blob: e282886616a0909af26bac0fec79591857e237c4 [file] [log] [blame]
Olivier Galibertb7867392007-02-13 13:26:20 +01001/*
2 * mmconfig-shared.c - Low-level direct PCI config space access via
3 * MMCONFIG - common code between i386 and x86-64.
4 *
5 * This code does:
Olivier Galibert9358c692007-02-13 13:26:20 +01006 * - known chipset handling
Olivier Galibertb7867392007-02-13 13:26:20 +01007 * - ACPI decoding and validation
8 *
9 * Per-architecture code takes care of the mappings and accesses
10 * themselves.
11 */
12
13#include <linux/pci.h>
14#include <linux/init.h>
15#include <linux/acpi.h>
Feng Tang5f0db7a2009-08-14 15:37:50 -040016#include <linux/sfi_acpi.h>
Olivier Galibertb7867392007-02-13 13:26:20 +010017#include <linux/bitmap.h>
Bjorn Helgaas9a08f7d2009-10-23 15:20:33 -060018#include <linux/dmi.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Olivier Galibertb7867392007-02-13 13:26:20 +010020#include <asm/e820.h>
Jaswinder Singh Rajput82487712008-12-27 18:32:28 +053021#include <asm/pci_x86.h>
Feng Tang5f0db7a2009-08-14 15:37:50 -040022#include <asm/acpi.h>
Olivier Galibertb7867392007-02-13 13:26:20 +010023
Len Brownf4a2d582009-07-28 16:48:02 -040024#define PREFIX "PCI: "
Len Browna192a952009-07-28 16:45:54 -040025
Aaron Durbina5ba7972007-07-21 17:10:34 +020026/* Indicate if the mmcfg resources have been placed into the resource table. */
27static int __initdata pci_mmcfg_resources_inserted;
28
Bjorn Helgaasff097dd2009-11-13 17:34:49 -070029LIST_HEAD(pci_mmcfg_list);
30
Bjorn Helgaasba2afba2009-11-13 17:34:54 -070031static __init void pci_mmconfig_remove(struct pci_mmcfg_region *cfg)
32{
33 if (cfg->res.parent)
34 release_resource(&cfg->res);
35 list_del(&cfg->list);
36 kfree(cfg);
37}
38
Bjorn Helgaas7da7d362009-11-13 17:33:53 -070039static __init void free_all_mmcfg(void)
40{
Bjorn Helgaasff097dd2009-11-13 17:34:49 -070041 struct pci_mmcfg_region *cfg, *tmp;
Bjorn Helgaas56ddf4d2009-11-13 17:34:29 -070042
Bjorn Helgaas7da7d362009-11-13 17:33:53 -070043 pci_mmcfg_arch_free();
Bjorn Helgaasba2afba2009-11-13 17:34:54 -070044 list_for_each_entry_safe(cfg, tmp, &pci_mmcfg_list, list)
45 pci_mmconfig_remove(cfg);
Bjorn Helgaasff097dd2009-11-13 17:34:49 -070046}
47
48static __init void list_add_sorted(struct pci_mmcfg_region *new)
49{
50 struct pci_mmcfg_region *cfg;
51
52 /* keep list sorted by segment and starting bus number */
53 list_for_each_entry(cfg, &pci_mmcfg_list, list) {
54 if (cfg->segment > new->segment ||
55 (cfg->segment == new->segment &&
56 cfg->start_bus >= new->start_bus)) {
57 list_add_tail(&new->list, &cfg->list);
58 return;
59 }
60 }
61 list_add_tail(&new->list, &pci_mmcfg_list);
Bjorn Helgaas7da7d362009-11-13 17:33:53 -070062}
63
Bjorn Helgaasd215a9c2009-11-13 17:34:13 -070064static __init struct pci_mmcfg_region *pci_mmconfig_add(int segment, int start,
65 int end, u64 addr)
Yinghai Lu068258b2009-03-19 20:55:35 -070066{
Bjorn Helgaasd215a9c2009-11-13 17:34:13 -070067 struct pci_mmcfg_region *new;
Bjorn Helgaas56ddf4d2009-11-13 17:34:29 -070068 struct resource *res;
Yinghai Lu068258b2009-03-19 20:55:35 -070069
Bjorn Helgaasf7ca6982009-11-13 17:34:03 -070070 if (addr == 0)
71 return NULL;
72
Bjorn Helgaasff097dd2009-11-13 17:34:49 -070073 new = kzalloc(sizeof(*new), GFP_KERNEL);
Yinghai Lu068258b2009-03-19 20:55:35 -070074 if (!new)
Bjorn Helgaas7da7d362009-11-13 17:33:53 -070075 return NULL;
Yinghai Lu068258b2009-03-19 20:55:35 -070076
Bjorn Helgaas95cf1cf2009-11-13 17:34:24 -070077 new->address = addr;
