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dm writecache: add cond_resched to loop in persistent_memory_claim()
[linux/fpc-iii.git] / drivers / vfio / pci / vfio_pci.c
blob6c6b37b5c04e008967267893ba4f2e579b1d9b8f
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
4 * Author: Alex Williamson <alex.williamson@redhat.com>
5 *
6 * Derived from original vfio:
7 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
8 * Author: Tom Lyon, pugs@cisco.com
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/device.h>
14 #include <linux/eventfd.h>
15 #include <linux/file.h>
16 #include <linux/interrupt.h>
17 #include <linux/iommu.h>
18 #include <linux/module.h>
19 #include <linux/mutex.h>
20 #include <linux/notifier.h>
21 #include <linux/pci.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/slab.h>
24 #include <linux/types.h>
25 #include <linux/uaccess.h>
26 #include <linux/vfio.h>
27 #include <linux/vgaarb.h>
28 #include <linux/nospec.h>
29
30 #include "vfio_pci_private.h"
31
32 #define DRIVER_VERSION "0.2"
33 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
34 #define DRIVER_DESC "VFIO PCI - User Level meta-driver"
35
36 static char ids[1024] __initdata;
37 module_param_string(ids, ids, sizeof(ids), 0);
38 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");
39
40 static bool nointxmask;
41 module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
42 MODULE_PARM_DESC(nointxmask,
43 "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.");
44
45 #ifdef CONFIG_VFIO_PCI_VGA
46 static bool disable_vga;
47 module_param(disable_vga, bool, S_IRUGO);
48 MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci");
49 #endif
50
51 static bool disable_idle_d3;
52 module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
53 MODULE_PARM_DESC(disable_idle_d3,
54 "Disable using the PCI D3 low power state for idle, unused devices");
55
56 static bool enable_sriov;
57 #ifdef CONFIG_PCI_IOV
58 module_param(enable_sriov, bool, 0644);
59 MODULE_PARM_DESC(enable_sriov, "Enable support for SR-IOV configuration. Enabling SR-IOV on a PF typically requires support of the userspace PF driver, enabling VFs without such support may result in non-functional VFs or PF.");
60 #endif
61
62 static inline bool vfio_vga_disabled(void)
63 {
64 #ifdef CONFIG_VFIO_PCI_VGA
65 return disable_vga;
66 #else
67 return true;
68 #endif
69 }
70
71 /*
72 * Our VGA arbiter participation is limited since we don't know anything
73 * about the device itself. However, if the device is the only VGA device
74 * downstream of a bridge and VFIO VGA support is disabled, then we can
75 * safely return legacy VGA IO and memory as not decoded since the user
76 * has no way to get to it and routing can be disabled externally at the
77 * bridge.
78 */
79 static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga)
80 {
81 struct vfio_pci_device *vdev = opaque;
82 struct pci_dev *tmp = NULL, *pdev = vdev->pdev;
83 unsigned char max_busnr;
84 unsigned int decodes;
85
86 if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
87 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
88 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
89
90 max_busnr = pci_bus_max_busnr(pdev->bus);
91 decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
92
93 while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
94 if (tmp == pdev ||
95 pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
96 pci_is_root_bus(tmp->bus))
97 continue;
98
99 if (tmp->bus->number >= pdev->bus->number &&
100 tmp->bus->number <= max_busnr) {
101 pci_dev_put(tmp);
102 decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
103 break;
104 }
105 }
106
107 return decodes;
108 }
109
110 static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
111 {
112 return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
113 }
114
115 static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
116 {
117 struct resource *res;
118 int i;
119 struct vfio_pci_dummy_resource *dummy_res;
120
121 INIT_LIST_HEAD(&vdev->dummy_resources_list);
122
123 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
124 int bar = i + PCI_STD_RESOURCES;
125
126 res = &vdev->pdev->resource[bar];
127
128 if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
129 goto no_mmap;
130
131 if (!(res->flags & IORESOURCE_MEM))
132 goto no_mmap;
133
134 /*
135 * The PCI core shouldn't set up a resource with a
136 * type but zero size. But there may be bugs that
137 * cause us to do that.
138 */
139 if (!resource_size(res))
140 goto no_mmap;
141
142 if (resource_size(res) >= PAGE_SIZE) {
143 vdev->bar_mmap_supported[bar] = true;
144 continue;
145 }
146
147 if (!(res->start & ~PAGE_MASK)) {
148 /*
149 * Add a dummy resource to reserve the remainder
150 * of the exclusive page in case that hot-add
151 * device's bar is assigned into it.
152 */
153 dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL);
154 if (dummy_res == NULL)
155 goto no_mmap;
156
157 dummy_res->resource.name = "vfio sub-page reserved";
158 dummy_res->resource.start = res->end + 1;
159 dummy_res->resource.end = res->start + PAGE_SIZE - 1;
160 dummy_res->resource.flags = res->flags;
161 if (request_resource(res->parent,
162 &dummy_res->resource)) {
163 kfree(dummy_res);
164 goto no_mmap;
165 }
166 dummy_res->index = bar;
167 list_add(&dummy_res->res_next,
168 &vdev->dummy_resources_list);
169 vdev->bar_mmap_supported[bar] = true;
170 continue;
171 }
172 /*
173 * Here we don't handle the case when the BAR is not page
174 * aligned because we can't expect the BAR will be
175 * assigned into the same location in a page in guest
176 * when we passthrough the BAR. And it's hard to access
177 * this BAR in userspace because we have no way to get
178 * the BAR's location in a page.
179 */
180 no_mmap:
181 vdev->bar_mmap_supported[bar] = false;
182 }
183 }
184
185 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
186 static void vfio_pci_disable(struct vfio_pci_device *vdev);
187
188 /*
189 * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
190 * _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
191 * If a device implements the former but not the latter we would typically
192 * expect broken_intx_masking be set and require an exclusive interrupt.
193 * However since we do have control of the device's ability to assert INTx,
194 * we can instead pretend that the device does not implement INTx, virtualizing
195 * the pin register to report zero and maintaining DisINTx set on the host.
196 */
197 static bool vfio_pci_nointx(struct pci_dev *pdev)
198 {
199 switch (pdev->vendor) {
200 case PCI_VENDOR_ID_INTEL:
201 switch (pdev->device) {
202 /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */
203 case 0x1572:
204 case 0x1574:
205 case 0x1580 ... 0x1581:
206 case 0x1583 ... 0x158b:
207 case 0x37d0 ... 0x37d2:
208 return true;
209 default:
210 return false;
211 }
212 }
213
214 return false;
215 }
216
217 static void vfio_pci_probe_power_state(struct vfio_pci_device *vdev)
218 {
219 struct pci_dev *pdev = vdev->pdev;
220 u16 pmcsr;
221
222 if (!pdev->pm_cap)
223 return;
224
225 pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &pmcsr);
226
227 vdev->needs_pm_restore = !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET);
228 }
229
230 /*
231 * pci_set_power_state() wrapper handling devices which perform a soft reset on
232 * D3->D0 transition. Save state prior to D0/1/2->D3, stash it on the vdev,
233 * restore when returned to D0. Saved separately from pci_saved_state for use
234 * by PM capability emulation and separately from pci_dev internal saved state
235 * to avoid it being overwritten and consumed around other resets.
