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, int irq_start, 1093 struct fwnode_handle *handle) 1094 { 1095 irq_hw_number_t hwirq_base; 1096 int gic_irqs, irq_base, ret; 1097 1098 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) { 1099 /* Frankein-GIC without banked registers... */ 1100 unsigned int cpu; 1101 1102 gic->dist_base.percpu_base = alloc_percpu(void __iomem *); 1103 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *); 1104 if (WARN_ON(!gic->dist_base.percpu_base || 1105 !gic->cpu_base.percpu_base)) { 1106 ret = -ENOMEM; 1107 goto error; 1108 } 1109 1110 for_each_possible_cpu(cpu) { 1111 u32 mpidr = cpu_logical_map(cpu); 1112 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); 1113 unsigned long offset = gic->percpu_offset * core_id; 1114 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = 1115 gic->raw_dist_base + offset; 1116 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = 1117 gic->raw_cpu_base + offset; 1118 } 1119 1120 gic_set_base_accessor(gic, gic_get_percpu_base); 1121 } else { 1122 /* Normal, sane GIC... */ 1123 WARN(gic->percpu_offset, 1124 "GIC_NON_BANKED not enabled, ignoring %08x offset!", 1125 gic->percpu_offset); 1126 gic->dist_base.common_base = gic->raw_dist_base; 1127 gic->cpu_base.common_base = gic->raw_cpu_base; 1128 gic_set_base_accessor(gic, gic_get_common_base); 1129 } 1130 1131 /* 1132 * Find out how many interrupts are supported. 1133 * The GIC only supports up to 1020 interrupt sources. 1134 */ 1135 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f; 1136 gic_irqs = (gic_irqs + 1) * 32; 1137 if (gic_irqs > 1020) 1138 gic_irqs = 1020; 1139 gic->gic_irqs = gic_irqs; 1140 1141 if (handle) { /* DT/ACPI */ 1142 gic->domain = irq_domain_create_linear(handle, gic_irqs, 1143 &gic_irq_domain_hierarchy_ops, 1144 gic); 1145 } else { /* Legacy support */ 1146 /* 1147 * For primary GICs, skip over SGIs. 1148 * For secondary GICs, skip over PPIs, too. 1149 */ 1150 if (gic == &gic_data[0] && (irq_start & 31) > 0) { 1151 hwirq_base = 16; 1152 if (irq_start != -1) 1153 irq_start = (irq_start & ~31) + 16; 1154 } else { 1155 hwirq_base = 32; 1156 } 1157 1158 gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */ 1159 1160 irq_base = irq_alloc_descs(irq_start, 16, gic_irqs, 1161 numa_node_id()); 1162 if (irq_base < 0) { 1163 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", 1164 irq_start); 1165 irq_base = irq_start; 1166 } 1167 1168 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base, 1169 hwirq_base, &gic_irq_domain_ops, gic); 1170 } 1171 1172 if (WARN_ON(!gic->domain)) { 1173 ret = -ENODEV; 1174 goto error; 1175 } 1176 1177 gic_dist_init(gic); 1178 ret = gic_cpu_init(gic); 1179 if (ret) 1180 goto error; 1181 1182 ret = gic_pm_init(gic); 1183 if (ret) 1184 goto error; 1185 1186 return 0; 1187 1188 error: 1189 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) { 1190 free_percpu(gic->dist_base.percpu_base); 1191 free_percpu(gic->cpu_base.percpu_base); 1192 } 1193 1194 return ret; 1195 } 1196 1197 static int __init __gic_init_bases(struct gic_chip_data *gic, 1198 int irq_start, 1199 struct fwnode_handle *handle) 1200 { 1201 char *name; 1202 int i, ret; 1203 1204 if (WARN_ON(!gic || gic->domain)) 1205 return -EINVAL; 1206 1207 if (gic == &gic_data[0]) { 1208 /* 1209 * Initialize the CPU interface map to all CPUs. 1210 * It will be refined as each CPU probes its ID. 1211 * This is only necessary for the primary GIC. 1212 */ 1213 for (i = 0; i < NR_GIC_CPU_IF; i++) 1214 gic_cpu_map[i] = 0xff; 1215 #ifdef CONFIG_SMP 1216 set_smp_cross_call(gic_raise_softirq); 1217 #endif 1218 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING, 1219 "irqchip/arm/gic:starting", 1220 gic_starting_cpu, NULL); 1221 set_handle_irq(gic_handle_irq); 1222 if (static_branch_likely(&supports_deactivate_key)) 1223 pr_info("GIC: Using split EOI/Deactivate mode\n"); 1224 } 1225 1226 if (static_branch_likely(&supports_deactivate_key) && gic == &gic_data[0]) { 1227 name = kasprintf(GFP_KERNEL, "GICv2"); 1228 gic_init_chip(gic, NULL, name, true); 1229 } else { 1230 name = kasprintf(GFP_KERNEL, "GIC-%d", (int)(gic-&gic_data[0])); 1231 gic_init_chip(gic, NULL, name, false); 1232 } 1233 1234 ret = gic_init_bases(gic, irq_start, handle); 1235 if (ret) 1236 kfree(name); 1237 1238 return ret; 1239 } 1240 1241 void __init gic_init(unsigned int gic_nr, int irq_start, 1242 void __iomem *dist_base, void __iomem *cpu_base) 1243 { 1244 struct gic_chip_data *gic; 1245 1246 if (WARN_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR)) 1247 return; 1248 1249 /* 1250 * Non-DT/ACPI systems won't run a hypervisor, so let's not 1251 * bother with these... 1252 */ 1253 static_branch_disable(&supports_deactivate_key); 1254 1255 gic = &gic_data[gic_nr]; 1256 gic->raw_dist_base = dist_base; 1257 gic->raw_cpu_base = cpu_base; 1258 1259 __gic_init_bases(gic, irq_start, NULL); 1260 } 1261 1262 static void gic_teardown(struct gic_chip_data *gic) 1263 { 1264 if (WARN_ON(!gic)) 1265 return; 1266 1267 if (gic->raw_dist_base) 1268 iounmap(gic->raw_dist_base); 1269 if (gic->raw_cpu_base) 1270 iounmap(gic->raw_cpu_base); 1271 } 1272 1273 #ifdef CONFIG_OF 1274 static int gic_cnt __initdata; 1275 static bool gicv2_force_probe; 1276 1277 static int __init gicv2_force_probe_cfg(char *buf) 1278 { 1279 return strtobool(buf, &gicv2_force_probe); 1280 } 1281 early_param("irqchip.gicv2_force_probe", gicv2_force_probe_cfg); 1282 1283 static bool gic_check_eoimode(struct device_node *node, void __iomem **base) 1284 { 1285 struct resource cpuif_res; 1286 1287 of_address_to_resource(node, 1, &cpuif_res); 1288 1289 if (!is_hyp_mode_available()) 1290 return false; 1291 if (resource_size(&cpuif_res) < SZ_8K) { 1292 void __iomem *alt; 1293 /* 1294 * Check for a stupid firmware that only exposes the 1295 * first page of a GICv2. 1296 */ 1297 if (!gic_check_gicv2(*base)) 1298 return false; 1299 1300 if (!gicv2_force_probe) { 1301 pr_warn("GIC: GICv2 detected, but range too small and irqchip.gicv2_force_probe not set\n"); 1302 return false; 1303 } 1304 1305 alt = ioremap(cpuif_res.start, SZ_8K); 1306 if (!alt) 1307 return false; 1308 if (!gic_check_gicv2(alt + SZ_4K)) { 1309 /* 1310 * The first page was that of a GICv2, and 1311 * the second was *something*. Let's trust it 1312 * to be a GICv2, and update the mapping. 