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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
89e1f7d4 AW |
2 | /* |
3 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. | |
4 | * Author: Alex Williamson <alex.williamson@redhat.com> | |
5 | * | |
89e1f7d4 AW |
6 | * Derived from original vfio: |
7 | * Copyright 2010 Cisco Systems, Inc. All rights reserved. | |
8 | * Author: Tom Lyon, pugs@cisco.com | |
9 | */ | |
10 | ||
80c7e8cc AW |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
89e1f7d4 AW |
13 | #include <linux/device.h> |
14 | #include <linux/eventfd.h> | |
8b27ee60 | 15 | #include <linux/file.h> |
89e1f7d4 AW |
16 | #include <linux/interrupt.h> |
17 | #include <linux/iommu.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/notifier.h> | |
21 | #include <linux/pci.h> | |
22 | #include <linux/pm_runtime.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/uaccess.h> | |
26 | #include <linux/vfio.h> | |
ecaa1f6a | 27 | #include <linux/vgaarb.h> |
0e714d27 | 28 | #include <linux/nospec.h> |
abafbc55 | 29 | #include <linux/sched/mm.h> |
89e1f7d4 AW |
30 | |
31 | #include "vfio_pci_private.h" | |
32 | ||
33 | #define DRIVER_VERSION "0.2" | |
34 | #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>" | |
35 | #define DRIVER_DESC "VFIO PCI - User Level meta-driver" | |
36 | ||
80c7e8cc AW |
37 | static char ids[1024] __initdata; |
38 | module_param_string(ids, ids, sizeof(ids), 0); | |
39 | 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"); | |
40 | ||
89e1f7d4 AW |
41 | static bool nointxmask; |
42 | module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR); | |
43 | MODULE_PARM_DESC(nointxmask, | |
44 | "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."); | |
45 | ||
88c0dead AW |
46 | #ifdef CONFIG_VFIO_PCI_VGA |
47 | static bool disable_vga; | |
48 | module_param(disable_vga, bool, S_IRUGO); | |
49 | MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci"); | |
50 | #endif | |
51 | ||
6eb70187 AW |
52 | static bool disable_idle_d3; |
53 | module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR); | |
54 | MODULE_PARM_DESC(disable_idle_d3, | |
55 | "Disable using the PCI D3 low power state for idle, unused devices"); | |
56 | ||
137e5531 AW |
57 | static bool enable_sriov; |
58 | #ifdef CONFIG_PCI_IOV | |
59 | module_param(enable_sriov, bool, 0644); | |
60 | MODULE_PARM_DESC(enable_sriov, "Enable support for SR-IOV configuration. Enabling SR-IOV on a PF typically requires support of the userspace PF driver, enabling VFs without such support may result in non-functional VFs or PF."); | |
61 | #endif | |
62 | ||
88c0dead AW |
63 | static inline bool vfio_vga_disabled(void) |
64 | { | |
65 | #ifdef CONFIG_VFIO_PCI_VGA | |
66 | return disable_vga; | |
67 | #else | |
68 | return true; | |
69 | #endif | |
70 | } | |
71 | ||
ecaa1f6a AW |
72 | /* |
73 | * Our VGA arbiter participation is limited since we don't know anything | |
74 | * about the device itself. However, if the device is the only VGA device | |
75 | * downstream of a bridge and VFIO VGA support is disabled, then we can | |
76 | * safely return legacy VGA IO and memory as not decoded since the user | |
77 | * has no way to get to it and routing can be disabled externally at the | |
78 | * bridge. | |
79 | */ | |
80 | static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga) | |
81 | { | |
82 | struct vfio_pci_device *vdev = opaque; | |
83 | struct pci_dev *tmp = NULL, *pdev = vdev->pdev; | |
84 | unsigned char max_busnr; | |
85 | unsigned int decodes; | |
86 | ||
87 | if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus)) | |
88 | return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | | |
89 | VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; | |
90 | ||
91 | max_busnr = pci_bus_max_busnr(pdev->bus); | |
92 | decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; | |
93 | ||
94 | while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) { | |
95 | if (tmp == pdev || | |
96 | pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) || | |
97 | pci_is_root_bus(tmp->bus)) | |
98 | continue; | |
99 | ||
100 | if (tmp->bus->number >= pdev->bus->number && | |
101 | tmp->bus->number <= max_busnr) { | |
102 | pci_dev_put(tmp); | |
103 | decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; | |
104 | break; | |
105 | } | |
106 | } | |
107 | ||
108 | return decodes; | |
109 | } | |
110 | ||
111 | static inline bool vfio_pci_is_vga(struct pci_dev *pdev) | |
112 | { | |
113 | return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; | |
114 | } | |
115 | ||
05f0c03f YX |
116 | static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev) |
117 | { | |
118 | struct resource *res; | |
c9c13ba4 | 119 | int i; |
05f0c03f YX |
120 | struct vfio_pci_dummy_resource *dummy_res; |
121 | ||
122 | INIT_LIST_HEAD(&vdev->dummy_resources_list); | |
123 | ||
c9c13ba4 DE |
124 | for (i = 0; i < PCI_STD_NUM_BARS; i++) { |
125 | int bar = i + PCI_STD_RESOURCES; | |
126 | ||
127 | res = &vdev->pdev->resource[bar]; | |
05f0c03f YX |
128 | |
129 | if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP)) | |
130 | goto no_mmap; | |
131 | ||
132 | if (!(res->flags & IORESOURCE_MEM)) | |
133 | goto no_mmap; | |
134 | ||
135 | /* | |
136 | * The PCI core shouldn't set up a resource with a | |
137 | * type but zero size. But there may be bugs that | |
138 | * cause us to do that. | |
139 | */ | |
140 | if (!resource_size(res)) | |
141 | goto no_mmap; | |
142 | ||
143 | if (resource_size(res) >= PAGE_SIZE) { | |
144 | vdev->bar_mmap_supported[bar] = true; | |
145 | continue; | |
146 | } | |
147 | ||
148 | if (!(res->start & ~PAGE_MASK)) { | |
149 | /* | |
150 | * Add a dummy resource to reserve the remainder | |
151 | * of the exclusive page in case that hot-add | |
152 | * device's bar is assigned into it. | |
153 | */ | |
154 | dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL); | |
155 | if (dummy_res == NULL) | |
156 | goto no_mmap; | |
157 | ||
158 | dummy_res->resource.name = "vfio sub-page reserved"; | |
159 | dummy_res->resource.start = res->end + 1; | |
160 | dummy_res->resource.end = res->start + PAGE_SIZE - 1; | |
161 | dummy_res->resource.flags = res->flags; | |
162 | if (request_resource(res->parent, | |
163 | &dummy_res->resource)) { | |
164 | kfree(dummy_res); | |
165 | goto no_mmap; | |
166 | } | |
167 | dummy_res->index = bar; | |
168 | list_add(&dummy_res->res_next, | |
169 | &vdev->dummy_resources_list); | |
170 | vdev->bar_mmap_supported[bar] = true; | |
171 | continue; | |
172 | } | |
173 | /* | |
174 | * Here we don't handle the case when the BAR is not page | |
175 | * aligned because we can't expect the BAR will be | |
176 | * assigned into the same location in a page in guest | |
177 | * when we passthrough the BAR. And it's hard to access | |
178 | * this BAR in userspace because we have no way to get | |
179 | * the BAR's location in a page. | |
180 | */ | |
181 | no_mmap: | |
182 | vdev->bar_mmap_supported[bar] = false; | |
183 | } | |
184 | } | |
185 | ||
bc4fba77 | 186 | static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev); |
f572a960 | 187 | static void vfio_pci_disable(struct vfio_pci_device *vdev); |
abafbc55 | 188 | static int vfio_pci_try_zap_and_vma_lock_cb(struct pci_dev *pdev, void *data); |
bc4fba77 | 189 | |
45074405 AW |
190 | /* |
191 | * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND | |
192 | * _and_ the ability detect when the device is asserting INTx via PCI_STATUS. | |
193 | * If a device implements the former but not the latter we would typically | |
194 | * expect broken_intx_masking be set and require an exclusive interrupt. | |
195 | * However since we do have control of the device's ability to assert INTx, | |
196 | * we can instead pretend that the device does not implement INTx, virtualizing | |
197 | * the pin register to report zero and maintaining DisINTx set on the host. | |
198 | */ | |
199 | static bool vfio_pci_nointx(struct pci_dev *pdev) | |
200 | { | |
201 | switch (pdev->vendor) { | |
202 | case PCI_VENDOR_ID_INTEL: | |
203 | switch (pdev->device) { | |
7d57e5e9 | 204 | /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */ |
45074405 AW |
205 | case 0x1572: |
206 | case 0x1574: | |
207 | case 0x1580 ... 0x1581: | |
7d57e5e9 | 208 | case 0x1583 ... 0x158b: |
45074405 AW |
209 | case 0x37d0 ... 0x37d2: |
210 | return true; | |
211 | default: | |
212 | return false; | |
213 | } | |
214 | } | |
215 | ||
216 | return false; | |
217 | } | |
218 | ||
51ef3a00 AW |
219 | static void vfio_pci_probe_power_state(struct vfio_pci_device *vdev) |
220 | { | |
221 | struct pci_dev *pdev = vdev->pdev; | |
222 | u16 pmcsr; | |
223 | ||
224 | if (!pdev->pm_cap) | |
225 | return; | |
226 | ||
227 | pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &pmcsr); | |
228 | ||
229 | vdev->needs_pm_restore = !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET); | |
230 | } | |
231 | ||
232 | /* | |
233 | * pci_set_power_state() wrapper handling devices which perform a soft reset on | |
234 | * D3->D0 transition. Save state prior to D0/1/2->D3, stash it on the vdev, | |
235 | * restore when returned to D0. Saved separately from pci_saved_state for use | |
236 | * by PM capability emulation and separately from pci_dev internal saved state | |
237 | * to avoid it being overwritten and consumed around other resets. | |
238 | */ | |
239 | int vfio_pci_set_power_state(struct vfio_pci_device *vdev, pci_power_t state) | |
240 | { | |
241 | struct pci_dev *pdev = vdev->pdev; | |
242 | bool needs_restore = false, needs_save = false; | |
243 | int ret; | |
244 | ||
245 | if (vdev->needs_pm_restore) { | |
246 | if (pdev->current_state < PCI_D3hot && state >= PCI_D3hot) { | |
247 | pci_save_state(pdev); | |
248 | needs_save = true; | |
249 | } | |
250 | ||
251 | if (pdev->current_state >= PCI_D3hot && state <= PCI_D0) | |
252 | needs_restore = true; | |
253 | } | |
254 | ||
255 | ret = pci_set_power_state(pdev, state); | |
256 | ||
257 | if (!ret) { | |
258 | /* D3 might be unsupported via quirk, skip unless in D3 */ | |
259 | if (needs_save && pdev->current_state >= PCI_D3hot) { | |
260 | vdev->pm_save = pci_store_saved_state(pdev); | |
261 | } else if (needs_restore) { | |
262 | pci_load_and_free_saved_state(pdev, &vdev->pm_save); | |
263 | pci_restore_state(pdev); | |
264 | } | |
265 | } | |
266 | ||
267 | return ret; | |
268 | } | |
269 | ||
89e1f7d4 AW |
270 | static int vfio_pci_enable(struct vfio_pci_device *vdev) |
271 | { | |
272 | struct pci_dev *pdev = vdev->pdev; | |
273 | int ret; | |
274 | u16 cmd; | |
