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> |
0a0f0d8b | 25 | #include <linux/swiotlb.h> |
51c71a3b | 26 | #include <xen/platform_pci.h> |
956a9202 | 27 | |
3d925320 | 28 | #include <asm/xen/swiotlb-xen.h> |
bce21a2b | 29 | |
956a9202 RW |
30 | #define INVALID_EVTCHN (-1) |
31 | ||
32 | struct pci_bus_entry { | |
33 | struct list_head list; | |
34 | struct pci_bus *bus; | |
35 | }; | |
36 | ||
37 | #define _PDEVB_op_active (0) | |
38 | #define PDEVB_op_active (1 << (_PDEVB_op_active)) | |
39 | ||
40 | struct pcifront_device { | |
41 | struct xenbus_device *xdev; | |
42 | struct list_head root_buses; | |
43 | ||
44 | int evtchn; | |
bce21a2b | 45 | grant_ref_t gnt_ref; |
956a9202 RW |
46 | |
47 | int irq; | |
48 | ||
49 | /* Lock this when doing any operations in sh_info */ | |
50 | spinlock_t sh_info_lock; | |
51 | struct xen_pci_sharedinfo *sh_info; | |
52 | struct work_struct op_work; | |
53 | unsigned long flags; | |
54 | ||
55 | }; | |
56 | ||
57 | struct pcifront_sd { | |
4d8c8bd6 | 58 | struct pci_sysdata sd; |
956a9202 RW |
59 | struct pcifront_device *pdev; |
60 | }; | |
61 | ||
62 | static inline struct pcifront_device * | |
63 | pcifront_get_pdev(struct pcifront_sd *sd) | |
64 | { | |
65 | return sd->pdev; | |
66 | } | |
67 | ||
68 | static inline void pcifront_init_sd(struct pcifront_sd *sd, | |
69 | unsigned int domain, unsigned int bus, | |
70 | struct pcifront_device *pdev) | |
71 | { | |
4d8c8bd6 KRW |
72 | /* Because we do not expose that information via XenBus. */ |
73 | sd->sd.node = first_online_node; | |
74 | sd->sd.domain = domain; | |
956a9202 RW |
75 | sd->pdev = pdev; |
76 | } | |
77 | ||
78 | static DEFINE_SPINLOCK(pcifront_dev_lock); | |
79 | static struct pcifront_device *pcifront_dev; | |
80 | ||
956a9202 RW |
81 | static int errno_to_pcibios_err(int errno) |
82 | { | |
83 | switch (errno) { | |
84 | case XEN_PCI_ERR_success: | |
85 | return PCIBIOS_SUCCESSFUL; | |
86 | ||
87 | case XEN_PCI_ERR_dev_not_found: | |
88 | return PCIBIOS_DEVICE_NOT_FOUND; | |
89 | ||
90 | case XEN_PCI_ERR_invalid_offset: | |
91 | case XEN_PCI_ERR_op_failed: | |
92 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
93 | ||
94 | case XEN_PCI_ERR_not_implemented: | |
95 | return PCIBIOS_FUNC_NOT_SUPPORTED; | |
96 | ||
97 | case XEN_PCI_ERR_access_denied: | |
98 | return PCIBIOS_SET_FAILED; | |
99 | } | |
100 | return errno; | |
101 | } | |
102 | ||
103 | static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev) | |
104 | { | |
105 | if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags) | |
106 | && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) { | |
107 | dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n"); | |
108 | schedule_work(&pdev->op_work); | |
109 | } | |
110 | } | |
111 | ||
112 | static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) | |
113 | { | |
114 | int err = 0; | |
115 | struct xen_pci_op *active_op = &pdev->sh_info->op; | |
116 | unsigned long irq_flags; | |
117 | evtchn_port_t port = pdev->evtchn; | |
f956c1b0 | 118 | unsigned int irq = pdev->irq; |
956a9202 | 119 | s64 ns, ns_timeout; |
956a9202 RW |
120 | |
121 | spin_lock_irqsave(&pdev->sh_info_lock, irq_flags); | |
122 | ||
123 | memcpy(active_op, op, sizeof(struct xen_pci_op)); | |
124 | ||
125 | /* Go */ | |
126 | wmb(); | |
127 | set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags); | |
128 | notify_remote_via_evtchn(port); | |
129 | ||
130 | /* | |
131 | * We set a poll timeout of 3 seconds but give up on return after | |
132 | * 2 seconds. It is better to time out too late rather than too early | |
133 | * (in the latter case we end up continually re-executing poll() with a | |
134 | * timeout in the past). 1s difference gives plenty of slack for error. | |
135 | */ | |
e1d5bbcd | 136 | ns_timeout = ktime_get_ns() + 2 * (s64)NSEC_PER_SEC; |
956a9202 RW |
137 | |
138 | xen_clear_irq_pending(irq); | |
139 | ||
140 | while (test_bit(_XEN_PCIF_active, | |
141 | (unsigned long *)&pdev->sh_info->flags)) { | |
142 | xen_poll_irq_timeout(irq, jiffies + 3*HZ); | |
143 | xen_clear_irq_pending(irq); | |
e1d5bbcd | 144 | ns = ktime_get_ns(); |
956a9202 RW |
145 | if (ns > ns_timeout) { |
146 | dev_err(&pdev->xdev->dev, | |
147 | "pciback not responding!!!\n"); | |
148 | clear_bit(_XEN_PCIF_active, | |
149 | (unsigned long *)&pdev->sh_info->flags); | |
150 | err = XEN_PCI_ERR_dev_not_found; | |
151 | goto out; | |
152 | } | |
153 | } | |
154 | ||
155 | /* | |
f956c1b0 SMI |
156 | * We might lose backend service request since we |
157 | * reuse same evtchn with pci_conf backend response. So re-schedule | |