1313 */ 1314 pr_warn("GIC: GICv2 at %pa, but range is too small (broken DT?), assuming 8kB\n", 1315 &cpuif_res.start); 1316 iounmap(*base); 1317 *base = alt; 1318 return true; 1319 } 1320 1321 /* 1322 * We detected *two* initial GICv2 pages in a 1323 * row. Could be a GICv2 aliased over two 64kB 1324 * pages. Update the resource, map the iospace, and 1325 * pray. 1326 */ 1327 iounmap(alt); 1328 alt = ioremap(cpuif_res.start, SZ_128K); 1329 if (!alt) 1330 return false; 1331 pr_warn("GIC: Aliased GICv2 at %pa, trying to find the canonical range over 128kB\n", 1332 &cpuif_res.start); 1333 cpuif_res.end = cpuif_res.start + SZ_128K -1; 1334 iounmap(*base); 1335 *base = alt; 1336 } 1337 if (resource_size(&cpuif_res) == SZ_128K) { 1338 /* 1339 * Verify that we have the first 4kB of a GICv2 1340 * aliased over the first 64kB by checking the 1341 * GICC_IIDR register on both ends. 1342 */ 1343 if (!gic_check_gicv2(*base) || 1344 !gic_check_gicv2(*base + 0xf000)) 1345 return false; 1346 1347 /* 1348 * Move the base up by 60kB, so that we have a 8kB 1349 * contiguous region, which allows us to use GICC_DIR 1350 * at its normal offset. Please pass me that bucket. 1351 */ 1352 *base += 0xf000; 1353 cpuif_res.start += 0xf000; 1354 pr_warn("GIC: Adjusting CPU interface base to %pa\n", 1355 &cpuif_res.start); 1356 } 1357 1358 return true; 1359 } 1360 1361 static int gic_of_setup(struct gic_chip_data *gic, struct device_node *node) 1362 { 1363 if (!gic || !node) 1364 return -EINVAL; 1365 1366 gic->raw_dist_base = of_iomap(node, 0); 1367 if (WARN(!gic->raw_dist_base, "unable to map gic dist registers\n")) 1368 goto error; 1369 1370 gic->raw_cpu_base = of_iomap(node, 1); 1371 if (WARN(!gic->raw_cpu_base, "unable to map gic cpu registers\n")) 1372 goto error; 1373 1374 if (of_property_read_u32(node, "cpu-offset", &gic->percpu_offset)) 1375 gic->percpu_offset = 0; 1376 1377 return 0; 1378 1379 error: 1380 gic_teardown(gic); 1381 1382 return -ENOMEM; 1383 } 1384 1385 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq) 1386 { 1387 int ret; 1388 1389 if (!dev || !dev->of_node || !gic || !irq) 1390 return -EINVAL; 1391 1392 *gic = devm_kzalloc(dev, sizeof(**gic), GFP_KERNEL); 1393 if (!*gic) 1394 return -ENOMEM; 1395 1396 gic_init_chip(*gic, dev, dev->of_node->name, false); 1397 1398 ret = gic_of_setup(*gic, dev->of_node); 1399 if (ret) 1400 return ret; 1401 1402 ret = gic_init_bases(*gic, -1, &dev->of_node->fwnode); 1403 if (ret) { 1404 gic_teardown(*gic); 1405 return ret; 1406 } 1407 1408 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq, *gic); 1409 1410 return 0; 1411 } 1412 1413 static void __init gic_of_setup_kvm_info(struct device_node *node) 1414 { 1415 int ret; 1416 struct resource *vctrl_res = &gic_v2_kvm_info.vctrl; 1417 struct resource *vcpu_res = &gic_v2_kvm_info.vcpu; 1418 1419 gic_v2_kvm_info.type = GIC_V2; 1420 1421 gic_v2_kvm_info.maint_irq = irq_of_parse_and_map(node, 0); 1422 if (!gic_v2_kvm_info.maint_irq) 1423 return; 1424 1425 ret = of_address_to_resource(node, 2, vctrl_res); 1426 if (ret) 1427 return; 1428 1429 ret = of_address_to_resource(node, 3, vcpu_res); 1430 if (ret) 1431 return; 1432 1433 if (static_branch_likely(&supports_deactivate_key)) 1434 gic_set_kvm_info(&gic_v2_kvm_info); 1435 } 1436 1437 int __init 1438 gic_of_init(struct device_node *node, struct device_node *parent) 1439 { 1440 struct gic_chip_data *gic; 1441 int irq, ret; 1442 1443 if (WARN_ON(!node)) 1444 return -ENODEV; 1445 1446 if (WARN_ON(gic_cnt >= CONFIG_ARM_GIC_MAX_NR)) 1447 return -EINVAL; 1448 1449 gic = &gic_data[gic_cnt]; 1450 1451 ret = gic_of_setup(gic, node); 1452 if (ret) 1453 return ret; 1454 1455 /* 1456 * Disable split EOI/Deactivate if either HYP is not available 1457 * or the CPU interface is too small. 