blob: 7cfd2db02deb3c5502227676a9a99154244b18e4 [file] [log] [blame]
Ryan Wilson956a9202010-08-02 21:31:05 -04001/*
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>
Ryan Wilson956a9202010-08-02 21:31:05 -040016#include <xen/interface/io/pciif.h>
17#include <asm/xen/pci.h>
18#include <linux/interrupt.h>
Arun Sharma600634972011-07-26 16:09:06 -070019#include <linux/atomic.h>
Ryan Wilson956a9202010-08-02 21:31:05 -040020#include <linux/workqueue.h>
21#include <linux/bitops.h>
22#include <linux/time.h>
Konrad Rzeszutek Wilk51c71a32013-11-26 15:05:40 -050023#include <xen/platform_pci.h>
Ryan Wilson956a9202010-08-02 21:31:05 -040024
Konrad Rzeszutek Wilk3d925322012-07-31 06:26:59 -040025#include <asm/xen/swiotlb-xen.h>
Ryan Wilson956a9202010-08-02 21:31:05 -040026#define INVALID_GRANT_REF (0)
27#define INVALID_EVTCHN (-1)
28
29struct pci_bus_entry {
30 struct list_head list;
31 struct pci_bus *bus;
32};
33
34#define _PDEVB_op_active (0)
35#define PDEVB_op_active (1 << (_PDEVB_op_active))
36
37struct pcifront_device {
38 struct xenbus_device *xdev;
39 struct list_head root_buses;
40
41 int evtchn;
42 int gnt_ref;
43
44 int irq;
45
46 /* Lock this when doing any operations in sh_info */
47 spinlock_t sh_info_lock;
48 struct xen_pci_sharedinfo *sh_info;
49 struct work_struct op_work;
50 unsigned long flags;
51
52};
53
54struct pcifront_sd {
55 int domain;
56 struct pcifront_device *pdev;
57};
58
59static inline struct pcifront_device *
60pcifront_get_pdev(struct pcifront_sd *sd)
61{
62 return sd->pdev;
63}
64
65static inline void pcifront_init_sd(struct pcifront_sd *sd,
66 unsigned int domain, unsigned int bus,
67 struct pcifront_device *pdev)
68{
69 sd->domain = domain;
70 sd->pdev = pdev;
71}
72
73static DEFINE_SPINLOCK(pcifront_dev_lock);
74static struct pcifront_device *pcifront_dev;
75
76static int verbose_request;
77module_param(verbose_request, int, 0644);
78
79static int errno_to_pcibios_err(int errno)
80{
81 switch (errno) {
82 case XEN_PCI_ERR_success:
83 return PCIBIOS_SUCCESSFUL;
84
85 case XEN_PCI_ERR_dev_not_found:
86 return PCIBIOS_DEVICE_NOT_FOUND;
87
88 case XEN_PCI_ERR_invalid_offset:
89 case XEN_PCI_ERR_op_failed:
90 return PCIBIOS_BAD_REGISTER_NUMBER;
91
92 case XEN_PCI_ERR_not_implemented:
93 return PCIBIOS_FUNC_NOT_SUPPORTED;
94
95 case XEN_PCI_ERR_access_denied:
96 return PCIBIOS_SET_FAILED;
97 }
98 return errno;
99}
100
101static inline void schedule_pcifront_aer_op(struct pcifront_device *pdev)
102{
103 if (test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags)
104 && !test_and_set_bit(_PDEVB_op_active, &pdev->flags)) {
105 dev_dbg(&pdev->xdev->dev, "schedule aer frontend job\n");
106 schedule_work(&pdev->op_work);
107 }
108}
109
110static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
111{
112 int err = 0;
113 struct xen_pci_op *active_op = &pdev->sh_info->op;
114 unsigned long irq_flags;
115 evtchn_port_t port = pdev->evtchn;
116 unsigned irq = pdev->irq;
117 s64 ns, ns_timeout;
118 struct timeval tv;
119
120 spin_lock_irqsave(&pdev->sh_info_lock, irq_flags);
121
122 memcpy(active_op, op, sizeof(struct xen_pci_op));
123
124 /* Go */
125 wmb();
126 set_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
127 notify_remote_via_evtchn(port);
128
129 /*
130 * We set a poll timeout of 3 seconds but give up on return after
131 * 2 seconds. It is better to time out too late rather than too early
132 * (in the latter case we end up continually re-executing poll() with a
133 * timeout in the past). 1s difference gives plenty of slack for error.
134 */
135 do_gettimeofday(&tv);
136 ns_timeout = timeval_to_ns(&tv) + 2 * (s64)NSEC_PER_SEC;
137
138 xen_clear_irq_pending(irq);
139
140 while (test_bit(_XEN_PCIF_active,
141 (unsigned long *)&pdev->sh_info->flags)) {
142 xen_poll_irq_timeout(irq, jiffies + 3*HZ);
143 xen_clear_irq_pending(irq);
144 do_gettimeofday(&tv);
145 ns = timeval_to_ns(&tv);
146 if (ns > ns_timeout) {
147 dev_err(&pdev->xdev->dev,
148 "pciback not responding!!!\n");
149 clear_bit(_XEN_PCIF_active,
150 (unsigned long *)&pdev->sh_info->flags);
151 err = XEN_PCI_ERR_dev_not_found;
152 goto out;
153 }
154 }
155
156 /*
157 * We might lose backend service request since we
158 * reuse same evtchn with pci_conf backend response. So re-schedule
159 * aer pcifront service.
