1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2002 ARM Limited, All Rights Reserved. 4 * 5 * Interrupt architecture for the GIC: 6 * 7 * o There is one Interrupt Distributor, which receives interrupts 8 * from system devices and sends them to the Interrupt Controllers. 9 * 10 * o There is one CPU Interface per CPU, which sends interrupts sent 11 * by the Distributor, and interrupts generated locally, to the 12 * associated CPU. The base address of the CPU interface is usually 13 * aliased so that the same address points to different chips depending 14 * on the CPU it is accessed from. 15 * 16 * Note that IRQs 0-31 are special - they are local to each CPU. 17 * As such, the enable set/clear, pending set/clear and active bit 18 * registers are banked per-cpu for these sources. 19 */ 20 #include <linux/init.h> 21 #include <linux/kernel.h> 22 #include <linux/err.h> 23 #include <linux/module.h> 24 #include <linux/list.h> 25 #include <linux/smp.h> 26 #include <linux/cpu.h> 27 #include <linux/cpu_pm.h> 28 #include <linux/cpumask.h> 29 #include <linux/io.h> 30 #include <linux/of.h> 31 #include <linux/of_address.h> 32 #include <linux/of_irq.h> 33 #include <linux/acpi.h> 34 #include <linux/irqdomain.h> 35 #include <linux/interrupt.h> 36 #include <linux/percpu.h> 37 #include <linux/seq_file.h> 38 #include <linux/slab.h> 39 #include <linux/irqchip.h> 40 #include <linux/irqchip/chained_irq.h> 41 #include <linux/irqchip/arm-gic.h> 42 43 #include <asm/cputype.h> 44 #include <asm/irq.h> 45 #include <asm/exception.h> 46 #include <asm/smp_plat.h> 47 #include <asm/virt.h> 48 49 #include "irq-gic-common.h" 50 51 #ifdef CONFIG_ARM64 52 #include <asm/cpufeature.h> 53 54 static void gic_check_cpu_features(void) 55 { 56 WARN_TAINT_ONCE(this_cpu_has_cap(ARM64_HAS_SYSREG_GIC_CPUIF), 57 TAINT_CPU_OUT_OF_SPEC, 58 "GICv3 system registers enabled, broken firmware!\n"); 59 } 60 #else 61 #define gic_check_cpu_features() do { } while(0) 62 #endif 63 64 union gic_base { 65 void __iomem *common_base; 66 void __percpu * __iomem *percpu_base; 67 }; 68 69 struct gic_chip_data { 70 union gic_base dist_base; 71 union gic_base cpu_base; 72 void __iomem *raw_dist_base; 73 void __iomem *raw_cpu_base; 74 u32 percpu_offset; 75 #if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM) 76 u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)]; 77 u32 saved_spi_active[DIV_ROUND_UP(1020, 32)]; 78 u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)]; 79 u32 saved_spi_target[DIV_ROUND_UP(1020, 4)]; 80 u32 __percpu *saved_ppi_enable; 81 u32 __percpu *saved_ppi_active; 82 u32 __percpu *saved_ppi_conf; 83 #endif 84 struct irq_domain *domain; 85 unsigned int gic_irqs; 86 }; 87 88 #ifdef CONFIG_BL_SWITCHER 89 90 static DEFINE_RAW_SPINLOCK(cpu_map_lock); 91 92 #define gic_lock_irqsave(f) \ 93 raw_spin_lock_irqsave(&cpu_map_lock, (f)) 94 #define gic_unlock_irqrestore(f) \ 95 raw_spin_unlock_irqrestore(&cpu_map_lock, (f)) 96 97 #define gic_lock() raw_spin_lock(&cpu_map_lock) 98 #define gic_unlock() raw_spin_unlock(&cpu_map_lock) 99 100 #else 101 102 #define gic_lock_irqsave(f) do { (void)(f); } while(0) 103 #define gic_unlock_irqrestore(f) do { (void)(f); } while(0) 104 105 #define gic_lock() do { } while(0) 106 #define gic_unlock() do { } while(0) 107 108 #endif 109 110 static DEFINE_STATIC_KEY_FALSE(needs_rmw_access); 111 112 /* 113 * The GIC mapping of CPU interfaces does not necessarily match 114 * the logical CPU numbering. Let's use a mapping as returned 115 * by the GIC itself. 116 */ 117 #define NR_GIC_CPU_IF 8 118 static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly; 119 120 static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key); 121 122 static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly; 123 124 static struct gic_kvm_info gic_v2_kvm_info __initdata; 125 126 static DEFINE_PER_CPU(u32, sgi_intid); 127 128 #ifdef CONFIG_GIC_NON_BANKED 129 static DEFINE_STATIC_KEY_FALSE(frankengic_key); 130 131 static void enable_frankengic(void) 132 { 133 static_branch_enable(&frankengic_key); 134 } 135 136 static inline void __iomem *__get_base(union gic_base *base) 137 { 138 if (static_branch_unlikely(&frankengic_key)) 139 return raw_cpu_read(*base->percpu_base); 140 141 return base->common_base; 142 } 143 144 #define gic_data_dist_base(d) __get_base(&(d)->dist_base) 145 #define gic_data_cpu_base(d) __get_base(&(d)->cpu_base) 146 #else 147 #define gic_data_dist_base(d) ((d)->dist_base.common_base) 148 #define gic_data_cpu_base(d) ((d)->cpu_base.common_base) 149 #define enable_frankengic() do { } while(0) 150 #endif 151 152 static inline void __iomem *gic_dist_base(struct irq_data *d) 153 { 154 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d); 155 return gic_data_dist_base(gic_data); 156 } 157 158 static inline void __iomem *gic_cpu_base(struct irq_data *d) 159 { 160 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d); 161 return gic_data_cpu_base(gic_data); 162 } 163 164 static inline unsigned int gic_irq(struct irq_data *d) 165 { 166 return d->hwirq; 167 } 168 169 static inline bool cascading_gic_irq(struct irq_data *d) 170 { 171 void *data = irq_data_get_irq_handler_data(d); 172 173 /* 174 * If handler_data is set, this is a cascading interrupt, and 175 * it cannot possibly be forwarded. 176 */ 177 return data != NULL; 178 } 179 180 /* 181 * Routines to acknowledge, disable and enable interrupts 182 */ 183 static void gic_poke_irq(struct irq_data *d, u32 offset) 184 { 185 u32 mask = 1 << (gic_irq(d) % 32); 186 writel_relaxed(mask, gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4); 187 } 188 189 static int gic_peek_irq(struct irq_data *d, u32 offset) 190 { 191 u32 mask = 1 << (gic_irq(d) % 32); 192 return !!(readl_relaxed(gic_dist_base(d) + offset + (gic_irq(d) / 32) * 4) & mask); 193 } 194 195 static void gic_mask_irq(struct irq_data *d) 196 { 197 gic_poke_irq(d, GIC_DIST_ENABLE_CLEAR); 198 } 199 200 static void gic_eoimode1_mask_irq(struct irq_data *d) 201 { 202 gic_mask_irq(d); 203 /* 204 * When masking a forwarded interrupt, make sure it is 205 * deactivated as well. 206 * 207 * This ensures that an interrupt that is getting 208 * disabled/masked will not get "stuck", because there is 209 * noone to deactivate it (guest is being terminated). 