]>
Commit | Line | Data |
---|---|---|
30edc14b KRW |
1 | /* |
2 | * PCI Stub Driver - Grabs devices in backend to be exported later | |
3 | * | |
4 | * Ryan Wilson <hap9@epoch.ncsc.mil> | |
5 | * Chris Bookholt <hap10@epoch.ncsc.mil> | |
6 | */ | |
283c0972 JP |
7 | |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
9 | ||
30edc14b KRW |
10 | #include <linux/module.h> |
11 | #include <linux/init.h> | |
12 | #include <linux/rwsem.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/kref.h> | |
16 | #include <linux/pci.h> | |
17 | #include <linux/wait.h> | |
18 | #include <linux/sched.h> | |
8bfd4e02 | 19 | #include <linux/atomic.h> |
30edc14b KRW |
20 | #include <xen/events.h> |
21 | #include <asm/xen/pci.h> | |
22 | #include <asm/xen/hypervisor.h> | |
909b3fdb | 23 | #include <xen/interface/physdev.h> |
30edc14b KRW |
24 | #include "pciback.h" |
25 | #include "conf_space.h" | |
26 | #include "conf_space_quirks.h" | |
27 | ||
28 | static char *pci_devs_to_hide; | |
a92336a1 KRW |
29 | wait_queue_head_t xen_pcibk_aer_wait_queue; |
30 | /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops, | |
31 | * We want to avoid in middle of AER ops, xen_pcibk devices is being removed | |
30edc14b KRW |
32 | */ |
33 | static DECLARE_RWSEM(pcistub_sem); | |
34 | module_param_named(hide, pci_devs_to_hide, charp, 0444); | |
35 | ||
36 | struct pcistub_device_id { | |
37 | struct list_head slot_list; | |
38 | int domain; | |
39 | unsigned char bus; | |
40 | unsigned int devfn; | |
41 | }; | |
42 | static LIST_HEAD(pcistub_device_ids); | |
43 | static DEFINE_SPINLOCK(device_ids_lock); | |
44 | ||
45 | struct pcistub_device { | |
46 | struct kref kref; | |
47 | struct list_head dev_list; | |
48 | spinlock_t lock; | |
49 | ||
50 | struct pci_dev *dev; | |
a92336a1 | 51 | struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */ |
30edc14b KRW |
52 | }; |
53 | ||
54 | /* Access to pcistub_devices & seized_devices lists and the initialize_devices | |
55 | * flag must be locked with pcistub_devices_lock | |
56 | */ | |
57 | static DEFINE_SPINLOCK(pcistub_devices_lock); | |
58 | static LIST_HEAD(pcistub_devices); | |
59 | ||
60 | /* wait for device_initcall before initializing our devices | |
61 | * (see pcistub_init_devices_late) | |
62 | */ | |
63 | static int initialize_devices; | |
64 | static LIST_HEAD(seized_devices); | |
65 | ||
66 | static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev) | |
67 | { | |
68 | struct pcistub_device *psdev; | |
69 | ||
70 | dev_dbg(&dev->dev, "pcistub_device_alloc\n"); | |
71 | ||
72 | psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC); | |
73 | if (!psdev) | |
74 | return NULL; | |
75 | ||
76 | psdev->dev = pci_dev_get(dev); | |
77 | if (!psdev->dev) { | |
78 | kfree(psdev); | |
79 | return NULL; | |
80 | } | |
81 | ||
82 | kref_init(&psdev->kref); | |
83 | spin_lock_init(&psdev->lock); | |
84 | ||
85 | return psdev; | |
86 | } | |
87 | ||
88 | /* Don't call this directly as it's called by pcistub_device_put */ | |
89 | static void pcistub_device_release(struct kref *kref) | |
90 | { | |
91 | struct pcistub_device *psdev; | |
909b3fdb | 92 | struct pci_dev *dev; |
cd9db80e | 93 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
94 | |
95 | psdev = container_of(kref, struct pcistub_device, kref); | |
909b3fdb JB |
96 | dev = psdev->dev; |
97 | dev_data = pci_get_drvdata(dev); | |
30edc14b | 98 | |
909b3fdb | 99 | dev_dbg(&dev->dev, "pcistub_device_release\n"); |
30edc14b | 100 | |
909b3fdb | 101 | xen_unregister_device_domain_owner(dev); |
6221a9b2 | 102 | |
cd9db80e KRW |
103 | /* Call the reset function which does not take lock as this |
104 | * is called from "unbind" which takes a device_lock mutex. | |
105 | */ | |
909b3fdb JB |
106 | __pci_reset_function_locked(dev); |
107 | if (pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state)) | |
b1df4a56 | 108 | dev_info(&dev->dev, "Could not reload PCI state\n"); |
909b3fdb JB |
109 | else |
110 | pci_restore_state(dev); | |
111 | ||
d69c0e39 | 112 | if (dev->msix_cap) { |
909b3fdb JB |
113 | struct physdev_pci_device ppdev = { |
114 | .seg = pci_domain_nr(dev->bus), | |
115 | .bus = dev->bus->number, | |
116 | .devfn = dev->devfn | |
117 | }; | |
118 | int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix, | |
119 | &ppdev); | |
120 | ||
74beaf62 | 121 | if (err && err != -ENOSYS) |
909b3fdb JB |
122 | dev_warn(&dev->dev, "MSI-X release failed (%d)\n", |
123 | err); | |
124 | } | |
cd9db80e KRW |
125 | |
126 | /* Disable the device */ | |
909b3fdb | 127 | xen_pcibk_reset_device(dev); |
cd9db80e KRW |
128 | |
129 | kfree(dev_data); | |
909b3fdb | 130 | pci_set_drvdata(dev, NULL); |
cd9db80e KRW |
131 | |
132 | /* Clean-up the device */ | |
909b3fdb JB |
133 | xen_pcibk_config_free_dyn_fields(dev); |
134 | xen_pcibk_config_free_dev(dev); | |
30edc14b | 135 | |
be507fd0 | 136 | pci_clear_dev_assigned(dev); |
909b3fdb | 137 | pci_dev_put(dev); |
30edc14b KRW |
138 | |
139 | kfree(psdev); | |
140 | } | |
141 | ||
142 | static inline void pcistub_device_get(struct pcistub_device *psdev) | |
143 | { | |
144 | kref_get(&psdev->kref); | |
145 | } | |
146 | ||
147 | static inline void pcistub_device_put(struct pcistub_device *psdev) | |
148 | { | |
149 | kref_put(&psdev->kref, pcistub_device_release); | |
150 | } | |
151 | ||
1af916b7 JG |
152 | static struct pcistub_device *pcistub_device_find_locked(int domain, int bus, |
153 | int slot, int func) | |
30edc14b | 154 | { |
1af916b7 | 155 | struct pcistub_device *psdev; |
30edc14b KRW |
156 | |
157 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
158 | if (psdev->dev != NULL | |
159 | && domain == pci_domain_nr(psdev->dev->bus) | |
160 | && bus == psdev->dev->bus->number | |
b3e40b72 JB |
161 | && slot == PCI_SLOT(psdev->dev->devfn) |
162 | && func == PCI_FUNC(psdev->dev->devfn)) { | |
1af916b7 | 163 | return psdev; |
30edc14b KRW |
164 | } |
165 | } | |
166 | ||
1af916b7 JG |
167 | return NULL; |
168 | } | |
169 | ||
170 | static struct pcistub_device *pcistub_device_find(int domain, int bus, | |
171 | int slot, int func) | |
172 | { | |
173 | struct pcistub_device *psdev; | |
174 | unsigned long flags; | |
175 | ||
176 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
177 | ||
178 | psdev = pcistub_device_find_locked(domain, bus, slot, func); | |
179 | if (psdev) | |
180 | pcistub_device_get(psdev); | |
30edc14b | 181 | |
30edc14b KRW |
182 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
183 | return psdev; | |
184 | } | |
185 | ||
a92336a1 | 186 | static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev, |
30edc14b KRW |
187 | struct pcistub_device *psdev) |
188 | { | |
189 | struct pci_dev *pci_dev = NULL; | |
190 | unsigned long flags; | |
191 | ||
192 | pcistub_device_get(psdev); | |
193 | ||
194 | spin_lock_irqsave(&psdev->lock, flags); | |
195 | if (!psdev->pdev) { | |
196 | psdev->pdev = pdev; | |
197 | pci_dev = psdev->dev; | |
198 | } | |
199 | spin_unlock_irqrestore(&psdev->lock, flags); | |
200 | ||
201 | if (!pci_dev) | |
202 | pcistub_device_put(psdev); | |
203 | ||
204 | return pci_dev; | |
205 | } | |
206 | ||
a92336a1 | 207 | struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, |
30edc14b KRW |
208 | int domain, int bus, |
209 | int slot, int func) | |
210 | { | |
211 | struct pcistub_device *psdev; | |
212 | struct pci_dev *found_dev = NULL; | |
