1
2
3
4
5
6
7
8
9
10
11
12
13
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/device.h>
17#include <linux/eventfd.h>
18#include <linux/file.h>
19#include <linux/interrupt.h>
20#include <linux/iommu.h>
21#include <linux/module.h>
22#include <linux/mutex.h>
23#include <linux/notifier.h>
24#include <linux/pci.h>
25#include <linux/pm_runtime.h>
26#include <linux/slab.h>
27#include <linux/types.h>
28#include <linux/uaccess.h>
29#include <linux/vfio.h>
30#include <linux/vgaarb.h>
31
32#include "vfio_pci_private.h"
33
34#define DRIVER_VERSION "0.2"
35#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
36#define DRIVER_DESC "VFIO PCI - User Level meta-driver"
37
38static char ids[1024] __initdata;
39module_param_string(ids, ids, sizeof(ids), 0);
40MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified");
41
42static bool nointxmask;
43module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
44MODULE_PARM_DESC(nointxmask,
45 "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.");
46
47#ifdef CONFIG_VFIO_PCI_VGA
48static bool disable_vga;
49module_param(disable_vga, bool, S_IRUGO);
50MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci");
51#endif
52
53static bool disable_idle_d3;
54module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
55MODULE_PARM_DESC(disable_idle_d3,
56 "Disable using the PCI D3 low power state for idle, unused devices");
57
58static DEFINE_MUTEX(driver_lock);
59
60static inline bool vfio_vga_disabled(void)
61{
62#ifdef CONFIG_VFIO_PCI_VGA
63 return disable_vga;
64#else
65 return true;
66#endif
67}
68
69
70
71
72
73
74
75
76
77static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga)
78{
79 struct vfio_pci_device *vdev = opaque;
80 struct pci_dev *tmp = NULL, *pdev = vdev->pdev;
81 unsigned char max_busnr;
82 unsigned int decodes;
83
84 if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
85 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
86 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
87
88 max_busnr = pci_bus_max_busnr(pdev->bus);
89 decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
90
91 while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
92 if (tmp == pdev ||
93 pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
94 pci_is_root_bus(tmp->bus))
95 continue;
96
97 if (tmp->bus->number >= pdev->bus->number &&
98 tmp->bus->number <= max_busnr) {
99 pci_dev_put(tmp);
100 decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
101 break;
102 }
103 }
104
105 return decodes;
106}
107
108static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
109{
110 return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
111}
112
113static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
114
115static int vfio_pci_enable(struct vfio_pci_device *vdev)
116{
117 struct pci_dev *pdev = vdev->pdev;
118 int ret;
119 u16 cmd;
120 u8 msix_pos;
121
122 pci_set_power_state(pdev, PCI_D0);
123
124
125 pci_clear_master(pdev);
126
127 ret = pci_enable_device(pdev);
128 if (ret)
129 return ret;
130
131 vdev->reset_works = (pci_reset_function(pdev) == 0);
132 pci_save_state(pdev);
133 vdev->pci_saved_state = pci_store_saved_state(pdev);
134 if (!vdev->pci_saved_state)
135 pr_debug("%s: Couldn't store %s saved state\n",
136 __func__, dev_name(&pdev->dev));
137
138 ret = vfio_config_init(vdev);
139 if (ret) {
140 kfree(vdev->pci_saved_state);
141 vdev->pci_saved_state = NULL;
142 pci_disable_device(pdev);
143 return ret;
144 }
145
146 if (likely(!nointxmask))
147 vdev->pci_2_3 = pci_intx_mask_supported(pdev);
148
149 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
150 if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
151 cmd &= ~PCI_COMMAND_INTX_DISABLE;
