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From:   Jacob Pan <jacob.jun.pan@linux.intel.com>
To:     iommu@lists.linux-foundation.org,
        LKML <linux-kernel@vger.kernel.org>,
        Joerg Roedel <joro@8bytes.org>,
        "Lu Baolu" <baolu.lu@linux.intel.com>,
        David Woodhouse <dwmw2@infradead.org>
Cc:     "Tian, Kevin" <kevin.tian@intel.com>,
        Raj Ashok <ashok.raj@intel.com>, "Yi Liu" <yi.l.liu@intel.com>,
        Eric Auger <eric.auger@redhat.com>,
        "Mehta, Sohil" <sohil.mehta@intel.com>,
        Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH v3 4/8] iommu/vt-d: Avoid duplicated code for PASID setup
Date:   Tue, 19 Nov 2019 09:56:28 -0800
Message-Id: <1574186193-30457-5-git-send-email-jacob.jun.pan@linux.intel.com>
In-Reply-To: <1574186193-30457-1-git-send-email-jacob.jun.pan@linux.intel.com>
References: <1574186193-30457-1-git-send-email-jacob.jun.pan@linux.intel.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@linux.intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.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