drivers/gpu/drm/mga/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
  28 /**
  29  * \file mga_dma.c
  30  * DMA support for MGA G200 / G400.
  31  *
  32  * \author Rickard E. (Rik) Faith <faith@valinux.com>
  33  * \author Jeff Hartmann <jhartmann@valinux.com>
  34  * \author Keith Whitwell <keith@tungstengraphics.com>
  35  * \author Gareth Hughes <gareth@valinux.com>
  36  */
  37
  38 #include "drmP.h"
  39 #include "drm.h"
  40 #include "drm_sarea.h"
  41 #include "mga_drm.h"
  42 #include "mga_drv.h"
  43
  44 #define MGA_DEFAULT_USEC_TIMEOUT        10000
  45 #define MGA_FREELIST_DEBUG              0
  46
  47 #define MINIMAL_CLEANUP 0
  48 #define FULL_CLEANUP 1
  49 static int mga_do_cleanup_dma(struct drm_device *dev, int full_cleanup);
  50
  51 /* ================================================================
  52  * Engine control
  53  */
  54
  55 int mga_do_wait_for_idle(drm_mga_private_t * dev_priv)
  56 {
  57         u32 status = 0;
  58         int i;
  59         DRM_DEBUG("\n");
  60
  61         for (i = 0; i < dev_priv->usec_timeout; i++) {
  62                 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
  63                 if (status == MGA_ENDPRDMASTS) {
  64                         MGA_WRITE8(MGA_CRTC_INDEX, 0);
  65                         return 0;
  66                 }
  67                 DRM_UDELAY(1);
  68         }
  69
  70 #if MGA_DMA_DEBUG
  71         DRM_ERROR("failed!\n");
  72         DRM_INFO("   status=0x%08x\n", status);
  73 #endif
  74         return -EBUSY;
  75 }
  76
  77 static int mga_do_dma_reset(drm_mga_private_t * dev_priv)
  78 {
  79         drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
  80         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
  81
  82         DRM_DEBUG("\n");
  83
  84         /* The primary DMA stream should look like new right about now.
  85          */
  86         primary->tail = 0;
  87         primary->space = primary->size;
  88         primary->last_flush = 0;
  89
  90         sarea_priv->last_wrap = 0;
  91
  92         /* FIXME: Reset counters, buffer ages etc...
  93          */
  94
  95         /* FIXME: What else do we need to reinitialize?  WARP stuff?
  96          */
  97
  98         return 0;
  99 }
 100
 101 /* ================================================================
 102  * Primary DMA stream
 103  */
 104
 105 void mga_do_dma_flush(drm_mga_private_t * dev_priv)
 106 {
 107         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 108         u32 head, tail;
 109         u32 status = 0;
 110         int i;
 111         DMA_LOCALS;
 112         DRM_DEBUG("\n");
 113
 114         /* We need to wait so that we can do an safe flush */
 115         for (i = 0; i < dev_priv->usec_timeout; i++) {
 116                 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
 117                 if (status == MGA_ENDPRDMASTS)
 118                         break;
 119                 DRM_UDELAY(1);
 120         }
 121
 122         if (primary->tail == primary->last_flush) {
 123                 DRM_DEBUG("   bailing out...\n");
 124                 return;
 125         }
 126
 127         tail = primary->tail + dev_priv->primary->offset;
 128
 129         /* We need to pad the stream between flushes, as the card
 130          * actually (partially?) reads the first of these commands.
 131          * See page 4-16 in the G400 manual, middle of the page or so.
 132          */
 133         BEGIN_DMA(1);
 134
 135         DMA_BLOCK(MGA_DMAPAD, 0x00000000,
 136                   MGA_DMAPAD, 0x00000000,
 137                   MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
 138
 139         ADVANCE_DMA();
 140
 141         primary->last_flush = primary->tail;
 142
 143         head = MGA_READ(MGA_PRIMADDRESS);
 144
 145         if (head <= tail) {
 146                 primary->space = primary->size - primary->tail;
 147         } else {
 148                 primary->space = head - tail;
 149         }
 150
 151         DRM_DEBUG("   head = 0x%06lx\n", (unsigned long)(head - dev_priv->primary->offset));
 152         DRM_DEBUG("   tail = 0x%06lx\n", (unsigned long)(tail - dev_priv->primary->offset));
 153         DRM_DEBUG("  space = 0x%06x\n", primary->space);
 154
 155         mga_flush_write_combine();
 156         MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);
 157
 158         DRM_DEBUG("done.\n");
 159 }
 160
 161 void mga_do_dma_wrap_start(drm_mga_private_t * dev_priv)
 162 {
 163         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 164         u32 head, tail;
 165         DMA_LOCALS;
 166         DRM_DEBUG("\n");
 167
 168         BEGIN_DMA_WRAP();
 169
 170         DMA_BLOCK(MGA_DMAPAD, 0x00000000,
 171                   MGA_DMAPAD, 0x00000000,
 172                   MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
 173
 174         ADVANCE_DMA();
 175
 176         tail = primary->tail + dev_priv->primary->offset;
 177
 178         primary->tail = 0;
 179         primary->last_flush = 0;
 180         primary->last_wrap++;
 181
 182         head = MGA_READ(MGA_PRIMADDRESS);
 183
 184         if (head == dev_priv->primary->offset) {
 185                 primary->space = primary->size;
 186         } else {
 187                 primary->space = head - dev_priv->primary->offset;
 188         }
 189
 190         DRM_DEBUG("   head = 0x%06lx\n", (unsigned long)(head - dev_priv->primary->offset));
