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 | |
67cdc827 YL |
19 | struct resource busn_resource = { |
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, |
b9d320fc | 99 | .dev_attrs = pcibus_dev_attrs, |
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 | ||
0b400c7e YZ |
159 | /** |
160 | * pci_read_base - read a PCI BAR | |
161 | * @dev: the PCI device | |
162 | * @type: type of the BAR | |
163 | * @res: resource buffer to be filled in | |
164 | * @pos: BAR position in the config space | |
165 | * | |
166 | * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. | |
6ac665c6 | 167 | */ |
0b400c7e | 168 | int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, |
6ac665c6 | 169 | struct resource *res, unsigned int pos) |
07eddf3d | 170 | { |
6ac665c6 | 171 | u32 l, sz, mask; |
253d2e54 | 172 | u16 orig_cmd; |
5bfa14ed | 173 | struct pci_bus_region region; |
0ff9514b | 174 | bool bar_too_big = false, bar_disabled = false; |
6ac665c6 | 175 | |
1ed67439 | 176 | mask = type ? PCI_ROM_ADDRESS_MASK : ~0; |
6ac665c6 | 177 | |
0ff9514b | 178 | /* No printks while decoding is disabled! */ |
253d2e54 JP |
179 | if (!dev->mmio_always_on) { |
180 | pci_read_config_word(dev, PCI_COMMAND, &orig_cmd); | |
181 | pci_write_config_word(dev, PCI_COMMAND, | |
182 | orig_cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO)); | |
183 | } | |
184 | ||
6ac665c6 MW |
185 | res->name = pci_name(dev); |
186 | ||
187 | pci_read_config_dword(dev, pos, &l); | |
1ed67439 | 188 | pci_write_config_dword(dev, pos, l | mask); |
6ac665c6 MW |
189 | pci_read_config_dword(dev, pos, &sz); |
190 | pci_write_config_dword(dev, pos, l); | |
191 | ||
192 | /* | |
193 | * All bits set in sz means the device isn't working properly. | |
45aa23b4 BH |
194 | * If the BAR isn't implemented, all bits must be 0. If it's a |
195 | * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit | |
196 | * 1 must be clear. | |
6ac665c6 | 197 | */ |
45aa23b4 | 198 | if (!sz || sz == 0xffffffff) |
6ac665c6 MW |
199 | goto fail; |
200 | ||
201 | /* | |
202 | * I don't know how l can have all bits set. Copied from old code. | |
203 | * Maybe it fixes a bug on some ancient platform. | |
204 | */ | |
205 | if (l == 0xffffffff) | |
206 | l = 0; | |
207 | ||
208 | if (type == pci_bar_unknown) { | |
28c6821a BH |
209 | res->flags = decode_bar(dev, l); |
210 | res->flags |= IORESOURCE_SIZEALIGN; | |
211 | if (res->flags & IORESOURCE_IO) { | |
6ac665c6 | 212 | l &= PCI_BASE_ADDRESS_IO_MASK; |
9670f1a4 | 213 | sz &= PCI_BASE_ADDRESS_IO_MASK; |
5aceca9d | 214 | mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT; |
6ac665c6 MW |
215 | } else { |
216 | l &= PCI_BASE_ADDRESS_MEM_MASK; | |
9670f1a4 | 217 | sz &= PCI_BASE_ADDRESS_MEM_MASK; |
6ac665c6 MW |
218 | mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; |
219 | } | |
220 | } else { | |
221 | res->flags |= (l & IORESOURCE_ROM_ENABLE); | |
222 | l &= PCI_ROM_ADDRESS_MASK; | |
9670f1a4 | 223 | sz &= PCI_ROM_ADDRESS_MASK; |
6ac665c6 MW |
224 | mask = (u32)PCI_ROM_ADDRESS_MASK; |
225 | } | |
226 | ||
28c6821a | 227 | if (res->flags & IORESOURCE_MEM_64) { |
6ac665c6 MW |
228 | u64 l64 = l; |
229 | u64 sz64 = sz; | |
230 | u64 mask64 = mask | (u64)~0 << 32; | |
231 | ||
232 | pci_read_config_dword(dev, pos + 4, &l); | |
233 | pci_write_config_dword(dev, pos + 4, ~0); | |
234 | pci_read_config_dword(dev, pos + 4, &sz); | |
235 | pci_write_config_dword(dev, pos + 4, l); | |
236 | ||
237 | l64 |= ((u64)l << 32); | |
238 | sz64 |= ((u64)sz << 32); | |
239 | ||
240 | sz64 = pci_size(l64, sz64, mask64); | |
241 | ||
242 | if (!sz64) | |
243 | goto fail; | |
244 | ||
cc5499c3 | 245 | if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) { |
0ff9514b | 246 | bar_too_big = true; |
6ac665c6 | 247 | goto fail; |
c7dabef8 BH |
248 | } |
249 | ||
c7dabef8 | 250 | if ((sizeof(resource_size_t) < 8) && l) { |
6ac665c6 MW |
251 | /* Address above 32-bit boundary; disable the BAR */ |
252 | pci_write_config_dword(dev, pos, 0); | |
253 | pci_write_config_dword(dev, pos + 4, 0); | |
5bfa14ed BH |
254 | region.start = 0; |
255 | region.end = sz64; | |
fb127cb9 | 256 | pcibios_bus_to_resource(dev, res, ®ion); |
0ff9514b | 257 | bar_disabled = true; |
6ac665c6 | 258 | } else { |
5bfa14ed BH |
259 | region.start = l64; |
260 | region.end = l64 + sz64; | |
fb127cb9 | 261 | pcibios_bus_to_resource(dev, res, ®ion); |
6ac665c6 MW |
262 | } |
263 | } else { | |
45aa23b4 | 264 | sz = pci_size(l, sz, mask); |
6ac665c6 | 265 | |
45aa23b4 | 266 | if (!sz) |
6ac665c6 MW |
267 | goto fail; |
268 | ||
5bfa14ed BH |
269 | region.start = l; |
270 | region.end = l + sz; | |
fb127cb9 | 271 | pcibios_bus_to_resource(dev, res, ®ion); |
6ac665c6 MW |
272 | } |
273 | ||
0ff9514b BH |
274 | goto out; |
275 | ||
276 | ||
277 | fail: | |
278 | res->flags = 0; | |
279 | out: | |
bbffe435 BH |
280 | if (!dev->mmio_always_on) |
281 | pci_write_config_word(dev, PCI_COMMAND, orig_cmd); | |
282 | ||
0ff9514b BH |
283 | if (bar_too_big) |
284 | dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n", pos); | |
285 | if (res->flags && !bar_disabled) | |
286 | dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res); | |
287 | ||
28c6821a | 288 | return (res->flags & IORESOURCE_MEM_64) ? 1 : 0; |
07eddf3d YL |
289 | } |
290 | ||
1da177e4 LT |
291 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
292 | { | |
6ac665c6 | 293 | unsigned int pos, reg; |
07eddf3d | 294 | |
6ac665c6 MW |
295 | for (pos = 0; pos < howmany; pos++) { |
296 | struct resource *res = &dev->resource[pos]; | |
1da177e4 | 297 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); |
6ac665c6 | 298 | pos += __pci_read_base(dev, pci_bar_unknown, res, reg); |
1da177e4 | 299 | } |
6ac665c6 | 300 | |
1da177e4 | 301 | if (rom) { |
6ac665c6 | 302 | struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; |
1da177e4 | 303 | dev->rom_base_reg = rom; |
6ac665c6 MW |
304 | res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | |
305 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE | | |
306 | IORESOURCE_SIZEALIGN; | |
307 | __pci_read_base(dev, pci_bar_mem32, res, rom); | |
1da177e4 LT |
308 | } |
309 | } | |
310 | ||
15856ad5 | 311 | static void pci_read_bridge_io(struct pci_bus *child) |
1da177e4 LT |
312 | { |
313 | struct pci_dev *dev = child->self; | |
314 | u8 io_base_lo, io_limit_lo; | |
2b28ae19 | 315 | unsigned long io_mask, io_granularity, base, limit; |
5bfa14ed | 316 | struct pci_bus_region region; |
2b28ae19 BH |
317 | struct resource *res; |
318 | ||
319 | io_mask = PCI_IO_RANGE_MASK; | |
320 | io_granularity = 0x1000; | |
321 | if (dev->io_window_1k) { | |
322 | /* Support 1K I/O space granularity */ | |
323 | io_mask = PCI_IO_1K_RANGE_MASK; | |
324 | io_granularity = 0x400; | |
325 | } | |
1da177e4 | 326 | |
1da177e4 LT |
327 | res = child->resource[0]; |
328 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); | |
329 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); | |
2b28ae19 BH |
330 | base = (io_base_lo & io_mask) << 8; |
331 | limit = (io_limit_lo & io_mask) << 8; | |
1da177e4 LT |
332 | |
333 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { | |
334 | u16 io_base_hi, io_limit_hi; | |
8f38eaca | 335 | |
1da177e4 LT |
336 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); |
337 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); | |
8f38eaca BH |
338 | base |= ((unsigned long) io_base_hi << 16); |
339 | limit |= ((unsigned long) io_limit_hi << 16); | |
1da177e4 LT |
340 | } |
341 | ||
5dde383e | 342 | if (base <= limit) { |
1da177e4 | 343 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; |
5bfa14ed | 344 | region.start = base; |
2b28ae19 BH |
345 | region.end = limit + io_granularity - 1; |
346 | pcibios_bus_to_resource(dev, res, ®ion); | |
c7dabef8 | 347 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 | 348 | } |
fa27b2d1 BH |
349 | } |
350 | ||
15856ad5 | 351 | static void pci_read_bridge_mmio(struct pci_bus *child) |
fa27b2d1 BH |
352 | { |
353 | struct pci_dev *dev = child->self; | |
354 | u16 mem_base_lo, mem_limit_lo; | |
355 | unsigned long base, limit; | |
5bfa14ed | 356 | struct pci_bus_region region; |
fa27b2d1 | 357 | struct resource *res; |
1da177e4 LT |
358 | |
359 | res = child->resource[1]; | |
360 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); | |
361 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); | |
8f38eaca BH |
362 | base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; |
363 | limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
5dde383e | 364 | if (base <= limit) { |
1da177e4 | 365 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; |
5bfa14ed BH |
366 | region.start = base; |
367 | region.end = limit + 0xfffff; | |
fb127cb9 | 368 | pcibios_bus_to_resource(dev, res, ®ion); |
c7dabef8 | 369 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 | 370 | } |
