irq_set_type           = gic_set_type,
 709         .irq_set_affinity       = gic_set_affinity,
 710         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
 711         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 712         .irq_set_vcpu_affinity  = gic_irq_set_vcpu_affinity,
 713         .flags                  = IRQCHIP_SET_TYPE_MASKED,
 714 };
 715
 716 #define GIC_ID_NR               (1U << gic_data.rdists.id_bits)
 717
 718 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
 719                               irq_hw_number_t hw)
 720 {
 721         struct irq_chip *chip = &gic_chip;
 722
 723         if (static_key_true(&supports_deactivate))
 724                 chip = &gic_eoimode1_chip;
 725
 726         /* SGIs are private to the core kernel */
 727         if (hw < 16)
 728                 return -EPERM;
 729         /* Nothing here */
 730         if (hw >= gic_data.irq_nr && hw < 8192)
 731                 return -EPERM;
 732         /* Off limits */
 733         if (hw >= GIC_ID_NR)
 734                 return -EPERM;
 735
 736         /* PPIs */
 737         if (hw < 32) {
 738                 irq_set_percpu_devid(irq);
 739                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 740                                     handle_percpu_devid_irq, NULL, NULL);
 741                 irq_set_status_flags(irq, IRQ_NOAUTOEN);
 742         }
 743         /* SPIs */
 744         if (hw >= 32 && hw < gic_data.irq_nr) {
 745                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 746                                     handle_fasteoi_irq, NULL, NULL);
 747                 irq_set_probe(irq);
 748         }
 749         /* LPIs */
 750         if (hw >= 8192 && hw < GIC_ID_NR) {
 751                 if (!gic_dist_supports_lpis())
 752                         return -EPERM;
 753                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 754                                     handle_fasteoi_irq, NULL, NULL);
 755         }
 756
 757         return 0;
 758 }
 759
 760 static int gic_irq_domain_translate(struct irq_domain *d,
 761                                     struct irq_fwspec *fwspec,
 762                                     unsigned long *hwirq,
 763                                     unsigned int *type)
 764 {
 765         if (is_of_node(fwspec->fwnode)) {
 766                 if (fwspec->param_count < 3)
 767                         return -EINVAL;
 768
 769                 switch (fwspec->param[0]) {
 770                 case 0:                 /* SPI */
 771                         *hwirq = fwspec->param[1] + 32;
 772                         break;
 773                 case 1:                 /* PPI */
 774                         *hwirq = fwspec->param[1] + 16;
 775                         break;
 776                 case GIC_IRQ_TYPE_LPI:  /* LPI */
 777                         *hwirq = fwspec->param[1];
 778                         break;
 779                 default:
 780                         return -EINVAL;
 781                 }
 782
 783                 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
 784                 return 0;
 785         }
 786
 787         return -EINVAL;
 788 }
 789
 790 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 791                                 unsigned int nr_irqs, void *arg)
 792 {
 793         int i, ret;
 794         irq_hw_number_t hwirq;
 795         unsigned int type = IRQ_TYPE_NONE;
 796         struct irq_fwspec *fwspec = arg;
 797
 798         ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
 799         if (ret)
 800                 return ret;
 801
 802         for (i = 0; i < nr_irqs; i++)
 803                 gic_irq_domain_map(domain, virq + i, hwirq + i);
 804
 805         return 0;
 806 }
 807
 808 static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
 809                                 unsigned int nr_irqs)
 810 {
 811         int i;
 812
 813         for (i = 0; i < nr_irqs; i++) {
 814                 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
 815                 irq_set_handler(virq + i, NULL);
 816                 irq_domain_reset_irq_data(d);
 817         }
 818 }
 819
 820 static const struct irq_domain_ops gic_irq_domain_ops = {
 821         .translate = gic_irq_domain_translate,
 822         .alloc = gic_irq_domain_alloc,
 823         .free = gic_irq_domain_free,
 824 };
 825
 826 static void gicv3_enable_quirks(void)
 827 {
