drivers/irqchip/irq-gic.c

   1 /*
   2  *  Copyright (C) 2002 ARM Limited, All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * Interrupt architecture for the GIC:
   9  *
  10  * o There is one Interrupt Distributor, which receives interrupts
  11  *   from system devices and sends them to the Interrupt Controllers.
  12  *
  13  * o There is one CPU Interface per CPU, which sends interrupts sent
  14  *   by the Distributor, and interrupts generated locally, to the
  15  *   associated CPU. The base address of the CPU interface is usually
  16  *   aliased so that the same address points to different chips depending
  17  *   on the CPU it is accessed from.
  18  *
  19  * Note that IRQs 0-31 are special - they are local to each CPU.
  20  * As such, the enable set/clear, pending set/clear and active bit
  21  * registers are banked per-cpu for these sources.
  22  */
  23 #include <linux/init.h>
  24 #include <linux/kernel.h>
  25 #include <linux/err.h>
  26 #include <linux/module.h>
  27 #include <linux/list.h>
  28 #include <linux/smp.h>
  29 #include <linux/cpu.h>
  30 #include <linux/cpu_pm.h>
  31 #include <linux/cpumask.h>
  32 #include <linux/io.h>
  33 #include <linux/of.h>
  34 #include <linux/of_address.h>
  35 #include <linux/of_irq.h>
  36 #include <linux/acpi.h>
  37 #include <linux/irqdomain.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/percpu.h>
  40 #include <linux/slab.h>
  41 #include <linux/irqchip.h>
  42 #include <linux/irqchip/chained_irq.h>
  43 #include <linux/irqchip/arm-gic.h>
  44
  45 #include <asm/cputype.h>
  46 #include <asm/irq.h>
  47 #include <asm/exception.h>
  48 #include <asm/smp_plat.h>
  49 #include <asm/virt.h>
  50
  51 #include "irq-gic-common.h"
  52
  53 #ifdef CONFIG_ARM64
  54 #include <asm/cpufeature.h>
  55
  56 static void gic_check_cpu_features(void)
  57 {
  58         WARN_TAINT_ONCE(this_cpu_has_cap(ARM64_HAS_SYSREG_GIC_CPUIF),
  59                         TAINT_CPU_OUT_OF_SPEC,
  60                         "GICv3 system registers enabled, broken firmware!\n");
  61 }
  62 #else
  63 #define gic_check_cpu_features()        do { } while(0)
  64 #endif
  65
  66 union gic_base {
  67         void __iomem *common_base;
  68         void __percpu * __iomem *percpu_base;
  69 };
  70
  71 struct gic_chip_data {
  72         struct irq_chip chip;
  73         union gic_base dist_base;
  74         union gic_base cpu_base;
  75         void __iomem *raw_dist_base;
  76         void __iomem *raw_cpu_base;
  77         u32 percpu_offset;
  78 #if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM)
  79         u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
  80         u32 saved_spi_active[DIV_ROUND_UP(1020, 32)];
  81         u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
  82         u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
  83         u32 __percpu *saved_ppi_enable;
  84         u32 __percpu *saved_ppi_active;
  85         u32 __percpu *saved_ppi_conf;
  86 #endif
  87         struct irq_domain *domain;
  88         unsigned int gic_irqs;
  89 #ifdef CONFIG_GIC_NON_BANKED
  90         void __iomem *(*get_base)(union gic_base *);
  91 #endif
  92 };
  93
  94 #ifdef CONFIG_BL_SWITCHER
  95
  96 static DEFINE_RAW_SPINLOCK(cpu_map_lock);
  97
  98 #define gic_lock_irqsave(f)             \
  99         raw_spin_lock_irqsave(&cpu_map_lock, (f))
 100 #define gic_unlock_irqrestore(f)        \
 101         raw_spin_unlock_irqrestore(&cpu_map_lock, (f))
 102
 103 #define gic_lock()                      raw_spin_lock(&cpu_map_lock)
 104 #define gic_unlock()                    raw_spin_unlock(&cpu_map_lock)
 105
 106 #else
 107
 108 #define gic_lock_irqsave(f)             do { (void)(f); } while(0)
 109 #define gic_unlock_irqrestore(f)        do { (void)(f); } while(0)
 110
 111 #define gic_lock()                      do { } while(0)
 112 #define gic_unlock()                    do { } while(0)
 113
 114 #endif
 115
 116 /*
 117  * The GIC mapping of CPU interfaces does not necessarily match
 118  * the logical CPU numbering.  Let's use a mapping as returned
 119  * by the GIC itself.
 120  */
 121 #define NR_GIC_CPU_IF 8
 122 static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
 123
 124 static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
 125
 126 static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly;
 127
 128 static struct gic_kvm_info gic_v2_kvm_info;
 129
 130 #ifdef CONFIG_GIC_NON_BANKED
 131 static void __iomem *gic_get_percpu_base(union gic_base *base)
 132 {
 133         return raw_cpu_read(*base->percpu_base);
 134 }
 135
 136 static void __iomem *gic_get_common_base(union gic_base *base)
 137 {
 138         return base->common_base;
 139 }
 140
 141 static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
 142 {
 143         return data->get_base(&data->dist_base);
 144 }
 145
 146 static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
 147 {
 148         return data->get_base(&data->cpu_base);
 149 }
 150
 151 static inline void gic_set_base_accessor(struct gic_chip_data *data,
 152                                          void __iomem *(*f)(union gic_base *))
 153 {
 154         data->get_base = f;
 155 }
 156 #else
 157 #define gic_data_dist_base(d)   ((d)->dist_base.common_base)
 158 #define gic_data_cpu_base(d)    ((d)->cpu_base.common_base)
 159 #define gic_set_base_accessor(d, f)
 160 #endif
 161
 162 static inline void __iomem *gic_dist_base(struct irq_data *d)
 163 {
 164         struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
 165         return gic_data_dist_base(gic_data);
 166 }
 167
 168 static inline void __iomem *gic_cpu_base(struct irq_data *d)
 169 {
 170         struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
 171         return gic_data_cpu_base(gic_data);
 172 }
 173
 174 static inline unsigned int gic_irq(struct irq_data *d)
 175 {
 176         return d->hwirq;
 177 }
 178
 179 static inline bool cascading_gic_irq(struct irq_data *d)
 180 {
 181         void *data = irq_data_get_irq_handler_data(d);
 182
 183         /*
 184          * If handler_data is set, this is a cascading interrupt, and
 185          * it cannot possibly be forwarded.
 186          */
 187         return data != NULL;
 188 }
 189
 190 /*
 191  * Routines to acknowledge, disable and enable interrupts
 192  */
 193 static void gic_poke_irq(struct irq_data *d, u32 offset)
 194 {
 195         u32 mask = 1 << (gic_irq(d) % 32);
 196         writel_relaxed(mask, gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4);
 197 }
 198
 199 static int gic_peek_irq(struct irq_data *d, u32 offset)
 200 {
 201         u32 mask = 1 << (gic_irq(d) % 32);
 202         return !!(readl_relaxed(gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4) & mask);
 203 }
 204
 205 static void gic_mask_irq(struct irq_data *d)
 206 {
 207         gic_poke_irq(d, GIC_DIST_ENABLE_CLEAR);
 208 }
 209
 210 static void gic_eoimode1_mask_irq(struct irq_data *d)
 211 {
 212         gic_mask_irq(d);
 213         /*
 214          * When masking a forwarded interrupt, make sure it is
 215          * deactivated as well.