158 | * aer pcifront service. | |
159 | */ | |
956a9202 RW |
160 | if (test_bit(_XEN_PCIB_active, |
161 | (unsigned long *)&pdev->sh_info->flags)) { | |
162 | dev_err(&pdev->xdev->dev, | |
163 | "schedule aer pcifront service\n"); | |
164 | schedule_pcifront_aer_op(pdev); | |
165 | } | |
166 | ||
167 | memcpy(op, active_op, sizeof(struct xen_pci_op)); | |
168 | ||
169 | err = op->err; | |
170 | out: | |
171 | spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags); | |
172 | return err; | |
173 | } | |
174 | ||
175 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
176 | static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn, | |
177 | int where, int size, u32 *val) | |
178 | { | |
179 | int err = 0; | |
180 | struct xen_pci_op op = { | |
181 | .cmd = XEN_PCI_OP_conf_read, | |
182 | .domain = pci_domain_nr(bus), | |
183 | .bus = bus->number, | |
184 | .devfn = devfn, | |
185 | .offset = where, | |
186 | .size = size, | |
187 | }; | |
188 | struct pcifront_sd *sd = bus->sysdata; | |
189 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
190 | ||
4969a3a2 BO |
191 | dev_dbg(&pdev->xdev->dev, |
192 | "read dev=%04x:%02x:%02x.%d - offset %x size %d\n", | |
193 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), | |
194 | PCI_FUNC(devfn), where, size); | |
956a9202 RW |
195 | |
196 | err = do_pci_op(pdev, &op); | |
197 | ||
198 | if (likely(!err)) { | |
4969a3a2 BO |
199 | dev_dbg(&pdev->xdev->dev, "read got back value %x\n", |
200 | op.value); | |
956a9202 RW |
201 | |
202 | *val = op.value; | |
203 | } else if (err == -ENODEV) { | |
204 | /* No device here, pretend that it just returned 0 */ | |
205 | err = 0; | |
206 | *val = 0; | |
207 | } | |
208 | ||
209 | return errno_to_pcibios_err(err); | |
210 | } | |
211 | ||
212 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
213 | static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn, | |
214 | int where, int size, u32 val) | |
215 | { | |
216 | struct xen_pci_op op = { | |
217 | .cmd = XEN_PCI_OP_conf_write, | |
218 | .domain = pci_domain_nr(bus), | |
219 | .bus = bus->number, | |
220 | .devfn = devfn, | |
221 | .offset = where, | |
222 | .size = size, | |
223 | .value = val, | |
224 | }; | |
225 | struct pcifront_sd *sd = bus->sysdata; | |
226 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
227 | ||
4969a3a2 BO |
228 | dev_dbg(&pdev->xdev->dev, |
229 | "write dev=%04x:%02x:%02x.%d - offset %x size %d val %x\n", | |
230 | pci_domain_nr(bus), bus->number, | |
231 | PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); | |
956a9202 RW |
232 | |
233 | return errno_to_pcibios_err(do_pci_op(pdev, &op)); | |
234 | } | |
235 | ||
b8b0f559 | 236 | static struct pci_ops pcifront_bus_ops = { |
956a9202 RW |
237 | .read = pcifront_bus_read, |
238 | .write = pcifront_bus_write, | |
239 | }; | |
240 | ||
241 | #ifdef CONFIG_PCI_MSI | |
242 | static int pci_frontend_enable_msix(struct pci_dev *dev, | |
cc0f89c4 | 243 | int vector[], int nvec) |
956a9202 RW |
244 | { |
245 | int err; | |
246 | int i; | |
247 | struct xen_pci_op op = { | |
248 | .cmd = XEN_PCI_OP_enable_msix, | |
249 | .domain = pci_domain_nr(dev->bus), | |
250 | .bus = dev->bus->number, | |
251 | .devfn = dev->devfn, | |
252 | .value = nvec, | |
253 | }; | |
254 | struct pcifront_sd *sd = dev->bus->sysdata; | |
255 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
256 | struct msi_desc *entry; | |
257 | ||
258 | if (nvec > SH_INFO_MAX_VEC) { | |
7506dc79 FL |
259 | pci_err(dev, "too many vectors (0x%x) for PCI frontend:" |
260 | " Increase SH_INFO_MAX_VEC\n", nvec); | |
956a9202 RW |
261 | return -EINVAL; |
262 | } | |
263 | ||
264 | i = 0; | |
3d31bbd3 | 265 | msi_for_each_desc(entry, &dev->dev, MSI_DESC_NOTASSOCIATED) { |
173ffad7 | 266 | op.msix_entries[i].entry = entry->msi_index; |
956a9202 RW |
267 | /* Vector is useless at this point. */ |
268 | op.msix_entries[i].vector = -1; | |
269 | i++; | |
270 | } | |
271 | ||
272 | err = do_pci_op(pdev, &op); | |
273 | ||
274 | if (likely(!err)) { | |
275 | if (likely(!op.value)) { | |
276 | /* we get the result */ | |
1d461052 KRW |
277 | for (i = 0; i < nvec; i++) { |
278 | if (op.msix_entries[i].vector <= 0) { | |
7506dc79 | 279 | pci_warn(dev, "MSI-X entry %d is invalid: %d!\n", |
1d461052 KRW |
280 | i, op.msix_entries[i].vector); |
281 | err = -EINVAL; | |
cc0f89c4 | 282 | vector[i] = -1; |
1d461052 KRW |
283 | continue; |
284 | } | |
cc0f89c4 | 285 | vector[i] = op.msix_entries[i].vector; |
1d461052 | 286 | } |
956a9202 | 287 | } else { |
34c6b710 | 288 | pr_info("enable msix get value %x\n", op.value); |
f09d8432 | 289 | err = op.value; |