 191         DRM_DEBUG("   tail = 0x%06x\n", primary->tail);
 192         DRM_DEBUG("   wrap = %d\n", primary->last_wrap);
 193         DRM_DEBUG("  space = 0x%06x\n", primary->space);
 194
 195         mga_flush_write_combine();
 196         MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);
 197
 198         set_bit(0, &primary->wrapped);
 199         DRM_DEBUG("done.\n");
 200 }
 201
 202 void mga_do_dma_wrap_end(drm_mga_private_t * dev_priv)
 203 {
 204         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 205         drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
 206         u32 head = dev_priv->primary->offset;
 207         DRM_DEBUG("\n");
 208
 209         sarea_priv->last_wrap++;
 210         DRM_DEBUG("   wrap = %d\n", sarea_priv->last_wrap);
 211
 212         mga_flush_write_combine();
 213         MGA_WRITE(MGA_PRIMADDRESS, head | MGA_DMA_GENERAL);
 214
 215         clear_bit(0, &primary->wrapped);
 216         DRM_DEBUG("done.\n");
 217 }
 218
 219 /* ================================================================
 220  * Freelist management
 221  */
 222
 223 #define MGA_BUFFER_USED         ~0
 224 #define MGA_BUFFER_FREE         0
 225
 226 #if MGA_FREELIST_DEBUG
 227 static void mga_freelist_print(struct drm_device * dev)
 228 {
 229         drm_mga_private_t *dev_priv = dev->dev_private;
 230         drm_mga_freelist_t *entry;
 231
 232         DRM_INFO("\n");
 233         DRM_INFO("current dispatch: last=0x%x done=0x%x\n",
 234                  dev_priv->sarea_priv->last_dispatch,
 235                  (unsigned int)(MGA_READ(MGA_PRIMADDRESS) -
 236                                 dev_priv->primary->offset));
 237         DRM_INFO("current freelist:\n");
 238
 239         for (entry = dev_priv->head->next; entry; entry = entry->next) {
 240                 DRM_INFO("   %p   idx=%2d  age=0x%x 0x%06lx\n",
 241                          entry, entry->buf->idx, entry->age.head,
 242                          (unsigned long)(entry->age.head - dev_priv->primary->offset));
 243         }
 244         DRM_INFO("\n");
 245 }
 246 #endif
 247
 248 static int mga_freelist_init(struct drm_device * dev, drm_mga_private_t * dev_priv)
 249 {
 250         struct drm_device_dma *dma = dev->dma;
 251         struct drm_buf *buf;
 252         drm_mga_buf_priv_t *buf_priv;
 253         drm_mga_freelist_t *entry;
 254         int i;
 255         DRM_DEBUG("count=%d\n", dma->buf_count);
 256
 257         dev_priv->head = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
 258         if (dev_priv->head == NULL)
 259                 return -ENOMEM;
 260
 261         memset(dev_priv->head, 0, sizeof(drm_mga_freelist_t));
 262         SET_AGE(&dev_priv->head->age, MGA_BUFFER_USED, 0);
 263
 264         for (i = 0; i < dma->buf_count; i++) {
 265                 buf = dma->buflist[i];
 266                 buf_priv = buf->dev_private;
 267
 268                 entry = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
 269                 if (entry == NULL)
 270                         return -ENOMEM;
 271
 272                 memset(entry, 0, sizeof(drm_mga_freelist_t));
 273
 274                 entry->next = dev_priv->head->next;
 275                 entry->prev = dev_priv->head;
 276                 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
 277                 entry->buf = buf;
 278
 279                 if (dev_priv->head->next != NULL)
 280                         dev_priv->head->next->prev = entry;
 281                 if (entry->next == NULL)
 282                         dev_priv->tail = entry;
 283
 284                 buf_priv->list_entry = entry;
 285                 buf_priv->discard = 0;
 286                 buf_priv->dispatched = 0;
 287
 288                 dev_priv->head->next = entry;
 289         }
 290
 291         return 0;
 292 }
 293
 294 static void mga_freelist_cleanup(struct drm_device * dev)
 295 {
 296         drm_mga_private_t *dev_priv = dev->dev_private;
 297         drm_mga_freelist_t *entry;
 298         drm_mga_freelist_t *next;
 299         DRM_DEBUG("\n");
 300
 301         entry = dev_priv->head;
 302         while (entry) {
 303                 next = entry->next;
 304                 drm_free(entry, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
 305                 entry = next;
 306         }
 307
 308         dev_priv->head = dev_priv->tail = NULL;
 309 }
 310
 311 #if 0
 312 /* FIXME: Still needed?
 313  */
 314 static void mga_freelist_reset(struct drm_device * dev)
 315 {
 316         struct drm_device_dma *dma = dev->dma;
 317         struct drm_buf *buf;
 318         drm_mga_buf_priv_t *buf_priv;
 319         int i;
 320
 321         for (i = 0; i < dma->buf_count; i++) {
 322                 buf = dma->buflist[i];
 323                 buf_priv = buf->dev_private;
 324                 SET_AGE(&buf_priv->list_entry->age, MGA_BUFFER_FREE, 0);
 325         }
 326 }
 327 #endif
 328
 329 static struct drm_buf *mga_freelist_get(struct drm_device * dev)
 330 {
 331         drm_mga_private_t *dev_priv = dev->dev_private;
 332         drm_mga_freelist_t *next;
 333         drm_mga_freelist_t *prev;
 334         drm_mga_freelist_t *tail = dev_priv->tail;
 335         u32 head, wrap;
 336         DRM_DEBUG("\n");
 337
 338         head = MGA_READ(MGA_PRIMADDRESS);
 339         wrap = dev_priv->sarea_priv->last_wrap;
 340
 341         DRM_DEBUG("   tail=0x%06lx %d\n",
 342                   tail->age.head ?
