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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / vfio / pci / vfio_pci_intrs.c
blob210357691dc0a06e65b522e5847321e62c43541c
1 /*
2 * VFIO PCI interrupt handling
3 *
4 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
5 * Author: Alex Williamson <alex.williamson@redhat.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Derived from original vfio:
12 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
13 * Author: Tom Lyon, pugs@cisco.com
14 */
15
16 #include <linux/device.h>
17 #include <linux/interrupt.h>
18 #include <linux/eventfd.h>
19 #include <linux/pci.h>
20 #include <linux/file.h>
21 #include <linux/poll.h>
22 #include <linux/vfio.h>
23 #include <linux/wait.h>
24 #include <linux/workqueue.h>
25 #include <linux/slab.h>
26
27 #include "vfio_pci_private.h"
28
29 /*
30 * IRQfd - generic
31 */
32 struct virqfd {
33 struct vfio_pci_device *vdev;
34 struct eventfd_ctx *eventfd;
35 int (*handler)(struct vfio_pci_device *, void *);
36 void (*thread)(struct vfio_pci_device *, void *);
37 void *data;
38 struct work_struct inject;
39 wait_queue_t wait;
40 poll_table pt;
41 struct work_struct shutdown;
42 struct virqfd **pvirqfd;
43 };
44
45 static struct workqueue_struct *vfio_irqfd_cleanup_wq;
46
47 int __init vfio_pci_virqfd_init(void)
48 {
49 vfio_irqfd_cleanup_wq =
50 create_singlethread_workqueue("vfio-irqfd-cleanup");
51 if (!vfio_irqfd_cleanup_wq)
52 return -ENOMEM;
53
54 return 0;
55 }
56
57 void vfio_pci_virqfd_exit(void)
58 {
59 destroy_workqueue(vfio_irqfd_cleanup_wq);
60 }
61
62 static void virqfd_deactivate(struct virqfd *virqfd)
63 {
64 queue_work(vfio_irqfd_cleanup_wq, &virqfd->shutdown);
65 }
66
67 static int virqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
68 {
69 struct virqfd *virqfd = container_of(wait, struct virqfd, wait);
70 unsigned long flags = (unsigned long)key;
71
72 if (flags & POLLIN) {
73 /* An event has been signaled, call function */
74 if ((!virqfd->handler ||
75 virqfd->handler(virqfd->vdev, virqfd->data)) &&
76 virqfd->thread)
77 schedule_work(&virqfd->inject);
78 }
79
80 if (flags & POLLHUP) {
81 unsigned long flags;
82 spin_lock_irqsave(&virqfd->vdev->irqlock, flags);
83
84 /*
85 * The eventfd is closing, if the virqfd has not yet been
86 * queued for release, as determined by testing whether the
87 * vdev pointer to it is still valid, queue it now. As
88 * with kvm irqfds, we know we won't race against the virqfd
89 * going away because we hold wqh->lock to get here.
