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16#include <linux/device.h>
17#include <linux/interrupt.h>
18#include <linux/eventfd.h>
19#include <linux/msi.h>
20#include <linux/pci.h>
21#include <linux/file.h>
22#include <linux/vfio.h>
23#include <linux/wait.h>
24#include <linux/slab.h>
25
26#include "vfio_pci_private.h"
27
28
29
30
31static void vfio_send_intx_eventfd(void *opaque, void *unused)
32{
33 struct vfio_pci_device *vdev = opaque;
34
35 if (likely(is_intx(vdev) && !vdev->virq_disabled))
36 eventfd_signal(vdev->ctx[0].trigger, 1);
37}
38
39void vfio_pci_intx_mask(struct vfio_pci_device *vdev)
40{
41 struct pci_dev *pdev = vdev->pdev;
42 unsigned long flags;
43
44 spin_lock_irqsave(&vdev->irqlock, flags);
45
46
47
48
49
50
51
52 if (unlikely(!is_intx(vdev))) {
53 if (vdev->pci_2_3)
54 pci_intx(pdev, 0);
55 } else if (!vdev->ctx[0].masked) {
56
57
58
59
60 if (vdev->pci_2_3)
61 pci_intx(pdev, 0);
62 else
63 disable_irq_nosync(pdev->irq);
64
65 vdev->ctx[0].masked = true;
66 }
67
68 spin_unlock_irqrestore(&vdev->irqlock, flags);
69}
70
71
72
73
74
75
76
77static int vfio_pci_intx_unmask_handler(void *opaque, void *unused)
78{
79 struct vfio_pci_device *vdev = opaque;
80 struct pci_dev *pdev = vdev->pdev;
81 unsigned long flags;
82 int ret = 0;
83
84 spin_lock_irqsave(&vdev->irqlock, flags);
85
86
87
88
89
90 if (unlikely(!is_intx(vdev))) {
91 if (vdev->pci_2_3)
92 pci_intx(pdev, 1);
93 } else if (vdev->ctx[0].masked && !vdev->virq_disabled) {
94
95
96
97
98
99 if (vdev->pci_2_3) {
100 if (!pci_check_and_unmask_intx(pdev))
101 ret = 1;
102 } else
103 enable_irq(pdev->irq);
104
105 vdev->ctx[0].masked = (ret > 0);
106 }
107
108 spin_unlock_irqrestore(&vdev->irqlock, flags);
109
110 return ret;
111}
112
113void vfio_pci_intx_unmask(struct vfio_pci_device *vdev)
114{
115 if (vfio_pci_intx_unmask_handler(vdev, NULL) > 0)
116 vfio_send_intx_eventfd(vdev, NULL);
117}
118
119static irqreturn_t vfio_intx_handler(int irq, void *dev_id)
120{
121 struct vfio_pci_device *vdev = dev_id;
122 unsigned long flags;
123 int ret = IRQ_NONE;
124
125 spin_lock_irqsave(&vdev->irqlock, flags);
126
127 if (!vdev->pci_2_3) {
128 disable_irq_nosync(vdev->pdev->irq);
129 vdev->ctx[0].masked = true;
130 ret = IRQ_HANDLED;
131 } else if (!vdev->ctx[0].masked &&
132 pci_check_and_mask_intx(vdev->pdev)) {
133 vdev->ctx[0].masked = true;
134 ret = IRQ_HANDLED;
135 }
136
137 spin_unlock_irqrestore(&vdev->irqlock, flags);
138
139 if (ret == IRQ_HANDLED)
140 vfio_send_intx_eventfd(vdev, NULL);
141
142 return ret;
143}
144
145static int vfio_intx_enable(struct vfio_pci_device *vdev)
146{
147 if (!is_irq_none(vdev))
148 return -EINVAL;
149
150 if (!vdev->pdev->irq)
151 return -ENODEV;
152
153 vdev->ctx = kzalloc(sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
154 if (!vdev->ctx)
155 return -ENOMEM;
156
157 vdev->num_ctx = 1;
158
159
160
161
162
163
164
165 vdev->ctx[0].masked = vdev->virq_disabled;
166 if (vdev->pci_2_3)
167 pci_intx(vdev->pdev, !vdev->ctx[0].masked);
168
