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 { | |
4d8c8bd6 | 56 | struct pci_sysdata sd; |
956a9202 RW |
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 | { | |
4d8c8bd6 KRW |
70 | /* Because we do not expose that information via XenBus. */ |
71 | sd->sd.node = first_online_node; | |
72 | sd->sd.domain = domain; | |
956a9202 RW |
73 | sd->pdev = pdev; |
74 | } | |
75 | ||
76 | static DEFINE_SPINLOCK(pcifront_dev_lock); | |
77 | static struct pcifront_device *pcifront_dev; | |
78 | ||
79 | static int verbose_request; | |
80 | module_param(verbose_request, int, 0644); | |
81 | ||
82 | static int errno_to_pcibios_err(int errno) | |
83 | { | |
84 | switch (errno) { | |
85 | case XEN_PCI_ERR_success: | |
86 | return PCIBIOS_SUCCESSFUL; | |
87 | ||
88 | case XEN_PCI_ERR_dev_not_found: | |
89 | return PCIBIOS_DEVICE_NOT_FOUND; | |
90 | ||
91 | case XEN_PCI_ERR_invalid_offset: | |
92 | case XEN_PCI_ERR_op_failed: | |
93 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
94 | ||
95 | case XEN_PCI_ERR_not_implemented: | |
96 | return PCIBIOS_FUNC_NOT_SUPPORTED; | |
97 | ||
98 | case XEN_PCI_ERR_access_denied: | |
99 | return PCIBIOS_SET_FAILED; | |
100 | } | |
101 | return errno; | |
102 | } | |
103 | ||
104 | static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev) | |
105 | { | |
106 | if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags) | |
107 | && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) { | |
108 | dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n"); | |
109 | schedule_work(&pdev->op_work); | |
110 | } | |
111 | } | |
112 | ||
113 | static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) | |
114 | { | |
115 | int err = 0; | |
116 | struct xen_pci_op *active_op = &pdev->sh_info->op; | |
117 | unsigned long irq_flags; | |
118 | evtchn_port_t port = pdev->evtchn; | |
119 | unsigned irq = pdev->irq; | |
120 | s64 ns, ns_timeout; | |
956a9202 RW |
121 | |
122 | spin_lock_irqsave(&pdev->sh_info_lock, irq_flags); | |
123 | ||
124 | memcpy(active_op, op, sizeof(struct xen_pci_op)); | |
125 | ||
126 | /* Go */ | |
127 | wmb(); | |
128 | set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags); | |
129 | notify_remote_via_evtchn(port); | |
130 | ||
131 | /* | |
132 | * We set a poll timeout of 3 seconds but give up on return after | |
133 | * 2 seconds. It is better to time out too late rather than too early | |
134 | * (in the latter case we end up continually re-executing poll() with a | |
135 | * timeout in the past). 1s difference gives plenty of slack for error. | |
136 | */ | |
e1d5bbcd | 137 | ns_timeout = ktime_get_ns() + 2 * (s64)NSEC_PER_SEC; |
956a9202 RW |
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); | |
e1d5bbcd | 145 | ns = ktime_get_ns(); |
956a9202 RW |
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; | |
5004e98a | 270 | for_each_pci_msi_entry(entry, dev) { |
956a9202 RW |
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; | |
515d425b | 449 | LIST_HEAD(resources); |
956a9202 RW |
450 | struct pcifront_sd *sd = NULL; |
451 | struct pci_bus_entry *bus_entry = NULL; | |
452 | int err = 0; | |
515d425b AB |
453 | static struct resource busn_res = { |
454 | .start = 0, | |
455 | .end = 255, | |
456 | .flags = IORESOURCE_BUS, | |
457 | }; | |
956a9202 RW |
458 | |
459 | #ifndef CONFIG_PCI_DOMAINS | |
