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 { | |
d012f713 | 54 | struct pci_sysdata sd; |
956a9202 RW |
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 | { | |
d012f713 KRW |
68 | /* Because we do not expose that information via XenBus. */ |
69 | sd->sd.node = first_online_node; | |
70 | sd->sd.domain = domain; | |
956a9202 RW |
71 | sd->pdev = pdev; |
72 | } | |
73 | ||
74 | static DEFINE_SPINLOCK(pcifront_dev_lock); | |
75 | static struct pcifront_device *pcifront_dev; | |
76 | ||
77 | static int verbose_request; | |
78 | module_param(verbose_request, int, 0644); | |
79 | ||
80 | static int errno_to_pcibios_err(int errno) | |
81 | { | |
82 | switch (errno) { | |
83 | case XEN_PCI_ERR_success: | |
84 | return PCIBIOS_SUCCESSFUL; | |
85 | ||
86 | case XEN_PCI_ERR_dev_not_found: | |
87 | return PCIBIOS_DEVICE_NOT_FOUND; | |
88 | ||
89 | case XEN_PCI_ERR_invalid_offset: | |
90 | case XEN_PCI_ERR_op_failed: | |
91 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
92 | ||
93 | case XEN_PCI_ERR_not_implemented: | |
94 | return PCIBIOS_FUNC_NOT_SUPPORTED; | |
95 | ||
96 | case XEN_PCI_ERR_access_denied: | |
97 | return PCIBIOS_SET_FAILED; | |
98 | } | |
99 | return errno; | |
100 | } | |
101 | ||
102 | static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev) | |
103 | { | |
104 | if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags) | |
105 | && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) { | |
106 | dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n"); | |
107 | schedule_work(&pdev->op_work); | |
108 | } | |
109 | } | |
110 | ||
111 | static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) | |
112 | { | |
113 | int err = 0; | |
114 | struct xen_pci_op *active_op = &pdev->sh_info->op; | |
115 | unsigned long irq_flags; | |
116 | evtchn_port_t port = pdev->evtchn; | |
117 | unsigned irq = pdev->irq; | |
118 | s64 ns, ns_timeout; | |
119 | struct timeval tv; | |
120 | ||
121 | spin_lock_irqsave(&pdev->sh_info_lock, irq_flags); | |
122 | ||
123 | memcpy(active_op, op, sizeof(struct xen_pci_op)); | |
124 | ||
125 | /* Go */ | |
126 | wmb(); | |
127 | set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags); | |
128 | notify_remote_via_evtchn(port); | |
129 | ||
130 | /* | |
131 | * We set a poll timeout of 3 seconds but give up on return after | |
132 | * 2 seconds. It is better to time out too late rather than too early | |
133 | * (in the latter case we end up continually re-executing poll() with a | |
134 | * timeout in the past). 1s difference gives plenty of slack for error. | |
135 | */ | |
136 | do_gettimeofday(&tv); | |
137 | ns_timeout = timeval_to_ns(&tv) + 2 * (s64)NSEC_PER_SEC; | |
138 | ||
139 | xen_clear_irq_pending(irq); | |
140 | ||
141 | while (test_bit(_XEN_PCIF_active, | |
142 | (unsigned long *)&pdev->sh_info->flags)) { | |
143 | xen_poll_irq_timeout(irq, jiffies + 3*HZ); | |
144 | xen_clear_irq_pending(irq); | |
145 | do_gettimeofday(&tv); | |
146 | ns = timeval_to_ns(&tv); | |
147 | if (ns > ns_timeout) { | |
148 | dev_err(&pdev->xdev->dev, | |
149 | "pciback not responding!!!\n"); | |
150 | clear_bit(_XEN_PCIF_active, | |
151 | (unsigned long *)&pdev->sh_info->flags); | |
152 | err = XEN_PCI_ERR_dev_not_found; | |
153 | goto out; | |
154 | } | |
155 | } | |
156 | ||
157 | /* | |
158 | * We might lose backend service request since we | |
159 | * reuse same evtchn with pci_conf backend response. So re-schedule | |
160 | * aer pcifront service. | |
161 | */ | |
162 | if (test_bit(_XEN_PCIB_active, | |
163 | (unsigned long *)&pdev->sh_info->flags)) { | |
164 | dev_err(&pdev->xdev->dev, | |
165 | "schedule aer pcifront service\n"); | |
166 | schedule_pcifront_aer_op(pdev); | |
167 | } | |
168 | ||
169 | memcpy(op, active_op, sizeof(struct xen_pci_op)); | |
170 | ||
171 | err = op->err; | |
172 | out: | |
173 | spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags); | |
174 | return err; | |
175 | } | |
176 | ||
177 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
178 | static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn, | |
179 | int where, int size, u32 *val) | |
180 | { | |
181 | int err = 0; | |
182 | struct xen_pci_op op = { | |
183 | .cmd = XEN_PCI_OP_conf_read, | |
184 | .domain = pci_domain_nr(bus), | |
185 | .bus = bus->number, | |
186 | .devfn = devfn, | |
187 | .offset = where, | |
188 | .size = size, | |
189 | }; | |
190 | struct pcifront_sd *sd = bus->sysdata; | |