160 */
161 if (test_bit(_XEN_PCIB_active,
162 (unsigned long *)&pdev->sh_info->flags)) {
163 dev_err(&pdev->xdev->dev,
164 "schedule aer pcifront service\n");
165 schedule_pcifront_aer_op(pdev);
166 }
167
168 memcpy(op, active_op, sizeof(struct xen_pci_op));
169
170 err = op->err;
171out:
172 spin_unlock_irqrestore(&pdev->sh_info_lock, irq_flags);
173 return err;
174}
175
176/* Access to this function is spinlocked in drivers/pci/access.c */
177static int pcifront_bus_read(struct pci_bus *bus, unsigned int devfn,
178 int where, int size, u32 *val)
179{
180 int err = 0;
181 struct xen_pci_op op = {
182 .cmd = XEN_PCI_OP_conf_read,
183 .domain = pci_domain_nr(bus),
184 .bus = bus->number,
185 .devfn = devfn,
186 .offset = where,
187 .size = size,
188 };
189 struct pcifront_sd *sd = bus->sysdata;
190 struct pcifront_device *pdev = pcifront_get_pdev(sd);
191
192 if (verbose_request)
193 dev_info(&pdev->xdev->dev,
Konrad Rzeszutek Wilke4de8662012-01-25 16:00:00 -0500194 "read dev=%04x:%02x:%02x.%d - offset %x size %d\n",
Ryan Wilson956a9202010-08-02 21:31:05 -0400195 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
196 PCI_FUNC(devfn), where, size);
197
198 err = do_pci_op(pdev, &op);
199
200 if (likely(!err)) {
201 if (verbose_request)
202 dev_info(&pdev->xdev->dev, "read got back value %x\n",
203 op.value);
204
205 *val = op.value;
206 } else if (err == -ENODEV) {
207 /* No device here, pretend that it just returned 0 */
208 err = 0;
209 *val = 0;
210 }
211
212 return errno_to_pcibios_err(err);
213}
214
215/* Access to this function is spinlocked in drivers/pci/access.c */
216static int pcifront_bus_write(struct pci_bus *bus, unsigned int devfn,
217 int where, int size, u32 val)
218{
219 struct xen_pci_op op = {
220 .cmd = XEN_PCI_OP_conf_write,
221 .domain = pci_domain_nr(bus),
222 .bus = bus->number,
223 .devfn = devfn,
224 .offset = where,
225 .size = size,
226 .value = val,
227 };
228 struct pcifront_sd *sd = bus->sysdata;
229 struct pcifront_device *pdev = pcifront_get_pdev(sd);
230
231 if (verbose_request)
232 dev_info(&pdev->xdev->dev,
Konrad Rzeszutek Wilke4de8662012-01-25 16:00:00 -0500233 "write dev=%04x:%02x:%02x.%d - "
Ryan Wilson956a9202010-08-02 21:31:05 -0400234 "offset %x size %d val %x\n",
235 pci_domain_nr(bus), bus->number,
236 PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
237
238 return errno_to_pcibios_err(do_pci_op(pdev, &op));
239}
240
Konrad Rzeszutek Wilkb8b0f552012-08-21 14:49:34 -0400241static struct pci_ops pcifront_bus_ops = {
Ryan Wilson956a9202010-08-02 21:31:05 -0400242 .read = pcifront_bus_read,
243 .write = pcifront_bus_write,
244};
245
246#ifdef CONFIG_PCI_MSI
247static int pci_frontend_enable_msix(struct pci_dev *dev,
Konrad Rzeszutek Wilkcc0f89c2011-02-17 12:02:23 -0500248 int vector[], int nvec)
Ryan Wilson956a9202010-08-02 21:31:05 -0400249{
250 int err;
251 int i;
252 struct xen_pci_op op = {
253 .cmd = XEN_PCI_OP_enable_msix,
254 .domain = pci_domain_nr(dev->bus),
255 .bus = dev->bus->number,
256 .devfn = dev->devfn,
257 .value = nvec,
258 };
259 struct pcifront_sd *sd = dev->bus->sysdata;
260 struct pcifront_device *pdev = pcifront_get_pdev(sd);
261 struct msi_desc *entry;
262
263 if (nvec > SH_INFO_MAX_VEC) {
264 dev_err(&dev->dev, "too much vector for pci frontend: %x."
265 " Increase SH_INFO_MAX_VEC.\n", nvec);
266 return -EINVAL;
267 }
268
269 i = 0;
270 list_for_each_entry(entry, &dev->msi_list, list) {
271 op.msix_entries[i].entry = entry->msi_attrib.entry_nr;
272 /* Vector is useless at this point. */
273 op.msix_entries[i].vector = -1;
274 i++;
275 }
276
277 err = do_pci_op(pdev, &op);
278
279 if (likely(!err)) {
280 if (likely(!op.value)) {
281 /* we get the result */
Konrad Rzeszutek Wilk1d461052011-02-16 13:43:22 -0500282 for (i = 0; i < nvec; i++) {
283 if (op.msix_entries[i].vector <= 0) {
284 dev_warn(&dev->dev, "MSI-X entry %d is invalid: %d!\n",
285 i, op.msix_entries[i].vector);
286 err = -EINVAL;
Konrad Rzeszutek Wilkcc0f89c2011-02-17 12:02:23 -0500287 vector[i] = -1;
Konrad Rzeszutek Wilk1d461052011-02-16 13:43:22 -0500288 continue;
289 }
Konrad Rzeszutek Wilkcc0f89c2011-02-17 12:02:23 -0500290 vector[i] = op.msix_entries[i].vector;
Konrad Rzeszutek Wilk1d461052011-02-16 13:43:22 -0500291 }
Ryan Wilson956a9202010-08-02 21:31:05 -0400292 } else {
293 printk(KERN_DEBUG "enable msix get value %x\n",
294 op.value);
