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Commit | Line | Data |
---|---|---|
956a9202 RW |
1 | /* |
2 | * Xen PCI Frontend. | |
3 | * | |
4 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> | |
5 | */ | |
6 | #include <linux/module.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/mm.h> | |
9 | #include <xen/xenbus.h> | |
10 | #include <xen/events.h> | |
11 | #include <xen/grant_table.h> | |
12 | #include <xen/page.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/pci.h> | |
15 | #include <linux/msi.h> | |
956a9202 RW |
16 | #include <xen/interface/io/pciif.h> |
17 | #include <asm/xen/pci.h> | |
18 | #include <linux/interrupt.h> | |
60063497 | 19 | #include <linux/atomic.h> |
956a9202 RW |
20 | #include <linux/workqueue.h> |
21 | #include <linux/bitops.h> | |
22 | #include <linux/time.h> | |
23 | ||
3d925320 | 24 | #include <asm/xen/swiotlb-xen.h> |
956a9202 RW |
25 | #define INVALID_GRANT_REF (0) |
26 | #define INVALID_EVTCHN (-1) | |
27 | ||
28 | struct pci_bus_entry { | |
29 | struct list_head list; | |
30 | struct pci_bus *bus; | |
31 | }; | |
32 | ||
33 | #define _PDEVB_op_active (0) | |
34 | #define PDEVB_op_active (1 << (_PDEVB_op_active)) | |
35 | ||
36 | struct pcifront_device { | |
37 | struct xenbus_device *xdev; | |
38 | struct list_head root_buses; | |
39 | ||
40 | int evtchn; | |
41 | int gnt_ref; | |
42 | ||
43 | int irq; | |
44 | ||
45 | /* Lock this when doing any operations in sh_info */ | |
46 | spinlock_t sh_info_lock; | |
47 | struct xen_pci_sharedinfo *sh_info; | |
48 | struct work_struct op_work; | |
49 | unsigned long flags; | |
50 | ||
51 | }; | |
52 | ||
53 | struct pcifront_sd { | |
54 | int domain; | |
55 | struct pcifront_device *pdev; | |
56 | }; | |
57 | ||
58 | static inline struct pcifront_device * | |
59 | pcifront_get_pdev(struct pcifront_sd *sd) | |
60 | { | |
61 | return sd->pdev; | |
62 | } | |
63 | ||
64 | static inline void pcifront_init_sd(struct pcifront_sd *sd, | |
65 | unsigned int domain, unsigned int bus, | |
66 | struct pcifront_device *pdev) | |
67 | { | |
68 | sd->domain = domain; | |
69 | sd->pdev = pdev; | |
70 | } | |
71 | ||
72 | static DEFINE_SPINLOCK(pcifront_dev_lock); | |
73 | static struct pcifront_device *pcifront_dev; | |
74 | ||
75 | static int verbose_request; | |
76 | module_param(verbose_request, int, 0644); | |
77 | ||
78 | static int errno_to_pcibios_err(int errno) | |
79 | { | |
80 | switch (errno) { | |
81 | case XEN_PCI_ERR_success: | |
82 | return PCIBIOS_SUCCESSFUL; | |
83 | ||
84 | case XEN_PCI_ERR_dev_not_found: | |
85 | return PCIBIOS_DEVICE_NOT_FOUND; | |
86 | ||
87 | case XEN_PCI_ERR_invalid_offset: | |
88 | case XEN_PCI_ERR_op_failed: | |
89 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
90 | ||
91 | case XEN_PCI_ERR_not_implemented: | |
92 | return PCIBIOS_FUNC_NOT_SUPPORTED; | |
93 | ||
94 | case XEN_PCI_ERR_access_denied: | |
95 | return PCIBIOS_SET_FAILED; | |
96 | } | |
97 | return errno; | |
98 | } | |
99 | ||
100 | static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev) | |
101 | { | |
102 | if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags) | |
103 | && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) { | |
104 | dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n"); | |
105 | schedule_work(&pdev->op_work); | |
106 | } | |
107 | } | |
108 | ||
109 | static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) | |
110 | { | |
111 | int err = 0; | |
112 | struct xen_pci_op *active_op = &pdev->sh_info->op; | |
113 | unsigned long irq_flags; | |
114 | evtchn_port_t port = pdev->evtchn; | |
115 | unsigned irq = pdev->irq; | |
116 | s64 ns, ns_timeout; | |
117 | struct timeval tv; | |
118 | ||
119 | spin_lock_irqsave(&pdev->sh_info_lock, irq_flags); | |
120 | ||
121 | memcpy(active_op, op, sizeof(struct xen_pci_op)); | |
122 | ||
123 | /* Go */ | |
124 | wmb(); | |
125 | set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags); | |
126 | notify_remote_via_evtchn(port); | |
127 | ||
128 | /* | |
129 | * We set a poll timeout of 3 seconds but give up on return after | |
130 | * 2 seconds. It is better to time out too late rather than too early | |
131 | * (in the latter case we end up continually re-executing poll() with a | |
132 | * timeout in the past). 1s difference gives plenty of slack for error. | |
133 | */ | |
134 | do_gettimeofday(&tv); | |
135 | ns_timeout = timeval_to_ns(&tv) + 2 * (s64)NSEC_PER_SEC; | |
136 | ||
137 | xen_clear_irq_pending(irq); | |
138 | ||
139 | while (test_bit(_XEN_PCIF_active, | |
140 | (unsigned long *)&pdev->sh_info->flags)) { | |
141 | xen_poll_irq_timeout(irq, jiffies + 3*HZ); | |
142 | xen_clear_irq_pending(irq); | |
