1 /* 2 * Copyright © 2013 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Brad Volkin <bradley.d.volkin@intel.com> 25 * 26 */ 27 28 #include "i915_drv.h" 29 30 /** 31 * DOC: batch buffer command parser 32 * 33 * Motivation: 34 * Certain OpenGL features (e.g. transform feedback, performance monitoring) 35 * require userspace code to submit batches containing commands such as 36 * MI_LOAD_REGISTER_IMM to access various registers. Unfortunately, some 37 * generations of the hardware will noop these commands in "unsecure" batches 38 * (which includes all userspace batches submitted via i915) even though the 39 * commands may be safe and represent the intended programming model of the 40 * device. 41 * 42 * The software command parser is similar in operation to the command parsing 43 * done in hardware for unsecure batches. However, the software parser allows 44 * some operations that would be noop'd by hardware, if the parser determines 45 * the operation is safe, and submits the batch as "secure" to prevent hardware 46 * parsing. 47 * 48 * Threats: 49 * At a high level, the hardware (and software) checks attempt to prevent 50 * granting userspace undue privileges. There are three categories of privilege. 51 * 52 * First, commands which are explicitly defined as privileged or which should 53 * only be used by the kernel driver. The parser generally rejects such 54 * commands, though it may allow some from the drm master process. 55 * 56 * Second, commands which access registers. To support correct/enhanced 57 * userspace functionality, particularly certain OpenGL extensions, the parser 58 * provides a whitelist of registers which userspace may safely access (for both 59 * normal and drm master processes). 60 * 61 * Third, commands which access privileged memory (i.e. GGTT, HWS page, etc). 62 * The parser always rejects such commands. 63 * 64 * The majority of the problematic commands fall in the MI_* range, with only a 65 * few specific commands on each engine (e.g. PIPE_CONTROL and MI_FLUSH_DW). 66 * 67 * Implementation: 68 * Each engine maintains tables of commands and registers which the parser 69 * uses in scanning batch buffers submitted to that engine. 70 * 71 * Since the set of commands that the parser must check for is significantly 72 * smaller than the number of commands supported, the parser tables contain only 73 * those commands required by the parser. This generally works because command 74 * opcode ranges have standard command length encodings. So for commands that 75 * the parser does not need to check, it can easily skip them. This is 76 * implemented via a per-engine length decoding vfunc. 77 * 78 * Unfortunately, there are a number of commands that do not follow the standard 79 * length encoding for their opcode range, primarily amongst the MI_* commands. 80 * To handle this, the parser provides a way to define explicit "skip" entries 81 * in the per-engine command tables. 82 * 83 * Other command table entries map fairly directly to high level categories 84 * mentioned above: rejected, master-only, register whitelist. The parser 85 * implements a number of checks, including the privileged memory checks, via a 86 * general bitmasking mechanism. 87 */ 88 89 /* 90 * A command that requires special handling by the command parser. 91 */ 92 struct drm_i915_cmd_descriptor { 93 /* 94 * Flags describing how the command parser processes the command. 