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 #define DRV_NAME "pciback"
26 static char *pci_devs_to_hide;
27 wait_queue_head_t aer_wait_queue;
28 /*Add sem for sync AER handling and pciback remove/reconfigue ops,
29 * We want to avoid in middle of AER ops, pciback devices is being removed
31 static DECLARE_RWSEM(pcistub_sem);
32 module_param_named(hide, pci_devs_to_hide, charp, 0444);
34 struct pcistub_device_id {
35 struct list_head slot_list;
40 static LIST_HEAD(pcistub_device_ids);
41 static DEFINE_SPINLOCK(device_ids_lock);
43 struct pcistub_device {
45 struct list_head dev_list;
49 struct pciback_device *pdev;/* non-NULL if struct pci_dev is in use */
52 /* Access to pcistub_devices & seized_devices lists and the initialize_devices
53 * flag must be locked with pcistub_devices_lock
55 static DEFINE_SPINLOCK(pcistub_devices_lock);
56 static LIST_HEAD(pcistub_devices);
58 /* wait for device_initcall before initializing our devices
59 * (see pcistub_init_devices_late)
61 static int initialize_devices;
62 static LIST_HEAD(seized_devices);
64 static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
66 struct pcistub_device *psdev;
68 dev_dbg(&dev->dev, "pcistub_device_alloc\n");
70 psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC);
74 psdev->dev = pci_dev_get(dev);
80 kref_init(&psdev->kref);
81 spin_lock_init(&psdev->lock);
86 /* Don't call this directly as it's called by pcistub_device_put */
87 static void pcistub_device_release(struct kref *kref)
89 struct pcistub_device *psdev;
91 psdev = container_of(kref, struct pcistub_device, kref);
93 dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
95 xen_unregister_device_domain_owner(psdev->dev);
97 /* Clean-up the device */
98 pciback_reset_device(psdev->dev);
99 pciback_config_free_dyn_fields(psdev->dev);
100 pciback_config_free_dev(psdev->dev);
101 kfree(pci_get_drvdata(psdev->dev));
102 pci_set_drvdata(psdev->dev, NULL);
104 pci_dev_put(psdev->dev);
109 static inline void pcistub_device_get(struct pcistub_device *psdev)
111 kref_get(&psdev->kref);
114 static inline void pcistub_device_put(struct pcistub_device *psdev)
116 kref_put(&psdev->kref, pcistub_device_release);
119 static struct pcistub_device *pcistub_device_find(int domain, int bus,
122 struct pcistub_device *psdev = NULL;
125 spin_lock_irqsave(&pcistub_devices_lock, flags);
127 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
128 if (psdev->dev != NULL
129 && domain == pci_domain_nr(psdev->dev->bus)
130 && bus == psdev->dev->bus->number
131 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
132 pcistub_device_get(psdev);
141 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
145 static struct pci_dev *pcistub_device_get_pci_dev(struct pciback_device *pdev,
146 struct pcistub_device *psdev)
148 struct pci_dev *pci_dev = NULL;
151 pcistub_device_get(psdev);
153 spin_lock_irqsave(&psdev->lock, flags);
156 pci_dev = psdev->dev;
158 spin_unlock_irqrestore(&psdev->lock, flags);
161 pcistub_device_put(psdev);
166 struct pci_dev *pcistub_get_pci_dev_by_slot(struct pciback_device *pdev,
170 struct pcistub_device *psdev;
171 struct pci_dev *found_dev = NULL;
174 spin_lock_irqsave(&pcistub_devices_lock, flags);
176 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
177 if (psdev->dev != NULL
178 && domain == pci_domain_nr(psdev->dev->bus)
179 && bus == psdev->dev->bus->number
180 && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
181 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
186 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
190 struct pci_dev *pcistub_get_pci_dev(struct pciback_device *pdev,
193 struct pcistub_device *psdev;
194 struct pci_dev *found_dev = NULL;
197 spin_lock_irqsave(&pcistub_devices_lock, flags);
199 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
200 if (psdev->dev == dev) {
201 found_dev = pcistub_device_get_pci_dev(pdev, psdev);
206 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
210 void pcistub_put_pci_dev(struct pci_dev *dev)
212 struct pcistub_device *psdev, *found_psdev = NULL;
215 spin_lock_irqsave(&pcistub_devices_lock, flags);
217 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
218 if (psdev->dev == dev) {
224 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
226 /*hold this lock for avoiding breaking link between
227 * pcistub and pciback when AER is in processing
229 down_write(&pcistub_sem);
230 /* Cleanup our device
231 * (so it's ready for the next domain)
233 pciback_reset_device(found_psdev->dev);
234 pciback_config_free_dyn_fields(found_psdev->dev);
235 pciback_config_reset_dev(found_psdev->dev);
237 spin_lock_irqsave(&found_psdev->lock, flags);
238 found_psdev->pdev = NULL;
239 spin_unlock_irqrestore(&found_psdev->lock, flags);
241 pcistub_device_put(found_psdev);
242 up_write(&pcistub_sem);
245 static int __devinit pcistub_match_one(struct pci_dev *dev,
246 struct pcistub_device_id *pdev_id)
248 /* Match the specified device by domain, bus, slot, func and also if
249 * any of the device's parent bridges match.