956a9202 RW |
290 | } |
291 | } else { | |
7506dc79 | 292 | pci_err(dev, "enable msix get err %x\n", err); |
956a9202 | 293 | } |
1d461052 | 294 | return err; |
956a9202 RW |
295 | } |
296 | ||
297 | static void pci_frontend_disable_msix(struct pci_dev *dev) | |
298 | { | |
299 | int err; | |
300 | struct xen_pci_op op = { | |
301 | .cmd = XEN_PCI_OP_disable_msix, | |
302 | .domain = pci_domain_nr(dev->bus), | |
303 | .bus = dev->bus->number, | |
304 | .devfn = dev->devfn, | |
305 | }; | |
306 | struct pcifront_sd *sd = dev->bus->sysdata; | |
307 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
308 | ||
309 | err = do_pci_op(pdev, &op); | |
310 | ||
311 | /* What should do for error ? */ | |
312 | if (err) | |
7506dc79 | 313 | pci_err(dev, "pci_disable_msix get err %x\n", err); |
956a9202 RW |
314 | } |
315 | ||
cc0f89c4 | 316 | static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[]) |
956a9202 RW |
317 | { |
318 | int err; | |
319 | struct xen_pci_op op = { | |
320 | .cmd = XEN_PCI_OP_enable_msi, | |
321 | .domain = pci_domain_nr(dev->bus), | |
322 | .bus = dev->bus->number, | |
323 | .devfn = dev->devfn, | |
324 | }; | |
325 | struct pcifront_sd *sd = dev->bus->sysdata; | |
326 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
327 | ||
328 | err = do_pci_op(pdev, &op); | |
329 | if (likely(!err)) { | |
cc0f89c4 | 330 | vector[0] = op.value; |
1d461052 | 331 | if (op.value <= 0) { |
7506dc79 | 332 | pci_warn(dev, "MSI entry is invalid: %d!\n", |
1d461052 KRW |
333 | op.value); |
334 | err = -EINVAL; | |
cc0f89c4 | 335 | vector[0] = -1; |
1d461052 | 336 | } |
956a9202 | 337 | } else { |
7506dc79 | 338 | pci_err(dev, "pci frontend enable msi failed for dev " |
956a9202 RW |
339 | "%x:%x\n", op.bus, op.devfn); |
340 | err = -EINVAL; | |
341 | } | |
342 | return err; | |
343 | } | |
344 | ||
345 | static void pci_frontend_disable_msi(struct pci_dev *dev) | |
346 | { | |
347 | int err; | |
348 | struct xen_pci_op op = { | |
349 | .cmd = XEN_PCI_OP_disable_msi, | |
350 | .domain = pci_domain_nr(dev->bus), | |
351 | .bus = dev->bus->number, | |
352 | .devfn = dev->devfn, | |
353 | }; | |
354 | struct pcifront_sd *sd = dev->bus->sysdata; | |
355 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
356 | ||
357 | err = do_pci_op(pdev, &op); | |
358 | if (err == XEN_PCI_ERR_dev_not_found) { | |
359 | /* XXX No response from backend, what shall we do? */ | |
34c6b710 | 360 | pr_info("get no response from backend for disable MSI\n"); |
956a9202 RW |
361 | return; |
362 | } | |
363 | if (err) | |
364 | /* how can pciback notify us fail? */ | |
34c6b710 | 365 | pr_info("get fake response from backend\n"); |
956a9202 RW |
366 | } |
367 | ||
368 | static struct xen_pci_frontend_ops pci_frontend_ops = { | |
369 | .enable_msi = pci_frontend_enable_msi, | |
370 | .disable_msi = pci_frontend_disable_msi, | |
371 | .enable_msix = pci_frontend_enable_msix, | |
372 | .disable_msix = pci_frontend_disable_msix, | |
373 | }; | |
374 | ||
375 | static void pci_frontend_registrar(int enable) | |
376 | { | |
377 | if (enable) | |
378 | xen_pci_frontend = &pci_frontend_ops; | |
379 | else | |
380 | xen_pci_frontend = NULL; | |
381 | }; | |
382 | #else | |
383 | static inline void pci_frontend_registrar(int enable) { }; | |
384 | #endif /* CONFIG_PCI_MSI */ | |
385 | ||
386 | /* Claim resources for the PCI frontend as-is, backend won't allow changes */ | |
387 | static int pcifront_claim_resource(struct pci_dev *dev, void *data) | |
388 | { | |
389 | struct pcifront_device *pdev = data; | |
390 | int i; | |
391 | struct resource *r; | |
392 | ||
09cc9006 | 393 | pci_dev_for_each_resource(dev, r, i) { |
956a9202 RW |
394 | if (!r->parent && r->start && r->flags) { |
395 | dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n", | |
396 | pci_name(dev), i); | |
397 | if (pci_claim_resource(dev, i)) { | |
917e3e65 KRW |
398 | dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! " |
399 | "Device offline. Try using e820_host=1 in the guest config.\n", | |
956a9202 RW |
400 | pci_name(dev), i); |
401 | } | |
402 | } | |
403 | } | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
15856ad5 | 408 | static int pcifront_scan_bus(struct pcifront_device *pdev, |
956a9202 RW |
409 | unsigned int domain, unsigned int bus, |
410 | struct pci_bus *b) | |
411 | { | |
412 | struct pci_dev *d; | |
413 | unsigned int devfn; | |
414 | ||
f956c1b0 SMI |
415 | /* |
416 | * Scan the bus for functions and add. | |
956a9202 RW |
417 | * We omit handling of PCI bridge attachment because pciback prevents |
418 | * bridges from being exported. | |
