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>
20 #include <xen/interface/physdev.h>
22 #include "conf_space.h"
23 #include "conf_space_quirks.h"
25 static char *pci_devs_to_hide;
26 wait_queue_head_t xen_pcibk_aer_wait_queue;
27 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
28 * We want to avoid in middle of AER ops, xen_pcibk devices is being removed
30 static DECLARE_RWSEM(pcistub_sem);
31 module_param_named(hide, pci_devs_to_hide, charp, 0444);
33 struct pcistub_device_id {
34 struct list_head slot_list;
39 static LIST_HEAD(pcistub_device_ids);
40 static DEFINE_SPINLOCK(device_ids_lock);
42 struct pcistub_device {
44 struct list_head dev_list;
48 struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */
51 /* Access to pcistub_devices & seized_devices lists and the initialize_devices
52 * flag must be locked with pcistub_devices_lock
54 static DEFINE_SPINLOCK(pcistub_devices_lock);
55 static LIST_HEAD(pcistub_devices);
57 /* wait for device_initcall before initializing our devices
58 * (see pcistub_init_devices_late)
60 static int initialize_devices;
61 static LIST_HEAD(seized_devices);
63 static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
65 struct pcistub_device *psdev;
67 dev_dbg(&dev->dev, "pcistub_device_alloc\n");
69 psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC);
73 psdev->dev = pci_dev_get(dev);
79 kref_init(&psdev->kref);
80 spin_lock_init(&psdev->lock);
85 /* Don't call this directly as it's called by pcistub_device_put */
86 static void pcistub_device_release(struct kref *kref)
88 struct pcistub_device *psdev;
90 struct xen_pcibk_dev_data *dev_data;
92 psdev = container_of(kref, struct pcistub_device, kref);
94 dev_data = pci_get_drvdata(dev);
96 dev_dbg(&dev->dev, "pcistub_device_release\n");
98 xen_unregister_device_domain_owner(dev);
100 /* Call the reset function which does not take lock as this
101 * is called from "unbind" which takes a device_lock mutex.
103 __pci_reset_function_locked(dev);
104 if (pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state))
105 dev_dbg(&dev->dev, "Could not reload PCI state\n");
107 pci_restore_state(dev);
109 if (pci_find_capability(dev, PCI_CAP_ID_MSIX)) {
110 struct physdev_pci_device ppdev = {
111 .seg = pci_domain_nr(dev->bus),
112 .bus = dev->bus->number,
115 int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix,
119 dev_warn(&dev->dev, "MSI-X release failed (%d)\n",
123 /* Disable the device */
124 xen_pcibk_reset_device(dev);
127 pci_set_drvdata(dev, NULL);
129 /* Clean-up the device */
130 xen_pcibk_config_free_dyn_fields(dev);
131 xen_pcibk_config_free_dev(dev);
133 dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
139 static inline void pcistub_device_get(struct pcistub_device *psdev)
141 kref_get(&psdev->kref);
144 static inline void pcistub_device_put(struct pcistub_device *psdev)
146 kref_put(&psdev->kref, pcistub_device_release);
149 static struct pcistub_device *pcistub_device_find(int domain, int bus,
152 struct pcistub_device *psdev = NULL;
155 spin_lock_irqsave(&pcistub_devices_lock, flags);
157 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
158 if (psdev->dev != NULL
159 && domain == pci_domain_nr(psdev->dev->bus)
160 && bus == psdev->dev->bus->number
161 && slot == PCI_SLOT(psdev->dev->devfn)
162 && func == PCI_FUNC(psdev->dev->devfn)) {
163 pcistub_device_get(psdev);
172 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
176 static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
177 struct pcistub_device *psdev)
179 struct pci_dev *pci_dev = NULL;
182 pcistub_device_get(psdev);
184 spin_lock_irqsave(&psdev->lock, flags);
187 pci_dev = psdev->dev;
189 spin_unlock_irqrestore(&psdev->lock, flags);
192 pcistub_device_put(psdev);
197 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
201 struct pcistub_device *psdev;
202 struct pci_dev *found_dev = NULL;
205 spin_lock_irqsave(&pcistub_devices_lock, flags);
207 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
