Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * probe.c - PCI detection and setup code | |
3 | */ | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | #include <linux/delay.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/pci.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/cpumask.h> | |
7d715a6c | 12 | #include <linux/pci-aspm.h> |
284f5f9d | 13 | #include <asm-generic/pci-bridge.h> |
bc56b9e0 | 14 | #include "pci.h" |
1da177e4 LT |
15 | |
16 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ | |
17 | #define CARDBUS_RESERVE_BUSNR 3 | |
1da177e4 | 18 | |
0b950f0f | 19 | static struct resource busn_resource = { |
67cdc827 YL |
20 | .name = "PCI busn", |
21 | .start = 0, | |
22 | .end = 255, | |
23 | .flags = IORESOURCE_BUS, | |
24 | }; | |
25 | ||
1da177e4 LT |
26 | /* Ugh. Need to stop exporting this to modules. */ |
27 | LIST_HEAD(pci_root_buses); | |
28 | EXPORT_SYMBOL(pci_root_buses); | |
29 | ||
5cc62c20 YL |
30 | static LIST_HEAD(pci_domain_busn_res_list); |
31 | ||
32 | struct pci_domain_busn_res { | |
33 | struct list_head list; | |
34 | struct resource res; | |
35 | int domain_nr; | |
36 | }; | |
37 | ||
38 | static struct resource *get_pci_domain_busn_res(int domain_nr) | |
39 | { | |
40 | struct pci_domain_busn_res *r; | |
41 | ||
42 | list_for_each_entry(r, &pci_domain_busn_res_list, list) | |
43 | if (r->domain_nr == domain_nr) | |
44 | return &r->res; | |
45 | ||
46 | r = kzalloc(sizeof(*r), GFP_KERNEL); | |
47 | if (!r) | |
48 | return NULL; | |
49 | ||
50 | r->domain_nr = domain_nr; | |
51 | r->res.start = 0; | |
52 | r->res.end = 0xff; | |
53 | r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED; | |
54 | ||
55 | list_add_tail(&r->list, &pci_domain_busn_res_list); | |
56 | ||
57 | return &r->res; | |
58 | } | |
59 | ||
70308923 GKH |
60 | static int find_anything(struct device *dev, void *data) |
61 | { | |
62 | return 1; | |
63 | } | |
1da177e4 | 64 | |
ed4aaadb ZY |
65 | /* |
66 | * Some device drivers need know if pci is initiated. | |
67 | * Basically, we think pci is not initiated when there | |
70308923 | 68 | * is no device to be found on the pci_bus_type. |
ed4aaadb ZY |
69 | */ |
70 | int no_pci_devices(void) | |
71 | { | |
70308923 GKH |
72 | struct device *dev; |
73 | int no_devices; | |
ed4aaadb | 74 | |
70308923 GKH |
75 | dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); |
76 | no_devices = (dev == NULL); | |
77 | put_device(dev); | |
78 | return no_devices; | |
79 | } | |
ed4aaadb ZY |
80 | EXPORT_SYMBOL(no_pci_devices); |
81 | ||
1da177e4 LT |
82 | /* |
83 | * PCI Bus Class | |
84 | */ | |
fd7d1ced | 85 | static void release_pcibus_dev(struct device *dev) |
1da177e4 | 86 | { |
fd7d1ced | 87 | struct pci_bus *pci_bus = to_pci_bus(dev); |
1da177e4 LT |
88 | |
89 | if (pci_bus->bridge) | |
90 | put_device(pci_bus->bridge); | |
2fe2abf8 | 91 | pci_bus_remove_resources(pci_bus); |
98d9f30c | 92 | pci_release_bus_of_node(pci_bus); |
1da177e4 LT |
93 | kfree(pci_bus); |
94 | } | |
95 | ||
96 | static struct class pcibus_class = { | |
97 | .name = "pci_bus", | |
fd7d1ced | 98 | .dev_release = &release_pcibus_dev, |
56039e65 | 99 | .dev_groups = pcibus_groups, |
1da177e4 LT |
100 | }; |
101 | ||
102 | static int __init pcibus_class_init(void) | |
103 | { | |
104 | return class_register(&pcibus_class); | |
105 | } | |
106 | postcore_initcall(pcibus_class_init); | |
107 | ||
6ac665c6 | 108 | static u64 pci_size(u64 base, u64 maxbase, u64 mask) |
1da177e4 | 109 | { |
6ac665c6 | 110 | u64 size = mask & maxbase; /* Find the significant bits */ |
1da177e4 LT |
111 | if (!size) |
112 | return 0; | |
113 | ||
114 | /* Get the lowest of them to find the decode size, and | |
115 | from that the extent. */ | |
116 | size = (size & ~(size-1)) - 1; | |
117 | ||
118 | /* base == maxbase can be valid only if the BAR has | |
119 | already been programmed with all 1s. */ | |
120 | if (base == maxbase && ((base | size) & mask) != mask) | |
121 | return 0; | |
122 | ||
123 | return size; | |
124 | } | |
125 | ||
28c6821a | 126 | static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar) |
6ac665c6 | 127 | { |
8d6a6a47 | 128 | u32 mem_type; |
28c6821a | 129 | unsigned long flags; |
8d6a6a47 | 130 | |
6ac665c6 | 131 | if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { |
28c6821a BH |
132 | flags = bar & ~PCI_BASE_ADDRESS_IO_MASK; |
133 | flags |= IORESOURCE_IO; | |
134 | return flags; | |
6ac665c6 | 135 | } |
07eddf3d | 136 | |
28c6821a BH |
137 | flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK; |
138 | flags |= IORESOURCE_MEM; | |
139 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) | |
140 | flags |= IORESOURCE_PREFETCH; | |
07eddf3d | 141 | |
8d6a6a47 BH |
142 | mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK; |
143 | switch (mem_type) { | |
144 | case PCI_BASE_ADDRESS_MEM_TYPE_32: | |
145 | break; | |
146 | case PCI_BASE_ADDRESS_MEM_TYPE_1M: | |
0ff9514b | 147 | /* 1M mem BAR treated as 32-bit BAR */ |
8d6a6a47 BH |
148 | break; |
149 | case PCI_BASE_ADDRESS_MEM_TYPE_64: | |
28c6821a BH |
150 | flags |= IORESOURCE_MEM_64; |
151 | break; | |
8d6a6a47 | 152 | default: |
0ff9514b | 153 | /* mem unknown type treated as 32-bit BAR */ |
8d6a6a47 BH |
154 | break; |
155 | } | |
28c6821a | 156 | return flags; |
07eddf3d YL |
157 | } |
158 | ||
808e34e2 ZK |
159 | #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO) |
160 | ||
0b400c7e YZ |
161 | /** |
162 | * pci_read_base - read a PCI BAR | |
163 | * @dev: the PCI device | |
164 | * @type: type of the BAR | |
165 | * @res: resource buffer to be filled in | |
166 | * @pos: BAR position in the config space | |
167 | * | |
168 | * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. | |
6ac665c6 | 169 | */ |
0b400c7e | 170 | int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, |
3c78bc61 | 171 | struct resource *res, unsigned int pos) |
07eddf3d | 172 | { |
6ac665c6 | 173 | u32 l, sz, mask; |
23b13bc7 | 174 | u64 l64, sz64, mask64; |
253d2e54 | 175 | u16 orig_cmd; |
cf4d1cf5 | 176 | struct pci_bus_region region, inverted_region; |
26370fc6 | 177 | bool bar_too_big = false, bar_too_high = false, bar_invalid = false; |
6ac665c6 | 178 | |
1ed67439 | 179 | mask = type ? PCI_ROM_ADDRESS_MASK : ~0; |
6ac665c6 | 180 | |
0ff9514b | 181 | /* No printks while decoding is disabled! */ |
253d2e54 JP |
182 | if (!dev->mmio_always_on) { |
183 | pci_read_config_word(dev, PCI_COMMAND, &orig_cmd); | |
808e34e2 ZK |
184 | if (orig_cmd & PCI_COMMAND_DECODE_ENABLE) { |
185 | pci_write_config_word(dev, PCI_COMMAND, | |
186 | orig_cmd & ~PCI_COMMAND_DECODE_ENABLE); | |
187 | } | |
253d2e54 JP |
188 | } |
189 | ||
6ac665c6 MW |
190 | res->name = pci_name(dev); |
191 | ||
192 | pci_read_config_dword(dev, pos, &l); | |
1ed67439 | 193 | pci_write_config_dword(dev, pos, l | mask); |
6ac665c6 MW |
194 | pci_read_config_dword(dev, pos, &sz); |
195 | pci_write_config_dword(dev, pos, l); | |
196 | ||
197 | /* | |
198 | * All bits set in sz means the device isn't working properly. | |
45aa23b4 BH |
199 | * If the BAR isn't implemented, all bits must be 0. If it's a |
200 | * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit | |
201 | * 1 must be clear. | |
6ac665c6 | 202 | */ |
45aa23b4 | 203 | if (!sz || sz == 0xffffffff) |
6ac665c6 MW |
204 | goto fail; |
205 | ||
206 | /* | |
207 | * I don't know how l can have all bits set. Copied from old code. | |
208 | * Maybe it fixes a bug on some ancient platform. | |
209 | */ | |
210 | if (l == 0xffffffff) | |
211 | l = 0; | |
212 | ||
213 | if (type == pci_bar_unknown) { | |
28c6821a BH |
214 | res->flags = decode_bar(dev, l); |
215 | res->flags |= IORESOURCE_SIZEALIGN; | |
216 | if (res->flags & IORESOURCE_IO) { | |
6ac665c6 | 217 | l &= PCI_BASE_ADDRESS_IO_MASK; |
5aceca9d | 218 | mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT; |
6ac665c6 MW |
219 | } else { |
220 | l &= PCI_BASE_ADDRESS_MEM_MASK; | |
221 | mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; | |
222 | } | |
223 | } else { | |
224 | res->flags |= (l & IORESOURCE_ROM_ENABLE); | |
225 | l &= PCI_ROM_ADDRESS_MASK; | |
226 | mask = (u32)PCI_ROM_ADDRESS_MASK; | |
227 | } | |
228 | ||
28c6821a | 229 | if (res->flags & IORESOURCE_MEM_64) { |
23b13bc7 BH |
230 | l64 = l; |
231 | sz64 = sz; | |
232 | mask64 = mask | (u64)~0 << 32; | |
6ac665c6 MW |
233 | |
234 | pci_read_config_dword(dev, pos + 4, &l); | |
235 | pci_write_config_dword(dev, pos + 4, ~0); | |
236 | pci_read_config_dword(dev, pos + 4, &sz); | |
237 | pci_write_config_dword(dev, pos + 4, l); | |
238 | ||
239 | l64 |= ((u64)l << 32); | |
240 | sz64 |= ((u64)sz << 32); | |
241 | ||
242 | sz64 = pci_size(l64, sz64, mask64); | |
243 | ||
244 | if (!sz64) | |
245 | goto fail; | |
246 | ||
23b13bc7 BH |
247 | if ((sizeof(dma_addr_t) < 8 || sizeof(resource_size_t) < 8) && |
248 | sz64 > 0x100000000ULL) { | |
249 | res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED; | |
250 | res->start = 0; | |
251 | res->end = 0; | |
0ff9514b | 252 | bar_too_big = true; |
23b13bc7 | 253 | goto out; |
c7dabef8 BH |
254 | } |
255 | ||
d1a313e4 | 256 | if ((sizeof(dma_addr_t) < 8) && l) { |
31e9dd25 | 257 | /* Above 32-bit boundary; try to reallocate */ |
c83bd900 | 258 | res->flags |= IORESOURCE_UNSET; |
72dc5601 BH |
259 | res->start = 0; |
260 | res->end = sz64; | |
31e9dd25 | 261 | bar_too_high = true; |
72dc5601 | 262 | goto out; |
6ac665c6 | 263 | } else { |
5bfa14ed BH |
264 | region.start = l64; |
265 | region.end = l64 + sz64; | |
6ac665c6 MW |
266 | } |
267 | } else { | |
45aa23b4 | 268 | sz = pci_size(l, sz, mask); |
6ac665c6 | 269 | |
45aa23b4 | 270 | if (!sz) |
6ac665c6 MW |
271 | goto fail; |
272 | ||
5bfa14ed BH |
273 | region.start = l; |
274 | region.end = l + sz; | |
6ac665c6 MW |
275 | } |
276 | ||
fc279850 YL |
277 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
278 | pcibios_resource_to_bus(dev->bus, &inverted_region, res); | |
cf4d1cf5 KH |
279 | |
280 | /* | |
