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> | |
e1d5bbcd | 23 | #include <linux/ktime.h> |
51c71a3b | 24 | #include <xen/platform_pci.h> |
956a9202 | 25 | |
3d925320 | 26 | #include <asm/xen/swiotlb-xen.h> |
956a9202 RW |
27 | #define INVALID_GRANT_REF (0) |
28 | #define INVALID_EVTCHN (-1) | |
29 | ||
30 | struct pci_bus_entry { | |
31 | struct list_head list; | |
32 | struct pci_bus *bus; | |
33 | }; | |
34 | ||
35 | #define _PDEVB_op_active (0) | |
36 | #define PDEVB_op_active (1 << (_PDEVB_op_active)) | |
37 | ||
38 | struct pcifront_device { | |
39 | struct xenbus_device *xdev; | |
40 | struct list_head root_buses; | |
41 | ||
42 | int evtchn; | |
43 | int gnt_ref; | |
44 | ||
45 | int irq; | |
46 | ||
47 | /* Lock this when doing any operations in sh_info */ | |
48 | spinlock_t sh_info_lock; | |
49 | struct xen_pci_sharedinfo *sh_info; | |
50 | struct work_struct op_work; | |
51 | unsigned long flags; | |
52 | ||
53 | }; | |
54 | ||
55 | struct pcifront_sd { | |
56 | int domain; | |
57 | struct pcifront_device *pdev; | |
58 | }; | |
59 | ||
60 | static inline struct pcifront_device * | |
61 | pcifront_get_pdev(struct pcifront_sd *sd) | |
62 | { | |
63 | return sd->pdev; | |
64 | } | |
65 | ||
66 | static inline void pcifront_init_sd(struct pcifront_sd *sd, | |
67 | unsigned int domain, unsigned int bus, | |
68 | struct pcifront_device *pdev) | |
69 | { | |
70 | sd->domain = domain; | |
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; | |
956a9202 RW |
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 | */ | |
e1d5bbcd | 135 | ns_timeout = ktime_get_ns() + 2 * (s64)NSEC_PER_SEC; |
956a9202 RW |
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); | |
e1d5bbcd | 143 | ns = ktime_get_ns(); |
956a9202 RW |
144 | if (ns > ns_timeout) { |
145 | dev_err(&pdev->xdev->dev, | |
146 | "pciback not responding!!!\n"); | |
147 | clear_bit(_XEN_PCIF_active, | |
148 | (unsigned long *)&pdev->sh_info->flags); | |
149 | err = XEN_PCI_ERR_dev_not_found; | |
150 | goto out; | |
151 | } | |
152 | } | |
153 | ||
154 | /* | |
155 | * We might lose backend service request since we | |
156 | * reuse same evtchn with pci_conf backend response. So re-schedule | |
157 | * aer pcifront service. | |
158 | */ | |
159 | if (test_bit(_XEN_PCIB_active, | |
160 | (unsigned long *)&pdev->sh_info->flags)) { | |
161 | dev_err(&pdev->xdev->dev, | |
162 | "schedule aer pcifront service\n"); | |
163 | schedule_pcifront_aer_op(pdev); | |
164 | } | |
165 | ||
166 | memcpy(op, active_op, sizeof(struct xen_pci_op)); | |
167 | ||
168 | err = op->err; | |
169 | out: | |
170 | spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags); | |
171 | return err; | |
172 | } | |
173 | ||
174 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
175 | static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn, | |
176 | int where, int size, u32 *val) | |
177 | { | |
178 | int err = 0; | |
179 | struct xen_pci_op op = { | |
180 | .cmd = XEN_PCI_OP_conf_read, | |
181 | .domain = pci_domain_nr(bus), | |
182 | .bus = bus->number, | |
183 | .devfn = devfn, | |
184 | .offset = where, | |
185 | .size = size, | |
186 | }; | |
187 | struct pcifront_sd *sd = bus->sysdata; | |
188 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
189 | ||
190 | if (verbose_request) | |
191 | dev_info(&pdev->xdev->dev, | |
e4de866a | 192 | "read dev=%04x:%02x:%02x.%d - offset %x size %d\n", |
956a9202 RW |
193 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), |
194 | PCI_FUNC(devfn), where, size); | |
195 | ||
196 | err = do_pci_op(pdev, &op); | |
197 | ||
198 | if (likely(!err)) { | |
199 | if (verbose_request) | |
200 | dev_info(&pdev->xdev->dev, "read got back value %x\n", | |
201 | op.value); | |
202 | ||
203 | *val = op.value; | |
204 | } else if (err == -ENODEV) { | |
205 | /* No device here, pretend that it just returned 0 */ | |
206 | err = 0; | |
207 | *val = 0; | |
208 | } | |
209 | ||
210 | return errno_to_pcibios_err(err); | |
211 | } | |
212 | ||
213 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
214 | static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn, | |
215 | int where, int size, u32 val) | |
216 | { | |
217 | struct xen_pci_op op = { | |
218 | .cmd = XEN_PCI_OP_conf_write, | |
219 | .domain = pci_domain_nr(bus), | |
220 | .bus = bus->number, | |
221 | .devfn = devfn, | |
222 | .offset = where, | |
223 | .size = size, | |
224 | .value = val, | |
225 | }; | |
226 | struct pcifront_sd *sd = bus->sysdata; | |
