From: Ioana Ciornei <[email protected]> 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 <[email protected]> --- Documentation/ABI/stable/sysfs-bus-fsl-mc | 9 +++++ MAINTAINERS | 1 + drivers/bus/fsl-mc/dprc-driver.c | 4 +-- drivers/bus/fsl-mc/fsl-mc-bus.c | 41 +++++++++++++++++++++++ drivers/bus/fsl-mc/fsl-mc-private.h | 3 ++ 5 files changed, 56 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 000000000000..a4d384df9ba8 --- /dev/null +++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc @@ -0,0 +1,9 @@ +What: /sys/bus/fsl-mc/rescan +Date: January 2021 +KernelVersion: 5.12 +Contact: Ioana Ciornei <[email protected]> +Description: Writing a non-zero value to this attribute will + force a rescan of fsl-mc bus in the system and + synchronize the objects under fsl-mc bus and the + Management Complex firmware. +Users: Userspace drivers and management tools diff --git a/MAINTAINERS b/MAINTAINERS index 13b589396b61..66e90e326f6c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14651,6 +14651,7 @@ M: Stuart Yoder <[email protected]> M: Laurentiu Tudor <[email protected]> L: [email protected] S: Maintained +F: Documentation/ABI/stable/sysfs-bus-fsl-mc F: Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt F: Documentation/networking/device_drivers/ethernet/freescale/dpaa2/overview.rst F: drivers/bus/fsl-mc/ diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c index ccec375095f2..4adb6f318884 100644 --- a/drivers/bus/fsl-mc/dprc-driver.c +++ b/drivers/bus/fsl-mc/dprc-driver.c @@ -237,8 +237,8 @@ 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, - bool alloc_interrupts) +int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev, + bool alloc_interrupts) { 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 8af978bd0000..77708eaf2700 100644 --- a/drivers/bus/fsl-mc/fsl-mc-bus.c +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c @@ -208,12 +208,53 @@ static struct attribute *fsl_mc_dev_attrs[] = { 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 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_WO(rescan); + +static struct attribute *fsl_mc_bus_attrs[] = { + &bus_attr_rescan.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(fsl_mc_bus); + struct bus_type fsl_mc_bus_type = { .name = "fsl-mc", .match = fsl_mc_bus_match, .uevent = fsl_mc_bus_uevent, .dma_configure = fsl_mc_dma_configure, .dev_groups = fsl_mc_dev_groups, + .bus_groups = fsl_mc_bus_groups, }; EXPORT_SYMBOL_GPL(fsl_mc_bus_type); diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h index 6293a24de456..42bdb8679a36 100644 --- a/drivers/bus/fsl-mc/fsl-mc-private.h +++ b/drivers/bus/fsl-mc/fsl-mc-private.h @@ -594,6 +594,9 @@ int __init dprc_driver_init(void); void dprc_driver_exit(void); +int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev, + bool alloc_interrupts); + int __init fsl_mc_allocator_driver_init(void); void fsl_mc_allocator_driver_exit(void); -- 2.29.2