169 vdev->irq_type = VFIO_PCI_INTX_IRQ_INDEX;
170
171 return 0;
172}
173
174static int vfio_intx_set_signal(struct vfio_pci_device *vdev, int fd)
175{
176 struct pci_dev *pdev = vdev->pdev;
177 unsigned long irqflags = IRQF_SHARED;
178 struct eventfd_ctx *trigger;
179 unsigned long flags;
180 int ret;
181
182 if (vdev->ctx[0].trigger) {
183 free_irq(pdev->irq, vdev);
184 kfree(vdev->ctx[0].name);
185 eventfd_ctx_put(vdev->ctx[0].trigger);
186 vdev->ctx[0].trigger = NULL;
187 }
188
189 if (fd < 0)
190 return 0;
191
192 vdev->ctx[0].name = kasprintf(GFP_KERNEL, "vfio-intx(%s)",
193 pci_name(pdev));
194 if (!vdev->ctx[0].name)
195 return -ENOMEM;
196
197 trigger = eventfd_ctx_fdget(fd);
198 if (IS_ERR(trigger)) {
199 kfree(vdev->ctx[0].name);
200 return PTR_ERR(trigger);
201 }
202
203 vdev->ctx[0].trigger = trigger;
204
205 if (!vdev->pci_2_3)
206 irqflags = 0;
207
208 ret = request_irq(pdev->irq, vfio_intx_handler,
209 irqflags, vdev->ctx[0].name, vdev);
210 if (ret) {
211 vdev->ctx[0].trigger = NULL;
212 kfree(vdev->ctx[0].name);
213 eventfd_ctx_put(trigger);
214 return ret;
215 }
216
217
218
219
220
221 spin_lock_irqsave(&vdev->irqlock, flags);
222 if (!vdev->pci_2_3 && vdev->ctx[0].masked)
223 disable_irq_nosync(pdev->irq);
224 spin_unlock_irqrestore(&vdev->irqlock, flags);
225
226 return 0;
227}
228
229static void vfio_intx_disable(struct vfio_pci_device *vdev)
230{
231 vfio_intx_set_signal(vdev, -1);
232 vfio_virqfd_disable(&vdev->ctx[0].unmask);
233 vfio_virqfd_disable(&vdev->ctx[0].mask);
234 vdev->irq_type = VFIO_PCI_NUM_IRQS;
235 vdev->num_ctx = 0;
236 kfree(vdev->ctx);
237}
238
239
240
241
242static irqreturn_t vfio_msihandler(int irq, void *arg)
243{
244 struct eventfd_ctx *trigger = arg;
245
246 eventfd_signal(trigger, 1);
247 return IRQ_HANDLED;
248}
249
250static int vfio_msi_enable(struct vfio_pci_device *vdev, int nvec, bool msix)
251{
252 struct pci_dev *pdev = vdev->pdev;
253 int ret;
254
255 if (!is_irq_none(vdev))
256 return -EINVAL;
257
258 vdev->ctx = kzalloc(nvec * sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
259 if (!vdev->ctx)
260 return -ENOMEM;
261
262 if (msix) {
263 int i;
264
265 vdev->msix = kzalloc(nvec * sizeof(struct msix_entry),
266 GFP_KERNEL);
267 if (!vdev->msix) {
268 kfree(vdev->ctx);
269 return -ENOMEM;
270 }
271
272 for (i = 0; i < nvec; i++)
273 vdev->msix[i].entry = i;
274
275 ret = pci_enable_msix_range(pdev, vdev->msix, 1, nvec);
276 if (ret < nvec) {
277 if (ret > 0)
278 pci_disable_msix(pdev);
279 kfree(vdev->msix);
280 kfree(vdev->ctx);
281 return ret;
282 }
283 } else {
284 ret = pci_enable_msi_range(pdev, 1, nvec);
285 if (ret < nvec) {
286 if (ret > 0)
287 pci_disable_msi(pdev);
288 kfree(vdev->ctx);
289 return ret;
290 }
291 }
292
293 vdev->num_ctx = nvec;
294 vdev->irq_type = msix ? VFIO_PCI_MSIX_IRQ_INDEX :
295 VFIO_PCI_MSI_IRQ_INDEX;
296
297 if (!msix) {
298
299
300
301
302 vdev->msi_qmax = fls(nvec * 2 - 1) - 1;
303 }
304
305 return 0;
306}
307
308static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
