commit a222a7f0bb6c94c31cc9c755110593656f19de89
author David Woodhouse <David.Woodhouse@intel.com> Wed Oct 07 23:35:18 2015 +0100
committer David Woodhouse <David.Woodhouse@intel.com> Thu Oct 15 15:35:19 2015 +0100
tree 1609c5e92acbb8d1f3cbefda804a3e02fc013088
parent 1208225cf48fa3b170b6dfe7369f15c295260755

iommu/vt-d: Implement page request handling

Largely based on the driver-mode implementation by Jesse Barnes.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/iommu/intel-iommu.c

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 58ecd52..68d71f8 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1698,8 +1698,11 @@
 	free_context_table(iommu);
 
 #ifdef CONFIG_INTEL_IOMMU_SVM
-	if (pasid_enabled(iommu))
+	if (pasid_enabled(iommu)) {
+		if (ecap_prs(iommu->ecap))
+			intel_svm_finish_prq(iommu);
 		intel_svm_free_pasid_tables(iommu);
+	}
 #endif
 }
 
@@ -3243,6 +3246,13 @@
 
 		iommu_flush_write_buffer(iommu);
 
+#ifdef CONFIG_INTEL_IOMMU_SVM
+		if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) {
+			ret = intel_svm_enable_prq(iommu);
+			if (ret)
+				goto free_iommu;
+		}
+#endif
 		ret = dmar_set_interrupt(iommu);
 		if (ret)
 			goto free_iommu;
@@ -4187,6 +4197,14 @@
 
 	intel_iommu_init_qi(iommu);
 	iommu_flush_write_buffer(iommu);
+
+#ifdef CONFIG_INTEL_IOMMU_SVM
+	if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) {
+		ret = intel_svm_enable_prq(iommu);
+		if (ret)
+			goto disable_iommu;
+	}
+#endif
 	ret = dmar_set_interrupt(iommu);
 	if (ret)
 		goto disable_iommu;
@@ -4983,6 +5001,8 @@
 		ctx_lo |= CONTEXT_PASIDE;
 		if (iommu->pasid_state_table)
 			ctx_lo |= CONTEXT_DINVE;
+		if (info->pri_supported)
+			ctx_lo |= CONTEXT_PRS;
 		context[0].lo = ctx_lo;
 		wmb();
 		iommu->flush.flush_context(iommu, sdev->did, sdev->sid,