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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>
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Documentation/ABI/stable/sysfs-bus-fsl-mc
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9
Documentation/ABI/stable/sysfs-bus-fsl-mc
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@ -0,0 +1,9 @@
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What: /sys/bus/fsl-mc/devices/dprc.*/rescan
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Date: November 2018
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KernelVersion: 5.0
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Contact: Ioana Ciornei <ioana.ciornei@nxp.com>
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Description: Writing a non-zero value to this attribute will
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force a rescan of dprc.X container in the system and
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synchronize the objects under dprc.X and the
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Management Complex firmware.
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Users: Userspace drivers and management tools
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@ -13448,6 +13448,7 @@ F: Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt
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F: Documentation/networking/device_drivers/freescale/dpaa2/overview.rst
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F: Documentation/networking/dpaa2/overview.rst
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F: include/uapi/linux/fsl_mc.h
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F: Documentation/ABI/stable/sysfs-bus-fsl-mc
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QT1010 MEDIA DRIVER
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M: Antti Palosaari <crope@iki.fi>
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@ -354,6 +354,33 @@ static int dprc_scan_container(struct fsl_mc_device *mc_bus_dev)
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return 0;
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}
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static ssize_t rescan_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct fsl_mc_device *root_mc_dev;
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struct fsl_mc_bus *root_mc_bus;
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unsigned long val;
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if (!fsl_mc_is_root_dprc(dev))
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return -EINVAL;
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root_mc_dev = to_fsl_mc_device(dev);
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root_mc_bus = to_fsl_mc_bus(root_mc_dev);
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if (kstrtoul(buf, 0, &val) < 0)
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return -EINVAL;
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if (val) {
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mutex_lock(&root_mc_bus->scan_mutex);
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dprc_scan_objects(root_mc_dev, NULL);
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mutex_unlock(&root_mc_bus->scan_mutex);
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}
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return count;
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}
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static DEVICE_ATTR_WO(rescan);
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/**
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* dprc_irq0_handler - Regular ISR for DPRC interrupt 0
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*
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@ -692,6 +719,13 @@ static int dprc_probe(struct fsl_mc_device *mc_dev)
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mutex_init(&mc_bus->scan_mutex);
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error = device_create_file(&mc_dev->dev, &dev_attr_rescan);
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if (error < 0) {
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dev_err(&mc_dev->dev, "device_create_file() failed: %d\n",
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error);
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goto error_cleanup_open;
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}
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/*
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* Discover MC objects in DPRC object:
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*/
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@ -788,6 +822,8 @@ static int dprc_remove(struct fsl_mc_device *mc_dev)
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fsl_mc_uapi_remove_device_file(mc_bus);
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}
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device_remove_file(&mc_dev->dev, &dev_attr_rescan);
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dev_info(&mc_dev->dev, "DPRC device unbound from driver");
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return 0;
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}
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