1 /* 2 * Copyright (C) 2013-2017 ARM Limited, All Rights Reserved. 3 * Author: Marc Zyngier <marc.zyngier@arm.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #define pr_fmt(fmt) "GICv3: " fmt 19 20 #include <linux/acpi.h> 21 #include <linux/cpu.h> 22 #include <linux/cpu_pm.h> 23 #include <linux/delay.h> 24 #include <linux/interrupt.h> 25 #include <linux/irqdomain.h> 26 #include <linux/of.h> 27 #include <linux/of_address.h> 28 #include <linux/of_irq.h> 29 #include <linux/percpu.h> 30 #include <linux/slab.h> 31 32 #include <linux/irqchip.h> 33 #include <linux/irqchip/arm-gic-common.h> 34 #include <linux/irqchip/arm-gic-v3.h> 35 #include <linux/irqchip/irq-partition-percpu.h> 36 37 #include <asm/cputype.h> 38 #include <asm/exception.h> 39 #include <asm/smp_plat.h> 40 #include <asm/virt.h> 41 42 #include "irq-gic-common.h" 43 44 struct redist_region { 45 void __iomem *redist_base; 46 phys_addr_t phys_base; 47 bool single_redist; 48 }; 49 50 struct gic_chip_data { 51 struct fwnode_handle *fwnode; 52 void __iomem *dist_base; 53 struct redist_region *redist_regions; 54 struct rdists rdists; 55 struct irq_domain *domain; 56 u64 redist_stride; 57 u32 nr_redist_regions; 58 bool has_rss; 59 unsigned int irq_nr; 60 struct partition_desc *ppi_descs[16]; 61 }; 62 63 static struct gic_chip_data gic_data __read_mostly; 64 static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key); 65 66 static struct gic_kvm_info gic_v3_kvm_info; 67 static DEFINE_PER_CPU(bool, has_rss); 68 69 #define MPIDR_RS(mpidr) (((mpidr) & 0xF0UL) >> 4) 70 #define gic_data_rdist() (this_cpu_ptr(gic_data.rdists.rdist)) 71 #define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base) 72 #define gic_data_rdist_sgi_base() (gic_data_rdist_rd_base() + SZ_64K) 73 74 /* Our default, arbitrary priority value. Linux only uses one anyway. */ 75 #define DEFAULT_PMR_VALUE 0xf0 76 77 static inline unsigned int gic_irq(struct irq_data *d) 78 { 79 return d->hwirq; 80 } 81 82 static inline int gic_irq_in_rdist(struct irq_data *d) 83 { 84 return gic_irq(d) < 32; 85 } 86 87 static inline void __iomem *gic_dist_base(struct irq_data *d) 88 { 89 if (gic_irq_in_rdist(d)) /* SGI+PPI -> SGI_base for this CPU */ 90 return gic_data_rdist_sgi_base(); 91 92 if (d->hwirq <= 1023) /* SPI -> dist_base */ 93 return gic_data.dist_base; 94 95 return NULL; 96 } 97 98 static void gic_do_wait_for_rwp(void __iomem *base) 99 { 100 u32 count = 1000000; /* 1s! */ 101 102 while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) { 103 count--; 104 if (!count) { 105 pr_err_ratelimited("RWP timeout, gone fishing\n"); 106 return; 107 } 108 cpu_relax(); 109 udelay(1); 110 }; 111 } 112 113 /* Wait for completion of a distributor change */ 114 static void gic_dist_wait_for_rwp(void) 115 { 116 gic_do_wait_for_rwp(gic_data.dist_base); 117 } 118 119 /* Wait for completion of a redistributor change */ 120 static void gic_redist_wait_for_rwp(void) 121 { 122 gic_do_wait_for_rwp(gic_data_rdist_rd_base()); 123 } 124 125 #ifdef CONFIG_ARM64 126 127 static u64 __maybe_unused gic_read_iar(void) 128 { 129 if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_23154)) 130 return gic_read_iar_cavium_thunderx(); 131 else 132 return gic_read_iar_common(); 133 } 134 #endif 135 136 static void gic_enable_redist(bool enable) 137 { 138 void __iomem *rbase; 139 u32 count = 1000000; /* 1s! */ 140 u32 val; 141 142 rbase = gic_data_rdist_rd_base(); 143 144 val = readl_relaxed(rbase + GICR_WAKER); 145 if (enable) 146 /* Wake up this CPU redistributor */ 147 val &= ~GICR_WAKER_ProcessorSleep; 148 else 149 val |= GICR_WAKER_ProcessorSleep; 150 writel_relaxed(val, rbase + GICR_WAKER); 151 152 if (!enable) { /* Check that GICR_WAKER is writeable */ 153 val = readl_relaxed(rbase + GICR_WAKER); 154 if (!(val & GICR_WAKER_ProcessorSleep)) 155 return; /* No PM support in this redistributor */ 156 } 157 158 while (--count) { 159 val = readl_relaxed(rbase + GICR_WAKER); 160 if (enable ^ (bool)(val & GICR_WAKER_ChildrenAsleep)) 161 break; 162 cpu_relax(); 163 udelay(1); 164 }; 165 if (!count) 166 pr_err_ratelimited("redistributor failed to %s...\n", 167 enable ? "wakeup" : "sleep"); 168 } 169 170 /* 171 * Routines to disable, enable, EOI and route interrupts 172 */ 173 static int gic_peek_irq(struct irq_data *d, u32 offset) 174 { 175 u32 mask = 1 << (gic_irq(d) % 32); 176 void __iomem *base; 177 178 if (gic_irq_in_rdist(d)) 179 base = gic_data_rdist_sgi_base(); 180 else 181 base = gic_data.dist_base; 182 183 return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask); 184 } 185 186 static void gic_poke_irq(struct irq_data *d, u32 offset) 187 { 188 u32 mask = 1 << (gic_irq(d) % 32); 189 void (*rwp_wait)(void); 190 void __iomem *base; 191 192 if (gic_irq_in_rdist(d)) { 193 base = gic_data_rdist_sgi_base(); 194 rwp_wait = gic_redist_wait_for_rwp; 195 } else { 196 base = gic_data.dist_base; 197 rwp_wait = gic_dist_wait_for_rwp; 198 } 199 200 writel_relaxed(mask, base + offset + (gic_irq(d) / 32) * 4); 201 rwp_wait(); 202 } 203 204 static void gic_mask_irq(struct irq_data *d) 205 { 206 gic_poke_irq(d, GICD_ICENABLER); 207 } 208 209 static void gic_eoimode1_mask_irq(struct irq_data *d) 210 { 211 gic_mask_irq(d); 212 /* 213 * When masking a forwarded interrupt, make sure it is 214 * deactivated as well. 215 * 216 * This ensures that an interrupt that is getting 217 * disabled/masked will not get "stuck", because there is 218 * noone to deactivate it (guest is being terminated). 