Commit | Line | Data |
---|---|---|
30edc14b KRW |
1 | /* |
2 | * PCI Backend Xenbus Setup - handles setup with frontend and xend | |
3 | * | |
4 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> | |
5 | */ | |
283c0972 JP |
6 | |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
8 | ||
59aa56bf | 9 | #include <linux/moduleparam.h> |
30edc14b KRW |
10 | #include <linux/init.h> |
11 | #include <linux/list.h> | |
12 | #include <linux/vmalloc.h> | |
13 | #include <linux/workqueue.h> | |
14 | #include <xen/xenbus.h> | |
15 | #include <xen/events.h> | |
6221a9b2 | 16 | #include <asm/xen/pci.h> |
30edc14b KRW |
17 | #include "pciback.h" |
18 | ||
19 | #define INVALID_EVTCHN_IRQ (-1) | |
30edc14b | 20 | |
90ab5ee9 | 21 | static bool __read_mostly passthrough; |
2ebdc426 KRW |
22 | module_param(passthrough, bool, S_IRUGO); |
23 | MODULE_PARM_DESC(passthrough, | |
24 | "Option to specify how to export PCI topology to guest:\n"\ | |
25 | " 0 - (default) Hide the true PCI topology and makes the frontend\n"\ | |
26 | " there is a single PCI bus with only the exported devices on it.\n"\ | |
27 | " For example, a device at 03:05.0 will be re-assigned to 00:00.0\n"\ | |
28 | " while second device at 02:1a.1 will be re-assigned to 00:01.1.\n"\ | |
29 | " 1 - Passthrough provides a real view of the PCI topology to the\n"\ | |
30 | " frontend (for example, a device at 06:01.b will still appear at\n"\ | |
31 | " 06:01.b to the frontend). This is similar to how Xen 2.0.x\n"\ | |
32 | " exposed PCI devices to its driver domains. This may be required\n"\ | |
33 | " for drivers which depend on finding their hardward in certain\n"\ | |
34 | " bus/slot locations."); | |
35 | ||
a92336a1 | 36 | static struct xen_pcibk_device *alloc_pdev(struct xenbus_device *xdev) |
30edc14b | 37 | { |
a92336a1 | 38 | struct xen_pcibk_device *pdev; |
30edc14b | 39 | |
a92336a1 | 40 | pdev = kzalloc(sizeof(struct xen_pcibk_device), GFP_KERNEL); |
30edc14b KRW |
41 | if (pdev == NULL) |
42 | goto out; | |
43 | dev_dbg(&xdev->dev, "allocated pdev @ 0x%p\n", pdev); | |
44 | ||
45 | pdev->xdev = xdev; | |
30edc14b | 46 | |
b1766b62 | 47 | mutex_init(&pdev->dev_lock); |
30edc14b KRW |
48 | |
49 | pdev->sh_info = NULL; | |
50 | pdev->evtchn_irq = INVALID_EVTCHN_IRQ; | |
51 | pdev->be_watching = 0; | |
52 | ||
a92336a1 | 53 | INIT_WORK(&pdev->op_work, xen_pcibk_do_op); |
30edc14b | 54 | |
a92336a1 | 55 | if (xen_pcibk_init_devices(pdev)) { |
30edc14b KRW |
56 | kfree(pdev); |
57 | pdev = NULL; | |
58 | } | |
584a561a DG |
59 | |
60 | dev_set_drvdata(&xdev->dev, pdev); | |
61 | ||
30edc14b KRW |
62 | out: |
63 | return pdev; | |
64 | } | |
65 | ||
a92336a1 | 66 | static void xen_pcibk_disconnect(struct xen_pcibk_device *pdev) |
30edc14b | 67 | { |
b1766b62 | 68 | mutex_lock(&pdev->dev_lock); |
30edc14b KRW |
69 | /* Ensure the guest can't trigger our handler before removing devices */ |
70 | if (pdev->evtchn_irq != INVALID_EVTCHN_IRQ) { | |
71 | unbind_from_irqhandler(pdev->evtchn_irq, pdev); | |
72 | pdev->evtchn_irq = INVALID_EVTCHN_IRQ; | |
73 | } | |
74 | ||
75 | /* If the driver domain started an op, make sure we complete it | |
76 | * before releasing the shared memory */ | |
494ef20d | 77 | |
429eafe6 | 78 | flush_work(&pdev->op_work); |
30edc14b KRW |
79 | |
