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;
88 struct xen_pcibk_dev_data *dev_data;
90 psdev = container_of(kref, struct pcistub_device, kref);
91 dev_data = pci_get_drvdata(psdev->dev);
93 dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
95 xen_unregister_device_domain_owner(psdev->dev);
97 /* Call the reset function which does not take lock as this
98 * is called from "unbind" which takes a device_lock mutex.
100 __pci_reset_function_locked(psdev->dev);
101 if (pci_load_and_free_saved_state(psdev->dev,
102 &dev_data->pci_saved_state)) {
103 dev_dbg(&psdev->dev->dev, "Could not reload PCI state\n");
105 pci_restore_state(psdev->dev);
107 /* Disable the device */
108 xen_pcibk_reset_device(psdev->dev);
111 pci_set_drvdata(psdev->dev, NULL);
113 /* Clean-up the device */
114 xen_pcibk_config_free_dyn_fields(psdev->dev);
115 xen_pcibk_config_free_dev(psdev->dev);
117 psdev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
118 pci_dev_put(psdev->dev);
123 static inline void pcistub_device_get(struct pcistub_device *psdev)
125 kref_get(&psdev->kref);
128 static inline void pcistub_device_put(struct pcistub_device *psdev)
130 kref_put(&psdev->kref, pcistub_device_release);
133 static struct pcistub_device *pcistub_device_find(int domain, int bus,
136 struct pcistub_device *psdev = NULL;
139 spin_lock_irqsave(&pcistub_devices_lock, flags);
141 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
142 if (psdev->dev != NULL
143 && domain == pci_domain_nr(psdev->dev->bus)
144 && bus == psdev->dev->bus->number
145 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
146 pcistub_device_get(psdev);
155 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
159 static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
160 struct pcistub_device *psdev)
162 struct pci_dev *pci_dev = NULL;
165 pcistub_device_get(psdev);
167 spin_lock_irqsave(&psdev->lock, flags);
170 pci_dev = psdev->dev;
172 spin_unlock_irqrestore(&psdev->lock, flags);
175 pcistub_device_put(psdev);
180 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
184 struct pcistub_device *psdev;
185 struct pci_dev *found_dev = NULL;
188 spin_lock_irqsave(&pcistub_devices_lock, flags);
190 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
191 if (psdev->dev != NULL
192 && domain == pci_domain_nr(psdev->dev->bus)
193 && bus == psdev->dev->bus->number
194 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
195 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
200 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
204 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
207 struct pcistub_device *psdev;
208 struct pci_dev *found_dev = NULL;
211 spin_lock_irqsave(&pcistub_devices_lock, flags);
213 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
214 if (psdev->dev == dev) {
215 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
220 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
224 void pcistub_put_pci_dev(struct pci_dev *dev)
226 struct pcistub_device *psdev, *found_psdev = NULL;
229 spin_lock_irqsave(&pcistub_devices_lock, flags);
231 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
232 if (psdev->dev == dev) {
238 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
239 if (WARN_ON(!found_psdev))
242 /*hold this lock for avoiding breaking link between
243 * pcistub and xen_pcibk when AER is in processing
245 down_write(&pcistub_sem);
246 /* Cleanup our device
247 * (so it's ready for the next domain)
250 /* This is OK - we are running from workqueue context
251 * and want to inhibit the user from fiddling with 'reset'
253 pci_reset_function(dev);
254 pci_restore_state(psdev->dev);
256 /* This disables the device. */
257 xen_pcibk_reset_device(found_psdev->dev);
259 /* And cleanup up our emulated fields. */
260 xen_pcibk_config_free_dyn_fields(found_psdev->dev);
261 xen_pcibk_config_reset_dev(found_psdev->dev);
263 xen_unregister_device_domain_owner(found_psdev->dev);
265 spin_lock_irqsave(&found_psdev->lock, flags);
266 found_psdev->pdev = NULL;
267 spin_unlock_irqrestore(&found_psdev->lock, flags);
269 pcistub_device_put(found_psdev);
270 up_write(&pcistub_sem);
273 static int __devinit pcistub_match_one(struct pci_dev *dev,
274 struct pcistub_device_id *pdev_id)
276 /* Match the specified device by domain, bus, slot, func and also if
277 * any of the device's parent bridges match.
