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13#define pr_fmt(fmt) "GICv2m: " fmt
14
15#include <linux/acpi.h>
16#include <linux/dma-iommu.h>
17#include <linux/irq.h>
18#include <linux/irqdomain.h>
19#include <linux/kernel.h>
20#include <linux/pci.h>
21#include <linux/msi.h>
22#include <linux/of_address.h>
23#include <linux/of_pci.h>
24#include <linux/slab.h>
25#include <linux/spinlock.h>
26#include <linux/irqchip/arm-gic.h>
27
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30
31
32
33
34
35#define V2M_MSI_TYPER 0x008
36#define V2M_MSI_TYPER_BASE_SHIFT 16
37#define V2M_MSI_TYPER_BASE_MASK 0x3FF
38#define V2M_MSI_TYPER_NUM_MASK 0x3FF
39#define V2M_MSI_SETSPI_NS 0x040
40#define V2M_MIN_SPI 32
41#define V2M_MAX_SPI 1019
42#define V2M_MSI_IIDR 0xFCC
43
44#define V2M_MSI_TYPER_BASE_SPI(x) \
45 (((x) >> V2M_MSI_TYPER_BASE_SHIFT) & V2M_MSI_TYPER_BASE_MASK)
46
47#define V2M_MSI_TYPER_NUM_SPI(x) ((x) & V2M_MSI_TYPER_NUM_MASK)
48
49
50#define XGENE_GICV2M_MSI_IIDR 0x06000170
51
52
53#define BCM_NS2_GICV2M_MSI_IIDR 0x0000013f
54
55
56#define GICV2M_NEEDS_SPI_OFFSET 0x00000001
57#define GICV2M_GRAVITON_ADDRESS_ONLY 0x00000002
58
59static LIST_HEAD(v2m_nodes);
60static DEFINE_SPINLOCK(v2m_lock);
61
62struct v2m_data {
63 struct list_head entry;
64 struct fwnode_handle *fwnode;
65 struct resource res;
66 void __iomem *base;
67 u32 spi_start;
68 u32 nr_spis;
69 u32 spi_offset;
70 unsigned long *bm;
71 u32 flags;
72};
73
74static void gicv2m_mask_msi_irq(struct irq_data *d)
75{
76 pci_msi_mask_irq(d);
77 irq_chip_mask_parent(d);
78}
79
80static void gicv2m_unmask_msi_irq(struct irq_data *d)
81{
82 pci_msi_unmask_irq(d);
83 irq_chip_unmask_parent(d);
84}
85
86static struct irq_chip gicv2m_msi_irq_chip = {
87 .name = "MSI",
88 .irq_mask = gicv2m_mask_msi_irq,
89 .irq_unmask = gicv2m_unmask_msi_irq,
90 .irq_eoi = irq_chip_eoi_parent,
91 .irq_write_msi_msg = pci_msi_domain_write_msg,
92};
93
94static struct msi_domain_info gicv2m_msi_domain_info = {
95 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
96 MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
97 .chip = &gicv2m_msi_irq_chip,
98};
99
100static phys_addr_t gicv2m_get_msi_addr(struct v2m_data *v2m, int hwirq)
101{
102 if (v2m->flags & GICV2M_GRAVITON_ADDRESS_ONLY)
103 return v2m->res.start | ((hwirq - 32) << 3);
104 else
105 return v2m->res.start + V2M_MSI_SETSPI_NS;
106}
107
108static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
109{
110 struct v2m_data *v2m = irq_data_get_irq_chip_data(data);
111 phys_addr_t addr = gicv2m_get_msi_addr(v2m, data->hwirq);
112
113 msg->address_hi = upper_32_bits(addr);
114 msg->address_lo = lower_32_bits(addr);
115
116 if (v2m->flags & GICV2M_GRAVITON_ADDRESS_ONLY)
117 msg->data = 0;
118 else
119 msg->data = data->hwirq;
120 if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
121 msg->data -= v2m->spi_offset;
122
123 iommu_dma_compose_msi_msg(irq_data_get_msi_desc(data), msg);
124}
125
126static struct irq_chip gicv2m_irq_chip = {
127 .name = "GICv2m",
128 .irq_mask = irq_chip_mask_parent,
129 .irq_unmask = irq_chip_unmask_parent,
130 .irq_eoi = irq_chip_eoi_parent,
131 .irq_set_affinity = irq_chip_set_affinity_parent,
132 .irq_compose_msi_msg = gicv2m_compose_msi_msg,
133};
134
135static int gicv2m_irq_gic_domain_alloc(struct irq_domain *domain,
136 unsigned int virq,
137 irq_hw_number_t hwirq)
138{
139 struct irq_fwspec fwspec;
140 struct irq_data *d;
141 int err;
142
143 if (is_of_node(domain->parent->fwnode)) {
144 fwspec.fwnode = domain->parent->fwnode;
145 fwspec.param_count = 3;
146 fwspec.param[0] = 0;
