drivers/irqchip/irq-gic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 2002 ARM Limited, All Rights Reserved.
   4  *
   5  * Interrupt architecture for the GIC:
   6  *
   7  * o There is one Interrupt Distributor, which receives interrupts
   8  *   from system devices and sends them to the Interrupt Controllers.
   9  *
  10  * o There is one CPU Interface per CPU, which sends interrupts sent
  11  *   by the Distributor, and interrupts generated locally, to the
  12  *   associated CPU. The base address of the CPU interface is usually
  13  *   aliased so that the same address points to different chips depending
  14  *   on the CPU it is accessed from.
  15  *
  16  * Note that IRQs 0-31 are special - they are local to each CPU.
  17  * As such, the enable set/clear, pending set/clear and active bit
  18  * registers are banked per-cpu for these sources.
  19  */
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/err.h>
  23 #include <linux/module.h>
  24 #include <linux/list.h>
  25 #include <linux/smp.h>
  26 #include <linux/cpu.h>
  27 #include <linux/cpu_pm.h>
  28 #include <linux/cpumask.h>
  29 #include <linux/io.h>
  30 #include <linux/of.h>
  31 #include <linux/of_address.h>
  32 #include <linux/of_irq.h>
  33 #include <linux/acpi.h>
  34 #include <linux/irqdomain.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/percpu.h>
  37 #include <linux/slab.h>
  38 #include <linux/irqchip.h>
  39 #include <linux/irqchip/chained_irq.h>
  40 #include <linux/irqchip/arm-gic.h>
  41
  42 #include <asm/cputype.h>
  43 #include <asm/irq.h>
  44 #include <asm/exception.h>
  45 #include <asm/smp_plat.h>
  46 #include <asm/virt.h>
  47
  48 #include "irq-gic-common.h"
  49
  50 #ifdef CONFIG_ARM64
  51 #include <asm/cpufeature.h>
  52
  53 static void gic_check_cpu_features(void)
  54 {
  55         WARN_TAINT_ONCE(this_cpu_has_cap(ARM64_HAS_SYSREG_GIC_CPUIF),
  56                         TAINT_CPU_OUT_OF_SPEC,
  57                         "GICv3 system registers enabled, broken firmware!\n");
  58 }
  59 #else
  60 #define gic_check_cpu_features()        do { } while(0)
  61 #endif
  62
  63 union gic_base {
  64         void __iomem *common_base;
  65         void __percpu * __iomem *percpu_base;
  66 };
  67
  68 struct gic_chip_data {
  69         struct irq_chip chip;
  70         union gic_base dist_base;
  71         union gic_base cpu_base;
  72         void __iomem *raw_dist_base;
  73         void __iomem *raw_cpu_base;
  74         u32 percpu_offset;
  75 #if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM)
  76         u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
  77         u32 saved_spi_active[DIV_ROUND_UP(1020, 32)];
  78         u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
  79         u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
  80         u32 __percpu *saved_ppi_enable;
  81         u32 __percpu *saved_ppi_active;
  82         u32 __percpu *saved_ppi_conf;
  83 #endif
  84         struct irq_domain *domain;
  85         unsigned int gic_irqs;
  86 #ifdef CONFIG_GIC_NON_BANKED
  87         void __iomem *(*get_base)(union gic_base *);
  88 #endif
  89 };
  90
  91 #ifdef CONFIG_BL_SWITCHER
  92
  93 static DEFINE_RAW_SPINLOCK(cpu_map_lock);
  94
  95 #define gic_lock_irqsave(f)             \
  96         raw_spin_lock_irqsave(&cpu_map_lock, (f))
  97 #define gic_unlock_irqrestore(f)        \
  98         raw_spin_unlock_irqrestore(&cpu_map_lock, (f))
  99
 100 #define gic_lock()                      raw_spin_lock(&cpu_map_lock)
 101 #define gic_unlock()                    raw_spin_unlock(&cpu_map_lock)
 102
 103 #else
 104
 105 #define gic_lock_irqsave(f)             do { (void)(f); } while(0)
 106 #define gic_unlock_irqrestore(f)        do { (void)(f); } while(0)
 107
 108 #define gic_lock()                      do { } while(0)
 109 #define gic_unlock()                    do { } while(0)
 110
 111 #endif
 112
 113 /*
 114  * The GIC mapping of CPU interfaces does not necessarily match
 115  * the logical CPU numbering.  Let's use a mapping as returned
 116  * by the GIC itself.
 117  */
 118 #define NR_GIC_CPU_IF 8
 119 static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
 120
 121 static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
 122
 123 static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly;
 124
 125 static struct gic_kvm_info gic_v2_kvm_info;
 126
 127 #ifdef CONFIG_GIC_NON_BANKED
 128 static void __iomem *gic_get_percpu_base(union gic_base *base)
 129 {
 130         return raw_cpu_read(*base->percpu_base);
 131 }
 132
 133 static void __iomem *gic_get_common_base(union gic_base *base)
 134 {
 135         return base->common_base;
 136 }
 137
 138 static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
 139 {
 140         return data->get_base(&data->dist_base);
 141 }
 142
 143 static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
 144 {
 145         return data->get_base(&data->cpu_base);
 146 }
 147
 148 static inline void gic_set_base_accessor(struct gic_chip_data *data,
 149                                          void __iomem *(*f)(union gic_base *))
 150 {
 151         data->get_base = f;
 152 }
 153 #else
 154 #define gic_data_dist_base(d)   ((d)->dist_base.common_base)
 155 #define gic_data_cpu_base(d)    ((d)->cpu_base.common_base)
 156 #define gic_set_base_accessor(d, f)
 157 #endif
 158
 159 static inline void __iomem *gic_dist_base(struct irq_data *d)
 160 {
 161         struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
 162         return gic_data_dist_base(gic_data);
 163 }
 164
 165 static inline void __iomem *gic_cpu_base(struct irq_data *d)
 166 {
 167         struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
 168         return gic_data_cpu_base(gic_data);
 169 }
 170
 171 static inline unsigned int gic_irq(struct irq_data *d)
 172 {
 173         return d->hwirq;
 174 }
 175
 176 static inline bool cascading_gic_irq(struct irq_data *d)
 177 {
 178         void *data = irq_data_get_irq_handler_data(d);
 179
 180         /*
 181          * If handler_data is set, this is a cascading interrupt, and
 182          * it cannot possibly be forwarded.
 183          */
 184         return data != NULL;
 185 }
 186
 187 /*
 188  * Routines to acknowledge, disable and enable interrupts
 189  */
 190 static void gic_poke_irq(struct irq_data *d, u32 offset)
 191 {
 192         u32 mask = 1 << (gic_irq(d) % 32);
 193         writel_relaxed(mask, gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4);
 194 }
 195
 196 static int gic_peek_irq(struct irq_data *d, u32 offset)
 197 {
 198         u32 mask = 1 << (gic_irq(d) % 32);
 199         return !!(readl_relaxed(gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4) & mask);
 200 }
 201
 202 static void gic_mask_irq(struct irq_data *d)
 203 {
 204         gic_poke_irq(d, GIC_DIST_ENABLE_CLEAR);
 205 }
 206
 207 static void gic_eoimode1_mask_irq(struct irq_data *d)
 208 {
 209         gic_mask_irq(d);
 210         /*
 211          * When masking a forwarded interrupt, make sure it is
 212          * deactivated as well.
