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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[deliverable/linux.git] / drivers / vfio / pci / vfio_pci_intrs.c
CommitLineData
89e1f7d4
AW		 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>
b8f02af0 19#include <linux/msi.h>
89e1f7d4
AW		 20#include <linux/pci.h>
21#include <linux/file.h>
22#include <linux/poll.h>
23#include <linux/vfio.h>
24#include <linux/wait.h>
25#include <linux/workqueue.h>
25e9789d 26#include <linux/slab.h>
89e1f7d4
AW		 27
28#include "vfio_pci_private.h"
29
30/*
31 * IRQfd - generic
32 */
33struct virqfd {
34 struct vfio_pci_device *vdev;
35 struct eventfd_ctx *eventfd;
36 int (*handler)(struct vfio_pci_device *, void *);
37 void (*thread)(struct vfio_pci_device *, void *);
38 void *data;
39 struct work_struct inject;
40 wait_queue_t wait;
41 poll_table pt;
42 struct work_struct shutdown;
43 struct virqfd **pvirqfd;
44};
45
46static struct workqueue_struct *vfio_irqfd_cleanup_wq;
47
48int __init vfio_pci_virqfd_init(void)
49{
50 vfio_irqfd_cleanup_wq =
51 create_singlethread_workqueue("vfio-irqfd-cleanup");
52 if (!vfio_irqfd_cleanup_wq)
53 return -ENOMEM;
54
55 return 0;
56}
57
58void vfio_pci_virqfd_exit(void)
59{
60 destroy_workqueue(vfio_irqfd_cleanup_wq);
61}
62
63static void virqfd_deactivate(struct virqfd *virqfd)
64{
65 queue_work(vfio_irqfd_cleanup_wq, &virqfd->shutdown);
66}
67
68static int virqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
69{
70 struct virqfd *virqfd = container_of(wait, struct virqfd, wait);
71 unsigned long flags = (unsigned long)key;
72
73 if (flags & POLLIN) {
74 /* An event has been signaled, call function */
75 if ((!virqfd->handler ||
76 virqfd->handler(virqfd->vdev, virqfd->data)) &&
77 virqfd->thread)
78 schedule_work(&virqfd->inject);
79 }
80
b68e7fa8
AW		 81 if (flags & POLLHUP) {
82 unsigned long flags;
83 spin_lock_irqsave(&virqfd->vdev->irqlock, flags);
84
85 /*
86 * The eventfd is closing, if the virqfd has not yet been
87 * queued for release, as determined by testing whether the
88 * vdev pointer to it is still valid, queue it now. As
89 * with kvm irqfds, we know we won't race against the virqfd
90 * going away because we hold wqh->lock to get here.
91 */
92 if (*(virqfd->pvirqfd) == virqfd) {
93 *(virqfd->pvirqfd) = NULL;
94 virqfd_deactivate(virqfd);
95 }
96
97 spin_unlock_irqrestore(&virqfd->vdev->irqlock, flags);
98 }
89e1f7d4
AW		 99
100 return 0;
101}
102
103static void virqfd_ptable_queue_proc(struct file *file,
104 wait_queue_head_t *wqh, poll_table *pt)
105{
106 struct virqfd *virqfd = container_of(pt, struct virqfd, pt);
107 add_wait_queue(wqh, &virqfd->wait);
108}
109
110static void virqfd_shutdown(struct work_struct *work)
111{
112 struct virqfd *virqfd = container_of(work, struct virqfd, shutdown);
89e1f7d4
AW		 113 u64 cnt;
114
115 eventfd_ctx_remove_wait_queue(virqfd->eventfd, &virqfd->wait, &cnt);
116 flush_work(&virqfd->inject);
117 eventfd_ctx_put(virqfd->eventfd);
118
119 kfree(virqfd);
89e1f7d4
AW		 120}
121
122static void virqfd_inject(struct work_struct *work)
123{
124 struct virqfd *virqfd = container_of(work, struct virqfd, inject);