210 */ 211 if (irqd_is_forwarded_to_vcpu(d)) 212 gic_poke_irq(d, GIC_DIST_ACTIVE_CLEAR); 213 } 214 215 static void gic_unmask_irq(struct irq_data *d) 216 { 217 gic_poke_irq(d, GIC_DIST_ENABLE_SET); 218 } 219 220 static void gic_eoi_irq(struct irq_data *d) 221 { 222 u32 hwirq = gic_irq(d); 223 224 if (hwirq < 16) 225 hwirq = this_cpu_read(sgi_intid); 226 227 writel_relaxed(hwirq, gic_cpu_base(d) + GIC_CPU_EOI); 228 } 229 230 static void gic_eoimode1_eoi_irq(struct irq_data *d) 231 { 232 u32 hwirq = gic_irq(d); 233 234 /* Do not deactivate an IRQ forwarded to a vcpu. */ 235 if (irqd_is_forwarded_to_vcpu(d)) 236 return; 237 238 if (hwirq < 16) 239 hwirq = this_cpu_read(sgi_intid); 240 241 writel_relaxed(hwirq, 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 int ret; 298 299 /* Interrupt configuration for SGIs can't be changed */ 300 if (gicirq < 16) 301 return type != IRQ_TYPE_EDGE_RISING ? -EINVAL : 0; 302 303 /* SPIs have restrictions on the supported types */ 304 if (gicirq >= 32 && type != IRQ_TYPE_LEVEL_HIGH && 305 type != IRQ_TYPE_EDGE_RISING) 306 return -EINVAL; 307 308 ret = gic_configure_irq(gicirq, type, base + GIC_DIST_CONFIG, NULL); 309 if (ret && gicirq < 32) { 310 /* Misconfigured PPIs are usually not fatal */ 311 pr_warn("GIC: PPI%d is secure or misconfigured\n", gicirq - 16); 312 ret = 0; 313 } 314 315 return ret; 316 } 317 318 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu) 319 { 320 /* Only interrupts on the primary GIC can be forwarded to a vcpu. */ 321 if (cascading_gic_irq(d) || gic_irq(d) < 16) 322 return -EINVAL; 323 324 if (vcpu) 325 irqd_set_forwarded_to_vcpu(d); 326 else 327 irqd_clr_forwarded_to_vcpu(d); 328 return 0; 329 } 330 331 static int gic_retrigger(struct irq_data *data) 332 { 333 return !gic_irq_set_irqchip_state(data, IRQCHIP_STATE_PENDING, true); 334 } 335 336 static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) 337 { 338 u32 irqstat, irqnr; 339 struct gic_chip_data *gic = &gic_data[0]; 340 void __iomem *cpu_base = gic_data_cpu_base(gic); 341 342 do { 343 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK); 344 irqnr = irqstat & GICC_IAR_INT_ID_MASK; 345 346 if (unlikely(irqnr >= 1020)) 347 break; 348 349 if (static_branch_likely(&supports_deactivate_key)) 350 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI); 351 isb(); 352 353 /* 354 * Ensure any shared data written by the CPU sending the IPI 355 * is read after we've read the ACK register on the GIC. 356 * 357 * Pairs with the write barrier in gic_ipi_send_mask 358 */ 359 if (irqnr <= 15) { 360 smp_rmb(); 361 362 /* 363 * The GIC encodes the source CPU in GICC_IAR, 364 * leading to the deactivation to fail if not 365 * written back as is to GICC_EOI. Stash the INTID 366 * away for gic_eoi_irq() to write back. This only 367 * works because we don't nest SGIs... 368 */ 369 this_cpu_write(sgi_intid, irqstat); 370 } 371 372 generic_handle_domain_irq(gic->domain, irqnr); 373 } while (1); 374 } 375 376 static void gic_handle_cascade_irq(struct irq_desc *desc) 377 { 378 struct gic_chip_data *chip_data = irq_desc_get_handler_data(desc); 379 struct irq_chip *chip = irq_desc_get_chip(desc); 380 unsigned int gic_irq; 381 unsigned long status; 382 int ret; 383 384 chained_irq_enter(chip, desc); 385 386 status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK); 387 388 gic_irq = (status & GICC_IAR_INT_ID_MASK); 389 if (gic_irq == GICC_INT_SPURIOUS) 390 goto out; 391 392 isb(); 393 ret = generic_handle_domain_irq(chip_data->domain, gic_irq); 394 if (unlikely(ret)) 395 handle_bad_irq(desc); 396 out: 397 chained_irq_exit(chip, desc); 398 } 399 400 static void gic_irq_print_chip(struct irq_data *d, struct seq_file *p) 401 { 402 struct gic_chip_data *gic = irq_data_get_irq_chip_data(d); 403 404 if (gic->domain->dev) 405 seq_printf(p, gic->domain->dev->of_node->name); 406 else 407 seq_printf(p, "GIC-%d", (int)(gic - &gic_data[0])); 408 } 409 410 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq) 411 { 412 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR); 413 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq, 414 &gic_data[gic_nr]); 415 } 416 417 static u8 gic_get_cpumask(struct gic_chip_data *gic) 418 { 419 void __iomem *base = gic_data_dist_base(gic); 420 u32 mask, i; 421 422 for (i = mask = 0; i < 32; i += 4) { 423 mask = readl_relaxed(base + GIC_DIST_TARGET + i); 424 mask |= mask >> 16; 425 mask |= mask >> 8; 426 if (mask) 427 break; 428 } 429 430 if (!mask && num_possible_cpus() > 1) 431 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n"); 432 433 return mask; 434 } 435 436 static bool gic_check_gicv2(void __iomem *base) 437 { 438 u32 val = readl_relaxed(base + GIC_CPU_IDENT); 439 return (val & 0xff0fff) == 0x02043B; 440 } 441 442 static void gic_cpu_if_up(struct gic_chip_data *gic) 443 { 444 void __iomem *cpu_base = gic_data_cpu_base(gic); 445 u32 bypass = 0; 446 u32 mode = 0; 447 int i; 448 449 if (gic == &gic_data[0] && static_branch_likely(&supports_deactivate_key)) 450 mode = GIC_CPU_CTRL_EOImodeNS; 451 452 if (gic_check_gicv2(cpu_base)) 453 for (i = 0; i < 4; i++) 454 writel_relaxed(0, cpu_base + GIC_CPU_ACTIVEPRIO + i * 4); 455 456 /* 457 * Preserve bypass disable bits to be written back later 458 */ 459 bypass = readl(cpu_base + GIC_CPU_CTRL); 460 bypass &= GICC_DIS_BYPASS_MASK; 461 462 writel_relaxed(bypass | mode | GICC_ENABLE, cpu_base + GIC_CPU_CTRL); 463 } 464 465 466 static void gic_dist_init(struct gic_chip_data *gic) 467 { 468 unsigned int i; 469 u32 cpumask; 470 unsigned int gic_irqs = gic->gic_irqs; 471 void __iomem *base = gic_data_dist_base(gic); 472 473 writel_relaxed(GICD_DISABLE, base + GIC_DIST_CTRL); 474 475 /* 476 * Set all global interrupts to this CPU only. 477 */ 478 cpumask = gic_get_cpumask(gic); 479 cpumask |= cpumask << 8; 480 cpumask |= cpumask << 16; 481 for (i = 32; i < gic_irqs; i += 4) 482 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4); 483 484 gic_dist_config(base, gic_irqs, NULL); 485 486 writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL); 487 } 488 489 static int gic_cpu_init(struct gic_chip_data *gic) 490 { 491 void __iomem *dist_base = gic_data_dist_base(gic); 492 void __iomem *base = gic_data_cpu_base(gic); 493 unsigned int cpu_mask, cpu = smp_processor_id(); 494 int i; 495 496 /* 497 * Setting up the CPU map is only relevant for the primary GIC 498 * because any nested/secondary GICs do not directly interface 499 * with the CPU(s). 