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svcrdma: Ignore source port when computing DRC hash
[linux/fpc-iii.git] / drivers / vfio / pci / vfio_pci.c
blob6cf00d9f512b7a214ff00988be49e12b05e1e533
1 /*
2 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
3 * Author: Alex Williamson <alex.williamson@redhat.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Derived from original vfio:
10 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
11 * Author: Tom Lyon, pugs@cisco.com
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 #include <linux/nospec.h>
32
33 #include "vfio_pci_private.h"
34
35 #define DRIVER_VERSION "0.2"
36 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
37 #define DRIVER_DESC "VFIO PCI - User Level meta-driver"
38
39 static char ids[1024] __initdata;
40 module_param_string(ids, ids, sizeof(ids), 0);
41 MODULE_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");
42
43 static bool nointxmask;
44 module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
45 MODULE_PARM_DESC(nointxmask,
46 "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.");
47
48 #ifdef CONFIG_VFIO_PCI_VGA
49 static bool disable_vga;
50 module_param(disable_vga, bool, S_IRUGO);
51 MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci");
52 #endif
53
54 static bool disable_idle_d3;
55 module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
56 MODULE_PARM_DESC(disable_idle_d3,
57 "Disable using the PCI D3 low power state for idle, unused devices");
58
59 static DEFINE_MUTEX(driver_lock);
60
61 static inline bool vfio_vga_disabled(void)
62 {
63 #ifdef CONFIG_VFIO_PCI_VGA
64 return disable_vga;
65 #else
66 return true;
67 #endif
68 }
69
70 /*
71 * Our VGA arbiter participation is limited since we don't know anything
72 * about the device itself. However, if the device is the only VGA device
73 * downstream of a bridge and VFIO VGA support is disabled, then we can
74 * safely return legacy VGA IO and memory as not decoded since the user
75 * has no way to get to it and routing can be disabled externally at the
76 * bridge.
77 */
78 static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga)
79 {
80 struct vfio_pci_device *vdev = opaque;
81 struct pci_dev *tmp = NULL, *pdev = vdev->pdev;
82 unsigned char max_busnr;
83 unsigned int decodes;
84
85 if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
86 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
87 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
88
89 max_busnr = pci_bus_max_busnr(pdev->bus);
90 decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
91
92 while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
93 if (tmp == pdev ||
94 pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
95 pci_is_root_bus(tmp->bus))
96 continue;
97
98 if (tmp->bus->number >= pdev->bus->number &&
99 tmp->bus->number <= max_busnr) {
100 pci_dev_put(tmp);
101 decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
102 break;
103 }
104 }
105
106 return decodes;
107 }
108
109 static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
110 {
111 return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
112 }
113
114 static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
115 {
116 struct resource *res;
117 int bar;
118 struct vfio_pci_dummy_resource *dummy_res;
119
120 INIT_LIST_HEAD(&vdev->dummy_resources_list);
121
122 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
123 res = vdev->pdev->resource + bar;
124
125 if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
126 goto no_mmap;
127
128 if (!(res->flags & IORESOURCE_MEM))
129 goto no_mmap;
130
131 /*
132 * The PCI core shouldn't set up a resource with a
133 * type but zero size. But there may be bugs that
134 * cause us to do that.
135 */
136 if (!resource_size(res))
137 goto no_mmap;
138
139 if (resource_size(res) >= PAGE_SIZE) {
140 vdev->bar_mmap_supported[bar] = true;
141 continue;
142 }
143
144 if (!(res->start & ~PAGE_MASK)) {
145 /*
146 * Add a dummy resource to reserve the remainder
147 * of the exclusive page in case that hot-add
148 * device's bar is assigned into it.
149 */
150 dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL);
151 if (dummy_res == NULL)
152 goto no_mmap;
153
154 dummy_res->resource.name = "vfio sub-page reserved";
155 dummy_res->resource.start = res->end + 1;
156 dummy_res->resource.end = res->start + PAGE_SIZE - 1;
157 dummy_res->resource.flags = res->flags;
158 if (request_resource(res->parent,
159 &dummy_res->resource)) {
160 kfree(dummy_res);
161 goto no_mmap;
162 }
163 dummy_res->index = bar;
164 list_add(&dummy_res->res_next,
165 &vdev->dummy_resources_list);
166 vdev->bar_mmap_supported[bar] = true;
167 continue;
168 }
169 /*
170 * Here we don't handle the case when the BAR is not page
171 * aligned because we can't expect the BAR will be
172 * assigned into the same location in a page in guest
173 * when we passthrough the BAR. And it's hard to access
174 * this BAR in userspace because we have no way to get
175 * the BAR's location in a page.
176 */
177 no_mmap:
178 vdev->bar_mmap_supported[bar] = false;
179 }
180 }
181
182 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
183 static void vfio_pci_disable(struct vfio_pci_device *vdev);
184
185 /*
186 * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
187 * _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
188 * If a device implements the former but not the latter we would typically
189 * expect broken_intx_masking be set and require an exclusive interrupt.
190 * However since we do have control of the device's ability to assert INTx,
191 * we can instead pretend that the device does not implement INTx, virtualizing
192 * the pin register to report zero and maintaining DisINTx set on the host.
