]>
Commit | Line | Data |
---|---|---|
89e1f7d4 AW |
1 | /* |
2 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. | |
3 | * Author: Alex Williamson <alex.williamson@redhat.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * Derived from original vfio: | |
10 | * Copyright 2010 Cisco Systems, Inc. All rights reserved. | |
11 | * Author: Tom Lyon, pugs@cisco.com | |
12 | */ | |
13 | ||
80c7e8cc AW |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
89e1f7d4 AW |
16 | #include <linux/device.h> |
17 | #include <linux/eventfd.h> | |
8b27ee60 | 18 | #include <linux/file.h> |
89e1f7d4 AW |
19 | #include <linux/interrupt.h> |
20 | #include <linux/iommu.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/notifier.h> | |
24 | #include <linux/pci.h> | |
25 | #include <linux/pm_runtime.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/uaccess.h> | |
29 | #include <linux/vfio.h> | |
ecaa1f6a | 30 | #include <linux/vgaarb.h> |
89e1f7d4 AW |
31 | |
32 | #include "vfio_pci_private.h" | |
33 | ||
34 | #define DRIVER_VERSION "0.2" | |
35 | #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>" | |
36 | #define DRIVER_DESC "VFIO PCI - User Level meta-driver" | |
37 | ||
80c7e8cc AW |
38 | static char ids[1024] __initdata; |
39 | module_param_string(ids, ids, sizeof(ids), 0); | |
40 | 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"); | |
41 | ||
89e1f7d4 AW |
42 | static bool nointxmask; |
43 | module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR); | |
44 | MODULE_PARM_DESC(nointxmask, | |
45 | "Disable support for PCI 2.3 style INTx masking. If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag."); | |
46 | ||
88c0dead AW |
47 | #ifdef CONFIG_VFIO_PCI_VGA |
48 | static bool disable_vga; | |
49 | module_param(disable_vga, bool, S_IRUGO); | |
50 | MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci"); | |
51 | #endif | |
52 | ||
6eb70187 AW |
53 | static bool disable_idle_d3; |
54 | module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR); | |
55 | MODULE_PARM_DESC(disable_idle_d3, | |
56 | "Disable using the PCI D3 low power state for idle, unused devices"); | |
57 | ||
61d79256 AW |
58 | static DEFINE_MUTEX(driver_lock); |
59 | ||
88c0dead AW |
60 | static inline bool vfio_vga_disabled(void) |
61 | { | |
62 | #ifdef CONFIG_VFIO_PCI_VGA | |
63 | return disable_vga; | |
64 | #else | |
65 | return true; | |
66 | #endif | |
67 | } | |
68 | ||
ecaa1f6a AW |
69 | /* |
70 | * Our VGA arbiter participation is limited since we don't know anything | |
71 | * about the device itself. However, if the device is the only VGA device | |
72 | * downstream of a bridge and VFIO VGA support is disabled, then we can | |
73 | * safely return legacy VGA IO and memory as not decoded since the user | |
74 | * has no way to get to it and routing can be disabled externally at the | |
75 | * bridge. | |
76 | */ | |
77 | static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga) | |
78 | { | |
79 | struct vfio_pci_device *vdev = opaque; | |
80 | struct pci_dev *tmp = NULL, *pdev = vdev->pdev; | |
81 | unsigned char max_busnr; | |
82 | unsigned int decodes; | |
83 | ||
84 | if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus)) | |
85 | return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | | |
86 | VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; | |
87 | ||
88 | max_busnr = pci_bus_max_busnr(pdev->bus); | |
89 | decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; | |
90 | ||
91 | while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) { | |
92 | if (tmp == pdev || | |
93 | pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) || | |
94 | pci_is_root_bus(tmp->bus)) | |
95 | continue; | |
96 | ||
97 | if (tmp->bus->number >= pdev->bus->number && | |
98 | tmp->bus->number <= max_busnr) { | |
99 | pci_dev_put(tmp); | |
100 | decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; | |
101 | break; | |
102 | } | |
103 | } | |
104 | ||
105 | return decodes; | |
106 | } | |
107 | ||
108 | static inline bool vfio_pci_is_vga(struct pci_dev *pdev) | |
109 | { | |
110 | return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; | |
111 | } | |
112 | ||
bc4fba77 AW |
113 | static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev); |
114 | ||
89e1f7d4 AW |
115 | static int vfio_pci_enable(struct vfio_pci_device *vdev) |
116 | { | |
117 | struct pci_dev *pdev = vdev->pdev; | |
118 | int ret; | |
119 | u16 cmd; | |
120 | u8 msix_pos; | |
121 | ||
6eb70187 AW |
122 | pci_set_power_state(pdev, PCI_D0); |
123 | ||
9c22e660 AW |
124 | /* Don't allow our initial saved state to include busmaster */ |
125 | pci_clear_master(pdev); | |
126 | ||
9a92c509 AW |
127 | ret = pci_enable_device(pdev); |
128 | if (ret) | |
129 | return ret; | |
130 | ||
89e1f7d4 AW |
131 | vdev->reset_works = (pci_reset_function(pdev) == 0); |
132 | pci_save_state(pdev); | |
133 | vdev->pci_saved_state = pci_store_saved_state(pdev); | |
134 | if (!vdev->pci_saved_state) | |
135 | pr_debug("%s: Couldn't store %s saved state\n", | |
136 | __func__, dev_name(&pdev->dev)); | |
137 | ||
138 | ret = vfio_config_init(vdev); | |
9a92c509 | 139 | if (ret) { |
eb5685f0 AW |
140 | kfree(vdev->pci_saved_state); |
141 | vdev->pci_saved_state = NULL; | |
9a92c509 AW |
142 | pci_disable_device(pdev); |
143 | return ret; | |
144 | } | |
