Commit | Line | Data |
---|---|---|
b7867394 OG |
1 | /* |
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: | |
9358c693 | 6 | * - known chipset handling |
b7867394 OG |
7 | * - 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> | |
16 | #include <linux/bitmap.h> | |
17 | #include <asm/e820.h> | |
18 | ||
19 | #include "pci.h" | |
20 | ||
21 | /* aperture is up to 256MB but BIOS may reserve less */ | |
22 | #define MMCONFIG_APER_MIN (2 * 1024*1024) | |
23 | #define MMCONFIG_APER_MAX (256 * 1024*1024) | |
24 | ||
a5ba7971 AD |
25 | /* Indicate if the mmcfg resources have been placed into the resource table. */ |
26 | static int __initdata pci_mmcfg_resources_inserted; | |
27 | ||
429d512e | 28 | static const char __init *pci_mmcfg_e7520(void) |
9358c693 OG |
29 | { |
30 | u32 win; | |
b6ce068a | 31 | pci_direct_conf1.read(0, 0, PCI_DEVFN(0,0), 0xce, 2, &win); |
9358c693 | 32 | |
b5229dbb OG |
33 | win = win & 0xf000; |
34 | if(win == 0x0000 || win == 0xf000) | |
35 | pci_mmcfg_config_num = 0; | |
36 | else { | |
37 | pci_mmcfg_config_num = 1; | |
38 | pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL); | |
39 | if (!pci_mmcfg_config) | |
40 | return NULL; | |
41 | pci_mmcfg_config[0].address = win << 16; | |
42 | pci_mmcfg_config[0].pci_segment = 0; | |
43 | pci_mmcfg_config[0].start_bus_number = 0; | |
44 | pci_mmcfg_config[0].end_bus_number = 255; | |
45 | } | |
9358c693 OG |
46 | |
47 | return "Intel Corporation E7520 Memory Controller Hub"; | |
48 | } | |
49 | ||
429d512e | 50 | static const char __init *pci_mmcfg_intel_945(void) |
9358c693 OG |
51 | { |
52 | u32 pciexbar, mask = 0, len = 0; | |
53 | ||
54 | pci_mmcfg_config_num = 1; | |
55 | ||
b6ce068a | 56 | pci_direct_conf1.read(0, 0, PCI_DEVFN(0,0), 0x48, 4, &pciexbar); |
9358c693 OG |
57 | |
58 | /* Enable bit */ | |
59 | if (!(pciexbar & 1)) | |
60 | pci_mmcfg_config_num = 0; | |
61 | ||
62 | /* Size bits */ | |
63 | switch ((pciexbar >> 1) & 3) { | |
64 | case 0: | |
65 | mask = 0xf0000000U; | |
66 | len = 0x10000000U; | |
67 | break; | |
68 | case 1: | |
69 | mask = 0xf8000000U; | |
70 | len = 0x08000000U; | |
71 | break; | |
72 | case 2: | |
73 | mask = 0xfc000000U; | |
74 | len = 0x04000000U; | |
75 | break; | |
76 | default: | |
77 | pci_mmcfg_config_num = 0; | |
78 | } | |
79 | ||
80 | /* Errata #2, things break when not aligned on a 256Mb boundary */ | |
81 | /* Can only happen in 64M/128M mode */ | |
82 | ||
83 | if ((pciexbar & mask) & 0x0fffffffU) | |
84 | pci_mmcfg_config_num = 0; | |
85 | ||
b5229dbb OG |
86 | /* Don't hit the APIC registers and their friends */ |
87 | if ((pciexbar & mask) >= 0xf0000000U) | |
88 | pci_mmcfg_config_num = 0; | |
89 | ||
9358c693 OG |
90 | if (pci_mmcfg_config_num) { |
91 | pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL); | |
92 | if (!pci_mmcfg_config) | |
93 | return NULL; | |
94 | pci_mmcfg_config[0].address = pciexbar & mask; | |
95 | pci_mmcfg_config[0].pci_segment = 0; | |
96 | pci_mmcfg_config[0].start_bus_number = 0; | |
97 | pci_mmcfg_config[0].end_bus_number = (len >> 20) - 1; | |
98 | } | |
99 | ||
100 | return "Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub"; | |
101 | } | |
102 | ||
103 | struct pci_mmcfg_hostbridge_probe { | |
104 | u32 vendor; | |
105 | u32 device; | |
106 | const char *(*probe)(void); | |
107 | }; | |
108 | ||
429d512e | 109 | static struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] __initdata = { |
9358c693 OG |