Jan Beulichf09d8432012-04-02 15:22:39 +0100295 err = op.value;
Ryan Wilson956a9202010-08-02 21:31:05 -0400296 }
297 } else {
298 dev_err(&dev->dev, "enable msix get err %x\n", err);
Ryan Wilson956a9202010-08-02 21:31:05 -0400299 }
Konrad Rzeszutek Wilk1d461052011-02-16 13:43:22 -0500300 return err;
Ryan Wilson956a9202010-08-02 21:31:05 -0400301}
302
303static void pci_frontend_disable_msix(struct pci_dev *dev)
304{
305 int err;
306 struct xen_pci_op op = {
307 .cmd = XEN_PCI_OP_disable_msix,
308 .domain = pci_domain_nr(dev->bus),
309 .bus = dev->bus->number,
310 .devfn = dev->devfn,
311 };
312 struct pcifront_sd *sd = dev->bus->sysdata;
313 struct pcifront_device *pdev = pcifront_get_pdev(sd);
314
315 err = do_pci_op(pdev, &op);
316
317 /* What should do for error ? */
318 if (err)
319 dev_err(&dev->dev, "pci_disable_msix get err %x\n", err);
320}
321
Konrad Rzeszutek Wilkcc0f89c2011-02-17 12:02:23 -0500322static int pci_frontend_enable_msi(struct pci_dev *dev, int vector[])
Ryan Wilson956a9202010-08-02 21:31:05 -0400323{
324 int err;
325 struct xen_pci_op op = {
326 .cmd = XEN_PCI_OP_enable_msi,
327 .domain = pci_domain_nr(dev->bus),
328 .bus = dev->bus->number,
329 .devfn = dev->devfn,
330 };
331 struct pcifront_sd *sd = dev->bus->sysdata;
332 struct pcifront_device *pdev = pcifront_get_pdev(sd);
333
334 err = do_pci_op(pdev, &op);
335 if (likely(!err)) {
Konrad Rzeszutek Wilkcc0f89c2011-02-17 12:02:23 -0500336 vector[0] = op.value;
Konrad Rzeszutek Wilk1d461052011-02-16 13:43:22 -0500337 if (op.value <= 0) {
338 dev_warn(&dev->dev, "MSI entry is invalid: %d!\n",
339 op.value);
340 err = -EINVAL;
Konrad Rzeszutek Wilkcc0f89c2011-02-17 12:02:23 -0500341 vector[0] = -1;
Konrad Rzeszutek Wilk1d461052011-02-16 13:43:22 -0500342 }
Ryan Wilson956a9202010-08-02 21:31:05 -0400343 } else {
344 dev_err(&dev->dev, "pci frontend enable msi failed for dev "
345 "%x:%x\n", op.bus, op.devfn);
346 err = -EINVAL;
347 }
348 return err;
349}
350
351static void pci_frontend_disable_msi(struct pci_dev *dev)
352{
353 int err;
354 struct xen_pci_op op = {
355 .cmd = XEN_PCI_OP_disable_msi,
356 .domain = pci_domain_nr(dev->bus),
357 .bus = dev->bus->number,
358 .devfn = dev->devfn,
359 };
360 struct pcifront_sd *sd = dev->bus->sysdata;
361 struct pcifront_device *pdev = pcifront_get_pdev(sd);
362
363 err = do_pci_op(pdev, &op);
364 if (err == XEN_PCI_ERR_dev_not_found) {
365 /* XXX No response from backend, what shall we do? */
366 printk(KERN_DEBUG "get no response from backend for disable MSI\n");
367 return;
368 }
369 if (err)
370 /* how can pciback notify us fail? */
371 printk(KERN_DEBUG "get fake response frombackend\n");
372}
373
374static struct xen_pci_frontend_ops pci_frontend_ops = {
375 .enable_msi = pci_frontend_enable_msi,
376 .disable_msi = pci_frontend_disable_msi,
377 .enable_msix = pci_frontend_enable_msix,
378 .disable_msix = pci_frontend_disable_msix,
379};
380
381static void pci_frontend_registrar(int enable)
382{
383 if (enable)
384 xen_pci_frontend = &pci_frontend_ops;
385 else
386 xen_pci_frontend = NULL;
387};
388#else
389static inline void pci_frontend_registrar(int enable) { };
390#endif /* CONFIG_PCI_MSI */
391
392/* Claim resources for the PCI frontend as-is, backend won't allow changes */
393static int pcifront_claim_resource(struct pci_dev *dev, void *data)
394{
395 struct pcifront_device *pdev = data;
396 int i;
397 struct resource *r;
398
399 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
400 r = &dev->resource[i];
401
402 if (!r->parent && r->start && r->flags) {
403 dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n",
404 pci_name(dev), i);
405 if (pci_claim_resource(dev, i)) {
Konrad Rzeszutek Wilk917e3e62011-07-22 12:18:43 -0400406 dev_err(&pdev->xdev->dev, "Could not claim resource %s/%d! "
407 "Device offline. Try using e820_host=1 in the guest config.\n",
Ryan Wilson956a9202010-08-02 21:31:05 -0400408 pci_name(dev), i);
409 }
410 }
411 }
412
413 return 0;
414}
415
Bill Pemberton15856ad2012-11-21 15:35:00 -0500416static int pcifront_scan_bus(struct pcifront_device *pdev,
Ryan Wilson956a9202010-08-02 21:31:05 -0400417 unsigned int domain, unsigned int bus,
418 struct pci_bus *b)
419{
420 struct pci_dev *d;
421 unsigned int devfn;
422
423 /* Scan the bus for functions and add.
424 * We omit handling of PCI bridge attachment because pciback prevents
425 * bridges from being exported.
