Commit 3f609943 authored by Ioana Ciornei's avatar Ioana Ciornei Committed by Greg Kroah-Hartman
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bus: fsl-mc: add bus rescan attribute 



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

Acked-by: default avatarLaurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: default avatarIoana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20210114170752.2927915-5-ciorneiioana@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2cf1e703

Documentation/ABI/stable/sysfs-bus-fsl-mc

0 → 100644
+9 −0
Original line number Diff line number Diff line 
What:		/sys/bus/fsl-mc/rescan

Date:		January 2021

KernelVersion:	5.12

Contact:	Ioana Ciornei <ioana.ciornei@nxp.com>

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

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -14649,6 +14649,7 @@ M: Stuart Yoder <stuyoder@gmail.com> 
M:	Laurentiu Tudor <laurentiu.tudor@nxp.com>

L:	linux-kernel@vger.kernel.org

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/

drivers/bus/fsl-mc/dprc-driver.c

+2 −2
Original line number Diff line number Diff line
@@ -237,7 +237,7 @@ 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,

int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,

		      bool alloc_interrupts)

{

	int num_child_objects;

drivers/bus/fsl-mc/fsl-mc-bus.c

+41 −0
Original line number Diff line number Diff line
@@ -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);

drivers/bus/fsl-mc/fsl-mc-private.h

+3 −0
Original line number Diff line number Diff line
@@ -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);