500 */ 501 if (gic == &gic_data[0]) { 502 /* 503 * Get what the GIC says our CPU mask is. 504 */ 505 if (WARN_ON(cpu >= NR_GIC_CPU_IF)) 506 return -EINVAL; 507 508 gic_check_cpu_features(); 509 cpu_mask = gic_get_cpumask(gic); 510 gic_cpu_map[cpu] = cpu_mask; 511 512 /* 513 * Clear our mask from the other map entries in case they're 514 * still undefined. 515 */ 516 for (i = 0; i < NR_GIC_CPU_IF; i++) 517 if (i != cpu) 518 gic_cpu_map[i] &= ~cpu_mask; 519 } 520 521 gic_cpu_config(dist_base, 32, NULL); 522 523 writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK); 524 gic_cpu_if_up(gic); 525 526 return 0; 527 } 528 529 int gic_cpu_if_down(unsigned int gic_nr) 530 { 531 void __iomem *cpu_base; 532 u32 val = 0; 533 534 if (gic_nr >= CONFIG_ARM_GIC_MAX_NR) 535 return -EINVAL; 536 537 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]); 538 val = readl(cpu_base + GIC_CPU_CTRL); 539 val &= ~GICC_ENABLE; 540 writel_relaxed(val, cpu_base + GIC_CPU_CTRL); 541 542 return 0; 543 } 544 545 #if defined(CONFIG_CPU_PM) || defined(CONFIG_ARM_GIC_PM) 546 /* 547 * Saves the GIC distributor registers during suspend or idle. Must be called 548 * with interrupts disabled but before powering down the GIC. After calling 549 * this function, no interrupts will be delivered by the GIC, and another 550 * platform-specific wakeup source must be enabled. 551 */ 552 void gic_dist_save(struct gic_chip_data *gic) 553 { 554 unsigned int gic_irqs; 555 void __iomem *dist_base; 556 int i; 557 558 if (WARN_ON(!gic)) 559 return; 560 561 gic_irqs = gic->gic_irqs; 562 dist_base = gic_data_dist_base(gic); 563 564 if (!dist_base) 565 return; 566 567 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++) 568 gic->saved_spi_conf[i] = 569 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4); 570 571 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) 572 gic->saved_spi_target[i] = 573 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4); 574 575 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) 576 gic->saved_spi_enable[i] = 577 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); 578 579 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) 580 gic->saved_spi_active[i] = 581 readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4); 582 } 583 584 /* 585 * Restores the GIC distributor registers during resume or when coming out of 586 * idle. Must be called before enabling interrupts. If a level interrupt 587 * that occurred while the GIC was suspended is still present, it will be 588 * handled normally, but any edge interrupts that occurred will not be seen by 589 * the GIC and need to be handled by the platform-specific wakeup source. 590 */ 591 void gic_dist_restore(struct gic_chip_data *gic) 592 { 593 unsigned int gic_irqs; 594 unsigned int i; 595 void __iomem *dist_base; 596 597 if (WARN_ON(!gic)) 598 return; 599 600 gic_irqs = gic->gic_irqs; 601 dist_base = gic_data_dist_base(gic); 602 603 if (!dist_base) 604 return; 605 606 writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL); 607 608 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++) 609 writel_relaxed(gic->saved_spi_conf[i], 610 dist_base + GIC_DIST_CONFIG + i * 4); 611 612 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) 613 writel_relaxed(GICD_INT_DEF_PRI_X4, 614 dist_base + GIC_DIST_PRI + i * 4); 615 616 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) 617 writel_relaxed(gic->saved_spi_target[i], 618 dist_base + GIC_DIST_TARGET + i * 4); 619 620 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) { 621 writel_relaxed(GICD_INT_EN_CLR_X32, 622 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4); 623 writel_relaxed(gic->saved_spi_enable[i], 624 dist_base + GIC_DIST_ENABLE_SET + i * 4); 625 } 626 627 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) { 628 writel_relaxed(GICD_INT_EN_CLR_X32, 629 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4); 630 writel_relaxed(gic->saved_spi_active[i], 631 dist_base + GIC_DIST_ACTIVE_SET + i * 4); 632 } 633 634 writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL); 635 } 636 637 void gic_cpu_save(struct gic_chip_data *gic) 638 { 639 int i; 640 u32 *ptr; 641 void __iomem *dist_base; 642 void __iomem *cpu_base; 643 644 if (WARN_ON(!gic)) 645 return; 646 647 dist_base = gic_data_dist_base(gic); 648 cpu_base = gic_data_cpu_base(gic); 649 650 if (!dist_base || !cpu_base) 651 return; 652 653 ptr = raw_cpu_ptr(gic->saved_ppi_enable); 654 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) 655 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); 656 657 ptr = raw_cpu_ptr(gic->saved_ppi_active); 658 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) 659 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4); 660 661 ptr = raw_cpu_ptr(gic->saved_ppi_conf); 662 for (i = 0; i < DIV_ROUND_UP(32, 16); i++) 663 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4); 664 665 } 666 667 void gic_cpu_restore(struct gic_chip_data *gic) 668 { 669 int i; 670 u32 *ptr; 671 void __iomem *dist_base; 672 void __iomem *cpu_base; 673 674 if (WARN_ON(!gic)) 675 return; 676 677 dist_base = gic_data_dist_base(gic); 678 cpu_base = gic_data_cpu_base(gic); 679 680 if (!dist_base || !cpu_base) 681 return; 682 683 ptr = raw_cpu_ptr(gic->saved_ppi_enable); 684 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) { 685 writel_relaxed(GICD_INT_EN_CLR_X32, 686 dist_base + GIC_DIST_ENABLE_CLEAR + i * 4); 687 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4); 688 } 689 690 ptr = raw_cpu_ptr(gic->saved_ppi_active); 