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 | */ | |
7 | #include <linux/module.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/rwsem.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/kref.h> | |
13 | #include <linux/pci.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/sched.h> | |
8bfd4e02 | 16 | #include <linux/atomic.h> |
30edc14b KRW |
17 | #include <xen/events.h> |
18 | #include <asm/xen/pci.h> | |
19 | #include <asm/xen/hypervisor.h> | |
20 | #include "pciback.h" | |
21 | #include "conf_space.h" | |
22 | #include "conf_space_quirks.h" | |
23 | ||
24 | static char *pci_devs_to_hide; | |
a92336a1 KRW |
25 | wait_queue_head_t xen_pcibk_aer_wait_queue; |
26 | /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops, | |
27 | * We want to avoid in middle of AER ops, xen_pcibk devices is being removed | |
30edc14b KRW |
28 | */ |
29 | static DECLARE_RWSEM(pcistub_sem); | |
30 | module_param_named(hide, pci_devs_to_hide, charp, 0444); | |
31 | ||
32 | struct pcistub_device_id { | |
33 | struct list_head slot_list; | |
34 | int domain; | |
35 | unsigned char bus; | |
36 | unsigned int devfn; | |
37 | }; | |
38 | static LIST_HEAD(pcistub_device_ids); | |
39 | static DEFINE_SPINLOCK(device_ids_lock); | |
40 | ||
41 | struct pcistub_device { | |
42 | struct kref kref; | |
43 | struct list_head dev_list; | |
44 | spinlock_t lock; | |
45 | ||
46 | struct pci_dev *dev; | |
a92336a1 | 47 | struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */ |
30edc14b KRW |
48 | }; |
49 | ||
50 | /* Access to pcistub_devices & seized_devices lists and the initialize_devices | |
51 | * flag must be locked with pcistub_devices_lock | |
52 | */ | |
53 | static DEFINE_SPINLOCK(pcistub_devices_lock); | |
54 | static LIST_HEAD(pcistub_devices); | |
55 | ||
56 | /* wait for device_initcall before initializing our devices | |
57 | * (see pcistub_init_devices_late) | |
58 | */ | |
59 | static int initialize_devices; | |
60 | static LIST_HEAD(seized_devices); | |
61 | ||
62 | static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev) | |
63 | { | |
64 | struct pcistub_device *psdev; | |
65 | ||
66 | dev_dbg(&dev->dev, "pcistub_device_alloc\n"); | |
67 | ||
68 | psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC); | |
69 | if (!psdev) | |
70 | return NULL; | |
71 | ||
72 | psdev->dev = pci_dev_get(dev); | |
73 | if (!psdev->dev) { | |
74 | kfree(psdev); | |
75 | return NULL; | |
76 | } | |
77 | ||
78 | kref_init(&psdev->kref); | |
79 | spin_lock_init(&psdev->lock); | |
80 | ||
81 | return psdev; | |
82 | } | |
83 | ||
84 | /* Don't call this directly as it's called by pcistub_device_put */ | |
85 | static void pcistub_device_release(struct kref *kref) | |
86 | { | |
87 | struct pcistub_device *psdev; | |
cd9db80e | 88 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
89 | |
90 | psdev = container_of(kref, struct pcistub_device, kref); | |
cd9db80e | 91 | dev_data = pci_get_drvdata(psdev->dev); |
30edc14b KRW |
92 | |
93 | dev_dbg(&psdev->dev->dev, "pcistub_device_release\n"); | |
94 | ||
6221a9b2 KRW |
95 | xen_unregister_device_domain_owner(psdev->dev); |
96 | ||
cd9db80e KRW |
97 | /* Call the reset function which does not take lock as this |
98 | * is called from "unbind" which takes a device_lock mutex. | |
99 | */ | |
100 | __pci_reset_function_locked(psdev->dev); | |
101 | if (pci_load_and_free_saved_state(psdev->dev, | |
102 | &dev_data->pci_saved_state)) { | |
103 | dev_dbg(&psdev->dev->dev, "Could not reload PCI state\n"); | |
104 | } else | |
105 | pci_restore_state(psdev->dev); | |
106 | ||
107 | /* Disable the device */ | |
a92336a1 | 108 | xen_pcibk_reset_device(psdev->dev); |
cd9db80e KRW |
109 | |
110 | kfree(dev_data); | |
111 | pci_set_drvdata(psdev->dev, NULL); | |
112 | ||
113 | /* Clean-up the device */ | |
a92336a1 KRW |
114 | xen_pcibk_config_free_dyn_fields(psdev->dev); |
115 | xen_pcibk_config_free_dev(psdev->dev); | |
30edc14b | 116 | |
97309d39 | 117 | psdev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED; |
30edc14b KRW |
118 | pci_dev_put(psdev->dev); |
119 | ||
120 | kfree(psdev); | |
121 | } | |
122 | ||
123 | static inline void pcistub_device_get(struct pcistub_device *psdev) | |
124 | { | |
125 | kref_get(&psdev->kref); | |
126 | } | |
127 | ||
128 | static inline void pcistub_device_put(struct pcistub_device *psdev) | |
129 | { | |
130 | kref_put(&psdev->kref, pcistub_device_release); | |
131 | } | |
132 | ||
133 | static struct pcistub_device *pcistub_device_find(int domain, int bus, | |
134 | int slot, int func) | |
135 | { | |
136 | struct pcistub_device *psdev = NULL; | |
137 | unsigned long flags; | |
138 | ||
139 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
140 | ||
141 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
142 | if (psdev->dev != NULL | |
143 | && domain == pci_domain_nr(psdev->dev->bus) | |
144 | && bus == psdev->dev->bus->number | |
145 | && PCI_DEVFN(slot, func) == psdev->dev->devfn) { | |
146 | pcistub_device_get(psdev); | |
147 | goto out; | |
148 | } | |
149 | } | |
150 | ||
151 | /* didn't find it */ | |
152 | psdev = NULL; | |
153 | ||
154 | out: | |
155 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
156 | return psdev; | |
157 | } | |
158 | ||
a92336a1 | 159 | static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev, |
30edc14b KRW |
160 | struct pcistub_device *psdev) |
161 | { | |
162 | struct pci_dev *pci_dev = NULL; | |
163 | unsigned long flags; | |
164 | ||
165 | pcistub_device_get(psdev); | |
166 | ||
167 | spin_lock_irqsave(&psdev->lock, flags); | |
168 | if (!psdev->pdev) { | |
169 | psdev->pdev = pdev; | |
170 | pci_dev = psdev->dev; | |
171 | } | |
172 | spin_unlock_irqrestore(&psdev->lock, flags); | |
173 | ||
174 | if (!pci_dev) | |
175 | pcistub_device_put(psdev); | |
176 | ||
177 | return pci_dev; | |
178 | } | |
179 | ||
a92336a1 | 180 | struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, |
30edc14b KRW |
181 | int domain, int bus, |
182 | int slot, int func) | |
183 | { | |
184 | struct pcistub_device *psdev; | |
185 | struct pci_dev *found_dev = NULL; | |
186 | unsigned long flags; | |
187 | ||
188 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
189 | ||
190 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
191 | if (psdev->dev != NULL | |
192 | && domain == pci_domain_nr(psdev->dev->bus) | |
193 | && bus == psdev->dev->bus->number | |
194 | && PCI_DEVFN(slot, func) == psdev->dev->devfn) { | |
195 | found_dev = pcistub_device_get_pci_dev(pdev, psdev); | |
196 | break; | |
197 | } | |
