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 --- drivers/hwtracing/coresight/coresight-cti.c | 41 ++++++++++++++++++++- 1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c index 9e18e176831c..f620e9460e7d 100644 --- a/drivers/hwtracing/coresight/coresight-cti.c +++ b/drivers/hwtracing/coresight/coresight-cti.c @@ -441,6 +441,37 @@ int cti_channel_setop(struct device *dev, enum cti_chan_set_op op, return err; }
+static void cti_add_sysfs_link(struct cti_drvdata *drvdata, + struct cti_trig_con *tc) +{ + struct coresight_sysfs_link link_info; + + 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); + coresight_add_sysfs_link(&link_info); +} + +static void cti_remove_all_sysfs_links(struct cti_drvdata *drvdata) +{ + struct cti_trig_con *tc; + struct cti_device *ctidev = &drvdata->ctidev; + struct coresight_sysfs_link link_info; + + /* origin device and target link name constant for this cti */ + link_info.orig = drvdata->csdev; + link_info.target_name = dev_name(&drvdata->csdev->dev); + + list_for_each_entry(tc, &ctidev->trig_cons, node) { + if (tc->con_dev) { + link_info.target = tc->con_dev; + link_info.orig_name = tc->con_dev_name; + 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 +483,8 @@ cti_match_fixup_csdev(struct cti_device *ctidev, const char *node_name, { struct cti_trig_con *tc; const char *csdev_name; + 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) { @@ -462,6 +495,7 @@ cti_match_fixup_csdev(struct cti_device *ctidev, const char *node_name, devm_kstrdup(&csdev->dev, csdev_name, GFP_KERNEL); tc->con_dev = csdev; + cti_add_sysfs_link(drvdata, tc); return true; } } @@ -546,10 +580,12 @@ 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) + if (tc->con_dev) { /* set tc->con_dev->ect_dev */ coresight_set_assoc_ectdev_mutex(tc->con_dev, drvdata->csdev); + cti_add_sysfs_link(drvdata, tc); + } } }
@@ -602,6 +638,9 @@ static void cti_device_release(struct device *dev) mutex_lock(&ect_mutex); cti_remove_conn_xrefs(drvdata);
+ /* clear the dynamic sysfs associate with connections */ + cti_remove_all_sysfs_links(drvdata); + /* remove from the list */ list_for_each_entry_safe(ect_item, ect_tmp, &ect_net, node) { if (ect_item == drvdata) {