1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright 2020 Noralf Trønnes 4 */ 5 6 #include <linux/lz4.h> 7 #include <linux/usb.h> 8 #include <linux/vmalloc.h> 9 #include <linux/workqueue.h> 10 11 #include <drm/drm_atomic.h> 12 #include <drm/drm_connector.h> 13 #include <drm/drm_damage_helper.h> 14 #include <drm/drm_drv.h> 15 #include <drm/drm_format_helper.h> 16 #include <drm/drm_fourcc.h> 17 #include <drm/drm_framebuffer.h> 18 #include <drm/drm_gem.h> 19 #include <drm/drm_gem_atomic_helper.h> 20 #include <drm/drm_gem_framebuffer_helper.h> 21 #include <drm/drm_print.h> 22 #include <drm/drm_rect.h> 23 #include <drm/drm_simple_kms_helper.h> 24 #include <drm/gud.h> 25 26 #include "gud_internal.h" 27 28 /* 29 * Some userspace rendering loops run all displays in the same loop. 30 * This means that a fast display will have to wait for a slow one. 31 * Such users might want to enable this module parameter. 32 */ 33 static bool gud_async_flush; 34 module_param_named(async_flush, gud_async_flush, bool, 0644); 35 MODULE_PARM_DESC(async_flush, "Enable asynchronous flushing [default=0]"); 36 37 /* 38 * FIXME: The driver is probably broken on Big Endian machines. 39 * See discussion: 40 * https://lore.kernel.org/dri-devel/CAKb7UvihLX0hgBOP3VBG7O+atwZcUVCPVuBdfmDMpg0NjXe-cQ@mail.gmail.com/ 41 */ 42 43 static bool gud_is_big_endian(void) 44 { 45 #if defined(__BIG_ENDIAN) 46 return true; 47 #else 48 return false; 49 #endif 50 } 51 52 static size_t gud_xrgb8888_to_r124(u8 *dst, const struct drm_format_info *format, 53 void *src, struct drm_framebuffer *fb, 54 struct drm_rect *rect) 55 { 56 unsigned int block_width = drm_format_info_block_width(format, 0); 57 unsigned int bits_per_pixel = 8 / block_width; 58 unsigned int x, y, width, height; 59 u8 pix, *pix8, *block = dst; /* Assign to silence compiler warning */ 60 struct iosys_map dst_map, vmap; 61 size_t len; 62 void *buf; 63 64 WARN_ON_ONCE(format->char_per_block[0] != 1); 65 66 /* Start on a byte boundary */ 67 rect->x1 = ALIGN_DOWN(rect->x1, block_width); 68 width = drm_rect_width(rect); 69 height = drm_rect_height(rect); 70 len = drm_format_info_min_pitch(format, 0, width) * height; 71 72 buf = kmalloc(width * height, GFP_KERNEL); 73 if (!buf) 74 return 0; 75 76 iosys_map_set_vaddr(&dst_map, buf); 77 iosys_map_set_vaddr(&vmap, src); 78 drm_fb_xrgb8888_to_gray8(&dst_map, NULL, &vmap, fb, rect); 79 pix8 = buf; 80 81 for (y = 0; y < height; y++) { 82 for (x = 0; x < width; x++) { 83 unsigned int pixpos = x % block_width; /* within byte from the left */ 84 unsigned int pixshift = (block_width - pixpos - 1) * bits_per_pixel; 85 86 if (!pixpos) { 87 block = dst++; 88 *block = 0; 89 } 90 91 pix = (*pix8++) >> (8 - bits_per_pixel); 92 *block |= pix << pixshift; 93 } 94 } 95 96 kfree(buf); 97 98 return len; 99 } 100 101 static size_t gud_xrgb8888_to_color(u8 *dst, const struct drm_format_info *format, 102 void *src, struct drm_framebuffer *fb, 103 struct drm_rect *rect) 104 { 105 unsigned int block_width = drm_format_info_block_width(format, 0); 106 unsigned int bits_per_pixel = 8 / block_width; 107 u8 r, g, b, pix, *block = dst; /* Assign to silence compiler warning */ 108 unsigned int x, y, width; 109 __le32 *sbuf32; 110 u32 pix32; 111 size_t len; 112 113 /* Start on a byte boundary */ 114 rect->x1 = ALIGN_DOWN(rect->x1, block_width); 115 width = drm_rect_width(rect); 116 len = drm_format_info_min_pitch(format, 0, width) * drm_rect_height(rect); 117 118 for (y = rect->y1; y < rect->y2; y++) { 119 sbuf32 = src + (y * fb->pitches[0]); 120 sbuf32 += rect->x1; 121 122 for (x = 0; x < width; x++) { 123 unsigned int pixpos = x % block_width; /* within byte from the left */ 124 unsigned int pixshift = (block_width - pixpos - 1) * bits_per_pixel; 125 126 if (!pixpos) { 127 block = dst++; 128 *block = 0; 129 } 130 131 pix32 = le32_to_cpu(*sbuf32++); 132 r = pix32 >> 16; 133 g = pix32 >> 8; 134 b = pix32; 135 136 switch (format->format) { 137 case GUD_DRM_FORMAT_XRGB1111: 138 pix = ((r >> 7) << 2) | ((g >> 7) << 1) | (b >> 7); 139 break; 140 default: 141 WARN_ON_ONCE(1); 142 return len; 143 } 144 145 *block |= pix << pixshift; 146 } 147 } 148 149 return len; 150 } 151 152 static int gud_prep_flush(struct gud_device *gdrm, struct drm_framebuffer *fb, 153 const struct iosys_map *src, bool cached_reads, 154 const struct drm_format_info *format, struct drm_rect *rect, 155 struct gud_set_buffer_req *req) 156 { 157 u8 compression = gdrm->compression; 158 struct iosys_map dst; 159 void *vaddr, *buf; 160 size_t pitch, len; 161 162 pitch = drm_format_info_min_pitch(format, 0, drm_rect_width(rect)); 163 len = pitch * drm_rect_height(rect); 164 if (len > gdrm->bulk_len) 165 return -E2BIG; 166 167 vaddr = src[0].vaddr; 168 retry: 169 if (compression) 170 buf = gdrm->compress_buf; 171 else 172 buf = gdrm->bulk_buf; 173 iosys_map_set_vaddr(&dst, buf); 174 175 /* 176 * Imported buffers are assumed to be write-combined and thus uncached 177 * with slow reads (at least on ARM). 178 */ 179 if (format != fb->format) { 180 if (format->format == GUD_DRM_FORMAT_R1) { 181 len = gud_xrgb8888_to_r124(buf, format, vaddr, fb, rect); 182 if (!len) 183 return -ENOMEM; 184 } else if (format->format == DRM_FORMAT_R8) { 185 drm_fb_xrgb8888_to_gray8(&dst, NULL, src, fb, rect); 186 } else if (format->format == DRM_FORMAT_RGB332) { 187 drm_fb_xrgb8888_to_rgb332(&dst, NULL, src, fb, rect); 188 } else if (format->format == DRM_FORMAT_RGB565) { 189 drm_fb_xrgb8888_to_rgb565(&dst, NULL, src, fb, rect, 190 gud_is_big_endian()); 191 } else if (format->format == DRM_FORMAT_RGB888) { 192 drm_fb_xrgb8888_to_rgb888(&dst, NULL, src, fb, rect); 193 } else { 194 len = gud_xrgb8888_to_color(buf, format, vaddr, fb, rect); 195 } 196 } else if (gud_is_big_endian() && format->cpp[0] > 1) { 197 drm_fb_swab(&dst, NULL, src, fb, rect, cached_reads); 198 } else if (compression && cached_reads && pitch == fb->pitches[0]) { 199 /* can