191 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
192 | ||
193 | if (verbose_request) | |
194 | dev_info(&pdev->xdev->dev, | |
e4de866a | 195 | "read dev=%04x:%02x:%02x.%d - offset %x size %d\n", |
956a9202 RW |
196 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), |
197 | PCI_FUNC(devfn), where, size); | |
198 | ||
199 | err = do_pci_op(pdev, &op); | |
200 | ||
201 | if (likely(!err)) { | |
202 | if (verbose_request) | |
203 | dev_info(&pdev->xdev->dev, "read got back value %x\n", | |
204 | op.value); | |
205 | ||
206 | *val = op.value; | |
207 | } else if (err == -ENODEV) { | |
208 | /* No device here, pretend that it just returned 0 */ | |
209 | err = 0; | |
210 | *val = 0; | |
211 | } | |
212 | ||
213 | return errno_to_pcibios_err(err); | |
214 | } | |
215 | ||
216 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
217 | static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn, | |
218 | int where, int size, u32 val) | |
219 | { | |
220 | struct xen_pci_op op = { | |
221 | .cmd = XEN_PCI_OP_conf_write, | |
222 | .domain = pci_domain_nr(bus), | |
223 | .bus = bus->number, | |
224 | .devfn = devfn, | |
225 | .offset = where, | |
226 | .size = size, | |
227 | .value = val, | |
228 | }; | |
229 | struct pcifront_sd *sd = bus->sysdata; | |
230 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
231 | ||
232 | if (verbose_request) | |
233 | dev_info(&pdev->xdev->dev, | |
e4de866a | 234 | "write dev=%04x:%02x:%02x.%d - " |
956a9202 RW |
235 | "offset %x size %d val %x\n", |
236 | pci_domain_nr(bus), bus->number, | |
237 | PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); | |
238 | ||
239 | return errno_to_pcibios_err(do_pci_op(pdev, &op)); | |
240 | } | |
241 | ||
b8b0f559 | 242 | static struct pci_ops pcifront_bus_ops = { |
956a9202 RW |
243 | .read = pcifront_bus_read, |
244 | .write = pcifront_bus_write, | |
245 | }; | |
246 | ||
247 | #ifdef CONFIG_PCI_MSI | |
248 | static int pci_frontend_enable_msix(struct pci_dev *dev, | |
cc0f89c4 | 249 | int vector[], int nvec) |
956a9202 RW |
250 | { |
251 | int err; | |
252 | int i; | |
253 | struct xen_pci_op op = { | |
254 | .cmd = XEN_PCI_OP_enable_msix, | |
255 | .domain = pci_domain_nr(dev->bus), | |
256 | .bus = dev->bus->number, | |
257 | .devfn = dev->devfn, | |
258 | .value = nvec, | |
259 | }; | |
260 | struct pcifront_sd *sd = dev->bus->sysdata; | |
261 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
262 | struct msi_desc *entry; | |
263 | ||
264 | if (nvec > SH_INFO_MAX_VEC) { | |
265 | dev_err(&dev->dev, "too much vector for pci frontend: %x." | |
266 | " Increase SH_INFO_MAX_VEC.\n", nvec); | |
267 | return -EINVAL; | |
268 | } | |
269 | ||
270 | i = 0; | |
271 | list_for_each_entry(entry, &dev->msi_list, list) { | |
272 | op.msix_entries[i].entry = entry->msi_attrib.entry_nr; | |
273 | /* Vector is useless at this point. */ | |
274 | op.msix_entries[i].vector = -1; | |
275 | i++; | |
276 | } | |
277 | ||
278 | err = do_pci_op(pdev, &op); | |
279 | ||
280 | if (likely(!err)) { | |
281 | if (likely(!op.value)) { | |
282 | /* we get the result */ | |
1d461052 KRW |
283 | for (i = 0; i < nvec; i++) { |
284 | if (op.msix_entries[i].vector <= 0) { | |
285 | dev_warn(&dev->dev, "MSI-X entry %d is invalid: %d!\n", | |
286 | i, op.msix_entries[i].vector); | |
287 | err = -EINVAL; | |
cc0f89c4 | 288 | vector[i] = -1; |
1d461052 KRW |
289 | continue; |
290 | } | |
cc0f89c4 | 291 | vector[i] = op.msix_entries[i].vector; |
1d461052 | 292 | } |
956a9202 RW |
293 | } else { |
294 | printk(KERN_DEBUG "enable msix get value %x\n", | |
295 | op.value); | |
f09d8432 | 296 | err = op.value; |
956a9202 RW |
297 | } |
298 | } else { | |
299 | dev_err(&dev->dev, "enable msix get err %x\n", err); | |
956a9202 | 300 | } |
1d461052 | 301 | return err; |
956a9202 RW |
302 | } |
303 | ||
304 | static void pci_frontend_disable_msix(struct pci_dev *dev) | |
305 | { | |
306 | int err; | |
307 | struct xen_pci_op op = { | |
308 | .cmd = XEN_PCI_OP_disable_msix, | |
309 | .domain = pci_domain_nr(dev->bus), | |
310 | .bus = dev->bus->number, | |
311 | .devfn = dev->devfn, | |
312 | }; | |
313 | struct pcifront_sd *sd = dev->bus->sysdata; | |
314 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
315 | ||
316 | err = do_pci_op(pdev, &op); | |
317 | ||
318 | /* What should do for error ? */ | |
319 | if (err) | |
320 | dev_err(&dev->dev, "pci_disable_msix get err %x\n", err); | |
321 | } | |
322 | ||
