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gpu: nvgpu: create sync_fence only if needed

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Currently, we create sync_fence (from nvhost_sync_create_fence())
for every submit
But not all submits request for a sync_fence.

Also, nvhost_sync_create_fence() API takes about 1/3rd of the total
submit path.

Hence to optimize, we can allocate sync_fence
only when user explicitly asks for it using
(NVGPU_SUBMIT_GPFIFO_FLAGS_FENCE_GET &&
NVGPU_SUBMIT_GPFIFO_FLAGS_SYNC_FENCE)

Also, in CDE path from gk20a_prepare_compressible_read(),
we reuse existing fence stored in "state" and that can
result into not returning sync_fence_fd when user asked
for it
Hence, force allocation of sync_fence when job submission
comes from CDE path

Bug 200141116

Change-Id: Ia921701bf0e2432d6b8a5e8b7d91160e7f52db1e
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/812845
(cherry picked from commit 5fd47015eeed00352cc8473eff969a66c94fee98)
Reviewed-on: http://git-master/r/837662
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
This commit is contained in:
Deepak Nibade
2015-10-07 16:20:07 +05:30
committed by Sachin Nikam
parent 937de14907
commit 52753b51f1
7 changed files with 54 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.h
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@@ -3,7 +3,7 @@
*
* GK20A Channel Synchronization Abstraction
*
* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2014-2015, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -54,7 +54,8 @@ struct gk20a_channel_sync {
*/
int (*incr)(struct gk20a_channel_sync *s,
struct priv_cmd_entry **entry,
struct gk20a_fence **fence);
struct gk20a_fence **fence,
bool need_sync_fence);
/* Increment syncpoint/semaphore, preceded by a wfi.
* Returns
@@ -76,7 +77,8 @@ struct gk20a_channel_sync {
int wait_fence_fd,
struct priv_cmd_entry **entry,
struct gk20a_fence **fence,
bool wfi);
bool wfi,
bool need_sync_fence);
/* Reset the channel syncpoint/semaphore. */
void (*set_min_eq_max)(struct gk20a_channel_sync *s);