193 */
194 static bool vfio_pci_nointx(struct pci_dev *pdev)
195 {
196 switch (pdev->vendor) {
197 case PCI_VENDOR_ID_INTEL:
198 switch (pdev->device) {
199 /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */
200 case 0x1572:
201 case 0x1574:
202 case 0x1580 ... 0x1581:
203 case 0x1583 ... 0x158b:
204 case 0x37d0 ... 0x37d2:
205 return true;
206 default:
207 return false;
208 }
209 }
210
211 return false;
212 }
213
214 static int vfio_pci_enable(struct vfio_pci_device *vdev)
215 {
216 struct pci_dev *pdev = vdev->pdev;
217 int ret;
218 u16 cmd;
219 u8 msix_pos;
220
221 pci_set_power_state(pdev, PCI_D0);
222
223 /* Don't allow our initial saved state to include busmaster */
224 pci_clear_master(pdev);
225
226 ret = pci_enable_device(pdev);
227 if (ret)
228 return ret;
229
230 /* If reset fails because of the device lock, fail this path entirely */
231 ret = pci_try_reset_function(pdev);
232 if (ret == -EAGAIN) {
233 pci_disable_device(pdev);
234 return ret;
235 }
236
237 vdev->reset_works = !ret;
238 pci_save_state(pdev);
239 vdev->pci_saved_state = pci_store_saved_state(pdev);
240 if (!vdev->pci_saved_state)
241 pr_debug("%s: Couldn't store %s saved state\n",
242 __func__, dev_name(&pdev->dev));
243
244 if (likely(!nointxmask)) {
245 if (vfio_pci_nointx(pdev)) {
246 dev_info(&pdev->dev, "Masking broken INTx support\n");
247 vdev->nointx = true;
248 pci_intx(pdev, 0);
249 } else
250 vdev->pci_2_3 = pci_intx_mask_supported(pdev);
251 }
252
253 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
254 if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
255 cmd &= ~PCI_COMMAND_INTX_DISABLE;
256 pci_write_config_word(pdev, PCI_COMMAND, cmd);
257 }
258
259 ret = vfio_config_init(vdev);
260 if (ret) {
261 kfree(vdev->pci_saved_state);
262 vdev->pci_saved_state = NULL;
263 pci_disable_device(pdev);
264 return ret;
265 }
266
267 msix_pos = pdev->msix_cap;
268 if (msix_pos) {
269 u16 flags;
270 u32 table;
271
272 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
273 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
274
275 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
276 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
277 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
278 } else
279 vdev->msix_bar = 0xFF;
280
281 if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
282 vdev->has_vga = true;
283
284
285 if (vfio_pci_is_vga(pdev) &&
286 pdev->vendor == PCI_VENDOR_ID_INTEL &&
287 IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
288 ret = vfio_pci_igd_init(vdev);
289 if (ret) {
290 dev_warn(&vdev->pdev->dev,
291 "Failed to setup Intel IGD regions\n");
292 vfio_pci_disable(vdev);
293 return ret;
294 }
295 }
296
297 vfio_pci_probe_mmaps(vdev);
298
299 return 0;
300 }
301
302 static void vfio_pci_disable(struct vfio_pci_device *vdev)
303 {
304 struct pci_dev *pdev = vdev->pdev;
305 struct vfio_pci_dummy_resource *dummy_res, *tmp;
306 struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp;
307 int i, bar;
308
309 /* Stop the device from further DMA */
310 pci_clear_master(pdev);
311
312 vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
313 VFIO_IRQ_SET_ACTION_TRIGGER,
314 vdev->irq_type, 0, 0, NULL);
315
316 /* Device closed, don't need mutex here */
317 list_for_each_entry_safe(ioeventfd, ioeventfd_tmp,
318 &vdev->ioeventfds_list, next) {
319 vfio_virqfd_disable(&ioeventfd->virqfd);
320 list_del(&ioeventfd->next);
321 kfree(ioeventfd);
322 }
323 vdev->ioeventfds_nr = 0;
324
325 vdev->virq_disabled = false;
326
327 for (i = 0; i < vdev->num_regions; i++)
328 vdev->region[i].ops->release(vdev, &vdev->region[i]);
329
330 vdev->num_regions = 0;
331 kfree(vdev->region);
332 vdev->region = NULL; /* don't krealloc a freed pointer */
333
334 vfio_config_free(vdev);
335
336 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
337 if (!vdev->barmap[bar])
338 continue;
339 pci_iounmap(pdev, vdev->barmap[bar]);
340 pci_release_selected_regions(pdev, 1 << bar);
341 vdev->barmap[bar] = NULL;
342 }
343
344 list_for_each_entry_safe(dummy_res, tmp,
345 &vdev->dummy_resources_list, res_next) {
346 list_del(&dummy_res->res_next);
347 release_resource(&dummy_res->resource);
348 kfree(dummy_res);
349 }
350
351 vdev->needs_reset = true;
352
353 /*
354 * If we have saved state, restore it. If we can reset the device,
355 * even better. Resetting with current state seems better than
356 * nothing, but saving and restoring current state without reset
357 * is just busy work.
358 */
359 if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
360 pr_info("%s: Couldn't reload %s saved state\n",
361 __func__, dev_name(&pdev->dev));
362
363 if (!vdev->reset_works)
364 goto out;
365
366 pci_save_state(pdev);
367 }
368
369 /*
370 * Disable INTx and MSI, presumably to avoid spurious interrupts
371 * during reset. Stolen from pci_reset_function()
372 */
373 pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
374
375 /*
376 * Try to reset the device. The success of this is dependent on
377 * being able to lock the device, which is not always possible.