251 for (; dev != NULL; dev = dev->bus->self) {
252 if (pci_domain_nr(dev->bus) == pdev_id->domain
253 && dev->bus->number == pdev_id->bus
254 && dev->devfn == pdev_id->devfn)
257 /* Sometimes topmost bridge links to itself. */
258 if (dev == dev->bus->self)
265 static int __devinit pcistub_match(struct pci_dev *dev)
267 struct pcistub_device_id *pdev_id;
271 spin_lock_irqsave(&device_ids_lock, flags);
272 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
273 if (pcistub_match_one(dev, pdev_id)) {
278 spin_unlock_irqrestore(&device_ids_lock, flags);
283 static int __devinit pcistub_init_device(struct pci_dev *dev)
285 struct pciback_dev_data *dev_data;
288 dev_dbg(&dev->dev, "initializing...\n");
290 /* The PCI backend is not intended to be a module (or to work with
291 * removable PCI devices (yet). If it were, pciback_config_free()
292 * would need to be called somewhere to free the memory allocated
293 * here and then to call kfree(pci_get_drvdata(psdev->dev)).
295 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
296 + strlen(pci_name(dev)) + 1, GFP_ATOMIC);
301 pci_set_drvdata(dev, dev_data);
304 * Setup name for fake IRQ handler. It will only be enabled
305 * once the device is turned on by the guest.
307 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
309 dev_dbg(&dev->dev, "initializing config\n");
311 init_waitqueue_head(&aer_wait_queue);
312 err = pciback_config_init_dev(dev);
316 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we
317 * must do this here because pcibios_enable_device may specify
318 * the pci device's true irq (and possibly its other resources)
319 * if they differ from what's in the configuration space.
320 * This makes the assumption that the device's resources won't
321 * change after this point (otherwise this code may break!)
323 dev_dbg(&dev->dev, "enabling device\n");
324 err = pci_enable_device(dev);
328 /* Now disable the device (this also ensures some private device
329 * data is setup before we export)
331 dev_dbg(&dev->dev, "reset device\n");
332 pciback_reset_device(dev);
337 pciback_config_free_dev(dev);
340 pci_set_drvdata(dev, NULL);
346 * Because some initialization still happens on
347 * devices during fs_initcall, we need to defer
348 * full initialization of our devices until
351 static int __init pcistub_init_devices_late(void)
353 struct pcistub_device *psdev;
357 pr_debug("pciback: pcistub_init_devices_late\n");
359 spin_lock_irqsave(&pcistub_devices_lock, flags);
361 while (!list_empty(&seized_devices)) {
362 psdev = container_of(seized_devices.next,
363 struct pcistub_device, dev_list);
364 list_del(&psdev->dev_list);
366 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
368 err = pcistub_init_device(psdev->dev);
370 dev_err(&psdev->dev->dev,
371 "error %d initializing device\n", err);
376 spin_lock_irqsave(&pcistub_devices_lock, flags);
379 list_add_tail(&psdev->dev_list, &pcistub_devices);
382 initialize_devices = 1;
384 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
389 static int __devinit pcistub_seize(struct pci_dev *dev)
391 struct pcistub_device *psdev;
395 psdev = pcistub_device_alloc(dev);
399 spin_lock_irqsave(&pcistub_devices_lock, flags);
401 if (initialize_devices) {
402 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
404 /* don't want irqs disabled when calling pcistub_init_device */
405 err = pcistub_init_device(psdev->dev);
407 spin_lock_irqsave(&pcistub_devices_lock, flags);
410 list_add(&psdev->dev_list, &pcistub_devices);
