drivers/char/drm/r300_cmdbuf.c

   1 /* r300_cmdbuf.c -- Command buffer emission for R300 -*- linux-c -*-
   2  *
   3  * Copyright (C) The Weather Channel, Inc.  2002.
   4  * Copyright (C) 2004 Nicolai Haehnle.
   5  * All Rights Reserved.
   6  *
   7  * The Weather Channel (TM) funded Tungsten Graphics to develop the
   8  * initial release of the Radeon 8500 driver under the XFree86 license.
   9  * This notice must be preserved.
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice (including the next
  19  * paragraph) shall be included in all copies or substantial portions of the
  20  * Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  26  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  27  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  28  * DEALINGS IN THE SOFTWARE.
  29  *
  30  * Authors:
  31  *    Nicolai Haehnle <prefect_@gmx.net>
  32  */
  33
  34 #include "drmP.h"
  35 #include "drm.h"
  36 #include "radeon_drm.h"
  37 #include "radeon_drv.h"
  38 #include "r300_reg.h"
  39
  40 #define R300_SIMULTANEOUS_CLIPRECTS             4
  41
  42 /* Values for R300_RE_CLIPRECT_CNTL depending on the number of cliprects
  43  */
  44 static const int r300_cliprect_cntl[4] = {
  45         0xAAAA,
  46         0xEEEE,
  47         0xFEFE,
  48         0xFFFE
  49 };
  50
  51 /**
  52  * Emit up to R300_SIMULTANEOUS_CLIPRECTS cliprects from the given command
  53  * buffer, starting with index n.
  54  */
  55 static int r300_emit_cliprects(drm_radeon_private_t *dev_priv,
  56                                drm_radeon_kcmd_buffer_t *cmdbuf, int n)
  57 {
  58         drm_clip_rect_t box;
  59         int nr;
  60         int i;
  61         RING_LOCALS;
  62
  63         nr = cmdbuf->nbox - n;
  64         if (nr > R300_SIMULTANEOUS_CLIPRECTS)
  65                 nr = R300_SIMULTANEOUS_CLIPRECTS;
  66
  67         DRM_DEBUG("%i cliprects\n", nr);
  68
  69         if (nr) {
  70                 BEGIN_RING(6 + nr * 2);
  71                 OUT_RING(CP_PACKET0(R300_RE_CLIPRECT_TL_0, nr * 2 - 1));
  72
  73                 for (i = 0; i < nr; ++i) {
  74                         if (DRM_COPY_FROM_USER_UNCHECKED
  75                             (&box, &cmdbuf->boxes[n + i], sizeof(box))) {
  76                                 DRM_ERROR("copy cliprect faulted\n");
  77                                 return DRM_ERR(EFAULT);
  78                         }
  79
  80                         box.x1 =
  81                             (box.x1 +
  82                              R300_CLIPRECT_OFFSET) & R300_CLIPRECT_MASK;
  83                         box.y1 =
  84                             (box.y1 +
  85                              R300_CLIPRECT_OFFSET) & R300_CLIPRECT_MASK;
  86                         box.x2 =
  87                             (box.x2 +
  88                              R300_CLIPRECT_OFFSET) & R300_CLIPRECT_MASK;
  89                         box.y2 =
  90                             (box.y2 +
  91                              R300_CLIPRECT_OFFSET) & R300_CLIPRECT_MASK;
  92
  93                         OUT_RING((box.x1 << R300_CLIPRECT_X_SHIFT) |
  94                                  (box.y1 << R300_CLIPRECT_Y_SHIFT));
  95                         OUT_RING((box.x2 << R300_CLIPRECT_X_SHIFT) |
  96                                  (box.y2 << R300_CLIPRECT_Y_SHIFT));
  97                 }
  98
  99                 OUT_RING_REG(R300_RE_CLIPRECT_CNTL, r300_cliprect_cntl[nr - 1]);
 100
 101                 /* TODO/SECURITY: Force scissors to a safe value, otherwise the
 102                  * client might be able to trample over memory.
 103                  * The impact should be very limited, but I'd rather be safe than
 104                  * sorry.
 105                  */
 106                 OUT_RING(CP_PACKET0(R300_RE_SCISSORS_TL, 1));
 107                 OUT_RING(0);
 108                 OUT_RING(R300_SCISSORS_X_MASK | R300_SCISSORS_Y_MASK);
 109                 ADVANCE_RING();
 110         } else {
 111                 /* Why we allow zero cliprect rendering:
 112                  * There are some commands in a command buffer that must be submitted
 113                  * even when there are no cliprects, e.g. DMA buffer discard
 114                  * or state setting (though state setting could be avoided by
 115                  * simulating a loss of context).
 116                  *
 117                  * Now since the cmdbuf interface is so chaotic right now (and is
 118                  * bound to remain that way for a bit until things settle down),
 119                  * it is basically impossible to filter out the commands that are
 120                  * necessary and those that aren't.
 121                  *
 122                  * So I choose the safe way and don't do any filtering at all;
 123                  * instead, I simply set up the engine so that all rendering
 124                  * can't produce any fragments.
