Commit | Line | Data |
---|---|---|
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 | ||
ff3ce480 | 28 | #define PCI_OP_READ(size, type, len) \ |
1da177e4 LT |
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 | ||
ff3ce480 | 43 | #define PCI_OP_WRITE(size, type, len) \ |
1da177e4 LT |
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 | |
1f94a94f RH |
70 | int pci_generic_config_read(struct pci_bus *bus, unsigned int devfn, |
71 | int where, int size, u32 *val) | |
72 | { | |
73 | void __iomem *addr; | |
74 | ||
75 | addr = bus->ops->map_bus(bus, devfn, where); | |
76 | if (!addr) { | |
77 | *val = ~0; | |
78 | return PCIBIOS_DEVICE_NOT_FOUND; | |
79 | } | |
80 | ||
81 | if (size == 1) | |
82 | *val = readb(addr); | |
83 | else if (size == 2) | |
84 | *val = readw(addr); | |
85 | else | |
86 | *val = readl(addr); | |
87 | ||
88 | return PCIBIOS_SUCCESSFUL; | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(pci_generic_config_read); | |
91 | ||
92 | int pci_generic_config_write(struct pci_bus *bus, unsigned int devfn, | |
93 | int where, int size, u32 val) | |
94 | { | |
95 | void __iomem *addr; | |
96 | ||
97 | addr = bus->ops->map_bus(bus, devfn, where); | |
98 | if (!addr) | |
99 | return PCIBIOS_DEVICE_NOT_FOUND; | |
100 | ||
101 | if (size == 1) | |
102 | writeb(val, addr); | |
103 | else if (size == 2) | |
104 | writew(val, addr); | |
105 | else | |
106 | writel(val, addr); | |
107 | ||
108 | return PCIBIOS_SUCCESSFUL; | |
109 | } | |
110 | EXPORT_SYMBOL_GPL(pci_generic_config_write); | |
111 | ||
112 | int pci_generic_config_read32(struct pci_bus *bus, unsigned int devfn, | |
113 | int where, int size, u32 *val) | |
114 | { | |
115 | void __iomem *addr; | |
116 | ||
117 | addr = bus->ops->map_bus(bus, devfn, where & ~0x3); | |
118 | if (!addr) { | |
119 | *val = ~0; | |
120 | return PCIBIOS_DEVICE_NOT_FOUND; | |
121 | } | |
122 | ||
123 | *val = readl(addr); | |
124 | ||
125 | if (size <= 2) | |
126 | *val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1); | |
127 | ||
128 | return PCIBIOS_SUCCESSFUL; | |
129 | } | |
130 | EXPORT_SYMBOL_GPL(pci_generic_config_read32); | |
131 | ||
132 | int pci_generic_config_write32(struct pci_bus *bus, unsigned int devfn, | |
133 | int where, int size, u32 val) | |
134 | { | |
135 | void __iomem *addr; | |
136 | u32 mask, tmp; | |
137 | ||
138 | addr = bus->ops->map_bus(bus, devfn, where & ~0x3); | |
139 | if (!addr) | |
140 | return PCIBIOS_DEVICE_NOT_FOUND; | |
141 | ||
142 | if (size == 4) { | |
143 | writel(val, addr); | |
144 | return PCIBIOS_SUCCESSFUL; | |
145 | } else { | |
146 | mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8)); | |
147 | } | |
148 | ||
149 | tmp = readl(addr) & mask; | |
150 | tmp |= val << ((where & 0x3) * 8); | |
151 | writel(tmp, addr); | |
152 | ||
153 | return PCIBIOS_SUCCESSFUL; | |
154 | } | |
155 | EXPORT_SYMBOL_GPL(pci_generic_config_write32); | |
156 | ||
a72b46c3 HY |
157 | /** |
158 | * pci_bus_set_ops - Set raw operations of pci bus | |
159 | * @bus: pci bus struct | |
160 | * @ops: new raw operations | |
161 | * | |
162 | * Return previous raw operations | |
163 | */ | |
164 | struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops) | |
165 | { | |
166 | struct pci_ops *old_ops; | |
167 | unsigned long flags; | |
168 | ||
511dd98c | 169 | raw_spin_lock_irqsave(&pci_lock, flags); |
a72b46c3 HY |
170 | old_ops = bus->ops; |
171 | bus->ops = ops; | |
511dd98c | 172 | raw_spin_unlock_irqrestore(&pci_lock, flags); |
a72b46c3 HY |
