| Message ID | 1426526415-13299-2-git-send-email-mst@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Mon, Mar 16, 2015 at 06:20:27PM +0100, Michael S. Tsirkin wrote: > commit d52877c7b1afb8c37ebe17e2005040b79cb618b0 > pci/irq: let pci_device_shutdown to call pci_msi_shutdown v2 > > attempted to address the problem of kexec getting > started after linux enabled msi/msix for a device, > and drivers being confused by msi being enabled, > by disabling msi at shutdown. > > But arguably, it's better to disable msi/msix when kexec > starts - for example, kexec might run after a crash (kdump) > and shutdown callbacks are not always invoked in that case. > > Cc: Yinghai Lu <yhlu.kernel.send@gmail.com> > Cc: Ulrich Obergfell <uobergfe@redhat.com> > Cc: Fam Zheng <famz@redhat.com> > Cc: Rusty Russell <rusty@rustcorp.com.au> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com> > --- > drivers/pci/pci-driver.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c > index 3cb2210..dac6d47 100644 > --- a/drivers/pci/pci-driver.c > +++ b/drivers/pci/pci-driver.c > @@ -305,6 +305,12 @@ static long local_pci_probe(void *_ddi) > */ > pm_runtime_get_sync(dev); > pci_dev->driver = pci_drv; > + /* > + * When using kexec, msi might be left enabled by the previous kernel, > + * this breaks things as some drivers assume msi/msi-x is off at boot. > + * Fix this by forcing msi off at startup. > + */ > + pci_msi_off(dev); should be pci_msi_off(pci_dev); obviously. Which likely means I pushed a wrong tree to the test machine again, so this wasn't tested as I thought it is :( I'll re-test and repost day after tomorrow, Fam, can you tweak this manually when you are testing? I don't want to spam the list. > rc = pci_drv->probe(pci_dev, ddi->id); > if (!rc) > return rc; > -- > MST > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 3cb2210..dac6d47 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -305,6 +305,12 @@ static long local_pci_probe(void *_ddi) */ pm_runtime_get_sync(dev); pci_dev->driver = pci_drv; + /* + * When using kexec, msi might be left enabled by the previous kernel, + * this breaks things as some drivers assume msi/msi-x is off at boot. + * Fix this by forcing msi off at startup. + */ + pci_msi_off(dev); rc = pci_drv->probe(pci_dev, ddi->id); if (!rc) return rc;
commit d52877c7b1afb8c37ebe17e2005040b79cb618b0 pci/irq: let pci_device_shutdown to call pci_msi_shutdown v2 attempted to address the problem of kexec getting started after linux enabled msi/msix for a device, and drivers being confused by msi being enabled, by disabling msi at shutdown. But arguably, it's better to disable msi/msix when kexec starts - for example, kexec might run after a crash (kdump) and shutdown callbacks are not always invoked in that case. Cc: Yinghai Lu <yhlu.kernel.send@gmail.com> Cc: Ulrich Obergfell <uobergfe@redhat.com> Cc: Fam Zheng <famz@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- drivers/pci/pci-driver.c | 6 ++++++ 1 file changed, 6 insertions(+)