Commit 64498695 authored by Alexander Usyskin's avatar Alexander Usyskin Committed by Greg Kroah-Hartman
Browse files

mei: bus: add more client attributes to sysfs 



Export more client attributes via sysfs that are usually obtained
upon connection. In some cases, for example a monitoring application
may wish to know the attributes without actually performing the connection.
Added attributes:
max number of connections, fixed address, max message length.

Signed-off-by: default avatarAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20191116142136.17535-1-tomas.winkler@intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 87ff1600

Documentation/ABI/testing/sysfs-bus-mei

+21 −0
Original line number Diff line number Diff line
@@ -26,3 +26,24 @@ KernelVersion: 4.3 
Contact:	Tomas Winkler <tomas.winkler@intel.com>

Description:	Stores mei client protocol version

		Format: %d



What:		/sys/bus/mei/devices/.../max_conn

Date:		Nov 2019

KernelVersion:	5.5

Contact:	Tomas Winkler <tomas.winkler@intel.com>

Description:	Stores mei client maximum number of connections

		Format: %d



What:		/sys/bus/mei/devices/.../fixed

Date:		Nov 2019

KernelVersion:	5.5

Contact:	Tomas Winkler <tomas.winkler@intel.com>

Description:	Stores mei client fixed address, if any

		Format: %d



What:		/sys/bus/mei/devices/.../max_len

Date:		Nov 2019

KernelVersion:	5.5

Contact:	Tomas Winkler <tomas.winkler@intel.com>

Description:	Stores mei client maximum message length

		Format: %d

drivers/misc/mei/bus.c

+33 −0
Original line number Diff line number Diff line
@@ -791,11 +791,44 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *a, 
}

static DEVICE_ATTR_RO(modalias);



static ssize_t max_conn_show(struct device *dev, struct device_attribute *a,

			     char *buf)

{

	struct mei_cl_device *cldev = to_mei_cl_device(dev);

	u8 maxconn = mei_me_cl_max_conn(cldev->me_cl);



	return scnprintf(buf, PAGE_SIZE, "%d", maxconn);

}

static DEVICE_ATTR_RO(max_conn);



static ssize_t fixed_show(struct device *dev, struct device_attribute *a,

			  char *buf)

{

	struct mei_cl_device *cldev = to_mei_cl_device(dev);

	u8 fixed = mei_me_cl_fixed(cldev->me_cl);



	return scnprintf(buf, PAGE_SIZE, "%d", fixed);

}

static DEVICE_ATTR_RO(fixed);



static ssize_t max_len_show(struct device *dev, struct device_attribute *a,

			    char *buf)

{

	struct mei_cl_device *cldev = to_mei_cl_device(dev);

	u32 maxlen = mei_me_cl_max_len(cldev->me_cl);



	return scnprintf(buf, PAGE_SIZE, "%u", maxlen);

}

static DEVICE_ATTR_RO(max_len);



static struct attribute *mei_cldev_attrs[] = {

	&dev_attr_name.attr,

	&dev_attr_uuid.attr,

	&dev_attr_version.attr,

	&dev_attr_modalias.attr,

	&dev_attr_max_conn.attr,

	&dev_attr_fixed.attr,

	&dev_attr_max_len.attr,

	NULL,

};

ATTRIBUTE_GROUPS(mei_cldev);

drivers/misc/mei/client.h

+36 −0
Original line number Diff line number Diff line
@@ -69,6 +69,42 @@ static inline u8 mei_me_cl_ver(const struct mei_me_client *me_cl) 
	return me_cl->props.protocol_version;

}



/**

 * mei_me_cl_max_conn - return me client max number of connections

 *

 * @me_cl: me client

 *

 * Return: me client max number of connections

 */

static inline u8 mei_me_cl_max_conn(const struct mei_me_client *me_cl)

{

	return me_cl->props.max_number_of_connections;

}



/**

 * mei_me_cl_fixed - return me client fixed address, if any

 *

 * @me_cl: me client

 *

 * Return: me client fixed address

 */

static inline u8 mei_me_cl_fixed(const struct mei_me_client *me_cl)

{

	return me_cl->props.fixed_address;

}



/**

 * mei_me_cl_max_len - return me client max msg length

 *

 * @me_cl: me client

 *

 * Return: me client max msg length

 */

static inline u32 mei_me_cl_max_len(const struct mei_me_client *me_cl)

{

	return me_cl->props.max_msg_length;

}



/*

 * MEI IO Functions

 */

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