blob: f8a186381ae8726887657c6c868a8b2ceeef2e54 [file] [log] [blame]
Alex Williamson89e1f7d2012-07-31 08:16:24 -06001/*
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#include <linux/device.h>
15#include <linux/eventfd.h>
Alex Williamson8b27ee62013-09-04 11:28:04 -060016#include <linux/file.h>
Alex Williamson89e1f7d2012-07-31 08:16:24 -060017#include <linux/interrupt.h>
18#include <linux/iommu.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/notifier.h>
22#include <linux/pci.h>
23#include <linux/pm_runtime.h>
24#include <linux/slab.h>
25#include <linux/types.h>
26#include <linux/uaccess.h>
27#include <linux/vfio.h>
28
29#include "vfio_pci_private.h"
30
31#define DRIVER_VERSION "0.2"
32#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
33#define DRIVER_DESC "VFIO PCI - User Level meta-driver"
34
35static bool nointxmask;
36module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
37MODULE_PARM_DESC(nointxmask,
38 "Disable support for PCI 2.3 style INTx masking. If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag.");
39
Alex Williamson61d79252014-08-07 11:12:04 -060040static DEFINE_MUTEX(driver_lock);
41
Alex Williamsonbc4fba72014-08-07 11:12:07 -060042static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev);
43
Alex Williamson89e1f7d2012-07-31 08:16:24 -060044static int vfio_pci_enable(struct vfio_pci_device *vdev)
45{
46 struct pci_dev *pdev = vdev->pdev;
47 int ret;
48 u16 cmd;
49 u8 msix_pos;
50
Alex Williamson9c22e662014-08-07 11:12:02 -060051 /* Don't allow our initial saved state to include busmaster */
52 pci_clear_master(pdev);
53
Alex Williamson9a92c502012-12-07 13:43:51 -070054 ret = pci_enable_device(pdev);
55 if (ret)
56 return ret;
57
Alex Williamson89e1f7d2012-07-31 08:16:24 -060058 vdev->reset_works = (pci_reset_function(pdev) == 0);
59 pci_save_state(pdev);
60 vdev->pci_saved_state = pci_store_saved_state(pdev);
61 if (!vdev->pci_saved_state)
62 pr_debug("%s: Couldn't store %s saved state\n",
63 __func__, dev_name(&pdev->dev));
64
65 ret = vfio_config_init(vdev);
Alex Williamson9a92c502012-12-07 13:43:51 -070066 if (ret) {
Alex Williamsoneb5685f2014-05-30 11:35:53 -060067 kfree(vdev->pci_saved_state);
68 vdev->pci_saved_state = NULL;
Alex Williamson9a92c502012-12-07 13:43:51 -070069 pci_disable_device(pdev);
70 return ret;
71 }
Alex Williamson89e1f7d2012-07-31 08:16:24 -060072
73 if (likely(!nointxmask))
74 vdev->pci_2_3 = pci_intx_mask_supported(pdev);
75
76 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
77 if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
78 cmd &= ~PCI_COMMAND_INTX_DISABLE;
79 pci_write_config_word(pdev, PCI_COMMAND, cmd);
80 }
81
Bjorn Helgaasa9047f22013-04-18 15:12:58 -060082 msix_pos = pdev->msix_cap;
Alex Williamson89e1f7d2012-07-31 08:16:24 -060083 if (msix_pos) {
84 u16 flags;
85 u32 table;
86
87 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
88 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
89
Bjorn Helgaas508d1aa2013-04-18 12:42:58 -060090 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
91 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
Alex Williamson89e1f7d2012-07-31 08:16:24 -060092 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
93 } else
94 vdev->msix_bar = 0xFF;
95
Alex Williamson84237a82013-02-18 10:11:13 -070096#ifdef CONFIG_VFIO_PCI_VGA
97 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
98 vdev->has_vga = true;
99#endif
100
Alex Williamson9a92c502012-12-07 13:43:51 -0700101 return 0;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600102}
103
104static void vfio_pci_disable(struct vfio_pci_device *vdev)
105{
Alex Williamson20077222012-12-07 13:43:50 -0700106 struct pci_dev *pdev = vdev->pdev;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600107 int bar;
108
Alex Williamson9c22e662014-08-07 11:12:02 -0600109 /* Stop the device from further DMA */
110 pci_clear_master(pdev);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600111
112 vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
113 VFIO_IRQ_SET_ACTION_TRIGGER,
114 vdev->irq_type, 0, 0, NULL);
115
116 vdev->virq_disabled = false;
117
118 vfio_config_free(vdev);
119
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600120 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
121 if (!vdev->barmap[bar])
122 continue;
Alex Williamson20077222012-12-07 13:43:50 -0700123 pci_iounmap(pdev, vdev->barmap[bar]);
124 pci_release_selected_regions(pdev, 1 << bar);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600125 vdev->barmap[bar] = NULL;
126 }
Alex Williamson20077222012-12-07 13:43:50 -0700127
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600128 vdev->needs_reset = true;
129
Alex Williamson20077222012-12-07 13:43:50 -0700130 /*
131 * If we have saved state, restore it. If we can reset the device,
132 * even better. Resetting with current state seems better than
133 * nothing, but saving and restoring current state without reset
134 * is just busy work.
