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/kstrtox.h> 23 #include <linux/err.h> 24 #include <linux/module.h> 25 #include <linux/list.h> 26 #include <linux/smp.h> 27 #include <linux/cpu.h> 28 #include <linux/cpu_pm.h> 29 #include <linux/cpumask.h> 30 #include <linux/io.h> 31 #include <linux/of.h> 32 #include <linux/of_address.h> 33 #include <linux/of_irq.h> 34 #include <linux/acpi.h> 35 #include <linux/irqdomain.h> 36 #include <linux/interrupt.h> 37 #include <linux/percpu.h> 38 #include <linux/seq_file.h> 39 #include <linux/slab.h> 40 #include <linux/irqchip.h> 41 #include <linux/irqchip/chained_irq.h> 42 #include <linux/irqchip/arm-gic.h> 43 44 #include <asm/cputype.h> 45 #include <asm/irq.h> 46 #include <asm/exception.h> 47 #include <asm/smp_plat.h> 48 #include <asm/virt.h> 49 50 #include "irq-gic-common.h" 51 52 #ifdef CONFIG_ARM64 53 #include <asm/cpufeature.h> 54 55 static void gic_check_cpu_features(void) 56 { 57 WARN_TAINT_ONCE(this_cpu_has_cap(ARM64_HAS_GIC_CPUIF_SYSREGS), 58 TAINT_CPU_OUT_OF_SPEC, 59 "GICv3 system registers enabled, broken firmware!\n"); 60 } 61 #else 62 #define gic_check_cpu_features() do { } while(0) 63 #endif 64 65 union gic_base { 66 void __iomem *common_base; 67 void __percpu * __iomem *percpu_base; 68 }; 69 70 struct gic_chip_data { 71 union gic_base dist_base; 72 union gic_base cpu_base; 73 void __iomem *raw_dist_base; 74 void __iomem *raw_cpu_base; 75 u32 percpu_offset; 76 #if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM) 77 u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)]; 78 u32 saved_spi_active[DIV_ROUND_UP(1020, 32)]; 79 u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)]; 80 u32 saved_spi_target[DIV_ROUND_UP(1020, 4)]; 81 u32 __percpu *saved_ppi_enable; 82 u32 __percpu *saved_ppi_active; 83 u32 __percpu *saved_ppi_conf; 84 #endif 85 struct irq_domain *domain; 86 unsigned int gic_irqs; 87 }; 88 89 #ifdef CONFIG_BL_SWITCHER 90 91 static DEFINE_RAW_SPINLOCK(cpu_map_lock); 92 93 #define gic_lock_irqsave(f) \ 94 raw_spin_lock_irqsave(&cpu_map_lock, (f)) 95 #define gic_unlock_irqrestore(f) \ 96 raw_spin_unlock_irqrestore(&cpu_map_lock, (f)) 97 98 #define gic_lock() raw_spin_lock(&cpu_map_lock) 99 #define gic_unlock() raw_spin_unlock(&cpu_map_lock) 100 101 #else 102 103 #define gic_lock_irqsave(f) do { (void)(f); } while(0) 104 #define gic_unlock_irqrestore(f) do { (void)(f); } while(0) 105 106 #define gic_lock() do { } while(0) 107 #define gic_unlock() do { } while(0) 108 109 #endif 110 111 static DEFINE_STATIC_KEY_FALSE(needs_rmw_access); 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 __initdata; 126 127 static DEFINE_PER_CPU(u32, sgi_intid); 128 129 #ifdef CONFIG_GIC_NON_BANKED 130 static DEFINE_STATIC_KEY_FALSE(frankengic_key); 131 132 static void enable_frankengic(void) 133 { 134 static_branch_enable(&frankengic_key); 135 } 136 137 static inline void __iomem *__get_base(union gic_base *base) 138 { 139 if (static_branch_unlikely(&frankengic_key)) 140 return raw_cpu_read(*base->percpu_base); 141 142 return base->common_base; 143 } 144 145 #define gic_data_dist_base(d) __get_base(&(d)->dist_base) 146 #define gic_data_cpu_base(d) __get_base(&(d)->cpu_base) 147 #else 148 #define gic_data_dist_base(d) ((d)->dist_base.common_base) 149 #define gic_data_cpu_base(d) ((d)->cpu_base.common_base) 150 #define enable_frankengic() do { } while(0) 151 #endif 152 153 static inline void __iomem *gic_dist_base(struct irq_data *d) 154 { 155 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d); 156 return gic_data_dist_base(gic_data); 157 } 158 159 static inline void __iomem *gic_cpu_base(struct irq_data *d) 160 { 161 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d); 162 return gic_data_cpu_base(gic_data); 163 } 164 165 static inline unsigned int gic_irq(struct irq_data *d) 166 { 167 return d->hwirq; 168 } 169 170 static inline bool cascading_gic_irq(struct irq_data *d) 171 { 172 void *data = irq_data_get_irq_handler_data(d); 173 174 /* 175 * If handler_data is set, this is a cascading interrupt, and 176 * it cannot possibly be forwarded. 177 */ 178 return data != NULL; 179 } 180 181 /* 182 * Routines to acknowledge, disable and enable interrupts 183 */ 184 static void gic_poke_irq(struct irq_data *d, u32 offset) 185 { 186 u32 mask = 1 << (gic_irq(d) % 32); 187 writel_relaxed(mask, gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4); 188 } 189 190 static int gic_peek_irq(struct irq_data *d, u32 offset) 191 { 192 u32 mask = 1 << (gic_irq(d) % 32); 193 return !!(readl_relaxed(gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4) & mask); 194 } 195 196 static void gic_mask_irq(struct irq_data *d) 197 { 198 gic_poke_irq(d, GIC_DIST_ENABLE_CLEAR); 199 } 200 201 static void gic_eoimode1_mask_irq(struct irq_data *d) 202 { 203 gic_mask_irq(d); 204 /* 205 * When masking a forwarded interrupt, make sure it is 206 * deactivated as well. 207 * 208 * This ensures that an interrupt that is getting 209 * disabled/masked will not get "stuck", because there is 210 * noone to deactivate it (guest is being terminated). 211 */ 212 if (irqd_is_forwarded_to_vcpu(d)) 213 gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR); 214 } 215 216 static void gic_unmask_irq(struct irq_data *d) 217 { 218 gic_poke_irq(d, GIC_DIST_ENABLE_SET); 219 } 220 221 static void gic_eoi_irq(struct irq_data *d) 222 { 223 u32 hwirq = gic_irq(d); 224 225 if (hwirq < 16) 226 hwirq = this_cpu_read(sgi_intid); 227 228 writel_relaxed(hwirq, gic_cpu_base(d) + GIC_CPU_EOI); 229 } 230 231 static void gic_eoimode1_eoi_irq(struct irq_data *d) 232 { 233 u32 hwirq = gic_irq(d); 234 235 /* Do not deactivate an IRQ forwarded to a vcpu. */ 236 if (irqd_is_forwarded_to_vcpu(d)) 237 return; 238 239 if (hwirq < 16) 240 hwirq = this_cpu_read(sgi_intid); 241 242 writel_relaxed(hwirq, gic_cpu_base(d) + GIC_CPU_DEACTIVATE); 243 } 244 245 static int gic_irq_set_irqchip_state(struct irq_data *d, 246 enum irqchip_irq_state which, bool val) 247 { 248 u32 reg; 249 250 switch (which) { 251 case IRQCHIP_STATE_PENDING: 252 reg = val ? GIC_DIST_PENDING_SET : GIC_DIST_PENDING_CLEAR; 