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> | |
51c71a3b | 23 | #include <xen/platform_pci.h> |
956a9202 | 24 | |
3d925320 | 25 | #include <asm/xen/swiotlb-xen.h> |
956a9202 RW |
26 | #define INVALID_GRANT_REF (0) |
27 | #define INVALID_EVTCHN (-1) | |
28 | ||
29 | struct pci_bus_entry { | |
30 | struct list_head list; | |
31 | struct pci_bus *bus; | |
32 | }; | |
33 | ||
34 | #define _PDEVB_op_active (0) | |
35 | #define PDEVB_op_active (1 << (_PDEVB_op_active)) | |
36 | ||
37 | struct pcifront_device { | |
38 | struct xenbus_device *xdev; | |
39 | struct list_head root_buses; | |
40 | ||
41 | int evtchn; | |
42 | int gnt_ref; | |
43 | ||
44 | int irq; | |
45 | ||
46 | /* Lock this when doing any operations in sh_info */ | |
47 | spinlock_t sh_info_lock; | |
48 | struct xen_pci_sharedinfo *sh_info; | |
49 | struct work_struct op_work; | |
50 | unsigned long flags; | |
51 | ||
52 | }; | |
53 | ||
54 | struct pcifront_sd { | |
55 | int domain; | |
56 | struct pcifront_device *pdev; | |
57 | }; | |
58 | ||
59 | static inline struct pcifront_device * | |
60 | pcifront_get_pdev(struct pcifront_sd *sd) | |
61 | { | |
62 | return sd->pdev; | |
63 | } | |
64 | ||
65 | static inline void pcifront_init_sd(struct pcifront_sd *sd, | |
66 | unsigned int domain, unsigned int bus, | |
67 | struct pcifront_device *pdev) | |
68 | { | |
69 | sd->domain = domain; | |
70 | sd->pdev = pdev; | |
71 | } | |
72 | ||
73 | static DEFINE_SPINLOCK(pcifront_dev_lock); | |
74 | static struct pcifront_device *pcifront_dev; | |
75 | ||
76 | static int verbose_request; | |
77 | module_param(verbose_request, int, 0644); | |
78 | ||
79 | static int errno_to_pcibios_err(int errno) | |
80 | { | |
81 | switch (errno) { | |
82 | case XEN_PCI_ERR_success: | |
83 | return PCIBIOS_SUCCESSFUL; | |
84 | ||
85 | case XEN_PCI_ERR_dev_not_found: | |
86 | return PCIBIOS_DEVICE_NOT_FOUND; | |
87 | ||
88 | case XEN_PCI_ERR_invalid_offset: | |
89 | case XEN_PCI_ERR_op_failed: | |
90 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
91 | ||
92 | case XEN_PCI_ERR_not_implemented: | |
93 | return PCIBIOS_FUNC_NOT_SUPPORTED; | |
94 | ||
95 | case XEN_PCI_ERR_access_denied: | |
96 | return PCIBIOS_SET_FAILED; | |
97 | } | |
98 | return errno; | |
99 | } | |
100 | ||
101 | static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev) | |
102 | { | |
103 | if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags) | |
104 | && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) { | |
105 | dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n"); | |
106 | schedule_work(&pdev->op_work); | |
107 | } | |
108 | } | |
109 | ||
110 | static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) | |
111 | { | |
112 | int err = 0; | |
113 | struct xen_pci_op *active_op = &pdev->sh_info->op; | |
114 | unsigned long irq_flags; | |
115 | evtchn_port_t port = pdev->evtchn; | |
116 | unsigned irq = pdev->irq; | |
117 | s64 ns, ns_timeout; | |
118 | struct timeval tv; | |
119 | ||
120 | spin_lock_irqsave(&pdev->sh_info_lock, irq_flags); | |
121 | ||
122 | memcpy(active_op, op, sizeof(struct xen_pci_op)); | |
123 | ||
124 | /* Go */ | |
125 | wmb(); | |
126 | set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags); | |
127 | notify_remote_via_evtchn(port); | |
128 | ||
129 | /* | |
130 | * We set a poll timeout of 3 seconds but give up on return after | |
131 | * 2 seconds. It is better to time out too late rather than too early | |
132 | * (in the latter case we end up continually re-executing poll() with a | |
133 | * timeout in the past). 1s difference gives plenty of slack for error. | |
134 | */ | |
135 | do_gettimeofday(&tv); | |
136 | ns_timeout = timeval_to_ns(&tv) + 2 * (s64)NSEC_PER_SEC; | |
137 | ||
138 | xen_clear_irq_pending(irq); | |
139 | ||
140 | while (test_bit(_XEN_PCIF_active, | |
141 | (unsigned long *)&pdev->sh_info->flags)) { | |
142 | xen_poll_irq_timeout(irq, jiffies + 3*HZ); | |
143 | xen_clear_irq_pending(irq); | |
144 | do_gettimeofday(&tv); | |
145 | ns = timeval_to_ns(&tv); | |
146 | if (ns > ns_timeout) { | |
147 | dev_err(&pdev->xdev->dev, | |
148 | "pciback not responding!!!\n"); | |
149 | clear_bit(_XEN_PCIF_active, | |
150 | (unsigned long *)&pdev->sh_info->flags); | |
151 | err = XEN_PCI_ERR_dev_not_found; | |
152 | goto out; | |
153 | } | |
154 | } | |
155 | ||
156 | /* | |
157 | * We might lose backend service request since we | |
158 | * reuse same evtchn with pci_conf backend response. So re-schedule | |
159 | * aer pcifront service. | |
160 | */ | |
161 | if (test_bit(_XEN_PCIB_active, | |
162 | (unsigned long *)&pdev->sh_info->flags)) { | |
163 | dev_err(&pdev->xdev->dev, | |
