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)) | |
108 | dev_dbg(&dev->dev, "Could not reload PCI state\n"); | |
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 | ||
121 | if (err) | |
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 | |
909b3fdb JB |
136 | dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED; |
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 | ||
152 | static struct pcistub_device *pcistub_device_find(int domain, int bus, | |
153 | int slot, int func) | |
154 | { | |
155 | struct pcistub_device *psdev = NULL; | |
156 | unsigned long flags; | |
157 | ||
158 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
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)) { | |
30edc14b KRW |
166 | pcistub_device_get(psdev); |
167 | goto out; | |
168 | } | |
169 | } | |
170 | ||
171 | /* didn't find it */ | |
172 | psdev = NULL; | |
173 | ||
174 | out: | |
175 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
176 | return psdev; | |
177 | } | |
178 | ||
a92336a1 | 179 | static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev, |
30edc14b KRW |
180 | struct pcistub_device *psdev) |
181 | { | |
182 | struct pci_dev *pci_dev = NULL; | |
183 | unsigned long flags; | |
184 | ||
185 | pcistub_device_get(psdev); | |
186 | ||
187 | spin_lock_irqsave(&psdev->lock, flags); | |
188 | if (!psdev->pdev) { | |
189 | psdev->pdev = pdev; | |
190 | pci_dev = psdev->dev; | |
191 | } | |
192 | spin_unlock_irqrestore(&psdev->lock, flags); | |
193 | ||
194 | if (!pci_dev) | |
195 | pcistub_device_put(psdev); | |
196 | ||
197 | return pci_dev; | |
198 | } | |
199 | ||
a92336a1 | 200 | struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, |
30edc14b KRW |
201 | int domain, int bus, |
202 | int slot, int func) | |
203 | { | |
204 | struct pcistub_device *psdev; | |
205 | struct pci_dev *found_dev = NULL; | |
206 | unsigned long flags; | |
207 | ||
208 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
209 | ||
210 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
211 | if (psdev->dev != NULL | |
212 | && domain == pci_domain_nr(psdev->dev->bus) | |
213 | && bus == psdev->dev->bus->number | |
b3e40b72 JB |
214 | && slot == PCI_SLOT(psdev->dev->devfn) |
215 | && func == PCI_FUNC(psdev->dev->devfn)) { | |
30edc14b KRW |
216 | found_dev = pcistub_device_get_pci_dev(pdev, psdev); |
217 | break; | |
218 | } | |
219 | } | |
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 | ||
245 | void pcistub_put_pci_dev(struct pci_dev *dev) | |
246 | { | |
247 | struct pcistub_device *psdev, *found_psdev = NULL; | |
248 | unsigned long flags; | |
249 | ||
250 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
251 | ||
252 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
253 | if (psdev->dev == dev) { | |
254 | found_psdev = psdev; | |
255 | break; | |
256 | } | |
257 | } | |
258 | ||
259 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
4645bf30 KRW |
260 | if (WARN_ON(!found_psdev)) |
261 | return; | |
30edc14b KRW |
262 | |
263 | /*hold this lock for avoiding breaking link between | |
a92336a1 | 264 | * pcistub and xen_pcibk when AER is in processing |
30edc14b KRW |
265 | */ |
266 | down_write(&pcistub_sem); | |
267 | /* Cleanup our device | |
268 | * (so it's ready for the next domain) | |
269 | */ | |
cd9db80e KRW |
270 | |
271 | /* This is OK - we are running from workqueue context | |
272 | * and want to inhibit the user from fiddling with 'reset' | |
273 | */ | |
274 | pci_reset_function(dev); | |
275 | pci_restore_state(psdev->dev); | |
276 | ||
277 | /* This disables the device. */ | |
a92336a1 | 278 | xen_pcibk_reset_device(found_psdev->dev); |
cd9db80e KRW |
279 | |
280 | /* And cleanup up our emulated fields. */ | |
a92336a1 KRW |
281 | xen_pcibk_config_free_dyn_fields(found_psdev->dev); |
282 | xen_pcibk_config_reset_dev(found_psdev->dev); | |
30edc14b | 283 | |
31673558 KRW |
284 | xen_unregister_device_domain_owner(found_psdev->dev); |
285 | ||
30edc14b KRW |
286 | spin_lock_irqsave(&found_psdev->lock, flags); |
287 | found_psdev->pdev = NULL; | |
288 | spin_unlock_irqrestore(&found_psdev->lock, flags); | |
289 | ||
290 | pcistub_device_put(found_psdev); | |
291 | up_write(&pcistub_sem); | |
292 | } | |
293 | ||
345a5255 GKH |
294 | static int pcistub_match_one(struct pci_dev *dev, |
295 | struct pcistub_device_id *pdev_id) | |
30edc14b KRW |
296 | { |
297 | /* Match the specified device by domain, bus, slot, func and also if | |
298 | * any of the device's parent bridges match. | |
299 | */ | |
300 | for (; dev != NULL; dev = dev->bus->self) { | |
301 | if (pci_domain_nr(dev->bus) == pdev_id->domain | |
302 | && dev->bus->number == pdev_id->bus | |
303 | && dev->devfn == pdev_id->devfn) | |
304 | return 1; | |
305 | ||
306 | /* Sometimes topmost bridge links to itself. */ | |
307 | if (dev == dev->bus->self) | |
308 | break; | |
309 | } | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
345a5255 | 314 | static int pcistub_match(struct pci_dev *dev) |
30edc14b KRW |
315 | { |
316 | struct pcistub_device_id *pdev_id; | |
317 | unsigned long flags; | |
318 | int found = 0; | |
319 | ||
320 | spin_lock_irqsave(&device_ids_lock, flags); | |
321 | list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) { | |
322 | if (pcistub_match_one(dev, pdev_id)) { | |
323 | found = 1; | |
324 | break; | |
325 | } | |
326 | } | |
327 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
328 | ||
329 | return found; | |
330 | } | |
331 | ||
345a5255 | 332 | static int pcistub_init_device(struct pci_dev *dev) |
30edc14b | 333 | { |
a92336a1 | 334 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
335 | int err = 0; |
336 | ||
337 | dev_dbg(&dev->dev, "initializing...\n"); | |
338 | ||
339 | /* The PCI backend is not intended to be a module (or to work with | |
a92336a1 | 340 | * removable PCI devices (yet). If it were, xen_pcibk_config_free() |
30edc14b KRW |
341 | * would need to be called somewhere to free the memory allocated |
342 | * here and then to call kfree(pci_get_drvdata(psdev->dev)). | |
343 | */ | |