173 | return old_ops; |
174 | } | |
175 | EXPORT_SYMBOL(pci_bus_set_ops); | |
287d19ce | 176 | |
7ea7e98f MW |
177 | /* |
178 | * The following routines are to prevent the user from accessing PCI config | |
179 | * space when it's unsafe to do so. Some devices require this during BIST and | |
180 | * we're required to prevent it during D-state transitions. | |
181 | * | |
182 | * We have a bit per device to indicate it's blocked and a global wait queue | |
183 | * for callers to sleep on until devices are unblocked. | |
184 | */ | |
fb51ccbf | 185 | static DECLARE_WAIT_QUEUE_HEAD(pci_cfg_wait); |
e04b0ea2 | 186 | |
fb51ccbf | 187 | static noinline void pci_wait_cfg(struct pci_dev *dev) |
7ea7e98f MW |
188 | { |
189 | DECLARE_WAITQUEUE(wait, current); | |
190 | ||
fb51ccbf | 191 | __add_wait_queue(&pci_cfg_wait, &wait); |
7ea7e98f MW |
192 | do { |
193 | set_current_state(TASK_UNINTERRUPTIBLE); | |
511dd98c | 194 | raw_spin_unlock_irq(&pci_lock); |
7ea7e98f | 195 | schedule(); |
511dd98c | 196 | raw_spin_lock_irq(&pci_lock); |
fb51ccbf JK |
197 | } while (dev->block_cfg_access); |
198 | __remove_wait_queue(&pci_cfg_wait, &wait); | |
e04b0ea2 BK |
199 | } |
200 | ||
34e32072 | 201 | /* Returns 0 on success, negative values indicate error. */ |
ff3ce480 | 202 | #define PCI_USER_READ_CONFIG(size, type) \ |
e04b0ea2 BK |
203 | int pci_user_read_config_##size \ |
204 | (struct pci_dev *dev, int pos, type *val) \ | |
205 | { \ | |
d97ffe23 | 206 | int ret = PCIBIOS_SUCCESSFUL; \ |
e04b0ea2 | 207 | u32 data = -1; \ |
34e32072 GT |
208 | if (PCI_##size##_BAD) \ |
209 | return -EINVAL; \ | |
511dd98c | 210 | raw_spin_lock_irq(&pci_lock); \ |
fb51ccbf JK |
211 | if (unlikely(dev->block_cfg_access)) \ |
212 | pci_wait_cfg(dev); \ | |
7ea7e98f | 213 | ret = dev->bus->ops->read(dev->bus, dev->devfn, \ |
e04b0ea2 | 214 | pos, sizeof(type), &data); \ |
511dd98c | 215 | raw_spin_unlock_irq(&pci_lock); \ |
e04b0ea2 | 216 | *val = (type)data; \ |
d97ffe23 | 217 | return pcibios_err_to_errno(ret); \ |
c63587d7 AW |
218 | } \ |
219 | EXPORT_SYMBOL_GPL(pci_user_read_config_##size); | |
e04b0ea2 | 220 | |
34e32072 | 221 | /* Returns 0 on success, negative values indicate error. */ |
ff3ce480 | 222 | #define PCI_USER_WRITE_CONFIG(size, type) \ |
e04b0ea2 BK |
223 | int pci_user_write_config_##size \ |
224 | (struct pci_dev *dev, int pos, type val) \ | |
225 | { \ | |
d97ffe23 | 226 | int ret = PCIBIOS_SUCCESSFUL; \ |
34e32072 GT |
227 | if (PCI_##size##_BAD) \ |
228 | return -EINVAL; \ | |
511dd98c | 229 | raw_spin_lock_irq(&pci_lock); \ |
fb51ccbf JK |
230 | if (unlikely(dev->block_cfg_access)) \ |
231 | pci_wait_cfg(dev); \ | |
7ea7e98f | 232 | ret = dev->bus->ops->write(dev->bus, dev->devfn, \ |
e04b0ea2 | 233 | pos, sizeof(type), val); \ |
511dd98c | 234 | raw_spin_unlock_irq(&pci_lock); \ |
d97ffe23 | 235 | return pcibios_err_to_errno(ret); \ |
c63587d7 AW |
236 | } \ |
237 | EXPORT_SYMBOL_GPL(pci_user_write_config_##size); | |
e04b0ea2 BK |
238 | |
239 | PCI_USER_READ_CONFIG(byte, u8) | |
240 | PCI_USER_READ_CONFIG(word, u16) | |
241 | PCI_USER_READ_CONFIG(dword, u32) | |
242 | PCI_USER_WRITE_CONFIG(byte, u8) | |
243 | PCI_USER_WRITE_CONFIG(word, u16) | |
244 | PCI_USER_WRITE_CONFIG(dword, u32) | |
245 | ||
94e61088 BH |
246 | /* VPD access through PCI 2.2+ VPD capability */ |
247 | ||
fc0a407e BH |
248 | /** |
249 | * pci_read_vpd - Read one entry from Vital Product Data | |
250 | * @dev: pci device struct | |
251 | * @pos: offset in vpd space | |
252 | * @count: number of bytes to read | |