147 fwspec.param[1] = hwirq - 32;
148 fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
149 } else if (is_fwnode_irqchip(domain->parent->fwnode)) {
150 fwspec.fwnode = domain->parent->fwnode;
151 fwspec.param_count = 2;
152 fwspec.param[0] = hwirq;
153 fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
154 } else {
155 return -EINVAL;
156 }
157
158 err = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
159 if (err)
160 return err;
161
162
163 d = irq_domain_get_irq_data(domain->parent, virq);
164 d->chip->irq_set_type(d, IRQ_TYPE_EDGE_RISING);
165 return 0;
166}
167
168static void gicv2m_unalloc_msi(struct v2m_data *v2m, unsigned int hwirq,
169 int nr_irqs)
170{
171 spin_lock(&v2m_lock);
172 bitmap_release_region(v2m->bm, hwirq - v2m->spi_start,
173 get_count_order(nr_irqs));
174 spin_unlock(&v2m_lock);
175}
176
177static int gicv2m_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
178 unsigned int nr_irqs, void *args)
179{
180 msi_alloc_info_t *info = args;
181 struct v2m_data *v2m = NULL, *tmp;
182 int hwirq, offset, i, err = 0;
183
184 spin_lock(&v2m_lock);
185 list_for_each_entry(tmp, &v2m_nodes, entry) {
186 offset = bitmap_find_free_region(tmp->bm, tmp->nr_spis,
187 get_count_order(nr_irqs));
188 if (offset >= 0) {
189 v2m = tmp;
190 break;
191 }
192 }
193 spin_unlock(&v2m_lock);
194
195 if (!v2m)
196 return -ENOSPC;
197
198 hwirq = v2m->spi_start + offset;
199
200 err = iommu_dma_prepare_msi(info->desc,
201 gicv2m_get_msi_addr(v2m, hwirq));
202 if (err)
203 return err;
204
205 for (i = 0; i < nr_irqs; i++) {
206 err = gicv2m_irq_gic_domain_alloc(domain, virq + i, hwirq + i);
207 if (err)
208 goto fail;
209
210 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
211 &gicv2m_irq_chip, v2m);
212 }
213
214 return 0;
215
216fail:
217 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
218 gicv2m_unalloc_msi(v2m, hwirq, nr_irqs);
219 return err;
220}
221
222static void gicv2m_irq_domain_free(struct irq_domain *domain,
223 unsigned int virq, unsigned int nr_irqs)
224{
225 struct irq_data *d = irq_domain_get_irq_data(domain, virq);
226 struct v2m_data *v2m = irq_data_get_irq_chip_data(d);
227
228 gicv2m_unalloc_msi(v2m, d->hwirq, nr_irqs);
229 irq_domain_free_irqs_parent(domain, virq, nr_irqs);
230}
231
232static const struct irq_domain_ops gicv2m_domain_ops = {
233 .alloc = gicv2m_irq_domain_alloc,
234 .free = gicv2m_irq_domain_free,
235};
236
237static bool is_msi_spi_valid(u32 base, u32 num)
238{
239 if (base < V2M_MIN_SPI) {
240 pr_err("Invalid MSI base SPI (base:%u)\n", base);
241 return false;
242 }
243
244 if ((num == 0) || (base + num > V2M_MAX_SPI)) {
245 pr_err("Number of SPIs (%u) exceed maximum (%u)\n",
246 num, V2M_MAX_SPI - V2M_MIN_SPI + 1);
247 return false;
248 }
249
250 return true;
251}
252
253static struct irq_chip gicv2m_pmsi_irq_chip = {
254 .name = "pMSI",
255};
256
257static struct msi_domain_ops gicv2m_pmsi_ops = {
258};
259
260static struct msi_domain_info gicv2m_pmsi_domain_info = {
261 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
262 .ops = &gicv2m_pmsi_ops,
263 .chip = &gicv2m_pmsi_irq_chip,
264};
265
266static void gicv2m_teardown(void)
267{
268 struct v2m_data *v2m, *tmp;
269
270 list_for_each_entry_safe(v2m, tmp, &v2m_nodes, entry) {
271 list_del(&v2m->entry);
272 bitmap_free(v2m->bm);
273 iounmap(v2m->base);
274 of_node_put(to_of_node(v2m->fwnode));
275 if (is_fwnode_irqchip(v2m->fwnode))
276 irq_domain_free_fwnode(v2m->fwnode);
277 kfree(v2m);
278 }
279}
280
281static int gicv2m_allocate_domains(struct irq_domain *parent)
282{
283 struct irq_domain *inner_domain, *pci_domain, *plat_domain;
