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gpu: nvgpu: add deterministic submit flag

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This change adds a new ioctl flag,
NVGPU_SUBMIT_GPFIFO_FLAGS_DETERMINISTIC, which indicates that a
gpfifo submission must exhibit deterministic behavior within the
kernel.

For submissions that require job tracking and also set
this flag, we require the channel to have previously
pre-allocated job tracking resources.

Bug 1795076

Change-Id: I0496a2513c6c683fcda161b32db9e7ee6712d45c
Signed-off-by: Sachit Kadle <skadle@nvidia.com>
Reviewed-on: http://git-master/r/1210527
(cherry picked from commit 0a36a0ce3a6cbe398931993e742fc928f7b2c0aa)
Reviewed-on: http://git-master/r/1223935
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Sachit Kadle
2016-08-30 20:23:31 -07:00
committed by mobile promotions
parent 733fb79b39
commit 418fc5338e
2 changed files with 11 additions and 0 deletions
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9
drivers/gpu/nvgpu/gk20a/channel_gk20a.c
View File

@@ -2628,6 +2628,15 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
!skip_buffer_refcounting;
if (need_job_tracking) {
/*
* If the submit is to have deterministic latency and
* job tracking is required, the channel must have
* pre-allocated resources. Otherwise, we fail the submit here
*/
if ((flags & NVGPU_SUBMIT_GPFIFO_FLAGS_DETERMINISTIC) &&
!channel_gk20a_is_prealloc_enabled(c))
return -EINVAL;
/* gk20a_channel_update releases this ref. */
err = gk20a_busy(g->dev);
if (err) {

2
include/uapi/linux/nvgpu.h
View File

@@ -994,6 +994,8 @@ struct nvgpu_fence {
#define NVGPU_SUBMIT_GPFIFO_FLAGS_SUPPRESS_WFI (1 << 4)
/* skip buffer refcounting during submit */
#define NVGPU_SUBMIT_GPFIFO_FLAGS_SKIP_BUFFER_REFCOUNTING (1 << 5)
/* submit should exhibit deterministic latency */
#define NVGPU_SUBMIT_GPFIFO_FLAGS_DETERMINISTIC (1 << 6)
struct nvgpu_submit_gpfifo_args {
__u64 gpfifo;