?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / xen / xen-pciback / pci_stub.c
blobcb904ac830064672d8125a0bb6f86a79a0bed346
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
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 #define dev_fmt pr_fmt
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/rwsem.h>
14 #include <linux/list.h>
15 #include <linux/spinlock.h>
16 #include <linux/kref.h>
17 #include <linux/pci.h>
18 #include <linux/wait.h>
19 #include <linux/sched.h>
20 #include <linux/atomic.h>
21 #include <xen/events.h>
22 #include <asm/xen/pci.h>
23 #include <asm/xen/hypervisor.h>
24 #include <xen/interface/physdev.h>
25 #include "pciback.h"
26 #include "conf_space.h"
27 #include "conf_space_quirks.h"
28
29 #define PCISTUB_DRIVER_NAME "pciback"
30
31 static char *pci_devs_to_hide;
32 wait_queue_head_t xen_pcibk_aer_wait_queue;
33 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
34 * We want to avoid in middle of AER ops, xen_pcibk devices is being removed
35 */
36 static DECLARE_RWSEM(pcistub_sem);
37 module_param_named(hide, pci_devs_to_hide, charp, 0444);
38
39 struct pcistub_device_id {
40 struct list_head slot_list;
41 int domain;
42 unsigned char bus;
43 unsigned int devfn;
44 };
45 static LIST_HEAD(pcistub_device_ids);
46 static DEFINE_SPINLOCK(device_ids_lock);
47
48 struct pcistub_device {
49 struct kref kref;
50 struct list_head dev_list;
51 spinlock_t lock;
52
53 struct pci_dev *dev;
54 struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */
55 };
56
57 /* Access to pcistub_devices & seized_devices lists and the initialize_devices
58 * flag must be locked with pcistub_devices_lock
59 */
60 static DEFINE_SPINLOCK(pcistub_devices_lock);
61 static LIST_HEAD(pcistub_devices);
62
63 /* wait for device_initcall before initializing our devices
64 * (see pcistub_init_devices_late)
65 */
66 static int initialize_devices;
67 static LIST_HEAD(seized_devices);
68
69 static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
70 {
71 struct pcistub_device *psdev;
72
73 dev_dbg(&dev->dev, "pcistub_device_alloc\n");
74
75 psdev = kzalloc(sizeof(*psdev), GFP_KERNEL);
76 if (!psdev)
77 return NULL;
78
79 psdev->dev = pci_dev_get(dev);
80 if (!psdev->dev) {
81 kfree(psdev);
82 return NULL;
83 }
84
85 kref_init(&psdev->kref);
86 spin_lock_init(&psdev->lock);
87
88 return psdev;
89 }
90
91 /* Don't call this directly as it's called by pcistub_device_put */
92 static void pcistub_device_release(struct kref *kref)
93 {
94 struct pcistub_device *psdev;
95 struct pci_dev *dev;
96 struct xen_pcibk_dev_data *dev_data;
97
98 psdev = container_of(kref, struct pcistub_device, kref);
99 dev = psdev->dev;
100 dev_data = pci_get_drvdata(dev);
101
102 dev_dbg(&dev->dev, "pcistub_device_release\n");
103
104 xen_unregister_device_domain_owner(dev);
105
106 /* Call the reset function which does not take lock as this
107 * is called from "unbind" which takes a device_lock mutex.
108 */
109 __pci_reset_function_locked(dev);
110 if (dev_data &&
111 pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state))
112 dev_info(&dev->dev, "Could not reload PCI state\n");
113 else
114 pci_restore_state(dev);
115
116 if (dev->msix_cap) {
117 struct physdev_pci_device ppdev = {
118 .seg = pci_domain_nr(dev->bus),
119 .bus = dev->bus->number,
120 .devfn = dev->devfn
121 };
122 int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix,
123 &ppdev);
124
125 if (err && err != -ENOSYS)
126 dev_warn(&dev->dev, "MSI-X release failed (%d)\n",
127 err);
128 }
129
130 /* Disable the device */
131 xen_pcibk_reset_device(dev);
132
133 kfree(dev_data);
134 pci_set_drvdata(dev, NULL);
135
136 /* Clean-up the device */
137 xen_pcibk_config_free_dyn_fields(dev);
138 xen_pcibk_config_free_dev(dev);
139
140 pci_clear_dev_assigned(dev);
141 pci_dev_put(dev);
142
143 kfree(psdev);
144 }
145
146 static inline void pcistub_device_get(struct pcistub_device *psdev)
147 {
148 kref_get(&psdev->kref);
149 }
150
151 static inline void pcistub_device_put(struct pcistub_device *psdev)
152 {
153 kref_put(&psdev->kref, pcistub_device_release);
154 }
155
156 static struct pcistub_device *pcistub_device_find_locked(int domain, int bus,
157 int slot, int func)
158 {
159 struct pcistub_device *psdev;
160
161 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
162 if (psdev->dev != NULL
163 && domain == pci_domain_nr(psdev->dev->bus)
164 && bus == psdev->dev->bus->number
165 && slot == PCI_SLOT(psdev->dev->devfn)
166 && func == PCI_FUNC(psdev->dev->devfn)) {
167 return psdev;
168 }
169 }
170
171 return NULL;
172 }
173
174 static struct pcistub_device *pcistub_device_find(int domain, int bus,
175 int slot, int func)
176 {
177 struct pcistub_device *psdev;
178 unsigned long flags;
179
180 spin_lock_irqsave(&pcistub_devices_lock, flags);
181
182 psdev = pcistub_device_find_locked(domain, bus, slot, func);
183 if (psdev)
184 pcistub_device_get(psdev);
185
186 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
187 return psdev;
188 }
189
190 static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
191 struct pcistub_device *psdev)
192 {
193 struct pci_dev *pci_dev = NULL;
194 unsigned long flags;
195
196 pcistub_device_get(psdev);
197
198 spin_lock_irqsave(&psdev->lock, flags);
199 if (!psdev->pdev) {
200 psdev->pdev = pdev;
201 pci_dev = psdev->dev;
202 }
203 spin_unlock_irqrestore(&psdev->lock, flags);
204
205 if (!pci_dev)
206 pcistub_device_put(psdev);
207
208 return pci_dev;
209 }
210
211 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
212 int domain, int bus,
213 int slot, int func)
214 {
215 struct pcistub_device *psdev;
216 struct pci_dev *found_dev = NULL;
217 unsigned long flags;
218
219 spin_lock_irqsave(&pcistub_devices_lock, flags);
220
221 psdev = pcistub_device_find_locked(domain, bus, slot, func);
222 if (psdev)
223 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
224
225 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
226 return found_dev;
227 }
228
229 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
230 struct pci_dev *dev)
231 {
232 struct pcistub_device *psdev;
233 struct pci_dev *found_dev = NULL;
234 unsigned long flags;
235
236 spin_lock_irqsave(&pcistub_devices_lock, flags);
237
238 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
239 if (psdev->dev == dev) {
240 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
241 break;
242 }
243 }
244
245 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
246 return found_dev;
247 }
248
249 /*
250 * Called when:
251 * - XenBus state has been reconfigure (pci unplug). See xen_pcibk_remove_device
252 * - XenBus state has been disconnected (guest shutdown). See xen_pcibk_xenbus_remove
253 * - 'echo BDF > unbind' on pciback module with no guest attached. See pcistub_remove
254 * - 'echo BDF > unbind' with a guest still using it. See pcistub_remove
255 *
256 * As such we have to be careful.