135 */
136 if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
137 pr_info("%s: Couldn't reload %s saved state\n",
138 __func__, dev_name(&pdev->dev));
139
140 if (!vdev->reset_works)
Alex Williamson9c22e662014-08-07 11:12:02 -0600141 goto out;
Alex Williamson20077222012-12-07 13:43:50 -0700142
143 pci_save_state(pdev);
144 }
145
146 /*
147 * Disable INTx and MSI, presumably to avoid spurious interrupts
148 * during reset. Stolen from pci_reset_function()
149 */
150 pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
151
Alex Williamsond24cdbf2013-06-10 16:40:57 -0600152 /*
Alex Williamson890ed572014-01-14 20:45:09 -0700153 * Try to reset the device. The success of this is dependent on
154 * being able to lock the device, which is not always possible.
Alex Williamsond24cdbf2013-06-10 16:40:57 -0600155 */
156 if (vdev->reset_works) {
Alex Williamson890ed572014-01-14 20:45:09 -0700157 int ret = pci_try_reset_function(pdev);
158 if (ret)
159 pr_warn("%s: Failed to reset device %s (%d)\n",
160 __func__, dev_name(&pdev->dev), ret);
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600161 else
162 vdev->needs_reset = false;
Alex Williamsond24cdbf2013-06-10 16:40:57 -0600163 }
Alex Williamson20077222012-12-07 13:43:50 -0700164
165 pci_restore_state(pdev);
Alex Williamson9c22e662014-08-07 11:12:02 -0600166out:
167 pci_disable_device(pdev);
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600168
169 vfio_pci_try_bus_reset(vdev);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600170}
171
172static void vfio_pci_release(void *device_data)
173{
174 struct vfio_pci_device *vdev = device_data;
175
Alex Williamson61d79252014-08-07 11:12:04 -0600176 mutex_lock(&driver_lock);
177
178 if (!(--vdev->refcnt)) {
Gavin Shan1b69be52014-06-10 11:41:57 +1000179 vfio_spapr_pci_eeh_release(vdev->pdev);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600180 vfio_pci_disable(vdev);
Gavin Shan1b69be52014-06-10 11:41:57 +1000181 }
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600182
Alex Williamson61d79252014-08-07 11:12:04 -0600183 mutex_unlock(&driver_lock);
184
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600185 module_put(THIS_MODULE);
186}
187
188static int vfio_pci_open(void *device_data)
189{
190 struct vfio_pci_device *vdev = device_data;
Alex Williamson61d79252014-08-07 11:12:04 -0600191 int ret = 0;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600192
193 if (!try_module_get(THIS_MODULE))
194 return -ENODEV;
195
Alex Williamson61d79252014-08-07 11:12:04 -0600196 mutex_lock(&driver_lock);
197
198 if (!vdev->refcnt) {
Gavin Shan1b69be52014-06-10 11:41:57 +1000199 ret = vfio_pci_enable(vdev);
200 if (ret)
201 goto error;
202
Alexey Kardashevskiy9b936c92014-08-08 10:39:16 -0600203 vfio_spapr_pci_eeh_open(vdev->pdev);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600204 }
Alex Williamson61d79252014-08-07 11:12:04 -0600205 vdev->refcnt++;
Gavin Shan1b69be52014-06-10 11:41:57 +1000206error:
Alex Williamson61d79252014-08-07 11:12:04 -0600207 mutex_unlock(&driver_lock);
208 if (ret)
209 module_put(THIS_MODULE);
Gavin Shan1b69be52014-06-10 11:41:57 +1000210 return ret;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600211}
212
213static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
214{
215 if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
216 u8 pin;
217 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
Frank Blaschka1d53a3a2014-11-07 09:52:22 -0700218 if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && pin)
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600219 return 1;
220
221 } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
222 u8 pos;
223 u16 flags;
224
Bjorn Helgaasa9047f22013-04-18 15:12:58 -0600225 pos = vdev->pdev->msi_cap;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600226 if (pos) {
227 pci_read_config_word(vdev->pdev,
228 pos + PCI_MSI_FLAGS, &flags);
Gavin Shanfd49c81f2014-05-30 11:35:54 -0600229 return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600230 }
231 } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
232 u8 pos;
233 u16 flags;
234
Bjorn Helgaasa9047f22013-04-18 15:12:58 -0600235 pos = vdev->pdev->msix_cap;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600236 if (pos) {
237 pci_read_config_word(vdev->pdev,
238 pos + PCI_MSIX_FLAGS, &flags);
239
240 return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
241 }