275 | u8 msix_pos; | |
276 | ||
51ef3a00 | 277 | vfio_pci_set_power_state(vdev, PCI_D0); |
6eb70187 | 278 | |
9c22e660 AW |
279 | /* Don't allow our initial saved state to include busmaster */ |
280 | pci_clear_master(pdev); | |
281 | ||
9a92c509 AW |
282 | ret = pci_enable_device(pdev); |
283 | if (ret) | |
284 | return ret; | |
285 | ||
9f478035 AW |
286 | /* If reset fails because of the device lock, fail this path entirely */ |
287 | ret = pci_try_reset_function(pdev); | |
288 | if (ret == -EAGAIN) { | |
289 | pci_disable_device(pdev); | |
290 | return ret; | |
291 | } | |
292 | ||
293 | vdev->reset_works = !ret; | |
89e1f7d4 AW |
294 | pci_save_state(pdev); |
295 | vdev->pci_saved_state = pci_store_saved_state(pdev); | |
296 | if (!vdev->pci_saved_state) | |
a88a7b3e | 297 | pci_dbg(pdev, "%s: Couldn't store saved state\n", __func__); |
89e1f7d4 | 298 | |
45074405 AW |
299 | if (likely(!nointxmask)) { |
300 | if (vfio_pci_nointx(pdev)) { | |
a88a7b3e | 301 | pci_info(pdev, "Masking broken INTx support\n"); |
45074405 AW |
302 | vdev->nointx = true; |
303 | pci_intx(pdev, 0); | |
304 | } else | |
305 | vdev->pci_2_3 = pci_intx_mask_supported(pdev); | |
9a92c509 | 306 | } |
89e1f7d4 | 307 | |
89e1f7d4 AW |
308 | pci_read_config_word(pdev, PCI_COMMAND, &cmd); |
309 | if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) { | |
310 | cmd &= ~PCI_COMMAND_INTX_DISABLE; | |
311 | pci_write_config_word(pdev, PCI_COMMAND, cmd); | |
312 | } | |
313 | ||
45074405 AW |
314 | ret = vfio_config_init(vdev); |
315 | if (ret) { | |
316 | kfree(vdev->pci_saved_state); | |
317 | vdev->pci_saved_state = NULL; | |
318 | pci_disable_device(pdev); | |
319 | return ret; | |
320 | } | |
321 | ||
a9047f24 | 322 | msix_pos = pdev->msix_cap; |
89e1f7d4 AW |
323 | if (msix_pos) { |
324 | u16 flags; | |
325 | u32 table; | |
326 | ||
327 | pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags); | |
328 | pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table); | |
329 | ||
508d1aa6 BH |
330 | vdev->msix_bar = table & PCI_MSIX_TABLE_BIR; |
331 | vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET; | |
89e1f7d4 AW |
332 | vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16; |
333 | } else | |
334 | vdev->msix_bar = 0xFF; | |
335 | ||
ecaa1f6a | 336 | if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev)) |
84237a82 | 337 | vdev->has_vga = true; |
84237a82 | 338 | |
5846ff54 | 339 | |
f572a960 AW |
340 | if (vfio_pci_is_vga(pdev) && |
341 | pdev->vendor == PCI_VENDOR_ID_INTEL && | |
342 | IS_ENABLED(CONFIG_VFIO_PCI_IGD)) { | |
343 | ret = vfio_pci_igd_init(vdev); | |
344 | if (ret) { | |
a88a7b3e | 345 | pci_warn(pdev, "Failed to setup Intel IGD regions\n"); |
7f928917 AK |
346 | goto disable_exit; |
347 | } | |
348 | } | |
349 | ||
350 | if (pdev->vendor == PCI_VENDOR_ID_NVIDIA && | |
351 | IS_ENABLED(CONFIG_VFIO_PCI_NVLINK2)) { | |
352 | ret = vfio_pci_nvdia_v100_nvlink2_init(vdev); | |
353 | if (ret && ret != -ENODEV) { | |
a88a7b3e | 354 | pci_warn(pdev, "Failed to setup NVIDIA NV2 RAM region\n"); |
7f928917 AK |
355 | goto disable_exit; |
356 | } | |
357 | } | |
358 | ||
359 | if (pdev->vendor == PCI_VENDOR_ID_IBM && | |
360 | IS_ENABLED(CONFIG_VFIO_PCI_NVLINK2)) { | |
361 | ret = vfio_pci_ibm_npu2_init(vdev); | |
362 | if (ret && ret != -ENODEV) { | |
a88a7b3e | 363 | pci_warn(pdev, "Failed to setup NVIDIA NV2 ATSD region\n"); |
7f928917 | 364 | goto disable_exit; |
f572a960 | 365 | } |
5846ff54 AW |
366 | } |
367 | ||
05f0c03f YX |
368 | vfio_pci_probe_mmaps(vdev); |
369 | ||
9a92c509 | 370 | return 0; |
7f928917 AK |
371 | |
372 | disable_exit: | |
373 | vfio_pci_disable(vdev); | |
374 | return ret; | |
89e1f7d4 AW |
375 | } |
376 | ||
377 | static void vfio_pci_disable(struct vfio_pci_device *vdev) | |
378 | { | |
2007722a | 379 | struct pci_dev *pdev = vdev->pdev; |
05f0c03f | 380 | struct vfio_pci_dummy_resource *dummy_res, *tmp; |
30656177 | 381 | struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp; |
28541d41 | 382 | int i, bar; |
89e1f7d4 | 383 | |
9c22e660 AW |
384 | /* Stop the device from further DMA */ |
385 | pci_clear_master(pdev); | |
89e1f7d4 AW |
386 | |
387 | vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE | | |
388 | VFIO_IRQ_SET_ACTION_TRIGGER, | |
389 | vdev->irq_type, 0, 0, NULL); | |
390 | ||
30656177 AW |
391 | /* Device closed, don't need mutex here */ |
392 | list_for_each_entry_safe(ioeventfd, ioeventfd_tmp, | |
393 | &vdev->ioeventfds_list, next) { | |
394 | vfio_virqfd_disable(&ioeventfd->virqfd); | |
395 | list_del(&ioeventfd->next); | |
396 | kfree(ioeventfd); | |
397 | } | |
398 | vdev->ioeventfds_nr = 0; | |
399 | ||
89e1f7d4 AW |
400 | vdev->virq_disabled = false; |
401 | ||
28541d41 AW |
402 | for (i = 0; i < vdev->num_regions; i++) |
403 | vdev->region[i].ops->release(vdev, &vdev->region[i]); | |
404 | ||
405 | vdev->num_regions = 0; | |
406 | kfree(vdev->region); | |
407 | vdev->region = NULL; /* don't krealloc a freed pointer */ | |
408 | ||
89e1f7d4 AW |
409 | vfio_config_free(vdev); |
410 | ||
c9c13ba4 DE |
411 | for (i = 0; i < PCI_STD_NUM_BARS; i++) { |
412 | bar = i + PCI_STD_RESOURCES; | |
89e1f7d4 AW |
413 | if (!vdev->barmap[bar]) |
414 | continue; | |
2007722a AW |
415 | pci_iounmap(pdev, vdev->barmap[bar]); |
416 | pci_release_selected_regions(pdev, 1 << bar); | |
89e1f7d4 AW |
417 | vdev->barmap[bar] = NULL; |
418 | } | |
2007722a | 419 | |
05f0c03f YX |
420 | list_for_each_entry_safe(dummy_res, tmp, |
421 | &vdev->dummy_resources_list, res_next) { | |
422 | list_del(&dummy_res->res_next); | |
423 | release_resource(&dummy_res->resource); | |
424 | kfree(dummy_res); | |
425 | } | |
426 | ||
bc4fba77 AW |
427 | vdev->needs_reset = true; |
428 | ||
2007722a AW |
429 | /* |
430 | * If we have saved state, restore it. If we can reset the device, | |
431 | * even better. Resetting with current state seems better than | |
432 | * nothing, but saving and restoring current state without reset | |
433 | * is just busy work. | |
434 | */ | |
435 | if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) { | |
a88a7b3e | 436 | pci_info(pdev, "%s: Couldn't reload saved state\n", __func__); |
2007722a AW |
437 | |
438 | if (!vdev->reset_works) | |
9c22e660 | 439 | goto out; |
2007722a AW |
440 | |
441 | pci_save_state(pdev); | |
442 | } | |
443 | ||
444 | /* | |
445 | * Disable INTx and MSI, presumably to avoid spurious interrupts | |
446 | * during reset. Stolen from pci_reset_function() | |
447 | */ | |
448 | pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); | |
449 | ||
d24cdbfd | 450 | /* |
92c80268 | 451 | * Try to get the locks ourselves to prevent a deadlock. The |
452 | * success of this is dependent on being able to lock the device, | |
453 | * which is not always possible. | |
454 | * We can not use the "try" reset interface here, which will | |
455 | * overwrite the previously restored configuration information. | |
d24cdbfd | 456 | */ |
92c80268 | 457 | if (vdev->reset_works && pci_cfg_access_trylock(pdev)) { |
458 | if (device_trylock(&pdev->dev)) { | |
459 | if (!__pci_reset_function_locked(pdev)) | |
460 | vdev->needs_reset = false; | |
461 | device_unlock(&pdev->dev); | |
462 | } | |
463 | pci_cfg_access_unlock(pdev); | |
464 | } | |
2007722a AW |
465 | |
466 | pci_restore_state(pdev); | |
9c22e660 AW |
467 | out: |
468 | pci_disable_device(pdev); | |
bc4fba77 AW |
469 | |
470 | vfio_pci_try_bus_reset(vdev); | |
6eb70187 AW |
471 | |
472 | if (!disable_idle_d3) | |
51ef3a00 | 473 | vfio_pci_set_power_state(vdev, PCI_D3hot); |
89e1f7d4 AW |
474 | } |
475 | ||
cc20d799 AW |
476 | static struct pci_driver vfio_pci_driver; |
477 | ||
478 | static struct vfio_pci_device *get_pf_vdev(struct vfio_pci_device *vdev, | |
479 | struct vfio_device **pf_dev) | |
480 | { | |
481 | struct pci_dev *physfn = pci_physfn(vdev->pdev); | |
482 | ||
483 | if (!vdev->pdev->is_virtfn) | |
484 | return NULL; | |
485 | ||
486 | *pf_dev = vfio_device_get_from_dev(&physfn->dev); | |
487 | if (!*pf_dev) | |
488 | return NULL; | |
489 | ||
490 | if (pci_dev_driver(physfn) != &vfio_pci_driver) { | |
491 | vfio_device_put(*pf_dev); | |
492 | return NULL; | |
493 | } | |
494 | ||
495 | return vfio_device_data(*pf_dev); | |
496 | } | |
497 | ||
498 | static void vfio_pci_vf_token_user_add(struct vfio_pci_device *vdev, int val) | |
499 | { | |
500 | struct vfio_device *pf_dev; | |
501 | struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev, &pf_dev); | |
502 | ||
503 | if (!pf_vdev) | |
504 | return; | |
505 | ||
506 | mutex_lock(&pf_vdev->vf_token->lock); | |
507 | pf_vdev->vf_token->users += val; | |
508 | WARN_ON(pf_vdev->vf_token->users < 0); | |
509 | mutex_unlock(&pf_vdev->vf_token->lock); | |
510 | ||
511 | vfio_device_put(pf_dev); | |
512 | } | |
513 | ||
89e1f7d4 AW |
514 | static void vfio_pci_release(void *device_data) |
515 | { | |
516 | struct vfio_pci_device *vdev = device_data; | |
517 | ||
e309df5b | 518 | mutex_lock(&vdev->reflck->lock); |
61d79256 AW |
519 | |
520 | if (!(--vdev->refcnt)) { | |
cc20d799 | 521 | vfio_pci_vf_token_user_add(vdev, -1); |
1b69be5e | 522 | vfio_spapr_pci_eeh_release(vdev->pdev); |
89e1f7d4 | 523 | vfio_pci_disable(vdev); |
1518ac27 QC |
524 | if (vdev->err_trigger) |
525 | eventfd_ctx_put(vdev->err_trigger); | |
526 | if (vdev->req_trigger) | |
527 | eventfd_ctx_put(vdev->req_trigger); | |
1b69be5e | 528 | } |
89e1f7d4 | 529 | |
e309df5b | 530 | mutex_unlock(&vdev->reflck->lock); |
61d79256 | 531 | |
89e1f7d4 AW |
532 | module_put(THIS_MODULE); |
533 | } | |
534 | ||
535 | static int vfio_pci_open(void *device_data) | |
536 | { | |
537 | struct vfio_pci_device *vdev = device_data; | |
61d79256 | 538 | int ret = 0; |
89e1f7d4 AW |
539 | |
540 | if (!try_module_get(THIS_MODULE)) | |
541 | return -ENODEV; | |
542 | ||
e309df5b | 543 | mutex_lock(&vdev->reflck->lock); |
61d79256 AW |
544 | |
545 | if (!vdev->refcnt) { | |
1b69be5e GS |
546 | ret = vfio_pci_enable(vdev); |
547 | if (ret) | |
548 | goto error; | |
549 | ||
9b936c96 | 550 | vfio_spapr_pci_eeh_open(vdev->pdev); |
cc20d799 | 551 | vfio_pci_vf_token_user_add(vdev, 1); |
89e1f7d4 | 552 | } |
61d79256 | 553 | vdev->refcnt++; |
1b69be5e | 554 | error: |
e309df5b | 555 | mutex_unlock(&vdev->reflck->lock); |
61d79256 AW |
556 | if (ret) |
557 | module_put(THIS_MODULE); | |
1b69be5e | 558 | return ret; |
89e1f7d4 AW |
559 | } |
560 | ||
561 | static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type) | |
562 | { | |
563 | if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) { | |
564 | u8 pin; | |
db04264f AW |
565 | |
