Messages in this thread Patch in this message | | | From | Ioana Ciornei <> | Subject | [PATCH v2 3/4] bus: fsl-mc: add root dprc rescan attribute | Date | Fri, 16 Nov 2018 17:55:41 +0000 |
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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> --- Changes in v2: - remove the rescan dev_attr on the remove path
Documentation/ABI/stable/sysfs-bus-fsl-mc | 9 ++++++++ MAINTAINERS | 1 + drivers/bus/fsl-mc/dprc-driver.c | 36 +++++++++++++++++++++++++++++++ 3 files changed, 46 insertions(+) create mode 100644 Documentation/ABI/stable/sysfs-bus-fsl-mc
diff --git a/Documentation/ABI/stable/sysfs-bus-fsl-mc b/Documentation/ABI/stable/sysfs-bus-fsl-mc new file mode 100644 index 0000000..9f3a95e --- /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 e841cc4..7b76a80 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12283,6 +12283,7 @@ F: drivers/bus/fsl-mc/ F: Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt 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 3919d9b..b3cde63 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; } -- 1.9.1
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