Alex Williamson6140a8f2015-02-06 15:05:08 -0700242 } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
Vijay Mohan Pandarathildad9f892013-03-11 09:31:22 -0600243 if (pci_is_pcie(vdev->pdev))
244 return 1;
Alex Williamson6140a8f2015-02-06 15:05:08 -0700245 } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
246 return 1;
247 }
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600248
249 return 0;
250}
251
Alex Williamson8b27ee62013-09-04 11:28:04 -0600252static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
253{
254 (*(int *)data)++;
255 return 0;
256}
257
258struct vfio_pci_fill_info {
259 int max;
260 int cur;
261 struct vfio_pci_dependent_device *devices;
262};
263
264static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
265{
266 struct vfio_pci_fill_info *fill = data;
267 struct iommu_group *iommu_group;
268
269 if (fill->cur == fill->max)
270 return -EAGAIN; /* Something changed, try again */
271
272 iommu_group = iommu_group_get(&pdev->dev);
273 if (!iommu_group)
274 return -EPERM; /* Cannot reset non-isolated devices */
275
276 fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
277 fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
278 fill->devices[fill->cur].bus = pdev->bus->number;
279 fill->devices[fill->cur].devfn = pdev->devfn;
280 fill->cur++;
281 iommu_group_put(iommu_group);
282 return 0;
283}
284
285struct vfio_pci_group_entry {
286 struct vfio_group *group;
287 int id;
288};
289
290struct vfio_pci_group_info {
291 int count;
292 struct vfio_pci_group_entry *groups;
293};
294
295static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
296{
297 struct vfio_pci_group_info *info = data;
298 struct iommu_group *group;
299 int id, i;
300
301 group = iommu_group_get(&pdev->dev);
302 if (!group)
303 return -EPERM;
304
305 id = iommu_group_id(group);
306
307 for (i = 0; i < info->count; i++)
308 if (info->groups[i].id == id)
309 break;
310
311 iommu_group_put(group);
312
313 return (i == info->count) ? -EINVAL : 0;
314}
315
316static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
317{
318 for (; pdev; pdev = pdev->bus->self)
319 if (pdev->bus == slot->bus)
320 return (pdev->slot == slot);
321 return false;
322}
323
324struct vfio_pci_walk_info {
325 int (*fn)(struct pci_dev *, void *data);
326 void *data;
327 struct pci_dev *pdev;
328 bool slot;
329 int ret;
330};
331
332static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
333{
334 struct vfio_pci_walk_info *walk = data;
335
336 if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
337 walk->ret = walk->fn(pdev, walk->data);
338
339 return walk->ret;
340}
341
342static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
343 int (*fn)(struct pci_dev *,
344 void *data), void *data,
345 bool slot)
346{
347 struct vfio_pci_walk_info walk = {
348 .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
349 };
350
351 pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
352
353 return walk.ret;
354}
355
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600356static long vfio_pci_ioctl(void *device_data,
357 unsigned int cmd, unsigned long arg)
358{
359 struct vfio_pci_device *vdev = device_data;
360 unsigned long minsz;
361
362 if (cmd == VFIO_DEVICE_GET_INFO) {
363 struct vfio_device_info info;
364
365 minsz = offsetofend(struct vfio_device_info, num_irqs);
366
367 if (copy_from_user(&info, (void __user *)arg, minsz))
368 return -EFAULT;
369
370 if (info.argsz < minsz)
371 return -EINVAL;
372
373 info.flags = VFIO_DEVICE_FLAGS_PCI;
374
375 if (vdev->reset_works)
376 info.flags |= VFIO_DEVICE_FLAGS_RESET;
377
378 info.num_regions = VFIO_PCI_NUM_REGIONS;
379 info.num_irqs = VFIO_PCI_NUM_IRQS;
380
381 return copy_to_user((void __user *)arg, &info, minsz);
382
383 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
384 struct pci_dev *pdev = vdev->pdev;
385 struct vfio_region_info info;
386
387 minsz = offsetofend(struct vfio_region_info, offset);
388
389 if (copy_from_user(&info, (void __user *)arg, minsz))
390 return -EFAULT;
391
392 if (info.argsz < minsz)
393 return -EINVAL;
394
395 switch (info.index) {
396 case VFIO_PCI_CONFIG_REGION_INDEX:
397 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
398 info.size = pdev->cfg_size;
399 info.flags = VFIO_REGION_INFO_FLAG_READ |
400 VFIO_REGION_INFO_FLAG_WRITE;
401 break;
402 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
403 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
