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14#include <linux/device.h>
15#include <linux/eventfd.h>
16#include <linux/file.h>
17#include <linux/interrupt.h>
18#include <linux/iommu.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/notifier.h>
22#include <linux/pci.h>
23#include <linux/pm_runtime.h>
24#include <linux/slab.h>
25#include <linux/types.h>
26#include <linux/uaccess.h>
27#include <linux/vfio.h>
28
29#include "vfio_pci_private.h"
30
31#define DRIVER_VERSION "0.2"
32#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
33#define DRIVER_DESC "VFIO PCI - User Level meta-driver"
34
35static bool nointxmask;
36module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
37MODULE_PARM_DESC(nointxmask,
38 "Disable support for PCI 2.3 style INTx masking. If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag.");
39
40static int vfio_pci_enable(struct vfio_pci_device *vdev)
41{
42 struct pci_dev *pdev = vdev->pdev;
43 int ret;
44 u16 cmd;
45 u8 msix_pos;
46
47 ret = pci_enable_device(pdev);
48 if (ret)
49 return ret;
50
51 vdev->reset_works = (pci_reset_function(pdev) == 0);
52 pci_save_state(pdev);
53 vdev->pci_saved_state = pci_store_saved_state(pdev);
54 if (!vdev->pci_saved_state)
55 pr_debug("%s: Couldn't store %s saved state\n",
56 __func__, dev_name(&pdev->dev));
57
58 ret = vfio_config_init(vdev);
59 if (ret) {
60 pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state);
61 pci_disable_device(pdev);
62 return ret;
63 }
64
65 if (likely(!nointxmask))
66 vdev->pci_2_3 = pci_intx_mask_supported(pdev);
67
68 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
69 if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
70 cmd &= ~PCI_COMMAND_INTX_DISABLE;
71 pci_write_config_word(pdev, PCI_COMMAND, cmd);
72 }
73
74 msix_pos = pdev->msix_cap;
75 if (msix_pos) {
76 u16 flags;
77 u32 table;
78
79 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
80 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
81
82 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
83 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
84 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
85 } else
86 vdev->msix_bar = 0xFF;
87
88#ifdef CONFIG_VFIO_PCI_VGA
89 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
90 vdev->has_vga = true;
91#endif
92
93 return 0;
94}
95
96static void vfio_pci_disable(struct vfio_pci_device *vdev)
97{
98 struct pci_dev *pdev = vdev->pdev;
99 int bar;
100
101 pci_disable_device(pdev);
102
103 vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
104 VFIO_IRQ_SET_ACTION_TRIGGER,
105 vdev->irq_type, 0, 0, NULL);
106
107 vdev->virq_disabled = false;
108
109 vfio_config_free(vdev);
110
111 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
112 if (!vdev->barmap[bar])
113 continue;
114 pci_iounmap(pdev, vdev->barmap[bar]);
115 pci_release_selected_regions(pdev, 1 << bar);
116 vdev->barmap[bar] = NULL;
117 }
118
119
120
121
122
123
124
125 if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
126 pr_info("%s: Couldn't reload %s saved state\n",
127 __func__, dev_name(&pdev->dev));
128
129 if (!vdev->reset_works)
130 return;
131
132 pci_save_state(pdev);
133 }
134
135
136
137
138
139 pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
140
141
142
143
144
145 if (vdev->reset_works) {
146 int ret = pci_try_reset_function(pdev);
147 if (ret)
148 pr_warn("%s: Failed to reset device %s (%d)\n",
149 __func__, dev_name(&pdev->dev), ret);
150 }
151
152 pci_restore_state(pdev);
153}
154
155static void vfio_pci_release(void *device_data)
156{
157 struct vfio_pci_device *vdev = device_data;
158
159 if (atomic_dec_and_test(&vdev->refcnt))
160 vfio_pci_disable(vdev);
161
162 module_put(THIS_MODULE);
163}
164
165static int vfio_pci_open(void *device_data)
166{
167 struct vfio_pci_device *vdev = device_data;
168
169 if (!try_module_get(THIS_MODULE))
170 return -ENODEV;
171
172 if (atomic_inc_return(&vdev->refcnt) == 1) {
173 int ret = vfio_pci_enable(vdev);
174 if (ret) {
175 module_put(THIS_MODULE);
176 return ret;
177 }
178 }
179
180 return 0;
181}
182
