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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 | ||
05f0c03f YX |
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 | ||
bc4fba77 | 181 | static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev); |
f572a960 | 182 | static void vfio_pci_disable(struct vfio_pci_device *vdev); |
bc4fba77 | 183 | |
45074405 AW |
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) { | |
7d57e5e9 | 198 | /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */ |
45074405 AW |
199 | case 0x1572: |
200 | case 0x1574: | |
201 | case 0x1580 ... 0x1581: | |
7d57e5e9 | 202 | case 0x1583 ... 0x158b: |
45074405 AW |
203 | case 0x37d0 ... 0x37d2: |
204 | return true; | |
205 | default: | |
206 | return false; | |
207 | } | |
208 | } | |
209 | ||
210 | return false; | |
211 | } | |
212 | ||
89e1f7d4 AW |
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 | ||
6eb70187 AW |
220 | pci_set_power_state(pdev, PCI_D0); |
221 | ||
9c22e660 AW |
222 | /* Don't allow our initial saved state to include busmaster */ |
223 | pci_clear_master(pdev); | |
224 | ||
9a92c509 AW |
225 | ret = pci_enable_device(pdev); |
226 | if (ret) | |
227 | return ret; | |
228 | ||
9f478035 AW |
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; | |
89e1f7d4 AW |
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 | ||
45074405 AW |
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); | |
9a92c509 | 250 | } |
89e1f7d4 | 251 | |
89e1f7d4 AW |
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 | ||
45074405 AW |
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 | ||
a9047f24 | 266 | msix_pos = pdev->msix_cap; |
89e1f7d4 AW |
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 | ||
508d1aa6 BH |
274 | vdev->msix_bar = table & PCI_MSIX_TABLE_BIR; |
275 | vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET; | |
89e1f7d4 AW |
276 | vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16; |
277 | } else | |
278 | vdev->msix_bar = 0xFF; | |
279 | ||
ecaa1f6a | 280 | if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev)) |
84237a82 | 281 | vdev->has_vga = true; |
84237a82 | 282 | |
5846ff54 | 283 | |
f572a960 AW |
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 | } | |
5846ff54 AW |
294 | } |
295 | ||
05f0c03f YX |
296 | vfio_pci_probe_mmaps(vdev); |
297 | ||
9a92c509 | 298 | return 0; |
89e1f7d4 AW |
299 | } |
300 | ||
301 | static void vfio_pci_disable(struct vfio_pci_device *vdev) | |
302 | { | |
2007722a | 303 | struct pci_dev *pdev = vdev->pdev; |
05f0c03f | 304 | struct vfio_pci_dummy_resource *dummy_res, *tmp; |
28541d41 | 305 | int i, bar; |
89e1f7d4 | 306 | |
9c22e660 AW |
307 | /* Stop the device from further DMA */ |
308 | pci_clear_master(pdev); | |
89e1f7d4 AW |
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 | ||
28541d41 AW |
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 | ||
89e1f7d4 AW |
323 | vfio_config_free(vdev); |
324 | ||
89e1f7d4 AW |
325 | for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { |
326 | if (!vdev->barmap[bar]) | |
327 | continue; | |
2007722a AW |
328 | pci_iounmap(pdev, vdev->barmap[bar]); |
329 | pci_release_selected_regions(pdev, 1 << bar); | |
89e1f7d4 AW |
330 | vdev->barmap[bar] = NULL; |
331 | } | |
2007722a | 332 | |
05f0c03f YX |
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 | ||
bc4fba77 AW |
340 | vdev->needs_reset = true; |
341 | ||
2007722a AW |
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) | |
9c22e660 | 353 | goto out; |
2007722a AW |
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 | ||
d24cdbfd | 364 | /* |
890ed578 AW |
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. | |
d24cdbfd | 367 | */ |
561d72dd AW |
368 | if (vdev->reset_works && !pci_try_reset_function(pdev)) |
369 | vdev->needs_reset = false; | |
2007722a AW |
370 | |
371 | pci_restore_state(pdev); | |
9c22e660 AW |
372 | out: |
373 | pci_disable_device(pdev); | |
bc4fba77 AW |
374 | |
375 | vfio_pci_try_bus_reset(vdev); | |
6eb70187 AW |
376 | |
377 | if (!disable_idle_d3) | |
378 | pci_set_power_state(pdev, PCI_D3hot); | |
89e1f7d4 AW |
379 | } |
380 | ||
381 | static void vfio_pci_release(void *device_data) | |
382 | { | |
383 | struct vfio_pci_device *vdev = device_data; | |
384 | ||
61d79256 AW |
385 | mutex_lock(&driver_lock); |
386 | ||
387 | if (!(--vdev->refcnt)) { | |
1b69be5e | 388 | vfio_spapr_pci_eeh_release(vdev->pdev); |
89e1f7d4 | 389 | vfio_pci_disable(vdev); |
1b69be5e | 390 | } |
89e1f7d4 | 391 | |
61d79256 AW |
392 | mutex_unlock(&driver_lock); |
393 | ||
89e1f7d4 AW |
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; | |
61d79256 | 400 | int ret = 0; |