279 for (; dev != NULL; dev = dev->bus->self) {
280 if (pci_domain_nr(dev->bus) == pdev_id->domain
281 && dev->bus->number == pdev_id->bus
282 && dev->devfn == pdev_id->devfn)
285 /* Sometimes topmost bridge links to itself. */
286 if (dev == dev->bus->self)
293 static int __devinit pcistub_match(struct pci_dev *dev)
295 struct pcistub_device_id *pdev_id;
299 spin_lock_irqsave(&device_ids_lock, flags);
300 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
301 if (pcistub_match_one(dev, pdev_id)) {
306 spin_unlock_irqrestore(&device_ids_lock, flags);
311 static int __devinit pcistub_init_device(struct pci_dev *dev)
313 struct xen_pcibk_dev_data *dev_data;
316 dev_dbg(&dev->dev, "initializing...\n");
318 /* The PCI backend is not intended to be a module (or to work with
319 * removable PCI devices (yet). If it were, xen_pcibk_config_free()
320 * would need to be called somewhere to free the memory allocated
321 * here and then to call kfree(pci_get_drvdata(psdev->dev)).
323 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
324 + strlen(pci_name(dev)) + 1, GFP_ATOMIC);
329 pci_set_drvdata(dev, dev_data);
332 * Setup name for fake IRQ handler. It will only be enabled
333 * once the device is turned on by the guest.
335 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
337 dev_dbg(&dev->dev, "initializing config\n");
339 init_waitqueue_head(&xen_pcibk_aer_wait_queue);
340 err = xen_pcibk_config_init_dev(dev);
344 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we
345 * must do this here because pcibios_enable_device may specify
346 * the pci device's true irq (and possibly its other resources)
347 * if they differ from what's in the configuration space.
348 * This makes the assumption that the device's resources won't
349 * change after this point (otherwise this code may break!)
351 dev_dbg(&dev->dev, "enabling device\n");
352 err = pci_enable_device(dev);
356 dev_dbg(&dev->dev, "reseting (FLR, D3, etc) the device\n");
357 __pci_reset_function_locked(dev);
359 /* We need the device active to save the state. */
360 dev_dbg(&dev->dev, "save state of device\n");
362 dev_data->pci_saved_state = pci_store_saved_state(dev);
363 if (!dev_data->pci_saved_state)
364 dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
366 /* Now disable the device (this also ensures some private device
367 * data is setup before we export)
369 dev_dbg(&dev->dev, "reset device\n");
370 xen_pcibk_reset_device(dev);
372 dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
376 xen_pcibk_config_free_dev(dev);
379 pci_set_drvdata(dev, NULL);
385 * Because some initialization still happens on
386 * devices during fs_initcall, we need to defer
387 * full initialization of our devices until
390 static int __init pcistub_init_devices_late(void)
392 struct pcistub_device *psdev;
396 pr_debug(DRV_NAME ": pcistub_init_devices_late\n");
398 spin_lock_irqsave(&pcistub_devices_lock, flags);
400 while (!list_empty(&seized_devices)) {
401 psdev = container_of(seized_devices.next,
402 struct pcistub_device, dev_list);
403 list_del(&psdev->dev_list);
405 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
407 err = pcistub_init_device(psdev->dev);
409 dev_err(&psdev->dev->dev,
410 "error %d initializing device\n", err);
415 spin_lock_irqsave(&pcistub_devices_lock, flags);
418 list_add_tail(&psdev->dev_list, &pcistub_devices);
421 initialize_devices = 1;
423 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
428 static int __devinit pcistub_seize(struct pci_dev *dev)
430 struct pcistub_device *psdev;
434 psdev = pcistub_device_alloc(dev);
438 spin_lock_irqsave(&pcistub_devices_lock, flags);
440 if (initialize_devices) {
441 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
443 /* don't want irqs disabled when calling pcistub_init_device */
444 err = pcistub_init_device(psdev->dev);
446 spin_lock_irqsave(&pcistub_devices_lock, flags);
449 list_add(&psdev->dev_list, &pcistub_devices);