 216          *
 217          * This ensures that an interrupt that is getting
 218          * disabled/masked will not get "stuck", because there is
 219          * noone to deactivate it (guest is being terminated).
 220          */
 221         if (irqd_is_forwarded_to_vcpu(d))
 222                 gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR);
 223 }
 224
 225 static void gic_unmask_irq(struct irq_data *d)
 226 {
 227         gic_poke_irq(d, GIC_DIST_ENABLE_SET);
 228 }
 229
 230 static void gic_eoi_irq(struct irq_data *d)
 231 {
 232         writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
 233 }
 234
 235 static void gic_eoimode1_eoi_irq(struct irq_data *d)
 236 {
 237         /* Do not deactivate an IRQ forwarded to a vcpu. */
 238         if (irqd_is_forwarded_to_vcpu(d))
 239                 return;
 240
 241         writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
 242 }
 243
 244 static int gic_irq_set_irqchip_state(struct irq_data *d,
 245                                      enum irqchip_irq_state which, bool val)
 246 {
 247         u32 reg;
 248
 249         switch (which) {
 250         case IRQCHIP_STATE_PENDING:
 251                 reg = val ? GIC_DIST_PENDING_SET : GIC_DIST_PENDING_CLEAR;
 252                 break;
 253
 254         case IRQCHIP_STATE_ACTIVE:
 255                 reg = val ? GIC_DIST_ACTIVE_SET : GIC_DIST_ACTIVE_CLEAR;
 256                 break;
 257
 258         case IRQCHIP_STATE_MASKED:
 259                 reg = val ? GIC_DIST_ENABLE_CLEAR : GIC_DIST_ENABLE_SET;
 260                 break;
 261
 262         default:
 263                 return -EINVAL;
 264         }
 265
 266         gic_poke_irq(d, reg);
 267         return 0;
 268 }
 269
 270 static int gic_irq_get_irqchip_state(struct irq_data *d,
 271                                       enum irqchip_irq_state which, bool *val)
 272 {
 273         switch (which) {
 274         case IRQCHIP_STATE_PENDING:
 275                 *val = gic_peek_irq(d, GIC_DIST_PENDING_SET);
 276                 break;
 277
 278         case IRQCHIP_STATE_ACTIVE:
 279                 *val = gic_peek_irq(d, GIC_DIST_ACTIVE_SET);
 280                 break;
 281
 282         case IRQCHIP_STATE_MASKED:
 283                 *val = !gic_peek_irq(d, GIC_DIST_ENABLE_SET);
 284                 break;
 285
 286         default:
 287                 return -EINVAL;
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int gic_set_type(struct irq_data *d, unsigned int type)
 294 {
 295         void __iomem *base = gic_dist_base(d);
 296         unsigned int gicirq = gic_irq(d);
 297
 298         /* Interrupt configuration for SGIs can't be changed */
 299         if (gicirq < 16)
 300                 return -EINVAL;
 301
 302         /* SPIs have restrictions on the supported types */
 303         if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
 304                             type != IRQ_TYPE_EDGE_RISING)
 305                 return -EINVAL;
 306
 307         return gic_configure_irq(gicirq, type, base, NULL);
 308 }
 309
 310 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
 311 {
 312         /* Only interrupts on the primary GIC can be forwarded to a vcpu. */
 313         if (cascading_gic_irq(d))
 314                 return -EINVAL;
 315
 316         if (vcpu)
 317                 irqd_set_forwarded_to_vcpu(d);
 318         else
 319                 irqd_clr_forwarded_to_vcpu(d);
 320         return 0;
 321 }
 322
 323 #ifdef CONFIG_SMP
 324 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 325                             bool force)
 326 {
 327         void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3);
 328         unsigned int cpu, shift = (gic_irq(d) % 4) * 8;
 329         u32 val, mask, bit;
 330         unsigned long flags;
 331
 332         if (!force)
 333                 cpu = cpumask_any_and(mask_val, cpu_online_mask);
 334         else
 335                 cpu = cpumask_first(mask_val);
 336
 337         if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
 338                 return -EINVAL;
 339
 340         gic_lock_irqsave(flags);
 341         mask = 0xff << shift;
 342         bit = gic_cpu_map[cpu] << shift;
 343         val = readl_relaxed(reg) & ~mask;
 344         writel_relaxed(val | bit, reg);
 345         gic_unlock_irqrestore(flags);
 346
 347         irq_data_update_effective_affinity(d, cpumask_of(cpu));
 348
 349         return IRQ_SET_MASK_OK_DONE;
 350 }
 351 #endif
 352
 353 static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 354 {
 355         u32 irqstat, irqnr;
 356         struct gic_chip_data *gic = &gic_data[0];
 357         void __iomem *cpu_base = gic_data_cpu_base(gic);
 358
 359         do {
 360                 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
 361                 irqnr = irqstat & GICC_IAR_INT_ID_MASK;
 362
 363                 if (likely(irqnr > 15 && irqnr < 1020)) {
 364                         if (static_branch_likely(&supports_deactivate_key))
 365                                 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
 366                         isb();
 367                         handle_domain_irq(gic->domain, irqnr, regs);
 368                         continue;
 369                 }
 370                 if (irqnr < 16) {
 371                         writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
 372                         if (static_branch_likely(&supports_deactivate_key))
 373                                 writel_relaxed(irqstat, cpu_base + GIC_CPU_DEACTIVATE);
 374 #ifdef CONFIG_SMP
 375                         /*
 376                          * Ensure any shared data written by the CPU sending
 377                          * the IPI is read after we've read the ACK register
 378                          * on the GIC.
