kernel/drivers/gpu/drm/via/via_verifier.c

   1 /*
   2  * Copyright 2004 The Unichrome Project. All Rights Reserved.
   3  * Copyright 2005 Thomas Hellstrom. All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sub license,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the
  13  * next paragraph) shall be included in all copies or substantial portions
  14  * of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHOR(S), AND/OR THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Author: Thomas Hellstrom 2004, 2005.
  25  * This code was written using docs obtained under NDA from VIA Inc.
  26  *
  27  * Don't run this code directly on an AGP buffer. Due to cache problems it will
  28  * be very slow.
  29  */
  30
  31 #include "via_3d_reg.h"
  32 #include <drm/drmP.h>
  33 #include <drm/via_drm.h>
  34 #include <drm/drm_legacy.h>
  35 #include "via_verifier.h"
  36 #include "via_drv.h"
  37
  38 typedef enum {
  39         state_command,
  40         state_header2,
  41         state_header1,
  42         state_vheader5,
  43         state_vheader6,
  44         state_error
  45 } verifier_state_t;
  46
  47 typedef enum {
  48         no_check = 0,
  49         check_for_header2,
  50         check_for_header1,
  51         check_for_header2_err,
  52         check_for_header1_err,
  53         check_for_fire,
  54         check_z_buffer_addr0,
  55         check_z_buffer_addr1,
  56         check_z_buffer_addr_mode,
  57         check_destination_addr0,
  58         check_destination_addr1,
  59         check_destination_addr_mode,
  60         check_for_dummy,
  61         check_for_dd,
  62         check_texture_addr0,
  63         check_texture_addr1,
  64         check_texture_addr2,
  65         check_texture_addr3,
  66         check_texture_addr4,
  67         check_texture_addr5,
  68         check_texture_addr6,
  69         check_texture_addr7,
  70         check_texture_addr8,
  71         check_texture_addr_mode,
  72         check_for_vertex_count,
  73         check_number_texunits,
  74         forbidden_command
  75 } hazard_t;
  76
  77 /*
  78  * Associates each hazard above with a possible multi-command
  79  * sequence. For example an address that is split over multiple
  80  * commands and that needs to be checked at the first command
  81  * that does not include any part of the address.
  82  */
  83
  84 static drm_via_sequence_t seqs[] = {
  85         no_sequence,
  86         no_sequence,
  87         no_sequence,
  88         no_sequence,
  89         no_sequence,
  90         no_sequence,
  91         z_address,
  92         z_address,
  93         z_address,
  94         dest_address,
  95         dest_address,
  96         dest_address,
  97         no_sequence,
  98         no_sequence,
  99         tex_address,
 100         tex_address,
 101         tex_address,
 102         tex_address,
 103         tex_address,
 104         tex_address,
 105         tex_address,
 106         tex_address,
 107         tex_address,
 108         tex_address,
 109         no_sequence
 110 };
 111
 112 typedef struct {
 113         unsigned int code;
 114         hazard_t hz;
 115 } hz_init_t;
 116
 117 static hz_init_t init_table1[] = {
 118         {0xf2, check_for_header2_err},
 119         {0xf0, check_for_header1_err},
 120         {0xee, check_for_fire},
 121         {0xcc, check_for_dummy},
 122         {0xdd, check_for_dd},
 123         {0x00, no_check},
 124         {0x10, check_z_buffer_addr0},
 125         {0x11, check_z_buffer_addr1},
 126         {0x12, check_z_buffer_addr_mode},
 127         {0x13, no_check},
 128         {0x14, no_check},
 129         {0x15, no_check},
 130         {0x23, no_check},
 131         {0x24, no_check},
 132         {0x33, no_check},
 133         {0x34, no_check},
 134         {0x35, no_check},
 135         {0x36, no_check},
 136         {0x37, no_check},
 137         {0x38, no_check},
 138         {0x39, no_check},
 139         {0x3A, no_check},
 140         {0x3B, no_check},
 141         {0x3C, no_check},
 142         {0x3D, no_check},
 143         {0x3E, no_check},
 144         {0x40, check_destination_addr0},
 145         {0x41, check_destination_addr1},
 146         {0x42, check_destination_addr_mode},
 147         {0x43, no_check},
 148         {0x44, no_check},
 149         {0x50, no_check},
 150         {0x51, no_check},
 151         {0x52, no_check},
 152         {0x53, no_check},
 153         {0x54, no_check},
 154         {0x55, no_check},
 155         {0x56, no_check},
 156         {0x57, no_check},
 157         {0x58, no_check},
 158         {0x70, no_check},
 159         {0x71, no_check},