78 new->segment = segment;
79 new->start_bus = start;
80 new->end_bus = end;
Bjorn Helgaas7da7d362009-11-13 17:33:53 -070081
Bjorn Helgaasff097dd2009-11-13 17:34:49 -070082 list_add_sorted(new);
83
Bjorn Helgaas56ddf4d2009-11-13 17:34:29 -070084 res = &new->res;
85 res->start = addr + PCI_MMCFG_BUS_OFFSET(start);
Bjorn Helgaas1ca98fa2010-10-04 12:49:24 -060086 res->end = addr + PCI_MMCFG_BUS_OFFSET(end + 1) - 1;
Bjorn Helgaas56ddf4d2009-11-13 17:34:29 -070087 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
88 snprintf(new->name, PCI_MMCFG_RESOURCE_NAME_LEN,
89 "PCI MMCONFIG %04x [bus %02x-%02x]", segment, start, end);
90 res->name = new->name;
91
Bjorn Helgaas8c577862009-11-13 17:34:59 -070092 printk(KERN_INFO PREFIX "MMCONFIG for domain %04x [bus %02x-%02x] at "
93 "%pR (base %#lx)\n", segment, start, end, &new->res,
94 (unsigned long) addr);
95
Bjorn Helgaasff097dd2009-11-13 17:34:49 -070096 return new;
Yinghai Lu068258b2009-03-19 20:55:35 -070097}
98
Bjorn Helgaasf6e1d8c2009-11-13 17:35:04 -070099struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus)
100{
101 struct pci_mmcfg_region *cfg;
102
103 list_for_each_entry(cfg, &pci_mmcfg_list, list)
104 if (cfg->segment == segment &&
105 cfg->start_bus <= bus && bus <= cfg->end_bus)
106 return cfg;
107
108 return NULL;
109}
110
OGAWA Hirofumi429d5122007-02-13 13:26:20 +0100111static const char __init *pci_mmcfg_e7520(void)
Olivier Galibert9358c692007-02-13 13:26:20 +0100112{
113 u32 win;
Yinghai Lubb63b422008-02-28 23:56:50 -0800114 raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0xce, 2, &win);
Olivier Galibert9358c692007-02-13 13:26:20 +0100115
Olivier Galibertb5229db2007-05-02 19:27:22 +0200116 win = win & 0xf000;
Yinghai Lu068258b2009-03-19 20:55:35 -0700117 if (win == 0x0000 || win == 0xf000)
118 return NULL;
119
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700120 if (pci_mmconfig_add(0, 0, 255, win << 16) == NULL)
Yinghai Lu068258b2009-03-19 20:55:35 -0700121 return NULL;
122
Olivier Galibert9358c692007-02-13 13:26:20 +0100123 return "Intel Corporation E7520 Memory Controller Hub";
124}
125
OGAWA Hirofumi429d5122007-02-13 13:26:20 +0100126static const char __init *pci_mmcfg_intel_945(void)
Olivier Galibert9358c692007-02-13 13:26:20 +0100127{
128 u32 pciexbar, mask = 0, len = 0;
129
Yinghai Lubb63b422008-02-28 23:56:50 -0800130 raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0x48, 4, &pciexbar);
Olivier Galibert9358c692007-02-13 13:26:20 +0100131
132 /* Enable bit */
133 if (!(pciexbar & 1))
Yinghai Lu068258b2009-03-19 20:55:35 -0700134 return NULL;
Olivier Galibert9358c692007-02-13 13:26:20 +0100135
136 /* Size bits */
137 switch ((pciexbar >> 1) & 3) {
138 case 0:
139 mask = 0xf0000000U;
140 len = 0x10000000U;
141 break;
142 case 1:
143 mask = 0xf8000000U;
144 len = 0x08000000U;
145 break;
146 case 2:
147 mask = 0xfc000000U;
148 len = 0x04000000U;
149 break;
150 default:
Yinghai Lu068258b2009-03-19 20:55:35 -0700151 return NULL;
Olivier Galibert9358c692007-02-13 13:26:20 +0100152 }
153
154 /* Errata #2, things break when not aligned on a 256Mb boundary */
155 /* Can only happen in 64M/128M mode */
156
157 if ((pciexbar & mask) & 0x0fffffffU)
Yinghai Lu068258b2009-03-19 20:55:35 -0700158 return NULL;
Olivier Galibert9358c692007-02-13 13:26:20 +0100159
Olivier Galibertb5229db2007-05-02 19:27:22 +0200160 /* Don't hit the APIC registers and their friends */
161 if ((pciexbar & mask) >= 0xf0000000U)
