tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2024-2025 Intel Corporation
4 */
5
6#include <linux/device.h>
7#include <linux/err.h>
8#include <linux/pm_runtime.h>
9#include <linux/units.h>
10
11#include "ivpu_drv.h"
12#include "ivpu_gem.h"
13#include "ivpu_fw.h"
14#include "ivpu_hw.h"
15#include "ivpu_sysfs.h"
16
17/**
18 * DOC: npu_busy_time_us
19 *
20 * npu_busy_time_us is the time that the device spent executing jobs.
21 * The time is counted when and only when there are jobs submitted to firmware.
22 *
23 * This time can be used to measure the utilization of NPU, either by calculating
24 * npu_busy_time_us difference between two timepoints (i.e. measuring the time
25 * that the NPU was active during some workload) or monitoring utilization percentage
26 * by reading npu_busy_time_us periodically.
27 *
28 * When reading the value periodically, it shouldn't be read too often as it may have
29 * an impact on job submission performance. Recommended period is 1 second.
30 */
31static ssize_t
32npu_busy_time_us_show(struct device *dev, struct device_attribute *attr, char *buf)
33{
34 struct drm_device *drm = dev_get_drvdata(dev);
35 struct ivpu_device *vdev = to_ivpu_device(drm);
36 ktime_t total, now = 0;
37
38 mutex_lock(&vdev->submitted_jobs_lock);
39
40 total = vdev->busy_time;
41 if (!xa_empty(&vdev->submitted_jobs_xa))
42 now = ktime_sub(ktime_get(), vdev->busy_start_ts);
43 mutex_unlock(&vdev->submitted_jobs_lock);
44
45 return sysfs_emit(buf, "%lld\n", ktime_to_us(ktime_add(total, now)));
46}
47
48static DEVICE_ATTR_RO(npu_busy_time_us);
49
50/**
51 * DOC: npu_memory_utilization
52 *
53 * The npu_memory_utilization is used to report in bytes a current NPU memory utilization.
54 *
55 */
56static ssize_t
57npu_memory_utilization_show(struct device *dev, struct device_attribute *attr, char *buf)
58{
59 struct drm_device *drm = dev_get_drvdata(dev);
60 struct ivpu_device *vdev = to_ivpu_device(drm);
61 struct ivpu_bo *bo;
62 u64 total_npu_memory = 0;
63
64 mutex_lock(&vdev->bo_list_lock);
65 list_for_each_entry(bo, &vdev->bo_list, bo_list_node)
66 total_npu_memory += bo->base.base.size;
67 mutex_unlock(&vdev->bo_list_lock);
68
69 return sysfs_emit(buf, "%lld\n", total_npu_memory);
70}
71
72static DEVICE_ATTR_RO(npu_memory_utilization);
73
74/**
75 * DOC: sched_mode
76 *
77 * The sched_mode is used to report current NPU scheduling mode.
78 *
79 * It returns following strings:
80 * - "HW" - Hardware Scheduler mode
81 * - "OS" - Operating System Scheduler mode
82 *
83 */
84static ssize_t
85sched_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
86{
87 struct drm_device *drm = dev_get_drvdata(dev);
88 struct ivpu_device *vdev = to_ivpu_device(drm);
89
90 return sysfs_emit(buf, "%s\n", vdev->fw->sched_mode ? "HW" : "OS");
91}
92
93static DEVICE_ATTR_RO(sched_mode);
94
95/**
96 * DOC: npu_max_frequency
97 *
98 * The npu_max_frequency shows maximum frequency in MHz of the NPU's data
99 * processing unit
100 */
101static ssize_t
102npu_max_frequency_mhz_show(struct device *dev, struct device_attribute *attr, char *buf)
103{
104 struct drm_device *drm = dev_get_drvdata(dev);
105 struct ivpu_device *vdev = to_ivpu_device(drm);
106 u32 freq = ivpu_hw_dpu_max_freq_get(vdev);
107
108 return sysfs_emit(buf, "%lu\n", freq / HZ_PER_MHZ);
109}
110
111static DEVICE_ATTR_RO(npu_max_frequency_mhz);
112
113/**
114 * DOC: npu_current_frequency_mhz
115 *
116 * The npu_current_frequency_mhz shows current frequency in MHz of the NPU's
117 * data processing unit
118 */
119static ssize_t
120npu_current_frequency_mhz_show(struct device *dev, struct device_attribute *attr, char *buf)
121{
122 struct drm_device *drm = dev_get_drvdata(dev);
123 struct ivpu_device *vdev = to_ivpu_device(drm);
124 u32 freq = 0;
125
126 /* Read frequency only if device is active, otherwise frequency is 0 */
127 if (pm_runtime_get_if_active(vdev->drm.dev) > 0) {
128 freq = ivpu_hw_dpu_freq_get(vdev);
129
130 pm_runtime_put_autosuspend(vdev->drm.dev);
131 }
132
133 return sysfs_emit(buf, "%lu\n", freq / HZ_PER_MHZ);
134}
135
136static DEVICE_ATTR_RO(npu_current_frequency_mhz);
137
138static struct attribute *ivpu_dev_attrs[] = {
139 &dev_attr_npu_busy_time_us.attr,
140 &dev_attr_npu_memory_utilization.attr,
141 &dev_attr_sched_mode.attr,
142 &dev_attr_npu_max_frequency_mhz.attr,
143 &dev_attr_npu_current_frequency_mhz.attr,
144 NULL,
145};
146
147static struct attribute_group ivpu_dev_attr_group = {
148 .attrs = ivpu_dev_attrs,
149};
150
151void ivpu_sysfs_init(struct ivpu_device *vdev)
152{
153 int ret;
154
155 ret = devm_device_add_group(vdev->drm.dev, &ivpu_dev_attr_group);
156 if (ret)
157 ivpu_warn(vdev, "Failed to add group to device, ret %d", ret);
158}