cc0f89c4 | 323 | static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[]) |
956a9202 RW |
324 | { |
325 | int err; | |
326 | struct xen_pci_op op = { | |
327 | .cmd = XEN_PCI_OP_enable_msi, | |
328 | .domain = pci_domain_nr(dev->bus), | |
329 | .bus = dev->bus->number, | |
330 | .devfn = dev->devfn, | |
331 | }; | |
332 | struct pcifront_sd *sd = dev->bus->sysdata; | |
333 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
334 | ||
335 | err = do_pci_op(pdev, &op); | |
336 | if (likely(!err)) { | |
cc0f89c4 | 337 | vector[0] = op.value; |
1d461052 KRW |
338 | if (op.value <= 0) { |
339 | dev_warn(&dev->dev, "MSI entry is invalid: %d!\n", | |
340 | op.value); | |
341 | err = -EINVAL; | |
cc0f89c4 | 342 | vector[0] = -1; |
1d461052 | 343 | } |
956a9202 RW |
344 | } else { |
345 | dev_err(&dev->dev, "pci frontend enable msi failed for dev " | |
346 | "%x:%x\n", op.bus, op.devfn); | |
347 | err = -EINVAL; | |
348 | } | |
349 | return err; | |
350 | } | |
351 | ||
352 | static void pci_frontend_disable_msi(struct pci_dev *dev) | |
353 | { | |
354 | int err; | |
355 | struct xen_pci_op op = { | |
356 | .cmd = XEN_PCI_OP_disable_msi, | |
357 | .domain = pci_domain_nr(dev->bus), | |
358 | .bus = dev->bus->number, | |
359 | .devfn = dev->devfn, | |
360 | }; | |
361 | struct pcifront_sd *sd = dev->bus->sysdata; | |
362 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
363 | ||
364 | err = do_pci_op(pdev, &op); | |
365 | if (err == XEN_PCI_ERR_dev_not_found) { | |
366 | /* XXX No response from backend, what shall we do? */ | |
367 | printk(KERN_DEBUG "get no response from backend for disable MSI\n"); | |
368 | return; | |
369 | } | |
370 | if (err) | |
371 | /* how can pciback notify us fail? */ | |
372 | printk(KERN_DEBUG "get fake response frombackend\n"); | |
373 | } | |
374 | ||
375 | static struct xen_pci_frontend_ops pci_frontend_ops = { | |
376 | .enable_msi = pci_frontend_enable_msi, | |
377 | .disable_msi = pci_frontend_disable_msi, | |
378 | .enable_msix = pci_frontend_enable_msix, | |
379 | .disable_msix = pci_frontend_disable_msix, | |
380 | }; | |
381 | ||
382 | static void pci_frontend_registrar(int enable) | |
383 | { | |
384 | if (enable) | |
385 | xen_pci_frontend = &pci_frontend_ops; | |
386 | else | |
387 | xen_pci_frontend = NULL; | |
388 | }; | |
389 | #else | |
390 | static inline void pci_frontend_registrar(int enable) { }; | |
391 | #endif /* CONFIG_PCI_MSI */ | |
392 | ||
393 | /* Claim resources for the PCI frontend as-is, backend won't allow changes */ | |
394 | static int pcifront_claim_resource(struct pci_dev *dev, void *data) | |
395 | { | |
396 | struct pcifront_device *pdev = data; | |
397 | int i; | |
398 | struct resource *r; | |
399 | ||
400 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
401 | r = &dev->resource[i]; | |
402 | ||
403 | if (!r->parent && r->start && r->flags) { | |
404 | dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n", | |
405 | pci_name(dev), i); | |
406 | if (pci_claim_resource(dev, i)) { | |
917e3e65 KRW |
407 | dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! " |
408 | "Device offline. Try using e820_host=1 in the guest config.\n", | |
956a9202 RW |
409 | pci_name(dev), i); |
410 | } | |
411 | } | |
412 | } | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
15856ad5 | 417 | static int pcifront_scan_bus(struct pcifront_device *pdev, |
956a9202 RW |
418 | unsigned int domain, unsigned int bus, |
419 | struct pci_bus *b) | |
420 | { | |
421 | struct pci_dev *d; | |
422 | unsigned int devfn; | |
423 | ||
424 | /* Scan the bus for functions and add. | |
425 | * We omit handling of PCI bridge attachment because pciback prevents | |
426 | * bridges from being exported. | |
427 | */ | |
428 | for (devfn = 0; devfn < 0x100; devfn++) { | |
429 | d = pci_get_slot(b, devfn); | |
430 | if (d) { | |
431 | /* Device is already known. */ | |
432 | pci_dev_put(d); | |
433 | continue; | |
434 | } | |
435 | ||
436 | d = pci_scan_single_device(b, devfn); | |
437 | if (d) | |
438 | dev_info(&pdev->xdev->dev, "New device on " | |
e4de866a | 439 | "%04x:%02x:%02x.%d found.\n", domain, bus, |
956a9202 RW |
440 | PCI_SLOT(devfn), PCI_FUNC(devfn)); |
441 | } | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
15856ad5 | 446 | static int pcifront_scan_root(struct pcifront_device *pdev, |
956a9202 RW |
447 | unsigned int domain, unsigned int bus) |
448 | { | |
449 | struct pci_bus *b; | |
450 | struct pcifront_sd *sd = NULL; | |
