2 * PCI Stub Driver - Grabs devices in backend to be exported later
4 * Ryan Wilson <hap9@epoch.ncsc.mil>
5 * Chris Bookholt <hap10@epoch.ncsc.mil>
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/rwsem.h>
10 #include <linux/list.h>
11 #include <linux/spinlock.h>
12 #include <linux/kref.h>
13 #include <linux/pci.h>
14 #include <linux/wait.h>
15 #include <linux/sched.h>
16 #include <linux/atomic.h>
17 #include <xen/events.h>
18 #include <asm/xen/pci.h>
19 #include <asm/xen/hypervisor.h>
21 #include "conf_space.h"
22 #include "conf_space_quirks.h"
24 static char *pci_devs_to_hide;
25 wait_queue_head_t xen_pcibk_aer_wait_queue;
26 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
27 * We want to avoid in middle of AER ops, xen_pcibk devices is being removed
29 static DECLARE_RWSEM(pcistub_sem);
30 module_param_named(hide, pci_devs_to_hide, charp, 0444);
32 struct pcistub_device_id {
33 struct list_head slot_list;
38 static LIST_HEAD(pcistub_device_ids);
39 static DEFINE_SPINLOCK(device_ids_lock);
41 struct pcistub_device {
43 struct list_head dev_list;
47 struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */
50 /* Access to pcistub_devices & seized_devices lists and the initialize_devices
51 * flag must be locked with pcistub_devices_lock
53 static DEFINE_SPINLOCK(pcistub_devices_lock);
54 static LIST_HEAD(pcistub_devices);
56 /* wait for device_initcall before initializing our devices
57 * (see pcistub_init_devices_late)
59 static int initialize_devices;
60 static LIST_HEAD(seized_devices);
62 static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
64 struct pcistub_device *psdev;
66 dev_dbg(&dev->dev, "pcistub_device_alloc\n");
68 psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC);
72 psdev->dev = pci_dev_get(dev);
78 kref_init(&psdev->kref);
79 spin_lock_init(&psdev->lock);
84 /* Don't call this directly as it's called by pcistub_device_put */
85 static void pcistub_device_release(struct kref *kref)
87 struct pcistub_device *psdev;
89 psdev = container_of(kref, struct pcistub_device, kref);
91 dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
93 xen_unregister_device_domain_owner(psdev->dev);
95 /* Clean-up the device */
96 xen_pcibk_reset_device(psdev->dev);
97 xen_pcibk_config_free_dyn_fields(psdev->dev);
98 xen_pcibk_config_free_dev(psdev->dev);
99 kfree(pci_get_drvdata(psdev->dev));
100 pci_set_drvdata(psdev->dev, NULL);
102 pci_dev_put(psdev->dev);
107 static inline void pcistub_device_get(struct pcistub_device *psdev)
109 kref_get(&psdev->kref);
112 static inline void pcistub_device_put(struct pcistub_device *psdev)
114 kref_put(&psdev->kref, pcistub_device_release);
117 static struct pcistub_device *pcistub_device_find(int domain, int bus,
120 struct pcistub_device *psdev = NULL;
123 spin_lock_irqsave(&pcistub_devices_lock, flags);
125 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
126 if (psdev->dev != NULL
127 && domain == pci_domain_nr(psdev->dev->bus)
128 && bus == psdev->dev->bus->number
129 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
130 pcistub_device_get(psdev);
139 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
143 static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
144 struct pcistub_device *psdev)
146 struct pci_dev *pci_dev = NULL;
149 pcistub_device_get(psdev);
151 spin_lock_irqsave(&psdev->lock, flags);
154 pci_dev = psdev->dev;
156 spin_unlock_irqrestore(&psdev->lock, flags);
159 pcistub_device_put(psdev);
164 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
168 struct pcistub_device *psdev;
169 struct pci_dev *found_dev = NULL;
172 spin_lock_irqsave(&pcistub_devices_lock, flags);
174 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
175 if (psdev->dev != NULL
176 && domain == pci_domain_nr(psdev->dev->bus)
177 && bus == psdev->dev->bus->number
178 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
179 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
184 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
188 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
191 struct pcistub_device *psdev;
192 struct pci_dev *found_dev = NULL;
195 spin_lock_irqsave(&pcistub_devices_lock, flags);
197 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
198 if (psdev->dev == dev) {
199 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
204 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
208 void pcistub_put_pci_dev(struct pci_dev *dev)
210 struct pcistub_device *psdev, *found_psdev = NULL;
213 spin_lock_irqsave(&pcistub_devices_lock, flags);
215 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
216 if (psdev->dev == dev) {
222 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
224 /*hold this lock for avoiding breaking link between
225 * pcistub and xen_pcibk when AER is in processing
227 down_write(&pcistub_sem);
228 /* Cleanup our device
229 * (so it's ready for the next domain)
231 xen_pcibk_reset_device(found_psdev->dev);
232 xen_pcibk_config_free_dyn_fields(found_psdev->dev);
233 xen_pcibk_config_reset_dev(found_psdev->dev);
235 spin_lock_irqsave(&found_psdev->lock, flags);
236 found_psdev->pdev = NULL;
237 spin_unlock_irqrestore(&found_psdev->lock, flags);
239 pcistub_device_put(found_psdev);
240 up_write(&pcistub_sem);
243 static int __devinit pcistub_match_one(struct pci_dev *dev,
244 struct pcistub_device_id *pdev_id)
246 /* Match the specified device by domain, bus, slot, func and also if
247 * any of the device's parent bridges match.
