git.oblomov.eu Git - linux-2.6/blob - drivers/char/drm/via_dma.c

   1 /* via_dma.c -- DMA support for the VIA Unichrome/Pro
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Copyright 2004 Digeo, Inc., Palo Alto, CA, U.S.A.
   7  * All Rights Reserved.
   8  *
   9  * Copyright 2004 The Unichrome project.
  10  * All Rights Reserved.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a
  13  * copy of this software and associated documentation files (the "Software"),
  14  * to deal in the Software without restriction, including without limitation
  15  * the rights to use, copy, modify, merge, publish, distribute, sub license,
  16  * and/or sell copies of the Software, and to permit persons to whom the
  17  * Software is furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice (including the
  20  * next paragraph) shall be included in all copies or substantial portions
  21  * of the Software.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  24  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  25  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  26  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  27  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  28  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  29  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  30  *
  31  * Authors:
  32  *    Tungsten Graphics,
  33  *    Erdi Chen,
  34  *    Thomas Hellstrom.
  35  */
  36
  37 #include "drmP.h"
  38 #include "drm.h"
  39 #include "via_drm.h"
  40 #include "via_drv.h"
  41 #include "via_3d_reg.h"
  42
  43 #define CMDBUF_ALIGNMENT_SIZE   (0x100)
  44 #define CMDBUF_ALIGNMENT_MASK   (0x0ff)
  45
  46 /* defines for VIA 3D registers */
  47 #define VIA_REG_STATUS          0x400
  48 #define VIA_REG_TRANSET         0x43C
  49 #define VIA_REG_TRANSPACE       0x440
  50
  51 /* VIA_REG_STATUS(0x400): Engine Status */
  52 #define VIA_CMD_RGTR_BUSY       0x00000080      /* Command Regulator is busy */
  53 #define VIA_2D_ENG_BUSY         0x00000001      /* 2D Engine is busy */
  54 #define VIA_3D_ENG_BUSY         0x00000002      /* 3D Engine is busy */
  55 #define VIA_VR_QUEUE_BUSY       0x00020000      /* Virtual Queue is busy */
  56
  57 #define SetReg2DAGP(nReg, nData) {                              \
  58         *((uint32_t *)(vb)) = ((nReg) >> 2) | HALCYON_HEADER1;  \
  59         *((uint32_t *)(vb) + 1) = (nData);                      \
  60         vb = ((uint32_t *)vb) + 2;                              \
  61         dev_priv->dma_low +=8;                                  \
  62 }
  63
  64 #define via_flush_write_combine() DRM_MEMORYBARRIER()
  65
  66 #define VIA_OUT_RING_QW(w1,w2)                  \
  67         *vb++ = (w1);                           \
  68         *vb++ = (w2);                           \
  69         dev_priv->dma_low += 8;
  70
  71 static void via_cmdbuf_start(drm_via_private_t * dev_priv);
  72 static void via_cmdbuf_pause(drm_via_private_t * dev_priv);
  73 static void via_cmdbuf_reset(drm_via_private_t * dev_priv);
  74 static void via_cmdbuf_rewind(drm_via_private_t * dev_priv);
  75 static int via_wait_idle(drm_via_private_t * dev_priv);
  76 static void via_pad_cache(drm_via_private_t * dev_priv, int qwords);
  77
  78 /*
  79  * Free space in command buffer.
  80  */
  81
  82 static uint32_t via_cmdbuf_space(drm_via_private_t * dev_priv)
  83 {
  84         uint32_t agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
  85         uint32_t hw_addr = *(dev_priv->hw_addr_ptr) - agp_base;
  86
  87         return ((hw_addr <= dev_priv->dma_low) ?
  88                 (dev_priv->dma_high + hw_addr - dev_priv->dma_low) :
  89                 (hw_addr - dev_priv->dma_low));
  90 }
  91
  92 /*
  93  * How much does the command regulator lag behind?
