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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2024 Intel Corporation4 */5 6#include <linux/device.h>7#include <linux/err.h>8 9#include "ivpu_hw.h"10#include "ivpu_sysfs.h"11 12/*13 * npu_busy_time_us is the time that the device spent executing jobs.14 * The time is counted when and only when there are jobs submitted to firmware.15 *16 * This time can be used to measure the utilization of NPU, either by calculating17 * npu_busy_time_us difference between two timepoints (i.e. measuring the time18 * that the NPU was active during some workload) or monitoring utilization percentage19 * by reading npu_busy_time_us periodically.20 *21 * When reading the value periodically, it shouldn't be read too often as it may have22 * an impact on job submission performance. Recommended period is 1 second.23 */24static ssize_t25npu_busy_time_us_show(struct device *dev, struct device_attribute *attr, char *buf)26{27 struct drm_device *drm = dev_get_drvdata(dev);28 struct ivpu_device *vdev = to_ivpu_device(drm);29 ktime_t total, now = 0;30 31 xa_lock(&vdev->submitted_jobs_xa);32 total = vdev->busy_time;33 if (!xa_empty(&vdev->submitted_jobs_xa))34 now = ktime_sub(ktime_get(), vdev->busy_start_ts);35 xa_unlock(&vdev->submitted_jobs_xa);36 37 return sysfs_emit(buf, "%lld\n", ktime_to_us(ktime_add(total, now)));38}39 40static DEVICE_ATTR_RO(npu_busy_time_us);41 42static struct attribute *ivpu_dev_attrs[] = {43 &dev_attr_npu_busy_time_us.attr,44 NULL,45};46 47static struct attribute_group ivpu_dev_attr_group = {48 .attrs = ivpu_dev_attrs,49};50 51void ivpu_sysfs_init(struct ivpu_device *vdev)52{53 int ret;54 55 ret = devm_device_add_group(vdev->drm.dev, &ivpu_dev_attr_group);56 if (ret)57 ivpu_warn(vdev, "Failed to add group to device, ret %d", ret);58}59