0513fe9e KRW |
344 | dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]") |
345 | + strlen(pci_name(dev)) + 1, GFP_ATOMIC); | |
30edc14b KRW |
346 | if (!dev_data) { |
347 | err = -ENOMEM; | |
348 | goto out; | |
349 | } | |
350 | pci_set_drvdata(dev, dev_data); | |
351 | ||
0513fe9e KRW |
352 | /* |
353 | * Setup name for fake IRQ handler. It will only be enabled | |
354 | * once the device is turned on by the guest. | |
355 | */ | |
356 | sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev)); | |
357 | ||
30edc14b KRW |
358 | dev_dbg(&dev->dev, "initializing config\n"); |
359 | ||
a92336a1 KRW |
360 | init_waitqueue_head(&xen_pcibk_aer_wait_queue); |
361 | err = xen_pcibk_config_init_dev(dev); | |
30edc14b KRW |
362 | if (err) |
363 | goto out; | |
364 | ||
365 | /* HACK: Force device (& ACPI) to determine what IRQ it's on - we | |
366 | * must do this here because pcibios_enable_device may specify | |
367 | * the pci device's true irq (and possibly its other resources) | |
368 | * if they differ from what's in the configuration space. | |
369 | * This makes the assumption that the device's resources won't | |
370 | * change after this point (otherwise this code may break!) | |
371 | */ | |
372 | dev_dbg(&dev->dev, "enabling device\n"); | |
373 | err = pci_enable_device(dev); | |
374 | if (err) | |
375 | goto config_release; | |
376 | ||
d69c0e39 | 377 | if (dev->msix_cap) { |
909b3fdb JB |
378 | struct physdev_pci_device ppdev = { |
379 | .seg = pci_domain_nr(dev->bus), | |
380 | .bus = dev->bus->number, | |
381 | .devfn = dev->devfn | |
382 | }; | |
383 | ||
384 | err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev); | |
385 | if (err) | |
386 | dev_err(&dev->dev, "MSI-X preparation failed (%d)\n", | |
387 | err); | |
388 | } | |
389 | ||
cd9db80e KRW |
390 | /* We need the device active to save the state. */ |
391 | dev_dbg(&dev->dev, "save state of device\n"); | |
392 | pci_save_state(dev); | |
393 | dev_data->pci_saved_state = pci_store_saved_state(dev); | |
394 | if (!dev_data->pci_saved_state) | |
395 | dev_err(&dev->dev, "Could not store PCI conf saved state!\n"); | |
80ba77df | 396 | else { |
744627e9 | 397 | dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n"); |
80ba77df | 398 | __pci_reset_function_locked(dev); |
c341ca45 | 399 | pci_restore_state(dev); |
80ba77df | 400 | } |
30edc14b KRW |
401 | /* Now disable the device (this also ensures some private device |
402 | * data is setup before we export) | |
403 | */ | |
404 | dev_dbg(&dev->dev, "reset device\n"); | |
a92336a1 | 405 | xen_pcibk_reset_device(dev); |
30edc14b | 406 | |
97309d39 | 407 | dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED; |
30edc14b KRW |
408 | return 0; |
409 | ||
410 | config_release: | |
a92336a1 | 411 | xen_pcibk_config_free_dev(dev); |
30edc14b KRW |
412 | |
413 | out: | |
414 | pci_set_drvdata(dev, NULL); | |
415 | kfree(dev_data); | |
416 | return err; | |
417 | } | |
418 | ||
419 | /* | |
420 | * Because some initialization still happens on | |
421 | * devices during fs_initcall, we need to defer | |
422 | * full initialization of our devices until | |
423 | * device_initcall. | |
424 | */ | |
425 | static int __init pcistub_init_devices_late(void) | |
426 | { | |
427 | struct pcistub_device *psdev; | |
428 | unsigned long flags; | |
429 | int err = 0; | |
430 | ||
30edc14b KRW |
431 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
432 | ||
433 | while (!list_empty(&seized_devices)) { | |
434 | psdev = container_of(seized_devices.next, | |
435 | struct pcistub_device, dev_list); | |
436 | list_del(&psdev->dev_list); | |
437 | ||
438 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
439 | ||
440 | err = pcistub_init_device(psdev->dev); | |
441 | if (err) { | |
442 | dev_err(&psdev->dev->dev, | |
443 | "error %d initializing device\n", err); | |
444 | kfree(psdev); | |
445 | psdev = NULL; | |
446 | } | |
447 | ||
448 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
449 | ||
450 | if (psdev) | |
451 | list_add_tail(&psdev->dev_list, &pcistub_devices); | |
452 | } | |
453 | ||
454 | initialize_devices = 1; | |
455 | ||
456 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
345a5255 | 461 | static int pcistub_seize(struct pci_dev *dev) |
30edc14b KRW |
462 | { |
463 | struct pcistub_device *psdev; | |
464 | unsigned long flags; | |
465 | int err = 0; | |
466 | ||
467 | psdev = pcistub_device_alloc(dev); | |
468 | if (!psdev) | |
469 | return -ENOMEM; | |
470 | ||
471 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
472 | ||
473 | if (initialize_devices) { | |
474 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
475 | ||
476 | /* don't want irqs disabled when calling pcistub_init_device */ | |
477 | err = pcistub_init_device(psdev->dev); | |
478 | ||
479 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
480 | ||
481 | if (!err) | |
482 | list_add(&psdev->dev_list, &pcistub_devices); | |
483 | } else { | |
484 | dev_dbg(&dev->dev, "deferring initialization\n"); | |
485 | list_add(&psdev->dev_list, &seized_devices); | |
486 | } | |
487 | ||
488 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
489 | ||
490 | if (err) | |
491 | pcistub_device_put(psdev); | |
492 | ||
493 | return err; | |
494 | } | |
495 | ||
345a5255 | 496 | static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id) |
30edc14b KRW |
497 | { |
498 | int err = 0; | |
499 | ||
500 | dev_dbg(&dev->dev, "probing...\n"); | |
501 | ||
502 | if (pcistub_match(dev)) { | |
503 | ||
504 | if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL | |
505 | && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { | |
506 | dev_err(&dev->dev, "can't export pci devices that " | |
507 | "don't have a normal (0) or bridge (1) " | |
508 | "header type!\n"); | |
509 | err = -ENODEV; | |
510 | goto out; | |
511 | } | |
512 | ||
513 | dev_info(&dev->dev, "seizing device\n"); | |
514 | err = pcistub_seize(dev); | |
515 | } else | |
516 | /* Didn't find the device */ | |
517 | err = -ENODEV; | |
518 | ||
519 | out: | |
520 | return err; | |
521 | } | |
522 | ||