219 */ 220 if (irqd_is_forwarded_to_vcpu(d)) 221 gic_poke_irq(d, GICD_ICACTIVER); 222 } 223 224 static void gic_unmask_irq(struct irq_data *d) 225 { 226 gic_poke_irq(d, GICD_ISENABLER); 227 } 228 229 static int gic_irq_set_irqchip_state(struct irq_data *d, 230 enum irqchip_irq_state which, bool val) 231 { 232 u32 reg; 233 234 if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */ 235 return -EINVAL; 236 237 switch (which) { 238 case IRQCHIP_STATE_PENDING: 239 reg = val ? GICD_ISPENDR : GICD_ICPENDR; 240 break; 241 242 case IRQCHIP_STATE_ACTIVE: 243 reg = val ? GICD_ISACTIVER : GICD_ICACTIVER; 244 break; 245 246 case IRQCHIP_STATE_MASKED: 247 reg = val ? GICD_ICENABLER : GICD_ISENABLER; 248 break; 249 250 default: 251 return -EINVAL; 252 } 253 254 gic_poke_irq(d, reg); 255 return 0; 256 } 257 258 static int gic_irq_get_irqchip_state(struct irq_data *d, 259 enum irqchip_irq_state which, bool *val) 260 { 261 if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */ 262 return -EINVAL; 263 264 switch (which) { 265 case IRQCHIP_STATE_PENDING: 266 *val = gic_peek_irq(d, GICD_ISPENDR); 267 break; 268 269 case IRQCHIP_STATE_ACTIVE: 270 *val = gic_peek_irq(d, GICD_ISACTIVER); 271 break; 272 273 case IRQCHIP_STATE_MASKED: 274 *val = !gic_peek_irq(d, GICD_ISENABLER); 275 break; 276 277 default: 278 return -EINVAL; 279 } 280 281 return 0; 282 } 283 284 static void gic_eoi_irq(struct irq_data *d) 285 { 286 gic_write_eoir(gic_irq(d)); 287 } 288 289 static void gic_eoimode1_eoi_irq(struct irq_data *d) 290 { 291 /* 292 * No need to deactivate an LPI, or an interrupt that 293 * is is getting forwarded to a vcpu. 294 */ 295 if (gic_irq(d) >= 8192 || irqd_is_forwarded_to_vcpu(d)) 296 return; 297 gic_write_dir(gic_irq(d)); 298 } 299 300 static int gic_set_type(struct irq_data *d, unsigned int type) 301 { 302 unsigned int irq = gic_irq(d); 303 void (*rwp_wait)(void); 304 void __iomem *base; 305 306 /* Interrupt configuration for SGIs can't be changed */ 307 if (irq < 16) 308 return -EINVAL; 309 310 /* SPIs have restrictions on the supported types */ 311 if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH && 312 type != IRQ_TYPE_EDGE_RISING) 313 return -EINVAL; 314 315 if (gic_irq_in_rdist(d)) { 316 base = gic_data_rdist_sgi_base(); 317 rwp_wait = gic_redist_wait_for_rwp; 318 } else { 319 base = gic_data.dist_base; 320 rwp_wait = gic_dist_wait_for_rwp; 321 } 322 323 return gic_configure_irq(irq, type, base, rwp_wait); 324 } 325 326 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu) 327 { 328 if (vcpu) 329 irqd_set_forwarded_to_vcpu(d); 330 else 331 irqd_clr_forwarded_to_vcpu(d); 332 return 0; 333 } 334 335 static u64 gic_mpidr_to_affinity(unsigned long mpidr) 336 { 337 u64 aff; 338 339 aff = ((u64)MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 | 340 MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 | 341 MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 | 342 MPIDR_AFFINITY_LEVEL(mpidr, 0)); 343 344 return aff; 345 } 346 347 static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) 348 { 349 u32 irqnr; 350 351 do { 352 irqnr = gic_read_iar(); 353 354 if (likely(irqnr > 15 && irqnr < 1020) || irqnr >= 8192) { 355 int err; 356 357 if (static_branch_likely(&supports_deactivate_key)) 358 gic_write_eoir(irqnr); 359 else 360 isb(); 361 362 err = handle_domain_irq(gic_data.domain, irqnr, regs); 363 if (err) { 364 WARN_ONCE(true, "Unexpected interrupt received!\n"); 365 if (static_branch_likely(&supports_deactivate_key)) { 366 if (irqnr < 8192) 367 gic_write_dir(irqnr); 368 } else { 369 gic_write_eoir(irqnr); 370 } 371 } 372 continue; 373 } 374 if (irqnr < 16) { 375 gic_write_eoir(irqnr); 376 if (static_branch_likely(&supports_deactivate_key)) 377 gic_write_dir(irqnr); 378 #ifdef CONFIG_SMP 379 /* 380 * Unlike GICv2, we don't need an smp_rmb() here. 381 * The control dependency from gic_read_iar to 382 * the ISB in gic_write_eoir is enough to ensure 383 * that any shared data read by handle_IPI will 384 * be read after the ACK. 385 */ 386 handle_IPI(irqnr, regs); 387 #else 388 WARN_ONCE(true, "Unexpected SGI received!\n"); 389 #endif 390 continue; 391 } 392 } while (irqnr != ICC_IAR1_EL1_SPURIOUS); 393 } 394 395 static void __init gic_dist_init(void) 396 { 397 unsigned int i; 398 u64 affinity; 399 void __iomem *base = gic_data.dist_base; 400 401 /* Disable the distributor */ 402 writel_relaxed(0, base + GICD_CTLR); 403 gic_dist_wait_for_rwp(); 404 405 /* 406 * Configure SPIs as non-secure Group-1. This will only matter 407 * if the GIC only has a single security state. This will not 408 * do the right thing if the kernel is running in secure mode, 409 * but that's not the intended use case anyway. 410 */ 411 for (i = 32; i < gic_data.irq_nr; i += 32) 412 writel_relaxed(~0, base + GICD_IGROUPR + i / 8); 413 414 gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp); 415 416 /* Enable distributor with ARE, Group1 */ 417 writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1, 418 base + GICD_CTLR); 419 420 /* 421 * Set all global interrupts to the boot CPU only. ARE must be 422 * enabled. 423 */ 424 affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id())); 425 for (i = 32; i < gic_data.irq_nr; i++) 426 gic_write_irouter(affinity, base + GICD_IROUTER + i * 8); 427 } 428 429 static int gic_iterate_rdists(int (*fn)(struct redist_region *, void __iomem *)) 430 { 431 int ret = -ENODEV; 432 int i; 433 434 for (i = 0; i < gic_data.nr_redist_regions; i++) { 435 void __iomem *ptr = gic_data.redist_regions[i].redist_base; 436 u64 typer; 437 u32 reg; 438 439 reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK; 440 if (reg != GIC_PIDR2_ARCH_GICv3 && 441 reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */ 442 pr_warn("No redistributor present @%p\n", ptr); 443 break; 444 } 445 446 do { 447 typer = gic_read_typer(ptr + GICR_TYPER); 448 ret = fn(gic_data.redist_regions + i, ptr); 449 if (!ret) 450 return 0; 451 452 if (gic_data.redist_regions[i].single_redist) 453 break; 454 455 if (gic_data.redist_stride) { 456 ptr += gic_data.redist_stride; 457 } else { 458 ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */ 459 if (typer & GICR_TYPER_VLPIS) 460 ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */ 461 } 462 } while (!