412 dev_dbg(&dev->dev, "deferring initialization\n");
413 list_add(&psdev->dev_list, &seized_devices);
416 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
419 pcistub_device_put(psdev);
424 static int __devinit pcistub_probe(struct pci_dev *dev,
425 const struct pci_device_id *id)
429 dev_dbg(&dev->dev, "probing...\n");
431 if (pcistub_match(dev)) {
433 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
434 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
435 dev_err(&dev->dev, "can't export pci devices that "
436 "don't have a normal (0) or bridge (1) "
442 dev_info(&dev->dev, "seizing device\n");
443 err = pcistub_seize(dev);
445 /* Didn't find the device */
452 static void pcistub_remove(struct pci_dev *dev)
454 struct pcistub_device *psdev, *found_psdev = NULL;
457 dev_dbg(&dev->dev, "removing\n");
459 spin_lock_irqsave(&pcistub_devices_lock, flags);
461 pciback_config_quirk_release(dev);
463 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
464 if (psdev->dev == dev) {
470 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
473 dev_dbg(&dev->dev, "found device to remove - in use? %p\n",
476 if (found_psdev->pdev) {
477 printk(KERN_WARNING "pciback: ****** removing device "
478 "%s while still in-use! ******\n",
479 pci_name(found_psdev->dev));
480 printk(KERN_WARNING "pciback: ****** driver domain may "
481 "still access this device's i/o resources!\n");
482 printk(KERN_WARNING "pciback: ****** shutdown driver "
483 "domain before binding device\n");
484 printk(KERN_WARNING "pciback: ****** to other drivers "
487 pciback_release_pci_dev(found_psdev->pdev,
491 spin_lock_irqsave(&pcistub_devices_lock, flags);
492 list_del(&found_psdev->dev_list);
493 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
495 /* the final put for releasing from the list */
496 pcistub_device_put(found_psdev);
500 static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = {
502 .vendor = PCI_ANY_ID,
503 .device = PCI_ANY_ID,
504 .subvendor = PCI_ANY_ID,
505 .subdevice = PCI_ANY_ID,
510 #define PCI_NODENAME_MAX 40
511 static void kill_domain_by_device(struct pcistub_device *psdev)
513 struct xenbus_transaction xbt;
515 char nodename[PCI_NODENAME_MAX];
518 dev_err(&psdev->dev->dev,
519 "device is NULL when do AER recovery/kill_domain\n");
520 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
521 psdev->pdev->xdev->otherend_id);
522 nodename[strlen(nodename)] = '\0';
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 pciback, 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, pci_ers_result_t result)
550 pci_ers_result_t res = result;
551 struct xen_pcie_aer_op *aer_op;
554 /*with PV AER drivers*/
555 aer_op = &(psdev->pdev->sh_info->aer_op);
556 aer_op->cmd = aer_cmd ;
557 /*useful for error_detected callback*/
560 ret = pciback_get_pcifront_dev(psdev->dev, psdev->pdev,
561 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
563 dev_err(&psdev->dev->dev,
564 "pciback: failed to get pcifront device\n");
565 return PCI_ERS_RESULT_NONE;
569 dev_dbg(&psdev->dev->dev,
570 "pciback: aer_op %x dom %x bus %x devfn %x\n",
571 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
572 /*local flag to mark there's aer request, pciback callback will use this
573 * flag to judge whether we need to check pci-front give aer service
576 set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
578 /*It is possible that a pcifront conf_read_write ops request invokes
579 * the callback which cause the spurious execution of wake_up.
