Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * PCI Bus Services, see include/linux/pci.h for further explanation. |
3 | * | |
4 | * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter, | |
5 | * David Mosberger-Tang | |
6 | * | |
7 | * Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz> | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/pci.h> | |
075c1771 | 14 | #include <linux/pm.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/spinlock.h> | |
4e57b681 | 18 | #include <linux/string.h> |
229f5afd | 19 | #include <linux/log2.h> |
7d715a6c | 20 | #include <linux/pci-aspm.h> |
c300bd2f | 21 | #include <linux/pm_wakeup.h> |
8dd7f803 | 22 | #include <linux/interrupt.h> |
32a9a682 | 23 | #include <linux/device.h> |
b67ea761 | 24 | #include <linux/pm_runtime.h> |
32a9a682 | 25 | #include <asm/setup.h> |
bc56b9e0 | 26 | #include "pci.h" |
1da177e4 | 27 | |
00240c38 AS |
28 | const char *pci_power_names[] = { |
29 | "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown", | |
30 | }; | |
31 | EXPORT_SYMBOL_GPL(pci_power_names); | |
32 | ||
93177a74 RW |
33 | int isa_dma_bridge_buggy; |
34 | EXPORT_SYMBOL(isa_dma_bridge_buggy); | |
35 | ||
36 | int pci_pci_problems; | |
37 | EXPORT_SYMBOL(pci_pci_problems); | |
38 | ||
1ae861e6 RW |
39 | unsigned int pci_pm_d3_delay; |
40 | ||
df17e62e MG |
41 | static void pci_pme_list_scan(struct work_struct *work); |
42 | ||
43 | static LIST_HEAD(pci_pme_list); | |
44 | static DEFINE_MUTEX(pci_pme_list_mutex); | |
45 | static DECLARE_DELAYED_WORK(pci_pme_work, pci_pme_list_scan); | |
46 | ||
47 | struct pci_pme_device { | |
48 | struct list_head list; | |
49 | struct pci_dev *dev; | |
50 | }; | |
51 | ||
52 | #define PME_TIMEOUT 1000 /* How long between PME checks */ | |
53 | ||
1ae861e6 RW |
54 | static void pci_dev_d3_sleep(struct pci_dev *dev) |
55 | { | |
56 | unsigned int delay = dev->d3_delay; | |
57 | ||
58 | if (delay < pci_pm_d3_delay) | |
59 | delay = pci_pm_d3_delay; | |
60 | ||
61 | msleep(delay); | |
62 | } | |
1da177e4 | 63 | |
32a2eea7 JG |
64 | #ifdef CONFIG_PCI_DOMAINS |
65 | int pci_domains_supported = 1; | |
66 | #endif | |
67 | ||
4516a618 AN |
68 | #define DEFAULT_CARDBUS_IO_SIZE (256) |
69 | #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024) | |
70 | /* pci=cbmemsize=nnM,cbiosize=nn can override this */ | |
71 | unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE; | |
72 | unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE; | |
73 | ||
28760489 EB |
74 | #define DEFAULT_HOTPLUG_IO_SIZE (256) |
75 | #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024) | |
76 | /* pci=hpmemsize=nnM,hpiosize=nn can override this */ | |
77 | unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE; | |
78 | unsigned long pci_hotplug_mem_size = DEFAULT_HOTPLUG_MEM_SIZE; | |
79 | ||
5f39e670 | 80 | enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_TUNE_OFF; |
b03e7495 | 81 | |
ac1aa47b JB |
82 | /* |
83 | * The default CLS is used if arch didn't set CLS explicitly and not | |
84 | * all pci devices agree on the same value. Arch can override either | |
85 | * the dfl or actual value as it sees fit. Don't forget this is | |
86 | * measured in 32-bit words, not bytes. | |
87 | */ | |
98e724c7 | 88 | u8 pci_dfl_cache_line_size __devinitdata = L1_CACHE_BYTES >> 2; |
ac1aa47b JB |
89 | u8 pci_cache_line_size; |
90 | ||
96c55900 MS |
91 | /* |
92 | * If we set up a device for bus mastering, we need to check the latency | |
93 | * timer as certain BIOSes forget to set it properly. | |
94 | */ | |
95 | unsigned int pcibios_max_latency = 255; | |
96 | ||
1da177e4 LT |
97 | /** |
98 | * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children | |
99 | * @bus: pointer to PCI bus structure to search | |
100 | * | |
101 | * Given a PCI bus, returns the highest PCI bus number present in the set | |
102 | * including the given PCI bus and its list of child PCI buses. | |
103 | */ | |
96bde06a | 104 | unsigned char pci_bus_max_busnr(struct pci_bus* bus) |
1da177e4 LT |
105 | { |
106 | struct list_head *tmp; | |
107 | unsigned char max, n; | |
108 | ||
b82db5ce | 109 | max = bus->subordinate; |
1da177e4 LT |
110 | list_for_each(tmp, &bus->children) { |
111 | n = pci_bus_max_busnr(pci_bus_b(tmp)); | |
112 | if(n > max) | |
113 | max = n; | |
114 | } | |
115 | return max; | |
116 | } | |
b82db5ce | 117 | EXPORT_SYMBOL_GPL(pci_bus_max_busnr); |
1da177e4 | 118 | |
1684f5dd AM |
119 | #ifdef CONFIG_HAS_IOMEM |
120 | void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) | |
121 | { | |
122 | /* | |
123 | * Make sure the BAR is actually a memory resource, not an IO resource | |
124 | */ | |
125 | if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) { | |
126 | WARN_ON(1); | |
127 | return NULL; | |
128 | } | |
129 | return ioremap_nocache(pci_resource_start(pdev, bar), | |
130 | pci_resource_len(pdev, bar)); | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(pci_ioremap_bar); | |
133 | #endif | |
134 | ||
b82db5ce | 135 | #if 0 |
1da177e4 LT |
136 | /** |
137 | * pci_max_busnr - returns maximum PCI bus number | |
138 | * | |
139 | * Returns the highest PCI bus number present in the system global list of | |
140 | * PCI buses. | |
141 | */ | |
142 | unsigned char __devinit | |
143 | pci_max_busnr(void) | |
144 | { | |
145 | struct pci_bus *bus = NULL; | |
146 | unsigned char max, n; | |
147 | ||
148 | max = 0; | |
149 | while ((bus = pci_find_next_bus(bus)) != NULL) { | |
150 | n = pci_bus_max_busnr(bus); | |
151 | if(n > max) | |
152 | max = n; | |
153 | } | |
154 | return max; | |
155 | } | |
156 | ||
54c762fe AB |
157 | #endif /* 0 */ |
158 | ||
687d5fe3 ME |
159 | #define PCI_FIND_CAP_TTL 48 |
160 | ||
161 | static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn, | |
162 | u8 pos, int cap, int *ttl) | |
24a4e377 RD |
163 | { |
164 | u8 id; | |
24a4e377 | 165 | |
687d5fe3 | 166 | while ((*ttl)--) { |
24a4e377 RD |
167 | pci_bus_read_config_byte(bus, devfn, pos, &pos); |
168 | if (pos < 0x40) | |
169 | break; | |
170 | pos &= ~3; | |
171 | pci_bus_read_config_byte(bus, devfn, pos + PCI_CAP_LIST_ID, | |
172 | &id); | |
173 | if (id == 0xff) | |
174 | break; | |
175 | if (id == cap) | |
176 | return pos; | |
177 | pos += PCI_CAP_LIST_NEXT; | |
178 | } | |
179 | return 0; | |
180 | } | |
181 | ||
687d5fe3 ME |
182 | static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn, |
183 | u8 pos, int cap) | |
184 | { | |
185 | int ttl = PCI_FIND_CAP_TTL; | |
186 | ||
187 | return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl); | |
188 | } | |
189 | ||
24a4e377 RD |
190 | int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap) |
191 | { | |
192 | return __pci_find_next_cap(dev->bus, dev->devfn, | |
193 | pos + PCI_CAP_LIST_NEXT, cap); | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(pci_find_next_capability); | |
196 | ||
d3bac118 ME |
197 | static int __pci_bus_find_cap_start(struct pci_bus *bus, |
198 | unsigned int devfn, u8 hdr_type) | |
1da177e4 LT |
199 | { |
200 | u16 status; | |
1da177e4 LT |
201 | |
202 | pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status); | |
203 | if (!(status & PCI_STATUS_CAP_LIST)) | |
204 | return 0; | |
205 | ||
206 | switch (hdr_type) { | |
207 | case PCI_HEADER_TYPE_NORMAL: | |
208 | case PCI_HEADER_TYPE_BRIDGE: | |
d3bac118 | 209 | return PCI_CAPABILITY_LIST; |
1da177e4 | 210 | case PCI_HEADER_TYPE_CARDBUS: |
d3bac118 | 211 | return PCI_CB_CAPABILITY_LIST; |
1da177e4 LT |
212 | default: |
213 | return 0; | |
214 | } | |
d3bac118 ME |
215 | |
216 | return 0; | |
1da177e4 LT |
217 | } |
218 | ||
219 | /** | |
220 | * pci_find_capability - query for devices' capabilities | |
221 | * @dev: PCI device to query | |
222 | * @cap: capability code | |
223 | * | |
224 | * Tell if a device supports a given PCI capability. | |
225 | * Returns the address of the requested capability structure within the | |
226 | * device's PCI configuration space or 0 in case the device does not | |
227 | * support it. Possible values for @cap: | |
228 | * | |
229 | * %PCI_CAP_ID_PM Power Management | |
230 | * %PCI_CAP_ID_AGP Accelerated Graphics Port | |
231 | * %PCI_CAP_ID_VPD Vital Product Data | |
232 | * %PCI_CAP_ID_SLOTID Slot Identification | |
233 | * %PCI_CAP_ID_MSI Message Signalled Interrupts | |
234 | * %PCI_CAP_ID_CHSWP CompactPCI HotSwap | |
235 | * %PCI_CAP_ID_PCIX PCI-X | |
236 | * %PCI_CAP_ID_EXP PCI Express | |
237 | */ | |
238 | int pci_find_capability(struct pci_dev *dev, int cap) | |
239 | { | |
d3bac118 ME |
240 | int pos; |
241 | ||
242 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); | |
243 | if (pos) | |
244 | pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap); | |
245 | ||
246 | return pos; | |
1da177e4 LT |
247 | } |
248 | ||
249 | /** | |
250 | * pci_bus_find_capability - query for devices' capabilities | |
251 | * @bus: the PCI bus to query | |
252 | * @devfn: PCI device to query | |
253 | * @cap: capability code | |
254 | * | |
255 | * Like pci_find_capability() but works for pci devices that do not have a | |
256 | * pci_dev structure set up yet. | |
257 | * | |
258 | * Returns the address of the requested capability structure within the | |
259 | * device's PCI configuration space or 0 in case the device does not | |
260 | * support it. | |
261 | */ | |
262 | int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap) | |
263 | { | |
d3bac118 | 264 | int pos; |
1da177e4 LT |
265 | u8 hdr_type; |
266 | ||
267 | pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type); | |
268 | ||
d3bac118 ME |
269 | pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f); |
270 | if (pos) | |
271 | pos = __pci_find_next_cap(bus, devfn, pos, cap); | |
272 | ||
273 | return pos; | |
1da177e4 LT |
274 | } |
275 | ||
276 | /** | |
277 | * pci_find_ext_capability - Find an extended capability | |
278 | * @dev: PCI device to query | |
279 | * @cap: capability code | |
280 | * | |
281 | * Returns the address of the requested extended capability structure | |
282 | * within the device's PCI configuration space or 0 if the device does | |
283 | * not support it. Possible values for @cap: | |
284 | * | |
285 | * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting | |
286 | * %PCI_EXT_CAP_ID_VC Virtual Channel | |
287 | * %PCI_EXT_CAP_ID_DSN Device Serial Number | |
288 | * %PCI_EXT_CAP_ID_PWR Power Budgeting | |
289 | */ | |
290 | int pci_find_ext_capability(struct pci_dev *dev, int cap) | |
291 | { | |
292 | u32 header; | |
557848c3 ZY |
293 | int ttl; |
294 | int pos = PCI_CFG_SPACE_SIZE; | |
1da177e4 | 295 | |
557848c3 ZY |
296 | /* minimum 8 bytes per capability */ |
297 | ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; | |
298 | ||
299 | if (dev->cfg_size <= PCI_CFG_SPACE_SIZE) | |
1da177e4 LT |
300 | return 0; |
301 | ||
302 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) | |
303 | return 0; | |
304 | ||
305 | /* | |
306 | * If we have no capabilities, this is indicated by cap ID, | |
307 | * cap version and next pointer all being 0. | |
308 | */ | |
309 | if (header == 0) | |
310 | return 0; | |
311 | ||
312 | while (ttl-- > 0) { | |
313 | if (PCI_EXT_CAP_ID(header) == cap) | |
314 | return pos; | |
315 | ||
316 | pos = PCI_EXT_CAP_NEXT(header); | |
557848c3 | 317 | if (pos < PCI_CFG_SPACE_SIZE) |
1da177e4 LT |
318 | break; |
319 | ||
320 | if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL) | |
321 | break; | |
322 | } | |
323 | ||
324 | return 0; | |
325 | } | |
3a720d72 | 326 | EXPORT_SYMBOL_GPL(pci_find_ext_capability); |
1da177e4 | 327 | |
cf4c43dd JB |
328 | /** |
329 | * pci_bus_find_ext_capability - find an extended capability | |
330 | * @bus: the PCI bus to query | |
331 | * @devfn: PCI device to query | |
332 | * @cap: capability code | |
333 | * | |
334 | * Like pci_find_ext_capability() but works for pci devices that do not have a | |
335 | * pci_dev structure set up yet. | |
336 | * | |
337 | * Returns the address of the requested capability structure within the | |
338 | * device's PCI configuration space or 0 in case the device does not | |
339 | * support it. | |
340 | */ | |
341 | int pci_bus_find_ext_capability(struct pci_bus *bus, unsigned int devfn, | |
342 | int cap) | |
343 | { | |
344 | u32 header; | |
345 | int ttl; | |
346 | int pos = PCI_CFG_SPACE_SIZE; | |
347 | ||
348 | /* minimum 8 bytes per capability */ | |
349 | ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; | |
350 | ||
351 | if (!pci_bus_read_config_dword(bus, devfn, pos, &header)) | |
352 | return 0; | |
353 | if (header == 0xffffffff || header == 0) | |
354 | return 0; | |
355 | ||
356 | while (ttl-- > 0) { | |
357 | if (PCI_EXT_CAP_ID(header) == cap) | |
358 | return pos; | |
359 | ||
360 | pos = PCI_EXT_CAP_NEXT(header); | |
361 | if (pos < PCI_CFG_SPACE_SIZE) | |
362 | break; | |
363 | ||
364 | if (!pci_bus_read_config_dword(bus, devfn, pos, &header)) | |
365 | break; | |
366 | } | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
687d5fe3 ME |
371 | static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap) |
372 | { | |
373 | int rc, ttl = PCI_FIND_CAP_TTL; | |
374 | u8 cap, mask; | |
375 | ||
376 | if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST) | |
377 | mask = HT_3BIT_CAP_MASK; | |
378 | else | |
379 | mask = HT_5BIT_CAP_MASK; | |
380 | ||
381 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos, | |
382 | PCI_CAP_ID_HT, &ttl); | |
383 | while (pos) { | |
384 | rc = pci_read_config_byte(dev, pos + 3, &cap); | |
385 | if (rc != PCIBIOS_SUCCESSFUL) | |
386 | return 0; | |
387 | ||
388 | if ((cap & mask) == ht_cap) | |
389 | return pos; | |
390 | ||
47a4d5be BG |
391 | pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, |
392 | pos + PCI_CAP_LIST_NEXT, | |
687d5fe3 ME |
393 | PCI_CAP_ID_HT, &ttl); |
394 | } | |
395 | ||
396 | return 0; | |
397 | } | |
398 | /** | |
399 | * pci_find_next_ht_capability - query a device's Hypertransport capabilities | |
400 | * @dev: PCI device to query | |
401 | * @pos: Position from which to continue searching | |
402 | * @ht_cap: Hypertransport capability code | |
403 | * | |
404 | * To be used in conjunction with pci_find_ht_capability() to search for | |
405 | * all capabilities matching @ht_cap. @pos should always be a value returned | |
406 | * from pci_find_ht_capability(). | |
407 | * | |
408 | * NB. To be 100% safe against broken PCI devices, the caller should take | |
409 | * steps to avoid an infinite loop. | |
410 | */ | |
411 | int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap) | |
412 | { | |
413 | return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap); | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(pci_find_next_ht_capability); | |
416 | ||
417 | /** | |
418 | * pci_find_ht_capability - query a device's Hypertransport capabilities | |
419 | * @dev: PCI device to query | |
420 | * @ht_cap: Hypertransport capability code | |
421 | * | |
422 | * Tell if a device supports a given Hypertransport capability. | |
423 | * Returns an address within the device's PCI configuration space | |
424 | * or 0 in case the device does not support the request capability. | |
425 | * The address points to the PCI capability, of type PCI_CAP_ID_HT, | |
426 | * which has a Hypertransport capability matching @ht_cap. | |
427 | */ | |
428 | int pci_find_ht_capability(struct pci_dev *dev, int ht_cap) | |
429 | { | |
430 | int pos; | |
431 | ||
432 | pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type); | |
433 | if (pos) | |
434 | pos = __pci_find_next_ht_cap(dev, pos, ht_cap); | |
435 | ||
436 | return pos; | |
437 | } | |
438 | EXPORT_SYMBOL_GPL(pci_find_ht_capability); | |
439 | ||
1da177e4 LT |
440 | /** |
441 | * pci_find_parent_resource - return resource region of parent bus of given region | |
442 | * @dev: PCI device structure contains resources to be searched | |
443 | * @res: child resource record for which parent is sought | |
444 | * | |
445 | * For given resource region of given device, return the resource | |
446 | * region of parent bus the given region is contained in or where | |
447 | * it should be allocated from. | |
448 | */ | |
449 | struct resource * | |
450 | pci_find_parent_resource(const struct pci_dev *dev, struct resource *res) | |
451 | { | |
452 | const struct pci_bus *bus = dev->bus; | |
453 | int i; | |
89a74ecc | 454 | struct resource *best = NULL, *r; |
1da177e4 | 455 | |
89a74ecc | 456 | pci_bus_for_each_resource(bus, r, i) { |
1da177e4 LT |
457 | if (!r) |
458 | continue; | |
459 | if (res->start && !(res->start >= r->start && res->end <= r->end)) | |
460 | continue; /* Not contained */ | |
461 | if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM)) | |
462 | continue; /* Wrong type */ | |
463 | if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH)) | |
464 | return r; /* Exact match */ | |
8c8def26 LT |
465 | /* We can't insert a non-prefetch resource inside a prefetchable parent .. */ |
466 | if (r->flags & IORESOURCE_PREFETCH) | |
467 | continue; | |
468 | /* .. but we can put a prefetchable resource inside a non-prefetchable one */ | |
469 | if (!best) | |
470 | best = r; | |
1da177e4 LT |
471 | } |
472 | return best; | |
473 | } | |
474 | ||
064b53db JL |
475 | /** |
476 | * pci_restore_bars - restore a devices BAR values (e.g. after wake-up) | |
477 | * @dev: PCI device to have its BARs restored | |
478 | * | |
479 | * Restore the BAR values for a given device, so as to make it | |
480 | * accessible by its driver. | |
481 | */ | |
ad668599 | 482 | static void |
064b53db JL |
483 | pci_restore_bars(struct pci_dev *dev) |
484 | { | |
bc5f5a82 | 485 | int i; |
064b53db | 486 | |
bc5f5a82 | 487 | for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) |
14add80b | 488 | pci_update_resource(dev, i); |
064b53db JL |
489 | } |
490 | ||
961d9120 RW |
491 | static struct pci_platform_pm_ops *pci_platform_pm; |
492 | ||
493 | int pci_set_platform_pm(struct pci_platform_pm_ops *ops) | |
494 | { | |
eb9d0fe4 RW |
495 | if (!ops->is_manageable || !ops->set_state || !ops->choose_state |
496 | || !ops->sleep_wake || !ops->can_wakeup) | |
961d9120 RW |
497 | return -EINVAL; |
498 | pci_platform_pm = ops; | |
499 | return 0; | |
500 | } | |
501 | ||
502 | static inline bool platform_pci_power_manageable(struct pci_dev *dev) | |