378 */
379 if (vdev->reset_works && !pci_try_reset_function(pdev))
380 vdev->needs_reset = false;
381
382 pci_restore_state(pdev);
383 out:
384 pci_disable_device(pdev);
385
386 vfio_pci_try_bus_reset(vdev);
387
388 if (!disable_idle_d3)
389 pci_set_power_state(pdev, PCI_D3hot);
390 }
391
392 static void vfio_pci_release(void *device_data)
393 {
394 struct vfio_pci_device *vdev = device_data;
395
396 mutex_lock(&driver_lock);
397
398 if (!(--vdev->refcnt)) {
399 vfio_spapr_pci_eeh_release(vdev->pdev);
400 vfio_pci_disable(vdev);
401 }
402
403 mutex_unlock(&driver_lock);
404
405 module_put(THIS_MODULE);
406 }
407
408 static int vfio_pci_open(void *device_data)
409 {
410 struct vfio_pci_device *vdev = device_data;
411 int ret = 0;
412
413 if (!try_module_get(THIS_MODULE))
414 return -ENODEV;
415
416 mutex_lock(&driver_lock);
417
418 if (!vdev->refcnt) {
419 ret = vfio_pci_enable(vdev);
420 if (ret)
421 goto error;
422
423 vfio_spapr_pci_eeh_open(vdev->pdev);
424 }
425 vdev->refcnt++;
426 error:
427 mutex_unlock(&driver_lock);
428 if (ret)
429 module_put(THIS_MODULE);
430 return ret;
431 }
432
433 static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
434 {
435 if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
436 u8 pin;
437 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
438 if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && !vdev->nointx && pin)
439 return 1;
440
441 } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
442 u8 pos;
443 u16 flags;
444
445 pos = vdev->pdev->msi_cap;
446 if (pos) {
447 pci_read_config_word(vdev->pdev,
448 pos + PCI_MSI_FLAGS, &flags);
449 return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
450 }
451 } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
452 u8 pos;
453 u16 flags;
454
455 pos = vdev->pdev->msix_cap;
456 if (pos) {
457 pci_read_config_word(vdev->pdev,
458 pos + PCI_MSIX_FLAGS, &flags);
459
460 return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
461 }
462 } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
463 if (pci_is_pcie(vdev->pdev))
464 return 1;
465 } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
466 return 1;
467 }
468
469 return 0;
470 }
471
472 static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
473 {
474 (*(int *)data)++;
475 return 0;
476 }
477
478 struct vfio_pci_fill_info {
479 int max;
480 int cur;
481 struct vfio_pci_dependent_device *devices;
482 };
483
484 static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
485 {
486 struct vfio_pci_fill_info *fill = data;
487 struct iommu_group *iommu_group;
488
489 if (fill->cur == fill->max)
490 return -EAGAIN; /* Something changed, try again */
491
492 iommu_group = iommu_group_get(&pdev->dev);
493 if (!iommu_group)
494 return -EPERM; /* Cannot reset non-isolated devices */
495
496 fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
497 fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
498 fill->devices[fill->cur].bus = pdev->bus->number;
499 fill->devices[fill->cur].devfn = pdev->devfn;
500 fill->cur++;
501 iommu_group_put(iommu_group);
502 return 0;
503 }
504
505 struct vfio_pci_group_entry {
506 struct vfio_group *group;
507 int id;
508 };
509
510 struct vfio_pci_group_info {
511 int count;
512 struct vfio_pci_group_entry *groups;
513 };
514
515 static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
516 {
517 struct vfio_pci_group_info *info = data;
518 struct iommu_group *group;
519 int id, i;
520
521 group = iommu_group_get(&pdev->dev);
522 if (!group)
523 return -EPERM;
524
525 id = iommu_group_id(group);
526
527 for (i = 0; i < info->count; i++)
528 if (info->groups[i].id == id)
529 break;
530
531 iommu_group_put(group);
532
533 return (i == info->count) ? -EINVAL : 0;
534 }
535
536 static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
537 {
538 for (; pdev; pdev = pdev->bus->self)
539 if (pdev->bus == slot->bus)
540 return (pdev->slot == slot);
541 return false;
542 }
543
544 struct vfio_pci_walk_info {
545 int (*fn)(struct pci_dev *, void *data);
546 void *data;
547 struct pci_dev *pdev;
548 bool slot;
549 int ret;
550 };
551
552 static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
553 {
554 struct vfio_pci_walk_info *walk = data;
555
556 if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
557 walk->ret = walk->fn(pdev, walk->data);
558
559 return walk->ret;
560 }
561
562 static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
563 int (*fn)(struct pci_dev *,
564 void *data), void *data,
565 bool slot)
566 {
567 struct vfio_pci_walk_info walk = {
568 .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
569 };
570
571 pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
572
573 return walk.ret;
574 }
575
576 static int msix_mmappable_cap(struct vfio_pci_device *vdev,
577 struct vfio_info_cap *caps)
578 {
579 struct vfio_info_cap_header header = {
580 .id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE,
581 .version = 1
582 };
583
584 return vfio_info_add_capability(caps, &header, sizeof(header));
585 }
586
587 int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
588 unsigned int type, unsigned int subtype,
589 const struct vfio_pci_regops *ops,
590 size_t size, u32 flags, void *data)
591 {
592 struct vfio_pci_region *region;
593
594 region = krealloc(vdev->region,
595 (vdev->num_regions + 1) * sizeof(*region),
596 GFP_KERNEL);
597 if (!region)
598 return -ENOMEM;
599
600 vdev->region = region;
601 vdev->region[vdev->num_regions].type = type;
602 vdev->region[vdev->num_regions].subtype = subtype;
603 vdev->region[vdev->num_regions].ops = ops;
604 vdev->region[vdev->num_regions].size = size;
605 vdev->region[vdev->num_regions].flags = flags;
606 vdev->region[vdev->num_regions].data = data;
607
608 vdev->num_regions++;
609
610 return 0;
611 }
612
613 static long vfio_pci_ioctl(void *device_data,
614 unsigned int cmd, unsigned long arg)
615 {
616 struct vfio_pci_device *vdev = device_data;
617 unsigned long minsz;
618
619 if (cmd == VFIO_DEVICE_GET_INFO) {
620 struct vfio_device_info info;
621
622 minsz = offsetofend(struct vfio_device_info, num_irqs);
623
624 if (copy_from_user(&info, (void __user *)arg, minsz))
625 return -EFAULT;
626
627 if (info.argsz < minsz)
628 return -EINVAL;
629
630 info.flags = VFIO_DEVICE_FLAGS_PCI;
631
632 if (vdev->reset_works)
633 info.flags |= VFIO_DEVICE_FLAGS_RESET;
634
635 info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
636 info.num_irqs = VFIO_PCI_NUM_IRQS;
637
638 return copy_to_user((void __user *)arg, &info, minsz) ?