164 | "schedule aer pcifront service\n"); | |
165 | schedule_pcifront_aer_op(pdev); | |
166 | } | |
167 | ||
168 | memcpy(op, active_op, sizeof(struct xen_pci_op)); | |
169 | ||
170 | err = op->err; | |
171 | out: | |
172 | spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags); | |
173 | return err; | |
174 | } | |
175 | ||
176 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
177 | static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn, | |
178 | int where, int size, u32 *val) | |
179 | { | |
180 | int err = 0; | |
181 | struct xen_pci_op op = { | |
182 | .cmd = XEN_PCI_OP_conf_read, | |
183 | .domain = pci_domain_nr(bus), | |
184 | .bus = bus->number, | |
185 | .devfn = devfn, | |
186 | .offset = where, | |
187 | .size = size, | |
188 | }; | |
189 | struct pcifront_sd *sd = bus->sysdata; | |
190 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
191 | ||
192 | if (verbose_request) | |
193 | dev_info(&pdev->xdev->dev, | |
e4de866a | 194 | "read dev=%04x:%02x:%02x.%d - offset %x size %d\n", |
956a9202 RW |
195 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), |
196 | PCI_FUNC(devfn), where, size); | |
197 | ||
198 | err = do_pci_op(pdev, &op); | |
199 | ||
200 | if (likely(!err)) { | |
201 | if (verbose_request) | |
202 | dev_info(&pdev->xdev->dev, "read got back value %x\n", | |
203 | op.value); | |
204 | ||
205 | *val = op.value; | |
206 | } else if (err == -ENODEV) { | |
207 | /* No device here, pretend that it just returned 0 */ | |
208 | err = 0; | |
209 | *val = 0; | |
210 | } | |
211 | ||
212 | return errno_to_pcibios_err(err); | |
213 | } | |
214 | ||
215 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
216 | static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn, | |
217 | int where, int size, u32 val) | |
218 | { | |
219 | struct xen_pci_op op = { | |
220 | .cmd = XEN_PCI_OP_conf_write, | |
221 | .domain = pci_domain_nr(bus), | |
222 | .bus = bus->number, | |
223 | .devfn = devfn, | |
224 | .offset = where, | |
225 | .size = size, | |
226 | .value = val, | |
227 | }; | |
228 | struct pcifront_sd *sd = bus->sysdata; | |
229 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
230 | ||
231 | if (verbose_request) | |
232 | dev_info(&pdev->xdev->dev, | |
e4de866a | 233 | "write dev=%04x:%02x:%02x.%d - " |
956a9202 RW |
234 | "offset %x size %d val %x\n", |
235 | pci_domain_nr(bus), bus->number, | |
236 | PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); | |
237 | ||
238 | return errno_to_pcibios_err(do_pci_op(pdev, &op)); | |
239 | } | |
240 | ||
b8b0f559 | 241 | static struct pci_ops pcifront_bus_ops = { |
956a9202 RW |
242 | .read = pcifront_bus_read, |
243 | .write = pcifront_bus_write, | |
244 | }; | |
245 | ||
246 | #ifdef CONFIG_PCI_MSI | |
247 | static int pci_frontend_enable_msix(struct pci_dev *dev, | |
cc0f89c4 | 248 | int vector[], int nvec) |
956a9202 RW |
249 | { |
250 | int err; | |
251 | int i; | |
252 | struct xen_pci_op op = { | |
253 | .cmd = XEN_PCI_OP_enable_msix, | |
254 | .domain = pci_domain_nr(dev->bus), | |
255 | .bus = dev->bus->number, | |
256 | .devfn = dev->devfn, | |
257 | .value = nvec, | |
258 | }; | |
259 | struct pcifront_sd *sd = dev->bus->sysdata; | |
260 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
261 | struct msi_desc *entry; | |
262 | ||
263 | if (nvec > SH_INFO_MAX_VEC) { | |
264 | dev_err(&dev->dev, "too much vector for pci frontend: %x." | |
265 | " Increase SH_INFO_MAX_VEC.\n", nvec); | |
266 | return -EINVAL; | |
267 | } | |
268 | ||
269 | i = 0; | |
270 | list_for_each_entry(entry, &dev->msi_list, list) { | |
271 | op.msix_entries[i].entry = entry->msi_attrib.entry_nr; | |
272 | /* Vector is useless at this point. */ | |
273 | op.msix_entries[i].vector = -1; | |
274 | i++; | |
275 | } | |
276 | ||
277 | err = do_pci_op(pdev, &op); | |
278 | ||
279 | if (likely(!err)) { | |
280 | if (likely(!op.value)) { | |
281 | /* we get the result */ | |
1d461052 KRW |
282 | for (i = 0; i < nvec; i++) { |
283 | if (op.msix_entries[i].vector <= 0) { | |
284 | dev_warn(&dev->dev, "MSI-X entry %d is invalid: %d!\n", | |
285 | i, op.msix_entries[i].vector); | |
286 | err = -EINVAL; | |
cc0f89c4 | 287 | vector[i] = -1; |
1d461052 KRW |
288 | continue; |
289 | } | |
cc0f89c4 | 290 | vector[i] = op.msix_entries[i].vector; |
1d461052 | 291 | } |
956a9202 RW |
292 | } else { |
293 | printk(KERN_DEBUG "enable msix get value %x\n", | |
294 | op.value); | |
f09d8432 | 295 | err = op.value; |
956a9202 RW |
296 | } |
297 | } else { | |
298 | dev_err(&dev->dev, "enable msix get err %x\n", err); | |
956a9202 | 299 | } |
1d461052 | 300 | return err; |
956a9202 RW |
301 | } |
302 | ||