236 */
237 int vfio_pci_set_power_state(struct vfio_pci_device *vdev, pci_power_t state)
238 {
239 struct pci_dev *pdev = vdev->pdev;
240 bool needs_restore = false, needs_save = false;
241 int ret;
242
243 if (vdev->needs_pm_restore) {
244 if (pdev->current_state < PCI_D3hot && state >= PCI_D3hot) {
245 pci_save_state(pdev);
246 needs_save = true;
247 }
248
249 if (pdev->current_state >= PCI_D3hot && state <= PCI_D0)
250 needs_restore = true;
251 }
252
253 ret = pci_set_power_state(pdev, state);
254
255 if (!ret) {
256 /* D3 might be unsupported via quirk, skip unless in D3 */
257 if (needs_save && pdev->current_state >= PCI_D3hot) {
258 vdev->pm_save = pci_store_saved_state(pdev);
259 } else if (needs_restore) {
260 pci_load_and_free_saved_state(pdev, &vdev->pm_save);
261 pci_restore_state(pdev);
262 }
263 }
264
265 return ret;
266 }
267
268 static int vfio_pci_enable(struct vfio_pci_device *vdev)
269 {
270 struct pci_dev *pdev = vdev->pdev;
271 int ret;
272 u16 cmd;
273 u8 msix_pos;
274
275 vfio_pci_set_power_state(vdev, PCI_D0);
276
277 /* Don't allow our initial saved state to include busmaster */
278 pci_clear_master(pdev);
279
280 ret = pci_enable_device(pdev);
281 if (ret)
282 return ret;
283
284 /* If reset fails because of the device lock, fail this path entirely */
285 ret = pci_try_reset_function(pdev);
286 if (ret == -EAGAIN) {
287 pci_disable_device(pdev);
288 return ret;
289 }
290
291 vdev->reset_works = !ret;
292 pci_save_state(pdev);
293 vdev->pci_saved_state = pci_store_saved_state(pdev);
294 if (!vdev->pci_saved_state)
295 pci_dbg(pdev, "%s: Couldn't store saved state\n", __func__);
296
297 if (likely(!nointxmask)) {
298 if (vfio_pci_nointx(pdev)) {
299 pci_info(pdev, "Masking broken INTx support\n");
300 vdev->nointx = true;
301 pci_intx(pdev, 0);
302 } else
303 vdev->pci_2_3 = pci_intx_mask_supported(pdev);
304 }
305
306 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
307 if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
308 cmd &= ~PCI_COMMAND_INTX_DISABLE;
309 pci_write_config_word(pdev, PCI_COMMAND, cmd);
310 }
311
312 ret = vfio_config_init(vdev);
313 if (ret) {
314 kfree(vdev->pci_saved_state);
315 vdev->pci_saved_state = NULL;
316 pci_disable_device(pdev);
317 return ret;
318 }
319
320 msix_pos = pdev->msix_cap;
321 if (msix_pos) {
322 u16 flags;
323 u32 table;
324
325 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
326 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
327
328 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
329 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
330 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
331 } else
332 vdev->msix_bar = 0xFF;
333
334 if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
335 vdev->has_vga = true;
336
337
338 if (vfio_pci_is_vga(pdev) &&
339 pdev->vendor == PCI_VENDOR_ID_INTEL &&
340 IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
341 ret = vfio_pci_igd_init(vdev);
342 if (ret) {
343 pci_warn(pdev, "Failed to setup Intel IGD regions\n");
344 goto disable_exit;
345 }
346 }
347
348 if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
349 IS_ENABLED(CONFIG_VFIO_PCI_NVLINK2)) {
350 ret = vfio_pci_nvdia_v100_nvlink2_init(vdev);
351 if (ret && ret != -ENODEV) {
352 pci_warn(pdev, "Failed to setup NVIDIA NV2 RAM region\n");
353 goto disable_exit;
354 }
355 }
356
357 if (pdev->vendor == PCI_VENDOR_ID_IBM &&
358 IS_ENABLED(CONFIG_VFIO_PCI_NVLINK2)) {
359 ret = vfio_pci_ibm_npu2_init(vdev);
360 if (ret && ret != -ENODEV) {
361 pci_warn(pdev, "Failed to setup NVIDIA NV2 ATSD region\n");
362 goto disable_exit;
363 }
364 }
365
366 vfio_pci_probe_mmaps(vdev);
367
368 return 0;
369
370 disable_exit:
371 vfio_pci_disable(vdev);
372 return ret;
373 }
374
375 static void vfio_pci_disable(struct vfio_pci_device *vdev)
376 {
377 struct pci_dev *pdev = vdev->pdev;
378 struct vfio_pci_dummy_resource *dummy_res, *tmp;
379 struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp;
380 int i, bar;
381
382 /* Stop the device from further DMA */
383 pci_clear_master(pdev);
384
385 vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
386 VFIO_IRQ_SET_ACTION_TRIGGER,
387 vdev->irq_type, 0, 0, NULL);
388
389 /* Device closed, don't need mutex here */
390 list_for_each_entry_safe(ioeventfd, ioeventfd_tmp,
391 &vdev->ioeventfds_list, next) {
392 vfio_virqfd_disable(&ioeventfd->virqfd);
393 list_del(&ioeventfd->next);
394 kfree(ioeventfd);
395 }
396 vdev->ioeventfds_nr = 0;
397
398 vdev->virq_disabled = false;
399
400 for (i = 0; i < vdev->num_regions; i++)
401 vdev->region[i].ops->release(vdev, &vdev->region[i]);
402
403 vdev->num_regions = 0;
404 kfree(vdev->region);
405 vdev->region = NULL; /* don't krealloc a freed pointer */
406
407 vfio_config_free(vdev);
408
409 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
410 bar = i + PCI_STD_RESOURCES;
411 if (!vdev->barmap[bar])
412 continue;
413 pci_iounmap(pdev, vdev->barmap[bar]);
414 pci_release_selected_regions(pdev, 1 << bar);
415 vdev->barmap[bar] = NULL;
416 }
417
418 list_for_each_entry_safe(dummy_res, tmp,
419 &vdev->dummy_resources_list, res_next) {
420 list_del(&dummy_res->res_next);
421 release_resource(&dummy_res->resource);
422 kfree(dummy_res);
423 }
424
425 vdev->needs_reset = true;
426
427 /*
428 * If we have saved state, restore it. If we can reset the device,
429 * even better. Resetting with current state seems better than
430 * nothing, but saving and restoring current state without reset
431 * is just busy work.
432 */
433 if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
434 pci_info(pdev, "%s: Couldn't reload saved state\n", __func__);
435
436 if (!vdev->reset_works)
437 goto out;
438
439 pci_save_state(pdev);
440 }
441
442 /*
443 * Disable INTx and MSI, presumably to avoid spurious interrupts
444 * during reset. Stolen from pci_reset_function()
445 */
446 pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
447
448 /*
449 * Try to get the locks ourselves to prevent a deadlock. The
450 * success of this is dependent on being able to lock the device,
451 * which is not always possible.
452 * We can not use the "try" reset interface here, which will
453 * overwrite the previously restored configuration information.