503 | { | |
504 | return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false; | |
505 | } | |
506 | ||
507 | static inline int platform_pci_set_power_state(struct pci_dev *dev, | |
508 | pci_power_t t) | |
509 | { | |
510 | return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS; | |
511 | } | |
512 | ||
513 | static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev) | |
514 | { | |
515 | return pci_platform_pm ? | |
516 | pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR; | |
517 | } | |
8f7020d3 | 518 | |
eb9d0fe4 RW |
519 | static inline bool platform_pci_can_wakeup(struct pci_dev *dev) |
520 | { | |
521 | return pci_platform_pm ? pci_platform_pm->can_wakeup(dev) : false; | |
522 | } | |
523 | ||
524 | static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable) | |
525 | { | |
526 | return pci_platform_pm ? | |
527 | pci_platform_pm->sleep_wake(dev, enable) : -ENODEV; | |
528 | } | |
529 | ||
b67ea761 RW |
530 | static inline int platform_pci_run_wake(struct pci_dev *dev, bool enable) |
531 | { | |
532 | return pci_platform_pm ? | |
533 | pci_platform_pm->run_wake(dev, enable) : -ENODEV; | |
534 | } | |
535 | ||
1da177e4 | 536 | /** |
44e4e66e RW |
537 | * pci_raw_set_power_state - Use PCI PM registers to set the power state of |
538 | * given PCI device | |
539 | * @dev: PCI device to handle. | |
44e4e66e | 540 | * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. |
1da177e4 | 541 | * |
44e4e66e RW |
542 | * RETURN VALUE: |
543 | * -EINVAL if the requested state is invalid. | |
544 | * -EIO if device does not support PCI PM or its PM capabilities register has a | |
545 | * wrong version, or device doesn't support the requested state. | |
546 | * 0 if device already is in the requested state. | |
547 | * 0 if device's power state has been successfully changed. | |
1da177e4 | 548 | */ |
f00a20ef | 549 | static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state) |
1da177e4 | 550 | { |
337001b6 | 551 | u16 pmcsr; |
44e4e66e | 552 | bool need_restore = false; |
1da177e4 | 553 | |
4a865905 RW |
554 | /* Check if we're already there */ |
555 | if (dev->current_state == state) | |
556 | return 0; | |
557 | ||
337001b6 | 558 | if (!dev->pm_cap) |
cca03dec AL |
559 | return -EIO; |
560 | ||
44e4e66e RW |
561 | if (state < PCI_D0 || state > PCI_D3hot) |
562 | return -EINVAL; | |
563 | ||
1da177e4 LT |
564 | /* Validate current state: |
565 | * Can enter D0 from any state, but if we can only go deeper | |
566 | * to sleep if we're already in a low power state | |
567 | */ | |
4a865905 | 568 | if (state != PCI_D0 && dev->current_state <= PCI_D3cold |
44e4e66e | 569 | && dev->current_state > state) { |
80ccba11 BH |
570 | dev_err(&dev->dev, "invalid power transition " |
571 | "(from state %d to %d)\n", dev->current_state, state); | |
1da177e4 | 572 | return -EINVAL; |
44e4e66e | 573 | } |
1da177e4 | 574 | |
1da177e4 | 575 | /* check if this device supports the desired state */ |
337001b6 RW |
576 | if ((state == PCI_D1 && !dev->d1_support) |
577 | || (state == PCI_D2 && !dev->d2_support)) | |
3fe9d19f | 578 | return -EIO; |
1da177e4 | 579 | |
337001b6 | 580 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
064b53db | 581 | |
32a36585 | 582 | /* If we're (effectively) in D3, force entire word to 0. |
1da177e4 LT |
583 | * This doesn't affect PME_Status, disables PME_En, and |
584 | * sets PowerState to 0. | |
585 | */ | |
32a36585 | 586 | switch (dev->current_state) { |
d3535fbb JL |
587 | case PCI_D0: |
588 | case PCI_D1: | |
589 | case PCI_D2: | |
590 | pmcsr &= ~PCI_PM_CTRL_STATE_MASK; | |
591 | pmcsr |= state; | |
592 | break; | |
f62795f1 RW |
593 | case PCI_D3hot: |
594 | case PCI_D3cold: | |
32a36585 JL |
595 | case PCI_UNKNOWN: /* Boot-up */ |
596 | if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot | |
f00a20ef | 597 | && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) |
44e4e66e | 598 | need_restore = true; |
32a36585 | 599 | /* Fall-through: force to D0 */ |
32a36585 | 600 | default: |
d3535fbb | 601 | pmcsr = 0; |
32a36585 | 602 | break; |
1da177e4 LT |
603 | } |
604 | ||
605 | /* enter specified state */ | |
337001b6 | 606 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
1da177e4 LT |
607 | |
608 | /* Mandatory power management transition delays */ | |
609 | /* see PCI PM 1.1 5.6.1 table 18 */ | |
610 | if (state == PCI_D3hot || dev->current_state == PCI_D3hot) | |
1ae861e6 | 611 | pci_dev_d3_sleep(dev); |
1da177e4 | 612 | else if (state == PCI_D2 || dev->current_state == PCI_D2) |
aa8c6c93 | 613 | udelay(PCI_PM_D2_DELAY); |
1da177e4 | 614 | |
e13cdbd7 RW |
615 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
616 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); | |
617 | if (dev->current_state != state && printk_ratelimit()) | |
618 | dev_info(&dev->dev, "Refused to change power state, " | |
619 | "currently in D%d\n", dev->current_state); | |
064b53db JL |
620 | |
621 | /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT | |
622 | * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning | |
623 | * from D3hot to D0 _may_ perform an internal reset, thereby | |
624 | * going to "D0 Uninitialized" rather than "D0 Initialized". | |
625 | * For example, at least some versions of the 3c905B and the | |
626 | * 3c556B exhibit this behaviour. | |
627 | * | |
628 | * At least some laptop BIOSen (e.g. the Thinkpad T21) leave | |
629 | * devices in a D3hot state at boot. Consequently, we need to | |
630 | * restore at least the BARs so that the device will be | |
631 | * accessible to its driver. | |
632 | */ | |
633 | if (need_restore) | |
634 | pci_restore_bars(dev); | |
635 | ||
f00a20ef | 636 | if (dev->bus->self) |
7d715a6c SL |
637 | pcie_aspm_pm_state_change(dev->bus->self); |
638 | ||
1da177e4 LT |
639 | return 0; |
640 | } | |
641 | ||
44e4e66e RW |
642 | /** |
643 | * pci_update_current_state - Read PCI power state of given device from its | |
644 | * PCI PM registers and cache it | |
645 | * @dev: PCI device to handle. | |
f06fc0b6 | 646 | * @state: State to cache in case the device doesn't have the PM capability |
44e4e66e | 647 | */ |
73410429 | 648 | void pci_update_current_state(struct pci_dev *dev, pci_power_t state) |
44e4e66e | 649 | { |
337001b6 | 650 | if (dev->pm_cap) { |
44e4e66e RW |
651 | u16 pmcsr; |
652 | ||
337001b6 | 653 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
44e4e66e | 654 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); |
f06fc0b6 RW |
655 | } else { |
656 | dev->current_state = state; | |
44e4e66e RW |
657 | } |
658 | } | |
659 | ||
0e5dd46b RW |
660 | /** |
661 | * pci_platform_power_transition - Use platform to change device power state | |
662 | * @dev: PCI device to handle. | |
663 | * @state: State to put the device into. | |
664 | */ | |
665 | static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state) | |
666 | { | |
667 | int error; | |
668 | ||
669 | if (platform_pci_power_manageable(dev)) { | |
670 | error = platform_pci_set_power_state(dev, state); | |
671 | if (!error) | |
672 | pci_update_current_state(dev, state); | |
b51306c6 AH |
673 | /* Fall back to PCI_D0 if native PM is not supported */ |
674 | if (!dev->pm_cap) | |
675 | dev->current_state = PCI_D0; | |
0e5dd46b RW |
676 | } else { |
677 | error = -ENODEV; | |
678 | /* Fall back to PCI_D0 if native PM is not supported */ | |
b3bad72e RW |
679 | if (!dev->pm_cap) |
680 | dev->current_state = PCI_D0; | |
0e5dd46b RW |
681 | } |
682 | ||
683 | return error; | |
684 | } | |
685 | ||
686 | /** | |
687 | * __pci_start_power_transition - Start power transition of a PCI device | |
688 | * @dev: PCI device to handle. | |
689 | * @state: State to put the device into. | |
690 | */ | |
691 | static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state) | |
692 | { | |
693 | if (state == PCI_D0) | |
694 | pci_platform_power_transition(dev, PCI_D0); | |
695 | } | |
696 | ||
697 | /** | |
698 | * __pci_complete_power_transition - Complete power transition of a PCI device | |
699 | * @dev: PCI device to handle. | |
700 | * @state: State to put the device into. | |
701 | * | |
702 | * This function should not be called directly by device drivers. | |
703 | */ | |
704 | int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state) | |
705 | { | |
cc2893b6 | 706 | return state >= PCI_D0 ? |
0e5dd46b RW |
707 | pci_platform_power_transition(dev, state) : -EINVAL; |
708 | } | |
709 | EXPORT_SYMBOL_GPL(__pci_complete_power_transition); | |
710 | ||
44e4e66e RW |
711 | /** |
712 | * pci_set_power_state - Set the power state of a PCI device | |
713 | * @dev: PCI device to handle. | |
714 | * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. | |
715 | * | |
877d0310 | 716 | * Transition a device to a new power state, using the platform firmware and/or |
44e4e66e RW |
717 | * the device's PCI PM registers. |
718 | * | |
719 | * RETURN VALUE: | |
720 | * -EINVAL if the requested state is invalid. | |
721 | * -EIO if device does not support PCI PM or its PM capabilities register has a | |
722 | * wrong version, or device doesn't support the requested state. | |
723 | * 0 if device already is in the requested state. | |
724 | * 0 if device's power state has been successfully changed. | |
725 | */ | |
726 | int pci_set_power_state(struct pci_dev *dev, pci_power_t state) | |
727 | { | |
337001b6 | 728 | int error; |
44e4e66e RW |
729 | |
730 | /* bound the state we're entering */ | |
731 | if (state > PCI_D3hot) | |
732 | state = PCI_D3hot; | |
733 | else if (state < PCI_D0) | |
734 | state = PCI_D0; | |
735 | else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev)) | |
736 | /* | |
737 | * If the device or the parent bridge do not support PCI PM, | |
738 | * ignore the request if we're doing anything other than putting | |
739 | * it into D0 (which would only happen on boot). | |
740 | */ | |
741 | return 0; | |
742 | ||
0e5dd46b RW |
743 | __pci_start_power_transition(dev, state); |
744 | ||
979b1791 AC |
745 | /* This device is quirked not to be put into D3, so |
746 | don't put it in D3 */ | |
747 | if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) | |
748 | return 0; | |
44e4e66e | 749 | |
f00a20ef | 750 | error = pci_raw_set_power_state(dev, state); |
44e4e66e | 751 | |
0e5dd46b RW |
752 | if (!__pci_complete_power_transition(dev, state)) |
753 | error = 0; | |
1a680b7c NC |
754 | /* |
755 | * When aspm_policy is "powersave" this call ensures | |
756 | * that ASPM is configured. | |
757 | */ | |
758 | if (!error && dev->bus->self) | |
759 | pcie_aspm_powersave_config_link(dev->bus->self); | |
44e4e66e RW |
760 | |
761 | return error; | |
762 | } | |
763 | ||
1da177e4 LT |
764 | /** |
765 | * pci_choose_state - Choose the power state of a PCI device | |
766 | * @dev: PCI device to be suspended | |
767 | * @state: target sleep state for the whole system. This is the value | |
768 | * that is passed to suspend() function. | |
769 | * | |
770 | * Returns PCI power state suitable for given device and given system | |
771 | * message. | |
772 | */ | |
773 | ||
774 | pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state) | |
775 | { | |
ab826ca4 | 776 | pci_power_t ret; |
0f64474b | 777 | |
1da177e4 LT |
778 | if (!pci_find_capability(dev, PCI_CAP_ID_PM)) |
779 | return PCI_D0; | |
780 | ||
961d9120 RW |
781 | ret = platform_pci_choose_state(dev); |
782 | if (ret != PCI_POWER_ERROR) | |
783 | return ret; | |
ca078bae PM |
784 | |
785 | switch (state.event) { | |
786 | case PM_EVENT_ON: | |
787 | return PCI_D0; | |
788 | case PM_EVENT_FREEZE: | |
b887d2e6 DB |
789 | case PM_EVENT_PRETHAW: |
790 | /* REVISIT both freeze and pre-thaw "should" use D0 */ | |
ca078bae | 791 | case PM_EVENT_SUSPEND: |
3a2d5b70 | 792 | case PM_EVENT_HIBERNATE: |
ca078bae | 793 | return PCI_D3hot; |
1da177e4 | 794 | default: |
80ccba11 BH |
795 | dev_info(&dev->dev, "unrecognized suspend event %d\n", |
796 | state.event); | |
1da177e4 LT |
797 | BUG(); |
798 | } | |
799 | return PCI_D0; | |
800 | } | |
801 | ||
802 | EXPORT_SYMBOL(pci_choose_state); | |
803 | ||
89858517 YZ |
804 | #define PCI_EXP_SAVE_REGS 7 |
805 | ||
1b6b8ce2 YZ |
806 | #define pcie_cap_has_devctl(type, flags) 1 |
807 | #define pcie_cap_has_lnkctl(type, flags) \ | |
808 | ((flags & PCI_EXP_FLAGS_VERS) > 1 || \ | |
809 | (type == PCI_EXP_TYPE_ROOT_PORT || \ | |
810 | type == PCI_EXP_TYPE_ENDPOINT || \ | |
811 | type == PCI_EXP_TYPE_LEG_END)) | |
812 | #define pcie_cap_has_sltctl(type, flags) \ | |
813 | ((flags & PCI_EXP_FLAGS_VERS) > 1 || \ | |
814 | ((type == PCI_EXP_TYPE_ROOT_PORT) || \ | |
815 | (type == PCI_EXP_TYPE_DOWNSTREAM && \ | |
816 | (flags & PCI_EXP_FLAGS_SLOT)))) | |
817 | #define pcie_cap_has_rtctl(type, flags) \ | |
818 | ((flags & PCI_EXP_FLAGS_VERS) > 1 || \ | |
819 | (type == PCI_EXP_TYPE_ROOT_PORT || \ | |
820 | type == PCI_EXP_TYPE_RC_EC)) | |
821 | #define pcie_cap_has_devctl2(type, flags) \ | |
822 | ((flags & PCI_EXP_FLAGS_VERS) > 1) | |
823 | #define pcie_cap_has_lnkctl2(type, flags) \ | |
824 | ((flags & PCI_EXP_FLAGS_VERS) > 1) | |
825 | #define pcie_cap_has_sltctl2(type, flags) \ | |
826 | ((flags & PCI_EXP_FLAGS_VERS) > 1) | |
827 | ||
34a4876e YL |
828 | static struct pci_cap_saved_state *pci_find_saved_cap( |
829 | struct pci_dev *pci_dev, char cap) | |
830 | { | |
831 | struct pci_cap_saved_state *tmp; | |
832 | struct hlist_node *pos; | |
833 | ||
834 | hlist_for_each_entry(tmp, pos, &pci_dev->saved_cap_space, next) { | |
835 | if (tmp->cap.cap_nr == cap) | |
836 | return tmp; | |
837 | } | |
838 | return NULL; | |
839 | } | |
840 | ||
b56a5a23 MT |
841 | static int pci_save_pcie_state(struct pci_dev *dev) |
842 | { | |
843 | int pos, i = 0; | |
844 | struct pci_cap_saved_state *save_state; | |
845 | u16 *cap; | |
1b6b8ce2 | 846 | u16 flags; |
b56a5a23 | 847 | |
06a1cbaf KK |
848 | pos = pci_pcie_cap(dev); |
849 | if (!pos) | |
b56a5a23 MT |
850 | return 0; |
851 | ||
9f35575d | 852 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); |
b56a5a23 | 853 | if (!save_state) { |
e496b617 | 854 | dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
b56a5a23 MT |
855 | return -ENOMEM; |
856 | } | |
24a4742f | 857 | cap = (u16 *)&save_state->cap.data[0]; |
b56a5a23 | 858 | |
1b6b8ce2 YZ |
859 | pci_read_config_word(dev, pos + PCI_EXP_FLAGS, &flags); |
860 | ||
861 | if (pcie_cap_has_devctl(dev->pcie_type, flags)) | |
862 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]); | |
863 | if (pcie_cap_has_lnkctl(dev->pcie_type, flags)) | |
864 | pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]); | |
865 | if (pcie_cap_has_sltctl(dev->pcie_type, flags)) | |
866 | pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]); | |
867 | if (pcie_cap_has_rtctl(dev->pcie_type, flags)) | |
868 | pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]); | |
869 | if (pcie_cap_has_devctl2(dev->pcie_type, flags)) | |
870 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &cap[i++]); | |
871 | if (pcie_cap_has_lnkctl2(dev->pcie_type, flags)) | |
872 | pci_read_config_word(dev, pos + PCI_EXP_LNKCTL2, &cap[i++]); | |
873 | if (pcie_cap_has_sltctl2(dev->pcie_type, flags)) | |
874 | pci_read_config_word(dev, pos + PCI_EXP_SLTCTL2, &cap[i++]); | |
63f4898a | 875 | |
b56a5a23 MT |
876 | return 0; |
877 | } | |
878 | ||
879 | static void pci_restore_pcie_state(struct pci_dev *dev) | |
880 | { | |
881 | int i = 0, pos; | |
882 | struct pci_cap_saved_state *save_state; | |
883 | u16 *cap; | |
1b6b8ce2 | 884 | u16 flags; |
b56a5a23 MT |
885 | |
886 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP); | |
887 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
888 | if (!save_state || pos <= 0) | |
889 | return; | |
24a4742f | 890 | cap = (u16 *)&save_state->cap.data[0]; |
b56a5a23 | 891 | |
1b6b8ce2 YZ |
892 | pci_read_config_word(dev, pos + PCI_EXP_FLAGS, &flags); |
893 | ||
894 | if (pcie_cap_has_devctl(dev->pcie_type, flags)) | |
895 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]); | |
896 | if (pcie_cap_has_lnkctl(dev->pcie_type, flags)) | |
897 | pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]); | |
898 | if (pcie_cap_has_sltctl(dev->pcie_type, flags)) | |
899 | pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]); | |
900 | if (pcie_cap_has_rtctl(dev->pcie_type, flags)) | |
901 | pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]); | |
902 | if (pcie_cap_has_devctl2(dev->pcie_type, flags)) | |
903 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, cap[i++]); | |
904 | if (pcie_cap_has_lnkctl2(dev->pcie_type, flags)) | |
905 | pci_write_config_word(dev, pos + PCI_EXP_LNKCTL2, cap[i++]); | |
906 | if (pcie_cap_has_sltctl2(dev->pcie_type, flags)) | |
907 | pci_write_config_word(dev, pos + PCI_EXP_SLTCTL2, cap[i++]); | |
b56a5a23 MT |
908 | } |
909 | ||
cc692a5f SH |
910 | |
911 | static int pci_save_pcix_state(struct pci_dev *dev) | |
912 | { | |
63f4898a | 913 | int pos; |
cc692a5f | 914 | struct pci_cap_saved_state *save_state; |
cc692a5f SH |
915 | |
916 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
917 | if (pos <= 0) | |
918 | return 0; | |
919 | ||
f34303de | 920 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); |
cc692a5f | 921 | if (!save_state) { |
e496b617 | 922 | dev_err(&dev->dev, "buffer not found in %s\n", __func__); |
cc692a5f SH |
923 | return -ENOMEM; |
924 | } | |
cc692a5f | 925 | |
24a4742f AW |
926 | pci_read_config_word(dev, pos + PCI_X_CMD, |
927 | (u16 *)save_state->cap.data); | |
63f4898a | 928 | |
cc692a5f SH |
929 | return 0; |
930 | } | |
931 | ||
932 | static void pci_restore_pcix_state(struct pci_dev *dev) | |
933 | { | |
934 | int i = 0, pos; | |
935 | struct pci_cap_saved_state *save_state; | |
936 | u16 *cap; | |
937 | ||
938 | save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX); | |
939 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
940 | if (!save_state || pos <= 0) | |
941 | return; | |
24a4742f | 942 | cap = (u16 *)&save_state->cap.data[0]; |
cc692a5f SH |
943 | |
944 | pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]); | |
cc692a5f SH |
945 | } |
946 | ||
947 | ||
1da177e4 LT |
948 | /** |
949 | * pci_save_state - save the PCI configuration space of a device before suspending | |