460 | if (domain != 0) { | |
461 | dev_err(&pdev->xdev->dev, | |
462 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
463 | dev_err(&pdev->xdev->dev, | |
464 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
465 | err = -EINVAL; | |
466 | goto err_out; | |
467 | } | |
468 | #endif | |
469 | ||
470 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", | |
471 | domain, bus); | |
472 | ||
4d8c8bd6 KRW |
473 | bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL); |
474 | sd = kzalloc(sizeof(*sd), GFP_KERNEL); | |
956a9202 RW |
475 | if (!bus_entry || !sd) { |
476 | err = -ENOMEM; | |
477 | goto err_out; | |
478 | } | |
515d425b AB |
479 | pci_add_resource(&resources, &ioport_resource); |
480 | pci_add_resource(&resources, &iomem_resource); | |
481 | pci_add_resource(&resources, &busn_res); | |
956a9202 RW |
482 | pcifront_init_sd(sd, domain, bus, pdev); |
483 | ||
a83919e0 RW |
484 | pci_lock_rescan_remove(); |
485 | ||
515d425b AB |
486 | b = pci_scan_root_bus(&pdev->xdev->dev, bus, |
487 | &pcifront_bus_ops, sd, &resources); | |
956a9202 RW |
488 | if (!b) { |
489 | dev_err(&pdev->xdev->dev, | |
490 | "Error creating PCI Frontend Bus!\n"); | |
491 | err = -ENOMEM; | |
a83919e0 | 492 | pci_unlock_rescan_remove(); |
515d425b | 493 | pci_free_resource_list(&resources); |
956a9202 RW |
494 | goto err_out; |
495 | } | |
496 | ||
497 | bus_entry->bus = b; | |
498 | ||
499 | list_add(&bus_entry->list, &pdev->root_buses); | |
500 | ||
515d425b | 501 | /* pci_scan_root_bus skips devices which do not have a |
956a9202 RW |
502 | * devfn==0. The pcifront_scan_bus enumerates all devfn. */ |
503 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
504 | ||
505 | /* Claim resources before going "live" with our devices */ | |
506 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
507 | ||
508 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
509 | pci_bus_add_devices(b); | |
510 | ||
a83919e0 | 511 | pci_unlock_rescan_remove(); |
956a9202 RW |
512 | return err; |
513 | ||
514 | err_out: | |
515 | kfree(bus_entry); | |
516 | kfree(sd); | |
517 | ||
518 | return err; | |
519 | } | |
520 | ||
15856ad5 | 521 | static int pcifront_rescan_root(struct pcifront_device *pdev, |
956a9202 RW |
522 | unsigned int domain, unsigned int bus) |
523 | { | |
524 | int err; | |
525 | struct pci_bus *b; | |
526 | ||
527 | #ifndef CONFIG_PCI_DOMAINS | |
528 | if (domain != 0) { | |
529 | dev_err(&pdev->xdev->dev, | |
530 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
531 | dev_err(&pdev->xdev->dev, | |
532 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
533 | return -EINVAL; | |
534 | } | |
535 | #endif | |
536 | ||
537 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", | |
538 | domain, bus); | |
539 | ||
540 | b = pci_find_bus(domain, bus); | |
541 | if (!b) | |
542 | /* If the bus is unknown, create it. */ | |
543 | return pcifront_scan_root(pdev, domain, bus); | |
544 | ||
545 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
546 | ||
547 | /* Claim resources before going "live" with our devices */ | |
548 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
549 | ||
550 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
551 | pci_bus_add_devices(b); | |
552 | ||
553 | return err; | |
554 | } | |
555 | ||
556 | static void free_root_bus_devs(struct pci_bus *bus) | |
557 | { | |
