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drm/i915: Extend I915_CONTEXT_PARAM_SSEU to support local ctx->engine[]

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Allow the user to specify a local engine index (as opposed to
class:index) that they can use to refer to a preset engine inside the
ctx->engine[] array defined by an earlier I915_CONTEXT_PARAM_ENGINES.
This will be useful for setting SSEU parameters on virtual engines that
are local to the context and do not have a valid global class:instance
lookup.

Note that due to the ambiguity in using class:instance with
ctx->engines[], if a user supplied engine map is active the user must
specify the engine to alter by its index into the ctx->engines[].

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190521211134.16117-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-05-21 22:11:27 +01:00
parent 976b55f0e1
commit e620f7b3a2
2 changed files with 22 additions and 5 deletions
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3
include/uapi/drm/i915_drm.h
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@@ -1576,9 +1576,10 @@ struct drm_i915_gem_context_param_sseu {
struct i915_engine_class_instance engine;
/*
* Unused for now. Must be cleared to zero.
* Unknown flags must be cleared to zero.
*/
__u32 flags;
#define I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX (1u << 0)
/*
* Mask of slices to enable for the context. Valid values are a subset