sys/dev/drm/mga_dma.c

   1 /* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
   2  * Created: Mon Dec 13 01:50:01 1999 by jhartmann@precisioninsight.com */
   3 /*-
   4  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   6  * All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the next
  16  * paragraph) shall be included in all copies or substantial portions of the
  17  * Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  25  * DEALINGS IN THE SOFTWARE.
  26  *
  27  * Authors:
  28  *    Rickard E. (Rik) Faith <faith@valinux.com>
  29  *    Jeff Hartmann <jhartmann@valinux.com>
  30  *    Keith Whitwell <keith@tungstengraphics.com>
  31  *
  32  * Rewritten by:
  33  *    Gareth Hughes <gareth@valinux.com>
  34  *
  35  * $FreeBSD$
  36  */
  37
  38 #include "dev/drm/drmP.h"
  39 #include "dev/drm/drm.h"
  40 #include "dev/drm/mga_drm.h"
  41 #include "dev/drm/mga_drv.h"
  42
  43 #define MGA_DEFAULT_USEC_TIMEOUT        10000
  44 #define MGA_FREELIST_DEBUG              0
  45
  46 static int mga_do_cleanup_dma(drm_device_t * dev);
  47
  48 /* ================================================================
  49  * Engine control
  50  */
  51
  52 int mga_do_wait_for_idle(drm_mga_private_t * dev_priv)
  53 {
  54         u32 status = 0;
  55         int i;
  56         DRM_DEBUG("\n");
  57
  58         for (i = 0; i < dev_priv->usec_timeout; i++) {
  59                 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
  60                 if (status == MGA_ENDPRDMASTS) {
  61                         MGA_WRITE8(MGA_CRTC_INDEX, 0);
  62                         return 0;
  63                 }
  64                 DRM_UDELAY(1);
  65         }
  66
  67 #if MGA_DMA_DEBUG
  68         DRM_ERROR("failed!\n");
  69         DRM_INFO("   status=0x%08x\n", status);
  70 #endif
  71         return DRM_ERR(EBUSY);
  72 }
  73
  74 static int mga_do_dma_reset(drm_mga_private_t * dev_priv)
  75 {
  76         drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
  77         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
  78
  79         DRM_DEBUG("\n");
  80
  81         /* The primary DMA stream should look like new right about now.
  82          */
  83         primary->tail = 0;
  84         primary->space = primary->size;
  85         primary->last_flush = 0;
  86
  87         sarea_priv->last_wrap = 0;
  88
  89         /* FIXME: Reset counters, buffer ages etc...
  90          */
  91
  92         /* FIXME: What else do we need to reinitialize?  WARP stuff?
  93          */
  94
  95         return 0;
  96 }
  97
  98 /* ================================================================
  99  * Primary DMA stream
 100  */
 101
 102 void mga_do_dma_flush(drm_mga_private_t * dev_priv)
 103 {
 104         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 105         u32 head, tail;
 106         u32 status = 0;
 107         int i;
 108         DMA_LOCALS;
 109         DRM_DEBUG("\n");
 110
 111         /* We need to wait so that we can do an safe flush */
 112         for (i = 0; i < dev_priv->usec_timeout; i++) {
 113                 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
 114                 if (status == MGA_ENDPRDMASTS)
 115                         break;
 116                 DRM_UDELAY(1);
 117         }
 118
 119         if (primary->tail == primary->last_flush) {
 120                 DRM_DEBUG("   bailing out...\n");
 121                 return;
 122         }
 123
 124         tail = primary->tail + dev_priv->primary->offset;
 125
 126         /* We need to pad the stream between flushes, as the card
 127          * actually (partially?) reads the first of these commands.
 128          * See page 4-16 in the G400 manual, middle of the page or so.