580 * Yet it is harmless and better than a spinlock here
582 set_bit(_XEN_PCIB_active,
583 (unsigned long *)&psdev->pdev->sh_info->flags);
585 notify_remote_via_irq(psdev->pdev->evtchn_irq);
587 ret = wait_event_timeout(aer_wait_queue, !(test_bit(_XEN_PCIB_active,
588 (unsigned long *)&psdev->pdev->sh_info->flags)), 300*HZ);
591 if (test_bit(_XEN_PCIB_active,
592 (unsigned long *)&psdev->pdev->sh_info->flags)) {
593 dev_err(&psdev->dev->dev,
594 "pcifront aer process not responding!\n");
595 clear_bit(_XEN_PCIB_active,
596 (unsigned long *)&psdev->pdev->sh_info->flags);
597 aer_op->err = PCI_ERS_RESULT_NONE;
601 clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
603 if (test_bit(_XEN_PCIF_active,
604 (unsigned long *)&psdev->pdev->sh_info->flags)) {
605 dev_dbg(&psdev->dev->dev,
606 "schedule pci_conf service in pciback\n");
607 test_and_schedule_op(psdev->pdev);
610 res = (pci_ers_result_t)aer_op->err;
615 * pciback_slot_reset: it will send the slot_reset request to pcifront in case
616 * of the device driver could provide this service, and then wait for pcifront
618 * @dev: pointer to PCI devices
619 * return value is used by aer_core do_recovery policy
621 static pci_ers_result_t pciback_slot_reset(struct pci_dev *dev)
623 struct pcistub_device *psdev;
624 pci_ers_result_t result;
626 result = PCI_ERS_RESULT_RECOVERED;
627 dev_dbg(&dev->dev, "pciback_slot_reset(bus:%x,devfn:%x)\n",
628 dev->bus->number, dev->devfn);
630 down_write(&pcistub_sem);
631 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
633 PCI_SLOT(dev->devfn),
634 PCI_FUNC(dev->devfn));
636 if (!psdev || !psdev->pdev) {
638 "pciback device is not found/assigned\n");
642 if (!psdev->pdev->sh_info) {
643 dev_err(&dev->dev, "pciback device is not connected or owned"
644 " by HVM, kill it\n");
645 kill_domain_by_device(psdev);
649 if (!test_bit(_XEN_PCIB_AERHANDLER,
650 (unsigned long *)&psdev->pdev->sh_info->flags)) {
652 "guest with no AER driver should have been killed\n");
655 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
657 if (result == PCI_ERS_RESULT_NONE ||
658 result == PCI_ERS_RESULT_DISCONNECT) {
660 "No AER slot_reset service or disconnected!\n");
661 kill_domain_by_device(psdev);
664 pcistub_device_put(psdev);
666 up_write(&pcistub_sem);
672 /*pciback_mmio_enabled: it will send the mmio_enabled request to pcifront
673 * in case of the device driver could provide this service, and then wait
675 * @dev: pointer to PCI devices
676 * return value is used by aer_core do_recovery policy
679 static pci_ers_result_t pciback_mmio_enabled(struct pci_dev *dev)
681 struct pcistub_device *psdev;
682 pci_ers_result_t result;
684 result = PCI_ERS_RESULT_RECOVERED;
685 dev_dbg(&dev->dev, "pciback_mmio_enabled(bus:%x,devfn:%x)\n",
686 dev->bus->number, dev->devfn);
688 down_write(&pcistub_sem);
689 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
691 PCI_SLOT(dev->devfn),
692 PCI_FUNC(dev->devfn));
694 if (!psdev || !psdev->pdev) {
696 "pciback device is not found/assigned\n");
700 if (!psdev->pdev->sh_info) {
701 dev_err(&dev->dev, "pciback device is not connected or owned"
702 " by HVM, kill it\n");
703 kill_domain_by_device(psdev);
707 if (!test_bit(_XEN_PCIB_AERHANDLER,
708 (unsigned long *)&psdev->pdev->sh_info->flags)) {
710 "guest with no AER driver should have been killed\n");
713 result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
715 if (result == PCI_ERS_RESULT_NONE ||
716 result == PCI_ERS_RESULT_DISCONNECT) {
718 "No AER mmio_enabled service or disconnected!\n");
719 kill_domain_by_device(psdev);
722 pcistub_device_put(psdev);
724 up_write(&pcistub_sem);
728 /*pciback_error_detected: it will send the error_detected request to pcifront
729 * in case of the device driver could provide this service, and then wait
731 * @dev: pointer to PCI devices
732 * @error: the current PCI connection state
733 * return value is used by aer_core do_recovery policy
736 static pci_ers_result_t pciback_error_detected(struct pci_dev *dev,
737 pci_channel_state_t error)
739 struct pcistub_device *psdev;
740 pci_ers_result_t result;