 379                          *
 380                          * Pairs with the write barrier in gic_raise_softirq
 381                          */
 382                         smp_rmb();
 383                         handle_IPI(irqnr, regs);
 384 #endif
 385                         continue;
 386                 }
 387                 break;
 388         } while (1);
 389 }
 390
 391 static void gic_handle_cascade_irq(struct irq_desc *desc)
 392 {
 393         struct gic_chip_data *chip_data = irq_desc_get_handler_data(desc);
 394         struct irq_chip *chip = irq_desc_get_chip(desc);
 395         unsigned int cascade_irq, gic_irq;
 396         unsigned long status;
 397
 398         chained_irq_enter(chip, desc);
 399
 400         status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
 401
 402         gic_irq = (status & GICC_IAR_INT_ID_MASK);
 403         if (gic_irq == GICC_INT_SPURIOUS)
 404                 goto out;
 405
 406         cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
 407         if (unlikely(gic_irq < 32 || gic_irq > 1020)) {
 408                 handle_bad_irq(desc);
 409         } else {
 410                 isb();
 411                 generic_handle_irq(cascade_irq);
 412         }
 413
 414  out:
 415         chained_irq_exit(chip, desc);
 416 }
 417
 418 static const struct irq_chip gic_chip = {
 419         .irq_mask               = gic_mask_irq,
 420         .irq_unmask             = gic_unmask_irq,
 421         .irq_eoi                = gic_eoi_irq,
 422         .irq_set_type           = gic_set_type,
 423         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
 424         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 425         .flags                  = IRQCHIP_SET_TYPE_MASKED |
 426                                   IRQCHIP_SKIP_SET_WAKE |
 427                                   IRQCHIP_MASK_ON_SUSPEND,
 428 };
 429
 430 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
 431 {
 432         BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
 433         irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq,
 434                                          &gic_data[gic_nr]);
 435 }
 436
 437 static u8 gic_get_cpumask(struct gic_chip_data *gic)
 438 {
 439         void __iomem *base = gic_data_dist_base(gic);
 440         u32 mask, i;
 441
 442         for (i = mask = 0; i < 32; i += 4) {
 443                 mask = readl_relaxed(base + GIC_DIST_TARGET + i);
 444                 mask |= mask >> 16;
 445                 mask |= mask >> 8;
 446                 if (mask)
 447                         break;
 448         }
 449
 450         if (!mask && num_possible_cpus() > 1)
 451                 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
 452
 453         return mask;
 454 }
 455
 456 static bool gic_check_gicv2(void __iomem *base)
 457 {
 458         u32 val = readl_relaxed(base + GIC_CPU_IDENT);
 459         return (val & 0xff0fff) == 0x02043B;
 460 }
 461
 462 static void gic_cpu_if_up(struct gic_chip_data *gic)
 463 {
 464         void __iomem *cpu_base = gic_data_cpu_base(gic);
 465         u32 bypass = 0;
 466         u32 mode = 0;
 467         int i;
 468
 469         if (gic == &gic_data[0] && static_branch_likely(&supports_deactivate_key))
 470                 mode = GIC_CPU_CTRL_EOImodeNS;
 471
 472         if (gic_check_gicv2(cpu_base))
 473                 for (i = 0; i < 4; i++)
 474                         writel_relaxed(0, cpu_base + GIC_CPU_ACTIVEPRIO + i * 4);
 475
 476         /*
 477         * Preserve bypass disable bits to be written back later
 478         */
 479         bypass = readl(cpu_base + GIC_CPU_CTRL);
 480         bypass &= GICC_DIS_BYPASS_MASK;
 481
 482         writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL);
 483 }
 484
 485
 486 static void gic_dist_init(struct gic_chip_data *gic)
 487 {
 488         unsigned int i;
 489         u32 cpumask;
 490         unsigned int gic_irqs = gic->gic_irqs;
 491         void __iomem *base = gic_data_dist_base(gic);
 492
 493         writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL);
 494
 495         /*
 496          * Set all global interrupts to this CPU only.
 497          */
 498         cpumask = gic_get_cpumask(gic);
 499         cpumask |= cpumask << 8;
 500         cpumask |= cpumask << 16;
 501         for (i = 32; i < gic_irqs; i += 4)
 502                 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
 503
 504         gic_dist_config(base, gic_irqs, NULL);
 505
 506         writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
 507 }
 508
 509 static int gic_cpu_init(struct gic_chip_data *gic)
 510 {
 511         void __iomem *dist_base = gic_data_dist_base(gic);
 512         void __iomem *base = gic_data_cpu_base(gic);
 513         unsigned int cpu_mask, cpu = smp_processor_id();
 514         int i;
 515
 516         /*
 517          * Setting up the CPU map is only relevant for the primary GIC
 518          * because any nested/secondary GICs do not directly interface
 519          * with the CPU(s).
 520          */
 521         if (gic == &gic_data[0]) {
 522                 /*
 523                  * Get what the GIC says our CPU mask is.
 524                  */
 525                 if (WARN_ON(cpu >= NR_GIC_CPU_IF))
 526                         return -EINVAL;
 527
 528                 gic_check_cpu_features();
 529                 cpu_mask = gic_get_cpumask(gic);
 530                 gic_cpu_map[cpu] = cpu_mask;
 531
 532                 /*
 533                  * Clear our mask from the other map entries in case they're
 534                  * still undefined.
 535                  */
 536                 for (i = 0; i < NR_GIC_CPU_IF; i++)
 537                         if (i != cpu)
 538                                 gic_cpu_map[i] &= ~cpu_mask;
 539         }
 540
 541         gic_cpu_config(dist_base, NULL);
 542
 543         writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
 544         gic_cpu_if_up(gic);
 545
 546         return 0;
 547 }
 548
 549 int gic_cpu_if_down(unsigned int gic_nr)
 550 {
 551         void __iomem *cpu_base;
 552         u32 val = 0;
 553
 554         if (gic_nr >= CONFIG_ARM_GIC_MAX_NR)
 555                 return -EINVAL;
 556
 557         cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
 558         val = readl(cpu_base + GIC_CPU_CTRL);
 559         val &= ~GICC_ENABLE;
 560         writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
 561
 562         return 0;
 563 }
 564
 565 #if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM)
 566 /*
 567  * Saves the GIC distributor registers during suspend or idle.  Must be called
 568  * with interrupts disabled but before powering down the GIC.  After calling
 569  * this function, no interrupts will be delivered by the GIC, and another
 570  * platform-specific wakeup source must be enabled.
 571  */
 572 void gic_dist_save(struct gic_chip_data *gic)
 573 {
 574         unsigned int gic_irqs;
 575         void __iomem *dist_base;
 576         int i;
 577
 578         if (WARN_ON(!gic))
 579                 return;
 580
 581         gic_irqs = gic->gic_irqs;
 582         dist_base = gic_data_dist_base(gic);
 583
 584         if (!dist_base)
 585                 return;
 586
 587         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
 588                 gic->saved_spi_conf[i] =
 589                         readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
 590
 591         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
 592                 gic->saved_spi_target[i] =
 593                         readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
 594
 595         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
 596                 gic->saved_spi_enable[i] =
 597                         readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
 598
 599         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
 600                 gic->saved_spi_active[i] =
 601                         readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 602 }
 603
 604 /*
 605  * Restores the GIC distributor registers during resume or when coming out of
 606  * idle.  Must be called before enabling interrupts.  If a level interrupt
 607  * that occurred while the GIC was suspended is still present, it will be
 608  * handled normally, but any edge interrupts that occurred will not be seen by
 609  * the GIC and need to be handled by the platform-specific wakeup source.