 125                  */
 126                 BEGIN_RING(2);
 127                 OUT_RING_REG(R300_RE_CLIPRECT_CNTL, 0);
 128                 ADVANCE_RING();
 129         }
 130
 131         return 0;
 132 }
 133
 134 static u8 r300_reg_flags[0x10000 >> 2];
 135
 136 void r300_init_reg_flags(void)
 137 {
 138         int i;
 139         memset(r300_reg_flags, 0, 0x10000 >> 2);
 140 #define ADD_RANGE_MARK(reg, count,mark) \
 141                 for(i=((reg)>>2);i<((reg)>>2)+(count);i++)\
 142                         r300_reg_flags[i]|=(mark);
 143
 144 #define MARK_SAFE               1
 145 #define MARK_CHECK_OFFSET       2
 146
 147 #define ADD_RANGE(reg, count)   ADD_RANGE_MARK(reg, count, MARK_SAFE)
 148
 149         /* these match cmducs() command in r300_driver/r300/r300_cmdbuf.c */
 150         ADD_RANGE(R300_SE_VPORT_XSCALE, 6);
 151         ADD_RANGE(0x2080, 1);
 152         ADD_RANGE(R300_SE_VTE_CNTL, 2);
 153         ADD_RANGE(0x2134, 2);
 154         ADD_RANGE(0x2140, 1);
 155         ADD_RANGE(R300_VAP_INPUT_CNTL_0, 2);
 156         ADD_RANGE(0x21DC, 1);
 157         ADD_RANGE(0x221C, 1);
 158         ADD_RANGE(0x2220, 4);
 159         ADD_RANGE(0x2288, 1);
 160         ADD_RANGE(R300_VAP_OUTPUT_VTX_FMT_0, 2);
 161         ADD_RANGE(R300_VAP_PVS_CNTL_1, 3);
 162         ADD_RANGE(R300_GB_ENABLE, 1);
 163         ADD_RANGE(R300_GB_MSPOS0, 5);
 164         ADD_RANGE(R300_TX_CNTL, 1);
 165         ADD_RANGE(R300_TX_ENABLE, 1);
 166         ADD_RANGE(0x4200, 4);
 167         ADD_RANGE(0x4214, 1);
 168         ADD_RANGE(R300_RE_POINTSIZE, 1);
 169         ADD_RANGE(0x4230, 3);
 170         ADD_RANGE(R300_RE_LINE_CNT, 1);
 171         ADD_RANGE(0x4238, 1);
 172         ADD_RANGE(0x4260, 3);
 173         ADD_RANGE(0x4274, 4);
 174         ADD_RANGE(0x4288, 5);
 175         ADD_RANGE(0x42A0, 1);
 176         ADD_RANGE(R300_RE_ZBIAS_T_FACTOR, 4);
 177         ADD_RANGE(0x42B4, 1);
 178         ADD_RANGE(R300_RE_CULL_CNTL, 1);
 179         ADD_RANGE(0x42C0, 2);
 180         ADD_RANGE(R300_RS_CNTL_0, 2);
 181         ADD_RANGE(R300_RS_INTERP_0, 8);
 182         ADD_RANGE(R300_RS_ROUTE_0, 8);
 183         ADD_RANGE(0x43A4, 2);
 184         ADD_RANGE(0x43E8, 1);
 185         ADD_RANGE(R300_PFS_CNTL_0, 3);
 186         ADD_RANGE(R300_PFS_NODE_0, 4);
 187         ADD_RANGE(R300_PFS_TEXI_0, 64);
 188         ADD_RANGE(0x46A4, 5);
 189         ADD_RANGE(R300_PFS_INSTR0_0, 64);
 190         ADD_RANGE(R300_PFS_INSTR1_0, 64);
 191         ADD_RANGE(R300_PFS_INSTR2_0, 64);
 192         ADD_RANGE(R300_PFS_INSTR3_0, 64);
 193         ADD_RANGE(0x4BC0, 1);
 194         ADD_RANGE(0x4BC8, 3);
 195         ADD_RANGE(R300_PP_ALPHA_TEST, 2);
 196         ADD_RANGE(0x4BD8, 1);
 197         ADD_RANGE(R300_PFS_PARAM_0_X, 64);
 198         ADD_RANGE(0x4E00, 1);
 199         ADD_RANGE(R300_RB3D_CBLEND, 2);
 200         ADD_RANGE(R300_RB3D_COLORMASK, 1);
 201         ADD_RANGE(0x4E10, 3);
 202         ADD_RANGE_MARK(R300_RB3D_COLOROFFSET0, 1, MARK_CHECK_OFFSET);   /* check offset */
 203         ADD_RANGE(R300_RB3D_COLORPITCH0, 1);
 204         ADD_RANGE(0x4E50, 9);
 205         ADD_RANGE(0x4E88, 1);
 206         ADD_RANGE(0x4EA0, 2);
 207         ADD_RANGE(R300_RB3D_ZSTENCIL_CNTL_0, 3);
 208         ADD_RANGE(0x4F10, 4);
 209         ADD_RANGE_MARK(R300_RB3D_DEPTHOFFSET, 1, MARK_CHECK_OFFSET);    /* check offset */
 210         ADD_RANGE(R300_RB3D_DEPTHPITCH, 1);
 211         ADD_RANGE(0x4F28, 1);
 212         ADD_RANGE(0x4F30, 2);
 213         ADD_RANGE(0x4F44, 1);
 214         ADD_RANGE(0x4F54, 1);
 215
 216         ADD_RANGE(R300_TX_FILTER_0, 16);
 217         ADD_RANGE(R300_TX_FILTER1_0, 16);
 218         ADD_RANGE(R300_TX_SIZE_0, 16);
 219         ADD_RANGE(R300_TX_FORMAT_0, 16);
 220         ADD_RANGE(R300_TX_PITCH_0, 16);
 221         /* Texture offset is dangerous and needs more checking */
 222         ADD_RANGE_MARK(R300_TX_OFFSET_0, 16, MARK_CHECK_OFFSET);
 223         ADD_RANGE(R300_TX_CHROMA_KEY_0, 16);
 224         ADD_RANGE(R300_TX_BORDER_COLOR_0, 16);
 225
 226         /* Sporadic registers used as primitives are emitted */
 227         ADD_RANGE(0x4f18, 1);
 228         ADD_RANGE(R300_RB3D_DSTCACHE_CTLSTAT, 1);
 229         ADD_RANGE(R300_VAP_INPUT_ROUTE_0_0, 8);
 230         ADD_RANGE(R300_VAP_INPUT_ROUTE_1_0, 8);
 231
 232 }
 233
