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x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / drivers / irqchip / irq-gic-v3.c
blobc132f29322cc68a13ab76785d6c7d7b77bed542b
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
124 static u64 __maybe_unused gic_read_iar(void)
125 {
126 if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_23154))
127 return gic_read_iar_cavium_thunderx();
128 else
129 return gic_read_iar_common();
130 }
131 #endif
132
133 static void gic_enable_redist(bool enable)
134 {
135 void __iomem *rbase;
136 u32 count = 1000000; /* 1s! */
137 u32 val;
138
139 rbase = gic_data_rdist_rd_base();
140
141 val = readl_relaxed(rbase + GICR_WAKER);
142 if (enable)
143 /* Wake up this CPU redistributor */
144 val &= ~GICR_WAKER_ProcessorSleep;
145 else
146 val |= GICR_WAKER_ProcessorSleep;
147 writel_relaxed(val, rbase + GICR_WAKER);
148
149 if (!enable) { /* Check that GICR_WAKER is writeable */
150 val = readl_relaxed(rbase + GICR_WAKER);
151 if (!(val & GICR_WAKER_ProcessorSleep))
152 return; /* No PM support in this redistributor */
153 }
154
155 while (--count) {
156 val = readl_relaxed(rbase + GICR_WAKER);
157 if (enable ^ (bool)(val & GICR_WAKER_ChildrenAsleep))
158 break;
159 cpu_relax();
160 udelay(1);
161 };
162 if (!count)
163 pr_err_ratelimited("redistributor failed to %s...\n",
164 enable ? "wakeup" : "sleep");
165 }
166
167 /*
168 * Routines to disable, enable, EOI and route interrupts
169 */
170 static int gic_peek_irq(struct irq_data *d, u32 offset)
171 {
172 u32 mask = 1 << (gic_irq(d) % 32);
173 void __iomem *base;
174
175 if (gic_irq_in_rdist(d))
176 base = gic_data_rdist_sgi_base();
177 else
178 base = gic_data.dist_base;
179
180 return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask);
181 }
182
183 static void gic_poke_irq(struct irq_data *d, u32 offset)
184 {
185 u32 mask = 1 << (gic_irq(d) % 32);
186 void (*rwp_wait)(void);
187 void __iomem *base;
188
189 if (gic_irq_in_rdist(d)) {
190 base = gic_data_rdist_sgi_base();
191 rwp_wait = gic_redist_wait_for_rwp;
192 } else {
193 base = gic_data.dist_base;
194 rwp_wait = gic_dist_wait_for_rwp;
195 }
196
197 writel_relaxed(mask, base + offset + (gic_irq(d) / 32) * 4);
198 rwp_wait();
199 }
200
201 static void gic_mask_irq(struct irq_data *d)
202 {
203 gic_poke_irq(d, GICD_ICENABLER);
204 }
205
206 static void gic_eoimode1_mask_irq(struct irq_data *d)
207 {
208 gic_mask_irq(d);
209 /*
210 * When masking a forwarded interrupt, make sure it is
211 * deactivated as well.
212 *
213 * This ensures that an interrupt that is getting
214 * disabled/masked will not get "stuck", because there is
215 * noone to deactivate it (guest is being terminated).
216 */
217 if (irqd_is_forwarded_to_vcpu(d))
218 gic_poke_irq(d, GICD_ICACTIVER);
219 }
220
221 static void gic_unmask_irq(struct irq_data *d)
222 {
223 gic_poke_irq(d, GICD_ISENABLER);
224 }
225
226 static int gic_irq_set_irqchip_state(struct irq_data *d,
227 enum irqchip_irq_state which, bool val)
228 {
229 u32 reg;
230
231 if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
232 return -EINVAL;
233
234 switch (which) {
235 case IRQCHIP_STATE_PENDING:
236 reg = val ? GICD_ISPENDR : GICD_ICPENDR;
237 break;
238
239 case IRQCHIP_STATE_ACTIVE:
240 reg = val ? GICD_ISACTIVER : GICD_ICACTIVER;
241 break;
242
243 case IRQCHIP_STATE_MASKED:
244 reg = val ? GICD_ICENABLER : GICD_ISENABLER;
245 break;
246
247 default:
248 return -EINVAL;
249 }
250
251 gic_poke_irq(d, reg);
252 return 0;
253 }
254
255 static int gic_irq_get_irqchip_state(struct irq_data *d,
256 enum irqchip_irq_state which, bool *val)
257 {
258 if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
259 return -EINVAL;
260
261 switch (which) {
262 case IRQCHIP_STATE_PENDING:
263 *val = gic_peek_irq(d, GICD_ISPENDR);
264 break;
265
266 case IRQCHIP_STATE_ACTIVE:
267 *val = gic_peek_irq(d, GICD_ISACTIVER);
268 break;
269
270 case IRQCHIP_STATE_MASKED:
271 *val = !gic_peek_irq(d, GICD_ISENABLER);
272 break;
273
274 default:
275 return -EINVAL;
276 }
277
278 return 0;
279 }
280
281 static void gic_eoi_irq(struct irq_data *d)
282 {
283 gic_write_eoir(gic_irq(d));
284 }
285
286 static void gic_eoimode1_eoi_irq(struct irq_data *d)
287 {
288 /*
289 * No need to deactivate an LPI, or an interrupt that
290 * is is getting forwarded to a vcpu.