404 info.size = pci_resource_len(pdev, info.index);
405 if (!info.size) {
406 info.flags = 0;
407 break;
408 }
409
410 info.flags = VFIO_REGION_INFO_FLAG_READ |
411 VFIO_REGION_INFO_FLAG_WRITE;
Frank Blaschka1d53a3a2014-11-07 09:52:22 -0700412 if (IS_ENABLED(CONFIG_VFIO_PCI_MMAP) &&
413 pci_resource_flags(pdev, info.index) &
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600414 IORESOURCE_MEM && info.size >= PAGE_SIZE)
415 info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
416 break;
417 case VFIO_PCI_ROM_REGION_INDEX:
418 {
419 void __iomem *io;
420 size_t size;
421
422 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
423 info.flags = 0;
424
425 /* Report the BAR size, not the ROM size */
426 info.size = pci_resource_len(pdev, info.index);
427 if (!info.size)
428 break;
429
430 /* Is it really there? */
431 io = pci_map_rom(pdev, &size);
432 if (!io || !size) {
433 info.size = 0;
434 break;
435 }
436 pci_unmap_rom(pdev, io);
437
438 info.flags = VFIO_REGION_INFO_FLAG_READ;
439 break;
440 }
Alex Williamson84237a82013-02-18 10:11:13 -0700441 case VFIO_PCI_VGA_REGION_INDEX:
442 if (!vdev->has_vga)
443 return -EINVAL;
444
445 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
446 info.size = 0xc0000;
447 info.flags = VFIO_REGION_INFO_FLAG_READ |
448 VFIO_REGION_INFO_FLAG_WRITE;
449
450 break;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600451 default:
452 return -EINVAL;
453 }
454
455 return copy_to_user((void __user *)arg, &info, minsz);
456
457 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
458 struct vfio_irq_info info;
459
460 minsz = offsetofend(struct vfio_irq_info, count);
461
462 if (copy_from_user(&info, (void __user *)arg, minsz))
463 return -EFAULT;
464
465 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
466 return -EINVAL;
467
Vijay Mohan Pandarathildad9f892013-03-11 09:31:22 -0600468 switch (info.index) {
469 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
Alex Williamson6140a8f2015-02-06 15:05:08 -0700470 case VFIO_PCI_REQ_IRQ_INDEX:
Vijay Mohan Pandarathildad9f892013-03-11 09:31:22 -0600471 break;
472 case VFIO_PCI_ERR_IRQ_INDEX:
473 if (pci_is_pcie(vdev->pdev))
474 break;
475 /* pass thru to return error */
476 default:
477 return -EINVAL;
478 }
479
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600480 info.flags = VFIO_IRQ_INFO_EVENTFD;
481
482 info.count = vfio_pci_get_irq_count(vdev, info.index);
483
484 if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
485 info.flags |= (VFIO_IRQ_INFO_MASKABLE |
486 VFIO_IRQ_INFO_AUTOMASKED);
487 else
488 info.flags |= VFIO_IRQ_INFO_NORESIZE;
489
490 return copy_to_user((void __user *)arg, &info, minsz);
491
492 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
493 struct vfio_irq_set hdr;
494 u8 *data = NULL;
495 int ret = 0;
496
497 minsz = offsetofend(struct vfio_irq_set, count);
498
499 if (copy_from_user(&hdr, (void __user *)arg, minsz))
500 return -EFAULT;
501
502 if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS ||
503 hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
504 VFIO_IRQ_SET_ACTION_TYPE_MASK))
505 return -EINVAL;
506
507 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
508 size_t size;
Alex Williamson904c6802013-03-26 11:33:16 -0600509 int max = vfio_pci_get_irq_count(vdev, hdr.index);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600510
511 if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
512 size = sizeof(uint8_t);
513 else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
514 size = sizeof(int32_t);
515 else
516 return -EINVAL;
517
518 if (hdr.argsz - minsz < hdr.count * size ||
Alex Williamson904c6802013-03-26 11:33:16 -0600519 hdr.start >= max || hdr.start + hdr.count > max)
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600520 return -EINVAL;
521
Fengguang Wu3a1f7042012-12-07 13:43:49 -0700522 data = memdup_user((void __user *)(arg + minsz),
523 hdr.count * size);
524 if (IS_ERR(data))
525 return PTR_ERR(data);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600526 }
527
528 mutex_lock(&vdev->igate);
529
530 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
531 hdr.start, hdr.count, data);
532
533 mutex_unlock(&vdev->igate);
534 kfree(data);
535
536 return ret;
537
Alex Williamson8b27ee62013-09-04 11:28:04 -0600538 } else if (cmd == VFIO_DEVICE_RESET) {
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600539 return vdev->reset_works ?
