[PATCH 7/8] iommu/arm-smmu: Support stream_mapping_reset implementation detail

[kholk11]

From: AngeloGioacchino Del Regno <kholk11@xxxxxxxxx>

Some IOMMUs may be in need of overriding the stream mapping reset
function and this is seen on at least some Qualcomm SoCs:
add a stream_mapping_reset function to the implementation details
and call it in the appropriate function.

Signed-off-by: AngeloGioacchino Del Regno <kholk11@xxxxxxxxx>
---
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 5 +++++
 drivers/iommu/arm/arm-smmu/arm-smmu.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 8c070c493315..44571873f148 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1656,6 +1656,11 @@ static void arm_smmu_stream_mapping_reset(struct arm_smmu_device *smmu)
 {
 	int i;
 
+	if (smmu->impl && smmu->impl->stream_mapping_reset) {
+		smmu->impl->stream_mapping_reset(smmu);
+		return;
+	}
+
 	/*
 	 * Reset stream mapping groups: Initial values mark all SMRn as
 	 * invalid and all S2CRn as bypass unless overridden.
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
index 2cd3d126f675..9c045594b8cf 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
@@ -387,6 +387,7 @@ struct arm_smmu_impl {
 	int (*cfg_probe)(struct arm_smmu_device *smmu);
 	int (*reset)(struct arm_smmu_device *smmu);
 	int (*init_context)(struct arm_smmu_domain *smmu_domain);
+	void (*stream_mapping_reset)(struct arm_smmu_device *smmu);
 	void (*test_smr_masks)(struct arm_smmu_device *smmu);
 	void (*tlb_sync)(struct arm_smmu_device *smmu, int page, int sync,
 			 int status);
-- 
2.28.0