253 break; 254 255 case IRQCHIP_STATE_ACTIVE: 256 reg = val ? GIC_DIST_ACTIVE_SET : GIC_DIST_ACTIVE_CLEAR; 257 break; 258 259 case IRQCHIP_STATE_MASKED: 260 reg = val ? GIC_DIST_ENABLE_CLEAR : GIC_DIST_ENABLE_SET; 261 break; 262 263 default: 264 return -EINVAL; 265 } 266 267 gic_poke_irq(d, reg); 268 return 0; 269 } 270 271 static int gic_irq_get_irqchip_state(struct irq_data *d, 272 enum irqchip_irq_state which, bool *val) 273 { 274 switch (which) { 275 case IRQCHIP_STATE_PENDING: 276 *val = gic_peek_irq(d, GIC_DIST_PENDING_SET); 277 break; 278 279 case IRQCHIP_STATE_ACTIVE: 280 *val = gic_peek_irq(d, GIC_DIST_ACTIVE_SET); 281 break; 282 283 case IRQCHIP_STATE_MASKED: 284 *val = !gic_peek_irq(d, GIC_DIST_ENABLE_SET); 285 break; 286 287 default: 288 return -EINVAL; 289 } 290 291 return 0; 292 } 293 294 static int gic_set_type(struct irq_data *d, unsigned int type) 295 { 296 void __iomem *base = gic_dist_base(d); 297 unsigned int gicirq = gic_irq(d); 298 int ret; 299 300 /* Interrupt configuration for SGIs can't be changed */ 301 if (gicirq < 16) 302 return type != IRQ_TYPE_EDGE_RISING ? -EINVAL : 0; 303 304 /* SPIs have restrictions on the supported types */ 305 if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH && 306 type != IRQ_TYPE_EDGE_RISING) 307 return -EINVAL; 308 309 ret = gic_configure_irq(gicirq, type, base + GIC_DIST_CONFIG, NULL); 310 if (ret && gicirq < 32) { 311 /* Misconfigured PPIs are usually not fatal */ 312 pr_warn("GIC: PPI%d is secure or misconfigured\n", gicirq - 16); 313 ret = 0; 314 } 315 316 return ret; 317 } 318 319 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu) 320 { 321 /* Only interrupts on the primary GIC can be forwarded to a vcpu. */ 322 if (cascading_gic_irq(d) || gic_irq(d) < 16) 323 return -EINVAL; 324 325 if (vcpu) 326 irqd_set_forwarded_to_vcpu(d); 327 else 328 irqd_clr_forwarded_to_vcpu(d); 329 return 0; 330 } 331 332 static int gic_retrigger(struct irq_data *data) 333 { 334 return !gic_irq_set_irqchip_state(data, IRQCHIP_STATE_PENDING, true); 335 } 336 337 static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) 338 { 339 u32 irqstat, irqnr; 340 struct gic_chip_data *gic = &gic_data[0]; 341 void __iomem *cpu_base = gic_data_cpu_base(gic); 342 343 do { 344 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK); 345 irqnr = irqstat & GICC_IAR_INT_ID_MASK; 346 347 if (unlikely(irqnr >= 1020)) 348 break; 349 350 if (static_branch_likely(&supports_deactivate_key)) 351 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI); 352 isb(); 353 354 /* 355 * Ensure any shared data written by the CPU sending the IPI 356 * is read after we've read the ACK register on the GIC. 357 * 358 * Pairs with the write barrier in gic_ipi_send_mask 359 */ 360 if (irqnr <= 15) { 361 smp_rmb(); 362 363 /* 364 * The GIC encodes the source CPU in GICC_IAR, 365 * leading to the deactivation to fail if not 366 * written back as is to GICC_EOI. Stash the INTID 367 * away for gic_eoi_irq() to write back. This only 368 * works because we don't nest SGIs... 369 */ 370 this_cpu_write(sgi_intid, irqstat); 371 } 372 373 generic_handle_domain_irq(gic->domain, irqnr); 374 } while (1); 375 } 376 377 static void gic_handle_cascade_irq(struct irq_desc *desc) 378 { 379 struct gic_chip_data *chip_data = irq_desc_get_handler_data(desc); 380 struct irq_chip *chip = irq_desc_get_chip(desc); 381 unsigned int gic_irq; 382 unsigned long status; 383 int ret; 384 385 chained_irq_enter(chip, desc); 386 387 status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK); 388 389 gic_irq = (status & GICC_IAR_INT_ID_MASK); 390 if (gic_irq == GICC_INT_SPURIOUS) 391 goto out; 392 393 isb(); 394 ret = generic_handle_domain_irq(chip_data->domain, gic_irq); 395 if (unlikely(ret)) 396 handle_bad_irq(desc); 397 out: 398 chained_irq_exit(chip, desc); 399 } 400 401 static void gic_irq_print_chip(struct irq_data *d, struct seq_file *p) 402 { 403 struct gic_chip_data *gic = irq_data_get_irq_chip_data(d); 404 405 if (gic->domain->pm_dev) 406 seq_printf(p, gic->domain->pm_dev->of_node->name); 407 else 408 seq_printf(p, "GIC-%d", (int)(gic - &gic_data[0])); 409 } 410 411 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq) 412 { 413 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR); 414 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq, 415 &gic_data[gic_nr]); 416 } 417 418 static u8 gic_get_cpumask(struct gic_chip_data *gic) 419 { 420 void __iomem *base = gic_data_dist_base(gic); 421 u32 mask, i; 422 423 for (i = mask = 0; i < 32; i += 4) { 424 mask = readl_relaxed(base + GIC_DIST_TARGET + i); 425 mask |= mask >> 16; 426 mask |= mask >> 8; 427 if (mask) 428 break; 429 } 430 431 if (!mask && num_possible_cpus() > 1) 432 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n"); 433 434 return mask; 435 } 436 437 static bool gic_check_gicv2(void __iomem *base) 438 { 439 u32 val = readl_relaxed(base + GIC_CPU_IDENT); 440 return (val & 0xff0fff) == 0x02043B; 441 } 442 443 static void gic_cpu_if_up(struct gic_chip_data *gic) 444 { 445 void __iomem *cpu_base = gic_data_cpu_base(gic); 446 u32 bypass = 0; 447 u32 mode = 0; 448 int i; 449 450 if (gic == &gic_data[0] && static_branch_likely(&supports_deactivate_key)) 451 mode = GIC_CPU_CTRL_EOImodeNS; 452 453 if (gic_check_gicv2(cpu_base)) 454 for (i = 0; i < 4; i++) 455 writel_relaxed(0, cpu_base + GIC_CPU_ACTIVEPRIO + i * 4); 456 457 /* 458 * Preserve bypass disable bits to be written back later 459 */ 460 bypass = readl(cpu_base + GIC_CPU_CTRL); 461 bypass &= GICC_DIS_BYPASS_MASK; 462 463 writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL); 464 } 465 466 467 static void gic_dist_init(struct gic_chip_data *gic) 468 { 469 unsigned int i; 470 u32 cpumask; 471 unsigned int gic_irqs = gic->gic_irqs; 472 void __iomem *base = gic_data_dist_base(gic); 473 474 writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL); 475 476 /* 477 * Set all global interrupts to this CPU only. 478 */ 479 cpumask = gic_get_cpumask(gic); 480 cpumask |= cpumask << 8; 481 cpumask |= cpumask << 16; 482 for (i = 32; i < gic_irqs; i += 4) 483 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4); 484 485 gic_dist_config(base, gic_irqs, NULL); 486 487 writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL); 488 } 489 490 static int gic_cpu_init(struct gic_chip_data *gic) 491 { 492 void __iomem *dist_base = gic_data_dist_base(gic); 493 void __iomem *base = gic_data_cpu_base(gic); 494 unsigned int cpu_mask, cpu = smp_processor_id(); 495 int i; 496 497 /* 498 * Setting up the CPU map is only relevant for the primary GIC 499 * because any nested/secondary GICs do not directly interface 500 * with the CPU(s). 