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Subject[PATCH v1 1/1] iommu/vt-d: Enable PRI only if the device enables PASID.
Date
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

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 <jacob.jun.pan@linux.intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
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
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