1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2013-2017 ARM Limited, All Rights Reserved.
   4 * Author: Marc Zyngier <marc.zyngier@arm.com>
   5 */
   6
   7#define pr_fmt(fmt)	"GICv3: " fmt
   8
   9#include <linux/acpi.h>
  10#include <linux/cpu.h>
  11#include <linux/cpu_pm.h>
  12#include <linux/delay.h>
  13#include <linux/interrupt.h>
  14#include <linux/irqdomain.h>
  15#include <linux/of.h>
  16#include <linux/of_address.h>
  17#include <linux/of_irq.h>
  18#include <linux/percpu.h>
  19#include <linux/refcount.h>
  20#include <linux/slab.h>
  21
  22#include <linux/irqchip.h>
  23#include <linux/irqchip/arm-gic-common.h>
  24#include <linux/irqchip/arm-gic-v3.h>
  25#include <linux/irqchip/irq-partition-percpu.h>
  26
  27#include <asm/cputype.h>
  28#include <asm/exception.h>
  29#include <asm/smp_plat.h>
  30#include <asm/virt.h>
  31
  32#include "irq-gic-common.h"
  33
  34#define GICD_INT_NMI_PRI	(GICD_INT_DEF_PRI & ~0x80)
  35
  36#define FLAGS_WORKAROUND_GICR_WAKER_MSM8996	(1ULL << 0)
  37#define FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539	(1ULL << 1)
  38
  39struct redist_region {
  40	void __iomem		*redist_base;
  41	phys_addr_t		phys_base;
  42	bool			single_redist;
  43};
  44
  45struct gic_chip_data {
  46	struct fwnode_handle	*fwnode;
  47	void __iomem		*dist_base;
  48	struct redist_region	*redist_regions;
  49	struct rdists		rdists;
  50	struct irq_domain	*domain;
  51	u64			redist_stride;
  52	u32			nr_redist_regions;
  53	u64			flags;
  54	bool			has_rss;
  55	unsigned int		ppi_nr;
  56	struct partition_desc	**ppi_descs;
  57};
  58
  59static struct gic_chip_data gic_data __read_mostly;
  60static DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
  61
  62#define GIC_ID_NR	(1U << GICD_TYPER_ID_BITS(gic_data.rdists.gicd_typer))
  63#define GIC_LINE_NR	min(GICD_TYPER_SPIS(gic_data.rdists.gicd_typer), 1020U)
  64#define GIC_ESPI_NR	GICD_TYPER_ESPIS(gic_data.rdists.gicd_typer)
  65
  66/*
  67 * The behaviours of RPR and PMR registers differ depending on the value of
  68 * SCR_EL3.FIQ, and the behaviour of non-secure priority registers of the
  69 * distributor and redistributors depends on whether security is enabled in the
  70 * GIC.
  71 *
  72 * When security is enabled, non-secure priority values from the (re)distributor
  73 * are presented to the GIC CPUIF as follow:
  74 *     (GIC_(R)DIST_PRI[irq] >> 1) | 0x80;
  75 *
  76 * If SCR_EL3.FIQ == 1, the values writen to/read from PMR and RPR at non-secure
  77 * EL1 are subject to a similar operation thus matching the priorities presented
  78 * from the (re)distributor when security is enabled.
  79 *
  80 * see GICv3/GICv4 Architecture Specification (IHI0069D):
  81 * - section 4.8.1 Non-secure accesses to register fields for Secure interrupt
  82 *   priorities.
  83 * - Figure 4-7 Secure read of the priority field for a Non-secure Group 1
  84 *   interrupt.
  85 *
  86 * For now, we only support pseudo-NMIs if we have non-secure view of
  87 * priorities.
  88 */
  89static DEFINE_STATIC_KEY_FALSE(supports_pseudo_nmis);
  90
  91/*
  92 * Global static key controlling whether an update to PMR allowing more
  93 * interrupts requires to be propagated to the redistributor (DSB SY).
  94 * And this needs to be exported for modules to be able to enable
  95 * interrupts...
  96 */
  97DEFINE_STATIC_KEY_FALSE(gic_pmr_sync);
  98EXPORT_SYMBOL(gic_pmr_sync);
  99
 100/* ppi_nmi_refs[n] == number of cpus having ppi[n + 16] set as NMI */
 101static refcount_t *ppi_nmi_refs;
 102
 103static struct gic_kvm_info gic_v3_kvm_info;
 104static DEFINE_PER_CPU(bool, has_rss);
 105
 106#define MPIDR_RS(mpidr)			(((mpidr) & 0xF0UL) >> 4)
 107#define gic_data_rdist()		(this_cpu_ptr(gic_data.rdists.rdist))
 108#define gic_data_rdist_rd_base()	(gic_data_rdist()->rd_base)
 109#define gic_data_rdist_sgi_base()	(gic_data_rdist_rd_base() + SZ_64K)
 110
 111/* Our default, arbitrary priority value. Linux only uses one anyway. */
 112#define DEFAULT_PMR_VALUE	0xf0
 113
 114enum gic_intid_range {
 115	PPI_RANGE,
 116	SPI_RANGE,
 117	EPPI_RANGE,
 118	ESPI_RANGE,
 119	LPI_RANGE,
 120	__INVALID_RANGE__
 121};
 122
 123static enum gic_intid_range __get_intid_range(irq_hw_number_t hwirq)
 124{
 125	switch (hwirq) {
 126	case 16 ... 31:
 127		return PPI_RANGE;
 128	case 32 ... 1019:
 129		return SPI_RANGE;
 130	case EPPI_BASE_INTID ... (EPPI_BASE_INTID + 63):
 131		return EPPI_RANGE;
 132	case ESPI_BASE_INTID ... (ESPI_BASE_INTID + 1023):
 133		return ESPI_RANGE;
 134	case 8192 ... GENMASK(23, 0):
 135		return LPI_RANGE;
 136	default:
 137		return __INVALID_RANGE__;
 138	}
 139}
 140
 141static enum gic_intid_range get_intid_range(struct irq_data *d)
 142{
 143	return __get_intid_range(d->hwirq);
 144}
 145
 146static inline unsigned int gic_irq(struct irq_data *d)
 147{
 148	return d->hwirq;
 149}
 150
 151static inline int gic_irq_in_rdist(struct irq_data *d)
 152{
 153	enum gic_intid_range range = get_intid_range(d);
 154	return range == PPI_RANGE || range == EPPI_RANGE;
 155}
 156
 157static inline void __iomem *gic_dist_base(struct irq_data *d)
 158{
 159	switch (get_intid_range(d)) {
 160	case PPI_RANGE:
 161	case EPPI_RANGE:
 162		/* SGI+PPI -> SGI_base for this CPU */
 163		return gic_data_rdist_sgi_base();
 164
 165	case SPI_RANGE:
 166	case ESPI_RANGE:
 167		/* SPI -> dist_base */
 168		return gic_data.dist_base;
 169
 170	default:
 171		return NULL;
 172	}
 173}
 174
 175static void gic_do_wait_for_rwp(void __iomem *base)
 176{
 177	u32 count = 1000000;	/* 1s! */
 178
 179	while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) {
 180		count--;
 181		if (!count) {
 182			pr_err_ratelimited("RWP timeout, gone fishing\n");
 183			return;
 184		}
 185		cpu_relax();
 186		udelay(1);
 187	}
 188}
 189
 190/* Wait for completion of a distributor change */
 191static void gic_dist_wait_for_rwp(void)
 192{
 193	gic_do_wait_for_rwp(gic_data.dist_base);
 194}
 195
 196/* Wait for completion of a redistributor change */
 197static void gic_redist_wait_for_rwp(void)
 198{
 199	gic_do_wait_for_rwp(gic_data_rdist_rd_base());
 200}
 201
 202#ifdef CONFIG_ARM64
 203
 204static u64 __maybe_unused gic_read_iar(void)
 205{
 206	if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_23154))
 207		return gic_read_iar_cavium_thunderx();
 208	else
 209		return gic_read_iar_common();
 210}
 211#endif
 212
 213static void gic_enable_redist(bool enable)
 214{
 215	void __iomem *rbase;
 216	u32 count = 1000000;	/* 1s! */
 217	u32 val;
 218
 219	if (gic_data.flags & FLAGS_WORKAROUND_GICR_WAKER_MSM8996)
 220		return;
 221
 222	rbase = gic_data_rdist_rd_base();
 223
 224	val = readl_relaxed(rbase + GICR_WAKER);
 225	if (enable)
 226		/* Wake up this CPU redistributor */
 227		val &= ~GICR_WAKER_ProcessorSleep;
 228	else
 229		val |= GICR_WAKER_ProcessorSleep;
 230	writel_relaxed(val, rbase + GICR_WAKER);
 231
 232	if (!enable) {		/* Check that GICR_WAKER is writeable */
 233		val = readl_relaxed(rbase + GICR_WAKER);
 234		if (!(val & GICR_WAKER_ProcessorSleep))
 235			return;	/* No PM support in this redistributor */
 236	}
 237
 238	while (--count) {
 239		val = readl_relaxed(rbase + GICR_WAKER);
 240		if (enable ^ (bool)(val & GICR_WAKER_ChildrenAsleep))
 241			break;
 242		cpu_relax();
 243		udelay(1);
 244	}
 245	if (!count)
 246		pr_err_ratelimited("redistributor failed to %s...\n",
 247				   enable ? "wakeup" : "sleep");
 248}
 249
 250/*
 251 * Routines to disable, enable, EOI and route interrupts
 252 */
 253static u32 convert_offset_index(struct irq_data *d, u32 offset, u32 *index)
 254{
 255	switch (get_intid_range(d)) {
 256	case PPI_RANGE:
 257	case SPI_RANGE:
 258		*index = d->hwirq;
 259		return offset;
 260	case EPPI_RANGE:
 261		/*
 262		 * Contrary to the ESPI range, the EPPI range is contiguous
 263		 * to the PPI range in the registers, so let's adjust the
 264		 * displacement accordingly. Consistency is overrated.