639 -EFAULT : 0;
640
641 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
642 struct pci_dev *pdev = vdev->pdev;
643 struct vfio_region_info info;
644 struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
645 int i, ret;
646
647 minsz = offsetofend(struct vfio_region_info, offset);
648
649 if (copy_from_user(&info, (void __user *)arg, minsz))
650 return -EFAULT;
651
652 if (info.argsz < minsz)
653 return -EINVAL;
654
655 switch (info.index) {
656 case VFIO_PCI_CONFIG_REGION_INDEX:
657 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
658 info.size = pdev->cfg_size;
659 info.flags = VFIO_REGION_INFO_FLAG_READ |
660 VFIO_REGION_INFO_FLAG_WRITE;
661 break;
662 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
663 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
664 info.size = pci_resource_len(pdev, info.index);
665 if (!info.size) {
666 info.flags = 0;
667 break;
668 }
669
670 info.flags = VFIO_REGION_INFO_FLAG_READ |
671 VFIO_REGION_INFO_FLAG_WRITE;
672 if (vdev->bar_mmap_supported[info.index]) {
673 info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
674 if (info.index == vdev->msix_bar) {
675 ret = msix_mmappable_cap(vdev, &caps);
676 if (ret)
677 return ret;
678 }
679 }
680
681 break;
682 case VFIO_PCI_ROM_REGION_INDEX:
683 {
684 void __iomem *io;
685 size_t size;
686
687 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
688 info.flags = 0;
689
690 /* Report the BAR size, not the ROM size */
691 info.size = pci_resource_len(pdev, info.index);
692 if (!info.size) {
693 /* Shadow ROMs appear as PCI option ROMs */
694 if (pdev->resource[PCI_ROM_RESOURCE].flags &
695 IORESOURCE_ROM_SHADOW)
696 info.size = 0x20000;
697 else
698 break;
699 }
700
701 /* Is it really there? */
702 io = pci_map_rom(pdev, &size);
703 if (!io || !size) {
704 info.size = 0;
705 break;
706 }
707 pci_unmap_rom(pdev, io);
708
709 info.flags = VFIO_REGION_INFO_FLAG_READ;
710 break;
711 }
712 case VFIO_PCI_VGA_REGION_INDEX:
713 if (!vdev->has_vga)
714 return -EINVAL;
715
716 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
717 info.size = 0xc0000;
718 info.flags = VFIO_REGION_INFO_FLAG_READ |
719 VFIO_REGION_INFO_FLAG_WRITE;
720
721 break;
722 default:
723 {
724 struct vfio_region_info_cap_type cap_type = {
725 .header.id = VFIO_REGION_INFO_CAP_TYPE,
726 .header.version = 1 };
727
728 if (info.index >=
729 VFIO_PCI_NUM_REGIONS + vdev->num_regions)
730 return -EINVAL;
731 info.index = array_index_nospec(info.index,
732 VFIO_PCI_NUM_REGIONS +
733 vdev->num_regions);
734
735 i = info.index - VFIO_PCI_NUM_REGIONS;
736
737 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
738 info.size = vdev->region[i].size;
739 info.flags = vdev->region[i].flags;
740
741 cap_type.type = vdev->region[i].type;
742 cap_type.subtype = vdev->region[i].subtype;
743
744 ret = vfio_info_add_capability(&caps, &cap_type.header,
745 sizeof(cap_type));
746 if (ret)
747 return ret;
748
749 }
750 }
751
752 if (caps.size) {
753 info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
754 if (info.argsz < sizeof(info) + caps.size) {
755 info.argsz = sizeof(info) + caps.size;
756 info.cap_offset = 0;
757 } else {
758 vfio_info_cap_shift(&caps, sizeof(info));
759 if (copy_to_user((void __user *)arg +
760 sizeof(info), caps.buf,
761 caps.size)) {
762 kfree(caps.buf);
763 return -EFAULT;
764 }
765 info.cap_offset = sizeof(info);
766 }
767
768 kfree(caps.buf);
769 }
770
771 return copy_to_user((void __user *)arg, &info, minsz) ?