 610  */
 611 void gic_dist_restore(struct gic_chip_data *gic)
 612 {
 613         unsigned int gic_irqs;
 614         unsigned int i;
 615         void __iomem *dist_base;
 616
 617         if (WARN_ON(!gic))
 618                 return;
 619
 620         gic_irqs = gic->gic_irqs;
 621         dist_base = gic_data_dist_base(gic);
 622
 623         if (!dist_base)
 624                 return;
 625
 626         writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
 627
 628         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
 629                 writel_relaxed(gic->saved_spi_conf[i],
 630                         dist_base + GIC_DIST_CONFIG + i * 4);
 631
 632         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
 633                 writel_relaxed(GICD_INT_DEF_PRI_X4,
 634                         dist_base + GIC_DIST_PRI + i * 4);
 635
 636         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
 637                 writel_relaxed(gic->saved_spi_target[i],
 638                         dist_base + GIC_DIST_TARGET + i * 4);
 639
 640         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
 641                 writel_relaxed(GICD_INT_EN_CLR_X32,
 642                         dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
 643                 writel_relaxed(gic->saved_spi_enable[i],
 644                         dist_base + GIC_DIST_ENABLE_SET + i * 4);
 645         }
 646
 647         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
 648                 writel_relaxed(GICD_INT_EN_CLR_X32,
 649                         dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
 650                 writel_relaxed(gic->saved_spi_active[i],
 651                         dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 652         }
 653
 654         writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
 655 }
 656
 657 void gic_cpu_save(struct gic_chip_data *gic)
 658 {
 659         int i;
 660         u32 *ptr;
 661         void __iomem *dist_base;
 662         void __iomem *cpu_base;
 663
 664         if (WARN_ON(!gic))
 665                 return;
 666
 667         dist_base = gic_data_dist_base(gic);
 668         cpu_base = gic_data_cpu_base(gic);
 669
 670         if (!dist_base || !cpu_base)
 671                 return;
 672
 673         ptr = raw_cpu_ptr(gic->saved_ppi_enable);
 674         for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
 675                 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
 676
 677         ptr = raw_cpu_ptr(gic->saved_ppi_active);
 678         for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
 679                 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 680
 681         ptr = raw_cpu_ptr(gic->saved_ppi_conf);
 682         for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
 683                 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
 684
 685 }
 686
 687 void gic_cpu_restore(struct gic_chip_data *gic)
 688 {
 689         int i;
 690         u32 *ptr;
 691         void __iomem *dist_base;
 692         void __iomem *cpu_base;
 693
 694         if (WARN_ON(!gic))
 695                 return;
 696
 697         dist_base = gic_data_dist_base(gic);
 698         cpu_base = gic_data_cpu_base(gic);
 699
 700         if (!dist_base || !cpu_base)
 701                 return;
 702
 703         ptr = raw_cpu_ptr(gic->saved_ppi_enable);
 704         for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
 705                 writel_relaxed(GICD_INT_EN_CLR_X32,
 706                                dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
 707                 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
 708         }
 709
 710         ptr = raw_cpu_ptr(gic->saved_ppi_active);
 711         for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
 712                 writel_relaxed(GICD_INT_EN_CLR_X32,
 713                                dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
 714                 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 715         }
 716
 717         ptr = raw_cpu_ptr(gic->saved_ppi_conf);
 718         for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
 719                 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
 720
 721         for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
 722                 writel_relaxed(GICD_INT_DEF_PRI_X4,
 723                                         dist_base + GIC_DIST_PRI + i * 4);
 724
 725         writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
 726         gic_cpu_if_up(gic);
 727 }
 728
 729 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
 730 {
 731         int i;
 732
 733         for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
 734 #ifdef CONFIG_GIC_NON_BANKED
 735                 /* Skip over unused GICs */
 736                 if (!gic_data[i].get_base)
 737                         continue;
 738 #endif
 739                 switch (cmd) {
 740                 case CPU_PM_ENTER:
 741                         gic_cpu_save(&gic_data[i]);
 742                         break;
 743                 case CPU_PM_ENTER_FAILED:
 744                 case CPU_PM_EXIT:
 745                         gic_cpu_restore(&gic_data[i]);
 746                         break;
 747                 case CPU_CLUSTER_PM_ENTER:
 748                         gic_dist_save(&gic_data[i]);
 749                         break;
 750                 case CPU_CLUSTER_PM_ENTER_FAILED:
 751                 case CPU_CLUSTER_PM_EXIT:
 752                         gic_dist_restore(&gic_data[i]);
 753                         break;
 754                 }
 755         }
 756
 757         return NOTIFY_OK;
 758 }
 759
 760 static struct notifier_block gic_notifier_block = {
 761         .notifier_call = gic_notifier,
 762 };
 763
 764 static int gic_pm_init(struct gic_chip_data *gic)
 765 {
 766         gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
 767                 sizeof(u32));
 768         if (WARN_ON(!gic->saved_ppi_enable))
 769                 return -ENOMEM;
 770
 771         gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
 772                 sizeof(u32));
 773         if (WARN_ON(!gic->saved_ppi_active))
 774                 goto free_ppi_enable;
 775
 776         gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
 777                 sizeof(u32));
 778         if (WARN_ON(!gic->saved_ppi_conf))
 779                 goto free_ppi_active;
 780
 781         if (gic == &gic_data[0])
 782                 cpu_pm_register_notifier(&gic_notifier_block);
 783
 784         return 0;
 785
 786 free_ppi_active:
 787         free_percpu(gic->saved_ppi_active);
 788 free_ppi_enable:
 789         free_percpu(gic->saved_ppi_enable);
 790
 791         return -ENOMEM;
 792 }
 793 #else
 794 static int gic_pm_init(struct gic_chip_data *gic)
 795 {
 796         return 0;
 797 }
 798 #endif
 799
 800 #ifdef CONFIG_SMP
 801 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 802 {
 803         int cpu;
 804         unsigned long flags, map = 0;
 805
 806         if (unlikely(nr_cpu_ids == 1)) {
 807                 /* Only one CPU? let's do a self-IPI... */
 808                 writel_relaxed(2 << 24 | irq,
 809                                gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
 810                 return;
 811         }
 812
 813         gic_lock_irqsave(flags);
 814
 815         /* Convert our logical CPU mask into a physical one. */
 816         for_each_cpu(cpu, mask)
 817                 map |= gic_cpu_map[cpu];
 818
 819         /*
 820          * Ensure that stores to Normal memory are visible to the
 821          * other CPUs before they observe us issuing the IPI.
 822          */
 823         dmb(ishst);
 824
 825         /* this always happens on GIC0 */
 826         writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
 827
 828         gic_unlock_irqrestore(flags);
 829 }
 830 #endif
 831
 832 #ifdef CONFIG_BL_SWITCHER
 833 /*
 834  * gic_send_sgi - send a SGI directly to given CPU interface number
 835  *
 836  * cpu_id: the ID for the destination CPU interface
 837  * irq: the IPI number to send a SGI for
 838  */
 839 void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
 840 {
 841         BUG_ON(cpu_id >= NR_GIC_CPU_IF);
 842         cpu_id = 1 << cpu_id;
 843         /* this always happens on GIC0 */
 844         writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
 845 }
 846
 847 /*
 848  * gic_get_cpu_id - get the CPU interface ID for the specified CPU
 849  *
 850  * @cpu: the logical CPU number to get the GIC ID for.
 851  *
 852  * Return the CPU interface ID for the given logical CPU number,
 853  * or -1 if the CPU number is too large or the interface ID is
 854  * unknown (more than one bit set).
