Commit | Line | Data |
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7328c8f4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
956a9202 | 2 | /* |
df62ab5e | 3 | * Xen PCI Frontend |
956a9202 | 4 | * |
df62ab5e | 5 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> |
956a9202 RW |
6 | */ |
7 | #include <linux/module.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/mm.h> | |
10 | #include <xen/xenbus.h> | |
11 | #include <xen/events.h> | |
12 | #include <xen/grant_table.h> | |
13 | #include <xen/page.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/pci.h> | |
16 | #include <linux/msi.h> | |
956a9202 RW |
17 | #include <xen/interface/io/pciif.h> |
18 | #include <asm/xen/pci.h> | |
19 | #include <linux/interrupt.h> | |
60063497 | 20 | #include <linux/atomic.h> |
956a9202 RW |
21 | #include <linux/workqueue.h> |
22 | #include <linux/bitops.h> | |
23 | #include <linux/time.h> | |
e1d5bbcd | 24 | #include <linux/ktime.h> |
51c71a3b | 25 | #include <xen/platform_pci.h> |
956a9202 | 26 | |
3d925320 | 27 | #include <asm/xen/swiotlb-xen.h> |
bce21a2b | 28 | |
956a9202 RW |
29 | #define INVALID_EVTCHN (-1) |
30 | ||
31 | struct pci_bus_entry { | |
32 | struct list_head list; | |
33 | struct pci_bus *bus; | |
34 | }; | |
35 | ||
36 | #define _PDEVB_op_active (0) | |
37 | #define PDEVB_op_active (1 << (_PDEVB_op_active)) | |
38 | ||
39 | struct pcifront_device { | |
40 | struct xenbus_device *xdev; | |
41 | struct list_head root_buses; | |
42 | ||
43 | int evtchn; | |
bce21a2b | 44 | grant_ref_t gnt_ref; |
956a9202 RW |
45 | |
46 | int irq; | |
47 | ||
48 | /* Lock this when doing any operations in sh_info */ | |
49 | spinlock_t sh_info_lock; | |
50 | struct xen_pci_sharedinfo *sh_info; | |
51 | struct work_struct op_work; | |
52 | unsigned long flags; | |
53 | ||
54 | }; | |
55 | ||
56 | struct pcifront_sd { | |
4d8c8bd6 | 57 | struct pci_sysdata sd; |
956a9202 RW |
58 | struct pcifront_device *pdev; |
59 | }; | |
60 | ||
61 | static inline struct pcifront_device * | |
62 | pcifront_get_pdev(struct pcifront_sd *sd) | |
63 | { | |
64 | return sd->pdev; | |
65 | } | |
66 | ||
67 | static inline void pcifront_init_sd(struct pcifront_sd *sd, | |
68 | unsigned int domain, unsigned int bus, | |
69 | struct pcifront_device *pdev) | |
70 | { | |
4d8c8bd6 KRW |
71 | /* Because we do not expose that information via XenBus. */ |
72 | sd->sd.node = first_online_node; | |
73 | sd->sd.domain = domain; | |
956a9202 RW |
74 | sd->pdev = pdev; |
75 | } | |
76 | ||
77 | static DEFINE_SPINLOCK(pcifront_dev_lock); | |
78 | static struct pcifront_device *pcifront_dev; | |
79 | ||
956a9202 RW |
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; | |
f956c1b0 | 117 | unsigned int irq = pdev->irq; |
956a9202 | 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 | /* | |
f956c1b0 SMI |
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 | */ | |
956a9202 RW |
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 | ||
4969a3a2 BO |
190 | dev_dbg(&pdev->xdev->dev, |
191 | "read dev=%04x:%02x:%02x.%d - offset %x size %d\n", | |
192 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), | |
193 | PCI_FUNC(devfn), where, size); | |
956a9202 RW |
194 | |
195 | err = do_pci_op(pdev, &op); | |
196 | ||
197 | if (likely(!err)) { | |
4969a3a2 BO |
198 | dev_dbg(&pdev->xdev->dev, "read got back value %x\n", |
199 | op.value); | |
956a9202 RW |
200 | |
201 | *val = op.value; | |
202 | } else if (err == -ENODEV) { | |
203 | /* No device here, pretend that it just returned 0 */ | |
204 | err = 0; | |
205 | *val = 0; | |
206 | } | |
207 | ||
208 | return errno_to_pcibios_err(err); | |
209 | } | |
210 | ||
211 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
212 | static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn, | |
213 | int where, int size, u32 val) | |
214 | { | |
215 | struct xen_pci_op op = { | |
216 | .cmd = XEN_PCI_OP_conf_write, | |
217 | .domain = pci_domain_nr(bus), | |
218 | .bus = bus->number, | |
219 | .devfn = devfn, | |
220 | .offset = where, | |
221 | .size = size, | |
222 | .value = val, | |
223 | }; | |
224 | struct pcifront_sd *sd = bus->sysdata; | |
225 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
226 | ||
4969a3a2 BO |