 234 static __inline__ int r300_check_range(unsigned reg, int count)
 235 {
 236         int i;
 237         if (reg & ~0xffff)
 238                 return -1;
 239         for (i = (reg >> 2); i < (reg >> 2) + count; i++)
 240                 if (r300_reg_flags[i] != MARK_SAFE)
 241                         return 1;
 242         return 0;
 243 }
 244
 245 static __inline__ int r300_emit_carefully_checked_packet0(drm_radeon_private_t *
 246                                                           dev_priv,
 247                                                           drm_radeon_kcmd_buffer_t
 248                                                           * cmdbuf,
 249                                                           drm_r300_cmd_header_t
 250                                                           header)
 251 {
 252         int reg;
 253         int sz;
 254         int i;
 255         int values[64];
 256         RING_LOCALS;
 257
 258         sz = header.packet0.count;
 259         reg = (header.packet0.reghi << 8) | header.packet0.reglo;
 260
 261         if ((sz > 64) || (sz < 0)) {
 262                 DRM_ERROR
 263                     ("Cannot emit more than 64 values at a time (reg=%04x sz=%d)\n",
 264                      reg, sz);
 265                 return DRM_ERR(EINVAL);
 266         }
 267         for (i = 0; i < sz; i++) {
 268                 values[i] = ((int *)cmdbuf->buf)[i];
 269                 switch (r300_reg_flags[(reg >> 2) + i]) {
 270                 case MARK_SAFE:
 271                         break;
 272                 case MARK_CHECK_OFFSET:
 273                         if (!radeon_check_offset(dev_priv, (u32) values[i])) {
 274                                 DRM_ERROR
 275                                     ("Offset failed range check (reg=%04x sz=%d)\n",
 276                                      reg, sz);
 277                                 return DRM_ERR(EINVAL);
 278                         }
 279                         break;
 280                 default:
 281                         DRM_ERROR("Register %04x failed check as flag=%02x\n",
 282                                   reg + i * 4, r300_reg_flags[(reg >> 2) + i]);
 283                         return DRM_ERR(EINVAL);
 284                 }
 285         }
 286
 287         BEGIN_RING(1 + sz);
 288         OUT_RING(CP_PACKET0(reg, sz - 1));
 289         OUT_RING_TABLE(values, sz);
 290         ADVANCE_RING();
 291
 292         cmdbuf->buf += sz * 4;
 293         cmdbuf->bufsz -= sz * 4;
 294
 295         return 0;
 296 }
 297
 298 /**
 299  * Emits a packet0 setting arbitrary registers.
 300  * Called by r300_do_cp_cmdbuf.
 301  *
 302  * Note that checks are performed on contents and addresses of the registers
 303  */
 304 static __inline__ int r300_emit_packet0(drm_radeon_private_t *dev_priv,
 305                                         drm_radeon_kcmd_buffer_t *cmdbuf,
 306                                         drm_r300_cmd_header_t header)
 307 {
 308         int reg;
 309         int sz;
 310         RING_LOCALS;
 311
 312         sz = header.packet0.count;
 313         reg = (header.packet0.reghi << 8) | header.packet0.reglo;
 314
 315         if (!sz)
 316                 return 0;
 317
 318         if (sz * 4 > cmdbuf->bufsz)
 319                 return DRM_ERR(EINVAL);
 320
 321         if (reg + sz * 4 >= 0x10000) {
 322                 DRM_ERROR("No such registers in hardware reg=%04x sz=%d\n", reg,
 323                           sz);
 324                 return DRM_ERR(EINVAL);
 325         }
 326
 327         if (r300_check_range(reg, sz)) {
 328                 /* go and check everything */
 329                 return r300_emit_carefully_checked_packet0(dev_priv, cmdbuf,
 330                                                            header);
 331         }
 332         /* the rest of the data is safe to emit, whatever the values the user passed */
 333
 334         BEGIN_RING(1 + sz);
 335         OUT_RING(CP_PACKET0(reg, sz - 1));
 336         OUT_RING_TABLE((int *)cmdbuf->buf, sz);
 337         ADVANCE_RING();
 338
 339         cmdbuf->buf += sz * 4;
 340         cmdbuf->bufsz -= sz * 4;
 341
 342         return 0;
 343 }
 344
 345 /**
 346  * Uploads user-supplied vertex program instructions or parameters onto
 347  * the graphics card.