 265		 */
 266		*index = d->hwirq - EPPI_BASE_INTID + 32;
 267		return offset;
 268	case ESPI_RANGE:
 269		*index = d->hwirq - ESPI_BASE_INTID;
 270		switch (offset) {
 271		case GICD_ISENABLER:
 272			return GICD_ISENABLERnE;
 273		case GICD_ICENABLER:
 274			return GICD_ICENABLERnE;
 275		case GICD_ISPENDR:
 276			return GICD_ISPENDRnE;
 277		case GICD_ICPENDR:
 278			return GICD_ICPENDRnE;
 279		case GICD_ISACTIVER:
 280			return GICD_ISACTIVERnE;
 281		case GICD_ICACTIVER:
 282			return GICD_ICACTIVERnE;
 283		case GICD_IPRIORITYR:
 284			return GICD_IPRIORITYRnE;
 285		case GICD_ICFGR:
 286			return GICD_ICFGRnE;
 287		case GICD_IROUTER:
 288			return GICD_IROUTERnE;
 289		default:
 290			break;
 291		}
 292		break;
 293	default:
 294		break;
 295	}
 296
 297	WARN_ON(1);
 298	*index = d->hwirq;
 299	return offset;
 300}
 301
 302static int gic_peek_irq(struct irq_data *d, u32 offset)
 303{
 304	void __iomem *base;
 305	u32 index, mask;
 306
 307	offset = convert_offset_index(d, offset, &index);
 308	mask = 1 << (index % 32);
 309
 310	if (gic_irq_in_rdist(d))
 311		base = gic_data_rdist_sgi_base();
 312	else
 313		base = gic_data.dist_base;
 314
 315	return !!(readl_relaxed(base + offset + (index / 32) * 4) & mask);
 316}
 317
 318static void gic_poke_irq(struct irq_data *d, u32 offset)
 319{
 320	void (*rwp_wait)(void);
 321	void __iomem *base;
 322	u32 index, mask;
 323
 324	offset = convert_offset_index(d, offset, &index);
 325	mask = 1 << (index % 32);
 326
 327	if (gic_irq_in_rdist(d)) {
 328		base = gic_data_rdist_sgi_base();
 329		rwp_wait = gic_redist_wait_for_rwp;
 330	} else {
 331		base = gic_data.dist_base;
 332		rwp_wait = gic_dist_wait_for_rwp;
 333	}
 334
 335	writel_relaxed(mask, base + offset + (index / 32) * 4);
 336	rwp_wait();
 337}
 338
 339static void gic_mask_irq(struct irq_data *d)
 340{
 341	gic_poke_irq(d, GICD_ICENABLER);
 342}
 343
 344static void gic_eoimode1_mask_irq(struct irq_data *d)
 345{
 346	gic_mask_irq(d);
 347	/*
 348	 * When masking a forwarded interrupt, make sure it is
 349	 * deactivated as well.
 350	 *
 351	 * This ensures that an interrupt that is getting
 352	 * disabled/masked will not get "stuck", because there is
 353	 * noone to deactivate it (guest is being terminated).
 354	 */
 355	if (irqd_is_forwarded_to_vcpu(d))
 356		gic_poke_irq(d, GICD_ICACTIVER);
 357}
 358
 359static void gic_unmask_irq(struct irq_data *d)
 360{
 361	gic_poke_irq(d, GICD_ISENABLER);
 362}
 363
 364static inline bool gic_supports_nmi(void)
 365{
 366	return IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) &&
 367	       static_branch_likely(&supports_pseudo_nmis);
 368}
 369
 370static int gic_irq_set_irqchip_state(struct irq_data *d,
 371				     enum irqchip_irq_state which, bool val)
 372{
 373	u32 reg;
 374
 375	if (d->hwirq >= 8192) /* PPI/SPI only */
 376		return -EINVAL;
 377
 378	switch (which) {
 379	case IRQCHIP_STATE_PENDING:
 380		reg = val ? GICD_ISPENDR : GICD_ICPENDR;
 381		break;
 382
 383	case IRQCHIP_STATE_ACTIVE:
 384		reg = val ? GICD_ISACTIVER : GICD_ICACTIVER;
 385		break;
 386
 387	case IRQCHIP_STATE_MASKED:
 388		reg = val ? GICD_ICENABLER : GICD_ISENABLER;
 389		break;
 390
 391	default:
 392		return -EINVAL;
 393	}
 394
 395	gic_poke_irq(d, reg);
 396	return 0;
 397}
 398
 399static int gic_irq_get_irqchip_state(struct irq_data *d,
 400				     enum irqchip_irq_state which, bool *val)
 401{
 402	if (d->hwirq >= 8192) /* PPI/SPI only */
 403		return -EINVAL;
 404
 405	switch (which) {
 406	case IRQCHIP_STATE_PENDING:
 407		*val = gic_peek_irq(d, GICD_ISPENDR);
 408		break;
 409
 410	case IRQCHIP_STATE_ACTIVE:
 411		*val = gic_peek_irq(d, GICD_ISACTIVER);
 412		break;
 413
 414	case IRQCHIP_STATE_MASKED:
 415		*val = !gic_peek_irq(d, GICD_ISENABLER);
 416		break;
 417
 418	default:
 419		return -EINVAL;
 420	}
 421
 422	return 0;
 423}
 424
 425static void gic_irq_set_prio(struct irq_data *d, u8 prio)
 426{
 427	void __iomem *base = gic_dist_base(d);
 428	u32 offset, index;
 429
 430	offset = convert_offset_index(d, GICD_IPRIORITYR, &index);
 431
 432	writeb_relaxed(prio, base + offset + index);
 433}
 434
 435static u32 gic_get_ppi_index(struct irq_data *d)
 436{
 437	switch (get_intid_range(d)) {
 438	case PPI_RANGE:
 439		return d->hwirq - 16;
 440	case EPPI_RANGE:
 441		return d->hwirq - EPPI_BASE_INTID + 16;
 442	default:
 443		unreachable();
 444	}
 445}
 446
 447static int gic_irq_nmi_setup(struct irq_data *d)
 448{
 449	struct irq_desc *desc = irq_to_desc(d->irq);
 450
 451	if (!gic_supports_nmi())
 452		return -EINVAL;
 453
 454	if (gic_peek_irq(d, GICD_ISENABLER)) {
 455		pr_err("Cannot set NMI property of enabled IRQ %u\n", d->irq);
 456		return -EINVAL;
 457	}
 458
 459	/*
 460	 * A secondary irq_chip should be in charge of LPI request,
 461	 * it should not be possible to get there
 462	 */
 463	if (WARN_ON(gic_irq(d) >= 8192))
 464		return -EINVAL;
 465
 466	/* desc lock should already be held */
 467	if (gic_irq_in_rdist(d)) {
 468		u32 idx = gic_get_ppi_index(d);
 469
 470		/* Setting up PPI as NMI, only switch handler for first NMI */
 471		if (!refcount_inc_not_zero(&ppi_nmi_refs[idx])) {
 472			refcount_set(&ppi_nmi_refs[idx], 1);
 473			desc->handle_irq = handle_percpu_devid_fasteoi_nmi;
 474		}
 475	} else {
 476		desc->handle_irq = handle_fasteoi_nmi;
 477	}
 478
 479	gic_irq_set_prio(d, GICD_INT_NMI_PRI);
 480
 481	return 0;
 482}
 483
 484static void gic_irq_nmi_teardown(struct irq_data *d)
 485{
 486	struct irq_desc *desc = irq_to_desc(d->irq);
 487
 488	if (WARN_ON(!gic_supports_nmi()))
 489		return;
 490
 491	if (gic_peek_irq(d, GICD_ISENABLER)) {
 492		pr_err("Cannot set NMI property of enabled IRQ %u\n", d->irq);
 493		return;
 494	}
 495
 496	/*
 497	 * A secondary irq_chip should be in charge of LPI request,
 498	 * it should not be possible to get there
 499	 */
 500	if (WARN_ON(gic_irq(d) >= 8192))
 501		return;
 502
 503	/* desc lock should already be held */
 504	if (gic_irq_in_rdist(d)) {
 505		u32 idx = gic_get_ppi_index(d);
 506
 507		/* Tearing down NMI, only switch handler for last NMI */
 508		if (refcount_dec_and_test(&ppi_nmi_refs[idx]))
 509			desc->handle_irq = handle_percpu_devid_irq;
 510	} else {
 511		desc->handle_irq = handle_fasteoi_irq;
 512	}
 513
 514	gic_irq_set_prio(d, GICD_INT_DEF_PRI);
 515}
 516
 517static void gic_eoi_irq(struct irq_data *d)
 518{
 519	gic_write_eoir(gic_irq(d));
 520}
 521
 522static void gic_eoimode1_eoi_irq(struct irq_data *d)
 523{
 524	/*
 525	 * No need to deactivate an LPI, or an interrupt that
 526	 * is is getting forwarded to a vcpu.