281 | * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is | |
282 | * the corresponding resource address (the physical address used by | |
283 | * the CPU. Converting that resource address back to a bus address | |
284 | * should yield the original BAR value: | |
285 | * | |
286 | * resource_to_bus(bus_to_resource(A)) == A | |
287 | * | |
288 | * If it doesn't, CPU accesses to "bus_to_resource(A)" will not | |
289 | * be claimed by the device. | |
290 | */ | |
291 | if (inverted_region.start != region.start) { | |
cf4d1cf5 | 292 | res->flags |= IORESOURCE_UNSET; |
cf4d1cf5 | 293 | res->start = 0; |
26370fc6 BH |
294 | res->end = region.end - region.start; |
295 | bar_invalid = true; | |
cf4d1cf5 | 296 | } |
96ddef25 | 297 | |
0ff9514b BH |
298 | goto out; |
299 | ||
300 | ||
301 | fail: | |
302 | res->flags = 0; | |
303 | out: | |
808e34e2 ZK |
304 | if (!dev->mmio_always_on && |
305 | (orig_cmd & PCI_COMMAND_DECODE_ENABLE)) | |
bbffe435 BH |
306 | pci_write_config_word(dev, PCI_COMMAND, orig_cmd); |
307 | ||
0ff9514b | 308 | if (bar_too_big) |
23b13bc7 BH |
309 | dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n", |
310 | pos, (unsigned long long) sz64); | |
31e9dd25 BH |
311 | if (bar_too_high) |
312 | dev_info(&dev->dev, "reg 0x%x: can't handle BAR above 4G (bus address %#010llx)\n", | |
313 | pos, (unsigned long long) l64); | |
26370fc6 BH |
314 | if (bar_invalid) |
315 | dev_info(&dev->dev, "reg 0x%x: initial BAR value %#010llx invalid\n", | |
316 | pos, (unsigned long long) region.start); | |
31e9dd25 | 317 | if (res->flags) |
33963e30 | 318 | dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res); |
0ff9514b | 319 | |
28c6821a | 320 | return (res->flags & IORESOURCE_MEM_64) ? 1 : 0; |
07eddf3d YL |
321 | } |
322 | ||
1da177e4 LT |
323 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
324 | { | |
6ac665c6 | 325 | unsigned int pos, reg; |
07eddf3d | 326 | |
6ac665c6 MW |
327 | for (pos = 0; pos < howmany; pos++) { |
328 | struct resource *res = &dev->resource[pos]; | |
1da177e4 | 329 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); |
6ac665c6 | 330 | pos += __pci_read_base(dev, pci_bar_unknown, res, reg); |
1da177e4 | 331 | } |
6ac665c6 | 332 | |
1da177e4 | 333 | if (rom) { |
6ac665c6 | 334 | struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; |
1da177e4 | 335 | dev->rom_base_reg = rom; |
6ac665c6 MW |
336 | res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | |
337 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE | | |
338 | IORESOURCE_SIZEALIGN; | |
339 | __pci_read_base(dev, pci_bar_mem32, res, rom); | |
1da177e4 LT |
340 | } |
341 | } | |
342 | ||
15856ad5 | 343 | static void pci_read_bridge_io(struct pci_bus *child) |
1da177e4 LT |
344 | { |
345 | struct pci_dev *dev = child->self; | |
346 | u8 io_base_lo, io_limit_lo; | |
2b28ae19 | 347 | unsigned long io_mask, io_granularity, base, limit; |
5bfa14ed | 348 | struct pci_bus_region region; |
2b28ae19 BH |
349 | struct resource *res; |
350 | ||
351 | io_mask = PCI_IO_RANGE_MASK; | |
352 | io_granularity = 0x1000; | |
353 | if (dev->io_window_1k) { | |
354 | /* Support 1K I/O space granularity */ | |
355 | io_mask = PCI_IO_1K_RANGE_MASK; | |
356 | io_granularity = 0x400; | |
357 | } | |
1da177e4 | 358 | |
1da177e4 LT |
359 | res = child->resource[0]; |
360 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); | |
361 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); | |
2b28ae19 BH |
362 | base = (io_base_lo & io_mask) << 8; |
363 | limit = (io_limit_lo & io_mask) << 8; | |
1da177e4 LT |
364 | |
365 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { | |
366 | u16 io_base_hi, io_limit_hi; | |
8f38eaca | 367 | |
1da177e4 LT |
368 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); |
369 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); | |
8f38eaca BH |
370 | base |= ((unsigned long) io_base_hi << 16); |
371 | limit |= ((unsigned long) io_limit_hi << 16); | |
1da177e4 LT |
372 | } |
373 | ||
5dde383e | 374 | if (base <= limit) { |
1da177e4 | 375 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; |
5bfa14ed | 376 | region.start = base; |
2b28ae19 | 377 | region.end = limit + io_granularity - 1; |
fc279850 | 378 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
c7dabef8 | 379 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 | 380 | } |
fa27b2d1 BH |
381 | } |
382 | ||
15856ad5 | 383 | static void pci_read_bridge_mmio(struct pci_bus *child) |
fa27b2d1 BH |
384 | { |
385 | struct pci_dev *dev = child->self; | |
386 | u16 mem_base_lo, mem_limit_lo; | |
387 | unsigned long base, limit; | |
5bfa14ed | 388 | struct pci_bus_region region; |
fa27b2d1 | 389 | struct resource *res; |
1da177e4 LT |
390 | |
391 | res = child->resource[1]; | |
392 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); | |
393 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); | |
8f38eaca BH |
394 | base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; |
395 | limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
5dde383e | 396 | if (base <= limit) { |
1da177e4 | 397 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; |
5bfa14ed BH |
398 | region.start = base; |
399 | region.end = limit + 0xfffff; | |
fc279850 | 400 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
c7dabef8 | 401 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 | 402 | } |
fa27b2d1 BH |
403 | } |
404 | ||
15856ad5 | 405 | static void pci_read_bridge_mmio_pref(struct pci_bus *child) |
fa27b2d1 BH |
406 | { |
407 | struct pci_dev *dev = child->self; | |
408 | u16 mem_base_lo, mem_limit_lo; | |
409 | unsigned long base, limit; | |
5bfa14ed | 410 | struct pci_bus_region region; |
fa27b2d1 | 411 | struct resource *res; |
1da177e4 LT |
412 | |
413 | res = child->resource[2]; | |
414 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); | |
415 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); | |
8f38eaca BH |
416 | base = ((unsigned long) mem_base_lo & PCI_PREF_RANGE_MASK) << 16; |
417 | limit = ((unsigned long) mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; | |
1da177e4 LT |
418 | |
419 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { | |
420 | u32 mem_base_hi, mem_limit_hi; | |
8f38eaca | 421 | |
1da177e4 LT |
422 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); |
423 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); | |
424 | ||
425 | /* | |
426 | * Some bridges set the base > limit by default, and some | |
427 | * (broken) BIOSes do not initialize them. If we find | |
428 | * this, just assume they are not being used. | |
429 | */ | |
430 | if (mem_base_hi <= mem_limit_hi) { | |
431 | #if BITS_PER_LONG == 64 | |
8f38eaca BH |
432 | base |= ((unsigned long) mem_base_hi) << 32; |
433 | limit |= ((unsigned long) mem_limit_hi) << 32; | |
1da177e4 LT |
434 | #else |
435 | if (mem_base_hi || mem_limit_hi) { | |
227f0647 | 436 | dev_err(&dev->dev, "can't handle 64-bit address space for bridge\n"); |
1da177e4 LT |
437 | return; |
438 | } | |
439 | #endif | |
440 | } | |
441 | } | |
5dde383e | 442 | if (base <= limit) { |
1f82de10 YL |
443 | res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | |
444 | IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
445 | if (res->flags & PCI_PREF_RANGE_TYPE_64) | |
446 | res->flags |= IORESOURCE_MEM_64; | |
5bfa14ed BH |
447 | region.start = base; |
448 | region.end = limit + 0xfffff; | |
fc279850 | 449 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
c7dabef8 | 450 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 LT |
451 | } |
452 | } | |
453 | ||
15856ad5 | 454 | void pci_read_bridge_bases(struct pci_bus *child) |
fa27b2d1 BH |
455 | { |
456 | struct pci_dev *dev = child->self; | |
2fe2abf8 | 457 | struct resource *res; |
fa27b2d1 BH |
458 | int i; |
459 | ||
460 | if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ | |
461 | return; | |
462 | ||
b918c62e YL |
463 | dev_info(&dev->dev, "PCI bridge to %pR%s\n", |
464 | &child->busn_res, | |
fa27b2d1 BH |
465 | dev->transparent ? " (subtractive decode)" : ""); |
466 | ||
2fe2abf8 BH |
467 | pci_bus_remove_resources(child); |
468 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
469 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; | |
470 | ||
fa27b2d1 BH |
471 | pci_read_bridge_io(child); |
472 | pci_read_bridge_mmio(child); | |
473 | pci_read_bridge_mmio_pref(child); | |
2adf7516 BH |
474 | |
475 | if (dev->transparent) { | |
2fe2abf8 | 476 | pci_bus_for_each_resource(child->parent, res, i) { |
d739a099 | 477 | if (res && res->flags) { |
2fe2abf8 BH |
478 | pci_bus_add_resource(child, res, |
479 | PCI_SUBTRACTIVE_DECODE); | |
2adf7516 BH |
480 | dev_printk(KERN_DEBUG, &dev->dev, |
481 | " bridge window %pR (subtractive decode)\n", | |
2fe2abf8 BH |
482 | res); |
483 | } | |
2adf7516 BH |
484 | } |
485 | } | |
fa27b2d1 BH |
486 | } |
487 | ||
05013486 | 488 | static struct pci_bus *pci_alloc_bus(void) |
1da177e4 LT |
489 | { |
490 | struct pci_bus *b; | |
491 | ||
f5afe806 | 492 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
05013486 BH |
493 | if (!b) |
494 | return NULL; | |
495 | ||
496 | INIT_LIST_HEAD(&b->node); | |
497 | INIT_LIST_HEAD(&b->children); | |
498 | INIT_LIST_HEAD(&b->devices); | |
499 | INIT_LIST_HEAD(&b->slots); | |
500 | INIT_LIST_HEAD(&b->resources); | |
501 | b->max_bus_speed = PCI_SPEED_UNKNOWN; | |
502 | b->cur_bus_speed = PCI_SPEED_UNKNOWN; | |
1da177e4 LT |
503 | return b; |
504 | } | |
505 | ||
70efde2a JL |
506 | static void pci_release_host_bridge_dev(struct device *dev) |
507 | { | |
508 | struct pci_host_bridge *bridge = to_pci_host_bridge(dev); | |
509 | ||
510 | if (bridge->release_fn) | |
511 | bridge->release_fn(bridge); | |
512 | ||
513 | pci_free_resource_list(&bridge->windows); | |
514 | ||
515 | kfree(bridge); | |
516 | } | |
517 | ||
7b543663 YL |
518 | static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) |
519 | { | |
520 | struct pci_host_bridge *bridge; | |
521 | ||
522 | bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); | |