(typer & GICR_TYPER_LAST)); 463 } 464 465 return ret ? -ENODEV : 0; 466 } 467 468 static int __gic_populate_rdist(struct redist_region *region, void __iomem *ptr) 469 { 470 unsigned long mpidr = cpu_logical_map(smp_processor_id()); 471 u64 typer; 472 u32 aff; 473 474 /* 475 * Convert affinity to a 32bit value that can be matched to 476 * GICR_TYPER bits [63:32]. 477 */ 478 aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 | 479 MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 | 480 MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 | 481 MPIDR_AFFINITY_LEVEL(mpidr, 0)); 482 483 typer = gic_read_typer(ptr + GICR_TYPER); 484 if ((typer >> 32) == aff) { 485 u64 offset = ptr - region->redist_base; 486 gic_data_rdist_rd_base() = ptr; 487 gic_data_rdist()->phys_base = region->phys_base + offset; 488 489 pr_info("CPU%d: found redistributor %lx region %d:%pa\n", 490 smp_processor_id(), mpidr, 491 (int)(region - gic_data.redist_regions), 492 &gic_data_rdist()->phys_base); 493 return 0; 494 } 495 496 /* Try next one */ 497 return 1; 498 } 499 500 static int gic_populate_rdist(void) 501 { 502 if (gic_iterate_rdists(__gic_populate_rdist) == 0) 503 return 0; 504 505 /* We couldn't even deal with ourselves... */ 506 WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n", 507 smp_processor_id(), 508 (unsigned long)cpu_logical_map(smp_processor_id())); 509 return -ENODEV; 510 } 511 512 static int __gic_update_vlpi_properties(struct redist_region *region, 513 void __iomem *ptr) 514 { 515 u64 typer = gic_read_typer(ptr + GICR_TYPER); 516 gic_data.rdists.has_vlpis &= !!(typer & GICR_TYPER_VLPIS); 517 gic_data.rdists.has_direct_lpi &= !!(typer & GICR_TYPER_DirectLPIS); 518 519 return 1; 520 } 521 522 static void gic_update_vlpi_properties(void) 523 { 524 gic_iterate_rdists(__gic_update_vlpi_properties); 525 pr_info("%sVLPI support, %sdirect LPI support\n", 526 !gic_data.rdists.has_vlpis ? "no " : "", 527 !gic_data.rdists.has_direct_lpi ? "no " : ""); 528 } 529 530 static void gic_cpu_sys_reg_init(void) 531 { 532 int i, cpu = smp_processor_id(); 533 u64 mpidr = cpu_logical_map(cpu); 534 u64 need_rss = MPIDR_RS(mpidr); 535 bool group0; 536 u32 val, pribits; 537 538 /* 539 * Need to check that the SRE bit has actually been set. If 540 * not, it means that SRE is disabled at EL2. We're going to 541 * die painfully, and there is nothing we can do about it. 542 * 543 * Kindly inform the luser. 544 */ 545 if (!gic_enable_sre()) 546 pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n"); 547 548 pribits = gic_read_ctlr(); 549 pribits &= ICC_CTLR_EL1_PRI_BITS_MASK; 550 pribits >>= ICC_CTLR_EL1_PRI_BITS_SHIFT; 551 pribits++; 552 553 /* 554 * Let's find out if Group0 is under control of EL3 or not by 555 * setting the highest possible, non-zero priority in PMR. 556 * 557 * If SCR_EL3.FIQ is set, the priority gets shifted down in 558 * order for the CPU interface to set bit 7, and keep the 559 * actual priority in the non-secure range. In the process, it 560 * looses the least significant bit and the actual priority 561 * becomes 0x80. Reading it back returns 0, indicating that 562 * we're don't have access to Group0. 563 */ 564 write_gicreg(BIT(8 - pribits), ICC_PMR_EL1); 565 val = read_gicreg(ICC_PMR_EL1); 566 group0 = val != 0; 567 568 /* Set priority mask register */ 569 write_gicreg(DEFAULT_PMR_VALUE, ICC_PMR_EL1); 570 571 /* 572 * Some firmwares hand over to the kernel with the BPR changed from 573 * its reset value (and with a value large enough to prevent 574 * any pre-emptive interrupts from working at all). Writing a zero 575 * to BPR restores is reset value. 576 */ 577 gic_write_bpr1(0); 578 579 if (static_branch_likely(&supports_deactivate_key)) { 580 /* EOI drops priority only (mode 1) */ 581 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop); 582 } else { 583 /* EOI deactivates interrupt too (mode 0) */ 584 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir); 585 } 586 587 /* Always whack Group0 before Group1 */ 588 if (group0) { 589 switch(pribits) { 590 case 8: 591 case 7: 592 write_gicreg(0, ICC_AP0R3_EL1); 593 write_gicreg(0, ICC_AP0R2_EL1); 594 case 6: 595 write_gicreg(0, ICC_AP0R1_EL1); 596 case 5: 597 case 4: 598 write_gicreg(0, ICC_AP0R0_EL1); 599 } 600 601 isb(); 602 } 603 604 switch(pribits) { 605 case 8: 606 case 7: 607 write_gicreg(0, ICC_AP1R3_EL1); 608 write_gicreg(0, ICC_AP1R2_EL1); 609 case 6: 610 write_gicreg(0, ICC_AP1R1_EL1); 611 case 5: 612 case 4: 613 write_gicreg(0, ICC_AP1R0_EL1); 614 } 615 616 isb(); 617 618 /* ... and let's hit the road... */ 619 gic_write_grpen1(1); 620 621 /* Keep the RSS capability status in per_cpu variable */ 622 per_cpu(has_rss, cpu) = !!(gic_read_ctlr() & ICC_CTLR_EL1_RSS); 623 624 /* Check all the CPUs have capable of sending SGIs to other CPUs */ 625 for_each_online_cpu(i) { 626 bool have_rss = per_cpu(has_rss, i) && per_cpu(has_rss, cpu); 627 628 need_rss |= MPIDR_RS(cpu_logical_map(i)); 629 if (need_rss && (!have_rss)) 630 pr_crit("CPU%d (%lx) can't SGI CPU%d (%lx), no RSS\n", 631 cpu, (unsigned long)mpidr, 632 i, (unsigned long)cpu_logical_map(i)); 633 } 634 635 /** 636 * GIC spec says, when ICC_CTLR_EL1.RSS==1 and GICD_TYPER.RSS==0, 637 * writing ICC_ASGI1R_EL1 register with RS != 0 is a CONSTRAINED 638 * UNPREDICTABLE choice of : 639 * - The write is ignored. 