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: MIT
2/*
3 * Copyright © 2023 Intel Corporation
4 */
5
6#include <linux/kobject.h>
7#include <linux/pci.h>
8#include <linux/sysfs.h>
9
10#include <drm/drm_managed.h>
11
12#include "xe_device.h"
13#include "xe_device_sysfs.h"
14#include "xe_pm.h"
15
16/**
17 * DOC: Xe device sysfs
18 * Xe driver requires exposing certain tunable knobs controlled by user space for
19 * each graphics device. Considering this, we need to add sysfs attributes at device
20 * level granularity.
21 * These sysfs attributes will be available under pci device kobj directory.
22 *
23 * vram_d3cold_threshold - Report/change vram used threshold(in MB) below
24 * which vram save/restore is permissible during runtime D3cold entry/exit.
25 */
26
27static ssize_t
28vram_d3cold_threshold_show(struct device *dev,
29 struct device_attribute *attr, char *buf)
30{
31 struct pci_dev *pdev = to_pci_dev(dev);
32 struct xe_device *xe = pdev_to_xe_device(pdev);
33 int ret;
34
35 if (!xe)
36 return -EINVAL;
37
38 xe_pm_runtime_get(xe);
39 ret = sysfs_emit(buf, "%d\n", xe->d3cold.vram_threshold);
40 xe_pm_runtime_put(xe);
41
42 return ret;
43}
44
45static ssize_t
46vram_d3cold_threshold_store(struct device *dev, struct device_attribute *attr,
47 const char *buff, size_t count)
48{
49 struct pci_dev *pdev = to_pci_dev(dev);
50 struct xe_device *xe = pdev_to_xe_device(pdev);
51 u32 vram_d3cold_threshold;
52 int ret;
53
54 if (!xe)
55 return -EINVAL;
56
57 ret = kstrtou32(buff, 0, &vram_d3cold_threshold);
58 if (ret)
59 return ret;
60
61 drm_dbg(&xe->drm, "vram_d3cold_threshold: %u\n", vram_d3cold_threshold);
62
63 xe_pm_runtime_get(xe);
64 ret = xe_pm_set_vram_threshold(xe, vram_d3cold_threshold);
65 xe_pm_runtime_put(xe);
66
67 return ret ?: count;
68}
69
70static DEVICE_ATTR_RW(vram_d3cold_threshold);
71
72static void xe_device_sysfs_fini(void *arg)
73{
74 struct xe_device *xe = arg;
75
76 sysfs_remove_file(&xe->drm.dev->kobj, &dev_attr_vram_d3cold_threshold.attr);
77}
78
79int xe_device_sysfs_init(struct xe_device *xe)
80{
81 struct device *dev = xe->drm.dev;
82 int ret;
83
84 ret = sysfs_create_file(&dev->kobj, &dev_attr_vram_d3cold_threshold.attr);
85 if (ret)
86 return ret;
87
88 return devm_add_action_or_reset(dev, xe_device_sysfs_fini, xe);
89}