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> | |
589fcc23 | 9 | #include <linux/pci_hotplug.h> |
1da177e4 LT |
10 | #include <linux/slab.h> |
11 | #include <linux/module.h> | |
12 | #include <linux/cpumask.h> | |
7d715a6c | 13 | #include <linux/pci-aspm.h> |
284f5f9d | 14 | #include <asm-generic/pci-bridge.h> |
bc56b9e0 | 15 | #include "pci.h" |
1da177e4 LT |
16 | |
17 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ | |
18 | #define CARDBUS_RESERVE_BUSNR 3 | |
1da177e4 | 19 | |
0b950f0f | 20 | static struct resource busn_resource = { |
67cdc827 YL |
21 | .name = "PCI busn", |
22 | .start = 0, | |
23 | .end = 255, | |
24 | .flags = IORESOURCE_BUS, | |
25 | }; | |
26 | ||
1da177e4 LT |
27 | /* Ugh. Need to stop exporting this to modules. */ |
28 | LIST_HEAD(pci_root_buses); | |
29 | EXPORT_SYMBOL(pci_root_buses); | |
30 | ||
5cc62c20 YL |
31 | static LIST_HEAD(pci_domain_busn_res_list); |
32 | ||
33 | struct pci_domain_busn_res { | |
34 | struct list_head list; | |
35 | struct resource res; | |
36 | int domain_nr; | |
37 | }; | |
38 | ||
39 | static struct resource *get_pci_domain_busn_res(int domain_nr) | |
40 | { | |
41 | struct pci_domain_busn_res *r; | |
42 | ||
43 | list_for_each_entry(r, &pci_domain_busn_res_list, list) | |
44 | if (r->domain_nr == domain_nr) | |
45 | return &r->res; | |
46 | ||
47 | r = kzalloc(sizeof(*r), GFP_KERNEL); | |
48 | if (!r) | |
49 | return NULL; | |
50 | ||
51 | r->domain_nr = domain_nr; | |
52 | r->res.start = 0; | |
53 | r->res.end = 0xff; | |
54 | r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED; | |
55 | ||
56 | list_add_tail(&r->list, &pci_domain_busn_res_list); | |
57 | ||
58 | return &r->res; | |
59 | } | |
60 | ||
70308923 GKH |
61 | static int find_anything(struct device *dev, void *data) |
62 | { | |
63 | return 1; | |
64 | } | |
1da177e4 | 65 | |
ed4aaadb ZY |
66 | /* |
67 | * Some device drivers need know if pci is initiated. | |
68 | * Basically, we think pci is not initiated when there | |
70308923 | 69 | * is no device to be found on the pci_bus_type. |
ed4aaadb ZY |
70 | */ |
71 | int no_pci_devices(void) | |
72 | { | |
70308923 GKH |
73 | struct device *dev; |
74 | int no_devices; | |
ed4aaadb | 75 | |
70308923 GKH |
76 | dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); |
77 | no_devices = (dev == NULL); | |
78 | put_device(dev); | |
79 | return no_devices; | |
80 | } | |
ed4aaadb ZY |
81 | EXPORT_SYMBOL(no_pci_devices); |
82 | ||
1da177e4 LT |
83 | /* |
84 | * PCI Bus Class | |
85 | */ | |
fd7d1ced | 86 | static void release_pcibus_dev(struct device *dev) |
1da177e4 | 87 | { |
fd7d1ced | 88 | struct pci_bus *pci_bus = to_pci_bus(dev); |
1da177e4 LT |
89 | |
90 | if (pci_bus->bridge) | |
91 | put_device(pci_bus->bridge); | |
2fe2abf8 | 92 | pci_bus_remove_resources(pci_bus); |
98d9f30c | 93 | pci_release_bus_of_node(pci_bus); |
1da177e4 LT |
94 | kfree(pci_bus); |
95 | } | |
96 | ||
97 | static struct class pcibus_class = { | |
98 | .name = "pci_bus", | |
fd7d1ced | 99 | .dev_release = &release_pcibus_dev, |
56039e65 | 100 | .dev_groups = pcibus_groups, |
1da177e4 LT |
101 | }; |
102 | ||
103 | static int __init pcibus_class_init(void) | |
104 | { | |
105 | return class_register(&pcibus_class); | |
106 | } | |
107 | postcore_initcall(pcibus_class_init); | |
108 | ||
6ac665c6 | 109 | static u64 pci_size(u64 base, u64 maxbase, u64 mask) |
1da177e4 | 110 | { |
6ac665c6 | 111 | u64 size = mask & maxbase; /* Find the significant bits */ |
1da177e4 LT |
112 | if (!size) |
113 | return 0; | |
114 | ||
115 | /* Get the lowest of them to find the decode size, and | |
116 | from that the extent. */ | |
117 | size = (size & ~(size-1)) - 1; | |
118 | ||
119 | /* base == maxbase can be valid only if the BAR has | |
120 | already been programmed with all 1s. */ | |
121 | if (base == maxbase && ((base | size) & mask) != mask) | |
122 | return 0; | |
123 | ||
124 | return size; | |
125 | } | |
126 | ||
28c6821a | 127 | static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar) |
6ac665c6 | 128 | { |
8d6a6a47 | 129 | u32 mem_type; |
28c6821a | 130 | unsigned long flags; |
8d6a6a47 | 131 | |
6ac665c6 | 132 | if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { |
28c6821a BH |
133 | flags = bar & ~PCI_BASE_ADDRESS_IO_MASK; |
134 | flags |= IORESOURCE_IO; | |
135 | return flags; | |
6ac665c6 | 136 | } |
07eddf3d | 137 | |
28c6821a BH |
138 | flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK; |
139 | flags |= IORESOURCE_MEM; | |
140 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) | |
141 | flags |= IORESOURCE_PREFETCH; | |
07eddf3d | 142 | |
8d6a6a47 BH |
143 | mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK; |
144 | switch (mem_type) { | |
145 | case PCI_BASE_ADDRESS_MEM_TYPE_32: | |
146 | break; | |
147 | case PCI_BASE_ADDRESS_MEM_TYPE_1M: | |
0ff9514b | 148 | /* 1M mem BAR treated as 32-bit BAR */ |
8d6a6a47 BH |
149 | break; |
150 | case PCI_BASE_ADDRESS_MEM_TYPE_64: | |
28c6821a BH |
151 | flags |= IORESOURCE_MEM_64; |
152 | break; | |
8d6a6a47 | 153 | default: |
0ff9514b | 154 | /* mem unknown type treated as 32-bit BAR */ |
8d6a6a47 BH |
155 | break; |
156 | } | |
28c6821a | 157 | return flags; |
07eddf3d YL |
158 | } |
159 | ||
808e34e2 ZK |
160 | #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO) |
161 | ||
0b400c7e YZ |
162 | /** |
163 | * pci_read_base - read a PCI BAR | |
164 | * @dev: the PCI device | |
165 | * @type: type of the BAR | |
166 | * @res: resource buffer to be filled in | |
167 | * @pos: BAR position in the config space | |
168 | * | |
169 | * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. | |
6ac665c6 | 170 | */ |
0b400c7e | 171 | int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, |
3c78bc61 | 172 | struct resource *res, unsigned int pos) |
07eddf3d | 173 | { |
6ac665c6 | 174 | u32 l, sz, mask; |
23b13bc7 | 175 | u64 l64, sz64, mask64; |
253d2e54 | 176 | u16 orig_cmd; |
cf4d1cf5 | 177 | struct pci_bus_region region, inverted_region; |
26370fc6 | 178 | bool bar_too_big = false, bar_too_high = false, bar_invalid = false; |
6ac665c6 | 179 | |
1ed67439 | 180 | mask = type ? PCI_ROM_ADDRESS_MASK : ~0; |
6ac665c6 | 181 | |
0ff9514b | 182 | /* No printks while decoding is disabled! */ |
253d2e54 JP |
183 | if (!dev->mmio_always_on) { |
184 | pci_read_config_word(dev, PCI_COMMAND, &orig_cmd); | |
808e34e2 ZK |
185 | if (orig_cmd & PCI_COMMAND_DECODE_ENABLE) { |
186 | pci_write_config_word(dev, PCI_COMMAND, | |
187 | orig_cmd & ~PCI_COMMAND_DECODE_ENABLE); | |
188 | } | |
253d2e54 JP |
189 | } |
190 | ||
6ac665c6 MW |
191 | res->name = pci_name(dev); |
192 | ||
193 | pci_read_config_dword(dev, pos, &l); | |
1ed67439 | 194 | pci_write_config_dword(dev, pos, l | mask); |
6ac665c6 MW |
195 | pci_read_config_dword(dev, pos, &sz); |
196 | pci_write_config_dword(dev, pos, l); | |
197 | ||
198 | /* | |
199 | * All bits set in sz means the device isn't working properly. | |
45aa23b4 BH |
200 | * If the BAR isn't implemented, all bits must be 0. If it's a |
201 | * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit | |
202 | * 1 must be clear. | |
6ac665c6 | 203 | */ |
45aa23b4 | 204 | if (!sz || sz == 0xffffffff) |
6ac665c6 MW |
205 | goto fail; |
206 | ||
207 | /* | |
208 | * I don't know how l can have all bits set. Copied from old code. | |
209 | * Maybe it fixes a bug on some ancient platform. | |
210 | */ | |
211 | if (l == 0xffffffff) | |
212 | l = 0; | |
213 | ||
214 | if (type == pci_bar_unknown) { | |
28c6821a BH |
215 | res->flags = decode_bar(dev, l); |
216 | res->flags |= IORESOURCE_SIZEALIGN; | |
217 | if (res->flags & IORESOURCE_IO) { | |
6ac665c6 | 218 | l &= PCI_BASE_ADDRESS_IO_MASK; |
5aceca9d | 219 | mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT; |
6ac665c6 MW |
220 | } else { |
221 | l &= PCI_BASE_ADDRESS_MEM_MASK; | |
222 | mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; | |
223 | } | |
224 | } else { | |
225 | res->flags |= (l & IORESOURCE_ROM_ENABLE); | |
226 | l &= PCI_ROM_ADDRESS_MASK; | |
227 | mask = (u32)PCI_ROM_ADDRESS_MASK; | |
228 | } | |
229 | ||
28c6821a | 230 | if (res->flags & IORESOURCE_MEM_64) { |
23b13bc7 BH |
231 | l64 = l; |
232 | sz64 = sz; | |
233 | mask64 = mask | (u64)~0 << 32; | |
6ac665c6 MW |
234 | |
235 | pci_read_config_dword(dev, pos + 4, &l); | |
236 | pci_write_config_dword(dev, pos + 4, ~0); | |
237 | pci_read_config_dword(dev, pos + 4, &sz); | |
238 | pci_write_config_dword(dev, pos + 4, l); | |
239 | ||
240 | l64 |= ((u64)l << 32); | |
241 | sz64 |= ((u64)sz << 32); | |
242 | ||
243 | sz64 = pci_size(l64, sz64, mask64); | |
244 | ||
245 | if (!sz64) | |
246 | goto fail; | |
247 | ||
23b13bc7 BH |
248 | if ((sizeof(dma_addr_t) < 8 || sizeof(resource_size_t) < 8) && |
249 | sz64 > 0x100000000ULL) { | |
250 | res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED; | |
251 | res->start = 0; | |
252 | res->end = 0; | |
0ff9514b | 253 | bar_too_big = true; |
23b13bc7 | 254 | goto out; |
c7dabef8 BH |
255 | } |
256 | ||
d1a313e4 | 257 | if ((sizeof(dma_addr_t) < 8) && l) { |
31e9dd25 | 258 | /* Above 32-bit boundary; try to reallocate */ |
c83bd900 | 259 | res->flags |= IORESOURCE_UNSET; |
72dc5601 BH |
260 | res->start = 0; |
261 | res->end = sz64; | |
31e9dd25 | 262 | bar_too_high = true; |
72dc5601 | 263 | goto out; |
6ac665c6 | 264 | } else { |
5bfa14ed BH |
265 | region.start = l64; |
266 | region.end = l64 + sz64; | |
6ac665c6 MW |
267 | } |
268 | } else { | |
45aa23b4 | 269 | sz = pci_size(l, sz, mask); |
6ac665c6 | 270 | |
45aa23b4 | 271 | if (!sz) |
6ac665c6 MW |
272 | goto fail; |
273 | ||
5bfa14ed BH |
274 | region.start = l; |
275 | region.end = l + sz; | |
6ac665c6 MW |
276 | } |
277 | ||
fc279850 YL |
278 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
279 | pcibios_resource_to_bus(dev->bus, &inverted_region, res); | |
cf4d1cf5 KH |
280 | |
281 | /* | |
282 | * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is | |
283 | * the corresponding resource address (the physical address used by | |
284 | * the CPU. Converting that resource address back to a bus address | |
285 | * should yield the original BAR value: | |
286 | * | |
287 | * resource_to_bus(bus_to_resource(A)) == A | |
288 | * | |
289 | * If it doesn't, CPU accesses to "bus_to_resource(A)" will not | |
290 | * be claimed by the device. | |
291 | */ | |
292 | if (inverted_region.start != region.start) { | |
cf4d1cf5 | 293 | res->flags |= IORESOURCE_UNSET; |
cf4d1cf5 | 294 | res->start = 0; |
26370fc6 BH |
295 | res->end = region.end - region.start; |
296 | bar_invalid = true; | |
cf4d1cf5 | 297 | } |
96ddef25 | 298 | |
0ff9514b BH |
299 | goto out; |
