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    Subject[PATCH v8 4/5] iommu/arm-smmu: Add the device_link between masters and smmu
    Date
    From: Sricharan R <sricharan@codeaurora.org>

    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 <sricharan@codeaurora.org>
    Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
    ---
    drivers/iommu/arm-smmu.c | 21 +++++++++++++++++++++
    1 file changed, 21 insertions(+)

    diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
    index 3d6a1875431f..bb1ea82c1003 100644
    --- a/drivers/iommu/arm-smmu.c
    +++ b/drivers/iommu/arm-smmu.c
    @@ -217,6 +217,9 @@ 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 {
    @@ -1470,10 +1473,26 @@ static int arm_smmu_add_device(struct device *dev)

    iommu_device_link(&smmu->iommu, 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));
    + ret = -ENODEV;
    + goto out_unlink;
    + }
    +
    arm_smmu_rpm_put(smmu);

    return 0;

    +out_unlink:
    + iommu_device_unlink(&smmu->iommu, dev);
    + arm_smmu_master_free_smes(fwspec);
    out_rpm_put:
    arm_smmu_rpm_put(smmu);
    out_cfg_free:
    @@ -1496,6 +1515,8 @@ static void arm_smmu_remove_device(struct device *dev)
    cfg = fwspec->iommu_priv;
    smmu = cfg->smmu;

    + device_link_del(smmu->link);
    +
    ret = arm_smmu_rpm_get(smmu);
    if (ret < 0)
    return;
    --
    QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
    of Code Aurora Forum, hosted by The Linux Foundation
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