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 struct qxl_ring * 57 qxl_ring_create(struct qxl_ring_header *header, 58 int element_size, 59 int n_elements, 60 int prod_notify, 61 wait_queue_head_t *push_event) 62 { 63 struct qxl_ring *ring; 64 65 ring = kmalloc(sizeof(*ring), GFP_KERNEL); 66 if (!ring) 67 return NULL; 68 69 ring->ring = (struct ring *)header; 70 ring->element_size = element_size; 71 ring->n_elements = n_elements; 72 ring->prod_notify = prod_notify; 73 ring->push_event = push_event; 74 spin_lock_init(&ring->lock); 75 return ring; 76 } 77 78 static int qxl_check_header(struct qxl_ring *ring) 79 { 80 int ret; 81 struct qxl_ring_header *header = &(ring->ring->header); 82 unsigned long flags; 83 84 spin_lock_irqsave(&ring->lock, flags); 85 ret = header->prod - header->cons < header->num_items; 86 if (ret == 0) 87 header->notify_on_cons = header->cons + 1; 88 spin_unlock_irqrestore(&ring->lock, flags); 89 return ret; 90 } 91 92 int qxl_check_idle(struct qxl_ring *ring) 93 { 94 int ret; 95 struct qxl_ring_header *header = &(ring->ring->header); 96 unsigned long flags; 97 98 spin_lock_irqsave(&ring->lock, flags); 99 ret = header->prod == header->cons; 100 spin_unlock_irqrestore(&ring->lock, flags); 101 return ret; 102 } 103 104 int qxl_ring_push(struct qxl_ring *ring, 105 const void *new_elt, bool interruptible) 106 { 107 struct qxl_ring_header *header = &(ring->ring->header); 108 uint8_t *elt; 109 int idx, ret; 110 unsigned long flags; 111 112 spin_lock_irqsave(&ring->lock, flags); 113 if (header->prod - header->cons == header->num_items) { 114 header->notify_on_cons = header->cons + 1; 115 mb(); 116 spin_unlock_irqrestore(&ring->lock, flags); 117 if (!drm_can_sleep()) { 118 while (!qxl_check_header(ring)) 119 udelay(1); 120 } else { 121 if (interruptible) { 122 ret = wait_event_interruptible(*ring->push_event, 123 qxl_check_header(ring)); 124 if (ret) 125 return ret; 126 } else { 127 wait_event(*ring->push_event, 128 qxl_check_header(ring)); 129 } 130 131 } 132 spin_lock_irqsave(&ring->lock, flags); 133 } 134 135 idx = header->prod & (ring->n_elements - 1); 136 elt = ring->ring->elements + idx * ring->element_size; 137 138 memcpy((void *)elt, new_elt, ring->element_size); 139 140 header->prod++; 141 142 mb(); 143 144 if (header->prod == header->notify_on_prod) 145 outb(0, ring->prod_notify); 146 147 spin_unlock_irqrestore(&ring->lock, flags); 148 return 0; 149 } 150 151 static bool qxl_ring_pop(struct qxl_ring *ring, 152 void *element) 153 { 154 volatile struct qxl_ring_header *header = &(ring->ring->header); 155 volatile uint8_t *ring_elt; 156 int idx; 157 unsigned long flags; 158 159 spin_lock_irqsave(&ring->lock, flags); 160 if (header->cons == header->prod) { 161 header->notify_on_prod = header->cons + 1; 162 spin_unlock_irqrestore(&ring->lock, flags); 163 return false; 164 } 165 166 idx = header->cons & (ring->n_elements - 1); 167 ring_elt = ring->ring->elements + idx * ring->element_size; 168 169 memcpy(element, (void *)ring_elt, ring->element_size); 170 171 header->cons++; 172 173 spin_unlock_irqrestore(&ring->lock, flags); 174 return true; 175 } 176 177 int 178 qxl_push_command_ring_release(struct qxl_device *qdev, struct qxl_release *release, 179 uint32_t type, bool interruptible) 180 { 181 struct