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> |
956a9202 RW |
28 | #define INVALID_GRANT_REF (0) |
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; | |
44 | int gnt_ref; | |
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 | ||
80 | static int verbose_request; | |
81 | module_param(verbose_request, int, 0644); | |
82 | ||
83 | static int errno_to_pcibios_err(int errno) | |
84 | { | |
85 | switch (errno) { | |
86 | case XEN_PCI_ERR_success: | |
87 | return PCIBIOS_SUCCESSFUL; | |
88 | ||
89 | case XEN_PCI_ERR_dev_not_found: | |
90 | return PCIBIOS_DEVICE_NOT_FOUND; | |
91 | ||
92 | case XEN_PCI_ERR_invalid_offset: | |
93 | case XEN_PCI_ERR_op_failed: | |
94 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
95 | ||
96 | case XEN_PCI_ERR_not_implemented: | |
97 | return PCIBIOS_FUNC_NOT_SUPPORTED; | |
98 | ||
99 | case XEN_PCI_ERR_access_denied: | |
100 | return PCIBIOS_SET_FAILED; | |
101 | } | |
102 | return errno; | |
103 | } | |
104 | ||
105 | static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev) | |
106 | { | |
107 | if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags) | |
108 | && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) { | |
109 | dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n"); | |
110 | schedule_work(&pdev->op_work); | |
111 | } | |
112 | } | |
113 | ||
114 | static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) | |
115 | { | |
116 | int err = 0; | |
117 | struct xen_pci_op *active_op = &pdev->sh_info->op; | |
118 | unsigned long irq_flags; | |
119 | evtchn_port_t port = pdev->evtchn; | |
120 | unsigned irq = pdev->irq; | |
121 | s64 ns, ns_timeout; | |
956a9202 RW |
122 | |
123 | spin_lock_irqsave(&pdev->sh_info_lock, irq_flags); | |
124 | ||
125 | memcpy(active_op, op, sizeof(struct xen_pci_op)); | |
126 | ||
127 | /* Go */ | |
128 | wmb(); | |
129 | set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags); | |
130 | notify_remote_via_evtchn(port); | |
131 | ||
132 | /* | |
133 | * We set a poll timeout of 3 seconds but give up on return after | |
134 | * 2 seconds. It is better to time out too late rather than too early | |
135 | * (in the latter case we end up continually re-executing poll() with a | |
136 | * timeout in the past). 1s difference gives plenty of slack for error. | |
137 | */ | |
e1d5bbcd | 138 | ns_timeout = ktime_get_ns() + 2 * (s64)NSEC_PER_SEC; |
956a9202 RW |
139 | |
140 | xen_clear_irq_pending(irq); | |
141 | ||
142 | while (test_bit(_XEN_PCIF_active, | |
143 | (unsigned long *)&pdev->sh_info->flags)) { | |
144 | xen_poll_irq_timeout(irq, jiffies + 3*HZ); | |
145 | xen_clear_irq_pending(irq); | |
e1d5bbcd | 146 | ns = ktime_get_ns(); |
956a9202 RW |
147 | if (ns > ns_timeout) { |
148 | dev_err(&pdev->xdev->dev, | |
149 | "pciback not responding!!!\n"); | |
150 | clear_bit(_XEN_PCIF_active, | |
151 | (unsigned long *)&pdev->sh_info->flags); | |
152 | err = XEN_PCI_ERR_dev_not_found; | |
153 | goto out; | |
154 | } | |
155 | } | |
156 | ||
157 | /* | |
158 | * We might lose backend service request since we | |
159 | * reuse same evtchn with pci_conf backend response. So re-schedule | |
160 | * aer pcifront service. | |
161 | */ | |
162 | if (test_bit(_XEN_PCIB_active, | |
163 | (unsigned long *)&pdev->sh_info->flags)) { | |
164 | dev_err(&pdev->xdev->dev, | |
165 | "schedule aer pcifront service\n"); | |
166 | schedule_pcifront_aer_op(pdev); | |
167 | } | |
168 | ||
169 | memcpy(op, active_op, sizeof(struct xen_pci_op)); | |
170 | ||
171 | err = op->err; | |
172 | out: | |
173 | spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags); | |
174 | return err; | |
175 | } | |
176 | ||
177 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
178 | static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn, | |
179 | int where, int size, u32 *val) | |
180 | { | |
181 | int err = 0; | |
182 | struct xen_pci_op op = { | |
183 | .cmd = XEN_PCI_OP_conf_read, | |
184 | .domain = pci_domain_nr(bus), | |
185 | .bus = bus->number, | |
186 | .devfn = devfn, | |
187 | .offset = where, | |
188 | .size = size, | |
189 | }; | |
190 | struct pcifront_sd *sd = bus->sysdata; | |
191 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
192 | ||
193 | if (verbose_request) | |
194 | dev_info(&pdev->xdev->dev, | |
e4de866a | 195 | "read dev=%04x:%02x:%02x.%d - offset %x size %d\n", |
956a9202 RW |
196 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), |
197 | PCI_FUNC(devfn), where, size); | |
198 | ||
199 | err = do_pci_op(pdev, &op); | |
200 | ||
201 | if (likely(!err)) { | |
202 | if (verbose_request) | |
203 | dev_info(&pdev->xdev->dev, "read got back value %x\n", | |
