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_edid.h>
  11 #include <drm/drm_fb_helper.h>
  12 #include <drm/drm_format_helper.h>
  13 #include <drm/drm_fourcc.h>
  14 #include <drm/drm_framebuffer.h>
  15 #include <drm/drm_gem_atomic_helper.h>
  16 #include <drm/drm_gem_framebuffer_helper.h>
  17 #include <drm/drm_gem_shmem_helper.h>
  18 #include <drm/drm_probe_helper.h>
  19 #include <drm/drm_simple_kms_helper.h>
  20
  21 #include "hyperv_drm.h"
  22
  23 static int hyperv_blit_to_vram_rect(struct drm_framebuffer *fb,
  24                                     const struct iosys_map *map,
  25                                     struct drm_rect *rect)
  26 {
  27         struct hyperv_drm_device *hv = to_hv(fb->dev);
  28         void __iomem *dst = hv->vram;
  29         void *vmap = map->vaddr; /* TODO: Use mapping abstraction properly */
  30         int idx;
  31
  32         if (!drm_dev_enter(&hv->dev, &idx))
  33                 return -ENODEV;
  34
  35         dst += drm_fb_clip_offset(fb->pitches[0], fb->format, rect);
  36         drm_fb_memcpy_toio(dst, fb->pitches[0], vmap, fb, rect);
  37
  38         drm_dev_exit(idx);
  39
  40         return 0;
  41 }
  42
  43 static int hyperv_blit_to_vram_fullscreen(struct drm_framebuffer *fb,
  44                                           const struct iosys_map *map)
  45 {
  46         struct drm_rect fullscreen = {
  47                 .x1 = 0,
  48                 .x2 = fb->width,
  49                 .y1 = 0,
  50                 .y2 = fb->height,
  51         };
  52         return hyperv_blit_to_vram_rect(fb, map, &fullscreen);
  53 }
  54
  55 static int hyperv_connector_get_modes(struct drm_connector *connector)
  56 {
  57         struct hyperv_drm_device *hv = to_hv(connector->dev);
  58         int count;
  59
  60         count = drm_add_modes_noedid(connector,
  61                                      connector->dev->mode_config.max_width,
  62                                      connector->dev->mode_config.max_height);
  63         drm_set_preferred_mode(connector, hv->preferred_width,
  64                                hv->preferred_height);
  65
  66         return count;
  67 }
  68
  69 static const struct drm_connector_helper_funcs hyperv_connector_helper_funcs = {
  70         .get_modes = hyperv_connector_get_modes,
  71 };
  72
  73 static const struct drm_connector_funcs hyperv_connector_funcs = {
  74         .fill_modes = drm_helper_probe_single_connector_modes,
  75         .destroy = drm_connector_cleanup,
  76         .reset = drm_atomic_helper_connector_reset,
  77         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  78         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  79 };
  80
  81 static inline int hyperv_conn_init(struct hyperv_drm_device *hv)
  82 {
  83         drm_connector_helper_add(&hv->connector, &hyperv_connector_helper_funcs);
  84         return drm_connector_init(&hv->dev, &hv->connector,
  85                                   &hyperv_connector_funcs,
  86                                   DRM_MODE_CONNECTOR_VIRTUAL);
  87 }
  88
  89 static int hyperv_check_size(struct hyperv_drm_device *hv, int w, int h,
  90                              struct drm_framebuffer *fb)
  91 {
  92         u32 pitch = w * (hv->screen_depth / 8);
  93
  94         if (fb)
  95                 pitch = fb->pitches[0];
  96
  97         if (pitch * h > hv->fb_size)
  98                 return -EINVAL;
  99
 100         return 0;
 101 }
 102
 103 static void hyperv_pipe_enable(struct drm_simple_display_pipe *pipe,
 104                                struct drm_crtc_state *crtc_state,
 105                                struct drm_plane_state *plane_state)
 106 {
 107         struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
 108         struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
 109
 110         hyperv_hide_hw_ptr(hv->hdev);
 111         hyperv_update_situation(hv->hdev, 1,  hv->screen_depth,
 112                                 crtc_state->mode.hdisplay,
 113                                 crtc_state->mode.vdisplay,
 114                                 plane_state->fb->pitches[0]);
 115         hyperv_blit_to_vram_fullscreen(plane_state->fb, &shadow_plane_state->data[0]);
 116 }
 117
 118 static int hyperv_pipe_check(struct drm_simple_display_pipe *pipe,
 119                              struct drm_plane_state *plane_state,
