1 // SPDX-License-Identifier: GPL-2.0 OR MIT 2 3 /* 4 * Xen para-virtual DRM device 5 * 6 * Copyright (C) 2016-2018 EPAM Systems Inc. 7 * 8 * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> 9 */ 10 11 #include <drm/drm_atomic.h> 12 #include <drm/drm_atomic_helper.h> 13 #include <drm/drm_drv.h> 14 #include <drm/drm_fourcc.h> 15 #include <drm/drm_gem.h> 16 #include <drm/drm_gem_framebuffer_helper.h> 17 #include <drm/drm_probe_helper.h> 18 #include <drm/drm_vblank.h> 19 20 #include "xen_drm_front.h" 21 #include "xen_drm_front_conn.h" 22 #include "xen_drm_front_kms.h" 23 24 /* 25 * Timeout in ms to wait for frame done event from the backend: 26 * must be a bit more than IO time-out 27 */ 28 #define FRAME_DONE_TO_MS (XEN_DRM_FRONT_WAIT_BACK_MS + 100) 29 30 static struct xen_drm_front_drm_pipeline * 31 to_xen_drm_pipeline(struct drm_simple_display_pipe *pipe) 32 { 33 return container_of(pipe, struct xen_drm_front_drm_pipeline, pipe); 34 } 35 36 static void fb_destroy(struct drm_framebuffer *fb) 37 { 38 struct xen_drm_front_drm_info *drm_info = fb->dev->dev_private; 39 int idx; 40 41 if (drm_dev_enter(fb->dev, &idx)) { 42 xen_drm_front_fb_detach(drm_info->front_info, 43 xen_drm_front_fb_to_cookie(fb)); 44 drm_dev_exit(idx); 45 } 46 drm_gem_fb_destroy(fb); 47 } 48 49 static const struct drm_framebuffer_funcs fb_funcs = { 50 .destroy = fb_destroy, 51 }; 52 53 static struct drm_framebuffer * 54 fb_create(struct drm_device *dev, struct drm_file *filp, 55 const struct drm_mode_fb_cmd2 *mode_cmd) 56 { 57 struct xen_drm_front_drm_info *drm_info = dev->dev_private; 58 struct drm_framebuffer *fb; 59 struct drm_gem_object *gem_obj; 60 int ret; 61 62 fb = drm_gem_fb_create_with_funcs(dev, filp, mode_cmd, &fb_funcs); 63 if (IS_ERR_OR_NULL(fb)) 64 return fb; 65 66 gem_obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]); 67 if (!gem_obj) { 68 DRM_ERROR("Failed to lookup GEM object\n"); 69 ret = -ENOENT; 70 goto fail; 71 } 72 73 drm_gem_object_put_unlocked(gem_obj); 74 75 ret = xen_drm_front_fb_attach(drm_info->front_info, 76 xen_drm_front_dbuf_to_cookie(gem_obj), 77 xen_drm_front_fb_to_cookie(fb), 78 fb->width, fb->height, 79 fb->format->format); 80 if (ret < 0) { 81 DRM_ERROR("Back failed to attach FB %p: %d\n", fb, ret); 82 goto fail; 83 } 84 85 return fb; 86 87 fail: 88 drm_gem_fb_destroy(fb); 89 return ERR_PTR(ret); 90 } 91 92 static const struct drm_mode_config_funcs mode_config_funcs = { 93 .fb_create = fb_create, 94 .atomic_check = drm_atomic_helper_check, 95 .atomic_commit = drm_atomic_helper_commit, 96 }; 97 98 static void send_pending_event(struct xen_drm_front_drm_pipeline *pipeline) 99 { 100 struct drm_crtc *crtc = &pipeline->pipe.crtc; 101 struct drm_device *dev = crtc->dev; 102 unsigned long flags; 103 104 spin_lock_irqsave(&dev->event_lock, flags); 105 if (pipeline->pending_event) 106 drm_crtc_send_vblank_event(crtc, pipeline->pending_event); 107 pipeline->pending_event = NULL; 108 spin_unlock_irqrestore(&dev->event_lock, flags); 109 } 110 111 static void display_enable(struct drm_simple_display_pipe *pipe, 112 struct drm_crtc_state *crtc_state, 113 struct drm_plane_state *plane_state) 114 { 115 struct xen_drm_front_drm_pipeline *pipeline = 116 to_xen_drm_pipeline(pipe); 117 struct drm_crtc *crtc = &pipe->crtc; 118 struct drm_framebuffer *fb = plane_state->fb; 119 int ret, idx; 120 121 if (!drm_dev_enter(pipe->crtc.dev, &idx)) 122 return; 123 124 ret = xen_drm_front_mode_set(pipeline, crtc->x, crtc->y, 125 fb->width, fb->height, 126 fb->format->cpp[0] * 