303 | static void pci_frontend_disable_msix(struct pci_dev *dev) | |
304 | { | |
305 | int err; | |
306 | struct xen_pci_op op = { | |
307 | .cmd = XEN_PCI_OP_disable_msix, | |
308 | .domain = pci_domain_nr(dev->bus), | |
309 | .bus = dev->bus->number, | |
310 | .devfn = dev->devfn, | |
311 | }; | |
312 | struct pcifront_sd *sd = dev->bus->sysdata; | |
313 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
314 | ||
315 | err = do_pci_op(pdev, &op); | |
316 | ||
317 | /* What should do for error ? */ | |
318 | if (err) | |
319 | dev_err(&dev->dev, "pci_disable_msix get err %x\n", err); | |
320 | } | |
321 | ||
cc0f89c4 | 322 | static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[]) |
956a9202 RW |
323 | { |
324 | int err; | |
325 | struct xen_pci_op op = { | |
326 | .cmd = XEN_PCI_OP_enable_msi, | |
327 | .domain = pci_domain_nr(dev->bus), | |
328 | .bus = dev->bus->number, | |
329 | .devfn = dev->devfn, | |
330 | }; | |
331 | struct pcifront_sd *sd = dev->bus->sysdata; | |
332 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
333 | ||
334 | err = do_pci_op(pdev, &op); | |
335 | if (likely(!err)) { | |
cc0f89c4 | 336 | vector[0] = op.value; |
1d461052 KRW |
337 | if (op.value <= 0) { |
338 | dev_warn(&dev->dev, "MSI entry is invalid: %d!\n", | |
339 | op.value); | |
340 | err = -EINVAL; | |
cc0f89c4 | 341 | vector[0] = -1; |
1d461052 | 342 | } |
956a9202 RW |
343 | } else { |
344 | dev_err(&dev->dev, "pci frontend enable msi failed for dev " | |
345 | "%x:%x\n", op.bus, op.devfn); | |
346 | err = -EINVAL; | |
347 | } | |
348 | return err; | |
349 | } | |
350 | ||
351 | static void pci_frontend_disable_msi(struct pci_dev *dev) | |
352 | { | |
353 | int err; | |
354 | struct xen_pci_op op = { | |
355 | .cmd = XEN_PCI_OP_disable_msi, | |
356 | .domain = pci_domain_nr(dev->bus), | |
357 | .bus = dev->bus->number, | |
358 | .devfn = dev->devfn, | |
359 | }; | |
360 | struct pcifront_sd *sd = dev->bus->sysdata; | |
361 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
362 | ||
363 | err = do_pci_op(pdev, &op); | |
364 | if (err == XEN_PCI_ERR_dev_not_found) { | |
365 | /* XXX No response from backend, what shall we do? */ | |
366 | printk(KERN_DEBUG "get no response from backend for disable MSI\n"); | |
367 | return; | |
368 | } | |
369 | if (err) | |
370 | /* how can pciback notify us fail? */ | |
371 | printk(KERN_DEBUG "get fake response frombackend\n"); | |
372 | } | |
373 | ||
374 | static struct xen_pci_frontend_ops pci_frontend_ops = { | |
375 | .enable_msi = pci_frontend_enable_msi, | |
376 | .disable_msi = pci_frontend_disable_msi, | |
377 | .enable_msix = pci_frontend_enable_msix, | |
378 | .disable_msix = pci_frontend_disable_msix, | |
379 | }; | |
380 | ||
381 | static void pci_frontend_registrar(int enable) | |
382 | { | |
383 | if (enable) | |
384 | xen_pci_frontend = &pci_frontend_ops; | |
385 | else | |
386 | xen_pci_frontend = NULL; | |
387 | }; | |
388 | #else | |
389 | static inline void pci_frontend_registrar(int enable) { }; | |
390 | #endif /* CONFIG_PCI_MSI */ | |
391 | ||
392 | /* Claim resources for the PCI frontend as-is, backend won't allow changes */ | |
393 | static int pcifront_claim_resource(struct pci_dev *dev, void *data) | |
394 | { | |
395 | struct pcifront_device *pdev = data; | |
396 | int i; | |
397 | struct resource *r; | |
398 | ||
399 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
400 | r = &dev->resource[i]; | |
401 | ||
402 | if (!r->parent && r->start && r->flags) { | |
403 | dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n", | |
404 | pci_name(dev), i); | |
405 | if (pci_claim_resource(dev, i)) { | |
917e3e65 KRW |
406 | dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! " |
407 | "Device offline. Try using e820_host=1 in the guest config.\n", | |
956a9202 RW |
408 | pci_name(dev), i); |
409 | } | |
410 | } | |
411 | } | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
15856ad5 | 416 | static int pcifront_scan_bus(struct pcifront_device *pdev, |
956a9202 RW |
417 | unsigned int domain, unsigned int bus, |
418 | struct pci_bus *b) | |
419 | { | |
420 | struct pci_dev *d; | |
421 | unsigned int devfn; | |
422 | ||
423 | /* Scan the bus for functions and add. | |
424 | * We omit handling of PCI bridge attachment because pciback prevents | |
425 | * bridges from being exported. | |
426 | */ | |
427 | for (devfn = 0; devfn < 0x100; devfn++) { | |
428 | d = pci_get_slot(b, devfn); | |
429 | if (d) { | |
430 | /* Device is already known. */ | |
431 | pci_dev_put(d); | |
432 | continue; | |
433 | } | |
434 | ||
435 | d = pci_scan_single_device(b, devfn); | |
436 | if (d) | |
437 | dev_info(&pdev->xdev->dev, "New device on " | |