  94  */
  95
  96 static uint32_t via_cmdbuf_lag(drm_via_private_t * dev_priv)
  97 {
  98         uint32_t agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
  99         uint32_t hw_addr = *(dev_priv->hw_addr_ptr) - agp_base;
 100
 101         return ((hw_addr <= dev_priv->dma_low) ?
 102                 (dev_priv->dma_low - hw_addr) :
 103                 (dev_priv->dma_wrap + dev_priv->dma_low - hw_addr));
 104 }
 105
 106 /*
 107  * Check that the given size fits in the buffer, otherwise wait.
 108  */
 109
 110 static inline int
 111 via_cmdbuf_wait(drm_via_private_t * dev_priv, unsigned int size)
 112 {
 113         uint32_t agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
 114         uint32_t cur_addr, hw_addr, next_addr;
 115         volatile uint32_t *hw_addr_ptr;
 116         uint32_t count;
 117         hw_addr_ptr = dev_priv->hw_addr_ptr;
 118         cur_addr = dev_priv->dma_low;
 119         next_addr = cur_addr + size + 512 * 1024;
 120         count = 1000000;
 121         do {
 122                 hw_addr = *hw_addr_ptr - agp_base;
 123                 if (count-- == 0) {
 124                         DRM_ERROR
 125                             ("via_cmdbuf_wait timed out hw %x cur_addr %x next_addr %x\n",
 126                              hw_addr, cur_addr, next_addr);
 127                         return -1;
 128                 }
 129         } while ((cur_addr < hw_addr) && (next_addr >= hw_addr));
 130         return 0;
 131 }
 132
 133 /*
 134  * Checks whether buffer head has reach the end. Rewind the ring buffer
 135  * when necessary.
 136  *
 137  * Returns virtual pointer to ring buffer.
 138  */
 139
 140 static inline uint32_t *via_check_dma(drm_via_private_t * dev_priv,
 141                                       unsigned int size)
 142 {
 143         if ((dev_priv->dma_low + size + 4 * CMDBUF_ALIGNMENT_SIZE) >
 144             dev_priv->dma_high) {
 145                 via_cmdbuf_rewind(dev_priv);
 146         }
 147         if (via_cmdbuf_wait(dev_priv, size) != 0) {
 148                 return NULL;
 149         }
 150
 151         return (uint32_t *) (dev_priv->dma_ptr + dev_priv->dma_low);
 152 }
 153
 154 int via_dma_cleanup(drm_device_t * dev)
 155 {
 156         if (dev->dev_private) {
 157                 drm_via_private_t *dev_priv =
 158                     (drm_via_private_t *) dev->dev_private;
 159
 160                 if (dev_priv->ring.virtual_start) {
 161                         via_cmdbuf_reset(dev_priv);
 162
 163                         drm_core_ioremapfree(&dev_priv->ring.map, dev);
 164                         dev_priv->ring.virtual_start = NULL;
 165                 }
 166
 167         }
 168
 169         return 0;
 170 }
 171
 172 static int via_initialize(drm_device_t * dev,
 173                           drm_via_private_t * dev_priv,
 174                           drm_via_dma_init_t * init)
 175 {
 176         if (!dev_priv || !dev_priv->mmio) {
 177                 DRM_ERROR("via_dma_init called before via_map_init\n");
 178                 return DRM_ERR(EFAULT);
 179         }
 180
 181         if (dev_priv->ring.virtual_start != NULL) {
 182                 DRM_ERROR("%s called again without calling cleanup\n",
 183                           __FUNCTION__);
 184                 return DRM_ERR(EFAULT);
 185         }
 186
 187         if (!dev->agp || !dev->agp->base) {
 188                 DRM_ERROR("%s called with no agp memory available\n",
 189                           __FUNCTION__);
 190                 return DRM_ERR(EFAULT);
 191         }
 192
 193         dev_priv->ring.map.offset = dev->agp->base + init->offset;
 194         dev_priv->ring.map.size = init->size;
 195         dev_priv->ring.map.type = 0;
 196         dev_priv->ring.map.flags = 0;
 197         dev_priv->ring.map.mtrr = 0;
