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xen/pciback: Allocate IRQ handler for device that is shared with guest.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / xen / xen-pciback / pci_stub.c
blobc4d1071ebbe64222175c32727825885ec253e6ee
1 /*
2 * PCI Stub Driver - Grabs devices in backend to be exported later
3 *
4 * Ryan Wilson <hap9@epoch.ncsc.mil>
5 * Chris Bookholt <hap10@epoch.ncsc.mil>
6 */
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/rwsem.h>
10 #include <linux/list.h>
11 #include <linux/spinlock.h>
12 #include <linux/kref.h>
13 #include <linux/pci.h>
14 #include <linux/wait.h>
15 #include <linux/sched.h>
16 #include <linux/atomic.h>
17 #include <xen/events.h>
18 #include <asm/xen/pci.h>
19 #include <asm/xen/hypervisor.h>
20 #include "pciback.h"
21 #include "conf_space.h"
22 #include "conf_space_quirks.h"
23
24 #define DRV_NAME "pciback"
25
26 static char *pci_devs_to_hide;
27 wait_queue_head_t aer_wait_queue;
28 /*Add sem for sync AER handling and pciback remove/reconfigue ops,
29 * We want to avoid in middle of AER ops, pciback devices is being removed
30 */
31 static DECLARE_RWSEM(pcistub_sem);
32 module_param_named(hide, pci_devs_to_hide, charp, 0444);
33
34 struct pcistub_device_id {
35 struct list_head slot_list;
36 int domain;
37 unsigned char bus;
38 unsigned int devfn;
39 };
40 static LIST_HEAD(pcistub_device_ids);
41 static DEFINE_SPINLOCK(device_ids_lock);
42
43 struct pcistub_device {
44 struct kref kref;
45 struct list_head dev_list;
46 spinlock_t lock;
47
48 struct pci_dev *dev;
49 struct pciback_device *pdev;/* non-NULL if struct pci_dev is in use */
50 };
51
52 /* Access to pcistub_devices & seized_devices lists and the initialize_devices
53 * flag must be locked with pcistub_devices_lock
54 */
55 static DEFINE_SPINLOCK(pcistub_devices_lock);
56 static LIST_HEAD(pcistub_devices);
57
58 /* wait for device_initcall before initializing our devices
59 * (see pcistub_init_devices_late)
60 */
61 static int initialize_devices;
62 static LIST_HEAD(seized_devices);
63
64 static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
65 {
66 struct pcistub_device *psdev;
67
68 dev_dbg(&dev->dev, "pcistub_device_alloc\n");
69
70 psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC);
71 if (!psdev)
72 return NULL;
73
74 psdev->dev = pci_dev_get(dev);
75 if (!psdev->dev) {
76 kfree(psdev);
77 return NULL;
78 }
79
80 kref_init(&psdev->kref);
81 spin_lock_init(&psdev->lock);
82
83 return psdev;
84 }
85
86 /* Don't call this directly as it's called by pcistub_device_put */
87 static void pcistub_device_release(struct kref *kref)
88 {
89 struct pcistub_device *psdev;
90
91 psdev = container_of(kref, struct pcistub_device, kref);
92
93 dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
94
95 xen_unregister_device_domain_owner(psdev->dev);
96
97 /* Clean-up the device */
98 pciback_reset_device(psdev->dev);
99 pciback_config_free_dyn_fields(psdev->dev);
100 pciback_config_free_dev(psdev->dev);
101 kfree(pci_get_drvdata(psdev->dev));
102 pci_set_drvdata(psdev->dev, NULL);
103
104 pci_dev_put(psdev->dev);
105
106 kfree(psdev);
107 }
108
109 static inline void pcistub_device_get(struct pcistub_device *psdev)
110 {
111 kref_get(&psdev->kref);
112 }
113
114 static inline void pcistub_device_put(struct pcistub_device *psdev)
115 {
116 kref_put(&psdev->kref, pcistub_device_release);
117 }
118
119 static struct pcistub_device *pcistub_device_find(int domain, int bus,
120 int slot, int func)
121 {
122 struct pcistub_device *psdev = NULL;
123 unsigned long flags;
124
125 spin_lock_irqsave(&pcistub_devices_lock, flags);
126
127 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
128 if (psdev->dev != NULL
129 && domain == pci_domain_nr(psdev->dev->bus)
130 && bus == psdev->dev->bus->number
131 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
132 pcistub_device_get(psdev);
133 goto out;
134 }
135 }
136
137 /* didn't find it */
138 psdev = NULL;
139
140 out:
141 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
142 return psdev;
143 }
144
145 static struct pci_dev *pcistub_device_get_pci_dev(struct pciback_device *pdev,
146 struct pcistub_device *psdev)
147 {
148 struct pci_dev *pci_dev = NULL;
149 unsigned long flags;
150
151 pcistub_device_get(psdev);
152
153 spin_lock_irqsave(&psdev->lock, flags);
154 if (!psdev->pdev) {
155 psdev->pdev = pdev;
156 pci_dev = psdev->dev;
157 }
158 spin_unlock_irqrestore(&psdev->lock, flags);
159
160 if (!pci_dev)
161 pcistub_device_put(psdev);
162
163 return pci_dev;
164 }
165
166 struct pci_dev *pcistub_get_pci_dev_by_slot(struct pciback_device *pdev,
167 int domain, int bus,
168 int slot, int func)
169 {
170 struct pcistub_device *psdev;
171 struct pci_dev *found_dev = NULL;
172 unsigned long flags;
173
174 spin_lock_irqsave(&pcistub_devices_lock, flags);
175
176 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
