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1 | /* | |
2 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. | |
3 | * Author: Alex Williamson <alex.williamson@redhat.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * Derived from original vfio: | |
10 | * Copyright 2010 Cisco Systems, Inc. All rights reserved. | |
11 | * Author: Tom Lyon, pugs@cisco.com | |
12 | */ | |
13 | ||
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
16 | #include <linux/device.h> | |
17 | #include <linux/eventfd.h> | |
18 | #include <linux/file.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/iommu.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/notifier.h> | |
24 | #include <linux/pci.h> | |
25 | #include <linux/pm_runtime.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/uaccess.h> | |
29 | #include <linux/vfio.h> | |
30 | #include <linux/vgaarb.h> | |
31 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
58 | static DEFINE_MUTEX(driver_lock); | |
59 | ||
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 | ||
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 | ||
113 | static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev) | |
114 | { | |
115 | struct resource *res; | |
116 | int bar; | |
117 | struct vfio_pci_dummy_resource *dummy_res; | |
118 | ||
119 | INIT_LIST_HEAD(&vdev->dummy_resources_list); | |
120 | ||
121 | for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { | |
122 | res = vdev->pdev->resource + bar; | |
123 | ||
124 | if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP)) | |
125 | goto no_mmap; | |
126 | ||
127 | if (!(res->flags & IORESOURCE_MEM)) | |
128 | goto no_mmap; | |
129 | ||
130 | /* | |
131 | * The PCI core shouldn't set up a resource with a | |
132 | * type but zero size. But there may be bugs that | |
133 | * cause us to do that. | |
134 | */ | |
135 | if (!resource_size(res)) | |
136 | goto no_mmap; | |
137 | ||
138 | if (resource_size(res) >= PAGE_SIZE) { | |
139 | vdev->bar_mmap_supported[bar] = true; | |
140 | continue; | |
141 | } | |
142 | ||
143 | if (!(res->start & ~PAGE_MASK)) { | |
144 | /* | |
145 | * Add a dummy resource to reserve the remainder | |
146 | * of the exclusive page in case that hot-add | |
147 | * device's bar is assigned into it. | |
148 | */ | |
149 | dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL); | |
150 | if (dummy_res == NULL) | |
151 | goto no_mmap; | |
152 | ||
153 | dummy_res->resource.name = "vfio sub-page reserved"; | |
154 | dummy_res->resource.start = res->end + 1; | |
155 | dummy_res->resource.end = res->start + PAGE_SIZE - 1; | |
156 | dummy_res->resource.flags = res->flags; | |
157 | if (request_resource(res->parent, | |
158 | &dummy_res->resource)) { | |
159 | kfree(dummy_res); | |
160 | goto no_mmap; | |
161 | } | |
162 | dummy_res->index = bar; | |
163 | list_add(&dummy_res->res_next, | |
164 | &vdev->dummy_resources_list); | |
165 | vdev->bar_mmap_supported[bar] = true; | |
166 | continue; | |
167 | } | |
168 | /* | |
169 | * Here we don't handle the case when the BAR is not page | |
170 | * aligned because we can't expect the BAR will be | |
171 | * assigned into the same location in a page in guest | |
172 | * when we passthrough the BAR. And it's hard to access | |
173 | * this BAR in userspace because we have no way to get | |
174 | * the BAR's location in a page. | |
175 | */ | |
176 | no_mmap: | |
177 | vdev->bar_mmap_supported[bar] = false; | |
178 | } | |
179 | } | |
180 | ||
181 | static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev); | |
182 | static void vfio_pci_disable(struct vfio_pci_device *vdev); | |
183 | ||
184 | /* | |
185 | * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND | |
186 | * _and_ the ability detect when the device is asserting INTx via PCI_STATUS. | |
187 | * If a device implements the former but not the latter we would typically | |
188 | * expect broken_intx_masking be set and require an exclusive interrupt. | |
189 | * However since we do have control of the device's ability to assert INTx, | |
190 | * we can instead pretend that the device does not implement INTx, virtualizing | |
191 | * the pin register to report zero and maintaining DisINTx set on the host. | |
192 | */ | |
193 | static bool vfio_pci_nointx(struct pci_dev *pdev) | |
194 | { | |
195 | switch (pdev->vendor) { | |
196 | case PCI_VENDOR_ID_INTEL: | |
197 | switch (pdev->device) { | |
198 | /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */ | |
199 | case 0x1572: | |
200 | case 0x1574: | |
201 | case 0x1580 ... 0x1581: | |
202 | case 0x1583 ... 0x158b: | |
203 | case 0x37d0 ... 0x37d2: | |
204 | return true; | |
205 | default: | |
206 | return false; | |
207 | } | |
208 | } | |
209 | ||
210 | return false; | |
211 | } | |
212 | ||
213 | static int vfio_pci_enable(struct vfio_pci_device *vdev) | |
214 | { | |
215 | struct pci_dev *pdev = vdev->pdev; | |
216 | int ret; | |
217 | u16 cmd; | |
218 | u8 msix_pos; | |
219 | ||
220 | pci_set_power_state(pdev, PCI_D0); | |
221 | ||
222 | /* Don't allow our initial saved state to include busmaster */ | |
223 | pci_clear_master(pdev); | |
224 | ||
225 | ret = pci_enable_device(pdev); | |
226 | if (ret) | |
227 | return ret; | |
228 | ||
229 | /* If reset fails because of the device lock, fail this path entirely */ | |
230 | ret = pci_try_reset_function(pdev); | |
231 | if (ret == -EAGAIN) { | |
232 | pci_disable_device(pdev); | |
233 | return ret; | |
234 | } | |
235 | ||
236 | vdev->reset_works = !ret; | |
237 | pci_save_state(pdev); | |
238 | vdev->pci_saved_state = pci_store_saved_state(pdev); | |
239 | if (!vdev->pci_saved_state) | |
240 | pr_debug("%s: Couldn't store %s saved state\n", | |
241 | __func__, dev_name(&pdev->dev)); | |
242 | ||
243 | if (likely(!nointxmask)) { | |
