linux-kernel - [PATCH v3 6/8] iommu/arm-smmu: Add impl hook for inherit boot mappings

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Message-Id: <20200904155513.282067-7-bjorn.andersson@linaro.org>
Date:   Fri,  4 Sep 2020 15:55:11 +0000
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Rob Clark <robdclark@...omium.org>
Cc:     Sibi Sankar <sibis@...eaurora.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: [PATCH v3 6/8] iommu/arm-smmu: Add impl hook for inherit boot mappings

Add a new operation to allow platform implementations to inherit any
stream mappings from the boot loader.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---

Changes since v2:
- New patch/interface

 drivers/iommu/arm/arm-smmu/arm-smmu.c | 11 ++++++-----
 drivers/iommu/arm/arm-smmu/arm-smmu.h |  6 ++++++
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index eb5c6ca5c138..4c4d302cd747 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -85,11 +85,6 @@ static inline void arm_smmu_rpm_put(struct arm_smmu_device *smmu)
 		pm_runtime_put_autosuspend(smmu->dev);
 }
 
-static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
-{
-	return container_of(dom, struct arm_smmu_domain, domain);
-}
-
 static struct platform_driver arm_smmu_driver;
 static struct iommu_ops arm_smmu_ops;
 
@@ -2188,6 +2183,12 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	if (err)
 		return err;
 
+	if (smmu->impl->inherit_mappings) {
+		err = smmu->impl->inherit_mappings(smmu);
+		if (err)
+			return err;
+	}
+
 	if (smmu->version == ARM_SMMU_V2) {
 		if (smmu->num_context_banks > smmu->num_context_irqs) {
 			dev_err(dev,
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
index 235d9a3a6ab6..f58164976e74 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
@@ -378,6 +378,11 @@ struct arm_smmu_domain {
 	struct iommu_domain		domain;
 };
 
+static inline struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
+{
+	return container_of(dom, struct arm_smmu_domain, domain);
+}
+
 struct arm_smmu_master_cfg {
 	struct arm_smmu_device		*smmu;
 	s16				smendx[];
@@ -442,6 +447,7 @@ struct arm_smmu_impl {
 	int (*alloc_context_bank)(struct arm_smmu_domain *smmu_domain,
 				  struct arm_smmu_device *smmu,
 				  struct device *dev, int start);
+	int (*inherit_mappings)(struct arm_smmu_device *smmu);
 };
 
 #define INVALID_SMENDX			-1
-- 
2.28.0