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Merge remote-tracking branch 'asoc/topic/rt5645' into asoc-next
[deliverable/linux.git] / drivers / irqchip / irq-gic-v3.c
1 /*
2 * Copyright (C) 2013, 2014 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 unsigned int irq_nr;
59 struct partition_desc *ppi_descs[16];
60 };
61
62 static struct gic_chip_data gic_data __read_mostly;
63 static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
64
65 static struct gic_kvm_info gic_v3_kvm_info;
66
67 #define gic_data_rdist() (this_cpu_ptr(gic_data.rdists.rdist))
68 #define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base)
69 #define gic_data_rdist_sgi_base() (gic_data_rdist_rd_base() + SZ_64K)
70
71 /* Our default, arbitrary priority value. Linux only uses one anyway. */
72 #define DEFAULT_PMR_VALUE 0xf0
73
74 static inline unsigned int gic_irq(struct irq_data *d)
75 {
76 return d->hwirq;
77 }
78
79 static inline int gic_irq_in_rdist(struct irq_data *d)
80 {
81 return gic_irq(d) < 32;
82 }
83
84 static inline void __iomem *gic_dist_base(struct irq_data *d)
85 {
86 if (gic_irq_in_rdist(d)) /* SGI+PPI -> SGI_base for this CPU */
87 return gic_data_rdist_sgi_base();
88
89 if (d->hwirq <= 1023) /* SPI -> dist_base */
90 return gic_data.dist_base;
91
92 return NULL;
93 }
94
95 static void gic_do_wait_for_rwp(void __iomem *base)
96 {
97 u32 count = 1000000; /* 1s! */
98
99 while (readl_relaxed(base + GICD_CTLR) & GICD_CTLR_RWP) {
100 count--;
101 if (!count) {
102 pr_err_ratelimited("RWP timeout, gone fishing\n");
103 return;
104 }
105 cpu_relax();
106 udelay(1);
107 };
108 }
109
110 /* Wait for completion of a distributor change */
111 static void gic_dist_wait_for_rwp(void)
112 {
113 gic_do_wait_for_rwp(gic_data.dist_base);
114 }
115
116 /* Wait for completion of a redistributor change */
117 static void gic_redist_wait_for_rwp(void)
118 {
119 gic_do_wait_for_rwp(gic_data_rdist_rd_base());
120 }
121
122 #ifdef CONFIG_ARM64
123 static DEFINE_STATIC_KEY_FALSE(is_cavium_thunderx);
124
125 static u64 __maybe_unused gic_read_iar(void)
126 {
127 if (static_branch_unlikely(&is_cavium_thunderx))
128 return gic_read_iar_cavium_thunderx();
129 else
130 return gic_read_iar_common();
131 }
132 #endif
133
134 static void gic_enable_redist(bool enable)
135 {
136 void __iomem *rbase;
137 u32 count = 1000000; /* 1s! */
138 u32 val;
139
140 rbase = gic_data_rdist_rd_base();
141
142 val = readl_relaxed(rbase + GICR_WAKER);
143 if (enable)
144 /* Wake up this CPU redistributor */
145 val &= ~GICR_WAKER_ProcessorSleep;
146 else
147 val |= GICR_WAKER_ProcessorSleep;
148 writel_relaxed(val, rbase + GICR_WAKER);
149
150 if (!enable) { /* Check that GICR_WAKER is writeable */
151 val = readl_relaxed(rbase + GICR_WAKER);
152 if (!(val & GICR_WAKER_ProcessorSleep))
153 return; /* No PM support in this redistributor */
154 }
155
156 while (count--) {
157 val = readl_relaxed(rbase + GICR_WAKER);
158 if (enable ^ (bool)(val & GICR_WAKER_ChildrenAsleep))
159 break;
160 cpu_relax();
161 udelay(1);
162 };
163 if (!count)
164 pr_err_ratelimited("redistributor failed to %s...\n",
165 enable ? "wakeup" : "sleep");
166 }
167
168 /*
169 * Routines to disable, enable, EOI and route interrupts
170 */
171 static int gic_peek_irq(struct irq_data *d, u32 offset)
172 {
173 u32 mask = 1 << (gic_irq(d) % 32);
174 void __iomem *base;
175
176 if (gic_irq_in_rdist(d))
177 base = gic_data_rdist_sgi_base();
178 else
179 base = gic_data.dist_base;
180
181 return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask);
182 }
183
184 static void gic_poke_irq(struct irq_data *d, u32 offset)
185 {
186 u32 mask = 1 << (gic_irq(d) % 32);
187 void (*rwp_wait)(void);
188 void __iomem *base;
189
190 if (gic_irq_in_rdist(d)) {
191 base = gic_data_rdist_sgi_base();
192 rwp_wait = gic_redist_wait_for_rwp;
193 } else {
194 base = gic_data.dist_base;
195 rwp_wait = gic_dist_wait_for_rwp;
196 }
197
198 writel_relaxed(mask, base + offset + (gic_irq(d) / 32) * 4);
199 rwp_wait();
200 }
201
202 static void gic_mask_irq(struct irq_data *d)
203 {
204 gic_poke_irq(d, GICD_ICENABLER);
205 }
206
207 static void gic_eoimode1_mask_irq(struct irq_data *d)
208 {
209 gic_mask_irq(d);
210 /*
211 * When masking a forwarded interrupt, make sure it is
212 * deactivated as well.
213 *
214 * This ensures that an interrupt that is getting
215 * disabled/masked will not get "stuck", because there is
216 * noone to deactivate it (guest is being terminated).
