[Intel-gfx] [PATCH v7 00/11] Enable i915 perf stream for Haswell OA unit

[Robert Bragg]

Rebased on nightly, including recent review updates (CI wasn't happy picking up
the replies updating individual patches).

This also reverts back to pinning the context upfront when opening a stream for
a single context, instead of hooking into pinning and updating OACONTROL on the
fly.

Chris has repeatedly suggested he'd prefer to have the driver work with an
upfront pin, as it used to, instead of with the hook. It was changed last time
based on feedback considering some concern with the shrinker. At least from
inspection it does /seem/ safe to assume a pinned vma will reliably block the
shrinker from freeing ctx pages and the shrinker itself doesn't unpin things.
I'm not fully certain of the interaction with the _gem.c _context_lost() code
path which aims to unpin last_context. At least the code is a little simpler
this way, so maybe if Daniel is happy that his original concern was overly
cautious (or no longer an issue with the latest code), then this change is ok.

- Robert

Robert Bragg (11):
  drm/i915: Add i915 perf infrastructure
  drm/i915: rename OACONTROL GEN7_OACONTROL
  drm/i915: return EACCES for check_cmd() failures
  drm/i915: don't whitelist oacontrol in cmd parser
  drm/i915: Add 'render basic' Haswell OA unit config
  drm/i915: Enable i915 perf stream for Haswell OA unit
  drm/i915: advertise available metrics via sysfs
  drm/i915: Add dev.i915.perf_stream_paranoid sysctl option
  drm/i915: add oa_event_min_timer_exponent sysctl
  drm/i915: Add more Haswell OA metric sets
  drm/i915: Add a kerneldoc summary for i915_perf.c

 drivers/gpu/drm/i915/Makefile          |    4 +
 drivers/gpu/drm/i915/gvt/handlers.c    |    2 +-
 drivers/gpu/drm/i915/i915_cmd_parser.c |   45 +-
 drivers/gpu/drm/i915/i915_drv.c        |    9 +
 drivers/gpu/drm/i915/i915_drv.h        |  155 +++
 drivers/gpu/drm/i915/i915_oa_hsw.c     |  752 ++++++++++++++
 drivers/gpu/drm/i915/i915_oa_hsw.h     |   38 +
 drivers/gpu/drm/i915/i915_perf.c       | 1689 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h        |  340 ++++++-
 include/uapi/drm/i915_drm.h            |  133 +++
 10 files changed, 3127 insertions(+), 40 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/i915_oa_hsw.c
 create mode 100644 drivers/gpu/drm/i915/i915_oa_hsw.h
 create mode 100644 drivers/gpu/drm/i915/i915_perf.c

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2.10.1