249 for (; dev != NULL; dev = dev->bus->self) {
250 if (pci_domain_nr(dev->bus) == pdev_id->domain
251 && dev->bus->number == pdev_id->bus
252 && dev->devfn == pdev_id->devfn)
255 /* Sometimes topmost bridge links to itself. */
256 if (dev == dev->bus->self)
263 static int __devinit pcistub_match(struct pci_dev *dev)
265 struct pcistub_device_id *pdev_id;
269 spin_lock_irqsave(&device_ids_lock, flags);
270 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
271 if (pcistub_match_one(dev, pdev_id)) {
276 spin_unlock_irqrestore(&device_ids_lock, flags);
281 static int __devinit pcistub_init_device(struct pci_dev *dev)
283 struct xen_pcibk_dev_data *dev_data;
286 dev_dbg(&dev->dev, "initializing...\n");
288 /* The PCI backend is not intended to be a module (or to work with
289 * removable PCI devices (yet). If it were, xen_pcibk_config_free()
290 * would need to be called somewhere to free the memory allocated
291 * here and then to call kfree(pci_get_drvdata(psdev->dev)).
293 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
294 + strlen(pci_name(dev)) + 1, GFP_ATOMIC);
299 pci_set_drvdata(dev, dev_data);
302 * Setup name for fake IRQ handler. It will only be enabled
303 * once the device is turned on by the guest.
305 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
307 dev_dbg(&dev->dev, "initializing config\n");
309 init_waitqueue_head(&xen_pcibk_aer_wait_queue);
310 err = xen_pcibk_config_init_dev(dev);
314 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we
315 * must do this here because pcibios_enable_device may specify
316 * the pci device's true irq (and possibly its other resources)
317 * if they differ from what's in the configuration space.
318 * This makes the assumption that the device's resources won't
319 * change after this point (otherwise this code may break!)
321 dev_dbg(&dev->dev, "enabling device\n");
322 err = pci_enable_device(dev);
326 /* Now disable the device (this also ensures some private device
327 * data is setup before we export)
329 dev_dbg(&dev->dev, "reset device\n");
330 xen_pcibk_reset_device(dev);
335 xen_pcibk_config_free_dev(dev);
338 pci_set_drvdata(dev, NULL);
344 * Because some initialization still happens on
345 * devices during fs_initcall, we need to defer
346 * full initialization of our devices until
349 static int __init pcistub_init_devices_late(void)
351 struct pcistub_device *psdev;
355 pr_debug(DRV_NAME ": pcistub_init_devices_late\n");
357 spin_lock_irqsave(&pcistub_devices_lock, flags);
359 while (!list_empty(&seized_devices)) {
360 psdev = container_of(seized_devices.next,
361 struct pcistub_device, dev_list);
362 list_del(&psdev->dev_list);
364 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
366 err = pcistub_init_device(psdev->dev);
368 dev_err(&psdev->dev->dev,
369 "error %d initializing device\n", err);
374 spin_lock_irqsave(&pcistub_devices_lock, flags);
377 list_add_tail(&psdev->dev_list, &pcistub_devices);
380 initialize_devices = 1;
382 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
387 static int __devinit pcistub_seize(struct pci_dev *dev)
389 struct pcistub_device *psdev;
393 psdev = pcistub_device_alloc(dev);
397 spin_lock_irqsave(&pcistub_devices_lock, flags);
399 if (initialize_devices) {
400 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
402 /* don't want irqs disabled when calling pcistub_init_device */
403 err = pcistub_init_device(psdev->dev);
405 spin_lock_irqsave(&pcistub_devices_lock, flags);
408 list_add(&psdev->dev_list, &pcistub_devices);
410 dev_dbg(&dev->dev, "deferring initialization\n");
411 list_add(&psdev->dev_list, &seized_devices);
414 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
417 pcistub_device_put(psdev);
422 static int __devinit pcistub_probe(struct pci_dev *dev,