640 * - The RS field is treated as 0. 641 */ 642 if (need_rss && (!gic_data.has_rss)) 643 pr_crit_once("RSS is required but GICD doesn't support it\n"); 644 } 645 646 static bool gicv3_nolpi; 647 648 static int __init gicv3_nolpi_cfg(char *buf) 649 { 650 return strtobool(buf, &gicv3_nolpi); 651 } 652 early_param("irqchip.gicv3_nolpi", gicv3_nolpi_cfg); 653 654 static int gic_dist_supports_lpis(void) 655 { 656 return !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS) && !gicv3_nolpi; 657 } 658 659 static void gic_cpu_init(void) 660 { 661 void __iomem *rbase; 662 663 /* Register ourselves with the rest of the world */ 664 if (gic_populate_rdist()) 665 return; 666 667 gic_enable_redist(true); 668 669 rbase = gic_data_rdist_sgi_base(); 670 671 /* Configure SGIs/PPIs as non-secure Group-1 */ 672 writel_relaxed(~0, rbase + GICR_IGROUPR0); 673 674 gic_cpu_config(rbase, gic_redist_wait_for_rwp); 675 676 /* Give LPIs a spin */ 677 if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis()) 678 its_cpu_init(); 679 680 /* initialise system registers */ 681 gic_cpu_sys_reg_init(); 682 } 683 684 #ifdef CONFIG_SMP 685 686 #define MPIDR_TO_SGI_RS(mpidr) (MPIDR_RS(mpidr) << ICC_SGI1R_RS_SHIFT) 687 #define MPIDR_TO_SGI_CLUSTER_ID(mpidr) ((mpidr) & ~0xFUL) 688 689 static int gic_starting_cpu(unsigned int cpu) 690 { 691 gic_cpu_init(); 692 return 0; 693 } 694 695 static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask, 696 unsigned long cluster_id) 697 { 698 int next_cpu, cpu = *base_cpu; 699 unsigned long mpidr = cpu_logical_map(cpu); 700 u16 tlist = 0; 701 702 while (cpu < nr_cpu_ids) { 703 tlist |= 1 << (mpidr & 0xf); 704 705 next_cpu = cpumask_next(cpu, mask); 706 if (next_cpu >= nr_cpu_ids) 707 goto out; 708 cpu = next_cpu; 709 710 mpidr = cpu_logical_map(cpu); 711 712 if (cluster_id != MPIDR_TO_SGI_CLUSTER_ID(mpidr)) { 713 cpu--; 714 goto out; 715 } 716 } 717 out: 718 *base_cpu = cpu; 719 return tlist; 720 } 721 722 #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \ 723 (MPIDR_AFFINITY_LEVEL(cluster_id, level) \ 724 << ICC_SGI1R_AFFINITY_## level ##_SHIFT) 725 726 static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq) 727 { 728 u64 val; 729 730 val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3) | 731 MPIDR_TO_SGI_AFFINITY(cluster_id, 2) | 732 irq << ICC_SGI1R_SGI_ID_SHIFT | 733 MPIDR_TO_SGI_AFFINITY(cluster_id, 1) | 734 MPIDR_TO_SGI_RS(cluster_id) | 735 tlist << ICC_SGI1R_TARGET_LIST_SHIFT); 736 737 pr_devel("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val); 738 gic_write_sgi1r(val); 739 } 740 741 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq) 742 { 743 int cpu; 744 745 if (WARN_ON(irq >= 16)) 746 return; 747 748 /* 749 * Ensure that stores to Normal memory are visible to the 750 * other CPUs before issuing the IPI. 751 */ 752 wmb(); 753 754 for_each_cpu(cpu, mask) { 755 u64 cluster_id = MPIDR_TO_SGI_CLUSTER_ID(cpu_logical_map(cpu)); 756 u16 tlist; 757 758 tlist = gic_compute_target_list(&cpu, mask, cluster_id); 759 gic_send_sgi(cluster_id, tlist, irq); 760 } 761 762 /* Force the above writes to ICC_SGI1R_EL1 to be executed */ 763 isb(); 764 } 765 766 static void gic_smp_init(void) 767 { 768 set_smp_cross_call(gic_raise_softirq); 769 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING, 770 "irqchip/arm/gicv3:starting", 771 gic_starting_cpu, NULL); 772 } 773 774 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, 775 bool force) 776 { 777 unsigned int cpu; 778 void __iomem *reg; 779 int enabled; 780 u64 val; 781 782 if (force) 783 cpu = cpumask_first(mask_val); 784 else 785 cpu = cpumask_any_and(mask_val, cpu_online_mask); 786 787 if (cpu >= nr_cpu_ids) 788 return -EINVAL; 789 790 if (gic_irq_in_rdist(d)) 791 return -EINVAL; 792 793 /* If interrupt was enabled, disable it first */ 794 enabled = gic_peek_irq(d, GICD_ISENABLER); 795 if (enabled) 796 gic_mask_irq(d); 797 798 reg = gic_dist_base(d) + GICD_IROUTER + (gic_irq(d) * 8); 799 val = gic_mpidr_to_affinity(cpu_logical_map(cpu)); 800 801 gic_write_irouter(val, reg); 802 803 /* 804 * If the interrupt was enabled, enabled it again. Otherwise, 805 * just wait for the distributor to have digested our changes. 806 */ 807 if (enabled) 808 gic_unmask_irq(d); 809 else 810 gic_dist_wait_for_rwp(); 811 812 irq_data_update_effective_affinity(d, cpumask_of(cpu)); 813 814 return IRQ_SET_MASK_OK_DONE; 815 } 816 #else 817 #define gic_set_affinity NULL 818 #define gic_smp_init() do { } while(0) 819 #endif 820 821 #ifdef CONFIG_CPU_PM 822 /* Check whether it's single security state view */ 823 static bool gic_dist_security_disabled(void) 824 { 825 return readl_relaxed(gic_data.dist_base + GICD_CTLR) & GICD_CTLR_DS; 826 } 827 828 static int gic_cpu_pm_notifier(struct notifier_block *self, 829 unsigned long cmd, void *v) 830 { 831 if (cmd == CPU_PM_EXIT) { 832 if (gic_dist_security_disabled()) 833 gic_enable_redist(true); 834 gic_cpu_sys_reg_init(); 835 } else if (cmd == CPU_PM_ENTER && gic_dist_security_disabled()) { 836 gic_write_grpen1(0); 837 gic_enable_redist(false); 838 } 839 return NOTIFY_OK; 840 } 841 842 static struct notifier_block gic_cpu_pm_notifier_block = { 843 .notifier_call = gic_cpu_pm_notifier, 844 }; 845 846 static void gic_cpu_pm_init(void) 847 { 848 cpu_pm_register_notifier(&gic_cpu_pm_notifier_block); 849 } 850 851 #else 852 static inline void gic_cpu_pm_init(void) { } 853 #endif /* CONFIG_CPU_PM */ 854 855 static struct irq_chip gic_chip = { 856 .name = "GICv3", 857 .irq_mask = gic_mask_irq, 858 .irq_unmask = gic_unmask_irq, 859 .irq_eoi = gic_eoi_irq, 860 .irq_set_type = gic_set_type, 861 .irq_set_affinity = gic_set_affinity, 862 .irq_get_irqchip_state = gic_irq_get_irqchip_state, 863 .irq_set_irqchip_state = gic_irq_set_irqchip_state, 864 .flags = IRQCHIP_SET_TYPE_MASKED, 865 }; 866 867 static struct irq_chip gic_eoimode1_chip = { 868 .name = "GICv3", 869 .irq_mask = gic_eoimode1_mask_irq, 870 .irq_unmask = gic_unmask_irq, 871 .irq_eoi = gic_eoimode1_eoi_irq, 872 .irq_set_type = gic_set_type, 873 .irq_set_affinity = gic_set_affinity, 874 .irq_get_irqchip_state = gic_irq_get_irqchip_state, 875 .irq_set_irqchip_state = gic_irq_set_irqchip_state, 876 .irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity, 877 .flags = IRQCHIP_SET_TYPE_MASKED, 878 }; 879 880 #define GIC_ID_NR (1U << gic_data.rdists.id_bits) 881 882 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq, 883 irq_hw_number_t hw) 884 { 885 struct irq_chip *chip = &gic_chip; 886 887 if (static_branch_likely(&supports_deactivate_key)) 888 chip = &gic_eoimode1_chip; 889 890 /* SGIs are private to the core kernel */ 891 if (hw < 16) 892 return -EPERM; 893 /* Nothing here */ 894 if (hw >= gic_data.irq_nr && hw < 8192) 895 return -EPERM; 896 /* Off limits */ 897 if (hw >= GIC_ID_NR) 898 return -EPERM; 899 900 /* PPIs */ 901 if (hw < 32) { 902 irq_set_percpu_devid(irq); 903 irq_domain_set_info(d, irq, hw, chip, d->host_data, 904 handle_percpu_devid_irq, NULL, NULL); 905 irq_set_status_flags(irq, IRQ_NOAUTOEN); 906 } 907 /* SPIs */ 908 if (hw >= 32 && hw < gic_data.irq_nr) { 909 irq_domain_set_info(d, irq, hw, chip, d->host_data, 910 handle_fasteoi_irq, NULL, NULL); 911 irq_set_probe(irq); 912 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq))); 913 } 914 /* LPIs */ 915 if (hw >= 8192 && hw < GIC_ID_NR) { 916 if (!gic_dist_supports_lpis()) 917 return -EPERM; 918 irq_domain_set_info(d, irq, hw, chip, d->host_data, 919 handle_fasteoi_irq, NULL, NULL); 920 } 921 922 return 0; 923 } 924 925 #define GIC_IRQ_TYPE_PARTITION (GIC_IRQ_TYPE_LPI + 1) 926 927 static int gic_irq_domain_translate(struct irq_domain *d, 928 struct irq_fwspec *fwspec, 929 unsigned long *hwirq, 930 unsigned int *type) 931 { 932 if (is_of_node(fwspec->fwnode)) { 933 if (fwspec->param_count < 3) 934 return -EINVAL; 935 936 switch (fwspec->param[0]) { 937 case 0: /* SPI */ 938 *hwirq = fwspec->param[1] + 32; 939 break; 940 case 1: /* PPI */ 941 case GIC_IRQ_TYPE_PARTITION: 942 *hwirq = fwspec->param[1] + 16; 943 break; 944 case GIC_IRQ_TYPE_LPI: /* LPI */ 945 *hwirq = fwspec->param[1]; 946 break; 947 default: 948 return -EINVAL; 949 } 950 951 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; 952 953 /* 954 * Make it clear that broken DTs are... broken. 955 * Partitionned PPIs are an unfortunate exception. 956 */ 957 WARN_ON(*type == IRQ_TYPE_NONE && 958 fwspec->param[0] != GIC_IRQ_TYPE_PARTITION); 959 return 0; 960 } 961 962 if (is_fwnode_irqchip(fwspec->fwnode)) { 963 if(fwspec->param_count != 2) 964 return -EINVAL; 965 966 *hwirq = fwspec->param[0]; 967 *type = fwspec->param[1]; 968 969 WARN_ON(*type == IRQ_TYPE_NONE); 970 return 0; 971 } 972 973 return -EINVAL; 974 } 975 976 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, 977 unsigned int nr_irqs, void *arg) 978 { 979 int i, ret; 980 irq_hw_number_t hwirq; 981 unsigned int type = IRQ_TYPE_NONE; 982 struct irq_fwspec *fwspec = arg; 983 984 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type); 985 if (ret) 986 return ret; 987 988 for (i = 0; i < nr_irqs; i++) { 989 ret = gic_irq_domain_map(domain, virq + i, hwirq + i); 990 if (ret) 991 return ret; 992 } 993 994 return 0; 995 } 996 997 static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq, 998 unsigned int nr_irqs) 999 { 1000 int i; 1001 1002 for (i = 0; i < nr_irqs; i++) { 1003 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i); 1004 irq_set_handler(virq + i, NULL); 1005 irq_domain_reset_irq_data(d); 1006 } 1007 } 1008 1009 static int gic_irq_domain_select(struct irq_domain *d, 1010 struct irq_fwspec *fwspec, 1011 enum irq_domain_bus_token bus_token) 1012 { 1013 /* Not for us */ 1014 if (fwspec->fwnode != d->fwnode) 1015 return 0; 1016 1017 /* If this is not DT, then we have a single domain */ 1018 if (!is_of_node(fwspec->fwnode)) 1019 return 1; 1020 1021 /* 1022 * If this is a PPI and we have a 4th (non-null) parameter, 1023 * then we need to match the partition domain. 1024 */ 1025 if (fwspec->param_count >= 4 && 1026 fwspec->param[0] == 1 && fwspec->param[3] != 0) 1027 return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]); 1028 1029 return d == gic_data.domain; 1030 } 1031 1032 static const struct irq_domain_ops gic_irq_domain_ops = { 1033 .translate = gic_irq_domain_translate, 1034 .alloc = gic_irq_domain_alloc, 1035 .free = gic_irq_domain_free, 1036 .select = gic_irq_domain_select, 1037 }; 1038 1039 static int partition_domain_translate(struct irq_domain *d, 1040 struct irq_fwspec *fwspec, 1041 unsigned long *hwirq, 1042 unsigned int *type) 1043 { 1044 struct device_node *np; 1045 int ret; 1046 1047 np = of_find_node_by_phandle(fwspec->param[3]); 1048 if (WARN_ON(!np)) 1049 return -EINVAL; 1050 1051 ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]], 1052 of_node_to_fwnode(np)); 1053 if (ret < 0) 1054 return ret; 1055 1056 *hwirq = ret; 1057 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; 1058 1059 return 0; 1060 } 1061 1062 static const struct irq_domain_ops partition_domain_ops = { 1063 .translate = partition_domain_translate, 1064 .select = gic_irq_domain_select, 1065 }; 1066 1067 static int __init gic_init_bases(void __iomem *dist_base, 1068 struct redist_region *rdist_regs, 1069 u32 nr_redist_regions, 1070 u64 redist_stride, 1071 struct fwnode_handle *handle) 1072 { 1073 u32 typer; 1074 int gic_irqs; 1075 int err; 1076 1077 if (!is_hyp_mode_available()) 1078 static_branch_disable(&supports_deactivate_key); 1079 1080 if (static_branch_likely(&supports_deactivate_key)) 1081 pr_info("GIC: Using split EOI/Deactivate mode\n"); 1082 1083 gic_data.fwnode = handle; 1084 gic_data.dist_base = dist_base; 1085 gic_data.redist_regions = rdist_regs; 1086 gic_data.nr_redist_regions = nr_redist_regions; 1087 gic_data.redist_stride = redist_stride; 1088 1089 /* 1090 * Find out how many interrupts are supported. 