300 | ||
301 | ||
302 | fail: | |
303 | res->flags = 0; | |
304 | out: | |
808e34e2 ZK |
305 | if (!dev->mmio_always_on && |
306 | (orig_cmd & PCI_COMMAND_DECODE_ENABLE)) | |
bbffe435 BH |
307 | pci_write_config_word(dev, PCI_COMMAND, orig_cmd); |
308 | ||
0ff9514b | 309 | if (bar_too_big) |
23b13bc7 BH |
310 | dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n", |
311 | pos, (unsigned long long) sz64); | |
31e9dd25 BH |
312 | if (bar_too_high) |
313 | dev_info(&dev->dev, "reg 0x%x: can't handle BAR above 4G (bus address %#010llx)\n", | |
314 | pos, (unsigned long long) l64); | |
26370fc6 BH |
315 | if (bar_invalid) |
316 | dev_info(&dev->dev, "reg 0x%x: initial BAR value %#010llx invalid\n", | |
317 | pos, (unsigned long long) region.start); | |
31e9dd25 | 318 | if (res->flags) |
33963e30 | 319 | dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res); |
0ff9514b | 320 | |
28c6821a | 321 | return (res->flags & IORESOURCE_MEM_64) ? 1 : 0; |
07eddf3d YL |
322 | } |
323 | ||
1da177e4 LT |
324 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
325 | { | |
6ac665c6 | 326 | unsigned int pos, reg; |
07eddf3d | 327 | |
6ac665c6 MW |
328 | for (pos = 0; pos < howmany; pos++) { |
329 | struct resource *res = &dev->resource[pos]; | |
1da177e4 | 330 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); |
6ac665c6 | 331 | pos += __pci_read_base(dev, pci_bar_unknown, res, reg); |
1da177e4 | 332 | } |
6ac665c6 | 333 | |
1da177e4 | 334 | if (rom) { |
6ac665c6 | 335 | struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; |
1da177e4 | 336 | dev->rom_base_reg = rom; |
6ac665c6 MW |
337 | res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | |
338 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE | | |
339 | IORESOURCE_SIZEALIGN; | |
340 | __pci_read_base(dev, pci_bar_mem32, res, rom); | |
1da177e4 LT |
341 | } |
342 | } | |
343 | ||
15856ad5 | 344 | static void pci_read_bridge_io(struct pci_bus *child) |
1da177e4 LT |
345 | { |
346 | struct pci_dev *dev = child->self; | |
347 | u8 io_base_lo, io_limit_lo; | |
2b28ae19 | 348 | unsigned long io_mask, io_granularity, base, limit; |
5bfa14ed | 349 | struct pci_bus_region region; |
2b28ae19 BH |
350 | struct resource *res; |
351 | ||
352 | io_mask = PCI_IO_RANGE_MASK; | |
353 | io_granularity = 0x1000; | |
354 | if (dev->io_window_1k) { | |
355 | /* Support 1K I/O space granularity */ | |
356 | io_mask = PCI_IO_1K_RANGE_MASK; | |
357 | io_granularity = 0x400; | |
358 | } | |
1da177e4 | 359 | |
1da177e4 LT |
360 | res = child->resource[0]; |
361 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); | |
362 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); | |
2b28ae19 BH |
363 | base = (io_base_lo & io_mask) << 8; |
364 | limit = (io_limit_lo & io_mask) << 8; | |
1da177e4 LT |
365 | |
366 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { | |
367 | u16 io_base_hi, io_limit_hi; | |
8f38eaca | 368 | |
1da177e4 LT |
369 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); |
370 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); | |
8f38eaca BH |
371 | base |= ((unsigned long) io_base_hi << 16); |
372 | limit |= ((unsigned long) io_limit_hi << 16); | |
1da177e4 LT |
373 | } |
374 | ||
5dde383e | 375 | if (base <= limit) { |
1da177e4 | 376 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; |
5bfa14ed | 377 | region.start = base; |
2b28ae19 | 378 | region.end = limit + io_granularity - 1; |
fc279850 | 379 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
c7dabef8 | 380 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 | 381 | } |
fa27b2d1 BH |
382 | } |
383 | ||
15856ad5 | 384 | static void pci_read_bridge_mmio(struct pci_bus *child) |
fa27b2d1 BH |
385 | { |
386 | struct pci_dev *dev = child->self; | |
387 | u16 mem_base_lo, mem_limit_lo; | |
388 | unsigned long base, limit; | |
5bfa14ed | 389 | struct pci_bus_region region; |
fa27b2d1 | 390 | struct resource *res; |
1da177e4 LT |
391 | |
392 | res = child->resource[1]; | |
393 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); | |
394 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); | |
8f38eaca BH |
395 | base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; |
396 | limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
5dde383e | 397 | if (base <= limit) { |
1da177e4 | 398 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; |
5bfa14ed BH |
399 | region.start = base; |
400 | region.end = limit + 0xfffff; | |
fc279850 | 401 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
c7dabef8 | 402 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 | 403 | } |
fa27b2d1 BH |
404 | } |
405 | ||
15856ad5 | 406 | static void pci_read_bridge_mmio_pref(struct pci_bus *child) |
fa27b2d1 BH |
407 | { |
408 | struct pci_dev *dev = child->self; | |
409 | u16 mem_base_lo, mem_limit_lo; | |
410 | unsigned long base, limit; | |
5bfa14ed | 411 | struct pci_bus_region region; |
fa27b2d1 | 412 | struct resource *res; |
1da177e4 LT |
413 | |
414 | res = child->resource[2]; | |
415 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); | |
416 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); | |
8f38eaca BH |
417 | base = ((unsigned long) mem_base_lo & PCI_PREF_RANGE_MASK) << 16; |
418 | limit = ((unsigned long) mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; | |
1da177e4 LT |
419 | |
420 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { | |
421 | u32 mem_base_hi, mem_limit_hi; | |
8f38eaca | 422 | |
1da177e4 LT |
423 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); |
424 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); | |
425 | ||
426 | /* | |
427 | * Some bridges set the base > limit by default, and some | |
428 | * (broken) BIOSes do not initialize them. If we find | |
429 | * this, just assume they are not being used. | |
430 | */ | |
431 | if (mem_base_hi <= mem_limit_hi) { | |
432 | #if BITS_PER_LONG == 64 | |
8f38eaca BH |
433 | base |= ((unsigned long) mem_base_hi) << 32; |
434 | limit |= ((unsigned long) mem_limit_hi) << 32; | |
1da177e4 LT |
435 | #else |
436 | if (mem_base_hi || mem_limit_hi) { | |
227f0647 | 437 | dev_err(&dev->dev, "can't handle 64-bit address space for bridge\n"); |
1da177e4 LT |
438 | return; |
439 | } | |
440 | #endif | |
441 | } | |
442 | } | |
5dde383e | 443 | if (base <= limit) { |
1f82de10 YL |
444 | res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | |
445 | IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
446 | if (res->flags & PCI_PREF_RANGE_TYPE_64) | |
447 | res->flags |= IORESOURCE_MEM_64; | |
5bfa14ed BH |
448 | region.start = base; |
449 | region.end = limit + 0xfffff; | |
fc279850 | 450 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
c7dabef8 | 451 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 LT |
452 | } |
453 | } | |
454 | ||
15856ad5 | 455 | void pci_read_bridge_bases(struct pci_bus *child) |
fa27b2d1 BH |
456 | { |
457 | struct pci_dev *dev = child->self; | |
2fe2abf8 | 458 | struct resource *res; |
fa27b2d1 BH |
459 | int i; |
460 | ||
461 | if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ | |
462 | return; | |
463 | ||
b918c62e YL |
464 | dev_info(&dev->dev, "PCI bridge to %pR%s\n", |
465 | &child->busn_res, | |
fa27b2d1 BH |
466 | dev->transparent ? " (subtractive decode)" : ""); |
467 | ||
2fe2abf8 BH |
468 | pci_bus_remove_resources(child); |
469 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
470 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; | |
471 | ||
fa27b2d1 BH |
472 | pci_read_bridge_io(child); |
473 | pci_read_bridge_mmio(child); | |
474 | pci_read_bridge_mmio_pref(child); | |
2adf7516 BH |
475 | |
476 | if (dev->transparent) { | |
2fe2abf8 | 477 | pci_bus_for_each_resource(child->parent, res, i) { |
d739a099 | 478 | if (res && res->flags) { |
2fe2abf8 BH |
479 | pci_bus_add_resource(child, res, |
480 | PCI_SUBTRACTIVE_DECODE); | |
2adf7516 BH |
481 | dev_printk(KERN_DEBUG, &dev->dev, |
482 | " bridge window %pR (subtractive decode)\n", | |
2fe2abf8 BH |
483 | res); |
484 | } | |
2adf7516 BH |
485 | } |
486 | } | |
fa27b2d1 BH |
487 | } |
488 | ||
05013486 | 489 | static struct pci_bus *pci_alloc_bus(void) |
1da177e4 LT |
490 | { |
491 | struct pci_bus *b; | |
492 | ||
f5afe806 | 493 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
05013486 BH |
494 | if (!b) |
495 | return NULL; | |
496 | ||
497 | INIT_LIST_HEAD(&b->node); | |
498 | INIT_LIST_HEAD(&b->children); | |
499 | INIT_LIST_HEAD(&b->devices); | |
500 | INIT_LIST_HEAD(&b->slots); | |
501 | INIT_LIST_HEAD(&b->resources); | |
502 | b->max_bus_speed = PCI_SPEED_UNKNOWN; | |
503 | b->cur_bus_speed = PCI_SPEED_UNKNOWN; | |
1da177e4 LT |
504 | return b; |
505 | } | |
506 | ||
70efde2a JL |
507 | static void pci_release_host_bridge_dev(struct device *dev) |
508 | { | |
509 | struct pci_host_bridge *bridge = to_pci_host_bridge(dev); | |
510 | ||
511 | if (bridge->release_fn) | |
512 | bridge->release_fn(bridge); | |
513 | ||
514 | pci_free_resource_list(&bridge->windows); | |
515 | ||
516 | kfree(bridge); | |
517 | } | |
518 | ||
7b543663 YL |
519 | static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) |
520 | { | |
521 | struct pci_host_bridge *bridge; | |
522 | ||
523 | bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); | |
05013486 BH |
524 | if (!bridge) |
525 | return NULL; | |
7b543663 | 526 | |
05013486 BH |
527 | INIT_LIST_HEAD(&bridge->windows); |
528 | bridge->bus = b; | |
7b543663 YL |
529 | return bridge; |
530 | } | |
531 | ||
0b950f0f | 532 | static const unsigned char pcix_bus_speed[] = { |
9be60ca0 MW |
533 | PCI_SPEED_UNKNOWN, /* 0 */ |
534 | PCI_SPEED_66MHz_PCIX, /* 1 */ | |
535 | PCI_SPEED_100MHz_PCIX, /* 2 */ | |
536 | PCI_SPEED_133MHz_PCIX, /* 3 */ | |
537 | PCI_SPEED_UNKNOWN, /* 4 */ | |
538 | PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ | |
539 | PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ | |
540 | PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ | |
541 | PCI_SPEED_UNKNOWN, /* 8 */ | |
542 | PCI_SPEED_66MHz_PCIX_266, /* 9 */ | |
543 | PCI_SPEED_100MHz_PCIX_266, /* A */ | |
544 | PCI_SPEED_133MHz_PCIX_266, /* B */ | |
545 | PCI_SPEED_UNKNOWN, /* C */ | |
546 | PCI_SPEED_66MHz_PCIX_533, /* D */ | |
547 | PCI_SPEED_100MHz_PCIX_533, /* E */ | |
548 | PCI_SPEED_133MHz_PCIX_533 /* F */ | |
549 | }; | |
550 | ||
343e51ae | 551 | const unsigned char pcie_link_speed[] = { |
3749c51a MW |
552 | PCI_SPEED_UNKNOWN, /* 0 */ |
553 | PCIE_SPEED_2_5GT, /* 1 */ | |
554 | PCIE_SPEED_5_0GT, /* 2 */ | |
9dfd97fe | 555 | PCIE_SPEED_8_0GT, /* 3 */ |
3749c51a MW |
556 | PCI_SPEED_UNKNOWN, /* 4 */ |
557 | PCI_SPEED_UNKNOWN, /* 5 */ | |
