diff options
author | Thomas Fleury <tfleury@nvidia.com> | 2017-04-27 14:28:27 -0400 |
---|---|---|
committer | mobile promotions <svcmobile_promotions@nvidia.com> | 2017-06-15 14:53:10 -0400 |
commit | 741e5c45179db066ddf5bed0be6f36e4d0d4010e (patch) | |
tree | 815f83070ae0fcf37a7b234caf8a2f86997f99bb /drivers/gpu/nvgpu/gk20a/bus_gk20a.h | |
parent | 77e2cbab237637f71367df25384164b8c936a31a (diff) |
gpu: nvgpu: hal for timestamps correlation
In order to perform timestamps correlation for FECS
traces, we need to collect GPU / GPU timestamps
samples. In virtualization case, it is possible for
a guest to get GPU timestamps by using read_ptimer.
However, if the CPU timestamp is read on guest side,
and the GPU timestamp is read on vm-server side,
then it introduces some latency that will create an
artificial offset for GPU timestamps (~2 us in
average). For better CPU / GPU timestamps correlation,
Added a command to collect all timestamps on vm-server
side.
Bug 1900475
Change-Id: Idfdc6ae4c16c501dc5e00053a5b75932c55148d6
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: http://git-master/r/1472447
(cherry picked from commit 56f56b5cd9d2e75cf7d2613b5e115bfebdbee0ce)
Reviewed-on: http://git-master/r/1489183
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Diffstat (limited to 'drivers/gpu/nvgpu/gk20a/bus_gk20a.h')
-rw-r--r-- | drivers/gpu/nvgpu/gk20a/bus_gk20a.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/nvgpu/gk20a/bus_gk20a.h b/drivers/gpu/nvgpu/gk20a/bus_gk20a.h index 72710c35..088c385e 100644 --- a/drivers/gpu/nvgpu/gk20a/bus_gk20a.h +++ b/drivers/gpu/nvgpu/gk20a/bus_gk20a.h | |||
@@ -22,10 +22,19 @@ struct gk20a; | |||
22 | struct gpu_ops; | 22 | struct gpu_ops; |
23 | struct nvgpu_mem; | 23 | struct nvgpu_mem; |
24 | 24 | ||
25 | struct nvgpu_cpu_time_correlation_sample { | ||
26 | u64 cpu_timestamp; | ||
27 | u64 gpu_timestamp; | ||
28 | }; | ||
29 | |||
25 | void gk20a_init_bus(struct gpu_ops *gops); | 30 | void gk20a_init_bus(struct gpu_ops *gops); |
26 | 31 | ||
27 | void gk20a_bus_isr(struct gk20a *g); | 32 | void gk20a_bus_isr(struct gk20a *g); |
28 | int gk20a_read_ptimer(struct gk20a *g, u64 *value); | 33 | int gk20a_read_ptimer(struct gk20a *g, u64 *value); |
29 | void gk20a_bus_init_hw(struct gk20a *g); | 34 | void gk20a_bus_init_hw(struct gk20a *g); |
30 | 35 | ||
36 | int gk20a_get_timestamps_zipper(struct gk20a *g, | ||
37 | u32 source_id, u32 count, | ||
38 | struct nvgpu_cpu_time_correlation_sample *samples); | ||
39 | |||
31 | #endif /* GK20A_H */ | 40 | #endif /* GK20A_H */ |