1 /* 2 * Copyright 2013 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Dave Airlie 23 * Alon Levy 24 */ 25 26 /* QXL cmd/ring handling */ 27 28 #include <linux/delay.h> 29 30 #include <drm/drm_util.h> 31 32 #include "qxl_drv.h" 33 #include "qxl_object.h" 34 35 static int qxl_reap_surface_id(struct qxl_device *qdev, int max_to_reap); 36 37 struct ring { 38 struct qxl_ring_header header; 39 uint8_t elements[]; 40 }; 41 42 struct qxl_ring { 43 struct ring *ring; 44 int element_size; 45 int n_elements; 46 int prod_notify; 47 wait_queue_head_t *push_event; 48 spinlock_t lock; 49 }; 50 51 void qxl_ring_free(struct qxl_ring *ring) 52 { 53 kfree(ring); 54 } 55 56 void qxl_ring_init_hdr(struct qxl_ring *ring) 57 { 58 ring->ring->header.notify_on_prod = ring->n_elements; 59 } 60 61 struct qxl_ring * 62 qxl_ring_create(struct qxl_ring_header *header, 63 int element_size, 64 int n_elements, 65 int prod_notify, 66 bool set_prod_notify, 67 wait_queue_head_t *push_event) 68 { 69 struct qxl_ring *ring; 70 71 ring = kmalloc(sizeof(*ring), GFP_KERNEL); 72 if (!ring) 73 return NULL; 74 75 ring->ring = (struct ring *)header; 76 ring->element_size = element_size; 77 ring->n_elements = n_elements; 78 ring->prod_notify = prod_notify; 79 ring->push_event = push_event; 80 if (set_prod_notify) 81 qxl_ring_init_hdr(ring); 82 spin_lock_init(&ring->lock); 83 return ring; 84 } 85 86 static int qxl_check_header(struct qxl_ring *ring) 87 { 88 int ret; 89 struct qxl_ring_header *header = &(ring->ring->header); 90 unsigned long flags; 91 92 spin_lock_irqsave(&ring->lock, flags); 93 ret = header->prod - header->cons < header->num_items; 94 if (ret == 0) 95 header->notify_on_cons = header->cons + 1; 96 spin_unlock_irqrestore(&ring->lock, flags); 97 return ret; 98 } 99 100 int qxl_check_idle(struct qxl_ring *ring) 101 { 102 int ret; 103 struct qxl_ring_header *header = &(ring->ring->header); 104 unsigned long flags; 105 106 spin_lock_irqsave(&ring->lock, flags); 107 ret = header->prod == header->cons; 108 spin_unlock_irqrestore(&ring->lock, flags); 109 return ret; 110 } 111 112 int qxl_ring_push(struct qxl_ring *ring, 113 const void *new_elt, bool interruptible) 114 { 115 struct qxl_ring_header *header = &(ring->ring->header); 116 uint8_t *elt; 117 int idx, ret; 118 unsigned long flags; 119 120 spin_lock_irqsave(&ring->lock, flags); 121 if (header->prod - header->cons == header->num_items) { 122 header->notify_on_cons = header->cons + 1; 123 mb(); 124 spin_unlock_irqrestore(&ring->lock, flags); 125 if (!drm_can_sleep()) { 126 while (!qxl_check_header(ring)) 127 udelay(1); 128 } else { 129 if (interruptible) { 130 ret = wait_event_interruptible(*ring->push_event, 131 qxl_check_header(ring)); 132 if (ret) 133 return ret; 134 } else { 135 wait_event(*ring->push_event, 136 qxl_check_header(ring)); 137 } 138 139 } 140 spin_lock_irqsave(&ring->lock, flags); 141 } 142 143 idx = header->prod & (ring->n_elements - 1); 144 elt = ring->ring->elements + idx * ring->element_size; 145 146 memcpy((void *)elt, new_elt, ring->element_size); 147 148 header->prod++; 149 150 mb(); 151 152 if (header->prod == header->notify_on_prod) 153 outb(0, ring->prod_notify); 154 155 spin_unlock_irqrestore(&ring->lock, flags); 156 return 0; 157 } 158 159 static bool qxl_ring_pop(struct qxl_ring *ring, 160 void *element) 161 { 162 volatile struct qxl_ring_header *header = &(ring->ring->header); 163 