177 if (psdev->dev != NULL
178 && domain == pci_domain_nr(psdev->dev->bus)
179 && bus == psdev->dev->bus->number
180 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
181 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
182 break;
183 }
184 }
185
186 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
187 return found_dev;
188 }
189
190 struct pci_dev *pcistub_get_pci_dev(struct pciback_device *pdev,
191 struct pci_dev *dev)
192 {
193 struct pcistub_device *psdev;
194 struct pci_dev *found_dev = NULL;
195 unsigned long flags;
196
197 spin_lock_irqsave(&pcistub_devices_lock, flags);
198
199 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
200 if (psdev->dev == dev) {
201 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
202 break;
203 }
204 }
205
206 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
207 return found_dev;
208 }
209
210 void pcistub_put_pci_dev(struct pci_dev *dev)
211 {
212 struct pcistub_device *psdev, *found_psdev = NULL;
213 unsigned long flags;
214
215 spin_lock_irqsave(&pcistub_devices_lock, flags);
216
217 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
218 if (psdev->dev == dev) {
219 found_psdev = psdev;
220 break;
221 }
222 }
223
224 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
225
226 /*hold this lock for avoiding breaking link between
227 * pcistub and pciback when AER is in processing
228 */
229 down_write(&pcistub_sem);
230 /* Cleanup our device
231 * (so it's ready for the next domain)
232 */
233 pciback_reset_device(found_psdev->dev);
234 pciback_config_free_dyn_fields(found_psdev->dev);
235 pciback_config_reset_dev(found_psdev->dev);
236
237 spin_lock_irqsave(&found_psdev->lock, flags);
238 found_psdev->pdev = NULL;
239 spin_unlock_irqrestore(&found_psdev->lock, flags);
240
241 pcistub_device_put(found_psdev);
242 up_write(&pcistub_sem);
243 }
244
245 static int __devinit pcistub_match_one(struct pci_dev *dev,
246 struct pcistub_device_id *pdev_id)
247 {
248 /* Match the specified device by domain, bus, slot, func and also if
249 * any of the device's parent bridges match.
250 */
251 for (; dev != NULL; dev = dev->bus->self) {
252 if (pci_domain_nr(dev->bus) == pdev_id->domain
253 && dev->bus->number == pdev_id->bus
254 && dev->devfn == pdev_id->devfn)
255 return 1;
256
257 /* Sometimes topmost bridge links to itself. */
258 if (dev == dev->bus->self)
259 break;
260 }
261
262 return 0;
263 }
264
265 static int __devinit pcistub_match(struct pci_dev *dev)
266 {
267 struct pcistub_device_id *pdev_id;
268 unsigned long flags;
269 int found = 0;
270
271 spin_lock_irqsave(&device_ids_lock, flags);
272 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
273 if (pcistub_match_one(dev, pdev_id)) {
274 found = 1;
275 break;
276 }
277 }
278 spin_unlock_irqrestore(&device_ids_lock, flags);
279
280 return found;
281 }
282
283 static int __devinit pcistub_init_device(struct pci_dev *dev)
284 {
285 struct pciback_dev_data *dev_data;
286 int err = 0;
287
288 dev_dbg(&dev->dev, "initializing...\n");
289
290 /* The PCI backend is not intended to be a module (or to work with
291 * removable PCI devices (yet). If it were, pciback_config_free()
292 * would need to be called somewhere to free the memory allocated
293 * here and then to call kfree(pci_get_drvdata(psdev->dev)).
294 */
295 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
296 + strlen(pci_name(dev)) + 1, GFP_ATOMIC);
297 if (!dev_data) {
298 err = -ENOMEM;
299 goto out;
300 }
301 pci_set_drvdata(dev, dev_data);
302
303 /*
304 * Setup name for fake IRQ handler. It will only be enabled
305 * once the device is turned on by the guest.
306 */
307 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
308
309 dev_dbg(&dev->dev, "initializing config\n");
310
311 init_waitqueue_head(&aer_wait_queue);
312 err = pciback_config_init_dev(dev);
313 if (err)
314 goto out;
315
316 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we
317 * must do this here because pcibios_enable_device may specify
318 * the pci device's true irq (and possibly its other resources)
319 * if they differ from what's in the configuration space.
320 * This makes the assumption that the device's resources won't
321 * change after this point (otherwise this code may break!)
322 */
323 dev_dbg(&dev->dev, "enabling device\n");
324 err = pci_enable_device(dev);
325 if (err)
326 goto config_release;
327
328 /* Now disable the device (this also ensures some private device
329 * data is setup before we export)
330 */
331 dev_dbg(&dev->dev, "reset device\n");
332 pciback_reset_device(dev);
333
334 return 0;
335
336 config_release:
337 pciback_config_free_dev(dev);
338
339 out:
340 pci_set_drvdata(dev, NULL);
341 kfree(dev_data);
342 return err;
343 }
344
345 /*
346 * Because some initialization still happens on
347 * devices during fs_initcall, we need to defer
348 * full initialization of our devices until
349 * device_initcall.
