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

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;
}
}
}