426 */
427 for (devfn = 0; devfn < 0x100; devfn++) {
428 d = pci_get_slot(b, devfn);
429 if (d) {
430 /* Device is already known. */
431 pci_dev_put(d);
432 continue;
433 }
434
435 d = pci_scan_single_device(b, devfn);
436 if (d)
437 dev_info(&pdev->xdev->dev, "New device on "
Konrad Rzeszutek Wilke4de8662012-01-25 16:00:00 -0500438 "%04x:%02x:%02x.%d found.\n", domain, bus,
Ryan Wilson956a9202010-08-02 21:31:05 -0400439 PCI_SLOT(devfn), PCI_FUNC(devfn));
440 }
441
442 return 0;
443}
444
Bill Pemberton15856ad2012-11-21 15:35:00 -0500445static int pcifront_scan_root(struct pcifront_device *pdev,
Ryan Wilson956a9202010-08-02 21:31:05 -0400446 unsigned int domain, unsigned int bus)
447{
448 struct pci_bus *b;
449 struct pcifront_sd *sd = NULL;
450 struct pci_bus_entry *bus_entry = NULL;
451 int err = 0;
452
453#ifndef CONFIG_PCI_DOMAINS
454 if (domain != 0) {
455 dev_err(&pdev->xdev->dev,
456 "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
457 dev_err(&pdev->xdev->dev,
458 "Please compile with CONFIG_PCI_DOMAINS\n");
459 err = -EINVAL;
460 goto err_out;
461 }
462#endif
463
464 dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n",
465 domain, bus);
466
467 bus_entry = kmalloc(sizeof(*bus_entry), GFP_KERNEL);
468 sd = kmalloc(sizeof(*sd), GFP_KERNEL);
469 if (!bus_entry || !sd) {
470 err = -ENOMEM;
471 goto err_out;
472 }
473 pcifront_init_sd(sd, domain, bus, pdev);
474
Rafael J. Wysockia83919e2014-01-10 15:29:19 +0100475 pci_lock_rescan_remove();
476
Ryan Wilson956a9202010-08-02 21:31:05 -0400477 b = pci_scan_bus_parented(&pdev->xdev->dev, bus,
478 &pcifront_bus_ops, sd);
479 if (!b) {
480 dev_err(&pdev->xdev->dev,
481 "Error creating PCI Frontend Bus!\n");
482 err = -ENOMEM;
Rafael J. Wysockia83919e2014-01-10 15:29:19 +0100483 pci_unlock_rescan_remove();
Ryan Wilson956a9202010-08-02 21:31:05 -0400484 goto err_out;
485 }
486
487 bus_entry->bus = b;
488
489 list_add(&bus_entry->list, &pdev->root_buses);
490
491 /* pci_scan_bus_parented skips devices which do not have a have
492 * devfn==0. The pcifront_scan_bus enumerates all devfn. */
493 err = pcifront_scan_bus(pdev, domain, bus, b);
494
495 /* Claim resources before going "live" with our devices */
496 pci_walk_bus(b, pcifront_claim_resource, pdev);
497
498 /* Create SysFS and notify udev of the devices. Aka: "going live" */
499 pci_bus_add_devices(b);
500
Rafael J. Wysockia83919e2014-01-10 15:29:19 +0100501 pci_unlock_rescan_remove();
Ryan Wilson956a9202010-08-02 21:31:05 -0400502 return err;
503
504err_out:
505 kfree(bus_entry);
506 kfree(sd);
507
508 return err;
509}
510
Bill Pemberton15856ad2012-11-21 15:35:00 -0500511static int pcifront_rescan_root(struct pcifront_device *pdev,
Ryan Wilson956a9202010-08-02 21:31:05 -0400512 unsigned int domain, unsigned int bus)
513{
514 int err;
515 struct pci_bus *b;
516
517#ifndef CONFIG_PCI_DOMAINS
518 if (domain != 0) {
519 dev_err(&pdev->xdev->dev,
520 "PCI Root in non-zero PCI Domain! domain=%d\n", domain);
521 dev_err(&pdev->xdev->dev,
522 "Please compile with CONFIG_PCI_DOMAINS\n");
523 return -EINVAL;
524 }
525#endif
526
527 dev_info(&pdev->xdev->dev, "Rescanning PCI Frontend Bus %04x:%02x\n",
528 domain, bus);
529
530 b = pci_find_bus(domain, bus);
531 if (!b)
532 /* If the bus is unknown, create it. */
533 return pcifront_scan_root(pdev, domain, bus);
534
535 err = pcifront_scan_bus(pdev, domain, bus, b);
536
537 /* Claim resources before going "live" with our devices */
538 pci_walk_bus(b, pcifront_claim_resource, pdev);
539
540 /* Create SysFS and notify udev of the devices. Aka: "going live" */
541 pci_bus_add_devices(b);
542
543 return err;
544}
545
546static void free_root_bus_devs(struct pci_bus *bus)
547{
548 struct pci_dev *dev;
549
550 while (!list_empty(&bus->devices)) {
551 dev = container_of(bus->devices.next, struct pci_dev,
552 bus_list);
553 dev_dbg(&dev->dev, "removing device\n");
Yinghai Lu210647a2012-02-25 13:54:20 -0800554 pci_stop_and_remove_bus_device(dev);
Ryan Wilson956a9202010-08-02 21:31:05 -0400555 }
556}
557
558static void pcifront_free_roots(struct pcifront_device *pdev)
559{
560 struct pci_bus_entry *bus_entry, *t;
561
562 dev_dbg(&pdev->xdev->dev, "cleaning up root buses\n");
563
Rafael J. Wysockia83919e2014-01-10 15:29:19 +0100564 pci_lock_rescan_remove();
Ryan Wilson956a9202010-08-02 21:31:05 -0400565 list_for_each_entry_safe(bus_entry, t, &pdev->root_buses, list) {
566 list_del(&bus_entry->list);
567
568 free_root_bus_devs(bus_entry->bus);
569
570 kfree(bus_entry->bus->sysdata);
571
572 device_unregister(bus_entry->bus->bridge);