350 */
351 static int __init pcistub_init_devices_late(void)
352 {
353 struct pcistub_device *psdev;
354 unsigned long flags;
355 int err = 0;
356
357 pr_debug("pciback: pcistub_init_devices_late\n");
358
359 spin_lock_irqsave(&pcistub_devices_lock, flags);
360
361 while (!list_empty(&seized_devices)) {
362 psdev = container_of(seized_devices.next,
363 struct pcistub_device, dev_list);
364 list_del(&psdev->dev_list);
365
366 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
367
368 err = pcistub_init_device(psdev->dev);
369 if (err) {
370 dev_err(&psdev->dev->dev,
371 "error %d initializing device\n", err);
372 kfree(psdev);
373 psdev = NULL;
374 }
375
376 spin_lock_irqsave(&pcistub_devices_lock, flags);
377
378 if (psdev)
379 list_add_tail(&psdev->dev_list, &pcistub_devices);
380 }
381
382 initialize_devices = 1;
383
384 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
385
386 return 0;
387 }
388
389 static int __devinit pcistub_seize(struct pci_dev *dev)
390 {
391 struct pcistub_device *psdev;
392 unsigned long flags;
393 int err = 0;
394
395 psdev = pcistub_device_alloc(dev);
396 if (!psdev)
397 return -ENOMEM;
398
399 spin_lock_irqsave(&pcistub_devices_lock, flags);
400
401 if (initialize_devices) {
402 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
403
404 /* don't want irqs disabled when calling pcistub_init_device */
405 err = pcistub_init_device(psdev->dev);
406
407 spin_lock_irqsave(&pcistub_devices_lock, flags);
408
409 if (!err)
410 list_add(&psdev->dev_list, &pcistub_devices);
411 } else {
412 dev_dbg(&dev->dev, "deferring initialization\n");
413 list_add(&psdev->dev_list, &seized_devices);
414 }
415
416 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
417
418 if (err)
419 pcistub_device_put(psdev);
420
421 return err;
422 }
423
424 static int __devinit pcistub_probe(struct pci_dev *dev,
425 const struct pci_device_id *id)
426 {
427 int err = 0;
428
429 dev_dbg(&dev->dev, "probing...\n");
430
431 if (pcistub_match(dev)) {
432
433 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
434 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
435 dev_err(&dev->dev, "can't export pci devices that "
436 "don't have a normal (0) or bridge (1) "
437 "header type!\n");
438 err = -ENODEV;
439 goto out;
440 }
441
442 dev_info(&dev->dev, "seizing device\n");
443 err = pcistub_seize(dev);
444 } else
445 /* Didn't find the device */
446 err = -ENODEV;
447
448 out:
449 return err;
450 }
451
452 static void pcistub_remove(struct pci_dev *dev)
453 {
454 struct pcistub_device *psdev, *found_psdev = NULL;
455 unsigned long flags;
456
457 dev_dbg(&dev->dev, "removing\n");
458
459 spin_lock_irqsave(&pcistub_devices_lock, flags);
460
461 pciback_config_quirk_release(dev);
462
463 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
464 if (psdev->dev == dev) {
465 found_psdev = psdev;
466 break;
467 }
468 }
469
470 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
471
472 if (found_psdev) {
473 dev_dbg(&dev->dev, "found device to remove - in use? %p\n",
474 found_psdev->pdev);
475
476 if (found_psdev->pdev) {
477 printk(KERN_WARNING "pciback: ****** removing device "
478 "%s while still in-use! ******\n",
479 pci_name(found_psdev->dev));
480 printk(KERN_WARNING "pciback: ****** driver domain may "
481 "still access this device's i/o resources!\n");
482 printk(KERN_WARNING "pciback: ****** shutdown driver "
483 "domain before binding device\n");
484 printk(KERN_WARNING "pciback: ****** to other drivers "
485 "or domains\n");
486
487 pciback_release_pci_dev(found_psdev->pdev,
488 found_psdev->dev);
489 }
490
491 spin_lock_irqsave(&pcistub_devices_lock, flags);
492 list_del(&found_psdev->dev_list);
493 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
494
495 /* the final put for releasing from the list */
496 pcistub_device_put(found_psdev);
497 }
498 }
499
500 static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = {
501 {
502 .vendor = PCI_ANY_ID,
503 .device = PCI_ANY_ID,
504 .subvendor = PCI_ANY_ID,
505 .subdevice = PCI_ANY_ID,
506 },
507 {0,},
508 };
509
510 #define PCI_NODENAME_MAX 40
511 static void kill_domain_by_device(struct pcistub_device *psdev)
512 {
513 struct xenbus_transaction xbt;
514 int err;
515 char nodename[PCI_NODENAME_MAX];
516
517 if (!psdev)
518 dev_err(&psdev->dev->dev,
519 "device is NULL when do AER recovery/kill_domain\n");
520 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
521 psdev->pdev->xdev->otherend_id);
522 nodename[strlen(nodename)] = '\0';
523
524 again:
525 err = xenbus_transaction_start(&xbt);
526 if (err) {
527 dev_err(&psdev->dev->dev,
528 "error %d when start xenbus transaction\n", err);
529 return;
530 }
531 /*PV AER handlers will set this flag*/
532 xenbus_printf(xbt, nodename, "aerState" , "aerfail");
533 err = xenbus_transaction_end(xbt, 0);
534 if (err) {
535 if (err == -EAGAIN)
536 goto again;
537 dev_err(&psdev->dev->dev,
538 "error %d when end xenbus transaction\n", err);
539 return;
540 }
541 }
542
543 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
544 * backend need to have cooperation. In pciback, those steps will do similar
545 * jobs: send service request and waiting for front_end response.