419 | */ | |
420 | for (devfn = 0; devfn < 0x100; devfn++) { | |
421 | d = pci_get_slot(b, devfn); | |
422 | if (d) { | |
423 | /* Device is already known. */ | |
424 | pci_dev_put(d); | |
425 | continue; | |
426 | } | |
427 | ||
428 | d = pci_scan_single_device(b, devfn); | |
429 | if (d) | |
430 | dev_info(&pdev->xdev->dev, "New device on " | |
e4de866a | 431 | "%04x:%02x:%02x.%d found.\n", domain, bus, |
956a9202 RW |
432 | PCI_SLOT(devfn), PCI_FUNC(devfn)); |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
15856ad5 | 438 | static int pcifront_scan_root(struct pcifront_device *pdev, |
956a9202 RW |
439 | unsigned int domain, unsigned int bus) |
440 | { | |
441 | struct pci_bus *b; | |
515d425b | 442 | LIST_HEAD(resources); |
956a9202 RW |
443 | struct pcifront_sd *sd = NULL; |
444 | struct pci_bus_entry *bus_entry = NULL; | |
445 | int err = 0; | |
515d425b AB |
446 | static struct resource busn_res = { |
447 | .start = 0, | |
448 | .end = 255, | |
449 | .flags = IORESOURCE_BUS, | |
450 | }; | |
956a9202 RW |
451 | |
452 | #ifndef CONFIG_PCI_DOMAINS | |
453 | if (domain != 0) { | |
454 | dev_err(&pdev->xdev->dev, | |
455 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
456 | dev_err(&pdev->xdev->dev, | |
457 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
458 | err = -EINVAL; | |
459 | goto err_out; | |
460 | } | |
461 | #endif | |
462 | ||
463 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", | |
464 | domain, bus); | |
465 | ||
4d8c8bd6 KRW |
466 | bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL); |
467 | sd = kzalloc(sizeof(*sd), GFP_KERNEL); | |
956a9202 RW |
468 | if (!bus_entry || !sd) { |
469 | err = -ENOMEM; | |
470 | goto err_out; | |
471 | } | |
515d425b AB |
472 | pci_add_resource(&resources, &ioport_resource); |
473 | pci_add_resource(&resources, &iomem_resource); | |
474 | pci_add_resource(&resources, &busn_res); | |
956a9202 RW |
475 | pcifront_init_sd(sd, domain, bus, pdev); |
476 | ||
a83919e0 RW |
477 | pci_lock_rescan_remove(); |
478 | ||
515d425b AB |
479 | b = pci_scan_root_bus(&pdev->xdev->dev, bus, |
480 | &pcifront_bus_ops, sd, &resources); | |
956a9202 RW |
481 | if (!b) { |
482 | dev_err(&pdev->xdev->dev, | |
483 | "Error creating PCI Frontend Bus!\n"); | |
484 | err = -ENOMEM; | |
a83919e0 | 485 | pci_unlock_rescan_remove(); |
515d425b | 486 | pci_free_resource_list(&resources); |
956a9202 RW |
487 | goto err_out; |
488 | } | |
489 | ||
490 | bus_entry->bus = b; | |
491 | ||
492 | list_add(&bus_entry->list, &pdev->root_buses); | |
493 | ||
f956c1b0 SMI |
494 | /* |
495 | * pci_scan_root_bus skips devices which do not have a | |
496 | * devfn==0. The pcifront_scan_bus enumerates all devfn. | |
497 | */ | |
956a9202 RW |
498 | err = pcifront_scan_bus(pdev, domain, bus, b); |
499 | ||
500 | /* Claim resources before going "live" with our devices */ | |
501 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
502 | ||
503 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
504 | pci_bus_add_devices(b); | |
505 | ||
a83919e0 | 506 | pci_unlock_rescan_remove(); |
956a9202 RW |
507 | return err; |
508 | ||
509 | err_out: | |
510 | kfree(bus_entry); | |
511 | kfree(sd); | |
512 | ||
513 | return err; | |
514 | } | |
515 | ||
15856ad5 | 516 | static int pcifront_rescan_root(struct pcifront_device *pdev, |
956a9202 RW |
517 | unsigned int domain, unsigned int bus) |
518 | { | |
519 | int err; | |
520 | struct pci_bus *b; | |
521 | ||
956a9202 RW |
522 | b = pci_find_bus(domain, bus); |
523 | if (!b) | |
524 | /* If the bus is unknown, create it. */ | |
525 | return pcifront_scan_root(pdev, domain, bus); | |
526 | ||
2849752f JG |
527 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", |
528 | domain, bus); | |
529 | ||
956a9202 RW |
530 | err = pcifront_scan_bus(pdev, domain, bus, b); |
531 | ||
532 | /* Claim resources before going "live" with our devices */ | |
533 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
534 | ||
535 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
536 | pci_bus_add_devices(b); | |
537 | ||
538 | return err; | |
539 | } | |
540 | ||
541 | static void free_root_bus_devs(struct pci_bus *bus) | |
542 | { | |
543 | struct pci_dev *dev; | |
544 | ||
545 | while (!list_empty(&bus->devices)) { | |
546 | dev = container_of(bus->devices.next, struct pci_dev, | |
547 | bus_list); | |
7506dc79 | 548 | pci_dbg(dev, "removing device\n"); |
210647af | 549 | pci_stop_and_remove_bus_device(dev); |
956a9202 RW |
550 | } |
551 | } | |
552 | ||
553 | static void pcifront_free_roots(struct pcifront_device *pdev) | |
554 | { | |