257 *
258 * To make this easier, the caller has to hold the device lock.
259 */
260 void pcistub_put_pci_dev(struct pci_dev *dev)
261 {
262 struct pcistub_device *psdev, *found_psdev = NULL;
263 unsigned long flags;
264 struct xen_pcibk_dev_data *dev_data;
265 int ret;
266
267 spin_lock_irqsave(&pcistub_devices_lock, flags);
268
269 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
270 if (psdev->dev == dev) {
271 found_psdev = psdev;
272 break;
273 }
274 }
275
276 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
277 if (WARN_ON(!found_psdev))
278 return;
279
280 /*hold this lock for avoiding breaking link between
281 * pcistub and xen_pcibk when AER is in processing
282 */
283 down_write(&pcistub_sem);
284 /* Cleanup our device
285 * (so it's ready for the next domain)
286 */
287 device_lock_assert(&dev->dev);
288 __pci_reset_function_locked(dev);
289
290 dev_data = pci_get_drvdata(dev);
291 ret = pci_load_saved_state(dev, dev_data->pci_saved_state);
292 if (!ret) {
293 /*
294 * The usual sequence is pci_save_state & pci_restore_state
295 * but the guest might have messed the configuration space up.
296 * Use the initial version (when device was bound to us).
297 */
298 pci_restore_state(dev);
299 } else
300 dev_info(&dev->dev, "Could not reload PCI state\n");
301 /* This disables the device. */
302 xen_pcibk_reset_device(dev);
303
304 /* And cleanup up our emulated fields. */
305 xen_pcibk_config_reset_dev(dev);
306 xen_pcibk_config_free_dyn_fields(dev);
307
308 dev_data->allow_interrupt_control = 0;
309
310 xen_unregister_device_domain_owner(dev);
311
312 spin_lock_irqsave(&found_psdev->lock, flags);
313 found_psdev->pdev = NULL;
314 spin_unlock_irqrestore(&found_psdev->lock, flags);
315
316 pcistub_device_put(found_psdev);
317 up_write(&pcistub_sem);
318 }
319
320 static int pcistub_match_one(struct pci_dev *dev,
321 struct pcistub_device_id *pdev_id)
322 {
323 /* Match the specified device by domain, bus, slot, func and also if
324 * any of the device's parent bridges match.
325 */
326 for (; dev != NULL; dev = dev->bus->self) {
327 if (pci_domain_nr(dev->bus) == pdev_id->domain
328 && dev->bus->number == pdev_id->bus
329 && dev->devfn == pdev_id->devfn)
330 return 1;
331
332 /* Sometimes topmost bridge links to itself. */
333 if (dev == dev->bus->self)
334 break;
335 }
336
337 return 0;
338 }
339
340 static int pcistub_match(struct pci_dev *dev)
341 {
342 struct pcistub_device_id *pdev_id;
343 unsigned long flags;
344 int found = 0;
345
346 spin_lock_irqsave(&device_ids_lock, flags);
347 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
348 if (pcistub_match_one(dev, pdev_id)) {
349 found = 1;
350 break;
351 }
352 }
353 spin_unlock_irqrestore(&device_ids_lock, flags);
354
355 return found;
356 }
357
358 static int pcistub_init_device(struct pci_dev *dev)
359 {
360 struct xen_pcibk_dev_data *dev_data;
361 int err = 0;
362
363 dev_dbg(&dev->dev, "initializing...\n");
364
365 /* The PCI backend is not intended to be a module (or to work with
366 * removable PCI devices (yet). If it were, xen_pcibk_config_free()
367 * would need to be called somewhere to free the memory allocated
368 * here and then to call kfree(pci_get_drvdata(psdev->dev)).
369 */
370 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
371 + strlen(pci_name(dev)) + 1, GFP_KERNEL);
372 if (!dev_data) {
373 err = -ENOMEM;
374 goto out;
375 }
376 pci_set_drvdata(dev, dev_data);
377
378 /*
379 * Setup name for fake IRQ handler. It will only be enabled
380 * once the device is turned on by the guest.
381 */
382 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
383
384 dev_dbg(&dev->dev, "initializing config\n");
385
386 init_waitqueue_head(&xen_pcibk_aer_wait_queue);
387 err = xen_pcibk_config_init_dev(dev);
388 if (err)
389 goto out;
390
391 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we
392 * must do this here because pcibios_enable_device may specify
393 * the pci device's true irq (and possibly its other resources)
394 * if they differ from what's in the configuration space.
395 * This makes the assumption that the device's resources won't
396 * change after this point (otherwise this code may break!)
397 */
398 dev_dbg(&dev->dev, "enabling device\n");
399 err = pci_enable_device(dev);
400 if (err)
401 goto config_release;
402
403 if (dev->msix_cap) {
404 struct physdev_pci_device ppdev = {
405 .seg = pci_domain_nr(dev->bus),
406 .bus = dev->bus->number,
407 .devfn = dev->devfn
408 };
409
410 err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev);
411 if (err && err != -ENOSYS)
412 dev_err(&dev->dev, "MSI-X preparation failed (%d)\n",
413 err);
414 }
415
416 /* We need the device active to save the state. */
417 dev_dbg(&dev->dev, "save state of device\n");
418 pci_save_state(dev);
419 dev_data->pci_saved_state = pci_store_saved_state(dev);
420 if (!dev_data->pci_saved_state)
421 dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
422 else {
423 dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n");
424 __pci_reset_function_locked(dev);
425 pci_restore_state(dev);
426 }
427 /* Now disable the device (this also ensures some private device
428 * data is setup before we export)
429 */
430 dev_dbg(&dev->dev, "reset device\n");
431 xen_pcibk_reset_device(dev);
432
433 pci_set_dev_assigned(dev);
434 return 0;
435
436 config_release:
437 xen_pcibk_config_free_dev(dev);
438
439 out:
440 pci_set_drvdata(dev, NULL);
441 kfree(dev_data);
442 return err;
443 }
444
445 /*
446 * Because some initialization still happens on
447 * devices during fs_initcall, we need to defer
448 * full initialization of our devices until
449 * device_initcall.