742 result = PCI_ERS_RESULT_CAN_RECOVER;
743 dev_dbg(&dev->dev, "pciback_error_detected(bus:%x,devfn:%x)\n",
744 dev->bus->number, dev->devfn);
746 down_write(&pcistub_sem);
747 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
749 PCI_SLOT(dev->devfn),
750 PCI_FUNC(dev->devfn));
752 if (!psdev || !psdev->pdev) {
754 "pciback device is not found/assigned\n");
758 if (!psdev->pdev->sh_info) {
759 dev_err(&dev->dev, "pciback device is not connected or owned"
760 " by HVM, kill it\n");
761 kill_domain_by_device(psdev);
765 /*Guest owns the device yet no aer handler regiested, kill guest*/
766 if (!test_bit(_XEN_PCIB_AERHANDLER,
767 (unsigned long *)&psdev->pdev->sh_info->flags)) {
768 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
769 kill_domain_by_device(psdev);
772 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
774 if (result == PCI_ERS_RESULT_NONE ||
775 result == PCI_ERS_RESULT_DISCONNECT) {
777 "No AER error_detected service or disconnected!\n");
778 kill_domain_by_device(psdev);
781 pcistub_device_put(psdev);
783 up_write(&pcistub_sem);
787 /*pciback_error_resume: it will send the error_resume request to pcifront
788 * in case of the device driver could provide this service, and then wait
790 * @dev: pointer to PCI devices
793 static void pciback_error_resume(struct pci_dev *dev)
795 struct pcistub_device *psdev;
797 dev_dbg(&dev->dev, "pciback_error_resume(bus:%x,devfn:%x)\n",
798 dev->bus->number, dev->devfn);
800 down_write(&pcistub_sem);
801 psdev = pcistub_device_find(pci_domain_nr(dev->bus),
803 PCI_SLOT(dev->devfn),
804 PCI_FUNC(dev->devfn));
806 if (!psdev || !psdev->pdev) {
808 "pciback device is not found/assigned\n");
812 if (!psdev->pdev->sh_info) {
813 dev_err(&dev->dev, "pciback device is not connected or owned"
814 " by HVM, kill it\n");
815 kill_domain_by_device(psdev);
819 if (!test_bit(_XEN_PCIB_AERHANDLER,
820 (unsigned long *)&psdev->pdev->sh_info->flags)) {
822 "guest with no AER driver should have been killed\n");
823 kill_domain_by_device(psdev);
826 common_process(psdev, 1, XEN_PCI_OP_aer_resume,
827 PCI_ERS_RESULT_RECOVERED);
829 pcistub_device_put(psdev);
831 up_write(&pcistub_sem);
835 /*add pciback AER handling*/
836 static struct pci_error_handlers pciback_error_handler = {
837 .error_detected = pciback_error_detected,
838 .mmio_enabled = pciback_mmio_enabled,
839 .slot_reset = pciback_slot_reset,
840 .resume = pciback_error_resume,
844 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
845 * for a normal device. I don't want it to be loaded automatically.
848 static struct pci_driver pciback_pci_driver = {
850 .id_table = pcistub_ids,
851 .probe = pcistub_probe,
852 .remove = pcistub_remove,
853 .err_handler = &pciback_error_handler,
856 static inline int str_to_slot(const char *buf, int *domain, int *bus,
857 int *slot, int *func)
861 err = sscanf(buf, " %x:%x:%x.%x", domain, bus, slot, func);
867 /* try again without domain */
869 err = sscanf(buf, " %x:%x.%x", bus, slot, func);
876 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
877 *slot, int *func, int *reg, int *size, int *mask)
882 sscanf(buf, " %04x:%02x:%02x.%1x-%08x:%1x:%08x", domain, bus, slot,
883 func, reg, size, mask);
889 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
891 struct pcistub_device_id *pci_dev_id;
894 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
898 pci_dev_id->domain = domain;
899 pci_dev_id->bus = bus;
900 pci_dev_id->devfn = PCI_DEVFN(slot, func);
902 pr_debug("pciback: wants to seize %04x:%02x:%02x.%01x\n",
903 domain, bus, slot, func);
905 spin_lock_irqsave(&device_ids_lock, flags);
906 list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids);
907 spin_unlock_irqrestore(&device_ids_lock, flags);
912 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
914 struct pcistub_device_id *pci_dev_id, *t;
915 int devfn = PCI_DEVFN(slot, func);
919 spin_lock_irqsave(&device_ids_lock, flags);
920 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
922 if (pci_dev_id->domain == domain
923 && pci_dev_id->bus == bus && pci_dev_id->devfn == devfn) {
