2:01 a.m.
We should bind pci device to original driver when pciBindDeviceToStub() failed.
If the pci device is not bound to any driver before calling pciBindDeviceToStub(),
we should only unbind it from pci-stub. If it is bound to pci-stub, we should not
unbid it from pci-stub.
---
src/util/pci.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++------
1 files changed, 80 insertions(+), 10 deletions(-)
diff --git a/src/util/pci.c b/src/util/pci.c
index 8d2dbb0..e30f5cf 100644
--- a/src/util/pci.c
+++ b/src/util/pci.c
@@ -65,6 +65,11 @@ struct _pciDevice {
unsigned has_flr : 1;
unsigned has_pm_reset : 1;
unsigned managed : 1;
+
+ /* used by reattach function */
+ unsigned unbind_from_stub : 1;
+ unsigned remove_slot : 1;
+ unsigned reprobe : 1;
};
struct _pciDeviceList {
@@ -834,11 +839,25 @@ recheck:
}
+static int pciUnBindDeviceFromStub(pciDevice *dev, const char *driver);
static int
pciBindDeviceToStub(pciDevice *dev, const char *driver)
{
char drvdir[PATH_MAX];
char path[PATH_MAX];
+ int reprobe = 0;
+ int ret = 0;
+
+ /* check whether the device is already bound to a driver */
+ pciDriverDir(drvdir, sizeof(drvdir), driver);
+ pciDeviceFile(path, sizeof(path), dev->name, "driver");
+ if (virFileExists(path)) {
+ if (virFileLinkPointsTo(path, drvdir)) {
+ /* The device is already bound to pci-stub */
+ return 0;
+ }
+ reprobe = 1;
+ }
/* Add the PCI device ID to the stub's dynamic ID table;
* this is needed to allow us to bind the device to the stub.
@@ -856,16 +875,31 @@ pciBindDeviceToStub(pciDevice *dev, const char *driver)
return -1;
}
+ /* check whether the device is bound to pci-stub when we write dev->id to
+ * new_id.
+ */
+ pciDriverDir(drvdir, sizeof(drvdir), driver);
+ pciDeviceFile(path, sizeof(path), dev->name, "driver");
+ if (virFileLinkPointsTo(path, drvdir)) {
+ dev->unbind_from_stub = 1;
+ dev->remove_slot = 1;
+ goto remove_id;
+ }
+
/* If the device is already bound to a driver, unbind it.
* Note, this will have rather unpleasant side effects if this
* PCI device happens to be IDE controller for the disk hosting
* your root filesystem.
*/
pciDeviceFile(path, sizeof(path), dev->name, "driver/unbind");
- if (virFileExists(path) && virFileWriteStr(path, dev->name, 0) < 0) {
- virReportSystemError(errno,
- _("Failed to unbind PCI device '%s'"),
dev->name);
- return -1;
+ if (virFileExists(path)) {
+ if (virFileWriteStr(path, dev->name, 0) < 0) {
+ virReportSystemError(errno,
+ _("Failed to unbind PCI device
'%s'"),
+ dev->name);
+ return -1;
+ }
+ dev->reprobe = reprobe;
}
/* If the device isn't already bound to pci-stub, try binding it now.
@@ -879,18 +913,23 @@ pciBindDeviceToStub(pciDevice *dev, const char *driver)
virReportSystemError(errno,
_("Failed to add slot for PCI device '%s'
to %s"),
dev->name, driver);
- return -1;
+ ret = -1;
+ goto remove_id;
}
+ dev->remove_slot = 1;
pciDriverFile(path, sizeof(path), driver, "bind");
if (virFileWriteStr(path, dev->name, 0) < 0) {
virReportSystemError(errno,
_("Failed to bind PCI device '%s' to
%s"),
dev->name, driver);
- return -1;
+ ret = -1;
+ goto remove_id;
}
+ dev->unbind_from_stub = 1;
}
+remove_id:
/* If 'remove_id' exists, remove the device id from pci-stub's dynamic
* ID table so that 'drivers_probe' works below.
*/
@@ -899,10 +938,21 @@ pciBindDeviceToStub(pciDevice *dev, const char *driver)
virReportSystemError(errno,
_("Failed to remove PCI ID '%s' from
%s"),
dev->id, driver);
- return -1;
+ ret = -1;
+
+ /* remove PCI ID from pci-stub failed, and we can not reprobe it */
+ if (dev->reprobe) {
+ VIR_WARN("Faile to remove PCI ID '%s' from %s, and the device
can"
+ "not be reprobed again.", dev->id, driver);
+ }
+ dev->reprobe = 0;
}
- return 0;
+ if (ret < 0) {
+ pciUnBindDeviceFromStub(dev, driver);
+ }
+
+ return ret;
}
int
@@ -930,6 +980,9 @@ pciUnBindDeviceFromStub(pciDevice *dev, const char *driver)
char drvdir[PATH_MAX];
char path[PATH_MAX];
+ if (!dev->unbind_from_stub)
+ goto remove_slot;
+
/* If the device is bound to stub, unbind it.
*/
pciDriverDir(drvdir, sizeof(drvdir), driver);
@@ -938,21 +991,36 @@ pciUnBindDeviceFromStub(pciDevice *dev, const char *driver)
pciDriverFile(path, sizeof(path), driver, "unbind");
if (virFileWriteStr(path, dev->name, 0) < 0) {
virReportSystemError(errno,
- _("Failed to bind PCI device '%s' to
%s"),
+ _("Failed to unbind PCI device '%s' from
%s"),
dev->name, driver);
+ /* do not do it again */
+ dev->unbind_from_stub = 0;
+ dev->remove_slot = 0;
+ dev->reprobe = 0;
return -1;
}
}
+ dev->unbind_from_stub = 0;
+
+remove_slot:
+ if (!dev->remove_slot)
+ goto reprobe;
/* Xen's pciback.ko wants you to use remove_slot on the specific device */
pciDriverFile(path, sizeof(path), driver, "remove_slot");
if (virFileExists(path) && virFileWriteStr(path, dev->name, 0) < 0) {
virReportSystemError(errno,
- _("Failed to remove slot for PCI device '%s' to
%s"),
+ _("Failed to remove slot for PCI device '%s'
from %s"),
dev->name, driver);
+ dev->remove_slot = 0;
+ dev->reprobe = 0;
return -1;
}
+ dev->remove_slot = 0;
+reprobe:
+ if (!dev->reprobe)
+ return 0;
/* Trigger a re-probe of the device is not in the stub's dynamic
* ID table. If the stub is available, but 'remove_id' isn't
@@ -965,9 +1033,11 @@ pciUnBindDeviceFromStub(pciDevice *dev, const char *driver)
virReportSystemError(errno,
_("Failed to trigger a re-probe for PCI device
'%s'"),
dev->name);
+ dev->reprobe = 0;
return -1;
}
}
+ dev->reprobe = 0;
return 0;
}
--
1.7.1