152 pci_write_config_word(pdev, PCI_COMMAND, cmd);
153 }
154
155 msix_pos = pdev->msix_cap;
156 if (msix_pos) {
157 u16 flags;
158 u32 table;
159
160 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
161 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
162
163 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
164 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
165 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
166 } else
167 vdev->msix_bar = 0xFF;
168
169 if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
170 vdev->has_vga = true;
171
172 return 0;
173}
174
175static void vfio_pci_disable(struct vfio_pci_device *vdev)
176{
177 struct pci_dev *pdev = vdev->pdev;
178 int bar;
179
180
181 pci_clear_master(pdev);
182
183 vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
184 VFIO_IRQ_SET_ACTION_TRIGGER,
185 vdev->irq_type, 0, 0, NULL);
186
187 vdev->virq_disabled = false;
188
189 vfio_config_free(vdev);
190
191 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
192 if (!vdev->barmap[bar])
193 continue;
194 pci_iounmap(pdev, vdev->barmap[bar]);
195 pci_release_selected_regions(pdev, 1 << bar);
196 vdev->barmap[bar] = NULL;
197 }
198
199 vdev->needs_reset = true;
200
201
202
203
204
205
206
207 if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
208 pr_info("%s: Couldn't reload %s saved state\n",
209 __func__, dev_name(&pdev->dev));
210
211 if (!vdev->reset_works)
212 goto out;
213
214 pci_save_state(pdev);
215 }
216
217
218
219
220
221 pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
222
223
224
225
226
227 if (vdev->reset_works && !pci_try_reset_function(pdev))
228 vdev->needs_reset = false;
229
230 pci_restore_state(pdev);
231out:
232 pci_disable_device(pdev);
233
234 vfio_pci_try_bus_reset(vdev);
235
236 if (!disable_idle_d3)
237 pci_set_power_state(pdev, PCI_D3hot);
238}
239
240static void vfio_pci_release(void *device_data)
241{
242 struct vfio_pci_device *vdev = device_data;
243
244 mutex_lock(&driver_lock);
245
246 if (!(--vdev->refcnt)) {
247 vfio_spapr_pci_eeh_release(vdev->pdev);
248 vfio_pci_disable(vdev);
249 }
250
251 mutex_unlock(&driver_lock);
252
253 module_put(THIS_MODULE);
254}
255
256static int vfio_pci_open(void *device_data)
257{
258 struct vfio_pci_device *vdev = device_data;
259 int ret = 0;
260
261 if (!try_module_get(THIS_MODULE))
262 return -ENODEV;
263
264 mutex_lock(&driver_lock);
265
266 if (!vdev->refcnt) {
267 ret = vfio_pci_enable(vdev);
268 if (ret)
269 goto error;
270
271 vfio_spapr_pci_eeh_open(vdev->pdev);
272 }
273 vdev->refcnt++;
274error:
275 mutex_unlock(&driver_lock);
276 if (ret)
277 module_put(THIS_MODULE);
278 return ret;
279}
280
281static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
282{
283 if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
284 u8 pin;
285 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
286 if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && pin)
287 return 1;
288
289 } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
290 u8 pos;
291 u16 flags;
292
293 pos = vdev->pdev->msi_cap;
294 if (pos) {
295 pci_read_config_word(vdev->pdev,
296 pos + PCI_MSI_FLAGS, &flags);
297 return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
298 }
299 } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
300 u8 pos;
301 u16 flags;
302
303 pos = vdev->pdev->msix_cap;
304 if (pos) {
305 pci_read_config_word(vdev->pdev,
306 pos + PCI_MSIX_FLAGS, &flags);
307
308 return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
309 }
310 } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
311 if (pci_is_pcie(vdev->pdev))
312 return 1;
313 } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