213 | unsigned long flags; | |
214 | ||
215 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
216 | ||
1af916b7 JG |
217 | psdev = pcistub_device_find_locked(domain, bus, slot, func); |
218 | if (psdev) | |
219 | found_dev = pcistub_device_get_pci_dev(pdev, psdev); | |
30edc14b KRW |
220 | |
221 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
222 | return found_dev; | |
223 | } | |
224 | ||
a92336a1 | 225 | struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev, |
30edc14b KRW |
226 | struct pci_dev *dev) |
227 | { | |
228 | struct pcistub_device *psdev; | |
229 | struct pci_dev *found_dev = NULL; | |
230 | unsigned long flags; | |
231 | ||
232 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
233 | ||
234 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
235 | if (psdev->dev == dev) { | |
236 | found_dev = pcistub_device_get_pci_dev(pdev, psdev); | |
237 | break; | |
238 | } | |
239 | } | |
240 | ||
241 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
242 | return found_dev; | |
243 | } | |
244 | ||
0a9fd015 KRW |
245 | /* |
246 | * Called when: | |
247 | * - XenBus state has been reconfigure (pci unplug). See xen_pcibk_remove_device | |
248 | * - XenBus state has been disconnected (guest shutdown). See xen_pcibk_xenbus_remove | |
249 | * - 'echo BDF > unbind' on pciback module with no guest attached. See pcistub_remove | |
250 | * - 'echo BDF > unbind' with a guest still using it. See pcistub_remove | |
251 | * | |
252 | * As such we have to be careful. | |
e8801a74 KRW |
253 | * |
254 | * To make this easier, the caller has to hold the device lock. | |
0a9fd015 | 255 | */ |
30edc14b KRW |
256 | void pcistub_put_pci_dev(struct pci_dev *dev) |
257 | { | |
258 | struct pcistub_device *psdev, *found_psdev = NULL; | |
259 | unsigned long flags; | |
b1df4a56 KRW |
260 | struct xen_pcibk_dev_data *dev_data; |
261 | int ret; | |
30edc14b KRW |
262 | |
263 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
264 | ||
265 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
266 | if (psdev->dev == dev) { | |
267 | found_psdev = psdev; | |
268 | break; | |
269 | } | |
270 | } | |
271 | ||
272 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
4645bf30 KRW |
273 | if (WARN_ON(!found_psdev)) |
274 | return; | |
30edc14b KRW |
275 | |
276 | /*hold this lock for avoiding breaking link between | |
a92336a1 | 277 | * pcistub and xen_pcibk when AER is in processing |
30edc14b KRW |
278 | */ |
279 | down_write(&pcistub_sem); | |
280 | /* Cleanup our device | |
281 | * (so it's ready for the next domain) | |
282 | */ | |
ac801022 | 283 | device_lock_assert(&dev->dev); |
e8801a74 | 284 | __pci_reset_function_locked(dev); |
cd9db80e | 285 | |
b1df4a56 KRW |
286 | dev_data = pci_get_drvdata(dev); |
287 | ret = pci_load_saved_state(dev, dev_data->pci_saved_state); | |
288 | if (!ret) { | |
289 | /* | |
290 | * The usual sequence is pci_save_state & pci_restore_state | |
291 | * but the guest might have messed the configuration space up. | |
292 | * Use the initial version (when device was bound to us). | |
293 | */ | |
294 | pci_restore_state(dev); | |
295 | } else | |
296 | dev_info(&dev->dev, "Could not reload PCI state\n"); | |
cd9db80e | 297 | /* This disables the device. */ |
8899035e | 298 | xen_pcibk_reset_device(dev); |
cd9db80e KRW |
299 | |
300 | /* And cleanup up our emulated fields. */ | |
8899035e | 301 | xen_pcibk_config_reset_dev(dev); |
fcb8ce96 | 302 | xen_pcibk_config_free_dyn_fields(dev); |
30edc14b | 303 | |
8899035e | 304 | xen_unregister_device_domain_owner(dev); |
31673558 | 305 | |
30edc14b KRW |
306 | spin_lock_irqsave(&found_psdev->lock, flags); |
307 | found_psdev->pdev = NULL; | |
308 | spin_unlock_irqrestore(&found_psdev->lock, flags); | |
309 | ||
310 | pcistub_device_put(found_psdev); | |
311 | up_write(&pcistub_sem); | |
312 | } | |
313 | ||
345a5255 GKH |
314 | static int pcistub_match_one(struct pci_dev *dev, |
315 | struct pcistub_device_id *pdev_id) | |
30edc14b KRW |
316 | { |
317 | /* Match the specified device by domain, bus, slot, func and also if | |
318 | * any of the device's parent bridges match. | |
319 | */ | |
320 | for (; dev != NULL; dev = dev->bus->self) { | |
321 | if (pci_domain_nr(dev->bus) == pdev_id->domain | |
322 | && dev->bus->number == pdev_id->bus | |
323 | && dev->devfn == pdev_id->devfn) | |
324 | return 1; | |
325 | ||
326 | /* Sometimes topmost bridge links to itself. */ | |
327 | if (dev == dev->bus->self) | |
328 | break; | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
345a5255 | 334 | static int pcistub_match(struct pci_dev *dev) |
30edc14b KRW |
335 | { |
336 | struct pcistub_device_id *pdev_id; | |
337 | unsigned long flags; | |
338 | int found = 0; | |
339 | ||
340 | spin_lock_irqsave(&device_ids_lock, flags); | |
341 | list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) { | |
342 | if (pcistub_match_one(dev, pdev_id)) { | |
343 | found = 1; | |
344 | break; | |
345 | } | |
346 | } | |
347 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
348 | ||
349 | return found; | |
350 | } | |
351 | ||
345a5255 | 352 | static int pcistub_init_device(struct pci_dev *dev) |
30edc14b | 353 | { |
a92336a1 | 354 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
355 | int err = 0; |
356 | ||
357 | dev_dbg(&dev->dev, "initializing...\n"); | |
358 | ||
359 | /* The PCI backend is not intended to be a module (or to work with | |
a92336a1 | 360 | * removable PCI devices (yet). If it were, xen_pcibk_config_free() |
30edc14b KRW |
361 | * would need to be called somewhere to free the memory allocated |
362 | * here and then to call kfree(pci_get_drvdata(psdev->dev)). | |
363 | */ | |
0513fe9e KRW |
364 | dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]") |
365 | + strlen(pci_name(dev)) + 1, GFP_ATOMIC); | |
30edc14b KRW |
366 | if (!dev_data) { |
367 | err = -ENOMEM; | |
368 | goto out; | |
369 | } | |
370 | pci_set_drvdata(dev, dev_data); | |
371 | ||
0513fe9e KRW |
372 | /* |
373 | * Setup name for fake IRQ handler. It will only be enabled | |
374 | * once the device is turned on by the guest. | |
375 | */ | |
376 | sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev)); | |
377 | ||
30edc14b KRW |
378 | dev_dbg(&dev->dev, "initializing config\n"); |
379 | ||
a92336a1 KRW |
380 | init_waitqueue_head(&xen_pcibk_aer_wait_queue); |
381 | err = xen_pcibk_config_init_dev(dev); | |
30edc14b KRW |
382 | if (err) |
383 | goto out; | |
384 | ||
385 | /* HACK: Force device (& ACPI) to determine what IRQ it's on - we | |
386 | * must do this here because pcibios_enable_device may specify | |
387 | * the pci device's true irq (and possibly its other resources) | |
388 | * if they differ from what's in the configuration space. | |
389 | * This makes the assumption that the device's resources won't | |
390 | * change after this point (otherwise this code may break!) | |
391 | */ | |
392 | dev_dbg(&dev->dev, "enabling device\n"); | |
393 | err = pci_enable_device(dev); | |
394 | if (err) | |
395 | goto config_release; | |
396 | ||
d69c0e39 | 397 | if (dev->msix_cap) { |
909b3fdb JB |
398 | struct physdev_pci_device ppdev = { |
399 | .seg = pci_domain_nr(dev->bus), | |
400 | .bus = dev->bus->number, | |
401 | .devfn = dev->devfn | |
402 | }; | |
403 | ||
404 | err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev); | |
