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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>
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
/*
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* Copyright (c) 2011-2017, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CTRL_GK20A_H
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#define CTRL_GK20A_H
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#include <linux/fs.h>
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#include <linux/file.h>
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struct nvgpu_cpu_time_correlation_sample {
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u64 cpu_timestamp;
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u64 gpu_timestamp;
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};
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int gk20a_ctrl_dev_open(struct inode *inode, struct file *filp);
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int gk20a_ctrl_dev_release(struct inode *inode, struct file *filp);
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long gk20a_ctrl_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
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int gk20a_get_timestamps_zipper(struct gk20a *g,
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u32 source_id, u32 count,
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struct nvgpu_cpu_time_correlation_sample *samples);
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#endif /* CTRL_GK20A_H */
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