110 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH, pci_mmcfg_e7520 }, |
111 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82945G_HB, pci_mmcfg_intel_945 }, | |
112 | }; | |
113 | ||
114 | static int __init pci_mmcfg_check_hostbridge(void) | |
115 | { | |
116 | u32 l; | |
117 | u16 vendor, device; | |
118 | int i; | |
119 | const char *name; | |
120 | ||
b6ce068a | 121 | pci_direct_conf1.read(0, 0, PCI_DEVFN(0,0), 0, 4, &l); |
9358c693 OG |
122 | vendor = l & 0xffff; |
123 | device = (l >> 16) & 0xffff; | |
124 | ||
125 | pci_mmcfg_config_num = 0; | |
126 | pci_mmcfg_config = NULL; | |
127 | name = NULL; | |
128 | ||
429d512e OH |
129 | for (i = 0; !name && i < ARRAY_SIZE(pci_mmcfg_probes); i++) { |
130 | if (pci_mmcfg_probes[i].vendor == vendor && | |
131 | pci_mmcfg_probes[i].device == device) | |
9358c693 | 132 | name = pci_mmcfg_probes[i].probe(); |
429d512e | 133 | } |
9358c693 OG |
134 | |
135 | if (name) { | |
429d512e OH |
136 | printk(KERN_INFO "PCI: Found %s %s MMCONFIG support.\n", |
137 | name, pci_mmcfg_config_num ? "with" : "without"); | |
9358c693 OG |
138 | } |
139 | ||
140 | return name != NULL; | |
141 | } | |
142 | ||
a5ba7971 | 143 | static void __init pci_mmcfg_insert_resources(unsigned long resource_flags) |
6a0668fc OG |
144 | { |
145 | #define PCI_MMCFG_RESOURCE_NAME_LEN 19 | |
146 | int i; | |
147 | struct resource *res; | |
148 | char *names; | |
149 | unsigned num_buses; | |
150 | ||
151 | res = kcalloc(PCI_MMCFG_RESOURCE_NAME_LEN + sizeof(*res), | |
152 | pci_mmcfg_config_num, GFP_KERNEL); | |
6a0668fc OG |
153 | if (!res) { |
154 | printk(KERN_ERR "PCI: Unable to allocate MMCONFIG resources\n"); | |
155 | return; | |
156 | } | |
157 | ||
158 | names = (void *)&res[pci_mmcfg_config_num]; | |
159 | for (i = 0; i < pci_mmcfg_config_num; i++, res++) { | |
429d512e OH |
160 | struct acpi_mcfg_allocation *cfg = &pci_mmcfg_config[i]; |
161 | num_buses = cfg->end_bus_number - cfg->start_bus_number + 1; | |
6a0668fc OG |
162 | res->name = names; |
163 | snprintf(names, PCI_MMCFG_RESOURCE_NAME_LEN, "PCI MMCONFIG %u", | |
429d512e OH |
164 | cfg->pci_segment); |
165 | res->start = cfg->address; | |
6a0668fc | 166 | res->end = res->start + (num_buses << 20) - 1; |
a5ba7971 | 167 | res->flags = IORESOURCE_MEM | resource_flags; |
6a0668fc OG |
168 | insert_resource(&iomem_resource, res); |
169 | names += PCI_MMCFG_RESOURCE_NAME_LEN; | |
170 | } | |
a5ba7971 AD |
171 | |
172 | /* Mark that the resources have been inserted. */ | |
173 | pci_mmcfg_resources_inserted = 1; | |
6a0668fc OG |
174 | } |
175 | ||
7752d5cf RH |
176 | static acpi_status __init check_mcfg_resource(struct acpi_resource *res, |
177 | void *data) | |
178 | { | |
179 | struct resource *mcfg_res = data; | |
180 | struct acpi_resource_address64 address; | |
181 | acpi_status status; | |
182 | ||
183 | if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) { | |
184 | struct acpi_resource_fixed_memory32 *fixmem32 = | |
185 | &res->data.fixed_memory32; | |
186 | if (!fixmem32) | |
187 | return AE_OK; | |
188 | if ((mcfg_res->start >= fixmem32->address) && | |
189 | (mcfg_res->end < (fixmem32->address + | |
190 | fixmem32->address_length))) { | |
191 | mcfg_res->flags = 1; | |
192 | return AE_CTRL_TERMINATE; | |
193 | } | |
194 | } | |
195 | if ((res->type != ACPI_RESOURCE_TYPE_ADDRESS32) && | |
196 | (res->type != ACPI_RESOURCE_TYPE_ADDRESS64)) | |
197 | return AE_OK; | |
198 | ||
199 | status = acpi_resource_to_address64(res, &address); | |