 343                   (unsigned long)(tail->age.head - dev_priv->primary->offset) : 0,
 344                   tail->age.wrap);
 345         DRM_DEBUG("   head=0x%06lx %d\n",
 346                   (unsigned long)(head - dev_priv->primary->offset), wrap);
 347
 348         if (TEST_AGE(&tail->age, head, wrap)) {
 349                 prev = dev_priv->tail->prev;
 350                 next = dev_priv->tail;
 351                 prev->next = NULL;
 352                 next->prev = next->next = NULL;
 353                 dev_priv->tail = prev;
 354                 SET_AGE(&next->age, MGA_BUFFER_USED, 0);
 355                 return next->buf;
 356         }
 357
 358         DRM_DEBUG("returning NULL!\n");
 359         return NULL;
 360 }
 361
 362 int mga_freelist_put(struct drm_device * dev, struct drm_buf * buf)
 363 {
 364         drm_mga_private_t *dev_priv = dev->dev_private;
 365         drm_mga_buf_priv_t *buf_priv = buf->dev_private;
 366         drm_mga_freelist_t *head, *entry, *prev;
 367
 368         DRM_DEBUG("age=0x%06lx wrap=%d\n",
 369                   (unsigned long)(buf_priv->list_entry->age.head -
 370                                   dev_priv->primary->offset),
 371                   buf_priv->list_entry->age.wrap);
 372
 373         entry = buf_priv->list_entry;
 374         head = dev_priv->head;
 375
 376         if (buf_priv->list_entry->age.head == MGA_BUFFER_USED) {
 377                 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
 378                 prev = dev_priv->tail;
 379                 prev->next = entry;
 380                 entry->prev = prev;
 381                 entry->next = NULL;
 382         } else {
 383                 prev = head->next;
 384                 head->next = entry;
 385                 prev->prev = entry;
 386                 entry->prev = head;
 387                 entry->next = prev;
 388         }
 389
 390         return 0;
 391 }
 392
 393 /* ================================================================
 394  * DMA initialization, cleanup
 395  */
 396
 397 int mga_driver_load(struct drm_device * dev, unsigned long flags)
 398 {
 399         drm_mga_private_t *dev_priv;
 400         int ret;
 401
 402         dev_priv = drm_alloc(sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
 403         if (!dev_priv)
 404                 return -ENOMEM;
 405
 406         dev->dev_private = (void *)dev_priv;
 407         memset(dev_priv, 0, sizeof(drm_mga_private_t));
 408
 409         dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
 410         dev_priv->chipset = flags;
 411
 412         dev_priv->mmio_base = drm_get_resource_start(dev, 1);
 413         dev_priv->mmio_size = drm_get_resource_len(dev, 1);
 414
 415         dev->counters += 3;
 416         dev->types[6] = _DRM_STAT_IRQ;
 417         dev->types[7] = _DRM_STAT_PRIMARY;
 418         dev->types[8] = _DRM_STAT_SECONDARY;
 419
 420         ret = drm_vblank_init(dev, 1);
 421
 422         if (ret) {
 423                 (void) mga_driver_unload(dev);
 424                 return ret;
 425         }
 426
 427         return 0;
 428 }
 429
 430 #if __OS_HAS_AGP
 431 /**
 432  * Bootstrap the driver for AGP DMA.
 433  *
 434  * \todo
 435  * Investigate whether there is any benifit to storing the WARP microcode in
 436  * AGP memory.  If not, the microcode may as well always be put in PCI
 437  * memory.
 438  *
 439  * \todo
 440  * This routine needs to set dma_bs->agp_mode to the mode actually configured
 441  * in the hardware.  Looking just at the Linux AGP driver code, I don't see
 442  * an easy way to determine this.
 443  *
 444  * \sa mga_do_dma_bootstrap, mga_do_pci_dma_bootstrap
 445  */
 446 static int mga_do_agp_dma_bootstrap(struct drm_device * dev,
 447                                     drm_mga_dma_bootstrap_t * dma_bs)
 448 {
 449         drm_mga_private_t *const dev_priv =
 450             (drm_mga_private_t *) dev->dev_private;
 451         unsigned int warp_size = mga_warp_microcode_size(dev_priv);
 452         int err;
 453         unsigned offset;
 454         const unsigned secondary_size = dma_bs->secondary_bin_count
 455             * dma_bs->secondary_bin_size;
 456         const unsigned agp_size = (dma_bs->agp_size << 20);
 457         struct drm_buf_desc req;
 458         struct drm_agp_mode mode;
 459         struct drm_agp_info info;
 460         struct drm_agp_buffer agp_req;
 461         struct drm_agp_binding bind_req;
 462
 463         /* Acquire AGP. */
 464         err = drm_agp_acquire(dev);
 465         if (err) {
 466                 DRM_ERROR("Unable to acquire AGP: %d\n", err);
 467                 return err;
 468         }
 469
 470         err = drm_agp_info(dev, &info);
 471         if (err) {
 472                 DRM_ERROR("Unable to get AGP info: %d\n", err);
 473                 return err;
 474         }
 475
 476         mode.mode = (info.mode & ~0x07) | dma_bs->agp_mode;
 477         err = drm_agp_enable(dev, mode);
 478         if (err) {
 479                 DRM_ERROR("Unable to enable AGP (mode = 0x%lx)\n", mode.mode);
 480                 return err;
 481         }
 482
 483         /* In addition to the usual AGP mode configuration, the G200 AGP cards
 484          * need to have the AGP mode "manually" set.