 160         {0x78, no_check},
 161         {0x79, no_check},
 162         {0x7A, no_check},
 163         {0x7B, no_check},
 164         {0x7C, no_check},
 165         {0x7D, check_for_vertex_count}
 166 };
 167
 168 static hz_init_t init_table2[] = {
 169         {0xf2, check_for_header2_err},
 170         {0xf0, check_for_header1_err},
 171         {0xee, check_for_fire},
 172         {0xcc, check_for_dummy},
 173         {0x00, check_texture_addr0},
 174         {0x01, check_texture_addr0},
 175         {0x02, check_texture_addr0},
 176         {0x03, check_texture_addr0},
 177         {0x04, check_texture_addr0},
 178         {0x05, check_texture_addr0},
 179         {0x06, check_texture_addr0},
 180         {0x07, check_texture_addr0},
 181         {0x08, check_texture_addr0},
 182         {0x09, check_texture_addr0},
 183         {0x20, check_texture_addr1},
 184         {0x21, check_texture_addr1},
 185         {0x22, check_texture_addr1},
 186         {0x23, check_texture_addr4},
 187         {0x2B, check_texture_addr3},
 188         {0x2C, check_texture_addr3},
 189         {0x2D, check_texture_addr3},
 190         {0x2E, check_texture_addr3},
 191         {0x2F, check_texture_addr3},
 192         {0x30, check_texture_addr3},
 193         {0x31, check_texture_addr3},
 194         {0x32, check_texture_addr3},
 195         {0x33, check_texture_addr3},
 196         {0x34, check_texture_addr3},
 197         {0x4B, check_texture_addr5},
 198         {0x4C, check_texture_addr6},
 199         {0x51, check_texture_addr7},
 200         {0x52, check_texture_addr8},
 201         {0x77, check_texture_addr2},
 202         {0x78, no_check},
 203         {0x79, no_check},
 204         {0x7A, no_check},
 205         {0x7B, check_texture_addr_mode},
 206         {0x7C, no_check},
 207         {0x7D, no_check},
 208         {0x7E, no_check},
 209         {0x7F, no_check},
 210         {0x80, no_check},
 211         {0x81, no_check},
 212         {0x82, no_check},
 213         {0x83, no_check},
 214         {0x85, no_check},
 215         {0x86, no_check},
 216         {0x87, no_check},
 217         {0x88, no_check},
 218         {0x89, no_check},
 219         {0x8A, no_check},
 220         {0x90, no_check},
 221         {0x91, no_check},
 222         {0x92, no_check},
 223         {0x93, no_check}
 224 };
 225
 226 static hz_init_t init_table3[] = {
 227         {0xf2, check_for_header2_err},
 228         {0xf0, check_for_header1_err},
 229         {0xcc, check_for_dummy},
 230         {0x00, check_number_texunits}
 231 };
 232
 233 static hazard_t table1[256];
 234 static hazard_t table2[256];
 235 static hazard_t table3[256];
 236
 237 static __inline__ int
 238 eat_words(const uint32_t **buf, const uint32_t *buf_end, unsigned num_words)
 239 {
 240         if ((buf_end - *buf) >= num_words) {
 241                 *buf += num_words;
 242                 return 0;
 243         }
 244         DRM_ERROR("Illegal termination of DMA command buffer\n");
 245         return 1;
 246 }
 247
 248 /*
 249  * Partially stolen from drm_memory.h
 250  */
 251
 252 static __inline__ drm_local_map_t *via_drm_lookup_agp_map(drm_via_state_t *seq,
 253                                                     unsigned long offset,
 254                                                     unsigned long size,
 255                                                     struct drm_device *dev)
 256 {
 257         struct drm_map_list *r_list;
 258         drm_local_map_t *map = seq->map_cache;
 259
 260         if (map && map->offset <= offset
 261             && (offset + size) <= (map->offset + map->size)) {
 262                 return map;
 263         }
 264
 265         list_for_each_entry(r_list, &dev->maplist, head) {
 266                 map = r_list->map;
 267                 if (!map)
 268                         continue;
 269                 if (map->offset <= offset
 270                     && (offset + size) <= (map->offset + map->size)
 271                     && !(map->flags & _DRM_RESTRICTED)
 272                     && (map->type == _DRM_AGP)) {
 273                         seq->map_cache = map;
 274                         return map;
 275                 }
 276         }
 277         return NULL;
 278 }
 279
 280 /*
 281  * Require that all AGP texture levels reside in the same AGP map which should
 282  * be mappable by the client. This is not a big restriction.
 283  * FIXME: To actually enforce this security policy strictly, drm_rmmap
 284  * would have to wait for dma quiescent before removing an AGP map.
 285  * The via_drm_lookup_agp_map call in reality seems to take
 286  * very little CPU time.
