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Starting from Gen11 the context descriptor format has been updated in the HW. The hw_id field has been considerably reduced in size and engine class and instance fields have been added. There is a slight name clashing issue because the field that we call hw_id is actually called SW Context ID in the specs for Gen11+. With the current size of the hw_id field we can have a maximum of 2k contexts at any time, but we could use the sw_counter field (which is sw defined) to increase that because the HW requirement is that engine_id + sw id + sw_counter is a unique number. GuC uses a similar method to support more contexts but does its tracking at lrc level. To avoid doing an implementation that will need to be reworked once GuC support lands, defer it for now and mark it as TODO. v2: rebased, add documentation, fix GEN11_ENGINE_INSTANCE_SHIFT v3: rebased, bring back lost code from i915_gem_context.c v4: make TODO comment more generic v5: be consistent with bit ordering, add extra checks (Chris) Cc: Oscar Mateo <oscar.mateo@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Reviewed-by: Oscar Mateo <oscar.mateo@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180302161501.28594-3-mika.kuoppala@linux.intel.com Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> |
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