566 | if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) || | |
567 | vdev->nointx || vdev->pdev->is_virtfn) | |
568 | return 0; | |
569 | ||
89e1f7d4 | 570 | pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin); |
89e1f7d4 | 571 | |
db04264f | 572 | return pin ? 1 : 0; |
89e1f7d4 AW |
573 | } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) { |
574 | u8 pos; | |
575 | u16 flags; | |
576 | ||
a9047f24 | 577 | pos = vdev->pdev->msi_cap; |
89e1f7d4 AW |
578 | if (pos) { |
579 | pci_read_config_word(vdev->pdev, | |
580 | pos + PCI_MSI_FLAGS, &flags); | |
fd49c81f | 581 | return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1); |
89e1f7d4 AW |
582 | } |
583 | } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) { | |
584 | u8 pos; | |
585 | u16 flags; | |
586 | ||
a9047f24 | 587 | pos = vdev->pdev->msix_cap; |
89e1f7d4 AW |
588 | if (pos) { |
589 | pci_read_config_word(vdev->pdev, | |
590 | pos + PCI_MSIX_FLAGS, &flags); | |
591 | ||
592 | return (flags & PCI_MSIX_FLAGS_QSIZE) + 1; | |
593 | } | |
6140a8f5 | 594 | } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) { |
dad9f897 VMP |
595 | if (pci_is_pcie(vdev->pdev)) |
596 | return 1; | |
6140a8f5 AW |
597 | } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) { |
598 | return 1; | |
599 | } | |
89e1f7d4 AW |
600 | |
601 | return 0; | |
602 | } | |
603 | ||
8b27ee60 AW |
604 | static int vfio_pci_count_devs(struct pci_dev *pdev, void *data) |
605 | { | |
606 | (*(int *)data)++; | |
607 | return 0; | |
608 | } | |
609 | ||
610 | struct vfio_pci_fill_info { | |
611 | int max; | |
612 | int cur; | |
613 | struct vfio_pci_dependent_device *devices; | |
614 | }; | |
615 | ||
616 | static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data) | |
617 | { | |
618 | struct vfio_pci_fill_info *fill = data; | |
619 | struct iommu_group *iommu_group; | |
620 | ||
621 | if (fill->cur == fill->max) | |
622 | return -EAGAIN; /* Something changed, try again */ | |
623 | ||
624 | iommu_group = iommu_group_get(&pdev->dev); | |
625 | if (!iommu_group) | |
626 | return -EPERM; /* Cannot reset non-isolated devices */ | |
627 | ||
628 | fill->devices[fill->cur].group_id = iommu_group_id(iommu_group); | |
629 | fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus); | |
630 | fill->devices[fill->cur].bus = pdev->bus->number; | |
631 | fill->devices[fill->cur].devfn = pdev->devfn; | |
632 | fill->cur++; | |
633 | iommu_group_put(iommu_group); | |
634 | return 0; | |
635 | } | |
636 | ||
637 | struct vfio_pci_group_entry { | |
638 | struct vfio_group *group; | |
639 | int id; | |
640 | }; | |
641 | ||
642 | struct vfio_pci_group_info { | |
643 | int count; | |
644 | struct vfio_pci_group_entry *groups; | |
645 | }; | |
646 | ||
647 | static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data) | |
648 | { | |
649 | struct vfio_pci_group_info *info = data; | |
650 | struct iommu_group *group; | |
651 | int id, i; | |
652 | ||
653 | group = iommu_group_get(&pdev->dev); | |
654 | if (!group) | |
655 | return -EPERM; | |
656 | ||
657 | id = iommu_group_id(group); | |
658 | ||
659 | for (i = 0; i < info->count; i++) | |
660 | if (info->groups[i].id == id) | |
661 | break; | |
662 | ||
663 | iommu_group_put(group); | |
664 | ||
665 | return (i == info->count) ? -EINVAL : 0; | |
666 | } | |
667 | ||
668 | static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot) | |
669 | { | |
670 | for (; pdev; pdev = pdev->bus->self) | |
671 | if (pdev->bus == slot->bus) | |
672 | return (pdev->slot == slot); | |
673 | return false; | |
674 | } | |
675 | ||
676 | struct vfio_pci_walk_info { | |
677 | int (*fn)(struct pci_dev *, void *data); | |
678 | void *data; | |
679 | struct pci_dev *pdev; | |
680 | bool slot; | |
681 | int ret; | |
682 | }; | |
683 | ||
684 | static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data) | |
685 | { | |
686 | struct vfio_pci_walk_info *walk = data; | |
687 | ||
688 | if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot)) | |
689 | walk->ret = walk->fn(pdev, walk->data); | |
690 | ||
691 | return walk->ret; | |
692 | } | |
693 | ||
694 | static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev, | |
695 | int (*fn)(struct pci_dev *, | |
696 | void *data), void *data, | |
697 | bool slot) | |
698 | { | |
699 | struct vfio_pci_walk_info walk = { | |
700 | .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0, | |
701 | }; | |
702 | ||
703 | pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk); | |
704 | ||
705 | return walk.ret; | |
706 | } | |
707 | ||
a32295c6 AK |
708 | static int msix_mmappable_cap(struct vfio_pci_device *vdev, |
709 | struct vfio_info_cap *caps) | |
188ad9d6 | 710 | { |
a32295c6 AK |
711 | struct vfio_info_cap_header header = { |
712 | .id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE, | |
713 | .version = 1 | |
714 | }; | |
28541d41 | 715 | |
a32295c6 | 716 | return vfio_info_add_capability(caps, &header, sizeof(header)); |
28541d41 AW |
717 | } |
718 | ||
719 | int vfio_pci_register_dev_region(struct vfio_pci_device *vdev, | |
720 | unsigned int type, unsigned int subtype, | |
721 | const struct vfio_pci_regops *ops, | |
722 | size_t size, u32 flags, void *data) | |
723 | { | |
724 | struct vfio_pci_region *region; | |
725 | ||
726 | region = krealloc(vdev->region, | |
727 | (vdev->num_regions + 1) * sizeof(*region), | |
728 | GFP_KERNEL); | |
729 | if (!region) | |
730 | return -ENOMEM; | |
731 | ||
732 | vdev->region = region; | |
733 | vdev->region[vdev->num_regions].type = type; | |
734 | vdev->region[vdev->num_regions].subtype = subtype; | |
735 | vdev->region[vdev->num_regions].ops = ops; | |
736 | vdev->region[vdev->num_regions].size = size; | |
737 | vdev->region[vdev->num_regions].flags = flags; | |
738 | vdev->region[vdev->num_regions].data = data; | |
739 | ||
740 | vdev->num_regions++; | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
abafbc55 AW |
745 | struct vfio_devices { |
746 | struct vfio_device **devices; | |
747 | int cur_index; | |
748 | int max_index; | |
749 | }; | |
750 | ||
89e1f7d4 AW |
751 | static long vfio_pci_ioctl(void *device_data, |
752 | unsigned int cmd, unsigned long arg) | |
753 | { | |
754 | struct vfio_pci_device *vdev = device_data; | |
755 | unsigned long minsz; | |
756 | ||
757 | if (cmd == VFIO_DEVICE_GET_INFO) { | |
758 | struct vfio_device_info info; | |
759 | ||
760 | minsz = offsetofend(struct vfio_device_info, num_irqs); | |
761 | ||
762 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
763 | return -EFAULT; | |
764 | ||
765 | if (info.argsz < minsz) | |
766 | return -EINVAL; | |
767 | ||
768 | info.flags = VFIO_DEVICE_FLAGS_PCI; | |
769 | ||
770 | if (vdev->reset_works) | |
771 | info.flags |= VFIO_DEVICE_FLAGS_RESET; | |
772 | ||
28541d41 | 773 | info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions; |
89e1f7d4 AW |
774 | info.num_irqs = VFIO_PCI_NUM_IRQS; |
775 | ||
8160c4e4 MT |
776 | return copy_to_user((void __user *)arg, &info, minsz) ? |
777 | -EFAULT : 0; | |
89e1f7d4 AW |
778 | |
779 | } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { | |
780 | struct pci_dev *pdev = vdev->pdev; | |
781 | struct vfio_region_info info; | |
188ad9d6 | 782 | struct vfio_info_cap caps = { .buf = NULL, .size = 0 }; |
28541d41 | 783 | int i, ret; |
89e1f7d4 AW |
784 | |
785 | minsz = offsetofend(struct vfio_region_info, offset); | |
786 | ||
787 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
788 | return -EFAULT; | |
789 | ||
790 | if (info.argsz < minsz) | |
791 | return -EINVAL; | |
792 | ||
793 | switch (info.index) { | |
794 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
795 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
796 | info.size = pdev->cfg_size; | |
797 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
798 | VFIO_REGION_INFO_FLAG_WRITE; | |
799 | break; | |
800 | case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: | |
801 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
802 | info.size = pci_resource_len(pdev, info.index); | |
803 | if (!info.size) { | |
804 | info.flags = 0; | |
805 | break; | |
806 | } | |
807 | ||
808 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
809 | VFIO_REGION_INFO_FLAG_WRITE; | |
05f0c03f | 810 | if (vdev->bar_mmap_supported[info.index]) { |
89e1f7d4 | 811 | info.flags |= VFIO_REGION_INFO_FLAG_MMAP; |
188ad9d6 | 812 | if (info.index == vdev->msix_bar) { |
a32295c6 | 813 | ret = msix_mmappable_cap(vdev, &caps); |
188ad9d6 AW |
814 | if (ret) |
815 | return ret; | |
816 | } | |
817 | } | |
818 | ||
89e1f7d4 AW |
819 | break; |
820 | case VFIO_PCI_ROM_REGION_INDEX: | |
821 | { | |
822 | void __iomem *io; | |
823 | size_t size; | |
abafbc55 | 824 | u16 cmd; |
89e1f7d4 AW |
825 | |
826 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
827 | info.flags = 0; | |
828 | ||
829 | /* Report the BAR size, not the ROM size */ | |
830 | info.size = pci_resource_len(pdev, info.index); | |
a13b6459 AW |
831 | if (!info.size) { |
832 | /* Shadow ROMs appear as PCI option ROMs */ | |
833 | if (pdev->resource[PCI_ROM_RESOURCE].flags & | |
834 | IORESOURCE_ROM_SHADOW) | |
835 | info.size = 0x20000; | |
836 | else | |
837 | break; | |
838 | } | |
89e1f7d4 | 839 | |
0cfd027b EA |
840 | /* |
841 | * Is it really there? Enable memory decode for | |
842 | * implicit access in pci_map_rom(). | |
843 | */ | |
abafbc55 | 844 | cmd = vfio_pci_memory_lock_and_enable(vdev); |
89e1f7d4 | 845 | io = pci_map_rom(pdev, &size); |
0cfd027b EA |
846 | if (io) { |
847 | info.flags = VFIO_REGION_INFO_FLAG_READ; | |
848 | pci_unmap_rom(pdev, io); | |
849 | } else { | |
89e1f7d4 | 850 | info.size = 0; |
89e1f7d4 | 851 | } |
abafbc55 | 852 | vfio_pci_memory_unlock_and_restore(vdev, cmd); |
89e1f7d4 | 853 | |
89e1f7d4 AW |
854 | break; |
855 | } | |
84237a82 AW |
856 | case VFIO_PCI_VGA_REGION_INDEX: |
857 | if (!vdev->has_vga) | |
858 | return -EINVAL; | |
859 | ||
860 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
861 | info.size = 0xc0000; | |
862 | info.flags = VFIO_REGION_INFO_FLAG_READ | | |
863 | VFIO_REGION_INFO_FLAG_WRITE; | |
864 | ||
865 | break; | |
89e1f7d4 | 866 | default: |
c535d345 | 867 | { |
dda01f78 AW |
868 | struct vfio_region_info_cap_type cap_type = { |
869 | .header.id = VFIO_REGION_INFO_CAP_TYPE, | |
870 | .header.version = 1 }; | |
c535d345 | 871 | |
28541d41 AW |
872 | if (info.index >= |
873 | VFIO_PCI_NUM_REGIONS + vdev->num_regions) | |
874 | return -EINVAL; | |
0e714d27 GS |
875 | info.index = array_index_nospec(info.index, |
876 | VFIO_PCI_NUM_REGIONS + | |
877 | vdev->num_regions); | |
28541d41 AW |
878 | |
879 | i = info.index - VFIO_PCI_NUM_REGIONS; | |