125 if (virqfd->thread)
126 virqfd->thread(virqfd->vdev, virqfd->data);
127}
128
129static int virqfd_enable(struct vfio_pci_device *vdev,
130 int (*handler)(struct vfio_pci_device *, void *),
131 void (*thread)(struct vfio_pci_device *, void *),
132 void *data, struct virqfd **pvirqfd, int fd)
133{
20e77457
AW		 134 struct fd irqfd;
135 struct eventfd_ctx *ctx;
89e1f7d4
AW		 136 struct virqfd *virqfd;
137 int ret = 0;
138 unsigned int events;
139
89e1f7d4
AW		 140 virqfd = kzalloc(sizeof(*virqfd), GFP_KERNEL);
141 if (!virqfd)
142 return -ENOMEM;
143
144 virqfd->pvirqfd = pvirqfd;
89e1f7d4
AW		 145 virqfd->vdev = vdev;
146 virqfd->handler = handler;
147 virqfd->thread = thread;
148 virqfd->data = data;
149
150 INIT_WORK(&virqfd->shutdown, virqfd_shutdown);
151 INIT_WORK(&virqfd->inject, virqfd_inject);
152
20e77457
AW		 153 irqfd = fdget(fd);
154 if (!irqfd.file) {
155 ret = -EBADF;
156 goto err_fd;
89e1f7d4
AW		 157 }
158
20e77457 159 ctx = eventfd_ctx_fileget(irqfd.file);
89e1f7d4
AW		 160 if (IS_ERR(ctx)) {
161 ret = PTR_ERR(ctx);
20e77457 162 goto err_ctx;
89e1f7d4
AW		 163 }
164
165 virqfd->eventfd = ctx;
166
b68e7fa8
AW		 167 /*
168 * virqfds can be released by closing the eventfd or directly
169 * through ioctl. These are both done through a workqueue, so
170 * we update the pointer to the virqfd under lock to avoid
171 * pushing multiple jobs to release the same virqfd.
172 */
173 spin_lock_irq(&vdev->irqlock);
174
175 if (*pvirqfd) {
176 spin_unlock_irq(&vdev->irqlock);
177 ret = -EBUSY;
20e77457 178 goto err_busy;
b68e7fa8
AW		 179 }
180 *pvirqfd = virqfd;
181
182 spin_unlock_irq(&vdev->irqlock);
183
89e1f7d4
AW		 184 /*
185 * Install our own custom wake-up handling so we are notified via
186 * a callback whenever someone signals the underlying eventfd.
187 */
188 init_waitqueue_func_entry(&virqfd->wait, virqfd_wakeup);
189 init_poll_funcptr(&virqfd->pt, virqfd_ptable_queue_proc);
190
20e77457 191 events = irqfd.file->f_op->poll(irqfd.file, &virqfd->pt);
89e1f7d4
AW		 192
193 /*
194 * Check if there was an event already pending on the eventfd
195 * before we registered and trigger it as if we didn't miss it.
196 */
197 if (events & POLLIN) {
198 if ((!handler || handler(vdev, data)) && thread)
199 schedule_work(&virqfd->inject);
200 }
201
202 /*
203 * Do not drop the file until the irqfd is fully initialized,
204 * otherwise we might race against the POLLHUP.
205 */
20e77457 206 fdput(irqfd);
89e1f7d4
AW		 207
208 return 0;
20e77457
AW		 209err_busy:
210 eventfd_ctx_put(ctx);
211err_ctx:
212 fdput(irqfd);
213err_fd:
89e1f7d4 214 kfree(virqfd);
89e1f7d4
AW		 215
216 return ret;
217}
218
b68e7fa8
AW		 219static void virqfd_disable(struct vfio_pci_device *vdev,
220 struct virqfd **pvirqfd)
89e1f7d4 221{
b68e7fa8
AW		 222 unsigned long flags;
223
224 spin_lock_irqsave(&vdev->irqlock, flags);
225
226 if (*pvirqfd) {
227 virqfd_deactivate(*pvirqfd);
228 *pvirqfd = NULL;
229 }
89e1f7d4 230
b68e7fa8 231 spin_unlock_irqrestore(&vdev->irqlock, flags);
89e1f7d4 232
b68e7fa8
AW		 233 /*
234 * Block until we know all outstanding shutdown jobs have completed.