 287  */
 288
 289 static __inline__ int finish_current_sequence(drm_via_state_t * cur_seq)
 290 {
 291         switch (cur_seq->unfinished) {
 292         case z_address:
 293                 DRM_DEBUG("Z Buffer start address is 0x%x\n", cur_seq->z_addr);
 294                 break;
 295         case dest_address:
 296                 DRM_DEBUG("Destination start address is 0x%x\n",
 297                           cur_seq->d_addr);
 298                 break;
 299         case tex_address:
 300                 if (cur_seq->agp_texture) {
 301                         unsigned start =
 302                             cur_seq->tex_level_lo[cur_seq->texture];
 303                         unsigned end = cur_seq->tex_level_hi[cur_seq->texture];
 304                         unsigned long lo = ~0, hi = 0, tmp;
 305                         uint32_t *addr, *pitch, *height, tex;
 306                         unsigned i;
 307                         int npot;
 308
 309                         if (end > 9)
 310                                 end = 9;
 311                         if (start > 9)
 312                                 start = 9;
 313
 314                         addr =
 315                             &(cur_seq->t_addr[tex = cur_seq->texture][start]);
 316                         pitch = &(cur_seq->pitch[tex][start]);
 317                         height = &(cur_seq->height[tex][start]);
 318                         npot = cur_seq->tex_npot[tex];
 319                         for (i = start; i <= end; ++i) {
 320                                 tmp = *addr++;
 321                                 if (tmp < lo)
 322                                         lo = tmp;
 323                                 if (i == 0 && npot)
 324                                         tmp += (*height++ * *pitch++);
 325                                 else
 326                                         tmp += (*height++ << *pitch++);
 327                                 if (tmp > hi)
 328                                         hi = tmp;
 329                         }
 330
 331                         if (!via_drm_lookup_agp_map
 332                             (cur_seq, lo, hi - lo, cur_seq->dev)) {
 333                                 DRM_ERROR
 334                                     ("AGP texture is not in allowed map\n");
 335                                 return 2;
 336                         }
 337                 }
 338                 break;
 339         default:
 340                 break;
 341         }
 342         cur_seq->unfinished = no_sequence;
 343         return 0;
 344 }
 345
 346 static __inline__ int
 347 investigate_hazard(uint32_t cmd, hazard_t hz, drm_via_state_t *cur_seq)
 348 {
 349         register uint32_t tmp, *tmp_addr;
 350
 351         if (cur_seq->unfinished && (cur_seq->unfinished != seqs[hz])) {
 352                 int ret;
 353                 if ((ret = finish_current_sequence(cur_seq)))
 354                         return ret;
 355         }
 356
 357         switch (hz) {
 358         case check_for_header2:
 359                 if (cmd == HALCYON_HEADER2)
 360                         return 1;
 361                 return 0;
 362         case check_for_header1:
 363                 if ((cmd & HALCYON_HEADER1MASK) == HALCYON_HEADER1)
 364                         return 1;
 365                 return 0;
 366         case check_for_header2_err:
 367                 if (cmd == HALCYON_HEADER2)
 368                         return 1;
 369                 DRM_ERROR("Illegal DMA HALCYON_HEADER2 command\n");
 370                 break;
 371         case check_for_header1_err:
 372                 if ((cmd & HALCYON_HEADER1MASK) == HALCYON_HEADER1)
 373                         return 1;
 374                 DRM_ERROR("Illegal DMA HALCYON_HEADER1 command\n");
 375                 break;
 376         case check_for_fire:
 377                 if ((cmd & HALCYON_FIREMASK) == HALCYON_FIRECMD)
 378                         return 1;
 379                 DRM_ERROR("Illegal DMA HALCYON_FIRECMD command\n");
 380                 break;
 381         case check_for_dummy:
 382                 if (HC_DUMMY == cmd)
 383                         return 0;
 384                 DRM_ERROR("Illegal DMA HC_DUMMY command\n");
 385                 break;
 386         case check_for_dd:
 387                 if (0xdddddddd == cmd)
 388                         return 0;
 389                 DRM_ERROR("Illegal DMA 0xdddddddd command\n");
 390                 break;
 391         case check_z_buffer_addr0:
 392                 cur_seq->unfinished = z_address;
 393                 cur_seq->z_addr = (cur_seq->z_addr & 0xFF000000) |
 394                     (cmd & 0x00FFFFFF);
 395                 return 0;
 396         case check_z_buffer_addr1:
 397                 cur_seq->unfinished = z_address;
 398                 cur_seq->z_addr = (cur_seq->z_addr & 0x00FFFFFF) |
 399                     ((cmd & 0xFF) << 24);
 400                 return 0;
 401         case check_z_buffer_addr_mode:
 402                 cur_seq->unfinished = z_address;
 403                 if ((cmd & 0x0000C000) == 0)
 404                         return 0;
 405                 DRM_ERROR("Attempt to place Z buffer in system memory\n");
 406                 return 2;
 407         case check_destination_addr0:
 408                 cur_seq->unfinished = dest_address;
 409                 cur_seq->d_addr = (cur_seq->d_addr & 0xFF000000) |
 410                     (cmd & 0x00FFFFFF);
 411                 return 0;
 412         case check_destination_addr1:
 413                 cur_seq->unfinished = dest_address;
 414                 cur_seq->d_addr = (cur_seq->d_addr & 0x00FFFFFF) |
 415                     ((cmd & 0xFF) << 24);
 416                 return 0;
 417         case check_destination_addr_mode:
 418                 cur_seq->unfinished = dest_address;
 419                 if ((cmd & 0x0000C000) == 0)
 420                         return 0;
 421                 DRM_ERROR
 422                     ("Attempt to place 3D drawing buffer in system memory\n");
 423                 return 2;
 424         case check_texture_addr0:
