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Commit | Line | Data |
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94e61088 | 1 | #include <linux/delay.h> |
1da177e4 LT |
2 | #include <linux/pci.h> |
3 | #include <linux/module.h> | |
f6a57033 | 4 | #include <linux/sched.h> |
5a0e3ad6 | 5 | #include <linux/slab.h> |
1da177e4 | 6 | #include <linux/ioport.h> |
7ea7e98f | 7 | #include <linux/wait.h> |
1da177e4 | 8 | |
48b19148 AB |
9 | #include "pci.h" |
10 | ||
1da177e4 LT |
11 | /* |
12 | * This interrupt-safe spinlock protects all accesses to PCI | |
13 | * configuration space. | |
14 | */ | |
15 | ||
a2e27787 | 16 | DEFINE_RAW_SPINLOCK(pci_lock); |
1da177e4 LT |
17 | |
18 | /* | |
19 | * Wrappers for all PCI configuration access functions. They just check | |
20 | * alignment, do locking and call the low-level functions pointed to | |
21 | * by pci_dev->ops. | |
22 | */ | |
23 | ||
24 | #define PCI_byte_BAD 0 | |
25 | #define PCI_word_BAD (pos & 1) | |
26 | #define PCI_dword_BAD (pos & 3) | |
27 | ||
28 | #define PCI_OP_READ(size,type,len) \ | |
29 | int pci_bus_read_config_##size \ | |
30 | (struct pci_bus *bus, unsigned int devfn, int pos, type *value) \ | |
31 | { \ | |
32 | int res; \ | |
33 | unsigned long flags; \ | |
34 | u32 data = 0; \ | |
35 | if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ | |
511dd98c | 36 | raw_spin_lock_irqsave(&pci_lock, flags); \ |
1da177e4 LT |
37 | res = bus->ops->read(bus, devfn, pos, len, &data); \ |
38 | *value = (type)data; \ | |
511dd98c | 39 | raw_spin_unlock_irqrestore(&pci_lock, flags); \ |
1da177e4 LT |
40 | return res; \ |
41 | } | |
42 | ||
43 | #define PCI_OP_WRITE(size,type,len) \ | |
44 | int pci_bus_write_config_##size \ | |
45 | (struct pci_bus *bus, unsigned int devfn, int pos, type value) \ | |
46 | { \ | |
47 | int res; \ | |
48 | unsigned long flags; \ | |
49 | if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \ | |
511dd98c | 50 | raw_spin_lock_irqsave(&pci_lock, flags); \ |
1da177e4 | 51 | res = bus->ops->write(bus, devfn, pos, len, value); \ |
511dd98c | 52 | raw_spin_unlock_irqrestore(&pci_lock, flags); \ |
1da177e4 LT |
53 | return res; \ |
54 | } | |
55 | ||
56 | PCI_OP_READ(byte, u8, 1) | |
57 | PCI_OP_READ(word, u16, 2) | |
58 | PCI_OP_READ(dword, u32, 4) | |
59 | PCI_OP_WRITE(byte, u8, 1) | |
60 | PCI_OP_WRITE(word, u16, 2) | |
61 | PCI_OP_WRITE(dword, u32, 4) | |
62 | ||
63 | EXPORT_SYMBOL(pci_bus_read_config_byte); | |
64 | EXPORT_SYMBOL(pci_bus_read_config_word); | |
65 | EXPORT_SYMBOL(pci_bus_read_config_dword); | |
66 | EXPORT_SYMBOL(pci_bus_write_config_byte); | |
67 | EXPORT_SYMBOL(pci_bus_write_config_word); | |
68 | EXPORT_SYMBOL(pci_bus_write_config_dword); | |
e04b0ea2 | 69 | |
a72b46c3 HY |
70 | /** |
71 | * pci_bus_set_ops - Set raw operations of pci bus | |
72 | * @bus: pci bus struct | |
73 | * @ops: new raw operations | |
74 | * | |
75 | * Return previous raw operations | |
76 | */ | |
