1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2024 Intel Corporation 4 */ 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 calculating 17 * npu_busy_time_us difference between two timepoints (i.e. measuring the time 18 * that the NPU was active during some workload) or monitoring utilization percentage 19 * by reading npu_busy_time_us periodically. 20 * 21 * When reading the value periodically, it shouldn't be read too often as it may have 22 * an impact on job submission performance. Recommended period is 1 second. 23 */ 24 static ssize_t 25 npu_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 40 static DEVICE_ATTR_RO(npu_busy_time_us); 41 42 static struct attribute *ivpu_dev_attrs[] = { 43 &dev_attr_npu_busy_time_us.attr, 44 NULL, 45 }; 46 47 static struct attribute_group ivpu_dev_attr_group = { 48 .attrs = ivpu_dev_attrs, 49 }; 50 51 void 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