200 | if (ACPI_FAILURE(status) || | |
201 | (address.address_length <= 0) || | |
202 | (address.resource_type != ACPI_MEMORY_RANGE)) | |
203 | return AE_OK; | |
204 | ||
205 | if ((mcfg_res->start >= address.minimum) && | |
206 | (mcfg_res->end < (address.minimum + address.address_length))) { | |
207 | mcfg_res->flags = 1; | |
208 | return AE_CTRL_TERMINATE; | |
209 | } | |
210 | return AE_OK; | |
211 | } | |
212 | ||
213 | static acpi_status __init find_mboard_resource(acpi_handle handle, u32 lvl, | |
214 | void *context, void **rv) | |
215 | { | |
216 | struct resource *mcfg_res = context; | |
217 | ||
218 | acpi_walk_resources(handle, METHOD_NAME__CRS, | |
219 | check_mcfg_resource, context); | |
220 | ||
221 | if (mcfg_res->flags) | |
222 | return AE_CTRL_TERMINATE; | |
223 | ||
224 | return AE_OK; | |
225 | } | |
226 | ||
227 | static int __init is_acpi_reserved(unsigned long start, unsigned long end) | |
228 | { | |
229 | struct resource mcfg_res; | |
230 | ||
231 | mcfg_res.start = start; | |
232 | mcfg_res.end = end; | |
233 | mcfg_res.flags = 0; | |
234 | ||
235 | acpi_get_devices("PNP0C01", find_mboard_resource, &mcfg_res, NULL); | |
236 | ||
237 | if (!mcfg_res.flags) | |
238 | acpi_get_devices("PNP0C02", find_mboard_resource, &mcfg_res, | |
239 | NULL); | |
240 | ||
241 | return mcfg_res.flags; | |
242 | } | |
243 | ||
244 | static void __init pci_mmcfg_reject_broken(void) | |
44de0203 | 245 | { |
26054ed0 | 246 | typeof(pci_mmcfg_config[0]) *cfg; |
7752d5cf | 247 | int i; |
26054ed0 OH |
248 | |
249 | if ((pci_mmcfg_config_num == 0) || | |
250 | (pci_mmcfg_config == NULL) || | |
251 | (pci_mmcfg_config[0].address == 0)) | |
252 | return; | |
253 | ||
254 | cfg = &pci_mmcfg_config[0]; | |
44de0203 OH |
255 | |
256 | /* | |
257 | * Handle more broken MCFG tables on Asus etc. | |
258 | * They only contain a single entry for bus 0-0. | |
259 | */ | |
260 | if (pci_mmcfg_config_num == 1 && | |
261 | cfg->pci_segment == 0 && | |
262 | (cfg->start_bus_number | cfg->end_bus_number) == 0) { | |
44de0203 | 263 | printk(KERN_ERR "PCI: start and end of bus number is 0. " |
26054ed0 OH |
264 | "Rejected as broken MCFG.\n"); |
265 | goto reject; | |
266 | } | |
267 | ||
7752d5cf RH |
268 | for (i = 0; i < pci_mmcfg_config_num; i++) { |
269 | u32 size = (cfg->end_bus_number + 1) << 20; | |
270 | cfg = &pci_mmcfg_config[i]; | |
271 | printk(KERN_NOTICE "PCI: MCFG configuration %d: base %lu " | |
272 | "segment %hu buses %u - %u\n", | |
273 | i, (unsigned long)cfg->address, cfg->pci_segment, | |
274 | (unsigned int)cfg->start_bus_number, | |
275 | (unsigned int)cfg->end_bus_number); | |
276 | if (is_acpi_reserved(cfg->address, cfg->address + size - 1)) { | |
277 | printk(KERN_NOTICE "PCI: MCFG area at %Lx reserved " | |
278 | "in ACPI motherboard resources\n", | |
279 | cfg->address); | |
280 | } else { | |
281 | printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %Lx is not" | |
282 | " reserved in ACPI motherboard resources\n", | |
283 | cfg->address); | |
284 | /* Don't try to do this check unless configuration | |
285 | type 1 is available. */ | |
286 | if ((pci_probe & PCI_PROBE_CONF1) && | |
287 | e820_all_mapped(cfg->address, | |
288 | cfg->address + size - 1, | |
289 | E820_RESERVED)) | |
290 | printk(KERN_NOTICE | |
291 | "PCI: MCFG area at %Lx reserved in " | |
292 | "E820\n", | |
293 | cfg->address); | |
294 | else | |
295 | goto reject; | |
296 | } | |
44de0203 | 297 | } |
7752d5cf | 298 | |
26054ed0 OH |