77 | struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops) | |
78 | { | |
79 | struct pci_ops *old_ops; | |
80 | unsigned long flags; | |
81 | ||
511dd98c | 82 | raw_spin_lock_irqsave(&pci_lock, flags); |
a72b46c3 HY |
83 | old_ops = bus->ops; |
84 | bus->ops = ops; | |
511dd98c | 85 | raw_spin_unlock_irqrestore(&pci_lock, flags); |
a72b46c3 HY |
86 | return old_ops; |
87 | } | |
88 | EXPORT_SYMBOL(pci_bus_set_ops); | |
287d19ce SH |
89 | |
90 | /** | |
91 | * pci_read_vpd - Read one entry from Vital Product Data | |
92 | * @dev: pci device struct | |
93 | * @pos: offset in vpd space | |
94 | * @count: number of bytes to read | |
95 | * @buf: pointer to where to store result | |
96 | * | |
97 | */ | |
98 | ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf) | |
99 | { | |
100 | if (!dev->vpd || !dev->vpd->ops) | |
101 | return -ENODEV; | |
102 | return dev->vpd->ops->read(dev, pos, count, buf); | |
103 | } | |
104 | EXPORT_SYMBOL(pci_read_vpd); | |
105 | ||
106 | /** | |
107 | * pci_write_vpd - Write entry to Vital Product Data | |
108 | * @dev: pci device struct | |
109 | * @pos: offset in vpd space | |
cffb2faf RD |
110 | * @count: number of bytes to write |
111 | * @buf: buffer containing write data | |
287d19ce SH |
112 | * |
113 | */ | |
114 | ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf) | |
115 | { | |
116 | if (!dev->vpd || !dev->vpd->ops) | |
117 | return -ENODEV; | |
118 | return dev->vpd->ops->write(dev, pos, count, buf); | |
119 | } | |
120 | EXPORT_SYMBOL(pci_write_vpd); | |
121 | ||
7ea7e98f MW |
122 | /* |
123 | * The following routines are to prevent the user from accessing PCI config | |
124 | * space when it's unsafe to do so. Some devices require this during BIST and | |
125 | * we're required to prevent it during D-state transitions. | |
126 | * | |
127 | * We have a bit per device to indicate it's blocked and a global wait queue | |
128 | * for callers to sleep on until devices are unblocked. | |
129 | */ | |
fb51ccbf | 130 | static DECLARE_WAIT_QUEUE_HEAD(pci_cfg_wait); |
e04b0ea2 | 131 | |
fb51ccbf | 132 | static noinline void pci_wait_cfg(struct pci_dev *dev) |
7ea7e98f MW |
133 | { |
134 | DECLARE_WAITQUEUE(wait, current); | |
135 | ||
fb51ccbf | 136 | __add_wait_queue(&pci_cfg_wait, &wait); |
7ea7e98f MW |
137 | do { |
138 | set_current_state(TASK_UNINTERRUPTIBLE); | |
511dd98c | 139 | raw_spin_unlock_irq(&pci_lock); |
7ea7e98f | 140 | schedule(); |
511dd98c | 141 | raw_spin_lock_irq(&pci_lock); |
fb51ccbf JK |
142 | } while (dev->block_cfg_access); |
143 | __remove_wait_queue(&pci_cfg_wait, &wait); | |
e04b0ea2 BK |
144 | } |
145 | ||
34e32072 | 146 | /* Returns 0 on success, negative values indicate error. */ |
e04b0ea2 BK |
147 | #define PCI_USER_READ_CONFIG(size,type) \ |
148 | int pci_user_read_config_##size \ | |
149 | (struct pci_dev *dev, int pos, type *val) \ | |
150 | { \ | |
e04b0ea2 BK |
151 | int ret = 0; \ |
152 | u32 data = -1; \ | |
34e32072 GT |
153 | if (PCI_##size##_BAD) \ |
