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PCI: vmd: Disable MSI remapping after suspend 

MSI remapping is disabled by VMD driver for Intel's Icelake and
newer systems in order to improve performance by setting
VMCONFIG_MSI_REMAP. By design VMCONFIG_MSI_REMAP register is cleared
by firmware during boot. The same register gets cleared when system
is put in S3 power state. VMD driver needs to set this register again
in order to avoid interrupt issues with devices behind VMD if MSI
remapping was disabled before.

Link: https://lore.kernel.org/r/20221109142652.450998-1-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: Francisco Munoz <francisco.munoz.ruiz@linux.intel.com>
This commit is contained in:
Nirmal Patel 2022-11-09 07:26:52 -07:00 committed by Lorenzo Pieralisi
parent 9abf2313ad
commit d899aa6684
1 changed files with 5 additions and 0 deletions
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5
drivers/pci/controller/vmd.c
View File

@ -980,6 +980,11 @@ static int vmd_resume(struct device *dev)
struct vmd_dev *vmd = pci_get_drvdata(pdev);
int err, i;
if (vmd->irq_domain)
vmd_set_msi_remapping(vmd, true);
else
vmd_set_msi_remapping(vmd, false);
for (i = 0; i < vmd->msix_count; i++) {
err = devm_request_irq(dev, vmd->irqs[i].virq,
vmd_irq, IRQF_NO_THREAD,