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gpu: nvgpu: hal for timestamps correlation

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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
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Aparna Das <aparnad@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Thomas Fleury
2017-04-27 11:28:27 -07:00
committed by mobile promotions
parent 70f507eec7
commit 56f56b5cd9
9 changed files with 160 additions and 50 deletions
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18
include/linux/tegra_vgpu.h
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@@ -106,6 +106,7 @@ enum {
TEGRA_VGPU_CMD_GET_GPU_FREQ_TABLE = 70,
TEGRA_VGPU_CMD_CAP_GPU_CLK_RATE = 71,
TEGRA_VGPU_CMD_PROF_MGT = 72,
TEGRA_VGPU_CMD_GET_TIMESTAMPS_ZIPPER = 74,
};
struct tegra_vgpu_connect_params {
@@ -405,6 +406,22 @@ struct tegra_vgpu_read_ptimer_params {
u64 time;
};
#define TEGRA_VGPU_GET_TIMESTAMPS_ZIPPER_MAX_COUNT 16
#define TEGRA_VGPU_GET_TIMESTAMPS_ZIPPER_SRC_ID_TSC 1
struct tegra_vgpu_get_timestamps_zipper_params {
/* timestamp pairs */
struct {
/* gpu timestamp value */
u64 cpu_timestamp;
/* raw GPU counter (PTIMER) value */
u64 gpu_timestamp;
} samples[TEGRA_VGPU_GET_TIMESTAMPS_ZIPPER_MAX_COUNT];
/* number of pairs to read */
u32 count;
/* cpu clock source id */
u32 source_id;
};
struct tegra_vgpu_set_powergate_params {
u32 mode;
};
@@ -541,6 +558,7 @@ struct tegra_vgpu_cmd_msg {
struct tegra_vgpu_clear_sm_error_state clear_sm_error_state;
struct tegra_vgpu_get_gpu_freq_table_params get_gpu_freq_table;
struct tegra_vgpu_prof_mgt_params prof_management;
struct tegra_vgpu_get_timestamps_zipper_params get_timestamps_zipper;
char padding[192];
} params;
};