05013486 BH |
523 | if (!bridge) |
524 | return NULL; | |
7b543663 | 525 | |
05013486 BH |
526 | INIT_LIST_HEAD(&bridge->windows); |
527 | bridge->bus = b; | |
7b543663 YL |
528 | return bridge; |
529 | } | |
530 | ||
0b950f0f | 531 | static const unsigned char pcix_bus_speed[] = { |
9be60ca0 MW |
532 | PCI_SPEED_UNKNOWN, /* 0 */ |
533 | PCI_SPEED_66MHz_PCIX, /* 1 */ | |
534 | PCI_SPEED_100MHz_PCIX, /* 2 */ | |
535 | PCI_SPEED_133MHz_PCIX, /* 3 */ | |
536 | PCI_SPEED_UNKNOWN, /* 4 */ | |
537 | PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ | |
538 | PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ | |
539 | PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ | |
540 | PCI_SPEED_UNKNOWN, /* 8 */ | |
541 | PCI_SPEED_66MHz_PCIX_266, /* 9 */ | |
542 | PCI_SPEED_100MHz_PCIX_266, /* A */ | |
543 | PCI_SPEED_133MHz_PCIX_266, /* B */ | |
544 | PCI_SPEED_UNKNOWN, /* C */ | |
545 | PCI_SPEED_66MHz_PCIX_533, /* D */ | |
546 | PCI_SPEED_100MHz_PCIX_533, /* E */ | |
547 | PCI_SPEED_133MHz_PCIX_533 /* F */ | |
548 | }; | |
549 | ||
343e51ae | 550 | const unsigned char pcie_link_speed[] = { |
3749c51a MW |
551 | PCI_SPEED_UNKNOWN, /* 0 */ |
552 | PCIE_SPEED_2_5GT, /* 1 */ | |
553 | PCIE_SPEED_5_0GT, /* 2 */ | |
9dfd97fe | 554 | PCIE_SPEED_8_0GT, /* 3 */ |
3749c51a MW |
555 | PCI_SPEED_UNKNOWN, /* 4 */ |
556 | PCI_SPEED_UNKNOWN, /* 5 */ | |
557 | PCI_SPEED_UNKNOWN, /* 6 */ | |
558 | PCI_SPEED_UNKNOWN, /* 7 */ | |
559 | PCI_SPEED_UNKNOWN, /* 8 */ | |
560 | PCI_SPEED_UNKNOWN, /* 9 */ | |
561 | PCI_SPEED_UNKNOWN, /* A */ | |
562 | PCI_SPEED_UNKNOWN, /* B */ | |
563 | PCI_SPEED_UNKNOWN, /* C */ | |
564 | PCI_SPEED_UNKNOWN, /* D */ | |
565 | PCI_SPEED_UNKNOWN, /* E */ | |
566 | PCI_SPEED_UNKNOWN /* F */ | |
567 | }; | |
568 | ||
569 | void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) | |
570 | { | |
231afea1 | 571 | bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS]; |
3749c51a MW |
572 | } |
573 | EXPORT_SYMBOL_GPL(pcie_update_link_speed); | |
574 | ||
45b4cdd5 MW |
575 | static unsigned char agp_speeds[] = { |
576 | AGP_UNKNOWN, | |
577 | AGP_1X, | |
578 | AGP_2X, | |
579 | AGP_4X, | |
580 | AGP_8X | |
581 | }; | |
582 | ||
583 | static enum pci_bus_speed agp_speed(int agp3, int agpstat) | |
584 | { | |
585 | int index = 0; | |
586 | ||
587 | if (agpstat & 4) | |
588 | index = 3; | |
589 | else if (agpstat & 2) | |
590 | index = 2; | |
591 | else if (agpstat & 1) | |
592 | index = 1; | |
593 | else | |
594 | goto out; | |
f7625980 | 595 | |
45b4cdd5 MW |
596 | if (agp3) { |
597 | index += 2; | |
598 | if (index == 5) | |
599 | index = 0; | |
600 | } | |
601 | ||
602 | out: | |
603 | return agp_speeds[index]; | |
604 | } | |
605 | ||
9be60ca0 MW |
606 | static void pci_set_bus_speed(struct pci_bus *bus) |
607 | { | |
608 | struct pci_dev *bridge = bus->self; | |
609 | int pos; | |
610 | ||
45b4cdd5 MW |
611 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); |
612 | if (!pos) | |
613 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); | |
614 | if (pos) { | |
615 | u32 agpstat, agpcmd; | |
616 | ||
617 | pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); | |
618 | bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); | |
619 | ||
620 | pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); | |
621 | bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); | |
622 | } | |
623 | ||
9be60ca0 MW |
624 | pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); |
625 | if (pos) { | |
626 | u16 status; | |
627 | enum pci_bus_speed max; | |
9be60ca0 | 628 | |
7793eeab BH |
629 | pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS, |
630 | &status); | |
631 | ||
632 | if (status & PCI_X_SSTATUS_533MHZ) { | |
9be60ca0 | 633 | max = PCI_SPEED_133MHz_PCIX_533; |
7793eeab | 634 | } else if (status & PCI_X_SSTATUS_266MHZ) { |
9be60ca0 | 635 | max = PCI_SPEED_133MHz_PCIX_266; |
7793eeab | 636 | } else if (status & PCI_X_SSTATUS_133MHZ) { |
3c78bc61 | 637 | if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) |
9be60ca0 | 638 | max = PCI_SPEED_133MHz_PCIX_ECC; |
3c78bc61 | 639 | else |
9be60ca0 | 640 | max = PCI_SPEED_133MHz_PCIX; |
9be60ca0 MW |
641 | } else { |
642 | max = PCI_SPEED_66MHz_PCIX; | |
643 | } | |
644 | ||
645 | bus->max_bus_speed = max; | |
7793eeab BH |
646 | bus->cur_bus_speed = pcix_bus_speed[ |
647 | (status & PCI_X_SSTATUS_FREQ) >> 6]; | |
9be60ca0 MW |
648 | |
649 | return; | |
650 | } | |
651 | ||
fdfe1511 | 652 | if (pci_is_pcie(bridge)) { |
9be60ca0 MW |
653 | u32 linkcap; |
654 | u16 linksta; | |
655 | ||
59875ae4 | 656 | pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap); |
231afea1 | 657 | bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS]; |
9be60ca0 | 658 | |
59875ae4 | 659 | pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta); |
9be60ca0 MW |
660 | pcie_update_link_speed(bus, linksta); |
661 | } | |
662 | } | |
663 | ||
cbd4e055 AB |
664 | static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, |
665 | struct pci_dev *bridge, int busnr) | |
1da177e4 LT |
666 | { |
667 | struct pci_bus *child; | |
668 | int i; | |
4f535093 | 669 | int ret; |
1da177e4 LT |
670 | |
671 | /* | |
672 | * Allocate a new bus, and inherit stuff from the parent.. | |
673 | */ | |
674 | child = pci_alloc_bus(); | |
675 | if (!child) | |
676 | return NULL; | |
677 | ||
1da177e4 LT |
678 | child->parent = parent; |
679 | child->ops = parent->ops; | |
0cbdcfcf | 680 | child->msi = parent->msi; |
1da177e4 | 681 | child->sysdata = parent->sysdata; |
6e325a62 | 682 | child->bus_flags = parent->bus_flags; |
1da177e4 | 683 | |
fd7d1ced | 684 | /* initialize some portions of the bus device, but don't register it |
4f535093 | 685 | * now as the parent is not properly set up yet. |
fd7d1ced GKH |
686 | */ |
687 | child->dev.class = &pcibus_class; | |
1a927133 | 688 | dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); |
1da177e4 LT |
689 | |
690 | /* | |
691 | * Set up the primary, secondary and subordinate | |
692 | * bus numbers. | |
693 | */ | |
b918c62e YL |
694 | child->number = child->busn_res.start = busnr; |
695 | child->primary = parent->busn_res.start; | |
696 | child->busn_res.end = 0xff; | |
1da177e4 | 697 | |
4f535093 YL |
698 | if (!bridge) { |
699 | child->dev.parent = parent->bridge; | |
700 | goto add_dev; | |
701 | } | |
3789fa8a YZ |
702 | |
703 | child->self = bridge; | |
704 | child->bridge = get_device(&bridge->dev); | |
4f535093 | 705 | child->dev.parent = child->bridge; |
98d9f30c | 706 | pci_set_bus_of_node(child); |
9be60ca0 MW |
707 | pci_set_bus_speed(child); |
708 | ||
1da177e4 | 709 | /* Set up default resource pointers and names.. */ |
fde09c6d | 710 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { |
1da177e4 LT |
711 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; |
712 | child->resource[i]->name = child->name; | |
713 | } | |
714 | bridge->subordinate = child; | |
715 | ||
4f535093 YL |
716 | add_dev: |
717 | ret = device_register(&child->dev); | |
718 | WARN_ON(ret < 0); | |
719 | ||
10a95747 JL |
720 | pcibios_add_bus(child); |
721 | ||
4f535093 YL |
722 | /* Create legacy_io and legacy_mem files for this bus */ |
723 | pci_create_legacy_files(child); | |
724 | ||
1da177e4 LT |
725 | return child; |
726 | } | |
727 | ||
3c78bc61 RD |
728 | struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, |
729 | int busnr) | |
1da177e4 LT |
730 | { |
731 | struct pci_bus *child; | |
732 | ||
733 | child = pci_alloc_child_bus(parent, dev, busnr); | |
e4ea9bb7 | 734 | if (child) { |
d71374da | 735 | down_write(&pci_bus_sem); |
1da177e4 | 736 | list_add_tail(&child->node, &parent->children); |
d71374da | 737 | up_write(&pci_bus_sem); |
e4ea9bb7 | 738 | } |
1da177e4 LT |
739 | return child; |
740 | } | |
b7fe9434 | 741 | EXPORT_SYMBOL(pci_add_new_bus); |
1da177e4 | 742 | |
1da177e4 LT |
743 | /* |
744 | * If it's a bridge, configure it and scan the bus behind it. | |
745 | * For CardBus bridges, we don't scan behind as the devices will | |
746 | * be handled by the bridge driver itself. | |
747 | * | |
748 | * We need to process bridges in two passes -- first we scan those | |
749 | * already configured by the BIOS and after we are done with all of | |
750 | * them, we proceed to assigning numbers to the remaining buses in | |
751 | * order to avoid overlaps between old and new bus numbers. | |
752 | */ | |
15856ad5 | 753 | int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) |
1da177e4 LT |
754 | { |
755 | struct pci_bus *child; | |
756 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); | |
49887941 | 757 | u32 buses, i, j = 0; |
1da177e4 | 758 | u16 bctl; |
99ddd552 | 759 | u8 primary, secondary, subordinate; |
a1c19894 | 760 | int broken = 0; |
1da177e4 LT |
761 | |
762 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); | |
99ddd552 BH |
763 | primary = buses & 0xFF; |
764 | secondary = (buses >> 8) & 0xFF; | |
765 | subordinate = (buses >> 16) & 0xFF; | |
1da177e4 | 766 | |
99ddd552 BH |
767 | dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", |
768 | secondary, subordinate, pass); | |
1da177e4 | 769 | |
71f6bd4a YL |
770 | if (!primary && (primary != bus->number) && secondary && subordinate) { |
771 | dev_warn(&dev->dev, "Primary bus is hard wired to 0\n"); | |
772 | primary = bus->number; | |
773 | } | |
774 | ||
a1c19894 BH |
775 | /* Check if setup is sensible at all */ |
776 | if (!pass && | |
1965f66e | 777 | (primary != bus->number || secondary <= bus->number || |
1820ffdc | 778 | secondary > subordinate || subordinate > bus->busn_res.end)) { |
1965f66e YL |
779 | dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n", |
780 | secondary, subordinate); | |
a1c19894 BH |
781 | broken = 1; |
782 | } | |
783 | ||
1da177e4 | 784 | /* Disable MasterAbortMode during probing to avoid reporting |
f7625980 | 785 | of bus errors (in some architectures) */ |
1da177e4 LT |
786 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); |
