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

From: Nate Watterson
Date: Thu Jun 29 2017 - 18:23:08 EST


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

Signed-off-by: Nate Watterson <nwatters@xxxxxxxxxxxxxx>
---
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);

--
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Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux
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