 828 #ifdef CONFIG_ARM64
 829         if (cpus_have_cap(ARM64_WORKAROUND_CAVIUM_23154))
 830                 static_branch_enable(&is_cavium_thunderx);
 831 #endif
 832 }
 833
 834 static int __init gic_of_init(struct device_node *node, struct device_node *parent)
 835 {
 836         void __iomem *dist_base;
 837         struct redist_region *rdist_regs;
 838         u64 redist_stride;
 839         u32 nr_redist_regions;
 840         u32 typer;
 841         u32 reg;
 842         int gic_irqs;
 843         int err;
 844         int i;
 845
 846         dist_base = of_iomap(node, 0);
 847         if (!dist_base) {
 848                 pr_err("%s: unable to map gic dist registers\n",
 849                         node->full_name);
 850                 return -ENXIO;
 851         }
 852
 853         reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
 854         if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4) {
 855                 pr_err("%s: no distributor detected, giving up\n",
 856                         node->full_name);
 857                 err = -ENODEV;
 858                 goto out_unmap_dist;
 859         }
 860
 861         if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
 862                 nr_redist_regions = 1;
 863
 864         rdist_regs = kzalloc(sizeof(*rdist_regs) * nr_redist_regions, GFP_KERNEL);
 865         if (!rdist_regs) {
 866                 err = -ENOMEM;
 867                 goto out_unmap_dist;
 868         }
 869
 870         for (i = 0; i < nr_redist_regions; i++) {
 871                 struct resource res;
 872                 int ret;
 873
 874                 ret = of_address_to_resource(node, 1 + i, &res);
 875                 rdist_regs[i].redist_base = of_iomap(node, 1 + i);
 876                 if (ret || !rdist_regs[i].redist_base) {
 877                         pr_err("%s: couldn't map region %d\n",
 878                                node->full_name, i);
 879                         err = -ENODEV;
 880                         goto out_unmap_rdist;
 881                 }
 882                 rdist_regs[i].phys_base = res.start;
 883         }
 884
 885         if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
 886                 redist_stride = 0;
 887
 888         if (!is_hyp_mode_available())
 889                 static_key_slow_dec(&supports_deactivate);
 890
 891         if (static_key_true(&supports_deactivate))
 892                 pr_info("GIC: Using split EOI/Deactivate mode\n");
 893
 894         gic_data.dist_base = dist_base;
 895         gic_data.redist_regions = rdist_regs;
 896         gic_data.nr_redist_regions = nr_redist_regions;
 897         gic_data.redist_stride = redist_stride;
 898
 899         gicv3_enable_quirks();
 900
 901         /*
 902          * Find out how many interrupts are supported.
 903          * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
 904          */
 905         typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
 906         gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer);
 907         gic_irqs = GICD_TYPER_IRQS(typer);
 908         if (gic_irqs > 1020)
 909                 gic_irqs = 1020;
 910         gic_data.irq_nr = gic_irqs;
 911
 912         gic_data.domain = irq_domain_add_tree(node, &gic_irq_domain_ops,
 913                                               &gic_data);
 914         gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
 915
 916         if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
 917                 err = -ENOMEM;
 918                 goto out_free;
 919         }
 920
 921         set_handle_irq(gic_handle_irq);
 922
 923         if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
 924                 its_init(node, &gic_data.rdists, gic_data.domain);
 925
 926         gic_smp_init();
 927         gic_dist_init();
 928         gic_cpu_init();
 929         gic_cpu_pm_init();
 930
 931         return 0;
 932
 933 out_free:
 934         if (gic_data.domain)
 935                 irq_domain_remove(gic_data.domain);
 936         free_percpu(gic_data.rdists.rdist);
 937 out_unmap_rdist:
 938         for (i = 0; i < nr_redist_regions; i++)
 939                 if (rdist_regs[i].redist_base)
 940                         iounmap(rdist_regs[i].redist_base);
 941         kfree(rdist_regs);
 942 out_unmap_dist:
 943         iounmap(dist_base);
 944         return err;
 945 }
 946
 947 IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);