227 | dev_dbg(&pdev->xdev->dev, |
228 | "write dev=%04x:%02x:%02x.%d - offset %x size %d val %x\n", | |
229 | pci_domain_nr(bus), bus->number, | |
230 | PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); | |
956a9202 RW |
231 | |
232 | return errno_to_pcibios_err(do_pci_op(pdev, &op)); | |
233 | } | |
234 | ||
b8b0f559 | 235 | static struct pci_ops pcifront_bus_ops = { |
956a9202 RW |
236 | .read = pcifront_bus_read, |
237 | .write = pcifront_bus_write, | |
238 | }; | |
239 | ||
240 | #ifdef CONFIG_PCI_MSI | |
241 | static int pci_frontend_enable_msix(struct pci_dev *dev, | |
cc0f89c4 | 242 | int vector[], int nvec) |
956a9202 RW |
243 | { |
244 | int err; | |
245 | int i; | |
246 | struct xen_pci_op op = { | |
247 | .cmd = XEN_PCI_OP_enable_msix, | |
248 | .domain = pci_domain_nr(dev->bus), | |
249 | .bus = dev->bus->number, | |
250 | .devfn = dev->devfn, | |
251 | .value = nvec, | |
252 | }; | |
253 | struct pcifront_sd *sd = dev->bus->sysdata; | |
254 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
255 | struct msi_desc *entry; | |
256 | ||
257 | if (nvec > SH_INFO_MAX_VEC) { | |
7506dc79 FL |
258 | pci_err(dev, "too many vectors (0x%x) for PCI frontend:" |
259 | " Increase SH_INFO_MAX_VEC\n", nvec); | |
956a9202 RW |
260 | return -EINVAL; |
261 | } | |
262 | ||
263 | i = 0; | |
3d31bbd3 | 264 | msi_for_each_desc(entry, &dev->dev, MSI_DESC_NOTASSOCIATED) { |
173ffad7 | 265 | op.msix_entries[i].entry = entry->msi_index; |
956a9202 RW |
266 | /* Vector is useless at this point. */ |
267 | op.msix_entries[i].vector = -1; | |
268 | i++; | |
269 | } | |
270 | ||
271 | err = do_pci_op(pdev, &op); | |
272 | ||
273 | if (likely(!err)) { | |
274 | if (likely(!op.value)) { | |
275 | /* we get the result */ | |
1d461052 KRW |
276 | for (i = 0; i < nvec; i++) { |
277 | if (op.msix_entries[i].vector <= 0) { | |
7506dc79 | 278 | pci_warn(dev, "MSI-X entry %d is invalid: %d!\n", |
1d461052 KRW |
279 | i, op.msix_entries[i].vector); |
280 | err = -EINVAL; | |
cc0f89c4 | 281 | vector[i] = -1; |
1d461052 KRW |
282 | continue; |
283 | } | |
cc0f89c4 | 284 | vector[i] = op.msix_entries[i].vector; |
1d461052 | 285 | } |
956a9202 | 286 | } else { |
34c6b710 | 287 | pr_info("enable msix get value %x\n", op.value); |
f09d8432 | 288 | err = op.value; |
956a9202 RW |
289 | } |
290 | } else { | |
7506dc79 | 291 | pci_err(dev, "enable msix get err %x\n", err); |
956a9202 | 292 | } |
1d461052 | 293 | return err; |
956a9202 RW |
294 | } |
295 | ||
296 | static void pci_frontend_disable_msix(struct pci_dev *dev) | |
297 | { | |
298 | int err; | |
299 | struct xen_pci_op op = { | |
300 | .cmd = XEN_PCI_OP_disable_msix, | |
301 | .domain = pci_domain_nr(dev->bus), | |
302 | .bus = dev->bus->number, | |
303 | .devfn = dev->devfn, | |
304 | }; | |
305 | struct pcifront_sd *sd = dev->bus->sysdata; | |
306 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
307 | ||
308 | err = do_pci_op(pdev, &op); | |
309 | ||
310 | /* What should do for error ? */ | |
311 | if (err) | |
7506dc79 | 312 | pci_err(dev, "pci_disable_msix get err %x\n", err); |
956a9202 RW |
313 | } |
314 | ||
cc0f89c4 | 315 | static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[]) |
956a9202 RW |
316 | { |
317 | int err; | |
318 | struct xen_pci_op op = { | |
319 | .cmd = XEN_PCI_OP_enable_msi, | |
320 | .domain = pci_domain_nr(dev->bus), | |
321 | .bus = dev->bus->number, | |
322 | .devfn = dev->devfn, | |
323 | }; | |
324 | struct pcifront_sd *sd = dev->bus->sysdata; | |
325 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
326 | ||
327 | err = do_pci_op(pdev, &op); | |
328 | if (likely(!err)) { | |
cc0f89c4 | 329 | vector[0] = op.value; |
1d461052 | 330 | if (op.value <= 0) { |
7506dc79 | 331 | pci_warn(dev, "MSI entry is invalid: %d!\n", |
1d461052 KRW |
332 | op.value); |
333 | err = -EINVAL; | |
cc0f89c4 | 334 | vector[0] = -1; |
1d461052 | 335 | } |
956a9202 | 336 | } else { |
7506dc79 | 337 | pci_err(dev, "pci frontend enable msi failed for dev " |
956a9202 RW |
338 | "%x:%x\n", op.bus, op.devfn); |
339 | err = -EINVAL; | |
340 | } | |
341 | return err; | |
342 | } | |
343 | ||
344 | static void pci_frontend_disable_msi(struct pci_dev *dev) | |
345 | { | |
346 | int err; | |
347 | struct xen_pci_op op = { | |