309 int vector, int fd, bool msix)
310{
311 struct pci_dev *pdev = vdev->pdev;
312 int irq = msix ? vdev->msix[vector].vector : pdev->irq + vector;
313 char *name = msix ? "vfio-msix" : "vfio-msi";
314 struct eventfd_ctx *trigger;
315 int ret;
316
317 if (vector >= vdev->num_ctx)
318 return -EINVAL;
319
320 if (vdev->ctx[vector].trigger) {
321 free_irq(irq, vdev->ctx[vector].trigger);
322 kfree(vdev->ctx[vector].name);
323 eventfd_ctx_put(vdev->ctx[vector].trigger);
324 vdev->ctx[vector].trigger = NULL;
325 }
326
327 if (fd < 0)
328 return 0;
329
330 vdev->ctx[vector].name = kasprintf(GFP_KERNEL, "%s[%d](%s)",
331 name, vector, pci_name(pdev));
332 if (!vdev->ctx[vector].name)
333 return -ENOMEM;
334
335 trigger = eventfd_ctx_fdget(fd);
336 if (IS_ERR(trigger)) {
337 kfree(vdev->ctx[vector].name);
338 return PTR_ERR(trigger);
339 }
340
341
342
343
344
345
346
347
348 if (msix) {
349 struct msi_msg msg;
350
351 get_cached_msi_msg(irq, &msg);
352 pci_write_msi_msg(irq, &msg);
353 }
354
355 ret = request_irq(irq, vfio_msihandler, 0,
356 vdev->ctx[vector].name, trigger);
357 if (ret) {
358 kfree(vdev->ctx[vector].name);
359 eventfd_ctx_put(trigger);
360 return ret;
361 }
362
363 vdev->ctx[vector].trigger = trigger;
364
365 return 0;
366}
367
368static int vfio_msi_set_block(struct vfio_pci_device *vdev, unsigned start,
369 unsigned count, int32_t *fds, bool msix)
370{
371 int i, j, ret = 0;
372
373 if (start + count > vdev->num_ctx)
374 return -EINVAL;
375
376 for (i = 0, j = start; i < count && !ret; i++, j++) {
377 int fd = fds ? fds[i] : -1;
378 ret = vfio_msi_set_vector_signal(vdev, j, fd, msix);
379 }
380
381 if (ret) {
382 for (--j; j >= start; j--)
383 vfio_msi_set_vector_signal(vdev, j, -1, msix);
384 }
385
386 return ret;
387}
388
389static void vfio_msi_disable(struct vfio_pci_device *vdev, bool msix)
390{
391 struct pci_dev *pdev = vdev->pdev;
392 int i;
393
394 vfio_msi_set_block(vdev, 0, vdev->num_ctx, NULL, msix);
395
396 for (i = 0; i < vdev->num_ctx; i++) {
397 vfio_virqfd_disable(&vdev->ctx[i].unmask);
398 vfio_virqfd_disable(&vdev->ctx[i].mask);
399 }
400
401 if (msix) {
402 pci_disable_msix(vdev->pdev);
403 kfree(vdev->msix);
404 } else
405 pci_disable_msi(pdev);
406
407 vdev->irq_type = VFIO_PCI_NUM_IRQS;
408 vdev->num_ctx = 0;
409 kfree(vdev->ctx);
410}
411
412
413
414
415static int vfio_pci_set_intx_unmask(struct vfio_pci_device *vdev,
416 unsigned index, unsigned start,
417 unsigned count, uint32_t flags, void *data)
418{
419 if (!is_intx(vdev) || start != 0 || count != 1)
420 return -EINVAL;
421
422 if (flags & VFIO_IRQ_SET_DATA_NONE) {
423 vfio_pci_intx_unmask(vdev);
424 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
425 uint8_t unmask = *(uint8_t *)data;
426 if (unmask)
427 vfio_pci_intx_unmask(vdev);
428 } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
429 int32_t fd = *(int32_t *)data;
430 if (fd >= 0)
431 return vfio_virqfd_enable((void *) vdev,
432 vfio_pci_intx_unmask_handler,
433 vfio_send_intx_eventfd, NULL,
434 &vdev->ctx[0].unmask, fd);
435
