linux-kernel - [PATCH v3 01/16] iommu/arm-smmu: Allow client devices to select direct mapping

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Date:   Wed, 29 May 2019 14:54:37 -0600
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     freedreno@...ts.freedesktop.org
Cc:     jean-philippe.brucker@....com, linux-arm-msm@...r.kernel.org,
        hoegsberg@...gle.com, dianders@...omium.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 01/16] iommu/arm-smmu: Allow client devices to select direct mapping

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.

v3: use iommu_request_dm_for_dev() to set up a default identity domain
for a group, per Robin

Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
---

 drivers/iommu/arm-smmu.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 5e54cc0..7537639 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1235,6 +1235,35 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
 	return 0;
 }
 
+struct arm_smmu_client_match_data {
+	bool direct_mapping;
+};
+
+static const struct arm_smmu_client_match_data qcom_adreno = {
+	.direct_mapping = true,
+};
+
+static const struct arm_smmu_client_match_data qcom_mdss = {
+	.direct_mapping = true,
+};
+
+static const struct of_device_id arm_smmu_client_of_match[] = {
+	{ .compatible = "qcom,adreno", .data = &qcom_adreno },
+	{ .compatible = "qcom,mdp4", .data = &qcom_mdss },
+	{ .compatible = "qcom,mdss", .data = &qcom_mdss },
+	{ .compatible = "qcom,sdm845-mdss", .data = &qcom_mdss },
+	{},
+};
+
+static const struct arm_smmu_client_match_data *
+arm_smmu_client_data(struct device *dev)
+{
+	const struct of_device_id *match =
+		of_match_device(arm_smmu_client_of_match, dev);
+
+	return match ? match->data : NULL;
+}
+
 static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 {
 	int ret;
@@ -1450,6 +1479,7 @@ static int arm_smmu_add_device(struct device *dev)
 	struct arm_smmu_device *smmu;
 	struct arm_smmu_master_cfg *cfg;
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+	const struct arm_smmu_client_match_data *client;
 	int i, ret;
 
 	if (using_legacy_binding) {
@@ -1512,6 +1542,11 @@ static int arm_smmu_add_device(struct device *dev)
 	device_link_add(dev, smmu->dev,
 			DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER);
 
+	client = arm_smmu_client_data(dev);
+
+	if (client && client->direct_mapping)
+		iommu_request_dm_for_dev(dev);
+
 	return 0;
 
 out_cfg_free:
-- 
2.7.4