348 | .cmd = XEN_PCI_OP_disable_msi, | |
349 | .domain = pci_domain_nr(dev->bus), | |
350 | .bus = dev->bus->number, | |
351 | .devfn = dev->devfn, | |
352 | }; | |
353 | struct pcifront_sd *sd = dev->bus->sysdata; | |
354 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
355 | ||
356 | err = do_pci_op(pdev, &op); | |
357 | if (err == XEN_PCI_ERR_dev_not_found) { | |
358 | /* XXX No response from backend, what shall we do? */ | |
34c6b710 | 359 | pr_info("get no response from backend for disable MSI\n"); |
956a9202 RW |
360 | return; |
361 | } | |
362 | if (err) | |
363 | /* how can pciback notify us fail? */ | |
34c6b710 | 364 | pr_info("get fake response from backend\n"); |
956a9202 RW |
365 | } |
366 | ||
367 | static struct xen_pci_frontend_ops pci_frontend_ops = { | |
368 | .enable_msi = pci_frontend_enable_msi, | |
369 | .disable_msi = pci_frontend_disable_msi, | |
370 | .enable_msix = pci_frontend_enable_msix, | |
371 | .disable_msix = pci_frontend_disable_msix, | |
372 | }; | |
373 | ||
374 | static void pci_frontend_registrar(int enable) | |
375 | { | |
376 | if (enable) | |
377 | xen_pci_frontend = &pci_frontend_ops; | |
378 | else | |
379 | xen_pci_frontend = NULL; | |
380 | }; | |
381 | #else | |
382 | static inline void pci_frontend_registrar(int enable) { }; | |
383 | #endif /* CONFIG_PCI_MSI */ | |
384 | ||
385 | /* Claim resources for the PCI frontend as-is, backend won't allow changes */ | |
386 | static int pcifront_claim_resource(struct pci_dev *dev, void *data) | |
387 | { | |
388 | struct pcifront_device *pdev = data; | |
389 | int i; | |
390 | struct resource *r; | |
391 | ||
09cc9006 | 392 | pci_dev_for_each_resource(dev, r, i) { |
956a9202 RW |
393 | if (!r->parent && r->start && r->flags) { |
394 | dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n", | |
395 | pci_name(dev), i); | |
396 | if (pci_claim_resource(dev, i)) { | |
917e3e65 KRW |
397 | dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! " |
398 | "Device offline. Try using e820_host=1 in the guest config.\n", | |
956a9202 RW |
399 | pci_name(dev), i); |
400 | } | |
401 | } | |
402 | } | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
15856ad5 | 407 | static int pcifront_scan_bus(struct pcifront_device *pdev, |
956a9202 RW |
408 | unsigned int domain, unsigned int bus, |
409 | struct pci_bus *b) | |
410 | { | |
411 | struct pci_dev *d; | |
412 | unsigned int devfn; | |
413 | ||
f956c1b0 SMI |
414 | /* |
415 | * Scan the bus for functions and add. | |
956a9202 RW |
416 | * We omit handling of PCI bridge attachment because pciback prevents |
417 | * bridges from being exported. | |
418 | */ | |
419 | for (devfn = 0; devfn < 0x100; devfn++) { | |
420 | d = pci_get_slot(b, devfn); | |
421 | if (d) { | |
422 | /* Device is already known. */ | |
423 | pci_dev_put(d); | |
424 | continue; | |
425 | } | |
426 | ||
427 | d = pci_scan_single_device(b, devfn); | |
428 | if (d) | |
429 | dev_info(&pdev->xdev->dev, "New device on " | |
e4de866a | 430 | "%04x:%02x:%02x.%d found.\n", domain, bus, |
956a9202 RW |
431 | PCI_SLOT(devfn), PCI_FUNC(devfn)); |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
15856ad5 | 437 | static int pcifront_scan_root(struct pcifront_device *pdev, |
956a9202 RW |
438 | unsigned int domain, unsigned int bus) |
439 | { | |
440 | struct pci_bus *b; | |
515d425b | 441 | LIST_HEAD(resources); |
956a9202 RW |
442 | struct pcifront_sd *sd = NULL; |
443 | struct pci_bus_entry *bus_entry = NULL; | |
444 | int err = 0; | |
515d425b AB |
445 | static struct resource busn_res = { |
446 | .start = 0, | |
447 | .end = 255, | |
448 | .flags = IORESOURCE_BUS, | |
449 | }; | |
956a9202 RW |
450 | |
451 | #ifndef CONFIG_PCI_DOMAINS | |
452 | if (domain != 0) { | |
453 | dev_err(&pdev->xdev->dev, | |
454 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
455 | dev_err(&pdev->xdev->dev, | |
456 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
457 | err = -EINVAL; | |
458 | goto err_out; | |
459 | } | |
460 | #endif | |
461 | ||
462 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", | |
463 | domain, bus); | |
464 | ||
4d8c8bd6 KRW |
465 | bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL); |
466 | sd = kzalloc(sizeof(*sd), GFP_KERNEL); | |
