]>
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 | ||
b057878b JG |
28 | #define PCISTUB_DRIVER_NAME "pciback" |
29 | ||
30edc14b | 30 | static char *pci_devs_to_hide; |
a92336a1 KRW |
31 | wait_queue_head_t xen_pcibk_aer_wait_queue; |
32 | /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops, | |
33 | * We want to avoid in middle of AER ops, xen_pcibk devices is being removed | |
30edc14b KRW |
34 | */ |
35 | static DECLARE_RWSEM(pcistub_sem); | |
36 | module_param_named(hide, pci_devs_to_hide, charp, 0444); | |
37 | ||
38 | struct pcistub_device_id { | |
39 | struct list_head slot_list; | |
40 | int domain; | |
41 | unsigned char bus; | |
42 | unsigned int devfn; | |
43 | }; | |
44 | static LIST_HEAD(pcistub_device_ids); | |
45 | static DEFINE_SPINLOCK(device_ids_lock); | |
46 | ||
47 | struct pcistub_device { | |
48 | struct kref kref; | |
49 | struct list_head dev_list; | |
50 | spinlock_t lock; | |
51 | ||
52 | struct pci_dev *dev; | |
a92336a1 | 53 | struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */ |
30edc14b KRW |
54 | }; |
55 | ||
56 | /* Access to pcistub_devices & seized_devices lists and the initialize_devices | |
57 | * flag must be locked with pcistub_devices_lock | |
58 | */ | |
59 | static DEFINE_SPINLOCK(pcistub_devices_lock); | |
60 | static LIST_HEAD(pcistub_devices); | |
61 | ||
62 | /* wait for device_initcall before initializing our devices | |
63 | * (see pcistub_init_devices_late) | |
64 | */ | |
65 | static int initialize_devices; | |
66 | static LIST_HEAD(seized_devices); | |
67 | ||
68 | static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev) | |
69 | { | |
70 | struct pcistub_device *psdev; | |
71 | ||
72 | dev_dbg(&dev->dev, "pcistub_device_alloc\n"); | |
73 | ||
74 | psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC); | |
75 | if (!psdev) | |
76 | return NULL; | |
77 | ||
78 | psdev->dev = pci_dev_get(dev); | |
79 | if (!psdev->dev) { | |
80 | kfree(psdev); | |
81 | return NULL; | |
82 | } | |
83 | ||
84 | kref_init(&psdev->kref); | |
85 | spin_lock_init(&psdev->lock); | |
86 | ||
87 | return psdev; | |
88 | } | |
89 | ||
90 | /* Don't call this directly as it's called by pcistub_device_put */ | |
91 | static void pcistub_device_release(struct kref *kref) | |
92 | { | |
93 | struct pcistub_device *psdev; | |
909b3fdb | 94 | struct pci_dev *dev; |
cd9db80e | 95 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
96 | |
97 | psdev = container_of(kref, struct pcistub_device, kref); | |
909b3fdb JB |
98 | dev = psdev->dev; |
99 | dev_data = pci_get_drvdata(dev); | |
30edc14b | 100 | |
909b3fdb | 101 | dev_dbg(&dev->dev, "pcistub_device_release\n"); |
30edc14b | 102 | |
909b3fdb | 103 | xen_unregister_device_domain_owner(dev); |
6221a9b2 | 104 | |
cd9db80e KRW |
105 | /* Call the reset function which does not take lock as this |
106 | * is called from "unbind" which takes a device_lock mutex. | |
107 | */ | |
909b3fdb | 108 | __pci_reset_function_locked(dev); |
e6622b64 RL |
109 | if (dev_data && |
110 | pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state)) | |
b1df4a56 | 111 | dev_info(&dev->dev, "Could not reload PCI state\n"); |
909b3fdb JB |
112 | else |
113 | pci_restore_state(dev); | |
114 | ||
d69c0e39 | 115 | if (dev->msix_cap) { |
909b3fdb JB |
116 | struct physdev_pci_device ppdev = { |
117 | .seg = pci_domain_nr(dev->bus), | |
118 | .bus = dev->bus->number, | |
119 | .devfn = dev->devfn | |
120 | }; | |
121 | int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix, | |
122 | &ppdev); | |
123 | ||
74beaf62 | 124 | if (err && err != -ENOSYS) |
909b3fdb JB |
125 | dev_warn(&dev->dev, "MSI-X release failed (%d)\n", |
126 | err); | |
127 | } | |
cd9db80e KRW |
128 | |
129 | /* Disable the device */ | |
909b3fdb | 130 | xen_pcibk_reset_device(dev); |
cd9db80e KRW |
131 | |
132 | kfree(dev_data); | |
909b3fdb | 133 | pci_set_drvdata(dev, NULL); |
cd9db80e KRW |
134 | |
135 | /* Clean-up the device */ | |
909b3fdb JB |
136 | xen_pcibk_config_free_dyn_fields(dev); |
137 | xen_pcibk_config_free_dev(dev); | |
30edc14b | 138 | |
be507fd0 | 139 | pci_clear_dev_assigned(dev); |
909b3fdb | 140 | pci_dev_put(dev); |
30edc14b KRW |
141 | |
142 | kfree(psdev); | |
143 | } | |
144 | ||
145 | static inline void pcistub_device_get(struct pcistub_device *psdev) | |
146 | { | |
147 | kref_get(&psdev->kref); | |
148 | } | |
149 | ||
150 | static inline void pcistub_device_put(struct pcistub_device *psdev) | |
151 | { | |
152 | kref_put(&psdev->kref, pcistub_device_release); | |
153 | } | |
154 | ||
1af916b7 JG |
155 | static struct pcistub_device *pcistub_device_find_locked(int domain, int bus, |
156 | int slot, int func) | |
30edc14b | 157 | { |
1af916b7 | 158 | struct pcistub_device *psdev; |
30edc14b KRW |
159 | |
160 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
161 | if (psdev->dev != NULL | |
162 | && domain == pci_domain_nr(psdev->dev->bus) | |
163 | && bus == psdev->dev->bus->number | |
b3e40b72 JB |
164 | && slot == PCI_SLOT(psdev->dev->devfn) |
165 | && func == PCI_FUNC(psdev->dev->devfn)) { | |
1af916b7 | 166 | return psdev; |
30edc14b KRW |
167 | } |
168 | } | |
169 | ||
1af916b7 JG |
170 | return NULL; |
171 | } | |
172 | ||
173 | static struct pcistub_device *pcistub_device_find(int domain, int bus, | |
174 | int slot, int func) | |
175 | { | |
176 | struct pcistub_device *psdev; | |
177 | unsigned long flags; | |
178 | ||
179 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
180 | ||
181 | psdev = pcistub_device_find_locked(domain, bus, slot, func); | |
182 | if (psdev) | |
183 | pcistub_device_get(psdev); | |
30edc14b | 184 | |
30edc14b KRW |
185 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
186 | return psdev; | |
187 | } | |
188 | ||
a92336a1 | 189 | static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev, |
30edc14b KRW |
190 | struct pcistub_device *psdev) |
191 | { | |
192 | struct pci_dev *pci_dev = NULL; | |
193 | unsigned long flags; | |
194 | ||
195 | pcistub_device_get(psdev); | |
196 | ||
197 | spin_lock_irqsave(&psdev->lock, flags); | |
198 | if (!psdev->pdev) { | |
199 | psdev->pdev = pdev; | |
200 | pci_dev = psdev->dev; | |
201 | } | |
202 | spin_unlock_irqrestore(&psdev->lock, flags); | |
203 | ||
204 | if (!pci_dev) | |
205 | pcistub_device_put(psdev); | |
206 | ||
207 | return pci_dev; | |
208 | } | |
209 | ||
a92336a1 | 210 | struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, |
30edc14b KRW |
211 | int domain, int bus, |
212 | int slot, int func) | |
213 | { | |
214 | struct pcistub_device *psdev; | |
215 | struct pci_dev *found_dev = NULL; | |
216 | unsigned long flags; | |
217 | ||
218 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
219 | ||
1af916b7 JG |
220 | psdev = pcistub_device_find_locked(domain, bus, slot, func); |
221 | if (psdev) | |
222 | found_dev = pcistub_device_get_pci_dev(pdev, psdev); | |
30edc14b KRW |
223 | |
224 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
225 | return found_dev; | |
226 | } | |
227 | ||
a92336a1 | 228 | struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev, |
30edc14b KRW |
229 | struct pci_dev *dev) |
230 | { | |
231 | struct pcistub_device *psdev; | |
232 | struct pci_dev *found_dev = NULL; | |
233 | unsigned long flags; | |
234 | ||
235 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
236 | ||
237 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