546 */
547 static pci_ers_result_t common_process(struct pcistub_device *psdev,
548 pci_channel_state_t state, int aer_cmd, pci_ers_result_t result)
549 {
550 pci_ers_result_t res = result;
551 struct xen_pcie_aer_op *aer_op;
552 int ret;
553
554 /*with PV AER drivers*/
555 aer_op = &(psdev->pdev->sh_info->aer_op);
556 aer_op->cmd = aer_cmd ;
557 /*useful for error_detected callback*/
558 aer_op->err = state;
559 /*pcifront_end BDF*/
560 ret = pciback_get_pcifront_dev(psdev->dev, psdev->pdev,
561 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
562 if (!ret) {
563 dev_err(&psdev->dev->dev,
564 "pciback: failed to get pcifront device\n");
565 return PCI_ERS_RESULT_NONE;
566 }
567 wmb();
568
569 dev_dbg(&psdev->dev->dev,
570 "pciback: aer_op %x dom %x bus %x devfn %x\n",
571 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
572 /*local flag to mark there's aer request, pciback callback will use this
573 * flag to judge whether we need to check pci-front give aer service
574 * ack signal
575 */
576 set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
577
578 /*It is possible that a pcifront conf_read_write ops request invokes
579 * the callback which cause the spurious execution of wake_up.
580 * Yet it is harmless and better than a spinlock here
581 */
582 set_bit(_XEN_PCIB_active,
583 (unsigned long *)&psdev->pdev->sh_info->flags);
584 wmb();
585 notify_remote_via_irq(psdev->pdev->evtchn_irq);
586
587 ret = wait_event_timeout(aer_wait_queue, !(test_bit(_XEN_PCIB_active,
588 (unsigned long *)&psdev->pdev->sh_info->flags)), 300*HZ);
589
590 if (!ret) {
591 if (test_bit(_XEN_PCIB_active,
592 (unsigned long *)&psdev->pdev->sh_info->flags)) {
593 dev_err(&psdev->dev->dev,
594 "pcifront aer process not responding!\n");
595 clear_bit(_XEN_PCIB_active,
596 (unsigned long *)&psdev->pdev->sh_info->flags);
597 aer_op->err = PCI_ERS_RESULT_NONE;
598 return res;
599 }
600 }
601 clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
602
603 if (test_bit(_XEN_PCIF_active,
604 (unsigned long *)&psdev->pdev->sh_info->flags)) {
605 dev_dbg(&psdev->dev->dev,
606 "schedule pci_conf service in pciback\n");
607 test_and_schedule_op(psdev->pdev);
608 }
609
610 res = (pci_ers_result_t)aer_op->err;
611 return res;
612 }
613
614 /*
615 * pciback_slot_reset: it will send the slot_reset request to pcifront in case
616 * of the device driver could provide this service, and then wait for pcifront
617 * ack.
618 * @dev: pointer to PCI devices
619 * return value is used by aer_core do_recovery policy
620 */
621 static pci_ers_result_t pciback_slot_reset(struct pci_dev *dev)
622 {
623 struct pcistub_device *psdev;
624 pci_ers_result_t result;
625
626 result = PCI_ERS_RESULT_RECOVERED;
627 dev_dbg(&dev->dev, "pciback_slot_reset(bus:%x,devfn:%x)\n",
628 dev->bus->number, dev->devfn);
629
630 down_write(&pcistub_sem);
631 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
632 dev->bus->number,
633 PCI_SLOT(dev->devfn),
634 PCI_FUNC(dev->devfn));
635
636 if (!psdev || !psdev->pdev) {
637 dev_err(&dev->dev,
638 "pciback device is not found/assigned\n");
639 goto end;
640 }
641
642 if (!psdev->pdev->sh_info) {
643 dev_err(&dev->dev, "pciback device is not connected or owned"
644 " by HVM, kill it\n");
645 kill_domain_by_device(psdev);
646 goto release;
647 }
648
649 if (!test_bit(_XEN_PCIB_AERHANDLER,
650 (unsigned long *)&psdev->pdev->sh_info->flags)) {
651 dev_err(&dev->dev,
652 "guest with no AER driver should have been killed\n");
653 goto release;
654 }
655 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
656
657 if (result == PCI_ERS_RESULT_NONE ||
658 result == PCI_ERS_RESULT_DISCONNECT) {
659 dev_dbg(&dev->dev,
660 "No AER slot_reset service or disconnected!\n");
661 kill_domain_by_device(psdev);
662 }
663 release:
664 pcistub_device_put(psdev);
665 end:
666 up_write(&pcistub_sem);
667 return result;
668
669 }
670
671
672 /*pciback_mmio_enabled: it will send the mmio_enabled request to pcifront
673 * in case of the device driver could provide this service, and then wait
674 * for pcifront ack
675 * @dev: pointer to PCI devices
676 * return value is used by aer_core do_recovery policy
677 */
678
679 static pci_ers_result_t pciback_mmio_enabled(struct pci_dev *dev)
680 {
681 struct pcistub_device *psdev;
682 pci_ers_result_t result;
683
684 result = PCI_ERS_RESULT_RECOVERED;
685 dev_dbg(&dev->dev, "pciback_mmio_enabled(bus:%x,devfn:%x)\n",
686 dev->bus->number, dev->devfn);
687
688 down_write(&pcistub_sem);
689 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
