]>
Commit | Line | Data |
---|---|---|
65501a74 AW |
1 | /* |
2 | * vfio based device assignment support | |
3 | * | |
4 | * Copyright Red Hat, Inc. 2012 | |
5 | * | |
6 | * Authors: | |
7 | * Alex Williamson <alex.williamson@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | * Based on qemu-kvm device-assignment: | |
13 | * Adapted for KVM by Qumranet. | |
14 | * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com) | |
15 | * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com) | |
16 | * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com) | |
17 | * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com) | |
18 | * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com) | |
19 | */ | |
20 | ||
21 | #include <dirent.h> | |
22 | #include <unistd.h> | |
23 | #include <sys/ioctl.h> | |
24 | #include <sys/mman.h> | |
25 | #include <sys/stat.h> | |
26 | #include <sys/types.h> | |
27 | #include <linux/vfio.h> | |
28 | ||
29 | #include "config.h" | |
30 | #include "event_notifier.h" | |
31 | #include "exec-memory.h" | |
32 | #include "kvm.h" | |
33 | #include "memory.h" | |
34 | #include "msi.h" | |
35 | #include "msix.h" | |
36 | #include "qemu-error.h" | |
37 | #include "range.h" | |
38 | #include "vfio_pci_int.h" | |
39 | ||
40 | /* #define DEBUG_VFIO */ | |
41 | #ifdef DEBUG_VFIO | |
42 | #define DPRINTF(fmt, ...) \ | |
43 | do { fprintf(stderr, "vfio: " fmt, ## __VA_ARGS__); } while (0) | |
44 | #else | |
45 | #define DPRINTF(fmt, ...) \ | |
46 | do { } while (0) | |
47 | #endif | |
48 | ||
49 | #define MSIX_CAP_LENGTH 12 | |
50 | ||
51 | static QLIST_HEAD(, VFIOContainer) | |
52 | container_list = QLIST_HEAD_INITIALIZER(container_list); | |
53 | ||
54 | static QLIST_HEAD(, VFIOGroup) | |
55 | group_list = QLIST_HEAD_INITIALIZER(group_list); | |
56 | ||
57 | static void vfio_disable_interrupts(VFIODevice *vdev); | |
58 | static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len); | |
59 | static void vfio_mmap_set_enabled(VFIODevice *vdev, bool enabled); | |
60 | ||
61 | /* | |
62 | * Common VFIO interrupt disable | |
63 | */ | |
64 | static void vfio_disable_irqindex(VFIODevice *vdev, int index) | |
65 | { | |
66 | struct vfio_irq_set irq_set = { | |
67 | .argsz = sizeof(irq_set), | |
68 | .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER, | |
69 | .index = index, | |
70 | .start = 0, | |
71 | .count = 0, | |
72 | }; | |
73 | ||
74 | ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); | |
75 | ||
76 | vdev->interrupt = VFIO_INT_NONE; | |
77 | } | |
78 | ||
79 | /* | |
80 | * INTx | |
81 | */ | |
82 | static void vfio_unmask_intx(VFIODevice *vdev) | |
83 | { | |
84 | struct vfio_irq_set irq_set = { | |
85 | .argsz = sizeof(irq_set), | |
86 | .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK, | |
87 | .index = VFIO_PCI_INTX_IRQ_INDEX, | |
88 | .start = 0, | |
89 | .count = 1, | |
90 | }; | |
91 | ||
92 | ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set); | |
93 | } | |
94 | ||
95 | static void vfio_intx_interrupt(void *opaque) | |
96 | { | |
97 | VFIODevice *vdev = opaque; | |
98 | ||
99 | if (!event_notifier_test_and_clear(&vdev->intx.interrupt)) { | |
100 | return; | |
101 | } | |
102 | ||
103 | DPRINTF("%s(%04x:%02x:%02x.%x) Pin %c\n", __func__, vdev->host.domain, | |
104 | vdev->host.bus, vdev->host.slot, vdev->host.function, | |
105 | 'A' + vdev->intx.pin); | |
106 | ||
107 | vdev->intx.pending = true; | |
108 | qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 1); | |
109 | } | |
110 | ||
111 | static void vfio_eoi(VFIODevice *vdev) | |
112 | { | |
113 | if (!vdev->intx.pending) { | |
114 | return; | |
115 | } | |
116 | ||
117 | DPRINTF("%s(%04x:%02x:%02x.%x) EOI\n", __func__, vdev->host.domain, | |
118 | vdev->host.bus, vdev->host.slot, vdev->host.function); | |
119 | ||
120 | vdev->intx.pending = false; | |
121 | qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0); | |
122 | vfio_unmask_intx(vdev); | |
123 | } | |
124 | ||
125 | typedef struct QEMU_PACKED VFIOIRQSetFD { | |
126 | struct vfio_irq_set irq_set; | |
127 | int32_t fd; | |
128 | } VFIOIRQSetFD; | |
129 | ||
130 | static int vfio_enable_intx(VFIODevice *vdev) | |
131 | { | |
132 | VFIOIRQSetFD irq_set_fd = { | |
133 | .irq_set = { | |
134 | .argsz = sizeof(irq_set_fd), | |
135 | .flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER, | |
136 | .index = VFIO_PCI_INTX_IRQ_INDEX, | |
137 | .start = 0, | |
138 | .count = 1, | |
139 | }, | |
140 | }; | |
141 | uint8_t pin = vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1); | |
142 | int ret; | |
143 | ||
144 | if (vdev->intx.disabled || !pin) { | |
145 | return 0; | |
146 | } | |
147 | ||
148 | vfio_disable_interrupts(vdev); | |
149 | ||
150 | vdev->intx.pin = pin - 1; /* Pin A (1) -> irq[0] */ | |
151 | ret = event_notifier_init(&vdev->intx.interrupt, 0); | |
152 | if (ret) { | |
153 | error_report("vfio: Error: event_notifier_init failed\n"); | |
154 | return ret; | |
155 | } | |
156 | ||
157 | irq_set_fd.fd = event_notifier_get_fd(&vdev->intx.interrupt); | |
158 | qemu_set_fd_handler(irq_set_fd.fd, vfio_intx_interrupt, NULL, vdev); | |
159 | ||
160 | if (ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd)) { | |
161 | error_report("vfio: Error: Failed to setup INTx fd: %m\n"); | |
162 | return -errno; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Disable mmaps so we can trap on BAR accesses. We interpret any | |
167 | * access as a response to an interrupt and unmask the physical | |
168 | * device. The device will re-assert if the interrupt is still | |
169 | * pending. We'll likely retrigger on the host multiple times per | |
170 | * guest interrupt, but without EOI notification it's better than | |
171 | * nothing. Acceleration paths through KVM will avoid this. | |
172 | */ | |
173 | vfio_mmap_set_enabled(vdev, false); | |
174 | ||
175 | vdev->interrupt = VFIO_INT_INTx; | |
176 | ||
177 | DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain, | |
178 | vdev->host.bus, vdev->host.slot, vdev->host.function); | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static void vfio_disable_intx(VFIODevice *vdev) | |
184 | { | |
185 | int fd; | |
186 | ||
187 | vfio_disable_irqindex(vdev, VFIO_PCI_INTX_IRQ_INDEX); | |
188 | vdev->intx.pending = false; | |
189 | qemu_set_irq(vdev->pdev.irq[vdev->intx.pin], 0); | |
190 | vfio_mmap_set_enabled(vdev, true); | |
191 | ||
192 | fd = event_notifier_get_fd(&vdev->intx.interrupt); | |
193 | qemu_set_fd_handler(fd, NULL, NULL, vdev); | |
194 | event_notifier_cleanup(&vdev->intx.interrupt); | |
195 | ||
196 | vdev->interrupt = VFIO_INT_NONE; | |
197 | ||
198 | DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain, | |
199 | vdev->host.bus, vdev->host.slot, vdev->host.function); | |
200 | } | |
201 | ||
202 | /* | |
203 | * MSI/X | |
204 | */ | |
205 | static void vfio_msi_interrupt(void *opaque) | |
206 | { | |
207 | VFIOMSIVector *vector = opaque; | |
208 | VFIODevice *vdev = vector->vdev; | |
209 | int nr = vector - vdev->msi_vectors; | |
210 | ||
211 | if (!event_notifier_test_and_clear(&vector->interrupt)) { | |
212 | return; | |
213 | } | |
214 | ||
215 | DPRINTF("%s(%04x:%02x:%02x.%x) vector %d\n", __func__, | |
216 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
217 | vdev->host.function, nr); | |
218 | ||
219 | if (vdev->interrupt == VFIO_INT_MSIX) { | |
220 | msix_notify(&vdev->pdev, nr); | |
221 | } else if (vdev->interrupt == VFIO_INT_MSI) { | |
222 | msi_notify(&vdev->pdev, nr); | |
223 | } else { | |
224 | error_report("vfio: MSI interrupt receieved, but not enabled?\n"); | |
225 | } | |
226 | } | |
227 | ||
228 | static int vfio_enable_vectors(VFIODevice *vdev, bool msix) | |
229 | { | |
230 | struct vfio_irq_set *irq_set; | |
231 | int ret = 0, i, argsz; | |
232 | int32_t *fds; | |
233 | ||
234 | argsz = sizeof(*irq_set) + (vdev->nr_vectors * sizeof(*fds)); | |
235 | ||
236 | irq_set = g_malloc0(argsz); | |
237 | irq_set->argsz = argsz; | |
238 | irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER; | |
239 | irq_set->index = msix ? VFIO_PCI_MSIX_IRQ_INDEX : VFIO_PCI_MSI_IRQ_INDEX; | |