qxl_command cmd; 182 183 cmd.type = type; 184 cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset); 185 186 return qxl_ring_push(qdev->command_ring, &cmd, interruptible); 187 } 188 189 int 190 qxl_push_cursor_ring_release(struct qxl_device *qdev, struct qxl_release *release, 191 uint32_t type, bool interruptible) 192 { 193 struct qxl_command cmd; 194 195 cmd.type = type; 196 cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset); 197 198 return qxl_ring_push(qdev->cursor_ring, &cmd, interruptible); 199 } 200 201 bool qxl_queue_garbage_collect(struct qxl_device *qdev, bool flush) 202 { 203 if (!qxl_check_idle(qdev->release_ring)) { 204 schedule_work(&qdev->gc_work); 205 if (flush) 206 flush_work(&qdev->gc_work); 207 return true; 208 } 209 return false; 210 } 211 212 int qxl_garbage_collect(struct qxl_device *qdev) 213 { 214 struct qxl_release *release; 215 uint64_t id, next_id; 216 int i = 0; 217 union qxl_release_info *info; 218 219 while (qxl_ring_pop(qdev->release_ring, &id)) { 220 DRM_DEBUG_DRIVER("popped %lld\n", id); 221 while (id) { 222 release = qxl_release_from_id_locked(qdev, id); 223 if (release == NULL) 224 break; 225 226 info = qxl_release_map(qdev, release); 227 next_id = info->next; 228 qxl_release_unmap(qdev, release, info); 229 230 DRM_DEBUG_DRIVER("popped %lld, next %lld\n", id, 231 next_id); 232 233 switch (release->type) { 234 case QXL_RELEASE_DRAWABLE: 235 case QXL_RELEASE_SURFACE_CMD: 236 case QXL_RELEASE_CURSOR_CMD: 237 break; 238 default: 239 DRM_ERROR("unexpected release type\n"); 240 break; 241 } 242 id = next_id; 243 244 qxl_release_free(qdev, release); 245 ++i; 246 } 247 } 248 249 wake_up_all(&qdev->release_event); 250 DRM_DEBUG_DRIVER("%d\n", i); 251 252 return i; 253 } 254 255 int qxl_alloc_bo_reserved(struct qxl_device *qdev, 256 struct qxl_release *release, 257 unsigned long size, 258 struct qxl_bo **_bo) 259 { 260 struct qxl_bo *bo; 261 int ret; 262 263 ret = qxl_bo_create(qdev, size, false /* not kernel - device */, 264 false, QXL_GEM_DOMAIN_VRAM, 0, NULL, &bo); 265 if (ret) { 266 DRM_ERROR("failed to allocate VRAM BO\n"); 267 return ret; 268 } 269 ret = qxl_release_list_add(release, bo); 270 if (ret) 271 goto out_unref; 272 273 *_bo = bo; 274 return 0; 275 out_unref: 276 qxl_bo_unref(&bo); 277 return ret; 278 } 279 280 static int wait_for_io_cmd_user(struct qxl_device *qdev, uint8_t val, long port, bool intr) 281 { 282 int irq_num; 283 long addr = qdev->io_base + port; 284 int ret; 285 286 mutex_lock(&qdev->async_io_mutex); 287 irq_num = atomic_read(&qdev->irq_received_io_cmd); 288 if (qdev->last_sent_io_cmd > irq_num) { 289 if (intr) 290 ret = wait_event_interruptible_timeout(qdev->io_cmd_event, 291 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ); 292 else 293 ret = wait_event_timeout(qdev->io_cmd_event, 294 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ); 295 /* 0 is timeout, just bail the "hw" has gone away */ 296 if (ret <= 0) 297 goto out; 298 irq_num = atomic_read(&qdev->irq_received_io_cmd); 299 } 300 outb(val, addr); 301 qdev->last_sent_io_cmd = irq_num + 1; 302 if (intr) 303 ret = wait_event_interruptible_timeout(qdev->io_cmd_event, 304 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ); 305 else 306 ret = wait_event_timeout(qdev->io_cmd_event, 307 