 213          *
 214          * This ensures that an interrupt that is getting
 215          * disabled/masked will not get "stuck", because there is
 216          * noone to deactivate it (guest is being terminated).
 217          */
 218         if (irqd_is_forwarded_to_vcpu(d))
 219                 gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR);
 220 }
 221
 222 static void gic_unmask_irq(struct irq_data *d)
 223 {
 224         gic_poke_irq(d, GIC_DIST_ENABLE_SET);
 225 }
 226
 227 static void gic_eoi_irq(struct irq_data *d)
 228 {
 229         writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
 230 }
 231
 232 static void gic_eoimode1_eoi_irq(struct irq_data *d)
 233 {
 234         /* Do not deactivate an IRQ forwarded to a vcpu. */
 235         if (irqd_is_forwarded_to_vcpu(d))
 236                 return;
 237
 238         writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_DEACTIVATE);
 239 }
 240
 241 static int gic_irq_set_irqchip_state(struct irq_data *d,
 242                                      enum irqchip_irq_state which, bool val)
 243 {
 244         u32 reg;
 245
 246         switch (which) {
 247         case IRQCHIP_STATE_PENDING:
 248                 reg = val ? GIC_DIST_PENDING_SET : GIC_DIST_PENDING_CLEAR;
 249                 break;
 250
 251         case IRQCHIP_STATE_ACTIVE:
 252                 reg = val ? GIC_DIST_ACTIVE_SET : GIC_DIST_ACTIVE_CLEAR;
 253                 break;
 254
 255         case IRQCHIP_STATE_MASKED:
 256                 reg = val ? GIC_DIST_ENABLE_CLEAR : GIC_DIST_ENABLE_SET;
 257                 break;
 258
 259         default:
 260                 return -EINVAL;
 261         }
 262
 263         gic_poke_irq(d, reg);
 264         return 0;
 265 }
 266
 267 static int gic_irq_get_irqchip_state(struct irq_data *d,
 268                                       enum irqchip_irq_state which, bool *val)
 269 {
 270         switch (which) {
 271         case IRQCHIP_STATE_PENDING:
 272                 *val = gic_peek_irq(d, GIC_DIST_PENDING_SET);
 273                 break;
 274
 275         case IRQCHIP_STATE_ACTIVE:
 276                 *val = gic_peek_irq(d, GIC_DIST_ACTIVE_SET);
 277                 break;
 278
 279         case IRQCHIP_STATE_MASKED:
 280                 *val = !gic_peek_irq(d, GIC_DIST_ENABLE_SET);
 281                 break;
 282
 283         default:
 284                 return -EINVAL;
 285         }
 286
 287         return 0;
 288 }
 289
 290 static int gic_set_type(struct irq_data *d, unsigned int type)
 291 {
 292         void __iomem *base = gic_dist_base(d);
 293         unsigned int gicirq = gic_irq(d);
 294         int ret;
 295
 296         /* Interrupt configuration for SGIs can't be changed */
 297         if (gicirq < 16)
 298                 return -EINVAL;
 299
 300         /* SPIs have restrictions on the supported types */
 301         if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
 302                             type != IRQ_TYPE_EDGE_RISING)
 303                 return -EINVAL;
 304
 305         ret = gic_configure_irq(gicirq, type, base + GIC_DIST_CONFIG, NULL);
 306         if (ret && gicirq < 32) {
 307                 /* Misconfigured PPIs are usually not fatal */
 308                 pr_warn("GIC: PPI%d is secure or misconfigured\n", gicirq - 16);
 309                 ret = 0;
 310         }
 311
 312         return ret;
 313 }
 314
 315 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
 316 {
 317         /* Only interrupts on the primary GIC can be forwarded to a vcpu. */
 318         if (cascading_gic_irq(d))
 319                 return -EINVAL;
 320
 321         if (vcpu)
 322                 irqd_set_forwarded_to_vcpu(d);
 323         else
 324                 irqd_clr_forwarded_to_vcpu(d);
 325         return 0;
 326 }
 327
 328 #ifdef CONFIG_SMP
 329 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 330                             bool force)
 331 {
 332         void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3);
 333         unsigned int cpu, shift = (gic_irq(d) % 4) * 8;
 334         u32 val, mask, bit;
 335         unsigned long flags;
 336
 337         if (!force)
 338                 cpu = cpumask_any_and(mask_val, cpu_online_mask);
 339         else
 340                 cpu = cpumask_first(mask_val);
 341
 342         if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
 343                 return -EINVAL;
 344
 345         gic_lock_irqsave(flags);
 346         mask = 0xff << shift;
 347         bit = gic_cpu_map[cpu] << shift;
 348         val = readl_relaxed(reg) & ~mask;
 349         writel_relaxed(val | bit, reg);
 350         gic_unlock_irqrestore(flags);
 351
 352         irq_data_update_effective_affinity(d, cpumask_of(cpu));
 353
 354         return IRQ_SET_MASK_OK_DONE;
 355 }
 356 #endif
 357
 358 static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 359 {
 360         u32 irqstat, irqnr;
 361         struct gic_chip_data *gic = &gic_data[0];
 362         void __iomem *cpu_base = gic_data_cpu_base(gic);
 363
 364         do {
 365                 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
 366                 irqnr = irqstat & GICC_IAR_INT_ID_MASK;
 367
 368                 if (likely(irqnr > 15 && irqnr < 1020)) {
 369                         if (static_branch_likely(&supports_deactivate_key))
 370                                 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
 371                         isb();
 372                         handle_domain_irq(gic->domain, irqnr, regs);
 373                         continue;
 374                 }
 375                 if (irqnr < 16) {
 376                         writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
 377                         if (static_branch_likely(&supports_deactivate_key))
 378                                 writel_relaxed(irqstat, cpu_base + GIC_CPU_DEACTIVATE);
 379 #ifdef CONFIG_SMP
 380                         /*
 381                          * Ensure any shared data written by the CPU sending
 382                          * the IPI is read after we've read the ACK register
 383                          * on the GIC.
