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Linux 4.16.11
[linux/fpc-iii.git] / drivers / xen / xen-pciback / pci_stub.c
blob9e480fdebe1f059419e8864c473e3c6ee2f02cb4
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
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/rwsem.h>
13 #include <linux/list.h>
14 #include <linux/spinlock.h>
15 #include <linux/kref.h>
16 #include <linux/pci.h>
17 #include <linux/wait.h>
18 #include <linux/sched.h>
19 #include <linux/atomic.h>
20 #include <xen/events.h>
21 #include <asm/xen/pci.h>
22 #include <asm/xen/hypervisor.h>
23 #include <xen/interface/physdev.h>
24 #include "pciback.h"
25 #include "conf_space.h"
26 #include "conf_space_quirks.h"
27
28 #define PCISTUB_DRIVER_NAME "pciback"
29
30 static char *pci_devs_to_hide;
31 wait_queue_head_t xen_pcibk_aer_wait_queue;
32 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
33 * We want to avoid in middle of AER ops, xen_pcibk devices is being removed
34 */
35 static DECLARE_RWSEM(pcistub_sem);
36 module_param_named(hide, pci_devs_to_hide, charp, 0444);
37
38 struct pcistub_device_id {
39 struct list_head slot_list;
40 int domain;
41 unsigned char bus;
42 unsigned int devfn;
43 };
44 static LIST_HEAD(pcistub_device_ids);
45 static DEFINE_SPINLOCK(device_ids_lock);
46
47 struct pcistub_device {
48 struct kref kref;
49 struct list_head dev_list;
50 spinlock_t lock;
51
52 struct pci_dev *dev;
53 struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */
54 };
55
56 /* Access to pcistub_devices & seized_devices lists and the initialize_devices
57 * flag must be locked with pcistub_devices_lock
58 */
59 static DEFINE_SPINLOCK(pcistub_devices_lock);
60 static LIST_HEAD(pcistub_devices);
61
62 /* wait for device_initcall before initializing our devices
63 * (see pcistub_init_devices_late)
64 */
65 static int initialize_devices;
66 static LIST_HEAD(seized_devices);
67
68 static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
69 {
70 struct pcistub_device *psdev;
71
72 dev_dbg(&dev->dev, "pcistub_device_alloc\n");
73
74 psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC);
75 if (!psdev)
76 return NULL;
77
78 psdev->dev = pci_dev_get(dev);
79 if (!psdev->dev) {
80 kfree(psdev);
81 return NULL;
82 }
83
84 kref_init(&psdev->kref);
85 spin_lock_init(&psdev->lock);
86
87 return psdev;
88 }
89
90 /* Don't call this directly as it's called by pcistub_device_put */
91 static void pcistub_device_release(struct kref *kref)
92 {
93 struct pcistub_device *psdev;
94 struct pci_dev *dev;
95 struct xen_pcibk_dev_data *dev_data;
96
97 psdev = container_of(kref, struct pcistub_device, kref);
98 dev = psdev->dev;
99 dev_data = pci_get_drvdata(dev);
100
101 dev_dbg(&dev->dev, "pcistub_device_release\n");
102
103 xen_unregister_device_domain_owner(dev);
104
105 /* Call the reset function which does not take lock as this
106 * is called from "unbind" which takes a device_lock mutex.
107 */
108 __pci_reset_function_locked(dev);
109 if (pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state))
110 dev_info(&dev->dev, "Could not reload PCI state\n");
111 else
112 pci_restore_state(dev);
113
114 if (dev->msix_cap) {
115 struct physdev_pci_device ppdev = {
116 .seg = pci_domain_nr(dev->bus),
117 .bus = dev->bus->number,
118 .devfn = dev->devfn
119 };
120 int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix,
121 &ppdev);
122
123 if (err && err != -ENOSYS)
124 dev_warn(&dev->dev, "MSI-X release failed (%d)\n",
125 err);
126 }
127
128 /* Disable the device */
129 xen_pcibk_reset_device(dev);
130
131 kfree(dev_data);
132 pci_set_drvdata(dev, NULL);
133
134 /* Clean-up the device */
135 xen_pcibk_config_free_dyn_fields(dev);
136 xen_pcibk_config_free_dev(dev);
137
138 pci_clear_dev_assigned(dev);
139 pci_dev_put(dev);
140
141 kfree(psdev);
142 }
143
144 static inline void pcistub_device_get(struct pcistub_device *psdev)
145 {
146 kref_get(&psdev->kref);
147 }
148
149 static inline void pcistub_device_put(struct pcistub_device *psdev)
150 {
151 kref_put(&psdev->kref, pcistub_device_release);
152 }
153
154 static struct pcistub_device *pcistub_device_find_locked(int domain, int bus,
155 int slot, int func)
156 {
157 struct pcistub_device *psdev;
158
159 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
160 if (psdev->dev != NULL
161 && domain == pci_domain_nr(psdev->dev->bus)
162 && bus == psdev->dev->bus->number
163 && slot == PCI_SLOT(psdev->dev->devfn)
164 && func == PCI_FUNC(psdev->dev->devfn)) {
165 return psdev;
166 }
167 }
168
169 return NULL;
170 }
171
172 static struct pcistub_device *pcistub_device_find(int domain, int bus,
173 int slot, int func)
174 {
175 struct pcistub_device *psdev;
176 unsigned long flags;
177
178 spin_lock_irqsave(&pcistub_devices_lock, flags);
179
180 psdev = pcistub_device_find_locked(domain, bus, slot, func);
181 if (psdev)
182 pcistub_device_get(psdev);
183
184 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
185 return psdev;
186 }
187
188 static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
189 struct pcistub_device *psdev)
190 {
191 struct pci_dev *pci_dev = NULL;
192 unsigned long flags;
193
194 pcistub_device_get(psdev);
195
196 spin_lock_irqsave(&psdev->lock, flags);
197 if (!psdev->pdev) {
198 psdev->pdev = pdev;
199 pci_dev = psdev->dev;
200 }
201 spin_unlock_irqrestore(&psdev->lock, flags);
202
203 if (!pci_dev)
204 pcistub_device_put(psdev);
205
206 return pci_dev;
207 }
208
209 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
210 int domain, int bus,
211 int slot, int func)
212 {
213 struct pcistub_device *psdev;
214 struct pci_dev *found_dev = NULL;
215 unsigned long flags;
216
217 spin_lock_irqsave(&pcistub_devices_lock, flags);
218
219 psdev = pcistub_device_find_locked(domain, bus, slot, func);
220 if (psdev)
221 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
222
223 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
224 return found_dev;
225 }
226
227 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
228 struct pci_dev *dev)
229 {
230 struct pcistub_device *psdev;
231 struct pci_dev *found_dev = NULL;
232 unsigned long flags;
233
234 spin_lock_irqsave(&pcistub_devices_lock, flags);
235
236 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
237 if (psdev->dev == dev) {
238 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
239 break;
240 }
241 }
242
243 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
244 return found_dev;
245 }
246
247 /*
248 * Called when:
249 * - XenBus state has been reconfigure (pci unplug). See xen_pcibk_remove_device
250 * - XenBus state has been disconnected (guest shutdown). See xen_pcibk_xenbus_remove
251 * - 'echo BDF > unbind' on pciback module with no guest attached. See pcistub_remove
252 * - 'echo BDF > unbind' with a guest still using it. See pcistub_remove
253 *
254 * As such we have to be careful.