244 | if (vfio_pci_nointx(pdev)) { | |
245 | dev_info(&pdev->dev, "Masking broken INTx support\n"); | |
246 | vdev->nointx = true; | |
247 | pci_intx(pdev, 0); | |
248 | } else | |
249 | vdev->pci_2_3 = pci_intx_mask_supported(pdev); | |
250 | } | |
251 | ||
252 | pci_read_config_word(pdev, PCI_COMMAND, &cmd); | |
253 | if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) { | |
254 | cmd &= ~PCI_COMMAND_INTX_DISABLE; | |
255 | pci_write_config_word(pdev, PCI_COMMAND, cmd); | |
256 | } | |
257 | ||
258 | ret = vfio_config_init(vdev); | |
259 | if (ret) { | |
260 | kfree(vdev->pci_saved_state); | |
261 | vdev->pci_saved_state = NULL; | |
262 | pci_disable_device(pdev); | |
263 | return ret; | |
264 | } | |
265 | ||
266 | msix_pos = pdev->msix_cap; | |
267 | if (msix_pos) { | |
268 | u16 flags; | |
269 | u32 table; | |
270 | ||
271 | pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags); | |
272 | pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table); | |
273 | ||
274 | vdev->msix_bar = table & PCI_MSIX_TABLE_BIR; | |
275 | vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET; | |
276 | vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16; | |
277 | } else | |
278 | vdev->msix_bar = 0xFF; | |
279 | ||
280 | if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev)) | |
281 | vdev->has_vga = true; | |
282 | ||
283 | ||
284 | if (vfio_pci_is_vga(pdev) && | |
285 | pdev->vendor == PCI_VENDOR_ID_INTEL && | |
286 | IS_ENABLED(CONFIG_VFIO_PCI_IGD)) { | |
287 | ret = vfio_pci_igd_init(vdev); | |
288 | if (ret) { | |
289 | dev_warn(&vdev->pdev->dev, | |
290 | "Failed to setup Intel IGD regions\n"); | |
291 | vfio_pci_disable(vdev); | |
292 | return ret; | |
293 | } | |
294 | } | |
295 | ||
296 | vfio_pci_probe_mmaps(vdev); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | static void vfio_pci_disable(struct vfio_pci_device *vdev) | |
302 | { | |
303 | struct pci_dev *pdev = vdev->pdev; | |
304 | struct vfio_pci_dummy_resource *dummy_res, *tmp; | |
305 | int i, bar; | |
306 | ||
307 | /* Stop the device from further DMA */ | |
308 | pci_clear_master(pdev); | |
309 | ||
310 | vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE | | |
311 | VFIO_IRQ_SET_ACTION_TRIGGER, | |
312 | vdev->irq_type, 0, 0, NULL); | |
313 | ||
314 | vdev->virq_disabled = false; | |
315 | ||
316 | for (i = 0; i < vdev->num_regions; i++) | |
317 | vdev->region[i].ops->release(vdev, &vdev->region[i]); | |
318 | ||
319 | vdev->num_regions = 0; | |
320 | kfree(vdev->region); | |
321 | vdev->region = NULL; /* don't krealloc a freed pointer */ | |
322 | ||
323 | vfio_config_free(vdev); | |
324 | ||
325 | for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { | |
326 | if (!vdev->barmap[bar]) | |
327 | continue; | |
328 | pci_iounmap(pdev, vdev->barmap[bar]); | |
329 | pci_release_selected_regions(pdev, 1 << bar); | |
330 | vdev->barmap[bar] = NULL; | |
331 | } | |
332 | ||
333 | list_for_each_entry_safe(dummy_res, tmp, | |
334 | &vdev->dummy_resources_list, res_next) { | |
335 | list_del(&dummy_res->res_next); | |
336 | release_resource(&dummy_res->resource); | |
337 | kfree(dummy_res); | |
338 | } | |
339 | ||
340 | vdev->needs_reset = true; | |
341 | ||
342 | /* | |
343 | * If we have saved state, restore it. If we can reset the device, | |
344 | * even better. Resetting with current state seems better than | |
345 | * nothing, but saving and restoring current state without reset | |
346 | * is just busy work. | |
347 | */ | |
348 | if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) { | |
349 | pr_info("%s: Couldn't reload %s saved state\n", | |
350 | __func__, dev_name(&pdev->dev)); | |
351 | ||
352 | if (!vdev->reset_works) | |
353 | goto out; | |
354 | ||
355 | pci_save_state(pdev); | |
356 | } | |
357 | ||
358 | /* | |
359 | * Disable INTx and MSI, presumably to avoid spurious interrupts | |
360 | * during reset. Stolen from pci_reset_function() | |
361 | */ | |
362 | pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); | |
363 | ||
364 | /* | |
365 | * Try to reset the device. The success of this is dependent on | |
366 | * being able to lock the device, which is not always possible. | |
367 | */ | |
368 | if (vdev->reset_works && !pci_try_reset_function(pdev)) | |
369 | vdev->needs_reset = false; | |
370 | ||
371 | pci_restore_state(pdev); | |
372 | out: | |
373 | pci_disable_device(pdev); | |
374 | ||
375 | vfio_pci_try_bus_reset(vdev); | |
376 | ||
377 | if (!disable_idle_d3) | |
378 | pci_set_power_state(pdev, PCI_D3hot); | |
379 | } | |
380 | ||
381 | static void vfio_pci_release(void *device_data) | |
382 | { | |
383 | struct vfio_pci_device *vdev = device_data; | |
384 | ||
385 | mutex_lock(&driver_lock); | |
386 | ||
387 | if (!(--vdev->refcnt)) { | |
388 | vfio_spapr_pci_eeh_release(vdev->pdev); | |
389 | vfio_pci_disable(vdev); | |
390 | } | |
391 | ||
392 | mutex_unlock(&driver_lock); | |
393 | ||
394 | module_put(THIS_MODULE); | |
395 | } | |
396 | ||
397 | static int vfio_pci_open(void *device_data) | |
398 | { | |
399 | struct vfio_pci_device *vdev = device_data; | |
400 | int ret = 0; | |
401 | ||
402 | if (!try_module_get(THIS_MODULE)) | |
403 | return -ENODEV; | |
404 | ||
405 | mutex_lock(&driver_lock); | |
406 | ||
407 | if (!vdev->refcnt) { | |
408 | ret = vfio_pci_enable(vdev); | |
409 | if (ret) | |
410 | goto error; | |
411 | ||
412 | vfio_spapr_pci_eeh_open(vdev->pdev); | |
413 | } | |
414 | vdev->refcnt++; | |
415 | error: | |
416 | mutex_unlock(&driver_lock); | |
417 | if (ret) | |
418 | module_put(THIS_MODULE); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type) | |
423 | { | |
424 | if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) { | |
425 | u8 pin; | |
426 | pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin); | |