217 */
218 if (irqd_is_forwarded_to_vcpu(d))
219 gic_poke_irq(d, GICD_ICACTIVER);
220 }
221
222 static void gic_unmask_irq(struct irq_data *d)
223 {
224 gic_poke_irq(d, GICD_ISENABLER);
225 }
226
227 static int gic_irq_set_irqchip_state(struct irq_data *d,
228 enum irqchip_irq_state which, bool val)
229 {
230 u32 reg;
231
232 if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
233 return -EINVAL;
234
235 switch (which) {
236 case IRQCHIP_STATE_PENDING:
237 reg = val ? GICD_ISPENDR : GICD_ICPENDR;
238 break;
239
240 case IRQCHIP_STATE_ACTIVE:
241 reg = val ? GICD_ISACTIVER : GICD_ICACTIVER;
242 break;
243
244 case IRQCHIP_STATE_MASKED:
245 reg = val ? GICD_ICENABLER : GICD_ISENABLER;
246 break;
247
248 default:
249 return -EINVAL;
250 }
251
252 gic_poke_irq(d, reg);
253 return 0;
254 }
255
256 static int gic_irq_get_irqchip_state(struct irq_data *d,
257 enum irqchip_irq_state which, bool *val)
258 {
259 if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
260 return -EINVAL;
261
262 switch (which) {
263 case IRQCHIP_STATE_PENDING:
264 *val = gic_peek_irq(d, GICD_ISPENDR);
265 break;
266
267 case IRQCHIP_STATE_ACTIVE:
268 *val = gic_peek_irq(d, GICD_ISACTIVER);
269 break;
270
271 case IRQCHIP_STATE_MASKED:
272 *val = !gic_peek_irq(d, GICD_ISENABLER);
273 break;
274
275 default:
276 return -EINVAL;
277 }
278
279 return 0;
280 }
281
282 static void gic_eoi_irq(struct irq_data *d)
283 {
284 gic_write_eoir(gic_irq(d));
285 }
286
287 static void gic_eoimode1_eoi_irq(struct irq_data *d)
288 {
289 /*
290 * No need to deactivate an LPI, or an interrupt that
291 * is is getting forwarded to a vcpu.
292 */
293 if (gic_irq(d) >= 8192 || irqd_is_forwarded_to_vcpu(d))
294 return;
295 gic_write_dir(gic_irq(d));
296 }
297
298 static int gic_set_type(struct irq_data *d, unsigned int type)
299 {
300 unsigned int irq = gic_irq(d);
301 void (*rwp_wait)(void);
302 void __iomem *base;
303
304 /* Interrupt configuration for SGIs can't be changed */
305 if (irq < 16)
306 return -EINVAL;
307
308 /* SPIs have restrictions on the supported types */
309 if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
310 type != IRQ_TYPE_EDGE_RISING)
311 return -EINVAL;
312
313 if (gic_irq_in_rdist(d)) {
314 base = gic_data_rdist_sgi_base();
315 rwp_wait = gic_redist_wait_for_rwp;
316 } else {
317 base = gic_data.dist_base;
318 rwp_wait = gic_dist_wait_for_rwp;
319 }
320
321 return gic_configure_irq(irq, type, base, rwp_wait);
322 }
323
324 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
325 {
326 if (vcpu)
327 irqd_set_forwarded_to_vcpu(d);
328 else
329 irqd_clr_forwarded_to_vcpu(d);
330 return 0;
331 }
332
333 static u64 gic_mpidr_to_affinity(unsigned long mpidr)
334 {
335 u64 aff;
336
337 aff = ((u64)MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 |
338 MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
339 MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
340 MPIDR_AFFINITY_LEVEL(mpidr, 0));
341
342 return aff;
343 }
344
345 static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
346 {
347 u32 irqnr;
348
349 do {
350 irqnr = gic_read_iar();
351
352 if (likely(irqnr > 15 && irqnr < 1020) || irqnr >= 8192) {
353 int err;
354
355 if (static_key_true(&supports_deactivate))
356 gic_write_eoir(irqnr);
357
358 err = handle_domain_irq(gic_data.domain, irqnr, regs);
359 if (err) {
360 WARN_ONCE(true, "Unexpected interrupt received!\n");
361 if (static_key_true(&supports_deactivate)) {
362 if (irqnr < 8192)
363 gic_write_dir(irqnr);
364 } else {
365 gic_write_eoir(irqnr);
366 }
367 }
368 continue;
369 }
370 if (irqnr < 16) {
371 gic_write_eoir(irqnr);
372 if (static_key_true(&supports_deactivate))
373 gic_write_dir(irqnr);
374 #ifdef CONFIG_SMP
375 /*
376 * Unlike GICv2, we don't need an smp_rmb() here.
377 * The control dependency from gic_read_iar to
378 * the ISB in gic_write_eoir is enough to ensure
379 * that any shared data read by handle_IPI will
380 * be read after the ACK.
381 */
382 handle_IPI(irqnr, regs);
383 #else
384 WARN_ONCE(true, "Unexpected SGI received!\n");
385 #endif
386 continue;
387 }
388 } while (irqnr != ICC_IAR1_EL1_SPURIOUS);
389 }
390
391 static void __init gic_dist_init(void)
392 {
393 unsigned int i;
394 u64 affinity;
395 void __iomem *base = gic_data.dist_base;
396
397 /* Disable the distributor */
398 writel_relaxed(0, base + GICD_CTLR);
399 gic_dist_wait_for_rwp();
400
401 /*
402 * Configure SPIs as non-secure Group-1. This will only matter
403 * if the GIC only has a single security state. This will not
404 * do the right thing if the kernel is running in secure mode,
405 * but that's not the intended use case anyway.