 348  * Called by r300_do_cp_cmdbuf.
 349  */
 350 static __inline__ int r300_emit_vpu(drm_radeon_private_t *dev_priv,
 351                                     drm_radeon_kcmd_buffer_t *cmdbuf,
 352                                     drm_r300_cmd_header_t header)
 353 {
 354         int sz;
 355         int addr;
 356         RING_LOCALS;
 357
 358         sz = header.vpu.count;
 359         addr = (header.vpu.adrhi << 8) | header.vpu.adrlo;
 360
 361         if (!sz)
 362                 return 0;
 363         if (sz * 16 > cmdbuf->bufsz)
 364                 return DRM_ERR(EINVAL);
 365
 366         BEGIN_RING(5 + sz * 4);
 367         /* Wait for VAP to come to senses.. */
 368         /* there is no need to emit it multiple times, (only once before VAP is programmed,
 369            but this optimization is for later */
 370         OUT_RING_REG(R300_VAP_PVS_WAITIDLE, 0);
 371         OUT_RING_REG(R300_VAP_PVS_UPLOAD_ADDRESS, addr);
 372         OUT_RING(CP_PACKET0_TABLE(R300_VAP_PVS_UPLOAD_DATA, sz * 4 - 1));
 373         OUT_RING_TABLE((int *)cmdbuf->buf, sz * 4);
 374
 375         ADVANCE_RING();
 376
 377         cmdbuf->buf += sz * 16;
 378         cmdbuf->bufsz -= sz * 16;
 379
 380         return 0;
 381 }
 382
 383 /**
 384  * Emit a clear packet from userspace.
 385  * Called by r300_emit_packet3.
 386  */
 387 static __inline__ int r300_emit_clear(drm_radeon_private_t *dev_priv,
 388                                       drm_radeon_kcmd_buffer_t *cmdbuf)
 389 {
 390         RING_LOCALS;
 391
 392         if (8 * 4 > cmdbuf->bufsz)
 393                 return DRM_ERR(EINVAL);
 394
 395         BEGIN_RING(10);
 396         OUT_RING(CP_PACKET3(R200_3D_DRAW_IMMD_2, 8));
 397         OUT_RING(R300_PRIM_TYPE_POINT | R300_PRIM_WALK_RING |
 398                  (1 << R300_PRIM_NUM_VERTICES_SHIFT));
 399         OUT_RING_TABLE((int *)cmdbuf->buf, 8);
 400         ADVANCE_RING();
 401
 402         cmdbuf->buf += 8 * 4;
 403         cmdbuf->bufsz -= 8 * 4;
 404
 405         return 0;
 406 }
 407
 408 static __inline__ int r300_emit_3d_load_vbpntr(drm_radeon_private_t *dev_priv,
 409                                                drm_radeon_kcmd_buffer_t *cmdbuf,
 410                                                u32 header)
 411 {
 412         int count, i, k;
 413 #define MAX_ARRAY_PACKET  64
 414         u32 payload[MAX_ARRAY_PACKET];
 415         u32 narrays;
 416         RING_LOCALS;
 417
 418         count = (header >> 16) & 0x3fff;
 419
 420         if ((count + 1) > MAX_ARRAY_PACKET) {
 421                 DRM_ERROR("Too large payload in 3D_LOAD_VBPNTR (count=%d)\n",
 422                           count);
 423                 return DRM_ERR(EINVAL);
 424         }
 425         memset(payload, 0, MAX_ARRAY_PACKET * 4);
 426         memcpy(payload, cmdbuf->buf + 4, (count + 1) * 4);
 427
 428         /* carefully check packet contents */
 429
 430         narrays = payload[0];
 431         k = 0;
 432         i = 1;
 433         while ((k < narrays) && (i < (count + 1))) {
 434                 i++;            /* skip attribute field */
 435                 if (!radeon_check_offset(dev_priv, payload[i])) {
 436                         DRM_ERROR
 437                             ("Offset failed range check (k=%d i=%d) while processing 3D_LOAD_VBPNTR packet.\n",
 438                              k, i);
 439                         return DRM_ERR(EINVAL);
 440                 }
 441                 k++;
 442                 i++;
 443                 if (k == narrays)
 444                         break;
 445                 /* have one more to process, they come in pairs */
 446                 if (!radeon_check_offset(dev_priv, payload[i])) {
 447                         DRM_ERROR
 448                             ("Offset failed range check (k=%d i=%d) while processing 3D_LOAD_VBPNTR packet.\n",
 449                              k, i);
 450                         return DRM_ERR(EINVAL);
 451                 }
