linux-kernel - [PATCH 5/5] iommu/arm-smmu: Hook up map

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Date:   Fri,  8 Jan 2021 17:50:31 -0800
From:   "Isaac J. Manjarres" <isaacm@...eaurora.org>
To:     will@...nel.org, robin.murphy@....com, joro@...tes.org
Cc:     "Isaac J. Manjarres" <isaacm@...eaurora.org>, pdaly@...eaurora.org,
        pratikp@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] iommu/arm-smmu: Hook up map_sg()

Now that everything is in place for iommu_map_sg() to defer
mapping a scatter-gather list to the io-pgtable layer, implement
the map_sg() callback in the SMMU driver, so that iommu_map_sg()
can invoke it with the entire scatter-gather list that will be
mapped.

Signed-off-by: Isaac J. Manjarres <isaacm@...eaurora.org>
---
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index d8c6bfd..52acc68 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1208,6 +1208,24 @@ static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
 	return ret;
 }
 
+static int arm_smmu_map_sg(struct iommu_domain *domain, unsigned long iova,
+			   struct scatterlist *sg, unsigned int nents, int prot,
+			   gfp_t gfp, size_t *mapped)
+{
+	struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops;
+	struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu;
+	int ret;
+
+	if (!ops)
+		return -ENODEV;
+
+	arm_smmu_rpm_get(smmu);
+	ret = ops->map_sg(ops, iova, sg, nents, prot, gfp, mapped);
+	arm_smmu_rpm_put(smmu);
+
+	return ret;
+}
+
 static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
 			     size_t size, struct iommu_iotlb_gather *gather)
 {
@@ -1624,6 +1642,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.domain_free		= arm_smmu_domain_free,
 	.attach_dev		= arm_smmu_attach_dev,
 	.map			= arm_smmu_map,
+	.map_sg			= arm_smmu_map_sg,
 	.unmap			= arm_smmu_unmap,
 	.flush_iotlb_all	= arm_smmu_flush_iotlb_all,
 	.iotlb_sync		= arm_smmu_iotlb_sync,
-- 
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