183static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
184{
185 if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
186 u8 pin;
187 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
188 if (pin)
189 return 1;
190
191 } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
192 u8 pos;
193 u16 flags;
194
195 pos = vdev->pdev->msi_cap;
196 if (pos) {
197 pci_read_config_word(vdev->pdev,
198 pos + PCI_MSI_FLAGS, &flags);
199
200 return 1 << (flags & PCI_MSI_FLAGS_QMASK);
201 }
202 } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
203 u8 pos;
204 u16 flags;
205
206 pos = vdev->pdev->msix_cap;
207 if (pos) {
208 pci_read_config_word(vdev->pdev,
209 pos + PCI_MSIX_FLAGS, &flags);
210
211 return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
212 }
213 } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX)
214 if (pci_is_pcie(vdev->pdev))
215 return 1;
216
217 return 0;
218}
219
220static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
221{
222 (*(int *)data)++;
223 return 0;
224}
225
226struct vfio_pci_fill_info {
227 int max;
228 int cur;
229 struct vfio_pci_dependent_device *devices;
230};
231
232static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
233{
234 struct vfio_pci_fill_info *fill = data;
235 struct iommu_group *iommu_group;
236
237 if (fill->cur == fill->max)
238 return -EAGAIN;
239
240 iommu_group = iommu_group_get(&pdev->dev);
241 if (!iommu_group)
242 return -EPERM;
243
244 fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
245 fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
246 fill->devices[fill->cur].bus = pdev->bus->number;
247 fill->devices[fill->cur].devfn = pdev->devfn;
248 fill->cur++;
249 iommu_group_put(iommu_group);
250 return 0;
251}
252
253struct vfio_pci_group_entry {
254 struct vfio_group *group;
255 int id;
256};
257
258struct vfio_pci_group_info {
259 int count;
260 struct vfio_pci_group_entry *groups;
261};
262
263static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
264{
265 struct vfio_pci_group_info *info = data;
266 struct iommu_group *group;
267 int id, i;
268
269 group = iommu_group_get(&pdev->dev);
270 if (!group)
271 return -EPERM;
272
273 id = iommu_group_id(group);
274
275 for (i = 0; i < info->count; i++)
276 if (info->groups[i].id == id)
277 break;
278
279 iommu_group_put(group);
280
281 return (i == info->count) ? -EINVAL : 0;
282}
283
284static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
285{
286 for (; pdev; pdev = pdev->bus->self)
287 if (pdev->bus == slot->bus)
288 return (pdev->slot == slot);
289 return false;
290}
291
292struct vfio_pci_walk_info {
293 int (*fn)(struct pci_dev *, void *data);
294 void *data;
295 struct pci_dev *pdev;
296 bool slot;
297 int ret;
298};
299
300static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
301{
302 struct vfio_pci_walk_info *walk = data;
303
304 if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
305 walk->ret = walk->fn(pdev, walk->data);
306
307 return walk->ret;
308}
309
310static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
311 int (*fn)(struct pci_dev *,
312 void *data), void *data,
313 bool slot)
314{
315 struct vfio_pci_walk_info walk = {
316 .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
317 };
318
319 pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
320
321 return walk.ret;
322}
323
324static long vfio_pci_ioctl(void *device_data,
325 unsigned int cmd, unsigned long arg)
326{
327 struct vfio_pci_device *vdev = device_data;
328 unsigned long minsz;
329
330 if (cmd == VFIO_DEVICE_GET_INFO) {
331 struct vfio_device_info info;
332
333 minsz = offsetofend(struct vfio_device_info, num_irqs);
334
335 if (copy_from_user(&info, (void __user *)arg, minsz))
336 return -EFAULT;
337
338 if (info.argsz < minsz)
339 return -EINVAL;
340
341 info.flags = VFIO_DEVICE_FLAGS_PCI;
342
343 if (vdev->reset_works)
344 info.flags |= VFIO_DEVICE_FLAGS_RESET;
345
346 info.num_regions = VFIO_PCI_NUM_REGIONS;
347 info.num_irqs = VFIO_PCI_NUM_IRQS;
348
349 return copy_to_user((void __user *)arg, &info, minsz);
350
351 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