compress directly from the framebuffer */ 200 buf = vaddr + rect->y1 * pitch; 201 } else { 202 drm_fb_memcpy(&dst, NULL, src, fb, rect); 203 } 204 205 memset(req, 0, sizeof(*req)); 206 req->x = cpu_to_le32(rect->x1); 207 req->y = cpu_to_le32(rect->y1); 208 req->width = cpu_to_le32(drm_rect_width(rect)); 209 req->height = cpu_to_le32(drm_rect_height(rect)); 210 req->length = cpu_to_le32(len); 211 212 if (compression & GUD_COMPRESSION_LZ4) { 213 int complen; 214 215 complen = LZ4_compress_default(buf, gdrm->bulk_buf, len, len, gdrm->lz4_comp_mem); 216 if (complen <= 0) { 217 compression = 0; 218 goto retry; 219 } 220 221 req->compression = GUD_COMPRESSION_LZ4; 222 req->compressed_length = cpu_to_le32(complen); 223 } 224 225 return 0; 226 } 227 228 struct gud_usb_bulk_context { 229 struct timer_list timer; 230 struct usb_sg_request sgr; 231 }; 232 233 static void gud_usb_bulk_timeout(struct timer_list *t) 234 { 235 struct gud_usb_bulk_context *ctx = from_timer(ctx, t, timer); 236 237 usb_sg_cancel(&ctx->sgr); 238 } 239 240 static int gud_usb_bulk(struct gud_device *gdrm, size_t len) 241 { 242 struct gud_usb_bulk_context ctx; 243 int ret; 244 245 ret = usb_sg_init(&ctx.sgr, gud_to_usb_device(gdrm), gdrm->bulk_pipe, 0, 246 gdrm->bulk_sgt.sgl, gdrm->bulk_sgt.nents, len, GFP_KERNEL); 247 if (ret) 248 return ret; 249 250 timer_setup_on_stack(&ctx.timer, gud_usb_bulk_timeout, 0); 251 mod_timer(&ctx.timer, jiffies + msecs_to_jiffies(3000)); 252 253 usb_sg_wait(&ctx.sgr); 254 255 if (!del_timer_sync(&ctx.timer)) 256 ret = -ETIMEDOUT; 257 else if (ctx.sgr.status < 0) 258 ret = ctx.sgr.status; 259 else if (ctx.sgr.bytes != len) 260 ret = -EIO; 261 262 destroy_timer_on_stack(&ctx.timer); 263 264 return ret; 265 } 266 267 static int gud_flush_rect(struct gud_device *gdrm, struct drm_framebuffer *fb, 268 const struct iosys_map *src, bool cached_reads, 269 const struct drm_format_info *format, struct drm_rect *rect) 270 { 271 struct gud_set_buffer_req req; 272 size_t len, trlen; 273 int ret; 274 275 drm_dbg(&gdrm->drm, "Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect)); 276 277 ret = gud_prep_flush(gdrm, fb, src, cached_reads, format, rect, &req); 278 if (ret) 279 return ret; 280 281 len = le32_to_cpu(req.length); 282 283 if (req.compression) 284 trlen = le32_to_cpu(req.compressed_length); 285 else 286 trlen = len; 287 288 gdrm->stats_length += len; 289 /* Did it wrap around? */ 290 if (gdrm->stats_length <= len && gdrm->stats_actual_length) { 291 gdrm->stats_length = len; 292 gdrm->stats_actual_length = 0; 293 } 294 gdrm->stats_actual_length += trlen; 295 296 if (!