drivers/irqchip/irq-gic-v3.c

   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                                   IRQCHIP_SKIP_SET_WAKE |
 866                                   IRQCHIP_MASK_ON_SUSPEND,
 867 };
 868
 869 static struct irq_chip gic_eoimode1_chip = {
 870         .name                   = "GICv3",
 871         .irq_mask               = gic_eoimode1_mask_irq,
 872         .irq_unmask             = gic_unmask_irq,
 873         .irq_eoi                = gic_eoimode1_eoi_irq,
 874         .irq_set_type           = gic_set_type,
 875         .irq_set_affinity       = gic_set_affinity,
 876         .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
 877         .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 878         .irq_set_vcpu_affinity  = gic_irq_set_vcpu_affinity,
 879         .flags                  = IRQCHIP_SET_TYPE_MASKED |
 880                                   IRQCHIP_SKIP_SET_WAKE |
 881                                   IRQCHIP_MASK_ON_SUSPEND,
 882 };
 883
 884 #define GIC_ID_NR       (1U << GICD_TYPER_ID_BITS(gic_data.rdists.gicd_typer))
 885
 886 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
 887                               irq_hw_number_t hw)
 888 {
 889         struct irq_chip *chip = &gic_chip;
 890
 891         if (static_branch_likely(&supports_deactivate_key))
 892                 chip = &gic_eoimode1_chip;
 893
 894         /* SGIs are private to the core kernel */
 895         if (hw < 16)
 896                 return -EPERM;
 897         /* Nothing here */
 898         if (hw >= gic_data.irq_nr && hw < 8192)
 899                 return -EPERM;
 900         /* Off limits */
 901         if (hw >= GIC_ID_NR)
 902                 return -EPERM;
 903
 904         /* PPIs */
 905         if (hw < 32) {
 906                 irq_set_percpu_devid(irq);
 907                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 908                                     handle_percpu_devid_irq, NULL, NULL);
 909                 irq_set_status_flags(irq, IRQ_NOAUTOEN);
 910         }
 911         /* SPIs */
 912         if (hw >= 32 && hw < gic_data.irq_nr) {
 913                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 914                                     handle_fasteoi_irq, NULL, NULL);
 915                 irq_set_probe(irq);
 916                 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
 917         }
 918         /* LPIs */
 919         if (hw >= 8192 && hw < GIC_ID_NR) {
 920                 if (!gic_dist_supports_lpis())
 921                         return -EPERM;
 922                 irq_domain_set_info(d, irq, hw, chip, d->host_data,
 923                                     handle_fasteoi_irq, NULL, NULL);
 924         }
 925
 926         return 0;
 927 }
 928
 929 #define GIC_IRQ_TYPE_PARTITION  (GIC_IRQ_TYPE_LPI + 1)
 930
 931 static int gic_irq_domain_translate(struct irq_domain *d,
 932                                     struct irq_fwspec *fwspec,
 933                                     unsigned long *hwirq,
 934                                     unsigned int *type)
 935 {
 936         if (is_of_node(fwspec->fwnode)) {
 937                 if (fwspec->param_count < 3)
 938                         return -EINVAL;
 939
 940                 switch (fwspec->param[0]) {
 941                 case 0:                 /* SPI */
 942                         *hwirq = fwspec->param[1] + 32;
 943                         break;
 944                 case 1:                 /* PPI */
 945                 case GIC_IRQ_TYPE_PARTITION:
 946                         *hwirq = fwspec->param[1] + 16;
 947                         break;
 948                 case GIC_IRQ_TYPE_LPI:  /* LPI */
 949                         *hwirq = fwspec->param[1];
 950                         break;
 951                 default:
 952                         return -EINVAL;
 953                 }
 954
 955                 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
 956
 957                 /*
 958                  * Make it clear that broken DTs are... broken.
 959                  * Partitionned PPIs are an unfortunate exception.
