1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
4 */
5
6 #define pr_fmt(fmt) "[drm:%s:%d] " fmt, __func__, __LINE__
7
8 #include "msm_disp_snapshot.h"
9
disp_devcoredump_read(char * buffer,loff_t offset,size_t count,void * data,size_t datalen)10 static ssize_t __maybe_unused disp_devcoredump_read(char *buffer, loff_t offset,
11 size_t count, void *data, size_t datalen)
12 {
13 struct drm_print_iterator iter;
14 struct drm_printer p;
15 struct msm_disp_state *disp_state;
16
17 disp_state = data;
18
19 iter.data = buffer;
20 iter.offset = 0;
21 iter.start = offset;
22 iter.remain = count;
23
24 p = drm_coredump_printer(&iter);
25
26 msm_disp_state_print(disp_state, &p);
27
28 return count - iter.remain;
29 }
30
31 struct msm_disp_state *
msm_disp_snapshot_state_sync(struct msm_kms * kms)32 msm_disp_snapshot_state_sync(struct msm_kms *kms)
33 {
34 struct drm_device *drm_dev = kms->dev;
35 struct msm_disp_state *disp_state;
36
37 WARN_ON(!mutex_is_locked(&kms->dump_mutex));
38
39 disp_state = kzalloc(sizeof(struct msm_disp_state), GFP_KERNEL);
40 if (!disp_state)
41 return ERR_PTR(-ENOMEM);
42
43 disp_state->dev = drm_dev->dev;
44 disp_state->drm_dev = drm_dev;
45
46 INIT_LIST_HEAD(&disp_state->blocks);
47
48 msm_disp_snapshot_capture_state(disp_state);
49
50 return disp_state;
51 }
52
_msm_disp_snapshot_work(struct kthread_work * work)53 static void _msm_disp_snapshot_work(struct kthread_work *work)
54 {
55 struct msm_kms *kms = container_of(work, struct msm_kms, dump_work);
56 struct msm_disp_state *disp_state;
57 struct drm_printer p;
58
59 /* Serialize dumping here */
60 mutex_lock(&kms->dump_mutex);
61 disp_state = msm_disp_snapshot_state_sync(kms);
62 mutex_unlock(&kms->dump_mutex);
63
64 if (IS_ERR(disp_state))
65 return;
66
67 if (MSM_DISP_SNAPSHOT_DUMP_IN_CONSOLE) {
68 p = drm_info_printer(disp_state->drm_dev->dev);
69 msm_disp_state_print(disp_state, &p);
70 }
71
72 /*
73 * If COREDUMP is disabled, the stub will call the free function.
74 * If there is a codedump pending for the device, the dev_coredumpm()
75 * will also free new coredump state.
76 */
77 dev_coredumpm(disp_state->dev, THIS_MODULE, disp_state, 0, GFP_KERNEL,
78 disp_devcoredump_read, msm_disp_state_free);
79 }
80
msm_disp_snapshot_state(struct drm_device * drm_dev)81 void msm_disp_snapshot_state(struct drm_device *drm_dev)
82 {
83 struct msm_drm_private *priv;
84 struct msm_kms *kms;
85
86 if (!drm_dev) {
87 DRM_ERROR("invalid params\n");
88 return;
89 }
90
91 priv = drm_dev->dev_private;
92 kms = priv->kms;
93
94 kthread_queue_work(kms->dump_worker, &kms->dump_work);
95 }
96
msm_disp_snapshot_init(struct drm_device * drm_dev)97 int msm_disp_snapshot_init(struct drm_device *drm_dev)
98 {
99 struct msm_drm_private *priv;
100 struct msm_kms *kms;
101
102 if (!drm_dev) {
103 DRM_ERROR("invalid params\n");
104 return -EINVAL;
105 }
106
107 priv = drm_dev->dev_private;
108 kms = priv->kms;
109
110 mutex_init(&kms->dump_mutex);
111
112 kms->dump_worker = kthread_create_worker(0, "%s", "disp_snapshot");
113 if (IS_ERR(kms->dump_worker))
114 DRM_ERROR("failed to create disp state task\n");
115
116 kthread_init_work(&kms->dump_work, _msm_disp_snapshot_work);
117
118 return 0;
119 }
120
msm_disp_snapshot_destroy(struct drm_device * drm_dev)121 void msm_disp_snapshot_destroy(struct drm_device *drm_dev)
122 {
123 struct msm_kms *kms;
124 struct msm_drm_private *priv;
125
126 if (!drm_dev) {
127 DRM_ERROR("invalid params\n");
128 return;
129 }
130
131 priv = drm_dev->dev_private;
132 kms = priv->kms;
133
134 if (kms->dump_worker)
135 kthread_destroy_worker(kms->dump_worker);
136
137 mutex_destroy(&kms->dump_mutex);
138 }
139