 198
 199         drm_core_ioremap(&dev_priv->ring.map, dev);
 200
 201         if (dev_priv->ring.map.handle == NULL) {
 202                 via_dma_cleanup(dev);
 203                 DRM_ERROR("can not ioremap virtual address for"
 204                           " ring buffer\n");
 205                 return DRM_ERR(ENOMEM);
 206         }
 207
 208         dev_priv->ring.virtual_start = dev_priv->ring.map.handle;
 209
 210         dev_priv->dma_ptr = dev_priv->ring.virtual_start;
 211         dev_priv->dma_low = 0;
 212         dev_priv->dma_high = init->size;
 213         dev_priv->dma_wrap = init->size;
 214         dev_priv->dma_offset = init->offset;
 215         dev_priv->last_pause_ptr = NULL;
 216         dev_priv->hw_addr_ptr =
 217                 (volatile uint32_t *)((char *)dev_priv->mmio->handle +
 218                 init->reg_pause_addr);
 219
 220         via_cmdbuf_start(dev_priv);
 221
 222         return 0;
 223 }
 224
 225 static int via_dma_init(DRM_IOCTL_ARGS)
 226 {
 227         DRM_DEVICE;
 228         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 229         drm_via_dma_init_t init;
 230         int retcode = 0;
 231
 232         DRM_COPY_FROM_USER_IOCTL(init, (drm_via_dma_init_t __user *) data,
 233                                  sizeof(init));
 234
 235         switch (init.func) {
 236         case VIA_INIT_DMA:
 237                 if (!DRM_SUSER(DRM_CURPROC))
 238                         retcode = DRM_ERR(EPERM);
 239                 else
 240                         retcode = via_initialize(dev, dev_priv, &init);
 241                 break;
 242         case VIA_CLEANUP_DMA:
 243                 if (!DRM_SUSER(DRM_CURPROC))
 244                         retcode = DRM_ERR(EPERM);
 245                 else
 246                         retcode = via_dma_cleanup(dev);
 247                 break;
 248         case VIA_DMA_INITIALIZED:
 249                 retcode = (dev_priv->ring.virtual_start != NULL) ?
 250                     0 : DRM_ERR(EFAULT);
 251                 break;
 252         default:
 253                 retcode = DRM_ERR(EINVAL);
 254                 break;
 255         }
 256
 257         return retcode;
 258 }
 259
 260 static int via_dispatch_cmdbuffer(drm_device_t * dev, drm_via_cmdbuffer_t * cmd)
 261 {
 262         drm_via_private_t *dev_priv;
 263         uint32_t *vb;
 264         int ret;
 265
 266         dev_priv = (drm_via_private_t *) dev->dev_private;
 267
 268         if (dev_priv->ring.virtual_start == NULL) {
 269                 DRM_ERROR("%s called without initializing AGP ring buffer.\n",
 270                           __FUNCTION__);
 271                 return DRM_ERR(EFAULT);
 272         }
 273
 274         if (cmd->size > VIA_PCI_BUF_SIZE) {
 275                 return DRM_ERR(ENOMEM);
 276         }
 277
 278         if (DRM_COPY_FROM_USER(dev_priv->pci_buf, cmd->buf, cmd->size))
 279                 return DRM_ERR(EFAULT);
 280
 281         /*
 282          * Running this function on AGP memory is dead slow. Therefore
 283          * we run it on a temporary cacheable system memory buffer and
 284          * copy it to AGP memory when ready.
 285          */
 286
 287         if ((ret =
 288              via_verify_command_stream((uint32_t *) dev_priv->pci_buf,
 289                                        cmd->size, dev, 1))) {
 290                 return ret;
 291         }
 292
 293         vb = via_check_dma(dev_priv, (cmd->size < 0x100) ? 0x102 : cmd->size);
 294         if (vb == NULL) {
 295                 return DRM_ERR(EAGAIN);
 296         }
 297
 298         memcpy(vb, dev_priv->pci_buf, cmd->size);
 299
 300         dev_priv->dma_low += cmd->size;
 301
 302         /*
 303          * Small submissions somehow stalls the CPU. (AGP cache effects?)
