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