406 */
407 for (i = 32; i < gic_data.irq_nr; i += 32)
408 writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
409
410 gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp);
411
412 /* Enable distributor with ARE, Group1 */
413 writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1,
414 base + GICD_CTLR);
415
416 /*
417 * Set all global interrupts to the boot CPU only. ARE must be
418 * enabled.
419 */
420 affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
421 for (i = 32; i < gic_data.irq_nr; i++)
422 gic_write_irouter(affinity, base + GICD_IROUTER + i * 8);
423 }
424
425 static int gic_populate_rdist(void)
426 {
427 unsigned long mpidr = cpu_logical_map(smp_processor_id());
428 u64 typer;
429 u32 aff;
430 int i;
431
432 /*
433 * Convert affinity to a 32bit value that can be matched to
434 * GICR_TYPER bits [63:32].
435 */
436 aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
437 MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
438 MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
439 MPIDR_AFFINITY_LEVEL(mpidr, 0));
440
441 for (i = 0; i < gic_data.nr_redist_regions; i++) {
442 void __iomem *ptr = gic_data.redist_regions[i].redist_base;
443 u32 reg;
444
445 reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
446 if (reg != GIC_PIDR2_ARCH_GICv3 &&
447 reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */
448 pr_warn("No redistributor present @%p\n", ptr);
449 break;
450 }
451
452 do {
453 typer = gic_read_typer(ptr + GICR_TYPER);
454 if ((typer >> 32) == aff) {
455 u64 offset = ptr - gic_data.redist_regions[i].redist_base;
456 gic_data_rdist_rd_base() = ptr;
457 gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset;
458 pr_info("CPU%d: found redistributor %lx region %d:%pa\n",
459 smp_processor_id(), mpidr, i,
460 &gic_data_rdist()->phys_base);
461 return 0;
462 }
463
464 if (gic_data.redist_regions[i].single_redist)
465 break;
466
467 if (gic_data.redist_stride) {
468 ptr += gic_data.redist_stride;
469 } else {
470 ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
471 if (typer & GICR_TYPER_VLPIS)
472 ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
473 }
474 } while (!(typer & GICR_TYPER_LAST));
475 }
476
477 /* We couldn't even deal with ourselves... */
478 WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n",
479 smp_processor_id(), mpidr);
480 return -ENODEV;
481 }
482
483 static void gic_cpu_sys_reg_init(void)
484 {
485 /*
486 * Need to check that the SRE bit has actually been set. If
487 * not, it means that SRE is disabled at EL2. We're going to
488 * die painfully, and there is nothing we can do about it.
489 *
490 * Kindly inform the luser.
491 */
492 if (!gic_enable_sre())
493 pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
494
495 /* Set priority mask register */
496 gic_write_pmr(DEFAULT_PMR_VALUE);
497
498 if (static_key_true(&supports_deactivate)) {
499 /* EOI drops priority only (mode 1) */
500 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop);
501 } else {
502 /* EOI deactivates interrupt too (mode 0) */
503 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
504 }
505
506 /* ... and let's hit the road... */
507 gic_write_grpen1(1);
508 }
509
510 static int gic_dist_supports_lpis(void)
511 {
512 return !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS);
513 }
514
515 static void gic_cpu_init(void)
516 {
517 void __iomem *rbase;
518
519 /* Register ourselves with the rest of the world */
520 if (gic_populate_rdist())
521 return;
522
523 gic_enable_redist(true);
524
525 rbase = gic_data_rdist_sgi_base();
526
527 /* Configure SGIs/PPIs as non-secure Group-1 */
528 writel_relaxed(~0, rbase + GICR_IGROUPR0);
529
530 gic_cpu_config(rbase, gic_redist_wait_for_rwp);
531
532 /* Give LPIs a spin */
533 if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
534 its_cpu_init();
535
536 /* initialise system registers */
537 gic_cpu_sys_reg_init();
538 }
539
540 #ifdef CONFIG_SMP
541 static int gic_secondary_init(struct notifier_block *nfb,
542 unsigned long action, void *hcpu)
543 {
544 if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
545 gic_cpu_init();
546 return NOTIFY_OK;
547 }
548
549 /*
550 * Notifier for enabling the GIC CPU interface. Set an arbitrarily high
551 * priority because the GIC needs to be up before the ARM generic timers.
552 */
553 static struct notifier_block gic_cpu_notifier = {
554 .notifier_call = gic_secondary_init,
555 .priority = 100,
556 };
557
558 static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask,
559 unsigned long cluster_id)
560 {
561 int cpu = *base_cpu;
562 unsigned long mpidr = cpu_logical_map(cpu);
563 u16 tlist = 0;
564
565 while (cpu < nr_cpu_ids) {
566 /*
567 * If we ever get a cluster of more than 16 CPUs, just
568 * scream and skip that CPU.
569 */
570 if (WARN_ON((mpidr & 0xff) >= 16))
571 goto out;
572
573 tlist |= 1 << (mpidr & 0xf);
574
575 cpu = cpumask_next(cpu, mask);
576 if (cpu >= nr_cpu_ids)
577 goto out;
578
579 mpidr = cpu_logical_map(cpu);
580
581 if (cluster_id != (mpidr & ~0xffUL)) {
582 cpu--;
583 goto out;
584 }
585 }
586 out:
587 *base_cpu = cpu;
588 return tlist;
589 }
590
591 #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
592 (MPIDR_AFFINITY_LEVEL(cluster_id, level) \
593 << ICC_SGI1R_AFFINITY_## level ##_SHIFT)
594
595 static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
596 {
597 u64 val;
598
599 val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3) |
600 MPIDR_TO_SGI_AFFINITY(cluster_id, 2) |
601 irq << ICC_SGI1R_SGI_ID_SHIFT |
602 MPIDR_TO_SGI_AFFINITY(cluster_id, 1) |
603 tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
604
605 pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
606 gic_write_sgi1r(val);
607 }
608
609 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
610 {
611 int cpu;
612
613 if (WARN_ON(irq >= 16))
614 return;
615
616 /*
617 * Ensure that stores to Normal memory are visible to the
618 * other CPUs before issuing the IPI.