90 */
91 if (*(virqfd->pvirqfd) == virqfd) {
92 *(virqfd->pvirqfd) = NULL;
93 virqfd_deactivate(virqfd);
94 }
95
96 spin_unlock_irqrestore(&virqfd->vdev->irqlock, flags);
97 }
98
99 return 0;
100 }
101
102 static void virqfd_ptable_queue_proc(struct file *file,
103 wait_queue_head_t *wqh, poll_table *pt)
104 {
105 struct virqfd *virqfd = container_of(pt, struct virqfd, pt);
106 add_wait_queue(wqh, &virqfd->wait);
107 }
108
109 static void virqfd_shutdown(struct work_struct *work)
110 {
111 struct virqfd *virqfd = container_of(work, struct virqfd, shutdown);
112 u64 cnt;
113
114 eventfd_ctx_remove_wait_queue(virqfd->eventfd, &virqfd->wait, &cnt);
115 flush_work(&virqfd->inject);
116 eventfd_ctx_put(virqfd->eventfd);
117
118 kfree(virqfd);
119 }
120
121 static void virqfd_inject(struct work_struct *work)
122 {
123 struct virqfd *virqfd = container_of(work, struct virqfd, inject);
124 if (virqfd->thread)
125 virqfd->thread(virqfd->vdev, virqfd->data);
126 }
127
128 static int virqfd_enable(struct vfio_pci_device *vdev,
129 int (*handler)(struct vfio_pci_device *, void *),
130 void (*thread)(struct vfio_pci_device *, void *),
131 void *data, struct virqfd **pvirqfd, int fd)
132 {
133 struct fd irqfd;
134 struct eventfd_ctx *ctx;
135 struct virqfd *virqfd;
136 int ret = 0;
137 unsigned int events;
138
139 virqfd = kzalloc(sizeof(*virqfd), GFP_KERNEL);
140 if (!virqfd)
141 return -ENOMEM;
142
143 virqfd->pvirqfd = pvirqfd;
144 virqfd->vdev = vdev;
145 virqfd->handler = handler;
146 virqfd->thread = thread;
147 virqfd->data = data;
148
149 INIT_WORK(&virqfd->shutdown, virqfd_shutdown);
150 INIT_WORK(&virqfd->inject, virqfd_inject);
151
152 irqfd = fdget(fd);
153 if (!irqfd.file) {
154 ret = -EBADF;
155 goto err_fd;
156 }
157
158 ctx = eventfd_ctx_fileget(irqfd.file);
159 if (IS_ERR(ctx)) {
160 ret = PTR_ERR(ctx);
161 goto err_ctx;
162 }
163
164 virqfd->eventfd = ctx;
165
166 /*
167 * virqfds can be released by closing the eventfd or directly
168 * through ioctl. These are both done through a workqueue, so
169 * we update the pointer to the virqfd under lock to avoid
170 * pushing multiple jobs to release the same virqfd.
171 */
172 spin_lock_irq(&vdev->irqlock);
173
174 if (*pvirqfd) {
175 spin_unlock_irq(&vdev->irqlock);
176 ret = -EBUSY;
177 goto err_busy;
178 }
179 *pvirqfd = virqfd;
180
181 spin_unlock_irq(&vdev->irqlock);
182
183 /*
184 * Install our own custom wake-up handling so we are notified via
185 * a callback whenever someone signals the underlying eventfd.
186 */
187 init_waitqueue_func_entry(&virqfd->wait, virqfd_wakeup);
188 init_poll_funcptr(&virqfd->pt, virqfd_ptable_queue_proc);
189
190 events = irqfd.file->f_op->poll(irqfd.file, &virqfd->pt);
191
192 /*
193 * Check if there was an event already pending on the eventfd
194 * before we registered and trigger it as if we didn't miss it.
195 */
196 if (events & POLLIN) {
197 if ((!handler || handler(vdev, data)) && thread)
198 schedule_work(&virqfd->inject);
199 }
200
201 /*
202 * Do not drop the file until the irqfd is fully initialized,
203 * otherwise we might race against the POLLHUP.
204 */
205 fdput(irqfd);
206
207 return 0;
208 err_busy:
209 eventfd_ctx_put(ctx);
210 err_ctx:
211 fdput(irqfd);
212 err_fd:
213 kfree(virqfd);
214
215 return ret;
216 }
217
218 static void virqfd_disable(struct vfio_pci_device *vdev,
219 struct virqfd **pvirqfd)
220 {
221 unsigned long flags;
222
223 spin_lock_irqsave(&vdev->irqlock, flags);
224
225 if (*pvirqfd) {
226 virqfd_deactivate(*pvirqfd);
227 *pvirqfd = NULL;
228 }
229
230 spin_unlock_irqrestore(&vdev->irqlock, flags);
231
232 /*
233 * Block until we know all outstanding shutdown jobs have completed.
234 * Even if we don't queue the job, flush the wq to be sure it's
235 * been released.
