1/* via_dmablit.c -- PCI DMA BitBlt support for the VIA Unichrome/Pro 2 * 3 * Copyright (C) 2005 Thomas Hellstrom, All Rights Reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sub license, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the 13 * next paragraph) shall be included in all copies or substantial portions 14 * of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 22 * USE OR OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: 25 * Thomas Hellstrom. 26 * Partially based on code obtained from Digeo Inc. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32/* 33 * Unmaps the DMA mappings. 34 * FIXME: Is this a NoOp on x86? Also 35 * FIXME: What happens if this one is called and a pending blit has previously done 36 * the same DMA mappings? 37 */ 38 39#include "dev/drm/drmP.h" 40#include "dev/drm/via_drm.h" 41#include "dev/drm/via_drv.h" 42#include "dev/drm/via_dmablit.h" 43 44#define VIA_PGDN(x) (((unsigned long)(x)) & ~PAGE_MASK) 45#define VIA_PGOFF(x) (((unsigned long)(x)) & PAGE_MASK) 46#define VIA_PFN(x) ((unsigned long)(x) >> PAGE_SHIFT) 47 48typedef struct _drm_via_descriptor { 49 uint32_t mem_addr; 50 uint32_t dev_addr; 51 uint32_t size; 52 uint32_t next; 53} drm_via_descriptor_t; 54 55static void via_dmablit_timer(void *arg); 56 57/* 58 * Unmap a DMA mapping. 59 */ 60static void 61via_unmap_blit_from_device(drm_via_sg_info_t *vsg) 62{ 63 int num_desc = vsg->num_desc; 64 unsigned cur_descriptor_page = num_desc / vsg->descriptors_per_page; 65 unsigned descriptor_this_page = num_desc % vsg->descriptors_per_page; 66 drm_via_descriptor_t *desc_ptr = vsg->desc_pages[cur_descriptor_page] + 67 descriptor_this_page; 68 dma_addr_t next = vsg->chain_start; 69 70 while(num_desc--) { 71 if (descriptor_this_page-- == 0) { 72 cur_descriptor_page--; 73 descriptor_this_page = vsg->descriptors_per_page - 1; 74 desc_ptr = vsg->desc_pages[cur_descriptor_page] + 75 descriptor_this_page; 76 } 77 next = (dma_addr_t) desc_ptr->next; 78 desc_ptr--; 79 } 80} 81 82 83/* 84 * If mode = 0, count how many descriptors are needed. 85 * If mode = 1, Map the DMA pages for the device, put together and map also the descriptors. 86 * Descriptors are run in reverse order by the hardware because we are not allowed to update the 87 * 'next' field without syncing calls when the descriptor is already mapped. 88 */ 89static void 90via_map_blit_for_device(const drm_via_dmablit_t *xfer, 91 drm_via_sg_info_t *vsg, int mode) 92{ 93 unsigned cur_descriptor_page = 0; 94 unsigned num_descriptors_this_page = 0; 95 unsigned char *mem_addr = xfer->mem_addr; 96 unsigned char *cur_mem; 97 unsigned char *first_addr = (unsigned char *)VIA_PGDN(mem_addr); 98 uint32_t fb_addr = xfer->fb_addr; 99 uint32_t cur_fb; 100 unsigned long line_len; 101 unsigned remaining_len; 102 int num_desc = 0; 103 int cur_line; 104 dma_addr_t next = 0 | VIA_DMA_DPR_EC; 105 drm_via_descriptor_t *desc_ptr = NULL; 106 107 if (mode == 1) 108 desc_ptr = vsg->desc_pages[cur_descriptor_page]; 109 110 for (cur_line = 0; cur_line < xfer->num_lines; ++cur_line) { 111 112 line_len = xfer->line_length; 113 cur_fb = fb_addr; 114 cur_mem = mem_addr; 115 116 while (line_len > 0) { 117 118 remaining_len = min(PAGE_SIZE - VIA_PGOFF(cur_mem), 119 line_len); 120 line_len -= remaining_len; 121 122 if (mode == 1) { 123 desc_ptr->mem_addr = 124 VM_PAGE_TO_PHYS( 125 vsg->pages[VIA_PFN(cur_mem) - 126 VIA_PFN(first_addr)]) + VIA_PGOFF(cur_mem); 127 desc_ptr->dev_addr = cur_fb; 128 129 desc_ptr->size = remaining_len; 130 desc_ptr->next = (uint32_t) next; 131 132 next = vtophys(desc_ptr); 133 134 desc_ptr++; 135 if (++num_descriptors_this_page >= vsg->descriptors_per_page) { 136 num_descriptors_this_page = 0; 137 desc_ptr = vsg->desc_pages[++cur_descriptor_page]; 138 } 139 } 140 141 num_desc++; 142 cur_mem += remaining_len; 143 cur_fb += remaining_len; 144 } 145 146 mem_addr += xfer->mem_stride; 147 fb_addr += xfer->fb_stride; 148 } 149 150 if (mode == 1) { 151 vsg->chain_start = next; 152 vsg->state = dr_via_device_mapped; 153 } 154 vsg->num_desc = num_desc; 155} 156 157 158/* 159 * Function that frees up all resources for a blit. It is usable even if the 160 * blit info has only been partially built as long as the status enum is consistent 161 * with the actual status of the used resources. 162 */ 163static void 164via_free_sg_info(drm_via_sg_info_t *vsg) 165{ 166 vm_page_t page; 167 int i; 168 169 switch(vsg->state) { 170 case dr_via_device_mapped: 171 via_unmap_blit_from_device(vsg); 172 case dr_via_desc_pages_alloc: 173 for (i=0; i<vsg->num_desc_pages; ++i) { 174 if (vsg->desc_pages[i] != NULL) 175 free(vsg->desc_pages[i], DRM_MEM_PAGES); 176 } 177 free(vsg->desc_pages, DRM_MEM_DRIVER); 178 case dr_via_pages_locked: 179 for (i=0; i < vsg->num_pages; ++i) { 180 page = vsg->pages[i]; 181 vm_page_lock(page); 182 vm_page_unwire(page, PQ_INACTIVE); 183 vm_page_unlock(page); 184 } 185 case dr_via_pages_alloc: 186 free(vsg->pages, DRM_MEM_DRIVER); 187 default: 188 vsg->state = dr_via_sg_init; 189 } 190 free(vsg->bounce_buffer, DRM_MEM_DRIVER); 191 vsg->bounce_buffer = NULL; 192 vsg->free_on_sequence = 0; 193} 194 195 196/* 197 * Fire a blit engine. 198 */ 199static void 200via_fire_dmablit(struct drm_device *dev, drm_via_sg_info_t *vsg, int engine) 201{ 202 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; 203 204 VIA_WRITE(VIA_PCI_DMA_MAR0 + engine*0x10, 0); 205 VIA_WRITE(VIA_PCI_DMA_DAR0 + engine*0x10, 0); 206 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_DD | VIA_DMA_CSR_TD | 207 VIA_DMA_CSR_DE); 208 VIA_WRITE(VIA_PCI_DMA_MR0 + engine*0x04, VIA_DMA_MR_CM | VIA_DMA_MR_TDIE); 209 VIA_WRITE(VIA_PCI_DMA_BCR0 + engine*0x10, 0); 210 VIA_WRITE(VIA_PCI_DMA_DPR0 + engine*0x10, vsg->chain_start); 211 DRM_WRITEMEMORYBARRIER(); 212 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_DE | VIA_DMA_CSR_TS); 213 (void)VIA_READ(VIA_PCI_DMA_CSR0 + engine*0x04); 214} 215 216 217/* 218 * Obtain a page pointer array and lock all pages into system memory. A segmentation violation will 219 * occur here if the calling user does not have access to the submitted address. 