619 */
620 smp_wmb();
621
622 for_each_cpu(cpu, mask) {
623 unsigned long cluster_id = cpu_logical_map(cpu) & ~0xffUL;
624 u16 tlist;
625
626 tlist = gic_compute_target_list(&cpu, mask, cluster_id);
627 gic_send_sgi(cluster_id, tlist, irq);
628 }
629
630 /* Force the above writes to ICC_SGI1R_EL1 to be executed */
631 isb();
632 }
633
634 static void gic_smp_init(void)
635 {
636 set_smp_cross_call(gic_raise_softirq);
637 register_cpu_notifier(&gic_cpu_notifier);
638 }
639
640 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
641 bool force)
642 {
643 unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
644 void __iomem *reg;
645 int enabled;
646 u64 val;
647
648 if (gic_irq_in_rdist(d))
649 return -EINVAL;
650
651 /* If interrupt was enabled, disable it first */
652 enabled = gic_peek_irq(d, GICD_ISENABLER);
653 if (enabled)
654 gic_mask_irq(d);
655
656 reg = gic_dist_base(d) + GICD_IROUTER + (gic_irq(d) * 8);
657 val = gic_mpidr_to_affinity(cpu_logical_map(cpu));
658
659 gic_write_irouter(val, reg);
660
661 /*
662 * If the interrupt was enabled, enabled it again. Otherwise,
663 * just wait for the distributor to have digested our changes.
664 */
665 if (enabled)
666 gic_unmask_irq(d);
667 else
668 gic_dist_wait_for_rwp();
669
670 return IRQ_SET_MASK_OK_DONE;
671 }
672 #else
673 #define gic_set_affinity NULL
674 #define gic_smp_init() do { } while(0)
675 #endif
676
677 #ifdef CONFIG_CPU_PM
678 static int gic_cpu_pm_notifier(struct notifier_block *self,
679 unsigned long cmd, void *v)
680 {
681 if (cmd == CPU_PM_EXIT) {
682 gic_enable_redist(true);
683 gic_cpu_sys_reg_init();
684 } else if (cmd == CPU_PM_ENTER) {
685 gic_write_grpen1(0);
686 gic_enable_redist(false);
687 }
688 return NOTIFY_OK;
689 }
690
691 static struct notifier_block gic_cpu_pm_notifier_block = {
692 .notifier_call = gic_cpu_pm_notifier,
693 };
694
695 static void gic_cpu_pm_init(void)
696 {
697 cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
698 }
699
700 #else
701 static inline void gic_cpu_pm_init(void) { }
702 #endif /* CONFIG_CPU_PM */
703
704 static struct irq_chip gic_chip = {
705 .name = "GICv3",
706 .irq_mask = gic_mask_irq,
707 .irq_unmask = gic_unmask_irq,
708 .irq_eoi = gic_eoi_irq,
709 .irq_set_type = gic_set_type,
710 .irq_set_affinity = gic_set_affinity,
711 .irq_get_irqchip_state = gic_irq_get_irqchip_state,
712 .irq_set_irqchip_state = gic_irq_set_irqchip_state,
713 .flags = IRQCHIP_SET_TYPE_MASKED,
714 };
715
716 static struct irq_chip gic_eoimode1_chip = {
717 .name = "GICv3",
718 .irq_mask = gic_eoimode1_mask_irq,
719 .irq_unmask = gic_unmask_irq,
720 .irq_eoi = gic_eoimode1_eoi_irq,
721 .irq_set_type = gic_set_type,
722 .irq_set_affinity = gic_set_affinity,
723 .irq_get_irqchip_state = gic_irq_get_irqchip_state,
724 .irq_set_irqchip_state = gic_irq_set_irqchip_state,
725 .irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity,
726 .flags = IRQCHIP_SET_TYPE_MASKED,
727 };
728
729 #define GIC_ID_NR (1U << gic_data.rdists.id_bits)
730
731 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
732 irq_hw_number_t hw)
733 {
734 struct irq_chip *chip = &gic_chip;
735
736 if (static_key_true(&supports_deactivate))
737 chip = &gic_eoimode1_chip;
738
739 /* SGIs are private to the core kernel */
740 if (hw < 16)
741 return -EPERM;
742 /* Nothing here */
743 if (hw >= gic_data.irq_nr && hw < 8192)
744 return -EPERM;
745 /* Off limits */
746 if (hw >= GIC_ID_NR)
747 return -EPERM;
748
749 /* PPIs */
750 if (hw < 32) {
751 irq_set_percpu_devid(irq);
752 irq_domain_set_info(d, irq, hw, chip, d->host_data,
753 handle_percpu_devid_irq, NULL, NULL);
754 irq_set_status_flags(irq, IRQ_NOAUTOEN);
755 }
756 /* SPIs */
757 if (hw >= 32 && hw < gic_data.irq_nr) {
758 irq_domain_set_info(d, irq, hw, chip, d->host_data,
759 handle_fasteoi_irq, NULL, NULL);
760 irq_set_probe(irq);
761 }
762 /* LPIs */
763 if (hw >= 8192 && hw < GIC_ID_NR) {
764 if (!gic_dist_supports_lpis())
765 return -EPERM;
766 irq_domain_set_info(d, irq, hw, chip, d->host_data,
767 handle_fasteoi_irq, NULL, NULL);
768 }
769
770 return 0;
771 }