451 | struct pci_bus_entry *bus_entry = NULL; | |
452 | int err = 0; | |
453 | ||
454 | #ifndef CONFIG_PCI_DOMAINS | |
455 | if (domain != 0) { | |
456 | dev_err(&pdev->xdev->dev, | |
457 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
458 | dev_err(&pdev->xdev->dev, | |
459 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
460 | err = -EINVAL; | |
461 | goto err_out; | |
462 | } | |
463 | #endif | |
464 | ||
465 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", | |
466 | domain, bus); | |
467 | ||
d012f713 KRW |
468 | bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL); |
469 | sd = kzalloc(sizeof(*sd), GFP_KERNEL); | |
956a9202 RW |
470 | if (!bus_entry || !sd) { |
471 | err = -ENOMEM; | |
472 | goto err_out; | |
473 | } | |
474 | pcifront_init_sd(sd, domain, bus, pdev); | |
475 | ||
476 | b = pci_scan_bus_parented(&pdev->xdev->dev, bus, | |
477 | &pcifront_bus_ops, sd); | |
478 | if (!b) { | |
479 | dev_err(&pdev->xdev->dev, | |
480 | "Error creating PCI Frontend Bus!\n"); | |
481 | err = -ENOMEM; | |
482 | goto err_out; | |
483 | } | |
484 | ||
485 | bus_entry->bus = b; | |
486 | ||
487 | list_add(&bus_entry->list, &pdev->root_buses); | |
488 | ||
489 | /* pci_scan_bus_parented skips devices which do not have a have | |
490 | * devfn==0. The pcifront_scan_bus enumerates all devfn. */ | |
491 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
492 | ||
493 | /* Claim resources before going "live" with our devices */ | |
494 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
495 | ||
496 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
497 | pci_bus_add_devices(b); | |
498 | ||
499 | return err; | |
500 | ||
501 | err_out: | |
502 | kfree(bus_entry); | |
503 | kfree(sd); | |
504 | ||
505 | return err; | |
506 | } | |
507 | ||
15856ad5 | 508 | static int pcifront_rescan_root(struct pcifront_device *pdev, |
956a9202 RW |
509 | unsigned int domain, unsigned int bus) |
510 | { | |
511 | int err; | |
512 | struct pci_bus *b; | |
513 | ||
514 | #ifndef CONFIG_PCI_DOMAINS | |
515 | if (domain != 0) { | |
516 | dev_err(&pdev->xdev->dev, | |
517 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
518 | dev_err(&pdev->xdev->dev, | |
519 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
520 | return -EINVAL; | |
521 | } | |
522 | #endif | |
523 | ||
524 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", | |
525 | domain, bus); | |
526 | ||
527 | b = pci_find_bus(domain, bus); | |
528 | if (!b) | |
529 | /* If the bus is unknown, create it. */ | |
530 | return pcifront_scan_root(pdev, domain, bus); | |
531 | ||
532 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
533 | ||
534 | /* Claim resources before going "live" with our devices */ | |
535 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
536 | ||
537 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
538 | pci_bus_add_devices(b); | |
539 | ||
540 | return err; | |
541 | } | |
542 | ||
543 | static void free_root_bus_devs(struct pci_bus *bus) | |
544 | { | |
545 | struct pci_dev *dev; | |
546 | ||
547 | while (!list_empty(&bus->devices)) { | |
548 | dev = container_of(bus->devices.next, struct pci_dev, | |
549 | bus_list); | |
550 | dev_dbg(&dev->dev, "removing device\n"); | |
210647af | 551 | pci_stop_and_remove_bus_device(dev); |
956a9202 RW |
552 | } |
553 | } | |
554 | ||
555 | static void pcifront_free_roots(struct pcifront_device *pdev) | |
556 | { | |
557 | struct pci_bus_entry *bus_entry, *t; | |
558 | ||
559 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); | |
560 | ||
561 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { | |
562 | list_del(&bus_entry->list); | |
563 | ||
564 | free_root_bus_devs(bus_entry->bus); | |
565 | ||
566 | kfree(bus_entry->bus->sysdata); | |
567 | ||
568 | device_unregister(bus_entry->bus->bridge); | |
569 | pci_remove_bus(bus_entry->bus); | |
570 | ||
571 | kfree(bus_entry); | |
572 | } | |
573 | } | |
574 | ||
575 | static pci_ers_result_t pcifront_common_process(int cmd, | |
576 | struct pcifront_device *pdev, | |
577 | pci_channel_state_t state) | |
578 | { | |
579 | pci_ers_result_t result; | |
580 | struct pci_driver *pdrv; | |
581 | int bus = pdev->sh_info->aer_op.bus; | |
582 | int devfn = pdev->sh_info->aer_op.devfn; | |
583 | struct pci_dev *pcidev; | |
584 | int flag = 0; | |
585 | ||
586 | dev_dbg(&pdev->xdev->dev, | |
587 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", | |
588 | cmd, bus, devfn); | |