950 | * @dev: - PCI device that we're dealing with | |
1da177e4 LT |
951 | */ |
952 | int | |
953 | pci_save_state(struct pci_dev *dev) | |
954 | { | |
955 | int i; | |
956 | /* XXX: 100% dword access ok here? */ | |
957 | for (i = 0; i < 16; i++) | |
9e0b5b2c | 958 | pci_read_config_dword(dev, i * 4, &dev->saved_config_space[i]); |
aa8c6c93 | 959 | dev->state_saved = true; |
b56a5a23 MT |
960 | if ((i = pci_save_pcie_state(dev)) != 0) |
961 | return i; | |
cc692a5f SH |
962 | if ((i = pci_save_pcix_state(dev)) != 0) |
963 | return i; | |
1da177e4 LT |
964 | return 0; |
965 | } | |
966 | ||
967 | /** | |
968 | * pci_restore_state - Restore the saved state of a PCI device | |
969 | * @dev: - PCI device that we're dealing with | |
1da177e4 | 970 | */ |
1d3c16a8 | 971 | void pci_restore_state(struct pci_dev *dev) |
1da177e4 LT |
972 | { |
973 | int i; | |
b4482a4b | 974 | u32 val; |
26f41062 | 975 | int tries; |
1da177e4 | 976 | |
c82f63e4 | 977 | if (!dev->state_saved) |
1d3c16a8 | 978 | return; |
4b77b0a2 | 979 | |
b56a5a23 MT |
980 | /* PCI Express register must be restored first */ |
981 | pci_restore_pcie_state(dev); | |
1900ca13 | 982 | pci_restore_ats_state(dev); |
b56a5a23 | 983 | |
8b8c8d28 YL |
984 | /* |
985 | * The Base Address register should be programmed before the command | |
986 | * register(s) | |
987 | */ | |
988 | for (i = 15; i >= 0; i--) { | |
04d9c1a1 | 989 | pci_read_config_dword(dev, i * 4, &val); |
26f41062 KA |
990 | tries = 10; |
991 | while (tries && val != dev->saved_config_space[i]) { | |
85b8582d | 992 | dev_dbg(&dev->dev, "restoring config " |
80ccba11 BH |
993 | "space at offset %#x (was %#x, writing %#x)\n", |
994 | i, val, (int)dev->saved_config_space[i]); | |
04d9c1a1 DJ |
995 | pci_write_config_dword(dev,i * 4, |
996 | dev->saved_config_space[i]); | |
26f41062 KA |
997 | pci_read_config_dword(dev, i * 4, &val); |
998 | mdelay(10); | |
999 | tries--; | |
04d9c1a1 DJ |
1000 | } |
1001 | } | |
cc692a5f | 1002 | pci_restore_pcix_state(dev); |
41017f0c | 1003 | pci_restore_msi_state(dev); |
8c5cdb6a | 1004 | pci_restore_iov_state(dev); |
8fed4b65 | 1005 | |
4b77b0a2 | 1006 | dev->state_saved = false; |
1da177e4 LT |
1007 | } |
1008 | ||
ffbdd3f7 AW |
1009 | struct pci_saved_state { |
1010 | u32 config_space[16]; | |
1011 | struct pci_cap_saved_data cap[0]; | |
1012 | }; | |
1013 | ||
1014 | /** | |
1015 | * pci_store_saved_state - Allocate and return an opaque struct containing | |
1016 | * the device saved state. | |
1017 | * @dev: PCI device that we're dealing with | |
1018 | * | |
1019 | * Rerturn NULL if no state or error. | |
1020 | */ | |
1021 | struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev) | |
1022 | { | |
1023 | struct pci_saved_state *state; | |
1024 | struct pci_cap_saved_state *tmp; | |
1025 | struct pci_cap_saved_data *cap; | |
1026 | struct hlist_node *pos; | |
1027 | size_t size; | |
1028 | ||
1029 | if (!dev->state_saved) | |
1030 | return NULL; | |
1031 | ||
1032 | size = sizeof(*state) + sizeof(struct pci_cap_saved_data); | |
1033 | ||
1034 | hlist_for_each_entry(tmp, pos, &dev->saved_cap_space, next) | |
1035 | size += sizeof(struct pci_cap_saved_data) + tmp->cap.size; | |
1036 | ||
1037 | state = kzalloc(size, GFP_KERNEL); | |
1038 | if (!state) | |
1039 | return NULL; | |
1040 | ||
1041 | memcpy(state->config_space, dev->saved_config_space, | |
1042 | sizeof(state->config_space)); | |
1043 | ||
1044 | cap = state->cap; | |
1045 | hlist_for_each_entry(tmp, pos, &dev->saved_cap_space, next) { | |
1046 | size_t len = sizeof(struct pci_cap_saved_data) + tmp->cap.size; | |
1047 | memcpy(cap, &tmp->cap, len); | |
1048 | cap = (struct pci_cap_saved_data *)((u8 *)cap + len); | |
1049 | } | |
1050 | /* Empty cap_save terminates list */ | |
1051 | ||
1052 | return state; | |
1053 | } | |
1054 | EXPORT_SYMBOL_GPL(pci_store_saved_state); | |
1055 | ||
1056 | /** | |
1057 | * pci_load_saved_state - Reload the provided save state into struct pci_dev. | |
1058 | * @dev: PCI device that we're dealing with | |
1059 | * @state: Saved state returned from pci_store_saved_state() | |
1060 | */ | |
1061 | int pci_load_saved_state(struct pci_dev *dev, struct pci_saved_state *state) | |
1062 | { | |
1063 | struct pci_cap_saved_data *cap; | |
1064 | ||
1065 | dev->state_saved = false; | |
1066 | ||
1067 | if (!state) | |
1068 | return 0; | |
1069 | ||
1070 | memcpy(dev->saved_config_space, state->config_space, | |
1071 | sizeof(state->config_space)); | |
1072 | ||
1073 | cap = state->cap; | |
1074 | while (cap->size) { | |
1075 | struct pci_cap_saved_state *tmp; | |
1076 | ||
1077 | tmp = pci_find_saved_cap(dev, cap->cap_nr); | |
1078 | if (!tmp || tmp->cap.size != cap->size) | |
1079 | return -EINVAL; | |
1080 | ||
1081 | memcpy(tmp->cap.data, cap->data, tmp->cap.size); | |
1082 | cap = (struct pci_cap_saved_data *)((u8 *)cap + | |
1083 | sizeof(struct pci_cap_saved_data) + cap->size); | |
1084 | } | |
1085 | ||
1086 | dev->state_saved = true; | |
1087 | return 0; | |
1088 | } | |
1089 | EXPORT_SYMBOL_GPL(pci_load_saved_state); | |
1090 | ||
1091 | /** | |
1092 | * pci_load_and_free_saved_state - Reload the save state pointed to by state, | |
1093 | * and free the memory allocated for it. | |
1094 | * @dev: PCI device that we're dealing with | |
1095 | * @state: Pointer to saved state returned from pci_store_saved_state() | |
1096 | */ | |
1097 | int pci_load_and_free_saved_state(struct pci_dev *dev, | |
1098 | struct pci_saved_state **state) | |
1099 | { | |
1100 | int ret = pci_load_saved_state(dev, *state); | |
1101 | kfree(*state); | |
1102 | *state = NULL; | |
1103 | return ret; | |
1104 | } | |
1105 | EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state); | |
1106 | ||
38cc1302 HS |
1107 | static int do_pci_enable_device(struct pci_dev *dev, int bars) |
1108 | { | |
1109 | int err; | |
1110 | ||
1111 | err = pci_set_power_state(dev, PCI_D0); | |
1112 | if (err < 0 && err != -EIO) | |
1113 | return err; | |
1114 | err = pcibios_enable_device(dev, bars); | |
1115 | if (err < 0) | |
1116 | return err; | |
1117 | pci_fixup_device(pci_fixup_enable, dev); | |
1118 | ||
1119 | return 0; | |
1120 | } | |
1121 | ||
1122 | /** | |
0b62e13b | 1123 | * pci_reenable_device - Resume abandoned device |
38cc1302 HS |
1124 | * @dev: PCI device to be resumed |
1125 | * | |
1126 | * Note this function is a backend of pci_default_resume and is not supposed | |
1127 | * to be called by normal code, write proper resume handler and use it instead. | |
1128 | */ | |
0b62e13b | 1129 | int pci_reenable_device(struct pci_dev *dev) |
38cc1302 | 1130 | { |
296ccb08 | 1131 | if (pci_is_enabled(dev)) |
38cc1302 HS |
1132 | return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1); |
1133 | return 0; | |
1134 | } | |
1135 | ||
b718989d BH |
1136 | static int __pci_enable_device_flags(struct pci_dev *dev, |
1137 | resource_size_t flags) | |
1da177e4 LT |
1138 | { |
1139 | int err; | |
b718989d | 1140 | int i, bars = 0; |
1da177e4 | 1141 | |
97c145f7 JB |
1142 | /* |
1143 | * Power state could be unknown at this point, either due to a fresh | |
1144 | * boot or a device removal call. So get the current power state | |
1145 | * so that things like MSI message writing will behave as expected | |
1146 | * (e.g. if the device really is in D0 at enable time). | |
1147 | */ | |
1148 | if (dev->pm_cap) { | |
1149 | u16 pmcsr; | |
1150 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); | |
1151 | dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); | |
1152 | } | |
1153 | ||
9fb625c3 HS |
1154 | if (atomic_add_return(1, &dev->enable_cnt) > 1) |
1155 | return 0; /* already enabled */ | |
1156 | ||
497f16f2 YL |
1157 | /* only skip sriov related */ |
1158 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) | |
1159 | if (dev->resource[i].flags & flags) | |
1160 | bars |= (1 << i); | |
1161 | for (i = PCI_BRIDGE_RESOURCES; i < DEVICE_COUNT_RESOURCE; i++) | |
b718989d BH |
1162 | if (dev->resource[i].flags & flags) |
1163 | bars |= (1 << i); | |
1164 | ||
38cc1302 | 1165 | err = do_pci_enable_device(dev, bars); |
95a62965 | 1166 | if (err < 0) |
38cc1302 | 1167 | atomic_dec(&dev->enable_cnt); |
9fb625c3 | 1168 | return err; |
1da177e4 LT |
1169 | } |
1170 | ||
b718989d BH |
1171 | /** |
1172 | * pci_enable_device_io - Initialize a device for use with IO space | |
1173 | * @dev: PCI device to be initialized | |
1174 | * | |
1175 | * Initialize device before it's used by a driver. Ask low-level code | |
1176 | * to enable I/O resources. Wake up the device if it was suspended. | |
1177 | * Beware, this function can fail. | |
1178 | */ | |
1179 | int pci_enable_device_io(struct pci_dev *dev) | |
1180 | { | |
1181 | return __pci_enable_device_flags(dev, IORESOURCE_IO); | |
1182 | } | |
1183 | ||
1184 | /** | |
1185 | * pci_enable_device_mem - Initialize a device for use with Memory space | |
1186 | * @dev: PCI device to be initialized | |
1187 | * | |
1188 | * Initialize device before it's used by a driver. Ask low-level code | |
1189 | * to enable Memory resources. Wake up the device if it was suspended. | |
1190 | * Beware, this function can fail. | |
1191 | */ | |
1192 | int pci_enable_device_mem(struct pci_dev *dev) | |
1193 | { | |
1194 | return __pci_enable_device_flags(dev, IORESOURCE_MEM); | |
1195 | } | |
1196 | ||
bae94d02 IPG |
1197 | /** |
1198 | * pci_enable_device - Initialize device before it's used by a driver. | |
1199 | * @dev: PCI device to be initialized | |
1200 | * | |
1201 | * Initialize device before it's used by a driver. Ask low-level code | |
1202 | * to enable I/O and memory. Wake up the device if it was suspended. | |
1203 | * Beware, this function can fail. | |
1204 | * | |
1205 | * Note we don't actually enable the device many times if we call | |
1206 | * this function repeatedly (we just increment the count). | |
1207 | */ | |
1208 | int pci_enable_device(struct pci_dev *dev) | |
1209 | { | |
b718989d | 1210 | return __pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO); |
bae94d02 IPG |
1211 | } |
1212 | ||
9ac7849e TH |
1213 | /* |
1214 | * Managed PCI resources. This manages device on/off, intx/msi/msix | |
1215 | * on/off and BAR regions. pci_dev itself records msi/msix status, so | |
1216 | * there's no need to track it separately. pci_devres is initialized | |
1217 | * when a device is enabled using managed PCI device enable interface. | |
1218 | */ | |
1219 | struct pci_devres { | |
7f375f32 TH |
1220 | unsigned int enabled:1; |
1221 | unsigned int pinned:1; | |
9ac7849e TH |
1222 | unsigned int orig_intx:1; |
1223 | unsigned int restore_intx:1; | |
1224 | u32 region_mask; | |
1225 | }; | |
1226 | ||
1227 | static void pcim_release(struct device *gendev, void *res) | |
1228 | { | |
1229 | struct pci_dev *dev = container_of(gendev, struct pci_dev, dev); | |
1230 | struct pci_devres *this = res; | |
1231 | int i; | |
1232 | ||
1233 | if (dev->msi_enabled) | |
1234 | pci_disable_msi(dev); | |
1235 | if (dev->msix_enabled) | |
1236 | pci_disable_msix(dev); | |
1237 | ||
1238 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) | |
1239 | if (this->region_mask & (1 << i)) | |
1240 | pci_release_region(dev, i); | |
1241 | ||
1242 | if (this->restore_intx) | |
1243 | pci_intx(dev, this->orig_intx); | |
1244 | ||
7f375f32 | 1245 | if (this->enabled && !this->pinned) |
9ac7849e TH |
1246 | pci_disable_device(dev); |
1247 | } | |
1248 | ||
1249 | static struct pci_devres * get_pci_dr(struct pci_dev *pdev) | |
1250 | { | |
1251 | struct pci_devres *dr, *new_dr; | |
1252 | ||
1253 | dr = devres_find(&pdev->dev, pcim_release, NULL, NULL); | |
1254 | if (dr) | |
1255 | return dr; | |
1256 | ||
1257 | new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL); | |
1258 | if (!new_dr) | |
1259 | return NULL; | |
1260 | return devres_get(&pdev->dev, new_dr, NULL, NULL); | |
1261 | } | |
1262 | ||
1263 | static struct pci_devres * find_pci_dr(struct pci_dev *pdev) | |
1264 | { | |
1265 | if (pci_is_managed(pdev)) | |
1266 | return devres_find(&pdev->dev, pcim_release, NULL, NULL); | |
1267 | return NULL; | |
1268 | } | |
1269 | ||
1270 | /** | |
1271 | * pcim_enable_device - Managed pci_enable_device() | |
1272 | * @pdev: PCI device to be initialized | |
1273 | * | |
1274 | * Managed pci_enable_device(). | |
1275 | */ | |
1276 | int pcim_enable_device(struct pci_dev *pdev) | |
1277 | { | |
1278 | struct pci_devres *dr; | |
1279 | int rc; | |
1280 | ||
1281 | dr = get_pci_dr(pdev); | |
1282 | if (unlikely(!dr)) | |
1283 | return -ENOMEM; | |
b95d58ea TH |
1284 | if (dr->enabled) |
1285 | return 0; | |
9ac7849e TH |
1286 | |
1287 | rc = pci_enable_device(pdev); | |
1288 | if (!rc) { | |
1289 | pdev->is_managed = 1; | |
7f375f32 | 1290 | dr->enabled = 1; |
9ac7849e TH |
1291 | } |
1292 | return rc; | |
1293 | } | |
1294 | ||
1295 | /** | |
1296 | * pcim_pin_device - Pin managed PCI device | |
1297 | * @pdev: PCI device to pin | |
1298 | * | |
1299 | * Pin managed PCI device @pdev. Pinned device won't be disabled on | |
1300 | * driver detach. @pdev must have been enabled with | |
1301 | * pcim_enable_device(). | |
1302 | */ | |
1303 | void pcim_pin_device(struct pci_dev *pdev) | |
1304 | { | |
1305 | struct pci_devres *dr; | |
1306 | ||
1307 | dr = find_pci_dr(pdev); | |
7f375f32 | 1308 | WARN_ON(!dr || !dr->enabled); |
9ac7849e | 1309 | if (dr) |
7f375f32 | 1310 | dr->pinned = 1; |
9ac7849e TH |
1311 | } |
1312 | ||
1da177e4 LT |
1313 | /** |
1314 | * pcibios_disable_device - disable arch specific PCI resources for device dev | |
1315 | * @dev: the PCI device to disable | |
1316 | * | |
1317 | * Disables architecture specific PCI resources for the device. This | |
1318 | * is the default implementation. Architecture implementations can | |
1319 | * override this. | |
1320 | */ | |
1321 | void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {} | |
1322 | ||
fa58d305 RW |
1323 | static void do_pci_disable_device(struct pci_dev *dev) |
1324 | { | |
1325 | u16 pci_command; | |
1326 | ||
1327 | pci_read_config_word(dev, PCI_COMMAND, &pci_command); | |
1328 | if (pci_command & PCI_COMMAND_MASTER) { | |
1329 | pci_command &= ~PCI_COMMAND_MASTER; | |
1330 | pci_write_config_word(dev, PCI_COMMAND, pci_command); | |
1331 | } | |
1332 | ||
1333 | pcibios_disable_device(dev); | |
1334 | } | |
1335 | ||
1336 | /** | |
1337 | * pci_disable_enabled_device - Disable device without updating enable_cnt | |
1338 | * @dev: PCI device to disable | |
1339 | * | |
1340 | * NOTE: This function is a backend of PCI power management routines and is | |
1341 | * not supposed to be called drivers. | |
1342 | */ | |
1343 | void pci_disable_enabled_device(struct pci_dev *dev) | |
1344 | { | |
296ccb08 | 1345 | if (pci_is_enabled(dev)) |
fa58d305 RW |
1346 | do_pci_disable_device(dev); |
1347 | } | |
1348 | ||
1da177e4 LT |
1349 | /** |
1350 | * pci_disable_device - Disable PCI device after use | |
1351 | * @dev: PCI device to be disabled | |
1352 | * | |
1353 | * Signal to the system that the PCI device is not in use by the system | |
1354 | * anymore. This only involves disabling PCI bus-mastering, if active. | |
bae94d02 IPG |
1355 | * |
1356 | * Note we don't actually disable the device until all callers of | |
ee6583f6 | 1357 | * pci_enable_device() have called pci_disable_device(). |
1da177e4 LT |
1358 | */ |
1359 | void | |
1360 | pci_disable_device(struct pci_dev *dev) | |
1361 | { | |
9ac7849e | 1362 | struct pci_devres *dr; |
99dc804d | 1363 | |
9ac7849e TH |
1364 | dr = find_pci_dr(dev); |
1365 | if (dr) | |
7f375f32 | 1366 | dr->enabled = 0; |
9ac7849e | 1367 | |
bae94d02 IPG |
1368 | if (atomic_sub_return(1, &dev->enable_cnt) != 0) |
1369 | return; | |
1370 | ||
fa58d305 | 1371 | do_pci_disable_device(dev); |
1da177e4 | 1372 | |
fa58d305 | 1373 | dev->is_busmaster = 0; |
1da177e4 LT |
1374 | } |
1375 | ||
f7bdd12d BK |
1376 | /** |
1377 | * pcibios_set_pcie_reset_state - set reset state for device dev | |
45e829ea | 1378 | * @dev: the PCIe device reset |
f7bdd12d BK |
1379 | * @state: Reset state to enter into |
1380 | * | |
1381 | * | |
45e829ea | 1382 | * Sets the PCIe reset state for the device. This is the default |
f7bdd12d BK |
1383 | * implementation. Architecture implementations can override this. |
1384 | */ | |
1385 | int __attribute__ ((weak)) pcibios_set_pcie_reset_state(struct pci_dev *dev, | |
1386 | enum pcie_reset_state state) | |
1387 | { | |
1388 | return -EINVAL; | |
1389 | } | |
1390 | ||
1391 | /** | |
1392 | * pci_set_pcie_reset_state - set reset state for device dev | |
45e829ea | 1393 | * @dev: the PCIe device reset |
f7bdd12d BK |
1394 | * @state: Reset state to enter into |
1395 | * | |
1396 | * | |
1397 | * Sets the PCI reset state for the device. | |
1398 | */ | |
1399 | int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state) | |
1400 | { | |
1401 | return pcibios_set_pcie_reset_state(dev, state); | |
1402 | } | |
1403 | ||
58ff4633 RW |
1404 | /** |
1405 | * pci_check_pme_status - Check if given device has generated PME. | |
1406 | * @dev: Device to check. | |
1407 | * | |
1408 | * Check the PME status of the device and if set, clear it and clear PME enable | |
1409 | * (if set). Return 'true' if PME status and PME enable were both set or | |
1410 | * 'false' otherwise. | |
1411 | */ | |
1412 | bool pci_check_pme_status(struct pci_dev *dev) | |
1413 | { | |
1414 | int pmcsr_pos; | |
1415 | u16 pmcsr; | |
1416 | bool ret = false; | |
1417 | ||
1418 | if (!dev->pm_cap) | |
1419 | return false; | |
1420 | ||
1421 | pmcsr_pos = dev->pm_cap + PCI_PM_CTRL; | |
1422 | pci_read_config_word(dev, pmcsr_pos, &pmcsr); | |
1423 | if (!(pmcsr & PCI_PM_CTRL_PME_STATUS)) | |
1424 | return false; | |
1425 | ||
1426 | /* Clear PME status. */ | |
1427 | pmcsr |= PCI_PM_CTRL_PME_STATUS; | |
1428 | if (pmcsr & PCI_PM_CTRL_PME_ENABLE) { | |
1429 | /* Disable PME to avoid interrupt flood. */ | |
1430 | pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; | |
1431 | ret = true; | |
1432 | } | |
1433 | ||
1434 | pci_write_config_word(dev, pmcsr_pos, pmcsr); | |
1435 | ||
1436 | return ret; | |
1437 | } | |
1438 | ||
b67ea761 RW |
1439 | /** |
1440 | * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set. | |
1441 | * @dev: Device to handle. | |