427 | if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && !vdev->nointx && pin) | |
428 | return 1; | |
429 | ||
430 | } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) { | |
431 | u8 pos; | |
432 | u16 flags; | |
433 | ||
434 | pos = vdev->pdev->msi_cap; | |
435 | if (pos) { | |
436 | pci_read_config_word(vdev->pdev, | |
437 | pos + PCI_MSI_FLAGS, &flags); | |
438 | return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1); | |
439 | } | |
440 | } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) { | |
441 | u8 pos; | |
442 | u16 flags; | |
443 | ||
444 | pos = vdev->pdev->msix_cap; | |
445 | if (pos) { | |
446 | pci_read_config_word(vdev->pdev, | |
447 | pos + PCI_MSIX_FLAGS, &flags); | |
448 | ||
449 | return (flags & PCI_MSIX_FLAGS_QSIZE) + 1; | |
450 | } | |
451 | } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) { | |
452 | if (pci_is_pcie(vdev->pdev)) | |
453 | return 1; | |
454 | } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) { | |
455 | return 1; | |
456 | } | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | static int vfio_pci_count_devs(struct pci_dev *pdev, void *data) | |
462 | { | |
463 | (*(int *)data)++; | |
464 | return 0; | |
465 | } | |
466 | ||
467 | struct vfio_pci_fill_info { | |
468 | int max; | |
469 | int cur; | |
470 | struct vfio_pci_dependent_device *devices; | |
471 | }; | |
472 | ||
473 | static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data) | |
474 | { | |
475 | struct vfio_pci_fill_info *fill = data; | |
476 | struct iommu_group *iommu_group; | |
477 | ||
478 | if (fill->cur == fill->max) | |
479 | return -EAGAIN; /* Something changed, try again */ | |
480 | ||
481 | iommu_group = iommu_group_get(&pdev->dev); | |
482 | if (!iommu_group) | |
483 | return -EPERM; /* Cannot reset non-isolated devices */ | |
484 | ||
485 | fill->devices[fill->cur].group_id = iommu_group_id(iommu_group); | |
486 | fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus); | |
487 | fill->devices[fill->cur].bus = pdev->bus->number; | |
488 | fill->devices[fill->cur].devfn = pdev->devfn; | |
489 | fill->cur++; | |
490 | iommu_group_put(iommu_group); | |
491 | return 0; | |
492 | } | |
493 | ||
494 | struct vfio_pci_group_entry { | |
495 | struct vfio_group *group; | |
496 | int id; | |
497 | }; | |
498 | ||
499 | struct vfio_pci_group_info { | |
500 | int count; | |
501 | struct vfio_pci_group_entry *groups; | |
502 | }; | |
503 | ||
504 | static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data) | |
505 | { | |
506 | struct vfio_pci_group_info *info = data; | |
507 | struct iommu_group *group; | |
508 | int id, i; | |
509 | ||
510 | group = iommu_group_get(&pdev->dev); | |
511 | if (!group) | |
512 | return -EPERM; | |
513 | ||
514 | id = iommu_group_id(group); | |
515 | ||
516 | for (i = 0; i < info->count; i++) | |
517 | if (info->groups[i].id == id) | |
518 | break; | |
519 | ||
520 | iommu_group_put(group); | |
521 | ||
522 | return (i == info->count) ? -EINVAL : 0; | |
523 | } | |
524 | ||
525 | static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot) | |
526 | { | |
527 | for (; pdev; pdev = pdev->bus->self) | |
528 | if (pdev->bus == slot->bus) | |
529 | return (pdev->slot == slot); | |
530 | return false; | |
531 | } | |
532 | ||
533 | struct vfio_pci_walk_info { | |
534 | int (*fn)(struct pci_dev *, void *data); | |
535 | void *data; | |
536 | struct pci_dev *pdev; | |
537 | bool slot; | |
538 | int ret; | |
539 | }; | |
540 | ||
541 | static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data) | |
542 | { | |
543 | struct vfio_pci_walk_info *walk = data; | |
544 | ||
545 | if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot)) | |
546 | walk->ret = walk->fn(pdev, walk->data); | |
547 | ||
548 | return walk->ret; | |
549 | } | |
550 | ||
551 | static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev, | |
552 | int (*fn)(struct pci_dev *, | |
553 | void *data), void *data, | |
554 | bool slot) | |
555 | { | |
556 | struct vfio_pci_walk_info walk = { | |
557 | .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0, | |
558 | }; | |
559 | ||
560 | pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk); | |
561 | ||
562 | return walk.ret; | |
563 | } | |
564 | ||
565 | static int msix_sparse_mmap_cap(struct vfio_pci_device *vdev, | |
566 | struct vfio_info_cap *caps) | |
567 | { | |
568 | struct vfio_region_info_cap_sparse_mmap *sparse; | |
569 | size_t end, size; | |
570 | int nr_areas = 2, i = 0, ret; | |
571 | ||
572 | end = pci_resource_len(vdev->pdev, vdev->msix_bar); | |
573 | ||
574 | /* If MSI-X table is aligned to the start or end, only one area */ | |
575 | if (((vdev->msix_offset & PAGE_MASK) == 0) || | |
576 | (PAGE_ALIGN(vdev->msix_offset + vdev->msix_size) >= end)) | |
577 | nr_areas = 1; | |
578 | ||
579 | size = sizeof(*sparse) + (nr_areas * sizeof(*sparse->areas)); | |
580 | ||
581 | sparse = kzalloc(size, GFP_KERNEL); | |
582 | if (!sparse) | |
583 | return -ENOMEM; | |
584 | ||
585 | sparse->nr_areas = nr_areas; | |
586 | ||
587 | if (vdev->msix_offset & PAGE_MASK) { | |
588 | sparse->areas[i].offset = 0; | |
589 | sparse->areas[i].size = vdev->msix_offset & PAGE_MASK; | |
590 | i++; | |
591 | } | |
592 | ||
593 | if (PAGE_ALIGN(vdev->msix_offset + vdev->msix_size) < end) { | |
594 | sparse->areas[i].offset = PAGE_ALIGN(vdev->msix_offset + | |
595 | vdev->msix_size); | |
596 | sparse->areas[i].size = end - sparse->areas[i].offset; | |
597 | i++; | |
598 | } | |
599 | ||
600 | ret = vfio_info_add_capability(caps, VFIO_REGION_INFO_CAP_SPARSE_MMAP, | |
601 | sparse); | |
602 | kfree(sparse); | |
603 | ||
604 | return ret; | |
605 | } | |
606 | ||
607 | int vfio_pci_register_dev_region(struct vfio_pci_device *vdev, | |
608 | unsigned int type, unsigned int subtype, | |
