From: Jordan Crouse <jcrouse@codeaurora.org>
Date: Tue, 21 Apr 2020 00:03:51 +0530
Subject: iommu/arm-smmu: Allow client devices to select direct mapping
Git-commit: 0e764a01015dfebff8a8ffd297d74663772e248a
Patch-mainline: v5.8-rc1
References: bsc#1175713
Some client devices want to directly map the IOMMU themselves instead
of using the DMA domain. Allow those devices to opt in to direct
mapping by way of a list of compatible strings.
Co-developed-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/7cf1f64167b5545b7f42275395be1f1e2ea3a6ac.1587407458.git.saiprakash.ranjan@codeaurora.org
Signed-off-by: Will Deacon <will@kernel.org>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/arm-smmu-qcom.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/iommu/arm-smmu-qcom.c b/drivers/iommu/arm-smmu-qcom.c
index 64a4ab270ab7..5bedf21587a5 100644
--- a/drivers/iommu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm-smmu-qcom.c
@@ -3,6 +3,7 @@
* Copyright (c) 2019, The Linux Foundation. All rights reserved.
*/
+#include <linux/of_device.h>
#include <linux/qcom_scm.h>
#include "arm-smmu.h"
@@ -11,6 +12,23 @@ struct qcom_smmu {
struct arm_smmu_device smmu;
};
+static const struct of_device_id qcom_smmu_client_of_match[] = {
+ { .compatible = "qcom,adreno" },
+ { .compatible = "qcom,mdp4" },
+ { .compatible = "qcom,mdss" },
+ { .compatible = "qcom,sc7180-mdss" },
+ { .compatible = "qcom,sdm845-mdss" },
+ { }
+};
+
+static int qcom_smmu_def_domain_type(struct device *dev)
+{
+ const struct of_device_id *match =
+ of_match_device(qcom_smmu_client_of_match, dev);
+
+ return match ? IOMMU_DOMAIN_IDENTITY : 0;
+}
+
static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu)
{
int ret;
@@ -41,6 +59,7 @@ static int qcom_smmu500_reset(struct arm_smmu_device *smmu)
}
static const struct arm_smmu_impl qcom_smmu_impl = {
+ .def_domain_type = qcom_smmu_def_domain_type,
.reset = qcom_smmu500_reset,
};