143 | do_gettimeofday(&tv); | |
144 | ns = timeval_to_ns(&tv); | |
145 | if (ns > ns_timeout) { | |
146 | dev_err(&pdev->xdev->dev, | |
147 | "pciback not responding!!!\n"); | |
148 | clear_bit(_XEN_PCIF_active, | |
149 | (unsigned long *)&pdev->sh_info->flags); | |
150 | err = XEN_PCI_ERR_dev_not_found; | |
151 | goto out; | |
152 | } | |
153 | } | |
154 | ||
155 | /* | |
156 | * We might lose backend service request since we | |
157 | * reuse same evtchn with pci_conf backend response. So re-schedule | |
158 | * aer pcifront service. | |
159 | */ | |
160 | if (test_bit(_XEN_PCIB_active, | |
161 | (unsigned long *)&pdev->sh_info->flags)) { | |
162 | dev_err(&pdev->xdev->dev, | |
163 | "schedule aer pcifront service\n"); | |
164 | schedule_pcifront_aer_op(pdev); | |
165 | } | |
166 | ||
167 | memcpy(op, active_op, sizeof(struct xen_pci_op)); | |
168 | ||
169 | err = op->err; | |
170 | out: | |
171 | spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags); | |
172 | return err; | |
173 | } | |
174 | ||
175 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
176 | static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn, | |
177 | int where, int size, u32 *val) | |
178 | { | |
179 | int err = 0; | |
180 | struct xen_pci_op op = { | |
181 | .cmd = XEN_PCI_OP_conf_read, | |
182 | .domain = pci_domain_nr(bus), | |
183 | .bus = bus->number, | |
184 | .devfn = devfn, | |
185 | .offset = where, | |
186 | .size = size, | |
187 | }; | |
188 | struct pcifront_sd *sd = bus->sysdata; | |
189 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
190 | ||
191 | if (verbose_request) | |
192 | dev_info(&pdev->xdev->dev, | |
e4de866a | 193 | "read dev=%04x:%02x:%02x.%d - offset %x size %d\n", |
956a9202 RW |
194 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), |
195 | PCI_FUNC(devfn), where, size); | |
196 | ||
197 | err = do_pci_op(pdev, &op); | |
198 | ||
199 | if (likely(!err)) { | |
200 | if (verbose_request) | |
201 | dev_info(&pdev->xdev->dev, "read got back value %x\n", | |
202 | op.value); | |
203 | ||
204 | *val = op.value; | |
205 | } else if (err == -ENODEV) { | |
206 | /* No device here, pretend that it just returned 0 */ | |
207 | err = 0; | |
208 | *val = 0; | |
209 | } | |
210 | ||
211 | return errno_to_pcibios_err(err); | |
212 | } | |
213 | ||
214 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
215 | static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn, | |
216 | int where, int size, u32 val) | |
217 | { | |
218 | struct xen_pci_op op = { | |
219 | .cmd = XEN_PCI_OP_conf_write, | |
220 | .domain = pci_domain_nr(bus), | |
221 | .bus = bus->number, | |
222 | .devfn = devfn, | |
223 | .offset = where, | |
224 | .size = size, | |
225 | .value = val, | |
226 | }; | |
227 | struct pcifront_sd *sd = bus->sysdata; | |
228 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
229 | ||
230 | if (verbose_request) | |
231 | dev_info(&pdev->xdev->dev, | |
e4de866a | 232 | "write dev=%04x:%02x:%02x.%d - " |
956a9202 RW |
233 | "offset %x size %d val %x\n", |
234 | pci_domain_nr(bus), bus->number, | |
235 | PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); | |
236 | ||
237 | return errno_to_pcibios_err(do_pci_op(pdev, &op)); | |
238 | } | |
239 | ||
b8b0f559 | 240 | static struct pci_ops pcifront_bus_ops = { |
956a9202 RW |
241 | .read = pcifront_bus_read, |
242 | .write = pcifront_bus_write, | |
243 | }; | |
244 | ||
245 | #ifdef CONFIG_PCI_MSI | |
246 | static int pci_frontend_enable_msix(struct pci_dev *dev, | |
cc0f89c4 | 247 | int vector[], int nvec) |
956a9202 RW |
248 | { |
249 | int err; | |
250 | int i; | |
251 | struct xen_pci_op op = { | |
252 | .cmd = XEN_PCI_OP_enable_msix, | |
253 | .domain = pci_domain_nr(dev->bus), | |
254 | .bus = dev->bus->number, | |
255 | .devfn = dev->devfn, | |
256 | .value = nvec, | |
257 | }; | |
258 | struct pcifront_sd *sd = dev->bus->sysdata; | |
259 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
260 | struct msi_desc *entry; | |
261 | ||
262 | if (nvec > SH_INFO_MAX_VEC) { | |
263 | dev_err(&dev->dev, "too much vector for pci frontend: %x." | |
264 | " Increase SH_INFO_MAX_VEC.\n", nvec); | |
265 | return -EINVAL; | |
266 | } | |
267 | ||
268 | i = 0; | |
269 | list_for_each_entry(entry, &dev->msi_list, list) { | |
270 | op.msix_entries[i].entry = entry->msi_attrib.entry_nr; | |
271 | /* Vector is useless at this point. */ | |
272 | op.msix_entries[i].vector = -1; | |
273 | i++; | |
274 | } | |
275 | ||
276 | err = do_pci_op(pdev, &op); | |
277 | ||
278 | if (likely(!err)) { | |
279 | if (likely(!op.value)) { | |
280 | /* we get the result */ | |
1d461052 KRW |
281 | for (i = 0; i < nvec; i++) { |