609 | const struct vfio_pci_regops *ops, | |
610 | size_t size, u32 flags, void *data) | |
611 | { | |
612 | struct vfio_pci_region *region; | |
613 | ||
614 | region = krealloc(vdev->region, | |
615 | (vdev->num_regions + 1) * sizeof(*region), | |
616 | GFP_KERNEL); | |
617 | if (!region) | |
618 | return -ENOMEM; | |
619 | ||
620 | vdev->region = region; | |
621 | vdev->region[vdev->num_regions].type = type; | |
622 | vdev->region[vdev->num_regions].subtype = subtype; | |
623 | vdev->region[vdev->num_regions].ops = ops; | |
624 | vdev->region[vdev->num_regions].size = size; | |
625 | vdev->region[vdev->num_regions].flags = flags; | |
626 | vdev->region[vdev->num_regions].data = data; | |
627 | ||
628 | vdev->num_regions++; | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | static long vfio_pci_ioctl(void *device_data, | |
634 | unsigned int cmd, unsigned long arg) | |
635 | { | |
636 | struct vfio_pci_device *vdev = device_data; | |
637 | unsigned long minsz; | |
638 | ||
639 | if (cmd == VFIO_DEVICE_GET_INFO) { | |
640 | struct vfio_device_info info; | |
641 | ||
642 | minsz = offsetofend(struct vfio_device_info, num_irqs); | |
643 | ||
644 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
645 | return -EFAULT; | |
646 | ||
647 | if (info.argsz < minsz) | |
648 | return -EINVAL; | |
649 | ||
650 | info.flags = VFIO_DEVICE_FLAGS_PCI; | |
651 | ||
652 | if (vdev->reset_works) | |
653 | info.flags |= VFIO_DEVICE_FLAGS_RESET; | |
654 | ||
655 | info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions; | |
656 | info.num_irqs = VFIO_PCI_NUM_IRQS; | |
657 | ||
658 | return copy_to_user((void __user *)arg, &info, minsz) ? | |
659 | -EFAULT : 0; | |
660 | ||
661 | } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { | |
662 | struct pci_dev *pdev = vdev->pdev; | |
663 | struct vfio_region_info info; | |
664 | struct vfio_info_cap caps = { .buf = NULL, .size = 0 }; | |
665 | int i, ret; | |
666 | ||
667 | minsz = offsetofend(struct vfio_region_info, offset); | |
668 | ||
669 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
670 | return -EFAULT; | |
671 | ||
672 | if (info.argsz < minsz) | |
673 | return -EINVAL; | |
674 | ||
675 | switch (info.index) { | |
676 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
677 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
678 | info.size = pdev->cfg_size; | |
679 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
680 | VFIO_REGION_INFO_FLAG_WRITE; | |
681 | break; | |
682 | case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: | |
683 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
684 | info.size = pci_resource_len(pdev, info.index); | |
685 | if (!info.size) { | |
686 | info.flags = 0; | |
687 | break; | |
688 | } | |
689 | ||
690 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
691 | VFIO_REGION_INFO_FLAG_WRITE; | |
692 | if (vdev->bar_mmap_supported[info.index]) { | |
693 | info.flags |= VFIO_REGION_INFO_FLAG_MMAP; | |
694 | if (info.index == vdev->msix_bar) { | |
695 | ret = msix_sparse_mmap_cap(vdev, &caps); | |
696 | if (ret) | |
697 | return ret; | |
698 | } | |
699 | } | |
700 | ||
701 | break; | |
702 | case VFIO_PCI_ROM_REGION_INDEX: | |
703 | { | |
704 | void __iomem *io; | |
705 | size_t size; | |
706 | ||
707 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
708 | info.flags = 0; | |
709 | ||
710 | /* Report the BAR size, not the ROM size */ | |
711 | info.size = pci_resource_len(pdev, info.index); | |
712 | if (!info.size) { | |
713 | /* Shadow ROMs appear as PCI option ROMs */ | |
714 | if (pdev->resource[PCI_ROM_RESOURCE].flags & | |
715 | IORESOURCE_ROM_SHADOW) | |
716 | info.size = 0x20000; | |
717 | else | |
718 | break; | |
719 | } | |
720 | ||
721 | /* Is it really there? */ | |
722 | io = pci_map_rom(pdev, &size); | |
723 | if (!io || !size) { | |
724 | info.size = 0; | |
725 | break; | |
726 | } | |
727 | pci_unmap_rom(pdev, io); | |
728 | ||
729 | info.flags = VFIO_REGION_INFO_FLAG_READ; | |
730 | break; | |
731 | } | |
732 | case VFIO_PCI_VGA_REGION_INDEX: | |
733 | if (!vdev->has_vga) | |
734 | return -EINVAL; | |
735 | ||
736 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
737 | info.size = 0xc0000; | |
738 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
739 | VFIO_REGION_INFO_FLAG_WRITE; | |
740 | ||
741 | break; | |
742 | default: | |
743 | { | |
744 | struct vfio_region_info_cap_type cap_type; | |
745 | ||
746 | if (info.index >= | |
747 | VFIO_PCI_NUM_REGIONS + vdev->num_regions) | |
748 | return -EINVAL; | |
749 | ||
750 | i = info.index - VFIO_PCI_NUM_REGIONS; | |
751 | ||
752 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
753 | info.size = vdev->region[i].size; | |
754 | info.flags = vdev->region[i].flags; | |
755 | ||
756 | cap_type.type = vdev->region[i].type; | |
757 | cap_type.subtype = vdev->region[i].subtype; | |
758 | ||
759 | ret = vfio_info_add_capability(&caps, | |
760 | VFIO_REGION_INFO_CAP_TYPE, | |
761 | &cap_type); | |
762 | if (ret) | |
763 | return ret; | |
764 | ||
765 | } | |
766 | } | |
767 | ||
768 | if (caps.size) { | |
769 | info.flags |= VFIO_REGION_INFO_FLAG_CAPS; | |
770 | if (info.argsz < sizeof(info) + caps.size) { | |
771 | info.argsz = sizeof(info) + caps.size; | |
772 | info.cap_offset = 0; | |
773 | } else { | |
774 | vfio_info_cap_shift(&caps, sizeof(info)); | |
775 | if (copy_to_user((void __user *)arg + | |
776 | sizeof(info), caps.buf, | |
777 | caps.size)) { | |
778 | kfree(caps.buf); | |
779 | return -EFAULT; | |
780 | } | |
781 | info.cap_offset = sizeof(info); | |
782 | } | |
783 | ||
784 | kfree(caps.buf); | |
785 | } | |
786 | ||
787 | return copy_to_user((void __user *)arg, &info, minsz) ? | |
788 | -EFAULT : 0; | |
789 | ||
790 | } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { | |
791 | struct vfio_irq_info info; | |