691 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) { 692 writel_relaxed(GICD_INT_EN_CLR_X32, 693 dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4); 694 writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4); 695 } 696 697 ptr = raw_cpu_ptr(gic->saved_ppi_conf); 698 for (i = 0; i < DIV_ROUND_UP(32, 16); i++) 699 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4); 700 701 for (i = 0; i < DIV_ROUND_UP(32, 4); i++) 702 writel_relaxed(GICD_INT_DEF_PRI_X4, 703 dist_base + GIC_DIST_PRI + i * 4); 704 705 writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK); 706 gic_cpu_if_up(gic); 707 } 708 709 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v) 710 { 711 int i; 712 713 for (i = 0; i < CONFIG_ARM_GIC_MAX_NR; i++) { 714 switch (cmd) { 715 case CPU_PM_ENTER: 716 gic_cpu_save(&gic_data[i]); 717 break; 718 case CPU_PM_ENTER_FAILED: 719 case CPU_PM_EXIT: 720 gic_cpu_restore(&gic_data[i]); 721 break; 722 case CPU_CLUSTER_PM_ENTER: 723 gic_dist_save(&gic_data[i]); 724 break; 725 case CPU_CLUSTER_PM_ENTER_FAILED: 726 case CPU_CLUSTER_PM_EXIT: 727 gic_dist_restore(&gic_data[i]); 728 break; 729 } 730 } 731 732 return NOTIFY_OK; 733 } 734 735 static struct notifier_block gic_notifier_block = { 736 .notifier_call = gic_notifier, 737 }; 738 739 static int gic_pm_init(struct gic_chip_data *gic) 740 { 741 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4, 742 sizeof(u32)); 743 if (WARN_ON(!gic->saved_ppi_enable)) 744 return -ENOMEM; 745 746 gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4, 747 sizeof(u32)); 748 if (WARN_ON(!gic->saved_ppi_active)) 749 goto free_ppi_enable; 750 751 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4, 752 sizeof(u32)); 753 if (WARN_ON(!gic->saved_ppi_conf)) 754 goto free_ppi_active; 755 756 if (gic == &gic_data[0]) 757 cpu_pm_register_notifier(&gic_notifier_block); 758 759 return 0; 760 761 free_ppi_active: 762 free_percpu(gic->saved_ppi_active); 763 free_ppi_enable: 764 free_percpu(gic->saved_ppi_enable); 765 766 return -ENOMEM; 767 } 768 #else 769 static int gic_pm_init(struct gic_chip_data *gic) 770 { 771 return 0; 772 } 773 #endif 774 775 #ifdef CONFIG_SMP 776 static void rmw_writeb(u8 bval, void __iomem *addr) 777 { 778 static DEFINE_RAW_SPINLOCK(rmw_lock); 779 unsigned long offset = (unsigned long)addr & 3UL; 780 unsigned long shift = offset * 8; 781 unsigned long flags; 782 u32 val; 783 784 raw_spin_lock_irqsave(&rmw_lock, flags); 785 786 addr -= offset; 787 val = readl_relaxed(addr); 788 val &= ~GENMASK(shift + 7, shift); 789 val |= bval << shift; 790 writel_relaxed(val, addr); 791 792 raw_spin_unlock_irqrestore(&rmw_lock, flags); 793 } 794 795 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, 796 bool force) 797 { 798 void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + gic_irq(d); 799 struct gic_chip_data *gic = irq_data_get_irq_chip_data(d); 800 unsigned int cpu; 801 802 if (unlikely(gic != &gic_data[0])) 803 return -EINVAL; 804 805 if (!force) 806 cpu = cpumask_any_and(mask_val, cpu_online_mask); 807 else 808 cpu = cpumask_first(mask_val); 809 810 if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids) 811 return -EINVAL; 812 813 if (static_branch_unlikely(&needs_rmw_access)) 814 rmw_writeb(gic_cpu_map[cpu], reg); 815 else 816 writeb_relaxed(gic_cpu_map[cpu], reg); 817 irq_data_update_effective_affinity(d, cpumask_of(cpu)); 818 819 return IRQ_SET_MASK_OK_DONE; 820 } 821 822 static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask) 823 { 824 int cpu; 825 unsigned long flags, map = 0; 826 827 if (unlikely(nr_cpu_ids == 1)) { 828 /* Only one CPU? let's do a self-IPI... */ 829 writel_relaxed(2 << 24 | d->hwirq, 830 gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); 831 return; 832 } 833 834 gic_lock_irqsave(flags); 835 836 /* Convert our logical CPU mask into a physical one. */ 837 for_each_cpu(cpu, mask) 838 map |= gic_cpu_map[cpu]; 839 840 /* 841 * Ensure that stores to Normal memory are visible to the 842 * other CPUs before they observe us issuing the IPI. 843 */ 844 dmb(ishst); 845 846 /* this always happens on GIC0 */ 847 writel_relaxed(map << 16 | d->hwirq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); 848 849 gic_unlock_irqrestore(flags); 850 } 851 852 static int gic_starting_cpu(unsigned int cpu) 853 { 854 gic_cpu_init(&gic_data[0]); 855 return 0; 856 } 857 858 static __init void gic_smp_init(void) 859 { 860 struct irq_fwspec sgi_fwspec = { 861 .fwnode = gic_data[0].domain->fwnode, 862 .param_count = 1, 863 }; 864 int base_sgi; 865 866 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING, 867 "irqchip/arm/gic:starting", 868 gic_starting_cpu, NULL); 869 870 base_sgi = __irq_domain_alloc_irqs(gic_data[0].domain, -1, 8, 871 NUMA_NO_NODE, &sgi_fwspec, 872 false, NULL); 873 if (WARN_ON(base_sgi <= 0)) 874 return; 875 876 set_smp_ipi_range(base_sgi, 8); 877 } 878 #else 879 #define gic_smp_init() do { } while(0) 880 #define gic_set_affinity NULL 881 #define gic_ipi_send_mask NULL 882 #endif 883 884 static const struct irq_chip gic_chip = { 885 .irq_mask = gic_mask_irq, 886 .irq_unmask = gic_unmask_irq, 887 .irq_eoi = gic_eoi_irq, 888 .irq_set_type = gic_set_type, 889 .irq_retrigger = gic_retrigger, 890 .irq_set_affinity = gic_set_affinity, 891 .ipi_send_mask = gic_ipi_send_mask, 892 .irq_get_irqchip_state = gic_irq_get_irqchip_state, 893 .irq_set_irqchip_state = gic_irq_set_irqchip_state, 894 .irq_print_chip = gic_irq_print_chip, 895 .flags = IRQCHIP_SET_TYPE_MASKED | 896 IRQCHIP_SKIP_SET_WAKE | 897 IRQCHIP_MASK_ON_SUSPEND, 898 }; 899 900 static const struct irq_chip gic_chip_mode1 = { 901 .name = "GICv2", 902 .irq_mask = gic_eoimode1_mask_irq, 903 .irq_unmask = gic_unmask_irq, 904 .irq_eoi = gic_eoimode1_eoi_irq, 905 .irq_set_type = gic_set_type, 906 .irq_retrigger = gic_retrigger, 907 .irq_set_affinity = gic_set_affinity, 908 .ipi_send_mask = gic_ipi_send_mask, 909 .irq_get_irqchip_state = gic_irq_get_irqchip_state, 910 .irq_set_irqchip_state = gic_irq_set_irqchip_state, 911 .irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity, 