690 dev->bus->number,
691 PCI_SLOT(dev->devfn),
692 PCI_FUNC(dev->devfn));
693
694 if (!psdev || !psdev->pdev) {
695 dev_err(&dev->dev,
696 "pciback device is not found/assigned\n");
697 goto end;
698 }
699
700 if (!psdev->pdev->sh_info) {
701 dev_err(&dev->dev, "pciback device is not connected or owned"
702 " by HVM, kill it\n");
703 kill_domain_by_device(psdev);
704 goto release;
705 }
706
707 if (!test_bit(_XEN_PCIB_AERHANDLER,
708 (unsigned long *)&psdev->pdev->sh_info->flags)) {
709 dev_err(&dev->dev,
710 "guest with no AER driver should have been killed\n");
711 goto release;
712 }
713 result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
714
715 if (result == PCI_ERS_RESULT_NONE ||
716 result == PCI_ERS_RESULT_DISCONNECT) {
717 dev_dbg(&dev->dev,
718 "No AER mmio_enabled service or disconnected!\n");
719 kill_domain_by_device(psdev);
720 }
721 release:
722 pcistub_device_put(psdev);
723 end:
724 up_write(&pcistub_sem);
725 return result;
726 }
727
728 /*pciback_error_detected: it will send the error_detected request to pcifront
729 * in case of the device driver could provide this service, and then wait
730 * for pcifront ack.
731 * @dev: pointer to PCI devices
732 * @error: the current PCI connection state
733 * return value is used by aer_core do_recovery policy
734 */
735
736 static pci_ers_result_t pciback_error_detected(struct pci_dev *dev,
737 pci_channel_state_t error)
738 {
739 struct pcistub_device *psdev;
740 pci_ers_result_t result;
741
742 result = PCI_ERS_RESULT_CAN_RECOVER;
743 dev_dbg(&dev->dev, "pciback_error_detected(bus:%x,devfn:%x)\n",
744 dev->bus->number, dev->devfn);
745
746 down_write(&pcistub_sem);
747 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
748 dev->bus->number,
749 PCI_SLOT(dev->devfn),
750 PCI_FUNC(dev->devfn));
751
752 if (!psdev || !psdev->pdev) {
753 dev_err(&dev->dev,
754 "pciback device is not found/assigned\n");
755 goto end;
756 }
757
758 if (!psdev->pdev->sh_info) {
759 dev_err(&dev->dev, "pciback device is not connected or owned"
760 " by HVM, kill it\n");
761 kill_domain_by_device(psdev);
762 goto release;
763 }
764
765 /*Guest owns the device yet no aer handler regiested, kill guest*/
766 if (!test_bit(_XEN_PCIB_AERHANDLER,
767 (unsigned long *)&psdev->pdev->sh_info->flags)) {
768 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
769 kill_domain_by_device(psdev);
770 goto release;
771 }
772 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
773
774 if (result == PCI_ERS_RESULT_NONE ||
775 result == PCI_ERS_RESULT_DISCONNECT) {
776 dev_dbg(&dev->dev,
777 "No AER error_detected service or disconnected!\n");
778 kill_domain_by_device(psdev);
779 }
780 release:
781 pcistub_device_put(psdev);
782 end:
783 up_write(&pcistub_sem);
784 return result;
785 }
786
787 /*pciback_error_resume: it will send the error_resume request to pcifront
788 * in case of the device driver could provide this service, and then wait
789 * for pcifront ack.
790 * @dev: pointer to PCI devices
791 */
792
793 static void pciback_error_resume(struct pci_dev *dev)
794 {
795 struct pcistub_device *psdev;
796
797 dev_dbg(&dev->dev, "pciback_error_resume(bus:%x,devfn:%x)\n",
798 dev->bus->number, dev->devfn);
799
800 down_write(&pcistub_sem);
801 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
802 dev->bus->number,
803 PCI_SLOT(dev->devfn),
804 PCI_FUNC(dev->devfn));
805
806 if (!psdev || !psdev->pdev) {
807 dev_err(&dev->dev,
808 "pciback device is not found/assigned\n");
809 goto end;
810 }
811
812 if (!psdev->pdev->sh_info) {
813 dev_err(&dev->dev, "pciback device is not connected or owned"
814 " by HVM, kill it\n");
815 kill_domain_by_device(psdev);
816 goto release;
817 }
818
819 if (!test_bit(_XEN_PCIB_AERHANDLER,
820 (unsigned long *)&psdev->pdev->sh_info->flags)) {
821 dev_err(&dev->dev,
822 "guest with no AER driver should have been killed\n");
823 kill_domain_by_device(psdev);
824 goto release;
825 }
826 common_process(psdev, 1, XEN_PCI_OP_aer_resume,
827 PCI_ERS_RESULT_RECOVERED);
828 release:
829 pcistub_device_put(psdev);
830 end:
831 up_write(&pcistub_sem);
832 return;
833 }
834
835 /*add pciback AER handling*/
836 static struct pci_error_handlers pciback_error_handler = {
837 .error_detected = pciback_error_detected,
838 .mmio_enabled = pciback_mmio_enabled,
839 .slot_reset = pciback_slot_reset,
840 .resume = pciback_error_resume,
841 };
842
843 /*
844 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
845 * for a normal device. I don't want it to be loaded automatically.
