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android-kvm / linux / 553217c244261039ca3350d64894c2fe1477c04e / . / drivers / xen / xen-pciback / pci_stub.c
blob: bba52762050787f7f1384207b5ee49930dba6e6a [file] [log] [blame]
/*
* PCI Stub Driver - Grabs devices in backend to be exported later
*
* Ryan Wilson <hap9@epoch.ncsc.mil>
* Chris Bookholt <hap10@epoch.ncsc.mil>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#define dev_fmt pr_fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/rwsem.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/kref.h>
#include <linux/pci.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/atomic.h>
#include <xen/events.h>
#include <xen/pci.h>
#include <xen/xen.h>
#include <asm/xen/hypervisor.h>
#include <xen/interface/physdev.h>
#include "pciback.h"
#include "conf_space.h"
#include "conf_space_quirks.h"
#define PCISTUB_DRIVER_NAME "pciback"
static char *pci_devs_to_hide;
wait_queue_head_t xen_pcibk_aer_wait_queue;
/*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
* We want to avoid in middle of AER ops, xen_pcibk devices is being removed
*/
static DECLARE_RWSEM(pcistub_sem);
module_param_named(hide, pci_devs_to_hide, charp, 0444);
struct pcistub_device_id {
struct list_head slot_list;
int domain;
unsigned char bus;
unsigned int devfn;
};
static LIST_HEAD(pcistub_device_ids);
static DEFINE_SPINLOCK(device_ids_lock);
struct pcistub_device {
struct kref kref;
struct list_head dev_list;
spinlock_t lock;
struct pci_dev *dev;
struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */
};
/* Access to pcistub_devices & seized_devices lists and the initialize_devices
* flag must be locked with pcistub_devices_lock
*/
static DEFINE_SPINLOCK(pcistub_devices_lock);
static LIST_HEAD(pcistub_devices);
/* wait for device_initcall before initializing our devices
* (see pcistub_init_devices_late)
*/
static int initialize_devices;
static LIST_HEAD(seized_devices);
static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
{
struct pcistub_device *psdev;
dev_dbg(&dev->dev, "pcistub_device_alloc\n");
psdev = kzalloc(sizeof(*psdev), GFP_KERNEL);
if (!psdev)
return NULL;
psdev->dev = pci_dev_get(dev);
if (!psdev->dev) {
kfree(psdev);
return NULL;
}
kref_init(&psdev->kref);
spin_lock_init(&psdev->lock);
return psdev;
}
/* Don't call this directly as it's called by pcistub_device_put */
static void pcistub_device_release(struct kref *kref)
{
struct pcistub_device *psdev;
struct pci_dev *dev;
struct xen_pcibk_dev_data *dev_data;
psdev = container_of(kref, struct pcistub_device, kref);
dev = psdev->dev;
dev_data = pci_get_drvdata(dev);
dev_dbg(&dev->dev, "pcistub_device_release\n");
xen_unregister_device_domain_owner(dev);
/* Call the reset function which does not take lock as this
* is called from "unbind" which takes a device_lock mutex.
*/
__pci_reset_function_locked(dev);
if (dev_data &&
pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state))
dev_info(&dev->dev, "Could not reload PCI state\n");
else
pci_restore_state(dev);
if (dev->msix_cap) {
struct physdev_pci_device ppdev = {
.seg = pci_domain_nr(dev->bus),
.bus = dev->bus->number,
.devfn = dev->devfn
};
int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix,
&ppdev);
if (err && err != -ENOSYS)
dev_warn(&dev->dev, "MSI-X release failed (%d)\n",
err);
}
/* Disable the device */
xen_pcibk_reset_device(dev);
kfree(dev_data);
pci_set_drvdata(dev, NULL);
/* Clean-up the device */
xen_pcibk_config_free_dyn_fields(dev);
xen_pcibk_config_free_dev(dev);
pci_clear_dev_assigned(dev);
pci_dev_put(dev);
kfree(psdev);
}
static inline void pcistub_device_get(struct pcistub_device *psdev)
{
kref_get(&psdev->kref);
}
static inline void pcistub_device_put(struct pcistub_device *psdev)
{
kref_put(&psdev->kref, pcistub_device_release);
}
static struct pcistub_device *pcistub_device_find_locked(int domain, int bus,
int slot, int func)
{
struct pcistub_device *psdev;
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
if (psdev->dev != NULL
&& domain == pci_domain_nr(psdev->dev->bus)
&& bus == psdev->dev->bus->number
&& slot == PCI_SLOT(psdev->dev->devfn)
&& func == PCI_FUNC(psdev->dev->devfn)) {
return psdev;
}
}
return NULL;
}
static struct pcistub_device *pcistub_device_find(int domain, int bus,
int slot, int func)
{
struct pcistub_device *psdev;
unsigned long flags;
spin_lock_irqsave(&pcistub_devices_lock, flags);
psdev = pcistub_device_find_locked(domain, bus, slot, func);
if (psdev)
pcistub_device_get(psdev);
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
return psdev;
}
static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
struct pcistub_device *psdev)
{
struct pci_dev *pci_dev = NULL;
unsigned long flags;
pcistub_device_get(psdev);
spin_lock_irqsave(&psdev->lock, flags);
if (!psdev->pdev) {
psdev->pdev = pdev;
pci_dev = psdev->dev;
}
spin_unlock_irqrestore(&psdev->lock, flags);
if (!pci_dev)
pcistub_device_put(psdev);
return pci_dev;
}
struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
int domain, int bus,
int slot, int func)
{
struct pcistub_device *psdev;
struct pci_dev *found_dev = NULL;
unsigned long flags;
spin_lock_irqsave(&pcistub_devices_lock, flags);
psdev = pcistub_device_find_locked(domain, bus, slot, func);
if (psdev)
found_dev = pcistub_device_get_pci_dev(pdev, psdev);
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
return found_dev;
}
struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
struct pci_dev *dev)
{
struct pcistub_device *psdev;
struct pci_dev *found_dev = NULL;
unsigned long flags;
spin_lock_irqsave(&pcistub_devices_lock, flags);
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
if (psdev->dev == dev) {
found_dev = pcistub_device_get_pci_dev(pdev, psdev);
break;
}
}
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
return found_dev;
}
/*
* Called when:
* - XenBus state has been reconfigure (pci unplug). See xen_pcibk_remove_device
* - XenBus state has been disconnected (guest shutdown). See xen_pcibk_xenbus_remove
* - 'echo BDF > unbind' on pciback module with no guest attached. See pcistub_remove
* - 'echo BDF > unbind' with a guest still using it. See pcistub_remove
*
* As such we have to be careful.
