Messages in this thread Patch in this message |  | | From | Ioana Ciornei <> | Subject | [PATCH v3 3/4] bus: fsl-mc: add root dprc rescan attribute | Date | Fri, 23 Mar 2018 10:38:57 -0500 |
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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: - added proper documentation in /Documentation/ABI/ - updated the MAINTAINERS file Changes in v3: - no change
Documentation/ABI/stable/sysfs-bus-fsl-mc | 6 ++++++ MAINTAINERS | 1 + drivers/bus/fsl-mc/dprc-driver.c | 4 ++-- drivers/bus/fsl-mc/fsl-mc-bus.c | 28 ++++++++++++++++++++++++++++ drivers/bus/fsl-mc/fsl-mc-private.h | 3 +++ 5 files changed, 40 insertions(+), 2 deletions(-) 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..e530e8c --- /dev/null +++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc @@ -0,0 +1,6 @@ +What: /sys/bus/fsl-mc/devices/dprc.*/rescan +Date: March. 2018 +KernelVersion: 4.16 +Contact: Ioana Ciornei <ioana.ciornei@nxp.com> +Description: Root dprc rescan attribute +Users: Userspace drivers and management tools diff --git a/MAINTAINERS b/MAINTAINERS index 861cf1d..e179dc6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11486,6 +11486,7 @@ 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 52c7e15..be80e3a 100644 --- a/drivers/bus/fsl-mc/dprc-driver.c +++ b/drivers/bus/fsl-mc/dprc-driver.c @@ -214,8 +214,8 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev, * populated before they can get allocation requests from probe callbacks * of the device drivers for the non-allocatable devices. */ -static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev, - unsigned int *total_irq_count) +int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev, + unsigned int *total_irq_count) { int num_child_objects; int dprc_get_obj_failures; diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c index 0ade415..9d02984 100644 --- a/drivers/bus/fsl-mc/fsl-mc-bus.c +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c @@ -137,8 +137,36 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(modalias); +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); + static struct attribute *fsl_mc_dev_attrs[] = { &dev_attr_modalias.attr, + &dev_attr_rescan.attr, NULL, }; diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h index 00cca7d..c1fc80e 100644 --- a/drivers/bus/fsl-mc/fsl-mc-private.h +++ b/drivers/bus/fsl-mc/fsl-mc-private.h @@ -545,6 +545,9 @@ int __must_check fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc, void dprc_driver_exit(void); +int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev, + unsigned int *total_irq_count); + int __init fsl_mc_allocator_driver_init(void); void fsl_mc_allocator_driver_exit(void); -- 1.9.1
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