558 | PCI_SPEED_UNKNOWN, /* 6 */ | |
559 | PCI_SPEED_UNKNOWN, /* 7 */ | |
560 | PCI_SPEED_UNKNOWN, /* 8 */ | |
561 | PCI_SPEED_UNKNOWN, /* 9 */ | |
562 | PCI_SPEED_UNKNOWN, /* A */ | |
563 | PCI_SPEED_UNKNOWN, /* B */ | |
564 | PCI_SPEED_UNKNOWN, /* C */ | |
565 | PCI_SPEED_UNKNOWN, /* D */ | |
566 | PCI_SPEED_UNKNOWN, /* E */ | |
567 | PCI_SPEED_UNKNOWN /* F */ | |
568 | }; | |
569 | ||
570 | void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) | |
571 | { | |
231afea1 | 572 | bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS]; |
3749c51a MW |
573 | } |
574 | EXPORT_SYMBOL_GPL(pcie_update_link_speed); | |
575 | ||
45b4cdd5 MW |
576 | static unsigned char agp_speeds[] = { |
577 | AGP_UNKNOWN, | |
578 | AGP_1X, | |
579 | AGP_2X, | |
580 | AGP_4X, | |
581 | AGP_8X | |
582 | }; | |
583 | ||
584 | static enum pci_bus_speed agp_speed(int agp3, int agpstat) | |
585 | { | |
586 | int index = 0; | |
587 | ||
588 | if (agpstat & 4) | |
589 | index = 3; | |
590 | else if (agpstat & 2) | |
591 | index = 2; | |
592 | else if (agpstat & 1) | |
593 | index = 1; | |
594 | else | |
595 | goto out; | |
f7625980 | 596 | |
45b4cdd5 MW |
597 | if (agp3) { |
598 | index += 2; | |
599 | if (index == 5) | |
600 | index = 0; | |
601 | } | |
602 | ||
603 | out: | |
604 | return agp_speeds[index]; | |
605 | } | |
606 | ||
9be60ca0 MW |
607 | static void pci_set_bus_speed(struct pci_bus *bus) |
608 | { | |
609 | struct pci_dev *bridge = bus->self; | |
610 | int pos; | |
611 | ||
45b4cdd5 MW |
612 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); |
613 | if (!pos) | |
614 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); | |
615 | if (pos) { | |
616 | u32 agpstat, agpcmd; | |
617 | ||
618 | pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); | |
619 | bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); | |
620 | ||
621 | pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); | |
622 | bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); | |
623 | } | |
624 | ||
9be60ca0 MW |
625 | pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); |
626 | if (pos) { | |
627 | u16 status; | |
628 | enum pci_bus_speed max; | |
9be60ca0 | 629 | |
7793eeab BH |
630 | pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS, |
631 | &status); | |
632 | ||
633 | if (status & PCI_X_SSTATUS_533MHZ) { | |
9be60ca0 | 634 | max = PCI_SPEED_133MHz_PCIX_533; |
7793eeab | 635 | } else if (status & PCI_X_SSTATUS_266MHZ) { |
9be60ca0 | 636 | max = PCI_SPEED_133MHz_PCIX_266; |
7793eeab | 637 | } else if (status & PCI_X_SSTATUS_133MHZ) { |
3c78bc61 | 638 | if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) |
9be60ca0 | 639 | max = PCI_SPEED_133MHz_PCIX_ECC; |
3c78bc61 | 640 | else |
9be60ca0 | 641 | max = PCI_SPEED_133MHz_PCIX; |
9be60ca0 MW |
642 | } else { |
643 | max = PCI_SPEED_66MHz_PCIX; | |
644 | } | |
645 | ||
646 | bus->max_bus_speed = max; | |
7793eeab BH |
647 | bus->cur_bus_speed = pcix_bus_speed[ |
648 | (status & PCI_X_SSTATUS_FREQ) >> 6]; | |
9be60ca0 MW |
649 | |
650 | return; | |
651 | } | |
652 | ||
fdfe1511 | 653 | if (pci_is_pcie(bridge)) { |
9be60ca0 MW |
654 | u32 linkcap; |
655 | u16 linksta; | |
656 | ||
59875ae4 | 657 | pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap); |
231afea1 | 658 | bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS]; |
9be60ca0 | 659 | |
59875ae4 | 660 | pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta); |
9be60ca0 MW |
661 | pcie_update_link_speed(bus, linksta); |
662 | } | |
663 | } | |
664 | ||
cbd4e055 AB |
665 | static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, |
666 | struct pci_dev *bridge, int busnr) | |
1da177e4 LT |
667 | { |
668 | struct pci_bus *child; | |
669 | int i; | |
4f535093 | 670 | int ret; |
1da177e4 LT |
671 | |
672 | /* | |
673 | * Allocate a new bus, and inherit stuff from the parent.. | |
674 | */ | |
675 | child = pci_alloc_bus(); | |
676 | if (!child) | |
677 | return NULL; | |
678 | ||
1da177e4 LT |
679 | child->parent = parent; |
680 | child->ops = parent->ops; | |
0cbdcfcf | 681 | child->msi = parent->msi; |
1da177e4 | 682 | child->sysdata = parent->sysdata; |
6e325a62 | 683 | child->bus_flags = parent->bus_flags; |
1da177e4 | 684 | |
fd7d1ced | 685 | /* initialize some portions of the bus device, but don't register it |
4f535093 | 686 | * now as the parent is not properly set up yet. |
fd7d1ced GKH |
687 | */ |
688 | child->dev.class = &pcibus_class; | |
1a927133 | 689 | dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); |
1da177e4 LT |
690 | |
691 | /* | |
692 | * Set up the primary, secondary and subordinate | |
693 | * bus numbers. | |
694 | */ | |
b918c62e YL |
695 | child->number = child->busn_res.start = busnr; |
696 | child->primary = parent->busn_res.start; | |
697 | child->busn_res.end = 0xff; | |
1da177e4 | 698 | |
4f535093 YL |
699 | if (!bridge) { |
700 | child->dev.parent = parent->bridge; | |
701 | goto add_dev; | |
702 | } | |
3789fa8a YZ |
703 | |
704 | child->self = bridge; | |
705 | child->bridge = get_device(&bridge->dev); | |
4f535093 | 706 | child->dev.parent = child->bridge; |
98d9f30c | 707 | pci_set_bus_of_node(child); |
9be60ca0 MW |
708 | pci_set_bus_speed(child); |
709 | ||
1da177e4 | 710 | /* Set up default resource pointers and names.. */ |
fde09c6d | 711 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { |
1da177e4 LT |
712 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; |
713 | child->resource[i]->name = child->name; | |
714 | } | |
715 | bridge->subordinate = child; | |
716 | ||
4f535093 YL |
717 | add_dev: |
718 | ret = device_register(&child->dev); | |
719 | WARN_ON(ret < 0); | |
720 | ||
10a95747 JL |
721 | pcibios_add_bus(child); |
722 | ||
4f535093 YL |
723 | /* Create legacy_io and legacy_mem files for this bus */ |
724 | pci_create_legacy_files(child); | |
725 | ||
1da177e4 LT |
726 | return child; |
727 | } | |
728 | ||
3c78bc61 RD |
729 | struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, |
730 | int busnr) | |
1da177e4 LT |
731 | { |
732 | struct pci_bus *child; | |
733 | ||
734 | child = pci_alloc_child_bus(parent, dev, busnr); | |
e4ea9bb7 | 735 | if (child) { |
d71374da | 736 | down_write(&pci_bus_sem); |
1da177e4 | 737 | list_add_tail(&child->node, &parent->children); |
d71374da | 738 | up_write(&pci_bus_sem); |
e4ea9bb7 | 739 | } |
1da177e4 LT |
740 | return child; |
741 | } | |
b7fe9434 | 742 | EXPORT_SYMBOL(pci_add_new_bus); |
1da177e4 | 743 | |
1da177e4 LT |
744 | /* |
745 | * If it's a bridge, configure it and scan the bus behind it. | |
746 | * For CardBus bridges, we don't scan behind as the devices will | |
747 | * be handled by the bridge driver itself. | |
748 | * | |
749 | * We need to process bridges in two passes -- first we scan those | |
750 | * already configured by the BIOS and after we are done with all of | |
751 | * them, we proceed to assigning numbers to the remaining buses in | |
752 | * order to avoid overlaps between old and new bus numbers. | |
753 | */ | |
15856ad5 | 754 | int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) |
1da177e4 LT |
755 | { |
756 | struct pci_bus *child; | |
757 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); | |
49887941 | 758 | u32 buses, i, j = 0; |
1da177e4 | 759 | u16 bctl; |
99ddd552 | 760 | u8 primary, secondary, subordinate; |
a1c19894 | 761 | int broken = 0; |
1da177e4 LT |
762 | |
763 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); | |
99ddd552 BH |
764 | primary = buses & 0xFF; |
765 | secondary = (buses >> 8) & 0xFF; | |
766 | subordinate = (buses >> 16) & 0xFF; | |
1da177e4 | 767 | |
99ddd552 BH |
768 | dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", |
769 | secondary, subordinate, pass); | |
1da177e4 | 770 | |
71f6bd4a YL |
771 | if (!primary && (primary != bus->number) && secondary && subordinate) { |
772 | dev_warn(&dev->dev, "Primary bus is hard wired to 0\n"); | |
773 | primary = bus->number; | |
774 | } | |
775 | ||
a1c19894 BH |
776 | /* Check if setup is sensible at all */ |
777 | if (!pass && | |
1965f66e | 778 | (primary != bus->number || secondary <= bus->number || |
1820ffdc | 779 | secondary > subordinate || subordinate > bus->busn_res.end)) { |
1965f66e YL |
780 | dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n", |
781 | secondary, subordinate); | |
a1c19894 BH |
782 | broken = 1; |
783 | } | |
784 | ||
1da177e4 | 785 | /* Disable MasterAbortMode during probing to avoid reporting |
f7625980 | 786 | of bus errors (in some architectures) */ |
1da177e4 LT |
787 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); |
788 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, | |
789 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); | |
790 | ||
99ddd552 BH |
791 | if ((secondary || subordinate) && !pcibios_assign_all_busses() && |
792 | !is_cardbus && !broken) { | |
793 | unsigned int cmax; | |
1da177e4 LT |
794 | /* |
795 | * Bus already configured by firmware, process it in the first | |
796 | * pass and just note the configuration. | |
797 | */ | |
798 | if (pass) | |
bbe8f9a3 | 799 | goto out; |
1da177e4 LT |
800 | |
801 | /* | |
2ed85823 AN |
802 | * The bus might already exist for two reasons: Either we are |
803 | * rescanning the bus or the bus is reachable through more than | |
804 | * one bridge. The second case can happen with the i450NX | |
805 | * chipset. | |
1da177e4 | 806 | */ |
99ddd552 | 807 | child = pci_find_bus(pci_domain_nr(bus), secondary); |
74710ded | 808 | if (!child) { |
99ddd552 | 809 | child = pci_add_new_bus(bus, dev, secondary); |
74710ded AC |
810 | if (!child) |
811 | goto out; | |
99ddd552 | 812 | child->primary = primary; |
bc76b731 | 813 | pci_bus_insert_busn_res(child, secondary, subordinate); |
74710ded | 814 | child->bridge_ctl = bctl; |
1da177e4 LT |
815 | } |
816 | ||
1da177e4 | 817 | cmax = pci_scan_child_bus(child); |
c95b0bd6 AN |
818 | if (cmax > subordinate) |
819 | dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n", | |
820 | subordinate, cmax); | |
821 | /* subordinate should equal child->busn_res.end */ | |
822 | if (subordinate > max) | |
823 | max = subordinate; | |
1da177e4 LT |
824 | } else { |
825 | /* | |
826 | * We need to assign a number to this bus which we always | |
827 | * do in the second pass. | |
828 | */ | |
12f44f46 | 829 | if (!pass) { |
619c8c31 | 830 | if (pcibios_assign_all_busses() || broken || is_cardbus) |
12f44f46 IK |
831 | /* Temporarily disable forwarding of the |
832 | configuration cycles on all bridges in | |
833 | this bus segment to avoid possible | |
834 | conflicts in the second pass between two | |
835 | bridges programmed with overlapping | |
836 | bus ranges. */ | |
