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