| Message ID | 20211217002026.2304973-1-bjorn.andersson@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] drm/msm/dp: Only create debugfs for PRIMARY minor | expand |
On 12/16/2021 4:20 PM, Bjorn Andersson wrote: > 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> > --- > > Changes since v1: > - Moved the check up from msm_dp_debugfs_init() to dpu_kms_debugfs_init() > > 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 2ee70072a1b4..a54f7d373f14 100644 > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > @@ -193,6 +193,10 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor) > if (!p) > return -EINVAL; > > + /* Only create one set of debugfs per DP instance */ I would change this to DPU now instead of DP, but apart from that, Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> > + if (minor->type != DRM_MINOR_PRIMARY) > + return 0; > + > dev = dpu_kms->dev; > priv = dev->dev_private; >
On Fri, 17 Dec 2021 at 03:19, Bjorn Andersson <bjorn.andersson@linaro.org> wrote: > > 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> > --- > > Changes since v1: > - Moved the check up from msm_dp_debugfs_init() to dpu_kms_debugfs_init() > > 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 2ee70072a1b4..a54f7d373f14 100644 > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > @@ -193,6 +193,10 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor) > if (!p) > return -EINVAL; > > + /* Only create one set of debugfs per DP instance */ The comment is misleading. Could you please fix it? > + if (minor->type != DRM_MINOR_PRIMARY) > + return 0; > + > dev = dpu_kms->dev; > priv = dev->dev_private; > > -- > 2.33.1 >
On Mon 20 Dec 15:53 PST 2021, Dmitry Baryshkov wrote: > On Fri, 17 Dec 2021 at 03:19, Bjorn Andersson > <bjorn.andersson@linaro.org> wrote: > > > > 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> > > --- > > > > Changes since v1: > > - Moved the check up from msm_dp_debugfs_init() to dpu_kms_debugfs_init() > > > > 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 2ee70072a1b4..a54f7d373f14 100644 > > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > > @@ -193,6 +193,10 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor) > > if (!p) > > return -EINVAL; > > > > + /* Only create one set of debugfs per DP instance */ > > The comment is misleading. Could you please fix it? > I agree, and as Abhinav pointed out I didn't update $subject fully either. Will resubmit. Regards, Bjorn > > + if (minor->type != DRM_MINOR_PRIMARY) > > + return 0; > > + > > dev = dpu_kms->dev; > > priv = dev->dev_private; > > > > -- > > 2.33.1 > > > > > -- > With best wishes > Dmitry
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c index 2ee70072a1b4..a54f7d373f14 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c @@ -193,6 +193,10 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor) if (!p) return -EINVAL; + /* Only create one set of debugfs per DP instance */ + if (minor->type != DRM_MINOR_PRIMARY) + return 0; + dev = dpu_kms->dev; priv = dev->dev_private;
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> --- Changes since v1: - Moved the check up from msm_dp_debugfs_init() to dpu_kms_debugfs_init() drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 4 ++++ 1 file changed, 4 insertions(+)