*
* To make this easier, the caller has to hold the device lock.
*/
void pcistub_put_pci_dev(struct pci_dev *dev)
{
struct pcistub_device *psdev, *found_psdev = NULL;
unsigned long flags;
struct xen_pcibk_dev_data *dev_data;
int ret;
spin_lock_irqsave(&pcistub_devices_lock, flags);
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
if (psdev->dev == dev) {
found_psdev = psdev;
break;
}
}
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
if (WARN_ON(!found_psdev))
return;
/*hold this lock for avoiding breaking link between
* pcistub and xen_pcibk when AER is in processing
*/
down_write(&pcistub_sem);
/* Cleanup our device
* (so it's ready for the next domain)
*/
device_lock_assert(&dev->dev);
__pci_reset_function_locked(dev);
dev_data = pci_get_drvdata(dev);
ret = pci_load_saved_state(dev, dev_data->pci_saved_state);
if (!ret) {
/*
* The usual sequence is pci_save_state & pci_restore_state
* but the guest might have messed the configuration space up.
* Use the initial version (when device was bound to us).
*/
pci_restore_state(dev);
} else
dev_info(&dev->dev, "Could not reload PCI state\n");
/* This disables the device. */
xen_pcibk_reset_device(dev);
/* And cleanup up our emulated fields. */
xen_pcibk_config_reset_dev(dev);
xen_pcibk_config_free_dyn_fields(dev);
dev_data->allow_interrupt_control = 0;
xen_unregister_device_domain_owner(dev);
spin_lock_irqsave(&found_psdev->lock, flags);
found_psdev->pdev = NULL;
spin_unlock_irqrestore(&found_psdev->lock, flags);
pcistub_device_put(found_psdev);
up_write(&pcistub_sem);
}
static int pcistub_match_one(struct pci_dev *dev,
struct pcistub_device_id *pdev_id)
{
/* Match the specified device by domain, bus, slot, func and also if
* any of the device's parent bridges match.
*/
for (; dev != NULL; dev = dev->bus->self) {
if (pci_domain_nr(dev->bus) == pdev_id->domain
&& dev->bus->number == pdev_id->bus
&& dev->devfn == pdev_id->devfn)
return 1;
/* Sometimes topmost bridge links to itself. */
if (dev == dev->bus->self)
break;
}
return 0;
}
static int pcistub_match(struct pci_dev *dev)
{
struct pcistub_device_id *pdev_id;
unsigned long flags;
int found = 0;
spin_lock_irqsave(&device_ids_lock, flags);
list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
if (pcistub_match_one(dev, pdev_id)) {
found = 1;
break;
}
}
spin_unlock_irqrestore(&device_ids_lock, flags);
return found;
}
static int pcistub_init_device(struct pci_dev *dev)
{
struct xen_pcibk_dev_data *dev_data;
int err = 0;
dev_dbg(&dev->dev, "initializing...\n");
/* The PCI backend is not intended to be a module (or to work with
* removable PCI devices (yet). If it were, xen_pcibk_config_free()
* would need to be called somewhere to free the memory allocated
* here and then to call kfree(pci_get_drvdata(psdev->dev)).
*/
dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]")
+ strlen(pci_name(dev)) + 1, GFP_KERNEL);
if (!dev_data) {
err = -ENOMEM;
goto out;
}
pci_set_drvdata(dev, dev_data);
/*
* Setup name for fake IRQ handler. It will only be enabled
* once the device is turned on by the guest.
*/
sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
dev_dbg(&dev->dev, "initializing config\n");
init_waitqueue_head(&xen_pcibk_aer_wait_queue);
err = xen_pcibk_config_init_dev(dev);
if (err)
goto out;
/* HACK: Force device (& ACPI) to determine what IRQ it's on - we
* must do this here because pcibios_enable_device may specify
* the pci device's true irq (and possibly its other resources)
* if they differ from what's in the configuration space.
* This makes the assumption that the device's resources won't
* change after this point (otherwise this code may break!)