236 */
237 flush_workqueue(vfio_irqfd_cleanup_wq);
238 }
239
240 /*
241 * INTx
242 */
243 static void vfio_send_intx_eventfd(struct vfio_pci_device *vdev, void *unused)
244 {
245 if (likely(is_intx(vdev) && !vdev->virq_disabled))
246 eventfd_signal(vdev->ctx[0].trigger, 1);
247 }
248
249 void vfio_pci_intx_mask(struct vfio_pci_device *vdev)
250 {
251 struct pci_dev *pdev = vdev->pdev;
252 unsigned long flags;
253
254 spin_lock_irqsave(&vdev->irqlock, flags);
255
256 /*
257 * Masking can come from interrupt, ioctl, or config space
258 * via INTx disable. The latter means this can get called
259 * even when not using intx delivery. In this case, just
260 * try to have the physical bit follow the virtual bit.
261 */
262 if (unlikely(!is_intx(vdev))) {
263 if (vdev->pci_2_3)
264 pci_intx(pdev, 0);
265 } else if (!vdev->ctx[0].masked) {
266 /*
267 * Can't use check_and_mask here because we always want to
268 * mask, not just when something is pending.
269 */
270 if (vdev->pci_2_3)
271 pci_intx(pdev, 0);
272 else
273 disable_irq_nosync(pdev->irq);
274
275 vdev->ctx[0].masked = true;
276 }
277
278 spin_unlock_irqrestore(&vdev->irqlock, flags);
279 }
280
281 /*
282 * If this is triggered by an eventfd, we can't call eventfd_signal
283 * or else we'll deadlock on the eventfd wait queue. Return >0 when
284 * a signal is necessary, which can then be handled via a work queue
285 * or directly depending on the caller.
286 */
287 static int vfio_pci_intx_unmask_handler(struct vfio_pci_device *vdev,
288 void *unused)
289 {
290 struct pci_dev *pdev = vdev->pdev;
291 unsigned long flags;
292 int ret = 0;
293
294 spin_lock_irqsave(&vdev->irqlock, flags);
295
296 /*
297 * Unmasking comes from ioctl or config, so again, have the
298 * physical bit follow the virtual even when not using INTx.
299 */
300 if (unlikely(!is_intx(vdev))) {
301 if (vdev->pci_2_3)
302 pci_intx(pdev, 1);
303 } else if (vdev->ctx[0].masked && !vdev->virq_disabled) {
304 /*
305 * A pending interrupt here would immediately trigger,
306 * but we can avoid that overhead by just re-sending
307 * the interrupt to the user.
308 */
309 if (vdev->pci_2_3) {
310 if (!pci_check_and_unmask_intx(pdev))
311 ret = 1;
312 } else
313 enable_irq(pdev->irq);
314
315 vdev->ctx[0].masked = (ret > 0);
316 }
317
318 spin_unlock_irqrestore(&vdev->irqlock, flags);
319
320 return ret;
321 }
322
323 void vfio_pci_intx_unmask(struct vfio_pci_device *vdev)
324 {
325 if (vfio_pci_intx_unmask_handler(vdev, NULL) > 0)
326 vfio_send_intx_eventfd(vdev, NULL);
327 }
328
329 static irqreturn_t vfio_intx_handler(int irq, void *dev_id)
330 {
331 struct vfio_pci_device *vdev = dev_id;
332 unsigned long flags;
333 int ret = IRQ_NONE;
334
335 spin_lock_irqsave(&vdev->irqlock, flags);
336
337 if (!vdev->pci_2_3) {
338 disable_irq_nosync(vdev->pdev->irq);
339 vdev->ctx[0].masked = true;
340 ret = IRQ_HANDLED;
341 } else if (!vdev->ctx[0].masked && /* may be shared */
342 pci_check_and_mask_intx(vdev->pdev)) {
343 vdev->ctx[0].masked = true;
344 ret = IRQ_HANDLED;
345 }
346
347 spin_unlock_irqrestore(&vdev->irqlock, flags);
348
349 if (ret == IRQ_HANDLED)
350 vfio_send_intx_eventfd(vdev, NULL);
351
352 return ret;
353 }
354
355 static int vfio_intx_enable(struct vfio_pci_device *vdev)
356 {
357 if (!is_irq_none(vdev))
358 return -EINVAL;
359
360 if (!vdev->pdev->irq)
361 return -ENODEV;
362
363 vdev->ctx = kzalloc(sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
364 if (!vdev->ctx)
365 return -ENOMEM;
366
367 vdev->num_ctx = 1;
368
369 /*
370 * If the virtual interrupt is masked, restore it. Devices
371 * supporting DisINTx can be masked at the hardware level
372 * here, non-PCI-2.3 devices will have to wait until the
373 * interrupt is enabled.
