linux-kernel - [PATCH 05/10] iommu/vt-d: Avoid duplicated code for PASID setup

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Message-Id: <1573859377-75924-6-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Fri, 15 Nov 2019 15:09:32 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>, "Yi Liu" <yi.l.liu@...el.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH 05/10] iommu/vt-d: Avoid duplicated code for PASID setup

After each setup for PASID entry, related translation caches must be flushed.
We can combine duplicated code into one function which is less error prone.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel-pasid.c | 48 +++++++++++++++++----------------------------
 1 file changed, 18 insertions(+), 30 deletions(-)

diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index e7cb0b8a7332..732bfee228df 100644
--- a/drivers/iommu/intel-pasid.c
+++ b/drivers/iommu/intel-pasid.c
@@ -465,6 +465,21 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
 		devtlb_invalidation_with_pasid(iommu, dev, pasid);
 }
 
+static void pasid_flush_caches(struct intel_iommu *iommu,
+				struct pasid_entry *pte,
+				int pasid, u16 did)
+{
+	if (!ecap_coherent(iommu->ecap))
+		clflush_cache_range(pte, sizeof(*pte));
+
+	if (cap_caching_mode(iommu->cap)) {
+		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
+		iotlb_invalidation_with_pasid(iommu, did, pasid);
+	} else {
+		iommu_flush_write_buffer(iommu);
+	}
+}
+
 /*
  * Set up the scalable mode pasid table entry for first only
  * translation type.
@@ -518,16 +533,7 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu,
 	/* Setup Present and PASID Granular Transfer Type: */
 	pasid_set_translation_type(pte, 1);
 	pasid_set_present(pte);
-
-	if (!ecap_coherent(iommu->ecap))
-		clflush_cache_range(pte, sizeof(*pte));
-
-	if (cap_caching_mode(iommu->cap)) {
-		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
-		iotlb_invalidation_with_pasid(iommu, did, pasid);
-	} else {
-		iommu_flush_write_buffer(iommu);
-	}
+	pasid_flush_caches(iommu, pte, pasid, did);
 
 	return 0;
 }
@@ -591,16 +597,7 @@ int intel_pasid_setup_second_level(struct intel_iommu *iommu,
 	 */
 	pasid_set_sre(pte);
 	pasid_set_present(pte);
-
-	if (!ecap_coherent(iommu->ecap))
-		clflush_cache_range(pte, sizeof(*pte));
-
-	if (cap_caching_mode(iommu->cap)) {
-		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
-		iotlb_invalidation_with_pasid(iommu, did, pasid);
-	} else {
-		iommu_flush_write_buffer(iommu);
-	}
+	pasid_flush_caches(iommu, pte, pasid, did);
 
 	return 0;
 }
@@ -634,16 +631,7 @@ int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
 	 */
 	pasid_set_sre(pte);
 	pasid_set_present(pte);
-
-	if (!ecap_coherent(iommu->ecap))
-		clflush_cache_range(pte, sizeof(*pte));
-
-	if (cap_caching_mode(iommu->cap)) {
-		pasid_cache_invalidation_with_pasid(iommu, did, pasid);
-		iotlb_invalidation_with_pasid(iommu, did, pasid);
-	} else {
-		iommu_flush_write_buffer(iommu);
-	}
+	pasid_flush_caches(iommu, pte, pasid, did);
 
 	return 0;
 }
-- 
2.7.4