 452                 k++;
 453                 i++;
 454         }
 455         /* do the counts match what we expect ? */
 456         if ((k != narrays) || (i != (count + 1))) {
 457                 DRM_ERROR
 458                     ("Malformed 3D_LOAD_VBPNTR packet (k=%d i=%d narrays=%d count+1=%d).\n",
 459                      k, i, narrays, count + 1);
 460                 return DRM_ERR(EINVAL);
 461         }
 462
 463         /* all clear, output packet */
 464
 465         BEGIN_RING(count + 2);
 466         OUT_RING(header);
 467         OUT_RING_TABLE(payload, count + 1);
 468         ADVANCE_RING();
 469
 470         cmdbuf->buf += (count + 2) * 4;
 471         cmdbuf->bufsz -= (count + 2) * 4;
 472
 473         return 0;
 474 }
 475
 476 static __inline__ int r300_emit_bitblt_multi(drm_radeon_private_t *dev_priv,
 477                                              drm_radeon_kcmd_buffer_t *cmdbuf)
 478 {
 479         u32 *cmd = (u32 *) cmdbuf->buf;
 480         int count, ret;
 481         RING_LOCALS;
 482
 483         count=(cmd[0]>>16) & 0x3fff;
 484
 485         if (cmd[0] & 0x8000) {
 486                 u32 offset;
 487
 488                 if (cmd[1] & (RADEON_GMC_SRC_PITCH_OFFSET_CNTL
 489                               | RADEON_GMC_DST_PITCH_OFFSET_CNTL)) {
 490                         offset = cmd[2] << 10;
 491                         ret = !radeon_check_offset(dev_priv, offset);
 492                         if (ret) {
 493                                 DRM_ERROR("Invalid bitblt first offset is %08X\n", offset);
 494                                 return DRM_ERR(EINVAL);
 495                         }
 496                 }
 497
 498                 if ((cmd[1] & RADEON_GMC_SRC_PITCH_OFFSET_CNTL) &&
 499                     (cmd[1] & RADEON_GMC_DST_PITCH_OFFSET_CNTL)) {
 500                         offset = cmd[3] << 10;
 501                         ret = !radeon_check_offset(dev_priv, offset);
 502                         if (ret) {
 503                                 DRM_ERROR("Invalid bitblt second offset is %08X\n", offset);
 504                                 return DRM_ERR(EINVAL);
 505                         }
 506
 507                 }
 508         }
 509
 510         BEGIN_RING(count+2);
 511         OUT_RING(cmd[0]);
 512         OUT_RING_TABLE((int *)(cmdbuf->buf + 4), count + 1);
 513         ADVANCE_RING();
 514
 515         cmdbuf->buf += (count+2)*4;
 516         cmdbuf->bufsz -= (count+2)*4;
 517
 518         return 0;
 519 }
 520
 521 static __inline__ int r300_emit_indx_buffer(drm_radeon_private_t *dev_priv,
 522                                              drm_radeon_kcmd_buffer_t *cmdbuf)
 523 {
 524         u32 *cmd = (u32 *) cmdbuf->buf;
 525         int count, ret;
 526         RING_LOCALS;
 527
 528         count=(cmd[0]>>16) & 0x3fff;
 529
 530         if ((cmd[1] & 0x8000ffff) != 0x80000810) {
 531                 DRM_ERROR("Invalid indx_buffer reg address %08X\n", cmd[1]);
 532                 return DRM_ERR(EINVAL);
 533         }
 534         ret = !radeon_check_offset(dev_priv, cmd[2]);
 535         if (ret) {
 536                 DRM_ERROR("Invalid indx_buffer offset is %08X\n", cmd[2]);
 537                 return DRM_ERR(EINVAL);
 538         }
 539
 540         BEGIN_RING(count+2);
 541         OUT_RING(cmd[0]);
 542         OUT_RING_TABLE((int *)(cmdbuf->buf + 4), count + 1);
 543         ADVANCE_RING();
 544
 545         cmdbuf->buf += (count+2)*4;
 546         cmdbuf->bufsz -= (count+2)*4;
 547
 548         return 0;
 549 }
 550
 551 static __inline__ int r300_emit_raw_packet3(drm_radeon_private_t *dev_priv,
 552                                             drm_radeon_kcmd_buffer_t *cmdbuf)
 553 {
 554         u32 header;
 555         int count;
 556         RING_LOCALS;
 557
 558         if (4 > cmdbuf->bufsz)
 559                 return DRM_ERR(EINVAL);
 560
 561         /* Fixme !! This simply emits a packet without much checking.