227 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
228 | ||
229 | if (verbose_request) | |
230 | dev_info(&pdev->xdev->dev, | |
e4de866a | 231 | "write dev=%04x:%02x:%02x.%d - " |
956a9202 RW |
232 | "offset %x size %d val %x\n", |
233 | pci_domain_nr(bus), bus->number, | |
234 | PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); | |
235 | ||
236 | return errno_to_pcibios_err(do_pci_op(pdev, &op)); | |
237 | } | |
238 | ||
b8b0f559 | 239 | static struct pci_ops pcifront_bus_ops = { |
956a9202 RW |
240 | .read = pcifront_bus_read, |
241 | .write = pcifront_bus_write, | |
242 | }; | |
243 | ||
244 | #ifdef CONFIG_PCI_MSI | |
245 | static int pci_frontend_enable_msix(struct pci_dev *dev, | |
cc0f89c4 | 246 | int vector[], int nvec) |
956a9202 RW |
247 | { |
248 | int err; | |
249 | int i; | |
250 | struct xen_pci_op op = { | |
251 | .cmd = XEN_PCI_OP_enable_msix, | |
252 | .domain = pci_domain_nr(dev->bus), | |
253 | .bus = dev->bus->number, | |
254 | .devfn = dev->devfn, | |
255 | .value = nvec, | |
256 | }; | |
257 | struct pcifront_sd *sd = dev->bus->sysdata; | |
258 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
259 | struct msi_desc *entry; | |
260 | ||
261 | if (nvec > SH_INFO_MAX_VEC) { | |
262 | dev_err(&dev->dev, "too much vector for pci frontend: %x." | |
263 | " Increase SH_INFO_MAX_VEC.\n", nvec); | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
267 | i = 0; | |
5004e98a | 268 | for_each_pci_msi_entry(entry, dev) { |
956a9202 RW |
269 | op.msix_entries[i].entry = entry->msi_attrib.entry_nr; |
270 | /* Vector is useless at this point. */ | |
271 | op.msix_entries[i].vector = -1; | |
272 | i++; | |
273 | } | |
274 | ||
275 | err = do_pci_op(pdev, &op); | |
276 | ||
277 | if (likely(!err)) { | |
278 | if (likely(!op.value)) { | |
279 | /* we get the result */ | |
1d461052 KRW |
280 | for (i = 0; i < nvec; i++) { |
281 | if (op.msix_entries[i].vector <= 0) { | |
282 | dev_warn(&dev->dev, "MSI-X entry %d is invalid: %d!\n", | |
283 | i, op.msix_entries[i].vector); | |
284 | err = -EINVAL; | |
cc0f89c4 | 285 | vector[i] = -1; |
1d461052 KRW |
286 | continue; |
287 | } | |
cc0f89c4 | 288 | vector[i] = op.msix_entries[i].vector; |
1d461052 | 289 | } |
956a9202 RW |
290 | } else { |
291 | printk(KERN_DEBUG "enable msix get value %x\n", | |
292 | op.value); | |
f09d8432 | 293 | err = op.value; |
956a9202 RW |
294 | } |
295 | } else { | |
296 | dev_err(&dev->dev, "enable msix get err %x\n", err); | |
956a9202 | 297 | } |
1d461052 | 298 | return err; |
956a9202 RW |
299 | } |
300 | ||
301 | static void pci_frontend_disable_msix(struct pci_dev *dev) | |
302 | { | |
303 | int err; | |
304 | struct xen_pci_op op = { | |
305 | .cmd = XEN_PCI_OP_disable_msix, | |
306 | .domain = pci_domain_nr(dev->bus), | |
307 | .bus = dev->bus->number, | |
308 | .devfn = dev->devfn, | |
309 | }; | |
310 | struct pcifront_sd *sd = dev->bus->sysdata; | |
311 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
312 | ||
313 | err = do_pci_op(pdev, &op); | |
314 | ||
315 | /* What should do for error ? */ | |
316 | if (err) | |
317 | dev_err(&dev->dev, "pci_disable_msix get err %x\n", err); | |
318 | } | |
319 | ||
cc0f89c4 | 320 | static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[]) |
956a9202 RW |
321 | { |
322 | int err; | |
323 | struct xen_pci_op op = { | |
324 | .cmd = XEN_PCI_OP_enable_msi, | |
325 | .domain = pci_domain_nr(dev->bus), | |
326 | .bus = dev->bus->number, | |
327 | .devfn = dev->devfn, | |
328 | }; | |
329 | struct pcifront_sd *sd = dev->bus->sysdata; | |
330 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
331 | ||
332 | err = do_pci_op(pdev, &op); | |
333 | if (likely(!err)) { | |
cc0f89c4 | 334 | vector[0] = op.value; |
1d461052 KRW |
335 | if (op.value <= 0) { |
336 | dev_warn(&dev->dev, "MSI entry is invalid: %d!\n", | |
337 | op.value); | |
338 | err = -EINVAL; | |
cc0f89c4 | 339 | vector[0] = -1; |
1d461052 | 340 | } |
956a9202 RW |
341 | } else { |
342 | dev_err(&dev->dev, "pci frontend enable msi failed for dev " | |
343 | "%x:%x\n", op.bus, op.devfn); | |
344 | err = -EINVAL; | |
345 | } | |
346 | return err; | |
347 | } | |
348 | ||
349 | static void pci_frontend_disable_msi(struct pci_dev *dev) | |
350 | { | |
351 | int err; | |
352 | struct xen_pci_op op = { | |
353 | .cmd = XEN_PCI_OP_disable_msi, | |
354 | .domain = pci_domain_nr(dev->bus), | |
355 | .bus = dev->bus->number, | |
356 | .devfn = dev->devfn, | |
357 | }; | |
