[Intel-gfx] [PATCH 0/7] Per client engine busyness

[Tvrtko Ursulin]

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

Resurrect of the previosuly merged per client engine busyness patches. In a
nutshell it enables intel_gpu_top to be more top(1) like useful and show not
only physical GPU engine usage but per process view as well.

Example screen capture:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
intel-gpu-top -  906/ 955 MHz;    0% RC6;  5.30 Watts;      933 irqs/s

      IMC reads:     4414 MiB/s
     IMC writes:     3805 MiB/s

          ENGINE      BUSY                                      MI_SEMA MI_WAIT
     Render/3D/0   93.46% |████████████████████████████████▋  |      0%      0%
       Blitter/0    0.00% |                                   |      0%      0%
         Video/0    0.00% |                                   |      0%      0%
  VideoEnhance/0    0.00% |                                   |      0%      0%

  PID            NAME  Render/3D      Blitter        Video      VideoEnhance
 2733       neverball |██████▌     ||            ||            ||            |
 2047            Xorg |███▊        ||            ||            ||            |
 2737        glxgears |█▍          ||            ||            ||            |
 2128           xfwm4 |            ||            ||            ||            |
 2047            Xorg |            ||            ||            ||            |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Internally we track time spent on engines for each struct intel_context, both
for current and past contexts belonging to each open DRM file.

This can serve as a building block for several features from the wanted list:
smarter scheduler decisions, getrusage(2)-like per-GEM-context functionality
wanted by some customers, setrlimit(2) like controls, cgroups controller,
dynamic SSEU tuning, ...

To enable userspace access to the tracked data, we expose time spent on GPU per
client and per engine class in sysfs with a hierarchy like the below:

	# cd /sys/class/drm/card0/clients/
	# tree
	.
	├── 7
	│   ├── busy
	│   │   ├── 0
	│   │   ├── 1
	│   │   ├── 2
	│   │   └── 3
	│   ├── name
	│   └── pid
	├── 8
	│   ├── busy
	│   │   ├── 0
	│   │   ├── 1
	│   │   ├── 2
	│   │   └── 3
	│   ├── name
	│   └── pid
	└── 9
	    ├── busy
	    │   ├── 0
	    │   ├── 1
	    │   ├── 2
	    │   └── 3
	    ├── name
	    └── pid

Files in 'busy' directories are numbered using the engine class ABI values and
they contain accumulated nanoseconds each client spent on engines of a
respective class.

Tvrtko Ursulin (7):
  drm/i915: Expose list of clients in sysfs
  drm/i915: Update client name on context create
  drm/i915: Make GEM contexts track DRM clients
  drm/i915: Track runtime spent in closed and unreachable GEM contexts
  drm/i915: Track all user contexts per client
  drm/i915: Track context current active time
  drm/i915: Expose per-engine client busyness

 drivers/gpu/drm/i915/Makefile                 |   5 +-
 drivers/gpu/drm/i915/gem/i915_gem_context.c   |  61 ++-
 .../gpu/drm/i915/gem/i915_gem_context_types.h |  16 +-
 drivers/gpu/drm/i915/gt/intel_context.c       |  27 +-
 drivers/gpu/drm/i915/gt/intel_context.h       |  15 +-
 drivers/gpu/drm/i915/gt/intel_context_types.h |  24 +-
 .../drm/i915/gt/intel_execlists_submission.c  |  23 +-
 .../gpu/drm/i915/gt/intel_gt_clock_utils.c    |   4 +
 drivers/gpu/drm/i915/gt/intel_lrc.c           |  27 +-
 drivers/gpu/drm/i915/gt/intel_lrc.h           |  24 ++
 drivers/gpu/drm/i915/gt/selftest_lrc.c        |  10 +-
 drivers/gpu/drm/i915/i915_drm_client.c        | 365 ++++++++++++++++++
 drivers/gpu/drm/i915/i915_drm_client.h        | 123 ++++++
 drivers/gpu/drm/i915/i915_drv.c               |   6 +
 drivers/gpu/drm/i915/i915_drv.h               |   5 +
 drivers/gpu/drm/i915/i915_gem.c               |  21 +-
 drivers/gpu/drm/i915/i915_gpu_error.c         |  31 +-
 drivers/gpu/drm/i915/i915_gpu_error.h         |   2 +-
 drivers/gpu/drm/i915/i915_sysfs.c             |   8 +
 19 files changed, 716 insertions(+), 81 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/i915_drm_client.c
 create mode 100644 drivers/gpu/drm/i915/i915_drm_client.h

-- 
2.30.2