 384                          *
 385                          * Pairs with the write barrier in gic_raise_softirq
 386                          */
 387                         smp_rmb();
 388                         handle_IPI(irqnr, regs);
 389 #endif
 390                         continue;
 391                 }
 392                 break;
 393         } while (1);
 394 }
 395
 396 static void gic_handle_cascade_irq(struct irq_desc *desc)
 397 {
 398         struct gic_chip_data *chip_data = irq_desc_get_handler_data(desc);
 399         struct irq_chip *chip = irq_desc_get_chip(desc);
 400         unsigned int cascade_irq, gic_irq;
 401         unsigned long status;
 402
 403         chained_irq_enter(chip, desc);
 404
 405         status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
 406
 407         gic_irq = (status & GICC_IAR_INT_ID_MASK);
 408         if (gic_irq == GICC_INT_SPURIOUS)
 409                 goto out;
 410
 411         cascade_irq = irq_find_mapping(chip_data->domain, gic_irq);
 412         if (unlikely(gic_irq < 32 || gic_irq > 1020)) {
 413                 handle_bad_irq(desc);
 414         } else {
 415                 isb();
 416                 generic_handle_irq(cascade_irq);
 417         }
 418
 419  out:
 420         chained_irq_exit(chip, desc);
 421 }
 422
 423 static const struct irq_chip gic_chip = {
 424         .irq_mask               = gic_mask_irq,
 425         .irq_unmask             = gic_unmask_irq,
 426         .irq_eoi                = gic_eoi_irq,
 427         .irq_set_type           = gic_set_type,
 428         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
 429         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 430         .flags                  = IRQCHIP_SET_TYPE_MASKED |
 431                                   IRQCHIP_SKIP_SET_WAKE |
 432                                   IRQCHIP_MASK_ON_SUSPEND,
 433 };
 434
 435 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
 436 {
 437         BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
 438         irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq,
 439                                          &gic_data[gic_nr]);
 440 }
 441
 442 static u8 gic_get_cpumask(struct gic_chip_data *gic)
 443 {
 444         void __iomem *base = gic_data_dist_base(gic);
 445         u32 mask, i;
 446
 447         for (i = mask = 0; i < 32; i += 4) {
 448                 mask = readl_relaxed(base + GIC_DIST_TARGET + i);
 449                 mask |= mask >> 16;
 450                 mask |= mask >> 8;
 451                 if (mask)
 452                         break;
 453         }
 454
 455         if (!mask && num_possible_cpus() > 1)
 456                 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
 457
 458         return mask;
 459 }
 460
 461 static bool gic_check_gicv2(void __iomem *base)
 462 {
 463         u32 val = readl_relaxed(base + GIC_CPU_IDENT);
 464         return (val & 0xff0fff) == 0x02043B;
 465 }
 466
 467 static void gic_cpu_if_up(struct gic_chip_data *gic)
 468 {
 469         void __iomem *cpu_base = gic_data_cpu_base(gic);
 470         u32 bypass = 0;
 471         u32 mode = 0;
 472         int i;
 473
 474         if (gic == &gic_data[0] && static_branch_likely(&supports_deactivate_key))
 475                 mode = GIC_CPU_CTRL_EOImodeNS;
 476
 477         if (gic_check_gicv2(cpu_base))
 478                 for (i = 0; i < 4; i++)
 479                         writel_relaxed(0, cpu_base + GIC_CPU_ACTIVEPRIO + i * 4);
 480
 481         /*
 482         * Preserve bypass disable bits to be written back later
 483         */
 484         bypass = readl(cpu_base + GIC_CPU_CTRL);
 485         bypass &= GICC_DIS_BYPASS_MASK;
 486
 487         writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL);
 488 }
 489
 490
 491 static void gic_dist_init(struct gic_chip_data *gic)
 492 {
 493         unsigned int i;
 494         u32 cpumask;
 495         unsigned int gic_irqs = gic->gic_irqs;
 496         void __iomem *base = gic_data_dist_base(gic);
 497
 498         writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL);
 499
 500         /*
 501          * Set all global interrupts to this CPU only.
 502          */
 503         cpumask = gic_get_cpumask(gic);
 504         cpumask |= cpumask << 8;
 505         cpumask |= cpumask << 16;
 506         for (i = 32; i < gic_irqs; i += 4)
 507                 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
 508
 509         gic_dist_config(base, gic_irqs, NULL);
 510
 511         writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
 512 }
 513
 514 static int gic_cpu_init(struct gic_chip_data *gic)
 515 {
 516         void __iomem *dist_base = gic_data_dist_base(gic);
 517         void __iomem *base = gic_data_cpu_base(gic);
 518         unsigned int cpu_mask, cpu = smp_processor_id();
 519         int i;
 520
 521         /*
 522          * Setting up the CPU map is only relevant for the primary GIC
 523          * because any nested/secondary GICs do not directly interface
 524          * with the CPU(s).
 525          */
 526         if (gic == &gic_data[0]) {
 527                 /*
 528                  * Get what the GIC says our CPU mask is.
 529                  */
 530                 if (WARN_ON(cpu >= NR_GIC_CPU_IF))
 531                         return -EINVAL;
 532
 533                 gic_check_cpu_features();
 534                 cpu_mask = gic_get_cpumask(gic);
 535                 gic_cpu_map[cpu] = cpu_mask;
 536
 537                 /*
 538                  * Clear our mask from the other map entries in case they're
 539                  * still undefined.
 540                  */
 541                 for (i = 0; i < NR_GIC_CPU_IF; i++)
 542                         if (i != cpu)
 543                                 gic_cpu_map[i] &= ~cpu_mask;
 544         }
 545
 546         gic_cpu_config(dist_base, 32, NULL);
 547
 548         writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
 549         gic_cpu_if_up(gic);
 550
 551         return 0;
 552 }
 553
 554 int gic_cpu_if_down(unsigned int gic_nr)
 555 {
 556         void __iomem *cpu_base;
 557         u32 val = 0;
 558
 559         if (gic_nr >= CONFIG_ARM_GIC_MAX_NR)
 560                 return -EINVAL;
 561
 562         cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
 563         val = readl(cpu_base + GIC_CPU_CTRL);
 564         val &= ~GICC_ENABLE;
 565         writel_relaxed(val, cpu_base + GIC_CPU_CTRL);
 566
 567         return 0;
 568 }
 569
 570 #if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM)
 571 /*
 572  * Saves the GIC distributor registers during suspend or idle.  Must be called
 573  * with interrupts disabled but before powering down the GIC.  After calling
 574  * this function, no interrupts will be delivered by the GIC, and another
 575  * platform-specific wakeup source must be enabled.
 576  */
 577 void gic_dist_save(struct gic_chip_data *gic)
 578 {
 579         unsigned int gic_irqs;
 580         void __iomem *dist_base;
 581         int i;
 582
 583         if (WARN_ON(!gic))
 584                 return;
 585
 586         gic_irqs = gic->gic_irqs;
 587         dist_base = gic_data_dist_base(gic);
 588
 589         if (!dist_base)
 590                 return;
 591
 592         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
 593                 gic->saved_spi_conf[i] =
 594                         readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
 595
 596         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
 597                 gic->saved_spi_target[i] =
 598                         readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
 599
 600         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
 601                 gic->saved_spi_enable[i] =
 602                         readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
 603
 604         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
 605                 gic->saved_spi_active[i] =
 606                         readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 607 }
 608
 609 /*
 610  * Restores the GIC distributor registers during resume or when coming out of
 611  * idle.  Must be called before enabling interrupts.  If a level interrupt
 612  * that occurred while the GIC was suspended is still present, it will be
 613  * handled normally, but any edge interrupts that occurred will not be seen by
 614  * the GIC and need to be handled by the platform-specific wakeup source.