220 */ 221static int 222via_lock_all_dma_pages(drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer) 223{ 224 unsigned long first_pfn = VIA_PFN(xfer->mem_addr); 225 vm_page_t m; 226 int i; 227 228 vsg->num_pages = VIA_PFN(xfer->mem_addr + 229 (xfer->num_lines * xfer->mem_stride -1)) - first_pfn + 1; 230 231 if (NULL == (vsg->pages = malloc(sizeof(vm_page_t) * vsg->num_pages, 232 DRM_MEM_DRIVER, M_NOWAIT))) 233 return -ENOMEM; 234 235 vsg->state = dr_via_pages_alloc; 236 237 if (vm_fault_quick_hold_pages(&curproc->p_vmspace->vm_map, 238 (vm_offset_t)xfer->mem_addr, vsg->num_pages * PAGE_SIZE, 239 VM_PROT_READ | VM_PROT_WRITE, vsg->pages, vsg->num_pages) < 0) 240 return -EACCES; 241 242 for (i = 0; i < vsg->num_pages; i++) { 243 m = vsg->pages[i]; 244 vm_page_lock(m); 245 vm_page_wire(m); 246 vm_page_unhold(m); 247 vm_page_unlock(m); 248 } 249 vsg->state = dr_via_pages_locked; 250 251 DRM_DEBUG("DMA pages locked\n"); 252 253 return 0; 254} 255 256 257/* 258 * Allocate DMA capable memory for the blit descriptor chain, and an array that keeps track of the 259 * pages we allocate. We don't want to use kmalloc for the descriptor chain because it may be 260 * quite large for some blits, and pages don't need to be contingous. 261 */ 262static int 263via_alloc_desc_pages(drm_via_sg_info_t *vsg) 264{ 265 int i; 266 267 vsg->descriptors_per_page = PAGE_SIZE / sizeof(drm_via_descriptor_t); 268 vsg->num_desc_pages = (vsg->num_desc + vsg->descriptors_per_page - 1) / 269 vsg->descriptors_per_page; 270 271 if (NULL == (vsg->desc_pages = malloc(vsg->num_desc_pages * 272 sizeof(void *), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO))) 273 return -ENOMEM; 274 275 vsg->state = dr_via_desc_pages_alloc; 276 for (i = 0; i < vsg->num_desc_pages; ++i) { 277 if (NULL == (vsg->desc_pages[i] = 278 (drm_via_descriptor_t *)malloc(PAGE_SIZE, DRM_MEM_PAGES, 279 M_NOWAIT | M_ZERO))) 280 return -ENOMEM; 281 } 282 DRM_DEBUG("Allocated %d pages for %d descriptors.\n", 283 vsg->num_desc_pages, vsg->num_desc); 284 285 return 0; 286} 287 288 289static void 290via_abort_dmablit(struct drm_device *dev, int engine) 291{ 292 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; 293 294 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_TA); 295} 296 297 298static void 299via_dmablit_engine_off(struct drm_device *dev, int engine) 300{ 301 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; 302 303 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_TD | VIA_DMA_CSR_DD); 304} 305 306 307/* 308 * The dmablit part of the IRQ handler. Trying to do only reasonably fast things here. 309 * The rest, like unmapping and freeing memory for done blits is done in a separate workqueue 310 * task. Basically the task of the interrupt handler is to submit a new blit to the engine, while 311 * the workqueue task takes care of processing associated with the old blit. 312 */ 313void 314via_dmablit_handler(struct drm_device *dev, int engine, int from_irq) 315{ 316 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; 317 drm_via_blitq_t *blitq = dev_priv->blit_queues + engine; 318 int cur; 319 int done_transfer; 320 uint32_t status = 0; 321 322 DRM_DEBUG("DMA blit handler called. engine = %d, from_irq = %d, blitq = 0x%lx\n", 323 engine, from_irq, (unsigned long) blitq); 324 325 mtx_lock(&blitq->blit_lock); 326 327 done_transfer = blitq->is_active && 328 (( status = VIA_READ(VIA_PCI_DMA_CSR0 + engine*0x04)) & VIA_DMA_CSR_TD); 329 done_transfer = done_transfer || ( blitq->aborting && !