523 | static void pcistub_remove(struct pci_dev *dev) | |
524 | { | |
525 | struct pcistub_device *psdev, *found_psdev = NULL; | |
526 | unsigned long flags; | |
527 | ||
528 | dev_dbg(&dev->dev, "removing\n"); | |
529 | ||
530 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
531 | ||
a92336a1 | 532 | xen_pcibk_config_quirk_release(dev); |
30edc14b KRW |
533 | |
534 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
535 | if (psdev->dev == dev) { | |
536 | found_psdev = psdev; | |
537 | break; | |
538 | } | |
539 | } | |
540 | ||
541 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
542 | ||
543 | if (found_psdev) { | |
544 | dev_dbg(&dev->dev, "found device to remove - in use? %p\n", | |
545 | found_psdev->pdev); | |
546 | ||
547 | if (found_psdev->pdev) { | |
283c0972 | 548 | pr_warn("****** removing device %s while still in-use! ******\n", |
30edc14b | 549 | pci_name(found_psdev->dev)); |
283c0972 JP |
550 | pr_warn("****** driver domain may still access this device's i/o resources!\n"); |
551 | pr_warn("****** shutdown driver domain before binding device\n"); | |
552 | pr_warn("****** to other drivers or domains\n"); | |
30edc14b | 553 | |
a92336a1 | 554 | xen_pcibk_release_pci_dev(found_psdev->pdev, |
30edc14b KRW |
555 | found_psdev->dev); |
556 | } | |
557 | ||
558 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
559 | list_del(&found_psdev->dev_list); | |
560 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
561 | ||
562 | /* the final put for releasing from the list */ | |
563 | pcistub_device_put(found_psdev); | |
564 | } | |
565 | } | |
566 | ||
8bfd4e02 | 567 | static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = { |
30edc14b KRW |
568 | { |
569 | .vendor = PCI_ANY_ID, | |
570 | .device = PCI_ANY_ID, | |
571 | .subvendor = PCI_ANY_ID, | |
572 | .subdevice = PCI_ANY_ID, | |
573 | }, | |
574 | {0,}, | |
575 | }; | |
576 | ||
577 | #define PCI_NODENAME_MAX 40 | |
578 | static void kill_domain_by_device(struct pcistub_device *psdev) | |
579 | { | |
580 | struct xenbus_transaction xbt; | |
581 | int err; | |
582 | char nodename[PCI_NODENAME_MAX]; | |
583 | ||
72bf809a | 584 | BUG_ON(!psdev); |
30edc14b KRW |
585 | snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0", |
586 | psdev->pdev->xdev->otherend_id); | |
30edc14b KRW |
587 | |
588 | again: | |
589 | err = xenbus_transaction_start(&xbt); | |
590 | if (err) { | |
591 | dev_err(&psdev->dev->dev, | |
592 | "error %d when start xenbus transaction\n", err); | |
593 | return; | |
594 | } | |
595 | /*PV AER handlers will set this flag*/ | |
596 | xenbus_printf(xbt, nodename, "aerState" , "aerfail"); | |
597 | err = xenbus_transaction_end(xbt, 0); | |
598 | if (err) { | |
599 | if (err == -EAGAIN) | |
600 | goto again; | |
601 | dev_err(&psdev->dev->dev, | |
602 | "error %d when end xenbus transaction\n", err); | |
603 | return; | |
604 | } | |
605 | } | |
606 | ||
607 | /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and | |
a92336a1 | 608 | * backend need to have cooperation. In xen_pcibk, those steps will do similar |
30edc14b KRW |
609 | * jobs: send service request and waiting for front_end response. |
610 | */ | |
611 | static pci_ers_result_t common_process(struct pcistub_device *psdev, | |
a92336a1 KRW |
612 | pci_channel_state_t state, int aer_cmd, |
613 | pci_ers_result_t result) | |
30edc14b KRW |
614 | { |
615 | pci_ers_result_t res = result; | |
616 | struct xen_pcie_aer_op *aer_op; | |
617 | int ret; | |
618 | ||
619 | /*with PV AER drivers*/ | |
620 | aer_op = &(psdev->pdev->sh_info->aer_op); | |
621 | aer_op->cmd = aer_cmd ; | |
622 | /*useful for error_detected callback*/ | |
623 | aer_op->err = state; | |
624 | /*pcifront_end BDF*/ | |
a92336a1 | 625 | ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev, |
30edc14b KRW |
626 | &aer_op->domain, &aer_op->bus, &aer_op->devfn); |
627 | if (!ret) { | |
628 | dev_err(&psdev->dev->dev, | |
a92336a1 | 629 | DRV_NAME ": failed to get pcifront device\n"); |
30edc14b KRW |
630 | return PCI_ERS_RESULT_NONE; |
631 | } | |
632 | wmb(); | |
633 | ||
634 | dev_dbg(&psdev->dev->dev, | |
a92336a1 | 635 | DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n", |
30edc14b | 636 | aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn); |
a92336a1 KRW |
637 | /*local flag to mark there's aer request, xen_pcibk callback will use |
638 | * this flag to judge whether we need to check pci-front give aer | |
639 | * service ack signal | |
30edc14b KRW |
640 | */ |
641 | set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags); | |
642 | ||
643 | /*It is possible that a pcifront conf_read_write ops request invokes | |
644 | * the callback which cause the spurious execution of wake_up. | |
645 | * Yet it is harmless and better than a spinlock here | |
646 | */ | |
647 | set_bit(_XEN_PCIB_active, | |
648 | (unsigned long *)&psdev->pdev->sh_info->flags); | |
649 | wmb(); | |
650 | notify_remote_via_irq(psdev->pdev->evtchn_irq); | |
651 | ||
a92336a1 KRW |
652 | ret = wait_event_timeout(xen_pcibk_aer_wait_queue, |
653 | !(test_bit(_XEN_PCIB_active, (unsigned long *) | |
654 | &psdev->pdev->sh_info->flags)), 300*HZ); | |
30edc14b KRW |
655 | |
656 | if (!ret) { | |
657 | if (test_bit(_XEN_PCIB_active, | |
658 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
659 | dev_err(&psdev->dev->dev, | |
660 | "pcifront aer process not responding!\n"); | |
661 | clear_bit(_XEN_PCIB_active, | |
662 | (unsigned long *)&psdev->pdev->sh_info->flags); | |
663 | aer_op->err = PCI_ERS_RESULT_NONE; | |
664 | return res; | |
665 | } | |
666 | } | |
667 | clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags); | |
668 | ||
669 | if (test_bit(_XEN_PCIF_active, | |
670 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
671 | dev_dbg(&psdev->dev->dev, | |
402c5e15 | 672 | "schedule pci_conf service in " DRV_NAME "\n"); |
a92336a1 | 673 | xen_pcibk_test_and_schedule_op(psdev->pdev); |
30edc14b KRW |
674 | } |
675 | ||
676 | res = (pci_ers_result_t)aer_op->err; | |
677 | return res; | |
678 | } | |
679 | ||
680 | /* | |
