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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>
5.4-rM2-2.2.x-imx-squashed
Ioana Ciornei 2018-03-05 18:37:32 +02:00 committed by Dong Aisheng
parent 672699a389
commit 959a22bedb
3 changed files with 46 additions and 0 deletions
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9
Documentation/ABI/stable/sysfs-bus-fsl-mc 100644
View File

@ -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

1
MAINTAINERS
View File

@ -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>

36
drivers/bus/fsl-mc/dprc-driver.c
View File

@ -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;
}