235 * Even if we don't queue the job, flush the wq to be sure it's
236 * been released.
237 */
89e1f7d4
AW		 238 flush_workqueue(vfio_irqfd_cleanup_wq);
239}
240
241/*
242 * INTx
243 */
244static void vfio_send_intx_eventfd(struct vfio_pci_device *vdev, void *unused)
245{
246 if (likely(is_intx(vdev) && !vdev->virq_disabled))
247 eventfd_signal(vdev->ctx[0].trigger, 1);
248}
249
250void vfio_pci_intx_mask(struct vfio_pci_device *vdev)
251{
252 struct pci_dev *pdev = vdev->pdev;
253 unsigned long flags;
254
255 spin_lock_irqsave(&vdev->irqlock, flags);
256
257 /*
258 * Masking can come from interrupt, ioctl, or config space
259 * via INTx disable. The latter means this can get called
260 * even when not using intx delivery. In this case, just
261 * try to have the physical bit follow the virtual bit.
262 */
263 if (unlikely(!is_intx(vdev))) {
264 if (vdev->pci_2_3)
265 pci_intx(pdev, 0);
266 } else if (!vdev->ctx[0].masked) {
267 /*
268 * Can't use check_and_mask here because we always want to
269 * mask, not just when something is pending.
270 */
271 if (vdev->pci_2_3)
272 pci_intx(pdev, 0);
273 else
274 disable_irq_nosync(pdev->irq);
275
276 vdev->ctx[0].masked = true;
277 }
278
279 spin_unlock_irqrestore(&vdev->irqlock, flags);
280}
281
282/*
283 * If this is triggered by an eventfd, we can't call eventfd_signal
284 * or else we'll deadlock on the eventfd wait queue. Return >0 when
285 * a signal is necessary, which can then be handled via a work queue
286 * or directly depending on the caller.
287 */
0bced2f7
WY		 288static int vfio_pci_intx_unmask_handler(struct vfio_pci_device *vdev,
289 void *unused)
89e1f7d4
AW		 290{
291 struct pci_dev *pdev = vdev->pdev;
292 unsigned long flags;
293 int ret = 0;
294
295 spin_lock_irqsave(&vdev->irqlock, flags);
296
297 /*
298 * Unmasking comes from ioctl or config, so again, have the
299 * physical bit follow the virtual even when not using INTx.
300 */
301 if (unlikely(!is_intx(vdev))) {
302 if (vdev->pci_2_3)
303 pci_intx(pdev, 1);
304 } else if (vdev->ctx[0].masked && !vdev->virq_disabled) {
305 /*
306 * A pending interrupt here would immediately trigger,
307 * but we can avoid that overhead by just re-sending
308 * the interrupt to the user.