208 if (psdev->dev != NULL
209 && domain == pci_domain_nr(psdev->dev->bus)
210 && bus == psdev->dev->bus->number
211 && slot == PCI_SLOT(psdev->dev->devfn)
212 && func == PCI_FUNC(psdev->dev->devfn)) {
213 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
218 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
222 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
225 struct pcistub_device *psdev;
226 struct pci_dev *found_dev = NULL;
229 spin_lock_irqsave(&pcistub_devices_lock, flags);
231 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
232 if (psdev->dev == dev) {
233 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
238 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
242 void pcistub_put_pci_dev(struct pci_dev *dev)
244 struct pcistub_device *psdev, *found_psdev = NULL;
247 spin_lock_irqsave(&pcistub_devices_lock, flags);
249 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
250 if (psdev->dev == dev) {
256 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
257 if (WARN_ON(!found_psdev))
260 /*hold this lock for avoiding breaking link between
261 * pcistub and xen_pcibk when AER is in processing
263 down_write(&pcistub_sem);
264 /* Cleanup our device
265 * (so it's ready for the next domain)
268 /* This is OK - we are running from workqueue context
269 * and want to inhibit the user from fiddling with 'reset'
271 pci_reset_function(dev);
272 pci_restore_state(psdev->dev);
274 /* This disables the device. */
275 xen_pcibk_reset_device(found_psdev->dev);
277 /* And cleanup up our emulated fields. */
278 xen_pcibk_config_free_dyn_fields(found_psdev->dev);
279 xen_pcibk_config_reset_dev(found_psdev->dev);
281 xen_unregister_device_domain_owner(found_psdev->dev);
283 spin_lock_irqsave(&found_psdev->lock, flags);
284 found_psdev->pdev = NULL;
285 spin_unlock_irqrestore(&found_psdev->lock, flags);
287 pcistub_device_put(found_psdev);
288 up_write(&pcistub_sem);
291 static int pcistub_match_one(struct pci_dev *dev,
292 struct pcistub_device_id *pdev_id)
294 /* Match the specified device by domain, bus, slot, func and also if
295 * any of the device's parent bridges match.
297 for (; dev != NULL; dev = dev->bus->self) {
298 if (pci_domain_nr(dev->bus) == pdev_id->domain
299 && dev->bus->number == pdev_id->bus
300 && dev->devfn == pdev_id->devfn)
303 /* Sometimes topmost bridge links to itself. */
304 if (dev == dev->bus->self)
311 static int pcistub_match(struct pci_dev *dev)
313 struct pcistub_device_id *pdev_id;
317 spin_lock_irqsave(&device_ids_lock, flags);
318 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
319 if (pcistub_match_one(dev, pdev_id)) {
324 spin_unlock_irqrestore(&device_ids_lock, flags);
329 static int pcistub_init_device(struct pci_dev *dev)
331 struct xen_pcibk_dev_data *dev_data;
334 dev_dbg(&dev->dev, "initializing...\n");
336 /* The PCI backend is not intended to be a module (or to work with
337 * removable PCI devices (yet). If it were, xen_pcibk_config_free()
338 * would need to be called somewhere to free the memory allocated
339 * here and then to call kfree(pci_get_drvdata(psdev->dev)).
341 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
342 + strlen(pci_name(dev)) + 1, GFP_ATOMIC);
347 pci_set_drvdata(dev, dev_data);
350 * Setup name for fake IRQ handler. It will only be enabled
351 * once the device is turned on by the guest.
353 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
355 dev_dbg(&dev->dev, "initializing config\n");
357 init_waitqueue_head(&xen_pcibk_aer_wait_queue);
358 err = xen_pcibk_config_init_dev(dev);
362 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we
363 * must do this here because pcibios_enable_device may specify
364 * the pci device's true irq (and possibly its other resources)
365 * if they differ from what's in the configuration space.
366 * This makes the assumption that the device's resources won't
367 * change after this point (otherwise this code may break!)