8, 127 xen_drm_front_fb_to_cookie(fb)); 128 129 if (ret) { 130 DRM_ERROR("Failed to enable display: %d\n", ret); 131 pipeline->conn_connected = false; 132 } 133 134 drm_dev_exit(idx); 135 } 136 137 static void display_disable(struct drm_simple_display_pipe *pipe) 138 { 139 struct xen_drm_front_drm_pipeline *pipeline = 140 to_xen_drm_pipeline(pipe); 141 int ret = 0, idx; 142 143 if (drm_dev_enter(pipe->crtc.dev, &idx)) { 144 ret = xen_drm_front_mode_set(pipeline, 0, 0, 0, 0, 0, 145 xen_drm_front_fb_to_cookie(NULL)); 146 drm_dev_exit(idx); 147 } 148 if (ret) 149 DRM_ERROR("Failed to disable display: %d\n", ret); 150 151 /* Make sure we can restart with enabled connector next time */ 152 pipeline->conn_connected = true; 153 154 /* release stalled event if any */ 155 send_pending_event(pipeline); 156 } 157 158 void xen_drm_front_kms_on_frame_done(struct xen_drm_front_drm_pipeline *pipeline, 159 u64 fb_cookie) 160 { 161 /* 162 * This runs in interrupt context, e.g. under 163 * drm_info->front_info->io_lock, so we cannot call _sync version 164 * to cancel the work 165 */ 166 cancel_delayed_work(&pipeline->pflip_to_worker); 167 168 send_pending_event(pipeline); 169 } 170 171 static void pflip_to_worker(struct work_struct *work) 172 { 173 struct delayed_work *delayed_work = to_delayed_work(work); 174 struct xen_drm_front_drm_pipeline *pipeline = 175 container_of(delayed_work, 176 struct xen_drm_front_drm_pipeline, 177 pflip_to_worker); 178 179 DRM_ERROR("Frame done timed-out, releasing"); 180 send_pending_event(pipeline); 181 } 182 183 static bool display_send_page_flip(struct drm_simple_display_pipe *pipe, 184 struct drm_plane_state *old_plane_state) 185 { 186 struct drm_plane_state *plane_state = 187 drm_atomic_get_new_plane_state(old_plane_state->state, 188 &pipe->plane); 189 190 /* 191 * If old_plane_state->fb is NULL and plane_state->fb is not, 192 * then this is an atomic commit which will enable display. 193 * If old_plane_state->fb is not NULL and plane_state->fb is, 194 * then this is an atomic commit which will disable display. 195 * Ignore these and do not send page flip as this framebuffer will be 196 * sent to the backend as a part of display_set_config call. 197 */ 198 if (old_plane_state->fb && plane_state->fb) { 199 struct xen_drm_front_drm_pipeline *pipeline = 200 to_xen_drm_pipeline(pipe); 201 struct xen_drm_front_drm_info *drm_info = pipeline->drm_info; 202 int ret; 203 204 schedule_delayed_work(&pipeline->pflip_to_worker, 205 msecs_to_jiffies(FRAME_DONE_TO_MS)); 206 207 ret = xen_drm_front_page_flip(drm_info->front_info, 208 pipeline->index, 209 xen_drm_front_fb_to_cookie(plane_state->fb)); 210 if (ret) { 211 DRM_ERROR("Failed to send page flip request to backend: %d\n", ret); 212 213 pipeline->conn_connected = false; 214 /* 215 * Report the flip not handled, so pending event is 216 * sent, unblocking user-space. 217 */ 218 return false; 219 } 220 /* 221 * Signal that page flip was handled, pending event will be sent 222 * on frame done event from the backend. 