314 return 1;
315 }
316
317 return 0;
318}
319
320static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
321{
322 (*(int *)data)++;
323 return 0;
324}
325
326struct vfio_pci_fill_info {
327 int max;
328 int cur;
329 struct vfio_pci_dependent_device *devices;
330};
331
332static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
333{
334 struct vfio_pci_fill_info *fill = data;
335 struct iommu_group *iommu_group;
336
337 if (fill->cur == fill->max)
338 return -EAGAIN;
339
340 iommu_group = iommu_group_get(&pdev->dev);
341 if (!iommu_group)
342 return -EPERM;
343
344 fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
345 fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
346 fill->devices[fill->cur].bus = pdev->bus->number;
347 fill->devices[fill->cur].devfn = pdev->devfn;
348 fill->cur++;
349 iommu_group_put(iommu_group);
350 return 0;
351}
352
353struct vfio_pci_group_entry {
354 struct vfio_group *group;
355 int id;
356};
357
358struct vfio_pci_group_info {
359 int count;
360 struct vfio_pci_group_entry *groups;
361};
362
363static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
364{
365 struct vfio_pci_group_info *info = data;
366 struct iommu_group *group;
367 int id, i;
368
369 group = iommu_group_get(&pdev->dev);
370 if (!group)
371 return -EPERM;
372
373 id = iommu_group_id(group);
374
375 for (i = 0; i < info->count; i++)
376 if (info->groups[i].id == id)
377 break;
378
379 iommu_group_put(group);
380
381 return (i == info->count) ? -EINVAL : 0;
382}
383
384static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
385{
386 for (; pdev; pdev = pdev->bus->self)
387 if (pdev->bus == slot->bus)
388 return (pdev->slot == slot);
389 return false;
390}
391
392struct vfio_pci_walk_info {
393 int (*fn)(struct pci_dev *, void *data);
394 void *data;
395 struct pci_dev *pdev;
396 bool slot;
397 int ret;
398};
399
400static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
401{
402 struct vfio_pci_walk_info *walk = data;
403
404 if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
405 walk->ret = walk->fn(pdev, walk->data);
406
407 return walk->ret;
408}
409
410static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
411 int (*fn)(struct pci_dev *,
412 void *data), void *data,
413 bool slot)
414{
415 struct vfio_pci_walk_info walk = {
416 .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
417 };
418
419 pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
420
421 return walk.ret;
422}
423
424static long vfio_pci_ioctl(void *device_data,
425 unsigned int cmd, unsigned long arg)
426{
427 struct vfio_pci_device *vdev = device_data;
428 unsigned long minsz;
429
430 if (cmd == VFIO_DEVICE_GET_INFO) {
431 struct vfio_device_info info;
432
433 minsz = offsetofend(struct vfio_device_info, num_irqs);
434
435 if (copy_from_user(&info, (void __user *)arg, minsz))
436 return -EFAULT;
437
438 if (info.argsz < minsz)
439 return -EINVAL;
440
441 info.flags = VFIO_DEVICE_FLAGS_PCI;
442
443 if (vdev->reset_works)
444 info.flags |= VFIO_DEVICE_FLAGS_RESET;
445
446 info.num_regions = VFIO_PCI_NUM_REGIONS;
447 info.num_irqs = VFIO_PCI_NUM_IRQS;
448
449 return copy_to_user((void __user *)arg, &info, minsz);
450
451 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
452 struct pci_dev *pdev = vdev->pdev;
453 struct vfio_region_info info;
454
455 minsz = offsetofend(struct vfio_region_info, offset);
456
457 if (copy_from_user(&info, (void __user *)arg, minsz))
458 return -EFAULT;
459
460 if (info.argsz < minsz)
461 return -EINVAL;
462
463 switch (info.index) {
464 case VFIO_PCI_CONFIG_REGION_INDEX:
465 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
466 info.size = pdev->cfg_size;