 960                  */
 961                 WARN_ON(*type == IRQ_TYPE_NONE &&
 962                         fwspec->param[0] != GIC_IRQ_TYPE_PARTITION);
 963                 return 0;
 964         }
 965
 966         if (is_fwnode_irqchip(fwspec->fwnode)) {
 967                 if(fwspec->param_count != 2)
 968                         return -EINVAL;
 969
 970                 *hwirq = fwspec->param[0];
 971                 *type = fwspec->param[1];
 972
 973                 WARN_ON(*type == IRQ_TYPE_NONE);
 974                 return 0;
 975         }
 976
 977         return -EINVAL;
 978 }
 979
 980 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 981                                 unsigned int nr_irqs, void *arg)
 982 {
 983         int i, ret;
 984         irq_hw_number_t hwirq;
 985         unsigned int type = IRQ_TYPE_NONE;
 986         struct irq_fwspec *fwspec = arg;
 987
 988         ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
 989         if (ret)
 990                 return ret;
 991
 992         for (i = 0; i < nr_irqs; i++) {
 993                 ret = gic_irq_domain_map(domain, virq + i, hwirq + i);
 994                 if (ret)
 995                         return ret;
 996         }
 997
 998         return 0;
 999 }
1000
1001 static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
1002                                 unsigned int nr_irqs)
1003 {
1004         int i;
1005
1006         for (i = 0; i < nr_irqs; i++) {
1007                 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
1008                 irq_set_handler(virq + i, NULL);
1009                 irq_domain_reset_irq_data(d);
1010         }
1011 }
1012
1013 static int gic_irq_domain_select(struct irq_domain *d,
1014                                  struct irq_fwspec *fwspec,
1015                                  enum irq_domain_bus_token bus_token)
1016 {
1017         /* Not for us */
1018         if (fwspec->fwnode != d->fwnode)
1019                 return 0;
1020
1021         /* If this is not DT, then we have a single domain */
1022         if (!is_of_node(fwspec->fwnode))
1023                 return 1;
1024
1025         /*
1026          * If this is a PPI and we have a 4th (non-null) parameter,
1027          * then we need to match the partition domain.
1028          */
1029         if (fwspec->param_count >= 4 &&
1030             fwspec->param[0] == 1 && fwspec->param[3] != 0)
1031                 return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]);
1032
1033         return d == gic_data.domain;
1034 }
1035
1036 static const struct irq_domain_ops gic_irq_domain_ops = {
1037         .translate = gic_irq_domain_translate,
1038         .alloc = gic_irq_domain_alloc,
1039         .free = gic_irq_domain_free,
1040         .select = gic_irq_domain_select,
1041 };
1042
1043 static int partition_domain_translate(struct irq_domain *d,
1044                                       struct irq_fwspec *fwspec,
1045                                       unsigned long *hwirq,
1046                                       unsigned int *type)
1047 {
1048         struct device_node *np;
1049         int ret;
1050
1051         np = of_find_node_by_phandle(fwspec->param[3]);
1052         if (WARN_ON(!np))
1053                 return -EINVAL;
1054
1055         ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]],
1056                                      of_node_to_fwnode(np));
1057         if (ret < 0)
1058                 return ret;
1059
1060         *hwirq = ret;
1061         *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1062
1063         return 0;
1064 }
1065
1066 static const struct irq_domain_ops partition_domain_ops = {
1067         .translate = partition_domain_translate,
1068         .select = gic_irq_domain_select,
1069 };
1070
1071 static int __init gic_init_bases(void __iomem *dist_base,
1072                                  struct redist_region *rdist_regs,
1073                                  u32 nr_redist_regions,
1074                                  u64 redist_stride,
1075                                  struct fwnode_handle *handle)
1076 {
1077         u32 typer;
1078         int gic_irqs;
1079         int err;
1080
1081         if (!is_hyp_mode_available())
1082                 static_branch_disable(&supports_deactivate_key);
1083
1084         if (static_branch_likely(&supports_deactivate_key))
1085                 pr_info("GIC: Using split EOI/Deactivate mode\n");
1086
1087         gic_data.fwnode = handle;
1088         gic_data.dist_base = dist_base;
1089         gic_data.redist_regions = rdist_regs;
1090         gic_data.nr_redist_regions = nr_redist_regions;
1091         gic_data.redist_stride = redist_stride;
1092
1093         /*
1094          * Find out how many interrupts are supported.