95 * 96 * CMD_DESC_FIXED: The command has a fixed length if this is set, 97 * a length mask if not set 98 * CMD_DESC_SKIP: The command is allowed but does not follow the 99 * standard length encoding for the opcode range in 100 * which it falls 101 * CMD_DESC_REJECT: The command is never allowed 102 * CMD_DESC_REGISTER: The command should be checked against the 103 * register whitelist for the appropriate ring 104 * CMD_DESC_MASTER: The command is allowed if the submitting process 105 * is the DRM master 106 */ 107 u32 flags; 108 #define CMD_DESC_FIXED (1<<0) 109 #define CMD_DESC_SKIP (1<<1) 110 #define CMD_DESC_REJECT (1<<2) 111 #define CMD_DESC_REGISTER (1<<3) 112 #define CMD_DESC_BITMASK (1<<4) 113 #define CMD_DESC_MASTER (1<<5) 114 115 /* 116 * The command's unique identification bits and the bitmask to get them. 117 * This isn't strictly the opcode field as defined in the spec and may 118 * also include type, subtype, and/or subop fields. 119 */ 120 struct { 121 u32 value; 122 u32 mask; 123 } cmd; 124 125 /* 126 * The command's length. The command is either fixed length (i.e. does 127 * not include a length field) or has a length field mask. The flag 128 * CMD_DESC_FIXED indicates a fixed length. Otherwise, the command has 129 * a length mask. All command entries in a command table must include 130 * length information. 131 */ 132 union { 133 u32 fixed; 134 u32 mask; 135 } length; 136 137 /* 138 * Describes where to find a register address in the command to check 139 * against the ring's register whitelist. Only valid if flags has the 140 * CMD_DESC_REGISTER bit set. 141 * 142 * A non-zero step value implies that the command may access multiple 143 * registers in sequence (e.g. LRI), in that case step gives the 144 * distance in dwords between individual offset fields. 145 */ 146 struct { 147 u32 offset; 148 u32 mask; 149 u32 step; 150 } reg; 151 152 #define MAX_CMD_DESC_BITMASKS 3 153 /* 154 * Describes command checks where a particular dword is masked and 155 * compared against an expected value. If the command does not match 156 * the expected value, the parser rejects it. Only valid if flags has 157 * the CMD_DESC_BITMASK bit set. Only entries where mask is non-zero 158 * are valid. 159 * 160 * If the check specifies a non-zero condition_mask then the parser 161 * only performs the check when the bits specified by condition_mask 162 * are non-zero. 163 */ 164 struct { 165 u32 offset; 166 u32 mask; 167 u32 expected; 168 u32 condition_offset; 169 u32 condition_mask; 170 } bits[MAX_CMD_DESC_BITMASKS]; 171 }; 172 173 /* 174 * A table of commands requiring special handling by the command parser. 175 * 176 * Each engine has an array of tables. Each table consists of an array of 177 * command descriptors, which must be sorted with command opcodes in 178 * ascending order. 179 */ 180 struct drm_i915_cmd_table { 181 const struct drm_i915_cmd_descriptor *table; 182 int count; 183 }; 184 185 #define STD_MI_OPCODE_SHIFT (32 - 9) 186 #define STD_3D_OPCODE_SHIFT (32 - 16) 187 #define STD_2D_OPCODE_SHIFT (32 - 10) 188 #define STD_MFX_OPCODE_SHIFT (32 - 16) 189 #define MIN_OPCODE_SHIFT 16 190 191 #define CMD(op, opm, f, lm, fl, ...) \ 192 { \ 193 .flags = (fl) | ((f) ? CMD_DESC_FIXED : 0), \ 194 .cmd = { (op), ~0u << (opm) }, \ 195 .length = { (lm) }, \ 196 __VA_ARGS__ \ 197 } 198 199 /* Convenience macros to compress the tables */ 200 #define SMI STD_MI_OPCODE_SHIFT 201 #define S3D STD_3D_OPCODE_SHIFT 