291 */
292 if (gic_irq(d) >= 8192 || irqd_is_forwarded_to_vcpu(d))
293 return;
294 gic_write_dir(gic_irq(d));
295 }
296
297 static int gic_set_type(struct irq_data *d, unsigned int type)
298 {
299 unsigned int irq = gic_irq(d);
300 void (*rwp_wait)(void);
301 void __iomem *base;
302
303 /* Interrupt configuration for SGIs can't be changed */
304 if (irq < 16)
305 return -EINVAL;
306
307 /* SPIs have restrictions on the supported types */
308 if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
309 type != IRQ_TYPE_EDGE_RISING)
310 return -EINVAL;
311
312 if (gic_irq_in_rdist(d)) {
313 base = gic_data_rdist_sgi_base();
314 rwp_wait = gic_redist_wait_for_rwp;
315 } else {
316 base = gic_data.dist_base;
317 rwp_wait = gic_dist_wait_for_rwp;
318 }
319
320 return gic_configure_irq(irq, type, base, rwp_wait);
321 }
322
323 static int gic_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
324 {
325 if (vcpu)
326 irqd_set_forwarded_to_vcpu(d);
327 else
328 irqd_clr_forwarded_to_vcpu(d);
329 return 0;
330 }
331
332 static u64 gic_mpidr_to_affinity(unsigned long mpidr)
333 {
334 u64 aff;
335
336 aff = ((u64)MPIDR_AFFINITY_LEVEL(mpidr, 3) << 32 |
337 MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
338 MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
339 MPIDR_AFFINITY_LEVEL(mpidr, 0));
340
341 return aff;
342 }
343
344 static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
345 {
346 u32 irqnr;
347
348 do {
349 irqnr = gic_read_iar();
350
351 if (likely(irqnr > 15 && irqnr < 1020) || irqnr >= 8192) {
352 int err;
353
354 if (static_key_true(&supports_deactivate))
355 gic_write_eoir(irqnr);
356
357 err = handle_domain_irq(gic_data.domain, irqnr, regs);
358 if (err) {
359 WARN_ONCE(true, "Unexpected interrupt received!\n");
360 if (static_key_true(&supports_deactivate)) {
361 if (irqnr < 8192)
362 gic_write_dir(irqnr);
363 } else {
364 gic_write_eoir(irqnr);
365 }
366 }
367 continue;
368 }
369 if (irqnr < 16) {
370 gic_write_eoir(irqnr);
371 if (static_key_true(&supports_deactivate))
372 gic_write_dir(irqnr);
373 #ifdef CONFIG_SMP
374 /*
375 * Unlike GICv2, we don't need an smp_rmb() here.
376 * The control dependency from gic_read_iar to
377 * the ISB in gic_write_eoir is enough to ensure
378 * that any shared data read by handle_IPI will
379 * be read after the ACK.
380 */
381 handle_IPI(irqnr, regs);
382 #else
383 WARN_ONCE(true, "Unexpected SGI received!\n");
384 #endif
385 continue;
386 }
387 } while (irqnr != ICC_IAR1_EL1_SPURIOUS);
388 }
389
390 static void __init gic_dist_init(void)
391 {
392 unsigned int i;
393 u64 affinity;
394 void __iomem *base = gic_data.dist_base;
395
396 /* Disable the distributor */
397 writel_relaxed(0, base + GICD_CTLR);
398 gic_dist_wait_for_rwp();
399
400 /*
401 * Configure SPIs as non-secure Group-1. This will only matter
402 * if the GIC only has a single security state. This will not
403 * do the right thing if the kernel is running in secure mode,
404 * but that's not the intended use case anyway.
405 */
406 for (i = 32; i < gic_data.irq_nr; i += 32)
407 writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
408
409 gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp);
410
411 /* Enable distributor with ARE, Group1 */
412 writel_relaxed(GICD_CTLR_ARE_NS | GICD_CTLR_ENABLE_G1A | GICD_CTLR_ENABLE_G1,
413 base + GICD_CTLR);
414
415 /*
416 * Set all global interrupts to the boot CPU only. ARE must be
417 * enabled.
418 */
419 affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id()));
420 for (i = 32; i < gic_data.irq_nr; i++)
421 gic_write_irouter(affinity, base + GICD_IROUTER + i * 8);
422 }
423
424 static int gic_populate_rdist(void)
425 {
426 unsigned long mpidr = cpu_logical_map(smp_processor_id());
427 u64 typer;
428 u32 aff;
429 int i;
430
431 /*
432 * Convert affinity to a 32bit value that can be matched to
433 * GICR_TYPER bits [63:32].
434 */
435 aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
436 MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
437 MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
438 MPIDR_AFFINITY_LEVEL(mpidr, 0));
439
440 for (i = 0; i < gic_data.nr_redist_regions; i++) {
441 void __iomem *ptr = gic_data.redist_regions[i].redist_base;
442 u32 reg;
443
444 reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
445 if (reg != GIC_PIDR2_ARCH_GICv3 &&
446 reg != GIC_PIDR2_ARCH_GICv4) { /* We're in trouble... */
447 pr_warn("No redistributor present @%p\n", ptr);
448 break;
449 }
450
451 do {
452 typer = gic_read_typer(ptr + GICR_TYPER);
453 if ((typer >> 32) == aff) {
454 u64 offset = ptr - gic_data.redist_regions[i].redist_base;
455 gic_data_rdist_rd_base() = ptr;
456 gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset;
457 pr_info("CPU%d: found redistributor %lx region %d:%pa\n",
458 smp_processor_id(), mpidr, i,
459 &gic_data_rdist()->phys_base);
460 return 0;
461 }
462
463 if (gic_data.redist_regions[i].single_redist)
464 break;
465
466 if (gic_data.redist_stride) {
467 ptr += gic_data.redist_stride;
468 } else {
469 ptr += SZ_64K * 2; /* Skip RD_base + SGI_base */
470 if (typer & GICR_TYPER_VLPIS)
471 ptr += SZ_64K * 2; /* Skip VLPI_base + reserved page */
472 }
473 } while (!(typer & GICR_TYPER_LAST));
474 }
475
476 /* We couldn't even deal with ourselves... */
477 WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n",
478 smp_processor_id(), mpidr);
479 return -ENODEV;
480 }
481
482 static void gic_cpu_sys_reg_init(void)
483 {
484 /*
485 * Need to check that the SRE bit has actually been set. If
486 * not, it means that SRE is disabled at EL2. We're going to
487 * die painfully, and there is nothing we can do about it.