255 *
256 * To make this easier, the caller has to hold the device lock.
257 */
258 void pcistub_put_pci_dev(struct pci_dev *dev)
259 {
260 struct pcistub_device *psdev, *found_psdev = NULL;
261 unsigned long flags;
262 struct xen_pcibk_dev_data *dev_data;
263 int ret;
264
265 spin_lock_irqsave(&pcistub_devices_lock, flags);
266
267 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
268 if (psdev->dev == dev) {
269 found_psdev = psdev;
270 break;
271 }
272 }
273
274 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
275 if (WARN_ON(!found_psdev))
276 return;
277
278 /*hold this lock for avoiding breaking link between
279 * pcistub and xen_pcibk when AER is in processing
280 */
281 down_write(&pcistub_sem);
282 /* Cleanup our device
283 * (so it's ready for the next domain)
284 */
285 device_lock_assert(&dev->dev);
286 __pci_reset_function_locked(dev);
287
288 dev_data = pci_get_drvdata(dev);
289 ret = pci_load_saved_state(dev, dev_data->pci_saved_state);
290 if (!ret) {
291 /*
292 * The usual sequence is pci_save_state & pci_restore_state
293 * but the guest might have messed the configuration space up.
294 * Use the initial version (when device was bound to us).
295 */
296 pci_restore_state(dev);
297 } else
298 dev_info(&dev->dev, "Could not reload PCI state\n");
299 /* This disables the device. */
300 xen_pcibk_reset_device(dev);
301
302 /* And cleanup up our emulated fields. */
303 xen_pcibk_config_reset_dev(dev);
304 xen_pcibk_config_free_dyn_fields(dev);
305
306 xen_unregister_device_domain_owner(dev);
307
308 spin_lock_irqsave(&found_psdev->lock, flags);
309 found_psdev->pdev = NULL;
310 spin_unlock_irqrestore(&found_psdev->lock, flags);
311
312 pcistub_device_put(found_psdev);
313 up_write(&pcistub_sem);
314 }
315
316 static int pcistub_match_one(struct pci_dev *dev,
317 struct pcistub_device_id *pdev_id)
318 {
319 /* Match the specified device by domain, bus, slot, func and also if
320 * any of the device's parent bridges match.
321 */
322 for (; dev != NULL; dev = dev->bus->self) {
323 if (pci_domain_nr(dev->bus) == pdev_id->domain
324 && dev->bus->number == pdev_id->bus
325 && dev->devfn == pdev_id->devfn)
326 return 1;
327
328 /* Sometimes topmost bridge links to itself. */
329 if (dev == dev->bus->self)
330 break;
331 }
332
333 return 0;
334 }
335
336 static int pcistub_match(struct pci_dev *dev)
337 {
338 struct pcistub_device_id *pdev_id;
339 unsigned long flags;
340 int found = 0;
341
342 spin_lock_irqsave(&device_ids_lock, flags);
343 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
344 if (pcistub_match_one(dev, pdev_id)) {
345 found = 1;
346 break;
347 }
348 }
349 spin_unlock_irqrestore(&device_ids_lock, flags);
350
351 return found;
352 }
353
354 static int pcistub_init_device(struct pci_dev *dev)
355 {
356 struct xen_pcibk_dev_data *dev_data;
357 int err = 0;
358
359 dev_dbg(&dev->dev, "initializing...\n");
360
361 /* The PCI backend is not intended to be a module (or to work with
362 * removable PCI devices (yet). If it were, xen_pcibk_config_free()
363 * would need to be called somewhere to free the memory allocated
364 * here and then to call kfree(pci_get_drvdata(psdev->dev)).
365 */
366 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
367 + strlen(pci_name(dev)) + 1, GFP_ATOMIC);
368 if (!dev_data) {
369 err = -ENOMEM;
370 goto out;
371 }
372 pci_set_drvdata(dev, dev_data);
373
374 /*
375 * Setup name for fake IRQ handler. It will only be enabled
376 * once the device is turned on by the guest.
377 */
378 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
379
380 dev_dbg(&dev->dev, "initializing config\n");
381
382 init_waitqueue_head(&xen_pcibk_aer_wait_queue);
383 err = xen_pcibk_config_init_dev(dev);
384 if (err)
385 goto out;
386
387 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we
388 * must do this here because pcibios_enable_device may specify
389 * the pci device's true irq (and possibly its other resources)
390 * if they differ from what's in the configuration space.
391 * This makes the assumption that the device's resources won't
392 * change after this point (otherwise this code may break!)