 485          */
 486
 487         if (dev_priv->chipset == MGA_CARD_TYPE_G200) {
 488                 if (mode.mode & 0x02) {
 489                         MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_ENABLE);
 490                 } else {
 491                         MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_DISABLE);
 492                 }
 493         }
 494
 495         /* Allocate and bind AGP memory. */
 496         agp_req.size = agp_size;
 497         agp_req.type = 0;
 498         err = drm_agp_alloc(dev, &agp_req);
 499         if (err) {
 500                 dev_priv->agp_size = 0;
 501                 DRM_ERROR("Unable to allocate %uMB AGP memory\n",
 502                           dma_bs->agp_size);
 503                 return err;
 504         }
 505
 506         dev_priv->agp_size = agp_size;
 507         dev_priv->agp_handle = agp_req.handle;
 508
 509         bind_req.handle = agp_req.handle;
 510         bind_req.offset = 0;
 511         err = drm_agp_bind(dev, &bind_req);
 512         if (err) {
 513                 DRM_ERROR("Unable to bind AGP memory: %d\n", err);
 514                 return err;
 515         }
 516
 517         /* Make drm_addbufs happy by not trying to create a mapping for less
 518          * than a page.
 519          */
 520         if (warp_size < PAGE_SIZE)
 521                 warp_size = PAGE_SIZE;
 522
 523         offset = 0;
 524         err = drm_addmap(dev, offset, warp_size,
 525                          _DRM_AGP, _DRM_READ_ONLY, &dev_priv->warp);
 526         if (err) {
 527                 DRM_ERROR("Unable to map WARP microcode: %d\n", err);
 528                 return err;
 529         }
 530
 531         offset += warp_size;
 532         err = drm_addmap(dev, offset, dma_bs->primary_size,
 533                          _DRM_AGP, _DRM_READ_ONLY, &dev_priv->primary);
 534         if (err) {
 535                 DRM_ERROR("Unable to map primary DMA region: %d\n", err);
 536                 return err;
 537         }
 538
 539         offset += dma_bs->primary_size;
 540         err = drm_addmap(dev, offset, secondary_size,
 541                          _DRM_AGP, 0, &dev->agp_buffer_map);
 542         if (err) {
 543                 DRM_ERROR("Unable to map secondary DMA region: %d\n", err);
 544                 return err;
 545         }
 546
 547         (void)memset(&req, 0, sizeof(req));
 548         req.count = dma_bs->secondary_bin_count;
 549         req.size = dma_bs->secondary_bin_size;
 550         req.flags = _DRM_AGP_BUFFER;
 551         req.agp_start = offset;
 552
 553         err = drm_addbufs_agp(dev, &req);
 554         if (err) {
 555                 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
 556                 return err;
 557         }
 558
 559         {
 560                 struct drm_map_list *_entry;
 561                 unsigned long agp_token = 0;
 562
 563                 list_for_each_entry(_entry, &dev->maplist, head) {
 564                         if (_entry->map == dev->agp_buffer_map)
 565                                 agp_token = _entry->user_token;
 566                 }
 567                 if (!agp_token)
 568                         return -EFAULT;
 569
 570                 dev->agp_buffer_token = agp_token;
 571         }
 572
 573         offset += secondary_size;
 574         err = drm_addmap(dev, offset, agp_size - offset,
 575                          _DRM_AGP, 0, &dev_priv->agp_textures);
 576         if (err) {
 577                 DRM_ERROR("Unable to map AGP texture region %d\n", err);
 578                 return err;
 579         }
 580
 581         drm_core_ioremap(dev_priv->warp, dev);
 582         drm_core_ioremap(dev_priv->primary, dev);
 583         drm_core_ioremap(dev->agp_buffer_map, dev);
 584
 585         if (!dev_priv->warp->handle ||
 586             !dev_priv->primary->handle || !dev->agp_buffer_map->handle) {
 587                 DRM_ERROR("failed to ioremap agp regions! (%p, %p, %p)\n",
 588                           dev_priv->warp->handle, dev_priv->primary->handle,
 589                           dev->agp_buffer_map->handle);
 590                 return -ENOMEM;
 591         }
 592
 593         dev_priv->dma_access = MGA_PAGPXFER;
 594         dev_priv->wagp_enable = MGA_WAGP_ENABLE;
 595
 596         DRM_INFO("Initialized card for AGP DMA.\n");
 597         return 0;
 598 }
 599 #else
 600 static int mga_do_agp_dma_bootstrap(struct drm_device * dev,
 601                                     drm_mga_dma_bootstrap_t * dma_bs)
 602 {
 603         return -EINVAL;
 604 }
 605 #endif
 606
 607 /**
 608  * Bootstrap the driver for PCI DMA.
 609  *
 610  * \todo
 611  * The algorithm for decreasing the size of the primary DMA buffer could be
 612  * better.  The size should be rounded up to the nearest page size, then
 613  * decrease the request size by a single page each pass through the loop.