573 pci_remove_bus(bus_entry->bus);
574
575 kfree(bus_entry);
576 }
Rafael J. Wysockia83919e2014-01-10 15:29:19 +0100577 pci_unlock_rescan_remove();
Ryan Wilson956a9202010-08-02 21:31:05 -0400578}
579
580static pci_ers_result_t pcifront_common_process(int cmd,
581 struct pcifront_device *pdev,
582 pci_channel_state_t state)
583{
584 pci_ers_result_t result;
585 struct pci_driver *pdrv;
586 int bus = pdev->sh_info->aer_op.bus;
587 int devfn = pdev->sh_info->aer_op.devfn;
588 struct pci_dev *pcidev;
589 int flag = 0;
590
591 dev_dbg(&pdev->xdev->dev,
592 "pcifront AER process: cmd %x (bus:%x, devfn%x)",
593 cmd, bus, devfn);
594 result = PCI_ERS_RESULT_NONE;
595
596 pcidev = pci_get_bus_and_slot(bus, devfn);
597 if (!pcidev || !pcidev->driver) {
Jiri Slaby2a63dd72010-11-04 15:31:30 +0100598 dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
Markus Elfringff0387c2014-11-10 21:02:17 -0700599 pci_dev_put(pcidev);
Ryan Wilson956a9202010-08-02 21:31:05 -0400600 return result;
601 }
602 pdrv = pcidev->driver;
603
Alan Stern07d25142012-01-27 10:24:40 -0500604 if (pdrv) {
Ryan Wilson956a9202010-08-02 21:31:05 -0400605 if (pdrv->err_handler && pdrv->err_handler->error_detected) {
606 dev_dbg(&pcidev->dev,
607 "trying to call AER service\n");
608 if (pcidev) {
609 flag = 1;
610 switch (cmd) {
611 case XEN_PCI_OP_aer_detected:
612 result = pdrv->err_handler->
613 error_detected(pcidev, state);
614 break;
615 case XEN_PCI_OP_aer_mmio:
616 result = pdrv->err_handler->
617 mmio_enabled(pcidev);
618 break;
619 case XEN_PCI_OP_aer_slotreset:
620 result = pdrv->err_handler->
621 slot_reset(pcidev);
622 break;
623 case XEN_PCI_OP_aer_resume:
624 pdrv->err_handler->resume(pcidev);
625 break;
626 default:
627 dev_err(&pdev->xdev->dev,
628 "bad request in aer recovery "
629 "operation!\n");
630
631 }
632 }
633 }
Ryan Wilson956a9202010-08-02 21:31:05 -0400634 }
635 if (!flag)
636 result = PCI_ERS_RESULT_NONE;
637
638 return result;
639}
640
641
642static void pcifront_do_aer(struct work_struct *data)
643{
644 struct pcifront_device *pdev =
645 container_of(data, struct pcifront_device, op_work);
646 int cmd = pdev->sh_info->aer_op.cmd;
647 pci_channel_state_t state =
648 (pci_channel_state_t)pdev->sh_info->aer_op.err;
649
650 /*If a pci_conf op is in progress,
651 we have to wait until it is done before service aer op*/
652 dev_dbg(&pdev->xdev->dev,
653 "pcifront service aer bus %x devfn %x\n",
654 pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn);
655
656 pdev->sh_info->aer_op.err = pcifront_common_process(cmd, pdev, state);
657
658 /* Post the operation to the guest. */
659 wmb();
660 clear_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags);
661 notify_remote_via_evtchn(pdev->evtchn);
662
663 /*in case of we lost an aer request in four lines time_window*/
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100664 smp_mb__before_atomic();
Ryan Wilson956a9202010-08-02 21:31:05 -0400665 clear_bit(_PDEVB_op_active, &pdev->flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100666 smp_mb__after_atomic();
Ryan Wilson956a9202010-08-02 21:31:05 -0400667
668 schedule_pcifront_aer_op(pdev);
669
670}
671
672static irqreturn_t pcifront_handler_aer(int irq, void *dev)
673{
674 struct pcifront_device *pdev = dev;
675 schedule_pcifront_aer_op(pdev);
676 return IRQ_HANDLED;
677}
Konrad Rzeszutek Wilk3d925322012-07-31 06:26:59 -0400678static int pcifront_connect_and_init_dma(struct pcifront_device *pdev)
Ryan Wilson956a9202010-08-02 21:31:05 -0400679{
680 int err = 0;
681
682 spin_lock(&pcifront_dev_lock);
683
684 if (!pcifront_dev) {
685 dev_info(&pdev->xdev->dev, "Installing PCI frontend\n");
686 pcifront_dev = pdev;
Konrad Rzeszutek Wilk098b1ae2013-06-10 16:48:09 -0400687 } else
Ryan Wilson956a9202010-08-02 21:31:05 -0400688 err = -EEXIST;
Konrad Rzeszutek Wilk098b1ae2013-06-10 16:48:09 -0400689
Ryan Wilson956a9202010-08-02 21:31:05 -0400690 spin_unlock(&pcifront_dev_lock);
691
Konrad Rzeszutek Wilk3d925322012-07-31 06:26:59 -0400692 if (!err && !swiotlb_nr_tbl()) {
693 err = pci_xen_swiotlb_init_late();
694 if (err)
695 dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n");
696 }
Ryan Wilson956a9202010-08-02 21:31:05 -0400697 return err;
698}
699
700static void pcifront_disconnect(struct pcifront_device *pdev)
701{
702 spin_lock(&pcifront_dev_lock);
703
704 if (pdev == pcifront_dev) {
705 dev_info(&pdev->xdev->dev,
706 "Disconnecting PCI Frontend Buses\n");
707 pcifront_dev = NULL;
708 }
709
710 spin_unlock(&pcifront_dev_lock);
711}