e4de866a | 438 | "%04x:%02x:%02x.%d found.\n", domain, bus, |
956a9202 RW |
439 | PCI_SLOT(devfn), PCI_FUNC(devfn)); |
440 | } | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
15856ad5 | 445 | static int pcifront_scan_root(struct pcifront_device *pdev, |
956a9202 RW |
446 | unsigned int domain, unsigned int bus) |
447 | { | |
448 | struct pci_bus *b; | |
449 | struct pcifront_sd *sd = NULL; | |
450 | struct pci_bus_entry *bus_entry = NULL; | |
451 | int err = 0; | |
452 | ||
453 | #ifndef CONFIG_PCI_DOMAINS | |
454 | if (domain != 0) { | |
455 | dev_err(&pdev->xdev->dev, | |
456 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
457 | dev_err(&pdev->xdev->dev, | |
458 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
459 | err = -EINVAL; | |
460 | goto err_out; | |
461 | } | |
462 | #endif | |
463 | ||
464 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", | |
465 | domain, bus); | |
466 | ||
467 | bus_entry = kmalloc(sizeof(*bus_entry), GFP_KERNEL); | |
468 | sd = kmalloc(sizeof(*sd), GFP_KERNEL); | |
469 | if (!bus_entry || !sd) { | |
470 | err = -ENOMEM; | |
471 | goto err_out; | |
472 | } | |
473 | pcifront_init_sd(sd, domain, bus, pdev); | |
474 | ||
a83919e0 RW |
475 | pci_lock_rescan_remove(); |
476 | ||
956a9202 RW |
477 | b = pci_scan_bus_parented(&pdev->xdev->dev, bus, |
478 | &pcifront_bus_ops, sd); | |
479 | if (!b) { | |
480 | dev_err(&pdev->xdev->dev, | |
481 | "Error creating PCI Frontend Bus!\n"); | |
482 | err = -ENOMEM; | |
a83919e0 | 483 | pci_unlock_rescan_remove(); |
956a9202 RW |
484 | goto err_out; |
485 | } | |
486 | ||
487 | bus_entry->bus = b; | |
488 | ||
489 | list_add(&bus_entry->list, &pdev->root_buses); | |
490 | ||
491 | /* pci_scan_bus_parented skips devices which do not have a have | |
492 | * devfn==0. The pcifront_scan_bus enumerates all devfn. */ | |
493 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
494 | ||
495 | /* Claim resources before going "live" with our devices */ | |
496 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
497 | ||
498 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
499 | pci_bus_add_devices(b); | |
500 | ||
a83919e0 | 501 | pci_unlock_rescan_remove(); |
956a9202 RW |
502 | return err; |
503 | ||
504 | err_out: | |
505 | kfree(bus_entry); | |
506 | kfree(sd); | |
507 | ||
508 | return err; | |
509 | } | |
510 | ||
15856ad5 | 511 | static int pcifront_rescan_root(struct pcifront_device *pdev, |
956a9202 RW |
512 | unsigned int domain, unsigned int bus) |
513 | { | |
514 | int err; | |
515 | struct pci_bus *b; | |
516 | ||
517 | #ifndef CONFIG_PCI_DOMAINS | |
518 | if (domain != 0) { | |
519 | dev_err(&pdev->xdev->dev, | |
520 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
521 | dev_err(&pdev->xdev->dev, | |
522 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
523 | return -EINVAL; | |
524 | } | |
525 | #endif | |
526 | ||
527 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", | |
528 | domain, bus); | |
529 | ||
530 | b = pci_find_bus(domain, bus); | |
531 | if (!b) | |
532 | /* If the bus is unknown, create it. */ | |
533 | return pcifront_scan_root(pdev, domain, bus); | |
534 | ||
535 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
536 | ||
537 | /* Claim resources before going "live" with our devices */ | |
538 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
539 | ||
540 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
541 | pci_bus_add_devices(b); | |
542 | ||
543 | return err; | |
544 | } | |
545 | ||
546 | static void free_root_bus_devs(struct pci_bus *bus) | |
547 | { | |
548 | struct pci_dev *dev; | |
549 | ||
550 | while (!list_empty(&bus->devices)) { | |
551 | dev = container_of(bus->devices.next, struct pci_dev, | |
552 | bus_list); | |
553 | dev_dbg(&dev->dev, "removing device\n"); | |
210647af | 554 | pci_stop_and_remove_bus_device(dev); |
956a9202 RW |
555 | } |
556 | } | |
557 | ||
558 | static void pcifront_free_roots(struct pcifront_device *pdev) | |
559 | { | |
560 | struct pci_bus_entry *bus_entry, *t; | |
561 | ||
562 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); | |
563 | ||
a83919e0 | 564 | pci_lock_rescan_remove(); |
956a9202 RW |
565 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { |
566 | list_del(&bus_entry->list); | |
567 | ||
568 | free_root_bus_devs(bus_entry->bus); | |
569 | ||
570 | kfree(bus_entry->bus->sysdata); | |
571 | ||
572 | device_unregister(bus_entry->bus->bridge); | |
573 | pci_remove_bus(bus_entry->bus); | |
574 | ||
575 | kfree(bus_entry); | |
576 | } | |
a83919e0 | 577 | pci_unlock_rescan_remove(); |
956a9202 RW |
578 | } |
579 | ||
580 | static pci_ers_result_t pcifront_common_process(int cmd, | |