299 | return; |
300 | ||
301 | reject: | |
302 | printk(KERN_ERR "PCI: Not using MMCONFIG.\n"); | |
0b64ad71 | 303 | pci_mmcfg_arch_free(); |
26054ed0 OH |
304 | kfree(pci_mmcfg_config); |
305 | pci_mmcfg_config = NULL; | |
306 | pci_mmcfg_config_num = 0; | |
44de0203 OH |
307 | } |
308 | ||
7752d5cf RH |
309 | void __init pci_mmcfg_early_init(int type) |
310 | { | |
311 | if ((pci_probe & PCI_PROBE_MMCONF) == 0) | |
312 | return; | |
313 | ||
314 | /* If type 1 access is available, no need to enable MMCONFIG yet, we can | |
315 | defer until later when the ACPI interpreter is available to better | |
316 | validate things. */ | |
317 | if (type == 1) | |
318 | return; | |
319 | ||
320 | acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg); | |
321 | ||
322 | if ((pci_mmcfg_config_num == 0) || | |
323 | (pci_mmcfg_config == NULL) || | |
324 | (pci_mmcfg_config[0].address == 0)) | |
325 | return; | |
326 | ||
327 | if (pci_mmcfg_arch_init()) | |
328 | pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF; | |
329 | } | |
330 | ||
331 | void __init pci_mmcfg_late_init(void) | |
b7867394 | 332 | { |
9358c693 OG |
333 | int known_bridge = 0; |
334 | ||
7752d5cf | 335 | /* MMCONFIG disabled */ |
b7867394 OG |
336 | if ((pci_probe & PCI_PROBE_MMCONF) == 0) |
337 | return; | |
338 | ||
7752d5cf RH |
339 | /* MMCONFIG already enabled */ |
340 | if (!(pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF)) | |
341 | return; | |
9358c693 | 342 | |
7752d5cf RH |
343 | if ((pci_probe & PCI_PROBE_CONF1) && pci_mmcfg_check_hostbridge()) |
344 | known_bridge = 1; | |
345 | else | |
9358c693 | 346 | acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg); |
7752d5cf RH |
347 | |
348 | pci_mmcfg_reject_broken(); | |
b7867394 OG |
349 | |
350 | if ((pci_mmcfg_config_num == 0) || | |
351 | (pci_mmcfg_config == NULL) || | |
352 | (pci_mmcfg_config[0].address == 0)) | |
353 | return; | |
354 | ||
b7867394 | 355 | if (pci_mmcfg_arch_init()) { |
6a0668fc | 356 | if (known_bridge) |
a5ba7971 | 357 | pci_mmcfg_insert_resources(IORESOURCE_BUSY); |
b7867394 | 358 | pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF; |
a5ba7971 AD |
359 | } else { |
360 | /* | |
361 | * Signal not to attempt to insert mmcfg resources because | |
362 | * the architecture mmcfg setup could not initialize. | |
363 | */ | |
364 | pci_mmcfg_resources_inserted = 1; | |
b7867394 OG |
365 | } |
366 | } | |
a5ba7971 AD |
367 | |
368 | static int __init pci_mmcfg_late_insert_resources(void) | |
369 | { | |
370 | /* | |
371 | * If resources are already inserted or we are not using MMCONFIG, | |
372 | * don't insert the resources. | |
373 | */ | |
374 | if ((pci_mmcfg_resources_inserted == 1) || | |
375 | (pci_probe & PCI_PROBE_MMCONF) == 0 || | |
376 | (pci_mmcfg_config_num == 0) || | |
377 | (pci_mmcfg_config == NULL) || | |
378 | (pci_mmcfg_config[0].address == 0)) | |
379 | return 1; | |
380 | ||
381 | /* | |
382 | * Attempt to insert the mmcfg resources but not with the busy flag | |
383 | * marked so it won't cause request errors when __request_region is | |
384 | * called. | |
385 | */ | |
386 | pci_mmcfg_insert_resources(0); | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Perform MMCONFIG resource insertion after PCI initialization to allow for | |
393 | * misprogrammed MCFG tables that state larger sizes but actually conflict | |
394 | * with other system resources. | |
395 | */ | |
396 | late_initcall(pci_mmcfg_late_insert_resources); |