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The driver tracks the time spent by NPU executing jobs and shares it through sysfs `npu_busy_time_us` file. It can be then used by user space applications to monitor device utilization. NPU is considered 'busy' starting with a first job submitted to firmware and ending when there is no more jobs pending/executing. Signed-off-by: Tomasz Rusinowicz <tomasz.rusinowicz@intel.com> Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240513120431.3187212-13-jacek.lawrynowicz@linux.intel.com
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2024 Intel Corporation
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include "ivpu_hw.h"
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#include "ivpu_sysfs.h"
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/*
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* npu_busy_time_us is the time that the device spent executing jobs.
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* The time is counted when and only when there are jobs submitted to firmware.
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*
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* This time can be used to measure the utilization of NPU, either by calculating
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* npu_busy_time_us difference between two timepoints (i.e. measuring the time
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* that the NPU was active during some workload) or monitoring utilization percentage
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* by reading npu_busy_time_us periodically.
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*
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* When reading the value periodically, it shouldn't be read too often as it may have
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* an impact on job submission performance. Recommended period is 1 second.
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*/
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static ssize_t
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npu_busy_time_us_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct drm_device *drm = dev_get_drvdata(dev);
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struct ivpu_device *vdev = to_ivpu_device(drm);
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ktime_t total, now = 0;
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xa_lock(&vdev->submitted_jobs_xa);
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total = vdev->busy_time;
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if (!xa_empty(&vdev->submitted_jobs_xa))
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now = ktime_sub(ktime_get(), vdev->busy_start_ts);
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xa_unlock(&vdev->submitted_jobs_xa);
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return sysfs_emit(buf, "%lld\n", ktime_to_us(ktime_add(total, now)));
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}
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static DEVICE_ATTR_RO(npu_busy_time_us);
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static struct attribute *ivpu_dev_attrs[] = {
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&dev_attr_npu_busy_time_us.attr,
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NULL,
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};
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static struct attribute_group ivpu_dev_attr_group = {
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.attrs = ivpu_dev_attrs,
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};
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void ivpu_sysfs_init(struct ivpu_device *vdev)
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{
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int ret;
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ret = devm_device_add_group(vdev->drm.dev, &ivpu_dev_attr_group);
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if (ret)
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ivpu_warn(vdev, "Failed to add group to device, ret %d", ret);
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}
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