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
10static 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
31struct msm_disp_state *
32msm_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
53static 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
81void 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
97int 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
121void 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