 855  */
 856 int gic_get_cpu_id(unsigned int cpu)
 857 {
 858         unsigned int cpu_bit;
 859
 860         if (cpu >= NR_GIC_CPU_IF)
 861                 return -1;
 862         cpu_bit = gic_cpu_map[cpu];
 863         if (cpu_bit & (cpu_bit - 1))
 864                 return -1;
 865         return __ffs(cpu_bit);
 866 }
 867
 868 /*
 869  * gic_migrate_target - migrate IRQs to another CPU interface
 870  *
 871  * @new_cpu_id: the CPU target ID to migrate IRQs to
 872  *
 873  * Migrate all peripheral interrupts with a target matching the current CPU
 874  * to the interface corresponding to @new_cpu_id.  The CPU interface mapping
 875  * is also updated.  Targets to other CPU interfaces are unchanged.
 876  * This must be called with IRQs locally disabled.
 877  */
 878 void gic_migrate_target(unsigned int new_cpu_id)
 879 {
 880         unsigned int cur_cpu_id, gic_irqs, gic_nr = 0;
 881         void __iomem *dist_base;
 882         int i, ror_val, cpu = smp_processor_id();
 883         u32 val, cur_target_mask, active_mask;
 884
 885         BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
 886
 887         dist_base = gic_data_dist_base(&gic_data[gic_nr]);
 888         if (!dist_base)
 889                 return;
 890         gic_irqs = gic_data[gic_nr].gic_irqs;
 891
 892         cur_cpu_id = __ffs(gic_cpu_map[cpu]);
 893         cur_target_mask = 0x01010101 << cur_cpu_id;
 894         ror_val = (cur_cpu_id - new_cpu_id) & 31;
 895
 896         gic_lock();
 897
 898         /* Update the target interface for this logical CPU */
 899         gic_cpu_map[cpu] = 1 << new_cpu_id;
 900
 901         /*
 902          * Find all the peripheral interrupts targeting the current
 903          * CPU interface and migrate them to the new CPU interface.
 904          * We skip DIST_TARGET 0 to 7 as they are read-only.
 905          */
 906         for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) {
 907                 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
 908                 active_mask = val & cur_target_mask;
 909                 if (active_mask) {
 910                         val &= ~active_mask;
 911                         val |= ror32(active_mask, ror_val);
 912                         writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4);
 913                 }
 914         }
 915
 916         gic_unlock();
 917
 918         /*
 919          * Now let's migrate and clear any potential SGIs that might be
 920          * pending for us (cur_cpu_id).  Since GIC_DIST_SGI_PENDING_SET
 921          * is a banked register, we can only forward the SGI using
 922          * GIC_DIST_SOFTINT.  The original SGI source is lost but Linux
 923          * doesn't use that information anyway.
 924          *
 925          * For the same reason we do not adjust SGI source information
 926          * for previously sent SGIs by us to other CPUs either.
 927          */
 928         for (i = 0; i < 16; i += 4) {
 929                 int j;
 930                 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i);
 931                 if (!val)
 932                         continue;
 933                 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i);
 934                 for (j = i; j < i + 4; j++) {
 935                         if (val & 0xff)
 936                                 writel_relaxed((1 << (new_cpu_id + 16)) | j,
 937                                                 dist_base + GIC_DIST_SOFTINT);
 938                         val >>= 8;
 939                 }
 940         }
 941 }
 942
 943 /*
 944  * gic_get_sgir_physaddr - get the physical address for the SGI register
 945  *
 946  * REturn the physical address of the SGI register to be used
 947  * by some early assembly code when the kernel is not yet available.
 948  */
 949 static unsigned long gic_dist_physaddr;
 950
 951 unsigned long gic_get_sgir_physaddr(void)
 952 {
 953         if (!gic_dist_physaddr)
 954                 return 0;
 955         return gic_dist_physaddr + GIC_DIST_SOFTINT;
 956 }
 957
 958 static void __init gic_init_physaddr(struct device_node *node)
 959 {
 960         struct resource res;
 961         if (of_address_to_resource(node, 0, &res) == 0) {
 962                 gic_dist_physaddr = res.start;
 963                 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
 964         }
 965 }
 966
 967 #else
 968 #define gic_init_physaddr(node)  do { } while (0)
 969 #endif
 970
 971 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
 972                                 irq_hw_number_t hw)
 973 {
 974         struct gic_chip_data *gic = d->host_data;
 975
 976         if (hw < 32) {
 977                 irq_set_percpu_devid(irq);
 978                 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
 979                                     handle_percpu_devid_irq, NULL, NULL);
 980                 irq_set_status_flags(irq, IRQ_NOAUTOEN);
 981         } else {
 982                 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
 983                                     handle_fasteoi_irq, NULL, NULL);
 984                 irq_set_probe(irq);
 985                 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
 986         }
 987         return 0;
 988 }
 989
 990 static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
 991 {
 992 }
 993
 994 static int gic_irq_domain_translate(struct irq_domain *d,
 995                                     struct irq_fwspec *fwspec,
 996                                     unsigned long *hwirq,
 997                                     unsigned int *type)
 998 {
 999         if (is_of_node(fwspec->fwnode)) {
1000                 if (fwspec->param_count < 3)
1001                         return -EINVAL;
1002
1003                 /* Get the interrupt number and add 16 to skip over SGIs */
1004                 *hwirq = fwspec->param[1] + 16;
1005
1006                 /*
1007                  * For SPIs, we need to add 16 more to get the GIC irq
1008                  * ID number
1009                  */
1010                 if (!fwspec->param[0])
1011                         *hwirq += 16;
1012
1013                 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1014
1015                 /* Make it clear that broken DTs are... broken */
1016                 WARN_ON(*type == IRQ_TYPE_NONE);
1017                 return 0;
1018         }
1019
1020         if (is_fwnode_irqchip(fwspec->fwnode)) {
1021                 if(fwspec->param_count != 2)
1022                         return -EINVAL;
1023
1024                 *hwirq = fwspec->param[0];
1025                 *type = fwspec->param[1];
1026
1027                 WARN_ON(*type == IRQ_TYPE_NONE);
1028                 return 0;
1029         }
1030
1031         return -EINVAL;
1032 }
1033
1034 static int gic_starting_cpu(unsigned int cpu)
1035 {
1036         gic_cpu_init(&gic_data[0]);
1037         return 0;
1038 }
1039
1040 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
1041                                 unsigned int nr_irqs, void *arg)
1042 {
1043         int i, ret;
1044         irq_hw_number_t hwirq;
1045         unsigned int type = IRQ_TYPE_NONE;
1046         struct irq_fwspec *fwspec = arg;
1047
1048         ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
1049         if (ret)
1050                 return ret;
1051
1052         for (i = 0; i < nr_irqs; i++) {
1053                 ret = gic_irq_domain_map(domain, virq + i, hwirq + i);
1054                 if (ret)
1055                         return ret;
1056         }
1057
1058         return 0;
1059 }
1060
1061 static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
1062         .translate = gic_irq_domain_translate,
1063         .alloc = gic_irq_domain_alloc,
1064         .free = irq_domain_free_irqs_top,
1065 };
1066
1067 static const struct irq_domain_ops gic_irq_domain_ops = {
1068         .map = gic_irq_domain_map,
1069         .unmap = gic_irq_domain_unmap,
1070 };
1071
1072 static void gic_init_chip(struct gic_chip_data *gic, struct device *dev,