501 */ 502 if (gic == &gic_data[0]) { 503 /* 504 * Get what the GIC says our CPU mask is. 505 */ 506 if (WARN_ON(cpu >= NR_GIC_CPU_IF)) 507 return -EINVAL; 508 509 gic_check_cpu_features(); 510 cpu_mask = gic_get_cpumask(gic); 511 gic_cpu_map[cpu] = cpu_mask; 512 513 /* 514 * Clear our mask from the other map entries in case they're 515 * still undefined. 516 */ 517 for (i = 0; i < NR_GIC_CPU_IF; i++) 518 if (i != cpu) 519 gic_cpu_map[i] &= ~cpu_mask; 520 } 521 522 gic_cpu_config(dist_base, 32, NULL); 523 524 writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK); 525 gic_cpu_if_up(gic); 526 527 return 0; 528 } 529 530 int gic_cpu_if_down(unsigned int gic_nr) 531 { 532 void __iomem *cpu_base; 533 u32 val = 0; 534 535 if (gic_nr >= CONFIG_ARM_GIC_MAX_NR) 536 return -EINVAL; 537 538 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]); 539 val = readl(cpu_base + GIC_CPU_CTRL); 540 val &= ~GICC_ENABLE; 541 writel_relaxed(val, cpu_base + GIC_CPU_CTRL); 542 543 return 0; 544 } 545 546 #if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM) 547 /* 548 * Saves the GIC distributor registers during suspend or idle. Must be called 549 * with interrupts disabled but before powering down the GIC. After calling 550 * this function, no interrupts will be delivered by the GIC, and another 551 * platform-specific wakeup source must be enabled. 552 */ 553 void gic_dist_save(struct gic_chip_data *gic) 554 { 555 unsigned int gic_irqs; 556 void __iomem *dist_base; 557 int i; 558 559 if (WARN_ON(!gic)) 560 return; 561 562 gic_irqs = gic->gic_irqs; 563 dist_base = gic_data_dist_base(gic); 564 565 if (!dist_base) 566 return; 567 568 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++) 569 gic->saved_spi_conf[i] = 570 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4); 571 572 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) 573 gic->saved_spi_target[i] = 574 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4); 575 576 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) 577 gic->saved_spi_enable[i] = 578 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); 579 580 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) 581 gic->saved_spi_active[i] = 582 readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4); 583 } 584 585 /* 586 * Restores the GIC distributor registers during resume or when coming out of 587 * idle. Must be called before enabling interrupts. If a level interrupt 588 * that occurred while the GIC was suspended is still present, it will be 589 * handled normally, but any edge interrupts that occurred will not be seen by 590 * the GIC and need to be handled by the platform-specific wakeup source. 591 */ 592 void gic_dist_restore(struct gic_chip_data *gic) 593 { 594 unsigned int gic_irqs; 595 unsigned int i; 596 void __iomem *dist_base; 597 598 if (WARN_ON(!gic)) 599 return; 600 601 gic_irqs = gic->gic_irqs; 602 dist_base = gic_data_dist_base(gic); 603 604 if (!dist_base) 605 return; 606 607 writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL); 608 609 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++) 610 writel_relaxed(gic->saved_spi_conf[i], 611 dist_base + GIC_DIST_CONFIG + i * 4); 612 613 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) 614 writel_relaxed(GICD_INT_DEF_PRI_X4, 615 dist_base + GIC_DIST_PRI + i * 4); 616 617 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) 618 writel_relaxed(gic->saved_spi_target[i], 619 dist_base + GIC_DIST_TARGET + i * 4); 620 621 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) { 622 writel_relaxed(GICD_INT_EN_CLR_X32, 623 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4); 624 writel_relaxed(gic->saved_spi_enable[i], 625 dist_base + GIC_DIST_ENABLE_SET + i * 4); 626 } 627 628 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) { 629 writel_relaxed(GICD_INT_EN_CLR_X32, 630 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4); 631 writel_relaxed(gic->saved_spi_active[i], 632 dist_base + GIC_DIST_ACTIVE_SET + i * 4); 633 } 634 635 writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL); 636 } 637 638 void gic_cpu_save(struct gic_chip_data *gic) 639 { 640 int i; 641 u32 *ptr; 642 void __iomem *dist_base; 643 void __iomem *cpu_base; 644 645 if (WARN_ON(!gic)) 646 return; 647 648 dist_base = gic_data_dist_base(gic); 649 cpu_base = gic_data_cpu_base(gic); 650 651 if (!dist_base || !cpu_base) 652 return; 653 654 ptr = raw_cpu_ptr(gic->saved_ppi_enable); 655 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) 656 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); 657 658 ptr = raw_cpu_ptr(gic->saved_ppi_active); 659 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) 660 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4); 661 662 ptr = raw_cpu_ptr(gic->saved_ppi_conf); 663 for (i = 0; i < DIV_ROUND_UP(32, 16); i++) 664 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4); 665 666 } 667 668 void gic_cpu_restore(struct gic_chip_data *gic) 669 { 670 int i; 671 u32 *ptr; 672 void __iomem *dist_base; 673 void __iomem *cpu_base; 674 675 if (WARN_ON(!gic)) 676 return; 677 678 dist_base = gic_data_dist_base(gic); 679 cpu_base = gic_data_cpu_base(gic); 680 681 if (!dist_base || !cpu_base) 682 return; 683 684 ptr = raw_cpu_ptr(gic->saved_ppi_enable); 685 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) { 686 writel_relaxed(GICD_INT_EN_CLR_X32, 687 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4); 688 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4); 689 } 690 691 ptr = raw_cpu_ptr(gic->saved_ppi_active); 692 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) { 693 writel_relaxed(GICD_INT_EN_CLR_X32, 694 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4); 695 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4); 696 } 697 698 ptr = raw_cpu_ptr(gic->saved_ppi_conf); 699 for (i = 0; i < DIV_ROUND_UP(32, 16); i++) 700 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4); 701 702 for (i = 0; i < DIV_ROUND_UP(32, 4); i++) 703 writel_relaxed(GICD_INT_DEF_PRI_X4, 704 dist_base + GIC_DIST_PRI + i * 4); 705 706 writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK); 707 gic_cpu_if_up(gic); 708 } 709 710 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v) 711 { 712 int i; 713 714 for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) { 715 switch (cmd) { 716 case CPU_PM_ENTER: 717 gic_cpu_save(&gic_data[i]); 718 break; 719 case CPU_PM_ENTER_FAILED: 720 case CPU_PM_EXIT: 721 gic_cpu_restore(&gic_data[i]); 722 break; 723 case CPU_CLUSTER_PM_ENTER: 724 gic_dist_save(&gic_data[i]); 725 break; 726 case CPU_CLUSTER_PM_ENTER_FAILED: 727 case CPU_CLUSTER_PM_EXIT: 728 gic_dist_restore(&gic_data[i]); 729 break; 730 } 731 } 732 733 return NOTIFY_OK; 734 } 735 736 static struct notifier_block gic_notifier_block = { 737 .notifier_call = gic_notifier, 738 }; 739 740 static int gic_pm_init(struct gic_chip_data *gic) 741 { 742 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4, 743 sizeof(u32)); 744 if (WARN_ON(!gic->saved_ppi_enable)) 745 return -ENOMEM; 746 747 gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4, 748 sizeof(u32)); 749 if (WARN_ON(!gic->saved_ppi_active)) 750 goto free_ppi_enable; 751 752 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4, 753 sizeof(u32)); 754 if (WARN_ON(!gic->saved_ppi_conf)) 755 goto free_ppi_active; 756 757 if (gic == &gic_data[0]) 758 cpu_pm_register_notifier(&gic_notifier_block); 759 760 return 0; 761 762 free_ppi_active: 763 free_percpu(gic->saved_ppi_active); 764 free_ppi_enable: 765 free_percpu(gic->saved_ppi_enable); 766 767 return -ENOMEM; 768 } 769 #else 770 static int gic_pm_init(struct gic_chip_data *gic) 771 { 772 return 0; 773 } 774 #endif 775 776 #ifdef CONFIG_SMP 777 static void rmw_writeb(u8 bval, void __iomem *addr) 778 { 779 static DEFINE_RAW_SPINLOCK(rmw_lock); 780 unsigned long offset = (unsigned long)addr & 3UL; 781 unsigned long shift = offset * 8; 782 unsigned long flags; 783 u32 val; 784 785 raw_spin_lock_irqsave(&rmw_lock, flags); 786 787 addr -= offset; 788 val = readl_relaxed(addr); 789 val &= ~GENMASK(shift + 7, shift); 790 val |= bval << shift; 791 writel_relaxed(val, addr); 792 793 raw_spin_unlock_irqrestore(&rmw_lock, flags); 794 } 795 796 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, 797 bool force) 798 { 799 void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + gic_irq(d); 800 struct gic_chip_data *gic = irq_data_get_irq_chip_data(d); 801 unsigned int cpu; 802 803 if (unlikely(gic != &gic_data[0])) 804 return -EINVAL; 805 806 if (!force) 807 cpu = cpumask_any_and(mask_val, cpu_online_mask); 808 else 809 cpu = cpumask_first(mask_val); 810 811 if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids) 812 return -EINVAL; 813 814 if (static_branch_unlikely(&needs_rmw_access)) 815 rmw_writeb(gic_cpu_map[cpu], reg); 816 else 817 writeb_relaxed(gic_cpu_map[cpu], reg); 818 irq_data_update_effective_affinity(d, cpumask_of(cpu)); 819 820 return IRQ_SET_MASK_OK_DONE; 821 } 822 823 static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask) 824 { 825 int cpu; 826 unsigned long flags, map = 0; 827 828 if (unlikely(nr_cpu_ids == 1)) { 829 /* Only one CPU? let's do a self-IPI... */ 830 writel_relaxed(2 << 24 | d->hwirq, 831 gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); 832 return; 833 } 834 835 gic_lock_irqsave(flags); 836 837 /* Convert our logical CPU mask into a physical one. */ 838 for_each_cpu(cpu, mask) 839 map |= gic_cpu_map[cpu]; 840 841 /* 842 * Ensure that stores to Normal memory are visible to the 843 * other CPUs before they observe us issuing the IPI. 844 */ 845 dmb(ishst); 846 847 /* this always happens on GIC0 */ 848 writel_relaxed(map << 16 | d->hwirq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); 849 850 gic_unlock_irqrestore(flags); 851 } 852 853 static int gic_starting_cpu(unsigned int cpu) 854 { 855 gic_cpu_init(&gic_data[0]); 856 return 0; 857 } 858 859 static __init void gic_smp_init(void) 860 { 861 struct irq_fwspec sgi_fwspec = { 862 .fwnode = gic_data[0].domain->fwnode, 863 .param_count = 1, 864 }; 865 int base_sgi; 866 867 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING, 868 "irqchip/arm/gic:starting", 869 gic_starting_cpu, NULL); 870 871 base_sgi = irq_domain_alloc_irqs(gic_data[0].domain, 8, NUMA_NO_NODE, &sgi_fwspec); 872 if (WARN_ON(base_sgi <= 0)) 873 return; 874 875 set_smp_ipi_range(base_sgi, 8); 876 } 877 #else 878 #define gic_smp_init() do { } while(0) 879 #define gic_set_affinity NULL 880 #define gic_ipi_send_mask NULL 881 #endif 882 883 static const struct irq_chip gic_chip = { 884 .irq_mask = gic_mask_irq, 885 .irq_unmask = gic_unmask_irq, 886 .irq_eoi = gic_eoi_irq, 887 .irq_set_type = gic_set_type, 888 .irq_retrigger = gic_retrigger, 889 .irq_set_affinity = gic_set_affinity, 890 .ipi_send_mask = gic_ipi_send_mask, 891 .irq_get_irqchip_state = gic_irq_get_irqchip_state, 892 .irq_set_irqchip_state = gic_irq_set_irqchip_state, 893 .irq_print_chip = gic_irq_print_chip, 894 .flags = IRQCHIP_SET_TYPE_MASKED | 895 IRQCHIP_SKIP_SET_WAKE | 896 IRQCHIP_MASK_ON_SUSPEND, 897 }; 898 899 static const struct irq_chip gic_chip_mode1 = { 900 .name = "GICv2", 901 .irq_mask = gic_eoimode1_mask_irq, 902 .irq_unmask = gic_unmask_irq, 903 .irq_eoi = gic_eoimode1_eoi_irq, 904 .irq_set_type = gic_set_type, 905 .irq_retrigger = gic_retrigger, 906 .irq_set_affinity = gic_set_affinity, 907 .ipi_send_mask = gic_ipi_send_mask, 908 .irq_get_irqchip_state = gic_irq_get_irqchip_state, 909 .irq_set_irqchip_state = gic_irq_set_irqchip_state, 910 .irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity, 911 .flags = IRQCHIP_SET_TYPE_MASKED | 912 IRQCHIP_SKIP_SET_WAKE | 913 IRQCHIP_MASK_ON_SUSPEND, 914 }; 915 916 #ifdef CONFIG_BL_SWITCHER 917 /* 918 * gic_send_sgi - send a SGI directly to given CPU interface number 919 * 920 * cpu_id: the ID for the destination CPU interface 921 * irq: the IPI number to send a SGI for 922 */ 923 void gic_send_sgi(unsigned int cpu_id, unsigned int irq) 924 { 925 BUG_ON(cpu_id >= NR_GIC_CPU_IF); 926 cpu_id = 1 << cpu_id; 927 /* this always happens on GIC0 */ 928 writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); 929 } 930 931 /* 932 * gic_get_cpu_id - get the CPU interface ID for the specified CPU 933 * 934 * @cpu: the logical CPU number to get the GIC ID for. 935 * 936 * Return the CPU interface ID for the given logical CPU number, 937 * or -1 if the CPU number is too large or the interface ID is 938 * unknown (more than one bit set). 