Messages in this thread Patch in this message |  | | From | Ioana Ciornei <> | Subject | [PATCH v3 4/4] bus: fsl-mc: add bus rescan attribute | Date | Fri, 23 Mar 2018 10:38:58 -0500 |
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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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