912 .flags = IRQCHIP_SET_TYPE_MASKED | 913 IRQCHIP_SKIP_SET_WAKE | 914 IRQCHIP_MASK_ON_SUSPEND, 915 }; 916 917 #ifdef CONFIG_BL_SWITCHER 918 /* 919 * gic_send_sgi - send a SGI directly to given CPU interface number 920 * 921 * cpu_id: the ID for the destination CPU interface 922 * irq: the IPI number to send a SGI for 923 */ 924 void gic_send_sgi(unsigned int cpu_id, unsigned int irq) 925 { 926 BUG_ON(cpu_id >= NR_GIC_CPU_IF); 927 cpu_id = 1 << cpu_id; 928 /* this always happens on GIC0 */ 929 writel_relaxed((cpu_id << 16) | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); 930 } 931 932 /* 933 * gic_get_cpu_id - get the CPU interface ID for the specified CPU 934 * 935 * @cpu: the logical CPU number to get the GIC ID for. 936 * 937 * Return the CPU interface ID for the given logical CPU number, 938 * or -1 if the CPU number is too large or the interface ID is 939 * unknown (more than one bit set). 940 */ 941 int gic_get_cpu_id(unsigned int cpu) 942 { 943 unsigned int cpu_bit; 944 945 if (cpu >= NR_GIC_CPU_IF) 946 return -1; 947 cpu_bit = gic_cpu_map[cpu]; 948 if (cpu_bit & (cpu_bit - 1)) 949 return -1; 950 return __ffs(cpu_bit); 951 } 952 953 /* 954 * gic_migrate_target - migrate IRQs to another CPU interface 955 * 956 * @new_cpu_id: the CPU target ID to migrate IRQs to 957 * 958 * Migrate all peripheral interrupts with a target matching the current CPU 959 * to the interface corresponding to @new_cpu_id. The CPU interface mapping 960 * is also updated. Targets to other CPU interfaces are unchanged. 961 * This must be called with IRQs locally disabled. 962 */ 963 void gic_migrate_target(unsigned int new_cpu_id) 964 { 965 unsigned int cur_cpu_id, gic_irqs, gic_nr = 0; 966 void __iomem *dist_base; 967 int i, ror_val, cpu = smp_processor_id(); 968 u32 val, cur_target_mask, active_mask; 969 970 BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR); 971 972 dist_base = gic_data_dist_base(&gic_data[gic_nr]); 973 if (!dist_base) 974 return; 975 gic_irqs = gic_data[gic_nr].gic_irqs; 976 977 cur_cpu_id = __ffs(gic_cpu_map[cpu]); 978 cur_target_mask = 0x01010101 << cur_cpu_id; 979 ror_val = (cur_cpu_id - new_cpu_id) & 31; 980 981 gic_lock(); 982 983 /* Update the target interface for this logical CPU */ 984 gic_cpu_map[cpu] = 1 << new_cpu_id; 985 986 /* 987 * Find all the peripheral interrupts targeting the current 988 * CPU interface and migrate them to the new CPU interface. 989 * We skip DIST_TARGET 0 to 7 as they are read-only. 990 */ 991 for (i = 8; i < DIV_ROUND_UP(gic_irqs, 4); i++) { 992 val = readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4); 993 active_mask = val & cur_target_mask; 994 if (active_mask) { 995 val &= ~active_mask; 996 val |= ror32(active_mask, ror_val); 997 writel_relaxed(val, dist_base + GIC_DIST_TARGET + i*4); 998 } 999 } 1000 1001 gic_unlock(); 1002 1003 /* 1004 * Now let's migrate and clear any potential SGIs that might be 1005 * pending for us (cur_cpu_id). Since GIC_DIST_SGI_PENDING_SET 1006 * is a banked register, we can only forward the SGI using 1007 * GIC_DIST_SOFTINT. The original SGI source is lost but Linux 1008 * doesn't use that information anyway. 1009 * 1010 * For the same reason we do not adjust SGI source information 1011 * for previously sent SGIs by us to other CPUs either. 1012 */ 1013 for (i = 0; i < 16; i += 4) { 1014 int j; 1015 val = readl_relaxed(dist_base + GIC_DIST_SGI_PENDING_SET + i); 1016 if (!val) 1017 continue; 1018 writel_relaxed(val, dist_base + GIC_DIST_SGI_PENDING_CLEAR + i); 1019 for (j = i; j < i + 4; j++) { 1020 if (val & 0xff) 1021 writel_relaxed((1 << (new_cpu_id + 16)) | j, 1022 dist_base + GIC_DIST_SOFTINT); 1023 val >>= 8; 1024 } 1025 } 1026 } 1027 1028 /* 1029 * gic_get_sgir_physaddr - get the physical address for the SGI register 1030 * 1031 * Return the physical address of the SGI register to be used 1032 * by some early assembly code when the kernel is not yet available. 1033 */ 1034 static unsigned long gic_dist_physaddr; 1035 1036 unsigned long gic_get_sgir_physaddr(void) 1037 { 1038 if (!gic_dist_physaddr) 1039 return 0; 1040 return gic_dist_physaddr + GIC_DIST_SOFTINT; 1041 } 1042 1043 static void __init gic_init_physaddr(struct device_node *node) 1044 { 1045 struct resource res; 1046 if (of_address_to_resource(node, 0, &res) == 0) { 1047 gic_dist_physaddr = res.start; 1048 pr_info("GIC physical location is %#lx\n", gic_dist_physaddr); 1049 } 1050 } 1051 1052 #else 1053 #define gic_init_physaddr(node) do { } while (0) 1054 #endif 1055 1056 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq, 1057 irq_hw_number_t hw) 1058 { 1059 struct gic_chip_data *gic = d->host_data; 1060 struct irq_data *irqd = irq_desc_get_irq_data(irq_to_desc(irq)); 1061 const struct irq_chip *chip; 1062 1063 chip = (static_branch_likely(&supports_deactivate_key) && 1064 gic == &gic_data[0]) ? &gic_chip_mode1 : &gic_chip; 1065 1066 switch (hw) { 1067 case 0 ... 31: 1068 irq_set_percpu_devid(irq); 1069 irq_domain_set_info(d, irq, hw, chip, d->host_data, 1070 handle_percpu_devid_irq, NULL, NULL); 1071 break; 1072 default: 1073 irq_domain_set_info(d, irq, hw, chip, d->host_data, 1074 handle_fasteoi_irq, NULL, NULL); 1075 irq_set_probe(irq); 1076 irqd_set_single_target(irqd); 1077 break; 1078 } 1079 1080 /* Prevents SW retriggers which mess up the ACK/EOI ordering */ 1081 irqd_set_handle_enforce_irqctx(irqd); 1082 return 0; 1083 } 1084 1085 static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq) 1086 { 1087 } 1088 1089 static int gic_irq_domain_translate(struct irq_domain *d, 1090 struct irq_fwspec *fwspec, 1091 unsigned long *hwirq, 1092 unsigned int *type) 1093 { 1094 if (fwspec->param_count == 1 && fwspec->param[0] < 16) { 1095 *hwirq = fwspec->param[0]; 1096 *type = IRQ_TYPE_EDGE_RISING; 1097 return 0; 1098 } 1099 1100 if (is_of_node(fwspec->fwnode)) { 1101 if (fwspec->param_count < 3) 1102 return -EINVAL; 1103 1104 switch (fwspec->param[0]) { 1105 case 0: /* SPI */ 1106 *hwirq = fwspec->param[1] + 32; 1107 break; 1108 case 1: /* PPI */ 1109 *hwirq = fwspec->param[1] + 16; 1110 break; 1111 