939 */ 940 int gic_get_cpu_id(unsigned int cpu) 941 { 942 unsigned int cpu_bit; 943 944 if (cpu >= NR_GIC_CPU_IF) 945 return -1; 946 cpu_bit = gic_cpu_map[cpu]; 947 if (cpu_bit & (cpu_bit - 1)) 948 return -1; 949 return __ffs(cpu_bit); 950 } 951 952 /* 953 * gic_migrate_target - migrate IRQs to another CPU interface 954 * 955 * @new_cpu_id: the CPU target ID to migrate IRQs to 956 * 957 * Migrate all peripheral interrupts with a target matching the current CPU 958 * to the interface corresponding to @new_cpu_id. The CPU interface mapping 959 * is also updated. Targets to other CPU interfaces are unchanged. 960 * This must be called with IRQs locally disabled. 961 */ 962 void gic_migrate_target(unsigned int new_cpu_id) 963 { 964 unsigned int cur_cpu_id, gic_irqs, gic_nr = 0; 965 void __iomem *dist_base; 966 int i, ror_val, cpu = smp_processor_id(); 967 u32 val, cur_target_mask, active_mask; 968 969 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR); 970 971 dist_base = gic_data_dist_base(&gic_data[gic_nr]); 972 if (!dist_base) 973 return; 974 gic_irqs = gic_data[gic_nr].gic_irqs; 975 976 cur_cpu_id = __ffs(gic_cpu_map[cpu]); 977 cur_target_mask = 0x01010101 << cur_cpu_id; 978 ror_val = (cur_cpu_id - new_cpu_id) & 31; 979 980 gic_lock(); 981 982 /* Update the target interface for this logical CPU */ 983 gic_cpu_map[cpu] = 1 << new_cpu_id; 984 985 /* 986 * Find all the peripheral interrupts targeting the current 987 * CPU interface and migrate them to the new CPU interface. 988 * We skip DIST_TARGET 0 to 7 as they are read-only. 989 */ 990 for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) { 991 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4); 992 active_mask = val & cur_target_mask; 993 if (active_mask) { 994 val &= ~active_mask; 995 val |= ror32(active_mask, ror_val); 996 writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4); 997 } 998 } 999 1000 gic_unlock(); 1001 1002 /* 1003 * Now let's migrate and clear any potential SGIs that might be 1004 * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET 1005 * is a banked register, we can only forward the SGI using 1006 * GIC_DIST_SOFTINT. The original SGI source is lost but Linux 1007 * doesn't use that information anyway. 1008 * 1009 * For the same reason we do not adjust SGI source information 1010 * for previously sent SGIs by us to other CPUs either. 1011 */ 1012 for (i = 0; i < 16; i += 4) { 1013 int j; 1014 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i); 1015 if (!val) 1016 continue; 1017 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i); 1018 for (j = i; j < i + 4; j++) { 1019 if (val & 0xff) 1020 writel_relaxed((1 << (new_cpu_id + 16)) | j, 1021 dist_base + GIC_DIST_SOFTINT); 1022 val >>= 8; 1023 } 1024 } 1025 } 1026 1027 /* 1028 * gic_get_sgir_physaddr - get the physical address for the SGI register 1029 * 1030 * Return the physical address of the SGI register to be used 1031 * by some early assembly code when the kernel is not yet available. 1032 */ 1033 static unsigned long gic_dist_physaddr; 1034 1035 unsigned long gic_get_sgir_physaddr(void) 1036 { 1037 if (!gic_dist_physaddr) 1038 return 0; 1039 return gic_dist_physaddr + GIC_DIST_SOFTINT; 1040 } 1041 1042 static void __init gic_init_physaddr(struct device_node *node) 1043 { 1044 struct resource res; 1045 if (of_address_to_resource(node, 0, &res) == 0) { 1046 gic_dist_physaddr = res.start; 1047 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr); 1048 } 1049 } 1050 1051 #else 1052 #define gic_init_physaddr(node) do { } while (0) 1053 #endif 1054 1055 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq, 1056 irq_hw_number_t hw) 1057 { 1058 struct gic_chip_data *gic = d->host_data; 1059 struct irq_data *irqd = irq_desc_get_irq_data(irq_to_desc(irq)); 1060 const struct irq_chip *chip; 1061 1062 chip = (static_branch_likely(&supports_deactivate_key) && 1063 gic == &gic_data[0]) ? &gic_chip_mode1 : &gic_chip; 1064 1065 switch (hw) { 1066 case 0 ... 31: 1067 irq_set_percpu_devid(irq); 1068 irq_domain_set_info(d, irq, hw, chip, d->host_data, 1069 handle_percpu_devid_irq, NULL, NULL); 1070 break; 1071 default: 1072 irq_domain_set_info(d, irq, hw, chip, d->host_data, 1073 handle_fasteoi_irq, NULL, NULL); 1074 irq_set_probe(irq); 1075 irqd_set_single_target(irqd); 1076 break; 1077 } 1078 1079 /* Prevents SW retriggers which mess up the ACK/EOI ordering */ 1080 irqd_set_handle_enforce_irqctx(irqd); 1081 return 0; 1082 } 1083 1084 static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq) 1085 { 1086 } 1087 1088 static int gic_irq_domain_translate(struct irq_domain *d, 1089 struct irq_fwspec *fwspec, 1090 unsigned long *hwirq, 1091 unsigned int *type) 1092 { 1093 if (fwspec->param_count == 1 && fwspec->param[0] < 16) { 1094 *hwirq = fwspec->param[0]; 1095 *type = IRQ_TYPE_EDGE_RISING; 1096 return 0; 1097 } 1098 1099 if (is_of_node(fwspec->fwnode)) { 1100 if (fwspec->param_count < 3) 1101 return -EINVAL; 1102 1103 switch (fwspec->param[0]) { 1104 case 0: /* SPI */ 1105 *hwirq = fwspec->param[1] + 32; 1106 break; 1107 case 1: /* PPI */ 1108 *hwirq = fwspec->param[1] + 16; 1109 break; 1110 default: 1111 return -EINVAL; 1112 } 1113 1114 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; 