846 */
847
848 static struct pci_driver pciback_pci_driver = {
849 .name = DRV_NAME,
850 .id_table = pcistub_ids,
851 .probe = pcistub_probe,
852 .remove = pcistub_remove,
853 .err_handler = &pciback_error_handler,
854 };
855
856 static inline int str_to_slot(const char *buf, int *domain, int *bus,
857 int *slot, int *func)
858 {
859 int err;
860
861 err = sscanf(buf, " %x:%x:%x.%x", domain, bus, slot, func);
862 if (err == 4)
863 return 0;
864 else if (err < 0)
865 return -EINVAL;
866
867 /* try again without domain */
868 *domain = 0;
869 err = sscanf(buf, " %x:%x.%x", bus, slot, func);
870 if (err == 3)
871 return 0;
872
873 return -EINVAL;
874 }
875
876 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
877 *slot, int *func, int *reg, int *size, int *mask)
878 {
879 int err;
880
881 err =
882 sscanf(buf, " %04x:%02x:%02x.%1x-%08x:%1x:%08x", domain, bus, slot,
883 func, reg, size, mask);
884 if (err == 7)
885 return 0;
886 return -EINVAL;
887 }
888
889 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
890 {
891 struct pcistub_device_id *pci_dev_id;
892 unsigned long flags;
893
894 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
895 if (!pci_dev_id)
896 return -ENOMEM;
897
898 pci_dev_id->domain = domain;
899 pci_dev_id->bus = bus;
900 pci_dev_id->devfn = PCI_DEVFN(slot, func);
901
902 pr_debug("pciback: wants to seize %04x:%02x:%02x.%01x\n",
903 domain, bus, slot, func);
904
905 spin_lock_irqsave(&device_ids_lock, flags);
906 list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids);
907 spin_unlock_irqrestore(&device_ids_lock, flags);
908
909 return 0;
910 }
911
912 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
913 {
914 struct pcistub_device_id *pci_dev_id, *t;
915 int devfn = PCI_DEVFN(slot, func);
916 int err = -ENOENT;
917 unsigned long flags;
918
919 spin_lock_irqsave(&device_ids_lock, flags);
920 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
921 slot_list) {
922 if (pci_dev_id->domain == domain
923 && pci_dev_id->bus == bus && pci_dev_id->devfn == devfn) {
924 /* Don't break; here because it's possible the same
925 * slot could be in the list more than once
926 */
927 list_del(&pci_dev_id->slot_list);
928 kfree(pci_dev_id);
929
930 err = 0;
931
932 pr_debug("pciback: removed %04x:%02x:%02x.%01x from "
933 "seize list\n", domain, bus, slot, func);
934 }
935 }
936 spin_unlock_irqrestore(&device_ids_lock, flags);
937
938 return err;
939 }
940
941 static int pcistub_reg_add(int domain, int bus, int slot, int func, int reg,
942 int size, int mask)
943 {
944 int err = 0;
945 struct pcistub_device *psdev;
946 struct pci_dev *dev;
947 struct config_field *field;
948
949 psdev = pcistub_device_find(domain, bus, slot, func);
950 if (!psdev || !psdev->dev) {
951 err = -ENODEV;
952 goto out;
953 }
954 dev = psdev->dev;
955
956 field = kzalloc(sizeof(*field), GFP_ATOMIC);
957 if (!field) {
958 err = -ENOMEM;
959 goto out;
960 }
961
962 field->offset = reg;
963 field->size = size;
964 field->mask = mask;
965 field->init = NULL;
966 field->reset = NULL;
967 field->release = NULL;
968 field->clean = pciback_config_field_free;
969
970 err = pciback_config_quirks_add_field(dev, field);
971 if (err)
972 kfree(field);
973 out:
974 return err;
975 }
976
977 static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
978 size_t count)
979 {
980 int domain, bus, slot, func;
981 int err;
982
983 err = str_to_slot(buf, &domain, &bus, &slot, &func);
984 if (err)
985 goto out;
986
987 err = pcistub_device_id_add(domain, bus, slot, func);
988
989 out:
990 if (!err)
991 err = count;
992 return err;
993 }
994
995 DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
996
997 static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
998 size_t count)
999 {
1000 int domain, bus, slot, func;
1001 int err;
1002
1003 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1004 if (err)
1005 goto out;
1006
1007 err = pcistub_device_id_remove(domain, bus, slot, func);
1008
1009 out:
1010 if (!err)
1011 err = count;
1012 return err;
1013 }
1014
1015 DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
1016
1017 static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
1018 {
1019 struct pcistub_device_id *pci_dev_id;
1020 size_t count = 0;
1021 unsigned long flags;
1022
1023 spin_lock_irqsave(&device_ids_lock, flags);
1024 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1025 if (count >= PAGE_SIZE)
1026 break;
1027
1028 count += scnprintf(buf + count, PAGE_SIZE - count,
1029 "%04x:%02x:%02x.%01x\n",
1030 pci_dev_id->domain, pci_dev_id->bus,
1031 PCI_SLOT(pci_dev_id->devfn),
1032 PCI_FUNC(pci_dev_id->devfn));
1033 }
