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> | |
50230713 | 9 | #include <linux/of_device.h> |
de335bb4 | 10 | #include <linux/of_pci.h> |
589fcc23 | 11 | #include <linux/pci_hotplug.h> |
1da177e4 LT |
12 | #include <linux/slab.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/cpumask.h> | |
7d715a6c | 15 | #include <linux/pci-aspm.h> |
284f5f9d | 16 | #include <asm-generic/pci-bridge.h> |
bc56b9e0 | 17 | #include "pci.h" |
1da177e4 LT |
18 | |
19 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ | |
20 | #define CARDBUS_RESERVE_BUSNR 3 | |
1da177e4 | 21 | |
0b950f0f | 22 | static struct resource busn_resource = { |
67cdc827 YL |
23 | .name = "PCI busn", |
24 | .start = 0, | |
25 | .end = 255, | |
26 | .flags = IORESOURCE_BUS, | |
27 | }; | |
28 | ||
1da177e4 LT |
29 | /* Ugh. Need to stop exporting this to modules. */ |
30 | LIST_HEAD(pci_root_buses); | |
31 | EXPORT_SYMBOL(pci_root_buses); | |
32 | ||
5cc62c20 YL |
33 | static LIST_HEAD(pci_domain_busn_res_list); |
34 | ||
35 | struct pci_domain_busn_res { | |
36 | struct list_head list; | |
37 | struct resource res; | |
38 | int domain_nr; | |
39 | }; | |
40 | ||
41 | static struct resource *get_pci_domain_busn_res(int domain_nr) | |
42 | { | |
43 | struct pci_domain_busn_res *r; | |
44 | ||
45 | list_for_each_entry(r, &pci_domain_busn_res_list, list) | |
46 | if (r->domain_nr == domain_nr) | |
47 | return &r->res; | |
48 | ||
49 | r = kzalloc(sizeof(*r), GFP_KERNEL); | |
50 | if (!r) | |
51 | return NULL; | |
52 | ||
53 | r->domain_nr = domain_nr; | |
54 | r->res.start = 0; | |
55 | r->res.end = 0xff; | |
56 | r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED; | |
57 | ||
58 | list_add_tail(&r->list, &pci_domain_busn_res_list); | |
59 | ||
60 | return &r->res; | |
61 | } | |
62 | ||
70308923 GKH |
63 | static int find_anything(struct device *dev, void *data) |
64 | { | |
65 | return 1; | |
66 | } | |
1da177e4 | 67 | |
ed4aaadb ZY |
68 | /* |
69 | * Some device drivers need know if pci is initiated. | |
70 | * Basically, we think pci is not initiated when there | |
70308923 | 71 | * is no device to be found on the pci_bus_type. |
ed4aaadb ZY |
72 | */ |
73 | int no_pci_devices(void) | |
74 | { | |
70308923 GKH |
75 | struct device *dev; |
76 | int no_devices; | |
ed4aaadb | 77 | |
70308923 GKH |
78 | dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); |
79 | no_devices = (dev == NULL); | |
80 | put_device(dev); | |
81 | return no_devices; | |
82 | } | |
ed4aaadb ZY |
83 | EXPORT_SYMBOL(no_pci_devices); |
84 | ||
1da177e4 LT |
85 | /* |
86 | * PCI Bus Class | |
87 | */ | |
fd7d1ced | 88 | static void release_pcibus_dev(struct device *dev) |
1da177e4 | 89 | { |
fd7d1ced | 90 | struct pci_bus *pci_bus = to_pci_bus(dev); |
1da177e4 | 91 | |
ff0387c3 | 92 | put_device(pci_bus->bridge); |
2fe2abf8 | 93 | pci_bus_remove_resources(pci_bus); |
98d9f30c | 94 | pci_release_bus_of_node(pci_bus); |
1da177e4 LT |
95 | kfree(pci_bus); |
96 | } | |
97 | ||
98 | static struct class pcibus_class = { | |
99 | .name = "pci_bus", | |
fd7d1ced | 100 | .dev_release = &release_pcibus_dev, |
56039e65 | 101 | .dev_groups = pcibus_groups, |
1da177e4 LT |
102 | }; |
103 | ||
104 | static int __init pcibus_class_init(void) | |
105 | { | |
106 | return class_register(&pcibus_class); | |
107 | } | |
108 | postcore_initcall(pcibus_class_init); | |
109 | ||
6ac665c6 | 110 | static u64 pci_size(u64 base, u64 maxbase, u64 mask) |
1da177e4 | 111 | { |
6ac665c6 | 112 | u64 size = mask & maxbase; /* Find the significant bits */ |
1da177e4 LT |
113 | if (!size) |
114 | return 0; | |
115 | ||
116 | /* Get the lowest of them to find the decode size, and | |
117 | from that the extent. */ | |
118 | size = (size & ~(size-1)) - 1; | |
119 | ||
120 | /* base == maxbase can be valid only if the BAR has | |
121 | already been programmed with all 1s. */ | |
122 | if (base == maxbase && ((base | size) & mask) != mask) | |
123 | return 0; | |
124 | ||
125 | return size; | |
126 | } | |
127 | ||
28c6821a | 128 | static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar) |
6ac665c6 | 129 | { |
8d6a6a47 | 130 | u32 mem_type; |
28c6821a | 131 | unsigned long flags; |
8d6a6a47 | 132 | |
6ac665c6 | 133 | if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { |
28c6821a BH |
134 | flags = bar & ~PCI_BASE_ADDRESS_IO_MASK; |
135 | flags |= IORESOURCE_IO; | |
136 | return flags; | |
6ac665c6 | 137 | } |
07eddf3d | 138 | |
28c6821a BH |
139 | flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK; |
140 | flags |= IORESOURCE_MEM; | |
141 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) | |
142 | flags |= IORESOURCE_PREFETCH; | |
07eddf3d | 143 | |
8d6a6a47 BH |
144 | mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK; |
145 | switch (mem_type) { | |
146 | case PCI_BASE_ADDRESS_MEM_TYPE_32: | |
147 | break; | |
148 | case PCI_BASE_ADDRESS_MEM_TYPE_1M: | |
0ff9514b | 149 | /* 1M mem BAR treated as 32-bit BAR */ |
8d6a6a47 BH |
150 | break; |
151 | case PCI_BASE_ADDRESS_MEM_TYPE_64: | |
28c6821a BH |
152 | flags |= IORESOURCE_MEM_64; |
153 | break; | |
8d6a6a47 | 154 | default: |
0ff9514b | 155 | /* mem unknown type treated as 32-bit BAR */ |
8d6a6a47 BH |
156 | break; |
157 | } | |
28c6821a | 158 | return flags; |
07eddf3d YL |
159 | } |
160 | ||
808e34e2 ZK |
161 | #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO) |
162 | ||
0b400c7e YZ |
163 | /** |
164 | * pci_read_base - read a PCI BAR | |
165 | * @dev: the PCI device | |
166 | * @type: type of the BAR | |
167 | * @res: resource buffer to be filled in | |
168 | * @pos: BAR position in the config space | |
169 | * | |
170 | * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. | |
6ac665c6 | 171 | */ |
0b400c7e | 172 | int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, |
3c78bc61 | 173 | struct resource *res, unsigned int pos) |
07eddf3d | 174 | { |
6ac665c6 | 175 | u32 l, sz, mask; |
23b13bc7 | 176 | u64 l64, sz64, mask64; |
253d2e54 | 177 | u16 orig_cmd; |
cf4d1cf5 | 178 | struct pci_bus_region region, inverted_region; |
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 | */ |
f795d86a MS |
204 | if (sz == 0xffffffff) |
205 | sz = 0; | |
6ac665c6 MW |
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) { | |
f795d86a MS |
218 | l64 = l & PCI_BASE_ADDRESS_IO_MASK; |
219 | sz64 = sz & PCI_BASE_ADDRESS_IO_MASK; | |
220 | mask64 = PCI_BASE_ADDRESS_IO_MASK & (u32)IO_SPACE_LIMIT; | |
6ac665c6 | 221 | } else { |
f795d86a MS |
222 | l64 = l & PCI_BASE_ADDRESS_MEM_MASK; |
223 | sz64 = sz & PCI_BASE_ADDRESS_MEM_MASK; | |
224 | mask64 = (u32)PCI_BASE_ADDRESS_MEM_MASK; | |
6ac665c6 MW |
225 | } |
226 | } else { | |
227 | res->flags |= (l & IORESOURCE_ROM_ENABLE); | |
f795d86a MS |
228 | l64 = l & PCI_ROM_ADDRESS_MASK; |
229 | sz64 = sz & PCI_ROM_ADDRESS_MASK; | |
230 | mask64 = (u32)PCI_ROM_ADDRESS_MASK; | |
6ac665c6 MW |
231 | } |
232 | ||
28c6821a | 233 | if (res->flags & IORESOURCE_MEM_64) { |
6ac665c6 MW |
234 | pci_read_config_dword(dev, pos + 4, &l); |
235 | pci_write_config_dword(dev, pos + 4, ~0); | |
236 | pci_read_config_dword(dev, pos + 4, &sz); | |
237 | pci_write_config_dword(dev, pos + 4, l); | |
238 | ||
239 | l64 |= ((u64)l << 32); | |
240 | sz64 |= ((u64)sz << 32); | |
f795d86a MS |
241 | mask64 |= ((u64)~0 << 32); |
242 | } | |
6ac665c6 | 243 | |
f795d86a MS |
244 | if (!dev->mmio_always_on && (orig_cmd & PCI_COMMAND_DECODE_ENABLE)) |
245 | pci_write_config_word(dev, PCI_COMMAND, orig_cmd); | |
6ac665c6 | 246 | |
f795d86a MS |
247 | if (!sz64) |
248 | goto fail; | |
6ac665c6 | 249 | |
f795d86a | 250 | sz64 = pci_size(l64, sz64, mask64); |
7e79c5f8 MS |
251 | if (!sz64) { |
252 | dev_info(&dev->dev, FW_BUG "reg 0x%x: invalid BAR (can't size)\n", | |
253 | pos); | |
f795d86a | 254 | goto fail; |
7e79c5f8 | 255 | } |
f795d86a MS |
256 | |
257 | if (res->flags & IORESOURCE_MEM_64) { | |
3a9ad0b4 YL |
258 | if ((sizeof(pci_bus_addr_t) < 8 || sizeof(resource_size_t) < 8) |
259 | && sz64 > 0x100000000ULL) { | |
23b13bc7 BH |
260 | res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED; |
261 | res->start = 0; | |
262 | res->end = 0; | |
f795d86a MS |
263 | dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n", |
264 | pos, (unsigned long long)sz64); | |
23b13bc7 | 265 | goto out; |
c7dabef8 BH |
266 | } |
267 | ||
3a9ad0b4 | 268 | if ((sizeof(pci_bus_addr_t) < 8) && l) { |
31e9dd25 | 269 | /* Above 32-bit boundary; try to reallocate */ |
c83bd900 | 270 | res->flags |= IORESOURCE_UNSET; |
72dc5601 BH |
271 | res->start = 0; |
272 | res->end = sz64; | |
f795d86a MS |
273 | dev_info(&dev->dev, "reg 0x%x: can't handle BAR above 4GB (bus address %#010llx)\n", |
274 | pos, (unsigned long long)l64); | |
72dc5601 | 275 | goto out; |
6ac665c6 | 276 | } |
6ac665c6 MW |
277 | } |
278 | ||
f795d86a MS |
279 | region.start = l64; |
280 | region.end = l64 + sz64; | |
281 | ||
fc279850 YL |
282 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
283 | pcibios_resource_to_bus(dev->bus, &inverted_region, res); | |
cf4d1cf5 KH |
284 | |
285 | /* | |
286 | * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is | |
287 | * the corresponding resource address (the physical address used by | |
288 | * the CPU. Converting that resource address back to a bus address | |
289 | * should yield the original BAR value: | |
290 | * | |
291 | * resource_to_bus(bus_to_resource(A)) == A | |
292 | * | |
293 | * If it doesn't, CPU accesses to "bus_to_resource(A)" will not | |
294 | * be claimed by the device. | |
295 | */ | |
296 | if (inverted_region.start != region.start) { | |
cf4d1cf5 | 297 | res->flags |= IORESOURCE_UNSET; |
cf4d1cf5 | 298 | res->start = 0; |
26370fc6 | 299 | res->end = region.end - region.start; |
f795d86a MS |
300 | dev_info(&dev->dev, "reg 0x%x: initial BAR value %#010llx invalid\n", |
301 | pos, (unsigned long long)region.start); | |
cf4d1cf5 | 302 | } |
96ddef25 | 303 | |
0ff9514b BH |
304 | goto out; |
305 | ||
306 | ||
307 | fail: | |
308 | res->flags = 0; | |
309 | out: | |
31e9dd25 | 310 | if (res->flags) |
33963e30 | 311 | dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res); |
0ff9514b | 312 | |
28c6821a | 313 | return (res->flags & IORESOURCE_MEM_64) ? 1 : 0; |
07eddf3d YL |
314 | } |
315 | ||
1da177e4 LT |
316 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
317 | { | |
6ac665c6 | 318 | unsigned int pos, reg; |
07eddf3d | 319 | |
6ac665c6 MW |
320 | for (pos = 0; pos < howmany; pos++) { |
321 | struct resource *res = &dev->resource[pos]; | |
1da177e4 | 322 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); |
6ac665c6 | 323 | pos += __pci_read_base(dev, pci_bar_unknown, res, reg); |
1da177e4 | 324 | } |
6ac665c6 | 325 | |
1da177e4 | 326 | if (rom) { |
6ac665c6 | 327 | struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; |
1da177e4 | 328 | dev->rom_base_reg = rom; |
6ac665c6 | 329 | res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | |
92b19ff5 | 330 | IORESOURCE_READONLY | IORESOURCE_SIZEALIGN; |
6ac665c6 | 331 | __pci_read_base(dev, pci_bar_mem32, res, rom); |
1da177e4 LT |
332 | } |
333 | } | |
334 | ||