 614  *
 615  * \todo
 616  * Determine whether the maximum address passed to drm_pci_alloc is correct.
 617  * The same goes for drm_addbufs_pci.
 618  *
 619  * \sa mga_do_dma_bootstrap, mga_do_agp_dma_bootstrap
 620  */
 621 static int mga_do_pci_dma_bootstrap(struct drm_device * dev,
 622                                     drm_mga_dma_bootstrap_t * dma_bs)
 623 {
 624         drm_mga_private_t *const dev_priv =
 625             (drm_mga_private_t *) dev->dev_private;
 626         unsigned int warp_size = mga_warp_microcode_size(dev_priv);
 627         unsigned int primary_size;
 628         unsigned int bin_count;
 629         int err;
 630         struct drm_buf_desc req;
 631
 632         if (dev->dma == NULL) {
 633                 DRM_ERROR("dev->dma is NULL\n");
 634                 return -EFAULT;
 635         }
 636
 637         /* Make drm_addbufs happy by not trying to create a mapping for less
 638          * than a page.
 639          */
 640         if (warp_size < PAGE_SIZE)
 641                 warp_size = PAGE_SIZE;
 642
 643         /* The proper alignment is 0x100 for this mapping */
 644         err = drm_addmap(dev, 0, warp_size, _DRM_CONSISTENT,
 645                          _DRM_READ_ONLY, &dev_priv->warp);
 646         if (err != 0) {
 647                 DRM_ERROR("Unable to create mapping for WARP microcode: %d\n",
 648                           err);
 649                 return err;
 650         }
 651
 652         /* Other than the bottom two bits being used to encode other
 653          * information, there don't appear to be any restrictions on the
 654          * alignment of the primary or secondary DMA buffers.
 655          */
 656
 657         for (primary_size = dma_bs->primary_size; primary_size != 0;
 658              primary_size >>= 1) {
 659                 /* The proper alignment for this mapping is 0x04 */
 660                 err = drm_addmap(dev, 0, primary_size, _DRM_CONSISTENT,
 661                                  _DRM_READ_ONLY, &dev_priv->primary);
 662                 if (!err)
 663                         break;
 664         }
 665
 666         if (err != 0) {
 667                 DRM_ERROR("Unable to allocate primary DMA region: %d\n", err);
 668                 return -ENOMEM;
 669         }
 670
 671         if (dev_priv->primary->size != dma_bs->primary_size) {
 672                 DRM_INFO("Primary DMA buffer size reduced from %u to %u.\n",
 673                          dma_bs->primary_size,
 674                          (unsigned)dev_priv->primary->size);
 675                 dma_bs->primary_size = dev_priv->primary->size;
 676         }
 677
 678         for (bin_count = dma_bs->secondary_bin_count; bin_count > 0;
 679              bin_count--) {
 680                 (void)memset(&req, 0, sizeof(req));
 681                 req.count = bin_count;
 682                 req.size = dma_bs->secondary_bin_size;
 683
 684                 err = drm_addbufs_pci(dev, &req);
 685                 if (!err) {
 686                         break;
 687                 }
 688         }
 689
 690         if (bin_count == 0) {
 691                 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
 692                 return err;
 693         }
 694
 695         if (bin_count != dma_bs->secondary_bin_count) {
 696                 DRM_INFO("Secondary PCI DMA buffer bin count reduced from %u "
 697                          "to %u.\n", dma_bs->secondary_bin_count, bin_count);
 698
 699                 dma_bs->secondary_bin_count = bin_count;
 700         }
 701
 702         dev_priv->dma_access = 0;
 703         dev_priv->wagp_enable = 0;
 704
 705         dma_bs->agp_mode = 0;
 706
 707         DRM_INFO("Initialized card for PCI DMA.\n");
 708         return 0;
 709 }
 710
 711 static int mga_do_dma_bootstrap(struct drm_device * dev,
 712                                 drm_mga_dma_bootstrap_t * dma_bs)
 713 {
 714         const int is_agp = (dma_bs->agp_mode != 0) && drm_device_is_agp(dev);
 715         int err;
 716         drm_mga_private_t *const dev_priv =
 717             (drm_mga_private_t *) dev->dev_private;
 718
 719         dev_priv->used_new_dma_init = 1;
 720
 721         /* The first steps are the same for both PCI and AGP based DMA.  Map
 722          * the cards MMIO registers and map a status page.
 723          */
 724         err = drm_addmap(dev, dev_priv->mmio_base, dev_priv->mmio_size,
 725                          _DRM_REGISTERS, _DRM_READ_ONLY, &dev_priv->mmio);
 726         if (err) {
 727                 DRM_ERROR("Unable to map MMIO region: %d\n", err);
 728                 return err;
 729         }
 730
 731         err = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
 732                          _DRM_READ_ONLY | _DRM_LOCKED | _DRM_KERNEL,
 733                          &dev_priv->status);
 734         if (err) {
 735                 DRM_ERROR("Unable to map status region: %d\n", err);
 736                 return err;
 737         }
 738
 739         /* The DMA initialization procedure is slightly different for PCI and
 740          * AGP cards.  AGP cards just allocate a large block of AGP memory and
 741          * carve off portions of it for internal uses.  The remaining memory
 742          * is returned to user-mode to be used for AGP textures.