358 | struct pcifront_sd *sd = dev->bus->sysdata; | |
359 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
360 | ||
361 | err = do_pci_op(pdev, &op); | |
362 | if (err == XEN_PCI_ERR_dev_not_found) { | |
363 | /* XXX No response from backend, what shall we do? */ | |
364 | printk(KERN_DEBUG "get no response from backend for disable MSI\n"); | |
365 | return; | |
366 | } | |
367 | if (err) | |
368 | /* how can pciback notify us fail? */ | |
369 | printk(KERN_DEBUG "get fake response frombackend\n"); | |
370 | } | |
371 | ||
372 | static struct xen_pci_frontend_ops pci_frontend_ops = { | |
373 | .enable_msi = pci_frontend_enable_msi, | |
374 | .disable_msi = pci_frontend_disable_msi, | |
375 | .enable_msix = pci_frontend_enable_msix, | |
376 | .disable_msix = pci_frontend_disable_msix, | |
377 | }; | |
378 | ||
379 | static void pci_frontend_registrar(int enable) | |
380 | { | |
381 | if (enable) | |
382 | xen_pci_frontend = &pci_frontend_ops; | |
383 | else | |
384 | xen_pci_frontend = NULL; | |
385 | }; | |
386 | #else | |
387 | static inline void pci_frontend_registrar(int enable) { }; | |
388 | #endif /* CONFIG_PCI_MSI */ | |
389 | ||
390 | /* Claim resources for the PCI frontend as-is, backend won't allow changes */ | |
391 | static int pcifront_claim_resource(struct pci_dev *dev, void *data) | |
392 | { | |
393 | struct pcifront_device *pdev = data; | |
394 | int i; | |
395 | struct resource *r; | |
396 | ||
397 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
398 | r = &dev->resource[i]; | |
399 | ||
400 | if (!r->parent && r->start && r->flags) { | |
401 | dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n", | |
402 | pci_name(dev), i); | |
403 | if (pci_claim_resource(dev, i)) { | |
917e3e65 KRW |
404 | dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! " |
405 | "Device offline. Try using e820_host=1 in the guest config.\n", | |
956a9202 RW |
406 | pci_name(dev), i); |
407 | } | |
408 | } | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
15856ad5 | 414 | static int pcifront_scan_bus(struct pcifront_device *pdev, |
956a9202 RW |
415 | unsigned int domain, unsigned int bus, |
416 | struct pci_bus *b) | |
417 | { | |
418 | struct pci_dev *d; | |
419 | unsigned int devfn; | |
420 | ||
421 | /* Scan the bus for functions and add. | |
422 | * We omit handling of PCI bridge attachment because pciback prevents | |
423 | * bridges from being exported. | |
424 | */ | |
425 | for (devfn = 0; devfn < 0x100; devfn++) { | |
426 | d = pci_get_slot(b, devfn); | |
427 | if (d) { | |
428 | /* Device is already known. */ | |
429 | pci_dev_put(d); | |
430 | continue; | |
431 | } | |
432 | ||
433 | d = pci_scan_single_device(b, devfn); | |
434 | if (d) | |
435 | dev_info(&pdev->xdev->dev, "New device on " | |
e4de866a | 436 | "%04x:%02x:%02x.%d found.\n", domain, bus, |
956a9202 RW |
437 | PCI_SLOT(devfn), PCI_FUNC(devfn)); |
438 | } | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
15856ad5 | 443 | static int pcifront_scan_root(struct pcifront_device *pdev, |
956a9202 RW |
444 | unsigned int domain, unsigned int bus) |
445 | { | |
446 | struct pci_bus *b; | |
515d425b | 447 | LIST_HEAD(resources); |
956a9202 RW |
448 | struct pcifront_sd *sd = NULL; |
449 | struct pci_bus_entry *bus_entry = NULL; | |
450 | int err = 0; | |
515d425b AB |
451 | static struct resource busn_res = { |
452 | .start = 0, | |
453 | .end = 255, | |
454 | .flags = IORESOURCE_BUS, | |
455 | }; | |
956a9202 RW |
456 | |
457 | #ifndef CONFIG_PCI_DOMAINS | |
458 | if (domain != 0) { | |
459 | dev_err(&pdev->xdev->dev, | |
460 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
461 | dev_err(&pdev->xdev->dev, | |
462 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
463 | err = -EINVAL; | |
464 | goto err_out; | |
465 | } | |
466 | #endif | |
467 | ||
468 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", | |
469 | domain, bus); | |
470 | ||
471 | bus_entry = kmalloc(sizeof(*bus_entry), GFP_KERNEL); | |
472 | sd = kmalloc(sizeof(*sd), GFP_KERNEL); | |
473 | if (!bus_entry || !sd) { | |
474 | err = -ENOMEM; | |
475 | goto err_out; | |
476 | } | |
515d425b AB |
477 | pci_add_resource(&resources, &ioport_resource); |
478 | pci_add_resource(&resources, &iomem_resource); | |
479 | pci_add_resource(&resources, &busn_res); | |
956a9202 RW |
480 | pcifront_init_sd(sd, domain, bus, pdev); |
481 | ||
a83919e0 RW |
482 | pci_lock_rescan_remove(); |
483 | ||
515d425b AB |
484 | b = pci_scan_root_bus(&pdev->xdev->dev, bus, |
