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14#include <linux/pci.h>
15#include <linux/init.h>
16#include <linux/sfi_acpi.h>
17#include <linux/bitmap.h>
18#include <linux/dmi.h>
19#include <linux/slab.h>
20#include <linux/mutex.h>
21#include <linux/rculist.h>
22#include <asm/e820/api.h>
23#include <asm/pci_x86.h>
24#include <asm/acpi.h>
25
26#define PREFIX "PCI: "
27
28
29static bool pci_mmcfg_running_state;
30static bool pci_mmcfg_arch_init_failed;
31static DEFINE_MUTEX(pci_mmcfg_lock);
32
33LIST_HEAD(pci_mmcfg_list);
34
35static void __init pci_mmconfig_remove(struct pci_mmcfg_region *cfg)
36{
37 if (cfg->res.parent)
38 release_resource(&cfg->res);
39 list_del(&cfg->list);
40 kfree(cfg);
41}
42
43static void __init free_all_mmcfg(void)
44{
45 struct pci_mmcfg_region *cfg, *tmp;
46
47 pci_mmcfg_arch_free();
48 list_for_each_entry_safe(cfg, tmp, &pci_mmcfg_list, list)
49 pci_mmconfig_remove(cfg);
50}
51
52static void list_add_sorted(struct pci_mmcfg_region *new)
53{
54 struct pci_mmcfg_region *cfg;
55
56
57 list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) {
58 if (cfg->segment > new->segment ||
59 (cfg->segment == new->segment &&
60 cfg->start_bus >= new->start_bus)) {
61 list_add_tail_rcu(&new->list, &cfg->list);
62 return;
63 }
64 }
65 list_add_tail_rcu(&new->list, &pci_mmcfg_list);
66}
67
68static struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
69 int end, u64 addr)
70{
71 struct pci_mmcfg_region *new;
72 struct resource *res;
73
74 if (addr == 0)
75 return NULL;
76
77 new = kzalloc(sizeof(*new), GFP_KERNEL);
78 if (!new)
79 return NULL;
80
81 new->address = addr;
82 new->segment = segment;
83 new->start_bus = start;
84 new->end_bus = end;
85
86 res = &new->res;
87 res->start = addr + PCI_MMCFG_BUS_OFFSET(start);
88 res->end = addr + PCI_MMCFG_BUS_OFFSET(end + 1) - 1;
89 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
90 snprintf(new->name, PCI_MMCFG_RESOURCE_NAME_LEN,
91 "PCI MMCONFIG %04x [bus %02x-%02x]", segment, start, end);
92 res->name = new->name;
93
94 return new;
95}
96
97struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
98 int end, u64 addr)
99{
100 struct pci_mmcfg_region *new;
101
102 new = pci_mmconfig_alloc(segment, start, end, addr);
103 if (new) {
104 mutex_lock(&pci_mmcfg_lock);
105 list_add_sorted(new);
106 mutex_unlock(&pci_mmcfg_lock);
107
108 pr_info(PREFIX
109 "MMCONFIG for domain %04x [bus %02x-%02x] at %pR "
110 "(base %#lx)\n",
111 segment, start, end, &new->res, (unsigned long)addr);
112 }
113
114 return new;
115}
116
117struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus)
118{
119 struct pci_mmcfg_region *cfg;
120
121 list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
122 if (cfg->segment == segment &&
123 cfg->start_bus <= bus && bus <= cfg->end_bus)
124 return cfg;
125
126 return NULL;
127}
128
129static const char *__init pci_mmcfg_e7520(void)
130{
131 u32 win;
132 raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0xce, 2, &win);
133
134 win = win & 0xf000;
135 if (win == 0x0000 || win == 0xf000)
136 return NULL;
137
138 if (pci_mmconfig_add(0, 0, 255, win << 16) == NULL)
139 return NULL;
140
141 return "Intel Corporation E7520 Memory Controller Hub";
142}
143
144static const char *__init pci_mmcfg_intel_945(void)