Yinghai Lu068258b2009-03-19 20:55:35 -0700162 return NULL;
Olivier Galibertb5229db2007-05-02 19:27:22 +0200163
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700164 if (pci_mmconfig_add(0, 0, (len >> 20) - 1, pciexbar & mask) == NULL)
Yinghai Lu068258b2009-03-19 20:55:35 -0700165 return NULL;
166
Olivier Galibert9358c692007-02-13 13:26:20 +0100167 return "Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub";
168}
169
Yinghai Lu7fd0da42008-02-19 03:13:02 -0800170static const char __init *pci_mmcfg_amd_fam10h(void)
171{
172 u32 low, high, address;
173 u64 base, msr;
174 int i;
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700175 unsigned segnbits = 0, busnbits, end_bus;
Yinghai Lu7fd0da42008-02-19 03:13:02 -0800176
Yinghai Lu5f0b2972008-04-14 16:08:25 -0700177 if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF))
178 return NULL;
179
Yinghai Lu7fd0da42008-02-19 03:13:02 -0800180 address = MSR_FAM10H_MMIO_CONF_BASE;
181 if (rdmsr_safe(address, &low, &high))
182 return NULL;
183
184 msr = high;
185 msr <<= 32;
186 msr |= low;
187
188 /* mmconfig is not enable */
189 if (!(msr & FAM10H_MMIO_CONF_ENABLE))
190 return NULL;
191
192 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
193
194 busnbits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
195 FAM10H_MMIO_CONF_BUSRANGE_MASK;
196
197 /*
198 * only handle bus 0 ?
199 * need to skip it
200 */
201 if (!busnbits)
202 return NULL;
203
204 if (busnbits > 8) {
205 segnbits = busnbits - 8;
206 busnbits = 8;
207 }
208
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700209 end_bus = (1 << busnbits) - 1;
Yinghai Lu068258b2009-03-19 20:55:35 -0700210 for (i = 0; i < (1 << segnbits); i++)
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700211 if (pci_mmconfig_add(i, 0, end_bus,
212 base + (1<<28) * i) == NULL) {
213 free_all_mmcfg();
214 return NULL;
215 }
Yinghai Lu7fd0da42008-02-19 03:13:02 -0800216
217 return "AMD Family 10h NB";
218}
219
Ed Swierk5546d6f2009-03-19 20:57:56 -0700220static bool __initdata mcp55_checked;
221static const char __init *pci_mmcfg_nvidia_mcp55(void)
222{
223 int bus;
224 int mcp55_mmconf_found = 0;
225
226 static const u32 extcfg_regnum = 0x90;
227 static const u32 extcfg_regsize = 4;
228 static const u32 extcfg_enable_mask = 1<<31;
229 static const u32 extcfg_start_mask = 0xff<<16;
230 static const int extcfg_start_shift = 16;
231 static const u32 extcfg_size_mask = 0x3<<28;
232 static const int extcfg_size_shift = 28;
233 static const int extcfg_sizebus[] = {0x100, 0x80, 0x40, 0x20};
234 static const u32 extcfg_base_mask[] = {0x7ff8, 0x7ffc, 0x7ffe, 0x7fff};
235 static const int extcfg_base_lshift = 25;
236
237 /*
238 * do check if amd fam10h already took over
239 */
Bjorn Helgaasff097dd2009-11-13 17:34:49 -0700240 if (!acpi_disabled || !list_empty(&pci_mmcfg_list) || mcp55_checked)
Ed Swierk5546d6f2009-03-19 20:57:56 -0700241 return NULL;
242
243 mcp55_checked = true;
244 for (bus = 0; bus < 256; bus++) {
245 u64 base;
246 u32 l, extcfg;
247 u16 vendor, device;
248 int start, size_index, end;
249
250 raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), 0, 4, &l);
251 vendor = l & 0xffff;
252 device = (l >> 16) & 0xffff;
253
254 if (PCI_VENDOR_ID_NVIDIA != vendor || 0x0369 != device)
255 continue;
256
257 raw_pci_ops->read(0, bus, PCI_DEVFN(0, 0), extcfg_regnum,
258 extcfg_regsize, &extcfg);
259
260 if (!(extcfg & extcfg_enable_mask))
261 continue;
262
Ed Swierk5546d6f2009-03-19 20:57:56 -0700263 size_index = (extcfg & extcfg_size_mask) >> extcfg_size_shift;