74beaf62 | 405 | if (err && err != -ENOSYS) |
909b3fdb JB |
406 | dev_err(&dev->dev, "MSI-X preparation failed (%d)\n", |
407 | err); | |
408 | } | |
409 | ||
cd9db80e KRW |
410 | /* We need the device active to save the state. */ |
411 | dev_dbg(&dev->dev, "save state of device\n"); | |
412 | pci_save_state(dev); | |
413 | dev_data->pci_saved_state = pci_store_saved_state(dev); | |
414 | if (!dev_data->pci_saved_state) | |
415 | dev_err(&dev->dev, "Could not store PCI conf saved state!\n"); | |
80ba77df | 416 | else { |
744627e9 | 417 | dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n"); |
80ba77df | 418 | __pci_reset_function_locked(dev); |
c341ca45 | 419 | pci_restore_state(dev); |
80ba77df | 420 | } |
30edc14b KRW |
421 | /* Now disable the device (this also ensures some private device |
422 | * data is setup before we export) | |
423 | */ | |
424 | dev_dbg(&dev->dev, "reset device\n"); | |
a92336a1 | 425 | xen_pcibk_reset_device(dev); |
30edc14b | 426 | |
be507fd0 | 427 | pci_set_dev_assigned(dev); |
30edc14b KRW |
428 | return 0; |
429 | ||
430 | config_release: | |
a92336a1 | 431 | xen_pcibk_config_free_dev(dev); |
30edc14b KRW |
432 | |
433 | out: | |
434 | pci_set_drvdata(dev, NULL); | |
435 | kfree(dev_data); | |
436 | return err; | |
437 | } | |
438 | ||
439 | /* | |
440 | * Because some initialization still happens on | |
441 | * devices during fs_initcall, we need to defer | |
442 | * full initialization of our devices until | |
443 | * device_initcall. | |
444 | */ | |
445 | static int __init pcistub_init_devices_late(void) | |
446 | { | |
447 | struct pcistub_device *psdev; | |
448 | unsigned long flags; | |
449 | int err = 0; | |
450 | ||
30edc14b KRW |
451 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
452 | ||
453 | while (!list_empty(&seized_devices)) { | |
454 | psdev = container_of(seized_devices.next, | |
455 | struct pcistub_device, dev_list); | |
456 | list_del(&psdev->dev_list); | |
457 | ||
458 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
459 | ||
460 | err = pcistub_init_device(psdev->dev); | |
461 | if (err) { | |
462 | dev_err(&psdev->dev->dev, | |
463 | "error %d initializing device\n", err); | |
464 | kfree(psdev); | |
465 | psdev = NULL; | |
466 | } | |
467 | ||
468 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
469 | ||
470 | if (psdev) | |
471 | list_add_tail(&psdev->dev_list, &pcistub_devices); | |
472 | } | |
473 | ||
474 | initialize_devices = 1; | |
475 | ||
476 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
9f8bee9c JG |
481 | static void pcistub_device_id_add_list(struct pcistub_device_id *new, |
482 | int domain, int bus, unsigned int devfn) | |
483 | { | |
484 | struct pcistub_device_id *pci_dev_id; | |
485 | unsigned long flags; | |
486 | int found = 0; | |
487 | ||
488 | spin_lock_irqsave(&device_ids_lock, flags); | |
489 | ||
490 | list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { | |
491 | if (pci_dev_id->domain == domain && pci_dev_id->bus == bus && | |
492 | pci_dev_id->devfn == devfn) { | |
493 | found = 1; | |
494 | break; | |
495 | } | |
496 | } | |
497 | ||
498 | if (!found) { | |
499 | new->domain = domain; | |
500 | new->bus = bus; | |
501 | new->devfn = devfn; | |
502 | list_add_tail(&new->slot_list, &pcistub_device_ids); | |
503 | } | |
504 | ||
505 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
506 | ||
507 | if (found) | |
508 | kfree(new); | |
509 | } | |
510 | ||
345a5255 | 511 | static int pcistub_seize(struct pci_dev *dev) |
30edc14b KRW |
512 | { |
513 | struct pcistub_device *psdev; | |
514 | unsigned long flags; | |
515 | int err = 0; | |
516 | ||
517 | psdev = pcistub_device_alloc(dev); | |
518 | if (!psdev) | |
519 | return -ENOMEM; | |
520 | ||
521 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
522 | ||
523 | if (initialize_devices) { | |
524 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
525 | ||
526 | /* don't want irqs disabled when calling pcistub_init_device */ | |
527 | err = pcistub_init_device(psdev->dev); | |
528 | ||
529 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
530 | ||
531 | if (!err) | |
532 | list_add(&psdev->dev_list, &pcistub_devices); | |
533 | } else { | |
534 | dev_dbg(&dev->dev, "deferring initialization\n"); | |
535 | list_add(&psdev->dev_list, &seized_devices); | |
536 | } | |
537 | ||
538 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
539 | ||
540 | if (err) | |
541 | pcistub_device_put(psdev); | |
542 | ||
543 | return err; | |
544 | } | |
545 | ||
24d8bf1b KRW |
546 | /* Called when 'bind'. This means we must _NOT_ call pci_reset_function or |
547 | * other functions that take the sysfs lock. */ | |
345a5255 | 548 | static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id) |
30edc14b KRW |
549 | { |
550 | int err = 0; | |
551 | ||
552 | dev_dbg(&dev->dev, "probing...\n"); | |
553 | ||
554 | if (pcistub_match(dev)) { | |
555 | ||
556 | if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL | |
557 | && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { | |
558 | dev_err(&dev->dev, "can't export pci devices that " | |
559 | "don't have a normal (0) or bridge (1) " | |
560 | "header type!\n"); | |
561 | err = -ENODEV; | |
562 | goto out; | |
563 | } | |
564 | ||
565 | dev_info(&dev->dev, "seizing device\n"); | |
566 | err = pcistub_seize(dev); | |
567 | } else | |
568 | /* Didn't find the device */ | |
569 | err = -ENODEV; | |
570 | ||
571 | out: | |
572 | return err; | |
573 | } | |
574 | ||
24d8bf1b KRW |
575 | /* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or |
576 | * other functions that take the sysfs lock. */ | |
30edc14b KRW |
577 | static void pcistub_remove(struct pci_dev *dev) |
578 | { | |
579 | struct pcistub_device *psdev, *found_psdev = NULL; | |
580 | unsigned long flags; | |
581 | ||
582 | dev_dbg(&dev->dev, "removing\n"); | |
583 | ||
584 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
585 | ||
a92336a1 | 586 | xen_pcibk_config_quirk_release(dev); |
30edc14b KRW |
587 | |
588 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
589 | if (psdev->dev == dev) { | |
590 | found_psdev = psdev; | |
591 | break; | |
592 | } | |
593 | } | |
594 | ||
595 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
596 | ||
597 | if (found_psdev) { | |
b5d51214 KRW |
598 | dev_dbg(&dev->dev, "found device to remove %s\n", |
599 | found_psdev->pdev ? "- in-use" : ""); | |
30edc14b KRW |
600 | |
601 | if (found_psdev->pdev) { | |
b5d51214 KRW |
602 | int domid = xen_find_device_domain_owner(dev); |
603 | ||
604 | pr_warn("****** removing device %s while still in-use by domain %d! ******\n", | |
605 | pci_name(found_psdev->dev), domid); | |
283c0972 JP |
606 | pr_warn("****** driver domain may still access this device's i/o resources!\n"); |
607 | pr_warn("****** shutdown driver domain before binding device\n"); | |
608 | pr_warn("****** to other drivers or domains\n"); | |
30edc14b | 609 | |
8be9df6d KRW |
610 | /* N.B. This ends up calling pcistub_put_pci_dev which ends up |
611 | * doing the FLR. */ | |
a92336a1 | 612 | xen_pcibk_release_pci_dev(found_psdev->pdev, |
e8801a74 KRW |
613 | found_psdev->dev, |
614 | false /* caller holds the lock. */); | |
30edc14b KRW |
615 | } |
616 | ||
617 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
618 | list_del(&found_psdev->dev_list); | |
619 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