154 | return -EINVAL; \ | |
511dd98c | 155 | raw_spin_lock_irq(&pci_lock); \ |
fb51ccbf JK |
156 | if (unlikely(dev->block_cfg_access)) \ |
157 | pci_wait_cfg(dev); \ | |
7ea7e98f | 158 | ret = dev->bus->ops->read(dev->bus, dev->devfn, \ |
e04b0ea2 | 159 | pos, sizeof(type), &data); \ |
511dd98c | 160 | raw_spin_unlock_irq(&pci_lock); \ |
e04b0ea2 | 161 | *val = (type)data; \ |
34e32072 GT |
162 | if (ret > 0) \ |
163 | ret = -EINVAL; \ | |
e04b0ea2 | 164 | return ret; \ |
c63587d7 AW |
165 | } \ |
166 | EXPORT_SYMBOL_GPL(pci_user_read_config_##size); | |
e04b0ea2 | 167 | |
34e32072 | 168 | /* Returns 0 on success, negative values indicate error. */ |
e04b0ea2 BK |
169 | #define PCI_USER_WRITE_CONFIG(size,type) \ |
170 | int pci_user_write_config_##size \ | |
171 | (struct pci_dev *dev, int pos, type val) \ | |
172 | { \ | |
e04b0ea2 | 173 | int ret = -EIO; \ |
34e32072 GT |
174 | if (PCI_##size##_BAD) \ |
175 | return -EINVAL; \ | |
511dd98c | 176 | raw_spin_lock_irq(&pci_lock); \ |
fb51ccbf JK |
177 | if (unlikely(dev->block_cfg_access)) \ |
178 | pci_wait_cfg(dev); \ | |
7ea7e98f | 179 | ret = dev->bus->ops->write(dev->bus, dev->devfn, \ |
e04b0ea2 | 180 | pos, sizeof(type), val); \ |
511dd98c | 181 | raw_spin_unlock_irq(&pci_lock); \ |
34e32072 GT |
182 | if (ret > 0) \ |
183 | ret = -EINVAL; \ | |
e04b0ea2 | 184 | return ret; \ |
c63587d7 AW |
185 | } \ |
186 | EXPORT_SYMBOL_GPL(pci_user_write_config_##size); | |
e04b0ea2 BK |
187 | |
188 | PCI_USER_READ_CONFIG(byte, u8) | |
189 | PCI_USER_READ_CONFIG(word, u16) | |
190 | PCI_USER_READ_CONFIG(dword, u32) | |
191 | PCI_USER_WRITE_CONFIG(byte, u8) | |
192 | PCI_USER_WRITE_CONFIG(word, u16) | |
193 | PCI_USER_WRITE_CONFIG(dword, u32) | |
194 | ||
94e61088 BH |
195 | /* VPD access through PCI 2.2+ VPD capability */ |
196 | ||
197 | #define PCI_VPD_PCI22_SIZE (PCI_VPD_ADDR_MASK + 1) | |
198 | ||
199 | struct pci_vpd_pci22 { | |
200 | struct pci_vpd base; | |
1120f8b8 SH |
201 | struct mutex lock; |
202 | u16 flag; | |
94e61088 | 203 | bool busy; |
1120f8b8 | 204 | u8 cap; |
94e61088 BH |
205 | }; |
206 | ||
1120f8b8 SH |
207 | /* |
208 | * Wait for last operation to complete. | |
209 | * This code has to spin since there is no other notification from the PCI | |
210 | * hardware. Since the VPD is often implemented by serial attachment to an | |
211 | * EEPROM, it may take many milliseconds to complete. | |
34e32072 GT |
212 | * |
213 | * Returns 0 on success, negative values indicate error. | |
1120f8b8 | 214 | */ |
94e61088 BH |
215 | static int pci_vpd_pci22_wait(struct pci_dev *dev) |
216 | { | |
217 | struct pci_vpd_pci22 *vpd = | |
218 | container_of(dev->vpd, struct pci_vpd_pci22, base); | |
1120f8b8 SH |
219 | unsigned long timeout = jiffies + HZ/20 + 2; |
220 | u16 status; | |
94e61088 BH |
221 | int ret; |
222 | ||
223 | if (!vpd->busy) | |
224 | return 0; | |
225 | ||
94e61088 | 226 | for (;;) { |