451 dev_dbg(&dev->dev, "deferring initialization\n");
452 list_add(&psdev->dev_list, &seized_devices);
455 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
458 pcistub_device_put(psdev);
463 static int __devinit pcistub_probe(struct pci_dev *dev,
464 const struct pci_device_id *id)
468 dev_dbg(&dev->dev, "probing...\n");
470 if (pcistub_match(dev)) {
472 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
473 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
474 dev_err(&dev->dev, "can't export pci devices that "
475 "don't have a normal (0) or bridge (1) "
481 dev_info(&dev->dev, "seizing device\n");
482 err = pcistub_seize(dev);
484 /* Didn't find the device */
491 static void pcistub_remove(struct pci_dev *dev)
493 struct pcistub_device *psdev, *found_psdev = NULL;
496 dev_dbg(&dev->dev, "removing\n");
498 spin_lock_irqsave(&pcistub_devices_lock, flags);
500 xen_pcibk_config_quirk_release(dev);
502 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
503 if (psdev->dev == dev) {
509 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
512 dev_dbg(&dev->dev, "found device to remove - in use? %p\n",
515 if (found_psdev->pdev) {
516 printk(KERN_WARNING DRV_NAME ": ****** removing device "
517 "%s while still in-use! ******\n",
518 pci_name(found_psdev->dev));
519 printk(KERN_WARNING DRV_NAME ": ****** driver domain may"
520 " still access this device's i/o resources!\n");
521 printk(KERN_WARNING DRV_NAME ": ****** shutdown driver "
522 "domain before binding device\n");
523 printk(KERN_WARNING DRV_NAME ": ****** to other drivers "
526 xen_pcibk_release_pci_dev(found_psdev->pdev,
530 spin_lock_irqsave(&pcistub_devices_lock, flags);
531 list_del(&found_psdev->dev_list);
532 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
534 /* the final put for releasing from the list */
535 pcistub_device_put(found_psdev);
539 static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = {
541 .vendor = PCI_ANY_ID,
542 .device = PCI_ANY_ID,
543 .subvendor = PCI_ANY_ID,
544 .subdevice = PCI_ANY_ID,
549 #define PCI_NODENAME_MAX 40
550 static void kill_domain_by_device(struct pcistub_device *psdev)
552 struct xenbus_transaction xbt;
554 char nodename[PCI_NODENAME_MAX];
557 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
558 psdev->pdev->xdev->otherend_id);
561 err = xenbus_transaction_start(&xbt);
563 dev_err(&psdev->dev->dev,
564 "error %d when start xenbus transaction\n", err);
567 /*PV AER handlers will set this flag*/
568 xenbus_printf(xbt, nodename, "aerState" , "aerfail");
569 err = xenbus_transaction_end(xbt, 0);
573 dev_err(&psdev->dev->dev,
574 "error %d when end xenbus transaction\n", err);
579 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
580 * backend need to have cooperation. In xen_pcibk, those steps will do similar
581 * jobs: send service request and waiting for front_end response.
583 static pci_ers_result_t common_process(struct pcistub_device *psdev,
584 pci_channel_state_t state, int aer_cmd,
585 pci_ers_result_t result)
587 pci_ers_result_t res = result;
588 struct xen_pcie_aer_op *aer_op;
591 /*with PV AER drivers*/
592 aer_op = &(psdev->pdev->sh_info->aer_op);
593 aer_op->cmd = aer_cmd ;
594 /*useful for error_detected callback*/
597 ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
598 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
600 dev_err(&psdev->dev->dev,
601 DRV_NAME ": failed to get pcifront device\n");
602 return PCI_ERS_RESULT_NONE;
606 dev_dbg(&psdev->dev->dev,
607 DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n",
608 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
609 /*local flag to mark there's aer request, xen_pcibk callback will use
610 * this flag to judge whether we need to check pci-front give aer
613 set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
615 /*It is possible that a pcifront conf_read_write ops request invokes
616 * the callback which cause the spurious execution of wake_up.