620 | ||
621 | /* the final put for releasing from the list */ | |
622 | pcistub_device_put(found_psdev); | |
623 | } | |
624 | } | |
625 | ||
9baa3c34 | 626 | static const struct pci_device_id pcistub_ids[] = { |
30edc14b KRW |
627 | { |
628 | .vendor = PCI_ANY_ID, | |
629 | .device = PCI_ANY_ID, | |
630 | .subvendor = PCI_ANY_ID, | |
631 | .subdevice = PCI_ANY_ID, | |
632 | }, | |
633 | {0,}, | |
634 | }; | |
635 | ||
636 | #define PCI_NODENAME_MAX 40 | |
637 | static void kill_domain_by_device(struct pcistub_device *psdev) | |
638 | { | |
639 | struct xenbus_transaction xbt; | |
640 | int err; | |
641 | char nodename[PCI_NODENAME_MAX]; | |
642 | ||
72bf809a | 643 | BUG_ON(!psdev); |
30edc14b KRW |
644 | snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0", |
645 | psdev->pdev->xdev->otherend_id); | |
30edc14b KRW |
646 | |
647 | again: | |
648 | err = xenbus_transaction_start(&xbt); | |
649 | if (err) { | |
650 | dev_err(&psdev->dev->dev, | |
651 | "error %d when start xenbus transaction\n", err); | |
652 | return; | |
653 | } | |
654 | /*PV AER handlers will set this flag*/ | |
655 | xenbus_printf(xbt, nodename, "aerState" , "aerfail"); | |
656 | err = xenbus_transaction_end(xbt, 0); | |
657 | if (err) { | |
658 | if (err == -EAGAIN) | |
659 | goto again; | |
660 | dev_err(&psdev->dev->dev, | |
661 | "error %d when end xenbus transaction\n", err); | |
662 | return; | |
663 | } | |
664 | } | |
665 | ||
666 | /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and | |
a92336a1 | 667 | * backend need to have cooperation. In xen_pcibk, those steps will do similar |
30edc14b KRW |
668 | * jobs: send service request and waiting for front_end response. |
669 | */ | |
670 | static pci_ers_result_t common_process(struct pcistub_device *psdev, | |
a92336a1 KRW |
671 | pci_channel_state_t state, int aer_cmd, |
672 | pci_ers_result_t result) | |
30edc14b KRW |
673 | { |
674 | pci_ers_result_t res = result; | |
675 | struct xen_pcie_aer_op *aer_op; | |
c1a04339 KRW |
676 | struct xen_pcibk_device *pdev = psdev->pdev; |
677 | struct xen_pci_sharedinfo *sh_info = pdev->sh_info; | |
30edc14b KRW |
678 | int ret; |
679 | ||
680 | /*with PV AER drivers*/ | |
c1a04339 | 681 | aer_op = &(sh_info->aer_op); |
30edc14b KRW |
682 | aer_op->cmd = aer_cmd ; |
683 | /*useful for error_detected callback*/ | |
684 | aer_op->err = state; | |
685 | /*pcifront_end BDF*/ | |
a92336a1 | 686 | ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev, |
30edc14b KRW |
687 | &aer_op->domain, &aer_op->bus, &aer_op->devfn); |
688 | if (!ret) { | |
689 | dev_err(&psdev->dev->dev, | |
a92336a1 | 690 | DRV_NAME ": failed to get pcifront device\n"); |
30edc14b KRW |
691 | return PCI_ERS_RESULT_NONE; |
692 | } | |
693 | wmb(); | |
694 | ||
695 | dev_dbg(&psdev->dev->dev, | |
a92336a1 | 696 | DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n", |
30edc14b | 697 | aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn); |
a92336a1 KRW |
698 | /*local flag to mark there's aer request, xen_pcibk callback will use |
699 | * this flag to judge whether we need to check pci-front give aer | |
700 | * service ack signal | |
30edc14b | 701 | */ |
c1a04339 | 702 | set_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); |
30edc14b KRW |
703 | |
704 | /*It is possible that a pcifront conf_read_write ops request invokes | |
705 | * the callback which cause the spurious execution of wake_up. | |
706 | * Yet it is harmless and better than a spinlock here | |
707 | */ | |
708 | set_bit(_XEN_PCIB_active, | |
c1a04339 | 709 | (unsigned long *)&sh_info->flags); |
30edc14b | 710 | wmb(); |
c1a04339 | 711 | notify_remote_via_irq(pdev->evtchn_irq); |
30edc14b | 712 | |
a92336a1 KRW |
713 | ret = wait_event_timeout(xen_pcibk_aer_wait_queue, |
714 | !(test_bit(_XEN_PCIB_active, (unsigned long *) | |
c1a04339 | 715 | &sh_info->flags)), 300*HZ); |
30edc14b KRW |
716 | |
717 | if (!ret) { | |
718 | if (test_bit(_XEN_PCIB_active, | |
c1a04339 | 719 | (unsigned long *)&sh_info->flags)) { |
30edc14b KRW |
720 | dev_err(&psdev->dev->dev, |
721 | "pcifront aer process not responding!\n"); | |
722 | clear_bit(_XEN_PCIB_active, | |
c1a04339 | 723 | (unsigned long *)&sh_info->flags); |
30edc14b KRW |
724 | aer_op->err = PCI_ERS_RESULT_NONE; |
725 | return res; | |
726 | } | |
727 | } | |
c1a04339 | 728 | clear_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); |
30edc14b KRW |
729 | |
730 | if (test_bit(_XEN_PCIF_active, | |
c1a04339 | 731 | (unsigned long *)&sh_info->flags)) { |
30edc14b | 732 | dev_dbg(&psdev->dev->dev, |
402c5e15 | 733 | "schedule pci_conf service in " DRV_NAME "\n"); |
a92336a1 | 734 | xen_pcibk_test_and_schedule_op(psdev->pdev); |
30edc14b KRW |
735 | } |
736 | ||
737 | res = (pci_ers_result_t)aer_op->err; | |
738 | return res; | |
739 | } | |
740 | ||
741 | /* | |
a92336a1 | 742 | * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case |
30edc14b KRW |
743 | * of the device driver could provide this service, and then wait for pcifront |
744 | * ack. | |
745 | * @dev: pointer to PCI devices | |
746 | * return value is used by aer_core do_recovery policy | |
747 | */ | |
a92336a1 | 748 | static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev) |
30edc14b KRW |
749 | { |
750 | struct pcistub_device *psdev; | |
751 | pci_ers_result_t result; | |
752 | ||
753 | result = PCI_ERS_RESULT_RECOVERED; | |
a92336a1 | 754 | dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n", |
30edc14b KRW |
755 | dev->bus->number, dev->devfn); |
756 | ||
757 | down_write(&pcistub_sem); | |
758 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
759 | dev->bus->number, | |
760 | PCI_SLOT(dev->devfn), | |
761 | PCI_FUNC(dev->devfn)); | |
762 | ||
763 | if (!psdev || !psdev->pdev) { | |
764 | dev_err(&dev->dev, | |
a92336a1 | 765 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
766 | goto end; |
767 | } | |
768 | ||
769 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 770 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
771 | " by HVM, kill it\n"); |
772 | kill_domain_by_device(psdev); | |
e6aa70a0 | 773 | goto end; |
30edc14b KRW |
774 | } |
775 | ||
776 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
777 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
778 | dev_err(&dev->dev, | |
779 | "guest with no AER driver should have been killed\n"); | |
e6aa70a0 | 780 | goto end; |
30edc14b KRW |
781 | } |
782 | result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result); | |
783 | ||
784 | if (result == PCI_ERS_RESULT_NONE || | |
785 | result == PCI_ERS_RESULT_DISCONNECT) { | |
786 | dev_dbg(&dev->dev, | |
787 | "No AER slot_reset service or disconnected!\n"); | |
788 | kill_domain_by_device(psdev); | |
789 | } | |
30edc14b | 790 | end: |
e6aa70a0 JB |
791 | if (psdev) |
792 | pcistub_device_put(psdev); | |
30edc14b KRW |
793 | up_write(&pcistub_sem); |
794 | return result; | |
795 | ||
796 | } | |
797 | ||
798 | ||
a92336a1 | 799 | /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront |
30edc14b KRW |
800 | * in case of the device driver could provide this service, and then wait |
801 | * for pcifront ack | |
802 | * @dev: pointer to PCI devices | |
803 | * return value is used by aer_core do_recovery policy | |
804 | */ | |
805 | ||
a92336a1 | 806 | static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev) |
30edc14b KRW |