393 */
394 dev_dbg(&dev->dev, "enabling device\n");
395 err = pci_enable_device(dev);
396 if (err)
397 goto config_release;
398
399 if (dev->msix_cap) {
400 struct physdev_pci_device ppdev = {
401 .seg = pci_domain_nr(dev->bus),
402 .bus = dev->bus->number,
403 .devfn = dev->devfn
404 };
405
406 err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev);
407 if (err && err != -ENOSYS)
408 dev_err(&dev->dev, "MSI-X preparation failed (%d)\n",
409 err);
410 }
411
412 /* We need the device active to save the state. */
413 dev_dbg(&dev->dev, "save state of device\n");
414 pci_save_state(dev);
415 dev_data->pci_saved_state = pci_store_saved_state(dev);
416 if (!dev_data->pci_saved_state)
417 dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
418 else {
419 dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n");
420 __pci_reset_function_locked(dev);
421 pci_restore_state(dev);
422 }
423 /* Now disable the device (this also ensures some private device
424 * data is setup before we export)
425 */
426 dev_dbg(&dev->dev, "reset device\n");
427 xen_pcibk_reset_device(dev);
428
429 pci_set_dev_assigned(dev);
430 return 0;
431
432 config_release:
433 xen_pcibk_config_free_dev(dev);
434
435 out:
436 pci_set_drvdata(dev, NULL);
437 kfree(dev_data);
438 return err;
439 }
440
441 /*
442 * Because some initialization still happens on
443 * devices during fs_initcall, we need to defer
444 * full initialization of our devices until
445 * device_initcall.
446 */
447 static int __init pcistub_init_devices_late(void)
448 {
449 struct pcistub_device *psdev;
450 unsigned long flags;
451 int err = 0;
452
453 spin_lock_irqsave(&pcistub_devices_lock, flags);
454
455 while (!list_empty(&seized_devices)) {
456 psdev = container_of(seized_devices.next,
457 struct pcistub_device, dev_list);
458 list_del(&psdev->dev_list);
459
460 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
461
462 err = pcistub_init_device(psdev->dev);
463 if (err) {
464 dev_err(&psdev->dev->dev,
465 "error %d initializing device\n", err);
466 kfree(psdev);
467 psdev = NULL;
468 }
469
470 spin_lock_irqsave(&pcistub_devices_lock, flags);
471
472 if (psdev)
473 list_add_tail(&psdev->dev_list, &pcistub_devices);
474 }
475
476 initialize_devices = 1;
477
478 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
479
480 return 0;
481 }
482
483 static void pcistub_device_id_add_list(struct pcistub_device_id *new,
484 int domain, int bus, unsigned int devfn)
485 {
486 struct pcistub_device_id *pci_dev_id;
487 unsigned long flags;
488 int found = 0;
489
490 spin_lock_irqsave(&device_ids_lock, flags);
491
492 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
493 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus &&
494 pci_dev_id->devfn == devfn) {
495 found = 1;
496 break;
497 }
498 }
499
500 if (!found) {
501 new->domain = domain;
502 new->bus = bus;
503 new->devfn = devfn;
504 list_add_tail(&new->slot_list, &pcistub_device_ids);
505 }
506
507 spin_unlock_irqrestore(&device_ids_lock, flags);
508
509 if (found)
510 kfree(new);
511 }
512
513 static int pcistub_seize(struct pci_dev *dev,
514 struct pcistub_device_id *pci_dev_id)
515 {
516 struct pcistub_device *psdev;
517 unsigned long flags;
518 int err = 0;
519
520 psdev = pcistub_device_alloc(dev);
521 if (!psdev) {
522 kfree(pci_dev_id);
523 return -ENOMEM;
524 }
525
526 spin_lock_irqsave(&pcistub_devices_lock, flags);
527
528 if (initialize_devices) {
529 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
530
531 /* don't want irqs disabled when calling pcistub_init_device */
532 err = pcistub_init_device(psdev->dev);
533
534 spin_lock_irqsave(&pcistub_devices_lock, flags);
535
536 if (!err)
537 list_add(&psdev->dev_list, &pcistub_devices);
538 } else {
539 dev_dbg(&dev->dev, "deferring initialization\n");
540 list_add(&psdev->dev_list, &seized_devices);
541 }
542
543 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
544
545 if (err) {
546 kfree(pci_dev_id);
547 pcistub_device_put(psdev);
548 } else if (pci_dev_id)
549 pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus),
550 dev->bus->number, dev->devfn);
551
552 return err;
553 }
554
555 /* Called when 'bind'. This means we must _NOT_ call pci_reset_function or
556 * other functions that take the sysfs lock. */
557 static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
558 {
559 int err = 0, match;
560 struct pcistub_device_id *pci_dev_id = NULL;
561
562 dev_dbg(&dev->dev, "probing...\n");
563
564 match = pcistub_match(dev);
565
566 if ((dev->driver_override &&
567 !strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) ||
568 match) {
569
570 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
571 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
572 dev_err(&dev->dev, "can't export pci devices that "
573 "don't have a normal (0) or bridge (1) "
574 "header type!\n");
575 err = -ENODEV;
576 goto out;
577 }
578
579 if (!match) {
580 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_ATOMIC);
581 if (!pci_dev_id) {
582 err = -ENOMEM;
583 goto out;
584 }
585 }
586
587 dev_info(&dev->dev, "seizing device\n");
588 err = pcistub_seize(dev, pci_dev_id);
589 } else
590 /* Didn't find the device */
591 err = -ENODEV;
592
593 out:
594 return err;
595 }
596
597 /* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or