837 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, | |
838 | buses & ~0xffffff); | |
bbe8f9a3 | 839 | goto out; |
12f44f46 | 840 | } |
1da177e4 | 841 | |
fc1b2531 AN |
842 | if (max >= bus->busn_res.end) { |
843 | dev_warn(&dev->dev, "can't allocate child bus %02x from %pR\n", | |
844 | max, &bus->busn_res); | |
845 | goto out; | |
846 | } | |
847 | ||
1da177e4 LT |
848 | /* Clear errors */ |
849 | pci_write_config_word(dev, PCI_STATUS, 0xffff); | |
850 | ||
fc1b2531 | 851 | /* The bus will already exist if we are rescanning */ |
b1a98b69 TC |
852 | child = pci_find_bus(pci_domain_nr(bus), max+1); |
853 | if (!child) { | |
9a4d7d87 | 854 | child = pci_add_new_bus(bus, dev, max+1); |
b1a98b69 TC |
855 | if (!child) |
856 | goto out; | |
1820ffdc AN |
857 | pci_bus_insert_busn_res(child, max+1, |
858 | bus->busn_res.end); | |
b1a98b69 | 859 | } |
9a4d7d87 | 860 | max++; |
1da177e4 LT |
861 | buses = (buses & 0xff000000) |
862 | | ((unsigned int)(child->primary) << 0) | |
b918c62e YL |
863 | | ((unsigned int)(child->busn_res.start) << 8) |
864 | | ((unsigned int)(child->busn_res.end) << 16); | |
1da177e4 LT |
865 | |
866 | /* | |
867 | * yenta.c forces a secondary latency timer of 176. | |
868 | * Copy that behaviour here. | |
869 | */ | |
870 | if (is_cardbus) { | |
871 | buses &= ~0xff000000; | |
872 | buses |= CARDBUS_LATENCY_TIMER << 24; | |
873 | } | |
7c867c88 | 874 | |
1da177e4 LT |
875 | /* |
876 | * We need to blast all three values with a single write. | |
877 | */ | |
878 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); | |
879 | ||
880 | if (!is_cardbus) { | |
11949255 | 881 | child->bridge_ctl = bctl; |
1da177e4 LT |
882 | max = pci_scan_child_bus(child); |
883 | } else { | |
884 | /* | |
885 | * For CardBus bridges, we leave 4 bus numbers | |
886 | * as cards with a PCI-to-PCI bridge can be | |
887 | * inserted later. | |
888 | */ | |
3c78bc61 | 889 | for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) { |
49887941 | 890 | struct pci_bus *parent = bus; |
cc57450f RS |
891 | if (pci_find_bus(pci_domain_nr(bus), |
892 | max+i+1)) | |
893 | break; | |
49887941 DB |
894 | while (parent->parent) { |
895 | if ((!pcibios_assign_all_busses()) && | |
b918c62e YL |
896 | (parent->busn_res.end > max) && |
897 | (parent->busn_res.end <= max+i)) { | |
49887941 DB |
898 | j = 1; |
899 | } | |
900 | parent = parent->parent; | |
901 | } | |
902 | if (j) { | |
903 | /* | |
904 | * Often, there are two cardbus bridges | |
905 | * -- try to leave one valid bus number | |
906 | * for each one. | |
907 | */ | |
908 | i /= 2; | |
909 | break; | |
910 | } | |
911 | } | |
cc57450f | 912 | max += i; |
1da177e4 LT |
913 | } |
914 | /* | |
915 | * Set the subordinate bus number to its real value. | |
916 | */ | |
1820ffdc AN |
917 | if (max > bus->busn_res.end) { |
918 | dev_warn(&dev->dev, "max busn %02x is outside %pR\n", | |
919 | max, &bus->busn_res); | |
920 | max = bus->busn_res.end; | |
921 | } | |
bc76b731 | 922 | pci_bus_update_busn_res_end(child, max); |
1da177e4 LT |
923 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); |
924 | } | |
925 | ||
cb3576fa GH |
926 | sprintf(child->name, |
927 | (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), | |
928 | pci_domain_nr(bus), child->number); | |
1da177e4 | 929 | |
d55bef51 | 930 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
49887941 | 931 | while (bus->parent) { |
b918c62e YL |
932 | if ((child->busn_res.end > bus->busn_res.end) || |
933 | (child->number > bus->busn_res.end) || | |
49887941 | 934 | (child->number < bus->number) || |
b918c62e | 935 | (child->busn_res.end < bus->number)) { |
227f0647 | 936 | dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n", |
b918c62e YL |
937 | &child->busn_res, |
938 | (bus->number > child->busn_res.end && | |
939 | bus->busn_res.end < child->number) ? | |
a6f29a98 JP |
940 | "wholly" : "partially", |
941 | bus->self->transparent ? " transparent" : "", | |
865df576 | 942 | dev_name(&bus->dev), |
b918c62e | 943 | &bus->busn_res); |
49887941 DB |
944 | } |
945 | bus = bus->parent; | |
946 | } | |
947 | ||
bbe8f9a3 RB |
948 | out: |
949 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); | |
950 | ||
1da177e4 LT |
951 | return max; |
952 | } | |
b7fe9434 | 953 | EXPORT_SYMBOL(pci_scan_bridge); |
1da177e4 LT |
954 | |
955 | /* | |
956 | * Read interrupt line and base address registers. | |
957 | * The architecture-dependent code can tweak these, of course. | |
958 | */ | |
959 | static void pci_read_irq(struct pci_dev *dev) | |
960 | { | |
961 | unsigned char irq; | |
962 | ||
963 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); | |
ffeff788 | 964 | dev->pin = irq; |
1da177e4 LT |
965 | if (irq) |
966 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); | |
967 | dev->irq = irq; | |
968 | } | |
969 | ||
bb209c82 | 970 | void set_pcie_port_type(struct pci_dev *pdev) |
480b93b7 YZ |
971 | { |
972 | int pos; | |
973 | u16 reg16; | |
974 | ||
975 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
976 | if (!pos) | |
977 | return; | |
0efea000 | 978 | pdev->pcie_cap = pos; |
480b93b7 | 979 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
786e2288 | 980 | pdev->pcie_flags_reg = reg16; |
b03e7495 JM |
981 | pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); |
982 | pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; | |
480b93b7 YZ |
983 | } |
984 | ||
bb209c82 | 985 | void set_pcie_hotplug_bridge(struct pci_dev *pdev) |
28760489 | 986 | { |
28760489 EB |
987 | u32 reg32; |
988 | ||
59875ae4 | 989 | pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); |
28760489 EB |
990 | if (reg32 & PCI_EXP_SLTCAP_HPC) |
991 | pdev->is_hotplug_bridge = 1; | |
992 | } | |
993 | ||
78916b00 AW |
994 | /** |
995 | * pci_ext_cfg_is_aliased - is ext config space just an alias of std config? | |
996 | * @dev: PCI device | |
997 | * | |
998 | * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that | |
999 | * when forwarding a type1 configuration request the bridge must check that | |
1000 | * the extended register address field is zero. The bridge is not permitted | |
1001 | * to forward the transactions and must handle it as an Unsupported Request. | |
1002 | * Some bridges do not follow this rule and simply drop the extended register | |
1003 | * bits, resulting in the standard config space being aliased, every 256 | |
1004 | * bytes across the entire configuration space. Test for this condition by | |
1005 | * comparing the first dword of each potential alias to the vendor/device ID. | |
1006 | * Known offenders: | |
1007 | * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03) | |
1008 | * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40) | |
1009 | */ | |
1010 | static bool pci_ext_cfg_is_aliased(struct pci_dev *dev) | |
1011 | { | |
1012 | #ifdef CONFIG_PCI_QUIRKS | |
1013 | int pos; | |
1014 | u32 header, tmp; | |
1015 | ||
1016 | pci_read_config_dword(dev, PCI_VENDOR_ID, &header); | |
1017 | ||
1018 | for (pos = PCI_CFG_SPACE_SIZE; | |
1019 | pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) { | |
1020 | if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL | |
1021 | || header != tmp) | |
1022 | return false; | |
1023 | } | |
1024 | ||
1025 | return true; | |
1026 | #else | |
1027 | return false; | |
1028 | #endif | |
1029 | } | |
1030 | ||
0b950f0f SH |
1031 | /** |
1032 | * pci_cfg_space_size - get the configuration space size of the PCI device. | |
1033 | * @dev: PCI device | |
1034 | * | |
1035 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices | |
1036 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can | |
1037 | * access it. Maybe we don't have a way to generate extended config space | |
1038 | * accesses, or the device is behind a reverse Express bridge. So we try | |
1039 | * reading the dword at 0x100 which must either be 0 or a valid extended | |
1040 | * capability header. | |
1041 | */ | |
1042 | static int pci_cfg_space_size_ext(struct pci_dev *dev) | |
1043 | { | |
1044 | u32 status; | |
1045 | int pos = PCI_CFG_SPACE_SIZE; | |
1046 | ||
1047 | if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) | |
1048 | goto fail; | |
78916b00 | 1049 | if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev)) |
0b950f0f SH |
1050 | goto fail; |
1051 | ||
1052 | return PCI_CFG_SPACE_EXP_SIZE; | |
1053 | ||
1054 | fail: | |
1055 | return PCI_CFG_SPACE_SIZE; | |
1056 | } | |
1057 | ||
1058 | int pci_cfg_space_size(struct pci_dev *dev) | |
1059 | { | |
1060 | int pos; | |
1061 | u32 status; | |
1062 | u16 class; | |
1063 | ||
1064 | class = dev->class >> 8; | |
1065 | if (class == PCI_CLASS_BRIDGE_HOST) | |
1066 | return pci_cfg_space_size_ext(dev); | |
1067 | ||
1068 | if (!pci_is_pcie(dev)) { | |
1069 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
1070 | if (!pos) | |
1071 | goto fail; | |
1072 | ||
1073 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); | |
1074 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) | |
1075 | goto fail; | |
1076 | } | |
1077 | ||
1078 | return pci_cfg_space_size_ext(dev); | |
1079 | ||
1080 | fail: | |
1081 | return PCI_CFG_SPACE_SIZE; | |
1082 | } | |
1083 | ||
01abc2aa | 1084 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
76e6a1d6 | 1085 | |
1da177e4 LT |
1086 | /** |
1087 | * pci_setup_device - fill in class and map information of a device | |
1088 | * @dev: the device structure to fill | |
1089 | * | |
f7625980 | 1090 | * Initialize the device structure with information about the device's |
1da177e4 LT |
1091 | * vendor,class,memory and IO-space addresses,IRQ lines etc. |
1092 | * Called at initialisation of the PCI subsystem and by CardBus services. | |
480b93b7 YZ |
1093 | * Returns 0 on success and negative if unknown type of device (not normal, |
1094 | * bridge or CardBus). | |
1da177e4 | 1095 | */ |
480b93b7 | 1096 | int pci_setup_device(struct pci_dev *dev) |
1da177e4 LT |
1097 | { |
1098 | u32 class; | |
480b93b7 YZ |
1099 | u8 hdr_type; |
1100 | struct pci_slot *slot; | |
bc577d2b | 1101 | int pos = 0; |
5bfa14ed BH |
1102 | struct pci_bus_region region; |
1103 | struct resource *res; | |
480b93b7 YZ |
1104 | |
1105 | if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) | |
1106 | return -EIO; | |
1107 | ||
1108 | dev->sysdata = dev->bus->sysdata; | |
1109 | dev->dev.parent = dev->bus->bridge; | |
1110 | dev->dev.bus = &pci_bus_type; | |
1111 | dev->hdr_type = hdr_type & 0x7f; | |
1112 | dev->multifunction = !!(hdr_type & 0x80); | |
480b93b7 YZ |
1113 | dev->error_state = pci_channel_io_normal; |
1114 | set_pcie_port_type(dev); | |
1115 | ||
1116 | list_for_each_entry(slot, &dev->bus->slots, list) | |