379021d5 | 1442 | * @pme_poll_reset: Whether or not to reset the device's pme_poll flag. |
b67ea761 RW |
1443 | * |
1444 | * Check if @dev has generated PME and queue a resume request for it in that | |
1445 | * case. | |
1446 | */ | |
379021d5 | 1447 | static int pci_pme_wakeup(struct pci_dev *dev, void *pme_poll_reset) |
b67ea761 | 1448 | { |
379021d5 RW |
1449 | if (pme_poll_reset && dev->pme_poll) |
1450 | dev->pme_poll = false; | |
1451 | ||
c125e96f | 1452 | if (pci_check_pme_status(dev)) { |
c125e96f | 1453 | pci_wakeup_event(dev); |
0f953bf6 | 1454 | pm_request_resume(&dev->dev); |
c125e96f | 1455 | } |
b67ea761 RW |
1456 | return 0; |
1457 | } | |
1458 | ||
1459 | /** | |
1460 | * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary. | |
1461 | * @bus: Top bus of the subtree to walk. | |
1462 | */ | |
1463 | void pci_pme_wakeup_bus(struct pci_bus *bus) | |
1464 | { | |
1465 | if (bus) | |
379021d5 | 1466 | pci_walk_bus(bus, pci_pme_wakeup, (void *)true); |
b67ea761 RW |
1467 | } |
1468 | ||
eb9d0fe4 RW |
1469 | /** |
1470 | * pci_pme_capable - check the capability of PCI device to generate PME# | |
1471 | * @dev: PCI device to handle. | |
eb9d0fe4 RW |
1472 | * @state: PCI state from which device will issue PME#. |
1473 | */ | |
e5899e1b | 1474 | bool pci_pme_capable(struct pci_dev *dev, pci_power_t state) |
eb9d0fe4 | 1475 | { |
337001b6 | 1476 | if (!dev->pm_cap) |
eb9d0fe4 RW |
1477 | return false; |
1478 | ||
337001b6 | 1479 | return !!(dev->pme_support & (1 << state)); |
eb9d0fe4 RW |
1480 | } |
1481 | ||
df17e62e MG |
1482 | static void pci_pme_list_scan(struct work_struct *work) |
1483 | { | |
379021d5 | 1484 | struct pci_pme_device *pme_dev, *n; |
df17e62e MG |
1485 | |
1486 | mutex_lock(&pci_pme_list_mutex); | |
1487 | if (!list_empty(&pci_pme_list)) { | |
379021d5 RW |
1488 | list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) { |
1489 | if (pme_dev->dev->pme_poll) { | |
1490 | pci_pme_wakeup(pme_dev->dev, NULL); | |
1491 | } else { | |
1492 | list_del(&pme_dev->list); | |
1493 | kfree(pme_dev); | |
1494 | } | |
1495 | } | |
1496 | if (!list_empty(&pci_pme_list)) | |
1497 | schedule_delayed_work(&pci_pme_work, | |
1498 | msecs_to_jiffies(PME_TIMEOUT)); | |
df17e62e MG |
1499 | } |
1500 | mutex_unlock(&pci_pme_list_mutex); | |
1501 | } | |
1502 | ||
eb9d0fe4 RW |
1503 | /** |
1504 | * pci_pme_active - enable or disable PCI device's PME# function | |
1505 | * @dev: PCI device to handle. | |
eb9d0fe4 RW |
1506 | * @enable: 'true' to enable PME# generation; 'false' to disable it. |
1507 | * | |
1508 | * The caller must verify that the device is capable of generating PME# before | |
1509 | * calling this function with @enable equal to 'true'. | |
1510 | */ | |
5a6c9b60 | 1511 | void pci_pme_active(struct pci_dev *dev, bool enable) |
eb9d0fe4 RW |
1512 | { |
1513 | u16 pmcsr; | |
1514 | ||
337001b6 | 1515 | if (!dev->pm_cap) |
eb9d0fe4 RW |
1516 | return; |
1517 | ||
337001b6 | 1518 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); |
eb9d0fe4 RW |
1519 | /* Clear PME_Status by writing 1 to it and enable PME# */ |
1520 | pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE; | |
1521 | if (!enable) | |
1522 | pmcsr &= ~PCI_PM_CTRL_PME_ENABLE; | |
1523 | ||
337001b6 | 1524 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); |
eb9d0fe4 | 1525 | |
df17e62e MG |
1526 | /* PCI (as opposed to PCIe) PME requires that the device have |
1527 | its PME# line hooked up correctly. Not all hardware vendors | |
1528 | do this, so the PME never gets delivered and the device | |
1529 | remains asleep. The easiest way around this is to | |
1530 | periodically walk the list of suspended devices and check | |
1531 | whether any have their PME flag set. The assumption is that | |
1532 | we'll wake up often enough anyway that this won't be a huge | |
1533 | hit, and the power savings from the devices will still be a | |
1534 | win. */ | |
1535 | ||
379021d5 | 1536 | if (dev->pme_poll) { |
df17e62e MG |
1537 | struct pci_pme_device *pme_dev; |
1538 | if (enable) { | |
1539 | pme_dev = kmalloc(sizeof(struct pci_pme_device), | |
1540 | GFP_KERNEL); | |
1541 | if (!pme_dev) | |
1542 | goto out; | |
1543 | pme_dev->dev = dev; | |
1544 | mutex_lock(&pci_pme_list_mutex); | |
1545 | list_add(&pme_dev->list, &pci_pme_list); | |
1546 | if (list_is_singular(&pci_pme_list)) | |
1547 | schedule_delayed_work(&pci_pme_work, | |
1548 | msecs_to_jiffies(PME_TIMEOUT)); | |
1549 | mutex_unlock(&pci_pme_list_mutex); | |
1550 | } else { | |
1551 | mutex_lock(&pci_pme_list_mutex); | |
1552 | list_for_each_entry(pme_dev, &pci_pme_list, list) { | |
1553 | if (pme_dev->dev == dev) { | |
1554 | list_del(&pme_dev->list); | |
1555 | kfree(pme_dev); | |
1556 | break; | |
1557 | } | |
1558 | } | |
1559 | mutex_unlock(&pci_pme_list_mutex); | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | out: | |
85b8582d | 1564 | dev_dbg(&dev->dev, "PME# %s\n", enable ? "enabled" : "disabled"); |
eb9d0fe4 RW |
1565 | } |
1566 | ||
1da177e4 | 1567 | /** |
6cbf8214 | 1568 | * __pci_enable_wake - enable PCI device as wakeup event source |
075c1771 DB |
1569 | * @dev: PCI device affected |
1570 | * @state: PCI state from which device will issue wakeup events | |
6cbf8214 | 1571 | * @runtime: True if the events are to be generated at run time |
075c1771 DB |
1572 | * @enable: True to enable event generation; false to disable |
1573 | * | |
1574 | * This enables the device as a wakeup event source, or disables it. | |
1575 | * When such events involves platform-specific hooks, those hooks are | |
1576 | * called automatically by this routine. | |
1577 | * | |
1578 | * Devices with legacy power management (no standard PCI PM capabilities) | |
eb9d0fe4 | 1579 | * always require such platform hooks. |
075c1771 | 1580 | * |
eb9d0fe4 RW |
1581 | * RETURN VALUE: |
1582 | * 0 is returned on success | |
1583 | * -EINVAL is returned if device is not supposed to wake up the system | |
1584 | * Error code depending on the platform is returned if both the platform and | |
1585 | * the native mechanism fail to enable the generation of wake-up events | |
1da177e4 | 1586 | */ |
6cbf8214 RW |
1587 | int __pci_enable_wake(struct pci_dev *dev, pci_power_t state, |
1588 | bool runtime, bool enable) | |
1da177e4 | 1589 | { |
5bcc2fb4 | 1590 | int ret = 0; |
075c1771 | 1591 | |
6cbf8214 | 1592 | if (enable && !runtime && !device_may_wakeup(&dev->dev)) |
eb9d0fe4 | 1593 | return -EINVAL; |
1da177e4 | 1594 | |
e80bb09d RW |
1595 | /* Don't do the same thing twice in a row for one device. */ |
1596 | if (!!enable == !!dev->wakeup_prepared) | |
1597 | return 0; | |
1598 | ||
eb9d0fe4 RW |
1599 | /* |
1600 | * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don | |
1601 | * Anderson we should be doing PME# wake enable followed by ACPI wake | |
1602 | * enable. To disable wake-up we call the platform first, for symmetry. | |
075c1771 | 1603 | */ |
1da177e4 | 1604 | |
5bcc2fb4 RW |
1605 | if (enable) { |
1606 | int error; | |
1da177e4 | 1607 | |
5bcc2fb4 RW |
1608 | if (pci_pme_capable(dev, state)) |
1609 | pci_pme_active(dev, true); | |
1610 | else | |
1611 | ret = 1; | |
6cbf8214 RW |
1612 | error = runtime ? platform_pci_run_wake(dev, true) : |
1613 | platform_pci_sleep_wake(dev, true); | |
5bcc2fb4 RW |
1614 | if (ret) |
1615 | ret = error; | |
e80bb09d RW |
1616 | if (!ret) |
1617 | dev->wakeup_prepared = true; | |
5bcc2fb4 | 1618 | } else { |
6cbf8214 RW |
1619 | if (runtime) |
1620 | platform_pci_run_wake(dev, false); | |
1621 | else | |
1622 | platform_pci_sleep_wake(dev, false); | |
5bcc2fb4 | 1623 | pci_pme_active(dev, false); |
e80bb09d | 1624 | dev->wakeup_prepared = false; |
5bcc2fb4 | 1625 | } |
1da177e4 | 1626 | |
5bcc2fb4 | 1627 | return ret; |
eb9d0fe4 | 1628 | } |
6cbf8214 | 1629 | EXPORT_SYMBOL(__pci_enable_wake); |
1da177e4 | 1630 | |
0235c4fc RW |
1631 | /** |
1632 | * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold | |
1633 | * @dev: PCI device to prepare | |
1634 | * @enable: True to enable wake-up event generation; false to disable | |
1635 | * | |
1636 | * Many drivers want the device to wake up the system from D3_hot or D3_cold | |
1637 | * and this function allows them to set that up cleanly - pci_enable_wake() | |
1638 | * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI | |
1639 | * ordering constraints. | |
1640 | * | |
1641 | * This function only returns error code if the device is not capable of | |
1642 | * generating PME# from both D3_hot and D3_cold, and the platform is unable to | |
1643 | * enable wake-up power for it. | |
1644 | */ | |
1645 | int pci_wake_from_d3(struct pci_dev *dev, bool enable) | |
1646 | { | |
1647 | return pci_pme_capable(dev, PCI_D3cold) ? | |
1648 | pci_enable_wake(dev, PCI_D3cold, enable) : | |
1649 | pci_enable_wake(dev, PCI_D3hot, enable); | |
1650 | } | |
1651 | ||
404cc2d8 | 1652 | /** |
37139074 JB |
1653 | * pci_target_state - find an appropriate low power state for a given PCI dev |
1654 | * @dev: PCI device | |
1655 | * | |
1656 | * Use underlying platform code to find a supported low power state for @dev. | |
1657 | * If the platform can't manage @dev, return the deepest state from which it | |
1658 | * can generate wake events, based on any available PME info. | |
404cc2d8 | 1659 | */ |
e5899e1b | 1660 | pci_power_t pci_target_state(struct pci_dev *dev) |
404cc2d8 RW |
1661 | { |
1662 | pci_power_t target_state = PCI_D3hot; | |
404cc2d8 RW |
1663 | |
1664 | if (platform_pci_power_manageable(dev)) { | |
1665 | /* | |
1666 | * Call the platform to choose the target state of the device | |
1667 | * and enable wake-up from this state if supported. | |
1668 | */ | |
1669 | pci_power_t state = platform_pci_choose_state(dev); | |
1670 | ||
1671 | switch (state) { | |
1672 | case PCI_POWER_ERROR: | |
1673 | case PCI_UNKNOWN: | |
1674 | break; | |
1675 | case PCI_D1: | |
1676 | case PCI_D2: | |
1677 | if (pci_no_d1d2(dev)) | |
1678 | break; | |
1679 | default: | |
1680 | target_state = state; | |
404cc2d8 | 1681 | } |
d2abdf62 RW |
1682 | } else if (!dev->pm_cap) { |
1683 | target_state = PCI_D0; | |
404cc2d8 RW |
1684 | } else if (device_may_wakeup(&dev->dev)) { |
1685 | /* | |
1686 | * Find the deepest state from which the device can generate | |
1687 | * wake-up events, make it the target state and enable device | |
1688 | * to generate PME#. | |
1689 | */ | |
337001b6 RW |
1690 | if (dev->pme_support) { |
1691 | while (target_state | |
1692 | && !(dev->pme_support & (1 << target_state))) | |
1693 | target_state--; | |
404cc2d8 RW |
1694 | } |
1695 | } | |
1696 | ||
e5899e1b RW |
1697 | return target_state; |
1698 | } | |
1699 | ||
1700 | /** | |
1701 | * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state | |
1702 | * @dev: Device to handle. | |
1703 | * | |
1704 | * Choose the power state appropriate for the device depending on whether | |
1705 | * it can wake up the system and/or is power manageable by the platform | |
1706 | * (PCI_D3hot is the default) and put the device into that state. | |
1707 | */ | |
1708 | int pci_prepare_to_sleep(struct pci_dev *dev) | |
1709 | { | |
1710 | pci_power_t target_state = pci_target_state(dev); | |
1711 | int error; | |
1712 | ||
1713 | if (target_state == PCI_POWER_ERROR) | |
1714 | return -EIO; | |
1715 | ||
8efb8c76 | 1716 | pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev)); |
c157dfa3 | 1717 | |
404cc2d8 RW |
1718 | error = pci_set_power_state(dev, target_state); |
1719 | ||
1720 | if (error) | |
1721 | pci_enable_wake(dev, target_state, false); | |
1722 | ||
1723 | return error; | |
1724 | } | |
1725 | ||
1726 | /** | |
443bd1c4 | 1727 | * pci_back_from_sleep - turn PCI device on during system-wide transition into working state |
404cc2d8 RW |
1728 | * @dev: Device to handle. |
1729 | * | |
88393161 | 1730 | * Disable device's system wake-up capability and put it into D0. |
404cc2d8 RW |
1731 | */ |
1732 | int pci_back_from_sleep(struct pci_dev *dev) | |
1733 | { | |
1734 | pci_enable_wake(dev, PCI_D0, false); | |
1735 | return pci_set_power_state(dev, PCI_D0); | |
1736 | } | |
1737 | ||
6cbf8214 RW |
1738 | /** |
1739 | * pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend. | |
1740 | * @dev: PCI device being suspended. | |
1741 | * | |
1742 | * Prepare @dev to generate wake-up events at run time and put it into a low | |
1743 | * power state. | |
1744 | */ | |
1745 | int pci_finish_runtime_suspend(struct pci_dev *dev) | |
1746 | { | |
1747 | pci_power_t target_state = pci_target_state(dev); | |
1748 | int error; | |
1749 | ||
1750 | if (target_state == PCI_POWER_ERROR) | |
1751 | return -EIO; | |
1752 | ||
1753 | __pci_enable_wake(dev, target_state, true, pci_dev_run_wake(dev)); | |
1754 | ||
1755 | error = pci_set_power_state(dev, target_state); | |
1756 | ||
1757 | if (error) | |
1758 | __pci_enable_wake(dev, target_state, true, false); | |
1759 | ||
1760 | return error; | |
1761 | } | |
1762 | ||
b67ea761 RW |
1763 | /** |
1764 | * pci_dev_run_wake - Check if device can generate run-time wake-up events. | |
1765 | * @dev: Device to check. | |
1766 | * | |
1767 | * Return true if the device itself is cabable of generating wake-up events | |
1768 | * (through the platform or using the native PCIe PME) or if the device supports | |
1769 | * PME and one of its upstream bridges can generate wake-up events. | |
1770 | */ | |
1771 | bool pci_dev_run_wake(struct pci_dev *dev) | |
1772 | { | |
1773 | struct pci_bus *bus = dev->bus; | |
1774 | ||
1775 | if (device_run_wake(&dev->dev)) | |
1776 | return true; | |
1777 | ||
1778 | if (!dev->pme_support) | |
1779 | return false; | |
1780 | ||
1781 | while (bus->parent) { | |
1782 | struct pci_dev *bridge = bus->self; | |
1783 | ||
1784 | if (device_run_wake(&bridge->dev)) | |
1785 | return true; | |
1786 | ||
1787 | bus = bus->parent; | |
1788 | } | |
1789 | ||
1790 | /* We have reached the root bus. */ | |
1791 | if (bus->bridge) | |
1792 | return device_run_wake(bus->bridge); | |
1793 | ||
1794 | return false; | |
1795 | } | |
1796 | EXPORT_SYMBOL_GPL(pci_dev_run_wake); | |
1797 | ||
eb9d0fe4 RW |
1798 | /** |
1799 | * pci_pm_init - Initialize PM functions of given PCI device | |
1800 | * @dev: PCI device to handle. | |
1801 | */ | |
1802 | void pci_pm_init(struct pci_dev *dev) | |
1803 | { | |
1804 | int pm; | |
1805 | u16 pmc; | |
1da177e4 | 1806 | |
bb910a70 | 1807 | pm_runtime_forbid(&dev->dev); |
a1e4d72c | 1808 | device_enable_async_suspend(&dev->dev); |
e80bb09d | 1809 | dev->wakeup_prepared = false; |
bb910a70 | 1810 | |
337001b6 RW |
1811 | dev->pm_cap = 0; |
1812 | ||
eb9d0fe4 RW |
1813 | /* find PCI PM capability in list */ |
1814 | pm = pci_find_capability(dev, PCI_CAP_ID_PM); | |
1815 | if (!pm) | |
50246dd4 | 1816 | return; |
eb9d0fe4 RW |
1817 | /* Check device's ability to generate PME# */ |
1818 | pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc); | |
075c1771 | 1819 | |
eb9d0fe4 RW |
1820 | if ((pmc & PCI_PM_CAP_VER_MASK) > 3) { |
1821 | dev_err(&dev->dev, "unsupported PM cap regs version (%u)\n", | |
1822 | pmc & PCI_PM_CAP_VER_MASK); | |
50246dd4 | 1823 | return; |
eb9d0fe4 RW |
1824 | } |
1825 | ||
337001b6 | 1826 | dev->pm_cap = pm; |
1ae861e6 | 1827 | dev->d3_delay = PCI_PM_D3_WAIT; |
337001b6 RW |
1828 | |
1829 | dev->d1_support = false; | |
1830 | dev->d2_support = false; | |
1831 | if (!pci_no_d1d2(dev)) { | |
c9ed77ee | 1832 | if (pmc & PCI_PM_CAP_D1) |
337001b6 | 1833 | dev->d1_support = true; |
c9ed77ee | 1834 | if (pmc & PCI_PM_CAP_D2) |
337001b6 | 1835 | dev->d2_support = true; |
c9ed77ee BH |
1836 | |
1837 | if (dev->d1_support || dev->d2_support) | |
1838 | dev_printk(KERN_DEBUG, &dev->dev, "supports%s%s\n", | |
ec84f126 JB |
1839 | dev->d1_support ? " D1" : "", |
1840 | dev->d2_support ? " D2" : ""); | |
337001b6 RW |
1841 | } |
1842 | ||
1843 | pmc &= PCI_PM_CAP_PME_MASK; | |
1844 | if (pmc) { | |
10c3d71d BH |
1845 | dev_printk(KERN_DEBUG, &dev->dev, |
1846 | "PME# supported from%s%s%s%s%s\n", | |
c9ed77ee BH |
1847 | (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "", |
1848 | (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "", | |
1849 | (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "", | |
1850 | (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "", | |
1851 | (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : ""); | |
337001b6 | 1852 | dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT; |
379021d5 | 1853 | dev->pme_poll = true; |
eb9d0fe4 RW |
1854 | /* |
1855 | * Make device's PM flags reflect the wake-up capability, but | |
1856 | * let the user space enable it to wake up the system as needed. | |
1857 | */ | |
1858 | device_set_wakeup_capable(&dev->dev, true); | |
eb9d0fe4 | 1859 | /* Disable the PME# generation functionality */ |
337001b6 RW |
1860 | pci_pme_active(dev, false); |
1861 | } else { | |
1862 | dev->pme_support = 0; | |
eb9d0fe4 | 1863 | } |
1da177e4 LT |
1864 | } |
1865 | ||
eb9c39d0 JB |
1866 | /** |
1867 | * platform_pci_wakeup_init - init platform wakeup if present | |
1868 | * @dev: PCI device | |
1869 | * | |
1870 | * Some devices don't have PCI PM caps but can still generate wakeup | |
1871 | * events through platform methods (like ACPI events). If @dev supports | |
1872 | * platform wakeup events, set the device flag to indicate as much. This | |
1873 | * may be redundant if the device also supports PCI PM caps, but double | |
1874 | * initialization should be safe in that case. | |
1875 | */ | |
1876 | void platform_pci_wakeup_init(struct pci_dev *dev) | |
1877 | { | |
1878 | if (!platform_pci_can_wakeup(dev)) | |
1879 | return; | |
1880 | ||
1881 | device_set_wakeup_capable(&dev->dev, true); | |
eb9c39d0 JB |
1882 | platform_pci_sleep_wake(dev, false); |
1883 | } | |
1884 | ||
34a4876e YL |
1885 | static void pci_add_saved_cap(struct pci_dev *pci_dev, |
1886 | struct pci_cap_saved_state *new_cap) | |
1887 | { | |
1888 | hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space); | |
1889 | } | |
1890 | ||
63f4898a RW |
1891 | /** |
1892 | * pci_add_save_buffer - allocate buffer for saving given capability registers | |
1893 | * @dev: the PCI device | |
1894 | * @cap: the capability to allocate the buffer for | |
1895 | * @size: requested size of the buffer | |