454 */
455 if (vdev->reset_works && pci_cfg_access_trylock(pdev)) {
456 if (device_trylock(&pdev->dev)) {
457 if (!__pci_reset_function_locked(pdev))
458 vdev->needs_reset = false;
459 device_unlock(&pdev->dev);
460 }
461 pci_cfg_access_unlock(pdev);
462 }
463
464 pci_restore_state(pdev);
465 out:
466 pci_disable_device(pdev);
467
468 vfio_pci_try_bus_reset(vdev);
469
470 if (!disable_idle_d3)
471 vfio_pci_set_power_state(vdev, PCI_D3hot);
472 }
473
474 static struct pci_driver vfio_pci_driver;
475
476 static struct vfio_pci_device *get_pf_vdev(struct vfio_pci_device *vdev,
477 struct vfio_device **pf_dev)
478 {
479 struct pci_dev *physfn = pci_physfn(vdev->pdev);
480
481 if (!vdev->pdev->is_virtfn)
482 return NULL;
483
484 *pf_dev = vfio_device_get_from_dev(&physfn->dev);
485 if (!*pf_dev)
486 return NULL;
487
488 if (pci_dev_driver(physfn) != &vfio_pci_driver) {
489 vfio_device_put(*pf_dev);
490 return NULL;
491 }
492
493 return vfio_device_data(*pf_dev);
494 }
495
496 static void vfio_pci_vf_token_user_add(struct vfio_pci_device *vdev, int val)
497 {
498 struct vfio_device *pf_dev;
499 struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev, &pf_dev);
500
501 if (!pf_vdev)
502 return;
503
504 mutex_lock(&pf_vdev->vf_token->lock);
505 pf_vdev->vf_token->users += val;
506 WARN_ON(pf_vdev->vf_token->users < 0);
507 mutex_unlock(&pf_vdev->vf_token->lock);
508
509 vfio_device_put(pf_dev);
510 }
511
512 static void vfio_pci_release(void *device_data)
513 {
514 struct vfio_pci_device *vdev = device_data;
515
516 mutex_lock(&vdev->reflck->lock);
517
518 if (!(--vdev->refcnt)) {
519 vfio_pci_vf_token_user_add(vdev, -1);
520 vfio_spapr_pci_eeh_release(vdev->pdev);
521 vfio_pci_disable(vdev);
522 }
523
524 mutex_unlock(&vdev->reflck->lock);
525
526 module_put(THIS_MODULE);
527 }
528
529 static int vfio_pci_open(void *device_data)
530 {
531 struct vfio_pci_device *vdev = device_data;
532 int ret = 0;
533
534 if (!try_module_get(THIS_MODULE))
535 return -ENODEV;
536
537 mutex_lock(&vdev->reflck->lock);
538
539 if (!vdev->refcnt) {
540 ret = vfio_pci_enable(vdev);
541 if (ret)
542 goto error;
543
544 vfio_spapr_pci_eeh_open(vdev->pdev);
545 vfio_pci_vf_token_user_add(vdev, 1);
546 }
547 vdev->refcnt++;
548 error:
549 mutex_unlock(&vdev->reflck->lock);
550 if (ret)
551 module_put(THIS_MODULE);
552 return ret;
553 }
554
555 static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
556 {
557 if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
558 u8 pin;
559
560 if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) ||
561 vdev->nointx || vdev->pdev->is_virtfn)
562 return 0;
563
564 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
565
566 return pin ? 1 : 0;
567 } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
568 u8 pos;
569 u16 flags;
570
571 pos = vdev->pdev->msi_cap;
572 if (pos) {
573 pci_read_config_word(vdev->pdev,
574 pos + PCI_MSI_FLAGS, &flags);
575 return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
576 }
577 } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
578 u8 pos;
579 u16 flags;
580
581 pos = vdev->pdev->msix_cap;
582 if (pos) {
583 pci_read_config_word(vdev->pdev,
584 pos + PCI_MSIX_FLAGS, &flags);
585
586 return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
587 }
588 } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
589 if (pci_is_pcie(vdev->pdev))
590 return 1;
591 } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
592 return 1;
593 }
594
595 return 0;
596 }
597
598 static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
599 {
600 (*(int *)data)++;
601 return 0;
602 }
603
604 struct vfio_pci_fill_info {
605 int max;
606 int cur;
607 struct vfio_pci_dependent_device *devices;
608 };
609
610 static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
611 {
612 struct vfio_pci_fill_info *fill = data;
613 struct iommu_group *iommu_group;
614
615 if (fill->cur == fill->max)
616 return -EAGAIN; /* Something changed, try again */
617
618 iommu_group = iommu_group_get(&pdev->dev);
619 if (!iommu_group)
620 return -EPERM; /* Cannot reset non-isolated devices */
621
622 fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
623 fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
624 fill->devices[fill->cur].bus = pdev->bus->number;
625 fill->devices[fill->cur].devfn = pdev->devfn;
626 fill->cur++;
627 iommu_group_put(iommu_group);
628 return 0;
629 }
630
631 struct vfio_pci_group_entry {
632 struct vfio_group *group;
633 int id;
634 };
635
636 struct vfio_pci_group_info {
637 int count;
638 struct vfio_pci_group_entry *groups;
639 };
640
641 static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
642 {
643 struct vfio_pci_group_info *info = data;
644 struct iommu_group *group;
645 int id, i;
646
647 group = iommu_group_get(&pdev->dev);
648 if (!group)
649 return -EPERM;
650
651 id = iommu_group_id(group);
652
653 for (i = 0; i < info->count; i++)
654 if (info->groups[i].id == id)
655 break;
656
657 iommu_group_put(group);
658
659 return (i == info->count) ? -EINVAL : 0;
660 }
661
662 static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
663 {
664 for (; pdev; pdev = pdev->bus->self)
665 if (pdev->bus == slot->bus)
666 return (pdev->slot == slot);
667 return false;
668 }
669
670 struct vfio_pci_walk_info {
671 int (*fn)(struct pci_dev *, void *data);
672 void *data;
673 struct pci_dev *pdev;
674 bool slot;
675 int ret;
676 };
677
678 static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
679 {
680 struct vfio_pci_walk_info *walk = data;
681
682 if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
683 walk->ret = walk->fn(pdev, walk->data);
684
685 return walk->ret;
686 }
687
688 static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
689 int (*fn)(struct pci_dev *,
690 void *data), void *data,
691 bool slot)
692 {
693 struct vfio_pci_walk_info walk = {
694 .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
695 };
696
697 pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
698
699 return walk.ret;
700 }
701
702 static int msix_mmappable_cap(struct vfio_pci_device *vdev,
703 struct vfio_info_cap *caps)
704 {
705 struct vfio_info_cap_header header = {
706 .id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE,
707 .version = 1
708 };
709
710 return vfio_info_add_capability(caps, &header, sizeof(header));
711 }
712
713 int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
714 unsigned int type, unsigned int subtype,
715 const struct vfio_pci_regops *ops,
716 size_t size, u32 flags, void *data)
717 {
718 struct vfio_pci_region *region;
719
720 region = krealloc(vdev->region,
721 (vdev->num_regions + 1) * sizeof(*region),
722 GFP_KERNEL);
723 if (!region)
724 return -ENOMEM;
725
726 vdev->region = region;
727 vdev->region[vdev->num_regions].type = type;
728 vdev->region[vdev->num_regions].subtype = subtype;
729 vdev->region[vdev->num_regions].ops = ops;
730 vdev->region[vdev->num_regions].size = size;
731 vdev->region[vdev->num_regions].flags = flags;
732 vdev->region[vdev->num_regions].data = data;
733
734 vdev->num_regions++;
735
736 return 0;
737 }
738
739 static long vfio_pci_ioctl(void *device_data,
740 unsigned int cmd, unsigned long arg)
741 {
742 struct vfio_pci_device *vdev = device_data;
743 unsigned long minsz;
744
745 if (cmd == VFIO_DEVICE_GET_INFO) {
746 struct vfio_device_info info;
747
748 minsz = offsetofend(struct vfio_device_info, num_irqs);
749
750 if (copy_from_user(&info, (void __user *)arg, minsz))
751 return -EFAULT;
752
753 if (info.argsz < minsz)
754 return -EINVAL;
755
756 info.flags = VFIO_DEVICE_FLAGS_PCI;
757
758 if (vdev->reset_works)
759 info.flags |= VFIO_DEVICE_FLAGS_RESET;
760
761 info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
762 info.num_irqs = VFIO_PCI_NUM_IRQS;
763
764 return copy_to_user((void __user *)arg, &info, minsz) ?
765 -EFAULT : 0;
766
767 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
768 struct pci_dev *pdev = vdev->pdev;
769 struct vfio_region_info info;
770 struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
771 int i, ret;
772
773 minsz = offsetofend(struct vfio_region_info, offset);
774
775 if (copy_from_user(&info, (void __user *)arg, minsz))
776 return -EFAULT;
777
778 if (info.argsz < minsz)
779 return -EINVAL;
780
781 switch (info.index) {
782 case VFIO_PCI_CONFIG_REGION_INDEX:
783 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
784 info.size = pdev->cfg_size;
785 info.flags = VFIO_REGION_INFO_FLAG_READ |
786 VFIO_REGION_INFO_FLAG_WRITE;
787 break;
788 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
789 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
790 info.size = pci_resource_len(pdev, info.index);
791 if (!info.size) {
792 info.flags = 0;
793 break;
794 }
795
796 info.flags = VFIO_REGION_INFO_FLAG_READ |
797 VFIO_REGION_INFO_FLAG_WRITE;
798 if (vdev->bar_mmap_supported[info.index]) {
799 info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
800 if (info.index == vdev->msix_bar) {
801 ret = msix_mmappable_cap(vdev, &caps);
802 if (ret)
803 return ret;
804 }
805 }
806
807 break;
808 case VFIO_PCI_ROM_REGION_INDEX:
809 {
810 void __iomem *io;
811 size_t size;
812 u16 orig_cmd;
813
814 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
815 info.flags = 0;
816
817 /* Report the BAR size, not the ROM size */
818 info.size = pci_resource_len(pdev, info.index);
819 if (!info.size) {
820 /* Shadow ROMs appear as PCI option ROMs */
821 if (pdev->resource[PCI_ROM_RESOURCE].flags &
822 IORESOURCE_ROM_SHADOW)
823 info.size = 0x20000;
824 else
825 break;
826 }
827
828 /*
829 * Is it really there? Enable memory decode for
830 * implicit access in pci_map_rom().