787 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, | |
788 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); | |
789 | ||
99ddd552 BH |
790 | if ((secondary || subordinate) && !pcibios_assign_all_busses() && |
791 | !is_cardbus && !broken) { | |
792 | unsigned int cmax; | |
1da177e4 LT |
793 | /* |
794 | * Bus already configured by firmware, process it in the first | |
795 | * pass and just note the configuration. | |
796 | */ | |
797 | if (pass) | |
bbe8f9a3 | 798 | goto out; |
1da177e4 LT |
799 | |
800 | /* | |
2ed85823 AN |
801 | * The bus might already exist for two reasons: Either we are |
802 | * rescanning the bus or the bus is reachable through more than | |
803 | * one bridge. The second case can happen with the i450NX | |
804 | * chipset. | |
1da177e4 | 805 | */ |
99ddd552 | 806 | child = pci_find_bus(pci_domain_nr(bus), secondary); |
74710ded | 807 | if (!child) { |
99ddd552 | 808 | child = pci_add_new_bus(bus, dev, secondary); |
74710ded AC |
809 | if (!child) |
810 | goto out; | |
99ddd552 | 811 | child->primary = primary; |
bc76b731 | 812 | pci_bus_insert_busn_res(child, secondary, subordinate); |
74710ded | 813 | child->bridge_ctl = bctl; |
1da177e4 LT |
814 | } |
815 | ||
1da177e4 | 816 | cmax = pci_scan_child_bus(child); |
c95b0bd6 AN |
817 | if (cmax > subordinate) |
818 | dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n", | |
819 | subordinate, cmax); | |
820 | /* subordinate should equal child->busn_res.end */ | |
821 | if (subordinate > max) | |
822 | max = subordinate; | |
1da177e4 LT |
823 | } else { |
824 | /* | |
825 | * We need to assign a number to this bus which we always | |
826 | * do in the second pass. | |
827 | */ | |
12f44f46 | 828 | if (!pass) { |
619c8c31 | 829 | if (pcibios_assign_all_busses() || broken || is_cardbus) |
12f44f46 IK |
830 | /* Temporarily disable forwarding of the |
831 | configuration cycles on all bridges in | |
832 | this bus segment to avoid possible | |
833 | conflicts in the second pass between two | |
834 | bridges programmed with overlapping | |
835 | bus ranges. */ | |
836 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, | |
837 | buses & ~0xffffff); | |
bbe8f9a3 | 838 | goto out; |
12f44f46 | 839 | } |
1da177e4 | 840 | |
fc1b2531 AN |
841 | if (max >= bus->busn_res.end) { |
842 | dev_warn(&dev->dev, "can't allocate child bus %02x from %pR\n", | |
843 | max, &bus->busn_res); | |
844 | goto out; | |
845 | } | |
846 | ||
1da177e4 LT |
847 | /* Clear errors */ |
848 | pci_write_config_word(dev, PCI_STATUS, 0xffff); | |
849 | ||
fc1b2531 | 850 | /* The bus will already exist if we are rescanning */ |
b1a98b69 TC |
851 | child = pci_find_bus(pci_domain_nr(bus), max+1); |
852 | if (!child) { | |
9a4d7d87 | 853 | child = pci_add_new_bus(bus, dev, max+1); |
b1a98b69 TC |
854 | if (!child) |
855 | goto out; | |
1820ffdc AN |
856 | pci_bus_insert_busn_res(child, max+1, |
857 | bus->busn_res.end); | |
b1a98b69 | 858 | } |
9a4d7d87 | 859 | max++; |
1da177e4 LT |
860 | buses = (buses & 0xff000000) |
861 | | ((unsigned int)(child->primary) << 0) | |
b918c62e YL |
862 | | ((unsigned int)(child->busn_res.start) << 8) |
863 | | ((unsigned int)(child->busn_res.end) << 16); | |
1da177e4 LT |
864 | |
865 | /* | |
866 | * yenta.c forces a secondary latency timer of 176. | |
867 | * Copy that behaviour here. | |
868 | */ | |
869 | if (is_cardbus) { | |
870 | buses &= ~0xff000000; | |
871 | buses |= CARDBUS_LATENCY_TIMER << 24; | |
872 | } | |
7c867c88 | 873 | |
1da177e4 LT |
874 | /* |
875 | * We need to blast all three values with a single write. | |
876 | */ | |
877 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); | |
878 | ||
879 | if (!is_cardbus) { | |
11949255 | 880 | child->bridge_ctl = bctl; |
1da177e4 LT |
881 | max = pci_scan_child_bus(child); |
882 | } else { | |
883 | /* | |
884 | * For CardBus bridges, we leave 4 bus numbers | |
885 | * as cards with a PCI-to-PCI bridge can be | |
886 | * inserted later. | |
887 | */ | |
3c78bc61 | 888 | for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) { |
49887941 | 889 | struct pci_bus *parent = bus; |
cc57450f RS |
890 | if (pci_find_bus(pci_domain_nr(bus), |
891 | max+i+1)) | |
892 | break; | |
49887941 DB |
893 | while (parent->parent) { |
894 | if ((!pcibios_assign_all_busses()) && | |
b918c62e YL |
895 | (parent->busn_res.end > max) && |
896 | (parent->busn_res.end <= max+i)) { | |
49887941 DB |
897 | j = 1; |
898 | } | |
899 | parent = parent->parent; | |
900 | } | |
901 | if (j) { | |
902 | /* | |
903 | * Often, there are two cardbus bridges | |
904 | * -- try to leave one valid bus number | |
905 | * for each one. | |
906 | */ | |
907 | i /= 2; | |
908 | break; | |
909 | } | |
910 | } | |
cc57450f | 911 | max += i; |
1da177e4 LT |
912 | } |
913 | /* | |
914 | * Set the subordinate bus number to its real value. | |
915 | */ | |
1820ffdc AN |
916 | if (max > bus->busn_res.end) { |
917 | dev_warn(&dev->dev, "max busn %02x is outside %pR\n", | |
918 | max, &bus->busn_res); | |
919 | max = bus->busn_res.end; | |
920 | } | |
bc76b731 | 921 | pci_bus_update_busn_res_end(child, max); |
1da177e4 LT |
922 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); |
923 | } | |
924 | ||
cb3576fa GH |
925 | sprintf(child->name, |
926 | (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), | |
927 | pci_domain_nr(bus), child->number); | |
1da177e4 | 928 | |
d55bef51 | 929 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
49887941 | 930 | while (bus->parent) { |
b918c62e YL |
931 | if ((child->busn_res.end > bus->busn_res.end) || |
932 | (child->number > bus->busn_res.end) || | |
49887941 | 933 | (child->number < bus->number) || |
b918c62e | 934 | (child->busn_res.end < bus->number)) { |
227f0647 | 935 | dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n", |
b918c62e YL |
936 | &child->busn_res, |
937 | (bus->number > child->busn_res.end && | |
938 | bus->busn_res.end < child->number) ? | |
a6f29a98 JP |
939 | "wholly" : "partially", |
940 | bus->self->transparent ? " transparent" : "", | |
865df576 | 941 | dev_name(&bus->dev), |
b918c62e | 942 | &bus->busn_res); |
49887941 DB |
943 | } |
944 | bus = bus->parent; | |
945 | } | |
946 | ||
bbe8f9a3 RB |
947 | out: |
948 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); | |
949 | ||
1da177e4 LT |
950 | return max; |
951 | } | |
b7fe9434 | 952 | EXPORT_SYMBOL(pci_scan_bridge); |
1da177e4 LT |
953 | |
954 | /* | |
955 | * Read interrupt line and base address registers. | |
956 | * The architecture-dependent code can tweak these, of course. | |
957 | */ | |
958 | static void pci_read_irq(struct pci_dev *dev) | |
959 | { | |
960 | unsigned char irq; | |
961 | ||
962 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); | |
ffeff788 | 963 | dev->pin = irq; |
1da177e4 LT |
964 | if (irq) |
965 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); | |
966 | dev->irq = irq; | |
967 | } | |
968 | ||
bb209c82 | 969 | void set_pcie_port_type(struct pci_dev *pdev) |
480b93b7 YZ |
970 | { |
971 | int pos; | |
972 | u16 reg16; | |
973 | ||
974 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
975 | if (!pos) | |
976 | return; | |
0efea000 | 977 | pdev->pcie_cap = pos; |
480b93b7 | 978 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
786e2288 | 979 | pdev->pcie_flags_reg = reg16; |
b03e7495 JM |
980 | pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); |
981 | pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; | |
480b93b7 YZ |
982 | } |
983 | ||
bb209c82 | 984 | void set_pcie_hotplug_bridge(struct pci_dev *pdev) |
28760489 | 985 | { |
28760489 EB |
986 | u32 reg32; |
987 | ||
59875ae4 | 988 | pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); |
28760489 EB |
989 | if (reg32 & PCI_EXP_SLTCAP_HPC) |
990 | pdev->is_hotplug_bridge = 1; | |
991 | } | |
992 | ||
78916b00 AW |
993 | /** |
994 | * pci_ext_cfg_is_aliased - is ext config space just an alias of std config? | |
995 | * @dev: PCI device | |
996 | * | |
997 | * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that | |
998 | * when forwarding a type1 configuration request the bridge must check that | |
999 | * the extended register address field is zero. The bridge is not permitted | |
1000 | * to forward the transactions and must handle it as an Unsupported Request. | |
1001 | * Some bridges do not follow this rule and simply drop the extended register | |
1002 | * bits, resulting in the standard config space being aliased, every 256 | |
1003 | * bytes across the entire configuration space. Test for this condition by | |
1004 | * comparing the first dword of each potential alias to the vendor/device ID. | |
1005 | * Known offenders: | |
1006 | * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03) | |
1007 | * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40) | |
1008 | */ | |
1009 | static bool pci_ext_cfg_is_aliased(struct pci_dev *dev) | |
1010 | { | |
1011 | #ifdef CONFIG_PCI_QUIRKS | |
1012 | int pos; | |
1013 | u32 header, tmp; | |
1014 | ||
1015 | pci_read_config_dword(dev, PCI_VENDOR_ID, &header); | |
1016 | ||
1017 | for (pos = PCI_CFG_SPACE_SIZE; | |
1018 | pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) { | |
1019 | if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL | |
1020 | || header != tmp) | |
1021 | return false; | |
1022 | } | |
1023 | ||
1024 | return true; | |
1025 | #else | |
1026 | return false; | |
1027 | #endif | |
1028 | } | |
1029 | ||
0b950f0f SH |
1030 | /** |
1031 | * pci_cfg_space_size - get the configuration space size of the PCI device. | |
1032 | * @dev: PCI device | |
1033 | * | |
1034 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices | |
1035 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can | |
1036 | * access it. Maybe we don't have a way to generate extended config space | |
1037 | * accesses, or the device is behind a reverse Express bridge. So we try | |
1038 | * reading the dword at 0x100 which must either be 0 or a valid extended | |
1039 | * capability header. | |