264 base = extcfg & extcfg_base_mask[size_index];
265 /* base could > 4G */
266 base <<= extcfg_base_lshift;
267 start = (extcfg & extcfg_start_mask) >> extcfg_start_shift;
268 end = start + extcfg_sizebus[size_index] - 1;
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700269 if (pci_mmconfig_add(0, start, end, base) == NULL)
270 continue;
Ed Swierk5546d6f2009-03-19 20:57:56 -0700271 mcp55_mmconf_found++;
272 }
273
274 if (!mcp55_mmconf_found)
275 return NULL;
276
277 return "nVidia MCP55";
278}
279
Olivier Galibert9358c692007-02-13 13:26:20 +0100280struct pci_mmcfg_hostbridge_probe {
Yinghai Lu7fd0da42008-02-19 03:13:02 -0800281 u32 bus;
282 u32 devfn;
Olivier Galibert9358c692007-02-13 13:26:20 +0100283 u32 vendor;
284 u32 device;
285 const char *(*probe)(void);
286};
287
OGAWA Hirofumi429d5122007-02-13 13:26:20 +0100288static struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] __initdata = {
Yinghai Lu7fd0da42008-02-19 03:13:02 -0800289 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL,
290 PCI_DEVICE_ID_INTEL_E7520_MCH, pci_mmcfg_e7520 },
291 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL,
292 PCI_DEVICE_ID_INTEL_82945G_HB, pci_mmcfg_intel_945 },
293 { 0, PCI_DEVFN(0x18, 0), PCI_VENDOR_ID_AMD,
294 0x1200, pci_mmcfg_amd_fam10h },
295 { 0xff, PCI_DEVFN(0, 0), PCI_VENDOR_ID_AMD,
296 0x1200, pci_mmcfg_amd_fam10h },
Ed Swierk5546d6f2009-03-19 20:57:56 -0700297 { 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_NVIDIA,
298 0x0369, pci_mmcfg_nvidia_mcp55 },
Olivier Galibert9358c692007-02-13 13:26:20 +0100299};
300
Yinghai Lu068258b2009-03-19 20:55:35 -0700301static void __init pci_mmcfg_check_end_bus_number(void)
302{
Bjorn Helgaas987c3672009-11-13 17:34:44 -0700303 struct pci_mmcfg_region *cfg, *cfgx;
Yinghai Lu068258b2009-03-19 20:55:35 -0700304
Thomas Gleixnerbb8d4132010-02-25 16:42:11 +0100305 /* Fixup overlaps */
Bjorn Helgaasff097dd2009-11-13 17:34:49 -0700306 list_for_each_entry(cfg, &pci_mmcfg_list, list) {
Bjorn Helgaasd7e6b662009-11-13 17:34:18 -0700307 if (cfg->end_bus < cfg->start_bus)
308 cfg->end_bus = 255;
Yinghai Lu068258b2009-03-19 20:55:35 -0700309
Thomas Gleixnerbb8d4132010-02-25 16:42:11 +0100310 /* Don't access the list head ! */
311 if (cfg->list.next == &pci_mmcfg_list)
312 break;
313
Bjorn Helgaasff097dd2009-11-13 17:34:49 -0700314 cfgx = list_entry(cfg->list.next, typeof(*cfg), list);
Thomas Gleixnerbb8d4132010-02-25 16:42:11 +0100315 if (cfg->end_bus >= cfgx->start_bus)
Bjorn Helgaasd7e6b662009-11-13 17:34:18 -0700316 cfg->end_bus = cfgx->start_bus - 1;
Yinghai Lu068258b2009-03-19 20:55:35 -0700317 }
318}
319
Olivier Galibert9358c692007-02-13 13:26:20 +0100320static int __init pci_mmcfg_check_hostbridge(void)
321{
322 u32 l;
Yinghai Lu7fd0da42008-02-19 03:13:02 -0800323 u32 bus, devfn;
Olivier Galibert9358c692007-02-13 13:26:20 +0100324 u16 vendor, device;
325 int i;
326 const char *name;
327
Yinghai Lubb63b422008-02-28 23:56:50 -0800328 if (!raw_pci_ops)
329 return 0;
330
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700331 free_all_mmcfg();
Olivier Galibert9358c692007-02-13 13:26:20 +0100332
Yinghai Lu068258b2009-03-19 20:55:35 -0700333 for (i = 0; i < ARRAY_SIZE(pci_mmcfg_probes); i++) {
Yinghai Lu7fd0da42008-02-19 03:13:02 -0800334 bus = pci_mmcfg_probes[i].bus;
335 devfn = pci_mmcfg_probes[i].devfn;
Yinghai Lubb63b422008-02-28 23:56:50 -0800336 raw_pci_ops->read(0, bus, devfn, 0, 4, &l);
Yinghai Lu7fd0da42008-02-19 03:13:02 -0800337 vendor = l & 0xffff;