1095          * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
1096          */
1097         typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
1098         gic_data.rdists.gicd_typer = typer;
1099         gic_irqs = GICD_TYPER_IRQS(typer);
1100         if (gic_irqs > 1020)
1101                 gic_irqs = 1020;
1102         gic_data.irq_nr = gic_irqs;
1103
1104         gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
1105                                                  &gic_data);
1106         irq_domain_update_bus_token(gic_data.domain, DOMAIN_BUS_WIRED);
1107         gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
1108         gic_data.rdists.has_vlpis = true;
1109         gic_data.rdists.has_direct_lpi = true;
1110
1111         if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
1112                 err = -ENOMEM;
1113                 goto out_free;
1114         }
1115
1116         gic_data.has_rss = !!(typer & GICD_TYPER_RSS);
1117         pr_info("Distributor has %sRange Selector support\n",
1118                 gic_data.has_rss ? "" : "no ");
1119
1120         if (typer & GICD_TYPER_MBIS) {
1121                 err = mbi_init(handle, gic_data.domain);
1122                 if (err)
1123                         pr_err("Failed to initialize MBIs\n");
1124         }
1125
1126         set_handle_irq(gic_handle_irq);
1127
1128         gic_update_vlpi_properties();
1129
1130         if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
1131                 its_init(handle, &gic_data.rdists, gic_data.domain);
1132
1133         gic_smp_init();
1134         gic_dist_init();
1135         gic_cpu_init();
1136         gic_cpu_pm_init();
1137
1138         return 0;
1139
1140 out_free:
1141         if (gic_data.domain)
1142                 irq_domain_remove(gic_data.domain);
1143         free_percpu(gic_data.rdists.rdist);
1144         return err;
1145 }
1146
1147 static int __init gic_validate_dist_version(void __iomem *dist_base)
1148 {
1149         u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1150
1151         if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4)
1152                 return -ENODEV;
1153
1154         return 0;
1155 }
1156
1157 /* Create all possible partitions at boot time */
1158 static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
1159 {
1160         struct device_node *parts_node, *child_part;
1161         int part_idx = 0, i;
1162         int nr_parts;
1163         struct partition_affinity *parts;
1164
1165         parts_node = of_get_child_by_name(gic_node, "ppi-partitions");
1166         if (!parts_node)
1167                 return;
1168
1169         nr_parts = of_get_child_count(parts_node);
1170
1171         if (!nr_parts)
1172                 goto out_put_node;
1173
1174         parts = kcalloc(nr_parts, sizeof(*parts), GFP_KERNEL);
1175         if (WARN_ON(!parts))
1176                 goto out_put_node;
1177
1178         for_each_child_of_node(parts_node, child_part) {
1179                 struct partition_affinity *part;
1180                 int n;
1181
1182                 part = &parts[part_idx];
1183
1184                 part->partition_id = of_node_to_fwnode(child_part);
1185
1186                 pr_info("GIC: PPI partition %s[%d] { ",
1187                         child_part->name, part_idx);
1188
1189                 n = of_property_count_elems_of_size(child_part, "affinity",
1190                                                     sizeof(u32));
1191                 WARN_ON(n <= 0);
1192
1193                 for (i = 0; i < n; i++) {
1194                         int err, cpu;
1195                         u32 cpu_phandle;
1196                         struct device_node *cpu_node;
1197
1198                         err = of_property_read_u32_index(child_part, "affinity",
1199                                                          i, &cpu_phandle);
1200                         if (WARN_ON(err))
1201                                 continue;
1202
1203                         cpu_node = of_find_node_by_phandle(cpu_phandle);
1204                         if (WARN_ON(!cpu_node))
1205                                 continue;
1206
1207                         cpu = of_cpu_node_to_id(cpu_node);
1208                         if (WARN_ON(cpu < 0))
1209                                 continue;
1210
1211                         pr_cont("%pOF[%d] ", cpu_node, cpu);
1212
1213                         cpumask_set_cpu(cpu, &part->mask);