204 | op.value); | |
205 | ||
206 | *val = op.value; | |
207 | } else if (err == -ENODEV) { | |
208 | /* No device here, pretend that it just returned 0 */ | |
209 | err = 0; | |
210 | *val = 0; | |
211 | } | |
212 | ||
213 | return errno_to_pcibios_err(err); | |
214 | } | |
215 | ||
216 | /* Access to this function is spinlocked in drivers/pci/access.c */ | |
217 | static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn, | |
218 | int where, int size, u32 val) | |
219 | { | |
220 | struct xen_pci_op op = { | |
221 | .cmd = XEN_PCI_OP_conf_write, | |
222 | .domain = pci_domain_nr(bus), | |
223 | .bus = bus->number, | |
224 | .devfn = devfn, | |
225 | .offset = where, | |
226 | .size = size, | |
227 | .value = val, | |
228 | }; | |
229 | struct pcifront_sd *sd = bus->sysdata; | |
230 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
231 | ||
232 | if (verbose_request) | |
233 | dev_info(&pdev->xdev->dev, | |
e4de866a | 234 | "write dev=%04x:%02x:%02x.%d - " |
956a9202 RW |
235 | "offset %x size %d val %x\n", |
236 | pci_domain_nr(bus), bus->number, | |
237 | PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); | |
238 | ||
239 | return errno_to_pcibios_err(do_pci_op(pdev, &op)); | |
240 | } | |
241 | ||
b8b0f559 | 242 | static struct pci_ops pcifront_bus_ops = { |
956a9202 RW |
243 | .read = pcifront_bus_read, |
244 | .write = pcifront_bus_write, | |
245 | }; | |
246 | ||
247 | #ifdef CONFIG_PCI_MSI | |
248 | static int pci_frontend_enable_msix(struct pci_dev *dev, | |
cc0f89c4 | 249 | int vector[], int nvec) |
956a9202 RW |
250 | { |
251 | int err; | |
252 | int i; | |
253 | struct xen_pci_op op = { | |
254 | .cmd = XEN_PCI_OP_enable_msix, | |
255 | .domain = pci_domain_nr(dev->bus), | |
256 | .bus = dev->bus->number, | |
257 | .devfn = dev->devfn, | |
258 | .value = nvec, | |
259 | }; | |
260 | struct pcifront_sd *sd = dev->bus->sysdata; | |
261 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
262 | struct msi_desc *entry; | |
263 | ||
264 | if (nvec > SH_INFO_MAX_VEC) { | |
7506dc79 FL |
265 | pci_err(dev, "too many vectors (0x%x) for PCI frontend:" |
266 | " Increase SH_INFO_MAX_VEC\n", nvec); | |
956a9202 RW |
267 | return -EINVAL; |
268 | } | |
269 | ||
270 | i = 0; | |
5004e98a | 271 | for_each_pci_msi_entry(entry, dev) { |
956a9202 RW |
272 | op.msix_entries[i].entry = entry->msi_attrib.entry_nr; |
273 | /* Vector is useless at this point. */ | |
274 | op.msix_entries[i].vector = -1; | |
275 | i++; | |
276 | } | |
277 | ||
278 | err = do_pci_op(pdev, &op); | |
279 | ||
280 | if (likely(!err)) { | |
281 | if (likely(!op.value)) { | |
282 | /* we get the result */ | |
1d461052 KRW |
283 | for (i = 0; i < nvec; i++) { |
284 | if (op.msix_entries[i].vector <= 0) { | |
7506dc79 | 285 | pci_warn(dev, "MSI-X entry %d is invalid: %d!\n", |
1d461052 KRW |
286 | i, op.msix_entries[i].vector); |
287 | err = -EINVAL; | |
cc0f89c4 | 288 | vector[i] = -1; |
1d461052 KRW |
289 | continue; |
290 | } | |
cc0f89c4 | 291 | vector[i] = op.msix_entries[i].vector; |
1d461052 | 292 | } |
956a9202 RW |
293 | } else { |
294 | printk(KERN_DEBUG "enable msix get value %x\n", | |
295 | op.value); | |
f09d8432 | 296 | err = op.value; |
956a9202 RW |
297 | } |
298 | } else { | |
7506dc79 | 299 | pci_err(dev, "enable msix get err %x\n", err); |
956a9202 | 300 | } |
1d461052 | 301 | return err; |
956a9202 RW |
302 | } |
303 | ||
304 | static void pci_frontend_disable_msix(struct pci_dev *dev) | |
305 | { | |
306 | int err; | |
307 | struct xen_pci_op op = { | |
308 | .cmd = XEN_PCI_OP_disable_msix, | |
309 | .domain = pci_domain_nr(dev->bus), | |
310 | .bus = dev->bus->number, | |
311 | .devfn = dev->devfn, | |
312 | }; | |
313 | struct pcifront_sd *sd = dev->bus->sysdata; | |
314 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
315 | ||
316 | err = do_pci_op(pdev, &op); | |
317 | ||
318 | /* What should do for error ? */ | |
319 | if (err) | |
7506dc79 | 320 | pci_err(dev, "pci_disable_msix get err %x\n", err); |
956a9202 RW |
321 | } |
322 | ||
cc0f89c4 | 323 | static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[]) |
956a9202 RW |
324 | { |
325 | int err; | |
326 | struct xen_pci_op op = { | |
327 | .cmd = XEN_PCI_OP_enable_msi, | |
328 | .domain = pci_domain_nr(dev->bus), | |
329 | .bus = dev->bus->number, | |
330 | .devfn = dev->devfn, | |
331 | }; | |
332 | struct pcifront_sd *sd = dev->bus->sysdata; | |
333 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
334 | ||
335 | err = do_pci_op(pdev, &op); | |
336 | if (likely(!err)) { | |
cc0f89c4 | 337 | vector[0] = op.value; |
1d461052 | 338 | if (op.value <= 0) { |