145{
146 u32 pciexbar, mask = 0, len = 0;
147
148 raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0x48, 4, &pciexbar);
149
150
151 if (!(pciexbar & 1))
152 return NULL;
153
154
155 switch ((pciexbar >> 1) & 3) {
156 case 0:
157 mask = 0xf0000000U;
158 len = 0x10000000U;
159 break;
160 case 1:
161 mask = 0xf8000000U;
162 len = 0x08000000U;
163 break;
164 case 2:
165 mask = 0xfc000000U;
166 len = 0x04000000U;
167 break;
168 default:
169 return NULL;
170 }
171
172
173
174
175 if ((pciexbar & mask) & 0x0fffffffU)
176 return NULL;
177
178
179 if ((pciexbar & mask) >= 0xf0000000U)
180 return NULL;
181
182 if (pci_mmconfig_add(0, 0, (len >> 20) - 1, pciexbar & mask) == NULL)
183 return NULL;
184
185 return "Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub";
186}
187
188static const char *__init pci_mmcfg_amd_fam10h(void)
189{
190 u32 low, high, address;
191 u64 base, msr;
192 int i;
193 unsigned segnbits = 0, busnbits, end_bus;
194
195 if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF))
196 return NULL;
197
198 address = MSR_FAM10H_MMIO_CONF_BASE;
199 if (rdmsr_safe(address, &low, &high))
200 return NULL;
201
202 msr = high;
203 msr <<= 32;
204 msr |= low;
205
206
207 if (!(msr & FAM10H_MMIO_CONF_ENABLE))
208 return NULL;
209
210 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
211
212 busnbits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
213 FAM10H_MMIO_CONF_BUSRANGE_MASK;
214
215
216
217
218
219 if (!busnbits)
220 return NULL;
221
222 if (busnbits > 8) {
223 segnbits = busnbits - 8;
224 busnbits = 8;
225 }
226
227 end_bus = (1 << busnbits) - 1;
228 for (i = 0; i < (1 << segnbits); i++)
229 if (pci_mmconfig_add(i, 0, end_bus,
230 base + (1<<28) * i) == NULL) {
231 free_all_mmcfg();
232 return NULL;
233 }
234
235 return "AMD Family 10h NB";
236}
237
238static bool __initdata mcp55_checked;
239static const char *__init pci_mmcfg_nvidia_mcp55(void)
240{
241 int bus;
242 int mcp55_mmconf_found = 0;
243
244 static const u32 extcfg_regnum __initconst = 0x90;
245 static const u32 extcfg_regsize __initconst = 4;
246 static const u32 extcfg_enable_mask __initconst = 1 << 31;
247 static const u32 extcfg_start_mask __initconst = 0xff << 16;
248 static const int extcfg_start_shift __initconst = 16;
249 static const u32 extcfg_size_mask __initconst = 0x3 << 28;
250 static const int extcfg_size_shift __initconst = 28;
251 static const int extcfg_sizebus[] __initconst = {
252 0x100, 0x80, 0x40, 0x20
253 };
254 static const u32 extcfg_base_mask[] __initconst = {
255 0x7ff8, 0x7ffc, 0x7ffe, 0x7fff
256 };
257 static const int extcfg_base_lshift __initconst = 25;
258
259
260
261
262 if (!acpi_disabled || !list_empty(&pci_mmcfg_list) || mcp55_checked)
263 return NULL;
264
265 mcp55_checked = true;
266 for (bus = 0; bus < 256; bus++) {
267 u64 base;
268 u32 l, extcfg;
269 u16 vendor, device;
270 int start, size_index, end;
271
272 raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), 0, 4, &l);
273 vendor = l & 0xffff;
274 device = (l >> 16) & 0xffff;
275
276 if (PCI_VENDOR_ID_NVIDIA != vendor || 0x0369 != device)
277 continue;
278
279 raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), extcfg_regnum,
280 extcfg_regsize, &extcfg);
281
282 if (!(extcfg & extcfg_enable_mask))
