This is a note to let you know that I've just added the patch titled
PCI: vmd: Reset VMD config register between soft reboots
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-vmd-reset-vmd-config-register-between-soft-reboo.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 63361faa4c66c5593b7ef6a4004e83313d1f6a80
Author: Nirmal Patel <nirmal.patel@xxxxxxxxxxxxxxx>
Date: Fri Feb 24 13:28:11 2023 -0700
PCI: vmd: Reset VMD config register between soft reboots
[ Upstream commit b61cf04c49c3dfa70a0d6725d3eb40bf9b35cf71 ]
VMD driver can disable or enable MSI remapping by changing
VMCONFIG_MSI_REMAP register. This register needs to be set to the
default value during soft reboots. Drives failed to enumerate
when Windows boots after performing a soft reboot from Linux.
Windows doesn't support MSI remapping disable feature and stale
register value hinders Windows VMD driver initialization process.
Adding vmd_shutdown function to make sure to set the VMCONFIG
register to the default value.
Link: https://lore.kernel.org/r/20230224202811.644370-1-nirmal.patel@xxxxxxxxxxxxxxx
Fixes: ee81ee84f873 ("PCI: vmd: Disable MSI-X remapping when possible")
Signed-off-by: Nirmal Patel <nirmal.patel@xxxxxxxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx>
Reviewed-by: Jon Derrick <jonathan.derrick@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index 8dce71142e10f..f49001ba96c75 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -881,6 +881,13 @@ static void vmd_remove(struct pci_dev *dev)
vmd_remove_irq_domain(vmd);
}
+static void vmd_shutdown(struct pci_dev *dev)
+{
+ struct vmd_dev *vmd = pci_get_drvdata(dev);
+
+ vmd_remove_irq_domain(vmd);
+}
+
#ifdef CONFIG_PM_SLEEP
static int vmd_suspend(struct device *dev)
{
@@ -946,6 +953,7 @@ static struct pci_driver vmd_drv = {
.id_table = vmd_ids,
.probe = vmd_probe,
.remove = vmd_remove,
+ .shutdown = vmd_shutdown,
.driver = {
.pm = &vmd_dev_pm_ops,
},