 615  */
 616 void gic_dist_restore(struct gic_chip_data *gic)
 617 {
 618         unsigned int gic_irqs;
 619         unsigned int i;
 620         void __iomem *dist_base;
 621
 622         if (WARN_ON(!gic))
 623                 return;
 624
 625         gic_irqs = gic->gic_irqs;
 626         dist_base = gic_data_dist_base(gic);
 627
 628         if (!dist_base)
 629                 return;
 630
 631         writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
 632
 633         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
 634                 writel_relaxed(gic->saved_spi_conf[i],
 635                         dist_base + GIC_DIST_CONFIG + i * 4);
 636
 637         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
 638                 writel_relaxed(GICD_INT_DEF_PRI_X4,
 639                         dist_base + GIC_DIST_PRI + i * 4);
 640
 641         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
 642                 writel_relaxed(gic->saved_spi_target[i],
 643                         dist_base + GIC_DIST_TARGET + i * 4);
 644
 645         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
 646                 writel_relaxed(GICD_INT_EN_CLR_X32,
 647                         dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
 648                 writel_relaxed(gic->saved_spi_enable[i],
 649                         dist_base + GIC_DIST_ENABLE_SET + i * 4);
 650         }
 651
 652         for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
 653                 writel_relaxed(GICD_INT_EN_CLR_X32,
 654                         dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
 655                 writel_relaxed(gic->saved_spi_active[i],
 656                         dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 657         }
 658
 659         writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
 660 }
 661
 662 void gic_cpu_save(struct gic_chip_data *gic)
 663 {
 664         int i;
 665         u32 *ptr;
 666         void __iomem *dist_base;
 667         void __iomem *cpu_base;
 668
 669         if (WARN_ON(!gic))
 670                 return;
 671
 672         dist_base = gic_data_dist_base(gic);
 673         cpu_base = gic_data_cpu_base(gic);
 674
 675         if (!dist_base || !cpu_base)
 676                 return;
 677
 678         ptr = raw_cpu_ptr(gic->saved_ppi_enable);
 679         for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
 680                 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
 681
 682         ptr = raw_cpu_ptr(gic->saved_ppi_active);
 683         for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
 684                 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 685
 686         ptr = raw_cpu_ptr(gic->saved_ppi_conf);
 687         for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
 688                 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
 689
 690 }
 691
 692 void gic_cpu_restore(struct gic_chip_data *gic)
 693 {
 694         int i;
 695         u32 *ptr;
 696         void __iomem *dist_base;
 697         void __iomem *cpu_base;
 698
 699         if (WARN_ON(!gic))
 700                 return;
 701
 702         dist_base = gic_data_dist_base(gic);
 703         cpu_base = gic_data_cpu_base(gic);
 704
 705         if (!dist_base || !cpu_base)
 706                 return;
 707
 708         ptr = raw_cpu_ptr(gic->saved_ppi_enable);
 709         for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
 710                 writel_relaxed(GICD_INT_EN_CLR_X32,
 711                                dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
 712                 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
 713         }
 714
 715         ptr = raw_cpu_ptr(gic->saved_ppi_active);
 716         for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
 717                 writel_relaxed(GICD_INT_EN_CLR_X32,
 718                                dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
 719                 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 720         }
 721
 722         ptr = raw_cpu_ptr(gic->saved_ppi_conf);
 723         for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
 724                 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
 725
 726         for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
 727                 writel_relaxed(GICD_INT_DEF_PRI_X4,
 728                                         dist_base + GIC_DIST_PRI + i * 4);
 729
 730         writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
 731         gic_cpu_if_up(gic);
 732 }
 733
 734 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v)
 735 {
 736         int i;
 737
 738         for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) {
 739 #ifdef CONFIG_GIC_NON_BANKED
 740                 /* Skip over unused GICs */
 741                 if (!gic_data[i].get_base)
 742                         continue;
 743 #endif
 744                 switch (cmd) {
 745                 case CPU_PM_ENTER:
 746                         gic_cpu_save(&gic_data[i]);
 747                         break;
 748                 case CPU_PM_ENTER_FAILED:
 749                 case CPU_PM_EXIT:
 750                         gic_cpu_restore(&gic_data[i]);
 751                         break;
 752                 case CPU_CLUSTER_PM_ENTER:
 753                         gic_dist_save(&gic_data[i]);
 754                         break;
 755                 case CPU_CLUSTER_PM_ENTER_FAILED:
 756                 case CPU_CLUSTER_PM_EXIT:
 757                         gic_dist_restore(&gic_data[i]);
 758                         break;
 759                 }
 760         }
 761
 762         return NOTIFY_OK;
 763 }
 764
 765 static struct notifier_block gic_notifier_block = {
 766         .notifier_call = gic_notifier,
 767 };
 768
 769 static int gic_pm_init(struct gic_chip_data *gic)
 770 {
 771         gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
 772                 sizeof(u32));
 773         if (WARN_ON(!gic->saved_ppi_enable))
 774                 return -ENOMEM;
 775
 776         gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
 777                 sizeof(u32));
 778         if (WARN_ON(!gic->saved_ppi_active))
 779                 goto free_ppi_enable;
 780
 781         gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
 782                 sizeof(u32));
 783         if (WARN_ON(!gic->saved_ppi_conf))
 784                 goto free_ppi_active;
 785
 786         if (gic == &gic_data[0])
 787                 cpu_pm_register_notifier(&gic_notifier_block);
 788
 789         return 0;
 790
 791 free_ppi_active:
 792         free_percpu(gic->saved_ppi_active);
 793 free_ppi_enable:
 794         free_percpu(gic->saved_ppi_enable);
 795
 796         return -ENOMEM;
 797 }
 798 #else
 799 static int gic_pm_init(struct gic_chip_data *gic)
 800 {
 801         return 0;
 802 }
 803 #endif
 804
 805 #ifdef CONFIG_SMP
 806 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 807 {
 808         int cpu;
 809         unsigned long flags, map = 0;
 810
 811         if (unlikely(nr_cpu_ids == 1)) {
 812                 /* Only one CPU? let's do a self-IPI... */
 813                 writel_relaxed(2 << 24 | irq,
 814                                gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
 815                 return;
 816         }
 817
 818         gic_lock_irqsave(flags);
 819
 820         /* Convert our logical CPU mask into a physical one. */
 821         for_each_cpu(cpu, mask)
 822                 map |= gic_cpu_map[cpu];
 823
 824         /*
 825          * Ensure that stores to Normal memory are visible to the
 826          * other CPUs before they observe us issuing the IPI.
 827          */
 828         dmb(ishst);
 829
 830         /* this always happens on GIC0 */
 831         writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
 832
 833         gic_unlock_irqrestore(flags);
 834 }
 835 #endif
 836
 837 #ifdef CONFIG_BL_SWITCHER
 838 /*
 839  * gic_send_sgi - send a SGI directly to given CPU interface number
 840  *
 841  * cpu_id: the ID for the destination CPU interface
 842  * irq: the IPI number to send a SGI for
 843  */
 844 void gic_send_sgi(unsigned int cpu_id, unsigned int irq)
 845 {
 846         BUG_ON(cpu_id >= NR_GIC_CPU_IF);
 847         cpu_id = 1 << cpu_id;
 848         /* this always happens on GIC0 */
 849         writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
 850 }
 851
 852 /*
 853  * gic_get_cpu_id - get the CPU interface ID for the specified CPU
 854  *
 855  * @cpu: the logical CPU number to get the GIC ID for.