1458 */ 1459 if (gic_cnt == 0 && !gic_check_eoimode(node, &gic->raw_cpu_base)) 1460 static_branch_disable(&supports_deactivate_key); 1461 1462 ret = __gic_init_bases(gic, -1, &node->fwnode); 1463 if (ret) { 1464 gic_teardown(gic); 1465 return ret; 1466 } 1467 1468 if (!gic_cnt) { 1469 gic_init_physaddr(node); 1470 gic_of_setup_kvm_info(node); 1471 } 1472 1473 if (parent) { 1474 irq = irq_of_parse_and_map(node, 0); 1475 gic_cascade_irq(gic_cnt, irq); 1476 } 1477 1478 if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) 1479 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain); 1480 1481 gic_cnt++; 1482 return 0; 1483 } 1484 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init); 1485 IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init); 1486 IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init); 1487 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init); 1488 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init); 1489 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init); 1490 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init); 1491 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init); 1492 IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init); 1493 #else 1494 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq) 1495 { 1496 return -ENOTSUPP; 1497 } 1498 #endif 1499 1500 #ifdef CONFIG_ACPI 1501 static struct 1502 { 1503 phys_addr_t cpu_phys_base; 1504 u32 maint_irq; 1505 int maint_irq_mode; 1506 phys_addr_t vctrl_base; 1507 phys_addr_t vcpu_base; 1508 } acpi_data __initdata; 1509 1510 static int __init 1511 gic_acpi_parse_madt_cpu(struct acpi_subtable_header *header, 1512 const unsigned long end) 1513 { 1514 struct acpi_madt_generic_interrupt *processor; 1515 phys_addr_t gic_cpu_base; 1516 static int cpu_base_assigned; 1517 1518 processor = (struct acpi_madt_generic_interrupt *)header; 1519 1520 if (BAD_MADT_GICC_ENTRY(processor, end)) 1521 return -EINVAL; 1522 1523 /* 1524 * There is no support for non-banked GICv1/2 register in ACPI spec. 1525 * All CPU interface addresses have to be the same. 1526 */ 1527 gic_cpu_base = processor->base_address; 1528 if (cpu_base_assigned && gic_cpu_base != acpi_data.cpu_phys_base) 1529 return -EINVAL; 1530 1531 acpi_data.cpu_phys_base = gic_cpu_base; 1532 acpi_data.maint_irq = processor->vgic_interrupt; 1533 acpi_data.maint_irq_mode = (processor->flags & ACPI_MADT_VGIC_IRQ_MODE) ? 1534 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE; 1535 acpi_data.vctrl_base = processor->gich_base_address; 1536 acpi_data.vcpu_base = processor->gicv_base_address; 1537 1538 cpu_base_assigned = 1; 1539 return 0; 1540 } 1541 1542 /* The things you have to do to just *count* something... */ 1543 static int __init acpi_dummy_func(struct acpi_subtable_header *header, 1544 const unsigned long end) 1545 { 1546 return 0; 1547 } 1548 1549 static bool __init acpi_gic_redist_is_present(void) 1550 { 1551 return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, 1552 acpi_dummy_func, 0) > 0; 1553 } 1554 1555 static bool __init gic_validate_dist(struct acpi_subtable_header *header, 1556 struct acpi_probe_entry *ape) 1557 { 1558 struct acpi_madt_generic_distributor *dist; 1559 dist = (struct acpi_madt_generic_distributor *)header; 1560 1561 return (dist->version == ape->driver_data && 1562 (dist->version != ACPI_MADT_GIC_VERSION_NONE || 1563 !acpi_gic_redist_is_present())); 1564 } 1565 1566 #define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K) 1567 #define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K) 1568 #define ACPI_GICV2_VCTRL_MEM_SIZE (SZ_4K) 1569 #define ACPI_GICV2_VCPU_MEM_SIZE (SZ_8K) 1570 1571 static void __init gic_acpi_setup_kvm_info(void) 1572 { 1573 int irq; 1574 struct resource *vctrl_res = &gic_v2_kvm_info.vctrl; 1575 struct resource *vcpu_res = &gic_v2_kvm_info.vcpu; 1576 1577 gic_v2_kvm_info.type = GIC_V2; 1578 1579 if (!acpi_data.vctrl_base) 1580 return; 1581 1582 vctrl_res->flags = IORESOURCE_MEM; 1583 vctrl_res->start = acpi_data.vctrl_base; 1584 vctrl_res->end = vctrl_res->start + ACPI_GICV2_VCTRL_MEM_SIZE - 1; 1585 1586 if (!acpi_data.vcpu_base) 1587 return; 1588 1589 vcpu_res->flags = IORESOURCE_MEM; 1590 vcpu_res->start = acpi_data.vcpu_base; 1591 vcpu_res->end = vcpu_res->start + ACPI_GICV2_VCPU_MEM_SIZE - 1; 1592 1593 irq = acpi_register_gsi(NULL, acpi_data.maint_irq, 1594 acpi_data.maint_irq_mode, 1595 ACPI_ACTIVE_HIGH); 1596 if (irq <= 0) 1597 return; 1598 1599 gic_v2_kvm_info.maint_irq = irq; 1600 1601 gic_set_kvm_info(&gic_v2_kvm_info); 1602 } 1603 1604 static int __init gic_v2_acpi_init(struct acpi_subtable_header *header, 1605 const unsigned long end) 1606 { 1607 struct acpi_madt_generic_distributor *dist; 1608 struct fwnode_handle *domain_handle; 1609 struct gic_chip_data *gic = &gic_data[0]; 1610 int count, ret; 1611 1612 /* Collect CPU base addresses */ 1613 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, 1614 gic_acpi_parse_madt_cpu, 0); 1615 if (count <= 0) { 1616 pr_err("No valid GICC entries exist\n"); 1617 return -EINVAL; 1618 } 1619 1620 gic->raw_cpu_base = ioremap(acpi_data.cpu_phys_base, ACPI_GIC_CPU_IF_MEM_SIZE); 1621 if (!gic->raw_cpu_base) { 1622 pr_err("Unable to map GICC registers\n"); 1623 return -ENOMEM; 1624 } 1625 1626 dist = (struct acpi_madt_generic_distributor *)header; 1627 gic->raw_dist_base = ioremap(dist->base_address, 1628 ACPI_GICV2_DIST_MEM_SIZE); 1629 if (!gic->raw_dist_base) { 1630 pr_err("Unable to map GICD registers\n"); 1631 gic_teardown(gic); 1632 return -ENOMEM; 1633 } 1634 1635 /* 1636 * Disable split EOI/Deactivate if HYP is not available. ACPI 1637 * guarantees that we'll always have a GICv2, so the CPU 1638 * interface will always be the right size. 1639 */ 1640 if (!is_hyp_mode_available()) 1641 static_branch_disable(&supports_deactivate_key); 1642 1643 /* 1644 * Initialize GIC instance zero (no multi-GIC support). 1645 */ 1646 domain_handle = irq_domain_alloc_fwnode(gic->raw_dist_base); 1647 if (!domain_handle) { 1648 pr_err("Unable to allocate domain handle\n"); 1649 gic_teardown(gic); 1650 return -ENOMEM; 1651 } 1652 1653 ret = __gic_init_bases(gic, -1, domain_handle); 1654 if (ret) { 1655 pr_err("Failed to initialise GIC\n"); 1656 irq_domain_free_fwnode(domain_handle); 1657 gic_teardown(gic); 1658 return ret; 1659 } 1660 1661 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle); 1662 1663 if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) 1664 gicv2m_init(NULL, gic_data[0].domain); 1665 1666 if (static_branch_likely(&supports_deactivate_key)) 1667 gic_acpi_setup_kvm_info(); 1668 1669 return 0; 1670 } 1671 IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 1672 gic_validate_dist, ACPI_MADT_GIC_VERSION_V2, 1673 gic_v2_acpi_init); 1674 IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 1675 gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE, 1676 gic_v2_acpi_init); 1677 #endif 1678