253 | * @buf: pointer to where to store result | |
254 | */ | |
255 | ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf) | |
256 | { | |
257 | if (!dev->vpd || !dev->vpd->ops) | |
258 | return -ENODEV; | |
259 | return dev->vpd->ops->read(dev, pos, count, buf); | |
260 | } | |
261 | EXPORT_SYMBOL(pci_read_vpd); | |
262 | ||
263 | /** | |
264 | * pci_write_vpd - Write entry to Vital Product Data | |
265 | * @dev: pci device struct | |
266 | * @pos: offset in vpd space | |
267 | * @count: number of bytes to write | |
268 | * @buf: buffer containing write data | |
269 | */ | |
270 | ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf) | |
271 | { | |
272 | if (!dev->vpd || !dev->vpd->ops) | |
273 | return -ENODEV; | |
274 | return dev->vpd->ops->write(dev, pos, count, buf); | |
275 | } | |
276 | EXPORT_SYMBOL(pci_write_vpd); | |
277 | ||
cb92148b HS |
278 | /** |
279 | * pci_set_vpd_size - Set size of Vital Product Data space | |
280 | * @dev: pci device struct | |
281 | * @len: size of vpd space | |
282 | */ | |
283 | int pci_set_vpd_size(struct pci_dev *dev, size_t len) | |
284 | { | |
285 | if (!dev->vpd || !dev->vpd->ops) | |
286 | return -ENODEV; | |
287 | return dev->vpd->ops->set_size(dev, len); | |
288 | } | |
289 | EXPORT_SYMBOL(pci_set_vpd_size); | |
290 | ||
f1cd93f9 | 291 | #define PCI_VPD_MAX_SIZE (PCI_VPD_ADDR_MASK + 1) |
94e61088 | 292 | |
104daa71 HR |
293 | /** |
294 | * pci_vpd_size - determine actual size of Vital Product Data | |
295 | * @dev: pci device struct | |
296 | * @old_size: current assumed size, also maximum allowed size | |
297 | */ | |
f1cd93f9 | 298 | static size_t pci_vpd_size(struct pci_dev *dev, size_t old_size) |
104daa71 HR |
299 | { |
300 | size_t off = 0; | |
301 | unsigned char header[1+2]; /* 1 byte tag, 2 bytes length */ | |
302 | ||
303 | while (off < old_size && | |
304 | pci_read_vpd(dev, off, 1, header) == 1) { | |
305 | unsigned char tag; | |
306 | ||
307 | if (header[0] & PCI_VPD_LRDT) { | |
308 | /* Large Resource Data Type Tag */ | |
309 | tag = pci_vpd_lrdt_tag(header); | |
310 | /* Only read length from known tag items */ | |
311 | if ((tag == PCI_VPD_LTIN_ID_STRING) || | |
312 | (tag == PCI_VPD_LTIN_RO_DATA) || | |
313 | (tag == PCI_VPD_LTIN_RW_DATA)) { | |
314 | if (pci_read_vpd(dev, off+1, 2, | |
315 | &header[1]) != 2) { | |
316 | dev_warn(&dev->dev, | |
317 | "invalid large VPD tag %02x size at offset %zu", | |
318 | tag, off + 1); | |
319 | return 0; | |
320 | } | |
321 | off += PCI_VPD_LRDT_TAG_SIZE + | |
322 | pci_vpd_lrdt_size(header); | |
323 | } | |
324 | } else { | |
325 | /* Short Resource Data Type Tag */ | |
326 | off += PCI_VPD_SRDT_TAG_SIZE + | |
327 | pci_vpd_srdt_size(header); | |
328 | tag = pci_vpd_srdt_tag(header); | |
329 | } | |
330 | ||
331 | if (tag == PCI_VPD_STIN_END) /* End tag descriptor */ | |
332 | return off; | |
333 | ||
334 | if ((tag != PCI_VPD_LTIN_ID_STRING) && | |
335 | (tag != PCI_VPD_LTIN_RO_DATA) && | |
336 | (tag != PCI_VPD_LTIN_RW_DATA)) { | |
337 | dev_warn(&dev->dev, | |
338 | "invalid %s VPD tag %02x at offset %zu", | |
339 | (header[0] & PCI_VPD_LRDT) ? "large" : "short", | |
340 | tag, off); | |
341 | return 0; | |
342 | } | |
343 | } | |
344 | return 0; | |
345 | } | |
346 | ||
1120f8b8 SH |
347 | /* |
348 | * Wait for last operation to complete. | |
349 | * This code has to spin since there is no other notification from the PCI | |
350 | * hardware. Since the VPD is often implemented by serial attachment to an | |