1034 spin_unlock_irqrestore(&device_ids_lock, flags);
1035
1036 return count;
1037 }
1038
1039 DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
1040
1041 static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
1042 {
1043 struct pcistub_device *psdev;
1044 struct pciback_dev_data *dev_data;
1045 size_t count = 0;
1046 unsigned long flags;
1047
1048 spin_lock_irqsave(&pcistub_devices_lock, flags);
1049 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1050 if (count >= PAGE_SIZE)
1051 break;
1052 if (!psdev->dev)
1053 continue;
1054 dev_data = pci_get_drvdata(psdev->dev);
1055 if (!dev_data)
1056 continue;
1057 count +=
1058 scnprintf(buf + count, PAGE_SIZE - count,
1059 "%s:%s:%sing:%ld\n",
1060 pci_name(psdev->dev),
1061 dev_data->isr_on ? "on" : "off",
1062 dev_data->ack_intr ? "ack" : "not ack",
1063 dev_data->handled);
1064 }
1065 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1066 return count;
1067 }
1068
1069 DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
1070
1071 static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
1072 const char *buf,
1073 size_t count)
1074 {
1075 struct pcistub_device *psdev;
1076 struct pciback_dev_data *dev_data;
1077 int domain, bus, slot, func;
1078 int err = -ENOENT;
1079
1080 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1081 if (err)
1082 goto out;
1083
1084 psdev = pcistub_device_find(domain, bus, slot, func);
1085
1086 if (!psdev)
1087 goto out;
1088
1089 dev_data = pci_get_drvdata(psdev->dev);
1090 if (!dev_data)
1091 goto out;
1092
1093 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
1094 dev_data->irq_name, dev_data->isr_on,
1095 !dev_data->isr_on);
1096
1097 dev_data->isr_on = !(dev_data->isr_on);
1098 if (dev_data->isr_on)
1099 dev_data->ack_intr = 1;
1100 out:
1101 if (!err)
1102 err = count;
1103 return err;
1104 }
1105 DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL, pcistub_irq_handler_switch);
1106
1107 static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
1108 size_t count)
1109 {
1110 int domain, bus, slot, func, reg, size, mask;
1111 int err;
1112
1113 err = str_to_quirk(buf, &domain, &bus, &slot, &func, &reg, &size,
1114 &mask);
1115 if (err)
1116 goto out;
1117
1118 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1119
1120 out:
1121 if (!err)
1122 err = count;
1123 return err;
1124 }
1125
1126 static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
1127 {
1128 int count = 0;
1129 unsigned long flags;
1130 struct pciback_config_quirk *quirk;
1131 struct pciback_dev_data *dev_data;
1132 const struct config_field *field;
1133 const struct config_field_entry *cfg_entry;
1134
1135 spin_lock_irqsave(&device_ids_lock, flags);
1136 list_for_each_entry(quirk, &pciback_quirks, quirks_list) {
1137 if (count >= PAGE_SIZE)
1138 goto out;
1139
1140 count += scnprintf(buf + count, PAGE_SIZE - count,
1141 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1142 quirk->pdev->bus->number,
1143 PCI_SLOT(quirk->pdev->devfn),
1144 PCI_FUNC(quirk->pdev->devfn),
1145 quirk->devid.vendor, quirk->devid.device,
1146 quirk->devid.subvendor,
1147 quirk->devid.subdevice);
1148
1149 dev_data = pci_get_drvdata(quirk->pdev);
1150
1151 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1152 field = cfg_entry->field;
1153 if (count >= PAGE_SIZE)
1154 goto out;
1155
1156 count += scnprintf(buf + count, PAGE_SIZE - count,
1157 "\t\t%08x:%01x:%08x\n",
1158 cfg_entry->base_offset +
1159 field->offset, field->size,
1160 field->mask);
1161 }
1162 }
1163
1164 out:
1165 spin_unlock_irqrestore(&device_ids_lock, flags);
1166
1167 return count;
1168 }
1169
1170 DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show, pcistub_quirk_add);
1171
1172 static ssize_t permissive_add(struct device_driver *drv, const char *buf,
1173 size_t count)
1174 {
1175 int domain, bus, slot, func;
1176 int err;
1177 struct pcistub_device *psdev;
1178 struct pciback_dev_data *dev_data;
1179 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1180 if (err)
1181 goto out;
1182 psdev = pcistub_device_find(domain, bus, slot, func);
1183 if (!psdev) {
1184 err = -ENODEV;
1185 goto out;
1186 }
1187 if (!psdev->dev) {
1188 err = -ENODEV;
1189 goto release;
1190 }
1191 dev_data = pci_get_drvdata(psdev->dev);
1192 /* the driver data for a device should never be null at this point */
1193 if (!dev_data) {
1194 err = -ENXIO;
1195 goto release;
1196 }
1197 if (!dev_data->permissive) {
1198 dev_data->permissive = 1;
1199 /* Let user know that what they're doing could be unsafe */
1200 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1201 "configuration space accesses!\n");
1202 dev_warn(&psdev->dev->dev,