a92336a1 | 681 | * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case |
30edc14b KRW |
682 | * of the device driver could provide this service, and then wait for pcifront |
683 | * ack. | |
684 | * @dev: pointer to PCI devices | |
685 | * return value is used by aer_core do_recovery policy | |
686 | */ | |
a92336a1 | 687 | static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev) |
30edc14b KRW |
688 | { |
689 | struct pcistub_device *psdev; | |
690 | pci_ers_result_t result; | |
691 | ||
692 | result = PCI_ERS_RESULT_RECOVERED; | |
a92336a1 | 693 | dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n", |
30edc14b KRW |
694 | dev->bus->number, dev->devfn); |
695 | ||
696 | down_write(&pcistub_sem); | |
697 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
698 | dev->bus->number, | |
699 | PCI_SLOT(dev->devfn), | |
700 | PCI_FUNC(dev->devfn)); | |
701 | ||
702 | if (!psdev || !psdev->pdev) { | |
703 | dev_err(&dev->dev, | |
a92336a1 | 704 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
705 | goto end; |
706 | } | |
707 | ||
708 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 709 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
710 | " by HVM, kill it\n"); |
711 | kill_domain_by_device(psdev); | |
e6aa70a0 | 712 | goto end; |
30edc14b KRW |
713 | } |
714 | ||
715 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
716 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
717 | dev_err(&dev->dev, | |
718 | "guest with no AER driver should have been killed\n"); | |
e6aa70a0 | 719 | goto end; |
30edc14b KRW |
720 | } |
721 | result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result); | |
722 | ||
723 | if (result == PCI_ERS_RESULT_NONE || | |
724 | result == PCI_ERS_RESULT_DISCONNECT) { | |
725 | dev_dbg(&dev->dev, | |
726 | "No AER slot_reset service or disconnected!\n"); | |
727 | kill_domain_by_device(psdev); | |
728 | } | |
30edc14b | 729 | end: |
e6aa70a0 JB |
730 | if (psdev) |
731 | pcistub_device_put(psdev); | |
30edc14b KRW |
732 | up_write(&pcistub_sem); |
733 | return result; | |
734 | ||
735 | } | |
736 | ||
737 | ||
a92336a1 | 738 | /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront |
30edc14b KRW |
739 | * in case of the device driver could provide this service, and then wait |
740 | * for pcifront ack | |
741 | * @dev: pointer to PCI devices | |
742 | * return value is used by aer_core do_recovery policy | |
743 | */ | |
744 | ||
a92336a1 | 745 | static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev) |
30edc14b KRW |
746 | { |
747 | struct pcistub_device *psdev; | |
748 | pci_ers_result_t result; | |
749 | ||
750 | result = PCI_ERS_RESULT_RECOVERED; | |
a92336a1 | 751 | dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n", |
30edc14b KRW |
752 | dev->bus->number, dev->devfn); |
753 | ||
754 | down_write(&pcistub_sem); | |
755 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
756 | dev->bus->number, | |
757 | PCI_SLOT(dev->devfn), | |
758 | PCI_FUNC(dev->devfn)); | |
759 | ||
760 | if (!psdev || !psdev->pdev) { | |
761 | dev_err(&dev->dev, | |
a92336a1 | 762 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
763 | goto end; |
764 | } | |
765 | ||
766 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 767 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
768 | " by HVM, kill it\n"); |
769 | kill_domain_by_device(psdev); | |
e6aa70a0 | 770 | goto end; |
30edc14b KRW |
771 | } |
772 | ||
773 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
774 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
775 | dev_err(&dev->dev, | |
776 | "guest with no AER driver should have been killed\n"); | |
e6aa70a0 | 777 | goto end; |
30edc14b KRW |
778 | } |
779 | result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result); | |
780 | ||
781 | if (result == PCI_ERS_RESULT_NONE || | |
782 | result == PCI_ERS_RESULT_DISCONNECT) { | |
783 | dev_dbg(&dev->dev, | |
784 | "No AER mmio_enabled service or disconnected!\n"); | |
785 | kill_domain_by_device(psdev); | |
786 | } | |
30edc14b | 787 | end: |
e6aa70a0 JB |
788 | if (psdev) |
789 | pcistub_device_put(psdev); | |
30edc14b KRW |
790 | up_write(&pcistub_sem); |
791 | return result; | |
792 | } | |
793 | ||
a92336a1 | 794 | /*xen_pcibk_error_detected: it will send the error_detected request to pcifront |
30edc14b KRW |
795 | * in case of the device driver could provide this service, and then wait |
796 | * for pcifront ack. | |
797 | * @dev: pointer to PCI devices | |
798 | * @error: the current PCI connection state | |
799 | * return value is used by aer_core do_recovery policy | |
800 | */ | |
801 | ||
a92336a1 | 802 | static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev, |
30edc14b KRW |
803 | pci_channel_state_t error) |
804 | { | |
805 | struct pcistub_device *psdev; | |
806 | pci_ers_result_t result; | |
807 | ||
808 | result = PCI_ERS_RESULT_CAN_RECOVER; | |
a92336a1 | 809 | dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n", |
30edc14b KRW |
810 | dev->bus->number, dev->devfn); |
811 | ||
812 | down_write(&pcistub_sem); | |
813 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
814 | dev->bus->number, | |
815 | PCI_SLOT(dev->devfn), | |
816 | PCI_FUNC(dev->devfn)); | |
817 | ||
818 | if (!psdev || !psdev->pdev) { | |
819 | dev_err(&dev->dev, | |
a92336a1 | 820 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
821 | goto end; |
822 | } | |
823 | ||
824 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 825 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
826 | " by HVM, kill it\n"); |
827 | kill_domain_by_device(psdev); | |
e6aa70a0 | 828 | goto end; |
30edc14b KRW |
829 | } |
830 | ||
831 | /*Guest owns the device yet no aer handler regiested, kill guest*/ | |
832 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
833 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
834 | dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n"); | |
835 | kill_domain_by_device(psdev); | |
e6aa70a0 | 836 | goto end; |
30edc14b KRW |
837 | } |
838 | result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result); | |
