Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * File: msi.c | |
3 | * Purpose: PCI Message Signaled Interrupt (MSI) | |
4 | * | |
5 | * Copyright (C) 2003-2004 Intel | |
6 | * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) | |
7 | */ | |
8 | ||
1ce03373 | 9 | #include <linux/err.h> |
1da177e4 LT |
10 | #include <linux/mm.h> |
11 | #include <linux/irq.h> | |
12 | #include <linux/interrupt.h> | |
363c75db | 13 | #include <linux/export.h> |
1da177e4 | 14 | #include <linux/ioport.h> |
1da177e4 LT |
15 | #include <linux/pci.h> |
16 | #include <linux/proc_fs.h> | |
3b7d1921 | 17 | #include <linux/msi.h> |
4fdadebc | 18 | #include <linux/smp.h> |
500559a9 HS |
19 | #include <linux/errno.h> |
20 | #include <linux/io.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 LT |
22 | |
23 | #include "pci.h" | |
1da177e4 | 24 | |
1da177e4 | 25 | static int pci_msi_enable = 1; |
1da177e4 | 26 | |
527eee29 BH |
27 | #define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) |
28 | ||
29 | ||
6a9e7f20 AB |
30 | /* Arch hooks */ |
31 | ||
4287d824 TP |
32 | int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) |
33 | { | |
0cbdcfcf TR |
34 | struct msi_chip *chip = dev->bus->msi; |
35 | int err; | |
36 | ||
37 | if (!chip || !chip->setup_irq) | |
38 | return -EINVAL; | |
39 | ||
40 | err = chip->setup_irq(chip, dev, desc); | |
41 | if (err < 0) | |
42 | return err; | |
43 | ||
44 | irq_set_chip_data(desc->irq, chip); | |
45 | ||
46 | return 0; | |
4287d824 TP |
47 | } |
48 | ||
49 | void __weak arch_teardown_msi_irq(unsigned int irq) | |
6a9e7f20 | 50 | { |
0cbdcfcf TR |
51 | struct msi_chip *chip = irq_get_chip_data(irq); |
52 | ||
53 | if (!chip || !chip->teardown_irq) | |
54 | return; | |
55 | ||
56 | chip->teardown_irq(chip, irq); | |
6a9e7f20 AB |
57 | } |
58 | ||
4287d824 TP |
59 | int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type) |
60 | { | |
0cbdcfcf TR |
61 | struct msi_chip *chip = dev->bus->msi; |
62 | ||
63 | if (!chip || !chip->check_device) | |
64 | return 0; | |
65 | ||
66 | return chip->check_device(chip, dev, nvec, type); | |
4287d824 | 67 | } |
1525bf0d | 68 | |
4287d824 | 69 | int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) |
6a9e7f20 AB |
70 | { |
71 | struct msi_desc *entry; | |
72 | int ret; | |
73 | ||
1c8d7b0a MW |
74 | /* |
75 | * If an architecture wants to support multiple MSI, it needs to | |
76 | * override arch_setup_msi_irqs() | |
77 | */ | |
78 | if (type == PCI_CAP_ID_MSI && nvec > 1) | |
79 | return 1; | |
80 | ||
6a9e7f20 AB |
81 | list_for_each_entry(entry, &dev->msi_list, list) { |
82 | ret = arch_setup_msi_irq(dev, entry); | |
b5fbf533 | 83 | if (ret < 0) |
6a9e7f20 | 84 | return ret; |
b5fbf533 ME |
85 | if (ret > 0) |
86 | return -ENOSPC; | |
6a9e7f20 AB |
87 | } |
88 | ||
89 | return 0; | |
90 | } | |
1525bf0d | 91 | |
4287d824 TP |
92 | /* |
93 | * We have a default implementation available as a separate non-weak | |
94 | * function, as it is used by the Xen x86 PCI code | |
95 | */ | |
1525bf0d | 96 | void default_teardown_msi_irqs(struct pci_dev *dev) |
6a9e7f20 AB |
97 | { |
98 | struct msi_desc *entry; | |
99 | ||
100 | list_for_each_entry(entry, &dev->msi_list, list) { | |
1c8d7b0a MW |
101 | int i, nvec; |
102 | if (entry->irq == 0) | |
103 | continue; | |
65f6ae66 AG |
104 | if (entry->nvec_used) |
105 | nvec = entry->nvec_used; | |
106 | else | |
107 | nvec = 1 << entry->msi_attrib.multiple; | |
1c8d7b0a MW |
108 | for (i = 0; i < nvec; i++) |
109 | arch_teardown_msi_irq(entry->irq + i); | |
6a9e7f20 AB |
110 | } |
111 | } | |
112 | ||
4287d824 TP |
113 | void __weak arch_teardown_msi_irqs(struct pci_dev *dev) |
114 | { | |
115 | return default_teardown_msi_irqs(dev); | |
116 | } | |
76ccc297 | 117 | |
ac8344c4 | 118 | static void default_restore_msi_irq(struct pci_dev *dev, int irq) |
76ccc297 KRW |
119 | { |
120 | struct msi_desc *entry; | |
121 | ||
122 | entry = NULL; | |
123 | if (dev->msix_enabled) { | |
124 | list_for_each_entry(entry, &dev->msi_list, list) { | |
125 | if (irq == entry->irq) | |
126 | break; | |
127 | } | |
128 | } else if (dev->msi_enabled) { | |
129 | entry = irq_get_msi_desc(irq); | |
130 | } | |
131 | ||
132 | if (entry) | |
133 | write_msi_msg(irq, &entry->msg); | |
134 | } | |
4287d824 | 135 | |
ac8344c4 | 136 | void __weak arch_restore_msi_irqs(struct pci_dev *dev) |
4287d824 | 137 | { |
ac8344c4 | 138 | return default_restore_msi_irqs(dev); |
4287d824 | 139 | } |
76ccc297 | 140 | |
e375b561 | 141 | static void msi_set_enable(struct pci_dev *dev, int enable) |
b1cbf4e4 | 142 | { |
b1cbf4e4 EB |
143 | u16 control; |
144 | ||
e375b561 | 145 | pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control); |
110828c9 MW |
146 | control &= ~PCI_MSI_FLAGS_ENABLE; |
147 | if (enable) | |
148 | control |= PCI_MSI_FLAGS_ENABLE; | |
e375b561 | 149 | pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control); |
5ca5c02f HS |
150 | } |
151 | ||
66f0d0c4 | 152 | static void msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set) |
b1cbf4e4 | 153 | { |
66f0d0c4 | 154 | u16 ctrl; |
b1cbf4e4 | 155 | |
66f0d0c4 YW |
156 | pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl); |
157 | ctrl &= ~clear; | |
158 | ctrl |= set; | |
159 | pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl); | |
b1cbf4e4 EB |
160 | } |
161 | ||
bffac3c5 MW |
162 | static inline __attribute_const__ u32 msi_mask(unsigned x) |
163 | { | |
0b49ec37 MW |
164 | /* Don't shift by >= width of type */ |
165 | if (x >= 5) | |
166 | return 0xffffffff; | |