 129          */
 130         BEGIN_DMA(1);
 131
 132         DMA_BLOCK(MGA_DMAPAD, 0x00000000,
 133                   MGA_DMAPAD, 0x00000000,
 134                   MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
 135
 136         ADVANCE_DMA();
 137
 138         primary->last_flush = primary->tail;
 139
 140         head = MGA_READ(MGA_PRIMADDRESS);
 141
 142         if (head <= tail) {
 143                 primary->space = primary->size - primary->tail;
 144         } else {
 145                 primary->space = head - tail;
 146         }
 147
 148         DRM_DEBUG("   head = 0x%06lx\n", head - dev_priv->primary->offset);
 149         DRM_DEBUG("   tail = 0x%06lx\n", tail - dev_priv->primary->offset);
 150         DRM_DEBUG("  space = 0x%06x\n", primary->space);
 151
 152         mga_flush_write_combine();
 153         MGA_WRITE(MGA_PRIMEND, tail | MGA_PAGPXFER);
 154
 155         DRM_DEBUG("done.\n");
 156 }
 157
 158 void mga_do_dma_wrap_start(drm_mga_private_t * dev_priv)
 159 {
 160         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 161         u32 head, tail;
 162         DMA_LOCALS;
 163         DRM_DEBUG("\n");
 164
 165         BEGIN_DMA_WRAP();
 166
 167         DMA_BLOCK(MGA_DMAPAD, 0x00000000,
 168                   MGA_DMAPAD, 0x00000000,
 169                   MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
 170
 171         ADVANCE_DMA();
 172
 173         tail = primary->tail + dev_priv->primary->offset;
 174
 175         primary->tail = 0;
 176         primary->last_flush = 0;
 177         primary->last_wrap++;
 178
 179         head = MGA_READ(MGA_PRIMADDRESS);
 180
 181         if (head == dev_priv->primary->offset) {
 182                 primary->space = primary->size;
 183         } else {
 184                 primary->space = head - dev_priv->primary->offset;
 185         }
 186
 187         DRM_DEBUG("   head = 0x%06lx\n", head - dev_priv->primary->offset);
 188         DRM_DEBUG("   tail = 0x%06x\n", primary->tail);
 189         DRM_DEBUG("   wrap = %d\n", primary->last_wrap);
 190         DRM_DEBUG("  space = 0x%06x\n", primary->space);
 191
 192         mga_flush_write_combine();
 193         MGA_WRITE(MGA_PRIMEND, tail | MGA_PAGPXFER);
 194
 195         set_bit(0, &primary->wrapped);
 196         DRM_DEBUG("done.\n");
 197 }
 198
 199 void mga_do_dma_wrap_end(drm_mga_private_t * dev_priv)
 200 {
 201         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 202         drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
 203         u32 head = dev_priv->primary->offset;
 204         DRM_DEBUG("\n");
 205
 206         sarea_priv->last_wrap++;
 207         DRM_DEBUG("   wrap = %d\n", sarea_priv->last_wrap);
 208
 209         mga_flush_write_combine();
 210         MGA_WRITE(MGA_PRIMADDRESS, head | MGA_DMA_GENERAL);
 211
 212         clear_bit(0, &primary->wrapped);
 213         DRM_DEBUG("done.\n");
 214 }
 215
 216 /* ================================================================
 217  * Freelist management
 218  */
 219
 220 #define MGA_BUFFER_USED         ~0
 221 #define MGA_BUFFER_FREE         0
 222
 223 #if MGA_FREELIST_DEBUG
 224 static void mga_freelist_print(drm_device_t * dev)
 225 {
 226         drm_mga_private_t *dev_priv = dev->dev_private;
 227         drm_mga_freelist_t *entry;
 228
 229         DRM_INFO("\n");
 230         DRM_INFO("current dispatch: last=0x%x done=0x%x\n",
 231                  dev_priv->sarea_priv->last_dispatch,
 232                  (unsigned int)(MGA_READ(MGA_PRIMADDRESS) -
 233                                 dev_priv->primary->offset));
 234         DRM_INFO("current freelist:\n");
 235