598 * other functions that take the sysfs lock. */
599 static void pcistub_remove(struct pci_dev *dev)
600 {
601 struct pcistub_device *psdev, *found_psdev = NULL;
602 unsigned long flags;
603
604 dev_dbg(&dev->dev, "removing\n");
605
606 spin_lock_irqsave(&pcistub_devices_lock, flags);
607
608 xen_pcibk_config_quirk_release(dev);
609
610 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
611 if (psdev->dev == dev) {
612 found_psdev = psdev;
613 break;
614 }
615 }
616
617 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
618
619 if (found_psdev) {
620 dev_dbg(&dev->dev, "found device to remove %s\n",
621 found_psdev->pdev ? "- in-use" : "");
622
623 if (found_psdev->pdev) {
624 int domid = xen_find_device_domain_owner(dev);
625
626 pr_warn("****** removing device %s while still in-use by domain %d! ******\n",
627 pci_name(found_psdev->dev), domid);
628 pr_warn("****** driver domain may still access this device's i/o resources!\n");
629 pr_warn("****** shutdown driver domain before binding device\n");
630 pr_warn("****** to other drivers or domains\n");
631
632 /* N.B. This ends up calling pcistub_put_pci_dev which ends up
633 * doing the FLR. */
634 xen_pcibk_release_pci_dev(found_psdev->pdev,
635 found_psdev->dev,
636 false /* caller holds the lock. */);
637 }
638
639 spin_lock_irqsave(&pcistub_devices_lock, flags);
640 list_del(&found_psdev->dev_list);
641 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
642
643 /* the final put for releasing from the list */
644 pcistub_device_put(found_psdev);
645 }
646 }
647
648 static const struct pci_device_id pcistub_ids[] = {
649 {
650 .vendor = PCI_ANY_ID,
651 .device = PCI_ANY_ID,
652 .subvendor = PCI_ANY_ID,
653 .subdevice = PCI_ANY_ID,
654 },
655 {0,},
656 };
657
658 #define PCI_NODENAME_MAX 40
659 static void kill_domain_by_device(struct pcistub_device *psdev)
660 {
661 struct xenbus_transaction xbt;
662 int err;
663 char nodename[PCI_NODENAME_MAX];
664
665 BUG_ON(!psdev);
666 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
667 psdev->pdev->xdev->otherend_id);
668
669 again:
670 err = xenbus_transaction_start(&xbt);
671 if (err) {
672 dev_err(&psdev->dev->dev,
673 "error %d when start xenbus transaction\n", err);
674 return;
675 }
676 /*PV AER handlers will set this flag*/
677 xenbus_printf(xbt, nodename, "aerState" , "aerfail");
678 err = xenbus_transaction_end(xbt, 0);
679 if (err) {
680 if (err == -EAGAIN)
681 goto again;
682 dev_err(&psdev->dev->dev,
683 "error %d when end xenbus transaction\n", err);
684 return;
685 }
686 }
687
688 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
689 * backend need to have cooperation. In xen_pcibk, those steps will do similar
690 * jobs: send service request and waiting for front_end response.
691 */
692 static pci_ers_result_t common_process(struct pcistub_device *psdev,
693 pci_channel_state_t state, int aer_cmd,
694 pci_ers_result_t result)
695 {
696 pci_ers_result_t res = result;
697 struct xen_pcie_aer_op *aer_op;
698 struct xen_pcibk_device *pdev = psdev->pdev;
699 struct xen_pci_sharedinfo *sh_info = pdev->sh_info;
700 int ret;
701
702 /*with PV AER drivers*/
703 aer_op = &(sh_info->aer_op);
704 aer_op->cmd = aer_cmd ;
705 /*useful for error_detected callback*/
706 aer_op->err = state;
707 /*pcifront_end BDF*/
708 ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
709 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
710 if (!ret) {
711 dev_err(&psdev->dev->dev,
712 DRV_NAME ": failed to get pcifront device\n");
713 return PCI_ERS_RESULT_NONE;
714 }
715 wmb();
716
717 dev_dbg(&psdev->dev->dev,
718 DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n",
719 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
720 /*local flag to mark there's aer request, xen_pcibk callback will use
721 * this flag to judge whether we need to check pci-front give aer
722 * service ack signal
723 */
724 set_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags);
725
726 /*It is possible that a pcifront conf_read_write ops request invokes
727 * the callback which cause the spurious execution of wake_up.
728 * Yet it is harmless and better than a spinlock here
729 */
730 set_bit(_XEN_PCIB_active,
731 (unsigned long *)&sh_info->flags);
732 wmb();
733 notify_remote_via_irq(pdev->evtchn_irq);
734
735 ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
736 !(test_bit(_XEN_PCIB_active, (unsigned long *)
737 &sh_info->flags)), 300*HZ);
738
739 if (!ret) {
740 if (test_bit(_XEN_PCIB_active,
741 (unsigned long *)&sh_info->flags)) {
742 dev_err(&psdev->dev->dev,
743 "pcifront aer process not responding!\n");
744 clear_bit(_XEN_PCIB_active,
745 (unsigned long *)&sh_info->flags);
746 aer_op->err = PCI_ERS_RESULT_NONE;
747 return res;
748 }
749 }
750 clear_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags);
751
752 if (test_bit(_XEN_PCIF_active,
753 (unsigned long *)&sh_info->flags)) {
754 dev_dbg(&psdev->dev->dev,
755 "schedule pci_conf service in " DRV_NAME "\n");
756 xen_pcibk_test_and_schedule_op(psdev->pdev);
757 }
758
759 res = (pci_ers_result_t)aer_op->err;
760 return res;
761 }
762
763 /*
764 * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case
765 * of the device driver could provide this service, and then wait for pcifront
766 * ack.