volatile uint8_t *ring_elt; 164 int idx; 165 unsigned long flags; 166 167 spin_lock_irqsave(&ring->lock, flags); 168 if (header->cons == header->prod) { 169 header->notify_on_prod = header->cons + 1; 170 spin_unlock_irqrestore(&ring->lock, flags); 171 return false; 172 } 173 174 idx = header->cons & (ring->n_elements - 1); 175 ring_elt = ring->ring->elements + idx * ring->element_size; 176 177 memcpy(element, (void *)ring_elt, ring->element_size); 178 179 header->cons++; 180 181 spin_unlock_irqrestore(&ring->lock, flags); 182 return true; 183 } 184 185 int 186 qxl_push_command_ring_release(struct qxl_device *qdev, struct qxl_release *release, 187 uint32_t type, bool interruptible) 188 { 189 struct qxl_command cmd; 190 191 cmd.type = type; 192 cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset); 193 194 return qxl_ring_push(qdev->command_ring, &cmd, interruptible); 195 } 196 197 int 198 qxl_push_cursor_ring_release(struct qxl_device *qdev, struct qxl_release *release, 199 uint32_t type, bool interruptible) 200 { 201 struct qxl_command cmd; 202 203 cmd.type = type; 204 cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset); 205 206 return qxl_ring_push(qdev->cursor_ring, &cmd, interruptible); 207 } 208 209 bool qxl_queue_garbage_collect(struct qxl_device *qdev, bool flush) 210 { 211 if (!qxl_check_idle(qdev->release_ring)) { 212 schedule_work(&qdev->gc_work); 213 if (flush) 214 flush_work(&qdev->gc_work); 215 return true; 216 } 217 return false; 218 } 219 220 int qxl_garbage_collect(struct qxl_device *qdev) 221 { 222 struct qxl_release *release; 223 uint64_t id, next_id; 224 int i = 0; 225 union qxl_release_info *info; 226 227 while (qxl_ring_pop(qdev->release_ring, &id)) { 228 DRM_DEBUG_DRIVER("popped %lld\n", id); 229 while (id) { 230 release = qxl_release_from_id_locked(qdev, id); 231 if (release == NULL) 232 break; 233 234 info = qxl_release_map(qdev, release); 235 next_id = info->next; 236 qxl_release_unmap(qdev, release, info); 237 238 DRM_DEBUG_DRIVER("popped %lld, next %lld\n", id, 239 next_id); 240 241 switch (release->type) { 242 case QXL_RELEASE_DRAWABLE: 243 case QXL_RELEASE_SURFACE_CMD: 244 case QXL_RELEASE_CURSOR_CMD: 245 break; 246 default: 247 DRM_ERROR("unexpected release type\n"); 248 break; 249 } 250 id = next_id; 251 252 qxl_release_free(qdev, release); 253 ++i; 254 } 255 } 256 257 DRM_DEBUG_DRIVER("%d\n", i); 258 259 return i; 260 } 261 262 int qxl_alloc_bo_reserved(struct qxl_device *qdev, 263 struct qxl_release *release, 264 unsigned long size, 265 struct qxl_bo **_bo) 266 { 267 struct qxl_bo *bo; 268 int ret; 269 270 ret = qxl_bo_create(qdev, size, false /* not kernel - device */, 271 false, QXL_GEM_DOMAIN_VRAM, NULL, &bo); 272 if (ret) { 273 DRM_ERROR("failed to allocate VRAM BO\n"); 274 return ret; 275 } 276 ret = qxl_release_list_add(release, bo); 277 if (ret) 278 goto out_unref; 279 280 *_bo = bo; 281 return 0; 282 out_unref: 283 qxl_bo_unref(&bo); 284 return ret; 285 } 286 287 static int wait_for_io_cmd_user(struct qxl_device *qdev, uint8_t val, long port, bool intr) 288 { 289 int irq_num; 290 long addr = qdev->io_base + port; 291 int ret; 292 293 mutex_lock(&qdev->async_io_mutex); 294 irq_num = atomic_read(&qdev->irq_received_io_cmd); 295 if (qdev->last_sent_io_cmd > irq_num) { 296 if (intr) 297 ret = wait_event_interruptible_timeout(qdev->io_cmd_event, 298 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ); 