374 */
375 vdev->ctx[0].masked = vdev->virq_disabled;
376 if (vdev->pci_2_3)
377 pci_intx(vdev->pdev, !vdev->ctx[0].masked);
378
379 vdev->irq_type = VFIO_PCI_INTX_IRQ_INDEX;
380
381 return 0;
382 }
383
384 static int vfio_intx_set_signal(struct vfio_pci_device *vdev, int fd)
385 {
386 struct pci_dev *pdev = vdev->pdev;
387 unsigned long irqflags = IRQF_SHARED;
388 struct eventfd_ctx *trigger;
389 unsigned long flags;
390 int ret;
391
392 if (vdev->ctx[0].trigger) {
393 free_irq(pdev->irq, vdev);
394 kfree(vdev->ctx[0].name);
395 eventfd_ctx_put(vdev->ctx[0].trigger);
396 vdev->ctx[0].trigger = NULL;
397 }
398
399 if (fd < 0) /* Disable only */
400 return 0;
401
402 vdev->ctx[0].name = kasprintf(GFP_KERNEL, "vfio-intx(%s)",
403 pci_name(pdev));
404 if (!vdev->ctx[0].name)
405 return -ENOMEM;
406
407 trigger = eventfd_ctx_fdget(fd);
408 if (IS_ERR(trigger)) {
409 kfree(vdev->ctx[0].name);
410 return PTR_ERR(trigger);
411 }
412
413 vdev->ctx[0].trigger = trigger;
414
415 if (!vdev->pci_2_3)
416 irqflags = 0;
417
418 ret = request_irq(pdev->irq, vfio_intx_handler,
419 irqflags, vdev->ctx[0].name, vdev);
420 if (ret) {
421 vdev->ctx[0].trigger = NULL;
422 kfree(vdev->ctx[0].name);
423 eventfd_ctx_put(trigger);
424 return ret;
425 }
426
427 /*
428 * INTx disable will stick across the new irq setup,
429 * disable_irq won't.
430 */
431 spin_lock_irqsave(&vdev->irqlock, flags);
432 if (!vdev->pci_2_3 && vdev->ctx[0].masked)
433 disable_irq_nosync(pdev->irq);
434 spin_unlock_irqrestore(&vdev->irqlock, flags);
435
436 return 0;
437 }
438
439 static void vfio_intx_disable(struct vfio_pci_device *vdev)
440 {
441 vfio_intx_set_signal(vdev, -1);
442 virqfd_disable(vdev, &vdev->ctx[0].unmask);
443 virqfd_disable(vdev, &vdev->ctx[0].mask);
444 vdev->irq_type = VFIO_PCI_NUM_IRQS;
445 vdev->num_ctx = 0;
446 kfree(vdev->ctx);
447 }
448
449 /*
450 * MSI/MSI-X
451 */
452 static irqreturn_t vfio_msihandler(int irq, void *arg)
453 {
454 struct eventfd_ctx *trigger = arg;
455
456 eventfd_signal(trigger, 1);
457 return IRQ_HANDLED;
458 }
459
460 static int vfio_msi_enable(struct vfio_pci_device *vdev, int nvec, bool msix)
461 {
462 struct pci_dev *pdev = vdev->pdev;
463 int ret;
464
465 if (!is_irq_none(vdev))
466 return -EINVAL;
467
468 vdev->ctx = kzalloc(nvec * sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
469 if (!vdev->ctx)
470 return -ENOMEM;
471
472 if (msix) {
473 int i;
474
475 vdev->msix = kzalloc(nvec * sizeof(struct msix_entry),
476 GFP_KERNEL);
477 if (!vdev->msix) {
478 kfree(vdev->ctx);
479 return -ENOMEM;
480 }
481
482 for (i = 0; i < nvec; i++)
483 vdev->msix[i].entry = i;
484
485 ret = pci_enable_msix(pdev, vdev->msix, nvec);
486 if (ret) {
487 kfree(vdev->msix);
488 kfree(vdev->ctx);
489 return ret;
490 }
491 } else {
492 ret = pci_enable_msi_block(pdev, nvec);
493 if (ret) {
494 kfree(vdev->ctx);
495 return ret;
496 }
497 }
498
499 vdev->num_ctx = nvec;
500 vdev->irq_type = msix ? VFIO_PCI_MSIX_IRQ_INDEX :
501 VFIO_PCI_MSI_IRQ_INDEX;
502
503 if (!msix) {
504 /*
505 * Compute the virtual hardware field for max msi vectors -
506 * it is the log base 2 of the number of vectors.