467 info.flags = VFIO_REGION_INFO_FLAG_READ |
468 VFIO_REGION_INFO_FLAG_WRITE;
469 break;
470 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
471 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
472 info.size = pci_resource_len(pdev, info.index);
473 if (!info.size) {
474 info.flags = 0;
475 break;
476 }
477
478 info.flags = VFIO_REGION_INFO_FLAG_READ |
479 VFIO_REGION_INFO_FLAG_WRITE;
480 if (IS_ENABLED(CONFIG_VFIO_PCI_MMAP) &&
481 pci_resource_flags(pdev, info.index) &
482 IORESOURCE_MEM && info.size >= PAGE_SIZE)
483 info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
484 break;
485 case VFIO_PCI_ROM_REGION_INDEX:
486 {
487 void __iomem *io;
488 size_t size;
489
490 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
491 info.flags = 0;
492
493
494 info.size = pci_resource_len(pdev, info.index);
495 if (!info.size)
496 break;
497
498
499 io = pci_map_rom(pdev, &size);
500 if (!io || !size) {
501 info.size = 0;
502 break;
503 }
504 pci_unmap_rom(pdev, io);
505
506 info.flags = VFIO_REGION_INFO_FLAG_READ;
507 break;
508 }
509 case VFIO_PCI_VGA_REGION_INDEX:
510 if (!vdev->has_vga)
511 return -EINVAL;
512
513 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
514 info.size = 0xc0000;
515 info.flags = VFIO_REGION_INFO_FLAG_READ |
516 VFIO_REGION_INFO_FLAG_WRITE;
517
518 break;
519 default:
520 return -EINVAL;
521 }
522
523 return copy_to_user((void __user *)arg, &info, minsz);
524
525 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
526 struct vfio_irq_info info;
527
528 minsz = offsetofend(struct vfio_irq_info, count);
529
530 if (copy_from_user(&info, (void __user *)arg, minsz))
531 return -EFAULT;
532
533 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
534 return -EINVAL;
535
536 switch (info.index) {
537 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
538 case VFIO_PCI_REQ_IRQ_INDEX:
539 break;
540 case VFIO_PCI_ERR_IRQ_INDEX:
541 if (pci_is_pcie(vdev->pdev))
542 break;
543
544 default:
545 return -EINVAL;
546 }
547
548 info.flags = VFIO_IRQ_INFO_EVENTFD;
549
550 info.count = vfio_pci_get_irq_count(vdev, info.index);
551
552 if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
553 info.flags |= (VFIO_IRQ_INFO_MASKABLE |
554 VFIO_IRQ_INFO_AUTOMASKED);
555 else
556 info.flags |= VFIO_IRQ_INFO_NORESIZE;
557
558 return copy_to_user((void __user *)arg, &info, minsz);
559
560 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
561 struct vfio_irq_set hdr;
562 u8 *data = NULL;
563 int ret = 0;
564
565 minsz = offsetofend(struct vfio_irq_set, count);
566
567 if (copy_from_user(&hdr, (void __user *)arg, minsz))
568 return -EFAULT;
569
570 if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS ||
571 hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
572 VFIO_IRQ_SET_ACTION_TYPE_MASK))
573 return -EINVAL;
574
575 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
576 size_t size;
577 int max = vfio_pci_get_irq_count(vdev, hdr.index);
578
579 if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
580 size = sizeof(uint8_t);
581 else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
582 size = sizeof(int32_t);
583 else
584 return -EINVAL;
585
586 if (hdr.argsz - minsz < hdr.count * size ||
587 hdr.start >= max || hdr.start + hdr.count > max)
588 return -EINVAL;
589
590 data = memdup_user((void __user *)(arg + minsz),
591 hdr.count * size);
592 if (IS_ERR(data))
593 return PTR_ERR(data);
594 }
595
596 mutex_lock(&vdev->igate);
597
598 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
599 hdr.start, hdr.count, data);
600
601 mutex_unlock(&vdev->igate);
602 kfree(data);
603
604 return ret;
605
606 } else if (cmd == VFIO_DEVICE_RESET) {
607 return vdev->reset_works ?