352 struct pci_dev *pdev = vdev->pdev;
353 struct vfio_region_info info;
354
355 minsz = offsetofend(struct vfio_region_info, offset);
356
357 if (copy_from_user(&info, (void __user *)arg, minsz))
358 return -EFAULT;
359
360 if (info.argsz < minsz)
361 return -EINVAL;
362
363 switch (info.index) {
364 case VFIO_PCI_CONFIG_REGION_INDEX:
365 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
366 info.size = pdev->cfg_size;
367 info.flags = VFIO_REGION_INFO_FLAG_READ |
368 VFIO_REGION_INFO_FLAG_WRITE;
369 break;
370 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
371 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
372 info.size = pci_resource_len(pdev, info.index);
373 if (!info.size) {
374 info.flags = 0;
375 break;
376 }
377
378 info.flags = VFIO_REGION_INFO_FLAG_READ |
379 VFIO_REGION_INFO_FLAG_WRITE;
380 if (pci_resource_flags(pdev, info.index) &
381 IORESOURCE_MEM && info.size >= PAGE_SIZE)
382 info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
383 break;
384 case VFIO_PCI_ROM_REGION_INDEX:
385 {
386 void __iomem *io;
387 size_t size;
388
389 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
390 info.flags = 0;
391
392
393 info.size = pci_resource_len(pdev, info.index);
394 if (!info.size)
395 break;
396
397
398 io = pci_map_rom(pdev, &size);
399 if (!io || !size) {
400 info.size = 0;
401 break;
402 }
403 pci_unmap_rom(pdev, io);
404
405 info.flags = VFIO_REGION_INFO_FLAG_READ;
406 break;
407 }
408 case VFIO_PCI_VGA_REGION_INDEX:
409 if (!vdev->has_vga)
410 return -EINVAL;
411
412 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
413 info.size = 0xc0000;
414 info.flags = VFIO_REGION_INFO_FLAG_READ |
415 VFIO_REGION_INFO_FLAG_WRITE;
416
417 break;
418 default:
419 return -EINVAL;
420 }
421
422 return copy_to_user((void __user *)arg, &info, minsz);
423
424 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
425 struct vfio_irq_info info;
426
427 minsz = offsetofend(struct vfio_irq_info, count);
428
429 if (copy_from_user(&info, (void __user *)arg, minsz))
430 return -EFAULT;
431
432 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
433 return -EINVAL;
434
435 switch (info.index) {
436 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
437 break;
438 case VFIO_PCI_ERR_IRQ_INDEX:
439 if (pci_is_pcie(vdev->pdev))
440 break;
441
442 default:
443 return -EINVAL;
444 }
445
446 info.flags = VFIO_IRQ_INFO_EVENTFD;
447
448 info.count = vfio_pci_get_irq_count(vdev, info.index);
449
450 if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
451 info.flags |= (VFIO_IRQ_INFO_MASKABLE |
452 VFIO_IRQ_INFO_AUTOMASKED);
453 else
454 info.flags |= VFIO_IRQ_INFO_NORESIZE;
455
456 return copy_to_user((void __user *)arg, &info, minsz);
457
458 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
459 struct vfio_irq_set hdr;
460 u8 *data = NULL;
461 int ret = 0;
462
463 minsz = offsetofend(struct vfio_irq_set, count);
464
465 if (copy_from_user(&hdr, (void __user *)arg, minsz))
466 return -EFAULT;
467
468 if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS ||
469 hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
470 VFIO_IRQ_SET_ACTION_TYPE_MASK))
471 return -EINVAL;
472
473 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
474 size_t size;
475 int max = vfio_pci_get_irq_count(vdev, hdr.index);
476
477 if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
478 size = sizeof(uint8_t);
479 else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
480 size = sizeof(int32_t);
481 else
482 return -EINVAL;
483
484 if (hdr.argsz - minsz < hdr.count * size ||
485 hdr.start >= max || hdr.start + hdr.count > max)
486 return -EINVAL;
487
488 data = memdup_user((void __user *)(arg + minsz),
489 hdr.count * size);
490 if (IS_ERR(data))
491 return PTR_ERR(data);
492 }
493
494 mutex_lock(&vdev->igate);
495
496 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
497 hdr.start, hdr.count, data);
498
499 mutex_unlock(&vdev->igate);
500 kfree(data);
501
502 return ret;
503
504 } else if (cmd == VFIO_DEVICE_RESET) {
505 return vdev->reset_works ?
