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path: root/drivers/iommu/arm/arm-smmu/arm-smmu.c
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Diffstat (limited to 'drivers/iommu/arm/arm-smmu/arm-smmu.c')
-rw-r--r--drivers/iommu/arm/arm-smmu/arm-smmu.c32
1 files changed, 22 insertions, 10 deletions
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 719fbca1fe52..2ff7a72cf377 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1316,8 +1316,14 @@ static bool arm_smmu_capable(struct device *dev, enum iommu_cap cap)
switch (cap) {
case IOMMU_CAP_CACHE_COHERENCY:
- /* Assume that a coherent TCU implies coherent TBUs */
- return cfg->smmu->features & ARM_SMMU_FEAT_COHERENT_WALK;
+ /*
+ * It's overwhelmingly the case in practice that when the pagetable
+ * walk interface is connected to a coherent interconnect, all the
+ * translation interfaces are too. Furthermore if the device is
+ * natively coherent, then its translation interface must also be.
+ */
+ return cfg->smmu->features & ARM_SMMU_FEAT_COHERENT_WALK ||
+ device_get_dma_attr(dev) == DEV_DMA_COHERENT;
case IOMMU_CAP_NOEXEC:
return true;
default:
@@ -2185,19 +2191,16 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
return 0;
}
-static int arm_smmu_device_remove(struct platform_device *pdev)
+static void arm_smmu_device_shutdown(struct platform_device *pdev)
{
struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
if (!smmu)
- return -ENODEV;
+ return;
if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
dev_notice(&pdev->dev, "disabling translation\n");
- iommu_device_unregister(&smmu->iommu);
- iommu_device_sysfs_remove(&smmu->iommu);
-
arm_smmu_rpm_get(smmu);
/* Turn the thing off */
arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_sCR0, ARM_SMMU_sCR0_CLIENTPD);
@@ -2209,12 +2212,21 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
clk_bulk_disable(smmu->num_clks, smmu->clks);
clk_bulk_unprepare(smmu->num_clks, smmu->clks);
- return 0;
}
-static void arm_smmu_device_shutdown(struct platform_device *pdev)
+static int arm_smmu_device_remove(struct platform_device *pdev)
{
- arm_smmu_device_remove(pdev);
+ struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
+
+ if (!smmu)
+ return -ENODEV;
+
+ iommu_device_unregister(&smmu->iommu);
+ iommu_device_sysfs_remove(&smmu->iommu);
+
+ arm_smmu_device_shutdown(pdev);
+
+ return 0;
}
static int __maybe_unused arm_smmu_runtime_resume(struct device *dev)