488 *
489 * Kindly inform the luser.
490 */
491 if (!gic_enable_sre())
492 pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
493
494 /* Set priority mask register */
495 gic_write_pmr(DEFAULT_PMR_VALUE);
496
497 /*
498 * Some firmwares hand over to the kernel with the BPR changed from
499 * its reset value (and with a value large enough to prevent
500 * any pre-emptive interrupts from working at all). Writing a zero
501 * to BPR restores is reset value.
502 */
503 gic_write_bpr1(0);
504
505 if (static_key_true(&supports_deactivate)) {
506 /* EOI drops priority only (mode 1) */
507 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop);
508 } else {
509 /* EOI deactivates interrupt too (mode 0) */
510 gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
511 }
512
513 /* ... and let's hit the road... */
514 gic_write_grpen1(1);
515 }
516
517 static int gic_dist_supports_lpis(void)
518 {
519 return !!(readl_relaxed(gic_data.dist_base + GICD_TYPER) & GICD_TYPER_LPIS);
520 }
521
522 static void gic_cpu_init(void)
523 {
524 void __iomem *rbase;
525
526 /* Register ourselves with the rest of the world */
527 if (gic_populate_rdist())
528 return;
529
530 gic_enable_redist(true);
531
532 rbase = gic_data_rdist_sgi_base();
533
534 /* Configure SGIs/PPIs as non-secure Group-1 */
535 writel_relaxed(~0, rbase + GICR_IGROUPR0);
536
537 gic_cpu_config(rbase, gic_redist_wait_for_rwp);
538
539 /* Give LPIs a spin */
540 if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
541 its_cpu_init();
542
543 /* initialise system registers */
544 gic_cpu_sys_reg_init();
545 }
546
547 #ifdef CONFIG_SMP
548
549 static int gic_starting_cpu(unsigned int cpu)
550 {
551 gic_cpu_init();
552 return 0;
553 }
554
555 static u16 gic_compute_target_list(int *base_cpu, const struct cpumask *mask,
556 unsigned long cluster_id)
557 {
558 int next_cpu, cpu = *base_cpu;
559 unsigned long mpidr = cpu_logical_map(cpu);
560 u16 tlist = 0;
561
562 while (cpu < nr_cpu_ids) {
563 /*
564 * If we ever get a cluster of more than 16 CPUs, just
565 * scream and skip that CPU.
566 */
567 if (WARN_ON((mpidr & 0xff) >= 16))
568 goto out;
569
570 tlist |= 1 << (mpidr & 0xf);
571
572 next_cpu = cpumask_next(cpu, mask);
573 if (next_cpu >= nr_cpu_ids)
574 goto out;
575 cpu = next_cpu;
576
577 mpidr = cpu_logical_map(cpu);
578
579 if (cluster_id != (mpidr & ~0xffUL)) {
580 cpu--;
581 goto out;
582 }
583 }
584 out:
585 *base_cpu = cpu;
586 return tlist;
587 }
588
589 #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
590 (MPIDR_AFFINITY_LEVEL(cluster_id, level) \
591 << ICC_SGI1R_AFFINITY_## level ##_SHIFT)
592
593 static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq)
594 {
595 u64 val;
596
597 val = (MPIDR_TO_SGI_AFFINITY(cluster_id, 3) |
598 MPIDR_TO_SGI_AFFINITY(cluster_id, 2) |
599 irq << ICC_SGI1R_SGI_ID_SHIFT |
600 MPIDR_TO_SGI_AFFINITY(cluster_id, 1) |
601 tlist << ICC_SGI1R_TARGET_LIST_SHIFT);
602
603 pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val);
604 gic_write_sgi1r(val);
605 }
606
607 static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
608 {
609 int cpu;
610
611 if (WARN_ON(irq >= 16))
612 return;
613
614 /*
615 * Ensure that stores to Normal memory are visible to the
616 * other CPUs before issuing the IPI.