956a9202 RW |
467 | if (!bus_entry || !sd) { |
468 | err = -ENOMEM; | |
469 | goto err_out; | |
470 | } | |
515d425b AB |
471 | pci_add_resource(&resources, &ioport_resource); |
472 | pci_add_resource(&resources, &iomem_resource); | |
473 | pci_add_resource(&resources, &busn_res); | |
956a9202 RW |
474 | pcifront_init_sd(sd, domain, bus, pdev); |
475 | ||
a83919e0 RW |
476 | pci_lock_rescan_remove(); |
477 | ||
515d425b AB |
478 | b = pci_scan_root_bus(&pdev->xdev->dev, bus, |
479 | &pcifront_bus_ops, sd, &resources); | |
956a9202 RW |
480 | if (!b) { |
481 | dev_err(&pdev->xdev->dev, | |
482 | "Error creating PCI Frontend Bus!\n"); | |
483 | err = -ENOMEM; | |
a83919e0 | 484 | pci_unlock_rescan_remove(); |
515d425b | 485 | pci_free_resource_list(&resources); |
956a9202 RW |
486 | goto err_out; |
487 | } | |
488 | ||
489 | bus_entry->bus = b; | |
490 | ||
491 | list_add(&bus_entry->list, &pdev->root_buses); | |
492 | ||
f956c1b0 SMI |
493 | /* |
494 | * pci_scan_root_bus skips devices which do not have a | |
495 | * devfn==0. The pcifront_scan_bus enumerates all devfn. | |
496 | */ | |
956a9202 RW |
497 | err = pcifront_scan_bus(pdev, domain, bus, b); |
498 | ||
499 | /* Claim resources before going "live" with our devices */ | |
500 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
501 | ||
502 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
503 | pci_bus_add_devices(b); | |
504 | ||
a83919e0 | 505 | pci_unlock_rescan_remove(); |
956a9202 RW |
506 | return err; |
507 | ||
508 | err_out: | |
509 | kfree(bus_entry); | |
510 | kfree(sd); | |
511 | ||
512 | return err; | |
513 | } | |
514 | ||
15856ad5 | 515 | static int pcifront_rescan_root(struct pcifront_device *pdev, |
956a9202 RW |
516 | unsigned int domain, unsigned int bus) |
517 | { | |
518 | int err; | |
519 | struct pci_bus *b; | |
520 | ||
956a9202 RW |
521 | b = pci_find_bus(domain, bus); |
522 | if (!b) | |
523 | /* If the bus is unknown, create it. */ | |
524 | return pcifront_scan_root(pdev, domain, bus); | |
525 | ||
2849752f JG |
526 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", |
527 | domain, bus); | |
528 | ||
956a9202 RW |
529 | err = pcifront_scan_bus(pdev, domain, bus, b); |
530 | ||
531 | /* Claim resources before going "live" with our devices */ | |
532 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
533 | ||
534 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
535 | pci_bus_add_devices(b); | |
536 | ||
537 | return err; | |
538 | } | |
539 | ||
540 | static void free_root_bus_devs(struct pci_bus *bus) | |
541 | { | |
542 | struct pci_dev *dev; | |
543 | ||
544 | while (!list_empty(&bus->devices)) { | |
545 | dev = container_of(bus->devices.next, struct pci_dev, | |
546 | bus_list); | |
7506dc79 | 547 | pci_dbg(dev, "removing device\n"); |
210647af | 548 | pci_stop_and_remove_bus_device(dev); |
956a9202 RW |
549 | } |
550 | } | |
551 | ||
552 | static void pcifront_free_roots(struct pcifront_device *pdev) | |
553 | { | |
554 | struct pci_bus_entry *bus_entry, *t; | |
555 | ||
556 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); | |
557 | ||
a83919e0 | 558 | pci_lock_rescan_remove(); |
956a9202 RW |
559 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { |
560 | list_del(&bus_entry->list); | |
561 | ||
562 | free_root_bus_devs(bus_entry->bus); | |
563 | ||
564 | kfree(bus_entry->bus->sysdata); | |
565 | ||
566 | device_unregister(bus_entry->bus->bridge); | |
567 | pci_remove_bus(bus_entry->bus); | |
568 | ||
569 | kfree(bus_entry); | |
570 | } | |
a83919e0 | 571 | pci_unlock_rescan_remove(); |
956a9202 RW |
572 | } |
573 | ||
574 | static pci_ers_result_t pcifront_common_process(int cmd, | |
575 | struct pcifront_device *pdev, | |
576 | pci_channel_state_t state) | |
577 | { | |
956a9202 RW |
578 | struct pci_driver *pdrv; |
579 | int bus = pdev->sh_info->aer_op.bus; | |
580 | int devfn = pdev->sh_info->aer_op.devfn; | |
dd34bb40 | 581 | int domain = pdev->sh_info->aer_op.domain; |
956a9202 | 582 | struct pci_dev *pcidev; |
956a9202 RW |
583 | |
584 | dev_dbg(&pdev->xdev->dev, | |
585 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", | |
586 | cmd, bus, devfn); | |
956a9202 | 587 | |
dd34bb40 | 588 | pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn); |