772
773 static int gic_irq_domain_translate(struct irq_domain *d,
774 struct irq_fwspec *fwspec,
775 unsigned long *hwirq,
776 unsigned int *type)
777 {
778 if (is_of_node(fwspec->fwnode)) {
779 if (fwspec->param_count < 3)
780 return -EINVAL;
781
782 switch (fwspec->param[0]) {
783 case 0: /* SPI */
784 *hwirq = fwspec->param[1] + 32;
785 break;
786 case 1: /* PPI */
787 *hwirq = fwspec->param[1] + 16;
788 break;
789 case GIC_IRQ_TYPE_LPI: /* LPI */
790 *hwirq = fwspec->param[1];
791 break;
792 default:
793 return -EINVAL;
794 }
795
796 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
797 return 0;
798 }
799
800 if (is_fwnode_irqchip(fwspec->fwnode)) {
801 if(fwspec->param_count != 2)
802 return -EINVAL;
803
804 *hwirq = fwspec->param[0];
805 *type = fwspec->param[1];
806 return 0;
807 }
808
809 return -EINVAL;
810 }
811
812 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
813 unsigned int nr_irqs, void *arg)
814 {
815 int i, ret;
816 irq_hw_number_t hwirq;
817 unsigned int type = IRQ_TYPE_NONE;
818 struct irq_fwspec *fwspec = arg;
819
820 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
821 if (ret)
822 return ret;
823
824 for (i = 0; i < nr_irqs; i++)
825 gic_irq_domain_map(domain, virq + i, hwirq + i);
826
827 return 0;
828 }
829
830 static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
831 unsigned int nr_irqs)
832 {
833 int i;
834
835 for (i = 0; i < nr_irqs; i++) {
836 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
837 irq_set_handler(virq + i, NULL);
838 irq_domain_reset_irq_data(d);
839 }
840 }
841
842 static int gic_irq_domain_select(struct irq_domain *d,
843 struct irq_fwspec *fwspec,
844 enum irq_domain_bus_token bus_token)
845 {
846 /* Not for us */
847 if (fwspec->fwnode != d->fwnode)
848 return 0;
849
850 /* If this is not DT, then we have a single domain */
851 if (!is_of_node(fwspec->fwnode))
852 return 1;
853
854 /*
855 * If this is a PPI and we have a 4th (non-null) parameter,
856 * then we need to match the partition domain.
857 */
858 if (fwspec->param_count >= 4 &&
859 fwspec->param[0] == 1 && fwspec->param[3] != 0)
860 return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]);
861
862 return d == gic_data.domain;
863 }
864
865 static const struct irq_domain_ops gic_irq_domain_ops = {
866 .translate = gic_irq_domain_translate,
867 .alloc = gic_irq_domain_alloc,
868 .free = gic_irq_domain_free,
869 .select = gic_irq_domain_select,
870 };
871
872 static int partition_domain_translate(struct irq_domain *d,
873 struct irq_fwspec *fwspec,
874 unsigned long *hwirq,
875 unsigned int *type)
876 {
877 struct device_node *np;
878 int ret;
879
880 np = of_find_node_by_phandle(fwspec->param[3]);
881 if (WARN_ON(!np))
882 return -EINVAL;
883
884 ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]],
885 of_node_to_fwnode(np));
886 if (ret < 0)
887 return ret;
888
889 *hwirq = ret;
890 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
891
892 return 0;
893 }
894
895 static const struct irq_domain_ops partition_domain_ops = {
896 .translate = partition_domain_translate,
897 .select = gic_irq_domain_select,
898 };
899
900 static void gicv3_enable_quirks(void)
901 {
902 #ifdef CONFIG_ARM64
903 if (cpus_have_cap(ARM64_WORKAROUND_CAVIUM_23154))
904 static_branch_enable(&is_cavium_thunderx);
905 #endif
906 }
907
908 static int __init gic_init_bases(void __iomem *dist_base,
909 struct redist_region *rdist_regs,
910 u32 nr_redist_regions,
911 u64 redist_stride,
912 struct fwnode_handle *handle)
913 {
914 struct device_node *node;
915 u32 typer;
916 int gic_irqs;
917 int err;
918
919 if (!is_hyp_mode_available())
920 static_key_slow_dec(&supports_deactivate);
921
922 if (static_key_true(&supports_deactivate))
923 pr_info("GIC: Using split EOI/Deactivate mode\n");
924
925 gic_data.fwnode = handle;
926 gic_data.dist_base = dist_base;
927 gic_data.redist_regions = rdist_regs;
928 gic_data.nr_redist_regions = nr_redist_regions;
929 gic_data.redist_stride = redist_stride;
930
931 gicv3_enable_quirks();
932
933 /*
934 * Find out how many interrupts are supported.