450 */
451 static int __init pcistub_init_devices_late(void)
452 {
453 struct pcistub_device *psdev;
454 unsigned long flags;
455 int err = 0;
456
457 spin_lock_irqsave(&pcistub_devices_lock, flags);
458
459 while (!list_empty(&seized_devices)) {
460 psdev = container_of(seized_devices.next,
461 struct pcistub_device, dev_list);
462 list_del(&psdev->dev_list);
463
464 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
465
466 err = pcistub_init_device(psdev->dev);
467 if (err) {
468 dev_err(&psdev->dev->dev,
469 "error %d initializing device\n", err);
470 kfree(psdev);
471 psdev = NULL;
472 }
473
474 spin_lock_irqsave(&pcistub_devices_lock, flags);
475
476 if (psdev)
477 list_add_tail(&psdev->dev_list, &pcistub_devices);
478 }
479
480 initialize_devices = 1;
481
482 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
483
484 return 0;
485 }
486
487 static void pcistub_device_id_add_list(struct pcistub_device_id *new,
488 int domain, int bus, unsigned int devfn)
489 {
490 struct pcistub_device_id *pci_dev_id;
491 unsigned long flags;
492 int found = 0;
493
494 spin_lock_irqsave(&device_ids_lock, flags);
495
496 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
497 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus &&
498 pci_dev_id->devfn == devfn) {
499 found = 1;
500 break;
501 }
502 }
503
504 if (!found) {
505 new->domain = domain;
506 new->bus = bus;
507 new->devfn = devfn;
508 list_add_tail(&new->slot_list, &pcistub_device_ids);
509 }
510
511 spin_unlock_irqrestore(&device_ids_lock, flags);
512
513 if (found)
514 kfree(new);
515 }
516
517 static int pcistub_seize(struct pci_dev *dev,
518 struct pcistub_device_id *pci_dev_id)
519 {
520 struct pcistub_device *psdev;
521 unsigned long flags;
522 int err = 0;
523
524 psdev = pcistub_device_alloc(dev);
525 if (!psdev) {
526 kfree(pci_dev_id);
527 return -ENOMEM;
528 }
529
530 spin_lock_irqsave(&pcistub_devices_lock, flags);
531
532 if (initialize_devices) {
533 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
534
535 /* don't want irqs disabled when calling pcistub_init_device */
536 err = pcistub_init_device(psdev->dev);
537
538 spin_lock_irqsave(&pcistub_devices_lock, flags);
539
540 if (!err)
541 list_add(&psdev->dev_list, &pcistub_devices);
542 } else {
543 dev_dbg(&dev->dev, "deferring initialization\n");
544 list_add(&psdev->dev_list, &seized_devices);
545 }
546
547 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
548
549 if (err) {
550 kfree(pci_dev_id);
551 pcistub_device_put(psdev);
552 } else if (pci_dev_id)
553 pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus),
554 dev->bus->number, dev->devfn);
555
556 return err;
557 }
558
559 /* Called when 'bind'. This means we must _NOT_ call pci_reset_function or
560 * other functions that take the sysfs lock. */
561 static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
562 {
563 int err = 0, match;
564 struct pcistub_device_id *pci_dev_id = NULL;
565
566 dev_dbg(&dev->dev, "probing...\n");
567
568 match = pcistub_match(dev);
569
570 if ((dev->driver_override &&
571 !strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) ||
572 match) {
573
574 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
575 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
576 dev_err(&dev->dev, "can't export pci devices that "
577 "don't have a normal (0) or bridge (1) "
578 "header type!\n");
579 err = -ENODEV;
580 goto out;
581 }
582
583 if (!match) {
584 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
585 if (!pci_dev_id) {
586 err = -ENOMEM;
587 goto out;
588 }
589 }
590
591 dev_info(&dev->dev, "seizing device\n");
592 err = pcistub_seize(dev, pci_dev_id);
593 } else
594 /* Didn't find the device */
595 err = -ENODEV;
596
597 out:
598 return err;
599 }
600
601 /* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or
602 * other functions that take the sysfs lock. */
603 static void pcistub_remove(struct pci_dev *dev)
604 {
605 struct pcistub_device *psdev, *found_psdev = NULL;
606 unsigned long flags;
607
608 dev_dbg(&dev->dev, "removing\n");
609
610 spin_lock_irqsave(&pcistub_devices_lock, flags);
611
612 xen_pcibk_config_quirk_release(dev);
613
614 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
615 if (psdev->dev == dev) {
616 found_psdev = psdev;
617 break;
618 }
619 }
620
621 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
622
623 if (found_psdev) {
624 dev_dbg(&dev->dev, "found device to remove %s\n",
625 found_psdev->pdev ? "- in-use" : "");
626
627 if (found_psdev->pdev) {
628 int domid = xen_find_device_domain_owner(dev);
629
630 dev_warn(&dev->dev, "****** removing device %s while still in-use by domain %d! ******\n",
631 pci_name(found_psdev->dev), domid);
632 dev_warn(&dev->dev, "****** driver domain may still access this device's i/o resources!\n");
633 dev_warn(&dev->dev, "****** shutdown driver domain before binding device\n");
634 dev_warn(&dev->dev, "****** to other drivers or domains\n");
635
636 /* N.B. This ends up calling pcistub_put_pci_dev which ends up
637 * doing the FLR. */
638 xen_pcibk_release_pci_dev(found_psdev->pdev,
639 found_psdev->dev,
640 false /* caller holds the lock. */);
641 }
642
643 spin_lock_irqsave(&pcistub_devices_lock, flags);
644 list_del(&found_psdev->dev_list);
645 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
646
647 /* the final put for releasing from the list */
648 pcistub_device_put(found_psdev);
649 }
650 }
651
652 static const struct pci_device_id pcistub_ids[] = {
653 {
654 .vendor = PCI_ANY_ID,
655 .device = PCI_ANY_ID,
656 .subvendor = PCI_ANY_ID,
657 .subdevice = PCI_ANY_ID,
658 },
659 {0,},
660 };
661
662 #define PCI_NODENAME_MAX 40
663 static void kill_domain_by_device(struct pcistub_device *psdev)
664 {
665 struct xenbus_transaction xbt;
666 int err;
667 char nodename[PCI_NODENAME_MAX];
668
669 BUG_ON(!psdev);
670 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
671 psdev->pdev->xdev->otherend_id);
672
673 again:
674 err = xenbus_transaction_start(&xbt);
675 if (err) {
676 dev_err(&psdev->dev->dev,
677 "error %d when start xenbus transaction\n", err);
678 return;
679 }
680 /*PV AER handlers will set this flag*/
681 xenbus_printf(xbt, nodename, "aerState" , "aerfail");
682 err = xenbus_transaction_end(xbt, 0);
683 if (err) {
684 if (err == -EAGAIN)
685 goto again;
686 dev_err(&psdev->dev->dev,
687 "error %d when end xenbus transaction\n", err);
688 return;
689 }
690 }
691
692 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
693 * backend need to have cooperation. In xen_pcibk, those steps will do similar
694 * jobs: send service request and waiting for front_end response.