792 | ||
793 | minsz = offsetofend(struct vfio_irq_info, count); | |
794 | ||
795 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
796 | return -EFAULT; | |
797 | ||
798 | if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) | |
799 | return -EINVAL; | |
800 | ||
801 | switch (info.index) { | |
802 | case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: | |
803 | case VFIO_PCI_REQ_IRQ_INDEX: | |
804 | break; | |
805 | case VFIO_PCI_ERR_IRQ_INDEX: | |
806 | if (pci_is_pcie(vdev->pdev)) | |
807 | break; | |
808 | /* pass thru to return error */ | |
809 | default: | |
810 | return -EINVAL; | |
811 | } | |
812 | ||
813 | info.flags = VFIO_IRQ_INFO_EVENTFD; | |
814 | ||
815 | info.count = vfio_pci_get_irq_count(vdev, info.index); | |
816 | ||
817 | if (info.index == VFIO_PCI_INTX_IRQ_INDEX) | |
818 | info.flags |= (VFIO_IRQ_INFO_MASKABLE | | |
819 | VFIO_IRQ_INFO_AUTOMASKED); | |
820 | else | |
821 | info.flags |= VFIO_IRQ_INFO_NORESIZE; | |
822 | ||
823 | return copy_to_user((void __user *)arg, &info, minsz) ? | |
824 | -EFAULT : 0; | |
825 | ||
826 | } else if (cmd == VFIO_DEVICE_SET_IRQS) { | |
827 | struct vfio_irq_set hdr; | |
828 | u8 *data = NULL; | |
829 | int max, ret = 0; | |
830 | size_t data_size = 0; | |
831 | ||
832 | minsz = offsetofend(struct vfio_irq_set, count); | |
833 | ||
834 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
835 | return -EFAULT; | |
836 | ||
837 | max = vfio_pci_get_irq_count(vdev, hdr.index); | |
838 | ||
839 | ret = vfio_set_irqs_validate_and_prepare(&hdr, max, | |
840 | VFIO_PCI_NUM_IRQS, &data_size); | |
841 | if (ret) | |
842 | return ret; | |
843 | ||
844 | if (data_size) { | |
845 | data = memdup_user((void __user *)(arg + minsz), | |
846 | data_size); | |
847 | if (IS_ERR(data)) | |
848 | return PTR_ERR(data); | |
849 | } | |
850 | ||
851 | mutex_lock(&vdev->igate); | |
852 | ||
853 | ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index, | |
854 | hdr.start, hdr.count, data); | |
855 | ||
856 | mutex_unlock(&vdev->igate); | |
857 | kfree(data); | |
858 | ||
859 | return ret; | |
860 | ||
861 | } else if (cmd == VFIO_DEVICE_RESET) { | |
862 | return vdev->reset_works ? | |
863 | pci_try_reset_function(vdev->pdev) : -EINVAL; | |
864 | ||
865 | } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) { | |
866 | struct vfio_pci_hot_reset_info hdr; | |
867 | struct vfio_pci_fill_info fill = { 0 }; | |
868 | struct vfio_pci_dependent_device *devices = NULL; | |
869 | bool slot = false; | |
870 | int ret = 0; | |
871 | ||
872 | minsz = offsetofend(struct vfio_pci_hot_reset_info, count); | |
873 | ||
874 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
875 | return -EFAULT; | |
876 | ||
877 | if (hdr.argsz < minsz) | |
878 | return -EINVAL; | |
879 | ||
880 | hdr.flags = 0; | |
881 | ||
882 | /* Can we do a slot or bus reset or neither? */ | |
883 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
884 | slot = true; | |
885 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
886 | return -ENODEV; | |
887 | ||
888 | /* How many devices are affected? */ | |
889 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
890 | vfio_pci_count_devs, | |
891 | &fill.max, slot); | |
892 | if (ret) | |
893 | return ret; | |
894 | ||
895 | WARN_ON(!fill.max); /* Should always be at least one */ | |
896 | ||
897 | /* | |
898 | * If there's enough space, fill it now, otherwise return | |
899 | * -ENOSPC and the number of devices affected. | |
900 | */ | |
901 | if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) { | |
902 | ret = -ENOSPC; | |
903 | hdr.count = fill.max; | |
904 | goto reset_info_exit; | |
905 | } | |
906 | ||
907 | devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL); | |
908 | if (!devices) | |
909 | return -ENOMEM; | |
910 | ||
911 | fill.devices = devices; | |
912 | ||
913 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
914 | vfio_pci_fill_devs, | |
915 | &fill, slot); | |
916 | ||
917 | /* | |
918 | * If a device was removed between counting and filling, | |
919 | * we may come up short of fill.max. If a device was | |
920 | * added, we'll have a return of -EAGAIN above. | |
921 | */ | |
922 | if (!ret) | |
923 | hdr.count = fill.cur; | |
924 | ||
925 | reset_info_exit: | |
926 | if (copy_to_user((void __user *)arg, &hdr, minsz)) | |
927 | ret = -EFAULT; | |
928 | ||
929 | if (!ret) { | |
930 | if (copy_to_user((void __user *)(arg + minsz), devices, | |
931 | hdr.count * sizeof(*devices))) | |
932 | ret = -EFAULT; | |
933 | } | |
934 | ||
935 | kfree(devices); | |
936 | return ret; | |
937 | ||
938 | } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) { | |
939 | struct vfio_pci_hot_reset hdr; | |
940 | int32_t *group_fds; | |
941 | struct vfio_pci_group_entry *groups; | |
942 | struct vfio_pci_group_info info; | |
943 | bool slot = false; | |
944 | int i, count = 0, ret = 0; | |
945 | ||
946 | minsz = offsetofend(struct vfio_pci_hot_reset, count); | |
947 | ||
948 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
949 | return -EFAULT; | |
950 | ||
951 | if (hdr.argsz < minsz || hdr.flags) | |
952 | return -EINVAL; | |
953 | ||
954 | /* Can we do a slot or bus reset or neither? */ | |
955 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
956 | slot = true; | |
957 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
958 | return -ENODEV; | |
959 | ||
960 | /* | |
961 | * We can't let userspace give us an arbitrarily large | |
962 | * buffer to copy, so verify how many we think there | |
963 | * could be. Note groups can have multiple devices so | |
964 | * one group per device is the max. | |
965 | */ | |
966 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
967 | vfio_pci_count_devs, | |
968 | &count, slot); | |
969 | if (ret) | |
970 | return ret; | |