89e1f7d4 AW |
145 | |
146 | if (likely(!nointxmask)) | |
147 | vdev->pci_2_3 = pci_intx_mask_supported(pdev); | |
148 | ||
149 | pci_read_config_word(pdev, PCI_COMMAND, &cmd); | |
150 | if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) { | |
151 | cmd &= ~PCI_COMMAND_INTX_DISABLE; | |
152 | pci_write_config_word(pdev, PCI_COMMAND, cmd); | |
153 | } | |
154 | ||
a9047f24 | 155 | msix_pos = pdev->msix_cap; |
89e1f7d4 AW |
156 | if (msix_pos) { |
157 | u16 flags; | |
158 | u32 table; | |
159 | ||
160 | pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags); | |
161 | pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table); | |
162 | ||
508d1aa6 BH |
163 | vdev->msix_bar = table & PCI_MSIX_TABLE_BIR; |
164 | vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET; | |
89e1f7d4 AW |
165 | vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16; |
166 | } else | |
167 | vdev->msix_bar = 0xFF; | |
168 | ||
ecaa1f6a | 169 | if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev)) |
84237a82 | 170 | vdev->has_vga = true; |
84237a82 | 171 | |
9a92c509 | 172 | return 0; |
89e1f7d4 AW |
173 | } |
174 | ||
175 | static void vfio_pci_disable(struct vfio_pci_device *vdev) | |
176 | { | |
2007722a | 177 | struct pci_dev *pdev = vdev->pdev; |
89e1f7d4 AW |
178 | int bar; |
179 | ||
9c22e660 AW |
180 | /* Stop the device from further DMA */ |
181 | pci_clear_master(pdev); | |
89e1f7d4 AW |
182 | |
183 | vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE | | |
184 | VFIO_IRQ_SET_ACTION_TRIGGER, | |
185 | vdev->irq_type, 0, 0, NULL); | |
186 | ||
187 | vdev->virq_disabled = false; | |
188 | ||
189 | vfio_config_free(vdev); | |
190 | ||
89e1f7d4 AW |
191 | for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { |
192 | if (!vdev->barmap[bar]) | |
193 | continue; | |
2007722a AW |
194 | pci_iounmap(pdev, vdev->barmap[bar]); |
195 | pci_release_selected_regions(pdev, 1 << bar); | |
89e1f7d4 AW |
196 | vdev->barmap[bar] = NULL; |
197 | } | |
2007722a | 198 | |
bc4fba77 AW |
199 | vdev->needs_reset = true; |
200 | ||
2007722a AW |
201 | /* |
202 | * If we have saved state, restore it. If we can reset the device, | |
203 | * even better. Resetting with current state seems better than | |
204 | * nothing, but saving and restoring current state without reset | |
205 | * is just busy work. | |
206 | */ | |
207 | if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) { | |
208 | pr_info("%s: Couldn't reload %s saved state\n", | |
209 | __func__, dev_name(&pdev->dev)); | |
210 | ||
211 | if (!vdev->reset_works) | |
9c22e660 | 212 | goto out; |
2007722a AW |
213 | |
214 | pci_save_state(pdev); | |
215 | } | |
216 | ||
217 | /* | |
218 | * Disable INTx and MSI, presumably to avoid spurious interrupts | |
219 | * during reset. Stolen from pci_reset_function() | |
220 | */ | |
221 | pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); | |
222 | ||
d24cdbfd | 223 | /* |
890ed578 AW |
224 | * Try to reset the device. The success of this is dependent on |
225 | * being able to lock the device, which is not always possible. | |
d24cdbfd | 226 | */ |
561d72dd AW |
227 | if (vdev->reset_works && !pci_try_reset_function(pdev)) |
228 | vdev->needs_reset = false; | |
2007722a AW |
229 | |
230 | pci_restore_state(pdev); | |
9c22e660 AW |
231 | out: |
232 | pci_disable_device(pdev); | |
bc4fba77 AW |
233 | |
234 | vfio_pci_try_bus_reset(vdev); | |
6eb70187 AW |
235 | |
236 | if (!disable_idle_d3) | |
237 | pci_set_power_state(pdev, PCI_D3hot); | |
89e1f7d4 AW |
238 | } |
239 | ||
240 | static void vfio_pci_release(void *device_data) | |
241 | { | |
242 | struct vfio_pci_device *vdev = device_data; | |
243 | ||
61d79256 AW |
244 | mutex_lock(&driver_lock); |
245 | ||
246 | if (!(--vdev->refcnt)) { | |
1b69be5e | 247 | vfio_spapr_pci_eeh_release(vdev->pdev); |
89e1f7d4 | 248 | vfio_pci_disable(vdev); |
1b69be5e | 249 | } |
89e1f7d4 | 250 | |
61d79256 AW |
251 | mutex_unlock(&driver_lock); |
252 | ||
89e1f7d4 AW |
253 | module_put(THIS_MODULE); |
254 | } | |
255 | ||
256 | static int vfio_pci_open(void *device_data) | |
257 | { | |
258 | struct vfio_pci_device *vdev = device_data; | |
61d79256 | 259 | int ret = 0; |
89e1f7d4 AW |
260 | |
261 | if (!try_module_get(THIS_MODULE)) | |
262 | return -ENODEV; | |
263 | ||
61d79256 AW |
264 | mutex_lock(&driver_lock); |
265 | ||
266 | if (!vdev->refcnt) { | |
1b69be5e GS |
267 | ret = vfio_pci_enable(vdev); |
268 | if (ret) | |
269 | goto error; | |
270 | ||
9b936c96 | 271 | vfio_spapr_pci_eeh_open(vdev->pdev); |
89e1f7d4 | 272 | } |
61d79256 | 273 | vdev->refcnt++; |
1b69be5e | 274 | error: |
61d79256 AW |
275 | mutex_unlock(&driver_lock); |
276 | if (ret) | |
277 | module_put(THIS_MODULE); | |
1b69be5e | 278 | return ret; |
89e1f7d4 AW |
279 | } |
280 | ||
281 | static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type) | |
282 | { | |
283 | if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) { | |
284 | u8 pin; | |
285 | pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin); | |
1d53a3a7 | 286 | if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && pin) |
89e1f7d4 AW |
287 | return 1; |
288 | ||
289 | } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) { | |
290 | u8 pos; | |
291 | u16 flags; | |
292 | ||
a9047f24 | 293 | pos = vdev->pdev->msi_cap; |