423 const struct pci_device_id *id)
427 dev_dbg(&dev->dev, "probing...\n");
429 if (pcistub_match(dev)) {
431 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
432 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
433 dev_err(&dev->dev, "can't export pci devices that "
434 "don't have a normal (0) or bridge (1) "
440 dev_info(&dev->dev, "seizing device\n");
441 err = pcistub_seize(dev);
443 /* Didn't find the device */
450 static void pcistub_remove(struct pci_dev *dev)
452 struct pcistub_device *psdev, *found_psdev = NULL;
455 dev_dbg(&dev->dev, "removing\n");
457 spin_lock_irqsave(&pcistub_devices_lock, flags);
459 xen_pcibk_config_quirk_release(dev);
461 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
462 if (psdev->dev == dev) {
468 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
471 dev_dbg(&dev->dev, "found device to remove - in use? %p\n",
474 if (found_psdev->pdev) {
475 printk(KERN_WARNING DRV_NAME ": ****** removing device "
476 "%s while still in-use! ******\n",
477 pci_name(found_psdev->dev));
478 printk(KERN_WARNING DRV_NAME ": ****** driver domain may"
479 " still access this device's i/o resources!\n");
480 printk(KERN_WARNING DRV_NAME ": ****** shutdown driver "
481 "domain before binding device\n");
482 printk(KERN_WARNING DRV_NAME ": ****** to other drivers "
485 xen_pcibk_release_pci_dev(found_psdev->pdev,
489 spin_lock_irqsave(&pcistub_devices_lock, flags);
490 list_del(&found_psdev->dev_list);
491 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
493 /* the final put for releasing from the list */
494 pcistub_device_put(found_psdev);
498 static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = {
500 .vendor = PCI_ANY_ID,
501 .device = PCI_ANY_ID,
502 .subvendor = PCI_ANY_ID,
503 .subdevice = PCI_ANY_ID,
508 #define PCI_NODENAME_MAX 40
509 static void kill_domain_by_device(struct pcistub_device *psdev)
511 struct xenbus_transaction xbt;
513 char nodename[PCI_NODENAME_MAX];
516 dev_err(&psdev->dev->dev,
517 "device is NULL when do AER recovery/kill_domain\n");
521 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
522 psdev->pdev->xdev->otherend_id);
525 err = xenbus_transaction_start(&xbt);
527 dev_err(&psdev->dev->dev,
528 "error %d when start xenbus transaction\n", err);
531 /*PV AER handlers will set this flag*/
532 xenbus_printf(xbt, nodename, "aerState" , "aerfail");
533 err = xenbus_transaction_end(xbt, 0);
537 dev_err(&psdev->dev->dev,
538 "error %d when end xenbus transaction\n", err);
543 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
544 * backend need to have cooperation. In xen_pcibk, those steps will do similar
545 * jobs: send service request and waiting for front_end response.
547 static pci_ers_result_t common_process(struct pcistub_device *psdev,
548 pci_channel_state_t state, int aer_cmd,
549 pci_ers_result_t result)
551 pci_ers_result_t res = result;
552 struct xen_pcie_aer_op *aer_op;
555 /*with PV AER drivers*/
556 aer_op = &(psdev->pdev->sh_info->aer_op);
557 aer_op->cmd = aer_cmd ;
558 /*useful for error_detected callback*/
561 ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
562 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
564 dev_err(&psdev->dev->dev,
565 DRV_NAME ": failed to get pcifront device\n");
566 return PCI_ERS_RESULT_NONE;
570 dev_dbg(&psdev->dev->dev,
571 DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n",
572 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
573 /*local flag to mark there's aer request, xen_pcibk callback will use
574 * this flag to judge whether we need to check pci-front give aer
577 set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
579 /*It is possible that a pcifront conf_read_write ops request invokes
580 * the callback which cause the spurious execution of wake_up.