831 */
832 pci_read_config_word(pdev, PCI_COMMAND, &orig_cmd);
833 pci_write_config_word(pdev, PCI_COMMAND,
834 orig_cmd | PCI_COMMAND_MEMORY);
835
836 io = pci_map_rom(pdev, &size);
837 if (io) {
838 info.flags = VFIO_REGION_INFO_FLAG_READ;
839 pci_unmap_rom(pdev, io);
840 } else {
841 info.size = 0;
842 }
843
844 pci_write_config_word(pdev, PCI_COMMAND, orig_cmd);
845 break;
846 }
847 case VFIO_PCI_VGA_REGION_INDEX:
848 if (!vdev->has_vga)
849 return -EINVAL;
850
851 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
852 info.size = 0xc0000;
853 info.flags = VFIO_REGION_INFO_FLAG_READ |
854 VFIO_REGION_INFO_FLAG_WRITE;
855
856 break;
857 default:
858 {
859 struct vfio_region_info_cap_type cap_type = {
860 .header.id = VFIO_REGION_INFO_CAP_TYPE,
861 .header.version = 1 };
862
863 if (info.index >=
864 VFIO_PCI_NUM_REGIONS + vdev->num_regions)
865 return -EINVAL;
866 info.index = array_index_nospec(info.index,
867 VFIO_PCI_NUM_REGIONS +
868 vdev->num_regions);
869
870 i = info.index - VFIO_PCI_NUM_REGIONS;
871
872 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
873 info.size = vdev->region[i].size;
874 info.flags = vdev->region[i].flags;
875
876 cap_type.type = vdev->region[i].type;
877 cap_type.subtype = vdev->region[i].subtype;
878
879 ret = vfio_info_add_capability(&caps, &cap_type.header,
880 sizeof(cap_type));
881 if (ret)
882 return ret;
883
884 if (vdev->region[i].ops->add_capability) {
885 ret = vdev->region[i].ops->add_capability(vdev,
886 &vdev->region[i], &caps);
887 if (ret)
888 return ret;
889 }
890 }
891 }
892
893 if (caps.size) {
894 info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
895 if (info.argsz < sizeof(info) + caps.size) {
896 info.argsz = sizeof(info) + caps.size;
897 info.cap_offset = 0;
898 } else {
899 vfio_info_cap_shift(&caps, sizeof(info));
900 if (copy_to_user((void __user *)arg +
901 sizeof(info), caps.buf,
902 caps.size)) {
903 kfree(caps.buf);
904 return -EFAULT;
905 }
906 info.cap_offset = sizeof(info);
907 }
908
909 kfree(caps.buf);
910 }
911
912 return copy_to_user((void __user *)arg, &info, minsz) ?
913 -EFAULT : 0;
914
915 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
916 struct vfio_irq_info info;
917
918 minsz = offsetofend(struct vfio_irq_info, count);
919
920 if (copy_from_user(&info, (void __user *)arg, minsz))
921 return -EFAULT;
922
923 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
924 return -EINVAL;
925
926 switch (info.index) {
927 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
928 case VFIO_PCI_REQ_IRQ_INDEX:
929 break;
930 case VFIO_PCI_ERR_IRQ_INDEX:
931 if (pci_is_pcie(vdev->pdev))
932 break;
933 /* fall through */
934 default:
935 return -EINVAL;
936 }
937
938 info.flags = VFIO_IRQ_INFO_EVENTFD;
939
940 info.count = vfio_pci_get_irq_count(vdev, info.index);
941
942 if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
943 info.flags |= (VFIO_IRQ_INFO_MASKABLE |
944 VFIO_IRQ_INFO_AUTOMASKED);
945 else
946 info.flags |= VFIO_IRQ_INFO_NORESIZE;
947
948 return copy_to_user((void __user *)arg, &info, minsz) ?
949 -EFAULT : 0;
950
951 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
952 struct vfio_irq_set hdr;
953 u8 *data = NULL;
954 int max, ret = 0;
955 size_t data_size = 0;
956
957 minsz = offsetofend(struct vfio_irq_set, count);
958
959 if (copy_from_user(&hdr, (void __user *)arg, minsz))
960 return -EFAULT;
961
962 max = vfio_pci_get_irq_count(vdev, hdr.index);
963
964 ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
965 VFIO_PCI_NUM_IRQS, &data_size);
966 if (ret)
967 return ret;
968
969 if (data_size) {
970 data = memdup_user((void __user *)(arg + minsz),
971 data_size);
972 if (IS_ERR(data))
973 return PTR_ERR(data);
974 }
975
976 mutex_lock(&vdev->igate);
977
978 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
979 hdr.start, hdr.count, data);
980
981 mutex_unlock(&vdev->igate);
982 kfree(data);
983
984 return ret;
985
986 } else if (cmd == VFIO_DEVICE_RESET) {
987 return vdev->reset_works ?
988 pci_try_reset_function(vdev->pdev) : -EINVAL;
989
990 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
991 struct vfio_pci_hot_reset_info hdr;
992 struct vfio_pci_fill_info fill = { 0 };
993 struct vfio_pci_dependent_device *devices = NULL;
994 bool slot = false;
995 int ret = 0;
996
997 minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
998
999 if (copy_from_user(&hdr, (void __user *)arg, minsz))
1000 return -EFAULT;
1001
1002 if (hdr.argsz < minsz)
1003 return -EINVAL;
1004
1005 hdr.flags = 0;
1006
1007 /* Can we do a slot or bus reset or neither? */
1008 if (!pci_probe_reset_slot(vdev->pdev->slot))
1009 slot = true;
1010 else if (pci_probe_reset_bus(vdev->pdev->bus))
1011 return -ENODEV;
1012
1013 /* How many devices are affected? */
1014 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
1015 vfio_pci_count_devs,
1016 &fill.max, slot);
1017 if (ret)
1018 return ret;
1019
1020 WARN_ON(!fill.max); /* Should always be at least one */
1021
1022 /*
1023 * If there's enough space, fill it now, otherwise return
1024 * -ENOSPC and the number of devices affected.
1025 */
1026 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
1027 ret = -ENOSPC;
1028 hdr.count = fill.max;
1029 goto reset_info_exit;
1030 }
1031
1032 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
1033 if (!devices)
1034 return -ENOMEM;
1035
1036 fill.devices = devices;
1037
1038 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
1039 vfio_pci_fill_devs,
1040 &fill, slot);
1041
1042 /*
1043 * If a device was removed between counting and filling,
1044 * we may come up short of fill.max. If a device was
1045 * added, we'll have a return of -EAGAIN above.
1046 */
1047 if (!ret)
1048 hdr.count = fill.cur;
1049
1050 reset_info_exit:
1051 if (copy_to_user((void __user *)arg, &hdr, minsz))
1052 ret = -EFAULT;
1053
1054 if (!ret) {
1055 if (copy_to_user((void __user *)(arg + minsz), devices,
1056 hdr.count * sizeof(*devices)))
1057 ret = -EFAULT;
1058 }
1059
1060 kfree(devices);
1061 return ret;
1062
1063 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
1064 struct vfio_pci_hot_reset hdr;
1065 int32_t *group_fds;
1066 struct vfio_pci_group_entry *groups;
1067 struct vfio_pci_group_info info;
1068 bool slot = false;
1069 int i, count = 0, ret = 0;
1070
1071 minsz = offsetofend(struct vfio_pci_hot_reset, count);
1072
1073 if (copy_from_user(&hdr, (void __user *)arg, minsz))
1074 return -EFAULT;
1075
1076 if (hdr.argsz < minsz || hdr.flags)
1077 return -EINVAL;
1078
1079 /* Can we do a slot or bus reset or neither? */
1080 if (!pci_probe_reset_slot(vdev->pdev->slot))
1081 slot = true;
1082 else if (pci_probe_reset_bus(vdev->pdev->bus))
1083 return -ENODEV;
1084
1085 /*
1086 * We can't let userspace give us an arbitrarily large
1087 * buffer to copy, so verify how many we think there
1088 * could be. Note groups can have multiple devices so
1089 * one group per device is the max.