*/
dev_dbg(&dev->dev, "enabling device\n");
err = pci_enable_device(dev);
if (err)
goto config_release;
if (dev->msix_cap) {
struct physdev_pci_device ppdev = {
.seg = pci_domain_nr(dev->bus),
.bus = dev->bus->number,
.devfn = dev->devfn
};
err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev);
if (err && err != -ENOSYS)
dev_err(&dev->dev, "MSI-X preparation failed (%d)\n",
err);
}
/* We need the device active to save the state. */
dev_dbg(&dev->dev, "save state of device\n");
pci_save_state(dev);
dev_data->pci_saved_state = pci_store_saved_state(dev);
if (!dev_data->pci_saved_state)
dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
else {
dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n");
__pci_reset_function_locked(dev);
pci_restore_state(dev);
}
/* Now disable the device (this also ensures some private device
* data is setup before we export)
*/
dev_dbg(&dev->dev, "reset device\n");
xen_pcibk_reset_device(dev);
pci_set_dev_assigned(dev);
return 0;
config_release:
xen_pcibk_config_free_dev(dev);
out:
pci_set_drvdata(dev, NULL);
kfree(dev_data);
return err;
}
/*
* Because some initialization still happens on
* devices during fs_initcall, we need to defer
* full initialization of our devices until
* device_initcall.
*/
static int __init pcistub_init_devices_late(void)
{
struct pcistub_device *psdev;
unsigned long flags;
int err = 0;
spin_lock_irqsave(&pcistub_devices_lock, flags);
while (!list_empty(&seized_devices)) {
psdev = container_of(seized_devices.next,
struct pcistub_device, dev_list);
list_del(&psdev->dev_list);
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
err = pcistub_init_device(psdev->dev);
if (err) {
dev_err(&psdev->dev->dev,
"error %d initializing device\n", err);
kfree(psdev);
psdev = NULL;
}
spin_lock_irqsave(&pcistub_devices_lock, flags);
if (psdev)
list_add_tail(&psdev->dev_list, &pcistub_devices);
}
initialize_devices = 1;
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
return 0;
}
static void pcistub_device_id_add_list(struct pcistub_device_id *new,
int domain, int bus, unsigned int devfn)
{
struct pcistub_device_id *pci_dev_id;
unsigned long flags;
int found = 0;
spin_lock_irqsave(&device_ids_lock, flags);
list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
if (pci_dev_id->domain == domain && pci_dev_id->bus == bus &&
pci_dev_id->devfn == devfn) {
found = 1;
break;
}
}
if (!found) {
new->domain = domain;
new->bus = bus;
new->devfn = devfn;
list_add_tail(&new->slot_list, &pcistub_device_ids);
}
spin_unlock_irqrestore(&device_ids_lock, flags);
if (found)
kfree(new);
}
static int pcistub_seize(struct pci_dev *dev,
struct pcistub_device_id *pci_dev_id)
{
struct pcistub_device *psdev;
unsigned long flags;
int err = 0;
psdev = pcistub_device_alloc(dev);
if (!psdev) {
kfree(pci_dev_id);
return -ENOMEM;
}
spin_lock_irqsave(&pcistub_devices_lock, flags);
if (initialize_devices) {
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
/* don't want irqs disabled when calling pcistub_init_device */
err = pcistub_init_device(psdev->dev);
spin_lock_irqsave(&pcistub_devices_lock, flags);
if (!err)
list_add(&psdev->dev_list, &pcistub_devices);
} else {
dev_dbg(&dev->dev, "deferring initialization\n");
list_add(&psdev->dev_list, &seized_devices);
}
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
if (err) {
kfree(pci_dev_id);
pcistub_device_put(psdev);
} else if (pci_dev_id)
pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus),
dev->bus->number, dev->devfn);
return err;
}
/* Called when 'bind'. This means we must _NOT_ call pci_reset_function or
* other functions that take the sysfs lock. */
static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int err = 0, match;
struct pcistub_device_id *pci_dev_id = NULL;
dev_dbg(&dev->dev, "probing...\n");
match = pcistub_match(dev);
if ((dev->driver_override &&
!strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) ||
match) {
if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
&& dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
dev_err(&dev->dev, "can't export pci devices that "
"don't have a normal (0) or bridge (1) "
"header type!\n");
err = -ENODEV;
goto out;
}
if (!match) {
pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
if (!pci_dev_id) {
err = -ENOMEM;
goto out;
}
}
dev_info(&dev->dev, "seizing device\n");
err = pcistub_seize(dev, pci_dev_id);
} else
/* Didn't find the device */
err = -ENODEV;
out:
return err;
}
/* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or
* other functions that take the sysfs lock. */
static void pcistub_remove(struct pci_dev *dev)
{
struct pcistub_device *psdev, *found_psdev = NULL;
unsigned long flags;
dev_dbg(&dev->dev, "removing\n");
spin_lock_irqsave(&pcistub_devices_lock, flags);
xen_pcibk_config_quirk_release(dev);
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
if (psdev->dev == dev) {
found_psdev = psdev;
break;
}
}
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
if (found_psdev) {
dev_dbg(&dev->dev, "found device to remove %s\n",
found_psdev->pdev ? "- in-use" : "");
if (found_psdev->pdev) {
int domid = xen_find_device_domain_owner(dev);
dev_warn(&dev->dev, "****** removing device %s while still in-use by domain %d! ******\n",
pci_name(found_psdev->dev), domid);
dev_warn(&dev->dev, "****** driver domain may still access this device's i/o resources!\n");
dev_warn(&dev->dev, "****** shutdown driver domain before binding device\n");
dev_warn(&dev->dev, "****** to other drivers or domains\n");
/* N.B. This ends up calling pcistub_put_pci_dev which ends up
* doing the FLR. */
xen_pcibk_release_pci_dev(found_psdev->pdev,
found_psdev->dev,
false /* caller holds the lock. */);
}
spin_lock_irqsave(&pcistub_devices_lock, flags);
list_del(&found_psdev->dev_list);
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
/* the final put for releasing from the list */
pcistub_device_put(found_psdev);
}
}
static const struct pci_device_id pcistub_ids[] = {
{
.vendor = PCI_ANY_ID,
.device = PCI_ANY_ID,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{0,},
};
#define PCI_NODENAME_MAX 40
static void kill_domain_by_device(struct pcistub_device *psdev)
{
struct xenbus_transaction xbt;
int err;
char nodename[PCI_NODENAME_MAX];
BUG_ON(!psdev);
snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
psdev->pdev->xdev->otherend_id);
again:
err = xenbus_transaction_start(&xbt);
if (err) {
dev_err(&psdev->dev->dev,
"error %d when start xenbus transaction\n", err);
return;
}
/*PV AER handlers will set this flag*/
xenbus_printf(xbt, nodename, "aerState" , "aerfail");
err = xenbus_transaction_end(xbt, 0);
if (err) {
if (err == -EAGAIN)
goto again;
dev_err(&psdev->dev->dev,
"error %d when end xenbus transaction\n", err);
return;
}
}
/* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
* backend need to have cooperation. In xen_pcibk, those steps will do similar
* jobs: send service request and waiting for front_end response.