772 -EFAULT : 0;
773
774 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
775 struct vfio_irq_info info;
776
777 minsz = offsetofend(struct vfio_irq_info, count);
778
779 if (copy_from_user(&info, (void __user *)arg, minsz))
780 return -EFAULT;
781
782 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
783 return -EINVAL;
784
785 switch (info.index) {
786 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
787 case VFIO_PCI_REQ_IRQ_INDEX:
788 break;
789 case VFIO_PCI_ERR_IRQ_INDEX:
790 if (pci_is_pcie(vdev->pdev))
791 break;
792 /* fall through */
793 default:
794 return -EINVAL;
795 }
796
797 info.flags = VFIO_IRQ_INFO_EVENTFD;
798
799 info.count = vfio_pci_get_irq_count(vdev, info.index);
800
801 if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
802 info.flags |= (VFIO_IRQ_INFO_MASKABLE |
803 VFIO_IRQ_INFO_AUTOMASKED);
804 else
805 info.flags |= VFIO_IRQ_INFO_NORESIZE;
806
807 return copy_to_user((void __user *)arg, &info, minsz) ?
808 -EFAULT : 0;
809
810 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
811 struct vfio_irq_set hdr;
812 u8 *data = NULL;
813 int max, ret = 0;
814 size_t data_size = 0;
815
816 minsz = offsetofend(struct vfio_irq_set, count);
817
818 if (copy_from_user(&hdr, (void __user *)arg, minsz))
819 return -EFAULT;
820
821 max = vfio_pci_get_irq_count(vdev, hdr.index);
822
823 ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
824 VFIO_PCI_NUM_IRQS, &data_size);
825 if (ret)
826 return ret;
827
828 if (data_size) {
829 data = memdup_user((void __user *)(arg + minsz),
830 data_size);
831 if (IS_ERR(data))
832 return PTR_ERR(data);
833 }
834
835 mutex_lock(&vdev->igate);
836
837 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
838 hdr.start, hdr.count, data);
839
840 mutex_unlock(&vdev->igate);
841 kfree(data);
842
843 return ret;
844
845 } else if (cmd == VFIO_DEVICE_RESET) {
846 return vdev->reset_works ?
847 pci_try_reset_function(vdev->pdev) : -EINVAL;
848
849 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
850 struct vfio_pci_hot_reset_info hdr;
851 struct vfio_pci_fill_info fill = { 0 };
852 struct vfio_pci_dependent_device *devices = NULL;
853 bool slot = false;
854 int ret = 0;
855
856 minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
857
858 if (copy_from_user(&hdr, (void __user *)arg, minsz))
859 return -EFAULT;
860
861 if (hdr.argsz < minsz)
862 return -EINVAL;
863
864 hdr.flags = 0;
865
866 /* Can we do a slot or bus reset or neither? */
867 if (!pci_probe_reset_slot(vdev->pdev->slot))
868 slot = true;
869 else if (pci_probe_reset_bus(vdev->pdev->bus))
870 return -ENODEV;
871
872 /* How many devices are affected? */
873 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
874 vfio_pci_count_devs,
875 &fill.max, slot);
876 if (ret)
877 return ret;
878
879 WARN_ON(!fill.max); /* Should always be at least one */
880
881 /*
882 * If there's enough space, fill it now, otherwise return
883 * -ENOSPC and the number of devices affected.
884 */
885 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
886 ret = -ENOSPC;
887 hdr.count = fill.max;
888 goto reset_info_exit;
889 }
890
891 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
892 if (!devices)
893 return -ENOMEM;
894
895 fill.devices = devices;
896
897 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
898 vfio_pci_fill_devs,
899 &fill, slot);
900
901 /*
902 * If a device was removed between counting and filling,
903 * we may come up short of fill.max. If a device was
904 * added, we'll have a return of -EAGAIN above.
905 */
906 if (!ret)
907 hdr.count = fill.cur;
908
909 reset_info_exit:
910 if (copy_to_user((void __user *)arg, &hdr, minsz))
911 ret = -EFAULT;
912
913 if (!ret) {
914 if (copy_to_user((void __user *)(arg + minsz), devices,
915 hdr.count * sizeof(*devices)))
916 ret = -EFAULT;
917 }
918
919 kfree(devices);
920 return ret;
921
922 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
923 struct vfio_pci_hot_reset hdr;
924 int32_t *group_fds;
925 struct vfio_pci_group_entry *groups;
926 struct vfio_pci_group_info info;
927 bool slot = false;
928 int i, count = 0, ret = 0;
929
930 minsz = offsetofend(struct vfio_pci_hot_reset, count);
931
932 if (copy_from_user(&hdr, (void __user *)arg, minsz))
933 return -EFAULT;
934
935 if (hdr.argsz < minsz || hdr.flags)
936 return -EINVAL;
937
938 /* Can we do a slot or bus reset or neither? */
939 if (!pci_probe_reset_slot(vdev->pdev->slot))
940 slot = true;
941 else if (pci_probe_reset_bus(vdev->pdev->bus))
942 return -ENODEV;
943
944 /*
945 * We can't let userspace give us an arbitrarily large
946 * buffer to copy, so verify how many we think there
947 * could be. Note groups can have multiple devices so
948 * one group per device is the max.
949 */
950 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
951 vfio_pci_count_devs,
952 &count, slot);
953 if (ret)
954 return ret;
955
956 /* Somewhere between 1 and count is OK */
957 if (!hdr.count || hdr.count > count)
958 return -EINVAL;
959
960 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
961 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
962 if (!group_fds || !groups) {
963 kfree(group_fds);
964 kfree(groups);
965 return -ENOMEM;
966 }
967
968 if (copy_from_user(group_fds, (void __user *)(arg + minsz),
969 hdr.count * sizeof(*group_fds))) {
970 kfree(group_fds);
971 kfree(groups);
972 return -EFAULT;
973 }
974
975 /*
976 * For each group_fd, get the group through the vfio external
977 * user interface and store the group and iommu ID. This
978 * ensures the group is held across the reset.