695 */
696 static pci_ers_result_t common_process(struct pcistub_device *psdev,
697 pci_channel_state_t state, int aer_cmd,
698 pci_ers_result_t result)
699 {
700 pci_ers_result_t res = result;
701 struct xen_pcie_aer_op *aer_op;
702 struct xen_pcibk_device *pdev = psdev->pdev;
703 struct xen_pci_sharedinfo *sh_info = pdev->sh_info;
704 int ret;
705
706 /*with PV AER drivers*/
707 aer_op = &(sh_info->aer_op);
708 aer_op->cmd = aer_cmd ;
709 /*useful for error_detected callback*/
710 aer_op->err = state;
711 /*pcifront_end BDF*/
712 ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
713 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
714 if (!ret) {
715 dev_err(&psdev->dev->dev, "failed to get pcifront device\n");
716 return PCI_ERS_RESULT_NONE;
717 }
718 wmb();
719
720 dev_dbg(&psdev->dev->dev, "aer_op %x dom %x bus %x devfn %x\n",
721 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
722 /*local flag to mark there's aer request, xen_pcibk callback will use
723 * this flag to judge whether we need to check pci-front give aer
724 * service ack signal
725 */
726 set_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags);
727
728 /*It is possible that a pcifront conf_read_write ops request invokes
729 * the callback which cause the spurious execution of wake_up.
730 * Yet it is harmless and better than a spinlock here
731 */
732 set_bit(_XEN_PCIB_active,
733 (unsigned long *)&sh_info->flags);
734 wmb();
735 notify_remote_via_irq(pdev->evtchn_irq);
736
737 /* Enable IRQ to signal "request done". */
738 xen_pcibk_lateeoi(pdev, 0);
739
740 ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
741 !(test_bit(_XEN_PCIB_active, (unsigned long *)
742 &sh_info->flags)), 300*HZ);
743
744 /* Enable IRQ for pcifront request if not already active. */
745 if (!test_bit(_PDEVF_op_active, &pdev->flags))
746 xen_pcibk_lateeoi(pdev, 0);
747
748 if (!ret) {
749 if (test_bit(_XEN_PCIB_active,
750 (unsigned long *)&sh_info->flags)) {
751 dev_err(&psdev->dev->dev,
752 "pcifront aer process not responding!\n");
753 clear_bit(_XEN_PCIB_active,
754 (unsigned long *)&sh_info->flags);
755 aer_op->err = PCI_ERS_RESULT_NONE;
756 return res;
757 }
758 }
759 clear_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags);
760
761 res = (pci_ers_result_t)aer_op->err;
762 return res;
763 }
764
765 /*
766 * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case
767 * of the device driver could provide this service, and then wait for pcifront
768 * ack.
769 * @dev: pointer to PCI devices
770 * return value is used by aer_core do_recovery policy
771 */
772 static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
773 {
774 struct pcistub_device *psdev;
775 pci_ers_result_t result;
776
777 result = PCI_ERS_RESULT_RECOVERED;
778 dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
779 dev->bus->number, dev->devfn);
780
781 down_write(&pcistub_sem);
782 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
783 dev->bus->number,
784 PCI_SLOT(dev->devfn),
785 PCI_FUNC(dev->devfn));
786
787 if (!psdev || !psdev->pdev) {
788 dev_err(&dev->dev, "device is not found/assigned\n");
789 goto end;
790 }
791
792 if (!psdev->pdev->sh_info) {
793 dev_err(&dev->dev, "device is not connected or owned"
794 " by HVM, kill it\n");
795 kill_domain_by_device(psdev);
796 goto end;
797 }
798
799 if (!test_bit(_XEN_PCIB_AERHANDLER,
800 (unsigned long *)&psdev->pdev->sh_info->flags)) {
801 dev_err(&dev->dev,
802 "guest with no AER driver should have been killed\n");
803 goto end;
804 }
805 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
806
807 if (result == PCI_ERS_RESULT_NONE ||
808 result == PCI_ERS_RESULT_DISCONNECT) {
809 dev_dbg(&dev->dev,
810 "No AER slot_reset service or disconnected!\n");
811 kill_domain_by_device(psdev);
812 }
813 end:
814 if (psdev)
815 pcistub_device_put(psdev);
816 up_write(&pcistub_sem);
817 return result;
818
819 }
820
821
822 /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront
823 * in case of the device driver could provide this service, and then wait
824 * for pcifront ack
825 * @dev: pointer to PCI devices
826 * return value is used by aer_core do_recovery policy
827 */
828
829 static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
830 {
831 struct pcistub_device *psdev;
832 pci_ers_result_t result;
833
834 result = PCI_ERS_RESULT_RECOVERED;
835 dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
836 dev->bus->number, dev->devfn);
837
838 down_write(&pcistub_sem);
839 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
840 dev->bus->number,
841 PCI_SLOT(dev->devfn),
842 PCI_FUNC(dev->devfn));
843
844 if (!psdev || !psdev->pdev) {
845 dev_err(&dev->dev, "device is not found/assigned\n");
846 goto end;
847 }
848
849 if (!psdev->pdev->sh_info) {
850 dev_err(&dev->dev, "device is not connected or owned"
851 " by HVM, kill it\n");
852 kill_domain_by_device(psdev);
853 goto end;
854 }
855
856 if (!test_bit(_XEN_PCIB_AERHANDLER,
857 (unsigned long *)&psdev->pdev->sh_info->flags)) {
858 dev_err(&dev->dev,
859 "guest with no AER driver should have been killed\n");
860 goto end;
861 }
862 result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
863
864 if (result == PCI_ERS_RESULT_NONE ||
865 result == PCI_ERS_RESULT_DISCONNECT) {
866 dev_dbg(&dev->dev,
867 "No AER mmio_enabled service or disconnected!\n");
868 kill_domain_by_device(psdev);
869 }
870 end:
871 if (psdev)
872 pcistub_device_put(psdev);
873 up_write(&pcistub_sem);
874 return result;
875 }
876
877 /*xen_pcibk_error_detected: it will send the error_detected request to pcifront
878 * in case of the device driver could provide this service, and then wait
879 * for pcifront ack.