fa27b2d1 BH |
371 | } |
372 | ||
15856ad5 | 373 | static void pci_read_bridge_mmio_pref(struct pci_bus *child) |
fa27b2d1 BH |
374 | { |
375 | struct pci_dev *dev = child->self; | |
376 | u16 mem_base_lo, mem_limit_lo; | |
377 | unsigned long base, limit; | |
5bfa14ed | 378 | struct pci_bus_region region; |
fa27b2d1 | 379 | struct resource *res; |
1da177e4 LT |
380 | |
381 | res = child->resource[2]; | |
382 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); | |
383 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); | |
8f38eaca BH |
384 | base = ((unsigned long) mem_base_lo & PCI_PREF_RANGE_MASK) << 16; |
385 | limit = ((unsigned long) mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; | |
1da177e4 LT |
386 | |
387 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { | |
388 | u32 mem_base_hi, mem_limit_hi; | |
8f38eaca | 389 | |
1da177e4 LT |
390 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); |
391 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); | |
392 | ||
393 | /* | |
394 | * Some bridges set the base > limit by default, and some | |
395 | * (broken) BIOSes do not initialize them. If we find | |
396 | * this, just assume they are not being used. | |
397 | */ | |
398 | if (mem_base_hi <= mem_limit_hi) { | |
399 | #if BITS_PER_LONG == 64 | |
8f38eaca BH |
400 | base |= ((unsigned long) mem_base_hi) << 32; |
401 | limit |= ((unsigned long) mem_limit_hi) << 32; | |
1da177e4 LT |
402 | #else |
403 | if (mem_base_hi || mem_limit_hi) { | |
80ccba11 BH |
404 | dev_err(&dev->dev, "can't handle 64-bit " |
405 | "address space for bridge\n"); | |
1da177e4 LT |
406 | return; |
407 | } | |
408 | #endif | |
409 | } | |
410 | } | |
5dde383e | 411 | if (base <= limit) { |
1f82de10 YL |
412 | res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | |
413 | IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
414 | if (res->flags & PCI_PREF_RANGE_TYPE_64) | |
415 | res->flags |= IORESOURCE_MEM_64; | |
5bfa14ed BH |
416 | region.start = base; |
417 | region.end = limit + 0xfffff; | |
fb127cb9 | 418 | pcibios_bus_to_resource(dev, res, ®ion); |
c7dabef8 | 419 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 LT |
420 | } |
421 | } | |
422 | ||
15856ad5 | 423 | void pci_read_bridge_bases(struct pci_bus *child) |
fa27b2d1 BH |
424 | { |
425 | struct pci_dev *dev = child->self; | |
2fe2abf8 | 426 | struct resource *res; |
fa27b2d1 BH |
427 | int i; |
428 | ||
429 | if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ | |
430 | return; | |
431 | ||
b918c62e YL |
432 | dev_info(&dev->dev, "PCI bridge to %pR%s\n", |
433 | &child->busn_res, | |
fa27b2d1 BH |
434 | dev->transparent ? " (subtractive decode)" : ""); |
435 | ||
2fe2abf8 BH |
436 | pci_bus_remove_resources(child); |
437 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
438 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; | |
439 | ||
fa27b2d1 BH |
440 | pci_read_bridge_io(child); |
441 | pci_read_bridge_mmio(child); | |
442 | pci_read_bridge_mmio_pref(child); | |
2adf7516 BH |
443 | |
444 | if (dev->transparent) { | |
2fe2abf8 BH |
445 | pci_bus_for_each_resource(child->parent, res, i) { |
446 | if (res) { | |
447 | pci_bus_add_resource(child, res, | |
448 | PCI_SUBTRACTIVE_DECODE); | |
2adf7516 BH |
449 | dev_printk(KERN_DEBUG, &dev->dev, |
450 | " bridge window %pR (subtractive decode)\n", | |
2fe2abf8 BH |
451 | res); |
452 | } | |
2adf7516 BH |
453 | } |
454 | } | |
fa27b2d1 BH |
455 | } |
456 | ||
96bde06a | 457 | static struct pci_bus * pci_alloc_bus(void) |
1da177e4 LT |
458 | { |
459 | struct pci_bus *b; | |
460 | ||
f5afe806 | 461 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
1da177e4 | 462 | if (b) { |
1da177e4 LT |
463 | INIT_LIST_HEAD(&b->node); |
464 | INIT_LIST_HEAD(&b->children); | |
465 | INIT_LIST_HEAD(&b->devices); | |
f46753c5 | 466 | INIT_LIST_HEAD(&b->slots); |
2fe2abf8 | 467 | INIT_LIST_HEAD(&b->resources); |
3749c51a MW |
468 | b->max_bus_speed = PCI_SPEED_UNKNOWN; |
469 | b->cur_bus_speed = PCI_SPEED_UNKNOWN; | |
1da177e4 LT |
470 | } |
471 | return b; | |
472 | } | |
473 | ||
7b543663 YL |
474 | static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) |
475 | { | |
476 | struct pci_host_bridge *bridge; | |
477 | ||
478 | bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); | |
479 | if (bridge) { | |
480 | INIT_LIST_HEAD(&bridge->windows); | |
481 | bridge->bus = b; | |
482 | } | |
483 | ||
484 | return bridge; | |
485 | } | |
486 | ||
9be60ca0 MW |
487 | static unsigned char pcix_bus_speed[] = { |
488 | PCI_SPEED_UNKNOWN, /* 0 */ | |
489 | PCI_SPEED_66MHz_PCIX, /* 1 */ | |
490 | PCI_SPEED_100MHz_PCIX, /* 2 */ | |
491 | PCI_SPEED_133MHz_PCIX, /* 3 */ | |
492 | PCI_SPEED_UNKNOWN, /* 4 */ | |
493 | PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ | |
494 | PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ | |
495 | PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ | |
496 | PCI_SPEED_UNKNOWN, /* 8 */ | |
497 | PCI_SPEED_66MHz_PCIX_266, /* 9 */ | |
498 | PCI_SPEED_100MHz_PCIX_266, /* A */ | |
499 | PCI_SPEED_133MHz_PCIX_266, /* B */ | |
500 | PCI_SPEED_UNKNOWN, /* C */ | |
501 | PCI_SPEED_66MHz_PCIX_533, /* D */ | |
502 | PCI_SPEED_100MHz_PCIX_533, /* E */ | |
503 | PCI_SPEED_133MHz_PCIX_533 /* F */ | |
504 | }; | |
505 | ||
3749c51a MW |
506 | static unsigned char pcie_link_speed[] = { |
507 | PCI_SPEED_UNKNOWN, /* 0 */ | |
508 | PCIE_SPEED_2_5GT, /* 1 */ | |
509 | PCIE_SPEED_5_0GT, /* 2 */ | |
9dfd97fe | 510 | PCIE_SPEED_8_0GT, /* 3 */ |
3749c51a MW |
511 | PCI_SPEED_UNKNOWN, /* 4 */ |
512 | PCI_SPEED_UNKNOWN, /* 5 */ | |
513 | PCI_SPEED_UNKNOWN, /* 6 */ | |
514 | PCI_SPEED_UNKNOWN, /* 7 */ | |
515 | PCI_SPEED_UNKNOWN, /* 8 */ | |
516 | PCI_SPEED_UNKNOWN, /* 9 */ | |
517 | PCI_SPEED_UNKNOWN, /* A */ | |
518 | PCI_SPEED_UNKNOWN, /* B */ | |
519 | PCI_SPEED_UNKNOWN, /* C */ | |
520 | PCI_SPEED_UNKNOWN, /* D */ | |
521 | PCI_SPEED_UNKNOWN, /* E */ | |
522 | PCI_SPEED_UNKNOWN /* F */ | |
523 | }; | |
524 | ||
525 | void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) | |
526 | { | |
231afea1 | 527 | bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS]; |
3749c51a MW |
528 | } |
529 | EXPORT_SYMBOL_GPL(pcie_update_link_speed); | |
530 | ||
45b4cdd5 MW |
531 | static unsigned char agp_speeds[] = { |
532 | AGP_UNKNOWN, | |
533 | AGP_1X, | |
534 | AGP_2X, | |
535 | AGP_4X, | |
536 | AGP_8X | |
537 | }; | |
538 | ||
539 | static enum pci_bus_speed agp_speed(int agp3, int agpstat) | |
540 | { | |
541 | int index = 0; | |
542 | ||
543 | if (agpstat & 4) | |
544 | index = 3; | |
545 | else if (agpstat & 2) | |
546 | index = 2; | |
547 | else if (agpstat & 1) | |
548 | index = 1; | |
549 | else | |
550 | goto out; | |
551 | ||
552 | if (agp3) { | |
553 | index += 2; | |
554 | if (index == 5) | |
555 | index = 0; | |
556 | } | |
557 | ||
558 | out: | |
559 | return agp_speeds[index]; | |
560 | } | |
561 | ||
562 | ||
9be60ca0 MW |
563 | static void pci_set_bus_speed(struct pci_bus *bus) |
564 | { | |
565 | struct pci_dev *bridge = bus->self; | |
566 | int pos; | |
567 | ||
45b4cdd5 MW |
568 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); |
569 | if (!pos) | |
570 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); | |
571 | if (pos) { | |
572 | u32 agpstat, agpcmd; | |
573 | ||
574 | pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); | |
575 | bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); | |
576 | ||
577 | pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); | |
578 | bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); | |
579 | } | |
580 | ||
9be60ca0 MW |
581 | pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); |
582 | if (pos) { | |
583 | u16 status; | |
584 | enum pci_bus_speed max; | |
9be60ca0 | 585 | |
7793eeab BH |
586 | pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS, |
587 | &status); | |
588 | ||
589 | if (status & PCI_X_SSTATUS_533MHZ) { | |
9be60ca0 | 590 | max = PCI_SPEED_133MHz_PCIX_533; |
7793eeab | 591 | } else if (status & PCI_X_SSTATUS_266MHZ) { |
9be60ca0 | 592 | max = PCI_SPEED_133MHz_PCIX_266; |
7793eeab BH |
593 | } else if (status & PCI_X_SSTATUS_133MHZ) { |
594 | if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) { | |
9be60ca0 MW |
595 | max = PCI_SPEED_133MHz_PCIX_ECC; |
596 | } else { | |
597 | max = PCI_SPEED_133MHz_PCIX; | |
598 | } | |
599 | } else { | |
600 | max = PCI_SPEED_66MHz_PCIX; | |
601 | } | |
602 | ||
603 | bus->max_bus_speed = max; | |
7793eeab BH |
604 | bus->cur_bus_speed = pcix_bus_speed[ |
605 | (status & PCI_X_SSTATUS_FREQ) >> 6]; | |
9be60ca0 MW |
606 | |
607 | return; | |
608 | } | |
609 | ||
610 | pos = pci_find_capability(bridge, PCI_CAP_ID_EXP); | |
611 | if (pos) { | |
612 | u32 linkcap; | |
613 | u16 linksta; | |
614 | ||
59875ae4 | 615 | pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap); |