1214                 }
1215
1216                 pr_cont("}\n");
1217                 part_idx++;
1218         }
1219
1220         for (i = 0; i < 16; i++) {
1221                 unsigned int irq;
1222                 struct partition_desc *desc;
1223                 struct irq_fwspec ppi_fwspec = {
1224                         .fwnode         = gic_data.fwnode,
1225                         .param_count    = 3,
1226                         .param          = {
1227                                 [0]     = GIC_IRQ_TYPE_PARTITION,
1228                                 [1]     = i,
1229                                 [2]     = IRQ_TYPE_NONE,
1230                         },
1231                 };
1232
1233                 irq = irq_create_fwspec_mapping(&ppi_fwspec);
1234                 if (WARN_ON(!irq))
1235                         continue;
1236                 desc = partition_create_desc(gic_data.fwnode, parts, nr_parts,
1237                                              irq, &partition_domain_ops);
1238                 if (WARN_ON(!desc))
1239                         continue;
1240
1241                 gic_data.ppi_descs[i] = desc;
1242         }
1243
1244 out_put_node:
1245         of_node_put(parts_node);
1246 }
1247
1248 static void __init gic_of_setup_kvm_info(struct device_node *node)
1249 {
1250         int ret;
1251         struct resource r;
1252         u32 gicv_idx;
1253
1254         gic_v3_kvm_info.type = GIC_V3;
1255
1256         gic_v3_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1257         if (!gic_v3_kvm_info.maint_irq)
1258                 return;
1259
1260         if (of_property_read_u32(node, "#redistributor-regions",
1261                                  &gicv_idx))
1262                 gicv_idx = 1;
1263
1264         gicv_idx += 3;  /* Also skip GICD, GICC, GICH */
1265         ret = of_address_to_resource(node, gicv_idx, &r);
1266         if (!ret)
1267                 gic_v3_kvm_info.vcpu = r;
1268
1269         gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
1270         gic_set_kvm_info(&gic_v3_kvm_info);
1271 }
1272
1273 static int __init gic_of_init(struct device_node *node, struct device_node *parent)
1274 {
1275         void __iomem *dist_base;
1276         struct redist_region *rdist_regs;
1277         u64 redist_stride;
1278         u32 nr_redist_regions;
1279         int err, i;
1280
1281         dist_base = of_iomap(node, 0);
1282         if (!dist_base) {
1283                 pr_err("%pOF: unable to map gic dist registers\n", node);
1284                 return -ENXIO;
1285         }
1286
1287         err = gic_validate_dist_version(dist_base);
1288         if (err) {
1289                 pr_err("%pOF: no distributor detected, giving up\n", node);
1290                 goto out_unmap_dist;
1291         }
1292
1293         if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
1294                 nr_redist_regions = 1;
1295
1296         rdist_regs = kcalloc(nr_redist_regions, sizeof(*rdist_regs),
1297                              GFP_KERNEL);
1298         if (!rdist_regs) {
1299                 err = -ENOMEM;
1300                 goto out_unmap_dist;
1301         }
1302
1303         for (i = 0; i < nr_redist_regions; i++) {
1304                 struct resource res;
1305                 int ret;
1306
1307                 ret = of_address_to_resource(node, 1 + i, &res);
1308                 rdist_regs[i].redist_base = of_iomap(node, 1 + i);
1309                 if (ret || !rdist_regs[i].redist_base) {
1310                         pr_err("%pOF: couldn't map region %d\n", node, i);
1311                         err = -ENODEV;
1312                         goto out_unmap_rdist;
1313                 }
1314                 rdist_regs[i].phys_base = res.start;
1315         }
1316
1317         if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
1318                 redist_stride = 0;
1319
1320         err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions,
1321                              redist_stride, &node->fwnode);
1322         if (err)
1323                 goto out_unmap_rdist;
1324
1325         gic_populate_ppi_partitions(node);
1326
1327         if (static_branch_likely(&supports_deactivate_key))
1328                 gic_of_setup_kvm_info(node);
1329         return 0;
1330
1331 out_unmap_rdist:
1332         for (i = 0; i < nr_redist_regions; i++)
1333                 if (rdist_regs[i].redist_base)