198 | } | |
199 | ||
200 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
201 | return found_dev; | |
202 | } | |
203 | ||
a92336a1 | 204 | struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev, |
30edc14b KRW |
205 | struct pci_dev *dev) |
206 | { | |
207 | struct pcistub_device *psdev; | |
208 | struct pci_dev *found_dev = NULL; | |
209 | unsigned long flags; | |
210 | ||
211 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
212 | ||
213 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
214 | if (psdev->dev == dev) { | |
215 | found_dev = pcistub_device_get_pci_dev(pdev, psdev); | |
216 | break; | |
217 | } | |
218 | } | |
219 | ||
220 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
221 | return found_dev; | |
222 | } | |
223 | ||
224 | void pcistub_put_pci_dev(struct pci_dev *dev) | |
225 | { | |
226 | struct pcistub_device *psdev, *found_psdev = NULL; | |
227 | unsigned long flags; | |
228 | ||
229 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
230 | ||
231 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
232 | if (psdev->dev == dev) { | |
233 | found_psdev = psdev; | |
234 | break; | |
235 | } | |
236 | } | |
237 | ||
238 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
4645bf30 KRW |
239 | if (WARN_ON(!found_psdev)) |
240 | return; | |
30edc14b KRW |
241 | |
242 | /*hold this lock for avoiding breaking link between | |
a92336a1 | 243 | * pcistub and xen_pcibk when AER is in processing |
30edc14b KRW |
244 | */ |
245 | down_write(&pcistub_sem); | |
246 | /* Cleanup our device | |
247 | * (so it's ready for the next domain) | |
248 | */ | |
cd9db80e KRW |
249 | |
250 | /* This is OK - we are running from workqueue context | |
251 | * and want to inhibit the user from fiddling with 'reset' | |
252 | */ | |
253 | pci_reset_function(dev); | |
254 | pci_restore_state(psdev->dev); | |
255 | ||
256 | /* This disables the device. */ | |
a92336a1 | 257 | xen_pcibk_reset_device(found_psdev->dev); |
cd9db80e KRW |
258 | |
259 | /* And cleanup up our emulated fields. */ | |
a92336a1 KRW |
260 | xen_pcibk_config_free_dyn_fields(found_psdev->dev); |
261 | xen_pcibk_config_reset_dev(found_psdev->dev); | |
30edc14b | 262 | |
31673558 KRW |
263 | xen_unregister_device_domain_owner(found_psdev->dev); |
264 | ||
30edc14b KRW |
265 | spin_lock_irqsave(&found_psdev->lock, flags); |
266 | found_psdev->pdev = NULL; | |
267 | spin_unlock_irqrestore(&found_psdev->lock, flags); | |
268 | ||
269 | pcistub_device_put(found_psdev); | |
270 | up_write(&pcistub_sem); | |
271 | } | |
272 | ||
273 | static int __devinit pcistub_match_one(struct pci_dev *dev, | |
274 | struct pcistub_device_id *pdev_id) | |
275 | { | |
276 | /* Match the specified device by domain, bus, slot, func and also if | |
277 | * any of the device's parent bridges match. | |
278 | */ | |
279 | for (; dev != NULL; dev = dev->bus->self) { | |
280 | if (pci_domain_nr(dev->bus) == pdev_id->domain | |
281 | && dev->bus->number == pdev_id->bus | |
282 | && dev->devfn == pdev_id->devfn) | |
283 | return 1; | |
284 | ||
285 | /* Sometimes topmost bridge links to itself. */ | |
286 | if (dev == dev->bus->self) | |
287 | break; | |
288 | } | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static int __devinit pcistub_match(struct pci_dev *dev) | |
294 | { | |
295 | struct pcistub_device_id *pdev_id; | |
296 | unsigned long flags; | |
297 | int found = 0; | |
298 | ||
299 | spin_lock_irqsave(&device_ids_lock, flags); | |
300 | list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) { | |
301 | if (pcistub_match_one(dev, pdev_id)) { | |
302 | found = 1; | |
303 | break; | |
304 | } | |
305 | } | |
306 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
307 | ||
308 | return found; | |
309 | } | |
310 | ||
311 | static int __devinit pcistub_init_device(struct pci_dev *dev) | |
312 | { | |
a92336a1 | 313 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
314 | int err = 0; |
315 | ||
316 | dev_dbg(&dev->dev, "initializing...\n"); | |
317 | ||
318 | /* The PCI backend is not intended to be a module (or to work with | |
a92336a1 | 319 | * removable PCI devices (yet). If it were, xen_pcibk_config_free() |
30edc14b KRW |
320 | * would need to be called somewhere to free the memory allocated |
321 | * here and then to call kfree(pci_get_drvdata(psdev->dev)). | |
322 | */ | |
0513fe9e KRW |
323 | dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]") |
324 | + strlen(pci_name(dev)) + 1, GFP_ATOMIC); | |
30edc14b KRW |
325 | if (!dev_data) { |
326 | err = -ENOMEM; | |
327 | goto out; | |
328 | } | |
329 | pci_set_drvdata(dev, dev_data); | |
330 | ||
0513fe9e KRW |
331 | /* |
332 | * Setup name for fake IRQ handler. It will only be enabled | |
333 | * once the device is turned on by the guest. | |
334 | */ | |
335 | sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev)); | |
336 | ||
30edc14b KRW |
337 | dev_dbg(&dev->dev, "initializing config\n"); |
338 | ||
a92336a1 KRW |
339 | init_waitqueue_head(&xen_pcibk_aer_wait_queue); |
340 | err = xen_pcibk_config_init_dev(dev); | |
30edc14b KRW |
341 | if (err) |
342 | goto out; | |
343 | ||
344 | /* HACK: Force device (& ACPI) to determine what IRQ it's on - we | |
345 | * must do this here because pcibios_enable_device may specify | |
346 | * the pci device's true irq (and possibly its other resources) | |
347 | * if they differ from what's in the configuration space. | |
348 | * This makes the assumption that the device's resources won't | |
349 | * change after this point (otherwise this code may break!) | |
350 | */ | |
351 | dev_dbg(&dev->dev, "enabling device\n"); | |
352 | err = pci_enable_device(dev); | |
353 | if (err) | |
354 | goto config_release; | |
355 | ||
cd9db80e KRW |
356 | /* We need the device active to save the state. */ |
357 | dev_dbg(&dev->dev, "save state of device\n"); | |
358 | pci_save_state(dev); | |
359 | dev_data->pci_saved_state = pci_store_saved_state(dev); | |
360 | if (!dev_data->pci_saved_state) | |
361 | dev_err(&dev->dev, "Could not store PCI conf saved state!\n"); | |
80ba77df KRW |
362 | else { |
363 | dev_dbg(&dev->dev, "reseting (FLR, D3, etc) the device\n"); | |
364 | __pci_reset_function_locked(dev); | |
c341ca45 | 365 | pci_restore_state(dev); |
80ba77df | 366 | } |
30edc14b KRW |
367 | /* Now disable the device (this also ensures some private device |
368 | * data is setup before we export) | |
369 | */ | |
370 | dev_dbg(&dev->dev, "reset device\n"); | |
a92336a1 | 371 | xen_pcibk_reset_device(dev); |
30edc14b | 372 | |