80 | if (pdev->sh_info != NULL) { | |
81 | xenbus_unmap_ring_vfree(pdev->xdev, pdev->sh_info); | |
82 | pdev->sh_info = NULL; | |
83 | } | |
b1766b62 | 84 | mutex_unlock(&pdev->dev_lock); |
30edc14b KRW |
85 | } |
86 | ||
a92336a1 | 87 | static void free_pdev(struct xen_pcibk_device *pdev) |
30edc14b | 88 | { |
494ef20d | 89 | if (pdev->be_watching) { |
30edc14b | 90 | unregister_xenbus_watch(&pdev->be_watch); |
494ef20d KRW |
91 | pdev->be_watching = 0; |
92 | } | |
30edc14b | 93 | |
a92336a1 | 94 | xen_pcibk_disconnect(pdev); |
30edc14b | 95 | |
8be9df6d KRW |
96 | /* N.B. This calls pcistub_put_pci_dev which does the FLR on all |
97 | * of the PCIe devices. */ | |
a92336a1 | 98 | xen_pcibk_release_devices(pdev); |
30edc14b KRW |
99 | |
100 | dev_set_drvdata(&pdev->xdev->dev, NULL); | |
101 | pdev->xdev = NULL; | |
102 | ||
103 | kfree(pdev); | |
104 | } | |
105 | ||
a92336a1 | 106 | static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref, |
30edc14b KRW |
107 | int remote_evtchn) |
108 | { | |
109 | int err = 0; | |
110 | void *vaddr; | |
111 | ||
112 | dev_dbg(&pdev->xdev->dev, | |
113 | "Attaching to frontend resources - gnt_ref=%d evtchn=%d\n", | |
114 | gnt_ref, remote_evtchn); | |
115 | ||
ccc9d90a | 116 | err = xenbus_map_ring_valloc(pdev->xdev, &gnt_ref, 1, &vaddr); |
30edc14b KRW |
117 | if (err < 0) { |
118 | xenbus_dev_fatal(pdev->xdev, err, | |
119 | "Error mapping other domain page in ours."); | |
120 | goto out; | |
121 | } | |
494ef20d | 122 | |
30edc14b KRW |
123 | pdev->sh_info = vaddr; |
124 | ||
125 | err = bind_interdomain_evtchn_to_irqhandler( | |
a92336a1 KRW |
126 | pdev->xdev->otherend_id, remote_evtchn, xen_pcibk_handle_event, |
127 | 0, DRV_NAME, pdev); | |
30edc14b KRW |
128 | if (err < 0) { |
129 | xenbus_dev_fatal(pdev->xdev, err, | |
130 | "Error binding event channel to IRQ"); | |
131 | goto out; | |
132 | } | |
133 | pdev->evtchn_irq = err; | |
134 | err = 0; | |
135 | ||
136 | dev_dbg(&pdev->xdev->dev, "Attached!\n"); | |
137 | out: | |
138 | return err; | |
139 | } | |
140 | ||
a92336a1 | 141 | static int xen_pcibk_attach(struct xen_pcibk_device *pdev) |
30edc14b KRW |
142 | { |
143 | int err = 0; | |
144 | int gnt_ref, remote_evtchn; | |
145 | char *magic = NULL; | |
146 | ||
30edc14b | 147 | |
b1766b62 | 148 | mutex_lock(&pdev->dev_lock); |
30edc14b KRW |
149 | /* Make sure we only do this setup once */ |
150 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
151 | XenbusStateInitialised) | |
152 | goto out; | |
153 | ||
154 | /* Wait for frontend to state that it has published the configuration */ | |
155 | if (xenbus_read_driver_state(pdev->xdev->otherend) != | |
156 | XenbusStateInitialised) | |
157 | goto out; | |
158 | ||
159 | dev_dbg(&pdev->xdev->dev, "Reading frontend config\n"); | |
160 | ||
161 | err = xenbus_gather(XBT_NIL, pdev->xdev->otherend, | |
162 | "pci-op-ref", "%u", &gnt_ref, | |
163 | "event-channel", "%u", &remote_evtchn, | |
164 | "magic", NULL, &magic, NULL); | |
165 | if (err) { | |
166 | /* If configuration didn't get read correctly, wait longer */ | |
167 | xenbus_dev_fatal(pdev->xdev, err, | |
168 | "Error reading configuration from frontend"); | |
169 | goto out; | |
170 | } | |
171 | ||
172 | if (magic == NULL || strcmp(magic, XEN_PCI_MAGIC) != 0) { | |
