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drm/i915/guc: Prepare for nonblocking execbuf submission

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Currently the presumption is that the request construction and its
submission to the GuC are all under the same holding of struct_mutex. We
wish to relax this to separate the request construction and the later
submission to the GuC. This requires us to reserve some space in the
GuC command queue for the future submission. For flexibility to handle
out-of-order request submission we do not preallocate the next slot in
the GuC command queue during request construction, just ensuring that
there is enough space later.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20160909131201.16673-17-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2016-09-09 14:11:57 +01:00
parent a2bc4695bb
commit dadd481bfe
2 changed files with 25 additions and 12 deletions
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2
drivers/gpu/drm/i915/intel_guc.h
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@@ -78,9 +78,11 @@ struct i915_guc_client {
uint16_t doorbell_id;
uint16_t padding[3]; /* Maintain alignment */
spinlock_t wq_lock;
uint32_t wq_offset;
uint32_t wq_size;
uint32_t wq_tail;
uint32_t wq_rsvd;
uint32_t no_wq_space;
uint32_t b_fail;
int retcode;