linux-kernel - [PATCH 4/6] drm/msm/rd: allow adding addition msg to top of dump

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Message-Id: <20171024132256.20286-5-robdclark@gmail.com>
Date:   Tue, 24 Oct 2017 09:22:51 -0400
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Rob Clark <robdclark@...il.com>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] drm/msm/rd: allow adding addition msg to top of dump

For faults or hangs, it is nice to be able to include a bit more
information.

Signed-off-by: Rob Clark <robdclark@...il.com>
---
 drivers/gpu/drm/msm/msm_drv.h |  3 ++-
 drivers/gpu/drm/msm/msm_gpu.c |  2 +-
 drivers/gpu/drm/msm/msm_rd.c  | 15 +++++++++++++--
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index b01bd7fa9c2b..a007bbf4d94d 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -299,7 +299,8 @@ void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m);
 int msm_debugfs_late_init(struct drm_device *dev);
 int msm_rd_debugfs_init(struct drm_minor *minor);
 void msm_rd_debugfs_cleanup(struct msm_drm_private *priv);
-void msm_rd_dump_submit(struct msm_rd_state *rd, struct msm_gem_submit *submit);
+void msm_rd_dump_submit(struct msm_rd_state *rd, struct msm_gem_submit *submit,
+		const char *fmt, ...);
 int msm_perf_debugfs_init(struct drm_minor *minor);
 void msm_perf_debugfs_cleanup(struct msm_drm_private *priv);
 #else
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 5baeb34f098e..403baea19329 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -556,7 +556,7 @@ void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 
 	list_add_tail(&submit->node, &ring->submits);
 
-	msm_rd_dump_submit(priv->rd, submit);
+	msm_rd_dump_submit(priv->rd, submit, NULL);
 
 	update_sw_cntrs(gpu);
 
diff --git a/drivers/gpu/drm/msm/msm_rd.c b/drivers/gpu/drm/msm/msm_rd.c
index d689407c809a..3aa8a8576abe 100644
--- a/drivers/gpu/drm/msm/msm_rd.c
+++ b/drivers/gpu/drm/msm/msm_rd.c
@@ -346,11 +346,12 @@ static void snapshot_buf(struct msm_rd_state *rd,
 }
 
 /* called under struct_mutex */
-void msm_rd_dump_submit(struct msm_rd_state *rd, struct msm_gem_submit *submit)
+void msm_rd_dump_submit(struct msm_rd_state *rd, struct msm_gem_submit *submit,
+		const char *fmt, ...)
 {
 	struct drm_device *dev = submit->dev;
 	struct task_struct *task;
-	char msg[128];
+	char msg[256];
 	int i, n;
 
 	if (!rd->open)
@@ -361,6 +362,16 @@ void msm_rd_dump_submit(struct msm_rd_state *rd, struct msm_gem_submit *submit)
 	 */
 	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 
+	if (fmt) {
+		va_list args;
+
+		va_start(args, fmt);
+		n = vsnprintf(msg, sizeof(msg), fmt, args);
+		va_end(args);
+
+		rd_write_section(rd, RD_CMD, msg, ALIGN(n, 4));
+	}
+
 	rcu_read_lock();
 	task = pid_task(submit->pid, PIDTYPE_PID);
 	if (task) {
-- 
2.13.6