282 | if (op.msix_entries[i].vector <= 0) { | |
283 | dev_warn(&dev->dev, "MSI-X entry %d is invalid: %d!\n", | |
284 | i, op.msix_entries[i].vector); | |
285 | err = -EINVAL; | |
cc0f89c4 | 286 | vector[i] = -1; |
1d461052 KRW |
287 | continue; |
288 | } | |
cc0f89c4 | 289 | vector[i] = op.msix_entries[i].vector; |
1d461052 | 290 | } |
956a9202 RW |
291 | } else { |
292 | printk(KERN_DEBUG "enable msix get value %x\n", | |
293 | op.value); | |
f09d8432 | 294 | err = op.value; |
956a9202 RW |
295 | } |
296 | } else { | |
297 | dev_err(&dev->dev, "enable msix get err %x\n", err); | |
956a9202 | 298 | } |
1d461052 | 299 | return err; |
956a9202 RW |
300 | } |
301 | ||
302 | static void pci_frontend_disable_msix(struct pci_dev *dev) | |
303 | { | |
304 | int err; | |
305 | struct xen_pci_op op = { | |
306 | .cmd = XEN_PCI_OP_disable_msix, | |
307 | .domain = pci_domain_nr(dev->bus), | |
308 | .bus = dev->bus->number, | |
309 | .devfn = dev->devfn, | |
310 | }; | |
311 | struct pcifront_sd *sd = dev->bus->sysdata; | |
312 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
313 | ||
314 | err = do_pci_op(pdev, &op); | |
315 | ||
316 | /* What should do for error ? */ | |
317 | if (err) | |
318 | dev_err(&dev->dev, "pci_disable_msix get err %x\n", err); | |
319 | } | |
320 | ||
cc0f89c4 | 321 | static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[]) |
956a9202 RW |
322 | { |
323 | int err; | |
324 | struct xen_pci_op op = { | |
325 | .cmd = XEN_PCI_OP_enable_msi, | |
326 | .domain = pci_domain_nr(dev->bus), | |
327 | .bus = dev->bus->number, | |
328 | .devfn = dev->devfn, | |
329 | }; | |
330 | struct pcifront_sd *sd = dev->bus->sysdata; | |
331 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
332 | ||
333 | err = do_pci_op(pdev, &op); | |
334 | if (likely(!err)) { | |
cc0f89c4 | 335 | vector[0] = op.value; |
1d461052 KRW |
336 | if (op.value <= 0) { |
337 | dev_warn(&dev->dev, "MSI entry is invalid: %d!\n", | |
338 | op.value); | |
339 | err = -EINVAL; | |
cc0f89c4 | 340 | vector[0] = -1; |
1d461052 | 341 | } |
956a9202 RW |
342 | } else { |
343 | dev_err(&dev->dev, "pci frontend enable msi failed for dev " | |
344 | "%x:%x\n", op.bus, op.devfn); | |
345 | err = -EINVAL; | |
346 | } | |
347 | return err; | |
348 | } | |
349 | ||
350 | static void pci_frontend_disable_msi(struct pci_dev *dev) | |
351 | { | |
352 | int err; | |
353 | struct xen_pci_op op = { | |
354 | .cmd = XEN_PCI_OP_disable_msi, | |
355 | .domain = pci_domain_nr(dev->bus), | |
356 | .bus = dev->bus->number, | |
357 | .devfn = dev->devfn, | |
358 | }; | |
359 | struct pcifront_sd *sd = dev->bus->sysdata; | |
360 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
361 | ||
362 | err = do_pci_op(pdev, &op); | |
363 | if (err == XEN_PCI_ERR_dev_not_found) { | |
364 | /* XXX No response from backend, what shall we do? */ | |
365 | printk(KERN_DEBUG "get no response from backend for disable MSI\n"); | |
366 | return; | |
367 | } | |
368 | if (err) | |
369 | /* how can pciback notify us fail? */ | |
370 | printk(KERN_DEBUG "get fake response frombackend\n"); | |
371 | } | |
372 | ||
373 | static struct xen_pci_frontend_ops pci_frontend_ops = { | |
374 | .enable_msi = pci_frontend_enable_msi, | |
375 | .disable_msi = pci_frontend_disable_msi, | |
376 | .enable_msix = pci_frontend_enable_msix, | |
377 | .disable_msix = pci_frontend_disable_msix, | |
378 | }; | |
379 | ||
380 | static void pci_frontend_registrar(int enable) | |
381 | { | |
382 | if (enable) | |
383 | xen_pci_frontend = &pci_frontend_ops; | |
384 | else | |
385 | xen_pci_frontend = NULL; | |
386 | }; | |
387 | #else | |
388 | static inline void pci_frontend_registrar(int enable) { }; | |
389 | #endif /* CONFIG_PCI_MSI */ | |
390 | ||
391 | /* Claim resources for the PCI frontend as-is, backend won't allow changes */ | |
392 | static int pcifront_claim_resource(struct pci_dev *dev, void *data) | |
393 | { | |
394 | struct pcifront_device *pdev = data; | |
395 | int i; | |
396 | struct resource *r; | |
397 | ||
398 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
399 | r = &dev->resource[i]; | |
400 | ||
401 | if (!r->parent && r->start && r->flags) { | |
402 | dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n", | |
403 | pci_name(dev), i); | |
404 | if (pci_claim_resource(dev, i)) { | |
917e3e65 KRW |
405 | dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! " |
406 | "Device offline. Try using e820_host=1 in the guest config.\n", | |
956a9202 RW |
407 | pci_name(dev), i); |
408 | } | |
409 | } | |
410 | } | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
15856ad5 | 415 | static int pcifront_scan_bus(struct pcifront_device *pdev, |
956a9202 RW |