1091 * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI) 1092 */ 1093 typer = readl_relaxed(gic_data.dist_base + GICD_TYPER); 1094 gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer); 1095 gic_irqs = GICD_TYPER_IRQS(typer); 1096 if (gic_irqs > 1020) 1097 gic_irqs = 1020; 1098 gic_data.irq_nr = gic_irqs; 1099 1100 gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops, 1101 &gic_data); 1102 irq_domain_update_bus_token(gic_data.domain, DOMAIN_BUS_WIRED); 1103 gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist)); 1104 gic_data.rdists.has_vlpis = true; 1105 gic_data.rdists.has_direct_lpi = true; 1106 1107 if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) { 1108 err = -ENOMEM; 1109 goto out_free; 1110 } 1111 1112 gic_data.has_rss = !!(typer & GICD_TYPER_RSS); 1113 pr_info("Distributor has %sRange Selector support\n", 1114 gic_data.has_rss ? "" : "no "); 1115 1116 if (typer & GICD_TYPER_MBIS) { 1117 err = mbi_init(handle, gic_data.domain); 1118 if (err) 1119 pr_err("Failed to initialize MBIs\n"); 1120 } 1121 1122 set_handle_irq(gic_handle_irq); 1123 1124 gic_update_vlpi_properties(); 1125 1126 if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis()) 1127 its_init(handle, &gic_data.rdists, gic_data.domain); 1128 1129 gic_smp_init(); 1130 gic_dist_init(); 1131 gic_cpu_init(); 1132 gic_cpu_pm_init(); 1133 1134 return 0; 1135 1136 out_free: 1137 if (gic_data.domain) 1138 irq_domain_remove(gic_data.domain); 1139 free_percpu(gic_data.rdists.rdist); 1140 return err; 1141 } 1142 1143 static int __init gic_validate_dist_version(void __iomem *dist_base) 1144 { 1145 u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK; 1146 1147 if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4) 1148 return -ENODEV; 1149 1150 return 0; 1151 } 1152 1153 /* Create all possible partitions at boot time */ 1154 static void __init gic_populate_ppi_partitions(struct device_node *gic_node) 1155 { 1156 struct device_node *parts_node, *child_part; 1157 int part_idx = 0, i; 1158 int nr_parts; 1159 struct partition_affinity *parts; 1160 1161 parts_node = of_get_child_by_name(gic_node, "ppi-partitions"); 1162 if (!parts_node) 1163 return; 1164 1165 nr_parts = of_get_child_count(parts_node); 1166 1167 if (!nr_parts) 1168 goto out_put_node; 1169 1170 parts = kcalloc(nr_parts, sizeof(*parts), GFP_KERNEL); 1171 if (WARN_ON(!parts)) 1172 goto out_put_node; 1173 1174 for_each_child_of_node(parts_node, child_part) { 1175 struct partition_affinity *part; 1176 int n; 1177 1178 part = &parts[part_idx]; 1179 1180 part->partition_id = of_node_to_fwnode(child_part); 1181 1182 pr_info("GIC: PPI partition %s[%d] { ", 1183 child_part->name, part_idx); 1184 1185 n = of_property_count_elems_of_size(child_part, "affinity", 1186 sizeof(u32)); 1187 WARN_ON(n <= 0); 1188 1189 for (i = 0; i < n; i++) { 1190 int err, cpu; 1191 u32 cpu_phandle; 1192 struct device_node *cpu_node; 1193 1194 err = of_property_read_u32_index(child_part, "affinity", 1195 i, &cpu_phandle); 1196 if (WARN_ON(err)) 1197 continue; 1198 1199 cpu_node = of_find_node_by_phandle(cpu_phandle); 1200 if (WARN_ON(!cpu_node)) 1201 continue; 1202 1203 cpu = of_cpu_node_to_id(cpu_node); 1204 if (WARN_ON(cpu < 0)) 1205 continue; 1206 1207 pr_cont("%pOF[%d] ", cpu_node, cpu); 1208 1209 cpumask_set_cpu(cpu, &part->mask); 1210 } 1211 1212 pr_cont("}\n"); 1213 part_idx++; 1214 } 1215 1216 for (i = 0; i < 16; i++) { 1217 unsigned int irq; 1218 struct partition_desc *desc; 1219 struct irq_fwspec ppi_fwspec = { 1220 .fwnode = gic_data.fwnode, 1221 .param_count = 3, 1222 .param = { 1223 [0] = GIC_IRQ_TYPE_PARTITION, 1224 [1] = i, 1225 [2] = IRQ_TYPE_NONE, 1226 }, 1227 }; 1228 1229 irq = irq_create_fwspec_mapping(&ppi_fwspec); 1230 if (WARN_ON(!irq)) 1231 continue; 1232 desc = partition_create_desc(gic_data.fwnode, parts, nr_parts, 1233 irq, &partition_domain_ops); 1234 if (WARN_ON(!desc)) 1235 continue; 1236 1237 gic_data.ppi_descs[i] = desc; 1238 } 1239 1240 out_put_node: 1241 of_node_put(parts_node); 1242 } 1243 1244 static void __init gic_of_setup_kvm_info(struct device_node *node) 1245 { 1246 int ret; 1247 struct resource r; 1248 u32 gicv_idx; 1249 1250 gic_v3_kvm_info.type = GIC_V3; 1251 1252 gic_v3_kvm_info.maint_irq = irq_of_parse_and_map(node, 0); 1253 if (!gic_v3_kvm_info.maint_irq) 1254 return; 1255 1256 if (of_property_read_u32(node, "#redistributor-regions", 1257 &gicv_idx)) 1258 gicv_idx = 1; 1259 1260 gicv_idx += 3; /* Also skip GICD, GICC, GICH */ 1261 ret = of_address_to_resource(node, gicv_idx, &r); 1262 if (!ret) 1263 gic_v3_kvm_info.vcpu = r; 1264 1265 gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis; 1266 gic_set_kvm_info(&gic_v3_kvm_info); 1267 } 1268 1269 static int __init gic_of_init(struct device_node *node, struct device_node *parent) 1270 { 1271 void __iomem *dist_base; 1272 struct redist_region *rdist_regs; 1273 u64 redist_stride; 1274 u32 nr_redist_regions; 1275 int err, i; 1276 1277 dist_base = of_iomap(node, 0); 1278 if (!dist_base) { 1279 pr_err("%pOF: unable to map gic dist registers\n", node); 1280 return -ENXIO; 1281 } 1282 1283 err = gic_validate_dist_version(dist_base); 1284 if (err) { 1285 pr_err("%pOF: no distributor detected, giving up\n", node); 1286 goto out_unmap_dist; 1287 } 1288 1289 if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions)) 1290 nr_redist_regions = 1; 1291 1292 rdist_regs = kcalloc(nr_redist_regions, sizeof(*rdist_regs), 1293 GFP_KERNEL); 1294 if (!rdist_regs) { 1295 err = -ENOMEM; 1296 goto out_unmap_dist; 1297 } 1298 1299 for (i = 0; i < nr_redist_regions; i++) { 1300 struct resource res; 1301 int ret; 1302 1303 ret = of_address_to_resource(node, 1 + i, &res); 1304 rdist_regs[i].redist_base = of_iomap(node, 1 + i); 1305 if (ret || !rdist_regs[i].redist_base) { 1306 pr_err("%pOF: couldn't map region %d\n", node, i); 1307 err = -ENODEV; 1308 goto out_unmap_rdist; 1309 } 1310 rdist_regs[i].phys_base = res.start; 1311 } 1312 1313 if (of_property_read_u64(node, "redistributor-stride", &redist_stride)) 1314 redist_stride = 0; 1315 1316 err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions, 1317 redist_stride, &node->fwnode); 1318 if (err) 1319 goto out_unmap_rdist; 1320 1321 gic_populate_ppi_partitions(node); 1322 1323 if (static_branch_likely(&supports_deactivate_key)) 1324 gic_of_setup_kvm_info(node); 1325 return 0; 1326 1327 out_unmap_rdist: 1328 for (i = 0; i < nr_redist_regions; i++) 1329 if (rdist_regs[i].redist_base) 1330 iounmap(rdist_regs[i].redist_base); 1331 kfree(rdist_regs); 1332 out_unmap_dist: 1333 iounmap(dist_base); 1334 return err; 1335 } 1336 1337 IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init); 1338 1339 #ifdef CONFIG_ACPI 1340 static struct 1341 { 1342 void __iomem *dist_base; 1343 struct redist_region *redist_regs; 1344 u32 nr_redist_regions; 1345 bool single_redist; 1346 u32 maint_irq; 1347 int maint_irq_mode; 1348 phys_addr_t vcpu_base; 1349 } acpi_data __initdata; 1350 1351 static void __init 1352 gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base) 1353 { 1354 static int count = 0; 1355 1356 acpi_data.redist_regs[count].phys_base = phys_base; 1357 acpi_data.redist_regs[count].redist_base = redist_base; 1358 acpi_data.redist_regs[count].single_redist = acpi_data.single_redist; 1359 count++; 1360 } 1361 1362 static int __init 1363 gic_acpi_parse_madt_redist(struct acpi_subtable_header *header, 1364 const unsigned long end) 1365 { 1366 struct acpi_madt_generic_redistributor *redist = 1367 (struct acpi_madt_generic_redistributor *)header; 1368 void __iomem *redist_base; 1369 1370 redist_base = ioremap(redist->base_address, redist->length); 1371 if (!redist_base) { 1372 pr_err("Couldn't map GICR region @%llx\n", redist->base_address); 1373 return -ENOMEM; 1374 } 1375 1376 gic_acpi_register_redist(redist->base_address, redist_base); 1377 return 0; 1378 } 1379 1380 static int __init 1381 gic_acpi_parse_madt_gicc(struct acpi_subtable_header *header, 1382 const unsigned long end) 1383 { 1384 struct acpi_madt_generic_interrupt *gicc = 1385 (struct acpi_madt_generic_interrupt *)header; 1386 u32 reg = readl_relaxed(acpi_data.dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK; 1387 u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2; 1388 void __iomem *redist_base; 1389 1390 /* GICC entry which has !ACPI_MADT_ENABLED is not unusable so skip */ 1391 if (!(gicc->flags & ACPI_MADT_ENABLED)) 1392 return 0; 1393 1394 redist_base = ioremap(gicc->gicr_base_address, size); 1395 if (!redist_base) 1396 return -ENOMEM; 1397 1398 gic_acpi_register_redist(gicc->gicr_base_address, redist_base); 1399 return 0; 1400 } 1401 1402 static int __init gic_acpi_collect_gicr_base(void) 1403 { 1404 acpi_tbl_entry_handler redist_parser; 1405 enum acpi_madt_type type; 1406 1407 if (acpi_data.single_redist) { 1408 type = ACPI_MADT_TYPE_GENERIC_INTERRUPT; 1409 redist_parser = gic_acpi_parse_madt_gicc; 1410 } else { 1411 type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR; 1412 redist_parser = gic_acpi_parse_madt_redist; 1413 } 1414 1415 /* Collect redistributor base addresses in GICR entries */ 1416 if (acpi_table_parse_madt(type, redist_parser, 0) > 0) 1417 return 0; 1418 1419 pr_info("No valid GICR entries exist\n"); 1420 return -ENODEV; 1421 } 1422 1423 static int __init gic_acpi_match_gicr(struct acpi_subtable_header *header, 1424 const unsigned long end) 1425 { 1426 /* Subtable presence means that redist exists, that's it */ 1427 return 0; 1428 } 1429 1430 static int __init gic_acpi_match_gicc(struct acpi_subtable_header *header, 1431 const unsigned long end) 1432 { 1433 struct acpi_madt_generic_interrupt *gicc = 1434 (struct acpi_madt_generic_interrupt *)header; 1435 1436 /* 1437 * If GICC is enabled and has valid gicr base address, then it means 1438 * GICR base is presented via GICC 1439 */ 1440 if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) 1441 return 0; 1442 1443 /* 1444 * It's perfectly valid firmware can pass disabled GICC entry, driver 1445 * should not treat as errors, skip the entry instead of probe fail. 1446 */ 1447 if (!(gicc->flags & ACPI_MADT_ENABLED)) 1448 return 0; 1449 1450 return -ENODEV; 1451 } 1452 1453 static int __init gic_acpi_count_gicr_regions(void) 1454 { 1455 int count; 1456 1457 /* 1458 * Count how many redistributor regions we have. It is not allowed 1459 * to mix redistributor description, GICR and GICC subtables have to be 1460 * mutually exclusive. 