89e1f7d4 AW |
401 | |
402 | if (!try_module_get(THIS_MODULE)) | |
403 | return -ENODEV; | |
404 | ||
61d79256 AW |
405 | mutex_lock(&driver_lock); |
406 | ||
407 | if (!vdev->refcnt) { | |
1b69be5e GS |
408 | ret = vfio_pci_enable(vdev); |
409 | if (ret) | |
410 | goto error; | |
411 | ||
9b936c96 | 412 | vfio_spapr_pci_eeh_open(vdev->pdev); |
89e1f7d4 | 413 | } |
61d79256 | 414 | vdev->refcnt++; |
1b69be5e | 415 | error: |
61d79256 AW |
416 | mutex_unlock(&driver_lock); |
417 | if (ret) | |
418 | module_put(THIS_MODULE); | |
1b69be5e | 419 | return ret; |
89e1f7d4 AW |
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); | |
45074405 | 427 | if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && !vdev->nointx && pin) |
89e1f7d4 AW |
428 | return 1; |
429 | ||
430 | } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) { | |
431 | u8 pos; | |
432 | u16 flags; | |
433 | ||
a9047f24 | 434 | pos = vdev->pdev->msi_cap; |
89e1f7d4 AW |
435 | if (pos) { |
436 | pci_read_config_word(vdev->pdev, | |
437 | pos + PCI_MSI_FLAGS, &flags); | |
fd49c81f | 438 | return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1); |
89e1f7d4 AW |
439 | } |
440 | } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) { | |
441 | u8 pos; | |
442 | u16 flags; | |
443 | ||
a9047f24 | 444 | pos = vdev->pdev->msix_cap; |
89e1f7d4 AW |
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 | } | |
6140a8f5 | 451 | } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) { |
dad9f897 VMP |
452 | if (pci_is_pcie(vdev->pdev)) |
453 | return 1; | |
6140a8f5 AW |
454 | } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) { |
455 | return 1; | |
456 | } | |
89e1f7d4 AW |
457 | |
458 | return 0; | |
459 | } | |
460 | ||
8b27ee60 AW |
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 | ||
a32295c6 AK |
565 | static int msix_mmappable_cap(struct vfio_pci_device *vdev, |
566 | struct vfio_info_cap *caps) | |
188ad9d6 | 567 | { |
a32295c6 AK |
568 | struct vfio_info_cap_header header = { |
569 | .id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE, | |
570 | .version = 1 | |
571 | }; | |
28541d41 | 572 | |
a32295c6 | 573 | return vfio_info_add_capability(caps, &header, sizeof(header)); |
28541d41 AW |
574 | } |
575 | ||
576 | int vfio_pci_register_dev_region(struct vfio_pci_device *vdev, | |
577 | unsigned int type, unsigned int subtype, | |
578 | const struct vfio_pci_regops *ops, | |
579 | size_t size, u32 flags, void *data) | |
580 | { | |
581 | struct vfio_pci_region *region; | |
582 | ||
583 | region = krealloc(vdev->region, | |
584 | (vdev->num_regions + 1) * sizeof(*region), | |
585 | GFP_KERNEL); | |
586 | if (!region) | |
587 | return -ENOMEM; | |
588 | ||
589 | vdev->region = region; | |
590 | vdev->region[vdev->num_regions].type = type; | |
591 | vdev->region[vdev->num_regions].subtype = subtype; | |
592 | vdev->region[vdev->num_regions].ops = ops; | |
593 | vdev->region[vdev->num_regions].size = size; | |
594 | vdev->region[vdev->num_regions].flags = flags; | |
595 | vdev->region[vdev->num_regions].data = data; | |
596 | ||
597 | vdev->num_regions++; | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
89e1f7d4 AW |
602 | static long vfio_pci_ioctl(void *device_data, |
603 | unsigned int cmd, unsigned long arg) | |
604 | { | |
605 | struct vfio_pci_device *vdev = device_data; | |
606 | unsigned long minsz; | |
607 | ||
608 | if (cmd == VFIO_DEVICE_GET_INFO) { | |
609 | struct vfio_device_info info; | |
610 | ||
611 | minsz = offsetofend(struct vfio_device_info, num_irqs); | |
612 | ||
613 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
614 | return -EFAULT; | |
615 | ||
616 | if (info.argsz < minsz) | |
617 | return -EINVAL; | |
618 | ||
619 | info.flags = VFIO_DEVICE_FLAGS_PCI; | |
620 | ||
621 | if (vdev->reset_works) | |
622 | info.flags |= VFIO_DEVICE_FLAGS_RESET; | |
623 | ||
28541d41 | 624 | info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions; |
89e1f7d4 AW |
625 | info.num_irqs = VFIO_PCI_NUM_IRQS; |
626 | ||
8160c4e4 MT |
627 | return copy_to_user((void __user *)arg, &info, minsz) ? |
628 | -EFAULT : 0; | |
89e1f7d4 AW |
629 | |
630 | } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { | |
631 | struct pci_dev *pdev = vdev->pdev; | |
632 | struct vfio_region_info info; | |
188ad9d6 | 633 | struct vfio_info_cap caps = { .buf = NULL, .size = 0 }; |
28541d41 | 634 | int i, ret; |
89e1f7d4 AW |
635 | |
636 | minsz = offsetofend(struct vfio_region_info, offset); | |
637 | ||
638 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
639 | return -EFAULT; | |
640 | ||
641 | if (info.argsz < minsz) | |
642 | return -EINVAL; | |
643 | ||
644 | switch (info.index) { | |