506 pci_try_reset_function(vdev->pdev) : -EINVAL;
507
508 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
509 struct vfio_pci_hot_reset_info hdr;
510 struct vfio_pci_fill_info fill = { 0 };
511 struct vfio_pci_dependent_device *devices = NULL;
512 bool slot = false;
513 int ret = 0;
514
515 minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
516
517 if (copy_from_user(&hdr, (void __user *)arg, minsz))
518 return -EFAULT;
519
520 if (hdr.argsz < minsz)
521 return -EINVAL;
522
523 hdr.flags = 0;
524
525
526 if (!pci_probe_reset_slot(vdev->pdev->slot))
527 slot = true;
528 else if (pci_probe_reset_bus(vdev->pdev->bus))
529 return -ENODEV;
530
531
532 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
533 vfio_pci_count_devs,
534 &fill.max, slot);
535 if (ret)
536 return ret;
537
538 WARN_ON(!fill.max);
539
540
541
542
543
544 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
545 ret = -ENOSPC;
546 hdr.count = fill.max;
547 goto reset_info_exit;
548 }
549
550 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
551 if (!devices)
552 return -ENOMEM;
553
554 fill.devices = devices;
555
556 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
557 vfio_pci_fill_devs,
558 &fill, slot);
559
560
561
562
563
564
565 if (!ret)
566 hdr.count = fill.cur;
567
568reset_info_exit:
569 if (copy_to_user((void __user *)arg, &hdr, minsz))
570 ret = -EFAULT;
571
572 if (!ret) {
573 if (copy_to_user((void __user *)(arg + minsz), devices,
574 hdr.count * sizeof(*devices)))
575 ret = -EFAULT;
576 }
577
578 kfree(devices);
579 return ret;
580
581 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
582 struct vfio_pci_hot_reset hdr;
583 int32_t *group_fds;
584 struct vfio_pci_group_entry *groups;
585 struct vfio_pci_group_info info;
586 bool slot = false;
587 int i, count = 0, ret = 0;
588
589 minsz = offsetofend(struct vfio_pci_hot_reset, count);
590
591 if (copy_from_user(&hdr, (void __user *)arg, minsz))
592 return -EFAULT;
593
594 if (hdr.argsz < minsz || hdr.flags)
595 return -EINVAL;
596
597
598 if (!pci_probe_reset_slot(vdev->pdev->slot))
599 slot = true;
600 else if (pci_probe_reset_bus(vdev->pdev->bus))
601 return -ENODEV;
602
603
604
605
606
607
608
609 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
610 vfio_pci_count_devs,
611 &count, slot);
612 if (ret)
613 return ret;
614
615
616 if (!hdr.count || hdr.count > count)
617 return -EINVAL;
618
619 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
620 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
621 if (!group_fds || !groups) {
622 kfree(group_fds);
623 kfree(groups);
624 return -ENOMEM;
625 }
626
627 if (copy_from_user(group_fds, (void __user *)(arg + minsz),
628 hdr.count * sizeof(*group_fds))) {
629 kfree(group_fds);
630 kfree(groups);
631 return -EFAULT;
632 }
633
634
635
636
637
638
639 for (i = 0; i < hdr.count; i++) {
640 struct vfio_group *group;
641 struct fd f = fdget(group_fds[i]);
642 if (!f.file) {
643 ret = -EBADF;
644 break;
645 }
646
647 group = vfio_group_get_external_user(f.file);
648 fdput(f);
649 if (IS_ERR(group)) {
650 ret = PTR_ERR(group);
651 break;
652 }
653
654 groups[i].group = group;
655 groups[i].id = vfio_external_user_iommu_id(group);
656 }
657
658 kfree(group_fds);