1461 */ 1462 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR, 1463 gic_acpi_match_gicr, 0); 1464 if (count > 0) { 1465 acpi_data.single_redist = false; 1466 return count; 1467 } 1468 1469 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, 1470 gic_acpi_match_gicc, 0); 1471 if (count > 0) 1472 acpi_data.single_redist = true; 1473 1474 return count; 1475 } 1476 1477 static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header, 1478 struct acpi_probe_entry *ape) 1479 { 1480 struct acpi_madt_generic_distributor *dist; 1481 int count; 1482 1483 dist = (struct acpi_madt_generic_distributor *)header; 1484 if (dist->version != ape->driver_data) 1485 return false; 1486 1487 /* We need to do that exercise anyway, the sooner the better */ 1488 count = gic_acpi_count_gicr_regions(); 1489 if (count <= 0) 1490 return false; 1491 1492 acpi_data.nr_redist_regions = count; 1493 return true; 1494 } 1495 1496 static int __init gic_acpi_parse_virt_madt_gicc(struct acpi_subtable_header *header, 1497 const unsigned long end) 1498 { 1499 struct acpi_madt_generic_interrupt *gicc = 1500 (struct acpi_madt_generic_interrupt *)header; 1501 int maint_irq_mode; 1502 static int first_madt = true; 1503 1504 /* Skip unusable CPUs */ 1505 if (!(gicc->flags & ACPI_MADT_ENABLED)) 1506 return 0; 1507 1508 maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ? 1509 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE; 1510 1511 if (first_madt) { 1512 first_madt = false; 1513 1514 acpi_data.maint_irq = gicc->vgic_interrupt; 1515 acpi_data.maint_irq_mode = maint_irq_mode; 1516 acpi_data.vcpu_base = gicc->gicv_base_address; 1517 1518 return 0; 1519 } 1520 1521 /* 1522 * The maintenance interrupt and GICV should be the same for every CPU 1523 */ 1524 if ((acpi_data.maint_irq != gicc->vgic_interrupt) || 1525 (acpi_data.maint_irq_mode != maint_irq_mode) || 1526 (acpi_data.vcpu_base != gicc->gicv_base_address)) 1527 return -EINVAL; 1528 1529 return 0; 1530 } 1531 1532 static bool __init gic_acpi_collect_virt_info(void) 1533 { 1534 int count; 1535 1536 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT, 1537 gic_acpi_parse_virt_madt_gicc, 0); 1538 1539 return (count > 0); 1540 } 1541 1542 #define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K) 1543 #define ACPI_GICV2_VCTRL_MEM_SIZE (SZ_4K) 1544 #define ACPI_GICV2_VCPU_MEM_SIZE (SZ_8K) 1545 1546 static void __init gic_acpi_setup_kvm_info(void) 1547 { 1548 int irq; 1549 1550 if (!gic_acpi_collect_virt_info()) { 1551 pr_warn("Unable to get hardware information used for virtualization\n"); 1552 return; 1553 } 1554 1555 gic_v3_kvm_info.type = GIC_V3; 1556 1557 irq = acpi_register_gsi(NULL, acpi_data.maint_irq, 1558 acpi_data.maint_irq_mode, 1559 ACPI_ACTIVE_HIGH); 1560 if (irq <= 0) 1561 return; 1562 1563 gic_v3_kvm_info.maint_irq = irq; 1564 1565 if (acpi_data.vcpu_base) { 1566 struct resource *vcpu = &gic_v3_kvm_info.vcpu; 1567 1568 vcpu->flags = IORESOURCE_MEM; 1569 vcpu->start = acpi_data.vcpu_base; 1570 vcpu->end = vcpu->start + ACPI_GICV2_VCPU_MEM_SIZE - 1; 1571 } 1572 1573 gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis; 1574 gic_set_kvm_info(&gic_v3_kvm_info); 1575 } 1576 1577 static int __init 1578 gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end) 1579 { 1580 struct acpi_madt_generic_distributor *dist; 1581 struct fwnode_handle *domain_handle; 1582 size_t size; 1583 int i, err; 1584 1585 /* Get distributor base address */ 1586 dist = (struct acpi_madt_generic_distributor *)header; 1587 acpi_data.dist_base = ioremap(dist->base_address, 1588 ACPI_GICV3_DIST_MEM_SIZE); 1589 if (!acpi_data.dist_base) { 1590 pr_err("Unable to map GICD registers\n"); 1591 return -ENOMEM; 1592 } 1593 1594 err = gic_validate_dist_version(acpi_data.dist_base); 1595 if (err) { 1596 pr_err("No distributor detected at @%p, giving up\n", 1597 acpi_data.dist_base); 1598 goto out_dist_unmap; 1599 } 1600 1601 size = sizeof(*acpi_data.redist_regs) * acpi_data.nr_redist_regions; 1602 acpi_data.redist_regs = kzalloc(size, GFP_KERNEL); 1603 if (!acpi_data.redist_regs) { 1604 err = -ENOMEM; 1605 goto out_dist_unmap; 1606 } 1607 1608 err = gic_acpi_collect_gicr_base(); 1609 if (err) 1610 goto out_redist_unmap; 1611 1612 domain_handle = irq_domain_alloc_fwnode(acpi_data.dist_base); 1613 if (!domain_handle) { 1614 err = -ENOMEM; 1615 goto out_redist_unmap; 1616 } 1617 1618 err = gic_init_bases(acpi_data.dist_base, acpi_data.redist_regs, 1619 acpi_data.nr_redist_regions, 0, domain_handle); 1620 if (err) 1621 goto out_fwhandle_free; 1622 1623 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle); 1624 1625 if (static_branch_likely(&supports_deactivate_key)) 1626 gic_acpi_setup_kvm_info(); 1627 1628 return 0; 1629 1630 out_fwhandle_free: 1631 irq_domain_free_fwnode(domain_handle); 1632 out_redist_unmap: 1633 for (i = 0; i < acpi_data.nr_redist_regions; i++) 1634 if (acpi_data.redist_regs[i].redist_base) 1635 iounmap(acpi_data.redist_regs[i].redist_base); 1636 kfree(acpi_data.redist_regs); 1637 out_dist_unmap: 1638 iounmap(acpi_data.dist_base); 1639 return err; 1640 } 1641 IRQCHIP_ACPI_DECLARE(gic_v3, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 1642 acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V3, 1643 gic_acpi_init); 1644 IRQCHIP_ACPI_DECLARE(gic_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 1645 acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V4, 1646 gic_acpi_init); 1647 IRQCHIP_ACPI_DECLARE(gic_v3_or_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR, 1648 acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_NONE, 1649 gic_acpi_init); 1650 #endif 1651