drivers/accel/ivpu/ivpu_sysfs.c

   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_drv.h"
  10 #include "ivpu_fw.h"
  11 #include "ivpu_hw.h"
  12 #include "ivpu_sysfs.h"
  13
  14 /*
  15  * npu_busy_time_us is the time that the device spent executing jobs.
  16  * The time is counted when and only when there are jobs submitted to firmware.
  17  *
  18  * This time can be used to measure the utilization of NPU, either by calculating
  19  * npu_busy_time_us difference between two timepoints (i.e. measuring the time
  20  * that the NPU was active during some workload) or monitoring utilization percentage
  21  * by reading npu_busy_time_us periodically.
  22  *
  23  * When reading the value periodically, it shouldn't be read too often as it may have
  24  * an impact on job submission performance. Recommended period is 1 second.
  25  */
  26 static ssize_t
  27 npu_busy_time_us_show(struct device *dev, struct device_attribute *attr, char *buf)
  28 {
  29         struct drm_device *drm = dev_get_drvdata(dev);
  30         struct ivpu_device *vdev = to_ivpu_device(drm);
  31         ktime_t total, now = 0;
  32
  33         xa_lock(&vdev->submitted_jobs_xa);
  34         total = vdev->busy_time;
  35         if (!xa_empty(&vdev->submitted_jobs_xa))
  36                 now = ktime_sub(ktime_get(), vdev->busy_start_ts);
  37         xa_unlock(&vdev->submitted_jobs_xa);
  38
  39         return sysfs_emit(buf, "%lld\n", ktime_to_us(ktime_add(total, now)));
  40 }
  41
  42 static DEVICE_ATTR_RO(npu_busy_time_us);
  43
  44 /**
  45  * DOC: sched_mode
  46  *
  47  * The sched_mode is used to report current NPU scheduling mode.
  48  *
  49  * It returns following strings:
  50  * - "HW"               - Hardware Scheduler mode
  51  * - "OS"               - Operating System Scheduler mode
  52  *
  53  */
  54 static ssize_t
  55 sched_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
  56 {
  57         struct drm_device *drm = dev_get_drvdata(dev);
  58         struct ivpu_device *vdev = to_ivpu_device(drm);
  59
  60         return sysfs_emit(buf, "%s\n", vdev->fw->sched_mode ? "HW" : "OS");
  61 }
  62
  63 static DEVICE_ATTR_RO(sched_mode);
  64
  65 static struct attribute *ivpu_dev_attrs[] = {
  66         &dev_attr_npu_busy_time_us.attr,
  67         &dev_attr_sched_mode.attr,
  68         NULL,
  69 };
  70
  71 static struct attribute_group ivpu_dev_attr_group = {
  72         .attrs = ivpu_dev_attrs,
  73 };
  74
  75 void ivpu_sysfs_init(struct ivpu_device *vdev)
  76 {
  77         int ret;
  78
  79         ret = devm_device_add_group(vdev->drm.dev, &ivpu_dev_attr_group);
  80         if (ret)
  81                 ivpu_warn(vdev, "Failed to add group to device, ret %d", ret);
  82 }