drivers/gpu/drm/hyperv/hyperv_drm_modeset.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2021 Microsoft
   4  */
   5
   6 #include <linux/hyperv.h>
   7
   8 #include <drm/drm_damage_helper.h>
   9 #include <drm/drm_drv.h>
  10 #include <drm/drm_fb_helper.h>
  11 #include <drm/drm_format_helper.h>
  12 #include <drm/drm_fourcc.h>
  13 #include <drm/drm_gem_atomic_helper.h>
  14 #include <drm/drm_gem_framebuffer_helper.h>
  15 #include <drm/drm_gem_shmem_helper.h>
  16 #include <drm/drm_probe_helper.h>
  17 #include <drm/drm_simple_kms_helper.h>
  18
  19 #include "hyperv_drm.h"
  20
  21 static int hyperv_blit_to_vram_rect(struct drm_framebuffer *fb,
  22                                     const struct dma_buf_map *map,
  23                                     struct drm_rect *rect)
  24 {
  25         struct hyperv_drm_device *hv = to_hv(fb->dev);
  26         void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
  27         int idx;
  28
  29         if (!drm_dev_enter(&hv->dev, &idx))
  30                 return -ENODEV;
  31
  32         drm_fb_memcpy_dstclip(hv->vram, fb->pitches[0], vmap, fb, rect);
  33         drm_dev_exit(idx);
  34
  35         return 0;
  36 }
  37
  38 static int hyperv_blit_to_vram_fullscreen(struct drm_framebuffer *fb, const struct dma_buf_map *map)
  39 {
  40         struct drm_rect fullscreen = {
  41                 .x1 = 0,
  42                 .x2 = fb->width,
  43                 .y1 = 0,
  44                 .y2 = fb->height,
  45         };
  46         return hyperv_blit_to_vram_rect(fb, map, &fullscreen);
  47 }
  48
  49 static int hyperv_connector_get_modes(struct drm_connector *connector)
  50 {
  51         struct hyperv_drm_device *hv = to_hv(connector->dev);
  52         int count;
  53
  54         count = drm_add_modes_noedid(connector,
  55                                      connector->dev->mode_config.max_width,
  56                                      connector->dev->mode_config.max_height);
  57         drm_set_preferred_mode(connector, hv->preferred_width,
  58                                hv->preferred_height);
  59
  60         return count;
  61 }
  62
  63 static const struct drm_connector_helper_funcs hyperv_connector_helper_funcs = {
  64         .get_modes = hyperv_connector_get_modes,
  65 };
  66
  67 static const struct drm_connector_funcs hyperv_connector_funcs = {
  68         .fill_modes = drm_helper_probe_single_connector_modes,
  69         .destroy = drm_connector_cleanup,
  70         .reset = drm_atomic_helper_connector_reset,
  71         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  72         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  73 };
  74
  75 static inline int hyperv_conn_init(struct hyperv_drm_device *hv)
  76 {
  77         drm_connector_helper_add(&hv->connector, &hyperv_connector_helper_funcs);
  78         return drm_connector_init(&hv->dev, &hv->connector,
  79                                   &hyperv_connector_funcs,
  80                                   DRM_MODE_CONNECTOR_VIRTUAL);
  81 }
  82
  83 static int hyperv_check_size(struct hyperv_drm_device *hv, int w, int h,
  84                              struct drm_framebuffer *fb)
  85 {
  86         u32 pitch = w * (hv->screen_depth / 8);
  87
  88         if (fb)
  89                 pitch = fb->pitches[0];
  90
  91         if (pitch * h > hv->fb_size)
  92                 return -EINVAL;
  93
  94         return 0;
  95 }
  96
  97 static void hyperv_pipe_enable(struct drm_simple_display_pipe *pipe,
  98                                struct drm_crtc_state *crtc_state,
  99                                struct drm_plane_state *plane_state)
 100 {
 101         struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
 102         struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
 103
 104         hyperv_update_situation(hv->hdev, 1,  hv->screen_depth,
 105                                 crtc_state->mode.hdisplay,
 106                                 crtc_state->mode.vdisplay,
 107                                 plane_state->fb->pitches[0]);
 108         hyperv_blit_to_vram_fullscreen(plane_state->fb, &shadow_plane_state->data[0]);
 109 }
 110
 111 static int hyperv_pipe_check(struct drm_simple_display_pipe *pipe,