 743          */
 744         if (is_agp) {
 745                 err = mga_do_agp_dma_bootstrap(dev, dma_bs);
 746         }
 747
 748         /* If we attempted to initialize the card for AGP DMA but failed,
 749          * clean-up any mess that may have been created.
 750          */
 751
 752         if (err) {
 753                 mga_do_cleanup_dma(dev, MINIMAL_CLEANUP);
 754         }
 755
 756         /* Not only do we want to try and initialized PCI cards for PCI DMA,
 757          * but we also try to initialized AGP cards that could not be
 758          * initialized for AGP DMA.  This covers the case where we have an AGP
 759          * card in a system with an unsupported AGP chipset.  In that case the
 760          * card will be detected as AGP, but we won't be able to allocate any
 761          * AGP memory, etc.
 762          */
 763
 764         if (!is_agp || err) {
 765                 err = mga_do_pci_dma_bootstrap(dev, dma_bs);
 766         }
 767
 768         return err;
 769 }
 770
 771 int mga_dma_bootstrap(struct drm_device *dev, void *data,
 772                       struct drm_file *file_priv)
 773 {
 774         drm_mga_dma_bootstrap_t *bootstrap = data;
 775         int err;
 776         static const int modes[] = { 0, 1, 2, 2, 4, 4, 4, 4 };
 777         const drm_mga_private_t *const dev_priv =
 778                 (drm_mga_private_t *) dev->dev_private;
 779
 780         err = mga_do_dma_bootstrap(dev, bootstrap);
 781         if (err) {
 782                 mga_do_cleanup_dma(dev, FULL_CLEANUP);
 783                 return err;
 784         }
 785
 786         if (dev_priv->agp_textures != NULL) {
 787                 bootstrap->texture_handle = dev_priv->agp_textures->offset;
 788                 bootstrap->texture_size = dev_priv->agp_textures->size;
 789         } else {
 790                 bootstrap->texture_handle = 0;
 791                 bootstrap->texture_size = 0;
 792         }
 793
 794         bootstrap->agp_mode = modes[bootstrap->agp_mode & 0x07];
 795
 796         return err;
 797 }
 798
 799 static int mga_do_init_dma(struct drm_device * dev, drm_mga_init_t * init)
 800 {
 801         drm_mga_private_t *dev_priv;
 802         int ret;
 803         DRM_DEBUG("\n");
 804
 805         dev_priv = dev->dev_private;
 806
 807         if (init->sgram) {
 808                 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
 809         } else {
 810                 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
 811         }
 812         dev_priv->maccess = init->maccess;
 813
 814         dev_priv->fb_cpp = init->fb_cpp;
 815         dev_priv->front_offset = init->front_offset;
 816         dev_priv->front_pitch = init->front_pitch;
 817         dev_priv->back_offset = init->back_offset;
 818         dev_priv->back_pitch = init->back_pitch;
 819
 820         dev_priv->depth_cpp = init->depth_cpp;
 821         dev_priv->depth_offset = init->depth_offset;
 822         dev_priv->depth_pitch = init->depth_pitch;
 823
 824         /* FIXME: Need to support AGP textures...
 825          */
 826         dev_priv->texture_offset = init->texture_offset[0];
 827         dev_priv->texture_size = init->texture_size[0];
 828
 829         dev_priv->sarea = drm_getsarea(dev);
 830         if (!dev_priv->sarea) {
 831                 DRM_ERROR("failed to find sarea!\n");
 832                 return -EINVAL;
 833         }
 834
 835         if (!dev_priv->used_new_dma_init) {
 836
 837                 dev_priv->dma_access = MGA_PAGPXFER;
 838                 dev_priv->wagp_enable = MGA_WAGP_ENABLE;
 839
 840                 dev_priv->status = drm_core_findmap(dev, init->status_offset);
 841                 if (!dev_priv->status) {
 842                         DRM_ERROR("failed to find status page!\n");
 843                         return -EINVAL;
 844                 }
 845                 dev_priv->mmio = drm_core_findmap(dev, init->mmio_offset);
 846                 if (!dev_priv->mmio) {
 847                         DRM_ERROR("failed to find mmio region!\n");
 848                         return -EINVAL;
 849                 }
 850                 dev_priv->warp = drm_core_findmap(dev, init->warp_offset);
 851                 if (!dev_priv->warp) {
 852                         DRM_ERROR("failed to find warp microcode region!\n");
 853                         return -EINVAL;
 854                 }
 855                 dev_priv->primary = drm_core_findmap(dev, init->primary_offset);
 856                 if (!dev_priv->primary) {
 857                         DRM_ERROR("failed to find primary dma region!\n");
 858                         return -EINVAL;
 859                 }
 860                 dev->agp_buffer_token = init->buffers_offset;
 861                 dev->agp_buffer_map =
 862                     drm_core_findmap(dev, init->buffers_offset);
 863                 if (!dev->agp_buffer_map) {
 864                         DRM_ERROR("failed to find dma buffer region!\n");
 865                         return -EINVAL;
 866                 }
 867
 868                 drm_core_ioremap(dev_priv->warp, dev);
 869                 drm_core_ioremap(dev_priv->primary, dev);
 870                 drm_core_ioremap(dev->agp_buffer_map, dev);
 871         }
 872
 873         dev_priv->sarea_priv =
 874             (drm_mga_sarea_t *) ((u8 *) dev_priv->sarea->handle +
 875                                  init->sarea_priv_offset);
 876
 877         if (!dev_priv->warp->handle ||
 878             !dev_priv->primary->handle ||
 879             ((dev_priv->dma_access != 0) &&
 880              ((dev->agp_buffer_map == NULL) ||
 881               (dev->agp_buffer_map->handle == NULL)))) {
 882                 DRM_ERROR("failed to ioremap agp regions!\n");
 883                 return -ENOMEM;
 884         }
 885
 886         ret = mga_warp_install_microcode(dev_priv);
 887         if (ret < 0) {
 888                 DRM_ERROR("failed to install WARP ucode!: %d\n", ret);
 889                 return ret;
 890         }
 891
 892         ret = mga_warp_init(dev_priv);
 893         if (ret < 0) {
 894                 DRM_ERROR("failed to init WARP engine!: %d\n", ret);
 895                 return ret;
 896         }
 897
 898         dev_priv->prim.status = (u32 *) dev_priv->status->handle;
 899
 900         mga_do_wait_for_idle(dev_priv);
 901
 902         /* Init the primary DMA registers.