1120f8b8 | 227 | ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR, |
94e61088 | 228 | &status); |
34e32072 | 229 | if (ret < 0) |
94e61088 | 230 | return ret; |
1120f8b8 SH |
231 | |
232 | if ((status & PCI_VPD_ADDR_F) == vpd->flag) { | |
94e61088 BH |
233 | vpd->busy = false; |
234 | return 0; | |
235 | } | |
1120f8b8 | 236 | |
5030718e PB |
237 | if (time_after(jiffies, timeout)) { |
238 | dev_printk(KERN_DEBUG, &dev->dev, | |
239 | "vpd r/w failed. This is likely a firmware " | |
240 | "bug on this device. Contact the card " | |
241 | "vendor for a firmware update."); | |
94e61088 | 242 | return -ETIMEDOUT; |
5030718e | 243 | } |
1120f8b8 SH |
244 | if (fatal_signal_pending(current)) |
245 | return -EINTR; | |
246 | if (!cond_resched()) | |
247 | udelay(10); | |
94e61088 BH |
248 | } |
249 | } | |
250 | ||
287d19ce SH |
251 | static ssize_t pci_vpd_pci22_read(struct pci_dev *dev, loff_t pos, size_t count, |
252 | void *arg) | |
94e61088 BH |
253 | { |
254 | struct pci_vpd_pci22 *vpd = | |
255 | container_of(dev->vpd, struct pci_vpd_pci22, base); | |
287d19ce SH |
256 | int ret; |
257 | loff_t end = pos + count; | |
258 | u8 *buf = arg; | |
94e61088 | 259 | |
287d19ce | 260 | if (pos < 0 || pos > vpd->base.len || end > vpd->base.len) |
94e61088 | 261 | return -EINVAL; |
94e61088 | 262 | |
1120f8b8 SH |
263 | if (mutex_lock_killable(&vpd->lock)) |
264 | return -EINTR; | |
265 | ||
94e61088 BH |
266 | ret = pci_vpd_pci22_wait(dev); |
267 | if (ret < 0) | |
268 | goto out; | |
1120f8b8 | 269 | |
287d19ce SH |
270 | while (pos < end) { |
271 | u32 val; | |
272 | unsigned int i, skip; | |
273 | ||
274 | ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR, | |
275 | pos & ~3); | |
276 | if (ret < 0) | |
277 | break; | |
278 | vpd->busy = true; | |
279 | vpd->flag = PCI_VPD_ADDR_F; | |
280 | ret = pci_vpd_pci22_wait(dev); | |
281 | if (ret < 0) | |
282 | break; | |
283 | ||
284 | ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val); | |
285 | if (ret < 0) | |
286 | break; | |
287 | ||
288 | skip = pos & 3; | |
289 | for (i = 0; i < sizeof(u32); i++) { | |
290 | if (i >= skip) { | |
291 | *buf++ = val; | |
292 | if (++pos == end) | |
293 | break; | |
294 | } | |
295 | val >>= 8; | |
296 | } | |
297 | } | |
94e61088 | 298 | out: |
1120f8b8 | 299 | mutex_unlock(&vpd->lock); |
287d19ce | 300 | return ret ? ret : count; |
94e61088 BH |
301 | } |
302 | ||
287d19ce SH |
303 | static ssize_t pci_vpd_pci22_write(struct pci_dev *dev, loff_t pos, size_t count, |
304 | const void *arg) | |
94e61088 BH |
305 | { |
306 | struct pci_vpd_pci22 *vpd = | |
307 | container_of(dev->vpd, struct pci_vpd_pci22, base); | |
287d19ce SH |
308 | const u8 *buf = arg; |
309 | loff_t end = pos + count; | |
1120f8b8 | 310 | int ret = 0; |
94e61088 | 311 | |
287d19ce | 312 | if (pos < 0 || (pos & 3) || (count & 3) || end > vpd->base.len) |
94e61088 BH |
313 | return -EINVAL; |
314 | ||
1120f8b8 SH |
315 | if (mutex_lock_killable(&vpd->lock)) |
316 | return -EINTR; | |