43e85554 | 589 | if (!pcidev || !pcidev->dev.driver) { |
2a63dd72 | 590 | dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); |
ff0387c3 | 591 | pci_dev_put(pcidev); |
34ab316d | 592 | return PCI_ERS_RESULT_NONE; |
956a9202 | 593 | } |
43e85554 | 594 | pdrv = to_pci_driver(pcidev->dev.driver); |
956a9202 | 595 | |
34ab316d UKK |
596 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { |
597 | pci_dbg(pcidev, "trying to call AER service\n"); | |
598 | switch (cmd) { | |
599 | case XEN_PCI_OP_aer_detected: | |
600 | return pdrv->err_handler->error_detected(pcidev, state); | |
601 | case XEN_PCI_OP_aer_mmio: | |
602 | return pdrv->err_handler->mmio_enabled(pcidev); | |
603 | case XEN_PCI_OP_aer_slotreset: | |
604 | return pdrv->err_handler->slot_reset(pcidev); | |
605 | case XEN_PCI_OP_aer_resume: | |
606 | pdrv->err_handler->resume(pcidev); | |
607 | return PCI_ERS_RESULT_NONE; | |
608 | default: | |
609 | dev_err(&pdev->xdev->dev, | |
610 | "bad request in aer recovery operation!\n"); | |
956a9202 | 611 | } |
956a9202 | 612 | } |
956a9202 | 613 | |
34ab316d | 614 | return PCI_ERS_RESULT_NONE; |
956a9202 RW |
615 | } |
616 | ||
617 | ||
618 | static void pcifront_do_aer(struct work_struct *data) | |
619 | { | |
620 | struct pcifront_device *pdev = | |
621 | container_of(data, struct pcifront_device, op_work); | |
622 | int cmd = pdev->sh_info->aer_op.cmd; | |
623 | pci_channel_state_t state = | |
624 | (pci_channel_state_t)pdev->sh_info->aer_op.err; | |
625 | ||
f956c1b0 SMI |
626 | /* |
627 | * If a pci_conf op is in progress, we have to wait until it is done | |
628 | * before service aer op | |
629 | */ | |
956a9202 RW |
630 | dev_dbg(&pdev->xdev->dev, |
631 | "pcifront service aer bus %x devfn %x\n", | |
632 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); | |
633 | ||
634 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); | |
635 | ||
636 | /* Post the operation to the guest. */ | |
637 | wmb(); | |
638 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); | |
639 | notify_remote_via_evtchn(pdev->evtchn); | |
640 | ||
641 | /*in case of we lost an aer request in four lines time_window*/ | |
4e857c58 | 642 | smp_mb__before_atomic(); |
956a9202 | 643 | clear_bit(_PDEVB_op_active, &pdev->flags); |
4e857c58 | 644 | smp_mb__after_atomic(); |
956a9202 RW |
645 | |
646 | schedule_pcifront_aer_op(pdev); | |
647 | ||
648 | } | |
649 | ||
650 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) | |
651 | { | |
652 | struct pcifront_device *pdev = dev; | |
f956c1b0 | 653 | |
956a9202 RW |
654 | schedule_pcifront_aer_op(pdev); |
655 | return IRQ_HANDLED; | |
656 | } | |
3d925320 | 657 | static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) |
956a9202 RW |
658 | { |
659 | int err = 0; | |
660 | ||
661 | spin_lock(&pcifront_dev_lock); | |
662 | ||
663 | if (!pcifront_dev) { | |
664 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); | |
665 | pcifront_dev = pdev; | |
098b1aea | 666 | } else |
956a9202 | 667 | err = -EEXIST; |
098b1aea | 668 | |
956a9202 RW |
669 | spin_unlock(&pcifront_dev_lock); |
670 | ||
671 | return err; | |
672 | } | |
673 | ||
674 | static void pcifront_disconnect(struct pcifront_device *pdev) | |
675 | { | |
676 | spin_lock(&pcifront_dev_lock); | |
677 | ||
678 | if (pdev == pcifront_dev) { | |
679 | dev_info(&pdev->xdev->dev, | |
680 | "Disconnecting PCI Frontend Buses\n"); | |
681 | pcifront_dev = NULL; | |
682 | } | |
683 | ||
684 | spin_unlock(&pcifront_dev_lock); | |
685 | } | |
686 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) | |
687 | { | |
688 | struct pcifront_device *pdev; | |
689 | ||
690 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); | |
691 | if (pdev == NULL) | |
692 | goto out; | |
693 | ||
0e6b139d JG |
694 | if (xenbus_setup_ring(xdev, GFP_KERNEL, (void **)&pdev->sh_info, 1, |
695 | &pdev->gnt_ref)) { | |
956a9202 RW |
696 | kfree(pdev); |
697 | pdev = NULL; | |
698 | goto out; | |
699 | } | |
700 | pdev->sh_info->flags = 0; | |
701 | ||
702 | /*Flag for registering PV AER handler*/ | |
703 | set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags); | |
704 | ||
705 | dev_set_drvdata(&xdev->dev, pdev); | |
706 | pdev->xdev = xdev; | |
707 | ||
