drivers/gpu/drm/msm/disp/msm_disp_snapshot.c

   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
  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 *
  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
  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
  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
  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
 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 }