240 | irq_set->start = 0; | |
241 | irq_set->count = vdev->nr_vectors; | |
242 | fds = (int32_t *)&irq_set->data; | |
243 | ||
244 | for (i = 0; i < vdev->nr_vectors; i++) { | |
245 | if (!vdev->msi_vectors[i].use) { | |
246 | fds[i] = -1; | |
247 | continue; | |
248 | } | |
249 | ||
250 | fds[i] = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt); | |
251 | } | |
252 | ||
253 | ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set); | |
254 | ||
255 | g_free(irq_set); | |
256 | ||
257 | if (!ret) { | |
258 | vdev->interrupt = msix ? VFIO_INT_MSIX : VFIO_INT_MSI; | |
259 | } | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
264 | static int vfio_msix_vector_use(PCIDevice *pdev, | |
265 | unsigned int nr, MSIMessage msg) | |
266 | { | |
267 | VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); | |
268 | VFIOMSIVector *vector; | |
269 | int ret; | |
270 | ||
271 | DPRINTF("%s(%04x:%02x:%02x.%x) vector %d used\n", __func__, | |
272 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
273 | vdev->host.function, nr); | |
274 | ||
275 | if (vdev->interrupt != VFIO_INT_MSIX) { | |
276 | vfio_disable_interrupts(vdev); | |
277 | } | |
278 | ||
279 | if (!vdev->msi_vectors) { | |
280 | vdev->msi_vectors = g_malloc0(vdev->msix->entries * | |
281 | sizeof(VFIOMSIVector)); | |
282 | } | |
283 | ||
284 | vector = &vdev->msi_vectors[nr]; | |
285 | vector->vdev = vdev; | |
286 | vector->use = true; | |
287 | ||
288 | msix_vector_use(pdev, nr); | |
289 | ||
290 | if (event_notifier_init(&vector->interrupt, 0)) { | |
291 | error_report("vfio: Error: event_notifier_init failed\n"); | |
292 | } | |
293 | ||
294 | /* | |
295 | * Attempt to enable route through KVM irqchip, | |
296 | * default to userspace handling if unavailable. | |
297 | */ | |
298 | vector->virq = kvm_irqchip_add_msi_route(kvm_state, msg); | |
299 | if (vector->virq < 0 || | |
300 | kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt, | |
301 | vector->virq) < 0) { | |
302 | if (vector->virq >= 0) { | |
303 | kvm_irqchip_release_virq(kvm_state, vector->virq); | |
304 | vector->virq = -1; | |
305 | } | |
306 | qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), | |
307 | vfio_msi_interrupt, NULL, vector); | |
308 | } | |
309 | ||
310 | /* | |
311 | * We don't want to have the host allocate all possible MSI vectors | |
312 | * for a device if they're not in use, so we shutdown and incrementally | |
313 | * increase them as needed. | |
314 | */ | |
315 | if (vdev->nr_vectors < nr + 1) { | |
316 | int i; | |
317 | ||
318 | vfio_disable_irqindex(vdev, VFIO_PCI_MSIX_IRQ_INDEX); | |
319 | vdev->nr_vectors = nr + 1; | |
320 | ret = vfio_enable_vectors(vdev, true); | |
321 | if (ret) { | |
322 | error_report("vfio: failed to enable vectors, %d\n", ret); | |
323 | } | |
324 | ||
325 | /* We don't know if we've missed interrupts in the interim... */ | |
326 | for (i = 0; i < vdev->msix->entries; i++) { | |
327 | if (vdev->msi_vectors[i].use) { | |
328 | msix_notify(&vdev->pdev, i); | |
329 | } | |
330 | } | |
331 | } else { | |
332 | VFIOIRQSetFD irq_set_fd = { | |
333 | .irq_set = { | |
334 | .argsz = sizeof(irq_set_fd), | |
335 | .flags = VFIO_IRQ_SET_DATA_EVENTFD | | |
336 | VFIO_IRQ_SET_ACTION_TRIGGER, | |
337 | .index = VFIO_PCI_MSIX_IRQ_INDEX, | |
338 | .start = nr, | |
339 | .count = 1, | |
340 | }, | |
341 | .fd = event_notifier_get_fd(&vector->interrupt), | |
342 | }; | |
343 | ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd); | |
344 | if (ret) { | |
345 | error_report("vfio: failed to modify vector, %d\n", ret); | |
346 | } | |
347 | ||
348 | /* | |
349 | * If we were connected to the hardware PBA we could skip this, | |
350 | * until then, a spurious interrupt is better than starvation. | |
351 | */ | |
352 | msix_notify(&vdev->pdev, nr); | |
353 | } | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int nr) | |
359 | { | |
360 | VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); | |
361 | VFIOMSIVector *vector = &vdev->msi_vectors[nr]; | |
362 | VFIOIRQSetFD irq_set_fd = { | |
363 | .irq_set = { | |
364 | .argsz = sizeof(irq_set_fd), | |
365 | .flags = VFIO_IRQ_SET_DATA_EVENTFD | | |
366 | VFIO_IRQ_SET_ACTION_TRIGGER, | |
367 | .index = VFIO_PCI_MSIX_IRQ_INDEX, | |
368 | .start = nr, | |
369 | .count = 1, | |
370 | }, | |
371 | .fd = -1, | |
372 | }; | |
373 | ||
374 | DPRINTF("%s(%04x:%02x:%02x.%x) vector %d released\n", __func__, | |
375 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
376 | vdev->host.function, nr); | |
377 | ||
378 | /* | |
379 | * XXX What's the right thing to do here? This turns off the interrupt | |
380 | * completely, but do we really just want to switch the interrupt to | |
381 | * bouncing through userspace and let msix.c drop it? Not sure. | |
382 | */ | |
383 | msix_vector_unuse(pdev, nr); | |
384 | ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set_fd); | |
385 | ||
386 | if (vector->virq < 0) { | |
387 | qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), | |
388 | NULL, NULL, NULL); | |
389 | } else { | |
390 | kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt, | |
391 | vector->virq); | |
392 | kvm_irqchip_release_virq(kvm_state, vector->virq); | |
393 | vector->virq = -1; | |
394 | } | |
395 | ||
396 | event_notifier_cleanup(&vector->interrupt); | |
397 | vector->use = false; | |
398 | } | |
399 | ||
400 | /* TODO This should move to msi.c */ | |
401 | static MSIMessage msi_get_msg(PCIDevice *pdev, unsigned int vector) | |
402 | { | |
403 | uint16_t flags = pci_get_word(pdev->config + pdev->msi_cap + PCI_MSI_FLAGS); | |
404 | bool msi64bit = flags & PCI_MSI_FLAGS_64BIT; | |
405 | MSIMessage msg; | |
406 | ||
407 | if (msi64bit) { | |
408 | msg.address = pci_get_quad(pdev->config + | |
409 | pdev->msi_cap + PCI_MSI_ADDRESS_LO); | |
410 | } else { | |
411 | msg.address = pci_get_long(pdev->config + | |
412 | pdev->msi_cap + PCI_MSI_ADDRESS_LO); | |
413 | } | |
414 | ||
415 | msg.data = pci_get_word(pdev->config + pdev->msi_cap + | |
416 | (msi64bit ? PCI_MSI_DATA_64 : PCI_MSI_DATA_32)); | |
417 | msg.data += vector; | |
418 | ||
419 | return msg; | |
420 | } | |
421 | ||
422 | /* So should this */ | |
423 | static void msi_set_qsize(PCIDevice *pdev, uint8_t size) | |
424 | { | |
425 | uint8_t *config = pdev->config + pdev->msi_cap; | |
426 | uint16_t flags; | |
427 | ||
428 | flags = pci_get_word(config + PCI_MSI_FLAGS); | |
429 | flags = le16_to_cpu(flags); | |
430 | flags &= ~PCI_MSI_FLAGS_QSIZE; | |
431 | flags |= (size & 0x7) << 4; | |
432 | flags = cpu_to_le16(flags); | |
433 | pci_set_word(config + PCI_MSI_FLAGS, flags); | |
434 | } | |
435 | ||
436 | static void vfio_enable_msi(VFIODevice *vdev) | |
437 | { | |
438 | int ret, i; | |
439 | ||
440 | vfio_disable_interrupts(vdev); | |
441 | ||
442 | vdev->nr_vectors = msi_nr_vectors_allocated(&vdev->pdev); | |
443 | retry: | |
444 | vdev->msi_vectors = g_malloc0(vdev->nr_vectors * sizeof(VFIOMSIVector)); | |
445 | ||
446 | for (i = 0; i < vdev->nr_vectors; i++) { | |
447 | MSIMessage msg; | |
448 | VFIOMSIVector *vector = &vdev->msi_vectors[i]; | |
449 | ||
450 | vector->vdev = vdev; | |
451 | vector->use = true; | |
452 | ||
453 | if (event_notifier_init(&vector->interrupt, 0)) { | |
454 | error_report("vfio: Error: event_notifier_init failed\n"); | |
455 | } | |
456 | ||
457 | msg = msi_get_msg(&vdev->pdev, i); | |
458 | ||
459 | /* | |
460 | * Attempt to enable route through KVM irqchip, | |
461 | * default to userspace handling if unavailable. | |
462 | */ | |
463 | vector->virq = kvm_irqchip_add_msi_route(kvm_state, msg); | |
464 | if (vector->virq < 0 || | |
465 | kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt, | |
466 | vector->virq) < 0) { | |
467 | qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), | |
468 | vfio_msi_interrupt, NULL, vector); | |
469 | } | |
470 | } | |
471 | ||
472 | ret = vfio_enable_vectors(vdev, false); | |
473 | if (ret) { | |
474 | if (ret < 0) { | |
475 | error_report("vfio: Error: Failed to setup MSI fds: %m\n"); | |
476 | } else if (ret != vdev->nr_vectors) { | |