 112                              struct drm_plane_state *plane_state,
 113                              struct drm_crtc_state *crtc_state)
 114 {
 115         struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
 116         struct drm_framebuffer *fb = plane_state->fb;
 117
 118         if (fb->format->format != DRM_FORMAT_XRGB8888)
 119                 return -EINVAL;
 120
 121         if (fb->pitches[0] * fb->height > hv->fb_size)
 122                 return -EINVAL;
 123
 124         return 0;
 125 }
 126
 127 static void hyperv_pipe_update(struct drm_simple_display_pipe *pipe,
 128                                struct drm_plane_state *old_state)
 129 {
 130         struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
 131         struct drm_plane_state *state = pipe->plane.state;
 132         struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
 133         struct drm_rect rect;
 134
 135         if (drm_atomic_helper_damage_merged(old_state, state, &rect)) {
 136                 hyperv_blit_to_vram_rect(state->fb, &shadow_plane_state->data[0], &rect);
 137                 hyperv_update_dirt(hv->hdev, &rect);
 138         }
 139 }
 140
 141 static const struct drm_simple_display_pipe_funcs hyperv_pipe_funcs = {
 142         .enable = hyperv_pipe_enable,
 143         .check = hyperv_pipe_check,
 144         .update = hyperv_pipe_update,
 145         DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
 146 };
 147
 148 static const uint32_t hyperv_formats[] = {
 149         DRM_FORMAT_XRGB8888,
 150 };
 151
 152 static const uint64_t hyperv_modifiers[] = {
 153         DRM_FORMAT_MOD_LINEAR,
 154         DRM_FORMAT_MOD_INVALID
 155 };
 156
 157 static inline int hyperv_pipe_init(struct hyperv_drm_device *hv)
 158 {
 159         int ret;
 160
 161         ret = drm_simple_display_pipe_init(&hv->dev,
 162                                            &hv->pipe,
 163                                            &hyperv_pipe_funcs,
 164                                            hyperv_formats,
 165                                            ARRAY_SIZE(hyperv_formats),
 166                                            hyperv_modifiers,
 167                                            &hv->connector);
 168         if (ret)
 169                 return ret;
 170
 171         drm_plane_enable_fb_damage_clips(&hv->pipe.plane);
 172
 173         return 0;
 174 }
 175
 176 static enum drm_mode_status
 177 hyperv_mode_valid(struct drm_device *dev,
 178                   const struct drm_display_mode *mode)
 179 {
 180         struct hyperv_drm_device *hv = to_hv(dev);
 181
 182         if (hyperv_check_size(hv, mode->hdisplay, mode->vdisplay, NULL))
 183                 return MODE_BAD;
 184
 185         return MODE_OK;
 186 }
 187
 188 static const struct drm_mode_config_funcs hyperv_mode_config_funcs = {
 189         .fb_create = drm_gem_fb_create_with_dirty,
 190         .mode_valid = hyperv_mode_valid,
 191         .atomic_check = drm_atomic_helper_check,
 192         .atomic_commit = drm_atomic_helper_commit,
 193 };
 194
 195 int hyperv_mode_config_init(struct hyperv_drm_device *hv)
 196 {
 197         struct drm_device *dev = &hv->dev;
 198         int ret;
 199
 200         ret = drmm_mode_config_init(dev);
 201         if (ret) {
 202                 drm_err(dev, "Failed to initialized mode setting.\n");
 203                 return ret;
 204         }
 205
 206         dev->mode_config.min_width = 0;
 207         dev->mode_config.min_height = 0;
 208         dev->mode_config.max_width = hv->screen_width_max;
 209         dev->mode_config.max_height = hv->screen_height_max;
 210
 211         dev->mode_config.preferred_depth = hv->screen_depth;
 212         dev->mode_config.prefer_shadow = 0;
 213
 214         dev->mode_config.funcs = &hyperv_mode_config_funcs;
 215
 216         ret = hyperv_conn_init(hv);
 217         if (ret) {
 218                 drm_err(dev, "Failed to initialized connector.\n");
 219                 return ret;
 220         }
 221
 222         ret = hyperv_pipe_init(hv);
 223         if (ret) {
 224                 drm_err(dev, "Failed to initialized pipe.\n");
 225                 return ret;
 226         }
 227
 228         drm_mode_config_reset(dev);
 229
 230         return 0;
 231 }