 856  *
 857  * Return the CPU interface ID for the given logical CPU number,
 858  * or -1 if the CPU number is too large or the interface ID is
 859  * unknown (more than one bit set).
 860  */
 861 int gic_get_cpu_id(unsigned int cpu)
 862 {
 863         unsigned int cpu_bit;
 864
 865         if (cpu >= NR_GIC_CPU_IF)
 866                 return -1;
 867         cpu_bit = gic_cpu_map[cpu];
 868         if (cpu_bit & (cpu_bit - 1))
 869                 return -1;
 870         return __ffs(cpu_bit);
 871 }
 872
 873 /*
 874  * gic_migrate_target - migrate IRQs to another CPU interface
 875  *
 876  * @new_cpu_id: the CPU target ID to migrate IRQs to
 877  *
 878  * Migrate all peripheral interrupts with a target matching the current CPU
 879  * to the interface corresponding to @new_cpu_id.  The CPU interface mapping
 880  * is also updated.  Targets to other CPU interfaces are unchanged.
 881  * This must be called with IRQs locally disabled.
 882  */
 883 void gic_migrate_target(unsigned int new_cpu_id)
 884 {
 885         unsigned int cur_cpu_id, gic_irqs, gic_nr = 0;
 886         void __iomem *dist_base;
 887         int i, ror_val, cpu = smp_processor_id();
 888         u32 val, cur_target_mask, active_mask;
 889
 890         BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
 891
 892         dist_base = gic_data_dist_base(&gic_data[gic_nr]);
 893         if (!dist_base)
 894                 return;
 895         gic_irqs = gic_data[gic_nr].gic_irqs;
 896
 897         cur_cpu_id = __ffs(gic_cpu_map[cpu]);
 898         cur_target_mask = 0x01010101 << cur_cpu_id;
 899         ror_val = (cur_cpu_id - new_cpu_id) & 31;
 900
 901         gic_lock();
 902
 903         /* Update the target interface for this logical CPU */
 904         gic_cpu_map[cpu] = 1 << new_cpu_id;
 905
 906         /*
 907          * Find all the peripheral interrupts targeting the current
 908          * CPU interface and migrate them to the new CPU interface.
 909          * We skip DIST_TARGET 0 to 7 as they are read-only.
 910          */
 911         for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) {
 912                 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
 913                 active_mask = val & cur_target_mask;
 914                 if (active_mask) {
 915                         val &= ~active_mask;
 916                         val |= ror32(active_mask, ror_val);
 917                         writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4);
 918                 }
 919         }
 920
 921         gic_unlock();
 922
 923         /*
 924          * Now let's migrate and clear any potential SGIs that might be
 925          * pending for us (cur_cpu_id).  Since GIC_DIST_SGI_PENDING_SET
 926          * is a banked register, we can only forward the SGI using
 927          * GIC_DIST_SOFTINT.  The original SGI source is lost but Linux
 928          * doesn't use that information anyway.
 929          *
 930          * For the same reason we do not adjust SGI source information
 931          * for previously sent SGIs by us to other CPUs either.
 932          */
 933         for (i = 0; i < 16; i += 4) {
 934                 int j;
 935                 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i);
 936                 if (!val)
 937                         continue;
 938                 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i);
 939                 for (j = i; j < i + 4; j++) {
 940                         if (val & 0xff)
 941                                 writel_relaxed((1 << (new_cpu_id + 16)) | j,
 942                                                 dist_base + GIC_DIST_SOFTINT);
 943                         val >>= 8;
 944                 }
 945         }
 946 }
 947
 948 /*
 949  * gic_get_sgir_physaddr - get the physical address for the SGI register
 950  *
 951  * REturn the physical address of the SGI register to be used
 952  * by some early assembly code when the kernel is not yet available.
 953  */
 954 static unsigned long gic_dist_physaddr;
 955
 956 unsigned long gic_get_sgir_physaddr(void)
 957 {
 958         if (!gic_dist_physaddr)
 959                 return 0;
 960         return gic_dist_physaddr + GIC_DIST_SOFTINT;
 961 }
 962
 963 static void __init gic_init_physaddr(struct device_node *node)
 964 {
 965         struct resource res;
 966         if (of_address_to_resource(node, 0, &res) == 0) {
 967                 gic_dist_physaddr = res.start;
 968                 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
 969         }
 970 }
 971
 972 #else
 973 #define gic_init_physaddr(node)  do { } while (0)
 974 #endif
 975
 976 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
 977                                 irq_hw_number_t hw)
 978 {
 979         struct gic_chip_data *gic = d->host_data;
 980
 981         if (hw < 32) {
 982                 irq_set_percpu_devid(irq);
 983                 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
 984                                     handle_percpu_devid_irq, NULL, NULL);
 985                 irq_set_status_flags(irq, IRQ_NOAUTOEN);
 986         } else {
 987                 irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
 988                                     handle_fasteoi_irq, NULL, NULL);
 989                 irq_set_probe(irq);
 990                 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
 991         }
 992         return 0;
 993 }
 994
 995 static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
 996 {
 997 }
 998
 999 static int gic_irq_domain_translate(struct irq_domain *d,
1000                                     struct irq_fwspec *fwspec,
1001                                     unsigned long *hwirq,
1002                                     unsigned int *type)
1003 {
1004         if (is_of_node(fwspec->fwnode)) {
1005                 if (fwspec->param_count < 3)
1006                         return -EINVAL;
1007
1008                 /* Get the interrupt number and add 16 to skip over SGIs */
1009                 *hwirq = fwspec->param[1] + 16;
1010
1011                 /*
1012                  * For SPIs, we need to add 16 more to get the GIC irq
1013                  * ID number
1014                  */
1015                 if (!fwspec->param[0])
1016                         *hwirq += 16;
1017
1018                 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1019
1020                 /* Make it clear that broken DTs are... broken */
1021                 WARN_ON(*type == IRQ_TYPE_NONE);
1022                 return 0;
1023         }
1024
1025         if (is_fwnode_irqchip(fwspec->fwnode)) {
1026                 if(fwspec->param_count != 2)
1027                         return -EINVAL;
1028
1029                 *hwirq = fwspec->param[0];
1030                 *type = fwspec->param[1];
1031
1032                 WARN_ON(*type == IRQ_TYPE_NONE);
1033                 return 0;
1034         }
1035
1036         return -EINVAL;
1037 }
1038
1039 static int gic_starting_cpu(unsigned int cpu)
1040 {
1041         gic_cpu_init(&gic_data[0]);
1042         return 0;
1043 }
1044
1045 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
1046                                 unsigned int nr_irqs, void *arg)
1047 {
1048         int i, ret;
1049         irq_hw_number_t hwirq;
1050         unsigned int type = IRQ_TYPE_NONE;
1051         struct irq_fwspec *fwspec = arg;
1052
1053         ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