924 /* Don't break; here because it's possible the same
925 * slot could be in the list more than once
927 list_del(&pci_dev_id->slot_list);
932 pr_debug("pciback: removed %04x:%02x:%02x.%01x from "
933 "seize list\n", domain, bus, slot, func);
936 spin_unlock_irqrestore(&device_ids_lock, flags);
941 static int pcistub_reg_add(int domain, int bus, int slot, int func, int reg,
945 struct pcistub_device *psdev;
947 struct config_field *field;
949 psdev = pcistub_device_find(domain, bus, slot, func);
950 if (!psdev || !psdev->dev) {
956 field = kzalloc(sizeof(*field), GFP_ATOMIC);
967 field->release = NULL;
968 field->clean = pciback_config_field_free;
970 err = pciback_config_quirks_add_field(dev, field);
977 static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
980 int domain, bus, slot, func;
983 err = str_to_slot(buf, &domain, &bus, &slot, &func);
987 err = pcistub_device_id_add(domain, bus, slot, func);
995 DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
997 static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
1000 int domain, bus, slot, func;
1003 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1007 err = pcistub_device_id_remove(domain, bus, slot, func);
1015 DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
1017 static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
1019 struct pcistub_device_id *pci_dev_id;
1021 unsigned long flags;
1023 spin_lock_irqsave(&device_ids_lock, flags);
1024 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1025 if (count >= PAGE_SIZE)
1028 count += scnprintf(buf + count, PAGE_SIZE - count,
1029 "%04x:%02x:%02x.%01x\n",
1030 pci_dev_id->domain, pci_dev_id->bus,
1031 PCI_SLOT(pci_dev_id->devfn),
1032 PCI_FUNC(pci_dev_id->devfn));
1034 spin_unlock_irqrestore(&device_ids_lock, flags);
1039 DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
1041 static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
1043 struct pcistub_device *psdev;
1044 struct pciback_dev_data *dev_data;
1046 unsigned long flags;
1048 spin_lock_irqsave(&pcistub_devices_lock, flags);
1049 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1050 if (count >= PAGE_SIZE)
1054 dev_data = pci_get_drvdata(psdev->dev);
1058 scnprintf(buf + count, PAGE_SIZE - count,
1059 "%s:%s:%sing:%ld\n",
1060 pci_name(psdev->dev),
1061 dev_data->isr_on ? "on" : "off",
1062 dev_data->ack_intr ? "ack" : "not ack",
1065 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1069 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 pciback_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 DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL, pcistub_irq_handler_switch);
1107 static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
1110 int domain, bus, slot, func, reg, size, mask;
1113 err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size,
1118 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1126 static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
1129 unsigned long flags;
1130 struct pciback_config_quirk *quirk;
1131 struct pciback_dev_data *dev_data;
1132 const struct config_field *field;
1133 const struct config_field_entry *cfg_entry;
1135 spin_lock_irqsave(&device_ids_lock, flags);
1136 list_for_each_entry(quirk, &pciback_quirks, quirks_list) {
1137 if (count >= PAGE_SIZE)
1140 count += scnprintf(buf + count, PAGE_SIZE - count,
1141 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1142 quirk->pdev->bus->number,
1143 PCI_SLOT(quirk->pdev->devfn),
1144 PCI_FUNC(quirk->pdev->devfn),
1145 quirk->devid.vendor, quirk->devid.device,
1146 quirk->devid.subvendor,
1147 quirk->devid.subdevice);
1149 dev_data = pci_get_drvdata(quirk->pdev);
1151 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1152 field = cfg_entry->field;
1153 if (count >= PAGE_SIZE)
1156 count += scnprintf(buf + count, PAGE_SIZE - count,
1157 "\t\t%08x:%01x:%08x\n",
1158 cfg_entry->base_offset +
1159 field->offset, field->size,
1165 spin_unlock_irqrestore(&device_ids_lock, flags);
1170 DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show, pcistub_quirk_add);
1172 static ssize_t permissive_add(struct device_driver *drv, const char *buf,