767 * @dev: pointer to PCI devices
768 * return value is used by aer_core do_recovery policy
769 */
770 static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
771 {
772 struct pcistub_device *psdev;
773 pci_ers_result_t result;
774
775 result = PCI_ERS_RESULT_RECOVERED;
776 dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
777 dev->bus->number, dev->devfn);
778
779 down_write(&pcistub_sem);
780 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
781 dev->bus->number,
782 PCI_SLOT(dev->devfn),
783 PCI_FUNC(dev->devfn));
784
785 if (!psdev || !psdev->pdev) {
786 dev_err(&dev->dev,
787 DRV_NAME " device is not found/assigned\n");
788 goto end;
789 }
790
791 if (!psdev->pdev->sh_info) {
792 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
793 " by HVM, kill it\n");
794 kill_domain_by_device(psdev);
795 goto end;
796 }
797
798 if (!test_bit(_XEN_PCIB_AERHANDLER,
799 (unsigned long *)&psdev->pdev->sh_info->flags)) {
800 dev_err(&dev->dev,
801 "guest with no AER driver should have been killed\n");
802 goto end;
803 }
804 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
805
806 if (result == PCI_ERS_RESULT_NONE ||
807 result == PCI_ERS_RESULT_DISCONNECT) {
808 dev_dbg(&dev->dev,
809 "No AER slot_reset service or disconnected!\n");
810 kill_domain_by_device(psdev);
811 }
812 end:
813 if (psdev)
814 pcistub_device_put(psdev);
815 up_write(&pcistub_sem);
816 return result;
817
818 }
819
820
821 /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront
822 * in case of the device driver could provide this service, and then wait
823 * for pcifront ack
824 * @dev: pointer to PCI devices
825 * return value is used by aer_core do_recovery policy
826 */
827
828 static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
829 {
830 struct pcistub_device *psdev;
831 pci_ers_result_t result;
832
833 result = PCI_ERS_RESULT_RECOVERED;
834 dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
835 dev->bus->number, dev->devfn);
836
837 down_write(&pcistub_sem);
838 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
839 dev->bus->number,
840 PCI_SLOT(dev->devfn),
841 PCI_FUNC(dev->devfn));
842
843 if (!psdev || !psdev->pdev) {
844 dev_err(&dev->dev,
845 DRV_NAME " device is not found/assigned\n");
846 goto end;
847 }
848
849 if (!psdev->pdev->sh_info) {
850 dev_err(&dev->dev, DRV_NAME " 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,
903 DRV_NAME " device is not found/assigned\n");
904 goto end;
905 }
906
907 if (!psdev->pdev->sh_info) {
908 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
909 " by HVM, kill it\n");
910 kill_domain_by_device(psdev);
911 goto end;
912 }
913
914 /*Guest owns the device yet no aer handler regiested, kill guest*/
915 if (!test_bit(_XEN_PCIB_AERHANDLER,
916 (unsigned long *)&psdev->pdev->sh_info->flags)) {
917 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
918 kill_domain_by_device(psdev);
919 goto end;
920 }
921 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
922
923 if (result == PCI_ERS_RESULT_NONE ||
924 result == PCI_ERS_RESULT_DISCONNECT) {
925 dev_dbg(&dev->dev,
926 "No AER error_detected service or disconnected!\n");
927 kill_domain_by_device(psdev);
928 }
929 end:
930 if (psdev)
931 pcistub_device_put(psdev);
932 up_write(&pcistub_sem);
933 return result;
934 }
935
936 /*xen_pcibk_error_resume: it will send the error_resume request to pcifront
937 * in case of the device driver could provide this service, and then wait
938 * for pcifront ack.
939 * @dev: pointer to PCI devices
940 */
941
942 static void xen_pcibk_error_resume(struct pci_dev *dev)
943 {
944 struct pcistub_device *psdev;
945
946 dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
947 dev->bus->number, dev->devfn);
948
949 down_write(&pcistub_sem);
950 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
951 dev->bus->number,
952 PCI_SLOT(dev->devfn),
953 PCI_FUNC(dev->devfn));
954
955 if (!psdev || !psdev->pdev) {
956 dev_err(&dev->dev,
957 DRV_NAME " device is not found/assigned\n");
958 goto end;
959 }
960
961 if (!psdev->pdev->sh_info) {
962 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
963 " by HVM, kill it\n");
964 kill_domain_by_device(psdev);
965 goto end;
966 }
967
968 if (!test_bit(_XEN_PCIB_AERHANDLER,
969 (unsigned long *)&psdev->pdev->sh_info->flags)) {
970 dev_err(&dev->dev,
971 "guest with no AER driver should have been killed\n");
972 kill_domain_by_device(psdev);
973 goto end;
974 }
975 common_process(psdev, 1, XEN_PCI_OP_aer_resume,
976 PCI_ERS_RESULT_RECOVERED);
977 end:
978 if (psdev)
979 pcistub_device_put(psdev);
980 up_write(&pcistub_sem);
981 return;
982 }
983
984 /*add xen_pcibk AER handling*/
985 static const struct pci_error_handlers xen_pcibk_error_handler = {
986 .error_detected = xen_pcibk_error_detected,
987 .mmio_enabled = xen_pcibk_mmio_enabled,
988 .slot_reset = xen_pcibk_slot_reset,
989 .resume = xen_pcibk_error_resume,
990 };
991
992 /*
993 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
994 * for a normal device. I don't want it to be loaded automatically.
995 */
996
997 static struct pci_driver xen_pcibk_pci_driver = {
998 /* The name should be xen_pciback, but until the tools are updated
999 * we will keep it as pciback. */
1000 .name = PCISTUB_DRIVER_NAME,
1001 .id_table = pcistub_ids,
1002 .probe = pcistub_probe,
1003 .remove = pcistub_remove,
1004 .err_handler = &xen_pcibk_error_handler,
1005 };
1006
1007 static inline int str_to_slot(const char *buf, int *domain, int *bus,
1008 int *slot, int *func)
1009 {
1010 int parsed = 0;
1011
1012 switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func,
