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drm/i915: Record space required for breadcrumb emission

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In the next patch, we will use deferred breadcrumb emission. That requires
reserving sufficient space in the ringbuffer to emit the breadcrumb, which
first requires us to know how large the breadcrumb is.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-28-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2016-10-28 13:58:51 +01:00
parent 9b81d556b1
commit 98f29e8d90
4 changed files with 35 additions and 2 deletions
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6
drivers/gpu/drm/i915/intel_lrc.c
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@@ -1590,6 +1590,8 @@ static int gen8_emit_breadcrumb(struct drm_i915_gem_request *request)
return intel_logical_ring_advance(request);
}
static const int gen8_emit_breadcrumb_sz = 6 + WA_TAIL_DWORDS;
static int gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request)
{
struct intel_ring *ring = request->ring;
@@ -1621,6 +1623,8 @@ static int gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request)
return intel_logical_ring_advance(request);
}
static const int gen8_emit_breadcrumb_render_sz = 8 + WA_TAIL_DWORDS;
static int gen8_init_rcs_context(struct drm_i915_gem_request *req)
{
int ret;
@@ -1695,6 +1699,7 @@ logical_ring_default_vfuncs(struct intel_engine_cs *engine)
engine->reset_hw = reset_common_ring;
engine->emit_flush = gen8_emit_flush;
engine->emit_breadcrumb = gen8_emit_breadcrumb;
engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_sz;
engine->submit_request = execlists_submit_request;
engine->irq_enable = gen8_logical_ring_enable_irq;
@@ -1817,6 +1822,7 @@ int logical_render_ring_init(struct intel_engine_cs *engine)
engine->init_context = gen8_init_rcs_context;
engine->emit_flush = gen8_emit_flush_render;
engine->emit_breadcrumb = gen8_emit_breadcrumb_render;
engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_render_sz;
ret = intel_engine_create_scratch(engine, 4096);
if (ret)