 236         for (entry = dev_priv->head->next; entry; entry = entry->next) {
 237                 DRM_INFO("   %p   idx=%2d  age=0x%x 0x%06lx\n",
 238                          entry, entry->buf->idx, entry->age.head,
 239                          entry->age.head - dev_priv->primary->offset);
 240         }
 241         DRM_INFO("\n");
 242 }
 243 #endif
 244
 245 static int mga_freelist_init(drm_device_t * dev, drm_mga_private_t * dev_priv)
 246 {
 247         drm_device_dma_t *dma = dev->dma;
 248         drm_buf_t *buf;
 249         drm_mga_buf_priv_t *buf_priv;
 250         drm_mga_freelist_t *entry;
 251         int i;
 252         DRM_DEBUG("count=%d\n", dma->buf_count);
 253
 254         dev_priv->head = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
 255         if (dev_priv->head == NULL)
 256                 return DRM_ERR(ENOMEM);
 257
 258         memset(dev_priv->head, 0, sizeof(drm_mga_freelist_t));
 259         SET_AGE(&dev_priv->head->age, MGA_BUFFER_USED, 0);
 260
 261         for (i = 0; i < dma->buf_count; i++) {
 262                 buf = dma->buflist[i];
 263                 buf_priv = buf->dev_private;
 264
 265                 entry = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
 266                 if (entry == NULL)
 267                         return DRM_ERR(ENOMEM);
 268
 269                 memset(entry, 0, sizeof(drm_mga_freelist_t));
 270
 271                 entry->next = dev_priv->head->next;
 272                 entry->prev = dev_priv->head;
 273                 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
 274                 entry->buf = buf;
 275
 276                 if (dev_priv->head->next != NULL)
 277                         dev_priv->head->next->prev = entry;
 278                 if (entry->next == NULL)
 279                         dev_priv->tail = entry;
 280
 281                 buf_priv->list_entry = entry;
 282                 buf_priv->discard = 0;
 283                 buf_priv->dispatched = 0;
 284
 285                 dev_priv->head->next = entry;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static void mga_freelist_cleanup(drm_device_t * dev)
 292 {
 293         drm_mga_private_t *dev_priv = dev->dev_private;
 294         drm_mga_freelist_t *entry;
 295         drm_mga_freelist_t *next;
 296         DRM_DEBUG("\n");
 297
 298         entry = dev_priv->head;
 299         while (entry) {
 300                 next = entry->next;
 301                 drm_free(entry, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
 302                 entry = next;
 303         }
 304
 305         dev_priv->head = dev_priv->tail = NULL;
 306 }
 307
 308 #if 0
 309 /* FIXME: Still needed?
 310  */
 311 static void mga_freelist_reset(drm_device_t * dev)
 312 {
 313         drm_device_dma_t *dma = dev->dma;
 314         drm_buf_t *buf;
 315         drm_mga_buf_priv_t *buf_priv;
 316         int i;
 317
 318         for (i = 0; i < dma->buf_count; i++) {
 319                 buf = dma->buflist[i];
 320                 buf_priv = buf->dev_private;
 321                 SET_AGE(&buf_priv->list_entry->age, MGA_BUFFER_FREE, 0);
 322         }
 323 }
 324 #endif
 325
 326 static drm_buf_t *mga_freelist_get(drm_device_t * dev)
 327 {
 328         drm_mga_private_t *dev_priv = dev->dev_private;
 329         drm_mga_freelist_t *next;
 330         drm_mga_freelist_t *prev;
 331         drm_mga_freelist_t *tail = dev_priv->tail;
 332         u32 head, wrap;
 333         DRM_DEBUG("\n");
 334
 335         head = MGA_READ(MGA_PRIMADDRESS);
 336         wrap = dev_priv->sarea_priv->last_wrap;
 337
 338         DRM_DEBUG("   tail=0x%06lx %d\n",
 339                   tail->age.head ?