1115 1116 /* Make it clear that broken DTs are... broken */ 1117 WARN(*type == IRQ_TYPE_NONE, 1118 "HW irq %ld has invalid type\n", *hwirq); 1119 return 0; 1120 } 1121 1122 if (is_fwnode_irqchip(fwspec->fwnode)) { 1123 if(fwspec->param_count != 2) 1124 return -EINVAL; 1125 1126 if (fwspec->param[0] < 16) { 1127 pr_err(FW_BUG "Illegal GSI%d translation request\n", 1128 fwspec->param[0]); 1129 return -EINVAL; 1130 } 1131 1132 *hwirq = fwspec->param[0]; 1133 *type = fwspec->param[1]; 1134 1135 WARN(*type == IRQ_TYPE_NONE, 1136 "HW irq %ld has invalid type\n", *hwirq); 1137 return 0; 1138 } 1139 1140 return -EINVAL; 1141 } 1142 1143 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, 1144 unsigned int nr_irqs, void *arg) 1145 { 1146 int i, ret; 1147 irq_hw_number_t hwirq; 1148 unsigned int type = IRQ_TYPE_NONE; 1149 struct irq_fwspec *fwspec = arg; 1150 1151 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type); 1152 if (ret) 1153 return ret; 1154 1155 for (i = 0; i < nr_irqs; i++) { 1156 ret = gic_irq_domain_map(domain, virq + i, hwirq + i); 1157 if (ret) 1158 return ret; 1159 } 1160 1161 return 0; 1162 } 1163 1164 static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = { 1165 .translate = gic_irq_domain_translate, 1166 .alloc = gic_irq_domain_alloc, 1167 .free = irq_domain_free_irqs_top, 1168 }; 1169 1170 static const struct irq_domain_ops gic_irq_domain_ops = { 1171 .map = gic_irq_domain_map, 1172 .unmap = gic_irq_domain_unmap, 1173 }; 1174 1175 static int gic_init_bases(struct gic_chip_data *gic, 1176 struct fwnode_handle *handle) 1177 { 1178 int gic_irqs, ret; 1179 1180 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) { 1181 /* Frankein-GIC without banked registers... */ 1182 unsigned int cpu; 1183 1184 gic->dist_base.percpu_base = alloc_percpu(void __iomem *); 1185 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *); 1186 if (WARN_ON(!gic->dist_base.percpu_base || 1187 !gic->cpu_base.percpu_base)) { 1188 ret = -ENOMEM; 1189 goto error; 1190 } 1191 1192 for_each_possible_cpu(cpu) { 1193 u32 mpidr = cpu_logical_map(cpu); 1194 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); 1195 unsigned long offset = gic->percpu_offset * core_id; 1196 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = 1197 gic->raw_dist_base + offset; 1198 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = 1199 gic->raw_cpu_base + offset; 1200 } 1201 1202 enable_frankengic(); 1203 } else { 1204 /* Normal, sane GIC... */ 1205 WARN(gic->percpu_offset, 1206 "GIC_NON_BANKED not enabled, ignoring %08x offset!", 1207 gic->percpu_offset); 1208 gic->dist_base.common_base = gic->raw_dist_base; 1209 gic->cpu_base.common_base = gic->raw_cpu_base; 1210 } 1211 1212 /* 1213 * Find out how many interrupts are supported. 1214 * The GIC only supports up to 1020 interrupt sources. 1215 */ 1216 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f; 1217 gic_irqs = (gic_irqs + 1) * 32; 1218 if (gic_irqs > 1020) 1219 gic_irqs = 1020; 1220 gic->gic_irqs = gic_irqs; 1221 1222 if (handle) { /* DT/ACPI */ 1223 gic->domain = irq_domain_create_linear(handle, gic_irqs, 1224 &gic_irq_domain_hierarchy_ops, 1225 gic); 1226 } else { /* Legacy support */ 1227 /* 1228 * For primary GICs, skip over SGIs. 1229 * No secondary GIC support whatsoever. 1230 */ 1231 int irq_base; 1232 1233 gic_irqs -= 16; /* calculate # of irqs to allocate */ 1234 1235 irq_base = irq_alloc_descs(16, 16, gic_irqs, 1236 numa_node_id()); 1237 if (irq_base < 0) { 1238 WARN(1, "Cannot allocate irq_descs @ IRQ16, assuming pre-allocated\n"); 1239 irq_base = 16; 1240 } 1241 1242 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base, 1243 16, &gic_irq_domain_ops, gic); 1244 } 1245 1246 if (WARN_ON(!gic->domain)) { 1247 ret = -ENODEV; 1248 goto error; 1249 } 1250 1251 gic_dist_init(gic); 1252 ret = gic_cpu_init(gic); 1253 if (ret) 1254 goto error; 1255 1256 ret = gic_pm_init(gic); 1257 if (ret) 1258 goto error; 1259 1260 return 0; 1261 1262 error: 1263 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) { 1264 free_percpu(gic->dist_base.percpu_base); 1265 free_percpu(gic->cpu_base.percpu_base); 1266 } 1267 1268 return ret; 1269 } 1270 1271 static int __init __gic_init_bases(struct gic_chip_data *gic, 1272 struct fwnode_handle *handle) 1273 { 1274 int i, ret; 1275 1276 if (WARN_ON(!gic || gic->domain)) 1277 return -EINVAL; 1278 1279 if (gic == &gic_data[0]) { 1280 /* 1281 * Initialize the CPU interface map to all CPUs. 1282 * It will be refined as each CPU probes its ID. 1283 * This is only necessary for the primary GIC. 1284 */ 1285 for (i = 0; i < NR_GIC_CPU_IF; i++) 1286 gic_cpu_map[i] = 0xff; 1287 1288 set_handle_irq(gic_handle_irq); 1289 if (static_branch_likely(&supports_deactivate_key)) 1290 pr_info("GIC: Using split EOI/Deactivate mode\n"); 1291 } 1292 1293 ret = gic_init_bases(gic, handle); 1294 if (gic == &gic_data[0]) 1295 gic_smp_init(); 1296 1297 return ret; 1298 } 1299 1300 void __init gic_init(void __iomem *dist_base, void __iomem *cpu_base) 1301 { 1302 struct gic_chip_data *gic; 1303 1304 /* 1305 * Non-DT/ACPI systems won't run a hypervisor, so let's not 1306 * bother with these... 1307 */ 1308 static_branch_disable(&supports_deactivate_key); 1309 1310 gic = &gic_data[0]; 1311 gic->raw_dist_base = dist_base; 1312 gic->raw_cpu_base = cpu_base; 1313 1314 __gic_init_bases(gic, NULL); 1315 } 1316 1317 static void gic_teardown(struct gic_chip_data *gic) 1318 { 1319 if (WARN_ON(!gic)) 1320 return; 1321 1322 if (gic->raw_dist_base) 1323 iounmap(gic->raw_dist_base); 1324 if (gic->raw_cpu_base) 1325 iounmap(gic->raw_cpu_base); 1326 } 1327 1328 #ifdef CONFIG_OF 1329 static int gic_cnt __initdata; 1330 static bool gicv2_force_probe; 1331 1332 static int __init gicv2_force_probe_cfg(char *buf) 1333 { 1334 return kstrtobool(buf, &gicv2_force_probe); 1335 } 1336 early_param("irqchip.gicv2_force_probe", gicv2_force_probe_cfg); 1337 1338 static bool gic_check_eoimode(struct device_node *node, void __iomem **base) 1339 { 1340 struct resource cpuif_res; 1341 1342 of_address_to_resource(node, 1, &cpuif_res); 1343 1344 if (!is_hyp_mode_available()) 1345 return false; 1346 if (resource_size(&cpuif_res) < SZ_8K) { 1347 void __iomem *alt; 1348 /* 1349 * Check for a stupid firmware that only exposes the 1350 * first page of a GICv2. 