712static struct pcifront_device *alloc_pdev(struct xenbus_device *xdev)
713{
714 struct pcifront_device *pdev;
715
716 pdev = kzalloc(sizeof(struct pcifront_device), GFP_KERNEL);
717 if (pdev == NULL)
718 goto out;
719
720 pdev->sh_info =
721 (struct xen_pci_sharedinfo *)__get_free_page(GFP_KERNEL);
722 if (pdev->sh_info == NULL) {
723 kfree(pdev);
724 pdev = NULL;
725 goto out;
726 }
727 pdev->sh_info->flags = 0;
728
729 /*Flag for registering PV AER handler*/
730 set_bit(_XEN_PCIB_AERHANDLER, (void *)&pdev->sh_info->flags);
731
732 dev_set_drvdata(&xdev->dev, pdev);
733 pdev->xdev = xdev;
734
735 INIT_LIST_HEAD(&pdev->root_buses);
736
737 spin_lock_init(&pdev->sh_info_lock);
738
739 pdev->evtchn = INVALID_EVTCHN;
740 pdev->gnt_ref = INVALID_GRANT_REF;
741 pdev->irq = -1;
742
743 INIT_WORK(&pdev->op_work, pcifront_do_aer);
744
745 dev_dbg(&xdev->dev, "Allocated pdev @ 0x%p pdev->sh_info @ 0x%p\n",
746 pdev, pdev->sh_info);
747out:
748 return pdev;
749}
750
751static void free_pdev(struct pcifront_device *pdev)
752{
753 dev_dbg(&pdev->xdev->dev, "freeing pdev @ 0x%p\n", pdev);
754
755 pcifront_free_roots(pdev);
756
Tejun Heodb2e2e62011-01-24 15:43:03 +0100757 cancel_work_sync(&pdev->op_work);
Ryan Wilson956a9202010-08-02 21:31:05 -0400758
759 if (pdev->irq >= 0)
760 unbind_from_irqhandler(pdev->irq, pdev);
761
762 if (pdev->evtchn != INVALID_EVTCHN)
763 xenbus_free_evtchn(pdev->xdev, pdev->evtchn);
764
765 if (pdev->gnt_ref != INVALID_GRANT_REF)
766 gnttab_end_foreign_access(pdev->gnt_ref, 0 /* r/w page */,
767 (unsigned long)pdev->sh_info);
768 else
769 free_page((unsigned long)pdev->sh_info);
770
771 dev_set_drvdata(&pdev->xdev->dev, NULL);
772
773 kfree(pdev);
774}
775
776static int pcifront_publish_info(struct pcifront_device *pdev)
777{
778 int err = 0;
779 struct xenbus_transaction trans;
Wei Liuccc9d902015-04-03 14:44:59 +0800780 grant_ref_t gref;
Ryan Wilson956a9202010-08-02 21:31:05 -0400781
Wei Liuccc9d902015-04-03 14:44:59 +0800782 err = xenbus_grant_ring(pdev->xdev, pdev->sh_info, 1, &gref);
Ryan Wilson956a9202010-08-02 21:31:05 -0400783 if (err < 0)
784 goto out;
785
Wei Liuccc9d902015-04-03 14:44:59 +0800786 pdev->gnt_ref = gref;
Ryan Wilson956a9202010-08-02 21:31:05 -0400787
788 err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);
789 if (err)
790 goto out;
791
792 err = bind_evtchn_to_irqhandler(pdev->evtchn, pcifront_handler_aer,
793 0, "pcifront", pdev);
794
795 if (err < 0)
796 return err;
797
798 pdev->irq = err;
799
800do_publish:
801 err = xenbus_transaction_start(&trans);
802 if (err) {
803 xenbus_dev_fatal(pdev->xdev, err,
804 "Error writing configuration for backend "
805 "(start transaction)");
806 goto out;
807 }
808
809 err = xenbus_printf(trans, pdev->xdev->nodename,
810 "pci-op-ref", "%u", pdev->gnt_ref);
811 if (!err)
812 err = xenbus_printf(trans, pdev->xdev->nodename,
813 "event-channel", "%u", pdev->evtchn);
814 if (!err)
815 err = xenbus_printf(trans, pdev->xdev->nodename,
816 "magic", XEN_PCI_MAGIC);
817
818 if (err) {
819 xenbus_transaction_end(trans, 1);
820 xenbus_dev_fatal(pdev->xdev, err,
821 "Error writing configuration for backend");
822 goto out;
823 } else {
824 err = xenbus_transaction_end(trans, 0);
825 if (err == -EAGAIN)
826 goto do_publish;
827 else if (err) {
828 xenbus_dev_fatal(pdev->xdev, err,
829 "Error completing transaction "
830 "for backend");
831 goto out;
832 }
833 }
834
835 xenbus_switch_state(pdev->xdev, XenbusStateInitialised);
836
837 dev_dbg(&pdev->xdev->dev, "publishing successful!\n");
838
839out:
840 return err;
841}
842
Bill Pemberton15856ad2012-11-21 15:35:00 -0500843static int pcifront_try_connect(struct pcifront_device *pdev)
Ryan Wilson956a9202010-08-02 21:31:05 -0400844{
845 int err = -EFAULT;
846 int i, num_roots, len;
847 char str[64];
848 unsigned int domain, bus;
849
850
851 /* Only connect once */
852 if (xenbus_read_driver_state(pdev->xdev->nodename) !=
853 XenbusStateInitialised)
854 goto out;
855
Konrad Rzeszutek Wilk3d925322012-07-31 06:26:59 -0400856 err = pcifront_connect_and_init_dma(pdev);
Konrad Rzeszutek Wilk098b1ae2013-06-10 16:48:09 -0400857 if (err && err != -EEXIST) {
Ryan Wilson956a9202010-08-02 21:31:05 -0400858 xenbus_dev_fatal(pdev->xdev, err,
Konrad Rzeszutek Wilk3d925322012-07-31 06:26:59 -0400859 "Error setting up PCI Frontend");
Ryan Wilson956a9202010-08-02 21:31:05 -0400860 goto out;
861 }
862
863 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
864 "root_num", "%d", &num_roots);
865 if (err == -ENOENT) {
866 xenbus_dev_error(pdev->xdev, err,
867 "No PCI Roots found, trying 0000:00");