309 */
310 if (vdev->pci_2_3) {
311 if (!pci_check_and_unmask_intx(pdev))
312 ret = 1;
313 } else
314 enable_irq(pdev->irq);
315
316 vdev->ctx[0].masked = (ret > 0);
317 }
318
319 spin_unlock_irqrestore(&vdev->irqlock, flags);
320
321 return ret;
322}
323
324void vfio_pci_intx_unmask(struct vfio_pci_device *vdev)
325{
326 if (vfio_pci_intx_unmask_handler(vdev, NULL) > 0)
327 vfio_send_intx_eventfd(vdev, NULL);
328}
329
330static irqreturn_t vfio_intx_handler(int irq, void *dev_id)
331{
332 struct vfio_pci_device *vdev = dev_id;
333 unsigned long flags;
334 int ret = IRQ_NONE;
335
336 spin_lock_irqsave(&vdev->irqlock, flags);
337
338 if (!vdev->pci_2_3) {
339 disable_irq_nosync(vdev->pdev->irq);
340 vdev->ctx[0].masked = true;
341 ret = IRQ_HANDLED;
342 } else if (!vdev->ctx[0].masked && /* may be shared */
343 pci_check_and_mask_intx(vdev->pdev)) {
344 vdev->ctx[0].masked = true;
345 ret = IRQ_HANDLED;
346 }
347
348 spin_unlock_irqrestore(&vdev->irqlock, flags);
349
350 if (ret == IRQ_HANDLED)
351 vfio_send_intx_eventfd(vdev, NULL);
352
353 return ret;
354}
355
356static int vfio_intx_enable(struct vfio_pci_device *vdev)
357{
358 if (!is_irq_none(vdev))
359 return -EINVAL;
360
361 if (!vdev->pdev->irq)
362 return -ENODEV;
363
364 vdev->ctx = kzalloc(sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
365 if (!vdev->ctx)
366 return -ENOMEM;
367
368 vdev->num_ctx = 1;
899649b7
AW		 369
370 /*
371 * If the virtual interrupt is masked, restore it. Devices
372 * supporting DisINTx can be masked at the hardware level
373 * here, non-PCI-2.3 devices will have to wait until the
374 * interrupt is enabled.
375 */
376 vdev->ctx[0].masked = vdev->virq_disabled;
377 if (vdev->pci_2_3)
378 pci_intx(vdev->pdev, !vdev->ctx[0].masked);
379
89e1f7d4
AW		 380 vdev->irq_type = VFIO_PCI_INTX_IRQ_INDEX;
381
382 return 0;
383}
384
385static int vfio_intx_set_signal(struct vfio_pci_device *vdev, int fd)
386{
387 struct pci_dev *pdev = vdev->pdev;
388 unsigned long irqflags = IRQF_SHARED;
389 struct eventfd_ctx *trigger;
390 unsigned long flags;
391 int ret;
392
393 if (vdev->ctx[0].trigger) {
394 free_irq(pdev->irq, vdev);
395 kfree(vdev->ctx[0].name);
396 eventfd_ctx_put(vdev->ctx[0].trigger);
397 vdev->ctx[0].trigger = NULL;
398 }
399
400 if (fd < 0) /* Disable only */
401 return 0;
402
403 vdev->ctx[0].name = kasprintf(GFP_KERNEL, "vfio-intx(%s)",
404 pci_name(pdev));
405 if (!vdev->ctx[0].name)
406 return -ENOMEM;
407
408 trigger = eventfd_ctx_fdget(fd);
409 if (IS_ERR(trigger)) {
410 kfree(vdev->ctx[0].name);
411 return PTR_ERR(trigger);
412 }
413
9dbdfd23
AW		 414 vdev->ctx[0].trigger = trigger;
415
89e1f7d4
AW		 416 if (!vdev->pci_2_3)
417 irqflags = 0;
418
419 ret = request_irq(pdev->irq, vfio_intx_handler,
420 irqflags, vdev->ctx[0].name, vdev);
421 if (ret) {
9dbdfd23 422 vdev->ctx[0].trigger = NULL;
89e1f7d4
AW		 423 kfree(vdev->ctx[0].name);
424 eventfd_ctx_put(trigger);
425 return ret;
426 }
427
89e1f7d4
AW		 428 /*
429 * INTx disable will stick across the new irq setup,
430 * disable_irq won't.