287d19ce | 317 | |
94e61088 BH |
318 | ret = pci_vpd_pci22_wait(dev); |
319 | if (ret < 0) | |
320 | goto out; | |
287d19ce SH |
321 | |
322 | while (pos < end) { | |
323 | u32 val; | |
324 | ||
325 | val = *buf++; | |
326 | val |= *buf++ << 8; | |
327 | val |= *buf++ << 16; | |
328 | val |= *buf++ << 24; | |
329 | ||
330 | ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, val); | |
331 | if (ret < 0) | |
332 | break; | |
333 | ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR, | |
334 | pos | PCI_VPD_ADDR_F); | |
335 | if (ret < 0) | |
336 | break; | |
337 | ||
338 | vpd->busy = true; | |
339 | vpd->flag = 0; | |
340 | ret = pci_vpd_pci22_wait(dev); | |
d97ecd81 GT |
341 | if (ret < 0) |
342 | break; | |
287d19ce SH |
343 | |
344 | pos += sizeof(u32); | |
345 | } | |
94e61088 | 346 | out: |
1120f8b8 | 347 | mutex_unlock(&vpd->lock); |
287d19ce | 348 | return ret ? ret : count; |
94e61088 BH |
349 | } |
350 | ||
94e61088 BH |
351 | static void pci_vpd_pci22_release(struct pci_dev *dev) |
352 | { | |
353 | kfree(container_of(dev->vpd, struct pci_vpd_pci22, base)); | |
354 | } | |
355 | ||
287d19ce | 356 | static const struct pci_vpd_ops pci_vpd_pci22_ops = { |
94e61088 BH |
357 | .read = pci_vpd_pci22_read, |
358 | .write = pci_vpd_pci22_write, | |
94e61088 BH |
359 | .release = pci_vpd_pci22_release, |
360 | }; | |
361 | ||
362 | int pci_vpd_pci22_init(struct pci_dev *dev) | |
363 | { | |
364 | struct pci_vpd_pci22 *vpd; | |
365 | u8 cap; | |
366 | ||
367 | cap = pci_find_capability(dev, PCI_CAP_ID_VPD); | |
368 | if (!cap) | |
369 | return -ENODEV; | |
370 | vpd = kzalloc(sizeof(*vpd), GFP_ATOMIC); | |
371 | if (!vpd) | |
372 | return -ENOMEM; | |
373 | ||
99cb233d | 374 | vpd->base.len = PCI_VPD_PCI22_SIZE; |
94e61088 | 375 | vpd->base.ops = &pci_vpd_pci22_ops; |
1120f8b8 | 376 | mutex_init(&vpd->lock); |
94e61088 BH |
377 | vpd->cap = cap; |
378 | vpd->busy = false; | |
379 | dev->vpd = &vpd->base; | |
380 | return 0; | |
381 | } | |
382 | ||
db567943 SH |
383 | /** |
384 | * pci_vpd_truncate - Set available Vital Product Data size | |
385 | * @dev: pci device struct | |
386 | * @size: available memory in bytes | |
387 | * | |
388 | * Adjust size of available VPD area. | |
389 | */ | |
390 | int pci_vpd_truncate(struct pci_dev *dev, size_t size) | |
391 | { | |
392 | if (!dev->vpd) | |
393 | return -EINVAL; | |
394 | ||
395 | /* limited by the access method */ | |
396 | if (size > dev->vpd->len) | |
397 | return -EINVAL; | |
398 | ||
399 | dev->vpd->len = size; | |
d407e32e AV |
400 | if (dev->vpd->attr) |
401 | dev->vpd->attr->size = size; | |
db567943 SH |
402 | |
403 | return 0; | |
404 | } | |
405 | EXPORT_SYMBOL(pci_vpd_truncate); | |
406 | ||
e04b0ea2 | 407 | /** |
fb51ccbf | 408 | * pci_cfg_access_lock - Lock PCI config reads/writes |
e04b0ea2 BK |
409 | * @dev: pci device struct |
410 | * | |
fb51ccbf JK |
411 | * When access is locked, any userspace reads or writes to config |