558 | struct pci_dev *dev; | |
559 | ||
560 | while (!list_empty(&bus->devices)) { | |
561 | dev = container_of(bus->devices.next, struct pci_dev, | |
562 | bus_list); | |
563 | dev_dbg(&dev->dev, "removing device\n"); | |
210647af | 564 | pci_stop_and_remove_bus_device(dev); |
956a9202 RW |
565 | } |
566 | } | |
567 | ||
568 | static void pcifront_free_roots(struct pcifront_device *pdev) | |
569 | { | |
570 | struct pci_bus_entry *bus_entry, *t; | |
571 | ||
572 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); | |
573 | ||
a83919e0 | 574 | pci_lock_rescan_remove(); |
956a9202 RW |
575 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { |
576 | list_del(&bus_entry->list); | |
577 | ||
578 | free_root_bus_devs(bus_entry->bus); | |
579 | ||
580 | kfree(bus_entry->bus->sysdata); | |
581 | ||
582 | device_unregister(bus_entry->bus->bridge); | |
583 | pci_remove_bus(bus_entry->bus); | |
584 | ||
585 | kfree(bus_entry); | |
586 | } | |
a83919e0 | 587 | pci_unlock_rescan_remove(); |
956a9202 RW |
588 | } |
589 | ||
590 | static pci_ers_result_t pcifront_common_process(int cmd, | |
591 | struct pcifront_device *pdev, | |
592 | pci_channel_state_t state) | |
593 | { | |
594 | pci_ers_result_t result; | |
595 | struct pci_driver *pdrv; | |
596 | int bus = pdev->sh_info->aer_op.bus; | |
597 | int devfn = pdev->sh_info->aer_op.devfn; | |
598 | struct pci_dev *pcidev; | |
599 | int flag = 0; | |
600 | ||
601 | dev_dbg(&pdev->xdev->dev, | |
602 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", | |
603 | cmd, bus, devfn); | |
604 | result = PCI_ERS_RESULT_NONE; | |
605 | ||
606 | pcidev = pci_get_bus_and_slot(bus, devfn); | |
607 | if (!pcidev || !pcidev->driver) { | |
2a63dd72 | 608 | dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); |
ff0387c3 | 609 | pci_dev_put(pcidev); |
956a9202 RW |
610 | return result; |
611 | } | |
612 | pdrv = pcidev->driver; | |
613 | ||
07d25146 | 614 | if (pdrv) { |
956a9202 RW |
615 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { |
616 | dev_dbg(&pcidev->dev, | |
617 | "trying to call AER service\n"); | |
618 | if (pcidev) { | |
619 | flag = 1; | |
620 | switch (cmd) { | |
621 | case XEN_PCI_OP_aer_detected: | |
622 | result = pdrv->err_handler-> | |
623 | error_detected(pcidev, state); | |
624 | break; | |
625 | case XEN_PCI_OP_aer_mmio: | |
626 | result = pdrv->err_handler-> | |
627 | mmio_enabled(pcidev); | |
628 | break; | |
629 | case XEN_PCI_OP_aer_slotreset: | |
630 | result = pdrv->err_handler-> | |
631 | slot_reset(pcidev); | |
632 | break; | |
633 | case XEN_PCI_OP_aer_resume: | |
634 | pdrv->err_handler->resume(pcidev); | |
635 | break; | |
636 | default: | |
637 | dev_err(&pdev->xdev->dev, | |
638 | "bad request in aer recovery " | |
639 | "operation!\n"); | |
640 | ||
641 | } | |
642 | } | |
643 | } | |
956a9202 RW |
644 | } |
645 | if (!flag) | |
646 | result = PCI_ERS_RESULT_NONE; | |
647 | ||
648 | return result; | |
649 | } | |
650 | ||
651 | ||
652 | static void pcifront_do_aer(struct work_struct *data) | |
653 | { | |
654 | struct pcifront_device *pdev = | |
655 | container_of(data, struct pcifront_device, op_work); | |
656 | int cmd = pdev->sh_info->aer_op.cmd; | |
657 | pci_channel_state_t state = | |
658 | (pci_channel_state_t)pdev->sh_info->aer_op.err; | |
659 | ||
660 | /*If a pci_conf op is in progress, | |