708 | INIT_LIST_HEAD(&pdev->root_buses); | |
709 | ||
710 | spin_lock_init(&pdev->sh_info_lock); | |
711 | ||
712 | pdev->evtchn = INVALID_EVTCHN; | |
956a9202 RW |
713 | pdev->irq = -1; |
714 | ||
715 | INIT_WORK(&pdev->op_work, pcifront_do_aer); | |
716 | ||
717 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", | |
718 | pdev, pdev->sh_info); | |
719 | out: | |
720 | return pdev; | |
721 | } | |
722 | ||
723 | static void free_pdev(struct pcifront_device *pdev) | |
724 | { | |
725 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); | |
726 | ||
727 | pcifront_free_roots(pdev); | |
728 | ||
db2e2e6e | 729 | cancel_work_sync(&pdev->op_work); |
956a9202 RW |
730 | |
731 | if (pdev->irq >= 0) | |
732 | unbind_from_irqhandler(pdev->irq, pdev); | |
733 | ||
734 | if (pdev->evtchn != INVALID_EVTCHN) | |
735 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); | |
736 | ||
0e6b139d | 737 | xenbus_teardown_ring((void **)&pdev->sh_info, 1, &pdev->gnt_ref); |
956a9202 RW |
738 | |
739 | dev_set_drvdata(&pdev->xdev->dev, NULL); | |
740 | ||
741 | kfree(pdev); | |
742 | } | |
743 | ||
744 | static int pcifront_publish_info(struct pcifront_device *pdev) | |
745 | { | |
746 | int err = 0; | |
747 | struct xenbus_transaction trans; | |
956a9202 RW |
748 | |
749 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); | |
750 | if (err) | |
751 | goto out; | |
752 | ||
753 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, | |
754 | 0, "pcifront", pdev); | |
755 | ||
756 | if (err < 0) | |
757 | return err; | |
758 | ||
759 | pdev->irq = err; | |
760 | ||
761 | do_publish: | |
762 | err = xenbus_transaction_start(&trans); | |
763 | if (err) { | |
764 | xenbus_dev_fatal(pdev->xdev, err, | |
765 | "Error writing configuration for backend " | |
766 | "(start transaction)"); | |
767 | goto out; | |
768 | } | |
769 | ||
770 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
771 | "pci-op-ref", "%u", pdev->gnt_ref); | |
772 | if (!err) | |
773 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
774 | "event-channel", "%u", pdev->evtchn); | |
775 | if (!err) | |
776 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
777 | "magic", XEN_PCI_MAGIC); | |
778 | ||
779 | if (err) { | |
780 | xenbus_transaction_end(trans, 1); | |
781 | xenbus_dev_fatal(pdev->xdev, err, | |
782 | "Error writing configuration for backend"); | |
783 | goto out; | |
784 | } else { | |
785 | err = xenbus_transaction_end(trans, 0); | |
786 | if (err == -EAGAIN) | |
787 | goto do_publish; | |
788 | else if (err) { | |
789 | xenbus_dev_fatal(pdev->xdev, err, | |
790 | "Error completing transaction " | |
791 | "for backend"); | |
792 | goto out; | |
793 | } | |
794 | } | |
795 | ||
796 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | |
797 | ||
798 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); | |
799 | ||
800 | out: | |
801 | return err; | |
802 | } | |
803 | ||
2849752f | 804 | static void pcifront_connect(struct pcifront_device *pdev) |
956a9202 | 805 | { |
2849752f | 806 | int err; |
956a9202 RW |
807 | int i, num_roots, len; |
808 | char str[64]; | |
809 | unsigned int domain, bus; | |
810 | ||
956a9202 RW |
811 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, |
812 | "root_num", "%d", &num_roots); | |
813 | if (err == -ENOENT) { | |
814 | xenbus_dev_error(pdev->xdev, err, | |
815 | "No PCI Roots found, trying 0000:00"); | |
2849752f | 816 | err = pcifront_rescan_root(pdev, 0, 0); |
23cf1d00 CG |
817 | if (err) { |
818 | xenbus_dev_fatal(pdev->xdev, err, | |
819 | "Error scanning PCI root 0000:00"); | |
2849752f | 820 | return; |
23cf1d00 | 821 | } |
956a9202 RW |
822 | num_roots = 0; |
823 | } else if (err != 1) { | |
2849752f | 824 | xenbus_dev_fatal(pdev->xdev, err >= 0 ? -EINVAL : err, |
956a9202 | 825 | "Error reading number of PCI roots"); |
2849752f | 826 | return; |
956a9202 RW |
827 | } |
828 | ||
829 | for (i = 0; i < num_roots; i++) { | |
830 | len = snprintf(str, sizeof(str), "root-%d", i); | |
2849752f JG |
831 | if (unlikely(len >= (sizeof(str) - 1))) |
832 | return; | |
956a9202 RW |
833 | |
834 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
835 | "%x:%x", &domain, &bus); | |
836 | if (err != 2) { | |
2849752f | 837 | xenbus_dev_fatal(pdev->xdev, err >= 0 ? -EINVAL : err, |