659
660
661 if (ret)
662 goto hot_reset_release;
663
664 info.count = hdr.count;
665 info.groups = groups;
666
667
668
669
670
671 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
672 vfio_pci_validate_devs,
673 &info, slot);
674 if (!ret)
675
676 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
677 pci_try_reset_bus(vdev->pdev->bus);
678
679hot_reset_release:
680 for (i--; i >= 0; i--)
681 vfio_group_put_external_user(groups[i].group);
682
683 kfree(groups);
684 return ret;
685 }
686
687 return -ENOTTY;
688}
689
690static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
691 size_t count, loff_t *ppos, bool iswrite)
692{
693 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
694 struct vfio_pci_device *vdev = device_data;
695
696 if (index >= VFIO_PCI_NUM_REGIONS)
697 return -EINVAL;
698
699 switch (index) {
700 case VFIO_PCI_CONFIG_REGION_INDEX:
701 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
702
703 case VFIO_PCI_ROM_REGION_INDEX:
704 if (iswrite)
705 return -EINVAL;
706 return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
707
708 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
709 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
710
711 case VFIO_PCI_VGA_REGION_INDEX:
712 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
713 }
714
715 return -EINVAL;
716}
717
718static ssize_t vfio_pci_read(void *device_data, char __user *buf,
719 size_t count, loff_t *ppos)
720{
721 if (!count)
722 return 0;
723
724 return vfio_pci_rw(device_data, buf, count, ppos, false);
725}
726
727static ssize_t vfio_pci_write(void *device_data, const char __user *buf,
728 size_t count, loff_t *ppos)
729{
730 if (!count)
731 return 0;
732
733 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
734}
735
736static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
737{
738 struct vfio_pci_device *vdev = device_data;
739 struct pci_dev *pdev = vdev->pdev;
740 unsigned int index;
741 u64 phys_len, req_len, pgoff, req_start;
742 int ret;
743
744 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
745
746 if (vma->vm_end < vma->vm_start)
747 return -EINVAL;
748 if ((vma->vm_flags & VM_SHARED) == 0)
749 return -EINVAL;
750 if (index >= VFIO_PCI_ROM_REGION_INDEX)
751 return -EINVAL;
752 if (!(pci_resource_flags(pdev, index) & IORESOURCE_MEM))
753 return -EINVAL;
754
755 phys_len = pci_resource_len(pdev, index);
756 req_len = vma->vm_end - vma->vm_start;
757 pgoff = vma->vm_pgoff &
758 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
759 req_start = pgoff << PAGE_SHIFT;
760
761 if (phys_len < PAGE_SIZE || req_start + req_len > phys_len)
762 return -EINVAL;
763
764 if (index == vdev->msix_bar) {
765
766
767
768
769
770
771
772
773
774
775 if (!(req_start >= vdev->msix_offset + vdev->msix_size ||
776 req_start + req_len <= vdev->msix_offset))
777 return -EINVAL;
778 }
779
780
781
782
783
784 if (!vdev->barmap[index]) {
785 ret = pci_request_selected_regions(pdev,
786 1 << index, "vfio-pci");
787 if (ret)
788 return ret;
789
790 vdev->barmap[index] = pci_iomap(pdev, index, 0);
791 }
792
793 vma->vm_private_data = vdev;
794 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
795 vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