477 | error_report("vfio: Error: Failed to enable %d " | |
478 | "MSI vectors, retry with %d\n", vdev->nr_vectors, ret); | |
479 | } | |
480 | ||
481 | for (i = 0; i < vdev->nr_vectors; i++) { | |
482 | VFIOMSIVector *vector = &vdev->msi_vectors[i]; | |
483 | if (vector->virq >= 0) { | |
484 | kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt, | |
485 | vector->virq); | |
486 | kvm_irqchip_release_virq(kvm_state, vector->virq); | |
487 | vector->virq = -1; | |
488 | } else { | |
489 | qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), | |
490 | NULL, NULL, NULL); | |
491 | } | |
492 | event_notifier_cleanup(&vector->interrupt); | |
493 | } | |
494 | ||
495 | g_free(vdev->msi_vectors); | |
496 | ||
497 | if (ret > 0 && ret != vdev->nr_vectors) { | |
498 | vdev->nr_vectors = ret; | |
499 | goto retry; | |
500 | } | |
501 | vdev->nr_vectors = 0; | |
502 | ||
503 | return; | |
504 | } | |
505 | ||
506 | msi_set_qsize(&vdev->pdev, vdev->nr_vectors); | |
507 | ||
508 | DPRINTF("%s(%04x:%02x:%02x.%x) Enabled %d MSI vectors\n", __func__, | |
509 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
510 | vdev->host.function, vdev->nr_vectors); | |
511 | } | |
512 | ||
513 | static void vfio_disable_msi_x(VFIODevice *vdev, bool msix) | |
514 | { | |
515 | int i; | |
516 | ||
517 | vfio_disable_irqindex(vdev, msix ? VFIO_PCI_MSIX_IRQ_INDEX : | |
518 | VFIO_PCI_MSI_IRQ_INDEX); | |
519 | ||
520 | for (i = 0; i < vdev->nr_vectors; i++) { | |
521 | VFIOMSIVector *vector = &vdev->msi_vectors[i]; | |
522 | ||
523 | if (!vector->use) { | |
524 | continue; | |
525 | } | |
526 | ||
527 | if (vector->virq >= 0) { | |
528 | kvm_irqchip_remove_irqfd_notifier(kvm_state, | |
529 | &vector->interrupt, vector->virq); | |
530 | kvm_irqchip_release_virq(kvm_state, vector->virq); | |
531 | vector->virq = -1; | |
532 | } else { | |
533 | qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt), | |
534 | NULL, NULL, NULL); | |
535 | } | |
536 | ||
537 | if (msix) { | |
538 | msix_vector_unuse(&vdev->pdev, i); | |
539 | } | |
540 | ||
541 | event_notifier_cleanup(&vector->interrupt); | |
542 | } | |
543 | ||
544 | g_free(vdev->msi_vectors); | |
545 | vdev->msi_vectors = NULL; | |
546 | vdev->nr_vectors = 0; | |
547 | ||
548 | if (!msix) { | |
549 | msi_set_qsize(&vdev->pdev, 0); /* Actually still means 1 vector */ | |
550 | } | |
551 | ||
552 | DPRINTF("%s(%04x:%02x:%02x.%x, msi%s)\n", __func__, | |
553 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
554 | vdev->host.function, msix ? "x" : ""); | |
555 | ||
556 | vfio_enable_intx(vdev); | |
557 | } | |
558 | ||
559 | /* | |
560 | * IO Port/MMIO - Beware of the endians, VFIO is always little endian | |
561 | */ | |
562 | static void vfio_bar_write(void *opaque, target_phys_addr_t addr, | |
563 | uint64_t data, unsigned size) | |
564 | { | |
565 | VFIOBAR *bar = opaque; | |
566 | union { | |
567 | uint8_t byte; | |
568 | uint16_t word; | |
569 | uint32_t dword; | |
570 | uint64_t qword; | |
571 | } buf; | |
572 | ||
573 | switch (size) { | |
574 | case 1: | |
575 | buf.byte = data; | |
576 | break; | |
577 | case 2: | |
578 | buf.word = cpu_to_le16(data); | |
579 | break; | |
580 | case 4: | |
581 | buf.dword = cpu_to_le32(data); | |
582 | break; | |
583 | default: | |
584 | hw_error("vfio: unsupported write size, %d bytes\n", size); | |
585 | break; | |
586 | } | |
587 | ||
588 | if (pwrite(bar->fd, &buf, size, bar->fd_offset + addr) != size) { | |
589 | error_report("%s(,0x%"TARGET_PRIxPHYS", 0x%"PRIx64", %d) failed: %m\n", | |
590 | __func__, addr, data, size); | |
591 | } | |
592 | ||
593 | DPRINTF("%s(BAR%d+0x%"TARGET_PRIxPHYS", 0x%"PRIx64", %d)\n", | |
594 | __func__, bar->nr, addr, data, size); | |
595 | ||
596 | /* | |
597 | * A read or write to a BAR always signals an INTx EOI. This will | |
598 | * do nothing if not pending (including not in INTx mode). We assume | |
599 | * that a BAR access is in response to an interrupt and that BAR | |
600 | * accesses will service the interrupt. Unfortunately, we don't know | |
601 | * which access will service the interrupt, so we're potentially | |
602 | * getting quite a few host interrupts per guest interrupt. | |
603 | */ | |
604 | vfio_eoi(DO_UPCAST(VFIODevice, bars[bar->nr], bar)); | |
605 | } | |
606 | ||
607 | static uint64_t vfio_bar_read(void *opaque, | |
608 | target_phys_addr_t addr, unsigned size) | |
609 | { | |
610 | VFIOBAR *bar = opaque; | |
611 | union { | |
612 | uint8_t byte; | |
613 | uint16_t word; | |
614 | uint32_t dword; | |
615 | uint64_t qword; | |
616 | } buf; | |
617 | uint64_t data = 0; | |
618 | ||
619 | if (pread(bar->fd, &buf, size, bar->fd_offset + addr) != size) { | |
620 | error_report("%s(,0x%"TARGET_PRIxPHYS", %d) failed: %m\n", | |
621 | __func__, addr, size); | |
622 | return (uint64_t)-1; | |
623 | } | |
624 | ||
625 | switch (size) { | |
626 | case 1: | |
627 | data = buf.byte; | |
628 | break; | |
629 | case 2: | |
630 | data = le16_to_cpu(buf.word); | |
631 | break; | |
632 | case 4: | |
633 | data = le32_to_cpu(buf.dword); | |
634 | break; | |
635 | default: | |
636 | hw_error("vfio: unsupported read size, %d bytes\n", size); | |
637 | break; | |
638 | } | |
639 | ||
640 | DPRINTF("%s(BAR%d+0x%"TARGET_PRIxPHYS", %d) = 0x%"PRIx64"\n", | |
641 | __func__, bar->nr, addr, size, data); | |
642 | ||
643 | /* Same as write above */ | |
644 | vfio_eoi(DO_UPCAST(VFIODevice, bars[bar->nr], bar)); | |
645 | ||
646 | return data; | |
647 | } | |
648 | ||
649 | static const MemoryRegionOps vfio_bar_ops = { | |
650 | .read = vfio_bar_read, | |
651 | .write = vfio_bar_write, | |
652 | .endianness = DEVICE_LITTLE_ENDIAN, | |
653 | }; | |
654 | ||
655 | /* | |
656 | * PCI config space | |
657 | */ | |
658 | static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len) | |
659 | { | |
660 | VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); | |
661 | uint32_t val = 0; | |
662 | ||
663 | /* | |
664 | * We only need QEMU PCI config support for the ROM BAR, the MSI and MSIX | |
665 | * capabilities, and the multifunction bit below. We let VFIO handle | |
666 | * virtualizing everything else. Performance is not a concern here. | |
667 | */ | |
668 | if (ranges_overlap(addr, len, PCI_ROM_ADDRESS, 4) || | |
669 | (pdev->cap_present & QEMU_PCI_CAP_MSIX && | |
670 | ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) || | |
671 | (pdev->cap_present & QEMU_PCI_CAP_MSI && | |
672 | ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size))) { | |
673 | ||
674 | val = pci_default_read_config(pdev, addr, len); | |
675 | } else { | |
676 | if (pread(vdev->fd, &val, len, vdev->config_offset + addr) != len) { | |
677 | error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x) failed: %m\n", | |
678 | __func__, vdev->host.domain, vdev->host.bus, | |
679 | vdev->host.slot, vdev->host.function, addr, len); | |
680 | return -errno; | |
681 | } | |
682 | val = le32_to_cpu(val); | |
683 | } | |
684 | ||
685 | /* Multifunction bit is virualized in QEMU */ | |
686 | if (unlikely(ranges_overlap(addr, len, PCI_HEADER_TYPE, 1))) { | |
687 | uint32_t mask = PCI_HEADER_TYPE_MULTI_FUNCTION; | |
688 | ||
689 | if (len == 4) { | |
690 | mask <<= 16; | |
691 | } | |
692 | ||
693 | if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) { | |
694 | val |= mask; | |
695 | } else { | |
696 | val &= ~mask; | |
697 | } | |
698 | } | |
699 | ||
700 | DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %x\n", __func__, | |
701 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
702 | vdev->host.function, addr, len, val); | |
703 | ||
704 | return val; | |
705 | } | |
706 | ||
707 | static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr, | |
708 | uint32_t val, int len) | |
709 | { | |
710 | VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); | |
711 | uint32_t val_le = cpu_to_le32(val); | |
712 | ||
713 | DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, 0x%x, len=0x%x)\n", __func__, | |
714 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
715 | vdev->host.function, addr, val, len); | |