880 * @dev: pointer to PCI devices
881 * @error: the current PCI connection state
882 * return value is used by aer_core do_recovery policy
883 */
884
885 static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev,
886 pci_channel_state_t error)
887 {
888 struct pcistub_device *psdev;
889 pci_ers_result_t result;
890
891 result = PCI_ERS_RESULT_CAN_RECOVER;
892 dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n",
893 dev->bus->number, dev->devfn);
894
895 down_write(&pcistub_sem);
896 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
897 dev->bus->number,
898 PCI_SLOT(dev->devfn),
899 PCI_FUNC(dev->devfn));
900
901 if (!psdev || !psdev->pdev) {
902 dev_err(&dev->dev, "device is not found/assigned\n");
903 goto end;
904 }
905
906 if (!psdev->pdev->sh_info) {
907 dev_err(&dev->dev, "device is not connected or owned"
908 " by HVM, kill it\n");
909 kill_domain_by_device(psdev);
910 goto end;
911 }
912
913 /*Guest owns the device yet no aer handler regiested, kill guest*/
914 if (!test_bit(_XEN_PCIB_AERHANDLER,
915 (unsigned long *)&psdev->pdev->sh_info->flags)) {
916 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
917 kill_domain_by_device(psdev);
918 goto end;
919 }
920 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
921
922 if (result == PCI_ERS_RESULT_NONE ||
923 result == PCI_ERS_RESULT_DISCONNECT) {
924 dev_dbg(&dev->dev,
925 "No AER error_detected service or disconnected!\n");
926 kill_domain_by_device(psdev);
927 }
928 end:
929 if (psdev)
930 pcistub_device_put(psdev);
931 up_write(&pcistub_sem);
932 return result;
933 }
934
935 /*xen_pcibk_error_resume: it will send the error_resume request to pcifront
936 * in case of the device driver could provide this service, and then wait
937 * for pcifront ack.
938 * @dev: pointer to PCI devices
939 */
940
941 static void xen_pcibk_error_resume(struct pci_dev *dev)
942 {
943 struct pcistub_device *psdev;
944
945 dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
946 dev->bus->number, dev->devfn);
947
948 down_write(&pcistub_sem);
949 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
950 dev->bus->number,
951 PCI_SLOT(dev->devfn),
952 PCI_FUNC(dev->devfn));
953
954 if (!psdev || !psdev->pdev) {
955 dev_err(&dev->dev, "device is not found/assigned\n");
956 goto end;
957 }
958
959 if (!psdev->pdev->sh_info) {
960 dev_err(&dev->dev, "device is not connected or owned"
961 " by HVM, kill it\n");
962 kill_domain_by_device(psdev);
963 goto end;
964 }
965
966 if (!test_bit(_XEN_PCIB_AERHANDLER,
967 (unsigned long *)&psdev->pdev->sh_info->flags)) {
968 dev_err(&dev->dev,
969 "guest with no AER driver should have been killed\n");
970 kill_domain_by_device(psdev);
971 goto end;
972 }
973 common_process(psdev, 1, XEN_PCI_OP_aer_resume,
974 PCI_ERS_RESULT_RECOVERED);
975 end:
976 if (psdev)
977 pcistub_device_put(psdev);
978 up_write(&pcistub_sem);
979 return;
980 }
981
982 /*add xen_pcibk AER handling*/
983 static const struct pci_error_handlers xen_pcibk_error_handler = {
984 .error_detected = xen_pcibk_error_detected,
985 .mmio_enabled = xen_pcibk_mmio_enabled,
986 .slot_reset = xen_pcibk_slot_reset,
987 .resume = xen_pcibk_error_resume,
988 };
989
990 /*
991 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
992 * for a normal device. I don't want it to be loaded automatically.
993 */
994
995 static struct pci_driver xen_pcibk_pci_driver = {
996 /* The name should be xen_pciback, but until the tools are updated
997 * we will keep it as pciback. */
998 .name = PCISTUB_DRIVER_NAME,
999 .id_table = pcistub_ids,
1000 .probe = pcistub_probe,
1001 .remove = pcistub_remove,
1002 .err_handler = &xen_pcibk_error_handler,
1003 };
1004
1005 static inline int str_to_slot(const char *buf, int *domain, int *bus,
1006 int *slot, int *func)
1007 {
1008 int parsed = 0;
1009
1010 switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func,
1011 &parsed)) {
1012 case 3:
1013 *func = -1;
1014 sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed);
1015 break;
1016 case 2:
1017 *slot = *func = -1;
1018 sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed);
1019 break;
1020 }
1021 if (parsed && !buf[parsed])
1022 return 0;
1023
1024 /* try again without domain */
1025 *domain = 0;
1026 switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) {
1027 case 2:
1028 *func = -1;
1029 sscanf(buf, " %x:%x.* %n", bus, slot, &parsed);
1030 break;
1031 case 1:
1032 *slot = *func = -1;
1033 sscanf(buf, " %x:*.* %n", bus, &parsed);
1034 break;
1035 }
1036 if (parsed && !buf[parsed])
1037 return 0;
1038
1039 return -EINVAL;
1040 }
1041
1042 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
1043 *slot, int *func, int *reg, int *size, int *mask)
1044 {
1045 int parsed = 0;
1046
1047 sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func,
1048 reg, size, mask, &parsed);
1049 if (parsed && !buf[parsed])
1050 return 0;
1051
1052 /* try again without domain */
1053 *domain = 0;
1054 sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size,
1055 mask, &parsed);
1056 if (parsed && !buf[parsed])
1057 return 0;
1058
1059 return -EINVAL;
1060 }
1061
1062 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
1063 {
1064 struct pcistub_device_id *pci_dev_id;
1065 int rc = 0, devfn = PCI_DEVFN(slot, func);
1066
1067 if (slot < 0) {
1068 for (slot = 0; !rc && slot < 32; ++slot)
1069 rc = pcistub_device_id_add(domain, bus, slot, func);
1070 return rc;
1071 }
1072
1073 if (func < 0) {
1074 for (func = 0; !rc && func < 8; ++func)
1075 rc = pcistub_device_id_add(domain, bus, slot, func);
1076 return rc;
1077 }
1078
1079 if ((