507 */
508 vdev->msi_qmax = fls(nvec * 2 - 1) - 1;
509 }
510
511 return 0;
512 }
513
514 static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
515 int vector, int fd, bool msix)
516 {
517 struct pci_dev *pdev = vdev->pdev;
518 int irq = msix ? vdev->msix[vector].vector : pdev->irq + vector;
519 char *name = msix ? "vfio-msix" : "vfio-msi";
520 struct eventfd_ctx *trigger;
521 int ret;
522
523 if (vector >= vdev->num_ctx)
524 return -EINVAL;
525
526 if (vdev->ctx[vector].trigger) {
527 free_irq(irq, vdev->ctx[vector].trigger);
528 kfree(vdev->ctx[vector].name);
529 eventfd_ctx_put(vdev->ctx[vector].trigger);
530 vdev->ctx[vector].trigger = NULL;
531 }
532
533 if (fd < 0)
534 return 0;
535
536 vdev->ctx[vector].name = kasprintf(GFP_KERNEL, "%s[%d](%s)",
537 name, vector, pci_name(pdev));
538 if (!vdev->ctx[vector].name)
539 return -ENOMEM;
540
541 trigger = eventfd_ctx_fdget(fd);
542 if (IS_ERR(trigger)) {
543 kfree(vdev->ctx[vector].name);
544 return PTR_ERR(trigger);
545 }
546
547 ret = request_irq(irq, vfio_msihandler, 0,
548 vdev->ctx[vector].name, trigger);
549 if (ret) {
550 kfree(vdev->ctx[vector].name);
551 eventfd_ctx_put(trigger);
552 return ret;
553 }
554
555 vdev->ctx[vector].trigger = trigger;
556
557 return 0;
558 }
559
560 static int vfio_msi_set_block(struct vfio_pci_device *vdev, unsigned start,
561 unsigned count, int32_t *fds, bool msix)
562 {
563 int i, j, ret = 0;
564
565 if (start + count > vdev->num_ctx)
566 return -EINVAL;
567
568 for (i = 0, j = start; i < count && !ret; i++, j++) {
569 int fd = fds ? fds[i] : -1;
570 ret = vfio_msi_set_vector_signal(vdev, j, fd, msix);
571 }
572
573 if (ret) {
574 for (--j; j >= start; j--)
575 vfio_msi_set_vector_signal(vdev, j, -1, msix);
576 }
577
578 return ret;
579 }
580
581 static void vfio_msi_disable(struct vfio_pci_device *vdev, bool msix)
582 {
583 struct pci_dev *pdev = vdev->pdev;
584 int i;
585
586 vfio_msi_set_block(vdev, 0, vdev->num_ctx, NULL, msix);
587
588 for (i = 0; i < vdev->num_ctx; i++) {
589 virqfd_disable(vdev, &vdev->ctx[i].unmask);
590 virqfd_disable(vdev, &vdev->ctx[i].mask);
591 }
592
593 if (msix) {
594 pci_disable_msix(vdev->pdev);
595 kfree(vdev->msix);
596 } else
597 pci_disable_msi(pdev);
598
599 vdev->irq_type = VFIO_PCI_NUM_IRQS;
600 vdev->num_ctx = 0;
601 kfree(vdev->ctx);
602 }
603
604 /*
605 * IOCTL support
606 */
607 static int vfio_pci_set_intx_unmask(struct vfio_pci_device *vdev,
608 unsigned index, unsigned start,
609 unsigned count, uint32_t flags, void *data)
610 {
611 if (!is_intx(vdev) || start != 0 || count != 1)
612 return -EINVAL;
613
614 if (flags & VFIO_IRQ_SET_DATA_NONE) {
615 vfio_pci_intx_unmask(vdev);
616 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
617 uint8_t unmask = *(uint8_t *)data;
618 if (unmask)
619 vfio_pci_intx_unmask(vdev);
620 } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