880 | ||
881 | info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); | |
882 | info.size = vdev->region[i].size; | |
883 | info.flags = vdev->region[i].flags; | |
884 | ||
c535d345 KW |
885 | cap_type.type = vdev->region[i].type; |
886 | cap_type.subtype = vdev->region[i].subtype; | |
887 | ||
dda01f78 AW |
888 | ret = vfio_info_add_capability(&caps, &cap_type.header, |
889 | sizeof(cap_type)); | |
28541d41 AW |
890 | if (ret) |
891 | return ret; | |
c535d345 | 892 | |
c2c0f1cd AK |
893 | if (vdev->region[i].ops->add_capability) { |
894 | ret = vdev->region[i].ops->add_capability(vdev, | |
895 | &vdev->region[i], &caps); | |
896 | if (ret) | |
897 | return ret; | |
898 | } | |
c535d345 | 899 | } |
89e1f7d4 AW |
900 | } |
901 | ||
188ad9d6 AW |
902 | if (caps.size) { |
903 | info.flags |= VFIO_REGION_INFO_FLAG_CAPS; | |
904 | if (info.argsz < sizeof(info) + caps.size) { | |
905 | info.argsz = sizeof(info) + caps.size; | |
906 | info.cap_offset = 0; | |
907 | } else { | |
908 | vfio_info_cap_shift(&caps, sizeof(info)); | |
c4aec310 DC |
909 | if (copy_to_user((void __user *)arg + |
910 | sizeof(info), caps.buf, | |
911 | caps.size)) { | |
188ad9d6 | 912 | kfree(caps.buf); |
c4aec310 | 913 | return -EFAULT; |
188ad9d6 AW |
914 | } |
915 | info.cap_offset = sizeof(info); | |
916 | } | |
917 | ||
918 | kfree(caps.buf); | |
89e1f7d4 AW |
919 | } |
920 | ||
8160c4e4 MT |
921 | return copy_to_user((void __user *)arg, &info, minsz) ? |
922 | -EFAULT : 0; | |
89e1f7d4 AW |
923 | |
924 | } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { | |
925 | struct vfio_irq_info info; | |
926 | ||
927 | minsz = offsetofend(struct vfio_irq_info, count); | |
928 | ||
929 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
930 | return -EFAULT; | |
931 | ||
932 | if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) | |
933 | return -EINVAL; | |
934 | ||
dad9f897 VMP |
935 | switch (info.index) { |
936 | case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: | |
6140a8f5 | 937 | case VFIO_PCI_REQ_IRQ_INDEX: |
dad9f897 VMP |
938 | break; |
939 | case VFIO_PCI_ERR_IRQ_INDEX: | |
940 | if (pci_is_pcie(vdev->pdev)) | |
941 | break; | |
544c05a6 | 942 | /* fall through */ |
dad9f897 VMP |
943 | default: |
944 | return -EINVAL; | |
945 | } | |
946 | ||
89e1f7d4 AW |
947 | info.flags = VFIO_IRQ_INFO_EVENTFD; |
948 | ||
949 | info.count = vfio_pci_get_irq_count(vdev, info.index); | |
950 | ||
951 | if (info.index == VFIO_PCI_INTX_IRQ_INDEX) | |
952 | info.flags |= (VFIO_IRQ_INFO_MASKABLE | | |
953 | VFIO_IRQ_INFO_AUTOMASKED); | |
954 | else | |
955 | info.flags |= VFIO_IRQ_INFO_NORESIZE; | |
956 | ||
8160c4e4 MT |
957 | return copy_to_user((void __user *)arg, &info, minsz) ? |
958 | -EFAULT : 0; | |
89e1f7d4 AW |
959 | |
960 | } else if (cmd == VFIO_DEVICE_SET_IRQS) { | |
961 | struct vfio_irq_set hdr; | |
962 | u8 *data = NULL; | |
05692d70 | 963 | int max, ret = 0; |
ef198aaa | 964 | size_t data_size = 0; |
89e1f7d4 AW |
965 | |
966 | minsz = offsetofend(struct vfio_irq_set, count); | |
967 | ||
968 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
969 | return -EFAULT; | |
970 | ||
05692d70 | 971 | max = vfio_pci_get_irq_count(vdev, hdr.index); |
89e1f7d4 | 972 | |
ef198aaa KW |
973 | ret = vfio_set_irqs_validate_and_prepare(&hdr, max, |
974 | VFIO_PCI_NUM_IRQS, &data_size); | |
975 | if (ret) | |
976 | return ret; | |
89e1f7d4 | 977 | |
ef198aaa | 978 | if (data_size) { |
3a1f7041 | 979 | data = memdup_user((void __user *)(arg + minsz), |
ef198aaa | 980 | data_size); |
3a1f7041 FW |
981 | if (IS_ERR(data)) |
982 | return PTR_ERR(data); | |
89e1f7d4 AW |
983 | } |
984 | ||
985 | mutex_lock(&vdev->igate); | |
986 | ||
987 | ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index, | |
988 | hdr.start, hdr.count, data); | |
989 | ||
990 | mutex_unlock(&vdev->igate); | |
991 | kfree(data); | |
992 | ||
993 | return ret; | |
994 | ||
8b27ee60 | 995 | } else if (cmd == VFIO_DEVICE_RESET) { |
abafbc55 AW |
996 | int ret; |
997 | ||
998 | if (!vdev->reset_works) | |
999 | return -EINVAL; | |
1000 | ||
1001 | vfio_pci_zap_and_down_write_memory_lock(vdev); | |
1002 | ret = pci_try_reset_function(vdev->pdev); | |
1003 | up_write(&vdev->memory_lock); | |
1004 | ||
1005 | return ret; | |
89e1f7d4 | 1006 | |
8b27ee60 AW |
1007 | } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) { |
1008 | struct vfio_pci_hot_reset_info hdr; | |
1009 | struct vfio_pci_fill_info fill = { 0 }; | |
1010 | struct vfio_pci_dependent_device *devices = NULL; | |
1011 | bool slot = false; | |
1012 | int ret = 0; | |
1013 | ||
1014 | minsz = offsetofend(struct vfio_pci_hot_reset_info, count); | |
1015 | ||
1016 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
1017 | return -EFAULT; | |
1018 | ||
1019 | if (hdr.argsz < minsz) | |
1020 | return -EINVAL; | |
1021 | ||
1022 | hdr.flags = 0; | |
1023 | ||
1024 | /* Can we do a slot or bus reset or neither? */ | |
1025 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
1026 | slot = true; | |
1027 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
1028 | return -ENODEV; | |
1029 | ||
1030 | /* How many devices are affected? */ | |
1031 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
1032 | vfio_pci_count_devs, | |
1033 | &fill.max, slot); | |
1034 | if (ret) | |
1035 | return ret; | |
1036 | ||
1037 | WARN_ON(!fill.max); /* Should always be at least one */ | |
1038 | ||
1039 | /* | |
1040 | * If there's enough space, fill it now, otherwise return | |
1041 | * -ENOSPC and the number of devices affected. | |
1042 | */ | |
1043 | if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) { | |
1044 | ret = -ENOSPC; | |
1045 | hdr.count = fill.max; | |
1046 | goto reset_info_exit; | |
1047 | } | |
1048 | ||
1049 | devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL); | |
1050 | if (!devices) | |
1051 | return -ENOMEM; | |
1052 | ||
1053 | fill.devices = devices; | |
1054 | ||
1055 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
1056 | vfio_pci_fill_devs, | |
1057 | &fill, slot); | |
1058 | ||
1059 | /* | |
1060 | * If a device was removed between counting and filling, | |
1061 | * we may come up short of fill.max. If a device was | |
1062 | * added, we'll have a return of -EAGAIN above. | |
1063 | */ | |
1064 | if (!ret) | |
1065 | hdr.count = fill.cur; | |
1066 | ||
1067 | reset_info_exit: | |
1068 | if (copy_to_user((void __user *)arg, &hdr, minsz)) | |
1069 | ret = -EFAULT; | |
1070 | ||
1071 | if (!ret) { | |
1072 | if (copy_to_user((void __user *)(arg + minsz), devices, | |
1073 | hdr.count * sizeof(*devices))) | |
1074 | ret = -EFAULT; | |
1075 | } | |
1076 | ||
1077 | kfree(devices); | |
1078 | return ret; | |
1079 | ||
1080 | } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) { | |
1081 | struct vfio_pci_hot_reset hdr; | |
1082 | int32_t *group_fds; | |
1083 | struct vfio_pci_group_entry *groups; | |
1084 | struct vfio_pci_group_info info; | |
abafbc55 | 1085 | struct vfio_devices devs = { .cur_index = 0 }; |
8b27ee60 | 1086 | bool slot = false; |
abafbc55 | 1087 | int i, group_idx, mem_idx = 0, count = 0, ret = 0; |
8b27ee60 AW |
1088 | |
1089 | minsz = offsetofend(struct vfio_pci_hot_reset, count); | |
1090 | ||
1091 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
1092 | return -EFAULT; | |
1093 | ||
1094 | if (hdr.argsz < minsz || hdr.flags) | |
1095 | return -EINVAL; | |
1096 | ||
1097 | /* Can we do a slot or bus reset or neither? */ | |
1098 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
1099 | slot = true; | |
1100 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
1101 | return -ENODEV; | |
1102 | ||
1103 | /* | |
1104 | * We can't let userspace give us an arbitrarily large | |
1105 | * buffer to copy, so verify how many we think there | |
1106 | * could be. Note groups can have multiple devices so | |
1107 | * one group per device is the max. | |
1108 | */ | |
1109 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
1110 | vfio_pci_count_devs, | |
1111 | &count, slot); | |
1112 | if (ret) | |
1113 | return ret; | |
1114 | ||
1115 | /* Somewhere between 1 and count is OK */ | |
1116 | if (!hdr.count || hdr.count > count) | |
1117 | return -EINVAL; | |
1118 | ||
1119 | group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL); | |
1120 | groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL); | |
1121 | if (!group_fds || !groups) { | |
1122 | kfree(group_fds); | |
1123 | kfree(groups); | |
1124 | return -ENOMEM; | |
1125 | } | |
1126 | ||
1127 | if (copy_from_user(group_fds, (void __user *)(arg + minsz), | |
1128 | hdr.count * sizeof(*group_fds))) { | |
1129 | kfree(group_fds); | |
1130 | kfree(groups); | |
1131 | return -EFAULT; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * For each group_fd, get the group through the vfio external | |
1136 | * user interface and store the group and iommu ID. This | |
1137 | * ensures the group is held across the reset. | |
1138 | */ | |
abafbc55 | 1139 | for (group_idx = 0; group_idx < hdr.count; group_idx++) { |
8b27ee60 | 1140 | struct vfio_group *group; |
abafbc55 | 1141 | struct fd f = fdget(group_fds[group_idx]); |
8b27ee60 AW |
1142 | if (!f.file) { |
1143 | ret = -EBADF; | |
1144 | break; | |
1145 | } | |
1146 | ||
1147 | group = vfio_group_get_external_user(f.file); | |
1148 | fdput(f); | |
1149 | if (IS_ERR(group)) { | |
1150 | ret = PTR_ERR(group); | |
1151 | break; | |
1152 | } | |
1153 | ||
abafbc55 AW |
1154 | groups[group_idx].group = group; |
1155 | groups[group_idx].id = | |
1156 | vfio_external_user_iommu_id(group); | |
8b27ee60 AW |
1157 | } |
1158 | ||
1159 | kfree(group_fds); | |
1160 | ||
1161 | /* release reference to groups on error */ | |
1162 | if (ret) | |
1163 | goto hot_reset_release; | |
1164 | ||
1165 | info.count = hdr.count; | |
1166 | info.groups = groups; | |
1167 | ||
1168 | /* | |
1169 | * Test whether all the affected devices are contained | |
1170 | * by the set of groups provided by the user. | |
1171 | */ | |
1172 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
1173 | vfio_pci_validate_devs, | |
1174 | &info, slot); | |
abafbc55 AW |
1175 | if (ret) |
1176 | goto hot_reset_release; | |
1177 | ||
1178 | devs.max_index = count; | |
1179 | devs.devices = kcalloc(count, sizeof(struct vfio_device *), | |
1180 | GFP_KERNEL); | |
1181 | if (!devs.devices) { | |
1182 | ret = -ENOMEM; | |
1183 | goto hot_reset_release; | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * We need to get memory_lock for each device, but devices | |
c1e8d7c6 | 1188 | * can share mmap_lock, therefore we need to zap and hold |