 304          * pad to greater size.
 305          */
 306
 307         if (cmd->size < 0x100)
 308                 via_pad_cache(dev_priv, (0x100 - cmd->size) >> 3);
 309         via_cmdbuf_pause(dev_priv);
 310
 311         return 0;
 312 }
 313
 314 int via_driver_dma_quiescent(drm_device_t * dev)
 315 {
 316         drm_via_private_t *dev_priv = dev->dev_private;
 317
 318         if (!via_wait_idle(dev_priv)) {
 319                 return DRM_ERR(EBUSY);
 320         }
 321         return 0;
 322 }
 323
 324 static int via_flush_ioctl(DRM_IOCTL_ARGS)
 325 {
 326         DRM_DEVICE;
 327
 328         LOCK_TEST_WITH_RETURN(dev, filp);
 329
 330         return via_driver_dma_quiescent(dev);
 331 }
 332
 333 static int via_cmdbuffer(DRM_IOCTL_ARGS)
 334 {
 335         DRM_DEVICE;
 336         drm_via_cmdbuffer_t cmdbuf;
 337         int ret;
 338
 339         LOCK_TEST_WITH_RETURN(dev, filp);
 340
 341         DRM_COPY_FROM_USER_IOCTL(cmdbuf, (drm_via_cmdbuffer_t __user *) data,
 342                                  sizeof(cmdbuf));
 343
 344         DRM_DEBUG("via cmdbuffer, buf %p size %lu\n", cmdbuf.buf, cmdbuf.size);
 345
 346         ret = via_dispatch_cmdbuffer(dev, &cmdbuf);
 347         if (ret) {
 348                 return ret;
 349         }
 350
 351         return 0;
 352 }
 353
 354 static int via_dispatch_pci_cmdbuffer(drm_device_t * dev,
 355                                       drm_via_cmdbuffer_t * cmd)
 356 {
 357         drm_via_private_t *dev_priv = dev->dev_private;
 358         int ret;
 359
 360         if (cmd->size > VIA_PCI_BUF_SIZE) {
 361                 return DRM_ERR(ENOMEM);
 362         }
 363         if (DRM_COPY_FROM_USER(dev_priv->pci_buf, cmd->buf, cmd->size))
 364                 return DRM_ERR(EFAULT);
 365
 366         if ((ret =
 367              via_verify_command_stream((uint32_t *) dev_priv->pci_buf,
 368                                        cmd->size, dev, 0))) {
 369                 return ret;
 370         }
 371
 372         ret =
 373             via_parse_command_stream(dev, (const uint32_t *)dev_priv->pci_buf,
 374                                      cmd->size);
 375         return ret;
 376 }
 377
 378 static int via_pci_cmdbuffer(DRM_IOCTL_ARGS)
 379 {
 380         DRM_DEVICE;
 381         drm_via_cmdbuffer_t cmdbuf;
 382         int ret;
 383
 384         LOCK_TEST_WITH_RETURN(dev, filp);
 385
 386         DRM_COPY_FROM_USER_IOCTL(cmdbuf, (drm_via_cmdbuffer_t __user *) data,
 387                                  sizeof(cmdbuf));
 388
 389         DRM_DEBUG("via_pci_cmdbuffer, buf %p size %lu\n", cmdbuf.buf,
 390                   cmdbuf.size);
 391
 392         ret = via_dispatch_pci_cmdbuffer(dev, &cmdbuf);
 393         if (ret) {
 394                 return ret;
 395         }
 396
 397         return 0;
 398 }
 399
 400 static inline uint32_t *via_align_buffer(drm_via_private_t * dev_priv,
 401                                          uint32_t * vb, int qw_count)
 402 {
 403         for (; qw_count > 0; --qw_count) {
 404                 VIA_OUT_RING_QW(HC_DUMMY, HC_DUMMY);
 405         }
 406         return vb;
 407 }
 408
 409 /*
 410  * This function is used internally by ring buffer mangement code.
 411  *
 412  * Returns virtual pointer to ring buffer.