608 pci_try_reset_function(vdev->pdev) : -EINVAL;
609
610 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
611 struct vfio_pci_hot_reset_info hdr;
612 struct vfio_pci_fill_info fill = { 0 };
613 struct vfio_pci_dependent_device *devices = NULL;
614 bool slot = false;
615 int ret = 0;
616
617 minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
618
619 if (copy_from_user(&hdr, (void __user *)arg, minsz))
620 return -EFAULT;
621
622 if (hdr.argsz < minsz)
623 return -EINVAL;
624
625 hdr.flags = 0;
626
627
628 if (!pci_probe_reset_slot(vdev->pdev->slot))
629 slot = true;
630 else if (pci_probe_reset_bus(vdev->pdev->bus))
631 return -ENODEV;
632
633
634 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
635 vfio_pci_count_devs,
636 &fill.max, slot);
637 if (ret)
638 return ret;
639
640 WARN_ON(!fill.max);
641
642
643
644
645
646 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
647 ret = -ENOSPC;
648 hdr.count = fill.max;
649 goto reset_info_exit;
650 }
651
652 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
653 if (!devices)
654 return -ENOMEM;
655
656 fill.devices = devices;
657
658 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
659 vfio_pci_fill_devs,
660 &fill, slot);
661
662
663
664
665
666
667 if (!ret)
668 hdr.count = fill.cur;
669
670reset_info_exit:
671 if (copy_to_user((void __user *)arg, &hdr, minsz))
672 ret = -EFAULT;
673
674 if (!ret) {
675 if (copy_to_user((void __user *)(arg + minsz), devices,
676 hdr.count * sizeof(*devices)))
677 ret = -EFAULT;
678 }
679
680 kfree(devices);
681 return ret;
682
683 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
684 struct vfio_pci_hot_reset hdr;
685 int32_t *group_fds;
686 struct vfio_pci_group_entry *groups;
687 struct vfio_pci_group_info info;
688 bool slot = false;
689 int i, count = 0, ret = 0;
690
691 minsz = offsetofend(struct vfio_pci_hot_reset, count);
692
693 if (copy_from_user(&hdr, (void __user *)arg, minsz))
694 return -EFAULT;
695
696 if (hdr.argsz < minsz || hdr.flags)
697 return -EINVAL;
698
699
700 if (!pci_probe_reset_slot(vdev->pdev->slot))
701 slot = true;
702 else if (pci_probe_reset_bus(vdev->pdev->bus))
703 return -ENODEV;
704
705
706
707
708
709
710
711 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
712 vfio_pci_count_devs,
713 &count, slot);
714 if (ret)
715 return ret;
716
717
718 if (!hdr.count || hdr.count > count)
719 return -EINVAL;
720
721 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
722 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
723 if (!group_fds || !groups) {
724 kfree(group_fds);
725 kfree(groups);
726 return -ENOMEM;
727 }
728
729 if (copy_from_user(group_fds, (void __user *)(arg + minsz),
730 hdr.count * sizeof(*group_fds))) {
731 kfree(group_fds);
732 kfree(groups);
733 return -EFAULT;
734 }
735
736
737
738
739
740
741 for (i = 0; i < hdr.count; i++) {
742 struct vfio_group *group;
743 struct fd f = fdget(group_fds[i]);
744 if (!f.file) {
745 ret = -EBADF;
746 break;
747 }
748
749 group = vfio_group_get_external_user(f.file);
750 fdput(f);
751 if (IS_ERR(group)) {
752 ret = PTR_ERR(group);
753 break;
754 }
755
756 groups[i].group = group;
757 groups[i].id = vfio_external_user_iommu_id(group);
758 }
759
760 kfree(group_fds);
761
762
763 if (ret)
764 goto hot_reset_release;
765
766 info.count = hdr.count;
767 info.groups = groups;
768
769
770
771
772
773 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
774 vfio_pci_validate_devs,