(status & VIA_DMA_CSR_DE)); 330 331 cur = blitq->cur; 332 if (done_transfer) { 333 334 blitq->blits[cur]->aborted = blitq->aborting; 335 blitq->done_blit_handle++; 336 DRM_WAKEUP(&blitq->blit_queue[cur]); 337 338 cur++; 339 if (cur >= VIA_NUM_BLIT_SLOTS) 340 cur = 0; 341 blitq->cur = cur; 342 343 /* 344 * Clear transfer done flag. 345 */ 346 347 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_TD); 348 349 blitq->is_active = 0; 350 blitq->aborting = 0; 351 352 taskqueue_enqueue(taskqueue_swi, &blitq->wq); 353 354 } else if (blitq->is_active && (ticks >= blitq->end)) { 355 356 /* 357 * Abort transfer after one second. 358 */ 359 360 via_abort_dmablit(dev, engine); 361 blitq->aborting = 1; 362 blitq->end = ticks + DRM_HZ; 363 } 364 365 if (!blitq->is_active) { 366 if (blitq->num_outstanding) { 367 via_fire_dmablit(dev, blitq->blits[cur], engine); 368 blitq->is_active = 1; 369 blitq->cur = cur; 370 blitq->num_outstanding--; 371 blitq->end = ticks + DRM_HZ; 372 373 if (!callout_pending(&blitq->poll_timer)) 374 callout_reset(&blitq->poll_timer, 375 1, (timeout_t *)via_dmablit_timer, 376 (void *)blitq); 377 } else { 378 if (callout_pending(&blitq->poll_timer)) { 379 callout_stop(&blitq->poll_timer); 380 } 381 via_dmablit_engine_off(dev, engine); 382 } 383 } 384 385 mtx_unlock(&blitq->blit_lock); 386} 387 388 389/* 390 * Check whether this blit is still active, performing necessary locking. 391 */ 392static int 393via_dmablit_active(drm_via_blitq_t *blitq, int engine, uint32_t handle, wait_queue_head_t **queue) 394{ 395 uint32_t slot; 396 int active; 397 398 mtx_lock(&blitq->blit_lock); 399 400 /* 401 * Allow for handle wraparounds. 402 */ 403 active = ((blitq->done_blit_handle - handle) > (1 << 23)) && 404 ((blitq->cur_blit_handle - handle) <= (1 << 23)); 405 406 if (queue && active) { 407 slot = handle - blitq->done_blit_handle + blitq->cur -1; 408 if (slot >= VIA_NUM_BLIT_SLOTS) { 409 slot -= VIA_NUM_BLIT_SLOTS; 410 } 411 *queue = blitq->blit_queue + slot; 412 } 413 414 mtx_unlock(&blitq->blit_lock); 415 416 return active; 417} 418 419 420/* 421 * Sync. Wait for at least three seconds for the blit to be performed. 422 */ 423static int 424via_dmablit_sync(struct drm_device *dev, uint32_t handle, int engine) 425{ 426 427 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; 428 drm_via_blitq_t *blitq = dev_priv->blit_queues + engine; 429 wait_queue_head_t *queue; 430 int ret = 0; 431 432 if (via_dmablit_active(blitq, engine, handle, &queue)) { 433 DRM_WAIT_ON(ret, *queue, 3 * DRM_HZ, 434 !via_dmablit_active(blitq, engine, handle, NULL)); 435 } 436 DRM_DEBUG("DMA blit sync handle 0x%x engine %d returned %d\n", 437 handle, engine, ret); 438 439 return ret; 440} 441 442 443/* 444 * A timer that regularly polls the blit engine in cases where we don't have interrupts: 445 * a) Broken hardware (typically those that don't have any video capture facility). 