645 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
646 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
647 | info.size = pdev->cfg_size; | |
648 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
649 | VFIO_REGION_INFO_FLAG_WRITE; | |
650 | break; | |
651 | case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: | |
652 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
653 | info.size = pci_resource_len(pdev, info.index); | |
654 | if (!info.size) { | |
655 | info.flags = 0; | |
656 | break; | |
657 | } | |
658 | ||
659 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
660 | VFIO_REGION_INFO_FLAG_WRITE; | |
05f0c03f | 661 | if (vdev->bar_mmap_supported[info.index]) { |
89e1f7d4 | 662 | info.flags |= VFIO_REGION_INFO_FLAG_MMAP; |
188ad9d6 | 663 | if (info.index == vdev->msix_bar) { |
a32295c6 | 664 | ret = msix_mmappable_cap(vdev, &caps); |
188ad9d6 AW |
665 | if (ret) |
666 | return ret; | |
667 | } | |
668 | } | |
669 | ||
89e1f7d4 AW |
670 | break; |
671 | case VFIO_PCI_ROM_REGION_INDEX: | |
672 | { | |
673 | void __iomem *io; | |
674 | size_t size; | |
675 | ||
676 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
677 | info.flags = 0; | |
678 | ||
679 | /* Report the BAR size, not the ROM size */ | |
680 | info.size = pci_resource_len(pdev, info.index); | |
a13b6459 AW |
681 | if (!info.size) { |
682 | /* Shadow ROMs appear as PCI option ROMs */ | |
683 | if (pdev->resource[PCI_ROM_RESOURCE].flags & | |
684 | IORESOURCE_ROM_SHADOW) | |
685 | info.size = 0x20000; | |
686 | else | |
687 | break; | |
688 | } | |
89e1f7d4 AW |
689 | |
690 | /* Is it really there? */ | |
691 | io = pci_map_rom(pdev, &size); | |
692 | if (!io || !size) { | |
693 | info.size = 0; | |
694 | break; | |
695 | } | |
696 | pci_unmap_rom(pdev, io); | |
697 | ||
698 | info.flags = VFIO_REGION_INFO_FLAG_READ; | |
699 | break; | |
700 | } | |
84237a82 AW |
701 | case VFIO_PCI_VGA_REGION_INDEX: |
702 | if (!vdev->has_vga) | |
703 | return -EINVAL; | |
704 | ||
705 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
706 | info.size = 0xc0000; | |
707 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
708 | VFIO_REGION_INFO_FLAG_WRITE; | |
709 | ||
710 | break; | |
89e1f7d4 | 711 | default: |
c535d345 | 712 | { |
dda01f78 AW |
713 | struct vfio_region_info_cap_type cap_type = { |
714 | .header.id = VFIO_REGION_INFO_CAP_TYPE, | |
715 | .header.version = 1 }; | |
c535d345 | 716 | |
28541d41 AW |
717 | if (info.index >= |
718 | VFIO_PCI_NUM_REGIONS + vdev->num_regions) | |
719 | return -EINVAL; | |
720 | ||
721 | i = info.index - VFIO_PCI_NUM_REGIONS; | |
722 | ||
723 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
724 | info.size = vdev->region[i].size; | |
725 | info.flags = vdev->region[i].flags; | |
726 | ||
c535d345 KW |
727 | cap_type.type = vdev->region[i].type; |
728 | cap_type.subtype = vdev->region[i].subtype; | |
729 | ||
dda01f78 AW |
730 | ret = vfio_info_add_capability(&caps, &cap_type.header, |
731 | sizeof(cap_type)); | |
28541d41 AW |
732 | if (ret) |
733 | return ret; | |
c535d345 KW |
734 | |
735 | } | |
89e1f7d4 AW |
736 | } |
737 | ||
188ad9d6 AW |
738 | if (caps.size) { |
739 | info.flags |= VFIO_REGION_INFO_FLAG_CAPS; | |
740 | if (info.argsz < sizeof(info) + caps.size) { | |
741 | info.argsz = sizeof(info) + caps.size; | |
742 | info.cap_offset = 0; | |
743 | } else { | |
744 | vfio_info_cap_shift(&caps, sizeof(info)); | |
c4aec310 DC |
745 | if (copy_to_user((void __user *)arg + |
746 | sizeof(info), caps.buf, | |
747 | caps.size)) { | |
188ad9d6 | 748 | kfree(caps.buf); |
c4aec310 | 749 | return -EFAULT; |
188ad9d6 AW |
750 | } |
751 | info.cap_offset = sizeof(info); | |
752 | } | |
753 | ||
754 | kfree(caps.buf); | |
89e1f7d4 AW |
755 | } |
756 | ||
8160c4e4 MT |
757 | return copy_to_user((void __user *)arg, &info, minsz) ? |
758 | -EFAULT : 0; | |
89e1f7d4 AW |
759 | |
760 | } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { | |
761 | struct vfio_irq_info info; | |
762 | ||
763 | minsz = offsetofend(struct vfio_irq_info, count); | |
764 | ||
765 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
766 | return -EFAULT; | |
767 | ||
768 | if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) | |
769 | return -EINVAL; | |
770 | ||
dad9f897 VMP |
771 | switch (info.index) { |
772 | case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: | |
6140a8f5 | 773 | case VFIO_PCI_REQ_IRQ_INDEX: |
dad9f897 VMP |
774 | break; |
775 | case VFIO_PCI_ERR_IRQ_INDEX: | |
776 | if (pci_is_pcie(vdev->pdev)) | |
777 | break; | |
778 | /* pass thru to return error */ | |
779 | default: | |
780 | return -EINVAL; | |
781 | } | |
782 | ||