416 | unsigned int domain, unsigned int bus, |
417 | struct pci_bus *b) | |
418 | { | |
419 | struct pci_dev *d; | |
420 | unsigned int devfn; | |
421 | ||
422 | /* Scan the bus for functions and add. | |
423 | * We omit handling of PCI bridge attachment because pciback prevents | |
424 | * bridges from being exported. | |
425 | */ | |
426 | for (devfn = 0; devfn < 0x100; devfn++) { | |
427 | d = pci_get_slot(b, devfn); | |
428 | if (d) { | |
429 | /* Device is already known. */ | |
430 | pci_dev_put(d); | |
431 | continue; | |
432 | } | |
433 | ||
434 | d = pci_scan_single_device(b, devfn); | |
435 | if (d) | |
436 | dev_info(&pdev->xdev->dev, "New device on " | |
e4de866a | 437 | "%04x:%02x:%02x.%d found.\n", domain, bus, |
956a9202 RW |
438 | PCI_SLOT(devfn), PCI_FUNC(devfn)); |
439 | } | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
15856ad5 | 444 | static int pcifront_scan_root(struct pcifront_device *pdev, |
956a9202 RW |
445 | unsigned int domain, unsigned int bus) |
446 | { | |
447 | struct pci_bus *b; | |
448 | struct pcifront_sd *sd = NULL; | |
449 | struct pci_bus_entry *bus_entry = NULL; | |
450 | int err = 0; | |
451 | ||
452 | #ifndef CONFIG_PCI_DOMAINS | |
453 | if (domain != 0) { | |
454 | dev_err(&pdev->xdev->dev, | |
455 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
456 | dev_err(&pdev->xdev->dev, | |
457 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
458 | err = -EINVAL; | |
459 | goto err_out; | |
460 | } | |
461 | #endif | |
462 | ||
463 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", | |
464 | domain, bus); | |
465 | ||
466 | bus_entry = kmalloc(sizeof(*bus_entry), GFP_KERNEL); | |
467 | sd = kmalloc(sizeof(*sd), GFP_KERNEL); | |
468 | if (!bus_entry || !sd) { | |
469 | err = -ENOMEM; | |
470 | goto err_out; | |
471 | } | |
472 | pcifront_init_sd(sd, domain, bus, pdev); | |
473 | ||
474 | b = pci_scan_bus_parented(&pdev->xdev->dev, bus, | |
475 | &pcifront_bus_ops, sd); | |
476 | if (!b) { | |
477 | dev_err(&pdev->xdev->dev, | |
478 | "Error creating PCI Frontend Bus!\n"); | |
479 | err = -ENOMEM; | |
480 | goto err_out; | |
481 | } | |
482 | ||
483 | bus_entry->bus = b; | |
484 | ||
485 | list_add(&bus_entry->list, &pdev->root_buses); | |
486 | ||
487 | /* pci_scan_bus_parented skips devices which do not have a have | |
488 | * devfn==0. The pcifront_scan_bus enumerates all devfn. */ | |
489 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
490 | ||
491 | /* Claim resources before going "live" with our devices */ | |
492 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
493 | ||
494 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
495 | pci_bus_add_devices(b); | |
496 | ||
497 | return err; | |
498 | ||
499 | err_out: | |
500 | kfree(bus_entry); | |
501 | kfree(sd); | |
502 | ||
503 | return err; | |
504 | } | |
505 | ||
15856ad5 | 506 | static int pcifront_rescan_root(struct pcifront_device *pdev, |
956a9202 RW |
507 | unsigned int domain, unsigned int bus) |
508 | { | |
509 | int err; | |
510 | struct pci_bus *b; | |
511 | ||
512 | #ifndef CONFIG_PCI_DOMAINS | |
513 | if (domain != 0) { | |
514 | dev_err(&pdev->xdev->dev, | |
515 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
516 | dev_err(&pdev->xdev->dev, | |
517 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
518 | return -EINVAL; | |
519 | } | |
520 | #endif | |
521 | ||
522 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", | |
523 | domain, bus); | |
524 | ||
525 | b = pci_find_bus(domain, bus); | |
526 | if (!b) | |
527 | /* If the bus is unknown, create it. */ | |
528 | return pcifront_scan_root(pdev, domain, bus); | |
529 | ||
530 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
531 | ||
532 | /* Claim resources before going "live" with our devices */ | |
533 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
534 | ||
535 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
536 | pci_bus_add_devices(b); | |
537 | ||
538 | return err; | |
539 | } | |
540 | ||
541 | static void free_root_bus_devs(struct pci_bus *bus) | |
542 | { | |
543 | struct pci_dev *dev; | |
544 | ||
545 | while (!list_empty(&bus->devices)) { | |
546 | dev = container_of(bus->devices.next, struct pci_dev, | |
547 | bus_list); | |
548 | dev_dbg(&dev->dev, "removing device\n"); | |
210647af | 549 | pci_stop_and_remove_bus_device(dev); |
956a9202 RW |
550 | } |
551 | } | |
552 | ||
553 | static void pcifront_free_roots(struct pcifront_device *pdev) | |
554 | { | |
555 | struct pci_bus_entry *bus_entry, *t; | |
556 | ||
557 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); | |
558 | ||
559 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { | |
560 | list_del(&bus_entry->list); | |