238 | if (psdev->dev == dev) { | |
239 | found_dev = pcistub_device_get_pci_dev(pdev, psdev); | |
240 | break; | |
241 | } | |
242 | } | |
243 | ||
244 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
245 | return found_dev; | |
246 | } | |
247 | ||
0a9fd015 KRW |
248 | /* |
249 | * Called when: | |
250 | * - XenBus state has been reconfigure (pci unplug). See xen_pcibk_remove_device | |
251 | * - XenBus state has been disconnected (guest shutdown). See xen_pcibk_xenbus_remove | |
252 | * - 'echo BDF > unbind' on pciback module with no guest attached. See pcistub_remove | |
253 | * - 'echo BDF > unbind' with a guest still using it. See pcistub_remove | |
254 | * | |
255 | * As such we have to be careful. | |
e8801a74 KRW |
256 | * |
257 | * To make this easier, the caller has to hold the device lock. | |
0a9fd015 | 258 | */ |
30edc14b KRW |
259 | void pcistub_put_pci_dev(struct pci_dev *dev) |
260 | { | |
261 | struct pcistub_device *psdev, *found_psdev = NULL; | |
262 | unsigned long flags; | |
b1df4a56 KRW |
263 | struct xen_pcibk_dev_data *dev_data; |
264 | int ret; | |
30edc14b KRW |
265 | |
266 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
267 | ||
268 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
269 | if (psdev->dev == dev) { | |
270 | found_psdev = psdev; | |
271 | break; | |
272 | } | |
273 | } | |
274 | ||
275 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
4645bf30 KRW |
276 | if (WARN_ON(!found_psdev)) |
277 | return; | |
30edc14b KRW |
278 | |
279 | /*hold this lock for avoiding breaking link between | |
a92336a1 | 280 | * pcistub and xen_pcibk when AER is in processing |
30edc14b KRW |
281 | */ |
282 | down_write(&pcistub_sem); | |
283 | /* Cleanup our device | |
284 | * (so it's ready for the next domain) | |
285 | */ | |
ac801022 | 286 | device_lock_assert(&dev->dev); |
e8801a74 | 287 | __pci_reset_function_locked(dev); |
cd9db80e | 288 | |
b1df4a56 KRW |
289 | dev_data = pci_get_drvdata(dev); |
290 | ret = pci_load_saved_state(dev, dev_data->pci_saved_state); | |
291 | if (!ret) { | |
292 | /* | |
293 | * The usual sequence is pci_save_state & pci_restore_state | |
294 | * but the guest might have messed the configuration space up. | |
295 | * Use the initial version (when device was bound to us). | |
296 | */ | |
297 | pci_restore_state(dev); | |
298 | } else | |
299 | dev_info(&dev->dev, "Could not reload PCI state\n"); | |
cd9db80e | 300 | /* This disables the device. */ |
8899035e | 301 | xen_pcibk_reset_device(dev); |
cd9db80e KRW |
302 | |
303 | /* And cleanup up our emulated fields. */ | |
8899035e | 304 | xen_pcibk_config_reset_dev(dev); |
fcb8ce96 | 305 | xen_pcibk_config_free_dyn_fields(dev); |
30edc14b | 306 | |
8899035e | 307 | xen_unregister_device_domain_owner(dev); |
31673558 | 308 | |
30edc14b KRW |
309 | spin_lock_irqsave(&found_psdev->lock, flags); |
310 | found_psdev->pdev = NULL; | |
311 | spin_unlock_irqrestore(&found_psdev->lock, flags); | |
312 | ||
313 | pcistub_device_put(found_psdev); | |
314 | up_write(&pcistub_sem); | |
315 | } | |
316 | ||
345a5255 GKH |
317 | static int pcistub_match_one(struct pci_dev *dev, |
318 | struct pcistub_device_id *pdev_id) | |
30edc14b KRW |
319 | { |
320 | /* Match the specified device by domain, bus, slot, func and also if | |
321 | * any of the device's parent bridges match. | |
322 | */ | |
323 | for (; dev != NULL; dev = dev->bus->self) { | |
324 | if (pci_domain_nr(dev->bus) == pdev_id->domain | |
325 | && dev->bus->number == pdev_id->bus | |
326 | && dev->devfn == pdev_id->devfn) | |
327 | return 1; | |
328 | ||
329 | /* Sometimes topmost bridge links to itself. */ | |
330 | if (dev == dev->bus->self) | |
331 | break; | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
345a5255 | 337 | static int pcistub_match(struct pci_dev *dev) |
30edc14b KRW |
338 | { |
339 | struct pcistub_device_id *pdev_id; | |
340 | unsigned long flags; | |
341 | int found = 0; | |
342 | ||
343 | spin_lock_irqsave(&device_ids_lock, flags); | |
344 | list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) { | |
345 | if (pcistub_match_one(dev, pdev_id)) { | |
346 | found = 1; | |
347 | break; | |
348 | } | |
349 | } | |
350 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
351 | ||
352 | return found; | |
353 | } | |
354 | ||
345a5255 | 355 | static int pcistub_init_device(struct pci_dev *dev) |
30edc14b | 356 | { |
a92336a1 | 357 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
358 | int err = 0; |
359 | ||
360 | dev_dbg(&dev->dev, "initializing...\n"); | |
361 | ||
362 | /* The PCI backend is not intended to be a module (or to work with | |
a92336a1 | 363 | * removable PCI devices (yet). If it were, xen_pcibk_config_free() |
30edc14b KRW |
364 | * would need to be called somewhere to free the memory allocated |
365 | * here and then to call kfree(pci_get_drvdata(psdev->dev)). | |
366 | */ | |
0513fe9e KRW |
367 | dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]") |
368 | + strlen(pci_name(dev)) + 1, GFP_ATOMIC); | |
30edc14b KRW |
369 | if (!dev_data) { |
370 | err = -ENOMEM; | |
371 | goto out; | |
372 | } | |
373 | pci_set_drvdata(dev, dev_data); | |
374 | ||
0513fe9e KRW |
375 | /* |
376 | * Setup name for fake IRQ handler. It will only be enabled | |
377 | * once the device is turned on by the guest. | |
378 | */ | |
379 | sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev)); | |
380 | ||
30edc14b KRW |
381 | dev_dbg(&dev->dev, "initializing config\n"); |
382 | ||
a92336a1 KRW |
383 | init_waitqueue_head(&xen_pcibk_aer_wait_queue); |
384 | err = xen_pcibk_config_init_dev(dev); | |
30edc14b KRW |
385 | if (err) |
386 | goto out; | |
387 | ||
388 | /* HACK: Force device (& ACPI) to determine what IRQ it's on - we | |
389 | * must do this here because pcibios_enable_device may specify | |
390 | * the pci device's true irq (and possibly its other resources) | |
391 | * if they differ from what's in the configuration space. | |
392 | * This makes the assumption that the device's resources won't | |
393 | * change after this point (otherwise this code may break!) | |
394 | */ | |
395 | dev_dbg(&dev->dev, "enabling device\n"); | |
396 | err = pci_enable_device(dev); | |
397 | if (err) | |
398 | goto config_release; | |
399 | ||
d69c0e39 | 400 | if (dev->msix_cap) { |
909b3fdb JB |
401 | struct physdev_pci_device ppdev = { |
402 | .seg = pci_domain_nr(dev->bus), | |
403 | .bus = dev->bus->number, | |
404 | .devfn = dev->devfn | |
405 | }; | |
406 | ||
407 | err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev); | |
74beaf62 | 408 | if (err && err != -ENOSYS) |
909b3fdb JB |
409 | dev_err(&dev->dev, "MSI-X preparation failed (%d)\n", |
410 | err); | |
411 | } | |
412 | ||
cd9db80e KRW |
413 | /* We need the device active to save the state. */ |
414 | dev_dbg(&dev->dev, "save state of device\n"); | |
415 | pci_save_state(dev); | |
416 | dev_data->pci_saved_state = pci_store_saved_state(dev); | |
417 | if (!dev_data->pci_saved_state) | |
418 | dev_err(&dev->dev, "Could not store PCI conf saved state!\n"); | |
80ba77df | 419 | else { |
744627e9 | 420 | dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n"); |
80ba77df | 421 | __pci_reset_function_locked(dev); |
c341ca45 | 422 | pci_restore_state(dev); |
80ba77df | 423 | } |
30edc14b KRW |
424 | /* Now disable the device (this also ensures some private device |