89e1f7d4 AW |
783 | info.flags = VFIO_IRQ_INFO_EVENTFD; |
784 | ||
785 | info.count = vfio_pci_get_irq_count(vdev, info.index); | |
786 | ||
787 | if (info.index == VFIO_PCI_INTX_IRQ_INDEX) | |
788 | info.flags |= (VFIO_IRQ_INFO_MASKABLE | | |
789 | VFIO_IRQ_INFO_AUTOMASKED); | |
790 | else | |
791 | info.flags |= VFIO_IRQ_INFO_NORESIZE; | |
792 | ||
8160c4e4 MT |
793 | return copy_to_user((void __user *)arg, &info, minsz) ? |
794 | -EFAULT : 0; | |
89e1f7d4 AW |
795 | |
796 | } else if (cmd == VFIO_DEVICE_SET_IRQS) { | |
797 | struct vfio_irq_set hdr; | |
798 | u8 *data = NULL; | |
05692d70 | 799 | int max, ret = 0; |
ef198aaa | 800 | size_t data_size = 0; |
89e1f7d4 AW |
801 | |
802 | minsz = offsetofend(struct vfio_irq_set, count); | |
803 | ||
804 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
805 | return -EFAULT; | |
806 | ||
05692d70 | 807 | max = vfio_pci_get_irq_count(vdev, hdr.index); |
89e1f7d4 | 808 | |
ef198aaa KW |
809 | ret = vfio_set_irqs_validate_and_prepare(&hdr, max, |
810 | VFIO_PCI_NUM_IRQS, &data_size); | |
811 | if (ret) | |
812 | return ret; | |
89e1f7d4 | 813 | |
ef198aaa | 814 | if (data_size) { |
3a1f7041 | 815 | data = memdup_user((void __user *)(arg + minsz), |
ef198aaa | 816 | data_size); |
3a1f7041 FW |
817 | if (IS_ERR(data)) |
818 | return PTR_ERR(data); | |
89e1f7d4 AW |
819 | } |
820 | ||
821 | mutex_lock(&vdev->igate); | |
822 | ||
823 | ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index, | |
824 | hdr.start, hdr.count, data); | |
825 | ||
826 | mutex_unlock(&vdev->igate); | |
827 | kfree(data); | |
828 | ||
829 | return ret; | |
830 | ||
8b27ee60 | 831 | } else if (cmd == VFIO_DEVICE_RESET) { |
89e1f7d4 | 832 | return vdev->reset_works ? |
890ed578 | 833 | pci_try_reset_function(vdev->pdev) : -EINVAL; |
89e1f7d4 | 834 | |
8b27ee60 AW |
835 | } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) { |
836 | struct vfio_pci_hot_reset_info hdr; | |
837 | struct vfio_pci_fill_info fill = { 0 }; | |
838 | struct vfio_pci_dependent_device *devices = NULL; | |
839 | bool slot = false; | |
840 | int ret = 0; | |
841 | ||
842 | minsz = offsetofend(struct vfio_pci_hot_reset_info, count); | |
843 | ||
844 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
845 | return -EFAULT; | |
846 | ||
847 | if (hdr.argsz < minsz) | |
848 | return -EINVAL; | |
849 | ||
850 | hdr.flags = 0; | |
851 | ||
852 | /* Can we do a slot or bus reset or neither? */ | |
853 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
854 | slot = true; | |
855 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
856 | return -ENODEV; | |
857 | ||
858 | /* How many devices are affected? */ | |
859 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
860 | vfio_pci_count_devs, | |
861 | &fill.max, slot); | |
862 | if (ret) | |
863 | return ret; | |
864 | ||
865 | WARN_ON(!fill.max); /* Should always be at least one */ | |
866 | ||
867 | /* | |
868 | * If there's enough space, fill it now, otherwise return | |
869 | * -ENOSPC and the number of devices affected. | |
870 | */ | |
871 | if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) { | |
872 | ret = -ENOSPC; | |
873 | hdr.count = fill.max; | |
874 | goto reset_info_exit; | |
875 | } | |
876 | ||
877 | devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL); | |
878 | if (!devices) | |
879 | return -ENOMEM; | |
880 | ||
881 | fill.devices = devices; | |
882 | ||
883 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
884 | vfio_pci_fill_devs, | |
885 | &fill, slot); | |
886 | ||
887 | /* | |
888 | * If a device was removed between counting and filling, | |
889 | * we may come up short of fill.max. If a device was | |
890 | * added, we'll have a return of -EAGAIN above. | |
891 | */ | |
892 | if (!ret) | |
893 | hdr.count = fill.cur; | |
894 | ||
895 | reset_info_exit: | |
896 | if (copy_to_user((void __user *)arg, &hdr, minsz)) | |
897 | ret = -EFAULT; | |
898 | ||
899 | if (!ret) { | |
900 | if (copy_to_user((void __user *)(arg + minsz), devices, | |
901 | hdr.count * sizeof(*devices))) | |
902 | ret = -EFAULT; | |
903 | } | |
904 | ||
905 | kfree(devices); | |
906 | return ret; | |
907 | ||
908 | } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) { | |
909 | struct vfio_pci_hot_reset hdr; | |
910 | int32_t *group_fds; | |
911 | struct vfio_pci_group_entry *groups; | |
912 | struct vfio_pci_group_info info; | |
913 | bool slot = false; | |
914 | int i, count = 0, ret = 0; | |
915 | ||
916 | minsz = offsetofend(struct vfio_pci_hot_reset, count); | |
917 | ||
918 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
919 | return -EFAULT; | |
920 | ||
921 | if (hdr.argsz < minsz || hdr.flags) | |
