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 return -EINVAL; 128 129 return 0; 130 } 131 132 static void hyperv_pipe_update(struct drm_simple_display_pipe *pipe, 133 struct drm_plane_state *old_state) 134 { 135 struct hyperv_drm_device *hv = to_hv(pipe->crtc.dev); 136 struct drm_plane_state *state = pipe->plane.state; 137 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state); 138 struct drm_rect rect; 139 140 if (drm_atomic_helper_damage_merged(old_state, state, &rect)) { 141 hyperv_blit_to_vram_rect(state->fb, &shadow_plane_state->data[0], &rect); 142 hyperv_update_dirt(hv->hdev, &rect); 143 } 144 } 145 146 static const struct drm_simple_display_pipe_funcs hyperv_pipe_funcs = { 147 .enable = hyperv_pipe_enable, 148 .check = hyperv_pipe_check, 149 .update = hyperv_pipe_update, 150 DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS, 151 }; 152 153 static const uint32_t hyperv_formats[] = { 154 DRM_FORMAT_XRGB8888, 155 }; 156 157 static const uint64_t hyperv_modifiers[] = { 158 DRM_FORMAT_MOD_LINEAR, 159 DRM_FORMAT_MOD_INVALID 160 }; 161 162 static inline int hyperv_pipe_init(struct hyperv_drm_device *hv) 163 { 164 int ret; 165 166 ret = drm_simple_display_pipe_init(&hv->dev, 167 &hv->pipe, 168 &hyperv_pipe_funcs, 169 hyperv_formats, 170 ARRAY_SIZE(hyperv_formats), 171 hyperv_modifiers, 172 &hv->connector); 173 if (ret) 174 return ret; 175 176 drm_plane_enable_fb_damage_clips(&hv->pipe.plane); 177 178 return 0; 179 } 180 181 static enum drm_mode_status 182 hyperv_mode_valid(struct drm_device *dev, 183 const struct drm_display_mode *mode) 184 { 185 struct hyperv_drm_device *hv = to_hv(dev); 186 187 if (hyperv_check_size(hv, mode->hdisplay, mode->vdisplay, NULL)) 188 return MODE_BAD; 189 190 return MODE_OK; 191 } 192 193 static const struct drm_mode_config_funcs hyperv_mode_config_funcs = { 194 .fb_create = drm_gem_fb_create_with_dirty, 195 .mode_valid = hyperv_mode_valid, 196 .atomic_check = drm_atomic_helper_check, 197 .atomic_commit = drm_atomic_helper_commit, 198 }; 199 200 int hyperv_mode_config_init(struct hyperv_drm_device *hv) 201 { 202 struct drm_device *dev = &hv->dev; 203 int ret; 204 205 ret = drmm_mode_config_init(dev); 206 if (ret) { 207 drm_err(dev, "Failed to initialized mode setting.\n"); 208 return ret; 209 } 210 211 dev->mode_config.min_width = 0; 212 dev->mode_config.min_height = 0; 213 dev->mode_config.max_width = hv->screen_width_max; 214 dev->mode_config.max_height = hv->screen_height_max; 215 216 dev->mode_config.preferred_depth = hv->screen_depth; 217 dev->mode_config.prefer_shadow = 0; 218 219 dev->mode_config.funcs = &hyperv_mode_config_funcs; 220 221 ret = hyperv_conn_init(hv); 222 if (ret) { 223 drm_err(dev, "Failed to initialized connector.\n"); 224 return ret; 225 } 226 227 ret = hyperv_pipe_init(hv); 228 if (ret) { 229 drm_err(dev, "Failed to initialized pipe.\n"); 230 return ret; 231 } 232 233 drm_mode_config_reset(dev); 234 235 return 0; 236 } 237