1013 &parsed)) {
1014 case 3:
1015 *func = -1;
1016 sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed);
1017 break;
1018 case 2:
1019 *slot = *func = -1;
1020 sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed);
1021 break;
1022 }
1023 if (parsed && !buf[parsed])
1024 return 0;
1025
1026 /* try again without domain */
1027 *domain = 0;
1028 switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) {
1029 case 2:
1030 *func = -1;
1031 sscanf(buf, " %x:%x.* %n", bus, slot, &parsed);
1032 break;
1033 case 1:
1034 *slot = *func = -1;
1035 sscanf(buf, " %x:*.* %n", bus, &parsed);
1036 break;
1037 }
1038 if (parsed && !buf[parsed])
1039 return 0;
1040
1041 return -EINVAL;
1042 }
1043
1044 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
1045 *slot, int *func, int *reg, int *size, int *mask)
1046 {
1047 int parsed = 0;
1048
1049 sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func,
1050 reg, size, mask, &parsed);
1051 if (parsed && !buf[parsed])
1052 return 0;
1053
1054 /* try again without domain */
1055 *domain = 0;
1056 sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size,
1057 mask, &parsed);
1058 if (parsed && !buf[parsed])
1059 return 0;
1060
1061 return -EINVAL;
1062 }
1063
1064 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
1065 {
1066 struct pcistub_device_id *pci_dev_id;
1067 int rc = 0, devfn = PCI_DEVFN(slot, func);
1068
1069 if (slot < 0) {
1070 for (slot = 0; !rc && slot < 32; ++slot)
1071 rc = pcistub_device_id_add(domain, bus, slot, func);
1072 return rc;
1073 }
1074
1075 if (func < 0) {
1076 for (func = 0; !rc && func < 8; ++func)
1077 rc = pcistub_device_id_add(domain, bus, slot, func);
1078 return rc;
1079 }
1080
1081 if ((
1082 #if !defined(MODULE) /* pci_domains_supported is not being exported */ \
1083 || !defined(CONFIG_PCI_DOMAINS)
1084 !pci_domains_supported ? domain :
1085 #endif
1086 domain < 0 || domain > 0xffff)
1087 || bus < 0 || bus > 0xff
1088 || PCI_SLOT(devfn) != slot
1089 || PCI_FUNC(devfn) != func)
1090 return -EINVAL;
1091
1092 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
1093 if (!pci_dev_id)
1094 return -ENOMEM;
1095
1096 pr_debug("wants to seize %04x:%02x:%02x.%d\n",
1097 domain, bus, slot, func);
1098
1099 pcistub_device_id_add_list(pci_dev_id, domain, bus, devfn);
1100
1101 return 0;
1102 }
1103
1104 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
1105 {
1106 struct pcistub_device_id *pci_dev_id, *t;
1107 int err = -ENOENT;
1108 unsigned long flags;
1109
1110 spin_lock_irqsave(&device_ids_lock, flags);
1111 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
1112 slot_list) {
1113 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus
1114 && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot)
1115 && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) {
1116 /* Don't break; here because it's possible the same
1117 * slot could be in the list more than once
1118 */
1119 list_del(&pci_dev_id->slot_list);
1120 kfree(pci_dev_id);
1121
1122 err = 0;
1123
1124 pr_debug("removed %04x:%02x:%02x.%d from seize list\n",
1125 domain, bus, slot, func);
1126 }
1127 }
1128 spin_unlock_irqrestore(&device_ids_lock, flags);
1129
1130 return err;
1131 }
1132
1133 static int pcistub_reg_add(int domain, int bus, int slot, int func,
1134 unsigned int reg, unsigned int size,
1135 unsigned int mask)
1136 {
1137 int err = 0;
1138 struct pcistub_device *psdev;
1139 struct pci_dev *dev;
1140 struct config_field *field;
1141
1142 if (reg > 0xfff || (size < 4 && (mask >> (size * 8))))
1143 return -EINVAL;
1144
1145 psdev = pcistub_device_find(domain, bus, slot, func);
1146 if (!psdev) {
1147 err = -ENODEV;
1148 goto out;
1149 }
1150 dev = psdev->dev;
1151
1152 field = kzalloc(sizeof(*field), GFP_ATOMIC);
1153 if (!field) {
1154 err = -ENOMEM;
1155 goto out;
1156 }
1157
1158 field->offset = reg;
1159 field->size = size;
1160 field->mask = mask;
1161 field->init = NULL;
1162 field->reset = NULL;
1163 field->release = NULL;
1164 field->clean = xen_pcibk_config_field_free;
1165
1166 err = xen_pcibk_config_quirks_add_field(dev, field);
1167 if (err)
1168 kfree(field);
1169 out:
1170 if (psdev)
1171 pcistub_device_put(psdev);
1172 return err;
1173 }
1174
1175 static ssize_t new_slot_store(struct device_driver *drv, const char *buf,
1176 size_t count)
1177 {
1178 int domain, bus, slot, func;
1179 int err;
1180
1181 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1182 if (err)
1183 goto out;
1184
1185 err = pcistub_device_id_add(domain, bus, slot, func);
1186
1187 out:
1188 if (!err)
1189 err = count;
1190 return err;
1191 }
1192 static DRIVER_ATTR_WO(new_slot);
1193
1194 static ssize_t remove_slot_store(struct device_driver *drv, const char *buf,
1195 size_t count)
1196 {
1197 int domain, bus, slot, func;
1198 int err;
1199
1200 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1201 if (err)
1202 goto out;
1203
1204 err = pcistub_device_id_remove(domain, bus, slot, func);
1205
1206 out:
1207 if (!err)
1208 err = count;
1209 return err;
1210 }
1211 static DRIVER_ATTR_WO(remove_slot);
1212
1213 static ssize_t slots_show(struct device_driver *drv, char *buf)
1214 {
1215 struct pcistub_device_id *pci_dev_id;
1216 size_t count = 0;
1217 unsigned long flags;
1218
1219 spin_lock_irqsave(&device_ids_lock, flags);
1220 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1221 if (count >= PAGE_SIZE)
1222 break;
1223
1224 count += scnprintf(buf + count, PAGE_SIZE - count,
1225 "%04x:%02x:%02x.%d\n",
1226 pci_dev_id->domain, pci_dev_id->bus,
1227 PCI_SLOT(pci_dev_id->devfn),