971 | ||
972 | /* Somewhere between 1 and count is OK */ | |
973 | if (!hdr.count || hdr.count > count) | |
974 | return -EINVAL; | |
975 | ||
976 | group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL); | |
977 | groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL); | |
978 | if (!group_fds || !groups) { | |
979 | kfree(group_fds); | |
980 | kfree(groups); | |
981 | return -ENOMEM; | |
982 | } | |
983 | ||
984 | if (copy_from_user(group_fds, (void __user *)(arg + minsz), | |
985 | hdr.count * sizeof(*group_fds))) { | |
986 | kfree(group_fds); | |
987 | kfree(groups); | |
988 | return -EFAULT; | |
989 | } | |
990 | ||
991 | /* | |
992 | * For each group_fd, get the group through the vfio external | |
993 | * user interface and store the group and iommu ID. This | |
994 | * ensures the group is held across the reset. | |
995 | */ | |
996 | for (i = 0; i < hdr.count; i++) { | |
997 | struct vfio_group *group; | |
998 | struct fd f = fdget(group_fds[i]); | |
999 | if (!f.file) { | |
1000 | ret = -EBADF; | |
1001 | break; | |
1002 | } | |
1003 | ||
1004 | group = vfio_group_get_external_user(f.file); | |
1005 | fdput(f); | |
1006 | if (IS_ERR(group)) { | |
1007 | ret = PTR_ERR(group); | |
1008 | break; | |
1009 | } | |
1010 | ||
1011 | groups[i].group = group; | |
1012 | groups[i].id = vfio_external_user_iommu_id(group); | |
1013 | } | |
1014 | ||
1015 | kfree(group_fds); | |
1016 | ||
1017 | /* release reference to groups on error */ | |
1018 | if (ret) | |
1019 | goto hot_reset_release; | |
1020 | ||
1021 | info.count = hdr.count; | |
1022 | info.groups = groups; | |
1023 | ||
1024 | /* | |
1025 | * Test whether all the affected devices are contained | |
1026 | * by the set of groups provided by the user. | |
1027 | */ | |
1028 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
1029 | vfio_pci_validate_devs, | |
1030 | &info, slot); | |
1031 | if (!ret) | |
1032 | /* User has access, do the reset */ | |
1033 | ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : | |
1034 | pci_try_reset_bus(vdev->pdev->bus); | |
1035 | ||
1036 | hot_reset_release: | |
1037 | for (i--; i >= 0; i--) | |
1038 | vfio_group_put_external_user(groups[i].group); | |
1039 | ||
1040 | kfree(groups); | |
1041 | return ret; | |
1042 | } | |
1043 | ||
1044 | return -ENOTTY; | |
1045 | } | |
1046 | ||
1047 | static ssize_t vfio_pci_rw(void *device_data, char __user *buf, | |
1048 | size_t count, loff_t *ppos, bool iswrite) | |
1049 | { | |
1050 | unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); | |
1051 | struct vfio_pci_device *vdev = device_data; | |
1052 | ||
1053 | if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions) | |
1054 | return -EINVAL; | |
1055 | ||
1056 | switch (index) { | |
1057 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
1058 | return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite); | |
1059 | ||
1060 | case VFIO_PCI_ROM_REGION_INDEX: | |
1061 | if (iswrite) | |
1062 | return -EINVAL; | |
1063 | return vfio_pci_bar_rw(vdev, buf, count, ppos, false); | |
1064 | ||
1065 | case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: | |
1066 | return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); | |
1067 | ||
1068 | case VFIO_PCI_VGA_REGION_INDEX: | |
1069 | return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); | |
1070 | default: | |
1071 | index -= VFIO_PCI_NUM_REGIONS; | |
1072 | return vdev->region[index].ops->rw(vdev, buf, | |
1073 | count, ppos, iswrite); | |
1074 | } | |
1075 | ||
1076 | return -EINVAL; | |
1077 | } | |
1078 | ||
1079 | static ssize_t vfio_pci_read(void *device_data, char __user *buf, | |
1080 | size_t count, loff_t *ppos) | |
1081 | { | |
1082 | if (!count) | |
1083 | return 0; | |
1084 | ||
1085 | return vfio_pci_rw(device_data, buf, count, ppos, false); | |
1086 | } | |
1087 | ||
1088 | static ssize_t vfio_pci_write(void *device_data, const char __user *buf, | |
1089 | size_t count, loff_t *ppos) | |
1090 | { | |
1091 | if (!count) | |
1092 | return 0; | |
1093 | ||
1094 | return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true); | |
1095 | } | |
1096 | ||
1097 | static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) | |
1098 | { | |
1099 | struct vfio_pci_device *vdev = device_data; | |
1100 | struct pci_dev *pdev = vdev->pdev; | |
1101 | unsigned int index; | |
1102 | u64 phys_len, req_len, pgoff, req_start; | |
1103 | int ret; | |
1104 | ||
1105 | index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); | |
1106 | ||
1107 | if (vma->vm_end < vma->vm_start) | |
1108 | return -EINVAL; | |
1109 | if ((vma->vm_flags & VM_SHARED) == 0) | |
1110 | return -EINVAL; | |
1111 | if (index >= VFIO_PCI_ROM_REGION_INDEX) | |
1112 | return -EINVAL; | |
1113 | if (!vdev->bar_mmap_supported[index]) | |
1114 | return -EINVAL; | |
1115 | ||
1116 | phys_len = PAGE_ALIGN(pci_resource_len(pdev, index)); | |
1117 | req_len = vma->vm_end - vma->vm_start; | |
1118 | pgoff = vma->vm_pgoff & | |
1119 | ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); | |
1120 | req_start = pgoff << PAGE_SHIFT; | |
1121 | ||
1122 | if (req_start + req_len > phys_len) | |
1123 | return -EINVAL; | |
1124 | ||
1125 | if (index == vdev->msix_bar) { | |
1126 | /* | |
1127 | * Disallow mmaps overlapping the MSI-X table; users don't | |
1128 | * get to touch this directly. We could find somewhere | |
1129 | * else to map the overlap, but page granularity is only | |
1130 | * a recommendation, not a requirement, so the user needs | |
1131 | * to know which bits are real. Requiring them to mmap | |
1132 | * around the table makes that clear. | |
1133 | */ | |
1134 | ||
1135 | /* If neither entirely above nor below, then it overlaps */ | |
1136 | if (!(req_start >= vdev->msix_offset + vdev->msix_size || | |