284 struct v2m_data *v2m;
285
286 v2m = list_first_entry_or_null(&v2m_nodes, struct v2m_data, entry);
287 if (!v2m)
288 return 0;
289
290 inner_domain = irq_domain_create_tree(v2m->fwnode,
291 &gicv2m_domain_ops, v2m);
292 if (!inner_domain) {
293 pr_err("Failed to create GICv2m domain\n");
294 return -ENOMEM;
295 }
296
297 irq_domain_update_bus_token(inner_domain, DOMAIN_BUS_NEXUS);
298 inner_domain->parent = parent;
299 pci_domain = pci_msi_create_irq_domain(v2m->fwnode,
300 &gicv2m_msi_domain_info,
301 inner_domain);
302 plat_domain = platform_msi_create_irq_domain(v2m->fwnode,
303 &gicv2m_pmsi_domain_info,
304 inner_domain);
305 if (!pci_domain || !plat_domain) {
306 pr_err("Failed to create MSI domains\n");
307 if (plat_domain)
308 irq_domain_remove(plat_domain);
309 if (pci_domain)
310 irq_domain_remove(pci_domain);
311 irq_domain_remove(inner_domain);
312 return -ENOMEM;
313 }
314
315 return 0;
316}
317
318static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
319 u32 spi_start, u32 nr_spis,
320 struct resource *res, u32 flags)
321{
322 int ret;
323 struct v2m_data *v2m;
324
325 v2m = kzalloc(sizeof(struct v2m_data), GFP_KERNEL);
326 if (!v2m)
327 return -ENOMEM;
328
329 INIT_LIST_HEAD(&v2m->entry);
330 v2m->fwnode = fwnode;
331 v2m->flags = flags;
332
333 memcpy(&v2m->res, res, sizeof(struct resource));
334
335 v2m->base = ioremap(v2m->res.start, resource_size(&v2m->res));
336 if (!v2m->base) {
337 pr_err("Failed to map GICv2m resource\n");
338 ret = -ENOMEM;
339 goto err_free_v2m;
340 }
341
342 if (spi_start && nr_spis) {
343 v2m->spi_start = spi_start;
344 v2m->nr_spis = nr_spis;
345 } else {
346 u32 typer;
347
348
349 if (v2m->flags & GICV2M_GRAVITON_ADDRESS_ONLY) {
350 ret = -EINVAL;
351 goto err_iounmap;
352 }
353 typer = readl_relaxed(v2m->base + V2M_MSI_TYPER);
354
355 v2m->spi_start = V2M_MSI_TYPER_BASE_SPI(typer);
356 v2m->nr_spis = V2M_MSI_TYPER_NUM_SPI(typer);
357 }
358
359 if (!is_msi_spi_valid(v2m->spi_start, v2m->nr_spis)) {
360 ret = -EINVAL;
361 goto err_iounmap;
362 }
363
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375
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377 if (!(v2m->flags & GICV2M_GRAVITON_ADDRESS_ONLY)) {
378 switch (readl_relaxed(v2m->base + V2M_MSI_IIDR)) {
379 case XGENE_GICV2M_MSI_IIDR:
380 v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
381 v2m->spi_offset = v2m->spi_start;
382 break;
383 case BCM_NS2_GICV2M_MSI_IIDR:
384 v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
385 v2m->spi_offset = 32;
386 break;
387 }
388 }
389 v2m->bm = bitmap_zalloc(v2m->nr_spis, GFP_KERNEL);
390 if (!v2m->bm) {
391 ret = -ENOMEM;
392 goto err_iounmap;
393 }
394
395 list_add_tail(&v2m->entry, &v2m_nodes);
396
397 pr_info("range%pR, SPI[%d:%d]\n", res,
398 v2m->spi_start, (v2m->spi_start + v2m->nr_spis - 1));
399 return 0;
400
401err_iounmap:
402 iounmap(v2m->base);
403err_free_v2m:
404 kfree(v2m);
405 return ret;
406}
407
408static struct of_device_id gicv2m_device_id[] = {
409 { .compatible = "arm,gic-v2m-frame", },
410 {},
411};
412
413static int __init gicv2m_of_init(struct fwnode_handle *parent_handle,
414 struct irq_domain *parent)
415{
416 int ret = 0;
417 struct device_node *node = to_of_node(parent_handle);
418 struct device_node *child;
419
420 for (child = of_find_matching_node(node, gicv2m_device_id); child;
421 child = of_find_matching_node(child, gicv2m_device_id)) {
422 u32 spi_start = 0, nr_spis = 0;
423 struct resource res;
424
425 if (!of_find_property(child, "msi-controller", NULL))
426 continue;
427
428 ret = of_address_to_resource(child, 0, &res);