555 | struct pci_bus_entry *bus_entry, *t; | |
556 | ||
557 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); | |
558 | ||
a83919e0 | 559 | pci_lock_rescan_remove(); |
956a9202 RW |
560 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { |
561 | list_del(&bus_entry->list); | |
562 | ||
563 | free_root_bus_devs(bus_entry->bus); | |
564 | ||
565 | kfree(bus_entry->bus->sysdata); | |
566 | ||
567 | device_unregister(bus_entry->bus->bridge); | |
568 | pci_remove_bus(bus_entry->bus); | |
569 | ||
570 | kfree(bus_entry); | |
571 | } | |
a83919e0 | 572 | pci_unlock_rescan_remove(); |
956a9202 RW |
573 | } |
574 | ||
575 | static pci_ers_result_t pcifront_common_process(int cmd, | |
576 | struct pcifront_device *pdev, | |
577 | pci_channel_state_t state) | |
578 | { | |
956a9202 RW |
579 | struct pci_driver *pdrv; |
580 | int bus = pdev->sh_info->aer_op.bus; | |
581 | int devfn = pdev->sh_info->aer_op.devfn; | |
dd34bb40 | 582 | int domain = pdev->sh_info->aer_op.domain; |
956a9202 | 583 | struct pci_dev *pcidev; |
956a9202 RW |
584 | |
585 | dev_dbg(&pdev->xdev->dev, | |
586 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", | |
587 | cmd, bus, devfn); | |
956a9202 | 588 | |
dd34bb40 | 589 | pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn); |
43e85554 | 590 | if (!pcidev || !pcidev->dev.driver) { |
2a63dd72 | 591 | dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); |
ff0387c3 | 592 | pci_dev_put(pcidev); |
34ab316d | 593 | return PCI_ERS_RESULT_NONE; |
956a9202 | 594 | } |
43e85554 | 595 | pdrv = to_pci_driver(pcidev->dev.driver); |
956a9202 | 596 | |
34ab316d UKK |
597 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { |
598 | pci_dbg(pcidev, "trying to call AER service\n"); | |
599 | switch (cmd) { | |
600 | case XEN_PCI_OP_aer_detected: | |
601 | return pdrv->err_handler->error_detected(pcidev, state); | |
602 | case XEN_PCI_OP_aer_mmio: | |
603 | return pdrv->err_handler->mmio_enabled(pcidev); | |
604 | case XEN_PCI_OP_aer_slotreset: | |
605 | return pdrv->err_handler->slot_reset(pcidev); | |
606 | case XEN_PCI_OP_aer_resume: | |
607 | pdrv->err_handler->resume(pcidev); | |
608 | return PCI_ERS_RESULT_NONE; | |
609 | default: | |
610 | dev_err(&pdev->xdev->dev, | |
611 | "bad request in aer recovery operation!\n"); | |
956a9202 | 612 | } |
956a9202 | 613 | } |
956a9202 | 614 | |
34ab316d | 615 | return PCI_ERS_RESULT_NONE; |
956a9202 RW |
616 | } |
617 | ||
618 | ||
619 | static void pcifront_do_aer(struct work_struct *data) | |
620 | { | |
621 | struct pcifront_device *pdev = | |
622 | container_of(data, struct pcifront_device, op_work); | |
623 | int cmd = pdev->sh_info->aer_op.cmd; | |
624 | pci_channel_state_t state = | |
625 | (pci_channel_state_t)pdev->sh_info->aer_op.err; | |
626 | ||
f956c1b0 SMI |
627 | /* |
628 | * If a pci_conf op is in progress, we have to wait until it is done | |
629 | * before service aer op | |
630 | */ | |
956a9202 RW |
631 | dev_dbg(&pdev->xdev->dev, |
632 | "pcifront service aer bus %x devfn %x\n", | |
633 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); | |
634 | ||
635 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); | |
636 | ||
637 | /* Post the operation to the guest. */ | |
638 | wmb(); | |
639 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); | |
640 | notify_remote_via_evtchn(pdev->evtchn); | |
641 | ||
642 | /*in case of we lost an aer request in four lines time_window*/ | |
4e857c58 | 643 | smp_mb__before_atomic(); |
956a9202 | 644 | clear_bit(_PDEVB_op_active, &pdev->flags); |
4e857c58 | 645 | smp_mb__after_atomic(); |
956a9202 RW |
646 | |
647 | schedule_pcifront_aer_op(pdev); | |
648 | ||
649 | } | |
650 | ||
651 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) | |
652 | { | |
653 | struct pcifront_device *pdev = dev; | |
f956c1b0 | 654 | |
956a9202 RW |
655 | schedule_pcifront_aer_op(pdev); |
656 | return IRQ_HANDLED; | |
657 | } | |
3d925320 | 658 | static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) |
956a9202 RW |
659 | { |
660 | int err = 0; | |
661 | ||
662 | spin_lock(&pcifront_dev_lock); | |
663 | ||
664 | if (!pcifront_dev) { | |
665 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); | |
666 | pcifront_dev = pdev; | |
098b1aea | 667 | } else |
956a9202 | 668 | err = -EEXIST; |
098b1aea | 669 | |
956a9202 RW |
670 | spin_unlock(&pcifront_dev_lock); |
671 | ||
6f2beb26 | 672 | if (!err && !is_swiotlb_active(&pdev->xdev->dev)) { |
3d925320 KRW |
673 | err = pci_xen_swiotlb_init_late(); |
674 | if (err) | |
675 | dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); | |
676 | } | |
956a9202 RW |
677 | return err; |