 527	 */
 528	if (gic_irq(d) >= 8192 || irqd_is_forwarded_to_vcpu(d))
 529		return;
 530	gic_write_dir(gic_irq(d));
 531}
 532
 533static int gic_set_type(struct irq_data *d, unsigned int type)
 534{
 535	enum gic_intid_range range;
 536	unsigned int irq = gic_irq(d);
 537	void (*rwp_wait)(void);
 538	void __iomem *base;
 539	u32 offset, index;
 540	int ret;
 541
 542	/* Interrupt configuration for SGIs can't be changed */
 543	if (irq < 16)
 544		return -EINVAL;
 545
 546	range = get_intid_range(d);
 547
 548	/* SPIs have restrictions on the supported types */
 549	if ((range == SPI_RANGE || range == ESPI_RANGE) &&
 550	    type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
 551		return -EINVAL;
 552
 553	if (gic_irq_in_rdist(d)) {
 554		base = gic_data_rdist_sgi_base();
 555		rwp_wait = gic_redist_wait_for_rwp;
 556	} else {
 557		base = gic_data.dist_base;
 558		rwp_wait = gic_dist_wait_for_rwp;
 559	}
 560
 561	offset = convert_offset_index(d, GICD_ICFGR, &index);
 562
 563	ret = gic_configure_irq(index, type, base + offset, rwp_wait);
 564	if (ret && (range == PPI_RANGE || range == EPPI_RANGE)) {
 565		/* Misconfigured PPIs are usually not fatal */
 566		pr_warn("GIC: PPI INTID%d is secure or misconfigured\n", irq);
 567		ret = 0;
 568	}
 569
 570	return ret;
 571}
 572
 573static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
 574{
 575	if (vcpu)
 576		irqd_set_forwarded_to_vcpu(d);
 577	else
 578		irqd_clr_forwarded_to_vcpu(d);
 579	return 0;
 580}
 581
 582static u64 gic_mpidr_to_affinity(unsigned long mpidr)
 583{
 584	u64 aff;
 585
 586	aff = ((u64)MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 |
 587	       MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 588	       MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8  |
 589	       MPIDR_AFFINITY_LEVEL(mpidr, 0));
 590
 591	return aff;
 592}
 593
 594static void gic_deactivate_unhandled(u32 irqnr)
 595{
 596	if (static_branch_likely(&supports_deactivate_key)) {
 597		if (irqnr < 8192)
 598			gic_write_dir(irqnr);
 599	} else {
 600		gic_write_eoir(irqnr);
 601	}
 602}
 603
 604static inline void gic_handle_nmi(u32 irqnr, struct pt_regs *regs)
 605{
 606	bool irqs_enabled = interrupts_enabled(regs);
 607	int err;
 608
 609	if (irqs_enabled)
 610		nmi_enter();
 611
 612	if (static_branch_likely(&supports_deactivate_key))
 613		gic_write_eoir(irqnr);
 614	/*
 615	 * Leave the PSR.I bit set to prevent other NMIs to be
 616	 * received while handling this one.
 617	 * PSR.I will be restored when we ERET to the
 618	 * interrupted context.
 619	 */
 620	err = handle_domain_nmi(gic_data.domain, irqnr, regs);
 621	if (err)
 622		gic_deactivate_unhandled(irqnr);
 623
 624	if (irqs_enabled)
 625		nmi_exit();
 626}
 627
 628static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 629{
 630	u32 irqnr;
 631
 632	irqnr = gic_read_iar();
 633
 634	if (gic_supports_nmi() &&
 635	    unlikely(gic_read_rpr() == GICD_INT_NMI_PRI)) {
 636		gic_handle_nmi(irqnr, regs);
 637		return;
 638	}
 639
 640	if (gic_prio_masking_enabled()) {
 641		gic_pmr_mask_irqs();
 642		gic_arch_enable_irqs();
 643	}
 644
 645	/* Check for special IDs first */
 646	if ((irqnr >= 1020 && irqnr <= 1023))
 647		return;
 648
 649	/* Treat anything but SGIs in a uniform way */
 650	if (likely(irqnr > 15)) {
 651		int err;
 652
 653		if (static_branch_likely(&supports_deactivate_key))
 654			gic_write_eoir(irqnr);
 655		else
 656			isb();
 657
 658		err = handle_domain_irq(gic_data.domain, irqnr, regs);
 659		if (err) {
 660			WARN_ONCE(true, "Unexpected interrupt received!\n");
 661			gic_deactivate_unhandled(irqnr);
 662		}
 663		return;
 664	}
 665	if (irqnr < 16) {
 666		gic_write_eoir(irqnr);
 667		if (static_branch_likely(&supports_deactivate_key))
 668			gic_write_dir(irqnr);
 669#ifdef CONFIG_SMP
 670		/*
 671		 * Unlike GICv2, we don't need an smp_rmb() here.
 672		 * The control dependency from gic_read_iar to
 673		 * the ISB in gic_write_eoir is enough to ensure
 674		 * that any shared data read by handle_IPI will
 675		 * be read after the ACK.
 676		 */
 677		handle_IPI(irqnr, regs);
 678#else
 679		WARN_ONCE(true, "Unexpected SGI received!\n");
 680#endif
 681	}
 682}
 683
 684static u32 gic_get_pribits(void)
 685{
 686	u32 pribits;
 687
 688	pribits = gic_read_ctlr();
 689	pribits &= ICC_CTLR_EL1_PRI_BITS_MASK;
 690	pribits >>= ICC_CTLR_EL1_PRI_BITS_SHIFT;
 691	pribits++;
 692
 693	return pribits;
 694}
 695
 696static bool gic_has_group0(void)
 697{
 698	u32 val;
 699	u32 old_pmr;
 700
 701	old_pmr = gic_read_pmr();
 702
 703	/*
 704	 * Let's find out if Group0 is under control of EL3 or not by
 705	 * setting the highest possible, non-zero priority in PMR.
 706	 *
 707	 * If SCR_EL3.FIQ is set, the priority gets shifted down in
 708	 * order for the CPU interface to set bit 7, and keep the
 709	 * actual priority in the non-secure range. In the process, it
 710	 * looses the least significant bit and the actual priority
 711	 * becomes 0x80. Reading it back returns 0, indicating that
 712	 * we're don't have access to Group0.
 713	 */
 714	gic_write_pmr(BIT(8 - gic_get_pribits()));
 715	val = gic_read_pmr();
 716
 717	gic_write_pmr(old_pmr);
 718
 719	return val != 0;
 720}
 721
 722static void __init gic_dist_init(void)
 723{
 724	unsigned int i;
 725	u64 affinity;
 726	void __iomem *base = gic_data.dist_base;
 727	u32 val;
 728
 729	/* Disable the distributor */
 730	writel_relaxed(0, base + GICD_CTLR);
 731	gic_dist_wait_for_rwp();
 732
 733	/*
 734	 * Configure SPIs as non-secure Group-1. This will only matter
 735	 * if the GIC only has a single security state. This will not
 736	 * do the right thing if the kernel is running in secure mode,
 737	 * but that's not the intended use case anyway.
 738	 */
 739	for (i = 32; i < GIC_LINE_NR; i += 32)
 740		writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
 741
 742	/* Extended SPI range, not handled by the GICv2/GICv3 common code */
 743	for (i = 0; i < GIC_ESPI_NR; i += 32) {
 744		writel_relaxed(~0U, base + GICD_ICENABLERnE + i / 8);
 745		writel_relaxed(~0U, base + GICD_ICACTIVERnE + i / 8);
 746	}
 747
 748	for (i = 0; i < GIC_ESPI_NR; i += 32)
 749		writel_relaxed(~0U, base + GICD_IGROUPRnE + i / 8);
 750
 751	for (i = 0; i < GIC_ESPI_NR; i += 16)
 752		writel_relaxed(0, base + GICD_ICFGRnE + i / 4);
 753
 754	for (i = 0; i < GIC_ESPI_NR; i += 4)
 755		writel_relaxed(GICD_INT_DEF_PRI_X4, base + GICD_IPRIORITYRnE + i);
 756
 757	/* Now do the common stuff, and wait for the distributor to drain */
 758	gic_dist_config(base, GIC_LINE_NR, gic_dist_wait_for_rwp);
 759
 760	val = GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1;
 761	if (gic_data.rdists.gicd_typer2 & GICD_TYPER2_nASSGIcap) {
 762		pr_info("Enabling SGIs without active state\n");
 763		val |= GICD_CTLR_nASSGIreq;
 764	}
 765
 766	/* Enable distributor with ARE, Group1 */
 767	writel_relaxed(val, base + GICD_CTLR);
 
 768
 769	/*
 770	 * Set all global interrupts to the boot CPU only. ARE must be
 771	 * enabled.
 772	 */
 773	affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
 774	for (i = 32; i < GIC_LINE_NR; i++)
 775		gic_write_irouter(affinity, base + GICD_IROUTER + i * 8);
 776
 777	for (i = 0; i < GIC_ESPI_NR; i++)
 778		gic_write_irouter(affinity, base + GICD_IROUTERnE + i * 8);
 779}
 780
 781static int gic_iterate_rdists(int (*fn)(struct redist_region *, void __iomem *))
 782{
 783	int ret = -ENODEV;
 784	int i;
 785
 786	for (i = 0; i < gic_data.nr_redist_regions; i++) {
 787		void __iomem *ptr = gic_data.redist_regions[i].redist_base;
 788		u64 typer;
 789		u32 reg;
 790
 791		reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
 792		if (reg != GIC_PIDR2_ARCH_GICv3 &&
 793		    reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */
 794			pr_warn("No redistributor present @%p\n", ptr);
 795			break;
 796		}
 797
 798		do {
 799			typer = gic_read_typer(ptr + GICR_TYPER);
 800			ret = fn(gic_data.redist_regions + i, ptr);
 801			if (!ret)
 802				return 0;
 803
 804			if (gic_data.redist_regions[i].single_redist)
 805				break;
 806
 807			if (gic_data.redist_stride) {
 808				ptr += gic_data.redist_stride;
 809			} else {
 810				ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
 811				if (typer & GICR_TYPER_VLPIS)
 812					ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
 813			}
 814		} while (!(typer & GICR_TYPER_LAST));
 815	}
 816
 817	return ret ? -ENODEV : 0;
 818}
 819
 820static int __gic_populate_rdist(struct redist_region *region, void __iomem *ptr)
 821{
 822	unsigned long mpidr = cpu_logical_map(smp_processor_id());
 823	u64 typer;
 824	u32 aff;
 825
 826	/*
 827	 * Convert affinity to a 32bit value that can be matched to
 828	 * GICR_TYPER bits [63:32].