868 err = pcifront_scan_root(pdev, 0, 0);
Chen Gang23cf1d02014-10-06 11:04:45 +0800869 if (err) {
870 xenbus_dev_fatal(pdev->xdev, err,
871 "Error scanning PCI root 0000:00");
872 goto out;
873 }
Ryan Wilson956a9202010-08-02 21:31:05 -0400874 num_roots = 0;
875 } else if (err != 1) {
876 if (err == 0)
877 err = -EINVAL;
878 xenbus_dev_fatal(pdev->xdev, err,
879 "Error reading number of PCI roots");
880 goto out;
881 }
882
883 for (i = 0; i < num_roots; i++) {
884 len = snprintf(str, sizeof(str), "root-%d", i);
885 if (unlikely(len >= (sizeof(str) - 1))) {
886 err = -ENOMEM;
887 goto out;
888 }
889
890 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
891 "%x:%x", &domain, &bus);
892 if (err != 2) {
893 if (err >= 0)
894 err = -EINVAL;
895 xenbus_dev_fatal(pdev->xdev, err,
896 "Error reading PCI root %d", i);
897 goto out;
898 }
899
900 err = pcifront_scan_root(pdev, domain, bus);
901 if (err) {
902 xenbus_dev_fatal(pdev->xdev, err,
903 "Error scanning PCI root %04x:%02x",
904 domain, bus);
905 goto out;
906 }
907 }
908
909 err = xenbus_switch_state(pdev->xdev, XenbusStateConnected);
910
911out:
912 return err;
913}
914
915static int pcifront_try_disconnect(struct pcifront_device *pdev)
916{
917 int err = 0;
918 enum xenbus_state prev_state;
919
920
921 prev_state = xenbus_read_driver_state(pdev->xdev->nodename);
922
923 if (prev_state >= XenbusStateClosing)
924 goto out;
925
926 if (prev_state == XenbusStateConnected) {
927 pcifront_free_roots(pdev);
928 pcifront_disconnect(pdev);
929 }
930
931 err = xenbus_switch_state(pdev->xdev, XenbusStateClosed);
932
933out:
934
935 return err;
936}
937
Bill Pemberton15856ad2012-11-21 15:35:00 -0500938static int pcifront_attach_devices(struct pcifront_device *pdev)
Ryan Wilson956a9202010-08-02 21:31:05 -0400939{
940 int err = -EFAULT;
941 int i, num_roots, len;
942 unsigned int domain, bus;
943 char str[64];
944
945 if (xenbus_read_driver_state(pdev->xdev->nodename) !=
946 XenbusStateReconfiguring)
947 goto out;
948
949 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend,
950 "root_num", "%d", &num_roots);
951 if (err == -ENOENT) {
952 xenbus_dev_error(pdev->xdev, err,
953 "No PCI Roots found, trying 0000:00");
954 err = pcifront_rescan_root(pdev, 0, 0);
Chen Gang23cf1d02014-10-06 11:04:45 +0800955 if (err) {
956 xenbus_dev_fatal(pdev->xdev, err,
957 "Error scanning PCI root 0000:00");
958 goto out;
959 }
Ryan Wilson956a9202010-08-02 21:31:05 -0400960 num_roots = 0;
961 } else if (err != 1) {
962 if (err == 0)
963 err = -EINVAL;
964 xenbus_dev_fatal(pdev->xdev, err,
965 "Error reading number of PCI roots");
966 goto out;
967 }
968
969 for (i = 0; i < num_roots; i++) {
970 len = snprintf(str, sizeof(str), "root-%d", i);
971 if (unlikely(len >= (sizeof(str) - 1))) {
972 err = -ENOMEM;
973 goto out;
974 }
975
976 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
977 "%x:%x", &domain, &bus);
978 if (err != 2) {
979 if (err >= 0)
980 err = -EINVAL;
981 xenbus_dev_fatal(pdev->xdev, err,
982 "Error reading PCI root %d", i);
983 goto out;
984 }
985
986 err = pcifront_rescan_root(pdev, domain, bus);
987 if (err) {
988 xenbus_dev_fatal(pdev->xdev, err,
989 "Error scanning PCI root %04x:%02x",
990 domain, bus);
991 goto out;
992 }
993 }
994
995 xenbus_switch_state(pdev->xdev, XenbusStateConnected);
996
997out:
998 return err;
999}
1000
1001static int pcifront_detach_devices(struct pcifront_device *pdev)
1002{
1003 int err = 0;
1004 int i, num_devs;
1005 unsigned int domain, bus, slot, func;
Ryan Wilson956a9202010-08-02 21:31:05 -04001006 struct pci_dev *pci_dev;
1007 char str[64];
1008
1009 if (xenbus_read_driver_state(pdev->xdev->nodename) !=
1010 XenbusStateConnected)
1011 goto out;
1012
1013 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, "num_devs", "%d",
1014 &num_devs);
1015 if (err != 1) {
1016 if (err >= 0)
1017 err = -EINVAL;
1018 xenbus_dev_fatal(pdev->xdev, err,
1019 "Error reading number of PCI devices");
1020 goto out;
1021 }
1022
1023 /* Find devices being detached and remove them. */
1024 for (i = 0; i < num_devs; i++) {
1025 int l, state;
1026 l = snprintf(str, sizeof(str), "state-%d", i);
1027 if (unlikely(l >= (sizeof(str) - 1))) {
1028 err = -ENOMEM;
1029 goto out;
1030 }
1031 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str, "%d",
1032 &state);
1033 if (err != 1)
1034 state = XenbusStateUnknown;
1035
1036 if (state != XenbusStateClosing)
1037 continue;
1038
1039 /* Remove device. */
1040 l = snprintf(str, sizeof(str), "vdev-%d", i);
1041 if (unlikely(l >= (sizeof(str) - 1))) {