351 | * EEPROM, it may take many milliseconds to complete. | |
34e32072 GT |
352 | * |
353 | * Returns 0 on success, negative values indicate error. | |
1120f8b8 | 354 | */ |
f1cd93f9 | 355 | static int pci_vpd_wait(struct pci_dev *dev) |
94e61088 | 356 | { |
408641e9 | 357 | struct pci_vpd *vpd = dev->vpd; |
c521b014 BH |
358 | unsigned long timeout = jiffies + msecs_to_jiffies(50); |
359 | unsigned long max_sleep = 16; | |
1120f8b8 | 360 | u16 status; |
94e61088 BH |
361 | int ret; |
362 | ||
363 | if (!vpd->busy) | |
364 | return 0; | |
365 | ||
c521b014 | 366 | while (time_before(jiffies, timeout)) { |
1120f8b8 | 367 | ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR, |
94e61088 | 368 | &status); |
34e32072 | 369 | if (ret < 0) |
94e61088 | 370 | return ret; |
1120f8b8 SH |
371 | |
372 | if ((status & PCI_VPD_ADDR_F) == vpd->flag) { | |
c5563887 | 373 | vpd->busy = 0; |
94e61088 BH |
374 | return 0; |
375 | } | |
1120f8b8 | 376 | |
1120f8b8 SH |
377 | if (fatal_signal_pending(current)) |
378 | return -EINTR; | |
c521b014 BH |
379 | |
380 | usleep_range(10, max_sleep); | |
381 | if (max_sleep < 1024) | |
382 | max_sleep *= 2; | |
94e61088 | 383 | } |
c521b014 BH |
384 | |
385 | dev_warn(&dev->dev, "VPD access failed. This is likely a firmware bug on this device. Contact the card vendor for a firmware update\n"); | |
386 | return -ETIMEDOUT; | |
94e61088 BH |
387 | } |
388 | ||
f1cd93f9 BH |
389 | static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count, |
390 | void *arg) | |
94e61088 | 391 | { |
408641e9 | 392 | struct pci_vpd *vpd = dev->vpd; |
287d19ce SH |
393 | int ret; |
394 | loff_t end = pos + count; | |
395 | u8 *buf = arg; | |
94e61088 | 396 | |
104daa71 | 397 | if (pos < 0) |
94e61088 | 398 | return -EINVAL; |
94e61088 | 399 | |
104daa71 HR |
400 | if (!vpd->valid) { |
401 | vpd->valid = 1; | |
408641e9 | 402 | vpd->len = pci_vpd_size(dev, vpd->len); |
104daa71 HR |
403 | } |
404 | ||
408641e9 | 405 | if (vpd->len == 0) |
104daa71 HR |
406 | return -EIO; |
407 | ||
408641e9 | 408 | if (pos > vpd->len) |
104daa71 HR |
409 | return 0; |
410 | ||
408641e9 BH |
411 | if (end > vpd->len) { |
412 | end = vpd->len; | |
104daa71 HR |
413 | count = end - pos; |
414 | } | |
415 | ||
1120f8b8 SH |
416 | if (mutex_lock_killable(&vpd->lock)) |
417 | return -EINTR; | |
418 | ||
f1cd93f9 | 419 | ret = pci_vpd_wait(dev); |
94e61088 BH |
420 | if (ret < 0) |
421 | goto out; | |
1120f8b8 | 422 | |
287d19ce SH |
423 | while (pos < end) { |
424 | u32 val; | |
425 | unsigned int i, skip; | |
426 | ||
427 | ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR, | |
428 | pos & ~3); | |
429 | if (ret < 0) | |
430 | break; | |
c5563887 | 431 | vpd->busy = 1; |
287d19ce | 432 | vpd->flag = PCI_VPD_ADDR_F; |
f1cd93f9 | 433 | ret = pci_vpd_wait(dev); |
287d19ce SH |
434 | if (ret < 0) |
435 | break; | |
436 | ||
437 | ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val); | |
438 | if (ret < 0) | |
439 | break; | |
440 | ||
441 | skip = pos & 3; | |
442 | for (i = 0; i < sizeof(u32); i++) { | |
443 | if (i >= skip) { | |
444 | *buf++ = val; | |
445 | if (++pos == end) | |
446 | break; | |
447 | } | |
448 | val >>= 8; | |
449 | } | |
450 | } | |
94e61088 | 451 | out: |
1120f8b8 | 452 | mutex_unlock(&vpd->lock); |
287d19ce | 453 | return ret ? ret : count; |
94e61088 BH |
454 | } |
455 | ||
f1cd93f9 BH |
456 | static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count, |
457 | const void *arg) | |
94e61088 | 458 | { |
408641e9 | 459 | struct pci_vpd *vpd = dev->vpd; |