167 | return (1 << (1 << x)) - 1; | |
bffac3c5 MW |
168 | } |
169 | ||
ce6fce42 MW |
170 | /* |
171 | * PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to | |
172 | * mask all MSI interrupts by clearing the MSI enable bit does not work | |
173 | * reliably as devices without an INTx disable bit will then generate a | |
174 | * level IRQ which will never be cleared. | |
ce6fce42 | 175 | */ |
0e4ccb15 | 176 | u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag) |
1da177e4 | 177 | { |
f2440d9a | 178 | u32 mask_bits = desc->masked; |
1da177e4 | 179 | |
f2440d9a | 180 | if (!desc->msi_attrib.maskbit) |
12abb8ba | 181 | return 0; |
f2440d9a MW |
182 | |
183 | mask_bits &= ~mask; | |
184 | mask_bits |= flag; | |
185 | pci_write_config_dword(desc->dev, desc->mask_pos, mask_bits); | |
12abb8ba HS |
186 | |
187 | return mask_bits; | |
188 | } | |
189 | ||
0e4ccb15 KRW |
190 | __weak u32 arch_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag) |
191 | { | |
192 | return default_msi_mask_irq(desc, mask, flag); | |
193 | } | |
194 | ||
12abb8ba HS |
195 | static void msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag) |
196 | { | |
0e4ccb15 | 197 | desc->masked = arch_msi_mask_irq(desc, mask, flag); |
f2440d9a MW |
198 | } |
199 | ||
200 | /* | |
201 | * This internal function does not flush PCI writes to the device. | |
202 | * All users must ensure that they read from the device before either | |
203 | * assuming that the device state is up to date, or returning out of this | |
204 | * file. This saves a few milliseconds when initialising devices with lots | |
205 | * of MSI-X interrupts. | |
206 | */ | |
0e4ccb15 | 207 | u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag) |
f2440d9a MW |
208 | { |
209 | u32 mask_bits = desc->masked; | |
210 | unsigned offset = desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE + | |
2c21fd4b | 211 | PCI_MSIX_ENTRY_VECTOR_CTRL; |
8d805286 SY |
212 | mask_bits &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT; |
213 | if (flag) | |
214 | mask_bits |= PCI_MSIX_ENTRY_CTRL_MASKBIT; | |
f2440d9a | 215 | writel(mask_bits, desc->mask_base + offset); |
12abb8ba HS |
216 | |
217 | return mask_bits; | |
218 | } | |
219 | ||
0e4ccb15 KRW |
220 | __weak u32 arch_msix_mask_irq(struct msi_desc *desc, u32 flag) |
221 | { | |
222 | return default_msix_mask_irq(desc, flag); | |
223 | } | |
224 | ||
12abb8ba HS |
225 | static void msix_mask_irq(struct msi_desc *desc, u32 flag) |
226 | { | |
0e4ccb15 | 227 | desc->masked = arch_msix_mask_irq(desc, flag); |
f2440d9a | 228 | } |
24d27553 | 229 | |
1c9db525 | 230 | static void msi_set_mask_bit(struct irq_data *data, u32 flag) |
f2440d9a | 231 | { |
1c9db525 | 232 | struct msi_desc *desc = irq_data_get_msi(data); |
24d27553 | 233 | |
f2440d9a MW |
234 | if (desc->msi_attrib.is_msix) { |
235 | msix_mask_irq(desc, flag); | |
236 | readl(desc->mask_base); /* Flush write to device */ | |
237 | } else { | |
a281b788 | 238 | unsigned offset = data->irq - desc->irq; |
1c8d7b0a | 239 | msi_mask_irq(desc, 1 << offset, flag << offset); |
1da177e4 | 240 | } |
f2440d9a MW |
241 | } |
242 | ||
1c9db525 | 243 | void mask_msi_irq(struct irq_data *data) |
f2440d9a | 244 | { |
1c9db525 | 245 | msi_set_mask_bit(data, 1); |
f2440d9a MW |
246 | } |
247 | ||
1c9db525 | 248 | void unmask_msi_irq(struct irq_data *data) |
f2440d9a | 249 | { |
1c9db525 | 250 | msi_set_mask_bit(data, 0); |
1da177e4 LT |
251 | } |
252 | ||
ac8344c4 D |
253 | void default_restore_msi_irqs(struct pci_dev *dev) |
254 | { | |
255 | struct msi_desc *entry; | |
256 | ||
257 | list_for_each_entry(entry, &dev->msi_list, list) { | |
258 | default_restore_msi_irq(dev, entry->irq); | |
259 | } | |
260 | } | |
261 | ||
39431acb | 262 | void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg) |
1da177e4 | 263 | { |
30da5524 BH |
264 | BUG_ON(entry->dev->current_state != PCI_D0); |
265 | ||
266 | if (entry->msi_attrib.is_msix) { | |
267 | void __iomem *base = entry->mask_base + | |
268 | entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE; | |
269 | ||
270 | msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR); | |
271 | msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR); | |
272 | msg->data = readl(base + PCI_MSIX_ENTRY_DATA); | |
273 | } else { | |
274 | struct pci_dev *dev = entry->dev; | |
f5322169 | 275 | int pos = dev->msi_cap; |
30da5524 BH |
276 | u16 data; |
277 | ||
9925ad0c BH |
278 | pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, |
279 | &msg->address_lo); | |
30da5524 | 280 | if (entry->msi_attrib.is_64) { |
9925ad0c BH |
281 | pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, |
282 | &msg->address_hi); | |
2f221349 | 283 | pci_read_config_word(dev, pos + PCI_MSI_DATA_64, &data); |
30da5524 BH |
284 | } else { |
285 | msg->address_hi = 0; | |
2f221349 | 286 | pci_read_config_word(dev, pos + PCI_MSI_DATA_32, &data); |
30da5524 BH |
287 | } |
288 | msg->data = data; | |
289 | } | |
290 | } | |
291 | ||
292 | void read_msi_msg(unsigned int irq, struct msi_msg *msg) | |
293 | { | |
dced35ae | 294 | struct msi_desc *entry = irq_get_msi_desc(irq); |
30da5524 | 295 | |
39431acb | 296 | __read_msi_msg(entry, msg); |
30da5524 BH |
297 | } |
298 | ||
39431acb | 299 | void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg) |
30da5524 | 300 | { |
30da5524 | 301 | /* Assert that the cache is valid, assuming that |
fcd097f3 BH |
302 | * valid messages are not all-zeroes. */ |
303 | BUG_ON(!(entry->msg.address_hi | entry->msg.address_lo | | |
