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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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8
drivers/gpu/nvgpu/vgpu/mm_vgpu.c
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@@ -66,7 +66,8 @@ static u64 vgpu_locked_gmmu_map(struct vm_gk20a *vm,
u32 flags,
int rw_flag,
bool clear_ctags,
bool sparse)
bool sparse,
struct vm_gk20a_mapping_batch *batch)
{
int err = 0;
struct device *d = dev_from_vm(vm);
@@ -130,7 +131,8 @@ static void vgpu_locked_gmmu_unmap(struct vm_gk20a *vm,
int pgsz_idx,
bool va_allocated,
int rw_flag,
bool sparse)
bool sparse,
struct vm_gk20a_mapping_batch *batch)
{
struct gk20a *g = gk20a_from_vm(vm);
struct gk20a_platform *platform = gk20a_get_platform(g->dev);
@@ -182,7 +184,7 @@ static void vgpu_vm_remove_support(struct vm_gk20a *vm)
while (node) {
mapped_buffer =
container_of(node, struct mapped_buffer_node, node);
gk20a_vm_unmap_locked(mapped_buffer);
gk20a_vm_unmap_locked(mapped_buffer, NULL);
node = rb_first(&vm->mapped_buffers);
}