369 dev_dbg(&dev->dev, "enabling device\n");
370 err = pci_enable_device(dev);
374 if (pci_find_capability(dev, PCI_CAP_ID_MSIX)) {
375 struct physdev_pci_device ppdev = {
376 .seg = pci_domain_nr(dev->bus),
377 .bus = dev->bus->number,
381 err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev);
383 dev_err(&dev->dev, "MSI-X preparation failed (%d)\n",
387 /* We need the device active to save the state. */
388 dev_dbg(&dev->dev, "save state of device\n");
390 dev_data->pci_saved_state = pci_store_saved_state(dev);
391 if (!dev_data->pci_saved_state)
392 dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
394 dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n");
395 __pci_reset_function_locked(dev);
396 pci_restore_state(dev);
398 /* Now disable the device (this also ensures some private device
399 * data is setup before we export)
401 dev_dbg(&dev->dev, "reset device\n");
402 xen_pcibk_reset_device(dev);
404 dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
408 xen_pcibk_config_free_dev(dev);
411 pci_set_drvdata(dev, NULL);
417 * Because some initialization still happens on
418 * devices during fs_initcall, we need to defer
419 * full initialization of our devices until
422 static int __init pcistub_init_devices_late(void)
424 struct pcistub_device *psdev;
428 pr_debug(DRV_NAME ": pcistub_init_devices_late\n");
430 spin_lock_irqsave(&pcistub_devices_lock, flags);
432 while (!list_empty(&seized_devices)) {
433 psdev = container_of(seized_devices.next,
434 struct pcistub_device, dev_list);
435 list_del(&psdev->dev_list);
437 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
439 err = pcistub_init_device(psdev->dev);
441 dev_err(&psdev->dev->dev,
442 "error %d initializing device\n", err);
447 spin_lock_irqsave(&pcistub_devices_lock, flags);
450 list_add_tail(&psdev->dev_list, &pcistub_devices);
453 initialize_devices = 1;
455 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
460 static int pcistub_seize(struct pci_dev *dev)
462 struct pcistub_device *psdev;
466 psdev = pcistub_device_alloc(dev);
470 spin_lock_irqsave(&pcistub_devices_lock, flags);
472 if (initialize_devices) {
473 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
475 /* don't want irqs disabled when calling pcistub_init_device */
476 err = pcistub_init_device(psdev->dev);
478 spin_lock_irqsave(&pcistub_devices_lock, flags);
481 list_add(&psdev->dev_list, &pcistub_devices);
483 dev_dbg(&dev->dev, "deferring initialization\n");
484 list_add(&psdev->dev_list, &seized_devices);
487 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
490 pcistub_device_put(psdev);
495 static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
499 dev_dbg(&dev->dev, "probing...\n");
501 if (pcistub_match(dev)) {
503 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
504 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
505 dev_err(&dev->dev, "can't export pci devices that "
506 "don't have a normal (0) or bridge (1) "
512 dev_info(&dev->dev, "seizing device\n");
513 err = pcistub_seize(dev);
515 /* Didn't find the device */
522 static void pcistub_remove(struct pci_dev *dev)
524 struct pcistub_device *psdev, *found_psdev = NULL;
527 dev_dbg(&dev->dev, "removing\n");
529 spin_lock_irqsave(&pcistub_devices_lock, flags);
531 xen_pcibk_config_quirk_release(dev);
533 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
534 if (psdev->dev == dev) {
540 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
543 dev_dbg(&dev->dev, "found device to remove - in use? %p\n",
546 if (found_psdev->pdev) {
547 printk(KERN_WARNING DRV_NAME ": ****** removing device "
548 "%s while still in-use! ******\n",
549 pci_name(found_psdev->dev));
550 printk(KERN_WARNING DRV_NAME ": ****** driver domain may"
551 " still access this device's i/o resources!\n");
552 printk(KERN_WARNING DRV_NAME ": ****** shutdown driver "
553 "domain before binding device\n");
554 printk(KERN_WARNING DRV_NAME ": ****** to other drivers "
557 xen_pcibk_release_pci_dev(found_psdev->pdev,
561 spin_lock_irqsave(&pcistub_devices_lock, flags);
562 list_del(&found_psdev->dev_list);
563 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
565 /* the final put for releasing from the list */
566 pcistub_device_put(found_psdev);
570 static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = {
572 .vendor = PCI_ANY_ID,
573 .device = PCI_ANY_ID,
574 .subvendor = PCI_ANY_ID,
575 .subdevice = PCI_ANY_ID,
580 #define PCI_NODENAME_MAX 40
581 static void kill_domain_by_device(struct pcistub_device *psdev)
583 struct xenbus_transaction xbt;
585 char nodename[PCI_NODENAME_MAX];
588 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
589 psdev->pdev->xdev->otherend_id);
592 err = xenbus_transaction_start(&xbt);
594 dev_err(&psdev->dev->dev,
595 "error %d when start xenbus transaction\n", err);
598 /*PV AER handlers will set this flag*/
599 xenbus_printf(xbt, nodename, "aerState" , "aerfail");
600 err = xenbus_transaction_end(xbt, 0);
604 dev_err(&psdev->dev->dev,
605 "error %d when end xenbus transaction\n", err);
610 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
611 * backend need to have cooperation. In xen_pcibk, those steps will do similar
612 * jobs: send service request and waiting for front_end response.