446 * b) Blit abort. The hardware doesn't send an interrupt when a blit is aborted. 447 * The timer and hardware IRQ's can and do work in parallel. If the hardware has 448 * irqs, it will shorten the latency somewhat. 449 */ 450static void 451via_dmablit_timer(void *arg) 452{ 453 drm_via_blitq_t *blitq = (drm_via_blitq_t *)arg; 454 struct drm_device *dev = blitq->dev; 455 int engine = (int) 456 (blitq - ((drm_via_private_t *)dev->dev_private)->blit_queues); 457 458 DRM_DEBUG("Polling timer called for engine %d, jiffies %lu\n", engine, 459 (unsigned long) jiffies); 460 461 via_dmablit_handler(dev, engine, 0); 462 463 if (!callout_pending(&blitq->poll_timer)) { 464 callout_schedule(&blitq->poll_timer, 1); 465 466 /* 467 * Rerun handler to delete timer if engines are off, and 468 * to shorten abort latency. This is a little nasty. 469 */ 470 471 via_dmablit_handler(dev, engine, 0); 472 473 } 474} 475 476 477/* 478 * Workqueue task that frees data and mappings associated with a blit. 479 * Also wakes up waiting processes. Each of these tasks handles one 480 * blit engine only and may not be called on each interrupt. 481 */ 482static void 483via_dmablit_workqueue(void *arg, int pending) 484{ 485 drm_via_blitq_t *blitq = (drm_via_blitq_t *)arg; 486 struct drm_device *dev = blitq->dev; 487 drm_via_sg_info_t *cur_sg; 488 int cur_released; 489 490 491 DRM_DEBUG("task called for blit engine %ld\n",(unsigned long) 492 (blitq - ((drm_via_private_t *)dev->dev_private)->blit_queues)); 493 494 mtx_lock(&blitq->blit_lock); 495 496 while(blitq->serviced != blitq->cur) { 497 498 cur_released = blitq->serviced++; 499 500 DRM_DEBUG("Releasing blit slot %d\n", cur_released); 501 502 if (blitq->serviced >= VIA_NUM_BLIT_SLOTS) 503 blitq->serviced = 0; 504 505 cur_sg = blitq->blits[cur_released]; 506 blitq->num_free++; 507 508 mtx_unlock(&blitq->blit_lock); 509 510 DRM_WAKEUP(&blitq->busy_queue); 511 512 via_free_sg_info(cur_sg); 513 free(cur_sg, DRM_MEM_DRIVER); 514 515 mtx_lock(&blitq->blit_lock); 516 } 517 518 mtx_unlock(&blitq->blit_lock); 519} 520 521 522/* 523 * Init all blit engines. Currently we use two, but some hardware have 4. 524 */ 525void 526via_init_dmablit(struct drm_device *dev) 527{ 528 int i,j; 529 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; 530 drm_via_blitq_t *blitq; 531 532 for (i=0; i< VIA_NUM_BLIT_ENGINES; ++i) { 533 blitq = dev_priv->blit_queues + i; 534 blitq->dev = dev; 535 blitq->cur_blit_handle = 0; 536 blitq->done_blit_handle = 0; 537 blitq->head = 0; 538 blitq->cur = 0; 539 blitq->serviced = 0; 540 blitq->num_free = VIA_NUM_BLIT_SLOTS - 1; 541 blitq->num_outstanding = 0; 542 blitq->is_active = 0; 543 blitq->aborting = 0; 544 mtx_init(&blitq->blit_lock, "via_blit_lk", NULL, MTX_DEF); 545 for (j=0; j<VIA_NUM_BLIT_SLOTS; ++j) { 546 DRM_INIT_WAITQUEUE(blitq->blit_queue + j); 547 } 548 DRM_INIT_WAITQUEUE(&blitq->busy_queue); 549 TASK_INIT(&blitq->wq, 0, via_dmablit_workqueue, blitq); 550 callout_init(&blitq->poll_timer, 0); 551 } 552} 553 554 555/* 556 * Build all info and do all mappings required for a blit. 557 */ 558static int 559via_build_sg_info(struct drm_device *dev, drm_via_sg_info_t *vsg, 560 drm_via_dmablit_t *xfer) 561{ 562 int ret = 0; 563 564 vsg->bounce_buffer = NULL; 565 566 vsg->state = dr_via_sg_init; 567 568 if (xfer->num_lines <= 0 || xfer->line_length <= 0) { 569 DRM_ERROR("Zero size bitblt.