617 * Yet it is harmless and better than a spinlock here
619 set_bit(_XEN_PCIB_active,
620 (unsigned long *)&psdev->pdev->sh_info->flags);
622 notify_remote_via_irq(psdev->pdev->evtchn_irq);
624 ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
625 !(test_bit(_XEN_PCIB_active, (unsigned long *)
626 &psdev->pdev->sh_info->flags)), 300*HZ);
629 if (test_bit(_XEN_PCIB_active,
630 (unsigned long *)&psdev->pdev->sh_info->flags)) {
631 dev_err(&psdev->dev->dev,
632 "pcifront aer process not responding!\n");
633 clear_bit(_XEN_PCIB_active,
634 (unsigned long *)&psdev->pdev->sh_info->flags);
635 aer_op->err = PCI_ERS_RESULT_NONE;
639 clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
641 if (test_bit(_XEN_PCIF_active,
642 (unsigned long *)&psdev->pdev->sh_info->flags)) {
643 dev_dbg(&psdev->dev->dev,
644 "schedule pci_conf service in " DRV_NAME "\n");
645 xen_pcibk_test_and_schedule_op(psdev->pdev);
648 res = (pci_ers_result_t)aer_op->err;
653 * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case
654 * of the device driver could provide this service, and then wait for pcifront
656 * @dev: pointer to PCI devices
657 * return value is used by aer_core do_recovery policy
659 static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
661 struct pcistub_device *psdev;
662 pci_ers_result_t result;
664 result = PCI_ERS_RESULT_RECOVERED;
665 dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
666 dev->bus->number, dev->devfn);
668 down_write(&pcistub_sem);
669 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
671 PCI_SLOT(dev->devfn),
672 PCI_FUNC(dev->devfn));
674 if (!psdev || !psdev->pdev) {
676 DRV_NAME " device is not found/assigned\n");
680 if (!psdev->pdev->sh_info) {
681 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
682 " by HVM, kill it\n");
683 kill_domain_by_device(psdev);
687 if (!test_bit(_XEN_PCIB_AERHANDLER,
688 (unsigned long *)&psdev->pdev->sh_info->flags)) {
690 "guest with no AER driver should have been killed\n");
693 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
695 if (result == PCI_ERS_RESULT_NONE ||
696 result == PCI_ERS_RESULT_DISCONNECT) {
698 "No AER slot_reset service or disconnected!\n");
699 kill_domain_by_device(psdev);
702 pcistub_device_put(psdev);
704 up_write(&pcistub_sem);
710 /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront
711 * in case of the device driver could provide this service, and then wait
713 * @dev: pointer to PCI devices
714 * return value is used by aer_core do_recovery policy
717 static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
719 struct pcistub_device *psdev;
720 pci_ers_result_t result;
722 result = PCI_ERS_RESULT_RECOVERED;
723 dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
724 dev->bus->number, dev->devfn);
726 down_write(&pcistub_sem);
727 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
729 PCI_SLOT(dev->devfn),
730 PCI_FUNC(dev->devfn));
732 if (!psdev || !psdev->pdev) {
734 DRV_NAME " device is not found/assigned\n");
738 if (!psdev->pdev->sh_info) {
739 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
740 " by HVM, kill it\n");
741 kill_domain_by_device(psdev);
745 if (!test_bit(_XEN_PCIB_AERHANDLER,
746 (unsigned long *)&psdev->pdev->sh_info->flags)) {
748 "guest with no AER driver should have been killed\n");
751 result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
753 if (result == PCI_ERS_RESULT_NONE ||
754 result == PCI_ERS_RESULT_DISCONNECT) {
756 "No AER mmio_enabled service or disconnected!\n");
757 kill_domain_by_device(psdev);
760 pcistub_device_put(psdev);
762 up_write(&pcistub_sem);
766 /*xen_pcibk_error_detected: it will send the error_detected request to pcifront
767 * in case of the device driver could provide this service, and then wait
769 * @dev: pointer to PCI devices
770 * @error: the current PCI connection state
771 * return value is used by aer_core do_recovery policy
774 static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev,
775 pci_channel_state_t error)
777 struct pcistub_device *psdev;
778 pci_ers_result_t result;
780 result = PCI_ERS_RESULT_CAN_RECOVER;
781 dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n",
782 dev->bus->number, dev->devfn);
784 down_write(&pcistub_sem);
785 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