1080 #if !defined(MODULE) /* pci_domains_supported is not being exported */ \
1081 || !defined(CONFIG_PCI_DOMAINS)
1082 !pci_domains_supported ? domain :
1083 #endif
1084 domain < 0 || domain > 0xffff)
1085 || bus < 0 || bus > 0xff
1086 || PCI_SLOT(devfn) != slot
1087 || PCI_FUNC(devfn) != func)
1088 return -EINVAL;
1089
1090 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
1091 if (!pci_dev_id)
1092 return -ENOMEM;
1093
1094 pr_debug("wants to seize %04x:%02x:%02x.%d\n",
1095 domain, bus, slot, func);
1096
1097 pcistub_device_id_add_list(pci_dev_id, domain, bus, devfn);
1098
1099 return 0;
1100 }
1101
1102 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
1103 {
1104 struct pcistub_device_id *pci_dev_id, *t;
1105 int err = -ENOENT;
1106 unsigned long flags;
1107
1108 spin_lock_irqsave(&device_ids_lock, flags);
1109 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
1110 slot_list) {
1111 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus
1112 && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot)
1113 && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) {
1114 /* Don't break; here because it's possible the same
1115 * slot could be in the list more than once
1116 */
1117 list_del(&pci_dev_id->slot_list);
1118 kfree(pci_dev_id);
1119
1120 err = 0;
1121
1122 pr_debug("removed %04x:%02x:%02x.%d from seize list\n",
1123 domain, bus, slot, func);
1124 }
1125 }
1126 spin_unlock_irqrestore(&device_ids_lock, flags);
1127
1128 return err;
1129 }
1130
1131 static int pcistub_reg_add(int domain, int bus, int slot, int func,
1132 unsigned int reg, unsigned int size,
1133 unsigned int mask)
1134 {
1135 int err = 0;
1136 struct pcistub_device *psdev;
1137 struct pci_dev *dev;
1138 struct config_field *field;
1139
1140 if (reg > 0xfff || (size < 4 && (mask >> (size * 8))))
1141 return -EINVAL;
1142
1143 psdev = pcistub_device_find(domain, bus, slot, func);
1144 if (!psdev) {
1145 err = -ENODEV;
1146 goto out;
1147 }
1148 dev = psdev->dev;
1149
1150 field = kzalloc(sizeof(*field), GFP_KERNEL);
1151 if (!field) {
1152 err = -ENOMEM;
1153 goto out;
1154 }
1155
1156 field->offset = reg;
1157 field->size = size;
1158 field->mask = mask;
1159 field->init = NULL;
1160 field->reset = NULL;
1161 field->release = NULL;
1162 field->clean = xen_pcibk_config_field_free;
1163
1164 err = xen_pcibk_config_quirks_add_field(dev, field);
1165 if (err)
1166 kfree(field);
1167 out:
1168 if (psdev)
1169 pcistub_device_put(psdev);
1170 return err;
1171 }
1172
1173 static ssize_t new_slot_store(struct device_driver *drv, const char *buf,
1174 size_t count)
1175 {
1176 int domain, bus, slot, func;
1177 int err;
1178
1179 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1180 if (err)
1181 goto out;
1182
1183 err = pcistub_device_id_add(domain, bus, slot, func);
1184
1185 out:
1186 if (!err)
1187 err = count;
1188 return err;
1189 }
1190 static DRIVER_ATTR_WO(new_slot);
1191
1192 static ssize_t remove_slot_store(struct device_driver *drv, const char *buf,
1193 size_t count)
1194 {
1195 int domain, bus, slot, func;
1196 int err;
1197
1198 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1199 if (err)
1200 goto out;
1201
1202 err = pcistub_device_id_remove(domain, bus, slot, func);
1203
1204 out:
1205 if (!err)
1206 err = count;
1207 return err;
1208 }
1209 static DRIVER_ATTR_WO(remove_slot);
1210
1211 static ssize_t slots_show(struct device_driver *drv, char *buf)
1212 {
1213 struct pcistub_device_id *pci_dev_id;
1214 size_t count = 0;
1215 unsigned long flags;
1216
1217 spin_lock_irqsave(&device_ids_lock, flags);
1218 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1219 if (count >= PAGE_SIZE)
1220 break;
1221
1222 count += scnprintf(buf + count, PAGE_SIZE - count,
1223 "%04x:%02x:%02x.%d\n",
1224 pci_dev_id->domain, pci_dev_id->bus,
1225 PCI_SLOT(pci_dev_id->devfn),
1226 PCI_FUNC(pci_dev_id->devfn));
1227 }
1228 spin_unlock_irqrestore(&device_ids_lock, flags);
1229
1230 return count;
1231 }
1232 static DRIVER_ATTR_RO(slots);
1233
1234 static ssize_t irq_handlers_show(struct device_driver *drv, char *buf)
1235 {
1236 struct pcistub_device *psdev;
1237 struct xen_pcibk_dev_data *dev_data;
1238 size_t count = 0;
1239 unsigned long flags;
1240
1241 spin_lock_irqsave(&pcistub_devices_lock, flags);
1242 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1243 if (count >= PAGE_SIZE)
1244 break;
1245 if (!psdev->dev)
1246 continue;
1247 dev_data = pci_get_drvdata(psdev->dev);
1248 if (!dev_data)
1249 continue;
1250 count +=
1251 scnprintf(buf + count, PAGE_SIZE - count,
1252 "%s:%s:%sing:%ld\n",
1253 pci_name(psdev->dev),
1254 dev_data->isr_on ? "on" : "off",
1255 dev_data->ack_intr ? "ack" : "not ack",
1256 dev_data->handled);
1257 }
1258 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1259 return count;
1260 }
1261 static DRIVER_ATTR_RO(irq_handlers);
1262
1263 static ssize_t irq_handler_state_store(struct device_driver *drv,
1264 const char *buf, size_t count)
1265 {
1266 struct pcistub_device *psdev;
1267 struct xen_pcibk_dev_data *dev_data;
1268 int domain, bus, slot, func;
1269 int err;
1270
1271 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1272 if (err)
1273 return err;
1274
1275 psdev = pcistub_device_find(domain, bus, slot, func);
1276 if (!psdev) {
1277 err = -ENOENT;
1278 goto out;
1279 }
1280
1281 dev_data = pci_get_drvdata(psdev->dev);
1282 if (!dev_data) {
1283 err = -ENOENT;
1284 goto out;
1285 }
1286
1287 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
1288 dev_data->irq_name, dev_data->isr_on,
1289 !dev_data->isr_on);
1290
1291 dev_data->isr_on = !(dev_data->isr_on);