202 #define S2D STD_2D_OPCODE_SHIFT 203 #define SMFX STD_MFX_OPCODE_SHIFT 204 #define F true 205 #define S CMD_DESC_SKIP 206 #define R CMD_DESC_REJECT 207 #define W CMD_DESC_REGISTER 208 #define B CMD_DESC_BITMASK 209 #define M CMD_DESC_MASTER 210 211 /* Command Mask Fixed Len Action 212 ---------------------------------------------------------- */ 213 static const struct drm_i915_cmd_descriptor common_cmds[] = { 214 CMD( MI_NOOP, SMI, F, 1, S ), 215 CMD( MI_USER_INTERRUPT, SMI, F, 1, R ), 216 CMD( MI_WAIT_FOR_EVENT, SMI, F, 1, M ), 217 CMD( MI_ARB_CHECK, SMI, F, 1, S ), 218 CMD( MI_REPORT_HEAD, SMI, F, 1, S ), 219 CMD( MI_SUSPEND_FLUSH, SMI, F, 1, S ), 220 CMD( MI_SEMAPHORE_MBOX, SMI, !F, 0xFF, R ), 221 CMD( MI_STORE_DWORD_INDEX, SMI, !F, 0xFF, R ), 222 CMD( MI_LOAD_REGISTER_IMM(1), SMI, !F, 0xFF, W, 223 .reg = { .offset = 1, .mask = 0x007FFFFC, .step = 2 } ), 224 CMD( MI_STORE_REGISTER_MEM, SMI, F, 3, W | B, 225 .reg = { .offset = 1, .mask = 0x007FFFFC }, 226 .bits = {{ 227 .offset = 0, 228 .mask = MI_GLOBAL_GTT, 229 .expected = 0, 230 }}, ), 231 CMD( MI_LOAD_REGISTER_MEM, SMI, F, 3, W | B, 232 .reg = { .offset = 1, .mask = 0x007FFFFC }, 233 .bits = {{ 234 .offset = 0, 235 .mask = MI_GLOBAL_GTT, 236 .expected = 0, 237 }}, ), 238 /* 239 * MI_BATCH_BUFFER_START requires some special handling. It's not 240 * really a 'skip' action but it doesn't seem like it's worth adding 241 * a new action. See i915_parse_cmds(). 242 */ 243 CMD( MI_BATCH_BUFFER_START, SMI, !F, 0xFF, S ), 244 }; 245 246 static const struct drm_i915_cmd_descriptor render_cmds[] = { 247 CMD( MI_FLUSH, SMI, F, 1, S ), 248 CMD( MI_ARB_ON_OFF, SMI, F, 1, R ), 249 CMD( MI_PREDICATE, SMI, F, 1, S ), 250 CMD( MI_TOPOLOGY_FILTER, SMI, F, 1, S ), 251 CMD( MI_SET_APPID, SMI, F, 1, S ), 252 CMD( MI_DISPLAY_FLIP, SMI, !F, 0xFF, R ), 253 CMD( MI_SET_CONTEXT, SMI, !F, 0xFF, R ), 254 CMD( MI_URB_CLEAR, SMI, !F, 0xFF, S ), 255 CMD( MI_STORE_DWORD_IMM, SMI, !F, 0x3F, B, 256 .bits = {{ 257 .offset = 0, 258 .mask = MI_GLOBAL_GTT, 259 .expected = 0, 260 }}, ), 261 CMD( MI_UPDATE_GTT, SMI, !F, 0xFF, R ), 262 CMD( MI_CLFLUSH, SMI, !F, 0x3FF, B, 263 .bits = {{ 264 .offset = 0, 265 .mask = MI_GLOBAL_GTT, 266 .expected = 0, 267 }}, ), 268 CMD( MI_REPORT_PERF_COUNT, SMI, !F, 0x3F, B, 269 .bits = {{ 270 .offset = 1, 271 .mask = MI_REPORT_PERF_COUNT_GGTT, 272 .expected = 0, 273 }}, ), 274 CMD( MI_CONDITIONAL_BATCH_BUFFER_END, SMI, !F, 0xFF, B, 275 .bits = {{ 276 .offset = 0, 277 .mask = MI_GLOBAL_GTT, 278 .expected = 0, 279 }}, ), 280 CMD( GFX_OP_3DSTATE_VF_STATISTICS, S3D, F, 1, S ), 281 CMD( PIPELINE_SELECT, S3D, F, 1, S ), 282 CMD( MEDIA_VFE_STATE, S3D, !F, 0xFFFF, B, 283 .bits = {{ 284 .offset = 2, 285 .mask = MEDIA_VFE_STATE_MMIO_ACCESS_MASK, 286 .expected = 0, 287 }}, ), 288 CMD( GPGPU_OBJECT, S3D, !F, 0xFF, S ), 289 CMD( GPGPU_WALKER, S3D, !F, 0xFF, S ), 290 CMD( GFX_OP_3DSTATE_SO_DECL_LIST, S3D, !F, 0x1FF, S ), 291 CMD( GFX_OP_PIPE_CONTROL(5), S3D, !F, 0xFF, B, 292 .bits = {{ 293 .offset = 1, 294 .mask = (PIPE_CONTROL_MMIO_WRITE | PIPE_CONTROL_NOTIFY), 295 .expected = 0, 296 }, 297 { 298 .offset = 1, 299 .mask = (PIPE_CONTROL_GLOBAL_GTT_IVB | 300 PIPE_CONTROL_STORE_DATA_INDEX), 301 .expected = 0, 302 .condition_offset = 1, 303 .condition_mask = PIPE_CONTROL_POST_SYNC_OP_MASK, 304 }}, ), 305 }; 306 307 static const struct drm_i915_cmd_descriptor hsw_render_cmds[] = { 308 CMD( MI_SET_PREDICATE, SMI, F, 1, S ), 309 