 425                 cur_seq->unfinished = tex_address;
 426                 tmp = (cmd >> 24);
 427                 tmp_addr = &cur_seq->t_addr[cur_seq->texture][tmp];
 428                 *tmp_addr = (*tmp_addr & 0xFF000000) | (cmd & 0x00FFFFFF);
 429                 return 0;
 430         case check_texture_addr1:
 431                 cur_seq->unfinished = tex_address;
 432                 tmp = ((cmd >> 24) - 0x20);
 433                 tmp += tmp << 1;
 434                 tmp_addr = &cur_seq->t_addr[cur_seq->texture][tmp];
 435                 *tmp_addr = (*tmp_addr & 0x00FFFFFF) | ((cmd & 0xFF) << 24);
 436                 tmp_addr++;
 437                 *tmp_addr = (*tmp_addr & 0x00FFFFFF) | ((cmd & 0xFF00) << 16);
 438                 tmp_addr++;
 439                 *tmp_addr = (*tmp_addr & 0x00FFFFFF) | ((cmd & 0xFF0000) << 8);
 440                 return 0;
 441         case check_texture_addr2:
 442                 cur_seq->unfinished = tex_address;
 443                 cur_seq->tex_level_lo[tmp = cur_seq->texture] = cmd & 0x3F;
 444                 cur_seq->tex_level_hi[tmp] = (cmd & 0xFC0) >> 6;
 445                 return 0;
 446         case check_texture_addr3:
 447                 cur_seq->unfinished = tex_address;
 448                 tmp = ((cmd >> 24) - HC_SubA_HTXnL0Pit);
 449                 if (tmp == 0 &&
 450                     (cmd & HC_HTXnEnPit_MASK)) {
 451                         cur_seq->pitch[cur_seq->texture][tmp] =
 452                                 (cmd & HC_HTXnLnPit_MASK);
 453                         cur_seq->tex_npot[cur_seq->texture] = 1;
 454                 } else {
 455                         cur_seq->pitch[cur_seq->texture][tmp] =
 456                                 (cmd & HC_HTXnLnPitE_MASK) >> HC_HTXnLnPitE_SHIFT;
 457                         cur_seq->tex_npot[cur_seq->texture] = 0;
 458                         if (cmd & 0x000FFFFF) {
 459                                 DRM_ERROR
 460                                         ("Unimplemented texture level 0 pitch mode.\n");
 461                                 return 2;
 462                         }
 463                 }
 464                 return 0;
 465         case check_texture_addr4:
 466                 cur_seq->unfinished = tex_address;
 467                 tmp_addr = &cur_seq->t_addr[cur_seq->texture][9];
 468                 *tmp_addr = (*tmp_addr & 0x00FFFFFF) | ((cmd & 0xFF) << 24);
 469                 return 0;
 470         case check_texture_addr5:
 471         case check_texture_addr6:
 472                 cur_seq->unfinished = tex_address;
 473                 /*
 474                  * Texture width. We don't care since we have the pitch.
 475                  */
 476                 return 0;
 477         case check_texture_addr7:
 478                 cur_seq->unfinished = tex_address;
 479                 tmp_addr = &(cur_seq->height[cur_seq->texture][0]);
 480                 tmp_addr[5] = 1 << ((cmd & 0x00F00000) >> 20);
 481                 tmp_addr[4] = 1 << ((cmd & 0x000F0000) >> 16);
 482                 tmp_addr[3] = 1 << ((cmd & 0x0000F000) >> 12);
 483                 tmp_addr[2] = 1 << ((cmd & 0x00000F00) >> 8);
 484                 tmp_addr[1] = 1 << ((cmd & 0x000000F0) >> 4);
 485                 tmp_addr[0] = 1 << (cmd & 0x0000000F);
 486                 return 0;
 487         case check_texture_addr8:
 488                 cur_seq->unfinished = tex_address;
 489                 tmp_addr = &(cur_seq->height[cur_seq->texture][0]);
 490                 tmp_addr[9] = 1 << ((cmd & 0x0000F000) >> 12);
 491                 tmp_addr[8] = 1 << ((cmd & 0x00000F00) >> 8);
 492                 tmp_addr[7] = 1 << ((cmd & 0x000000F0) >> 4);
 493                 tmp_addr[6] = 1 << (cmd & 0x0000000F);
 494                 return 0;
 495         case check_texture_addr_mode:
 496                 cur_seq->unfinished = tex_address;
 497                 if (2 == (tmp = cmd & 0x00000003)) {
 498                         DRM_ERROR
 499                             ("Attempt to fetch texture from system memory.\n");
 500                         return 2;
 501                 }
 502                 cur_seq->agp_texture = (tmp == 3);
 503                 cur_seq->tex_palette_size[cur_seq->texture] =
 504                     (cmd >> 16) & 0x000000007;
 505                 return 0;
 506         case check_for_vertex_count:
 507                 cur_seq->vertex_count = cmd & 0x0000FFFF;
 508                 return 0;
 509         case check_number_texunits:
 510                 cur_seq->multitex = (cmd >> 3) & 1;
 511                 return 0;
 512         default:
 513                 DRM_ERROR("Illegal DMA data: 0x%x\n", cmd);
 514                 return 2;
 515         }
 516         return 2;
 517 }
 518
 519 static __inline__ int
 520 via_check_prim_list(uint32_t const **buffer, const uint32_t * buf_end,
 521                     drm_via_state_t *cur_seq)
 522 {
 523         drm_via_private_t *dev_priv =
 524             (drm_via_private_t *) cur_seq->dev->dev_private;
 525         uint32_t a_fire, bcmd, dw_count;
 526         int ret = 0;
 527         int have_fire;
 528         const uint32_t *buf = *buffer;
 529
 530         while (buf < buf_end) {
 531                 have_fire = 0;
 532                 if ((buf_end - buf) < 2) {
 533                         DRM_ERROR
 534                             ("Unexpected termination of primitive list.\n");
 535                         ret = 1;
 536                         break;
 537                 }
 538                 if ((*buf & HC_ACMD_MASK) != HC_ACMD_HCmdB)
 539                         break;
 540                 bcmd = *buf++;
 541                 if ((*buf & HC_ACMD_MASK) != HC_ACMD_HCmdA) {
 542                         DRM_ERROR("Expected Vertex List A command, got 0x%x\n",
 543                                   *buf);
 544                         ret = 1;
 545                         break;
 546                 }
 547                 a_fire =
 548                     *buf++ | HC_HPLEND_MASK | HC_HPMValidN_MASK |
 549                     HC_HE3Fire_MASK;
 550
 551                 /*
 552                  * How many dwords per vertex ?