1896 | */ | |
1897 | static int pci_add_cap_save_buffer( | |
1898 | struct pci_dev *dev, char cap, unsigned int size) | |
1899 | { | |
1900 | int pos; | |
1901 | struct pci_cap_saved_state *save_state; | |
1902 | ||
1903 | pos = pci_find_capability(dev, cap); | |
1904 | if (pos <= 0) | |
1905 | return 0; | |
1906 | ||
1907 | save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL); | |
1908 | if (!save_state) | |
1909 | return -ENOMEM; | |
1910 | ||
24a4742f AW |
1911 | save_state->cap.cap_nr = cap; |
1912 | save_state->cap.size = size; | |
63f4898a RW |
1913 | pci_add_saved_cap(dev, save_state); |
1914 | ||
1915 | return 0; | |
1916 | } | |
1917 | ||
1918 | /** | |
1919 | * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities | |
1920 | * @dev: the PCI device | |
1921 | */ | |
1922 | void pci_allocate_cap_save_buffers(struct pci_dev *dev) | |
1923 | { | |
1924 | int error; | |
1925 | ||
89858517 YZ |
1926 | error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, |
1927 | PCI_EXP_SAVE_REGS * sizeof(u16)); | |
63f4898a RW |
1928 | if (error) |
1929 | dev_err(&dev->dev, | |
1930 | "unable to preallocate PCI Express save buffer\n"); | |
1931 | ||
1932 | error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16)); | |
1933 | if (error) | |
1934 | dev_err(&dev->dev, | |
1935 | "unable to preallocate PCI-X save buffer\n"); | |
1936 | } | |
1937 | ||
f796841e YL |
1938 | void pci_free_cap_save_buffers(struct pci_dev *dev) |
1939 | { | |
1940 | struct pci_cap_saved_state *tmp; | |
1941 | struct hlist_node *pos, *n; | |
1942 | ||
1943 | hlist_for_each_entry_safe(tmp, pos, n, &dev->saved_cap_space, next) | |
1944 | kfree(tmp); | |
1945 | } | |
1946 | ||
58c3a727 YZ |
1947 | /** |
1948 | * pci_enable_ari - enable ARI forwarding if hardware support it | |
1949 | * @dev: the PCI device | |
1950 | */ | |
1951 | void pci_enable_ari(struct pci_dev *dev) | |
1952 | { | |
1953 | int pos; | |
1954 | u32 cap; | |
864d296c | 1955 | u16 flags, ctrl; |
8113587c | 1956 | struct pci_dev *bridge; |
58c3a727 | 1957 | |
5f4d91a1 | 1958 | if (!pci_is_pcie(dev) || dev->devfn) |
58c3a727 YZ |
1959 | return; |
1960 | ||
8113587c ZY |
1961 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); |
1962 | if (!pos) | |
58c3a727 YZ |
1963 | return; |
1964 | ||
8113587c | 1965 | bridge = dev->bus->self; |
5f4d91a1 | 1966 | if (!bridge || !pci_is_pcie(bridge)) |
8113587c ZY |
1967 | return; |
1968 | ||
06a1cbaf | 1969 | pos = pci_pcie_cap(bridge); |
58c3a727 YZ |
1970 | if (!pos) |
1971 | return; | |
1972 | ||
864d296c CW |
1973 | /* ARI is a PCIe v2 feature */ |
1974 | pci_read_config_word(bridge, pos + PCI_EXP_FLAGS, &flags); | |
1975 | if ((flags & PCI_EXP_FLAGS_VERS) < 2) | |
1976 | return; | |
1977 | ||
8113587c | 1978 | pci_read_config_dword(bridge, pos + PCI_EXP_DEVCAP2, &cap); |
58c3a727 YZ |
1979 | if (!(cap & PCI_EXP_DEVCAP2_ARI)) |
1980 | return; | |
1981 | ||
8113587c | 1982 | pci_read_config_word(bridge, pos + PCI_EXP_DEVCTL2, &ctrl); |
58c3a727 | 1983 | ctrl |= PCI_EXP_DEVCTL2_ARI; |
8113587c | 1984 | pci_write_config_word(bridge, pos + PCI_EXP_DEVCTL2, ctrl); |
58c3a727 | 1985 | |
8113587c | 1986 | bridge->ari_enabled = 1; |
58c3a727 YZ |
1987 | } |
1988 | ||
b48d4425 JB |
1989 | /** |
1990 | * pci_enable_ido - enable ID-based ordering on a device | |
1991 | * @dev: the PCI device | |
1992 | * @type: which types of IDO to enable | |
1993 | * | |
1994 | * Enable ID-based ordering on @dev. @type can contain the bits | |
1995 | * %PCI_EXP_IDO_REQUEST and/or %PCI_EXP_IDO_COMPLETION to indicate | |
1996 | * which types of transactions are allowed to be re-ordered. | |
1997 | */ | |
1998 | void pci_enable_ido(struct pci_dev *dev, unsigned long type) | |
1999 | { | |
2000 | int pos; | |
2001 | u16 ctrl; | |
2002 | ||
2003 | pos = pci_pcie_cap(dev); | |
2004 | if (!pos) | |
2005 | return; | |
2006 | ||
2007 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl); | |
2008 | if (type & PCI_EXP_IDO_REQUEST) | |
2009 | ctrl |= PCI_EXP_IDO_REQ_EN; | |
2010 | if (type & PCI_EXP_IDO_COMPLETION) | |
2011 | ctrl |= PCI_EXP_IDO_CMP_EN; | |
2012 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl); | |
2013 | } | |
2014 | EXPORT_SYMBOL(pci_enable_ido); | |
2015 | ||
2016 | /** | |
2017 | * pci_disable_ido - disable ID-based ordering on a device | |
2018 | * @dev: the PCI device | |
2019 | * @type: which types of IDO to disable | |
2020 | */ | |
2021 | void pci_disable_ido(struct pci_dev *dev, unsigned long type) | |
2022 | { | |
2023 | int pos; | |
2024 | u16 ctrl; | |
2025 | ||
2026 | if (!pci_is_pcie(dev)) | |
2027 | return; | |
2028 | ||
2029 | pos = pci_pcie_cap(dev); | |
2030 | if (!pos) | |
2031 | return; | |
2032 | ||
2033 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl); | |
2034 | if (type & PCI_EXP_IDO_REQUEST) | |
2035 | ctrl &= ~PCI_EXP_IDO_REQ_EN; | |
2036 | if (type & PCI_EXP_IDO_COMPLETION) | |
2037 | ctrl &= ~PCI_EXP_IDO_CMP_EN; | |
2038 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl); | |
2039 | } | |
2040 | EXPORT_SYMBOL(pci_disable_ido); | |
2041 | ||
48a92a81 JB |
2042 | /** |
2043 | * pci_enable_obff - enable optimized buffer flush/fill | |
2044 | * @dev: PCI device | |
2045 | * @type: type of signaling to use | |
2046 | * | |
2047 | * Try to enable @type OBFF signaling on @dev. It will try using WAKE# | |
2048 | * signaling if possible, falling back to message signaling only if | |
2049 | * WAKE# isn't supported. @type should indicate whether the PCIe link | |
2050 | * be brought out of L0s or L1 to send the message. It should be either | |
2051 | * %PCI_EXP_OBFF_SIGNAL_ALWAYS or %PCI_OBFF_SIGNAL_L0. | |
2052 | * | |
2053 | * If your device can benefit from receiving all messages, even at the | |
2054 | * power cost of bringing the link back up from a low power state, use | |
2055 | * %PCI_EXP_OBFF_SIGNAL_ALWAYS. Otherwise, use %PCI_OBFF_SIGNAL_L0 (the | |
2056 | * preferred type). | |
2057 | * | |
2058 | * RETURNS: | |
2059 | * Zero on success, appropriate error number on failure. | |
2060 | */ | |
2061 | int pci_enable_obff(struct pci_dev *dev, enum pci_obff_signal_type type) | |
2062 | { | |
2063 | int pos; | |
2064 | u32 cap; | |
2065 | u16 ctrl; | |
2066 | int ret; | |
2067 | ||
2068 | if (!pci_is_pcie(dev)) | |
2069 | return -ENOTSUPP; | |
2070 | ||
2071 | pos = pci_pcie_cap(dev); | |
2072 | if (!pos) | |
2073 | return -ENOTSUPP; | |
2074 | ||
2075 | pci_read_config_dword(dev, pos + PCI_EXP_DEVCAP2, &cap); | |
2076 | if (!(cap & PCI_EXP_OBFF_MASK)) | |
2077 | return -ENOTSUPP; /* no OBFF support at all */ | |
2078 | ||
2079 | /* Make sure the topology supports OBFF as well */ | |
2080 | if (dev->bus) { | |
2081 | ret = pci_enable_obff(dev->bus->self, type); | |
2082 | if (ret) | |
2083 | return ret; | |
2084 | } | |
2085 | ||
2086 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl); | |
2087 | if (cap & PCI_EXP_OBFF_WAKE) | |
2088 | ctrl |= PCI_EXP_OBFF_WAKE_EN; | |
2089 | else { | |
2090 | switch (type) { | |
2091 | case PCI_EXP_OBFF_SIGNAL_L0: | |
2092 | if (!(ctrl & PCI_EXP_OBFF_WAKE_EN)) | |
2093 | ctrl |= PCI_EXP_OBFF_MSGA_EN; | |
2094 | break; | |
2095 | case PCI_EXP_OBFF_SIGNAL_ALWAYS: | |
2096 | ctrl &= ~PCI_EXP_OBFF_WAKE_EN; | |
2097 | ctrl |= PCI_EXP_OBFF_MSGB_EN; | |
2098 | break; | |
2099 | default: | |
2100 | WARN(1, "bad OBFF signal type\n"); | |
2101 | return -ENOTSUPP; | |
2102 | } | |
2103 | } | |
2104 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl); | |
2105 | ||
2106 | return 0; | |
2107 | } | |
2108 | EXPORT_SYMBOL(pci_enable_obff); | |
2109 | ||
2110 | /** | |
2111 | * pci_disable_obff - disable optimized buffer flush/fill | |
2112 | * @dev: PCI device | |
2113 | * | |
2114 | * Disable OBFF on @dev. | |
2115 | */ | |
2116 | void pci_disable_obff(struct pci_dev *dev) | |
2117 | { | |
2118 | int pos; | |
2119 | u16 ctrl; | |
2120 | ||
2121 | if (!pci_is_pcie(dev)) | |
2122 | return; | |
2123 | ||
2124 | pos = pci_pcie_cap(dev); | |
2125 | if (!pos) | |
2126 | return; | |
2127 | ||
2128 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl); | |
2129 | ctrl &= ~PCI_EXP_OBFF_WAKE_EN; | |
2130 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl); | |
2131 | } | |
2132 | EXPORT_SYMBOL(pci_disable_obff); | |
2133 | ||
51c2e0a7 JB |
2134 | /** |
2135 | * pci_ltr_supported - check whether a device supports LTR | |
2136 | * @dev: PCI device | |
2137 | * | |
2138 | * RETURNS: | |
2139 | * True if @dev supports latency tolerance reporting, false otherwise. | |
2140 | */ | |
2141 | bool pci_ltr_supported(struct pci_dev *dev) | |
2142 | { | |
2143 | int pos; | |
2144 | u32 cap; | |
2145 | ||
2146 | if (!pci_is_pcie(dev)) | |
2147 | return false; | |
2148 | ||
2149 | pos = pci_pcie_cap(dev); | |
2150 | if (!pos) | |
2151 | return false; | |
2152 | ||
2153 | pci_read_config_dword(dev, pos + PCI_EXP_DEVCAP2, &cap); | |
2154 | ||
2155 | return cap & PCI_EXP_DEVCAP2_LTR; | |
2156 | } | |
2157 | EXPORT_SYMBOL(pci_ltr_supported); | |
2158 | ||
2159 | /** | |
2160 | * pci_enable_ltr - enable latency tolerance reporting | |
2161 | * @dev: PCI device | |
2162 | * | |
2163 | * Enable LTR on @dev if possible, which means enabling it first on | |
2164 | * upstream ports. | |
2165 | * | |
2166 | * RETURNS: | |
2167 | * Zero on success, errno on failure. | |
2168 | */ | |
2169 | int pci_enable_ltr(struct pci_dev *dev) | |
2170 | { | |
2171 | int pos; | |
2172 | u16 ctrl; | |
2173 | int ret; | |
2174 | ||
2175 | if (!pci_ltr_supported(dev)) | |
2176 | return -ENOTSUPP; | |
2177 | ||
2178 | pos = pci_pcie_cap(dev); | |
2179 | if (!pos) | |
2180 | return -ENOTSUPP; | |
2181 | ||
2182 | /* Only primary function can enable/disable LTR */ | |
2183 | if (PCI_FUNC(dev->devfn) != 0) | |
2184 | return -EINVAL; | |
2185 | ||
2186 | /* Enable upstream ports first */ | |
2187 | if (dev->bus) { | |
2188 | ret = pci_enable_ltr(dev->bus->self); | |
2189 | if (ret) | |
2190 | return ret; | |
2191 | } | |
2192 | ||
2193 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl); | |
2194 | ctrl |= PCI_EXP_LTR_EN; | |
2195 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl); | |
2196 | ||
2197 | return 0; | |
2198 | } | |
2199 | EXPORT_SYMBOL(pci_enable_ltr); | |
2200 | ||
2201 | /** | |
2202 | * pci_disable_ltr - disable latency tolerance reporting | |
2203 | * @dev: PCI device | |
2204 | */ | |
2205 | void pci_disable_ltr(struct pci_dev *dev) | |
2206 | { | |
2207 | int pos; | |
2208 | u16 ctrl; | |
2209 | ||
2210 | if (!pci_ltr_supported(dev)) | |
2211 | return; | |
2212 | ||
2213 | pos = pci_pcie_cap(dev); | |
2214 | if (!pos) | |
2215 | return; | |
2216 | ||
2217 | /* Only primary function can enable/disable LTR */ | |
2218 | if (PCI_FUNC(dev->devfn) != 0) | |
2219 | return; | |
2220 | ||
2221 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl); | |
2222 | ctrl &= ~PCI_EXP_LTR_EN; | |
2223 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl); | |
2224 | } | |
2225 | EXPORT_SYMBOL(pci_disable_ltr); | |
2226 | ||
2227 | static int __pci_ltr_scale(int *val) | |
2228 | { | |
2229 | int scale = 0; | |
2230 | ||
2231 | while (*val > 1023) { | |
2232 | *val = (*val + 31) / 32; | |
2233 | scale++; | |
2234 | } | |
2235 | return scale; | |
2236 | } | |
2237 | ||
2238 | /** | |
2239 | * pci_set_ltr - set LTR latency values | |
2240 | * @dev: PCI device | |
2241 | * @snoop_lat_ns: snoop latency in nanoseconds | |
2242 | * @nosnoop_lat_ns: nosnoop latency in nanoseconds | |
2243 | * | |
2244 | * Figure out the scale and set the LTR values accordingly. | |
2245 | */ | |
2246 | int pci_set_ltr(struct pci_dev *dev, int snoop_lat_ns, int nosnoop_lat_ns) | |
2247 | { | |
2248 | int pos, ret, snoop_scale, nosnoop_scale; | |
2249 | u16 val; | |
2250 | ||
2251 | if (!pci_ltr_supported(dev)) | |
2252 | return -ENOTSUPP; | |
2253 | ||
2254 | snoop_scale = __pci_ltr_scale(&snoop_lat_ns); | |
2255 | nosnoop_scale = __pci_ltr_scale(&nosnoop_lat_ns); | |
2256 | ||
2257 | if (snoop_lat_ns > PCI_LTR_VALUE_MASK || | |
2258 | nosnoop_lat_ns > PCI_LTR_VALUE_MASK) | |
2259 | return -EINVAL; | |
2260 | ||
2261 | if ((snoop_scale > (PCI_LTR_SCALE_MASK >> PCI_LTR_SCALE_SHIFT)) || | |
2262 | (nosnoop_scale > (PCI_LTR_SCALE_MASK >> PCI_LTR_SCALE_SHIFT))) | |
2263 | return -EINVAL; | |
2264 | ||
2265 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR); | |
2266 | if (!pos) | |
2267 | return -ENOTSUPP; | |
2268 | ||
2269 | val = (snoop_scale << PCI_LTR_SCALE_SHIFT) | snoop_lat_ns; | |
2270 | ret = pci_write_config_word(dev, pos + PCI_LTR_MAX_SNOOP_LAT, val); | |
2271 | if (ret != 4) | |
2272 | return -EIO; | |
2273 | ||
2274 | val = (nosnoop_scale << PCI_LTR_SCALE_SHIFT) | nosnoop_lat_ns; | |
2275 | ret = pci_write_config_word(dev, pos + PCI_LTR_MAX_NOSNOOP_LAT, val); | |
2276 | if (ret != 4) | |
2277 | return -EIO; | |
2278 | ||
2279 | return 0; | |
2280 | } | |
2281 | EXPORT_SYMBOL(pci_set_ltr); | |
2282 | ||
5d990b62 CW |
2283 | static int pci_acs_enable; |
2284 | ||
2285 | /** | |
2286 | * pci_request_acs - ask for ACS to be enabled if supported | |
2287 | */ | |
2288 | void pci_request_acs(void) | |
2289 | { | |
2290 | pci_acs_enable = 1; | |
2291 | } | |
2292 | ||
ae21ee65 AK |
2293 | /** |
2294 | * pci_enable_acs - enable ACS if hardware support it | |
2295 | * @dev: the PCI device | |
2296 | */ | |
2297 | void pci_enable_acs(struct pci_dev *dev) | |
2298 | { | |
2299 | int pos; | |
2300 | u16 cap; | |
2301 | u16 ctrl; | |
2302 | ||
5d990b62 CW |
2303 | if (!pci_acs_enable) |
2304 | return; | |
2305 | ||
5f4d91a1 | 2306 | if (!pci_is_pcie(dev)) |
ae21ee65 AK |
2307 | return; |
2308 | ||
2309 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); | |
2310 | if (!pos) | |
2311 | return; | |
2312 | ||
2313 | pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap); | |
2314 | pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl); | |
2315 | ||
2316 | /* Source Validation */ | |
2317 | ctrl |= (cap & PCI_ACS_SV); | |
2318 | ||
2319 | /* P2P Request Redirect */ | |
2320 | ctrl |= (cap & PCI_ACS_RR); | |
2321 | ||
2322 | /* P2P Completion Redirect */ | |
2323 | ctrl |= (cap & PCI_ACS_CR); | |
2324 | ||
2325 | /* Upstream Forwarding */ | |
2326 | ctrl |= (cap & PCI_ACS_UF); | |
2327 | ||
2328 | pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl); | |
2329 | } | |
2330 | ||
57c2cf71 BH |
2331 | /** |
2332 | * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge | |
2333 | * @dev: the PCI device | |
2334 | * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTD, 4=INTD) | |
2335 | * | |
2336 | * Perform INTx swizzling for a device behind one level of bridge. This is | |
2337 | * required by section 9.1 of the PCI-to-PCI bridge specification for devices | |
46b952a3 MW |
2338 | * behind bridges on add-in cards. For devices with ARI enabled, the slot |
2339 | * number is always 0 (see the Implementation Note in section 2.2.8.1 of | |
2340 | * the PCI Express Base Specification, Revision 2.1) | |
57c2cf71 BH |
2341 | */ |
2342 | u8 pci_swizzle_interrupt_pin(struct pci_dev *dev, u8 pin) | |
2343 | { | |
46b952a3 MW |
2344 | int slot; |
2345 | ||
2346 | if (pci_ari_enabled(dev->bus)) | |
2347 | slot = 0; | |
2348 | else | |
2349 | slot = PCI_SLOT(dev->devfn); | |
2350 | ||
2351 | return (((pin - 1) + slot) % 4) + 1; | |
57c2cf71 BH |
2352 | } |
2353 | ||
1da177e4 LT |
2354 | int |
2355 | pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge) | |
2356 | { | |
2357 | u8 pin; | |
2358 | ||
514d207d | 2359 | pin = dev->pin; |
1da177e4 LT |
2360 | if (!pin) |
2361 | return -1; | |
878f2e50 | 2362 | |
8784fd4d | 2363 | while (!pci_is_root_bus(dev->bus)) { |
57c2cf71 | 2364 | pin = pci_swizzle_interrupt_pin(dev, pin); |
1da177e4 LT |
2365 | dev = dev->bus->self; |
2366 | } | |
2367 | *bridge = dev; | |
2368 | return pin; | |
2369 | } | |
2370 | ||
68feac87 BH |
2371 | /** |
2372 | * pci_common_swizzle - swizzle INTx all the way to root bridge | |
2373 | * @dev: the PCI device | |
2374 | * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD) | |
2375 | * | |
2376 | * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI | |
2377 | * bridges all the way up to a PCI root bus. | |
2378 | */ | |
2379 | u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp) | |
2380 | { | |
2381 | u8 pin = *pinp; | |
2382 | ||
1eb39487 | 2383 | while (!pci_is_root_bus(dev->bus)) { |
68feac87 BH |
2384 | pin = pci_swizzle_interrupt_pin(dev, pin); |
2385 | dev = dev->bus->self; | |
2386 | } | |
2387 | *pinp = pin; | |
2388 | return PCI_SLOT(dev->devfn); | |
2389 | } | |
2390 | ||
1da177e4 LT |
2391 | /** |
2392 | * pci_release_region - Release a PCI bar | |
2393 | * @pdev: PCI device whose resources were previously reserved by pci_request_region | |
2394 | * @bar: BAR to release | |
2395 | * | |
2396 | * Releases the PCI I/O and memory resources previously reserved by a | |
2397 | * successful call to pci_request_region. Call this function only | |
2398 | * after all use of the PCI regions has ceased. | |
2399 | */ | |
2400 | void pci_release_region(struct pci_dev *pdev, int bar) | |
2401 | { | |
9ac7849e TH |
2402 | struct pci_devres *dr; |
2403 | ||
1da177e4 LT |
2404 | if (pci_resource_len(pdev, bar) == 0) |
2405 | return; | |
2406 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) | |
2407 | release_region(pci_resource_start(pdev, bar), | |
2408 | pci_resource_len(pdev, bar)); | |
2409 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) | |
2410 | release_mem_region(pci_resource_start(pdev, bar), | |
2411 | pci_resource_len(pdev, bar)); | |
9ac7849e TH |
2412 | |
2413 | dr = find_pci_dr(pdev); | |
2414 | if (dr) | |
2415 | dr->region_mask &= ~(1 << bar); | |
1da177e4 LT |
2416 | } |
2417 | ||
2418 | /** | |
f5ddcac4 | 2419 | * __pci_request_region - Reserved PCI I/O and memory resource |
1da177e4 LT |
2420 | * @pdev: PCI device whose resources are to be reserved |
2421 | * @bar: BAR to be reserved | |
2422 | * @res_name: Name to be associated with resource. | |
f5ddcac4 | 2423 | * @exclusive: whether the region access is exclusive or not |
1da177e4 LT |
2424 | * |
2425 | * Mark the PCI region associated with PCI device @pdev BR @bar as | |
2426 | * being reserved by owner @res_name. Do not access any | |
2427 | * address inside the PCI regions unless this call returns | |