Alex Williamson890ed572014-01-14 20:45:09 -0700540 pci_try_reset_function(vdev->pdev) : -EINVAL;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600541
Alex Williamson8b27ee62013-09-04 11:28:04 -0600542 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
543 struct vfio_pci_hot_reset_info hdr;
544 struct vfio_pci_fill_info fill = { 0 };
545 struct vfio_pci_dependent_device *devices = NULL;
546 bool slot = false;
547 int ret = 0;
548
549 minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
550
551 if (copy_from_user(&hdr, (void __user *)arg, minsz))
552 return -EFAULT;
553
554 if (hdr.argsz < minsz)
555 return -EINVAL;
556
557 hdr.flags = 0;
558
559 /* Can we do a slot or bus reset or neither? */
560 if (!pci_probe_reset_slot(vdev->pdev->slot))
561 slot = true;
562 else if (pci_probe_reset_bus(vdev->pdev->bus))
563 return -ENODEV;
564
565 /* How many devices are affected? */
566 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
567 vfio_pci_count_devs,
568 &fill.max, slot);
569 if (ret)
570 return ret;
571
572 WARN_ON(!fill.max); /* Should always be at least one */
573
574 /*
575 * If there's enough space, fill it now, otherwise return
576 * -ENOSPC and the number of devices affected.
577 */
578 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
579 ret = -ENOSPC;
580 hdr.count = fill.max;
581 goto reset_info_exit;
582 }
583
584 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
585 if (!devices)
586 return -ENOMEM;
587
588 fill.devices = devices;
589
590 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
591 vfio_pci_fill_devs,
592 &fill, slot);
593
594 /*
595 * If a device was removed between counting and filling,
596 * we may come up short of fill.max. If a device was
597 * added, we'll have a return of -EAGAIN above.
598 */
599 if (!ret)
600 hdr.count = fill.cur;
601
602reset_info_exit:
603 if (copy_to_user((void __user *)arg, &hdr, minsz))
604 ret = -EFAULT;
605
606 if (!ret) {
607 if (copy_to_user((void __user *)(arg + minsz), devices,
608 hdr.count * sizeof(*devices)))
609 ret = -EFAULT;
610 }
611
612 kfree(devices);
613 return ret;
614
615 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
616 struct vfio_pci_hot_reset hdr;
617 int32_t *group_fds;
618 struct vfio_pci_group_entry *groups;
619 struct vfio_pci_group_info info;
620 bool slot = false;
621 int i, count = 0, ret = 0;
622
623 minsz = offsetofend(struct vfio_pci_hot_reset, count);
624
625 if (copy_from_user(&hdr, (void __user *)arg, minsz))
626 return -EFAULT;
627
628 if (hdr.argsz < minsz || hdr.flags)
629 return -EINVAL;
630
631 /* Can we do a slot or bus reset or neither? */
632 if (!pci_probe_reset_slot(vdev->pdev->slot))
633 slot = true;
634 else if (pci_probe_reset_bus(vdev->pdev->bus))
635 return -ENODEV;
636
637 /*
638 * We can't let userspace give us an arbitrarily large
639 * buffer to copy, so verify how many we think there
640 * could be. Note groups can have multiple devices so
641 * one group per device is the max.
642 */
643 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
644 vfio_pci_count_devs,
645 &count, slot);
646 if (ret)
647 return ret;
648
649 /* Somewhere between 1 and count is OK */
650 if (!hdr.count || hdr.count > count)
651 return -EINVAL;
652
653 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
654 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
655 if (!group_fds || !groups) {
656 kfree(group_fds);
657 kfree(groups);
658 return -ENOMEM;
659 }
660
661 if (copy_from_user(group_fds, (void __user *)(arg + minsz),
662 hdr.count * sizeof(*group_fds))) {
663 kfree(group_fds);
664 kfree(groups);
665 return -EFAULT;
666 }
667
668 /*
669 * For each group_fd, get the group through the vfio external
670 * user interface and store the group and iommu ID. This
671 * ensures the group is held across the reset.
672 */
673 for (i = 0; i < hdr.count; i++) {
674 struct vfio_group *group;
675 struct fd f = fdget(group_fds[i]);
676 if (!f.file) {
677 ret = -EBADF;
678 break;
679 }
680
681 group = vfio_group_get_external_user(f.file);
682 fdput(f);
683 if (IS_ERR(group)) {
684 ret = PTR_ERR(group);
685 break;
686 }
687
688 groups[i].group = group;
689 groups[i].id = vfio_external_user_iommu_id(group);
690 }
691
692 kfree(group_fds);
693
694 /* release reference to groups on error */
695 if (ret)
696 goto hot_reset_release;
697
698 info.count = hdr.count;
699 info.groups = groups;
700
701 /*
702 * Test whether all the affected devices are contained
703 * by the set of groups provided by the user.