431 */
432 spin_lock_irqsave(&vdev->irqlock, flags);
899649b7 433 if (!vdev->pci_2_3 && vdev->ctx[0].masked)
89e1f7d4
AW		 434 disable_irq_nosync(pdev->irq);
435 spin_unlock_irqrestore(&vdev->irqlock, flags);
436
437 return 0;
438}
439
440static void vfio_intx_disable(struct vfio_pci_device *vdev)
441{
442 vfio_intx_set_signal(vdev, -1);
b68e7fa8
AW		 443 virqfd_disable(vdev, &vdev->ctx[0].unmask);
444 virqfd_disable(vdev, &vdev->ctx[0].mask);
89e1f7d4
AW		 445 vdev->irq_type = VFIO_PCI_NUM_IRQS;
446 vdev->num_ctx = 0;
447 kfree(vdev->ctx);
448}
449
450/*
451 * MSI/MSI-X
452 */
453static irqreturn_t vfio_msihandler(int irq, void *arg)
454{
455 struct eventfd_ctx *trigger = arg;
456
457 eventfd_signal(trigger, 1);
458 return IRQ_HANDLED;
459}
460
461static int vfio_msi_enable(struct vfio_pci_device *vdev, int nvec, bool msix)
462{
463 struct pci_dev *pdev = vdev->pdev;
464 int ret;
465
466 if (!is_irq_none(vdev))
467 return -EINVAL;
468
469 vdev->ctx = kzalloc(nvec * sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
470 if (!vdev->ctx)
471 return -ENOMEM;
472
473 if (msix) {
474 int i;
475
476 vdev->msix = kzalloc(nvec * sizeof(struct msix_entry),
477 GFP_KERNEL);
478 if (!vdev->msix) {
479 kfree(vdev->ctx);
480 return -ENOMEM;
481 }
482
483 for (i = 0; i < nvec; i++)
484 vdev->msix[i].entry = i;
485
94cccde6
AG		 486 ret = pci_enable_msix_range(pdev, vdev->msix, 1, nvec);
487 if (ret < nvec) {
488 if (ret > 0)
489 pci_disable_msix(pdev);
89e1f7d4
AW		 490 kfree(vdev->msix);
491 kfree(vdev->ctx);
492 return ret;
493 }
494 } else {
94cccde6
AG		 495 ret = pci_enable_msi_range(pdev, 1, nvec);
496 if (ret < nvec) {
497 if (ret > 0)
498 pci_disable_msi(pdev);
89e1f7d4
AW		 499 kfree(vdev->ctx);
500 return ret;
501 }
502 }
503
504 vdev->num_ctx = nvec;
505 vdev->irq_type = msix ? VFIO_PCI_MSIX_IRQ_INDEX :
506 VFIO_PCI_MSI_IRQ_INDEX;
507
508 if (!msix) {
509 /*
510 * Compute the virtual hardware field for max msi vectors -
511 * it is the log base 2 of the number of vectors.
512 */
513 vdev->msi_qmax = fls(nvec * 2 - 1) - 1;
514 }
515
516 return 0;
517}
518
519static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
520 int vector, int fd, bool msix)
521{
522 struct pci_dev *pdev = vdev->pdev;
523 int irq = msix ? vdev->msix[vector].vector : pdev->irq + vector;
524 char *name = msix ? "vfio-msix" : "vfio-msi";
525 struct eventfd_ctx *trigger;
526 int ret;
527
528 if (vector >= vdev->num_ctx)
529 return -EINVAL;
530
531 if (vdev->ctx[vector].trigger) {
532 free_irq(irq, vdev->ctx[vector].trigger);
533 kfree(vdev->ctx[vector].name);
534 eventfd_ctx_put(vdev->ctx[vector].trigger);
535 vdev->ctx[vector].trigger = NULL;
536 }
537
538 if (fd < 0)
539 return 0;
540
541 vdev->ctx[vector].name = kasprintf(GFP_KERNEL, "%s[%d](%s)",
542 name, vector, pci_name(pdev));
543 if (!vdev->ctx[vector].name)
544 return -ENOMEM;
545
546 trigger = eventfd_ctx_fdget(fd);
547 if (IS_ERR(trigger)) {
548 kfree(vdev->ctx[vector].name);
549 return PTR_ERR(trigger);
550 }
551
b8f02af0
GS		 552 /*
553 * The MSIx vector table resides in device memory which may be cleared
554 * via backdoor resets. We don't allow direct access to the vector
555 * table so even if a userspace driver attempts to save/restore around
556 * such a reset it would be unsuccessful. To avoid this, restore the
557 * cached value of the message prior to enabling.