589 | result = PCI_ERS_RESULT_NONE; | |
590 | ||
591 | pcidev = pci_get_bus_and_slot(bus, devfn); | |
592 | if (!pcidev || !pcidev->driver) { | |
2a63dd72 JS |
593 | dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); |
594 | if (pcidev) | |
595 | pci_dev_put(pcidev); | |
956a9202 RW |
596 | return result; |
597 | } | |
598 | pdrv = pcidev->driver; | |
599 | ||
07d25146 | 600 | if (pdrv) { |
956a9202 RW |
601 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { |
602 | dev_dbg(&pcidev->dev, | |
603 | "trying to call AER service\n"); | |
604 | if (pcidev) { | |
605 | flag = 1; | |
606 | switch (cmd) { | |
607 | case XEN_PCI_OP_aer_detected: | |
608 | result = pdrv->err_handler-> | |
609 | error_detected(pcidev, state); | |
610 | break; | |
611 | case XEN_PCI_OP_aer_mmio: | |
612 | result = pdrv->err_handler-> | |
613 | mmio_enabled(pcidev); | |
614 | break; | |
615 | case XEN_PCI_OP_aer_slotreset: | |
616 | result = pdrv->err_handler-> | |
617 | slot_reset(pcidev); | |
618 | break; | |
619 | case XEN_PCI_OP_aer_resume: | |
620 | pdrv->err_handler->resume(pcidev); | |
621 | break; | |
622 | default: | |
623 | dev_err(&pdev->xdev->dev, | |
624 | "bad request in aer recovery " | |
625 | "operation!\n"); | |
626 | ||
627 | } | |
628 | } | |
629 | } | |
956a9202 RW |
630 | } |
631 | if (!flag) | |
632 | result = PCI_ERS_RESULT_NONE; | |
633 | ||
634 | return result; | |
635 | } | |
636 | ||
637 | ||
638 | static void pcifront_do_aer(struct work_struct *data) | |
639 | { | |
640 | struct pcifront_device *pdev = | |
641 | container_of(data, struct pcifront_device, op_work); | |
642 | int cmd = pdev->sh_info->aer_op.cmd; | |
643 | pci_channel_state_t state = | |
644 | (pci_channel_state_t)pdev->sh_info->aer_op.err; | |
645 | ||
646 | /*If a pci_conf op is in progress, | |
647 | we have to wait until it is done before service aer op*/ | |
648 | dev_dbg(&pdev->xdev->dev, | |
649 | "pcifront service aer bus %x devfn %x\n", | |
650 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); | |
651 | ||
652 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); | |
653 | ||
654 | /* Post the operation to the guest. */ | |
655 | wmb(); | |
656 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); | |
657 | notify_remote_via_evtchn(pdev->evtchn); | |
658 | ||
659 | /*in case of we lost an aer request in four lines time_window*/ | |
660 | smp_mb__before_clear_bit(); | |
661 | clear_bit(_PDEVB_op_active, &pdev->flags); | |
662 | smp_mb__after_clear_bit(); | |
663 | ||
664 | schedule_pcifront_aer_op(pdev); | |
665 | ||
666 | } | |
667 | ||
668 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) | |
669 | { | |
670 | struct pcifront_device *pdev = dev; | |
671 | schedule_pcifront_aer_op(pdev); | |
672 | return IRQ_HANDLED; | |
673 | } | |
3d925320 | 674 | static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) |
956a9202 RW |
675 | { |
676 | int err = 0; | |
677 | ||
678 | spin_lock(&pcifront_dev_lock); | |
679 | ||
680 | if (!pcifront_dev) { | |
681 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); | |
682 | pcifront_dev = pdev; | |
9ceb896c | 683 | } else |
956a9202 | 684 | err = -EEXIST; |
9ceb896c | 685 | |
956a9202 RW |
686 | spin_unlock(&pcifront_dev_lock); |
687 | ||
3d925320 KRW |
688 | if (!err && !swiotlb_nr_tbl()) { |
689 | err = pci_xen_swiotlb_init_late(); | |
690 | if (err) | |
691 | dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); | |
692 | } | |
956a9202 RW |
693 | return err; |
694 | } | |
695 | ||
696 | static void pcifront_disconnect(struct pcifront_device *pdev) | |
697 | { | |
698 | spin_lock(&pcifront_dev_lock); | |
699 | ||
700 | if (pdev == pcifront_dev) { | |
701 | dev_info(&pdev->xdev->dev, | |
702 | "Disconnecting PCI Frontend Buses\n"); | |
703 | pcifront_dev = NULL; | |
704 | } | |
705 | ||
706 | spin_unlock(&pcifront_dev_lock); | |
707 | } | |
708 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) | |
709 | { | |
710 | struct pcifront_device *pdev; | |
711 | ||
712 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); | |
713 | if (pdev == NULL) | |
714 | goto out; | |
715 | ||
716 | pdev->sh_info = | |
717 | (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL); | |
718 | if (pdev->sh_info == NULL) { | |
719 | kfree(pdev); | |
720 | pdev = NULL; | |
721 | goto out; | |
722 | } | |
723 | pdev->sh_info->flags = 0; | |
724 | ||
725 | /*Flag for registering PV AER handler*/ | |
726 | set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags); | |