7506dc79 | 339 | pci_warn(dev, "MSI entry is invalid: %d!\n", |
1d461052 KRW |
340 | op.value); |
341 | err = -EINVAL; | |
cc0f89c4 | 342 | vector[0] = -1; |
1d461052 | 343 | } |
956a9202 | 344 | } else { |
7506dc79 | 345 | pci_err(dev, "pci frontend enable msi failed for dev " |
956a9202 RW |
346 | "%x:%x\n", op.bus, op.devfn); |
347 | err = -EINVAL; | |
348 | } | |
349 | return err; | |
350 | } | |
351 | ||
352 | static void pci_frontend_disable_msi(struct pci_dev *dev) | |
353 | { | |
354 | int err; | |
355 | struct xen_pci_op op = { | |
356 | .cmd = XEN_PCI_OP_disable_msi, | |
357 | .domain = pci_domain_nr(dev->bus), | |
358 | .bus = dev->bus->number, | |
359 | .devfn = dev->devfn, | |
360 | }; | |
361 | struct pcifront_sd *sd = dev->bus->sysdata; | |
362 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | |
363 | ||
364 | err = do_pci_op(pdev, &op); | |
365 | if (err == XEN_PCI_ERR_dev_not_found) { | |
366 | /* XXX No response from backend, what shall we do? */ | |
367 | printk(KERN_DEBUG "get no response from backend for disable MSI\n"); | |
368 | return; | |
369 | } | |
370 | if (err) | |
371 | /* how can pciback notify us fail? */ | |
372 | printk(KERN_DEBUG "get fake response frombackend\n"); | |
373 | } | |
374 | ||
375 | static struct xen_pci_frontend_ops pci_frontend_ops = { | |
376 | .enable_msi = pci_frontend_enable_msi, | |
377 | .disable_msi = pci_frontend_disable_msi, | |
378 | .enable_msix = pci_frontend_enable_msix, | |
379 | .disable_msix = pci_frontend_disable_msix, | |
380 | }; | |
381 | ||
382 | static void pci_frontend_registrar(int enable) | |
383 | { | |
384 | if (enable) | |
385 | xen_pci_frontend = &pci_frontend_ops; | |
386 | else | |
387 | xen_pci_frontend = NULL; | |
388 | }; | |
389 | #else | |
390 | static inline void pci_frontend_registrar(int enable) { }; | |
391 | #endif /* CONFIG_PCI_MSI */ | |
392 | ||
393 | /* Claim resources for the PCI frontend as-is, backend won't allow changes */ | |
394 | static int pcifront_claim_resource(struct pci_dev *dev, void *data) | |
395 | { | |
396 | struct pcifront_device *pdev = data; | |
397 | int i; | |
398 | struct resource *r; | |
399 | ||
400 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
401 | r = &dev->resource[i]; | |
402 | ||
403 | if (!r->parent && r->start && r->flags) { | |
404 | dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n", | |
405 | pci_name(dev), i); | |
406 | if (pci_claim_resource(dev, i)) { | |
917e3e65 KRW |
407 | dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! " |
408 | "Device offline. Try using e820_host=1 in the guest config.\n", | |
956a9202 RW |
409 | pci_name(dev), i); |
410 | } | |
411 | } | |
412 | } | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
15856ad5 | 417 | static int pcifront_scan_bus(struct pcifront_device *pdev, |
956a9202 RW |
418 | unsigned int domain, unsigned int bus, |
419 | struct pci_bus *b) | |
420 | { | |
421 | struct pci_dev *d; | |
422 | unsigned int devfn; | |
423 | ||
424 | /* Scan the bus for functions and add. | |
425 | * We omit handling of PCI bridge attachment because pciback prevents | |
426 | * bridges from being exported. | |
427 | */ | |
428 | for (devfn = 0; devfn < 0x100; devfn++) { | |
429 | d = pci_get_slot(b, devfn); | |
430 | if (d) { | |
431 | /* Device is already known. */ | |
432 | pci_dev_put(d); | |
433 | continue; | |
434 | } | |
435 | ||
436 | d = pci_scan_single_device(b, devfn); | |
437 | if (d) | |
438 | dev_info(&pdev->xdev->dev, "New device on " | |
e4de866a | 439 | "%04x:%02x:%02x.%d found.\n", domain, bus, |
956a9202 RW |
440 | PCI_SLOT(devfn), PCI_FUNC(devfn)); |
441 | } | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
15856ad5 | 446 | static int pcifront_scan_root(struct pcifront_device *pdev, |
956a9202 RW |
447 | unsigned int domain, unsigned int bus) |
448 | { | |
449 | struct pci_bus *b; | |
515d425b | 450 | LIST_HEAD(resources); |
956a9202 RW |
451 | struct pcifront_sd *sd = NULL; |
452 | struct pci_bus_entry *bus_entry = NULL; | |
453 | int err = 0; | |
515d425b AB |
454 | static struct resource busn_res = { |
455 | .start = 0, | |
456 | .end = 255, | |
457 | .flags = IORESOURCE_BUS, | |
458 | }; | |
956a9202 RW |
459 | |
460 | #ifndef CONFIG_PCI_DOMAINS | |
461 | if (domain != 0) { | |
462 | dev_err(&pdev->xdev->dev, | |
463 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
464 | dev_err(&pdev->xdev->dev, | |
465 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
466 | err = -EINVAL; | |
467 | goto err_out; | |
468 | } | |
469 | #endif | |
470 | ||
471 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", | |
472 | domain, bus); | |