412 | * space and concurrent lock requests will sleep until access is | |
413 | * allowed via pci_cfg_access_unlocked again. | |
7ea7e98f | 414 | */ |
fb51ccbf JK |
415 | void pci_cfg_access_lock(struct pci_dev *dev) |
416 | { | |
417 | might_sleep(); | |
418 | ||
419 | raw_spin_lock_irq(&pci_lock); | |
420 | if (dev->block_cfg_access) | |
421 | pci_wait_cfg(dev); | |
422 | dev->block_cfg_access = 1; | |
423 | raw_spin_unlock_irq(&pci_lock); | |
424 | } | |
425 | EXPORT_SYMBOL_GPL(pci_cfg_access_lock); | |
426 | ||
427 | /** | |
428 | * pci_cfg_access_trylock - try to lock PCI config reads/writes | |
429 | * @dev: pci device struct | |
430 | * | |
431 | * Same as pci_cfg_access_lock, but will return 0 if access is | |
432 | * already locked, 1 otherwise. This function can be used from | |
433 | * atomic contexts. | |
434 | */ | |
435 | bool pci_cfg_access_trylock(struct pci_dev *dev) | |
e04b0ea2 BK |
436 | { |
437 | unsigned long flags; | |
fb51ccbf | 438 | bool locked = true; |
e04b0ea2 | 439 | |
511dd98c | 440 | raw_spin_lock_irqsave(&pci_lock, flags); |
fb51ccbf JK |
441 | if (dev->block_cfg_access) |
442 | locked = false; | |
443 | else | |
444 | dev->block_cfg_access = 1; | |
511dd98c | 445 | raw_spin_unlock_irqrestore(&pci_lock, flags); |
7ea7e98f | 446 | |
fb51ccbf | 447 | return locked; |
e04b0ea2 | 448 | } |
fb51ccbf | 449 | EXPORT_SYMBOL_GPL(pci_cfg_access_trylock); |
e04b0ea2 BK |
450 | |
451 | /** | |
fb51ccbf | 452 | * pci_cfg_access_unlock - Unlock PCI config reads/writes |
e04b0ea2 BK |
453 | * @dev: pci device struct |
454 | * | |
fb51ccbf | 455 | * This function allows PCI config accesses to resume. |
7ea7e98f | 456 | */ |
fb51ccbf | 457 | void pci_cfg_access_unlock(struct pci_dev *dev) |
e04b0ea2 BK |
458 | { |
459 | unsigned long flags; | |
460 | ||
511dd98c | 461 | raw_spin_lock_irqsave(&pci_lock, flags); |
7ea7e98f MW |
462 | |
463 | /* This indicates a problem in the caller, but we don't need | |
464 | * to kill them, unlike a double-block above. */ | |
fb51ccbf | 465 | WARN_ON(!dev->block_cfg_access); |
7ea7e98f | 466 | |
fb51ccbf JK |
467 | dev->block_cfg_access = 0; |
468 | wake_up_all(&pci_cfg_wait); | |
511dd98c | 469 | raw_spin_unlock_irqrestore(&pci_lock, flags); |
e04b0ea2 | 470 | } |
fb51ccbf | 471 | EXPORT_SYMBOL_GPL(pci_cfg_access_unlock); |
8c0d3a02 JL |
472 | |
473 | static inline int pcie_cap_version(const struct pci_dev *dev) | |
474 | { | |
1c531d82 | 475 | return pcie_caps_reg(dev) & PCI_EXP_FLAGS_VERS; |
8c0d3a02 JL |
476 | } |
477 | ||
8c0d3a02 JL |
478 | static inline bool pcie_cap_has_lnkctl(const struct pci_dev *dev) |
479 | { | |
480 | int type = pci_pcie_type(dev); | |
481 | ||
c8b303d0 | 482 | return type == PCI_EXP_TYPE_ENDPOINT || |
d3694d4f BH |
483 | type == PCI_EXP_TYPE_LEG_END || |
484 | type == PCI_EXP_TYPE_ROOT_PORT || | |
485 | type == PCI_EXP_TYPE_UPSTREAM || | |
486 | type == PCI_EXP_TYPE_DOWNSTREAM || | |
487 | type == PCI_EXP_TYPE_PCI_BRIDGE || | |