621 int32_t fd = *(int32_t *)data;
622 if (fd >= 0)
623 return virqfd_enable(vdev, vfio_pci_intx_unmask_handler,
624 vfio_send_intx_eventfd, NULL,
625 &vdev->ctx[0].unmask, fd);
626
627 virqfd_disable(vdev, &vdev->ctx[0].unmask);
628 }
629
630 return 0;
631 }
632
633 static int vfio_pci_set_intx_mask(struct vfio_pci_device *vdev,
634 unsigned index, unsigned start,
635 unsigned count, uint32_t flags, void *data)
636 {
637 if (!is_intx(vdev) || start != 0 || count != 1)
638 return -EINVAL;
639
640 if (flags & VFIO_IRQ_SET_DATA_NONE) {
641 vfio_pci_intx_mask(vdev);
642 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
643 uint8_t mask = *(uint8_t *)data;
644 if (mask)
645 vfio_pci_intx_mask(vdev);
646 } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
647 return -ENOTTY; /* XXX implement me */
648 }
649
650 return 0;
651 }
652
653 static int vfio_pci_set_intx_trigger(struct vfio_pci_device *vdev,
654 unsigned index, unsigned start,
655 unsigned count, uint32_t flags, void *data)
656 {
657 if (is_intx(vdev) && !count && (flags & VFIO_IRQ_SET_DATA_NONE)) {
658 vfio_intx_disable(vdev);
659 return 0;
660 }
661
662 if (!(is_intx(vdev) || is_irq_none(vdev)) || start != 0 || count != 1)
663 return -EINVAL;
664
665 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
666 int32_t fd = *(int32_t *)data;
667 int ret;
668
669 if (is_intx(vdev))
670 return vfio_intx_set_signal(vdev, fd);
671
672 ret = vfio_intx_enable(vdev);
673 if (ret)
674 return ret;
675
676 ret = vfio_intx_set_signal(vdev, fd);
677 if (ret)
678 vfio_intx_disable(vdev);
679
680 return ret;
681 }
682
683 if (!is_intx(vdev))
684 return -EINVAL;
685
686 if (flags & VFIO_IRQ_SET_DATA_NONE) {
687 vfio_send_intx_eventfd(vdev, NULL);
688 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
689 uint8_t trigger = *(uint8_t *)data;
690 if (trigger)
691 vfio_send_intx_eventfd(vdev, NULL);
692 }
693 return 0;
694 }
695
696 static int vfio_pci_set_msi_trigger(struct vfio_pci_device *vdev,
697 unsigned index, unsigned start,
698 unsigned count, uint32_t flags, void *data)
699 {
700 int i;
701 bool msix = (index == VFIO_PCI_MSIX_IRQ_INDEX) ? true : false;
702
703 if (irq_is(vdev, index) && !count && (flags & VFIO_IRQ_SET_DATA_NONE)) {
704 vfio_msi_disable(vdev, msix);
705 return 0;
706 }
707
708 if (!(irq_is(vdev, index) || is_irq_none(vdev)))
709 return -EINVAL;
710
711 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
712 int32_t *fds = data;
713 int ret;
714
715 if (vdev->irq_type == index)
716 return vfio_msi_set_block(vdev, start, count,
717 fds, msix);
718
719 ret = vfio_msi_enable(vdev, start + count, msix);
720 if (ret)
721 return ret;
722
723 ret = vfio_msi_set_block(vdev, start, count, fds, msix);
724 if (ret)
725 vfio_msi_disable(vdev, msix);
726
727 return ret;
728 }
729
730 if (!irq_is(vdev, index) || start + count > vdev->num_ctx)
731 return -EINVAL;
732