 829	 */
 830	aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
 831	       MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
 832	       MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
 833	       MPIDR_AFFINITY_LEVEL(mpidr, 0));
 834
 835	typer = gic_read_typer(ptr + GICR_TYPER);
 836	if ((typer >> 32) == aff) {
 837		u64 offset = ptr - region->redist_base;
 838		raw_spin_lock_init(&gic_data_rdist()->rd_lock);
 839		gic_data_rdist_rd_base() = ptr;
 840		gic_data_rdist()->phys_base = region->phys_base + offset;
 841
 842		pr_info("CPU%d: found redistributor %lx region %d:%pa\n",
 843			smp_processor_id(), mpidr,
 844			(int)(region - gic_data.redist_regions),
 845			&gic_data_rdist()->phys_base);
 846		return 0;
 847	}
 848
 849	/* Try next one */
 850	return 1;
 851}
 852
 853static int gic_populate_rdist(void)
 854{
 855	if (gic_iterate_rdists(__gic_populate_rdist) == 0)
 856		return 0;
 857
 858	/* We couldn't even deal with ourselves... */
 859	WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n",
 860	     smp_processor_id(),
 861	     (unsigned long)cpu_logical_map(smp_processor_id()));
 862	return -ENODEV;
 863}
 864
 865static int __gic_update_rdist_properties(struct redist_region *region,
 866					 void __iomem *ptr)
 867{
 868	u64 typer = gic_read_typer(ptr + GICR_TYPER);
 869
 870	gic_data.rdists.has_vlpis &= !!(typer & GICR_TYPER_VLPIS);
 871
 872	/* RVPEID implies some form of DirectLPI, no matter what the doc says... :-/ */
 873	gic_data.rdists.has_rvpeid &= !!(typer & GICR_TYPER_RVPEID);
 874	gic_data.rdists.has_direct_lpi &= (!!(typer & GICR_TYPER_DirectLPIS) |
 875					   gic_data.rdists.has_rvpeid);
 876	gic_data.rdists.has_vpend_valid_dirty &= !!(typer & GICR_TYPER_DIRTY);
 877
 878	/* Detect non-sensical configurations */
 879	if (WARN_ON_ONCE(gic_data.rdists.has_rvpeid && !gic_data.rdists.has_vlpis)) {
 880		gic_data.rdists.has_direct_lpi = false;
 881		gic_data.rdists.has_vlpis = false;
 882		gic_data.rdists.has_rvpeid = false;
 883	}
 884
 885	gic_data.ppi_nr = min(GICR_TYPER_NR_PPIS(typer), gic_data.ppi_nr);
 886
 887	return 1;
 888}
 889
 890static void gic_update_rdist_properties(void)
 891{
 892	gic_data.ppi_nr = UINT_MAX;
 893	gic_iterate_rdists(__gic_update_rdist_properties);
 894	if (WARN_ON(gic_data.ppi_nr == UINT_MAX))
 895		gic_data.ppi_nr = 0;
 896	pr_info("%d PPIs implemented\n", gic_data.ppi_nr);
 897	if (gic_data.rdists.has_vlpis)
 898		pr_info("GICv4 features: %s%s%s\n",
 899			gic_data.rdists.has_direct_lpi ? "DirectLPI " : "",
 900			gic_data.rdists.has_rvpeid ? "RVPEID " : "",
 901			gic_data.rdists.has_vpend_valid_dirty ? "Valid+Dirty " : "");
 902}
 903
 904/* Check whether it's single security state view */
 905static inline bool gic_dist_security_disabled(void)
 906{
 907	return readl_relaxed(gic_data.dist_base + GICD_CTLR) & GICD_CTLR_DS;
 908}
 909
 910static void gic_cpu_sys_reg_init(void)
 911{
 912	int i, cpu = smp_processor_id();
 913	u64 mpidr = cpu_logical_map(cpu);
 914	u64 need_rss = MPIDR_RS(mpidr);
 915	bool group0;
 916	u32 pribits;
 917
 918	/*
 919	 * Need to check that the SRE bit has actually been set. If
 920	 * not, it means that SRE is disabled at EL2. We're going to
 921	 * die painfully, and there is nothing we can do about it.
 922	 *
 923	 * Kindly inform the luser.
 924	 */
 925	if (!gic_enable_sre())
 926		pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
 927
 928	pribits = gic_get_pribits();
 929
 930	group0 = gic_has_group0();
 931
 932	/* Set priority mask register */
 933	if (!gic_prio_masking_enabled()) {
 934		write_gicreg(DEFAULT_PMR_VALUE, ICC_PMR_EL1);
 935	} else {
 936		/*
 937		 * Mismatch configuration with boot CPU, the system is likely
 938		 * to die as interrupt masking will not work properly on all
 939		 * CPUs
 940		 */
 941		WARN_ON(gic_supports_nmi() && group0 &&
 942			!gic_dist_security_disabled());
 943	}
 944
 945	/*
 946	 * Some firmwares hand over to the kernel with the BPR changed from
 947	 * its reset value (and with a value large enough to prevent
 948	 * any pre-emptive interrupts from working at all). Writing a zero
 949	 * to BPR restores is reset value.
 950	 */
 951	gic_write_bpr1(0);
 952
 953	if (static_branch_likely(&supports_deactivate_key)) {
 954		/* EOI drops priority only (mode 1) */
 955		gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop);
 956	} else {
 957		/* EOI deactivates interrupt too (mode 0) */
 958		gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
 959	}
 960
 961	/* Always whack Group0 before Group1 */
 962	if (group0) {
 963		switch(pribits) {
 964		case 8:
 965		case 7:
 966			write_gicreg(0, ICC_AP0R3_EL1);
 967			write_gicreg(0, ICC_AP0R2_EL1);
 968			fallthrough;
 969		case 6:
 970			write_gicreg(0, ICC_AP0R1_EL1);
 971			fallthrough;
 972		case 5:
 973		case 4:
 974			write_gicreg(0, ICC_AP0R0_EL1);
 975		}
 976
 977		isb();
 978	}
 979
 980	switch(pribits) {
 981	case 8:
 982	case 7:
 983		write_gicreg(0, ICC_AP1R3_EL1);
 984		write_gicreg(0, ICC_AP1R2_EL1);
 985		fallthrough;
 986	case 6:
 987		write_gicreg(0, ICC_AP1R1_EL1);
 988		fallthrough;
 989	case 5:
 990	case 4:
 991		write_gicreg(0, ICC_AP1R0_EL1);
 992	}
 993
 994	isb();
 995
 996	/* ... and let's hit the road... */
 997	gic_write_grpen1(1);
 998
 999	/* Keep the RSS capability status in per_cpu variable */
1000	per_cpu(has_rss, cpu) = !!(gic_read_ctlr() & ICC_CTLR_EL1_RSS);
1001
1002	/* Check all the CPUs have capable of sending SGIs to other CPUs */
1003	for_each_online_cpu(i) {
1004		bool have_rss = per_cpu(has_rss, i) && per_cpu(has_rss, cpu);
1005
1006		need_rss |= MPIDR_RS(cpu_logical_map(i));
1007		if (need_rss && (!have_rss))
1008			pr_crit("CPU%d (%lx) can't SGI CPU%d (%lx), no RSS\n",
1009				cpu, (unsigned long)mpidr,
1010				i, (unsigned long)cpu_logical_map(i));
1011	}
1012
1013	/**
1014	 * GIC spec says, when ICC_CTLR_EL1.RSS==1 and GICD_TYPER.RSS==0,
1015	 * writing ICC_ASGI1R_EL1 register with RS != 0 is a CONSTRAINED
1016	 * UNPREDICTABLE choice of :
1017	 *   - The write is ignored.
1018	 *   - The RS field is treated as 0.