1228 PCI_FUNC(pci_dev_id->devfn));
1229 }
1230 spin_unlock_irqrestore(&device_ids_lock, flags);
1231
1232 return count;
1233 }
1234 static DRIVER_ATTR_RO(slots);
1235
1236 static ssize_t irq_handlers_show(struct device_driver *drv, char *buf)
1237 {
1238 struct pcistub_device *psdev;
1239 struct xen_pcibk_dev_data *dev_data;
1240 size_t count = 0;
1241 unsigned long flags;
1242
1243 spin_lock_irqsave(&pcistub_devices_lock, flags);
1244 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1245 if (count >= PAGE_SIZE)
1246 break;
1247 if (!psdev->dev)
1248 continue;
1249 dev_data = pci_get_drvdata(psdev->dev);
1250 if (!dev_data)
1251 continue;
1252 count +=
1253 scnprintf(buf + count, PAGE_SIZE - count,
1254 "%s:%s:%sing:%ld\n",
1255 pci_name(psdev->dev),
1256 dev_data->isr_on ? "on" : "off",
1257 dev_data->ack_intr ? "ack" : "not ack",
1258 dev_data->handled);
1259 }
1260 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1261 return count;
1262 }
1263 static DRIVER_ATTR_RO(irq_handlers);
1264
1265 static ssize_t irq_handler_state_store(struct device_driver *drv,
1266 const char *buf, size_t count)
1267 {
1268 struct pcistub_device *psdev;
1269 struct xen_pcibk_dev_data *dev_data;
1270 int domain, bus, slot, func;
1271 int err;
1272
1273 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1274 if (err)
1275 return err;
1276
1277 psdev = pcistub_device_find(domain, bus, slot, func);
1278 if (!psdev) {
1279 err = -ENOENT;
1280 goto out;
1281 }
1282
1283 dev_data = pci_get_drvdata(psdev->dev);
1284 if (!dev_data) {
1285 err = -ENOENT;
1286 goto out;
1287 }
1288
1289 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
1290 dev_data->irq_name, dev_data->isr_on,
1291 !dev_data->isr_on);
1292
1293 dev_data->isr_on = !(dev_data->isr_on);
1294 if (dev_data->isr_on)
1295 dev_data->ack_intr = 1;
1296 out:
1297 if (psdev)
1298 pcistub_device_put(psdev);
1299 if (!err)
1300 err = count;
1301 return err;
1302 }
1303 static DRIVER_ATTR_WO(irq_handler_state);
1304
1305 static ssize_t quirks_store(struct device_driver *drv, const char *buf,
1306 size_t count)
1307 {
1308 int domain, bus, slot, func, reg, size, mask;
1309 int err;
1310
1311 err = str_to_quirk(buf, &domain, &bus, &slot, &func, &reg, &size,
1312 &mask);
1313 if (err)
1314 goto out;
1315
1316 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1317
1318 out:
1319 if (!err)
1320 err = count;
1321 return err;
1322 }
1323
1324 static ssize_t quirks_show(struct device_driver *drv, char *buf)
1325 {
1326 int count = 0;
1327 unsigned long flags;
1328 struct xen_pcibk_config_quirk *quirk;
1329 struct xen_pcibk_dev_data *dev_data;
1330 const struct config_field *field;
1331 const struct config_field_entry *cfg_entry;
1332
1333 spin_lock_irqsave(&device_ids_lock, flags);
1334 list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
1335 if (count >= PAGE_SIZE)
1336 goto out;
1337
1338 count += scnprintf(buf + count, PAGE_SIZE - count,
1339 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1340 quirk->pdev->bus->number,
1341 PCI_SLOT(quirk->pdev->devfn),
1342 PCI_FUNC(quirk->pdev->devfn),
1343 quirk->devid.vendor, quirk->devid.device,
1344 quirk->devid.subvendor,
1345 quirk->devid.subdevice);
1346
1347 dev_data = pci_get_drvdata(quirk->pdev);
1348
1349 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1350 field = cfg_entry->field;
1351 if (count >= PAGE_SIZE)
1352 goto out;
1353
1354 count += scnprintf(buf + count, PAGE_SIZE - count,
1355 "\t\t%08x:%01x:%08x\n",
1356 cfg_entry->base_offset +
1357 field->offset, field->size,
1358 field->mask);
1359 }
1360 }
1361
1362 out:
1363 spin_unlock_irqrestore(&device_ids_lock, flags);
1364
1365 return count;
1366 }
1367 static DRIVER_ATTR_RW(quirks);
1368
1369 static ssize_t permissive_store(struct device_driver *drv, const char *buf,
1370 size_t count)
1371 {
1372 int domain, bus, slot, func;
1373 int err;
1374 struct pcistub_device *psdev;
1375 struct xen_pcibk_dev_data *dev_data;
1376
1377 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1378 if (err)
1379 goto out;
1380
1381 psdev = pcistub_device_find(domain, bus, slot, func);
1382 if (!psdev) {
1383 err = -ENODEV;
1384 goto out;
1385 }
1386
1387 dev_data = pci_get_drvdata(psdev->dev);
1388 /* the driver data for a device should never be null at this point */
1389 if (!dev_data) {
1390 err = -ENXIO;
1391 goto release;
1392 }
1393 if (!dev_data->permissive) {
1394 dev_data->permissive = 1;
1395 /* Let user know that what they're doing could be unsafe */
1396 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1397 "configuration space accesses!\n");
1398 dev_warn(&psdev->dev->dev,
1399 "permissive mode is potentially unsafe!\n");
1400 }
1401 release:
1402 pcistub_device_put(psdev);
1403 out:
1404 if (!err)
1405 err = count;
1406 return err;
1407 }
1408
1409 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1410 {
1411 struct pcistub_device *psdev;
1412 struct xen_pcibk_dev_data *dev_data;
1413 size_t count = 0;
1414 unsigned long flags;
1415 spin_lock_irqsave(&pcistub_devices_lock, flags);
1416 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1417 if (count >= PAGE_SIZE)
1418 break;
1419 if (!psdev->dev)
1420 continue;
1421 dev_data = pci_get_drvdata(psdev->dev);
1422 if (!dev_data || !dev_data->permissive)
1423 continue;
1424 count +=
1425 scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1426 pci_name(psdev->dev));
1427 }
1428 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1429 return count;
1430 }
1431 static DRIVER_ATTR_RW(permissive);
1432
1433 static void pcistub_exit(void)
1434 {