922 | return -EINVAL; | |
923 | ||
924 | /* Can we do a slot or bus reset or neither? */ | |
925 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
926 | slot = true; | |
927 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
928 | return -ENODEV; | |
929 | ||
930 | /* | |
931 | * We can't let userspace give us an arbitrarily large | |
932 | * buffer to copy, so verify how many we think there | |
933 | * could be. Note groups can have multiple devices so | |
934 | * one group per device is the max. | |
935 | */ | |
936 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
937 | vfio_pci_count_devs, | |
938 | &count, slot); | |
939 | if (ret) | |
940 | return ret; | |
941 | ||
942 | /* Somewhere between 1 and count is OK */ | |
943 | if (!hdr.count || hdr.count > count) | |
944 | return -EINVAL; | |
945 | ||
946 | group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL); | |
947 | groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL); | |
948 | if (!group_fds || !groups) { | |
949 | kfree(group_fds); | |
950 | kfree(groups); | |
951 | return -ENOMEM; | |
952 | } | |
953 | ||
954 | if (copy_from_user(group_fds, (void __user *)(arg + minsz), | |
955 | hdr.count * sizeof(*group_fds))) { | |
956 | kfree(group_fds); | |
957 | kfree(groups); | |
958 | return -EFAULT; | |
959 | } | |
960 | ||
961 | /* | |
962 | * For each group_fd, get the group through the vfio external | |
963 | * user interface and store the group and iommu ID. This | |
964 | * ensures the group is held across the reset. | |
965 | */ | |
966 | for (i = 0; i < hdr.count; i++) { | |
967 | struct vfio_group *group; | |
968 | struct fd f = fdget(group_fds[i]); | |
969 | if (!f.file) { | |
970 | ret = -EBADF; | |
971 | break; | |
972 | } | |
973 | ||
974 | group = vfio_group_get_external_user(f.file); | |
975 | fdput(f); | |
976 | if (IS_ERR(group)) { | |
977 | ret = PTR_ERR(group); | |
978 | break; | |
979 | } | |
980 | ||
981 | groups[i].group = group; | |
982 | groups[i].id = vfio_external_user_iommu_id(group); | |
983 | } | |
984 | ||
985 | kfree(group_fds); | |
986 | ||
987 | /* release reference to groups on error */ | |
988 | if (ret) | |
989 | goto hot_reset_release; | |
990 | ||
991 | info.count = hdr.count; | |
992 | info.groups = groups; | |
993 | ||
994 | /* | |
995 | * Test whether all the affected devices are contained | |
996 | * by the set of groups provided by the user. | |
997 | */ | |
998 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
999 | vfio_pci_validate_devs, | |
1000 | &info, slot); | |
1001 | if (!ret) | |
1002 | /* User has access, do the reset */ | |
890ed578 AW |
1003 | ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : |
1004 | pci_try_reset_bus(vdev->pdev->bus); | |
8b27ee60 AW |
1005 | |
1006 | hot_reset_release: | |
1007 | for (i--; i >= 0; i--) | |
1008 | vfio_group_put_external_user(groups[i].group); | |
1009 | ||
1010 | kfree(groups); | |
1011 | return ret; | |
1012 | } | |
1013 | ||
89e1f7d4 AW |
1014 | return -ENOTTY; |
1015 | } | |
1016 | ||
5b279a11 AW |
1017 | static ssize_t vfio_pci_rw(void *device_data, char __user *buf, |
1018 | size_t count, loff_t *ppos, bool iswrite) | |
89e1f7d4 AW |
1019 | { |
1020 | unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); | |
1021 | struct vfio_pci_device *vdev = device_data; | |
89e1f7d4 | 1022 | |
28541d41 | 1023 | if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions) |
89e1f7d4 AW |
1024 | return -EINVAL; |
1025 | ||
5b279a11 AW |
1026 | switch (index) { |
1027 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
906ee99d AW |
1028 | return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite); |
1029 | ||
5b279a11 AW |
1030 | case VFIO_PCI_ROM_REGION_INDEX: |
1031 | if (iswrite) | |
1032 | return -EINVAL; | |
906ee99d | 1033 | return vfio_pci_bar_rw(vdev, buf, count, ppos, false); |
89e1f7d4 | 1034 | |
5b279a11 | 1035 | case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: |
906ee99d | 1036 | return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); |
84237a82 AW |
1037 | |
1038 | case VFIO_PCI_VGA_REGION_INDEX: | |
1039 | return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); | |
28541d41 AW |
1040 | default: |
1041 | index -= VFIO_PCI_NUM_REGIONS; | |
1042 | return vdev->region[index].ops->rw(vdev, buf, | |
1043 | count, ppos, iswrite); | |
5b279a11 AW |
1044 | } |
1045 | ||
89e1f7d4 AW |
1046 | return -EINVAL; |
1047 | } | |
1048 | ||
5b279a11 AW |
1049 | static ssize_t vfio_pci_read(void *device_data, char __user *buf, |
1050 | size_t count, loff_t *ppos) | |
1051 | { | |
906ee99d AW |
1052 | if (!count) |
1053 | return 0; | |
1054 | ||
5b279a11 AW |