1019	 */
1020	if (need_rss && (!gic_data.has_rss))
1021		pr_crit_once("RSS is required but GICD doesn't support it\n");
1022}
1023
1024static bool gicv3_nolpi;
1025
1026static int __init gicv3_nolpi_cfg(char *buf)
1027{
1028	return strtobool(buf, &gicv3_nolpi);
1029}
1030early_param("irqchip.gicv3_nolpi", gicv3_nolpi_cfg);
1031
1032static int gic_dist_supports_lpis(void)
1033{
1034	return (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) &&
1035		!!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS) &&
1036		!gicv3_nolpi);
1037}
1038
1039static void gic_cpu_init(void)
1040{
1041	void __iomem *rbase;
1042	int i;
1043
1044	/* Register ourselves with the rest of the world */
1045	if (gic_populate_rdist())
1046		return;
1047
1048	gic_enable_redist(true);
1049
1050	WARN((gic_data.ppi_nr > 16 || GIC_ESPI_NR != 0) &&
1051	     !(gic_read_ctlr() & ICC_CTLR_EL1_ExtRange),
1052	     "Distributor has extended ranges, but CPU%d doesn't\n",
1053	     smp_processor_id());
1054
1055	rbase = gic_data_rdist_sgi_base();
1056
1057	/* Configure SGIs/PPIs as non-secure Group-1 */
1058	for (i = 0; i < gic_data.ppi_nr + 16; i += 32)
1059		writel_relaxed(~0, rbase + GICR_IGROUPR0 + i / 8);
1060
1061	gic_cpu_config(rbase, gic_data.ppi_nr + 16, gic_redist_wait_for_rwp);
1062
1063	/* initialise system registers */
1064	gic_cpu_sys_reg_init();
1065}
1066
1067#ifdef CONFIG_SMP
1068
1069#define MPIDR_TO_SGI_RS(mpidr)	(MPIDR_RS(mpidr) << ICC_SGI1R_RS_SHIFT)
1070#define MPIDR_TO_SGI_CLUSTER_ID(mpidr)	((mpidr) & ~0xFUL)
1071
1072static int gic_starting_cpu(unsigned int cpu)
1073{
1074	gic_cpu_init();
1075
1076	if (gic_dist_supports_lpis())
1077		its_cpu_init();
1078
1079	return 0;
1080}
1081
1082static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask,
1083				   unsigned long cluster_id)
1084{
1085	int next_cpu, cpu = *base_cpu;
1086	unsigned long mpidr = cpu_logical_map(cpu);
1087	u16 tlist = 0;
1088
1089	while (cpu < nr_cpu_ids) {
1090		tlist |= 1 << (mpidr & 0xf);
1091
1092		next_cpu = cpumask_next(cpu, mask);
1093		if (next_cpu >= nr_cpu_ids)
1094			goto out;
1095		cpu = next_cpu;
1096
1097		mpidr = cpu_logical_map(cpu);
1098
1099		if (cluster_id != MPIDR_TO_SGI_CLUSTER_ID(mpidr)) {
1100			cpu--;
1101			goto out;
1102		}
1103	}
1104out:
1105	*base_cpu = cpu;
1106	return tlist;
1107}
1108
1109#define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
1110	(MPIDR_AFFINITY_LEVEL(cluster_id, level) \
1111		<< ICC_SGI1R_AFFINITY_## level ##_SHIFT)
1112
1113static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
1114{
1115	u64 val;
1116
1117	val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3)	|
1118	       MPIDR_TO_SGI_AFFINITY(cluster_id, 2)	|
1119	       irq << ICC_SGI1R_SGI_ID_SHIFT		|
1120	       MPIDR_TO_SGI_AFFINITY(cluster_id, 1)	|
1121	       MPIDR_TO_SGI_RS(cluster_id)		|
1122	       tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
1123
1124	pr_devel("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
1125	gic_write_sgi1r(val);
1126}
1127
1128static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
1129{
1130	int cpu;
1131
1132	if (WARN_ON(irq >= 16))
1133		return;
1134
1135	/*
1136	 * Ensure that stores to Normal memory are visible to the
1137	 * other CPUs before issuing the IPI.
1138	 */
1139	wmb();
1140
1141	for_each_cpu(cpu, mask) {
1142		u64 cluster_id = MPIDR_TO_SGI_CLUSTER_ID(cpu_logical_map(cpu));
1143		u16 tlist;
1144
1145		tlist = gic_compute_target_list(&cpu, mask, cluster_id);
1146		gic_send_sgi(cluster_id, tlist, irq);
1147	}
1148
1149	/* Force the above writes to ICC_SGI1R_EL1 to be executed */
1150	isb();
1151}
1152
1153static void __init gic_smp_init(void)
1154{
1155	set_smp_cross_call(gic_raise_softirq);
1156	cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
1157				  "irqchip/arm/gicv3:starting",
1158				  gic_starting_cpu, NULL);
1159}
1160
1161static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
1162			    bool force)
1163{
1164	unsigned int cpu;
1165	u32 offset, index;
1166	void __iomem *reg;
1167	int enabled;
1168	u64 val;
1169
1170	if (force)
1171		cpu = cpumask_first(mask_val);
1172	else
1173		cpu = cpumask_any_and(mask_val, cpu_online_mask);
1174
1175	if (cpu >= nr_cpu_ids)
1176		return -EINVAL;
1177
1178	if (gic_irq_in_rdist(d))
1179		return -EINVAL;
1180
1181	/* If interrupt was enabled, disable it first */
1182	enabled = gic_peek_irq(d, GICD_ISENABLER);
1183	if (enabled)
1184		gic_mask_irq(d);
1185
1186	offset = convert_offset_index(d, GICD_IROUTER, &index);
1187	reg = gic_dist_base(d) + offset + (index * 8);
1188	val = gic_mpidr_to_affinity(cpu_logical_map(cpu));
1189
1190	gic_write_irouter(val, reg);
1191
1192	/*
1193	 * If the interrupt was enabled, enabled it again. Otherwise,
1194	 * just wait for the distributor to have digested our changes.
1195	 */
1196	if (enabled)
1197		gic_unmask_irq(d);
1198	else
1199		gic_dist_wait_for_rwp();
1200
1201	irq_data_update_effective_affinity(d, cpumask_of(cpu));
1202
1203	return IRQ_SET_MASK_OK_DONE;
1204}
1205#else
1206#define gic_set_affinity	NULL
1207#define gic_smp_init()		do { } while(0)
1208#endif
1209
1210#ifdef CONFIG_CPU_PM
1211static int gic_cpu_pm_notifier(struct notifier_block *self,
1212			       unsigned long cmd, void *v)
1213{
1214	if (cmd == CPU_PM_EXIT) {
1215		if (gic_dist_security_disabled())
1216			gic_enable_redist(true);
1217		gic_cpu_sys_reg_init();
1218	} else if (cmd == CPU_PM_ENTER && gic_dist_security_disabled()) {
1219		gic_write_grpen1(0);
1220		gic_enable_redist(false);
1221	}
1222	return NOTIFY_OK;
1223}
1224
1225static struct notifier_block gic_cpu_pm_notifier_block = {
1226	.notifier_call = gic_cpu_pm_notifier,
1227};
1228
1229static void gic_cpu_pm_init(void)
1230{
1231	cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
1232}
1233
1234#else
1235static inline void gic_cpu_pm_init(void) { }
1236#endif /* CONFIG_CPU_PM */
1237
1238static struct irq_chip gic_chip = {
1239	.name			= "GICv3",
1240	.irq_mask		= gic_mask_irq,
1241	.irq_unmask		= gic_unmask_irq,
1242	.irq_eoi		= gic_eoi_irq,
1243	.irq_set_type		= gic_set_type,
1244	.irq_set_affinity	= gic_set_affinity,
1245	.irq_get_irqchip_state	= gic_irq_get_irqchip_state,
1246	.irq_set_irqchip_state	= gic_irq_set_irqchip_state,
1247	.irq_nmi_setup		= gic_irq_nmi_setup,
1248	.irq_nmi_teardown	= gic_irq_nmi_teardown,
1249	.flags			= IRQCHIP_SET_TYPE_MASKED |
1250				  IRQCHIP_SKIP_SET_WAKE |
1251				  IRQCHIP_MASK_ON_SUSPEND,
1252};
1253
1254static struct irq_chip gic_eoimode1_chip = {
1255	.name			= "GICv3",
1256	.irq_mask		= gic_eoimode1_mask_irq,
1257	.irq_unmask		= gic_unmask_irq,
1258	.irq_eoi		= gic_eoimode1_eoi_irq,
1259	.irq_set_type		= gic_set_type,
1260	.irq_set_affinity	= gic_set_affinity,
1261	.irq_get_irqchip_state	= gic_irq_get_irqchip_state,
1262	.irq_set_irqchip_state	= gic_irq_set_irqchip_state,
1263	.irq_set_vcpu_affinity	= gic_irq_set_vcpu_affinity,
1264	.irq_nmi_setup		= gic_irq_nmi_setup,
1265	.irq_nmi_teardown	= gic_irq_nmi_teardown,
1266	.flags			= IRQCHIP_SET_TYPE_MASKED |
1267				  IRQCHIP_SKIP_SET_WAKE |
1268				  IRQCHIP_MASK_ON_SUSPEND,
1269};
1270
1271static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
1272			      irq_hw_number_t hw)
1273{
1274	struct irq_chip *chip = &gic_chip;
1275
1276	if (static_branch_likely(&supports_deactivate_key))
1277		chip = &gic_eoimode1_chip;
1278
1279	switch (__get_intid_range(hw)) {
1280	case PPI_RANGE:
1281	case EPPI_RANGE:
1282		irq_set_percpu_devid(irq);
1283		irq_domain_set_info(d, irq, hw, chip, d->host_data,
1284				    handle_percpu_devid_irq, NULL, NULL);
 
1285		break;
1286
1287	case SPI_RANGE:
1288	case ESPI_RANGE:
1289		irq_domain_set_info(d, irq, hw, chip, d->host_data,
1290				    handle_fasteoi_irq, NULL, NULL);
1291		irq_set_probe(irq);
1292		irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
1293		break;
1294
1295	case LPI_RANGE:
1296		if (!gic_dist_supports_lpis())
1297			return -EPERM;
1298		irq_domain_set_info(d, irq, hw, chip, d->host_data,
1299				    handle_fasteoi_irq, NULL, NULL);
1300		break;
1301
1302	default:
1303		return -EPERM;
1304	}
1305
1306	return 0;
1307}
1308
1309#define GIC_IRQ_TYPE_PARTITION	(GIC_IRQ_TYPE_LPI + 1)
1310
1311static int gic_irq_domain_translate(struct irq_domain *d,
1312				    struct irq_fwspec *fwspec,
1313				    unsigned long *hwirq,
1314				    unsigned int *type)
1315{
1316	if (is_of_node(fwspec->fwnode)) {
1317		if (fwspec->param_count < 3)
1318			return -EINVAL;
1319
1320		switch (fwspec->param[0]) {
1321		case 0:			/* SPI */
1322			*hwirq = fwspec->param[1] + 32;
1323			break;
1324		case 1:			/* PPI */
1325			*hwirq = fwspec->param[1] + 16;
1326			break;
1327		case 2:			/* ESPI */
1328			*hwirq = fwspec->param[1] + ESPI_BASE_INTID;
1329			break;
1330		case 3:			/* EPPI */
1331			*hwirq = fwspec->param[1] + EPPI_BASE_INTID;
1332			break;
1333		case GIC_IRQ_TYPE_LPI:	/* LPI */
1334			*hwirq = fwspec->param[1];
1335			break;
1336		case GIC_IRQ_TYPE_PARTITION:
1337			*hwirq = fwspec->param[1];
1338			if (fwspec->param[1] >= 16)
1339				*hwirq += EPPI_BASE_INTID - 16;
1340			else
1341				*hwirq += 16;
1342			break;
1343		default:
1344			return -EINVAL;
1345		}
1346
1347		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1348
1349		/*
1350		 * Make it clear that broken DTs are... broken.
