Commit b61cf04c authored by Nirmal Patel's avatar Nirmal Patel Committed by Lorenzo Pieralisi
Browse files

PCI: vmd: Reset VMD config register between soft reboots 

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.com


Fixes: ee81ee84 ("PCI: vmd: Disable MSI-X remapping when possible")
Signed-off-by: default avatarNirmal Patel <nirmal.patel@linux.intel.com>
Signed-off-by: default avatarLorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: default avatarJon Derrick <jonathan.derrick@linux.dev>
parent ac9a7868

drivers/pci/controller/vmd.c

+8 −0
Original line number Diff line number Diff line
@@ -1036,6 +1036,13 @@ static void vmd_remove(struct pci_dev *dev) 
	ida_simple_remove(&vmd_instance_ida, vmd->instance);

}



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)

{
@@ -1101,6 +1108,7 @@ 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,

	},