 553                  */
 554
 555                 if (cur_seq->agp && ((bcmd & (0xF << 11)) == 0)) {
 556                         DRM_ERROR("Illegal B command vertex data for AGP.\n");
 557                         ret = 1;
 558                         break;
 559                 }
 560
 561                 dw_count = 0;
 562                 if (bcmd & (1 << 7))
 563                         dw_count += (cur_seq->multitex) ? 2 : 1;
 564                 if (bcmd & (1 << 8))
 565                         dw_count += (cur_seq->multitex) ? 2 : 1;
 566                 if (bcmd & (1 << 9))
 567                         dw_count++;
 568                 if (bcmd & (1 << 10))
 569                         dw_count++;
 570                 if (bcmd & (1 << 11))
 571                         dw_count++;
 572                 if (bcmd & (1 << 12))
 573                         dw_count++;
 574                 if (bcmd & (1 << 13))
 575                         dw_count++;
 576                 if (bcmd & (1 << 14))
 577                         dw_count++;
 578
 579                 while (buf < buf_end) {
 580                         if (*buf == a_fire) {
 581                                 if (dev_priv->num_fire_offsets >=
 582                                     VIA_FIRE_BUF_SIZE) {
 583                                         DRM_ERROR("Fire offset buffer full.\n");
 584                                         ret = 1;
 585                                         break;
 586                                 }
 587                                 dev_priv->fire_offsets[dev_priv->
 588                                                        num_fire_offsets++] =
 589                                     buf;
 590                                 have_fire = 1;
 591                                 buf++;
 592                                 if (buf < buf_end && *buf == a_fire)
 593                                         buf++;
 594                                 break;
 595                         }
 596                         if ((*buf == HALCYON_HEADER2) ||
 597                             ((*buf & HALCYON_FIREMASK) == HALCYON_FIRECMD)) {
 598                                 DRM_ERROR("Missing Vertex Fire command, "
 599                                           "Stray Vertex Fire command  or verifier "
 600                                           "lost sync.\n");
 601                                 ret = 1;
 602                                 break;
 603                         }
 604                         if ((ret = eat_words(&buf, buf_end, dw_count)))
 605                                 break;
 606                 }
 607                 if (buf >= buf_end && !have_fire) {
 608                         DRM_ERROR("Missing Vertex Fire command or verifier "
 609                                   "lost sync.\n");
 610                         ret = 1;
 611                         break;
 612                 }
 613                 if (cur_seq->agp && ((buf - cur_seq->buf_start) & 0x01)) {
 614                         DRM_ERROR("AGP Primitive list end misaligned.\n");
 615                         ret = 1;
 616                         break;
 617                 }
 618         }
 619         *buffer = buf;
 620         return ret;
 621 }
 622
 623 static __inline__ verifier_state_t
 624 via_check_header2(uint32_t const **buffer, const uint32_t *buf_end,
 625                   drm_via_state_t *hc_state)
 626 {
 627         uint32_t cmd;
 628         int hz_mode;
 629         hazard_t hz;
 630         const uint32_t *buf = *buffer;
 631         const hazard_t *hz_table;
 632
 633         if ((buf_end - buf) < 2) {
 634                 DRM_ERROR
 635                     ("Illegal termination of DMA HALCYON_HEADER2 sequence.\n");
 636                 return state_error;
 637         }
 638         buf++;
 639         cmd = (*buf++ & 0xFFFF0000) >> 16;
 640
 641         switch (cmd) {
 642         case HC_ParaType_CmdVdata:
 643                 if (via_check_prim_list(&buf, buf_end, hc_state))
 644                         return state_error;
 645                 *buffer = buf;
 646                 return state_command;
 647         case HC_ParaType_NotTex:
 648                 hz_table = table1;
 649                 break;
 650         case HC_ParaType_Tex:
 651                 hc_state->texture = 0;
 652                 hz_table = table2;
 653                 break;
 654         case (HC_ParaType_Tex | (HC_SubType_Tex1 << 8)):
 655                 hc_state->texture = 1;
 656                 hz_table = table2;
 657                 break;
 658         case (HC_ParaType_Tex | (HC_SubType_TexGeneral << 8)):
 659                 hz_table = table3;
 660                 break;
 661         case HC_ParaType_Auto:
 662                 if (eat_words(&buf, buf_end, 2))
 663                         return state_error;
 664                 *buffer = buf;
 665                 return state_command;
 666         case (HC_ParaType_Palette | (HC_SubType_Stipple << 8)):
 667                 if (eat_words(&buf, buf_end, 32))
 668                         return state_error;
 669                 *buffer = buf;
 670                 return state_command;
 671         case (HC_ParaType_Palette | (HC_SubType_TexPalette0 << 8)):
 672         case (HC_ParaType_Palette | (HC_SubType_TexPalette1 << 8)):
 673                 DRM_ERROR("Texture palettes are rejected because of "
 674                           "lack of info how to determine their size.\n");
 675                 return state_error;
 676         case (HC_ParaType_Palette | (HC_SubType_FogTable << 8)):
 677                 DRM_ERROR("Fog factor palettes are rejected because of "
 678                           "lack of info how to determine their size.\n");
 679                 return state_error;
 680         default:
 681
 682                 /*
 683                  * There are some unimplemented HC_ParaTypes here, that
 684                  * need to be implemented if the Mesa driver is extended.