485 | &pcifront_bus_ops, sd, &resources); | |
956a9202 RW |
486 | if (!b) { |
487 | dev_err(&pdev->xdev->dev, | |
488 | "Error creating PCI Frontend Bus!\n"); | |
489 | err = -ENOMEM; | |
a83919e0 | 490 | pci_unlock_rescan_remove(); |
515d425b | 491 | pci_free_resource_list(&resources); |
956a9202 RW |
492 | goto err_out; |
493 | } | |
494 | ||
495 | bus_entry->bus = b; | |
496 | ||
497 | list_add(&bus_entry->list, &pdev->root_buses); | |
498 | ||
515d425b | 499 | /* pci_scan_root_bus skips devices which do not have a |
956a9202 RW |
500 | * devfn==0. The pcifront_scan_bus enumerates all devfn. */ |
501 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
502 | ||
503 | /* Claim resources before going "live" with our devices */ | |
504 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
505 | ||
506 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
507 | pci_bus_add_devices(b); | |
508 | ||
a83919e0 | 509 | pci_unlock_rescan_remove(); |
956a9202 RW |
510 | return err; |
511 | ||
512 | err_out: | |
513 | kfree(bus_entry); | |
514 | kfree(sd); | |
515 | ||
516 | return err; | |
517 | } | |
518 | ||
15856ad5 | 519 | static int pcifront_rescan_root(struct pcifront_device *pdev, |
956a9202 RW |
520 | unsigned int domain, unsigned int bus) |
521 | { | |
522 | int err; | |
523 | struct pci_bus *b; | |
524 | ||
525 | #ifndef CONFIG_PCI_DOMAINS | |
526 | if (domain != 0) { | |
527 | dev_err(&pdev->xdev->dev, | |
528 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
529 | dev_err(&pdev->xdev->dev, | |
530 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
531 | return -EINVAL; | |
532 | } | |
533 | #endif | |
534 | ||
535 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", | |
536 | domain, bus); | |
537 | ||
538 | b = pci_find_bus(domain, bus); | |
539 | if (!b) | |
540 | /* If the bus is unknown, create it. */ | |
541 | return pcifront_scan_root(pdev, domain, bus); | |
542 | ||
543 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
544 | ||
545 | /* Claim resources before going "live" with our devices */ | |
546 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
547 | ||
548 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
549 | pci_bus_add_devices(b); | |
550 | ||
551 | return err; | |
552 | } | |
553 | ||
554 | static void free_root_bus_devs(struct pci_bus *bus) | |
555 | { | |
556 | struct pci_dev *dev; | |
557 | ||
558 | while (!list_empty(&bus->devices)) { | |
559 | dev = container_of(bus->devices.next, struct pci_dev, | |
560 | bus_list); | |
561 | dev_dbg(&dev->dev, "removing device\n"); | |
210647af | 562 | pci_stop_and_remove_bus_device(dev); |
956a9202 RW |
563 | } |
564 | } | |
565 | ||
566 | static void pcifront_free_roots(struct pcifront_device *pdev) | |
567 | { | |
568 | struct pci_bus_entry *bus_entry, *t; | |
569 | ||
570 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); | |
571 | ||
a83919e0 | 572 | pci_lock_rescan_remove(); |
956a9202 RW |
573 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { |
574 | list_del(&bus_entry->list); | |
575 | ||
576 | free_root_bus_devs(bus_entry->bus); | |
577 | ||
578 | kfree(bus_entry->bus->sysdata); | |
579 | ||
580 | device_unregister(bus_entry->bus->bridge); | |
581 | pci_remove_bus(bus_entry->bus); | |
582 | ||
583 | kfree(bus_entry); | |
584 | } | |
a83919e0 | 585 | pci_unlock_rescan_remove(); |
956a9202 RW |
586 | } |
587 | ||
588 | static pci_ers_result_t pcifront_common_process(int cmd, | |
589 | struct pcifront_device *pdev, | |
590 | pci_channel_state_t state) | |
591 | { | |
592 | pci_ers_result_t result; | |
593 | struct pci_driver *pdrv; | |
594 | int bus = pdev->sh_info->aer_op.bus; | |
595 | int devfn = pdev->sh_info->aer_op.devfn; | |
596 | struct pci_dev *pcidev; | |
597 | int flag = 0; | |
598 | ||
599 | dev_dbg(&pdev->xdev->dev, | |
600 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", | |
601 | cmd, bus, devfn); | |
602 | result = PCI_ERS_RESULT_NONE; | |
603 | ||
604 | pcidev = pci_get_bus_and_slot(bus, devfn); | |
605 | if (!pcidev || !pcidev->driver) { | |
2a63dd72 | 606 | dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); |
ff0387c3 | 607 | pci_dev_put(pcidev); |
956a9202 RW |
608 | return result; |
609 | } | |
610 | pdrv = pcidev->driver; | |
611 | ||
07d25146 | 612 | if (pdrv) { |
956a9202 RW |
613 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { |
614 | dev_dbg(&pcidev->dev, | |
615 | "trying to call AER service\n"); | |
616 | if (pcidev) { | |
617 | flag = 1; | |
618 | switch (cmd) { | |