 340                   tail->age.head - dev_priv->primary->offset : 0,
 341                   tail->age.wrap);
 342         DRM_DEBUG("   head=0x%06lx %d\n",
 343                   head - dev_priv->primary->offset, wrap);
 344
 345         if (TEST_AGE(&tail->age, head, wrap)) {
 346                 prev = dev_priv->tail->prev;
 347                 next = dev_priv->tail;
 348                 prev->next = NULL;
 349                 next->prev = next->next = NULL;
 350                 dev_priv->tail = prev;
 351                 SET_AGE(&next->age, MGA_BUFFER_USED, 0);
 352                 return next->buf;
 353         }
 354
 355         DRM_DEBUG("returning NULL!\n");
 356         return NULL;
 357 }
 358
 359 int mga_freelist_put(drm_device_t * dev, drm_buf_t * buf)
 360 {
 361         drm_mga_private_t *dev_priv = dev->dev_private;
 362         drm_mga_buf_priv_t *buf_priv = buf->dev_private;
 363         drm_mga_freelist_t *head, *entry, *prev;
 364
 365         DRM_DEBUG("age=0x%06lx wrap=%d\n",
 366                   buf_priv->list_entry->age.head -
 367                   dev_priv->primary->offset, buf_priv->list_entry->age.wrap);
 368
 369         entry = buf_priv->list_entry;
 370         head = dev_priv->head;
 371
 372         if (buf_priv->list_entry->age.head == MGA_BUFFER_USED) {
 373                 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
 374                 prev = dev_priv->tail;
 375                 prev->next = entry;
 376                 entry->prev = prev;
 377                 entry->next = NULL;
 378         } else {
 379                 prev = head->next;
 380                 head->next = entry;
 381                 prev->prev = entry;
 382                 entry->prev = head;
 383                 entry->next = prev;
 384         }
 385
 386         return 0;
 387 }
 388
 389 /* ================================================================
 390  * DMA initialization, cleanup
 391  */
 392
 393 static int mga_do_init_dma(drm_device_t * dev, drm_mga_init_t * init)
 394 {
 395         drm_mga_private_t *dev_priv;
 396         int ret;
 397         DRM_DEBUG("\n");
 398
 399         dev_priv = drm_alloc(sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
 400         if (!dev_priv)
 401                 return DRM_ERR(ENOMEM);
 402
 403         memset(dev_priv, 0, sizeof(drm_mga_private_t));
 404
 405         dev_priv->chipset = init->chipset;
 406
 407         dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
 408
 409         if (init->sgram) {
 410                 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
 411         } else {
 412                 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
 413         }
 414         dev_priv->maccess = init->maccess;
 415
 416         dev_priv->fb_cpp = init->fb_cpp;
 417         dev_priv->front_offset = init->front_offset;
 418         dev_priv->front_pitch = init->front_pitch;
 419         dev_priv->back_offset = init->back_offset;
 420         dev_priv->back_pitch = init->back_pitch;
 421
 422         dev_priv->depth_cpp = init->depth_cpp;
 423         dev_priv->depth_offset = init->depth_offset;
 424         dev_priv->depth_pitch = init->depth_pitch;
 425
 426         /* FIXME: Need to support AGP textures...