304 | entry->msg.data)); | |
0366f8f7 | 305 | |
fcd097f3 | 306 | *msg = entry->msg; |
0366f8f7 | 307 | } |
1da177e4 | 308 | |
30da5524 | 309 | void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg) |
0366f8f7 | 310 | { |
dced35ae | 311 | struct msi_desc *entry = irq_get_msi_desc(irq); |
3145e941 | 312 | |
39431acb | 313 | __get_cached_msi_msg(entry, msg); |
3145e941 YL |
314 | } |
315 | ||
39431acb | 316 | void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg) |
3145e941 | 317 | { |
fcd097f3 BH |
318 | if (entry->dev->current_state != PCI_D0) { |
319 | /* Don't touch the hardware now */ | |
320 | } else if (entry->msi_attrib.is_msix) { | |
24d27553 MW |
321 | void __iomem *base; |
322 | base = entry->mask_base + | |
323 | entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE; | |
324 | ||
2c21fd4b HS |
325 | writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR); |
326 | writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR); | |
327 | writel(msg->data, base + PCI_MSIX_ENTRY_DATA); | |
24d27553 | 328 | } else { |
0366f8f7 | 329 | struct pci_dev *dev = entry->dev; |
f5322169 | 330 | int pos = dev->msi_cap; |
1c8d7b0a MW |
331 | u16 msgctl; |
332 | ||
f84ecd28 | 333 | pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl); |
1c8d7b0a MW |
334 | msgctl &= ~PCI_MSI_FLAGS_QSIZE; |
335 | msgctl |= entry->msi_attrib.multiple << 4; | |
f84ecd28 | 336 | pci_write_config_word(dev, pos + PCI_MSI_FLAGS, msgctl); |
0366f8f7 | 337 | |
9925ad0c BH |
338 | pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, |
339 | msg->address_lo); | |
0366f8f7 | 340 | if (entry->msi_attrib.is_64) { |
9925ad0c BH |
341 | pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, |
342 | msg->address_hi); | |
2f221349 BH |
343 | pci_write_config_word(dev, pos + PCI_MSI_DATA_64, |
344 | msg->data); | |
0366f8f7 | 345 | } else { |
2f221349 BH |
346 | pci_write_config_word(dev, pos + PCI_MSI_DATA_32, |
347 | msg->data); | |
0366f8f7 | 348 | } |
1da177e4 | 349 | } |
392ee1e6 | 350 | entry->msg = *msg; |
1da177e4 | 351 | } |
0366f8f7 | 352 | |
3145e941 YL |
353 | void write_msi_msg(unsigned int irq, struct msi_msg *msg) |
354 | { | |
dced35ae | 355 | struct msi_desc *entry = irq_get_msi_desc(irq); |
3145e941 | 356 | |
39431acb | 357 | __write_msi_msg(entry, msg); |
3145e941 YL |
358 | } |
359 | ||
f56e4481 HS |
360 | static void free_msi_irqs(struct pci_dev *dev) |
361 | { | |
362 | struct msi_desc *entry, *tmp; | |
1c51b50c GKH |
363 | struct attribute **msi_attrs; |
364 | struct device_attribute *dev_attr; | |
365 | int count = 0; | |
f56e4481 HS |
366 | |
367 | list_for_each_entry(entry, &dev->msi_list, list) { | |
368 | int i, nvec; | |
369 | if (!entry->irq) | |
370 | continue; | |
65f6ae66 AG |
371 | if (entry->nvec_used) |
372 | nvec = entry->nvec_used; | |
373 | else | |
374 | nvec = 1 << entry->msi_attrib.multiple; | |
f56e4481 HS |
375 | for (i = 0; i < nvec; i++) |
376 | BUG_ON(irq_has_action(entry->irq + i)); | |
377 | } | |
378 | ||
379 | arch_teardown_msi_irqs(dev); | |
380 | ||
381 | list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) { | |
382 | if (entry->msi_attrib.is_msix) { | |
383 | if (list_is_last(&entry->list, &dev->msi_list)) | |
384 | iounmap(entry->mask_base); | |
385 | } | |
424eb391 NH |
386 | |
387 | /* | |
388 | * Its possible that we get into this path | |
389 | * When populate_msi_sysfs fails, which means the entries | |
390 | * were not registered with sysfs. In that case don't | |
391 | * unregister them. | |
392 | */ | |
393 | if (entry->kobj.parent) { | |
394 | kobject_del(&entry->kobj); | |
395 | kobject_put(&entry->kobj); | |
396 | } | |
397 | ||
f56e4481 HS |
398 | list_del(&entry->list); |
399 | kfree(entry); | |
400 | } | |
1c51b50c GKH |
401 | |
402 | if (dev->msi_irq_groups) { | |
403 | sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups); | |
404 | msi_attrs = dev->msi_irq_groups[0]->attrs; | |
b701c0b1 | 405 | while (msi_attrs[count]) { |
1c51b50c GKH |
406 | dev_attr = container_of(msi_attrs[count], |
407 | struct device_attribute, attr); | |
408 | kfree(dev_attr->attr.name); | |
409 | kfree(dev_attr); | |
410 | ++count; | |
411 | } | |
412 | kfree(msi_attrs); | |
413 | kfree(dev->msi_irq_groups[0]); | |
414 | kfree(dev->msi_irq_groups); | |
415 | dev->msi_irq_groups = NULL; | |
416 | } | |
f56e4481 | 417 | } |
c54c1879 | 418 | |
379f5327 | 419 | static struct msi_desc *alloc_msi_entry(struct pci_dev *dev) |
1da177e4 | 420 | { |
379f5327 MW |
421 | struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL); |
422 | if (!desc) | |
1da177e4 LT |
423 | return NULL; |
424 | ||
379f5327 MW |
425 | INIT_LIST_HEAD(&desc->list); |
426 | desc->dev = dev; | |
1da177e4 | 427 | |
379f5327 | 428 | return desc; |
1da177e4 LT |
429 | } |
430 | ||
ba698ad4 DM |
431 | static void pci_intx_for_msi(struct pci_dev *dev, int enable) |
432 | { | |
433 | if (!(dev->dev_flags & PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG)) | |
434 | pci_intx(dev, enable); | |
435 | } | |
436 | ||
8fed4b65 | 437 | static void __pci_restore_msi_state(struct pci_dev *dev) |
41017f0c | 438 | { |
41017f0c | 439 | u16 control; |
392ee1e6 | 440 | struct msi_desc *entry; |
41017f0c | 441 | |
b1cbf4e4 EB |
442 | if (!dev->msi_enabled) |
443 | return; | |
444 | ||
dced35ae | 445 | entry = irq_get_msi_desc(dev->irq); |
41017f0c | 446 | |
ba698ad4 | 447 | pci_intx_for_msi(dev, 0); |
e375b561 | 448 | msi_set_enable(dev, 0); |
ac8344c4 | 449 | arch_restore_msi_irqs(dev); |
392ee1e6 | 450 | |
