linux-kernel - [PATCH v2 2/2] media: vsp1: vsp1

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Message-Id: <20250616-vsp1_dl_list_count-v2-2-7d3f43fb1306@ideasonboard.com>
Date: Mon, 16 Jun 2025 18:30:38 +0200
From: Jacopo Mondi <jacopo.mondi+renesas@...asonboard.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Kieran Bingham <kieran.bingham+renesas@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Jacopo Mondi <jacopo.mondi+renesas@...asonboard.com>
Subject: [PATCH v2 2/2] media: vsp1: vsp1_dl: Count display lists

To detect leaks of display lists, store in the display list manager the
number of allocated display lists when the manager is created and verify
that when the display manager is reset the same number of lists is
allocated.

Signed-off-by: Jacopo Mondi <jacopo.mondi+renesas@...asonboard.com>
---
 drivers/media/platform/renesas/vsp1/vsp1_dl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/media/platform/renesas/vsp1/vsp1_dl.c b/drivers/media/platform/renesas/vsp1/vsp1_dl.c
index 18617cbb168703b851a9b437fa62f18425934c68..3713730c6ad8739935851e4da464fc8f23da6180 100644
--- a/drivers/media/platform/renesas/vsp1/vsp1_dl.c
+++ b/drivers/media/platform/renesas/vsp1/vsp1_dl.c
@@ -215,6 +215,7 @@ struct vsp1_dl_list {
  * @pending: list waiting to be queued to the hardware
  * @pool: body pool for the display list bodies
  * @cmdpool: commands pool for extended display list
+ * @list_count: number of allocated display lists
  */
 struct vsp1_dl_manager {
 	unsigned int index;
@@ -229,6 +230,8 @@ struct vsp1_dl_manager {
 
 	struct vsp1_dl_body_pool *pool;
 	struct vsp1_dl_cmd_pool *cmdpool;
+
+	size_t list_count;
 };
 
 /* -----------------------------------------------------------------------------
@@ -1078,6 +1081,7 @@ void vsp1_dlm_setup(struct vsp1_device *vsp1)
 void vsp1_dlm_reset(struct vsp1_dl_manager *dlm)
 {
 	unsigned long flags;
+	size_t list_count;
 
 	spin_lock_irqsave(&dlm->lock, flags);
 
@@ -1085,8 +1089,11 @@ void vsp1_dlm_reset(struct vsp1_dl_manager *dlm)
 	__vsp1_dl_list_put(dlm->queued);
 	__vsp1_dl_list_put(dlm->pending);
 
+	list_count = list_count_nodes(&dlm->free);
 	spin_unlock_irqrestore(&dlm->lock, flags);
 
+	WARN_ON_ONCE(list_count != dlm->list_count);
+
 	dlm->active = NULL;
 	dlm->queued = NULL;
 	dlm->pending = NULL;
@@ -1155,6 +1162,7 @@ struct vsp1_dl_manager *vsp1_dlm_create(struct vsp1_device *vsp1,
 
 		list_add_tail(&dl->list, &dlm->free);
 	}
+	dlm->list_count = prealloc;
 
 	if (vsp1_feature(vsp1, VSP1_HAS_EXT_DL)) {
 		dlm->cmdpool = vsp1_dl_cmd_pool_create(vsp1,

-- 
2.49.0