173 | xenbus_dev_fatal(pdev->xdev, -EFAULT, | |
174 | "version mismatch (%s/%s) with pcifront - " | |
402c5e15 | 175 | "halting " DRV_NAME, |
30edc14b | 176 | magic, XEN_PCI_MAGIC); |
2ef76032 | 177 | err = -EFAULT; |
30edc14b KRW |
178 | goto out; |
179 | } | |
180 | ||
a92336a1 | 181 | err = xen_pcibk_do_attach(pdev, gnt_ref, remote_evtchn); |
30edc14b KRW |
182 | if (err) |
183 | goto out; | |
184 | ||
185 | dev_dbg(&pdev->xdev->dev, "Connecting...\n"); | |
186 | ||
187 | err = xenbus_switch_state(pdev->xdev, XenbusStateConnected); | |
188 | if (err) | |
189 | xenbus_dev_fatal(pdev->xdev, err, | |
190 | "Error switching to connected state!"); | |
191 | ||
192 | dev_dbg(&pdev->xdev->dev, "Connected? %d\n", err); | |
193 | out: | |
b1766b62 | 194 | mutex_unlock(&pdev->dev_lock); |
30edc14b KRW |
195 | |
196 | kfree(magic); | |
197 | ||
198 | return err; | |
199 | } | |
200 | ||
a92336a1 | 201 | static int xen_pcibk_publish_pci_dev(struct xen_pcibk_device *pdev, |
30edc14b KRW |
202 | unsigned int domain, unsigned int bus, |
203 | unsigned int devfn, unsigned int devid) | |
204 | { | |
205 | int err; | |
206 | int len; | |
207 | char str[64]; | |
208 | ||
209 | len = snprintf(str, sizeof(str), "vdev-%d", devid); | |
210 | if (unlikely(len >= (sizeof(str) - 1))) { | |
211 | err = -ENOMEM; | |
212 | goto out; | |
213 | } | |
214 | ||
e4de866a | 215 | /* Note: The PV protocol uses %02x, don't change it */ |
30edc14b KRW |
216 | err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, str, |
217 | "%04x:%02x:%02x.%02x", domain, bus, | |
218 | PCI_SLOT(devfn), PCI_FUNC(devfn)); | |
219 | ||
220 | out: | |
221 | return err; | |
222 | } | |
223 | ||
a92336a1 | 224 | static int xen_pcibk_export_device(struct xen_pcibk_device *pdev, |
30edc14b KRW |
225 | int domain, int bus, int slot, int func, |
226 | int devid) | |
227 | { | |
228 | struct pci_dev *dev; | |
229 | int err = 0; | |
230 | ||
231 | dev_dbg(&pdev->xdev->dev, "exporting dom %x bus %x slot %x func %x\n", | |
232 | domain, bus, slot, func); | |
233 | ||
234 | dev = pcistub_get_pci_dev_by_slot(pdev, domain, bus, slot, func); | |
235 | if (!dev) { | |
236 | err = -EINVAL; | |
237 | xenbus_dev_fatal(pdev->xdev, err, | |
238 | "Couldn't locate PCI device " | |
e4de866a | 239 | "(%04x:%02x:%02x.%d)! " |
30edc14b KRW |
240 | "perhaps already in-use?", |
241 | domain, bus, slot, func); | |
242 | goto out; | |
243 | } | |
244 | ||
a92336a1 KRW |
245 | err = xen_pcibk_add_pci_dev(pdev, dev, devid, |
246 | xen_pcibk_publish_pci_dev); | |
30edc14b KRW |
247 | if (err) |
248 | goto out; | |
249 | ||
15390613 | 250 | dev_info(&dev->dev, "registering for %d\n", pdev->xdev->otherend_id); |
6221a9b2 KRW |
251 | if (xen_register_device_domain_owner(dev, |
252 | pdev->xdev->otherend_id) != 0) { | |
6c254de1 KRW |
253 | dev_err(&dev->dev, "Stealing ownership from dom%d.\n", |
254 | xen_find_device_domain_owner(dev)); | |
6221a9b2 KRW |
255 | xen_unregister_device_domain_owner(dev); |
256 | xen_register_device_domain_owner(dev, pdev->xdev->otherend_id); | |
257 | } | |
258 | ||
30edc14b KRW |
259 | /* TODO: It'd be nice to export a bridge and have all of its children |
260 | * get exported with it. This may be best done in xend (which will | |
261 | * have to calculate resource usage anyway) but we probably want to | |