283 continue;
284
285 size_index = (extcfg & extcfg_size_mask) >> extcfg_size_shift;
286 base = extcfg & extcfg_base_mask[size_index];
287
288 base <<= extcfg_base_lshift;
289 start = (extcfg & extcfg_start_mask) >> extcfg_start_shift;
290 end = start + extcfg_sizebus[size_index] - 1;
291 if (pci_mmconfig_add(0, start, end, base) == NULL)
292 continue;
293 mcp55_mmconf_found++;
294 }
295
296 if (!mcp55_mmconf_found)
297 return NULL;
298
299 return "nVidia MCP55";
300}
301
302struct pci_mmcfg_hostbridge_probe {
303 u32 bus;
304 u32 devfn;
305 u32 vendor;
306 u32 device;
307 const char *(*probe)(void);
308};
309
310static const struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] __initconst = {
311 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL,
312 PCI_DEVICE_ID_INTEL_E7520_MCH, pci_mmcfg_e7520 },
313 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL,
314 PCI_DEVICE_ID_INTEL_82945G_HB, pci_mmcfg_intel_945 },
315 { 0, PCI_DEVFN(0x18, 0), PCI_VENDOR_ID_AMD,
316 0x1200, pci_mmcfg_amd_fam10h },
317 { 0xff, PCI_DEVFN(0, 0), PCI_VENDOR_ID_AMD,
318 0x1200, pci_mmcfg_amd_fam10h },
319 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_NVIDIA,
320 0x0369, pci_mmcfg_nvidia_mcp55 },
321};
322
323static void __init pci_mmcfg_check_end_bus_number(void)
324{
325 struct pci_mmcfg_region *cfg, *cfgx;
326
327
328 list_for_each_entry(cfg, &pci_mmcfg_list, list) {
329 if (cfg->end_bus < cfg->start_bus)
330 cfg->end_bus = 255;
331
332
333 if (cfg->list.next == &pci_mmcfg_list)
334 break;
335
336 cfgx = list_entry(cfg->list.next, typeof(*cfg), list);
337 if (cfg->end_bus >= cfgx->start_bus)
338 cfg->end_bus = cfgx->start_bus - 1;
339 }
340}
341
342static int __init pci_mmcfg_check_hostbridge(void)
343{
344 u32 l;
345 u32 bus, devfn;
346 u16 vendor, device;
347 int i;
348 const char *name;
349
350 if (!raw_pci_ops)
351 return 0;
352
353 free_all_mmcfg();
354
355 for (i = 0; i < ARRAY_SIZE(pci_mmcfg_probes); i++) {
356 bus = pci_mmcfg_probes[i].bus;
357 devfn = pci_mmcfg_probes[i].devfn;
358 raw_pci_ops->read(0, bus, devfn, 0, 4, &l);
359 vendor = l & 0xffff;
360 device = (l >> 16) & 0xffff;
361
362 name = NULL;
363 if (pci_mmcfg_probes[i].vendor == vendor &&
364 pci_mmcfg_probes[i].device == device)
365 name = pci_mmcfg_probes[i].probe();
366
367 if (name)
368 pr_info(PREFIX "%s with MMCONFIG support\n", name);
369 }
370
371
372 pci_mmcfg_check_end_bus_number();
373
374 return !list_empty(&pci_mmcfg_list);
375}
376
377static acpi_status check_mcfg_resource(struct acpi_resource *res, void *data)
378{
379 struct resource *mcfg_res = data;
380 struct acpi_resource_address64 address;
381 acpi_status status;
382
383 if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
384 struct acpi_resource_fixed_memory32 *fixmem32 =
385 &res->data.fixed_memory32;
386 if (!fixmem32)
387 return AE_OK;
388 if ((mcfg_res->start >= fixmem32->address) &&
389 (mcfg_res->end < (fixmem32->address +
390 fixmem32->address_length))) {
391 mcfg_res->flags = 1;
392 return AE_CTRL_TERMINATE;
393 }
394 }
395 if ((res->type != ACPI_RESOURCE_TYPE_ADDRESS32) &&
396 (res->type != ACPI_RESOURCE_TYPE_ADDRESS64))
397 return AE_OK;
398
399 status = acpi_resource_to_address64(res, &address);
400 if (ACPI_FAILURE(status) ||
401 (address.address.address_length <= 0) ||
