gpu: nvgpu: Initial MAP_BUFFER_BATCH implementation

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>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index 9a183e44..fc2ed643 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -349,14 +349,16 @@ struct gpu_ops {
                                 u32 flags,
                                 int rw_flag,
                                 bool clear_ctags,
-                                bool sparse);
+                                bool sparse,
+                                struct vm_gk20a_mapping_batch *batch);
                 void (*gmmu_unmap)(struct vm_gk20a *vm,
                                 u64 vaddr,
                                 u64 size,
                                 int pgsz_idx,
                                 bool va_allocated,
                                 int rw_flag,
-                                bool sparse);
+                                bool sparse,
+                                struct vm_gk20a_mapping_batch *batch);
                 void (*vm_remove)(struct vm_gk20a *vm);
                 int (*vm_alloc_share)(struct gk20a_as_share *as_share,
                                       u32 flags);