716 | ||
717 | /* Write everything to VFIO, let it filter out what we can't write */ | |
718 | if (pwrite(vdev->fd, &val_le, len, vdev->config_offset + addr) != len) { | |
719 | error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x, 0x%x) failed: %m\n", | |
720 | __func__, vdev->host.domain, vdev->host.bus, | |
721 | vdev->host.slot, vdev->host.function, addr, val, len); | |
722 | } | |
723 | ||
724 | /* Write standard header bits to emulation */ | |
725 | if (addr < PCI_CONFIG_HEADER_SIZE) { | |
726 | pci_default_write_config(pdev, addr, val, len); | |
727 | return; | |
728 | } | |
729 | ||
730 | /* MSI/MSI-X Enabling/Disabling */ | |
731 | if (pdev->cap_present & QEMU_PCI_CAP_MSI && | |
732 | ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size)) { | |
733 | int is_enabled, was_enabled = msi_enabled(pdev); | |
734 | ||
735 | pci_default_write_config(pdev, addr, val, len); | |
736 | ||
737 | is_enabled = msi_enabled(pdev); | |
738 | ||
739 | if (!was_enabled && is_enabled) { | |
740 | vfio_enable_msi(vdev); | |
741 | } else if (was_enabled && !is_enabled) { | |
742 | vfio_disable_msi_x(vdev, false); | |
743 | } | |
744 | } | |
745 | ||
746 | if (pdev->cap_present & QEMU_PCI_CAP_MSIX && | |
747 | ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) { | |
748 | int is_enabled, was_enabled = msix_enabled(pdev); | |
749 | ||
750 | pci_default_write_config(pdev, addr, val, len); | |
751 | ||
752 | is_enabled = msix_enabled(pdev); | |
753 | ||
754 | if (!was_enabled && is_enabled) { | |
755 | /* vfio_msix_vector_use handles this automatically */ | |
756 | } else if (was_enabled && !is_enabled) { | |
757 | vfio_disable_msi_x(vdev, true); | |
758 | } | |
759 | } | |
760 | } | |
761 | ||
762 | /* | |
763 | * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 | |
764 | */ | |
765 | static int vfio_dma_map(VFIOContainer *container, target_phys_addr_t iova, | |
766 | ram_addr_t size, void *vaddr, bool readonly) | |
767 | { | |
768 | struct vfio_iommu_type1_dma_map map = { | |
769 | .argsz = sizeof(map), | |
770 | .flags = VFIO_DMA_MAP_FLAG_READ, | |
771 | .vaddr = (__u64)vaddr, | |
772 | .iova = iova, | |
773 | .size = size, | |
774 | }; | |
775 | ||
776 | if (!readonly) { | |
777 | map.flags |= VFIO_DMA_MAP_FLAG_WRITE; | |
778 | } | |
779 | ||
780 | if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map)) { | |
781 | DPRINTF("VFIO_MAP_DMA: %d\n", -errno); | |
782 | return -errno; | |
783 | } | |
784 | ||
785 | return 0; | |
786 | } | |
787 | ||
788 | static int vfio_dma_unmap(VFIOContainer *container, | |
789 | target_phys_addr_t iova, ram_addr_t size) | |
790 | { | |
791 | struct vfio_iommu_type1_dma_unmap unmap = { | |
792 | .argsz = sizeof(unmap), | |
793 | .flags = 0, | |
794 | .iova = iova, | |
795 | .size = size, | |
796 | }; | |
797 | ||
798 | if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { | |
799 | DPRINTF("VFIO_UNMAP_DMA: %d\n", -errno); | |
800 | return -errno; | |
801 | } | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
806 | static void vfio_listener_dummy1(MemoryListener *listener) | |
807 | { | |
808 | /* We don't do batching (begin/commit) or care about logging */ | |
809 | } | |
810 | ||
811 | static void vfio_listener_dummy2(MemoryListener *listener, | |
812 | MemoryRegionSection *section) | |
813 | { | |
814 | /* We don't do logging or care about nops */ | |
815 | } | |
816 | ||
817 | static void vfio_listener_dummy3(MemoryListener *listener, | |
818 | MemoryRegionSection *section, | |
819 | bool match_data, uint64_t data, | |
820 | EventNotifier *e) | |
821 | { | |
822 | /* We don't care about eventfds */ | |
823 | } | |
824 | ||
825 | static bool vfio_listener_skipped_section(MemoryRegionSection *section) | |
826 | { | |
827 | return !memory_region_is_ram(section->mr); | |
828 | } | |
829 | ||
830 | static void vfio_listener_region_add(MemoryListener *listener, | |
831 | MemoryRegionSection *section) | |
832 | { | |
833 | VFIOContainer *container = container_of(listener, VFIOContainer, | |
834 | iommu_data.listener); | |
835 | target_phys_addr_t iova, end; | |
836 | void *vaddr; | |
837 | int ret; | |
838 | ||
839 | if (vfio_listener_skipped_section(section)) { | |
840 | DPRINTF("vfio: SKIPPING region_add %"TARGET_PRIxPHYS" - %"PRIx64"\n", | |
841 | section->offset_within_address_space, | |
842 | section->offset_within_address_space + section->size - 1); | |
843 | return; | |
844 | } | |
845 | ||
846 | if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != | |
847 | (section->offset_within_region & ~TARGET_PAGE_MASK))) { | |
848 | error_report("%s received unaligned region\n", __func__); | |
849 | return; | |
850 | } | |
851 | ||
852 | iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); | |
853 | end = (section->offset_within_address_space + section->size) & | |
854 | TARGET_PAGE_MASK; | |
855 | ||
856 | if (iova >= end) { | |
857 | return; | |
858 | } | |
859 | ||
860 | vaddr = memory_region_get_ram_ptr(section->mr) + | |
861 | section->offset_within_region + | |
862 | (iova - section->offset_within_address_space); | |
863 | ||
864 | DPRINTF("vfio: region_add %"TARGET_PRIxPHYS" - %"TARGET_PRIxPHYS" [%p]\n", | |
865 | iova, end - 1, vaddr); | |
866 | ||
867 | ret = vfio_dma_map(container, iova, end - iova, vaddr, section->readonly); | |
868 | if (ret) { | |
869 | error_report("vfio_dma_map(%p, 0x%"TARGET_PRIxPHYS", " | |
870 | "0x%"TARGET_PRIxPHYS", %p) = %d (%m)\n", | |
871 | container, iova, end - iova, vaddr, ret); | |
872 | } | |
873 | } | |
874 | ||
875 | static void vfio_listener_region_del(MemoryListener *listener, | |
876 | MemoryRegionSection *section) | |
877 | { | |
878 | VFIOContainer *container = container_of(listener, VFIOContainer, | |
879 | iommu_data.listener); | |
880 | target_phys_addr_t iova, end; | |
881 | int ret; | |
882 | ||
883 | if (vfio_listener_skipped_section(section)) { | |
884 | DPRINTF("vfio: SKIPPING region_del %"TARGET_PRIxPHYS" - %"PRIx64"\n", | |
885 | section->offset_within_address_space, | |
886 | section->offset_within_address_space + section->size - 1); | |
887 | return; | |
888 | } | |
889 | ||
890 | if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) != | |
891 | (section->offset_within_region & ~TARGET_PAGE_MASK))) { | |
892 | error_report("%s received unaligned region\n", __func__); | |
893 | return; | |
894 | } | |
895 | ||
896 | iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); | |
897 | end = (section->offset_within_address_space + section->size) & | |
898 | TARGET_PAGE_MASK; | |
899 | ||
900 | if (iova >= end) { | |
901 | return; | |
902 | } | |
903 | ||
904 | DPRINTF("vfio: region_del %"TARGET_PRIxPHYS" - %"TARGET_PRIxPHYS"\n", | |
905 | iova, end - 1); | |
906 | ||
907 | ret = vfio_dma_unmap(container, iova, end - iova); | |
908 | if (ret) { | |
909 | error_report("vfio_dma_unmap(%p, 0x%"TARGET_PRIxPHYS", " | |
910 | "0x%"TARGET_PRIxPHYS") = %d (%m)\n", | |
911 | container, iova, end - iova, ret); | |
912 | } | |
913 | } | |
914 | ||
915 | static MemoryListener vfio_memory_listener = { | |
916 | .begin = vfio_listener_dummy1, | |
917 | .commit = vfio_listener_dummy1, | |
918 | .region_add = vfio_listener_region_add, | |
919 | .region_del = vfio_listener_region_del, | |
920 | .region_nop = vfio_listener_dummy2, | |
921 | .log_start = vfio_listener_dummy2, | |
922 | .log_stop = vfio_listener_dummy2, | |
923 | .log_sync = vfio_listener_dummy2, | |
924 | .log_global_start = vfio_listener_dummy1, | |
925 | .log_global_stop = vfio_listener_dummy1, | |
926 | .eventfd_add = vfio_listener_dummy3, | |
927 | .eventfd_del = vfio_listener_dummy3, | |
928 | }; | |
929 | ||
930 | static void vfio_listener_release(VFIOContainer *container) | |
931 | { | |
932 | memory_listener_unregister(&container->iommu_data.listener); | |
933 | } | |
934 | ||
935 | /* | |
936 | * Interrupt setup | |
937 | */ | |
938 | static void vfio_disable_interrupts(VFIODevice *vdev) | |
939 | { | |
940 | switch (vdev->interrupt) { | |
941 | case VFIO_INT_INTx: | |
942 | vfio_disable_intx(vdev); | |
943 | break; | |
944 | case VFIO_INT_MSI: | |