262 | * put something in here to ensure that if a bridge gets given to a | |
263 | * driver domain, that all devices under that bridge are not given | |
264 | * to other driver domains (as he who controls the bridge can disable | |
265 | * it and stop the other devices from working). | |
266 | */ | |
267 | out: | |
268 | return err; | |
269 | } | |
270 | ||
a92336a1 | 271 | static int xen_pcibk_remove_device(struct xen_pcibk_device *pdev, |
30edc14b KRW |
272 | int domain, int bus, int slot, int func) |
273 | { | |
274 | int err = 0; | |
275 | struct pci_dev *dev; | |
276 | ||
277 | dev_dbg(&pdev->xdev->dev, "removing dom %x bus %x slot %x func %x\n", | |
278 | domain, bus, slot, func); | |
279 | ||
a92336a1 | 280 | dev = xen_pcibk_get_pci_dev(pdev, domain, bus, PCI_DEVFN(slot, func)); |
30edc14b KRW |
281 | if (!dev) { |
282 | err = -EINVAL; | |
283 | dev_dbg(&pdev->xdev->dev, "Couldn't locate PCI device " | |
e4de866a | 284 | "(%04x:%02x:%02x.%d)! not owned by this domain\n", |
30edc14b KRW |
285 | domain, bus, slot, func); |
286 | goto out; | |
287 | } | |
288 | ||
6221a9b2 KRW |
289 | dev_dbg(&dev->dev, "unregistering for %d\n", pdev->xdev->otherend_id); |
290 | xen_unregister_device_domain_owner(dev); | |
291 | ||
8be9df6d KRW |
292 | /* N.B. This ends up calling pcistub_put_pci_dev which ends up |
293 | * doing the FLR. */ | |
e8801a74 | 294 | xen_pcibk_release_pci_dev(pdev, dev, true /* use the lock. */); |
30edc14b KRW |
295 | |
296 | out: | |
297 | return err; | |
298 | } | |
299 | ||
a92336a1 | 300 | static int xen_pcibk_publish_pci_root(struct xen_pcibk_device *pdev, |
30edc14b KRW |
301 | unsigned int domain, unsigned int bus) |
302 | { | |
303 | unsigned int d, b; | |
304 | int i, root_num, len, err; | |
305 | char str[64]; | |
306 | ||
307 | dev_dbg(&pdev->xdev->dev, "Publishing pci roots\n"); | |
308 | ||
309 | err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, | |
310 | "root_num", "%d", &root_num); | |
311 | if (err == 0 || err == -ENOENT) | |
312 | root_num = 0; | |
313 | else if (err < 0) | |
314 | goto out; | |
315 | ||
316 | /* Verify that we haven't already published this pci root */ | |
317 | for (i = 0; i < root_num; i++) { | |
318 | len = snprintf(str, sizeof(str), "root-%d", i); | |
319 | if (unlikely(len >= (sizeof(str) - 1))) { | |
320 | err = -ENOMEM; | |
321 | goto out; | |
322 | } | |
323 | ||
324 | err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, | |
325 | str, "%x:%x", &d, &b); | |
326 | if (err < 0) | |
327 | goto out; | |
328 | if (err != 2) { | |
329 | err = -EINVAL; | |
330 | goto out; | |
331 | } | |
332 | ||
333 | if (d == domain && b == bus) { | |
334 | err = 0; | |
335 | goto out; | |
336 | } | |
337 | } | |
338 | ||
339 | len = snprintf(str, sizeof(str), "root-%d", root_num); | |
340 | if (unlikely(len >= (sizeof(str) - 1))) { | |
341 | err = -ENOMEM; | |
342 | goto out; | |
343 | } | |
344 | ||
345 | dev_dbg(&pdev->xdev->dev, "writing root %d at %04x:%02x\n", | |
346 | root_num, domain, bus); | |
347 | ||
348 | err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, str, | |
349 | "%04x:%02x", domain, bus); | |
350 | if (err) | |
351 | goto out; | |
352 | ||
353 | err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, | |
354 | "root_num", "%d", (root_num + 1)); | |