 685                  */
 686
 687                 DRM_ERROR("Invalid or unimplemented HALCYON_HEADER2 "
 688                           "DMA subcommand: 0x%x. Previous dword: 0x%x\n",
 689                           cmd, *(buf - 2));
 690                 *buffer = buf;
 691                 return state_error;
 692         }
 693
 694         while (buf < buf_end) {
 695                 cmd = *buf++;
 696                 if ((hz = hz_table[cmd >> 24])) {
 697                         if ((hz_mode = investigate_hazard(cmd, hz, hc_state))) {
 698                                 if (hz_mode == 1) {
 699                                         buf--;
 700                                         break;
 701                                 }
 702                                 return state_error;
 703                         }
 704                 } else if (hc_state->unfinished &&
 705                            finish_current_sequence(hc_state)) {
 706                         return state_error;
 707                 }
 708         }
 709         if (hc_state->unfinished && finish_current_sequence(hc_state))
 710                 return state_error;
 711         *buffer = buf;
 712         return state_command;
 713 }
 714
 715 static __inline__ verifier_state_t
 716 via_parse_header2(drm_via_private_t *dev_priv, uint32_t const **buffer,
 717                   const uint32_t *buf_end, int *fire_count)
 718 {
 719         uint32_t cmd;
 720         const uint32_t *buf = *buffer;
 721         const uint32_t *next_fire;
 722         int burst = 0;
 723
 724         next_fire = dev_priv->fire_offsets[*fire_count];
 725         buf++;
 726         cmd = (*buf & 0xFFFF0000) >> 16;
 727         VIA_WRITE(HC_REG_TRANS_SET + HC_REG_BASE, *buf++);
 728         switch (cmd) {
 729         case HC_ParaType_CmdVdata:
 730                 while ((buf < buf_end) &&
 731                        (*fire_count < dev_priv->num_fire_offsets) &&
 732                        (*buf & HC_ACMD_MASK) == HC_ACMD_HCmdB) {
 733                         while (buf <= next_fire) {
 734                                 VIA_WRITE(HC_REG_TRANS_SPACE + HC_REG_BASE +
 735                                           (burst & 63), *buf++);
 736                                 burst += 4;
 737                         }
 738                         if ((buf < buf_end)
 739                             && ((*buf & HALCYON_FIREMASK) == HALCYON_FIRECMD))
 740                                 buf++;
 741
 742                         if (++(*fire_count) < dev_priv->num_fire_offsets)
 743                                 next_fire = dev_priv->fire_offsets[*fire_count];
 744                 }
 745                 break;
 746         default:
 747                 while (buf < buf_end) {
 748
 749                         if (*buf == HC_HEADER2 ||
 750                             (*buf & HALCYON_HEADER1MASK) == HALCYON_HEADER1 ||
 751                             (*buf & VIA_VIDEOMASK) == VIA_VIDEO_HEADER5 ||
 752                             (*buf & VIA_VIDEOMASK) == VIA_VIDEO_HEADER6)
 753                                 break;
 754
 755                         VIA_WRITE(HC_REG_TRANS_SPACE + HC_REG_BASE +
 756                                   (burst & 63), *buf++);
 757                         burst += 4;
 758                 }
 759         }
 760         *buffer = buf;
 761         return state_command;
 762 }
 763
 764 static __inline__ int verify_mmio_address(uint32_t address)
 765 {
 766         if ((address > 0x3FF) && (address < 0xC00)) {
 767                 DRM_ERROR("Invalid VIDEO DMA command. "
 768                           "Attempt to access 3D- or command burst area.\n");
 769                 return 1;
 770         } else if ((address > 0xCFF) && (address < 0x1300)) {
 771                 DRM_ERROR("Invalid VIDEO DMA command. "
 772                           "Attempt to access PCI DMA area.\n");
 773                 return 1;
 774         } else if (address > 0x13FF) {
 775                 DRM_ERROR("Invalid VIDEO DMA command. "
 776                           "Attempt to access VGA registers.\n");
 777                 return 1;
 778         }
 779         return 0;
 780 }
 781
 782 static __inline__ int
 783 verify_video_tail(uint32_t const **buffer, const uint32_t * buf_end,
 784                   uint32_t dwords)
 785 {
 786         const uint32_t *buf = *buffer;
 787
 788         if (buf_end - buf < dwords) {
 789                 DRM_ERROR("Illegal termination of video command.\n");
 790                 return 1;
 791         }
 792         while (dwords--) {
 793                 if (*buf++) {
 794                         DRM_ERROR("Illegal video command tail.\n");
 795                         return 1;
 796                 }
 797         }
 798         *buffer = buf;
 799         return 0;
 800 }
 801
 802 static __inline__ verifier_state_t
 803 via_check_header1(uint32_t const **buffer, const uint32_t * buf_end)
 804 {
 805         uint32_t cmd;
 806         const uint32_t *buf = *buffer;
 807         verifier_state_t ret = state_command;
 808
 809         while (buf < buf_end) {
 810                 cmd = *buf;
 811                 if ((cmd > ((0x3FF >> 2) | HALCYON_HEADER1)) &&
 812                     (cmd < ((0xC00 >> 2) | HALCYON_HEADER1))) {
 813                         if ((cmd & HALCYON_HEADER1MASK) != HALCYON_HEADER1)
 814                                 break;
 815                         DRM_ERROR("Invalid HALCYON_HEADER1 command. "
 816                                   "Attempt to access 3D- or command burst area.\n");
 817                         ret = state_error;
 818                         break;
 819                 } else if (cmd > ((0xCFF >> 2) | HALCYON_HEADER1)) {