661 | we have to wait until it is done before service aer op*/ | |
662 | dev_dbg(&pdev->xdev->dev, | |
663 | "pcifront service aer bus %x devfn %x\n", | |
664 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); | |
665 | ||
666 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); | |
667 | ||
668 | /* Post the operation to the guest. */ | |
669 | wmb(); | |
670 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); | |
671 | notify_remote_via_evtchn(pdev->evtchn); | |
672 | ||
673 | /*in case of we lost an aer request in four lines time_window*/ | |
4e857c58 | 674 | smp_mb__before_atomic(); |
956a9202 | 675 | clear_bit(_PDEVB_op_active, &pdev->flags); |
4e857c58 | 676 | smp_mb__after_atomic(); |
956a9202 RW |
677 | |
678 | schedule_pcifront_aer_op(pdev); | |
679 | ||
680 | } | |
681 | ||
682 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) | |
683 | { | |
684 | struct pcifront_device *pdev = dev; | |
685 | schedule_pcifront_aer_op(pdev); | |
686 | return IRQ_HANDLED; | |
687 | } | |
3d925320 | 688 | static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) |
956a9202 RW |
689 | { |
690 | int err = 0; | |
691 | ||
692 | spin_lock(&pcifront_dev_lock); | |
693 | ||
694 | if (!pcifront_dev) { | |
695 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); | |
696 | pcifront_dev = pdev; | |
098b1aea | 697 | } else |
956a9202 | 698 | err = -EEXIST; |
098b1aea | 699 | |
956a9202 RW |
700 | spin_unlock(&pcifront_dev_lock); |
701 | ||
3d925320 KRW |
702 | if (!err && !swiotlb_nr_tbl()) { |
703 | err = pci_xen_swiotlb_init_late(); | |
704 | if (err) | |
705 | dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); | |
706 | } | |
956a9202 RW |
707 | return err; |
708 | } | |
709 | ||
710 | static void pcifront_disconnect(struct pcifront_device *pdev) | |
711 | { | |
712 | spin_lock(&pcifront_dev_lock); | |
713 | ||
714 | if (pdev == pcifront_dev) { | |
715 | dev_info(&pdev->xdev->dev, | |
716 | "Disconnecting PCI Frontend Buses\n"); | |
717 | pcifront_dev = NULL; | |
718 | } | |
719 | ||
720 | spin_unlock(&pcifront_dev_lock); | |
721 | } | |
722 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) | |
723 | { | |
724 | struct pcifront_device *pdev; | |
725 | ||
726 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); | |
727 | if (pdev == NULL) | |
728 | goto out; | |
729 | ||
730 | pdev->sh_info = | |
731 | (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL); | |
732 | if (pdev->sh_info == NULL) { | |
733 | kfree(pdev); | |
734 | pdev = NULL; | |
735 | goto out; | |
736 | } | |
737 | pdev->sh_info->flags = 0; | |
738 | ||
739 | /*Flag for registering PV AER handler*/ | |
740 | set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags); | |
741 | ||
742 | dev_set_drvdata(&xdev->dev, pdev); | |
743 | pdev->xdev = xdev; | |
744 | ||
745 | INIT_LIST_HEAD(&pdev->root_buses); | |
746 | ||
747 | spin_lock_init(&pdev->sh_info_lock); | |
748 | ||
749 | pdev->evtchn = INVALID_EVTCHN; | |
750 | pdev->gnt_ref = INVALID_GRANT_REF; | |
751 | pdev->irq = -1; | |
752 | ||
753 | INIT_WORK(&pdev->op_work, pcifront_do_aer); | |
754 | ||
755 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", | |
756 | pdev, pdev->sh_info); | |
757 | out: | |
758 | return pdev; | |
759 | } | |
760 | ||
761 | static void free_pdev(struct pcifront_device *pdev) | |
762 | { | |
