[PATCH v5 00/13] drm/trace: Mirror DRM debug logs to tracefs

[Sean Paul]

From: Sean Paul <seanpaul at chromium.org>

This series is the latest in my journey to create a lightweight,
always-on "flight recorder" (name credit Weston) of drm logs. This
incarnation uses a trace_array to keep logs in memory exposed through
tracefs. Users and distros can enable drm logs by using the drm.trace
module parameter to choose the debug categories they are interested in.

The set has ballooned a little bit since the last version. Reason being
is that I decided to return true from drm_debug_enabled if trace was
enabled. This should make it easier and more seamless for driver
developers to use the correct interface, but meant I needed to audit all
uses of drm_debug_enabled and drm_debug_printer.

Out of all those calls, there are 3 situations which arose:
1- The logs should only go to syslog:
	I've converted these to use the drm_debug_syslog variant of
	enable check/printer.

2- The logs should go to both syslog/trace, but were using pr_debug():
	I've converted these to use the proper drm logging helper. In
	cases which used a drm_printer I've had to use a new
	drm_debug_category_printer to ensure they are routed correctly.

3- The logs should go to both syslog/trace and are using drm logging fns:
   	These are untouched and should be routed to the appropriate
	place(s)


Sean Paul (13):
  drm/mipi_dbi: Convert pr_debug calls to DRM_DEBUG_DRIVER
  drm/sil164: Convert dev_printk to drm_dev_dbg
  drm/i915/utils: Replace dev_printk with drm helpers
  drm/msm/dpu: Replace definitions for dpu debug macros
  drm/print: rename drm_debug* to be more syslog-centric
  drm/amd: Gate i2c transaction logs on drm_debug_syslog
  drm/etnaviv: Change buffer dump checks to target syslog
  drm/nouveau: Change debug checks to specifically target syslog
  drm/i915: Change infoframe debug checks to specify syslog
  drm/print: Add drm_debug_category_printer
  drm/mst: Convert debug printers to debug category printers
  drm/i915: Use debug category printer for welcome message
  drm/print: Add tracefs support to the drm logging helpers

 Documentation/gpu/drm-uapi.rst               |   6 +
 drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c   |   4 +-
 drivers/gpu/drm/drm_dp_mst_topology.c        |   9 +-
 drivers/gpu/drm/drm_drv.c                    |   3 +
 drivers/gpu/drm/drm_mipi_dbi.c               |   8 +-
 drivers/gpu/drm/drm_print.c                  | 228 ++++++++++++++++---
 drivers/gpu/drm/etnaviv/etnaviv_buffer.c     |   8 +-
 drivers/gpu/drm/i2c/sil164_drv.c             |  12 +-
 drivers/gpu/drm/i915/display/intel_display.c |   4 +-
 drivers/gpu/drm/i915/i915_drv.c              |   3 +-
 drivers/gpu/drm/i915/i915_utils.c            |   5 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h      |  20 +-
 drivers/gpu/drm/nouveau/dispnv50/disp.h      |   4 +-
 drivers/gpu/drm/nouveau/nouveau_drv.h        |   4 +-
 include/drm/drm_print.h                      |  96 +++++++-
 15 files changed, 318 insertions(+), 96 deletions(-)

-- 
Sean Paul, Software Engineer, Google / Chromium OS