89e1f7d4 AW |
294 | if (pos) { |
295 | pci_read_config_word(vdev->pdev, | |
296 | pos + PCI_MSI_FLAGS, &flags); | |
fd49c81f | 297 | return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1); |
89e1f7d4 AW |
298 | } |
299 | } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) { | |
300 | u8 pos; | |
301 | u16 flags; | |
302 | ||
a9047f24 | 303 | pos = vdev->pdev->msix_cap; |
89e1f7d4 AW |
304 | if (pos) { |
305 | pci_read_config_word(vdev->pdev, | |
306 | pos + PCI_MSIX_FLAGS, &flags); | |
307 | ||
308 | return (flags & PCI_MSIX_FLAGS_QSIZE) + 1; | |
309 | } | |
6140a8f5 | 310 | } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) { |
dad9f897 VMP |
311 | if (pci_is_pcie(vdev->pdev)) |
312 | return 1; | |
6140a8f5 AW |
313 | } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) { |
314 | return 1; | |
315 | } | |
89e1f7d4 AW |
316 | |
317 | return 0; | |
318 | } | |
319 | ||
8b27ee60 AW |
320 | static int vfio_pci_count_devs(struct pci_dev *pdev, void *data) |
321 | { | |
322 | (*(int *)data)++; | |
323 | return 0; | |
324 | } | |
325 | ||
326 | struct vfio_pci_fill_info { | |
327 | int max; | |
328 | int cur; | |
329 | struct vfio_pci_dependent_device *devices; | |
330 | }; | |
331 | ||
332 | static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data) | |
333 | { | |
334 | struct vfio_pci_fill_info *fill = data; | |
335 | struct iommu_group *iommu_group; | |
336 | ||
337 | if (fill->cur == fill->max) | |
338 | return -EAGAIN; /* Something changed, try again */ | |
339 | ||
340 | iommu_group = iommu_group_get(&pdev->dev); | |
341 | if (!iommu_group) | |
342 | return -EPERM; /* Cannot reset non-isolated devices */ | |
343 | ||
344 | fill->devices[fill->cur].group_id = iommu_group_id(iommu_group); | |
345 | fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus); | |
346 | fill->devices[fill->cur].bus = pdev->bus->number; | |
347 | fill->devices[fill->cur].devfn = pdev->devfn; | |
348 | fill->cur++; | |
349 | iommu_group_put(iommu_group); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | struct vfio_pci_group_entry { | |
354 | struct vfio_group *group; | |
355 | int id; | |
356 | }; | |
357 | ||
358 | struct vfio_pci_group_info { | |
359 | int count; | |
360 | struct vfio_pci_group_entry *groups; | |
361 | }; | |
362 | ||
363 | static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data) | |
364 | { | |
365 | struct vfio_pci_group_info *info = data; | |
366 | struct iommu_group *group; | |
367 | int id, i; | |
368 | ||
369 | group = iommu_group_get(&pdev->dev); | |
370 | if (!group) | |
371 | return -EPERM; | |
372 | ||
373 | id = iommu_group_id(group); | |
374 | ||
375 | for (i = 0; i < info->count; i++) | |
376 | if (info->groups[i].id == id) | |
377 | break; | |
378 | ||
379 | iommu_group_put(group); | |
380 | ||
381 | return (i == info->count) ? -EINVAL : 0; | |
382 | } | |
383 | ||
384 | static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot) | |
385 | { | |
386 | for (; pdev; pdev = pdev->bus->self) | |
387 | if (pdev->bus == slot->bus) | |
388 | return (pdev->slot == slot); | |
389 | return false; | |
390 | } | |
391 | ||
392 | struct vfio_pci_walk_info { | |
393 | int (*fn)(struct pci_dev *, void *data); | |
394 | void *data; | |
395 | struct pci_dev *pdev; | |
396 | bool slot; | |
397 | int ret; | |
398 | }; | |
399 | ||
400 | static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data) | |
401 | { | |
402 | struct vfio_pci_walk_info *walk = data; | |
403 | ||
404 | if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot)) | |
405 | walk->ret = walk->fn(pdev, walk->data); | |
406 | ||
407 | return walk->ret; | |
408 | } | |
409 | ||
410 | static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev, | |
411 | int (*fn)(struct pci_dev *, | |
412 | void *data), void *data, | |
413 | bool slot) | |
414 | { | |
415 | struct vfio_pci_walk_info walk = { | |
416 | .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0, | |
417 | }; | |
418 | ||
419 | pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk); | |
420 | ||
421 | return walk.ret; | |
422 | } | |
423 | ||
89e1f7d4 AW |
424 | static long vfio_pci_ioctl(void *device_data, |
425 | unsigned int cmd, unsigned long arg) | |
426 | { | |
427 | struct vfio_pci_device *vdev = device_data; | |
428 | unsigned long minsz; | |
429 | ||
430 | if (cmd == VFIO_DEVICE_GET_INFO) { | |
431 | struct vfio_device_info info; | |
432 | ||
433 | minsz = offsetofend(struct vfio_device_info, num_irqs); | |
434 | ||
435 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
436 | return -EFAULT; | |
437 | ||
438 | if (info.argsz < minsz) | |
439 | return -EINVAL; | |
440 | ||
441 | info.flags = VFIO_DEVICE_FLAGS_PCI; | |
442 | ||
443 | if (vdev->reset_works) | |
444 | info.flags |= VFIO_DEVICE_FLAGS_RESET; | |
445 | ||
446 | info.num_regions = VFIO_PCI_NUM_REGIONS; | |
447 | info.num_irqs = VFIO_PCI_NUM_IRQS; | |
448 | ||
449 | return copy_to_user((void __user *)arg, &info, minsz); | |
450 | ||
451 | } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { | |
452 | struct pci_dev *pdev = vdev->pdev; | |
453 | struct vfio_region_info info; | |
454 | ||
455 | minsz = offsetofend(struct vfio_region_info, offset); | |
456 | ||
457 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
458 | return -EFAULT; | |
459 | ||
460 | if (info.argsz < minsz) | |