15856ad5 | 335 | static void pci_read_bridge_io(struct pci_bus *child) |
1da177e4 LT |
336 | { |
337 | struct pci_dev *dev = child->self; | |
338 | u8 io_base_lo, io_limit_lo; | |
2b28ae19 | 339 | unsigned long io_mask, io_granularity, base, limit; |
5bfa14ed | 340 | struct pci_bus_region region; |
2b28ae19 BH |
341 | struct resource *res; |
342 | ||
343 | io_mask = PCI_IO_RANGE_MASK; | |
344 | io_granularity = 0x1000; | |
345 | if (dev->io_window_1k) { | |
346 | /* Support 1K I/O space granularity */ | |
347 | io_mask = PCI_IO_1K_RANGE_MASK; | |
348 | io_granularity = 0x400; | |
349 | } | |
1da177e4 | 350 | |
1da177e4 LT |
351 | res = child->resource[0]; |
352 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); | |
353 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); | |
2b28ae19 BH |
354 | base = (io_base_lo & io_mask) << 8; |
355 | limit = (io_limit_lo & io_mask) << 8; | |
1da177e4 LT |
356 | |
357 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { | |
358 | u16 io_base_hi, io_limit_hi; | |
8f38eaca | 359 | |
1da177e4 LT |
360 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); |
361 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); | |
8f38eaca BH |
362 | base |= ((unsigned long) io_base_hi << 16); |
363 | limit |= ((unsigned long) io_limit_hi << 16); | |
1da177e4 LT |
364 | } |
365 | ||
5dde383e | 366 | if (base <= limit) { |
1da177e4 | 367 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; |
5bfa14ed | 368 | region.start = base; |
2b28ae19 | 369 | region.end = limit + io_granularity - 1; |
fc279850 | 370 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
c7dabef8 | 371 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 | 372 | } |
fa27b2d1 BH |
373 | } |
374 | ||
15856ad5 | 375 | static void pci_read_bridge_mmio(struct pci_bus *child) |
fa27b2d1 BH |
376 | { |
377 | struct pci_dev *dev = child->self; | |
378 | u16 mem_base_lo, mem_limit_lo; | |
379 | unsigned long base, limit; | |
5bfa14ed | 380 | struct pci_bus_region region; |
fa27b2d1 | 381 | struct resource *res; |
1da177e4 LT |
382 | |
383 | res = child->resource[1]; | |
384 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); | |
385 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); | |
8f38eaca BH |
386 | base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; |
387 | limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; | |
5dde383e | 388 | if (base <= limit) { |
1da177e4 | 389 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; |
5bfa14ed BH |
390 | region.start = base; |
391 | region.end = limit + 0xfffff; | |
fc279850 | 392 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
c7dabef8 | 393 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 | 394 | } |
fa27b2d1 BH |
395 | } |
396 | ||
15856ad5 | 397 | static void pci_read_bridge_mmio_pref(struct pci_bus *child) |
fa27b2d1 BH |
398 | { |
399 | struct pci_dev *dev = child->self; | |
400 | u16 mem_base_lo, mem_limit_lo; | |
7fc986d8 | 401 | u64 base64, limit64; |
3a9ad0b4 | 402 | pci_bus_addr_t base, limit; |
5bfa14ed | 403 | struct pci_bus_region region; |
fa27b2d1 | 404 | struct resource *res; |
1da177e4 LT |
405 | |
406 | res = child->resource[2]; | |
407 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); | |
408 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); | |
7fc986d8 YL |
409 | base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; |
410 | limit64 = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; | |
1da177e4 LT |
411 | |
412 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { | |
413 | u32 mem_base_hi, mem_limit_hi; | |
8f38eaca | 414 | |
1da177e4 LT |
415 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); |
416 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); | |
417 | ||
418 | /* | |
419 | * Some bridges set the base > limit by default, and some | |
420 | * (broken) BIOSes do not initialize them. If we find | |
421 | * this, just assume they are not being used. | |
422 | */ | |
423 | if (mem_base_hi <= mem_limit_hi) { | |
7fc986d8 YL |
424 | base64 |= (u64) mem_base_hi << 32; |
425 | limit64 |= (u64) mem_limit_hi << 32; | |
1da177e4 LT |
426 | } |
427 | } | |
7fc986d8 | 428 | |
3a9ad0b4 YL |
429 | base = (pci_bus_addr_t) base64; |
430 | limit = (pci_bus_addr_t) limit64; | |
7fc986d8 YL |
431 | |
432 | if (base != base64) { | |
433 | dev_err(&dev->dev, "can't handle bridge window above 4GB (bus address %#010llx)\n", | |
434 | (unsigned long long) base64); | |
435 | return; | |
436 | } | |
437 | ||
5dde383e | 438 | if (base <= limit) { |
1f82de10 YL |
439 | res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | |
440 | IORESOURCE_MEM | IORESOURCE_PREFETCH; | |
441 | if (res->flags & PCI_PREF_RANGE_TYPE_64) | |
442 | res->flags |= IORESOURCE_MEM_64; | |
5bfa14ed BH |
443 | region.start = base; |
444 | region.end = limit + 0xfffff; | |
fc279850 | 445 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
c7dabef8 | 446 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
1da177e4 LT |
447 | } |
448 | } | |
449 | ||
15856ad5 | 450 | void pci_read_bridge_bases(struct pci_bus *child) |
fa27b2d1 BH |
451 | { |
452 | struct pci_dev *dev = child->self; | |
2fe2abf8 | 453 | struct resource *res; |
fa27b2d1 BH |
454 | int i; |
455 | ||
456 | if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ | |
457 | return; | |
458 | ||
b918c62e YL |
459 | dev_info(&dev->dev, "PCI bridge to %pR%s\n", |
460 | &child->busn_res, | |
fa27b2d1 BH |
461 | dev->transparent ? " (subtractive decode)" : ""); |
462 | ||
2fe2abf8 BH |
463 | pci_bus_remove_resources(child); |
464 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) | |
465 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; | |
466 | ||
fa27b2d1 BH |
467 | pci_read_bridge_io(child); |
468 | pci_read_bridge_mmio(child); | |
469 | pci_read_bridge_mmio_pref(child); | |
2adf7516 BH |
470 | |
471 | if (dev->transparent) { | |
2fe2abf8 | 472 | pci_bus_for_each_resource(child->parent, res, i) { |
d739a099 | 473 | if (res && res->flags) { |
2fe2abf8 BH |
474 | pci_bus_add_resource(child, res, |
475 | PCI_SUBTRACTIVE_DECODE); | |
2adf7516 BH |
476 | dev_printk(KERN_DEBUG, &dev->dev, |
477 | " bridge window %pR (subtractive decode)\n", | |
2fe2abf8 BH |
478 | res); |
479 | } | |
2adf7516 BH |
480 | } |
481 | } | |
fa27b2d1 BH |
482 | } |
483 | ||
670ba0c8 | 484 | static struct pci_bus *pci_alloc_bus(struct pci_bus *parent) |
1da177e4 LT |
485 | { |
486 | struct pci_bus *b; | |
487 | ||
f5afe806 | 488 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
05013486 BH |
489 | if (!b) |
490 | return NULL; | |
491 | ||
492 | INIT_LIST_HEAD(&b->node); | |
493 | INIT_LIST_HEAD(&b->children); | |
494 | INIT_LIST_HEAD(&b->devices); | |
495 | INIT_LIST_HEAD(&b->slots); | |
496 | INIT_LIST_HEAD(&b->resources); | |
497 | b->max_bus_speed = PCI_SPEED_UNKNOWN; | |
498 | b->cur_bus_speed = PCI_SPEED_UNKNOWN; | |
670ba0c8 CM |
499 | #ifdef CONFIG_PCI_DOMAINS_GENERIC |
500 | if (parent) | |
501 | b->domain_nr = parent->domain_nr; | |
502 | #endif | |
1da177e4 LT |
503 | return b; |
504 | } | |
505 | ||
70efde2a JL |
506 | static void pci_release_host_bridge_dev(struct device *dev) |
507 | { | |
508 | struct pci_host_bridge *bridge = to_pci_host_bridge(dev); | |
509 | ||
510 | if (bridge->release_fn) | |
511 | bridge->release_fn(bridge); | |
512 | ||
513 | pci_free_resource_list(&bridge->windows); | |
514 | ||
515 | kfree(bridge); | |
516 | } | |
517 | ||
7b543663 YL |
518 | static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) |
519 | { | |
520 | struct pci_host_bridge *bridge; | |
521 | ||
522 | bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); | |
05013486 BH |
523 | if (!bridge) |
524 | return NULL; | |
7b543663 | 525 | |
05013486 BH |
526 | INIT_LIST_HEAD(&bridge->windows); |
527 | bridge->bus = b; | |
7b543663 YL |
528 | return bridge; |
529 | } | |
530 | ||
0b950f0f | 531 | static const unsigned char pcix_bus_speed[] = { |
9be60ca0 MW |
532 | PCI_SPEED_UNKNOWN, /* 0 */ |
533 | PCI_SPEED_66MHz_PCIX, /* 1 */ | |
534 | PCI_SPEED_100MHz_PCIX, /* 2 */ | |
535 | PCI_SPEED_133MHz_PCIX, /* 3 */ | |
536 | PCI_SPEED_UNKNOWN, /* 4 */ | |
537 | PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ | |
538 | PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ | |
539 | PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ | |
540 | PCI_SPEED_UNKNOWN, /* 8 */ | |
541 | PCI_SPEED_66MHz_PCIX_266, /* 9 */ | |
542 | PCI_SPEED_100MHz_PCIX_266, /* A */ | |
543 | PCI_SPEED_133MHz_PCIX_266, /* B */ | |
544 | PCI_SPEED_UNKNOWN, /* C */ | |
545 | PCI_SPEED_66MHz_PCIX_533, /* D */ | |
546 | PCI_SPEED_100MHz_PCIX_533, /* E */ | |
547 | PCI_SPEED_133MHz_PCIX_533 /* F */ | |
548 | }; | |
549 | ||
343e51ae | 550 | const unsigned char pcie_link_speed[] = { |
3749c51a MW |
551 | PCI_SPEED_UNKNOWN, /* 0 */ |
552 | PCIE_SPEED_2_5GT, /* 1 */ | |
553 | PCIE_SPEED_5_0GT, /* 2 */ | |
9dfd97fe | 554 | PCIE_SPEED_8_0GT, /* 3 */ |
3749c51a MW |
555 | PCI_SPEED_UNKNOWN, /* 4 */ |
556 | PCI_SPEED_UNKNOWN, /* 5 */ | |
557 | PCI_SPEED_UNKNOWN, /* 6 */ | |
558 | PCI_SPEED_UNKNOWN, /* 7 */ | |
559 | PCI_SPEED_UNKNOWN, /* 8 */ | |
560 | PCI_SPEED_UNKNOWN, /* 9 */ | |
561 | PCI_SPEED_UNKNOWN, /* A */ | |
562 | PCI_SPEED_UNKNOWN, /* B */ | |
563 | PCI_SPEED_UNKNOWN, /* C */ | |
564 | PCI_SPEED_UNKNOWN, /* D */ | |
565 | PCI_SPEED_UNKNOWN, /* E */ | |
566 | PCI_SPEED_UNKNOWN /* F */ | |
567 | }; | |
568 | ||
569 | void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) | |
570 | { | |
231afea1 | 571 | bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS]; |
3749c51a MW |
572 | } |
573 | EXPORT_SYMBOL_GPL(pcie_update_link_speed); | |
574 | ||
45b4cdd5 MW |
575 | static unsigned char agp_speeds[] = { |
576 | AGP_UNKNOWN, | |
577 | AGP_1X, | |
578 | AGP_2X, | |
579 | AGP_4X, | |
580 | AGP_8X | |
581 | }; | |
582 | ||
583 | static enum pci_bus_speed agp_speed(int agp3, int agpstat) | |
584 | { | |
585 | int index = 0; | |
586 | ||
587 | if (agpstat & 4) | |
588 | index = 3; | |
589 | else if (agpstat & 2) | |
590 | index = 2; | |
591 | else if (agpstat & 1) | |
592 | index = 1; | |
593 | else | |
594 | goto out; | |
f7625980 | 595 | |
45b4cdd5 MW |
596 | if (agp3) { |
597 | index += 2; | |
598 | if (index == 5) | |
599 | index = 0; | |
600 | } | |
601 | ||
602 | out: | |
603 | return agp_speeds[index]; | |
604 | } | |
605 | ||
9be60ca0 MW |
606 | static void pci_set_bus_speed(struct pci_bus *bus) |
607 | { | |
608 | struct pci_dev *bridge = bus->self; | |
609 | int pos; | |
610 | ||
45b4cdd5 MW |
611 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); |
612 | if (!pos) | |
613 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); | |
614 | if (pos) { | |
615 | u32 agpstat, agpcmd; | |
616 | ||
617 | pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); | |
618 | bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); | |
619 | ||
620 | pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); | |
621 | bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); | |
622 | } | |
623 | ||
9be60ca0 MW |
624 | pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); |
625 | if (pos) { | |