 413  */
 414 static inline uint32_t *via_get_dma(drm_via_private_t * dev_priv)
 415 {
 416         return (uint32_t *) (dev_priv->dma_ptr + dev_priv->dma_low);
 417 }
 418
 419 /*
 420  * Hooks a segment of data into the tail of the ring-buffer by
 421  * modifying the pause address stored in the buffer itself. If
 422  * the regulator has already paused, restart it.
 423  */
 424 static int via_hook_segment(drm_via_private_t * dev_priv,
 425                             uint32_t pause_addr_hi, uint32_t pause_addr_lo,
 426                             int no_pci_fire)
 427 {
 428         int paused, count;
 429         volatile uint32_t *paused_at = dev_priv->last_pause_ptr;
 430
 431         via_flush_write_combine();
 432         while (!*(via_get_dma(dev_priv) - 1)) ;
 433         *dev_priv->last_pause_ptr = pause_addr_lo;
 434         via_flush_write_combine();
 435
 436         /*
 437          * The below statement is inserted to really force the flush.
 438          * Not sure it is needed.
 439          */
 440
 441         while (!*dev_priv->last_pause_ptr) ;
 442         dev_priv->last_pause_ptr = via_get_dma(dev_priv) - 1;
 443         while (!*dev_priv->last_pause_ptr) ;
 444
 445         paused = 0;
 446         count = 20;
 447
 448         while (!(paused = (VIA_READ(0x41c) & 0x80000000)) && count--) ;
 449         if ((count <= 8) && (count >= 0)) {
 450                 uint32_t rgtr, ptr;
 451                 rgtr = *(dev_priv->hw_addr_ptr);
 452                 ptr = ((volatile char *)dev_priv->last_pause_ptr -
 453                       dev_priv->dma_ptr) + dev_priv->dma_offset +
 454                       (uint32_t) dev_priv->agpAddr + 4 - CMDBUF_ALIGNMENT_SIZE;
 455                 if (rgtr <= ptr) {
 456                         DRM_ERROR
 457                             ("Command regulator\npaused at count %d, address %x, "
 458                              "while current pause address is %x.\n"
 459                              "Please mail this message to "
 460                              "<unichrome-devel@lists.sourceforge.net>\n", count,
 461                              rgtr, ptr);
 462                 }
 463         }
 464
 465         if (paused && !no_pci_fire) {
 466                 uint32_t rgtr, ptr;
 467                 uint32_t ptr_low;
 468
 469                 count = 1000000;
 470                 while ((VIA_READ(VIA_REG_STATUS) & VIA_CMD_RGTR_BUSY)
 471                        && count--) ;
 472
 473                 rgtr = *(dev_priv->hw_addr_ptr);
 474                 ptr = ((volatile char *)paused_at - dev_priv->dma_ptr) +
 475                     dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4;
 476
 477                 ptr_low = (ptr > 3 * CMDBUF_ALIGNMENT_SIZE) ?