436 vfio_virqfd_disable(&vdev->ctx[0].unmask);
437 }
438
439 return 0;
440}
441
442static int vfio_pci_set_intx_mask(struct vfio_pci_device *vdev,
443 unsigned index, unsigned start,
444 unsigned count, uint32_t flags, void *data)
445{
446 if (!is_intx(vdev) || start != 0 || count != 1)
447 return -EINVAL;
448
449 if (flags & VFIO_IRQ_SET_DATA_NONE) {
450 vfio_pci_intx_mask(vdev);
451 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
452 uint8_t mask = *(uint8_t *)data;
453 if (mask)
454 vfio_pci_intx_mask(vdev);
455 } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
456 return -ENOTTY;
457 }
458
459 return 0;
460}
461
462static int vfio_pci_set_intx_trigger(struct vfio_pci_device *vdev,
463 unsigned index, unsigned start,
464 unsigned count, uint32_t flags, void *data)
465{
466 if (is_intx(vdev) && !count && (flags & VFIO_IRQ_SET_DATA_NONE)) {
467 vfio_intx_disable(vdev);
468 return 0;
469 }
470
471 if (!(is_intx(vdev) || is_irq_none(vdev)) || start != 0 || count != 1)
472 return -EINVAL;
473
474 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
475 int32_t fd = *(int32_t *)data;
476 int ret;
477
478 if (is_intx(vdev))
479 return vfio_intx_set_signal(vdev, fd);
480
481 ret = vfio_intx_enable(vdev);
482 if (ret)
483 return ret;
484
485 ret = vfio_intx_set_signal(vdev, fd);
486 if (ret)
487 vfio_intx_disable(vdev);
488
489 return ret;
490 }
491
492 if (!is_intx(vdev))
493 return -EINVAL;
494
495 if (flags & VFIO_IRQ_SET_DATA_NONE) {
496 vfio_send_intx_eventfd(vdev, NULL);
497 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
498 uint8_t trigger = *(uint8_t *)data;
499 if (trigger)
500 vfio_send_intx_eventfd(vdev, NULL);
501 }
502 return 0;
503}
504
505static int vfio_pci_set_msi_trigger(struct vfio_pci_device *vdev,
506 unsigned index, unsigned start,
507 unsigned count, uint32_t flags, void *data)
508{
509 int i;
510 bool msix = (index == VFIO_PCI_MSIX_IRQ_INDEX) ? true : false;
511
512 if (irq_is(vdev, index) && !count && (flags & VFIO_IRQ_SET_DATA_NONE)) {
513 vfio_msi_disable(vdev, msix);
514 return 0;
515 }
516
517 if (!(irq_is(vdev, index) || is_irq_none(vdev)))
518 return -EINVAL;
519
520 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
521 int32_t *fds = data;
522 int ret;
523
524 if (vdev->irq_type == index)
525 return vfio_msi_set_block(vdev, start, count,
526 fds, msix);
527
528 ret = vfio_msi_enable(vdev, start + count, msix);
529 if (ret)
530 return ret;
531
532 ret = vfio_msi_set_block(vdev, start, count, fds, msix);
533 if (ret)
534 vfio_msi_disable(vdev, msix);
535
536 return ret;
537 }
538
539 if (!irq_is(vdev, index) || start + count > vdev->num_ctx)
540 return -EINVAL;
541
542 for (i = start; i < start + count; i++) {
543 if (!vdev->ctx[i].trigger)
544 continue;
545 if (flags & VFIO_IRQ_SET_DATA_NONE) {
546 eventfd_signal(vdev->ctx[i].trigger, 1);
547 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
548 uint8_t *bools = data;
549 if (bools[i - start])
550 eventfd_signal(vdev->ctx[i].trigger, 1);
551 }
552 }
553 return 0;
554}
555