\n"); 570 return -EINVAL; 571 } 572 573 /* 574 * Below check is a driver limitation, not a hardware one. We 575 * don't want to lock unused pages, and don't want to incoporate the 576 * extra logic of avoiding them. Make sure there are no. 577 * (Not a big limitation anyway.) 578 */ 579 if ((xfer->mem_stride - xfer->line_length) > 2 * PAGE_SIZE) { 580 DRM_ERROR("Too large system memory stride. Stride: %d, " 581 "Length: %d\n", xfer->mem_stride, xfer->line_length); 582 return -EINVAL; 583 } 584 585 if ((xfer->mem_stride == xfer->line_length) && 586 (xfer->fb_stride == xfer->line_length)) { 587 xfer->mem_stride *= xfer->num_lines; 588 xfer->line_length = xfer->mem_stride; 589 xfer->fb_stride = xfer->mem_stride; 590 xfer->num_lines = 1; 591 } 592 593 /* 594 * Don't lock an arbitrary large number of pages, since that causes a 595 * DOS security hole. 596 */ 597 if (xfer->num_lines > 2048 || 598 (xfer->num_lines*xfer->mem_stride > (2048*2048*4))) { 599 DRM_ERROR("Too large PCI DMA bitblt.\n"); 600 return -EINVAL; 601 } 602 603 /* 604 * we allow a negative fb stride to allow flipping of images in 605 * transfer. 606 */ 607 if (xfer->mem_stride < xfer->line_length || 608 abs(xfer->fb_stride) < xfer->line_length) { 609 DRM_ERROR("Invalid frame-buffer / memory stride.\n"); 610 return -EINVAL; 611 } 612 613 /* 614 * A hardware bug seems to be worked around if system memory addresses 615 * start on 16 byte boundaries. This seems a bit restrictive however. 616 * VIA is contacted about this. Meanwhile, impose the following 617 * restrictions: 618 */ 619#ifdef VIA_BUGFREE 620 if ((((unsigned long)xfer->mem_addr & 3) != 621 ((unsigned long)xfer->fb_addr & 3)) || 622 ((xfer->num_lines > 1) && ((xfer->mem_stride & 3) != 623 (xfer->fb_stride & 3)))) { 624 DRM_ERROR("Invalid DRM bitblt alignment.\n"); 625 return -EINVAL; 626 } 627#else 628 if ((((unsigned long)xfer->mem_addr & 15) || 629 ((unsigned long)xfer->fb_addr & 3)) || 630 ((xfer->num_lines > 1) && 631 ((xfer->mem_stride & 15) || (xfer->fb_stride & 3)))) { 632 DRM_ERROR("Invalid DRM bitblt alignment.\n"); 633 return -EINVAL; 634 } 635#endif 636 637 if (0 != (ret = via_lock_all_dma_pages(vsg, xfer))) { 638 DRM_ERROR("Could not lock DMA pages.\n"); 639 via_free_sg_info(vsg); 640 return ret; 641 } 642 643 via_map_blit_for_device(xfer, vsg, 0); 644 if (0 != (ret = via_alloc_desc_pages(vsg))) { 645 DRM_ERROR("Could not allocate DMA descriptor pages.\n"); 646 via_free_sg_info(vsg); 647 return ret; 648 } 649 via_map_blit_for_device(xfer, vsg, 1); 650 651 return 0; 652} 653 654 655/* 656 * Reserve one free slot in the blit queue. Will wait for one second for one 657 * to become available. Otherwise -EBUSY is returned. 