614 static pci_ers_result_t common_process(struct pcistub_device *psdev,
615 pci_channel_state_t state, int aer_cmd,
616 pci_ers_result_t result)
618 pci_ers_result_t res = result;
619 struct xen_pcie_aer_op *aer_op;
622 /*with PV AER drivers*/
623 aer_op = &(psdev->pdev->sh_info->aer_op);
624 aer_op->cmd = aer_cmd ;
625 /*useful for error_detected callback*/
628 ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
629 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
631 dev_err(&psdev->dev->dev,
632 DRV_NAME ": failed to get pcifront device\n");
633 return PCI_ERS_RESULT_NONE;
637 dev_dbg(&psdev->dev->dev,
638 DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n",
639 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
640 /*local flag to mark there's aer request, xen_pcibk callback will use
641 * this flag to judge whether we need to check pci-front give aer
644 set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
646 /*It is possible that a pcifront conf_read_write ops request invokes
647 * the callback which cause the spurious execution of wake_up.
648 * Yet it is harmless and better than a spinlock here
650 set_bit(_XEN_PCIB_active,
651 (unsigned long *)&psdev->pdev->sh_info->flags);
653 notify_remote_via_irq(psdev->pdev->evtchn_irq);
655 ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
656 !(test_bit(_XEN_PCIB_active, (unsigned long *)
657 &psdev->pdev->sh_info->flags)), 300*HZ);
660 if (test_bit(_XEN_PCIB_active,
661 (unsigned long *)&psdev->pdev->sh_info->flags)) {
662 dev_err(&psdev->dev->dev,
663 "pcifront aer process not responding!\n");
664 clear_bit(_XEN_PCIB_active,
665 (unsigned long *)&psdev->pdev->sh_info->flags);
666 aer_op->err = PCI_ERS_RESULT_NONE;
670 clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
672 if (test_bit(_XEN_PCIF_active,
673 (unsigned long *)&psdev->pdev->sh_info->flags)) {
674 dev_dbg(&psdev->dev->dev,
675 "schedule pci_conf service in " DRV_NAME "\n");
676 xen_pcibk_test_and_schedule_op(psdev->pdev);
679 res = (pci_ers_result_t)aer_op->err;
684 * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case
685 * of the device driver could provide this service, and then wait for pcifront
687 * @dev: pointer to PCI devices
688 * return value is used by aer_core do_recovery policy
690 static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
692 struct pcistub_device *psdev;
693 pci_ers_result_t result;
695 result = PCI_ERS_RESULT_RECOVERED;
696 dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
697 dev->bus->number, dev->devfn);
699 down_write(&pcistub_sem);
700 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
702 PCI_SLOT(dev->devfn),
703 PCI_FUNC(dev->devfn));
705 if (!psdev || !psdev->pdev) {
707 DRV_NAME " device is not found/assigned\n");
711 if (!psdev->pdev->sh_info) {
712 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
713 " by HVM, kill it\n");
714 kill_domain_by_device(psdev);
718 if (!test_bit(_XEN_PCIB_AERHANDLER,
719 (unsigned long *)&psdev->pdev->sh_info->flags)) {
721 "guest with no AER driver should have been killed\n");
724 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
726 if (result == PCI_ERS_RESULT_NONE ||
727 result == PCI_ERS_RESULT_DISCONNECT) {
729 "No AER slot_reset service or disconnected!\n");
730 kill_domain_by_device(psdev);
734 pcistub_device_put(psdev);
735 up_write(&pcistub_sem);
741 /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront
742 * in case of the device driver could provide this service, and then wait
744 * @dev: pointer to PCI devices
745 * return value is used by aer_core do_recovery policy
748 static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
750 struct pcistub_device *psdev;
751 pci_ers_result_t result;
753 result = PCI_ERS_RESULT_RECOVERED;
754 dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
755 dev->bus->number, dev->devfn);