807 | { |
808 | struct pcistub_device *psdev; | |
809 | pci_ers_result_t result; | |
810 | ||
811 | result = PCI_ERS_RESULT_RECOVERED; | |
a92336a1 | 812 | dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n", |
30edc14b KRW |
813 | dev->bus->number, dev->devfn); |
814 | ||
815 | down_write(&pcistub_sem); | |
816 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
817 | dev->bus->number, | |
818 | PCI_SLOT(dev->devfn), | |
819 | PCI_FUNC(dev->devfn)); | |
820 | ||
821 | if (!psdev || !psdev->pdev) { | |
822 | dev_err(&dev->dev, | |
a92336a1 | 823 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
824 | goto end; |
825 | } | |
826 | ||
827 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 828 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
829 | " by HVM, kill it\n"); |
830 | kill_domain_by_device(psdev); | |
e6aa70a0 | 831 | goto end; |
30edc14b KRW |
832 | } |
833 | ||
834 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
835 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
836 | dev_err(&dev->dev, | |
837 | "guest with no AER driver should have been killed\n"); | |
e6aa70a0 | 838 | goto end; |
30edc14b KRW |
839 | } |
840 | result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result); | |
841 | ||
842 | if (result == PCI_ERS_RESULT_NONE || | |
843 | result == PCI_ERS_RESULT_DISCONNECT) { | |
844 | dev_dbg(&dev->dev, | |
845 | "No AER mmio_enabled service or disconnected!\n"); | |
846 | kill_domain_by_device(psdev); | |
847 | } | |
30edc14b | 848 | end: |
e6aa70a0 JB |
849 | if (psdev) |
850 | pcistub_device_put(psdev); | |
30edc14b KRW |
851 | up_write(&pcistub_sem); |
852 | return result; | |
853 | } | |
854 | ||
a92336a1 | 855 | /*xen_pcibk_error_detected: it will send the error_detected request to pcifront |
30edc14b KRW |
856 | * in case of the device driver could provide this service, and then wait |
857 | * for pcifront ack. | |
858 | * @dev: pointer to PCI devices | |
859 | * @error: the current PCI connection state | |
860 | * return value is used by aer_core do_recovery policy | |
861 | */ | |
862 | ||
a92336a1 | 863 | static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev, |
30edc14b KRW |
864 | pci_channel_state_t error) |
865 | { | |
866 | struct pcistub_device *psdev; | |
867 | pci_ers_result_t result; | |
868 | ||
869 | result = PCI_ERS_RESULT_CAN_RECOVER; | |
a92336a1 | 870 | dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n", |
30edc14b KRW |
871 | dev->bus->number, dev->devfn); |
872 | ||
873 | down_write(&pcistub_sem); | |
874 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
875 | dev->bus->number, | |
876 | PCI_SLOT(dev->devfn), | |
877 | PCI_FUNC(dev->devfn)); | |
878 | ||
879 | if (!psdev || !psdev->pdev) { | |
880 | dev_err(&dev->dev, | |
a92336a1 | 881 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
882 | goto end; |
883 | } | |
884 | ||
885 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 886 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
887 | " by HVM, kill it\n"); |
888 | kill_domain_by_device(psdev); | |
e6aa70a0 | 889 | goto end; |
30edc14b KRW |
890 | } |
891 | ||
892 | /*Guest owns the device yet no aer handler regiested, kill guest*/ | |
893 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
894 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
895 | dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n"); | |
896 | kill_domain_by_device(psdev); | |
e6aa70a0 | 897 | goto end; |
30edc14b KRW |
898 | } |
899 | result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result); | |
900 | ||
901 | if (result == PCI_ERS_RESULT_NONE || | |
902 | result == PCI_ERS_RESULT_DISCONNECT) { | |
903 | dev_dbg(&dev->dev, | |
904 | "No AER error_detected service or disconnected!\n"); | |
905 | kill_domain_by_device(psdev); | |
906 | } | |
30edc14b | 907 | end: |
e6aa70a0 JB |
908 | if (psdev) |
909 | pcistub_device_put(psdev); | |
30edc14b KRW |
910 | up_write(&pcistub_sem); |
911 | return result; | |
912 | } | |
913 | ||
a92336a1 | 914 | /*xen_pcibk_error_resume: it will send the error_resume request to pcifront |
30edc14b KRW |
915 | * in case of the device driver could provide this service, and then wait |
916 | * for pcifront ack. | |
917 | * @dev: pointer to PCI devices | |
918 | */ | |
919 | ||
a92336a1 | 920 | static void xen_pcibk_error_resume(struct pci_dev *dev) |
30edc14b KRW |
921 | { |
922 | struct pcistub_device *psdev; | |
923 | ||
a92336a1 | 924 | dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n", |
30edc14b KRW |
925 | dev->bus->number, dev->devfn); |
926 | ||
927 | down_write(&pcistub_sem); | |
928 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
929 | dev->bus->number, | |
930 | PCI_SLOT(dev->devfn), | |
931 | PCI_FUNC(dev->devfn)); | |
932 | ||
933 | if (!psdev || !psdev->pdev) { | |
934 | dev_err(&dev->dev, | |
a92336a1 | 935 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
936 | goto end; |
937 | } | |
938 | ||
939 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 940 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
941 | " by HVM, kill it\n"); |
942 | kill_domain_by_device(psdev); | |
e6aa70a0 | 943 | goto end; |
30edc14b KRW |
944 | } |
945 | ||
946 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
947 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
948 | dev_err(&dev->dev, | |
949 | "guest with no AER driver should have been killed\n"); | |
950 | kill_domain_by_device(psdev); | |
e6aa70a0 | 951 | goto end; |
30edc14b KRW |
952 | } |
953 | common_process(psdev, 1, XEN_PCI_OP_aer_resume, | |
954 | PCI_ERS_RESULT_RECOVERED); | |
30edc14b | 955 | end: |
e6aa70a0 JB |
956 | if (psdev) |
957 | pcistub_device_put(psdev); | |
30edc14b KRW |
958 | up_write(&pcistub_sem); |
959 | return; | |
960 | } | |
961 | ||
a92336a1 | 962 | /*add xen_pcibk AER handling*/ |
1d352035 | 963 | static const struct pci_error_handlers xen_pcibk_error_handler = { |
a92336a1 KRW |
964 | .error_detected = xen_pcibk_error_detected, |
965 | .mmio_enabled = xen_pcibk_mmio_enabled, | |
966 | .slot_reset = xen_pcibk_slot_reset, | |
967 | .resume = xen_pcibk_error_resume, | |
30edc14b KRW |
968 | }; |
969 | ||
970 | /* | |
971 | * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't | |
972 | * for a normal device. I don't want it to be loaded automatically. | |
973 | */ | |
974 | ||
a92336a1 KRW |
975 | static struct pci_driver xen_pcibk_pci_driver = { |
976 | /* The name should be xen_pciback, but until the tools are updated | |
977 | * we will keep it as pciback. */ | |
978 | .name = "pciback", | |
30edc14b KRW |
979 | .id_table = pcistub_ids, |
980 | .probe = pcistub_probe, | |
981 | .remove = pcistub_remove, | |
a92336a1 | 982 | .err_handler = &xen_pcibk_error_handler, |
30edc14b KRW |
983 | }; |
984 | ||
985 | static inline int str_to_slot(const char *buf, int *domain, int *bus, | |
986 | int *slot, int *func) | |
987 | { | |
5b71fbdc | 988 | int parsed = 0; |
30edc14b | 989 | |
5b71fbdc JB |
990 | switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func, |
991 | &parsed)) { | |
c3cb4709 JB |
992 | case 3: |
993 | *func = -1; | |
5b71fbdc | 994 | sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed); |
c3cb4709 JB |
995 | break; |
996 | case 2: | |
997 | *slot = *func = -1; | |
5b71fbdc | 998 | sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed); |
c3cb4709 JB |
999 | break; |
