Commit d899aa66 authored by Nirmal Patel's avatar Nirmal Patel Committed by Lorenzo Pieralisi
Browse files

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: 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 avatarFrancisco Munoz <francisco.munoz.ruiz@linux.intel.com>
parent 9abf2313

drivers/pci/controller/vmd.c

+5 −0
Original line number Diff line number Diff line
@@ -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,