658 */ 659static int 660via_dmablit_grab_slot(drm_via_blitq_t *blitq, int engine) 661{ 662 struct drm_device *dev = blitq->dev; 663 int ret=0; 664 665 DRM_DEBUG("Num free is %d\n", blitq->num_free); 666 mtx_lock(&blitq->blit_lock); 667 while(blitq->num_free == 0) { 668 mtx_unlock(&blitq->blit_lock); 669 670 DRM_WAIT_ON(ret, blitq->busy_queue, DRM_HZ, 671 blitq->num_free > 0); 672 if (ret) { 673 return (-EINTR == ret) ? -EAGAIN : ret; 674 } 675 676 mtx_lock(&blitq->blit_lock); 677 } 678 679 blitq->num_free--; 680 mtx_unlock(&blitq->blit_lock); 681 682 return 0; 683} 684 685 686/* 687 * Hand back a free slot if we changed our mind. 688 */ 689static void 690via_dmablit_release_slot(drm_via_blitq_t *blitq) 691{ 692 693 mtx_lock(&blitq->blit_lock); 694 blitq->num_free++; 695 mtx_unlock(&blitq->blit_lock); 696 DRM_WAKEUP( &blitq->busy_queue ); 697} 698 699 700/* 701 * Grab a free slot. Build blit info and queue a blit. 702 */ 703static int 704via_dmablit(struct drm_device *dev, drm_via_dmablit_t *xfer) 705{ 706 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private; 707 drm_via_sg_info_t *vsg; 708 drm_via_blitq_t *blitq; 709 int ret; 710 int engine; 711 712 if (dev_priv == NULL) { 713 DRM_ERROR("Called without initialization.\n"); 714 return -EINVAL; 715 } 716 717 engine = (xfer->to_fb) ? 0 : 1; 718 blitq = dev_priv->blit_queues + engine; 719 if (0 != (ret = via_dmablit_grab_slot(blitq, engine))) { 720 return ret; 721 } 722 if (NULL == (vsg = malloc(sizeof(*vsg), DRM_MEM_DRIVER, 723 M_NOWAIT | M_ZERO))) { 724 via_dmablit_release_slot(blitq); 725 return -ENOMEM; 726 } 727 if (0 != (ret = via_build_sg_info(dev, vsg, xfer))) { 728 via_dmablit_release_slot(blitq); 729 free(vsg, DRM_MEM_DRIVER); 730 return ret; 731 } 732 mtx_lock(&blitq->blit_lock); 733 734 blitq->blits[blitq->head++] = vsg; 735 if (blitq->head >= VIA_NUM_BLIT_SLOTS) 736 blitq->head = 0; 737 blitq->num_outstanding++; 738 xfer->sync.sync_handle = ++blitq->cur_blit_handle; 739 740 mtx_unlock(&blitq->blit_lock); 741 xfer->sync.engine = engine; 742 743 via_dmablit_handler(dev, engine, 0); 744 745 return 0; 746} 747 748 749/* 750 * Sync on a previously submitted blit. Note that the X server use signals 751 * extensively, and that there is a very big probability that this IOCTL will 752 * be interrupted by a signal. In that case it returns with -EAGAIN for the 753 * signal to be delivered. The caller should then reissue the IOCTL. This is 754 * similar to what is being done for drmGetLock(). 755 */ 756int 757via_dma_blit_sync( struct drm_device *dev, void *data, 758 struct drm_file *file_priv ) 759{ 760 drm_via_blitsync_t *sync = data; 761 int err; 762 763 if (sync->engine >= VIA_NUM_BLIT_ENGINES) 764 return -EINVAL; 765 766 err = via_dmablit_sync(dev, sync->sync_handle, sync->engine); 767 768 if (-EINTR == err) 769 err = -EAGAIN; 770 771 return err; 772} 773 774 775/* 776 * Queue a blit and hand back a handle to be used for sync. This IOCTL may be 777 * interrupted by a signal while waiting for a free slot in the blit queue. 778 * In that case it returns with -EAGAIN and should be reissued. See the above 779 * IOCTL code. 780 */ 781int 782via_dma_blit( struct drm_device *dev, void *data, struct drm_file *file_priv ) 783{ 784 drm_via_dmablit_t *xfer = data; 785 int err; 786 787 err = via_dmablit(dev, xfer); 788 789 return err; 790} 791