558 */
559 if (msix) {
560 struct msi_msg msg;
561
562 get_cached_msi_msg(irq, &msg);
83a18912 563 pci_write_msi_msg(irq, &msg);
b8f02af0
GS		 564 }
565
89e1f7d4
AW		 566 ret = request_irq(irq, vfio_msihandler, 0,
567 vdev->ctx[vector].name, trigger);
568 if (ret) {
569 kfree(vdev->ctx[vector].name);
570 eventfd_ctx_put(trigger);
571 return ret;
572 }
573
574 vdev->ctx[vector].trigger = trigger;
575
576 return 0;
577}
578
579static int vfio_msi_set_block(struct vfio_pci_device *vdev, unsigned start,
580 unsigned count, int32_t *fds, bool msix)
581{
582 int i, j, ret = 0;
583
584 if (start + count > vdev->num_ctx)
585 return -EINVAL;
586
587 for (i = 0, j = start; i < count && !ret; i++, j++) {
588 int fd = fds ? fds[i] : -1;
589 ret = vfio_msi_set_vector_signal(vdev, j, fd, msix);
590 }
591
592 if (ret) {
593 for (--j; j >= start; j--)
594 vfio_msi_set_vector_signal(vdev, j, -1, msix);
595 }
596
597 return ret;
598}
599
600static void vfio_msi_disable(struct vfio_pci_device *vdev, bool msix)
601{
602 struct pci_dev *pdev = vdev->pdev;
603 int i;
604
605 vfio_msi_set_block(vdev, 0, vdev->num_ctx, NULL, msix);
606
607 for (i = 0; i < vdev->num_ctx; i++) {
b68e7fa8
AW		 608 virqfd_disable(vdev, &vdev->ctx[i].unmask);
609 virqfd_disable(vdev, &vdev->ctx[i].mask);
89e1f7d4
AW		 610 }
611
612 if (msix) {
613 pci_disable_msix(vdev->pdev);
614 kfree(vdev->msix);
615 } else
616 pci_disable_msi(pdev);
617
618 vdev->irq_type = VFIO_PCI_NUM_IRQS;
619 vdev->num_ctx = 0;
620 kfree(vdev->ctx);
621}
622
623/*
624 * IOCTL support
625 */
626static int vfio_pci_set_intx_unmask(struct vfio_pci_device *vdev,
627 unsigned index, unsigned start,
628 unsigned count, uint32_t flags, void *data)
629{
630 if (!is_intx(vdev) || start != 0 || count != 1)
631 return -EINVAL;
632
633 if (flags & VFIO_IRQ_SET_DATA_NONE) {
634 vfio_pci_intx_unmask(vdev);
635 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
636 uint8_t unmask = *(uint8_t *)data;
637 if (unmask)
638 vfio_pci_intx_unmask(vdev);
639 } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
640 int32_t fd = *(int32_t *)data;
641 if (fd >= 0)
642 return virqfd_enable(vdev, vfio_pci_intx_unmask_handler,
643 vfio_send_intx_eventfd, NULL,
644 &vdev->ctx[0].unmask, fd);
645
b68e7fa8 646 virqfd_disable(vdev, &vdev->ctx[0].unmask);
89e1f7d4
AW		 647 }
648
649 return 0;
650}
651
652static int vfio_pci_set_intx_mask(struct vfio_pci_device *vdev,
653 unsigned index, unsigned start,
654 unsigned count, uint32_t flags, void *data)
655{
656 if (!is_intx(vdev) || start != 0 || count != 1)
657 return -EINVAL;
658
659 if (flags & VFIO_IRQ_SET_DATA_NONE) {
660 vfio_pci_intx_mask(vdev);
661 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
662 uint8_t mask = *(uint8_t *)data;
663 if (mask)
664 vfio_pci_intx_mask(vdev);
665 } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
666 return -ENOTTY; /* XXX implement me */
667 }
668
669 return 0;
670}
671
672static int vfio_pci_set_intx_trigger(struct vfio_pci_device *vdev,