425 | * data is setup before we export) | |
426 | */ | |
427 | dev_dbg(&dev->dev, "reset device\n"); | |
a92336a1 | 428 | xen_pcibk_reset_device(dev); |
30edc14b | 429 | |
be507fd0 | 430 | pci_set_dev_assigned(dev); |
30edc14b KRW |
431 | return 0; |
432 | ||
433 | config_release: | |
a92336a1 | 434 | xen_pcibk_config_free_dev(dev); |
30edc14b KRW |
435 | |
436 | out: | |
437 | pci_set_drvdata(dev, NULL); | |
438 | kfree(dev_data); | |
439 | return err; | |
440 | } | |
441 | ||
442 | /* | |
443 | * Because some initialization still happens on | |
444 | * devices during fs_initcall, we need to defer | |
445 | * full initialization of our devices until | |
446 | * device_initcall. | |
447 | */ | |
448 | static int __init pcistub_init_devices_late(void) | |
449 | { | |
450 | struct pcistub_device *psdev; | |
451 | unsigned long flags; | |
452 | int err = 0; | |
453 | ||
30edc14b KRW |
454 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
455 | ||
456 | while (!list_empty(&seized_devices)) { | |
457 | psdev = container_of(seized_devices.next, | |
458 | struct pcistub_device, dev_list); | |
459 | list_del(&psdev->dev_list); | |
460 | ||
461 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
462 | ||
463 | err = pcistub_init_device(psdev->dev); | |
464 | if (err) { | |
465 | dev_err(&psdev->dev->dev, | |
466 | "error %d initializing device\n", err); | |
467 | kfree(psdev); | |
468 | psdev = NULL; | |
469 | } | |
470 | ||
471 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
472 | ||
473 | if (psdev) | |
474 | list_add_tail(&psdev->dev_list, &pcistub_devices); | |
475 | } | |
476 | ||
477 | initialize_devices = 1; | |
478 | ||
479 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
9f8bee9c JG |
484 | static void pcistub_device_id_add_list(struct pcistub_device_id *new, |
485 | int domain, int bus, unsigned int devfn) | |
486 | { | |
487 | struct pcistub_device_id *pci_dev_id; | |
488 | unsigned long flags; | |
489 | int found = 0; | |
490 | ||
491 | spin_lock_irqsave(&device_ids_lock, flags); | |
492 | ||
493 | list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { | |
494 | if (pci_dev_id->domain == domain && pci_dev_id->bus == bus && | |
495 | pci_dev_id->devfn == devfn) { | |
496 | found = 1; | |
497 | break; | |
498 | } | |
499 | } | |
500 | ||
501 | if (!found) { | |
502 | new->domain = domain; | |
503 | new->bus = bus; | |
504 | new->devfn = devfn; | |
505 | list_add_tail(&new->slot_list, &pcistub_device_ids); | |
506 | } | |
507 | ||
508 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
509 | ||
510 | if (found) | |
511 | kfree(new); | |
512 | } | |
513 | ||
b057878b JG |
514 | static int pcistub_seize(struct pci_dev *dev, |
515 | struct pcistub_device_id *pci_dev_id) | |
30edc14b KRW |
516 | { |
517 | struct pcistub_device *psdev; | |
518 | unsigned long flags; | |
519 | int err = 0; | |
520 | ||
521 | psdev = pcistub_device_alloc(dev); | |
b057878b JG |
522 | if (!psdev) { |
523 | kfree(pci_dev_id); | |
30edc14b | 524 | return -ENOMEM; |
b057878b | 525 | } |
30edc14b KRW |
526 | |
527 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
528 | ||
529 | if (initialize_devices) { | |
530 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
531 | ||
532 | /* don't want irqs disabled when calling pcistub_init_device */ | |
533 | err = pcistub_init_device(psdev->dev); | |
534 | ||
535 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
536 | ||
537 | if (!err) | |
538 | list_add(&psdev->dev_list, &pcistub_devices); | |
539 | } else { | |
540 | dev_dbg(&dev->dev, "deferring initialization\n"); | |
541 | list_add(&psdev->dev_list, &seized_devices); | |
542 | } | |
543 | ||
544 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
545 | ||
b057878b JG |
546 | if (err) { |
547 | kfree(pci_dev_id); | |
30edc14b | 548 | pcistub_device_put(psdev); |
b057878b JG |
549 | } else if (pci_dev_id) |
550 | pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus), | |
551 | dev->bus->number, dev->devfn); | |
30edc14b KRW |
552 | |
553 | return err; | |
554 | } | |
555 | ||
24d8bf1b KRW |
556 | /* Called when 'bind'. This means we must _NOT_ call pci_reset_function or |
557 | * other functions that take the sysfs lock. */ | |
345a5255 | 558 | static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id) |
30edc14b | 559 | { |
b057878b JG |
560 | int err = 0, match; |
561 | struct pcistub_device_id *pci_dev_id = NULL; | |
30edc14b KRW |
562 | |
563 | dev_dbg(&dev->dev, "probing...\n"); | |
564 | ||
b057878b JG |
565 | match = pcistub_match(dev); |
566 | ||
567 | if ((dev->driver_override && | |
568 | !strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) || | |
569 | match) { | |
30edc14b KRW |
570 | |
571 | if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL | |
572 | && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { | |
573 | dev_err(&dev->dev, "can't export pci devices that " | |
574 | "don't have a normal (0) or bridge (1) " | |
575 | "header type!\n"); | |
576 | err = -ENODEV; | |
577 | goto out; | |
578 | } | |
579 | ||
b057878b JG |
580 | if (!match) { |
581 | pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_ATOMIC); | |
582 | if (!pci_dev_id) { | |
583 | err = -ENOMEM; | |
584 | goto out; | |
585 | } | |
586 | } | |
587 | ||
30edc14b | 588 | dev_info(&dev->dev, "seizing device\n"); |
b057878b | 589 | err = pcistub_seize(dev, pci_dev_id); |
30edc14b KRW |
590 | } else |
591 | /* Didn't find the device */ | |
592 | err = -ENODEV; | |
593 | ||
594 | out: | |
595 | return err; | |
596 | } | |
597 | ||
24d8bf1b KRW |
598 | /* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or |
599 | * other functions that take the sysfs lock. */ | |
30edc14b KRW |
600 | static void pcistub_remove(struct pci_dev *dev) |
601 | { | |
602 | struct pcistub_device *psdev, *found_psdev = NULL; | |
603 | unsigned long flags; | |
604 | ||
605 | dev_dbg(&dev->dev, "removing\n"); | |
606 | ||
607 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
608 | ||
a92336a1 | 609 | xen_pcibk_config_quirk_release(dev); |
30edc14b KRW |
610 | |
611 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
612 | if (psdev->dev == dev) { | |
613 | found_psdev = psdev; | |
614 | break; | |
615 | } | |
616 | } | |
617 | ||
618 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
619 | ||
620 | if (found_psdev) { | |
b5d51214 KRW |
621 | dev_dbg(&dev->dev, "found device to remove %s\n", |
622 | found_psdev->pdev ? "- in-use" : ""); | |
30edc14b KRW |
623 | |
624 | if (found_psdev->pdev) { | |
b5d51214 KRW |
625 | int domid = xen_find_device_domain_owner(dev); |
626 | ||
627 | pr_warn("****** removing device %s while still in-use by domain %d! ******\n", | |
628 | pci_name(found_psdev->dev), domid); | |
283c0972 JP |
629 | pr_warn("****** driver domain may still access this device's i/o resources!\n"); |
630 | pr_warn("****** shutdown driver domain before binding device\n"); | |
631 | pr_warn("****** to other drivers or domains\n"); | |
30edc14b | 632 | |
8be9df6d KRW |
633 | /* N.B. This ends up calling pcistub_put_pci_dev which ends up |
634 | * doing the FLR. */ | |
a92336a1 | 635 | xen_pcibk_release_pci_dev(found_psdev->pdev, |
e8801a74 KRW |
636 | found_psdev->dev, |
637 | false /* caller holds the lock. */); | |
30edc14b KRW |
638 | } |
639 | ||
640 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