default: 1112 return -EINVAL; 1113 } 1114 1115 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; 1116 1117 /* Make it clear that broken DTs are... broken */ 1118 WARN(*type == IRQ_TYPE_NONE, 1119 "HW irq %ld has invalid type\n", *hwirq); 1120 return 0; 1121 } 1122 1123 if (is_fwnode_irqchip(fwspec->fwnode)) { 1124 if(fwspec->param_count != 2) 1125 return -EINVAL; 1126 1127 if (fwspec->param[0] < 16) { 1128 pr_err(FW_BUG "Illegal GSI%d translation request\n", 1129 fwspec->param[0]); 1130 return -EINVAL; 1131 } 1132 1133 *hwirq = fwspec->param[0]; 1134 *type = fwspec->param[1]; 1135 1136 WARN(*type == IRQ_TYPE_NONE, 1137 "HW irq %ld has invalid type\n", *hwirq); 1138 return 0; 1139 } 1140 1141 return -EINVAL; 1142 } 1143 1144 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, 1145 unsigned int nr_irqs, void *arg) 1146 { 1147 int i, ret; 1148 irq_hw_number_t hwirq; 1149 unsigned int type = IRQ_TYPE_NONE; 1150 struct irq_fwspec *fwspec = arg; 1151 1152 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type); 1153 if (ret) 1154 return ret; 1155 1156 for (i = 0; i < nr_irqs; i++) { 1157 ret = gic_irq_domain_map(domain, virq + i, hwirq + i); 1158 if (ret) 1159 return ret; 1160 } 1161 1162 return 0; 1163 } 1164 1165 static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = { 1166 .translate = gic_irq_domain_translate, 1167 .alloc = gic_irq_domain_alloc, 1168 .free = irq_domain_free_irqs_top, 1169 }; 1170 1171 static const struct irq_domain_ops gic_irq_domain_ops = { 1172 .map = gic_irq_domain_map, 1173 .unmap = gic_irq_domain_unmap, 1174 }; 1175 1176 static int gic_init_bases(struct gic_chip_data *gic, 1177 struct fwnode_handle *handle) 1178 { 1179 int gic_irqs, ret; 1180 1181 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) { 1182 /* Frankein-GIC without banked registers... */ 1183 unsigned int cpu; 1184 1185 gic->dist_base.percpu_base = alloc_percpu(void __iomem *); 1186 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *); 1187 if (WARN_ON(!gic->dist_base.percpu_base || 1188 !gic->cpu_base.percpu_base)) { 1189 ret = -ENOMEM; 1190 goto error; 1191 } 1192 1193 for_each_possible_cpu(cpu) { 1194 u32 mpidr = cpu_logical_map(cpu); 1195 u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0); 1196 unsigned long offset = gic->percpu_offset * core_id; 1197 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = 1198 gic->raw_dist_base + offset; 1199 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = 1200 gic->raw_cpu_base + offset; 1201 } 1202 1203 enable_frankengic(); 1204 } else { 1205 /* Normal, sane GIC... */ 1206 WARN(gic->percpu_offset, 1207 "GIC_NON_BANKED not enabled, ignoring %08x offset!", 1208 gic->percpu_offset); 1209 gic->dist_base.common_base = gic->raw_dist_base; 1210 gic->cpu_base.common_base = gic->raw_cpu_base; 1211 } 1212 1213 /* 1214 * Find out how many interrupts are supported. 1215 * The GIC only supports up to 1020 interrupt sources. 1216 */ 1217 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f; 1218 gic_irqs = (gic_irqs + 1) * 32; 1219 if (gic_irqs > 1020) 1220 gic_irqs = 1020; 1221 gic->gic_irqs = gic_irqs; 1222 1223 if (handle) { /* DT/ACPI */ 1224 gic->domain = irq_domain_create_linear(handle, gic_irqs, 1225 &gic_irq_domain_hierarchy_ops, 1226 gic); 1227 } else { /* Legacy support */ 1228 /* 1229 * For primary GICs, skip over SGIs. 1230 * No secondary GIC support whatsoever. 1231 */ 1232 int irq_base; 1233 1234 gic_irqs -= 16; /* calculate # of irqs to allocate */ 1235 1236 irq_base = irq_alloc_descs(16, 16, gic_irqs, 1237 numa_node_id()); 1238 if (irq_base < 0) { 1239 WARN(1, "Cannot allocate irq_descs @ IRQ16, assuming pre-allocated\n"); 1240 irq_base = 16; 1241 } 1242 1243 gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base, 1244 16, &gic_irq_domain_ops, gic); 1245 } 1246 1247 if (WARN_ON(!gic->domain)) { 1248 ret = -ENODEV; 1249 goto error; 1250 } 1251 1252 gic_dist_init(gic); 1253 ret = gic_cpu_init(gic); 1254 if (ret) 1255 goto error; 1256 1257 ret = gic_pm_init(gic); 1258 if (ret) 1259 goto error; 1260 1261 return 0; 1262 1263 error: 1264 if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) { 1265 free_percpu(gic->dist_base.percpu_base); 1266 free_percpu(gic->cpu_base.percpu_base); 1267 } 1268 1269 return ret; 1270 } 1271 1272 static int __init __gic_init_bases(struct gic_chip_data *gic, 1273 struct fwnode_handle *handle) 1274 { 1275 int i, ret; 1276 1277 if (WARN_ON(!gic || gic->domain)) 1278 return -EINVAL; 1279 1280 if (gic == &gic_data[0]) { 1281 /* 1282 * Initialize the CPU interface map to all CPUs. 1283 * It will be refined as each CPU probes its ID. 1284 * This is only necessary for the primary GIC. 1285 */ 1286 for (i = 0; i < NR_GIC_CPU_IF; i++) 1287 gic_cpu_map[i] = 0xff; 1288 1289 set_handle_irq(gic_handle_irq); 1290 if (static_branch_likely(&supports_deactivate_key)) 1291 pr_info("GIC: Using split EOI/Deactivate mode\n"); 1292 } 1293 1294 ret = gic_init_bases(gic, handle); 1295 if (gic == &gic_data[0]) 1296 gic_smp_init(); 1297 1298 return ret; 1299 } 1300 1301 void __init gic_init(void __iomem *dist_base, void __iomem *cpu_base) 1302 { 1303 struct gic_chip_data *gic; 1304 1305 /* 1306 * Non-DT/ACPI systems won't run a hypervisor, so let's not 1307 * bother with these... 1308 */ 1309 static_branch_disable(&supports_deactivate_key); 1310 1311 gic = &gic_data[0]; 1312 gic->raw_dist_base = dist_base; 1313 gic->raw_cpu_base = cpu_base; 1314 1315 __gic_init_bases(gic, NULL); 1316 } 1317 1318 static void gic_teardown(struct gic_chip_data *gic) 1319 { 1320 if (WARN_ON(!gic)) 1321 return; 1322 1323 if (gic->raw_dist_base) 1324 iounmap(gic->raw_dist_base); 1325 if (gic->raw_cpu_base) 1326 iounmap(gic->raw_cpu_base); 1327 } 1328 1329 #ifdef CONFIG_OF 1330 static int gic_cnt __initdata; 1331 static bool gicv2_force_probe; 1332 1333 static int __init gicv2_force_probe_cfg(char *buf) 1334 { 1335 return strtobool(buf, &gicv2_force_probe); 1336 } 1337 early_param("irqchip.gicv2_force_probe", gicv2_force_probe_cfg); 1338 1339 static bool gic_check_eoimode(struct device_node *node, void __iomem **base) 1340 { 1341 struct resource cpuif_res; 1342 1343 of_address_to_resource(node, 1, &cpuif_res); 1344 1345 if (!is_hyp_mode_available()) 1346 return false; 1347 if (resource_size(&cpuif_res) < SZ_8K) { 1348 void __iomem *alt; 1349 /* 1350 * Check for a stupid firmware that only exposes the 1351 * first page of a GICv2. 