1117 | if (PCI_SLOT(dev->devfn) == slot->number) | |
1118 | dev->slot = slot; | |
1119 | ||
1120 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) | |
1121 | set this higher, assuming the system even supports it. */ | |
1122 | dev->dma_mask = 0xffffffff; | |
1da177e4 | 1123 | |
eebfcfb5 GKH |
1124 | dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), |
1125 | dev->bus->number, PCI_SLOT(dev->devfn), | |
1126 | PCI_FUNC(dev->devfn)); | |
1da177e4 LT |
1127 | |
1128 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); | |
b8a3a521 | 1129 | dev->revision = class & 0xff; |
2dd8ba92 | 1130 | dev->class = class >> 8; /* upper 3 bytes */ |
1da177e4 | 1131 | |
2dd8ba92 YL |
1132 | dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n", |
1133 | dev->vendor, dev->device, dev->hdr_type, dev->class); | |
1da177e4 | 1134 | |
853346e4 YZ |
1135 | /* need to have dev->class ready */ |
1136 | dev->cfg_size = pci_cfg_space_size(dev); | |
1137 | ||
1da177e4 | 1138 | /* "Unknown power state" */ |
3fe9d19f | 1139 | dev->current_state = PCI_UNKNOWN; |
1da177e4 LT |
1140 | |
1141 | /* Early fixups, before probing the BARs */ | |
1142 | pci_fixup_device(pci_fixup_early, dev); | |
f79b1b14 YZ |
1143 | /* device class may be changed after fixup */ |
1144 | class = dev->class >> 8; | |
1da177e4 LT |
1145 | |
1146 | switch (dev->hdr_type) { /* header type */ | |
1147 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ | |
1148 | if (class == PCI_CLASS_BRIDGE_PCI) | |
1149 | goto bad; | |
1150 | pci_read_irq(dev); | |
1151 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); | |
1152 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1153 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); | |
368c73d4 AC |
1154 | |
1155 | /* | |
075eb9e3 BH |
1156 | * Do the ugly legacy mode stuff here rather than broken chip |
1157 | * quirk code. Legacy mode ATA controllers have fixed | |
1158 | * addresses. These are not always echoed in BAR0-3, and | |
1159 | * BAR0-3 in a few cases contain junk! | |
368c73d4 AC |
1160 | */ |
1161 | if (class == PCI_CLASS_STORAGE_IDE) { | |
1162 | u8 progif; | |
1163 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); | |
1164 | if ((progif & 1) == 0) { | |
5bfa14ed BH |
1165 | region.start = 0x1F0; |
1166 | region.end = 0x1F7; | |
1167 | res = &dev->resource[0]; | |
1168 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1169 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1170 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n", |
1171 | res); | |
5bfa14ed BH |
1172 | region.start = 0x3F6; |
1173 | region.end = 0x3F6; | |
1174 | res = &dev->resource[1]; | |
1175 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1176 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1177 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n", |
1178 | res); | |
368c73d4 AC |
1179 | } |
1180 | if ((progif & 4) == 0) { | |
5bfa14ed BH |
1181 | region.start = 0x170; |
1182 | region.end = 0x177; | |
1183 | res = &dev->resource[2]; | |
1184 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1185 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1186 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n", |
1187 | res); | |
5bfa14ed BH |
1188 | region.start = 0x376; |
1189 | region.end = 0x376; | |
1190 | res = &dev->resource[3]; | |
1191 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1192 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1193 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n", |
1194 | res); | |
368c73d4 AC |
1195 | } |
1196 | } | |
1da177e4 LT |
1197 | break; |
1198 | ||
1199 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ | |
1200 | if (class != PCI_CLASS_BRIDGE_PCI) | |
1201 | goto bad; | |
1202 | /* The PCI-to-PCI bridge spec requires that subtractive | |
1203 | decoding (i.e. transparent) bridge must have programming | |
f7625980 | 1204 | interface code of 0x01. */ |
3efd273b | 1205 | pci_read_irq(dev); |
1da177e4 LT |
1206 | dev->transparent = ((dev->class & 0xff) == 1); |
1207 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); | |
28760489 | 1208 | set_pcie_hotplug_bridge(dev); |
bc577d2b GB |
1209 | pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); |
1210 | if (pos) { | |
1211 | pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); | |
1212 | pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); | |
1213 | } | |
1da177e4 LT |
1214 | break; |
1215 | ||
1216 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ | |
1217 | if (class != PCI_CLASS_BRIDGE_CARDBUS) | |
1218 | goto bad; | |
1219 | pci_read_irq(dev); | |
1220 | pci_read_bases(dev, 1, 0); | |
1221 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1222 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); | |
1223 | break; | |
1224 | ||
1225 | default: /* unknown header */ | |
227f0647 RD |
1226 | dev_err(&dev->dev, "unknown header type %02x, ignoring device\n", |
1227 | dev->hdr_type); | |
480b93b7 | 1228 | return -EIO; |
1da177e4 LT |
1229 | |
1230 | bad: | |
227f0647 RD |
1231 | dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n", |
1232 | dev->class, dev->hdr_type); | |
1da177e4 LT |
1233 | dev->class = PCI_CLASS_NOT_DEFINED; |
1234 | } | |
1235 | ||
1236 | /* We found a fine healthy device, go go go... */ | |
1237 | return 0; | |
1238 | } | |
1239 | ||
589fcc23 BH |
1240 | static struct hpp_type0 pci_default_type0 = { |
1241 | .revision = 1, | |
1242 | .cache_line_size = 8, | |
1243 | .latency_timer = 0x40, | |
1244 | .enable_serr = 0, | |
1245 | .enable_perr = 0, | |
1246 | }; | |
1247 | ||
1248 | static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp) | |
1249 | { | |
1250 | u16 pci_cmd, pci_bctl; | |
1251 | ||
1252 | if (!hpp) { | |
1253 | /* | |
1254 | * Perhaps we *should* use default settings for PCIe, but | |
1255 | * pciehp didn't, so we won't either. | |
1256 | */ | |
1257 | if (pci_is_pcie(dev)) | |
1258 | return; | |
1259 | hpp = &pci_default_type0; | |
1260 | } | |
1261 | ||
1262 | if (hpp->revision > 1) { | |
1263 | dev_warn(&dev->dev, | |
1264 | "PCI settings rev %d not supported; using defaults\n", | |
1265 | hpp->revision); | |
1266 | hpp = &pci_default_type0; | |
1267 | } | |
1268 | ||
1269 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size); | |
1270 | pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer); | |
1271 | pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); | |
1272 | if (hpp->enable_serr) | |
1273 | pci_cmd |= PCI_COMMAND_SERR; | |
1274 | else | |
1275 | pci_cmd &= ~PCI_COMMAND_SERR; | |
1276 | if (hpp->enable_perr) | |
1277 | pci_cmd |= PCI_COMMAND_PARITY; | |
1278 | else | |
1279 | pci_cmd &= ~PCI_COMMAND_PARITY; | |
1280 | pci_write_config_word(dev, PCI_COMMAND, pci_cmd); | |
1281 | ||
1282 | /* Program bridge control value */ | |
1283 | if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { | |
1284 | pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, | |
1285 | hpp->latency_timer); | |
1286 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); | |
1287 | if (hpp->enable_serr) | |
1288 | pci_bctl |= PCI_BRIDGE_CTL_SERR; | |
1289 | else | |
1290 | pci_bctl &= ~PCI_BRIDGE_CTL_SERR; | |
1291 | if (hpp->enable_perr) | |
1292 | pci_bctl |= PCI_BRIDGE_CTL_PARITY; | |
1293 | else | |
1294 | pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; | |
1295 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp) | |
1300 | { | |
1301 | if (hpp) | |
1302 | dev_warn(&dev->dev, "PCI-X settings not supported\n"); | |
1303 | } | |
1304 | ||
1305 | static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp) | |
1306 | { | |
1307 | int pos; | |
1308 | u32 reg32; | |
1309 | ||
1310 | if (!hpp) | |
1311 | return; | |
1312 | ||
1313 | if (hpp->revision > 1) { | |
1314 | dev_warn(&dev->dev, "PCIe settings rev %d not supported\n", | |
1315 | hpp->revision); | |
1316 | return; | |
1317 | } | |
1318 | ||
1319 | /* Initialize Device Control Register */ | |
1320 | pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, | |
1321 | ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or); | |
1322 | ||
1323 | /* Initialize Link Control Register */ | |
1324 | if (dev->subordinate) | |
1325 | pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL, | |
1326 | ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or); | |
1327 | ||
1328 | /* Find Advanced Error Reporting Enhanced Capability */ | |
1329 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); | |
1330 | if (!pos) | |
1331 | return; | |
1332 | ||
1333 | /* Initialize Uncorrectable Error Mask Register */ | |
1334 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32); | |
1335 | reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or; | |
1336 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32); | |
1337 | ||
1338 | /* Initialize Uncorrectable Error Severity Register */ | |
1339 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32); | |
1340 | reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or; | |
1341 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32); | |
1342 | ||
1343 | /* Initialize Correctable Error Mask Register */ | |
1344 | pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32); | |
1345 | reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or; | |
1346 | pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32); | |
1347 | ||
1348 | /* Initialize Advanced Error Capabilities and Control Register */ | |
1349 | pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32); | |
1350 | reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or; | |
1351 | pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32); | |
1352 | ||
1353 | /* | |
1354 | * FIXME: The following two registers are not supported yet. | |
1355 | * | |
1356 | * o Secondary Uncorrectable Error Severity Register | |
1357 | * o Secondary Uncorrectable Error Mask Register | |
1358 | */ | |
1359 | } | |
1360 | ||
1361 | void pci_configure_slot(struct pci_dev *dev) | |
1362 | { | |
1363 | struct pci_dev *cdev; | |
1364 | struct hotplug_params hpp; | |
1365 | int ret; | |
1366 | ||
1367 | if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || | |
1368 | (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && | |
1369 | (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) | |
1370 | return; | |
1371 | ||
1372 | pcie_bus_configure_settings(dev->bus); | |
1373 | ||
1374 | memset(&hpp, 0, sizeof(hpp)); | |
1375 | ret = pci_get_hp_params(dev, &hpp); | |
1376 | ||
1377 | program_hpp_type2(dev, hpp.t2); | |
1378 | program_hpp_type1(dev, hpp.t1); | |
1379 | program_hpp_type0(dev, hpp.t0); | |
1380 | ||
1381 | if (dev->subordinate) { | |