 478                     ptr - 3 * CMDBUF_ALIGNMENT_SIZE : 0;
 479                 if (rgtr <= ptr && rgtr >= ptr_low) {
 480                         VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16));
 481                         VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi);
 482                         VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo);
 483                 }
 484         }
 485         return paused;
 486 }
 487
 488 static int via_wait_idle(drm_via_private_t * dev_priv)
 489 {
 490         int count = 10000000;
 491         while (count-- && (VIA_READ(VIA_REG_STATUS) &
 492                            (VIA_CMD_RGTR_BUSY | VIA_2D_ENG_BUSY |
 493                             VIA_3D_ENG_BUSY))) ;
 494         return count;
 495 }
 496
 497 static uint32_t *via_align_cmd(drm_via_private_t * dev_priv, uint32_t cmd_type,
 498                                uint32_t addr, uint32_t * cmd_addr_hi,
 499                                uint32_t * cmd_addr_lo, int skip_wait)
 500 {
 501         uint32_t agp_base;
 502         uint32_t cmd_addr, addr_lo, addr_hi;
 503         uint32_t *vb;
 504         uint32_t qw_pad_count;
 505
 506         if (!skip_wait)
 507                 via_cmdbuf_wait(dev_priv, 2 * CMDBUF_ALIGNMENT_SIZE);
 508
 509         vb = via_get_dma(dev_priv);
 510         VIA_OUT_RING_QW(HC_HEADER2 | ((VIA_REG_TRANSET >> 2) << 12) |
 511                         (VIA_REG_TRANSPACE >> 2), HC_ParaType_PreCR << 16);
 512         agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
 513         qw_pad_count = (CMDBUF_ALIGNMENT_SIZE >> 3) -
 514             ((dev_priv->dma_low & CMDBUF_ALIGNMENT_MASK) >> 3);
 515
 516         cmd_addr = (addr) ? addr :
 517             agp_base + dev_priv->dma_low - 8 + (qw_pad_count << 3);
 518         addr_lo = ((HC_SubA_HAGPBpL << 24) | (cmd_type & HC_HAGPBpID_MASK) |
 519                    (cmd_addr & HC_HAGPBpL_MASK));
 520         addr_hi = ((HC_SubA_HAGPBpH << 24) | (cmd_addr >> 24));
 521
 522         vb = via_align_buffer(dev_priv, vb, qw_pad_count - 1);
 523         VIA_OUT_RING_QW(*cmd_addr_hi = addr_hi, *cmd_addr_lo = addr_lo);
 524         return vb;
 525 }
 526
 527 static void via_cmdbuf_start(drm_via_private_t * dev_priv)
 528 {
 529         uint32_t pause_addr_lo, pause_addr_hi;
 530         uint32_t start_addr, start_addr_lo;
 531         uint32_t end_addr, end_addr_lo;
 532         uint32_t command;
 533         uint32_t agp_base;
 534
 535         dev_priv->dma_low = 0;
 536
 537         agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
 538         start_addr = agp_base;
 539         end_addr = agp_base + dev_priv->dma_high;
 540
 541         start_addr_lo = ((HC_SubA_HAGPBstL << 24) | (start_addr & 0xFFFFFF));
 542         end_addr_lo = ((HC_SubA_HAGPBendL << 24) | (end_addr & 0xFFFFFF));
 543         command = ((HC_SubA_HAGPCMNT << 24) | (start_addr >> 24) |
 544                    ((end_addr & 0xff000000) >> 16));
 545
 546         dev_priv->last_pause_ptr =
 547             via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0,
 548                           &pause_addr_hi, &pause_addr_lo, 1) - 1;
 549
 550         via_flush_write_combine();
 551         while (!*dev_priv->last_pause_ptr) ;
 552
 553         VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16));
 554         VIA_WRITE(VIA_REG_TRANSPACE, command);
 555         VIA_WRITE(VIA_REG_TRANSPACE, start_addr_lo);
 556         VIA_WRITE(VIA_REG_TRANSPACE, end_addr_lo);
 557
 558         VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi);
 559         VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo);
 560
 561         VIA_WRITE(VIA_REG_TRANSPACE, command | HC_HAGPCMNT_MASK);
 562 }
 563
 564 static void via_pad_cache(drm_via_private_t * dev_priv, int qwords)
 565 {
 566         uint32_t *vb;
 567
 568         via_cmdbuf_wait(dev_priv, qwords + 2);
 569         vb = via_get_dma(dev_priv);
 570         VIA_OUT_RING_QW(HC_HEADER2, HC_ParaType_NotTex << 16);
 571         via_align_buffer(dev_priv, vb, qwords);
 572 }
 573
 574 static inline void via_dummy_bitblt(drm_via_private_t * dev_priv)
 575 {
 576         uint32_t *vb = via_get_dma(dev_priv);
 577         SetReg2DAGP(0x0C, (0 | (0 << 16)));
 578         SetReg2DAGP(0x10, 0 | (0 << 16));
 579         SetReg2DAGP(0x0, 0x1 | 0x2000 | 0xAA000000);
 580 }
 581
 582 static void via_cmdbuf_jump(drm_via_private_t * dev_priv)
 583 {
 584         uint32_t agp_base;
 585         uint32_t pause_addr_lo, pause_addr_hi;
 586         uint32_t jump_addr_lo, jump_addr_hi;
 587         volatile uint32_t *last_pause_ptr;
 588         uint32_t dma_low_save1, dma_low_save2;
 589
 590         agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
 591         via_align_cmd(dev_priv, HC_HAGPBpID_JUMP, 0, &jump_addr_hi,
 592                       &jump_addr_lo, 0);
 593
 594         dev_priv->dma_wrap = dev_priv->dma_low;
 595
 596         /*
 597          * Wrap command buffer to the beginning.