1040 | */ | |
1041 | static int pci_cfg_space_size_ext(struct pci_dev *dev) | |
1042 | { | |
1043 | u32 status; | |
1044 | int pos = PCI_CFG_SPACE_SIZE; | |
1045 | ||
1046 | if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) | |
1047 | goto fail; | |
78916b00 | 1048 | if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev)) |
0b950f0f SH |
1049 | goto fail; |
1050 | ||
1051 | return PCI_CFG_SPACE_EXP_SIZE; | |
1052 | ||
1053 | fail: | |
1054 | return PCI_CFG_SPACE_SIZE; | |
1055 | } | |
1056 | ||
1057 | int pci_cfg_space_size(struct pci_dev *dev) | |
1058 | { | |
1059 | int pos; | |
1060 | u32 status; | |
1061 | u16 class; | |
1062 | ||
1063 | class = dev->class >> 8; | |
1064 | if (class == PCI_CLASS_BRIDGE_HOST) | |
1065 | return pci_cfg_space_size_ext(dev); | |
1066 | ||
1067 | if (!pci_is_pcie(dev)) { | |
1068 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
1069 | if (!pos) | |
1070 | goto fail; | |
1071 | ||
1072 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); | |
1073 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) | |
1074 | goto fail; | |
1075 | } | |
1076 | ||
1077 | return pci_cfg_space_size_ext(dev); | |
1078 | ||
1079 | fail: | |
1080 | return PCI_CFG_SPACE_SIZE; | |
1081 | } | |
1082 | ||
01abc2aa | 1083 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
76e6a1d6 | 1084 | |
1da177e4 LT |
1085 | /** |
1086 | * pci_setup_device - fill in class and map information of a device | |
1087 | * @dev: the device structure to fill | |
1088 | * | |
f7625980 | 1089 | * Initialize the device structure with information about the device's |
1da177e4 LT |
1090 | * vendor,class,memory and IO-space addresses,IRQ lines etc. |
1091 | * Called at initialisation of the PCI subsystem and by CardBus services. | |
480b93b7 YZ |
1092 | * Returns 0 on success and negative if unknown type of device (not normal, |
1093 | * bridge or CardBus). | |
1da177e4 | 1094 | */ |
480b93b7 | 1095 | int pci_setup_device(struct pci_dev *dev) |
1da177e4 LT |
1096 | { |
1097 | u32 class; | |
480b93b7 YZ |
1098 | u8 hdr_type; |
1099 | struct pci_slot *slot; | |
bc577d2b | 1100 | int pos = 0; |
5bfa14ed BH |
1101 | struct pci_bus_region region; |
1102 | struct resource *res; | |
480b93b7 YZ |
1103 | |
1104 | if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) | |
1105 | return -EIO; | |
1106 | ||
1107 | dev->sysdata = dev->bus->sysdata; | |
1108 | dev->dev.parent = dev->bus->bridge; | |
1109 | dev->dev.bus = &pci_bus_type; | |
1110 | dev->hdr_type = hdr_type & 0x7f; | |
1111 | dev->multifunction = !!(hdr_type & 0x80); | |
480b93b7 YZ |
1112 | dev->error_state = pci_channel_io_normal; |
1113 | set_pcie_port_type(dev); | |
1114 | ||
1115 | list_for_each_entry(slot, &dev->bus->slots, list) | |
1116 | if (PCI_SLOT(dev->devfn) == slot->number) | |
1117 | dev->slot = slot; | |
1118 | ||
1119 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) | |
1120 | set this higher, assuming the system even supports it. */ | |
1121 | dev->dma_mask = 0xffffffff; | |
1da177e4 | 1122 | |
eebfcfb5 GKH |
1123 | dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), |
1124 | dev->bus->number, PCI_SLOT(dev->devfn), | |
1125 | PCI_FUNC(dev->devfn)); | |
1da177e4 LT |
1126 | |
1127 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); | |
b8a3a521 | 1128 | dev->revision = class & 0xff; |
2dd8ba92 | 1129 | dev->class = class >> 8; /* upper 3 bytes */ |
1da177e4 | 1130 | |
2dd8ba92 YL |
1131 | dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n", |
1132 | dev->vendor, dev->device, dev->hdr_type, dev->class); | |
1da177e4 | 1133 | |
853346e4 YZ |
1134 | /* need to have dev->class ready */ |
1135 | dev->cfg_size = pci_cfg_space_size(dev); | |
1136 | ||
1da177e4 | 1137 | /* "Unknown power state" */ |
3fe9d19f | 1138 | dev->current_state = PCI_UNKNOWN; |
1da177e4 LT |
1139 | |
1140 | /* Early fixups, before probing the BARs */ | |
1141 | pci_fixup_device(pci_fixup_early, dev); | |
f79b1b14 YZ |
1142 | /* device class may be changed after fixup */ |
1143 | class = dev->class >> 8; | |
1da177e4 LT |
1144 | |
1145 | switch (dev->hdr_type) { /* header type */ | |
1146 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ | |
1147 | if (class == PCI_CLASS_BRIDGE_PCI) | |
1148 | goto bad; | |
1149 | pci_read_irq(dev); | |
1150 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); | |
1151 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1152 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); | |
368c73d4 AC |
1153 | |
1154 | /* | |
075eb9e3 BH |
1155 | * Do the ugly legacy mode stuff here rather than broken chip |
1156 | * quirk code. Legacy mode ATA controllers have fixed | |
1157 | * addresses. These are not always echoed in BAR0-3, and | |
1158 | * BAR0-3 in a few cases contain junk! | |
368c73d4 AC |
1159 | */ |
1160 | if (class == PCI_CLASS_STORAGE_IDE) { | |
1161 | u8 progif; | |
1162 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); | |
1163 | if ((progif & 1) == 0) { | |
5bfa14ed BH |
1164 | region.start = 0x1F0; |
1165 | region.end = 0x1F7; | |
1166 | res = &dev->resource[0]; | |
1167 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1168 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1169 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n", |
1170 | res); | |
5bfa14ed BH |
1171 | region.start = 0x3F6; |
1172 | region.end = 0x3F6; | |
1173 | res = &dev->resource[1]; | |
1174 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1175 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1176 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n", |
1177 | res); | |
368c73d4 AC |
1178 | } |
1179 | if ((progif & 4) == 0) { | |
5bfa14ed BH |
1180 | region.start = 0x170; |
1181 | region.end = 0x177; | |
1182 | res = &dev->resource[2]; | |
1183 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1184 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1185 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n", |
1186 | res); | |
5bfa14ed BH |
1187 | region.start = 0x376; |
1188 | region.end = 0x376; | |
1189 | res = &dev->resource[3]; | |
1190 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1191 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1192 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n", |
1193 | res); | |
368c73d4 AC |
1194 | } |
1195 | } | |
1da177e4 LT |
1196 | break; |
1197 | ||
1198 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ | |
1199 | if (class != PCI_CLASS_BRIDGE_PCI) | |
1200 | goto bad; | |
1201 | /* The PCI-to-PCI bridge spec requires that subtractive | |
1202 | decoding (i.e. transparent) bridge must have programming | |
f7625980 | 1203 | interface code of 0x01. */ |
3efd273b | 1204 | pci_read_irq(dev); |
1da177e4 LT |
1205 | dev->transparent = ((dev->class & 0xff) == 1); |
1206 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); | |
28760489 | 1207 | set_pcie_hotplug_bridge(dev); |
bc577d2b GB |
1208 | pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); |
1209 | if (pos) { | |
1210 | pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); | |
1211 | pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); | |
1212 | } | |
1da177e4 LT |
1213 | break; |
1214 | ||
1215 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ | |
1216 | if (class != PCI_CLASS_BRIDGE_CARDBUS) | |
1217 | goto bad; | |
1218 | pci_read_irq(dev); | |
1219 | pci_read_bases(dev, 1, 0); | |
1220 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1221 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); | |
1222 | break; | |
1223 | ||
1224 | default: /* unknown header */ | |
227f0647 RD |
1225 | dev_err(&dev->dev, "unknown header type %02x, ignoring device\n", |
1226 | dev->hdr_type); | |
480b93b7 | 1227 | return -EIO; |
1da177e4 LT |
1228 | |
1229 | bad: | |
227f0647 RD |
1230 | dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n", |
1231 | dev->class, dev->hdr_type); | |
1da177e4 LT |
1232 | dev->class = PCI_CLASS_NOT_DEFINED; |
1233 | } | |
1234 | ||
1235 | /* We found a fine healthy device, go go go... */ | |
1236 | return 0; | |
1237 | } | |
1238 | ||
201de56e ZY |
1239 | static void pci_release_capabilities(struct pci_dev *dev) |
1240 | { | |
1241 | pci_vpd_release(dev); | |
d1b054da | 1242 | pci_iov_release(dev); |
f796841e | 1243 | pci_free_cap_save_buffers(dev); |
201de56e ZY |
1244 | } |
1245 | ||
1da177e4 LT |
1246 | /** |
1247 | * pci_release_dev - free a pci device structure when all users of it are finished. | |
1248 | * @dev: device that's been disconnected | |
1249 | * | |
1250 | * Will be called only by the device core when all users of this pci device are | |
1251 | * done. | |
1252 | */ | |
1253 | static void pci_release_dev(struct device *dev) | |
1254 | { | |
04480094 | 1255 | struct pci_dev *pci_dev; |
1da177e4 | 1256 | |
04480094 | 1257 | pci_dev = to_pci_dev(dev); |
201de56e | 1258 | pci_release_capabilities(pci_dev); |
98d9f30c | 1259 | pci_release_of_node(pci_dev); |
6ae32c53 | 1260 | pcibios_release_device(pci_dev); |
8b1fce04 | 1261 | pci_bus_put(pci_dev->bus); |
782a985d | 1262 | kfree(pci_dev->driver_override); |
1da177e4 LT |
1263 | kfree(pci_dev); |
1264 | } | |
1265 | ||
3c6e6ae7 | 1266 | struct pci_dev *pci_alloc_dev(struct pci_bus *bus) |
65891215 ME |
1267 | { |
1268 | struct pci_dev *dev; | |
1269 | ||
1270 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); | |
1271 | if (!dev) | |
1272 | return NULL; | |
1273 | ||
65891215 | 1274 | INIT_LIST_HEAD(&dev->bus_list); |
88e7b167 | 1275 | dev->dev.type = &pci_dev_type; |
3c6e6ae7 | 1276 | dev->bus = pci_bus_get(bus); |
65891215 ME |
1277 | |
1278 | return dev; | |
1279 | } | |
3c6e6ae7 GZ |
1280 | EXPORT_SYMBOL(pci_alloc_dev); |
1281 | ||
efdc87da | 1282 | bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, |
3c78bc61 | 1283 | int crs_timeout) |
1da177e4 | 1284 | { |
1da177e4 LT |
1285 | int delay = 1; |
1286 | ||
efdc87da YL |
1287 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
1288 | return false; | |
1da177e4 LT |