1090 */
1091 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
1092 vfio_pci_count_devs,
1093 &count, slot);
1094 if (ret)
1095 return ret;
1096
1097 /* Somewhere between 1 and count is OK */
1098 if (!hdr.count || hdr.count > count)
1099 return -EINVAL;
1100
1101 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
1102 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
1103 if (!group_fds || !groups) {
1104 kfree(group_fds);
1105 kfree(groups);
1106 return -ENOMEM;
1107 }
1108
1109 if (copy_from_user(group_fds, (void __user *)(arg + minsz),
1110 hdr.count * sizeof(*group_fds))) {
1111 kfree(group_fds);
1112 kfree(groups);
1113 return -EFAULT;
1114 }
1115
1116 /*
1117 * For each group_fd, get the group through the vfio external
1118 * user interface and store the group and iommu ID. This
1119 * ensures the group is held across the reset.
1120 */
1121 for (i = 0; i < hdr.count; i++) {
1122 struct vfio_group *group;
1123 struct fd f = fdget(group_fds[i]);
1124 if (!f.file) {
1125 ret = -EBADF;
1126 break;
1127 }
1128
1129 group = vfio_group_get_external_user(f.file);
1130 fdput(f);
1131 if (IS_ERR(group)) {
1132 ret = PTR_ERR(group);
1133 break;
1134 }
1135
1136 groups[i].group = group;
1137 groups[i].id = vfio_external_user_iommu_id(group);
1138 }
1139
1140 kfree(group_fds);
1141
1142 /* release reference to groups on error */
1143 if (ret)
1144 goto hot_reset_release;
1145
1146 info.count = hdr.count;
1147 info.groups = groups;
1148
1149 /*
1150 * Test whether all the affected devices are contained
1151 * by the set of groups provided by the user.
1152 */
1153 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
1154 vfio_pci_validate_devs,
1155 &info, slot);
1156 if (!ret)
1157 /* User has access, do the reset */
1158 ret = pci_reset_bus(vdev->pdev);
1159
1160 hot_reset_release:
1161 for (i--; i >= 0; i--)
1162 vfio_group_put_external_user(groups[i].group);
1163
1164 kfree(groups);
1165 return ret;
1166 } else if (cmd == VFIO_DEVICE_IOEVENTFD) {
1167 struct vfio_device_ioeventfd ioeventfd;
1168 int count;
1169
1170 minsz = offsetofend(struct vfio_device_ioeventfd, fd);
1171
1172 if (copy_from_user(&ioeventfd, (void __user *)arg, minsz))
1173 return -EFAULT;
1174
1175 if (ioeventfd.argsz < minsz)
1176 return -EINVAL;
1177
1178 if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK)
1179 return -EINVAL;
1180
1181 count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK;
1182
1183 if (hweight8(count) != 1 || ioeventfd.fd < -1)
1184 return -EINVAL;
1185
1186 return vfio_pci_ioeventfd(vdev, ioeventfd.offset,
1187 ioeventfd.data, count, ioeventfd.fd);
1188 } else if (cmd == VFIO_DEVICE_FEATURE) {
1189 struct vfio_device_feature feature;
1190 uuid_t uuid;
1191
1192 minsz = offsetofend(struct vfio_device_feature, flags);
1193
1194 if (copy_from_user(&feature, (void __user *)arg, minsz))
1195 return -EFAULT;
1196
1197 if (feature.argsz < minsz)
1198 return -EINVAL;
1199
1200 /* Check unknown flags */
1201 if (feature.flags & ~(VFIO_DEVICE_FEATURE_MASK |
1202 VFIO_DEVICE_FEATURE_SET |
1203 VFIO_DEVICE_FEATURE_GET |
1204 VFIO_DEVICE_FEATURE_PROBE))
1205 return -EINVAL;
1206
1207 /* GET & SET are mutually exclusive except with PROBE */
1208 if (!(feature.flags & VFIO_DEVICE_FEATURE_PROBE) &&
1209 (feature.flags & VFIO_DEVICE_FEATURE_SET) &&
1210 (feature.flags & VFIO_DEVICE_FEATURE_GET))
1211 return -EINVAL;
1212
1213 switch (feature.flags & VFIO_DEVICE_FEATURE_MASK) {
1214 case VFIO_DEVICE_FEATURE_PCI_VF_TOKEN:
1215 if (!vdev->vf_token)
1216 return -ENOTTY;
1217
1218 /*
1219 * We do not support GET of the VF Token UUID as this
1220 * could expose the token of the previous device user.
1221 */
1222 if (feature.flags & VFIO_DEVICE_FEATURE_GET)
1223 return -EINVAL;
1224
1225 if (feature.flags & VFIO_DEVICE_FEATURE_PROBE)
1226 return 0;
1227
1228 /* Don't SET unless told to do so */
1229 if (!(feature.flags & VFIO_DEVICE_FEATURE_SET))
1230 return -EINVAL;
1231
1232 if (feature.argsz < minsz + sizeof(uuid))
1233 return -EINVAL;
1234
1235 if (copy_from_user(&uuid, (void __user *)(arg + minsz),
1236 sizeof(uuid)))
1237 return -EFAULT;
1238
1239 mutex_lock(&vdev->vf_token->lock);
1240 uuid_copy(&vdev->vf_token->uuid, &uuid);
1241 mutex_unlock(&vdev->vf_token->lock);
1242
1243 return 0;
1244 default:
1245 return -ENOTTY;
1246 }
1247 }
1248
1249 return -ENOTTY;
1250 }
1251
1252 static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
1253 size_t count, loff_t *ppos, bool iswrite)
1254 {
1255 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
1256 struct vfio_pci_device *vdev = device_data;
1257
1258 if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
1259 return -EINVAL;
1260
1261 switch (index) {
1262 case VFIO_PCI_CONFIG_REGION_INDEX:
1263 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
1264
1265 case VFIO_PCI_ROM_REGION_INDEX:
1266 if (iswrite)
1267 return -EINVAL;
1268 return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
1269
1270 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
1271 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
1272
1273 case VFIO_PCI_VGA_REGION_INDEX:
1274 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
1275 default:
1276 index -= VFIO_PCI_NUM_REGIONS;
1277 return vdev->region[index].ops->rw(vdev, buf,
1278 count, ppos, iswrite);
1279 }
1280
1281 return -EINVAL;
1282 }
1283
1284 static ssize_t vfio_pci_read(void *device_data, char __user *buf,
1285 size_t count, loff_t *ppos)
1286 {
1287 if (!count)
1288 return 0;
1289
1290 return vfio_pci_rw(device_data, buf, count, ppos, false);
1291 }
1292
1293 static ssize_t vfio_pci_write(void *device_data, const char __user *buf,
1294 size_t count, loff_t *ppos)
1295 {
1296 if (!count)
1297 return 0;
1298
1299 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
1300 }
1301
1302 static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
1303 {
1304 struct vfio_pci_device *vdev = device_data;
1305 struct pci_dev *pdev = vdev->pdev;
1306 unsigned int index;
1307 u64 phys_len, req_len, pgoff, req_start;
1308 int ret;
1309
1310 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
1311
1312 if (vma->vm_end < vma->vm_start)
1313 return -EINVAL;
1314 if ((vma->vm_flags & VM_SHARED) == 0)
1315 return -EINVAL;
1316 if (index >= VFIO_PCI_NUM_REGIONS) {
1317 int regnum = index - VFIO_PCI_NUM_REGIONS;
1318 struct vfio_pci_region *region = vdev->region + regnum;
1319
1320 if (region && region->ops && region->ops->mmap &&
1321 (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
1322 return region->ops->mmap(vdev, region, vma);
1323 return -EINVAL;
1324 }
1325 if (index >= VFIO_PCI_ROM_REGION_INDEX)
1326 return -EINVAL;
1327 if (!vdev->bar_mmap_supported[index])
1328 return -EINVAL;
1329
1330 phys_len = PAGE_ALIGN(pci_resource_len(pdev, index));
1331 req_len = vma->vm_end - vma->vm_start;
1332 pgoff = vma->vm_pgoff &
1333 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
1334 req_start = pgoff << PAGE_SHIFT;
1335
1336 if (req_start + req_len > phys_len)
1337 return -EINVAL;
1338
1339 /*
1340 * Even though we don't make use of the barmap for the mmap,
1341 * we need to request the region and the barmap tracks that.