f5322169 | 451 | pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control); |
31ea5d4d YW |
452 | msi_mask_irq(entry, msi_mask(entry->msi_attrib.multi_cap), |
453 | entry->masked); | |
abad2ec9 | 454 | control &= ~PCI_MSI_FLAGS_QSIZE; |
1c8d7b0a | 455 | control |= (entry->msi_attrib.multiple << 4) | PCI_MSI_FLAGS_ENABLE; |
f5322169 | 456 | pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control); |
8fed4b65 ME |
457 | } |
458 | ||
459 | static void __pci_restore_msix_state(struct pci_dev *dev) | |
41017f0c | 460 | { |
41017f0c | 461 | struct msi_desc *entry; |
41017f0c | 462 | |
ded86d8d EB |
463 | if (!dev->msix_enabled) |
464 | return; | |
f598282f | 465 | BUG_ON(list_empty(&dev->msi_list)); |
ded86d8d | 466 | |
41017f0c | 467 | /* route the table */ |
ba698ad4 | 468 | pci_intx_for_msi(dev, 0); |
66f0d0c4 YW |
469 | msix_clear_and_set_ctrl(dev, 0, |
470 | PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL); | |
41017f0c | 471 | |
ac8344c4 | 472 | arch_restore_msi_irqs(dev); |
4aa9bc95 | 473 | list_for_each_entry(entry, &dev->msi_list, list) { |
f2440d9a | 474 | msix_mask_irq(entry, entry->masked); |
41017f0c | 475 | } |
41017f0c | 476 | |
66f0d0c4 | 477 | msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0); |
41017f0c | 478 | } |
8fed4b65 ME |
479 | |
480 | void pci_restore_msi_state(struct pci_dev *dev) | |
481 | { | |
482 | __pci_restore_msi_state(dev); | |
483 | __pci_restore_msix_state(dev); | |
484 | } | |
94688cf2 | 485 | EXPORT_SYMBOL_GPL(pci_restore_msi_state); |
41017f0c | 486 | |
1c51b50c | 487 | static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr, |
da8d1c8b NH |
488 | char *buf) |
489 | { | |
1c51b50c GKH |
490 | struct msi_desc *entry; |
491 | unsigned long irq; | |
492 | int retval; | |
da8d1c8b | 493 | |
1c51b50c GKH |
494 | retval = kstrtoul(attr->attr.name, 10, &irq); |
495 | if (retval) | |
496 | return retval; | |
da8d1c8b | 497 | |
e11ece5a YW |
498 | entry = irq_get_msi_desc(irq); |
499 | if (entry) | |
500 | return sprintf(buf, "%s\n", | |
501 | entry->msi_attrib.is_msix ? "msix" : "msi"); | |
502 | ||
1c51b50c | 503 | return -ENODEV; |
da8d1c8b NH |
504 | } |
505 | ||
da8d1c8b NH |
506 | static int populate_msi_sysfs(struct pci_dev *pdev) |
507 | { | |
1c51b50c GKH |
508 | struct attribute **msi_attrs; |
509 | struct attribute *msi_attr; | |
510 | struct device_attribute *msi_dev_attr; | |
511 | struct attribute_group *msi_irq_group; | |
512 | const struct attribute_group **msi_irq_groups; | |
da8d1c8b | 513 | struct msi_desc *entry; |
1c51b50c GKH |
514 | int ret = -ENOMEM; |
515 | int num_msi = 0; | |
da8d1c8b NH |
516 | int count = 0; |
517 | ||
1c51b50c GKH |
518 | /* Determine how many msi entries we have */ |
519 | list_for_each_entry(entry, &pdev->msi_list, list) { | |
520 | ++num_msi; | |
521 | } | |
522 | if (!num_msi) | |
523 | return 0; | |
da8d1c8b | 524 | |
1c51b50c GKH |
525 | /* Dynamically create the MSI attributes for the PCI device */ |
526 | msi_attrs = kzalloc(sizeof(void *) * (num_msi + 1), GFP_KERNEL); | |
527 | if (!msi_attrs) | |
528 | return -ENOMEM; | |
da8d1c8b | 529 | list_for_each_entry(entry, &pdev->msi_list, list) { |
1c51b50c | 530 | msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL); |
1406276c | 531 | if (!msi_dev_attr) |
1c51b50c | 532 | goto error_attrs; |
1406276c | 533 | msi_attrs[count] = &msi_dev_attr->attr; |
86bb4f69 | 534 | |
1c51b50c | 535 | sysfs_attr_init(&msi_dev_attr->attr); |
1406276c JB |
536 | msi_dev_attr->attr.name = kasprintf(GFP_KERNEL, "%d", |
537 | entry->irq); | |
538 | if (!msi_dev_attr->attr.name) | |
539 | goto error_attrs; | |
1c51b50c GKH |
540 | msi_dev_attr->attr.mode = S_IRUGO; |
541 | msi_dev_attr->show = msi_mode_show; | |
1c51b50c | 542 | ++count; |
da8d1c8b NH |
543 | } |
544 | ||
1c51b50c GKH |
545 | msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL); |
546 | if (!msi_irq_group) | |
547 | goto error_attrs; | |
548 | msi_irq_group->name = "msi_irqs"; | |
549 | msi_irq_group->attrs = msi_attrs; | |
550 | ||
551 | msi_irq_groups = kzalloc(sizeof(void *) * 2, GFP_KERNEL); | |
552 | if (!msi_irq_groups) | |
553 | goto error_irq_group; | |
554 | msi_irq_groups[0] = msi_irq_group; | |
555 | ||
556 | ret = sysfs_create_groups(&pdev->dev.kobj, msi_irq_groups); | |
557 | if (ret) | |
558 | goto error_irq_groups; | |
559 | pdev->msi_irq_groups = msi_irq_groups; | |
560 | ||
da8d1c8b NH |
561 | return 0; |
562 | ||
1c51b50c GKH |
563 | error_irq_groups: |
564 | kfree(msi_irq_groups); | |
565 | error_irq_group: | |
566 | kfree(msi_irq_group); | |
567 | error_attrs: | |
568 | count = 0; | |
569 | msi_attr = msi_attrs[count]; | |
570 | while (msi_attr) { | |
571 | msi_dev_attr = container_of(msi_attr, struct device_attribute, attr); | |
572 | kfree(msi_attr->name); | |
573 | kfree(msi_dev_attr); | |
574 | ++count; | |
575 | msi_attr = msi_attrs[count]; | |
da8d1c8b | 576 | } |
29237756 | 577 | kfree(msi_attrs); |
da8d1c8b NH |
578 | return ret; |
579 | } | |
580 | ||
d873b4d4 YW |
581 | static struct msi_desc *msi_setup_entry(struct pci_dev *dev) |
582 | { | |
583 | u16 control; | |
584 | struct msi_desc *entry; | |
585 | ||
586 | /* MSI Entry Initialization */ | |
587 | entry = alloc_msi_entry(dev); | |
588 | if (!entry) | |
589 | return NULL; | |
590 | ||
591 | pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control); | |
592 | ||
593 | entry->msi_attrib.is_msix = 0; | |
594 | entry->msi_attrib.is_64 = !!(control & PCI_MSI_FLAGS_64BIT); | |
595 | entry->msi_attrib.entry_nr = 0; | |
596 | entry->msi_attrib.maskbit = !!(control & PCI_MSI_FLAGS_MASKBIT); | |
