[PATCH 5.15 194/532] PCI: vmd: Reset VMD config register between soft reboots

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From: Nirmal Patel <nirmal.patel@xxxxxxxxxxxxxxx>

[ 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>
---
 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,
 	},
-- 
2.39.2






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