[Intel-gfx] [RFC 0/5] DRM logging tidy

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

I wasn't here at the beginnings of DRM so I might have gotten this wrong,
however the existance of DRM_NAME suggested to me that the intention was to
allow individual drivers to override it and get appropriate prefixes in their
log messages.

I can't see that any driver is using it like that but I still thought it would
be neat to do that. That way we could have our log messages look more
obviously ours. For example after this series we have:

 [i915] Memory usable by graphics device = 4096M
 [i915] VT-d active for gfx access
 [i915] Replacing VGA console driver
 [i915] ACPI BIOS requests an excessive sleep of 20000 ms, using 1500 ms instead
 [i915] Finished loading DMC firmware i915/skl_dmc_ver1_26.bin (v1.26)
 [i915] Disabling framebuffer compression (FBC) to prevent screen flicker with VT-d enabled
 [i915] GuC firmware load skipped
 [i915] Initialized i915 1.6.0 20161205 for 0000:00:02.0 on minor 0
 [i915] DRM_I915_DEBUG enabled
 [i915] DRM_I915_DEBUG_GEM enabled
 [i915] RC6 on

Previously all that was prefixed with "[drm]" which was OK but I think the
above is even better.

Also to consider is that recent drm_printk work has removed (it hardcoded)
DRM_NAME from DRM_ERROR and DRM_DEBUG macros, while leaving it with the rest
(DRM_INFO, NOTE and WARNING) creating a bit of a inconsistency.

This series also makes all the logging macros use drm_printk, but also
makes DRM_NAME passed in from the macro wrappers in all cases. So drivers
can override it regardless of the log level.

And finally, the series also removes a bit of redundant data from the debug
messages effectively converting this:

 [drm:edp_panel_off [i915]] Wait for panel power off time

Into this:

 [edp_panel_off [i915]] Wait for panel power off time

Which still has all the data in it.

Tvrtko Ursulin (5):
  drm/i915: Give our log messages our name
  drm: Respect driver set DRM_NAME in drm_printk
  drm: Respect driver set DRM_NAME in drm_dev_printk
  drm: Use drm_printk for all logging macros
  drm: Do not log driver prefix in debug messages

 drivers/gpu/drm/drm_drv.c       | 39 +++++++++++------
 drivers/gpu/drm/i915/i915_drv.c |  3 +-
 include/drm/drmP.h              | 94 ++++++++++++++++++++++++-----------------
 include/drm/drm_drv.h           | 11 ++---
 include/uapi/drm/i915_drm.h     |  3 ++
 5 files changed, 92 insertions(+), 58 deletions(-)

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2.7.4