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ); 308 out: 309 if (ret > 0) 310 ret = 0; 311 mutex_unlock(&qdev->async_io_mutex); 312 return ret; 313 } 314 315 static void wait_for_io_cmd(struct qxl_device *qdev, uint8_t val, long port) 316 { 317 int ret; 318 319 restart: 320 ret = wait_for_io_cmd_user(qdev, val, port, false); 321 if (ret == -ERESTARTSYS) 322 goto restart; 323 } 324 325 int qxl_io_update_area(struct qxl_device *qdev, struct qxl_bo *surf, 326 const struct qxl_rect *area) 327 { 328 int surface_id; 329 uint32_t surface_width, surface_height; 330 int ret; 331 332 if (!surf->hw_surf_alloc) 333 DRM_ERROR("got io update area with no hw surface\n"); 334 335 if (surf->is_primary) 336 surface_id = 0; 337 else 338 surface_id = surf->surface_id; 339 surface_width = surf->surf.width; 340 surface_height = surf->surf.height; 341 342 if (area->left < 0 || area->top < 0 || 343 area->right > surface_width || area->bottom > surface_height) 344 return -EINVAL; 345 346 mutex_lock(&qdev->update_area_mutex); 347 qdev->ram_header->update_area = *area; 348 qdev->ram_header->update_surface = surface_id; 349 ret = wait_for_io_cmd_user(qdev, 0, QXL_IO_UPDATE_AREA_ASYNC, true); 350 mutex_unlock(&qdev->update_area_mutex); 351 return ret; 352 } 353 354 void qxl_io_notify_oom(struct qxl_device *qdev) 355 { 356 outb(0, qdev->io_base + QXL_IO_NOTIFY_OOM); 357 } 358 359 void qxl_io_flush_release(struct qxl_device *qdev) 360 { 361 outb(0, qdev->io_base + QXL_IO_FLUSH_RELEASE); 362 } 363 364 void qxl_io_flush_surfaces(struct qxl_device *qdev) 365 { 366 wait_for_io_cmd(qdev, 0, QXL_IO_FLUSH_SURFACES_ASYNC); 367 } 368 369 void qxl_io_destroy_primary(struct qxl_device *qdev) 370 { 371 wait_for_io_cmd(qdev, 0, QXL_IO_DESTROY_PRIMARY_ASYNC); 372 qdev->primary_bo->is_primary = false; 373 drm_gem_object_put(&qdev->primary_bo->tbo.base); 374 qdev->primary_bo = NULL; 375 } 376 377 void qxl_io_create_primary(struct qxl_device *qdev, struct qxl_bo *bo) 378 { 379 struct qxl_surface_create *create; 380 381 if (WARN_ON(qdev->primary_bo)) 382 return; 383 384 DRM_DEBUG_DRIVER("qdev %p, ram_header %p\n", qdev, qdev->ram_header); 385 create = &qdev->ram_header->create_surface; 386 create->format = bo->surf.format; 387 create->width = bo->surf.width; 388 create->height = bo->surf.height; 389 create->stride = bo->surf.stride; 390 create->mem = qxl_bo_physical_address(qdev, bo, 0); 391 392 DRM_DEBUG_DRIVER("mem = %llx, from %p\n", create->mem, bo->kptr); 393 394 create->flags = QXL_SURF_FLAG_KEEP_DATA; 395 create->type = QXL_SURF_TYPE_PRIMARY; 396 397 wait_for_io_cmd(qdev, 0, QXL_IO_CREATE_PRIMARY_ASYNC); 398 qdev->primary_bo = bo; 399 qdev->primary_bo->is_primary = true; 400 drm_gem_object_get(&qdev->primary_bo->tbo.base); 401 } 402 403 void qxl_io_memslot_add(struct qxl_device *qdev, uint8_t id) 404 { 405 DRM_DEBUG_DRIVER("qxl_memslot_add %d\n", id); 406 wait_for_io_cmd(qdev, id, QXL_IO_MEMSLOT_ADD_ASYNC); 407 } 408 409 void qxl_io_reset(struct qxl_device *qdev) 410 { 411 outb(0, qdev->io_base + QXL_IO_RESET); 412 } 413 414 void qxl_io_monitors_config(struct qxl_device *qdev) 415 { 416 wait_for_io_cmd(qdev, 0, QXL_IO_MONITORS_CONFIG_ASYNC); 417 } 418 419 int qxl_surface_id_alloc(struct qxl_device *qdev, 420 struct qxl_bo *surf) 421 { 422 uint32_t handle; 423 int idr_ret; 424 