775 &info, slot);
776 if (!ret)
777
778 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
779 pci_try_reset_bus(vdev->pdev->bus);
780
781hot_reset_release:
782 for (i--; i >= 0; i--)
783 vfio_group_put_external_user(groups[i].group);
784
785 kfree(groups);
786 return ret;
787 }
788
789 return -ENOTTY;
790}
791
792static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
793 size_t count, loff_t *ppos, bool iswrite)
794{
795 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
796 struct vfio_pci_device *vdev = device_data;
797
798 if (index >= VFIO_PCI_NUM_REGIONS)
799 return -EINVAL;
800
801 switch (index) {
802 case VFIO_PCI_CONFIG_REGION_INDEX:
803 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
804
805 case VFIO_PCI_ROM_REGION_INDEX:
806 if (iswrite)
807 return -EINVAL;
808 return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
809
810 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
811 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
812
813 case VFIO_PCI_VGA_REGION_INDEX:
814 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
815 }
816
817 return -EINVAL;
818}
819
820static ssize_t vfio_pci_read(void *device_data, char __user *buf,
821 size_t count, loff_t *ppos)
822{
823 if (!count)
824 return 0;
825
826 return vfio_pci_rw(device_data, buf, count, ppos, false);
827}
828
829static ssize_t vfio_pci_write(void *device_data, const char __user *buf,
830 size_t count, loff_t *ppos)
831{
832 if (!count)
833 return 0;
834
835 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
836}
837
838static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
839{
840 struct vfio_pci_device *vdev = device_data;
841 struct pci_dev *pdev = vdev->pdev;
842 unsigned int index;
843 u64 phys_len, req_len, pgoff, req_start;
844 int ret;
845
846 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
847
848 if (vma->vm_end < vma->vm_start)
849 return -EINVAL;
850 if ((vma->vm_flags & VM_SHARED) == 0)
851 return -EINVAL;
852 if (index >= VFIO_PCI_ROM_REGION_INDEX)
853 return -EINVAL;
854 if (!(pci_resource_flags(pdev, index) & IORESOURCE_MEM))
855 return -EINVAL;
856
857 phys_len = pci_resource_len(pdev, index);
858 req_len = vma->vm_end - vma->vm_start;
859 pgoff = vma->vm_pgoff &
860 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
861 req_start = pgoff << PAGE_SHIFT;
862
863 if (phys_len < PAGE_SIZE || req_start + req_len > phys_len)
864 return -EINVAL;
865
866 if (index == vdev->msix_bar) {
867
868
869
870
871
872
873
874
875
876
877 if (!(req_start >= vdev->msix_offset + vdev->msix_size ||
878 req_start + req_len <= vdev->msix_offset))
879 return -EINVAL;
880 }
881
882
883
884
885
886 if (!vdev->barmap[index]) {
887 ret = pci_request_selected_regions(pdev,
888 1 << index, "vfio-pci");
889 if (ret)
890 return ret;
891
892 vdev->barmap[index] = pci_iomap(pdev, index, 0);
893 }
894
895 vma->vm_private_data = vdev;
896 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
897 vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
898
899 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
900 req_len, vma->vm_page_prot);
901}
902
903static void vfio_pci_request(void *device_data, unsigned int count)
904{
905 struct vfio_pci_device *vdev = device_data;
906
907 mutex_lock(&vdev->igate);
908
909 if (vdev->req_trigger) {
910 if (!(count % 10))
911 dev_notice_ratelimited(&vdev->pdev->dev,
912 "Relaying device request to user (#%u)\n",
913 count);
914 eventfd_signal(vdev->req_trigger, 1);