429 if (ret) {
430 pr_err("Failed to allocate v2m resource.\n");
431 break;
432 }
433
434 if (!of_property_read_u32(child, "arm,msi-base-spi",
435 &spi_start) &&
436 !of_property_read_u32(child, "arm,msi-num-spis", &nr_spis))
437 pr_info("DT overriding V2M MSI_TYPER (base:%u, num:%u)\n",
438 spi_start, nr_spis);
439
440 ret = gicv2m_init_one(&child->fwnode, spi_start, nr_spis,
441 &res, 0);
442 if (ret) {
443 of_node_put(child);
444 break;
445 }
446 }
447
448 if (!ret)
449 ret = gicv2m_allocate_domains(parent);
450 if (ret)
451 gicv2m_teardown();
452 return ret;
453}
454
455#ifdef CONFIG_ACPI
456static int acpi_num_msi;
457
458static struct fwnode_handle *gicv2m_get_fwnode(struct device *dev)
459{
460 struct v2m_data *data;
461
462 if (WARN_ON(acpi_num_msi <= 0))
463 return NULL;
464
465
466 data = list_first_entry_or_null(&v2m_nodes, struct v2m_data, entry);
467 if (!data)
468 return NULL;
469
470 return data->fwnode;
471}
472
473static bool acpi_check_amazon_graviton_quirks(void)
474{
475 static struct acpi_table_madt *madt;
476 acpi_status status;
477 bool rc = false;
478
479#define ACPI_AMZN_OEM_ID "AMAZON"
480
481 status = acpi_get_table(ACPI_SIG_MADT, 0,
482 (struct acpi_table_header **)&madt);
483
484 if (ACPI_FAILURE(status) || !madt)
485 return rc;
486 rc = !memcmp(madt->header.oem_id, ACPI_AMZN_OEM_ID, ACPI_OEM_ID_SIZE);
487 acpi_put_table((struct acpi_table_header *)madt);
488
489 return rc;
490}
491
492static int __init
493acpi_parse_madt_msi(union acpi_subtable_headers *header,
494 const unsigned long end)
495{
496 int ret;
497 struct resource res;
498 u32 spi_start = 0, nr_spis = 0;
499 struct acpi_madt_generic_msi_frame *m;
500 struct fwnode_handle *fwnode;
501 u32 flags = 0;
502
503 m = (struct acpi_madt_generic_msi_frame *)header;
504 if (BAD_MADT_ENTRY(m, end))
505 return -EINVAL;
506
507 res.start = m->base_address;
508 res.end = m->base_address + SZ_4K - 1;
509 res.flags = IORESOURCE_MEM;
510
511 if (acpi_check_amazon_graviton_quirks()) {
512 pr_info("applying Amazon Graviton quirk\n");
513 res.end = res.start + SZ_8K - 1;
514 flags |= GICV2M_GRAVITON_ADDRESS_ONLY;
515 gicv2m_msi_domain_info.flags &= ~MSI_FLAG_MULTI_PCI_MSI;
516 }
517
518 if (m->flags & ACPI_MADT_OVERRIDE_SPI_VALUES) {
519 spi_start = m->spi_base;
520 nr_spis = m->spi_count;
521
522 pr_info("ACPI overriding V2M MSI_TYPER (base:%u, num:%u)\n",
523 spi_start, nr_spis);
524 }
525
526 fwnode = irq_domain_alloc_fwnode(&res.start);
527 if (!fwnode) {
528 pr_err("Unable to allocate GICv2m domain token\n");
529 return -EINVAL;
530 }
531
532 ret = gicv2m_init_one(fwnode, spi_start, nr_spis, &res, flags);
533 if (ret)
534 irq_domain_free_fwnode(fwnode);
535
536 return ret;
537}
538
539static int __init gicv2m_acpi_init(struct irq_domain *parent)
540{
541 int ret;
542
543 if (acpi_num_msi > 0)
544 return 0;
545
546 acpi_num_msi = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_MSI_FRAME,
547 acpi_parse_madt_msi, 0);
548
549 if (acpi_num_msi <= 0)
550 goto err_out;
551
552 ret = gicv2m_allocate_domains(parent);
553 if (ret)
554 goto err_out;
555
556 pci_msi_register_fwnode_provider(&gicv2m_get_fwnode);
557
558 return 0;
559
560err_out:
561 gicv2m_teardown();
562 return -EINVAL;
563}
564#else
565static int __init gicv2m_acpi_init(struct irq_domain *parent)
566{
567 return -EINVAL;
568}
569#endif
570
571int __init gicv2m_init(struct fwnode_handle *parent_handle,
572 struct irq_domain *parent)
573{
574 if (is_of_node(parent_handle))
575 return gicv2m_of_init(parent_handle, parent);
576
577 return gicv2m_acpi_init(parent);
578}
579