1175 int domain, bus, slot, func;
1177 struct pcistub_device *psdev;
1178 struct pciback_dev_data *dev_data;
1179 err = str_to_slot(buf, &domain, &bus, &slot, &func);
1182 psdev = pcistub_device_find(domain, bus, slot, func);
1191 dev_data = pci_get_drvdata(psdev->dev);
1192 /* the driver data for a device should never be null at this point */
1197 if (!dev_data->permissive) {
1198 dev_data->permissive = 1;
1199 /* Let user know that what they're doing could be unsafe */
1200 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1201 "configuration space accesses!\n");
1202 dev_warn(&psdev->dev->dev,
1203 "permissive mode is potentially unsafe!\n");
1206 pcistub_device_put(psdev);
1213 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1215 struct pcistub_device *psdev;
1216 struct pciback_dev_data *dev_data;
1218 unsigned long flags;
1219 spin_lock_irqsave(&pcistub_devices_lock, flags);
1220 list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1221 if (count >= PAGE_SIZE)
1225 dev_data = pci_get_drvdata(psdev->dev);
1226 if (!dev_data || !dev_data->permissive)
1229 scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1230 pci_name(psdev->dev));
1232 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1236 DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, permissive_add);
1238 static void pcistub_exit(void)
1240 driver_remove_file(&pciback_pci_driver.driver, &driver_attr_new_slot);
1241 driver_remove_file(&pciback_pci_driver.driver,
1242 &driver_attr_remove_slot);
1243 driver_remove_file(&pciback_pci_driver.driver, &driver_attr_slots);
1244 driver_remove_file(&pciback_pci_driver.driver, &driver_attr_quirks);
1245 driver_remove_file(&pciback_pci_driver.driver, &driver_attr_permissive);
1246 driver_remove_file(&pciback_pci_driver.driver,
1247 &driver_attr_irq_handlers);
1248 driver_remove_file(&pciback_pci_driver.driver,
1249 &driver_attr_irq_handler_state);
1250 pci_unregister_driver(&pciback_pci_driver);
1253 static int __init pcistub_init(void)
1257 int domain, bus, slot, func;
1260 if (pci_devs_to_hide && *pci_devs_to_hide) {
1264 err = sscanf(pci_devs_to_hide + pos,
1265 " (%x:%x:%x.%x) %n",
1266 &domain, &bus, &slot, &func, &parsed);
1269 err = sscanf(pci_devs_to_hide + pos,
1271 &bus, &slot, &func, &parsed);
1276 err = pcistub_device_id_add(domain, bus, slot, func);
1280 /* if parsed<=0, we've reached the end of the string */
1282 } while (parsed > 0 && pci_devs_to_hide[pos]);
1285 /* If we're the first PCI Device Driver to register, we're the
1286 * first one to get offered PCI devices as they become
1287 * available (and thus we can be the first to grab them)
1289 err = pci_register_driver(&pciback_pci_driver);
1293 err = driver_create_file(&pciback_pci_driver.driver,
1294 &driver_attr_new_slot);
1296 err = driver_create_file(&pciback_pci_driver.driver,
1297 &driver_attr_remove_slot);
1299 err = driver_create_file(&pciback_pci_driver.driver,
1300 &driver_attr_slots);
1302 err = driver_create_file(&pciback_pci_driver.driver,
1303 &driver_attr_quirks);
1305 err = driver_create_file(&pciback_pci_driver.driver,
1306 &driver_attr_permissive);
1309 err = driver_create_file(&pciback_pci_driver.driver,
1310 &driver_attr_irq_handlers);
1312 err = driver_create_file(&pciback_pci_driver.driver,
1313 &driver_attr_irq_handler_state);
1321 printk(KERN_ERR "pciback: Error parsing pci_devs_to_hide at \"%s\"\n",
1322 pci_devs_to_hide + pos);
1328 * fs_initcall happens before device_initcall
1329 * so pciback *should* get called first (b/c we
1330 * want to suck up any device before other drivers
1331 * get a chance by being the first pci device
1332 * driver to register)
1334 fs_initcall(pcistub_init);
1337 static int __init pciback_init(void)
1341 if (!xen_initial_domain())
1344 err = pciback_config_init();
1349 err = pcistub_init();
1354 pcistub_init_devices_late();
1355 err = pciback_xenbus_register();
1362 static void __exit pciback_cleanup(void)
1364 pciback_xenbus_unregister();
1368 module_init(pciback_init);
1369 module_exit(pciback_cleanup);
1371 MODULE_LICENSE("Dual BSD/GPL");