796
797 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
798 req_len, vma->vm_page_prot);
799}
800
801static const struct vfio_device_ops vfio_pci_ops = {
802 .name = "vfio-pci",
803 .open = vfio_pci_open,
804 .release = vfio_pci_release,
805 .ioctl = vfio_pci_ioctl,
806 .read = vfio_pci_read,
807 .write = vfio_pci_write,
808 .mmap = vfio_pci_mmap,
809};
810
811static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
812{
813 u8 type;
814 struct vfio_pci_device *vdev;
815 struct iommu_group *group;
816 int ret;
817
818 pci_read_config_byte(pdev, PCI_HEADER_TYPE, &type);
819 if ((type & PCI_HEADER_TYPE) != PCI_HEADER_TYPE_NORMAL)
820 return -EINVAL;
821
822 group = iommu_group_get(&pdev->dev);
823 if (!group)
824 return -EINVAL;
825
826 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
827 if (!vdev) {
828 iommu_group_put(group);
829 return -ENOMEM;
830 }
831
832 vdev->pdev = pdev;
833 vdev->irq_type = VFIO_PCI_NUM_IRQS;
834 mutex_init(&vdev->igate);
835 spin_lock_init(&vdev->irqlock);
836 atomic_set(&vdev->refcnt, 0);
837
838 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
839 if (ret) {
840 iommu_group_put(group);
841 kfree(vdev);
842 }
843
844 return ret;
845}
846
847static void vfio_pci_remove(struct pci_dev *pdev)
848{
849 struct vfio_pci_device *vdev;
850
851 vdev = vfio_del_group_dev(&pdev->dev);
852 if (!vdev)
853 return;
854
855 iommu_group_put(pdev->dev.iommu_group);
856 kfree(vdev);
857}
858
859static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
860 pci_channel_state_t state)
861{
862 struct vfio_pci_device *vdev;
863 struct vfio_device *device;
864
865 device = vfio_device_get_from_dev(&pdev->dev);
866 if (device == NULL)
867 return PCI_ERS_RESULT_DISCONNECT;
868
869 vdev = vfio_device_data(device);
870 if (vdev == NULL) {
871 vfio_device_put(device);
872 return PCI_ERS_RESULT_DISCONNECT;
873 }
874
875 mutex_lock(&vdev->igate);
876
877 if (vdev->err_trigger)
878 eventfd_signal(vdev->err_trigger, 1);
879
880 mutex_unlock(&vdev->igate);
881
882 vfio_device_put(device);
883
884 return PCI_ERS_RESULT_CAN_RECOVER;
885}
886
887static struct pci_error_handlers vfio_err_handlers = {
888 .error_detected = vfio_pci_aer_err_detected,
889};
890
891static struct pci_driver vfio_pci_driver = {
892 .name = "vfio-pci",
893 .id_table = NULL,
894 .probe = vfio_pci_probe,
895 .remove = vfio_pci_remove,
896 .err_handler = &vfio_err_handlers,
897};
898
899static void __exit vfio_pci_cleanup(void)
900{
901 pci_unregister_driver(&vfio_pci_driver);
902 vfio_pci_virqfd_exit();
903 vfio_pci_uninit_perm_bits();
904}
905
906static int __init vfio_pci_init(void)
907{
908 int ret;
909
910
911 ret = vfio_pci_init_perm_bits();
912 if (ret)
913 return ret;
914
915
916 ret = vfio_pci_virqfd_init();
917 if (ret)
918 goto out_virqfd;
919
920
921 ret = pci_register_driver(&vfio_pci_driver);
922 if (ret)
923 goto out_driver;
924
925 return 0;
926
927out_driver:
928 vfio_pci_virqfd_exit();
929out_virqfd:
930 vfio_pci_uninit_perm_bits();
931 return ret;
932}
933
934module_init(vfio_pci_init);
935module_exit(vfio_pci_cleanup);
936
937MODULE_VERSION(DRIVER_VERSION);
938MODULE_LICENSE("GPL v2");
939MODULE_AUTHOR(DRIVER_AUTHOR);
940MODULE_DESCRIPTION(DRIVER_DESC);
941