561 | ||
562 | free_root_bus_devs(bus_entry->bus); | |
563 | ||
564 | kfree(bus_entry->bus->sysdata); | |
565 | ||
566 | device_unregister(bus_entry->bus->bridge); | |
567 | pci_remove_bus(bus_entry->bus); | |
568 | ||
569 | kfree(bus_entry); | |
570 | } | |
571 | } | |
572 | ||
573 | static pci_ers_result_t pcifront_common_process(int cmd, | |
574 | struct pcifront_device *pdev, | |
575 | pci_channel_state_t state) | |
576 | { | |
577 | pci_ers_result_t result; | |
578 | struct pci_driver *pdrv; | |
579 | int bus = pdev->sh_info->aer_op.bus; | |
580 | int devfn = pdev->sh_info->aer_op.devfn; | |
581 | struct pci_dev *pcidev; | |
582 | int flag = 0; | |
583 | ||
584 | dev_dbg(&pdev->xdev->dev, | |
585 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", | |
586 | cmd, bus, devfn); | |
587 | result = PCI_ERS_RESULT_NONE; | |
588 | ||
589 | pcidev = pci_get_bus_and_slot(bus, devfn); | |
590 | if (!pcidev || !pcidev->driver) { | |
2a63dd72 JS |
591 | dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); |
592 | if (pcidev) | |
593 | pci_dev_put(pcidev); | |
956a9202 RW |
594 | return result; |
595 | } | |
596 | pdrv = pcidev->driver; | |
597 | ||
07d25146 | 598 | if (pdrv) { |
956a9202 RW |
599 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { |
600 | dev_dbg(&pcidev->dev, | |
601 | "trying to call AER service\n"); | |
602 | if (pcidev) { | |
603 | flag = 1; | |
604 | switch (cmd) { | |
605 | case XEN_PCI_OP_aer_detected: | |
606 | result = pdrv->err_handler-> | |
607 | error_detected(pcidev, state); | |
608 | break; | |
609 | case XEN_PCI_OP_aer_mmio: | |
610 | result = pdrv->err_handler-> | |
611 | mmio_enabled(pcidev); | |
612 | break; | |
613 | case XEN_PCI_OP_aer_slotreset: | |
614 | result = pdrv->err_handler-> | |
615 | slot_reset(pcidev); | |
616 | break; | |
617 | case XEN_PCI_OP_aer_resume: | |
618 | pdrv->err_handler->resume(pcidev); | |
619 | break; | |
620 | default: | |
621 | dev_err(&pdev->xdev->dev, | |
622 | "bad request in aer recovery " | |
623 | "operation!\n"); | |
624 | ||
625 | } | |
626 | } | |
627 | } | |
956a9202 RW |
628 | } |
629 | if (!flag) | |
630 | result = PCI_ERS_RESULT_NONE; | |
631 | ||
632 | return result; | |
633 | } | |
634 | ||
635 | ||
636 | static void pcifront_do_aer(struct work_struct *data) | |
637 | { | |
638 | struct pcifront_device *pdev = | |
639 | container_of(data, struct pcifront_device, op_work); | |
640 | int cmd = pdev->sh_info->aer_op.cmd; | |
641 | pci_channel_state_t state = | |
642 | (pci_channel_state_t)pdev->sh_info->aer_op.err; | |
643 | ||
644 | /*If a pci_conf op is in progress, | |
645 | we have to wait until it is done before service aer op*/ | |
646 | dev_dbg(&pdev->xdev->dev, | |
647 | "pcifront service aer bus %x devfn %x\n", | |
648 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); | |
649 | ||
650 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); | |
651 | ||
652 | /* Post the operation to the guest. */ | |
653 | wmb(); | |
654 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); | |
655 | notify_remote_via_evtchn(pdev->evtchn); | |
656 | ||
657 | /*in case of we lost an aer request in four lines time_window*/ | |
658 | smp_mb__before_clear_bit(); | |
659 | clear_bit(_PDEVB_op_active, &pdev->flags); | |
660 | smp_mb__after_clear_bit(); | |
661 | ||
662 | schedule_pcifront_aer_op(pdev); | |
663 | ||
664 | } | |
665 | ||
666 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) | |
667 | { | |
668 | struct pcifront_device *pdev = dev; | |
669 | schedule_pcifront_aer_op(pdev); | |
670 | return IRQ_HANDLED; | |
671 | } | |
3d925320 | 672 | static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) |
956a9202 RW |
673 | { |
674 | int err = 0; | |
675 | ||
676 | spin_lock(&pcifront_dev_lock); | |
677 | ||
678 | if (!pcifront_dev) { | |
679 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); | |
680 | pcifront_dev = pdev; | |
681 | } else { | |
682 | dev_err(&pdev->xdev->dev, "PCI frontend already installed!\n"); | |
683 | err = -EEXIST; | |
684 | } | |
956a9202 RW |
685 | spin_unlock(&pcifront_dev_lock); |
686 | ||
3d925320 KRW |
687 | if (!err && !swiotlb_nr_tbl()) { |
688 | err = pci_xen_swiotlb_init_late(); | |
689 | if (err) | |
690 | dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); | |
691 | } | |
956a9202 RW |
692 | return err; |
693 | } | |
694 | ||
695 | static void pcifront_disconnect(struct pcifront_device *pdev) | |
696 | { | |
697 | spin_lock(&pcifront_dev_lock); | |
698 | ||
699 | if (pdev == pcifront_dev) { | |
700 | dev_info(&pdev->xdev->dev, | |
701 | "Disconnecting PCI Frontend Buses\n"); | |
702 | pcifront_dev = NULL; | |
703 | } | |
704 | ||