956a9202 | 838 | "Error reading PCI root %d", i); |
2849752f | 839 | return; |
956a9202 RW |
840 | } |
841 | ||
2849752f | 842 | err = pcifront_rescan_root(pdev, domain, bus); |
956a9202 RW |
843 | if (err) { |
844 | xenbus_dev_fatal(pdev->xdev, err, | |
845 | "Error scanning PCI root %04x:%02x", | |
846 | domain, bus); | |
2849752f | 847 | return; |
956a9202 RW |
848 | } |
849 | } | |
850 | ||
2849752f JG |
851 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); |
852 | } | |
853 | ||
854 | static void pcifront_try_connect(struct pcifront_device *pdev) | |
855 | { | |
856 | int err; | |
956a9202 | 857 | |
2849752f JG |
858 | /* Only connect once */ |
859 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
860 | XenbusStateInitialised) | |
861 | return; | |
862 | ||
863 | err = pcifront_connect_and_init_dma(pdev); | |
864 | if (err && err != -EEXIST) { | |
865 | xenbus_dev_fatal(pdev->xdev, err, | |
866 | "Error setting up PCI Frontend"); | |
867 | return; | |
868 | } | |
869 | ||
870 | pcifront_connect(pdev); | |
956a9202 RW |
871 | } |
872 | ||
873 | static int pcifront_try_disconnect(struct pcifront_device *pdev) | |
874 | { | |
875 | int err = 0; | |
876 | enum xenbus_state prev_state; | |
877 | ||
878 | ||
879 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); | |
880 | ||
881 | if (prev_state >= XenbusStateClosing) | |
882 | goto out; | |
883 | ||
884 | if (prev_state == XenbusStateConnected) { | |
885 | pcifront_free_roots(pdev); | |
886 | pcifront_disconnect(pdev); | |
887 | } | |
888 | ||
889 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); | |
890 | ||
891 | out: | |
892 | ||
893 | return err; | |
894 | } | |
895 | ||
2849752f | 896 | static void pcifront_attach_devices(struct pcifront_device *pdev) |
956a9202 | 897 | { |
2849752f | 898 | if (xenbus_read_driver_state(pdev->xdev->nodename) == |
956a9202 | 899 | XenbusStateReconfiguring) |
2849752f | 900 | pcifront_connect(pdev); |
956a9202 RW |
901 | } |
902 | ||
903 | static int pcifront_detach_devices(struct pcifront_device *pdev) | |
904 | { | |
905 | int err = 0; | |
906 | int i, num_devs; | |
728c2edf | 907 | enum xenbus_state state; |
956a9202 | 908 | unsigned int domain, bus, slot, func; |
956a9202 RW |
909 | struct pci_dev *pci_dev; |
910 | char str[64]; | |
911 | ||
728c2edf JA |
912 | state = xenbus_read_driver_state(pdev->xdev->nodename); |
913 | if (state == XenbusStateInitialised) { | |
914 | dev_dbg(&pdev->xdev->dev, "Handle skipped connect.\n"); | |
915 | /* We missed Connected and need to initialize. */ | |
916 | err = pcifront_connect_and_init_dma(pdev); | |
917 | if (err && err != -EEXIST) { | |
918 | xenbus_dev_fatal(pdev->xdev, err, | |
919 | "Error setting up PCI Frontend"); | |
920 | goto out; | |
921 | } | |
922 | ||
923 | goto out_switch_state; | |
924 | } else if (state != XenbusStateConnected) { | |
956a9202 | 925 | goto out; |
728c2edf | 926 | } |
956a9202 RW |
927 | |
928 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", | |
929 | &num_devs); | |
930 | if (err != 1) { | |
931 | if (err >= 0) | |
932 | err = -EINVAL; | |
933 | xenbus_dev_fatal(pdev->xdev, err, | |
934 | "Error reading number of PCI devices"); | |
935 | goto out; | |
936 | } | |
937 | ||
938 | /* Find devices being detached and remove them. */ | |
939 | for (i = 0; i < num_devs; i++) { | |
940 | int l, state; | |
f956c1b0 | 941 | |
956a9202 RW |
942 | l = snprintf(str, sizeof(str), "state-%d", i); |
943 | if (unlikely(l >= (sizeof(str) - 1))) { | |
944 | err = -ENOMEM; | |
945 | goto out; | |
946 | } | |
58faf07b JG |
947 | state = xenbus_read_unsigned(pdev->xdev->otherend, str, |
948 | XenbusStateUnknown); | |
956a9202 RW |
949 | |
950 | if (state != XenbusStateClosing) | |
951 | continue; | |
952 | ||
953 | /* Remove device. */ | |
954 | l = snprintf(str, sizeof(str), "vdev-%d", i); | |
955 | if (unlikely(l >= (sizeof(str) - 1))) { | |
956 | err = -ENOMEM; | |
957 | goto out; | |
958 | } | |
959 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
960 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | |
961 | if (err != 4) { | |
962 | if (err >= 0) | |
963 | err = -EINVAL; | |
964 | xenbus_dev_fatal(pdev->xdev, err, | |
965 | "Error reading PCI device %d", i); | |
