gpu: nvgpu: improve sync create/destroy logic

This change improves the aggressive sync creation
& destruction logic to avoid lock contention in
the submit path. It does the following:

1) Removes the global sync destruction (channel)
threshold, and adds a per-platform parameter.

2) Avoids lock contention in the clean-up/submit
path when aggressive sync destruction is disabled.

3) Creates sync object at gpfifo
allocation time (as long as we are not in aggressive
sync destroy mode), to enable faster first submits

Bug 1795076

Change-Id: Ifdb680100b08d00f37338063355bb2123ceb1b9f
Signed-off-by: Sachit Kadle <skadle@nvidia.com>
Reviewed-on: http://git-master/r/1202425
(cherry picked from commit ac0978711943a59c6f28c98c76b10759e0bff610)
Reviewed-on: http://git-master/r/1202427
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c b/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c
index b260b3ac..dc898226 100644
--- a/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c
+++ b/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c
@@ -49,6 +49,7 @@ static int gk20a_tegra_probe(struct device *dev)
 
 struct gk20a_platform vgpu_tegra_platform = {
         .has_syncpoints = true,
+        .aggressive_sync_destroy_thresh = 64,
 
         /* power management configuration */
         .can_railgate           = false,