473 | ||
4d8c8bd6 KRW |
474 | bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL); |
475 | sd = kzalloc(sizeof(*sd), GFP_KERNEL); | |
956a9202 RW |
476 | if (!bus_entry || !sd) { |
477 | err = -ENOMEM; | |
478 | goto err_out; | |
479 | } | |
515d425b AB |
480 | pci_add_resource(&resources, &ioport_resource); |
481 | pci_add_resource(&resources, &iomem_resource); | |
482 | pci_add_resource(&resources, &busn_res); | |
956a9202 RW |
483 | pcifront_init_sd(sd, domain, bus, pdev); |
484 | ||
a83919e0 RW |
485 | pci_lock_rescan_remove(); |
486 | ||
515d425b AB |
487 | b = pci_scan_root_bus(&pdev->xdev->dev, bus, |
488 | &pcifront_bus_ops, sd, &resources); | |
956a9202 RW |
489 | if (!b) { |
490 | dev_err(&pdev->xdev->dev, | |
491 | "Error creating PCI Frontend Bus!\n"); | |
492 | err = -ENOMEM; | |
a83919e0 | 493 | pci_unlock_rescan_remove(); |
515d425b | 494 | pci_free_resource_list(&resources); |
956a9202 RW |
495 | goto err_out; |
496 | } | |
497 | ||
498 | bus_entry->bus = b; | |
499 | ||
500 | list_add(&bus_entry->list, &pdev->root_buses); | |
501 | ||
515d425b | 502 | /* pci_scan_root_bus skips devices which do not have a |
956a9202 RW |
503 | * devfn==0. The pcifront_scan_bus enumerates all devfn. */ |
504 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
505 | ||
506 | /* Claim resources before going "live" with our devices */ | |
507 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
508 | ||
509 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
510 | pci_bus_add_devices(b); | |
511 | ||
a83919e0 | 512 | pci_unlock_rescan_remove(); |
956a9202 RW |
513 | return err; |
514 | ||
515 | err_out: | |
516 | kfree(bus_entry); | |
517 | kfree(sd); | |
518 | ||
519 | return err; | |
520 | } | |
521 | ||
15856ad5 | 522 | static int pcifront_rescan_root(struct pcifront_device *pdev, |
956a9202 RW |
523 | unsigned int domain, unsigned int bus) |
524 | { | |
525 | int err; | |
526 | struct pci_bus *b; | |
527 | ||
528 | #ifndef CONFIG_PCI_DOMAINS | |
529 | if (domain != 0) { | |
530 | dev_err(&pdev->xdev->dev, | |
531 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | |
532 | dev_err(&pdev->xdev->dev, | |
533 | "Please compile with CONFIG_PCI_DOMAINS\n"); | |
534 | return -EINVAL; | |
535 | } | |
536 | #endif | |
537 | ||
538 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", | |
539 | domain, bus); | |
540 | ||
541 | b = pci_find_bus(domain, bus); | |
542 | if (!b) | |
543 | /* If the bus is unknown, create it. */ | |
544 | return pcifront_scan_root(pdev, domain, bus); | |
545 | ||
546 | err = pcifront_scan_bus(pdev, domain, bus, b); | |
547 | ||
548 | /* Claim resources before going "live" with our devices */ | |
549 | pci_walk_bus(b, pcifront_claim_resource, pdev); | |
550 | ||
551 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | |
552 | pci_bus_add_devices(b); | |
553 | ||
554 | return err; | |
555 | } | |
556 | ||
557 | static void free_root_bus_devs(struct pci_bus *bus) | |
558 | { | |
559 | struct pci_dev *dev; | |
560 | ||
561 | while (!list_empty(&bus->devices)) { | |
562 | dev = container_of(bus->devices.next, struct pci_dev, | |
563 | bus_list); | |
7506dc79 | 564 | pci_dbg(dev, "removing device\n"); |
210647af | 565 | pci_stop_and_remove_bus_device(dev); |
956a9202 RW |
566 | } |
567 | } | |
568 | ||
569 | static void pcifront_free_roots(struct pcifront_device *pdev) | |
570 | { | |
571 | struct pci_bus_entry *bus_entry, *t; | |
572 | ||
573 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); | |
574 | ||
a83919e0 | 575 | pci_lock_rescan_remove(); |
956a9202 RW |
576 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { |
577 | list_del(&bus_entry->list); | |
578 | ||
579 | free_root_bus_devs(bus_entry->bus); | |
580 | ||
581 | kfree(bus_entry->bus->sysdata); | |
582 | ||
583 | device_unregister(bus_entry->bus->bridge); | |
584 | pci_remove_bus(bus_entry->bus); | |
585 | ||
586 | kfree(bus_entry); | |
587 | } | |
a83919e0 | 588 | pci_unlock_rescan_remove(); |
956a9202 RW |
589 | } |
590 | ||
591 | static pci_ers_result_t pcifront_common_process(int cmd, | |
592 | struct pcifront_device *pdev, | |
593 | pci_channel_state_t state) | |
594 | { | |
595 | pci_ers_result_t result; | |
596 | struct pci_driver *pdrv; | |
597 | int bus = pdev->sh_info->aer_op.bus; | |
598 | int devfn = pdev->sh_info->aer_op.devfn; | |
dd34bb40 | 599 | int domain = pdev->sh_info->aer_op.domain; |
956a9202 RW |
600 | struct pci_dev *pcidev; |
601 | int flag = 0; | |
602 | ||
603 | dev_dbg(&pdev->xdev->dev, | |
604 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", | |
605 | cmd, bus, devfn); | |
606 | result = PCI_ERS_RESULT_NONE; | |