488 | type == PCI_EXP_TYPE_PCIE_BRIDGE; | |
8c0d3a02 JL |
489 | } |
490 | ||
491 | static inline bool pcie_cap_has_sltctl(const struct pci_dev *dev) | |
492 | { | |
493 | int type = pci_pcie_type(dev); | |
494 | ||
6d3a1741 BH |
495 | return (type == PCI_EXP_TYPE_ROOT_PORT || |
496 | type == PCI_EXP_TYPE_DOWNSTREAM) && | |
497 | pcie_caps_reg(dev) & PCI_EXP_FLAGS_SLOT; | |
8c0d3a02 JL |
498 | } |
499 | ||
500 | static inline bool pcie_cap_has_rtctl(const struct pci_dev *dev) | |
501 | { | |
502 | int type = pci_pcie_type(dev); | |
503 | ||
c8b303d0 | 504 | return type == PCI_EXP_TYPE_ROOT_PORT || |
8c0d3a02 JL |
505 | type == PCI_EXP_TYPE_RC_EC; |
506 | } | |
507 | ||
508 | static bool pcie_capability_reg_implemented(struct pci_dev *dev, int pos) | |
509 | { | |
510 | if (!pci_is_pcie(dev)) | |
511 | return false; | |
512 | ||
513 | switch (pos) { | |
969daa34 | 514 | case PCI_EXP_FLAGS: |
8c0d3a02 JL |
515 | return true; |
516 | case PCI_EXP_DEVCAP: | |
517 | case PCI_EXP_DEVCTL: | |
518 | case PCI_EXP_DEVSTA: | |
fed24515 | 519 | return true; |
8c0d3a02 JL |
520 | case PCI_EXP_LNKCAP: |
521 | case PCI_EXP_LNKCTL: | |
522 | case PCI_EXP_LNKSTA: | |
523 | return pcie_cap_has_lnkctl(dev); | |
524 | case PCI_EXP_SLTCAP: | |
525 | case PCI_EXP_SLTCTL: | |
526 | case PCI_EXP_SLTSTA: | |
527 | return pcie_cap_has_sltctl(dev); | |
528 | case PCI_EXP_RTCTL: | |
529 | case PCI_EXP_RTCAP: | |
530 | case PCI_EXP_RTSTA: | |
531 | return pcie_cap_has_rtctl(dev); | |
532 | case PCI_EXP_DEVCAP2: | |
533 | case PCI_EXP_DEVCTL2: | |
534 | case PCI_EXP_LNKCAP2: | |
535 | case PCI_EXP_LNKCTL2: | |
536 | case PCI_EXP_LNKSTA2: | |
537 | return pcie_cap_version(dev) > 1; | |
538 | default: | |
539 | return false; | |
540 | } | |
541 | } | |
542 | ||
543 | /* | |
544 | * Note that these accessor functions are only for the "PCI Express | |
545 | * Capability" (see PCIe spec r3.0, sec 7.8). They do not apply to the | |
546 | * other "PCI Express Extended Capabilities" (AER, VC, ACS, MFVC, etc.) | |
547 | */ | |
548 | int pcie_capability_read_word(struct pci_dev *dev, int pos, u16 *val) | |
549 | { | |
550 | int ret; | |
551 | ||
552 | *val = 0; | |
553 | if (pos & 1) | |
554 | return -EINVAL; | |
555 | ||
556 | if (pcie_capability_reg_implemented(dev, pos)) { | |
557 | ret = pci_read_config_word(dev, pci_pcie_cap(dev) + pos, val); | |
558 | /* | |
559 | * Reset *val to 0 if pci_read_config_word() fails, it may | |
560 | * have been written as 0xFFFF if hardware error happens | |
561 | * during pci_read_config_word(). | |
562 | */ | |
563 | if (ret) | |
564 | *val = 0; | |
565 | return ret; | |
566 | } | |
567 | ||
568 | /* | |
569 | * For Functions that do not implement the Slot Capabilities, | |
570 | * Slot Status, and Slot Control registers, these spaces must | |
571 | * be hardwired to 0b, with the exception of the Presence Detect | |
572 | * State bit in the Slot Status register of Downstream Ports, | |
