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drm/i915: Define an engine class enum for the uABI

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We want to be able to report back to userspace details about an engine's
class, and in return for userspace to be able to request actions
regarding certain classes of engines. To isolate the uABI from any
variations between hw generations, we define an abstract class for the
engines and internally map onto the hw.

v2: Remove MAX from the uABI; keep it internal if we need it, but don't
let userspace make the mistake of using it themselves.
v3: s/OTHER/INVALID/
  The use of OTHER is ill-defined, so remove it from the uABI as any
  future new type of engine can define a class to suit it. But keep a
  reserved value for an invalid class, so that we can always
  unambiguously express when something doesn't belong to the
  classification.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> #v2
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171110142634.10551-1-chris@chris-wilson.co.uk
This commit is contained in:
Tvrtko Ursulin
2017-11-10 14:26:27 +00:00
committed by Chris Wilson
parent 9511ce1ce7
commit 1803fcbca2
3 changed files with 29 additions and 2 deletions
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5
drivers/gpu/drm/i915/intel_ringbuffer.h
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@@ -289,11 +289,14 @@ struct intel_engine_execlists {
struct intel_engine_cs {
struct drm_i915_private *i915;
char name[INTEL_ENGINE_CS_MAX_NAME];
enum intel_engine_id id;
unsigned int uabi_id;
unsigned int hw_id;
unsigned int guc_id;
u8 uabi_id;
u8 uabi_class;
u8 class;
u8 instance;
u32 context_size;