1289 | |
1290 | /* some broken boards return 0 or ~0 if a slot is empty: */ | |
efdc87da YL |
1291 | if (*l == 0xffffffff || *l == 0x00000000 || |
1292 | *l == 0x0000ffff || *l == 0xffff0000) | |
1293 | return false; | |
1da177e4 LT |
1294 | |
1295 | /* Configuration request Retry Status */ | |
efdc87da YL |
1296 | while (*l == 0xffff0001) { |
1297 | if (!crs_timeout) | |
1298 | return false; | |
1299 | ||
1da177e4 LT |
1300 | msleep(delay); |
1301 | delay *= 2; | |
efdc87da YL |
1302 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
1303 | return false; | |
1da177e4 | 1304 | /* Card hasn't responded in 60 seconds? Must be stuck. */ |
efdc87da | 1305 | if (delay > crs_timeout) { |
227f0647 RD |
1306 | printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n", |
1307 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), | |
1308 | PCI_FUNC(devfn)); | |
efdc87da | 1309 | return false; |
1da177e4 LT |
1310 | } |
1311 | } | |
1312 | ||
efdc87da YL |
1313 | return true; |
1314 | } | |
1315 | EXPORT_SYMBOL(pci_bus_read_dev_vendor_id); | |
1316 | ||
1317 | /* | |
1318 | * Read the config data for a PCI device, sanity-check it | |
1319 | * and fill in the dev structure... | |
1320 | */ | |
1321 | static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) | |
1322 | { | |
1323 | struct pci_dev *dev; | |
1324 | u32 l; | |
1325 | ||
1326 | if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000)) | |
1327 | return NULL; | |
1328 | ||
8b1fce04 | 1329 | dev = pci_alloc_dev(bus); |
1da177e4 LT |
1330 | if (!dev) |
1331 | return NULL; | |
1332 | ||
1da177e4 | 1333 | dev->devfn = devfn; |
1da177e4 LT |
1334 | dev->vendor = l & 0xffff; |
1335 | dev->device = (l >> 16) & 0xffff; | |
cef354db | 1336 | |
98d9f30c BH |
1337 | pci_set_of_node(dev); |
1338 | ||
480b93b7 | 1339 | if (pci_setup_device(dev)) { |
8b1fce04 | 1340 | pci_bus_put(dev->bus); |
1da177e4 LT |
1341 | kfree(dev); |
1342 | return NULL; | |
1343 | } | |
1da177e4 LT |
1344 | |
1345 | return dev; | |
1346 | } | |
1347 | ||
201de56e ZY |
1348 | static void pci_init_capabilities(struct pci_dev *dev) |
1349 | { | |
1350 | /* MSI/MSI-X list */ | |
1351 | pci_msi_init_pci_dev(dev); | |
1352 | ||
63f4898a RW |
1353 | /* Buffers for saving PCIe and PCI-X capabilities */ |
1354 | pci_allocate_cap_save_buffers(dev); | |
1355 | ||
201de56e ZY |
1356 | /* Power Management */ |
1357 | pci_pm_init(dev); | |
1358 | ||
1359 | /* Vital Product Data */ | |
1360 | pci_vpd_pci22_init(dev); | |
58c3a727 YZ |
1361 | |
1362 | /* Alternative Routing-ID Forwarding */ | |
31ab2476 | 1363 | pci_configure_ari(dev); |
d1b054da YZ |
1364 | |
1365 | /* Single Root I/O Virtualization */ | |
1366 | pci_iov_init(dev); | |
ae21ee65 AK |
1367 | |
1368 | /* Enable ACS P2P upstream forwarding */ | |
5d990b62 | 1369 | pci_enable_acs(dev); |
201de56e ZY |
1370 | } |
1371 | ||
96bde06a | 1372 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
1da177e4 | 1373 | { |
4f535093 YL |
1374 | int ret; |
1375 | ||
cdb9b9f7 PM |
1376 | device_initialize(&dev->dev); |
1377 | dev->dev.release = pci_release_dev; | |
1da177e4 | 1378 | |
7629d19a | 1379 | set_dev_node(&dev->dev, pcibus_to_node(bus)); |
cdb9b9f7 | 1380 | dev->dev.dma_mask = &dev->dma_mask; |
4d57cdfa | 1381 | dev->dev.dma_parms = &dev->dma_parms; |
cdb9b9f7 | 1382 | dev->dev.coherent_dma_mask = 0xffffffffull; |
1da177e4 | 1383 | |
4d57cdfa | 1384 | pci_set_dma_max_seg_size(dev, 65536); |
59fc67de | 1385 | pci_set_dma_seg_boundary(dev, 0xffffffff); |
4d57cdfa | 1386 | |
1da177e4 LT |
1387 | /* Fix up broken headers */ |
1388 | pci_fixup_device(pci_fixup_header, dev); | |
1389 | ||
2069ecfb YL |
1390 | /* moved out from quirk header fixup code */ |
1391 | pci_reassigndev_resource_alignment(dev); | |
1392 | ||
4b77b0a2 RW |
1393 | /* Clear the state_saved flag. */ |
1394 | dev->state_saved = false; | |
1395 | ||
201de56e ZY |
1396 | /* Initialize various capabilities */ |
1397 | pci_init_capabilities(dev); | |
eb9d0fe4 | 1398 | |
1da177e4 LT |
1399 | /* |
1400 | * Add the device to our list of discovered devices | |
1401 | * and the bus list for fixup functions, etc. | |
1402 | */ | |
d71374da | 1403 | down_write(&pci_bus_sem); |
1da177e4 | 1404 | list_add_tail(&dev->bus_list, &bus->devices); |
d71374da | 1405 | up_write(&pci_bus_sem); |
4f535093 | 1406 | |
4f535093 YL |
1407 | ret = pcibios_add_device(dev); |
1408 | WARN_ON(ret < 0); | |
1409 | ||
1410 | /* Notifier could use PCI capabilities */ | |
1411 | dev->match_driver = false; | |
1412 | ret = device_add(&dev->dev); | |
1413 | WARN_ON(ret < 0); | |
cdb9b9f7 PM |
1414 | } |
1415 | ||
10874f5a | 1416 | struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn) |
cdb9b9f7 PM |
1417 | { |
1418 | struct pci_dev *dev; | |
1419 | ||
90bdb311 TP |
1420 | dev = pci_get_slot(bus, devfn); |
1421 | if (dev) { | |
1422 | pci_dev_put(dev); | |
1423 | return dev; | |
1424 | } | |
1425 | ||
cdb9b9f7 PM |
1426 | dev = pci_scan_device(bus, devfn); |
1427 | if (!dev) | |
1428 | return NULL; | |
1429 | ||
1430 | pci_device_add(dev, bus); | |
1da177e4 LT |
1431 | |
1432 | return dev; | |
1433 | } | |
b73e9687 | 1434 | EXPORT_SYMBOL(pci_scan_single_device); |
1da177e4 | 1435 | |
b1bd58e4 | 1436 | static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn) |
f07852d6 | 1437 | { |
b1bd58e4 YW |
1438 | int pos; |
1439 | u16 cap = 0; | |
1440 | unsigned next_fn; | |
4fb88c1a | 1441 | |
b1bd58e4 YW |
1442 | if (pci_ari_enabled(bus)) { |
1443 | if (!dev) | |
1444 | return 0; | |
1445 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); | |
1446 | if (!pos) | |
1447 | return 0; | |
4fb88c1a | 1448 | |
b1bd58e4 YW |
1449 | pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap); |
1450 | next_fn = PCI_ARI_CAP_NFN(cap); | |
1451 | if (next_fn <= fn) | |
1452 | return 0; /* protect against malformed list */ | |
f07852d6 | 1453 | |
b1bd58e4 YW |
1454 | return next_fn; |
1455 | } | |
1456 | ||
1457 | /* dev may be NULL for non-contiguous multifunction devices */ | |
1458 | if (!dev || dev->multifunction) | |
1459 | return (fn + 1) % 8; | |
f07852d6 | 1460 | |
f07852d6 MW |
1461 | return 0; |
1462 | } | |
1463 | ||
1464 | static int only_one_child(struct pci_bus *bus) | |
1465 | { | |
1466 | struct pci_dev *parent = bus->self; | |
284f5f9d | 1467 | |
f07852d6 MW |
1468 | if (!parent || !pci_is_pcie(parent)) |
1469 | return 0; | |
62f87c0e | 1470 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT) |
284f5f9d | 1471 | return 1; |
62f87c0e | 1472 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM && |
284f5f9d | 1473 | !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS)) |
f07852d6 MW |
1474 | return 1; |
1475 | return 0; | |
1476 | } | |
1477 | ||
1da177e4 LT |
1478 | /** |
1479 | * pci_scan_slot - scan a PCI slot on a bus for devices. | |
1480 | * @bus: PCI bus to scan | |
1481 | * @devfn: slot number to scan (must have zero function.) | |
1482 | * | |
1483 | * Scan a PCI slot on the specified PCI bus for devices, adding | |
1484 | * discovered devices to the @bus->devices list. New devices | |
8a1bc901 | 1485 | * will not have is_added set. |
1b69dfc6 TP |
1486 | * |
1487 | * Returns the number of new devices found. | |
1da177e4 | 1488 | */ |
96bde06a | 1489 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
1da177e4 | 1490 | { |
f07852d6 | 1491 | unsigned fn, nr = 0; |
1b69dfc6 | 1492 | struct pci_dev *dev; |
f07852d6 MW |
1493 | |
1494 | if (only_one_child(bus) && (devfn > 0)) | |
1495 | return 0; /* Already scanned the entire slot */ | |
1da177e4 | 1496 | |
1b69dfc6 | 1497 | dev = pci_scan_single_device(bus, devfn); |
4fb88c1a MW |
1498 | if (!dev) |
1499 | return 0; | |
1500 | if (!dev->is_added) | |
1b69dfc6 TP |
1501 | nr++; |
1502 | ||
b1bd58e4 | 1503 | for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) { |
f07852d6 MW |
1504 | dev = pci_scan_single_device(bus, devfn + fn); |
1505 | if (dev) { | |
1506 | if (!dev->is_added) | |
1507 | nr++; | |
1508 | dev->multifunction = 1; | |
1da177e4 LT |
1509 | } |
1510 | } | |
7d715a6c | 1511 | |
149e1637 SL |
1512 | /* only one slot has pcie device */ |
1513 | if (bus->self && nr) | |
7d715a6c SL |
1514 | pcie_aspm_init_link_state(bus->self); |
1515 | ||
1da177e4 LT |
1516 | return nr; |
1517 | } | |
b7fe9434 | 1518 | EXPORT_SYMBOL(pci_scan_slot); |
1da177e4 | 1519 | |
b03e7495 JM |
1520 | static int pcie_find_smpss(struct pci_dev *dev, void *data) |
1521 | { | |
1522 | u8 *smpss = data; | |
1523 | ||
1524 | if (!pci_is_pcie(dev)) | |
1525 | return 0; | |
1526 | ||
d4aa68f6 YW |
1527 | /* |
1528 | * We don't have a way to change MPS settings on devices that have | |
1529 | * drivers attached. A hot-added device might support only the minimum | |
1530 | * MPS setting (MPS=128). Therefore, if the fabric contains a bridge | |
1531 | * where devices may be hot-added, we limit the fabric MPS to 128 so | |
1532 | * hot-added devices will work correctly. | |
1533 | * | |
1534 | * However, if we hot-add a device to a slot directly below a Root | |
1535 | * Port, it's impossible for there to be other existing devices below | |
1536 | * the port. We don't limit the MPS in this case because we can | |
1537 | * reconfigure MPS on both the Root Port and the hot-added device, | |
1538 | * and there are no other devices involved. | |
1539 | * | |
1540 | * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA. | |
b03e7495 | 1541 | */ |
d4aa68f6 YW |
1542 | if (dev->is_hotplug_bridge && |
1543 | pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) | |
b03e7495 JM |
1544 | *smpss = 0; |
1545 | ||
1546 | if (*smpss > dev->pcie_mpss) | |
1547 | *smpss = dev->pcie_mpss; | |
1548 | ||
1549 | return 0; | |
1550 | } | |
1551 | ||
1552 | static void pcie_write_mps(struct pci_dev *dev, int mps) | |
1553 | { | |
62f392ea | 1554 | int rc; |
b03e7495 JM |
1555 | |
1556 | if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { | |
62f392ea | 1557 | mps = 128 << dev->pcie_mpss; |
b03e7495 | 1558 | |
62f87c0e YW |