945 | vfio_disable_msi_x(vdev, false); | |
946 | break; | |
947 | case VFIO_INT_MSIX: | |
948 | vfio_disable_msi_x(vdev, true); | |
949 | break; | |
950 | } | |
951 | } | |
952 | ||
953 | static int vfio_setup_msi(VFIODevice *vdev, int pos) | |
954 | { | |
955 | uint16_t ctrl; | |
956 | bool msi_64bit, msi_maskbit; | |
957 | int ret, entries; | |
958 | ||
959 | /* | |
960 | * TODO: don't peek into msi_supported, let msi_init fail and | |
961 | * check for ENOTSUP | |
962 | */ | |
963 | if (!msi_supported) { | |
964 | return 0; | |
965 | } | |
966 | ||
967 | if (pread(vdev->fd, &ctrl, sizeof(ctrl), | |
968 | vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) { | |
969 | return -errno; | |
970 | } | |
971 | ctrl = le16_to_cpu(ctrl); | |
972 | ||
973 | msi_64bit = !!(ctrl & PCI_MSI_FLAGS_64BIT); | |
974 | msi_maskbit = !!(ctrl & PCI_MSI_FLAGS_MASKBIT); | |
975 | entries = 1 << ((ctrl & PCI_MSI_FLAGS_QMASK) >> 1); | |
976 | ||
977 | DPRINTF("%04x:%02x:%02x.%x PCI MSI CAP @0x%x\n", vdev->host.domain, | |
978 | vdev->host.bus, vdev->host.slot, vdev->host.function, pos); | |
979 | ||
980 | ret = msi_init(&vdev->pdev, pos, entries, msi_64bit, msi_maskbit); | |
981 | if (ret < 0) { | |
982 | error_report("vfio: msi_init failed\n"); | |
983 | return ret; | |
984 | } | |
985 | vdev->msi_cap_size = 0xa + (msi_maskbit ? 0xa : 0) + (msi_64bit ? 0x4 : 0); | |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
990 | /* | |
991 | * We don't have any control over how pci_add_capability() inserts | |
992 | * capabilities into the chain. In order to setup MSI-X we need a | |
993 | * MemoryRegion for the BAR. In order to setup the BAR and not | |
994 | * attempt to mmap the MSI-X table area, which VFIO won't allow, we | |
995 | * need to first look for where the MSI-X table lives. So we | |
996 | * unfortunately split MSI-X setup across two functions. | |
997 | */ | |
998 | static int vfio_early_setup_msix(VFIODevice *vdev) | |
999 | { | |
1000 | uint8_t pos; | |
1001 | uint16_t ctrl; | |
1002 | uint32_t table, pba; | |
1003 | ||
1004 | pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX); | |
1005 | if (!pos) { | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | if (pread(vdev->fd, &ctrl, sizeof(ctrl), | |
1010 | vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) { | |
1011 | return -errno; | |
1012 | } | |
1013 | ||
1014 | if (pread(vdev->fd, &table, sizeof(table), | |
1015 | vdev->config_offset + pos + PCI_MSIX_TABLE) != sizeof(table)) { | |
1016 | return -errno; | |
1017 | } | |
1018 | ||
1019 | if (pread(vdev->fd, &pba, sizeof(pba), | |
1020 | vdev->config_offset + pos + PCI_MSIX_PBA) != sizeof(pba)) { | |
1021 | return -errno; | |
1022 | } | |
1023 | ||
1024 | ctrl = le16_to_cpu(ctrl); | |
1025 | table = le32_to_cpu(table); | |
1026 | pba = le32_to_cpu(pba); | |
1027 | ||
1028 | vdev->msix = g_malloc0(sizeof(*(vdev->msix))); | |
1029 | vdev->msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK; | |
1030 | vdev->msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK; | |
1031 | vdev->msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK; | |
1032 | vdev->msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK; | |
1033 | vdev->msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1; | |
1034 | ||
1035 | DPRINTF("%04x:%02x:%02x.%x " | |
1036 | "PCI MSI-X CAP @0x%x, BAR %d, offset 0x%x, entries %d\n", | |
1037 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
1038 | vdev->host.function, pos, vdev->msix->table_bar, | |
1039 | vdev->msix->table_offset, vdev->msix->entries); | |
1040 | ||
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static int vfio_setup_msix(VFIODevice *vdev, int pos) | |
1045 | { | |
1046 | int ret; | |
1047 | ||
1048 | /* | |
1049 | * TODO: don't peek into msi_supported, let msix_init fail and | |
1050 | * check for ENOTSUP | |
1051 | */ | |
1052 | if (!msi_supported) { | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | ret = msix_init(&vdev->pdev, vdev->msix->entries, | |
1057 | &vdev->bars[vdev->msix->table_bar].mem, | |
1058 | vdev->msix->table_bar, vdev->msix->table_offset, | |
1059 | &vdev->bars[vdev->msix->pba_bar].mem, | |
1060 | vdev->msix->pba_bar, vdev->msix->pba_offset, pos); | |
1061 | if (ret < 0) { | |
1062 | error_report("vfio: msix_init failed\n"); | |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | ret = msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use, | |
1067 | vfio_msix_vector_release); | |
1068 | if (ret) { | |
1069 | error_report("vfio: msix_set_vector_notifiers failed %d\n", ret); | |
1070 | msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem, | |
1071 | &vdev->bars[vdev->msix->pba_bar].mem); | |
1072 | return ret; | |
1073 | } | |
1074 | ||
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | static void vfio_teardown_msi(VFIODevice *vdev) | |
1079 | { | |
1080 | msi_uninit(&vdev->pdev); | |
1081 | ||
1082 | if (vdev->msix) { | |
1083 | /* FIXME: Why can't unset just silently do nothing?? */ | |
1084 | if (vdev->pdev.msix_vector_use_notifier && | |
1085 | vdev->pdev.msix_vector_release_notifier) { | |
1086 | msix_unset_vector_notifiers(&vdev->pdev); | |
1087 | } | |
1088 | ||
1089 | msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem, | |
1090 | &vdev->bars[vdev->msix->pba_bar].mem); | |
1091 | } | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * Resource setup | |
1096 | */ | |
1097 | static void vfio_mmap_set_enabled(VFIODevice *vdev, bool enabled) | |
1098 | { | |
1099 | int i; | |
1100 | ||
1101 | for (i = 0; i < PCI_ROM_SLOT; i++) { | |
1102 | VFIOBAR *bar = &vdev->bars[i]; | |
1103 | ||
1104 | if (!bar->size) { | |
1105 | continue; | |
1106 | } | |
1107 | ||
1108 | memory_region_set_enabled(&bar->mmap_mem, enabled); | |
1109 | if (vdev->msix && vdev->msix->table_bar == i) { | |
1110 | memory_region_set_enabled(&vdev->msix->mmap_mem, enabled); | |
1111 | } | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | static void vfio_unmap_bar(VFIODevice *vdev, int nr) | |
1116 | { | |
1117 | VFIOBAR *bar = &vdev->bars[nr]; | |
1118 | ||
1119 | if (!bar->size) { | |
1120 | return; | |
1121 | } | |
1122 | ||
1123 | memory_region_del_subregion(&bar->mem, &bar->mmap_mem); | |
1124 | munmap(bar->mmap, memory_region_size(&bar->mmap_mem)); | |
1125 | ||
1126 | if (vdev->msix && vdev->msix->table_bar == nr) { | |
1127 | memory_region_del_subregion(&bar->mem, &vdev->msix->mmap_mem); | |
1128 | munmap(vdev->msix->mmap, memory_region_size(&vdev->msix->mmap_mem)); | |
1129 | } | |
1130 | ||
1131 | memory_region_destroy(&bar->mem); | |
1132 | } | |
1133 | ||
1134 | static int vfio_mmap_bar(VFIOBAR *bar, MemoryRegion *mem, MemoryRegion *submem, | |
1135 | void **map, size_t size, off_t offset, | |
1136 | const char *name) | |
1137 | { | |
1138 | int ret = 0; | |
1139 | ||
1140 | if (size && bar->flags & VFIO_REGION_INFO_FLAG_MMAP) { | |
1141 | int prot = 0; | |
1142 | ||
1143 | if (bar->flags & VFIO_REGION_INFO_FLAG_READ) { | |
1144 | prot |= PROT_READ; | |
1145 | } | |
1146 | ||
1147 | if (bar->flags & VFIO_REGION_INFO_FLAG_WRITE) { | |
1148 | prot |= PROT_WRITE; | |
1149 | } | |
1150 | ||
1151 | *map = mmap(NULL, size, prot, MAP_SHARED, | |
1152 | bar->fd, bar->fd_offset + offset); | |
1153 | if (*map == MAP_FAILED) { | |
1154 | *map = NULL; | |
1155 | ret = -errno; | |
1156 | goto empty_region; | |
1157 | } | |
1158 | ||
1159 | memory_region_init_ram_ptr(submem, name, size, *map); | |
1160 | } else { | |
1161 | empty_region: | |
1162 | /* Create a zero sized sub-region to make cleanup easy. */ | |
1163 | memory_region_init(submem, name, 0); | |
1164 | } | |
1165 | ||
1166 | memory_region_add_subregion(mem, offset, submem); | |
1167 | ||
1168 | return ret; | |
1169 | } | |
1170 | ||
1171 | static void vfio_map_bar(VFIODevice *vdev, int nr) | |
1172 | { | |
1173 | VFIOBAR *bar = &vdev->bars[nr]; | |
1174 | unsigned size = bar->size; | |
1175 | char name[64]; | |
1176 | uint32_t pci_bar; | |
1177 | uint8_t type; | |
1178 | int ret; | |
1179 | ||
1180 | /* Skip both unimplemented BARs and the upper half of 64bit BARS. */ | |
1181 | if (!size) { | |