1292 if (dev_data->isr_on)
1293 dev_data->ack_intr = 1;
1294 out:
1295 if (psdev)
1296 pcistub_device_put(psdev);
1297 if (!err)
1298 err = count;
1299 return err;
1300 }
1301 static DRIVER_ATTR_WO(irq_handler_state);
1302
1303 static ssize_t quirks_store(struct device_driver *drv, const char *buf,
1304 size_t count)
1305 {
1306 int domain, bus, slot, func, reg, size, mask;
1307 int err;
1308
1309 err = str_to_quirk(buf, &domain, &bus, &slot, &func, &reg, &size,
1310 &mask);
1311 if (err)
1312 goto out;
1313
1314 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1315
1316 out:
1317 if (!err)
1318 err = count;
1319 return err;
1320 }
1321
1322 static ssize_t quirks_show(struct device_driver *drv, char *buf)
1323 {
1324 int count = 0;
1325 unsigned long flags;
1326 struct xen_pcibk_config_quirk *quirk;
1327 struct xen_pcibk_dev_data *dev_data;
1328 const struct config_field *field;
1329 const struct config_field_entry *cfg_entry;
1330
1331 spin_lock_irqsave(&device_ids_lock, flags);
1332 list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
1333 if (count >= PAGE_SIZE)
1334 goto out;
1335
1336 count += scnprintf(buf + count, PAGE_SIZE - count,
1337 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1338 quirk->pdev->bus->number,
1339 PCI_SLOT(quirk->pdev->devfn),
1340 PCI_FUNC(quirk->pdev->devfn),
1341 quirk->devid.vendor, quirk->devid.device,
1342 quirk->devid.subvendor,
1343 quirk->devid.subdevice);
1344
1345 dev_data = pci_get_drvdata(quirk->pdev);
1346
1347 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1348 field = cfg_entry->field;
1349 if (count >= PAGE_SIZE)
1350 goto out;
1351
1352 count += scnprintf(buf + count, PAGE_SIZE - count,
1353 "\t\t%08x:%01x:%08x\n",
1354 cfg_entry->base_offset +
1355 field->offset, field->size,
1356 field->mask);
1357 }
1358 }
1359
1360 out:
1361 spin_unlock_irqrestore(&device_ids_lock, flags);
1362
1363 return count;
1364 }
1365 static DRIVER_ATTR_RW(quirks);
1366
1367 static ssize_t permissive_store(struct device_driver *drv, const char *buf,
1368 size_t count)
1369 {
1370 int domain, bus, slot, func;
1371 int err;
1372 struct pcistub_device *psdev;
1373 struct xen_pcibk_dev_data *dev_data;
1374
1375 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1376 if (err)
1377 goto out;
1378
1379 psdev = pcistub_device_find(domain, bus, slot, func);
1380 if (!psdev) {
1381 err = -ENODEV;
1382 goto out;
1383 }
1384
1385 dev_data = pci_get_drvdata(psdev->dev);
1386 /* the driver data for a device should never be null at this point */
1387 if (!dev_data) {
1388 err = -ENXIO;
1389 goto release;
1390 }
1391 if (!dev_data->permissive) {
1392 dev_data->permissive = 1;
1393 /* Let user know that what they're doing could be unsafe */
1394 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1395 "configuration space accesses!\n");
1396 dev_warn(&psdev->dev->dev,
1397 "permissive mode is potentially unsafe!\n");
1398 }
1399 release:
1400 pcistub_device_put(psdev);
1401 out:
1402 if (!err)
1403 err = count;
1404 return err;
1405 }
1406
1407 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1408 {
1409 struct pcistub_device *psdev;
1410 struct xen_pcibk_dev_data *dev_data;
1411 size_t count = 0;
1412 unsigned long flags;
1413 spin_lock_irqsave(&pcistub_devices_lock, flags);
1414 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1415 if (count >= PAGE_SIZE)
1416 break;
1417 if (!psdev->dev)
1418 continue;
1419 dev_data = pci_get_drvdata(psdev->dev);
1420 if (!dev_data || !dev_data->permissive)
1421 continue;
1422 count +=
1423 scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1424 pci_name(psdev->dev));
1425 }
1426 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1427 return count;
1428 }
1429 static DRIVER_ATTR_RW(permissive);
1430
1431 static ssize_t allow_interrupt_control_store(struct device_driver *drv,
1432 const char *buf, size_t count)
1433 {
1434 int domain, bus, slot, func;
1435 int err;
1436 struct pcistub_device *psdev;
1437 struct xen_pcibk_dev_data *dev_data;
1438
1439 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1440 if (err)
1441 goto out;
1442
1443 psdev = pcistub_device_find(domain, bus, slot, func);
1444 if (!psdev) {
1445 err = -ENODEV;
1446 goto out;
1447 }
1448
1449 dev_data = pci_get_drvdata(psdev->dev);
1450 /* the driver data for a device should never be null at this point */
1451 if (!dev_data) {
1452 err = -ENXIO;
1453 goto release;
1454 }
1455 dev_data->allow_interrupt_control = 1;
1456 release:
1457 pcistub_device_put(psdev);
1458 out:
1459 if (!err)
1460 err = count;
1461 return err;
1462 }
1463
1464 static ssize_t allow_interrupt_control_show(struct device_driver *drv,
1465 char *buf)
1466 {
1467 struct pcistub_device *psdev;
1468 struct xen_pcibk_dev_data *dev_data;
1469 size_t count = 0;
1470 unsigned long flags;
1471
1472 spin_lock_irqsave(&pcistub_devices_lock, flags);
1473 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1474 if (count >= PAGE_SIZE)
1475 break;
1476 if (!psdev->dev)
1477 continue;
1478 dev_data = pci_get_drvdata(psdev->dev);
1479 if (!dev_data || !dev_data->allow_interrupt_control)
1480 continue;
1481 count +=
1482 scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1483 pci_name(psdev->dev));
1484 }
1485 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1486 return count;
1487 }
1488 static DRIVER_ATTR_RW(allow_interrupt_control);
1489
1490 static void pcistub_exit(void)
1491 {
1492 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
1493 driver_remove_file(&xen_pcibk_pci_driver.driver,
1494 &driver_attr_remove_slot);
1495 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