607 | ||
dd34bb40 | 608 | pcidev = pci_get_domain_bus_and_slot(domain, bus, devfn); |
956a9202 | 609 | if (!pcidev || !pcidev->driver) { |
2a63dd72 | 610 | dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n"); |
ff0387c3 | 611 | pci_dev_put(pcidev); |
956a9202 RW |
612 | return result; |
613 | } | |
614 | pdrv = pcidev->driver; | |
615 | ||
07d25146 | 616 | if (pdrv) { |
956a9202 | 617 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { |
7506dc79 | 618 | pci_dbg(pcidev, "trying to call AER service\n"); |
956a9202 RW |
619 | if (pcidev) { |
620 | flag = 1; | |
621 | switch (cmd) { | |
622 | case XEN_PCI_OP_aer_detected: | |
623 | result = pdrv->err_handler-> | |
624 | error_detected(pcidev, state); | |
625 | break; | |
626 | case XEN_PCI_OP_aer_mmio: | |
627 | result = pdrv->err_handler-> | |
628 | mmio_enabled(pcidev); | |
629 | break; | |
630 | case XEN_PCI_OP_aer_slotreset: | |
631 | result = pdrv->err_handler-> | |
632 | slot_reset(pcidev); | |
633 | break; | |
634 | case XEN_PCI_OP_aer_resume: | |
635 | pdrv->err_handler->resume(pcidev); | |
636 | break; | |
637 | default: | |
638 | dev_err(&pdev->xdev->dev, | |
639 | "bad request in aer recovery " | |
640 | "operation!\n"); | |
641 | ||
642 | } | |
643 | } | |
644 | } | |
956a9202 RW |
645 | } |
646 | if (!flag) | |
647 | result = PCI_ERS_RESULT_NONE; | |
648 | ||
649 | return result; | |
650 | } | |
651 | ||
652 | ||
653 | static void pcifront_do_aer(struct work_struct *data) | |
654 | { | |
655 | struct pcifront_device *pdev = | |
656 | container_of(data, struct pcifront_device, op_work); | |
657 | int cmd = pdev->sh_info->aer_op.cmd; | |
658 | pci_channel_state_t state = | |
659 | (pci_channel_state_t)pdev->sh_info->aer_op.err; | |
660 | ||
661 | /*If a pci_conf op is in progress, | |
662 | we have to wait until it is done before service aer op*/ | |
663 | dev_dbg(&pdev->xdev->dev, | |
664 | "pcifront service aer bus %x devfn %x\n", | |
665 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); | |
666 | ||
667 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); | |
668 | ||
669 | /* Post the operation to the guest. */ | |
670 | wmb(); | |
671 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); | |
672 | notify_remote_via_evtchn(pdev->evtchn); | |
673 | ||
674 | /*in case of we lost an aer request in four lines time_window*/ | |
4e857c58 | 675 | smp_mb__before_atomic(); |
956a9202 | 676 | clear_bit(_PDEVB_op_active, &pdev->flags); |
4e857c58 | 677 | smp_mb__after_atomic(); |
956a9202 RW |
678 | |
679 | schedule_pcifront_aer_op(pdev); | |
680 | ||
681 | } | |
682 | ||
683 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) | |
684 | { | |
685 | struct pcifront_device *pdev = dev; | |
686 | schedule_pcifront_aer_op(pdev); | |
687 | return IRQ_HANDLED; | |
688 | } | |
3d925320 | 689 | static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) |
956a9202 RW |
690 | { |
691 | int err = 0; | |
692 | ||
693 | spin_lock(&pcifront_dev_lock); | |
694 | ||
695 | if (!pcifront_dev) { | |
696 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); | |
697 | pcifront_dev = pdev; | |
098b1aea | 698 | } else |
956a9202 | 699 | err = -EEXIST; |
098b1aea | 700 | |
956a9202 RW |
701 | spin_unlock(&pcifront_dev_lock); |
702 | ||
3d925320 KRW |
703 | if (!err && !swiotlb_nr_tbl()) { |
704 | err = pci_xen_swiotlb_init_late(); | |
705 | if (err) | |
706 | dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); | |
707 | } | |
956a9202 RW |
708 | return err; |
709 | } | |
710 | ||
711 | static void pcifront_disconnect(struct pcifront_device *pdev) | |
712 | { | |
713 | spin_lock(&pcifront_dev_lock); | |
714 | ||
715 | if (pdev == pcifront_dev) { | |
716 | dev_info(&pdev->xdev->dev, | |
717 | "Disconnecting PCI Frontend Buses\n"); | |
718 | pcifront_dev = NULL; | |
719 | } | |
720 | ||
721 | spin_unlock(&pcifront_dev_lock); | |
722 | } | |
723 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) | |
724 | { | |
725 | struct pcifront_device *pdev; | |
726 | ||
727 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); | |
728 | if (pdev == NULL) | |
729 | goto out; | |
730 | ||
731 | pdev->sh_info = | |
732 | (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL); | |
733 | if (pdev->sh_info == NULL) { | |
734 | kfree(pdev); | |
735 | pdev = NULL; | |
736 | goto out; | |
737 | } | |
738 | pdev->sh_info->flags = 0; | |
739 | ||
740 | /*Flag for registering PV AER handler*/ | |
741 | set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags); | |
742 | ||
743 | dev_set_drvdata(&xdev->dev, pdev); | |
744 | pdev->xdev = xdev; | |
745 | ||
746 | INIT_LIST_HEAD(&pdev->root_buses); | |
