diff options
-rw-r--r-- | drivers/pci/Kconfig | 21 | ||||
-rw-r--r-- | drivers/pci/Makefile | 2 | ||||
-rw-r--r-- | drivers/pci/xen-pcifront.c | 1148 | ||||
-rw-r--r-- | include/xen/interface/io/pciif.h | 112 |
4 files changed, 1283 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 34ef70d562b2..5b1630e4e9e3 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig | |||
@@ -40,6 +40,27 @@ config PCI_STUB | |||
40 | 40 | ||
41 | When in doubt, say N. | 41 | When in doubt, say N. |
42 | 42 | ||
43 | config XEN_PCIDEV_FRONTEND | ||
44 | tristate "Xen PCI Frontend" | ||
45 | depends on PCI && X86 && XEN | ||
46 | select HOTPLUG | ||
47 | select PCI_XEN | ||
48 | default y | ||
49 | help | ||
50 | The PCI device frontend driver allows the kernel to import arbitrary | ||
51 | PCI devices from a PCI backend to support PCI driver domains. | ||
52 | |||
53 | config XEN_PCIDEV_FE_DEBUG | ||
54 | bool "Xen PCI Frontend debugging" | ||
55 | depends on XEN_PCIDEV_FRONTEND && PCI_DEBUG | ||
56 | help | ||
57 | Say Y here if you want the Xen PCI frontend to produce a bunch of debug | ||
58 | messages to the system log. Select this if you are having a | ||
59 | problem with Xen PCI frontend support and want to see more of what is | ||
60 | going on. | ||
61 | |||
62 | When in doubt, say N. | ||
63 | |||
43 | config HT_IRQ | 64 | config HT_IRQ |
44 | bool "Interrupts on hypertransport devices" | 65 | bool "Interrupts on hypertransport devices" |
45 | default y | 66 | default y |
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index dc1aa0922868..d5e27050c4e3 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile | |||
@@ -65,6 +65,8 @@ obj-$(CONFIG_PCI_SYSCALL) += syscall.o | |||
65 | 65 | ||
66 | obj-$(CONFIG_PCI_STUB) += pci-stub.o | 66 | obj-$(CONFIG_PCI_STUB) += pci-stub.o |
67 | 67 | ||
68 | obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += xen-pcifront.o | ||
69 | |||
68 | ifeq ($(CONFIG_PCI_DEBUG),y) | 70 | ifeq ($(CONFIG_PCI_DEBUG),y) |
69 | EXTRA_CFLAGS += -DDEBUG | 71 | EXTRA_CFLAGS += -DDEBUG |
70 | endif | 72 | endif |
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c new file mode 100644 index 000000000000..a87c4985326e --- /dev/null +++ b/drivers/pci/xen-pcifront.c | |||
@@ -0,0 +1,1148 @@ | |||
1 | /* | ||
2 | * Xen PCI Frontend. | ||
3 | * | ||
4 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> | ||
5 | */ | ||
6 | #include <linux/module.h> | ||
7 | #include <linux/init.h> | ||
8 | #include <linux/mm.h> | ||
9 | #include <xen/xenbus.h> | ||
10 | #include <xen/events.h> | ||
11 | #include <xen/grant_table.h> | ||
12 | #include <xen/page.h> | ||
13 | #include <linux/spinlock.h> | ||
14 | #include <linux/pci.h> | ||
15 | #include <linux/msi.h> | ||
16 | #include <xen/xenbus.h> | ||
17 | #include <xen/interface/io/pciif.h> | ||
18 | #include <asm/xen/pci.h> | ||
19 | #include <linux/interrupt.h> | ||
20 | #include <asm/atomic.h> | ||
21 | #include <linux/workqueue.h> | ||
22 | #include <linux/bitops.h> | ||
23 | #include <linux/time.h> | ||
24 | |||
25 | #define INVALID_GRANT_REF (0) | ||
26 | #define INVALID_EVTCHN (-1) | ||
27 | |||
28 | struct pci_bus_entry { | ||
29 | struct list_head list; | ||
30 | struct pci_bus *bus; | ||
31 | }; | ||
32 | |||
33 | #define _PDEVB_op_active (0) | ||
34 | #define PDEVB_op_active (1 << (_PDEVB_op_active)) | ||
35 | |||
36 | struct pcifront_device { | ||
37 | struct xenbus_device *xdev; | ||
38 | struct list_head root_buses; | ||
39 | |||
40 | int evtchn; | ||
41 | int gnt_ref; | ||
42 | |||
43 | int irq; | ||
44 | |||
45 | /* Lock this when doing any operations in sh_info */ | ||
46 | spinlock_t sh_info_lock; | ||
47 | struct xen_pci_sharedinfo *sh_info; | ||
48 | struct work_struct op_work; | ||
49 | unsigned long flags; | ||
50 | |||
51 | }; | ||
52 | |||
53 | struct pcifront_sd { | ||
54 | int domain; | ||
55 | struct pcifront_device *pdev; | ||
56 | }; | ||
57 | |||
58 | static inline struct pcifront_device * | ||
59 | pcifront_get_pdev(struct pcifront_sd *sd) | ||
60 | { | ||
61 | return sd->pdev; | ||
62 | } | ||
63 | |||
64 | static inline void pcifront_init_sd(struct pcifront_sd *sd, | ||
65 | unsigned int domain, unsigned int bus, | ||
66 | struct pcifront_device *pdev) | ||
67 | { | ||
68 | sd->domain = domain; | ||
69 | sd->pdev = pdev; | ||
70 | } | ||
71 | |||
72 | static DEFINE_SPINLOCK(pcifront_dev_lock); | ||
73 | static struct pcifront_device *pcifront_dev; | ||
74 | |||
75 | static int verbose_request; | ||
76 | module_param(verbose_request, int, 0644); | ||
77 | |||
78 | static int errno_to_pcibios_err(int errno) | ||
79 | { | ||
80 | switch (errno) { | ||
81 | case XEN_PCI_ERR_success: | ||
82 | return PCIBIOS_SUCCESSFUL; | ||
83 | |||
84 | case XEN_PCI_ERR_dev_not_found: | ||
85 | return PCIBIOS_DEVICE_NOT_FOUND; | ||
86 | |||
87 | case XEN_PCI_ERR_invalid_offset: | ||
88 | case XEN_PCI_ERR_op_failed: | ||
89 | return PCIBIOS_BAD_REGISTER_NUMBER; | ||
90 | |||
91 | case XEN_PCI_ERR_not_implemented: | ||
92 | return PCIBIOS_FUNC_NOT_SUPPORTED; | ||
93 | |||
94 | case XEN_PCI_ERR_access_denied: | ||
95 | return PCIBIOS_SET_FAILED; | ||
96 | } | ||
97 | return errno; | ||
98 | } | ||
99 | |||
100 | static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev) | ||
101 | { | ||
102 | if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags) | ||
103 | && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) { | ||
104 | dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n"); | ||
105 | schedule_work(&pdev->op_work); | ||
106 | } | ||
107 | } | ||
108 | |||
109 | static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) | ||
110 | { | ||
111 | int err = 0; | ||
112 | struct xen_pci_op *active_op = &pdev->sh_info->op; | ||
113 | unsigned long irq_flags; | ||
114 | evtchn_port_t port = pdev->evtchn; | ||
115 | unsigned irq = pdev->irq; | ||
116 | s64 ns, ns_timeout; | ||
117 | struct timeval tv; | ||
118 | |||
119 | spin_lock_irqsave(&pdev->sh_info_lock, irq_flags); | ||
120 | |||
121 | memcpy(active_op, op, sizeof(struct xen_pci_op)); | ||
122 | |||
123 | /* Go */ | ||
124 | wmb(); | ||
125 | set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags); | ||
126 | notify_remote_via_evtchn(port); | ||
127 | |||
128 | /* | ||
129 | * We set a poll timeout of 3 seconds but give up on return after | ||
130 | * 2 seconds. It is better to time out too late rather than too early | ||
131 | * (in the latter case we end up continually re-executing poll() with a | ||
132 | * timeout in the past). 1s difference gives plenty of slack for error. | ||
133 | */ | ||
134 | do_gettimeofday(&tv); | ||
135 | ns_timeout = timeval_to_ns(&tv) + 2 * (s64)NSEC_PER_SEC; | ||
136 | |||
137 | xen_clear_irq_pending(irq); | ||
138 | |||
139 | while (test_bit(_XEN_PCIF_active, | ||
140 | (unsigned long *)&pdev->sh_info->flags)) { | ||
141 | xen_poll_irq_timeout(irq, jiffies + 3*HZ); | ||
142 | xen_clear_irq_pending(irq); | ||
143 | do_gettimeofday(&tv); | ||
144 | ns = timeval_to_ns(&tv); | ||
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 | /* | ||
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 | */ | ||
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 | |||
191 | if (verbose_request) | ||
192 | dev_info(&pdev->xdev->dev, | ||
193 | "read dev=%04x:%02x:%02x.%01x - offset %x size %d\n", | ||
194 | pci_domain_nr(bus), bus->number, PCI_SLOT(devfn), | ||
195 | PCI_FUNC(devfn), where, size); | ||
196 | |||
197 | err = do_pci_op(pdev, &op); | ||
198 | |||
199 | if (likely(!err)) { | ||
200 | if (verbose_request) | ||
201 | dev_info(&pdev->xdev->dev, "read got back value %x\n", | ||
202 | op.value); | ||
203 | |||
204 | *val = op.value; | ||
205 | } else if (err == -ENODEV) { | ||
206 | /* No device here, pretend that it just returned 0 */ | ||
207 | err = 0; | ||
208 | *val = 0; | ||
209 | } | ||
210 | |||
211 | return errno_to_pcibios_err(err); | ||
212 | } | ||
213 | |||
214 | /* Access to this function is spinlocked in drivers/pci/access.c */ | ||
215 | static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn, | ||
216 | int where, int size, u32 val) | ||
217 | { | ||
218 | struct xen_pci_op op = { | ||
219 | .cmd = XEN_PCI_OP_conf_write, | ||
220 | .domain = pci_domain_nr(bus), | ||
221 | .bus = bus->number, | ||
222 | .devfn = devfn, | ||
223 | .offset = where, | ||
224 | .size = size, | ||
225 | .value = val, | ||
226 | }; | ||
227 | struct pcifront_sd *sd = bus->sysdata; | ||
228 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | ||
229 | |||
230 | if (verbose_request) | ||
231 | dev_info(&pdev->xdev->dev, | ||
232 | "write dev=%04x:%02x:%02x.%01x - " | ||
233 | "offset %x size %d val %x\n", | ||
234 | pci_domain_nr(bus), bus->number, | ||
235 | PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); | ||
236 | |||
237 | return errno_to_pcibios_err(do_pci_op(pdev, &op)); | ||
238 | } | ||
239 | |||
240 | struct pci_ops pcifront_bus_ops = { | ||
241 | .read = pcifront_bus_read, | ||
242 | .write = pcifront_bus_write, | ||
243 | }; | ||
244 | |||
245 | #ifdef CONFIG_PCI_MSI | ||
246 | static int pci_frontend_enable_msix(struct pci_dev *dev, | ||
247 | int **vector, int nvec) | ||
248 | { | ||
249 | int err; | ||
250 | int i; | ||
251 | struct xen_pci_op op = { | ||
252 | .cmd = XEN_PCI_OP_enable_msix, | ||
253 | .domain = pci_domain_nr(dev->bus), | ||
254 | .bus = dev->bus->number, | ||
255 | .devfn = dev->devfn, | ||
256 | .value = nvec, | ||
257 | }; | ||
258 | struct pcifront_sd *sd = dev->bus->sysdata; | ||
259 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | ||
260 | struct msi_desc *entry; | ||
261 | |||
262 | if (nvec > SH_INFO_MAX_VEC) { | ||
263 | dev_err(&dev->dev, "too much vector for pci frontend: %x." | ||
264 | " Increase SH_INFO_MAX_VEC.\n", nvec); | ||
265 | return -EINVAL; | ||
266 | } | ||
267 | |||
268 | i = 0; | ||
269 | list_for_each_entry(entry, &dev->msi_list, list) { | ||
270 | op.msix_entries[i].entry = entry->msi_attrib.entry_nr; | ||
271 | /* Vector is useless at this point. */ | ||
272 | op.msix_entries[i].vector = -1; | ||
273 | i++; | ||
274 | } | ||
275 | |||
276 | err = do_pci_op(pdev, &op); | ||
277 | |||
278 | if (likely(!err)) { | ||
279 | if (likely(!op.value)) { | ||
280 | /* we get the result */ | ||
281 | for (i = 0; i < nvec; i++) | ||
282 | *(*vector+i) = op.msix_entries[i].vector; | ||
283 | return 0; | ||
284 | } else { | ||
285 | printk(KERN_DEBUG "enable msix get value %x\n", | ||
286 | op.value); | ||
287 | return op.value; | ||
288 | } | ||
289 | } else { | ||
290 | dev_err(&dev->dev, "enable msix get err %x\n", err); | ||
291 | return err; | ||
292 | } | ||
293 | } | ||
294 | |||
295 | static void pci_frontend_disable_msix(struct pci_dev *dev) | ||
296 | { | ||
297 | int err; | ||
298 | struct xen_pci_op op = { | ||
299 | .cmd = XEN_PCI_OP_disable_msix, | ||
300 | .domain = pci_domain_nr(dev->bus), | ||
301 | .bus = dev->bus->number, | ||
302 | .devfn = dev->devfn, | ||
303 | }; | ||
304 | struct pcifront_sd *sd = dev->bus->sysdata; | ||
305 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | ||
306 | |||
307 | err = do_pci_op(pdev, &op); | ||
308 | |||
309 | /* What should do for error ? */ | ||
310 | if (err) | ||
311 | dev_err(&dev->dev, "pci_disable_msix get err %x\n", err); | ||
312 | } | ||
313 | |||
314 | static int pci_frontend_enable_msi(struct pci_dev *dev, int **vector) | ||
315 | { | ||
316 | int err; | ||
317 | struct xen_pci_op op = { | ||
318 | .cmd = XEN_PCI_OP_enable_msi, | ||
319 | .domain = pci_domain_nr(dev->bus), | ||
320 | .bus = dev->bus->number, | ||
321 | .devfn = dev->devfn, | ||
322 | }; | ||
323 | struct pcifront_sd *sd = dev->bus->sysdata; | ||
324 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | ||
325 | |||
326 | err = do_pci_op(pdev, &op); | ||
327 | if (likely(!err)) { | ||
328 | *(*vector) = op.value; | ||
329 | } else { | ||
330 | dev_err(&dev->dev, "pci frontend enable msi failed for dev " | ||
331 | "%x:%x\n", op.bus, op.devfn); | ||
332 | err = -EINVAL; | ||
333 | } | ||
334 | return err; | ||
335 | } | ||
336 | |||
337 | static void pci_frontend_disable_msi(struct pci_dev *dev) | ||
338 | { | ||
339 | int err; | ||
340 | struct xen_pci_op op = { | ||
341 | .cmd = XEN_PCI_OP_disable_msi, | ||
342 | .domain = pci_domain_nr(dev->bus), | ||
343 | .bus = dev->bus->number, | ||
344 | .devfn = dev->devfn, | ||
345 | }; | ||
346 | struct pcifront_sd *sd = dev->bus->sysdata; | ||
347 | struct pcifront_device *pdev = pcifront_get_pdev(sd); | ||
348 | |||
349 | err = do_pci_op(pdev, &op); | ||
350 | if (err == XEN_PCI_ERR_dev_not_found) { | ||
351 | /* XXX No response from backend, what shall we do? */ | ||
352 | printk(KERN_DEBUG "get no response from backend for disable MSI\n"); | ||
353 | return; | ||
354 | } | ||
355 | if (err) | ||
356 | /* how can pciback notify us fail? */ | ||
357 | printk(KERN_DEBUG "get fake response frombackend\n"); | ||
358 | } | ||
359 | |||
360 | static struct xen_pci_frontend_ops pci_frontend_ops = { | ||
361 | .enable_msi = pci_frontend_enable_msi, | ||
362 | .disable_msi = pci_frontend_disable_msi, | ||
363 | .enable_msix = pci_frontend_enable_msix, | ||
364 | .disable_msix = pci_frontend_disable_msix, | ||
365 | }; | ||
366 | |||
367 | static void pci_frontend_registrar(int enable) | ||
368 | { | ||
369 | if (enable) | ||
370 | xen_pci_frontend = &pci_frontend_ops; | ||
371 | else | ||
372 | xen_pci_frontend = NULL; | ||
373 | }; | ||
374 | #else | ||
375 | static inline void pci_frontend_registrar(int enable) { }; | ||
376 | #endif /* CONFIG_PCI_MSI */ | ||
377 | |||
378 | /* Claim resources for the PCI frontend as-is, backend won't allow changes */ | ||
379 | static int pcifront_claim_resource(struct pci_dev *dev, void *data) | ||
380 | { | ||
381 | struct pcifront_device *pdev = data; | ||
382 | int i; | ||
383 | struct resource *r; | ||
384 | |||
385 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | ||
386 | r = &dev->resource[i]; | ||
387 | |||
388 | if (!r->parent && r->start && r->flags) { | ||
389 | dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n", | ||
390 | pci_name(dev), i); | ||
391 | if (pci_claim_resource(dev, i)) { | ||
392 | dev_err(&pdev->xdev->dev, "Could not claim " | ||
393 | "resource %s/%d! Device offline. Try " | ||
394 | "giving less than 4GB to domain.\n", | ||
395 | pci_name(dev), i); | ||
396 | } | ||
397 | } | ||
398 | } | ||
399 | |||
400 | return 0; | ||
401 | } | ||
402 | |||
403 | static int __devinit pcifront_scan_bus(struct pcifront_device *pdev, | ||
404 | unsigned int domain, unsigned int bus, | ||
405 | struct pci_bus *b) | ||
406 | { | ||
407 | struct pci_dev *d; | ||
408 | unsigned int devfn; | ||
409 | |||
410 | /* Scan the bus for functions and add. | ||
411 | * We omit handling of PCI bridge attachment because pciback prevents | ||
412 | * bridges from being exported. | ||
413 | */ | ||
414 | for (devfn = 0; devfn < 0x100; devfn++) { | ||
415 | d = pci_get_slot(b, devfn); | ||
416 | if (d) { | ||
417 | /* Device is already known. */ | ||
418 | pci_dev_put(d); | ||
419 | continue; | ||
420 | } | ||
421 | |||
422 | d = pci_scan_single_device(b, devfn); | ||
423 | if (d) | ||
424 | dev_info(&pdev->xdev->dev, "New device on " | ||
425 | "%04x:%02x:%02x.%02x found.\n", domain, bus, | ||
426 | PCI_SLOT(devfn), PCI_FUNC(devfn)); | ||
427 | } | ||
428 | |||
429 | return 0; | ||
430 | } | ||
431 | |||
432 | static int __devinit pcifront_scan_root(struct pcifront_device *pdev, | ||
433 | unsigned int domain, unsigned int bus) | ||
434 | { | ||
435 | struct pci_bus *b; | ||
436 | struct pcifront_sd *sd = NULL; | ||
437 | struct pci_bus_entry *bus_entry = NULL; | ||
438 | int err = 0; | ||
439 | |||
440 | #ifndef CONFIG_PCI_DOMAINS | ||
441 | if (domain != 0) { | ||
442 | dev_err(&pdev->xdev->dev, | ||
443 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | ||
444 | dev_err(&pdev->xdev->dev, | ||
445 | "Please compile with CONFIG_PCI_DOMAINS\n"); | ||
446 | err = -EINVAL; | ||
447 | goto err_out; | ||
448 | } | ||
449 | #endif | ||
450 | |||
451 | dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", | ||
452 | domain, bus); | ||
453 | |||
454 | bus_entry = kmalloc(sizeof(*bus_entry), GFP_KERNEL); | ||
455 | sd = kmalloc(sizeof(*sd), GFP_KERNEL); | ||
456 | if (!bus_entry || !sd) { | ||
457 | err = -ENOMEM; | ||
458 | goto err_out; | ||
459 | } | ||
460 | pcifront_init_sd(sd, domain, bus, pdev); | ||
461 | |||
462 | b = pci_scan_bus_parented(&pdev->xdev->dev, bus, | ||
463 | &pcifront_bus_ops, sd); | ||
464 | if (!b) { | ||
465 | dev_err(&pdev->xdev->dev, | ||
466 | "Error creating PCI Frontend Bus!\n"); | ||
467 | err = -ENOMEM; | ||
468 | goto err_out; | ||
469 | } | ||
470 | |||
471 | bus_entry->bus = b; | ||
472 | |||
473 | list_add(&bus_entry->list, &pdev->root_buses); | ||
474 | |||
475 | /* pci_scan_bus_parented skips devices which do not have a have | ||
476 | * devfn==0. The pcifront_scan_bus enumerates all devfn. */ | ||
477 | err = pcifront_scan_bus(pdev, domain, bus, b); | ||
478 | |||
479 | /* Claim resources before going "live" with our devices */ | ||
480 | pci_walk_bus(b, pcifront_claim_resource, pdev); | ||
481 | |||
482 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | ||
483 | pci_bus_add_devices(b); | ||
484 | |||
485 | return err; | ||
486 | |||
487 | err_out: | ||
488 | kfree(bus_entry); | ||
489 | kfree(sd); | ||
490 | |||
491 | return err; | ||
492 | } | ||
493 | |||
494 | static int __devinit pcifront_rescan_root(struct pcifront_device *pdev, | ||
495 | unsigned int domain, unsigned int bus) | ||
496 | { | ||
497 | int err; | ||
498 | struct pci_bus *b; | ||
499 | |||
500 | #ifndef CONFIG_PCI_DOMAINS | ||
501 | if (domain != 0) { | ||
502 | dev_err(&pdev->xdev->dev, | ||
503 | "PCI Root in non-zero PCI Domain! domain=%d\n", domain); | ||
504 | dev_err(&pdev->xdev->dev, | ||
505 | "Please compile with CONFIG_PCI_DOMAINS\n"); | ||
506 | return -EINVAL; | ||
507 | } | ||
508 | #endif | ||
509 | |||
510 | dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n", | ||
511 | domain, bus); | ||
512 | |||
513 | b = pci_find_bus(domain, bus); | ||
514 | if (!b) | ||
515 | /* If the bus is unknown, create it. */ | ||
516 | return pcifront_scan_root(pdev, domain, bus); | ||
517 | |||
518 | err = pcifront_scan_bus(pdev, domain, bus, b); | ||
519 | |||
520 | /* Claim resources before going "live" with our devices */ | ||
521 | pci_walk_bus(b, pcifront_claim_resource, pdev); | ||
522 | |||
523 | /* Create SysFS and notify udev of the devices. Aka: "going live" */ | ||
524 | pci_bus_add_devices(b); | ||
525 | |||
526 | return err; | ||
527 | } | ||
528 | |||
529 | static void free_root_bus_devs(struct pci_bus *bus) | ||
530 | { | ||
531 | struct pci_dev *dev; | ||
532 | |||
533 | while (!list_empty(&bus->devices)) { | ||
534 | dev = container_of(bus->devices.next, struct pci_dev, | ||
535 | bus_list); | ||
536 | dev_dbg(&dev->dev, "removing device\n"); | ||
537 | pci_remove_bus_device(dev); | ||
538 | } | ||
539 | } | ||
540 | |||
541 | static void pcifront_free_roots(struct pcifront_device *pdev) | ||
542 | { | ||
543 | struct pci_bus_entry *bus_entry, *t; | ||
544 | |||
545 | dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n"); | ||
546 | |||
547 | list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) { | ||
548 | list_del(&bus_entry->list); | ||
549 | |||
550 | free_root_bus_devs(bus_entry->bus); | ||
551 | |||
552 | kfree(bus_entry->bus->sysdata); | ||
553 | |||
554 | device_unregister(bus_entry->bus->bridge); | ||
555 | pci_remove_bus(bus_entry->bus); | ||
556 | |||
557 | kfree(bus_entry); | ||
558 | } | ||
559 | } | ||
560 | |||
561 | static pci_ers_result_t pcifront_common_process(int cmd, | ||
562 | struct pcifront_device *pdev, | ||
563 | pci_channel_state_t state) | ||
564 | { | ||
565 | pci_ers_result_t result; | ||
566 | struct pci_driver *pdrv; | ||
567 | int bus = pdev->sh_info->aer_op.bus; | ||
568 | int devfn = pdev->sh_info->aer_op.devfn; | ||
569 | struct pci_dev *pcidev; | ||
570 | int flag = 0; | ||
571 | |||
572 | dev_dbg(&pdev->xdev->dev, | ||
573 | "pcifront AER process: cmd %x (bus:%x, devfn%x)", | ||
574 | cmd, bus, devfn); | ||
575 | result = PCI_ERS_RESULT_NONE; | ||
576 | |||
577 | pcidev = pci_get_bus_and_slot(bus, devfn); | ||
578 | if (!pcidev || !pcidev->driver) { | ||
579 | dev_err(&pcidev->dev, | ||
580 | "device or driver is NULL\n"); | ||
581 | return result; | ||
582 | } | ||
583 | pdrv = pcidev->driver; | ||
584 | |||
585 | if (get_driver(&pdrv->driver)) { | ||
586 | if (pdrv->err_handler && pdrv->err_handler->error_detected) { | ||
587 | dev_dbg(&pcidev->dev, | ||
588 | "trying to call AER service\n"); | ||
589 | if (pcidev) { | ||
590 | flag = 1; | ||
591 | switch (cmd) { | ||
592 | case XEN_PCI_OP_aer_detected: | ||
593 | result = pdrv->err_handler-> | ||
594 | error_detected(pcidev, state); | ||
595 | break; | ||
596 | case XEN_PCI_OP_aer_mmio: | ||
597 | result = pdrv->err_handler-> | ||
598 | mmio_enabled(pcidev); | ||
599 | break; | ||
600 | case XEN_PCI_OP_aer_slotreset: | ||
601 | result = pdrv->err_handler-> | ||
602 | slot_reset(pcidev); | ||
603 | break; | ||
604 | case XEN_PCI_OP_aer_resume: | ||
605 | pdrv->err_handler->resume(pcidev); | ||
606 | break; | ||
607 | default: | ||
608 | dev_err(&pdev->xdev->dev, | ||
609 | "bad request in aer recovery " | ||
610 | "operation!\n"); | ||
611 | |||
612 | } | ||
613 | } | ||
614 | } | ||
615 | put_driver(&pdrv->driver); | ||
616 | } | ||
617 | if (!flag) | ||
618 | result = PCI_ERS_RESULT_NONE; | ||
619 | |||
620 | return result; | ||
621 | } | ||
622 | |||
623 | |||
624 | static void pcifront_do_aer(struct work_struct *data) | ||
625 | { | ||
626 | struct pcifront_device *pdev = | ||
627 | container_of(data, struct pcifront_device, op_work); | ||
628 | int cmd = pdev->sh_info->aer_op.cmd; | ||
629 | pci_channel_state_t state = | ||
630 | (pci_channel_state_t)pdev->sh_info->aer_op.err; | ||
631 | |||
632 | /*If a pci_conf op is in progress, | ||
633 | we have to wait until it is done before service aer op*/ | ||
634 | dev_dbg(&pdev->xdev->dev, | ||
635 | "pcifront service aer bus %x devfn %x\n", | ||
636 | pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn); | ||
637 | |||
638 | pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state); | ||
639 | |||
640 | /* Post the operation to the guest. */ | ||
641 | wmb(); | ||
642 | clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags); | ||
643 | notify_remote_via_evtchn(pdev->evtchn); | ||
644 | |||
645 | /*in case of we lost an aer request in four lines time_window*/ | ||
646 | smp_mb__before_clear_bit(); | ||
647 | clear_bit(_PDEVB_op_active, &pdev->flags); | ||
648 | smp_mb__after_clear_bit(); | ||
649 | |||
650 | schedule_pcifront_aer_op(pdev); | ||
651 | |||
652 | } | ||
653 | |||
654 | static irqreturn_t pcifront_handler_aer(int irq, void *dev) | ||
655 | { | ||
656 | struct pcifront_device *pdev = dev; | ||
657 | schedule_pcifront_aer_op(pdev); | ||
658 | return IRQ_HANDLED; | ||
659 | } | ||
660 | static int pcifront_connect(struct pcifront_device *pdev) | ||
661 | { | ||
662 | int err = 0; | ||
663 | |||
664 | spin_lock(&pcifront_dev_lock); | ||
665 | |||
666 | if (!pcifront_dev) { | ||
667 | dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); | ||
668 | pcifront_dev = pdev; | ||
669 | } else { | ||
670 | dev_err(&pdev->xdev->dev, "PCI frontend already installed!\n"); | ||
671 | err = -EEXIST; | ||
672 | } | ||
673 | |||
674 | spin_unlock(&pcifront_dev_lock); | ||
675 | |||
676 | return err; | ||
677 | } | ||
678 | |||
679 | static void pcifront_disconnect(struct pcifront_device *pdev) | ||
680 | { | ||
681 | spin_lock(&pcifront_dev_lock); | ||
682 | |||
683 | if (pdev == pcifront_dev) { | ||
684 | dev_info(&pdev->xdev->dev, | ||
685 | "Disconnecting PCI Frontend Buses\n"); | ||
686 | pcifront_dev = NULL; | ||
687 | } | ||
688 | |||
689 | spin_unlock(&pcifront_dev_lock); | ||
690 | } | ||
691 | static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev) | ||
692 | { | ||
693 | struct pcifront_device *pdev; | ||
694 | |||
695 | pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL); | ||
696 | if (pdev == NULL) | ||
697 | goto out; | ||
698 | |||
699 | pdev->sh_info = | ||
700 | (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL); | ||
701 | if (pdev->sh_info == NULL) { | ||
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; | ||
719 | pdev->gnt_ref = INVALID_GRANT_REF; | ||
720 | pdev->irq = -1; | ||
721 | |||
722 | INIT_WORK(&pdev->op_work, pcifront_do_aer); | ||
723 | |||
724 | dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n", | ||
725 | pdev, pdev->sh_info); | ||
726 | out: | ||
727 | return pdev; | ||
728 | } | ||
729 | |||
730 | static void free_pdev(struct pcifront_device *pdev) | ||
731 | { | ||
732 | dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev); | ||
733 | |||
734 | pcifront_free_roots(pdev); | ||
735 | |||
736 | /*For PCIE_AER error handling job*/ | ||
737 | flush_scheduled_work(); | ||
738 | |||
739 | if (pdev->irq >= 0) | ||
740 | unbind_from_irqhandler(pdev->irq, pdev); | ||
741 | |||
742 | if (pdev->evtchn != INVALID_EVTCHN) | ||
743 | xenbus_free_evtchn(pdev->xdev, pdev->evtchn); | ||
744 | |||
745 | if (pdev->gnt_ref != INVALID_GRANT_REF) | ||
746 | gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */, | ||
747 | (unsigned long)pdev->sh_info); | ||
748 | else | ||
749 | free_page((unsigned long)pdev->sh_info); | ||
750 | |||
751 | dev_set_drvdata(&pdev->xdev->dev, NULL); | ||
752 | |||
753 | kfree(pdev); | ||
754 | } | ||
755 | |||
756 | static int pcifront_publish_info(struct pcifront_device *pdev) | ||
757 | { | ||
758 | int err = 0; | ||
759 | struct xenbus_transaction trans; | ||
760 | |||
761 | err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info)); | ||
762 | if (err < 0) | ||
763 | goto out; | ||
764 | |||
765 | pdev->gnt_ref = err; | ||
766 | |||
767 | err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn); | ||
768 | if (err) | ||
769 | goto out; | ||
770 | |||
771 | err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer, | ||
772 | 0, "pcifront", pdev); | ||
773 | |||
774 | if (err < 0) | ||
775 | return err; | ||
776 | |||
777 | pdev->irq = err; | ||
778 | |||
779 | do_publish: | ||
780 | err = xenbus_transaction_start(&trans); | ||
781 | if (err) { | ||
782 | xenbus_dev_fatal(pdev->xdev, err, | ||
783 | "Error writing configuration for backend " | ||
784 | "(start transaction)"); | ||
785 | goto out; | ||
786 | } | ||
787 | |||
788 | err = xenbus_printf(trans, pdev->xdev->nodename, | ||
789 | "pci-op-ref", "%u", pdev->gnt_ref); | ||
790 | if (!err) | ||
791 | err = xenbus_printf(trans, pdev->xdev->nodename, | ||
792 | "event-channel", "%u", pdev->evtchn); | ||
793 | if (!err) | ||
794 | err = xenbus_printf(trans, pdev->xdev->nodename, | ||
795 | "magic", XEN_PCI_MAGIC); | ||
796 | |||
797 | if (err) { | ||
798 | xenbus_transaction_end(trans, 1); | ||
799 | xenbus_dev_fatal(pdev->xdev, err, | ||
800 | "Error writing configuration for backend"); | ||
801 | goto out; | ||
802 | } else { | ||
803 | err = xenbus_transaction_end(trans, 0); | ||
804 | if (err == -EAGAIN) | ||
805 | goto do_publish; | ||
806 | else if (err) { | ||
807 | xenbus_dev_fatal(pdev->xdev, err, | ||
808 | "Error completing transaction " | ||
809 | "for backend"); | ||
810 | goto out; | ||
811 | } | ||
812 | } | ||
813 | |||
814 | xenbus_switch_state(pdev->xdev, XenbusStateInitialised); | ||
815 | |||
816 | dev_dbg(&pdev->xdev->dev, "publishing successful!\n"); | ||
817 | |||
818 | out: | ||
819 | return err; | ||
820 | } | ||
821 | |||
822 | static int __devinit pcifront_try_connect(struct pcifront_device *pdev) | ||
823 | { | ||
824 | int err = -EFAULT; | ||
825 | int i, num_roots, len; | ||
826 | char str[64]; | ||
827 | unsigned int domain, bus; | ||
828 | |||
829 | |||
830 | /* Only connect once */ | ||
831 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | ||
832 | XenbusStateInitialised) | ||
833 | goto out; | ||
834 | |||
835 | err = pcifront_connect(pdev); | ||
836 | if (err) { | ||
837 | xenbus_dev_fatal(pdev->xdev, err, | ||
838 | "Error connecting PCI Frontend"); | ||
839 | goto out; | ||
840 | } | ||
841 | |||
842 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | ||
843 | "root_num", "%d", &num_roots); | ||
844 | if (err == -ENOENT) { | ||
845 | xenbus_dev_error(pdev->xdev, err, | ||
846 | "No PCI Roots found, trying 0000:00"); | ||
847 | err = pcifront_scan_root(pdev, 0, 0); | ||
848 | num_roots = 0; | ||
849 | } else if (err != 1) { | ||
850 | if (err == 0) | ||
851 | err = -EINVAL; | ||
852 | xenbus_dev_fatal(pdev->xdev, err, | ||
853 | "Error reading number of PCI roots"); | ||
854 | goto out; | ||
855 | } | ||
856 | |||
857 | for (i = 0; i < num_roots; i++) { | ||
858 | len = snprintf(str, sizeof(str), "root-%d", i); | ||
859 | if (unlikely(len >= (sizeof(str) - 1))) { | ||
860 | err = -ENOMEM; | ||
861 | goto out; | ||
862 | } | ||
863 | |||
864 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | ||
865 | "%x:%x", &domain, &bus); | ||
866 | if (err != 2) { | ||
867 | if (err >= 0) | ||
868 | err = -EINVAL; | ||
869 | xenbus_dev_fatal(pdev->xdev, err, | ||
870 | "Error reading PCI root %d", i); | ||
871 | goto out; | ||
872 | } | ||
873 | |||
874 | err = pcifront_scan_root(pdev, domain, bus); | ||
875 | if (err) { | ||
876 | xenbus_dev_fatal(pdev->xdev, err, | ||
877 | "Error scanning PCI root %04x:%02x", | ||
878 | domain, bus); | ||
879 | goto out; | ||
880 | } | ||
881 | } | ||
882 | |||
883 | err = xenbus_switch_state(pdev->xdev, XenbusStateConnected); | ||
884 | |||
885 | out: | ||
886 | return err; | ||
887 | } | ||
888 | |||
889 | static int pcifront_try_disconnect(struct pcifront_device *pdev) | ||
890 | { | ||
891 | int err = 0; | ||
892 | enum xenbus_state prev_state; | ||
893 | |||
894 | |||
895 | prev_state = xenbus_read_driver_state(pdev->xdev->nodename); | ||
896 | |||
897 | if (prev_state >= XenbusStateClosing) | ||
898 | goto out; | ||
899 | |||
900 | if (prev_state == XenbusStateConnected) { | ||
901 | pcifront_free_roots(pdev); | ||
902 | pcifront_disconnect(pdev); | ||
903 | } | ||
904 | |||
905 | err = xenbus_switch_state(pdev->xdev, XenbusStateClosed); | ||
906 | |||
907 | out: | ||
908 | |||
909 | return err; | ||
910 | } | ||
911 | |||
912 | static int __devinit pcifront_attach_devices(struct pcifront_device *pdev) | ||
913 | { | ||
914 | int err = -EFAULT; | ||
915 | int i, num_roots, len; | ||
916 | unsigned int domain, bus; | ||
917 | char str[64]; | ||
918 | |||
919 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | ||
920 | XenbusStateReconfiguring) | ||
921 | goto out; | ||
922 | |||
923 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, | ||
924 | "root_num", "%d", &num_roots); | ||
925 | if (err == -ENOENT) { | ||
926 | xenbus_dev_error(pdev->xdev, err, | ||
927 | "No PCI Roots found, trying 0000:00"); | ||
928 | err = pcifront_rescan_root(pdev, 0, 0); | ||
929 | num_roots = 0; | ||
930 | } else if (err != 1) { | ||
931 | if (err == 0) | ||
932 | err = -EINVAL; | ||
933 | xenbus_dev_fatal(pdev->xdev, err, | ||
934 | "Error reading number of PCI roots"); | ||
935 | goto out; | ||
936 | } | ||
937 | |||
938 | for (i = 0; i < num_roots; i++) { | ||
939 | len = snprintf(str, sizeof(str), "root-%d", i); | ||
940 | if (unlikely(len >= (sizeof(str) - 1))) { | ||
941 | err = -ENOMEM; | ||
942 | goto out; | ||
943 | } | ||
944 | |||
945 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | ||
946 | "%x:%x", &domain, &bus); | ||
947 | if (err != 2) { | ||
948 | if (err >= 0) | ||
949 | err = -EINVAL; | ||
950 | xenbus_dev_fatal(pdev->xdev, err, | ||
951 | "Error reading PCI root %d", i); | ||
952 | goto out; | ||
953 | } | ||
954 | |||
955 | err = pcifront_rescan_root(pdev, domain, bus); | ||
956 | if (err) { | ||
957 | xenbus_dev_fatal(pdev->xdev, err, | ||
958 | "Error scanning PCI root %04x:%02x", | ||
959 | domain, bus); | ||
960 | goto out; | ||
961 | } | ||
962 | } | ||
963 | |||
964 | xenbus_switch_state(pdev->xdev, XenbusStateConnected); | ||
965 | |||
966 | out: | ||
967 | return err; | ||
968 | } | ||
969 | |||
970 | static int pcifront_detach_devices(struct pcifront_device *pdev) | ||
971 | { | ||
972 | int err = 0; | ||
973 | int i, num_devs; | ||
974 | unsigned int domain, bus, slot, func; | ||
975 | struct pci_bus *pci_bus; | ||
976 | struct pci_dev *pci_dev; | ||
977 | char str[64]; | ||
978 | |||
979 | if (xenbus_read_driver_state(pdev->xdev->nodename) != | ||
980 | XenbusStateConnected) | ||
981 | goto out; | ||
982 | |||
983 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d", | ||
984 | &num_devs); | ||
985 | if (err != 1) { | ||
986 | if (err >= 0) | ||
987 | err = -EINVAL; | ||
988 | xenbus_dev_fatal(pdev->xdev, err, | ||
989 | "Error reading number of PCI devices"); | ||
990 | goto out; | ||
991 | } | ||
992 | |||
993 | /* Find devices being detached and remove them. */ | ||
994 | for (i = 0; i < num_devs; i++) { | ||
995 | int l, state; | ||
996 | l = snprintf(str, sizeof(str), "state-%d", i); | ||
997 | if (unlikely(l >= (sizeof(str) - 1))) { | ||
998 | err = -ENOMEM; | ||
999 | goto out; | ||
1000 | } | ||
1001 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d", | ||
1002 | &state); | ||
1003 | if (err != 1) | ||
1004 | state = XenbusStateUnknown; | ||
1005 | |||
1006 | if (state != XenbusStateClosing) | ||
1007 | continue; | ||
1008 | |||
1009 | /* Remove device. */ | ||
1010 | l = snprintf(str, sizeof(str), "vdev-%d", i); | ||
1011 | if (unlikely(l >= (sizeof(str) - 1))) { | ||
1012 | err = -ENOMEM; | ||
1013 | goto out; | ||
1014 | } | ||
1015 | err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, | ||
1016 | "%x:%x:%x.%x", &domain, &bus, &slot, &func); | ||
1017 | if (err != 4) { | ||
1018 | if (err >= 0) | ||
1019 | err = -EINVAL; | ||
1020 | xenbus_dev_fatal(pdev->xdev, err, | ||
1021 | "Error reading PCI device %d", i); | ||
1022 | goto out; | ||
1023 | } | ||
1024 | |||
1025 | pci_bus = pci_find_bus(domain, bus); | ||
1026 | if (!pci_bus) { | ||
1027 | dev_dbg(&pdev->xdev->dev, "Cannot get bus %04x:%02x\n", | ||
1028 | domain, bus); | ||
1029 | continue; | ||
1030 | } | ||
1031 | pci_dev = pci_get_slot(pci_bus, PCI_DEVFN(slot, func)); | ||
1032 | if (!pci_dev) { | ||
1033 | dev_dbg(&pdev->xdev->dev, | ||
1034 | "Cannot get PCI device %04x:%02x:%02x.%02x\n", | ||
1035 | domain, bus, slot, func); | ||
1036 | continue; | ||
1037 | } | ||
1038 | pci_remove_bus_device(pci_dev); | ||
1039 | pci_dev_put(pci_dev); | ||
1040 | |||
1041 | dev_dbg(&pdev->xdev->dev, | ||
1042 | "PCI device %04x:%02x:%02x.%02x removed.\n", | ||
1043 | domain, bus, slot, func); | ||
1044 | } | ||
1045 | |||
1046 | err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring); | ||
1047 | |||
1048 | out: | ||
1049 | return err; | ||
1050 | } | ||
1051 | |||
1052 | static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev, | ||
1053 | enum xenbus_state be_state) | ||
1054 | { | ||
1055 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | ||
1056 | |||
1057 | switch (be_state) { | ||
1058 | case XenbusStateUnknown: | ||
1059 | case XenbusStateInitialising: | ||
1060 | case XenbusStateInitWait: | ||
1061 | case XenbusStateInitialised: | ||
1062 | case XenbusStateClosed: | ||
1063 | break; | ||
1064 | |||
1065 | case XenbusStateConnected: | ||
1066 | pcifront_try_connect(pdev); | ||
1067 | break; | ||
1068 | |||
1069 | case XenbusStateClosing: | ||
1070 | dev_warn(&xdev->dev, "backend going away!\n"); | ||
1071 | pcifront_try_disconnect(pdev); | ||
1072 | break; | ||
1073 | |||
1074 | case XenbusStateReconfiguring: | ||
1075 | pcifront_detach_devices(pdev); | ||
1076 | break; | ||
1077 | |||
1078 | case XenbusStateReconfigured: | ||
1079 | pcifront_attach_devices(pdev); | ||
1080 | break; | ||
1081 | } | ||
1082 | } | ||
1083 | |||
1084 | static int pcifront_xenbus_probe(struct xenbus_device *xdev, | ||
1085 | const struct xenbus_device_id *id) | ||
1086 | { | ||
1087 | int err = 0; | ||
1088 | struct pcifront_device *pdev = alloc_pdev(xdev); | ||
1089 | |||
1090 | if (pdev == NULL) { | ||
1091 | err = -ENOMEM; | ||
1092 | xenbus_dev_fatal(xdev, err, | ||
1093 | "Error allocating pcifront_device struct"); | ||
1094 | goto out; | ||
1095 | } | ||
1096 | |||
1097 | err = pcifront_publish_info(pdev); | ||
1098 | if (err) | ||
1099 | free_pdev(pdev); | ||
1100 | |||
1101 | out: | ||
1102 | return err; | ||
1103 | } | ||
1104 | |||
1105 | static int pcifront_xenbus_remove(struct xenbus_device *xdev) | ||
1106 | { | ||
1107 | struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev); | ||
1108 | if (pdev) | ||
1109 | free_pdev(pdev); | ||
1110 | |||
1111 | return 0; | ||
1112 | } | ||
1113 | |||
1114 | static const struct xenbus_device_id xenpci_ids[] = { | ||
1115 | {"pci"}, | ||
1116 | {""}, | ||
1117 | }; | ||
1118 | |||
1119 | static struct xenbus_driver xenbus_pcifront_driver = { | ||
1120 | .name = "pcifront", | ||
1121 | .owner = THIS_MODULE, | ||
1122 | .ids = xenpci_ids, | ||
1123 | .probe = pcifront_xenbus_probe, | ||
1124 | .remove = pcifront_xenbus_remove, | ||
1125 | .otherend_changed = pcifront_backend_changed, | ||
1126 | }; | ||
1127 | |||
1128 | static int __init pcifront_init(void) | ||
1129 | { | ||
1130 | if (!xen_pv_domain() || xen_initial_domain()) | ||
1131 | return -ENODEV; | ||
1132 | |||
1133 | pci_frontend_registrar(1 /* enable */); | ||
1134 | |||
1135 | return xenbus_register_frontend(&xenbus_pcifront_driver); | ||
1136 | } | ||
1137 | |||
1138 | static void __exit pcifront_cleanup(void) | ||
1139 | { | ||
1140 | xenbus_unregister_driver(&xenbus_pcifront_driver); | ||
1141 | pci_frontend_registrar(0 /* disable */); | ||
1142 | } | ||
1143 | module_init(pcifront_init); | ||
1144 | module_exit(pcifront_cleanup); | ||
1145 | |||
1146 | MODULE_DESCRIPTION("Xen PCI passthrough frontend."); | ||
1147 | MODULE_LICENSE("GPL"); | ||
1148 | MODULE_ALIAS("xen:pci"); | ||
diff --git a/include/xen/interface/io/pciif.h b/include/xen/interface/io/pciif.h new file mode 100644 index 000000000000..d9922ae36eb5 --- /dev/null +++ b/include/xen/interface/io/pciif.h | |||
@@ -0,0 +1,112 @@ | |||
1 | /* | ||
2 | * PCI Backend/Frontend Common Data Structures & Macros | ||
3 | * | ||
4 | * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
5 | * of this software and associated documentation files (the "Software"), to | ||
6 | * deal in the Software without restriction, including without limitation the | ||
7 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
8 | * sell copies of the Software, and to permit persons to whom the Software is | ||
9 | * furnished to do so, subject to the following conditions: | ||
10 | * | ||
11 | * The above copyright notice and this permission notice shall be included in | ||
12 | * all copies or substantial portions of the Software. | ||
13 | * | ||
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
17 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
19 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
20 | * DEALINGS IN THE SOFTWARE. | ||
21 | * | ||
22 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> | ||
23 | */ | ||
24 | #ifndef __XEN_PCI_COMMON_H__ | ||
25 | #define __XEN_PCI_COMMON_H__ | ||
26 | |||
27 | /* Be sure to bump this number if you change this file */ | ||
28 | #define XEN_PCI_MAGIC "7" | ||
29 | |||
30 | /* xen_pci_sharedinfo flags */ | ||
31 | #define _XEN_PCIF_active (0) | ||
32 | #define XEN_PCIF_active (1<<_XEN_PCIF_active) | ||
33 | #define _XEN_PCIB_AERHANDLER (1) | ||
34 | #define XEN_PCIB_AERHANDLER (1<<_XEN_PCIB_AERHANDLER) | ||
35 | #define _XEN_PCIB_active (2) | ||
36 | #define XEN_PCIB_active (1<<_XEN_PCIB_active) | ||
37 | |||
38 | /* xen_pci_op commands */ | ||
39 | #define XEN_PCI_OP_conf_read (0) | ||
40 | #define XEN_PCI_OP_conf_write (1) | ||
41 | #define XEN_PCI_OP_enable_msi (2) | ||
42 | #define XEN_PCI_OP_disable_msi (3) | ||
43 | #define XEN_PCI_OP_enable_msix (4) | ||
44 | #define XEN_PCI_OP_disable_msix (5) | ||
45 | #define XEN_PCI_OP_aer_detected (6) | ||
46 | #define XEN_PCI_OP_aer_resume (7) | ||
47 | #define XEN_PCI_OP_aer_mmio (8) | ||
48 | #define XEN_PCI_OP_aer_slotreset (9) | ||
49 | |||
50 | /* xen_pci_op error numbers */ | ||
51 | #define XEN_PCI_ERR_success (0) | ||
52 | #define XEN_PCI_ERR_dev_not_found (-1) | ||
53 | #define XEN_PCI_ERR_invalid_offset (-2) | ||
54 | #define XEN_PCI_ERR_access_denied (-3) | ||
55 | #define XEN_PCI_ERR_not_implemented (-4) | ||
56 | /* XEN_PCI_ERR_op_failed - backend failed to complete the operation */ | ||
57 | #define XEN_PCI_ERR_op_failed (-5) | ||
58 | |||
59 | /* | ||
60 | * it should be PAGE_SIZE-sizeof(struct xen_pci_op))/sizeof(struct msix_entry)) | ||
61 | * Should not exceed 128 | ||
62 | */ | ||
63 | #define SH_INFO_MAX_VEC 128 | ||
64 | |||
65 | struct xen_msix_entry { | ||
66 | uint16_t vector; | ||
67 | uint16_t entry; | ||
68 | }; | ||
69 | struct xen_pci_op { | ||
70 | /* IN: what action to perform: XEN_PCI_OP_* */ | ||
71 | uint32_t cmd; | ||
72 | |||
73 | /* OUT: will contain an error number (if any) from errno.h */ | ||
74 | int32_t err; | ||
75 | |||
76 | /* IN: which device to touch */ | ||
77 | uint32_t domain; /* PCI Domain/Segment */ | ||
78 | uint32_t bus; | ||
79 | uint32_t devfn; | ||
80 | |||
81 | /* IN: which configuration registers to touch */ | ||
82 | int32_t offset; | ||
83 | int32_t size; | ||
84 | |||
85 | /* IN/OUT: Contains the result after a READ or the value to WRITE */ | ||
86 | uint32_t value; | ||
87 | /* IN: Contains extra infor for this operation */ | ||
88 | uint32_t info; | ||
89 | /*IN: param for msi-x */ | ||
90 | struct xen_msix_entry msix_entries[SH_INFO_MAX_VEC]; | ||
91 | }; | ||
92 | |||
93 | /*used for pcie aer handling*/ | ||
94 | struct xen_pcie_aer_op { | ||
95 | /* IN: what action to perform: XEN_PCI_OP_* */ | ||
96 | uint32_t cmd; | ||
97 | /*IN/OUT: return aer_op result or carry error_detected state as input*/ | ||
98 | int32_t err; | ||
99 | |||
100 | /* IN: which device to touch */ | ||
101 | uint32_t domain; /* PCI Domain/Segment*/ | ||
102 | uint32_t bus; | ||
103 | uint32_t devfn; | ||
104 | }; | ||
105 | struct xen_pci_sharedinfo { | ||
106 | /* flags - XEN_PCIF_* */ | ||
107 | uint32_t flags; | ||
108 | struct xen_pci_op op; | ||
109 | struct xen_pcie_aer_op aer_op; | ||
110 | }; | ||
111 | |||
112 | #endif /* __XEN_PCI_COMMON_H__ */ | ||