1435 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
1436 driver_remove_file(&xen_pcibk_pci_driver.driver,
1437 &driver_attr_remove_slot);
1438 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
1439 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
1440 driver_remove_file(&xen_pcibk_pci_driver.driver,
1441 &driver_attr_permissive);
1442 driver_remove_file(&xen_pcibk_pci_driver.driver,
1443 &driver_attr_irq_handlers);
1444 driver_remove_file(&xen_pcibk_pci_driver.driver,
1445 &driver_attr_irq_handler_state);
1446 pci_unregister_driver(&xen_pcibk_pci_driver);
1447 }
1448
1449 static int __init pcistub_init(void)
1450 {
1451 int pos = 0;
1452 int err = 0;
1453 int domain, bus, slot, func;
1454 int parsed;
1455
1456 if (pci_devs_to_hide && *pci_devs_to_hide) {
1457 do {
1458 parsed = 0;
1459
1460 err = sscanf(pci_devs_to_hide + pos,
1461 " (%x:%x:%x.%x) %n",
1462 &domain, &bus, &slot, &func, &parsed);
1463 switch (err) {
1464 case 3:
1465 func = -1;
1466 sscanf(pci_devs_to_hide + pos,
1467 " (%x:%x:%x.*) %n",
1468 &domain, &bus, &slot, &parsed);
1469 break;
1470 case 2:
1471 slot = func = -1;
1472 sscanf(pci_devs_to_hide + pos,
1473 " (%x:%x:*.*) %n",
1474 &domain, &bus, &parsed);
1475 break;
1476 }
1477
1478 if (!parsed) {
1479 domain = 0;
1480 err = sscanf(pci_devs_to_hide + pos,
1481 " (%x:%x.%x) %n",
1482 &bus, &slot, &func, &parsed);
1483 switch (err) {
1484 case 2:
1485 func = -1;
1486 sscanf(pci_devs_to_hide + pos,
1487 " (%x:%x.*) %n",
1488 &bus, &slot, &parsed);
1489 break;
1490 case 1:
1491 slot = func = -1;
1492 sscanf(pci_devs_to_hide + pos,
1493 " (%x:*.*) %n",
1494 &bus, &parsed);
1495 break;
1496 }
1497 }
1498
1499 if (parsed <= 0)
1500 goto parse_error;
1501
1502 err = pcistub_device_id_add(domain, bus, slot, func);
1503 if (err)
1504 goto out;
1505
1506 pos += parsed;
1507 } while (pci_devs_to_hide[pos]);
1508 }
1509
1510 /* If we're the first PCI Device Driver to register, we're the
1511 * first one to get offered PCI devices as they become
1512 * available (and thus we can be the first to grab them)
1513 */
1514 err = pci_register_driver(&xen_pcibk_pci_driver);
1515 if (err < 0)
1516 goto out;
1517
1518 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1519 &driver_attr_new_slot);
1520 if (!err)
1521 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1522 &driver_attr_remove_slot);
1523 if (!err)
1524 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1525 &driver_attr_slots);
1526 if (!err)
1527 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1528 &driver_attr_quirks);
1529 if (!err)
1530 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1531 &driver_attr_permissive);
1532
1533 if (!err)
1534 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1535 &driver_attr_irq_handlers);
1536 if (!err)
1537 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1538 &driver_attr_irq_handler_state);
1539 if (err)
1540 pcistub_exit();
1541
1542 out:
1543 return err;
1544
1545 parse_error:
1546 pr_err("Error parsing pci_devs_to_hide at \"%s\"\n",
1547 pci_devs_to_hide + pos);
1548 return -EINVAL;
1549 }
1550
1551 #ifndef MODULE
1552 /*
1553 * fs_initcall happens before device_initcall
1554 * so xen_pcibk *should* get called first (b/c we
1555 * want to suck up any device before other drivers
1556 * get a chance by being the first pci device
1557 * driver to register)
1558 */
1559 fs_initcall(pcistub_init);
1560 #endif
1561
1562 #ifdef CONFIG_PCI_IOV
1563 static struct pcistub_device *find_vfs(const struct pci_dev *pdev)
1564 {
1565 struct pcistub_device *psdev = NULL;
1566 unsigned long flags;
1567 bool found = false;
1568
1569 spin_lock_irqsave(&pcistub_devices_lock, flags);
1570 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1571 if (!psdev->pdev && psdev->dev != pdev
1572 && pci_physfn(psdev->dev) == pdev) {
1573 found = true;
1574 break;
1575 }
1576 }
1577 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1578 if (found)
1579 return psdev;
1580 return NULL;
1581 }
1582
1583 static int pci_stub_notifier(struct notifier_block *nb,
1584 unsigned long action, void *data)
1585 {
1586 struct device *dev = data;
1587 const struct pci_dev *pdev = to_pci_dev(dev);
1588
1589 if (action != BUS_NOTIFY_UNBIND_DRIVER)
1590 return NOTIFY_DONE;
1591
1592 if (!pdev->is_physfn)
1593 return NOTIFY_DONE;
1594
1595 for (;;) {
1596 struct pcistub_device *psdev = find_vfs(pdev);
1597 if (!psdev)
1598 break;
1599 device_release_driver(&psdev->dev->dev);
1600 }
1601 return NOTIFY_DONE;
1602 }
1603
1604 static struct notifier_block pci_stub_nb = {
1605 .notifier_call = pci_stub_notifier,
1606 };
1607 #endif
1608
1609 static int __init xen_pcibk_init(void)
1610 {
1611 int err;
1612
1613 if (!xen_initial_domain())
1614 return -ENODEV;
1615
1616 err = xen_pcibk_config_init();
1617 if (err)
1618 return err;
1619
1620 #ifdef MODULE
1621 err = pcistub_init();
1622 if (err < 0)
1623 return err;
1624 #endif
1625
1626 pcistub_init_devices_late();
1627 err = xen_pcibk_xenbus_register();
1628 if (err)
1629 pcistub_exit();
1630 #ifdef CONFIG_PCI_IOV
1631 else
1632 bus_register_notifier(&pci_bus_type, &pci_stub_nb);
1633 #endif
1634
1635 return err;
1636 }
1637
1638 static void __exit xen_pcibk_cleanup(void)
1639 {
1640 #ifdef CONFIG_PCI_IOV
1641 bus_unregister_notifier(&pci_bus_type, &pci_stub_nb);
1642 #endif
1643 xen_pcibk_xenbus_unregister();
1644 pcistub_exit();
1645 }
1646
1647 module_init(xen_pcibk_init);
1648 module_exit(xen_pcibk_cleanup);
1649
1650 MODULE_LICENSE("Dual BSD/GPL");
1651 MODULE_ALIAS("xen-backend:pci");
Linux with added FPC-III support