1352 */ 1353 if (!gic_check_gicv2(*base)) 1354 return false; 1355 1356 if (!gicv2_force_probe) { 1357 pr_warn("GIC: GICv2 detected, but range too small and irqchip.gicv2_force_probe not set\n"); 1358 return false; 1359 } 1360 1361 alt = ioremap(cpuif_res.start, SZ_8K); 1362 if (!alt) 1363 return false; 1364 if (!gic_check_gicv2(alt + SZ_4K)) { 1365 /* 1366 * The first page was that of a GICv2, and 1367 * the second was *something*. Let's trust it 1368 * to be a GICv2, and update the mapping. 1369 */ 1370 pr_warn("GIC: GICv2 at %pa, but range is too small (broken DT?), assuming 8kB\n", 1371 &cpuif_res.start); 1372 iounmap(*base); 1373 *base = alt; 1374 return true; 1375 } 1376 1377 /* 1378 * We detected *two* initial GICv2 pages in a 1379 * row. Could be a GICv2 aliased over two 64kB 1380 * pages. Update the resource, map the iospace, and 1381 * pray. 1382 */ 1383 iounmap(alt); 1384 alt = ioremap(cpuif_res.start, SZ_128K); 1385 if (!alt) 1386 return false; 1387 pr_warn("GIC: Aliased GICv2 at %pa, trying to find the canonical range over 128kB\n", 1388 &cpuif_res.start); 1389 cpuif_res.end = cpuif_res.start + SZ_128K -1; 1390 iounmap(*base); 1391 *base = alt; 1392 } 1393 if (resource_size(&cpuif_res) == SZ_128K) { 1394 /* 1395 * Verify that we have the first 4kB of a GICv2 1396 * aliased over the first 64kB by checking the 1397 * GICC_IIDR register on both ends. 1398 */ 1399 if (!gic_check_gicv2(*base) || 1400 !gic_check_gicv2(*base + 0xf000)) 1401 return false; 1402 1403 /* 1404 * Move the base up by 60kB, so that we have a 8kB 1405 * contiguous region, which allows us to use GICC_DIR 1406 * at its normal offset. Please pass me that bucket. 1407 */ 1408 *base += 0xf000; 1409 cpuif_res.start += 0xf000; 1410 pr_warn("GIC: Adjusting CPU interface base to %pa\n", 1411 &cpuif_res.start); 1412 } 1413 1414 return true; 1415 } 1416 1417 static bool gic_enable_rmw_access(void *data) 1418 { 1419 /* 1420 * The EMEV2 class of machines has a broken interconnect, and 1421 * locks up on accesses that are less than 32bit. So far, only 1422 * the affinity setting requires it. 1423 */ 1424 if (of_machine_is_compatible("renesas,emev2")) { 1425 static_branch_enable(&needs_rmw_access); 1426 return true; 1427 } 1428 1429 return false; 1430 } 1431 1432 static const struct gic_quirk gic_quirks[] = { 1433 { 1434 .desc = "broken byte access", 1435 .compatible = "arm,pl390", 1436 .init = gic_enable_rmw_access, 1437 }, 1438 { }, 1439 }; 1440 1441 static int gic_of_setup(struct gic_chip_data *gic, struct device_node *node) 1442 { 1443 if (!gic || !node) 1444 return -EINVAL; 1445 1446 gic->raw_dist_base = of_iomap(node, 0); 1447 if (WARN(!gic->raw_dist_base, "unable to map gic dist registers\n")) 1448 goto error; 1449 1450 gic->raw_cpu_base = of_iomap(node, 1); 1451 if (WARN(!gic->raw_cpu_base, "unable to map gic cpu registers\n")) 1452 goto error; 1453 1454 if (of_property_read_u32(node, "cpu-offset", &gic->percpu_offset)) 1455 gic->percpu_offset = 0; 1456 1457 gic_enable_of_quirks(node, gic_quirks, gic); 1458 1459 return 0; 1460 1461 error: 1462 gic_teardown(gic); 1463 1464 return -ENOMEM; 1465 } 1466 1467 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq) 1468 { 1469 int ret; 1470 1471 if (!dev || !dev->of_node || !gic || !irq) 1472 return -EINVAL; 1473 1474 *gic = devm_kzalloc(dev, sizeof(**gic), GFP_KERNEL); 1475 if (!*gic) 1476 return -ENOMEM; 1477 1478 ret = gic_of_setup(*gic, dev->of_node); 1479 if (ret) 1480 return ret; 1481 1482 ret = gic_init_bases(*gic, &dev->of_node->fwnode); 1483 if (ret) { 1484 gic_teardown(*gic); 1485 return ret; 1486 } 1487 1488 irq_domain_set_pm_device((*gic)->domain, dev); 1489 irq_set_chained_handler_and_data(irq, gic_handle_cascade_irq, *gic); 1490 1491 return 0; 1492 } 1493 1494 static void __init gic_of_setup_kvm_info(struct device_node *node) 1495 { 1496 int ret; 1497 struct resource *vctrl_res = &gic_v2_kvm_info.vctrl; 1498 struct resource *vcpu_res = &gic_v2_kvm_info.vcpu; 1499 1500 gic_v2_kvm_info.type = GIC_V2; 1501 1502 gic_v2_kvm_info.maint_irq = irq_of_parse_and_map(node, 0); 1503 if (!gic_v2_kvm_info.maint_irq) 1504 return; 1505 1506 ret = of_address_to_resource(node, 2, vctrl_res); 1507 if (ret) 1508 return; 1509 1510 ret = of_address_to_resource(node, 3, vcpu_res); 1511 if (ret) 1512 return; 1513 1514 if (static_branch_likely(&supports_deactivate_key)) 1515 vgic_set_kvm_info(&gic_v2_kvm_info); 1516 } 1517 1518 int __init 1519 gic_of_init(struct device_node *node, struct device_node *parent) 1520 { 1521 struct gic_chip_data *gic; 1522 int irq, ret; 1523 1524 if (WARN_ON(!node)) 1525 return -ENODEV; 1526 1527 if (WARN_ON(gic_cnt >= CONFIG_ARM_GIC_MAX_NR)) 1528 return -EINVAL; 1529 1530 gic = &gic_data[gic_cnt]; 1531 1532 ret = gic_of_setup(gic, node); 1533 if (ret) 1534 return ret; 1535 1536 /* 1537 * Disable split EOI/Deactivate if either HYP is not available 1538 * or the CPU interface is too small. 