97309d39 | 373 | dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED; |
30edc14b KRW |
374 | return 0; |
375 | ||
376 | config_release: | |
a92336a1 | 377 | xen_pcibk_config_free_dev(dev); |
30edc14b KRW |
378 | |
379 | out: | |
380 | pci_set_drvdata(dev, NULL); | |
381 | kfree(dev_data); | |
382 | return err; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Because some initialization still happens on | |
387 | * devices during fs_initcall, we need to defer | |
388 | * full initialization of our devices until | |
389 | * device_initcall. | |
390 | */ | |
391 | static int __init pcistub_init_devices_late(void) | |
392 | { | |
393 | struct pcistub_device *psdev; | |
394 | unsigned long flags; | |
395 | int err = 0; | |
396 | ||
a92336a1 | 397 | pr_debug(DRV_NAME ": pcistub_init_devices_late\n"); |
30edc14b KRW |
398 | |
399 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
400 | ||
401 | while (!list_empty(&seized_devices)) { | |
402 | psdev = container_of(seized_devices.next, | |
403 | struct pcistub_device, dev_list); | |
404 | list_del(&psdev->dev_list); | |
405 | ||
406 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
407 | ||
408 | err = pcistub_init_device(psdev->dev); | |
409 | if (err) { | |
410 | dev_err(&psdev->dev->dev, | |
411 | "error %d initializing device\n", err); | |
412 | kfree(psdev); | |
413 | psdev = NULL; | |
414 | } | |
415 | ||
416 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
417 | ||
418 | if (psdev) | |
419 | list_add_tail(&psdev->dev_list, &pcistub_devices); | |
420 | } | |
421 | ||
422 | initialize_devices = 1; | |
423 | ||
424 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | static int __devinit pcistub_seize(struct pci_dev *dev) | |
430 | { | |
431 | struct pcistub_device *psdev; | |
432 | unsigned long flags; | |
433 | int err = 0; | |
434 | ||
435 | psdev = pcistub_device_alloc(dev); | |
436 | if (!psdev) | |
437 | return -ENOMEM; | |
438 | ||
439 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
440 | ||
441 | if (initialize_devices) { | |
442 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
443 | ||
444 | /* don't want irqs disabled when calling pcistub_init_device */ | |
445 | err = pcistub_init_device(psdev->dev); | |
446 | ||
447 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
448 | ||
449 | if (!err) | |
450 | list_add(&psdev->dev_list, &pcistub_devices); | |
451 | } else { | |
452 | dev_dbg(&dev->dev, "deferring initialization\n"); | |
453 | list_add(&psdev->dev_list, &seized_devices); | |
454 | } | |
455 | ||
456 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
457 | ||
458 | if (err) | |
459 | pcistub_device_put(psdev); | |
460 | ||
461 | return err; | |
462 | } | |
463 | ||
464 | static int __devinit pcistub_probe(struct pci_dev *dev, | |
465 | const struct pci_device_id *id) | |
466 | { | |
467 | int err = 0; | |
468 | ||
469 | dev_dbg(&dev->dev, "probing...\n"); | |
470 | ||
471 | if (pcistub_match(dev)) { | |
472 | ||
473 | if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL | |
474 | && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { | |
475 | dev_err(&dev->dev, "can't export pci devices that " | |
476 | "don't have a normal (0) or bridge (1) " | |
477 | "header type!\n"); | |
478 | err = -ENODEV; | |
479 | goto out; | |
480 | } | |
481 | ||
482 | dev_info(&dev->dev, "seizing device\n"); | |
483 | err = pcistub_seize(dev); | |
484 | } else | |
485 | /* Didn't find the device */ | |
486 | err = -ENODEV; | |
487 | ||
488 | out: | |
489 | return err; | |
490 | } | |
491 | ||
492 | static void pcistub_remove(struct pci_dev *dev) | |
493 | { | |
494 | struct pcistub_device *psdev, *found_psdev = NULL; | |
495 | unsigned long flags; | |
496 | ||
497 | dev_dbg(&dev->dev, "removing\n"); | |
498 | ||
499 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
500 | ||
a92336a1 | 501 | xen_pcibk_config_quirk_release(dev); |
30edc14b KRW |
502 | |
503 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
504 | if (psdev->dev == dev) { | |
505 | found_psdev = psdev; | |
506 | break; | |
507 | } | |
508 | } | |
509 | ||
510 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
511 | ||
512 | if (found_psdev) { | |
513 | dev_dbg(&dev->dev, "found device to remove - in use? %p\n", | |
514 | found_psdev->pdev); | |
515 | ||
516 | if (found_psdev->pdev) { | |
a92336a1 | 517 | printk(KERN_WARNING DRV_NAME ": ****** removing device " |
30edc14b KRW |
518 | "%s while still in-use! ******\n", |
519 | pci_name(found_psdev->dev)); | |
a92336a1 KRW |
520 | printk(KERN_WARNING DRV_NAME ": ****** driver domain may" |
521 | " still access this device's i/o resources!\n"); | |
522 | printk(KERN_WARNING DRV_NAME ": ****** shutdown driver " | |
30edc14b | 523 | "domain before binding device\n"); |
a92336a1 | 524 | printk(KERN_WARNING DRV_NAME ": ****** to other drivers " |
30edc14b KRW |
525 | "or domains\n"); |
526 | ||
a92336a1 | 527 | xen_pcibk_release_pci_dev(found_psdev->pdev, |
30edc14b KRW |
528 | found_psdev->dev); |
529 | } | |
530 | ||
531 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
532 | list_del(&found_psdev->dev_list); | |
533 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
534 | ||
535 | /* the final put for releasing from the list */ | |
536 | pcistub_device_put(found_psdev); | |
537 | } | |
538 | } | |
539 | ||
8bfd4e02 | 540 | static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = { |
30edc14b KRW |
541 | { |
542 | .vendor = PCI_ANY_ID, | |
543 | .device = PCI_ANY_ID, | |
544 | .subvendor = PCI_ANY_ID, | |
545 | .subdevice = PCI_ANY_ID, | |
546 | }, | |
547 | {0,}, | |
548 | }; | |
549 | ||
550 | #define PCI_NODENAME_MAX 40 | |
551 | static void kill_domain_by_device(struct pcistub_device *psdev) | |
552 | { | |
553 | struct xenbus_transaction xbt; | |
554 | int err; | |
555 | char nodename[PCI_NODENAME_MAX]; | |
556 | ||
72bf809a | 557 | BUG_ON(!psdev); |
30edc14b KRW |
558 | snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0", |
559 | psdev->pdev->xdev->otherend_id); | |
30edc14b KRW |
560 | |
561 | again: | |
562 | err = xenbus_transaction_start(&xbt); | |
563 | if (err) { | |
564 | dev_err(&psdev->dev->dev, | |
565 | "error %d when start xenbus transaction\n", err); | |
566 | return; | |
567 | } | |
568 | /*PV AER handlers will set this flag*/ | |
569 | xenbus_printf(xbt, nodename, "aerState" , "aerfail"); | |
570 | err = xenbus_transaction_end(xbt, 0); | |
571 | if (err) { | |
572 | if (err == -EAGAIN) | |
573 | goto again; | |
574 | dev_err(&psdev->dev->dev, | |
575 | "error %d when end xenbus transaction\n", err); | |
576 | return; | |