 427          */
 428         dev_priv->texture_offset = init->texture_offset[0];
 429         dev_priv->texture_size = init->texture_size[0];
 430
 431         DRM_GETSAREA();
 432
 433         if (!dev_priv->sarea) {
 434                 DRM_ERROR("failed to find sarea!\n");
 435                 /* Assign dev_private so we can do cleanup. */
 436                 dev->dev_private = (void *)dev_priv;
 437                 mga_do_cleanup_dma(dev);
 438                 return DRM_ERR(EINVAL);
 439         }
 440
 441         dev_priv->mmio = drm_core_findmap(dev, init->mmio_offset);
 442         if (!dev_priv->mmio) {
 443                 DRM_ERROR("failed to find mmio region!\n");
 444                 /* Assign dev_private so we can do cleanup. */
 445                 dev->dev_private = (void *)dev_priv;
 446                 mga_do_cleanup_dma(dev);
 447                 return DRM_ERR(EINVAL);
 448         }
 449         dev_priv->status = drm_core_findmap(dev, init->status_offset);
 450         if (!dev_priv->status) {
 451                 DRM_ERROR("failed to find status page!\n");
 452                 /* Assign dev_private so we can do cleanup. */
 453                 dev->dev_private = (void *)dev_priv;
 454                 mga_do_cleanup_dma(dev);
 455                 return DRM_ERR(EINVAL);
 456         }
 457         dev_priv->warp = drm_core_findmap(dev, init->warp_offset);
 458         if (!dev_priv->warp) {
 459                 DRM_ERROR("failed to find warp microcode region!\n");
 460                 /* Assign dev_private so we can do cleanup. */
 461                 dev->dev_private = (void *)dev_priv;
 462                 mga_do_cleanup_dma(dev);
 463                 return DRM_ERR(EINVAL);
 464         }
 465         dev_priv->primary = drm_core_findmap(dev, init->primary_offset);
 466         if (!dev_priv->primary) {
 467                 DRM_ERROR("failed to find primary dma region!\n");
 468                 /* Assign dev_private so we can do cleanup. */
 469                 dev->dev_private = (void *)dev_priv;
 470                 mga_do_cleanup_dma(dev);
 471                 return DRM_ERR(EINVAL);
 472         }
 473         dev->agp_buffer_map = drm_core_findmap(dev, init->buffers_offset);
 474         if (!dev->agp_buffer_map) {
 475                 DRM_ERROR("failed to find dma buffer region!\n");
 476                 /* Assign dev_private so we can do cleanup. */
 477                 dev->dev_private = (void *)dev_priv;
 478                 mga_do_cleanup_dma(dev);
 479                 return DRM_ERR(EINVAL);
 480         }
 481
 482         dev_priv->sarea_priv =
 483             (drm_mga_sarea_t *) ((u8 *) dev_priv->sarea->handle +
 484                                  init->sarea_priv_offset);
 485
 486         drm_core_ioremap(dev_priv->warp, dev);
 487         drm_core_ioremap(dev_priv->primary, dev);
 488         drm_core_ioremap(dev->agp_buffer_map, dev);
 489
 490         if (!dev_priv->warp->handle ||
 491             !dev_priv->primary->handle || !dev->agp_buffer_map->handle) {
 492                 DRM_ERROR("failed to ioremap agp regions!\n");
 493                 /* Assign dev_private so we can do cleanup. */
 494                 dev->dev_private = (void *)dev_priv;
 495                 mga_do_cleanup_dma(dev);
 496                 return DRM_ERR(ENOMEM);
 497         }
 498
 499         ret = mga_warp_install_microcode(dev_priv);
 500         if (ret < 0) {
 501                 DRM_ERROR("failed to install WARP ucode!\n");
 502                 /* Assign dev_private so we can do cleanup. */
 503                 dev->dev_private = (void *)dev_priv;
 504                 mga_do_cleanup_dma(dev);
 505                 return ret;
 506         }
 507
 508         ret = mga_warp_init(dev_priv);
 509         if (ret < 0) {
 510                 DRM_ERROR("failed to init WARP engine!\n");
 511                 /* Assign dev_private so we can do cleanup. */
 512                 dev->dev_private = (void *)dev_priv;
 513                 mga_do_cleanup_dma(dev);
 514                 return ret;
 515         }
 516
 517         dev_priv->prim.status = (u32 *) dev_priv->status->handle;
 518
 519         mga_do_wait_for_idle(dev_priv);
 520
 521         /* Init the primary DMA registers.