705 | spin_unlock(&pcifront_dev_lock); | |
706 | } | |
707 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) | |
708 | { | |
709 | struct pcifront_device *pdev; | |
710 | ||
711 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); | |
712 | if (pdev == NULL) | |
713 | goto out; | |
714 | ||
715 | pdev->sh_info = | |
716 | (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL); | |
717 | if (pdev->sh_info == NULL) { | |
718 | kfree(pdev); | |
719 | pdev = NULL; | |
720 | goto out; | |
721 | } | |
722 | pdev->sh_info->flags = 0; | |
723 | ||
724 | /*Flag for registering PV AER handler*/ | |
725 | set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags); | |
726 | ||
727 | dev_set_drvdata(&xdev->dev, pdev); | |
728 | pdev->xdev = xdev; | |
729 | ||
730 | INIT_LIST_HEAD(&pdev->root_buses); | |
731 | ||
732 | spin_lock_init(&pdev->sh_info_lock); | |
733 | ||
734 | pdev->evtchn = INVALID_EVTCHN; | |
735 | pdev->gnt_ref = INVALID_GRANT_REF; | |
736 | pdev->irq = -1; | |
737 | ||
738 | INIT_WORK(&pdev->op_work, pcifront_do_aer); | |
739 | ||
740 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", | |
741 | pdev, pdev->sh_info); | |
742 | out: | |
743 | return pdev; | |
744 | } | |
745 | ||
746 | static void free_pdev(struct pcifront_device *pdev) | |
747 | { | |
748 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); | |
749 | ||
750 | pcifront_free_roots(pdev); | |
751 | ||
db2e2e6e | 752 | cancel_work_sync(&pdev->op_work); |
956a9202 RW |
753 | |
754 | if (pdev->irq >= 0) | |
755 | unbind_from_irqhandler(pdev->irq, pdev); | |
756 | ||
757 | if (pdev->evtchn != INVALID_EVTCHN) | |
758 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); | |
759 | ||
760 | if (pdev->gnt_ref != INVALID_GRANT_REF) | |
761 | gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */, | |
762 | (unsigned long)pdev->sh_info); | |
763 | else | |
764 | free_page((unsigned long)pdev->sh_info); | |
765 | ||
766 | dev_set_drvdata(&pdev->xdev->dev, NULL); | |
767 | ||
768 | kfree(pdev); | |
769 | } | |
770 | ||
771 | static int pcifront_publish_info(struct pcifront_device *pdev) | |
772 | { | |
773 | int err = 0; | |
774 | struct xenbus_transaction trans; | |
775 | ||
776 | err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info)); | |
777 | if (err < 0) | |
778 | goto out; | |
779 | ||
780 | pdev->gnt_ref = err; | |
781 | ||
782 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); | |
783 | if (err) | |
784 | goto out; | |
785 | ||
786 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, | |
787 | 0, "pcifront", pdev); | |
788 | ||
789 | if (err < 0) | |
790 | return err; | |
791 | ||
792 | pdev->irq = err; | |
793 | ||
794 | do_publish: | |
795 | err = xenbus_transaction_start(&trans); | |
796 | if (err) { | |
797 | xenbus_dev_fatal(pdev->xdev, err, | |
798 | "Error writing configuration for backend " | |
799 | "(start transaction)"); | |
800 | goto out; | |
801 | } | |
802 | ||
803 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
804 | "pci-op-ref", "%u", pdev->gnt_ref); | |
805 | if (!err) | |
806 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
807 | "event-channel", "%u", pdev->evtchn); | |
808 | if (!err) | |
809 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
810 | "magic", XEN_PCI_MAGIC); | |
811 | ||
812 | if (err) { | |
813 | xenbus_transaction_end(trans, 1); | |
814 | xenbus_dev_fatal(pdev->xdev, err, | |
815 | "Error writing configuration for backend"); | |
816 | goto out; | |
817 | } else { | |
818 | err = xenbus_transaction_end(trans, 0); | |
819 | if (err == -EAGAIN) | |
820 | goto do_publish; | |
821 | else if (err) { | |
822 | xenbus_dev_fatal(pdev->xdev, err, | |
823 | "Error completing transaction " | |
824 | "for backend"); | |
825 | goto out; | |
826 | } | |
827 | } | |
828 | ||
829 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | |
830 | ||
831 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); | |
832 | ||
833 | out: | |
834 | return err; | |
835 | } | |
836 | ||
15856ad5 | 837 | static int pcifront_try_connect(struct pcifront_device *pdev) |
956a9202 RW |
838 | { |
839 | int err = -EFAULT; | |
840 | int i, num_roots, len; | |
841 | char str[64]; | |
842 | unsigned int domain, bus; | |
843 | ||
844 | ||
845 | /* Only connect once */ | |
846 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
847 | XenbusStateInitialised) | |
848 | goto out; | |
849 | ||
3d925320 | 850 | err = pcifront_connect_and_init_dma(pdev); |
956a9202 RW |
851 | if (err) { |
852 | xenbus_dev_fatal(pdev->xdev, err, | |
3d925320 | 853 | "Error setting up PCI Frontend"); |
956a9202 RW |
854 | goto out; |
855 | } | |
856 | ||
857 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