402 (address.resource_type != ACPI_MEMORY_RANGE))
403 return AE_OK;
404
405 if ((mcfg_res->start >= address.address.minimum) &&
406 (mcfg_res->end < (address.address.minimum + address.address.address_length))) {
407 mcfg_res->flags = 1;
408 return AE_CTRL_TERMINATE;
409 }
410 return AE_OK;
411}
412
413static acpi_status find_mboard_resource(acpi_handle handle, u32 lvl,
414 void *context, void **rv)
415{
416 struct resource *mcfg_res = context;
417
418 acpi_walk_resources(handle, METHOD_NAME__CRS,
419 check_mcfg_resource, context);
420
421 if (mcfg_res->flags)
422 return AE_CTRL_TERMINATE;
423
424 return AE_OK;
425}
426
427static bool is_acpi_reserved(u64 start, u64 end, unsigned not_used)
428{
429 struct resource mcfg_res;
430
431 mcfg_res.start = start;
432 mcfg_res.end = end - 1;
433 mcfg_res.flags = 0;
434
435 acpi_get_devices("PNP0C01", find_mboard_resource, &mcfg_res, NULL);
436
437 if (!mcfg_res.flags)
438 acpi_get_devices("PNP0C02", find_mboard_resource, &mcfg_res,
439 NULL);
440
441 return mcfg_res.flags;
442}
443
444typedef bool (*check_reserved_t)(u64 start, u64 end, unsigned type);
445
446static bool __ref is_mmconf_reserved(check_reserved_t is_reserved,
447 struct pci_mmcfg_region *cfg,
448 struct device *dev, int with_e820)
449{
450 u64 addr = cfg->res.start;
451 u64 size = resource_size(&cfg->res);
452 u64 old_size = size;
453 int num_buses;
454 char *method = with_e820 ? "E820" : "ACPI motherboard resources";
455
456 while (!is_reserved(addr, addr + size, E820_TYPE_RESERVED)) {
457 size >>= 1;
458 if (size < (16UL<<20))
459 break;
460 }
461
462 if (size < (16UL<<20) && size != old_size)
463 return 0;
464
465 if (dev)
466 dev_info(dev, "MMCONFIG at %pR reserved in %s\n",
467 &cfg->res, method);
468 else
469 pr_info(PREFIX "MMCONFIG at %pR reserved in %s\n",
470 &cfg->res, method);
471
472 if (old_size != size) {
473
474 cfg->end_bus = cfg->start_bus + ((size>>20) - 1);
475 num_buses = cfg->end_bus - cfg->start_bus + 1;
476 cfg->res.end = cfg->res.start +
477 PCI_MMCFG_BUS_OFFSET(num_buses) - 1;
478 snprintf(cfg->name, PCI_MMCFG_RESOURCE_NAME_LEN,
479 "PCI MMCONFIG %04x [bus %02x-%02x]",
480 cfg->segment, cfg->start_bus, cfg->end_bus);
481
482 if (dev)
483 dev_info(dev,
484 "MMCONFIG "
485 "at %pR (base %#lx) (size reduced!)\n",
486 &cfg->res, (unsigned long) cfg->address);
487 else
488 pr_info(PREFIX
489 "MMCONFIG for %04x [bus%02x-%02x] "
490 "at %pR (base %#lx) (size reduced!)\n",
491 cfg->segment, cfg->start_bus, cfg->end_bus,
492 &cfg->res, (unsigned long) cfg->address);
493 }
494
495 return 1;
496}
497
498static bool __ref
499pci_mmcfg_check_reserved(struct device *dev, struct pci_mmcfg_region *cfg, int early)
500{
501 if (!early && !acpi_disabled) {
502 if (is_mmconf_reserved(is_acpi_reserved, cfg, dev, 0))
503 return 1;
504
505 if (dev)
506 dev_info(dev, FW_INFO
507 "MMCONFIG at %pR not reserved in "
508 "ACPI motherboard resources\n",
509 &cfg->res);
510 else
511 pr_info(FW_INFO PREFIX
512 "MMCONFIG at %pR not reserved in "
513 "ACPI motherboard resources\n",
514 &cfg->res);
515 }
516
517
518
519
520
521
522
523 if (pci_mmcfg_running_state)
524 return 1;
525
526
527
528 if (raw_pci_ops)
529 return is_mmconf_reserved(e820__mapped_all, cfg, dev, 1);
530
531 return 0;