*/
static pci_ers_result_t common_process(struct pcistub_device *psdev,
pci_channel_state_t state, int aer_cmd,
pci_ers_result_t result)
{
pci_ers_result_t res = result;
struct xen_pcie_aer_op *aer_op;
struct xen_pcibk_device *pdev = psdev->pdev;
struct xen_pci_sharedinfo *sh_info = pdev->sh_info;
int ret;
/*with PV AER drivers*/
aer_op = &(sh_info->aer_op);
aer_op->cmd = aer_cmd ;
/*useful for error_detected callback*/
aer_op->err = state;
/*pcifront_end BDF*/
ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
&aer_op->domain, &aer_op->bus, &aer_op->devfn);
if (!ret) {
dev_err(&psdev->dev->dev, "failed to get pcifront device\n");
return PCI_ERS_RESULT_NONE;
}
wmb();
dev_dbg(&psdev->dev->dev, "aer_op %x dom %x bus %x devfn %x\n",
aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
/*local flag to mark there's aer request, xen_pcibk callback will use
* this flag to judge whether we need to check pci-front give aer
* service ack signal
*/
set_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags);
/*It is possible that a pcifront conf_read_write ops request invokes
* the callback which cause the spurious execution of wake_up.
* Yet it is harmless and better than a spinlock here
*/
set_bit(_XEN_PCIB_active,
(unsigned long *)&sh_info->flags);
wmb();
notify_remote_via_irq(pdev->evtchn_irq);
/* Enable IRQ to signal "request done". */
xen_pcibk_lateeoi(pdev, 0);
ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
!(test_bit(_XEN_PCIB_active, (unsigned long *)
&sh_info->flags)), 300*HZ);
/* Enable IRQ for pcifront request if not already active. */
if (!test_bit(_PDEVF_op_active, &pdev->flags))
xen_pcibk_lateeoi(pdev, 0);
if (!ret) {
if (test_bit(_XEN_PCIB_active,
(unsigned long *)&sh_info->flags)) {
dev_err(&psdev->dev->dev,
"pcifront aer process not responding!\n");
clear_bit(_XEN_PCIB_active,
(unsigned long *)&sh_info->flags);
aer_op->err = PCI_ERS_RESULT_NONE;
return res;
}
}
clear_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags);
res = (pci_ers_result_t)aer_op->err;
return res;
}
/*
* xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case
* of the device driver could provide this service, and then wait for pcifront
* ack.
* @dev: pointer to PCI devices
* return value is used by aer_core do_recovery policy
*/
static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
{
struct pcistub_device *psdev;
pci_ers_result_t result;
result = PCI_ERS_RESULT_RECOVERED;
dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
dev->bus->number, dev->devfn);
down_write(&pcistub_sem);
psdev = pcistub_device_find(pci_domain_nr(dev->bus),
dev->bus->number,
PCI_SLOT(dev->devfn),
PCI_FUNC(dev->devfn));
if (!psdev || !psdev->pdev) {
dev_err(&dev->dev, "device is not found/assigned\n");
goto end;
}
if (!psdev->pdev->sh_info) {
dev_err(&dev->dev, "device is not connected or owned"
" by HVM, kill it\n");
kill_domain_by_device(psdev);
goto end;
}
if (!test_bit(_XEN_PCIB_AERHANDLER,
(unsigned long *)&psdev->pdev->sh_info->flags)) {
dev_err(&dev->dev,
"guest with no AER driver should have been killed\n");
goto end;
}
result = common_process(psdev, pci_channel_io_normal, XEN_PCI_OP_aer_slotreset, result);
if (result == PCI_ERS_RESULT_NONE ||
result == PCI_ERS_RESULT_DISCONNECT) {
dev_dbg(&dev->dev,
"No AER slot_reset service or disconnected!\n");
kill_domain_by_device(psdev);
}
end:
if (psdev)
pcistub_device_put(psdev);
up_write(&pcistub_sem);
return result;
}
/*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront
* in case of the device driver could provide this service, and then wait
* for pcifront ack
* @dev: pointer to PCI devices
* return value is used by aer_core do_recovery policy
*/
static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
{
struct pcistub_device *psdev;
pci_ers_result_t result;
result = PCI_ERS_RESULT_RECOVERED;
dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
dev->bus->number, dev->devfn);
down_write(&pcistub_sem);
psdev = pcistub_device_find(pci_domain_nr(dev->bus),
dev->bus->number,
PCI_SLOT(dev->devfn),
PCI_FUNC(dev->devfn));
if (!psdev || !psdev->pdev) {
dev_err(&dev->dev, "device is not found/assigned\n");
goto end;
}
if (!psdev->pdev->sh_info) {
dev_err(&dev->dev, "device is not connected or owned"
" by HVM, kill it\n");
kill_domain_by_device(psdev);
goto end;
}
if (!test_bit(_XEN_PCIB_AERHANDLER,
(unsigned long *)&psdev->pdev->sh_info->flags)) {
dev_err(&dev->dev,
"guest with no AER driver should have been killed\n");
goto end;
}
result = common_process(psdev, pci_channel_io_normal, XEN_PCI_OP_aer_mmio, result);
if (result == PCI_ERS_RESULT_NONE ||
result == PCI_ERS_RESULT_DISCONNECT) {
dev_dbg(&dev->dev,
"No AER mmio_enabled service or disconnected!\n");
kill_domain_by_device(psdev);
}
end:
if (psdev)
pcistub_device_put(psdev);
up_write(&pcistub_sem);
return result;
}
/*xen_pcibk_error_detected: it will send the error_detected request to pcifront
* in case of the device driver could provide this service, and then wait
* for pcifront ack.
