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->map[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->map[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 } 232