461 | return -EINVAL; | |
462 | ||
463 | switch (info.index) { | |
464 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
465 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
466 | info.size = pdev->cfg_size; | |
467 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
468 | VFIO_REGION_INFO_FLAG_WRITE; | |
469 | break; | |
470 | case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: | |
471 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
472 | info.size = pci_resource_len(pdev, info.index); | |
473 | if (!info.size) { | |
474 | info.flags = 0; | |
475 | break; | |
476 | } | |
477 | ||
478 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
479 | VFIO_REGION_INFO_FLAG_WRITE; | |
1d53a3a7 FB |
480 | if (IS_ENABLED(CONFIG_VFIO_PCI_MMAP) && |
481 | pci_resource_flags(pdev, info.index) & | |
89e1f7d4 AW |
482 | IORESOURCE_MEM && info.size >= PAGE_SIZE) |
483 | info.flags |= VFIO_REGION_INFO_FLAG_MMAP; | |
484 | break; | |
485 | case VFIO_PCI_ROM_REGION_INDEX: | |
486 | { | |
487 | void __iomem *io; | |
488 | size_t size; | |
489 | ||
490 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
491 | info.flags = 0; | |
492 | ||
493 | /* Report the BAR size, not the ROM size */ | |
494 | info.size = pci_resource_len(pdev, info.index); | |
495 | if (!info.size) | |
496 | break; | |
497 | ||
498 | /* Is it really there? */ | |
499 | io = pci_map_rom(pdev, &size); | |
500 | if (!io || !size) { | |
501 | info.size = 0; | |
502 | break; | |
503 | } | |
504 | pci_unmap_rom(pdev, io); | |
505 | ||
506 | info.flags = VFIO_REGION_INFO_FLAG_READ; | |
507 | break; | |
508 | } | |
84237a82 AW |
509 | case VFIO_PCI_VGA_REGION_INDEX: |
510 | if (!vdev->has_vga) | |
511 | return -EINVAL; | |
512 | ||
513 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
514 | info.size = 0xc0000; | |
515 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
516 | VFIO_REGION_INFO_FLAG_WRITE; | |
517 | ||
518 | break; | |
89e1f7d4 AW |
519 | default: |
520 | return -EINVAL; | |
521 | } | |
522 | ||
523 | return copy_to_user((void __user *)arg, &info, minsz); | |
524 | ||
525 | } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { | |
526 | struct vfio_irq_info info; | |
527 | ||
528 | minsz = offsetofend(struct vfio_irq_info, count); | |
529 | ||
530 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
531 | return -EFAULT; | |
532 | ||
533 | if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) | |
534 | return -EINVAL; | |
535 | ||
dad9f897 VMP |
536 | switch (info.index) { |
537 | case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: | |
6140a8f5 | 538 | case VFIO_PCI_REQ_IRQ_INDEX: |
dad9f897 VMP |
539 | break; |
540 | case VFIO_PCI_ERR_IRQ_INDEX: | |
541 | if (pci_is_pcie(vdev->pdev)) | |
542 | break; | |
543 | /* pass thru to return error */ | |
544 | default: | |
545 | return -EINVAL; | |
546 | } | |
547 | ||
89e1f7d4 AW |
548 | info.flags = VFIO_IRQ_INFO_EVENTFD; |
549 | ||
550 | info.count = vfio_pci_get_irq_count(vdev, info.index); | |
551 | ||
552 | if (info.index == VFIO_PCI_INTX_IRQ_INDEX) | |
553 | info.flags |= (VFIO_IRQ_INFO_MASKABLE | | |
554 | VFIO_IRQ_INFO_AUTOMASKED); | |
555 | else | |
556 | info.flags |= VFIO_IRQ_INFO_NORESIZE; | |
557 | ||
558 | return copy_to_user((void __user *)arg, &info, minsz); | |
559 | ||
560 | } else if (cmd == VFIO_DEVICE_SET_IRQS) { | |
561 | struct vfio_irq_set hdr; | |
562 | u8 *data = NULL; | |
563 | int ret = 0; | |
564 | ||
565 | minsz = offsetofend(struct vfio_irq_set, count); | |
566 | ||
567 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
568 | return -EFAULT; | |
569 | ||
570 | if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS || | |
571 | hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK | | |
572 | VFIO_IRQ_SET_ACTION_TYPE_MASK)) | |
573 | return -EINVAL; | |
574 | ||
575 | if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) { | |
576 | size_t size; | |
904c680c | 577 | int max = vfio_pci_get_irq_count(vdev, hdr.index); |
89e1f7d4 AW |
578 | |
579 | if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL) | |
580 | size = sizeof(uint8_t); | |
581 | else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD) | |
582 | size = sizeof(int32_t); | |
583 | else | |
584 | return -EINVAL; | |
585 | ||
586 | if (hdr.argsz - minsz < hdr.count * size || | |
904c680c | 587 | hdr.start >= max || hdr.start + hdr.count > max) |
89e1f7d4 AW |
588 | return -EINVAL; |
589 | ||
3a1f7041 FW |
590 | data = memdup_user((void __user *)(arg + minsz), |
591 | hdr.count * size); | |
592 | if (IS_ERR(data)) | |
593 | return PTR_ERR(data); | |
89e1f7d4 AW |
594 | } |
595 | ||
596 | mutex_lock(&vdev->igate); | |
597 | ||
598 | ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index, | |
599 | hdr.start, hdr.count, data); | |
600 | ||
601 | mutex_unlock(&vdev->igate); | |
602 | kfree(data); | |
603 | ||
604 | return ret; | |
605 | ||
8b27ee60 | 606 | } else if (cmd == VFIO_DEVICE_RESET) { |
89e1f7d4 | 607 | return vdev->reset_works ? |
890ed578 | 608 | pci_try_reset_function(vdev->pdev) : -EINVAL; |
89e1f7d4 | 609 | |
8b27ee60 AW |
610 | } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) { |
611 | struct vfio_pci_hot_reset_info hdr; | |
612 | struct vfio_pci_fill_info fill = { 0 }; | |
613 | struct vfio_pci_dependent_device *devices = NULL; | |