2428 | * successfully. | |
2429 | * | |
f5ddcac4 RD |
2430 | * If @exclusive is set, then the region is marked so that userspace |
2431 | * is explicitly not allowed to map the resource via /dev/mem or | |
2432 | * sysfs MMIO access. | |
2433 | * | |
1da177e4 LT |
2434 | * Returns 0 on success, or %EBUSY on error. A warning |
2435 | * message is also printed on failure. | |
2436 | */ | |
e8de1481 AV |
2437 | static int __pci_request_region(struct pci_dev *pdev, int bar, const char *res_name, |
2438 | int exclusive) | |
1da177e4 | 2439 | { |
9ac7849e TH |
2440 | struct pci_devres *dr; |
2441 | ||
1da177e4 LT |
2442 | if (pci_resource_len(pdev, bar) == 0) |
2443 | return 0; | |
2444 | ||
2445 | if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) { | |
2446 | if (!request_region(pci_resource_start(pdev, bar), | |
2447 | pci_resource_len(pdev, bar), res_name)) | |
2448 | goto err_out; | |
2449 | } | |
2450 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) { | |
e8de1481 AV |
2451 | if (!__request_mem_region(pci_resource_start(pdev, bar), |
2452 | pci_resource_len(pdev, bar), res_name, | |
2453 | exclusive)) | |
1da177e4 LT |
2454 | goto err_out; |
2455 | } | |
9ac7849e TH |
2456 | |
2457 | dr = find_pci_dr(pdev); | |
2458 | if (dr) | |
2459 | dr->region_mask |= 1 << bar; | |
2460 | ||
1da177e4 LT |
2461 | return 0; |
2462 | ||
2463 | err_out: | |
c7dabef8 | 2464 | dev_warn(&pdev->dev, "BAR %d: can't reserve %pR\n", bar, |
096e6f67 | 2465 | &pdev->resource[bar]); |
1da177e4 LT |
2466 | return -EBUSY; |
2467 | } | |
2468 | ||
e8de1481 | 2469 | /** |
f5ddcac4 | 2470 | * pci_request_region - Reserve PCI I/O and memory resource |
e8de1481 AV |
2471 | * @pdev: PCI device whose resources are to be reserved |
2472 | * @bar: BAR to be reserved | |
f5ddcac4 | 2473 | * @res_name: Name to be associated with resource |
e8de1481 | 2474 | * |
f5ddcac4 | 2475 | * Mark the PCI region associated with PCI device @pdev BAR @bar as |
e8de1481 AV |
2476 | * being reserved by owner @res_name. Do not access any |
2477 | * address inside the PCI regions unless this call returns | |
2478 | * successfully. | |
2479 | * | |
2480 | * Returns 0 on success, or %EBUSY on error. A warning | |
2481 | * message is also printed on failure. | |
2482 | */ | |
2483 | int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name) | |
2484 | { | |
2485 | return __pci_request_region(pdev, bar, res_name, 0); | |
2486 | } | |
2487 | ||
2488 | /** | |
2489 | * pci_request_region_exclusive - Reserved PCI I/O and memory resource | |
2490 | * @pdev: PCI device whose resources are to be reserved | |
2491 | * @bar: BAR to be reserved | |
2492 | * @res_name: Name to be associated with resource. | |
2493 | * | |
2494 | * Mark the PCI region associated with PCI device @pdev BR @bar as | |
2495 | * being reserved by owner @res_name. Do not access any | |
2496 | * address inside the PCI regions unless this call returns | |
2497 | * successfully. | |
2498 | * | |
2499 | * Returns 0 on success, or %EBUSY on error. A warning | |
2500 | * message is also printed on failure. | |
2501 | * | |
2502 | * The key difference that _exclusive makes it that userspace is | |
2503 | * explicitly not allowed to map the resource via /dev/mem or | |
2504 | * sysfs. | |
2505 | */ | |
2506 | int pci_request_region_exclusive(struct pci_dev *pdev, int bar, const char *res_name) | |
2507 | { | |
2508 | return __pci_request_region(pdev, bar, res_name, IORESOURCE_EXCLUSIVE); | |
2509 | } | |
c87deff7 HS |
2510 | /** |
2511 | * pci_release_selected_regions - Release selected PCI I/O and memory resources | |
2512 | * @pdev: PCI device whose resources were previously reserved | |
2513 | * @bars: Bitmask of BARs to be released | |
2514 | * | |
2515 | * Release selected PCI I/O and memory resources previously reserved. | |
2516 | * Call this function only after all use of the PCI regions has ceased. | |
2517 | */ | |
2518 | void pci_release_selected_regions(struct pci_dev *pdev, int bars) | |
2519 | { | |
2520 | int i; | |
2521 | ||
2522 | for (i = 0; i < 6; i++) | |
2523 | if (bars & (1 << i)) | |
2524 | pci_release_region(pdev, i); | |
2525 | } | |
2526 | ||
e8de1481 AV |
2527 | int __pci_request_selected_regions(struct pci_dev *pdev, int bars, |
2528 | const char *res_name, int excl) | |
c87deff7 HS |
2529 | { |
2530 | int i; | |
2531 | ||
2532 | for (i = 0; i < 6; i++) | |
2533 | if (bars & (1 << i)) | |
e8de1481 | 2534 | if (__pci_request_region(pdev, i, res_name, excl)) |
c87deff7 HS |
2535 | goto err_out; |
2536 | return 0; | |
2537 | ||
2538 | err_out: | |
2539 | while(--i >= 0) | |
2540 | if (bars & (1 << i)) | |
2541 | pci_release_region(pdev, i); | |
2542 | ||
2543 | return -EBUSY; | |
2544 | } | |
1da177e4 | 2545 | |
e8de1481 AV |
2546 | |
2547 | /** | |
2548 | * pci_request_selected_regions - Reserve selected PCI I/O and memory resources | |
2549 | * @pdev: PCI device whose resources are to be reserved | |
2550 | * @bars: Bitmask of BARs to be requested | |
2551 | * @res_name: Name to be associated with resource | |
2552 | */ | |
2553 | int pci_request_selected_regions(struct pci_dev *pdev, int bars, | |
2554 | const char *res_name) | |
2555 | { | |
2556 | return __pci_request_selected_regions(pdev, bars, res_name, 0); | |
2557 | } | |
2558 | ||
2559 | int pci_request_selected_regions_exclusive(struct pci_dev *pdev, | |
2560 | int bars, const char *res_name) | |
2561 | { | |
2562 | return __pci_request_selected_regions(pdev, bars, res_name, | |
2563 | IORESOURCE_EXCLUSIVE); | |
2564 | } | |
2565 | ||
1da177e4 LT |
2566 | /** |
2567 | * pci_release_regions - Release reserved PCI I/O and memory resources | |
2568 | * @pdev: PCI device whose resources were previously reserved by pci_request_regions | |
2569 | * | |
2570 | * Releases all PCI I/O and memory resources previously reserved by a | |
2571 | * successful call to pci_request_regions. Call this function only | |
2572 | * after all use of the PCI regions has ceased. | |
2573 | */ | |
2574 | ||
2575 | void pci_release_regions(struct pci_dev *pdev) | |
2576 | { | |
c87deff7 | 2577 | pci_release_selected_regions(pdev, (1 << 6) - 1); |
1da177e4 LT |
2578 | } |
2579 | ||
2580 | /** | |
2581 | * pci_request_regions - Reserved PCI I/O and memory resources | |
2582 | * @pdev: PCI device whose resources are to be reserved | |
2583 | * @res_name: Name to be associated with resource. | |
2584 | * | |
2585 | * Mark all PCI regions associated with PCI device @pdev as | |
2586 | * being reserved by owner @res_name. Do not access any | |
2587 | * address inside the PCI regions unless this call returns | |
2588 | * successfully. | |
2589 | * | |
2590 | * Returns 0 on success, or %EBUSY on error. A warning | |
2591 | * message is also printed on failure. | |
2592 | */ | |
3c990e92 | 2593 | int pci_request_regions(struct pci_dev *pdev, const char *res_name) |
1da177e4 | 2594 | { |
c87deff7 | 2595 | return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name); |
1da177e4 LT |
2596 | } |
2597 | ||
e8de1481 AV |
2598 | /** |
2599 | * pci_request_regions_exclusive - Reserved PCI I/O and memory resources | |
2600 | * @pdev: PCI device whose resources are to be reserved | |
2601 | * @res_name: Name to be associated with resource. | |
2602 | * | |
2603 | * Mark all PCI regions associated with PCI device @pdev as | |
2604 | * being reserved by owner @res_name. Do not access any | |
2605 | * address inside the PCI regions unless this call returns | |
2606 | * successfully. | |
2607 | * | |
2608 | * pci_request_regions_exclusive() will mark the region so that | |
2609 | * /dev/mem and the sysfs MMIO access will not be allowed. | |
2610 | * | |
2611 | * Returns 0 on success, or %EBUSY on error. A warning | |
2612 | * message is also printed on failure. | |
2613 | */ | |
2614 | int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) | |
2615 | { | |
2616 | return pci_request_selected_regions_exclusive(pdev, | |
2617 | ((1 << 6) - 1), res_name); | |
2618 | } | |
2619 | ||
6a479079 BH |
2620 | static void __pci_set_master(struct pci_dev *dev, bool enable) |
2621 | { | |
2622 | u16 old_cmd, cmd; | |
2623 | ||
2624 | pci_read_config_word(dev, PCI_COMMAND, &old_cmd); | |
2625 | if (enable) | |
2626 | cmd = old_cmd | PCI_COMMAND_MASTER; | |
2627 | else | |
2628 | cmd = old_cmd & ~PCI_COMMAND_MASTER; | |
2629 | if (cmd != old_cmd) { | |
2630 | dev_dbg(&dev->dev, "%s bus mastering\n", | |
2631 | enable ? "enabling" : "disabling"); | |
2632 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
2633 | } | |
2634 | dev->is_busmaster = enable; | |
2635 | } | |
e8de1481 | 2636 | |
96c55900 MS |
2637 | /** |
2638 | * pcibios_set_master - enable PCI bus-mastering for device dev | |
2639 | * @dev: the PCI device to enable | |
2640 | * | |
2641 | * Enables PCI bus-mastering for the device. This is the default | |
2642 | * implementation. Architecture specific implementations can override | |
2643 | * this if necessary. | |
2644 | */ | |
2645 | void __weak pcibios_set_master(struct pci_dev *dev) | |
2646 | { | |
2647 | u8 lat; | |
2648 | ||
f676678f MS |
2649 | /* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */ |
2650 | if (pci_is_pcie(dev)) | |
2651 | return; | |
2652 | ||
96c55900 MS |
2653 | pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat); |
2654 | if (lat < 16) | |
2655 | lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency; | |
2656 | else if (lat > pcibios_max_latency) | |
2657 | lat = pcibios_max_latency; | |
2658 | else | |
2659 | return; | |
2660 | dev_printk(KERN_DEBUG, &dev->dev, "setting latency timer to %d\n", lat); | |
2661 | pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat); | |
2662 | } | |
2663 | ||
1da177e4 LT |
2664 | /** |
2665 | * pci_set_master - enables bus-mastering for device dev | |
2666 | * @dev: the PCI device to enable | |
2667 | * | |
2668 | * Enables bus-mastering on the device and calls pcibios_set_master() | |
2669 | * to do the needed arch specific settings. | |
2670 | */ | |
6a479079 | 2671 | void pci_set_master(struct pci_dev *dev) |
1da177e4 | 2672 | { |
6a479079 | 2673 | __pci_set_master(dev, true); |
1da177e4 LT |
2674 | pcibios_set_master(dev); |
2675 | } | |
2676 | ||
6a479079 BH |
2677 | /** |
2678 | * pci_clear_master - disables bus-mastering for device dev | |
2679 | * @dev: the PCI device to disable | |
2680 | */ | |
2681 | void pci_clear_master(struct pci_dev *dev) | |
2682 | { | |
2683 | __pci_set_master(dev, false); | |
2684 | } | |
2685 | ||
1da177e4 | 2686 | /** |
edb2d97e MW |
2687 | * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed |
2688 | * @dev: the PCI device for which MWI is to be enabled | |
1da177e4 | 2689 | * |
edb2d97e MW |
2690 | * Helper function for pci_set_mwi. |
2691 | * Originally copied from drivers/net/acenic.c. | |
1da177e4 LT |
2692 | * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>. |
2693 | * | |
2694 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2695 | */ | |
15ea76d4 | 2696 | int pci_set_cacheline_size(struct pci_dev *dev) |
1da177e4 LT |
2697 | { |
2698 | u8 cacheline_size; | |
2699 | ||
2700 | if (!pci_cache_line_size) | |
15ea76d4 | 2701 | return -EINVAL; |
1da177e4 LT |
2702 | |
2703 | /* Validate current setting: the PCI_CACHE_LINE_SIZE must be | |
2704 | equal to or multiple of the right value. */ | |
2705 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); | |
2706 | if (cacheline_size >= pci_cache_line_size && | |
2707 | (cacheline_size % pci_cache_line_size) == 0) | |
2708 | return 0; | |
2709 | ||
2710 | /* Write the correct value. */ | |
2711 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size); | |
2712 | /* Read it back. */ | |
2713 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size); | |
2714 | if (cacheline_size == pci_cache_line_size) | |
2715 | return 0; | |
2716 | ||
80ccba11 BH |
2717 | dev_printk(KERN_DEBUG, &dev->dev, "cache line size of %d is not " |
2718 | "supported\n", pci_cache_line_size << 2); | |
1da177e4 LT |
2719 | |
2720 | return -EINVAL; | |
2721 | } | |
15ea76d4 TH |
2722 | EXPORT_SYMBOL_GPL(pci_set_cacheline_size); |
2723 | ||
2724 | #ifdef PCI_DISABLE_MWI | |
2725 | int pci_set_mwi(struct pci_dev *dev) | |
2726 | { | |
2727 | return 0; | |
2728 | } | |
2729 | ||
2730 | int pci_try_set_mwi(struct pci_dev *dev) | |
2731 | { | |
2732 | return 0; | |
2733 | } | |
2734 | ||
2735 | void pci_clear_mwi(struct pci_dev *dev) | |
2736 | { | |
2737 | } | |
2738 | ||
2739 | #else | |
1da177e4 LT |
2740 | |
2741 | /** | |
2742 | * pci_set_mwi - enables memory-write-invalidate PCI transaction | |
2743 | * @dev: the PCI device for which MWI is enabled | |
2744 | * | |
694625c0 | 2745 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. |
1da177e4 LT |
2746 | * |
2747 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2748 | */ | |
2749 | int | |
2750 | pci_set_mwi(struct pci_dev *dev) | |
2751 | { | |
2752 | int rc; | |
2753 | u16 cmd; | |
2754 | ||
edb2d97e | 2755 | rc = pci_set_cacheline_size(dev); |
1da177e4 LT |
2756 | if (rc) |
2757 | return rc; | |
2758 | ||
2759 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
2760 | if (! (cmd & PCI_COMMAND_INVALIDATE)) { | |
80ccba11 | 2761 | dev_dbg(&dev->dev, "enabling Mem-Wr-Inval\n"); |
1da177e4 LT |
2762 | cmd |= PCI_COMMAND_INVALIDATE; |
2763 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
2764 | } | |
2765 | ||
2766 | return 0; | |
2767 | } | |
2768 | ||
694625c0 RD |
2769 | /** |
2770 | * pci_try_set_mwi - enables memory-write-invalidate PCI transaction | |
2771 | * @dev: the PCI device for which MWI is enabled | |
2772 | * | |
2773 | * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND. | |
2774 | * Callers are not required to check the return value. | |
2775 | * | |
2776 | * RETURNS: An appropriate -ERRNO error value on error, or zero for success. | |
2777 | */ | |
2778 | int pci_try_set_mwi(struct pci_dev *dev) | |
2779 | { | |
2780 | int rc = pci_set_mwi(dev); | |
2781 | return rc; | |
2782 | } | |
2783 | ||
1da177e4 LT |
2784 | /** |
2785 | * pci_clear_mwi - disables Memory-Write-Invalidate for device dev | |
2786 | * @dev: the PCI device to disable | |
2787 | * | |
2788 | * Disables PCI Memory-Write-Invalidate transaction on the device | |
2789 | */ | |
2790 | void | |
2791 | pci_clear_mwi(struct pci_dev *dev) | |
2792 | { | |
2793 | u16 cmd; | |
2794 | ||
2795 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
2796 | if (cmd & PCI_COMMAND_INVALIDATE) { | |
2797 | cmd &= ~PCI_COMMAND_INVALIDATE; | |
2798 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
2799 | } | |
2800 | } | |
edb2d97e | 2801 | #endif /* ! PCI_DISABLE_MWI */ |
1da177e4 | 2802 | |
a04ce0ff BR |
2803 | /** |
2804 | * pci_intx - enables/disables PCI INTx for device dev | |
8f7020d3 RD |
2805 | * @pdev: the PCI device to operate on |
2806 | * @enable: boolean: whether to enable or disable PCI INTx | |
a04ce0ff BR |
2807 | * |
2808 | * Enables/disables PCI INTx for device dev | |
2809 | */ | |
2810 | void | |
2811 | pci_intx(struct pci_dev *pdev, int enable) | |
2812 | { | |
2813 | u16 pci_command, new; | |
2814 | ||
2815 | pci_read_config_word(pdev, PCI_COMMAND, &pci_command); | |
2816 | ||
2817 | if (enable) { | |
2818 | new = pci_command & ~PCI_COMMAND_INTX_DISABLE; | |
2819 | } else { | |
2820 | new = pci_command | PCI_COMMAND_INTX_DISABLE; | |
2821 | } | |
2822 | ||
2823 | if (new != pci_command) { | |
9ac7849e TH |
2824 | struct pci_devres *dr; |
2825 | ||
2fd9d74b | 2826 | pci_write_config_word(pdev, PCI_COMMAND, new); |
9ac7849e TH |
2827 | |
2828 | dr = find_pci_dr(pdev); | |
2829 | if (dr && !dr->restore_intx) { | |
2830 | dr->restore_intx = 1; | |
2831 | dr->orig_intx = !enable; | |
2832 | } | |
a04ce0ff BR |
2833 | } |
2834 | } | |
2835 | ||
a2e27787 JK |
2836 | /** |
2837 | * pci_intx_mask_supported - probe for INTx masking support | |
6e9292c5 | 2838 | * @dev: the PCI device to operate on |
a2e27787 JK |
2839 | * |
2840 | * Check if the device dev support INTx masking via the config space | |
2841 | * command word. | |
2842 | */ | |
2843 | bool pci_intx_mask_supported(struct pci_dev *dev) | |
2844 | { | |
2845 | bool mask_supported = false; | |
2846 | u16 orig, new; | |
2847 | ||
2848 | pci_cfg_access_lock(dev); | |
2849 | ||
2850 | pci_read_config_word(dev, PCI_COMMAND, &orig); | |
2851 | pci_write_config_word(dev, PCI_COMMAND, | |
2852 | orig ^ PCI_COMMAND_INTX_DISABLE); | |
2853 | pci_read_config_word(dev, PCI_COMMAND, &new); | |
2854 | ||
2855 | /* | |
2856 | * There's no way to protect against hardware bugs or detect them | |
2857 | * reliably, but as long as we know what the value should be, let's | |
2858 | * go ahead and check it. | |
2859 | */ | |
2860 | if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) { | |
2861 | dev_err(&dev->dev, "Command register changed from " | |
2862 | "0x%x to 0x%x: driver or hardware bug?\n", orig, new); | |
2863 | } else if ((new ^ orig) & PCI_COMMAND_INTX_DISABLE) { | |
2864 | mask_supported = true; | |
2865 | pci_write_config_word(dev, PCI_COMMAND, orig); | |
2866 | } | |
2867 | ||
2868 | pci_cfg_access_unlock(dev); | |
2869 | return mask_supported; | |
2870 | } | |
2871 | EXPORT_SYMBOL_GPL(pci_intx_mask_supported); | |
2872 | ||
2873 | static bool pci_check_and_set_intx_mask(struct pci_dev *dev, bool mask) | |
2874 | { | |
2875 | struct pci_bus *bus = dev->bus; | |
2876 | bool mask_updated = true; | |
2877 | u32 cmd_status_dword; | |
2878 | u16 origcmd, newcmd; | |
2879 | unsigned long flags; | |
2880 | bool irq_pending; | |
2881 | ||
2882 | /* | |
2883 | * We do a single dword read to retrieve both command and status. | |
2884 | * Document assumptions that make this possible. | |
2885 | */ | |
2886 | BUILD_BUG_ON(PCI_COMMAND % 4); | |
2887 | BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS); | |
2888 | ||
2889 | raw_spin_lock_irqsave(&pci_lock, flags); | |
2890 | ||
2891 | bus->ops->read(bus, dev->devfn, PCI_COMMAND, 4, &cmd_status_dword); | |
2892 | ||
2893 | irq_pending = (cmd_status_dword >> 16) & PCI_STATUS_INTERRUPT; | |
2894 | ||
2895 | /* | |
2896 | * Check interrupt status register to see whether our device | |
2897 | * triggered the interrupt (when masking) or the next IRQ is | |
2898 | * already pending (when unmasking). | |
2899 | */ | |
2900 | if (mask != irq_pending) { | |