1351		 * Partitionned PPIs are an unfortunate exception.
1352		 */
1353		WARN_ON(*type == IRQ_TYPE_NONE &&
1354			fwspec->param[0] != GIC_IRQ_TYPE_PARTITION);
1355		return 0;
1356	}
1357
1358	if (is_fwnode_irqchip(fwspec->fwnode)) {
1359		if(fwspec->param_count != 2)
1360			return -EINVAL;
1361
1362		*hwirq = fwspec->param[0];
1363		*type = fwspec->param[1];
1364
1365		WARN_ON(*type == IRQ_TYPE_NONE);
1366		return 0;
1367	}
1368
1369	return -EINVAL;
1370}
1371
1372static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
1373				unsigned int nr_irqs, void *arg)
1374{
1375	int i, ret;
1376	irq_hw_number_t hwirq;
1377	unsigned int type = IRQ_TYPE_NONE;
1378	struct irq_fwspec *fwspec = arg;
1379
1380	ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
1381	if (ret)
1382		return ret;
1383
1384	for (i = 0; i < nr_irqs; i++) {
1385		ret = gic_irq_domain_map(domain, virq + i, hwirq + i);
1386		if (ret)
1387			return ret;
1388	}
1389
1390	return 0;
1391}
1392
1393static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
1394				unsigned int nr_irqs)
1395{
1396	int i;
1397
1398	for (i = 0; i < nr_irqs; i++) {
1399		struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
1400		irq_set_handler(virq + i, NULL);
1401		irq_domain_reset_irq_data(d);
1402	}
1403}
1404
1405static int gic_irq_domain_select(struct irq_domain *d,
1406				 struct irq_fwspec *fwspec,
1407				 enum irq_domain_bus_token bus_token)
1408{
1409	/* Not for us */
1410        if (fwspec->fwnode != d->fwnode)
1411		return 0;
1412
1413	/* If this is not DT, then we have a single domain */
1414	if (!is_of_node(fwspec->fwnode))
1415		return 1;
1416
1417	/*
1418	 * If this is a PPI and we have a 4th (non-null) parameter,
1419	 * then we need to match the partition domain.
1420	 */
1421	if (fwspec->param_count >= 4 &&
1422	    fwspec->param[0] == 1 && fwspec->param[3] != 0 &&
1423	    gic_data.ppi_descs)
1424		return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]);
1425
1426	return d == gic_data.domain;
1427}
1428
1429static const struct irq_domain_ops gic_irq_domain_ops = {
1430	.translate = gic_irq_domain_translate,
1431	.alloc = gic_irq_domain_alloc,
1432	.free = gic_irq_domain_free,
1433	.select = gic_irq_domain_select,
1434};
1435
1436static int partition_domain_translate(struct irq_domain *d,
1437				      struct irq_fwspec *fwspec,
1438				      unsigned long *hwirq,
1439				      unsigned int *type)
1440{
1441	struct device_node *np;
1442	int ret;
1443
1444	if (!gic_data.ppi_descs)
1445		return -ENOMEM;
1446
1447	np = of_find_node_by_phandle(fwspec->param[3]);
1448	if (WARN_ON(!np))
1449		return -EINVAL;
1450
1451	ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]],
1452				     of_node_to_fwnode(np));
1453	if (ret < 0)
1454		return ret;
1455
1456	*hwirq = ret;
1457	*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
1458
1459	return 0;
1460}
1461
1462static const struct irq_domain_ops partition_domain_ops = {
1463	.translate = partition_domain_translate,
1464	.select = gic_irq_domain_select,
1465};
1466
1467static bool gic_enable_quirk_msm8996(void *data)
1468{
1469	struct gic_chip_data *d = data;
1470
1471	d->flags |= FLAGS_WORKAROUND_GICR_WAKER_MSM8996;
1472
1473	return true;
1474}
1475
1476static bool gic_enable_quirk_cavium_38539(void *data)
1477{
1478	struct gic_chip_data *d = data;
1479
1480	d->flags |= FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539;
1481
1482	return true;
1483}
1484
1485static bool gic_enable_quirk_hip06_07(void *data)
1486{
1487	struct gic_chip_data *d = data;
1488
1489	/*
1490	 * HIP06 GICD_IIDR clashes with GIC-600 product number (despite
1491	 * not being an actual ARM implementation). The saving grace is
1492	 * that GIC-600 doesn't have ESPI, so nothing to do in that case.
1493	 * HIP07 doesn't even have a proper IIDR, and still pretends to
1494	 * have ESPI. In both cases, put them right.
1495	 */
1496	if (d->rdists.gicd_typer & GICD_TYPER_ESPI) {
1497		/* Zero both ESPI and the RES0 field next to it... */
1498		d->rdists.gicd_typer &= ~GENMASK(9, 8);
1499		return true;
1500	}
1501
1502	return false;
1503}
1504
1505static const struct gic_quirk gic_quirks[] = {
1506	{
1507		.desc	= "GICv3: Qualcomm MSM8996 broken firmware",
1508		.compatible = "qcom,msm8996-gic-v3",
1509		.init	= gic_enable_quirk_msm8996,
1510	},
1511	{
1512		.desc	= "GICv3: HIP06 erratum 161010803",
1513		.iidr	= 0x0204043b,
1514		.mask	= 0xffffffff,
1515		.init	= gic_enable_quirk_hip06_07,
1516	},
1517	{
1518		.desc	= "GICv3: HIP07 erratum 161010803",
1519		.iidr	= 0x00000000,
1520		.mask	= 0xffffffff,
1521		.init	= gic_enable_quirk_hip06_07,
1522	},
1523	{
1524		/*
1525		 * Reserved register accesses generate a Synchronous
1526		 * External Abort. This erratum applies to:
1527		 * - ThunderX: CN88xx
1528		 * - OCTEON TX: CN83xx, CN81xx
1529		 * - OCTEON TX2: CN93xx, CN96xx, CN98xx, CNF95xx*
1530		 */
1531		.desc	= "GICv3: Cavium erratum 38539",
1532		.iidr	= 0xa000034c,
1533		.mask	= 0xe8f00fff,
1534		.init	= gic_enable_quirk_cavium_38539,
1535	},
1536	{
1537	}
1538};
1539
1540static void gic_enable_nmi_support(void)
1541{
1542	int i;
1543
1544	if (!gic_prio_masking_enabled())
1545		return;
1546
1547	if (gic_has_group0() && !gic_dist_security_disabled()) {
1548		pr_warn("SCR_EL3.FIQ is cleared, cannot enable use of pseudo-NMIs\n");
1549		return;
1550	}
1551
1552	ppi_nmi_refs = kcalloc(gic_data.ppi_nr, sizeof(*ppi_nmi_refs), GFP_KERNEL);
1553	if (!ppi_nmi_refs)
1554		return;
1555
1556	for (i = 0; i < gic_data.ppi_nr; i++)
1557		refcount_set(&ppi_nmi_refs[i], 0);
1558
1559	/*
1560	 * Linux itself doesn't use 1:N distribution, so has no need to
1561	 * set PMHE. The only reason to have it set is if EL3 requires it
1562	 * (and we can't change it).
1563	 */
1564	if (gic_read_ctlr() & ICC_CTLR_EL1_PMHE_MASK)
1565		static_branch_enable(&gic_pmr_sync);
1566
1567	pr_info("%s ICC_PMR_EL1 synchronisation\n",
1568		static_branch_unlikely(&gic_pmr_sync) ? "Forcing" : "Relaxing");
1569
1570	static_branch_enable(&supports_pseudo_nmis);
1571
1572	if (static_branch_likely(&supports_deactivate_key))
1573		gic_eoimode1_chip.flags |= IRQCHIP_SUPPORTS_NMI;
1574	else
1575		gic_chip.flags |= IRQCHIP_SUPPORTS_NMI;
1576}
1577
1578static int __init gic_init_bases(void __iomem *dist_base,
1579				 struct redist_region *rdist_regs,
1580				 u32 nr_redist_regions,
1581				 u64 redist_stride,
1582				 struct fwnode_handle *handle)
1583{
1584	u32 typer;
1585	int err;
1586
1587	if (!is_hyp_mode_available())
1588		static_branch_disable(&supports_deactivate_key);
1589
1590	if (static_branch_likely(&supports_deactivate_key))
1591		pr_info("GIC: Using split EOI/Deactivate mode\n");
1592
1593	gic_data.fwnode = handle;
1594	gic_data.dist_base = dist_base;
1595	gic_data.redist_regions = rdist_regs;
1596	gic_data.nr_redist_regions = nr_redist_regions;
1597	gic_data.redist_stride = redist_stride;
1598
1599	/*
1600	 * Find out how many interrupts are supported.
1601	 */
1602	typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
1603	gic_data.rdists.gicd_typer = typer;
1604
1605	gic_enable_quirks(readl_relaxed(gic_data.dist_base + GICD_IIDR),
1606			  gic_quirks, &gic_data);
1607
1608	pr_info("%d SPIs implemented\n", GIC_LINE_NR - 32);
1609	pr_info("%d Extended SPIs implemented\n", GIC_ESPI_NR);
1610
1611	/*
1612	 * ThunderX1 explodes on reading GICD_TYPER2, in violation of the
1613	 * architecture spec (which says that reserved registers are RES0).