678 | } | |
679 | ||
680 | static void pcifront_disconnect(struct pcifront_device *pdev) | |
681 | { | |
682 | spin_lock(&pcifront_dev_lock); | |
683 | ||
684 | if (pdev == pcifront_dev) { | |
685 | dev_info(&pdev->xdev->dev, | |
686 | "Disconnecting PCI Frontend Buses\n"); | |
687 | pcifront_dev = NULL; | |
688 | } | |
689 | ||
690 | spin_unlock(&pcifront_dev_lock); | |
691 | } | |
692 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) | |
693 | { | |
694 | struct pcifront_device *pdev; | |
695 | ||
696 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); | |
697 | if (pdev == NULL) | |
698 | goto out; | |
699 | ||
0e6b139d JG |
700 | if (xenbus_setup_ring(xdev, GFP_KERNEL, (void **)&pdev->sh_info, 1, |
701 | &pdev->gnt_ref)) { | |
956a9202 RW |
702 | kfree(pdev); |
703 | pdev = NULL; | |
704 | goto out; | |
705 | } | |
706 | pdev->sh_info->flags = 0; | |
707 | ||
708 | /*Flag for registering PV AER handler*/ | |
709 | set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags); | |
710 | ||
711 | dev_set_drvdata(&xdev->dev, pdev); | |
712 | pdev->xdev = xdev; | |
713 | ||
714 | INIT_LIST_HEAD(&pdev->root_buses); | |
715 | ||
716 | spin_lock_init(&pdev->sh_info_lock); | |
717 | ||
718 | pdev->evtchn = INVALID_EVTCHN; | |
956a9202 RW |
719 | pdev->irq = -1; |
720 | ||
721 | INIT_WORK(&pdev->op_work, pcifront_do_aer); | |
722 | ||
723 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", | |
724 | pdev, pdev->sh_info); | |
725 | out: | |
726 | return pdev; | |
727 | } | |
728 | ||
729 | static void free_pdev(struct pcifront_device *pdev) | |
730 | { | |
731 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); | |
732 | ||
733 | pcifront_free_roots(pdev); | |
734 | ||
db2e2e6e | 735 | cancel_work_sync(&pdev->op_work); |
956a9202 RW |
736 | |
737 | if (pdev->irq >= 0) | |
738 | unbind_from_irqhandler(pdev->irq, pdev); | |
739 | ||
740 | if (pdev->evtchn != INVALID_EVTCHN) | |
741 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); | |
742 | ||
0e6b139d | 743 | xenbus_teardown_ring((void **)&pdev->sh_info, 1, &pdev->gnt_ref); |
956a9202 RW |
744 | |
745 | dev_set_drvdata(&pdev->xdev->dev, NULL); | |
746 | ||
747 | kfree(pdev); | |
748 | } | |
749 | ||
750 | static int pcifront_publish_info(struct pcifront_device *pdev) | |
751 | { | |
752 | int err = 0; | |
753 | struct xenbus_transaction trans; | |
956a9202 RW |
754 | |
755 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); | |
756 | if (err) | |
757 | goto out; | |
758 | ||
759 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, | |
760 | 0, "pcifront", pdev); | |
761 | ||
762 | if (err < 0) | |
763 | return err; | |
764 | ||
765 | pdev->irq = err; | |
766 | ||
767 | do_publish: | |
768 | err = xenbus_transaction_start(&trans); | |
769 | if (err) { | |
770 | xenbus_dev_fatal(pdev->xdev, err, | |
771 | "Error writing configuration for backend " | |
772 | "(start transaction)"); | |
773 | goto out; | |
774 | } | |
775 | ||
776 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
777 | "pci-op-ref", "%u", pdev->gnt_ref); | |
778 | if (!err) | |
779 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
780 | "event-channel", "%u", pdev->evtchn); | |
781 | if (!err) | |
782 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
783 | "magic", XEN_PCI_MAGIC); | |
784 | ||
785 | if (err) { | |
786 | xenbus_transaction_end(trans, 1); | |
787 | xenbus_dev_fatal(pdev->xdev, err, | |
788 | "Error writing configuration for backend"); | |
789 | goto out; | |
790 | } else { | |
791 | err = xenbus_transaction_end(trans, 0); | |
792 | if (err == -EAGAIN) | |
793 | goto do_publish; | |
794 | else if (err) { | |
795 | xenbus_dev_fatal(pdev->xdev, err, | |
796 | "Error completing transaction " | |
797 | "for backend"); | |
798 | goto out; | |
799 | } | |
800 | } | |
801 | ||
802 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | |
803 | ||
804 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); | |
805 | ||
806 | out: | |
807 | return err; | |
808 | } | |
809 | ||
2849752f | 810 | static void pcifront_connect(struct pcifront_device *pdev) |
956a9202 | 811 | { |
2849752f | 812 | int err; |
956a9202 RW |
813 | int i, num_roots, len; |
814 | char str[64]; | |
815 | unsigned int domain, bus; | |
816 | ||
956a9202 RW |
817 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, |
818 | "root_num", "%d", &num_roots); | |
819 | if (err == -ENOENT) { | |
820 | xenbus_dev_error(pdev->xdev, err, | |
821 | "No PCI Roots found, trying 0000:00"); | |
2849752f | 822 | err = pcifront_rescan_root(pdev, 0, 0); |
23cf1d00 CG |
823 | if (err) { |
824 | xenbus_dev_fatal(pdev->xdev, err, | |