1054         if (ret)
1055                 return ret;
1056
1057         for (i = 0; i < nr_irqs; i++) {
1058                 ret = gic_irq_domain_map(domain, virq + i, hwirq + i);
1059                 if (ret)
1060                         return ret;
1061         }
1062
1063         return 0;
1064 }
1065
1066 static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
1067         .translate = gic_irq_domain_translate,
1068         .alloc = gic_irq_domain_alloc,
1069         .free = irq_domain_free_irqs_top,
1070 };
1071
1072 static const struct irq_domain_ops gic_irq_domain_ops = {
1073         .map = gic_irq_domain_map,
1074         .unmap = gic_irq_domain_unmap,
1075 };
1076
1077 static void gic_init_chip(struct gic_chip_data *gic, struct device *dev,
1078                           const char *name, bool use_eoimode1)
1079 {
1080         /* Initialize irq_chip */
1081         gic->chip = gic_chip;
1082         gic->chip.name = name;
1083         gic->chip.parent_device = dev;
1084
1085         if (use_eoimode1) {
1086                 gic->chip.irq_mask = gic_eoimode1_mask_irq;
1087                 gic->chip.irq_eoi = gic_eoimode1_eoi_irq;
1088                 gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity;
1089         }
1090
1091 #ifdef CONFIG_SMP
1092         if (gic == &gic_data[0])
1093                 gic->chip.irq_set_affinity = gic_set_affinity;
1094 #endif
1095 }
1096
1097 static int gic_init_bases(struct gic_chip_data *gic,
1098                           struct fwnode_handle *handle)
1099 {
1100         int gic_irqs, ret;
1101
1102         if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
1103                 /* Frankein-GIC without banked registers... */
1104                 unsigned int cpu;
1105
1106                 gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
1107                 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
1108                 if (WARN_ON(!gic->dist_base.percpu_base ||
1109                             !gic->cpu_base.percpu_base)) {
1110                         ret = -ENOMEM;
1111                         goto error;
1112                 }
1113
1114                 for_each_possible_cpu(cpu) {
1115                         u32 mpidr = cpu_logical_map(cpu);
1116                         u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
1117                         unsigned long offset = gic->percpu_offset * core_id;
1118                         *per_cpu_ptr(gic->dist_base.percpu_base, cpu) =
1119                                 gic->raw_dist_base + offset;
1120                         *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) =
1121                                 gic->raw_cpu_base + offset;
1122                 }
1123
1124                 gic_set_base_accessor(gic, gic_get_percpu_base);
1125         } else {
1126                 /* Normal, sane GIC... */
1127                 WARN(gic->percpu_offset,
1128                      "GIC_NON_BANKED not enabled, ignoring %08x offset!",
1129                      gic->percpu_offset);
1130                 gic->dist_base.common_base = gic->raw_dist_base;
1131                 gic->cpu_base.common_base = gic->raw_cpu_base;
1132                 gic_set_base_accessor(gic, gic_get_common_base);
1133         }
1134
1135         /*
1136          * Find out how many interrupts are supported.
1137          * The GIC only supports up to 1020 interrupt sources.
1138          */
1139         gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
1140         gic_irqs = (gic_irqs + 1) * 32;
1141         if (gic_irqs > 1020)
1142                 gic_irqs = 1020;
1143         gic->gic_irqs = gic_irqs;
1144
1145         if (handle) {           /* DT/ACPI */
1146                 gic->domain = irq_domain_create_linear(handle, gic_irqs,
1147                                                        &gic_irq_domain_hierarchy_ops,
1148                                                        gic);
1149         } else {                /* Legacy support */
1150                 /*
1151                  * For primary GICs, skip over SGIs.
1152                  * No secondary GIC support whatsoever.
1153                  */
1154                 int irq_base;
1155
1156                 gic_irqs -= 16; /* calculate # of irqs to allocate */
1157
1158                 irq_base = irq_alloc_descs(16, 16, gic_irqs,
1159                                            numa_node_id());
1160                 if (irq_base < 0) {
1161                         WARN(1, "Cannot allocate irq_descs @ IRQ16, assuming pre-allocated\n");
1162                         irq_base = 16;
1163                 }
1164
1165                 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base,
1166                                                     16, &gic_irq_domain_ops, gic);
1167         }
1168
1169         if (WARN_ON(!gic->domain)) {
1170                 ret = -ENODEV;
1171                 goto error;
1172         }
1173
1174         gic_dist_init(gic);
1175         ret = gic_cpu_init(gic);
1176         if (ret)
1177                 goto error;
1178
1179         ret = gic_pm_init(gic);
1180         if (ret)
1181                 goto error;
1182
1183         return 0;
1184
1185 error:
1186         if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
1187                 free_percpu(gic->dist_base.percpu_base);
1188                 free_percpu(gic->cpu_base.percpu_base);
1189         }
1190
1191         return ret;
1192 }
1193
1194 static int __init __gic_init_bases(struct gic_chip_data *gic,
1195                                    struct fwnode_handle *handle)
1196 {
1197         char *name;
1198         int i, ret;
1199
1200         if (WARN_ON(!gic || gic->domain))
1201                 return -EINVAL;
1202
1203         if (gic == &gic_data[0]) {
1204                 /*
1205                  * Initialize the CPU interface map to all CPUs.
1206                  * It will be refined as each CPU probes its ID.
1207                  * This is only necessary for the primary GIC.
1208                  */
1209                 for (i = 0; i < NR_GIC_CPU_IF; i++)
1210                         gic_cpu_map[i] = 0xff;
1211 #ifdef CONFIG_SMP
1212                 set_smp_cross_call(gic_raise_softirq);
1213 #endif
1214                 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
1215                                           "irqchip/arm/gic:starting",
1216                                           gic_starting_cpu, NULL);
1217                 set_handle_irq(gic_handle_irq);
1218                 if (static_branch_likely(&supports_deactivate_key))
1219                         pr_info("GIC: Using split EOI/Deactivate mode\n");
1220         }
1221
1222         if (static_branch_likely(&supports_deactivate_key) && gic == &gic_data[0]) {
1223                 name = kasprintf(GFP_KERNEL, "GICv2");
1224                 gic_init_chip(gic, NULL, name, true);
1225         } else {
1226                 name = kasprintf(GFP_KERNEL, "GIC-%d", (int)(gic-&gic_data[0]));
1227                 gic_init_chip(gic, NULL, name, false);
1228         }
1229
1230         ret = gic_init_bases(gic, handle);
1231         if (ret)
1232                 kfree(name);
1233
1234         return ret;
1235 }
1236
1237 void __init gic_init(void __iomem *dist_base, void __iomem *cpu_base)
1238 {
1239         struct gic_chip_data *gic;
1240
1241         /*
1242          * Non-DT/ACPI systems won't run a hypervisor, so let's not
1243          * bother with these...