1137 | req_start + req_len <= vdev->msix_offset)) | |
1138 | return -EINVAL; | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Even though we don't make use of the barmap for the mmap, | |
1143 | * we need to request the region and the barmap tracks that. | |
1144 | */ | |
1145 | if (!vdev->barmap[index]) { | |
1146 | ret = pci_request_selected_regions(pdev, | |
1147 | 1 << index, "vfio-pci"); | |
1148 | if (ret) | |
1149 | return ret; | |
1150 | ||
1151 | vdev->barmap[index] = pci_iomap(pdev, index, 0); | |
1152 | if (!vdev->barmap[index]) { | |
1153 | pci_release_selected_regions(pdev, 1 << index); | |
1154 | return -ENOMEM; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | vma->vm_private_data = vdev; | |
1159 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1160 | vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff; | |
1161 | ||
1162 | return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, | |
1163 | req_len, vma->vm_page_prot); | |
1164 | } | |
1165 | ||
1166 | static void vfio_pci_request(void *device_data, unsigned int count) | |
1167 | { | |
1168 | struct vfio_pci_device *vdev = device_data; | |
1169 | ||
1170 | mutex_lock(&vdev->igate); | |
1171 | ||
1172 | if (vdev->req_trigger) { | |
1173 | if (!(count % 10)) | |
1174 | dev_notice_ratelimited(&vdev->pdev->dev, | |
1175 | "Relaying device request to user (#%u)\n", | |
1176 | count); | |
1177 | eventfd_signal(vdev->req_trigger, 1); | |
1178 | } else if (count == 0) { | |
1179 | dev_warn(&vdev->pdev->dev, | |
1180 | "No device request channel registered, blocked until released by user\n"); | |
1181 | } | |
1182 | ||
1183 | mutex_unlock(&vdev->igate); | |
1184 | } | |
1185 | ||
1186 | static const struct vfio_device_ops vfio_pci_ops = { | |
1187 | .name = "vfio-pci", | |
1188 | .open = vfio_pci_open, | |
1189 | .release = vfio_pci_release, | |
1190 | .ioctl = vfio_pci_ioctl, | |
1191 | .read = vfio_pci_read, | |
1192 | .write = vfio_pci_write, | |
1193 | .mmap = vfio_pci_mmap, | |
1194 | .request = vfio_pci_request, | |
1195 | }; | |
1196 | ||
1197 | static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) | |
1198 | { | |
1199 | struct vfio_pci_device *vdev; | |
1200 | struct iommu_group *group; | |
1201 | int ret; | |
1202 | ||
1203 | if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL) | |
1204 | return -EINVAL; | |
1205 | ||
1206 | group = vfio_iommu_group_get(&pdev->dev); | |
1207 | if (!group) | |
1208 | return -EINVAL; | |
1209 | ||
1210 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); | |
1211 | if (!vdev) { | |
1212 | vfio_iommu_group_put(group, &pdev->dev); | |
1213 | return -ENOMEM; | |
1214 | } | |
1215 | ||
1216 | vdev->pdev = pdev; | |
1217 | vdev->irq_type = VFIO_PCI_NUM_IRQS; | |
1218 | mutex_init(&vdev->igate); | |
1219 | spin_lock_init(&vdev->irqlock); | |
1220 | ||
1221 | ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); | |
1222 | if (ret) { | |
1223 | vfio_iommu_group_put(group, &pdev->dev); | |
1224 | kfree(vdev); | |
1225 | return ret; | |
1226 | } | |
1227 | ||
1228 | if (vfio_pci_is_vga(pdev)) { | |
1229 | vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode); | |
1230 | vga_set_legacy_decoding(pdev, | |
1231 | vfio_pci_set_vga_decode(vdev, false)); | |
1232 | } | |
1233 | ||
1234 | if (!disable_idle_d3) { | |
1235 | /* | |
1236 | * pci-core sets the device power state to an unknown value at | |
1237 | * bootup and after being removed from a driver. The only | |
1238 | * transition it allows from this unknown state is to D0, which | |
1239 | * typically happens when a driver calls pci_enable_device(). | |
1240 | * We're not ready to enable the device yet, but we do want to | |
1241 | * be able to get to D3. Therefore first do a D0 transition | |
1242 | * before going to D3. | |
1243 | */ | |
1244 | pci_set_power_state(pdev, PCI_D0); | |
1245 | pci_set_power_state(pdev, PCI_D3hot); | |
1246 | } | |
1247 | ||
1248 | return ret; | |
1249 | } | |
1250 | ||
1251 | static void vfio_pci_remove(struct pci_dev *pdev) | |
1252 | { | |
1253 | struct vfio_pci_device *vdev; | |
1254 | ||
1255 | vdev = vfio_del_group_dev(&pdev->dev); | |
1256 | if (!vdev) | |
1257 | return; | |
1258 | ||
1259 | vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev); | |
1260 | kfree(vdev->region); | |
1261 | kfree(vdev); | |
1262 | ||
1263 | if (vfio_pci_is_vga(pdev)) { | |
1264 | vga_client_register(pdev, NULL, NULL, NULL); | |
1265 | vga_set_legacy_decoding(pdev, | |
1266 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | | |
1267 | VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); | |
1268 | } | |
1269 | ||
1270 | if (!disable_idle_d3) | |
1271 | pci_set_power_state(pdev, PCI_D0); | |
1272 | } | |
1273 | ||
1274 | static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, | |
1275 | pci_channel_state_t state) | |
1276 | { | |
1277 | struct vfio_pci_device *vdev; | |
1278 | struct vfio_device *device; | |
1279 | ||
1280 | device = vfio_device_get_from_dev(&pdev->dev); | |
1281 | if (device == NULL) | |
1282 | return PCI_ERS_RESULT_DISCONNECT; | |
1283 | ||
1284 | vdev = vfio_device_data(device); | |
1285 | if (vdev == NULL) { | |
1286 | vfio_device_put(device); | |
1287 | return PCI_ERS_RESULT_DISCONNECT; | |
1288 | } | |
1289 | ||
1290 | mutex_lock(&vdev->igate); | |
1291 | ||
1292 | if (vdev->err_trigger) | |
1293 | eventfd_signal(vdev->err_trigger, 1); | |
1294 | ||
1295 | mutex_unlock(&vdev->igate); | |
1296 | ||
1297 | vfio_device_put(device); | |
1298 | ||
1299 | return PCI_ERS_RESULT_CAN_RECOVER; | |
1300 | } | |
1301 | ||
1302 | static const struct pci_error_handlers vfio_err_handlers = { | |
1303 | .error_detected = vfio_pci_aer_err_detected, | |
1304 | }; | |
1305 | ||
1306 | static struct pci_driver vfio_pci_driver = { | |
1307 | .name = "vfio-pci", | |