* @dev: pointer to PCI devices
* @error: the current PCI connection state
* return value is used by aer_core do_recovery policy
*/
static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev,
pci_channel_state_t error)
{
struct pcistub_device *psdev;
pci_ers_result_t result;
result = PCI_ERS_RESULT_CAN_RECOVER;
dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n",
dev->bus->number, dev->devfn);
down_write(&pcistub_sem);
psdev = pcistub_device_find(pci_domain_nr(dev->bus),
dev->bus->number,
PCI_SLOT(dev->devfn),
PCI_FUNC(dev->devfn));
if (!psdev || !psdev->pdev) {
dev_err(&dev->dev, "device is not found/assigned\n");
goto end;
}
if (!psdev->pdev->sh_info) {
dev_err(&dev->dev, "device is not connected or owned"
" by HVM, kill it\n");
kill_domain_by_device(psdev);
goto end;
}
/*Guest owns the device yet no aer handler regiested, kill guest*/
if (!test_bit(_XEN_PCIB_AERHANDLER,
(unsigned long *)&psdev->pdev->sh_info->flags)) {
dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
kill_domain_by_device(psdev);
goto end;
}
result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
if (result == PCI_ERS_RESULT_NONE ||
result == PCI_ERS_RESULT_DISCONNECT) {
dev_dbg(&dev->dev,
"No AER error_detected service or disconnected!\n");
kill_domain_by_device(psdev);
}
end:
if (psdev)
pcistub_device_put(psdev);
up_write(&pcistub_sem);
return result;
}
/*xen_pcibk_error_resume: it will send the error_resume request to pcifront
* in case of the device driver could provide this service, and then wait
* for pcifront ack.
* @dev: pointer to PCI devices
*/
static void xen_pcibk_error_resume(struct pci_dev *dev)
{
struct pcistub_device *psdev;
dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
dev->bus->number, dev->devfn);
down_write(&pcistub_sem);
psdev = pcistub_device_find(pci_domain_nr(dev->bus),
dev->bus->number,
PCI_SLOT(dev->devfn),
PCI_FUNC(dev->devfn));
if (!psdev || !psdev->pdev) {
dev_err(&dev->dev, "device is not found/assigned\n");
goto end;
}
if (!psdev->pdev->sh_info) {
dev_err(&dev->dev, "device is not connected or owned"
" by HVM, kill it\n");
kill_domain_by_device(psdev);
goto end;
}
if (!test_bit(_XEN_PCIB_AERHANDLER,
(unsigned long *)&psdev->pdev->sh_info->flags)) {
dev_err(&dev->dev,
"guest with no AER driver should have been killed\n");
kill_domain_by_device(psdev);
goto end;
}
common_process(psdev, pci_channel_io_normal, XEN_PCI_OP_aer_resume,
PCI_ERS_RESULT_RECOVERED);
end:
if (psdev)
pcistub_device_put(psdev);
up_write(&pcistub_sem);
return;
}
/*add xen_pcibk AER handling*/
static const struct pci_error_handlers xen_pcibk_error_handler = {
.error_detected = xen_pcibk_error_detected,
.mmio_enabled = xen_pcibk_mmio_enabled,
.slot_reset = xen_pcibk_slot_reset,
.resume = xen_pcibk_error_resume,
};
/*
* Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
* for a normal device. I don't want it to be loaded automatically.
