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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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drivers/gpu/drm/i915/intel_ringbuffer.h
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@@ -256,6 +256,7 @@ struct intel_engine_cs {
#define I915_DISPATCH_PINNED BIT(1)
#define I915_DISPATCH_RS BIT(2)
int (*emit_breadcrumb)(struct drm_i915_gem_request *req);
int emit_breadcrumb_sz;
/* Pass the request to the hardware queue (e.g. directly into
* the legacy ringbuffer or to the end of an execlist).