 562            We need to be smarter. */
 563
 564         /* obtain first word - actual packet3 header */
 565         header = *(u32 *) cmdbuf->buf;
 566
 567         /* Is it packet 3 ? */
 568         if ((header >> 30) != 0x3) {
 569                 DRM_ERROR("Not a packet3 header (0x%08x)\n", header);
 570                 return DRM_ERR(EINVAL);
 571         }
 572
 573         count = (header >> 16) & 0x3fff;
 574
 575         /* Check again now that we know how much data to expect */
 576         if ((count + 2) * 4 > cmdbuf->bufsz) {
 577                 DRM_ERROR
 578                     ("Expected packet3 of length %d but have only %d bytes left\n",
 579                      (count + 2) * 4, cmdbuf->bufsz);
 580                 return DRM_ERR(EINVAL);
 581         }
 582
 583         /* Is it a packet type we know about ? */
 584         switch (header & 0xff00) {
 585         case RADEON_3D_LOAD_VBPNTR:     /* load vertex array pointers */
 586                 return r300_emit_3d_load_vbpntr(dev_priv, cmdbuf, header);
 587
 588         case RADEON_CNTL_BITBLT_MULTI:
 589                 return r300_emit_bitblt_multi(dev_priv, cmdbuf);
 590
 591         case RADEON_CP_INDX_BUFFER:     /* DRAW_INDX_2 without INDX_BUFFER seems to lock up the gpu */
 592                 return r300_emit_indx_buffer(dev_priv, cmdbuf);
 593         case RADEON_CP_3D_DRAW_IMMD_2:  /* triggers drawing using in-packet vertex data */
 594         case RADEON_CP_3D_DRAW_VBUF_2:  /* triggers drawing of vertex buffers setup elsewhere */
 595         case RADEON_CP_3D_DRAW_INDX_2:  /* triggers drawing using indices to vertex buffer */
 596         case RADEON_WAIT_FOR_IDLE:
 597         case RADEON_CP_NOP:
 598                 /* these packets are safe */
 599                 break;
 600         default:
 601                 DRM_ERROR("Unknown packet3 header (0x%08x)\n", header);
 602                 return DRM_ERR(EINVAL);
 603         }
 604
 605         BEGIN_RING(count + 2);
 606         OUT_RING(header);
 607         OUT_RING_TABLE((int *)(cmdbuf->buf + 4), count + 1);
 608         ADVANCE_RING();
 609
 610         cmdbuf->buf += (count + 2) * 4;
 611         cmdbuf->bufsz -= (count + 2) * 4;
 612
 613         return 0;
 614 }
 615
 616 /**
 617  * Emit a rendering packet3 from userspace.
 618  * Called by r300_do_cp_cmdbuf.
 619  */
 620 static __inline__ int r300_emit_packet3(drm_radeon_private_t *dev_priv,
 621                                         drm_radeon_kcmd_buffer_t *cmdbuf,
 622                                         drm_r300_cmd_header_t header)
 623 {
 624         int n;
 625         int ret;
 626         char *orig_buf = cmdbuf->buf;
 627         int orig_bufsz = cmdbuf->bufsz;
 628
 629         /* This is a do-while-loop so that we run the interior at least once,
 630          * even if cmdbuf->nbox is 0. Compare r300_emit_cliprects for rationale.
 631          */
 632         n = 0;
 633         do {
 634                 if (cmdbuf->nbox > R300_SIMULTANEOUS_CLIPRECTS) {
 635                         ret = r300_emit_cliprects(dev_priv, cmdbuf, n);
 636                         if (ret)
 637                                 return ret;
 638
 639                         cmdbuf->buf = orig_buf;
 640                         cmdbuf->bufsz = orig_bufsz;
 641                 }
 642
 643                 switch (header.packet3.packet) {
 644                 case R300_CMD_PACKET3_CLEAR:
 645                         DRM_DEBUG("R300_CMD_PACKET3_CLEAR\n");
 646                         ret = r300_emit_clear(dev_priv, cmdbuf);
 647                         if (ret) {
 648                                 DRM_ERROR("r300_emit_clear failed\n");
 649                                 return ret;
 650                         }
 651                         break;
 652
 653                 case R300_CMD_PACKET3_RAW:
 654                         DRM_DEBUG("R300_CMD_PACKET3_RAW\n");
 655                         ret = r300_emit_raw_packet3(dev_priv, cmdbuf);
 656                         if (ret) {
 657                                 DRM_ERROR("r300_emit_raw_packet3 failed\n");
 658                                 return ret;
 659                         }
 660                         break;
 661
 662                 default:
 663                         DRM_ERROR("bad packet3 type %i at %p\n",
 664                                   header.packet3.packet,
 665                                   cmdbuf->buf - sizeof(header));
 666                         return DRM_ERR(EINVAL);
 667                 }
 668
 669                 n += R300_SIMULTANEOUS_CLIPRECTS;
 670         } while (n < cmdbuf->nbox);
 671
 672         return 0;
 673 }
 674
 675 /* Some of the R300 chips seem to be extremely touchy about the two registers
 676  * that are configured in r300_pacify.
 677  * Among the worst offenders seems to be the R300 ND (0x4E44): When userspace
 678  * sends a command buffer that contains only state setting commands and a
 679  * vertex program/parameter upload sequence, this will eventually lead to a
 680  * lockup, unless the sequence is bracketed by calls to r300_pacify.
 681  * So we should take great care to *always* call r300_pacify before
 682  * *anything* 3D related, and again afterwards. This is what the
 683  * call bracket in r300_do_cp_cmdbuf is for.
 684  */
 685
 686 /**
 687  * Emit the sequence to pacify R300.
 688  */
 689 static __inline__ void r300_pacify(drm_radeon_private_t *dev_priv)
 690 {
 691         RING_LOCALS;
 692
 693         BEGIN_RING(6);
 694         OUT_RING(CP_PACKET0(R300_RB3D_DSTCACHE_CTLSTAT, 0));
 695         OUT_RING(0xa);
 696         OUT_RING(CP_PACKET0(0x4f18, 0));
 697         OUT_RING(0x3);
 698         OUT_RING(CP_PACKET3(RADEON_CP_NOP, 0));
 699         OUT_RING(0x0);
 700         ADVANCE_RING();
 701 }
 702
 703 /**
 704  * Called by r300_do_cp_cmdbuf to update the internal buffer age and state.