338 device = (l >> 16) & 0xffff;
339
Yinghai Lu068258b2009-03-19 20:55:35 -0700340 name = NULL;
OGAWA Hirofumi429d5122007-02-13 13:26:20 +0100341 if (pci_mmcfg_probes[i].vendor == vendor &&
342 pci_mmcfg_probes[i].device == device)
Olivier Galibert9358c692007-02-13 13:26:20 +0100343 name = pci_mmcfg_probes[i].probe();
Yinghai Lu068258b2009-03-19 20:55:35 -0700344
345 if (name)
Bjorn Helgaas8c577862009-11-13 17:34:59 -0700346 printk(KERN_INFO PREFIX "%s with MMCONFIG support\n",
Yinghai Lu068258b2009-03-19 20:55:35 -0700347 name);
OGAWA Hirofumi429d5122007-02-13 13:26:20 +0100348 }
Olivier Galibert9358c692007-02-13 13:26:20 +0100349
Yinghai Lu068258b2009-03-19 20:55:35 -0700350 /* some end_bus_number is crazy, fix it */
351 pci_mmcfg_check_end_bus_number();
Olivier Galibert9358c692007-02-13 13:26:20 +0100352
Bjorn Helgaasff097dd2009-11-13 17:34:49 -0700353 return !list_empty(&pci_mmcfg_list);
Olivier Galibert9358c692007-02-13 13:26:20 +0100354}
355
Yinghai Luebd60cd2008-09-04 21:04:32 +0200356static void __init pci_mmcfg_insert_resources(void)
Olivier Galibert6a0668f2007-02-13 13:26:20 +0100357{
Bjorn Helgaas56ddf4d2009-11-13 17:34:29 -0700358 struct pci_mmcfg_region *cfg;
Olivier Galibert6a0668f2007-02-13 13:26:20 +0100359
Bjorn Helgaasff097dd2009-11-13 17:34:49 -0700360 list_for_each_entry(cfg, &pci_mmcfg_list, list)
Bjorn Helgaas56ddf4d2009-11-13 17:34:29 -0700361 insert_resource(&iomem_resource, &cfg->res);
Aaron Durbina5ba7972007-07-21 17:10:34 +0200362
363 /* Mark that the resources have been inserted. */
364 pci_mmcfg_resources_inserted = 1;
Olivier Galibert6a0668f2007-02-13 13:26:20 +0100365}
366
Robert Hancock7752d5c2008-02-15 01:27:20 -0800367static acpi_status __init check_mcfg_resource(struct acpi_resource *res,
368 void *data)
369{
370 struct resource *mcfg_res = data;
371 struct acpi_resource_address64 address;
372 acpi_status status;
373
374 if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
375 struct acpi_resource_fixed_memory32 *fixmem32 =
376 &res->data.fixed_memory32;
377 if (!fixmem32)
378 return AE_OK;
379 if ((mcfg_res->start >= fixmem32->address) &&
Yinghai Lu75e613c2009-06-03 00:13:13 -0700380 (mcfg_res->end < (fixmem32->address +
Robert Hancock7752d5c2008-02-15 01:27:20 -0800381 fixmem32->address_length))) {
382 mcfg_res->flags = 1;
383 return AE_CTRL_TERMINATE;
384 }
385 }
386 if ((res->type != ACPI_RESOURCE_TYPE_ADDRESS32) &&
387 (res->type != ACPI_RESOURCE_TYPE_ADDRESS64))
388 return AE_OK;
389
390 status = acpi_resource_to_address64(res, &address);
391 if (ACPI_FAILURE(status) ||
392 (address.address_length <= 0) ||
393 (address.resource_type != ACPI_MEMORY_RANGE))
394 return AE_OK;
395
396 if ((mcfg_res->start >= address.minimum) &&
Yinghai Lu75e613c2009-06-03 00:13:13 -0700397 (mcfg_res->end < (address.minimum + address.address_length))) {
Robert Hancock7752d5c2008-02-15 01:27:20 -0800398 mcfg_res->flags = 1;
399 return AE_CTRL_TERMINATE;
400 }
401 return AE_OK;
402}
403
404static acpi_status __init find_mboard_resource(acpi_handle handle, u32 lvl,
405 void *context, void **rv)
406{
407 struct resource *mcfg_res = context;
408
409 acpi_walk_resources(handle, METHOD_NAME__CRS,
410 check_mcfg_resource, context);
411
412 if (mcfg_res->flags)
413 return AE_CTRL_TERMINATE;
414
415 return AE_OK;
416}
417
Yinghai Lua83fe322008-07-18 13:22:36 -0700418static int __init is_acpi_reserved(u64 start, u64 end, unsigned not_used)
Robert Hancock7752d5c2008-02-15 01:27:20 -0800419{