617 */
618 smp_wmb();
619
620 for_each_cpu(cpu, mask) {
621 unsigned long cluster_id = cpu_logical_map(cpu) & ~0xffUL;
622 u16 tlist;
623
624 tlist = gic_compute_target_list(&cpu, mask, cluster_id);
625 gic_send_sgi(cluster_id, tlist, irq);
626 }
627
628 /* Force the above writes to ICC_SGI1R_EL1 to be executed */
629 isb();
630 }
631
632 static void gic_smp_init(void)
633 {
634 set_smp_cross_call(gic_raise_softirq);
635 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
636 "irqchip/arm/gicv3:starting",
637 gic_starting_cpu, NULL);
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 /* Check whether it's single security state view */
679 static bool gic_dist_security_disabled(void)
680 {
681 return readl_relaxed(gic_data.dist_base + GICD_CTLR) & GICD_CTLR_DS;
682 }
683
684 static int gic_cpu_pm_notifier(struct notifier_block *self,
685 unsigned long cmd, void *v)
686 {
687 if (cmd == CPU_PM_EXIT) {
688 if (gic_dist_security_disabled())
689 gic_enable_redist(true);
690 gic_cpu_sys_reg_init();
691 } else if (cmd == CPU_PM_ENTER && gic_dist_security_disabled()) {
692 gic_write_grpen1(0);
693 gic_enable_redist(false);
694 }
695 return NOTIFY_OK;
696 }
697
698 static struct notifier_block gic_cpu_pm_notifier_block = {
699 .notifier_call = gic_cpu_pm_notifier,
700 };
701
702 static void gic_cpu_pm_init(void)
703 {
704 cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
705 }
706
707 #else
708 static inline void gic_cpu_pm_init(void) { }
709 #endif /* CONFIG_CPU_PM */
710
711 static struct irq_chip gic_chip = {
712 .name = "GICv3",
713 .irq_mask = gic_mask_irq,
714 .irq_unmask = gic_unmask_irq,
715 .irq_eoi = gic_eoi_irq,
716 .irq_set_type = gic_set_type,
717 .irq_set_affinity = gic_set_affinity,
718 .irq_get_irqchip_state = gic_irq_get_irqchip_state,
719 .irq_set_irqchip_state = gic_irq_set_irqchip_state,
720 .flags = IRQCHIP_SET_TYPE_MASKED,
721 };
722
723 static struct irq_chip gic_eoimode1_chip = {
724 .name = "GICv3",
725 .irq_mask = gic_eoimode1_mask_irq,
726 .irq_unmask = gic_unmask_irq,
727 .irq_eoi = gic_eoimode1_eoi_irq,
728 .irq_set_type = gic_set_type,
729 .irq_set_affinity = gic_set_affinity,
730 .irq_get_irqchip_state = gic_irq_get_irqchip_state,
731 .irq_set_irqchip_state = gic_irq_set_irqchip_state,
732 .irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity,
733 .flags = IRQCHIP_SET_TYPE_MASKED,
734 };
735
736 #define GIC_ID_NR (1U << gic_data.rdists.id_bits)
737
738 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
739 irq_hw_number_t hw)
740 {
741 struct irq_chip *chip = &gic_chip;
742
743 if (static_key_true(&supports_deactivate))
744 chip = &gic_eoimode1_chip;
745
746 /* SGIs are private to the core kernel */
747 if (hw < 16)
748 return -EPERM;
749 /* Nothing here */
750 if (hw >= gic_data.irq_nr && hw < 8192)
751 return -EPERM;
752 /* Off limits */
753 if (hw >= GIC_ID_NR)
754 return -EPERM;
755
756 /* PPIs */
757 if (hw < 32) {
758 irq_set_percpu_devid(irq);
759 irq_domain_set_info(d, irq, hw, chip, d->host_data,
760 handle_percpu_devid_irq, NULL, NULL);
761 irq_set_status_flags(irq, IRQ_NOAUTOEN);
762 }
763 /* SPIs */
764 if (hw >= 32 && hw < gic_data.irq_nr) {
765 irq_domain_set_info(d, irq, hw, chip, d->host_data,
766 handle_fasteoi_irq, NULL, NULL);
767 irq_set_probe(irq);
768 }
769 /* LPIs */
770 if (hw >= 8192 && hw < GIC_ID_NR) {
771 if (!gic_dist_supports_lpis())
772 return -EPERM;
773 irq_domain_set_info(d, irq, hw, chip, d->host_data,
774 handle_fasteoi_irq, NULL, NULL);
775 }
776
777 return 0;
778 }
779
780 static int gic_irq_domain_translate(struct irq_domain *d,
781 struct irq_fwspec *fwspec,
782 unsigned long *hwirq,
783 unsigned int *type)
784 {
785 if (is_of_node(fwspec->fwnode)) {
786 if (fwspec->param_count < 3)
787 return -EINVAL;
788
789 switch (fwspec->param[0]) {
790 case 0: /* SPI */
791 *hwirq = fwspec->param[1] + 32;
792 break;
793 case 1: /* PPI */
794 *hwirq = fwspec->param[1] + 16;
795 break;
796 case GIC_IRQ_TYPE_LPI: /* LPI */
797 *hwirq = fwspec->param[1];
798 break;
799 default:
800 return -EINVAL;
801 }
802
803 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
804 return 0;
805 }
806
807 if (is_fwnode_irqchip(fwspec->fwnode)) {
808 if(fwspec->param_count != 2)
809 return -EINVAL;
810
811 *hwirq = fwspec->param[0];
812 *type = fwspec->param[1];
813 return 0;
814 }
815
816 return -EINVAL;
817 }
818
819 static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
820 unsigned int nr_irqs, void *arg)
821 {
822 int i, ret;
823 irq_hw_number_t hwirq;
824 unsigned int type = IRQ_TYPE_NONE;
825 struct irq_fwspec *fwspec = arg;
826
827 ret = gic_irq_domain_translate(domain, fwspec, &hwirq, &type);
828 if (ret)
829 return ret;
830
831 for (i = 0; i < nr_irqs; i++)
832 gic_irq_domain_map(domain, virq + i, hwirq + i);
833
834 return 0;
835 }
836
837 static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
838 unsigned int nr_irqs)
839 {
840 int i;
841
842 for (i = 0; i < nr_irqs; i++) {
843 struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
844 irq_set_handler(virq + i, NULL);
845 irq_domain_reset_irq_data(d);
846 }
847 }
848
849 static int gic_irq_domain_select(struct irq_domain *d,
850 struct irq_fwspec *fwspec,
851 enum irq_domain_bus_token bus_token)
852 {
853 /* Not for us */
854 if (fwspec->fwnode != d->fwnode)
855 return 0;
856
857 /* If this is not DT, then we have a single domain */
858 if (!is_of_node(fwspec->fwnode))
859 return 1;
860
861 /*
862 * If this is a PPI and we have a 4th (non-null) parameter,
863 * then we need to match the partition domain.