787 PCI_SLOT(dev->devfn),
788 PCI_FUNC(dev->devfn));
790 if (!psdev || !psdev->pdev) {
792 DRV_NAME " device is not found/assigned\n");
796 if (!psdev->pdev->sh_info) {
797 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
798 " by HVM, kill it\n");
799 kill_domain_by_device(psdev);
803 /*Guest owns the device yet no aer handler regiested, kill guest*/
804 if (!test_bit(_XEN_PCIB_AERHANDLER,
805 (unsigned long *)&psdev->pdev->sh_info->flags)) {
806 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
807 kill_domain_by_device(psdev);
810 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
812 if (result == PCI_ERS_RESULT_NONE ||
813 result == PCI_ERS_RESULT_DISCONNECT) {
815 "No AER error_detected service or disconnected!\n");
816 kill_domain_by_device(psdev);
819 pcistub_device_put(psdev);
821 up_write(&pcistub_sem);
825 /*xen_pcibk_error_resume: it will send the error_resume request to pcifront
826 * in case of the device driver could provide this service, and then wait
828 * @dev: pointer to PCI devices
831 static void xen_pcibk_error_resume(struct pci_dev *dev)
833 struct pcistub_device *psdev;
835 dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
836 dev->bus->number, dev->devfn);
838 down_write(&pcistub_sem);
839 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
841 PCI_SLOT(dev->devfn),
842 PCI_FUNC(dev->devfn));
844 if (!psdev || !psdev->pdev) {
846 DRV_NAME " device is not found/assigned\n");
850 if (!psdev->pdev->sh_info) {
851 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
852 " by HVM, kill it\n");
853 kill_domain_by_device(psdev);
857 if (!test_bit(_XEN_PCIB_AERHANDLER,
858 (unsigned long *)&psdev->pdev->sh_info->flags)) {
860 "guest with no AER driver should have been killed\n");
861 kill_domain_by_device(psdev);
864 common_process(psdev, 1, XEN_PCI_OP_aer_resume,
865 PCI_ERS_RESULT_RECOVERED);
867 pcistub_device_put(psdev);
869 up_write(&pcistub_sem);
873 /*add xen_pcibk AER handling*/
874 static struct pci_error_handlers xen_pcibk_error_handler = {
875 .error_detected = xen_pcibk_error_detected,
876 .mmio_enabled = xen_pcibk_mmio_enabled,
877 .slot_reset = xen_pcibk_slot_reset,
878 .resume = xen_pcibk_error_resume,
882 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
883 * for a normal device. I don't want it to be loaded automatically.
886 static struct pci_driver xen_pcibk_pci_driver = {
887 /* The name should be xen_pciback, but until the tools are updated
888 * we will keep it as pciback. */
890 .id_table = pcistub_ids,
891 .probe = pcistub_probe,
892 .remove = pcistub_remove,
893 .err_handler = &xen_pcibk_error_handler,
896 static inline int str_to_slot(const char *buf, int *domain, int *bus,
897 int *slot, int *func)
901 err = sscanf(buf, " %x:%x:%x.%x", domain, bus, slot, func);
907 /* try again without domain */
909 err = sscanf(buf, " %x:%x.%x", bus, slot, func);
916 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
917 *slot, int *func, int *reg, int *size, int *mask)
922 sscanf(buf, " %04x:%02x:%02x.%d-%08x:%1x:%08x", domain, bus, slot,
923 func, reg, size, mask);
929 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
931 struct pcistub_device_id *pci_dev_id;
934 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
938 pci_dev_id->domain = domain;
939 pci_dev_id->bus = bus;
940 pci_dev_id->devfn = PCI_DEVFN(slot, func);
942 pr_debug(DRV_NAME ": wants to seize %04x:%02x:%02x.%d\n",
943 domain, bus, slot, func);
945 spin_lock_irqsave(&device_ids_lock, flags);
946 list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids);
947 spin_unlock_irqrestore(&device_ids_lock, flags);
952 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
954 struct pcistub_device_id *pci_dev_id, *t;
955 int devfn = PCI_DEVFN(slot, func);
959 spin_lock_irqsave(&device_ids_lock, flags);
960 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
962 if (pci_dev_id->domain == domain
963 && pci_dev_id->bus == bus && pci_dev_id->devfn == devfn) {
964 /* Don't break; here because it's possible the same
965 * slot could be in the list more than once
967 list_del(&pci_dev_id->slot_list);
972 pr_debug(DRV_NAME ": removed %04x:%02x:%02x.%d from "
973 "seize list\n", domain, bus, slot, func);
976 spin_unlock_irqrestore(&device_ids_lock, flags);