299 else 300 ret = wait_event_timeout(qdev->io_cmd_event, 301 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ); 302 /* 0 is timeout, just bail the "hw" has gone away */ 303 if (ret <= 0) 304 goto out; 305 irq_num = atomic_read(&qdev->irq_received_io_cmd); 306 } 307 outb(val, addr); 308 qdev->last_sent_io_cmd = irq_num + 1; 309 if (intr) 310 ret = wait_event_interruptible_timeout(qdev->io_cmd_event, 311 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ); 312 else 313 ret = wait_event_timeout(qdev->io_cmd_event, 314 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ); 315 out: 316 if (ret > 0) 317 ret = 0; 318 mutex_unlock(&qdev->async_io_mutex); 319 return ret; 320 } 321 322 static void wait_for_io_cmd(struct qxl_device *qdev, uint8_t val, long port) 323 { 324 int ret; 325 326 restart: 327 ret = wait_for_io_cmd_user(qdev, val, port, false); 328 if (ret == -ERESTARTSYS) 329 goto restart; 330 } 331 332 int qxl_io_update_area(struct qxl_device *qdev, struct qxl_bo *surf, 333 const struct qxl_rect *area) 334 { 335 int surface_id; 336 uint32_t surface_width, surface_height; 337 int ret; 338 339 if (!surf->hw_surf_alloc) 340 DRM_ERROR("got io update area with no hw surface\n"); 341 342 if (surf->is_primary) 343 surface_id = 0; 344 else 345 surface_id = surf->surface_id; 346 surface_width = surf->surf.width; 347 surface_height = surf->surf.height; 348 349 if (area->left < 0 || area->top < 0 || 350 area->right > surface_width || area->bottom > surface_height) 351 return -EINVAL; 352 353 mutex_lock(&qdev->update_area_mutex); 354 qdev->ram_header->update_area = *area; 355 qdev->ram_header->update_surface = surface_id; 356 ret = wait_for_io_cmd_user(qdev, 0, QXL_IO_UPDATE_AREA_ASYNC, true); 357 mutex_unlock(&qdev->update_area_mutex); 358 return ret; 359 } 360 361 void qxl_io_notify_oom(struct qxl_device *qdev) 362 { 363 outb(0, qdev->io_base + QXL_IO_NOTIFY_OOM); 364 } 365 366 void qxl_io_flush_release(struct qxl_device *qdev) 367 { 368 outb(0, qdev->io_base + QXL_IO_FLUSH_RELEASE); 369 } 370 371 void qxl_io_flush_surfaces(struct qxl_device *qdev) 372 { 373 wait_for_io_cmd(qdev, 0, QXL_IO_FLUSH_SURFACES_ASYNC); 374 } 375 376 void qxl_io_destroy_primary(struct qxl_device *qdev) 377 { 378 wait_for_io_cmd(qdev, 0, QXL_IO_DESTROY_PRIMARY_ASYNC); 379 qdev->primary_bo->is_primary = false; 380 drm_gem_object_put(&qdev->primary_bo->tbo.base); 381 qdev->primary_bo = NULL; 382 } 383 384 void qxl_io_create_primary(struct qxl_device *qdev, struct qxl_bo *bo) 385 { 386 struct qxl_surface_create *create; 387 388 if (WARN_ON(qdev->primary_bo)) 389 return; 390 391 DRM_DEBUG_DRIVER("qdev %p, ram_header %p\n", qdev, qdev->ram_header); 392 create = &qdev->ram_header->create_surface; 393 create->format = bo->surf.format; 394 create->width = bo->surf.width; 395 create->height = bo->surf.height; 396 create->stride = bo->surf.stride; 397 create->mem = qxl_bo_physical_address(qdev, bo, 0); 398 399 DRM_DEBUG_DRIVER("mem = %llx, from %p\n", create->mem, bo->kptr); 400 401 create->flags = QXL_SURF_FLAG_KEEP_DATA; 402 create->type = QXL_SURF_TYPE_PRIMARY; 403 404 wait_for_io_cmd(qdev, 0, QXL_IO_CREATE_PRIMARY_ASYNC); 405 qdev->primary_bo = bo; 406 qdev->primary_bo->is_primary = true; 407 drm_gem_object_get(&qdev->primary_bo->tbo.base); 408 } 409 410 void qxl_io_memslot_add(struct qxl_device *qdev, uint8_t id) 411 { 412 DRM_DEBUG_DRIVER("qxl_memslot_add %d\n", id); 413 wait_for_io_cmd(qdev, id, QXL_IO_MEMSLOT_ADD_ASYNC); 414 } 415 416 void qxl_io_reset(struct qxl_device *qdev) 417 { 418 outb(0, qdev->io_base + QXL_IO_RESET); 419 } 420 421 void qxl_io_monitors_config(struct qxl_device *qdev) 422 { 423 wait_for_io_cmd(qdev, 0, QXL_IO_MONITORS_CONFIG_ASYNC); 424 } 425 426 int qxl_surface_id_alloc(struct qxl_device *qdev, 427 struct qxl_bo *surf) 428 { 429 uint32_t handle; 430 int idr_ret; 431 int count = 0; 432 again: 433 idr_preload(GFP_ATOMIC); 434 spin_lock(&qdev->surf_id_idr_lock); 435 idr_ret = idr_alloc(&qdev->surf_id_idr, NULL, 1, 0, GFP_NOWAIT); 436 spin_unlock(&qdev->surf_id_idr_lock); 437 idr_preload_end(); 438 if (idr_ret < 0) 439 return idr_ret; 440 handle = idr_ret; 441 442 if (handle >= qdev->rom->n_surfaces) { 443 count++; 444 spin_lock(&qdev->surf_id_idr_lock); 445 idr_remove(&qdev->surf_id_idr, handle); 446 spin_unlock(&qdev->surf_id_idr_lock); 447 qxl_reap_surface_id(qdev, 2); 448 goto again; 449 } 450 surf->surface_id = handle; 451 452 spin_lock(&qdev->surf_id_idr_lock); 453 qdev->last_alloced_surf_id = handle; 454 spin_unlock(&qdev->surf_id_idr_lock); 455 return 0; 456 } 457 458 void qxl_surface_id_dealloc(struct qxl_device *qdev, 459 uint32_t surface_id) 460 { 461 spin_lock(&qdev->surf_id_idr_lock); 462 idr_remove(&qdev->surf_id_idr, surface_id); 463 spin_unlock(&qdev->surf_id_idr_lock); 464 } 465 466 int qxl_hw_surface_alloc(struct qxl_device *qdev, 467 struct qxl_bo *surf) 468 { 469 struct qxl_surface_cmd *cmd; 470 struct qxl_release *release; 471 int ret; 472 473 if (surf->hw_surf_alloc) 474 return 0; 475 476 ret = qxl_alloc_surface_release_reserved(qdev, QXL_SURFACE_CMD_CREATE, 477 NULL, 478 &release); 479 if (ret) 480 return ret; 481 482 ret = qxl_release_reserve_list(release, true); 483 if (ret) { 484 qxl_release_free(qdev, release); 485 return ret; 486 } 487 cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release); 488 cmd->type = QXL_SURFACE_CMD_CREATE; 489 cmd->flags = QXL_SURF_FLAG_KEEP_DATA; 490 cmd->u.surface_create.format = surf->surf.format; 491 cmd->u.surface_create.width = surf->surf.width; 492 cmd->u.surface_create.height = surf->surf.height; 493 cmd->u.surface_create.stride = surf->surf.stride; 494 cmd->u.surface_create.data = qxl_bo_physical_address(qdev, surf, 0); 495 cmd->surface_id = surf->surface_id; 496 qxl_release_unmap(qdev, release, &cmd->release_info); 497 498 surf->surf_create = release; 499 500 /* no need to add a release to the fence for this surface bo, 501 since it is only released when we ask to destroy the surface 502 and it would never signal otherwise */ 503 qxl_release_fence_buffer_objects(release); 504 qxl_push_command_ring_release(qdev, release, QXL_CMD_SURFACE, false); 505 506 surf->hw_surf_alloc = true; 507 spin_lock(&qdev->surf_id_idr_lock); 508 idr_replace(&qdev->surf_id_idr, surf, surf->surface_id); 509 spin_unlock(&qdev->surf_id_idr_lock); 510 return 0; 511 } 512 513 int qxl_hw_surface_dealloc(struct qxl_device *qdev, 514 struct qxl_bo *surf) 515 { 516 struct qxl_surface_cmd *cmd; 517 struct qxl_release *release; 518 int ret; 519 int id; 520 521 if (!surf->hw_surf_alloc) 522 return 0; 523 524 ret = qxl_alloc_surface_release_reserved(qdev, QXL_SURFACE_CMD_DESTROY, 525 surf->surf_create, 526 &release); 527 if (ret) 528 return ret; 529 530 surf->surf_create = NULL; 531 /* remove the surface from the idr, but