727 | ||
728 | dev_set_drvdata(&xdev->dev, pdev); | |
729 | pdev->xdev = xdev; | |
730 | ||
731 | INIT_LIST_HEAD(&pdev->root_buses); | |
732 | ||
733 | spin_lock_init(&pdev->sh_info_lock); | |
734 | ||
735 | pdev->evtchn = INVALID_EVTCHN; | |
736 | pdev->gnt_ref = INVALID_GRANT_REF; | |
737 | pdev->irq = -1; | |
738 | ||
739 | INIT_WORK(&pdev->op_work, pcifront_do_aer); | |
740 | ||
741 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", | |
742 | pdev, pdev->sh_info); | |
743 | out: | |
744 | return pdev; | |
745 | } | |
746 | ||
747 | static void free_pdev(struct pcifront_device *pdev) | |
748 | { | |
749 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); | |
750 | ||
751 | pcifront_free_roots(pdev); | |
752 | ||
db2e2e6e | 753 | cancel_work_sync(&pdev->op_work); |
956a9202 RW |
754 | |
755 | if (pdev->irq >= 0) | |
756 | unbind_from_irqhandler(pdev->irq, pdev); | |
757 | ||
758 | if (pdev->evtchn != INVALID_EVTCHN) | |
759 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); | |
760 | ||
761 | if (pdev->gnt_ref != INVALID_GRANT_REF) | |
762 | gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */, | |
763 | (unsigned long)pdev->sh_info); | |
764 | else | |
765 | free_page((unsigned long)pdev->sh_info); | |
766 | ||
767 | dev_set_drvdata(&pdev->xdev->dev, NULL); | |
768 | ||
769 | kfree(pdev); | |
770 | } | |
771 | ||
772 | static int pcifront_publish_info(struct pcifront_device *pdev) | |
773 | { | |
774 | int err = 0; | |
775 | struct xenbus_transaction trans; | |
776 | ||
777 | err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info)); | |
778 | if (err < 0) | |
779 | goto out; | |
780 | ||
781 | pdev->gnt_ref = err; | |
782 | ||
783 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); | |
784 | if (err) | |
785 | goto out; | |
786 | ||
787 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, | |
788 | 0, "pcifront", pdev); | |
789 | ||
790 | if (err < 0) | |
791 | return err; | |
792 | ||
793 | pdev->irq = err; | |
794 | ||
795 | do_publish: | |
796 | err = xenbus_transaction_start(&trans); | |
797 | if (err) { | |
798 | xenbus_dev_fatal(pdev->xdev, err, | |
799 | "Error writing configuration for backend " | |
800 | "(start transaction)"); | |
801 | goto out; | |
802 | } | |
803 | ||
804 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
805 | "pci-op-ref", "%u", pdev->gnt_ref); | |
806 | if (!err) | |
807 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
808 | "event-channel", "%u", pdev->evtchn); | |
809 | if (!err) | |
810 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
811 | "magic", XEN_PCI_MAGIC); | |
812 | ||
813 | if (err) { | |
814 | xenbus_transaction_end(trans, 1); | |
815 | xenbus_dev_fatal(pdev->xdev, err, | |
816 | "Error writing configuration for backend"); | |
817 | goto out; | |
818 | } else { | |
819 | err = xenbus_transaction_end(trans, 0); | |
820 | if (err == -EAGAIN) | |
821 | goto do_publish; | |
822 | else if (err) { | |
823 | xenbus_dev_fatal(pdev->xdev, err, | |
824 | "Error completing transaction " | |
825 | "for backend"); | |
826 | goto out; | |
827 | } | |
828 | } | |
829 | ||
830 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | |
831 | ||
832 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); | |
833 | ||
834 | out: | |
835 | return err; | |
836 | } | |
837 | ||
15856ad5 | 838 | static int pcifront_try_connect(struct pcifront_device *pdev) |
956a9202 RW |
839 | { |
840 | int err = -EFAULT; | |
841 | int i, num_roots, len; | |
842 | char str[64]; | |
843 | unsigned int domain, bus; | |
844 | ||
845 | ||
846 | /* Only connect once */ | |
847 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
848 | XenbusStateInitialised) | |
849 | goto out; | |
850 | ||
3d925320 | 851 | err = pcifront_connect_and_init_dma(pdev); |
9ceb896c | 852 | if (err && err != -EEXIST) { |
956a9202 | 853 | xenbus_dev_fatal(pdev->xdev, err, |
3d925320 | 854 | "Error setting up PCI Frontend"); |
956a9202 RW |
855 | goto out; |
856 | } | |
857 | ||
858 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
859 | "root_num", "%d", &num_roots); | |
860 | if (err == -ENOENT) { | |
861 | xenbus_dev_error(pdev->xdev, err, | |
862 | "No PCI Roots found, trying 0000:00"); | |
863 | err = pcifront_scan_root(pdev, 0, 0); | |
864 | num_roots = 0; | |
865 | } else if (err != 1) { | |
866 | if (err == 0) | |
867 | err = -EINVAL; | |
868 | xenbus_dev_fatal(pdev->xdev, err, | |
869 | "Error reading number of PCI roots"); | |