 820                         if ((cmd & HALCYON_HEADER1MASK) != HALCYON_HEADER1)
 821                                 break;
 822                         DRM_ERROR("Invalid HALCYON_HEADER1 command. "
 823                                   "Attempt to access VGA registers.\n");
 824                         ret = state_error;
 825                         break;
 826                 } else {
 827                         buf += 2;
 828                 }
 829         }
 830         *buffer = buf;
 831         return ret;
 832 }
 833
 834 static __inline__ verifier_state_t
 835 via_parse_header1(drm_via_private_t *dev_priv, uint32_t const **buffer,
 836                   const uint32_t *buf_end)
 837 {
 838         register uint32_t cmd;
 839         const uint32_t *buf = *buffer;
 840
 841         while (buf < buf_end) {
 842                 cmd = *buf;
 843                 if ((cmd & HALCYON_HEADER1MASK) != HALCYON_HEADER1)
 844                         break;
 845                 VIA_WRITE((cmd & ~HALCYON_HEADER1MASK) << 2, *++buf);
 846                 buf++;
 847         }
 848         *buffer = buf;
 849         return state_command;
 850 }
 851
 852 static __inline__ verifier_state_t
 853 via_check_vheader5(uint32_t const **buffer, const uint32_t *buf_end)
 854 {
 855         uint32_t data;
 856         const uint32_t *buf = *buffer;
 857
 858         if (buf_end - buf < 4) {
 859                 DRM_ERROR("Illegal termination of video header5 command\n");
 860                 return state_error;
 861         }
 862
 863         data = *buf++ & ~VIA_VIDEOMASK;
 864         if (verify_mmio_address(data))
 865                 return state_error;
 866
 867         data = *buf++;
 868         if (*buf++ != 0x00F50000) {
 869                 DRM_ERROR("Illegal header5 header data\n");
 870                 return state_error;
 871         }
 872         if (*buf++ != 0x00000000) {
 873                 DRM_ERROR("Illegal header5 header data\n");
 874                 return state_error;
 875         }
 876         if (eat_words(&buf, buf_end, data))
 877                 return state_error;
 878         if ((data & 3) && verify_video_tail(&buf, buf_end, 4 - (data & 3)))
 879                 return state_error;
 880         *buffer = buf;
 881         return state_command;
 882
 883 }
 884
 885 static __inline__ verifier_state_t
 886 via_parse_vheader5(drm_via_private_t *dev_priv, uint32_t const **buffer,
 887                    const uint32_t *buf_end)
 888 {
 889         uint32_t addr, count, i;
 890         const uint32_t *buf = *buffer;
 891
 892         addr = *buf++ & ~VIA_VIDEOMASK;
 893         i = count = *buf;
 894         buf += 3;
 895         while (i--)
 896                 VIA_WRITE(addr, *buf++);
 897         if (count & 3)
 898                 buf += 4 - (count & 3);
 899         *buffer = buf;
 900         return state_command;
 901 }
 902
 903 static __inline__ verifier_state_t
 904 via_check_vheader6(uint32_t const **buffer, const uint32_t * buf_end)
 905 {
 906         uint32_t data;
 907         const uint32_t *buf = *buffer;
 908         uint32_t i;
 909
 910         if (buf_end - buf < 4) {
 911                 DRM_ERROR("Illegal termination of video header6 command\n");
 912                 return state_error;
 913         }
 914         buf++;
 915         data = *buf++;
 916         if (*buf++ != 0x00F60000) {
 917                 DRM_ERROR("Illegal header6 header data\n");
 918                 return state_error;
 919         }
 920         if (*buf++ != 0x00000000) {
 921                 DRM_ERROR("Illegal header6 header data\n");
 922                 return state_error;
 923         }
 924         if ((buf_end - buf) < (data << 1)) {
 925                 DRM_ERROR("Illegal termination of video header6 command\n");
 926                 return state_error;
 927         }
 928         for (i = 0; i < data; ++i) {
 929                 if (verify_mmio_address(*buf++))
 930                         return state_error;
 931                 buf++;
 932         }
 933         data <<= 1;
 934         if ((data & 3) && verify_video_tail(&buf, buf_end, 4 - (data & 3)))
 935                 return state_error;
 936         *buffer = buf;
 937         return state_command;
 938 }
 939
 940 static __inline__ verifier_state_t
 941 via_parse_vheader6(drm_via_private_t *dev_priv, uint32_t const **buffer,
 942                    const uint32_t *buf_end)
 943 {
 944
 945         uint32_t addr, count, i;
 946         const uint32_t *buf = *buffer;
 947
 948         i = count = *++buf;
 949         buf += 3;
 950         while (i--) {
 951                 addr = *buf++;
 952                 VIA_WRITE(addr, *buf++);
 953         }
 954         count <<= 1;
 955         if (count & 3)
 956                 buf += 4 - (count & 3);
 957         *buffer = buf;
 958         return state_command;
 959 }
 960
 961 int
 962 via_verify_command_stream(const uint32_t * buf, unsigned int size,
 963                           struct drm_device * dev, int agp)
 964 {
 965
 966         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 967         drm_via_state_t *hc_state = &dev_priv->hc_state;
 968         drm_via_state_t saved_state = *hc_state;
 969         uint32_t cmd;
 970         const uint32_t *buf_end = buf + (size >> 2);
 971         verifier_state_t state = state_command;
 972         int cme_video;
 973         int supported_3d;
 974
 975         cme_video = (dev_priv->chipset == VIA_PRO_GROUP_A ||
 976                      dev_priv->chipset == VIA_DX9_0);
 977
 978         supported_3d = dev_priv->chipset != VIA_DX9_0;
 979
 980         hc_state->dev = dev;
 981         hc_state->unfinished = no_sequence;
 982         hc_state->map_cache = NULL;