 598          */
 599
 600         dev_priv->dma_low = 0;
 601         if (via_cmdbuf_wait(dev_priv, CMDBUF_ALIGNMENT_SIZE) != 0) {
 602                 DRM_ERROR("via_cmdbuf_jump failed\n");
 603         }
 604
 605         via_dummy_bitblt(dev_priv);
 606         via_dummy_bitblt(dev_priv);
 607
 608         last_pause_ptr =
 609             via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
 610                           &pause_addr_lo, 0) - 1;
 611         via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
 612                       &pause_addr_lo, 0);
 613
 614         *last_pause_ptr = pause_addr_lo;
 615         dma_low_save1 = dev_priv->dma_low;
 616
 617         /*
 618          * Now, set a trap that will pause the regulator if it tries to rerun the old
 619          * command buffer. (Which may happen if via_hook_segment detecs a command regulator pause
 620          * and reissues the jump command over PCI, while the regulator has already taken the jump
 621          * and actually paused at the current buffer end).
 622          * There appears to be no other way to detect this condition, since the hw_addr_pointer
 623          * does not seem to get updated immediately when a jump occurs.
 624          */
 625
 626         last_pause_ptr =
 627             via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
 628                           &pause_addr_lo, 0) - 1;
 629         via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
 630                       &pause_addr_lo, 0);
 631         *last_pause_ptr = pause_addr_lo;
 632
 633         dma_low_save2 = dev_priv->dma_low;
 634         dev_priv->dma_low = dma_low_save1;
 635         via_hook_segment(dev_priv, jump_addr_hi, jump_addr_lo, 0);
 636         dev_priv->dma_low = dma_low_save2;
 637         via_hook_segment(dev_priv, pause_addr_hi, pause_addr_lo, 0);
 638 }
 639
 640 static void via_cmdbuf_rewind(drm_via_private_t * dev_priv)
 641 {
 642         via_cmdbuf_jump(dev_priv);
 643 }
 644
 645 static void via_cmdbuf_flush(drm_via_private_t * dev_priv, uint32_t cmd_type)
 646 {
 647         uint32_t pause_addr_lo, pause_addr_hi;
 648
 649         via_align_cmd(dev_priv, cmd_type, 0, &pause_addr_hi, &pause_addr_lo, 0);
 650         via_hook_segment(dev_priv, pause_addr_hi, pause_addr_lo, 0);
 651 }
 652
 653 static void via_cmdbuf_pause(drm_via_private_t * dev_priv)
 654 {
 655         via_cmdbuf_flush(dev_priv, HC_HAGPBpID_PAUSE);
 656 }
 657
 658 static void via_cmdbuf_reset(drm_via_private_t * dev_priv)
 659 {
 660         via_cmdbuf_flush(dev_priv, HC_HAGPBpID_STOP);
 661         via_wait_idle(dev_priv);
 662 }
 663
 664 /*
 665  * User interface to the space and lag functions.