abafbc55 AW |
1189 | * the vma_lock for each device, and only then get each |
1190 | * memory_lock. | |
1191 | */ | |
1192 | ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, | |
1193 | vfio_pci_try_zap_and_vma_lock_cb, | |
1194 | &devs, slot); | |
1195 | if (ret) | |
1196 | goto hot_reset_release; | |
1197 | ||
1198 | for (; mem_idx < devs.cur_index; mem_idx++) { | |
1199 | struct vfio_pci_device *tmp; | |
1200 | ||
1201 | tmp = vfio_device_data(devs.devices[mem_idx]); | |
1202 | ||
1203 | ret = down_write_trylock(&tmp->memory_lock); | |
1204 | if (!ret) { | |
1205 | ret = -EBUSY; | |
1206 | goto hot_reset_release; | |
1207 | } | |
1208 | mutex_unlock(&tmp->vma_lock); | |
1209 | } | |
1210 | ||
1211 | /* User has access, do the reset */ | |
1212 | ret = pci_reset_bus(vdev->pdev); | |
8b27ee60 AW |
1213 | |
1214 | hot_reset_release: | |
abafbc55 AW |
1215 | for (i = 0; i < devs.cur_index; i++) { |
1216 | struct vfio_device *device; | |
1217 | struct vfio_pci_device *tmp; | |
1218 | ||
1219 | device = devs.devices[i]; | |
1220 | tmp = vfio_device_data(device); | |
1221 | ||
1222 | if (i < mem_idx) | |
1223 | up_write(&tmp->memory_lock); | |
1224 | else | |
1225 | mutex_unlock(&tmp->vma_lock); | |
1226 | vfio_device_put(device); | |
1227 | } | |
1228 | kfree(devs.devices); | |
1229 | ||
1230 | for (group_idx--; group_idx >= 0; group_idx--) | |
1231 | vfio_group_put_external_user(groups[group_idx].group); | |
8b27ee60 AW |
1232 | |
1233 | kfree(groups); | |
1234 | return ret; | |
30656177 AW |
1235 | } else if (cmd == VFIO_DEVICE_IOEVENTFD) { |
1236 | struct vfio_device_ioeventfd ioeventfd; | |
1237 | int count; | |
1238 | ||
1239 | minsz = offsetofend(struct vfio_device_ioeventfd, fd); | |
1240 | ||
1241 | if (copy_from_user(&ioeventfd, (void __user *)arg, minsz)) | |
1242 | return -EFAULT; | |
1243 | ||
1244 | if (ioeventfd.argsz < minsz) | |
1245 | return -EINVAL; | |
1246 | ||
1247 | if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK) | |
1248 | return -EINVAL; | |
1249 | ||
1250 | count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK; | |
1251 | ||
1252 | if (hweight8(count) != 1 || ioeventfd.fd < -1) | |
1253 | return -EINVAL; | |
1254 | ||
1255 | return vfio_pci_ioeventfd(vdev, ioeventfd.offset, | |
1256 | ioeventfd.data, count, ioeventfd.fd); | |
43eeeecc AW |
1257 | } else if (cmd == VFIO_DEVICE_FEATURE) { |
1258 | struct vfio_device_feature feature; | |
1259 | uuid_t uuid; | |
1260 | ||
1261 | minsz = offsetofend(struct vfio_device_feature, flags); | |
1262 | ||
1263 | if (copy_from_user(&feature, (void __user *)arg, minsz)) | |
1264 | return -EFAULT; | |
1265 | ||
1266 | if (feature.argsz < minsz) | |
1267 | return -EINVAL; | |
1268 | ||
1269 | /* Check unknown flags */ | |
1270 | if (feature.flags & ~(VFIO_DEVICE_FEATURE_MASK | | |
1271 | VFIO_DEVICE_FEATURE_SET | | |
1272 | VFIO_DEVICE_FEATURE_GET | | |
1273 | VFIO_DEVICE_FEATURE_PROBE)) | |
1274 | return -EINVAL; | |
1275 | ||
1276 | /* GET & SET are mutually exclusive except with PROBE */ | |
1277 | if (!(feature.flags & VFIO_DEVICE_FEATURE_PROBE) && | |
1278 | (feature.flags & VFIO_DEVICE_FEATURE_SET) && | |
1279 | (feature.flags & VFIO_DEVICE_FEATURE_GET)) | |
1280 | return -EINVAL; | |
1281 | ||
1282 | switch (feature.flags & VFIO_DEVICE_FEATURE_MASK) { | |
1283 | case VFIO_DEVICE_FEATURE_PCI_VF_TOKEN: | |
1284 | if (!vdev->vf_token) | |
1285 | return -ENOTTY; | |
1286 | ||
1287 | /* | |
1288 | * We do not support GET of the VF Token UUID as this | |
1289 | * could expose the token of the previous device user. | |
1290 | */ | |
1291 | if (feature.flags & VFIO_DEVICE_FEATURE_GET) | |
1292 | return -EINVAL; | |
1293 | ||
1294 | if (feature.flags & VFIO_DEVICE_FEATURE_PROBE) | |
1295 | return 0; | |
1296 | ||
1297 | /* Don't SET unless told to do so */ | |
1298 | if (!(feature.flags & VFIO_DEVICE_FEATURE_SET)) | |
1299 | return -EINVAL; | |
1300 | ||
1301 | if (feature.argsz < minsz + sizeof(uuid)) | |
1302 | return -EINVAL; | |
1303 | ||
1304 | if (copy_from_user(&uuid, (void __user *)(arg + minsz), | |
1305 | sizeof(uuid))) | |
1306 | return -EFAULT; | |
1307 | ||
1308 | mutex_lock(&vdev->vf_token->lock); | |
1309 | uuid_copy(&vdev->vf_token->uuid, &uuid); | |
1310 | mutex_unlock(&vdev->vf_token->lock); | |
1311 | ||
1312 | return 0; | |
1313 | default: | |
1314 | return -ENOTTY; | |
1315 | } | |
8b27ee60 AW |
1316 | } |
1317 | ||
89e1f7d4 AW |
1318 | return -ENOTTY; |
1319 | } | |
1320 | ||
5b279a11 AW |
1321 | static ssize_t vfio_pci_rw(void *device_data, char __user *buf, |
1322 | size_t count, loff_t *ppos, bool iswrite) | |
89e1f7d4 AW |
1323 | { |
1324 | unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); | |
1325 | struct vfio_pci_device *vdev = device_data; | |
89e1f7d4 | 1326 | |
28541d41 | 1327 | if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions) |
89e1f7d4 AW |
1328 | return -EINVAL; |
1329 | ||
5b279a11 AW |
1330 | switch (index) { |
1331 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
906ee99d AW |
1332 | return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite); |
1333 | ||
5b279a11 AW |
1334 | case VFIO_PCI_ROM_REGION_INDEX: |
1335 | if (iswrite) | |
1336 | return -EINVAL; | |
906ee99d | 1337 | return vfio_pci_bar_rw(vdev, buf, count, ppos, false); |
89e1f7d4 | 1338 | |
5b279a11 | 1339 | case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: |
906ee99d | 1340 | return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); |
84237a82 AW |
1341 | |
1342 | case VFIO_PCI_VGA_REGION_INDEX: | |
1343 | return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); | |
28541d41 AW |
1344 | default: |
1345 | index -= VFIO_PCI_NUM_REGIONS; | |
1346 | return vdev->region[index].ops->rw(vdev, buf, | |
1347 | count, ppos, iswrite); | |
5b279a11 AW |
1348 | } |
1349 | ||
89e1f7d4 AW |
1350 | return -EINVAL; |
1351 | } | |
1352 | ||
5b279a11 AW |
1353 | static ssize_t vfio_pci_read(void *device_data, char __user *buf, |
1354 | size_t count, loff_t *ppos) | |
1355 | { | |
906ee99d AW |
1356 | if (!count) |
1357 | return 0; | |
1358 | ||
5b279a11 AW |
1359 | return vfio_pci_rw(device_data, buf, count, ppos, false); |
1360 | } | |
1361 | ||
89e1f7d4 AW |
1362 | static ssize_t vfio_pci_write(void *device_data, const char __user *buf, |
1363 | size_t count, loff_t *ppos) | |
1364 | { | |
906ee99d AW |
1365 | if (!count) |
1366 | return 0; | |
1367 | ||
1368 | return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true); | |
89e1f7d4 AW |
1369 | } |
1370 | ||
abafbc55 AW |
1371 | /* Return 1 on zap and vma_lock acquired, 0 on contention (only with @try) */ |
1372 | static int vfio_pci_zap_and_vma_lock(struct vfio_pci_device *vdev, bool try) | |
1373 | { | |
1374 | struct vfio_pci_mmap_vma *mmap_vma, *tmp; | |
1375 | ||
1376 | /* | |
1377 | * Lock ordering: | |
c1e8d7c6 | 1378 | * vma_lock is nested under mmap_lock for vm_ops callback paths. |
abafbc55 AW |
1379 | * The memory_lock semaphore is used by both code paths calling |
1380 | * into this function to zap vmas and the vm_ops.fault callback | |
1381 | * to protect the memory enable state of the device. | |
1382 | * | |
c1e8d7c6 | 1383 | * When zapping vmas we need to maintain the mmap_lock => vma_lock |
abafbc55 | 1384 | * ordering, which requires using vma_lock to walk vma_list to |
c1e8d7c6 | 1385 | * acquire an mm, then dropping vma_lock to get the mmap_lock and |
abafbc55 AW |
1386 | * reacquiring vma_lock. This logic is derived from similar |
1387 | * requirements in uverbs_user_mmap_disassociate(). | |
1388 | * | |
c1e8d7c6 | 1389 | * mmap_lock must always be the top-level lock when it is taken. |
abafbc55 | 1390 | * Therefore we can only hold the memory_lock write lock when |
c1e8d7c6 | 1391 | * vma_list is empty, as we'd need to take mmap_lock to clear |
abafbc55 AW |
1392 | * entries. vma_list can only be guaranteed empty when holding |
1393 | * vma_lock, thus memory_lock is nested under vma_lock. | |
1394 | * | |
1395 | * This enables the vm_ops.fault callback to acquire vma_lock, | |
1396 | * followed by memory_lock read lock, while already holding | |
c1e8d7c6 | 1397 | * mmap_lock without risk of deadlock. |
abafbc55 AW |
1398 | */ |
1399 | while (1) { | |
1400 | struct mm_struct *mm = NULL; | |
1401 | ||
1402 | if (try) { | |
1403 | if (!mutex_trylock(&vdev->vma_lock)) | |
1404 | return 0; | |
1405 | } else { | |
1406 | mutex_lock(&vdev->vma_lock); | |
1407 | } | |
1408 | while (!list_empty(&vdev->vma_list)) { | |
1409 | mmap_vma = list_first_entry(&vdev->vma_list, | |
1410 | struct vfio_pci_mmap_vma, | |
1411 | vma_next); | |
1412 | mm = mmap_vma->vma->vm_mm; | |
1413 | if (mmget_not_zero(mm)) | |
1414 | break; | |
1415 | ||
1416 | list_del(&mmap_vma->vma_next); | |
1417 | kfree(mmap_vma); | |
1418 | mm = NULL; | |
1419 | } | |
1420 | if (!mm) | |
1421 | return 1; | |
1422 | mutex_unlock(&vdev->vma_lock); | |
1423 | ||
1424 | if (try) { | |
89154dd5 | 1425 | if (!mmap_read_trylock(mm)) { |
abafbc55 AW |
1426 | mmput(mm); |
1427 | return 0; | |
1428 | } | |
1429 | } else { | |
89154dd5 | 1430 | mmap_read_lock(mm); |
abafbc55 AW |
1431 | } |
1432 | if (mmget_still_valid(mm)) { | |
1433 | if (try) { | |
1434 | if (!mutex_trylock(&vdev->vma_lock)) { | |
89154dd5 | 1435 | mmap_read_unlock(mm); |
abafbc55 AW |
1436 | mmput(mm); |
1437 | return 0; | |
1438 | } | |
1439 | } else { | |
1440 | mutex_lock(&vdev->vma_lock); | |
1441 | } | |
1442 | list_for_each_entry_safe(mmap_vma, tmp, | |
1443 | &vdev->vma_list, vma_next) { | |
1444 | struct vm_area_struct *vma = mmap_vma->vma; | |
1445 | ||
1446 | if (vma->vm_mm != mm) | |
1447 | continue; | |
1448 | ||
1449 | list_del(&mmap_vma->vma_next); | |
1450 | kfree(mmap_vma); | |
1451 | ||
1452 | zap_vma_ptes(vma, vma->vm_start, | |
1453 | vma->vm_end - vma->vm_start); | |
1454 | } | |
1455 | mutex_unlock(&vdev->vma_lock); | |
1456 | } | |
89154dd5 | 1457 | mmap_read_unlock(mm); |
abafbc55 AW |
1458 | mmput(mm); |
1459 | } | |
1460 | } | |
1461 | ||
1462 | void vfio_pci_zap_and_down_write_memory_lock(struct vfio_pci_device *vdev) | |
1463 | { | |
1464 | vfio_pci_zap_and_vma_lock(vdev, false); | |
1465 | down_write(&vdev->memory_lock); | |
1466 | mutex_unlock(&vdev->vma_lock); | |
1467 | } | |
1468 | ||
1469 | u16 vfio_pci_memory_lock_and_enable(struct vfio_pci_device *vdev) | |
1470 | { | |
1471 | u16 cmd; | |
1472 | ||
1473 | down_write(&vdev->memory_lock); | |
1474 | pci_read_config_word(vdev->pdev, PCI_COMMAND, &cmd); | |
1475 | if (!(cmd & PCI_COMMAND_MEMORY)) | |
1476 | pci_write_config_word(vdev->pdev, PCI_COMMAND, | |
1477 | cmd | PCI_COMMAND_MEMORY); | |
1478 | ||