231afea1 | 616 | bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS]; |
9be60ca0 | 617 | |
59875ae4 | 618 | pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta); |
9be60ca0 MW |
619 | pcie_update_link_speed(bus, linksta); |
620 | } | |
621 | } | |
622 | ||
623 | ||
cbd4e055 AB |
624 | static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, |
625 | struct pci_dev *bridge, int busnr) | |
1da177e4 LT |
626 | { |
627 | struct pci_bus *child; | |
628 | int i; | |
4f535093 | 629 | int ret; |
1da177e4 LT |
630 | |
631 | /* | |
632 | * Allocate a new bus, and inherit stuff from the parent.. | |
633 | */ | |
634 | child = pci_alloc_bus(); | |
635 | if (!child) | |
636 | return NULL; | |
637 | ||
1da177e4 LT |
638 | child->parent = parent; |
639 | child->ops = parent->ops; | |
640 | child->sysdata = parent->sysdata; | |
6e325a62 | 641 | child->bus_flags = parent->bus_flags; |
1da177e4 | 642 | |
fd7d1ced | 643 | /* initialize some portions of the bus device, but don't register it |
4f535093 | 644 | * now as the parent is not properly set up yet. |
fd7d1ced GKH |
645 | */ |
646 | child->dev.class = &pcibus_class; | |
1a927133 | 647 | dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); |
1da177e4 LT |
648 | |
649 | /* | |
650 | * Set up the primary, secondary and subordinate | |
651 | * bus numbers. | |
652 | */ | |
b918c62e YL |
653 | child->number = child->busn_res.start = busnr; |
654 | child->primary = parent->busn_res.start; | |
655 | child->busn_res.end = 0xff; | |
1da177e4 | 656 | |
4f535093 YL |
657 | if (!bridge) { |
658 | child->dev.parent = parent->bridge; | |
659 | goto add_dev; | |
660 | } | |
3789fa8a YZ |
661 | |
662 | child->self = bridge; | |
663 | child->bridge = get_device(&bridge->dev); | |
4f535093 | 664 | child->dev.parent = child->bridge; |
98d9f30c | 665 | pci_set_bus_of_node(child); |
9be60ca0 MW |
666 | pci_set_bus_speed(child); |
667 | ||
1da177e4 | 668 | /* Set up default resource pointers and names.. */ |
fde09c6d | 669 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { |
1da177e4 LT |
670 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; |
671 | child->resource[i]->name = child->name; | |
672 | } | |
673 | bridge->subordinate = child; | |
674 | ||
4f535093 YL |
675 | add_dev: |
676 | ret = device_register(&child->dev); | |
677 | WARN_ON(ret < 0); | |
678 | ||
10a95747 JL |
679 | pcibios_add_bus(child); |
680 | ||
4f535093 YL |
681 | /* Create legacy_io and legacy_mem files for this bus */ |
682 | pci_create_legacy_files(child); | |
683 | ||
1da177e4 LT |
684 | return child; |
685 | } | |
686 | ||
451124a7 | 687 | struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) |
1da177e4 LT |
688 | { |
689 | struct pci_bus *child; | |
690 | ||
691 | child = pci_alloc_child_bus(parent, dev, busnr); | |
e4ea9bb7 | 692 | if (child) { |
d71374da | 693 | down_write(&pci_bus_sem); |
1da177e4 | 694 | list_add_tail(&child->node, &parent->children); |
d71374da | 695 | up_write(&pci_bus_sem); |
e4ea9bb7 | 696 | } |
1da177e4 LT |
697 | return child; |
698 | } | |
699 | ||
96bde06a | 700 | static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) |
26f674ae GKH |
701 | { |
702 | struct pci_bus *parent = child->parent; | |
12f44f46 IK |
703 | |
704 | /* Attempts to fix that up are really dangerous unless | |
705 | we're going to re-assign all bus numbers. */ | |
706 | if (!pcibios_assign_all_busses()) | |
707 | return; | |
708 | ||
b918c62e YL |
709 | while (parent->parent && parent->busn_res.end < max) { |
710 | parent->busn_res.end = max; | |
26f674ae GKH |
711 | pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max); |
712 | parent = parent->parent; | |
713 | } | |
714 | } | |
715 | ||
1da177e4 LT |
716 | /* |
717 | * If it's a bridge, configure it and scan the bus behind it. | |
718 | * For CardBus bridges, we don't scan behind as the devices will | |
719 | * be handled by the bridge driver itself. | |
720 | * | |
721 | * We need to process bridges in two passes -- first we scan those | |
722 | * already configured by the BIOS and after we are done with all of | |
723 | * them, we proceed to assigning numbers to the remaining buses in | |
724 | * order to avoid overlaps between old and new bus numbers. | |
725 | */ | |
15856ad5 | 726 | int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) |
1da177e4 LT |
727 | { |
728 | struct pci_bus *child; | |
729 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); | |
49887941 | 730 | u32 buses, i, j = 0; |
1da177e4 | 731 | u16 bctl; |
99ddd552 | 732 | u8 primary, secondary, subordinate; |
a1c19894 | 733 | int broken = 0; |
1da177e4 LT |
734 | |
735 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); | |
99ddd552 BH |
736 | primary = buses & 0xFF; |
737 | secondary = (buses >> 8) & 0xFF; | |
738 | subordinate = (buses >> 16) & 0xFF; | |
1da177e4 | 739 | |
99ddd552 BH |
740 | dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", |
741 | secondary, subordinate, pass); | |
1da177e4 | 742 | |
71f6bd4a YL |
743 | if (!primary && (primary != bus->number) && secondary && subordinate) { |
744 | dev_warn(&dev->dev, "Primary bus is hard wired to 0\n"); | |
745 | primary = bus->number; | |
746 | } | |
747 | ||
a1c19894 BH |
748 | /* Check if setup is sensible at all */ |
749 | if (!pass && | |
1965f66e YL |
750 | (primary != bus->number || secondary <= bus->number || |
751 | secondary > subordinate)) { | |
752 | dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n", | |
753 | secondary, subordinate); | |
a1c19894 BH |
754 | broken = 1; |
755 | } | |
756 | ||
1da177e4 LT |
757 | /* Disable MasterAbortMode during probing to avoid reporting |
758 | of bus errors (in some architectures) */ | |
759 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); | |
760 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, | |
761 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); | |
762 | ||
99ddd552 BH |
763 | if ((secondary || subordinate) && !pcibios_assign_all_busses() && |
764 | !is_cardbus && !broken) { | |
765 | unsigned int cmax; | |
1da177e4 LT |
766 | /* |
767 | * Bus already configured by firmware, process it in the first | |
768 | * pass and just note the configuration. | |
769 | */ | |
770 | if (pass) | |
bbe8f9a3 | 771 | goto out; |
1da177e4 LT |
772 | |
773 | /* | |
774 | * If we already got to this bus through a different bridge, | |
74710ded AC |
775 | * don't re-add it. This can happen with the i450NX chipset. |
776 | * | |
777 | * However, we continue to descend down the hierarchy and | |
778 | * scan remaining child buses. | |
1da177e4 | 779 | */ |
99ddd552 | 780 | child = pci_find_bus(pci_domain_nr(bus), secondary); |
74710ded | 781 | if (!child) { |
99ddd552 | 782 | child = pci_add_new_bus(bus, dev, secondary); |
74710ded AC |
783 | if (!child) |
784 | goto out; | |
99ddd552 | 785 | child->primary = primary; |
bc76b731 | 786 | pci_bus_insert_busn_res(child, secondary, subordinate); |
74710ded | 787 | child->bridge_ctl = bctl; |
1da177e4 LT |
788 | } |
789 | ||
1da177e4 LT |
790 | cmax = pci_scan_child_bus(child); |
791 | if (cmax > max) | |
792 | max = cmax; | |
b918c62e YL |
793 | if (child->busn_res.end > max) |
794 | max = child->busn_res.end; | |
1da177e4 LT |
795 | } else { |
796 | /* | |
797 | * We need to assign a number to this bus which we always | |
798 | * do in the second pass. | |
799 | */ | |
12f44f46 | 800 | if (!pass) { |
a1c19894 | 801 | if (pcibios_assign_all_busses() || broken) |
12f44f46 IK |
802 | /* Temporarily disable forwarding of the |
803 | configuration cycles on all bridges in | |
804 | this bus segment to avoid possible | |
805 | conflicts in the second pass between two | |
806 | bridges programmed with overlapping | |
807 | bus ranges. */ | |
808 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, | |
809 | buses & ~0xffffff); | |
bbe8f9a3 | 810 | goto out; |
12f44f46 | 811 | } |
1da177e4 LT |
812 | |
813 | /* Clear errors */ | |
814 | pci_write_config_word(dev, PCI_STATUS, 0xffff); | |
815 | ||
cc57450f | 816 | /* Prevent assigning a bus number that already exists. |
b1a98b69 TC |
817 | * This can happen when a bridge is hot-plugged, so in |
818 | * this case we only re-scan this bus. */ | |
819 | child = pci_find_bus(pci_domain_nr(bus), max+1); | |
820 | if (!child) { | |
821 | child = pci_add_new_bus(bus, dev, ++max); | |
822 | if (!child) | |
823 | goto out; | |
bc76b731 | 824 | pci_bus_insert_busn_res(child, max, 0xff); |
b1a98b69 | 825 | } |
1da177e4 LT |
826 | buses = (buses & 0xff000000) |
827 | | ((unsigned int)(child->primary) << 0) | |
b918c62e YL |
828 | | ((unsigned int)(child->busn_res.start) << 8) |
829 | | ((unsigned int)(child->busn_res.end) << 16); | |
1da177e4 LT |
830 | |
831 | /* | |
832 | * yenta.c forces a secondary latency timer of 176. | |
833 | * Copy that behaviour here. | |