641 | list_del(&found_psdev->dev_list); | |
642 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
643 | ||
644 | /* the final put for releasing from the list */ | |
645 | pcistub_device_put(found_psdev); | |
646 | } | |
647 | } | |
648 | ||
9baa3c34 | 649 | static const struct pci_device_id pcistub_ids[] = { |
30edc14b KRW |
650 | { |
651 | .vendor = PCI_ANY_ID, | |
652 | .device = PCI_ANY_ID, | |
653 | .subvendor = PCI_ANY_ID, | |
654 | .subdevice = PCI_ANY_ID, | |
655 | }, | |
656 | {0,}, | |
657 | }; | |
658 | ||
659 | #define PCI_NODENAME_MAX 40 | |
660 | static void kill_domain_by_device(struct pcistub_device *psdev) | |
661 | { | |
662 | struct xenbus_transaction xbt; | |
663 | int err; | |
664 | char nodename[PCI_NODENAME_MAX]; | |
665 | ||
72bf809a | 666 | BUG_ON(!psdev); |
30edc14b KRW |
667 | snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0", |
668 | psdev->pdev->xdev->otherend_id); | |
30edc14b KRW |
669 | |
670 | again: | |
671 | err = xenbus_transaction_start(&xbt); | |
672 | if (err) { | |
673 | dev_err(&psdev->dev->dev, | |
674 | "error %d when start xenbus transaction\n", err); | |
675 | return; | |
676 | } | |
677 | /*PV AER handlers will set this flag*/ | |
678 | xenbus_printf(xbt, nodename, "aerState" , "aerfail"); | |
679 | err = xenbus_transaction_end(xbt, 0); | |
680 | if (err) { | |
681 | if (err == -EAGAIN) | |
682 | goto again; | |
683 | dev_err(&psdev->dev->dev, | |
684 | "error %d when end xenbus transaction\n", err); | |
685 | return; | |
686 | } | |
687 | } | |
688 | ||
689 | /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and | |
a92336a1 | 690 | * backend need to have cooperation. In xen_pcibk, those steps will do similar |
30edc14b KRW |
691 | * jobs: send service request and waiting for front_end response. |
692 | */ | |
693 | static pci_ers_result_t common_process(struct pcistub_device *psdev, | |
a92336a1 KRW |
694 | pci_channel_state_t state, int aer_cmd, |
695 | pci_ers_result_t result) | |
30edc14b KRW |
696 | { |
697 | pci_ers_result_t res = result; | |
698 | struct xen_pcie_aer_op *aer_op; | |
c1a04339 KRW |
699 | struct xen_pcibk_device *pdev = psdev->pdev; |
700 | struct xen_pci_sharedinfo *sh_info = pdev->sh_info; | |
30edc14b KRW |
701 | int ret; |
702 | ||
703 | /*with PV AER drivers*/ | |
c1a04339 | 704 | aer_op = &(sh_info->aer_op); |
30edc14b KRW |
705 | aer_op->cmd = aer_cmd ; |
706 | /*useful for error_detected callback*/ | |
707 | aer_op->err = state; | |
708 | /*pcifront_end BDF*/ | |
a92336a1 | 709 | ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev, |
30edc14b KRW |
710 | &aer_op->domain, &aer_op->bus, &aer_op->devfn); |
711 | if (!ret) { | |
712 | dev_err(&psdev->dev->dev, | |
a92336a1 | 713 | DRV_NAME ": failed to get pcifront device\n"); |
30edc14b KRW |
714 | return PCI_ERS_RESULT_NONE; |
715 | } | |
716 | wmb(); | |
717 | ||
718 | dev_dbg(&psdev->dev->dev, | |
a92336a1 | 719 | DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n", |
30edc14b | 720 | aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn); |
a92336a1 KRW |
721 | /*local flag to mark there's aer request, xen_pcibk callback will use |
722 | * this flag to judge whether we need to check pci-front give aer | |
723 | * service ack signal | |
30edc14b | 724 | */ |
c1a04339 | 725 | set_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); |
30edc14b KRW |
726 | |
727 | /*It is possible that a pcifront conf_read_write ops request invokes | |
728 | * the callback which cause the spurious execution of wake_up. | |
729 | * Yet it is harmless and better than a spinlock here | |
730 | */ | |
731 | set_bit(_XEN_PCIB_active, | |
c1a04339 | 732 | (unsigned long *)&sh_info->flags); |
30edc14b | 733 | wmb(); |
c1a04339 | 734 | notify_remote_via_irq(pdev->evtchn_irq); |
30edc14b | 735 | |
a92336a1 KRW |
736 | ret = wait_event_timeout(xen_pcibk_aer_wait_queue, |
737 | !(test_bit(_XEN_PCIB_active, (unsigned long *) | |
c1a04339 | 738 | &sh_info->flags)), 300*HZ); |
30edc14b KRW |
739 | |
740 | if (!ret) { | |
741 | if (test_bit(_XEN_PCIB_active, | |
c1a04339 | 742 | (unsigned long *)&sh_info->flags)) { |
30edc14b KRW |
743 | dev_err(&psdev->dev->dev, |
744 | "pcifront aer process not responding!\n"); | |
745 | clear_bit(_XEN_PCIB_active, | |
c1a04339 | 746 | (unsigned long *)&sh_info->flags); |
30edc14b KRW |
747 | aer_op->err = PCI_ERS_RESULT_NONE; |
748 | return res; | |
749 | } | |
750 | } | |
c1a04339 | 751 | clear_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); |
30edc14b KRW |
752 | |
753 | if (test_bit(_XEN_PCIF_active, | |
c1a04339 | 754 | (unsigned long *)&sh_info->flags)) { |
30edc14b | 755 | dev_dbg(&psdev->dev->dev, |
402c5e15 | 756 | "schedule pci_conf service in " DRV_NAME "\n"); |
a92336a1 | 757 | xen_pcibk_test_and_schedule_op(psdev->pdev); |
30edc14b KRW |
758 | } |
759 | ||
760 | res = (pci_ers_result_t)aer_op->err; | |
761 | return res; | |
762 | } | |
763 | ||
764 | /* | |
a92336a1 | 765 | * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case |
30edc14b KRW |
766 | * of the device driver could provide this service, and then wait for pcifront |
767 | * ack. | |
768 | * @dev: pointer to PCI devices | |
769 | * return value is used by aer_core do_recovery policy | |
770 | */ | |
a92336a1 | 771 | static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev) |
30edc14b KRW |
772 | { |
773 | struct pcistub_device *psdev; | |
774 | pci_ers_result_t result; | |
775 | ||
776 | result = PCI_ERS_RESULT_RECOVERED; | |
a92336a1 | 777 | dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n", |
30edc14b KRW |
778 | dev->bus->number, dev->devfn); |
779 | ||
780 | down_write(&pcistub_sem); | |
781 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
782 | dev->bus->number, | |
783 | PCI_SLOT(dev->devfn), | |
784 | PCI_FUNC(dev->devfn)); | |
785 | ||
786 | if (!psdev || !psdev->pdev) { | |
787 | dev_err(&dev->dev, | |
a92336a1 | 788 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
789 | goto end; |
790 | } | |
791 | ||
792 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 793 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
794 | " by HVM, kill it\n"); |
795 | kill_domain_by_device(psdev); | |
e6aa70a0 | 796 | goto end; |
30edc14b KRW |
797 | } |
798 | ||
799 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
800 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
801 | dev_err(&dev->dev, | |
802 | "guest with no AER driver should have been killed\n"); | |
e6aa70a0 | 803 | goto end; |
30edc14b KRW |
804 | } |
805 | result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result); | |
806 | ||
807 | if (result == PCI_ERS_RESULT_NONE || | |
808 | result == PCI_ERS_RESULT_DISCONNECT) { | |
809 | dev_dbg(&dev->dev, | |
810 | "No AER slot_reset service or disconnected!\n"); | |
811 | kill_domain_by_device(psdev); | |
812 | } | |
30edc14b | 813 | end: |
e6aa70a0 JB |
814 | if (psdev) |
815 | pcistub_device_put(psdev); | |
30edc14b KRW |
816 | up_write(&pcistub_sem); |
817 | return result; | |
818 | ||
819 | } | |
820 | ||
821 | ||
a92336a1 | 822 | /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront |
30edc14b KRW |
823 | * in case of the device driver could provide this service, and then wait |
824 | * for pcifront ack | |
825 | * @dev: pointer to PCI devices | |
826 | * return value is used by aer_core do_recovery policy | |
827 | */ | |
828 | ||