1000 | } | |
5b71fbdc | 1001 | if (parsed && !buf[parsed]) |
30edc14b | 1002 | return 0; |
30edc14b KRW |
1003 | |
1004 | /* try again without domain */ | |
1005 | *domain = 0; | |
5b71fbdc | 1006 | switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) { |
c3cb4709 JB |
1007 | case 2: |
1008 | *func = -1; | |
5b71fbdc | 1009 | sscanf(buf, " %x:%x.* %n", bus, slot, &parsed); |
c3cb4709 JB |
1010 | break; |
1011 | case 1: | |
1012 | *slot = *func = -1; | |
5b71fbdc | 1013 | sscanf(buf, " %x:*.* %n", bus, &parsed); |
c3cb4709 JB |
1014 | break; |
1015 | } | |
5b71fbdc | 1016 | if (parsed && !buf[parsed]) |
30edc14b KRW |
1017 | return 0; |
1018 | ||
1019 | return -EINVAL; | |
1020 | } | |
1021 | ||
1022 | static inline int str_to_quirk(const char *buf, int *domain, int *bus, int | |
1023 | *slot, int *func, int *reg, int *size, int *mask) | |
1024 | { | |
5b71fbdc JB |
1025 | int parsed = 0; |
1026 | ||
b3e40b72 | 1027 | sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func, |
5b71fbdc JB |
1028 | reg, size, mask, &parsed); |
1029 | if (parsed && !buf[parsed]) | |
1030 | return 0; | |
30edc14b | 1031 | |
5b71fbdc JB |
1032 | /* try again without domain */ |
1033 | *domain = 0; | |
b3e40b72 | 1034 | sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size, |
5b71fbdc JB |
1035 | mask, &parsed); |
1036 | if (parsed && !buf[parsed]) | |
30edc14b | 1037 | return 0; |
5b71fbdc | 1038 | |
30edc14b KRW |
1039 | return -EINVAL; |
1040 | } | |
1041 | ||
1042 | static int pcistub_device_id_add(int domain, int bus, int slot, int func) | |
1043 | { | |
1044 | struct pcistub_device_id *pci_dev_id; | |
b3e40b72 | 1045 | int rc = 0, devfn = PCI_DEVFN(slot, func); |
c3cb4709 JB |
1046 | |
1047 | if (slot < 0) { | |
1048 | for (slot = 0; !rc && slot < 32; ++slot) | |
1049 | rc = pcistub_device_id_add(domain, bus, slot, func); | |
1050 | return rc; | |
1051 | } | |
1052 | ||
1053 | if (func < 0) { | |
1054 | for (func = 0; !rc && func < 8; ++func) | |
1055 | rc = pcistub_device_id_add(domain, bus, slot, func); | |
1056 | return rc; | |
1057 | } | |
30edc14b | 1058 | |
b3e40b72 JB |
1059 | if (( |
1060 | #if !defined(MODULE) /* pci_domains_supported is not being exported */ \ | |
1061 | || !defined(CONFIG_PCI_DOMAINS) | |
1062 | !pci_domains_supported ? domain : | |
1063 | #endif | |
1064 | domain < 0 || domain > 0xffff) | |
1065 | || bus < 0 || bus > 0xff | |
1066 | || PCI_SLOT(devfn) != slot | |
1067 | || PCI_FUNC(devfn) != func) | |
1068 | return -EINVAL; | |
1069 | ||
30edc14b KRW |
1070 | pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); |
1071 | if (!pci_dev_id) | |
1072 | return -ENOMEM; | |
1073 | ||
283c0972 | 1074 | pr_debug("wants to seize %04x:%02x:%02x.%d\n", |
30edc14b KRW |
1075 | domain, bus, slot, func); |
1076 | ||
9f8bee9c | 1077 | pcistub_device_id_add_list(pci_dev_id, domain, bus, devfn); |
30edc14b KRW |
1078 | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | static int pcistub_device_id_remove(int domain, int bus, int slot, int func) | |
1083 | { | |
1084 | struct pcistub_device_id *pci_dev_id, *t; | |
30edc14b KRW |
1085 | int err = -ENOENT; |
1086 | unsigned long flags; | |
1087 | ||
1088 | spin_lock_irqsave(&device_ids_lock, flags); | |
1089 | list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids, | |
1090 | slot_list) { | |
c3cb4709 JB |
1091 | if (pci_dev_id->domain == domain && pci_dev_id->bus == bus |
1092 | && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot) | |
1093 | && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) { | |
30edc14b KRW |
1094 | /* Don't break; here because it's possible the same |
1095 | * slot could be in the list more than once | |
1096 | */ | |
1097 | list_del(&pci_dev_id->slot_list); | |
1098 | kfree(pci_dev_id); | |
1099 | ||
1100 | err = 0; | |
1101 | ||
283c0972 JP |
1102 | pr_debug("removed %04x:%02x:%02x.%d from seize list\n", |
1103 | domain, bus, slot, func); | |
30edc14b KRW |
1104 | } |
1105 | } | |
1106 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1107 | ||
1108 | return err; | |
1109 | } | |
1110 | ||
b3e40b72 JB |
1111 | static int pcistub_reg_add(int domain, int bus, int slot, int func, |
1112 | unsigned int reg, unsigned int size, | |
1113 | unsigned int mask) | |
30edc14b KRW |
1114 | { |
1115 | int err = 0; | |
1116 | struct pcistub_device *psdev; | |
1117 | struct pci_dev *dev; | |
1118 | struct config_field *field; | |
1119 | ||
b3e40b72 JB |
1120 | if (reg > 0xfff || (size < 4 && (mask >> (size * 8)))) |
1121 | return -EINVAL; | |
1122 | ||
30edc14b | 1123 | psdev = pcistub_device_find(domain, bus, slot, func); |
e6aa70a0 | 1124 | if (!psdev) { |
30edc14b KRW |
1125 | err = -ENODEV; |
1126 | goto out; | |
1127 | } | |
1128 | dev = psdev->dev; | |
1129 | ||
1130 | field = kzalloc(sizeof(*field), GFP_ATOMIC); | |
1131 | if (!field) { | |
1132 | err = -ENOMEM; | |
1133 | goto out; | |
1134 | } | |
1135 | ||
1136 | field->offset = reg; | |
1137 | field->size = size; | |
1138 | field->mask = mask; | |
1139 | field->init = NULL; | |
1140 | field->reset = NULL; | |
1141 | field->release = NULL; | |
a92336a1 | 1142 | field->clean = xen_pcibk_config_field_free; |
30edc14b | 1143 | |
a92336a1 | 1144 | err = xen_pcibk_config_quirks_add_field(dev, field); |
30edc14b KRW |
1145 | if (err) |
1146 | kfree(field); | |
1147 | out: | |
e6aa70a0 JB |
1148 | if (psdev) |
1149 | pcistub_device_put(psdev); | |
30edc14b KRW |
1150 | return err; |
1151 | } | |
1152 | ||
1153 | static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf, | |
1154 | size_t count) | |
1155 | { | |
1156 | int domain, bus, slot, func; | |
1157 | int err; | |
1158 | ||
1159 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1160 | if (err) | |
1161 | goto out; | |
1162 | ||
1163 | err = pcistub_device_id_add(domain, bus, slot, func); | |
1164 | ||
1165 | out: | |
1166 | if (!err) | |
1167 | err = count; | |
1168 | return err; | |
1169 | } | |
402c5e15 | 1170 | static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add); |
30edc14b KRW |
1171 | |
1172 | static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf, | |
1173 | size_t count) | |
1174 | { | |
1175 | int domain, bus, slot, func; | |
1176 | int err; | |
1177 | ||
1178 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1179 | if (err) | |
1180 | goto out; | |
1181 | ||
1182 | err = pcistub_device_id_remove(domain, bus, slot, func); | |
1183 | ||
1184 | out: | |
1185 | if (!err) | |
1186 | err = count; | |
1187 | return err; | |
1188 | } | |
402c5e15 | 1189 | static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove); |
30edc14b KRW |
1190 | |
1191 | static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf) | |
1192 | { | |
1193 | struct pcistub_device_id *pci_dev_id; | |
1194 | size_t count = 0; | |
1195 | unsigned long flags; | |
1196 | ||
1197 | spin_lock_irqsave(&device_ids_lock, flags); | |
1198 | list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { | |
1199 | if (count >= PAGE_SIZE) | |
1200 | break; | |
1201 | ||
1202 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
e4de866a | 1203 | "%04x:%02x:%02x.%d\n", |
30edc14b KRW |
1204 | pci_dev_id->domain, pci_dev_id->bus, |
1205 | PCI_SLOT(pci_dev_id->devfn), | |
1206 | PCI_FUNC(pci_dev_id->devfn)); | |
1207 | } | |
1208 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1209 | ||
1210 | return count; | |
1211 | } | |