673 unsigned index, unsigned start,
674 unsigned count, uint32_t flags, void *data)
675{
676 if (is_intx(vdev) && !count && (flags & VFIO_IRQ_SET_DATA_NONE)) {
677 vfio_intx_disable(vdev);
678 return 0;
679 }
680
681 if (!(is_intx(vdev) || is_irq_none(vdev)) || start != 0 || count != 1)
682 return -EINVAL;
683
684 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
685 int32_t fd = *(int32_t *)data;
686 int ret;
687
688 if (is_intx(vdev))
689 return vfio_intx_set_signal(vdev, fd);
690
691 ret = vfio_intx_enable(vdev);
692 if (ret)
693 return ret;
694
695 ret = vfio_intx_set_signal(vdev, fd);
696 if (ret)
697 vfio_intx_disable(vdev);
698
699 return ret;
700 }
701
702 if (!is_intx(vdev))
703 return -EINVAL;
704
705 if (flags & VFIO_IRQ_SET_DATA_NONE) {
706 vfio_send_intx_eventfd(vdev, NULL);
707 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
708 uint8_t trigger = *(uint8_t *)data;
709 if (trigger)
710 vfio_send_intx_eventfd(vdev, NULL);
711 }
712 return 0;
713}
714
715static int vfio_pci_set_msi_trigger(struct vfio_pci_device *vdev,
716 unsigned index, unsigned start,
717 unsigned count, uint32_t flags, void *data)
718{
719 int i;
720 bool msix = (index == VFIO_PCI_MSIX_IRQ_INDEX) ? true : false;
721
722 if (irq_is(vdev, index) && !count && (flags & VFIO_IRQ_SET_DATA_NONE)) {
723 vfio_msi_disable(vdev, msix);
724 return 0;
725 }
726
727 if (!(irq_is(vdev, index) || is_irq_none(vdev)))
728 return -EINVAL;
729
730 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
731 int32_t *fds = data;
732 int ret;
733
734 if (vdev->irq_type == index)
735 return vfio_msi_set_block(vdev, start, count,
736 fds, msix);
737
738 ret = vfio_msi_enable(vdev, start + count, msix);
739 if (ret)
740 return ret;
741
742 ret = vfio_msi_set_block(vdev, start, count, fds, msix);
743 if (ret)
744 vfio_msi_disable(vdev, msix);
745
746 return ret;
747 }
748
749 if (!irq_is(vdev, index) || start + count > vdev->num_ctx)
750 return -EINVAL;
751
752 for (i = start; i < start + count; i++) {
753 if (!vdev->ctx[i].trigger)
754 continue;
755 if (flags & VFIO_IRQ_SET_DATA_NONE) {
756 eventfd_signal(vdev->ctx[i].trigger, 1);
757 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
758 uint8_t *bools = data;
759 if (bools[i - start])
760 eventfd_signal(vdev->ctx[i].trigger, 1);
761 }
762 }
763 return 0;
764}
765
cac80d6e
AW		 766static int vfio_pci_set_ctx_trigger_single(struct eventfd_ctx **ctx,
767 uint32_t flags, void *data)
dad9f897
VMP		 768{
769 int32_t fd = *(int32_t *)data;
dad9f897 770
cac80d6e 771 if (!(flags & VFIO_IRQ_SET_DATA_TYPE_MASK))
dad9f897
VMP		 772 return -EINVAL;
773
dad9f897 774 /* DATA_NONE/DATA_BOOL enables loopback testing */
dad9f897 775 if (flags & VFIO_IRQ_SET_DATA_NONE) {
cac80d6e
AW		 776 if (*ctx)
777 eventfd_signal(*ctx, 1);
dad9f897
VMP		 778 return 0;
779 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
780 uint8_t trigger = *(uint8_t *)data;
cac80d6e
AW		 781 if (trigger && *ctx)
782 eventfd_signal(*ctx, 1);
dad9f897
VMP		 783 return 0;