*/
static struct pci_driver xen_pcibk_pci_driver = {
/* The name should be xen_pciback, but until the tools are updated
* we will keep it as pciback. */
.name = PCISTUB_DRIVER_NAME,
.id_table = pcistub_ids,
.probe = pcistub_probe,
.remove = pcistub_remove,
.err_handler = &xen_pcibk_error_handler,
};
static inline int str_to_slot(const char *buf, int *domain, int *bus,
int *slot, int *func)
{
int parsed = 0;
switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func,
&parsed)) {
case 3:
*func = -1;
sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed);
break;
case 2:
*slot = *func = -1;
sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed);
break;
}
if (parsed && !buf[parsed])
return 0;
/* try again without domain */
*domain = 0;
switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) {
case 2:
*func = -1;
sscanf(buf, " %x:%x.* %n", bus, slot, &parsed);
break;
case 1:
*slot = *func = -1;
sscanf(buf, " %x:*.* %n", bus, &parsed);
break;
}
if (parsed && !buf[parsed])
return 0;
return -EINVAL;
}
static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
*slot, int *func, int *reg, int *size, int *mask)
{
int parsed = 0;
sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func,
reg, size, mask, &parsed);
if (parsed && !buf[parsed])
return 0;
/* try again without domain */
*domain = 0;
sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size,
mask, &parsed);
if (parsed && !buf[parsed])
return 0;
return -EINVAL;
}
static int pcistub_device_id_add(int domain, int bus, int slot, int func)
{
struct pcistub_device_id *pci_dev_id;
int rc = 0, devfn = PCI_DEVFN(slot, func);
if (slot < 0) {
for (slot = 0; !rc && slot < 32; ++slot)
rc = pcistub_device_id_add(domain, bus, slot, func);
return rc;
}
if (func < 0) {
for (func = 0; !rc && func < 8; ++func)
rc = pcistub_device_id_add(domain, bus, slot, func);
return rc;
}
if ((
#if !defined(MODULE) /* pci_domains_supported is not being exported */ \
|| !defined(CONFIG_PCI_DOMAINS)
!pci_domains_supported ? domain :
#endif
domain < 0 || domain > 0xffff)
|| bus < 0 || bus > 0xff
|| PCI_SLOT(devfn) != slot
|| PCI_FUNC(devfn) != func)
return -EINVAL;
pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
if (!pci_dev_id)
return -ENOMEM;
pr_debug("wants to seize %04x:%02x:%02x.%d\n",
domain, bus, slot, func);
pcistub_device_id_add_list(pci_dev_id, domain, bus, devfn);
return 0;
}
static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
{
struct pcistub_device_id *pci_dev_id, *t;
int err = -ENOENT;
unsigned long flags;
spin_lock_irqsave(&device_ids_lock, flags);
list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
slot_list) {
if (pci_dev_id->domain == domain && pci_dev_id->bus == bus
&& (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot)
&& (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) {
/* Don't break; here because it's possible the same
* slot could be in the list more than once
*/
list_del(&pci_dev_id->slot_list);
kfree(pci_dev_id);
err = 0;
pr_debug("removed %04x:%02x:%02x.%d from seize list\n",
domain, bus, slot, func);
}
}
spin_unlock_irqrestore(&device_ids_lock, flags);
return err;
}
static int pcistub_reg_add(int domain, int bus, int slot, int func,
unsigned int reg, unsigned int size,
unsigned int mask)
{
int err = 0;
struct pcistub_device *psdev;
struct pci_dev *dev;
struct config_field *field;
if (reg > 0xfff || (size < 4 && (mask >> (size * 8))))
return -EINVAL;
psdev = pcistub_device_find(domain, bus, slot, func);
if (!psdev) {
err = -ENODEV;
goto out;
}
dev = psdev->dev;
field = kzalloc(sizeof(*field), GFP_KERNEL);
if (!field) {
err = -ENOMEM;
goto out;
}
field->offset = reg;
field->size = size;
field->mask = mask;
field->init = NULL;
field->reset = NULL;
field->release = NULL;
field->clean = xen_pcibk_config_field_free;
err = xen_pcibk_config_quirks_add_field(dev, field);
if (err)
kfree(field);
out:
if (psdev)
pcistub_device_put(psdev);
return err;
}
static ssize_t new_slot_store(struct device_driver *drv, const char *buf,
size_t count)
{
int domain, bus, slot, func;
int err;
err = str_to_slot(buf, &domain, &bus, &slot, &func);
if (err)
goto out;
err = pcistub_device_id_add(domain, bus, slot, func);
out:
if (!err)
err = count;
return err;
}
static DRIVER_ATTR_WO(new_slot);
static ssize_t remove_slot_store(struct device_driver *drv, const char *buf,
size_t count)
{
int domain, bus, slot, func;
int err;
err = str_to_slot(buf, &domain, &bus, &slot, &func);
if (err)
goto out;
err = pcistub_device_id_remove(domain, bus, slot, func);
out:
if (!err)
err = count;
return err;
}
static DRIVER_ATTR_WO(remove_slot);
static ssize_t slots_show(struct device_driver *drv, char *buf)
{
struct pcistub_device_id *pci_dev_id;
size_t count = 0;
unsigned long flags;
spin_lock_irqsave(&device_ids_lock, flags);
list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
if (count >= PAGE_SIZE)
break;
count += scnprintf(buf + count, PAGE_SIZE - count,
"%04x:%02x:%02x.%d\n",
pci_dev_id->domain, pci_dev_id->bus,
PCI_SLOT(pci_dev_id->devfn),
PCI_FUNC(pci_dev_id->devfn));
}
spin_unlock_irqrestore(&device_ids_lock, flags);
return count;
}
static DRIVER_ATTR_RO(slots);