1182 | return; | |
1183 | } | |
1184 | ||
1185 | snprintf(name, sizeof(name), "VFIO %04x:%02x:%02x.%x BAR %d", | |
1186 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
1187 | vdev->host.function, nr); | |
1188 | ||
1189 | /* Determine what type of BAR this is for registration */ | |
1190 | ret = pread(vdev->fd, &pci_bar, sizeof(pci_bar), | |
1191 | vdev->config_offset + PCI_BASE_ADDRESS_0 + (4 * nr)); | |
1192 | if (ret != sizeof(pci_bar)) { | |
1193 | error_report("vfio: Failed to read BAR %d (%m)\n", nr); | |
1194 | return; | |
1195 | } | |
1196 | ||
1197 | pci_bar = le32_to_cpu(pci_bar); | |
1198 | type = pci_bar & (pci_bar & PCI_BASE_ADDRESS_SPACE_IO ? | |
1199 | ~PCI_BASE_ADDRESS_IO_MASK : ~PCI_BASE_ADDRESS_MEM_MASK); | |
1200 | ||
1201 | /* A "slow" read/write mapping underlies all BARs */ | |
1202 | memory_region_init_io(&bar->mem, &vfio_bar_ops, bar, name, size); | |
1203 | pci_register_bar(&vdev->pdev, nr, type, &bar->mem); | |
1204 | ||
1205 | /* | |
1206 | * We can't mmap areas overlapping the MSIX vector table, so we | |
1207 | * potentially insert a direct-mapped subregion before and after it. | |
1208 | */ | |
1209 | if (vdev->msix && vdev->msix->table_bar == nr) { | |
1210 | size = vdev->msix->table_offset & TARGET_PAGE_MASK; | |
1211 | } | |
1212 | ||
1213 | strncat(name, " mmap", sizeof(name) - strlen(name) - 1); | |
1214 | if (vfio_mmap_bar(bar, &bar->mem, | |
1215 | &bar->mmap_mem, &bar->mmap, size, 0, name)) { | |
1216 | error_report("%s unsupported. Performance may be slow\n", name); | |
1217 | } | |
1218 | ||
1219 | if (vdev->msix && vdev->msix->table_bar == nr) { | |
1220 | unsigned start; | |
1221 | ||
1222 | start = TARGET_PAGE_ALIGN(vdev->msix->table_offset + | |
1223 | (vdev->msix->entries * PCI_MSIX_ENTRY_SIZE)); | |
1224 | ||
1225 | size = start < bar->size ? bar->size - start : 0; | |
1226 | strncat(name, " msix-hi", sizeof(name) - strlen(name) - 1); | |
1227 | /* VFIOMSIXInfo contains another MemoryRegion for this mapping */ | |
1228 | if (vfio_mmap_bar(bar, &bar->mem, &vdev->msix->mmap_mem, | |
1229 | &vdev->msix->mmap, size, start, name)) { | |
1230 | error_report("%s unsupported. Performance may be slow\n", name); | |
1231 | } | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | static void vfio_map_bars(VFIODevice *vdev) | |
1236 | { | |
1237 | int i; | |
1238 | ||
1239 | for (i = 0; i < PCI_ROM_SLOT; i++) { | |
1240 | vfio_map_bar(vdev, i); | |
1241 | } | |
1242 | } | |
1243 | ||
1244 | static void vfio_unmap_bars(VFIODevice *vdev) | |
1245 | { | |
1246 | int i; | |
1247 | ||
1248 | for (i = 0; i < PCI_ROM_SLOT; i++) { | |
1249 | vfio_unmap_bar(vdev, i); | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | /* | |
1254 | * General setup | |
1255 | */ | |
1256 | static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos) | |
1257 | { | |
1258 | uint8_t tmp, next = 0xff; | |
1259 | ||
1260 | for (tmp = pdev->config[PCI_CAPABILITY_LIST]; tmp; | |
1261 | tmp = pdev->config[tmp + 1]) { | |
1262 | if (tmp > pos && tmp < next) { | |
1263 | next = tmp; | |
1264 | } | |
1265 | } | |
1266 | ||
1267 | return next - pos; | |
1268 | } | |
1269 | ||
1270 | static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos) | |
1271 | { | |
1272 | PCIDevice *pdev = &vdev->pdev; | |
1273 | uint8_t cap_id, next, size; | |
1274 | int ret; | |
1275 | ||
1276 | cap_id = pdev->config[pos]; | |
1277 | next = pdev->config[pos + 1]; | |
1278 | ||
1279 | /* | |
1280 | * If it becomes important to configure capabilities to their actual | |
1281 | * size, use this as the default when it's something we don't recognize. | |
1282 | * Since QEMU doesn't actually handle many of the config accesses, | |
1283 | * exact size doesn't seem worthwhile. | |
1284 | */ | |
1285 | size = vfio_std_cap_max_size(pdev, pos); | |
1286 | ||
1287 | /* | |
1288 | * pci_add_capability always inserts the new capability at the head | |
1289 | * of the chain. Therefore to end up with a chain that matches the | |
1290 | * physical device, we insert from the end by making this recursive. | |
1291 | * This is also why we pre-caclulate size above as cached config space | |
1292 | * will be changed as we unwind the stack. | |
1293 | */ | |
1294 | if (next) { | |
1295 | ret = vfio_add_std_cap(vdev, next); | |
1296 | if (ret) { | |
1297 | return ret; | |
1298 | } | |
1299 | } else { | |
1300 | pdev->config[PCI_CAPABILITY_LIST] = 0; /* Begin the rebuild */ | |
1301 | } | |
1302 | ||
1303 | switch (cap_id) { | |
1304 | case PCI_CAP_ID_MSI: | |
1305 | ret = vfio_setup_msi(vdev, pos); | |
1306 | break; | |
1307 | case PCI_CAP_ID_MSIX: | |
1308 | ret = vfio_setup_msix(vdev, pos); | |
1309 | break; | |
1310 | default: | |
1311 | ret = pci_add_capability(pdev, cap_id, pos, size); | |
1312 | break; | |
1313 | } | |
1314 | ||
1315 | if (ret < 0) { | |
1316 | error_report("vfio: %04x:%02x:%02x.%x Error adding PCI capability " | |
1317 | "0x%x[0x%x]@0x%x: %d\n", vdev->host.domain, | |
1318 | vdev->host.bus, vdev->host.slot, vdev->host.function, | |
1319 | cap_id, size, pos, ret); | |
1320 | return ret; | |
1321 | } | |
1322 | ||
1323 | return 0; | |
1324 | } | |
1325 | ||
1326 | static int vfio_add_capabilities(VFIODevice *vdev) | |
1327 | { | |
1328 | PCIDevice *pdev = &vdev->pdev; | |
1329 | ||
1330 | if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) || | |
1331 | !pdev->config[PCI_CAPABILITY_LIST]) { | |
1332 | return 0; /* Nothing to add */ | |
1333 | } | |
1334 | ||
1335 | return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]); | |
1336 | } | |
1337 | ||
1338 | static int vfio_load_rom(VFIODevice *vdev) | |
1339 | { | |
1340 | uint64_t size = vdev->rom_size; | |
1341 | char name[32]; | |
1342 | off_t off = 0, voff = vdev->rom_offset; | |
1343 | ssize_t bytes; | |
1344 | void *ptr; | |
1345 | ||
1346 | /* If loading ROM from file, pci handles it */ | |
1347 | if (vdev->pdev.romfile || !vdev->pdev.rom_bar || !size) { | |
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain, | |
1352 | vdev->host.bus, vdev->host.slot, vdev->host.function); | |
1353 | ||
1354 | snprintf(name, sizeof(name), "vfio[%04x:%02x:%02x.%x].rom", | |
1355 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
1356 | vdev->host.function); | |
1357 | memory_region_init_ram(&vdev->pdev.rom, name, size); | |
1358 | ptr = memory_region_get_ram_ptr(&vdev->pdev.rom); | |
1359 | memset(ptr, 0xff, size); | |
1360 | ||
1361 | while (size) { | |
1362 | bytes = pread(vdev->fd, ptr + off, size, voff + off); | |
1363 | if (bytes == 0) { | |
1364 | break; /* expect that we could get back less than the ROM BAR */ | |
1365 | } else if (bytes > 0) { | |
1366 | off += bytes; | |
1367 | size -= bytes; | |
1368 | } else { | |
1369 | if (errno == EINTR || errno == EAGAIN) { | |
1370 | continue; | |
1371 | } | |
1372 | error_report("vfio: Error reading device ROM: %m\n"); | |
1373 | memory_region_destroy(&vdev->pdev.rom); | |
1374 | return -errno; | |
1375 | } | |
1376 | } | |
1377 | ||
1378 | pci_register_bar(&vdev->pdev, PCI_ROM_SLOT, 0, &vdev->pdev.rom); | |
1379 | vdev->pdev.has_rom = true; | |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | static int vfio_connect_container(VFIOGroup *group) | |
1384 | { | |
1385 | VFIOContainer *container; | |
1386 | int ret, fd; | |
1387 | ||
1388 | if (group->container) { | |
1389 | return 0; | |
1390 | } | |
1391 | ||
1392 | QLIST_FOREACH(container, &container_list, next) { | |
1393 | if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { | |
1394 | group->container = container; | |
1395 | QLIST_INSERT_HEAD(&container->group_list, group, container_next); | |
1396 | return 0; | |
1397 | } | |
1398 | } | |
1399 | ||
1400 | fd = qemu_open("/dev/vfio/vfio", O_RDWR); | |
1401 | if (fd < 0) { | |
1402 | error_report("vfio: failed to open /dev/vfio/vfio: %m\n"); | |
1403 | return -errno; | |
1404 | } | |
1405 | ||
1406 | ret = ioctl(fd, VFIO_GET_API_VERSION); | |
1407 | if (ret != VFIO_API_VERSION) { | |
1408 | error_report("vfio: supported vfio version: %d, " | |
1409 | "reported version: %d\n", VFIO_API_VERSION, ret); | |