614 | bool slot = false; | |
615 | int ret = 0; | |
616 | ||
617 | minsz = offsetofend(struct vfio_pci_hot_reset_info, count); | |
618 | ||
619 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
620 | return -EFAULT; | |
621 | ||
622 | if (hdr.argsz < minsz) | |
623 | return -EINVAL; | |
624 | ||
625 | hdr.flags = 0; | |
626 | ||
627 | /* Can we do a slot or bus reset or neither? */ | |
628 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
629 | slot = true; | |
630 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
631 | return -ENODEV; | |
632 | ||
633 | /* How many devices are affected? */ | |
634 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
635 | vfio_pci_count_devs, | |
636 | &fill.max, slot); | |
637 | if (ret) | |
638 | return ret; | |
639 | ||
640 | WARN_ON(!fill.max); /* Should always be at least one */ | |
641 | ||
642 | /* | |
643 | * If there's enough space, fill it now, otherwise return | |
644 | * -ENOSPC and the number of devices affected. | |
645 | */ | |
646 | if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) { | |
647 | ret = -ENOSPC; | |
648 | hdr.count = fill.max; | |
649 | goto reset_info_exit; | |
650 | } | |
651 | ||
652 | devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL); | |
653 | if (!devices) | |
654 | return -ENOMEM; | |
655 | ||
656 | fill.devices = devices; | |
657 | ||
658 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
659 | vfio_pci_fill_devs, | |
660 | &fill, slot); | |
661 | ||
662 | /* | |
663 | * If a device was removed between counting and filling, | |
664 | * we may come up short of fill.max. If a device was | |
665 | * added, we'll have a return of -EAGAIN above. | |
666 | */ | |
667 | if (!ret) | |
668 | hdr.count = fill.cur; | |
669 | ||
670 | reset_info_exit: | |
671 | if (copy_to_user((void __user *)arg, &hdr, minsz)) | |
672 | ret = -EFAULT; | |
673 | ||
674 | if (!ret) { | |
675 | if (copy_to_user((void __user *)(arg + minsz), devices, | |
676 | hdr.count * sizeof(*devices))) | |
677 | ret = -EFAULT; | |
678 | } | |
679 | ||
680 | kfree(devices); | |
681 | return ret; | |
682 | ||
683 | } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) { | |
684 | struct vfio_pci_hot_reset hdr; | |
685 | int32_t *group_fds; | |
686 | struct vfio_pci_group_entry *groups; | |
687 | struct vfio_pci_group_info info; | |
688 | bool slot = false; | |
689 | int i, count = 0, ret = 0; | |
690 | ||
691 | minsz = offsetofend(struct vfio_pci_hot_reset, count); | |
692 | ||
693 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
694 | return -EFAULT; | |
695 | ||
696 | if (hdr.argsz < minsz || hdr.flags) | |
697 | return -EINVAL; | |
698 | ||
699 | /* Can we do a slot or bus reset or neither? */ | |
700 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
701 | slot = true; | |
702 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
703 | return -ENODEV; | |
704 | ||
705 | /* | |
706 | * We can't let userspace give us an arbitrarily large | |
707 | * buffer to copy, so verify how many we think there | |
708 | * could be. Note groups can have multiple devices so | |
709 | * one group per device is the max. | |
710 | */ | |
711 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
712 | vfio_pci_count_devs, | |
713 | &count, slot); | |
714 | if (ret) | |
715 | return ret; | |
716 | ||
717 | /* Somewhere between 1 and count is OK */ | |
718 | if (!hdr.count || hdr.count > count) | |
719 | return -EINVAL; | |
720 | ||
721 | group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL); | |
722 | groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL); | |
723 | if (!group_fds || !groups) { | |
724 | kfree(group_fds); | |
725 | kfree(groups); | |
726 | return -ENOMEM; | |
727 | } | |
728 | ||
729 | if (copy_from_user(group_fds, (void __user *)(arg + minsz), | |
730 | hdr.count * sizeof(*group_fds))) { | |
731 | kfree(group_fds); | |
732 | kfree(groups); | |
733 | return -EFAULT; | |
734 | } | |
735 | ||
736 | /* | |
737 | * For each group_fd, get the group through the vfio external | |
738 | * user interface and store the group and iommu ID. This | |
739 | * ensures the group is held across the reset. | |
740 | */ | |
741 | for (i = 0; i < hdr.count; i++) { | |
742 | struct vfio_group *group; | |
743 | struct fd f = fdget(group_fds[i]); | |
744 | if (!f.file) { | |
745 | ret = -EBADF; | |
746 | break; | |
747 | } | |
748 | ||
749 | group = vfio_group_get_external_user(f.file); | |
750 | fdput(f); | |
751 | if (IS_ERR(group)) { | |
752 | ret = PTR_ERR(group); | |
753 | break; | |
754 | } | |
755 | ||
756 | groups[i].group = group; | |
757 | groups[i].id = vfio_external_user_iommu_id(group); | |
758 | } | |
759 | ||
760 | kfree(group_fds); | |
761 | ||
762 | /* release reference to groups on error */ | |
763 | if (ret) | |
764 | goto hot_reset_release; | |
765 | ||
766 | info.count = hdr.count; | |
767 | info.groups = groups; | |
768 | ||
769 | /* | |
770 | * Test whether all the affected devices are contained | |
771 | * by the set of groups provided by the user. | |
772 | */ | |
773 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
774 | vfio_pci_validate_devs, | |
775 | &info, slot); | |
776 | if (!ret) | |
777 | /* User has access, do the reset */ | |
890ed578 AW |
778 | ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : |
779 | pci_try_reset_bus(vdev->pdev->bus); | |
8b27ee60 AW |
780 | |
781 | hot_reset_release: | |
782 | for (i--; i >= 0; i--) | |
783 | vfio_group_put_external_user(groups[i].group); | |
784 | ||
785 | kfree(groups); | |
786 | return ret; | |
787 | } | |
788 | ||
89e1f7d4 AW |
789 | return -ENOTTY; |
790 | } | |
791 | ||
5b279a11 AW |
792 | static ssize_t vfio_pci_rw(void *device_data, char __user *buf, |
793 | size_t count, loff_t *ppos, bool iswrite) | |
89e1f7d4 AW |
794 | { |
795 | unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); | |
796 | struct vfio_pci_device *vdev = device_data; | |
89e1f7d4 AW |
797 | |
798 | if (index >= VFIO_PCI_NUM_REGIONS) | |
799 | return -EINVAL; | |
800 | ||
5b279a11 AW |
801 | switch (index) { |
802 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
906ee99d AW |
803 | return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite); |
804 | ||
5b279a11 AW |
805 | case VFIO_PCI_ROM_REGION_INDEX: |
806 | if (iswrite) | |
807 | return -EINVAL; | |
906ee99d | 808 | return vfio_pci_bar_rw(vdev, buf, count, ppos, false); |
89e1f7d4 | 809 | |
5b279a11 | 810 | case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: |
906ee99d | 811 | return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); |
84237a82 AW |
812 | |
813 | case VFIO_PCI_VGA_REGION_INDEX: | |
814 | return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); | |
5b279a11 AW |
815 | } |
816 | ||
89e1f7d4 AW |
817 | return -EINVAL; |
818 | } | |
819 | ||
5b279a11 AW |
820 | static ssize_t vfio_pci_read(void *device_data, char __user *buf, |
821 | size_t count, loff_t *ppos) | |
822 | { | |
906ee99d AW |
823 | if (!count) |
824 | return 0; | |
825 | ||
5b279a11 AW |
826 | return vfio_pci_rw(device_data, buf, count, ppos, false); |
827 | } | |
828 | ||
89e1f7d4 AW |
829 | static ssize_t vfio_pci_write(void *device_data, const char __user *buf, |
830 | size_t count, loff_t *ppos) | |
831 | { | |
906ee99d AW |
832 | if (!count) |
833 | return 0; | |
834 | ||
835 | return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true); | |
89e1f7d4 AW |
836 | } |
837 | ||
838 | static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) | |
839 | { | |
840 | struct vfio_pci_device *vdev = device_data; | |
841 | struct pci_dev *pdev = vdev->pdev; | |
842 | unsigned int index; | |
34002f54 | 843 | u64 phys_len, req_len, pgoff, req_start; |
89e1f7d4 AW |
844 | int ret; |
845 | ||
846 | index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); | |
847 | ||
848 | if (vma->vm_end < vma->vm_start) | |
849 | return -EINVAL; | |
850 | if ((vma->vm_flags & VM_SHARED) == 0) | |
851 | return -EINVAL; | |
852 | if (index >= VFIO_PCI_ROM_REGION_INDEX) | |
853 | return -EINVAL; | |
854 | if (!(pci_resource_flags(pdev, index) & IORESOURCE_MEM)) | |
855 | return -EINVAL; | |
856 | ||
857 | phys_len = pci_resource_len(pdev, index); | |
858 | req_len = vma->vm_end - vma->vm_start; | |
859 | pgoff = vma->vm_pgoff & | |
860 | ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); | |
861 | req_start = pgoff << PAGE_SHIFT; | |
862 | ||
863 | if (phys_len < PAGE_SIZE || req_start + req_len > phys_len) | |
864 | return -EINVAL; | |
865 | ||
866 | if (index == vdev->msix_bar) { | |
867 | /* | |
868 | * Disallow mmaps overlapping the MSI-X table; users don't | |
869 | * get to touch this directly. We could find somewhere | |
870 | * else to map the overlap, but page granularity is only | |
871 | * a recommendation, not a requirement, so the user needs | |
872 | * to know which bits are real. Requiring them to mmap | |
873 | * around the table makes that clear. | |
874 | */ | |
875 | ||
876 | /* If neither entirely above nor below, then it overlaps */ | |
877 | if (!(req_start >= vdev->msix_offset + vdev->msix_size || | |
878 | req_start + req_len <= vdev->msix_offset)) | |
879 | return -EINVAL; | |
880 | } | |
881 | ||
882 | /* | |
883 | * Even though we don't make use of the barmap for the mmap, | |
884 | * we need to request the region and the barmap tracks that. | |
885 | */ | |
886 | if (!vdev->barmap[index]) { | |
887 | ret = pci_request_selected_regions(pdev, | |
888 | 1 << index, "vfio-pci"); | |
889 | if (ret) | |
890 | return ret; | |
891 | ||
892 | vdev->barmap[index] = pci_iomap(pdev, index, 0); | |
893 | } | |
894 | ||
895 | vma->vm_private_data = vdev; | |
89e1f7d4 | 896 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
34002f54 | 897 | vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff; |
89e1f7d4 | 898 | |
34002f54 | 899 | return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
89e1f7d4 AW |
900 | req_len, vma->vm_page_prot); |
901 | } | |
902 | ||
6140a8f5 AW |
903 | static void vfio_pci_request(void *device_data, unsigned int count) |
904 | { | |
905 | struct vfio_pci_device *vdev = device_data; | |
906 | ||
907 | mutex_lock(&vdev->igate); | |
908 | ||
909 | if (vdev->req_trigger) { | |
5f55d2ae AW |
910 | if (!(count % 10)) |
911 | dev_notice_ratelimited(&vdev->pdev->dev, | |
912 | "Relaying device request to user (#%u)\n", | |
913 | count); | |
6140a8f5 | 914 | eventfd_signal(vdev->req_trigger, 1); |
5f55d2ae AW |
915 | } else if (count == 0) { |
916 | dev_warn(&vdev->pdev->dev, | |
917 | "No device request channel registered, blocked until released by user\n"); | |
6140a8f5 AW |
918 | } |
919 | ||
920 | mutex_unlock(&vdev->igate); | |