581 | struct pcifront_device *pdev, | |
582 | pci_channel_state_t state) | |
583 | { | |
584 | pci_ers_result_t result; | |
585 | struct pci_driver *pdrv; | |
586 | int bus = pdev->sh_info->aer_op.bus; | |
587 | int devfn = pdev->sh_info->aer_op.devfn; | |
588 | struct pci_dev *pcidev; | |
589 | int flag = 0; | |
590 | ||
591 | dev_dbg(&pdev->xdev->dev, | |
592 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", | |
593 | cmd, bus, devfn); | |
594 | result = PCI_ERS_RESULT_NONE; | |
595 | ||
596 | pcidev = pci_get_bus_and_slot(bus, devfn); | |
597 | if (!pcidev || !pcidev->driver) { | |
2a63dd72 JS |
598 | dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); |
599 | if (pcidev) | |
600 | pci_dev_put(pcidev); | |
956a9202 RW |
601 | return result; |
602 | } | |
603 | pdrv = pcidev->driver; | |
604 | ||
07d25146 | 605 | if (pdrv) { |
956a9202 RW |
606 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { |
607 | dev_dbg(&pcidev->dev, | |
608 | "trying to call AER service\n"); | |
609 | if (pcidev) { | |
610 | flag = 1; | |
611 | switch (cmd) { | |
612 | case XEN_PCI_OP_aer_detected: | |
613 | result = pdrv->err_handler-> | |
614 | error_detected(pcidev, state); | |
615 | break; | |
616 | case XEN_PCI_OP_aer_mmio: | |
617 | result = pdrv->err_handler-> | |
618 | mmio_enabled(pcidev); | |
619 | break; | |
620 | case XEN_PCI_OP_aer_slotreset: | |
621 | result = pdrv->err_handler-> | |
622 | slot_reset(pcidev); | |
623 | break; | |
624 | case XEN_PCI_OP_aer_resume: | |
625 | pdrv->err_handler->resume(pcidev); | |
626 | break; | |
627 | default: | |
628 | dev_err(&pdev->xdev->dev, | |
629 | "bad request in aer recovery " | |
630 | "operation!\n"); | |
631 | ||
632 | } | |
633 | } | |
634 | } | |
956a9202 RW |
635 | } |
636 | if (!flag) | |
637 | result = PCI_ERS_RESULT_NONE; | |
638 | ||
639 | return result; | |
640 | } | |
641 | ||
642 | ||
643 | static void pcifront_do_aer(struct work_struct *data) | |
644 | { | |
645 | struct pcifront_device *pdev = | |
646 | container_of(data, struct pcifront_device, op_work); | |
647 | int cmd = pdev->sh_info->aer_op.cmd; | |
648 | pci_channel_state_t state = | |
649 | (pci_channel_state_t)pdev->sh_info->aer_op.err; | |
650 | ||
651 | /*If a pci_conf op is in progress, | |
652 | we have to wait until it is done before service aer op*/ | |
653 | dev_dbg(&pdev->xdev->dev, | |
654 | "pcifront service aer bus %x devfn %x\n", | |
655 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); | |
656 | ||
657 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); | |
658 | ||
659 | /* Post the operation to the guest. */ | |
660 | wmb(); | |
661 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); | |
662 | notify_remote_via_evtchn(pdev->evtchn); | |
663 | ||
664 | /*in case of we lost an aer request in four lines time_window*/ | |
4e857c58 | 665 | smp_mb__before_atomic(); |
956a9202 | 666 | clear_bit(_PDEVB_op_active, &pdev->flags); |
4e857c58 | 667 | smp_mb__after_atomic(); |
956a9202 RW |
668 | |
669 | schedule_pcifront_aer_op(pdev); | |
670 | ||
671 | } | |
672 | ||
673 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) | |
674 | { | |
675 | struct pcifront_device *pdev = dev; | |
676 | schedule_pcifront_aer_op(pdev); | |
677 | return IRQ_HANDLED; | |
678 | } | |
3d925320 | 679 | static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) |
956a9202 RW |
680 | { |
681 | int err = 0; | |
682 | ||
683 | spin_lock(&pcifront_dev_lock); | |
684 | ||
685 | if (!pcifront_dev) { | |
686 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); | |
687 | pcifront_dev = pdev; | |
098b1aea | 688 | } else |
956a9202 | 689 | err = -EEXIST; |
098b1aea | 690 | |
956a9202 RW |
691 | spin_unlock(&pcifront_dev_lock); |
692 | ||
3d925320 KRW |
693 | if (!err && !swiotlb_nr_tbl()) { |
694 | err = pci_xen_swiotlb_init_late(); | |
695 | if (err) | |
696 | dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); | |
697 | } | |
956a9202 RW |
698 | return err; |
699 | } | |
700 | ||
701 | static void pcifront_disconnect(struct pcifront_device *pdev) | |
702 | { | |
703 | spin_lock(&pcifront_dev_lock); | |
704 | ||
705 | if (pdev == pcifront_dev) { | |
706 | dev_info(&pdev->xdev->dev, | |
707 | "Disconnecting PCI Frontend Buses\n"); | |
708 | pcifront_dev = NULL; | |
709 | } | |
710 | ||
711 | spin_unlock(&pcifront_dev_lock); | |
712 | } | |
713 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) | |
714 | { | |
715 | struct pcifront_device *pdev; | |
716 | ||
717 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); | |
718 | if (pdev == NULL) | |
719 | goto out; | |
720 | ||
721 | pdev->sh_info = | |