864 */
865 if (fwspec->param_count >= 4 &&
866 fwspec->param[0] == 1 && fwspec->param[3] != 0)
867 return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]);
868
869 return d == gic_data.domain;
870 }
871
872 static const struct irq_domain_ops gic_irq_domain_ops = {
873 .translate = gic_irq_domain_translate,
874 .alloc = gic_irq_domain_alloc,
875 .free = gic_irq_domain_free,
876 .select = gic_irq_domain_select,
877 };
878
879 static int partition_domain_translate(struct irq_domain *d,
880 struct irq_fwspec *fwspec,
881 unsigned long *hwirq,
882 unsigned int *type)
883 {
884 struct device_node *np;
885 int ret;
886
887 np = of_find_node_by_phandle(fwspec->param[3]);
888 if (WARN_ON(!np))
889 return -EINVAL;
890
891 ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]],
892 of_node_to_fwnode(np));
893 if (ret < 0)
894 return ret;
895
896 *hwirq = ret;
897 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
898
899 return 0;
900 }
901
902 static const struct irq_domain_ops partition_domain_ops = {
903 .translate = partition_domain_translate,
904 .select = gic_irq_domain_select,
905 };
906
907 static int __init gic_init_bases(void __iomem *dist_base,
908 struct redist_region *rdist_regs,
909 u32 nr_redist_regions,
910 u64 redist_stride,
911 struct fwnode_handle *handle)
912 {
913 u32 typer;
914 int gic_irqs;
915 int err;
916
917 if (!is_hyp_mode_available())
918 static_key_slow_dec(&supports_deactivate);
919
920 if (static_key_true(&supports_deactivate))
921 pr_info("GIC: Using split EOI/Deactivate mode\n");
922
923 gic_data.fwnode = handle;
924 gic_data.dist_base = dist_base;
925 gic_data.redist_regions = rdist_regs;
926 gic_data.nr_redist_regions = nr_redist_regions;
927 gic_data.redist_stride = redist_stride;
928
929 /*
930 * Find out how many interrupts are supported.
931 * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
932 */
933 typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
934 gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer);
935 gic_irqs = GICD_TYPER_IRQS(typer);
936 if (gic_irqs > 1020)
937 gic_irqs = 1020;
938 gic_data.irq_nr = gic_irqs;
939
940 gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
941 &gic_data);
942 gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
943
944 if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
945 err = -ENOMEM;
946 goto out_free;
947 }
948
949 set_handle_irq(gic_handle_irq);
950
951 if (IS_ENABLED(CONFIG_ARM_GIC_V3_ITS) && gic_dist_supports_lpis())
952 its_init(handle, &gic_data.rdists, gic_data.domain);
953
954 gic_smp_init();
955 gic_dist_init();
956 gic_cpu_init();
957 gic_cpu_pm_init();
958
959 return 0;
960
961 out_free:
962 if (gic_data.domain)
963 irq_domain_remove(gic_data.domain);
964 free_percpu(gic_data.rdists.rdist);
965 return err;
966 }
967
968 static int __init gic_validate_dist_version(void __iomem *dist_base)
969 {
970 u32 reg = readl_relaxed(dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
971
972 if (reg != GIC_PIDR2_ARCH_GICv3 && reg != GIC_PIDR2_ARCH_GICv4)
973 return -ENODEV;
974
975 return 0;
976 }
977
978 static int get_cpu_number(struct device_node *dn)
979 {
980 const __be32 *cell;
981 u64 hwid;
982 int i;
983
984 cell = of_get_property(dn, "reg", NULL);
985 if (!cell)
986 return -1;
987
988 hwid = of_read_number(cell, of_n_addr_cells(dn));
989
990 /*
991 * Non affinity bits must be set to 0 in the DT
992 */
993 if (hwid & ~MPIDR_HWID_BITMASK)
994 return -1;
995
996 for (i = 0; i < num_possible_cpus(); i++)
997 if (cpu_logical_map(i) == hwid)
998 return i;
999
1000 return -1;
1001 }
1002
1003 /* Create all possible partitions at boot time */
1004 static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
1005 {
1006 struct device_node *parts_node, *child_part;
1007 int part_idx = 0, i;
1008 int nr_parts;
1009 struct partition_affinity *parts;
1010
1011 parts_node = of_find_node_by_name(gic_node, "ppi-partitions");
1012 if (!parts_node)
1013 return;
1014
1015 nr_parts = of_get_child_count(parts_node);
1016
1017 if (!nr_parts)
1018 return;
1019
1020 parts = kzalloc(sizeof(*parts) * nr_parts, GFP_KERNEL);
1021 if (WARN_ON(!parts))
1022 return;
1023
1024 for_each_child_of_node(parts_node, child_part) {
1025 struct partition_affinity *part;
1026 int n;
1027
1028 part = &parts[part_idx];
1029
1030 part->partition_id = of_node_to_fwnode(child_part);