577 | } | |
578 | } | |
579 | ||
580 | /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and | |
a92336a1 | 581 | * backend need to have cooperation. In xen_pcibk, those steps will do similar |
30edc14b KRW |
582 | * jobs: send service request and waiting for front_end response. |
583 | */ | |
584 | static pci_ers_result_t common_process(struct pcistub_device *psdev, | |
a92336a1 KRW |
585 | pci_channel_state_t state, int aer_cmd, |
586 | pci_ers_result_t result) | |
30edc14b KRW |
587 | { |
588 | pci_ers_result_t res = result; | |
589 | struct xen_pcie_aer_op *aer_op; | |
590 | int ret; | |
591 | ||
592 | /*with PV AER drivers*/ | |
593 | aer_op = &(psdev->pdev->sh_info->aer_op); | |
594 | aer_op->cmd = aer_cmd ; | |
595 | /*useful for error_detected callback*/ | |
596 | aer_op->err = state; | |
597 | /*pcifront_end BDF*/ | |
a92336a1 | 598 | ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev, |
30edc14b KRW |
599 | &aer_op->domain, &aer_op->bus, &aer_op->devfn); |
600 | if (!ret) { | |
601 | dev_err(&psdev->dev->dev, | |
a92336a1 | 602 | DRV_NAME ": failed to get pcifront device\n"); |
30edc14b KRW |
603 | return PCI_ERS_RESULT_NONE; |
604 | } | |
605 | wmb(); | |
606 | ||
607 | dev_dbg(&psdev->dev->dev, | |
a92336a1 | 608 | DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n", |
30edc14b | 609 | aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn); |
a92336a1 KRW |
610 | /*local flag to mark there's aer request, xen_pcibk callback will use |
611 | * this flag to judge whether we need to check pci-front give aer | |
612 | * service ack signal | |
30edc14b KRW |
613 | */ |
614 | set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags); | |
615 | ||
616 | /*It is possible that a pcifront conf_read_write ops request invokes | |
617 | * the callback which cause the spurious execution of wake_up. | |
618 | * Yet it is harmless and better than a spinlock here | |
619 | */ | |
620 | set_bit(_XEN_PCIB_active, | |
621 | (unsigned long *)&psdev->pdev->sh_info->flags); | |
622 | wmb(); | |
623 | notify_remote_via_irq(psdev->pdev->evtchn_irq); | |
624 | ||
a92336a1 KRW |
625 | ret = wait_event_timeout(xen_pcibk_aer_wait_queue, |
626 | !(test_bit(_XEN_PCIB_active, (unsigned long *) | |
627 | &psdev->pdev->sh_info->flags)), 300*HZ); | |
30edc14b KRW |
628 | |
629 | if (!ret) { | |
630 | if (test_bit(_XEN_PCIB_active, | |
631 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
632 | dev_err(&psdev->dev->dev, | |
633 | "pcifront aer process not responding!\n"); | |
634 | clear_bit(_XEN_PCIB_active, | |
635 | (unsigned long *)&psdev->pdev->sh_info->flags); | |
636 | aer_op->err = PCI_ERS_RESULT_NONE; | |
637 | return res; | |
638 | } | |
639 | } | |
640 | clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags); | |
641 | ||
642 | if (test_bit(_XEN_PCIF_active, | |
643 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
644 | dev_dbg(&psdev->dev->dev, | |
402c5e15 | 645 | "schedule pci_conf service in " DRV_NAME "\n"); |
a92336a1 | 646 | xen_pcibk_test_and_schedule_op(psdev->pdev); |
30edc14b KRW |
647 | } |
648 | ||
649 | res = (pci_ers_result_t)aer_op->err; | |
650 | return res; | |
651 | } | |
652 | ||
653 | /* | |
a92336a1 | 654 | * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case |
30edc14b KRW |
655 | * of the device driver could provide this service, and then wait for pcifront |
656 | * ack. | |
657 | * @dev: pointer to PCI devices | |
658 | * return value is used by aer_core do_recovery policy | |
659 | */ | |
a92336a1 | 660 | static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev) |
30edc14b KRW |
661 | { |
662 | struct pcistub_device *psdev; | |
663 | pci_ers_result_t result; | |
664 | ||
665 | result = PCI_ERS_RESULT_RECOVERED; | |
a92336a1 | 666 | dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n", |
30edc14b KRW |
667 | dev->bus->number, dev->devfn); |
668 | ||
669 | down_write(&pcistub_sem); | |
670 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
671 | dev->bus->number, | |
672 | PCI_SLOT(dev->devfn), | |
673 | PCI_FUNC(dev->devfn)); | |
674 | ||
675 | if (!psdev || !psdev->pdev) { | |
676 | dev_err(&dev->dev, | |
a92336a1 | 677 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
678 | goto end; |
679 | } | |
680 | ||
681 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 682 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
683 | " by HVM, kill it\n"); |
684 | kill_domain_by_device(psdev); | |
e6aa70a0 | 685 | goto end; |
30edc14b KRW |
686 | } |
687 | ||
688 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
689 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
690 | dev_err(&dev->dev, | |
691 | "guest with no AER driver should have been killed\n"); | |
e6aa70a0 | 692 | goto end; |
30edc14b KRW |
693 | } |
694 | result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result); | |
695 | ||
696 | if (result == PCI_ERS_RESULT_NONE || | |
697 | result == PCI_ERS_RESULT_DISCONNECT) { | |
698 | dev_dbg(&dev->dev, | |
699 | "No AER slot_reset service or disconnected!\n"); | |
700 | kill_domain_by_device(psdev); | |
701 | } | |
30edc14b | 702 | end: |
e6aa70a0 JB |
703 | if (psdev) |
704 | pcistub_device_put(psdev); | |
30edc14b KRW |
705 | up_write(&pcistub_sem); |
706 | return result; | |
707 | ||
708 | } | |
709 | ||
710 | ||
a92336a1 | 711 | /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront |
30edc14b KRW |
712 | * in case of the device driver could provide this service, and then wait |
713 | * for pcifront ack | |
714 | * @dev: pointer to PCI devices | |
715 | * return value is used by aer_core do_recovery policy | |
716 | */ | |
717 | ||
a92336a1 | 718 | static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev) |
30edc14b KRW |
719 | { |
720 | struct pcistub_device *psdev; | |
721 | pci_ers_result_t result; | |
722 | ||
723 | result = PCI_ERS_RESULT_RECOVERED; | |
a92336a1 | 724 | dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n", |
30edc14b KRW |
725 | dev->bus->number, dev->devfn); |
726 | ||
727 | down_write(&pcistub_sem); | |
728 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
729 | dev->bus->number, | |
730 | PCI_SLOT(dev->devfn), | |
731 | PCI_FUNC(dev->devfn)); | |
732 | ||
733 | if (!psdev || !psdev->pdev) { | |
734 | dev_err(&dev->dev, | |
a92336a1 | 735 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
736 | goto end; |
737 | } | |
738 | ||
739 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 740 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
741 | " by HVM, kill it\n"); |
742 | kill_domain_by_device(psdev); | |
