Commit 296c6264 authored by Ioana Ciornei's avatar Ioana Ciornei Committed by Greg Kroah-Hartman
Browse files

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: default avatarLaurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: default avatarIoana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20210114170752.2927915-6-ciorneiioana@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3f609943

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

+10 −0
Original line number Diff line number Diff line
@@ -7,3 +7,13 @@ Description: Writing a non-zero value to this attribute will 
		synchronize the objects under fsl-mc bus and the

		Management Complex firmware.

Users:		Userspace drivers and management tools



What:		/sys/bus/fsl-mc/autorescan

Date:		January 2021

KernelVersion:	5.12

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

Description:	Writing a zero value to this attribute will

		disable the DPRC IRQs on which automatic rescan

		of the fsl-mc bus is performed. A non-zero value

		will enable the DPRC IRQs.

Users:		Userspace drivers and management tools

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

+15 −2
Original line number Diff line number Diff line
@@ -458,8 +458,9 @@ static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg) 
/*

 * Disable and clear interrupt for a given DPRC object

 */

static int disable_dprc_irq(struct fsl_mc_device *mc_dev)

int disable_dprc_irq(struct fsl_mc_device *mc_dev)

{

	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);

	int error;

	struct fsl_mc_io *mc_io = mc_dev->mc_io;
@@ -496,9 +497,18 @@ static int disable_dprc_irq(struct fsl_mc_device *mc_dev) 
		return error;

	}



	mc_bus->irq_enabled = 0;



	return 0;

}



int get_dprc_irq_state(struct fsl_mc_device *mc_dev)

{

	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);



	return mc_bus->irq_enabled;

}



static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)

{

	int error;
@@ -525,8 +535,9 @@ static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev) 
	return 0;

}



static int enable_dprc_irq(struct fsl_mc_device *mc_dev)

int enable_dprc_irq(struct fsl_mc_device *mc_dev)

{

	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);

	int error;



	/*
@@ -554,6 +565,8 @@ static int enable_dprc_irq(struct fsl_mc_device *mc_dev) 
		return error;

	}



	mc_bus->irq_enabled = 1;



	return 0;

}

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

+55 −0
Original line number Diff line number Diff line
@@ -241,8 +241,63 @@ static ssize_t rescan_store(struct bus_type *bus, 
}

static BUS_ATTR_WO(rescan);



static int fsl_mc_bus_set_autorescan(struct device *dev, void *data)

{

	struct fsl_mc_device *root_mc_dev;

	unsigned long val;

	char *buf = data;



	if (!fsl_mc_is_root_dprc(dev))

		goto exit;



	root_mc_dev = to_fsl_mc_device(dev);



	if (kstrtoul(buf, 0, &val) < 0)

		return -EINVAL;



	if (val)

		enable_dprc_irq(root_mc_dev);

	else

		disable_dprc_irq(root_mc_dev);



exit:

	return 0;

}



static int fsl_mc_bus_get_autorescan(struct device *dev, void *data)

{

	struct fsl_mc_device *root_mc_dev;

	char *buf = data;



	if (!fsl_mc_is_root_dprc(dev))

		goto exit;



	root_mc_dev = to_fsl_mc_device(dev);



	sprintf(buf, "%d\n", get_dprc_irq_state(root_mc_dev));

exit:

	return 0;

}



static ssize_t autorescan_store(struct bus_type *bus,

				const char *buf, size_t count)

{

	bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_set_autorescan);



	return count;

}



static ssize_t autorescan_show(struct bus_type *bus, char *buf)

{

	bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_get_autorescan);

	return strlen(buf);

}



static BUS_ATTR_RW(autorescan);



static struct attribute *fsl_mc_bus_attrs[] = {

	&bus_attr_rescan.attr,

	&bus_attr_autorescan.attr,

	NULL,

};

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

+5 −0
Original line number Diff line number Diff line
@@ -578,6 +578,7 @@ struct fsl_mc_bus { 
	struct mutex scan_mutex;    /* serializes bus scanning */

	struct dprc_attributes dprc_attr;

	struct fsl_mc_uapi uapi_misc;

	int irq_enabled;

};



#define to_fsl_mc_bus(_mc_dev) \
@@ -656,4 +657,8 @@ static inline void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus) 


#endif



int disable_dprc_irq(struct fsl_mc_device *mc_dev);

int enable_dprc_irq(struct fsl_mc_device *mc_dev);

int get_dprc_irq_state(struct fsl_mc_device *mc_dev);



#endif /* _FSL_MC_PRIVATE_H_ */