1342 */
1343 if (!vdev->barmap[index]) {
1344 ret = pci_request_selected_regions(pdev,
1345 1 << index, "vfio-pci");
1346 if (ret)
1347 return ret;
1348
1349 vdev->barmap[index] = pci_iomap(pdev, index, 0);
1350 if (!vdev->barmap[index]) {
1351 pci_release_selected_regions(pdev, 1 << index);
1352 return -ENOMEM;
1353 }
1354 }
1355
1356 vma->vm_private_data = vdev;
1357 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1358 vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
1359
1360 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
1361 req_len, vma->vm_page_prot);
1362 }
1363
1364 static void vfio_pci_request(void *device_data, unsigned int count)
1365 {
1366 struct vfio_pci_device *vdev = device_data;
1367 struct pci_dev *pdev = vdev->pdev;
1368
1369 mutex_lock(&vdev->igate);
1370
1371 if (vdev->req_trigger) {
1372 if (!(count % 10))
1373 pci_notice_ratelimited(pdev,
1374 "Relaying device request to user (#%u)\n",
1375 count);
1376 eventfd_signal(vdev->req_trigger, 1);
1377 } else if (count == 0) {
1378 pci_warn(pdev,
1379 "No device request channel registered, blocked until released by user\n");
1380 }
1381
1382 mutex_unlock(&vdev->igate);
1383 }
1384
1385 static int vfio_pci_validate_vf_token(struct vfio_pci_device *vdev,
1386 bool vf_token, uuid_t *uuid)
1387 {
1388 /*
1389 * There's always some degree of trust or collaboration between SR-IOV
1390 * PF and VFs, even if just that the PF hosts the SR-IOV capability and
1391 * can disrupt VFs with a reset, but often the PF has more explicit
1392 * access to deny service to the VF or access data passed through the
1393 * VF. We therefore require an opt-in via a shared VF token (UUID) to
1394 * represent this trust. This both prevents that a VF driver might
1395 * assume the PF driver is a trusted, in-kernel driver, and also that
1396 * a PF driver might be replaced with a rogue driver, unknown to in-use
1397 * VF drivers.
1398 *
1399 * Therefore when presented with a VF, if the PF is a vfio device and
1400 * it is bound to the vfio-pci driver, the user needs to provide a VF
1401 * token to access the device, in the form of appending a vf_token to
1402 * the device name, for example:
1403 *
1404 * "0000:04:10.0 vf_token=bd8d9d2b-5a5f-4f5a-a211-f591514ba1f3"
1405 *
1406 * When presented with a PF which has VFs in use, the user must also
1407 * provide the current VF token to prove collaboration with existing
1408 * VF users. If VFs are not in use, the VF token provided for the PF
1409 * device will act to set the VF token.
1410 *
1411 * If the VF token is provided but unused, an error is generated.
1412 */
1413 if (!vdev->pdev->is_virtfn && !vdev->vf_token && !vf_token)
1414 return 0; /* No VF token provided or required */
1415
1416 if (vdev->pdev->is_virtfn) {
1417 struct vfio_device *pf_dev;
1418 struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev, &pf_dev);
1419 bool match;
1420
1421 if (!pf_vdev) {
1422 if (!vf_token)
1423 return 0; /* PF is not vfio-pci, no VF token */
1424
1425 pci_info_ratelimited(vdev->pdev,
1426 "VF token incorrectly provided, PF not bound to vfio-pci\n");
1427 return -EINVAL;
1428 }
1429
1430 if (!vf_token) {
1431 vfio_device_put(pf_dev);
1432 pci_info_ratelimited(vdev->pdev,
1433 "VF token required to access device\n");
1434 return -EACCES;
1435 }
1436
1437 mutex_lock(&pf_vdev->vf_token->lock);
1438 match = uuid_equal(uuid, &pf_vdev->vf_token->uuid);
1439 mutex_unlock(&pf_vdev->vf_token->lock);
1440
1441 vfio_device_put(pf_dev);
1442
1443 if (!match) {
1444 pci_info_ratelimited(vdev->pdev,
1445 "Incorrect VF token provided for device\n");
1446 return -EACCES;
1447 }
1448 } else if (vdev->vf_token) {
1449 mutex_lock(&vdev->vf_token->lock);
1450 if (vdev->vf_token->users) {
1451 if (!vf_token) {
1452 mutex_unlock(&vdev->vf_token->lock);
1453 pci_info_ratelimited(vdev->pdev,
1454 "VF token required to access device\n");
1455 return -EACCES;
1456 }
1457
1458 if (!uuid_equal(uuid, &vdev->vf_token->uuid)) {
1459 mutex_unlock(&vdev->vf_token->lock);
1460 pci_info_ratelimited(vdev->pdev,
1461 "Incorrect VF token provided for device\n");
1462 return -EACCES;
1463 }
1464 } else if (vf_token) {
1465 uuid_copy(&vdev->vf_token->uuid, uuid);
1466 }
1467
1468 mutex_unlock(&vdev->vf_token->lock);
1469 } else if (vf_token) {
1470 pci_info_ratelimited(vdev->pdev,
1471 "VF token incorrectly provided, not a PF or VF\n");
1472 return -EINVAL;
1473 }
1474
1475 return 0;
1476 }
1477
1478 #define VF_TOKEN_ARG "vf_token="
1479
1480 static int vfio_pci_match(void *device_data, char *buf)
1481 {
1482 struct vfio_pci_device *vdev = device_data;
1483 bool vf_token = false;
1484 uuid_t uuid;
1485 int ret;
1486
1487 if (strncmp(pci_name(vdev->pdev), buf, strlen(pci_name(vdev->pdev))))
1488 return 0; /* No match */
1489
1490 if (strlen(buf) > strlen(pci_name(vdev->pdev))) {
1491 buf += strlen(pci_name(vdev->pdev));
1492
1493 if (*buf != ' ')
1494 return 0; /* No match: non-whitespace after name */
1495
1496 while (*buf) {
1497 if (*buf == ' ') {
1498 buf++;
1499 continue;
1500 }
1501
1502 if (!vf_token && !strncmp(buf, VF_TOKEN_ARG,
1503 strlen(VF_TOKEN_ARG))) {
1504 buf += strlen(VF_TOKEN_ARG);
1505
1506 if (strlen(buf) < UUID_STRING_LEN)
1507 return -EINVAL;
1508
1509 ret = uuid_parse(buf, &uuid);
1510 if (ret)
1511 return ret;
1512
1513 vf_token = true;
1514 buf += UUID_STRING_LEN;
1515 } else {
1516 /* Unknown/duplicate option */
1517 return -EINVAL;
1518 }
1519 }
1520 }
1521
1522 ret = vfio_pci_validate_vf_token(vdev, vf_token, &uuid);
1523 if (ret)
1524 return ret;
1525
1526 return 1; /* Match */
1527 }
1528
1529 static const struct vfio_device_ops vfio_pci_ops = {
1530 .name = "vfio-pci",
1531 .open = vfio_pci_open,
1532 .release = vfio_pci_release,
1533 .ioctl = vfio_pci_ioctl,
1534 .read = vfio_pci_read,
1535 .write = vfio_pci_write,
1536 .mmap = vfio_pci_mmap,
1537 .request = vfio_pci_request,
1538 .match = vfio_pci_match,
1539 };
1540
1541 static int vfio_pci_reflck_attach(struct vfio_pci_device *vdev);
1542 static void vfio_pci_reflck_put(struct vfio_pci_reflck *reflck);
1543 static struct pci_driver vfio_pci_driver;
1544
1545 static int vfio_pci_bus_notifier(struct notifier_block *nb,
1546 unsigned long action, void *data)
1547 {
1548 struct vfio_pci_device *vdev = container_of(nb,
1549 struct vfio_pci_device, nb);
1550 struct device *dev = data;
1551 struct pci_dev *pdev = to_pci_dev(dev);
1552 struct pci_dev *physfn = pci_physfn(pdev);
1553
1554 if (action == BUS_NOTIFY_ADD_DEVICE &&
1555 pdev->is_virtfn && physfn == vdev->pdev) {
1556 pci_info(vdev->pdev, "Captured SR-IOV VF %s driver_override\n",
1557 pci_name(pdev));
1558 pdev->driver_override = kasprintf(GFP_KERNEL, "%s",
1559 vfio_pci_ops.name);
1560 } else if (action == BUS_NOTIFY_BOUND_DRIVER &&
1561 pdev->is_virtfn && physfn == vdev->pdev) {
1562 struct pci_driver *drv = pci_dev_driver(pdev);
1563
1564 if (drv && drv != &vfio_pci_driver)
1565 pci_warn(vdev->pdev,
1566 "VF %s bound to driver %s while PF bound to vfio-pci\n",
1567 pci_name(pdev), drv->name);
1568 }
1569
1570 return 0;
1571 }
1572
1573 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1574 {
1575 struct vfio_pci_device *vdev;
1576 struct iommu_group *group;
1577 int ret;
1578
1579 if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
1580 return -EINVAL;
1581
1582 /*
1583 * Prevent binding to PFs with VFs enabled, the VFs might be in use
1584 * by the host or other users. We cannot capture the VFs if they
1585 * already exist, nor can we track VF users. Disabling SR-IOV here
1586 * would initiate removing the VFs, which would unbind the driver,
1587 * which is prone to blocking if that VF is also in use by vfio-pci.