a92336a1 | 829 | static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev) |
30edc14b KRW |
830 | { |
831 | struct pcistub_device *psdev; | |
832 | pci_ers_result_t result; | |
833 | ||
834 | result = PCI_ERS_RESULT_RECOVERED; | |
a92336a1 | 835 | dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n", |
30edc14b KRW |
836 | dev->bus->number, dev->devfn); |
837 | ||
838 | down_write(&pcistub_sem); | |
839 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
840 | dev->bus->number, | |
841 | PCI_SLOT(dev->devfn), | |
842 | PCI_FUNC(dev->devfn)); | |
843 | ||
844 | if (!psdev || !psdev->pdev) { | |
845 | dev_err(&dev->dev, | |
a92336a1 | 846 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
847 | goto end; |
848 | } | |
849 | ||
850 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 851 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
852 | " by HVM, kill it\n"); |
853 | kill_domain_by_device(psdev); | |
e6aa70a0 | 854 | goto end; |
30edc14b KRW |
855 | } |
856 | ||
857 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
858 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
859 | dev_err(&dev->dev, | |
860 | "guest with no AER driver should have been killed\n"); | |
e6aa70a0 | 861 | goto end; |
30edc14b KRW |
862 | } |
863 | result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result); | |
864 | ||
865 | if (result == PCI_ERS_RESULT_NONE || | |
866 | result == PCI_ERS_RESULT_DISCONNECT) { | |
867 | dev_dbg(&dev->dev, | |
868 | "No AER mmio_enabled service or disconnected!\n"); | |
869 | kill_domain_by_device(psdev); | |
870 | } | |
30edc14b | 871 | end: |
e6aa70a0 JB |
872 | if (psdev) |
873 | pcistub_device_put(psdev); | |
30edc14b KRW |
874 | up_write(&pcistub_sem); |
875 | return result; | |
876 | } | |
877 | ||
a92336a1 | 878 | /*xen_pcibk_error_detected: it will send the error_detected request to pcifront |
30edc14b KRW |
879 | * in case of the device driver could provide this service, and then wait |
880 | * for pcifront ack. | |
881 | * @dev: pointer to PCI devices | |
882 | * @error: the current PCI connection state | |
883 | * return value is used by aer_core do_recovery policy | |
884 | */ | |
885 | ||
a92336a1 | 886 | static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev, |
30edc14b KRW |
887 | pci_channel_state_t error) |
888 | { | |
889 | struct pcistub_device *psdev; | |
890 | pci_ers_result_t result; | |
891 | ||
892 | result = PCI_ERS_RESULT_CAN_RECOVER; | |
a92336a1 | 893 | dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n", |
30edc14b KRW |
894 | dev->bus->number, dev->devfn); |
895 | ||
896 | down_write(&pcistub_sem); | |
897 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
898 | dev->bus->number, | |
899 | PCI_SLOT(dev->devfn), | |
900 | PCI_FUNC(dev->devfn)); | |
901 | ||
902 | if (!psdev || !psdev->pdev) { | |
903 | dev_err(&dev->dev, | |
a92336a1 | 904 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
905 | goto end; |
906 | } | |
907 | ||
908 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 909 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
910 | " by HVM, kill it\n"); |
911 | kill_domain_by_device(psdev); | |
e6aa70a0 | 912 | goto end; |
30edc14b KRW |
913 | } |
914 | ||
915 | /*Guest owns the device yet no aer handler regiested, kill guest*/ | |
916 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
917 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
918 | dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n"); | |
919 | kill_domain_by_device(psdev); | |
e6aa70a0 | 920 | goto end; |
30edc14b KRW |
921 | } |
922 | result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result); | |
923 | ||
924 | if (result == PCI_ERS_RESULT_NONE || | |
925 | result == PCI_ERS_RESULT_DISCONNECT) { | |
926 | dev_dbg(&dev->dev, | |
927 | "No AER error_detected service or disconnected!\n"); | |
928 | kill_domain_by_device(psdev); | |
929 | } | |
30edc14b | 930 | end: |
e6aa70a0 JB |
931 | if (psdev) |
932 | pcistub_device_put(psdev); | |
30edc14b KRW |
933 | up_write(&pcistub_sem); |
934 | return result; | |
935 | } | |
936 | ||
a92336a1 | 937 | /*xen_pcibk_error_resume: it will send the error_resume request to pcifront |
30edc14b KRW |
938 | * in case of the device driver could provide this service, and then wait |
939 | * for pcifront ack. | |
940 | * @dev: pointer to PCI devices | |
941 | */ | |
942 | ||
a92336a1 | 943 | static void xen_pcibk_error_resume(struct pci_dev *dev) |
30edc14b KRW |
944 | { |
945 | struct pcistub_device *psdev; | |
946 | ||
a92336a1 | 947 | dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n", |
30edc14b KRW |
948 | dev->bus->number, dev->devfn); |
949 | ||
950 | down_write(&pcistub_sem); | |
951 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
952 | dev->bus->number, | |
953 | PCI_SLOT(dev->devfn), | |
954 | PCI_FUNC(dev->devfn)); | |
955 | ||
956 | if (!psdev || !psdev->pdev) { | |
957 | dev_err(&dev->dev, | |
a92336a1 | 958 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
959 | goto end; |
960 | } | |
961 | ||
962 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 963 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
964 | " by HVM, kill it\n"); |
965 | kill_domain_by_device(psdev); | |
e6aa70a0 | 966 | goto end; |
30edc14b KRW |
967 | } |
968 | ||
969 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
970 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
971 | dev_err(&dev->dev, | |
972 | "guest with no AER driver should have been killed\n"); | |
973 | kill_domain_by_device(psdev); | |
e6aa70a0 | 974 | goto end; |
30edc14b KRW |
975 | } |
976 | common_process(psdev, 1, XEN_PCI_OP_aer_resume, | |
977 | PCI_ERS_RESULT_RECOVERED); | |
30edc14b | 978 | end: |
e6aa70a0 JB |
979 | if (psdev) |
980 | pcistub_device_put(psdev); | |
30edc14b KRW |
981 | up_write(&pcistub_sem); |
982 | return; | |
983 | } | |
984 | ||
a92336a1 | 985 | /*add xen_pcibk AER handling*/ |
1d352035 | 986 | static const struct pci_error_handlers xen_pcibk_error_handler = { |
a92336a1 KRW |
987 | .error_detected = xen_pcibk_error_detected, |
988 | .mmio_enabled = xen_pcibk_mmio_enabled, | |
989 | .slot_reset = xen_pcibk_slot_reset, | |
990 | .resume = xen_pcibk_error_resume, | |
30edc14b KRW |
991 | }; |
992 | ||
993 | /* | |
994 | * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't | |
995 | * for a normal device. I don't want it to be loaded automatically. | |
996 | */ | |
997 | ||
a92336a1 KRW |
998 | static struct pci_driver xen_pcibk_pci_driver = { |
999 | /* The name should be xen_pciback, but until the tools are updated | |
1000 | * we will keep it as pciback. */ | |
b057878b | 1001 | .name = PCISTUB_DRIVER_NAME, |
30edc14b KRW |
1002 | .id_table = pcistub_ids, |
1003 | .probe = pcistub_probe, | |
1004 | .remove = pcistub_remove, | |
a92336a1 | 1005 | .err_handler = &xen_pcibk_error_handler, |
30edc14b KRW |
1006 | }; |
1007 | ||
1008 | static inline int str_to_slot(const char *buf, int *domain, int *bus, | |
1009 | int *slot, int *func) | |
1010 | { | |
5b71fbdc | 1011 | int parsed = 0; |
30edc14b | 1012 | |
5b71fbdc JB |
1013 | switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func, |
1014 | &parsed)) { | |
c3cb4709 JB |
1015 | case 3: |
1016 | *func = -1; | |
5b71fbdc | 1017 | sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed); |
c3cb4709 JB |
1018 | break; |
1019 | case 2: | |
1020 | *slot = *func = -1; | |