722 | (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL); | |
723 | if (pdev->sh_info == NULL) { | |
724 | kfree(pdev); | |
725 | pdev = NULL; | |
726 | goto out; | |
727 | } | |
728 | pdev->sh_info->flags = 0; | |
729 | ||
730 | /*Flag for registering PV AER handler*/ | |
731 | set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags); | |
732 | ||
733 | dev_set_drvdata(&xdev->dev, pdev); | |
734 | pdev->xdev = xdev; | |
735 | ||
736 | INIT_LIST_HEAD(&pdev->root_buses); | |
737 | ||
738 | spin_lock_init(&pdev->sh_info_lock); | |
739 | ||
740 | pdev->evtchn = INVALID_EVTCHN; | |
741 | pdev->gnt_ref = INVALID_GRANT_REF; | |
742 | pdev->irq = -1; | |
743 | ||
744 | INIT_WORK(&pdev->op_work, pcifront_do_aer); | |
745 | ||
746 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", | |
747 | pdev, pdev->sh_info); | |
748 | out: | |
749 | return pdev; | |
750 | } | |
751 | ||
752 | static void free_pdev(struct pcifront_device *pdev) | |
753 | { | |
754 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); | |
755 | ||
756 | pcifront_free_roots(pdev); | |
757 | ||
db2e2e6e | 758 | cancel_work_sync(&pdev->op_work); |
956a9202 RW |
759 | |
760 | if (pdev->irq >= 0) | |
761 | unbind_from_irqhandler(pdev->irq, pdev); | |
762 | ||
763 | if (pdev->evtchn != INVALID_EVTCHN) | |
764 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); | |
765 | ||
766 | if (pdev->gnt_ref != INVALID_GRANT_REF) | |
767 | gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */, | |
768 | (unsigned long)pdev->sh_info); | |
769 | else | |
770 | free_page((unsigned long)pdev->sh_info); | |
771 | ||
772 | dev_set_drvdata(&pdev->xdev->dev, NULL); | |
773 | ||
774 | kfree(pdev); | |
775 | } | |
776 | ||
777 | static int pcifront_publish_info(struct pcifront_device *pdev) | |
778 | { | |
779 | int err = 0; | |
780 | struct xenbus_transaction trans; | |
781 | ||
782 | err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info)); | |
783 | if (err < 0) | |
784 | goto out; | |
785 | ||
786 | pdev->gnt_ref = err; | |
787 | ||
788 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); | |
789 | if (err) | |
790 | goto out; | |
791 | ||
792 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, | |
793 | 0, "pcifront", pdev); | |
794 | ||
795 | if (err < 0) | |
796 | return err; | |
797 | ||
798 | pdev->irq = err; | |
799 | ||
800 | do_publish: | |
801 | err = xenbus_transaction_start(&trans); | |
802 | if (err) { | |
803 | xenbus_dev_fatal(pdev->xdev, err, | |
804 | "Error writing configuration for backend " | |
805 | "(start transaction)"); | |
806 | goto out; | |
807 | } | |
808 | ||
809 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
810 | "pci-op-ref", "%u", pdev->gnt_ref); | |
811 | if (!err) | |
812 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
813 | "event-channel", "%u", pdev->evtchn); | |
814 | if (!err) | |
815 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
816 | "magic", XEN_PCI_MAGIC); | |
817 | ||
818 | if (err) { | |
819 | xenbus_transaction_end(trans, 1); | |
820 | xenbus_dev_fatal(pdev->xdev, err, | |
821 | "Error writing configuration for backend"); | |
822 | goto out; | |
823 | } else { | |
824 | err = xenbus_transaction_end(trans, 0); | |
825 | if (err == -EAGAIN) | |
826 | goto do_publish; | |
827 | else if (err) { | |
828 | xenbus_dev_fatal(pdev->xdev, err, | |
829 | "Error completing transaction " | |
830 | "for backend"); | |
831 | goto out; | |
832 | } | |
833 | } | |
834 | ||
835 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | |
836 | ||
837 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); | |
838 | ||
839 | out: | |
840 | return err; | |
841 | } | |
842 | ||
15856ad5 | 843 | static int pcifront_try_connect(struct pcifront_device *pdev) |
956a9202 RW |
844 | { |
845 | int err = -EFAULT; | |
846 | int i, num_roots, len; | |
847 | char str[64]; | |
848 | unsigned int domain, bus; | |
849 | ||
850 | ||
851 | /* Only connect once */ | |
852 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
853 | XenbusStateInitialised) | |
854 | goto out; | |
855 | ||
3d925320 | 856 | err = pcifront_connect_and_init_dma(pdev); |
098b1aea | 857 | if (err && err != -EEXIST) { |
956a9202 | 858 | xenbus_dev_fatal(pdev->xdev, err, |
3d925320 | 859 | "Error setting up PCI Frontend"); |
956a9202 RW |
860 | goto out; |
861 | } | |
862 | ||
863 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
864 | "root_num", "%d", &num_roots); | |
865 | if (err == -ENOENT) { | |
866 | xenbus_dev_error(pdev->xdev, err, | |
867 | "No PCI Roots found, trying 0000:00"); | |
868 | err = pcifront_scan_root(pdev, 0, 0); | |
869 | num_roots = 0; | |
870 | } else if (err != 1) { | |
871 | if (err == 0) | |
