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gpu: nvgpu: Initial MAP_BUFFER_BATCH implementation

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Add batch support for mapping and unmapping. Batching essentially
helps transform some per-map/unmap overhead to per-batch overhead,
namely gk20a_busy()/gk20a_idle() calls, GPU L2 flushes, and GPU TLB
invalidates. Batching with size 64 has been measured to yield >20x
speed-up in low-level fixed-address mapping microbenchmarks.

Bug 1614735
Bug 1623949

Change-Id: Ie22b9caea5a7c3fc68a968d1b7f8488dfce72085
Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-on: http://git-master/r/733231
(cherry picked from commit de4a7cfb93e8228a4a0c6a2815755a8df4531c91)
Reviewed-on: http://git-master/r/763812
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Sami Kiminki
2015-04-20 18:12:22 +03:00
committed by Terje Bergstrom
parent ae7b988b0d
commit e7ba93fefb
9 changed files with 244 additions and 45 deletions
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2
drivers/gpu/nvgpu/gk20a/gk20a.c
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@@ -2033,6 +2033,8 @@ int gk20a_init_gpu_characteristics(struct gk20a *g)
gpu->cbc_cache_line_size = g->gr.cacheline_size;
gpu->cbc_comptags_per_line = g->gr.comptags_per_cacheline;
gpu->map_buffer_batch_limit = 256;
return 0;
}