733 for (i = start; i < start + count; i++) {
734 if (!vdev->ctx[i].trigger)
735 continue;
736 if (flags & VFIO_IRQ_SET_DATA_NONE) {
737 eventfd_signal(vdev->ctx[i].trigger, 1);
738 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
739 uint8_t *bools = data;
740 if (bools[i - start])
741 eventfd_signal(vdev->ctx[i].trigger, 1);
742 }
743 }
744 return 0;
745 }
746
747 static int vfio_pci_set_err_trigger(struct vfio_pci_device *vdev,
748 unsigned index, unsigned start,
749 unsigned count, uint32_t flags, void *data)
750 {
751 int32_t fd = *(int32_t *)data;
752
753 if ((index != VFIO_PCI_ERR_IRQ_INDEX) ||
754 !(flags & VFIO_IRQ_SET_DATA_TYPE_MASK))
755 return -EINVAL;
756
757 /* DATA_NONE/DATA_BOOL enables loopback testing */
758 if (flags & VFIO_IRQ_SET_DATA_NONE) {
759 if (vdev->err_trigger)
760 eventfd_signal(vdev->err_trigger, 1);
761 return 0;
762 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
763 uint8_t trigger = *(uint8_t *)data;
764 if (trigger && vdev->err_trigger)
765 eventfd_signal(vdev->err_trigger, 1);
766 return 0;
767 }
768
769 /* Handle SET_DATA_EVENTFD */
770 if (fd == -1) {
771 if (vdev->err_trigger)
772 eventfd_ctx_put(vdev->err_trigger);
773 vdev->err_trigger = NULL;
774 return 0;
775 } else if (fd >= 0) {
776 struct eventfd_ctx *efdctx;
777 efdctx = eventfd_ctx_fdget(fd);
778 if (IS_ERR(efdctx))
779 return PTR_ERR(efdctx);
780 if (vdev->err_trigger)
781 eventfd_ctx_put(vdev->err_trigger);
782 vdev->err_trigger = efdctx;
783 return 0;
784 } else
785 return -EINVAL;
786 }
787 int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
788 unsigned index, unsigned start, unsigned count,
789 void *data)
790 {
791 int (*func)(struct vfio_pci_device *vdev, unsigned index,
792 unsigned start, unsigned count, uint32_t flags,
793 void *data) = NULL;
794
795 switch (index) {
796 case VFIO_PCI_INTX_IRQ_INDEX:
797 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
798 case VFIO_IRQ_SET_ACTION_MASK:
799 func = vfio_pci_set_intx_mask;
800 break;
801 case VFIO_IRQ_SET_ACTION_UNMASK:
802 func = vfio_pci_set_intx_unmask;
803 break;
804 case VFIO_IRQ_SET_ACTION_TRIGGER:
805 func = vfio_pci_set_intx_trigger;
806 break;
807 }
808 break;
809 case VFIO_PCI_MSI_IRQ_INDEX:
810 case VFIO_PCI_MSIX_IRQ_INDEX:
811 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
812 case VFIO_IRQ_SET_ACTION_MASK:
813 case VFIO_IRQ_SET_ACTION_UNMASK:
814 /* XXX Need masking support exported */
815 break;
816 case VFIO_IRQ_SET_ACTION_TRIGGER:
817 func = vfio_pci_set_msi_trigger;
818 break;
819 }
820 break;
821 case VFIO_PCI_ERR_IRQ_INDEX:
822 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
823 case VFIO_IRQ_SET_ACTION_TRIGGER:
824 if (pci_is_pcie(vdev->pdev))
825 func = vfio_pci_set_err_trigger;
826 break;
827 }
828 }
829
830 if (!func)
831 return -ENOTTY;
832
833 return func(vdev, index, start, count, flags, data);
834 }
Linux with added FPC-III support