921 | } | |
922 | ||
89e1f7d4 AW |
923 | static const struct vfio_device_ops vfio_pci_ops = { |
924 | .name = "vfio-pci", | |
925 | .open = vfio_pci_open, | |
926 | .release = vfio_pci_release, | |
927 | .ioctl = vfio_pci_ioctl, | |
928 | .read = vfio_pci_read, | |
929 | .write = vfio_pci_write, | |
930 | .mmap = vfio_pci_mmap, | |
6140a8f5 | 931 | .request = vfio_pci_request, |
89e1f7d4 AW |
932 | }; |
933 | ||
934 | static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) | |
935 | { | |
89e1f7d4 AW |
936 | struct vfio_pci_device *vdev; |
937 | struct iommu_group *group; | |
938 | int ret; | |
939 | ||
7c2e211f | 940 | if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL) |
89e1f7d4 AW |
941 | return -EINVAL; |
942 | ||
033291ec | 943 | group = vfio_iommu_group_get(&pdev->dev); |
89e1f7d4 AW |
944 | if (!group) |
945 | return -EINVAL; | |
946 | ||
947 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); | |
948 | if (!vdev) { | |
033291ec | 949 | vfio_iommu_group_put(group, &pdev->dev); |
89e1f7d4 AW |
950 | return -ENOMEM; |
951 | } | |
952 | ||
953 | vdev->pdev = pdev; | |
954 | vdev->irq_type = VFIO_PCI_NUM_IRQS; | |
955 | mutex_init(&vdev->igate); | |
956 | spin_lock_init(&vdev->irqlock); | |
89e1f7d4 AW |
957 | |
958 | ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); | |
959 | if (ret) { | |
033291ec | 960 | vfio_iommu_group_put(group, &pdev->dev); |
89e1f7d4 | 961 | kfree(vdev); |
5a0ff177 | 962 | return ret; |
89e1f7d4 AW |
963 | } |
964 | ||
ecaa1f6a AW |
965 | if (vfio_pci_is_vga(pdev)) { |
966 | vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode); | |
967 | vga_set_legacy_decoding(pdev, | |
968 | vfio_pci_set_vga_decode(vdev, false)); | |
969 | } | |
970 | ||
6eb70187 AW |
971 | if (!disable_idle_d3) { |
972 | /* | |
973 | * pci-core sets the device power state to an unknown value at | |
974 | * bootup and after being removed from a driver. The only | |
975 | * transition it allows from this unknown state is to D0, which | |
976 | * typically happens when a driver calls pci_enable_device(). | |
977 | * We're not ready to enable the device yet, but we do want to | |
978 | * be able to get to D3. Therefore first do a D0 transition | |
979 | * before going to D3. | |
980 | */ | |
981 | pci_set_power_state(pdev, PCI_D0); | |
982 | pci_set_power_state(pdev, PCI_D3hot); | |
983 | } | |
984 | ||
89e1f7d4 AW |
985 | return ret; |
986 | } | |
987 | ||
988 | static void vfio_pci_remove(struct pci_dev *pdev) | |
989 | { | |
990 | struct vfio_pci_device *vdev; | |
991 | ||
992 | vdev = vfio_del_group_dev(&pdev->dev); | |
ecaa1f6a AW |
993 | if (!vdev) |
994 | return; | |
995 | ||
033291ec | 996 | vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev); |
ecaa1f6a AW |
997 | kfree(vdev); |
998 | ||
999 | if (vfio_pci_is_vga(pdev)) { | |
1000 | vga_client_register(pdev, NULL, NULL, NULL); | |
1001 | vga_set_legacy_decoding(pdev, | |
1002 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | | |
1003 | VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); | |
61d79256 | 1004 | } |
6eb70187 AW |
1005 | |
1006 | if (!disable_idle_d3) | |
1007 | pci_set_power_state(pdev, PCI_D0); | |
89e1f7d4 AW |
1008 | } |
1009 | ||
dad9f897 VMP |
1010 | static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, |
1011 | pci_channel_state_t state) | |
1012 | { | |
1013 | struct vfio_pci_device *vdev; | |
1014 | struct vfio_device *device; | |
1015 | ||
1016 | device = vfio_device_get_from_dev(&pdev->dev); | |
1017 | if (device == NULL) | |
1018 | return PCI_ERS_RESULT_DISCONNECT; | |
1019 | ||
1020 | vdev = vfio_device_data(device); | |
1021 | if (vdev == NULL) { | |
1022 | vfio_device_put(device); | |
1023 | return PCI_ERS_RESULT_DISCONNECT; | |
1024 | } | |
1025 | ||
3be3a074 AW |
1026 | mutex_lock(&vdev->igate); |
1027 | ||
dad9f897 VMP |
1028 | if (vdev->err_trigger) |
1029 | eventfd_signal(vdev->err_trigger, 1); | |
1030 | ||
3be3a074 AW |
1031 | mutex_unlock(&vdev->igate); |
1032 | ||
dad9f897 VMP |
1033 | vfio_device_put(device); |
1034 | ||
1035 | return PCI_ERS_RESULT_CAN_RECOVER; | |
1036 | } | |
1037 | ||
1038 | static struct pci_error_handlers vfio_err_handlers = { | |
1039 | .error_detected = vfio_pci_aer_err_detected, | |
1040 | }; | |
1041 | ||
89e1f7d4 AW |
1042 | static struct pci_driver vfio_pci_driver = { |
1043 | .name = "vfio-pci", | |
1044 | .id_table = NULL, /* only dynamic ids */ | |
1045 | .probe = vfio_pci_probe, | |
1046 | .remove = vfio_pci_remove, | |
dad9f897 | 1047 | .err_handler = &vfio_err_handlers, |
89e1f7d4 AW |
1048 | }; |
1049 | ||
93899a67 AW |
1050 | struct vfio_devices { |
1051 | struct vfio_device **devices; | |
1052 | int cur_index; | |
1053 | int max_index; | |
1054 | }; | |
bc4fba77 | 1055 | |
93899a67 | 1056 | static int vfio_pci_get_devs(struct pci_dev *pdev, void *data) |
bc4fba77 | 1057 | { |
93899a67 | 1058 | struct vfio_devices *devs = data; |
20f30017 | 1059 | struct vfio_device *device; |
bc4fba77 | 1060 | |
93899a67 AW |
1061 | if (devs->cur_index == devs->max_index) |
1062 | return -ENOSPC; | |
bc4fba77 | 1063 | |
20f30017 AW |
1064 | device = vfio_device_get_from_dev(&pdev->dev); |
1065 | if (!device) | |
93899a67 | 1066 | return -EINVAL; |
bc4fba77 | 1067 | |
20f30017 AW |
1068 | if (pci_dev_driver(pdev) != &vfio_pci_driver) { |