839 | ||
840 | if (result == PCI_ERS_RESULT_NONE || | |
841 | result == PCI_ERS_RESULT_DISCONNECT) { | |
842 | dev_dbg(&dev->dev, | |
843 | "No AER error_detected service or disconnected!\n"); | |
844 | kill_domain_by_device(psdev); | |
845 | } | |
30edc14b | 846 | end: |
e6aa70a0 JB |
847 | if (psdev) |
848 | pcistub_device_put(psdev); | |
30edc14b KRW |
849 | up_write(&pcistub_sem); |
850 | return result; | |
851 | } | |
852 | ||
a92336a1 | 853 | /*xen_pcibk_error_resume: it will send the error_resume request to pcifront |
30edc14b KRW |
854 | * in case of the device driver could provide this service, and then wait |
855 | * for pcifront ack. | |
856 | * @dev: pointer to PCI devices | |
857 | */ | |
858 | ||
a92336a1 | 859 | static void xen_pcibk_error_resume(struct pci_dev *dev) |
30edc14b KRW |
860 | { |
861 | struct pcistub_device *psdev; | |
862 | ||
a92336a1 | 863 | dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n", |
30edc14b KRW |
864 | dev->bus->number, dev->devfn); |
865 | ||
866 | down_write(&pcistub_sem); | |
867 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
868 | dev->bus->number, | |
869 | PCI_SLOT(dev->devfn), | |
870 | PCI_FUNC(dev->devfn)); | |
871 | ||
872 | if (!psdev || !psdev->pdev) { | |
873 | dev_err(&dev->dev, | |
a92336a1 | 874 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
875 | goto end; |
876 | } | |
877 | ||
878 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 879 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
880 | " by HVM, kill it\n"); |
881 | kill_domain_by_device(psdev); | |
e6aa70a0 | 882 | goto end; |
30edc14b KRW |
883 | } |
884 | ||
885 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
886 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
887 | dev_err(&dev->dev, | |
888 | "guest with no AER driver should have been killed\n"); | |
889 | kill_domain_by_device(psdev); | |
e6aa70a0 | 890 | goto end; |
30edc14b KRW |
891 | } |
892 | common_process(psdev, 1, XEN_PCI_OP_aer_resume, | |
893 | PCI_ERS_RESULT_RECOVERED); | |
30edc14b | 894 | end: |
e6aa70a0 JB |
895 | if (psdev) |
896 | pcistub_device_put(psdev); | |
30edc14b KRW |
897 | up_write(&pcistub_sem); |
898 | return; | |
899 | } | |
900 | ||
a92336a1 | 901 | /*add xen_pcibk AER handling*/ |
1d352035 | 902 | static const struct pci_error_handlers xen_pcibk_error_handler = { |
a92336a1 KRW |
903 | .error_detected = xen_pcibk_error_detected, |
904 | .mmio_enabled = xen_pcibk_mmio_enabled, | |
905 | .slot_reset = xen_pcibk_slot_reset, | |
906 | .resume = xen_pcibk_error_resume, | |
30edc14b KRW |
907 | }; |
908 | ||
909 | /* | |
910 | * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't | |
911 | * for a normal device. I don't want it to be loaded automatically. | |
912 | */ | |
913 | ||
a92336a1 KRW |
914 | static struct pci_driver xen_pcibk_pci_driver = { |
915 | /* The name should be xen_pciback, but until the tools are updated | |
916 | * we will keep it as pciback. */ | |
917 | .name = "pciback", | |
30edc14b KRW |
918 | .id_table = pcistub_ids, |
919 | .probe = pcistub_probe, | |
920 | .remove = pcistub_remove, | |
a92336a1 | 921 | .err_handler = &xen_pcibk_error_handler, |
30edc14b KRW |
922 | }; |
923 | ||
924 | static inline int str_to_slot(const char *buf, int *domain, int *bus, | |
925 | int *slot, int *func) | |
926 | { | |
5b71fbdc | 927 | int parsed = 0; |
30edc14b | 928 | |
5b71fbdc JB |
929 | switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func, |
930 | &parsed)) { | |
c3cb4709 JB |
931 | case 3: |
932 | *func = -1; | |
5b71fbdc | 933 | sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed); |
c3cb4709 JB |
934 | break; |
935 | case 2: | |
936 | *slot = *func = -1; | |
5b71fbdc | 937 | sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed); |
c3cb4709 JB |
938 | break; |
939 | } | |
5b71fbdc | 940 | if (parsed && !buf[parsed]) |
30edc14b | 941 | return 0; |
30edc14b KRW |
942 | |
943 | /* try again without domain */ | |
944 | *domain = 0; | |
5b71fbdc | 945 | switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) { |
c3cb4709 JB |
946 | case 2: |
947 | *func = -1; | |
5b71fbdc | 948 | sscanf(buf, " %x:%x.* %n", bus, slot, &parsed); |
c3cb4709 JB |
949 | break; |
950 | case 1: | |
951 | *slot = *func = -1; | |
5b71fbdc | 952 | sscanf(buf, " %x:*.* %n", bus, &parsed); |
c3cb4709 JB |
953 | break; |
954 | } | |
5b71fbdc | 955 | if (parsed && !buf[parsed]) |
30edc14b KRW |
956 | return 0; |
957 | ||
958 | return -EINVAL; | |
959 | } | |
960 | ||
961 | static inline int str_to_quirk(const char *buf, int *domain, int *bus, int | |
962 | *slot, int *func, int *reg, int *size, int *mask) | |
963 | { | |
5b71fbdc JB |
964 | int parsed = 0; |
965 | ||
b3e40b72 | 966 | sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func, |
5b71fbdc JB |
967 | reg, size, mask, &parsed); |
968 | if (parsed && !buf[parsed]) | |
969 | return 0; | |
30edc14b | 970 | |
5b71fbdc JB |
971 | /* try again without domain */ |
972 | *domain = 0; | |
b3e40b72 | 973 | sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size, |
5b71fbdc JB |
974 | mask, &parsed); |
975 | if (parsed && !buf[parsed]) | |
30edc14b | 976 | return 0; |
5b71fbdc | 977 | |
30edc14b KRW |
978 | return -EINVAL; |
979 | } | |
980 | ||
981 | static int pcistub_device_id_add(int domain, int bus, int slot, int func) | |
982 | { | |
983 | struct pcistub_device_id *pci_dev_id; | |
984 | unsigned long flags; | |
b3e40b72 | 985 | int rc = 0, devfn = PCI_DEVFN(slot, func); |
c3cb4709 JB |
986 | |
987 | if (slot < 0) { | |
988 | for (slot = 0; !rc && slot < 32; ++slot) | |
989 | rc = pcistub_device_id_add(domain, bus, slot, func); | |
990 | return rc; | |
991 | } | |
992 | ||
993 | if (func < 0) { | |
994 | for (func = 0; !rc && func < 8; ++func) | |
995 | rc = pcistub_device_id_add(domain, bus, slot, func); | |
996 | return rc; | |
997 | } | |
30edc14b | 998 | |
b3e40b72 JB |
999 | if (( |
1000 | #if !defined(MODULE) /* pci_domains_supported is not being exported */ \ | |
1001 | || !defined(CONFIG_PCI_DOMAINS) | |
1002 | !pci_domains_supported ? domain : | |