626 | u16 status; | |
627 | enum pci_bus_speed max; | |
9be60ca0 | 628 | |
7793eeab BH |
629 | pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS, |
630 | &status); | |
631 | ||
632 | if (status & PCI_X_SSTATUS_533MHZ) { | |
9be60ca0 | 633 | max = PCI_SPEED_133MHz_PCIX_533; |
7793eeab | 634 | } else if (status & PCI_X_SSTATUS_266MHZ) { |
9be60ca0 | 635 | max = PCI_SPEED_133MHz_PCIX_266; |
7793eeab | 636 | } else if (status & PCI_X_SSTATUS_133MHZ) { |
3c78bc61 | 637 | if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) |
9be60ca0 | 638 | max = PCI_SPEED_133MHz_PCIX_ECC; |
3c78bc61 | 639 | else |
9be60ca0 | 640 | max = PCI_SPEED_133MHz_PCIX; |
9be60ca0 MW |
641 | } else { |
642 | max = PCI_SPEED_66MHz_PCIX; | |
643 | } | |
644 | ||
645 | bus->max_bus_speed = max; | |
7793eeab BH |
646 | bus->cur_bus_speed = pcix_bus_speed[ |
647 | (status & PCI_X_SSTATUS_FREQ) >> 6]; | |
9be60ca0 MW |
648 | |
649 | return; | |
650 | } | |
651 | ||
fdfe1511 | 652 | if (pci_is_pcie(bridge)) { |
9be60ca0 MW |
653 | u32 linkcap; |
654 | u16 linksta; | |
655 | ||
59875ae4 | 656 | pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap); |
231afea1 | 657 | bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS]; |
9be60ca0 | 658 | |
59875ae4 | 659 | pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta); |
9be60ca0 MW |
660 | pcie_update_link_speed(bus, linksta); |
661 | } | |
662 | } | |
663 | ||
44aa0c65 MZ |
664 | static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus) |
665 | { | |
b165e2b6 MZ |
666 | struct irq_domain *d; |
667 | ||
44aa0c65 MZ |
668 | /* |
669 | * Any firmware interface that can resolve the msi_domain | |
670 | * should be called from here. | |
671 | */ | |
b165e2b6 | 672 | d = pci_host_bridge_of_msi_domain(bus); |
44aa0c65 | 673 | |
b165e2b6 | 674 | return d; |
44aa0c65 MZ |
675 | } |
676 | ||
677 | static void pci_set_bus_msi_domain(struct pci_bus *bus) | |
678 | { | |
679 | struct irq_domain *d; | |
38ea72bd | 680 | struct pci_bus *b; |
44aa0c65 MZ |
681 | |
682 | /* | |
38ea72bd AW |
683 | * The bus can be a root bus, a subordinate bus, or a virtual bus |
684 | * created by an SR-IOV device. Walk up to the first bridge device | |
685 | * found or derive the domain from the host bridge. | |
44aa0c65 | 686 | */ |
38ea72bd AW |
687 | for (b = bus, d = NULL; !d && !pci_is_root_bus(b); b = b->parent) { |
688 | if (b->self) | |
689 | d = dev_get_msi_domain(&b->self->dev); | |
690 | } | |
691 | ||
692 | if (!d) | |
693 | d = pci_host_bridge_msi_domain(b); | |
44aa0c65 MZ |
694 | |
695 | dev_set_msi_domain(&bus->dev, d); | |
696 | } | |
697 | ||
cbd4e055 AB |
698 | static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, |
699 | struct pci_dev *bridge, int busnr) | |
1da177e4 LT |
700 | { |
701 | struct pci_bus *child; | |
702 | int i; | |
4f535093 | 703 | int ret; |
1da177e4 LT |
704 | |
705 | /* | |
706 | * Allocate a new bus, and inherit stuff from the parent.. | |
707 | */ | |
670ba0c8 | 708 | child = pci_alloc_bus(parent); |
1da177e4 LT |
709 | if (!child) |
710 | return NULL; | |
711 | ||
1da177e4 LT |
712 | child->parent = parent; |
713 | child->ops = parent->ops; | |
0cbdcfcf | 714 | child->msi = parent->msi; |
1da177e4 | 715 | child->sysdata = parent->sysdata; |
6e325a62 | 716 | child->bus_flags = parent->bus_flags; |
1da177e4 | 717 | |
fd7d1ced | 718 | /* initialize some portions of the bus device, but don't register it |
4f535093 | 719 | * now as the parent is not properly set up yet. |
fd7d1ced GKH |
720 | */ |
721 | child->dev.class = &pcibus_class; | |
1a927133 | 722 | dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); |
1da177e4 LT |
723 | |
724 | /* | |
725 | * Set up the primary, secondary and subordinate | |
726 | * bus numbers. | |
727 | */ | |
b918c62e YL |
728 | child->number = child->busn_res.start = busnr; |
729 | child->primary = parent->busn_res.start; | |
730 | child->busn_res.end = 0xff; | |
1da177e4 | 731 | |
4f535093 YL |
732 | if (!bridge) { |
733 | child->dev.parent = parent->bridge; | |
734 | goto add_dev; | |
735 | } | |
3789fa8a YZ |
736 | |
737 | child->self = bridge; | |
738 | child->bridge = get_device(&bridge->dev); | |
4f535093 | 739 | child->dev.parent = child->bridge; |
98d9f30c | 740 | pci_set_bus_of_node(child); |
9be60ca0 MW |
741 | pci_set_bus_speed(child); |
742 | ||
1da177e4 | 743 | /* Set up default resource pointers and names.. */ |
fde09c6d | 744 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { |
1da177e4 LT |
745 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; |
746 | child->resource[i]->name = child->name; | |
747 | } | |
748 | bridge->subordinate = child; | |
749 | ||
4f535093 | 750 | add_dev: |
44aa0c65 | 751 | pci_set_bus_msi_domain(child); |
4f535093 YL |
752 | ret = device_register(&child->dev); |
753 | WARN_ON(ret < 0); | |
754 | ||
10a95747 JL |
755 | pcibios_add_bus(child); |
756 | ||
4f535093 YL |
757 | /* Create legacy_io and legacy_mem files for this bus */ |
758 | pci_create_legacy_files(child); | |
759 | ||
1da177e4 LT |
760 | return child; |
761 | } | |
762 | ||
3c78bc61 RD |
763 | struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, |
764 | int busnr) | |
1da177e4 LT |
765 | { |
766 | struct pci_bus *child; | |
767 | ||
768 | child = pci_alloc_child_bus(parent, dev, busnr); | |
e4ea9bb7 | 769 | if (child) { |
d71374da | 770 | down_write(&pci_bus_sem); |
1da177e4 | 771 | list_add_tail(&child->node, &parent->children); |
d71374da | 772 | up_write(&pci_bus_sem); |
e4ea9bb7 | 773 | } |
1da177e4 LT |
774 | return child; |
775 | } | |
b7fe9434 | 776 | EXPORT_SYMBOL(pci_add_new_bus); |
1da177e4 | 777 | |
f3dbd802 RJ |
778 | static void pci_enable_crs(struct pci_dev *pdev) |
779 | { | |
780 | u16 root_cap = 0; | |
781 | ||
782 | /* Enable CRS Software Visibility if supported */ | |
783 | pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap); | |
784 | if (root_cap & PCI_EXP_RTCAP_CRSVIS) | |
785 | pcie_capability_set_word(pdev, PCI_EXP_RTCTL, | |
786 | PCI_EXP_RTCTL_CRSSVE); | |
787 | } | |
788 | ||
1da177e4 LT |
789 | /* |
790 | * If it's a bridge, configure it and scan the bus behind it. | |
791 | * For CardBus bridges, we don't scan behind as the devices will | |
792 | * be handled by the bridge driver itself. | |
793 | * | |
794 | * We need to process bridges in two passes -- first we scan those | |
795 | * already configured by the BIOS and after we are done with all of | |
796 | * them, we proceed to assigning numbers to the remaining buses in | |
797 | * order to avoid overlaps between old and new bus numbers. | |
798 | */ | |
15856ad5 | 799 | int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) |
1da177e4 LT |
800 | { |
801 | struct pci_bus *child; | |
802 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); | |
49887941 | 803 | u32 buses, i, j = 0; |
1da177e4 | 804 | u16 bctl; |
99ddd552 | 805 | u8 primary, secondary, subordinate; |
a1c19894 | 806 | int broken = 0; |
1da177e4 LT |
807 | |
808 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); | |
99ddd552 BH |
809 | primary = buses & 0xFF; |
810 | secondary = (buses >> 8) & 0xFF; | |
811 | subordinate = (buses >> 16) & 0xFF; | |
1da177e4 | 812 | |
99ddd552 BH |
813 | dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", |
814 | secondary, subordinate, pass); | |
1da177e4 | 815 | |
71f6bd4a YL |
816 | if (!primary && (primary != bus->number) && secondary && subordinate) { |
817 | dev_warn(&dev->dev, "Primary bus is hard wired to 0\n"); | |
818 | primary = bus->number; | |
819 | } | |
820 | ||
a1c19894 BH |
821 | /* Check if setup is sensible at all */ |
822 | if (!pass && | |
1965f66e | 823 | (primary != bus->number || secondary <= bus->number || |
12d87069 | 824 | secondary > subordinate)) { |
1965f66e YL |
825 | dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n", |
826 | secondary, subordinate); | |
a1c19894 BH |
827 | broken = 1; |
828 | } | |
829 | ||
1da177e4 | 830 | /* Disable MasterAbortMode during probing to avoid reporting |
f7625980 | 831 | of bus errors (in some architectures) */ |
1da177e4 LT |
832 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); |
833 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, | |
834 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); | |
835 | ||
f3dbd802 RJ |
836 | pci_enable_crs(dev); |
837 | ||
99ddd552 BH |
838 | if ((secondary || subordinate) && !pcibios_assign_all_busses() && |
839 | !is_cardbus && !broken) { | |
840 | unsigned int cmax; | |
1da177e4 LT |
841 | /* |
842 | * Bus already configured by firmware, process it in the first | |
843 | * pass and just note the configuration. | |
844 | */ | |
845 | if (pass) | |
bbe8f9a3 | 846 | goto out; |
1da177e4 LT |
847 | |
848 | /* | |
2ed85823 AN |
849 | * The bus might already exist for two reasons: Either we are |
850 | * rescanning the bus or the bus is reachable through more than | |
851 | * one bridge. The second case can happen with the i450NX | |
852 | * chipset. | |
1da177e4 | 853 | */ |
99ddd552 | 854 | child = pci_find_bus(pci_domain_nr(bus), secondary); |
74710ded | 855 | if (!child) { |
99ddd552 | 856 | child = pci_add_new_bus(bus, dev, secondary); |
74710ded AC |
857 | if (!child) |
858 | goto out; | |
99ddd552 | 859 | child->primary = primary; |
bc76b731 | 860 | pci_bus_insert_busn_res(child, secondary, subordinate); |
74710ded | 861 | child->bridge_ctl = bctl; |
1da177e4 LT |
862 | } |
863 | ||
1da177e4 | 864 | cmax = pci_scan_child_bus(child); |
c95b0bd6 AN |
865 | if (cmax > subordinate) |
866 | dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n", | |
867 | subordinate, cmax); | |
868 | /* subordinate should equal child->busn_res.end */ | |
869 | if (subordinate > max) | |
870 | max = subordinate; | |
1da177e4 LT |
871 | } else { |
872 | /* | |
873 | * We need to assign a number to this bus which we always | |
874 | * do in the second pass. | |
875 | */ | |
12f44f46 | 876 | if (!pass) { |
619c8c31 | 877 | if (pcibios_assign_all_busses() || broken || is_cardbus) |
12f44f46 IK |
878 | /* Temporarily disable forwarding of the |
879 | configuration cycles on all bridges in | |
880 | this bus segment to avoid possible | |
881 | conflicts in the second pass between two | |
882 | bridges programmed with overlapping | |
883 | bus ranges. */ | |
884 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, | |
885 | buses & ~0xffffff); | |
bbe8f9a3 | 886 | goto out; |
12f44f46 | 887 | } |
1da177e4 LT |
888 | |
889 | /* Clear errors */ | |
890 | pci_write_config_word(dev, PCI_STATUS, 0xffff); | |
891 | ||
7a0b33d4 BH |
892 | /* Prevent assigning a bus number that already exists. |
893 | * This can happen when a bridge is hot-plugged, so in | |
894 | * this case we only re-scan this bus. */ | |
b1a98b69 TC |
895 | child = pci_find_bus(pci_domain_nr(bus), max+1); |
896 | if (!child) { | |
9a4d7d87 | 897 | child = pci_add_new_bus(bus, dev, max+1); |
b1a98b69 TC |
898 | if (!child) |
899 | goto out; | |
12d87069 | 900 | pci_bus_insert_busn_res(child, max+1, 0xff); |
b1a98b69 | 901 | } |
9a4d7d87 | 902 | max++; |
1da177e4 LT |
903 | buses = (buses & 0xff000000) |