757 down_write(&pcistub_sem);
758 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
760 PCI_SLOT(dev->devfn),
761 PCI_FUNC(dev->devfn));
763 if (!psdev || !psdev->pdev) {
765 DRV_NAME " device is not found/assigned\n");
769 if (!psdev->pdev->sh_info) {
770 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
771 " by HVM, kill it\n");
772 kill_domain_by_device(psdev);
776 if (!test_bit(_XEN_PCIB_AERHANDLER,
777 (unsigned long *)&psdev->pdev->sh_info->flags)) {
779 "guest with no AER driver should have been killed\n");
782 result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
784 if (result == PCI_ERS_RESULT_NONE ||
785 result == PCI_ERS_RESULT_DISCONNECT) {
787 "No AER mmio_enabled service or disconnected!\n");
788 kill_domain_by_device(psdev);
792 pcistub_device_put(psdev);
793 up_write(&pcistub_sem);
797 /*xen_pcibk_error_detected: it will send the error_detected request to pcifront
798 * in case of the device driver could provide this service, and then wait
800 * @dev: pointer to PCI devices
801 * @error: the current PCI connection state
802 * return value is used by aer_core do_recovery policy
805 static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev,
806 pci_channel_state_t error)
808 struct pcistub_device *psdev;
809 pci_ers_result_t result;
811 result = PCI_ERS_RESULT_CAN_RECOVER;
812 dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n",
813 dev->bus->number, dev->devfn);
815 down_write(&pcistub_sem);
816 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
818 PCI_SLOT(dev->devfn),
819 PCI_FUNC(dev->devfn));
821 if (!psdev || !psdev->pdev) {
823 DRV_NAME " device is not found/assigned\n");
827 if (!psdev->pdev->sh_info) {
828 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
829 " by HVM, kill it\n");
830 kill_domain_by_device(psdev);
834 /*Guest owns the device yet no aer handler regiested, kill guest*/
835 if (!test_bit(_XEN_PCIB_AERHANDLER,
836 (unsigned long *)&psdev->pdev->sh_info->flags)) {
837 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
838 kill_domain_by_device(psdev);
841 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
843 if (result == PCI_ERS_RESULT_NONE ||
844 result == PCI_ERS_RESULT_DISCONNECT) {
846 "No AER error_detected service or disconnected!\n");
847 kill_domain_by_device(psdev);
851 pcistub_device_put(psdev);
852 up_write(&pcistub_sem);
856 /*xen_pcibk_error_resume: it will send the error_resume request to pcifront
857 * in case of the device driver could provide this service, and then wait
859 * @dev: pointer to PCI devices
862 static void xen_pcibk_error_resume(struct pci_dev *dev)
864 struct pcistub_device *psdev;
866 dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
867 dev->bus->number, dev->devfn);
869 down_write(&pcistub_sem);
870 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
872 PCI_SLOT(dev->devfn),
873 PCI_FUNC(dev->devfn));
875 if (!psdev || !psdev->pdev) {
877 DRV_NAME " device is not found/assigned\n");
881 if (!psdev->pdev->sh_info) {
882 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
883 " by HVM, kill it\n");
884 kill_domain_by_device(psdev);
888 if (!test_bit(_XEN_PCIB_AERHANDLER,
889 (unsigned long *)&psdev->pdev->sh_info->flags)) {
891 "guest with no AER driver should have been killed\n");
892 kill_domain_by_device(psdev);
895 common_process(psdev, 1, XEN_PCI_OP_aer_resume,
896 PCI_ERS_RESULT_RECOVERED);
899 pcistub_device_put(psdev);
900 up_write(&pcistub_sem);
904 /*add xen_pcibk AER handling*/
905 static const struct pci_error_handlers xen_pcibk_error_handler = {
906 .error_detected = xen_pcibk_error_detected,
907 .mmio_enabled = xen_pcibk_mmio_enabled,
908 .slot_reset = xen_pcibk_slot_reset,
909 .resume = xen_pcibk_error_resume,
913 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
914 * for a normal device. I don't want it to be loaded automatically.