597 | entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */ | |
598 | entry->msi_attrib.pos = dev->msi_cap; | |
599 | entry->msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1; | |
600 | ||
601 | if (control & PCI_MSI_FLAGS_64BIT) | |
602 | entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_64; | |
603 | else | |
604 | entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_32; | |
605 | ||
606 | /* Save the initial mask status */ | |
607 | if (entry->msi_attrib.maskbit) | |
608 | pci_read_config_dword(dev, entry->mask_pos, &entry->masked); | |
609 | ||
610 | return entry; | |
611 | } | |
612 | ||
1da177e4 LT |
613 | /** |
614 | * msi_capability_init - configure device's MSI capability structure | |
615 | * @dev: pointer to the pci_dev data structure of MSI device function | |
1c8d7b0a | 616 | * @nvec: number of interrupts to allocate |
1da177e4 | 617 | * |
1c8d7b0a MW |
618 | * Setup the MSI capability structure of the device with the requested |
619 | * number of interrupts. A return value of zero indicates the successful | |
620 | * setup of an entry with the new MSI irq. A negative return value indicates | |
621 | * an error, and a positive return value indicates the number of interrupts | |
622 | * which could have been allocated. | |
623 | */ | |
624 | static int msi_capability_init(struct pci_dev *dev, int nvec) | |
1da177e4 LT |
625 | { |
626 | struct msi_desc *entry; | |
f465136d | 627 | int ret; |
f2440d9a | 628 | unsigned mask; |
1da177e4 | 629 | |
e375b561 | 630 | msi_set_enable(dev, 0); /* Disable MSI during set up */ |
110828c9 | 631 | |
d873b4d4 | 632 | entry = msi_setup_entry(dev); |
f7feaca7 EB |
633 | if (!entry) |
634 | return -ENOMEM; | |
1ce03373 | 635 | |
f2440d9a | 636 | /* All MSIs are unmasked by default, Mask them all */ |
31ea5d4d | 637 | mask = msi_mask(entry->msi_attrib.multi_cap); |
f2440d9a MW |
638 | msi_mask_irq(entry, mask, mask); |
639 | ||
0dd11f9b | 640 | list_add_tail(&entry->list, &dev->msi_list); |
9c831334 | 641 | |
1da177e4 | 642 | /* Configure MSI capability structure */ |
1c8d7b0a | 643 | ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI); |
7fe3730d | 644 | if (ret) { |
7ba1930d | 645 | msi_mask_irq(entry, mask, ~mask); |
f56e4481 | 646 | free_msi_irqs(dev); |
7fe3730d | 647 | return ret; |
fd58e55f | 648 | } |
f7feaca7 | 649 | |
da8d1c8b NH |
650 | ret = populate_msi_sysfs(dev); |
651 | if (ret) { | |
652 | msi_mask_irq(entry, mask, ~mask); | |
653 | free_msi_irqs(dev); | |
654 | return ret; | |
655 | } | |
656 | ||
1da177e4 | 657 | /* Set MSI enabled bits */ |
ba698ad4 | 658 | pci_intx_for_msi(dev, 0); |
e375b561 | 659 | msi_set_enable(dev, 1); |
b1cbf4e4 | 660 | dev->msi_enabled = 1; |
1da177e4 | 661 | |
7fe3730d | 662 | dev->irq = entry->irq; |
1da177e4 LT |
663 | return 0; |
664 | } | |
665 | ||
520fe9dc | 666 | static void __iomem *msix_map_region(struct pci_dev *dev, unsigned nr_entries) |
5a05a9d8 | 667 | { |
4302e0fb | 668 | resource_size_t phys_addr; |
5a05a9d8 HS |
669 | u32 table_offset; |
670 | u8 bir; | |
671 | ||
909094c6 BH |
672 | pci_read_config_dword(dev, dev->msix_cap + PCI_MSIX_TABLE, |
673 | &table_offset); | |
4d18760c BH |
674 | bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR); |
675 | table_offset &= PCI_MSIX_TABLE_OFFSET; | |
5a05a9d8 HS |
676 | phys_addr = pci_resource_start(dev, bir) + table_offset; |
677 | ||
678 | return ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE); | |
679 | } | |
680 | ||
520fe9dc GS |
681 | static int msix_setup_entries(struct pci_dev *dev, void __iomem *base, |
682 | struct msix_entry *entries, int nvec) | |
d9d7070e HS |
683 | { |
684 | struct msi_desc *entry; | |
685 | int i; | |
686 | ||
687 | for (i = 0; i < nvec; i++) { | |
688 | entry = alloc_msi_entry(dev); | |
689 | if (!entry) { | |
690 | if (!i) | |
691 | iounmap(base); | |
692 | else | |
693 | free_msi_irqs(dev); | |
694 | /* No enough memory. Don't try again */ | |
695 | return -ENOMEM; | |
696 | } | |
697 | ||
698 | entry->msi_attrib.is_msix = 1; | |
699 | entry->msi_attrib.is_64 = 1; | |
700 | entry->msi_attrib.entry_nr = entries[i].entry; | |
701 | entry->msi_attrib.default_irq = dev->irq; | |
520fe9dc | 702 | entry->msi_attrib.pos = dev->msix_cap; |
d9d7070e HS |
703 | entry->mask_base = base; |
704 | ||
705 | list_add_tail(&entry->list, &dev->msi_list); | |
706 | } | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
75cb3426 | 711 | static void msix_program_entries(struct pci_dev *dev, |
520fe9dc | 712 | struct msix_entry *entries) |
75cb3426 HS |
713 | { |
714 | struct msi_desc *entry; | |
715 | int i = 0; | |
716 | ||
717 | list_for_each_entry(entry, &dev->msi_list, list) { | |
718 | int offset = entries[i].entry * PCI_MSIX_ENTRY_SIZE + | |
719 | PCI_MSIX_ENTRY_VECTOR_CTRL; | |
720 | ||
721 | entries[i].vector = entry->irq; | |
dced35ae | 722 | irq_set_msi_desc(entry->irq, entry); |
75cb3426 HS |
723 | entry->masked = readl(entry->mask_base + offset); |
724 | msix_mask_irq(entry, 1); | |
725 | i++; | |
726 | } | |
727 | } | |
728 | ||
1da177e4 LT |
729 | /** |
730 | * msix_capability_init - configure device's MSI-X capability | |
731 | * @dev: pointer to the pci_dev data structure of MSI-X device function | |
8f7020d3 RD |
732 | * @entries: pointer to an array of struct msix_entry entries |
733 | * @nvec: number of @entries | |
1da177e4 | 734 | * |
eaae4b3a | 735 | * Setup the MSI-X capability structure of device function with a |
1ce03373 EB |
736 | * single MSI-X irq. A return of zero indicates the successful setup of |