420 struct resource mcfg_res;
421
422 mcfg_res.start = start;
Yinghai Lu75e613c2009-06-03 00:13:13 -0700423 mcfg_res.end = end - 1;
Robert Hancock7752d5c2008-02-15 01:27:20 -0800424 mcfg_res.flags = 0;
425
426 acpi_get_devices("PNP0C01", find_mboard_resource, &mcfg_res, NULL);
427
428 if (!mcfg_res.flags)
429 acpi_get_devices("PNP0C02", find_mboard_resource, &mcfg_res,
430 NULL);
431
432 return mcfg_res.flags;
433}
434
Yinghai Lua83fe322008-07-18 13:22:36 -0700435typedef int (*check_reserved_t)(u64 start, u64 end, unsigned type);
436
437static int __init is_mmconf_reserved(check_reserved_t is_reserved,
Bjorn Helgaas8c577862009-11-13 17:34:59 -0700438 struct pci_mmcfg_region *cfg, int with_e820)
Yinghai Lua83fe322008-07-18 13:22:36 -0700439{
Bjorn Helgaas2f2a8b92009-11-13 17:34:34 -0700440 u64 addr = cfg->res.start;
441 u64 size = resource_size(&cfg->res);
Yinghai Lua83fe322008-07-18 13:22:36 -0700442 u64 old_size = size;
Bjorn Helgaas56ddf4d2009-11-13 17:34:29 -0700443 int valid = 0, num_buses;
Yinghai Lua83fe322008-07-18 13:22:36 -0700444
Yinghai Lu044cd802009-04-18 01:43:46 -0700445 while (!is_reserved(addr, addr + size, E820_RESERVED)) {
Yinghai Lua83fe322008-07-18 13:22:36 -0700446 size >>= 1;
447 if (size < (16UL<<20))
448 break;
449 }
450
451 if (size >= (16UL<<20) || size == old_size) {
Bjorn Helgaas8c577862009-11-13 17:34:59 -0700452 printk(KERN_INFO PREFIX "MMCONFIG at %pR reserved in %s\n",
453 &cfg->res,
454 with_e820 ? "E820" : "ACPI motherboard resources");
Yinghai Lua83fe322008-07-18 13:22:36 -0700455 valid = 1;
456
457 if (old_size != size) {
Bjorn Helgaasd7e6b662009-11-13 17:34:18 -0700458 /* update end_bus */
459 cfg->end_bus = cfg->start_bus + ((size>>20) - 1);
Bjorn Helgaas56ddf4d2009-11-13 17:34:29 -0700460 num_buses = cfg->end_bus - cfg->start_bus + 1;
461 cfg->res.end = cfg->res.start +
462 PCI_MMCFG_BUS_OFFSET(num_buses) - 1;
463 snprintf(cfg->name, PCI_MMCFG_RESOURCE_NAME_LEN,
464 "PCI MMCONFIG %04x [bus %02x-%02x]",
465 cfg->segment, cfg->start_bus, cfg->end_bus);
Bjorn Helgaas8c577862009-11-13 17:34:59 -0700466 printk(KERN_INFO PREFIX
467 "MMCONFIG for %04x [bus%02x-%02x] "
468 "at %pR (base %#lx) (size reduced!)\n",
469 cfg->segment, cfg->start_bus, cfg->end_bus,
470 &cfg->res, (unsigned long) cfg->address);
Yinghai Lua83fe322008-07-18 13:22:36 -0700471 }
472 }
473
474 return valid;
475}
476
Yinghai Lubb63b422008-02-28 23:56:50 -0800477static void __init pci_mmcfg_reject_broken(int early)
OGAWA Hirofumi44de0202007-02-13 13:26:20 +0100478{
Bjorn Helgaas987c3672009-11-13 17:34:44 -0700479 struct pci_mmcfg_region *cfg;
OGAWA Hirofumi26054ed2007-02-13 13:26:20 +0100480
Bjorn Helgaasff097dd2009-11-13 17:34:49 -0700481 list_for_each_entry(cfg, &pci_mmcfg_list, list) {
Bjorn Helgaas56ddf4d2009-11-13 17:34:29 -0700482 int valid = 0;
Yinghai Lua83fe322008-07-18 13:22:36 -0700483
Feng Tanga02ce952010-05-05 17:08:49 +0800484 if (!early && !acpi_disabled) {
Bjorn Helgaas8c577862009-11-13 17:34:59 -0700485 valid = is_mmconf_reserved(is_acpi_reserved, cfg, 0);
Yinghai Lu05c58b82008-02-15 01:30:14 -0800486
Feng Tanga02ce952010-05-05 17:08:49 +0800487 if (valid)
488 continue;
489 else
490 printk(KERN_ERR FW_BUG PREFIX
491 "MMCONFIG at %pR not reserved in "
492 "ACPI motherboard resources\n",
493 &cfg->res);
494 }
Yinghai Lua83fe322008-07-18 13:22:36 -0700495
Yinghai Lu05c58b82008-02-15 01:30:14 -0800496 /* Don't try to do this check unless configuration
Yinghai Lubb63b422008-02-28 23:56:50 -0800497 type 1 is available. how about type 2 ?*/