e6aa70a0 | 743 | goto end; |
30edc14b KRW |
744 | } |
745 | ||
746 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
747 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
748 | dev_err(&dev->dev, | |
749 | "guest with no AER driver should have been killed\n"); | |
e6aa70a0 | 750 | goto end; |
30edc14b KRW |
751 | } |
752 | result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result); | |
753 | ||
754 | if (result == PCI_ERS_RESULT_NONE || | |
755 | result == PCI_ERS_RESULT_DISCONNECT) { | |
756 | dev_dbg(&dev->dev, | |
757 | "No AER mmio_enabled service or disconnected!\n"); | |
758 | kill_domain_by_device(psdev); | |
759 | } | |
30edc14b | 760 | end: |
e6aa70a0 JB |
761 | if (psdev) |
762 | pcistub_device_put(psdev); | |
30edc14b KRW |
763 | up_write(&pcistub_sem); |
764 | return result; | |
765 | } | |
766 | ||
a92336a1 | 767 | /*xen_pcibk_error_detected: it will send the error_detected request to pcifront |
30edc14b KRW |
768 | * in case of the device driver could provide this service, and then wait |
769 | * for pcifront ack. | |
770 | * @dev: pointer to PCI devices | |
771 | * @error: the current PCI connection state | |
772 | * return value is used by aer_core do_recovery policy | |
773 | */ | |
774 | ||
a92336a1 | 775 | static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev, |
30edc14b KRW |
776 | pci_channel_state_t error) |
777 | { | |
778 | struct pcistub_device *psdev; | |
779 | pci_ers_result_t result; | |
780 | ||
781 | result = PCI_ERS_RESULT_CAN_RECOVER; | |
a92336a1 | 782 | dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n", |
30edc14b KRW |
783 | dev->bus->number, dev->devfn); |
784 | ||
785 | down_write(&pcistub_sem); | |
786 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
787 | dev->bus->number, | |
788 | PCI_SLOT(dev->devfn), | |
789 | PCI_FUNC(dev->devfn)); | |
790 | ||
791 | if (!psdev || !psdev->pdev) { | |
792 | dev_err(&dev->dev, | |
a92336a1 | 793 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
794 | goto end; |
795 | } | |
796 | ||
797 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 798 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
799 | " by HVM, kill it\n"); |
800 | kill_domain_by_device(psdev); | |
e6aa70a0 | 801 | goto end; |
30edc14b KRW |
802 | } |
803 | ||
804 | /*Guest owns the device yet no aer handler regiested, kill guest*/ | |
805 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
806 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
807 | dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n"); | |
808 | kill_domain_by_device(psdev); | |
e6aa70a0 | 809 | goto end; |
30edc14b KRW |
810 | } |
811 | result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result); | |
812 | ||
813 | if (result == PCI_ERS_RESULT_NONE || | |
814 | result == PCI_ERS_RESULT_DISCONNECT) { | |
815 | dev_dbg(&dev->dev, | |
816 | "No AER error_detected service or disconnected!\n"); | |
817 | kill_domain_by_device(psdev); | |
818 | } | |
30edc14b | 819 | end: |
e6aa70a0 JB |
820 | if (psdev) |
821 | pcistub_device_put(psdev); | |
30edc14b KRW |
822 | up_write(&pcistub_sem); |
823 | return result; | |
824 | } | |
825 | ||
a92336a1 | 826 | /*xen_pcibk_error_resume: it will send the error_resume request to pcifront |
30edc14b KRW |
827 | * in case of the device driver could provide this service, and then wait |
828 | * for pcifront ack. | |
829 | * @dev: pointer to PCI devices | |
830 | */ | |
831 | ||
a92336a1 | 832 | static void xen_pcibk_error_resume(struct pci_dev *dev) |
30edc14b KRW |
833 | { |
834 | struct pcistub_device *psdev; | |
835 | ||
a92336a1 | 836 | dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n", |
30edc14b KRW |
837 | dev->bus->number, dev->devfn); |
838 | ||
839 | down_write(&pcistub_sem); | |
840 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), | |
841 | dev->bus->number, | |
842 | PCI_SLOT(dev->devfn), | |
843 | PCI_FUNC(dev->devfn)); | |
844 | ||
845 | if (!psdev || !psdev->pdev) { | |
846 | dev_err(&dev->dev, | |
a92336a1 | 847 | DRV_NAME " device is not found/assigned\n"); |
30edc14b KRW |
848 | goto end; |
849 | } | |
850 | ||
851 | if (!psdev->pdev->sh_info) { | |
a92336a1 | 852 | dev_err(&dev->dev, DRV_NAME " device is not connected or owned" |
30edc14b KRW |
853 | " by HVM, kill it\n"); |
854 | kill_domain_by_device(psdev); | |
e6aa70a0 | 855 | goto end; |
30edc14b KRW |
856 | } |
857 | ||
858 | if (!test_bit(_XEN_PCIB_AERHANDLER, | |
859 | (unsigned long *)&psdev->pdev->sh_info->flags)) { | |
860 | dev_err(&dev->dev, | |
861 | "guest with no AER driver should have been killed\n"); | |
862 | kill_domain_by_device(psdev); | |
e6aa70a0 | 863 | goto end; |
30edc14b KRW |
864 | } |
865 | common_process(psdev, 1, XEN_PCI_OP_aer_resume, | |
866 | PCI_ERS_RESULT_RECOVERED); | |
30edc14b | 867 | end: |
e6aa70a0 JB |
868 | if (psdev) |
869 | pcistub_device_put(psdev); | |
30edc14b KRW |
870 | up_write(&pcistub_sem); |
871 | return; | |
872 | } | |
873 | ||
a92336a1 | 874 | /*add xen_pcibk AER handling*/ |
1d352035 | 875 | static const struct pci_error_handlers xen_pcibk_error_handler = { |
a92336a1 KRW |
876 | .error_detected = xen_pcibk_error_detected, |
877 | .mmio_enabled = xen_pcibk_mmio_enabled, | |
878 | .slot_reset = xen_pcibk_slot_reset, | |
879 | .resume = xen_pcibk_error_resume, | |
30edc14b KRW |
880 | }; |
881 | ||
882 | /* | |
883 | * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't | |
884 | * for a normal device. I don't want it to be loaded automatically. | |
885 | */ | |
886 | ||
a92336a1 KRW |
887 | static struct pci_driver xen_pcibk_pci_driver = { |
888 | /* The name should be xen_pciback, but until the tools are updated | |
889 | * we will keep it as pciback. */ | |
890 | .name = "pciback", | |
30edc14b KRW |
891 | .id_table = pcistub_ids, |
892 | .probe = pcistub_probe, | |
893 | .remove = pcistub_remove, | |
a92336a1 | 894 | .err_handler = &xen_pcibk_error_handler, |
30edc14b KRW |
895 | }; |
896 | ||
897 | static inline int str_to_slot(const char *buf, int *domain, int *bus, | |
898 | int *slot, int *func) | |
899 | { | |
900 | int err; | |
c3cb4709 | 901 | char wc = '*'; |
30edc14b KRW |
902 | |
903 | err = sscanf(buf, " %x:%x:%x.%x", domain, bus, slot, func); | |
c3cb4709 JB |
904 | switch (err) { |
905 | case 3: | |
906 | *func = -1; | |
907 | err = sscanf(buf, " %x:%x:%x.%c", domain, bus, slot, &wc); | |
908 | break; | |
909 | case 2: | |
910 | *slot = *func = -1; | |
911 | err = sscanf(buf, " %x:%x:*.%c", domain, bus, &wc); | |
912 | if (err >= 2) | |
913 | ++err; | |