619 | case XEN_PCI_OP_aer_detected: | |
620 | result = pdrv->err_handler-> | |
621 | error_detected(pcidev, state); | |
622 | break; | |
623 | case XEN_PCI_OP_aer_mmio: | |
624 | result = pdrv->err_handler-> | |
625 | mmio_enabled(pcidev); | |
626 | break; | |
627 | case XEN_PCI_OP_aer_slotreset: | |
628 | result = pdrv->err_handler-> | |
629 | slot_reset(pcidev); | |
630 | break; | |
631 | case XEN_PCI_OP_aer_resume: | |
632 | pdrv->err_handler->resume(pcidev); | |
633 | break; | |
634 | default: | |
635 | dev_err(&pdev->xdev->dev, | |
636 | "bad request in aer recovery " | |
637 | "operation!\n"); | |
638 | ||
639 | } | |
640 | } | |
641 | } | |
956a9202 RW |
642 | } |
643 | if (!flag) | |
644 | result = PCI_ERS_RESULT_NONE; | |
645 | ||
646 | return result; | |
647 | } | |
648 | ||
649 | ||
650 | static void pcifront_do_aer(struct work_struct *data) | |
651 | { | |
652 | struct pcifront_device *pdev = | |
653 | container_of(data, struct pcifront_device, op_work); | |
654 | int cmd = pdev->sh_info->aer_op.cmd; | |
655 | pci_channel_state_t state = | |
656 | (pci_channel_state_t)pdev->sh_info->aer_op.err; | |
657 | ||
658 | /*If a pci_conf op is in progress, | |
659 | we have to wait until it is done before service aer op*/ | |
660 | dev_dbg(&pdev->xdev->dev, | |
661 | "pcifront service aer bus %x devfn %x\n", | |
662 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); | |
663 | ||
664 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); | |
665 | ||
666 | /* Post the operation to the guest. */ | |
667 | wmb(); | |
668 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); | |
669 | notify_remote_via_evtchn(pdev->evtchn); | |
670 | ||
671 | /*in case of we lost an aer request in four lines time_window*/ | |
4e857c58 | 672 | smp_mb__before_atomic(); |
956a9202 | 673 | clear_bit(_PDEVB_op_active, &pdev->flags); |
4e857c58 | 674 | smp_mb__after_atomic(); |
956a9202 RW |
675 | |
676 | schedule_pcifront_aer_op(pdev); | |
677 | ||
678 | } | |
679 | ||
680 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) | |
681 | { | |
682 | struct pcifront_device *pdev = dev; | |
683 | schedule_pcifront_aer_op(pdev); | |
684 | return IRQ_HANDLED; | |
685 | } | |
3d925320 | 686 | static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) |
956a9202 RW |
687 | { |
688 | int err = 0; | |
689 | ||
690 | spin_lock(&pcifront_dev_lock); | |
691 | ||
692 | if (!pcifront_dev) { | |
693 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); | |
694 | pcifront_dev = pdev; | |
098b1aea | 695 | } else |
956a9202 | 696 | err = -EEXIST; |
098b1aea | 697 | |
956a9202 RW |
698 | spin_unlock(&pcifront_dev_lock); |
699 | ||
3d925320 KRW |
700 | if (!err && !swiotlb_nr_tbl()) { |
701 | err = pci_xen_swiotlb_init_late(); | |
702 | if (err) | |
703 | dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); | |
704 | } | |
956a9202 RW |
705 | return err; |
706 | } | |
707 | ||
708 | static void pcifront_disconnect(struct pcifront_device *pdev) | |
709 | { | |
710 | spin_lock(&pcifront_dev_lock); | |
711 | ||
712 | if (pdev == pcifront_dev) { | |
713 | dev_info(&pdev->xdev->dev, | |
714 | "Disconnecting PCI Frontend Buses\n"); | |
715 | pcifront_dev = NULL; | |
716 | } | |
717 | ||
718 | spin_unlock(&pcifront_dev_lock); | |
719 | } | |
720 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) | |
721 | { | |
722 | struct pcifront_device *pdev; | |
723 | ||
724 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); | |
725 | if (pdev == NULL) | |
726 | goto out; | |
727 | ||
728 | pdev->sh_info = | |
729 | (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL); | |
730 | if (pdev->sh_info == NULL) { | |
731 | kfree(pdev); | |
732 | pdev = NULL; | |
733 | goto out; | |
734 | } | |
735 | pdev->sh_info->flags = 0; | |
736 | ||
737 | /*Flag for registering PV AER handler*/ | |
738 | set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags); | |
739 | ||
740 | dev_set_drvdata(&xdev->dev, pdev); | |
741 | pdev->xdev = xdev; | |
742 | ||
743 | INIT_LIST_HEAD(&pdev->root_buses); | |
744 | ||
745 | spin_lock_init(&pdev->sh_info_lock); | |
746 | ||
747 | pdev->evtchn = INVALID_EVTCHN; | |
748 | pdev->gnt_ref = INVALID_GRANT_REF; | |
749 | pdev->irq = -1; | |
750 | ||
751 | INIT_WORK(&pdev->op_work, pcifront_do_aer); | |
752 | ||
753 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", | |
754 | pdev, pdev->sh_info); | |
755 | out: | |
756 | return pdev; | |
757 | } | |
758 | ||
759 | static void free_pdev(struct pcifront_device *pdev) | |