 983         hc_state->agp = agp;
 984         hc_state->buf_start = buf;
 985         dev_priv->num_fire_offsets = 0;
 986
 987         while (buf < buf_end) {
 988
 989                 switch (state) {
 990                 case state_header2:
 991                         state = via_check_header2(&buf, buf_end, hc_state);
 992                         break;
 993                 case state_header1:
 994                         state = via_check_header1(&buf, buf_end);
 995                         break;
 996                 case state_vheader5:
 997                         state = via_check_vheader5(&buf, buf_end);
 998                         break;
 999                 case state_vheader6:
1000                         state = via_check_vheader6(&buf, buf_end);
1001                         break;
1002                 case state_command:
1003                         if ((HALCYON_HEADER2 == (cmd = *buf)) &&
1004                             supported_3d)
1005                                 state = state_header2;
1006                         else if ((cmd & HALCYON_HEADER1MASK) == HALCYON_HEADER1)
1007                                 state = state_header1;
1008                         else if (cme_video
1009                                  && (cmd & VIA_VIDEOMASK) == VIA_VIDEO_HEADER5)
1010                                 state = state_vheader5;
1011                         else if (cme_video
1012                                  && (cmd & VIA_VIDEOMASK) == VIA_VIDEO_HEADER6)
1013                                 state = state_vheader6;
1014                         else if ((cmd == HALCYON_HEADER2) && !supported_3d) {
1015                                 DRM_ERROR("Accelerated 3D is not supported on this chipset yet.\n");
1016                                 state = state_error;
1017                         } else {
1018                                 DRM_ERROR
1019                                     ("Invalid / Unimplemented DMA HEADER command. 0x%x\n",
1020                                      cmd);
1021                                 state = state_error;
1022                         }
1023                         break;
1024                 case state_error:
1025                 default:
1026                         *hc_state = saved_state;
1027                         return -EINVAL;
1028                 }
1029         }
1030         if (state == state_error) {
1031                 *hc_state = saved_state;
1032                 return -EINVAL;
1033         }
1034         return 0;
1035 }
1036
1037 int
1038 via_parse_command_stream(struct drm_device *dev, const uint32_t *buf,
1039                          unsigned int size)
1040 {
1041
1042         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
1043         uint32_t cmd;
1044         const uint32_t *buf_end = buf + (size >> 2);
1045         verifier_state_t state = state_command;
1046         int fire_count = 0;
1047
1048         while (buf < buf_end) {
1049
1050                 switch (state) {
1051                 case state_header2:
1052                         state =
1053                             via_parse_header2(dev_priv, &buf, buf_end,
1054                                               &fire_count);
1055                         break;
1056                 case state_header1:
1057                         state = via_parse_header1(dev_priv, &buf, buf_end);
1058                         break;
1059                 case state_vheader5:
1060                         state = via_parse_vheader5(dev_priv, &buf, buf_end);
1061                         break;
1062                 case state_vheader6:
1063                         state = via_parse_vheader6(dev_priv, &buf, buf_end);
1064                         break;
1065                 case state_command:
1066                         if (HALCYON_HEADER2 == (cmd = *buf))
1067                                 state = state_header2;
1068                         else if ((cmd & HALCYON_HEADER1MASK) == HALCYON_HEADER1)
1069                                 state = state_header1;
1070                         else if ((cmd & VIA_VIDEOMASK) == VIA_VIDEO_HEADER5)
1071                                 state = state_vheader5;
1072                         else if ((cmd & VIA_VIDEOMASK) == VIA_VIDEO_HEADER6)
1073                                 state = state_vheader6;
1074                         else {
1075                                 DRM_ERROR
1076                                     ("Invalid / Unimplemented DMA HEADER command. 0x%x\n",
1077                                      cmd);
1078                                 state = state_error;
1079                         }
1080                         break;
1081                 case state_error:
1082                 default:
1083                         return -EINVAL;
1084                 }
1085         }
1086         if (state == state_error)
1087                 return -EINVAL;
1088         return 0;
1089 }
1090
1091 static void
1092 setup_hazard_table(hz_init_t init_table[], hazard_t table[], int size)
1093 {
1094         int i;
1095
1096         for (i = 0; i < 256; ++i)
1097                 table[i] = forbidden_command;
1098
1099         for (i = 0; i < size; ++i)
1100                 table[init_table[i].code] = init_table[i].hz;
1101 }
1102
1103 void via_init_command_verifier(void)
1104 {
1105         setup_hazard_table(init_table1, table1,
1106                            sizeof(init_table1) / sizeof(hz_init_t));
1107         setup_hazard_table(init_table2, table2,
1108                            sizeof(init_table2) / sizeof(hz_init_t));
1109         setup_hazard_table(init_table3, table3,
1110                            sizeof(init_table3) / sizeof(hz_init_t));
1111 }