917 static struct pci_driver xen_pcibk_pci_driver = {
918 /* The name should be xen_pciback, but until the tools are updated
919 * we will keep it as pciback. */
921 .id_table = pcistub_ids,
922 .probe = pcistub_probe,
923 .remove = pcistub_remove,
924 .err_handler = &xen_pcibk_error_handler,
927 static inline int str_to_slot(const char *buf, int *domain, int *bus,
928 int *slot, int *func)
932 switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func,
936 sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed);
940 sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed);
943 if (parsed && !buf[parsed])
946 /* try again without domain */
948 switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) {
951 sscanf(buf, " %x:%x.* %n", bus, slot, &parsed);
955 sscanf(buf, " %x:*.* %n", bus, &parsed);
958 if (parsed && !buf[parsed])
964 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
965 *slot, int *func, int *reg, int *size, int *mask)
969 sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func,
970 reg, size, mask, &parsed);
971 if (parsed && !buf[parsed])
974 /* try again without domain */
976 sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size,
978 if (parsed && !buf[parsed])
984 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
986 struct pcistub_device_id *pci_dev_id;
988 int rc = 0, devfn = PCI_DEVFN(slot, func);
991 for (slot = 0; !rc && slot < 32; ++slot)
992 rc = pcistub_device_id_add(domain, bus, slot, func);
997 for (func = 0; !rc && func < 8; ++func)
998 rc = pcistub_device_id_add(domain, bus, slot, func);
1003 #if !defined(MODULE) /* pci_domains_supported is not being exported */ \
1004 || !defined(CONFIG_PCI_DOMAINS)
1005 !pci_domains_supported ? domain :
1007 domain < 0 || domain > 0xffff)
1008 || bus < 0 || bus > 0xff
1009 || PCI_SLOT(devfn) != slot
1010 || PCI_FUNC(devfn) != func)
1013 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
1017 pci_dev_id->domain = domain;
1018 pci_dev_id->bus = bus;
1019 pci_dev_id->devfn = devfn;
1021 pr_debug(DRV_NAME ": wants to seize %04x:%02x:%02x.%d\n",
1022 domain, bus, slot, func);
1024 spin_lock_irqsave(&device_ids_lock, flags);
1025 list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids);
1026 spin_unlock_irqrestore(&device_ids_lock, flags);
1031 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
1033 struct pcistub_device_id *pci_dev_id, *t;
1035 unsigned long flags;
1037 spin_lock_irqsave(&device_ids_lock, flags);
1038 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
1040 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus
1041 && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot)
1042 && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) {
1043 /* Don't break; here because it's possible the same
1044 * slot could be in the list more than once
1046 list_del(&pci_dev_id->slot_list);
1051 pr_debug(DRV_NAME ": removed %04x:%02x:%02x.%d from "
1052 "seize list\n", domain, bus, slot, func);
1055 spin_unlock_irqrestore(&device_ids_lock, flags);
1060 static int pcistub_reg_add(int domain, int bus, int slot, int func,
1061 unsigned int reg, unsigned int size,
1065 struct pcistub_device *psdev;
1066 struct pci_dev *dev;
1067 struct config_field *field;
1069 if (reg > 0xfff || (size < 4 && (mask >> (size * 8))))
1072 psdev = pcistub_device_find(domain, bus, slot, func);
1079 field = kzalloc(sizeof(*field), GFP_ATOMIC);
1085 field->offset = reg;
1089 field->reset = NULL;
1090 field->release = NULL;
1091 field->clean = xen_pcibk_config_field_free;
1093 err = xen_pcibk_config_quirks_add_field(dev, field);
1098 pcistub_device_put(psdev);
1102 static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
1105 int domain, bus, slot, func;
1108 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1112 err = pcistub_device_id_add(domain, bus, slot, func);
1119 static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
1121 static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