1073                           const char *name, bool use_eoimode1)
1074 {
1075         /* Initialize irq_chip */
1076         gic->chip = gic_chip;
1077         gic->chip.name = name;
1078         gic->chip.parent_device = dev;
1079
1080         if (use_eoimode1) {
1081                 gic->chip.irq_mask = gic_eoimode1_mask_irq;
1082                 gic->chip.irq_eoi = gic_eoimode1_eoi_irq;
1083                 gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity;
1084         }
1085
1086 #ifdef CONFIG_SMP
1087         if (gic == &gic_data[0])
1088                 gic->chip.irq_set_affinity = gic_set_affinity;
1089 #endif
1090 }
1091
1092 static int gic_init_bases(struct gic_chip_data *gic,
1093                           struct fwnode_handle *handle)
1094 {
1095         int gic_irqs, ret;
1096
1097         if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
1098                 /* Frankein-GIC without banked registers... */
1099                 unsigned int cpu;
1100
1101                 gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
1102                 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
1103                 if (WARN_ON(!gic->dist_base.percpu_base ||
1104                             !gic->cpu_base.percpu_base)) {
1105                         ret = -ENOMEM;
1106                         goto error;
1107                 }
1108
1109                 for_each_possible_cpu(cpu) {
1110                         u32 mpidr = cpu_logical_map(cpu);
1111                         u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
1112                         unsigned long offset = gic->percpu_offset * core_id;
1113                         *per_cpu_ptr(gic->dist_base.percpu_base, cpu) =
1114                                 gic->raw_dist_base + offset;
1115                         *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) =
1116                                 gic->raw_cpu_base + offset;
1117                 }
1118
1119                 gic_set_base_accessor(gic, gic_get_percpu_base);
1120         } else {
1121                 /* Normal, sane GIC... */
1122                 WARN(gic->percpu_offset,
1123                      "GIC_NON_BANKED not enabled, ignoring %08x offset!",
1124                      gic->percpu_offset);
1125                 gic->dist_base.common_base = gic->raw_dist_base;
1126                 gic->cpu_base.common_base = gic->raw_cpu_base;
1127                 gic_set_base_accessor(gic, gic_get_common_base);
1128         }
1129
1130         /*
1131          * Find out how many interrupts are supported.
1132          * The GIC only supports up to 1020 interrupt sources.
1133          */
1134         gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
1135         gic_irqs = (gic_irqs + 1) * 32;
1136         if (gic_irqs > 1020)
1137                 gic_irqs = 1020;
1138         gic->gic_irqs = gic_irqs;
1139
1140         if (handle) {           /* DT/ACPI */
1141                 gic->domain = irq_domain_create_linear(handle, gic_irqs,
1142                                                        &gic_irq_domain_hierarchy_ops,
1143                                                        gic);
1144         } else {                /* Legacy support */
1145                 /*
1146                  * For primary GICs, skip over SGIs.
1147                  * No secondary GIC support whatsoever.
1148                  */
1149                 int irq_base;
1150
1151                 gic_irqs -= 16; /* calculate # of irqs to allocate */
1152
1153                 irq_base = irq_alloc_descs(16, 16, gic_irqs,
1154                                            numa_node_id());
1155                 if (irq_base < 0) {
1156                         WARN(1, "Cannot allocate irq_descs @ IRQ16, assuming pre-allocated\n");
1157                         irq_base = 16;
1158                 }
1159
1160                 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
1161                                                     16, &gic_irq_domain_ops, gic);
1162         }
1163
1164         if (WARN_ON(!gic->domain)) {
1165                 ret = -ENODEV;
1166                 goto error;
1167         }
1168
1169         gic_dist_init(gic);
1170         ret = gic_cpu_init(gic);
1171         if (ret)
1172                 goto error;
1173
1174         ret = gic_pm_init(gic);
1175         if (ret)
1176                 goto error;
1177
1178         return 0;
1179
1180 error:
1181         if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
1182                 free_percpu(gic->dist_base.percpu_base);
1183                 free_percpu(gic->cpu_base.percpu_base);
1184         }
1185
1186         return ret;
1187 }
1188
1189 static int __init __gic_init_bases(struct gic_chip_data *gic,
1190                                    struct fwnode_handle *handle)
1191 {
1192         char *name;
1193         int i, ret;
1194
1195         if (WARN_ON(!gic || gic->domain))
1196                 return -EINVAL;
1197
1198         if (gic == &gic_data[0]) {
1199                 /*
1200                  * Initialize the CPU interface map to all CPUs.
1201                  * It will be refined as each CPU probes its ID.
1202                  * This is only necessary for the primary GIC.
1203                  */
1204                 for (i = 0; i < NR_GIC_CPU_IF; i++)
1205                         gic_cpu_map[i] = 0xff;
1206 #ifdef CONFIG_SMP
1207                 set_smp_cross_call(gic_raise_softirq);
1208 #endif
1209                 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
1210                                           "irqchip/arm/gic:starting",
1211                                           gic_starting_cpu, NULL);
1212                 set_handle_irq(gic_handle_irq);
1213                 if (static_branch_likely(&supports_deactivate_key))
1214                         pr_info("GIC: Using split EOI/Deactivate mode\n");
1215         }
1216
1217         if (static_branch_likely(&supports_deactivate_key) && gic == &gic_data[0]) {
1218                 name = kasprintf(GFP_KERNEL, "GICv2");
1219                 gic_init_chip(gic, NULL, name, true);
1220         } else {
1221                 name = kasprintf(GFP_KERNEL, "GIC-%d", (int)(gic-&gic_data[0]));
1222                 gic_init_chip(gic, NULL, name, false);
1223         }
1224
1225         ret = gic_init_bases(gic, handle);
1226         if (ret)
1227                 kfree(name);
1228
1229         return ret;
1230 }
1231
1232 void __init gic_init(void __iomem *dist_base, void __iomem *cpu_base)
1233 {
1234         struct gic_chip_data *gic;
1235
1236         /*
1237          * Non-DT/ACPI systems won't run a hypervisor, so let's not
1238          * bother with these...
1239          */
1240         static_branch_disable(&supports_deactivate_key);
1241
1242         gic = &gic_data[0];
1243         gic->raw_dist_base = dist_base;
1244         gic->raw_cpu_base = cpu_base;
1245
1246         __gic_init_bases(gic, NULL);
1247 }
1248
1249 static void gic_teardown(struct gic_chip_data *gic)
1250 {
1251         if (WARN_ON(!gic))
1252                 return;
1253
1254         if (gic->raw_dist_base)
1255                 iounmap(gic->raw_dist_base);
1256         if (gic->raw_cpu_base)
1257                 iounmap(gic->raw_cpu_base);
1258 }
1259
1260 #ifdef CONFIG_OF
1261 static int gic_cnt __initdata;
1262 static bool gicv2_force_probe;
1263
1264 static int __init gicv2_force_probe_cfg(char *buf)
1265 {
1266         return strtobool(buf, &gicv2_force_probe);
1267 }
1268 early_param("irqchip.gicv2_force_probe", gicv2_force_probe_cfg);
1269
1270 static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
1271 {
1272         struct resource cpuif_res;
1273
1274         of_address_to_resource(node, 1, &cpuif_res);
1275
1276         if (!is_hyp_mode_available())
1277                 return false;
1278         if (resource_size(&cpuif_res) < SZ_8K) {
1279                 void __iomem *alt;
1280                 /*
1281                  * Check for a stupid firmware that only exposes the
1282                  * first page of a GICv2.