 666  */
 667
 668 static int via_cmdbuf_size(DRM_IOCTL_ARGS)
 669 {
 670         DRM_DEVICE;
 671         drm_via_cmdbuf_size_t d_siz;
 672         int ret = 0;
 673         uint32_t tmp_size, count;
 674         drm_via_private_t *dev_priv;
 675
 676         DRM_DEBUG("via cmdbuf_size\n");
 677         LOCK_TEST_WITH_RETURN(dev, filp);
 678
 679         dev_priv = (drm_via_private_t *) dev->dev_private;
 680
 681         if (dev_priv->ring.virtual_start == NULL) {
 682                 DRM_ERROR("%s called without initializing AGP ring buffer.\n",
 683                           __FUNCTION__);
 684                 return DRM_ERR(EFAULT);
 685         }
 686
 687         DRM_COPY_FROM_USER_IOCTL(d_siz, (drm_via_cmdbuf_size_t __user *) data,
 688                                  sizeof(d_siz));
 689
 690         count = 1000000;
 691         tmp_size = d_siz.size;
 692         switch (d_siz.func) {
 693         case VIA_CMDBUF_SPACE:
 694                 while (((tmp_size = via_cmdbuf_space(dev_priv)) < d_siz.size)
 695                        && count--) {
 696                         if (!d_siz.wait) {
 697                                 break;
 698                         }
 699                 }
 700                 if (!count) {
 701                         DRM_ERROR("VIA_CMDBUF_SPACE timed out.\n");
 702                         ret = DRM_ERR(EAGAIN);
 703                 }
 704                 break;
 705         case VIA_CMDBUF_LAG:
 706                 while (((tmp_size = via_cmdbuf_lag(dev_priv)) > d_siz.size)
 707                        && count--) {
 708                         if (!d_siz.wait) {
 709                                 break;
 710                         }
 711                 }
 712                 if (!count) {
 713                         DRM_ERROR("VIA_CMDBUF_LAG timed out.\n");
 714                         ret = DRM_ERR(EAGAIN);
 715                 }
 716                 break;
 717         default:
 718                 ret = DRM_ERR(EFAULT);
 719         }
 720         d_siz.size = tmp_size;
 721
 722         DRM_COPY_TO_USER_IOCTL((drm_via_cmdbuf_size_t __user *) data, d_siz,
 723                                sizeof(d_siz));
 724         return ret;
 725 }
 726
 727 drm_ioctl_desc_t via_ioctls[] = {
 728         [DRM_IOCTL_NR(DRM_VIA_ALLOCMEM)] = {via_mem_alloc, DRM_AUTH},
 729         [DRM_IOCTL_NR(DRM_VIA_FREEMEM)] = {via_mem_free, DRM_AUTH},
 730         [DRM_IOCTL_NR(DRM_VIA_AGP_INIT)] = {via_agp_init, DRM_AUTH|DRM_MASTER},
 731         [DRM_IOCTL_NR(DRM_VIA_FB_INIT)] = {via_fb_init, DRM_AUTH|DRM_MASTER},
 732         [DRM_IOCTL_NR(DRM_VIA_MAP_INIT)] = {via_map_init, DRM_AUTH|DRM_MASTER},
 733         [DRM_IOCTL_NR(DRM_VIA_DEC_FUTEX)] = {via_decoder_futex, DRM_AUTH},
 734         [DRM_IOCTL_NR(DRM_VIA_DMA_INIT)] = {via_dma_init, DRM_AUTH},
 735         [DRM_IOCTL_NR(DRM_VIA_CMDBUFFER)] = {via_cmdbuffer, DRM_AUTH},
 736         [DRM_IOCTL_NR(DRM_VIA_FLUSH)] = {via_flush_ioctl, DRM_AUTH},
 737         [DRM_IOCTL_NR(DRM_VIA_PCICMD)] = {via_pci_cmdbuffer, DRM_AUTH},
 738         [DRM_IOCTL_NR(DRM_VIA_CMDBUF_SIZE)] = {via_cmdbuf_size, DRM_AUTH},
 739         [DRM_IOCTL_NR(DRM_VIA_WAIT_IRQ)] = {via_wait_irq, DRM_AUTH},
 740         [DRM_IOCTL_NR(DRM_VIA_DMA_BLIT)] = {via_dma_blit, DRM_AUTH},
 741         [DRM_IOCTL_NR(DRM_VIA_BLIT_SYNC)] = {via_dma_blit_sync, DRM_AUTH}
 742 };
 743
 744 int via_max_ioctl = DRM_ARRAY_SIZE(via_ioctls);