1003 | #endif | |
1004 | domain < 0 || domain > 0xffff) | |
1005 | || bus < 0 || bus > 0xff | |
1006 | || PCI_SLOT(devfn) != slot | |
1007 | || PCI_FUNC(devfn) != func) | |
1008 | return -EINVAL; | |
1009 | ||
30edc14b KRW |
1010 | pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); |
1011 | if (!pci_dev_id) | |
1012 | return -ENOMEM; | |
1013 | ||
1014 | pci_dev_id->domain = domain; | |
1015 | pci_dev_id->bus = bus; | |
b3e40b72 | 1016 | pci_dev_id->devfn = devfn; |
30edc14b | 1017 | |
283c0972 | 1018 | pr_debug("wants to seize %04x:%02x:%02x.%d\n", |
30edc14b KRW |
1019 | domain, bus, slot, func); |
1020 | ||
1021 | spin_lock_irqsave(&device_ids_lock, flags); | |
1022 | list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids); | |
1023 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | static int pcistub_device_id_remove(int domain, int bus, int slot, int func) | |
1029 | { | |
1030 | struct pcistub_device_id *pci_dev_id, *t; | |
30edc14b KRW |
1031 | int err = -ENOENT; |
1032 | unsigned long flags; | |
1033 | ||
1034 | spin_lock_irqsave(&device_ids_lock, flags); | |
1035 | list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids, | |
1036 | slot_list) { | |
c3cb4709 JB |
1037 | if (pci_dev_id->domain == domain && pci_dev_id->bus == bus |
1038 | && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot) | |
1039 | && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) { | |
30edc14b KRW |
1040 | /* Don't break; here because it's possible the same |
1041 | * slot could be in the list more than once | |
1042 | */ | |
1043 | list_del(&pci_dev_id->slot_list); | |
1044 | kfree(pci_dev_id); | |
1045 | ||
1046 | err = 0; | |
1047 | ||
283c0972 JP |
1048 | pr_debug("removed %04x:%02x:%02x.%d from seize list\n", |
1049 | domain, bus, slot, func); | |
30edc14b KRW |
1050 | } |
1051 | } | |
1052 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1053 | ||
1054 | return err; | |
1055 | } | |
1056 | ||
b3e40b72 JB |
1057 | static int pcistub_reg_add(int domain, int bus, int slot, int func, |
1058 | unsigned int reg, unsigned int size, | |
1059 | unsigned int mask) | |
30edc14b KRW |
1060 | { |
1061 | int err = 0; | |
1062 | struct pcistub_device *psdev; | |
1063 | struct pci_dev *dev; | |
1064 | struct config_field *field; | |
1065 | ||
b3e40b72 JB |
1066 | if (reg > 0xfff || (size < 4 && (mask >> (size * 8)))) |
1067 | return -EINVAL; | |
1068 | ||
30edc14b | 1069 | psdev = pcistub_device_find(domain, bus, slot, func); |
e6aa70a0 | 1070 | if (!psdev) { |
30edc14b KRW |
1071 | err = -ENODEV; |
1072 | goto out; | |
1073 | } | |
1074 | dev = psdev->dev; | |
1075 | ||
1076 | field = kzalloc(sizeof(*field), GFP_ATOMIC); | |
1077 | if (!field) { | |
1078 | err = -ENOMEM; | |
1079 | goto out; | |
1080 | } | |
1081 | ||
1082 | field->offset = reg; | |
1083 | field->size = size; | |
1084 | field->mask = mask; | |
1085 | field->init = NULL; | |
1086 | field->reset = NULL; | |
1087 | field->release = NULL; | |
a92336a1 | 1088 | field->clean = xen_pcibk_config_field_free; |
30edc14b | 1089 | |
a92336a1 | 1090 | err = xen_pcibk_config_quirks_add_field(dev, field); |
30edc14b KRW |
1091 | if (err) |
1092 | kfree(field); | |
1093 | out: | |
e6aa70a0 JB |
1094 | if (psdev) |
1095 | pcistub_device_put(psdev); | |
30edc14b KRW |
1096 | return err; |
1097 | } | |
1098 | ||
1099 | static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf, | |
1100 | size_t count) | |
1101 | { | |
1102 | int domain, bus, slot, func; | |
1103 | int err; | |
1104 | ||
1105 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1106 | if (err) | |
1107 | goto out; | |
1108 | ||
1109 | err = pcistub_device_id_add(domain, bus, slot, func); | |
1110 | ||
1111 | out: | |
1112 | if (!err) | |
1113 | err = count; | |
1114 | return err; | |
1115 | } | |
402c5e15 | 1116 | static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add); |
30edc14b KRW |
1117 | |
1118 | static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf, | |
1119 | size_t count) | |
1120 | { | |
1121 | int domain, bus, slot, func; | |
1122 | int err; | |
1123 | ||
1124 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1125 | if (err) | |
1126 | goto out; | |
1127 | ||
1128 | err = pcistub_device_id_remove(domain, bus, slot, func); | |
1129 | ||
1130 | out: | |
1131 | if (!err) | |
1132 | err = count; | |
1133 | return err; | |
1134 | } | |
402c5e15 | 1135 | static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove); |
30edc14b KRW |
1136 | |
1137 | static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf) | |
1138 | { | |
1139 | struct pcistub_device_id *pci_dev_id; | |
1140 | size_t count = 0; | |
1141 | unsigned long flags; | |
1142 | ||
1143 | spin_lock_irqsave(&device_ids_lock, flags); | |
1144 | list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { | |
1145 | if (count >= PAGE_SIZE) | |
1146 | break; | |
1147 | ||
1148 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
e4de866a | 1149 | "%04x:%02x:%02x.%d\n", |
30edc14b KRW |
1150 | pci_dev_id->domain, pci_dev_id->bus, |
1151 | PCI_SLOT(pci_dev_id->devfn), | |
1152 | PCI_FUNC(pci_dev_id->devfn)); | |
1153 | } | |
1154 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1155 | ||
1156 | return count; | |
1157 | } | |
402c5e15 | 1158 | static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL); |
30edc14b | 1159 | |
0513fe9e KRW |
1160 | static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf) |
1161 | { | |
1162 | struct pcistub_device *psdev; | |
a92336a1 | 1163 | struct xen_pcibk_dev_data *dev_data; |
0513fe9e KRW |
1164 | size_t count = 0; |
1165 | unsigned long flags; | |
1166 | ||
1167 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1168 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1169 | if (count >= PAGE_SIZE) | |
1170 | break; | |
1171 | if (!psdev->dev) | |
1172 | continue; | |
1173 | dev_data = pci_get_drvdata(psdev->dev); | |
1174 | if (!dev_data) | |
1175 | continue; | |
1176 | count += | |
1177 | scnprintf(buf + count, PAGE_SIZE - count, | |
1178 | "%s:%s:%sing:%ld\n", | |
1179 | pci_name(psdev->dev), | |