872 | err = -EINVAL; | |
873 | xenbus_dev_fatal(pdev->xdev, err, | |
874 | "Error reading number of PCI roots"); | |
875 | goto out; | |
876 | } | |
877 | ||
878 | for (i = 0; i < num_roots; i++) { | |
879 | len = snprintf(str, sizeof(str), "root-%d", i); | |
880 | if (unlikely(len >= (sizeof(str) - 1))) { | |
881 | err = -ENOMEM; | |
882 | goto out; | |
883 | } | |
884 | ||
885 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
886 | "%x:%x", &domain, &bus); | |
887 | if (err != 2) { | |
888 | if (err >= 0) | |
889 | err = -EINVAL; | |
890 | xenbus_dev_fatal(pdev->xdev, err, | |
891 | "Error reading PCI root %d", i); | |
892 | goto out; | |
893 | } | |
894 | ||
895 | err = pcifront_scan_root(pdev, domain, bus); | |
896 | if (err) { | |
897 | xenbus_dev_fatal(pdev->xdev, err, | |
898 | "Error scanning PCI root %04x:%02x", | |
899 | domain, bus); | |
900 | goto out; | |
901 | } | |
902 | } | |
903 | ||
904 | err = xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
905 | ||
906 | out: | |
907 | return err; | |
908 | } | |
909 | ||
910 | static int pcifront_try_disconnect(struct pcifront_device *pdev) | |
911 | { | |
912 | int err = 0; | |
913 | enum xenbus_state prev_state; | |
914 | ||
915 | ||
916 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); | |
917 | ||
918 | if (prev_state >= XenbusStateClosing) | |
919 | goto out; | |
920 | ||
921 | if (prev_state == XenbusStateConnected) { | |
922 | pcifront_free_roots(pdev); | |
923 | pcifront_disconnect(pdev); | |
924 | } | |
925 | ||
926 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); | |
927 | ||
928 | out: | |
929 | ||
930 | return err; | |
931 | } | |
932 | ||
15856ad5 | 933 | static int pcifront_attach_devices(struct pcifront_device *pdev) |
956a9202 RW |
934 | { |
935 | int err = -EFAULT; | |
936 | int i, num_roots, len; | |
937 | unsigned int domain, bus; | |
938 | char str[64]; | |
939 | ||
940 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
941 | XenbusStateReconfiguring) | |
942 | goto out; | |
943 | ||
944 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
945 | "root_num", "%d", &num_roots); | |
946 | if (err == -ENOENT) { | |
947 | xenbus_dev_error(pdev->xdev, err, | |
948 | "No PCI Roots found, trying 0000:00"); | |
949 | err = pcifront_rescan_root(pdev, 0, 0); | |
950 | num_roots = 0; | |
951 | } else if (err != 1) { | |
952 | if (err == 0) | |
953 | err = -EINVAL; | |
954 | xenbus_dev_fatal(pdev->xdev, err, | |
955 | "Error reading number of PCI roots"); | |
956 | goto out; | |
957 | } | |
958 | ||
959 | for (i = 0; i < num_roots; i++) { | |
960 | len = snprintf(str, sizeof(str), "root-%d", i); | |
961 | if (unlikely(len >= (sizeof(str) - 1))) { | |
962 | err = -ENOMEM; | |
963 | goto out; | |
964 | } | |
965 | ||
966 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
967 | "%x:%x", &domain, &bus); | |
968 | if (err != 2) { | |
969 | if (err >= 0) | |
970 | err = -EINVAL; | |
971 | xenbus_dev_fatal(pdev->xdev, err, | |
972 | "Error reading PCI root %d", i); | |
973 | goto out; | |
974 | } | |
975 | ||
976 | err = pcifront_rescan_root(pdev, domain, bus); | |
977 | if (err) { | |
978 | xenbus_dev_fatal(pdev->xdev, err, | |
979 | "Error scanning PCI root %04x:%02x", | |
980 | domain, bus); | |
981 | goto out; | |
982 | } | |
983 | } | |
984 | ||
985 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
986 | ||
987 | out: | |
988 | return err; | |
989 | } | |
990 | ||
991 | static int pcifront_detach_devices(struct pcifront_device *pdev) | |
992 | { | |
993 | int err = 0; | |
994 | int i, num_devs; | |
995 | unsigned int domain, bus, slot, func; | |
956a9202 RW |
996 | struct pci_dev *pci_dev; |
997 | char str[64]; | |
998 | ||
999 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
1000 | XenbusStateConnected) | |
1001 | goto out; | |
1002 | ||
1003 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", | |
1004 | &num_devs); | |
1005 | if (err != 1) { | |
1006 | if (err >= 0) | |
1007 | err = -EINVAL; | |
1008 | xenbus_dev_fatal(pdev->xdev, err, | |
1009 | "Error reading number of PCI devices"); | |
1010 | goto out; | |
1011 | } | |
1012 | ||
1013 | /* Find devices being detached and remove them. */ | |
1014 | for (i = 0; i < num_devs; i++) { | |
1015 | int l, state; | |
1016 | l = snprintf(str, sizeof(str), "state-%d", i); | |
1017 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1018 | err = -ENOMEM; | |
1019 | goto out; | |
1020 | } | |
1021 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d", | |
1022 | &state); | |
1023 | if (err != 1) | |
1024 | state = XenbusStateUnknown; | |
1025 | ||
1026 | if (state != XenbusStateClosing) | |
1027 | continue; | |