1410 | close(fd); | |
1411 | return -EINVAL; | |
1412 | } | |
1413 | ||
1414 | container = g_malloc0(sizeof(*container)); | |
1415 | container->fd = fd; | |
1416 | ||
1417 | if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) { | |
1418 | ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd); | |
1419 | if (ret) { | |
1420 | error_report("vfio: failed to set group container: %m\n"); | |
1421 | g_free(container); | |
1422 | close(fd); | |
1423 | return -errno; | |
1424 | } | |
1425 | ||
1426 | ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU); | |
1427 | if (ret) { | |
1428 | error_report("vfio: failed to set iommu for container: %m\n"); | |
1429 | g_free(container); | |
1430 | close(fd); | |
1431 | return -errno; | |
1432 | } | |
1433 | ||
1434 | container->iommu_data.listener = vfio_memory_listener; | |
1435 | container->iommu_data.release = vfio_listener_release; | |
1436 | ||
1437 | memory_listener_register(&container->iommu_data.listener, | |
1438 | get_system_memory()); | |
1439 | } else { | |
1440 | error_report("vfio: No available IOMMU models\n"); | |
1441 | g_free(container); | |
1442 | close(fd); | |
1443 | return -EINVAL; | |
1444 | } | |
1445 | ||
1446 | QLIST_INIT(&container->group_list); | |
1447 | QLIST_INSERT_HEAD(&container_list, container, next); | |
1448 | ||
1449 | group->container = container; | |
1450 | QLIST_INSERT_HEAD(&container->group_list, group, container_next); | |
1451 | ||
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | static void vfio_disconnect_container(VFIOGroup *group) | |
1456 | { | |
1457 | VFIOContainer *container = group->container; | |
1458 | ||
1459 | if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { | |
1460 | error_report("vfio: error disconnecting group %d from container\n", | |
1461 | group->groupid); | |
1462 | } | |
1463 | ||
1464 | QLIST_REMOVE(group, container_next); | |
1465 | group->container = NULL; | |
1466 | ||
1467 | if (QLIST_EMPTY(&container->group_list)) { | |
1468 | if (container->iommu_data.release) { | |
1469 | container->iommu_data.release(container); | |
1470 | } | |
1471 | QLIST_REMOVE(container, next); | |
1472 | DPRINTF("vfio_disconnect_container: close container->fd\n"); | |
1473 | close(container->fd); | |
1474 | g_free(container); | |
1475 | } | |
1476 | } | |
1477 | ||
1478 | static VFIOGroup *vfio_get_group(int groupid) | |
1479 | { | |
1480 | VFIOGroup *group; | |
1481 | char path[32]; | |
1482 | struct vfio_group_status status = { .argsz = sizeof(status) }; | |
1483 | ||
1484 | QLIST_FOREACH(group, &group_list, next) { | |
1485 | if (group->groupid == groupid) { | |
1486 | return group; | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | group = g_malloc0(sizeof(*group)); | |
1491 | ||
1492 | snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); | |
1493 | group->fd = qemu_open(path, O_RDWR); | |
1494 | if (group->fd < 0) { | |
1495 | error_report("vfio: error opening %s: %m\n", path); | |
1496 | g_free(group); | |
1497 | return NULL; | |
1498 | } | |
1499 | ||
1500 | if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { | |
1501 | error_report("vfio: error getting group status: %m\n"); | |
1502 | close(group->fd); | |
1503 | g_free(group); | |
1504 | return NULL; | |
1505 | } | |
1506 | ||
1507 | if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { | |
1508 | error_report("vfio: error, group %d is not viable, please ensure " | |
1509 | "all devices within the iommu_group are bound to their " | |
1510 | "vfio bus driver.\n", groupid); | |
1511 | close(group->fd); | |
1512 | g_free(group); | |
1513 | return NULL; | |
1514 | } | |
1515 | ||
1516 | group->groupid = groupid; | |
1517 | QLIST_INIT(&group->device_list); | |
1518 | ||
1519 | if (vfio_connect_container(group)) { | |
1520 | error_report("vfio: failed to setup container for group %d\n", groupid); | |
1521 | close(group->fd); | |
1522 | g_free(group); | |
1523 | return NULL; | |
1524 | } | |
1525 | ||
1526 | QLIST_INSERT_HEAD(&group_list, group, next); | |
1527 | ||
1528 | return group; | |
1529 | } | |
1530 | ||
1531 | static void vfio_put_group(VFIOGroup *group) | |
1532 | { | |
1533 | if (!QLIST_EMPTY(&group->device_list)) { | |
1534 | return; | |
1535 | } | |
1536 | ||
1537 | vfio_disconnect_container(group); | |
1538 | QLIST_REMOVE(group, next); | |
1539 | DPRINTF("vfio_put_group: close group->fd\n"); | |
1540 | close(group->fd); | |
1541 | g_free(group); | |
1542 | } | |
1543 | ||
1544 | static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev) | |
1545 | { | |
1546 | struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) }; | |
1547 | struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) }; | |
1548 | int ret, i; | |
1549 | ||
1550 | ret = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name); | |
1551 | if (ret < 0) { | |
1552 | error_report("vfio: error getting device %s from group %d: %m\n", | |
1553 | name, group->groupid); | |
1554 | error_report("Verify all devices in group %d are bound to vfio-pci " | |
1555 | "or pci-stub and not already in use\n", group->groupid); | |
1556 | return ret; | |
1557 | } | |
1558 | ||
1559 | vdev->fd = ret; | |
1560 | vdev->group = group; | |
1561 | QLIST_INSERT_HEAD(&group->device_list, vdev, next); | |
1562 | ||
1563 | /* Sanity check device */ | |
1564 | ret = ioctl(vdev->fd, VFIO_DEVICE_GET_INFO, &dev_info); | |
1565 | if (ret) { | |
1566 | error_report("vfio: error getting device info: %m\n"); | |
1567 | goto error; | |
1568 | } | |
1569 | ||
1570 | DPRINTF("Device %s flags: %u, regions: %u, irgs: %u\n", name, | |
1571 | dev_info.flags, dev_info.num_regions, dev_info.num_irqs); | |
1572 | ||
1573 | if (!(dev_info.flags & VFIO_DEVICE_FLAGS_PCI)) { | |
1574 | error_report("vfio: Um, this isn't a PCI device\n"); | |
1575 | goto error; | |
1576 | } | |
1577 | ||
1578 | vdev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET); | |
1579 | if (!vdev->reset_works) { | |
1580 | error_report("Warning, device %s does not support reset\n", name); | |
1581 | } | |
1582 | ||
1583 | if (dev_info.num_regions != VFIO_PCI_NUM_REGIONS) { | |
1584 | error_report("vfio: unexpected number of io regions %u\n", | |
1585 | dev_info.num_regions); | |
1586 | goto error; | |
1587 | } | |
1588 | ||
1589 | if (dev_info.num_irqs != VFIO_PCI_NUM_IRQS) { | |
1590 | error_report("vfio: unexpected number of irqs %u\n", dev_info.num_irqs); | |
1591 | goto error; | |
1592 | } | |
1593 | ||
1594 | for (i = VFIO_PCI_BAR0_REGION_INDEX; i < VFIO_PCI_ROM_REGION_INDEX; i++) { | |
1595 | reg_info.index = i; | |
1596 | ||
1597 | ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info); | |
1598 | if (ret) { | |
1599 | error_report("vfio: Error getting region %d info: %m\n", i); | |
1600 | goto error; | |
1601 | } | |
1602 | ||
1603 | DPRINTF("Device %s region %d:\n", name, i); | |
1604 | DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n", | |
1605 | (unsigned long)reg_info.size, (unsigned long)reg_info.offset, | |
1606 | (unsigned long)reg_info.flags); | |
1607 | ||
1608 | vdev->bars[i].flags = reg_info.flags; | |
1609 | vdev->bars[i].size = reg_info.size; | |
1610 | vdev->bars[i].fd_offset = reg_info.offset; | |
1611 | vdev->bars[i].fd = vdev->fd; | |
1612 | vdev->bars[i].nr = i; | |
1613 | } | |
1614 | ||
1615 | reg_info.index = VFIO_PCI_ROM_REGION_INDEX; | |
1616 | ||
1617 | ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info); | |
1618 | if (ret) { | |
1619 | error_report("vfio: Error getting ROM info: %m\n"); | |
1620 | goto error; | |
1621 | } | |
1622 | ||
1623 | DPRINTF("Device %s ROM:\n", name); | |
1624 | DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n", | |
1625 | (unsigned long)reg_info.size, (unsigned long)reg_info.offset, | |
1626 | (unsigned long)reg_info.flags); | |
1627 | ||
1628 | vdev->rom_size = reg_info.size; | |
1629 | vdev->rom_offset = reg_info.offset; | |
1630 | ||
1631 | reg_info.index = VFIO_PCI_CONFIG_REGION_INDEX; | |
1632 | ||
1633 | ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info); | |
1634 | if (ret) { | |
1635 | error_report("vfio: Error getting config info: %m\n"); | |