825 | "Error scanning PCI root 0000:00"); | |
2849752f | 826 | return; |
23cf1d00 | 827 | } |
956a9202 RW |
828 | num_roots = 0; |
829 | } else if (err != 1) { | |
2849752f | 830 | xenbus_dev_fatal(pdev->xdev, err >= 0 ? -EINVAL : err, |
956a9202 | 831 | "Error reading number of PCI roots"); |
2849752f | 832 | return; |
956a9202 RW |
833 | } |
834 | ||
835 | for (i = 0; i < num_roots; i++) { | |
836 | len = snprintf(str, sizeof(str), "root-%d", i); | |
2849752f JG |
837 | if (unlikely(len >= (sizeof(str) - 1))) |
838 | return; | |
956a9202 RW |
839 | |
840 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
841 | "%x:%x", &domain, &bus); | |
842 | if (err != 2) { | |
2849752f | 843 | xenbus_dev_fatal(pdev->xdev, err >= 0 ? -EINVAL : err, |
956a9202 | 844 | "Error reading PCI root %d", i); |
2849752f | 845 | return; |
956a9202 RW |
846 | } |
847 | ||
2849752f | 848 | err = pcifront_rescan_root(pdev, domain, bus); |
956a9202 RW |
849 | if (err) { |
850 | xenbus_dev_fatal(pdev->xdev, err, | |
851 | "Error scanning PCI root %04x:%02x", | |
852 | domain, bus); | |
2849752f | 853 | return; |
956a9202 RW |
854 | } |
855 | } | |
856 | ||
2849752f JG |
857 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); |
858 | } | |
859 | ||
860 | static void pcifront_try_connect(struct pcifront_device *pdev) | |
861 | { | |
862 | int err; | |
956a9202 | 863 | |
2849752f JG |
864 | /* Only connect once */ |
865 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
866 | XenbusStateInitialised) | |
867 | return; | |
868 | ||
869 | err = pcifront_connect_and_init_dma(pdev); | |
870 | if (err && err != -EEXIST) { | |
871 | xenbus_dev_fatal(pdev->xdev, err, | |
872 | "Error setting up PCI Frontend"); | |
873 | return; | |
874 | } | |
875 | ||
876 | pcifront_connect(pdev); | |
956a9202 RW |
877 | } |
878 | ||
879 | static int pcifront_try_disconnect(struct pcifront_device *pdev) | |
880 | { | |
881 | int err = 0; | |
882 | enum xenbus_state prev_state; | |
883 | ||
884 | ||
885 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); | |
886 | ||
887 | if (prev_state >= XenbusStateClosing) | |
888 | goto out; | |
889 | ||
890 | if (prev_state == XenbusStateConnected) { | |
891 | pcifront_free_roots(pdev); | |
892 | pcifront_disconnect(pdev); | |
893 | } | |
894 | ||
895 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); | |
896 | ||
897 | out: | |
898 | ||
899 | return err; | |
900 | } | |
901 | ||
2849752f | 902 | static void pcifront_attach_devices(struct pcifront_device *pdev) |
956a9202 | 903 | { |
2849752f | 904 | if (xenbus_read_driver_state(pdev->xdev->nodename) == |
956a9202 | 905 | XenbusStateReconfiguring) |
2849752f | 906 | pcifront_connect(pdev); |
956a9202 RW |
907 | } |
908 | ||
909 | static int pcifront_detach_devices(struct pcifront_device *pdev) | |
910 | { | |
911 | int err = 0; | |
912 | int i, num_devs; | |
728c2edf | 913 | enum xenbus_state state; |
956a9202 | 914 | unsigned int domain, bus, slot, func; |
956a9202 RW |
915 | struct pci_dev *pci_dev; |
916 | char str[64]; | |
917 | ||
728c2edf JA |
918 | state = xenbus_read_driver_state(pdev->xdev->nodename); |
919 | if (state == XenbusStateInitialised) { | |
920 | dev_dbg(&pdev->xdev->dev, "Handle skipped connect.\n"); | |
921 | /* We missed Connected and need to initialize. */ | |
922 | err = pcifront_connect_and_init_dma(pdev); | |
923 | if (err && err != -EEXIST) { | |
924 | xenbus_dev_fatal(pdev->xdev, err, | |
925 | "Error setting up PCI Frontend"); | |
926 | goto out; | |
927 | } | |
928 | ||
929 | goto out_switch_state; | |
930 | } else if (state != XenbusStateConnected) { | |
956a9202 | 931 | goto out; |
728c2edf | 932 | } |
956a9202 RW |
933 | |
934 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", | |
935 | &num_devs); | |
936 | if (err != 1) { | |
937 | if (err >= 0) | |
938 | err = -EINVAL; | |
939 | xenbus_dev_fatal(pdev->xdev, err, | |
940 | "Error reading number of PCI devices"); | |
941 | goto out; | |
942 | } | |
943 | ||
944 | /* Find devices being detached and remove them. */ | |
945 | for (i = 0; i < num_devs; i++) { | |
946 | int l, state; | |
f956c1b0 | 947 | |
956a9202 RW |
948 | l = snprintf(str, sizeof(str), "state-%d", i); |
949 | if (unlikely(l >= (sizeof(str) - 1))) { | |
950 | err = -ENOMEM; | |
951 | goto out; | |
952 | } | |
58faf07b JG |
953 | state = xenbus_read_unsigned(pdev->xdev->otherend, str, |
954 | XenbusStateUnknown); | |
956a9202 RW |
955 | |
956 | if (state != XenbusStateClosing) | |
957 | continue; | |
958 | ||
959 | /* Remove device. */ | |
960 | l = snprintf(str, sizeof(str), "vdev-%d", i); | |