1334                         iounmap(rdist_regs[i].redist_base);
1335         kfree(rdist_regs);
1336 out_unmap_dist:
1337         iounmap(dist_base);
1338         return err;
1339 }
1340
1341 IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);
1342
1343 #ifdef CONFIG_ACPI
1344 static struct
1345 {
1346         void __iomem *dist_base;
1347         struct redist_region *redist_regs;
1348         u32 nr_redist_regions;
1349         bool single_redist;
1350         int enabled_rdists;
1351         u32 maint_irq;
1352         int maint_irq_mode;
1353         phys_addr_t vcpu_base;
1354 } acpi_data __initdata;
1355
1356 static void __init
1357 gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base)
1358 {
1359         static int count = 0;
1360
1361         acpi_data.redist_regs[count].phys_base = phys_base;
1362         acpi_data.redist_regs[count].redist_base = redist_base;
1363         acpi_data.redist_regs[count].single_redist = acpi_data.single_redist;
1364         count++;
1365 }
1366
1367 static int __init
1368 gic_acpi_parse_madt_redist(struct acpi_subtable_header *header,
1369                            const unsigned long end)
1370 {
1371         struct acpi_madt_generic_redistributor *redist =
1372                         (struct acpi_madt_generic_redistributor *)header;
1373         void __iomem *redist_base;
1374
1375         redist_base = ioremap(redist->base_address, redist->length);
1376         if (!redist_base) {
1377                 pr_err("Couldn't map GICR region @%llx\n", redist->base_address);
1378                 return -ENOMEM;
1379         }
1380
1381         gic_acpi_register_redist(redist->base_address, redist_base);
1382         return 0;
1383 }
1384
1385 static int __init
1386 gic_acpi_parse_madt_gicc(struct acpi_subtable_header *header,
1387                          const unsigned long end)
1388 {
1389         struct acpi_madt_generic_interrupt *gicc =
1390                                 (struct acpi_madt_generic_interrupt *)header;
1391         u32 reg = readl_relaxed(acpi_data.dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1392         u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2;
1393         void __iomem *redist_base;
1394
1395         /* GICC entry which has !ACPI_MADT_ENABLED is not unusable so skip */
1396         if (!(gicc->flags & ACPI_MADT_ENABLED))
1397                 return 0;
1398
1399         redist_base = ioremap(gicc->gicr_base_address, size);
1400         if (!redist_base)
1401                 return -ENOMEM;
1402
1403         gic_acpi_register_redist(gicc->gicr_base_address, redist_base);
1404         return 0;
1405 }
1406
1407 static int __init gic_acpi_collect_gicr_base(void)
1408 {
1409         acpi_tbl_entry_handler redist_parser;
1410         enum acpi_madt_type type;
1411
1412         if (acpi_data.single_redist) {
1413                 type = ACPI_MADT_TYPE_GENERIC_INTERRUPT;
1414                 redist_parser = gic_acpi_parse_madt_gicc;
1415         } else {
1416                 type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR;
1417                 redist_parser = gic_acpi_parse_madt_redist;
1418         }
1419
1420         /* Collect redistributor base addresses in GICR entries */
1421         if (acpi_table_parse_madt(type, redist_parser, 0) > 0)
1422                 return 0;
1423
1424         pr_info("No valid GICR entries exist\n");
1425         return -ENODEV;
1426 }
1427
1428 static int __init gic_acpi_match_gicr(struct acpi_subtable_header *header,
1429                                   const unsigned long end)
1430 {
1431         /* Subtable presence means that redist exists, that's it */
1432         return 0;
1433 }
1434
1435 static int __init gic_acpi_match_gicc(struct acpi_subtable_header *header,
1436                                       const unsigned long end)
1437 {
1438         struct acpi_madt_generic_interrupt *gicc =
1439                                 (struct acpi_madt_generic_interrupt *)header;
1440
1441         /*
1442          * If GICC is enabled and has valid gicr base address, then it means
1443          * GICR base is presented via GICC
1444          */
1445         if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) {
1446                 acpi_data.enabled_rdists++;
1447                 return 0;
1448         }
1449
1450         /*
1451          * It's perfectly valid firmware can pass disabled GICC entry, driver
1452          * should not treat as errors, skip the entry instead of probe fail.