704 */
705 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
706 vfio_pci_validate_devs,
707 &info, slot);
708 if (!ret)
709 /* User has access, do the reset */
Alex Williamson890ed572014-01-14 20:45:09 -0700710 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
711 pci_try_reset_bus(vdev->pdev->bus);
Alex Williamson8b27ee62013-09-04 11:28:04 -0600712
713hot_reset_release:
714 for (i--; i >= 0; i--)
715 vfio_group_put_external_user(groups[i].group);
716
717 kfree(groups);
718 return ret;
719 }
720
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600721 return -ENOTTY;
722}
723
Alex Williamson5b279a12013-02-14 14:02:12 -0700724static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
725 size_t count, loff_t *ppos, bool iswrite)
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600726{
727 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
728 struct vfio_pci_device *vdev = device_data;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600729
730 if (index >= VFIO_PCI_NUM_REGIONS)
731 return -EINVAL;
732
Alex Williamson5b279a12013-02-14 14:02:12 -0700733 switch (index) {
734 case VFIO_PCI_CONFIG_REGION_INDEX:
Alex Williamson906ee992013-02-14 14:02:12 -0700735 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
736
Alex Williamson5b279a12013-02-14 14:02:12 -0700737 case VFIO_PCI_ROM_REGION_INDEX:
738 if (iswrite)
739 return -EINVAL;
Alex Williamson906ee992013-02-14 14:02:12 -0700740 return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600741
Alex Williamson5b279a12013-02-14 14:02:12 -0700742 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
Alex Williamson906ee992013-02-14 14:02:12 -0700743 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
Alex Williamson84237a82013-02-18 10:11:13 -0700744
745 case VFIO_PCI_VGA_REGION_INDEX:
746 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
Alex Williamson5b279a12013-02-14 14:02:12 -0700747 }
748
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600749 return -EINVAL;
750}
751
Alex Williamson5b279a12013-02-14 14:02:12 -0700752static ssize_t vfio_pci_read(void *device_data, char __user *buf,
753 size_t count, loff_t *ppos)
754{
Alex Williamson906ee992013-02-14 14:02:12 -0700755 if (!count)
756 return 0;
757
Alex Williamson5b279a12013-02-14 14:02:12 -0700758 return vfio_pci_rw(device_data, buf, count, ppos, false);
759}
760
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600761static ssize_t vfio_pci_write(void *device_data, const char __user *buf,
762 size_t count, loff_t *ppos)
763{
Alex Williamson906ee992013-02-14 14:02:12 -0700764 if (!count)
765 return 0;
766
767 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600768}
769
770static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
771{
772 struct vfio_pci_device *vdev = device_data;
773 struct pci_dev *pdev = vdev->pdev;
774 unsigned int index;
Alex Williamson34002f52012-10-10 09:10:31 -0600775 u64 phys_len, req_len, pgoff, req_start;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600776 int ret;
777
778 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
779
780 if (vma->vm_end < vma->vm_start)
781 return -EINVAL;
782 if ((vma->vm_flags & VM_SHARED) == 0)
783 return -EINVAL;
784 if (index >= VFIO_PCI_ROM_REGION_INDEX)
785 return -EINVAL;
786 if (!(pci_resource_flags(pdev, index) & IORESOURCE_MEM))
787 return -EINVAL;
788
789 phys_len = pci_resource_len(pdev, index);
790 req_len = vma->vm_end - vma->vm_start;
791 pgoff = vma->vm_pgoff &
792 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
793 req_start = pgoff << PAGE_SHIFT;
794
795 if (phys_len < PAGE_SIZE || req_start + req_len > phys_len)
796 return -EINVAL;
797
798 if (index == vdev->msix_bar) {
799 /*
800 * Disallow mmaps overlapping the MSI-X table; users don't
801 * get to touch this directly. We could find somewhere
802 * else to map the overlap, but page granularity is only
803 * a recommendation, not a requirement, so the user needs
804 * to know which bits are real. Requiring them to mmap
805 * around the table makes that clear.
806 */
807
808 /* If neither entirely above nor below, then it overlaps */
809 if (!(req_start >= vdev->msix_offset + vdev->msix_size ||
810 req_start + req_len <= vdev->msix_offset))
811 return -EINVAL;
812 }
813
814 /*
815 * Even though we don't make use of the barmap for the mmap,
816 * we need to request the region and the barmap tracks that.