935 * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
936 */
937 typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
938 gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer);
939 gic_irqs = GICD_TYPER_IRQS(typer);
940 if (gic_irqs > 1020)
941 gic_irqs = 1020;
942 gic_data.irq_nr = gic_irqs;
943
944 gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
945 &gic_data);
946 gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
947
948 if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
949 err = -ENOMEM;
950 goto out_free;
951 }
952
953 set_handle_irq(gic_handle_irq);
954
955 node = to_of_node(handle);
956 if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis() &&
957 node) /* Temp hack to prevent ITS init for ACPI */
958 its_init(node, &gic_data.rdists, gic_data.domain);
959
960 gic_smp_init();
961 gic_dist_init();
962 gic_cpu_init();
963 gic_cpu_pm_init();
964
965 return 0;
966
967 out_free:
968 if (gic_data.domain)
969 irq_domain_remove(gic_data.domain);
970 free_percpu(gic_data.rdists.rdist);
971 return err;
972 }
973
974 static int __init gic_validate_dist_version(void __iomem *dist_base)
975 {
976 u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
977
978 if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4)
979 return -ENODEV;
980
981 return 0;
982 }
983
984 static int get_cpu_number(struct device_node *dn)
985 {
986 const __be32 *cell;
987 u64 hwid;
988 int i;
989
990 cell = of_get_property(dn, "reg", NULL);
991 if (!cell)
992 return -1;
993
994 hwid = of_read_number(cell, of_n_addr_cells(dn));
995
996 /*
997 * Non affinity bits must be set to 0 in the DT
998 */
999 if (hwid & ~MPIDR_HWID_BITMASK)
1000 return -1;
1001
1002 for (i = 0; i < num_possible_cpus(); i++)
1003 if (cpu_logical_map(i) == hwid)
1004 return i;
1005
1006 return -1;
1007 }
1008
1009 /* Create all possible partitions at boot time */
1010 static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
1011 {
1012 struct device_node *parts_node, *child_part;
1013 int part_idx = 0, i;
1014 int nr_parts;
1015 struct partition_affinity *parts;
1016
1017 parts_node = of_find_node_by_name(gic_node, "ppi-partitions");
1018 if (!parts_node)
1019 return;
1020
1021 nr_parts = of_get_child_count(parts_node);
1022
1023 if (!nr_parts)
1024 return;
1025
1026 parts = kzalloc(sizeof(*parts) * nr_parts, GFP_KERNEL);
1027 if (WARN_ON(!parts))
1028 return;
1029
1030 for_each_child_of_node(parts_node, child_part) {
1031 struct partition_affinity *part;
1032 int n;
1033
1034 part = &parts[part_idx];
1035
1036 part->partition_id = of_node_to_fwnode(child_part);
1037
1038 pr_info("GIC: PPI partition %s[%d] { ",
1039 child_part->name, part_idx);
1040
1041 n = of_property_count_elems_of_size(child_part, "affinity",
1042 sizeof(u32));
1043 WARN_ON(n <= 0);
1044
1045 for (i = 0; i < n; i++) {
1046 int err, cpu;
1047 u32 cpu_phandle;
1048 struct device_node *cpu_node;
1049
1050 err = of_property_read_u32_index(child_part, "affinity",
1051 i, &cpu_phandle);
1052 if (WARN_ON(err))
1053 continue;
1054
1055 cpu_node = of_find_node_by_phandle(cpu_phandle);
1056 if (WARN_ON(!cpu_node))
1057 continue;
1058
1059 cpu = get_cpu_number(cpu_node);
1060 if (WARN_ON(cpu == -1))
1061 continue;
1062
1063 pr_cont("%s[%d] ", cpu_node->full_name, cpu);
1064
1065 cpumask_set_cpu(cpu, &part->mask);
1066 }
1067
1068 pr_cont("}\n");
1069 part_idx++;
1070 }
1071
1072 for (i = 0; i < 16; i++) {
1073 unsigned int irq;
1074 struct partition_desc *desc;
1075 struct irq_fwspec ppi_fwspec = {
1076 .fwnode = gic_data.fwnode,
1077 .param_count = 3,
1078 .param = {
1079 [0] = 1,
1080 [1] = i,
1081 [2] = IRQ_TYPE_NONE,
1082 },
1083 };
1084
1085 irq = irq_create_fwspec_mapping(&ppi_fwspec);
1086 if (WARN_ON(!irq))
1087 continue;
1088 desc = partition_create_desc(gic_data.fwnode, parts, nr_parts,
1089 irq, &partition_domain_ops);
1090 if (WARN_ON(!desc))
1091 continue;
1092
1093 gic_data.ppi_descs[i] = desc;
1094 }
1095 }
1096
1097 static void __init gic_of_setup_kvm_info(struct device_node *node)
1098 {
1099 int ret;
1100 struct resource r;
1101 u32 gicv_idx;
1102
1103 gic_v3_kvm_info.type = GIC_V3;
1104
1105 gic_v3_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1106 if (!gic_v3_kvm_info.maint_irq)
1107 return;
1108
1109 if (of_property_read_u32(node, "#redistributor-regions",
1110 &gicv_idx))
1111 gicv_idx = 1;
1112
1113 gicv_idx += 3; /* Also skip GICD, GICC, GICH */
1114 ret = of_address_to_resource(node, gicv_idx, &r);
1115 if (!ret)
1116 gic_v3_kvm_info.vcpu = r;
1117
1118 gic_set_kvm_info(&gic_v3_kvm_info);
1119 }
1120
1121 static int __init gic_of_init(struct device_node *node, struct device_node *parent)
1122 {
1123 void __iomem *dist_base;
1124 struct redist_region *rdist_regs;
1125 u64 redist_stride;
1126 u32 nr_redist_regions;
1127 int err, i;
1128
1129 dist_base = of_iomap(node, 0);
1130 if (!dist_base) {
1131 pr_err("%s: unable to map gic dist registers\n",
1132 node->full_name);
