Cc: Rob

On 01/03/2023 15:11, Jinlong Mao wrote:

Hi Suzuki,

On 2/9/2023 10:16 AM, Jinlong Mao wrote:

On 2/8/2023 10:26 PM, Suzuki K Poulose wrote:

On 08/02/2023 11:07, Mao Jinlong wrote:

Apart from STM and ETM sources, there will be more sources added to
coresight components. For example, there are over 10 TPDM sources.
Add coresight name support for custom names which will be
easy to identify the source.

As we have previously discussed, please don't make this a generic
code change. If your device has a "specifici" name, use that for
allocating in the driver and leave the core code alone.

Suzuki

Hi Suzuki,

Not only for TPDMs. There could be dozens of CTI devices.
It is hard for user to know which CTI device it is with current names.

Thanks
Jinlong Mao

The coresight name support is applicable to CTI and TPDM devices.
This is a generic change for the source which has dozens of devices.

I took a look at the CTI situation and I agree that the situation
is a bit tricky. The CTI could be connected to multiple devices,
some of them may not be even CoreSight devices. Given there could
be numerous of them, we need some way to make the "devices" naming
a bit more intuitive.

Before we go ahead and add something specific to coresight, I would
like to see if there is a generic property. Ideally, the "labels"
in the DTS sources would have been an ideal choice, but can't
see how that is available in the FDT.

Suzuki

Thanks
Jinlong Mao

Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
---
  drivers/hwtracing/coresight/coresight-core.c | 34 +++++++++++---------
  1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index d3bf82c0de1d..5e95d9c7f256 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1733,28 +1733,32 @@ char *coresight_alloc_device_name(struct coresight_dev_list *dict,
  {
      int idx;
      char *name = NULL;
+    const char *coresight_name = NULL;
      struct fwnode_handle **list;
+    struct device_node *node = dev->of_node;
        mutex_lock(&coresight_mutex);
  -    idx = coresight_search_device_idx(dict, dev_fwnode(dev));
-    if (idx < 0) {
-        /* Make space for the new entry */
-        idx = dict->nr_idx;
-        list = krealloc_array(dict->fwnode_list,
-                      idx + 1, sizeof(*dict->fwnode_list),
-                      GFP_KERNEL);
-        if (ZERO_OR_NULL_PTR(list)) {
-            idx = -ENOMEM;
-            goto done;
+    if (!of_property_read_string(node, "coresight-name", &coresight_name))
+        name = devm_kasprintf(dev, GFP_KERNEL, "%s", coresight_name);
+    else {
+        idx = coresight_search_device_idx(dict, dev_fwnode(dev));
+        if (idx < 0) {
+            /* Make space for the new entry */
+            idx = dict->nr_idx;
+            list = krealloc_array(dict->fwnode_list,
+                          idx + 1, sizeof(*dict->fwnode_list),
+                          GFP_KERNEL);
+            if (ZERO_OR_NULL_PTR(list))
+                goto done;
+
+            list[idx] = dev_fwnode(dev);
+            dict->fwnode_list = list;
+            dict->nr_idx = idx + 1;
          }
  -        list[idx] = dev_fwnode(dev);
-        dict->fwnode_list = list;
-        dict->nr_idx = idx + 1;
+        name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
      }
-
-    name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
  done:
      mutex_unlock(&coresight_mutex);
      return name;

_______________________________________________
CoreSight mailing list -- coresight@lists.linaro.org
To unsubscribe send an email to coresight-leave@lists.linaro.org