870 | goto out; | |
871 | } | |
872 | ||
873 | for (i = 0; i < num_roots; i++) { | |
874 | len = snprintf(str, sizeof(str), "root-%d", i); | |
875 | if (unlikely(len >= (sizeof(str) - 1))) { | |
876 | err = -ENOMEM; | |
877 | goto out; | |
878 | } | |
879 | ||
880 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
881 | "%x:%x", &domain, &bus); | |
882 | if (err != 2) { | |
883 | if (err >= 0) | |
884 | err = -EINVAL; | |
885 | xenbus_dev_fatal(pdev->xdev, err, | |
886 | "Error reading PCI root %d", i); | |
887 | goto out; | |
888 | } | |
889 | ||
890 | err = pcifront_scan_root(pdev, domain, bus); | |
891 | if (err) { | |
892 | xenbus_dev_fatal(pdev->xdev, err, | |
893 | "Error scanning PCI root %04x:%02x", | |
894 | domain, bus); | |
895 | goto out; | |
896 | } | |
897 | } | |
898 | ||
899 | err = xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
900 | ||
901 | out: | |
902 | return err; | |
903 | } | |
904 | ||
905 | static int pcifront_try_disconnect(struct pcifront_device *pdev) | |
906 | { | |
907 | int err = 0; | |
908 | enum xenbus_state prev_state; | |
909 | ||
910 | ||
911 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); | |
912 | ||
913 | if (prev_state >= XenbusStateClosing) | |
914 | goto out; | |
915 | ||
916 | if (prev_state == XenbusStateConnected) { | |
917 | pcifront_free_roots(pdev); | |
918 | pcifront_disconnect(pdev); | |
919 | } | |
920 | ||
921 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); | |
922 | ||
923 | out: | |
924 | ||
925 | return err; | |
926 | } | |
927 | ||
15856ad5 | 928 | static int pcifront_attach_devices(struct pcifront_device *pdev) |
956a9202 RW |
929 | { |
930 | int err = -EFAULT; | |
931 | int i, num_roots, len; | |
932 | unsigned int domain, bus; | |
933 | char str[64]; | |
934 | ||
935 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
936 | XenbusStateReconfiguring) | |
937 | goto out; | |
938 | ||
939 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
940 | "root_num", "%d", &num_roots); | |
941 | if (err == -ENOENT) { | |
942 | xenbus_dev_error(pdev->xdev, err, | |
943 | "No PCI Roots found, trying 0000:00"); | |
944 | err = pcifront_rescan_root(pdev, 0, 0); | |
945 | num_roots = 0; | |
946 | } else if (err != 1) { | |
947 | if (err == 0) | |
948 | err = -EINVAL; | |
949 | xenbus_dev_fatal(pdev->xdev, err, | |
950 | "Error reading number of PCI roots"); | |
951 | goto out; | |
952 | } | |
953 | ||
954 | for (i = 0; i < num_roots; i++) { | |
955 | len = snprintf(str, sizeof(str), "root-%d", i); | |
956 | if (unlikely(len >= (sizeof(str) - 1))) { | |
957 | err = -ENOMEM; | |
958 | goto out; | |
959 | } | |
960 | ||
961 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
962 | "%x:%x", &domain, &bus); | |
963 | if (err != 2) { | |
964 | if (err >= 0) | |
965 | err = -EINVAL; | |
966 | xenbus_dev_fatal(pdev->xdev, err, | |
967 | "Error reading PCI root %d", i); | |
968 | goto out; | |
969 | } | |
970 | ||
971 | err = pcifront_rescan_root(pdev, domain, bus); | |
972 | if (err) { | |
973 | xenbus_dev_fatal(pdev->xdev, err, | |
974 | "Error scanning PCI root %04x:%02x", | |
975 | domain, bus); | |
976 | goto out; | |
977 | } | |
978 | } | |
979 | ||
980 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
981 | ||
982 | out: | |
983 | return err; | |
984 | } | |
985 | ||
986 | static int pcifront_detach_devices(struct pcifront_device *pdev) | |
987 | { | |
988 | int err = 0; | |
989 | int i, num_devs; | |
990 | unsigned int domain, bus, slot, func; | |
956a9202 RW |
991 | struct pci_dev *pci_dev; |
992 | char str[64]; | |
993 | ||
994 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
995 | XenbusStateConnected) | |
996 | goto out; | |
997 | ||
998 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", | |
999 | &num_devs); | |
1000 | if (err != 1) { | |
1001 | if (err >= 0) | |
1002 | err = -EINVAL; | |
1003 | xenbus_dev_fatal(pdev->xdev, err, | |
1004 | "Error reading number of PCI devices"); | |
1005 | goto out; | |
1006 | } | |
1007 | ||
1008 | /* Find devices being detached and remove them. */ | |
1009 | for (i = 0; i < num_devs; i++) { | |
1010 | int l, state; | |
1011 | l = snprintf(str, sizeof(str), "state-%d", i); | |
1012 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1013 | err = -ENOMEM; | |
1014 | goto out; | |
1015 | } | |
1016 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d", | |
1017 | &state); | |
1018 | if (err != 1) | |
1019 | state = XenbusStateUnknown; | |
1020 | ||