2901 | mask_updated = false; | |
2902 | goto done; | |
2903 | } | |
2904 | ||
2905 | origcmd = cmd_status_dword; | |
2906 | newcmd = origcmd & ~PCI_COMMAND_INTX_DISABLE; | |
2907 | if (mask) | |
2908 | newcmd |= PCI_COMMAND_INTX_DISABLE; | |
2909 | if (newcmd != origcmd) | |
2910 | bus->ops->write(bus, dev->devfn, PCI_COMMAND, 2, newcmd); | |
2911 | ||
2912 | done: | |
2913 | raw_spin_unlock_irqrestore(&pci_lock, flags); | |
2914 | ||
2915 | return mask_updated; | |
2916 | } | |
2917 | ||
2918 | /** | |
2919 | * pci_check_and_mask_intx - mask INTx on pending interrupt | |
6e9292c5 | 2920 | * @dev: the PCI device to operate on |
a2e27787 JK |
2921 | * |
2922 | * Check if the device dev has its INTx line asserted, mask it and | |
2923 | * return true in that case. False is returned if not interrupt was | |
2924 | * pending. | |
2925 | */ | |
2926 | bool pci_check_and_mask_intx(struct pci_dev *dev) | |
2927 | { | |
2928 | return pci_check_and_set_intx_mask(dev, true); | |
2929 | } | |
2930 | EXPORT_SYMBOL_GPL(pci_check_and_mask_intx); | |
2931 | ||
2932 | /** | |
2933 | * pci_check_and_mask_intx - unmask INTx of no interrupt is pending | |
6e9292c5 | 2934 | * @dev: the PCI device to operate on |
a2e27787 JK |
2935 | * |
2936 | * Check if the device dev has its INTx line asserted, unmask it if not | |
2937 | * and return true. False is returned and the mask remains active if | |
2938 | * there was still an interrupt pending. | |
2939 | */ | |
2940 | bool pci_check_and_unmask_intx(struct pci_dev *dev) | |
2941 | { | |
2942 | return pci_check_and_set_intx_mask(dev, false); | |
2943 | } | |
2944 | EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx); | |
2945 | ||
f5f2b131 EB |
2946 | /** |
2947 | * pci_msi_off - disables any msi or msix capabilities | |
8d7d86e9 | 2948 | * @dev: the PCI device to operate on |
f5f2b131 EB |
2949 | * |
2950 | * If you want to use msi see pci_enable_msi and friends. | |
2951 | * This is a lower level primitive that allows us to disable | |
2952 | * msi operation at the device level. | |
2953 | */ | |
2954 | void pci_msi_off(struct pci_dev *dev) | |
2955 | { | |
2956 | int pos; | |
2957 | u16 control; | |
2958 | ||
2959 | pos = pci_find_capability(dev, PCI_CAP_ID_MSI); | |
2960 | if (pos) { | |
2961 | pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control); | |
2962 | control &= ~PCI_MSI_FLAGS_ENABLE; | |
2963 | pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control); | |
2964 | } | |
2965 | pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); | |
2966 | if (pos) { | |
2967 | pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control); | |
2968 | control &= ~PCI_MSIX_FLAGS_ENABLE; | |
2969 | pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control); | |
2970 | } | |
2971 | } | |
b03214d5 | 2972 | EXPORT_SYMBOL_GPL(pci_msi_off); |
f5f2b131 | 2973 | |
4d57cdfa FT |
2974 | int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size) |
2975 | { | |
2976 | return dma_set_max_seg_size(&dev->dev, size); | |
2977 | } | |
2978 | EXPORT_SYMBOL(pci_set_dma_max_seg_size); | |
4d57cdfa | 2979 | |
59fc67de FT |
2980 | int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask) |
2981 | { | |
2982 | return dma_set_seg_boundary(&dev->dev, mask); | |
2983 | } | |
2984 | EXPORT_SYMBOL(pci_set_dma_seg_boundary); | |
59fc67de | 2985 | |
8c1c699f | 2986 | static int pcie_flr(struct pci_dev *dev, int probe) |
8dd7f803 | 2987 | { |
8c1c699f YZ |
2988 | int i; |
2989 | int pos; | |
8dd7f803 | 2990 | u32 cap; |
04b55c47 | 2991 | u16 status, control; |
8dd7f803 | 2992 | |
06a1cbaf | 2993 | pos = pci_pcie_cap(dev); |
8c1c699f | 2994 | if (!pos) |
8dd7f803 | 2995 | return -ENOTTY; |
8c1c699f YZ |
2996 | |
2997 | pci_read_config_dword(dev, pos + PCI_EXP_DEVCAP, &cap); | |
8dd7f803 SY |
2998 | if (!(cap & PCI_EXP_DEVCAP_FLR)) |
2999 | return -ENOTTY; | |
3000 | ||
d91cdc74 SY |
3001 | if (probe) |
3002 | return 0; | |
3003 | ||
8dd7f803 | 3004 | /* Wait for Transaction Pending bit clean */ |
8c1c699f YZ |
3005 | for (i = 0; i < 4; i++) { |
3006 | if (i) | |
3007 | msleep((1 << (i - 1)) * 100); | |
5fe5db05 | 3008 | |
8c1c699f YZ |
3009 | pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &status); |
3010 | if (!(status & PCI_EXP_DEVSTA_TRPND)) | |
3011 | goto clear; | |
3012 | } | |
3013 | ||
3014 | dev_err(&dev->dev, "transaction is not cleared; " | |
3015 | "proceeding with reset anyway\n"); | |
3016 | ||
3017 | clear: | |
04b55c47 SR |
3018 | pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &control); |
3019 | control |= PCI_EXP_DEVCTL_BCR_FLR; | |
3020 | pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, control); | |
3021 | ||
8c1c699f | 3022 | msleep(100); |
8dd7f803 | 3023 | |
8dd7f803 SY |
3024 | return 0; |
3025 | } | |
d91cdc74 | 3026 | |
8c1c699f | 3027 | static int pci_af_flr(struct pci_dev *dev, int probe) |
1ca88797 | 3028 | { |
8c1c699f YZ |
3029 | int i; |
3030 | int pos; | |
1ca88797 | 3031 | u8 cap; |
8c1c699f | 3032 | u8 status; |
1ca88797 | 3033 | |
8c1c699f YZ |
3034 | pos = pci_find_capability(dev, PCI_CAP_ID_AF); |
3035 | if (!pos) | |
1ca88797 | 3036 | return -ENOTTY; |
8c1c699f YZ |
3037 | |
3038 | pci_read_config_byte(dev, pos + PCI_AF_CAP, &cap); | |
1ca88797 SY |
3039 | if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR)) |
3040 | return -ENOTTY; | |
3041 | ||
3042 | if (probe) | |
3043 | return 0; | |
3044 | ||
1ca88797 | 3045 | /* Wait for Transaction Pending bit clean */ |
8c1c699f YZ |
3046 | for (i = 0; i < 4; i++) { |
3047 | if (i) | |
3048 | msleep((1 << (i - 1)) * 100); | |
3049 | ||
3050 | pci_read_config_byte(dev, pos + PCI_AF_STATUS, &status); | |
3051 | if (!(status & PCI_AF_STATUS_TP)) | |
3052 | goto clear; | |
3053 | } | |
5fe5db05 | 3054 | |
8c1c699f YZ |
3055 | dev_err(&dev->dev, "transaction is not cleared; " |
3056 | "proceeding with reset anyway\n"); | |
5fe5db05 | 3057 | |
8c1c699f YZ |
3058 | clear: |
3059 | pci_write_config_byte(dev, pos + PCI_AF_CTRL, PCI_AF_CTRL_FLR); | |
1ca88797 | 3060 | msleep(100); |
8c1c699f | 3061 | |
1ca88797 SY |
3062 | return 0; |
3063 | } | |
3064 | ||
83d74e03 RW |
3065 | /** |
3066 | * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0. | |
3067 | * @dev: Device to reset. | |
3068 | * @probe: If set, only check if the device can be reset this way. | |
3069 | * | |
3070 | * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is | |
3071 | * unset, it will be reinitialized internally when going from PCI_D3hot to | |
3072 | * PCI_D0. If that's the case and the device is not in a low-power state | |
3073 | * already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset. | |
3074 | * | |
3075 | * NOTE: This causes the caller to sleep for twice the device power transition | |
3076 | * cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms | |
3077 | * by devault (i.e. unless the @dev's d3_delay field has a different value). | |
3078 | * Moreover, only devices in D0 can be reset by this function. | |
3079 | */ | |
f85876ba | 3080 | static int pci_pm_reset(struct pci_dev *dev, int probe) |
d91cdc74 | 3081 | { |
f85876ba YZ |
3082 | u16 csr; |
3083 | ||
3084 | if (!dev->pm_cap) | |
3085 | return -ENOTTY; | |
d91cdc74 | 3086 | |
f85876ba YZ |
3087 | pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &csr); |
3088 | if (csr & PCI_PM_CTRL_NO_SOFT_RESET) | |
3089 | return -ENOTTY; | |
d91cdc74 | 3090 | |
f85876ba YZ |
3091 | if (probe) |
3092 | return 0; | |
1ca88797 | 3093 | |
f85876ba YZ |
3094 | if (dev->current_state != PCI_D0) |
3095 | return -EINVAL; | |
3096 | ||
3097 | csr &= ~PCI_PM_CTRL_STATE_MASK; | |
3098 | csr |= PCI_D3hot; | |
3099 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr); | |
1ae861e6 | 3100 | pci_dev_d3_sleep(dev); |
f85876ba YZ |
3101 | |
3102 | csr &= ~PCI_PM_CTRL_STATE_MASK; | |
3103 | csr |= PCI_D0; | |
3104 | pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr); | |
1ae861e6 | 3105 | pci_dev_d3_sleep(dev); |
f85876ba YZ |
3106 | |
3107 | return 0; | |
3108 | } | |
3109 | ||
c12ff1df YZ |
3110 | static int pci_parent_bus_reset(struct pci_dev *dev, int probe) |
3111 | { | |
3112 | u16 ctrl; | |
3113 | struct pci_dev *pdev; | |
3114 | ||
654b75e0 | 3115 | if (pci_is_root_bus(dev->bus) || dev->subordinate || !dev->bus->self) |
c12ff1df YZ |
3116 | return -ENOTTY; |
3117 | ||
3118 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) | |
3119 | if (pdev != dev) | |
3120 | return -ENOTTY; | |
3121 | ||
3122 | if (probe) | |
3123 | return 0; | |
3124 | ||
3125 | pci_read_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, &ctrl); | |
3126 | ctrl |= PCI_BRIDGE_CTL_BUS_RESET; | |
3127 | pci_write_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, ctrl); | |
3128 | msleep(100); | |
3129 | ||
3130 | ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET; | |
3131 | pci_write_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, ctrl); | |
3132 | msleep(100); | |
3133 | ||
3134 | return 0; | |
3135 | } | |
3136 | ||
8c1c699f | 3137 | static int pci_dev_reset(struct pci_dev *dev, int probe) |
d91cdc74 | 3138 | { |
8c1c699f YZ |
3139 | int rc; |
3140 | ||
3141 | might_sleep(); | |
3142 | ||
3143 | if (!probe) { | |
fb51ccbf | 3144 | pci_cfg_access_lock(dev); |
8c1c699f | 3145 | /* block PM suspend, driver probe, etc. */ |
8e9394ce | 3146 | device_lock(&dev->dev); |
8c1c699f | 3147 | } |
d91cdc74 | 3148 | |
b9c3b266 DC |
3149 | rc = pci_dev_specific_reset(dev, probe); |
3150 | if (rc != -ENOTTY) | |
3151 | goto done; | |
3152 | ||
8c1c699f YZ |
3153 | rc = pcie_flr(dev, probe); |
3154 | if (rc != -ENOTTY) | |
3155 | goto done; | |
d91cdc74 | 3156 | |
8c1c699f | 3157 | rc = pci_af_flr(dev, probe); |
f85876ba YZ |
3158 | if (rc != -ENOTTY) |
3159 | goto done; | |
3160 | ||
3161 | rc = pci_pm_reset(dev, probe); | |
c12ff1df YZ |
3162 | if (rc != -ENOTTY) |
3163 | goto done; | |
3164 | ||
3165 | rc = pci_parent_bus_reset(dev, probe); | |
8c1c699f YZ |
3166 | done: |
3167 | if (!probe) { | |
8e9394ce | 3168 | device_unlock(&dev->dev); |
fb51ccbf | 3169 | pci_cfg_access_unlock(dev); |
8c1c699f | 3170 | } |
1ca88797 | 3171 | |
8c1c699f | 3172 | return rc; |
d91cdc74 SY |
3173 | } |
3174 | ||
3175 | /** | |
8c1c699f YZ |
3176 | * __pci_reset_function - reset a PCI device function |
3177 | * @dev: PCI device to reset | |
d91cdc74 SY |
3178 | * |
3179 | * Some devices allow an individual function to be reset without affecting | |
3180 | * other functions in the same device. The PCI device must be responsive | |
3181 | * to PCI config space in order to use this function. | |
3182 | * | |
3183 | * The device function is presumed to be unused when this function is called. | |
3184 | * Resetting the device will make the contents of PCI configuration space | |
3185 | * random, so any caller of this must be prepared to reinitialise the | |
3186 | * device including MSI, bus mastering, BARs, decoding IO and memory spaces, | |
3187 | * etc. | |
3188 | * | |
8c1c699f | 3189 | * Returns 0 if the device function was successfully reset or negative if the |
d91cdc74 SY |
3190 | * device doesn't support resetting a single function. |
3191 | */ | |
8c1c699f | 3192 | int __pci_reset_function(struct pci_dev *dev) |
d91cdc74 | 3193 | { |
8c1c699f | 3194 | return pci_dev_reset(dev, 0); |
d91cdc74 | 3195 | } |
8c1c699f | 3196 | EXPORT_SYMBOL_GPL(__pci_reset_function); |
8dd7f803 | 3197 | |
6fbf9e7a KRW |
3198 | /** |
3199 | * __pci_reset_function_locked - reset a PCI device function while holding | |
3200 | * the @dev mutex lock. | |
3201 | * @dev: PCI device to reset | |
3202 | * | |
3203 | * Some devices allow an individual function to be reset without affecting | |
3204 | * other functions in the same device. The PCI device must be responsive | |
3205 | * to PCI config space in order to use this function. | |
3206 | * | |
3207 | * The device function is presumed to be unused and the caller is holding | |
3208 | * the device mutex lock when this function is called. | |
3209 | * Resetting the device will make the contents of PCI configuration space | |
3210 | * random, so any caller of this must be prepared to reinitialise the | |
3211 | * device including MSI, bus mastering, BARs, decoding IO and memory spaces, | |
3212 | * etc. | |
3213 | * | |
3214 | * Returns 0 if the device function was successfully reset or negative if the | |
3215 | * device doesn't support resetting a single function. | |
3216 | */ | |
3217 | int __pci_reset_function_locked(struct pci_dev *dev) | |
3218 | { | |
3219 | return pci_dev_reset(dev, 1); | |
3220 | } | |
3221 | EXPORT_SYMBOL_GPL(__pci_reset_function_locked); | |
3222 | ||
711d5779 MT |
3223 | /** |
3224 | * pci_probe_reset_function - check whether the device can be safely reset | |
3225 | * @dev: PCI device to reset | |
3226 | * | |
3227 | * Some devices allow an individual function to be reset without affecting | |
3228 | * other functions in the same device. The PCI device must be responsive | |
3229 | * to PCI config space in order to use this function. | |
3230 | * | |
3231 | * Returns 0 if the device function can be reset or negative if the | |
3232 | * device doesn't support resetting a single function. | |
3233 | */ | |
3234 | int pci_probe_reset_function(struct pci_dev *dev) | |
3235 | { | |
3236 | return pci_dev_reset(dev, 1); | |
3237 | } | |
3238 | ||
8dd7f803 | 3239 | /** |
8c1c699f YZ |
3240 | * pci_reset_function - quiesce and reset a PCI device function |
3241 | * @dev: PCI device to reset | |
8dd7f803 SY |
3242 | * |
3243 | * Some devices allow an individual function to be reset without affecting | |
3244 | * other functions in the same device. The PCI device must be responsive | |
3245 | * to PCI config space in order to use this function. | |
3246 | * | |
3247 | * This function does not just reset the PCI portion of a device, but | |
3248 | * clears all the state associated with the device. This function differs | |
8c1c699f | 3249 | * from __pci_reset_function in that it saves and restores device state |
8dd7f803 SY |
3250 | * over the reset. |
3251 | * | |
8c1c699f | 3252 | * Returns 0 if the device function was successfully reset or negative if the |
8dd7f803 SY |
3253 | * device doesn't support resetting a single function. |
3254 | */ | |
3255 | int pci_reset_function(struct pci_dev *dev) | |
3256 | { | |
8c1c699f | 3257 | int rc; |
8dd7f803 | 3258 | |
8c1c699f YZ |
3259 | rc = pci_dev_reset(dev, 1); |
3260 | if (rc) | |
3261 | return rc; | |
8dd7f803 | 3262 | |
8dd7f803 SY |
3263 | pci_save_state(dev); |
3264 | ||
8c1c699f YZ |
3265 | /* |
3266 | * both INTx and MSI are disabled after the Interrupt Disable bit | |
3267 | * is set and the Bus Master bit is cleared. | |
3268 | */ | |
8dd7f803 SY |
3269 | pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); |
3270 | ||
8c1c699f | 3271 | rc = pci_dev_reset(dev, 0); |
8dd7f803 SY |
3272 | |
3273 | pci_restore_state(dev); | |
8dd7f803 | 3274 | |
8c1c699f | 3275 | return rc; |
8dd7f803 SY |
3276 | } |
3277 | EXPORT_SYMBOL_GPL(pci_reset_function); | |
3278 | ||
d556ad4b PO |
3279 | /** |
3280 | * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count | |
3281 | * @dev: PCI device to query | |
3282 | * | |
3283 | * Returns mmrbc: maximum designed memory read count in bytes | |
3284 | * or appropriate error value. | |
3285 | */ | |
3286 | int pcix_get_max_mmrbc(struct pci_dev *dev) | |
3287 | { | |
7c9e2b1c | 3288 | int cap; |
d556ad4b PO |
3289 | u32 stat; |
3290 | ||
3291 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
3292 | if (!cap) | |
3293 | return -EINVAL; | |
3294 | ||
7c9e2b1c | 3295 | if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat)) |
d556ad4b PO |
3296 | return -EINVAL; |
3297 | ||
25daeb55 | 3298 | return 512 << ((stat & PCI_X_STATUS_MAX_READ) >> 21); |
d556ad4b PO |
3299 | } |
3300 | EXPORT_SYMBOL(pcix_get_max_mmrbc); | |
3301 | ||
3302 | /** | |
3303 | * pcix_get_mmrbc - get PCI-X maximum memory read byte count | |
3304 | * @dev: PCI device to query | |
3305 | * | |
3306 | * Returns mmrbc: maximum memory read count in bytes | |
3307 | * or appropriate error value. | |
3308 | */ | |
3309 | int pcix_get_mmrbc(struct pci_dev *dev) | |
3310 | { | |
7c9e2b1c | 3311 | int cap; |
bdc2bda7 | 3312 | u16 cmd; |
d556ad4b PO |
3313 | |
3314 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
3315 | if (!cap) | |
3316 | return -EINVAL; | |
3317 | ||
7c9e2b1c DN |
3318 | if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd)) |
3319 | return -EINVAL; | |
d556ad4b | 3320 | |
7c9e2b1c | 3321 | return 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2); |
d556ad4b PO |
3322 | } |
3323 | EXPORT_SYMBOL(pcix_get_mmrbc); | |
3324 | ||
3325 | /** | |
3326 | * pcix_set_mmrbc - set PCI-X maximum memory read byte count | |
3327 | * @dev: PCI device to query | |
3328 | * @mmrbc: maximum memory read count in bytes | |
3329 | * valid values are 512, 1024, 2048, 4096 | |
3330 | * | |
3331 | * If possible sets maximum memory read byte count, some bridges have erratas | |
3332 | * that prevent this. | |
3333 | */ | |
3334 | int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc) | |
3335 | { | |
7c9e2b1c | 3336 | int cap; |
bdc2bda7 DN |
3337 | u32 stat, v, o; |
3338 | u16 cmd; | |
d556ad4b | 3339 | |
229f5afd | 3340 | if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc)) |
7c9e2b1c | 3341 | return -EINVAL; |
d556ad4b PO |
3342 | |
3343 | v = ffs(mmrbc) - 10; | |
3344 | ||
3345 | cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); | |
3346 | if (!cap) | |
7c9e2b1c | 3347 | return -EINVAL; |
d556ad4b | 3348 | |
7c9e2b1c DN |
3349 | if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat)) |
3350 | return -EINVAL; | |
d556ad4b PO |
3351 | |
3352 | if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21) | |
3353 | return -E2BIG; | |
3354 | ||
7c9e2b1c DN |
3355 | if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd)) |
3356 | return -EINVAL; | |
d556ad4b PO |
3357 | |
3358 | o = (cmd & PCI_X_CMD_MAX_READ) >> 2; | |
3359 | if (o != v) { | |
3360 | if (v > o && dev->bus && | |
3361 | (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC)) | |
3362 | return -EIO; | |
3363 | ||
3364 | cmd &= ~PCI_X_CMD_MAX_READ; | |
3365 | cmd |= v << 2; | |
7c9e2b1c DN |
3366 | if (pci_write_config_word(dev, cap + PCI_X_CMD, cmd)) |