760 | { | |
761 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); | |
762 | ||
763 | pcifront_free_roots(pdev); | |
764 | ||
db2e2e6e | 765 | cancel_work_sync(&pdev->op_work); |
956a9202 RW |
766 | |
767 | if (pdev->irq >= 0) | |
768 | unbind_from_irqhandler(pdev->irq, pdev); | |
769 | ||
770 | if (pdev->evtchn != INVALID_EVTCHN) | |
771 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); | |
772 | ||
773 | if (pdev->gnt_ref != INVALID_GRANT_REF) | |
774 | gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */, | |
775 | (unsigned long)pdev->sh_info); | |
776 | else | |
777 | free_page((unsigned long)pdev->sh_info); | |
778 | ||
779 | dev_set_drvdata(&pdev->xdev->dev, NULL); | |
780 | ||
781 | kfree(pdev); | |
782 | } | |
783 | ||
784 | static int pcifront_publish_info(struct pcifront_device *pdev) | |
785 | { | |
786 | int err = 0; | |
787 | struct xenbus_transaction trans; | |
ccc9d90a | 788 | grant_ref_t gref; |
956a9202 | 789 | |
ccc9d90a | 790 | err = xenbus_grant_ring(pdev->xdev, pdev->sh_info, 1, &gref); |
956a9202 RW |
791 | if (err < 0) |
792 | goto out; | |
793 | ||
ccc9d90a | 794 | pdev->gnt_ref = gref; |
956a9202 RW |
795 | |
796 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); | |
797 | if (err) | |
798 | goto out; | |
799 | ||
800 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, | |
801 | 0, "pcifront", pdev); | |
802 | ||
803 | if (err < 0) | |
804 | return err; | |
805 | ||
806 | pdev->irq = err; | |
807 | ||
808 | do_publish: | |
809 | err = xenbus_transaction_start(&trans); | |
810 | if (err) { | |
811 | xenbus_dev_fatal(pdev->xdev, err, | |
812 | "Error writing configuration for backend " | |
813 | "(start transaction)"); | |
814 | goto out; | |
815 | } | |
816 | ||
817 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
818 | "pci-op-ref", "%u", pdev->gnt_ref); | |
819 | if (!err) | |
820 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
821 | "event-channel", "%u", pdev->evtchn); | |
822 | if (!err) | |
823 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
824 | "magic", XEN_PCI_MAGIC); | |
825 | ||
826 | if (err) { | |
827 | xenbus_transaction_end(trans, 1); | |
828 | xenbus_dev_fatal(pdev->xdev, err, | |
829 | "Error writing configuration for backend"); | |
830 | goto out; | |
831 | } else { | |
832 | err = xenbus_transaction_end(trans, 0); | |
833 | if (err == -EAGAIN) | |
834 | goto do_publish; | |
835 | else if (err) { | |
836 | xenbus_dev_fatal(pdev->xdev, err, | |
837 | "Error completing transaction " | |
838 | "for backend"); | |
839 | goto out; | |
840 | } | |
841 | } | |
842 | ||
843 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | |
844 | ||
845 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); | |
846 | ||
847 | out: | |
848 | return err; | |
849 | } | |
850 | ||
15856ad5 | 851 | static int pcifront_try_connect(struct pcifront_device *pdev) |
956a9202 RW |
852 | { |
853 | int err = -EFAULT; | |
854 | int i, num_roots, len; | |
855 | char str[64]; | |
856 | unsigned int domain, bus; | |
857 | ||
858 | ||
859 | /* Only connect once */ | |
860 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
861 | XenbusStateInitialised) | |
862 | goto out; | |
863 | ||
3d925320 | 864 | err = pcifront_connect_and_init_dma(pdev); |
098b1aea | 865 | if (err && err != -EEXIST) { |
956a9202 | 866 | xenbus_dev_fatal(pdev->xdev, err, |
3d925320 | 867 | "Error setting up PCI Frontend"); |
956a9202 RW |
868 | goto out; |
869 | } | |
870 | ||
871 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
872 | "root_num", "%d", &num_roots); | |
873 | if (err == -ENOENT) { | |
874 | xenbus_dev_error(pdev->xdev, err, | |
875 | "No PCI Roots found, trying 0000:00"); | |
876 | err = pcifront_scan_root(pdev, 0, 0); | |
23cf1d00 CG |
877 | if (err) { |
878 | xenbus_dev_fatal(pdev->xdev, err, | |
879 | "Error scanning PCI root 0000:00"); | |
880 | goto out; | |
881 | } | |
956a9202 RW |
882 | num_roots = 0; |
883 | } else if (err != 1) { | |
884 | if (err == 0) | |
885 | err = -EINVAL; | |
886 | xenbus_dev_fatal(pdev->xdev, err, | |
887 | "Error reading number of PCI roots"); | |
888 | goto out; | |
889 | } | |
890 | ||
891 | for (i = 0; i < num_roots; i++) { | |
892 | len = snprintf(str, sizeof(str), "root-%d", i); | |
893 | if (unlikely(len >= (sizeof(str) - 1))) { | |
894 | err = -ENOMEM; | |
895 | goto out; | |
896 | } | |
897 | ||
898 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
899 | "%x:%x", &domain, &bus); | |