1479 | return cmd; | |
1480 | } | |
1481 | ||
1482 | void vfio_pci_memory_unlock_and_restore(struct vfio_pci_device *vdev, u16 cmd) | |
1483 | { | |
1484 | pci_write_config_word(vdev->pdev, PCI_COMMAND, cmd); | |
1485 | up_write(&vdev->memory_lock); | |
1486 | } | |
1487 | ||
1488 | /* Caller holds vma_lock */ | |
1489 | static int __vfio_pci_add_vma(struct vfio_pci_device *vdev, | |
1490 | struct vm_area_struct *vma) | |
11c4cd07 AW |
1491 | { |
1492 | struct vfio_pci_mmap_vma *mmap_vma; | |
1493 | ||
1494 | mmap_vma = kmalloc(sizeof(*mmap_vma), GFP_KERNEL); | |
1495 | if (!mmap_vma) | |
1496 | return -ENOMEM; | |
1497 | ||
1498 | mmap_vma->vma = vma; | |
11c4cd07 | 1499 | list_add(&mmap_vma->vma_next, &vdev->vma_list); |
11c4cd07 AW |
1500 | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | /* | |
1505 | * Zap mmaps on open so that we can fault them in on access and therefore | |
1506 | * our vma_list only tracks mappings accessed since last zap. | |
1507 | */ | |
1508 | static void vfio_pci_mmap_open(struct vm_area_struct *vma) | |
1509 | { | |
1510 | zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start); | |
1511 | } | |
1512 | ||
1513 | static void vfio_pci_mmap_close(struct vm_area_struct *vma) | |
1514 | { | |
1515 | struct vfio_pci_device *vdev = vma->vm_private_data; | |
1516 | struct vfio_pci_mmap_vma *mmap_vma; | |
1517 | ||
1518 | mutex_lock(&vdev->vma_lock); | |
1519 | list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) { | |
1520 | if (mmap_vma->vma == vma) { | |
1521 | list_del(&mmap_vma->vma_next); | |
1522 | kfree(mmap_vma); | |
1523 | break; | |
1524 | } | |
1525 | } | |
1526 | mutex_unlock(&vdev->vma_lock); | |
1527 | } | |
1528 | ||
1529 | static vm_fault_t vfio_pci_mmap_fault(struct vm_fault *vmf) | |
1530 | { | |
1531 | struct vm_area_struct *vma = vmf->vma; | |
1532 | struct vfio_pci_device *vdev = vma->vm_private_data; | |
abafbc55 AW |
1533 | vm_fault_t ret = VM_FAULT_NOPAGE; |
1534 | ||
1535 | mutex_lock(&vdev->vma_lock); | |
1536 | down_read(&vdev->memory_lock); | |
1537 | ||
1538 | if (!__vfio_pci_memory_enabled(vdev)) { | |
1539 | ret = VM_FAULT_SIGBUS; | |
1540 | mutex_unlock(&vdev->vma_lock); | |
1541 | goto up_out; | |
1542 | } | |
11c4cd07 | 1543 | |
abafbc55 AW |
1544 | if (__vfio_pci_add_vma(vdev, vma)) { |
1545 | ret = VM_FAULT_OOM; | |
1546 | mutex_unlock(&vdev->vma_lock); | |
1547 | goto up_out; | |
1548 | } | |
1549 | ||
1550 | mutex_unlock(&vdev->vma_lock); | |
11c4cd07 AW |
1551 | |
1552 | if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, | |
1553 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
abafbc55 | 1554 | ret = VM_FAULT_SIGBUS; |
11c4cd07 | 1555 | |
abafbc55 AW |
1556 | up_out: |
1557 | up_read(&vdev->memory_lock); | |
1558 | return ret; | |
11c4cd07 AW |
1559 | } |
1560 | ||
1561 | static const struct vm_operations_struct vfio_pci_mmap_ops = { | |
1562 | .open = vfio_pci_mmap_open, | |
1563 | .close = vfio_pci_mmap_close, | |
1564 | .fault = vfio_pci_mmap_fault, | |
1565 | }; | |
1566 | ||
89e1f7d4 AW |
1567 | static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) |
1568 | { | |
1569 | struct vfio_pci_device *vdev = device_data; | |
1570 | struct pci_dev *pdev = vdev->pdev; | |
1571 | unsigned int index; | |
34002f54 | 1572 | u64 phys_len, req_len, pgoff, req_start; |
89e1f7d4 AW |
1573 | int ret; |
1574 | ||
1575 | index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); | |
1576 | ||
1577 | if (vma->vm_end < vma->vm_start) | |
1578 | return -EINVAL; | |
1579 | if ((vma->vm_flags & VM_SHARED) == 0) | |
1580 | return -EINVAL; | |
a15b1883 AK |
1581 | if (index >= VFIO_PCI_NUM_REGIONS) { |
1582 | int regnum = index - VFIO_PCI_NUM_REGIONS; | |
1583 | struct vfio_pci_region *region = vdev->region + regnum; | |
1584 | ||
1585 | if (region && region->ops && region->ops->mmap && | |
1586 | (region->flags & VFIO_REGION_INFO_FLAG_MMAP)) | |
1587 | return region->ops->mmap(vdev, region, vma); | |
1588 | return -EINVAL; | |
1589 | } | |
89e1f7d4 AW |
1590 | if (index >= VFIO_PCI_ROM_REGION_INDEX) |
1591 | return -EINVAL; | |
05f0c03f | 1592 | if (!vdev->bar_mmap_supported[index]) |
89e1f7d4 AW |
1593 | return -EINVAL; |
1594 | ||
05f0c03f | 1595 | phys_len = PAGE_ALIGN(pci_resource_len(pdev, index)); |
89e1f7d4 AW |
1596 | req_len = vma->vm_end - vma->vm_start; |
1597 | pgoff = vma->vm_pgoff & | |
1598 | ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); | |
1599 | req_start = pgoff << PAGE_SHIFT; | |
1600 | ||
05f0c03f | 1601 | if (req_start + req_len > phys_len) |
89e1f7d4 AW |
1602 | return -EINVAL; |
1603 | ||
89e1f7d4 AW |
1604 | /* |
1605 | * Even though we don't make use of the barmap for the mmap, | |
1606 | * we need to request the region and the barmap tracks that. | |
1607 | */ | |
1608 | if (!vdev->barmap[index]) { | |
1609 | ret = pci_request_selected_regions(pdev, | |
1610 | 1 << index, "vfio-pci"); | |
1611 | if (ret) | |
1612 | return ret; | |
1613 | ||
1614 | vdev->barmap[index] = pci_iomap(pdev, index, 0); | |
e19f32da AY |
1615 | if (!vdev->barmap[index]) { |
1616 | pci_release_selected_regions(pdev, 1 << index); | |
1617 | return -ENOMEM; | |
1618 | } | |
89e1f7d4 AW |
1619 | } |
1620 | ||
1621 | vma->vm_private_data = vdev; | |
89e1f7d4 | 1622 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
34002f54 | 1623 | vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff; |
89e1f7d4 | 1624 | |
11c4cd07 AW |
1625 | /* |
1626 | * See remap_pfn_range(), called from vfio_pci_fault() but we can't | |
1627 | * change vm_flags within the fault handler. Set them now. | |
1628 | */ | |
1629 | vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; | |
1630 | vma->vm_ops = &vfio_pci_mmap_ops; | |
1631 | ||
1632 | return 0; | |
89e1f7d4 AW |
1633 | } |
1634 | ||
6140a8f5 AW |
1635 | static void vfio_pci_request(void *device_data, unsigned int count) |
1636 | { | |
1637 | struct vfio_pci_device *vdev = device_data; | |
a88a7b3e | 1638 | struct pci_dev *pdev = vdev->pdev; |
6140a8f5 AW |
1639 | |
1640 | mutex_lock(&vdev->igate); | |
1641 | ||
1642 | if (vdev->req_trigger) { | |
5f55d2ae | 1643 | if (!(count % 10)) |
a88a7b3e | 1644 | pci_notice_ratelimited(pdev, |
5f55d2ae AW |
1645 | "Relaying device request to user (#%u)\n", |
1646 | count); | |
6140a8f5 | 1647 | eventfd_signal(vdev->req_trigger, 1); |
5f55d2ae | 1648 | } else if (count == 0) { |
a88a7b3e | 1649 | pci_warn(pdev, |
5f55d2ae | 1650 | "No device request channel registered, blocked until released by user\n"); |
6140a8f5 AW |
1651 | } |
1652 | ||
1653 | mutex_unlock(&vdev->igate); | |
1654 | } | |
1655 | ||
cc20d799 AW |
1656 | static int vfio_pci_validate_vf_token(struct vfio_pci_device *vdev, |
1657 | bool vf_token, uuid_t *uuid) | |
1658 | { | |
1659 | /* | |
1660 | * There's always some degree of trust or collaboration between SR-IOV | |
1661 | * PF and VFs, even if just that the PF hosts the SR-IOV capability and | |
1662 | * can disrupt VFs with a reset, but often the PF has more explicit | |
1663 | * access to deny service to the VF or access data passed through the | |
1664 | * VF. We therefore require an opt-in via a shared VF token (UUID) to | |
1665 | * represent this trust. This both prevents that a VF driver might | |
1666 | * assume the PF driver is a trusted, in-kernel driver, and also that | |
1667 | * a PF driver might be replaced with a rogue driver, unknown to in-use | |
1668 | * VF drivers. | |
1669 | * | |
1670 | * Therefore when presented with a VF, if the PF is a vfio device and | |
1671 | * it is bound to the vfio-pci driver, the user needs to provide a VF | |
1672 | * token to access the device, in the form of appending a vf_token to | |
1673 | * the device name, for example: | |
1674 | * | |
1675 | * "0000:04:10.0 vf_token=bd8d9d2b-5a5f-4f5a-a211-f591514ba1f3" | |
1676 | * | |
1677 | * When presented with a PF which has VFs in use, the user must also | |
1678 | * provide the current VF token to prove collaboration with existing | |
1679 | * VF users. If VFs are not in use, the VF token provided for the PF | |
1680 | * device will act to set the VF token. | |
1681 | * | |
1682 | * If the VF token is provided but unused, an error is generated. | |
1683 | */ | |
1684 | if (!vdev->pdev->is_virtfn && !vdev->vf_token && !vf_token) | |
1685 | return 0; /* No VF token provided or required */ | |
1686 | ||
1687 | if (vdev->pdev->is_virtfn) { | |
1688 | struct vfio_device *pf_dev; | |
1689 | struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev, &pf_dev); | |
1690 | bool match; | |
1691 | ||
1692 | if (!pf_vdev) { | |
1693 | if (!vf_token) | |
1694 | return 0; /* PF is not vfio-pci, no VF token */ | |
1695 | ||
1696 | pci_info_ratelimited(vdev->pdev, | |
1697 | "VF token incorrectly provided, PF not bound to vfio-pci\n"); | |
1698 | return -EINVAL; | |
1699 | } | |
1700 | ||
1701 | if (!vf_token) { | |
1702 | vfio_device_put(pf_dev); | |
1703 | pci_info_ratelimited(vdev->pdev, | |
1704 | "VF token required to access device\n"); | |
1705 | return -EACCES; | |
1706 | } | |
1707 | ||
1708 | mutex_lock(&pf_vdev->vf_token->lock); | |
1709 | match = uuid_equal(uuid, &pf_vdev->vf_token->uuid); | |
1710 | mutex_unlock(&pf_vdev->vf_token->lock); | |
1711 | ||
1712 | vfio_device_put(pf_dev); | |
1713 | ||
1714 | if (!match) { | |
1715 | pci_info_ratelimited(vdev->pdev, | |
1716 | "Incorrect VF token provided for device\n"); | |
1717 | return -EACCES; | |
1718 | } | |
1719 | } else if (vdev->vf_token) { | |
1720 | mutex_lock(&vdev->vf_token->lock); | |
1721 | if (vdev->vf_token->users) { | |
1722 | if (!vf_token) { | |
1723 | mutex_unlock(&vdev->vf_token->lock); | |
1724 | pci_info_ratelimited(vdev->pdev, | |
1725 | "VF token required to access device\n"); | |
1726 | return -EACCES; | |
1727 | } | |
1728 | ||
1729 | if (!uuid_equal(uuid, &vdev->vf_token->uuid)) { | |
1730 | mutex_unlock(&vdev->vf_token->lock); | |
1731 | pci_info_ratelimited(vdev->pdev, | |
1732 | "Incorrect VF token provided for device\n"); | |
1733 | return -EACCES; | |
1734 | } | |
1735 | } else if (vf_token) { | |
1736 | uuid_copy(&vdev->vf_token->uuid, uuid); | |
1737 | } | |
1738 | ||
1739 | mutex_unlock(&vdev->vf_token->lock); | |
1740 | } else if (vf_token) { | |
1741 | pci_info_ratelimited(vdev->pdev, | |
1742 | "VF token incorrectly provided, not a PF or VF\n"); | |
1743 | return -EINVAL; | |
1744 | } | |
1745 | ||
1746 | return 0; | |
1747 | } | |
1748 | ||
1749 | #define VF_TOKEN_ARG "vf_token=" | |
1750 | ||
467c084f AW |
1751 | static int vfio_pci_match(void *device_data, char *buf) |
1752 | { | |
1753 | struct vfio_pci_device *vdev = device_data; | |
