From: Kuppuswamy Sathyanarayanan <[email protected]>
Intel IOMMU Page Request Services (PRS) only works with devices which supports/uses PASID. So enable PRI only if the device also enables PASID support. For more details, Please check the implementation of PRQ handler(prq_event_thread()) in intel-svm driver. Cc: Jacob Pan <[email protected]> Cc: Ashok Raj <[email protected]> Signed-off-by: Kuppuswamy Sathyanarayanan <[email protected]> --- drivers/iommu/intel-iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 1457f931218e..ef1a646e0993 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1402,7 +1402,8 @@ static void iommu_enable_dev_iotlb(struct device_domain_info *info) if (info->pasid_supported && !pci_enable_pasid(pdev, info->pasid_supported & ~1)) info->pasid_enabled = 1; - if (info->pri_supported && !pci_reset_pri(pdev) && !pci_enable_pri(pdev, 32)) + if (info->pri_supported && info->pasid_enabled && + !pci_reset_pri(pdev) && !pci_enable_pri(pdev, 32)) info->pri_enabled = 1; #endif if (!pdev->untrusted && info->ats_supported && -- 2.20.1