 705  * The actual age emit is done by r300_do_cp_cmdbuf, which is why you must
 706  * be careful about how this function is called.
 707  */
 708 static void r300_discard_buffer(drm_device_t * dev, drm_buf_t * buf)
 709 {
 710         drm_radeon_private_t *dev_priv = dev->dev_private;
 711         drm_radeon_buf_priv_t *buf_priv = buf->dev_private;
 712
 713         buf_priv->age = ++dev_priv->sarea_priv->last_dispatch;
 714         buf->pending = 1;
 715         buf->used = 0;
 716 }
 717
 718 static int r300_scratch(drm_radeon_private_t *dev_priv,
 719                         drm_radeon_kcmd_buffer_t *cmdbuf,
 720                         drm_r300_cmd_header_t header)
 721 {
 722         u32 *ref_age_base;
 723         u32 i, buf_idx, h_pending;
 724         RING_LOCALS;
 725
 726         if (cmdbuf->bufsz <
 727             (sizeof(u64) + header.scratch.n_bufs * sizeof(buf_idx))) {
 728                 return DRM_ERR(EINVAL);
 729         }
 730
 731         if (header.scratch.reg >= 5) {
 732                 return DRM_ERR(EINVAL);
 733         }
 734
 735         dev_priv->scratch_ages[header.scratch.reg]++;
 736
 737         ref_age_base =  (u32 *)(unsigned long)*((uint64_t *)cmdbuf->buf);
 738
 739         cmdbuf->buf += sizeof(u64);
 740         cmdbuf->bufsz -= sizeof(u64);
 741
 742         for (i=0; i < header.scratch.n_bufs; i++) {
 743                 buf_idx = *(u32 *)cmdbuf->buf;
 744                 buf_idx *= 2; /* 8 bytes per buf */
 745
 746                 if (DRM_COPY_TO_USER(ref_age_base + buf_idx, &dev_priv->scratch_ages[header.scratch.reg], sizeof(u32))) {
 747                         return DRM_ERR(EINVAL);
 748                 }
 749
 750                 if (DRM_COPY_FROM_USER(&h_pending, ref_age_base + buf_idx + 1, sizeof(u32))) {
 751                         return DRM_ERR(EINVAL);
 752                 }
 753
 754                 if (h_pending == 0) {
 755                         return DRM_ERR(EINVAL);
 756                 }
 757
 758                 h_pending--;
 759
 760                 if (DRM_COPY_TO_USER(ref_age_base + buf_idx + 1, &h_pending, sizeof(u32))) {
 761                         return DRM_ERR(EINVAL);
 762                 }
 763
 764                 cmdbuf->buf += sizeof(buf_idx);
 765                 cmdbuf->bufsz -= sizeof(buf_idx);
 766         }
 767
 768         BEGIN_RING(2);
 769         OUT_RING(CP_PACKET0(RADEON_SCRATCH_REG0 + header.scratch.reg * 4, 0));
 770         OUT_RING(dev_priv->scratch_ages[header.scratch.reg]);
 771         ADVANCE_RING();
 772
 773         return 0;
 774 }
 775
 776 /**
 777  * Parses and validates a user-supplied command buffer and emits appropriate
 778  * commands on the DMA ring buffer.
 779  * Called by the ioctl handler function radeon_cp_cmdbuf.
 780  */
 781 int r300_do_cp_cmdbuf(drm_device_t *dev,
 782                       DRMFILE filp,
 783                       drm_file_t *filp_priv,
 784                       drm_radeon_kcmd_buffer_t *cmdbuf)
 785 {
 786         drm_radeon_private_t *dev_priv = dev->dev_private;
 787         drm_device_dma_t *dma = dev->dma;
 788         drm_buf_t *buf = NULL;
 789         int emit_dispatch_age = 0;
 790         int ret = 0;
 791
 792         DRM_DEBUG("\n");
 793
 794         /* See the comment above r300_emit_begin3d for why this call must be here,
 795          * and what the cleanup gotos are for. */
 796         r300_pacify(dev_priv);
 797
 798         if (cmdbuf->nbox <= R300_SIMULTANEOUS_CLIPRECTS) {
 799                 ret = r300_emit_cliprects(dev_priv, cmdbuf, 0);
 800                 if (ret)
 801                         goto cleanup;
 802         }
 803
 804         while (cmdbuf->bufsz >= sizeof(drm_r300_cmd_header_t)) {
 805                 int idx;
 806                 drm_r300_cmd_header_t header;
 807
 808                 header.u = *(unsigned int *)cmdbuf->buf;
 809
 810                 cmdbuf->buf += sizeof(header);
 811                 cmdbuf->bufsz -= sizeof(header);
 812
 813                 switch (header.header.cmd_type) {
 814                 case R300_CMD_PACKET0:
 815                         DRM_DEBUG("R300_CMD_PACKET0\n");
 816                         ret = r300_emit_packet0(dev_priv, cmdbuf, header);
 817                         if (ret) {
 818                                 DRM_ERROR("r300_emit_packet0 failed\n");
 819                                 goto cleanup;
 820                         }
 821                         break;
 822
 823                 case R300_CMD_VPU:
 824                         DRM_DEBUG("R300_CMD_VPU\n");
 825                         ret = r300_emit_vpu(dev_priv, cmdbuf, header);
 826                         if (ret) {
 827                                 DRM_ERROR("r300_emit_vpu failed\n");
 828                                 goto cleanup;
 829                         }
 830                         break;
 831
 832                 case R300_CMD_PACKET3:
 833                         DRM_DEBUG("R300_CMD_PACKET3\n");
 834                         ret = r300_emit_packet3(dev_priv, cmdbuf, header);
 835                         if (ret) {
 836                                 DRM_ERROR("r300_emit_packet3 failed\n");
 837                                 goto cleanup;
 838                         }
 839                         break;
 840
 841                 case R300_CMD_END3D:
 842                         DRM_DEBUG("R300_CMD_END3D\n");
 843                         /* TODO:
 844                            Ideally userspace driver should not need to issue this call,
 845                            i.e. the drm driver should issue it automatically and prevent
 846                            lockups.