737 | * requested MSI-X entries with allocated irqs or non-zero for otherwise. | |
1da177e4 LT |
738 | **/ |
739 | static int msix_capability_init(struct pci_dev *dev, | |
740 | struct msix_entry *entries, int nvec) | |
741 | { | |
520fe9dc | 742 | int ret; |
5a05a9d8 | 743 | u16 control; |
1da177e4 LT |
744 | void __iomem *base; |
745 | ||
f598282f | 746 | /* Ensure MSI-X is disabled while it is set up */ |
66f0d0c4 | 747 | msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0); |
f598282f | 748 | |
66f0d0c4 | 749 | pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control); |
1da177e4 | 750 | /* Request & Map MSI-X table region */ |
527eee29 | 751 | base = msix_map_region(dev, msix_table_size(control)); |
5a05a9d8 | 752 | if (!base) |
1da177e4 LT |
753 | return -ENOMEM; |
754 | ||
520fe9dc | 755 | ret = msix_setup_entries(dev, base, entries, nvec); |
d9d7070e HS |
756 | if (ret) |
757 | return ret; | |
9c831334 ME |
758 | |
759 | ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX); | |
583871d4 | 760 | if (ret) |
2adc7907 | 761 | goto out_avail; |
9c831334 | 762 | |
f598282f MW |
763 | /* |
764 | * Some devices require MSI-X to be enabled before we can touch the | |
765 | * MSI-X registers. We need to mask all the vectors to prevent | |
766 | * interrupts coming in before they're fully set up. | |
767 | */ | |
66f0d0c4 YW |
768 | msix_clear_and_set_ctrl(dev, 0, |
769 | PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE); | |
f598282f | 770 | |
75cb3426 | 771 | msix_program_entries(dev, entries); |
f598282f | 772 | |
da8d1c8b | 773 | ret = populate_msi_sysfs(dev); |
2adc7907 AG |
774 | if (ret) |
775 | goto out_free; | |
da8d1c8b | 776 | |
f598282f | 777 | /* Set MSI-X enabled bits and unmask the function */ |
ba698ad4 | 778 | pci_intx_for_msi(dev, 0); |
b1cbf4e4 | 779 | dev->msix_enabled = 1; |
1da177e4 | 780 | |
66f0d0c4 | 781 | msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0); |
8d181018 | 782 | |
1da177e4 | 783 | return 0; |
583871d4 | 784 | |
2adc7907 | 785 | out_avail: |
583871d4 HS |
786 | if (ret < 0) { |
787 | /* | |
788 | * If we had some success, report the number of irqs | |
789 | * we succeeded in setting up. | |
790 | */ | |
d9d7070e | 791 | struct msi_desc *entry; |
583871d4 HS |
792 | int avail = 0; |
793 | ||
794 | list_for_each_entry(entry, &dev->msi_list, list) { | |
795 | if (entry->irq != 0) | |
796 | avail++; | |
797 | } | |
798 | if (avail != 0) | |
799 | ret = avail; | |
800 | } | |
801 | ||
2adc7907 | 802 | out_free: |
583871d4 HS |
803 | free_msi_irqs(dev); |
804 | ||
805 | return ret; | |
1da177e4 LT |
806 | } |
807 | ||
24334a12 | 808 | /** |
17bbc12a | 809 | * pci_msi_check_device - check whether MSI may be enabled on a device |
24334a12 | 810 | * @dev: pointer to the pci_dev data structure of MSI device function |
c9953a73 | 811 | * @nvec: how many MSIs have been requested ? |
b1e2303d | 812 | * @type: are we checking for MSI or MSI-X ? |
24334a12 | 813 | * |
f7625980 | 814 | * Look at global flags, the device itself, and its parent buses |
17bbc12a ME |
815 | * to determine if MSI/-X are supported for the device. If MSI/-X is |
816 | * supported return 0, else return an error code. | |
24334a12 | 817 | **/ |
500559a9 | 818 | static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) |
24334a12 BG |
819 | { |
820 | struct pci_bus *bus; | |
c9953a73 | 821 | int ret; |
24334a12 | 822 | |
0306ebfa | 823 | /* MSI must be globally enabled and supported by the device */ |
24334a12 BG |
824 | if (!pci_msi_enable || !dev || dev->no_msi) |
825 | return -EINVAL; | |
826 | ||
314e77b3 ME |
827 | /* |
828 | * You can't ask to have 0 or less MSIs configured. | |
829 | * a) it's stupid .. | |
830 | * b) the list manipulation code assumes nvec >= 1. | |
831 | */ | |
832 | if (nvec < 1) | |
833 | return -ERANGE; | |
834 | ||
500559a9 HS |
835 | /* |
836 | * Any bridge which does NOT route MSI transactions from its | |
837 | * secondary bus to its primary bus must set NO_MSI flag on | |
0306ebfa BG |
838 | * the secondary pci_bus. |
839 | * We expect only arch-specific PCI host bus controller driver | |
840 | * or quirks for specific PCI bridges to be setting NO_MSI. | |
841 | */ | |
24334a12 BG |
842 | for (bus = dev->bus; bus; bus = bus->parent) |
843 | if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) | |
844 | return -EINVAL; | |
845 | ||
c9953a73 ME |
846 | ret = arch_msi_check_device(dev, nvec, type); |
847 | if (ret) | |
848 | return ret; | |
849 | ||
24334a12 BG |
850 | return 0; |
851 | } | |
852 | ||
d1ac1d26 AG |
853 | /** |
854 | * pci_msi_vec_count - Return the number of MSI vectors a device can send | |
855 | * @dev: device to report about | |
856 | * | |
857 | * This function returns the number of MSI vectors a device requested via | |
858 | * Multiple Message Capable register. It returns a negative errno if the | |
859 | * device is not capable sending MSI interrupts. Otherwise, the call succeeds | |
860 | * and returns a power of two, up to a maximum of 2^5 (32), according to the | |
861 | * MSI specification. | |
862 | **/ | |
863 | int pci_msi_vec_count(struct pci_dev *dev) | |
864 | { | |
865 | int ret; | |
866 | u16 msgctl; | |
867 | ||
868 | if (!dev->msi_cap) | |
869 | return -EINVAL; | |
870 | ||
871 | pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl); | |
872 | ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1); | |
873 | ||
874 | return ret; | |
875 | } | |
876 | EXPORT_SYMBOL(pci_msi_vec_count); | |
877 | ||
