forked from Minki/linux
bus: fsl-mc: add autorescan sysfs
Add the autorescan sysfs in order to enable/disable the DPRC IRQs on which automatic rescan of the bus is performed. This is important when dynamic creation of objects is needed to happen in a timely manner because object creation can be bundled together. Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com> Link: https://lore.kernel.org/r/20210114170752.2927915-6-ciorneiioana@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -7,3 +7,13 @@ Description: Writing a non-zero value to this attribute will
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synchronize the objects under fsl-mc bus and the
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synchronize the objects under fsl-mc bus and the
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Management Complex firmware.
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Management Complex firmware.
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Users: Userspace drivers and management tools
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Users: Userspace drivers and management tools
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What: /sys/bus/fsl-mc/autorescan
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Date: January 2021
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KernelVersion: 5.12
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Contact: Ioana Ciornei <ioana.ciornei@nxp.com>
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Description: Writing a zero value to this attribute will
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disable the DPRC IRQs on which automatic rescan
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of the fsl-mc bus is performed. A non-zero value
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will enable the DPRC IRQs.
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Users: Userspace drivers and management tools
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@ -458,8 +458,9 @@ out:
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/*
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/*
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* Disable and clear interrupt for a given DPRC object
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* Disable and clear interrupt for a given DPRC object
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*/
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*/
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static int disable_dprc_irq(struct fsl_mc_device *mc_dev)
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int disable_dprc_irq(struct fsl_mc_device *mc_dev)
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{
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{
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struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
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int error;
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int error;
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struct fsl_mc_io *mc_io = mc_dev->mc_io;
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struct fsl_mc_io *mc_io = mc_dev->mc_io;
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@ -496,9 +497,18 @@ static int disable_dprc_irq(struct fsl_mc_device *mc_dev)
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return error;
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return error;
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}
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}
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mc_bus->irq_enabled = 0;
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return 0;
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return 0;
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}
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}
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int get_dprc_irq_state(struct fsl_mc_device *mc_dev)
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{
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struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
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return mc_bus->irq_enabled;
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}
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static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)
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static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)
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{
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{
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int error;
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int error;
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@ -525,8 +535,9 @@ static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)
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return 0;
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return 0;
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}
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}
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static int enable_dprc_irq(struct fsl_mc_device *mc_dev)
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int enable_dprc_irq(struct fsl_mc_device *mc_dev)
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{
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{
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struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
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int error;
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int error;
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/*
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/*
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@ -554,6 +565,8 @@ static int enable_dprc_irq(struct fsl_mc_device *mc_dev)
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return error;
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return error;
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}
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}
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mc_bus->irq_enabled = 1;
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return 0;
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return 0;
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}
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}
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@ -241,8 +241,63 @@ static ssize_t rescan_store(struct bus_type *bus,
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}
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}
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static BUS_ATTR_WO(rescan);
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static BUS_ATTR_WO(rescan);
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static int fsl_mc_bus_set_autorescan(struct device *dev, void *data)
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{
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struct fsl_mc_device *root_mc_dev;
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unsigned long val;
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char *buf = data;
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if (!fsl_mc_is_root_dprc(dev))
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goto exit;
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root_mc_dev = to_fsl_mc_device(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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enable_dprc_irq(root_mc_dev);
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else
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disable_dprc_irq(root_mc_dev);
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exit:
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return 0;
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}
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static int fsl_mc_bus_get_autorescan(struct device *dev, void *data)
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{
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struct fsl_mc_device *root_mc_dev;
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char *buf = data;
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if (!fsl_mc_is_root_dprc(dev))
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goto exit;
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root_mc_dev = to_fsl_mc_device(dev);
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sprintf(buf, "%d\n", get_dprc_irq_state(root_mc_dev));
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exit:
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return 0;
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}
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static ssize_t autorescan_store(struct bus_type *bus,
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const char *buf, size_t count)
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{
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bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_set_autorescan);
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return count;
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}
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static ssize_t autorescan_show(struct bus_type *bus, char *buf)
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{
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bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_get_autorescan);
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return strlen(buf);
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}
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static BUS_ATTR_RW(autorescan);
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static struct attribute *fsl_mc_bus_attrs[] = {
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static struct attribute *fsl_mc_bus_attrs[] = {
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&bus_attr_rescan.attr,
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&bus_attr_rescan.attr,
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&bus_attr_autorescan.attr,
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NULL,
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NULL,
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};
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};
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@ -578,6 +578,7 @@ struct fsl_mc_bus {
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struct mutex scan_mutex; /* serializes bus scanning */
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struct mutex scan_mutex; /* serializes bus scanning */
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struct dprc_attributes dprc_attr;
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struct dprc_attributes dprc_attr;
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struct fsl_mc_uapi uapi_misc;
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struct fsl_mc_uapi uapi_misc;
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int irq_enabled;
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};
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};
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#define to_fsl_mc_bus(_mc_dev) \
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#define to_fsl_mc_bus(_mc_dev) \
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@ -656,4 +657,8 @@ static inline void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
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#endif
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#endif
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int disable_dprc_irq(struct fsl_mc_device *mc_dev);
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int enable_dprc_irq(struct fsl_mc_device *mc_dev);
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int get_dprc_irq_state(struct fsl_mc_device *mc_dev);
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#endif /* _FSL_MC_PRIVATE_H_ */
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#endif /* _FSL_MC_PRIVATE_H_ */
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