1055 | return vfio_pci_rw(device_data, buf, count, ppos, false); |
1056 | } | |
1057 | ||
89e1f7d4 AW |
1058 | static ssize_t vfio_pci_write(void *device_data, const char __user *buf, |
1059 | size_t count, loff_t *ppos) | |
1060 | { | |
906ee99d AW |
1061 | if (!count) |
1062 | return 0; | |
1063 | ||
1064 | return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true); | |
89e1f7d4 AW |
1065 | } |
1066 | ||
1067 | static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) | |
1068 | { | |
1069 | struct vfio_pci_device *vdev = device_data; | |
1070 | struct pci_dev *pdev = vdev->pdev; | |
1071 | unsigned int index; | |
34002f54 | 1072 | u64 phys_len, req_len, pgoff, req_start; |
89e1f7d4 AW |
1073 | int ret; |
1074 | ||
1075 | index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); | |
1076 | ||
1077 | if (vma->vm_end < vma->vm_start) | |
1078 | return -EINVAL; | |
1079 | if ((vma->vm_flags & VM_SHARED) == 0) | |
1080 | return -EINVAL; | |
1081 | if (index >= VFIO_PCI_ROM_REGION_INDEX) | |
1082 | return -EINVAL; | |
05f0c03f | 1083 | if (!vdev->bar_mmap_supported[index]) |
89e1f7d4 AW |
1084 | return -EINVAL; |
1085 | ||
05f0c03f | 1086 | phys_len = PAGE_ALIGN(pci_resource_len(pdev, index)); |
89e1f7d4 AW |
1087 | req_len = vma->vm_end - vma->vm_start; |
1088 | pgoff = vma->vm_pgoff & | |
1089 | ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); | |
1090 | req_start = pgoff << PAGE_SHIFT; | |
1091 | ||
05f0c03f | 1092 | if (req_start + req_len > phys_len) |
89e1f7d4 AW |
1093 | return -EINVAL; |
1094 | ||
89e1f7d4 AW |
1095 | /* |
1096 | * Even though we don't make use of the barmap for the mmap, | |
1097 | * we need to request the region and the barmap tracks that. | |
1098 | */ | |
1099 | if (!vdev->barmap[index]) { | |
1100 | ret = pci_request_selected_regions(pdev, | |
1101 | 1 << index, "vfio-pci"); | |
1102 | if (ret) | |
1103 | return ret; | |
1104 | ||
1105 | vdev->barmap[index] = pci_iomap(pdev, index, 0); | |
e19f32da AY |
1106 | if (!vdev->barmap[index]) { |
1107 | pci_release_selected_regions(pdev, 1 << index); | |
1108 | return -ENOMEM; | |
1109 | } | |
89e1f7d4 AW |
1110 | } |
1111 | ||
1112 | vma->vm_private_data = vdev; | |
89e1f7d4 | 1113 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
34002f54 | 1114 | vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff; |
89e1f7d4 | 1115 | |
34002f54 | 1116 | return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
89e1f7d4 AW |
1117 | req_len, vma->vm_page_prot); |
1118 | } | |
1119 | ||
6140a8f5 AW |
1120 | static void vfio_pci_request(void *device_data, unsigned int count) |
1121 | { | |
1122 | struct vfio_pci_device *vdev = device_data; | |
1123 | ||
1124 | mutex_lock(&vdev->igate); | |
1125 | ||
1126 | if (vdev->req_trigger) { | |
5f55d2ae AW |
1127 | if (!(count % 10)) |
1128 | dev_notice_ratelimited(&vdev->pdev->dev, | |
1129 | "Relaying device request to user (#%u)\n", | |
1130 | count); | |
6140a8f5 | 1131 | eventfd_signal(vdev->req_trigger, 1); |
5f55d2ae AW |
1132 | } else if (count == 0) { |
1133 | dev_warn(&vdev->pdev->dev, | |
1134 | "No device request channel registered, blocked until released by user\n"); | |
6140a8f5 AW |
1135 | } |
1136 | ||
1137 | mutex_unlock(&vdev->igate); | |
1138 | } | |
1139 | ||
89e1f7d4 AW |
1140 | static const struct vfio_device_ops vfio_pci_ops = { |
1141 | .name = "vfio-pci", | |
1142 | .open = vfio_pci_open, | |
1143 | .release = vfio_pci_release, | |
1144 | .ioctl = vfio_pci_ioctl, | |
1145 | .read = vfio_pci_read, | |
1146 | .write = vfio_pci_write, | |
1147 | .mmap = vfio_pci_mmap, | |
6140a8f5 | 1148 | .request = vfio_pci_request, |
89e1f7d4 AW |
1149 | }; |
1150 | ||
1151 | static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) | |
1152 | { | |
89e1f7d4 AW |
1153 | struct vfio_pci_device *vdev; |
1154 | struct iommu_group *group; | |
1155 | int ret; | |
1156 | ||
7c2e211f | 1157 | if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL) |
89e1f7d4 AW |
1158 | return -EINVAL; |
1159 | ||
03a76b60 | 1160 | group = vfio_iommu_group_get(&pdev->dev); |
89e1f7d4 AW |
1161 | if (!group) |
1162 | return -EINVAL; | |
1163 | ||
1164 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); | |
1165 | if (!vdev) { | |
03a76b60 | 1166 | vfio_iommu_group_put(group, &pdev->dev); |
89e1f7d4 AW |
1167 | return -ENOMEM; |
1168 | } | |
1169 | ||
1170 | vdev->pdev = pdev; | |
1171 | vdev->irq_type = VFIO_PCI_NUM_IRQS; | |
1172 | mutex_init(&vdev->igate); | |
1173 | spin_lock_init(&vdev->irqlock); | |
89e1f7d4 AW |
1174 | |
1175 | ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); | |
1176 | if (ret) { | |
03a76b60 | 1177 | vfio_iommu_group_put(group, &pdev->dev); |
