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Commit ae1250b9 authored by Oscar Mateo's avatar Oscar Mateo Committed by Daniel Vetter
Browse files

drm/i915/bdw: Write the tail pointer, LRC style 



Each logical ring context has the tail pointer in the context object,
so update it before submission.

v2: New namespace.

Signed-off-by: default avatarOscar Mateo <oscar.mateo@intel.com>
Reviewed-by: default avatarDamien Lespiau <damien.lespiau@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 84b790f8

drivers/gpu/drm/i915/intel_lrc.c

+19 −0
Original line number Diff line number Diff line
@@ -178,6 +178,21 @@ static void execlists_elsp_write(struct intel_engine_cs *ring, 
	gen6_gt_force_wake_put(dev_priv, FORCEWAKE_ALL);

}



static int execlists_ctx_write_tail(struct drm_i915_gem_object *ctx_obj, u32 tail)

{

	struct page *page;

	uint32_t *reg_state;



	page = i915_gem_object_get_page(ctx_obj, 1);

	reg_state = kmap_atomic(page);



	reg_state[CTX_RING_TAIL+1] = tail;



	kunmap_atomic(reg_state);



	return 0;

}



static int execlists_submit_context(struct intel_engine_cs *ring,

				    struct intel_context *to0, u32 tail0,

				    struct intel_context *to1, u32 tail1)
@@ -189,10 +204,14 @@ static int execlists_submit_context(struct intel_engine_cs *ring, 
	BUG_ON(!ctx_obj0);

	BUG_ON(!i915_gem_obj_is_pinned(ctx_obj0));



	execlists_ctx_write_tail(ctx_obj0, tail0);



	if (to1) {

		ctx_obj1 = to1->engine[ring->id].state;

		BUG_ON(!ctx_obj1);

		BUG_ON(!i915_gem_obj_is_pinned(ctx_obj1));



		execlists_ctx_write_tail(ctx_obj1, tail1);

	}



	execlists_elsp_write(ring, ctx_obj0, ctx_obj1);