1308 | .id_table = NULL, /* only dynamic ids */ | |
1309 | .probe = vfio_pci_probe, | |
1310 | .remove = vfio_pci_remove, | |
1311 | .err_handler = &vfio_err_handlers, | |
1312 | }; | |
1313 | ||
1314 | struct vfio_devices { | |
1315 | struct vfio_device **devices; | |
1316 | int cur_index; | |
1317 | int max_index; | |
1318 | }; | |
1319 | ||
1320 | static int vfio_pci_get_devs(struct pci_dev *pdev, void *data) | |
1321 | { | |
1322 | struct vfio_devices *devs = data; | |
1323 | struct vfio_device *device; | |
1324 | ||
1325 | if (devs->cur_index == devs->max_index) | |
1326 | return -ENOSPC; | |
1327 | ||
1328 | device = vfio_device_get_from_dev(&pdev->dev); | |
1329 | if (!device) | |
1330 | return -EINVAL; | |
1331 | ||
1332 | if (pci_dev_driver(pdev) != &vfio_pci_driver) { | |
1333 | vfio_device_put(device); | |
1334 | return -EBUSY; | |
1335 | } | |
1336 | ||
1337 | devs->devices[devs->cur_index++] = device; | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * Attempt to do a bus/slot reset if there are devices affected by a reset for | |
1343 | * this device that are needs_reset and all of the affected devices are unused | |
1344 | * (!refcnt). Callers are required to hold driver_lock when calling this to | |
1345 | * prevent device opens and concurrent bus reset attempts. We prevent device | |
1346 | * unbinds by acquiring and holding a reference to the vfio_device. | |
1347 | * | |
1348 | * NB: vfio-core considers a group to be viable even if some devices are | |
1349 | * bound to drivers like pci-stub or pcieport. Here we require all devices | |
1350 | * to be bound to vfio_pci since that's the only way we can be sure they | |
1351 | * stay put. | |
1352 | */ | |
1353 | static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) | |
1354 | { | |
1355 | struct vfio_devices devs = { .cur_index = 0 }; | |
1356 | int i = 0, ret = -EINVAL; | |
1357 | bool needs_reset = false, slot = false; | |
1358 | struct vfio_pci_device *tmp; | |
1359 | ||
1360 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
1361 | slot = true; | |
1362 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
1363 | return; | |
1364 | ||
1365 | if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs, | |
1366 | &i, slot) || !i) | |
1367 | return; | |
1368 | ||
1369 | devs.max_index = i; | |
1370 | devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL); | |
1371 | if (!devs.devices) | |
1372 | return; | |
1373 | ||
1374 | if (vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
1375 | vfio_pci_get_devs, &devs, slot)) | |
1376 | goto put_devs; | |
1377 | ||
1378 | for (i = 0; i < devs.cur_index; i++) { | |
1379 | tmp = vfio_device_data(devs.devices[i]); | |
1380 | if (tmp->needs_reset) | |
1381 | needs_reset = true; | |
1382 | if (tmp->refcnt) | |
1383 | goto put_devs; | |
1384 | } | |
1385 | ||
1386 | if (needs_reset) | |
1387 | ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : | |
1388 | pci_try_reset_bus(vdev->pdev->bus); | |
1389 | ||
1390 | put_devs: | |
1391 | for (i = 0; i < devs.cur_index; i++) { | |
1392 | tmp = vfio_device_data(devs.devices[i]); | |
1393 | if (!ret) | |
1394 | tmp->needs_reset = false; | |
1395 | ||
1396 | if (!tmp->refcnt && !disable_idle_d3) | |
1397 | pci_set_power_state(tmp->pdev, PCI_D3hot); | |
1398 | ||
1399 | vfio_device_put(devs.devices[i]); | |
1400 | } | |
1401 | ||
1402 | kfree(devs.devices); | |
1403 | } | |
1404 | ||
1405 | static void __exit vfio_pci_cleanup(void) | |
1406 | { | |
1407 | pci_unregister_driver(&vfio_pci_driver); | |
1408 | vfio_pci_uninit_perm_bits(); | |
1409 | } | |
1410 | ||
1411 | static void __init vfio_pci_fill_ids(void) | |
1412 | { | |
1413 | char *p, *id; | |
1414 | int rc; | |
1415 | ||
1416 | /* no ids passed actually */ | |
1417 | if (ids[0] == '\0') | |
1418 | return; | |
1419 | ||
1420 | /* add ids specified in the module parameter */ | |
1421 | p = ids; | |
1422 | while ((id = strsep(&p, ","))) { | |
1423 | unsigned int vendor, device, subvendor = PCI_ANY_ID, | |
1424 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
1425 | int fields; | |
1426 | ||
1427 | if (!strlen(id)) | |
1428 | continue; | |
1429 | ||
1430 | fields = sscanf(id, "%x:%x:%x:%x:%x:%x", | |
1431 | &vendor, &device, &subvendor, &subdevice, | |
1432 | &class, &class_mask); | |
1433 | ||
1434 | if (fields < 2) { | |
1435 | pr_warn("invalid id string \"%s\"\n", id); | |
1436 | continue; | |
1437 | } | |
1438 | ||
1439 | rc = pci_add_dynid(&vfio_pci_driver, vendor, device, | |
1440 | subvendor, subdevice, class, class_mask, 0); | |
1441 | if (rc) | |
1442 | pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", | |
1443 | vendor, device, subvendor, subdevice, | |
1444 | class, class_mask, rc); | |
1445 | else | |
1446 | pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", | |
1447 | vendor, device, subvendor, subdevice, | |
1448 | class, class_mask); | |
1449 | } | |
1450 | } | |
1451 | ||
1452 | static int __init vfio_pci_init(void) | |
1453 | { | |
1454 | int ret; | |
1455 | ||
1456 | /* Allocate shared config space permision data used by all devices */ | |
1457 | ret = vfio_pci_init_perm_bits(); | |
1458 | if (ret) | |
1459 | return ret; | |
1460 | ||
1461 | /* Register and scan for devices */ | |
1462 | ret = pci_register_driver(&vfio_pci_driver); | |
1463 | if (ret) | |
1464 | goto out_driver; | |
1465 | ||
1466 | vfio_pci_fill_ids(); | |
1467 | ||
1468 | return 0; | |
1469 | ||
1470 | out_driver: | |
1471 | vfio_pci_uninit_perm_bits(); | |
1472 | return ret; | |
1473 | } | |
1474 | ||
1475 | module_init(vfio_pci_init); | |
1476 | module_exit(vfio_pci_cleanup); | |
1477 | ||
1478 | MODULE_VERSION(DRIVER_VERSION); | |
1479 | MODULE_LICENSE("GPL v2"); | |
1480 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1481 | MODULE_DESCRIPTION(DRIVER_DESC); |