89e1f7d4 | 1178 | kfree(vdev); |
5a0ff177 | 1179 | return ret; |
89e1f7d4 AW |
1180 | } |
1181 | ||
ecaa1f6a AW |
1182 | if (vfio_pci_is_vga(pdev)) { |
1183 | vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode); | |
1184 | vga_set_legacy_decoding(pdev, | |
1185 | vfio_pci_set_vga_decode(vdev, false)); | |
1186 | } | |
1187 | ||
6eb70187 AW |
1188 | if (!disable_idle_d3) { |
1189 | /* | |
1190 | * pci-core sets the device power state to an unknown value at | |
1191 | * bootup and after being removed from a driver. The only | |
1192 | * transition it allows from this unknown state is to D0, which | |
1193 | * typically happens when a driver calls pci_enable_device(). | |
1194 | * We're not ready to enable the device yet, but we do want to | |
1195 | * be able to get to D3. Therefore first do a D0 transition | |
1196 | * before going to D3. | |
1197 | */ | |
1198 | pci_set_power_state(pdev, PCI_D0); | |
1199 | pci_set_power_state(pdev, PCI_D3hot); | |
1200 | } | |
1201 | ||
89e1f7d4 AW |
1202 | return ret; |
1203 | } | |
1204 | ||
1205 | static void vfio_pci_remove(struct pci_dev *pdev) | |
1206 | { | |
1207 | struct vfio_pci_device *vdev; | |
1208 | ||
1209 | vdev = vfio_del_group_dev(&pdev->dev); | |
ecaa1f6a AW |
1210 | if (!vdev) |
1211 | return; | |
1212 | ||
03a76b60 | 1213 | vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev); |
28541d41 | 1214 | kfree(vdev->region); |
ecaa1f6a AW |
1215 | kfree(vdev); |
1216 | ||
1217 | if (vfio_pci_is_vga(pdev)) { | |
1218 | vga_client_register(pdev, NULL, NULL, NULL); | |
1219 | vga_set_legacy_decoding(pdev, | |
1220 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | | |
1221 | VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); | |
61d79256 | 1222 | } |
6eb70187 AW |
1223 | |
1224 | if (!disable_idle_d3) | |
1225 | pci_set_power_state(pdev, PCI_D0); | |
89e1f7d4 AW |
1226 | } |
1227 | ||
dad9f897 VMP |
1228 | static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, |
1229 | pci_channel_state_t state) | |
1230 | { | |
1231 | struct vfio_pci_device *vdev; | |
1232 | struct vfio_device *device; | |
1233 | ||
1234 | device = vfio_device_get_from_dev(&pdev->dev); | |
1235 | if (device == NULL) | |
1236 | return PCI_ERS_RESULT_DISCONNECT; | |
1237 | ||
1238 | vdev = vfio_device_data(device); | |
1239 | if (vdev == NULL) { | |
1240 | vfio_device_put(device); | |
1241 | return PCI_ERS_RESULT_DISCONNECT; | |
1242 | } | |
1243 | ||
3be3a074 AW |
1244 | mutex_lock(&vdev->igate); |
1245 | ||
dad9f897 VMP |
1246 | if (vdev->err_trigger) |
1247 | eventfd_signal(vdev->err_trigger, 1); | |
1248 | ||
3be3a074 AW |
1249 | mutex_unlock(&vdev->igate); |
1250 | ||
dad9f897 VMP |
1251 | vfio_device_put(device); |
1252 | ||
1253 | return PCI_ERS_RESULT_CAN_RECOVER; | |
1254 | } | |
1255 | ||
7d10f4e0 | 1256 | static const struct pci_error_handlers vfio_err_handlers = { |
dad9f897 VMP |
1257 | .error_detected = vfio_pci_aer_err_detected, |
1258 | }; | |
1259 | ||
89e1f7d4 AW |
1260 | static struct pci_driver vfio_pci_driver = { |
1261 | .name = "vfio-pci", | |
1262 | .id_table = NULL, /* only dynamic ids */ | |
1263 | .probe = vfio_pci_probe, | |
1264 | .remove = vfio_pci_remove, | |
dad9f897 | 1265 | .err_handler = &vfio_err_handlers, |
89e1f7d4 AW |
1266 | }; |
1267 | ||
93899a67 AW |
1268 | struct vfio_devices { |
1269 | struct vfio_device **devices; | |
1270 | int cur_index; | |
1271 | int max_index; | |
1272 | }; | |
bc4fba77 | 1273 | |
93899a67 | 1274 | static int vfio_pci_get_devs(struct pci_dev *pdev, void *data) |
bc4fba77 | 1275 | { |
93899a67 | 1276 | struct vfio_devices *devs = data; |
20f30017 | 1277 | struct vfio_device *device; |
bc4fba77 | 1278 | |
93899a67 AW |
1279 | if (devs->cur_index == devs->max_index) |
1280 | return -ENOSPC; | |
bc4fba77 | 1281 | |
20f30017 AW |
1282 | device = vfio_device_get_from_dev(&pdev->dev); |
1283 | if (!device) | |
93899a67 | 1284 | return -EINVAL; |
bc4fba77 | 1285 | |
20f30017 AW |
1286 | if (pci_dev_driver(pdev) != &vfio_pci_driver) { |
1287 | vfio_device_put(device); | |
1288 | return -EBUSY; | |
1289 | } | |
1290 | ||
1291 | devs->devices[devs->cur_index++] = device; | |
bc4fba77 AW |
1292 | return 0; |
1293 | } | |
1294 | ||
1295 | /* | |
1296 | * Attempt to do a bus/slot reset if there are devices affected by a reset for | |
1297 | * this device that are needs_reset and all of the affected devices are unused | |
93899a67 AW |
1298 | * (!refcnt). Callers are required to hold driver_lock when calling this to |
1299 | * prevent device opens and concurrent bus reset attempts. We prevent device | |
1300 | * unbinds by acquiring and holding a reference to the vfio_device. | |