914 | break; | |
915 | } | |
916 | if (err == 4 && wc == '*') | |
30edc14b KRW |
917 | return 0; |
918 | else if (err < 0) | |
919 | return -EINVAL; | |
920 | ||
921 | /* try again without domain */ | |
922 | *domain = 0; | |
c3cb4709 | 923 | wc = '*'; |
30edc14b | 924 | err = sscanf(buf, " %x:%x.%x", bus, slot, func); |
c3cb4709 JB |
925 | switch (err) { |
926 | case 2: | |
927 | *func = -1; | |
928 | err = sscanf(buf, " %x:%x.%c", bus, slot, &wc); | |
929 | break; | |
930 | case 1: | |
931 | *slot = *func = -1; | |
932 | err = sscanf(buf, " %x:*.%c", bus, &wc) + 1; | |
933 | break; | |
934 | } | |
935 | if (err == 3 && wc == '*') | |
30edc14b KRW |
936 | return 0; |
937 | ||
938 | return -EINVAL; | |
939 | } | |
940 | ||
941 | static inline int str_to_quirk(const char *buf, int *domain, int *bus, int | |
942 | *slot, int *func, int *reg, int *size, int *mask) | |
943 | { | |
944 | int err; | |
945 | ||
946 | err = | |
e4de866a | 947 | sscanf(buf, " %04x:%02x:%02x.%d-%08x:%1x:%08x", domain, bus, slot, |
30edc14b KRW |
948 | func, reg, size, mask); |
949 | if (err == 7) | |
950 | return 0; | |
951 | return -EINVAL; | |
952 | } | |
953 | ||
954 | static int pcistub_device_id_add(int domain, int bus, int slot, int func) | |
955 | { | |
956 | struct pcistub_device_id *pci_dev_id; | |
957 | unsigned long flags; | |
c3cb4709 JB |
958 | int rc = 0; |
959 | ||
960 | if (slot < 0) { | |
961 | for (slot = 0; !rc && slot < 32; ++slot) | |
962 | rc = pcistub_device_id_add(domain, bus, slot, func); | |
963 | return rc; | |
964 | } | |
965 | ||
966 | if (func < 0) { | |
967 | for (func = 0; !rc && func < 8; ++func) | |
968 | rc = pcistub_device_id_add(domain, bus, slot, func); | |
969 | return rc; | |
970 | } | |
30edc14b KRW |
971 | |
972 | pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); | |
973 | if (!pci_dev_id) | |
974 | return -ENOMEM; | |
975 | ||
976 | pci_dev_id->domain = domain; | |
977 | pci_dev_id->bus = bus; | |
978 | pci_dev_id->devfn = PCI_DEVFN(slot, func); | |
979 | ||
e4de866a | 980 | pr_debug(DRV_NAME ": wants to seize %04x:%02x:%02x.%d\n", |
30edc14b KRW |
981 | domain, bus, slot, func); |
982 | ||
983 | spin_lock_irqsave(&device_ids_lock, flags); | |
984 | list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids); | |
985 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
990 | static int pcistub_device_id_remove(int domain, int bus, int slot, int func) | |
991 | { | |
992 | struct pcistub_device_id *pci_dev_id, *t; | |
30edc14b KRW |
993 | int err = -ENOENT; |
994 | unsigned long flags; | |
995 | ||
996 | spin_lock_irqsave(&device_ids_lock, flags); | |
997 | list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids, | |
998 | slot_list) { | |
c3cb4709 JB |
999 | if (pci_dev_id->domain == domain && pci_dev_id->bus == bus |
1000 | && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot) | |
1001 | && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) { | |
30edc14b KRW |
1002 | /* Don't break; here because it's possible the same |
1003 | * slot could be in the list more than once | |
1004 | */ | |
1005 | list_del(&pci_dev_id->slot_list); | |
1006 | kfree(pci_dev_id); | |
1007 | ||
1008 | err = 0; | |
1009 | ||
e4de866a | 1010 | pr_debug(DRV_NAME ": removed %04x:%02x:%02x.%d from " |
30edc14b KRW |
1011 | "seize list\n", domain, bus, slot, func); |
1012 | } | |
1013 | } | |
1014 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1015 | ||
1016 | return err; | |
1017 | } | |
1018 | ||
1019 | static int pcistub_reg_add(int domain, int bus, int slot, int func, int reg, | |
1020 | int size, int mask) | |
1021 | { | |
1022 | int err = 0; | |
1023 | struct pcistub_device *psdev; | |
1024 | struct pci_dev *dev; | |
1025 | struct config_field *field; | |
1026 | ||
1027 | psdev = pcistub_device_find(domain, bus, slot, func); | |
e6aa70a0 | 1028 | if (!psdev) { |
30edc14b KRW |
1029 | err = -ENODEV; |
1030 | goto out; | |
1031 | } | |
1032 | dev = psdev->dev; | |
1033 | ||
1034 | field = kzalloc(sizeof(*field), GFP_ATOMIC); | |
1035 | if (!field) { | |
1036 | err = -ENOMEM; | |
1037 | goto out; | |
1038 | } | |
1039 | ||
1040 | field->offset = reg; | |
1041 | field->size = size; | |
1042 | field->mask = mask; | |
1043 | field->init = NULL; | |
1044 | field->reset = NULL; | |
1045 | field->release = NULL; | |
a92336a1 | 1046 | field->clean = xen_pcibk_config_field_free; |
30edc14b | 1047 | |
a92336a1 | 1048 | err = xen_pcibk_config_quirks_add_field(dev, field); |
30edc14b KRW |
1049 | if (err) |
1050 | kfree(field); | |
1051 | out: | |
e6aa70a0 JB |
1052 | if (psdev) |
1053 | pcistub_device_put(psdev); | |
30edc14b KRW |
1054 | return err; |
1055 | } | |
1056 | ||
1057 | static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf, | |
1058 | size_t count) | |
1059 | { | |
1060 | int domain, bus, slot, func; | |
1061 | int err; | |
1062 | ||
1063 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1064 | if (err) | |
1065 | goto out; | |
1066 | ||
1067 | err = pcistub_device_id_add(domain, bus, slot, func); | |
1068 | ||
1069 | out: | |
1070 | if (!err) | |
1071 | err = count; | |
1072 | return err; | |
1073 | } | |
402c5e15 | 1074 | static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add); |
30edc14b KRW |
1075 | |
1076 | static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf, | |
1077 | size_t count) | |
1078 | { | |
1079 | int domain, bus, slot, func; | |
1080 | int err; | |
1081 | ||
1082 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1083 | if (err) | |
1084 | goto out; | |
1085 | ||
1086 | err = pcistub_device_id_remove(domain, bus, slot, func); | |
1087 | ||
1088 | out: | |
1089 | if (!err) | |
1090 | err = count; | |
1091 | return err; | |
1092 | } | |
402c5e15 | 1093 | static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove); |
30edc14b KRW |
1094 | |
1095 | static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf) | |
1096 | { | |
1097 | struct pcistub_device_id *pci_dev_id; | |
1098 | size_t count = 0; | |
1099 | unsigned long flags; | |
1100 | ||
1101 | spin_lock_irqsave(&device_ids_lock, flags); | |
1102 | list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { | |
1103 | if (count >= PAGE_SIZE) | |
1104 | break; | |
1105 | ||
1106 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
e4de866a | 1107 | "%04x:%02x:%02x.%d\n", |
30edc14b KRW |
1108 | pci_dev_id->domain, pci_dev_id->bus, |
1109 | PCI_SLOT(pci_dev_id->devfn), | |
1110 | PCI_FUNC(pci_dev_id->devfn)); | |
1111 | } | |
1112 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1113 | ||
1114 | return count; | |