834 | */ | |
835 | if (is_cardbus) { | |
836 | buses &= ~0xff000000; | |
837 | buses |= CARDBUS_LATENCY_TIMER << 24; | |
838 | } | |
7c867c88 | 839 | |
1da177e4 LT |
840 | /* |
841 | * We need to blast all three values with a single write. | |
842 | */ | |
843 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); | |
844 | ||
845 | if (!is_cardbus) { | |
11949255 | 846 | child->bridge_ctl = bctl; |
26f674ae GKH |
847 | /* |
848 | * Adjust subordinate busnr in parent buses. | |
849 | * We do this before scanning for children because | |
850 | * some devices may not be detected if the bios | |
851 | * was lazy. | |
852 | */ | |
853 | pci_fixup_parent_subordinate_busnr(child, max); | |
1da177e4 LT |
854 | /* Now we can scan all subordinate buses... */ |
855 | max = pci_scan_child_bus(child); | |
e3ac86d8 KA |
856 | /* |
857 | * now fix it up again since we have found | |
858 | * the real value of max. | |
859 | */ | |
860 | pci_fixup_parent_subordinate_busnr(child, max); | |
1da177e4 LT |
861 | } else { |
862 | /* | |
863 | * For CardBus bridges, we leave 4 bus numbers | |
864 | * as cards with a PCI-to-PCI bridge can be | |
865 | * inserted later. | |
866 | */ | |
49887941 DB |
867 | for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) { |
868 | struct pci_bus *parent = bus; | |
cc57450f RS |
869 | if (pci_find_bus(pci_domain_nr(bus), |
870 | max+i+1)) | |
871 | break; | |
49887941 DB |
872 | while (parent->parent) { |
873 | if ((!pcibios_assign_all_busses()) && | |
b918c62e YL |
874 | (parent->busn_res.end > max) && |
875 | (parent->busn_res.end <= max+i)) { | |
49887941 DB |
876 | j = 1; |
877 | } | |
878 | parent = parent->parent; | |
879 | } | |
880 | if (j) { | |
881 | /* | |
882 | * Often, there are two cardbus bridges | |
883 | * -- try to leave one valid bus number | |
884 | * for each one. | |
885 | */ | |
886 | i /= 2; | |
887 | break; | |
888 | } | |
889 | } | |
cc57450f | 890 | max += i; |
26f674ae | 891 | pci_fixup_parent_subordinate_busnr(child, max); |
1da177e4 LT |
892 | } |
893 | /* | |
894 | * Set the subordinate bus number to its real value. | |
895 | */ | |
bc76b731 | 896 | pci_bus_update_busn_res_end(child, max); |
1da177e4 LT |
897 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); |
898 | } | |
899 | ||
cb3576fa GH |
900 | sprintf(child->name, |
901 | (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), | |
902 | pci_domain_nr(bus), child->number); | |
1da177e4 | 903 | |
d55bef51 | 904 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
49887941 | 905 | while (bus->parent) { |
b918c62e YL |
906 | if ((child->busn_res.end > bus->busn_res.end) || |
907 | (child->number > bus->busn_res.end) || | |
49887941 | 908 | (child->number < bus->number) || |
b918c62e YL |
909 | (child->busn_res.end < bus->number)) { |
910 | dev_info(&child->dev, "%pR %s " | |
911 | "hidden behind%s bridge %s %pR\n", | |
912 | &child->busn_res, | |
913 | (bus->number > child->busn_res.end && | |
914 | bus->busn_res.end < child->number) ? | |
a6f29a98 JP |
915 | "wholly" : "partially", |
916 | bus->self->transparent ? " transparent" : "", | |
865df576 | 917 | dev_name(&bus->dev), |
b918c62e | 918 | &bus->busn_res); |
49887941 DB |
919 | } |
920 | bus = bus->parent; | |
921 | } | |
922 | ||
bbe8f9a3 RB |
923 | out: |
924 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); | |
925 | ||
1da177e4 LT |
926 | return max; |
927 | } | |
928 | ||
929 | /* | |
930 | * Read interrupt line and base address registers. | |
931 | * The architecture-dependent code can tweak these, of course. | |
932 | */ | |
933 | static void pci_read_irq(struct pci_dev *dev) | |
934 | { | |
935 | unsigned char irq; | |
936 | ||
937 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); | |
ffeff788 | 938 | dev->pin = irq; |
1da177e4 LT |
939 | if (irq) |
940 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); | |
941 | dev->irq = irq; | |
942 | } | |
943 | ||
bb209c82 | 944 | void set_pcie_port_type(struct pci_dev *pdev) |
480b93b7 YZ |
945 | { |
946 | int pos; | |
947 | u16 reg16; | |
948 | ||
949 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
950 | if (!pos) | |
951 | return; | |
952 | pdev->is_pcie = 1; | |
0efea000 | 953 | pdev->pcie_cap = pos; |
480b93b7 | 954 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
786e2288 | 955 | pdev->pcie_flags_reg = reg16; |
b03e7495 JM |
956 | pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); |
957 | pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; | |
480b93b7 YZ |
958 | } |
959 | ||
bb209c82 | 960 | void set_pcie_hotplug_bridge(struct pci_dev *pdev) |
28760489 | 961 | { |
28760489 EB |
962 | u32 reg32; |
963 | ||
59875ae4 | 964 | pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); |
28760489 EB |
965 | if (reg32 & PCI_EXP_SLTCAP_HPC) |
966 | pdev->is_hotplug_bridge = 1; | |
967 | } | |
968 | ||
01abc2aa | 969 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
76e6a1d6 | 970 | |
1da177e4 LT |
971 | /** |
972 | * pci_setup_device - fill in class and map information of a device | |
973 | * @dev: the device structure to fill | |
974 | * | |
975 | * Initialize the device structure with information about the device's | |
976 | * vendor,class,memory and IO-space addresses,IRQ lines etc. | |
977 | * Called at initialisation of the PCI subsystem and by CardBus services. | |
480b93b7 YZ |
978 | * Returns 0 on success and negative if unknown type of device (not normal, |
979 | * bridge or CardBus). | |
1da177e4 | 980 | */ |
480b93b7 | 981 | int pci_setup_device(struct pci_dev *dev) |
1da177e4 LT |
982 | { |
983 | u32 class; | |
480b93b7 YZ |
984 | u8 hdr_type; |
985 | struct pci_slot *slot; | |
bc577d2b | 986 | int pos = 0; |
5bfa14ed BH |
987 | struct pci_bus_region region; |
988 | struct resource *res; | |
480b93b7 YZ |
989 | |
990 | if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) | |
991 | return -EIO; | |
992 | ||
993 | dev->sysdata = dev->bus->sysdata; | |
994 | dev->dev.parent = dev->bus->bridge; | |
995 | dev->dev.bus = &pci_bus_type; | |
996 | dev->hdr_type = hdr_type & 0x7f; | |
997 | dev->multifunction = !!(hdr_type & 0x80); | |
480b93b7 YZ |
998 | dev->error_state = pci_channel_io_normal; |
999 | set_pcie_port_type(dev); | |
1000 | ||
1001 | list_for_each_entry(slot, &dev->bus->slots, list) | |
1002 | if (PCI_SLOT(dev->devfn) == slot->number) | |
1003 | dev->slot = slot; | |
1004 | ||
1005 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) | |
1006 | set this higher, assuming the system even supports it. */ | |
1007 | dev->dma_mask = 0xffffffff; | |
1da177e4 | 1008 | |
eebfcfb5 GKH |
1009 | dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), |
1010 | dev->bus->number, PCI_SLOT(dev->devfn), | |
1011 | PCI_FUNC(dev->devfn)); | |
1da177e4 LT |
1012 | |
1013 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); | |
b8a3a521 | 1014 | dev->revision = class & 0xff; |
2dd8ba92 | 1015 | dev->class = class >> 8; /* upper 3 bytes */ |
1da177e4 | 1016 | |
2dd8ba92 YL |
1017 | dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n", |
1018 | dev->vendor, dev->device, dev->hdr_type, dev->class); | |
1da177e4 | 1019 | |
853346e4 YZ |
1020 | /* need to have dev->class ready */ |
1021 | dev->cfg_size = pci_cfg_space_size(dev); | |
1022 | ||
1da177e4 | 1023 | /* "Unknown power state" */ |
3fe9d19f | 1024 | dev->current_state = PCI_UNKNOWN; |
1da177e4 LT |
1025 | |
1026 | /* Early fixups, before probing the BARs */ | |
1027 | pci_fixup_device(pci_fixup_early, dev); | |
f79b1b14 YZ |
1028 | /* device class may be changed after fixup */ |
1029 | class = dev->class >> 8; | |
1da177e4 LT |
1030 | |
1031 | switch (dev->hdr_type) { /* header type */ | |
1032 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ | |
1033 | if (class == PCI_CLASS_BRIDGE_PCI) | |
1034 | goto bad; | |
1035 | pci_read_irq(dev); | |
1036 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); | |
1037 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1038 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); | |
368c73d4 AC |
1039 | |
1040 | /* | |
1041 | * Do the ugly legacy mode stuff here rather than broken chip | |
1042 | * quirk code. Legacy mode ATA controllers have fixed | |
1043 | * addresses. These are not always echoed in BAR0-3, and | |
1044 | * BAR0-3 in a few cases contain junk! | |
1045 | */ | |
1046 | if (class == PCI_CLASS_STORAGE_IDE) { | |
1047 | u8 progif; | |
1048 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); | |
1049 | if ((progif & 1) == 0) { | |
5bfa14ed BH |
1050 | region.start = 0x1F0; |
1051 | region.end = 0x1F7; | |
1052 | res = &dev->resource[0]; | |
1053 | res->flags = LEGACY_IO_RESOURCE; | |
fb127cb9 | 1054 | pcibios_bus_to_resource(dev, res, ®ion); |
5bfa14ed BH |
1055 | region.start = 0x3F6; |
1056 | region.end = 0x3F6; | |
1057 | res = &dev->resource[1]; | |