1636 | goto error; | |
1637 | } | |
1638 | ||
1639 | DPRINTF("Device %s config:\n", name); | |
1640 | DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n", | |
1641 | (unsigned long)reg_info.size, (unsigned long)reg_info.offset, | |
1642 | (unsigned long)reg_info.flags); | |
1643 | ||
1644 | vdev->config_size = reg_info.size; | |
1645 | vdev->config_offset = reg_info.offset; | |
1646 | ||
1647 | error: | |
1648 | if (ret) { | |
1649 | QLIST_REMOVE(vdev, next); | |
1650 | vdev->group = NULL; | |
1651 | close(vdev->fd); | |
1652 | } | |
1653 | return ret; | |
1654 | } | |
1655 | ||
1656 | static void vfio_put_device(VFIODevice *vdev) | |
1657 | { | |
1658 | QLIST_REMOVE(vdev, next); | |
1659 | vdev->group = NULL; | |
1660 | DPRINTF("vfio_put_device: close vdev->fd\n"); | |
1661 | close(vdev->fd); | |
1662 | if (vdev->msix) { | |
1663 | g_free(vdev->msix); | |
1664 | vdev->msix = NULL; | |
1665 | } | |
1666 | } | |
1667 | ||
1668 | static int vfio_initfn(PCIDevice *pdev) | |
1669 | { | |
1670 | VFIODevice *pvdev, *vdev = DO_UPCAST(VFIODevice, pdev, pdev); | |
1671 | VFIOGroup *group; | |
1672 | char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name; | |
1673 | ssize_t len; | |
1674 | struct stat st; | |
1675 | int groupid; | |
1676 | int ret; | |
1677 | ||
1678 | /* Check that the host device exists */ | |
1679 | snprintf(path, sizeof(path), | |
1680 | "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/", | |
1681 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
1682 | vdev->host.function); | |
1683 | if (stat(path, &st) < 0) { | |
1684 | error_report("vfio: error: no such host device: %s\n", path); | |
1685 | return -errno; | |
1686 | } | |
1687 | ||
1688 | strncat(path, "iommu_group", sizeof(path) - strlen(path) - 1); | |
1689 | ||
1690 | len = readlink(path, iommu_group_path, PATH_MAX); | |
1691 | if (len <= 0) { | |
1692 | error_report("vfio: error no iommu_group for device\n"); | |
1693 | return -errno; | |
1694 | } | |
1695 | ||
1696 | iommu_group_path[len] = 0; | |
1697 | group_name = basename(iommu_group_path); | |
1698 | ||
1699 | if (sscanf(group_name, "%d", &groupid) != 1) { | |
1700 | error_report("vfio: error reading %s: %m\n", path); | |
1701 | return -errno; | |
1702 | } | |
1703 | ||
1704 | DPRINTF("%s(%04x:%02x:%02x.%x) group %d\n", __func__, vdev->host.domain, | |
1705 | vdev->host.bus, vdev->host.slot, vdev->host.function, groupid); | |
1706 | ||
1707 | group = vfio_get_group(groupid); | |
1708 | if (!group) { | |
1709 | error_report("vfio: failed to get group %d\n", groupid); | |
1710 | return -ENOENT; | |
1711 | } | |
1712 | ||
1713 | snprintf(path, sizeof(path), "%04x:%02x:%02x.%01x", | |
1714 | vdev->host.domain, vdev->host.bus, vdev->host.slot, | |
1715 | vdev->host.function); | |
1716 | ||
1717 | QLIST_FOREACH(pvdev, &group->device_list, next) { | |
1718 | if (pvdev->host.domain == vdev->host.domain && | |
1719 | pvdev->host.bus == vdev->host.bus && | |
1720 | pvdev->host.slot == vdev->host.slot && | |
1721 | pvdev->host.function == vdev->host.function) { | |
1722 | ||
1723 | error_report("vfio: error: device %s is already attached\n", path); | |
1724 | vfio_put_group(group); | |
1725 | return -EBUSY; | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | ret = vfio_get_device(group, path, vdev); | |
1730 | if (ret) { | |
1731 | error_report("vfio: failed to get device %s\n", path); | |
1732 | vfio_put_group(group); | |
1733 | return ret; | |
1734 | } | |
1735 | ||
1736 | /* Get a copy of config space */ | |
1737 | ret = pread(vdev->fd, vdev->pdev.config, | |
1738 | MIN(pci_config_size(&vdev->pdev), vdev->config_size), | |
1739 | vdev->config_offset); | |
1740 | if (ret < (int)MIN(pci_config_size(&vdev->pdev), vdev->config_size)) { | |
1741 | ret = ret < 0 ? -errno : -EFAULT; | |
1742 | error_report("vfio: Failed to read device config space\n"); | |
1743 | goto out_put; | |
1744 | } | |
1745 | ||
1746 | /* | |
1747 | * Clear host resource mapping info. If we choose not to register a | |
1748 | * BAR, such as might be the case with the option ROM, we can get | |
1749 | * confusing, unwritable, residual addresses from the host here. | |
1750 | */ | |
1751 | memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24); | |
1752 | memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4); | |
1753 | ||
1754 | vfio_load_rom(vdev); | |
1755 | ||
1756 | ret = vfio_early_setup_msix(vdev); | |
1757 | if (ret) { | |
1758 | goto out_put; | |
1759 | } | |
1760 | ||
1761 | vfio_map_bars(vdev); | |
1762 | ||
1763 | ret = vfio_add_capabilities(vdev); | |
1764 | if (ret) { | |
1765 | goto out_teardown; | |
1766 | } | |
1767 | ||
1768 | if (vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1)) { | |
1769 | if (vdev->intx.intx && strcmp(vdev->intx.intx, "off")) { | |
1770 | error_report("vfio: Unknown option x-intx=%s, " | |
1771 | "valid options: \"off\".\n", vdev->intx.intx); | |
1772 | ret = -EINVAL; | |
1773 | goto out_teardown; | |
1774 | } | |
1775 | ||
1776 | if (vdev->intx.intx && !strcmp(vdev->intx.intx, "off")) { | |
1777 | vdev->intx.disabled = true; | |
1778 | } | |
1779 | ||
1780 | ret = vfio_enable_intx(vdev); | |
1781 | if (ret) { | |
1782 | goto out_teardown; | |
1783 | } | |
1784 | } | |
1785 | ||
1786 | return 0; | |
1787 | ||
1788 | out_teardown: | |
1789 | pci_device_set_intx_routing_notifier(&vdev->pdev, NULL); | |
1790 | vfio_teardown_msi(vdev); | |
1791 | vfio_unmap_bars(vdev); | |
1792 | out_put: | |
1793 | vfio_put_device(vdev); | |
1794 | vfio_put_group(group); | |
1795 | return ret; | |
1796 | } | |
1797 | ||
1798 | static void vfio_exitfn(PCIDevice *pdev) | |
1799 | { | |
1800 | VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); | |
1801 | VFIOGroup *group = vdev->group; | |
1802 | ||
1803 | pci_device_set_intx_routing_notifier(&vdev->pdev, NULL); | |
1804 | vfio_disable_interrupts(vdev); | |
1805 | vfio_teardown_msi(vdev); | |
1806 | vfio_unmap_bars(vdev); | |
1807 | vfio_put_device(vdev); | |
1808 | vfio_put_group(group); | |
1809 | } | |
1810 | ||
1811 | static void vfio_pci_reset(DeviceState *dev) | |
1812 | { | |
1813 | PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev); | |
1814 | VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev); | |
1815 | ||
1816 | if (!vdev->reset_works) { | |
1817 | return; | |
1818 | } | |
1819 | ||
1820 | if (ioctl(vdev->fd, VFIO_DEVICE_RESET)) { | |
1821 | error_report("vfio: Error unable to reset physical device " | |
1822 | "(%04x:%02x:%02x.%x): %m\n", vdev->host.domain, | |
1823 | vdev->host.bus, vdev->host.slot, vdev->host.function); | |
1824 | } | |
1825 | } | |
1826 | ||
1827 | static Property vfio_pci_dev_properties[] = { | |
1828 | DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIODevice, host), | |
1829 | DEFINE_PROP_STRING("x-intx", VFIODevice, intx.intx), | |
1830 | /* | |
1831 | * TODO - support passed fds... is this necessary? | |
1832 | * DEFINE_PROP_STRING("vfiofd", VFIODevice, vfiofd_name), | |
1833 | * DEFINE_PROP_STRING("vfiogroupfd, VFIODevice, vfiogroupfd_name), | |
1834 | */ | |
1835 | DEFINE_PROP_END_OF_LIST(), | |
1836 | }; | |
1837 | ||
1838 | ||
1839 | static void vfio_pci_dev_class_init(ObjectClass *klass, void *data) | |
1840 | { | |
1841 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1842 | PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass); | |
1843 | ||
1844 | dc->reset = vfio_pci_reset; | |
1845 | dc->props = vfio_pci_dev_properties; | |
1846 | pdc->init = vfio_initfn; | |
1847 | pdc->exit = vfio_exitfn; | |
1848 | pdc->config_read = vfio_pci_read_config; | |
1849 | pdc->config_write = vfio_pci_write_config; | |
1850 | } | |
1851 | ||
1852 | static const TypeInfo vfio_pci_dev_info = { | |
1853 | .name = "vfio-pci", | |
1854 | .parent = TYPE_PCI_DEVICE, | |
1855 | .instance_size = sizeof(VFIODevice), | |
1856 | .class_init = vfio_pci_dev_class_init, | |
1857 | }; | |
1858 | ||
1859 | static void register_vfio_pci_dev_type(void) | |
1860 | { | |
1861 | type_register_static(&vfio_pci_dev_info); | |
1862 | } | |
1863 | ||
1864 | type_init(register_vfio_pci_dev_type) |