961 | if (unlikely(l >= (sizeof(str) - 1))) { | |
962 | err = -ENOMEM; | |
963 | goto out; | |
964 | } | |
965 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
966 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | |
967 | if (err != 4) { | |
968 | if (err >= 0) | |
969 | err = -EINVAL; | |
970 | xenbus_dev_fatal(pdev->xdev, err, | |
971 | "Error reading PCI device %d", i); | |
972 | goto out; | |
973 | } | |
974 | ||
2ccc246d JL |
975 | pci_dev = pci_get_domain_bus_and_slot(domain, bus, |
976 | PCI_DEVFN(slot, func)); | |
956a9202 RW |
977 | if (!pci_dev) { |
978 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 979 | "Cannot get PCI device %04x:%02x:%02x.%d\n", |
956a9202 RW |
980 | domain, bus, slot, func); |
981 | continue; | |
982 | } | |
a83919e0 | 983 | pci_lock_rescan_remove(); |
210647af | 984 | pci_stop_and_remove_bus_device(pci_dev); |
956a9202 | 985 | pci_dev_put(pci_dev); |
a83919e0 | 986 | pci_unlock_rescan_remove(); |
956a9202 RW |
987 | |
988 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 989 | "PCI device %04x:%02x:%02x.%d removed.\n", |
956a9202 RW |
990 | domain, bus, slot, func); |
991 | } | |
992 | ||
728c2edf | 993 | out_switch_state: |
956a9202 RW |
994 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); |
995 | ||
996 | out: | |
997 | return err; | |
998 | } | |
999 | ||
f956c1b0 | 1000 | static void pcifront_backend_changed(struct xenbus_device *xdev, |
956a9202 RW |
1001 | enum xenbus_state be_state) |
1002 | { | |
1003 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1004 | ||
1005 | switch (be_state) { | |
1006 | case XenbusStateUnknown: | |
1007 | case XenbusStateInitialising: | |
1008 | case XenbusStateInitWait: | |
1009 | case XenbusStateInitialised: | |
956a9202 RW |
1010 | break; |
1011 | ||
1012 | case XenbusStateConnected: | |
1013 | pcifront_try_connect(pdev); | |
1014 | break; | |
1015 | ||
d5af64de DV |
1016 | case XenbusStateClosed: |
1017 | if (xdev->state == XenbusStateClosed) | |
1018 | break; | |
df561f66 | 1019 | fallthrough; /* Missed the backend's CLOSING state */ |
956a9202 RW |
1020 | case XenbusStateClosing: |
1021 | dev_warn(&xdev->dev, "backend going away!\n"); | |
1022 | pcifront_try_disconnect(pdev); | |
1023 | break; | |
1024 | ||
1025 | case XenbusStateReconfiguring: | |
1026 | pcifront_detach_devices(pdev); | |
1027 | break; | |
1028 | ||
1029 | case XenbusStateReconfigured: | |
1030 | pcifront_attach_devices(pdev); | |
1031 | break; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, | |
1036 | const struct xenbus_device_id *id) | |
1037 | { | |
1038 | int err = 0; | |
1039 | struct pcifront_device *pdev = alloc_pdev(xdev); | |
1040 | ||
1041 | if (pdev == NULL) { | |
1042 | err = -ENOMEM; | |
1043 | xenbus_dev_fatal(xdev, err, | |
1044 | "Error allocating pcifront_device struct"); | |
1045 | goto out; | |
1046 | } | |
1047 | ||
1048 | err = pcifront_publish_info(pdev); | |
1049 | if (err) | |
1050 | free_pdev(pdev); | |
1051 | ||
1052 | out: | |
1053 | return err; | |
1054 | } | |
1055 | ||
7cffcade | 1056 | static void pcifront_xenbus_remove(struct xenbus_device *xdev) |
956a9202 RW |
1057 | { |
1058 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
f956c1b0 | 1059 | |
956a9202 RW |
1060 | if (pdev) |
1061 | free_pdev(pdev); | |
956a9202 RW |
1062 | } |
1063 | ||
1064 | static const struct xenbus_device_id xenpci_ids[] = { | |
1065 | {"pci"}, | |
1066 | {""}, | |
1067 | }; | |
1068 | ||
95afae48 DV |
1069 | static struct xenbus_driver xenpci_driver = { |
1070 | .name = "pcifront", | |
1071 | .ids = xenpci_ids, | |
956a9202 RW |
1072 | .probe = pcifront_xenbus_probe, |
1073 | .remove = pcifront_xenbus_remove, | |
1074 | .otherend_changed = pcifront_backend_changed, | |
95afae48 | 1075 | }; |
956a9202 RW |
1076 | |
1077 | static int __init pcifront_init(void) | |
1078 | { | |
1079 | if (!xen_pv_domain() || xen_initial_domain()) | |
1080 | return -ENODEV; | |
1081 | ||
51c71a3b KRW |
1082 | if (!xen_has_pv_devices()) |
1083 | return -ENODEV; | |
1084 | ||
956a9202 RW |
1085 | pci_frontend_registrar(1 /* enable */); |
1086 | ||
73db144b | 1087 | return xenbus_register_frontend(&xenpci_driver); |
956a9202 RW |
1088 | } |
1089 | ||
1090 | static void __exit pcifront_cleanup(void) | |
1091 | { | |
73db144b | 1092 | xenbus_unregister_driver(&xenpci_driver); |
956a9202 RW |
1093 | pci_frontend_registrar(0 /* disable */); |
1094 | } | |
1095 | module_init(pcifront_init); | |
1096 | module_exit(pcifront_cleanup); | |
1097 | ||
1098 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); | |
1099 | MODULE_LICENSE("GPL"); | |
1100 | MODULE_ALIAS("xen:pci"); |