763 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); | |
764 | ||
765 | pcifront_free_roots(pdev); | |
766 | ||
db2e2e6e | 767 | cancel_work_sync(&pdev->op_work); |
956a9202 RW |
768 | |
769 | if (pdev->irq >= 0) | |
770 | unbind_from_irqhandler(pdev->irq, pdev); | |
771 | ||
772 | if (pdev->evtchn != INVALID_EVTCHN) | |
773 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); | |
774 | ||
775 | if (pdev->gnt_ref != INVALID_GRANT_REF) | |
776 | gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */, | |
777 | (unsigned long)pdev->sh_info); | |
778 | else | |
779 | free_page((unsigned long)pdev->sh_info); | |
780 | ||
781 | dev_set_drvdata(&pdev->xdev->dev, NULL); | |
782 | ||
783 | kfree(pdev); | |
784 | } | |
785 | ||
786 | static int pcifront_publish_info(struct pcifront_device *pdev) | |
787 | { | |
788 | int err = 0; | |
789 | struct xenbus_transaction trans; | |
ccc9d90a | 790 | grant_ref_t gref; |
956a9202 | 791 | |
ccc9d90a | 792 | err = xenbus_grant_ring(pdev->xdev, pdev->sh_info, 1, &gref); |
956a9202 RW |
793 | if (err < 0) |
794 | goto out; | |
795 | ||
ccc9d90a | 796 | pdev->gnt_ref = gref; |
956a9202 RW |
797 | |
798 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); | |
799 | if (err) | |
800 | goto out; | |
801 | ||
802 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, | |
803 | 0, "pcifront", pdev); | |
804 | ||
805 | if (err < 0) | |
806 | return err; | |
807 | ||
808 | pdev->irq = err; | |
809 | ||
810 | do_publish: | |
811 | err = xenbus_transaction_start(&trans); | |
812 | if (err) { | |
813 | xenbus_dev_fatal(pdev->xdev, err, | |
814 | "Error writing configuration for backend " | |
815 | "(start transaction)"); | |
816 | goto out; | |
817 | } | |
818 | ||
819 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
820 | "pci-op-ref", "%u", pdev->gnt_ref); | |
821 | if (!err) | |
822 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
823 | "event-channel", "%u", pdev->evtchn); | |
824 | if (!err) | |
825 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
826 | "magic", XEN_PCI_MAGIC); | |
827 | ||
828 | if (err) { | |
829 | xenbus_transaction_end(trans, 1); | |
830 | xenbus_dev_fatal(pdev->xdev, err, | |
831 | "Error writing configuration for backend"); | |
832 | goto out; | |
833 | } else { | |
834 | err = xenbus_transaction_end(trans, 0); | |
835 | if (err == -EAGAIN) | |
836 | goto do_publish; | |
837 | else if (err) { | |
838 | xenbus_dev_fatal(pdev->xdev, err, | |
839 | "Error completing transaction " | |
840 | "for backend"); | |
841 | goto out; | |
842 | } | |
843 | } | |
844 | ||
845 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | |
846 | ||
847 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); | |
848 | ||
849 | out: | |
850 | return err; | |
851 | } | |
852 | ||
15856ad5 | 853 | static int pcifront_try_connect(struct pcifront_device *pdev) |
956a9202 RW |
854 | { |
855 | int err = -EFAULT; | |
856 | int i, num_roots, len; | |
857 | char str[64]; | |
858 | unsigned int domain, bus; | |
859 | ||
860 | ||
861 | /* Only connect once */ | |
862 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
863 | XenbusStateInitialised) | |
864 | goto out; | |
865 | ||
3d925320 | 866 | err = pcifront_connect_and_init_dma(pdev); |
098b1aea | 867 | if (err && err != -EEXIST) { |
956a9202 | 868 | xenbus_dev_fatal(pdev->xdev, err, |
3d925320 | 869 | "Error setting up PCI Frontend"); |