1614	 */
1615	if (!(gic_data.flags & FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539))
1616		gic_data.rdists.gicd_typer2 = readl_relaxed(gic_data.dist_base + GICD_TYPER2);
1617
1618	gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
1619						 &gic_data);
 
1620	gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
1621	gic_data.rdists.has_rvpeid = true;
1622	gic_data.rdists.has_vlpis = true;
1623	gic_data.rdists.has_direct_lpi = true;
1624	gic_data.rdists.has_vpend_valid_dirty = true;
1625
1626	if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
1627		err = -ENOMEM;
1628		goto out_free;
1629	}
1630
1631	irq_domain_update_bus_token(gic_data.domain, DOMAIN_BUS_WIRED);
1632
1633	gic_data.has_rss = !!(typer & GICD_TYPER_RSS);
1634	pr_info("Distributor has %sRange Selector support\n",
1635		gic_data.has_rss ? "" : "no ");
1636
1637	if (typer & GICD_TYPER_MBIS) {
1638		err = mbi_init(handle, gic_data.domain);
1639		if (err)
1640			pr_err("Failed to initialize MBIs\n");
1641	}
1642
1643	set_handle_irq(gic_handle_irq);
1644
1645	gic_update_rdist_properties();
1646
1647	gic_smp_init();
1648	gic_dist_init();
1649	gic_cpu_init();
1650	gic_cpu_pm_init();
1651
1652	if (gic_dist_supports_lpis()) {
1653		its_init(handle, &gic_data.rdists, gic_data.domain);
1654		its_cpu_init();
1655	} else {
1656		if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
1657			gicv2m_init(handle, gic_data.domain);
1658	}
1659
1660	gic_enable_nmi_support();
1661
1662	return 0;
1663
1664out_free:
1665	if (gic_data.domain)
1666		irq_domain_remove(gic_data.domain);
1667	free_percpu(gic_data.rdists.rdist);
1668	return err;
1669}
1670
1671static int __init gic_validate_dist_version(void __iomem *dist_base)
1672{
1673	u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1674
1675	if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4)
1676		return -ENODEV;
1677
1678	return 0;
1679}
1680
1681/* Create all possible partitions at boot time */
1682static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
1683{
1684	struct device_node *parts_node, *child_part;
1685	int part_idx = 0, i;
1686	int nr_parts;
1687	struct partition_affinity *parts;
1688
1689	parts_node = of_get_child_by_name(gic_node, "ppi-partitions");
1690	if (!parts_node)
1691		return;
1692
1693	gic_data.ppi_descs = kcalloc(gic_data.ppi_nr, sizeof(*gic_data.ppi_descs), GFP_KERNEL);
1694	if (!gic_data.ppi_descs)
1695		return;
1696
1697	nr_parts = of_get_child_count(parts_node);
1698
1699	if (!nr_parts)
1700		goto out_put_node;
1701
1702	parts = kcalloc(nr_parts, sizeof(*parts), GFP_KERNEL);
1703	if (WARN_ON(!parts))
1704		goto out_put_node;
1705
1706	for_each_child_of_node(parts_node, child_part) {
1707		struct partition_affinity *part;
1708		int n;
1709
1710		part = &parts[part_idx];
1711
1712		part->partition_id = of_node_to_fwnode(child_part);
1713
1714		pr_info("GIC: PPI partition %pOFn[%d] { ",
1715			child_part, part_idx);
1716
1717		n = of_property_count_elems_of_size(child_part, "affinity",
1718						    sizeof(u32));
1719		WARN_ON(n <= 0);
1720
1721		for (i = 0; i < n; i++) {
1722			int err, cpu;
1723			u32 cpu_phandle;
1724			struct device_node *cpu_node;
1725
1726			err = of_property_read_u32_index(child_part, "affinity",
1727							 i, &cpu_phandle);
1728			if (WARN_ON(err))
1729				continue;
1730
1731			cpu_node = of_find_node_by_phandle(cpu_phandle);
1732			if (WARN_ON(!cpu_node))
1733				continue;
1734
1735			cpu = of_cpu_node_to_id(cpu_node);
1736			if (WARN_ON(cpu < 0))
1737				continue;
1738
1739			pr_cont("%pOF[%d] ", cpu_node, cpu);
1740
1741			cpumask_set_cpu(cpu, &part->mask);
1742		}
1743
1744		pr_cont("}\n");
1745		part_idx++;
1746	}
1747
1748	for (i = 0; i < gic_data.ppi_nr; i++) {
1749		unsigned int irq;
1750		struct partition_desc *desc;
1751		struct irq_fwspec ppi_fwspec = {
1752			.fwnode		= gic_data.fwnode,
1753			.param_count	= 3,
1754			.param		= {
1755				[0]	= GIC_IRQ_TYPE_PARTITION,
1756				[1]	= i,
1757				[2]	= IRQ_TYPE_NONE,
1758			},
1759		};
1760
1761		irq = irq_create_fwspec_mapping(&ppi_fwspec);
1762		if (WARN_ON(!irq))
1763			continue;
1764		desc = partition_create_desc(gic_data.fwnode, parts, nr_parts,
1765					     irq, &partition_domain_ops);
1766		if (WARN_ON(!desc))
1767			continue;
1768
1769		gic_data.ppi_descs[i] = desc;
1770	}
1771
1772out_put_node:
1773	of_node_put(parts_node);
1774}
1775
1776static void __init gic_of_setup_kvm_info(struct device_node *node)
1777{
1778	int ret;
1779	struct resource r;
1780	u32 gicv_idx;
1781
1782	gic_v3_kvm_info.type = GIC_V3;
1783
1784	gic_v3_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1785	if (!gic_v3_kvm_info.maint_irq)
1786		return;
1787
1788	if (of_property_read_u32(node, "#redistributor-regions",
1789				 &gicv_idx))
1790		gicv_idx = 1;
1791
1792	gicv_idx += 3;	/* Also skip GICD, GICC, GICH */
1793	ret = of_address_to_resource(node, gicv_idx, &r);
1794	if (!ret)
1795		gic_v3_kvm_info.vcpu = r;
1796
1797	gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
1798	gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;
1799	gic_set_kvm_info(&gic_v3_kvm_info);
1800}
1801
1802static int __init gic_of_init(struct device_node *node, struct device_node *parent)
1803{
1804	void __iomem *dist_base;
1805	struct redist_region *rdist_regs;
1806	u64 redist_stride;
1807	u32 nr_redist_regions;
1808	int err, i;
1809
1810	dist_base = of_iomap(node, 0);
1811	if (!dist_base) {
1812		pr_err("%pOF: unable to map gic dist registers\n", node);
1813		return -ENXIO;
1814	}
1815
1816	err = gic_validate_dist_version(dist_base);
1817	if (err) {
1818		pr_err("%pOF: no distributor detected, giving up\n", node);
1819		goto out_unmap_dist;
1820	}
1821
1822	if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
1823		nr_redist_regions = 1;
1824
1825	rdist_regs = kcalloc(nr_redist_regions, sizeof(*rdist_regs),
1826			     GFP_KERNEL);
1827	if (!rdist_regs) {
1828		err = -ENOMEM;
1829		goto out_unmap_dist;
1830	}
1831
1832	for (i = 0; i < nr_redist_regions; i++) {
1833		struct resource res;
1834		int ret;
1835
1836		ret = of_address_to_resource(node, 1 + i, &res);
1837		rdist_regs[i].redist_base = of_iomap(node, 1 + i);
1838		if (ret || !rdist_regs[i].redist_base) {
1839			pr_err("%pOF: couldn't map region %d\n", node, i);
1840			err = -ENODEV;
1841			goto out_unmap_rdist;
1842		}
1843		rdist_regs[i].phys_base = res.start;
1844	}
1845
1846	if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
1847		redist_stride = 0;
1848
1849	gic_enable_of_quirks(node, gic_quirks, &gic_data);
1850
1851	err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions,
1852			     redist_stride, &node->fwnode);
1853	if (err)
1854		goto out_unmap_rdist;
1855
1856	gic_populate_ppi_partitions(node);
1857
1858	if (static_branch_likely(&supports_deactivate_key))
1859		gic_of_setup_kvm_info(node);
1860	return 0;
1861
1862out_unmap_rdist:
1863	for (i = 0; i < nr_redist_regions; i++)
1864		if (rdist_regs[i].redist_base)
1865			iounmap(rdist_regs[i].redist_base);
1866	kfree(rdist_regs);
1867out_unmap_dist:
1868	iounmap(dist_base);
1869	return err;
1870}
1871
1872IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);
1873
1874#ifdef CONFIG_ACPI
1875static struct
1876{
1877	void __iomem *dist_base;
1878	struct redist_region *redist_regs;
1879	u32 nr_redist_regions;
1880	bool single_redist;
1881	int enabled_rdists;
1882	u32 maint_irq;
1883	int maint_irq_mode;
1884	phys_addr_t vcpu_base;
1885} acpi_data __initdata;
1886
1887static void __init
1888gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base)
1889{
1890	static int count = 0;
1891
1892	acpi_data.redist_regs[count].phys_base = phys_base;
1893	acpi_data.redist_regs[count].redist_base = redist_base;
1894	acpi_data.redist_regs[count].single_redist = acpi_data.single_redist;
1895	count++;
1896}
1897
1898static int __init
1899gic_acpi_parse_madt_redist(union acpi_subtable_headers *header,
1900			   const unsigned long end)
1901{
1902	struct acpi_madt_generic_redistributor *redist =
1903			(struct acpi_madt_generic_redistributor *)header;
1904	void __iomem *redist_base;
1905
1906	redist_base = ioremap(redist->base_address, redist->length);
1907	if (!redist_base) {
1908		pr_err("Couldn't map GICR region @%llx\n", redist->base_address);
1909		return -ENOMEM;
1910	}
1911
1912	gic_acpi_register_redist(redist->base_address, redist_base);
1913	return 0;
1914}
1915
1916static int __init
1917gic_acpi_parse_madt_gicc(union acpi_subtable_headers *header,
1918			 const unsigned long end)
1919{
1920	struct acpi_madt_generic_interrupt *gicc =
1921				(struct acpi_madt_generic_interrupt *)header;
1922	u32 reg = readl_relaxed(acpi_data.dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1923	u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2;
1924	void __iomem *redist_base;
1925
1926	/* GICC entry which has !ACPI_MADT_ENABLED is not unusable so skip */
1927	if (!(gicc->flags & ACPI_MADT_ENABLED))
1928		return 0;
1929
1930	redist_base = ioremap(gicc->gicr_base_address, size);
1931	if (!redist_base)
1932		return -ENOMEM;
1933
1934	gic_acpi_register_redist(gicc->gicr_base_address, redist_base);
1935	return 0;
1936}
1937
1938static int __init gic_acpi_collect_gicr_base(void)
1939{
1940	acpi_tbl_entry_handler redist_parser;
1941	enum acpi_madt_type type;
1942
1943	if (acpi_data.single_redist) {
1944		type = ACPI_MADT_TYPE_GENERIC_INTERRUPT;
1945		redist_parser = gic_acpi_parse_madt_gicc;
1946	} else {
1947		type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR;
1948		redist_parser = gic_acpi_parse_madt_redist;
1949	}
1950
1951	/* Collect redistributor base addresses in GICR entries */
1952	if (acpi_table_parse_madt(type, redist_parser, 0) > 0)
1953		return 0;
1954
1955	pr_info("No valid GICR entries exist\n");
1956	return -ENODEV;
1957}
1958
1959static int __init gic_acpi_match_gicr(union acpi_subtable_headers *header,
1960				  const unsigned long end)
1961{
1962	/* Subtable presence means that redist exists, that's it */
1963	return 0;
1964}
1965
1966static int __init gic_acpi_match_gicc(union acpi_subtable_headers *header,
1967				      const unsigned long end)
1968{
1969	struct acpi_madt_generic_interrupt *gicc =
1970				(struct acpi_madt_generic_interrupt *)header;
1971
1972	/*
1973	 * If GICC is enabled and has valid gicr base address, then it means
1974	 * GICR base is presented via GICC
1975	 */
1976	if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) {
1977		acpi_data.enabled_rdists++;
1978		return 0;
1979	}
1980
1981	/*
1982	 * It's perfectly valid firmware can pass disabled GICC entry, driver
1983	 * should not treat as errors, skip the entry instead of probe fail.