532}
533
534static void __init pci_mmcfg_reject_broken(int early)
535{
536 struct pci_mmcfg_region *cfg;
537
538 list_for_each_entry(cfg, &pci_mmcfg_list, list) {
539 if (pci_mmcfg_check_reserved(NULL, cfg, early) == 0) {
540 pr_info(PREFIX "not using MMCONFIG\n");
541 free_all_mmcfg();
542 return;
543 }
544 }
545}
546
547static int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
548 struct acpi_mcfg_allocation *cfg)
549{
550 if (cfg->address < 0xFFFFFFFF)
551 return 0;
552
553 if (!strncmp(mcfg->header.oem_id, "SGI", 3))
554 return 0;
555
556 if ((mcfg->header.revision >= 1) && (dmi_get_bios_year() >= 2010))
557 return 0;
558
559 pr_err(PREFIX "MCFG region for %04x [bus %02x-%02x] at %#llx "
560 "is above 4GB, ignored\n", cfg->pci_segment,
561 cfg->start_bus_number, cfg->end_bus_number, cfg->address);
562 return -EINVAL;
563}
564
565static int __init pci_parse_mcfg(struct acpi_table_header *header)
566{
567 struct acpi_table_mcfg *mcfg;
568 struct acpi_mcfg_allocation *cfg_table, *cfg;
569 unsigned long i;
570 int entries;
571
572 if (!header)
573 return -EINVAL;
574
575 mcfg = (struct acpi_table_mcfg *)header;
576
577
578 free_all_mmcfg();
579 entries = 0;
580 i = header->length - sizeof(struct acpi_table_mcfg);
581 while (i >= sizeof(struct acpi_mcfg_allocation)) {
582 entries++;
583 i -= sizeof(struct acpi_mcfg_allocation);
584 }
585 if (entries == 0) {
586 pr_err(PREFIX "MMCONFIG has no entries\n");
587 return -ENODEV;
588 }
589
590 cfg_table = (struct acpi_mcfg_allocation *) &mcfg[1];
591 for (i = 0; i < entries; i++) {
592 cfg = &cfg_table[i];
593 if (acpi_mcfg_check_entry(mcfg, cfg)) {
594 free_all_mmcfg();
595 return -ENODEV;
596 }
597
598 if (pci_mmconfig_add(cfg->pci_segment, cfg->start_bus_number,
599 cfg->end_bus_number, cfg->address) == NULL) {
600 pr_warn(PREFIX "no memory for MCFG entries\n");
601 free_all_mmcfg();
602 return -ENOMEM;
603 }
604 }
605
606 return 0;
607}
608
609#ifdef CONFIG_ACPI_APEI
610extern int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size,
611 void *data), void *data);
612
613static int pci_mmcfg_for_each_region(int (*func)(__u64 start, __u64 size,
614 void *data), void *data)
615{
616 struct pci_mmcfg_region *cfg;
617 int rc;
618
619 if (list_empty(&pci_mmcfg_list))
620 return 0;
621
622 list_for_each_entry(cfg, &pci_mmcfg_list, list) {
623 rc = func(cfg->res.start, resource_size(&cfg->res), data);
624 if (rc)
625 return rc;
626 }
627
628 return 0;
629}
630#define set_apei_filter() (arch_apei_filter_addr = pci_mmcfg_for_each_region)
631#else
632#define set_apei_filter()
633#endif
634
635static void __init __pci_mmcfg_init(int early)
636{
637 pci_mmcfg_reject_broken(early);
638 if (list_empty(&pci_mmcfg_list))
639 return;
640
641 if (pcibios_last_bus < 0) {
642 const struct pci_mmcfg_region *cfg;
643
644 list_for_each_entry(cfg, &pci_mmcfg_list, list) {
645 if (cfg->segment)
646 break;
647 pcibios_last_bus = cfg->end_bus;
648 }
649 }
650
651 if (pci_mmcfg_arch_init())
652 pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
653 else {
654 free_all_mmcfg();
655 pci_mmcfg_arch_init_failed = true;
656 }
657}
658
659static int __initdata known_bridge;
660
661void __init pci_mmcfg_early_init(void)
662{
663 if (pci_probe & PCI_PROBE_MMCONF) {