581 * Yet it is harmless and better than a spinlock here
583 set_bit(_XEN_PCIB_active,
584 (unsigned long *)&psdev->pdev->sh_info->flags);
586 notify_remote_via_irq(psdev->pdev->evtchn_irq);
588 ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
589 !(test_bit(_XEN_PCIB_active, (unsigned long *)
590 &psdev->pdev->sh_info->flags)), 300*HZ);
593 if (test_bit(_XEN_PCIB_active,
594 (unsigned long *)&psdev->pdev->sh_info->flags)) {
595 dev_err(&psdev->dev->dev,
596 "pcifront aer process not responding!\n");
597 clear_bit(_XEN_PCIB_active,
598 (unsigned long *)&psdev->pdev->sh_info->flags);
599 aer_op->err = PCI_ERS_RESULT_NONE;
603 clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
605 if (test_bit(_XEN_PCIF_active,
606 (unsigned long *)&psdev->pdev->sh_info->flags)) {
607 dev_dbg(&psdev->dev->dev,
608 "schedule pci_conf service in " DRV_NAME "\n");
609 xen_pcibk_test_and_schedule_op(psdev->pdev);
612 res = (pci_ers_result_t)aer_op->err;
617 * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case
618 * of the device driver could provide this service, and then wait for pcifront
620 * @dev: pointer to PCI devices
621 * return value is used by aer_core do_recovery policy
623 static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
625 struct pcistub_device *psdev;
626 pci_ers_result_t result;
628 result = PCI_ERS_RESULT_RECOVERED;
629 dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
630 dev->bus->number, dev->devfn);
632 down_write(&pcistub_sem);
633 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
635 PCI_SLOT(dev->devfn),
636 PCI_FUNC(dev->devfn));
638 if (!psdev || !psdev->pdev) {
640 DRV_NAME " device is not found/assigned\n");
644 if (!psdev->pdev->sh_info) {
645 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
646 " by HVM, kill it\n");
647 kill_domain_by_device(psdev);
651 if (!test_bit(_XEN_PCIB_AERHANDLER,
652 (unsigned long *)&psdev->pdev->sh_info->flags)) {
654 "guest with no AER driver should have been killed\n");
657 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
659 if (result == PCI_ERS_RESULT_NONE ||
660 result == PCI_ERS_RESULT_DISCONNECT) {
662 "No AER slot_reset service or disconnected!\n");
663 kill_domain_by_device(psdev);
666 pcistub_device_put(psdev);
668 up_write(&pcistub_sem);
674 /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront
675 * in case of the device driver could provide this service, and then wait
677 * @dev: pointer to PCI devices
678 * return value is used by aer_core do_recovery policy
681 static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
683 struct pcistub_device *psdev;
684 pci_ers_result_t result;
686 result = PCI_ERS_RESULT_RECOVERED;
687 dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
688 dev->bus->number, dev->devfn);
690 down_write(&pcistub_sem);
691 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
693 PCI_SLOT(dev->devfn),
694 PCI_FUNC(dev->devfn));
696 if (!psdev || !psdev->pdev) {
698 DRV_NAME " device is not found/assigned\n");
702 if (!psdev->pdev->sh_info) {
703 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
704 " by HVM, kill it\n");
705 kill_domain_by_device(psdev);
709 if (!test_bit(_XEN_PCIB_AERHANDLER,
710 (unsigned long *)&psdev->pdev->sh_info->flags)) {
712 "guest with no AER driver should have been killed\n");
715 result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
717 if (result == PCI_ERS_RESULT_NONE ||
718 result == PCI_ERS_RESULT_DISCONNECT) {
720 "No AER mmio_enabled service or disconnected!\n");
721 kill_domain_by_device(psdev);
724 pcistub_device_put(psdev);
726 up_write(&pcistub_sem);
730 /*xen_pcibk_error_detected: it will send the error_detected request to pcifront
731 * in case of the device driver could provide this service, and then wait
733 * @dev: pointer to PCI devices
734 * @error: the current PCI connection state
735 * return value is used by aer_core do_recovery policy
738 static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev,
739 pci_channel_state_t error)
741 struct pcistub_device *psdev;
742 pci_ers_result_t result;
744 result = PCI_ERS_RESULT_CAN_RECOVER;
745 dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n",
746 dev->bus->number, dev->devfn);
748 down_write(&pcistub_sem);