1984	 */
1985	if (!(gicc->flags & ACPI_MADT_ENABLED))
1986		return 0;
1987
1988	return -ENODEV;
1989}
1990
1991static int __init gic_acpi_count_gicr_regions(void)
1992{
1993	int count;
1994
1995	/*
1996	 * Count how many redistributor regions we have. It is not allowed
1997	 * to mix redistributor description, GICR and GICC subtables have to be
1998	 * mutually exclusive.
1999	 */
2000	count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
2001				      gic_acpi_match_gicr, 0);
2002	if (count > 0) {
2003		acpi_data.single_redist = false;
2004		return count;
2005	}
2006
2007	count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
2008				      gic_acpi_match_gicc, 0);
2009	if (count > 0) {
2010		acpi_data.single_redist = true;
2011		count = acpi_data.enabled_rdists;
2012	}
2013
2014	return count;
2015}
2016
2017static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header,
2018					   struct acpi_probe_entry *ape)
2019{
2020	struct acpi_madt_generic_distributor *dist;
2021	int count;
2022
2023	dist = (struct acpi_madt_generic_distributor *)header;
2024	if (dist->version != ape->driver_data)
2025		return false;
2026
2027	/* We need to do that exercise anyway, the sooner the better */
2028	count = gic_acpi_count_gicr_regions();
2029	if (count <= 0)
2030		return false;
2031
2032	acpi_data.nr_redist_regions = count;
2033	return true;
2034}
2035
2036static int __init gic_acpi_parse_virt_madt_gicc(union acpi_subtable_headers *header,
2037						const unsigned long end)
2038{
2039	struct acpi_madt_generic_interrupt *gicc =
2040		(struct acpi_madt_generic_interrupt *)header;
2041	int maint_irq_mode;
2042	static int first_madt = true;
2043
2044	/* Skip unusable CPUs */
2045	if (!(gicc->flags & ACPI_MADT_ENABLED))
2046		return 0;
2047
2048	maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
2049		ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
2050
2051	if (first_madt) {
2052		first_madt = false;
2053
2054		acpi_data.maint_irq = gicc->vgic_interrupt;
2055		acpi_data.maint_irq_mode = maint_irq_mode;
2056		acpi_data.vcpu_base = gicc->gicv_base_address;
2057
2058		return 0;
2059	}
2060
2061	/*
2062	 * The maintenance interrupt and GICV should be the same for every CPU
2063	 */
2064	if ((acpi_data.maint_irq != gicc->vgic_interrupt) ||
2065	    (acpi_data.maint_irq_mode != maint_irq_mode) ||
2066	    (acpi_data.vcpu_base != gicc->gicv_base_address))
2067		return -EINVAL;
2068
2069	return 0;
2070}
2071
2072static bool __init gic_acpi_collect_virt_info(void)
2073{
2074	int count;
2075
2076	count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
2077				      gic_acpi_parse_virt_madt_gicc, 0);
2078
2079	return (count > 0);
2080}
2081
2082#define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K)
2083#define ACPI_GICV2_VCTRL_MEM_SIZE	(SZ_4K)
2084#define ACPI_GICV2_VCPU_MEM_SIZE	(SZ_8K)
2085
2086static void __init gic_acpi_setup_kvm_info(void)
2087{
2088	int irq;
2089
2090	if (!gic_acpi_collect_virt_info()) {
2091		pr_warn("Unable to get hardware information used for virtualization\n");
2092		return;
2093	}
2094
2095	gic_v3_kvm_info.type = GIC_V3;
2096
2097	irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
2098				acpi_data.maint_irq_mode,
2099				ACPI_ACTIVE_HIGH);
2100	if (irq <= 0)
2101		return;
2102
2103	gic_v3_kvm_info.maint_irq = irq;
2104
2105	if (acpi_data.vcpu_base) {
2106		struct resource *vcpu = &gic_v3_kvm_info.vcpu;
2107
2108		vcpu->flags = IORESOURCE_MEM;
2109		vcpu->start = acpi_data.vcpu_base;
2110		vcpu->end = vcpu->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
2111	}
2112
2113	gic_v3_kvm_info.has_v4 = gic_data.rdists.has_vlpis;
2114	gic_v3_kvm_info.has_v4_1 = gic_data.rdists.has_rvpeid;
2115	gic_set_kvm_info(&gic_v3_kvm_info);
2116}
2117
2118static int __init
2119gic_acpi_init(union acpi_subtable_headers *header, const unsigned long end)
2120{
2121	struct acpi_madt_generic_distributor *dist;
2122	struct fwnode_handle *domain_handle;
2123	size_t size;
2124	int i, err;
2125
2126	/* Get distributor base address */
2127	dist = (struct acpi_madt_generic_distributor *)header;
2128	acpi_data.dist_base = ioremap(dist->base_address,
2129				      ACPI_GICV3_DIST_MEM_SIZE);
2130	if (!acpi_data.dist_base) {
2131		pr_err("Unable to map GICD registers\n");
2132		return -ENOMEM;
2133	}
2134
2135	err = gic_validate_dist_version(acpi_data.dist_base);
2136	if (err) {
2137		pr_err("No distributor detected at @%p, giving up\n",
2138		       acpi_data.dist_base);
2139		goto out_dist_unmap;
2140	}
2141
2142	size = sizeof(*acpi_data.redist_regs) * acpi_data.nr_redist_regions;
2143	acpi_data.redist_regs = kzalloc(size, GFP_KERNEL);
2144	if (!acpi_data.redist_regs) {
2145		err = -ENOMEM;
2146		goto out_dist_unmap;
2147	}
2148
2149	err = gic_acpi_collect_gicr_base();
2150	if (err)
2151		goto out_redist_unmap;
2152
2153	domain_handle = irq_domain_alloc_fwnode(&dist->base_address);
2154	if (!domain_handle) {
2155		err = -ENOMEM;
2156		goto out_redist_unmap;
2157	}
2158
2159	err = gic_init_bases(acpi_data.dist_base, acpi_data.redist_regs,
2160			     acpi_data.nr_redist_regions, 0, domain_handle);
2161	if (err)
2162		goto out_fwhandle_free;
2163
2164	acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
2165
2166	if (static_branch_likely(&supports_deactivate_key))
2167		gic_acpi_setup_kvm_info();
2168
2169	return 0;
2170
2171out_fwhandle_free:
2172	irq_domain_free_fwnode(domain_handle);
2173out_redist_unmap:
2174	for (i = 0; i < acpi_data.nr_redist_regions; i++)
2175		if (acpi_data.redist_regs[i].redist_base)
2176			iounmap(acpi_data.redist_regs[i].redist_base);
2177	kfree(acpi_data.redist_regs);
2178out_dist_unmap:
2179	iounmap(acpi_data.dist_base);
2180	return err;
2181}
2182IRQCHIP_ACPI_DECLARE(gic_v3, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
2183		     acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V3,
2184		     gic_acpi_init);
2185IRQCHIP_ACPI_DECLARE(gic_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
2186		     acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V4,
2187		     gic_acpi_init);
2188IRQCHIP_ACPI_DECLARE(gic_v3_or_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
2189		     acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_NONE,
2190		     gic_acpi_init);
2191#endif