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* [PATCH V5 1/3] core/device: Add function to return child node using name at substring "@"
@ 2023-07-17  3:24 Athira Rajeev
  2023-07-17  3:24 ` [PATCH V5 2/3] skiboot: Update IMC code to use dt_find_by_name_before_addr for checking dt nodes Athira Rajeev
                   ` (2 more replies)
  0 siblings, 3 replies; 7+ messages in thread
From: Athira Rajeev @ 2023-07-17  3:24 UTC (permalink / raw)
  To: skiboot, dan, arbab, mpe, maddy
  Cc: kjain, Athira Rajeev, disgoel, linuxppc-dev, mahesh

Add a function dt_find_by_name_before_addr() that returns the child node if
it matches till first occurrence at "@" of a given name, otherwise NULL.
This is helpful for cases with node name like: "name@addr". In
scenarios where nodes are added with "name@addr" format and if the
value of "addr" is not known, that node can't be matched with node
name or addr. Hence matching with substring as node name will return
the expected result. Patch adds dt_find_by_name_before_addr() function
and testcase for the same in core/test/run-device.c

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>
---
Changelog:
v4 -> v5:
- Addressed review comment from Reza and renamed
  dt_find_by_name_substr to dt_find_by_name_before_addr

v3 -> v4:
- Addressed review comment from Mahesh and added his Reviewed-by.

v2 -> v3:
- After review comments from Mahesh, fixed the code
  to consider string upto "@" for both input node name
  as well as child node name. V2 version was comparing
  input node name and child node name upto string length
  of child name. But this will return wrong node if input
  name is larger than child name. Because it will match
  as substring for child name.
  https://lists.ozlabs.org/pipermail/skiboot/2023-January/018596.html

v1 -> v2:
- Addressed review comment from Dan to update
  the utility funtion to search and compare
  upto "@". Renamed it as dt_find_by_name_substr.

 core/device.c          | 31 +++++++++++++++++++++++++++++++
 core/test/run-device.c | 14 ++++++++++++++
 include/device.h       |  3 +++
 3 files changed, 48 insertions(+)

diff --git a/core/device.c b/core/device.c
index b102dd97..a61a72b0 100644
--- a/core/device.c
+++ b/core/device.c
@@ -395,6 +395,37 @@ struct dt_node *dt_find_by_name(struct dt_node *root, const char *name)
 }
 
 
+struct dt_node *dt_find_by_name_before_addr(struct dt_node *root, const char *name)
+{
+	struct dt_node *child, *match;
+	char *node, *child_node = NULL;
+
+	node = strdup(name);
+	if (!node)
+		return NULL;
+	node = strtok(node, "@");
+	list_for_each(&root->children, child, list) {
+		child_node = strdup(child->name);
+		if (!child_node)
+			goto err;
+		child_node = strtok(child_node, "@");
+		if (!strcmp(child_node, node)) {
+			free(child_node);
+			free(node);
+			return child;
+		}
+
+		match = dt_find_by_name_before_addr(child, name);
+		if (match)
+			return match;
+	}
+
+	free(child_node);
+err:
+	free(node);
+	return NULL;
+}
+
 struct dt_node *dt_new_check(struct dt_node *parent, const char *name)
 {
 	struct dt_node *node = dt_find_by_name(parent, name);
diff --git a/core/test/run-device.c b/core/test/run-device.c
index 4a12382b..f1cb79bf 100644
--- a/core/test/run-device.c
+++ b/core/test/run-device.c
@@ -466,6 +466,20 @@ int main(void)
 	new_prop_ph = dt_prop_get_u32(ut2, "something");
 	assert(!(new_prop_ph == ev1_ph));
 	dt_free(subtree);
+
+	/* Test dt_find_by_name_before_addr */
+	root = dt_new_root("");
+	addr1 = dt_new_addr(root, "node", 0x1);
+	addr2 = dt_new_addr(root, "node0_1", 0x2);
+	assert(dt_find_by_name(root, "node@1") == addr1);
+	assert(dt_find_by_name(root, "node0_1@2") == addr2);
+	assert(dt_find_by_name_before_addr(root, "node@1") == addr1);
+	assert(dt_find_by_name_before_addr(root, "node0_") == NULL);
+	assert(dt_find_by_name_before_addr(root, "node0_1") == addr2);
+	assert(dt_find_by_name_before_addr(root, "node0@") == NULL);
+	assert(dt_find_by_name_before_addr(root, "node0_@") == NULL);
+	dt_free(root);
+
 	return 0;
 }
 
diff --git a/include/device.h b/include/device.h
index 93fb90ff..f2402cc4 100644
--- a/include/device.h
+++ b/include/device.h
@@ -184,6 +184,9 @@ struct dt_node *dt_find_by_path(struct dt_node *root, const char *path);
 /* Find a child node by name */
 struct dt_node *dt_find_by_name(struct dt_node *root, const char *name);
 
+/* Find a child node by name and substring */
+struct dt_node *dt_find_by_name_before_addr(struct dt_node *root, const char *name);
+
 /* Find a node by phandle */
 struct dt_node *dt_find_by_phandle(struct dt_node *root, u32 phandle);
 
-- 
2.39.3


^ permalink raw reply related	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2023-09-11  5:31 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-07-17  3:24 [PATCH V5 1/3] core/device: Add function to return child node using name at substring "@" Athira Rajeev
2023-07-17  3:24 ` [PATCH V5 2/3] skiboot: Update IMC code to use dt_find_by_name_before_addr for checking dt nodes Athira Rajeev
2023-07-17  3:24 ` [PATCH V5 3/3] skiboot: Update IMC PMU node names for power10 Athira Rajeev
2023-08-09 21:58   ` Reza Arbab
2023-09-11  5:01     ` Athira Rajeev
2023-08-09 21:51 ` [PATCH V5 1/3] core/device: Add function to return child node using name at substring "@" Reza Arbab
2023-09-11  5:15   ` Athira Rajeev

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