1588 * Just reject these PFs and let the user sort it out.
1589 */
1590 if (pci_num_vf(pdev)) {
1591 pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n");
1592 return -EBUSY;
1593 }
1594
1595 group = vfio_iommu_group_get(&pdev->dev);
1596 if (!group)
1597 return -EINVAL;
1598
1599 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
1600 if (!vdev) {
1601 ret = -ENOMEM;
1602 goto out_group_put;
1603 }
1604
1605 vdev->pdev = pdev;
1606 vdev->irq_type = VFIO_PCI_NUM_IRQS;
1607 mutex_init(&vdev->igate);
1608 spin_lock_init(&vdev->irqlock);
1609 mutex_init(&vdev->ioeventfds_lock);
1610 INIT_LIST_HEAD(&vdev->ioeventfds_list);
1611
1612 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
1613 if (ret)
1614 goto out_free;
1615
1616 ret = vfio_pci_reflck_attach(vdev);
1617 if (ret)
1618 goto out_del_group_dev;
1619
1620 if (pdev->is_physfn) {
1621 vdev->vf_token = kzalloc(sizeof(*vdev->vf_token), GFP_KERNEL);
1622 if (!vdev->vf_token) {
1623 ret = -ENOMEM;
1624 goto out_reflck;
1625 }
1626
1627 mutex_init(&vdev->vf_token->lock);
1628 uuid_gen(&vdev->vf_token->uuid);
1629
1630 vdev->nb.notifier_call = vfio_pci_bus_notifier;
1631 ret = bus_register_notifier(&pci_bus_type, &vdev->nb);
1632 if (ret)
1633 goto out_vf_token;
1634 }
1635
1636 if (vfio_pci_is_vga(pdev)) {
1637 vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode);
1638 vga_set_legacy_decoding(pdev,
1639 vfio_pci_set_vga_decode(vdev, false));
1640 }
1641
1642 vfio_pci_probe_power_state(vdev);
1643
1644 if (!disable_idle_d3) {
1645 /*
1646 * pci-core sets the device power state to an unknown value at
1647 * bootup and after being removed from a driver. The only
1648 * transition it allows from this unknown state is to D0, which
1649 * typically happens when a driver calls pci_enable_device().
1650 * We're not ready to enable the device yet, but we do want to
1651 * be able to get to D3. Therefore first do a D0 transition
1652 * before going to D3.
1653 */
1654 vfio_pci_set_power_state(vdev, PCI_D0);
1655 vfio_pci_set_power_state(vdev, PCI_D3hot);
1656 }
1657
1658 return ret;
1659
1660 out_vf_token:
1661 kfree(vdev->vf_token);
1662 out_reflck:
1663 vfio_pci_reflck_put(vdev->reflck);
1664 out_del_group_dev:
1665 vfio_del_group_dev(&pdev->dev);
1666 out_free:
1667 kfree(vdev);
1668 out_group_put:
1669 vfio_iommu_group_put(group, &pdev->dev);
1670 return ret;
1671 }
1672
1673 static void vfio_pci_remove(struct pci_dev *pdev)
1674 {
1675 struct vfio_pci_device *vdev;
1676
1677 pci_disable_sriov(pdev);
1678
1679 vdev = vfio_del_group_dev(&pdev->dev);
1680 if (!vdev)
1681 return;
1682
1683 if (vdev->vf_token) {
1684 WARN_ON(vdev->vf_token->users);
1685 mutex_destroy(&vdev->vf_token->lock);
1686 kfree(vdev->vf_token);
1687 }
1688
1689 if (vdev->nb.notifier_call)
1690 bus_unregister_notifier(&pci_bus_type, &vdev->nb);
1691
1692 vfio_pci_reflck_put(vdev->reflck);
1693
1694 vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev);
1695 kfree(vdev->region);
1696 mutex_destroy(&vdev->ioeventfds_lock);
1697
1698 if (!disable_idle_d3)
1699 vfio_pci_set_power_state(vdev, PCI_D0);
1700
1701 kfree(vdev->pm_save);
1702 kfree(vdev);
1703
1704 if (vfio_pci_is_vga(pdev)) {
1705 vga_client_register(pdev, NULL, NULL, NULL);
1706 vga_set_legacy_decoding(pdev,
1707 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
1708 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM);
1709 }
1710 }
1711
1712 static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
1713 pci_channel_state_t state)
1714 {
1715 struct vfio_pci_device *vdev;
1716 struct vfio_device *device;
1717
1718 device = vfio_device_get_from_dev(&pdev->dev);
1719 if (device == NULL)
1720 return PCI_ERS_RESULT_DISCONNECT;
1721
1722 vdev = vfio_device_data(device);
1723 if (vdev == NULL) {
1724 vfio_device_put(device);
1725 return PCI_ERS_RESULT_DISCONNECT;
1726 }
1727
1728 mutex_lock(&vdev->igate);
1729
1730 if (vdev->err_trigger)
1731 eventfd_signal(vdev->err_trigger, 1);
1732
1733 mutex_unlock(&vdev->igate);
1734
1735 vfio_device_put(device);
1736
1737 return PCI_ERS_RESULT_CAN_RECOVER;
1738 }
1739
1740 static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
1741 {
1742 struct vfio_pci_device *vdev;
1743 struct vfio_device *device;
1744 int ret = 0;
1745
1746 might_sleep();
1747
1748 if (!enable_sriov)
1749 return -ENOENT;
1750
1751 device = vfio_device_get_from_dev(&pdev->dev);
1752 if (!device)
1753 return -ENODEV;
1754
1755 vdev = vfio_device_data(device);
1756 if (!vdev) {
1757 vfio_device_put(device);
1758 return -ENODEV;
1759 }
1760
1761 if (nr_virtfn == 0)
1762 pci_disable_sriov(pdev);
1763 else
1764 ret = pci_enable_sriov(pdev, nr_virtfn);
1765
1766 vfio_device_put(device);
1767
1768 return ret < 0 ? ret : nr_virtfn;
1769 }
1770
1771 static const struct pci_error_handlers vfio_err_handlers = {
1772 .error_detected = vfio_pci_aer_err_detected,
1773 };
1774
1775 static struct pci_driver vfio_pci_driver = {
1776 .name = "vfio-pci",
1777 .id_table = NULL, /* only dynamic ids */
1778 .probe = vfio_pci_probe,
1779 .remove = vfio_pci_remove,
1780 .sriov_configure = vfio_pci_sriov_configure,
1781 .err_handler = &vfio_err_handlers,
1782 };
1783
1784 static DEFINE_MUTEX(reflck_lock);
1785
1786 static struct vfio_pci_reflck *vfio_pci_reflck_alloc(void)
1787 {
1788 struct vfio_pci_reflck *reflck;
1789
1790 reflck = kzalloc(sizeof(*reflck), GFP_KERNEL);
1791 if (!reflck)
1792 return ERR_PTR(-ENOMEM);
1793
1794 kref_init(&reflck->kref);
1795 mutex_init(&reflck->lock);
1796
1797 return reflck;
1798 }
1799
1800 static void vfio_pci_reflck_get(struct vfio_pci_reflck *reflck)
1801 {
1802 kref_get(&reflck->kref);
1803 }
1804
1805 static int vfio_pci_reflck_find(struct pci_dev *pdev, void *data)
1806 {
1807 struct vfio_pci_reflck **preflck = data;
1808 struct vfio_device *device;
1809 struct vfio_pci_device *vdev;
1810
1811 device = vfio_device_get_from_dev(&pdev->dev);
1812 if (!device)
1813 return 0;
1814
1815 if (pci_dev_driver(pdev) != &vfio_pci_driver) {
1816 vfio_device_put(device);
1817 return 0;
1818 }
1819
1820 vdev = vfio_device_data(device);
1821
1822 if (vdev->reflck) {
1823 vfio_pci_reflck_get(vdev->reflck);
1824 *preflck = vdev->reflck;
1825 vfio_device_put(device);