not the surface id yet */ 532 spin_lock(&qdev->surf_id_idr_lock); 533 idr_replace(&qdev->surf_id_idr, NULL, surf->surface_id); 534 spin_unlock(&qdev->surf_id_idr_lock); 535 surf->hw_surf_alloc = false; 536 537 id = surf->surface_id; 538 surf->surface_id = 0; 539 540 release->surface_release_id = id; 541 cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release); 542 cmd->type = QXL_SURFACE_CMD_DESTROY; 543 cmd->surface_id = id; 544 qxl_release_unmap(qdev, release, &cmd->release_info); 545 546 qxl_release_fence_buffer_objects(release); 547 qxl_push_command_ring_release(qdev, release, QXL_CMD_SURFACE, false); 548 549 return 0; 550 } 551 552 static int qxl_update_surface(struct qxl_device *qdev, struct qxl_bo *surf) 553 { 554 struct qxl_rect rect; 555 int ret; 556 557 /* if we are evicting, we need to make sure the surface is up 558 to date */ 559 rect.left = 0; 560 rect.right = surf->surf.width; 561 rect.top = 0; 562 rect.bottom = surf->surf.height; 563 retry: 564 ret = qxl_io_update_area(qdev, surf, &rect); 565 if (ret == -ERESTARTSYS) 566 goto retry; 567 return ret; 568 } 569 570 static void qxl_surface_evict_locked(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area) 571 { 572 /* no need to update area if we are just freeing the surface normally */ 573 if (do_update_area) 574 qxl_update_surface(qdev, surf); 575 576 /* nuke the surface id at the hw */ 577 qxl_hw_surface_dealloc(qdev, surf); 578 } 579 580 void qxl_surface_evict(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area) 581 { 582 mutex_lock(&qdev->surf_evict_mutex); 583 qxl_surface_evict_locked(qdev, surf, do_update_area); 584 mutex_unlock(&qdev->surf_evict_mutex); 585 } 586 587 static int qxl_reap_surf(struct qxl_device *qdev, struct qxl_bo *surf, bool stall) 588 { 589 int ret; 590 591 ret = qxl_bo_reserve(surf); 592 if (ret) 593 return ret; 594 595 if (stall) 596 mutex_unlock(&qdev->surf_evict_mutex); 597 598 ret = ttm_bo_wait(&surf->tbo, true, !stall); 599 600 if (stall) 601 mutex_lock(&qdev->surf_evict_mutex); 602 if (ret) { 603 qxl_bo_unreserve(surf); 604 return ret; 605 } 606 607 qxl_surface_evict_locked(qdev, surf, true); 608 qxl_bo_unreserve(surf); 609 return 0; 610 } 611 612 static int qxl_reap_surface_id(struct qxl_device *qdev, int max_to_reap) 613 { 614 int num_reaped = 0; 615 int i, ret; 616 bool stall = false; 617 int start = 0; 618 619 mutex_lock(&qdev->surf_evict_mutex); 620 again: 621 622 spin_lock(&qdev->surf_id_idr_lock); 623 start = qdev->last_alloced_surf_id + 1; 624 spin_unlock(&qdev->surf_id_idr_lock); 625 626 for (i = start; i < start + qdev->rom->n_surfaces; i++) { 627 void *objptr; 628 int surfid = i % qdev->rom->n_surfaces; 629 630 /* this avoids the case where the objects is in the 631 idr but has been evicted half way - its makes 632 the idr lookup atomic with the eviction */ 633 spin_lock(&qdev->surf_id_idr_lock); 634 objptr = idr_find(&qdev->surf_id_idr, surfid); 635 spin_unlock(&qdev->surf_id_idr_lock); 636 637 if (!objptr) 638 continue; 639 640 ret = qxl_reap_surf(qdev, objptr, stall); 641 if (ret == 0) 642 num_reaped++; 643 if (num_reaped >= max_to_reap) 644 break; 645 } 646 if (num_reaped == 0 && stall == false) { 647 stall = true; 648 goto again; 649 } 650 651 mutex_unlock(&qdev->surf_evict_mutex); 652 if (num_reaped) { 653 usleep_range(500, 1000); 654 qxl_queue_garbage_collect(qdev, true); 655 } 656 657 return 0; 658 } 659