1028 | ||
1029 | /* Remove device. */ | |
1030 | l = snprintf(str, sizeof(str), "vdev-%d", i); | |
1031 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1032 | err = -ENOMEM; | |
1033 | goto out; | |
1034 | } | |
1035 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
1036 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | |
1037 | if (err != 4) { | |
1038 | if (err >= 0) | |
1039 | err = -EINVAL; | |
1040 | xenbus_dev_fatal(pdev->xdev, err, | |
1041 | "Error reading PCI device %d", i); | |
1042 | goto out; | |
1043 | } | |
1044 | ||
2ccc246d JL |
1045 | pci_dev = pci_get_domain_bus_and_slot(domain, bus, |
1046 | PCI_DEVFN(slot, func)); | |
956a9202 RW |
1047 | if (!pci_dev) { |
1048 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1049 | "Cannot get PCI device %04x:%02x:%02x.%d\n", |
956a9202 RW |
1050 | domain, bus, slot, func); |
1051 | continue; | |
1052 | } | |
a83919e0 | 1053 | pci_lock_rescan_remove(); |
210647af | 1054 | pci_stop_and_remove_bus_device(pci_dev); |
956a9202 | 1055 | pci_dev_put(pci_dev); |
a83919e0 | 1056 | pci_unlock_rescan_remove(); |
956a9202 RW |
1057 | |
1058 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1059 | "PCI device %04x:%02x:%02x.%d removed.\n", |
956a9202 RW |
1060 | domain, bus, slot, func); |
1061 | } | |
1062 | ||
1063 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); | |
1064 | ||
1065 | out: | |
1066 | return err; | |
1067 | } | |
1068 | ||
1069 | static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev, | |
1070 | enum xenbus_state be_state) | |
1071 | { | |
1072 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1073 | ||
1074 | switch (be_state) { | |
1075 | case XenbusStateUnknown: | |
1076 | case XenbusStateInitialising: | |
1077 | case XenbusStateInitWait: | |
1078 | case XenbusStateInitialised: | |
956a9202 RW |
1079 | break; |
1080 | ||
1081 | case XenbusStateConnected: | |
1082 | pcifront_try_connect(pdev); | |
1083 | break; | |
1084 | ||
d5af64de DV |
1085 | case XenbusStateClosed: |
1086 | if (xdev->state == XenbusStateClosed) | |
1087 | break; | |
1088 | /* Missed the backend's CLOSING state -- fallthrough */ | |
956a9202 RW |
1089 | case XenbusStateClosing: |
1090 | dev_warn(&xdev->dev, "backend going away!\n"); | |
1091 | pcifront_try_disconnect(pdev); | |
1092 | break; | |
1093 | ||
1094 | case XenbusStateReconfiguring: | |
1095 | pcifront_detach_devices(pdev); | |
1096 | break; | |
1097 | ||
1098 | case XenbusStateReconfigured: | |
1099 | pcifront_attach_devices(pdev); | |
1100 | break; | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, | |
1105 | const struct xenbus_device_id *id) | |
1106 | { | |
1107 | int err = 0; | |
1108 | struct pcifront_device *pdev = alloc_pdev(xdev); | |
1109 | ||
1110 | if (pdev == NULL) { | |
1111 | err = -ENOMEM; | |
1112 | xenbus_dev_fatal(xdev, err, | |
1113 | "Error allocating pcifront_device struct"); | |
1114 | goto out; | |
1115 | } | |
1116 | ||
1117 | err = pcifront_publish_info(pdev); | |
1118 | if (err) | |
1119 | free_pdev(pdev); | |
1120 | ||
1121 | out: | |
1122 | return err; | |
1123 | } | |
1124 | ||
1125 | static int pcifront_xenbus_remove(struct xenbus_device *xdev) | |
1126 | { | |
1127 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1128 | if (pdev) | |
1129 | free_pdev(pdev); | |
1130 | ||
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | static const struct xenbus_device_id xenpci_ids[] = { | |
1135 | {"pci"}, | |
1136 | {""}, | |
1137 | }; | |
1138 | ||
95afae48 DV |
1139 | static struct xenbus_driver xenpci_driver = { |
1140 | .name = "pcifront", | |
1141 | .ids = xenpci_ids, | |
956a9202 RW |
1142 | .probe = pcifront_xenbus_probe, |
1143 | .remove = pcifront_xenbus_remove, | |
1144 | .otherend_changed = pcifront_backend_changed, | |
95afae48 | 1145 | }; |
956a9202 RW |
1146 | |
1147 | static int __init pcifront_init(void) | |
1148 | { | |
1149 | if (!xen_pv_domain() || xen_initial_domain()) | |
1150 | return -ENODEV; | |
1151 | ||
51c71a3b KRW |
1152 | if (!xen_has_pv_devices()) |
1153 | return -ENODEV; | |
1154 | ||
956a9202 RW |
1155 | pci_frontend_registrar(1 /* enable */); |
1156 | ||
73db144b | 1157 | return xenbus_register_frontend(&xenpci_driver); |
956a9202 RW |
1158 | } |
1159 | ||
1160 | static void __exit pcifront_cleanup(void) | |
1161 | { | |
73db144b | 1162 | xenbus_unregister_driver(&xenpci_driver); |
956a9202 RW |
1163 | pci_frontend_registrar(0 /* disable */); |
1164 | } | |
1165 | module_init(pcifront_init); | |
1166 | module_exit(pcifront_cleanup); | |
1167 | ||
1168 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); | |
1169 | MODULE_LICENSE("GPL"); | |
1170 | MODULE_ALIAS("xen:pci"); |