956a9202 RW |
870 | goto out; |
871 | } | |
872 | ||
873 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
874 | "root_num", "%d", &num_roots); | |
875 | if (err == -ENOENT) { | |
876 | xenbus_dev_error(pdev->xdev, err, | |
877 | "No PCI Roots found, trying 0000:00"); | |
878 | err = pcifront_scan_root(pdev, 0, 0); | |
23cf1d00 CG |
879 | if (err) { |
880 | xenbus_dev_fatal(pdev->xdev, err, | |
881 | "Error scanning PCI root 0000:00"); | |
882 | goto out; | |
883 | } | |
956a9202 RW |
884 | num_roots = 0; |
885 | } else if (err != 1) { | |
886 | if (err == 0) | |
887 | err = -EINVAL; | |
888 | xenbus_dev_fatal(pdev->xdev, err, | |
889 | "Error reading number of PCI roots"); | |
890 | goto out; | |
891 | } | |
892 | ||
893 | for (i = 0; i < num_roots; i++) { | |
894 | len = snprintf(str, sizeof(str), "root-%d", i); | |
895 | if (unlikely(len >= (sizeof(str) - 1))) { | |
896 | err = -ENOMEM; | |
897 | goto out; | |
898 | } | |
899 | ||
900 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
901 | "%x:%x", &domain, &bus); | |
902 | if (err != 2) { | |
903 | if (err >= 0) | |
904 | err = -EINVAL; | |
905 | xenbus_dev_fatal(pdev->xdev, err, | |
906 | "Error reading PCI root %d", i); | |
907 | goto out; | |
908 | } | |
909 | ||
910 | err = pcifront_scan_root(pdev, domain, bus); | |
911 | if (err) { | |
912 | xenbus_dev_fatal(pdev->xdev, err, | |
913 | "Error scanning PCI root %04x:%02x", | |
914 | domain, bus); | |
915 | goto out; | |
916 | } | |
917 | } | |
918 | ||
919 | err = xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
920 | ||
921 | out: | |
922 | return err; | |
923 | } | |
924 | ||
925 | static int pcifront_try_disconnect(struct pcifront_device *pdev) | |
926 | { | |
927 | int err = 0; | |
928 | enum xenbus_state prev_state; | |
929 | ||
930 | ||
931 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); | |
932 | ||
933 | if (prev_state >= XenbusStateClosing) | |
934 | goto out; | |
935 | ||
936 | if (prev_state == XenbusStateConnected) { | |
937 | pcifront_free_roots(pdev); | |
938 | pcifront_disconnect(pdev); | |
939 | } | |
940 | ||
941 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); | |
942 | ||
943 | out: | |
944 | ||
945 | return err; | |
946 | } | |
947 | ||
15856ad5 | 948 | static int pcifront_attach_devices(struct pcifront_device *pdev) |
956a9202 RW |
949 | { |
950 | int err = -EFAULT; | |
951 | int i, num_roots, len; | |
952 | unsigned int domain, bus; | |
953 | char str[64]; | |
954 | ||
955 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
956 | XenbusStateReconfiguring) | |
957 | goto out; | |
958 | ||
959 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
960 | "root_num", "%d", &num_roots); | |
961 | if (err == -ENOENT) { | |
962 | xenbus_dev_error(pdev->xdev, err, | |
963 | "No PCI Roots found, trying 0000:00"); | |
964 | err = pcifront_rescan_root(pdev, 0, 0); | |
23cf1d00 CG |
965 | if (err) { |
966 | xenbus_dev_fatal(pdev->xdev, err, | |
967 | "Error scanning PCI root 0000:00"); | |
968 | goto out; | |
969 | } | |
956a9202 RW |
970 | num_roots = 0; |
971 | } else if (err != 1) { | |
972 | if (err == 0) | |
973 | err = -EINVAL; | |
974 | xenbus_dev_fatal(pdev->xdev, err, | |
975 | "Error reading number of PCI roots"); | |
976 | goto out; | |
977 | } | |
978 | ||
979 | for (i = 0; i < num_roots; i++) { | |