858 | "root_num", "%d", &num_roots); | |
859 | if (err == -ENOENT) { | |
860 | xenbus_dev_error(pdev->xdev, err, | |
861 | "No PCI Roots found, trying 0000:00"); | |
862 | err = pcifront_scan_root(pdev, 0, 0); | |
863 | num_roots = 0; | |
864 | } else if (err != 1) { | |
865 | if (err == 0) | |
866 | err = -EINVAL; | |
867 | xenbus_dev_fatal(pdev->xdev, err, | |
868 | "Error reading number of PCI roots"); | |
869 | goto out; | |
870 | } | |
871 | ||
872 | for (i = 0; i < num_roots; i++) { | |
873 | len = snprintf(str, sizeof(str), "root-%d", i); | |
874 | if (unlikely(len >= (sizeof(str) - 1))) { | |
875 | err = -ENOMEM; | |
876 | goto out; | |
877 | } | |
878 | ||
879 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
880 | "%x:%x", &domain, &bus); | |
881 | if (err != 2) { | |
882 | if (err >= 0) | |
883 | err = -EINVAL; | |
884 | xenbus_dev_fatal(pdev->xdev, err, | |
885 | "Error reading PCI root %d", i); | |
886 | goto out; | |
887 | } | |
888 | ||
889 | err = pcifront_scan_root(pdev, domain, bus); | |
890 | if (err) { | |
891 | xenbus_dev_fatal(pdev->xdev, err, | |
892 | "Error scanning PCI root %04x:%02x", | |
893 | domain, bus); | |
894 | goto out; | |
895 | } | |
896 | } | |
897 | ||
898 | err = xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
899 | ||
900 | out: | |
901 | return err; | |
902 | } | |
903 | ||
904 | static int pcifront_try_disconnect(struct pcifront_device *pdev) | |
905 | { | |
906 | int err = 0; | |
907 | enum xenbus_state prev_state; | |
908 | ||
909 | ||
910 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); | |
911 | ||
912 | if (prev_state >= XenbusStateClosing) | |
913 | goto out; | |
914 | ||
915 | if (prev_state == XenbusStateConnected) { | |
916 | pcifront_free_roots(pdev); | |
917 | pcifront_disconnect(pdev); | |
918 | } | |
919 | ||
920 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); | |
921 | ||
922 | out: | |
923 | ||
924 | return err; | |
925 | } | |
926 | ||
15856ad5 | 927 | static int pcifront_attach_devices(struct pcifront_device *pdev) |
956a9202 RW |
928 | { |
929 | int err = -EFAULT; | |
930 | int i, num_roots, len; | |
931 | unsigned int domain, bus; | |
932 | char str[64]; | |
933 | ||
934 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
935 | XenbusStateReconfiguring) | |
936 | goto out; | |
937 | ||
938 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
939 | "root_num", "%d", &num_roots); | |
940 | if (err == -ENOENT) { | |
941 | xenbus_dev_error(pdev->xdev, err, | |
942 | "No PCI Roots found, trying 0000:00"); | |
943 | err = pcifront_rescan_root(pdev, 0, 0); | |
944 | num_roots = 0; | |
945 | } else if (err != 1) { | |
946 | if (err == 0) | |
947 | err = -EINVAL; | |
948 | xenbus_dev_fatal(pdev->xdev, err, | |
949 | "Error reading number of PCI roots"); | |
950 | goto out; | |
951 | } | |
952 | ||
953 | for (i = 0; i < num_roots; i++) { | |
954 | len = snprintf(str, sizeof(str), "root-%d", i); | |
955 | if (unlikely(len >= (sizeof(str) - 1))) { | |
956 | err = -ENOMEM; | |
957 | goto out; | |
958 | } | |
959 | ||
960 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
961 | "%x:%x", &domain, &bus); | |
962 | if (err != 2) { | |
963 | if (err >= 0) | |
964 | err = -EINVAL; | |
965 | xenbus_dev_fatal(pdev->xdev, err, | |
966 | "Error reading PCI root %d", i); | |
967 | goto out; | |
968 | } | |
969 | ||
970 | err = pcifront_rescan_root(pdev, domain, bus); | |
971 | if (err) { | |
972 | xenbus_dev_fatal(pdev->xdev, err, | |
973 | "Error scanning PCI root %04x:%02x", | |
974 | domain, bus); | |
975 | goto out; | |
976 | } | |
977 | } | |
978 | ||
979 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
980 | ||
981 | out: | |
982 | return err; | |
983 | } | |
984 | ||
985 | static int pcifront_detach_devices(struct pcifront_device *pdev) | |
986 | { | |
987 | int err = 0; | |
988 | int i, num_devs; | |
989 | unsigned int domain, bus, slot, func; | |
956a9202 RW |
990 | struct pci_dev *pci_dev; |
991 | char str[64]; | |
992 | ||
993 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
994 | XenbusStateConnected) | |
995 | goto out; | |
996 | ||
997 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", | |
998 | &num_devs); | |
999 | if (err != 1) { | |
1000 | if (err >= 0) | |
1001 | err = -EINVAL; | |
1002 | xenbus_dev_fatal(pdev->xdev, err, | |
1003 | "Error reading number of PCI devices"); | |
1004 | goto out; | |
1005 | } | |
1006 | ||
1007 | /* Find devices being detached and remove them. */ | |
1008 | for (i = 0; i < num_devs; i++) { | |
1009 | int l, state; | |
1010 | l = snprintf(str, sizeof(str), "state-%d", i); | |
1011 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1012 | err = -ENOMEM; | |