1382 | list_for_each_entry(cdev, &dev->subordinate->devices, | |
1383 | bus_list) | |
1384 | pci_configure_slot(cdev); | |
1385 | } | |
1386 | } | |
1387 | EXPORT_SYMBOL_GPL(pci_configure_slot); | |
1388 | ||
201de56e ZY |
1389 | static void pci_release_capabilities(struct pci_dev *dev) |
1390 | { | |
1391 | pci_vpd_release(dev); | |
d1b054da | 1392 | pci_iov_release(dev); |
f796841e | 1393 | pci_free_cap_save_buffers(dev); |
201de56e ZY |
1394 | } |
1395 | ||
1da177e4 LT |
1396 | /** |
1397 | * pci_release_dev - free a pci device structure when all users of it are finished. | |
1398 | * @dev: device that's been disconnected | |
1399 | * | |
1400 | * Will be called only by the device core when all users of this pci device are | |
1401 | * done. | |
1402 | */ | |
1403 | static void pci_release_dev(struct device *dev) | |
1404 | { | |
04480094 | 1405 | struct pci_dev *pci_dev; |
1da177e4 | 1406 | |
04480094 | 1407 | pci_dev = to_pci_dev(dev); |
201de56e | 1408 | pci_release_capabilities(pci_dev); |
98d9f30c | 1409 | pci_release_of_node(pci_dev); |
6ae32c53 | 1410 | pcibios_release_device(pci_dev); |
8b1fce04 | 1411 | pci_bus_put(pci_dev->bus); |
782a985d | 1412 | kfree(pci_dev->driver_override); |
1da177e4 LT |
1413 | kfree(pci_dev); |
1414 | } | |
1415 | ||
3c6e6ae7 | 1416 | struct pci_dev *pci_alloc_dev(struct pci_bus *bus) |
65891215 ME |
1417 | { |
1418 | struct pci_dev *dev; | |
1419 | ||
1420 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); | |
1421 | if (!dev) | |
1422 | return NULL; | |
1423 | ||
65891215 | 1424 | INIT_LIST_HEAD(&dev->bus_list); |
88e7b167 | 1425 | dev->dev.type = &pci_dev_type; |
3c6e6ae7 | 1426 | dev->bus = pci_bus_get(bus); |
65891215 ME |
1427 | |
1428 | return dev; | |
1429 | } | |
3c6e6ae7 GZ |
1430 | EXPORT_SYMBOL(pci_alloc_dev); |
1431 | ||
efdc87da | 1432 | bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, |
3c78bc61 | 1433 | int crs_timeout) |
1da177e4 | 1434 | { |
1da177e4 LT |
1435 | int delay = 1; |
1436 | ||
efdc87da YL |
1437 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
1438 | return false; | |
1da177e4 LT |
1439 | |
1440 | /* some broken boards return 0 or ~0 if a slot is empty: */ | |
efdc87da YL |
1441 | if (*l == 0xffffffff || *l == 0x00000000 || |
1442 | *l == 0x0000ffff || *l == 0xffff0000) | |
1443 | return false; | |
1da177e4 LT |
1444 | |
1445 | /* Configuration request Retry Status */ | |
efdc87da YL |
1446 | while (*l == 0xffff0001) { |
1447 | if (!crs_timeout) | |
1448 | return false; | |
1449 | ||
1da177e4 LT |
1450 | msleep(delay); |
1451 | delay *= 2; | |
efdc87da YL |
1452 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
1453 | return false; | |
1da177e4 | 1454 | /* Card hasn't responded in 60 seconds? Must be stuck. */ |
efdc87da | 1455 | if (delay > crs_timeout) { |
227f0647 RD |
1456 | printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n", |
1457 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), | |
1458 | PCI_FUNC(devfn)); | |
efdc87da | 1459 | return false; |
1da177e4 LT |
1460 | } |
1461 | } | |
1462 | ||
efdc87da YL |
1463 | return true; |
1464 | } | |
1465 | EXPORT_SYMBOL(pci_bus_read_dev_vendor_id); | |
1466 | ||
1467 | /* | |
1468 | * Read the config data for a PCI device, sanity-check it | |
1469 | * and fill in the dev structure... | |
1470 | */ | |
1471 | static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) | |
1472 | { | |
1473 | struct pci_dev *dev; | |
1474 | u32 l; | |
1475 | ||
1476 | if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000)) | |
1477 | return NULL; | |
1478 | ||
8b1fce04 | 1479 | dev = pci_alloc_dev(bus); |
1da177e4 LT |
1480 | if (!dev) |
1481 | return NULL; | |
1482 | ||
1da177e4 | 1483 | dev->devfn = devfn; |
1da177e4 LT |
1484 | dev->vendor = l & 0xffff; |
1485 | dev->device = (l >> 16) & 0xffff; | |
cef354db | 1486 | |
98d9f30c BH |
1487 | pci_set_of_node(dev); |
1488 | ||
480b93b7 | 1489 | if (pci_setup_device(dev)) { |
8b1fce04 | 1490 | pci_bus_put(dev->bus); |
1da177e4 LT |
1491 | kfree(dev); |
1492 | return NULL; | |
1493 | } | |
1da177e4 LT |
1494 | |
1495 | return dev; | |
1496 | } | |
1497 | ||
201de56e ZY |
1498 | static void pci_init_capabilities(struct pci_dev *dev) |
1499 | { | |
1500 | /* MSI/MSI-X list */ | |
1501 | pci_msi_init_pci_dev(dev); | |
1502 | ||
63f4898a RW |
1503 | /* Buffers for saving PCIe and PCI-X capabilities */ |
1504 | pci_allocate_cap_save_buffers(dev); | |
1505 | ||
201de56e ZY |
1506 | /* Power Management */ |
1507 | pci_pm_init(dev); | |
1508 | ||
1509 | /* Vital Product Data */ | |
1510 | pci_vpd_pci22_init(dev); | |
58c3a727 YZ |
1511 | |
1512 | /* Alternative Routing-ID Forwarding */ | |
31ab2476 | 1513 | pci_configure_ari(dev); |
d1b054da YZ |
1514 | |
1515 | /* Single Root I/O Virtualization */ | |
1516 | pci_iov_init(dev); | |
ae21ee65 AK |
1517 | |
1518 | /* Enable ACS P2P upstream forwarding */ | |
5d990b62 | 1519 | pci_enable_acs(dev); |
201de56e ZY |
1520 | } |
1521 | ||
96bde06a | 1522 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
1da177e4 | 1523 | { |
4f535093 YL |
1524 | int ret; |
1525 | ||
cdb9b9f7 PM |
1526 | device_initialize(&dev->dev); |
1527 | dev->dev.release = pci_release_dev; | |
1da177e4 | 1528 | |
7629d19a | 1529 | set_dev_node(&dev->dev, pcibus_to_node(bus)); |
cdb9b9f7 | 1530 | dev->dev.dma_mask = &dev->dma_mask; |
4d57cdfa | 1531 | dev->dev.dma_parms = &dev->dma_parms; |
cdb9b9f7 | 1532 | dev->dev.coherent_dma_mask = 0xffffffffull; |
1da177e4 | 1533 | |
4d57cdfa | 1534 | pci_set_dma_max_seg_size(dev, 65536); |
59fc67de | 1535 | pci_set_dma_seg_boundary(dev, 0xffffffff); |
4d57cdfa | 1536 | |
1da177e4 LT |
1537 | /* Fix up broken headers */ |
1538 | pci_fixup_device(pci_fixup_header, dev); | |
1539 | ||
2069ecfb YL |
1540 | /* moved out from quirk header fixup code */ |
1541 | pci_reassigndev_resource_alignment(dev); | |
1542 | ||
4b77b0a2 RW |
1543 | /* Clear the state_saved flag. */ |
1544 | dev->state_saved = false; | |
1545 | ||
201de56e ZY |
1546 | /* Initialize various capabilities */ |
1547 | pci_init_capabilities(dev); | |
eb9d0fe4 | 1548 | |
1da177e4 LT |
1549 | /* |
1550 | * Add the device to our list of discovered devices | |
1551 | * and the bus list for fixup functions, etc. | |
1552 | */ | |
d71374da | 1553 | down_write(&pci_bus_sem); |
1da177e4 | 1554 | list_add_tail(&dev->bus_list, &bus->devices); |
d71374da | 1555 | up_write(&pci_bus_sem); |
4f535093 | 1556 | |
4f535093 YL |
1557 | ret = pcibios_add_device(dev); |
1558 | WARN_ON(ret < 0); | |
1559 | ||
1560 | /* Notifier could use PCI capabilities */ | |
1561 | dev->match_driver = false; | |
1562 | ret = device_add(&dev->dev); | |
1563 | WARN_ON(ret < 0); | |
cdb9b9f7 PM |
1564 | } |
1565 | ||
10874f5a | 1566 | struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn) |
cdb9b9f7 PM |
1567 | { |
1568 | struct pci_dev *dev; | |
1569 | ||
90bdb311 TP |
1570 | dev = pci_get_slot(bus, devfn); |
1571 | if (dev) { | |
1572 | pci_dev_put(dev); | |
1573 | return dev; | |
1574 | } | |
1575 | ||
cdb9b9f7 PM |
1576 | dev = pci_scan_device(bus, devfn); |
1577 | if (!dev) | |
1578 | return NULL; | |
1579 | ||
1580 | pci_device_add(dev, bus); | |
1da177e4 LT |
1581 | |
1582 | return dev; | |
1583 | } | |
b73e9687 | 1584 | EXPORT_SYMBOL(pci_scan_single_device); |
1da177e4 | 1585 | |
b1bd58e4 | 1586 | static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn) |
f07852d6 | 1587 | { |
b1bd58e4 YW |
1588 | int pos; |
1589 | u16 cap = 0; | |
1590 | unsigned next_fn; | |
4fb88c1a | 1591 | |
b1bd58e4 YW |
1592 | if (pci_ari_enabled(bus)) { |
1593 | if (!dev) | |
1594 | return 0; | |
1595 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); | |
1596 | if (!pos) | |
1597 | return 0; | |
4fb88c1a | 1598 | |
b1bd58e4 YW |
1599 | pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap); |
1600 | next_fn = PCI_ARI_CAP_NFN(cap); | |
1601 | if (next_fn <= fn) | |
1602 | return 0; /* protect against malformed list */ | |
f07852d6 | 1603 | |
b1bd58e4 YW |
1604 | return next_fn; |
1605 | } | |
1606 | ||
1607 | /* dev may be NULL for non-contiguous multifunction devices */ | |
1608 | if (!dev || dev->multifunction) | |
1609 | return (fn + 1) % 8; | |
f07852d6 | 1610 | |
f07852d6 MW |
1611 | return 0; |
1612 | } | |
1613 | ||
1614 | static int only_one_child(struct pci_bus *bus) | |
1615 | { | |
1616 | struct pci_dev *parent = bus->self; | |
284f5f9d | 1617 | |
f07852d6 MW |
1618 | if (!parent || !pci_is_pcie(parent)) |
1619 | return 0; | |
62f87c0e | 1620 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT) |
284f5f9d | 1621 | return 1; |
62f87c0e | 1622 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM && |
284f5f9d | 1623 | !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS)) |
f07852d6 MW |
1624 | return 1; |
1625 | return 0; | |
1626 | } | |
1627 | ||
1da177e4 LT |
1628 | /** |
1629 | * pci_scan_slot - scan a PCI slot on a bus for devices. | |
1630 | * @bus: PCI bus to scan | |
1631 | * @devfn: slot number to scan (must have zero function.) | |
1632 | * | |
1633 | * Scan a PCI slot on the specified PCI bus for devices, adding | |
1634 | * discovered devices to the @bus->devices list. New devices | |
8a1bc901 | 1635 | * will not have is_added set. |
1b69dfc6 TP |
1636 | * |
1637 | * Returns the number of new devices found. | |
1da177e4 | 1638 | */ |
96bde06a | 1639 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
1da177e4 | 1640 | { |
f07852d6 | 1641 | unsigned fn, nr = 0; |
1b69dfc6 | 1642 | struct pci_dev *dev; |
f07852d6 MW |
1643 | |
1644 | if (only_one_child(bus) && (devfn > 0)) | |
1645 | return 0; /* Already scanned the entire slot */ | |
1da177e4 | 1646 | |
1b69dfc6 | 1647 | dev = pci_scan_single_device(bus, devfn); |
4fb88c1a MW |
1648 | if (!dev) |
1649 | return 0; | |
1650 | if (!dev->is_added) | |
1b69dfc6 TP |
1651 | nr++; |
1652 | ||
b1bd58e4 | 1653 | for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) { |
f07852d6 MW |
1654 | dev = pci_scan_single_device(bus, devfn + fn); |
1655 | if (dev) { | |
1656 | if (!dev->is_added) | |
1657 | nr++; | |
1658 | dev->multifunction = 1; | |
1da177e4 LT |
1659 | } |
1660 | } | |
7d715a6c | 1661 | |
149e1637 SL |
1662 | /* only one slot has pcie device */ |
1663 | if (bus->self && nr) | |
7d715a6c SL |
1664 | pcie_aspm_init_link_state(bus->self); |
1665 | ||
1da177e4 LT |
1666 | return nr; |
1667 | } | |
b7fe9434 | 1668 | EXPORT_SYMBOL(pci_scan_slot); |
1da177e4 | 1669 | |
b03e7495 JM |
1670 | static int pcie_find_smpss(struct pci_dev *dev, void *data) |
1671 | { | |
1672 | u8 *smpss = data; | |
1673 | ||
1674 | if (!pci_is_pcie(dev)) | |
1675 | return 0; | |
1676 | ||
d4aa68f6 YW |
1677 | /* |