1133 return -ENXIO;
1134 }
1135
1136 err = gic_validate_dist_version(dist_base);
1137 if (err) {
1138 pr_err("%s: no distributor detected, giving up\n",
1139 node->full_name);
1140 goto out_unmap_dist;
1141 }
1142
1143 if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
1144 nr_redist_regions = 1;
1145
1146 rdist_regs = kzalloc(sizeof(*rdist_regs) * nr_redist_regions, GFP_KERNEL);
1147 if (!rdist_regs) {
1148 err = -ENOMEM;
1149 goto out_unmap_dist;
1150 }
1151
1152 for (i = 0; i < nr_redist_regions; i++) {
1153 struct resource res;
1154 int ret;
1155
1156 ret = of_address_to_resource(node, 1 + i, &res);
1157 rdist_regs[i].redist_base = of_iomap(node, 1 + i);
1158 if (ret || !rdist_regs[i].redist_base) {
1159 pr_err("%s: couldn't map region %d\n",
1160 node->full_name, i);
1161 err = -ENODEV;
1162 goto out_unmap_rdist;
1163 }
1164 rdist_regs[i].phys_base = res.start;
1165 }
1166
1167 if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
1168 redist_stride = 0;
1169
1170 err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions,
1171 redist_stride, &node->fwnode);
1172 if (err)
1173 goto out_unmap_rdist;
1174
1175 gic_populate_ppi_partitions(node);
1176 gic_of_setup_kvm_info(node);
1177 return 0;
1178
1179 out_unmap_rdist:
1180 for (i = 0; i < nr_redist_regions; i++)
1181 if (rdist_regs[i].redist_base)
1182 iounmap(rdist_regs[i].redist_base);
1183 kfree(rdist_regs);
1184 out_unmap_dist:
1185 iounmap(dist_base);
1186 return err;
1187 }
1188
1189 IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);
1190
1191 #ifdef CONFIG_ACPI
1192 static struct
1193 {
1194 void __iomem *dist_base;
1195 struct redist_region *redist_regs;
1196 u32 nr_redist_regions;
1197 bool single_redist;
1198 u32 maint_irq;
1199 int maint_irq_mode;
1200 phys_addr_t vcpu_base;
1201 } acpi_data __initdata;
1202
1203 static void __init
1204 gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base)
1205 {
1206 static int count = 0;
1207
1208 acpi_data.redist_regs[count].phys_base = phys_base;
1209 acpi_data.redist_regs[count].redist_base = redist_base;
1210 acpi_data.redist_regs[count].single_redist = acpi_data.single_redist;
1211 count++;
1212 }
1213
1214 static int __init
1215 gic_acpi_parse_madt_redist(struct acpi_subtable_header *header,
1216 const unsigned long end)
1217 {
1218 struct acpi_madt_generic_redistributor *redist =
1219 (struct acpi_madt_generic_redistributor *)header;
1220 void __iomem *redist_base;
1221
1222 redist_base = ioremap(redist->base_address, redist->length);
1223 if (!redist_base) {
1224 pr_err("Couldn't map GICR region @%llx\n", redist->base_address);
1225 return -ENOMEM;
1226 }
1227
1228 gic_acpi_register_redist(redist->base_address, redist_base);
1229 return 0;
1230 }
1231
1232 static int __init
1233 gic_acpi_parse_madt_gicc(struct acpi_subtable_header *header,
1234 const unsigned long end)
1235 {
1236 struct acpi_madt_generic_interrupt *gicc =
1237 (struct acpi_madt_generic_interrupt *)header;
1238 u32 reg = readl_relaxed(acpi_data.dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1239 u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2;
1240 void __iomem *redist_base;
1241
1242 redist_base = ioremap(gicc->gicr_base_address, size);
1243 if (!redist_base)
1244 return -ENOMEM;
1245
1246 gic_acpi_register_redist(gicc->gicr_base_address, redist_base);
1247 return 0;
1248 }
1249
1250 static int __init gic_acpi_collect_gicr_base(void)
1251 {
1252 acpi_tbl_entry_handler redist_parser;
1253 enum acpi_madt_type type;
1254
1255 if (acpi_data.single_redist) {
1256 type = ACPI_MADT_TYPE_GENERIC_INTERRUPT;
1257 redist_parser = gic_acpi_parse_madt_gicc;
1258 } else {
1259 type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR;
1260 redist_parser = gic_acpi_parse_madt_redist;
1261 }
1262
1263 /* Collect redistributor base addresses in GICR entries */
1264 if (acpi_table_parse_madt(type, redist_parser, 0) > 0)
1265 return 0;
1266
1267 pr_info("No valid GICR entries exist\n");
1268 return -ENODEV;
1269 }
1270
1271 static int __init gic_acpi_match_gicr(struct acpi_subtable_header *header,
1272 const unsigned long end)
1273 {
1274 /* Subtable presence means that redist exists, that's it */
1275 return 0;
1276 }
1277
1278 static int __init gic_acpi_match_gicc(struct acpi_subtable_header *header,
1279 const unsigned long end)
1280 {
1281 struct acpi_madt_generic_interrupt *gicc =
1282 (struct acpi_madt_generic_interrupt *)header;
1283
1284 /*
1285 * If GICC is enabled and has valid gicr base address, then it means
1286 * GICR base is presented via GICC
1287 */
1288 if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address)
1289 return 0;
1290
1291 return -ENODEV;
1292 }
1293
1294 static int __init gic_acpi_count_gicr_regions(void)
1295 {
1296 int count;
1297
1298 /*
1299 * Count how many redistributor regions we have. It is not allowed
1300 * to mix redistributor description, GICR and GICC subtables have to be
1301 * mutually exclusive.