1559 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT && |
1560 | dev->bus->self) | |
62f392ea | 1561 | /* For "Performance", the assumption is made that |
b03e7495 JM |
1562 | * downstream communication will never be larger than |
1563 | * the MRRS. So, the MPS only needs to be configured | |
1564 | * for the upstream communication. This being the case, | |
1565 | * walk from the top down and set the MPS of the child | |
1566 | * to that of the parent bus. | |
62f392ea JM |
1567 | * |
1568 | * Configure the device MPS with the smaller of the | |
1569 | * device MPSS or the bridge MPS (which is assumed to be | |
1570 | * properly configured at this point to the largest | |
1571 | * allowable MPS based on its parent bus). | |
b03e7495 | 1572 | */ |
62f392ea | 1573 | mps = min(mps, pcie_get_mps(dev->bus->self)); |
b03e7495 JM |
1574 | } |
1575 | ||
1576 | rc = pcie_set_mps(dev, mps); | |
1577 | if (rc) | |
1578 | dev_err(&dev->dev, "Failed attempting to set the MPS\n"); | |
1579 | } | |
1580 | ||
62f392ea | 1581 | static void pcie_write_mrrs(struct pci_dev *dev) |
b03e7495 | 1582 | { |
62f392ea | 1583 | int rc, mrrs; |
b03e7495 | 1584 | |
ed2888e9 JM |
1585 | /* In the "safe" case, do not configure the MRRS. There appear to be |
1586 | * issues with setting MRRS to 0 on a number of devices. | |
1587 | */ | |
ed2888e9 JM |
1588 | if (pcie_bus_config != PCIE_BUS_PERFORMANCE) |
1589 | return; | |
1590 | ||
ed2888e9 JM |
1591 | /* For Max performance, the MRRS must be set to the largest supported |
1592 | * value. However, it cannot be configured larger than the MPS the | |
62f392ea JM |
1593 | * device or the bus can support. This should already be properly |
1594 | * configured by a prior call to pcie_write_mps. | |
ed2888e9 | 1595 | */ |
62f392ea | 1596 | mrrs = pcie_get_mps(dev); |
b03e7495 JM |
1597 | |
1598 | /* MRRS is a R/W register. Invalid values can be written, but a | |
ed2888e9 | 1599 | * subsequent read will verify if the value is acceptable or not. |
b03e7495 JM |
1600 | * If the MRRS value provided is not acceptable (e.g., too large), |
1601 | * shrink the value until it is acceptable to the HW. | |
f7625980 | 1602 | */ |
b03e7495 JM |
1603 | while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) { |
1604 | rc = pcie_set_readrq(dev, mrrs); | |
62f392ea JM |
1605 | if (!rc) |
1606 | break; | |
b03e7495 | 1607 | |
62f392ea | 1608 | dev_warn(&dev->dev, "Failed attempting to set the MRRS\n"); |
b03e7495 JM |
1609 | mrrs /= 2; |
1610 | } | |
62f392ea JM |
1611 | |
1612 | if (mrrs < 128) | |
227f0647 | 1613 | dev_err(&dev->dev, "MRRS was unable to be configured with a safe value. If problems are experienced, try running with pci=pcie_bus_safe\n"); |
b03e7495 JM |
1614 | } |
1615 | ||
5895af79 YW |
1616 | static void pcie_bus_detect_mps(struct pci_dev *dev) |
1617 | { | |
1618 | struct pci_dev *bridge = dev->bus->self; | |
1619 | int mps, p_mps; | |
1620 | ||
1621 | if (!bridge) | |
1622 | return; | |
1623 | ||
1624 | mps = pcie_get_mps(dev); | |
1625 | p_mps = pcie_get_mps(bridge); | |
1626 | ||
1627 | if (mps != p_mps) | |
1628 | dev_warn(&dev->dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n", | |
1629 | mps, pci_name(bridge), p_mps); | |
1630 | } | |
1631 | ||
b03e7495 JM |
1632 | static int pcie_bus_configure_set(struct pci_dev *dev, void *data) |
1633 | { | |
a513a99a | 1634 | int mps, orig_mps; |
b03e7495 JM |
1635 | |
1636 | if (!pci_is_pcie(dev)) | |
1637 | return 0; | |
1638 | ||
5895af79 YW |
1639 | if (pcie_bus_config == PCIE_BUS_TUNE_OFF) { |
1640 | pcie_bus_detect_mps(dev); | |
1641 | return 0; | |
1642 | } | |
1643 | ||
a513a99a JM |
1644 | mps = 128 << *(u8 *)data; |
1645 | orig_mps = pcie_get_mps(dev); | |
b03e7495 JM |
1646 | |
1647 | pcie_write_mps(dev, mps); | |
62f392ea | 1648 | pcie_write_mrrs(dev); |
b03e7495 | 1649 | |
227f0647 RD |
1650 | dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n", |
1651 | pcie_get_mps(dev), 128 << dev->pcie_mpss, | |
a513a99a | 1652 | orig_mps, pcie_get_readrq(dev)); |
b03e7495 JM |
1653 | |
1654 | return 0; | |
1655 | } | |
1656 | ||
a513a99a | 1657 | /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down, |
b03e7495 JM |
1658 | * parents then children fashion. If this changes, then this code will not |
1659 | * work as designed. | |
1660 | */ | |
a58674ff | 1661 | void pcie_bus_configure_settings(struct pci_bus *bus) |
b03e7495 | 1662 | { |
1e358f94 | 1663 | u8 smpss = 0; |
b03e7495 | 1664 | |
a58674ff | 1665 | if (!bus->self) |
b03e7495 JM |
1666 | return; |
1667 | ||
b03e7495 | 1668 | if (!pci_is_pcie(bus->self)) |
5f39e670 JM |
1669 | return; |
1670 | ||
1671 | /* FIXME - Peer to peer DMA is possible, though the endpoint would need | |
3315472c | 1672 | * to be aware of the MPS of the destination. To work around this, |
5f39e670 JM |
1673 | * simply force the MPS of the entire system to the smallest possible. |
1674 | */ | |
1675 | if (pcie_bus_config == PCIE_BUS_PEER2PEER) | |
1676 | smpss = 0; | |
1677 | ||
b03e7495 | 1678 | if (pcie_bus_config == PCIE_BUS_SAFE) { |
a58674ff | 1679 | smpss = bus->self->pcie_mpss; |
5f39e670 | 1680 | |
b03e7495 JM |
1681 | pcie_find_smpss(bus->self, &smpss); |
1682 | pci_walk_bus(bus, pcie_find_smpss, &smpss); | |
1683 | } | |
1684 | ||
1685 | pcie_bus_configure_set(bus->self, &smpss); | |
1686 | pci_walk_bus(bus, pcie_bus_configure_set, &smpss); | |
1687 | } | |
debc3b77 | 1688 | EXPORT_SYMBOL_GPL(pcie_bus_configure_settings); |
b03e7495 | 1689 | |
15856ad5 | 1690 | unsigned int pci_scan_child_bus(struct pci_bus *bus) |
1da177e4 | 1691 | { |
b918c62e | 1692 | unsigned int devfn, pass, max = bus->busn_res.start; |
1da177e4 LT |
1693 | struct pci_dev *dev; |
1694 | ||
0207c356 | 1695 | dev_dbg(&bus->dev, "scanning bus\n"); |
1da177e4 LT |
1696 | |
1697 | /* Go find them, Rover! */ | |
1698 | for (devfn = 0; devfn < 0x100; devfn += 8) | |
1699 | pci_scan_slot(bus, devfn); | |
1700 | ||
a28724b0 YZ |
1701 | /* Reserve buses for SR-IOV capability. */ |
1702 | max += pci_iov_bus_range(bus); | |
1703 | ||
1da177e4 LT |
1704 | /* |
1705 | * After performing arch-dependent fixup of the bus, look behind | |
1706 | * all PCI-to-PCI bridges on this bus. | |
1707 | */ | |
74710ded | 1708 | if (!bus->is_added) { |
0207c356 | 1709 | dev_dbg(&bus->dev, "fixups for bus\n"); |
74710ded | 1710 | pcibios_fixup_bus(bus); |
981cf9ea | 1711 | bus->is_added = 1; |
74710ded AC |
1712 | } |
1713 | ||
3c78bc61 | 1714 | for (pass = 0; pass < 2; pass++) |
1da177e4 | 1715 | list_for_each_entry(dev, &bus->devices, bus_list) { |
6788a51f | 1716 | if (pci_is_bridge(dev)) |
1da177e4 LT |
1717 | max = pci_scan_bridge(bus, dev, max, pass); |
1718 | } | |
1719 | ||
1720 | /* | |
1721 | * We've scanned the bus and so we know all about what's on | |
1722 | * the other side of any bridges that may be on this bus plus | |
1723 | * any devices. | |
1724 | * | |
1725 | * Return how far we've got finding sub-buses. | |
1726 | */ | |
0207c356 | 1727 | dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); |
1da177e4 LT |
1728 | return max; |
1729 | } | |
b7fe9434 | 1730 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
1da177e4 | 1731 | |
6c0cc950 RW |
1732 | /** |
1733 | * pcibios_root_bridge_prepare - Platform-specific host bridge setup. | |
1734 | * @bridge: Host bridge to set up. | |
1735 | * | |
1736 | * Default empty implementation. Replace with an architecture-specific setup | |
1737 | * routine, if necessary. | |
1738 | */ | |
1739 | int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) | |
1740 | { | |
1741 | return 0; | |
1742 | } | |
1743 | ||
10a95747 JL |
1744 | void __weak pcibios_add_bus(struct pci_bus *bus) |
1745 | { | |
1746 | } | |
1747 | ||
1748 | void __weak pcibios_remove_bus(struct pci_bus *bus) | |
1749 | { | |
1750 | } | |
1751 | ||
166c6370 BH |
1752 | struct pci_bus *pci_create_root_bus(struct device *parent, int bus, |
1753 | struct pci_ops *ops, void *sysdata, struct list_head *resources) | |
1da177e4 | 1754 | { |
0efd5aab | 1755 | int error; |
5a21d70d | 1756 | struct pci_host_bridge *bridge; |
0207c356 | 1757 | struct pci_bus *b, *b2; |
0efd5aab | 1758 | struct pci_host_bridge_window *window, *n; |
a9d9f527 | 1759 | struct resource *res; |
0efd5aab BH |
1760 | resource_size_t offset; |
1761 | char bus_addr[64]; | |
1762 | char *fmt; | |
1da177e4 LT |
1763 | |
1764 | b = pci_alloc_bus(); | |
1765 | if (!b) | |
7b543663 | 1766 | return NULL; |
1da177e4 LT |
1767 | |
1768 | b->sysdata = sysdata; | |
1769 | b->ops = ops; | |
4f535093 | 1770 | b->number = b->busn_res.start = bus; |
0207c356 BH |
1771 | b2 = pci_find_bus(pci_domain_nr(b), bus); |
1772 | if (b2) { | |
1da177e4 | 1773 | /* If we already got to this bus through a different bridge, ignore it */ |
0207c356 | 1774 | dev_dbg(&b2->dev, "bus already known\n"); |
1da177e4 LT |
1775 | goto err_out; |
1776 | } | |
d71374da | 1777 | |
7b543663 YL |
1778 | bridge = pci_alloc_host_bridge(b); |
1779 | if (!bridge) | |
1780 | goto err_out; | |
1781 | ||
1782 | bridge->dev.parent = parent; | |
70efde2a | 1783 | bridge->dev.release = pci_release_host_bridge_dev; |
7b543663 | 1784 | dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); |
6c0cc950 | 1785 | error = pcibios_root_bridge_prepare(bridge); |
343df771 JL |
1786 | if (error) { |
1787 | kfree(bridge); | |
1788 | goto err_out; | |
1789 | } | |
6c0cc950 | 1790 | |
7b543663 | 1791 | error = device_register(&bridge->dev); |
343df771 JL |
1792 | if (error) { |
1793 | put_device(&bridge->dev); | |
1794 | goto err_out; | |
1795 | } | |
7b543663 | 1796 | b->bridge = get_device(&bridge->dev); |
a1e4d72c | 1797 | device_enable_async_suspend(b->bridge); |
98d9f30c | 1798 | pci_set_bus_of_node(b); |
1da177e4 | 1799 | |
0d358f22 YL |
1800 | if (!parent) |
1801 | set_dev_node(b->bridge, pcibus_to_node(b)); | |
1802 | ||
fd7d1ced GKH |
1803 | b->dev.class = &pcibus_class; |
1804 | b->dev.parent = b->bridge; | |
1a927133 | 1805 | dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); |
