1 // SPDX-License-Identifier: GPL-2.0-only
2
3 /* Copyright (c) 2020-2025, The Linux Foundation. All rights reserved. */
4
5 #include <drm/drm_file.h>
6 #include <drm/drm_managed.h>
7 #include <linux/device.h>
8 #include <linux/kernel.h>
9 #include <linux/kobject.h>
10 #include <linux/mutex.h>
11 #include <linux/sysfs.h>
12
13 #include "qaic.h"
14
15 #define NAME_LEN 14
16
17 struct dbc_attribute {
18 struct device_attribute dev_attr;
19 u32 dbc_id;
20 char name[NAME_LEN];
21 };
22
dbc_state_show(struct device * dev,struct device_attribute * a,char * buf)23 static ssize_t dbc_state_show(struct device *dev, struct device_attribute *a, char *buf)
24 {
25 struct dbc_attribute *dbc_attr = container_of(a, struct dbc_attribute, dev_attr);
26 struct drm_minor *minor = dev_get_drvdata(dev);
27 struct qaic_device *qdev;
28
29 qdev = to_qaic_device(minor->dev);
30 return sysfs_emit(buf, "%d\n", qdev->dbc[dbc_attr->dbc_id].state);
31 }
32
set_dbc_state(struct qaic_device * qdev,u32 dbc_id,unsigned int state)33 void set_dbc_state(struct qaic_device *qdev, u32 dbc_id, unsigned int state)
34 {
35 struct device *kdev = to_accel_kdev(qdev->qddev);
36 char *envp[3] = {};
37 char state_str[16];
38 char id_str[12];
39
40 envp[0] = id_str;
41 envp[1] = state_str;
42
43 if (state >= DBC_STATE_MAX)
44 return;
45 if (dbc_id >= qdev->num_dbc)
46 return;
47 if (state == qdev->dbc[dbc_id].state)
48 return;
49
50 scnprintf(id_str, ARRAY_SIZE(id_str), "DBC_ID=%d", dbc_id);
51 scnprintf(state_str, ARRAY_SIZE(state_str), "DBC_STATE=%d", state);
52
53 qdev->dbc[dbc_id].state = state;
54 kobject_uevent_env(&kdev->kobj, KOBJ_CHANGE, envp);
55 }
56
qaic_sysfs_init(struct qaic_drm_device * qddev)57 int qaic_sysfs_init(struct qaic_drm_device *qddev)
58 {
59 struct device *kdev = to_accel_kdev(qddev);
60 struct drm_device *drm = to_drm(qddev);
61 u32 num_dbc = qddev->qdev->num_dbc;
62 struct dbc_attribute *dbc_attrs;
63 int i, ret;
64
65 dbc_attrs = drmm_kcalloc(drm, num_dbc, sizeof(*dbc_attrs), GFP_KERNEL);
66 if (!dbc_attrs)
67 return -ENOMEM;
68
69 for (i = 0; i < num_dbc; ++i) {
70 struct dbc_attribute *dbc_attr = &dbc_attrs[i];
71
72 sysfs_attr_init(&dbc_attr->dev_attr.attr);
73 dbc_attr->dbc_id = i;
74 scnprintf(dbc_attr->name, NAME_LEN, "dbc%d_state", i);
75 dbc_attr->dev_attr.attr.name = dbc_attr->name;
76 dbc_attr->dev_attr.attr.mode = 0444;
77 dbc_attr->dev_attr.show = dbc_state_show;
78 ret = sysfs_create_file(&kdev->kobj, &dbc_attr->dev_attr.attr);
79 if (ret) {
80 int j;
81
82 for (j = 0; j < i; ++j) {
83 dbc_attr = &dbc_attrs[j];
84 sysfs_remove_file(&kdev->kobj, &dbc_attr->dev_attr.attr);
85 }
86 drmm_kfree(drm, dbc_attrs);
87 return ret;
88 }
89 }
90
91 qddev->sysfs_attrs = dbc_attrs;
92 return 0;
93 }
94
qaic_sysfs_remove(struct qaic_drm_device * qddev)95 void qaic_sysfs_remove(struct qaic_drm_device *qddev)
96 {
97 struct dbc_attribute *dbc_attrs = qddev->sysfs_attrs;
98 struct device *kdev = to_accel_kdev(qddev);
99 u32 num_dbc = qddev->qdev->num_dbc;
100 int i;
101
102 if (!dbc_attrs)
103 return;
104
105 qddev->sysfs_attrs = NULL;
106 for (i = 0; i < num_dbc; ++i)
107 sysfs_remove_file(&kdev->kobj, &dbc_attrs[i].dev_attr.attr);
108 drmm_kfree(to_drm(qddev), dbc_attrs);
109 }
110