1031
1032 pr_info("GIC: PPI partition %s[%d] { ",
1033 child_part->name, part_idx);
1034
1035 n = of_property_count_elems_of_size(child_part, "affinity",
1036 sizeof(u32));
1037 WARN_ON(n <= 0);
1038
1039 for (i = 0; i < n; i++) {
1040 int err, cpu;
1041 u32 cpu_phandle;
1042 struct device_node *cpu_node;
1043
1044 err = of_property_read_u32_index(child_part, "affinity",
1045 i, &cpu_phandle);
1046 if (WARN_ON(err))
1047 continue;
1048
1049 cpu_node = of_find_node_by_phandle(cpu_phandle);
1050 if (WARN_ON(!cpu_node))
1051 continue;
1052
1053 cpu = get_cpu_number(cpu_node);
1054 if (WARN_ON(cpu == -1))
1055 continue;
1056
1057 pr_cont("%s[%d] ", cpu_node->full_name, cpu);
1058
1059 cpumask_set_cpu(cpu, &part->mask);
1060 }
1061
1062 pr_cont("}\n");
1063 part_idx++;
1064 }
1065
1066 for (i = 0; i < 16; i++) {
1067 unsigned int irq;
1068 struct partition_desc *desc;
1069 struct irq_fwspec ppi_fwspec = {
1070 .fwnode = gic_data.fwnode,
1071 .param_count = 3,
1072 .param = {
1073 [0] = 1,
1074 [1] = i,
1075 [2] = IRQ_TYPE_NONE,
1076 },
1077 };
1078
1079 irq = irq_create_fwspec_mapping(&ppi_fwspec);
1080 if (WARN_ON(!irq))
1081 continue;
1082 desc = partition_create_desc(gic_data.fwnode, parts, nr_parts,
1083 irq, &partition_domain_ops);
1084 if (WARN_ON(!desc))
1085 continue;
1086
1087 gic_data.ppi_descs[i] = desc;
1088 }
1089 }
1090
1091 static void __init gic_of_setup_kvm_info(struct device_node *node)
1092 {
1093 int ret;
1094 struct resource r;
1095 u32 gicv_idx;
1096
1097 gic_v3_kvm_info.type = GIC_V3;
1098
1099 gic_v3_kvm_info.maint_irq = irq_of_parse_and_map(node, 0);
1100 if (!gic_v3_kvm_info.maint_irq)
1101 return;
1102
1103 if (of_property_read_u32(node, "#redistributor-regions",
1104 &gicv_idx))
1105 gicv_idx = 1;
1106
1107 gicv_idx += 3; /* Also skip GICD, GICC, GICH */
1108 ret = of_address_to_resource(node, gicv_idx, &r);
1109 if (!ret)
1110 gic_v3_kvm_info.vcpu = r;
1111
1112 gic_set_kvm_info(&gic_v3_kvm_info);
1113 }
1114
1115 static int __init gic_of_init(struct device_node *node, struct device_node *parent)
1116 {
1117 void __iomem *dist_base;
1118 struct redist_region *rdist_regs;
1119 u64 redist_stride;
1120 u32 nr_redist_regions;
1121 int err, i;
1122
1123 dist_base = of_iomap(node, 0);
1124 if (!dist_base) {
1125 pr_err("%s: unable to map gic dist registers\n",
1126 node->full_name);
1127 return -ENXIO;
1128 }
1129
1130 err = gic_validate_dist_version(dist_base);
1131 if (err) {
1132 pr_err("%s: no distributor detected, giving up\n",
1133 node->full_name);
1134 goto out_unmap_dist;
1135 }
1136
1137 if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
1138 nr_redist_regions = 1;
1139
1140 rdist_regs = kzalloc(sizeof(*rdist_regs) * nr_redist_regions, GFP_KERNEL);
1141 if (!rdist_regs) {
1142 err = -ENOMEM;
1143 goto out_unmap_dist;
1144 }
1145
1146 for (i = 0; i < nr_redist_regions; i++) {
1147 struct resource res;
1148 int ret;
1149
1150 ret = of_address_to_resource(node, 1 + i, &res);
1151 rdist_regs[i].redist_base = of_iomap(node, 1 + i);
1152 if (ret || !rdist_regs[i].redist_base) {
1153 pr_err("%s: couldn't map region %d\n",
1154 node->full_name, i);
1155 err = -ENODEV;
1156 goto out_unmap_rdist;
1157 }
1158 rdist_regs[i].phys_base = res.start;
1159 }
1160
1161 if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
1162 redist_stride = 0;
1163
1164 err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions,
1165 redist_stride, &node->fwnode);
1166 if (err)
1167 goto out_unmap_rdist;
1168
1169 gic_populate_ppi_partitions(node);
1170 gic_of_setup_kvm_info(node);
1171 return 0;
1172
1173 out_unmap_rdist:
1174 for (i = 0; i < nr_redist_regions; i++)
1175 if (rdist_regs[i].redist_base)
1176 iounmap(rdist_regs[i].redist_base);
1177 kfree(rdist_regs);
1178 out_unmap_dist:
1179 iounmap(dist_base);
1180 return err;
1181 }
1182
1183 IRQCHIP_DECLARE(gic_v3, "arm,gic-v3", gic_of_init);
1184
1185 #ifdef CONFIG_ACPI
1186 static struct
1187 {
1188 void __iomem *dist_base;
1189 struct redist_region *redist_regs;
1190 u32 nr_redist_regions;
1191 bool single_redist;
1192 u32 maint_irq;
1193 int maint_irq_mode;
1194 phys_addr_t vcpu_base;
1195 } acpi_data __initdata;
1196
1197 static void __init
1198 gic_acpi_register_redist(phys_addr_t phys_base, void __iomem *redist_base)
1199 {
1200 static int count = 0;
1201
1202 acpi_data.redist_regs[count].phys_base = phys_base;