981 static int pcistub_reg_add(int domain, int bus, int slot, int func, int reg,
985 struct pcistub_device *psdev;
987 struct config_field *field;
989 psdev = pcistub_device_find(domain, bus, slot, func);
990 if (!psdev || !psdev->dev) {
996 field = kzalloc(sizeof(*field), GFP_ATOMIC);
1002 field->offset = reg;
1006 field->reset = NULL;
1007 field->release = NULL;
1008 field->clean = xen_pcibk_config_field_free;
1010 err = xen_pcibk_config_quirks_add_field(dev, field);
1017 static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
1020 int domain, bus, slot, func;
1023 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1027 err = pcistub_device_id_add(domain, bus, slot, func);
1034 static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
1036 static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
1039 int domain, bus, slot, func;
1042 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1046 err = pcistub_device_id_remove(domain, bus, slot, func);
1053 static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
1055 static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
1057 struct pcistub_device_id *pci_dev_id;
1059 unsigned long flags;
1061 spin_lock_irqsave(&device_ids_lock, flags);
1062 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1063 if (count >= PAGE_SIZE)
1066 count += scnprintf(buf + count, PAGE_SIZE - count,
1067 "%04x:%02x:%02x.%d\n",
1068 pci_dev_id->domain, pci_dev_id->bus,
1069 PCI_SLOT(pci_dev_id->devfn),
1070 PCI_FUNC(pci_dev_id->devfn));
1072 spin_unlock_irqrestore(&device_ids_lock, flags);
1076 static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
1078 static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
1080 struct pcistub_device *psdev;
1081 struct xen_pcibk_dev_data *dev_data;
1083 unsigned long flags;
1085 spin_lock_irqsave(&pcistub_devices_lock, flags);
1086 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1087 if (count >= PAGE_SIZE)
1091 dev_data = pci_get_drvdata(psdev->dev);
1095 scnprintf(buf + count, PAGE_SIZE - count,
1096 "%s:%s:%sing:%ld\n",
1097 pci_name(psdev->dev),
1098 dev_data->isr_on ? "on" : "off",
1099 dev_data->ack_intr ? "ack" : "not ack",
1102 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1105 static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
1107 static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
1111 struct pcistub_device *psdev;
1112 struct xen_pcibk_dev_data *dev_data;
1113 int domain, bus, slot, func;
1116 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1120 psdev = pcistub_device_find(domain, bus, slot, func);
1125 dev_data = pci_get_drvdata(psdev->dev);
1129 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
1130 dev_data->irq_name, dev_data->isr_on,
1133 dev_data->isr_on = !(dev_data->isr_on);
1134 if (dev_data->isr_on)
1135 dev_data->ack_intr = 1;
1141 static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL,
1142 pcistub_irq_handler_switch);
1144 static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
1147 int domain, bus, slot, func, reg, size, mask;
1150 err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size,
1155 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1163 static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
1166 unsigned long flags;
1167 struct xen_pcibk_config_quirk *quirk;
1168 struct xen_pcibk_dev_data *dev_data;
1169 const struct config_field *field;
1170 const struct config_field_entry *cfg_entry;
1172 spin_lock_irqsave(&device_ids_lock, flags);
1173 list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
1174 if (count >= PAGE_SIZE)
1177 count += scnprintf(buf + count, PAGE_SIZE - count,
1178 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1179 quirk->pdev->bus->number,
1180 PCI_SLOT(quirk->pdev->devfn),
1181 PCI_FUNC(quirk->pdev->devfn),
1182 quirk->devid.vendor, quirk->devid.device,
1183 quirk->devid.subvendor,
1184 quirk->devid.subdevice);
1186 dev_data = pci_get_drvdata(quirk->pdev);
1188 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1189 field = cfg_entry->field;
1190 if (count >= PAGE_SIZE)
1193 count += scnprintf(buf + count, PAGE_SIZE - count,
1194 "\t\t%08x:%01x:%08x\n",
1195 cfg_entry->base_offset +
1196 field->offset, field->size,
1202 spin_unlock_irqrestore(&device_ids_lock, flags);