(gdrm->flags & GUD_DISPLAY_FLAG_FULL_UPDATE) || gdrm->prev_flush_failed) { 297 ret = gud_usb_set(gdrm, GUD_REQ_SET_BUFFER, 0, &req, sizeof(req)); 298 if (ret) 299 return ret; 300 } 301 302 ret = gud_usb_bulk(gdrm, trlen); 303 if (ret) 304 gdrm->stats_num_errors++; 305 306 return ret; 307 } 308 309 void gud_clear_damage(struct gud_device *gdrm) 310 { 311 gdrm->damage.x1 = INT_MAX; 312 gdrm->damage.y1 = INT_MAX; 313 gdrm->damage.x2 = 0; 314 gdrm->damage.y2 = 0; 315 } 316 317 static void gud_flush_damage(struct gud_device *gdrm, struct drm_framebuffer *fb, 318 const struct iosys_map *src, bool cached_reads, 319 struct drm_rect *damage) 320 { 321 const struct drm_format_info *format; 322 unsigned int i, lines; 323 size_t pitch; 324 int ret; 325 326 format = fb->format; 327 if (format->format == DRM_FORMAT_XRGB8888 && gdrm->xrgb8888_emulation_format) 328 format = gdrm->xrgb8888_emulation_format; 329 330 /* Split update if it's too big */ 331 pitch = drm_format_info_min_pitch(format, 0, drm_rect_width(damage)); 332 lines = drm_rect_height(damage); 333 334 if (gdrm->bulk_len < lines * pitch) 335 lines = gdrm->bulk_len / pitch; 336 337 for (i = 0; i < DIV_ROUND_UP(drm_rect_height(damage), lines); i++) { 338 struct drm_rect rect = *damage; 339 340 rect.y1 += i * lines; 341 rect.y2 = min_t(u32, rect.y1 + lines, damage->y2); 342 343 ret = gud_flush_rect(gdrm, fb, src, cached_reads, format, &rect); 344 if (ret) { 345 if (ret != -ENODEV && ret != -ECONNRESET && 346 ret != -ESHUTDOWN && ret != -EPROTO) 347 dev_err_ratelimited(fb->dev->dev, 348 "Failed to flush framebuffer: error=%d\n", ret); 349 gdrm->prev_flush_failed = true; 350 break; 351 } 352 } 353 } 354 355 void gud_flush_work(struct work_struct *work) 356 { 357 struct gud_device *gdrm = container_of(work, struct gud_device, work); 358 struct iosys_map shadow_map; 359 struct drm_framebuffer *fb; 360 struct drm_rect damage; 361 int idx; 362 363 if (!drm_dev_enter(&gdrm->drm, &idx)) 364 return; 365 366 mutex_lock(&gdrm->damage_lock); 367 fb = gdrm->fb; 368 gdrm->fb = NULL; 369 iosys_map_set_vaddr(&shadow_map, gdrm->shadow_buf); 370 damage = gdrm->damage; 371 gud_clear_damage(gdrm); 372 mutex_unlock(&gdrm->damage_lock); 373 374 if (!fb) 375 goto out; 376 377 gud_flush_damage(gdrm, fb, &shadow_map, true, &damage); 378 379 drm_framebuffer_put(fb); 380 out: 381 drm_dev_exit(idx); 382 } 383 384 static int gud_fb_queue_damage(struct gud_device *gdrm, struct drm_framebuffer *fb, 385 const struct iosys_map *src, struct drm_rect *damage) 386 { 387 struct drm_framebuffer *old_fb = NULL; 388 struct iosys_map shadow_map; 389 390 mutex_lock(&gdrm->damage_lock); 391 392 if (!gdrm->shadow_buf) { 393 gdrm->shadow_buf = vcalloc(fb->pitches[0], fb->height); 394 if (!gdrm->shadow_buf) { 395 mutex_unlock(&gdrm->damage_lock); 396 return -ENOMEM; 397 } 398 } 399 400 iosys_map_set_vaddr(&shadow_map, gdrm->shadow_buf); 401 iosys_map_incr(&shadow_map, drm_fb_clip_offset(fb->pitches[0], fb->format, damage)); 402 drm_fb_memcpy(&shadow_map, fb->pitches, src, fb, damage); 403 404 if (fb != gdrm->fb) { 405 old_fb = gdrm->fb; 406 drm_framebuffer_get(fb); 407 gdrm->fb = fb; 408 } 409 410 gdrm->damage.x1 = min(gdrm->damage.x1, damage->x1); 411 gdrm->damage.y1 = min(gdrm->damage.y1, damage->y1); 412 gdrm->damage.x2 = max(gdrm->damage.x2, damage->x2); 