1453          */
1454         if (!(gicc->flags & ACPI_MADT_ENABLED))
1455                 return 0;
1456
1457         return -ENODEV;
1458 }
1459
1460 static int __init gic_acpi_count_gicr_regions(void)
1461 {
1462         int count;
1463
1464         /*
1465          * Count how many redistributor regions we have. It is not allowed
1466          * to mix redistributor description, GICR and GICC subtables have to be
1467          * mutually exclusive.
1468          */
1469         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1470                                       gic_acpi_match_gicr, 0);
1471         if (count > 0) {
1472                 acpi_data.single_redist = false;
1473                 return count;
1474         }
1475
1476         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1477                                       gic_acpi_match_gicc, 0);
1478         if (count > 0) {
1479                 acpi_data.single_redist = true;
1480                 count = acpi_data.enabled_rdists;
1481         }
1482
1483         return count;
1484 }
1485
1486 static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header,
1487                                            struct acpi_probe_entry *ape)
1488 {
1489         struct acpi_madt_generic_distributor *dist;
1490         int count;
1491
1492         dist = (struct acpi_madt_generic_distributor *)header;
1493         if (dist->version != ape->driver_data)
1494                 return false;
1495
1496         /* We need to do that exercise anyway, the sooner the better */
1497         count = gic_acpi_count_gicr_regions();
1498         if (count <= 0)
1499                 return false;
1500
1501         acpi_data.nr_redist_regions = count;
1502         return true;
1503 }
1504
1505 static int __init gic_acpi_parse_virt_madt_gicc(struct acpi_subtable_header *header,
1506                                                 const unsigned long end)
1507 {
1508         struct acpi_madt_generic_interrupt *gicc =
1509                 (struct acpi_madt_generic_interrupt *)header;
1510         int maint_irq_mode;
1511         static int first_madt = true;
1512
1513         /* Skip unusable CPUs */
1514         if (!(gicc->flags & ACPI_MADT_ENABLED))
1515                 return 0;
1516
1517         maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
1518                 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
1519
1520         if (first_madt) {
1521                 first_madt = false;
1522
1523                 acpi_data.maint_irq = gicc->vgic_interrupt;
1524                 acpi_data.maint_irq_mode = maint_irq_mode;
1525                 acpi_data.vcpu_base = gicc->gicv_base_address;
1526
1527                 return 0;
1528         }
1529
1530         /*
1531          * The maintenance interrupt and GICV should be the same for every CPU
1532          */
1533         if ((acpi_data.maint_irq != gicc->vgic_interrupt) ||
1534             (acpi_data.maint_irq_mode != maint_irq_mode) ||
1535             (acpi_data.vcpu_base != gicc->gicv_base_address))
1536                 return -EINVAL;
1537
1538         return 0;
1539 }
1540
1541 static bool __init gic_acpi_collect_virt_info(void)
1542 {
1543         int count;
1544
1545         count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1546                                       gic_acpi_parse_virt_madt_gicc, 0);
1547
1548         return (count > 0);
1549 }
1550
1551 #define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K)
1552 #define ACPI_GICV2_VCTRL_MEM_SIZE       (SZ_4K)
1553 #define ACPI_GICV2_VCPU_MEM_SIZE        (SZ_8K)
1554
1555 static void __init gic_acpi_setup_kvm_info(void)
1556 {
1557         int irq;
1558
1559         if (!gic_acpi_collect_virt_info()) {
1560                 pr_warn("Unable to get hardware information used for virtualization\n");
1561                 return;
1562         }
1563