Yinghai Lua83fe322008-07-18 13:22:36 -0700498 if (raw_pci_ops)
Bjorn Helgaas8c577862009-11-13 17:34:59 -0700499 valid = is_mmconf_reserved(e820_all_mapped, cfg, 1);
Yinghai Lu05c58b82008-02-15 01:30:14 -0800500
501 if (!valid)
502 goto reject;
OGAWA Hirofumi26054ed2007-02-13 13:26:20 +0100503 }
Robert Hancock7752d5c2008-02-15 01:27:20 -0800504
OGAWA Hirofumi26054ed2007-02-13 13:26:20 +0100505 return;
506
507reject:
Bjorn Helgaas8c577862009-11-13 17:34:59 -0700508 printk(KERN_INFO PREFIX "not using MMCONFIG\n");
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700509 free_all_mmcfg();
OGAWA Hirofumi44de0202007-02-13 13:26:20 +0100510}
511
Yinghai Lu05c58b82008-02-15 01:30:14 -0800512static int __initdata known_bridge;
513
Bjorn Helgaas9a08f7d2009-10-23 15:20:33 -0600514static int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
515 struct acpi_mcfg_allocation *cfg)
Len Brownc4bf2f32009-06-11 23:53:55 -0400516{
Bjorn Helgaas9a08f7d2009-10-23 15:20:33 -0600517 int year;
Len Brownc4bf2f32009-06-11 23:53:55 -0400518
Bjorn Helgaas9a08f7d2009-10-23 15:20:33 -0600519 if (cfg->address < 0xFFFFFFFF)
520 return 0;
521
522 if (!strcmp(mcfg->header.oem_id, "SGI"))
523 return 0;
524
525 if (mcfg->header.revision >= 1) {
526 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) &&
527 year >= 2010)
528 return 0;
529 }
530
Bjorn Helgaas8c577862009-11-13 17:34:59 -0700531 printk(KERN_ERR PREFIX "MCFG region for %04x [bus %02x-%02x] at %#llx "
Bjorn Helgaas9a08f7d2009-10-23 15:20:33 -0600532 "is above 4GB, ignored\n", cfg->pci_segment,
533 cfg->start_bus_number, cfg->end_bus_number, cfg->address);
534 return -EINVAL;
Len Brownc4bf2f32009-06-11 23:53:55 -0400535}
536
537static int __init pci_parse_mcfg(struct acpi_table_header *header)
538{
539 struct acpi_table_mcfg *mcfg;
Bjorn Helgaasd3578ef2009-11-13 17:33:47 -0700540 struct acpi_mcfg_allocation *cfg_table, *cfg;
Len Brownc4bf2f32009-06-11 23:53:55 -0400541 unsigned long i;
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700542 int entries;
Len Brownc4bf2f32009-06-11 23:53:55 -0400543
544 if (!header)
545 return -EINVAL;
546
547 mcfg = (struct acpi_table_mcfg *)header;
548
549 /* how many config structures do we have */
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700550 free_all_mmcfg();
Bjorn Helgaase823d6f2009-11-13 17:33:42 -0700551 entries = 0;
Len Brownc4bf2f32009-06-11 23:53:55 -0400552 i = header->length - sizeof(struct acpi_table_mcfg);
553 while (i >= sizeof(struct acpi_mcfg_allocation)) {
Bjorn Helgaase823d6f2009-11-13 17:33:42 -0700554 entries++;
Len Brownc4bf2f32009-06-11 23:53:55 -0400555 i -= sizeof(struct acpi_mcfg_allocation);
556 };
Bjorn Helgaase823d6f2009-11-13 17:33:42 -0700557 if (entries == 0) {
Len Brownc4bf2f32009-06-11 23:53:55 -0400558 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
559 return -ENODEV;
560 }
561
Bjorn Helgaasd3578ef2009-11-13 17:33:47 -0700562 cfg_table = (struct acpi_mcfg_allocation *) &mcfg[1];
Bjorn Helgaase823d6f2009-11-13 17:33:42 -0700563 for (i = 0; i < entries; i++) {
Bjorn Helgaasd3578ef2009-11-13 17:33:47 -0700564 cfg = &cfg_table[i];
565 if (acpi_mcfg_check_entry(mcfg, cfg)) {
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700566 free_all_mmcfg();
Len Brownc4bf2f32009-06-11 23:53:55 -0400567 return -ENODEV;
568 }
Bjorn Helgaas7da7d362009-11-13 17:33:53 -0700569
570 if (pci_mmconfig_add(cfg->pci_segment, cfg->start_bus_number,
571 cfg->end_bus_number, cfg->address) == NULL) {