355 | ||
356 | out: | |
357 | return err; | |
358 | } | |
359 | ||
a92336a1 | 360 | static int xen_pcibk_reconfigure(struct xen_pcibk_device *pdev) |
30edc14b KRW |
361 | { |
362 | int err = 0; | |
363 | int num_devs; | |
364 | int domain, bus, slot, func; | |
365 | int substate; | |
366 | int i, len; | |
367 | char state_str[64]; | |
368 | char dev_str[64]; | |
369 | ||
30edc14b KRW |
370 | |
371 | dev_dbg(&pdev->xdev->dev, "Reconfiguring device ...\n"); | |
372 | ||
b1766b62 | 373 | mutex_lock(&pdev->dev_lock); |
30edc14b KRW |
374 | /* Make sure we only reconfigure once */ |
375 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
376 | XenbusStateReconfiguring) | |
377 | goto out; | |
378 | ||
379 | err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, "num_devs", "%d", | |
380 | &num_devs); | |
381 | if (err != 1) { | |
382 | if (err >= 0) | |
383 | err = -EINVAL; | |
384 | xenbus_dev_fatal(pdev->xdev, err, | |
385 | "Error reading number of devices"); | |
386 | goto out; | |
387 | } | |
388 | ||
389 | for (i = 0; i < num_devs; i++) { | |
390 | len = snprintf(state_str, sizeof(state_str), "state-%d", i); | |
391 | if (unlikely(len >= (sizeof(state_str) - 1))) { | |
392 | err = -ENOMEM; | |
393 | xenbus_dev_fatal(pdev->xdev, err, | |
394 | "String overflow while reading " | |
395 | "configuration"); | |
396 | goto out; | |
397 | } | |
398 | err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, state_str, | |
399 | "%d", &substate); | |
400 | if (err != 1) | |
401 | substate = XenbusStateUnknown; | |
402 | ||
403 | switch (substate) { | |
404 | case XenbusStateInitialising: | |
405 | dev_dbg(&pdev->xdev->dev, "Attaching dev-%d ...\n", i); | |
406 | ||
407 | len = snprintf(dev_str, sizeof(dev_str), "dev-%d", i); | |
408 | if (unlikely(len >= (sizeof(dev_str) - 1))) { | |
409 | err = -ENOMEM; | |
410 | xenbus_dev_fatal(pdev->xdev, err, | |
411 | "String overflow while " | |
412 | "reading configuration"); | |
413 | goto out; | |
414 | } | |
415 | err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, | |
416 | dev_str, "%x:%x:%x.%x", | |
417 | &domain, &bus, &slot, &func); | |
418 | if (err < 0) { | |
419 | xenbus_dev_fatal(pdev->xdev, err, | |
420 | "Error reading device " | |
421 | "configuration"); | |
422 | goto out; | |
423 | } | |
424 | if (err != 4) { | |
425 | err = -EINVAL; | |
426 | xenbus_dev_fatal(pdev->xdev, err, | |
427 | "Error parsing pci device " | |
428 | "configuration"); | |
429 | goto out; | |
430 | } | |
431 | ||
a92336a1 | 432 | err = xen_pcibk_export_device(pdev, domain, bus, slot, |
30edc14b KRW |
433 | func, i); |
434 | if (err) | |
435 | goto out; | |
436 | ||
437 | /* Publish pci roots. */ | |
a92336a1 KRW |
438 | err = xen_pcibk_publish_pci_roots(pdev, |
439 | xen_pcibk_publish_pci_root); | |
30edc14b KRW |
440 | if (err) { |
441 | xenbus_dev_fatal(pdev->xdev, err, | |
442 | "Error while publish PCI root" | |
443 | "buses for frontend"); | |
444 | goto out; | |
445 | } | |
446 | ||
447 | err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, | |
448 | state_str, "%d", | |
449 | XenbusStateInitialised); | |
450 | if (err) { | |
451 | xenbus_dev_fatal(pdev->xdev, err, | |
452 | "Error switching substate of " | |
453 | "dev-%d\n", i); | |
454 | goto out; | |
455 | } | |
456 | break; | |