747 | ||
748 | spin_lock_init(&pdev->sh_info_lock); | |
749 | ||
750 | pdev->evtchn = INVALID_EVTCHN; | |
751 | pdev->gnt_ref = INVALID_GRANT_REF; | |
752 | pdev->irq = -1; | |
753 | ||
754 | INIT_WORK(&pdev->op_work, pcifront_do_aer); | |
755 | ||
756 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", | |
757 | pdev, pdev->sh_info); | |
758 | out: | |
759 | return pdev; | |
760 | } | |
761 | ||
762 | static void free_pdev(struct pcifront_device *pdev) | |
763 | { | |
764 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); | |
765 | ||
766 | pcifront_free_roots(pdev); | |
767 | ||
db2e2e6e | 768 | cancel_work_sync(&pdev->op_work); |
956a9202 RW |
769 | |
770 | if (pdev->irq >= 0) | |
771 | unbind_from_irqhandler(pdev->irq, pdev); | |
772 | ||
773 | if (pdev->evtchn != INVALID_EVTCHN) | |
774 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); | |
775 | ||
776 | if (pdev->gnt_ref != INVALID_GRANT_REF) | |
777 | gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */, | |
778 | (unsigned long)pdev->sh_info); | |
779 | else | |
780 | free_page((unsigned long)pdev->sh_info); | |
781 | ||
782 | dev_set_drvdata(&pdev->xdev->dev, NULL); | |
783 | ||
784 | kfree(pdev); | |
785 | } | |
786 | ||
787 | static int pcifront_publish_info(struct pcifront_device *pdev) | |
788 | { | |
789 | int err = 0; | |
790 | struct xenbus_transaction trans; | |
ccc9d90a | 791 | grant_ref_t gref; |
956a9202 | 792 | |
ccc9d90a | 793 | err = xenbus_grant_ring(pdev->xdev, pdev->sh_info, 1, &gref); |
956a9202 RW |
794 | if (err < 0) |
795 | goto out; | |
796 | ||
ccc9d90a | 797 | pdev->gnt_ref = gref; |
956a9202 RW |
798 | |
799 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); | |
800 | if (err) | |
801 | goto out; | |
802 | ||
803 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, | |
804 | 0, "pcifront", pdev); | |
805 | ||
806 | if (err < 0) | |
807 | return err; | |
808 | ||
809 | pdev->irq = err; | |
810 | ||
811 | do_publish: | |
812 | err = xenbus_transaction_start(&trans); | |
813 | if (err) { | |
814 | xenbus_dev_fatal(pdev->xdev, err, | |
815 | "Error writing configuration for backend " | |
816 | "(start transaction)"); | |
817 | goto out; | |
818 | } | |
819 | ||
820 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
821 | "pci-op-ref", "%u", pdev->gnt_ref); | |
822 | if (!err) | |
823 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
824 | "event-channel", "%u", pdev->evtchn); | |
825 | if (!err) | |
826 | err = xenbus_printf(trans, pdev->xdev->nodename, | |
827 | "magic", XEN_PCI_MAGIC); | |
828 | ||
829 | if (err) { | |
830 | xenbus_transaction_end(trans, 1); | |
831 | xenbus_dev_fatal(pdev->xdev, err, | |
832 | "Error writing configuration for backend"); | |
833 | goto out; | |
834 | } else { | |
835 | err = xenbus_transaction_end(trans, 0); | |
836 | if (err == -EAGAIN) | |
837 | goto do_publish; | |
838 | else if (err) { | |
839 | xenbus_dev_fatal(pdev->xdev, err, | |
840 | "Error completing transaction " | |
841 | "for backend"); | |
842 | goto out; | |
843 | } | |
844 | } | |
845 | ||
846 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | |
847 | ||
848 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); | |
849 | ||
850 | out: | |
851 | return err; | |
852 | } | |
853 | ||
15856ad5 | 854 | static int pcifront_try_connect(struct pcifront_device *pdev) |
956a9202 RW |
855 | { |
856 | int err = -EFAULT; | |
857 | int i, num_roots, len; | |
858 | char str[64]; | |
859 | unsigned int domain, bus; | |
860 | ||
861 | ||
862 | /* Only connect once */ | |
863 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
864 | XenbusStateInitialised) | |
865 | goto out; | |
866 | ||
3d925320 | 867 | err = pcifront_connect_and_init_dma(pdev); |
098b1aea | 868 | if (err && err != -EEXIST) { |
956a9202 | 869 | xenbus_dev_fatal(pdev->xdev, err, |
3d925320 | 870 | "Error setting up PCI Frontend"); |
956a9202 RW |
871 | goto out; |
872 | } | |
873 | ||
874 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
875 | "root_num", "%d", &num_roots); | |
876 | if (err == -ENOENT) { | |
877 | xenbus_dev_error(pdev->xdev, err, | |
878 | "No PCI Roots found, trying 0000:00"); | |
879 | err = pcifront_scan_root(pdev, 0, 0); | |
23cf1d00 CG |
880 | if (err) { |
881 | xenbus_dev_fatal(pdev->xdev, err, | |
882 | "Error scanning PCI root 0000:00"); | |
883 | goto out; | |
884 | } | |
956a9202 RW |
885 | num_roots = 0; |
886 | } else if (err != 1) { | |
887 | if (err == 0) | |
888 | err = -EINVAL; | |
889 | xenbus_dev_fatal(pdev->xdev, err, | |
890 | "Error reading number of PCI roots"); | |
891 | goto out; | |
892 | } | |
893 | ||