979 */
980 for (i = 0; i < hdr.count; i++) {
981 struct vfio_group *group;
982 struct fd f = fdget(group_fds[i]);
983 if (!f.file) {
984 ret = -EBADF;
985 break;
986 }
987
988 group = vfio_group_get_external_user(f.file);
989 fdput(f);
990 if (IS_ERR(group)) {
991 ret = PTR_ERR(group);
992 break;
993 }
994
995 groups[i].group = group;
996 groups[i].id = vfio_external_user_iommu_id(group);
997 }
998
999 kfree(group_fds);
1000
1001 /* release reference to groups on error */
1002 if (ret)
1003 goto hot_reset_release;
1004
1005 info.count = hdr.count;
1006 info.groups = groups;
1007
1008 /*
1009 * Test whether all the affected devices are contained
1010 * by the set of groups provided by the user.
1011 */
1012 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
1013 vfio_pci_validate_devs,
1014 &info, slot);
1015 if (!ret)
1016 /* User has access, do the reset */
1017 ret = pci_reset_bus(vdev->pdev);
1018
1019 hot_reset_release:
1020 for (i--; i >= 0; i--)
1021 vfio_group_put_external_user(groups[i].group);
1022
1023 kfree(groups);
1024 return ret;
1025 } else if (cmd == VFIO_DEVICE_IOEVENTFD) {
1026 struct vfio_device_ioeventfd ioeventfd;
1027 int count;
1028
1029 minsz = offsetofend(struct vfio_device_ioeventfd, fd);
1030
1031 if (copy_from_user(&ioeventfd, (void __user *)arg, minsz))
1032 return -EFAULT;
1033
1034 if (ioeventfd.argsz < minsz)
1035 return -EINVAL;
1036
1037 if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK)
1038 return -EINVAL;
1039
1040 count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK;
1041
1042 if (hweight8(count) != 1 || ioeventfd.fd < -1)
1043 return -EINVAL;
1044
1045 return vfio_pci_ioeventfd(vdev, ioeventfd.offset,
1046 ioeventfd.data, count, ioeventfd.fd);
1047 }
1048
1049 return -ENOTTY;
1050 }
1051
1052 static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
1053 size_t count, loff_t *ppos, bool iswrite)
1054 {
1055 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
1056 struct vfio_pci_device *vdev = device_data;
1057
1058 if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
1059 return -EINVAL;
1060
1061 switch (index) {
1062 case VFIO_PCI_CONFIG_REGION_INDEX:
1063 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
1064
1065 case VFIO_PCI_ROM_REGION_INDEX:
1066 if (iswrite)
1067 return -EINVAL;
1068 return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
1069
1070 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
1071 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
1072
1073 case VFIO_PCI_VGA_REGION_INDEX:
1074 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
1075 default:
1076 index -= VFIO_PCI_NUM_REGIONS;
1077 return vdev->region[index].ops->rw(vdev, buf,
1078 count, ppos, iswrite);
1079 }
1080
1081 return -EINVAL;
1082 }
1083
1084 static ssize_t vfio_pci_read(void *device_data, char __user *buf,
1085 size_t count, loff_t *ppos)
1086 {
1087 if (!count)
1088 return 0;
1089
1090 return vfio_pci_rw(device_data, buf, count, ppos, false);
1091 }
1092
1093 static ssize_t vfio_pci_write(void *device_data, const char __user *buf,
1094 size_t count, loff_t *ppos)
1095 {
1096 if (!count)
1097 return 0;
1098
1099 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
1100 }
1101
1102 static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
1103 {
1104 struct vfio_pci_device *vdev = device_data;
1105 struct pci_dev *pdev = vdev->pdev;
1106 unsigned int index;
1107 u64 phys_len, req_len, pgoff, req_start;
1108 int ret;
1109
1110 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
1111
1112 if (vma->vm_end < vma->vm_start)
1113 return -EINVAL;
1114 if ((vma->vm_flags & VM_SHARED) == 0)
1115 return -EINVAL;
1116 if (index >= VFIO_PCI_ROM_REGION_INDEX)
1117 return -EINVAL;
1118 if (!vdev->bar_mmap_supported[index])
1119 return -EINVAL;
1120
1121 phys_len = PAGE_ALIGN(pci_resource_len(pdev, index));
1122 req_len = vma->vm_end - vma->vm_start;
1123 pgoff = vma->vm_pgoff &
1124 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
1125 req_start = pgoff << PAGE_SHIFT;
1126
1127 if (req_start + req_len > phys_len)
1128 return -EINVAL;
1129
1130 /*
1131 * Even though we don't make use of the barmap for the mmap,
1132 * we need to request the region and the barmap tracks that.