 522          */
 523         MGA_WRITE(MGA_PRIMADDRESS, dev_priv->primary->offset | MGA_DMA_GENERAL);
 524 #if 0
 525         MGA_WRITE(MGA_PRIMPTR, virt_to_bus((void *)dev_priv->prim.status) | MGA_PRIMPTREN0 |    /* Soft trap, SECEND, SETUPEND */
 526                   MGA_PRIMPTREN1);      /* DWGSYNC */
 527 #endif
 528
 529         dev_priv->prim.start = (u8 *) dev_priv->primary->handle;
 530         dev_priv->prim.end = ((u8 *) dev_priv->primary->handle
 531                               + dev_priv->primary->size);
 532         dev_priv->prim.size = dev_priv->primary->size;
 533
 534         dev_priv->prim.tail = 0;
 535         dev_priv->prim.space = dev_priv->prim.size;
 536         dev_priv->prim.wrapped = 0;
 537
 538         dev_priv->prim.last_flush = 0;
 539         dev_priv->prim.last_wrap = 0;
 540
 541         dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
 542
 543         dev_priv->prim.status[0] = dev_priv->primary->offset;
 544         dev_priv->prim.status[1] = 0;
 545
 546         dev_priv->sarea_priv->last_wrap = 0;
 547         dev_priv->sarea_priv->last_frame.head = 0;
 548         dev_priv->sarea_priv->last_frame.wrap = 0;
 549
 550         if (mga_freelist_init(dev, dev_priv) < 0) {
 551                 DRM_ERROR("could not initialize freelist\n");
 552                 /* Assign dev_private so we can do cleanup. */
 553                 dev->dev_private = (void *)dev_priv;
 554                 mga_do_cleanup_dma(dev);
 555                 return DRM_ERR(ENOMEM);
 556         }
 557
 558         /* Make dev_private visable to others. */
 559         dev->dev_private = (void *)dev_priv;
 560         return 0;
 561 }
 562
 563 static int mga_do_cleanup_dma(drm_device_t * dev)
 564 {
 565         DRM_DEBUG("\n");
 566
 567         /* Make sure interrupts are disabled here because the uninstall ioctl
 568          * may not have been called from userspace and after dev_private
 569          * is freed, it's too late.
 570          */
 571         if (dev->irq_enabled)
 572                 drm_irq_uninstall(dev);
 573
 574         if (dev->dev_private) {
 575                 drm_mga_private_t *dev_priv = dev->dev_private;
 576
 577                 if (dev_priv->warp != NULL)
 578                         drm_core_ioremapfree(dev_priv->warp, dev);
 579                 if (dev_priv->primary != NULL)
 580                         drm_core_ioremapfree(dev_priv->primary, dev);
 581                 if (dev->agp_buffer_map != NULL) {
 582                         drm_core_ioremapfree(dev->agp_buffer_map, dev);
 583                         dev->agp_buffer_map = NULL;
 584                 }
 585
 586                 if (dev_priv->head != NULL) {
 587                         mga_freelist_cleanup(dev);
 588                 }
 589
 590                 drm_free(dev->dev_private, sizeof(drm_mga_private_t),
 591                          DRM_MEM_DRIVER);
 592                 dev->dev_private = NULL;
 593         }
 594
 595         return 0;
 596 }
 597
 598 int mga_dma_init(DRM_IOCTL_ARGS)
 599 {
 600         DRM_DEVICE;
 601         drm_mga_init_t init;
 602
 603         LOCK_TEST_WITH_RETURN(dev, filp);
 604
 605         DRM_COPY_FROM_USER_IOCTL(init, (drm_mga_init_t __user *) data,
 606                                  sizeof(init));
 607
 608         switch (init.func) {
 609         case MGA_INIT_DMA:
 610                 return mga_do_init_dma(dev, &init);
 611         case MGA_CLEANUP_DMA:
 612                 return mga_do_cleanup_dma(dev);
 613         }
 614
 615         return DRM_ERR(EINVAL);
 616 }
 617
 618 /* ================================================================
 619  * Primary DMA stream management
 620  */
 621
 622 int mga_dma_flush(DRM_IOCTL_ARGS)
 623 {
 624         DRM_DEVICE;
 625         drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
 626         drm_lock_t lock;
 627
 628         LOCK_TEST_WITH_RETURN(dev, filp);
 629