1564         gic_v3_kvm_info.type = GIC_V3;
1565
1566         irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
1567                                 acpi_data.maint_irq_mode,
1568                                 ACPI_ACTIVE_HIGH);
1569         if (irq <= 0)
1570                 return;
1571
1572         gic_v3_kvm_info.maint_irq = irq;
1573
1574         if (acpi_data.vcpu_base) {
1575                 struct resource *vcpu = &gic_v3_kvm_info.vcpu;
1576
1577                 vcpu->flags = IORESOURCE_MEM;
1578                 vcpu->start = acpi_data.vcpu_base;
1579                 vcpu->end = vcpu->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
1580         }
1581
1582         gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
1583         gic_set_kvm_info(&gic_v3_kvm_info);
1584 }
1585
1586 static int __init
1587 gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end)
1588 {
1589         struct acpi_madt_generic_distributor *dist;
1590         struct fwnode_handle *domain_handle;
1591         size_t size;
1592         int i, err;
1593
1594         /* Get distributor base address */
1595         dist = (struct acpi_madt_generic_distributor *)header;
1596         acpi_data.dist_base = ioremap(dist->base_address,
1597                                       ACPI_GICV3_DIST_MEM_SIZE);
1598         if (!acpi_data.dist_base) {
1599                 pr_err("Unable to map GICD registers\n");
1600                 return -ENOMEM;
1601         }
1602
1603         err = gic_validate_dist_version(acpi_data.dist_base);
1604         if (err) {
1605                 pr_err("No distributor detected at @%p, giving up\n",
1606                        acpi_data.dist_base);
1607                 goto out_dist_unmap;
1608         }
1609
1610         size = sizeof(*acpi_data.redist_regs) * acpi_data.nr_redist_regions;
1611         acpi_data.redist_regs = kzalloc(size, GFP_KERNEL);
1612         if (!acpi_data.redist_regs) {
1613                 err = -ENOMEM;
1614                 goto out_dist_unmap;
1615         }
1616
1617         err = gic_acpi_collect_gicr_base();
1618         if (err)
1619                 goto out_redist_unmap;
1620
1621         domain_handle = irq_domain_alloc_fwnode(acpi_data.dist_base);
1622         if (!domain_handle) {
1623                 err = -ENOMEM;
1624                 goto out_redist_unmap;
1625         }
1626
1627         err = gic_init_bases(acpi_data.dist_base, acpi_data.redist_regs,
1628                              acpi_data.nr_redist_regions, 0, domain_handle);
1629         if (err)
1630                 goto out_fwhandle_free;
1631
1632         acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1633
1634         if (static_branch_likely(&supports_deactivate_key))
1635                 gic_acpi_setup_kvm_info();
1636
1637         return 0;
1638
1639 out_fwhandle_free:
1640         irq_domain_free_fwnode(domain_handle);
1641 out_redist_unmap:
1642         for (i = 0; i < acpi_data.nr_redist_regions; i++)
1643                 if (acpi_data.redist_regs[i].redist_base)
1644                         iounmap(acpi_data.redist_regs[i].redist_base);
1645         kfree(acpi_data.redist_regs);
1646 out_dist_unmap:
1647         iounmap(acpi_data.dist_base);
1648         return err;
1649 }
1650 IRQCHIP_ACPI_DECLARE(gic_v3, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1651                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V3,
1652                      gic_acpi_init);
1653 IRQCHIP_ACPI_DECLARE(gic_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1654                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V4,
1655                      gic_acpi_init);
1656 IRQCHIP_ACPI_DECLARE(gic_v3_or_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1657                      acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_NONE,
1658                      gic_acpi_init);
1659 #endif