287d19ce SH |
460 | const u8 *buf = arg; |
461 | loff_t end = pos + count; | |
1120f8b8 | 462 | int ret = 0; |
94e61088 | 463 | |
104daa71 HR |
464 | if (pos < 0 || (pos & 3) || (count & 3)) |
465 | return -EINVAL; | |
466 | ||
467 | if (!vpd->valid) { | |
468 | vpd->valid = 1; | |
408641e9 | 469 | vpd->len = pci_vpd_size(dev, vpd->len); |
104daa71 HR |
470 | } |
471 | ||
408641e9 | 472 | if (vpd->len == 0) |
104daa71 HR |
473 | return -EIO; |
474 | ||
408641e9 | 475 | if (end > vpd->len) |
94e61088 BH |
476 | return -EINVAL; |
477 | ||
1120f8b8 SH |
478 | if (mutex_lock_killable(&vpd->lock)) |
479 | return -EINTR; | |
287d19ce | 480 | |
f1cd93f9 | 481 | ret = pci_vpd_wait(dev); |
94e61088 BH |
482 | if (ret < 0) |
483 | goto out; | |
287d19ce SH |
484 | |
485 | while (pos < end) { | |
486 | u32 val; | |
487 | ||
488 | val = *buf++; | |
489 | val |= *buf++ << 8; | |
490 | val |= *buf++ << 16; | |
491 | val |= *buf++ << 24; | |
492 | ||
493 | ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, val); | |
494 | if (ret < 0) | |
495 | break; | |
496 | ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR, | |
497 | pos | PCI_VPD_ADDR_F); | |
498 | if (ret < 0) | |
499 | break; | |
500 | ||
c5563887 | 501 | vpd->busy = 1; |
287d19ce | 502 | vpd->flag = 0; |
f1cd93f9 | 503 | ret = pci_vpd_wait(dev); |
d97ecd81 GT |
504 | if (ret < 0) |
505 | break; | |
287d19ce SH |
506 | |
507 | pos += sizeof(u32); | |
508 | } | |
94e61088 | 509 | out: |
1120f8b8 | 510 | mutex_unlock(&vpd->lock); |
287d19ce | 511 | return ret ? ret : count; |
94e61088 BH |
512 | } |
513 | ||
cb92148b HS |
514 | static int pci_vpd_set_size(struct pci_dev *dev, size_t len) |
515 | { | |
516 | struct pci_vpd *vpd = dev->vpd; | |
517 | ||
518 | if (len == 0 || len > PCI_VPD_MAX_SIZE) | |
519 | return -EIO; | |
520 | ||
521 | vpd->valid = 1; | |
522 | vpd->len = len; | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
f1cd93f9 BH |
527 | static const struct pci_vpd_ops pci_vpd_ops = { |
528 | .read = pci_vpd_read, | |
529 | .write = pci_vpd_write, | |
cb92148b | 530 | .set_size = pci_vpd_set_size, |
94e61088 BH |
531 | }; |
532 | ||
932c435c MR |
533 | static ssize_t pci_vpd_f0_read(struct pci_dev *dev, loff_t pos, size_t count, |
534 | void *arg) | |
535 | { | |
9d924075 AW |
536 | struct pci_dev *tdev = pci_get_slot(dev->bus, |
537 | PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); | |
932c435c MR |
538 | ssize_t ret; |
539 | ||
540 | if (!tdev) | |
541 | return -ENODEV; | |
542 | ||
543 | ret = pci_read_vpd(tdev, pos, count, arg); | |
544 | pci_dev_put(tdev); | |
545 | return ret; | |
546 | } | |
547 | ||
548 | static ssize_t pci_vpd_f0_write(struct pci_dev *dev, loff_t pos, size_t count, | |
549 | const void *arg) | |
550 | { | |
9d924075 AW |
551 | struct pci_dev *tdev = pci_get_slot(dev->bus, |
552 | PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); | |
932c435c MR |
553 | ssize_t ret; |
554 | ||
555 | if (!tdev) | |
556 | return -ENODEV; | |
557 | ||
558 | ret = pci_write_vpd(tdev, pos, count, arg); | |
559 | pci_dev_put(tdev); | |
560 | return ret; | |
561 | } | |
562 | ||
cb92148b HS |
563 | static int pci_vpd_f0_set_size(struct pci_dev *dev, size_t len) |
564 | { | |
565 | struct pci_dev *tdev = pci_get_slot(dev->bus, | |
566 | PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); | |
567 | int ret; | |
568 | ||
569 | if (!tdev) | |
570 | return -ENODEV; | |
571 | ||
572 | ret = pci_set_vpd_size(tdev, len); | |
573 | pci_dev_put(tdev); | |
574 | return ret; | |