817 */
818 if (!vdev->barmap[index]) {
819 ret = pci_request_selected_regions(pdev,
820 1 << index, "vfio-pci");
821 if (ret)
822 return ret;
823
824 vdev->barmap[index] = pci_iomap(pdev, index, 0);
825 }
826
827 vma->vm_private_data = vdev;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600828 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
Alex Williamson34002f52012-10-10 09:10:31 -0600829 vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600830
Alex Williamson34002f52012-10-10 09:10:31 -0600831 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600832 req_len, vma->vm_page_prot);
833}
834
Alex Williamson6140a8f2015-02-06 15:05:08 -0700835static void vfio_pci_request(void *device_data, unsigned int count)
836{
837 struct vfio_pci_device *vdev = device_data;
838
839 mutex_lock(&vdev->igate);
840
841 if (vdev->req_trigger) {
842 dev_dbg(&vdev->pdev->dev, "Requesting device from user\n");
843 eventfd_signal(vdev->req_trigger, 1);
844 }
845
846 mutex_unlock(&vdev->igate);
847}
848
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600849static const struct vfio_device_ops vfio_pci_ops = {
850 .name = "vfio-pci",
851 .open = vfio_pci_open,
852 .release = vfio_pci_release,
853 .ioctl = vfio_pci_ioctl,
854 .read = vfio_pci_read,
855 .write = vfio_pci_write,
856 .mmap = vfio_pci_mmap,
Alex Williamson6140a8f2015-02-06 15:05:08 -0700857 .request = vfio_pci_request,
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600858};
859
860static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
861{
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600862 struct vfio_pci_device *vdev;
863 struct iommu_group *group;
864 int ret;
865
Wei Yang7c2e2112015-01-07 10:29:11 -0700866 if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600867 return -EINVAL;
868
869 group = iommu_group_get(&pdev->dev);
870 if (!group)
871 return -EINVAL;
872
873 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
874 if (!vdev) {
875 iommu_group_put(group);
876 return -ENOMEM;
877 }
878
879 vdev->pdev = pdev;
880 vdev->irq_type = VFIO_PCI_NUM_IRQS;
881 mutex_init(&vdev->igate);
882 spin_lock_init(&vdev->irqlock);
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600883
884 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
885 if (ret) {
886 iommu_group_put(group);
887 kfree(vdev);
888 }
889
890 return ret;
891}
892
893static void vfio_pci_remove(struct pci_dev *pdev)
894{
895 struct vfio_pci_device *vdev;
896
Alex Williamson61d79252014-08-07 11:12:04 -0600897 vdev = vfio_del_group_dev(&pdev->dev);
898 if (vdev) {
899 iommu_group_put(pdev->dev.iommu_group);
900 kfree(vdev);
901 }
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600902}
903
Vijay Mohan Pandarathildad9f892013-03-11 09:31:22 -0600904static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
905 pci_channel_state_t state)
906{
907 struct vfio_pci_device *vdev;
908 struct vfio_device *device;
909
910 device = vfio_device_get_from_dev(&pdev->dev);
911 if (device == NULL)
912 return PCI_ERS_RESULT_DISCONNECT;
913
914 vdev = vfio_device_data(device);
915 if (vdev == NULL) {
916 vfio_device_put(device);
917 return PCI_ERS_RESULT_DISCONNECT;
918 }
919
Alex Williamson3be3a072014-01-14 16:12:55 -0700920 mutex_lock(&vdev->igate);
921
Vijay Mohan Pandarathildad9f892013-03-11 09:31:22 -0600922 if (vdev->err_trigger)
923 eventfd_signal(vdev->err_trigger, 1);
924
Alex Williamson3be3a072014-01-14 16:12:55 -0700925 mutex_unlock(&vdev->igate);
926
Vijay Mohan Pandarathildad9f892013-03-11 09:31:22 -0600927 vfio_device_put(device);
928
929 return PCI_ERS_RESULT_CAN_RECOVER;
930}
931
932static struct pci_error_handlers vfio_err_handlers = {
933 .error_detected = vfio_pci_aer_err_detected,
934};
935
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600936static struct pci_driver vfio_pci_driver = {
937 .name = "vfio-pci",
938 .id_table = NULL, /* only dynamic ids */
939 .probe = vfio_pci_probe,
940 .remove = vfio_pci_remove,
Vijay Mohan Pandarathildad9f892013-03-11 09:31:22 -0600941 .err_handler = &vfio_err_handlers,
Alex Williamson89e1f7d2012-07-31 08:16:24 -0600942};
943
Alex Williamson93899a62014-09-29 17:18:39 -0600944struct vfio_devices {
945 struct vfio_device **devices;
946 int cur_index;
947 int max_index;
948};
949
950static int vfio_pci_get_devs(struct pci_dev *pdev, void *data)
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600951{
Alex Williamson93899a62014-09-29 17:18:39 -0600952 struct vfio_devices *devs = data;
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600953 struct pci_driver *pci_drv = ACCESS_ONCE(pdev->driver);
954
Alex Williamson93899a62014-09-29 17:18:39 -0600955 if (pci_drv != &vfio_pci_driver)
956 return -EBUSY;
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600957
Alex Williamson93899a62014-09-29 17:18:39 -0600958 if (devs->cur_index == devs->max_index)
959 return -ENOSPC;
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600960
Alex Williamson93899a62014-09-29 17:18:39 -0600961 devs->devices[devs->cur_index] = vfio_device_get_from_dev(&pdev->dev);
962 if (!devs->devices[devs->cur_index])
963 return -EINVAL;
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600964
Alex Williamson93899a62014-09-29 17:18:39 -0600965 devs->cur_index++;
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600966 return 0;
967}
968
969/*
970 * Attempt to do a bus/slot reset if there are devices affected by a reset for
971 * this device that are needs_reset and all of the affected devices are unused
Alex Williamson93899a62014-09-29 17:18:39 -0600972 * (!refcnt). Callers are required to hold driver_lock when calling this to
973 * prevent device opens and concurrent bus reset attempts. We prevent device
974 * unbinds by acquiring and holding a reference to the vfio_device.
