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 } 242