1180 | dev_data->isr_on ? "on" : "off", | |
1181 | dev_data->ack_intr ? "ack" : "not ack", | |
1182 | dev_data->handled); | |
1183 | } | |
1184 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1185 | return count; | |
1186 | } | |
402c5e15 | 1187 | static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL); |
0513fe9e KRW |
1188 | |
1189 | static ssize_t pcistub_irq_handler_switch(struct device_driver *drv, | |
1190 | const char *buf, | |
1191 | size_t count) | |
1192 | { | |
1193 | struct pcistub_device *psdev; | |
a92336a1 | 1194 | struct xen_pcibk_dev_data *dev_data; |
0513fe9e | 1195 | int domain, bus, slot, func; |
405010df | 1196 | int err; |
0513fe9e KRW |
1197 | |
1198 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1199 | if (err) | |
e6aa70a0 | 1200 | return err; |
0513fe9e KRW |
1201 | |
1202 | psdev = pcistub_device_find(domain, bus, slot, func); | |
405010df WY |
1203 | if (!psdev) { |
1204 | err = -ENOENT; | |
0513fe9e | 1205 | goto out; |
405010df | 1206 | } |
0513fe9e KRW |
1207 | |
1208 | dev_data = pci_get_drvdata(psdev->dev); | |
405010df WY |
1209 | if (!dev_data) { |
1210 | err = -ENOENT; | |
0513fe9e | 1211 | goto out; |
405010df | 1212 | } |
0513fe9e KRW |
1213 | |
1214 | dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n", | |
1215 | dev_data->irq_name, dev_data->isr_on, | |
1216 | !dev_data->isr_on); | |
1217 | ||
1218 | dev_data->isr_on = !(dev_data->isr_on); | |
1219 | if (dev_data->isr_on) | |
1220 | dev_data->ack_intr = 1; | |
1221 | out: | |
e6aa70a0 JB |
1222 | if (psdev) |
1223 | pcistub_device_put(psdev); | |
0513fe9e KRW |
1224 | if (!err) |
1225 | err = count; | |
1226 | return err; | |
1227 | } | |
402c5e15 JB |
1228 | static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL, |
1229 | pcistub_irq_handler_switch); | |
0513fe9e | 1230 | |
30edc14b KRW |
1231 | static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf, |
1232 | size_t count) | |
1233 | { | |
1234 | int domain, bus, slot, func, reg, size, mask; | |
1235 | int err; | |
1236 | ||
1237 | err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size, | |
1238 | &mask); | |
1239 | if (err) | |
1240 | goto out; | |
1241 | ||
1242 | err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask); | |
1243 | ||
1244 | out: | |
1245 | if (!err) | |
1246 | err = count; | |
1247 | return err; | |
1248 | } | |
1249 | ||
1250 | static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf) | |
1251 | { | |
1252 | int count = 0; | |
1253 | unsigned long flags; | |
a92336a1 KRW |
1254 | struct xen_pcibk_config_quirk *quirk; |
1255 | struct xen_pcibk_dev_data *dev_data; | |
30edc14b KRW |
1256 | const struct config_field *field; |
1257 | const struct config_field_entry *cfg_entry; | |
1258 | ||
1259 | spin_lock_irqsave(&device_ids_lock, flags); | |
a92336a1 | 1260 | list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) { |
30edc14b KRW |
1261 | if (count >= PAGE_SIZE) |
1262 | goto out; | |
1263 | ||
1264 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1265 | "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n", | |
1266 | quirk->pdev->bus->number, | |
1267 | PCI_SLOT(quirk->pdev->devfn), | |
1268 | PCI_FUNC(quirk->pdev->devfn), | |
1269 | quirk->devid.vendor, quirk->devid.device, | |
1270 | quirk->devid.subvendor, | |
1271 | quirk->devid.subdevice); | |
1272 | ||
1273 | dev_data = pci_get_drvdata(quirk->pdev); | |
1274 | ||
1275 | list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { | |
1276 | field = cfg_entry->field; | |
1277 | if (count >= PAGE_SIZE) | |
1278 | goto out; | |
1279 | ||
1280 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1281 | "\t\t%08x:%01x:%08x\n", | |
1282 | cfg_entry->base_offset + | |
1283 | field->offset, field->size, | |
1284 | field->mask); | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | out: | |
1289 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1290 | ||
1291 | return count; | |
1292 | } | |
402c5e15 JB |
1293 | static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show, |
1294 | pcistub_quirk_add); | |
30edc14b KRW |
1295 | |
1296 | static ssize_t permissive_add(struct device_driver *drv, const char *buf, | |
1297 | size_t count) | |
1298 | { | |
1299 | int domain, bus, slot, func; | |
1300 | int err; | |
1301 | struct pcistub_device *psdev; | |
a92336a1 | 1302 | struct xen_pcibk_dev_data *dev_data; |
b3e40b72 | 1303 | |
30edc14b KRW |
1304 | err = str_to_slot(buf, &domain, &bus, &slot, &func); |
1305 | if (err) | |
1306 | goto out; | |
b3e40b72 | 1307 | |
30edc14b KRW |
1308 | psdev = pcistub_device_find(domain, bus, slot, func); |
1309 | if (!psdev) { | |
1310 | err = -ENODEV; | |
1311 | goto out; | |
1312 | } | |
e6aa70a0 | 1313 | |
30edc14b KRW |
1314 | dev_data = pci_get_drvdata(psdev->dev); |
1315 | /* the driver data for a device should never be null at this point */ | |
1316 | if (!dev_data) { | |
1317 | err = -ENXIO; | |
1318 | goto release; | |
1319 | } | |
1320 | if (!dev_data->permissive) { | |
1321 | dev_data->permissive = 1; | |
1322 | /* Let user know that what they're doing could be unsafe */ | |
1323 | dev_warn(&psdev->dev->dev, "enabling permissive mode " | |
1324 | "configuration space accesses!\n"); | |
1325 | dev_warn(&psdev->dev->dev, | |
1326 | "permissive mode is potentially unsafe!\n"); | |
1327 | } | |
1328 | release: | |
1329 | pcistub_device_put(psdev); | |
1330 | out: | |
1331 | if (!err) | |
1332 | err = count; | |
1333 | return err; | |
1334 | } | |
1335 | ||
1336 | static ssize_t permissive_show(struct device_driver *drv, char *buf) | |
1337 | { | |
1338 | struct pcistub_device *psdev; | |
a92336a1 | 1339 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
1340 | size_t count = 0; |
1341 | unsigned long flags; | |
1342 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1343 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1344 | if (count >= PAGE_SIZE) | |
1345 | break; | |
1346 | if (!psdev->dev) | |
1347 | continue; | |
1348 | dev_data = pci_get_drvdata(psdev->dev); | |
1349 | if (!dev_data || !dev_data->permissive) | |
1350 | continue; | |