again: 425 idr_preload(GFP_ATOMIC); 426 spin_lock(&qdev->surf_id_idr_lock); 427 idr_ret = idr_alloc(&qdev->surf_id_idr, NULL, 1, 0, GFP_NOWAIT); 428 spin_unlock(&qdev->surf_id_idr_lock); 429 idr_preload_end(); 430 if (idr_ret < 0) 431 return idr_ret; 432 handle = idr_ret; 433 434 if (handle >= qdev->rom->n_surfaces) { 435 spin_lock(&qdev->surf_id_idr_lock); 436 idr_remove(&qdev->surf_id_idr, handle); 437 spin_unlock(&qdev->surf_id_idr_lock); 438 qxl_reap_surface_id(qdev, 2); 439 goto again; 440 } 441 surf->surface_id = handle; 442 443 spin_lock(&qdev->surf_id_idr_lock); 444 qdev->last_alloced_surf_id = handle; 445 spin_unlock(&qdev->surf_id_idr_lock); 446 return 0; 447 } 448 449 void qxl_surface_id_dealloc(struct qxl_device *qdev, 450 uint32_t surface_id) 451 { 452 spin_lock(&qdev->surf_id_idr_lock); 453 idr_remove(&qdev->surf_id_idr, surface_id); 454 spin_unlock(&qdev->surf_id_idr_lock); 455 } 456 457 int qxl_hw_surface_alloc(struct qxl_device *qdev, 458 struct qxl_bo *surf) 459 { 460 struct qxl_surface_cmd *cmd; 461 struct qxl_release *release; 462 int ret; 463 464 if (surf->hw_surf_alloc) 465 return 0; 466 467 ret = qxl_alloc_surface_release_reserved(qdev, QXL_SURFACE_CMD_CREATE, 468 NULL, 469 &release); 470 if (ret) 471 return ret; 472 473 ret = qxl_release_reserve_list(release, true); 474 if (ret) { 475 qxl_release_free(qdev, release); 476 return ret; 477 } 478 cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release); 479 cmd->type = QXL_SURFACE_CMD_CREATE; 480 cmd->flags = QXL_SURF_FLAG_KEEP_DATA; 481 cmd->u.surface_create.format = surf->surf.format; 482 cmd->u.surface_create.width = surf->surf.width; 483 cmd->u.surface_create.height = surf->surf.height; 484 cmd->u.surface_create.stride = surf->surf.stride; 485 cmd->u.surface_create.data = qxl_bo_physical_address(qdev, surf, 0); 486 cmd->surface_id = surf->surface_id; 487 qxl_release_unmap(qdev, release, &cmd->release_info); 488 489 surf->surf_create = release; 490 491 /* no need to add a release to the fence for this surface bo, 492 since it is only released when we ask to destroy the surface 493 and it would never signal otherwise */ 494 qxl_release_fence_buffer_objects(release); 495 qxl_push_command_ring_release(qdev, release, QXL_CMD_SURFACE, false); 496 497 surf->hw_surf_alloc = true; 498 spin_lock(&qdev->surf_id_idr_lock); 499 idr_replace(&qdev->surf_id_idr, surf, surf->surface_id); 500 spin_unlock(&qdev->surf_id_idr_lock); 501 return 0; 502 } 503 504 int qxl_hw_surface_dealloc(struct qxl_device *qdev, 505 struct qxl_bo *surf) 506 { 507 struct qxl_surface_cmd *cmd; 508 struct qxl_release *release; 509 int ret; 510 int id; 511 512 if (!surf->hw_surf_alloc) 513 return 0; 514 515 ret = qxl_alloc_surface_release_reserved(qdev, QXL_SURFACE_CMD_DESTROY, 516 surf->surf_create, 517 &release); 518 if (ret) 519 return ret; 520 521 surf->surf_create = NULL; 522 /* remove the surface from the idr, but not the surface id yet */ 523 spin_lock(&qdev->surf_id_idr_lock); 524 idr_replace(&qdev->surf_id_idr, NULL, surf->surface_id); 525 spin_unlock(&qdev->surf_id_idr_lock); 526 surf->hw_surf_alloc = false; 527 528 id = surf->surface_id; 529 surf->surface_id = 0; 530 531 release->surface_release_id = id; 532 cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release); 533 cmd->type = QXL_SURFACE_CMD_DESTROY; 534 cmd->surface_id = id; 535 qxl_release_unmap(qdev, release, &cmd->release_info); 536 537 qxl_release_fence_buffer_objects(release); 538 qxl_push_command_ring_release(qdev, release, QXL_CMD_SURFACE, false); 539 540 return 0; 541 } 542 543 static int qxl_update_surface(struct qxl_device *qdev, struct qxl_bo *surf) 544 { 545 struct qxl_rect rect; 546 int ret; 547 548 /* if we are evicting, we need to make sure the surface is up 549 to date */ 550 rect.left = 0; 551 rect.right = surf->surf.width; 552 rect.top = 0; 553 rect.bottom = surf->surf.height; 554 retry: 555 ret = qxl_io_update_area(qdev, surf, &rect); 556 if (ret == -ERESTARTSYS) 557 goto retry; 558 return ret; 559 } 560 561 static void qxl_surface_evict_locked(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area) 562 { 563 /* no need to update area if we are just freeing the surface normally */ 564 if (do_update_area) 565 qxl_update_surface(qdev, surf); 566 567 /* nuke the surface id at the hw */ 568 qxl_hw_surface_dealloc(qdev, surf); 569 } 570 571 void qxl_surface_evict(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area) 572 { 573 mutex_lock(&qdev->surf_evict_mutex); 574 qxl_surface_evict_locked(qdev, surf, do_update_area); 575 mutex_unlock(&qdev->surf_evict_mutex); 576 } 577 578 static int qxl_reap_surf(struct qxl_device *qdev, struct qxl_bo *surf, bool stall) 579 { 580 long ret; 581 582 ret = qxl_bo_reserve(surf); 583 if (ret) 584 return ret; 585 586 if (stall) 587 mutex_unlock(&qdev->surf_evict_mutex); 588 589 if (stall) { 590 ret = dma_resv_wait_timeout(surf->tbo.base.resv, 591 DMA_RESV_USAGE_BOOKKEEP, true, 592 15 * HZ); 593 if (ret > 0) 594 ret = 0; 595 else if (ret == 0) 596 ret = -EBUSY; 597 } else { 598 ret = dma_resv_test_signaled(surf->tbo.base.resv, 599 DMA_RESV_USAGE_BOOKKEEP); 600 ret = ret ? -EBUSY : 0; 601 } 602 603 if (stall) 604 mutex_lock(&qdev->surf_evict_mutex); 605 if (ret) { 606 qxl_bo_unreserve(surf); 607 return ret; 608 } 609 610 qxl_surface_evict_locked(qdev, surf, true); 611 qxl_bo_unreserve(surf); 612 return 0; 613 } 614 615 static int qxl_reap_surface_id(struct qxl_device *qdev, int max_to_reap) 616 { 617 int num_reaped = 0; 618 int i, ret; 619 bool stall = false; 620 int start = 0; 621 622 mutex_lock(&qdev->surf_evict_mutex); 623 again: 624 625 spin_lock(&qdev->surf_id_idr_lock); 626 start = qdev->last_alloced_surf_id + 1; 627 spin_unlock(&qdev->surf_id_idr_lock); 628 629 for (i = start; i < start + qdev->rom->n_surfaces; i++) { 630 void *objptr; 631 int surfid = i % qdev->rom->n_surfaces; 632 633 /* this avoids the case where the objects is in the 634 idr but has been evicted half way - its makes 635 the idr lookup atomic with the eviction */ 636 spin_lock(&qdev->surf_id_idr_lock); 637 objptr = idr_find(&qdev->surf_id_idr, surfid); 638 spin_unlock(&qdev->surf_id_idr_lock); 639 640 if (!objptr) 641 continue; 642 643 ret = qxl_reap_surf(qdev, objptr, stall); 644 if (ret == 0) 645 num_reaped++; 646 if (num_reaped >= max_to_reap) 647 break; 648 } 649 if (num_reaped == 0 && stall == false) { 650 stall = true; 651 goto again; 652 } 653 654 mutex_unlock(&qdev->surf_evict_mutex); 655 if (num_reaped) { 656 usleep_range(500, 1000); 657 qxl_queue_garbage_collect(qdev, true); 658 } 659 660 return 0; 661 } 662