cc20d799 AW |
1754 | bool vf_token = false; |
1755 | uuid_t uuid; | |
1756 | int ret; | |
1757 | ||
1758 | if (strncmp(pci_name(vdev->pdev), buf, strlen(pci_name(vdev->pdev)))) | |
1759 | return 0; /* No match */ | |
1760 | ||
1761 | if (strlen(buf) > strlen(pci_name(vdev->pdev))) { | |
1762 | buf += strlen(pci_name(vdev->pdev)); | |
1763 | ||
1764 | if (*buf != ' ') | |
1765 | return 0; /* No match: non-whitespace after name */ | |
1766 | ||
1767 | while (*buf) { | |
1768 | if (*buf == ' ') { | |
1769 | buf++; | |
1770 | continue; | |
1771 | } | |
1772 | ||
1773 | if (!vf_token && !strncmp(buf, VF_TOKEN_ARG, | |
1774 | strlen(VF_TOKEN_ARG))) { | |
1775 | buf += strlen(VF_TOKEN_ARG); | |
1776 | ||
1777 | if (strlen(buf) < UUID_STRING_LEN) | |
1778 | return -EINVAL; | |
1779 | ||
1780 | ret = uuid_parse(buf, &uuid); | |
1781 | if (ret) | |
1782 | return ret; | |
467c084f | 1783 | |
cc20d799 AW |
1784 | vf_token = true; |
1785 | buf += UUID_STRING_LEN; | |
1786 | } else { | |
1787 | /* Unknown/duplicate option */ | |
1788 | return -EINVAL; | |
1789 | } | |
1790 | } | |
1791 | } | |
1792 | ||
1793 | ret = vfio_pci_validate_vf_token(vdev, vf_token, &uuid); | |
1794 | if (ret) | |
1795 | return ret; | |
1796 | ||
1797 | return 1; /* Match */ | |
467c084f AW |
1798 | } |
1799 | ||
89e1f7d4 AW |
1800 | static const struct vfio_device_ops vfio_pci_ops = { |
1801 | .name = "vfio-pci", | |
1802 | .open = vfio_pci_open, | |
1803 | .release = vfio_pci_release, | |
1804 | .ioctl = vfio_pci_ioctl, | |
1805 | .read = vfio_pci_read, | |
1806 | .write = vfio_pci_write, | |
1807 | .mmap = vfio_pci_mmap, | |
6140a8f5 | 1808 | .request = vfio_pci_request, |
467c084f | 1809 | .match = vfio_pci_match, |
89e1f7d4 AW |
1810 | }; |
1811 | ||
e309df5b AW |
1812 | static int vfio_pci_reflck_attach(struct vfio_pci_device *vdev); |
1813 | static void vfio_pci_reflck_put(struct vfio_pci_reflck *reflck); | |
137e5531 AW |
1814 | static struct pci_driver vfio_pci_driver; |
1815 | ||
1816 | static int vfio_pci_bus_notifier(struct notifier_block *nb, | |
1817 | unsigned long action, void *data) | |
1818 | { | |
1819 | struct vfio_pci_device *vdev = container_of(nb, | |
1820 | struct vfio_pci_device, nb); | |
1821 | struct device *dev = data; | |
1822 | struct pci_dev *pdev = to_pci_dev(dev); | |
1823 | struct pci_dev *physfn = pci_physfn(pdev); | |
1824 | ||
1825 | if (action == BUS_NOTIFY_ADD_DEVICE && | |
1826 | pdev->is_virtfn && physfn == vdev->pdev) { | |
1827 | pci_info(vdev->pdev, "Captured SR-IOV VF %s driver_override\n", | |
1828 | pci_name(pdev)); | |
1829 | pdev->driver_override = kasprintf(GFP_KERNEL, "%s", | |
1830 | vfio_pci_ops.name); | |
1831 | } else if (action == BUS_NOTIFY_BOUND_DRIVER && | |
1832 | pdev->is_virtfn && physfn == vdev->pdev) { | |
1833 | struct pci_driver *drv = pci_dev_driver(pdev); | |
1834 | ||
1835 | if (drv && drv != &vfio_pci_driver) | |
1836 | pci_warn(vdev->pdev, | |
1837 | "VF %s bound to driver %s while PF bound to vfio-pci\n", | |
1838 | pci_name(pdev), drv->name); | |
1839 | } | |
1840 | ||
1841 | return 0; | |
1842 | } | |
e309df5b | 1843 | |
89e1f7d4 AW |
1844 | static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
1845 | { | |
89e1f7d4 AW |
1846 | struct vfio_pci_device *vdev; |
1847 | struct iommu_group *group; | |
1848 | int ret; | |
1849 | ||
7c2e211f | 1850 | if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL) |
89e1f7d4 AW |
1851 | return -EINVAL; |
1852 | ||
0dd0e297 | 1853 | /* |
137e5531 AW |
1854 | * Prevent binding to PFs with VFs enabled, the VFs might be in use |
1855 | * by the host or other users. We cannot capture the VFs if they | |
1856 | * already exist, nor can we track VF users. Disabling SR-IOV here | |
1857 | * would initiate removing the VFs, which would unbind the driver, | |
1858 | * which is prone to blocking if that VF is also in use by vfio-pci. | |
1859 | * Just reject these PFs and let the user sort it out. | |
0dd0e297 AW |
1860 | */ |
1861 | if (pci_num_vf(pdev)) { | |
1862 | pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n"); | |
1863 | return -EBUSY; | |
1864 | } | |
1865 | ||
03a76b60 | 1866 | group = vfio_iommu_group_get(&pdev->dev); |
89e1f7d4 AW |
1867 | if (!group) |
1868 | return -EINVAL; | |
1869 | ||
1870 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); | |
1871 | if (!vdev) { | |
b66574a3 AW |
1872 | ret = -ENOMEM; |
1873 | goto out_group_put; | |
89e1f7d4 AW |
1874 | } |
1875 | ||
1876 | vdev->pdev = pdev; | |
1877 | vdev->irq_type = VFIO_PCI_NUM_IRQS; | |
1878 | mutex_init(&vdev->igate); | |
1879 | spin_lock_init(&vdev->irqlock); | |
30656177 AW |
1880 | mutex_init(&vdev->ioeventfds_lock); |
1881 | INIT_LIST_HEAD(&vdev->ioeventfds_list); | |
11c4cd07 AW |
1882 | mutex_init(&vdev->vma_lock); |
1883 | INIT_LIST_HEAD(&vdev->vma_list); | |
abafbc55 | 1884 | init_rwsem(&vdev->memory_lock); |
89e1f7d4 AW |
1885 | |
1886 | ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); | |
b66574a3 AW |
1887 | if (ret) |
1888 | goto out_free; | |
89e1f7d4 | 1889 | |
e309df5b | 1890 | ret = vfio_pci_reflck_attach(vdev); |
b66574a3 AW |
1891 | if (ret) |
1892 | goto out_del_group_dev; | |
e309df5b | 1893 | |
cc20d799 AW |
1894 | if (pdev->is_physfn) { |
1895 | vdev->vf_token = kzalloc(sizeof(*vdev->vf_token), GFP_KERNEL); | |
1896 | if (!vdev->vf_token) { | |
b66574a3 AW |
1897 | ret = -ENOMEM; |
1898 | goto out_reflck; | |
137e5531 AW |
1899 | } |
1900 | ||
cc20d799 AW |
1901 | mutex_init(&vdev->vf_token->lock); |
1902 | uuid_gen(&vdev->vf_token->uuid); | |
b66574a3 AW |
1903 | |
1904 | vdev->nb.notifier_call = vfio_pci_bus_notifier; | |
1905 | ret = bus_register_notifier(&pci_bus_type, &vdev->nb); | |
1906 | if (ret) | |
1907 | goto out_vf_token; | |
cc20d799 AW |
1908 | } |
1909 | ||
ecaa1f6a AW |
1910 | if (vfio_pci_is_vga(pdev)) { |
1911 | vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode); | |
1912 | vga_set_legacy_decoding(pdev, | |
1913 | vfio_pci_set_vga_decode(vdev, false)); | |
1914 | } | |
1915 | ||
51ef3a00 AW |
1916 | vfio_pci_probe_power_state(vdev); |
1917 | ||
6eb70187 AW |
1918 | if (!disable_idle_d3) { |
1919 | /* | |
1920 | * pci-core sets the device power state to an unknown value at | |
1921 | * bootup and after being removed from a driver. The only | |
1922 | * transition it allows from this unknown state is to D0, which | |
1923 | * typically happens when a driver calls pci_enable_device(). | |
1924 | * We're not ready to enable the device yet, but we do want to | |
1925 | * be able to get to D3. Therefore first do a D0 transition | |
1926 | * before going to D3. | |
1927 | */ | |
51ef3a00 AW |
1928 | vfio_pci_set_power_state(vdev, PCI_D0); |
1929 | vfio_pci_set_power_state(vdev, PCI_D3hot); | |
6eb70187 AW |
1930 | } |
1931 | ||
89e1f7d4 | 1932 | return ret; |
b66574a3 AW |
1933 | |
1934 | out_vf_token: | |
1935 | kfree(vdev->vf_token); | |
1936 | out_reflck: | |
1937 | vfio_pci_reflck_put(vdev->reflck); | |
1938 | out_del_group_dev: | |
1939 | vfio_del_group_dev(&pdev->dev); | |
1940 | out_free: | |
1941 | kfree(vdev); | |
1942 | out_group_put: | |
1943 | vfio_iommu_group_put(group, &pdev->dev); | |
1944 | return ret; | |
89e1f7d4 AW |
1945 | } |
1946 | ||
1947 | static void vfio_pci_remove(struct pci_dev *pdev) | |
1948 | { | |
1949 | struct vfio_pci_device *vdev; | |
1950 | ||
137e5531 AW |
1951 | pci_disable_sriov(pdev); |
1952 | ||
89e1f7d4 | 1953 | vdev = vfio_del_group_dev(&pdev->dev); |
ecaa1f6a AW |
1954 | if (!vdev) |
1955 | return; | |
1956 | ||
cc20d799 AW |
1957 | if (vdev->vf_token) { |
1958 | WARN_ON(vdev->vf_token->users); | |
1959 | mutex_destroy(&vdev->vf_token->lock); | |
1960 | kfree(vdev->vf_token); | |
1961 | } | |
1962 | ||
137e5531 AW |
1963 | if (vdev->nb.notifier_call) |
1964 | bus_unregister_notifier(&pci_bus_type, &vdev->nb); | |
1965 | ||
e309df5b AW |
1966 | vfio_pci_reflck_put(vdev->reflck); |
1967 | ||
03a76b60 | 1968 | vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev); |
28541d41 | 1969 | kfree(vdev->region); |
30656177 | 1970 | mutex_destroy(&vdev->ioeventfds_lock); |
51ef3a00 AW |
1971 | |
1972 | if (!disable_idle_d3) | |
1973 | vfio_pci_set_power_state(vdev, PCI_D0); | |
1974 | ||
1975 | kfree(vdev->pm_save); | |
ecaa1f6a AW |
1976 | kfree(vdev); |
1977 | ||
1978 | if (vfio_pci_is_vga(pdev)) { | |
1979 | vga_client_register(pdev, NULL, NULL, NULL); | |
1980 | vga_set_legacy_decoding(pdev, | |
1981 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | | |
1982 | VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); | |
61d79256 | 1983 | } |
89e1f7d4 AW |
1984 | } |
1985 | ||
dad9f897 VMP |
1986 | static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, |
1987 | pci_channel_state_t state) | |
1988 | { | |
1989 | struct vfio_pci_device *vdev; | |
1990 | struct vfio_device *device; | |
1991 | ||
1992 | device = vfio_device_get_from_dev(&pdev->dev); | |
1993 | if (device == NULL) | |
1994 | return PCI_ERS_RESULT_DISCONNECT; | |
1995 | ||
1996 | vdev = vfio_device_data(device); | |
1997 | if (vdev == NULL) { | |
1998 | vfio_device_put(device); | |
1999 | return PCI_ERS_RESULT_DISCONNECT; | |
2000 | } | |
2001 | ||
3be3a074 AW |
2002 | mutex_lock(&vdev->igate); |
2003 | ||
dad9f897 VMP |
2004 | if (vdev->err_trigger) |
2005 | eventfd_signal(vdev->err_trigger, 1); | |
2006 | ||
3be3a074 AW |
2007 | mutex_unlock(&vdev->igate); |
2008 | ||
dad9f897 VMP |
2009 | vfio_device_put(device); |
2010 | ||
2011 | return PCI_ERS_RESULT_CAN_RECOVER; | |
2012 | } | |
2013 | ||
137e5531 AW |
2014 | static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn) |
2015 | { | |
2016 | struct vfio_pci_device *vdev; | |
2017 | struct vfio_device *device; | |
2018 | int ret = 0; | |
2019 | ||
2020 | might_sleep(); | |
2021 | ||
2022 | if (!enable_sriov) | |
2023 | return -ENOENT; | |
2024 | ||
2025 | device = vfio_device_get_from_dev(&pdev->dev); | |
2026 | if (!device) | |
2027 | return -ENODEV; | |
2028 | ||
2029 | vdev = vfio_device_data(device); | |
2030 | if (!vdev) { | |
2031 | vfio_device_put(device); | |
2032 | return -ENODEV; | |
2033 | } | |
2034 | ||
2035 | if (nr_virtfn == 0) | |
2036 | pci_disable_sriov(pdev); | |
2037 | else | |
2038 | ret = pci_enable_sriov(pdev, nr_virtfn); | |
2039 | ||
2040 | vfio_device_put(device); | |
2041 | ||
2042 | return ret < 0 ? ret : nr_virtfn; | |
2043 | } | |
2044 | ||
7d10f4e0 | 2045 | static const struct pci_error_handlers vfio_err_handlers = { |
dad9f897 VMP |
2046 | .error_detected = vfio_pci_aer_err_detected, |
2047 | }; | |
2048 | ||
89e1f7d4 | 2049 | static struct pci_driver vfio_pci_driver = { |