900 | if (err != 2) { | |
901 | if (err >= 0) | |
902 | err = -EINVAL; | |
903 | xenbus_dev_fatal(pdev->xdev, err, | |
904 | "Error reading PCI root %d", i); | |
905 | goto out; | |
906 | } | |
907 | ||
908 | err = pcifront_scan_root(pdev, domain, bus); | |
909 | if (err) { | |
910 | xenbus_dev_fatal(pdev->xdev, err, | |
911 | "Error scanning PCI root %04x:%02x", | |
912 | domain, bus); | |
913 | goto out; | |
914 | } | |
915 | } | |
916 | ||
917 | err = xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
918 | ||
919 | out: | |
920 | return err; | |
921 | } | |
922 | ||
923 | static int pcifront_try_disconnect(struct pcifront_device *pdev) | |
924 | { | |
925 | int err = 0; | |
926 | enum xenbus_state prev_state; | |
927 | ||
928 | ||
929 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); | |
930 | ||
931 | if (prev_state >= XenbusStateClosing) | |
932 | goto out; | |
933 | ||
934 | if (prev_state == XenbusStateConnected) { | |
935 | pcifront_free_roots(pdev); | |
936 | pcifront_disconnect(pdev); | |
937 | } | |
938 | ||
939 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); | |
940 | ||
941 | out: | |
942 | ||
943 | return err; | |
944 | } | |
945 | ||
15856ad5 | 946 | static int pcifront_attach_devices(struct pcifront_device *pdev) |
956a9202 RW |
947 | { |
948 | int err = -EFAULT; | |
949 | int i, num_roots, len; | |
950 | unsigned int domain, bus; | |
951 | char str[64]; | |
952 | ||
953 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
954 | XenbusStateReconfiguring) | |
955 | goto out; | |
956 | ||
957 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
958 | "root_num", "%d", &num_roots); | |
959 | if (err == -ENOENT) { | |
960 | xenbus_dev_error(pdev->xdev, err, | |
961 | "No PCI Roots found, trying 0000:00"); | |
962 | err = pcifront_rescan_root(pdev, 0, 0); | |
23cf1d00 CG |
963 | if (err) { |
964 | xenbus_dev_fatal(pdev->xdev, err, | |
965 | "Error scanning PCI root 0000:00"); | |
966 | goto out; | |
967 | } | |
956a9202 RW |
968 | num_roots = 0; |
969 | } else if (err != 1) { | |
970 | if (err == 0) | |
971 | err = -EINVAL; | |
972 | xenbus_dev_fatal(pdev->xdev, err, | |
973 | "Error reading number of PCI roots"); | |
974 | goto out; | |
975 | } | |
976 | ||
977 | for (i = 0; i < num_roots; i++) { | |
978 | len = snprintf(str, sizeof(str), "root-%d", i); | |
979 | if (unlikely(len >= (sizeof(str) - 1))) { | |
980 | err = -ENOMEM; | |
981 | goto out; | |
982 | } | |
983 | ||
984 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
985 | "%x:%x", &domain, &bus); | |
986 | if (err != 2) { | |
987 | if (err >= 0) | |
988 | err = -EINVAL; | |
989 | xenbus_dev_fatal(pdev->xdev, err, | |
990 | "Error reading PCI root %d", i); | |
991 | goto out; | |
992 | } | |
993 | ||
994 | err = pcifront_rescan_root(pdev, domain, bus); | |
995 | if (err) { | |
996 | xenbus_dev_fatal(pdev->xdev, err, | |
997 | "Error scanning PCI root %04x:%02x", | |
998 | domain, bus); | |
999 | goto out; | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
1004 | ||
1005 | out: | |
1006 | return err; | |
1007 | } | |
1008 | ||
1009 | static int pcifront_detach_devices(struct pcifront_device *pdev) | |
1010 | { | |
1011 | int err = 0; | |
1012 | int i, num_devs; | |
1013 | unsigned int domain, bus, slot, func; | |
956a9202 RW |
1014 | struct pci_dev *pci_dev; |
1015 | char str[64]; | |
1016 | ||
1017 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
1018 | XenbusStateConnected) | |
1019 | goto out; | |
1020 | ||
1021 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", | |
1022 | &num_devs); | |
1023 | if (err != 1) { | |
1024 | if (err >= 0) | |
1025 | err = -EINVAL; | |
1026 | xenbus_dev_fatal(pdev->xdev, err, | |
1027 | "Error reading number of PCI devices"); | |
1028 | goto out; | |
1029 | } | |
1030 | ||
1031 | /* Find devices being detached and remove them. */ | |
1032 | for (i = 0; i < num_devs; i++) { | |
1033 | int l, state; | |
1034 | l = snprintf(str, sizeof(str), "state-%d", i); | |
1035 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1036 | err = -ENOMEM; | |
1037 | goto out; | |
1038 | } | |
1039 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d", | |
1040 | &state); | |
1041 | if (err != 1) | |
1042 | state = XenbusStateUnknown; | |
1043 | ||
1044 | if (state != XenbusStateClosing) | |
1045 | continue; | |
1046 | ||
1047 | /* Remove device. */ | |
1048 | l = snprintf(str, sizeof(str), "vdev-%d", i); | |
1049 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1050 | err = -ENOMEM; | |