457 | ||
458 | case XenbusStateClosing: | |
459 | dev_dbg(&pdev->xdev->dev, "Detaching dev-%d ...\n", i); | |
460 | ||
461 | len = snprintf(dev_str, sizeof(dev_str), "vdev-%d", i); | |
462 | if (unlikely(len >= (sizeof(dev_str) - 1))) { | |
463 | err = -ENOMEM; | |
464 | xenbus_dev_fatal(pdev->xdev, err, | |
465 | "String overflow while " | |
466 | "reading configuration"); | |
467 | goto out; | |
468 | } | |
469 | err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, | |
470 | dev_str, "%x:%x:%x.%x", | |
471 | &domain, &bus, &slot, &func); | |
472 | if (err < 0) { | |
473 | xenbus_dev_fatal(pdev->xdev, err, | |
474 | "Error reading device " | |
475 | "configuration"); | |
476 | goto out; | |
477 | } | |
478 | if (err != 4) { | |
479 | err = -EINVAL; | |
480 | xenbus_dev_fatal(pdev->xdev, err, | |
481 | "Error parsing pci device " | |
482 | "configuration"); | |
483 | goto out; | |
484 | } | |
485 | ||
a92336a1 | 486 | err = xen_pcibk_remove_device(pdev, domain, bus, slot, |
30edc14b KRW |
487 | func); |
488 | if (err) | |
489 | goto out; | |
490 | ||
491 | /* TODO: If at some point we implement support for pci | |
492 | * root hot-remove on pcifront side, we'll need to | |
493 | * remove unnecessary xenstore nodes of pci roots here. | |
494 | */ | |
495 | ||
496 | break; | |
497 | ||
498 | default: | |
499 | break; | |
500 | } | |
501 | } | |
502 | ||
503 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfigured); | |
504 | if (err) { | |
505 | xenbus_dev_fatal(pdev->xdev, err, | |
506 | "Error switching to reconfigured state!"); | |
507 | goto out; | |
508 | } | |
509 | ||
510 | out: | |
b1766b62 | 511 | mutex_unlock(&pdev->dev_lock); |
30edc14b KRW |
512 | return 0; |
513 | } | |
514 | ||
a92336a1 | 515 | static void xen_pcibk_frontend_changed(struct xenbus_device *xdev, |
30edc14b KRW |
516 | enum xenbus_state fe_state) |
517 | { | |
a92336a1 | 518 | struct xen_pcibk_device *pdev = dev_get_drvdata(&xdev->dev); |
30edc14b KRW |
519 | |
520 | dev_dbg(&xdev->dev, "fe state changed %d\n", fe_state); | |
521 | ||
522 | switch (fe_state) { | |
523 | case XenbusStateInitialised: | |
a92336a1 | 524 | xen_pcibk_attach(pdev); |
30edc14b KRW |
525 | break; |
526 | ||
527 | case XenbusStateReconfiguring: | |
a92336a1 | 528 | xen_pcibk_reconfigure(pdev); |
30edc14b KRW |
529 | break; |
530 | ||
531 | case XenbusStateConnected: | |
532 | /* pcifront switched its state from reconfiguring to connected. | |
533 | * Then switch to connected state. | |
534 | */ | |
535 | xenbus_switch_state(xdev, XenbusStateConnected); | |
536 | break; | |
537 | ||
538 | case XenbusStateClosing: | |
a92336a1 | 539 | xen_pcibk_disconnect(pdev); |
30edc14b KRW |
540 | xenbus_switch_state(xdev, XenbusStateClosing); |
541 | break; | |
542 | ||
543 | case XenbusStateClosed: | |
a92336a1 | 544 | xen_pcibk_disconnect(pdev); |
30edc14b KRW |
545 | xenbus_switch_state(xdev, XenbusStateClosed); |
546 | if (xenbus_dev_is_online(xdev)) | |
547 | break; | |
548 | /* fall through if not online */ | |
549 | case XenbusStateUnknown: | |
550 | dev_dbg(&xdev->dev, "frontend is gone! unregister device\n"); | |
551 | device_unregister(&xdev->dev); | |
552 | break; | |
553 | ||
554 | default: | |
555 | break; | |
556 | } | |
557 | } | |
558 | ||