1058 | res->flags = LEGACY_IO_RESOURCE; | |
fb127cb9 | 1059 | pcibios_bus_to_resource(dev, res, ®ion); |
368c73d4 AC |
1060 | } |
1061 | if ((progif & 4) == 0) { | |
5bfa14ed BH |
1062 | region.start = 0x170; |
1063 | region.end = 0x177; | |
1064 | res = &dev->resource[2]; | |
1065 | res->flags = LEGACY_IO_RESOURCE; | |
fb127cb9 | 1066 | pcibios_bus_to_resource(dev, res, ®ion); |
5bfa14ed BH |
1067 | region.start = 0x376; |
1068 | region.end = 0x376; | |
1069 | res = &dev->resource[3]; | |
1070 | res->flags = LEGACY_IO_RESOURCE; | |
fb127cb9 | 1071 | pcibios_bus_to_resource(dev, res, ®ion); |
368c73d4 AC |
1072 | } |
1073 | } | |
1da177e4 LT |
1074 | break; |
1075 | ||
1076 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ | |
1077 | if (class != PCI_CLASS_BRIDGE_PCI) | |
1078 | goto bad; | |
1079 | /* The PCI-to-PCI bridge spec requires that subtractive | |
1080 | decoding (i.e. transparent) bridge must have programming | |
1081 | interface code of 0x01. */ | |
3efd273b | 1082 | pci_read_irq(dev); |
1da177e4 LT |
1083 | dev->transparent = ((dev->class & 0xff) == 1); |
1084 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); | |
28760489 | 1085 | set_pcie_hotplug_bridge(dev); |
bc577d2b GB |
1086 | pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); |
1087 | if (pos) { | |
1088 | pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); | |
1089 | pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); | |
1090 | } | |
1da177e4 LT |
1091 | break; |
1092 | ||
1093 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ | |
1094 | if (class != PCI_CLASS_BRIDGE_CARDBUS) | |
1095 | goto bad; | |
1096 | pci_read_irq(dev); | |
1097 | pci_read_bases(dev, 1, 0); | |
1098 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1099 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); | |
1100 | break; | |
1101 | ||
1102 | default: /* unknown header */ | |
80ccba11 BH |
1103 | dev_err(&dev->dev, "unknown header type %02x, " |
1104 | "ignoring device\n", dev->hdr_type); | |
480b93b7 | 1105 | return -EIO; |
1da177e4 LT |
1106 | |
1107 | bad: | |
2dd8ba92 YL |
1108 | dev_err(&dev->dev, "ignoring class %#08x (doesn't match header " |
1109 | "type %02x)\n", dev->class, dev->hdr_type); | |
1da177e4 LT |
1110 | dev->class = PCI_CLASS_NOT_DEFINED; |
1111 | } | |
1112 | ||
1113 | /* We found a fine healthy device, go go go... */ | |
1114 | return 0; | |
1115 | } | |
1116 | ||
201de56e ZY |
1117 | static void pci_release_capabilities(struct pci_dev *dev) |
1118 | { | |
1119 | pci_vpd_release(dev); | |
d1b054da | 1120 | pci_iov_release(dev); |
f796841e | 1121 | pci_free_cap_save_buffers(dev); |
201de56e ZY |
1122 | } |
1123 | ||
1da177e4 LT |
1124 | /** |
1125 | * pci_release_dev - free a pci device structure when all users of it are finished. | |
1126 | * @dev: device that's been disconnected | |
1127 | * | |
1128 | * Will be called only by the device core when all users of this pci device are | |
1129 | * done. | |
1130 | */ | |
1131 | static void pci_release_dev(struct device *dev) | |
1132 | { | |
1133 | struct pci_dev *pci_dev; | |
1134 | ||
1135 | pci_dev = to_pci_dev(dev); | |
201de56e | 1136 | pci_release_capabilities(pci_dev); |
98d9f30c | 1137 | pci_release_of_node(pci_dev); |
1da177e4 LT |
1138 | kfree(pci_dev); |
1139 | } | |
1140 | ||
1141 | /** | |
1142 | * pci_cfg_space_size - get the configuration space size of the PCI device. | |
8f7020d3 | 1143 | * @dev: PCI device |
1da177e4 LT |
1144 | * |
1145 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices | |
1146 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can | |
1147 | * access it. Maybe we don't have a way to generate extended config space | |
1148 | * accesses, or the device is behind a reverse Express bridge. So we try | |
1149 | * reading the dword at 0x100 which must either be 0 or a valid extended | |
1150 | * capability header. | |
1151 | */ | |
70b9f7dc | 1152 | int pci_cfg_space_size_ext(struct pci_dev *dev) |
1da177e4 | 1153 | { |
1da177e4 | 1154 | u32 status; |
557848c3 | 1155 | int pos = PCI_CFG_SPACE_SIZE; |
1da177e4 | 1156 | |
557848c3 | 1157 | if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) |
70b9f7dc YL |
1158 | goto fail; |
1159 | if (status == 0xffffffff) | |
1160 | goto fail; | |
1161 | ||
1162 | return PCI_CFG_SPACE_EXP_SIZE; | |
1163 | ||
1164 | fail: | |
1165 | return PCI_CFG_SPACE_SIZE; | |
1166 | } | |
1167 | ||
1168 | int pci_cfg_space_size(struct pci_dev *dev) | |
1169 | { | |
1170 | int pos; | |
1171 | u32 status; | |
dfadd9ed YL |
1172 | u16 class; |
1173 | ||
1174 | class = dev->class >> 8; | |
1175 | if (class == PCI_CLASS_BRIDGE_HOST) | |
1176 | return pci_cfg_space_size_ext(dev); | |
57741a77 | 1177 | |
59875ae4 | 1178 | if (!pci_is_pcie(dev)) { |
1da177e4 LT |
1179 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
1180 | if (!pos) | |
1181 | goto fail; | |
1182 | ||
1183 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); | |
1184 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) | |
1185 | goto fail; | |
1186 | } | |
1187 | ||
70b9f7dc | 1188 | return pci_cfg_space_size_ext(dev); |
1da177e4 LT |
1189 | |
1190 | fail: | |
1191 | return PCI_CFG_SPACE_SIZE; | |
1192 | } | |
1193 | ||
1194 | static void pci_release_bus_bridge_dev(struct device *dev) | |
1195 | { | |
7b543663 YL |
1196 | struct pci_host_bridge *bridge = to_pci_host_bridge(dev); |
1197 | ||
4fa2649a YL |
1198 | if (bridge->release_fn) |
1199 | bridge->release_fn(bridge); | |
7b543663 YL |
1200 | |
1201 | pci_free_resource_list(&bridge->windows); | |
1202 | ||
1203 | kfree(bridge); | |
1da177e4 LT |
1204 | } |
1205 | ||
65891215 ME |
1206 | struct pci_dev *alloc_pci_dev(void) |
1207 | { | |
1208 | struct pci_dev *dev; | |
1209 | ||
1210 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); | |
1211 | if (!dev) | |
1212 | return NULL; | |
1213 | ||
65891215 | 1214 | INIT_LIST_HEAD(&dev->bus_list); |
88e7b167 | 1215 | dev->dev.type = &pci_dev_type; |
65891215 ME |
1216 | |
1217 | return dev; | |
1218 | } | |
1219 | EXPORT_SYMBOL(alloc_pci_dev); | |
1220 | ||
efdc87da YL |
1221 | bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, |
1222 | int crs_timeout) | |
1da177e4 | 1223 | { |
1da177e4 LT |
1224 | int delay = 1; |
1225 | ||
efdc87da YL |
1226 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
1227 | return false; | |
1da177e4 LT |
1228 | |
1229 | /* some broken boards return 0 or ~0 if a slot is empty: */ | |
efdc87da YL |
1230 | if (*l == 0xffffffff || *l == 0x00000000 || |
1231 | *l == 0x0000ffff || *l == 0xffff0000) | |
1232 | return false; | |
1da177e4 LT |
1233 | |
1234 | /* Configuration request Retry Status */ | |
efdc87da YL |
1235 | while (*l == 0xffff0001) { |
1236 | if (!crs_timeout) | |
1237 | return false; | |
1238 | ||
1da177e4 LT |
1239 | msleep(delay); |
1240 | delay *= 2; | |
efdc87da YL |
1241 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
1242 | return false; | |
1da177e4 | 1243 | /* Card hasn't responded in 60 seconds? Must be stuck. */ |
efdc87da | 1244 | if (delay > crs_timeout) { |
80ccba11 | 1245 | printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not " |
1da177e4 LT |
1246 | "responding\n", pci_domain_nr(bus), |
1247 | bus->number, PCI_SLOT(devfn), | |
1248 | PCI_FUNC(devfn)); | |
efdc87da | 1249 | return false; |
1da177e4 LT |
1250 | } |
1251 | } | |
1252 | ||
efdc87da YL |
1253 | return true; |
1254 | } | |
1255 | EXPORT_SYMBOL(pci_bus_read_dev_vendor_id); | |
1256 | ||
1257 | /* | |
1258 | * Read the config data for a PCI device, sanity-check it | |
1259 | * and fill in the dev structure... | |
1260 | */ | |
1261 | static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) | |
1262 | { | |
1263 | struct pci_dev *dev; | |
1264 | u32 l; | |
1265 | ||
1266 | if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000)) | |
1267 | return NULL; | |
1268 | ||
bab41e9b | 1269 | dev = alloc_pci_dev(); |
1da177e4 LT |
1270 | if (!dev) |
1271 | return NULL; | |
1272 | ||
1da177e4 | 1273 | dev->bus = bus; |
1da177e4 | 1274 | dev->devfn = devfn; |
1da177e4 LT |
1275 | dev->vendor = l & 0xffff; |
1276 | dev->device = (l >> 16) & 0xffff; | |
cef354db | 1277 | |
98d9f30c BH |
1278 | pci_set_of_node(dev); |
1279 | ||
480b93b7 | 1280 | if (pci_setup_device(dev)) { |
1da177e4 LT |
1281 | kfree(dev); |
1282 | return NULL; | |
1283 | } | |
1da177e4 LT |
1284 | |
1285 | return dev; | |
1286 | } | |
1287 | ||
201de56e ZY |
1288 | static void pci_init_capabilities(struct pci_dev *dev) |
1289 | { | |
1290 | /* MSI/MSI-X list */ | |
1291 | pci_msi_init_pci_dev(dev); | |
1292 | ||
63f4898a RW |
1293 | /* Buffers for saving PCIe and PCI-X capabilities */ |
1294 | pci_allocate_cap_save_buffers(dev); | |
1295 | ||
201de56e ZY |
1296 | /* Power Management */ |
1297 | pci_pm_init(dev); | |
1298 | ||
1299 | /* Vital Product Data */ | |
1300 | pci_vpd_pci22_init(dev); | |