 903          */
 904         MGA_WRITE(MGA_PRIMADDRESS, dev_priv->primary->offset | MGA_DMA_GENERAL);
 905 #if 0
 906         MGA_WRITE(MGA_PRIMPTR, virt_to_bus((void *)dev_priv->prim.status) | MGA_PRIMPTREN0 |    /* Soft trap, SECEND, SETUPEND */
 907                   MGA_PRIMPTREN1);      /* DWGSYNC */
 908 #endif
 909
 910         dev_priv->prim.start = (u8 *) dev_priv->primary->handle;
 911         dev_priv->prim.end = ((u8 *) dev_priv->primary->handle
 912                               + dev_priv->primary->size);
 913         dev_priv->prim.size = dev_priv->primary->size;
 914
 915         dev_priv->prim.tail = 0;
 916         dev_priv->prim.space = dev_priv->prim.size;
 917         dev_priv->prim.wrapped = 0;
 918
 919         dev_priv->prim.last_flush = 0;
 920         dev_priv->prim.last_wrap = 0;
 921
 922         dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
 923
 924         dev_priv->prim.status[0] = dev_priv->primary->offset;
 925         dev_priv->prim.status[1] = 0;
 926
 927         dev_priv->sarea_priv->last_wrap = 0;
 928         dev_priv->sarea_priv->last_frame.head = 0;
 929         dev_priv->sarea_priv->last_frame.wrap = 0;
 930
 931         if (mga_freelist_init(dev, dev_priv) < 0) {
 932                 DRM_ERROR("could not initialize freelist\n");
 933                 return -ENOMEM;
 934         }
 935
 936         return 0;
 937 }
 938
 939 static int mga_do_cleanup_dma(struct drm_device *dev, int full_cleanup)
 940 {
 941         int err = 0;
 942         DRM_DEBUG("\n");
 943
 944         /* Make sure interrupts are disabled here because the uninstall ioctl
 945          * may not have been called from userspace and after dev_private
 946          * is freed, it's too late.
 947          */
 948         if (dev->irq_enabled)
 949                 drm_irq_uninstall(dev);
 950
 951         if (dev->dev_private) {
 952                 drm_mga_private_t *dev_priv = dev->dev_private;
 953
 954                 if ((dev_priv->warp != NULL)
 955                     && (dev_priv->warp->type != _DRM_CONSISTENT))
 956                         drm_core_ioremapfree(dev_priv->warp, dev);
 957
 958                 if ((dev_priv->primary != NULL)
 959                     && (dev_priv->primary->type != _DRM_CONSISTENT))
 960                         drm_core_ioremapfree(dev_priv->primary, dev);
 961
 962                 if (dev->agp_buffer_map != NULL)
 963                         drm_core_ioremapfree(dev->agp_buffer_map, dev);
 964
 965                 if (dev_priv->used_new_dma_init) {
 966 #if __OS_HAS_AGP
 967                         if (dev_priv->agp_handle != 0) {
 968                                 struct drm_agp_binding unbind_req;
 969                                 struct drm_agp_buffer free_req;
 970
 971                                 unbind_req.handle = dev_priv->agp_handle;
 972                                 drm_agp_unbind(dev, &unbind_req);
 973
 974                                 free_req.handle = dev_priv->agp_handle;
 975                                 drm_agp_free(dev, &free_req);
 976
 977                                 dev_priv->agp_textures = NULL;
 978                                 dev_priv->agp_size = 0;
 979                                 dev_priv->agp_handle = 0;
 980                         }
 981
 982                         if ((dev->agp != NULL) && dev->agp->acquired) {
 983                                 err = drm_agp_release(dev);
 984                         }
 985 #endif
 986                 }
 987
 988                 dev_priv->warp = NULL;
 989                 dev_priv->primary = NULL;
 990                 dev_priv->sarea = NULL;
 991                 dev_priv->sarea_priv = NULL;
 992                 dev->agp_buffer_map = NULL;
 993
 994                 if (full_cleanup) {
 995                         dev_priv->mmio = NULL;
 996                         dev_priv->status = NULL;
 997                         dev_priv->used_new_dma_init = 0;
 998                 }
 999
1000                 memset(&dev_priv->prim, 0, sizeof(dev_priv->prim));
1001                 dev_priv->warp_pipe = 0;
1002                 memset(dev_priv->warp_pipe_phys, 0,
1003                        sizeof(dev_priv->warp_pipe_phys));
1004
1005                 if (dev_priv->head != NULL) {
1006                         mga_freelist_cleanup(dev);
1007                 }
1008         }
1009
1010         return err;
1011 }
1012
1013 int mga_dma_init(struct drm_device *dev, void *data,
1014                  struct drm_file *file_priv)
1015 {
1016         drm_mga_init_t *init = data;
1017         int err;
1018
1019         LOCK_TEST_WITH_RETURN(dev, file_priv);
1020
1021         switch (init->func) {
1022         case MGA_INIT_DMA:
1023                 err = mga_do_init_dma(dev, init);
1024                 if (err) {
1025                         (void)mga_do_cleanup_dma(dev, FULL_CLEANUP);