1203 acpi_data.redist_regs[count].redist_base = redist_base;
1204 acpi_data.redist_regs[count].single_redist = acpi_data.single_redist;
1205 count++;
1206 }
1207
1208 static int __init
1209 gic_acpi_parse_madt_redist(struct acpi_subtable_header *header,
1210 const unsigned long end)
1211 {
1212 struct acpi_madt_generic_redistributor *redist =
1213 (struct acpi_madt_generic_redistributor *)header;
1214 void __iomem *redist_base;
1215
1216 redist_base = ioremap(redist->base_address, redist->length);
1217 if (!redist_base) {
1218 pr_err("Couldn't map GICR region @%llx\n", redist->base_address);
1219 return -ENOMEM;
1220 }
1221
1222 gic_acpi_register_redist(redist->base_address, redist_base);
1223 return 0;
1224 }
1225
1226 static int __init
1227 gic_acpi_parse_madt_gicc(struct acpi_subtable_header *header,
1228 const unsigned long end)
1229 {
1230 struct acpi_madt_generic_interrupt *gicc =
1231 (struct acpi_madt_generic_interrupt *)header;
1232 u32 reg = readl_relaxed(acpi_data.dist_base + GICD_PIDR2) & GIC_PIDR2_ARCH_MASK;
1233 u32 size = reg == GIC_PIDR2_ARCH_GICv4 ? SZ_64K * 4 : SZ_64K * 2;
1234 void __iomem *redist_base;
1235
1236 redist_base = ioremap(gicc->gicr_base_address, size);
1237 if (!redist_base)
1238 return -ENOMEM;
1239
1240 gic_acpi_register_redist(gicc->gicr_base_address, redist_base);
1241 return 0;
1242 }
1243
1244 static int __init gic_acpi_collect_gicr_base(void)
1245 {
1246 acpi_tbl_entry_handler redist_parser;
1247 enum acpi_madt_type type;
1248
1249 if (acpi_data.single_redist) {
1250 type = ACPI_MADT_TYPE_GENERIC_INTERRUPT;
1251 redist_parser = gic_acpi_parse_madt_gicc;
1252 } else {
1253 type = ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR;
1254 redist_parser = gic_acpi_parse_madt_redist;
1255 }
1256
1257 /* Collect redistributor base addresses in GICR entries */
1258 if (acpi_table_parse_madt(type, redist_parser, 0) > 0)
1259 return 0;
1260
1261 pr_info("No valid GICR entries exist\n");
1262 return -ENODEV;
1263 }
1264
1265 static int __init gic_acpi_match_gicr(struct acpi_subtable_header *header,
1266 const unsigned long end)
1267 {
1268 /* Subtable presence means that redist exists, that's it */
1269 return 0;
1270 }
1271
1272 static int __init gic_acpi_match_gicc(struct acpi_subtable_header *header,
1273 const unsigned long end)
1274 {
1275 struct acpi_madt_generic_interrupt *gicc =
1276 (struct acpi_madt_generic_interrupt *)header;
1277
1278 /*
1279 * If GICC is enabled and has valid gicr base address, then it means
1280 * GICR base is presented via GICC
1281 */
1282 if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address)
1283 return 0;
1284
1285 return -ENODEV;
1286 }
1287
1288 static int __init gic_acpi_count_gicr_regions(void)
1289 {
1290 int count;
1291
1292 /*
1293 * Count how many redistributor regions we have. It is not allowed
1294 * to mix redistributor description, GICR and GICC subtables have to be
1295 * mutually exclusive.
1296 */
1297 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
1298 gic_acpi_match_gicr, 0);
1299 if (count > 0) {
1300 acpi_data.single_redist = false;
1301 return count;
1302 }
1303
1304 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1305 gic_acpi_match_gicc, 0);
1306 if (count > 0)
1307 acpi_data.single_redist = true;
1308
1309 return count;
1310 }
1311
1312 static bool __init acpi_validate_gic_table(struct acpi_subtable_header *header,
1313 struct acpi_probe_entry *ape)
1314 {
1315 struct acpi_madt_generic_distributor *dist;
1316 int count;
1317
1318 dist = (struct acpi_madt_generic_distributor *)header;
1319 if (dist->version != ape->driver_data)
1320 return false;
1321
1322 /* We need to do that exercise anyway, the sooner the better */
1323 count = gic_acpi_count_gicr_regions();
1324 if (count <= 0)
1325 return false;
1326
1327 acpi_data.nr_redist_regions = count;
1328 return true;
1329 }
1330
1331 static int __init gic_acpi_parse_virt_madt_gicc(struct acpi_subtable_header *header,
1332 const unsigned long end)
1333 {
1334 struct acpi_madt_generic_interrupt *gicc =
1335 (struct acpi_madt_generic_interrupt *)header;
1336 int maint_irq_mode;
1337 static int first_madt = true;
1338
1339 /* Skip unusable CPUs */
1340 if (!(gicc->flags & ACPI_MADT_ENABLED))
1341 return 0;
1342
1343 maint_irq_mode = (gicc->flags & ACPI_MADT_VGIC_IRQ_MODE) ?