58c3a727 YZ |
1301 | |
1302 | /* Alternative Routing-ID Forwarding */ | |
31ab2476 | 1303 | pci_configure_ari(dev); |
d1b054da YZ |
1304 | |
1305 | /* Single Root I/O Virtualization */ | |
1306 | pci_iov_init(dev); | |
ae21ee65 AK |
1307 | |
1308 | /* Enable ACS P2P upstream forwarding */ | |
5d990b62 | 1309 | pci_enable_acs(dev); |
201de56e ZY |
1310 | } |
1311 | ||
96bde06a | 1312 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
1da177e4 | 1313 | { |
4f535093 YL |
1314 | int ret; |
1315 | ||
cdb9b9f7 PM |
1316 | device_initialize(&dev->dev); |
1317 | dev->dev.release = pci_release_dev; | |
1da177e4 | 1318 | |
7629d19a | 1319 | set_dev_node(&dev->dev, pcibus_to_node(bus)); |
cdb9b9f7 | 1320 | dev->dev.dma_mask = &dev->dma_mask; |
4d57cdfa | 1321 | dev->dev.dma_parms = &dev->dma_parms; |
cdb9b9f7 | 1322 | dev->dev.coherent_dma_mask = 0xffffffffull; |
1da177e4 | 1323 | |
4d57cdfa | 1324 | pci_set_dma_max_seg_size(dev, 65536); |
59fc67de | 1325 | pci_set_dma_seg_boundary(dev, 0xffffffff); |
4d57cdfa | 1326 | |
1da177e4 LT |
1327 | /* Fix up broken headers */ |
1328 | pci_fixup_device(pci_fixup_header, dev); | |
1329 | ||
2069ecfb YL |
1330 | /* moved out from quirk header fixup code */ |
1331 | pci_reassigndev_resource_alignment(dev); | |
1332 | ||
4b77b0a2 RW |
1333 | /* Clear the state_saved flag. */ |
1334 | dev->state_saved = false; | |
1335 | ||
201de56e ZY |
1336 | /* Initialize various capabilities */ |
1337 | pci_init_capabilities(dev); | |
eb9d0fe4 | 1338 | |
1da177e4 LT |
1339 | /* |
1340 | * Add the device to our list of discovered devices | |
1341 | * and the bus list for fixup functions, etc. | |
1342 | */ | |
d71374da | 1343 | down_write(&pci_bus_sem); |
1da177e4 | 1344 | list_add_tail(&dev->bus_list, &bus->devices); |
d71374da | 1345 | up_write(&pci_bus_sem); |
4f535093 | 1346 | |
4f535093 YL |
1347 | ret = pcibios_add_device(dev); |
1348 | WARN_ON(ret < 0); | |
1349 | ||
1350 | /* Notifier could use PCI capabilities */ | |
1351 | dev->match_driver = false; | |
1352 | ret = device_add(&dev->dev); | |
1353 | WARN_ON(ret < 0); | |
1354 | ||
1355 | pci_proc_attach_device(dev); | |
cdb9b9f7 PM |
1356 | } |
1357 | ||
451124a7 | 1358 | struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn) |
cdb9b9f7 PM |
1359 | { |
1360 | struct pci_dev *dev; | |
1361 | ||
90bdb311 TP |
1362 | dev = pci_get_slot(bus, devfn); |
1363 | if (dev) { | |
1364 | pci_dev_put(dev); | |
1365 | return dev; | |
1366 | } | |
1367 | ||
cdb9b9f7 PM |
1368 | dev = pci_scan_device(bus, devfn); |
1369 | if (!dev) | |
1370 | return NULL; | |
1371 | ||
1372 | pci_device_add(dev, bus); | |
1da177e4 LT |
1373 | |
1374 | return dev; | |
1375 | } | |
b73e9687 | 1376 | EXPORT_SYMBOL(pci_scan_single_device); |
1da177e4 | 1377 | |
b1bd58e4 | 1378 | static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn) |
f07852d6 | 1379 | { |
b1bd58e4 YW |
1380 | int pos; |
1381 | u16 cap = 0; | |
1382 | unsigned next_fn; | |
4fb88c1a | 1383 | |
b1bd58e4 YW |
1384 | if (pci_ari_enabled(bus)) { |
1385 | if (!dev) | |
1386 | return 0; | |
1387 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); | |
1388 | if (!pos) | |
1389 | return 0; | |
4fb88c1a | 1390 | |
b1bd58e4 YW |
1391 | pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap); |
1392 | next_fn = PCI_ARI_CAP_NFN(cap); | |
1393 | if (next_fn <= fn) | |
1394 | return 0; /* protect against malformed list */ | |
f07852d6 | 1395 | |
b1bd58e4 YW |
1396 | return next_fn; |
1397 | } | |
1398 | ||
1399 | /* dev may be NULL for non-contiguous multifunction devices */ | |
1400 | if (!dev || dev->multifunction) | |
1401 | return (fn + 1) % 8; | |
f07852d6 | 1402 | |
f07852d6 MW |
1403 | return 0; |
1404 | } | |
1405 | ||
1406 | static int only_one_child(struct pci_bus *bus) | |
1407 | { | |
1408 | struct pci_dev *parent = bus->self; | |
284f5f9d | 1409 | |
f07852d6 MW |
1410 | if (!parent || !pci_is_pcie(parent)) |
1411 | return 0; | |
62f87c0e | 1412 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT) |
284f5f9d | 1413 | return 1; |
62f87c0e | 1414 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM && |
284f5f9d | 1415 | !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS)) |
f07852d6 MW |
1416 | return 1; |
1417 | return 0; | |
1418 | } | |
1419 | ||
1da177e4 LT |
1420 | /** |
1421 | * pci_scan_slot - scan a PCI slot on a bus for devices. | |
1422 | * @bus: PCI bus to scan | |
1423 | * @devfn: slot number to scan (must have zero function.) | |
1424 | * | |
1425 | * Scan a PCI slot on the specified PCI bus for devices, adding | |
1426 | * discovered devices to the @bus->devices list. New devices | |
8a1bc901 | 1427 | * will not have is_added set. |
1b69dfc6 TP |
1428 | * |
1429 | * Returns the number of new devices found. | |
1da177e4 | 1430 | */ |
96bde06a | 1431 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
1da177e4 | 1432 | { |
f07852d6 | 1433 | unsigned fn, nr = 0; |
1b69dfc6 | 1434 | struct pci_dev *dev; |
f07852d6 MW |
1435 | |
1436 | if (only_one_child(bus) && (devfn > 0)) | |
1437 | return 0; /* Already scanned the entire slot */ | |
1da177e4 | 1438 | |
1b69dfc6 | 1439 | dev = pci_scan_single_device(bus, devfn); |
4fb88c1a MW |
1440 | if (!dev) |
1441 | return 0; | |
1442 | if (!dev->is_added) | |
1b69dfc6 TP |
1443 | nr++; |
1444 | ||
b1bd58e4 | 1445 | for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) { |
f07852d6 MW |
1446 | dev = pci_scan_single_device(bus, devfn + fn); |
1447 | if (dev) { | |
1448 | if (!dev->is_added) | |
1449 | nr++; | |
1450 | dev->multifunction = 1; | |
1da177e4 LT |
1451 | } |
1452 | } | |
7d715a6c | 1453 | |
149e1637 SL |
1454 | /* only one slot has pcie device */ |
1455 | if (bus->self && nr) | |
7d715a6c SL |
1456 | pcie_aspm_init_link_state(bus->self); |
1457 | ||
1da177e4 LT |
1458 | return nr; |
1459 | } | |
1460 | ||
b03e7495 JM |
1461 | static int pcie_find_smpss(struct pci_dev *dev, void *data) |
1462 | { | |
1463 | u8 *smpss = data; | |
1464 | ||
1465 | if (!pci_is_pcie(dev)) | |
1466 | return 0; | |
1467 | ||
1468 | /* For PCIE hotplug enabled slots not connected directly to a | |
1469 | * PCI-E root port, there can be problems when hotplugging | |
1470 | * devices. This is due to the possibility of hotplugging a | |
1471 | * device into the fabric with a smaller MPS that the devices | |
1472 | * currently running have configured. Modifying the MPS on the | |
1473 | * running devices could cause a fatal bus error due to an | |
1474 | * incoming frame being larger than the newly configured MPS. | |
1475 | * To work around this, the MPS for the entire fabric must be | |
1476 | * set to the minimum size. Any devices hotplugged into this | |
1477 | * fabric will have the minimum MPS set. If the PCI hotplug | |
1478 | * slot is directly connected to the root port and there are not | |
1479 | * other devices on the fabric (which seems to be the most | |
1480 | * common case), then this is not an issue and MPS discovery | |
1481 | * will occur as normal. | |
1482 | */ | |
1483 | if (dev->is_hotplug_bridge && (!list_is_singular(&dev->bus->devices) || | |
1a4b1a41 | 1484 | (dev->bus->self && |
62f87c0e | 1485 | pci_pcie_type(dev->bus->self) != PCI_EXP_TYPE_ROOT_PORT))) |
b03e7495 JM |
1486 | *smpss = 0; |
1487 | ||
1488 | if (*smpss > dev->pcie_mpss) | |
1489 | *smpss = dev->pcie_mpss; | |
1490 | ||
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | static void pcie_write_mps(struct pci_dev *dev, int mps) | |
1495 | { | |
62f392ea | 1496 | int rc; |
b03e7495 JM |
1497 | |
1498 | if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { | |
62f392ea | 1499 | mps = 128 << dev->pcie_mpss; |
b03e7495 | 1500 | |
62f87c0e YW |
1501 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT && |
1502 | dev->bus->self) | |
62f392ea | 1503 | /* For "Performance", the assumption is made that |
b03e7495 JM |
1504 | * downstream communication will never be larger than |
1505 | * the MRRS. So, the MPS only needs to be configured | |
1506 | * for the upstream communication. This being the case, | |
1507 | * walk from the top down and set the MPS of the child | |
1508 | * to that of the parent bus. | |
62f392ea JM |
1509 | * |
1510 | * Configure the device MPS with the smaller of the | |
1511 | * device MPSS or the bridge MPS (which is assumed to be | |
1512 | * properly configured at this point to the largest | |
1513 | * allowable MPS based on its parent bus). | |
b03e7495 | 1514 | */ |
62f392ea | 1515 | mps = min(mps, pcie_get_mps(dev->bus->self)); |
b03e7495 JM |
1516 | } |
1517 | ||
1518 | rc = pcie_set_mps(dev, mps); | |
1519 | if (rc) | |
1520 | dev_err(&dev->dev, "Failed attempting to set the MPS\n"); | |
1521 | } | |
1522 | ||
62f392ea | 1523 | static void pcie_write_mrrs(struct pci_dev *dev) |
b03e7495 | 1524 | { |
62f392ea | 1525 | int rc, mrrs; |
b03e7495 | 1526 | |