575 | } | |
576 | ||
932c435c MR |
577 | static const struct pci_vpd_ops pci_vpd_f0_ops = { |
578 | .read = pci_vpd_f0_read, | |
579 | .write = pci_vpd_f0_write, | |
cb92148b | 580 | .set_size = pci_vpd_f0_set_size, |
932c435c MR |
581 | }; |
582 | ||
f1cd93f9 | 583 | int pci_vpd_init(struct pci_dev *dev) |
94e61088 | 584 | { |
408641e9 | 585 | struct pci_vpd *vpd; |
94e61088 BH |
586 | u8 cap; |
587 | ||
588 | cap = pci_find_capability(dev, PCI_CAP_ID_VPD); | |
589 | if (!cap) | |
590 | return -ENODEV; | |
932c435c | 591 | |
94e61088 BH |
592 | vpd = kzalloc(sizeof(*vpd), GFP_ATOMIC); |
593 | if (!vpd) | |
594 | return -ENOMEM; | |
595 | ||
408641e9 | 596 | vpd->len = PCI_VPD_MAX_SIZE; |
932c435c | 597 | if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) |
408641e9 | 598 | vpd->ops = &pci_vpd_f0_ops; |
932c435c | 599 | else |
408641e9 | 600 | vpd->ops = &pci_vpd_ops; |
1120f8b8 | 601 | mutex_init(&vpd->lock); |
94e61088 | 602 | vpd->cap = cap; |
c5563887 | 603 | vpd->busy = 0; |
104daa71 | 604 | vpd->valid = 0; |
408641e9 | 605 | dev->vpd = vpd; |
94e61088 BH |
606 | return 0; |
607 | } | |
608 | ||
64379079 BH |
609 | void pci_vpd_release(struct pci_dev *dev) |
610 | { | |
408641e9 | 611 | kfree(dev->vpd); |
64379079 BH |
612 | } |
613 | ||
e04b0ea2 | 614 | /** |
fb51ccbf | 615 | * pci_cfg_access_lock - Lock PCI config reads/writes |
e04b0ea2 BK |
616 | * @dev: pci device struct |
617 | * | |
fb51ccbf JK |
618 | * When access is locked, any userspace reads or writes to config |
619 | * space and concurrent lock requests will sleep until access is | |
620 | * allowed via pci_cfg_access_unlocked again. | |
7ea7e98f | 621 | */ |
fb51ccbf JK |
622 | void pci_cfg_access_lock(struct pci_dev *dev) |
623 | { | |
624 | might_sleep(); | |
625 | ||
626 | raw_spin_lock_irq(&pci_lock); | |
627 | if (dev->block_cfg_access) | |
628 | pci_wait_cfg(dev); | |
629 | dev->block_cfg_access = 1; | |
630 | raw_spin_unlock_irq(&pci_lock); | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(pci_cfg_access_lock); | |
633 | ||
634 | /** | |
635 | * pci_cfg_access_trylock - try to lock PCI config reads/writes | |
636 | * @dev: pci device struct | |
637 | * | |
638 | * Same as pci_cfg_access_lock, but will return 0 if access is | |
639 | * already locked, 1 otherwise. This function can be used from | |
640 | * atomic contexts. | |
641 | */ | |
642 | bool pci_cfg_access_trylock(struct pci_dev *dev) | |
e04b0ea2 BK |
643 | { |
644 | unsigned long flags; | |
fb51ccbf | 645 | bool locked = true; |
e04b0ea2 | 646 | |
511dd98c | 647 | raw_spin_lock_irqsave(&pci_lock, flags); |
fb51ccbf JK |
648 | if (dev->block_cfg_access) |
649 | locked = false; | |
650 | else | |
651 | dev->block_cfg_access = 1; | |
511dd98c | 652 | raw_spin_unlock_irqrestore(&pci_lock, flags); |
7ea7e98f | 653 | |
fb51ccbf | 654 | return locked; |
e04b0ea2 | 655 | } |
fb51ccbf | 656 | EXPORT_SYMBOL_GPL(pci_cfg_access_trylock); |
e04b0ea2 BK |
657 | |
658 | /** | |
fb51ccbf | 659 | * pci_cfg_access_unlock - Unlock PCI config reads/writes |
e04b0ea2 BK |
660 | * @dev: pci device struct |
661 | * | |
fb51ccbf | 662 | * This function allows PCI config accesses to resume. |
7ea7e98f | 663 | */ |
fb51ccbf | 664 | void pci_cfg_access_unlock(struct pci_dev *dev) |
e04b0ea2 BK |
665 | { |
666 | unsigned long flags; | |
667 | ||
511dd98c | 668 | raw_spin_lock_irqsave(&pci_lock, flags); |
7ea7e98f MW |
669 | |
670 | /* This indicates a problem in the caller, but we don't need | |
671 | * to kill them, unlike a double-block above. */ | |
