linux-kernel - [PATCH 0/5] drm/komeda: Improve IRQ error event prints

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Date:   Mon, 21 Oct 2019 16:47:06 +0000
From:   Mihail Atanassov <Mihail.Atanassov@....com>
To:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC:     Mihail Atanassov <Mihail.Atanassov@....com>, nd <nd@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Sean Paul <sean@...rly.run>, Liviu Dudau <Liviu.Dudau@....com>,
        Brian Starkey <Brian.Starkey@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "james qian wang (Arm Technology China)" <james.qian.wang@....com>,
        "Lowry Li (Arm Technology China)" <Lowry.Li@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/5] drm/komeda: Improve IRQ error event prints

Hi everyone,

This is a smallish series that tries to remove some build-time
configurability in komeda and replace it with a debugfs control. Later
patches in the series add some extra functionality which I found useful
during my debugging sessions, so I figured I'd bake it in.

I've preserved the default behaviour as if CONFIG_KOMEDA_ERROR_PRINT
were enabled, so production kernels can have some feedback from the
driver when things are going south.

1: Introduce the err_verbosity debugfs node for komeda; this keeps the
   default of printing error events once per frame.
2: Drop CONFIG_KOMEDA_ERROR_PRINT since output can be disabled at
   runtime
3: Add a drm state dump on event. It's quite chatty so I left it only
   for error events; printing all that once per frame every vsync floods my
   serial terminal, so no info + state combination.
4: Add lower-severity categories to the event printer
5: Normally these events fire only once per pageflip, but sometimes it's
   useful to see them all as they come in.

These patches are overall quite tiny, and I was considering just
squashing them into one, but I opted to keep them separate for an easier
review experience; please let me know whether you prefer a single patch.
Thanks!

Mihail Atanassov (5):
  drm/komeda: Add debugfs node to control error verbosity
  drm/komeda: Remove CONFIG_KOMEDA_ERROR_PRINT
  drm/komeda: Optionally dump DRM state on interrupts
  drm/komeda: Add option to print WARN- and INFO-level IRQ events
  drm/komeda: add rate limiting disable to err_verbosity

 drivers/gpu/drm/arm/display/Kconfig           |  6 ----
 drivers/gpu/drm/arm/display/komeda/Makefile   |  5 ++--
 .../gpu/drm/arm/display/komeda/komeda_dev.c   |  4 +++
 .../gpu/drm/arm/display/komeda/komeda_dev.h   | 30 +++++++++++++++----
 .../gpu/drm/arm/display/komeda/komeda_event.c | 24 ++++++++++++---
 .../gpu/drm/arm/display/komeda/komeda_kms.c   |  2 +-
 6 files changed, 52 insertions(+), 19 deletions(-)

-- 
2.23.0