1021 | if (state != XenbusStateClosing) | |
1022 | continue; | |
1023 | ||
1024 | /* Remove device. */ | |
1025 | l = snprintf(str, sizeof(str), "vdev-%d", i); | |
1026 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1027 | err = -ENOMEM; | |
1028 | goto out; | |
1029 | } | |
1030 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
1031 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | |
1032 | if (err != 4) { | |
1033 | if (err >= 0) | |
1034 | err = -EINVAL; | |
1035 | xenbus_dev_fatal(pdev->xdev, err, | |
1036 | "Error reading PCI device %d", i); | |
1037 | goto out; | |
1038 | } | |
1039 | ||
2ccc246d JL |
1040 | pci_dev = pci_get_domain_bus_and_slot(domain, bus, |
1041 | PCI_DEVFN(slot, func)); | |
956a9202 RW |
1042 | if (!pci_dev) { |
1043 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1044 | "Cannot get PCI device %04x:%02x:%02x.%d\n", |
956a9202 RW |
1045 | domain, bus, slot, func); |
1046 | continue; | |
1047 | } | |
210647af | 1048 | pci_stop_and_remove_bus_device(pci_dev); |
956a9202 RW |
1049 | pci_dev_put(pci_dev); |
1050 | ||
1051 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1052 | "PCI device %04x:%02x:%02x.%d removed.\n", |
956a9202 RW |
1053 | domain, bus, slot, func); |
1054 | } | |
1055 | ||
1056 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); | |
1057 | ||
1058 | out: | |
1059 | return err; | |
1060 | } | |
1061 | ||
1062 | static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev, | |
1063 | enum xenbus_state be_state) | |
1064 | { | |
1065 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1066 | ||
1067 | switch (be_state) { | |
1068 | case XenbusStateUnknown: | |
1069 | case XenbusStateInitialising: | |
1070 | case XenbusStateInitWait: | |
1071 | case XenbusStateInitialised: | |
956a9202 RW |
1072 | break; |
1073 | ||
1074 | case XenbusStateConnected: | |
1075 | pcifront_try_connect(pdev); | |
1076 | break; | |
1077 | ||
d5af64de DV |
1078 | case XenbusStateClosed: |
1079 | if (xdev->state == XenbusStateClosed) | |
1080 | break; | |
1081 | /* Missed the backend's CLOSING state -- fallthrough */ | |
956a9202 RW |
1082 | case XenbusStateClosing: |
1083 | dev_warn(&xdev->dev, "backend going away!\n"); | |
1084 | pcifront_try_disconnect(pdev); | |
1085 | break; | |
1086 | ||
1087 | case XenbusStateReconfiguring: | |
1088 | pcifront_detach_devices(pdev); | |
1089 | break; | |
1090 | ||
1091 | case XenbusStateReconfigured: | |
1092 | pcifront_attach_devices(pdev); | |
1093 | break; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, | |
1098 | const struct xenbus_device_id *id) | |
1099 | { | |
1100 | int err = 0; | |
1101 | struct pcifront_device *pdev = alloc_pdev(xdev); | |
1102 | ||
1103 | if (pdev == NULL) { | |
1104 | err = -ENOMEM; | |
1105 | xenbus_dev_fatal(xdev, err, | |
1106 | "Error allocating pcifront_device struct"); | |
1107 | goto out; | |
1108 | } | |
1109 | ||
1110 | err = pcifront_publish_info(pdev); | |
1111 | if (err) | |
1112 | free_pdev(pdev); | |
1113 | ||
1114 | out: | |
1115 | return err; | |
1116 | } | |
1117 | ||
1118 | static int pcifront_xenbus_remove(struct xenbus_device *xdev) | |
1119 | { | |
1120 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1121 | if (pdev) | |
1122 | free_pdev(pdev); | |
1123 | ||
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static const struct xenbus_device_id xenpci_ids[] = { | |
1128 | {"pci"}, | |
1129 | {""}, | |
1130 | }; | |
1131 | ||
73db144b | 1132 | static DEFINE_XENBUS_DRIVER(xenpci, "pcifront", |
956a9202 RW |
1133 | .probe = pcifront_xenbus_probe, |
1134 | .remove = pcifront_xenbus_remove, | |
1135 | .otherend_changed = pcifront_backend_changed, | |
73db144b | 1136 | ); |
956a9202 RW |
1137 | |
1138 | static int __init pcifront_init(void) | |
1139 | { | |
1140 | if (!xen_pv_domain() || xen_initial_domain()) | |
1141 | return -ENODEV; | |
1142 | ||
1143 | pci_frontend_registrar(1 /* enable */); | |
1144 | ||
73db144b | 1145 | return xenbus_register_frontend(&xenpci_driver); |
956a9202 RW |
1146 | } |
1147 | ||
1148 | static void __exit pcifront_cleanup(void) | |
1149 | { | |
73db144b | 1150 | xenbus_unregister_driver(&xenpci_driver); |
956a9202 RW |
1151 | pci_frontend_registrar(0 /* disable */); |
1152 | } | |
1153 | module_init(pcifront_init); | |
1154 | module_exit(pcifront_cleanup); | |
1155 | ||
1156 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); | |
1157 | MODULE_LICENSE("GPL"); | |
1158 | MODULE_ALIAS("xen:pci"); |