fb51ccbf | 672 | WARN_ON(!dev->block_cfg_access); |
7ea7e98f | 673 | |
fb51ccbf JK |
674 | dev->block_cfg_access = 0; |
675 | wake_up_all(&pci_cfg_wait); | |
511dd98c | 676 | raw_spin_unlock_irqrestore(&pci_lock, flags); |
e04b0ea2 | 677 | } |
fb51ccbf | 678 | EXPORT_SYMBOL_GPL(pci_cfg_access_unlock); |
8c0d3a02 JL |
679 | |
680 | static inline int pcie_cap_version(const struct pci_dev *dev) | |
681 | { | |
1c531d82 | 682 | return pcie_caps_reg(dev) & PCI_EXP_FLAGS_VERS; |
8c0d3a02 JL |
683 | } |
684 | ||
ffb4d602 BH |
685 | static bool pcie_downstream_port(const struct pci_dev *dev) |
686 | { | |
687 | int type = pci_pcie_type(dev); | |
688 | ||
689 | return type == PCI_EXP_TYPE_ROOT_PORT || | |
690 | type == PCI_EXP_TYPE_DOWNSTREAM; | |
691 | } | |
692 | ||
7a1562d4 | 693 | bool pcie_cap_has_lnkctl(const struct pci_dev *dev) |
8c0d3a02 JL |
694 | { |
695 | int type = pci_pcie_type(dev); | |
696 | ||
c8b303d0 | 697 | return type == PCI_EXP_TYPE_ENDPOINT || |
d3694d4f BH |
698 | type == PCI_EXP_TYPE_LEG_END || |
699 | type == PCI_EXP_TYPE_ROOT_PORT || | |
700 | type == PCI_EXP_TYPE_UPSTREAM || | |
701 | type == PCI_EXP_TYPE_DOWNSTREAM || | |
702 | type == PCI_EXP_TYPE_PCI_BRIDGE || | |
703 | type == PCI_EXP_TYPE_PCIE_BRIDGE; | |
8c0d3a02 JL |
704 | } |
705 | ||
706 | static inline bool pcie_cap_has_sltctl(const struct pci_dev *dev) | |
707 | { | |
ffb4d602 | 708 | return pcie_downstream_port(dev) && |
6d3a1741 | 709 | pcie_caps_reg(dev) & PCI_EXP_FLAGS_SLOT; |
8c0d3a02 JL |
710 | } |
711 | ||
712 | static inline bool pcie_cap_has_rtctl(const struct pci_dev *dev) | |
713 | { | |
714 | int type = pci_pcie_type(dev); | |
715 | ||
c8b303d0 | 716 | return type == PCI_EXP_TYPE_ROOT_PORT || |
8c0d3a02 JL |
717 | type == PCI_EXP_TYPE_RC_EC; |
718 | } | |
719 | ||
720 | static bool pcie_capability_reg_implemented(struct pci_dev *dev, int pos) | |
721 | { | |
722 | if (!pci_is_pcie(dev)) | |
723 | return false; | |
724 | ||
725 | switch (pos) { | |
969daa34 | 726 | case PCI_EXP_FLAGS: |
8c0d3a02 JL |
727 | return true; |
728 | case PCI_EXP_DEVCAP: | |
729 | case PCI_EXP_DEVCTL: | |
730 | case PCI_EXP_DEVSTA: | |
fed24515 | 731 | return true; |
8c0d3a02 JL |
732 | case PCI_EXP_LNKCAP: |
733 | case PCI_EXP_LNKCTL: | |
734 | case PCI_EXP_LNKSTA: | |
735 | return pcie_cap_has_lnkctl(dev); | |
736 | case PCI_EXP_SLTCAP: | |
737 | case PCI_EXP_SLTCTL: | |
738 | case PCI_EXP_SLTSTA: | |
739 | return pcie_cap_has_sltctl(dev); | |
740 | case PCI_EXP_RTCTL: | |
741 | case PCI_EXP_RTCAP: | |
742 | case PCI_EXP_RTSTA: | |
743 | return pcie_cap_has_rtctl(dev); | |
744 | case PCI_EXP_DEVCAP2: | |
745 | case PCI_EXP_DEVCTL2: | |
746 | case PCI_EXP_LNKCAP2: | |
747 | case PCI_EXP_LNKCTL2: | |
748 | case PCI_EXP_LNKSTA2: | |
749 | return pcie_cap_version(dev) > 1; | |
750 | default: | |
751 | return false; | |
752 | } | |
753 | } | |
754 | ||
755 | /* | |
756 | * Note that these accessor functions are only for the "PCI Express | |
757 | * Capability" (see PCIe spec r3.0, sec 7.8). They do not apply to the | |
758 | * other "PCI Express Extended Capabilities" (AER, VC, ACS, MFVC, etc.) | |
759 | */ | |
760 | int pcie_capability_read_word(struct pci_dev *dev, int pos, u16 *val) | |
761 | { | |
762 | int ret; | |
763 | ||
764 | *val = 0; | |
765 | if (pos & 1) | |
766 | return -EINVAL; | |
767 | ||
768 | if (pcie_capability_reg_implemented(dev, pos)) { | |
769 | ret = pci_read_config_word(dev, pci_pcie_cap(dev) + pos, val); | |
770 | /* | |