1133 */
1134 if (!vdev->barmap[index]) {
1135 ret = pci_request_selected_regions(pdev,
1136 1 << index, "vfio-pci");
1137 if (ret)
1138 return ret;
1139
1140 vdev->barmap[index] = pci_iomap(pdev, index, 0);
1141 if (!vdev->barmap[index]) {
1142 pci_release_selected_regions(pdev, 1 << index);
1143 return -ENOMEM;
1144 }
1145 }
1146
1147 vma->vm_private_data = vdev;
1148 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1149 vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
1150
1151 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
1152 req_len, vma->vm_page_prot);
1153 }
1154
1155 static void vfio_pci_request(void *device_data, unsigned int count)
1156 {
1157 struct vfio_pci_device *vdev = device_data;
1158
1159 mutex_lock(&vdev->igate);
1160
1161 if (vdev->req_trigger) {
1162 if (!(count % 10))
1163 dev_notice_ratelimited(&vdev->pdev->dev,
1164 "Relaying device request to user (#%u)\n",
1165 count);
1166 eventfd_signal(vdev->req_trigger, 1);
1167 } else if (count == 0) {
1168 dev_warn(&vdev->pdev->dev,
1169 "No device request channel registered, blocked until released by user\n");
1170 }
1171
1172 mutex_unlock(&vdev->igate);
1173 }
1174
1175 static const struct vfio_device_ops vfio_pci_ops = {
1176 .name = "vfio-pci",
1177 .open = vfio_pci_open,
1178 .release = vfio_pci_release,
1179 .ioctl = vfio_pci_ioctl,
1180 .read = vfio_pci_read,
1181 .write = vfio_pci_write,
1182 .mmap = vfio_pci_mmap,
1183 .request = vfio_pci_request,
1184 };
1185
1186 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1187 {
1188 struct vfio_pci_device *vdev;
1189 struct iommu_group *group;
1190 int ret;
1191
1192 if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
1193 return -EINVAL;
1194
1195 /*
1196 * Prevent binding to PFs with VFs enabled, this too easily allows
1197 * userspace instance with VFs and PFs from the same device, which
1198 * cannot work. Disabling SR-IOV here would initiate removing the
1199 * VFs, which would unbind the driver, which is prone to blocking
1200 * if that VF is also in use by vfio-pci. Just reject these PFs
1201 * and let the user sort it out.
1202 */
1203 if (pci_num_vf(pdev)) {
1204 pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n");
1205 return -EBUSY;
1206 }
1207
1208 group = vfio_iommu_group_get(&pdev->dev);
1209 if (!group)
1210 return -EINVAL;
1211
1212 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
1213 if (!vdev) {
1214 vfio_iommu_group_put(group, &pdev->dev);
1215 return -ENOMEM;
1216 }
1217
1218 vdev->pdev = pdev;
1219 vdev->irq_type = VFIO_PCI_NUM_IRQS;
1220 mutex_init(&vdev->igate);
1221 spin_lock_init(&vdev->irqlock);
1222 mutex_init(&vdev->ioeventfds_lock);
1223 INIT_LIST_HEAD(&vdev->ioeventfds_list);
1224
1225 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
1226 if (ret) {
1227 vfio_iommu_group_put(group, &pdev->dev);
1228 kfree(vdev);
1229 return ret;
1230 }
1231
1232 if (vfio_pci_is_vga(pdev)) {
1233 vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode);
1234 vga_set_legacy_decoding(pdev,
1235 vfio_pci_set_vga_decode(vdev, false));
1236 }
1237
1238 if (!disable_idle_d3) {
1239 /*
1240 * pci-core sets the device power state to an unknown value at
1241 * bootup and after being removed from a driver. The only
1242 * transition it allows from this unknown state is to D0, which
1243 * typically happens when a driver calls pci_enable_device().
1244 * We're not ready to enable the device yet, but we do want to
1245 * be able to get to D3. Therefore first do a D0 transition
1246 * before going to D3.
1247 */
1248 pci_set_power_state(pdev, PCI_D0);
1249 pci_set_power_state(pdev, PCI_D3hot);
1250 }
1251
1252 return ret;
1253 }
1254
1255 static void vfio_pci_remove(struct pci_dev *pdev)
1256 {
1257 struct vfio_pci_device *vdev;
1258
1259 vdev = vfio_del_group_dev(&pdev->dev);
1260 if (!vdev)
1261 return;
1262
1263 vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev);
1264 kfree(vdev->region);
1265 mutex_destroy(&vdev->ioeventfds_lock);
1266 kfree(vdev);
1267
1268 if (vfio_pci_is_vga(pdev)) {
1269 vga_client_register(pdev, NULL, NULL, NULL);
1270 vga_set_legacy_decoding(pdev,
1271 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
1272 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
1273 }
1274
1275 if (!disable_idle_d3)
1276 pci_set_power_state(pdev, PCI_D0);
1277 }
1278
1279 static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
1280 pci_channel_state_t state)
1281 {
1282 struct vfio_pci_device *vdev;
1283 struct vfio_device *device;
1284
1285 device = vfio_device_get_from_dev(&pdev->dev);
1286 if (device == NULL)
1287 return PCI_ERS_RESULT_DISCONNECT;
1288
1289 vdev = vfio_device_data(device);
1290 if (vdev == NULL) {
1291 vfio_device_put(device);
1292 return PCI_ERS_RESULT_DISCONNECT;
1293 }
1294
1295 mutex_lock(&vdev->igate);
1296
1297 if (vdev->err_trigger)
1298 eventfd_signal(vdev->err_trigger, 1);
1299
1300 mutex_unlock(&vdev->igate);
1301
1302 vfio_device_put(device);
1303
1304 return PCI_ERS_RESULT_CAN_RECOVER;
1305 }
1306
1307 static const struct pci_error_handlers vfio_err_handlers = {
1308 .error_detected = vfio_pci_aer_err_detected,
1309 };
1310
1311 static struct pci_driver vfio_pci_driver = {
1312 .name = "vfio-pci",
1313 .id_table = NULL, /* only dynamic ids */
1314 .probe = vfio_pci_probe,
1315 .remove = vfio_pci_remove,
1316 .err_handler = &vfio_err_handlers,
1317 };
1318
1319 struct vfio_devices {
1320 struct vfio_device **devices;
1321 int cur_index;
1322 int max_index;
1323 };
1324
1325 static int vfio_pci_get_devs(struct pci_dev *pdev, void *data)
1326 {
1327 struct vfio_devices *devs = data;
1328 struct vfio_device *device;
1329
1330 if (devs->cur_index == devs->max_index)
1331 return -ENOSPC;
1332
1333 device = vfio_device_get_from_dev(&pdev->dev);
1334 if (!device)
1335 return -EINVAL;
1336
1337 if (pci_dev_driver(pdev) != &vfio_pci_driver) {
1338 vfio_device_put(device);
1339 return -EBUSY;
1340 }
1341
1342 devs->devices[devs->cur_index++] = device;
1343 return 0;
1344 }
1345
1346 /*
1347 * Attempt to do a bus/slot reset if there are devices affected by a reset for
1348 * this device that are needs_reset and all of the affected devices are unused
1349 * (!refcnt). Callers are required to hold driver_lock when calling this to
1350 * prevent device opens and concurrent bus reset attempts. We prevent device
1351 * unbinds by acquiring and holding a reference to the vfio_device.