904 | | ((unsigned int)(child->primary) << 0) | |
b918c62e YL |
905 | | ((unsigned int)(child->busn_res.start) << 8) |
906 | | ((unsigned int)(child->busn_res.end) << 16); | |
1da177e4 LT |
907 | |
908 | /* | |
909 | * yenta.c forces a secondary latency timer of 176. | |
910 | * Copy that behaviour here. | |
911 | */ | |
912 | if (is_cardbus) { | |
913 | buses &= ~0xff000000; | |
914 | buses |= CARDBUS_LATENCY_TIMER << 24; | |
915 | } | |
7c867c88 | 916 | |
1da177e4 LT |
917 | /* |
918 | * We need to blast all three values with a single write. | |
919 | */ | |
920 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); | |
921 | ||
922 | if (!is_cardbus) { | |
11949255 | 923 | child->bridge_ctl = bctl; |
1da177e4 LT |
924 | max = pci_scan_child_bus(child); |
925 | } else { | |
926 | /* | |
927 | * For CardBus bridges, we leave 4 bus numbers | |
928 | * as cards with a PCI-to-PCI bridge can be | |
929 | * inserted later. | |
930 | */ | |
3c78bc61 | 931 | for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) { |
49887941 | 932 | struct pci_bus *parent = bus; |
cc57450f RS |
933 | if (pci_find_bus(pci_domain_nr(bus), |
934 | max+i+1)) | |
935 | break; | |
49887941 DB |
936 | while (parent->parent) { |
937 | if ((!pcibios_assign_all_busses()) && | |
b918c62e YL |
938 | (parent->busn_res.end > max) && |
939 | (parent->busn_res.end <= max+i)) { | |
49887941 DB |
940 | j = 1; |
941 | } | |
942 | parent = parent->parent; | |
943 | } | |
944 | if (j) { | |
945 | /* | |
946 | * Often, there are two cardbus bridges | |
947 | * -- try to leave one valid bus number | |
948 | * for each one. | |
949 | */ | |
950 | i /= 2; | |
951 | break; | |
952 | } | |
953 | } | |
cc57450f | 954 | max += i; |
1da177e4 LT |
955 | } |
956 | /* | |
957 | * Set the subordinate bus number to its real value. | |
958 | */ | |
bc76b731 | 959 | pci_bus_update_busn_res_end(child, max); |
1da177e4 LT |
960 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); |
961 | } | |
962 | ||
cb3576fa GH |
963 | sprintf(child->name, |
964 | (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), | |
965 | pci_domain_nr(bus), child->number); | |
1da177e4 | 966 | |
d55bef51 | 967 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
49887941 | 968 | while (bus->parent) { |
b918c62e YL |
969 | if ((child->busn_res.end > bus->busn_res.end) || |
970 | (child->number > bus->busn_res.end) || | |
49887941 | 971 | (child->number < bus->number) || |
b918c62e | 972 | (child->busn_res.end < bus->number)) { |
227f0647 | 973 | dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n", |
b918c62e YL |
974 | &child->busn_res, |
975 | (bus->number > child->busn_res.end && | |
976 | bus->busn_res.end < child->number) ? | |
a6f29a98 JP |
977 | "wholly" : "partially", |
978 | bus->self->transparent ? " transparent" : "", | |
865df576 | 979 | dev_name(&bus->dev), |
b918c62e | 980 | &bus->busn_res); |
49887941 DB |
981 | } |
982 | bus = bus->parent; | |
983 | } | |
984 | ||
bbe8f9a3 RB |
985 | out: |
986 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); | |
987 | ||
1da177e4 LT |
988 | return max; |
989 | } | |
b7fe9434 | 990 | EXPORT_SYMBOL(pci_scan_bridge); |
1da177e4 LT |
991 | |
992 | /* | |
993 | * Read interrupt line and base address registers. | |
994 | * The architecture-dependent code can tweak these, of course. | |
995 | */ | |
996 | static void pci_read_irq(struct pci_dev *dev) | |
997 | { | |
998 | unsigned char irq; | |
999 | ||
1000 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); | |
ffeff788 | 1001 | dev->pin = irq; |
1da177e4 LT |
1002 | if (irq) |
1003 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); | |
1004 | dev->irq = irq; | |
1005 | } | |
1006 | ||
bb209c82 | 1007 | void set_pcie_port_type(struct pci_dev *pdev) |
480b93b7 YZ |
1008 | { |
1009 | int pos; | |
1010 | u16 reg16; | |
d0751b98 YW |
1011 | int type; |
1012 | struct pci_dev *parent; | |
480b93b7 YZ |
1013 | |
1014 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
1015 | if (!pos) | |
1016 | return; | |
0efea000 | 1017 | pdev->pcie_cap = pos; |
480b93b7 | 1018 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
786e2288 | 1019 | pdev->pcie_flags_reg = reg16; |
b03e7495 JM |
1020 | pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); |
1021 | pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; | |
d0751b98 YW |
1022 | |
1023 | /* | |
1024 | * A Root Port is always the upstream end of a Link. No PCIe | |
1025 | * component has two Links. Two Links are connected by a Switch | |
1026 | * that has a Port on each Link and internal logic to connect the | |
1027 | * two Ports. | |
1028 | */ | |
1029 | type = pci_pcie_type(pdev); | |
1030 | if (type == PCI_EXP_TYPE_ROOT_PORT) | |
1031 | pdev->has_secondary_link = 1; | |
1032 | else if (type == PCI_EXP_TYPE_UPSTREAM || | |
1033 | type == PCI_EXP_TYPE_DOWNSTREAM) { | |
1034 | parent = pci_upstream_bridge(pdev); | |
b35b1df5 YW |
1035 | |
1036 | /* | |
1037 | * Usually there's an upstream device (Root Port or Switch | |
1038 | * Downstream Port), but we can't assume one exists. | |
1039 | */ | |
1040 | if (parent && !parent->has_secondary_link) | |
d0751b98 YW |
1041 | pdev->has_secondary_link = 1; |
1042 | } | |
480b93b7 YZ |
1043 | } |
1044 | ||
bb209c82 | 1045 | void set_pcie_hotplug_bridge(struct pci_dev *pdev) |
28760489 | 1046 | { |
28760489 EB |
1047 | u32 reg32; |
1048 | ||
59875ae4 | 1049 | pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); |
28760489 EB |
1050 | if (reg32 & PCI_EXP_SLTCAP_HPC) |
1051 | pdev->is_hotplug_bridge = 1; | |
1052 | } | |
1053 | ||
78916b00 AW |
1054 | /** |
1055 | * pci_ext_cfg_is_aliased - is ext config space just an alias of std config? | |
1056 | * @dev: PCI device | |
1057 | * | |
1058 | * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that | |
1059 | * when forwarding a type1 configuration request the bridge must check that | |
1060 | * the extended register address field is zero. The bridge is not permitted | |
1061 | * to forward the transactions and must handle it as an Unsupported Request. | |
1062 | * Some bridges do not follow this rule and simply drop the extended register | |
1063 | * bits, resulting in the standard config space being aliased, every 256 | |
1064 | * bytes across the entire configuration space. Test for this condition by | |
1065 | * comparing the first dword of each potential alias to the vendor/device ID. | |
1066 | * Known offenders: | |
1067 | * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03) | |
1068 | * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40) | |
1069 | */ | |
1070 | static bool pci_ext_cfg_is_aliased(struct pci_dev *dev) | |
1071 | { | |
1072 | #ifdef CONFIG_PCI_QUIRKS | |
1073 | int pos; | |
1074 | u32 header, tmp; | |
1075 | ||
1076 | pci_read_config_dword(dev, PCI_VENDOR_ID, &header); | |
1077 | ||
1078 | for (pos = PCI_CFG_SPACE_SIZE; | |
1079 | pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) { | |
1080 | if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL | |
1081 | || header != tmp) | |
1082 | return false; | |
1083 | } | |
1084 | ||
1085 | return true; | |
1086 | #else | |
1087 | return false; | |
1088 | #endif | |
1089 | } | |
1090 | ||
0b950f0f SH |
1091 | /** |
1092 | * pci_cfg_space_size - get the configuration space size of the PCI device. | |
1093 | * @dev: PCI device | |
1094 | * | |
1095 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices | |
1096 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can | |
1097 | * access it. Maybe we don't have a way to generate extended config space | |
1098 | * accesses, or the device is behind a reverse Express bridge. So we try | |
1099 | * reading the dword at 0x100 which must either be 0 or a valid extended | |
1100 | * capability header. | |
1101 | */ | |
1102 | static int pci_cfg_space_size_ext(struct pci_dev *dev) | |
1103 | { | |
1104 | u32 status; | |
1105 | int pos = PCI_CFG_SPACE_SIZE; | |
1106 | ||
1107 | if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) | |
1108 | goto fail; | |
78916b00 | 1109 | if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev)) |
0b950f0f SH |
1110 | goto fail; |
1111 | ||
1112 | return PCI_CFG_SPACE_EXP_SIZE; | |
1113 | ||
1114 | fail: | |
1115 | return PCI_CFG_SPACE_SIZE; | |
1116 | } | |
1117 | ||
1118 | int pci_cfg_space_size(struct pci_dev *dev) | |
1119 | { | |
1120 | int pos; | |
1121 | u32 status; | |
1122 | u16 class; | |
1123 | ||
1124 | class = dev->class >> 8; | |
1125 | if (class == PCI_CLASS_BRIDGE_HOST) | |
1126 | return pci_cfg_space_size_ext(dev); | |
1127 | ||
1128 | if (!pci_is_pcie(dev)) { | |
1129 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
1130 | if (!pos) | |
1131 | goto fail; | |
1132 | ||
1133 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); | |
1134 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) | |
1135 | goto fail; | |
1136 | } | |
1137 | ||
1138 | return pci_cfg_space_size_ext(dev); | |
1139 | ||
1140 | fail: | |
1141 | return PCI_CFG_SPACE_SIZE; | |
1142 | } | |
1143 | ||
01abc2aa | 1144 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
76e6a1d6 | 1145 | |
22b6839b | 1146 | void pci_msi_setup_pci_dev(struct pci_dev *dev) |
1851617c MT |
1147 | { |
1148 | /* | |
1149 | * Disable the MSI hardware to avoid screaming interrupts | |
1150 | * during boot. This is the power on reset default so | |
1151 | * usually this should be a noop. | |
1152 | */ | |
1153 | dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI); | |
1154 | if (dev->msi_cap) | |
1155 | pci_msi_set_enable(dev, 0); | |
1156 | ||
1157 | dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX); | |
1158 | if (dev->msix_cap) | |
1159 | pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0); | |
1160 | } | |
1161 | ||
1da177e4 LT |
1162 | /** |
1163 | * pci_setup_device - fill in class and map information of a device | |
1164 | * @dev: the device structure to fill | |
1165 | * | |
f7625980 | 1166 | * Initialize the device structure with information about the device's |
1da177e4 LT |
1167 | * vendor,class,memory and IO-space addresses,IRQ lines etc. |
1168 | * Called at initialisation of the PCI subsystem and by CardBus services. | |
480b93b7 YZ |
1169 | * Returns 0 on success and negative if unknown type of device (not normal, |
1170 | * bridge or CardBus). | |
1da177e4 | 1171 | */ |
480b93b7 | 1172 | int pci_setup_device(struct pci_dev *dev) |
1da177e4 LT |
1173 | { |
1174 | u32 class; | |
480b93b7 | 1175 | u8 hdr_type; |
bc577d2b | 1176 | int pos = 0; |
5bfa14ed BH |
1177 | struct pci_bus_region region; |
1178 | struct resource *res; | |
480b93b7 YZ |
1179 | |
1180 | if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) | |
1181 | return -EIO; | |
1182 | ||
1183 | dev->sysdata = dev->bus->sysdata; | |
1184 | dev->dev.parent = dev->bus->bridge; | |
1185 | dev->dev.bus = &pci_bus_type; | |
1186 | dev->hdr_type = hdr_type & 0x7f; | |
1187 | dev->multifunction = !!(hdr_type & 0x80); | |
480b93b7 YZ |
1188 | dev->error_state = pci_channel_io_normal; |
1189 | set_pcie_port_type(dev); | |
1190 | ||
017ffe64 | 1191 | pci_dev_assign_slot(dev); |
480b93b7 YZ |