static ssize_t irq_handlers_show(struct device_driver *drv, char *buf)
{
struct pcistub_device *psdev;
struct xen_pcibk_dev_data *dev_data;
size_t count = 0;
unsigned long flags;
spin_lock_irqsave(&pcistub_devices_lock, flags);
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
if (count >= PAGE_SIZE)
break;
if (!psdev->dev)
continue;
dev_data = pci_get_drvdata(psdev->dev);
if (!dev_data)
continue;
count +=
scnprintf(buf + count, PAGE_SIZE - count,
"%s:%s:%sing:%ld\n",
pci_name(psdev->dev),
dev_data->isr_on ? "on" : "off",
dev_data->ack_intr ? "ack" : "not ack",
dev_data->handled);
}
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
return count;
}
static DRIVER_ATTR_RO(irq_handlers);
static ssize_t irq_handler_state_store(struct device_driver *drv,
const char *buf, size_t count)
{
struct pcistub_device *psdev;
struct xen_pcibk_dev_data *dev_data;
int domain, bus, slot, func;
int err;
err = str_to_slot(buf, &domain, &bus, &slot, &func);
if (err)
return err;
psdev = pcistub_device_find(domain, bus, slot, func);
if (!psdev) {
err = -ENOENT;
goto out;
}
dev_data = pci_get_drvdata(psdev->dev);
if (!dev_data) {
err = -ENOENT;
goto out;
}
dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
dev_data->irq_name, dev_data->isr_on,
!dev_data->isr_on);
dev_data->isr_on = !(dev_data->isr_on);
if (dev_data->isr_on)
dev_data->ack_intr = 1;
out:
if (psdev)
pcistub_device_put(psdev);
if (!err)
err = count;
return err;
}
static DRIVER_ATTR_WO(irq_handler_state);
static ssize_t quirks_store(struct device_driver *drv, const char *buf,
size_t count)
{
int domain, bus, slot, func, reg, size, mask;
int err;
err = str_to_quirk(buf, &domain, &bus, &slot, &func, &reg, &size,
&mask);
if (err)
goto out;
err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
out:
if (!err)
err = count;
return err;
}
static ssize_t quirks_show(struct device_driver *drv, char *buf)
{
int count = 0;
unsigned long flags;
struct xen_pcibk_config_quirk *quirk;
struct xen_pcibk_dev_data *dev_data;
const struct config_field *field;
const struct config_field_entry *cfg_entry;
spin_lock_irqsave(&device_ids_lock, flags);
list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
if (count >= PAGE_SIZE)
goto out;
count += scnprintf(buf + count, PAGE_SIZE - count,
"%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
quirk->pdev->bus->number,
PCI_SLOT(quirk->pdev->devfn),
PCI_FUNC(quirk->pdev->devfn),
quirk->devid.vendor, quirk->devid.device,
quirk->devid.subvendor,
quirk->devid.subdevice);
dev_data = pci_get_drvdata(quirk->pdev);
list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
field = cfg_entry->field;
if (count >= PAGE_SIZE)
goto out;
count += scnprintf(buf + count, PAGE_SIZE - count,
"\t\t%08x:%01x:%08x\n",
cfg_entry->base_offset +
field->offset, field->size,
field->mask);
}
}
out:
spin_unlock_irqrestore(&device_ids_lock, flags);
return count;
}
static DRIVER_ATTR_RW(quirks);
static ssize_t permissive_store(struct device_driver *drv, const char *buf,
size_t count)
{
int domain, bus, slot, func;
int err;
struct pcistub_device *psdev;
struct xen_pcibk_dev_data *dev_data;
err = str_to_slot(buf, &domain, &bus, &slot, &func);
if (err)
goto out;
psdev = pcistub_device_find(domain, bus, slot, func);
if (!psdev) {
err = -ENODEV;
goto out;
}
dev_data = pci_get_drvdata(psdev->dev);
/* the driver data for a device should never be null at this point */
if (!dev_data) {
err = -ENXIO;
goto release;
}
if (!dev_data->permissive) {
dev_data->permissive = 1;
/* Let user know that what they're doing could be unsafe */
dev_warn(&psdev->dev->dev, "enabling permissive mode "
"configuration space accesses!\n");
dev_warn(&psdev->dev->dev,
"permissive mode is potentially unsafe!\n");
}
release:
pcistub_device_put(psdev);
out:
if (!err)
err = count;
return err;
}
static ssize_t permissive_show(struct device_driver *drv, char *buf)
{
struct pcistub_device *psdev;
struct xen_pcibk_dev_data *dev_data;
size_t count = 0;
unsigned long flags;
spin_lock_irqsave(&pcistub_devices_lock, flags);
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
if (count >= PAGE_SIZE)
break;
if (!psdev->dev)
continue;
dev_data = pci_get_drvdata(psdev->dev);
if (!dev_data || !dev_data->permissive)
continue;
count +=
scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
pci_name(psdev->dev));
}
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
return count;
}
static DRIVER_ATTR_RW(permissive);
static ssize_t allow_interrupt_control_store(struct device_driver *drv,
const char *buf, size_t count)
{
int domain, bus, slot, func;
int err;
struct pcistub_device *psdev;
struct xen_pcibk_dev_data *dev_data;
err = str_to_slot(buf, &domain, &bus, &slot, &func);
if (err)
goto out;
psdev = pcistub_device_find(domain, bus, slot, func);
if (!psdev) {
err = -ENODEV;
goto out;
}
dev_data = pci_get_drvdata(psdev->dev);
/* the driver data for a device should never be null at this point */
if (!dev_data) {
err = -ENXIO;
goto release;
}
dev_data->allow_interrupt_control = 1;
release:
pcistub_device_put(psdev);
out:
if (!err)
err = count;
return err;
}
static ssize_t allow_interrupt_control_show(struct device_driver *drv,
char *buf)
{
struct pcistub_device *psdev;