1352 *
1353 * NB: vfio-core considers a group to be viable even if some devices are
1354 * bound to drivers like pci-stub or pcieport. Here we require all devices
1355 * to be bound to vfio_pci since that's the only way we can be sure they
1356 * stay put.
1357 */
1358 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
1359 {
1360 struct vfio_devices devs = { .cur_index = 0 };
1361 int i = 0, ret = -EINVAL;
1362 bool needs_reset = false, slot = false;
1363 struct vfio_pci_device *tmp;
1364
1365 if (!pci_probe_reset_slot(vdev->pdev->slot))
1366 slot = true;
1367 else if (pci_probe_reset_bus(vdev->pdev->bus))
1368 return;
1369
1370 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs,
1371 &i, slot) || !i)
1372 return;
1373
1374 devs.max_index = i;
1375 devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL);
1376 if (!devs.devices)
1377 return;
1378
1379 if (vfio_pci_for_each_slot_or_bus(vdev->pdev,
1380 vfio_pci_get_devs, &devs, slot))
1381 goto put_devs;
1382
1383 for (i = 0; i < devs.cur_index; i++) {
1384 tmp = vfio_device_data(devs.devices[i]);
1385 if (tmp->needs_reset)
1386 needs_reset = true;
1387 if (tmp->refcnt)
1388 goto put_devs;
1389 }
1390
1391 if (needs_reset)
1392 ret = pci_reset_bus(vdev->pdev);
1393
1394 put_devs:
1395 for (i = 0; i < devs.cur_index; i++) {
1396 tmp = vfio_device_data(devs.devices[i]);
1397 if (!ret)
1398 tmp->needs_reset = false;
1399
1400 if (!tmp->refcnt && !disable_idle_d3)
1401 pci_set_power_state(tmp->pdev, PCI_D3hot);
1402
1403 vfio_device_put(devs.devices[i]);
1404 }
1405
1406 kfree(devs.devices);
1407 }
1408
1409 static void __exit vfio_pci_cleanup(void)
1410 {
1411 pci_unregister_driver(&vfio_pci_driver);
1412 vfio_pci_uninit_perm_bits();
1413 }
1414
1415 static void __init vfio_pci_fill_ids(void)
1416 {
1417 char *p, *id;
1418 int rc;
1419
1420 /* no ids passed actually */
1421 if (ids[0] == '\0')
1422 return;
1423
1424 /* add ids specified in the module parameter */
1425 p = ids;
1426 while ((id = strsep(&p, ","))) {
1427 unsigned int vendor, device, subvendor = PCI_ANY_ID,
1428 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
1429 int fields;
1430
1431 if (!strlen(id))
1432 continue;
1433
1434 fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
1435 &vendor, &device, &subvendor, &subdevice,
1436 &class, &class_mask);
1437
1438 if (fields < 2) {
1439 pr_warn("invalid id string \"%s\"\n", id);
1440 continue;
1441 }
1442
1443 rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
1444 subvendor, subdevice, class, class_mask, 0);
1445 if (rc)
1446 pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
1447 vendor, device, subvendor, subdevice,
1448 class, class_mask, rc);
1449 else
1450 pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
1451 vendor, device, subvendor, subdevice,
1452 class, class_mask);
1453 }
1454 }
1455
1456 static int __init vfio_pci_init(void)
1457 {
1458 int ret;
1459
1460 /* Allocate shared config space permision data used by all devices */
1461 ret = vfio_pci_init_perm_bits();
1462 if (ret)
1463 return ret;
1464
1465 /* Register and scan for devices */
1466 ret = pci_register_driver(&vfio_pci_driver);
1467 if (ret)
1468 goto out_driver;
1469
1470 vfio_pci_fill_ids();
1471
1472 return 0;
1473
1474 out_driver:
1475 vfio_pci_uninit_perm_bits();
1476 return ret;
1477 }
1478
1479 module_init(vfio_pci_init);
1480 module_exit(vfio_pci_cleanup);
1481
1482 MODULE_VERSION(DRIVER_VERSION);
1483 MODULE_LICENSE("GPL v2");
1484 MODULE_AUTHOR(DRIVER_AUTHOR);
1485 MODULE_DESCRIPTION(DRIVER_DESC);
Linux with added FPC-III support