f2440d9a | 878 | void pci_msi_shutdown(struct pci_dev *dev) |
1da177e4 | 879 | { |
f2440d9a MW |
880 | struct msi_desc *desc; |
881 | u32 mask; | |
1da177e4 | 882 | |
128bc5fc | 883 | if (!pci_msi_enable || !dev || !dev->msi_enabled) |
ded86d8d EB |
884 | return; |
885 | ||
110828c9 MW |
886 | BUG_ON(list_empty(&dev->msi_list)); |
887 | desc = list_first_entry(&dev->msi_list, struct msi_desc, list); | |
110828c9 | 888 | |
e375b561 | 889 | msi_set_enable(dev, 0); |
ba698ad4 | 890 | pci_intx_for_msi(dev, 1); |
b1cbf4e4 | 891 | dev->msi_enabled = 0; |
7bd007e4 | 892 | |
12abb8ba | 893 | /* Return the device with MSI unmasked as initial states */ |
31ea5d4d | 894 | mask = msi_mask(desc->msi_attrib.multi_cap); |
12abb8ba | 895 | /* Keep cached state to be restored */ |
0e4ccb15 | 896 | arch_msi_mask_irq(desc, mask, ~mask); |
e387b9ee ME |
897 | |
898 | /* Restore dev->irq to its default pin-assertion irq */ | |
f2440d9a | 899 | dev->irq = desc->msi_attrib.default_irq; |
d52877c7 | 900 | } |
24d27553 | 901 | |
500559a9 | 902 | void pci_disable_msi(struct pci_dev *dev) |
d52877c7 | 903 | { |
d52877c7 YL |
904 | if (!pci_msi_enable || !dev || !dev->msi_enabled) |
905 | return; | |
906 | ||
907 | pci_msi_shutdown(dev); | |
f56e4481 | 908 | free_msi_irqs(dev); |
1da177e4 | 909 | } |
4cc086fa | 910 | EXPORT_SYMBOL(pci_disable_msi); |
1da177e4 | 911 | |
a52e2e35 | 912 | /** |
ff1aa430 | 913 | * pci_msix_vec_count - return the number of device's MSI-X table entries |
a52e2e35 | 914 | * @dev: pointer to the pci_dev data structure of MSI-X device function |
ff1aa430 AG |
915 | * This function returns the number of device's MSI-X table entries and |
916 | * therefore the number of MSI-X vectors device is capable of sending. | |
917 | * It returns a negative errno if the device is not capable of sending MSI-X | |
918 | * interrupts. | |
919 | **/ | |
920 | int pci_msix_vec_count(struct pci_dev *dev) | |
a52e2e35 | 921 | { |
a52e2e35 RW |
922 | u16 control; |
923 | ||
520fe9dc | 924 | if (!dev->msix_cap) |
ff1aa430 | 925 | return -EINVAL; |
a52e2e35 | 926 | |
f84ecd28 | 927 | pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control); |
527eee29 | 928 | return msix_table_size(control); |
a52e2e35 | 929 | } |
ff1aa430 | 930 | EXPORT_SYMBOL(pci_msix_vec_count); |
a52e2e35 | 931 | |
1da177e4 LT |
932 | /** |
933 | * pci_enable_msix - configure device's MSI-X capability structure | |
934 | * @dev: pointer to the pci_dev data structure of MSI-X device function | |
70549ad9 | 935 | * @entries: pointer to an array of MSI-X entries |
1ce03373 | 936 | * @nvec: number of MSI-X irqs requested for allocation by device driver |
1da177e4 LT |
937 | * |
938 | * Setup the MSI-X capability structure of device function with the number | |
1ce03373 | 939 | * of requested irqs upon its software driver call to request for |
1da177e4 LT |
940 | * MSI-X mode enabled on its hardware device function. A return of zero |
941 | * indicates the successful configuration of MSI-X capability structure | |
1ce03373 | 942 | * with new allocated MSI-X irqs. A return of < 0 indicates a failure. |
1da177e4 | 943 | * Or a return of > 0 indicates that driver request is exceeding the number |
57fbf52c MT |
944 | * of irqs or MSI-X vectors available. Driver should use the returned value to |
945 | * re-send its request. | |
1da177e4 | 946 | **/ |
500559a9 | 947 | int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec) |
1da177e4 | 948 | { |
a52e2e35 | 949 | int status, nr_entries; |
ded86d8d | 950 | int i, j; |
1da177e4 | 951 | |
869a1615 | 952 | if (!entries || !dev->msix_cap || dev->current_state != PCI_D0) |
500559a9 | 953 | return -EINVAL; |
1da177e4 | 954 | |
c9953a73 ME |
955 | status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX); |
956 | if (status) | |
957 | return status; | |
958 | ||
ff1aa430 AG |
959 | nr_entries = pci_msix_vec_count(dev); |
960 | if (nr_entries < 0) | |
961 | return nr_entries; | |
1da177e4 | 962 | if (nvec > nr_entries) |
57fbf52c | 963 | return nr_entries; |
1da177e4 LT |
964 | |
965 | /* Check for any invalid entries */ | |
966 | for (i = 0; i < nvec; i++) { | |
967 | if (entries[i].entry >= nr_entries) | |
968 | return -EINVAL; /* invalid entry */ | |
969 | for (j = i + 1; j < nvec; j++) { | |
970 | if (entries[i].entry == entries[j].entry) | |
971 | return -EINVAL; /* duplicate entry */ | |
972 | } | |
973 | } | |
ded86d8d | 974 | WARN_ON(!!dev->msix_enabled); |
7bd007e4 | 975 | |
1ce03373 | 976 | /* Check whether driver already requested for MSI irq */ |
500559a9 | 977 | if (dev->msi_enabled) { |
227f0647 | 978 | dev_info(&dev->dev, "can't enable MSI-X (MSI IRQ already assigned)\n"); |
1da177e4 LT |
979 | return -EINVAL; |
980 | } | |
1da177e4 | 981 | status = msix_capability_init(dev, entries, nvec); |
1da177e4 LT |
982 | return status; |
983 | } | |
4cc086fa | 984 | EXPORT_SYMBOL(pci_enable_msix); |
1da177e4 | 985 | |
500559a9 | 986 | void pci_msix_shutdown(struct pci_dev *dev) |
fc4afc7b | 987 | { |
12abb8ba HS |
988 | struct msi_desc *entry; |
989 | ||
128bc5fc | 990 | if (!pci_msi_enable || !dev || !dev->msix_enabled) |
ded86d8d EB |
991 | return; |
992 | ||
12abb8ba HS |
993 | /* Return the device with MSI-X masked as initial states */ |
994 | list_for_each_entry(entry, &dev->msi_list, list) { | |
995 | /* Keep cached states to be restored */ | |
0e4ccb15 | 996 | arch_msix_mask_irq(entry, 1); |
12abb8ba HS |
997 | } |
998 | ||
66f0d0c4 | 999 | msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0); |
ba698ad4 | 1000 | pci_intx_for_msi(dev, 1); |
