diff options
| author | Ioana Ciornei <ioana.ciornei@nxp.com> | 2018-03-05 18:37:32 +0200 |
|---|---|---|
| committer | Dong Aisheng <aisheng.dong@nxp.com> | 2019-12-02 18:03:39 +0800 |
| commit | 959a22bedb8bea874bd5794a1463ce70104eaf91 (patch) | |
| tree | 45ba14c1e4c0792f7e147827be36b26e068bc224 | |
| parent | 672699a3894f55caefda68b0b95a6c0dfa26b39c (diff) | |
bus: fsl-mc: add root dprc rescan attribute
Introduce the rescan attribute as a device attribute to
synchronize the fsl-mc bus objects and the MC firmware.
To rescan the root dprc only, e.g.
echo 1 > /sys/bus/fsl-mc/devices/dprc.1/rescan
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
| -rw-r--r-- | Documentation/ABI/stable/sysfs-bus-fsl-mc | 9 | ||||
| -rw-r--r-- | MAINTAINERS | 1 | ||||
| -rw-r--r-- | drivers/bus/fsl-mc/dprc-driver.c | 36 |
3 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-bus-fsl-mc b/Documentation/ABI/stable/sysfs-bus-fsl-mc new file mode 100644 index 000000000000..9f3a95e4b92a --- /dev/null +++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc @@ -0,0 +1,9 @@ +What: /sys/bus/fsl-mc/devices/dprc.*/rescan +Date: November 2018 +KernelVersion: 5.0 +Contact: Ioana Ciornei <ioana.ciornei@nxp.com> +Description: Writing a non-zero value to this attribute will + force a rescan of dprc.X container in the system and + synchronize the objects under dprc.X and the + Management Complex firmware. +Users: Userspace drivers and management tools diff --git a/MAINTAINERS b/MAINTAINERS index ecf89209441c..6530b23e2ce4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13448,6 +13448,7 @@ F: Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt F: Documentation/networking/device_drivers/freescale/dpaa2/overview.rst F: Documentation/networking/dpaa2/overview.rst F: include/uapi/linux/fsl_mc.h +F: Documentation/ABI/stable/sysfs-bus-fsl-mc QT1010 MEDIA DRIVER M: Antti Palosaari <crope@iki.fi> diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c index bab0d5a65b42..2f94aba98c29 100644 --- a/drivers/bus/fsl-mc/dprc-driver.c +++ b/drivers/bus/fsl-mc/dprc-driver.c @@ -354,6 +354,33 @@ static int dprc_scan_container(struct fsl_mc_device *mc_bus_dev) return 0; } +static ssize_t rescan_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fsl_mc_device *root_mc_dev; + struct fsl_mc_bus *root_mc_bus; + unsigned long val; + + if (!fsl_mc_is_root_dprc(dev)) + return -EINVAL; + + root_mc_dev = to_fsl_mc_device(dev); + root_mc_bus = to_fsl_mc_bus(root_mc_dev); + + if (kstrtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (val) { + mutex_lock(&root_mc_bus->scan_mutex); + dprc_scan_objects(root_mc_dev, NULL); + mutex_unlock(&root_mc_bus->scan_mutex); + } + + return count; +} +static DEVICE_ATTR_WO(rescan); + /** * dprc_irq0_handler - Regular ISR for DPRC interrupt 0 * @@ -692,6 +719,13 @@ static int dprc_probe(struct fsl_mc_device *mc_dev) mutex_init(&mc_bus->scan_mutex); + error = device_create_file(&mc_dev->dev, &dev_attr_rescan); + if (error < 0) { + dev_err(&mc_dev->dev, "device_create_file() failed: %d\n", + error); + goto error_cleanup_open; + } + /* * Discover MC objects in DPRC object: */ @@ -788,6 +822,8 @@ static int dprc_remove(struct fsl_mc_device *mc_dev) fsl_mc_uapi_remove_device_file(mc_bus); } + device_remove_file(&mc_dev->dev, &dev_attr_rescan); + dev_info(&mc_dev->dev, "DPRC device unbound from driver"); return 0; } |