664 if (pci_mmcfg_check_hostbridge())
665 known_bridge = 1;
666 else
667 acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
668 __pci_mmcfg_init(1);
669
670 set_apei_filter();
671 }
672}
673
674void __init pci_mmcfg_late_init(void)
675{
676
677 if ((pci_probe & PCI_PROBE_MMCONF) == 0)
678 return;
679
680 if (known_bridge)
681 return;
682
683
684 if (pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF) {
685 acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
686 __pci_mmcfg_init(0);
687 }
688}
689
690static int __init pci_mmcfg_late_insert_resources(void)
691{
692 struct pci_mmcfg_region *cfg;
693
694 pci_mmcfg_running_state = true;
695
696
697 if ((pci_probe & PCI_PROBE_MMCONF) == 0)
698 return 1;
699
700
701
702
703
704
705 list_for_each_entry(cfg, &pci_mmcfg_list, list)
706 if (!cfg->res.parent)
707 insert_resource(&iomem_resource, &cfg->res);
708
709 return 0;
710}
711
712
713
714
715
716
717late_initcall(pci_mmcfg_late_insert_resources);
718
719
720int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
721 phys_addr_t addr)
722{
723 int rc;
724 struct resource *tmp = NULL;
725 struct pci_mmcfg_region *cfg;
726
727 if (!(pci_probe & PCI_PROBE_MMCONF) || pci_mmcfg_arch_init_failed)
728 return -ENODEV;
729
730 if (start > end)
731 return -EINVAL;
732
733 mutex_lock(&pci_mmcfg_lock);
734 cfg = pci_mmconfig_lookup(seg, start);
735 if (cfg) {
736 if (cfg->end_bus < end)
737 dev_info(dev, FW_INFO
738 "MMCONFIG for "
739 "domain %04x [bus %02x-%02x] "
740 "only partially covers this bridge\n",
741 cfg->segment, cfg->start_bus, cfg->end_bus);
742 mutex_unlock(&pci_mmcfg_lock);
743 return -EEXIST;
744 }
745
746 if (!addr) {
747 mutex_unlock(&pci_mmcfg_lock);
748 return -EINVAL;
749 }
750
751 rc = -EBUSY;
752 cfg = pci_mmconfig_alloc(seg, start, end, addr);
753 if (cfg == NULL) {
754 dev_warn(dev, "fail to add MMCONFIG (out of memory)\n");
755 rc = -ENOMEM;
756 } else if (!pci_mmcfg_check_reserved(dev, cfg, 0)) {
757 dev_warn(dev, FW_BUG "MMCONFIG %pR isn't reserved\n",
758 &cfg->res);
759 } else {
760
761 if (pci_mmcfg_running_state)
762 tmp = insert_resource_conflict(&iomem_resource,
763 &cfg->res);
764
765 if (tmp) {
766 dev_warn(dev,
767 "MMCONFIG %pR conflicts with "
768 "%s %pR\n",
769 &cfg->res, tmp->name, tmp);
770 } else if (pci_mmcfg_arch_map(cfg)) {
771 dev_warn(dev, "fail to map MMCONFIG %pR.\n",
772 &cfg->res);
773 } else {
774 list_add_sorted(cfg);
775 dev_info(dev, "MMCONFIG at %pR (base %#lx)\n",
776 &cfg->res, (unsigned long)addr);
777 cfg = NULL;
778 rc = 0;
779 }
780 }
781
782 if (cfg) {
783 if (cfg->res.parent)
784 release_resource(&cfg->res);
785 kfree(cfg);
786 }
787
788 mutex_unlock(&pci_mmcfg_lock);
789
790 return rc;
791}
792
793
794int pci_mmconfig_delete(u16 seg, u8 start, u8 end)
795{
796 struct pci_mmcfg_region *cfg;
797
798 mutex_lock(&pci_mmcfg_lock);
799 list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
800 if (cfg->segment == seg && cfg->start_bus == start &&
801 cfg->end_bus == end) {
802 list_del_rcu(&cfg->list);
803 synchronize_rcu();
804 pci_mmcfg_arch_unmap(cfg);
805 if (cfg->res.parent)
806 release_resource(&cfg->res);
807 mutex_unlock(&pci_mmcfg_lock);
808 kfree(cfg);
809 return 0;
810 }
811 mutex_unlock(&pci_mmcfg_lock);
812
813 return -ENOENT;
814}
815