ed2888e9 JM |
1527 | /* In the "safe" case, do not configure the MRRS. There appear to be |
1528 | * issues with setting MRRS to 0 on a number of devices. | |
1529 | */ | |
ed2888e9 JM |
1530 | if (pcie_bus_config != PCIE_BUS_PERFORMANCE) |
1531 | return; | |
1532 | ||
ed2888e9 JM |
1533 | /* For Max performance, the MRRS must be set to the largest supported |
1534 | * value. However, it cannot be configured larger than the MPS the | |
62f392ea JM |
1535 | * device or the bus can support. This should already be properly |
1536 | * configured by a prior call to pcie_write_mps. | |
ed2888e9 | 1537 | */ |
62f392ea | 1538 | mrrs = pcie_get_mps(dev); |
b03e7495 JM |
1539 | |
1540 | /* MRRS is a R/W register. Invalid values can be written, but a | |
ed2888e9 | 1541 | * subsequent read will verify if the value is acceptable or not. |
b03e7495 JM |
1542 | * If the MRRS value provided is not acceptable (e.g., too large), |
1543 | * shrink the value until it is acceptable to the HW. | |
1544 | */ | |
1545 | while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) { | |
1546 | rc = pcie_set_readrq(dev, mrrs); | |
62f392ea JM |
1547 | if (!rc) |
1548 | break; | |
b03e7495 | 1549 | |
62f392ea | 1550 | dev_warn(&dev->dev, "Failed attempting to set the MRRS\n"); |
b03e7495 JM |
1551 | mrrs /= 2; |
1552 | } | |
62f392ea JM |
1553 | |
1554 | if (mrrs < 128) | |
1555 | dev_err(&dev->dev, "MRRS was unable to be configured with a " | |
1556 | "safe value. If problems are experienced, try running " | |
1557 | "with pci=pcie_bus_safe.\n"); | |
b03e7495 JM |
1558 | } |
1559 | ||
1560 | static int pcie_bus_configure_set(struct pci_dev *dev, void *data) | |
1561 | { | |
a513a99a | 1562 | int mps, orig_mps; |
b03e7495 JM |
1563 | |
1564 | if (!pci_is_pcie(dev)) | |
1565 | return 0; | |
1566 | ||
a513a99a JM |
1567 | mps = 128 << *(u8 *)data; |
1568 | orig_mps = pcie_get_mps(dev); | |
b03e7495 JM |
1569 | |
1570 | pcie_write_mps(dev, mps); | |
62f392ea | 1571 | pcie_write_mrrs(dev); |
b03e7495 | 1572 | |
a513a99a JM |
1573 | dev_info(&dev->dev, "PCI-E Max Payload Size set to %4d/%4d (was %4d), " |
1574 | "Max Read Rq %4d\n", pcie_get_mps(dev), 128 << dev->pcie_mpss, | |
1575 | orig_mps, pcie_get_readrq(dev)); | |
b03e7495 JM |
1576 | |
1577 | return 0; | |
1578 | } | |
1579 | ||
a513a99a | 1580 | /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down, |
b03e7495 JM |
1581 | * parents then children fashion. If this changes, then this code will not |
1582 | * work as designed. | |
1583 | */ | |
1584 | void pcie_bus_configure_settings(struct pci_bus *bus, u8 mpss) | |
1585 | { | |
5f39e670 | 1586 | u8 smpss; |
b03e7495 | 1587 | |
b03e7495 JM |
1588 | if (!pci_is_pcie(bus->self)) |
1589 | return; | |
1590 | ||
5f39e670 JM |
1591 | if (pcie_bus_config == PCIE_BUS_TUNE_OFF) |
1592 | return; | |
1593 | ||
1594 | /* FIXME - Peer to peer DMA is possible, though the endpoint would need | |
1595 | * to be aware to the MPS of the destination. To work around this, | |
1596 | * simply force the MPS of the entire system to the smallest possible. | |
1597 | */ | |
1598 | if (pcie_bus_config == PCIE_BUS_PEER2PEER) | |
1599 | smpss = 0; | |
1600 | ||
b03e7495 | 1601 | if (pcie_bus_config == PCIE_BUS_SAFE) { |
5f39e670 JM |
1602 | smpss = mpss; |
1603 | ||
b03e7495 JM |
1604 | pcie_find_smpss(bus->self, &smpss); |
1605 | pci_walk_bus(bus, pcie_find_smpss, &smpss); | |
1606 | } | |
1607 | ||
1608 | pcie_bus_configure_set(bus->self, &smpss); | |
1609 | pci_walk_bus(bus, pcie_bus_configure_set, &smpss); | |
1610 | } | |
debc3b77 | 1611 | EXPORT_SYMBOL_GPL(pcie_bus_configure_settings); |
b03e7495 | 1612 | |
15856ad5 | 1613 | unsigned int pci_scan_child_bus(struct pci_bus *bus) |
1da177e4 | 1614 | { |
b918c62e | 1615 | unsigned int devfn, pass, max = bus->busn_res.start; |
1da177e4 LT |
1616 | struct pci_dev *dev; |
1617 | ||
0207c356 | 1618 | dev_dbg(&bus->dev, "scanning bus\n"); |
1da177e4 LT |
1619 | |
1620 | /* Go find them, Rover! */ | |
1621 | for (devfn = 0; devfn < 0x100; devfn += 8) | |
1622 | pci_scan_slot(bus, devfn); | |
1623 | ||
a28724b0 YZ |
1624 | /* Reserve buses for SR-IOV capability. */ |
1625 | max += pci_iov_bus_range(bus); | |
1626 | ||
1da177e4 LT |
1627 | /* |
1628 | * After performing arch-dependent fixup of the bus, look behind | |
1629 | * all PCI-to-PCI bridges on this bus. | |
1630 | */ | |
74710ded | 1631 | if (!bus->is_added) { |
0207c356 | 1632 | dev_dbg(&bus->dev, "fixups for bus\n"); |
74710ded | 1633 | pcibios_fixup_bus(bus); |
981cf9ea | 1634 | bus->is_added = 1; |
74710ded AC |
1635 | } |
1636 | ||
1da177e4 LT |
1637 | for (pass=0; pass < 2; pass++) |
1638 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1639 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
1640 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
1641 | max = pci_scan_bridge(bus, dev, max, pass); | |
1642 | } | |
1643 | ||
1644 | /* | |
1645 | * We've scanned the bus and so we know all about what's on | |
1646 | * the other side of any bridges that may be on this bus plus | |
1647 | * any devices. | |
1648 | * | |
1649 | * Return how far we've got finding sub-buses. | |
1650 | */ | |
0207c356 | 1651 | dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); |
1da177e4 LT |
1652 | return max; |
1653 | } | |
1654 | ||
6c0cc950 RW |
1655 | /** |
1656 | * pcibios_root_bridge_prepare - Platform-specific host bridge setup. | |
1657 | * @bridge: Host bridge to set up. | |
1658 | * | |
1659 | * Default empty implementation. Replace with an architecture-specific setup | |
1660 | * routine, if necessary. | |
1661 | */ | |
1662 | int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) | |
1663 | { | |
1664 | return 0; | |
1665 | } | |
1666 | ||
10a95747 JL |
1667 | void __weak pcibios_add_bus(struct pci_bus *bus) |
1668 | { | |
1669 | } | |
1670 | ||
1671 | void __weak pcibios_remove_bus(struct pci_bus *bus) | |
1672 | { | |
1673 | } | |
1674 | ||
166c6370 BH |
1675 | struct pci_bus *pci_create_root_bus(struct device *parent, int bus, |
1676 | struct pci_ops *ops, void *sysdata, struct list_head *resources) | |
1da177e4 | 1677 | { |
0efd5aab | 1678 | int error; |
5a21d70d | 1679 | struct pci_host_bridge *bridge; |
0207c356 | 1680 | struct pci_bus *b, *b2; |
0efd5aab | 1681 | struct pci_host_bridge_window *window, *n; |
a9d9f527 | 1682 | struct resource *res; |
0efd5aab BH |
1683 | resource_size_t offset; |
1684 | char bus_addr[64]; | |
1685 | char *fmt; | |
1da177e4 LT |
1686 | |
1687 | b = pci_alloc_bus(); | |
1688 | if (!b) | |
7b543663 | 1689 | return NULL; |
1da177e4 LT |
1690 | |
1691 | b->sysdata = sysdata; | |
1692 | b->ops = ops; | |
4f535093 | 1693 | b->number = b->busn_res.start = bus; |
0207c356 BH |
1694 | b2 = pci_find_bus(pci_domain_nr(b), bus); |
1695 | if (b2) { | |
1da177e4 | 1696 | /* If we already got to this bus through a different bridge, ignore it */ |
0207c356 | 1697 | dev_dbg(&b2->dev, "bus already known\n"); |
1da177e4 LT |
1698 | goto err_out; |
1699 | } | |
d71374da | 1700 | |
7b543663 YL |
1701 | bridge = pci_alloc_host_bridge(b); |
1702 | if (!bridge) | |
1703 | goto err_out; | |
1704 | ||
1705 | bridge->dev.parent = parent; | |
1706 | bridge->dev.release = pci_release_bus_bridge_dev; | |
1707 | dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); | |
6c0cc950 | 1708 | error = pcibios_root_bridge_prepare(bridge); |
65a1fb23 JL |
1709 | if (error) { |
1710 | kfree(bridge); | |
1711 | goto err_out; | |
1712 | } | |
6c0cc950 | 1713 | |
7b543663 | 1714 | error = device_register(&bridge->dev); |
65a1fb23 JL |
1715 | if (error) { |
1716 | put_device(&bridge->dev); | |
1717 | goto err_out; | |
1718 | } | |
7b543663 | 1719 | b->bridge = get_device(&bridge->dev); |
a1e4d72c | 1720 | device_enable_async_suspend(b->bridge); |
98d9f30c | 1721 | pci_set_bus_of_node(b); |
1da177e4 | 1722 | |
0d358f22 YL |
1723 | if (!parent) |
1724 | set_dev_node(b->bridge, pcibus_to_node(b)); | |
1725 | ||
fd7d1ced GKH |
1726 | b->dev.class = &pcibus_class; |
1727 | b->dev.parent = b->bridge; | |
1a927133 | 1728 | dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); |
fd7d1ced | 1729 | error = device_register(&b->dev); |
1da177e4 LT |
1730 | if (error) |
1731 | goto class_dev_reg_err; | |
1da177e4 | 1732 | |
10a95747 JL |
1733 | pcibios_add_bus(b); |
1734 | ||
1da177e4 LT |
1735 | /* Create legacy_io and legacy_mem files for this bus */ |
1736 | pci_create_legacy_files(b); | |
1737 | ||
a9d9f527 BH |
1738 | if (parent) |
1739 | dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); | |
1740 | else | |
1741 | printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); | |
1742 | ||
0efd5aab BH |
1743 | /* Add initial resources to the bus */ |
1744 | list_for_each_entry_safe(window, n, resources, list) { | |
1745 | list_move_tail(&window->list, &bridge->windows); | |
1746 | res = window->res; | |