749 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
751 PCI_SLOT(dev->devfn),
752 PCI_FUNC(dev->devfn));
754 if (!psdev || !psdev->pdev) {
756 DRV_NAME " device is not found/assigned\n");
760 if (!psdev->pdev->sh_info) {
761 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
762 " by HVM, kill it\n");
763 kill_domain_by_device(psdev);
767 /*Guest owns the device yet no aer handler regiested, kill guest*/
768 if (!test_bit(_XEN_PCIB_AERHANDLER,
769 (unsigned long *)&psdev->pdev->sh_info->flags)) {
770 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
771 kill_domain_by_device(psdev);
774 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
776 if (result == PCI_ERS_RESULT_NONE ||
777 result == PCI_ERS_RESULT_DISCONNECT) {
779 "No AER error_detected service or disconnected!\n");
780 kill_domain_by_device(psdev);
783 pcistub_device_put(psdev);
785 up_write(&pcistub_sem);
789 /*xen_pcibk_error_resume: it will send the error_resume request to pcifront
790 * in case of the device driver could provide this service, and then wait
792 * @dev: pointer to PCI devices
795 static void xen_pcibk_error_resume(struct pci_dev *dev)
797 struct pcistub_device *psdev;
799 dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
800 dev->bus->number, dev->devfn);
802 down_write(&pcistub_sem);
803 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
805 PCI_SLOT(dev->devfn),
806 PCI_FUNC(dev->devfn));
808 if (!psdev || !psdev->pdev) {
810 DRV_NAME " device is not found/assigned\n");
814 if (!psdev->pdev->sh_info) {
815 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
816 " by HVM, kill it\n");
817 kill_domain_by_device(psdev);
821 if (!test_bit(_XEN_PCIB_AERHANDLER,
822 (unsigned long *)&psdev->pdev->sh_info->flags)) {
824 "guest with no AER driver should have been killed\n");
825 kill_domain_by_device(psdev);
828 common_process(psdev, 1, XEN_PCI_OP_aer_resume,
829 PCI_ERS_RESULT_RECOVERED);
831 pcistub_device_put(psdev);
833 up_write(&pcistub_sem);
837 /*add xen_pcibk AER handling*/
838 static struct pci_error_handlers xen_pcibk_error_handler = {
839 .error_detected = xen_pcibk_error_detected,
840 .mmio_enabled = xen_pcibk_mmio_enabled,
841 .slot_reset = xen_pcibk_slot_reset,
842 .resume = xen_pcibk_error_resume,
846 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
847 * for a normal device. I don't want it to be loaded automatically.
850 static struct pci_driver xen_pcibk_pci_driver = {
851 /* The name should be xen_pciback, but until the tools are updated
852 * we will keep it as pciback. */
854 .id_table = pcistub_ids,
855 .probe = pcistub_probe,
856 .remove = pcistub_remove,
857 .err_handler = &xen_pcibk_error_handler,
860 static inline int str_to_slot(const char *buf, int *domain, int *bus,
861 int *slot, int *func)
865 err = sscanf(buf, " %x:%x:%x.%x", domain, bus, slot, func);
871 /* try again without domain */
873 err = sscanf(buf, " %x:%x.%x", bus, slot, func);
880 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
881 *slot, int *func, int *reg, int *size, int *mask)
886 sscanf(buf, " %04x:%02x:%02x.%1x-%08x:%1x:%08x", domain, bus, slot,
887 func, reg, size, mask);
893 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
895 struct pcistub_device_id *pci_dev_id;
898 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
902 pci_dev_id->domain = domain;
903 pci_dev_id->bus = bus;
904 pci_dev_id->devfn = PCI_DEVFN(slot, func);
906 pr_debug(DRV_NAME ": wants to seize %04x:%02x:%02x.%01x\n",
907 domain, bus, slot, func);
909 spin_lock_irqsave(&device_ids_lock, flags);
910 list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids);
911 spin_unlock_irqrestore(&device_ids_lock, flags);
916 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
918 struct pcistub_device_id *pci_dev_id, *t;
919 int devfn = PCI_DEVFN(slot, func);
923 spin_lock_irqsave(&device_ids_lock, flags);
924 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
926 if (pci_dev_id->domain == domain
927 && pci_dev_id->bus == bus && pci_dev_id->devfn == devfn) {
928 /* Don't break; here because it's possible the same
929 * slot could be in the list more than once
931 list_del(&pci_dev_id->slot_list);
936 pr_debug(DRV_NAME ": removed %04x:%02x:%02x.%01x from "
937 "seize list\n", domain, bus, slot, func);