402c5e15 | 1212 | static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL); |
30edc14b | 1213 | |
0513fe9e KRW |
1214 | static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf) |
1215 | { | |
1216 | struct pcistub_device *psdev; | |
a92336a1 | 1217 | struct xen_pcibk_dev_data *dev_data; |
0513fe9e KRW |
1218 | size_t count = 0; |
1219 | unsigned long flags; | |
1220 | ||
1221 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1222 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1223 | if (count >= PAGE_SIZE) | |
1224 | break; | |
1225 | if (!psdev->dev) | |
1226 | continue; | |
1227 | dev_data = pci_get_drvdata(psdev->dev); | |
1228 | if (!dev_data) | |
1229 | continue; | |
1230 | count += | |
1231 | scnprintf(buf + count, PAGE_SIZE - count, | |
1232 | "%s:%s:%sing:%ld\n", | |
1233 | pci_name(psdev->dev), | |
1234 | dev_data->isr_on ? "on" : "off", | |
1235 | dev_data->ack_intr ? "ack" : "not ack", | |
1236 | dev_data->handled); | |
1237 | } | |
1238 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1239 | return count; | |
1240 | } | |
402c5e15 | 1241 | static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL); |
0513fe9e KRW |
1242 | |
1243 | static ssize_t pcistub_irq_handler_switch(struct device_driver *drv, | |
1244 | const char *buf, | |
1245 | size_t count) | |
1246 | { | |
1247 | struct pcistub_device *psdev; | |
a92336a1 | 1248 | struct xen_pcibk_dev_data *dev_data; |
0513fe9e | 1249 | int domain, bus, slot, func; |
405010df | 1250 | int err; |
0513fe9e KRW |
1251 | |
1252 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1253 | if (err) | |
e6aa70a0 | 1254 | return err; |
0513fe9e KRW |
1255 | |
1256 | psdev = pcistub_device_find(domain, bus, slot, func); | |
405010df WY |
1257 | if (!psdev) { |
1258 | err = -ENOENT; | |
0513fe9e | 1259 | goto out; |
405010df | 1260 | } |
0513fe9e KRW |
1261 | |
1262 | dev_data = pci_get_drvdata(psdev->dev); | |
405010df WY |
1263 | if (!dev_data) { |
1264 | err = -ENOENT; | |
0513fe9e | 1265 | goto out; |
405010df | 1266 | } |
0513fe9e KRW |
1267 | |
1268 | dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n", | |
1269 | dev_data->irq_name, dev_data->isr_on, | |
1270 | !dev_data->isr_on); | |
1271 | ||
1272 | dev_data->isr_on = !(dev_data->isr_on); | |
1273 | if (dev_data->isr_on) | |
1274 | dev_data->ack_intr = 1; | |
1275 | out: | |
e6aa70a0 JB |
1276 | if (psdev) |
1277 | pcistub_device_put(psdev); | |
0513fe9e KRW |
1278 | if (!err) |
1279 | err = count; | |
1280 | return err; | |
1281 | } | |
402c5e15 JB |
1282 | static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL, |
1283 | pcistub_irq_handler_switch); | |
0513fe9e | 1284 | |
30edc14b KRW |
1285 | static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf, |
1286 | size_t count) | |
1287 | { | |
1288 | int domain, bus, slot, func, reg, size, mask; | |
1289 | int err; | |
1290 | ||
1291 | err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size, | |
1292 | &mask); | |
1293 | if (err) | |
1294 | goto out; | |
1295 | ||
1296 | err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask); | |
1297 | ||
1298 | out: | |
1299 | if (!err) | |
1300 | err = count; | |
1301 | return err; | |
1302 | } | |
1303 | ||
1304 | static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf) | |
1305 | { | |
1306 | int count = 0; | |
1307 | unsigned long flags; | |
a92336a1 KRW |
1308 | struct xen_pcibk_config_quirk *quirk; |
1309 | struct xen_pcibk_dev_data *dev_data; | |
30edc14b KRW |
1310 | const struct config_field *field; |
1311 | const struct config_field_entry *cfg_entry; | |
1312 | ||
1313 | spin_lock_irqsave(&device_ids_lock, flags); | |
a92336a1 | 1314 | list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) { |
30edc14b KRW |
1315 | if (count >= PAGE_SIZE) |
1316 | goto out; | |
1317 | ||
1318 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1319 | "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n", | |
1320 | quirk->pdev->bus->number, | |
1321 | PCI_SLOT(quirk->pdev->devfn), | |
1322 | PCI_FUNC(quirk->pdev->devfn), | |
1323 | quirk->devid.vendor, quirk->devid.device, | |
1324 | quirk->devid.subvendor, | |
1325 | quirk->devid.subdevice); | |
1326 | ||
1327 | dev_data = pci_get_drvdata(quirk->pdev); | |
1328 | ||
1329 | list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { | |
1330 | field = cfg_entry->field; | |
1331 | if (count >= PAGE_SIZE) | |
1332 | goto out; | |
1333 | ||
1334 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1335 | "\t\t%08x:%01x:%08x\n", | |
1336 | cfg_entry->base_offset + | |
1337 | field->offset, field->size, | |
1338 | field->mask); | |
1339 | } | |
1340 | } | |
1341 | ||
1342 | out: | |
1343 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1344 | ||
1345 | return count; | |
1346 | } | |
402c5e15 JB |
1347 | static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show, |
1348 | pcistub_quirk_add); | |
30edc14b KRW |
1349 | |
1350 | static ssize_t permissive_add(struct device_driver *drv, const char *buf, | |
1351 | size_t count) | |
1352 | { | |
1353 | int domain, bus, slot, func; | |
1354 | int err; | |
1355 | struct pcistub_device *psdev; | |
a92336a1 | 1356 | struct xen_pcibk_dev_data *dev_data; |
b3e40b72 | 1357 | |
30edc14b KRW |
1358 | err = str_to_slot(buf, &domain, &bus, &slot, &func); |
1359 | if (err) | |
1360 | goto out; | |
b3e40b72 | 1361 | |
30edc14b KRW |
1362 | psdev = pcistub_device_find(domain, bus, slot, func); |
1363 | if (!psdev) { | |
1364 | err = -ENODEV; | |
1365 | goto out; | |
1366 | } | |
e6aa70a0 | 1367 | |
30edc14b KRW |
1368 | dev_data = pci_get_drvdata(psdev->dev); |
1369 | /* the driver data for a device should never be null at this point */ | |
1370 | if (!dev_data) { | |
1371 | err = -ENXIO; | |
1372 | goto release; | |
1373 | } | |
1374 | if (!dev_data->permissive) { | |
1375 | dev_data->permissive = 1; | |
1376 | /* Let user know that what they're doing could be unsafe */ | |
1377 | dev_warn(&psdev->dev->dev, "enabling permissive mode " | |
1378 | "configuration space accesses!\n"); | |
1379 | dev_warn(&psdev->dev->dev, | |
1380 | "permissive mode is potentially unsafe!\n"); | |
1381 | } | |
1382 | release: | |
1383 | pcistub_device_put(psdev); | |
1384 | out: | |
1385 | if (!err) | |
1386 | err = count; | |
1387 | return err; | |
1388 | } | |
1389 | ||
1390 | static ssize_t permissive_show(struct device_driver *drv, char *buf) | |
1391 | { | |
1392 | struct pcistub_device *psdev; | |
a92336a1 | 1393 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
1394 | size_t count = 0; |
1395 | unsigned long flags; | |
1396 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1397 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1398 | if (count >= PAGE_SIZE) | |
1399 | break; | |
1400 | if (!psdev->dev) | |
1401 | continue; | |
1402 | dev_data = pci_get_drvdata(psdev->dev); | |
1403 | if (!dev_data || !dev_data->permissive) | |
1404 | continue; | |
1405 | count += | |
1406 | scnprintf(buf + count, PAGE_SIZE - count, "%s\n", | |
1407 | pci_name(psdev->dev)); | |
1408 | } | |
1409 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1410 | return count; | |
1411 | } | |
402c5e15 JB |
1412 | static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, |
1413 | permissive_add); | |
30edc14b KRW |
1414 | |
1415 | static void pcistub_exit(void) | |
1416 | { | |
a92336a1 KRW |
1417 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot); |
