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PCI: vmd: Reset VMD config register between soft reboots

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[ 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.com
Fixes: ee81ee84f8 ("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>
This commit is contained in:
Nirmal Patel 2023-02-24 13:28:11 -07:00 committed by Greg Kroah-Hartman
parent ebafa12c8f
commit c52502b674
1 changed files with 8 additions and 0 deletions
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8
drivers/pci/controller/vmd.c
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@ -979,6 +979,13 @@ static void vmd_remove(struct pci_dev *dev)
ida_simple_remove(&vmd_instance_ida, vmd->instance); 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 #ifdef CONFIG_PM_SLEEP
static int vmd_suspend(struct device *dev) static int vmd_suspend(struct device *dev)
{ {
@ -1056,6 +1063,7 @@ static struct pci_driver vmd_drv = {
.id_table = vmd_ids, .id_table = vmd_ids,
.probe = vmd_probe, .probe = vmd_probe,
.remove = vmd_remove, .remove = vmd_remove,
.shutdown = vmd_shutdown,
.driver = { .driver = {
.pm = &vmd_dev_pm_ops, .pm = &vmd_dev_pm_ops,
}, },