1051 | goto out; | |
1052 | } | |
1053 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
1054 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | |
1055 | if (err != 4) { | |
1056 | if (err >= 0) | |
1057 | err = -EINVAL; | |
1058 | xenbus_dev_fatal(pdev->xdev, err, | |
1059 | "Error reading PCI device %d", i); | |
1060 | goto out; | |
1061 | } | |
1062 | ||
2ccc246d JL |
1063 | pci_dev = pci_get_domain_bus_and_slot(domain, bus, |
1064 | PCI_DEVFN(slot, func)); | |
956a9202 RW |
1065 | if (!pci_dev) { |
1066 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1067 | "Cannot get PCI device %04x:%02x:%02x.%d\n", |
956a9202 RW |
1068 | domain, bus, slot, func); |
1069 | continue; | |
1070 | } | |
a83919e0 | 1071 | pci_lock_rescan_remove(); |
210647af | 1072 | pci_stop_and_remove_bus_device(pci_dev); |
956a9202 | 1073 | pci_dev_put(pci_dev); |
a83919e0 | 1074 | pci_unlock_rescan_remove(); |
956a9202 RW |
1075 | |
1076 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1077 | "PCI device %04x:%02x:%02x.%d removed.\n", |
956a9202 RW |
1078 | domain, bus, slot, func); |
1079 | } | |
1080 | ||
1081 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); | |
1082 | ||
1083 | out: | |
1084 | return err; | |
1085 | } | |
1086 | ||
1087 | static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev, | |
1088 | enum xenbus_state be_state) | |
1089 | { | |
1090 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1091 | ||
1092 | switch (be_state) { | |
1093 | case XenbusStateUnknown: | |
1094 | case XenbusStateInitialising: | |
1095 | case XenbusStateInitWait: | |
1096 | case XenbusStateInitialised: | |
956a9202 RW |
1097 | break; |
1098 | ||
1099 | case XenbusStateConnected: | |
1100 | pcifront_try_connect(pdev); | |
1101 | break; | |
1102 | ||
d5af64de DV |
1103 | case XenbusStateClosed: |
1104 | if (xdev->state == XenbusStateClosed) | |
1105 | break; | |
1106 | /* Missed the backend's CLOSING state -- fallthrough */ | |
956a9202 RW |
1107 | case XenbusStateClosing: |
1108 | dev_warn(&xdev->dev, "backend going away!\n"); | |
1109 | pcifront_try_disconnect(pdev); | |
1110 | break; | |
1111 | ||
1112 | case XenbusStateReconfiguring: | |
1113 | pcifront_detach_devices(pdev); | |
1114 | break; | |
1115 | ||
1116 | case XenbusStateReconfigured: | |
1117 | pcifront_attach_devices(pdev); | |
1118 | break; | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, | |
1123 | const struct xenbus_device_id *id) | |
1124 | { | |
1125 | int err = 0; | |
1126 | struct pcifront_device *pdev = alloc_pdev(xdev); | |
1127 | ||
1128 | if (pdev == NULL) { | |
1129 | err = -ENOMEM; | |
1130 | xenbus_dev_fatal(xdev, err, | |
1131 | "Error allocating pcifront_device struct"); | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | err = pcifront_publish_info(pdev); | |
1136 | if (err) | |
1137 | free_pdev(pdev); | |
1138 | ||
1139 | out: | |
1140 | return err; | |
1141 | } | |
1142 | ||
1143 | static int pcifront_xenbus_remove(struct xenbus_device *xdev) | |
1144 | { | |
1145 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1146 | if (pdev) | |
1147 | free_pdev(pdev); | |
1148 | ||
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | static const struct xenbus_device_id xenpci_ids[] = { | |
1153 | {"pci"}, | |
1154 | {""}, | |
1155 | }; | |
1156 | ||
95afae48 DV |
1157 | static struct xenbus_driver xenpci_driver = { |
1158 | .name = "pcifront", | |
1159 | .ids = xenpci_ids, | |
956a9202 RW |
1160 | .probe = pcifront_xenbus_probe, |
1161 | .remove = pcifront_xenbus_remove, | |
1162 | .otherend_changed = pcifront_backend_changed, | |
95afae48 | 1163 | }; |
956a9202 RW |
1164 | |
1165 | static int __init pcifront_init(void) | |
1166 | { | |
1167 | if (!xen_pv_domain() || xen_initial_domain()) | |
1168 | return -ENODEV; | |
1169 | ||
51c71a3b KRW |
1170 | if (!xen_has_pv_devices()) |
1171 | return -ENODEV; | |
1172 | ||
956a9202 RW |
1173 | pci_frontend_registrar(1 /* enable */); |
1174 | ||
73db144b | 1175 | return xenbus_register_frontend(&xenpci_driver); |
956a9202 RW |
1176 | } |
1177 | ||
1178 | static void __exit pcifront_cleanup(void) | |
1179 | { | |
73db144b | 1180 | xenbus_unregister_driver(&xenpci_driver); |
956a9202 RW |
1181 | pci_frontend_registrar(0 /* disable */); |
1182 | } | |
1183 | module_init(pcifront_init); | |
1184 | module_exit(pcifront_cleanup); | |
1185 | ||
1186 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); | |
1187 | MODULE_LICENSE("GPL"); | |
1188 | MODULE_ALIAS("xen:pci"); |