1418 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
30edc14b | 1419 | &driver_attr_remove_slot); |
a92336a1 KRW |
1420 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots); |
1421 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks); | |
1422 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
1423 | &driver_attr_permissive); | |
1424 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
0513fe9e | 1425 | &driver_attr_irq_handlers); |
a92336a1 | 1426 | driver_remove_file(&xen_pcibk_pci_driver.driver, |
0513fe9e | 1427 | &driver_attr_irq_handler_state); |
a92336a1 | 1428 | pci_unregister_driver(&xen_pcibk_pci_driver); |
30edc14b KRW |
1429 | } |
1430 | ||
1431 | static int __init pcistub_init(void) | |
1432 | { | |
1433 | int pos = 0; | |
1434 | int err = 0; | |
1435 | int domain, bus, slot, func; | |
1436 | int parsed; | |
1437 | ||
1438 | if (pci_devs_to_hide && *pci_devs_to_hide) { | |
1439 | do { | |
1440 | parsed = 0; | |
1441 | ||
1442 | err = sscanf(pci_devs_to_hide + pos, | |
1443 | " (%x:%x:%x.%x) %n", | |
1444 | &domain, &bus, &slot, &func, &parsed); | |
c3cb4709 JB |
1445 | switch (err) { |
1446 | case 3: | |
1447 | func = -1; | |
5b71fbdc JB |
1448 | sscanf(pci_devs_to_hide + pos, |
1449 | " (%x:%x:%x.*) %n", | |
1450 | &domain, &bus, &slot, &parsed); | |
c3cb4709 JB |
1451 | break; |
1452 | case 2: | |
1453 | slot = func = -1; | |
5b71fbdc JB |
1454 | sscanf(pci_devs_to_hide + pos, |
1455 | " (%x:%x:*.*) %n", | |
1456 | &domain, &bus, &parsed); | |
c3cb4709 JB |
1457 | break; |
1458 | } | |
1459 | ||
5b71fbdc | 1460 | if (!parsed) { |
30edc14b KRW |
1461 | domain = 0; |
1462 | err = sscanf(pci_devs_to_hide + pos, | |
1463 | " (%x:%x.%x) %n", | |
1464 | &bus, &slot, &func, &parsed); | |
c3cb4709 JB |
1465 | switch (err) { |
1466 | case 2: | |
1467 | func = -1; | |
5b71fbdc JB |
1468 | sscanf(pci_devs_to_hide + pos, |
1469 | " (%x:%x.*) %n", | |
1470 | &bus, &slot, &parsed); | |
c3cb4709 JB |
1471 | break; |
1472 | case 1: | |
1473 | slot = func = -1; | |
5b71fbdc JB |
1474 | sscanf(pci_devs_to_hide + pos, |
1475 | " (%x:*.*) %n", | |
1476 | &bus, &parsed); | |
c3cb4709 JB |
1477 | break; |
1478 | } | |
30edc14b KRW |
1479 | } |
1480 | ||
5b71fbdc JB |
1481 | if (parsed <= 0) |
1482 | goto parse_error; | |
1483 | ||
30edc14b KRW |
1484 | err = pcistub_device_id_add(domain, bus, slot, func); |
1485 | if (err) | |
1486 | goto out; | |
1487 | ||
30edc14b | 1488 | pos += parsed; |
5b71fbdc | 1489 | } while (pci_devs_to_hide[pos]); |
30edc14b KRW |
1490 | } |
1491 | ||
1492 | /* If we're the first PCI Device Driver to register, we're the | |
1493 | * first one to get offered PCI devices as they become | |
1494 | * available (and thus we can be the first to grab them) | |
1495 | */ | |
a92336a1 | 1496 | err = pci_register_driver(&xen_pcibk_pci_driver); |
30edc14b KRW |
1497 | if (err < 0) |
1498 | goto out; | |
1499 | ||
a92336a1 | 1500 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1501 | &driver_attr_new_slot); |
1502 | if (!err) | |
a92336a1 | 1503 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1504 | &driver_attr_remove_slot); |
1505 | if (!err) | |
a92336a1 | 1506 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1507 | &driver_attr_slots); |
1508 | if (!err) | |
a92336a1 | 1509 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1510 | &driver_attr_quirks); |
1511 | if (!err) | |
a92336a1 | 1512 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1513 | &driver_attr_permissive); |
1514 | ||
0513fe9e | 1515 | if (!err) |
a92336a1 | 1516 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
0513fe9e KRW |
1517 | &driver_attr_irq_handlers); |
1518 | if (!err) | |
a92336a1 | 1519 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
0513fe9e | 1520 | &driver_attr_irq_handler_state); |
30edc14b KRW |
1521 | if (err) |
1522 | pcistub_exit(); | |
1523 | ||
1524 | out: | |
1525 | return err; | |
1526 | ||
1527 | parse_error: | |
283c0972 | 1528 | pr_err("Error parsing pci_devs_to_hide at \"%s\"\n", |
30edc14b KRW |
1529 | pci_devs_to_hide + pos); |
1530 | return -EINVAL; | |
1531 | } | |
1532 | ||
1533 | #ifndef MODULE | |
1534 | /* | |
1535 | * fs_initcall happens before device_initcall | |
a92336a1 | 1536 | * so xen_pcibk *should* get called first (b/c we |
30edc14b KRW |
1537 | * want to suck up any device before other drivers |
1538 | * get a chance by being the first pci device | |
1539 | * driver to register) | |
1540 | */ | |
1541 | fs_initcall(pcistub_init); | |
1542 | #endif | |
1543 | ||
6945c59c JB |
1544 | #ifdef CONFIG_PCI_IOV |
1545 | static struct pcistub_device *find_vfs(const struct pci_dev *pdev) | |
1546 | { | |
1547 | struct pcistub_device *psdev = NULL; | |
1548 | unsigned long flags; | |
1549 | bool found = false; | |
1550 | ||
1551 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1552 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1553 | if (!psdev->pdev && psdev->dev != pdev | |
1554 | && pci_physfn(psdev->dev) == pdev) { | |
1555 | found = true; | |
1556 | break; | |
1557 | } | |
1558 | } | |
1559 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1560 | if (found) | |
1561 | return psdev; | |
1562 | return NULL; | |
1563 | } | |
1564 | ||
1565 | static int pci_stub_notifier(struct notifier_block *nb, | |
1566 | unsigned long action, void *data) | |
1567 | { | |
1568 | struct device *dev = data; | |
1569 | const struct pci_dev *pdev = to_pci_dev(dev); | |
1570 | ||
1571 | if (action != BUS_NOTIFY_UNBIND_DRIVER) | |
1572 | return NOTIFY_DONE; | |
1573 | ||
1574 | if (!pdev->is_physfn) | |
1575 | return NOTIFY_DONE; | |
1576 | ||
1577 | for (;;) { | |
1578 | struct pcistub_device *psdev = find_vfs(pdev); | |
1579 | if (!psdev) | |
1580 | break; | |
1581 | device_release_driver(&psdev->dev->dev); | |
1582 | } | |
1583 | return NOTIFY_DONE; | |
1584 | } | |
1585 | ||
1586 | static struct notifier_block pci_stub_nb = { | |
1587 | .notifier_call = pci_stub_notifier, | |
1588 | }; | |
1589 | #endif | |
1590 | ||
a92336a1 | 1591 | static int __init xen_pcibk_init(void) |
30edc14b KRW |
1592 | { |
1593 | int err; | |
1594 | ||
1595 | if (!xen_initial_domain()) | |
1596 | return -ENODEV; | |
1597 | ||
a92336a1 | 1598 | err = xen_pcibk_config_init(); |
30edc14b KRW |
1599 | if (err) |
1600 | return err; | |
1601 | ||
1602 | #ifdef MODULE | |
1603 | err = pcistub_init(); | |
1604 | if (err < 0) | |
1605 | return err; | |
1606 | #endif | |
1607 | ||
1608 | pcistub_init_devices_late(); | |
a92336a1 | 1609 | err = xen_pcibk_xenbus_register(); |
30edc14b KRW |
1610 | if (err) |
1611 | pcistub_exit(); | |
6945c59c JB |
1612 | #ifdef CONFIG_PCI_IOV |
1613 | else | |
1614 | bus_register_notifier(&pci_bus_type, &pci_stub_nb); | |
1615 | #endif | |
30edc14b KRW |
1616 | |
1617 | return err; | |
1618 | } | |
1619 | ||
a92336a1 | 1620 | static void __exit xen_pcibk_cleanup(void) |
30edc14b | 1621 | { |
6945c59c JB |
1622 | #ifdef CONFIG_PCI_IOV |
1623 | bus_unregister_notifier(&pci_bus_type, &pci_stub_nb); | |
1624 | #endif | |
a92336a1 | 1625 | xen_pcibk_xenbus_unregister(); |
30edc14b KRW |
1626 | pcistub_exit(); |
1627 | } | |
1628 | ||
a92336a1 KRW |
1629 | module_init(xen_pcibk_init); |
1630 | module_exit(xen_pcibk_cleanup); | |
30edc14b KRW |
1631 | |
1632 | MODULE_LICENSE("Dual BSD/GPL"); | |
402c5e15 | 1633 | MODULE_ALIAS("xen-backend:pci"); |