966 | goto out; | |
967 | } | |
968 | ||
2ccc246d JL |
969 | pci_dev = pci_get_domain_bus_and_slot(domain, bus, |
970 | PCI_DEVFN(slot, func)); | |
956a9202 RW |
971 | if (!pci_dev) { |
972 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 973 | "Cannot get PCI device %04x:%02x:%02x.%d\n", |
956a9202 RW |
974 | domain, bus, slot, func); |
975 | continue; | |
976 | } | |
a83919e0 | 977 | pci_lock_rescan_remove(); |
210647af | 978 | pci_stop_and_remove_bus_device(pci_dev); |
956a9202 | 979 | pci_dev_put(pci_dev); |
a83919e0 | 980 | pci_unlock_rescan_remove(); |
956a9202 RW |
981 | |
982 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 983 | "PCI device %04x:%02x:%02x.%d removed.\n", |
956a9202 RW |
984 | domain, bus, slot, func); |
985 | } | |
986 | ||
728c2edf | 987 | out_switch_state: |
956a9202 RW |
988 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); |
989 | ||
990 | out: | |
991 | return err; | |
992 | } | |
993 | ||
f956c1b0 | 994 | static void pcifront_backend_changed(struct xenbus_device *xdev, |
956a9202 RW |
995 | enum xenbus_state be_state) |
996 | { | |
997 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
998 | ||
999 | switch (be_state) { | |
1000 | case XenbusStateUnknown: | |
1001 | case XenbusStateInitialising: | |
1002 | case XenbusStateInitWait: | |
1003 | case XenbusStateInitialised: | |
956a9202 RW |
1004 | break; |
1005 | ||
1006 | case XenbusStateConnected: | |
1007 | pcifront_try_connect(pdev); | |
1008 | break; | |
1009 | ||
d5af64de DV |
1010 | case XenbusStateClosed: |
1011 | if (xdev->state == XenbusStateClosed) | |
1012 | break; | |
df561f66 | 1013 | fallthrough; /* Missed the backend's CLOSING state */ |
956a9202 RW |
1014 | case XenbusStateClosing: |
1015 | dev_warn(&xdev->dev, "backend going away!\n"); | |
1016 | pcifront_try_disconnect(pdev); | |
1017 | break; | |
1018 | ||
1019 | case XenbusStateReconfiguring: | |
1020 | pcifront_detach_devices(pdev); | |
1021 | break; | |
1022 | ||
1023 | case XenbusStateReconfigured: | |
1024 | pcifront_attach_devices(pdev); | |
1025 | break; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, | |
1030 | const struct xenbus_device_id *id) | |
1031 | { | |
1032 | int err = 0; | |
1033 | struct pcifront_device *pdev = alloc_pdev(xdev); | |
1034 | ||
1035 | if (pdev == NULL) { | |
1036 | err = -ENOMEM; | |
1037 | xenbus_dev_fatal(xdev, err, | |
1038 | "Error allocating pcifront_device struct"); | |
1039 | goto out; | |
1040 | } | |
1041 | ||
1042 | err = pcifront_publish_info(pdev); | |
1043 | if (err) | |
1044 | free_pdev(pdev); | |
1045 | ||
1046 | out: | |
1047 | return err; | |
1048 | } | |
1049 | ||
7cffcade | 1050 | static void pcifront_xenbus_remove(struct xenbus_device *xdev) |
956a9202 RW |
1051 | { |
1052 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
f956c1b0 | 1053 | |
956a9202 RW |
1054 | if (pdev) |
1055 | free_pdev(pdev); | |
956a9202 RW |
1056 | } |
1057 | ||
1058 | static const struct xenbus_device_id xenpci_ids[] = { | |
1059 | {"pci"}, | |
1060 | {""}, | |
1061 | }; | |
1062 | ||
95afae48 DV |
1063 | static struct xenbus_driver xenpci_driver = { |
1064 | .name = "pcifront", | |
1065 | .ids = xenpci_ids, | |
956a9202 RW |
1066 | .probe = pcifront_xenbus_probe, |
1067 | .remove = pcifront_xenbus_remove, | |
1068 | .otherend_changed = pcifront_backend_changed, | |
95afae48 | 1069 | }; |
956a9202 RW |
1070 | |
1071 | static int __init pcifront_init(void) | |
1072 | { | |
1073 | if (!xen_pv_domain() || xen_initial_domain()) | |
1074 | return -ENODEV; | |
1075 | ||
51c71a3b KRW |
1076 | if (!xen_has_pv_devices()) |
1077 | return -ENODEV; | |
1078 | ||
956a9202 RW |
1079 | pci_frontend_registrar(1 /* enable */); |
1080 | ||
73db144b | 1081 | return xenbus_register_frontend(&xenpci_driver); |
956a9202 RW |
1082 | } |
1083 | ||
1084 | static void __exit pcifront_cleanup(void) | |
1085 | { | |
73db144b | 1086 | xenbus_unregister_driver(&xenpci_driver); |
956a9202 RW |
1087 | pci_frontend_registrar(0 /* disable */); |
1088 | } | |
1089 | module_init(pcifront_init); | |
1090 | module_exit(pcifront_cleanup); | |
1091 | ||
1092 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); | |
1093 | MODULE_LICENSE("GPL"); | |
1094 | MODULE_ALIAS("xen:pci"); |