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coresight: Add generic sysfs link creation functions

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To allow the connections between coresight components to be represented
in sysfs, generic methods for creating sysfs links between two coresight
devices are added.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200518180242.7916-4-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mike Leach 2020-05-18 12:02:22 -06:00 • committed by Greg Kroah-Hartman
parent 68a5d5fccb
commit 8096152588
4 changed files with 150 additions and 1 deletions
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20
include/linux/coresight.h
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@ -148,6 +148,20 @@ struct coresight_connection {
struct coresight_device *child_dev;
};
/**
* struct coresight_sysfs_link - representation of a connection in sysfs.
* @orig: Originating (master) coresight device for the link.
* @orig_name: Name to use for the link orig->target.
* @target: Target (slave) coresight device for the link.
* @target_name: Name to use for the link target->orig.
*/
struct coresight_sysfs_link {
struct coresight_device *orig;
const char *orig_name;
struct coresight_device *target;
const char *target_name;
};
/**
* struct coresight_device - representation of a device as used by the framework
* @pdata: Platform data with device connections associated to this device.
@ -165,6 +179,9 @@ struct coresight_connection {
* @ea: Device attribute for sink representation under PMU directory.
* @ect_dev: Associated cross trigger device. Not part of the trace data
* path or connections.
* @nr_links: number of sysfs links created to other components from this
* device. These will appear in the "connections" group.
* @has_conns_grp: Have added a "connections" group for sysfs links.
*/
struct coresight_device {
struct coresight_platform_data *pdata;
@ -180,6 +197,9 @@ struct coresight_device {
struct dev_ext_attribute *ea;
/* cross trigger handling */
struct coresight_device *ect_dev;
/* sysfs links between components */
int nr_links;
bool has_conns_grp;
};
/*