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gpu: nvgpu: add support for pre-allocated resources

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Add support for pre-allocation of job tracking resources
w/ new (extended) ioctl. Goal is to avoid dynamic memory
allocation in the submit path. This patch does the following:

1) Intoduces a new ioctl, NVGPU_IOCTL_CHANNEL_ALLOC_GPFIFO_EX,
which enables pre-allocation of tracking resources per job:
a) 2x priv_cmd_entry
b) 2x gk20a_fence

2) Implements circular ring buffer for job
tracking to avoid lock contention between producer
(submitter) and consumer (clean-up)

Bug 1795076

Change-Id: I6b52e5c575871107ff380f9a5790f440a6969347
Signed-off-by: Sachit Kadle <skadle@nvidia.com>
Reviewed-on: http://git-master/r/1203300
(cherry picked from commit 9fd270c22b860935dffe244753dabd87454bef39)
Reviewed-on: http://git-master/r/1223934
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Sachit Kadle
2016-08-15 14:32:39 -07:00
committed by mobile promotions
parent 63e8592e06
commit 733fb79b39
7 changed files with 463 additions and 66 deletions
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8
include/uapi/linux/nvgpu.h
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@@ -963,7 +963,13 @@ struct nvgpu_alloc_gpfifo_args {
__u32 num_entries;
#define NVGPU_ALLOC_GPFIFO_FLAGS_VPR_ENABLED (1 << 0) /* set owner channel of this gpfifo as a vpr channel */
__u32 flags;
};
struct nvgpu_alloc_gpfifo_ex_args {
__u32 num_entries;
__u32 num_inflight_jobs;
__u32 flags;
__u32 reserved[5];
};
struct gk20a_sync_pt_info {
@@ -1182,6 +1188,8 @@ struct nvgpu_preemption_mode_args {
_IOWR(NVGPU_IOCTL_MAGIC, 18, struct nvgpu_set_timeout_ex_args)
#define NVGPU_IOCTL_CHANNEL_ALLOC_GPFIFO \
_IOW(NVGPU_IOCTL_MAGIC, 100, struct nvgpu_alloc_gpfifo_args)
#define NVGPU_IOCTL_CHANNEL_ALLOC_GPFIFO_EX \
_IOW(NVGPU_IOCTL_MAGIC, 101, struct nvgpu_alloc_gpfifo_ex_args)
#define NVGPU_IOCTL_CHANNEL_WAIT \
_IOWR(NVGPU_IOCTL_MAGIC, 102, struct nvgpu_wait_args)
#define NVGPU_IOCTL_CHANNEL_CYCLE_STATS \