struct xen_pcibk_dev_data *dev_data;
size_t count = 0;
unsigned long flags;
spin_lock_irqsave(&pcistub_devices_lock, flags);
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
if (count >= PAGE_SIZE)
break;
if (!psdev->dev)
continue;
dev_data = pci_get_drvdata(psdev->dev);
if (!dev_data || !dev_data->allow_interrupt_control)
continue;
count +=
scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
pci_name(psdev->dev));
}
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
return count;
}
static DRIVER_ATTR_RW(allow_interrupt_control);
static void pcistub_exit(void)
{
driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
driver_remove_file(&xen_pcibk_pci_driver.driver,
&driver_attr_remove_slot);
driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
driver_remove_file(&xen_pcibk_pci_driver.driver,
&driver_attr_permissive);
driver_remove_file(&xen_pcibk_pci_driver.driver,
&driver_attr_allow_interrupt_control);
driver_remove_file(&xen_pcibk_pci_driver.driver,
&driver_attr_irq_handlers);
driver_remove_file(&xen_pcibk_pci_driver.driver,
&driver_attr_irq_handler_state);
pci_unregister_driver(&xen_pcibk_pci_driver);
}
static int __init pcistub_init(void)
{
int pos = 0;
int err = 0;
int domain, bus, slot, func;
int parsed;
if (pci_devs_to_hide && *pci_devs_to_hide) {
do {
parsed = 0;
err = sscanf(pci_devs_to_hide + pos,
" (%x:%x:%x.%x) %n",
&domain, &bus, &slot, &func, &parsed);
switch (err) {
case 3:
func = -1;
sscanf(pci_devs_to_hide + pos,
" (%x:%x:%x.*) %n",
&domain, &bus, &slot, &parsed);
break;
case 2:
slot = func = -1;
sscanf(pci_devs_to_hide + pos,
" (%x:%x:*.*) %n",
&domain, &bus, &parsed);
break;
}
if (!parsed) {
domain = 0;
err = sscanf(pci_devs_to_hide + pos,
" (%x:%x.%x) %n",
&bus, &slot, &func, &parsed);
switch (err) {
case 2:
func = -1;
sscanf(pci_devs_to_hide + pos,
" (%x:%x.*) %n",
&bus, &slot, &parsed);
break;
case 1:
slot = func = -1;
sscanf(pci_devs_to_hide + pos,
" (%x:*.*) %n",
&bus, &parsed);
break;
}
}
if (parsed <= 0)
goto parse_error;
err = pcistub_device_id_add(domain, bus, slot, func);
if (err)
goto out;
pos += parsed;
} while (pci_devs_to_hide[pos]);
}
/* If we're the first PCI Device Driver to register, we're the
* first one to get offered PCI devices as they become
* available (and thus we can be the first to grab them)
*/
err = pci_register_driver(&xen_pcibk_pci_driver);
if (err < 0)
goto out;
err = driver_create_file(&xen_pcibk_pci_driver.driver,
&driver_attr_new_slot);
if (!err)
err = driver_create_file(&xen_pcibk_pci_driver.driver,
&driver_attr_remove_slot);
if (!err)
err = driver_create_file(&xen_pcibk_pci_driver.driver,
&driver_attr_slots);
if (!err)
err = driver_create_file(&xen_pcibk_pci_driver.driver,
&driver_attr_quirks);
if (!err)
err = driver_create_file(&xen_pcibk_pci_driver.driver,
&driver_attr_permissive);
if (!err)
err = driver_create_file(&xen_pcibk_pci_driver.driver,
&driver_attr_allow_interrupt_control);
if (!err)
err = driver_create_file(&xen_pcibk_pci_driver.driver,
&driver_attr_irq_handlers);
if (!err)
err = driver_create_file(&xen_pcibk_pci_driver.driver,
&driver_attr_irq_handler_state);
if (err)
pcistub_exit();
out:
return err;
parse_error:
pr_err("Error parsing pci_devs_to_hide at \"%s\"\n",
pci_devs_to_hide + pos);
return -EINVAL;
}
#ifndef MODULE
/*
* fs_initcall happens before device_initcall
* so xen_pcibk *should* get called first (b/c we
* want to suck up any device before other drivers
* get a chance by being the first pci device
* driver to register)
*/
fs_initcall(pcistub_init);
#endif
#ifdef CONFIG_PCI_IOV
static struct pcistub_device *find_vfs(const struct pci_dev *pdev)
{
struct pcistub_device *psdev = NULL;
unsigned long flags;
bool found = false;
spin_lock_irqsave(&pcistub_devices_lock, flags);
list_for_each_entry(psdev, &pcistub_devices, dev_list) {
if (!psdev->pdev && psdev->dev != pdev
&& pci_physfn(psdev->dev) == pdev) {
found = true;
break;
}
}
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
if (found)
return psdev;
return NULL;
}
static int pci_stub_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
const struct pci_dev *pdev = to_pci_dev(dev);
if (action != BUS_NOTIFY_UNBIND_DRIVER)
return NOTIFY_DONE;
if (!pdev->is_physfn)
return NOTIFY_DONE;
for (;;) {
struct pcistub_device *psdev = find_vfs(pdev);
if (!psdev)
break;
device_release_driver(&psdev->dev->dev);
}
return NOTIFY_DONE;
}
static struct notifier_block pci_stub_nb = {
.notifier_call = pci_stub_notifier,
};
#endif
static int __init xen_pcibk_init(void)
{
int err;
if (!xen_initial_domain())
return -ENODEV;
err = xen_pcibk_config_init();
if (err)
return err;
#ifdef MODULE
err = pcistub_init();
if (err < 0)
return err;
#endif
pcistub_init_devices_late();
err = xen_pcibk_xenbus_register();
if (err)
pcistub_exit();
#ifdef CONFIG_PCI_IOV
else
bus_register_notifier(&pci_bus_type, &pci_stub_nb);
#endif
return err;
}
static void __exit xen_pcibk_cleanup(void)
{
#ifdef CONFIG_PCI_IOV
bus_unregister_notifier(&pci_bus_type, &pci_stub_nb);
#endif
xen_pcibk_xenbus_unregister();
pcistub_exit();
}
module_init(xen_pcibk_init);
module_exit(xen_pcibk_cleanup);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("xen-backend:pci");