1124 int domain, bus, slot, func;
1127 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1131 err = pcistub_device_id_remove(domain, bus, slot, func);
1138 static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
1140 static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
1142 struct pcistub_device_id *pci_dev_id;
1144 unsigned long flags;
1146 spin_lock_irqsave(&device_ids_lock, flags);
1147 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1148 if (count >= PAGE_SIZE)
1151 count += scnprintf(buf + count, PAGE_SIZE - count,
1152 "%04x:%02x:%02x.%d\n",
1153 pci_dev_id->domain, pci_dev_id->bus,
1154 PCI_SLOT(pci_dev_id->devfn),
1155 PCI_FUNC(pci_dev_id->devfn));
1157 spin_unlock_irqrestore(&device_ids_lock, flags);
1161 static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
1163 static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
1165 struct pcistub_device *psdev;
1166 struct xen_pcibk_dev_data *dev_data;
1168 unsigned long flags;
1170 spin_lock_irqsave(&pcistub_devices_lock, flags);
1171 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1172 if (count >= PAGE_SIZE)
1176 dev_data = pci_get_drvdata(psdev->dev);
1180 scnprintf(buf + count, PAGE_SIZE - count,
1181 "%s:%s:%sing:%ld\n",
1182 pci_name(psdev->dev),
1183 dev_data->isr_on ? "on" : "off",
1184 dev_data->ack_intr ? "ack" : "not ack",
1187 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1190 static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
1192 static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
1196 struct pcistub_device *psdev;
1197 struct xen_pcibk_dev_data *dev_data;
1198 int domain, bus, slot, func;
1201 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1205 psdev = pcistub_device_find(domain, bus, slot, func);
1209 dev_data = pci_get_drvdata(psdev->dev);
1213 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
1214 dev_data->irq_name, dev_data->isr_on,
1217 dev_data->isr_on = !(dev_data->isr_on);
1218 if (dev_data->isr_on)
1219 dev_data->ack_intr = 1;
1222 pcistub_device_put(psdev);
1227 static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL,
1228 pcistub_irq_handler_switch);
1230 static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
1233 int domain, bus, slot, func, reg, size, mask;
1236 err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size,
1241 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1249 static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
1252 unsigned long flags;
1253 struct xen_pcibk_config_quirk *quirk;
1254 struct xen_pcibk_dev_data *dev_data;
1255 const struct config_field *field;
1256 const struct config_field_entry *cfg_entry;
1258 spin_lock_irqsave(&device_ids_lock, flags);
1259 list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
1260 if (count >= PAGE_SIZE)
1263 count += scnprintf(buf + count, PAGE_SIZE - count,
1264 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1265 quirk->pdev->bus->number,
1266 PCI_SLOT(quirk->pdev->devfn),
1267 PCI_FUNC(quirk->pdev->devfn),
1268 quirk->devid.vendor, quirk->devid.device,
1269 quirk->devid.subvendor,
1270 quirk->devid.subdevice);
1272 dev_data = pci_get_drvdata(quirk->pdev);
1274 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1275 field = cfg_entry->field;
1276 if (count >= PAGE_SIZE)
1279 count += scnprintf(buf + count, PAGE_SIZE - count,
1280 "\t\t%08x:%01x:%08x\n",
1281 cfg_entry->base_offset +
1282 field->offset, field->size,
1288 spin_unlock_irqrestore(&device_ids_lock, flags);
1292 static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show,
1295 static ssize_t permissive_add(struct device_driver *drv, const char *buf,
1298 int domain, bus, slot, func;
1300 struct pcistub_device *psdev;
1301 struct xen_pcibk_dev_data *dev_data;
1303 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1307 psdev = pcistub_device_find(domain, bus, slot, func);
1313 dev_data = pci_get_drvdata(psdev->dev);
