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