1351 */ 1352 if (!gic_check_gicv2(*base)) 1353 return false; 1354 1355 if (!gicv2_force_probe) { 1356 pr_warn("GIC: GICv2 detected, but range too small and irqchip.gicv2_force_probe not set\n"); 1357 return false; 1358 } 1359 1360 alt = ioremap(cpuif_res.start, SZ_8K); 1361 if (!alt) 1362 return false; 1363 if (!gic_check_gicv2(alt + SZ_4K)) { 1364 /* 1365 * The first page was that of a GICv2, and 1366 * the second was *something*. Let's trust it 1367 * to be a GICv2, and update the mapping. 1368 */ 1369 pr_warn("GIC: GICv2 at %pa, but range is too small (broken DT?), assuming 8kB\n", 1370 &cpuif_res.start); 1371 iounmap(*base); 1372 *base = alt; 1373 return true; 1374 } 1375 1376 /* 1377 * We detected *two* initial GICv2 pages in a 1378 * row. Could be a GICv2 aliased over two 64kB 1379 * pages. Update the resource, map the iospace, and 1380 * pray. 1381 */ 1382 iounmap(alt); 1383 alt = ioremap(cpuif_res.start, SZ_128K); 1384 if (!alt) 1385 return false; 1386 pr_warn("GIC: Aliased GICv2 at %pa, trying to find the canonical range over 128kB\n", 1387 &cpuif_res.start); 1388 cpuif_res.end = cpuif_res.start + SZ_128K -1; 1389 iounmap(*base); 1390 *base = alt; 1391 } 1392 if (resource_size(&cpuif_res) == SZ_128K) { 1393 /* 1394 * Verify that we have the first 4kB of a GICv2 1395 * aliased over the first 64kB by checking the 1396 * GICC_IIDR register on both ends. 1397 */ 1398 if (!gic_check_gicv2(*base) || 1399 !gic_check_gicv2(*base + 0xf000)) 1400 return false; 1401 1402 /* 1403 * Move the base up by 60kB, so that we have a 8kB 1404 * contiguous region, which allows us to use GICC_DIR 1405 * at its normal offset. Please pass me that bucket. 1406 */ 1407 *base += 0xf000; 1408 cpuif_res.start += 0xf000; 1409 pr_warn("GIC: Adjusting CPU interface base to %pa\n", 1410 &cpuif_res.start); 1411 } 1412 1413 return true; 1414 } 1415 1416 static bool gic_enable_rmw_access(void *data) 1417 { 1418 /* 1419 * The EMEV2 class of machines has a broken interconnect, and 1420 * locks up on accesses that are less than 32bit. So far, only 1421 * the affinity setting requires it. 1422 */ 1423 if (of_machine_is_compatible("renesas,emev2")) { 1424 static_branch_enable(&needs_rmw_access); 1425 return true; 1426 } 1427 1428 return false; 1429 } 1430 1431 static const struct gic_quirk gic_quirks[] = { 1432 { 1433 .desc = "broken byte access", 1434 .compatible = "arm,pl390", 1435 .init = gic_enable_rmw_access, 1436 }, 1437 { }, 1438 }; 1439 1440 static int gic_of_setup(struct gic_chip_data *gic, struct device_node *node) 1441 { 1442 if (!gic || !node) 1443 return -EINVAL; 1444 1445 gic->raw_dist_base = of_iomap(node, 0); 1446 if (WARN(!gic->raw_dist_base, "unable to map gic dist registers\n")) 1447 goto error; 1448 1449 gic->raw_cpu_base = of_iomap(node, 1); 1450 if (WARN(!gic->raw_cpu_base, "unable to map gic cpu registers\n")) 1451 goto error; 1452 1453 if (of_property_read_u32(node, "cpu-offset", &gic->percpu_offset)) 1454 gic->percpu_offset = 0; 1455 1456 gic_enable_of_quirks(node, gic_quirks, gic); 1457 1458 return 0; 1459 1460 error: 1461 gic_teardown(gic); 1462 1463 return -ENOMEM; 1464 } 1465 1466 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq) 1467 { 1468 int ret; 1469 1470 if (!dev || !dev->of_node || !gic || !irq) 1471 return -EINVAL; 1472 1473 *gic = devm_kzalloc(dev, sizeof(**gic), GFP_KERNEL); 1474 if (!*gic) 1475 return -ENOMEM; 1476 1477 ret = gic_of_setup(*gic, dev->of_node); 1478 if (ret) 1479 return ret; 1480 1481 ret = gic_init_bases(*gic, &dev->of_node->fwnode); 1482 if (ret) { 1483 gic_teardown(*gic); 1484 return ret; 1485 } 1486 1487 irq_domain_set_pm_device((*gic)->domain, dev); 1488 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq, *gic); 1489 1490 return 0; 1491 } 1492 1493 static void __init gic_of_setup_kvm_info(struct device_node *node) 1494 { 1495 int ret; 1496 struct resource *vctrl_res = &gic_v2_kvm_info.vctrl; 1497 struct resource *vcpu_res = &gic_v2_kvm_info.vcpu; 1498 1499 gic_v2_kvm_info.type = GIC_V2; 1500 1501 gic_v2_kvm_info.maint_irq = irq_of_parse_and_map(node, 0); 1502 if (!gic_v2_kvm_info.maint_irq) 1503 return; 1504 1505 ret = of_address_to_resource(node, 2, vctrl_res); 1506 if (ret) 1507 return; 1508 1509 ret = of_address_to_resource(node, 3, vcpu_res); 1510 if (ret) 1511 return; 1512 1513 if (static_branch_likely(&supports_deactivate_key)) 1514 vgic_set_kvm_info(&gic_v2_kvm_info); 1515 } 1516 1517 int __init 1518 gic_of_init(struct device_node *node, struct device_node *parent) 1519 { 1520 struct gic_chip_data *gic; 1521 int irq, ret; 1522 1523 if (WARN_ON(!node)) 1524 return -ENODEV; 1525 1526 if (WARN_ON(gic_cnt >= CONFIG_ARM_GIC_MAX_NR)) 1527 return -EINVAL; 1528 1529 gic = &gic_data[gic_cnt]; 1530 1531 ret = gic_of_setup(gic, node); 1532 if (ret) 1533 return ret; 1534 1535 /* 1536 * Disable split EOI/Deactivate if either HYP is not available 1537 * or the CPU interface is too small. 1538 */ 1539 if (gic_cnt == 0 && !gic_check_eoimode(node, &gic->raw_cpu_base)) 1540 static_branch_disable(&supports_deactivate_key); 1541 1542 ret = __gic_init_bases(gic, &node->fwnode); 1543 if (ret) { 1544 gic_teardown(gic); 1545 return ret; 1546 } 1547 1548 if (!gic_cnt) { 1549 gic_init_physaddr(node); 1550 gic_of_setup_kvm_info(node); 1551 } 1552 1553 if (parent) { 1554 irq = irq_of_parse_and_map(node, 0); 1555 gic_cascade_irq(gic_cnt, irq); 1556 } 1557 1558 if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) 1559 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain); 1560 1561 gic_cnt++; 1562 return 0; 1563 } 1564 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init); 1565 IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init); 1566 IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init); 1567 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init); 1568 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init); 1569 