1283                  */
1284                 if (!gic_check_gicv2(*base))
1285                         return false;
1286
1287                 if (!gicv2_force_probe) {
1288                         pr_warn("GIC: GICv2 detected, but range too small and irqchip.gicv2_force_probe not set\n");
1289                         return false;
1290                 }
1291
1292                 alt = ioremap(cpuif_res.start, SZ_8K);
1293                 if (!alt)
1294                         return false;
1295                 if (!gic_check_gicv2(alt + SZ_4K)) {
1296                         /*
1297                          * The first page was that of a GICv2, and
1298                          * the second was *something*. Let's trust it
1299                          * to be a GICv2, and update the mapping.
1300                          */
1301                         pr_warn("GIC: GICv2 at %pa, but range is too small (broken DT?), assuming 8kB\n",
1302                                 &cpuif_res.start);
1303                         iounmap(*base);
1304                         *base = alt;
1305                         return true;
1306                 }
1307
1308                 /*
1309                  * We detected *two* initial GICv2 pages in a
1310                  * row. Could be a GICv2 aliased over two 64kB
1311                  * pages. Update the resource, map the iospace, and
1312                  * pray.
1313                  */
1314                 iounmap(alt);
1315                 alt = ioremap(cpuif_res.start, SZ_128K);
1316                 if (!alt)
1317                         return false;
1318                 pr_warn("GIC: Aliased GICv2 at %pa, trying to find the canonical range over 128kB\n",
1319                         &cpuif_res.start);
1320                 cpuif_res.end = cpuif_res.start + SZ_128K -1;
1321                 iounmap(*base);
1322                 *base = alt;
1323         }
1324         if (resource_size(&cpuif_res) == SZ_128K) {
1325                 /*
1326                  * Verify that we have the first 4kB of a GICv2
1327                  * aliased over the first 64kB by checking the
1328                  * GICC_IIDR register on both ends.
1329                  */
1330                 if (!gic_check_gicv2(*base) ||
1331                     !gic_check_gicv2(*base + 0xf000))
1332                         return false;
1333
1334                 /*
1335                  * Move the base up by 60kB, so that we have a 8kB
1336                  * contiguous region, which allows us to use GICC_DIR
1337                  * at its normal offset. Please pass me that bucket.
1338                  */
1339                 *base += 0xf000;
1340                 cpuif_res.start += 0xf000;
1341                 pr_warn("GIC: Adjusting CPU interface base to %pa\n",
1342                         &cpuif_res.start);
1343         }
1344
1345         return true;
1346 }
1347
1348 static int gic_of_setup(struct gic_chip_data *gic, struct device_node *node)
1349 {
1350         if (!gic || !node)
1351                 return -EINVAL;
1352
1353         gic->raw_dist_base = of_iomap(node, 0);
1354         if (WARN(!gic->raw_dist_base, "unable to map gic dist registers\n"))
1355                 goto error;
1356
1357         gic->raw_cpu_base = of_iomap(node, 1);
1358         if (WARN(!gic->raw_cpu_base, "unable to map gic cpu registers\n"))
1359                 goto error;
1360
1361         if (of_property_read_u32(node, "cpu-offset", &gic->percpu_offset))
1362                 gic->percpu_offset = 0;
1363
1364         return 0;
1365
1366 error:
1367         gic_teardown(gic);
1368
1369         return -ENOMEM;
1370 }
1371
1372 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq)
1373 {
1374         int ret;
1375
1376         if (!dev || !dev->of_node || !gic || !irq)
1377                 return -EINVAL;
1378
1379         *gic = devm_kzalloc(dev, sizeof(**gic), GFP_KERNEL);
1380         if (!*gic)
1381                 return -ENOMEM;
1382
1383         gic_init_chip(*gic, dev, dev->of_node->name, false);
1384
1385         ret = gic_of_setup(*gic, dev->of_node);
1386         if (ret)
1387                 return ret;
1388
1389         ret = gic_init_bases(*gic, &dev->of_node->fwnode);
1390         if (ret) {
1391                 gic_teardown(*gic);
1392                 return ret;
1393         }
1394
1395         irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq, *gic);
1396
1397         return 0;
1398 }
1399
1400 static void __init gic_of_setup_kvm_info(struct device_node *node)
1401 {
1402         int ret;
1403         struct resource *vctrl_res = &gic_v2_kvm_info.vctrl;
1404         struct resource *vcpu_res = &gic_v2_kvm_info.vcpu;
1405
1406         gic_v2_kvm_info.type = GIC_V2;
1407
1408         gic_v2_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1409         if (!gic_v2_kvm_info.maint_irq)
1410                 return;
1411
1412         ret = of_address_to_resource(node, 2, vctrl_res);
1413         if (ret)
1414                 return;
1415
1416         ret = of_address_to_resource(node, 3, vcpu_res);
1417         if (ret)
1418                 return;
1419
1420         if (static_branch_likely(&supports_deactivate_key))
1421                 gic_set_kvm_info(&gic_v2_kvm_info);
1422 }
1423
1424 int __init
1425 gic_of_init(struct device_node *node, struct device_node *parent)
1426 {
1427         struct gic_chip_data *gic;
1428         int irq, ret;
1429
1430         if (WARN_ON(!node))
1431                 return -ENODEV;
1432
1433         if (WARN_ON(gic_cnt >= CONFIG_ARM_GIC_MAX_NR))
1434                 return -EINVAL;
1435
1436         gic = &gic_data[gic_cnt];
1437
1438         ret = gic_of_setup(gic, node);
1439         if (ret)
1440                 return ret;
1441
1442         /*
1443          * Disable split EOI/Deactivate if either HYP is not available
1444          * or the CPU interface is too small.