784 }
785
786 /* Handle SET_DATA_EVENTFD */
dad9f897 787 if (fd == -1) {
cac80d6e
AW		 788 if (*ctx)
789 eventfd_ctx_put(*ctx);
790 *ctx = NULL;
dad9f897
VMP		 791 return 0;
792 } else if (fd >= 0) {
793 struct eventfd_ctx *efdctx;
794 efdctx = eventfd_ctx_fdget(fd);
795 if (IS_ERR(efdctx))
796 return PTR_ERR(efdctx);
cac80d6e
AW		 797 if (*ctx)
798 eventfd_ctx_put(*ctx);
799 *ctx = efdctx;
dad9f897
VMP		 800 return 0;
801 } else
802 return -EINVAL;
803}
cac80d6e
AW		 804
805static int vfio_pci_set_err_trigger(struct vfio_pci_device *vdev,
806 unsigned index, unsigned start,
807 unsigned count, uint32_t flags, void *data)
808{
809 if (index != VFIO_PCI_ERR_IRQ_INDEX)
810 return -EINVAL;
811
812 /*
813 * We should sanitize start & count, but that wasn't caught
814 * originally, so this IRQ index must forever ignore them :-(
815 */
816
817 return vfio_pci_set_ctx_trigger_single(&vdev->err_trigger, flags, data);
818}
819
6140a8f5
AW		 820static int vfio_pci_set_req_trigger(struct vfio_pci_device *vdev,
821 unsigned index, unsigned start,
822 unsigned count, uint32_t flags, void *data)
823{
824 if (index != VFIO_PCI_REQ_IRQ_INDEX || start != 0 || count != 1)
825 return -EINVAL;
826
827 return vfio_pci_set_ctx_trigger_single(&vdev->req_trigger, flags, data);
828}
829
89e1f7d4
AW		 830int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
831 unsigned index, unsigned start, unsigned count,
832 void *data)
833{
834 int (*func)(struct vfio_pci_device *vdev, unsigned index,
835 unsigned start, unsigned count, uint32_t flags,
836 void *data) = NULL;
837
838 switch (index) {
839 case VFIO_PCI_INTX_IRQ_INDEX:
840 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
841 case VFIO_IRQ_SET_ACTION_MASK:
842 func = vfio_pci_set_intx_mask;
843 break;
844 case VFIO_IRQ_SET_ACTION_UNMASK:
845 func = vfio_pci_set_intx_unmask;
846 break;
847 case VFIO_IRQ_SET_ACTION_TRIGGER:
848 func = vfio_pci_set_intx_trigger;
849 break;
850 }
851 break;
852 case VFIO_PCI_MSI_IRQ_INDEX:
853 case VFIO_PCI_MSIX_IRQ_INDEX:
854 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
855 case VFIO_IRQ_SET_ACTION_MASK:
856 case VFIO_IRQ_SET_ACTION_UNMASK:
857 /* XXX Need masking support exported */
858 break;
859 case VFIO_IRQ_SET_ACTION_TRIGGER:
860 func = vfio_pci_set_msi_trigger;
861 break;
862 }
863 break;
dad9f897
VMP		 864 case VFIO_PCI_ERR_IRQ_INDEX:
865 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
866 case VFIO_IRQ_SET_ACTION_TRIGGER:
867 if (pci_is_pcie(vdev->pdev))
868 func = vfio_pci_set_err_trigger;
869 break;
870 }
ec76f400 871 break;
6140a8f5
AW		 872 case VFIO_PCI_REQ_IRQ_INDEX:
873 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
874 case VFIO_IRQ_SET_ACTION_TRIGGER:
875 func = vfio_pci_set_req_trigger;
876 break;
877 }
ec76f400 878 break;
89e1f7d4
AW		 879 }
880
881 if (!func)
882 return -ENOTTY;
883
884 return func(vdev, index, start, count, flags, data);
885}
Linux kernel - Deliverables
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