573 | * which must be hardwired to 1b. (PCIe Base Spec 3.0, sec 7.8) | |
574 | */ | |
575 | if (pci_is_pcie(dev) && pos == PCI_EXP_SLTSTA && | |
576 | pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM) { | |
577 | *val = PCI_EXP_SLTSTA_PDS; | |
578 | } | |
579 | ||
580 | return 0; | |
581 | } | |
582 | EXPORT_SYMBOL(pcie_capability_read_word); | |
583 | ||
584 | int pcie_capability_read_dword(struct pci_dev *dev, int pos, u32 *val) | |
585 | { | |
586 | int ret; | |
587 | ||
588 | *val = 0; | |
589 | if (pos & 3) | |
590 | return -EINVAL; | |
591 | ||
592 | if (pcie_capability_reg_implemented(dev, pos)) { | |
593 | ret = pci_read_config_dword(dev, pci_pcie_cap(dev) + pos, val); | |
594 | /* | |
595 | * Reset *val to 0 if pci_read_config_dword() fails, it may | |
596 | * have been written as 0xFFFFFFFF if hardware error happens | |
597 | * during pci_read_config_dword(). | |
598 | */ | |
599 | if (ret) | |
600 | *val = 0; | |
601 | return ret; | |
602 | } | |
603 | ||
604 | if (pci_is_pcie(dev) && pos == PCI_EXP_SLTCTL && | |
605 | pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM) { | |
606 | *val = PCI_EXP_SLTSTA_PDS; | |
607 | } | |
608 | ||
609 | return 0; | |
610 | } | |
611 | EXPORT_SYMBOL(pcie_capability_read_dword); | |
612 | ||
613 | int pcie_capability_write_word(struct pci_dev *dev, int pos, u16 val) | |
614 | { | |
615 | if (pos & 1) | |
616 | return -EINVAL; | |
617 | ||
618 | if (!pcie_capability_reg_implemented(dev, pos)) | |
619 | return 0; | |
620 | ||
621 | return pci_write_config_word(dev, pci_pcie_cap(dev) + pos, val); | |
622 | } | |
623 | EXPORT_SYMBOL(pcie_capability_write_word); | |
624 | ||
625 | int pcie_capability_write_dword(struct pci_dev *dev, int pos, u32 val) | |
626 | { | |
627 | if (pos & 3) | |
628 | return -EINVAL; | |
629 | ||
630 | if (!pcie_capability_reg_implemented(dev, pos)) | |
631 | return 0; | |
632 | ||
633 | return pci_write_config_dword(dev, pci_pcie_cap(dev) + pos, val); | |
634 | } | |
635 | EXPORT_SYMBOL(pcie_capability_write_dword); | |
636 | ||
637 | int pcie_capability_clear_and_set_word(struct pci_dev *dev, int pos, | |
638 | u16 clear, u16 set) | |
639 | { | |
640 | int ret; | |
641 | u16 val; | |
642 | ||
643 | ret = pcie_capability_read_word(dev, pos, &val); | |
644 | if (!ret) { | |
645 | val &= ~clear; | |
646 | val |= set; | |
647 | ret = pcie_capability_write_word(dev, pos, val); | |
648 | } | |
649 | ||
650 | return ret; | |
651 | } | |
652 | EXPORT_SYMBOL(pcie_capability_clear_and_set_word); | |
653 | ||
654 | int pcie_capability_clear_and_set_dword(struct pci_dev *dev, int pos, | |
655 | u32 clear, u32 set) | |
656 | { | |
657 | int ret; | |
658 | u32 val; | |
659 | ||
660 | ret = pcie_capability_read_dword(dev, pos, &val); | |
661 | if (!ret) { | |
662 | val &= ~clear; | |
663 | val |= set; | |
664 | ret = pcie_capability_write_dword(dev, pos, val); | |
665 | } | |
666 | ||
667 | return ret; | |
668 | } | |
669 | EXPORT_SYMBOL(pcie_capability_clear_and_set_dword); |