915 } else if (count == 0) {
916 dev_warn(&vdev->pdev->dev,
917 "No device request channel registered, blocked until released by user\n");
918 }
919
920 mutex_unlock(&vdev->igate);
921}
922
923static const struct vfio_device_ops vfio_pci_ops = {
924 .name = "vfio-pci",
925 .open = vfio_pci_open,
926 .release = vfio_pci_release,
927 .ioctl = vfio_pci_ioctl,
928 .read = vfio_pci_read,
929 .write = vfio_pci_write,
930 .mmap = vfio_pci_mmap,
931 .request = vfio_pci_request,
932};
933
934static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
935{
936 struct vfio_pci_device *vdev;
937 struct iommu_group *group;
938 int ret;
939
940 if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
941 return -EINVAL;
942
943 group = iommu_group_get(&pdev->dev);
944 if (!group)
945 return -EINVAL;
946
947 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
948 if (!vdev) {
949 iommu_group_put(group);
950 return -ENOMEM;
951 }
952
953 vdev->pdev = pdev;
954 vdev->irq_type = VFIO_PCI_NUM_IRQS;
955 mutex_init(&vdev->igate);
956 spin_lock_init(&vdev->irqlock);
957
958 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
959 if (ret) {
960 iommu_group_put(group);
961 kfree(vdev);
962 return ret;
963 }
964
965 if (vfio_pci_is_vga(pdev)) {
966 vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode);
967 vga_set_legacy_decoding(pdev,
968 vfio_pci_set_vga_decode(vdev, false));
969 }
970
971 if (!disable_idle_d3) {
972
973
974
975
976
977
978
979
980
981 pci_set_power_state(pdev, PCI_D0);
982 pci_set_power_state(pdev, PCI_D3hot);
983 }
984
985 return ret;
986}
987
988static void vfio_pci_remove(struct pci_dev *pdev)
989{
990 struct vfio_pci_device *vdev;
991
992 vdev = vfio_del_group_dev(&pdev->dev);
993 if (!vdev)
994 return;
995
996 iommu_group_put(pdev->dev.iommu_group);
997 kfree(vdev);
998
999 if (vfio_pci_is_vga(pdev)) {
1000 vga_client_register(pdev, NULL, NULL, NULL);
1001 vga_set_legacy_decoding(pdev,
1002 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
1003 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
1004 }
1005
1006 if (!disable_idle_d3)
1007 pci_set_power_state(pdev, PCI_D0);
1008}
1009
1010static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
1011 pci_channel_state_t state)
1012{
1013 struct vfio_pci_device *vdev;
1014 struct vfio_device *device;
1015
1016 device = vfio_device_get_from_dev(&pdev->dev);
1017 if (device == NULL)
1018 return PCI_ERS_RESULT_DISCONNECT;
1019
1020 vdev = vfio_device_data(device);
1021 if (vdev == NULL) {
1022 vfio_device_put(device);
1023 return PCI_ERS_RESULT_DISCONNECT;
1024 }
1025
1026 mutex_lock(&vdev->igate);
1027
1028 if (vdev->err_trigger)
1029 eventfd_signal(vdev->err_trigger, 1);
1030
1031 mutex_unlock(&vdev->igate);
1032
1033 vfio_device_put(device);
1034
1035 return PCI_ERS_RESULT_CAN_RECOVER;
1036}
1037
1038static struct pci_error_handlers vfio_err_handlers = {
1039 .error_detected = vfio_pci_aer_err_detected,
1040};
1041
1042static struct pci_driver vfio_pci_driver = {
1043 .name = "vfio-pci",
1044 .id_table = NULL,
1045 .probe = vfio_pci_probe,
1046 .remove = vfio_pci_remove,
1047 .err_handler = &vfio_err_handlers,
1048};
1049
1050struct vfio_devices {
1051 struct vfio_device **devices;
1052 int cur_index;
1053 int max_index;
1054};
1055
1056static int vfio_pci_get_devs(struct pci_dev *pdev, void *data)
1057{
1058 struct vfio_devices *devs = data;
1059 struct vfio_device *device;
1060
1061 if (devs->cur_index == devs->max_index)