1042 err = -ENOMEM;
1043 goto out;
1044 }
1045 err = xenbus_scanf(XBT_NIL, pdev->xdev->otherend, str,
1046 "%x:%x:%x.%x", &domain, &bus, &slot, &func);
1047 if (err != 4) {
1048 if (err >= 0)
1049 err = -EINVAL;
1050 xenbus_dev_fatal(pdev->xdev, err,
1051 "Error reading PCI device %d", i);
1052 goto out;
1053 }
1054
Jiang Liu2ccc2462012-08-28 23:43:58 +08001055 pci_dev = pci_get_domain_bus_and_slot(domain, bus,
1056 PCI_DEVFN(slot, func));
Ryan Wilson956a9202010-08-02 21:31:05 -04001057 if (!pci_dev) {
1058 dev_dbg(&pdev->xdev->dev,
Konrad Rzeszutek Wilke4de8662012-01-25 16:00:00 -05001059 "Cannot get PCI device %04x:%02x:%02x.%d\n",
Ryan Wilson956a9202010-08-02 21:31:05 -04001060 domain, bus, slot, func);
1061 continue;
1062 }
Rafael J. Wysockia83919e2014-01-10 15:29:19 +01001063 pci_lock_rescan_remove();
Yinghai Lu210647a2012-02-25 13:54:20 -08001064 pci_stop_and_remove_bus_device(pci_dev);
Ryan Wilson956a9202010-08-02 21:31:05 -04001065 pci_dev_put(pci_dev);
Rafael J. Wysockia83919e2014-01-10 15:29:19 +01001066 pci_unlock_rescan_remove();
Ryan Wilson956a9202010-08-02 21:31:05 -04001067
1068 dev_dbg(&pdev->xdev->dev,
Konrad Rzeszutek Wilke4de8662012-01-25 16:00:00 -05001069 "PCI device %04x:%02x:%02x.%d removed.\n",
Ryan Wilson956a9202010-08-02 21:31:05 -04001070 domain, bus, slot, func);
1071 }
1072
1073 err = xenbus_switch_state(pdev->xdev, XenbusStateReconfiguring);
1074
1075out:
1076 return err;
1077}
1078
1079static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev,
1080 enum xenbus_state be_state)
1081{
1082 struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
1083
1084 switch (be_state) {
1085 case XenbusStateUnknown:
1086 case XenbusStateInitialising:
1087 case XenbusStateInitWait:
1088 case XenbusStateInitialised:
Ryan Wilson956a9202010-08-02 21:31:05 -04001089 break;
1090
1091 case XenbusStateConnected:
1092 pcifront_try_connect(pdev);
1093 break;
1094
David Vrabeld5af64d2012-10-18 11:03:36 +01001095 case XenbusStateClosed:
1096 if (xdev->state == XenbusStateClosed)
1097 break;
1098 /* Missed the backend's CLOSING state -- fallthrough */
Ryan Wilson956a9202010-08-02 21:31:05 -04001099 case XenbusStateClosing:
1100 dev_warn(&xdev->dev, "backend going away!\n");
1101 pcifront_try_disconnect(pdev);
1102 break;
1103
1104 case XenbusStateReconfiguring:
1105 pcifront_detach_devices(pdev);
1106 break;
1107
1108 case XenbusStateReconfigured:
1109 pcifront_attach_devices(pdev);
1110 break;
1111 }
1112}
1113
1114static int pcifront_xenbus_probe(struct xenbus_device *xdev,
1115 const struct xenbus_device_id *id)
1116{
1117 int err = 0;
1118 struct pcifront_device *pdev = alloc_pdev(xdev);
1119
1120 if (pdev == NULL) {
1121 err = -ENOMEM;
1122 xenbus_dev_fatal(xdev, err,
1123 "Error allocating pcifront_device struct");
1124 goto out;
1125 }
1126
1127 err = pcifront_publish_info(pdev);
1128 if (err)
1129 free_pdev(pdev);
1130
1131out:
1132 return err;
1133}
1134
1135static int pcifront_xenbus_remove(struct xenbus_device *xdev)
1136{
1137 struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
1138 if (pdev)
1139 free_pdev(pdev);
1140
1141 return 0;
1142}
1143
1144static const struct xenbus_device_id xenpci_ids[] = {
1145 {"pci"},
1146 {""},
1147};
1148
David Vrabel95afae42014-09-08 17:30:41 +01001149static struct xenbus_driver xenpci_driver = {
1150 .name = "pcifront",
1151 .ids = xenpci_ids,
Ryan Wilson956a9202010-08-02 21:31:05 -04001152 .probe = pcifront_xenbus_probe,
1153 .remove = pcifront_xenbus_remove,
1154 .otherend_changed = pcifront_backend_changed,
David Vrabel95afae42014-09-08 17:30:41 +01001155};
Ryan Wilson956a9202010-08-02 21:31:05 -04001156
1157static int __init pcifront_init(void)
1158{
1159 if (!xen_pv_domain() || xen_initial_domain())
1160 return -ENODEV;
1161
Konrad Rzeszutek Wilk51c71a32013-11-26 15:05:40 -05001162 if (!xen_has_pv_devices())
1163 return -ENODEV;
1164
Ryan Wilson956a9202010-08-02 21:31:05 -04001165 pci_frontend_registrar(1 /* enable */);
1166
Jan Beulich73db1442011-12-22 09:08:13 +00001167 return xenbus_register_frontend(&xenpci_driver);
Ryan Wilson956a9202010-08-02 21:31:05 -04001168}
1169
1170static void __exit pcifront_cleanup(void)
1171{
Jan Beulich73db1442011-12-22 09:08:13 +00001172 xenbus_unregister_driver(&xenpci_driver);
Ryan Wilson956a9202010-08-02 21:31:05 -04001173 pci_frontend_registrar(0 /* disable */);
1174}
1175module_init(pcifront_init);
1176module_exit(pcifront_cleanup);
1177
1178MODULE_DESCRIPTION("Xen PCI passthrough frontend.");
1179MODULE_LICENSE("GPL");
1180MODULE_ALIAS("xen:pci");