1344 ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
1345
1346 if (first_madt) {
1347 first_madt = false;
1348
1349 acpi_data.maint_irq = gicc->vgic_interrupt;
1350 acpi_data.maint_irq_mode = maint_irq_mode;
1351 acpi_data.vcpu_base = gicc->gicv_base_address;
1352
1353 return 0;
1354 }
1355
1356 /*
1357 * The maintenance interrupt and GICV should be the same for every CPU
1358 */
1359 if ((acpi_data.maint_irq != gicc->vgic_interrupt) ||
1360 (acpi_data.maint_irq_mode != maint_irq_mode) ||
1361 (acpi_data.vcpu_base != gicc->gicv_base_address))
1362 return -EINVAL;
1363
1364 return 0;
1365 }
1366
1367 static bool __init gic_acpi_collect_virt_info(void)
1368 {
1369 int count;
1370
1371 count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
1372 gic_acpi_parse_virt_madt_gicc, 0);
1373
1374 return (count > 0);
1375 }
1376
1377 #define ACPI_GICV3_DIST_MEM_SIZE (SZ_64K)
1378 #define ACPI_GICV2_VCTRL_MEM_SIZE (SZ_4K)
1379 #define ACPI_GICV2_VCPU_MEM_SIZE (SZ_8K)
1380
1381 static void __init gic_acpi_setup_kvm_info(void)
1382 {
1383 int irq;
1384
1385 if (!gic_acpi_collect_virt_info()) {
1386 pr_warn("Unable to get hardware information used for virtualization\n");
1387 return;
1388 }
1389
1390 gic_v3_kvm_info.type = GIC_V3;
1391
1392 irq = acpi_register_gsi(NULL, acpi_data.maint_irq,
1393 acpi_data.maint_irq_mode,
1394 ACPI_ACTIVE_HIGH);
1395 if (irq <= 0)
1396 return;
1397
1398 gic_v3_kvm_info.maint_irq = irq;
1399
1400 if (acpi_data.vcpu_base) {
1401 struct resource *vcpu = &gic_v3_kvm_info.vcpu;
1402
1403 vcpu->flags = IORESOURCE_MEM;
1404 vcpu->start = acpi_data.vcpu_base;
1405 vcpu->end = vcpu->start + ACPI_GICV2_VCPU_MEM_SIZE - 1;
1406 }
1407
1408 gic_set_kvm_info(&gic_v3_kvm_info);
1409 }
1410
1411 static int __init
1412 gic_acpi_init(struct acpi_subtable_header *header, const unsigned long end)
1413 {
1414 struct acpi_madt_generic_distributor *dist;
1415 struct fwnode_handle *domain_handle;
1416 size_t size;
1417 int i, err;
1418
1419 /* Get distributor base address */
1420 dist = (struct acpi_madt_generic_distributor *)header;
1421 acpi_data.dist_base = ioremap(dist->base_address,
1422 ACPI_GICV3_DIST_MEM_SIZE);
1423 if (!acpi_data.dist_base) {
1424 pr_err("Unable to map GICD registers\n");
1425 return -ENOMEM;
1426 }
1427
1428 err = gic_validate_dist_version(acpi_data.dist_base);
1429 if (err) {
1430 pr_err("No distributor detected at @%p, giving up",
1431 acpi_data.dist_base);
1432 goto out_dist_unmap;
1433 }
1434
1435 size = sizeof(*acpi_data.redist_regs) * acpi_data.nr_redist_regions;
1436 acpi_data.redist_regs = kzalloc(size, GFP_KERNEL);
1437 if (!acpi_data.redist_regs) {
1438 err = -ENOMEM;
1439 goto out_dist_unmap;
1440 }
1441
1442 err = gic_acpi_collect_gicr_base();
1443 if (err)
1444 goto out_redist_unmap;
1445
1446 domain_handle = irq_domain_alloc_fwnode(acpi_data.dist_base);
1447 if (!domain_handle) {
1448 err = -ENOMEM;
1449 goto out_redist_unmap;
1450 }
1451
1452 err = gic_init_bases(acpi_data.dist_base, acpi_data.redist_regs,
1453 acpi_data.nr_redist_regions, 0, domain_handle);
1454 if (err)
1455 goto out_fwhandle_free;
1456
1457 acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
1458 gic_acpi_setup_kvm_info();
1459
1460 return 0;
1461
1462 out_fwhandle_free:
1463 irq_domain_free_fwnode(domain_handle);
1464 out_redist_unmap:
1465 for (i = 0; i < acpi_data.nr_redist_regions; i++)
1466 if (acpi_data.redist_regs[i].redist_base)
1467 iounmap(acpi_data.redist_regs[i].redist_base);
1468 kfree(acpi_data.redist_regs);
1469 out_dist_unmap:
1470 iounmap(acpi_data.dist_base);
1471 return err;
1472 }
1473 IRQCHIP_ACPI_DECLARE(gic_v3, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1474 acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V3,
1475 gic_acpi_init);
1476 IRQCHIP_ACPI_DECLARE(gic_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1477 acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_V4,
1478 gic_acpi_init);
1479 IRQCHIP_ACPI_DECLARE(gic_v3_or_v4, ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR,
1480 acpi_validate_gic_table, ACPI_MADT_GIC_VERSION_NONE,
1481 gic_acpi_init);
1482 #endif
Linux with added FPC-III support