572 printk(KERN_WARNING PREFIX
573 "no memory for MCFG entries\n");
574 free_all_mmcfg();
575 return -ENOMEM;
576 }
Len Brownc4bf2f32009-06-11 23:53:55 -0400577 }
578
579 return 0;
580}
581
Thomas Gleixner968cbfa2008-05-12 15:43:37 +0200582static void __init __pci_mmcfg_init(int early)
Olivier Galibertb7867392007-02-13 13:26:20 +0100583{
Robert Hancock7752d5c2008-02-15 01:27:20 -0800584 /* MMCONFIG disabled */
585 if ((pci_probe & PCI_PROBE_MMCONF) == 0)
586 return;
587
588 /* MMCONFIG already enabled */
Yinghai Lu05c58b82008-02-15 01:30:14 -0800589 if (!early && !(pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF))
Robert Hancock7752d5c2008-02-15 01:27:20 -0800590 return;
591
Yinghai Lu05c58b82008-02-15 01:30:14 -0800592 /* for late to exit */
593 if (known_bridge)
594 return;
Robert Hancock7752d5c2008-02-15 01:27:20 -0800595
Yinghai Lubb63b422008-02-28 23:56:50 -0800596 if (early) {
Yinghai Lu05c58b82008-02-15 01:30:14 -0800597 if (pci_mmcfg_check_hostbridge())
598 known_bridge = 1;
599 }
600
Yinghai Lu068258b2009-03-19 20:55:35 -0700601 if (!known_bridge)
Feng Tang5f0db7a2009-08-14 15:37:50 -0400602 acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
Yinghai Lu068258b2009-03-19 20:55:35 -0700603
604 pci_mmcfg_reject_broken(early);
Olivier Galibertb7867392007-02-13 13:26:20 +0100605
Bjorn Helgaasff097dd2009-11-13 17:34:49 -0700606 if (list_empty(&pci_mmcfg_list))
Olivier Galibertb7867392007-02-13 13:26:20 +0100607 return;
608
Yinghai Luebd60cd2008-09-04 21:04:32 +0200609 if (pci_mmcfg_arch_init())
Olivier Galibertb7867392007-02-13 13:26:20 +0100610 pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
Yinghai Luebd60cd2008-09-04 21:04:32 +0200611 else {
Aaron Durbina5ba7972007-07-21 17:10:34 +0200612 /*
613 * Signal not to attempt to insert mmcfg resources because
614 * the architecture mmcfg setup could not initialize.
615 */
616 pci_mmcfg_resources_inserted = 1;
Olivier Galibertb7867392007-02-13 13:26:20 +0100617 }
618}
Aaron Durbina5ba7972007-07-21 17:10:34 +0200619
Yinghai Lubb63b422008-02-28 23:56:50 -0800620void __init pci_mmcfg_early_init(void)
Yinghai Lu05c58b82008-02-15 01:30:14 -0800621{
Yinghai Lubb63b422008-02-28 23:56:50 -0800622 __pci_mmcfg_init(1);
Yinghai Lu05c58b82008-02-15 01:30:14 -0800623}
624
625void __init pci_mmcfg_late_init(void)
626{
Yinghai Lubb63b422008-02-28 23:56:50 -0800627 __pci_mmcfg_init(0);
Yinghai Lu05c58b82008-02-15 01:30:14 -0800628}
629
Aaron Durbina5ba7972007-07-21 17:10:34 +0200630static int __init pci_mmcfg_late_insert_resources(void)
631{
632 /*
633 * If resources are already inserted or we are not using MMCONFIG,
634 * don't insert the resources.
635 */
636 if ((pci_mmcfg_resources_inserted == 1) ||
637 (pci_probe & PCI_PROBE_MMCONF) == 0 ||
Bjorn Helgaasff097dd2009-11-13 17:34:49 -0700638 list_empty(&pci_mmcfg_list))
Aaron Durbina5ba7972007-07-21 17:10:34 +0200639 return 1;
640
641 /*
642 * Attempt to insert the mmcfg resources but not with the busy flag
643 * marked so it won't cause request errors when __request_region is
644 * called.
645 */
Yinghai Luebd60cd2008-09-04 21:04:32 +0200646 pci_mmcfg_insert_resources();
Aaron Durbina5ba7972007-07-21 17:10:34 +0200647
648 return 0;
649}
650
651/*
652 * Perform MMCONFIG resource insertion after PCI initialization to allow for
653 * misprogrammed MCFG tables that state larger sizes but actually conflict
654 * with other system resources.
655 */
656late_initcall(pci_mmcfg_late_insert_resources);