137e5531 AW |
2050 | .name = "vfio-pci", |
2051 | .id_table = NULL, /* only dynamic ids */ | |
2052 | .probe = vfio_pci_probe, | |
2053 | .remove = vfio_pci_remove, | |
2054 | .sriov_configure = vfio_pci_sriov_configure, | |
2055 | .err_handler = &vfio_err_handlers, | |
89e1f7d4 AW |
2056 | }; |
2057 | ||
e309df5b AW |
2058 | static DEFINE_MUTEX(reflck_lock); |
2059 | ||
2060 | static struct vfio_pci_reflck *vfio_pci_reflck_alloc(void) | |
2061 | { | |
2062 | struct vfio_pci_reflck *reflck; | |
2063 | ||
2064 | reflck = kzalloc(sizeof(*reflck), GFP_KERNEL); | |
2065 | if (!reflck) | |
2066 | return ERR_PTR(-ENOMEM); | |
2067 | ||
2068 | kref_init(&reflck->kref); | |
2069 | mutex_init(&reflck->lock); | |
2070 | ||
2071 | return reflck; | |
2072 | } | |
2073 | ||
2074 | static void vfio_pci_reflck_get(struct vfio_pci_reflck *reflck) | |
2075 | { | |
2076 | kref_get(&reflck->kref); | |
2077 | } | |
2078 | ||
2079 | static int vfio_pci_reflck_find(struct pci_dev *pdev, void *data) | |
2080 | { | |
2081 | struct vfio_pci_reflck **preflck = data; | |
2082 | struct vfio_device *device; | |
2083 | struct vfio_pci_device *vdev; | |
2084 | ||
2085 | device = vfio_device_get_from_dev(&pdev->dev); | |
2086 | if (!device) | |
2087 | return 0; | |
2088 | ||
2089 | if (pci_dev_driver(pdev) != &vfio_pci_driver) { | |
2090 | vfio_device_put(device); | |
2091 | return 0; | |
2092 | } | |
2093 | ||
2094 | vdev = vfio_device_data(device); | |
2095 | ||
2096 | if (vdev->reflck) { | |
2097 | vfio_pci_reflck_get(vdev->reflck); | |
2098 | *preflck = vdev->reflck; | |
2099 | vfio_device_put(device); | |
2100 | return 1; | |
2101 | } | |
2102 | ||
2103 | vfio_device_put(device); | |
2104 | return 0; | |
2105 | } | |
2106 | ||
2107 | static int vfio_pci_reflck_attach(struct vfio_pci_device *vdev) | |
2108 | { | |
2109 | bool slot = !pci_probe_reset_slot(vdev->pdev->slot); | |
2110 | ||
2111 | mutex_lock(&reflck_lock); | |
2112 | ||
2113 | if (pci_is_root_bus(vdev->pdev->bus) || | |
2114 | vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_reflck_find, | |
2115 | &vdev->reflck, slot) <= 0) | |
2116 | vdev->reflck = vfio_pci_reflck_alloc(); | |
2117 | ||
2118 | mutex_unlock(&reflck_lock); | |
2119 | ||
2120 | return PTR_ERR_OR_ZERO(vdev->reflck); | |
2121 | } | |
2122 | ||
2123 | static void vfio_pci_reflck_release(struct kref *kref) | |
2124 | { | |
2125 | struct vfio_pci_reflck *reflck = container_of(kref, | |
2126 | struct vfio_pci_reflck, | |
2127 | kref); | |
2128 | ||
2129 | kfree(reflck); | |
2130 | mutex_unlock(&reflck_lock); | |
2131 | } | |
2132 | ||
2133 | static void vfio_pci_reflck_put(struct vfio_pci_reflck *reflck) | |
2134 | { | |
2135 | kref_put_mutex(&reflck->kref, vfio_pci_reflck_release, &reflck_lock); | |
2136 | } | |
2137 | ||
e309df5b | 2138 | static int vfio_pci_get_unused_devs(struct pci_dev *pdev, void *data) |
bc4fba77 | 2139 | { |
93899a67 | 2140 | struct vfio_devices *devs = data; |
20f30017 | 2141 | struct vfio_device *device; |
e309df5b | 2142 | struct vfio_pci_device *vdev; |
bc4fba77 | 2143 | |
93899a67 AW |
2144 | if (devs->cur_index == devs->max_index) |
2145 | return -ENOSPC; | |
bc4fba77 | 2146 | |
20f30017 AW |
2147 | device = vfio_device_get_from_dev(&pdev->dev); |
2148 | if (!device) | |
93899a67 | 2149 | return -EINVAL; |
bc4fba77 | 2150 | |
20f30017 AW |
2151 | if (pci_dev_driver(pdev) != &vfio_pci_driver) { |
2152 | vfio_device_put(device); | |
2153 | return -EBUSY; | |
2154 | } | |
2155 | ||
e309df5b AW |
2156 | vdev = vfio_device_data(device); |
2157 | ||
2158 | /* Fault if the device is not unused */ | |
2159 | if (vdev->refcnt) { | |
2160 | vfio_device_put(device); | |
2161 | return -EBUSY; | |
2162 | } | |
2163 | ||
20f30017 | 2164 | devs->devices[devs->cur_index++] = device; |
bc4fba77 AW |
2165 | return 0; |
2166 | } | |
2167 | ||
abafbc55 AW |
2168 | static int vfio_pci_try_zap_and_vma_lock_cb(struct pci_dev *pdev, void *data) |
2169 | { | |
2170 | struct vfio_devices *devs = data; | |
2171 | struct vfio_device *device; | |
2172 | struct vfio_pci_device *vdev; | |
2173 | ||
2174 | if (devs->cur_index == devs->max_index) | |
2175 | return -ENOSPC; | |
2176 | ||
2177 | device = vfio_device_get_from_dev(&pdev->dev); | |
2178 | if (!device) | |
2179 | return -EINVAL; | |
2180 | ||
2181 | if (pci_dev_driver(pdev) != &vfio_pci_driver) { | |
2182 | vfio_device_put(device); | |
2183 | return -EBUSY; | |
2184 | } | |
2185 | ||
2186 | vdev = vfio_device_data(device); | |
2187 | ||
2188 | /* | |
2189 | * Locking multiple devices is prone to deadlock, runaway and | |
2190 | * unwind if we hit contention. | |
2191 | */ | |
2192 | if (!vfio_pci_zap_and_vma_lock(vdev, true)) { | |
2193 | vfio_device_put(device); | |
2194 | return -EBUSY; | |
2195 | } | |
2196 | ||
2197 | devs->devices[devs->cur_index++] = device; | |
2198 | return 0; | |
2199 | } | |
2200 | ||
bc4fba77 | 2201 | /* |
e309df5b AW |
2202 | * If a bus or slot reset is available for the provided device and: |
2203 | * - All of the devices affected by that bus or slot reset are unused | |
2204 | * (!refcnt) | |
2205 | * - At least one of the affected devices is marked dirty via | |
2206 | * needs_reset (such as by lack of FLR support) | |
2207 | * Then attempt to perform that bus or slot reset. Callers are required | |
2208 | * to hold vdev->reflck->lock, protecting the bus/slot reset group from | |
2209 | * concurrent opens. A vfio_device reference is acquired for each device | |
2210 | * to prevent unbinds during the reset operation. | |
93899a67 AW |
2211 | * |
2212 | * NB: vfio-core considers a group to be viable even if some devices are | |
2213 | * bound to drivers like pci-stub or pcieport. Here we require all devices | |
2214 | * to be bound to vfio_pci since that's the only way we can be sure they | |
2215 | * stay put. | |
bc4fba77 AW |
2216 | */ |
2217 | static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) | |
2218 | { | |
93899a67 AW |
2219 | struct vfio_devices devs = { .cur_index = 0 }; |
2220 | int i = 0, ret = -EINVAL; | |
e309df5b | 2221 | bool slot = false; |
93899a67 | 2222 | struct vfio_pci_device *tmp; |
bc4fba77 AW |
2223 | |
2224 | if (!pci_probe_reset_slot(vdev->pdev->slot)) | |
2225 | slot = true; | |
2226 | else if (pci_probe_reset_bus(vdev->pdev->bus)) | |
2227 | return; | |
2228 | ||
93899a67 AW |
2229 | if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs, |
2230 | &i, slot) || !i) | |
bc4fba77 AW |
2231 | return; |
2232 | ||
93899a67 AW |
2233 | devs.max_index = i; |
2234 | devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL); | |
2235 | if (!devs.devices) | |
bc4fba77 AW |
2236 | return; |
2237 | ||
93899a67 | 2238 | if (vfio_pci_for_each_slot_or_bus(vdev->pdev, |
e309df5b AW |
2239 | vfio_pci_get_unused_devs, |
2240 | &devs, slot)) | |
93899a67 AW |
2241 | goto put_devs; |
2242 | ||
e309df5b | 2243 | /* Does at least one need a reset? */ |
93899a67 AW |
2244 | for (i = 0; i < devs.cur_index; i++) { |
2245 | tmp = vfio_device_data(devs.devices[i]); | |
e309df5b AW |
2246 | if (tmp->needs_reset) { |
2247 | ret = pci_reset_bus(vdev->pdev); | |
2248 | break; | |
2249 | } | |
93899a67 AW |
2250 | } |
2251 | ||
93899a67 AW |
2252 | put_devs: |
2253 | for (i = 0; i < devs.cur_index; i++) { | |
6eb70187 | 2254 | tmp = vfio_device_data(devs.devices[i]); |
e309df5b AW |
2255 | |
2256 | /* | |
2257 | * If reset was successful, affected devices no longer need | |
2258 | * a reset and we should return all the collateral devices | |
2259 | * to low power. If not successful, we either didn't reset | |
2260 | * the bus or timed out waiting for it, so let's not touch | |
2261 | * the power state. | |
2262 | */ | |
2263 | if (!ret) { | |
93899a67 | 2264 | tmp->needs_reset = false; |
6eb70187 | 2265 | |
e309df5b | 2266 | if (tmp != vdev && !disable_idle_d3) |
51ef3a00 | 2267 | vfio_pci_set_power_state(tmp, PCI_D3hot); |
e309df5b | 2268 | } |
6eb70187 | 2269 | |
93899a67 AW |
2270 | vfio_device_put(devs.devices[i]); |
2271 | } | |
2272 | ||
2273 | kfree(devs.devices); | |
bc4fba77 AW |
2274 | } |
2275 | ||
89e1f7d4 AW |
2276 | static void __exit vfio_pci_cleanup(void) |
2277 | { | |
2278 | pci_unregister_driver(&vfio_pci_driver); | |
89e1f7d4 AW |
2279 | vfio_pci_uninit_perm_bits(); |
2280 | } | |
2281 | ||
80c7e8cc AW |
2282 | static void __init vfio_pci_fill_ids(void) |
2283 | { | |
2284 | char *p, *id; | |
2285 | int rc; | |
2286 | ||
2287 | /* no ids passed actually */ | |
2288 | if (ids[0] == '\0') | |
2289 | return; | |
2290 | ||
2291 | /* add ids specified in the module parameter */ | |
2292 | p = ids; | |
2293 | while ((id = strsep(&p, ","))) { | |
2294 | unsigned int vendor, device, subvendor = PCI_ANY_ID, | |
2295 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
2296 | int fields; | |
2297 | ||
2298 | if (!strlen(id)) | |
2299 | continue; | |
2300 | ||
2301 | fields = sscanf(id, "%x:%x:%x:%x:%x:%x", | |
2302 | &vendor, &device, &subvendor, &subdevice, | |
2303 | &class, &class_mask); | |
2304 | ||
2305 | if (fields < 2) { | |
2306 | pr_warn("invalid id string \"%s\"\n", id); | |
2307 | continue; | |
2308 | } | |
2309 | ||
2310 | rc = pci_add_dynid(&vfio_pci_driver, vendor, device, | |
2311 | subvendor, subdevice, class, class_mask, 0); | |
2312 | if (rc) | |
426b046b | 2313 | pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n", |
80c7e8cc AW |
2314 | vendor, device, subvendor, subdevice, |
2315 | class, class_mask, rc); | |
2316 | else | |
426b046b | 2317 | pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n", |
80c7e8cc AW |
2318 | vendor, device, subvendor, subdevice, |
2319 | class, class_mask); | |
2320 | } | |
2321 | } | |
2322 | ||
89e1f7d4 AW |
2323 | static int __init vfio_pci_init(void) |
2324 | { | |
2325 | int ret; | |
2326 | ||
2327 | /* Allocate shared config space permision data used by all devices */ | |
2328 | ret = vfio_pci_init_perm_bits(); | |
2329 | if (ret) | |
2330 | return ret; | |
2331 | ||
89e1f7d4 AW |
2332 | /* Register and scan for devices */ |
2333 | ret = pci_register_driver(&vfio_pci_driver); | |
2334 | if (ret) | |
2335 | goto out_driver; | |
2336 | ||
80c7e8cc AW |
2337 | vfio_pci_fill_ids(); |
2338 | ||
89e1f7d4 AW |
2339 | return 0; |
2340 | ||
89e1f7d4 AW |
2341 | out_driver: |
2342 | vfio_pci_uninit_perm_bits(); | |
2343 | return ret; | |
2344 | } | |
2345 | ||
2346 | module_init(vfio_pci_init); | |
2347 | module_exit(vfio_pci_cleanup); | |
2348 | ||
2349 | MODULE_VERSION(DRIVER_VERSION); | |
2350 | MODULE_LICENSE("GPL v2"); | |
2351 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
2352 | MODULE_DESCRIPTION(DRIVER_DESC); |