1062 return -ENOSPC;
1063
1064 device = vfio_device_get_from_dev(&pdev->dev);
1065 if (!device)
1066 return -EINVAL;
1067
1068 if (pci_dev_driver(pdev) != &vfio_pci_driver) {
1069 vfio_device_put(device);
1070 return -EBUSY;
1071 }
1072
1073 devs->devices[devs->cur_index++] = device;
1074 return 0;
1075}
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
1090{
1091 struct vfio_devices devs = { .cur_index = 0 };
1092 int i = 0, ret = -EINVAL;
1093 bool needs_reset = false, slot = false;
1094 struct vfio_pci_device *tmp;
1095
1096 if (!pci_probe_reset_slot(vdev->pdev->slot))
1097 slot = true;
1098 else if (pci_probe_reset_bus(vdev->pdev->bus))
1099 return;
1100
1101 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs,
1102 &i, slot) || !i)
1103 return;
1104
1105 devs.max_index = i;
1106 devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL);
1107 if (!devs.devices)
1108 return;
1109
1110 if (vfio_pci_for_each_slot_or_bus(vdev->pdev,
1111 vfio_pci_get_devs, &devs, slot))
1112 goto put_devs;
1113
1114 for (i = 0; i < devs.cur_index; i++) {
1115 tmp = vfio_device_data(devs.devices[i]);
1116 if (tmp->needs_reset)
1117 needs_reset = true;
1118 if (tmp->refcnt)
1119 goto put_devs;
1120 }
1121
1122 if (needs_reset)
1123 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
1124 pci_try_reset_bus(vdev->pdev->bus);
1125
1126put_devs:
1127 for (i = 0; i < devs.cur_index; i++) {
1128 tmp = vfio_device_data(devs.devices[i]);
1129 if (!ret)
1130 tmp->needs_reset = false;
1131
1132 if (!tmp->refcnt && !disable_idle_d3)
1133 pci_set_power_state(tmp->pdev, PCI_D3hot);
1134
1135 vfio_device_put(devs.devices[i]);
1136 }
1137
1138 kfree(devs.devices);
1139}
1140
1141static void __exit vfio_pci_cleanup(void)
1142{
1143 pci_unregister_driver(&vfio_pci_driver);
1144 vfio_pci_uninit_perm_bits();
1145}
1146
1147static void __init vfio_pci_fill_ids(void)
1148{
1149 char *p, *id;
1150 int rc;
1151
1152
1153 if (ids[0] == '\0')
1154 return;
1155
1156
1157 p = ids;
1158 while ((id = strsep(&p, ","))) {
1159 unsigned int vendor, device, subvendor = PCI_ANY_ID,
1160 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
1161 int fields;
1162
1163 if (!strlen(id))
1164 continue;
1165
1166 fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
1167 &vendor, &device, &subvendor, &subdevice,
1168 &class, &class_mask);
1169
1170 if (fields < 2) {
1171 pr_warn("invalid id string \"%s\"\n", id);
1172 continue;
1173 }
1174
1175 rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
1176 subvendor, subdevice, class, class_mask, 0);
1177 if (rc)
1178 pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n",
1179 vendor, device, subvendor, subdevice,
1180 class, class_mask, rc);
1181 else
1182 pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n",
1183 vendor, device, subvendor, subdevice,
1184 class, class_mask);
1185 }
1186}
1187
1188static int __init vfio_pci_init(void)
1189{
1190 int ret;
1191
1192
1193 ret = vfio_pci_init_perm_bits();
1194 if (ret)
1195 return ret;
1196
1197
1198 ret = pci_register_driver(&vfio_pci_driver);
1199 if (ret)
1200 goto out_driver;
1201
1202 vfio_pci_fill_ids();
1203
1204 return 0;
1205
1206out_driver:
1207 vfio_pci_uninit_perm_bits();
1208 return ret;
1209}
1210
1211module_init(vfio_pci_init);
1212module_exit(vfio_pci_cleanup);
1213
1214MODULE_VERSION(DRIVER_VERSION);
1215MODULE_LICENSE("GPL v2");
1216MODULE_AUTHOR(DRIVER_AUTHOR);
1217MODULE_DESCRIPTION(DRIVER_DESC);
1218
