On 2/11/2022 4:38 PM, Dmitry Baryshkov wrote:

From: Bjorn Andersson bjorn.andersson@linaro.org

dpu_kms_debugfs_init() is invoked for each minor being registered. Most of the files created are unrelated to the minor, so there's no reason to present them per minor. The exception to this is the DisplayPort code, which ends up invoking dp_debug_get() for each minor, each time associate the allocated object with dp->debug.

As such dp_debug will create debugfs files in both the PRIMARY and the RENDER minor's debugfs directory, but only the last reference will be remembered.

The only use of this reference today is in the cleanup path in dp_display_deinit_sub_modules() and the dp_debug_private object does outlive the debugfs entries in either case, so there doesn't seem to be any adverse effects of this, but per the code the current behavior is unexpected, so change it to only create debugfs files for the PRIMARY minor.

Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org [DB: slightly change description and in-patch comment] Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org

Reviewed-by: Abhinav Kumar quic_abhinavk@quicinc.com

---

This is a replacement for https://patchwork.freedesktop.org/patch/467273/ with the patch subject and comment being fixed.

---

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c index 5f0dc44119c9..c394bd6b2e5d 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c @@ -271,6 +271,10 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor) if (!p) return -EINVAL;

• /* Only create a set of debugfs for the primary node, ignore render nodes */
• if (minor->type != DRM_MINOR_PRIMARY)

• return 0;
  

• dev = dpu_kms->dev; priv = dev->dev_private;