[PATCH v7 4/6] iommu/arm-smmu: Add the device_link between masters and smmu
From: Vivek Gautam <hidden>
Date: 2018-02-07 10:31:20
Also in:
dri-devel, linux-arm-msm, linux-iommu, linux-pm, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
From: Sricharan R <redacted> Finally add the device link between the master device and smmu, so that the smmu gets runtime enabled/disabled only when the master needs it. This is done from add_device callback which gets called once when the master is added to the smmu. Signed-off-by: Sricharan R <redacted> Signed-off-by: Vivek Gautam <redacted> --- drivers/iommu/arm-smmu.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index c024f69c1682..c7e924d553bd 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c@@ -215,6 +215,9 @@ struct arm_smmu_device { /* IOMMU core code handle */ struct iommu_device iommu; + + /* runtime PM link to master */ + struct device_link *link; }; enum arm_smmu_context_fmt {
@@ -1425,6 +1428,17 @@ static int arm_smmu_add_device(struct device *dev) pm_runtime_put_sync(smmu->dev); + /* + * Establish the link between smmu and master, so that the + * smmu gets runtime enabled/disabled as per the master's + * needs. + */ + smmu->link = device_link_add(dev, smmu->dev, DL_FLAG_PM_RUNTIME); + if (!smmu->link) + dev_warn(smmu->dev, + "Unable to create device link between %s and %s\n", + dev_name(smmu->dev), dev_name(dev)); + return 0; out_rpm_put:
@@ -1449,6 +1463,8 @@ static void arm_smmu_remove_device(struct device *dev) cfg = fwspec->iommu_priv; smmu = cfg->smmu; + device_link_del(smmu->link); + ret = pm_runtime_get_sync(smmu->dev); if (ret) return;
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