linux-kernel - [PATCH RFC v1 05/15] iommu/arm-smmu-v3: Set sync op from consumer driver of cd-lib

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Date:   Fri, 15 Jan 2021 17:43:32 +0530
From:   Vivek Gautam <vivek.gautam@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        virtualization@...ts.linux-foundation.org
Cc:     joro@...tes.org, will.deacon@....com, mst@...hat.com,
        robin.murphy@....com, jean-philippe@...aro.org,
        eric.auger@...hat.com, alex.williamson@...hat.com,
        kevin.tian@...el.com, jacob.jun.pan@...ux.intel.com,
        yi.l.liu@...el.com, lorenzo.pieralisi@....com,
        shameerali.kolothum.thodi@...wei.com, vivek.gautam@....com
Subject: [PATCH RFC v1 05/15] iommu/arm-smmu-v3: Set sync op from consumer driver of cd-lib

Te change allows different consumers of arm-smmu-v3-cd-lib to set
their respective sync op for pasid entries.

Signed-off-by: Vivek Gautam <vivek.gautam@....com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Will Deacon <will.deacon@....com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc: Eric Auger <eric.auger@...hat.com>
Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Kevin Tian <kevin.tian@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Liu Yi L <yi.l.liu@...el.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c | 1 -
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c        | 7 +++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
index ec37476c8d09..acaa09acecdd 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
@@ -265,7 +265,6 @@ struct iommu_vendor_psdtable_ops arm_cd_table_ops = {
 	.free	 = arm_smmu_free_cd_tables,
 	.prepare = arm_smmu_prepare_cd,
 	.write	 = arm_smmu_write_ctx_desc,
-	.sync	 = arm_smmu_sync_cd,
 };
 
 struct iommu_pasid_table *arm_smmu_register_cd_table(struct device *dev,
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 2f86c6ac42b6..0c644be22b4b 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1869,6 +1869,13 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
 	if (ret)
 		goto out_free_cd_tables;
 
+	/*
+	 * Strange to setup an op here?
+	 * cd-lib is the actual user of sync op, and therefore the platform
+	 * drivers should assign this sync/maintenance ops as per need.
+	 */
+	tbl->ops->sync = arm_smmu_sync_cd;
+
 	/*
 	 * Note that this will end up calling arm_smmu_sync_cd() before
 	 * the master has been added to the devices list for this domain.
-- 
2.17.1