1069 | vfio_device_put(device); | |
1070 | return -EBUSY; | |
1071 | } | |
1072 | ||
1073 | devs->devices[devs->cur_index++] = device; | |
bc4fba77 AW |
1074 | return 0; |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Attempt to do a bus/slot reset if there are devices affected by a reset for | |
1079 | * this device that are needs_reset and all of the affected devices are unused | |
93899a67 AW |
1080 | * (!refcnt). Callers are required to hold driver_lock when calling this to |
1081 | * prevent device opens and concurrent bus reset attempts. We prevent device | |
1082 | * unbinds by acquiring and holding a reference to the vfio_device. | |
1083 | * | |
1084 | * NB: vfio-core considers a group to be viable even if some devices are | |
1085 | * bound to drivers like pci-stub or pcieport. Here we require all devices | |
1086 | * to be bound to vfio_pci since that's the only way we can be sure they | |
1087 | * stay put. | |
bc4fba77 AW |
1088 | */ |
1089 | static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) | |
1090 | { | |
93899a67 AW |
1091 | struct vfio_devices devs = { .cur_index = 0 }; |
1092 | int i = 0, ret = -EINVAL; | |
bc4fba77 | 1093 | bool needs_reset = false, slot = false; |
93899a67 | 1094 | struct vfio_pci_device *tmp; |
bc4fba77 AW |
1095 | |
1096 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
1097 | slot = true; | |
1098 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
1099 | return; | |
1100 | ||
93899a67 AW |
1101 | if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs, |
1102 | &i, slot) || !i) | |
bc4fba77 AW |
1103 | return; |
1104 | ||
93899a67 AW |
1105 | devs.max_index = i; |
1106 | devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL); | |
1107 | if (!devs.devices) | |
bc4fba77 AW |
1108 | return; |
1109 | ||
93899a67 AW |
1110 | if (vfio_pci_for_each_slot_or_bus(vdev->pdev, |
1111 | vfio_pci_get_devs, &devs, slot)) | |
1112 | goto put_devs; | |
1113 | ||
1114 | for (i = 0; i < devs.cur_index; i++) { | |
1115 | tmp = vfio_device_data(devs.devices[i]); | |
1116 | if (tmp->needs_reset) | |
1117 | needs_reset = true; | |
1118 | if (tmp->refcnt) | |
1119 | goto put_devs; | |
1120 | } | |
1121 | ||
1122 | if (needs_reset) | |
1123 | ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : | |
1124 | pci_try_reset_bus(vdev->pdev->bus); | |
1125 | ||
1126 | put_devs: | |
1127 | for (i = 0; i < devs.cur_index; i++) { | |
6eb70187 AW |
1128 | tmp = vfio_device_data(devs.devices[i]); |
1129 | if (!ret) | |
93899a67 | 1130 | tmp->needs_reset = false; |
6eb70187 AW |
1131 | |
1132 | if (!tmp->refcnt && !disable_idle_d3) | |
1133 | pci_set_power_state(tmp->pdev, PCI_D3hot); | |
1134 | ||
93899a67 AW |
1135 | vfio_device_put(devs.devices[i]); |
1136 | } | |
1137 | ||
1138 | kfree(devs.devices); | |
bc4fba77 AW |
1139 | } |
1140 | ||
89e1f7d4 AW |
1141 | static void __exit vfio_pci_cleanup(void) |
1142 | { | |
1143 | pci_unregister_driver(&vfio_pci_driver); | |
89e1f7d4 AW |
1144 | vfio_pci_uninit_perm_bits(); |
1145 | } | |
1146 | ||
80c7e8cc AW |
1147 | static void __init vfio_pci_fill_ids(void) |
1148 | { | |
1149 | char *p, *id; | |
1150 | int rc; | |
1151 | ||
1152 | /* no ids passed actually */ | |
1153 | if (ids[0] == '\0') | |
1154 | return; | |
1155 | ||
1156 | /* add ids specified in the module parameter */ | |
1157 | p = ids; | |
1158 | while ((id = strsep(&p, ","))) { | |
1159 | unsigned int vendor, device, subvendor = PCI_ANY_ID, | |
1160 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
1161 | int fields; | |
1162 | ||
1163 | if (!strlen(id)) | |
1164 | continue; | |
1165 | ||
1166 | fields = sscanf(id, "%x:%x:%x:%x:%x:%x", | |
1167 | &vendor, &device, &subvendor, &subdevice, | |
1168 | &class, &class_mask); | |
1169 | ||
1170 | if (fields < 2) { | |
1171 | pr_warn("invalid id string \"%s\"\n", id); | |
1172 | continue; | |
1173 | } | |
1174 | ||
1175 | rc = pci_add_dynid(&vfio_pci_driver, vendor, device, | |
1176 | subvendor, subdevice, class, class_mask, 0); | |
1177 | if (rc) | |
1178 | pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", | |
1179 | vendor, device, subvendor, subdevice, | |
1180 | class, class_mask, rc); | |
1181 | else | |
1182 | pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", | |
1183 | vendor, device, subvendor, subdevice, | |
1184 | class, class_mask); | |
1185 | } | |
1186 | } | |
1187 | ||
89e1f7d4 AW |
1188 | static int __init vfio_pci_init(void) |
1189 | { | |
1190 | int ret; | |
1191 | ||
1192 | /* Allocate shared config space permision data used by all devices */ | |
1193 | ret = vfio_pci_init_perm_bits(); | |
1194 | if (ret) | |
1195 | return ret; | |
1196 | ||
89e1f7d4 AW |
1197 | /* Register and scan for devices */ |
1198 | ret = pci_register_driver(&vfio_pci_driver); | |
1199 | if (ret) | |
1200 | goto out_driver; | |
1201 | ||
80c7e8cc AW |
1202 | vfio_pci_fill_ids(); |
1203 | ||
89e1f7d4 AW |
1204 | return 0; |
1205 | ||
89e1f7d4 AW |
1206 | out_driver: |
1207 | vfio_pci_uninit_perm_bits(); | |
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | module_init(vfio_pci_init); | |
1212 | module_exit(vfio_pci_cleanup); | |
1213 | ||
1214 | MODULE_VERSION(DRIVER_VERSION); | |
1215 | MODULE_LICENSE("GPL v2"); | |
1216 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1217 | MODULE_DESCRIPTION(DRIVER_DESC); |