3367 | return -EIO; | |
d556ad4b | 3368 | } |
7c9e2b1c | 3369 | return 0; |
d556ad4b PO |
3370 | } |
3371 | EXPORT_SYMBOL(pcix_set_mmrbc); | |
3372 | ||
3373 | /** | |
3374 | * pcie_get_readrq - get PCI Express read request size | |
3375 | * @dev: PCI device to query | |
3376 | * | |
3377 | * Returns maximum memory read request in bytes | |
3378 | * or appropriate error value. | |
3379 | */ | |
3380 | int pcie_get_readrq(struct pci_dev *dev) | |
3381 | { | |
3382 | int ret, cap; | |
3383 | u16 ctl; | |
3384 | ||
06a1cbaf | 3385 | cap = pci_pcie_cap(dev); |
d556ad4b PO |
3386 | if (!cap) |
3387 | return -EINVAL; | |
3388 | ||
3389 | ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); | |
3390 | if (!ret) | |
93e75fab | 3391 | ret = 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12); |
d556ad4b PO |
3392 | |
3393 | return ret; | |
3394 | } | |
3395 | EXPORT_SYMBOL(pcie_get_readrq); | |
3396 | ||
3397 | /** | |
3398 | * pcie_set_readrq - set PCI Express maximum memory read request | |
3399 | * @dev: PCI device to query | |
42e61f4a | 3400 | * @rq: maximum memory read count in bytes |
d556ad4b PO |
3401 | * valid values are 128, 256, 512, 1024, 2048, 4096 |
3402 | * | |
c9b378c7 | 3403 | * If possible sets maximum memory read request in bytes |
d556ad4b PO |
3404 | */ |
3405 | int pcie_set_readrq(struct pci_dev *dev, int rq) | |
3406 | { | |
3407 | int cap, err = -EINVAL; | |
3408 | u16 ctl, v; | |
3409 | ||
229f5afd | 3410 | if (rq < 128 || rq > 4096 || !is_power_of_2(rq)) |
d556ad4b PO |
3411 | goto out; |
3412 | ||
06a1cbaf | 3413 | cap = pci_pcie_cap(dev); |
d556ad4b PO |
3414 | if (!cap) |
3415 | goto out; | |
3416 | ||
3417 | err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); | |
3418 | if (err) | |
3419 | goto out; | |
a1c473aa BH |
3420 | /* |
3421 | * If using the "performance" PCIe config, we clamp the | |
3422 | * read rq size to the max packet size to prevent the | |
3423 | * host bridge generating requests larger than we can | |
3424 | * cope with | |
3425 | */ | |
3426 | if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { | |
3427 | int mps = pcie_get_mps(dev); | |
3428 | ||
3429 | if (mps < 0) | |
3430 | return mps; | |
3431 | if (mps < rq) | |
3432 | rq = mps; | |
3433 | } | |
3434 | ||
3435 | v = (ffs(rq) - 8) << 12; | |
d556ad4b PO |
3436 | |
3437 | if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) { | |
3438 | ctl &= ~PCI_EXP_DEVCTL_READRQ; | |
3439 | ctl |= v; | |
c9b378c7 | 3440 | err = pci_write_config_word(dev, cap + PCI_EXP_DEVCTL, ctl); |
d556ad4b PO |
3441 | } |
3442 | ||
3443 | out: | |
3444 | return err; | |
3445 | } | |
3446 | EXPORT_SYMBOL(pcie_set_readrq); | |
3447 | ||
b03e7495 JM |
3448 | /** |
3449 | * pcie_get_mps - get PCI Express maximum payload size | |
3450 | * @dev: PCI device to query | |
3451 | * | |
3452 | * Returns maximum payload size in bytes | |
3453 | * or appropriate error value. | |
3454 | */ | |
3455 | int pcie_get_mps(struct pci_dev *dev) | |
3456 | { | |
3457 | int ret, cap; | |
3458 | u16 ctl; | |
3459 | ||
3460 | cap = pci_pcie_cap(dev); | |
3461 | if (!cap) | |
3462 | return -EINVAL; | |
3463 | ||
3464 | ret = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); | |
3465 | if (!ret) | |
3466 | ret = 128 << ((ctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5); | |
3467 | ||
3468 | return ret; | |
3469 | } | |
3470 | ||
3471 | /** | |
3472 | * pcie_set_mps - set PCI Express maximum payload size | |
3473 | * @dev: PCI device to query | |
47c08f31 | 3474 | * @mps: maximum payload size in bytes |
b03e7495 JM |
3475 | * valid values are 128, 256, 512, 1024, 2048, 4096 |
3476 | * | |
3477 | * If possible sets maximum payload size | |
3478 | */ | |
3479 | int pcie_set_mps(struct pci_dev *dev, int mps) | |
3480 | { | |
3481 | int cap, err = -EINVAL; | |
3482 | u16 ctl, v; | |
3483 | ||
3484 | if (mps < 128 || mps > 4096 || !is_power_of_2(mps)) | |
3485 | goto out; | |
3486 | ||
3487 | v = ffs(mps) - 8; | |
3488 | if (v > dev->pcie_mpss) | |
3489 | goto out; | |
3490 | v <<= 5; | |
3491 | ||
3492 | cap = pci_pcie_cap(dev); | |
3493 | if (!cap) | |
3494 | goto out; | |
3495 | ||
3496 | err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl); | |
3497 | if (err) | |
3498 | goto out; | |
3499 | ||
3500 | if ((ctl & PCI_EXP_DEVCTL_PAYLOAD) != v) { | |
3501 | ctl &= ~PCI_EXP_DEVCTL_PAYLOAD; | |
3502 | ctl |= v; | |
3503 | err = pci_write_config_word(dev, cap + PCI_EXP_DEVCTL, ctl); | |
3504 | } | |
3505 | out: | |
3506 | return err; | |
3507 | } | |
3508 | ||
c87deff7 HS |
3509 | /** |
3510 | * pci_select_bars - Make BAR mask from the type of resource | |
f95d882d | 3511 | * @dev: the PCI device for which BAR mask is made |
c87deff7 HS |
3512 | * @flags: resource type mask to be selected |
3513 | * | |
3514 | * This helper routine makes bar mask from the type of resource. | |
3515 | */ | |
3516 | int pci_select_bars(struct pci_dev *dev, unsigned long flags) | |
3517 | { | |
3518 | int i, bars = 0; | |
3519 | for (i = 0; i < PCI_NUM_RESOURCES; i++) | |
3520 | if (pci_resource_flags(dev, i) & flags) | |
3521 | bars |= (1 << i); | |
3522 | return bars; | |
3523 | } | |
3524 | ||
613e7ed6 YZ |
3525 | /** |
3526 | * pci_resource_bar - get position of the BAR associated with a resource | |
3527 | * @dev: the PCI device | |
3528 | * @resno: the resource number | |
3529 | * @type: the BAR type to be filled in | |
3530 | * | |
3531 | * Returns BAR position in config space, or 0 if the BAR is invalid. | |
3532 | */ | |
3533 | int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type) | |
3534 | { | |
d1b054da YZ |
3535 | int reg; |
3536 | ||
613e7ed6 YZ |
3537 | if (resno < PCI_ROM_RESOURCE) { |
3538 | *type = pci_bar_unknown; | |
3539 | return PCI_BASE_ADDRESS_0 + 4 * resno; | |
3540 | } else if (resno == PCI_ROM_RESOURCE) { | |
3541 | *type = pci_bar_mem32; | |
3542 | return dev->rom_base_reg; | |
d1b054da YZ |
3543 | } else if (resno < PCI_BRIDGE_RESOURCES) { |
3544 | /* device specific resource */ | |
3545 | reg = pci_iov_resource_bar(dev, resno, type); | |
3546 | if (reg) | |
3547 | return reg; | |
613e7ed6 YZ |
3548 | } |
3549 | ||
865df576 | 3550 | dev_err(&dev->dev, "BAR %d: invalid resource\n", resno); |
613e7ed6 YZ |
3551 | return 0; |
3552 | } | |
3553 | ||
95a8b6ef MT |
3554 | /* Some architectures require additional programming to enable VGA */ |
3555 | static arch_set_vga_state_t arch_set_vga_state; | |
3556 | ||
3557 | void __init pci_register_set_vga_state(arch_set_vga_state_t func) | |
3558 | { | |
3559 | arch_set_vga_state = func; /* NULL disables */ | |
3560 | } | |
3561 | ||
3562 | static int pci_set_vga_state_arch(struct pci_dev *dev, bool decode, | |
7ad35cf2 | 3563 | unsigned int command_bits, u32 flags) |
95a8b6ef MT |
3564 | { |
3565 | if (arch_set_vga_state) | |
3566 | return arch_set_vga_state(dev, decode, command_bits, | |
7ad35cf2 | 3567 | flags); |
95a8b6ef MT |
3568 | return 0; |
3569 | } | |
3570 | ||
deb2d2ec BH |
3571 | /** |
3572 | * pci_set_vga_state - set VGA decode state on device and parents if requested | |
19eea630 RD |
3573 | * @dev: the PCI device |
3574 | * @decode: true = enable decoding, false = disable decoding | |
3575 | * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY | |
3f37d622 | 3576 | * @flags: traverse ancestors and change bridges |
3448a19d | 3577 | * CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE |
deb2d2ec BH |
3578 | */ |
3579 | int pci_set_vga_state(struct pci_dev *dev, bool decode, | |
3448a19d | 3580 | unsigned int command_bits, u32 flags) |
deb2d2ec BH |
3581 | { |
3582 | struct pci_bus *bus; | |
3583 | struct pci_dev *bridge; | |
3584 | u16 cmd; | |
95a8b6ef | 3585 | int rc; |
deb2d2ec | 3586 | |
3448a19d | 3587 | WARN_ON((flags & PCI_VGA_STATE_CHANGE_DECODES) & (command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY))); |
deb2d2ec | 3588 | |
95a8b6ef | 3589 | /* ARCH specific VGA enables */ |
3448a19d | 3590 | rc = pci_set_vga_state_arch(dev, decode, command_bits, flags); |
95a8b6ef MT |
3591 | if (rc) |
3592 | return rc; | |
3593 | ||
3448a19d DA |
3594 | if (flags & PCI_VGA_STATE_CHANGE_DECODES) { |
3595 | pci_read_config_word(dev, PCI_COMMAND, &cmd); | |
3596 | if (decode == true) | |
3597 | cmd |= command_bits; | |
3598 | else | |
3599 | cmd &= ~command_bits; | |
3600 | pci_write_config_word(dev, PCI_COMMAND, cmd); | |
3601 | } | |
deb2d2ec | 3602 | |
3448a19d | 3603 | if (!(flags & PCI_VGA_STATE_CHANGE_BRIDGE)) |
deb2d2ec BH |
3604 | return 0; |
3605 | ||
3606 | bus = dev->bus; | |
3607 | while (bus) { | |
3608 | bridge = bus->self; | |
3609 | if (bridge) { | |
3610 | pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, | |
3611 | &cmd); | |
3612 | if (decode == true) | |
3613 | cmd |= PCI_BRIDGE_CTL_VGA; | |
3614 | else | |
3615 | cmd &= ~PCI_BRIDGE_CTL_VGA; | |
3616 | pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, | |
3617 | cmd); | |
3618 | } | |
3619 | bus = bus->parent; | |
3620 | } | |
3621 | return 0; | |
3622 | } | |
3623 | ||
32a9a682 YS |
3624 | #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE |
3625 | static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0}; | |
e9d1e492 | 3626 | static DEFINE_SPINLOCK(resource_alignment_lock); |
32a9a682 YS |
3627 | |
3628 | /** | |
3629 | * pci_specified_resource_alignment - get resource alignment specified by user. | |
3630 | * @dev: the PCI device to get | |
3631 | * | |
3632 | * RETURNS: Resource alignment if it is specified. | |
3633 | * Zero if it is not specified. | |
3634 | */ | |
3635 | resource_size_t pci_specified_resource_alignment(struct pci_dev *dev) | |
3636 | { | |
3637 | int seg, bus, slot, func, align_order, count; | |
3638 | resource_size_t align = 0; | |
3639 | char *p; | |
3640 | ||
3641 | spin_lock(&resource_alignment_lock); | |
3642 | p = resource_alignment_param; | |
3643 | while (*p) { | |
3644 | count = 0; | |
3645 | if (sscanf(p, "%d%n", &align_order, &count) == 1 && | |
3646 | p[count] == '@') { | |
3647 | p += count + 1; | |
3648 | } else { | |
3649 | align_order = -1; | |
3650 | } | |
3651 | if (sscanf(p, "%x:%x:%x.%x%n", | |
3652 | &seg, &bus, &slot, &func, &count) != 4) { | |
3653 | seg = 0; | |
3654 | if (sscanf(p, "%x:%x.%x%n", | |
3655 | &bus, &slot, &func, &count) != 3) { | |
3656 | /* Invalid format */ | |
3657 | printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n", | |
3658 | p); | |
3659 | break; | |
3660 | } | |
3661 | } | |
3662 | p += count; | |
3663 | if (seg == pci_domain_nr(dev->bus) && | |
3664 | bus == dev->bus->number && | |
3665 | slot == PCI_SLOT(dev->devfn) && | |
3666 | func == PCI_FUNC(dev->devfn)) { | |
3667 | if (align_order == -1) { | |
3668 | align = PAGE_SIZE; | |
3669 | } else { | |
3670 | align = 1 << align_order; | |
3671 | } | |
3672 | /* Found */ | |
3673 | break; | |
3674 | } | |
3675 | if (*p != ';' && *p != ',') { | |
3676 | /* End of param or invalid format */ | |
3677 | break; | |
3678 | } | |
3679 | p++; | |
3680 | } | |
3681 | spin_unlock(&resource_alignment_lock); | |
3682 | return align; | |
3683 | } | |
3684 | ||
3685 | /** | |
3686 | * pci_is_reassigndev - check if specified PCI is target device to reassign | |
3687 | * @dev: the PCI device to check | |
3688 | * | |
3689 | * RETURNS: non-zero for PCI device is a target device to reassign, | |
3690 | * or zero is not. | |
3691 | */ | |
3692 | int pci_is_reassigndev(struct pci_dev *dev) | |
3693 | { | |
3694 | return (pci_specified_resource_alignment(dev) != 0); | |
3695 | } | |
3696 | ||
3697 | ssize_t pci_set_resource_alignment_param(const char *buf, size_t count) | |
3698 | { | |
3699 | if (count > RESOURCE_ALIGNMENT_PARAM_SIZE - 1) | |
3700 | count = RESOURCE_ALIGNMENT_PARAM_SIZE - 1; | |
3701 | spin_lock(&resource_alignment_lock); | |
3702 | strncpy(resource_alignment_param, buf, count); | |
3703 | resource_alignment_param[count] = '\0'; | |
3704 | spin_unlock(&resource_alignment_lock); | |
3705 | return count; | |
3706 | } | |
3707 | ||
3708 | ssize_t pci_get_resource_alignment_param(char *buf, size_t size) | |
3709 | { | |
3710 | size_t count; | |
3711 | spin_lock(&resource_alignment_lock); | |
3712 | count = snprintf(buf, size, "%s", resource_alignment_param); | |
3713 | spin_unlock(&resource_alignment_lock); | |
3714 | return count; | |
3715 | } | |
3716 | ||
3717 | static ssize_t pci_resource_alignment_show(struct bus_type *bus, char *buf) | |
3718 | { | |
3719 | return pci_get_resource_alignment_param(buf, PAGE_SIZE); | |
3720 | } | |
3721 | ||
3722 | static ssize_t pci_resource_alignment_store(struct bus_type *bus, | |
3723 | const char *buf, size_t count) | |
3724 | { | |
3725 | return pci_set_resource_alignment_param(buf, count); | |
3726 | } | |
3727 | ||
3728 | BUS_ATTR(resource_alignment, 0644, pci_resource_alignment_show, | |
3729 | pci_resource_alignment_store); | |
3730 | ||
3731 | static int __init pci_resource_alignment_sysfs_init(void) | |
3732 | { | |
3733 | return bus_create_file(&pci_bus_type, | |
3734 | &bus_attr_resource_alignment); | |
3735 | } | |
3736 | ||
3737 | late_initcall(pci_resource_alignment_sysfs_init); | |
3738 | ||
32a2eea7 JG |
3739 | static void __devinit pci_no_domains(void) |
3740 | { | |
3741 | #ifdef CONFIG_PCI_DOMAINS | |
3742 | pci_domains_supported = 0; | |
3743 | #endif | |
3744 | } | |
3745 | ||
0ef5f8f6 AP |
3746 | /** |
3747 | * pci_ext_cfg_enabled - can we access extended PCI config space? | |
3748 | * @dev: The PCI device of the root bridge. | |
3749 | * | |
3750 | * Returns 1 if we can access PCI extended config space (offsets | |
3751 | * greater than 0xff). This is the default implementation. Architecture | |
3752 | * implementations can override this. | |
3753 | */ | |
3754 | int __attribute__ ((weak)) pci_ext_cfg_avail(struct pci_dev *dev) | |
3755 | { | |
3756 | return 1; | |
3757 | } | |
3758 | ||
2d1c8618 BH |
3759 | void __weak pci_fixup_cardbus(struct pci_bus *bus) |
3760 | { | |
3761 | } | |
3762 | EXPORT_SYMBOL(pci_fixup_cardbus); | |
3763 | ||
ad04d31e | 3764 | static int __init pci_setup(char *str) |
1da177e4 LT |
3765 | { |
3766 | while (str) { | |
3767 | char *k = strchr(str, ','); | |
3768 | if (k) | |
3769 | *k++ = 0; | |
3770 | if (*str && (str = pcibios_setup(str)) && *str) { | |
309e57df MW |
3771 | if (!strcmp(str, "nomsi")) { |
3772 | pci_no_msi(); | |
7f785763 RD |
3773 | } else if (!strcmp(str, "noaer")) { |
3774 | pci_no_aer(); | |
b55438fd YL |
3775 | } else if (!strncmp(str, "realloc=", 8)) { |
3776 | pci_realloc_get_opt(str + 8); | |
f483d392 | 3777 | } else if (!strncmp(str, "realloc", 7)) { |
b55438fd | 3778 | pci_realloc_get_opt("on"); |
32a2eea7 JG |
3779 | } else if (!strcmp(str, "nodomains")) { |
3780 | pci_no_domains(); | |
4516a618 AN |
3781 | } else if (!strncmp(str, "cbiosize=", 9)) { |
3782 | pci_cardbus_io_size = memparse(str + 9, &str); | |
3783 | } else if (!strncmp(str, "cbmemsize=", 10)) { | |
3784 | pci_cardbus_mem_size = memparse(str + 10, &str); | |
32a9a682 YS |
3785 | } else if (!strncmp(str, "resource_alignment=", 19)) { |
3786 | pci_set_resource_alignment_param(str + 19, | |
3787 | strlen(str + 19)); | |
43c16408 AP |
3788 | } else if (!strncmp(str, "ecrc=", 5)) { |
3789 | pcie_ecrc_get_policy(str + 5); | |
28760489 EB |
3790 | } else if (!strncmp(str, "hpiosize=", 9)) { |
3791 | pci_hotplug_io_size = memparse(str + 9, &str); | |
3792 | } else if (!strncmp(str, "hpmemsize=", 10)) { | |
3793 | pci_hotplug_mem_size = memparse(str + 10, &str); | |
5f39e670 JM |
3794 | } else if (!strncmp(str, "pcie_bus_tune_off", 17)) { |
3795 | pcie_bus_config = PCIE_BUS_TUNE_OFF; | |
b03e7495 JM |
3796 | } else if (!strncmp(str, "pcie_bus_safe", 13)) { |
3797 | pcie_bus_config = PCIE_BUS_SAFE; | |
3798 | } else if (!strncmp(str, "pcie_bus_perf", 13)) { | |
3799 | pcie_bus_config = PCIE_BUS_PERFORMANCE; | |
5f39e670 JM |
3800 | } else if (!strncmp(str, "pcie_bus_peer2peer", 18)) { |
3801 | pcie_bus_config = PCIE_BUS_PEER2PEER; | |
309e57df MW |
3802 | } else { |
3803 | printk(KERN_ERR "PCI: Unknown option `%s'\n", | |
3804 | str); | |
3805 | } | |
1da177e4 LT |
3806 | } |
3807 | str = k; | |
3808 | } | |
0637a70a | 3809 | return 0; |
1da177e4 | 3810 | } |
0637a70a | 3811 | early_param("pci", pci_setup); |
1da177e4 | 3812 | |
0b62e13b | 3813 | EXPORT_SYMBOL(pci_reenable_device); |
b718989d BH |
3814 | EXPORT_SYMBOL(pci_enable_device_io); |
3815 | EXPORT_SYMBOL(pci_enable_device_mem); | |
1da177e4 | 3816 | EXPORT_SYMBOL(pci_enable_device); |
9ac7849e TH |
3817 | EXPORT_SYMBOL(pcim_enable_device); |
3818 | EXPORT_SYMBOL(pcim_pin_device); | |
1da177e4 | 3819 | EXPORT_SYMBOL(pci_disable_device); |
1da177e4 LT |
3820 | EXPORT_SYMBOL(pci_find_capability); |
3821 | EXPORT_SYMBOL(pci_bus_find_capability); | |
3822 | EXPORT_SYMBOL(pci_release_regions); | |
3823 | EXPORT_SYMBOL(pci_request_regions); | |
e8de1481 | 3824 | EXPORT_SYMBOL(pci_request_regions_exclusive); |
1da177e4 LT |
3825 | EXPORT_SYMBOL(pci_release_region); |
3826 | EXPORT_SYMBOL(pci_request_region); | |
e8de1481 | 3827 | EXPORT_SYMBOL(pci_request_region_exclusive); |
c87deff7 HS |
3828 | EXPORT_SYMBOL(pci_release_selected_regions); |
3829 | EXPORT_SYMBOL(pci_request_selected_regions); | |
e8de1481 | 3830 | EXPORT_SYMBOL(pci_request_selected_regions_exclusive); |
1da177e4 | 3831 | EXPORT_SYMBOL(pci_set_master); |
6a479079 | 3832 | EXPORT_SYMBOL(pci_clear_master); |
1da177e4 | 3833 | EXPORT_SYMBOL(pci_set_mwi); |
694625c0 | 3834 | EXPORT_SYMBOL(pci_try_set_mwi); |
1da177e4 | 3835 | EXPORT_SYMBOL(pci_clear_mwi); |
a04ce0ff | 3836 | EXPORT_SYMBOL_GPL(pci_intx); |
1da177e4 LT |
3837 | EXPORT_SYMBOL(pci_assign_resource); |
3838 | EXPORT_SYMBOL(pci_find_parent_resource); | |
c87deff7 | 3839 | EXPORT_SYMBOL(pci_select_bars); |
1da177e4 LT |
3840 | |
3841 | EXPORT_SYMBOL(pci_set_power_state); | |
3842 | EXPORT_SYMBOL(pci_save_state); | |
3843 | EXPORT_SYMBOL(pci_restore_state); | |
e5899e1b | 3844 | EXPORT_SYMBOL(pci_pme_capable); |
5a6c9b60 | 3845 | EXPORT_SYMBOL(pci_pme_active); |
0235c4fc | 3846 | EXPORT_SYMBOL(pci_wake_from_d3); |
e5899e1b | 3847 | EXPORT_SYMBOL(pci_target_state); |
404cc2d8 RW |
3848 | EXPORT_SYMBOL(pci_prepare_to_sleep); |
3849 | EXPORT_SYMBOL(pci_back_from_sleep); | |
f7bdd12d | 3850 | EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state); |