a92336a1 | 559 | static int xen_pcibk_setup_backend(struct xen_pcibk_device *pdev) |
30edc14b KRW |
560 | { |
561 | /* Get configuration from xend (if available now) */ | |
562 | int domain, bus, slot, func; | |
563 | int err = 0; | |
564 | int i, num_devs; | |
565 | char dev_str[64]; | |
566 | char state_str[64]; | |
567 | ||
b1766b62 | 568 | mutex_lock(&pdev->dev_lock); |
30edc14b KRW |
569 | /* It's possible we could get the call to setup twice, so make sure |
570 | * we're not already connected. | |
571 | */ | |
572 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | |
573 | XenbusStateInitWait) | |
574 | goto out; | |
575 | ||
576 | dev_dbg(&pdev->xdev->dev, "getting be setup\n"); | |
577 | ||
578 | err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, "num_devs", "%d", | |
579 | &num_devs); | |
580 | if (err != 1) { | |
581 | if (err >= 0) | |
582 | err = -EINVAL; | |
583 | xenbus_dev_fatal(pdev->xdev, err, | |
584 | "Error reading number of devices"); | |
585 | goto out; | |
586 | } | |
587 | ||
588 | for (i = 0; i < num_devs; i++) { | |
589 | int l = snprintf(dev_str, sizeof(dev_str), "dev-%d", i); | |
590 | if (unlikely(l >= (sizeof(dev_str) - 1))) { | |
591 | err = -ENOMEM; | |
592 | xenbus_dev_fatal(pdev->xdev, err, | |
593 | "String overflow while reading " | |
594 | "configuration"); | |
595 | goto out; | |
596 | } | |
597 | ||
598 | err = xenbus_scanf(XBT_NIL, pdev->xdev->nodename, dev_str, | |
599 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | |
600 | if (err < 0) { | |
601 | xenbus_dev_fatal(pdev->xdev, err, | |
602 | "Error reading device configuration"); | |
603 | goto out; | |
604 | } | |
605 | if (err != 4) { | |
606 | err = -EINVAL; | |
607 | xenbus_dev_fatal(pdev->xdev, err, | |
608 | "Error parsing pci device " | |
609 | "configuration"); | |
610 | goto out; | |
611 | } | |
612 | ||
a92336a1 | 613 | err = xen_pcibk_export_device(pdev, domain, bus, slot, func, i); |
30edc14b KRW |
614 | if (err) |
615 | goto out; | |
616 | ||
617 | /* Switch substate of this device. */ | |
618 | l = snprintf(state_str, sizeof(state_str), "state-%d", i); | |
619 | if (unlikely(l >= (sizeof(state_str) - 1))) { | |
620 | err = -ENOMEM; | |
621 | xenbus_dev_fatal(pdev->xdev, err, | |
622 | "String overflow while reading " | |
623 | "configuration"); | |
624 | goto out; | |
625 | } | |
626 | err = xenbus_printf(XBT_NIL, pdev->xdev->nodename, state_str, | |
627 | "%d", XenbusStateInitialised); | |
628 | if (err) { | |
629 | xenbus_dev_fatal(pdev->xdev, err, "Error switching " | |
630 | "substate of dev-%d\n", i); | |
631 | goto out; | |
632 | } | |
633 | } | |
634 | ||
a92336a1 | 635 | err = xen_pcibk_publish_pci_roots(pdev, xen_pcibk_publish_pci_root); |
30edc14b KRW |
636 | if (err) { |
637 | xenbus_dev_fatal(pdev->xdev, err, | |
638 | "Error while publish PCI root buses " | |
639 | "for frontend"); | |
640 | goto out; | |
641 | } | |
642 | ||
643 | err = xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | |
644 | if (err) | |
645 | xenbus_dev_fatal(pdev->xdev, err, | |
646 | "Error switching to initialised state!"); | |
647 | ||
648 | out: | |
b1766b62 | 649 | mutex_unlock(&pdev->dev_lock); |
30edc14b KRW |
650 | if (!err) |
651 | /* see if pcifront is already configured (if not, we'll wait) */ | |
a92336a1 | 652 | xen_pcibk_attach(pdev); |
30edc14b KRW |
653 | return err; |
654 | } | |
655 | ||
a92336a1 | 656 | static void xen_pcibk_be_watch(struct xenbus_watch *watch, |
30edc14b KRW |
657 | const char **vec, unsigned int len) |
658 | { | |
a92336a1 KRW |
659 | struct xen_pcibk_device *pdev = |
660 | container_of(watch, struct xen_pcibk_device, be_watch); | |
30edc14b KRW |
661 | |
662 | switch (xenbus_read_driver_state(pdev->xdev->nodename)) { | |
663 | case XenbusStateInitWait: | |
a92336a1 | 664 | xen_pcibk_setup_backend(pdev); |
30edc14b KRW |
665 | break; |
666 | ||
667 | default: | |
668 | break; | |
669 | } | |
670 | } | |
671 | ||
a92336a1 | 672 | static int xen_pcibk_xenbus_probe(struct xenbus_device *dev, |
30edc14b KRW |
673 | const struct xenbus_device_id *id) |
674 | { | |
675 | int err = 0; | |
a92336a1 | 676 | struct xen_pcibk_device *pdev = alloc_pdev(dev); |
30edc14b KRW |
677 | |
678 | if (pdev == NULL) { | |
679 | err = -ENOMEM; | |
680 | xenbus_dev_fatal(dev, err, | |
a92336a1 | 681 | "Error allocating xen_pcibk_device struct"); |
30edc14b KRW |
682 | goto out; |
683 | } | |
684 | ||
685 | /* wait for xend to configure us */ | |
686 | err = xenbus_switch_state(dev, XenbusStateInitWait); | |
687 | if (err) | |
688 | goto out; | |
689 | ||
690 | /* watch the backend node for backend configuration information */ | |
691 | err = xenbus_watch_path(dev, dev->nodename, &pdev->be_watch, | |
a92336a1 | 692 | xen_pcibk_be_watch); |
30edc14b KRW |
693 | if (err) |
694 | goto out; | |
494ef20d | 695 | |
30edc14b KRW |
696 | pdev->be_watching = 1; |
697 | ||
698 | /* We need to force a call to our callback here in case | |
699 | * xend already configured us! | |
700 | */ | |
a92336a1 | 701 | xen_pcibk_be_watch(&pdev->be_watch, NULL, 0); |
30edc14b KRW |
702 | |
703 | out: | |
704 | return err; | |
705 | } | |
706 | ||
a92336a1 | 707 | static int xen_pcibk_xenbus_remove(struct xenbus_device *dev) |
30edc14b | 708 | { |
a92336a1 | 709 | struct xen_pcibk_device *pdev = dev_get_drvdata(&dev->dev); |
30edc14b KRW |
710 | |
711 | if (pdev != NULL) | |
712 | free_pdev(pdev); | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
73db144b | 717 | static const struct xenbus_device_id xen_pcibk_ids[] = { |
30edc14b KRW |
718 | {"pci"}, |
719 | {""}, | |
720 | }; | |
721 | ||
95afae48 DV |
722 | static struct xenbus_driver xen_pcibk_driver = { |
723 | .name = DRV_NAME, | |
724 | .ids = xen_pcibk_ids, | |
a92336a1 KRW |
725 | .probe = xen_pcibk_xenbus_probe, |
726 | .remove = xen_pcibk_xenbus_remove, | |
727 | .otherend_changed = xen_pcibk_frontend_changed, | |
95afae48 | 728 | }; |
30edc14b | 729 | |
402c5e15 | 730 | const struct xen_pcibk_backend *__read_mostly xen_pcibk_backend; |
2ebdc426 | 731 | |
a92336a1 | 732 | int __init xen_pcibk_xenbus_register(void) |
30edc14b | 733 | { |
2ebdc426 KRW |
734 | xen_pcibk_backend = &xen_pcibk_vpci_backend; |
735 | if (passthrough) | |
736 | xen_pcibk_backend = &xen_pcibk_passthrough_backend; | |
283c0972 | 737 | pr_info("backend is %s\n", xen_pcibk_backend->name); |
73db144b | 738 | return xenbus_register_backend(&xen_pcibk_driver); |
30edc14b KRW |
739 | } |
740 | ||
a92336a1 | 741 | void __exit xen_pcibk_xenbus_unregister(void) |
30edc14b | 742 | { |
73db144b | 743 | xenbus_unregister_driver(&xen_pcibk_driver); |
30edc14b | 744 | } |