1301 | * | |
1302 | * NB: vfio-core considers a group to be viable even if some devices are | |
1303 | * bound to drivers like pci-stub or pcieport. Here we require all devices | |
1304 | * to be bound to vfio_pci since that's the only way we can be sure they | |
1305 | * stay put. | |
bc4fba77 AW |
1306 | */ |
1307 | static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) | |
1308 | { | |
93899a67 AW |
1309 | struct vfio_devices devs = { .cur_index = 0 }; |
1310 | int i = 0, ret = -EINVAL; | |
bc4fba77 | 1311 | bool needs_reset = false, slot = false; |
93899a67 | 1312 | struct vfio_pci_device *tmp; |
bc4fba77 AW |
1313 | |
1314 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
1315 | slot = true; | |
1316 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
1317 | return; | |
1318 | ||
93899a67 AW |
1319 | if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs, |
1320 | &i, slot) || !i) | |
bc4fba77 AW |
1321 | return; |
1322 | ||
93899a67 AW |
1323 | devs.max_index = i; |
1324 | devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL); | |
1325 | if (!devs.devices) | |
bc4fba77 AW |
1326 | return; |
1327 | ||
93899a67 AW |
1328 | if (vfio_pci_for_each_slot_or_bus(vdev->pdev, |
1329 | vfio_pci_get_devs, &devs, slot)) | |
1330 | goto put_devs; | |
1331 | ||
1332 | for (i = 0; i < devs.cur_index; i++) { | |
1333 | tmp = vfio_device_data(devs.devices[i]); | |
1334 | if (tmp->needs_reset) | |
1335 | needs_reset = true; | |
1336 | if (tmp->refcnt) | |
1337 | goto put_devs; | |
1338 | } | |
1339 | ||
1340 | if (needs_reset) | |
1341 | ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : | |
1342 | pci_try_reset_bus(vdev->pdev->bus); | |
1343 | ||
1344 | put_devs: | |
1345 | for (i = 0; i < devs.cur_index; i++) { | |
6eb70187 AW |
1346 | tmp = vfio_device_data(devs.devices[i]); |
1347 | if (!ret) | |
93899a67 | 1348 | tmp->needs_reset = false; |
6eb70187 AW |
1349 | |
1350 | if (!tmp->refcnt && !disable_idle_d3) | |
1351 | pci_set_power_state(tmp->pdev, PCI_D3hot); | |
1352 | ||
93899a67 AW |
1353 | vfio_device_put(devs.devices[i]); |
1354 | } | |
1355 | ||
1356 | kfree(devs.devices); | |
bc4fba77 AW |
1357 | } |
1358 | ||
89e1f7d4 AW |
1359 | static void __exit vfio_pci_cleanup(void) |
1360 | { | |
1361 | pci_unregister_driver(&vfio_pci_driver); | |
89e1f7d4 AW |
1362 | vfio_pci_uninit_perm_bits(); |
1363 | } | |
1364 | ||
80c7e8cc AW |
1365 | static void __init vfio_pci_fill_ids(void) |
1366 | { | |
1367 | char *p, *id; | |
1368 | int rc; | |
1369 | ||
1370 | /* no ids passed actually */ | |
1371 | if (ids[0] == '\0') | |
1372 | return; | |
1373 | ||
1374 | /* add ids specified in the module parameter */ | |
1375 | p = ids; | |
1376 | while ((id = strsep(&p, ","))) { | |
1377 | unsigned int vendor, device, subvendor = PCI_ANY_ID, | |
1378 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
1379 | int fields; | |
1380 | ||
1381 | if (!strlen(id)) | |
1382 | continue; | |
1383 | ||
1384 | fields = sscanf(id, "%x:%x:%x:%x:%x:%x", | |
1385 | &vendor, &device, &subvendor, &subdevice, | |
1386 | &class, &class_mask); | |
1387 | ||
1388 | if (fields < 2) { | |
1389 | pr_warn("invalid id string \"%s\"\n", id); | |
1390 | continue; | |
1391 | } | |
1392 | ||
1393 | rc = pci_add_dynid(&vfio_pci_driver, vendor, device, | |
1394 | subvendor, subdevice, class, class_mask, 0); | |
1395 | if (rc) | |
1396 | pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", | |
1397 | vendor, device, subvendor, subdevice, | |
1398 | class, class_mask, rc); | |
1399 | else | |
1400 | pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", | |
1401 | vendor, device, subvendor, subdevice, | |
1402 | class, class_mask); | |
1403 | } | |
1404 | } | |
1405 | ||
89e1f7d4 AW |
1406 | static int __init vfio_pci_init(void) |
1407 | { | |
1408 | int ret; | |
1409 | ||
1410 | /* Allocate shared config space permision data used by all devices */ | |
1411 | ret = vfio_pci_init_perm_bits(); | |
1412 | if (ret) | |
1413 | return ret; | |
1414 | ||
89e1f7d4 AW |
1415 | /* Register and scan for devices */ |
1416 | ret = pci_register_driver(&vfio_pci_driver); | |
1417 | if (ret) | |
1418 | goto out_driver; | |
1419 | ||
80c7e8cc AW |
1420 | vfio_pci_fill_ids(); |
1421 | ||
89e1f7d4 AW |
1422 | return 0; |
1423 | ||
89e1f7d4 AW |
1424 | out_driver: |
1425 | vfio_pci_uninit_perm_bits(); | |
1426 | return ret; | |
1427 | } | |
1428 | ||
1429 | module_init(vfio_pci_init); | |
1430 | module_exit(vfio_pci_cleanup); | |
1431 | ||
1432 | MODULE_VERSION(DRIVER_VERSION); | |
1433 | MODULE_LICENSE("GPL v2"); | |
1434 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1435 | MODULE_DESCRIPTION(DRIVER_DESC); |