894 | for (i = 0; i < num_roots; i++) { | |
895 | len = snprintf(str, sizeof(str), "root-%d", i); | |
896 | if (unlikely(len >= (sizeof(str) - 1))) { | |
897 | err = -ENOMEM; | |
898 | goto out; | |
899 | } | |
900 | ||
901 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
902 | "%x:%x", &domain, &bus); | |
903 | if (err != 2) { | |
904 | if (err >= 0) | |
905 | err = -EINVAL; | |
906 | xenbus_dev_fatal(pdev->xdev, err, | |
907 | "Error reading PCI root %d", i); | |
908 | goto out; | |
909 | } | |
910 | ||
911 | err = pcifront_scan_root(pdev, domain, bus); | |
912 | if (err) { | |
913 | xenbus_dev_fatal(pdev->xdev, err, | |
914 | "Error scanning PCI root %04x:%02x", | |
915 | domain, bus); | |
916 | goto out; | |
917 | } | |
918 | } | |
919 | ||
920 | err = xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
921 | ||
922 | out: | |
923 | return err; | |
924 | } | |
925 | ||
926 | static int pcifront_try_disconnect(struct pcifront_device *pdev) | |
927 | { | |
928 | int err = 0; | |
929 | enum xenbus_state prev_state; | |
930 | ||
931 | ||
932 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); | |
933 | ||
934 | if (prev_state >= XenbusStateClosing) | |
935 | goto out; | |
936 | ||
937 | if (prev_state == XenbusStateConnected) { | |
938 | pcifront_free_roots(pdev); | |
939 | pcifront_disconnect(pdev); | |
940 | } | |
941 | ||
942 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); | |
943 | ||
944 | out: | |
945 | ||
946 | return err; | |
947 | } | |
948 | ||
15856ad5 | 949 | static int pcifront_attach_devices(struct pcifront_device *pdev) |
956a9202 RW |
950 | { |
951 | int err = -EFAULT; | |
952 | int i, num_roots, len; | |
953 | unsigned int domain, bus; | |
954 | char str[64]; | |
955 | ||
956 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
957 | XenbusStateReconfiguring) | |
958 | goto out; | |
959 | ||
960 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | |
961 | "root_num", "%d", &num_roots); | |
962 | if (err == -ENOENT) { | |
963 | xenbus_dev_error(pdev->xdev, err, | |
964 | "No PCI Roots found, trying 0000:00"); | |
965 | err = pcifront_rescan_root(pdev, 0, 0); | |
23cf1d00 CG |
966 | if (err) { |
967 | xenbus_dev_fatal(pdev->xdev, err, | |
968 | "Error scanning PCI root 0000:00"); | |
969 | goto out; | |
970 | } | |
956a9202 RW |
971 | num_roots = 0; |
972 | } else if (err != 1) { | |
973 | if (err == 0) | |
974 | err = -EINVAL; | |
975 | xenbus_dev_fatal(pdev->xdev, err, | |
976 | "Error reading number of PCI roots"); | |
977 | goto out; | |
978 | } | |
979 | ||
980 | for (i = 0; i < num_roots; i++) { | |
981 | len = snprintf(str, sizeof(str), "root-%d", i); | |
982 | if (unlikely(len >= (sizeof(str) - 1))) { | |
983 | err = -ENOMEM; | |
984 | goto out; | |
985 | } | |
986 | ||
987 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
988 | "%x:%x", &domain, &bus); | |
989 | if (err != 2) { | |
990 | if (err >= 0) | |
991 | err = -EINVAL; | |
992 | xenbus_dev_fatal(pdev->xdev, err, | |
993 | "Error reading PCI root %d", i); | |
994 | goto out; | |
995 | } | |
996 | ||
997 | err = pcifront_rescan_root(pdev, domain, bus); | |
998 | if (err) { | |
999 | xenbus_dev_fatal(pdev->xdev, err, | |
1000 | "Error scanning PCI root %04x:%02x", | |
1001 | domain, bus); | |
1002 | goto out; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
1007 | ||
1008 | out: | |
1009 | return err; | |
1010 | } | |
1011 | ||
1012 | static int pcifront_detach_devices(struct pcifront_device *pdev) | |
1013 | { | |
1014 | int err = 0; | |
1015 | int i, num_devs; | |
1016 | unsigned int domain, bus, slot, func; | |
956a9202 RW |
1017 | struct pci_dev *pci_dev; |
1018 | char str[64]; | |
1019 | ||
1020 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
1021 | XenbusStateConnected) | |
1022 | goto out; | |
1023 | ||
1024 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", | |
1025 | &num_devs); | |
1026 | if (err != 1) { | |
1027 | if (err >= 0) | |
1028 | err = -EINVAL; | |
1029 | xenbus_dev_fatal(pdev->xdev, err, | |
1030 | "Error reading number of PCI devices"); | |
1031 | goto out; | |
1032 | } | |
1033 | ||
1034 | /* Find devices being detached and remove them. */ | |
1035 | for (i = 0; i < num_devs; i++) { | |
1036 | int l, state; | |
1037 | l = snprintf(str, sizeof(str), "state-%d", i); | |
1038 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1039 | err = -ENOMEM; | |
1040 | goto out; | |
1041 | } | |
58faf07b JG |
1042 | state = xenbus_read_unsigned(pdev->xdev->otherend, str, |
1043 | XenbusStateUnknown); | |
956a9202 RW |
1044 | |
1045 | if (state != XenbusStateClosing) | |
1046 | continue; | |
1047 | ||
1048 | /* Remove device. */ | |