1678 | * We don't have a way to change MPS settings on devices that have | |
1679 | * drivers attached. A hot-added device might support only the minimum | |
1680 | * MPS setting (MPS=128). Therefore, if the fabric contains a bridge | |
1681 | * where devices may be hot-added, we limit the fabric MPS to 128 so | |
1682 | * hot-added devices will work correctly. | |
1683 | * | |
1684 | * However, if we hot-add a device to a slot directly below a Root | |
1685 | * Port, it's impossible for there to be other existing devices below | |
1686 | * the port. We don't limit the MPS in this case because we can | |
1687 | * reconfigure MPS on both the Root Port and the hot-added device, | |
1688 | * and there are no other devices involved. | |
1689 | * | |
1690 | * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA. | |
b03e7495 | 1691 | */ |
d4aa68f6 YW |
1692 | if (dev->is_hotplug_bridge && |
1693 | pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) | |
b03e7495 JM |
1694 | *smpss = 0; |
1695 | ||
1696 | if (*smpss > dev->pcie_mpss) | |
1697 | *smpss = dev->pcie_mpss; | |
1698 | ||
1699 | return 0; | |
1700 | } | |
1701 | ||
1702 | static void pcie_write_mps(struct pci_dev *dev, int mps) | |
1703 | { | |
62f392ea | 1704 | int rc; |
b03e7495 JM |
1705 | |
1706 | if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { | |
62f392ea | 1707 | mps = 128 << dev->pcie_mpss; |
b03e7495 | 1708 | |
62f87c0e YW |
1709 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT && |
1710 | dev->bus->self) | |
62f392ea | 1711 | /* For "Performance", the assumption is made that |
b03e7495 JM |
1712 | * downstream communication will never be larger than |
1713 | * the MRRS. So, the MPS only needs to be configured | |
1714 | * for the upstream communication. This being the case, | |
1715 | * walk from the top down and set the MPS of the child | |
1716 | * to that of the parent bus. | |
62f392ea JM |
1717 | * |
1718 | * Configure the device MPS with the smaller of the | |
1719 | * device MPSS or the bridge MPS (which is assumed to be | |
1720 | * properly configured at this point to the largest | |
1721 | * allowable MPS based on its parent bus). | |
b03e7495 | 1722 | */ |
62f392ea | 1723 | mps = min(mps, pcie_get_mps(dev->bus->self)); |
b03e7495 JM |
1724 | } |
1725 | ||
1726 | rc = pcie_set_mps(dev, mps); | |
1727 | if (rc) | |
1728 | dev_err(&dev->dev, "Failed attempting to set the MPS\n"); | |
1729 | } | |
1730 | ||
62f392ea | 1731 | static void pcie_write_mrrs(struct pci_dev *dev) |
b03e7495 | 1732 | { |
62f392ea | 1733 | int rc, mrrs; |
b03e7495 | 1734 | |
ed2888e9 JM |
1735 | /* In the "safe" case, do not configure the MRRS. There appear to be |
1736 | * issues with setting MRRS to 0 on a number of devices. | |
1737 | */ | |
ed2888e9 JM |
1738 | if (pcie_bus_config != PCIE_BUS_PERFORMANCE) |
1739 | return; | |
1740 | ||
ed2888e9 JM |
1741 | /* For Max performance, the MRRS must be set to the largest supported |
1742 | * value. However, it cannot be configured larger than the MPS the | |
62f392ea JM |
1743 | * device or the bus can support. This should already be properly |
1744 | * configured by a prior call to pcie_write_mps. | |
ed2888e9 | 1745 | */ |
62f392ea | 1746 | mrrs = pcie_get_mps(dev); |
b03e7495 JM |
1747 | |
1748 | /* MRRS is a R/W register. Invalid values can be written, but a | |
ed2888e9 | 1749 | * subsequent read will verify if the value is acceptable or not. |
b03e7495 JM |
1750 | * If the MRRS value provided is not acceptable (e.g., too large), |
1751 | * shrink the value until it is acceptable to the HW. | |
f7625980 | 1752 | */ |
b03e7495 JM |
1753 | while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) { |
1754 | rc = pcie_set_readrq(dev, mrrs); | |
62f392ea JM |
1755 | if (!rc) |
1756 | break; | |
b03e7495 | 1757 | |
62f392ea | 1758 | dev_warn(&dev->dev, "Failed attempting to set the MRRS\n"); |
b03e7495 JM |
1759 | mrrs /= 2; |
1760 | } | |
62f392ea JM |
1761 | |
1762 | if (mrrs < 128) | |
227f0647 | 1763 | 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 |
1764 | } |
1765 | ||
5895af79 YW |
1766 | static void pcie_bus_detect_mps(struct pci_dev *dev) |
1767 | { | |
1768 | struct pci_dev *bridge = dev->bus->self; | |
1769 | int mps, p_mps; | |
1770 | ||
1771 | if (!bridge) | |
1772 | return; | |
1773 | ||
1774 | mps = pcie_get_mps(dev); | |
1775 | p_mps = pcie_get_mps(bridge); | |
1776 | ||
1777 | if (mps != p_mps) | |
1778 | 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", | |
1779 | mps, pci_name(bridge), p_mps); | |
1780 | } | |
1781 | ||
b03e7495 JM |
1782 | static int pcie_bus_configure_set(struct pci_dev *dev, void *data) |
1783 | { | |
a513a99a | 1784 | int mps, orig_mps; |
b03e7495 JM |
1785 | |
1786 | if (!pci_is_pcie(dev)) | |
1787 | return 0; | |
1788 | ||
5895af79 YW |
1789 | if (pcie_bus_config == PCIE_BUS_TUNE_OFF) { |
1790 | pcie_bus_detect_mps(dev); | |
1791 | return 0; | |
1792 | } | |
1793 | ||
a513a99a JM |
1794 | mps = 128 << *(u8 *)data; |
1795 | orig_mps = pcie_get_mps(dev); | |
b03e7495 JM |
1796 | |
1797 | pcie_write_mps(dev, mps); | |
62f392ea | 1798 | pcie_write_mrrs(dev); |
b03e7495 | 1799 | |
227f0647 RD |
1800 | dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n", |
1801 | pcie_get_mps(dev), 128 << dev->pcie_mpss, | |
a513a99a | 1802 | orig_mps, pcie_get_readrq(dev)); |
b03e7495 JM |
1803 | |
1804 | return 0; | |
1805 | } | |
1806 | ||
a513a99a | 1807 | /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down, |
b03e7495 JM |
1808 | * parents then children fashion. If this changes, then this code will not |
1809 | * work as designed. | |
1810 | */ | |
a58674ff | 1811 | void pcie_bus_configure_settings(struct pci_bus *bus) |
b03e7495 | 1812 | { |
1e358f94 | 1813 | u8 smpss = 0; |
b03e7495 | 1814 | |
a58674ff | 1815 | if (!bus->self) |
b03e7495 JM |
1816 | return; |
1817 | ||
b03e7495 | 1818 | if (!pci_is_pcie(bus->self)) |
5f39e670 JM |
1819 | return; |
1820 | ||
1821 | /* FIXME - Peer to peer DMA is possible, though the endpoint would need | |
3315472c | 1822 | * to be aware of the MPS of the destination. To work around this, |
5f39e670 JM |
1823 | * simply force the MPS of the entire system to the smallest possible. |
1824 | */ | |
1825 | if (pcie_bus_config == PCIE_BUS_PEER2PEER) | |
1826 | smpss = 0; | |
1827 | ||
b03e7495 | 1828 | if (pcie_bus_config == PCIE_BUS_SAFE) { |
a58674ff | 1829 | smpss = bus->self->pcie_mpss; |
5f39e670 | 1830 | |
b03e7495 JM |
1831 | pcie_find_smpss(bus->self, &smpss); |
1832 | pci_walk_bus(bus, pcie_find_smpss, &smpss); | |
1833 | } | |
1834 | ||
1835 | pcie_bus_configure_set(bus->self, &smpss); | |
1836 | pci_walk_bus(bus, pcie_bus_configure_set, &smpss); | |
1837 | } | |
debc3b77 | 1838 | EXPORT_SYMBOL_GPL(pcie_bus_configure_settings); |
b03e7495 | 1839 | |
15856ad5 | 1840 | unsigned int pci_scan_child_bus(struct pci_bus *bus) |
1da177e4 | 1841 | { |
b918c62e | 1842 | unsigned int devfn, pass, max = bus->busn_res.start; |
1da177e4 LT |
1843 | struct pci_dev *dev; |
1844 | ||
0207c356 | 1845 | dev_dbg(&bus->dev, "scanning bus\n"); |
1da177e4 LT |
1846 | |
1847 | /* Go find them, Rover! */ | |
1848 | for (devfn = 0; devfn < 0x100; devfn += 8) | |
1849 | pci_scan_slot(bus, devfn); | |
1850 | ||
a28724b0 YZ |
1851 | /* Reserve buses for SR-IOV capability. */ |
1852 | max += pci_iov_bus_range(bus); | |
1853 | ||
1da177e4 LT |
1854 | /* |
1855 | * After performing arch-dependent fixup of the bus, look behind | |
1856 | * all PCI-to-PCI bridges on this bus. | |
1857 | */ | |
74710ded | 1858 | if (!bus->is_added) { |
0207c356 | 1859 | dev_dbg(&bus->dev, "fixups for bus\n"); |
74710ded | 1860 | pcibios_fixup_bus(bus); |
981cf9ea | 1861 | bus->is_added = 1; |
74710ded AC |
1862 | } |
1863 | ||
3c78bc61 | 1864 | for (pass = 0; pass < 2; pass++) |
1da177e4 | 1865 | list_for_each_entry(dev, &bus->devices, bus_list) { |
6788a51f | 1866 | if (pci_is_bridge(dev)) |
1da177e4 LT |
1867 | max = pci_scan_bridge(bus, dev, max, pass); |
1868 | } | |
1869 | ||
1870 | /* | |
1871 | * We've scanned the bus and so we know all about what's on | |
1872 | * the other side of any bridges that may be on this bus plus | |
1873 | * any devices. | |
1874 | * | |
1875 | * Return how far we've got finding sub-buses. | |
1876 | */ | |
0207c356 | 1877 | dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); |
1da177e4 LT |
1878 | return max; |
1879 | } | |
b7fe9434 | 1880 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
1da177e4 | 1881 | |
6c0cc950 RW |
1882 | /** |
1883 | * pcibios_root_bridge_prepare - Platform-specific host bridge setup. | |
1884 | * @bridge: Host bridge to set up. | |
1885 | * | |
1886 | * Default empty implementation. Replace with an architecture-specific setup | |
1887 | * routine, if necessary. | |
1888 | */ | |
1889 | int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) | |
1890 | { | |
1891 | return 0; | |
1892 | } | |
1893 | ||
10a95747 JL |
1894 | void __weak pcibios_add_bus(struct pci_bus *bus) |
1895 | { | |
1896 | } | |
1897 | ||
1898 | void __weak pcibios_remove_bus(struct pci_bus *bus) | |
1899 | { | |
1900 | } | |
1901 | ||
166c6370 BH |
1902 | struct pci_bus *pci_create_root_bus(struct device *parent, int bus, |
1903 | struct pci_ops *ops, void *sysdata, struct list_head *resources) | |
1da177e4 | 1904 | { |
0efd5aab | 1905 | int error; |
5a21d70d | 1906 | struct pci_host_bridge *bridge; |
0207c356 | 1907 | struct pci_bus *b, *b2; |
0efd5aab | 1908 | struct pci_host_bridge_window *window, *n; |
a9d9f527 | 1909 | struct resource *res; |
0efd5aab BH |
1910 | resource_size_t offset; |
1911 | char bus_addr[64]; | |
1912 | char *fmt; | |
1da177e4 LT |
1913 | |
1914 | b = pci_alloc_bus(); | |
1915 | if (!b) | |
7b543663 | 1916 | return NULL; |
1da177e4 LT |
1917 | |
1918 | b->sysdata = sysdata; | |
1919 | b->ops = ops; | |
4f535093 | 1920 | b->number = b->busn_res.start = bus; |
0207c356 BH |
1921 | b2 = pci_find_bus(pci_domain_nr(b), bus); |
1922 | if (b2) { | |
1da177e4 | 1923 | /* If we already got to this bus through a different bridge, ignore it */ |
0207c356 | 1924 | dev_dbg(&b2->dev, "bus already known\n"); |
1da177e4 LT |
1925 | goto err_out; |
1926 | } | |
d71374da | 1927 | |
7b543663 YL |
1928 | bridge = pci_alloc_host_bridge(b); |
1929 | if (!bridge) | |
1930 | goto err_out; | |
1931 | ||
1932 | bridge->dev.parent = parent; | |
70efde2a | 1933 | bridge->dev.release = pci_release_host_bridge_dev; |
7b543663 | 1934 | dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); |
6c0cc950 | 1935 | error = pcibios_root_bridge_prepare(bridge); |
343df771 JL |
1936 | if (error) { |
1937 | kfree(bridge); | |
1938 | goto err_out; | |