1192 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) |
1193 | set this higher, assuming the system even supports it. */ | |
1194 | dev->dma_mask = 0xffffffff; | |
1da177e4 | 1195 | |
eebfcfb5 GKH |
1196 | dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), |
1197 | dev->bus->number, PCI_SLOT(dev->devfn), | |
1198 | PCI_FUNC(dev->devfn)); | |
1da177e4 LT |
1199 | |
1200 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); | |
b8a3a521 | 1201 | dev->revision = class & 0xff; |
2dd8ba92 | 1202 | dev->class = class >> 8; /* upper 3 bytes */ |
1da177e4 | 1203 | |
2dd8ba92 YL |
1204 | dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n", |
1205 | dev->vendor, dev->device, dev->hdr_type, dev->class); | |
1da177e4 | 1206 | |
853346e4 YZ |
1207 | /* need to have dev->class ready */ |
1208 | dev->cfg_size = pci_cfg_space_size(dev); | |
1209 | ||
1da177e4 | 1210 | /* "Unknown power state" */ |
3fe9d19f | 1211 | dev->current_state = PCI_UNKNOWN; |
1da177e4 | 1212 | |
1851617c MT |
1213 | pci_msi_setup_pci_dev(dev); |
1214 | ||
1da177e4 LT |
1215 | /* Early fixups, before probing the BARs */ |
1216 | pci_fixup_device(pci_fixup_early, dev); | |
f79b1b14 YZ |
1217 | /* device class may be changed after fixup */ |
1218 | class = dev->class >> 8; | |
1da177e4 LT |
1219 | |
1220 | switch (dev->hdr_type) { /* header type */ | |
1221 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ | |
1222 | if (class == PCI_CLASS_BRIDGE_PCI) | |
1223 | goto bad; | |
1224 | pci_read_irq(dev); | |
1225 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); | |
1226 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1227 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); | |
368c73d4 AC |
1228 | |
1229 | /* | |
075eb9e3 BH |
1230 | * Do the ugly legacy mode stuff here rather than broken chip |
1231 | * quirk code. Legacy mode ATA controllers have fixed | |
1232 | * addresses. These are not always echoed in BAR0-3, and | |
1233 | * BAR0-3 in a few cases contain junk! | |
368c73d4 AC |
1234 | */ |
1235 | if (class == PCI_CLASS_STORAGE_IDE) { | |
1236 | u8 progif; | |
1237 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); | |
1238 | if ((progif & 1) == 0) { | |
5bfa14ed BH |
1239 | region.start = 0x1F0; |
1240 | region.end = 0x1F7; | |
1241 | res = &dev->resource[0]; | |
1242 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1243 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1244 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n", |
1245 | res); | |
5bfa14ed BH |
1246 | region.start = 0x3F6; |
1247 | region.end = 0x3F6; | |
1248 | res = &dev->resource[1]; | |
1249 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1250 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1251 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n", |
1252 | res); | |
368c73d4 AC |
1253 | } |
1254 | if ((progif & 4) == 0) { | |
5bfa14ed BH |
1255 | region.start = 0x170; |
1256 | region.end = 0x177; | |
1257 | res = &dev->resource[2]; | |
1258 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1259 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1260 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n", |
1261 | res); | |
5bfa14ed BH |
1262 | region.start = 0x376; |
1263 | region.end = 0x376; | |
1264 | res = &dev->resource[3]; | |
1265 | res->flags = LEGACY_IO_RESOURCE; | |
fc279850 | 1266 | pcibios_bus_to_resource(dev->bus, res, ®ion); |
075eb9e3 BH |
1267 | dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n", |
1268 | res); | |
368c73d4 AC |
1269 | } |
1270 | } | |
1da177e4 LT |
1271 | break; |
1272 | ||
1273 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ | |
1274 | if (class != PCI_CLASS_BRIDGE_PCI) | |
1275 | goto bad; | |
1276 | /* The PCI-to-PCI bridge spec requires that subtractive | |
1277 | decoding (i.e. transparent) bridge must have programming | |
f7625980 | 1278 | interface code of 0x01. */ |
3efd273b | 1279 | pci_read_irq(dev); |
1da177e4 LT |
1280 | dev->transparent = ((dev->class & 0xff) == 1); |
1281 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); | |
28760489 | 1282 | set_pcie_hotplug_bridge(dev); |
bc577d2b GB |
1283 | pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); |
1284 | if (pos) { | |
1285 | pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); | |
1286 | pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); | |
1287 | } | |
1da177e4 LT |
1288 | break; |
1289 | ||
1290 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ | |
1291 | if (class != PCI_CLASS_BRIDGE_CARDBUS) | |
1292 | goto bad; | |
1293 | pci_read_irq(dev); | |
1294 | pci_read_bases(dev, 1, 0); | |
1295 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); | |
1296 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); | |
1297 | break; | |
1298 | ||
1299 | default: /* unknown header */ | |
227f0647 RD |
1300 | dev_err(&dev->dev, "unknown header type %02x, ignoring device\n", |
1301 | dev->hdr_type); | |
480b93b7 | 1302 | return -EIO; |
1da177e4 LT |
1303 | |
1304 | bad: | |
227f0647 RD |
1305 | dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n", |
1306 | dev->class, dev->hdr_type); | |
2b4aed1d | 1307 | dev->class = PCI_CLASS_NOT_DEFINED << 8; |
1da177e4 LT |
1308 | } |
1309 | ||
1310 | /* We found a fine healthy device, go go go... */ | |
1311 | return 0; | |
1312 | } | |
1313 | ||
9dae3a97 BH |
1314 | static void pci_configure_mps(struct pci_dev *dev) |
1315 | { | |
1316 | struct pci_dev *bridge = pci_upstream_bridge(dev); | |
27d868b5 | 1317 | int mps, p_mps, rc; |
9dae3a97 BH |
1318 | |
1319 | if (!pci_is_pcie(dev) || !bridge || !pci_is_pcie(bridge)) | |
1320 | return; | |
1321 | ||
1322 | mps = pcie_get_mps(dev); | |
1323 | p_mps = pcie_get_mps(bridge); | |
1324 | ||
1325 | if (mps == p_mps) | |
1326 | return; | |
1327 | ||
1328 | if (pcie_bus_config == PCIE_BUS_TUNE_OFF) { | |
1329 | 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", | |
1330 | mps, pci_name(bridge), p_mps); | |
1331 | return; | |
1332 | } | |
27d868b5 KB |
1333 | |
1334 | /* | |
1335 | * Fancier MPS configuration is done later by | |
1336 | * pcie_bus_configure_settings() | |
1337 | */ | |
1338 | if (pcie_bus_config != PCIE_BUS_DEFAULT) | |
1339 | return; | |
1340 | ||
1341 | rc = pcie_set_mps(dev, p_mps); | |
1342 | if (rc) { | |
1343 | dev_warn(&dev->dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n", | |
1344 | p_mps); | |
1345 | return; | |
1346 | } | |
1347 | ||
1348 | dev_info(&dev->dev, "Max Payload Size set to %d (was %d, max %d)\n", | |
1349 | p_mps, mps, 128 << dev->pcie_mpss); | |
9dae3a97 BH |
1350 | } |
1351 | ||
589fcc23 BH |
1352 | static struct hpp_type0 pci_default_type0 = { |
1353 | .revision = 1, | |
1354 | .cache_line_size = 8, | |
1355 | .latency_timer = 0x40, | |
1356 | .enable_serr = 0, | |
1357 | .enable_perr = 0, | |
1358 | }; | |
1359 | ||
1360 | static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp) | |
1361 | { | |
1362 | u16 pci_cmd, pci_bctl; | |
1363 | ||
c6285fc5 | 1364 | if (!hpp) |
589fcc23 | 1365 | hpp = &pci_default_type0; |
589fcc23 BH |
1366 | |
1367 | if (hpp->revision > 1) { | |
1368 | dev_warn(&dev->dev, | |
1369 | "PCI settings rev %d not supported; using defaults\n", | |
1370 | hpp->revision); | |
1371 | hpp = &pci_default_type0; | |
1372 | } | |
1373 | ||
1374 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size); | |
1375 | pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer); | |
1376 | pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); | |
1377 | if (hpp->enable_serr) | |
1378 | pci_cmd |= PCI_COMMAND_SERR; | |
589fcc23 BH |
1379 | if (hpp->enable_perr) |
1380 | pci_cmd |= PCI_COMMAND_PARITY; | |
589fcc23 BH |
1381 | pci_write_config_word(dev, PCI_COMMAND, pci_cmd); |
1382 | ||
1383 | /* Program bridge control value */ | |
1384 | if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { | |
1385 | pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, | |
1386 | hpp->latency_timer); | |
1387 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); | |
1388 | if (hpp->enable_serr) | |
1389 | pci_bctl |= PCI_BRIDGE_CTL_SERR; | |
589fcc23 BH |
1390 | if (hpp->enable_perr) |
1391 | pci_bctl |= PCI_BRIDGE_CTL_PARITY; | |
589fcc23 BH |
1392 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); |
1393 | } | |
1394 | } | |
1395 | ||
1396 | static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp) | |
1397 | { | |
1398 | if (hpp) | |
1399 | dev_warn(&dev->dev, "PCI-X settings not supported\n"); | |
1400 | } | |
1401 | ||
1402 | static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp) | |
1403 | { | |
1404 | int pos; | |
1405 | u32 reg32; | |
1406 | ||
1407 | if (!hpp) | |
1408 | return; | |
1409 | ||
1410 | if (hpp->revision > 1) { | |
1411 | dev_warn(&dev->dev, "PCIe settings rev %d not supported\n", | |
1412 | hpp->revision); | |
1413 | return; | |
1414 | } | |
1415 | ||
302328c0 BH |
1416 | /* |
1417 | * Don't allow _HPX to change MPS or MRRS settings. We manage | |
1418 | * those to make sure they're consistent with the rest of the | |
1419 | * platform. | |
1420 | */ | |
1421 | hpp->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD | | |
1422 | PCI_EXP_DEVCTL_READRQ; | |
1423 | hpp->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD | | |
1424 | PCI_EXP_DEVCTL_READRQ); | |
1425 | ||
589fcc23 BH |
1426 | /* Initialize Device Control Register */ |
1427 | pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, | |
1428 | ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or); | |
1429 | ||
1430 | /* Initialize Link Control Register */ | |
7a1562d4 | 1431 | if (pcie_cap_has_lnkctl(dev)) |
589fcc23 BH |
1432 | pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL, |
1433 | ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or); | |
1434 | ||
1435 | /* Find Advanced Error Reporting Enhanced Capability */ | |
1436 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); | |
1437 | if (!pos) | |
1438 | return; | |
1439 | ||
1440 | /* Initialize Uncorrectable Error Mask Register */ | |
1441 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32); | |
1442 | reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or; | |
1443 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32); | |
1444 | ||
1445 | /* Initialize Uncorrectable Error Severity Register */ | |
1446 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32); | |
1447 | reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or; | |
1448 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32); | |
1449 | ||
1450 | /* Initialize Correctable Error Mask Register */ | |
1451 | pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32); | |
1452 | reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or; | |
1453 | pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32); | |
1454 | ||
1455 | /* Initialize Advanced Error Capabilities and Control Register */ | |
1456 | pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32); | |
1457 | reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or; | |
1458 | pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32); | |
1459 | ||
1460 | /* | |
1461 | * FIXME: The following two registers are not supported yet. | |