1115 | } | |
402c5e15 | 1116 | static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL); |
30edc14b | 1117 | |
0513fe9e KRW |
1118 | static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf) |
1119 | { | |
1120 | struct pcistub_device *psdev; | |
a92336a1 | 1121 | struct xen_pcibk_dev_data *dev_data; |
0513fe9e KRW |
1122 | size_t count = 0; |
1123 | unsigned long flags; | |
1124 | ||
1125 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1126 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1127 | if (count >= PAGE_SIZE) | |
1128 | break; | |
1129 | if (!psdev->dev) | |
1130 | continue; | |
1131 | dev_data = pci_get_drvdata(psdev->dev); | |
1132 | if (!dev_data) | |
1133 | continue; | |
1134 | count += | |
1135 | scnprintf(buf + count, PAGE_SIZE - count, | |
1136 | "%s:%s:%sing:%ld\n", | |
1137 | pci_name(psdev->dev), | |
1138 | dev_data->isr_on ? "on" : "off", | |
1139 | dev_data->ack_intr ? "ack" : "not ack", | |
1140 | dev_data->handled); | |
1141 | } | |
1142 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1143 | return count; | |
1144 | } | |
402c5e15 | 1145 | static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL); |
0513fe9e KRW |
1146 | |
1147 | static ssize_t pcistub_irq_handler_switch(struct device_driver *drv, | |
1148 | const char *buf, | |
1149 | size_t count) | |
1150 | { | |
1151 | struct pcistub_device *psdev; | |
a92336a1 | 1152 | struct xen_pcibk_dev_data *dev_data; |
0513fe9e KRW |
1153 | int domain, bus, slot, func; |
1154 | int err = -ENOENT; | |
1155 | ||
1156 | err = str_to_slot(buf, &domain, &bus, &slot, &func); | |
1157 | if (err) | |
e6aa70a0 | 1158 | return err; |
0513fe9e KRW |
1159 | |
1160 | psdev = pcistub_device_find(domain, bus, slot, func); | |
0513fe9e KRW |
1161 | if (!psdev) |
1162 | goto out; | |
1163 | ||
1164 | dev_data = pci_get_drvdata(psdev->dev); | |
1165 | if (!dev_data) | |
1166 | goto out; | |
1167 | ||
1168 | dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n", | |
1169 | dev_data->irq_name, dev_data->isr_on, | |
1170 | !dev_data->isr_on); | |
1171 | ||
1172 | dev_data->isr_on = !(dev_data->isr_on); | |
1173 | if (dev_data->isr_on) | |
1174 | dev_data->ack_intr = 1; | |
1175 | out: | |
e6aa70a0 JB |
1176 | if (psdev) |
1177 | pcistub_device_put(psdev); | |
0513fe9e KRW |
1178 | if (!err) |
1179 | err = count; | |
1180 | return err; | |
1181 | } | |
402c5e15 JB |
1182 | static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL, |
1183 | pcistub_irq_handler_switch); | |
0513fe9e | 1184 | |
30edc14b KRW |
1185 | static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf, |
1186 | size_t count) | |
1187 | { | |
1188 | int domain, bus, slot, func, reg, size, mask; | |
1189 | int err; | |
1190 | ||
1191 | err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size, | |
1192 | &mask); | |
1193 | if (err) | |
1194 | goto out; | |
1195 | ||
1196 | err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask); | |
1197 | ||
1198 | out: | |
1199 | if (!err) | |
1200 | err = count; | |
1201 | return err; | |
1202 | } | |
1203 | ||
1204 | static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf) | |
1205 | { | |
1206 | int count = 0; | |
1207 | unsigned long flags; | |
a92336a1 KRW |
1208 | struct xen_pcibk_config_quirk *quirk; |
1209 | struct xen_pcibk_dev_data *dev_data; | |
30edc14b KRW |
1210 | const struct config_field *field; |
1211 | const struct config_field_entry *cfg_entry; | |
1212 | ||
1213 | spin_lock_irqsave(&device_ids_lock, flags); | |
a92336a1 | 1214 | list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) { |
30edc14b KRW |
1215 | if (count >= PAGE_SIZE) |
1216 | goto out; | |
1217 | ||
1218 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1219 | "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n", | |
1220 | quirk->pdev->bus->number, | |
1221 | PCI_SLOT(quirk->pdev->devfn), | |
1222 | PCI_FUNC(quirk->pdev->devfn), | |
1223 | quirk->devid.vendor, quirk->devid.device, | |
1224 | quirk->devid.subvendor, | |
1225 | quirk->devid.subdevice); | |
1226 | ||
1227 | dev_data = pci_get_drvdata(quirk->pdev); | |
1228 | ||
1229 | list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { | |
1230 | field = cfg_entry->field; | |
1231 | if (count >= PAGE_SIZE) | |
1232 | goto out; | |
1233 | ||
1234 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1235 | "\t\t%08x:%01x:%08x\n", | |
1236 | cfg_entry->base_offset + | |
1237 | field->offset, field->size, | |
1238 | field->mask); | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | out: | |
1243 | spin_unlock_irqrestore(&device_ids_lock, flags); | |
1244 | ||
1245 | return count; | |
1246 | } | |
402c5e15 JB |
1247 | static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show, |
1248 | pcistub_quirk_add); | |
30edc14b KRW |
1249 | |
1250 | static ssize_t permissive_add(struct device_driver *drv, const char *buf, | |
1251 | size_t count) | |
1252 | { | |
1253 | int domain, bus, slot, func; | |
1254 | int err; | |
1255 | struct pcistub_device *psdev; | |
a92336a1 | 1256 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
1257 | err = str_to_slot(buf, &domain, &bus, &slot, &func); |
1258 | if (err) | |
1259 | goto out; | |
c3cb4709 JB |
1260 | if (slot < 0 || func < 0) { |
1261 | err = -EINVAL; | |
1262 | goto out; | |
1263 | } | |
30edc14b KRW |
1264 | psdev = pcistub_device_find(domain, bus, slot, func); |
1265 | if (!psdev) { | |
1266 | err = -ENODEV; | |
1267 | goto out; | |
1268 | } | |
e6aa70a0 | 1269 | |
30edc14b KRW |
1270 | dev_data = pci_get_drvdata(psdev->dev); |
1271 | /* the driver data for a device should never be null at this point */ | |
1272 | if (!dev_data) { | |
1273 | err = -ENXIO; | |
1274 | goto release; | |
1275 | } | |
1276 | if (!dev_data->permissive) { | |
1277 | dev_data->permissive = 1; | |
1278 | /* Let user know that what they're doing could be unsafe */ | |
1279 | dev_warn(&psdev->dev->dev, "enabling permissive mode " | |
1280 | "configuration space accesses!\n"); | |
1281 | dev_warn(&psdev->dev->dev, | |
1282 | "permissive mode is potentially unsafe!\n"); | |
1283 | } | |
1284 | release: | |
1285 | pcistub_device_put(psdev); | |
1286 | out: | |
1287 | if (!err) | |
1288 | err = count; | |
1289 | return err; | |
1290 | } | |
1291 | ||
1292 | static ssize_t permissive_show(struct device_driver *drv, char *buf) | |
1293 | { | |
1294 | struct pcistub_device *psdev; | |
a92336a1 | 1295 | struct xen_pcibk_dev_data *dev_data; |
30edc14b KRW |
1296 | size_t count = 0; |
1297 | unsigned long flags; | |
1298 | spin_lock_irqsave(&pcistub_devices_lock, flags); | |