1206 static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show,
1209 static ssize_t permissive_add(struct device_driver *drv, const char *buf,
1212 int domain, bus, slot, func;
1214 struct pcistub_device *psdev;
1215 struct xen_pcibk_dev_data *dev_data;
1216 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1219 psdev = pcistub_device_find(domain, bus, slot, func);
1228 dev_data = pci_get_drvdata(psdev->dev);
1229 /* the driver data for a device should never be null at this point */
1234 if (!dev_data->permissive) {
1235 dev_data->permissive = 1;
1236 /* Let user know that what they're doing could be unsafe */
1237 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1238 "configuration space accesses!\n");
1239 dev_warn(&psdev->dev->dev,
1240 "permissive mode is potentially unsafe!\n");
1243 pcistub_device_put(psdev);
1250 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1252 struct pcistub_device *psdev;
1253 struct xen_pcibk_dev_data *dev_data;
1255 unsigned long flags;
1256 spin_lock_irqsave(&pcistub_devices_lock, flags);
1257 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1258 if (count >= PAGE_SIZE)
1262 dev_data = pci_get_drvdata(psdev->dev);
1263 if (!dev_data || !dev_data->permissive)
1266 scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1267 pci_name(psdev->dev));
1269 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1272 static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show,
1275 static void pcistub_exit(void)
1277 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
1278 driver_remove_file(&xen_pcibk_pci_driver.driver,
1279 &driver_attr_remove_slot);
1280 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
1281 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
1282 driver_remove_file(&xen_pcibk_pci_driver.driver,
1283 &driver_attr_permissive);
1284 driver_remove_file(&xen_pcibk_pci_driver.driver,
1285 &driver_attr_irq_handlers);
1286 driver_remove_file(&xen_pcibk_pci_driver.driver,
1287 &driver_attr_irq_handler_state);
1288 pci_unregister_driver(&xen_pcibk_pci_driver);
1291 static int __init pcistub_init(void)
1295 int domain, bus, slot, func;
1298 if (pci_devs_to_hide && *pci_devs_to_hide) {
1302 err = sscanf(pci_devs_to_hide + pos,
1303 " (%x:%x:%x.%x) %n",
1304 &domain, &bus, &slot, &func, &parsed);
1307 err = sscanf(pci_devs_to_hide + pos,
1309 &bus, &slot, &func, &parsed);
1314 err = pcistub_device_id_add(domain, bus, slot, func);
1318 /* if parsed<=0, we've reached the end of the string */
1320 } while (parsed > 0 && pci_devs_to_hide[pos]);
1323 /* If we're the first PCI Device Driver to register, we're the
1324 * first one to get offered PCI devices as they become
1325 * available (and thus we can be the first to grab them)
1327 err = pci_register_driver(&xen_pcibk_pci_driver);
1331 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1332 &driver_attr_new_slot);
1334 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1335 &driver_attr_remove_slot);
1337 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1338 &driver_attr_slots);
1340 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1341 &driver_attr_quirks);
1343 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1344 &driver_attr_permissive);
1347 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1348 &driver_attr_irq_handlers);
1350 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1351 &driver_attr_irq_handler_state);
1359 printk(KERN_ERR DRV_NAME ": Error parsing pci_devs_to_hide at \"%s\"\n",
1360 pci_devs_to_hide + pos);
1366 * fs_initcall happens before device_initcall
1367 * so xen_pcibk *should* get called first (b/c we
1368 * want to suck up any device before other drivers
1369 * get a chance by being the first pci device
1370 * driver to register)
1372 fs_initcall(pcistub_init);
1375 static int __init xen_pcibk_init(void)
1379 if (!xen_initial_domain())
1382 err = xen_pcibk_config_init();
1387 err = pcistub_init();
1392 pcistub_init_devices_late();
1393 err = xen_pcibk_xenbus_register();
1400 static void __exit xen_pcibk_cleanup(void)
1402 xen_pcibk_xenbus_unregister();
1406 module_init(xen_pcibk_init);
1407 module_exit(xen_pcibk_cleanup);
1409 MODULE_LICENSE("Dual BSD/GPL");
1410 MODULE_ALIAS("xen-backend:pci");