1462 | * | |
1463 | * o Secondary Uncorrectable Error Severity Register | |
1464 | * o Secondary Uncorrectable Error Mask Register | |
1465 | */ | |
1466 | } | |
1467 | ||
6cd33649 BH |
1468 | static void pci_configure_device(struct pci_dev *dev) |
1469 | { | |
1470 | struct hotplug_params hpp; | |
1471 | int ret; | |
1472 | ||
9dae3a97 BH |
1473 | pci_configure_mps(dev); |
1474 | ||
6cd33649 BH |
1475 | memset(&hpp, 0, sizeof(hpp)); |
1476 | ret = pci_get_hp_params(dev, &hpp); | |
1477 | if (ret) | |
1478 | return; | |
1479 | ||
1480 | program_hpp_type2(dev, hpp.t2); | |
1481 | program_hpp_type1(dev, hpp.t1); | |
1482 | program_hpp_type0(dev, hpp.t0); | |
1483 | } | |
1484 | ||
201de56e ZY |
1485 | static void pci_release_capabilities(struct pci_dev *dev) |
1486 | { | |
1487 | pci_vpd_release(dev); | |
d1b054da | 1488 | pci_iov_release(dev); |
f796841e | 1489 | pci_free_cap_save_buffers(dev); |
201de56e ZY |
1490 | } |
1491 | ||
1da177e4 LT |
1492 | /** |
1493 | * pci_release_dev - free a pci device structure when all users of it are finished. | |
1494 | * @dev: device that's been disconnected | |
1495 | * | |
1496 | * Will be called only by the device core when all users of this pci device are | |
1497 | * done. | |
1498 | */ | |
1499 | static void pci_release_dev(struct device *dev) | |
1500 | { | |
04480094 | 1501 | struct pci_dev *pci_dev; |
1da177e4 | 1502 | |
04480094 | 1503 | pci_dev = to_pci_dev(dev); |
201de56e | 1504 | pci_release_capabilities(pci_dev); |
98d9f30c | 1505 | pci_release_of_node(pci_dev); |
6ae32c53 | 1506 | pcibios_release_device(pci_dev); |
8b1fce04 | 1507 | pci_bus_put(pci_dev->bus); |
782a985d | 1508 | kfree(pci_dev->driver_override); |
1da177e4 LT |
1509 | kfree(pci_dev); |
1510 | } | |
1511 | ||
3c6e6ae7 | 1512 | struct pci_dev *pci_alloc_dev(struct pci_bus *bus) |
65891215 ME |
1513 | { |
1514 | struct pci_dev *dev; | |
1515 | ||
1516 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); | |
1517 | if (!dev) | |
1518 | return NULL; | |
1519 | ||
65891215 | 1520 | INIT_LIST_HEAD(&dev->bus_list); |
88e7b167 | 1521 | dev->dev.type = &pci_dev_type; |
3c6e6ae7 | 1522 | dev->bus = pci_bus_get(bus); |
65891215 ME |
1523 | |
1524 | return dev; | |
1525 | } | |
3c6e6ae7 GZ |
1526 | EXPORT_SYMBOL(pci_alloc_dev); |
1527 | ||
efdc87da | 1528 | bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, |
3c78bc61 | 1529 | int crs_timeout) |
1da177e4 | 1530 | { |
1da177e4 LT |
1531 | int delay = 1; |
1532 | ||
efdc87da YL |
1533 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
1534 | return false; | |
1da177e4 LT |
1535 | |
1536 | /* some broken boards return 0 or ~0 if a slot is empty: */ | |
efdc87da YL |
1537 | if (*l == 0xffffffff || *l == 0x00000000 || |
1538 | *l == 0x0000ffff || *l == 0xffff0000) | |
1539 | return false; | |
1da177e4 | 1540 | |
89665a6a RJ |
1541 | /* |
1542 | * Configuration Request Retry Status. Some root ports return the | |
1543 | * actual device ID instead of the synthetic ID (0xFFFF) required | |
1544 | * by the PCIe spec. Ignore the device ID and only check for | |
1545 | * (vendor id == 1). | |
1546 | */ | |
1547 | while ((*l & 0xffff) == 0x0001) { | |
efdc87da YL |
1548 | if (!crs_timeout) |
1549 | return false; | |
1550 | ||
1da177e4 LT |
1551 | msleep(delay); |
1552 | delay *= 2; | |
efdc87da YL |
1553 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
1554 | return false; | |
1da177e4 | 1555 | /* Card hasn't responded in 60 seconds? Must be stuck. */ |
efdc87da | 1556 | if (delay > crs_timeout) { |
227f0647 RD |
1557 | printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n", |
1558 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), | |
1559 | PCI_FUNC(devfn)); | |
efdc87da | 1560 | return false; |
1da177e4 LT |
1561 | } |
1562 | } | |
1563 | ||
efdc87da YL |
1564 | return true; |
1565 | } | |
1566 | EXPORT_SYMBOL(pci_bus_read_dev_vendor_id); | |
1567 | ||
1568 | /* | |
1569 | * Read the config data for a PCI device, sanity-check it | |
1570 | * and fill in the dev structure... | |
1571 | */ | |
1572 | static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) | |
1573 | { | |
1574 | struct pci_dev *dev; | |
1575 | u32 l; | |
1576 | ||
1577 | if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000)) | |
1578 | return NULL; | |
1579 | ||
8b1fce04 | 1580 | dev = pci_alloc_dev(bus); |
1da177e4 LT |
1581 | if (!dev) |
1582 | return NULL; | |
1583 | ||
1da177e4 | 1584 | dev->devfn = devfn; |
1da177e4 LT |
1585 | dev->vendor = l & 0xffff; |
1586 | dev->device = (l >> 16) & 0xffff; | |
cef354db | 1587 | |
98d9f30c BH |
1588 | pci_set_of_node(dev); |
1589 | ||
480b93b7 | 1590 | if (pci_setup_device(dev)) { |
8b1fce04 | 1591 | pci_bus_put(dev->bus); |
1da177e4 LT |
1592 | kfree(dev); |
1593 | return NULL; | |
1594 | } | |
1da177e4 LT |
1595 | |
1596 | return dev; | |
1597 | } | |
1598 | ||
201de56e ZY |
1599 | static void pci_init_capabilities(struct pci_dev *dev) |
1600 | { | |
1601 | /* MSI/MSI-X list */ | |
1602 | pci_msi_init_pci_dev(dev); | |
1603 | ||
63f4898a RW |
1604 | /* Buffers for saving PCIe and PCI-X capabilities */ |
1605 | pci_allocate_cap_save_buffers(dev); | |
1606 | ||
201de56e ZY |
1607 | /* Power Management */ |
1608 | pci_pm_init(dev); | |
1609 | ||
1610 | /* Vital Product Data */ | |
1611 | pci_vpd_pci22_init(dev); | |
58c3a727 YZ |
1612 | |
1613 | /* Alternative Routing-ID Forwarding */ | |
31ab2476 | 1614 | pci_configure_ari(dev); |
d1b054da YZ |
1615 | |
1616 | /* Single Root I/O Virtualization */ | |
1617 | pci_iov_init(dev); | |
ae21ee65 | 1618 | |
edc90fee BH |
1619 | /* Address Translation Services */ |
1620 | pci_ats_init(dev); | |
1621 | ||
ae21ee65 | 1622 | /* Enable ACS P2P upstream forwarding */ |
5d990b62 | 1623 | pci_enable_acs(dev); |
201de56e ZY |
1624 | } |
1625 | ||
44aa0c65 MZ |
1626 | static void pci_set_msi_domain(struct pci_dev *dev) |
1627 | { | |
1628 | /* | |
1629 | * If no domain has been set through the pcibios_add_device | |
1630 | * callback, inherit the default from the bus device. | |
1631 | */ | |
1632 | if (!dev_get_msi_domain(&dev->dev)) | |
1633 | dev_set_msi_domain(&dev->dev, | |
1634 | dev_get_msi_domain(&dev->bus->dev)); | |
1635 | } | |
1636 | ||
50230713 SS |
1637 | /** |
1638 | * pci_dma_configure - Setup DMA configuration | |
1639 | * @dev: ptr to pci_dev struct of the PCI device | |
1640 | * | |
1641 | * Function to update PCI devices's DMA configuration using the same | |
1642 | * info from the OF node of host bridge's parent (if any). | |
1643 | */ | |
1644 | static void pci_dma_configure(struct pci_dev *dev) | |
1645 | { | |
1646 | struct device *bridge = pci_get_host_bridge_device(dev); | |
1647 | ||
1648 | if (IS_ENABLED(CONFIG_OF) && dev->dev.of_node) { | |
1649 | if (bridge->parent) | |
1650 | of_dma_configure(&dev->dev, bridge->parent->of_node); | |
1651 | } | |
1652 | ||
1653 | pci_put_host_bridge_device(bridge); | |
1654 | } | |
1655 | ||
96bde06a | 1656 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
1da177e4 | 1657 | { |
4f535093 YL |
1658 | int ret; |
1659 | ||
6cd33649 BH |
1660 | pci_configure_device(dev); |
1661 | ||
cdb9b9f7 PM |
1662 | device_initialize(&dev->dev); |
1663 | dev->dev.release = pci_release_dev; | |
1da177e4 | 1664 | |
7629d19a | 1665 | set_dev_node(&dev->dev, pcibus_to_node(bus)); |
cdb9b9f7 | 1666 | dev->dev.dma_mask = &dev->dma_mask; |
4d57cdfa | 1667 | dev->dev.dma_parms = &dev->dma_parms; |
cdb9b9f7 | 1668 | dev->dev.coherent_dma_mask = 0xffffffffull; |
50230713 | 1669 | pci_dma_configure(dev); |
1da177e4 | 1670 | |
4d57cdfa | 1671 | pci_set_dma_max_seg_size(dev, 65536); |
59fc67de | 1672 | pci_set_dma_seg_boundary(dev, 0xffffffff); |
4d57cdfa | 1673 | |
1da177e4 LT |
1674 | /* Fix up broken headers */ |
1675 | pci_fixup_device(pci_fixup_header, dev); | |
1676 | ||
2069ecfb YL |
1677 | /* moved out from quirk header fixup code */ |
1678 | pci_reassigndev_resource_alignment(dev); | |
1679 | ||
4b77b0a2 RW |
1680 | /* Clear the state_saved flag. */ |
1681 | dev->state_saved = false; | |
1682 | ||
201de56e ZY |
1683 | /* Initialize various capabilities */ |
1684 | pci_init_capabilities(dev); | |
eb9d0fe4 | 1685 | |
1da177e4 LT |
1686 | /* |
1687 | * Add the device to our list of discovered devices | |
1688 | * and the bus list for fixup functions, etc. | |
1689 | */ | |
d71374da | 1690 | down_write(&pci_bus_sem); |
1da177e4 | 1691 | list_add_tail(&dev->bus_list, &bus->devices); |
d71374da | 1692 | up_write(&pci_bus_sem); |
4f535093 | 1693 | |
4f535093 YL |
1694 | ret = pcibios_add_device(dev); |
1695 | WARN_ON(ret < 0); | |
1696 | ||
44aa0c65 MZ |
1697 | /* Setup MSI irq domain */ |
1698 | pci_set_msi_domain(dev); | |
1699 | ||
4f535093 YL |
1700 | /* Notifier could use PCI capabilities */ |
1701 | dev->match_driver = false; | |
1702 | ret = device_add(&dev->dev); | |
1703 | WARN_ON(ret < 0); | |
cdb9b9f7 PM |
1704 | } |
1705 | ||
10874f5a | 1706 | struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn) |
cdb9b9f7 PM |
1707 | { |
1708 | struct pci_dev *dev; | |
1709 | ||
90bdb311 TP |
1710 | dev = pci_get_slot(bus, devfn); |
1711 | if (dev) { | |
1712 | pci_dev_put(dev); | |
1713 | return dev; | |
1714 | } | |
1715 | ||
cdb9b9f7 PM |
1716 | dev = pci_scan_device(bus, devfn); |
1717 | if (!dev) | |
1718 | return NULL; | |
1719 | ||
1720 | pci_device_add(dev, bus); | |
1da177e4 LT |
1721 | |
1722 | return dev; | |
1723 | } | |
b73e9687 | 1724 | EXPORT_SYMBOL(pci_scan_single_device); |
1da177e4 | 1725 | |
b1bd58e4 | 1726 | static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn) |
f07852d6 | 1727 | { |
b1bd58e4 YW |
1728 | int pos; |
1729 | u16 cap = 0; | |
1730 | unsigned next_fn; | |
4fb88c1a | 1731 | |
b1bd58e4 YW |
1732 | if (pci_ari_enabled(bus)) { |
1733 | if (!dev) | |
1734 | return 0; | |
1735 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); | |
1736 | if (!pos) | |
1737 | return 0; | |
4fb88c1a | 1738 | |
b1bd58e4 YW |
1739 | pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap); |
1740 | next_fn = PCI_ARI_CAP_NFN(cap); | |
1741 | if (next_fn <= fn) | |
1742 | return 0; /* protect against malformed list */ | |
f07852d6 | 1743 | |
b1bd58e4 YW |
1744 | return next_fn; |
1745 | } | |
1746 | ||
1747 | /* dev may be NULL for non-contiguous multifunction devices */ | |
1748 | if (!dev || dev->multifunction) | |
1749 | return (fn + 1) % 8; | |
f07852d6 | 1750 | |
f07852d6 MW |
1751 | return 0; |
1752 | } | |
1753 | ||
1754 | static int only_one_child(struct pci_bus *bus) | |
1755 | { | |
1756 | struct pci_dev *parent = bus->self; | |
284f5f9d | 1757 | |
f07852d6 MW |
1758 | if (!parent || !pci_is_pcie(parent)) |
1759 | return 0; | |
62f87c0e | 1760 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT) |
284f5f9d | 1761 | return 1; |
777e61ea | 1762 | if (parent->has_secondary_link && |
284f5f9d | 1763 | !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS)) |
f07852d6 MW |
1764 | return 1; |
1765 | return 0; | |
1766 | } | |
1767 | ||
1da177e4 LT |
1768 | /** |
1769 | * pci_scan_slot - scan a PCI slot on a bus for devices. | |
1770 | * @bus: PCI bus to scan | |