5b71fbdc | 1021 | sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed); |
c3cb4709 JB |
1022 | break; |
1023 | } | |
5b71fbdc | 1024 | if (parsed && !buf[parsed]) |
30edc14b | 1025 | return 0; |
30edc14b KRW |
1026 | |
1027 | /* try again without domain */ | |
1028 | *domain = 0; | |
5b71fbdc | 1029 | switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) { |
c3cb4709 JB |
1030 | case 2: |
1031 | *func = -1; | |
5b71fbdc | 1032 | sscanf(buf, " %x:%x.* %n", bus, slot, &parsed); |
c3cb4709 JB |
1033 | break; |
1034 | case 1: | |
1035 | *slot = *func = -1; | |
5b71fbdc | 1036 | sscanf(buf, " %x:*.* %n", bus, &parsed); |
c3cb4709 JB |
1037 | break; |
1038 | } | |
5b71fbdc | 1039 | if (parsed && !buf[parsed]) |
30edc14b KRW |
1040 | return 0; |
1041 | ||
1042 | return -EINVAL; | |
1043 | } | |
1044 | ||
1045 | static inline int str_to_quirk(const char *buf, int *domain, int *bus, int | |
1046 | *slot, int *func, int *reg, int *size, int *mask) | |
1047 | { | |
5b71fbdc JB |
1048 | int parsed = 0; |
1049 | ||
b3e40b72 | 1050 | sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func, |
5b71fbdc JB |
1051 | reg, size, mask, &parsed); |
1052 | if (parsed && !buf[parsed]) | |
1053 | return 0; | |
30edc14b | 1054 | |
5b71fbdc JB |
1055 | /* try again without domain */ |
1056 | *domain = 0; | |
b3e40b72 | 1057 | sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size, |
5b71fbdc JB |
1058 | mask, &parsed); |
1059 | if (parsed && !buf[parsed]) | |
30edc14b | 1060 | return 0; |
5b71fbdc | 1061 | |
30edc14b KRW |
1062 | return -EINVAL; |
1063 | } | |
1064 | ||
1065 | static int pcistub_device_id_add(int domain, int bus, int slot, int func) | |
1066 | { | |
1067 | struct pcistub_device_id *pci_dev_id; | |
b3e40b72 | 1068 | int rc = 0, devfn = PCI_DEVFN(slot, func); |
c3cb4709 JB |
1069 | |
1070 | if (slot < 0) { | |
1071 | for (slot = 0; !rc && slot < 32; ++slot) | |
1072 | rc = pcistub_device_id_add(domain, bus, slot, func); | |
1073 | return rc; | |
1074 | } | |
1075 | ||
1076 | if (func < 0) { | |
1077 | for (func = 0; !rc && func < 8; ++func) | |
1078 | rc = pcistub_device_id_add(domain, bus, slot, func); | |
1079 | return rc; | |
1080 | } | |
30edc14b | 1081 | |
b3e40b72 JB |
1082 | if (( |
1083 | #if !defined(MODULE) /* pci_domains_supported is not being exported */ \ | |
1084 | || !defined(CONFIG_PCI_DOMAINS) | |
1085 | !pci_domains_supported ? domain : | |
1086 | #endif | |
1087 | domain < 0 || domain > 0xffff) | |
1088 | || bus < 0 || bus > 0xff | |
1089 | || PCI_SLOT(devfn) != slot | |
1090 | || PCI_FUNC(devfn) != func) | |
1091 | return -EINVAL; | |
1092 | ||
30edc14b KRW |
1093 | pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); |
1094 | if (!pci_dev_id) | |
1095 | return -ENOMEM; | |
1096 | ||
283c0972 | 1097 | pr_debug("wants to seize %04x:%02x:%02x.%d\n", |
30edc14b KRW |
1098 | domain, bus, slot, func); |
1099 | ||
9f8bee9c | 1100 | pcistub_device_id_add_list(pci_dev_id, domain, bus, devfn); |
30edc14b KRW |
1101 | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | static int pcistub_device_id_remove(int domain, int bus, int slot, int func) | |
1106 | { | |
1107 | struct pcistub_device_id *pci_dev_id, *t; | |
30edc14b KRW |
1108 | int err = -ENOENT; |
1109 | unsigned long flags; | |
1110 | ||
1111 | spin_lock_irqsave(&device_ids_lock, flags); | |
1112 | list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids, | |
1113 | slot_list) { | |
c3cb4709 JB |
1114 | if (pci_dev_id->domain == domain && pci_dev_id->bus == bus |
1115 | && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot) | |
1116 | && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) { | |
30edc14b KRW |
1117 | /* Don't break; here because it's possible the same |
1118 | * slot could be in the list more than once | |
1119 | */ | |
1120 | list_del(&pci_dev_id->slot_list); | |
1121 | kfree(pci_dev_id); | |
1122 | ||
1123 | err = 0; | |
1124 | ||
283c0972 JP |
1125 | pr_debug("removed %04x:%02x:%02x.%d from seize list\n", |
1126 | domain, bus, slot, func); | |
30edc14b KRW |
1127 | } |
1128 | } | |
1129 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1130 | ||
1131 | return err; | |
1132 | } | |
1133 | ||
b3e40b72 JB |
1134 | static int pcistub_reg_add(int domain, int bus, int slot, int func, |
1135 | unsigned int reg, unsigned int size, | |
1136 | unsigned int mask) | |
30edc14b KRW |
1137 | { |
1138 | int err = 0; | |
1139 | struct pcistub_device *psdev; | |
1140 | struct pci_dev *dev; | |
1141 | struct config_field *field; | |
1142 | ||
b3e40b72 JB |
1143 | if (reg > 0xfff || (size < 4 && (mask >> (size * 8)))) |
1144 | return -EINVAL; | |
1145 | ||
30edc14b | 1146 | psdev = pcistub_device_find(domain, bus, slot, func); |
e6aa70a0 | 1147 | if (!psdev) { |
30edc14b KRW |
1148 | err = -ENODEV; |
1149 | goto out; | |
1150 | } | |
1151 | dev = psdev->dev; | |
1152 | ||
1153 | field = kzalloc(sizeof(*field), GFP_ATOMIC); | |
1154 | if (!field) { | |
1155 | err = -ENOMEM; | |
1156 | goto out; | |
1157 | } | |
1158 | ||
1159 | field->offset = reg; | |
1160 | field->size = size; | |
1161 | field->mask = mask; | |
1162 | field->init = NULL; | |
1163 | field->reset = NULL; | |
1164 | field->release = NULL; | |
a92336a1 | 1165 | field->clean = xen_pcibk_config_field_free; |
30edc14b | 1166 | |
a92336a1 | 1167 | err = xen_pcibk_config_quirks_add_field(dev, field); |
30edc14b KRW |
1168 | if (err) |
1169 | kfree(field); | |
1170 | out: | |
e6aa70a0 JB |
1171 | if (psdev) |
1172 | pcistub_device_put(psdev); | |
30edc14b KRW |
1173 | return err; |
1174 | } | |
1175 | ||
0538dcb0 GKH |
1176 | static ssize_t new_slot_store(struct device_driver *drv, const char *buf, |
1177 | size_t count) | |
30edc14b KRW |
1178 | { |
1179 | int domain, bus, slot, func; | |
1180 | int err; | |
1181 | ||
1182 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1183 | if (err) | |
1184 | goto out; | |
1185 | ||
1186 | err = pcistub_device_id_add(domain, bus, slot, func); | |
1187 | ||
1188 | out: | |
1189 | if (!err) | |
1190 | err = count; | |
1191 | return err; | |
1192 | } | |
0538dcb0 | 1193 | static DRIVER_ATTR_WO(new_slot); |
30edc14b | 1194 | |
0538dcb0 GKH |
1195 | static ssize_t remove_slot_store(struct device_driver *drv, const char *buf, |
1196 | size_t count) | |
30edc14b KRW |
1197 | { |
1198 | int domain, bus, slot, func; | |
1199 | int err; | |
1200 | ||
1201 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1202 | if (err) | |
1203 | goto out; | |
1204 | ||
1205 | err = pcistub_device_id_remove(domain, bus, slot, func); | |
1206 | ||
1207 | out: | |
1208 | if (!err) | |
1209 | err = count; | |
1210 | return err; | |
1211 | } | |
0538dcb0 | 1212 | static DRIVER_ATTR_WO(remove_slot); |
30edc14b | 1213 | |
0538dcb0 | 1214 | static ssize_t slots_show(struct device_driver *drv, char *buf) |
30edc14b KRW |
1215 | { |
1216 | struct pcistub_device_id *pci_dev_id; | |
1217 | size_t count = 0; | |
1218 | unsigned long flags; | |
1219 | ||
1220 | spin_lock_irqsave(&device_ids_lock, flags); | |
1221 | list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { | |
1222 | if (count >= PAGE_SIZE) | |
1223 | break; | |
1224 | ||
1225 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
e4de866a | 1226 | "%04x:%02x:%02x.%d\n", |
30edc14b KRW |
1227 | pci_dev_id->domain, pci_dev_id->bus, |
1228 | PCI_SLOT(pci_dev_id->devfn), | |
