linux-kernel - [PATCH v2] iommu/arm-smmu-v3: Implement shutdown method

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Message-Id: <1498774696-16037-1-git-send-email-nwatters@codeaurora.org>
Date:   Thu, 29 Jun 2017 18:18:15 -0400
From:   Nate Watterson <nwatters@...eaurora.org>
To:     Will Deacon <will.deacon@....com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc:     Nate Watterson <nwatters@...eaurora.org>
Subject: [PATCH v2] iommu/arm-smmu-v3: Implement shutdown method

The shutdown method disables the SMMU to avoid corrupting a new kernel
started with kexec.

Signed-off-by: Nate Watterson <nwatters@...eaurora.org>
---
 drivers/iommu/arm-smmu-v3.c | 7 +++++++
 drivers/iommu/arm-smmu.c    | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 380969a..3d8ac29 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2765,9 +2765,15 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
 	struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
 
 	arm_smmu_device_disable(smmu);
+
 	return 0;
 }
 
+static void arm_smmu_device_shutdown(struct platform_device *pdev)
+{
+	arm_smmu_device_remove(pdev);
+}
+
 static struct of_device_id arm_smmu_of_match[] = {
 	{ .compatible = "arm,smmu-v3", },
 	{ },
@@ -2781,6 +2787,7 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
 	},
 	.probe	= arm_smmu_device_probe,
 	.remove	= arm_smmu_device_remove,
+	.shutdown = arm_smmu_device_shutdown,
 };
 module_platform_driver(arm_smmu_driver);
 
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 7ec30b0..af50bab 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -2319,6 +2319,11 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void arm_smmu_device_shutdown(struct platform_device *pdev)
+{
+	arm_smmu_device_remove(pdev);
+}
+
 static struct platform_driver arm_smmu_driver = {
 	.driver	= {
 		.name		= "arm-smmu",
@@ -2326,6 +2331,7 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
 	},
 	.probe	= arm_smmu_device_probe,
 	.remove	= arm_smmu_device_remove,
+	.shutdown = arm_smmu_device_shutdown,
 };
 module_platform_driver(arm_smmu_driver);
 
-- 
Qualcomm Datacenter Technologies, Inc. on behalf of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux
Foundation Collaborative Project.