1314 /* the driver data for a device should never be null at this point */
1319 if (!dev_data->permissive) {
1320 dev_data->permissive = 1;
1321 /* Let user know that what they're doing could be unsafe */
1322 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1323 "configuration space accesses!\n");
1324 dev_warn(&psdev->dev->dev,
1325 "permissive mode is potentially unsafe!\n");
1328 pcistub_device_put(psdev);
1335 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1337 struct pcistub_device *psdev;
1338 struct xen_pcibk_dev_data *dev_data;
1340 unsigned long flags;
1341 spin_lock_irqsave(&pcistub_devices_lock, flags);
1342 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1343 if (count >= PAGE_SIZE)
1347 dev_data = pci_get_drvdata(psdev->dev);
1348 if (!dev_data || !dev_data->permissive)
1351 scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1352 pci_name(psdev->dev));
1354 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1357 static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show,
1360 static void pcistub_exit(void)
1362 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
1363 driver_remove_file(&xen_pcibk_pci_driver.driver,
1364 &driver_attr_remove_slot);
1365 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
1366 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
1367 driver_remove_file(&xen_pcibk_pci_driver.driver,
1368 &driver_attr_permissive);
1369 driver_remove_file(&xen_pcibk_pci_driver.driver,
1370 &driver_attr_irq_handlers);
1371 driver_remove_file(&xen_pcibk_pci_driver.driver,
1372 &driver_attr_irq_handler_state);
1373 pci_unregister_driver(&xen_pcibk_pci_driver);
1376 static int __init pcistub_init(void)
1380 int domain, bus, slot, func;
1383 if (pci_devs_to_hide && *pci_devs_to_hide) {
1387 err = sscanf(pci_devs_to_hide + pos,
1388 " (%x:%x:%x.%x) %n",
1389 &domain, &bus, &slot, &func, &parsed);
1393 sscanf(pci_devs_to_hide + pos,
1395 &domain, &bus, &slot, &parsed);
1399 sscanf(pci_devs_to_hide + pos,
1401 &domain, &bus, &parsed);
1407 err = sscanf(pci_devs_to_hide + pos,
1409 &bus, &slot, &func, &parsed);
1413 sscanf(pci_devs_to_hide + pos,
1415 &bus, &slot, &parsed);
1419 sscanf(pci_devs_to_hide + pos,
1429 err = pcistub_device_id_add(domain, bus, slot, func);
1434 } while (pci_devs_to_hide[pos]);
1437 /* If we're the first PCI Device Driver to register, we're the
1438 * first one to get offered PCI devices as they become
1439 * available (and thus we can be the first to grab them)
1441 err = pci_register_driver(&xen_pcibk_pci_driver);
1445 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1446 &driver_attr_new_slot);
1448 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1449 &driver_attr_remove_slot);
1451 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1452 &driver_attr_slots);
1454 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1455 &driver_attr_quirks);
1457 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1458 &driver_attr_permissive);
1461 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1462 &driver_attr_irq_handlers);
1464 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1465 &driver_attr_irq_handler_state);
1473 printk(KERN_ERR DRV_NAME ": Error parsing pci_devs_to_hide at \"%s\"\n",
1474 pci_devs_to_hide + pos);
1480 * fs_initcall happens before device_initcall
1481 * so xen_pcibk *should* get called first (b/c we
1482 * want to suck up any device before other drivers
1483 * get a chance by being the first pci device
1484 * driver to register)
1486 fs_initcall(pcistub_init);
1489 static int __init xen_pcibk_init(void)
1493 if (!xen_initial_domain())
1496 err = xen_pcibk_config_init();
1501 err = pcistub_init();
1506 pcistub_init_devices_late();
1507 err = xen_pcibk_xenbus_register();
1514 static void __exit xen_pcibk_cleanup(void)
1516 xen_pcibk_xenbus_unregister();
1520 module_init(xen_pcibk_init);
1521 module_exit(xen_pcibk_cleanup);
1523 MODULE_LICENSE("Dual BSD/GPL");
1524 MODULE_ALIAS("xen-backend:pci");