413 gdrm->damage.y2 = max(gdrm->damage.y2, damage->y2); 414 415 mutex_unlock(&gdrm->damage_lock); 416 417 queue_work(system_long_wq, &gdrm->work); 418 419 if (old_fb) 420 drm_framebuffer_put(old_fb); 421 422 return 0; 423 } 424 425 static void gud_fb_handle_damage(struct gud_device *gdrm, struct drm_framebuffer *fb, 426 const struct iosys_map *src, struct drm_rect *damage) 427 { 428 int ret; 429 430 if (gdrm->flags & GUD_DISPLAY_FLAG_FULL_UPDATE) 431 drm_rect_init(damage, 0, 0, fb->width, fb->height); 432 433 if (gud_async_flush) { 434 ret = gud_fb_queue_damage(gdrm, fb, src, damage); 435 if (ret != -ENOMEM) 436 return; 437 } 438 439 /* Imported buffers are assumed to be WriteCombined with uncached reads */ 440 gud_flush_damage(gdrm, fb, src, !fb->obj[0]->import_attach, damage); 441 } 442 443 int gud_pipe_check(struct drm_simple_display_pipe *pipe, 444 struct drm_plane_state *new_plane_state, 445 struct drm_crtc_state *new_crtc_state) 446 { 447 struct gud_device *gdrm = to_gud_device(pipe->crtc.dev); 448 struct drm_plane_state *old_plane_state = pipe->plane.state; 449 const struct drm_display_mode *mode = &new_crtc_state->mode; 450 struct drm_atomic_state *state = new_plane_state->state; 451 struct drm_framebuffer *old_fb = old_plane_state->fb; 452 struct drm_connector_state *connector_state = NULL; 453 struct drm_framebuffer *fb = new_plane_state->fb; 454 const struct drm_format_info *format = fb->format; 455 struct drm_connector *connector; 456 unsigned int i, num_properties; 457 struct gud_state_req *req; 458 int idx, ret; 459 size_t len; 460 461 if (WARN_ON_ONCE(!fb)) 462 return -EINVAL; 463 464 if (old_plane_state->rotation != new_plane_state->rotation) 465 new_crtc_state->mode_changed = true; 466 467 if (old_fb && old_fb->format != format) 468 new_crtc_state->mode_changed = true; 469 470 if (!new_crtc_state->mode_changed && !new_crtc_state->connectors_changed) 471 return 0; 472 473 /* Only one connector is supported */ 474 if (hweight32(new_crtc_state->connector_mask) != 1) 475 return -EINVAL; 476 477 if (format->format == DRM_FORMAT_XRGB8888 && gdrm->xrgb8888_emulation_format) 478 format = gdrm->xrgb8888_emulation_format; 479 480 for_each_new_connector_in_state(state, connector, connector_state, i) { 481 if (connector_state->crtc) 482 break; 483 } 484 485 /* 486 * DRM_IOCTL_MODE_OBJ_SETPROPERTY on the rotation property will not have 487 * the connector included in the state. 488 */ 489 if (!connector_state) { 490 struct drm_connector_list_iter conn_iter; 491 492 drm_connector_list_iter_begin(pipe->crtc.dev, &conn_iter); 493 drm_for_each_connector_iter(connector, &conn_iter) { 494 if (connector->state->crtc) { 495 connector_state = connector->state; 496 break; 497 } 498 } 499 drm_connector_list_iter_end(&conn_iter); 500 } 501 502 if (WARN_ON_ONCE(!connector_state)) 503 return -ENOENT; 504 505 len = struct_size(req, properties, 506 size_add(GUD_PROPERTIES_MAX_NUM, GUD_CONNECTOR_PROPERTIES_MAX_NUM)); 