fd7d1ced | 1806 | error = device_register(&b->dev); |
1da177e4 LT |
1807 | if (error) |
1808 | goto class_dev_reg_err; | |
1da177e4 | 1809 | |
10a95747 JL |
1810 | pcibios_add_bus(b); |
1811 | ||
1da177e4 LT |
1812 | /* Create legacy_io and legacy_mem files for this bus */ |
1813 | pci_create_legacy_files(b); | |
1814 | ||
a9d9f527 BH |
1815 | if (parent) |
1816 | dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); | |
1817 | else | |
1818 | printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); | |
1819 | ||
0efd5aab BH |
1820 | /* Add initial resources to the bus */ |
1821 | list_for_each_entry_safe(window, n, resources, list) { | |
1822 | list_move_tail(&window->list, &bridge->windows); | |
1823 | res = window->res; | |
1824 | offset = window->offset; | |
f848ffb1 YL |
1825 | if (res->flags & IORESOURCE_BUS) |
1826 | pci_bus_insert_busn_res(b, bus, res->end); | |
1827 | else | |
1828 | pci_bus_add_resource(b, res, 0); | |
0efd5aab BH |
1829 | if (offset) { |
1830 | if (resource_type(res) == IORESOURCE_IO) | |
1831 | fmt = " (bus address [%#06llx-%#06llx])"; | |
1832 | else | |
1833 | fmt = " (bus address [%#010llx-%#010llx])"; | |
1834 | snprintf(bus_addr, sizeof(bus_addr), fmt, | |
1835 | (unsigned long long) (res->start - offset), | |
1836 | (unsigned long long) (res->end - offset)); | |
1837 | } else | |
1838 | bus_addr[0] = '\0'; | |
1839 | dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr); | |
a9d9f527 BH |
1840 | } |
1841 | ||
a5390aa6 BH |
1842 | down_write(&pci_bus_sem); |
1843 | list_add_tail(&b->node, &pci_root_buses); | |
1844 | up_write(&pci_bus_sem); | |
1845 | ||
1da177e4 LT |
1846 | return b; |
1847 | ||
1da177e4 | 1848 | class_dev_reg_err: |
7b543663 YL |
1849 | put_device(&bridge->dev); |
1850 | device_unregister(&bridge->dev); | |
1da177e4 | 1851 | err_out: |
1da177e4 LT |
1852 | kfree(b); |
1853 | return NULL; | |
1854 | } | |
cdb9b9f7 | 1855 | |
98a35831 YL |
1856 | int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) |
1857 | { | |
1858 | struct resource *res = &b->busn_res; | |
1859 | struct resource *parent_res, *conflict; | |
1860 | ||
1861 | res->start = bus; | |
1862 | res->end = bus_max; | |
1863 | res->flags = IORESOURCE_BUS; | |
1864 | ||
1865 | if (!pci_is_root_bus(b)) | |
1866 | parent_res = &b->parent->busn_res; | |
1867 | else { | |
1868 | parent_res = get_pci_domain_busn_res(pci_domain_nr(b)); | |
1869 | res->flags |= IORESOURCE_PCI_FIXED; | |
1870 | } | |
1871 | ||
ced04d15 | 1872 | conflict = request_resource_conflict(parent_res, res); |
98a35831 YL |
1873 | |
1874 | if (conflict) | |
1875 | dev_printk(KERN_DEBUG, &b->dev, | |
1876 | "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n", | |
1877 | res, pci_is_root_bus(b) ? "domain " : "", | |
1878 | parent_res, conflict->name, conflict); | |
98a35831 YL |
1879 | |
1880 | return conflict == NULL; | |
1881 | } | |
1882 | ||
1883 | int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max) | |
1884 | { | |
1885 | struct resource *res = &b->busn_res; | |
1886 | struct resource old_res = *res; | |
1887 | resource_size_t size; | |
1888 | int ret; | |
1889 | ||
1890 | if (res->start > bus_max) | |
1891 | return -EINVAL; | |
1892 | ||
1893 | size = bus_max - res->start + 1; | |
1894 | ret = adjust_resource(res, res->start, size); | |
1895 | dev_printk(KERN_DEBUG, &b->dev, | |
1896 | "busn_res: %pR end %s updated to %02x\n", | |
1897 | &old_res, ret ? "can not be" : "is", bus_max); | |
1898 | ||
1899 | if (!ret && !res->parent) | |
1900 | pci_bus_insert_busn_res(b, res->start, res->end); | |
1901 | ||
1902 | return ret; | |
1903 | } | |
1904 | ||
1905 | void pci_bus_release_busn_res(struct pci_bus *b) | |
1906 | { | |
1907 | struct resource *res = &b->busn_res; | |
1908 | int ret; | |
1909 | ||
1910 | if (!res->flags || !res->parent) | |
1911 | return; | |
1912 | ||
1913 | ret = release_resource(res); | |
1914 | dev_printk(KERN_DEBUG, &b->dev, | |
1915 | "busn_res: %pR %s released\n", | |
1916 | res, ret ? "can not be" : "is"); | |
1917 | } | |
1918 | ||
15856ad5 | 1919 | struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, |
a2ebb827 BH |
1920 | struct pci_ops *ops, void *sysdata, struct list_head *resources) |
1921 | { | |
4d99f524 YL |
1922 | struct pci_host_bridge_window *window; |
1923 | bool found = false; | |
a2ebb827 | 1924 | struct pci_bus *b; |
4d99f524 YL |
1925 | int max; |
1926 | ||
1927 | list_for_each_entry(window, resources, list) | |
1928 | if (window->res->flags & IORESOURCE_BUS) { | |
1929 | found = true; | |
1930 | break; | |
1931 | } | |
a2ebb827 BH |
1932 | |
1933 | b = pci_create_root_bus(parent, bus, ops, sysdata, resources); | |
1934 | if (!b) | |
1935 | return NULL; | |
1936 | ||
4d99f524 YL |
1937 | if (!found) { |
1938 | dev_info(&b->dev, | |
1939 | "No busn resource found for root bus, will use [bus %02x-ff]\n", | |
1940 | bus); | |
1941 | pci_bus_insert_busn_res(b, bus, 255); | |
1942 | } | |
1943 | ||
1944 | max = pci_scan_child_bus(b); | |
1945 | ||
1946 | if (!found) | |
1947 | pci_bus_update_busn_res_end(b, max); | |
1948 | ||
a2ebb827 BH |
1949 | pci_bus_add_devices(b); |
1950 | return b; | |
1951 | } | |
1952 | EXPORT_SYMBOL(pci_scan_root_bus); | |
1953 | ||
7e00fe2e | 1954 | /* Deprecated; use pci_scan_root_bus() instead */ |
15856ad5 | 1955 | struct pci_bus *pci_scan_bus_parented(struct device *parent, |
cdb9b9f7 PM |
1956 | int bus, struct pci_ops *ops, void *sysdata) |
1957 | { | |
1e39ae9f | 1958 | LIST_HEAD(resources); |
cdb9b9f7 PM |
1959 | struct pci_bus *b; |
1960 | ||
1e39ae9f BH |
1961 | pci_add_resource(&resources, &ioport_resource); |
1962 | pci_add_resource(&resources, &iomem_resource); | |
857c3b66 | 1963 | pci_add_resource(&resources, &busn_resource); |
1e39ae9f | 1964 | b = pci_create_root_bus(parent, bus, ops, sysdata, &resources); |
cdb9b9f7 | 1965 | if (b) |
857c3b66 | 1966 | pci_scan_child_bus(b); |
1e39ae9f BH |
1967 | else |
1968 | pci_free_resource_list(&resources); | |
cdb9b9f7 PM |
1969 | return b; |
1970 | } | |
1da177e4 LT |
1971 | EXPORT_SYMBOL(pci_scan_bus_parented); |
1972 | ||
15856ad5 | 1973 | struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, |
de4b2f76 BH |
1974 | void *sysdata) |
1975 | { | |
1976 | LIST_HEAD(resources); | |
1977 | struct pci_bus *b; | |
1978 | ||
1979 | pci_add_resource(&resources, &ioport_resource); | |
1980 | pci_add_resource(&resources, &iomem_resource); | |
857c3b66 | 1981 | pci_add_resource(&resources, &busn_resource); |
de4b2f76 BH |
1982 | b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources); |
1983 | if (b) { | |
857c3b66 | 1984 | pci_scan_child_bus(b); |
de4b2f76 BH |
1985 | pci_bus_add_devices(b); |
1986 | } else { | |
1987 | pci_free_resource_list(&resources); | |
1988 | } | |
1989 | return b; | |
1990 | } | |
1991 | EXPORT_SYMBOL(pci_scan_bus); | |
1992 | ||
2f320521 YL |
1993 | /** |
1994 | * pci_rescan_bus_bridge_resize - scan a PCI bus for devices. | |
1995 | * @bridge: PCI bridge for the bus to scan | |
1996 | * | |
1997 | * Scan a PCI bus and child buses for new devices, add them, | |
1998 | * and enable them, resizing bridge mmio/io resource if necessary | |
1999 | * and possible. The caller must ensure the child devices are already | |
2000 | * removed for resizing to occur. | |
2001 | * | |
2002 | * Returns the max number of subordinate bus discovered. | |
2003 | */ | |
10874f5a | 2004 | unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge) |
2f320521 YL |
2005 | { |
2006 | unsigned int max; | |
2007 | struct pci_bus *bus = bridge->subordinate; | |
2008 | ||
2009 | max = pci_scan_child_bus(bus); | |
2010 | ||
2011 | pci_assign_unassigned_bridge_resources(bridge); | |
2012 | ||
2013 | pci_bus_add_devices(bus); | |
2014 | ||
2015 | return max; | |
2016 | } | |
2017 | ||
a5213a31 YL |
2018 | /** |
2019 | * pci_rescan_bus - scan a PCI bus for devices. | |
2020 | * @bus: PCI bus to scan | |
2021 | * | |
2022 | * Scan a PCI bus and child buses for new devices, adds them, | |
2023 | * and enables them. | |
2024 | * | |
2025 | * Returns the max number of subordinate bus discovered. | |
2026 | */ | |
10874f5a | 2027 | unsigned int pci_rescan_bus(struct pci_bus *bus) |
a5213a31 YL |
2028 | { |
2029 | unsigned int max; | |
2030 | ||
2031 | max = pci_scan_child_bus(bus); | |
2032 | pci_assign_unassigned_bus_resources(bus); | |
2033 | pci_bus_add_devices(bus); | |
2034 | ||
2035 | return max; | |
2036 | } | |
2037 | EXPORT_SYMBOL_GPL(pci_rescan_bus); | |
2038 | ||
9d16947b RW |
2039 | /* |
2040 | * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal | |
2041 | * routines should always be executed under this mutex. | |
2042 | */ | |
2043 | static DEFINE_MUTEX(pci_rescan_remove_lock); | |
2044 | ||
2045 | void pci_lock_rescan_remove(void) | |
2046 | { | |
2047 | mutex_lock(&pci_rescan_remove_lock); | |
2048 | } | |
2049 | EXPORT_SYMBOL_GPL(pci_lock_rescan_remove); | |
2050 | ||
2051 | void pci_unlock_rescan_remove(void) | |
2052 | { | |
2053 | mutex_unlock(&pci_rescan_remove_lock); | |
2054 | } | |
2055 | EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove); | |
2056 | ||
3c78bc61 RD |
2057 | static int __init pci_sort_bf_cmp(const struct device *d_a, |
2058 | const struct device *d_b) | |
6b4b78fe | 2059 | { |
99178b03 GKH |
2060 | const struct pci_dev *a = to_pci_dev(d_a); |
2061 | const struct pci_dev *b = to_pci_dev(d_b); | |
2062 | ||
6b4b78fe MD |
2063 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; |
2064 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; | |
2065 | ||
2066 | if (a->bus->number < b->bus->number) return -1; | |
2067 | else if (a->bus->number > b->bus->number) return 1; | |
2068 | ||
2069 | if (a->devfn < b->devfn) return -1; | |
2070 | else if (a->devfn > b->devfn) return 1; | |
2071 | ||
2072 | return 0; | |
2073 | } | |
2074 | ||
5ff580c1 | 2075 | void __init pci_sort_breadthfirst(void) |
6b4b78fe | 2076 | { |
99178b03 | 2077 | bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); |
6b4b78fe | 2078 | } |