b1cbf4e4 | 1001 | dev->msix_enabled = 0; |
d52877c7 | 1002 | } |
c901851f | 1003 | |
500559a9 | 1004 | void pci_disable_msix(struct pci_dev *dev) |
d52877c7 YL |
1005 | { |
1006 | if (!pci_msi_enable || !dev || !dev->msix_enabled) | |
1007 | return; | |
1008 | ||
1009 | pci_msix_shutdown(dev); | |
f56e4481 | 1010 | free_msi_irqs(dev); |
1da177e4 | 1011 | } |
4cc086fa | 1012 | EXPORT_SYMBOL(pci_disable_msix); |
1da177e4 | 1013 | |
309e57df MW |
1014 | void pci_no_msi(void) |
1015 | { | |
1016 | pci_msi_enable = 0; | |
1017 | } | |
c9953a73 | 1018 | |
07ae95f9 AP |
1019 | /** |
1020 | * pci_msi_enabled - is MSI enabled? | |
1021 | * | |
1022 | * Returns true if MSI has not been disabled by the command-line option | |
1023 | * pci=nomsi. | |
1024 | **/ | |
1025 | int pci_msi_enabled(void) | |
d389fec6 | 1026 | { |
07ae95f9 | 1027 | return pci_msi_enable; |
d389fec6 | 1028 | } |
07ae95f9 | 1029 | EXPORT_SYMBOL(pci_msi_enabled); |
d389fec6 | 1030 | |
07ae95f9 | 1031 | void pci_msi_init_pci_dev(struct pci_dev *dev) |
d389fec6 | 1032 | { |
07ae95f9 | 1033 | INIT_LIST_HEAD(&dev->msi_list); |
d5dea7d9 EB |
1034 | |
1035 | /* Disable the msi hardware to avoid screaming interrupts | |
1036 | * during boot. This is the power on reset default so | |
1037 | * usually this should be a noop. | |
1038 | */ | |
e375b561 GS |
1039 | dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI); |
1040 | if (dev->msi_cap) | |
1041 | msi_set_enable(dev, 0); | |
1042 | ||
1043 | dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX); | |
1044 | if (dev->msix_cap) | |
66f0d0c4 | 1045 | msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0); |
d389fec6 | 1046 | } |
302a2523 AG |
1047 | |
1048 | /** | |
1049 | * pci_enable_msi_range - configure device's MSI capability structure | |
1050 | * @dev: device to configure | |
1051 | * @minvec: minimal number of interrupts to configure | |
1052 | * @maxvec: maximum number of interrupts to configure | |
1053 | * | |
1054 | * This function tries to allocate a maximum possible number of interrupts in a | |
1055 | * range between @minvec and @maxvec. It returns a negative errno if an error | |
1056 | * occurs. If it succeeds, it returns the actual number of interrupts allocated | |
1057 | * and updates the @dev's irq member to the lowest new interrupt number; | |
1058 | * the other interrupt numbers allocated to this device are consecutive. | |
1059 | **/ | |
1060 | int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) | |
1061 | { | |
034cd97e | 1062 | int nvec; |
302a2523 AG |
1063 | int rc; |
1064 | ||
034cd97e AG |
1065 | if (dev->current_state != PCI_D0) |
1066 | return -EINVAL; | |
1067 | ||
1068 | WARN_ON(!!dev->msi_enabled); | |
1069 | ||
1070 | /* Check whether driver already requested MSI-X irqs */ | |
1071 | if (dev->msix_enabled) { | |
1072 | dev_info(&dev->dev, | |
1073 | "can't enable MSI (MSI-X already enabled)\n"); | |
1074 | return -EINVAL; | |
1075 | } | |
1076 | ||
302a2523 AG |
1077 | if (maxvec < minvec) |
1078 | return -ERANGE; | |
1079 | ||
034cd97e AG |
1080 | nvec = pci_msi_vec_count(dev); |
1081 | if (nvec < 0) | |
1082 | return nvec; | |
1083 | else if (nvec < minvec) | |
1084 | return -EINVAL; | |
1085 | else if (nvec > maxvec) | |
1086 | nvec = maxvec; | |
1087 | ||
1088 | do { | |
1089 | rc = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI); | |
1090 | if (rc < 0) { | |
1091 | return rc; | |
1092 | } else if (rc > 0) { | |
1093 | if (rc < minvec) | |
1094 | return -ENOSPC; | |
1095 | nvec = rc; | |
1096 | } | |
1097 | } while (rc); | |
1098 | ||
302a2523 | 1099 | do { |
034cd97e | 1100 | rc = msi_capability_init(dev, nvec); |
302a2523 AG |
1101 | if (rc < 0) { |
1102 | return rc; | |
1103 | } else if (rc > 0) { | |
1104 | if (rc < minvec) | |
1105 | return -ENOSPC; | |
1106 | nvec = rc; | |
1107 | } | |
1108 | } while (rc); | |
1109 | ||
1110 | return nvec; | |
1111 | } | |
1112 | EXPORT_SYMBOL(pci_enable_msi_range); | |
1113 | ||
1114 | /** | |
1115 | * pci_enable_msix_range - configure device's MSI-X capability structure | |
1116 | * @dev: pointer to the pci_dev data structure of MSI-X device function | |
1117 | * @entries: pointer to an array of MSI-X entries | |
1118 | * @minvec: minimum number of MSI-X irqs requested | |
1119 | * @maxvec: maximum number of MSI-X irqs requested | |
1120 | * | |
1121 | * Setup the MSI-X capability structure of device function with a maximum | |
1122 | * possible number of interrupts in the range between @minvec and @maxvec | |
1123 | * upon its software driver call to request for MSI-X mode enabled on its | |
1124 | * hardware device function. It returns a negative errno if an error occurs. | |
1125 | * If it succeeds, it returns the actual number of interrupts allocated and | |
1126 | * indicates the successful configuration of MSI-X capability structure | |
1127 | * with new allocated MSI-X interrupts. | |
1128 | **/ | |
1129 | int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, | |
1130 | int minvec, int maxvec) | |
1131 | { | |
1132 | int nvec = maxvec; | |
1133 | int rc; | |
1134 | ||
1135 | if (maxvec < minvec) | |
1136 | return -ERANGE; | |
1137 | ||
1138 | do { | |
1139 | rc = pci_enable_msix(dev, entries, nvec); | |
1140 | if (rc < 0) { | |
1141 | return rc; | |
1142 | } else if (rc > 0) { | |
1143 | if (rc < minvec) | |
1144 | return -ENOSPC; | |
1145 | nvec = rc; | |
1146 | } | |
1147 | } while (rc); | |
1148 | ||
1149 | return nvec; | |
1150 | } | |
1151 | EXPORT_SYMBOL(pci_enable_msix_range); |