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