1539 */ 1540 if (gic_cnt == 0 && !gic_check_eoimode(node, &gic->raw_cpu_base)) 1541 static_branch_disable(&supports_deactivate_key); 1542 1543 ret = __gic_init_bases(gic, &node->fwnode); 1544 if (ret) { 1545 gic_teardown(gic); 1546 return ret; 1547 } 1548 1549 if (!gic_cnt) { 1550 gic_init_physaddr(node); 1551 gic_of_setup_kvm_info(node); 1552 } 1553 1554 if (parent) { 1555 irq = irq_of_parse_and_map(node, 0); 1556 gic_cascade_irq(gic_cnt, irq); 1557 } 1558 1559 if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) 1560 gicv2m_init(&node->fwnode, gic_data[gic_cnt].domain); 1561 1562 gic_cnt++; 1563 return 0; 1564 } 1565 IRQCHIP_DECLARE(gic_400, "arm,gic-400", gic_of_init); 1566 IRQCHIP_DECLARE(arm11mp_gic, "arm,arm11mp-gic", gic_of_init); 1567 IRQCHIP_DECLARE(arm1176jzf_dc_gic, "arm,arm1176jzf-devchip-gic", gic_of_init); 1568 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init); 1569 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init); 1570 IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init); 1571 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init); 1572 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init); 1573 IRQCHIP_DECLARE(pl390, "arm,pl390", gic_of_init); 1574 #else 1575 int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq) 1576 { 1577 return -ENOTSUPP; 1578 } 1579 #endif 1580 1581 #ifdef CONFIG_ACPI 1582 static struct 1583 { 1584 phys_addr_t cpu_phys_base; 1585 u32 maint_irq; 1586 int maint_irq_mode; 1587 phys_addr_t vctrl_base; 1588 phys_addr_t vcpu_base; 1589 } acpi_data __initdata; 1590 1591 static int __init 1592 gic_acpi_parse_madt_cpu(union acpi_subtable_headers *header, 1593 const unsigned long end) 1594 { 1595 struct acpi_madt_generic_interrupt *processor; 1596 phys_addr_t gic_cpu_base; 1597 static int cpu_base_assigned; 1598 1599 processor = (struct acpi_madt_generic_interrupt *)header; 1600 1601 if (BAD_MADT_GICC_ENTRY(processor, end)) 1602 return -EINVAL; 1603 1604 /* 1605 * There is no support for non-banked GICv1/2 register in ACPI spec. 1606 * All CPU interface addresses have to be the same. 1607 */ 1608 gic_cpu_base = processor->base_address; 1609 if (cpu_base_assigned && gic_cpu_base != acpi_data.cpu_phys_base) 1610 return -EINVAL; 1611 1612 acpi_data.cpu_phys_base = gic_cpu_base; 1613 acpi_data.maint_irq = processor->vgic_interrupt; 1614 acpi_data.maint_irq_mode = (processor->flags & ACPI_MADT_VGIC_IRQ_MODE) ? 1615 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE; 1616 acpi_data.vctrl_base = processor->gich_base_address; 1617 acpi_data.vcpu_base = processor->gicv_base_address; 1618 1619 cpu_base_assigned = 1; 1620 return 0; 1621 } 1622 1623 /* The things you have to do to just *count* something... */ 1624 static int __init acpi_dummy_func(union acpi_subtable_headers *header, 1625 const unsigned long end) 1626 { 1627 return 0; 1628 } 1629 1630 static bool __init acpi_gic_redist_is_present(void) 1631 { 1632 return acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, 1633 acpi_dummy_func, 0) > 0; 1634 } 1635 1636 static bool __init gic_validate_dist(struct acpi_subtable_header *header, 1637 struct acpi_probe_entry *ape) 1638 { 1639 struct acpi_madt_generic_distributor *dist; 1640 dist = (struct acpi_madt_generic_distributor *)header; 1641 1642 return (dist->version == ape->driver_data && 1643 (dist->version != ACPI_MADT_GIC_VERSION_NONE || 1644 !acpi_gic_redist_is_present())); 1645 } 1646 1647 #define ACPI_GICV2_DIST_MEM_SIZE (SZ_4K) 1648 #define ACPI_GIC_CPU_IF_MEM_SIZE (SZ_8K) 1649 #define ACPI_GICV2_VCTRL_MEM_SIZE (SZ_4K) 1650 #define ACPI_GICV2_VCPU_MEM_SIZE (SZ_8K) 1651 1652 static void __init gic_acpi_setup_kvm_info(void) 1653 { 1654 int irq; 1655 struct resource *vctrl_res = &gic_v2_kvm_info.vctrl; 1656 struct resource *vcpu_res = &gic_v2_kvm_info.vcpu; 1657 1658 gic_v2_kvm_info.type = GIC_V2; 1659 1660 if (!acpi_data.vctrl_base) 1661 return; 1662 1663 vctrl_res->flags = IORESOURCE_MEM; 1664 vctrl_res->start = acpi_data.vctrl_base; 1665 vctrl_res->end = vctrl_res->start + ACPI_GICV2_VCTRL_MEM_SIZE - 1; 1666 1667 if (!acpi_data.vcpu_base) 1668 return; 1669 1670 vcpu_res->flags = IORESOURCE_MEM; 1671 vcpu_res->start = acpi_data.vcpu_base; 1672 vcpu_res->end = vcpu_res->start + ACPI_GICV2_VCPU_MEM_SIZE - 1; 1673 1674 irq = acpi_register_gsi(NULL, acpi_data.maint_irq, 1675 acpi_data.maint_irq_mode, 1676 ACPI_ACTIVE_HIGH); 1677 if (irq <= 0) 1678 return; 1679 1680 gic_v2_kvm_info.maint_irq = irq; 1681 1682 vgic_set_kvm_info(&gic_v2_kvm_info); 1683 } 1684 1685 static int __init gic_v2_acpi_init(union acpi_subtable_headers *header, 1686 const unsigned long end) 1687 { 1688 struct acpi_madt_generic_distributor *dist; 1689 struct fwnode_handle *domain_handle; 1690 struct gic_chip_data *gic = &gic_data[0]; 1691 int count, ret; 1692 1693 /* Collect CPU base addresses */ 1694 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, 1695 gic_acpi_parse_madt_cpu, 0); 1696 if (count <= 0) { 1697 pr_err("No valid GICC entries exist\n"); 1698 return -EINVAL; 1699 } 1700 1701 gic->raw_cpu_base = ioremap(acpi_data.cpu_phys_base, ACPI_GIC_CPU_IF_MEM_SIZE); 1702 if (!gic->raw_cpu_base) { 1703 pr_err("Unable to map GICC registers\n"); 1704 return -ENOMEM; 1705 } 1706 1707 dist = (struct acpi_madt_generic_distributor *)header; 1708 gic->raw_dist_base = ioremap(dist->base_address, 1709 ACPI_GICV2_DIST_MEM_SIZE); 1710 if (!gic->raw_dist_base) { 1711 pr_err("Unable to map GICD registers\n"); 1712 gic_teardown(gic); 1713 return -ENOMEM; 1714 } 1715 1716 /* 1717 * Disable split EOI/Deactivate if HYP is not available. ACPI 1718 * guarantees that we'll always have a GICv2, so the CPU 1719 * interface will always be the right size. 1720 */ 1721 if (!is_hyp_mode_available()) 1722 static_branch_disable(&supports_deactivate_key); 1723 1724 /* 1725 * Initialize GIC instance zero (no multi-GIC support). 1726 */ 1727 domain_handle = irq_domain_alloc_fwnode(&dist->base_address); 1728 if (!domain_handle) { 1729 pr_err("Unable to allocate domain handle\n"); 1730 gic_teardown(gic); 1731 return -ENOMEM; 1732 } 1733 1734 ret = __gic_init_bases(gic, domain_handle); 1735 if (ret) { 1736 pr_err("Failed to initialise GIC\n"); 1737 irq_domain_free_fwnode(domain_handle); 1738 gic_teardown(gic); 1739 return ret; 1740 } 1741 1742 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle); 1743 1744 if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) 1745 gicv2m_init(NULL, gic_data[0].domain); 1746 1747 if (static_branch_likely(&supports_deactivate_key)) 1748 gic_acpi_setup_kvm_info(); 1749 1750 return 0; 1751 } 1752 IRQCHIP_ACPI_DECLARE(gic_v2, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 1753 gic_validate_dist, ACPI_MADT_GIC_VERSION_V2, 1754 gic_v2_acpi_init); 1755 IRQCHIP_ACPI_DECLARE(gic_v2_maybe, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 1756 gic_validate_dist, ACPI_MADT_GIC_VERSION_NONE, 1757 gic_v2_acpi_init); 1758 #endif 1759