975 *
976 * NB: vfio-core considers a group to be viable even if some devices are
977 * bound to drivers like pci-stub or pcieport. Here we require all devices
978 * to be bound to vfio_pci since that's the only way we can be sure they
979 * stay put.
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600980 */
981static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev)
982{
Alex Williamson93899a62014-09-29 17:18:39 -0600983 struct vfio_devices devs = { .cur_index = 0 };
984 int i = 0, ret = -EINVAL;
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600985 bool needs_reset = false, slot = false;
Alex Williamson93899a62014-09-29 17:18:39 -0600986 struct vfio_pci_device *tmp;
Alex Williamsonbc4fba72014-08-07 11:12:07 -0600987
988 if (!pci_probe_reset_slot(vdev->pdev->slot))
989 slot = true;
990 else if (pci_probe_reset_bus(vdev->pdev->bus))
991 return;
992
Alex Williamson93899a62014-09-29 17:18:39 -0600993 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs,
994 &i, slot) || !i)
995 return;
996
997 devs.max_index = i;
998 devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL);
999 if (!devs.devices)
1000 return;
1001
Alex Williamsonbc4fba72014-08-07 11:12:07 -06001002 if (vfio_pci_for_each_slot_or_bus(vdev->pdev,
Alex Williamson93899a62014-09-29 17:18:39 -06001003 vfio_pci_get_devs, &devs, slot))
1004 goto put_devs;
Alex Williamsonbc4fba72014-08-07 11:12:07 -06001005
Alex Williamson93899a62014-09-29 17:18:39 -06001006 for (i = 0; i < devs.cur_index; i++) {
1007 tmp = vfio_device_data(devs.devices[i]);
1008 if (tmp->needs_reset)
1009 needs_reset = true;
1010 if (tmp->refcnt)
1011 goto put_devs;
1012 }
Alex Williamsonbc4fba72014-08-07 11:12:07 -06001013
Alex Williamson93899a62014-09-29 17:18:39 -06001014 if (needs_reset)
1015 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
1016 pci_try_reset_bus(vdev->pdev->bus);
Alex Williamsonbc4fba72014-08-07 11:12:07 -06001017
Alex Williamson93899a62014-09-29 17:18:39 -06001018put_devs:
1019 for (i = 0; i < devs.cur_index; i++) {
1020 if (!ret) {
1021 tmp = vfio_device_data(devs.devices[i]);
1022 tmp->needs_reset = false;
1023 }
1024 vfio_device_put(devs.devices[i]);
1025 }
1026
1027 kfree(devs.devices);
Alex Williamsonbc4fba72014-08-07 11:12:07 -06001028}
1029
Alex Williamson89e1f7d2012-07-31 08:16:24 -06001030static void __exit vfio_pci_cleanup(void)
1031{
1032 pci_unregister_driver(&vfio_pci_driver);
1033 vfio_pci_virqfd_exit();
1034 vfio_pci_uninit_perm_bits();
1035}
1036
1037static int __init vfio_pci_init(void)
1038{
1039 int ret;
1040
1041 /* Allocate shared config space permision data used by all devices */
1042 ret = vfio_pci_init_perm_bits();
1043 if (ret)
1044 return ret;
1045
1046 /* Start the virqfd cleanup handler */
1047 ret = vfio_pci_virqfd_init();
1048 if (ret)
1049 goto out_virqfd;
1050
1051 /* Register and scan for devices */
1052 ret = pci_register_driver(&vfio_pci_driver);
1053 if (ret)
1054 goto out_driver;
1055
1056 return 0;
1057
Alex Williamson89e1f7d2012-07-31 08:16:24 -06001058out_driver:
Jiang Liu05bf3aa2012-12-07 13:43:51 -07001059 vfio_pci_virqfd_exit();
1060out_virqfd:
Alex Williamson89e1f7d2012-07-31 08:16:24 -06001061 vfio_pci_uninit_perm_bits();
1062 return ret;
1063}
1064
1065module_init(vfio_pci_init);
1066module_exit(vfio_pci_cleanup);
1067
1068MODULE_VERSION(DRIVER_VERSION);
1069MODULE_LICENSE("GPL v2");
1070MODULE_AUTHOR(DRIVER_AUTHOR);
1071MODULE_DESCRIPTION(DRIVER_DESC);