[Intel-gfx] [PATCH v2 0/3] drm/i915/guc/slpc: Implement waitboost for SLPC

Vinay Belgaumkar
2021-11-01T04:39:57Z

Waitboost is a legacy feature implemented in the Host Turbo algorithm. This
patch set implements it for the SLPC path. A "boost" happens when user
calls gem_wait ioctl on a submission that has not landed on HW yet. GT
frequency gets temporarily bumped to RP0 to allow the previous request
to finish quickly. We achieve this on SLPC by setting the min frequency,
SLPC will set that as the requested frequency.

The boost will occur through a worker thread that will be scheduled
when the required conditions are met.

Like before, boost frequency is configurable through sysfs, so we can
adjust it to any specific value as long as it is between [min, RP0].

v2: Add a worker thread to perform freq boost.

Cc: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>

Vinay Belgaumkar (3):
drm/i915/guc/slpc: Define and initialize boost frequency
drm/i915/guc/slpc: Add waitboost functionality for SLPC
drm/i915/guc/slpc: Update boost sysfs hooks for SLPC

drivers/gpu/drm/i915/gt/intel_rps.c | 73 +++++++++
drivers/gpu/drm/i915/gt/intel_rps.h | 3 +
drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c | 149 +++++++++++++++---
drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h | 3 +
.../gpu/drm/i915/gt/uc/intel_guc_slpc_types.h | 13 ++
drivers/gpu/drm/i915/i915_request.c | 2 +-
drivers/gpu/drm/i915/i915_sysfs.c | 19 +--
7 files changed, 222 insertions(+), 40 deletions(-)

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2.25.0