1302 */
1303 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1304 gic_acpi_match_gicr, 0);
1305 if (count > 0) {
1306 acpi_data.single_redist = false;
1307 return count;
1308 }
1309
1310 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1311 gic_acpi_match_gicc, 0);
1312 if (count > 0)
1313 acpi_data.single_redist = true;
1314
1315 return count;
1316 }
1317
1318 static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header,
1319 struct acpi_probe_entry *ape)
1320 {
1321 struct acpi_madt_generic_distributor *dist;
1322 int count;
1323
1324 dist = (struct acpi_madt_generic_distributor *)header;
1325 if (dist->version != ape->driver_data)
1326 return false;
1327
1328 /* We need to do that exercise anyway, the sooner the better */
1329 count = gic_acpi_count_gicr_regions();
1330 if (count <= 0)
1331 return false;
1332
1333 acpi_data.nr_redist_regions = count;
1334 return true;
1335 }
1336
1337 static int __init gic_acpi_parse_virt_madt_gicc(struct acpi_subtable_header *header,
1338 const unsigned long end)
1339 {
1340 struct acpi_madt_generic_interrupt *gicc =
1341 (struct acpi_madt_generic_interrupt *)header;
1342 int maint_irq_mode;
1343 static int first_madt = true;
1344
1345 /* Skip unusable CPUs */
1346 if (!(gicc->flags & ACPI_MADT_ENABLED))
1347 return 0;
1348
1349 maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
1350 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
1351
1352 if (first_madt) {
1353 first_madt = false;
1354
1355 acpi_data.maint_irq = gicc->vgic_interrupt;
1356 acpi_data.maint_irq_mode = maint_irq_mode;
1357 acpi_data.vcpu_base = gicc->gicv_base_address;
1358
1359 return 0;
1360 }
1361
1362 /*
1363 * The maintenance interrupt and GICV should be the same for every CPU
1364 */
1365 if ((acpi_data.maint_irq != gicc->vgic_interrupt) ||
1366 (acpi_data.maint_irq_mode != maint_irq_mode) ||
1367 (acpi_data.vcpu_base != gicc->gicv_base_address))
1368 return -EINVAL;
1369
1370 return 0;
1371 }
1372
1373 static bool __init gic_acpi_collect_virt_info(void)
1374 {
1375 int count;
1376
1377 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1378 gic_acpi_parse_virt_madt_gicc, 0);
1379
1380 return (count > 0);
1381 }
1382
1383 #define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K)
1384 #define ACPI_GICV2_VCTRL_MEM_SIZE (SZ_4K)
1385 #define ACPI_GICV2_VCPU_MEM_SIZE (SZ_8K)
1386
1387 static void __init gic_acpi_setup_kvm_info(void)
1388 {
1389 int irq;
1390
1391 if (!gic_acpi_collect_virt_info()) {
1392 pr_warn("Unable to get hardware information used for virtualization\n");
1393 return;
1394 }
1395
1396 gic_v3_kvm_info.type = GIC_V3;
1397
1398 irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
1399 acpi_data.maint_irq_mode,
1400 ACPI_ACTIVE_HIGH);
1401 if (irq <= 0)
1402 return;
1403
1404 gic_v3_kvm_info.maint_irq = irq;
1405
1406 if (acpi_data.vcpu_base) {
1407 struct resource *vcpu = &gic_v3_kvm_info.vcpu;
1408
1409 vcpu->flags = IORESOURCE_MEM;
1410 vcpu->start = acpi_data.vcpu_base;
1411 vcpu->end = vcpu->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
1412 }
1413
1414 gic_set_kvm_info(&gic_v3_kvm_info);
1415 }
1416
1417 static int __init
1418 gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end)
1419 {
1420 struct acpi_madt_generic_distributor *dist;
1421 struct fwnode_handle *domain_handle;
1422 size_t size;
1423 int i, err;
1424
1425 /* Get distributor base address */
1426 dist = (struct acpi_madt_generic_distributor *)header;
1427 acpi_data.dist_base = ioremap(dist->base_address,
1428 ACPI_GICV3_DIST_MEM_SIZE);
1429 if (!acpi_data.dist_base) {
1430 pr_err("Unable to map GICD registers\n");
1431 return -ENOMEM;
1432 }
1433
1434 err = gic_validate_dist_version(acpi_data.dist_base);
1435 if (err) {
1436 pr_err("No distributor detected at @%p, giving up",
1437 acpi_data.dist_base);
1438 goto out_dist_unmap;
1439 }
1440
1441 size = sizeof(*acpi_data.redist_regs) * acpi_data.nr_redist_regions;
1442 acpi_data.redist_regs = kzalloc(size, GFP_KERNEL);
1443 if (!acpi_data.redist_regs) {
1444 err = -ENOMEM;
1445 goto out_dist_unmap;
1446 }
1447
1448 err = gic_acpi_collect_gicr_base();
1449 if (err)
1450 goto out_redist_unmap;
1451
1452 domain_handle = irq_domain_alloc_fwnode(acpi_data.dist_base);
1453 if (!domain_handle) {
1454 err = -ENOMEM;
1455 goto out_redist_unmap;
1456 }
1457
1458 err = gic_init_bases(acpi_data.dist_base, acpi_data.redist_regs,
1459 acpi_data.nr_redist_regions, 0, domain_handle);
1460 if (err)
1461 goto out_fwhandle_free;
1462
1463 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1464 gic_acpi_setup_kvm_info();
1465
1466 return 0;
1467
1468 out_fwhandle_free:
1469 irq_domain_free_fwnode(domain_handle);
1470 out_redist_unmap:
1471 for (i = 0; i < acpi_data.nr_redist_regions; i++)
1472 if (acpi_data.redist_regs[i].redist_base)
1473 iounmap(acpi_data.redist_regs[i].redist_base);
1474 kfree(acpi_data.redist_regs);
1475 out_dist_unmap:
1476 iounmap(acpi_data.dist_base);
1477 return err;
1478 }
1479 IRQCHIP_ACPI_DECLARE(gic_v3, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1480 acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V3,
1481 gic_acpi_init);
1482 IRQCHIP_ACPI_DECLARE(gic_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1483 acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V4,
1484 gic_acpi_init);
1485 IRQCHIP_ACPI_DECLARE(gic_v3_or_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1486 acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_NONE,
1487 gic_acpi_init);
1488 #endif
Linux kernel - Deliverables
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