1299 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { | |
1300 | if (count >= PAGE_SIZE) | |
1301 | break; | |
1302 | if (!psdev->dev) | |
1303 | continue; | |
1304 | dev_data = pci_get_drvdata(psdev->dev); | |
1305 | if (!dev_data || !dev_data->permissive) | |
1306 | continue; | |
1307 | count += | |
1308 | scnprintf(buf + count, PAGE_SIZE - count, "%s\n", | |
1309 | pci_name(psdev->dev)); | |
1310 | } | |
1311 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); | |
1312 | return count; | |
1313 | } | |
402c5e15 JB |
1314 | static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, |
1315 | permissive_add); | |
30edc14b KRW |
1316 | |
1317 | static void pcistub_exit(void) | |
1318 | { | |
a92336a1 KRW |
1319 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot); |
1320 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
30edc14b | 1321 | &driver_attr_remove_slot); |
a92336a1 KRW |
1322 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots); |
1323 | driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks); | |
1324 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
1325 | &driver_attr_permissive); | |
1326 | driver_remove_file(&xen_pcibk_pci_driver.driver, | |
0513fe9e | 1327 | &driver_attr_irq_handlers); |
a92336a1 | 1328 | driver_remove_file(&xen_pcibk_pci_driver.driver, |
0513fe9e | 1329 | &driver_attr_irq_handler_state); |
a92336a1 | 1330 | pci_unregister_driver(&xen_pcibk_pci_driver); |
30edc14b KRW |
1331 | } |
1332 | ||
1333 | static int __init pcistub_init(void) | |
1334 | { | |
1335 | int pos = 0; | |
1336 | int err = 0; | |
1337 | int domain, bus, slot, func; | |
1338 | int parsed; | |
1339 | ||
1340 | if (pci_devs_to_hide && *pci_devs_to_hide) { | |
1341 | do { | |
c3cb4709 JB |
1342 | char wc = '*'; |
1343 | ||
30edc14b KRW |
1344 | parsed = 0; |
1345 | ||
1346 | err = sscanf(pci_devs_to_hide + pos, | |
1347 | " (%x:%x:%x.%x) %n", | |
1348 | &domain, &bus, &slot, &func, &parsed); | |
c3cb4709 JB |
1349 | switch (err) { |
1350 | case 3: | |
1351 | func = -1; | |
1352 | err = sscanf(pci_devs_to_hide + pos, | |
1353 | " (%x:%x:%x.%c) %n", | |
1354 | &domain, &bus, &slot, &wc, | |
1355 | &parsed); | |
1356 | break; | |
1357 | case 2: | |
1358 | slot = func = -1; | |
1359 | err = sscanf(pci_devs_to_hide + pos, | |
1360 | " (%x:%x:*.%c) %n", | |
1361 | &domain, &bus, &wc, &parsed) + 1; | |
1362 | break; | |
1363 | } | |
1364 | ||
1365 | if (err != 4 || wc != '*') { | |
30edc14b | 1366 | domain = 0; |
c3cb4709 | 1367 | wc = '*'; |
30edc14b KRW |
1368 | err = sscanf(pci_devs_to_hide + pos, |
1369 | " (%x:%x.%x) %n", | |
1370 | &bus, &slot, &func, &parsed); | |
c3cb4709 JB |
1371 | switch (err) { |
1372 | case 2: | |
1373 | func = -1; | |
1374 | err = sscanf(pci_devs_to_hide + pos, | |
1375 | " (%x:%x.%c) %n", | |
1376 | &bus, &slot, &wc, | |
1377 | &parsed); | |
1378 | break; | |
1379 | case 1: | |
1380 | slot = func = -1; | |
1381 | err = sscanf(pci_devs_to_hide + pos, | |
1382 | " (%x:*.%c) %n", | |
1383 | &bus, &wc, &parsed) + 1; | |
1384 | break; | |
1385 | } | |
1386 | if (err != 3 || wc != '*') | |
30edc14b KRW |
1387 | goto parse_error; |
1388 | } | |
1389 | ||
1390 | err = pcistub_device_id_add(domain, bus, slot, func); | |
1391 | if (err) | |
1392 | goto out; | |
1393 | ||
1394 | /* if parsed<=0, we've reached the end of the string */ | |
1395 | pos += parsed; | |
1396 | } while (parsed > 0 && pci_devs_to_hide[pos]); | |
1397 | } | |
1398 | ||
1399 | /* If we're the first PCI Device Driver to register, we're the | |
1400 | * first one to get offered PCI devices as they become | |
1401 | * available (and thus we can be the first to grab them) | |
1402 | */ | |
a92336a1 | 1403 | err = pci_register_driver(&xen_pcibk_pci_driver); |
30edc14b KRW |
1404 | if (err < 0) |
1405 | goto out; | |
1406 | ||
a92336a1 | 1407 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1408 | &driver_attr_new_slot); |
1409 | if (!err) | |
a92336a1 | 1410 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1411 | &driver_attr_remove_slot); |
1412 | if (!err) | |
a92336a1 | 1413 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1414 | &driver_attr_slots); |
1415 | if (!err) | |
a92336a1 | 1416 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1417 | &driver_attr_quirks); |
1418 | if (!err) | |
a92336a1 | 1419 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
30edc14b KRW |
1420 | &driver_attr_permissive); |
1421 | ||
0513fe9e | 1422 | if (!err) |
a92336a1 | 1423 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
0513fe9e KRW |
1424 | &driver_attr_irq_handlers); |
1425 | if (!err) | |
a92336a1 | 1426 | err = driver_create_file(&xen_pcibk_pci_driver.driver, |
0513fe9e | 1427 | &driver_attr_irq_handler_state); |
30edc14b KRW |
1428 | if (err) |
1429 | pcistub_exit(); | |
1430 | ||
1431 | out: | |
1432 | return err; | |
1433 | ||
1434 | parse_error: | |
a92336a1 | 1435 | printk(KERN_ERR DRV_NAME ": Error parsing pci_devs_to_hide at \"%s\"\n", |
30edc14b KRW |
1436 | pci_devs_to_hide + pos); |
1437 | return -EINVAL; | |
1438 | } | |
1439 | ||
1440 | #ifndef MODULE | |
1441 | /* | |
1442 | * fs_initcall happens before device_initcall | |
a92336a1 | 1443 | * so xen_pcibk *should* get called first (b/c we |
30edc14b KRW |
1444 | * want to suck up any device before other drivers |
1445 | * get a chance by being the first pci device | |
1446 | * driver to register) | |
1447 | */ | |
1448 | fs_initcall(pcistub_init); | |
1449 | #endif | |
1450 | ||
a92336a1 | 1451 | static int __init xen_pcibk_init(void) |
30edc14b KRW |
1452 | { |
1453 | int err; | |
1454 | ||
1455 | if (!xen_initial_domain()) | |
1456 | return -ENODEV; | |
1457 | ||
a92336a1 | 1458 | err = xen_pcibk_config_init(); |
30edc14b KRW |
1459 | if (err) |
1460 | return err; | |
1461 | ||
1462 | #ifdef MODULE | |
1463 | err = pcistub_init(); | |
1464 | if (err < 0) | |
1465 | return err; | |
1466 | #endif | |
1467 | ||
1468 | pcistub_init_devices_late(); | |
a92336a1 | 1469 | err = xen_pcibk_xenbus_register(); |
30edc14b KRW |
1470 | if (err) |
1471 | pcistub_exit(); | |
1472 | ||
1473 | return err; | |
1474 | } | |
1475 | ||
a92336a1 | 1476 | static void __exit xen_pcibk_cleanup(void) |
30edc14b | 1477 | { |
a92336a1 | 1478 | xen_pcibk_xenbus_unregister(); |
30edc14b KRW |
1479 | pcistub_exit(); |
1480 | } | |
1481 | ||
a92336a1 KRW |
1482 | module_init(xen_pcibk_init); |
1483 | module_exit(xen_pcibk_cleanup); | |
30edc14b KRW |
1484 | |
1485 | MODULE_LICENSE("Dual BSD/GPL"); | |
402c5e15 | 1486 | MODULE_ALIAS("xen-backend:pci"); |