1049 | l = snprintf(str, sizeof(str), "vdev-%d", i); | |
1050 | if (unlikely(l >= (sizeof(str) - 1))) { | |
1051 | err = -ENOMEM; | |
1052 | goto out; | |
1053 | } | |
1054 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | |
1055 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | |
1056 | if (err != 4) { | |
1057 | if (err >= 0) | |
1058 | err = -EINVAL; | |
1059 | xenbus_dev_fatal(pdev->xdev, err, | |
1060 | "Error reading PCI device %d", i); | |
1061 | goto out; | |
1062 | } | |
1063 | ||
2ccc246d JL |
1064 | pci_dev = pci_get_domain_bus_and_slot(domain, bus, |
1065 | PCI_DEVFN(slot, func)); | |
956a9202 RW |
1066 | if (!pci_dev) { |
1067 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1068 | "Cannot get PCI device %04x:%02x:%02x.%d\n", |
956a9202 RW |
1069 | domain, bus, slot, func); |
1070 | continue; | |
1071 | } | |
a83919e0 | 1072 | pci_lock_rescan_remove(); |
210647af | 1073 | pci_stop_and_remove_bus_device(pci_dev); |
956a9202 | 1074 | pci_dev_put(pci_dev); |
a83919e0 | 1075 | pci_unlock_rescan_remove(); |
956a9202 RW |
1076 | |
1077 | dev_dbg(&pdev->xdev->dev, | |
e4de866a | 1078 | "PCI device %04x:%02x:%02x.%d removed.\n", |
956a9202 RW |
1079 | domain, bus, slot, func); |
1080 | } | |
1081 | ||
1082 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); | |
1083 | ||
1084 | out: | |
1085 | return err; | |
1086 | } | |
1087 | ||
bd721ea7 | 1088 | static void __ref pcifront_backend_changed(struct xenbus_device *xdev, |
956a9202 RW |
1089 | enum xenbus_state be_state) |
1090 | { | |
1091 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1092 | ||
1093 | switch (be_state) { | |
1094 | case XenbusStateUnknown: | |
1095 | case XenbusStateInitialising: | |
1096 | case XenbusStateInitWait: | |
1097 | case XenbusStateInitialised: | |
956a9202 RW |
1098 | break; |
1099 | ||
1100 | case XenbusStateConnected: | |
1101 | pcifront_try_connect(pdev); | |
1102 | break; | |
1103 | ||
d5af64de DV |
1104 | case XenbusStateClosed: |
1105 | if (xdev->state == XenbusStateClosed) | |
1106 | break; | |
1107 | /* Missed the backend's CLOSING state -- fallthrough */ | |
956a9202 RW |
1108 | case XenbusStateClosing: |
1109 | dev_warn(&xdev->dev, "backend going away!\n"); | |
1110 | pcifront_try_disconnect(pdev); | |
1111 | break; | |
1112 | ||
1113 | case XenbusStateReconfiguring: | |
1114 | pcifront_detach_devices(pdev); | |
1115 | break; | |
1116 | ||
1117 | case XenbusStateReconfigured: | |
1118 | pcifront_attach_devices(pdev); | |
1119 | break; | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, | |
1124 | const struct xenbus_device_id *id) | |
1125 | { | |
1126 | int err = 0; | |
1127 | struct pcifront_device *pdev = alloc_pdev(xdev); | |
1128 | ||
1129 | if (pdev == NULL) { | |
1130 | err = -ENOMEM; | |
1131 | xenbus_dev_fatal(xdev, err, | |
1132 | "Error allocating pcifront_device struct"); | |
1133 | goto out; | |
1134 | } | |
1135 | ||
1136 | err = pcifront_publish_info(pdev); | |
1137 | if (err) | |
1138 | free_pdev(pdev); | |
1139 | ||
1140 | out: | |
1141 | return err; | |
1142 | } | |
1143 | ||
1144 | static int pcifront_xenbus_remove(struct xenbus_device *xdev) | |
1145 | { | |
1146 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | |
1147 | if (pdev) | |
1148 | free_pdev(pdev); | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static const struct xenbus_device_id xenpci_ids[] = { | |
1154 | {"pci"}, | |
1155 | {""}, | |
1156 | }; | |
1157 | ||
95afae48 DV |
1158 | static struct xenbus_driver xenpci_driver = { |
1159 | .name = "pcifront", | |
1160 | .ids = xenpci_ids, | |
956a9202 RW |
1161 | .probe = pcifront_xenbus_probe, |
1162 | .remove = pcifront_xenbus_remove, | |
1163 | .otherend_changed = pcifront_backend_changed, | |
95afae48 | 1164 | }; |
956a9202 RW |
1165 | |
1166 | static int __init pcifront_init(void) | |
1167 | { | |
1168 | if (!xen_pv_domain() || xen_initial_domain()) | |
1169 | return -ENODEV; | |
1170 | ||
51c71a3b KRW |
1171 | if (!xen_has_pv_devices()) |
1172 | return -ENODEV; | |
1173 | ||
956a9202 RW |
1174 | pci_frontend_registrar(1 /* enable */); |
1175 | ||
73db144b | 1176 | return xenbus_register_frontend(&xenpci_driver); |
956a9202 RW |
1177 | } |
1178 | ||
1179 | static void __exit pcifront_cleanup(void) | |
1180 | { | |
73db144b | 1181 | xenbus_unregister_driver(&xenpci_driver); |
956a9202 RW |
1182 | pci_frontend_registrar(0 /* disable */); |
1183 | } | |
1184 | module_init(pcifront_init); | |
1185 | module_exit(pcifront_cleanup); | |
1186 | ||
1187 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); | |
1188 | MODULE_LICENSE("GPL"); | |
1189 | MODULE_ALIAS("xen:pci"); |