1229 | PCI_FUNC(pci_dev_id->devfn)); | |
1230 | } | |
1231 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1232 | ||
1233 | return count; | |
1234 | } | |
0538dcb0 | 1235 | static DRIVER_ATTR_RO(slots); |
30edc14b | 1236 | |
0538dcb0 | 1237 | static ssize_t irq_handlers_show(struct device_driver *drv, char *buf) |
0513fe9e KRW |
1238 | { |
1239 | struct pcistub_device *psdev; | |
a92336a1 | 1240 | struct xen_pcibk_dev_data *dev_data; |
0513fe9e KRW |
1241 | size_t count = 0; |
1242 | unsigned long flags; | |
1243 | ||
1244 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1245 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1246 | if (count >= PAGE_SIZE) | |
1247 | break; | |
1248 | if (!psdev->dev) | |
1249 | continue; | |
1250 | dev_data = pci_get_drvdata(psdev->dev); | |
1251 | if (!dev_data) | |
1252 | continue; | |
1253 | count += | |
1254 | scnprintf(buf + count, PAGE_SIZE - count, | |
1255 | "%s:%s:%sing:%ld\n", | |
1256 | pci_name(psdev->dev), | |
1257 | dev_data->isr_on ? "on" : "off", | |
1258 | dev_data->ack_intr ? "ack" : "not ack", | |
1259 | dev_data->handled); | |
1260 | } | |
1261 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1262 | return count; | |
1263 | } | |
0538dcb0 | 1264 | static DRIVER_ATTR_RO(irq_handlers); |
0513fe9e | 1265 | |
0538dcb0 GKH |
1266 | static ssize_t irq_handler_state_store(struct device_driver *drv, |
1267 | const char *buf, size_t count) | |
0513fe9e KRW |
1268 | { |
1269 | struct pcistub_device *psdev; | |
a92336a1 | 1270 | struct xen_pcibk_dev_data *dev_data; |
0513fe9e | 1271 | int domain, bus, slot, func; |
405010df | 1272 | int err; |
0513fe9e KRW |
1273 | |
1274 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1275 | if (err) | |
e6aa70a0 | 1276 | return err; |
0513fe9e KRW |
1277 | |
1278 | psdev = pcistub_device_find(domain, bus, slot, func); | |
405010df WY |
1279 | if (!psdev) { |
1280 | err = -ENOENT; | |
0513fe9e | 1281 | goto out; |
405010df | 1282 | } |
0513fe9e KRW |
1283 | |
1284 | dev_data = pci_get_drvdata(psdev->dev); | |
405010df WY |
1285 | if (!dev_data) { |
1286 | err = -ENOENT; | |
0513fe9e | 1287 | goto out; |
405010df | 1288 | } |
0513fe9e KRW |
1289 | |
1290 | dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n", | |
1291 | dev_data->irq_name, dev_data->isr_on, | |
1292 | !dev_data->isr_on); | |
1293 | ||
1294 | dev_data->isr_on = !(dev_data->isr_on); | |
1295 | if (dev_data->isr_on) | |
1296 | dev_data->ack_intr = 1; | |
1297 | out: | |
e6aa70a0 JB |
1298 | if (psdev) |
1299 | pcistub_device_put(psdev); | |
0513fe9e KRW |
1300 | if (!err) |
1301 | err = count; | |
1302 | return err; | |
1303 | } | |
0538dcb0 | 1304 | static DRIVER_ATTR_WO(irq_handler_state); |
0513fe9e | 1305 | |
0538dcb0 GKH |
1306 | static ssize_t quirks_store(struct device_driver *drv, const char *buf, |
1307 | size_t count) | |
30edc14b KRW |
1308 | { |
1309 | int domain, bus, slot, func, reg, size, mask; | |
1310 | int err; | |
1311 | ||
1312 | err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size, | |
1313 | &mask); | |
1314 | if (err) | |
1315 | goto out; | |
1316 | ||
1317 | err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask); | |
1318 | ||
1319 | out: | |
1320 | if (!err) | |
1321 | err = count; | |
1322 | return err; | |
1323 | } | |
1324 | ||
0538dcb0 | 1325 | static ssize_t quirks_show(struct device_driver *drv, char *buf) |
30edc14b KRW |
1326 | { |
1327 | int count = 0; | |
1328 | unsigned long flags; | |
a92336a1 KRW |
1329 | struct xen_pcibk_config_quirk *quirk; |
1330 | struct xen_pcibk_dev_data *dev_data; | |
30edc14b KRW |
1331 | const struct config_field *field; |
1332 | const struct config_field_entry *cfg_entry; | |
1333 | ||
1334 | spin_lock_irqsave(&device_ids_lock, flags); | |
a92336a1 | 1335 | list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) { |
30edc14b KRW |
1336 | if (count >= PAGE_SIZE) |
1337 | goto out; | |
1338 | ||
1339 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1340 | "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n", | |
1341 | quirk->pdev->bus->number, | |
1342 | PCI_SLOT(quirk->pdev->devfn), | |
1343 | PCI_FUNC(quirk->pdev->devfn), | |
1344 | quirk->devid.vendor, quirk->devid.device, | |
1345 | quirk->devid.subvendor, | |
1346 | quirk->devid.subdevice); | |
1347 | ||
1348 | dev_data = pci_get_drvdata(quirk->pdev); | |
1349 | ||
1350 | list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { | |
1351 | field = cfg_entry->field; | |
1352 | if (count >= PAGE_SIZE) | |
1353 | goto out; | |
1354 | ||
1355 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1356 | "\t\t%08x:%01x:%08x\n", | |
1357 | cfg_entry->base_offset + | |
1358 | field->offset, field->size, | |
1359 | field->mask); | |
1360 | } | |
1361 | } | |
1362 | ||
1363 | out: | |
1364 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1365 | ||
1366 | return count; | |
1367 | } | |
0538dcb0 | 1368 | static DRIVER_ATTR_RW(quirks); |
30edc14b | 1369 | |
0538dcb0 GKH |
1370 | static ssize_t permissive_store(struct device_driver *drv, const char *buf, |
1371 | size_t count) | |
30edc14b KRW |
1372 | { |
1373 | int domain, bus, slot, func; | |
1374 | int err; | |
1375 | struct pcistub_device *psdev; | |
a92336a1 | 1376 | struct xen_pcibk_dev_data *dev_data; |
b3e40b72 | 1377 | |
30edc14b KRW |
1378 | err = str_to_slot(buf, &domain, &bus, &slot, &func); |
1379 | if (err) | |
1380 | goto out; | |
b3e40b72 | 1381 | |
30edc14b KRW |
1382 | psdev = pcistub_device_find(domain, bus, slot, func); |
1383 | if (!psdev) { | |
1384 | err = -ENODEV; | |
1385 | goto out; | |
1386 | } | |
e6aa70a0 | 1387 | |
30edc14b KRW |
1388 | dev_data = pci_get_drvdata(psdev->dev); |
1389 | /* the driver data for a device should never be null at this point */ | |
1390 | if (!dev_data) { | |
1391 | err = -ENXIO; | |
1392 | goto release; | |
1393 | } | |
1394 | if (!dev_data->permissive) { | |
1395 | dev_data->permissive = 1; | |
1396 | /* Let user know that what they're doing could be unsafe */ | |
1397 | dev_warn(&psdev->dev->dev, "enabling permissive mode " | |
1398 | "configuration space accesses!\n"); | |
1399 | dev_warn(&psdev->dev->dev, | |
1400 | "permissive mode is potentially unsafe!\n"); | |
1401 | } | |
1402 | release: | |
1403 | pcistub_device_put(psdev); | |
1404 | out: | |
1405 | if (!err) | |
1406 | err = count; | |
1407 | return err; | |
1408 | } | |
1409 | ||
1410 | static ssize_t permissive_show(struct device_driver *drv, char *buf) | |
1411 | { | |
1412 | struct pcistub_device *psdev; | |
a92336a1 | 1413 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
1414 | size_t count = 0; |
1415 | unsigned long flags; | |
1416 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1417 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1418 | if (count >= PAGE_SIZE) | |
1419 | break; | |
1420 | if (!psdev->dev) | |
1421 | continue; | |
1422 | dev_data = pci_get_drvdata(psdev->dev); | |
1423 | if (!dev_data || !dev_data->permissive) | |
1424 | continue; | |
1425 | count += | |
1426 | scnprintf(buf + count, PAGE_SIZE - count, "%s\n", | |
1427 | pci_name(psdev->dev)); | |
1428 | } | |
1429 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1430 | return count; | |
1431 | } | |
0538dcb0 | 1432 | static DRIVER_ATTR_RW(permissive); |
30edc14b KRW |
1433 | |
1434 | static void pcistub_exit(void) | |
1435 | { | |
a92336a1 KRW |
1436 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot); |
