linux-kernel - [RFC PATCH 0/2] drm: use dynamic

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Message-Id: <20201204035318.332419-1-jim.cromie@gmail.com>
Date:   Thu,  3 Dec 2020 20:53:16 -0700
From:   Jim Cromie <jim.cromie@...il.com>
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     jbaron@...mai.com, Jim Cromie <jim.cromie@...il.com>
Subject: [RFC PATCH 0/2] drm: use dynamic_debug

hello gentle readers,

These 2 rfc patches convert part of drm-world to use dynamic debug.

1st one addresses drm.debug category based logging.  If DYNAMIC_DEBUG
is configured, then CONFIG_DRM_USE_DYNAMIC_DEBUG controls whether
dynamic-debug is used to avoid runtime costs of drm_debug_enabled().
We require CONFIG_JUMP_LABEL too, since we are selling its
optimization.

This change adds many new callsites to /proc/dynamic_debug/control;
~300 in drm, ~200 in drm_kms_helper, as well as ~1500 in i915 driver,
and ~3200 in amdgpu.  So there are substantial implications here.

2nd one is for i915, which I have in my laptop.  `grep pr_debug` found
~90 callsites with a meaningful format-prefix-string, to demonstrate
use of "format ^prefix" to control user categorized debugs.

Jim Cromie (2):
  drm: RFC add choice to use dynamic debug in drm-debug
  i915: POC use dynamic_debug_exec_queries to control pr_debugs in gvt

 drivers/gpu/drm/Kconfig            | 13 +++++
 drivers/gpu/drm/drm_print.c        | 75 ++++++++++++++++++++++--
 drivers/gpu/drm/i915/gvt/Makefile  |  1 +
 drivers/gpu/drm/i915/i915_params.c | 74 ++++++++++++++++++++++++
 include/drm/drm_print.h            | 92 ++++++++++++++++++++++--------
 5 files changed, 228 insertions(+), 27 deletions(-)

-- 
2.28.0