 630         DRM_COPY_FROM_USER_IOCTL(lock, (drm_lock_t __user *) data,
 631                                  sizeof(lock));
 632
 633         DRM_DEBUG("%s%s%s\n",
 634                   (lock.flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
 635                   (lock.flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
 636                   (lock.flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "");
 637
 638         WRAP_WAIT_WITH_RETURN(dev_priv);
 639
 640         if (lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL)) {
 641                 mga_do_dma_flush(dev_priv);
 642         }
 643
 644         if (lock.flags & _DRM_LOCK_QUIESCENT) {
 645 #if MGA_DMA_DEBUG
 646                 int ret = mga_do_wait_for_idle(dev_priv);
 647                 if (ret < 0)
 648                         DRM_INFO("%s: -EBUSY\n", __FUNCTION__);
 649                 return ret;
 650 #else
 651                 return mga_do_wait_for_idle(dev_priv);
 652 #endif
 653         } else {
 654                 return 0;
 655         }
 656 }
 657
 658 int mga_dma_reset(DRM_IOCTL_ARGS)
 659 {
 660         DRM_DEVICE;
 661         drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
 662
 663         LOCK_TEST_WITH_RETURN(dev, filp);
 664
 665         return mga_do_dma_reset(dev_priv);
 666 }
 667
 668 /* ================================================================
 669  * DMA buffer management
 670  */
 671
 672 static int mga_dma_get_buffers(DRMFILE filp, drm_device_t * dev, drm_dma_t * d)
 673 {
 674         drm_buf_t *buf;
 675         int i;
 676
 677         for (i = d->granted_count; i < d->request_count; i++) {
 678                 buf = mga_freelist_get(dev);
 679                 if (!buf)
 680                         return DRM_ERR(EAGAIN);
 681
 682                 buf->filp = filp;
 683
 684                 if (DRM_COPY_TO_USER(&d->request_indices[i],
 685                                      &buf->idx, sizeof(buf->idx)))
 686                         return DRM_ERR(EFAULT);
 687                 if (DRM_COPY_TO_USER(&d->request_sizes[i],
 688                                      &buf->total, sizeof(buf->total)))
 689                         return DRM_ERR(EFAULT);
 690
 691                 d->granted_count++;
 692         }
 693         return 0;
 694 }
 695
 696 int mga_dma_buffers(DRM_IOCTL_ARGS)
 697 {
 698         DRM_DEVICE;
 699         drm_device_dma_t *dma = dev->dma;
 700         drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
 701         drm_dma_t __user *argp = (void __user *)data;
 702         drm_dma_t d;
 703         int ret = 0;
 704
 705         LOCK_TEST_WITH_RETURN(dev, filp);
 706
 707         DRM_COPY_FROM_USER_IOCTL(d, argp, sizeof(d));
 708
 709         /* Please don't send us buffers.
 710          */
 711         if (d.send_count != 0) {
 712                 DRM_ERROR("Process %d trying to send %d buffers via drmDMA\n",
 713                           DRM_CURRENTPID, d.send_count);
 714                 return DRM_ERR(EINVAL);
 715         }
 716
 717         /* We'll send you buffers.
 718          */
 719         if (d.request_count < 0 || d.request_count > dma->buf_count) {
 720                 DRM_ERROR("Process %d trying to get %d buffers (of %d max)\n",
 721                           DRM_CURRENTPID, d.request_count, dma->buf_count);
 722                 return DRM_ERR(EINVAL);
 723         }
 724
 725         WRAP_TEST_WITH_RETURN(dev_priv);
 726
 727         d.granted_count = 0;
 728
 729         if (d.request_count) {
 730                 ret = mga_dma_get_buffers(filp, dev, &d);
 731         }
 732
 733         DRM_COPY_TO_USER_IOCTL(argp, d, sizeof(d));
 734
 735         return ret;
 736 }
 737
 738 void mga_driver_pretakedown(drm_device_t * dev)
 739 {
 740         mga_do_cleanup_dma(dev);
 741 }
 742
 743 int mga_driver_dma_quiescent(drm_device_t * dev)
 744 {
 745         drm_mga_private_t *dev_priv = dev->dev_private;
 746         return mga_do_wait_for_idle(dev_priv);
 747 }