 847
 848                            In practice, we do not understand why this call is needed and what
 849                            it does (except for some vague guesses that it has to do with cache
 850                            coherence) and so the user space driver does it.
 851
 852                            Once we are sure which uses prevent lockups the code could be moved
 853                            into the kernel and the userspace driver will not
 854                            need to use this command.
 855
 856                            Note that issuing this command does not hurt anything
 857                            except, possibly, performance */
 858                         r300_pacify(dev_priv);
 859                         break;
 860
 861                 case R300_CMD_CP_DELAY:
 862                         /* simple enough, we can do it here */
 863                         DRM_DEBUG("R300_CMD_CP_DELAY\n");
 864                         {
 865                                 int i;
 866                                 RING_LOCALS;
 867
 868                                 BEGIN_RING(header.delay.count);
 869                                 for (i = 0; i < header.delay.count; i++)
 870                                         OUT_RING(RADEON_CP_PACKET2);
 871                                 ADVANCE_RING();
 872                         }
 873                         break;
 874
 875                 case R300_CMD_DMA_DISCARD:
 876                         DRM_DEBUG("RADEON_CMD_DMA_DISCARD\n");
 877                         idx = header.dma.buf_idx;
 878                         if (idx < 0 || idx >= dma->buf_count) {
 879                                 DRM_ERROR("buffer index %d (of %d max)\n",
 880                                           idx, dma->buf_count - 1);
 881                                 ret = DRM_ERR(EINVAL);
 882                                 goto cleanup;
 883                         }
 884
 885                         buf = dma->buflist[idx];
 886                         if (buf->filp != filp || buf->pending) {
 887                                 DRM_ERROR("bad buffer %p %p %d\n",
 888                                           buf->filp, filp, buf->pending);
 889                                 ret = DRM_ERR(EINVAL);
 890                                 goto cleanup;
 891                         }
 892
 893                         emit_dispatch_age = 1;
 894                         r300_discard_buffer(dev, buf);
 895                         break;
 896
 897                 case R300_CMD_WAIT:
 898                         /* simple enough, we can do it here */
 899                         DRM_DEBUG("R300_CMD_WAIT\n");
 900                         if (header.wait.flags == 0)
 901                                 break;  /* nothing to do */
 902
 903                         {
 904                                 RING_LOCALS;
 905
 906                                 BEGIN_RING(2);
 907                                 OUT_RING(CP_PACKET0(RADEON_WAIT_UNTIL, 0));
 908                                 OUT_RING((header.wait.flags & 0xf) << 14);
 909                                 ADVANCE_RING();
 910                         }
 911                         break;
 912
 913                 case R300_CMD_SCRATCH:
 914                         DRM_DEBUG("R300_CMD_SCRATCH\n");
 915                         ret = r300_scratch(dev_priv, cmdbuf, header);
 916                         if (ret) {
 917                                 DRM_ERROR("r300_scratch failed\n");
 918                                 goto cleanup;
 919                         }
 920                         break;
 921
 922                 default:
 923                         DRM_ERROR("bad cmd_type %i at %p\n",
 924                                   header.header.cmd_type,
 925                                   cmdbuf->buf - sizeof(header));
 926                         ret = DRM_ERR(EINVAL);
 927                         goto cleanup;
 928                 }
 929         }
 930
 931         DRM_DEBUG("END\n");
 932
 933       cleanup:
 934         r300_pacify(dev_priv);
 935
 936         /* We emit the vertex buffer age here, outside the pacifier "brackets"
 937          * for two reasons:
 938          *  (1) This may coalesce multiple age emissions into a single one and
 939          *  (2) more importantly, some chips lock up hard when scratch registers
 940          *      are written inside the pacifier bracket.
 941          */
 942         if (emit_dispatch_age) {
 943                 RING_LOCALS;
 944
 945                 /* Emit the vertex buffer age */
 946                 BEGIN_RING(2);
 947                 RADEON_DISPATCH_AGE(dev_priv->sarea_priv->last_dispatch);
 948                 ADVANCE_RING();
 949         }
 950
 951         COMMIT_RING();
 952
 953         return ret;
 954 }