1771 | * @devfn: slot number to scan (must have zero function.) | |
1772 | * | |
1773 | * Scan a PCI slot on the specified PCI bus for devices, adding | |
1774 | * discovered devices to the @bus->devices list. New devices | |
8a1bc901 | 1775 | * will not have is_added set. |
1b69dfc6 TP |
1776 | * |
1777 | * Returns the number of new devices found. | |
1da177e4 | 1778 | */ |
96bde06a | 1779 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
1da177e4 | 1780 | { |
f07852d6 | 1781 | unsigned fn, nr = 0; |
1b69dfc6 | 1782 | struct pci_dev *dev; |
f07852d6 MW |
1783 | |
1784 | if (only_one_child(bus) && (devfn > 0)) | |
1785 | return 0; /* Already scanned the entire slot */ | |
1da177e4 | 1786 | |
1b69dfc6 | 1787 | dev = pci_scan_single_device(bus, devfn); |
4fb88c1a MW |
1788 | if (!dev) |
1789 | return 0; | |
1790 | if (!dev->is_added) | |
1b69dfc6 TP |
1791 | nr++; |
1792 | ||
b1bd58e4 | 1793 | for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) { |
f07852d6 MW |
1794 | dev = pci_scan_single_device(bus, devfn + fn); |
1795 | if (dev) { | |
1796 | if (!dev->is_added) | |
1797 | nr++; | |
1798 | dev->multifunction = 1; | |
1da177e4 LT |
1799 | } |
1800 | } | |
7d715a6c | 1801 | |
149e1637 SL |
1802 | /* only one slot has pcie device */ |
1803 | if (bus->self && nr) | |
7d715a6c SL |
1804 | pcie_aspm_init_link_state(bus->self); |
1805 | ||
1da177e4 LT |
1806 | return nr; |
1807 | } | |
b7fe9434 | 1808 | EXPORT_SYMBOL(pci_scan_slot); |
1da177e4 | 1809 | |
b03e7495 JM |
1810 | static int pcie_find_smpss(struct pci_dev *dev, void *data) |
1811 | { | |
1812 | u8 *smpss = data; | |
1813 | ||
1814 | if (!pci_is_pcie(dev)) | |
1815 | return 0; | |
1816 | ||
d4aa68f6 YW |
1817 | /* |
1818 | * We don't have a way to change MPS settings on devices that have | |
1819 | * drivers attached. A hot-added device might support only the minimum | |
1820 | * MPS setting (MPS=128). Therefore, if the fabric contains a bridge | |
1821 | * where devices may be hot-added, we limit the fabric MPS to 128 so | |
1822 | * hot-added devices will work correctly. | |
1823 | * | |
1824 | * However, if we hot-add a device to a slot directly below a Root | |
1825 | * Port, it's impossible for there to be other existing devices below | |
1826 | * the port. We don't limit the MPS in this case because we can | |
1827 | * reconfigure MPS on both the Root Port and the hot-added device, | |
1828 | * and there are no other devices involved. | |
1829 | * | |
1830 | * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA. | |
b03e7495 | 1831 | */ |
d4aa68f6 YW |
1832 | if (dev->is_hotplug_bridge && |
1833 | pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) | |
b03e7495 JM |
1834 | *smpss = 0; |
1835 | ||
1836 | if (*smpss > dev->pcie_mpss) | |
1837 | *smpss = dev->pcie_mpss; | |
1838 | ||
1839 | return 0; | |
1840 | } | |
1841 | ||
1842 | static void pcie_write_mps(struct pci_dev *dev, int mps) | |
1843 | { | |
62f392ea | 1844 | int rc; |
b03e7495 JM |
1845 | |
1846 | if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { | |
62f392ea | 1847 | mps = 128 << dev->pcie_mpss; |
b03e7495 | 1848 | |
62f87c0e YW |
1849 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT && |
1850 | dev->bus->self) | |
62f392ea | 1851 | /* For "Performance", the assumption is made that |
b03e7495 JM |
1852 | * downstream communication will never be larger than |
1853 | * the MRRS. So, the MPS only needs to be configured | |
1854 | * for the upstream communication. This being the case, | |
1855 | * walk from the top down and set the MPS of the child | |
1856 | * to that of the parent bus. | |
62f392ea JM |
1857 | * |
1858 | * Configure the device MPS with the smaller of the | |
1859 | * device MPSS or the bridge MPS (which is assumed to be | |
1860 | * properly configured at this point to the largest | |
1861 | * allowable MPS based on its parent bus). | |
b03e7495 | 1862 | */ |
62f392ea | 1863 | mps = min(mps, pcie_get_mps(dev->bus->self)); |
b03e7495 JM |
1864 | } |
1865 | ||
1866 | rc = pcie_set_mps(dev, mps); | |
1867 | if (rc) | |
1868 | dev_err(&dev->dev, "Failed attempting to set the MPS\n"); | |
1869 | } | |
1870 | ||
62f392ea | 1871 | static void pcie_write_mrrs(struct pci_dev *dev) |
b03e7495 | 1872 | { |
62f392ea | 1873 | int rc, mrrs; |
b03e7495 | 1874 | |
ed2888e9 JM |
1875 | /* In the "safe" case, do not configure the MRRS. There appear to be |
1876 | * issues with setting MRRS to 0 on a number of devices. | |
1877 | */ | |
ed2888e9 JM |
1878 | if (pcie_bus_config != PCIE_BUS_PERFORMANCE) |
1879 | return; | |
1880 | ||
ed2888e9 JM |
1881 | /* For Max performance, the MRRS must be set to the largest supported |
1882 | * value. However, it cannot be configured larger than the MPS the | |
62f392ea JM |
1883 | * device or the bus can support. This should already be properly |
1884 | * configured by a prior call to pcie_write_mps. | |
ed2888e9 | 1885 | */ |
62f392ea | 1886 | mrrs = pcie_get_mps(dev); |
b03e7495 JM |
1887 | |
1888 | /* MRRS is a R/W register. Invalid values can be written, but a | |
ed2888e9 | 1889 | * subsequent read will verify if the value is acceptable or not. |
b03e7495 JM |
1890 | * If the MRRS value provided is not acceptable (e.g., too large), |
1891 | * shrink the value until it is acceptable to the HW. | |
f7625980 | 1892 | */ |
b03e7495 JM |
1893 | while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) { |
1894 | rc = pcie_set_readrq(dev, mrrs); | |
62f392ea JM |
1895 | if (!rc) |
1896 | break; | |
b03e7495 | 1897 | |
62f392ea | 1898 | dev_warn(&dev->dev, "Failed attempting to set the MRRS\n"); |
b03e7495 JM |
1899 | mrrs /= 2; |
1900 | } | |
62f392ea JM |
1901 | |
1902 | if (mrrs < 128) | |
227f0647 | 1903 | 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 |
1904 | } |
1905 | ||
1906 | static int pcie_bus_configure_set(struct pci_dev *dev, void *data) | |
1907 | { | |
a513a99a | 1908 | int mps, orig_mps; |
b03e7495 JM |
1909 | |
1910 | if (!pci_is_pcie(dev)) | |
1911 | return 0; | |
1912 | ||
27d868b5 KB |
1913 | if (pcie_bus_config == PCIE_BUS_TUNE_OFF || |
1914 | pcie_bus_config == PCIE_BUS_DEFAULT) | |
5895af79 | 1915 | return 0; |
5895af79 | 1916 | |
a513a99a JM |
1917 | mps = 128 << *(u8 *)data; |
1918 | orig_mps = pcie_get_mps(dev); | |
b03e7495 JM |
1919 | |
1920 | pcie_write_mps(dev, mps); | |
62f392ea | 1921 | pcie_write_mrrs(dev); |
b03e7495 | 1922 | |
227f0647 RD |
1923 | dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n", |
1924 | pcie_get_mps(dev), 128 << dev->pcie_mpss, | |
a513a99a | 1925 | orig_mps, pcie_get_readrq(dev)); |
b03e7495 JM |
1926 | |
1927 | return 0; | |
1928 | } | |
1929 | ||
a513a99a | 1930 | /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down, |
b03e7495 JM |
1931 | * parents then children fashion. If this changes, then this code will not |
1932 | * work as designed. | |
1933 | */ | |
a58674ff | 1934 | void pcie_bus_configure_settings(struct pci_bus *bus) |
b03e7495 | 1935 | { |
1e358f94 | 1936 | u8 smpss = 0; |
b03e7495 | 1937 | |
a58674ff | 1938 | if (!bus->self) |
b03e7495 JM |
1939 | return; |
1940 | ||
b03e7495 | 1941 | if (!pci_is_pcie(bus->self)) |
5f39e670 JM |
1942 | return; |
1943 | ||
1944 | /* FIXME - Peer to peer DMA is possible, though the endpoint would need | |
3315472c | 1945 | * to be aware of the MPS of the destination. To work around this, |
5f39e670 JM |
1946 | * simply force the MPS of the entire system to the smallest possible. |
1947 | */ | |
1948 | if (pcie_bus_config == PCIE_BUS_PEER2PEER) | |
1949 | smpss = 0; | |
1950 | ||
b03e7495 | 1951 | if (pcie_bus_config == PCIE_BUS_SAFE) { |
a58674ff | 1952 | smpss = bus->self->pcie_mpss; |
5f39e670 | 1953 | |
b03e7495 JM |
1954 | pcie_find_smpss(bus->self, &smpss); |
1955 | pci_walk_bus(bus, pcie_find_smpss, &smpss); | |
1956 | } | |
1957 | ||
1958 | pcie_bus_configure_set(bus->self, &smpss); | |
1959 | pci_walk_bus(bus, pcie_bus_configure_set, &smpss); | |
1960 | } | |
debc3b77 | 1961 | EXPORT_SYMBOL_GPL(pcie_bus_configure_settings); |
b03e7495 | 1962 | |
15856ad5 | 1963 | unsigned int pci_scan_child_bus(struct pci_bus *bus) |
1da177e4 | 1964 | { |
b918c62e | 1965 | unsigned int devfn, pass, max = bus->busn_res.start; |
1da177e4 LT |
1966 | struct pci_dev *dev; |
1967 | ||
0207c356 | 1968 | dev_dbg(&bus->dev, "scanning bus\n"); |
1da177e4 LT |
1969 | |
1970 | /* Go find them, Rover! */ | |
1971 | for (devfn = 0; devfn < 0x100; devfn += 8) | |
1972 | pci_scan_slot(bus, devfn); | |
1973 | ||
a28724b0 YZ |
1974 | /* Reserve buses for SR-IOV capability. */ |
1975 | max += pci_iov_bus_range(bus); | |
1976 | ||
1da177e4 LT |
1977 | /* |
1978 | * After performing arch-dependent fixup of the bus, look behind | |
1979 | * all PCI-to-PCI bridges on this bus. | |
1980 | */ | |
74710ded | 1981 | if (!bus->is_added) { |
0207c356 | 1982 | dev_dbg(&bus->dev, "fixups for bus\n"); |
74710ded | 1983 | pcibios_fixup_bus(bus); |
981cf9ea | 1984 | bus->is_added = 1; |
74710ded AC |
1985 | } |
1986 | ||
3c78bc61 | 1987 | for (pass = 0; pass < 2; pass++) |
1da177e4 | 1988 | list_for_each_entry(dev, &bus->devices, bus_list) { |
6788a51f | 1989 | if (pci_is_bridge(dev)) |
1da177e4 LT |
1990 | max = pci_scan_bridge(bus, dev, max, pass); |
1991 | } | |
1992 | ||
1993 | /* | |
1994 | * We've scanned the bus and so we know all about what's on | |
1995 | * the other side of any bridges that may be on this bus plus | |
1996 | * any devices. | |
1997 | * | |
1998 | * Return how far we've got finding sub-buses. | |
1999 | */ | |
0207c356 | 2000 | dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); |
1da177e4 LT |
2001 | return max; |
2002 | } | |
b7fe9434 | 2003 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
1da177e4 | 2004 | |
6c0cc950 RW |
2005 | /** |
2006 | * pcibios_root_bridge_prepare - Platform-specific host bridge setup. | |
2007 | * @bridge: Host bridge to set up. | |
2008 | * | |
2009 | * Default empty implementation. Replace with an architecture-specific setup | |
2010 | * routine, if necessary. | |
2011 | */ | |
2012 | int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) | |
2013 | { | |
2014 | return 0; | |
2015 | } | |
2016 | ||
10a95747 JL |
2017 | void __weak pcibios_add_bus(struct pci_bus *bus) |
2018 | { | |
2019 | } | |
2020 | ||
2021 | void __weak pcibios_remove_bus(struct pci_bus *bus) | |
2022 | { | |
2023 | } | |
2024 | ||
166c6370 BH |
2025 | struct pci_bus *pci_create_root_bus(struct device *parent, int bus, |
2026 | struct pci_ops *ops, void *sysdata, struct list_head *resources) | |
1da177e4 | 2027 | { |
0efd5aab | 2028 | int error; |
5a21d70d | 2029 | struct pci_host_bridge *bridge; |
0207c356 | 2030 | struct pci_bus *b, *b2; |
14d76b68 | 2031 | struct resource_entry *window, *n; |
a9d9f527 | 2032 | struct resource *res; |
0efd5aab BH |
2033 | resource_size_t offset; |
2034 | char bus_addr[64]; | |
2035 | char *fmt; | |
1da177e4 | 2036 | |
670ba0c8 | 2037 | b = pci_alloc_bus(NULL); |
1da177e4 | 2038 | if (!b) |
7b543663 | 2039 | return NULL; |
1da177e4 LT |
2040 | |
2041 | b->sysdata = sysdata; | |
2042 | b->ops = ops; | |