1026                 }
1027                 return err;
1028         case MGA_CLEANUP_DMA:
1029                 return mga_do_cleanup_dma(dev, FULL_CLEANUP);
1030         }
1031
1032         return -EINVAL;
1033 }
1034
1035 /* ================================================================
1036  * Primary DMA stream management
1037  */
1038
1039 int mga_dma_flush(struct drm_device *dev, void *data,
1040                   struct drm_file *file_priv)
1041 {
1042         drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1043         struct drm_lock *lock = data;
1044
1045         LOCK_TEST_WITH_RETURN(dev, file_priv);
1046
1047         DRM_DEBUG("%s%s%s\n",
1048                   (lock->flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
1049                   (lock->flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
1050                   (lock->flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "");
1051
1052         WRAP_WAIT_WITH_RETURN(dev_priv);
1053
1054         if (lock->flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL)) {
1055                 mga_do_dma_flush(dev_priv);
1056         }
1057
1058         if (lock->flags & _DRM_LOCK_QUIESCENT) {
1059 #if MGA_DMA_DEBUG
1060                 int ret = mga_do_wait_for_idle(dev_priv);
1061                 if (ret < 0)
1062                         DRM_INFO("-EBUSY\n");
1063                 return ret;
1064 #else
1065                 return mga_do_wait_for_idle(dev_priv);
1066 #endif
1067         } else {
1068                 return 0;
1069         }
1070 }
1071
1072 int mga_dma_reset(struct drm_device *dev, void *data,
1073                   struct drm_file *file_priv)
1074 {
1075         drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1076
1077         LOCK_TEST_WITH_RETURN(dev, file_priv);
1078
1079         return mga_do_dma_reset(dev_priv);
1080 }
1081
1082 /* ================================================================
1083  * DMA buffer management
1084  */
1085
1086 static int mga_dma_get_buffers(struct drm_device * dev,
1087                                struct drm_file *file_priv, struct drm_dma * d)
1088 {
1089         struct drm_buf *buf;
1090         int i;
1091
1092         for (i = d->granted_count; i < d->request_count; i++) {
1093                 buf = mga_freelist_get(dev);
1094                 if (!buf)
1095                         return -EAGAIN;
1096
1097                 buf->file_priv = file_priv;
1098
1099                 if (DRM_COPY_TO_USER(&d->request_indices[i],
1100                                      &buf->idx, sizeof(buf->idx)))
1101                         return -EFAULT;
1102                 if (DRM_COPY_TO_USER(&d->request_sizes[i],
1103                                      &buf->total, sizeof(buf->total)))
1104                         return -EFAULT;
1105
1106                 d->granted_count++;
1107         }
1108         return 0;
1109 }
1110
1111 int mga_dma_buffers(struct drm_device *dev, void *data,
1112                     struct drm_file *file_priv)
1113 {
1114         struct drm_device_dma *dma = dev->dma;
1115         drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1116         struct drm_dma *d = data;
1117         int ret = 0;
1118
1119         LOCK_TEST_WITH_RETURN(dev, file_priv);
1120
1121         /* Please don't send us buffers.
1122          */
1123         if (d->send_count != 0) {
1124                 DRM_ERROR("Process %d trying to send %d buffers via drmDMA\n",
1125                           DRM_CURRENTPID, d->send_count);
1126                 return -EINVAL;
1127         }
1128
1129         /* We'll send you buffers.
1130          */
1131         if (d->request_count < 0 || d->request_count > dma->buf_count) {
1132                 DRM_ERROR("Process %d trying to get %d buffers (of %d max)\n",
1133                           DRM_CURRENTPID, d->request_count, dma->buf_count);
1134                 return -EINVAL;
1135         }
1136
1137         WRAP_TEST_WITH_RETURN(dev_priv);
1138
1139         d->granted_count = 0;
1140
1141         if (d->request_count) {
1142                 ret = mga_dma_get_buffers(dev, file_priv, d);
1143         }
1144
1145         return ret;
1146 }
1147
1148 /**
1149  * Called just before the module is unloaded.
1150  */
1151 int mga_driver_unload(struct drm_device * dev)
1152 {
1153         drm_free(dev->dev_private, sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
1154         dev->dev_private = NULL;
1155
1156         return 0;
1157 }
1158
1159 /**
1160  * Called when the last opener of the device is closed.
1161  */
1162 void mga_driver_lastclose(struct drm_device * dev)
1163 {
1164         mga_do_cleanup_dma(dev, FULL_CLEANUP);
1165 }
1166
1167 int mga_driver_dma_quiescent(struct drm_device * dev)
1168 {
1169         drm_mga_private_t *dev_priv = dev->dev_private;
1170         return mga_do_wait_for_idle(dev_priv);
1171 }