980 | len = snprintf(str, sizeof(str), "root-%d", i); | |
981 | if (unlikely(len >= (sizeof(str) - 1))) { | |
982 | err = -ENOMEM; | |
983 | goto out; | |
984 | } | |
985 | ||
986 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
987 | "%x:%x", &domain, &bus); | |
988 | if (err != 2) { | |
989 | if (err >= 0) | |
990 | err = -EINVAL; | |
991 | xenbus_dev_fatal(pdev->xdev, err, | |
992 | "Error reading PCI root %d", i); | |
993 | goto out; | |
994 | } | |
995 | ||
996 | err = pcifront_rescan_root(pdev, domain, bus); | |
997 | if (err) { | |
998 | xenbus_dev_fatal(pdev->xdev, err, | |
999 | "Error scanning PCI root %04x:%02x", | |
1000 | domain, bus); | |
1001 | goto out; | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
1006 | ||
1007 | out: | |
1008 | return err; | |
1009 | } | |
1010 | ||
1011 | static int pcifront_detach_devices(struct pcifront_device *pdev) | |
1012 | { | |
1013 | int err = 0; | |
1014 | int i, num_devs; | |
1015 | unsigned int domain, bus, slot, func; | |
956a9202 RW |
1016 | struct pci_dev *pci_dev; |
1017 | char str[64]; | |
1018 | ||
1019 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
1020 | XenbusStateConnected) | |
1021 | goto out; | |
1022 | ||
1023 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", | |
1024 | &num_devs); | |
1025 | if (err != 1) { | |
1026 | if (err >= 0) | |
1027 | err = -EINVAL; | |
1028 | xenbus_dev_fatal(pdev->xdev, err, | |
1029 | "Error reading number of PCI devices"); | |
1030 | goto out; | |
1031 | } | |
1032 | ||
1033 | /* Find devices being detached and remove them. */ | |
1034 | for (i = 0; i < num_devs; i++) { | |
1035 | int l, state; | |
1036 | l = snprintf(str, sizeof(str), "state-%d", i); | |
1037 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1038 | err = -ENOMEM; | |
1039 | goto out; | |
1040 | } | |
1041 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d", | |
1042 | &state); | |
1043 | if (err != 1) | |
1044 | state = XenbusStateUnknown; | |
1045 | ||
1046 | if (state != XenbusStateClosing) | |
1047 | continue; | |
1048 | ||
1049 | /* Remove device. */ | |
1050 | l = snprintf(str, sizeof(str), "vdev-%d", i); | |
1051 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1052 | err = -ENOMEM; | |
1053 | goto out; | |
1054 | } | |
1055 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
1056 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | |
1057 | if (err != 4) { | |
1058 | if (err >= 0) | |
1059 | err = -EINVAL; | |
1060 | xenbus_dev_fatal(pdev->xdev, err, | |
1061 | "Error reading PCI device %d", i); | |
1062 | goto out; | |
1063 | } | |
1064 | ||
2ccc246d JL |
1065 | pci_dev = pci_get_domain_bus_and_slot(domain, bus, |
1066 | PCI_DEVFN(slot, func)); | |
956a9202 RW |
1067 | if (!pci_dev) { |
1068 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1069 | "Cannot get PCI device %04x:%02x:%02x.%d\n", |
956a9202 RW |
1070 | domain, bus, slot, func); |
1071 | continue; | |
1072 | } | |
a83919e0 | 1073 | pci_lock_rescan_remove(); |
210647af | 1074 | pci_stop_and_remove_bus_device(pci_dev); |
956a9202 | 1075 | pci_dev_put(pci_dev); |
a83919e0 | 1076 | pci_unlock_rescan_remove(); |
956a9202 RW |
1077 | |
1078 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1079 | "PCI device %04x:%02x:%02x.%d removed.\n", |
956a9202 RW |
1080 | domain, bus, slot, func); |
1081 | } | |
1082 | ||