771 | * Reset *val to 0 if pci_read_config_word() fails, it may | |
772 | * have been written as 0xFFFF if hardware error happens | |
773 | * during pci_read_config_word(). | |
774 | */ | |
775 | if (ret) | |
776 | *val = 0; | |
777 | return ret; | |
778 | } | |
779 | ||
780 | /* | |
781 | * For Functions that do not implement the Slot Capabilities, | |
782 | * Slot Status, and Slot Control registers, these spaces must | |
783 | * be hardwired to 0b, with the exception of the Presence Detect | |
784 | * State bit in the Slot Status register of Downstream Ports, | |
785 | * which must be hardwired to 1b. (PCIe Base Spec 3.0, sec 7.8) | |
786 | */ | |
ffb4d602 BH |
787 | if (pci_is_pcie(dev) && pcie_downstream_port(dev) && |
788 | pos == PCI_EXP_SLTSTA) | |
8c0d3a02 | 789 | *val = PCI_EXP_SLTSTA_PDS; |
8c0d3a02 JL |
790 | |
791 | return 0; | |
792 | } | |
793 | EXPORT_SYMBOL(pcie_capability_read_word); | |
794 | ||
795 | int pcie_capability_read_dword(struct pci_dev *dev, int pos, u32 *val) | |
796 | { | |
797 | int ret; | |
798 | ||
799 | *val = 0; | |
800 | if (pos & 3) | |
801 | return -EINVAL; | |
802 | ||
803 | if (pcie_capability_reg_implemented(dev, pos)) { | |
804 | ret = pci_read_config_dword(dev, pci_pcie_cap(dev) + pos, val); | |
805 | /* | |
806 | * Reset *val to 0 if pci_read_config_dword() fails, it may | |
807 | * have been written as 0xFFFFFFFF if hardware error happens | |
808 | * during pci_read_config_dword(). | |
809 | */ | |
810 | if (ret) | |
811 | *val = 0; | |
812 | return ret; | |
813 | } | |
814 | ||
ffb4d602 BH |
815 | if (pci_is_pcie(dev) && pcie_downstream_port(dev) && |
816 | pos == PCI_EXP_SLTSTA) | |
8c0d3a02 | 817 | *val = PCI_EXP_SLTSTA_PDS; |
8c0d3a02 JL |
818 | |
819 | return 0; | |
820 | } | |
821 | EXPORT_SYMBOL(pcie_capability_read_dword); | |
822 | ||
823 | int pcie_capability_write_word(struct pci_dev *dev, int pos, u16 val) | |
824 | { | |
825 | if (pos & 1) | |
826 | return -EINVAL; | |
827 | ||
828 | if (!pcie_capability_reg_implemented(dev, pos)) | |
829 | return 0; | |
830 | ||
831 | return pci_write_config_word(dev, pci_pcie_cap(dev) + pos, val); | |
832 | } | |
833 | EXPORT_SYMBOL(pcie_capability_write_word); | |
834 | ||
835 | int pcie_capability_write_dword(struct pci_dev *dev, int pos, u32 val) | |
836 | { | |
837 | if (pos & 3) | |
838 | return -EINVAL; | |
839 | ||
840 | if (!pcie_capability_reg_implemented(dev, pos)) | |
841 | return 0; | |
842 | ||
843 | return pci_write_config_dword(dev, pci_pcie_cap(dev) + pos, val); | |
844 | } | |
845 | EXPORT_SYMBOL(pcie_capability_write_dword); | |
846 | ||
847 | int pcie_capability_clear_and_set_word(struct pci_dev *dev, int pos, | |
848 | u16 clear, u16 set) | |
849 | { | |
850 | int ret; | |
851 | u16 val; | |
852 | ||
853 | ret = pcie_capability_read_word(dev, pos, &val); | |
854 | if (!ret) { | |
855 | val &= ~clear; | |
856 | val |= set; | |
857 | ret = pcie_capability_write_word(dev, pos, val); | |
858 | } | |
859 | ||
860 | return ret; | |
861 | } | |
862 | EXPORT_SYMBOL(pcie_capability_clear_and_set_word); | |
863 | ||
864 | int pcie_capability_clear_and_set_dword(struct pci_dev *dev, int pos, | |
865 | u32 clear, u32 set) | |
866 | { | |
867 | int ret; | |
868 | u32 val; | |
869 | ||
870 | ret = pcie_capability_read_dword(dev, pos, &val); | |
871 | if (!ret) { | |
872 | val &= ~clear; | |
873 | val |= set; | |
874 | ret = pcie_capability_write_dword(dev, pos, val); | |
875 | } | |
876 | ||
877 | return ret; | |
878 | } | |
879 | EXPORT_SYMBOL(pcie_capability_clear_and_set_dword); |