940 spin_unlock_irqrestore(&device_ids_lock, flags);
945 static int pcistub_reg_add(int domain, int bus, int slot, int func, int reg,
949 struct pcistub_device *psdev;
951 struct config_field *field;
953 psdev = pcistub_device_find(domain, bus, slot, func);
954 if (!psdev || !psdev->dev) {
960 field = kzalloc(sizeof(*field), GFP_ATOMIC);
971 field->release = NULL;
972 field->clean = xen_pcibk_config_field_free;
974 err = xen_pcibk_config_quirks_add_field(dev, field);
981 static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
984 int domain, bus, slot, func;
987 err = str_to_slot(buf, &domain, &bus, &slot, &func);
991 err = pcistub_device_id_add(domain, bus, slot, func);
998 static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
1000 static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
1003 int domain, bus, slot, func;
1006 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1010 err = pcistub_device_id_remove(domain, bus, slot, func);
1017 static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
1019 static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
1021 struct pcistub_device_id *pci_dev_id;
1023 unsigned long flags;
1025 spin_lock_irqsave(&device_ids_lock, flags);
1026 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1027 if (count >= PAGE_SIZE)
1030 count += scnprintf(buf + count, PAGE_SIZE - count,
1031 "%04x:%02x:%02x.%01x\n",
1032 pci_dev_id->domain, pci_dev_id->bus,
1033 PCI_SLOT(pci_dev_id->devfn),
1034 PCI_FUNC(pci_dev_id->devfn));
1036 spin_unlock_irqrestore(&device_ids_lock, flags);
1040 static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
1042 static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
1044 struct pcistub_device *psdev;
1045 struct xen_pcibk_dev_data *dev_data;
1047 unsigned long flags;
1049 spin_lock_irqsave(&pcistub_devices_lock, flags);
1050 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1051 if (count >= PAGE_SIZE)
1055 dev_data = pci_get_drvdata(psdev->dev);
1059 scnprintf(buf + count, PAGE_SIZE - count,
1060 "%s:%s:%sing:%ld\n",
1061 pci_name(psdev->dev),
1062 dev_data->isr_on ? "on" : "off",
1063 dev_data->ack_intr ? "ack" : "not ack",
1066 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1069 static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
1071 static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
1075 struct pcistub_device *psdev;
1076 struct xen_pcibk_dev_data *dev_data;
1077 int domain, bus, slot, func;
1080 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1084 psdev = pcistub_device_find(domain, bus, slot, func);
1089 dev_data = pci_get_drvdata(psdev->dev);
1093 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
1094 dev_data->irq_name, dev_data->isr_on,
1097 dev_data->isr_on = !(dev_data->isr_on);
1098 if (dev_data->isr_on)
1099 dev_data->ack_intr = 1;
1105 static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL,
1106 pcistub_irq_handler_switch);
1108 static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
1111 int domain, bus, slot, func, reg, size, mask;
1114 err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size,
1119 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1127 static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
1130 unsigned long flags;
1131 struct xen_pcibk_config_quirk *quirk;
1132 struct xen_pcibk_dev_data *dev_data;
1133 const struct config_field *field;
1134 const struct config_field_entry *cfg_entry;
1136 spin_lock_irqsave(&device_ids_lock, flags);
1137 list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
1138 if (count >= PAGE_SIZE)
1141 count += scnprintf(buf + count, PAGE_SIZE - count,
1142 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1143 quirk->pdev->bus->number,
1144 PCI_SLOT(quirk->pdev->devfn),
1145 PCI_FUNC(quirk->pdev->devfn),
1146 quirk->devid.vendor, quirk->devid.device,
1147 quirk->devid.subvendor,
1148 quirk->devid.subdevice);
1150 dev_data = pci_get_drvdata(quirk->pdev);
1152 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1153 field = cfg_entry->field;
1154 if (count >= PAGE_SIZE)
1157 count += scnprintf(buf + count, PAGE_SIZE - count,
1158 "\t\t%08x:%01x:%08x\n",
1159 cfg_entry->base_offset +
1160 field->offset, field->size,
1166 spin_unlock_irqrestore(&device_ids_lock, flags);