1083 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); | |
1084 | ||
1085 | out: | |
1086 | return err; | |
1087 | } | |
1088 | ||
1089 | static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev, | |
1090 | enum xenbus_state be_state) | |
1091 | { | |
1092 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1093 | ||
1094 | switch (be_state) { | |
1095 | case XenbusStateUnknown: | |
1096 | case XenbusStateInitialising: | |
1097 | case XenbusStateInitWait: | |
1098 | case XenbusStateInitialised: | |
956a9202 RW |
1099 | break; |
1100 | ||
1101 | case XenbusStateConnected: | |
1102 | pcifront_try_connect(pdev); | |
1103 | break; | |
1104 | ||
d5af64de DV |
1105 | case XenbusStateClosed: |
1106 | if (xdev->state == XenbusStateClosed) | |
1107 | break; | |
1108 | /* Missed the backend's CLOSING state -- fallthrough */ | |
956a9202 RW |
1109 | case XenbusStateClosing: |
1110 | dev_warn(&xdev->dev, "backend going away!\n"); | |
1111 | pcifront_try_disconnect(pdev); | |
1112 | break; | |
1113 | ||
1114 | case XenbusStateReconfiguring: | |
1115 | pcifront_detach_devices(pdev); | |
1116 | break; | |
1117 | ||
1118 | case XenbusStateReconfigured: | |
1119 | pcifront_attach_devices(pdev); | |
1120 | break; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, | |
1125 | const struct xenbus_device_id *id) | |
1126 | { | |
1127 | int err = 0; | |
1128 | struct pcifront_device *pdev = alloc_pdev(xdev); | |
1129 | ||
1130 | if (pdev == NULL) { | |
1131 | err = -ENOMEM; | |
1132 | xenbus_dev_fatal(xdev, err, | |
1133 | "Error allocating pcifront_device struct"); | |
1134 | goto out; | |
1135 | } | |
1136 | ||
1137 | err = pcifront_publish_info(pdev); | |
1138 | if (err) | |
1139 | free_pdev(pdev); | |
1140 | ||
1141 | out: | |
1142 | return err; | |
1143 | } | |
1144 | ||
1145 | static int pcifront_xenbus_remove(struct xenbus_device *xdev) | |
1146 | { | |
1147 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1148 | if (pdev) | |
1149 | free_pdev(pdev); | |
1150 | ||
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | static const struct xenbus_device_id xenpci_ids[] = { | |
1155 | {"pci"}, | |
1156 | {""}, | |
1157 | }; | |
1158 | ||
95afae48 DV |
1159 | static struct xenbus_driver xenpci_driver = { |
1160 | .name = "pcifront", | |
1161 | .ids = xenpci_ids, | |
956a9202 RW |
1162 | .probe = pcifront_xenbus_probe, |
1163 | .remove = pcifront_xenbus_remove, | |
1164 | .otherend_changed = pcifront_backend_changed, | |
95afae48 | 1165 | }; |
956a9202 RW |
1166 | |
1167 | static int __init pcifront_init(void) | |
1168 | { | |
1169 | if (!xen_pv_domain() || xen_initial_domain()) | |
1170 | return -ENODEV; | |
1171 | ||
51c71a3b KRW |
1172 | if (!xen_has_pv_devices()) |
1173 | return -ENODEV; | |
1174 | ||
956a9202 RW |
1175 | pci_frontend_registrar(1 /* enable */); |
1176 | ||
73db144b | 1177 | return xenbus_register_frontend(&xenpci_driver); |
956a9202 RW |
1178 | } |
1179 | ||
1180 | static void __exit pcifront_cleanup(void) | |
1181 | { | |
73db144b | 1182 | xenbus_unregister_driver(&xenpci_driver); |
956a9202 RW |
1183 | pci_frontend_registrar(0 /* disable */); |
1184 | } | |
1185 | module_init(pcifront_init); | |
1186 | module_exit(pcifront_cleanup); | |
1187 | ||
1188 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); | |
1189 | MODULE_LICENSE("GPL"); | |
1190 | MODULE_ALIAS("xen:pci"); |