1939 | } | |
6c0cc950 | 1940 | |
7b543663 | 1941 | error = device_register(&bridge->dev); |
343df771 JL |
1942 | if (error) { |
1943 | put_device(&bridge->dev); | |
1944 | goto err_out; | |
1945 | } | |
7b543663 | 1946 | b->bridge = get_device(&bridge->dev); |
a1e4d72c | 1947 | device_enable_async_suspend(b->bridge); |
98d9f30c | 1948 | pci_set_bus_of_node(b); |
1da177e4 | 1949 | |
0d358f22 YL |
1950 | if (!parent) |
1951 | set_dev_node(b->bridge, pcibus_to_node(b)); | |
1952 | ||
fd7d1ced GKH |
1953 | b->dev.class = &pcibus_class; |
1954 | b->dev.parent = b->bridge; | |
1a927133 | 1955 | dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); |
fd7d1ced | 1956 | error = device_register(&b->dev); |
1da177e4 LT |
1957 | if (error) |
1958 | goto class_dev_reg_err; | |
1da177e4 | 1959 | |
10a95747 JL |
1960 | pcibios_add_bus(b); |
1961 | ||
1da177e4 LT |
1962 | /* Create legacy_io and legacy_mem files for this bus */ |
1963 | pci_create_legacy_files(b); | |
1964 | ||
a9d9f527 BH |
1965 | if (parent) |
1966 | dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); | |
1967 | else | |
1968 | printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); | |
1969 | ||
0efd5aab BH |
1970 | /* Add initial resources to the bus */ |
1971 | list_for_each_entry_safe(window, n, resources, list) { | |
1972 | list_move_tail(&window->list, &bridge->windows); | |
1973 | res = window->res; | |
1974 | offset = window->offset; | |
f848ffb1 YL |
1975 | if (res->flags & IORESOURCE_BUS) |
1976 | pci_bus_insert_busn_res(b, bus, res->end); | |
1977 | else | |
1978 | pci_bus_add_resource(b, res, 0); | |
0efd5aab BH |
1979 | if (offset) { |
1980 | if (resource_type(res) == IORESOURCE_IO) | |
1981 | fmt = " (bus address [%#06llx-%#06llx])"; | |
1982 | else | |
1983 | fmt = " (bus address [%#010llx-%#010llx])"; | |
1984 | snprintf(bus_addr, sizeof(bus_addr), fmt, | |
1985 | (unsigned long long) (res->start - offset), | |
1986 | (unsigned long long) (res->end - offset)); | |
1987 | } else | |
1988 | bus_addr[0] = '\0'; | |
1989 | dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr); | |
a9d9f527 BH |
1990 | } |
1991 | ||
a5390aa6 BH |
1992 | down_write(&pci_bus_sem); |
1993 | list_add_tail(&b->node, &pci_root_buses); | |
1994 | up_write(&pci_bus_sem); | |
1995 | ||
1da177e4 LT |
1996 | return b; |
1997 | ||
1da177e4 | 1998 | class_dev_reg_err: |
7b543663 YL |
1999 | put_device(&bridge->dev); |
2000 | device_unregister(&bridge->dev); | |
1da177e4 | 2001 | err_out: |
1da177e4 LT |
2002 | kfree(b); |
2003 | return NULL; | |
2004 | } | |
cdb9b9f7 | 2005 | |
98a35831 YL |
2006 | int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) |
2007 | { | |
2008 | struct resource *res = &b->busn_res; | |
2009 | struct resource *parent_res, *conflict; | |
2010 | ||
2011 | res->start = bus; | |
2012 | res->end = bus_max; | |
2013 | res->flags = IORESOURCE_BUS; | |
2014 | ||
2015 | if (!pci_is_root_bus(b)) | |
2016 | parent_res = &b->parent->busn_res; | |
2017 | else { | |
2018 | parent_res = get_pci_domain_busn_res(pci_domain_nr(b)); | |
2019 | res->flags |= IORESOURCE_PCI_FIXED; | |
2020 | } | |
2021 | ||
ced04d15 | 2022 | conflict = request_resource_conflict(parent_res, res); |
98a35831 YL |
2023 | |
2024 | if (conflict) | |
2025 | dev_printk(KERN_DEBUG, &b->dev, | |
2026 | "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n", | |
2027 | res, pci_is_root_bus(b) ? "domain " : "", | |
2028 | parent_res, conflict->name, conflict); | |
98a35831 YL |
2029 | |
2030 | return conflict == NULL; | |
2031 | } | |
2032 | ||
2033 | int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max) | |
2034 | { | |
2035 | struct resource *res = &b->busn_res; | |
2036 | struct resource old_res = *res; | |
2037 | resource_size_t size; | |
2038 | int ret; | |
2039 | ||
2040 | if (res->start > bus_max) | |
2041 | return -EINVAL; | |
2042 | ||
2043 | size = bus_max - res->start + 1; | |
2044 | ret = adjust_resource(res, res->start, size); | |
2045 | dev_printk(KERN_DEBUG, &b->dev, | |
2046 | "busn_res: %pR end %s updated to %02x\n", | |
2047 | &old_res, ret ? "can not be" : "is", bus_max); | |
2048 | ||
2049 | if (!ret && !res->parent) | |
2050 | pci_bus_insert_busn_res(b, res->start, res->end); | |
2051 | ||
2052 | return ret; | |
2053 | } | |
2054 | ||
2055 | void pci_bus_release_busn_res(struct pci_bus *b) | |
2056 | { | |
2057 | struct resource *res = &b->busn_res; | |
2058 | int ret; | |
2059 | ||
2060 | if (!res->flags || !res->parent) | |
2061 | return; | |
2062 | ||
2063 | ret = release_resource(res); | |
2064 | dev_printk(KERN_DEBUG, &b->dev, | |
2065 | "busn_res: %pR %s released\n", | |
2066 | res, ret ? "can not be" : "is"); | |
2067 | } | |
2068 | ||
15856ad5 | 2069 | struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, |
a2ebb827 BH |
2070 | struct pci_ops *ops, void *sysdata, struct list_head *resources) |
2071 | { | |
4d99f524 YL |
2072 | struct pci_host_bridge_window *window; |
2073 | bool found = false; | |
a2ebb827 | 2074 | struct pci_bus *b; |
4d99f524 YL |
2075 | int max; |
2076 | ||
2077 | list_for_each_entry(window, resources, list) | |
2078 | if (window->res->flags & IORESOURCE_BUS) { | |
2079 | found = true; | |
2080 | break; | |
2081 | } | |
a2ebb827 BH |
2082 | |
2083 | b = pci_create_root_bus(parent, bus, ops, sysdata, resources); | |
2084 | if (!b) | |
2085 | return NULL; | |
2086 | ||
4d99f524 YL |
2087 | if (!found) { |
2088 | dev_info(&b->dev, | |
2089 | "No busn resource found for root bus, will use [bus %02x-ff]\n", | |
2090 | bus); | |
2091 | pci_bus_insert_busn_res(b, bus, 255); | |
2092 | } | |
2093 | ||
2094 | max = pci_scan_child_bus(b); | |
2095 | ||
2096 | if (!found) | |
2097 | pci_bus_update_busn_res_end(b, max); | |
2098 | ||
a2ebb827 BH |
2099 | pci_bus_add_devices(b); |
2100 | return b; | |
2101 | } | |
2102 | EXPORT_SYMBOL(pci_scan_root_bus); | |
2103 | ||
7e00fe2e | 2104 | /* Deprecated; use pci_scan_root_bus() instead */ |
15856ad5 | 2105 | struct pci_bus *pci_scan_bus_parented(struct device *parent, |
cdb9b9f7 PM |
2106 | int bus, struct pci_ops *ops, void *sysdata) |
2107 | { | |
1e39ae9f | 2108 | LIST_HEAD(resources); |
cdb9b9f7 PM |
2109 | struct pci_bus *b; |
2110 | ||
1e39ae9f BH |
2111 | pci_add_resource(&resources, &ioport_resource); |
2112 | pci_add_resource(&resources, &iomem_resource); | |
857c3b66 | 2113 | pci_add_resource(&resources, &busn_resource); |
1e39ae9f | 2114 | b = pci_create_root_bus(parent, bus, ops, sysdata, &resources); |
cdb9b9f7 | 2115 | if (b) |
857c3b66 | 2116 | pci_scan_child_bus(b); |
1e39ae9f BH |
2117 | else |
2118 | pci_free_resource_list(&resources); | |
cdb9b9f7 PM |
2119 | return b; |
2120 | } | |
1da177e4 LT |
2121 | EXPORT_SYMBOL(pci_scan_bus_parented); |
2122 | ||
15856ad5 | 2123 | struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, |
de4b2f76 BH |
2124 | void *sysdata) |
2125 | { | |
2126 | LIST_HEAD(resources); | |
2127 | struct pci_bus *b; | |
2128 | ||
2129 | pci_add_resource(&resources, &ioport_resource); | |
2130 | pci_add_resource(&resources, &iomem_resource); | |
857c3b66 | 2131 | pci_add_resource(&resources, &busn_resource); |
de4b2f76 BH |
2132 | b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources); |
2133 | if (b) { | |
857c3b66 | 2134 | pci_scan_child_bus(b); |
de4b2f76 BH |
2135 | pci_bus_add_devices(b); |
2136 | } else { | |
2137 | pci_free_resource_list(&resources); | |
2138 | } | |
2139 | return b; | |
2140 | } | |
2141 | EXPORT_SYMBOL(pci_scan_bus); | |
2142 | ||
2f320521 YL |
2143 | /** |
2144 | * pci_rescan_bus_bridge_resize - scan a PCI bus for devices. | |
2145 | * @bridge: PCI bridge for the bus to scan | |
2146 | * | |
2147 | * Scan a PCI bus and child buses for new devices, add them, | |
2148 | * and enable them, resizing bridge mmio/io resource if necessary | |
2149 | * and possible. The caller must ensure the child devices are already | |
2150 | * removed for resizing to occur. | |
2151 | * | |
2152 | * Returns the max number of subordinate bus discovered. | |
2153 | */ | |
10874f5a | 2154 | unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge) |
2f320521 YL |
2155 | { |
2156 | unsigned int max; | |
2157 | struct pci_bus *bus = bridge->subordinate; | |
2158 | ||
2159 | max = pci_scan_child_bus(bus); | |
2160 | ||
2161 | pci_assign_unassigned_bridge_resources(bridge); | |
2162 | ||
2163 | pci_bus_add_devices(bus); | |
2164 | ||
2165 | return max; | |
2166 | } | |
2167 | ||
a5213a31 YL |
2168 | /** |
2169 | * pci_rescan_bus - scan a PCI bus for devices. | |
2170 | * @bus: PCI bus to scan | |
2171 | * | |
2172 | * Scan a PCI bus and child buses for new devices, adds them, | |
2173 | * and enables them. | |
2174 | * | |
2175 | * Returns the max number of subordinate bus discovered. | |
2176 | */ | |
10874f5a | 2177 | unsigned int pci_rescan_bus(struct pci_bus *bus) |
a5213a31 YL |
2178 | { |
2179 | unsigned int max; | |
2180 | ||
2181 | max = pci_scan_child_bus(bus); | |
2182 | pci_assign_unassigned_bus_resources(bus); | |
2183 | pci_bus_add_devices(bus); | |
2184 | ||
2185 | return max; | |
2186 | } | |
2187 | EXPORT_SYMBOL_GPL(pci_rescan_bus); | |
2188 | ||
9d16947b RW |
2189 | /* |
2190 | * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal | |
2191 | * routines should always be executed under this mutex. | |
2192 | */ | |
2193 | static DEFINE_MUTEX(pci_rescan_remove_lock); | |
2194 | ||
2195 | void pci_lock_rescan_remove(void) | |
2196 | { | |
2197 | mutex_lock(&pci_rescan_remove_lock); | |
2198 | } | |
2199 | EXPORT_SYMBOL_GPL(pci_lock_rescan_remove); | |
2200 | ||
2201 | void pci_unlock_rescan_remove(void) | |
2202 | { | |
2203 | mutex_unlock(&pci_rescan_remove_lock); | |
2204 | } | |
2205 | EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove); | |
2206 | ||
3c78bc61 RD |
2207 | static int __init pci_sort_bf_cmp(const struct device *d_a, |
2208 | const struct device *d_b) | |
6b4b78fe | 2209 | { |
99178b03 GKH |
2210 | const struct pci_dev *a = to_pci_dev(d_a); |
2211 | const struct pci_dev *b = to_pci_dev(d_b); | |
2212 | ||
6b4b78fe MD |
2213 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; |
2214 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; | |
2215 | ||
2216 | if (a->bus->number < b->bus->number) return -1; | |
2217 | else if (a->bus->number > b->bus->number) return 1; | |
2218 | ||
2219 | if (a->devfn < b->devfn) return -1; | |
2220 | else if (a->devfn > b->devfn) return 1; | |
2221 | ||
2222 | return 0; | |
2223 | } | |
2224 | ||
5ff580c1 | 2225 | void __init pci_sort_breadthfirst(void) |
6b4b78fe | 2226 | { |
99178b03 | 2227 | bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); |
6b4b78fe | 2228 | } |