1170 static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show,
1173 static ssize_t permissive_add(struct device_driver *drv, const char *buf,
1176 int domain, bus, slot, func;
1178 struct pcistub_device *psdev;
1179 struct xen_pcibk_dev_data *dev_data;
1180 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1183 psdev = pcistub_device_find(domain, bus, slot, func);
1192 dev_data = pci_get_drvdata(psdev->dev);
1193 /* the driver data for a device should never be null at this point */
1198 if (!dev_data->permissive) {
1199 dev_data->permissive = 1;
1200 /* Let user know that what they're doing could be unsafe */
1201 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1202 "configuration space accesses!\n");
1203 dev_warn(&psdev->dev->dev,
1204 "permissive mode is potentially unsafe!\n");
1207 pcistub_device_put(psdev);
1214 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1216 struct pcistub_device *psdev;
1217 struct xen_pcibk_dev_data *dev_data;
1219 unsigned long flags;
1220 spin_lock_irqsave(&pcistub_devices_lock, flags);
1221 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1222 if (count >= PAGE_SIZE)
1226 dev_data = pci_get_drvdata(psdev->dev);
1227 if (!dev_data || !dev_data->permissive)
1230 scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1231 pci_name(psdev->dev));
1233 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1236 static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show,
1239 static void pcistub_exit(void)
1241 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
1242 driver_remove_file(&xen_pcibk_pci_driver.driver,
1243 &driver_attr_remove_slot);
1244 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
1245 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
1246 driver_remove_file(&xen_pcibk_pci_driver.driver,
1247 &driver_attr_permissive);
1248 driver_remove_file(&xen_pcibk_pci_driver.driver,
1249 &driver_attr_irq_handlers);
1250 driver_remove_file(&xen_pcibk_pci_driver.driver,
1251 &driver_attr_irq_handler_state);
1252 pci_unregister_driver(&xen_pcibk_pci_driver);
1255 static int __init pcistub_init(void)
1259 int domain, bus, slot, func;
1262 if (pci_devs_to_hide && *pci_devs_to_hide) {
1266 err = sscanf(pci_devs_to_hide + pos,
1267 " (%x:%x:%x.%x) %n",
1268 &domain, &bus, &slot, &func, &parsed);
1271 err = sscanf(pci_devs_to_hide + pos,
1273 &bus, &slot, &func, &parsed);
1278 err = pcistub_device_id_add(domain, bus, slot, func);
1282 /* if parsed<=0, we've reached the end of the string */
1284 } while (parsed > 0 && pci_devs_to_hide[pos]);
1287 /* If we're the first PCI Device Driver to register, we're the
1288 * first one to get offered PCI devices as they become
1289 * available (and thus we can be the first to grab them)
1291 err = pci_register_driver(&xen_pcibk_pci_driver);
1295 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1296 &driver_attr_new_slot);
1298 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1299 &driver_attr_remove_slot);
1301 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1302 &driver_attr_slots);
1304 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1305 &driver_attr_quirks);
1307 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1308 &driver_attr_permissive);
1311 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1312 &driver_attr_irq_handlers);
1314 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1315 &driver_attr_irq_handler_state);
1323 printk(KERN_ERR DRV_NAME ": Error parsing pci_devs_to_hide at \"%s\"\n",
1324 pci_devs_to_hide + pos);
1330 * fs_initcall happens before device_initcall
1331 * so xen_pcibk *should* get called first (b/c we
1332 * want to suck up any device before other drivers
1333 * get a chance by being the first pci device
1334 * driver to register)
1336 fs_initcall(pcistub_init);
1339 static int __init xen_pcibk_init(void)
1343 if (!xen_initial_domain())
1346 err = xen_pcibk_config_init();
1351 err = pcistub_init();
1356 pcistub_init_devices_late();
1357 err = xen_pcibk_xenbus_register();
1364 static void __exit xen_pcibk_cleanup(void)
1366 xen_pcibk_xenbus_unregister();
1370 module_init(xen_pcibk_init);
1371 module_exit(xen_pcibk_cleanup);
1373 MODULE_LICENSE("Dual BSD/GPL");
1374 MODULE_ALIAS("xen-backend:pci");