223 */ 224 return true; 225 } 226 227 return false; 228 } 229 230 static void display_update(struct drm_simple_display_pipe *pipe, 231 struct drm_plane_state *old_plane_state) 232 { 233 struct xen_drm_front_drm_pipeline *pipeline = 234 to_xen_drm_pipeline(pipe); 235 struct drm_crtc *crtc = &pipe->crtc; 236 struct drm_pending_vblank_event *event; 237 int idx; 238 239 event = crtc->state->event; 240 if (event) { 241 struct drm_device *dev = crtc->dev; 242 unsigned long flags; 243 244 WARN_ON(pipeline->pending_event); 245 246 spin_lock_irqsave(&dev->event_lock, flags); 247 crtc->state->event = NULL; 248 249 pipeline->pending_event = event; 250 spin_unlock_irqrestore(&dev->event_lock, flags); 251 } 252 253 if (!drm_dev_enter(pipe->crtc.dev, &idx)) { 254 send_pending_event(pipeline); 255 return; 256 } 257 258 /* 259 * Send page flip request to the backend *after* we have event cached 260 * above, so on page flip done event from the backend we can 261 * deliver it and there is no race condition between this code and 262 * event from the backend. 263 * If this is not a page flip, e.g. no flip done event from the backend 264 * is expected, then send now. 265 */ 266 if (!display_send_page_flip(pipe, old_plane_state)) 267 send_pending_event(pipeline); 268 269 drm_dev_exit(idx); 270 } 271 272 static enum drm_mode_status 273 display_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode *mode) 274 { 275 struct xen_drm_front_drm_pipeline *pipeline = 276 container_of(crtc, struct xen_drm_front_drm_pipeline, 277 pipe.crtc); 278 279 if (mode->hdisplay != pipeline->width) 280 return MODE_ERROR; 281 282 if (mode->vdisplay != pipeline->height) 283 return MODE_ERROR; 284 285 return MODE_OK; 286 } 287 288 static const struct drm_simple_display_pipe_funcs display_funcs = { 289 .mode_valid = display_mode_valid, 290 .enable = display_enable, 291 .disable = display_disable, 292 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb, 293 .update = display_update, 294 }; 295 296 static int display_pipe_init(struct xen_drm_front_drm_info *drm_info, 297 int index, struct xen_drm_front_cfg_connector *cfg, 298 struct xen_drm_front_drm_pipeline *pipeline) 299 { 300 struct drm_device *dev = drm_info->drm_dev; 301 const u32 *formats; 302 int format_count; 303 int ret; 304 305 pipeline->drm_info = drm_info; 306 pipeline->index = index; 307 pipeline->height = cfg->height; 308 pipeline->width = cfg->width; 309 310 INIT_DELAYED_WORK(&pipeline->pflip_to_worker, pflip_to_worker); 311 312 ret = xen_drm_front_conn_init(drm_info, &pipeline->conn); 313 if (ret) 314 return ret; 315 316 formats = xen_drm_front_conn_get_formats(&format_count); 317 318 return drm_simple_display_pipe_init(dev, &pipeline->pipe, 319 &display_funcs, formats, 320 format_count, NULL, 321 &pipeline->conn); 322 } 323 324 int xen_drm_front_kms_init(struct xen_drm_front_drm_info *drm_info) 325 { 326 struct drm_device *dev = drm_info->drm_dev; 327 int i, ret; 328 329 drm_mode_config_init(dev); 330 331 dev->mode_config.min_width = 0; 332 dev->mode_config.min_height = 0; 333 dev->mode_config.max_width = 4095; 334 dev->mode_config.max_height = 2047; 335 dev->mode_config.funcs = &mode_config_funcs; 336 337 for (i = 0; i < drm_info->front_info->cfg.num_connectors; i++) { 338 struct xen_drm_front_cfg_connector *cfg = 339 &drm_info->front_info->cfg.connectors[i]; 340 struct xen_drm_front_drm_pipeline *pipeline = 341 &drm_info->pipeline[i]; 342 343 ret = display_pipe_init(drm_info, i, cfg, pipeline); 344 if (ret) { 345 drm_mode_config_cleanup(dev); 346 return ret; 347 } 348 } 349 350 drm_mode_config_reset(dev); 351 drm_kms_helper_poll_init(dev); 352 return 0; 353 } 354 355 void xen_drm_front_kms_fini(struct xen_drm_front_drm_info *drm_info) 356 { 357 int i; 358 359 for (i = 0; i < drm_info->front_info->cfg.num_connectors; i++) { 360 struct xen_drm_front_drm_pipeline *pipeline = 361 &drm_info->pipeline[i]; 362 363 cancel_delayed_work_sync(&pipeline->pflip_to_worker); 364 365 send_pending_event(pipeline); 366 } 367 } 368