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}