1244          */
1245         static_branch_disable(&supports_deactivate_key);
1246
1247         gic = &gic_data[0];
1248         gic->raw_dist_base = dist_base;
1249         gic->raw_cpu_base = cpu_base;
1250
1251         __gic_init_bases(gic, NULL);
1252 }
1253
1254 static void gic_teardown(struct gic_chip_data *gic)
1255 {
1256         if (WARN_ON(!gic))
1257                 return;
1258
1259         if (gic->raw_dist_base)
1260                 iounmap(gic->raw_dist_base);
1261         if (gic->raw_cpu_base)
1262                 iounmap(gic->raw_cpu_base);
1263 }
1264
1265 #ifdef CONFIG_OF
1266 static int gic_cnt __initdata;
1267 static bool gicv2_force_probe;
1268
1269 static int __init gicv2_force_probe_cfg(char *buf)
1270 {
1271         return strtobool(buf, &gicv2_force_probe);
1272 }
1273 early_param("irqchip.gicv2_force_probe", gicv2_force_probe_cfg);
1274
1275 static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
1276 {
1277         struct resource cpuif_res;
1278
1279         of_address_to_resource(node, 1, &cpuif_res);
1280
1281         if (!is_hyp_mode_available())
1282                 return false;
1283         if (resource_size(&cpuif_res) < SZ_8K) {
1284                 void __iomem *alt;
1285                 /*
1286                  * Check for a stupid firmware that only exposes the
1287                  * first page of a GICv2.
1288                  */
1289                 if (!gic_check_gicv2(*base))
1290                         return false;
1291
1292                 if (!gicv2_force_probe) {
1293                         pr_warn("GIC: GICv2 detected, but range too small and irqchip.gicv2_force_probe not set\n");
1294                         return false;
1295                 }
1296
1297                 alt = ioremap(cpuif_res.start, SZ_8K);
1298                 if (!alt)
1299                         return false;
1300                 if (!gic_check_gicv2(alt + SZ_4K)) {
1301                         /*
1302                          * The first page was that of a GICv2, and
1303                          * the second was *something*. Let's trust it
1304                          * to be a GICv2, and update the mapping.
1305                          */
1306                         pr_warn("GIC: GICv2 at %pa, but range is too small (broken DT?), assuming 8kB\n",
1307                                 &cpuif_res.start);
1308                         iounmap(*base);
1309                         *base = alt;
1310                         return true;
1311                 }
1312
1313                 /*
1314                  * We detected *two* initial GICv2 pages in a
1315                  * row. Could be a GICv2 aliased over two 64kB
1316                  * pages. Update the resource, map the iospace, and
1317                  * pray.
1318                  */
1319                 iounmap(alt);
1320                 alt = ioremap(cpuif_res.start, SZ_128K);
1321                 if (!alt)
1322                         return false;
1323                 pr_warn("GIC: Aliased GICv2 at %pa, trying to find the canonical range over 128kB\n",
1324                         &cpuif_res.start);
1325                 cpuif_res.end = cpuif_res.start + SZ_128K -1;
1326                 iounmap(*base);
1327                 *base = alt;
1328         }
1329         if (resource_size(&cpuif_res) == SZ_128K) {
1330                 /*
1331                  * Verify that we have the first 4kB of a GICv2
1332                  * aliased over the first 64kB by checking the
1333                  * GICC_IIDR register on both ends.
1334                  */
1335                 if (!gic_check_gicv2(*base) ||
1336                     !gic_check_gicv2(*base + 0xf000))
1337                         return false;
1338
1339                 /*
1340                  * Move the base up by 60kB, so that we have a 8kB
1341                  * contiguous region, which allows us to use GICC_DIR
1342                  * at its normal offset. Please pass me that bucket.
1343                  */
1344                 *base += 0xf000;
1345                 cpuif_res.start += 0xf000;
1346                 pr_warn("GIC: Adjusting CPU interface base to %pa\n",
1347                         &cpuif_res.start);
1348         }
1349
1350         return true;
1351 }
1352
1353 static int gic_of_setup(struct gic_chip_data *gic, struct device_node *node)
1354 {
1355         if (!gic || !node)
1356                 return -EINVAL;
1357
1358         gic->raw_dist_base = of_iomap(node, 0);
1359         if (WARN(!gic->raw_dist_base, "unable to map gic dist registers\n"))
1360                 goto error;
1361
1362         gic->raw_cpu_base = of_iomap(node, 1);
1363         if (WARN(!gic->raw_cpu_base, "unable to map gic cpu registers\n"))
1364                 goto error;
1365
1366         if (of_property_read_u32(node, "cpu-offset", &gic->percpu_offset))
1367                 gic->percpu_offset = 0;
1368
1369         return 0;
1370
1371 error:
1372         gic_teardown(gic);
1373
1374         return -ENOMEM;
1375 }
1376
1377 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq)
1378 {
1379         int ret;
1380
1381         if (!dev || !dev->of_node || !gic || !irq)
1382                 return -EINVAL;
1383
1384         *gic = devm_kzalloc(dev, sizeof(**gic), GFP_KERNEL);
1385         if (!*gic)
1386                 return -ENOMEM;
1387
1388         gic_init_chip(*gic, dev, dev->of_node->name, false);
1389
1390         ret = gic_of_setup(*gic, dev->of_node);
1391         if (ret)
1392                 return ret;
1393
1394         ret = gic_init_bases(*gic, &dev->of_node->fwnode);
1395         if (ret) {
1396                 gic_teardown(*gic);
1397                 return ret;
1398         }
1399
1400         irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq, *gic);
1401
1402         return 0;
1403 }
1404
1405 static void __init gic_of_setup_kvm_info(struct device_node *node)
1406 {
1407         int ret;
1408         struct resource *vctrl_res = &gic_v2_kvm_info.vctrl;
1409         struct resource *vcpu_res = &gic_v2_kvm_info.vcpu;
1410
1411         gic_v2_kvm_info.type = GIC_V2;
1412
1413         gic_v2_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1414         if (!gic_v2_kvm_info.maint_irq)
1415                 return;
1416
1417         ret = of_address_to_resource(node, 2, vctrl_res);
1418         if (ret)
1419                 return;
1420
1421         ret = of_address_to_resource(node, 3, vcpu_res);
1422         if (ret)
1423                 return;
1424
1425         if (static_branch_likely(&supports_deactivate_key))
1426                 gic_set_kvm_info(&gic_v2_kvm_info);
1427 }
1428
1429 int __init
1430 gic_of_init(struct device_node *node, struct device_node *parent)
1431 {
1432         struct gic_chip_data *gic;
1433         int irq, ret;
1434
1435         if (WARN_ON(!node))
1436                 return -ENODEV;
1437
1438         if (WARN_ON(gic_cnt >= CONFIG_ARM_GIC_MAX_NR))
1439                 return -EINVAL;
1440
1441         gic = &gic_data[gic_cnt];
1442
1443         ret = gic_of_setup(gic, node);
1444         if (ret)
1445                 return ret;
1446
1447         /*
1448          * Disable split EOI/Deactivate if either HYP is not available
1449          * or the CPU interface is too small.