1747 | offset = window->offset; | |
f848ffb1 YL |
1748 | if (res->flags & IORESOURCE_BUS) |
1749 | pci_bus_insert_busn_res(b, bus, res->end); | |
1750 | else | |
1751 | pci_bus_add_resource(b, res, 0); | |
0efd5aab BH |
1752 | if (offset) { |
1753 | if (resource_type(res) == IORESOURCE_IO) | |
1754 | fmt = " (bus address [%#06llx-%#06llx])"; | |
1755 | else | |
1756 | fmt = " (bus address [%#010llx-%#010llx])"; | |
1757 | snprintf(bus_addr, sizeof(bus_addr), fmt, | |
1758 | (unsigned long long) (res->start - offset), | |
1759 | (unsigned long long) (res->end - offset)); | |
1760 | } else | |
1761 | bus_addr[0] = '\0'; | |
1762 | dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr); | |
a9d9f527 BH |
1763 | } |
1764 | ||
a5390aa6 BH |
1765 | down_write(&pci_bus_sem); |
1766 | list_add_tail(&b->node, &pci_root_buses); | |
1767 | up_write(&pci_bus_sem); | |
1768 | ||
1da177e4 LT |
1769 | return b; |
1770 | ||
1da177e4 | 1771 | class_dev_reg_err: |
7b543663 YL |
1772 | put_device(&bridge->dev); |
1773 | device_unregister(&bridge->dev); | |
1da177e4 | 1774 | err_out: |
1da177e4 LT |
1775 | kfree(b); |
1776 | return NULL; | |
1777 | } | |
cdb9b9f7 | 1778 | |
98a35831 YL |
1779 | int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) |
1780 | { | |
1781 | struct resource *res = &b->busn_res; | |
1782 | struct resource *parent_res, *conflict; | |
1783 | ||
1784 | res->start = bus; | |
1785 | res->end = bus_max; | |
1786 | res->flags = IORESOURCE_BUS; | |
1787 | ||
1788 | if (!pci_is_root_bus(b)) | |
1789 | parent_res = &b->parent->busn_res; | |
1790 | else { | |
1791 | parent_res = get_pci_domain_busn_res(pci_domain_nr(b)); | |
1792 | res->flags |= IORESOURCE_PCI_FIXED; | |
1793 | } | |
1794 | ||
1795 | conflict = insert_resource_conflict(parent_res, res); | |
1796 | ||
1797 | if (conflict) | |
1798 | dev_printk(KERN_DEBUG, &b->dev, | |
1799 | "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n", | |
1800 | res, pci_is_root_bus(b) ? "domain " : "", | |
1801 | parent_res, conflict->name, conflict); | |
98a35831 YL |
1802 | |
1803 | return conflict == NULL; | |
1804 | } | |
1805 | ||
1806 | int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max) | |
1807 | { | |
1808 | struct resource *res = &b->busn_res; | |
1809 | struct resource old_res = *res; | |
1810 | resource_size_t size; | |
1811 | int ret; | |
1812 | ||
1813 | if (res->start > bus_max) | |
1814 | return -EINVAL; | |
1815 | ||
1816 | size = bus_max - res->start + 1; | |
1817 | ret = adjust_resource(res, res->start, size); | |
1818 | dev_printk(KERN_DEBUG, &b->dev, | |
1819 | "busn_res: %pR end %s updated to %02x\n", | |
1820 | &old_res, ret ? "can not be" : "is", bus_max); | |
1821 | ||
1822 | if (!ret && !res->parent) | |
1823 | pci_bus_insert_busn_res(b, res->start, res->end); | |
1824 | ||
1825 | return ret; | |
1826 | } | |
1827 | ||
1828 | void pci_bus_release_busn_res(struct pci_bus *b) | |
1829 | { | |
1830 | struct resource *res = &b->busn_res; | |
1831 | int ret; | |
1832 | ||
1833 | if (!res->flags || !res->parent) | |
1834 | return; | |
1835 | ||
1836 | ret = release_resource(res); | |
1837 | dev_printk(KERN_DEBUG, &b->dev, | |
1838 | "busn_res: %pR %s released\n", | |
1839 | res, ret ? "can not be" : "is"); | |
1840 | } | |
1841 | ||
15856ad5 | 1842 | struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, |
a2ebb827 BH |
1843 | struct pci_ops *ops, void *sysdata, struct list_head *resources) |
1844 | { | |
4d99f524 YL |
1845 | struct pci_host_bridge_window *window; |
1846 | bool found = false; | |
a2ebb827 | 1847 | struct pci_bus *b; |
4d99f524 YL |
1848 | int max; |
1849 | ||
1850 | list_for_each_entry(window, resources, list) | |
1851 | if (window->res->flags & IORESOURCE_BUS) { | |
1852 | found = true; | |
1853 | break; | |
1854 | } | |
a2ebb827 BH |
1855 | |
1856 | b = pci_create_root_bus(parent, bus, ops, sysdata, resources); | |
1857 | if (!b) | |
1858 | return NULL; | |
1859 | ||
4d99f524 YL |
1860 | if (!found) { |
1861 | dev_info(&b->dev, | |
1862 | "No busn resource found for root bus, will use [bus %02x-ff]\n", | |
1863 | bus); | |
1864 | pci_bus_insert_busn_res(b, bus, 255); | |
1865 | } | |
1866 | ||
1867 | max = pci_scan_child_bus(b); | |
1868 | ||
1869 | if (!found) | |
1870 | pci_bus_update_busn_res_end(b, max); | |
1871 | ||
a2ebb827 BH |
1872 | pci_bus_add_devices(b); |
1873 | return b; | |
1874 | } | |
1875 | EXPORT_SYMBOL(pci_scan_root_bus); | |
1876 | ||
7e00fe2e | 1877 | /* Deprecated; use pci_scan_root_bus() instead */ |
15856ad5 | 1878 | struct pci_bus *pci_scan_bus_parented(struct device *parent, |
cdb9b9f7 PM |
1879 | int bus, struct pci_ops *ops, void *sysdata) |
1880 | { | |
1e39ae9f | 1881 | LIST_HEAD(resources); |
cdb9b9f7 PM |
1882 | struct pci_bus *b; |
1883 | ||
1e39ae9f BH |
1884 | pci_add_resource(&resources, &ioport_resource); |
1885 | pci_add_resource(&resources, &iomem_resource); | |
857c3b66 | 1886 | pci_add_resource(&resources, &busn_resource); |
1e39ae9f | 1887 | b = pci_create_root_bus(parent, bus, ops, sysdata, &resources); |
cdb9b9f7 | 1888 | if (b) |
857c3b66 | 1889 | pci_scan_child_bus(b); |
1e39ae9f BH |
1890 | else |
1891 | pci_free_resource_list(&resources); | |
cdb9b9f7 PM |
1892 | return b; |
1893 | } | |
1da177e4 LT |
1894 | EXPORT_SYMBOL(pci_scan_bus_parented); |
1895 | ||
15856ad5 | 1896 | struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, |
de4b2f76 BH |
1897 | void *sysdata) |
1898 | { | |
1899 | LIST_HEAD(resources); | |
1900 | struct pci_bus *b; | |
1901 | ||
1902 | pci_add_resource(&resources, &ioport_resource); | |
1903 | pci_add_resource(&resources, &iomem_resource); | |
857c3b66 | 1904 | pci_add_resource(&resources, &busn_resource); |
de4b2f76 BH |
1905 | b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources); |
1906 | if (b) { | |
857c3b66 | 1907 | pci_scan_child_bus(b); |
de4b2f76 BH |
1908 | pci_bus_add_devices(b); |
1909 | } else { | |
1910 | pci_free_resource_list(&resources); | |
1911 | } | |
1912 | return b; | |
1913 | } | |
1914 | EXPORT_SYMBOL(pci_scan_bus); | |
1915 | ||
2f320521 YL |
1916 | /** |
1917 | * pci_rescan_bus_bridge_resize - scan a PCI bus for devices. | |
1918 | * @bridge: PCI bridge for the bus to scan | |
1919 | * | |
1920 | * Scan a PCI bus and child buses for new devices, add them, | |
1921 | * and enable them, resizing bridge mmio/io resource if necessary | |
1922 | * and possible. The caller must ensure the child devices are already | |
1923 | * removed for resizing to occur. | |
1924 | * | |
1925 | * Returns the max number of subordinate bus discovered. | |
1926 | */ | |
1927 | unsigned int __ref pci_rescan_bus_bridge_resize(struct pci_dev *bridge) | |
1928 | { | |
1929 | unsigned int max; | |
1930 | struct pci_bus *bus = bridge->subordinate; | |
1931 | ||
1932 | max = pci_scan_child_bus(bus); | |
1933 | ||
1934 | pci_assign_unassigned_bridge_resources(bridge); | |
1935 | ||
1936 | pci_bus_add_devices(bus); | |
1937 | ||
1938 | return max; | |
1939 | } | |
1940 | ||
a5213a31 YL |
1941 | /** |
1942 | * pci_rescan_bus - scan a PCI bus for devices. | |
1943 | * @bus: PCI bus to scan | |
1944 | * | |
1945 | * Scan a PCI bus and child buses for new devices, adds them, | |
1946 | * and enables them. | |
1947 | * | |
1948 | * Returns the max number of subordinate bus discovered. | |
1949 | */ | |
1950 | unsigned int __ref pci_rescan_bus(struct pci_bus *bus) | |
1951 | { | |
1952 | unsigned int max; | |
1953 | ||
1954 | max = pci_scan_child_bus(bus); | |
1955 | pci_assign_unassigned_bus_resources(bus); | |
e164f658 | 1956 | pci_enable_bridges(bus); |
a5213a31 YL |
1957 | pci_bus_add_devices(bus); |
1958 | ||
1959 | return max; | |
1960 | } | |
1961 | EXPORT_SYMBOL_GPL(pci_rescan_bus); | |
1962 | ||
1da177e4 | 1963 | EXPORT_SYMBOL(pci_add_new_bus); |
1da177e4 LT |
1964 | EXPORT_SYMBOL(pci_scan_slot); |
1965 | EXPORT_SYMBOL(pci_scan_bridge); | |
1da177e4 | 1966 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
6b4b78fe | 1967 | |
99178b03 | 1968 | static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b) |
6b4b78fe | 1969 | { |
99178b03 GKH |
1970 | const struct pci_dev *a = to_pci_dev(d_a); |
1971 | const struct pci_dev *b = to_pci_dev(d_b); | |
1972 | ||
6b4b78fe MD |
1973 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; |
1974 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; | |
1975 | ||
1976 | if (a->bus->number < b->bus->number) return -1; | |
1977 | else if (a->bus->number > b->bus->number) return 1; | |
1978 | ||
1979 | if (a->devfn < b->devfn) return -1; | |
1980 | else if (a->devfn > b->devfn) return 1; | |
1981 | ||
1982 | return 0; | |
1983 | } | |
1984 | ||
5ff580c1 | 1985 | void __init pci_sort_breadthfirst(void) |
6b4b78fe | 1986 | { |
99178b03 | 1987 | bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); |
6b4b78fe | 1988 | } |