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init); 1570 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init); 1571 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init); 1572 IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init); 1573 #else 1574 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq) 1575 { 1576 return -ENOTSUPP; 1577 } 1578 #endif 1579 1580 #ifdef CONFIG_ACPI 1581 static struct 1582 { 1583 phys_addr_t cpu_phys_base; 1584 u32 maint_irq; 1585 int maint_irq_mode; 1586 phys_addr_t vctrl_base; 1587 phys_addr_t vcpu_base; 1588 } acpi_data __initdata; 1589 1590 static int __init 1591 gic_acpi_parse_madt_cpu(union acpi_subtable_headers *header, 1592 const unsigned long end) 1593 { 1594 struct acpi_madt_generic_interrupt *processor; 1595 phys_addr_t gic_cpu_base; 1596 static int cpu_base_assigned; 1597 1598 processor = (struct acpi_madt_generic_interrupt *)header; 1599 1600 if (BAD_MADT_GICC_ENTRY(processor, end)) 1601 return -EINVAL; 1602 1603 /* 1604 * There is no support for non-banked GICv1/2 register in ACPI spec. 1605 * All CPU interface addresses have to be the same. 1606 */ 1607 gic_cpu_base = processor->base_address; 1608 if (cpu_base_assigned && gic_cpu_base != acpi_data.cpu_phys_base) 1609 return -EINVAL; 1610 1611 acpi_data.cpu_phys_base = gic_cpu_base; 1612 acpi_data.maint_irq = processor->vgic_interrupt; 1613 acpi_data.maint_irq_mode = (processor->flags & ACPI_MADT_VGIC_IRQ_MODE) ? 1614 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE; 1615 acpi_data.vctrl_base = processor->gich_base_address; 1616 acpi_data.vcpu_base = processor->gicv_base_address; 1617 1618 cpu_base_assigned = 1; 1619 return 0; 1620 } 1621 1622 /* The things you have to do to just *count* something... */ 1623 static int __init acpi_dummy_func(union acpi_subtable_headers *header, 1624 const unsigned long end) 1625 { 1626 return 0; 1627 } 1628 1629 static bool __init acpi_gic_redist_is_present(void) 1630 { 1631 return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, 1632 acpi_dummy_func, 0) > 0; 1633 } 1634 1635 static bool __init gic_validate_dist(struct acpi_subtable_header *header, 1636 struct acpi_probe_entry *ape) 1637 { 1638 struct acpi_madt_generic_distributor *dist; 1639 dist = (struct acpi_madt_generic_distributor *)header; 1640 1641 return (dist->version == ape->driver_data && 1642 (dist->version != ACPI_MADT_GIC_VERSION_NONE || 1643 !acpi_gic_redist_is_present())); 1644 } 1645 1646 #define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K) 1647 #define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K) 1648 #define ACPI_GICV2_VCTRL_MEM_SIZE (SZ_4K) 1649 #define ACPI_GICV2_VCPU_MEM_SIZE (SZ_8K) 1650 1651 static void __init gic_acpi_setup_kvm_info(void) 1652 { 1653 int irq; 1654 struct resource *vctrl_res = &gic_v2_kvm_info.vctrl; 1655 struct resource *vcpu_res = &gic_v2_kvm_info.vcpu; 1656 1657 gic_v2_kvm_info.type = GIC_V2; 1658 1659 if (!acpi_data.vctrl_base) 1660 return; 1661 1662 vctrl_res->flags = IORESOURCE_MEM; 1663 vctrl_res->start = acpi_data.vctrl_base; 1664 vctrl_res->end = vctrl_res->start + ACPI_GICV2_VCTRL_MEM_SIZE - 1; 1665 1666 if (!acpi_data.vcpu_base) 1667 return; 1668 1669 vcpu_res->flags = IORESOURCE_MEM; 1670 vcpu_res->start = acpi_data.vcpu_base; 1671 vcpu_res->end = vcpu_res->start + ACPI_GICV2_VCPU_MEM_SIZE - 1; 1672 1673 irq = acpi_register_gsi(NULL, acpi_data.maint_irq, 1674 acpi_data.maint_irq_mode, 1675 ACPI_ACTIVE_HIGH); 1676 if (irq <= 0) 1677 return; 1678 1679 gic_v2_kvm_info.maint_irq = irq; 1680 1681 vgic_set_kvm_info(&gic_v2_kvm_info); 1682 } 1683 1684 static struct fwnode_handle *gsi_domain_handle; 1685 1686 static struct fwnode_handle *gic_v2_get_gsi_domain_id(u32 gsi) 1687 { 1688 return gsi_domain_handle; 1689 } 1690 1691 static int __init gic_v2_acpi_init(union acpi_subtable_headers *header, 1692 const unsigned long end) 1693 { 1694 struct acpi_madt_generic_distributor *dist; 1695 struct gic_chip_data *gic = &gic_data[0]; 1696 int count, ret; 1697 1698 /* Collect CPU base addresses */ 1699 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, 1700 gic_acpi_parse_madt_cpu, 0); 1701 if (count <= 0) { 1702 pr_err("No valid GICC entries exist\n"); 1703 return -EINVAL; 1704 } 1705 1706 gic->raw_cpu_base = ioremap(acpi_data.cpu_phys_base, ACPI_GIC_CPU_IF_MEM_SIZE); 1707 if (!gic->raw_cpu_base) { 1708 pr_err("Unable to map GICC registers\n"); 1709 return -ENOMEM; 1710 } 1711 1712 dist = (struct acpi_madt_generic_distributor *)header; 1713 gic->raw_dist_base = ioremap(dist->base_address, 1714 ACPI_GICV2_DIST_MEM_SIZE); 1715 if (!gic->raw_dist_base) { 1716 pr_err("Unable to map GICD registers\n"); 1717 gic_teardown(gic); 1718 return -ENOMEM; 1719 } 1720 1721 /* 1722 * Disable split EOI/Deactivate if HYP is not available. ACPI 1723 * guarantees that we'll always have a GICv2, so the CPU 1724 * interface will always be the right size. 1725 */ 1726 if (!is_hyp_mode_available()) 1727 static_branch_disable(&supports_deactivate_key); 1728 1729 /* 1730 * Initialize GIC instance zero (no multi-GIC support). 1731 */ 1732 gsi_domain_handle = irq_domain_alloc_fwnode(&dist->base_address); 1733 if (!gsi_domain_handle) { 1734 pr_err("Unable to allocate domain handle\n"); 1735 gic_teardown(gic); 1736 return -ENOMEM; 1737 } 1738 1739 ret = __gic_init_bases(gic, gsi_domain_handle); 1740 if (ret) { 1741 pr_err("Failed to initialise GIC\n"); 1742 irq_domain_free_fwnode(gsi_domain_handle); 1743 gic_teardown(gic); 1744 return ret; 1745 } 1746 1747 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, gic_v2_get_gsi_domain_id); 1748 1749 if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) 1750 gicv2m_init(NULL, gic_data[0].domain); 1751 1752 if (static_branch_likely(&supports_deactivate_key)) 1753 gic_acpi_setup_kvm_info(); 1754 1755 return 0; 1756 } 1757 IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 1758 gic_validate_dist, ACPI_MADT_GIC_VERSION_V2, 1759 gic_v2_acpi_init); 1760 IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 1761 gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE, 1762 gic_v2_acpi_init); 1763 #endif 1764