1826 return 1;
1827 }
1828
1829 vfio_device_put(device);
1830 return 0;
1831 }
1832
1833 static int vfio_pci_reflck_attach(struct vfio_pci_device *vdev)
1834 {
1835 bool slot = !pci_probe_reset_slot(vdev->pdev->slot);
1836
1837 mutex_lock(&reflck_lock);
1838
1839 if (pci_is_root_bus(vdev->pdev->bus) ||
1840 vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_reflck_find,
1841 &vdev->reflck, slot) <= 0)
1842 vdev->reflck = vfio_pci_reflck_alloc();
1843
1844 mutex_unlock(&reflck_lock);
1845
1846 return PTR_ERR_OR_ZERO(vdev->reflck);
1847 }
1848
1849 static void vfio_pci_reflck_release(struct kref *kref)
1850 {
1851 struct vfio_pci_reflck *reflck = container_of(kref,
1852 struct vfio_pci_reflck,
1853 kref);
1854
1855 kfree(reflck);
1856 mutex_unlock(&reflck_lock);
1857 }
1858
1859 static void vfio_pci_reflck_put(struct vfio_pci_reflck *reflck)
1860 {
1861 kref_put_mutex(&reflck->kref, vfio_pci_reflck_release, &reflck_lock);
1862 }
1863
1864 struct vfio_devices {
1865 struct vfio_device **devices;
1866 int cur_index;
1867 int max_index;
1868 };
1869
1870 static int vfio_pci_get_unused_devs(struct pci_dev *pdev, void *data)
1871 {
1872 struct vfio_devices *devs = data;
1873 struct vfio_device *device;
1874 struct vfio_pci_device *vdev;
1875
1876 if (devs->cur_index == devs->max_index)
1877 return -ENOSPC;
1878
1879 device = vfio_device_get_from_dev(&pdev->dev);
1880 if (!device)
1881 return -EINVAL;
1882
1883 if (pci_dev_driver(pdev) != &vfio_pci_driver) {
1884 vfio_device_put(device);
1885 return -EBUSY;
1886 }
1887
1888 vdev = vfio_device_data(device);
1889
1890 /* Fault if the device is not unused */
1891 if (vdev->refcnt) {
1892 vfio_device_put(device);
1893 return -EBUSY;
1894 }
1895
1896 devs->devices[devs->cur_index++] = device;
1897 return 0;
1898 }
1899
1900 /*
1901 * If a bus or slot reset is available for the provided device and:
1902 * - All of the devices affected by that bus or slot reset are unused
1903 * (!refcnt)
1904 * - At least one of the affected devices is marked dirty via
1905 * needs_reset (such as by lack of FLR support)
1906 * Then attempt to perform that bus or slot reset. Callers are required
1907 * to hold vdev->reflck->lock, protecting the bus/slot reset group from
1908 * concurrent opens. A vfio_device reference is acquired for each device
1909 * to prevent unbinds during the reset operation.
1910 *
1911 * NB: vfio-core considers a group to be viable even if some devices are
1912 * bound to drivers like pci-stub or pcieport. Here we require all devices
1913 * to be bound to vfio_pci since that's the only way we can be sure they
1914 * stay put.
1915 */
1916 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
1917 {
1918 struct vfio_devices devs = { .cur_index = 0 };
1919 int i = 0, ret = -EINVAL;
1920 bool slot = false;
1921 struct vfio_pci_device *tmp;
1922
1923 if (!pci_probe_reset_slot(vdev->pdev->slot))
1924 slot = true;
1925 else if (pci_probe_reset_bus(vdev->pdev->bus))
1926 return;
1927
1928 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs,
1929 &i, slot) || !i)
1930 return;
1931
1932 devs.max_index = i;
1933 devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL);
1934 if (!devs.devices)
1935 return;
1936
1937 if (vfio_pci_for_each_slot_or_bus(vdev->pdev,
1938 vfio_pci_get_unused_devs,
1939 &devs, slot))
1940 goto put_devs;
1941
1942 /* Does at least one need a reset? */
1943 for (i = 0; i < devs.cur_index; i++) {
1944 tmp = vfio_device_data(devs.devices[i]);
1945 if (tmp->needs_reset) {
1946 ret = pci_reset_bus(vdev->pdev);
1947 break;
1948 }
1949 }
1950
1951 put_devs:
1952 for (i = 0; i < devs.cur_index; i++) {
1953 tmp = vfio_device_data(devs.devices[i]);
1954
1955 /*
1956 * If reset was successful, affected devices no longer need
1957 * a reset and we should return all the collateral devices
1958 * to low power. If not successful, we either didn't reset
1959 * the bus or timed out waiting for it, so let's not touch
1960 * the power state.
1961 */
1962 if (!ret) {
1963 tmp->needs_reset = false;
1964
1965 if (tmp != vdev && !disable_idle_d3)
1966 vfio_pci_set_power_state(tmp, PCI_D3hot);
1967 }
1968
1969 vfio_device_put(devs.devices[i]);
1970 }
1971
1972 kfree(devs.devices);
1973 }
1974
1975 static void __exit vfio_pci_cleanup(void)
1976 {
1977 pci_unregister_driver(&vfio_pci_driver);
1978 vfio_pci_uninit_perm_bits();
1979 }
1980
1981 static void __init vfio_pci_fill_ids(void)
1982 {
1983 char *p, *id;
1984 int rc;
1985
1986 /* no ids passed actually */
1987 if (ids[0] == '\0')
1988 return;
1989
1990 /* add ids specified in the module parameter */
1991 p = ids;
1992 while ((id = strsep(&p, ","))) {
1993 unsigned int vendor, device, subvendor = PCI_ANY_ID,
1994 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
1995 int fields;
1996
1997 if (!strlen(id))
1998 continue;
1999
2000 fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
2001 &vendor, &device, &subvendor, &subdevice,
2002 &class, &class_mask);
2003
2004 if (fields < 2) {
2005 pr_warn("invalid id string \"%s\"\n", id);
2006 continue;
2007 }
2008
2009 rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
2010 subvendor, subdevice, class, class_mask, 0);
2011 if (rc)
2012 pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
2013 vendor, device, subvendor, subdevice,
2014 class, class_mask, rc);
2015 else
2016 pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
2017 vendor, device, subvendor, subdevice,
2018 class, class_mask);
2019 }
2020 }
2021
2022 static int __init vfio_pci_init(void)
2023 {
2024 int ret;
2025
2026 /* Allocate shared config space permision data used by all devices */
2027 ret = vfio_pci_init_perm_bits();
2028 if (ret)
2029 return ret;
2030
2031 /* Register and scan for devices */
2032 ret = pci_register_driver(&vfio_pci_driver);
2033 if (ret)
2034 goto out_driver;
2035
2036 vfio_pci_fill_ids();
2037
2038 return 0;
2039
2040 out_driver:
2041 vfio_pci_uninit_perm_bits();
2042 return ret;
2043 }
2044
2045 module_init(vfio_pci_init);
2046 module_exit(vfio_pci_cleanup);
2047
2048 MODULE_VERSION(DRIVER_VERSION);
2049 MODULE_LICENSE("GPL v2");
2050 MODULE_AUTHOR(DRIVER_AUTHOR);
2051 MODULE_DESCRIPTION(DRIVER_DESC);
Linux with added FPC-III support