 120                              struct drm_crtc_state *crtc_state)
 121 {
 122         struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
 123         struct drm_framebuffer *fb = plane_state->fb;
 124
 125         if (fb->format->format != DRM_FORMAT_XRGB8888)
 126                 return -EINVAL;
 127
 128         if (fb->pitches[0] * fb->height > hv->fb_size) {
 129                 drm_err(&hv->dev, "fb size requested by %s for %dX%d (pitch %d) greater than %ld\n",
 130                         current->comm, fb->width, fb->height, fb->pitches[0], hv->fb_size);
 131                 return -EINVAL;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static void hyperv_pipe_update(struct drm_simple_display_pipe *pipe,
 138                                struct drm_plane_state *old_state)
 139 {
 140         struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev);
 141         struct drm_plane_state *state = pipe->plane.state;
 142         struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
 143         struct drm_rect rect;
 144
 145         if (drm_atomic_helper_damage_merged(old_state, state, &rect)) {
 146                 hyperv_blit_to_vram_rect(state->fb, &shadow_plane_state->data[0], &rect);
 147                 hyperv_update_dirt(hv->hdev, &rect);
 148         }
 149 }
 150
 151 static const struct drm_simple_display_pipe_funcs hyperv_pipe_funcs = {
 152         .enable = hyperv_pipe_enable,
 153         .check = hyperv_pipe_check,
 154         .update = hyperv_pipe_update,
 155         DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
 156 };
 157
 158 static const uint32_t hyperv_formats[] = {
 159         DRM_FORMAT_XRGB8888,
 160 };
 161
 162 static const uint64_t hyperv_modifiers[] = {
 163         DRM_FORMAT_MOD_LINEAR,
 164         DRM_FORMAT_MOD_INVALID
 165 };
 166
 167 static inline int hyperv_pipe_init(struct hyperv_drm_device *hv)
 168 {
 169         int ret;
 170
 171         ret = drm_simple_display_pipe_init(&hv->dev,
 172                                            &hv->pipe,
 173                                            &hyperv_pipe_funcs,
 174                                            hyperv_formats,
 175                                            ARRAY_SIZE(hyperv_formats),
 176                                            hyperv_modifiers,
 177                                            &hv->connector);
 178         if (ret)
 179                 return ret;
 180
 181         drm_plane_enable_fb_damage_clips(&hv->pipe.plane);
 182
 183         return 0;
 184 }
 185
 186 static enum drm_mode_status
 187 hyperv_mode_valid(struct drm_device *dev,
 188                   const struct drm_display_mode *mode)
 189 {
 190         struct hyperv_drm_device *hv = to_hv(dev);
 191
 192         if (hyperv_check_size(hv, mode->hdisplay, mode->vdisplay, NULL))
 193                 return MODE_BAD;
 194
 195         return MODE_OK;
 196 }
 197
 198 static const struct drm_mode_config_funcs hyperv_mode_config_funcs = {
 199         .fb_create = drm_gem_fb_create_with_dirty,
 200         .mode_valid = hyperv_mode_valid,
 201         .atomic_check = drm_atomic_helper_check,
 202         .atomic_commit = drm_atomic_helper_commit,
 203 };
 204
 205 int hyperv_mode_config_init(struct hyperv_drm_device *hv)
 206 {
 207         struct drm_device *dev = &hv->dev;
 208         int ret;
 209
 210         ret = drmm_mode_config_init(dev);
 211         if (ret) {
 212                 drm_err(dev, "Failed to initialized mode setting.\n");
 213                 return ret;
 214         }
 215
 216         dev->mode_config.min_width = 0;
 217         dev->mode_config.min_height = 0;
 218         dev->mode_config.max_width = hv->screen_width_max;
 219         dev->mode_config.max_height = hv->screen_height_max;
 220
 221         dev->mode_config.preferred_depth = hv->screen_depth;
 222         dev->mode_config.prefer_shadow = 0;
 223
 224         dev->mode_config.funcs = &hyperv_mode_config_funcs;
 225
 226         ret = hyperv_conn_init(hv);
 227         if (ret) {
 228                 drm_err(dev, "Failed to initialized connector.\n");
 229                 return ret;
 230         }
 231
 232         ret = hyperv_pipe_init(hv);
 233         if (ret) {
 234                 drm_err(dev, "Failed to initialized pipe.\n");
 235                 return ret;
 236         }
 237
 238         drm_mode_config_reset(dev);
 239
 240         return 0;
 241 }