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Force FLR on for buggy SR-IOV devices.

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Some buggy PCI devices actually support FLR, but
forget to advertise that fact in their PCI config space.
However, Virtual Functions on SR-IOV devices are
*required* to support FLR by the spec, so force has_flr
on if this is a virtual function.

Signed-off-by: Chris Lalancette <clalance@redhat.com>
This commit is contained in:
Chris Lalancette 2010-07-23 15:03:29 -04:00
parent 4018a026b2
commit 71e92a1575
1 changed files with 44 additions and 4 deletions
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48
src/util/pci.c
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@ -182,6 +182,16 @@ pciOpenConfig(pciDevice *dev)
return 0;
}
static void
pciCloseConfig(pciDevice *dev)
{
if (!dev)
return;
if (dev->fd >= 0)
close(dev->fd);
}
static int
pciRead(pciDevice *dev, unsigned pos, uint8_t *buf, unsigned buflen)
{
@ -379,11 +389,16 @@ pciFindExtendedCapabilityOffset(pciDevice *dev, unsigned capability)
return 0;
}
static unsigned
/* detects whether this device has FLR. Returns 0 if the device does
* not have FLR, 1 if it does, and -1 on error
*/
static int
pciDetectFunctionLevelReset(pciDevice *dev)
{
uint32_t caps;
uint8_t pos;
char *path;
int found;
/* The PCIe Function Level Reset capability allows
* individual device functions to be reset without
@ -412,6 +427,25 @@ pciDetectFunctionLevelReset(pciDevice *dev)
}
}
/* there are some buggy devices that do support FLR, but forget to
* advertise that fact in their capabilities. However, FLR is *required*
* to be present for virtual functions (VFs), so if we see that this
* device is a VF, we just assume FLR works
*/
if (virAsprintf(&path, PCI_SYSFS "devices/%s/physfn", dev->name) < 0) {
virReportOOMError();
return -1;
}
found = virFileExists(path);
VIR_FREE(path);
if (found) {
VIR_DEBUG("%s %s: buggy device didn't advertise FLR, but is a VF; forcing flr on",
dev->id, dev->name);
return 1;
}
VIR_DEBUG("%s %s: no FLR capability found", dev->id, dev->name);
return 0;
@ -626,6 +660,8 @@ pciTryPowerManagementReset(pciDevice *dev)
static int
pciInitDevice(pciDevice *dev)
{
int flr;
if (pciOpenConfig(dev) < 0) {
virReportSystemError(errno,
_("Failed to open config space file '%s'"),
@ -635,7 +671,12 @@ pciInitDevice(pciDevice *dev)
dev->pcie_cap_pos = pciFindCapabilityOffset(dev, PCI_CAP_ID_EXP);
dev->pci_pm_cap_pos = pciFindCapabilityOffset(dev, PCI_CAP_ID_PM);
dev->has_flr = pciDetectFunctionLevelReset(dev);
flr = pciDetectFunctionLevelReset(dev);
if (flr < 0) {
pciCloseConfig(dev);
return flr;
}
dev->has_flr = flr;
dev->has_pm_reset = pciDetectPowerManagementReset(dev);
dev->initted = 1;
return 0;
@ -1099,8 +1140,7 @@ pciFreeDevice(pciDevice *dev)
if (!dev)
return;
VIR_DEBUG("%s %s: freeing", dev->id, dev->name);
if (dev->fd >= 0)
close(dev->fd);
pciCloseConfig(dev);
VIR_FREE(dev);
}