From: Nirmal Patel nirmal.patel@linux.intel.com
[ 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@linux.intel.c... Fixes: ee81ee84f873 ("PCI: vmd: Disable MSI-X remapping when possible") Signed-off-by: Nirmal Patel nirmal.patel@linux.intel.com Signed-off-by: Lorenzo Pieralisi lpieralisi@kernel.org Reviewed-by: Jon Derrick jonathan.derrick@linux.dev Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/vmd.c | 8 ++++++++ 1 file changed, 8 insertions(+)
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, },