1445          */
1446         if (gic_cnt == 0 && !gic_check_eoimode(node, &gic->raw_cpu_base))
1447                 static_branch_disable(&supports_deactivate_key);
1448
1449         ret = __gic_init_bases(gic, &node->fwnode);
1450         if (ret) {
1451                 gic_teardown(gic);
1452                 return ret;
1453         }
1454
1455         if (!gic_cnt) {
1456                 gic_init_physaddr(node);
1457                 gic_of_setup_kvm_info(node);
1458         }
1459
1460         if (parent) {
1461                 irq = irq_of_parse_and_map(node, 0);
1462                 gic_cascade_irq(gic_cnt, irq);
1463         }
1464
1465         if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1466                 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain);
1467
1468         gic_cnt++;
1469         return 0;
1470 }
1471 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
1472 IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
1473 IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
1474 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
1475 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
1476 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
1477 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
1478 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
1479 IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init);
1480 #else
1481 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq)
1482 {
1483         return -ENOTSUPP;
1484 }
1485 #endif
1486
1487 #ifdef CONFIG_ACPI
1488 static struct
1489 {
1490         phys_addr_t cpu_phys_base;
1491         u32 maint_irq;
1492         int maint_irq_mode;
1493         phys_addr_t vctrl_base;
1494         phys_addr_t vcpu_base;
1495 } acpi_data __initdata;
1496
1497 static int __init
1498 gic_acpi_parse_madt_cpu(union acpi_subtable_headers *header,
1499                         const unsigned long end)
1500 {
1501         struct acpi_madt_generic_interrupt *processor;
1502         phys_addr_t gic_cpu_base;
1503         static int cpu_base_assigned;
1504
1505         processor = (struct acpi_madt_generic_interrupt *)header;
1506
1507         if (BAD_MADT_GICC_ENTRY(processor, end))
1508                 return -EINVAL;
1509
1510         /*
1511          * There is no support for non-banked GICv1/2 register in ACPI spec.
1512          * All CPU interface addresses have to be the same.
1513          */
1514         gic_cpu_base = processor->base_address;
1515         if (cpu_base_assigned && gic_cpu_base != acpi_data.cpu_phys_base)
1516                 return -EINVAL;
1517
1518         acpi_data.cpu_phys_base = gic_cpu_base;
1519         acpi_data.maint_irq = processor->vgic_interrupt;
1520         acpi_data.maint_irq_mode = (processor->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
1521                                     ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
1522         acpi_data.vctrl_base = processor->gich_base_address;
1523         acpi_data.vcpu_base = processor->gicv_base_address;
1524
1525         cpu_base_assigned = 1;
1526         return 0;
1527 }
1528
1529 /* The things you have to do to just *count* something... */
1530 static int __init acpi_dummy_func(union acpi_subtable_headers *header,
1531                                   const unsigned long end)
1532 {
1533         return 0;
1534 }
1535
1536 static bool __init acpi_gic_redist_is_present(void)
1537 {
1538         return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1539                                      acpi_dummy_func, 0) > 0;
1540 }
1541
1542 static bool __init gic_validate_dist(struct acpi_subtable_header *header,
1543                                      struct acpi_probe_entry *ape)
1544 {
1545         struct acpi_madt_generic_distributor *dist;
1546         dist = (struct acpi_madt_generic_distributor *)header;
1547
1548         return (dist->version == ape->driver_data &&
1549                 (dist->version != ACPI_MADT_GIC_VERSION_NONE ||
1550                  !acpi_gic_redist_is_present()));
1551 }
1552
1553 #define ACPI_GICV2_DIST_MEM_SIZE        (SZ_4K)
1554 #define ACPI_GIC_CPU_IF_MEM_SIZE        (SZ_8K)
1555 #define ACPI_GICV2_VCTRL_MEM_SIZE       (SZ_4K)
1556 #define ACPI_GICV2_VCPU_MEM_SIZE        (SZ_8K)
1557
1558 static void __init gic_acpi_setup_kvm_info(void)
1559 {
1560         int irq;
1561         struct resource *vctrl_res = &gic_v2_kvm_info.vctrl;
1562         struct resource *vcpu_res = &gic_v2_kvm_info.vcpu;
1563
1564         gic_v2_kvm_info.type = GIC_V2;
1565
1566         if (!acpi_data.vctrl_base)
1567                 return;
1568
1569         vctrl_res->flags = IORESOURCE_MEM;
1570         vctrl_res->start = acpi_data.vctrl_base;
1571         vctrl_res->end = vctrl_res->start + ACPI_GICV2_VCTRL_MEM_SIZE - 1;
1572
1573         if (!acpi_data.vcpu_base)
1574                 return;
1575
1576         vcpu_res->flags = IORESOURCE_MEM;
1577         vcpu_res->start = acpi_data.vcpu_base;
1578         vcpu_res->end = vcpu_res->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
1579
1580         irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
1581                                 acpi_data.maint_irq_mode,
1582                                 ACPI_ACTIVE_HIGH);
1583         if (irq <= 0)
1584                 return;
1585
1586         gic_v2_kvm_info.maint_irq = irq;
1587
1588         gic_set_kvm_info(&gic_v2_kvm_info);
1589 }
1590
1591 static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
1592                                    const unsigned long end)
1593 {
1594         struct acpi_madt_generic_distributor *dist;
1595         struct fwnode_handle *domain_handle;
1596         struct gic_chip_data *gic = &gic_data[0];
1597         int count, ret;
1598
1599         /* Collect CPU base addresses */
1600         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1601                                       gic_acpi_parse_madt_cpu, 0);
1602         if (count <= 0) {
1603                 pr_err("No valid GICC entries exist\n");
1604                 return -EINVAL;
1605         }
1606
1607         gic->raw_cpu_base = ioremap(acpi_data.cpu_phys_base, ACPI_GIC_CPU_IF_MEM_SIZE);
1608         if (!gic->raw_cpu_base) {
1609                 pr_err("Unable to map GICC registers\n");
1610                 return -ENOMEM;
1611         }
1612
1613         dist = (struct acpi_madt_generic_distributor *)header;
1614         gic->raw_dist_base = ioremap(dist->base_address,
1615                                      ACPI_GICV2_DIST_MEM_SIZE);
1616         if (!gic->raw_dist_base) {
1617                 pr_err("Unable to map GICD registers\n");
1618                 gic_teardown(gic);
1619                 return -ENOMEM;
1620         }
1621
1622         /*
1623          * Disable split EOI/Deactivate if HYP is not available. ACPI
1624          * guarantees that we'll always have a GICv2, so the CPU
1625          * interface will always be the right size.
1626          */
1627         if (!is_hyp_mode_available())
1628                 static_branch_disable(&supports_deactivate_key);
1629
1630         /*
1631          * Initialize GIC instance zero (no multi-GIC support).
1632          */
1633         domain_handle = irq_domain_alloc_fwnode(gic->raw_dist_base);
1634         if (!domain_handle) {
1635                 pr_err("Unable to allocate domain handle\n");
1636                 gic_teardown(gic);
1637                 return -ENOMEM;
1638         }
1639
1640         ret = __gic_init_bases(gic, domain_handle);
1641         if (ret) {
1642                 pr_err("Failed to initialise GIC\n");
1643                 irq_domain_free_fwnode(domain_handle);
1644                 gic_teardown(gic);
1645                 return ret;
1646         }
1647
1648         acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1649
1650         if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1651                 gicv2m_init(NULL, gic_data[0].domain);
1652
1653         if (static_branch_likely(&supports_deactivate_key))
1654                 gic_acpi_setup_kvm_info();
1655
1656         return 0;
1657 }
1658 IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1659                      gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
1660                      gic_v2_acpi_init);
1661 IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1662                      gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,
1663                      gic_v2_acpi_init);
1664 #endif