1351 | count += | |
1352 | scnprintf(buf + count, PAGE_SIZE - count, "%s\n", | |
1353 | pci_name(psdev->dev)); | |
1354 | } | |
1355 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1356 | return count; | |
1357 | } | |
402c5e15 JB |
1358 | static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, |
1359 | permissive_add); | |
30edc14b KRW |
1360 | |
1361 | static void pcistub_exit(void) | |
1362 | { | |
a92336a1 KRW |
1363 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot); |
1364 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
30edc14b | 1365 | &driver_attr_remove_slot); |
a92336a1 KRW |
1366 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots); |
1367 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks); | |
1368 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
1369 | &driver_attr_permissive); | |
1370 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
0513fe9e | 1371 | &driver_attr_irq_handlers); |
a92336a1 | 1372 | driver_remove_file(&xen_pcibk_pci_driver.driver, |
0513fe9e | 1373 | &driver_attr_irq_handler_state); |
a92336a1 | 1374 | pci_unregister_driver(&xen_pcibk_pci_driver); |
30edc14b KRW |
1375 | } |
1376 | ||
1377 | static int __init pcistub_init(void) | |
1378 | { | |
1379 | int pos = 0; | |
1380 | int err = 0; | |
1381 | int domain, bus, slot, func; | |
1382 | int parsed; | |
1383 | ||
1384 | if (pci_devs_to_hide && *pci_devs_to_hide) { | |
1385 | do { | |
1386 | parsed = 0; | |
1387 | ||
1388 | err = sscanf(pci_devs_to_hide + pos, | |
1389 | " (%x:%x:%x.%x) %n", | |
1390 | &domain, &bus, &slot, &func, &parsed); | |
c3cb4709 JB |
1391 | switch (err) { |
1392 | case 3: | |
1393 | func = -1; | |
5b71fbdc JB |
1394 | sscanf(pci_devs_to_hide + pos, |
1395 | " (%x:%x:%x.*) %n", | |
1396 | &domain, &bus, &slot, &parsed); | |
c3cb4709 JB |
1397 | break; |
1398 | case 2: | |
1399 | slot = func = -1; | |
5b71fbdc JB |
1400 | sscanf(pci_devs_to_hide + pos, |
1401 | " (%x:%x:*.*) %n", | |
1402 | &domain, &bus, &parsed); | |
c3cb4709 JB |
1403 | break; |
1404 | } | |
1405 | ||
5b71fbdc | 1406 | if (!parsed) { |
30edc14b KRW |
1407 | domain = 0; |
1408 | err = sscanf(pci_devs_to_hide + pos, | |
1409 | " (%x:%x.%x) %n", | |
1410 | &bus, &slot, &func, &parsed); | |
c3cb4709 JB |
1411 | switch (err) { |
1412 | case 2: | |
1413 | func = -1; | |
5b71fbdc JB |
1414 | sscanf(pci_devs_to_hide + pos, |
1415 | " (%x:%x.*) %n", | |
1416 | &bus, &slot, &parsed); | |
c3cb4709 JB |
1417 | break; |
1418 | case 1: | |
1419 | slot = func = -1; | |
5b71fbdc JB |
1420 | sscanf(pci_devs_to_hide + pos, |
1421 | " (%x:*.*) %n", | |
1422 | &bus, &parsed); | |
c3cb4709 JB |
1423 | break; |
1424 | } | |
30edc14b KRW |
1425 | } |
1426 | ||
5b71fbdc JB |
1427 | if (parsed <= 0) |
1428 | goto parse_error; | |
1429 | ||
30edc14b KRW |
1430 | err = pcistub_device_id_add(domain, bus, slot, func); |
1431 | if (err) | |
1432 | goto out; | |
1433 | ||
30edc14b | 1434 | pos += parsed; |
5b71fbdc | 1435 | } while (pci_devs_to_hide[pos]); |
30edc14b KRW |
1436 | } |
1437 | ||
1438 | /* If we're the first PCI Device Driver to register, we're the | |
1439 | * first one to get offered PCI devices as they become | |
1440 | * available (and thus we can be the first to grab them) | |
1441 | */ | |
a92336a1 | 1442 | err = pci_register_driver(&xen_pcibk_pci_driver); |
30edc14b KRW |
1443 | if (err < 0) |
1444 | goto out; | |
1445 | ||
a92336a1 | 1446 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1447 | &driver_attr_new_slot); |
1448 | if (!err) | |
a92336a1 | 1449 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1450 | &driver_attr_remove_slot); |
1451 | if (!err) | |
a92336a1 | 1452 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1453 | &driver_attr_slots); |
1454 | if (!err) | |
a92336a1 | 1455 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1456 | &driver_attr_quirks); |
1457 | if (!err) | |
a92336a1 | 1458 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1459 | &driver_attr_permissive); |
1460 | ||
0513fe9e | 1461 | if (!err) |
a92336a1 | 1462 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
0513fe9e KRW |
1463 | &driver_attr_irq_handlers); |
1464 | if (!err) | |
a92336a1 | 1465 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
0513fe9e | 1466 | &driver_attr_irq_handler_state); |
30edc14b KRW |
1467 | if (err) |
1468 | pcistub_exit(); | |
1469 | ||
1470 | out: | |
1471 | return err; | |
1472 | ||
1473 | parse_error: | |
283c0972 | 1474 | pr_err("Error parsing pci_devs_to_hide at \"%s\"\n", |
30edc14b KRW |
1475 | pci_devs_to_hide + pos); |
1476 | return -EINVAL; | |
1477 | } | |
1478 | ||
1479 | #ifndef MODULE | |
1480 | /* | |
1481 | * fs_initcall happens before device_initcall | |
a92336a1 | 1482 | * so xen_pcibk *should* get called first (b/c we |
30edc14b KRW |
1483 | * want to suck up any device before other drivers |
1484 | * get a chance by being the first pci device | |
1485 | * driver to register) | |
1486 | */ | |
1487 | fs_initcall(pcistub_init); | |
1488 | #endif | |
1489 | ||
a92336a1 | 1490 | static int __init xen_pcibk_init(void) |
30edc14b KRW |
1491 | { |
1492 | int err; | |
1493 | ||
1494 | if (!xen_initial_domain()) | |
1495 | return -ENODEV; | |
1496 | ||
a92336a1 | 1497 | err = xen_pcibk_config_init(); |
30edc14b KRW |
1498 | if (err) |
1499 | return err; | |
1500 | ||
1501 | #ifdef MODULE | |
1502 | err = pcistub_init(); | |
1503 | if (err < 0) | |
1504 | return err; | |
1505 | #endif | |
1506 | ||
1507 | pcistub_init_devices_late(); | |
a92336a1 | 1508 | err = xen_pcibk_xenbus_register(); |
30edc14b KRW |
1509 | if (err) |
1510 | pcistub_exit(); | |
1511 | ||
1512 | return err; | |
1513 | } | |
1514 | ||
a92336a1 | 1515 | static void __exit xen_pcibk_cleanup(void) |
30edc14b | 1516 | { |
a92336a1 | 1517 | xen_pcibk_xenbus_unregister(); |
30edc14b KRW |
1518 | pcistub_exit(); |
1519 | } | |
1520 | ||
a92336a1 KRW |
1521 | module_init(xen_pcibk_init); |
1522 | module_exit(xen_pcibk_cleanup); | |
30edc14b KRW |
1523 | |
1524 | MODULE_LICENSE("Dual BSD/GPL"); | |
402c5e15 | 1525 | MODULE_ALIAS("xen-backend:pci"); |