507 req = kzalloc(len, GFP_KERNEL); 508 if (!req) 509 return -ENOMEM; 510 511 gud_from_display_mode(&req->mode, mode); 512 513 req->format = gud_from_fourcc(format->format); 514 if (WARN_ON_ONCE(!req->format)) { 515 ret = -EINVAL; 516 goto out; 517 } 518 519 req->connector = drm_connector_index(connector_state->connector); 520 521 ret = gud_connector_fill_properties(connector_state, req->properties); 522 if (ret < 0) 523 goto out; 524 525 num_properties = ret; 526 for (i = 0; i < gdrm->num_properties; i++) { 527 u16 prop = gdrm->properties[i]; 528 u64 val; 529 530 switch (prop) { 531 case GUD_PROPERTY_ROTATION: 532 /* DRM UAPI matches the protocol so use value directly */ 533 val = new_plane_state->rotation; 534 break; 535 default: 536 WARN_ON_ONCE(1); 537 ret = -EINVAL; 538 goto out; 539 } 540 541 req->properties[num_properties + i].prop = cpu_to_le16(prop); 542 req->properties[num_properties + i].val = cpu_to_le64(val); 543 num_properties++; 544 } 545 546 if (drm_dev_enter(fb->dev, &idx)) { 547 len = struct_size(req, properties, num_properties); 548 ret = gud_usb_set(gdrm, GUD_REQ_SET_STATE_CHECK, 0, req, len); 549 drm_dev_exit(idx); 550 } else { 551 ret = -ENODEV; 552 } 553 out: 554 kfree(req); 555 556 return ret; 557 } 558 559 void gud_pipe_update(struct drm_simple_display_pipe *pipe, 560 struct drm_plane_state *old_state) 561 { 562 struct drm_device *drm = pipe->crtc.dev; 563 struct gud_device *gdrm = to_gud_device(drm); 564 struct drm_plane_state *state = pipe->plane.state; 565 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state); 566 struct drm_framebuffer *fb = state->fb; 567 struct drm_crtc *crtc = &pipe->crtc; 568 struct drm_rect damage; 569 int ret, idx; 570 571 if (crtc->state->mode_changed || !crtc->state->enable) { 572 cancel_work_sync(&gdrm->work); 573 mutex_lock(&gdrm->damage_lock); 574 if (gdrm->fb) { 575 drm_framebuffer_put(gdrm->fb); 576 gdrm->fb = NULL; 577 } 578 gud_clear_damage(gdrm); 579 vfree(gdrm->shadow_buf); 580 gdrm->shadow_buf = NULL; 581 mutex_unlock(&gdrm->damage_lock); 582 } 583 584 if (!drm_dev_enter(drm, &idx)) 585 return; 586 587 if (!old_state->fb) 588 gud_usb_set_u8(gdrm, GUD_REQ_SET_CONTROLLER_ENABLE, 1); 589 590 if (fb && (crtc->state->mode_changed || crtc->state->connectors_changed)) 591 gud_usb_set(gdrm, GUD_REQ_SET_STATE_COMMIT, 0, NULL, 0); 592 593 if (crtc->state->active_changed) 594 gud_usb_set_u8(gdrm, GUD_REQ_SET_DISPLAY_ENABLE, crtc->state->active); 595 596 if (!fb) 597 goto ctrl_disable; 598 599 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); 600 if (ret) 601 goto ctrl_disable; 602 603 if (drm_atomic_helper_damage_merged(old_state, state, &damage)) 604 gud_fb_handle_damage(gdrm, fb, &shadow_plane_state->data[0], &damage); 605 606 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); 607 608 ctrl_disable: 609 if (!crtc->state->enable) 610 gud_usb_set_u8(gdrm, GUD_REQ_SET_CONTROLLER_ENABLE, 0); 611 612 drm_dev_exit(idx); 613 } 614