1013 | goto out; | |
1014 | } | |
1015 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d", | |
1016 | &state); | |
1017 | if (err != 1) | |
1018 | state = XenbusStateUnknown; | |
1019 | ||
1020 | if (state != XenbusStateClosing) | |
1021 | continue; | |
1022 | ||
1023 | /* Remove device. */ | |
1024 | l = snprintf(str, sizeof(str), "vdev-%d", i); | |
1025 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1026 | err = -ENOMEM; | |
1027 | goto out; | |
1028 | } | |
1029 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
1030 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | |
1031 | if (err != 4) { | |
1032 | if (err >= 0) | |
1033 | err = -EINVAL; | |
1034 | xenbus_dev_fatal(pdev->xdev, err, | |
1035 | "Error reading PCI device %d", i); | |
1036 | goto out; | |
1037 | } | |
1038 | ||
2ccc246d JL |
1039 | pci_dev = pci_get_domain_bus_and_slot(domain, bus, |
1040 | PCI_DEVFN(slot, func)); | |
956a9202 RW |
1041 | if (!pci_dev) { |
1042 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1043 | "Cannot get PCI device %04x:%02x:%02x.%d\n", |
956a9202 RW |
1044 | domain, bus, slot, func); |
1045 | continue; | |
1046 | } | |
210647af | 1047 | pci_stop_and_remove_bus_device(pci_dev); |
956a9202 RW |
1048 | pci_dev_put(pci_dev); |
1049 | ||
1050 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1051 | "PCI device %04x:%02x:%02x.%d removed.\n", |
956a9202 RW |
1052 | domain, bus, slot, func); |
1053 | } | |
1054 | ||
1055 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); | |
1056 | ||
1057 | out: | |
1058 | return err; | |
1059 | } | |
1060 | ||
1061 | static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev, | |
1062 | enum xenbus_state be_state) | |
1063 | { | |
1064 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1065 | ||
1066 | switch (be_state) { | |
1067 | case XenbusStateUnknown: | |
1068 | case XenbusStateInitialising: | |
1069 | case XenbusStateInitWait: | |
1070 | case XenbusStateInitialised: | |
956a9202 RW |
1071 | break; |
1072 | ||
1073 | case XenbusStateConnected: | |
1074 | pcifront_try_connect(pdev); | |
1075 | break; | |
1076 | ||
d5af64de DV |
1077 | case XenbusStateClosed: |
1078 | if (xdev->state == XenbusStateClosed) | |
1079 | break; | |
1080 | /* Missed the backend's CLOSING state -- fallthrough */ | |
956a9202 RW |
1081 | case XenbusStateClosing: |
1082 | dev_warn(&xdev->dev, "backend going away!\n"); | |
1083 | pcifront_try_disconnect(pdev); | |
1084 | break; | |
1085 | ||
1086 | case XenbusStateReconfiguring: | |
1087 | pcifront_detach_devices(pdev); | |
1088 | break; | |
1089 | ||
1090 | case XenbusStateReconfigured: | |
1091 | pcifront_attach_devices(pdev); | |
1092 | break; | |
1093 | } | |
1094 | } | |
1095 | ||
1096 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, | |
1097 | const struct xenbus_device_id *id) | |
1098 | { | |
1099 | int err = 0; | |
1100 | struct pcifront_device *pdev = alloc_pdev(xdev); | |
1101 | ||
1102 | if (pdev == NULL) { | |
1103 | err = -ENOMEM; | |
1104 | xenbus_dev_fatal(xdev, err, | |
1105 | "Error allocating pcifront_device struct"); | |
1106 | goto out; | |
1107 | } | |
1108 | ||
1109 | err = pcifront_publish_info(pdev); | |
1110 | if (err) | |
1111 | free_pdev(pdev); | |
1112 | ||
1113 | out: | |
1114 | return err; | |
1115 | } | |
1116 | ||
1117 | static int pcifront_xenbus_remove(struct xenbus_device *xdev) | |
1118 | { | |
1119 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1120 | if (pdev) | |
1121 | free_pdev(pdev); | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | static const struct xenbus_device_id xenpci_ids[] = { | |
1127 | {"pci"}, | |
1128 | {""}, | |
1129 | }; | |
1130 | ||
73db144b | 1131 | static DEFINE_XENBUS_DRIVER(xenpci, "pcifront", |
956a9202 RW |
1132 | .probe = pcifront_xenbus_probe, |
1133 | .remove = pcifront_xenbus_remove, | |
1134 | .otherend_changed = pcifront_backend_changed, | |
73db144b | 1135 | ); |
956a9202 RW |
1136 | |
1137 | static int __init pcifront_init(void) | |
1138 | { | |
1139 | if (!xen_pv_domain() || xen_initial_domain()) | |
1140 | return -ENODEV; | |
1141 | ||
1142 | pci_frontend_registrar(1 /* enable */); | |
1143 | ||
73db144b | 1144 | return xenbus_register_frontend(&xenpci_driver); |
956a9202 RW |
1145 | } |
1146 | ||
1147 | static void __exit pcifront_cleanup(void) | |
1148 | { | |
73db144b | 1149 | xenbus_unregister_driver(&xenpci_driver); |
956a9202 RW |
1150 | pci_frontend_registrar(0 /* disable */); |
1151 | } | |
1152 | module_init(pcifront_init); | |
1153 | module_exit(pcifront_cleanup); | |
1154 | ||
1155 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); | |
1156 | MODULE_LICENSE("GPL"); | |
1157 | MODULE_ALIAS("xen:pci"); |