korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 12:28:41 +08:00
Code Issues Packages Projects Releases Wiki Activity

coresight: cti: Add in sysfs links to other coresight devices

Browse Source 
Adds in sysfs links for connections where the connected device is another
coresight device. This allows examination of the coresight topology.

Non-coresight connections remain just as a reference name.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200518180242.7916-6-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mike Leach 2020-05-18 12:02:24 -06:00 committed by Greg Kroah-Hartman
parent 8a7365c2d4
commit 73274abb65
1 changed files with 48 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
drivers/hwtracing/coresight/coresight-cti.c
View File

@ -442,6 +442,34 @@ int cti_channel_setop(struct device *dev, enum cti_chan_set_op op,
return err;
}
static bool cti_add_sysfs_link(struct cti_drvdata *drvdata,
struct cti_trig_con *tc)
{
struct coresight_sysfs_link link_info;
int link_err = 0;
link_info.orig = drvdata->csdev;
link_info.orig_name = tc->con_dev_name;
link_info.target = tc->con_dev;
link_info.target_name = dev_name(&drvdata->csdev->dev);
link_err = coresight_add_sysfs_link(&link_info);
if (link_err)
dev_warn(&drvdata->csdev->dev,
"Failed to set CTI sysfs link %s<=>%s\n",
link_info.orig_name, link_info.target_name);
return !link_err;
}
static void cti_remove_sysfs_link(struct cti_trig_con *tc)
{
struct coresight_sysfs_link link_info;
link_info.orig_name = tc->con_dev_name;
link_info.target = tc->con_dev;
coresight_remove_sysfs_link(&link_info);
}
/*
* Look for a matching connection device name in the list of connections.
* If found then swap in the csdev name, set trig con association pointer
@ -452,6 +480,8 @@ cti_match_fixup_csdev(struct cti_device *ctidev, const char *node_name,
struct coresight_device *csdev)
{
struct cti_trig_con *tc;
struct cti_drvdata *drvdata = container_of(ctidev, struct cti_drvdata,
ctidev);
list_for_each_entry(tc, &ctidev->trig_cons, node) {
if (tc->con_dev_name) {
@ -459,7 +489,12 @@ cti_match_fixup_csdev(struct cti_device *ctidev, const char *node_name,
/* match: so swap in csdev name & dev */
tc->con_dev_name = dev_name(&csdev->dev);
tc->con_dev = csdev;
return true;
/* try to set sysfs link */
if (cti_add_sysfs_link(drvdata, tc))
return true;
/* link failed - remove CTI reference */
tc->con_dev = NULL;
break;
}
}
}
@ -522,6 +557,7 @@ void cti_remove_assoc_from_csdev(struct coresight_device *csdev)
ctidev = &ctidrv->ctidev;
list_for_each_entry(tc, &ctidev->trig_cons, node) {
if (tc->con_dev == csdev->ect_dev) {
cti_remove_sysfs_link(tc);
tc->con_dev = NULL;
break;
}
@ -543,10 +579,16 @@ static void cti_update_conn_xrefs(struct cti_drvdata *drvdata)
struct cti_device *ctidev = &drvdata->ctidev;
list_for_each_entry(tc, &ctidev->trig_cons, node) {
if (tc->con_dev)
/* set tc->con_dev->ect_dev */
coresight_set_assoc_ectdev_mutex(tc->con_dev,
if (tc->con_dev) {
/* if we can set the sysfs link */
if (cti_add_sysfs_link(drvdata, tc))
/* set the CTI/csdev association */
coresight_set_assoc_ectdev_mutex(tc->con_dev,
drvdata->csdev);
else
/* otherwise remove reference from CTI */
tc->con_dev = NULL;
}
}
}
@ -559,6 +601,8 @@ static void cti_remove_conn_xrefs(struct cti_drvdata *drvdata)
if (tc->con_dev) {
coresight_set_assoc_ectdev_mutex(tc->con_dev,
NULL);
cti_remove_sysfs_link(tc);
tc->con_dev = NULL;
}
}
}