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    Subject[PATCH v3 4/4] bus: fsl-mc: add bus rescan attribute
    Date
    Introduce the rescan attribute as a bus attribute to
    synchronize the fsl-mc bus objects and the MC firmware.

    To rescan the fsl-mc bus, e.g.,
    echo 1 > /sys/bus/fsl-mc/rescan

    Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
    ---
    Changes in v2:
    - added proper documentation in /Documentation/ABI/
    - updated the MAINTAINERS file
    Changes in v3:
    - no change

    Documentation/ABI/stable/sysfs-bus-fsl-mc | 7 +++++
    drivers/bus/fsl-mc/fsl-mc-bus.c | 48 +++++++++++++++++++++++++++++++
    2 files changed, 55 insertions(+)

    diff --git a/Documentation/ABI/stable/sysfs-bus-fsl-mc b/Documentation/ABI/stable/sysfs-bus-fsl-mc
    index e530e8c..0663fbd 100644
    --- a/Documentation/ABI/stable/sysfs-bus-fsl-mc
    +++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc
    @@ -4,3 +4,10 @@ KernelVersion: 4.16
    Contact: Ioana Ciornei <ioana.ciornei@nxp.com>
    Description: Root dprc rescan attribute
    Users: Userspace drivers and management tools
    +
    +What: /sys/bus/fsl-mc/rescan
    +Date: March. 2018
    +KernelVersion: 4.16
    +Contact: Ioana Ciornei <ioana.ciornei@nxp.com>
    +Description: Bus rescan attribute
    +Users: Userspace drivers and management tools
    diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
    index 9d02984..80010d1 100644
    --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
    +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
    @@ -172,11 +172,59 @@ static ssize_t rescan_store(struct device *dev,

    ATTRIBUTE_GROUPS(fsl_mc_dev);

    +static int scan_fsl_mc_bus(struct device *dev, void *data)
    +{
    + struct fsl_mc_device *root_mc_dev;
    + struct fsl_mc_bus *root_mc_bus;
    +
    + if (!fsl_mc_is_root_dprc(dev))
    + goto exit;
    +
    + root_mc_dev = to_fsl_mc_device(dev);
    + root_mc_bus = to_fsl_mc_bus(root_mc_dev);
    + mutex_lock(&root_mc_bus->scan_mutex);
    + dprc_scan_objects(root_mc_dev, NULL);
    + mutex_unlock(&root_mc_bus->scan_mutex);
    +
    +exit:
    + return 0;
    +}
    +
    +static ssize_t bus_rescan_store(struct bus_type *bus,
    + const char *buf, size_t count)
    +{
    + unsigned long val;
    +
    + if (kstrtoul(buf, 0, &val) < 0)
    + return -EINVAL;
    +
    + if (val)
    + bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
    +
    + return count;
    +}
    +static BUS_ATTR(rescan, 0220, NULL, bus_rescan_store);
    +
    +static struct attribute *fsl_mc_bus_attrs[] = {
    + &bus_attr_rescan.attr,
    + NULL,
    +};
    +
    +static const struct attribute_group fsl_mc_bus_group = {
    + .attrs = fsl_mc_bus_attrs,
    +};
    +
    +static const struct attribute_group *fsl_mc_bus_groups[] = {
    + &fsl_mc_bus_group,
    + NULL,
    +};
    +
    struct bus_type fsl_mc_bus_type = {
    .name = "fsl-mc",
    .match = fsl_mc_bus_match,
    .uevent = fsl_mc_bus_uevent,
    .dev_groups = fsl_mc_dev_groups,
    + .bus_groups = fsl_mc_bus_groups,
    };
    EXPORT_SYMBOL_GPL(fsl_mc_bus_type);

    --
    1.9.1
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