1203 "permissive mode is potentially unsafe!\n");
1204 }
1205 release:
1206 pcistub_device_put(psdev);
1207 out:
1208 if (!err)
1209 err = count;
1210 return err;
1211 }
1212
1213 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1214 {
1215 struct pcistub_device *psdev;
1216 struct pciback_dev_data *dev_data;
1217 size_t count = 0;
1218 unsigned long flags;
1219 spin_lock_irqsave(&pcistub_devices_lock, flags);
1220 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1221 if (count >= PAGE_SIZE)
1222 break;
1223 if (!psdev->dev)
1224 continue;
1225 dev_data = pci_get_drvdata(psdev->dev);
1226 if (!dev_data || !dev_data->permissive)
1227 continue;
1228 count +=
1229 scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1230 pci_name(psdev->dev));
1231 }
1232 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1233 return count;
1234 }
1235
1236 DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, permissive_add);
1237
1238 static void pcistub_exit(void)
1239 {
1240 driver_remove_file(&pciback_pci_driver.driver, &driver_attr_new_slot);
1241 driver_remove_file(&pciback_pci_driver.driver,
1242 &driver_attr_remove_slot);
1243 driver_remove_file(&pciback_pci_driver.driver, &driver_attr_slots);
1244 driver_remove_file(&pciback_pci_driver.driver, &driver_attr_quirks);
1245 driver_remove_file(&pciback_pci_driver.driver, &driver_attr_permissive);
1246 driver_remove_file(&pciback_pci_driver.driver,
1247 &driver_attr_irq_handlers);
1248 driver_remove_file(&pciback_pci_driver.driver,
1249 &driver_attr_irq_handler_state);
1250 pci_unregister_driver(&pciback_pci_driver);
1251 }
1252
1253 static int __init pcistub_init(void)
1254 {
1255 int pos = 0;
1256 int err = 0;
1257 int domain, bus, slot, func;
1258 int parsed;
1259
1260 if (pci_devs_to_hide && *pci_devs_to_hide) {
1261 do {
1262 parsed = 0;
1263
1264 err = sscanf(pci_devs_to_hide + pos,
1265 " (%x:%x:%x.%x) %n",
1266 &domain, &bus, &slot, &func, &parsed);
1267 if (err != 4) {
1268 domain = 0;
1269 err = sscanf(pci_devs_to_hide + pos,
1270 " (%x:%x.%x) %n",
1271 &bus, &slot, &func, &parsed);
1272 if (err != 3)
1273 goto parse_error;
1274 }
1275
1276 err = pcistub_device_id_add(domain, bus, slot, func);
1277 if (err)
1278 goto out;
1279
1280 /* if parsed<=0, we've reached the end of the string */
1281 pos += parsed;
1282 } while (parsed > 0 && pci_devs_to_hide[pos]);
1283 }
1284
1285 /* If we're the first PCI Device Driver to register, we're the
1286 * first one to get offered PCI devices as they become
1287 * available (and thus we can be the first to grab them)
1288 */
1289 err = pci_register_driver(&pciback_pci_driver);
1290 if (err < 0)
1291 goto out;
1292
1293 err = driver_create_file(&pciback_pci_driver.driver,
1294 &driver_attr_new_slot);
1295 if (!err)
1296 err = driver_create_file(&pciback_pci_driver.driver,
1297 &driver_attr_remove_slot);
1298 if (!err)
1299 err = driver_create_file(&pciback_pci_driver.driver,
1300 &driver_attr_slots);
1301 if (!err)
1302 err = driver_create_file(&pciback_pci_driver.driver,
1303 &driver_attr_quirks);
1304 if (!err)
1305 err = driver_create_file(&pciback_pci_driver.driver,
1306 &driver_attr_permissive);
1307
1308 if (!err)
1309 err = driver_create_file(&pciback_pci_driver.driver,
1310 &driver_attr_irq_handlers);
1311 if (!err)
1312 err = driver_create_file(&pciback_pci_driver.driver,
1313 &driver_attr_irq_handler_state);
1314 if (err)
1315 pcistub_exit();
1316
1317 out:
1318 return err;
1319
1320 parse_error:
1321 printk(KERN_ERR "pciback: Error parsing pci_devs_to_hide at \"%s\"\n",
1322 pci_devs_to_hide + pos);
1323 return -EINVAL;
1324 }
1325
1326 #ifndef MODULE
1327 /*
1328 * fs_initcall happens before device_initcall
1329 * so pciback *should* get called first (b/c we
1330 * want to suck up any device before other drivers
1331 * get a chance by being the first pci device
1332 * driver to register)
1333 */
1334 fs_initcall(pcistub_init);
1335 #endif
1336
1337 static int __init pciback_init(void)
1338 {
1339 int err;
1340
1341 if (!xen_initial_domain())
1342 return -ENODEV;
1343
1344 err = pciback_config_init();
1345 if (err)
1346 return err;
1347
1348 #ifdef MODULE
1349 err = pcistub_init();
1350 if (err < 0)
1351 return err;
1352 #endif
1353
1354 pcistub_init_devices_late();
1355 err = pciback_xenbus_register();
1356 if (err)
1357 pcistub_exit();
1358
1359 return err;
1360 }
1361
1362 static void __exit pciback_cleanup(void)
1363 {
1364 pciback_xenbus_unregister();
1365 pcistub_exit();
1366 }
1367
1368 module_init(pciback_init);
1369 module_exit(pciback_cleanup);
1370
1371 MODULE_LICENSE("Dual BSD/GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree