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xen-pcifront: don't use flush_scheduled_work()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pci / xen-pcifront.c
CommitLineData
956a9202
RW		 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>
956a9202
RW		 16#include <xen/interface/io/pciif.h>
17#include <asm/xen/pci.h>
18#include <linux/interrupt.h>
19#include <asm/atomic.h>
20#include <linux/workqueue.h>
21#include <linux/bitops.h>
22#include <linux/time.h>
23
24#define INVALID_GRANT_REF (0)
25#define INVALID_EVTCHN (-1)
26
27struct pci_bus_entry {
28 struct list_head list;
29 struct pci_bus *bus;
30};
31
32#define _PDEVB_op_active (0)
33#define PDEVB_op_active (1 << (_PDEVB_op_active))
34
35struct pcifront_device {
36 struct xenbus_device *xdev;
37 struct list_head root_buses;
38
39 int evtchn;
40 int gnt_ref;
41
42 int irq;
43
44 /* Lock this when doing any operations in sh_info */
45 spinlock_t sh_info_lock;
46 struct xen_pci_sharedinfo *sh_info;
47 struct work_struct op_work;
48 unsigned long flags;
49
50};
51
52struct pcifront_sd {
53 int domain;
54 struct pcifront_device *pdev;
55};
56
57static inline struct pcifront_device *
58pcifront_get_pdev(struct pcifront_sd *sd)
59{
60 return sd->pdev;
61}
62
63static inline void pcifront_init_sd(struct pcifront_sd *sd,
64 unsigned int domain, unsigned int bus,
65 struct pcifront_device *pdev)
66{
67 sd->domain = domain;
68 sd->pdev = pdev;
69}
70
71static DEFINE_SPINLOCK(pcifront_dev_lock);
72static struct pcifront_device *pcifront_dev;
73
74static int verbose_request;
75module_param(verbose_request, int, 0644);
76
77static int errno_to_pcibios_err(int errno)
78{
79 switch (errno) {
80 case XEN_PCI_ERR_success:
81 return PCIBIOS_SUCCESSFUL;
82
83 case XEN_PCI_ERR_dev_not_found:
84 return PCIBIOS_DEVICE_NOT_FOUND;
85
86 case XEN_PCI_ERR_invalid_offset:
87 case XEN_PCI_ERR_op_failed:
88 return PCIBIOS_BAD_REGISTER_NUMBER;
89
90 case XEN_PCI_ERR_not_implemented:
91 return PCIBIOS_FUNC_NOT_SUPPORTED;
92
93 case XEN_PCI_ERR_access_denied:
94 return PCIBIOS_SET_FAILED;
95 }
96 return errno;
97}
98
99static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev)
100{
101 if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags)
102 && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) {
103 dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n");
104 schedule_work(&pdev->op_work);
105 }
106}
107
108static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
109{
110 int err = 0;
111 struct xen_pci_op *active_op = &pdev->sh_info->op;
112 unsigned long irq_flags;
113 evtchn_port_t port = pdev->evtchn;
114 unsigned irq = pdev->irq;
115 s64 ns, ns_timeout;
116 struct timeval tv;
117
118 spin_lock_irqsave(&pdev->sh_info_lock, irq_flags);
119
120 memcpy(active_op, op, sizeof(struct xen_pci_op));
121
122 /* Go */
123 wmb();
124 set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
125 notify_remote_via_evtchn(port);
126
127 /*
128 * We set a poll timeout of 3 seconds but give up on return after
129 * 2 seconds. It is better to time out too late rather than too early
130 * (in the latter case we end up continually re-executing poll() with a
131 * timeout in the past). 1s difference gives plenty of slack for error.
132 */
133 do_gettimeofday(&tv);
134 ns_timeout = timeval_to_ns(&tv) + 2 * (s64)NSEC_PER_SEC;
135
136 xen_clear_irq_pending(irq);
137
138 while (test_bit(_XEN_PCIF_active,
139 (unsigned long *)&pdev->sh_info->flags)) {
140 xen_poll_irq_timeout(irq, jiffies + 3*HZ);
141 xen_clear_irq_pending(irq);
142 do_gettimeofday(&tv);
143 ns = timeval_to_ns(&tv);
144 if (ns > ns_timeout) {
145 dev_err(&pdev->xdev->dev,
146 "pciback not responding!!!\n");
147 clear_bit(_XEN_PCIF_active,
148 (unsigned long *)&pdev->sh_info->flags);
149 err = XEN_PCI_ERR_dev_not_found;
150 goto out;
151 }
152 }
153
154 /*
155 * We might lose backend service request since we
156 * reuse same evtchn with pci_conf backend response. So re-schedule
157 * aer pcifront service.
158 */
159 if (test_bit(_XEN_PCIB_active,
160 (unsigned long *)&pdev->sh_info->flags)) {
161 dev_err(&pdev->xdev->dev,
162 "schedule aer pcifront service\n");
163 schedule_pcifront_aer_op(pdev);
164 }
165
166 memcpy(op, active_op, sizeof(struct xen_pci_op));
167
168 err = op->err;
169out:
170 spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags);
171 return err;
172}
173
174/* Access to this function is spinlocked in drivers/pci/access.c */
175static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn,
176 int where, int size, u32 *val)
177{
178 int err = 0;
179 struct xen_pci_op op = {
180 .cmd = XEN_PCI_OP_conf_read,
181 .domain = pci_domain_nr(bus),
182 .bus = bus->number,
183 .devfn = devfn,
184 .offset = where,
185 .size = size,
186 };
187 struct pcifront_sd *sd = bus->sysdata;
188 struct pcifront_device *pdev = pcifront_get_pdev(sd);
189
190 if (verbose_request)
191 dev_info(&pdev->xdev->dev,
192 "read dev=%04x:%02x:%02x.%01x - offset %x size %d\n",
193 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
194 PCI_FUNC(devfn), where, size);
195
196 err = do_pci_op(pdev, &op);
197
198 if (likely(!err)) {
199 if (verbose_request)
200 dev_info(&pdev->xdev->dev, "read got back value %x\n",
201 op.value);
202
203 *val = op.value;
204 } else if (err == -ENODEV) {
205 /* No device here, pretend that it just returned 0 */
206 err = 0;
207 *val = 0;
208 }
209
210 return errno_to_pcibios_err(err);
211}
212
213/* Access to this function is spinlocked in drivers/pci/access.c */
214static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn,
215 int where, int size, u32 val)
216{
217 struct xen_pci_op op = {
218 .cmd = XEN_PCI_OP_conf_write,
219 .domain = pci_domain_nr(bus),
220 .bus = bus->number,
221 .devfn = devfn,
222 .offset = where,
223 .size = size,
224 .value = val,
225 };
226 struct pcifront_sd *sd = bus->sysdata;
227 struct pcifront_device *pdev = pcifront_get_pdev(sd);
228
229 if (verbose_request)
230 dev_info(&pdev->xdev->dev,
231 "write dev=%04x:%02x:%02x.%01x - "
232 "offset %x size %d val %x\n",
233 pci_domain_nr(bus), bus->number,
234 PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
235
236 return errno_to_pcibios_err(do_pci_op(pdev, &op));
237}
238
239struct pci_ops pcifront_bus_ops = {
240 .read = pcifront_bus_read,
241 .write = pcifront_bus_write,
242};
243
244#ifdef CONFIG_PCI_MSI
245static int pci_frontend_enable_msix(struct pci_dev *dev,
246 int **vector, int nvec)
247{
248 int err;
249 int i;
250 struct xen_pci_op op = {
251 .cmd = XEN_PCI_OP_enable_msix,
252 .domain = pci_domain_nr(dev->bus),
253 .bus = dev->bus->number,
254 .devfn = dev->devfn,
255 .value = nvec,
256 };
257 struct pcifront_sd *sd = dev->bus->sysdata;
258 struct pcifront_device *pdev = pcifront_get_pdev(sd);
259 struct msi_desc *entry;
260
261 if (nvec > SH_INFO_MAX_VEC) {
262 dev_err(&dev->dev, "too much vector for pci frontend: %x."
263 " Increase SH_INFO_MAX_VEC.\n", nvec);
264 return -EINVAL;
265 }
266
267 i = 0;
268 list_for_each_entry(entry, &dev->msi_list, list) {
269 op.msix_entries[i].entry = entry->msi_attrib.entry_nr;
270 /* Vector is useless at this point. */
271 op.msix_entries[i].vector = -1;
272 i++;
273 }
274
275 err = do_pci_op(pdev, &op);
276
277 if (likely(!err)) {
278 if (likely(!op.value)) {
279 /* we get the result */
280 for (i = 0; i < nvec; i++)
281 *(*vector+i) = op.msix_entries[i].vector;
282 return 0;
283 } else {
284 printk(KERN_DEBUG "enable msix get value %x\n",
285 op.value);
286 return op.value;
287 }
288 } else {
289 dev_err(&dev->dev, "enable msix get err %x\n", err);
290 return err;
291 }
292}
293
294static void pci_frontend_disable_msix(struct pci_dev *dev)
295{
296 int err;
297 struct xen_pci_op op = {
298 .cmd = XEN_PCI_OP_disable_msix,
299 .domain = pci_domain_nr(dev->bus),
300 .bus = dev->bus->number,
301 .devfn = dev->devfn,
302 };
303 struct pcifront_sd *sd = dev->bus->sysdata;
304 struct pcifront_device *pdev = pcifront_get_pdev(sd);
305
306 err = do_pci_op(pdev, &op);
307
308 /* What should do for error ? */
309 if (err)
310 dev_err(&dev->dev, "pci_disable_msix get err %x\n", err);
311}
312
313static int pci_frontend_enable_msi(struct pci_dev *dev, int **vector)
314{
315 int err;
316 struct xen_pci_op op = {
317 .cmd = XEN_PCI_OP_enable_msi,
318 .domain = pci_domain_nr(dev->bus),
319 .bus = dev->bus->number,
320 .devfn = dev->devfn,
321 };
322 struct pcifront_sd *sd = dev->bus->sysdata;
323 struct pcifront_device *pdev = pcifront_get_pdev(sd);
324
325 err = do_pci_op(pdev, &op);
326 if (likely(!err)) {
327 *(*vector) = op.value;
328 } else {
329 dev_err(&dev->dev, "pci frontend enable msi failed for dev "
330 "%x:%x\n", op.bus, op.devfn);
331 err = -EINVAL;
332 }
333 return err;
334}
335
336static void pci_frontend_disable_msi(struct pci_dev *dev)
337{
338 int err;
339 struct xen_pci_op op = {
340 .cmd = XEN_PCI_OP_disable_msi,
341 .domain = pci_domain_nr(dev->bus),
342 .bus = dev->bus->number,
343 .devfn = dev->devfn,
344 };
345 struct pcifront_sd *sd = dev->bus->sysdata;
346 struct pcifront_device *pdev = pcifront_get_pdev(sd);
347
348 err = do_pci_op(pdev, &op);
349 if (err == XEN_PCI_ERR_dev_not_found) {
350 /* XXX No response from backend, what shall we do? */
351 printk(KERN_DEBUG "get no response from backend for disable MSI\n");
352 return;
353 }
354 if (err)
355 /* how can pciback notify us fail? */
356 printk(KERN_DEBUG "get fake response frombackend\n");
357}
358
359static struct xen_pci_frontend_ops pci_frontend_ops = {
360 .enable_msi = pci_frontend_enable_msi,
361 .disable_msi = pci_frontend_disable_msi,
362 .enable_msix = pci_frontend_enable_msix,
363 .disable_msix = pci_frontend_disable_msix,
364};
365
366static void pci_frontend_registrar(int enable)
367{
368 if (enable)
369 xen_pci_frontend = &pci_frontend_ops;
370 else
371 xen_pci_frontend = NULL;
372};
373#else
374static inline void pci_frontend_registrar(int enable) { };
375#endif /* CONFIG_PCI_MSI */
376
377/* Claim resources for the PCI frontend as-is, backend won't allow changes */
378static int pcifront_claim_resource(struct pci_dev *dev, void *data)
379{
380 struct pcifront_device *pdev = data;
381 int i;
382 struct resource *r;
383
384 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
385 r = &dev->resource[i];
386
387 if (!r->parent && r->start && r->flags) {
388 dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n",
389 pci_name(dev), i);
390 if (pci_claim_resource(dev, i)) {
391 dev_err(&pdev->xdev->dev, "Could not claim "
392 "resource %s/%d! Device offline. Try "
393 "giving less than 4GB to domain.\n",
394 pci_name(dev), i);
395 }
396 }
397 }
398
399 return 0;
400}
401
402static int __devinit pcifront_scan_bus(struct pcifront_device *pdev,
403 unsigned int domain, unsigned int bus,
404 struct pci_bus *b)
405{
406 struct pci_dev *d;
407 unsigned int devfn;
408
409 /* Scan the bus for functions and add.
410 * We omit handling of PCI bridge attachment because pciback prevents
411 * bridges from being exported.
412 */
413 for (devfn = 0; devfn < 0x100; devfn++) {
414 d = pci_get_slot(b, devfn);
415 if (d) {
416 /* Device is already known. */
417 pci_dev_put(d);
418 continue;
419 }
420
421 d = pci_scan_single_device(b, devfn);
422 if (d)
423 dev_info(&pdev->xdev->dev, "New device on "
424 "%04x:%02x:%02x.%02x found.\n", domain, bus,
425 PCI_SLOT(devfn), PCI_FUNC(devfn));
426 }
427
428 return 0;
429}
430
431static int __devinit pcifront_scan_root(struct pcifront_device *pdev,
432 unsigned int domain, unsigned int bus)
433{
434 struct pci_bus *b;
435 struct pcifront_sd *sd = NULL;
436 struct pci_bus_entry *bus_entry = NULL;
437 int err = 0;
438
439#ifndef CONFIG_PCI_DOMAINS
440 if (domain != 0) {
441 dev_err(&pdev->xdev->dev,
442 "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
443 dev_err(&pdev->xdev->dev,
444 "Please compile with CONFIG_PCI_DOMAINS\n");
445 err = -EINVAL;
446 goto err_out;
447 }
448#endif
449
450 dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n",
451 domain, bus);
452
453 bus_entry = kmalloc(sizeof(*bus_entry), GFP_KERNEL);
454 sd = kmalloc(sizeof(*sd), GFP_KERNEL);
455 if (!bus_entry || !sd) {
456 err = -ENOMEM;
457 goto err_out;
458 }
459 pcifront_init_sd(sd, domain, bus, pdev);
460
461 b = pci_scan_bus_parented(&pdev->xdev->dev, bus,
462 &pcifront_bus_ops, sd);
463 if (!b) {
464 dev_err(&pdev->xdev->dev,
465 "Error creating PCI Frontend Bus!\n");
466 err = -ENOMEM;
467 goto err_out;
468 }
469
470 bus_entry->bus = b;
471
472 list_add(&bus_entry->list, &pdev->root_buses);
473
474 /* pci_scan_bus_parented skips devices which do not have a have
475 * devfn==0. The pcifront_scan_bus enumerates all devfn. */
476 err = pcifront_scan_bus(pdev, domain, bus, b);
477
478 /* Claim resources before going "live" with our devices */
479 pci_walk_bus(b, pcifront_claim_resource, pdev);
480
481 /* Create SysFS and notify udev of the devices. Aka: "going live" */
482 pci_bus_add_devices(b);
483
484 return err;
485
486err_out:
487 kfree(bus_entry);
488 kfree(sd);
489
490 return err;
491}
492
493static int __devinit pcifront_rescan_root(struct pcifront_device *pdev,
494 unsigned int domain, unsigned int bus)
495{
496 int err;
497 struct pci_bus *b;
498
499#ifndef CONFIG_PCI_DOMAINS
500 if (domain != 0) {
501 dev_err(&pdev->xdev->dev,
502 "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
503 dev_err(&pdev->xdev->dev,
504 "Please compile with CONFIG_PCI_DOMAINS\n");
505 return -EINVAL;
506 }
507#endif
508
509 dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n",
510 domain, bus);
511
512 b = pci_find_bus(domain, bus);
513 if (!b)
514 /* If the bus is unknown, create it. */
515 return pcifront_scan_root(pdev, domain, bus);
516
517 err = pcifront_scan_bus(pdev, domain, bus, b);
518
519 /* Claim resources before going "live" with our devices */
520 pci_walk_bus(b, pcifront_claim_resource, pdev);
521
522 /* Create SysFS and notify udev of the devices. Aka: "going live" */
523 pci_bus_add_devices(b);
524
525 return err;
526}
527
528static void free_root_bus_devs(struct pci_bus *bus)
529{
530 struct pci_dev *dev;
531
532 while (!list_empty(&bus->devices)) {
533 dev = container_of(bus->devices.next, struct pci_dev,
534 bus_list);
535 dev_dbg(&dev->dev, "removing device\n");
536 pci_remove_bus_device(dev);
537 }
538}
539
540static void pcifront_free_roots(struct pcifront_device *pdev)
541{
542 struct pci_bus_entry *bus_entry, *t;
543
544 dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n");
545
546 list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) {
547 list_del(&bus_entry->list);
548
549 free_root_bus_devs(bus_entry->bus);
550
551 kfree(bus_entry->bus->sysdata);
552
553 device_unregister(bus_entry->bus->bridge);
554 pci_remove_bus(bus_entry->bus);
555
556 kfree(bus_entry);
557 }
558}
559
560static pci_ers_result_t pcifront_common_process(int cmd,
561 struct pcifront_device *pdev,
562 pci_channel_state_t state)
563{
564 pci_ers_result_t result;
565 struct pci_driver *pdrv;
566 int bus = pdev->sh_info->aer_op.bus;
567 int devfn = pdev->sh_info->aer_op.devfn;
568 struct pci_dev *pcidev;
569 int flag = 0;
570
571 dev_dbg(&pdev->xdev->dev,
572 "pcifront AER process: cmd %x (bus:%x, devfn%x)",
573 cmd, bus, devfn);
574 result = PCI_ERS_RESULT_NONE;
575
576 pcidev = pci_get_bus_and_slot(bus, devfn);
577 if (!pcidev || !pcidev->driver) {
2a63dd72
JS		 578 dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
579 if (pcidev)
580 pci_dev_put(pcidev);
956a9202
RW		 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
624static 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
654static 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}
660static 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
679static 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}
691static 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);
726out:
727 return pdev;
728}
729
730static 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
db2e2e6e 736 cancel_work_sync(&pdev->op_work);
956a9202
RW		 737
738 if (pdev->irq >= 0)
739 unbind_from_irqhandler(pdev->irq, pdev);
740
741 if (pdev->evtchn != INVALID_EVTCHN)
742 xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
743
744 if (pdev->gnt_ref != INVALID_GRANT_REF)
745 gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */,
746 (unsigned long)pdev->sh_info);
747 else
748 free_page((unsigned long)pdev->sh_info);
749
750 dev_set_drvdata(&pdev->xdev->dev, NULL);
751
752 kfree(pdev);
753}
754
755static int pcifront_publish_info(struct pcifront_device *pdev)
756{
757 int err = 0;
758 struct xenbus_transaction trans;
759
760 err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info));
761 if (err < 0)
762 goto out;
763
764 pdev->gnt_ref = err;
765
766 err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);
767 if (err)
768 goto out;
769
770 err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer,
771 0, "pcifront", pdev);
772
773 if (err < 0)
774 return err;
775
776 pdev->irq = err;
777
778do_publish:
779 err = xenbus_transaction_start(&trans);
780 if (err) {
781 xenbus_dev_fatal(pdev->xdev, err,
782 "Error writing configuration for backend "
783 "(start transaction)");
784 goto out;
785 }
786
787 err = xenbus_printf(trans, pdev->xdev->nodename,
788 "pci-op-ref", "%u", pdev->gnt_ref);
789 if (!err)
790 err = xenbus_printf(trans, pdev->xdev->nodename,
791 "event-channel", "%u", pdev->evtchn);
792 if (!err)
793 err = xenbus_printf(trans, pdev->xdev->nodename,
794 "magic", XEN_PCI_MAGIC);
795
796 if (err) {
797 xenbus_transaction_end(trans, 1);
798 xenbus_dev_fatal(pdev->xdev, err,
799 "Error writing configuration for backend");
800 goto out;
801 } else {
802 err = xenbus_transaction_end(trans, 0);
803 if (err == -EAGAIN)
804 goto do_publish;
805 else if (err) {
806 xenbus_dev_fatal(pdev->xdev, err,
807 "Error completing transaction "
808 "for backend");
809 goto out;
810 }
811 }
812
813 xenbus_switch_state(pdev->xdev, XenbusStateInitialised);
814
815 dev_dbg(&pdev->xdev->dev, "publishing successful!\n");
816
817out:
818 return err;
819}
820
821static int __devinit pcifront_try_connect(struct pcifront_device *pdev)
822{
823 int err = -EFAULT;
824 int i, num_roots, len;
825 char str[64];
826 unsigned int domain, bus;
827
828
829 /* Only connect once */
830 if (xenbus_read_driver_state(pdev->xdev->nodename) !=
831 XenbusStateInitialised)
832 goto out;
833
834 err = pcifront_connect(pdev);
835 if (err) {
836 xenbus_dev_fatal(pdev->xdev, err,
837 "Error connecting PCI Frontend");
838 goto out;
839 }
840
841 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
842 "root_num", "%d", &num_roots);
843 if (err == -ENOENT) {
844 xenbus_dev_error(pdev->xdev, err,
845 "No PCI Roots found, trying 0000:00");
846 err = pcifront_scan_root(pdev, 0, 0);
847 num_roots = 0;
848 } else if (err != 1) {
849 if (err == 0)
850 err = -EINVAL;
851 xenbus_dev_fatal(pdev->xdev, err,
852 "Error reading number of PCI roots");
853 goto out;
854 }
855
856 for (i = 0; i < num_roots; i++) {
857 len = snprintf(str, sizeof(str), "root-%d", i);
858 if (unlikely(len >= (sizeof(str) - 1))) {
859 err = -ENOMEM;
860 goto out;
861 }
862
863 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
864 "%x:%x", &domain, &bus);
865 if (err != 2) {
866 if (err >= 0)
867 err = -EINVAL;
868 xenbus_dev_fatal(pdev->xdev, err,
869 "Error reading PCI root %d", i);
870 goto out;
871 }
872
873 err = pcifront_scan_root(pdev, domain, bus);
874 if (err) {
875 xenbus_dev_fatal(pdev->xdev, err,
876 "Error scanning PCI root %04x:%02x",
877 domain, bus);
878 goto out;
879 }
880 }
881
882 err = xenbus_switch_state(pdev->xdev, XenbusStateConnected);
883
884out:
885 return err;
886}
887
888static int pcifront_try_disconnect(struct pcifront_device *pdev)
889{
890 int err = 0;
891 enum xenbus_state prev_state;
892
893
894 prev_state = xenbus_read_driver_state(pdev->xdev->nodename);
895
896 if (prev_state >= XenbusStateClosing)
897 goto out;
898
899 if (prev_state == XenbusStateConnected) {
900 pcifront_free_roots(pdev);
901 pcifront_disconnect(pdev);
902 }
903
904 err = xenbus_switch_state(pdev->xdev, XenbusStateClosed);
905
906out:
907
908 return err;
909}
910
911static int __devinit pcifront_attach_devices(struct pcifront_device *pdev)
912{
913 int err = -EFAULT;
914 int i, num_roots, len;
915 unsigned int domain, bus;
916 char str[64];
917
918 if (xenbus_read_driver_state(pdev->xdev->nodename) !=
919 XenbusStateReconfiguring)
920 goto out;
921
922 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
923 "root_num", "%d", &num_roots);
924 if (err == -ENOENT) {
925 xenbus_dev_error(pdev->xdev, err,
926 "No PCI Roots found, trying 0000:00");
927 err = pcifront_rescan_root(pdev, 0, 0);
928 num_roots = 0;
929 } else if (err != 1) {
930 if (err == 0)
931 err = -EINVAL;
932 xenbus_dev_fatal(pdev->xdev, err,
933 "Error reading number of PCI roots");
934 goto out;
935 }
936
937 for (i = 0; i < num_roots; i++) {
938 len = snprintf(str, sizeof(str), "root-%d", i);
939 if (unlikely(len >= (sizeof(str) - 1))) {
940 err = -ENOMEM;
941 goto out;
942 }
943
944 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
945 "%x:%x", &domain, &bus);
946 if (err != 2) {
947 if (err >= 0)
948 err = -EINVAL;
949 xenbus_dev_fatal(pdev->xdev, err,
950 "Error reading PCI root %d", i);
951 goto out;
952 }
953
954 err = pcifront_rescan_root(pdev, domain, bus);
955 if (err) {
956 xenbus_dev_fatal(pdev->xdev, err,
957 "Error scanning PCI root %04x:%02x",
958 domain, bus);
959 goto out;
960 }
961 }
962
963 xenbus_switch_state(pdev->xdev, XenbusStateConnected);
964
965out:
966 return err;
967}
968
969static int pcifront_detach_devices(struct pcifront_device *pdev)
970{
971 int err = 0;
972 int i, num_devs;
973 unsigned int domain, bus, slot, func;
974 struct pci_bus *pci_bus;
975 struct pci_dev *pci_dev;
976 char str[64];
977
978 if (xenbus_read_driver_state(pdev->xdev->nodename) !=
979 XenbusStateConnected)
980 goto out;
981
982 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d",
983 &num_devs);
984 if (err != 1) {
985 if (err >= 0)
986 err = -EINVAL;
987 xenbus_dev_fatal(pdev->xdev, err,
988 "Error reading number of PCI devices");
989 goto out;
990 }
991
992 /* Find devices being detached and remove them. */
993 for (i = 0; i < num_devs; i++) {
994 int l, state;
995 l = snprintf(str, sizeof(str), "state-%d", i);
996 if (unlikely(l >= (sizeof(str) - 1))) {
997 err = -ENOMEM;
998 goto out;
999 }
1000 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d",
1001 &state);
1002 if (err != 1)
1003 state = XenbusStateUnknown;
1004
1005 if (state != XenbusStateClosing)
1006 continue;
1007
1008 /* Remove device. */
1009 l = snprintf(str, sizeof(str), "vdev-%d", i);
1010 if (unlikely(l >= (sizeof(str) - 1))) {
1011 err = -ENOMEM;
1012 goto out;
1013 }
1014 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
1015 "%x:%x:%x.%x", &domain, &bus, &slot, &func);
1016 if (err != 4) {
1017 if (err >= 0)
1018 err = -EINVAL;
1019 xenbus_dev_fatal(pdev->xdev, err,
1020 "Error reading PCI device %d", i);
1021 goto out;
1022 }
1023
1024 pci_bus = pci_find_bus(domain, bus);
1025 if (!pci_bus) {
1026 dev_dbg(&pdev->xdev->dev, "Cannot get bus %04x:%02x\n",
1027 domain, bus);
1028 continue;
1029 }
1030 pci_dev = pci_get_slot(pci_bus, PCI_DEVFN(slot, func));
1031 if (!pci_dev) {
1032 dev_dbg(&pdev->xdev->dev,
1033 "Cannot get PCI device %04x:%02x:%02x.%02x\n",
1034 domain, bus, slot, func);
1035 continue;
1036 }
1037 pci_remove_bus_device(pci_dev);
1038 pci_dev_put(pci_dev);
1039
1040 dev_dbg(&pdev->xdev->dev,
1041 "PCI device %04x:%02x:%02x.%02x removed.\n",
1042 domain, bus, slot, func);
1043 }
1044
1045 err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring);
1046
1047out:
1048 return err;
1049}
1050
1051static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev,
1052 enum xenbus_state be_state)
1053{
1054 struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
1055
1056 switch (be_state) {
1057 case XenbusStateUnknown:
1058 case XenbusStateInitialising:
1059 case XenbusStateInitWait:
1060 case XenbusStateInitialised:
1061 case XenbusStateClosed:
1062 break;
1063
1064 case XenbusStateConnected:
1065 pcifront_try_connect(pdev);
1066 break;
1067
1068 case XenbusStateClosing:
1069 dev_warn(&xdev->dev, "backend going away!\n");
1070 pcifront_try_disconnect(pdev);
1071 break;
1072
1073 case XenbusStateReconfiguring:
1074 pcifront_detach_devices(pdev);
1075 break;
1076
1077 case XenbusStateReconfigured:
1078 pcifront_attach_devices(pdev);
1079 break;
1080 }
1081}
1082
1083static int pcifront_xenbus_probe(struct xenbus_device *xdev,
1084 const struct xenbus_device_id *id)
1085{
1086 int err = 0;
1087 struct pcifront_device *pdev = alloc_pdev(xdev);
1088
1089 if (pdev == NULL) {
1090 err = -ENOMEM;
1091 xenbus_dev_fatal(xdev, err,
1092 "Error allocating pcifront_device struct");
1093 goto out;
1094 }
1095
1096 err = pcifront_publish_info(pdev);
1097 if (err)
1098 free_pdev(pdev);
1099
1100out:
1101 return err;
1102}
1103
1104static int pcifront_xenbus_remove(struct xenbus_device *xdev)
1105{
1106 struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
1107 if (pdev)
1108 free_pdev(pdev);
1109
1110 return 0;
1111}
1112
1113static const struct xenbus_device_id xenpci_ids[] = {
1114 {"pci"},
1115 {""},
1116};
1117
1118static struct xenbus_driver xenbus_pcifront_driver = {
1119 .name = "pcifront",
1120 .owner = THIS_MODULE,
1121 .ids = xenpci_ids,
1122 .probe = pcifront_xenbus_probe,
1123 .remove = pcifront_xenbus_remove,
1124 .otherend_changed = pcifront_backend_changed,
1125};
1126
1127static int __init pcifront_init(void)
1128{
1129 if (!xen_pv_domain() || xen_initial_domain())
1130 return -ENODEV;
1131
1132 pci_frontend_registrar(1 /* enable */);
1133
1134 return xenbus_register_frontend(&xenbus_pcifront_driver);
1135}
1136
1137static void __exit pcifront_cleanup(void)
1138{
1139 xenbus_unregister_driver(&xenbus_pcifront_driver);
1140 pci_frontend_registrar(0 /* disable */);
1141}
1142module_init(pcifront_init);
1143module_exit(pcifront_cleanup);
1144
1145MODULE_DESCRIPTION("Xen PCI passthrough frontend.");
1146MODULE_LICENSE("GPL");
1147MODULE_ALIAS("xen:pci");
kernel source for telekom puls (alcatel/mediatek)