556static int vfio_pci_set_ctx_trigger_single(struct eventfd_ctx **ctx,
557 uint32_t flags, void *data)
558{
559 int32_t fd = *(int32_t *)data;
560
561 if (!(flags & VFIO_IRQ_SET_DATA_TYPE_MASK))
562 return -EINVAL;
563
564
565 if (flags & VFIO_IRQ_SET_DATA_NONE) {
566 if (*ctx)
567 eventfd_signal(*ctx, 1);
568 return 0;
569 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
570 uint8_t trigger = *(uint8_t *)data;
571 if (trigger && *ctx)
572 eventfd_signal(*ctx, 1);
573 return 0;
574 }
575
576
577 if (fd == -1) {
578 if (*ctx)
579 eventfd_ctx_put(*ctx);
580 *ctx = NULL;
581 return 0;
582 } else if (fd >= 0) {
583 struct eventfd_ctx *efdctx;
584 efdctx = eventfd_ctx_fdget(fd);
585 if (IS_ERR(efdctx))
586 return PTR_ERR(efdctx);
587 if (*ctx)
588 eventfd_ctx_put(*ctx);
589 *ctx = efdctx;
590 return 0;
591 } else
592 return -EINVAL;
593}
594
595static int vfio_pci_set_err_trigger(struct vfio_pci_device *vdev,
596 unsigned index, unsigned start,
597 unsigned count, uint32_t flags, void *data)
598{
599 if (index != VFIO_PCI_ERR_IRQ_INDEX)
600 return -EINVAL;
601
602
603
604
605
606
607 return vfio_pci_set_ctx_trigger_single(&vdev->err_trigger, flags, data);
608}
609
610static int vfio_pci_set_req_trigger(struct vfio_pci_device *vdev,
611 unsigned index, unsigned start,
612 unsigned count, uint32_t flags, void *data)
613{
614 if (index != VFIO_PCI_REQ_IRQ_INDEX || start != 0 || count != 1)
615 return -EINVAL;
616
617 return vfio_pci_set_ctx_trigger_single(&vdev->req_trigger, flags, data);
618}
619
620int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
621 unsigned index, unsigned start, unsigned count,
622 void *data)
623{
624 int (*func)(struct vfio_pci_device *vdev, unsigned index,
625 unsigned start, unsigned count, uint32_t flags,
626 void *data) = NULL;
627
628 switch (index) {
629 case VFIO_PCI_INTX_IRQ_INDEX:
630 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
631 case VFIO_IRQ_SET_ACTION_MASK:
632 func = vfio_pci_set_intx_mask;
633 break;
634 case VFIO_IRQ_SET_ACTION_UNMASK:
635 func = vfio_pci_set_intx_unmask;
636 break;
637 case VFIO_IRQ_SET_ACTION_TRIGGER:
638 func = vfio_pci_set_intx_trigger;
639 break;
640 }
641 break;
642 case VFIO_PCI_MSI_IRQ_INDEX:
643 case VFIO_PCI_MSIX_IRQ_INDEX:
644 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
645 case VFIO_IRQ_SET_ACTION_MASK:
646 case VFIO_IRQ_SET_ACTION_UNMASK:
647
648 break;
649 case VFIO_IRQ_SET_ACTION_TRIGGER:
650 func = vfio_pci_set_msi_trigger;
651 break;
652 }
653 break;
654 case VFIO_PCI_ERR_IRQ_INDEX:
655 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
656 case VFIO_IRQ_SET_ACTION_TRIGGER:
657 if (pci_is_pcie(vdev->pdev))
658 func = vfio_pci_set_err_trigger;
659 break;
660 }
661 break;
662 case VFIO_PCI_REQ_IRQ_INDEX:
663 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
664 case VFIO_IRQ_SET_ACTION_TRIGGER:
665 func = vfio_pci_set_req_trigger;
666 break;
667 }
668 break;
669 }
670
671 if (!func)
672 return -ENOTTY;
673
674 return func(vdev, index, start, count, flags, data);
675}
676