1437 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
30edc14b | 1438 | &driver_attr_remove_slot); |
a92336a1 KRW |
1439 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots); |
1440 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks); | |
1441 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
1442 | &driver_attr_permissive); | |
1443 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
0513fe9e | 1444 | &driver_attr_irq_handlers); |
a92336a1 | 1445 | driver_remove_file(&xen_pcibk_pci_driver.driver, |
0513fe9e | 1446 | &driver_attr_irq_handler_state); |
a92336a1 | 1447 | pci_unregister_driver(&xen_pcibk_pci_driver); |
30edc14b KRW |
1448 | } |
1449 | ||
1450 | static int __init pcistub_init(void) | |
1451 | { | |
1452 | int pos = 0; | |
1453 | int err = 0; | |
1454 | int domain, bus, slot, func; | |
1455 | int parsed; | |
1456 | ||
1457 | if (pci_devs_to_hide && *pci_devs_to_hide) { | |
1458 | do { | |
1459 | parsed = 0; | |
1460 | ||
1461 | err = sscanf(pci_devs_to_hide + pos, | |
1462 | " (%x:%x:%x.%x) %n", | |
1463 | &domain, &bus, &slot, &func, &parsed); | |
c3cb4709 JB |
1464 | switch (err) { |
1465 | case 3: | |
1466 | func = -1; | |
5b71fbdc JB |
1467 | sscanf(pci_devs_to_hide + pos, |
1468 | " (%x:%x:%x.*) %n", | |
1469 | &domain, &bus, &slot, &parsed); | |
c3cb4709 JB |
1470 | break; |
1471 | case 2: | |
1472 | slot = func = -1; | |
5b71fbdc JB |
1473 | sscanf(pci_devs_to_hide + pos, |
1474 | " (%x:%x:*.*) %n", | |
1475 | &domain, &bus, &parsed); | |
c3cb4709 JB |
1476 | break; |
1477 | } | |
1478 | ||
5b71fbdc | 1479 | if (!parsed) { |
30edc14b KRW |
1480 | domain = 0; |
1481 | err = sscanf(pci_devs_to_hide + pos, | |
1482 | " (%x:%x.%x) %n", | |
1483 | &bus, &slot, &func, &parsed); | |
c3cb4709 JB |
1484 | switch (err) { |
1485 | case 2: | |
1486 | func = -1; | |
5b71fbdc JB |
1487 | sscanf(pci_devs_to_hide + pos, |
1488 | " (%x:%x.*) %n", | |
1489 | &bus, &slot, &parsed); | |
c3cb4709 JB |
1490 | break; |
1491 | case 1: | |
1492 | slot = func = -1; | |
5b71fbdc JB |
1493 | sscanf(pci_devs_to_hide + pos, |
1494 | " (%x:*.*) %n", | |
1495 | &bus, &parsed); | |
c3cb4709 JB |
1496 | break; |
1497 | } | |
30edc14b KRW |
1498 | } |
1499 | ||
5b71fbdc JB |
1500 | if (parsed <= 0) |
1501 | goto parse_error; | |
1502 | ||
30edc14b KRW |
1503 | err = pcistub_device_id_add(domain, bus, slot, func); |
1504 | if (err) | |
1505 | goto out; | |
1506 | ||
30edc14b | 1507 | pos += parsed; |
5b71fbdc | 1508 | } while (pci_devs_to_hide[pos]); |
30edc14b KRW |
1509 | } |
1510 | ||
1511 | /* If we're the first PCI Device Driver to register, we're the | |
1512 | * first one to get offered PCI devices as they become | |
1513 | * available (and thus we can be the first to grab them) | |
1514 | */ | |
a92336a1 | 1515 | err = pci_register_driver(&xen_pcibk_pci_driver); |
30edc14b KRW |
1516 | if (err < 0) |
1517 | goto out; | |
1518 | ||
a92336a1 | 1519 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1520 | &driver_attr_new_slot); |
1521 | if (!err) | |
a92336a1 | 1522 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1523 | &driver_attr_remove_slot); |
1524 | if (!err) | |
a92336a1 | 1525 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1526 | &driver_attr_slots); |
1527 | if (!err) | |
a92336a1 | 1528 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1529 | &driver_attr_quirks); |
1530 | if (!err) | |
a92336a1 | 1531 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1532 | &driver_attr_permissive); |
1533 | ||
0513fe9e | 1534 | if (!err) |
a92336a1 | 1535 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
0513fe9e KRW |
1536 | &driver_attr_irq_handlers); |
1537 | if (!err) | |
a92336a1 | 1538 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
0513fe9e | 1539 | &driver_attr_irq_handler_state); |
30edc14b KRW |
1540 | if (err) |
1541 | pcistub_exit(); | |
1542 | ||
1543 | out: | |
1544 | return err; | |
1545 | ||
1546 | parse_error: | |
283c0972 | 1547 | pr_err("Error parsing pci_devs_to_hide at \"%s\"\n", |
30edc14b KRW |
1548 | pci_devs_to_hide + pos); |
1549 | return -EINVAL; | |
1550 | } | |
1551 | ||
1552 | #ifndef MODULE | |
1553 | /* | |
1554 | * fs_initcall happens before device_initcall | |
a92336a1 | 1555 | * so xen_pcibk *should* get called first (b/c we |
30edc14b KRW |
1556 | * want to suck up any device before other drivers |
1557 | * get a chance by being the first pci device | |
1558 | * driver to register) | |
1559 | */ | |
1560 | fs_initcall(pcistub_init); | |
1561 | #endif | |
1562 | ||
6945c59c JB |
1563 | #ifdef CONFIG_PCI_IOV |
1564 | static struct pcistub_device *find_vfs(const struct pci_dev *pdev) | |
1565 | { | |
1566 | struct pcistub_device *psdev = NULL; | |
1567 | unsigned long flags; | |
1568 | bool found = false; | |
1569 | ||
1570 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1571 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1572 | if (!psdev->pdev && psdev->dev != pdev | |
1573 | && pci_physfn(psdev->dev) == pdev) { | |
1574 | found = true; | |
1575 | break; | |
1576 | } | |
1577 | } | |
1578 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1579 | if (found) | |
1580 | return psdev; | |
1581 | return NULL; | |
1582 | } | |
1583 | ||
1584 | static int pci_stub_notifier(struct notifier_block *nb, | |
1585 | unsigned long action, void *data) | |
1586 | { | |
1587 | struct device *dev = data; | |
1588 | const struct pci_dev *pdev = to_pci_dev(dev); | |
1589 | ||
1590 | if (action != BUS_NOTIFY_UNBIND_DRIVER) | |
1591 | return NOTIFY_DONE; | |
1592 | ||
1593 | if (!pdev->is_physfn) | |
1594 | return NOTIFY_DONE; | |
1595 | ||
1596 | for (;;) { | |
1597 | struct pcistub_device *psdev = find_vfs(pdev); | |
1598 | if (!psdev) | |
1599 | break; | |
1600 | device_release_driver(&psdev->dev->dev); | |
1601 | } | |
1602 | return NOTIFY_DONE; | |
1603 | } | |
1604 | ||
1605 | static struct notifier_block pci_stub_nb = { | |
1606 | .notifier_call = pci_stub_notifier, | |
1607 | }; | |
1608 | #endif | |
1609 | ||
a92336a1 | 1610 | static int __init xen_pcibk_init(void) |
30edc14b KRW |
1611 | { |
1612 | int err; | |
1613 | ||
1614 | if (!xen_initial_domain()) | |
1615 | return -ENODEV; | |
1616 | ||
a92336a1 | 1617 | err = xen_pcibk_config_init(); |
30edc14b KRW |
1618 | if (err) |
1619 | return err; | |
1620 | ||
1621 | #ifdef MODULE | |
1622 | err = pcistub_init(); | |
1623 | if (err < 0) | |
1624 | return err; | |
1625 | #endif | |
1626 | ||
1627 | pcistub_init_devices_late(); | |
a92336a1 | 1628 | err = xen_pcibk_xenbus_register(); |
30edc14b KRW |
1629 | if (err) |
1630 | pcistub_exit(); | |
6945c59c JB |
1631 | #ifdef CONFIG_PCI_IOV |
1632 | else | |
1633 | bus_register_notifier(&pci_bus_type, &pci_stub_nb); | |
1634 | #endif | |
30edc14b KRW |
1635 | |
1636 | return err; | |
1637 | } | |
1638 | ||
a92336a1 | 1639 | static void __exit xen_pcibk_cleanup(void) |
30edc14b | 1640 | { |
6945c59c JB |
1641 | #ifdef CONFIG_PCI_IOV |
1642 | bus_unregister_notifier(&pci_bus_type, &pci_stub_nb); | |
1643 | #endif | |
a92336a1 | 1644 | xen_pcibk_xenbus_unregister(); |
30edc14b KRW |
1645 | pcistub_exit(); |
1646 | } | |
1647 | ||
a92336a1 KRW |
1648 | module_init(xen_pcibk_init); |
1649 | module_exit(xen_pcibk_cleanup); | |
30edc14b KRW |
1650 | |
1651 | MODULE_LICENSE("Dual BSD/GPL"); | |
402c5e15 | 1652 | MODULE_ALIAS("xen-backend:pci"); |