1450          */
1451         if (gic_cnt == 0 && !gic_check_eoimode(node, &gic->raw_cpu_base))
1452                 static_branch_disable(&supports_deactivate_key);
1453
1454         ret = __gic_init_bases(gic, &node->fwnode);
1455         if (ret) {
1456                 gic_teardown(gic);
1457                 return ret;
1458         }
1459
1460         if (!gic_cnt) {
1461                 gic_init_physaddr(node);
1462                 gic_of_setup_kvm_info(node);
1463         }
1464
1465         if (parent) {
1466                 irq = irq_of_parse_and_map(node, 0);
1467                 gic_cascade_irq(gic_cnt, irq);
1468         }
1469
1470         if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1471                 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain);
1472
1473         gic_cnt++;
1474         return 0;
1475 }
1476 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init);
1477 IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init);
1478 IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init);
1479 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
1480 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
1481 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
1482 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
1483 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
1484 IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init);
1485 #else
1486 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq)
1487 {
1488         return -ENOTSUPP;
1489 }
1490 #endif
1491
1492 #ifdef CONFIG_ACPI
1493 static struct
1494 {
1495         phys_addr_t cpu_phys_base;
1496         u32 maint_irq;
1497         int maint_irq_mode;
1498         phys_addr_t vctrl_base;
1499         phys_addr_t vcpu_base;
1500 } acpi_data __initdata;
1501
1502 static int __init
1503 gic_acpi_parse_madt_cpu(union acpi_subtable_headers *header,
1504                         const unsigned long end)
1505 {
1506         struct acpi_madt_generic_interrupt *processor;
1507         phys_addr_t gic_cpu_base;
1508         static int cpu_base_assigned;
1509
1510         processor = (struct acpi_madt_generic_interrupt *)header;
1511
1512         if (BAD_MADT_GICC_ENTRY(processor, end))
1513                 return -EINVAL;
1514
1515         /*
1516          * There is no support for non-banked GICv1/2 register in ACPI spec.
1517          * All CPU interface addresses have to be the same.
1518          */
1519         gic_cpu_base = processor->base_address;
1520         if (cpu_base_assigned && gic_cpu_base != acpi_data.cpu_phys_base)
1521                 return -EINVAL;
1522
1523         acpi_data.cpu_phys_base = gic_cpu_base;
1524         acpi_data.maint_irq = processor->vgic_interrupt;
1525         acpi_data.maint_irq_mode = (processor->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
1526                                     ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
1527         acpi_data.vctrl_base = processor->gich_base_address;
1528         acpi_data.vcpu_base = processor->gicv_base_address;
1529
1530         cpu_base_assigned = 1;
1531         return 0;
1532 }
1533
1534 /* The things you have to do to just *count* something... */
1535 static int __init acpi_dummy_func(union acpi_subtable_headers *header,
1536                                   const unsigned long end)
1537 {
1538         return 0;
1539 }
1540
1541 static bool __init acpi_gic_redist_is_present(void)
1542 {
1543         return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1544                                      acpi_dummy_func, 0) > 0;
1545 }
1546
1547 static bool __init gic_validate_dist(struct acpi_subtable_header *header,
1548                                      struct acpi_probe_entry *ape)
1549 {
1550         struct acpi_madt_generic_distributor *dist;
1551         dist = (struct acpi_madt_generic_distributor *)header;
1552
1553         return (dist->version == ape->driver_data &&
1554                 (dist->version != ACPI_MADT_GIC_VERSION_NONE ||
1555                  !acpi_gic_redist_is_present()));
1556 }
1557
1558 #define ACPI_GICV2_DIST_MEM_SIZE        (SZ_4K)
1559 #define ACPI_GIC_CPU_IF_MEM_SIZE        (SZ_8K)
1560 #define ACPI_GICV2_VCTRL_MEM_SIZE       (SZ_4K)
1561 #define ACPI_GICV2_VCPU_MEM_SIZE        (SZ_8K)
1562
1563 static void __init gic_acpi_setup_kvm_info(void)
1564 {
1565         int irq;
1566         struct resource *vctrl_res = &gic_v2_kvm_info.vctrl;
1567         struct resource *vcpu_res = &gic_v2_kvm_info.vcpu;
1568
1569         gic_v2_kvm_info.type = GIC_V2;
1570
1571         if (!acpi_data.vctrl_base)
1572                 return;
1573
1574         vctrl_res->flags = IORESOURCE_MEM;
1575         vctrl_res->start = acpi_data.vctrl_base;
1576         vctrl_res->end = vctrl_res->start + ACPI_GICV2_VCTRL_MEM_SIZE - 1;
1577
1578         if (!acpi_data.vcpu_base)
1579                 return;
1580
1581         vcpu_res->flags = IORESOURCE_MEM;
1582         vcpu_res->start = acpi_data.vcpu_base;
1583         vcpu_res->end = vcpu_res->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
1584
1585         irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
1586                                 acpi_data.maint_irq_mode,
1587                                 ACPI_ACTIVE_HIGH);
1588         if (irq <= 0)
1589                 return;
1590
1591         gic_v2_kvm_info.maint_irq = irq;
1592
1593         gic_set_kvm_info(&gic_v2_kvm_info);
1594 }
1595
1596 static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
1597                                    const unsigned long end)
1598 {
1599         struct acpi_madt_generic_distributor *dist;
1600         struct fwnode_handle *domain_handle;
1601         struct gic_chip_data *gic = &gic_data[0];
1602         int count, ret;
1603
1604         /* Collect CPU base addresses */
1605         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1606                                       gic_acpi_parse_madt_cpu, 0);
1607         if (count <= 0) {
1608                 pr_err("No valid GICC entries exist\n");
1609                 return -EINVAL;
1610         }
1611
1612         gic->raw_cpu_base = ioremap(acpi_data.cpu_phys_base, ACPI_GIC_CPU_IF_MEM_SIZE);
1613         if (!gic->raw_cpu_base) {
1614                 pr_err("Unable to map GICC registers\n");
1615                 return -ENOMEM;
1616         }
1617
1618         dist = (struct acpi_madt_generic_distributor *)header;
1619         gic->raw_dist_base = ioremap(dist->base_address,
1620                                      ACPI_GICV2_DIST_MEM_SIZE);
1621         if (!gic->raw_dist_base) {
1622                 pr_err("Unable to map GICD registers\n");
1623                 gic_teardown(gic);
1624                 return -ENOMEM;
1625         }
1626
1627         /*
1628          * Disable split EOI/Deactivate if HYP is not available. ACPI
1629          * guarantees that we'll always have a GICv2, so the CPU
1630          * interface will always be the right size.
1631          */
1632         if (!is_hyp_mode_available())
1633                 static_branch_disable(&supports_deactivate_key);
1634
1635         /*
1636          * Initialize GIC instance zero (no multi-GIC support).
1637          */
1638         domain_handle = irq_domain_alloc_fwnode(&dist->base_address);
1639         if (!domain_handle) {
1640                 pr_err("Unable to allocate domain handle\n");
1641                 gic_teardown(gic);
1642                 return -ENOMEM;
1643         }
1644
1645         ret = __gic_init_bases(gic, domain_handle);
1646         if (ret) {
1647                 pr_err("Failed to initialise GIC\n");
1648                 irq_domain_free_fwnode(domain_handle);
1649                 gic_teardown(gic);
1650                 return ret;
1651         }
1652
1653         acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1654
1655         if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1656                 gicv2m_init(NULL, gic_data[0].domain);
1657
1658         if (static_branch_likely(&supports_deactivate_key))
1659                 gic_acpi_setup_kvm_info();
1660
1661         return 0;
1662 }
1663 IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1664                      gic_validate_dist, ACPI_MADT_GIC_VERSION_V2,
1665                      gic_v2_acpi_init);
1666 IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1667                      gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE,
1668                      gic_v2_acpi_init);
1669 #endif