4f535093 | 2043 | b->number = b->busn_res.start = bus; |
670ba0c8 | 2044 | pci_bus_assign_domain_nr(b, parent); |
0207c356 BH |
2045 | b2 = pci_find_bus(pci_domain_nr(b), bus); |
2046 | if (b2) { | |
1da177e4 | 2047 | /* If we already got to this bus through a different bridge, ignore it */ |
0207c356 | 2048 | dev_dbg(&b2->dev, "bus already known\n"); |
1da177e4 LT |
2049 | goto err_out; |
2050 | } | |
d71374da | 2051 | |
7b543663 YL |
2052 | bridge = pci_alloc_host_bridge(b); |
2053 | if (!bridge) | |
2054 | goto err_out; | |
2055 | ||
2056 | bridge->dev.parent = parent; | |
70efde2a | 2057 | bridge->dev.release = pci_release_host_bridge_dev; |
7b543663 | 2058 | dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); |
6c0cc950 | 2059 | error = pcibios_root_bridge_prepare(bridge); |
343df771 JL |
2060 | if (error) { |
2061 | kfree(bridge); | |
2062 | goto err_out; | |
2063 | } | |
6c0cc950 | 2064 | |
7b543663 | 2065 | error = device_register(&bridge->dev); |
343df771 JL |
2066 | if (error) { |
2067 | put_device(&bridge->dev); | |
2068 | goto err_out; | |
2069 | } | |
7b543663 | 2070 | b->bridge = get_device(&bridge->dev); |
a1e4d72c | 2071 | device_enable_async_suspend(b->bridge); |
98d9f30c | 2072 | pci_set_bus_of_node(b); |
44aa0c65 | 2073 | pci_set_bus_msi_domain(b); |
1da177e4 | 2074 | |
0d358f22 YL |
2075 | if (!parent) |
2076 | set_dev_node(b->bridge, pcibus_to_node(b)); | |
2077 | ||
fd7d1ced GKH |
2078 | b->dev.class = &pcibus_class; |
2079 | b->dev.parent = b->bridge; | |
1a927133 | 2080 | dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); |
fd7d1ced | 2081 | error = device_register(&b->dev); |
1da177e4 LT |
2082 | if (error) |
2083 | goto class_dev_reg_err; | |
1da177e4 | 2084 | |
10a95747 JL |
2085 | pcibios_add_bus(b); |
2086 | ||
1da177e4 LT |
2087 | /* Create legacy_io and legacy_mem files for this bus */ |
2088 | pci_create_legacy_files(b); | |
2089 | ||
a9d9f527 BH |
2090 | if (parent) |
2091 | dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); | |
2092 | else | |
2093 | printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); | |
2094 | ||
0efd5aab | 2095 | /* Add initial resources to the bus */ |
14d76b68 JL |
2096 | resource_list_for_each_entry_safe(window, n, resources) { |
2097 | list_move_tail(&window->node, &bridge->windows); | |
0efd5aab BH |
2098 | res = window->res; |
2099 | offset = window->offset; | |
f848ffb1 YL |
2100 | if (res->flags & IORESOURCE_BUS) |
2101 | pci_bus_insert_busn_res(b, bus, res->end); | |
2102 | else | |
2103 | pci_bus_add_resource(b, res, 0); | |
0efd5aab BH |
2104 | if (offset) { |
2105 | if (resource_type(res) == IORESOURCE_IO) | |
2106 | fmt = " (bus address [%#06llx-%#06llx])"; | |
2107 | else | |
2108 | fmt = " (bus address [%#010llx-%#010llx])"; | |
2109 | snprintf(bus_addr, sizeof(bus_addr), fmt, | |
2110 | (unsigned long long) (res->start - offset), | |
2111 | (unsigned long long) (res->end - offset)); | |
2112 | } else | |
2113 | bus_addr[0] = '\0'; | |
2114 | dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr); | |
a9d9f527 BH |
2115 | } |
2116 | ||
a5390aa6 BH |
2117 | down_write(&pci_bus_sem); |
2118 | list_add_tail(&b->node, &pci_root_buses); | |
2119 | up_write(&pci_bus_sem); | |
2120 | ||
1da177e4 LT |
2121 | return b; |
2122 | ||
1da177e4 | 2123 | class_dev_reg_err: |
7b543663 YL |
2124 | put_device(&bridge->dev); |
2125 | device_unregister(&bridge->dev); | |
1da177e4 | 2126 | err_out: |
1da177e4 LT |
2127 | kfree(b); |
2128 | return NULL; | |
2129 | } | |
e6b29dea | 2130 | EXPORT_SYMBOL_GPL(pci_create_root_bus); |
cdb9b9f7 | 2131 | |
98a35831 YL |
2132 | int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) |
2133 | { | |
2134 | struct resource *res = &b->busn_res; | |
2135 | struct resource *parent_res, *conflict; | |
2136 | ||
2137 | res->start = bus; | |
2138 | res->end = bus_max; | |
2139 | res->flags = IORESOURCE_BUS; | |
2140 | ||
2141 | if (!pci_is_root_bus(b)) | |
2142 | parent_res = &b->parent->busn_res; | |
2143 | else { | |
2144 | parent_res = get_pci_domain_busn_res(pci_domain_nr(b)); | |
2145 | res->flags |= IORESOURCE_PCI_FIXED; | |
2146 | } | |
2147 | ||
ced04d15 | 2148 | conflict = request_resource_conflict(parent_res, res); |
98a35831 YL |
2149 | |
2150 | if (conflict) | |
2151 | dev_printk(KERN_DEBUG, &b->dev, | |
2152 | "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n", | |
2153 | res, pci_is_root_bus(b) ? "domain " : "", | |
2154 | parent_res, conflict->name, conflict); | |
98a35831 YL |
2155 | |
2156 | return conflict == NULL; | |
2157 | } | |
2158 | ||
2159 | int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max) | |
2160 | { | |
2161 | struct resource *res = &b->busn_res; | |
2162 | struct resource old_res = *res; | |
2163 | resource_size_t size; | |
2164 | int ret; | |
2165 | ||
2166 | if (res->start > bus_max) | |
2167 | return -EINVAL; | |
2168 | ||
2169 | size = bus_max - res->start + 1; | |
2170 | ret = adjust_resource(res, res->start, size); | |
2171 | dev_printk(KERN_DEBUG, &b->dev, | |
2172 | "busn_res: %pR end %s updated to %02x\n", | |
2173 | &old_res, ret ? "can not be" : "is", bus_max); | |
2174 | ||
2175 | if (!ret && !res->parent) | |
2176 | pci_bus_insert_busn_res(b, res->start, res->end); | |
2177 | ||
2178 | return ret; | |
2179 | } | |
2180 | ||
2181 | void pci_bus_release_busn_res(struct pci_bus *b) | |
2182 | { | |
2183 | struct resource *res = &b->busn_res; | |
2184 | int ret; | |
2185 | ||
2186 | if (!res->flags || !res->parent) | |
2187 | return; | |
2188 | ||
2189 | ret = release_resource(res); | |
2190 | dev_printk(KERN_DEBUG, &b->dev, | |
2191 | "busn_res: %pR %s released\n", | |
2192 | res, ret ? "can not be" : "is"); | |
2193 | } | |
2194 | ||
d2a7926d LP |
2195 | struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus, |
2196 | struct pci_ops *ops, void *sysdata, | |
2197 | struct list_head *resources, struct msi_controller *msi) | |
a2ebb827 | 2198 | { |
14d76b68 | 2199 | struct resource_entry *window; |
4d99f524 | 2200 | bool found = false; |
a2ebb827 | 2201 | struct pci_bus *b; |
4d99f524 YL |
2202 | int max; |
2203 | ||
14d76b68 | 2204 | resource_list_for_each_entry(window, resources) |
4d99f524 YL |
2205 | if (window->res->flags & IORESOURCE_BUS) { |
2206 | found = true; | |
2207 | break; | |
2208 | } | |
a2ebb827 BH |
2209 | |
2210 | b = pci_create_root_bus(parent, bus, ops, sysdata, resources); | |
2211 | if (!b) | |
2212 | return NULL; | |
2213 | ||
d2a7926d LP |
2214 | b->msi = msi; |
2215 | ||
4d99f524 YL |
2216 | if (!found) { |
2217 | dev_info(&b->dev, | |
2218 | "No busn resource found for root bus, will use [bus %02x-ff]\n", | |
2219 | bus); | |
2220 | pci_bus_insert_busn_res(b, bus, 255); | |
2221 | } | |
2222 | ||
2223 | max = pci_scan_child_bus(b); | |
2224 | ||
2225 | if (!found) | |
2226 | pci_bus_update_busn_res_end(b, max); | |
2227 | ||
a2ebb827 BH |
2228 | return b; |
2229 | } | |
d2a7926d LP |
2230 | |
2231 | struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, | |
2232 | struct pci_ops *ops, void *sysdata, struct list_head *resources) | |
2233 | { | |
2234 | return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources, | |
2235 | NULL); | |
2236 | } | |
a2ebb827 BH |
2237 | EXPORT_SYMBOL(pci_scan_root_bus); |
2238 | ||
15856ad5 | 2239 | struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, |
de4b2f76 BH |
2240 | void *sysdata) |
2241 | { | |
2242 | LIST_HEAD(resources); | |
2243 | struct pci_bus *b; | |
2244 | ||
2245 | pci_add_resource(&resources, &ioport_resource); | |
2246 | pci_add_resource(&resources, &iomem_resource); | |
857c3b66 | 2247 | pci_add_resource(&resources, &busn_resource); |
de4b2f76 BH |
2248 | b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources); |
2249 | if (b) { | |
857c3b66 | 2250 | pci_scan_child_bus(b); |
de4b2f76 BH |
2251 | } else { |
2252 | pci_free_resource_list(&resources); | |
2253 | } | |
2254 | return b; | |
2255 | } | |
2256 | EXPORT_SYMBOL(pci_scan_bus); | |
2257 | ||
2f320521 YL |
2258 | /** |
2259 | * pci_rescan_bus_bridge_resize - scan a PCI bus for devices. | |
2260 | * @bridge: PCI bridge for the bus to scan | |
2261 | * | |
2262 | * Scan a PCI bus and child buses for new devices, add them, | |
2263 | * and enable them, resizing bridge mmio/io resource if necessary | |
2264 | * and possible. The caller must ensure the child devices are already | |
2265 | * removed for resizing to occur. | |
2266 | * | |
2267 | * Returns the max number of subordinate bus discovered. | |
2268 | */ | |
10874f5a | 2269 | unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge) |
2f320521 YL |
2270 | { |
2271 | unsigned int max; | |
2272 | struct pci_bus *bus = bridge->subordinate; | |
2273 | ||
2274 | max = pci_scan_child_bus(bus); | |
2275 | ||
2276 | pci_assign_unassigned_bridge_resources(bridge); | |
2277 | ||
2278 | pci_bus_add_devices(bus); | |
2279 | ||
2280 | return max; | |
2281 | } | |
2282 | ||
a5213a31 YL |
2283 | /** |
2284 | * pci_rescan_bus - scan a PCI bus for devices. | |
2285 | * @bus: PCI bus to scan | |
2286 | * | |
2287 | * Scan a PCI bus and child buses for new devices, adds them, | |
2288 | * and enables them. | |
2289 | * | |
2290 | * Returns the max number of subordinate bus discovered. | |
2291 | */ | |
10874f5a | 2292 | unsigned int pci_rescan_bus(struct pci_bus *bus) |
a5213a31 YL |
2293 | { |
2294 | unsigned int max; | |
2295 | ||
2296 | max = pci_scan_child_bus(bus); | |
2297 | pci_assign_unassigned_bus_resources(bus); | |
2298 | pci_bus_add_devices(bus); | |
2299 | ||
2300 | return max; | |
2301 | } | |
2302 | EXPORT_SYMBOL_GPL(pci_rescan_bus); | |
2303 | ||
9d16947b RW |
2304 | /* |
2305 | * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal | |
2306 | * routines should always be executed under this mutex. | |
2307 | */ | |
2308 | static DEFINE_MUTEX(pci_rescan_remove_lock); | |
2309 | ||
2310 | void pci_lock_rescan_remove(void) | |
2311 | { | |
2312 | mutex_lock(&pci_rescan_remove_lock); | |
2313 | } | |
2314 | EXPORT_SYMBOL_GPL(pci_lock_rescan_remove); | |
2315 | ||
2316 | void pci_unlock_rescan_remove(void) | |
2317 | { | |
2318 | mutex_unlock(&pci_rescan_remove_lock); | |
2319 | } | |
2320 | EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove); | |
2321 | ||
3c78bc61 RD |
2322 | static int __init pci_sort_bf_cmp(const struct device *d_a, |
2323 | const struct device *d_b) | |
6b4b78fe | 2324 | { |
99178b03 GKH |
2325 | const struct pci_dev *a = to_pci_dev(d_a); |
2326 | const struct pci_dev *b = to_pci_dev(d_b); | |
2327 | ||
6b4b78fe MD |
2328 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; |
2329 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; | |
2330 | ||
2331 | if (a->bus->number < b->bus->number) return -1; | |
2332 | else if (a->bus->number > b->bus->number) return 1; | |
2333 | ||
2334 | if (a->devfn < b->devfn) return -1; | |
2335 | else if (a->devfn > b->devfn) return 1; | |
2336 | ||
2337 | return 0; | |
2338 | } | |
2339 | ||
5ff580c1 | 2340 | void __init pci_sort_breadthfirst(void) |
6b4b78fe | 2341 | { |
99178b03 | 2342 | bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); |
6b4b78fe | 2343 | } |