1496 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
1497 driver_remove_file(&xen_pcibk_pci_driver.driver,
1498 &driver_attr_permissive);
1499 driver_remove_file(&xen_pcibk_pci_driver.driver,
1500 &driver_attr_allow_interrupt_control);
1501 driver_remove_file(&xen_pcibk_pci_driver.driver,
1502 &driver_attr_irq_handlers);
1503 driver_remove_file(&xen_pcibk_pci_driver.driver,
1504 &driver_attr_irq_handler_state);
1505 pci_unregister_driver(&xen_pcibk_pci_driver);
1506 }
1507
1508 static int __init pcistub_init(void)
1509 {
1510 int pos = 0;
1511 int err = 0;
1512 int domain, bus, slot, func;
1513 int parsed;
1514
1515 if (pci_devs_to_hide && *pci_devs_to_hide) {
1516 do {
1517 parsed = 0;
1518
1519 err = sscanf(pci_devs_to_hide + pos,
1520 " (%x:%x:%x.%x) %n",
1521 &domain, &bus, &slot, &func, &parsed);
1522 switch (err) {
1523 case 3:
1524 func = -1;
1525 sscanf(pci_devs_to_hide + pos,
1526 " (%x:%x:%x.*) %n",
1527 &domain, &bus, &slot, &parsed);
1528 break;
1529 case 2:
1530 slot = func = -1;
1531 sscanf(pci_devs_to_hide + pos,
1532 " (%x:%x:*.*) %n",
1533 &domain, &bus, &parsed);
1534 break;
1535 }
1536
1537 if (!parsed) {
1538 domain = 0;
1539 err = sscanf(pci_devs_to_hide + pos,
1540 " (%x:%x.%x) %n",
1541 &bus, &slot, &func, &parsed);
1542 switch (err) {
1543 case 2:
1544 func = -1;
1545 sscanf(pci_devs_to_hide + pos,
1546 " (%x:%x.*) %n",
1547 &bus, &slot, &parsed);
1548 break;
1549 case 1:
1550 slot = func = -1;
1551 sscanf(pci_devs_to_hide + pos,
1552 " (%x:*.*) %n",
1553 &bus, &parsed);
1554 break;
1555 }
1556 }
1557
1558 if (parsed <= 0)
1559 goto parse_error;
1560
1561 err = pcistub_device_id_add(domain, bus, slot, func);
1562 if (err)
1563 goto out;
1564
1565 pos += parsed;
1566 } while (pci_devs_to_hide[pos]);
1567 }
1568
1569 /* If we're the first PCI Device Driver to register, we're the
1570 * first one to get offered PCI devices as they become
1571 * available (and thus we can be the first to grab them)
1572 */
1573 err = pci_register_driver(&xen_pcibk_pci_driver);
1574 if (err < 0)
1575 goto out;
1576
1577 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1578 &driver_attr_new_slot);
1579 if (!err)
1580 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1581 &driver_attr_remove_slot);
1582 if (!err)
1583 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1584 &driver_attr_slots);
1585 if (!err)
1586 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1587 &driver_attr_quirks);
1588 if (!err)
1589 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1590 &driver_attr_permissive);
1591 if (!err)
1592 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1593 &driver_attr_allow_interrupt_control);
1594
1595 if (!err)
1596 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1597 &driver_attr_irq_handlers);
1598 if (!err)
1599 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1600 &driver_attr_irq_handler_state);
1601 if (err)
1602 pcistub_exit();
1603
1604 out:
1605 return err;
1606
1607 parse_error:
1608 pr_err("Error parsing pci_devs_to_hide at \"%s\"\n",
1609 pci_devs_to_hide + pos);
1610 return -EINVAL;
1611 }
1612
1613 #ifndef MODULE
1614 /*
1615 * fs_initcall happens before device_initcall
1616 * so xen_pcibk *should* get called first (b/c we
1617 * want to suck up any device before other drivers
1618 * get a chance by being the first pci device
1619 * driver to register)
1620 */
1621 fs_initcall(pcistub_init);
1622 #endif
1623
1624 #ifdef CONFIG_PCI_IOV
1625 static struct pcistub_device *find_vfs(const struct pci_dev *pdev)
1626 {
1627 struct pcistub_device *psdev = NULL;
1628 unsigned long flags;
1629 bool found = false;
1630
1631 spin_lock_irqsave(&pcistub_devices_lock, flags);
1632 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1633 if (!psdev->pdev && psdev->dev != pdev
1634 && pci_physfn(psdev->dev) == pdev) {
1635 found = true;
1636 break;
1637 }
1638 }
1639 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1640 if (found)
1641 return psdev;
1642 return NULL;
1643 }
1644
1645 static int pci_stub_notifier(struct notifier_block *nb,
1646 unsigned long action, void *data)
1647 {
1648 struct device *dev = data;
1649 const struct pci_dev *pdev = to_pci_dev(dev);
1650
1651 if (action != BUS_NOTIFY_UNBIND_DRIVER)
1652 return NOTIFY_DONE;
1653
1654 if (!pdev->is_physfn)
1655 return NOTIFY_DONE;
1656
1657 for (;;) {
1658 struct pcistub_device *psdev = find_vfs(pdev);
1659 if (!psdev)
1660 break;
1661 device_release_driver(&psdev->dev->dev);
1662 }
1663 return NOTIFY_DONE;
1664 }
1665
1666 static struct notifier_block pci_stub_nb = {
1667 .notifier_call = pci_stub_notifier,
1668 };
1669 #endif
1670
1671 static int __init xen_pcibk_init(void)
1672 {
1673 int err;
1674
1675 if (!xen_initial_domain())
1676 return -ENODEV;
1677
1678 err = xen_pcibk_config_init();
1679 if (err)
1680 return err;
1681
1682 #ifdef MODULE
1683 err = pcistub_init();
1684 if (err < 0)
1685 return err;
1686 #endif
1687
1688 pcistub_init_devices_late();
1689 err = xen_pcibk_xenbus_register();
1690 if (err)
1691 pcistub_exit();
1692 #ifdef CONFIG_PCI_IOV
1693 else
1694 bus_register_notifier(&pci_bus_type, &pci_stub_nb);
1695 #endif
1696
1697 return err;
1698 }
1699
1700 static void __exit xen_pcibk_cleanup(void)
1701 {
1702 #ifdef CONFIG_PCI_IOV
1703 bus_unregister_notifier(&pci_bus_type, &pci_stub_nb);
1704 #endif
1705 xen_pcibk_xenbus_unregister();
1706 pcistub_exit();
1707 }
1708
1709 module_init(xen_pcibk_init);
1710 module_exit(xen_pcibk_cleanup);
1711
1712 MODULE_LICENSE("Dual BSD/GPL");
1713 MODULE_ALIAS("xen-backend:pci");
Linux with added FPC-III support