CMD( MI_RS_CONTROL, SMI, F, 1, S ), 310 CMD( MI_URB_ATOMIC_ALLOC, SMI, F, 1, S ), 311 CMD( MI_SET_APPID, SMI, F, 1, S ), 312 CMD( MI_RS_CONTEXT, SMI, F, 1, S ), 313 CMD( MI_LOAD_SCAN_LINES_INCL, SMI, !F, 0x3F, M ), 314 CMD( MI_LOAD_SCAN_LINES_EXCL, SMI, !F, 0x3F, R ), 315 CMD( MI_LOAD_REGISTER_REG, SMI, !F, 0xFF, W, 316 .reg = { .offset = 1, .mask = 0x007FFFFC, .step = 1 } ), 317 CMD( MI_RS_STORE_DATA_IMM, SMI, !F, 0xFF, S ), 318 CMD( MI_LOAD_URB_MEM, SMI, !F, 0xFF, S ), 319 CMD( MI_STORE_URB_MEM, SMI, !F, 0xFF, S ), 320 CMD( GFX_OP_3DSTATE_DX9_CONSTANTF_VS, S3D, !F, 0x7FF, S ), 321 CMD( GFX_OP_3DSTATE_DX9_CONSTANTF_PS, S3D, !F, 0x7FF, S ), 322 323 CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_VS, S3D, !F, 0x1FF, S ), 324 CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_GS, S3D, !F, 0x1FF, S ), 325 CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_HS, S3D, !F, 0x1FF, S ), 326 CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_DS, S3D, !F, 0x1FF, S ), 327 CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_PS, S3D, !F, 0x1FF, S ), 328 }; 329 330 static const struct drm_i915_cmd_descriptor video_cmds[] = { 331 CMD( MI_ARB_ON_OFF, SMI, F, 1, R ), 332 CMD( MI_SET_APPID, SMI, F, 1, S ), 333 CMD( MI_STORE_DWORD_IMM, SMI, !F, 0xFF, B, 334 .bits = {{ 335 .offset = 0, 336 .mask = MI_GLOBAL_GTT, 337 .expected = 0, 338 }}, ), 339 CMD( MI_UPDATE_GTT, SMI, !F, 0x3F, R ), 340 CMD( MI_FLUSH_DW, SMI, !F, 0x3F, B, 341 .bits = {{ 342 .offset = 0, 343 .mask = MI_FLUSH_DW_NOTIFY, 344 .expected = 0, 345 }, 346 { 347 .offset = 1, 348 .mask = MI_FLUSH_DW_USE_GTT, 349 .expected = 0, 350 .condition_offset = 0, 351 .condition_mask = MI_FLUSH_DW_OP_MASK, 352 }, 353 { 354 .offset = 0, 355 .mask = MI_FLUSH_DW_STORE_INDEX, 356 .expected = 0, 357 .condition_offset = 0, 358 .condition_mask = MI_FLUSH_DW_OP_MASK, 359 }}, ), 360 CMD( MI_CONDITIONAL_BATCH_BUFFER_END, SMI, !F, 0xFF, B, 361 .bits = {{ 362 .offset = 0, 363 .mask = MI_GLOBAL_GTT, 364 .expected = 0, 365 }}, ), 366 /* 367 * MFX_WAIT doesn't fit the way we handle length for most commands. 368 * It has a length field but it uses a non-standard length bias. 369 * It is always 1 dword though, so just treat it as fixed length. 370 */ 371 CMD( MFX_WAIT, SMFX, F, 1, S ), 372 }; 373 374 static const struct drm_i915_cmd_descriptor vecs_cmds[] = { 375 CMD( MI_ARB_ON_OFF, SMI, F, 1, R ), 376 CMD( MI_SET_APPID, SMI, F, 1, S ), 377 CMD( MI_STORE_DWORD_IMM, SMI, !F, 0xFF, B, 378 .bits = {{ 379 .offset = 0, 380 .mask = MI_GLOBAL_GTT, 381 .expected = 0, 382 }}, ), 383 CMD( MI_UPDATE_GTT, SMI, !F, 0x3F, R ), 384 CMD( MI_FLUSH_DW, SMI, !F, 0x3F, B, 385 .bits = {{ 386 .offset = 0, 387 .mask = MI_FLUSH_DW_NOTIFY, 388 .expected = 0, 389 }, 390 { 391 .offset = 1, 392 .mask = MI_FLUSH_DW_USE_GTT, 393 .expected = 0, 394 .condition_offset = 0, 395 .condition_mask = MI_FLUSH_DW_OP_MASK, 396 }, 397 { 398 .offset = 0, 399 .mask = MI_FLUSH_DW_STORE_INDEX, 400 .expected = 0, 401 .condition_offset = 0, 402 .condition_mask = MI_FLUSH_DW_OP_MASK, 403 }}, ), 404 CMD( MI_CONDITIONAL_BATCH_BUFFER_END, SMI, !F, 0xFF, B, 405 .bits = {{ 406 .offset = 0, 407 .mask = MI_GLOBAL_GTT, 408 .expected = 0, 409 }}, ), 410 }; 411 412 static const struct drm_i915_cmd_descriptor blt_cmds[] = { 413 CMD( MI_DISPLAY_FLIP, SMI, !F, 0xFF, R ), 414 CMD( MI_STORE_DWORD_IMM, SMI, !F, 0x3FF, B, 415 .bits = {{ 416 .offset = 0, 417 .mask = MI_GLOBAL_GTT, 418 .expected = 0, 419 }}, ), 420 CMD( MI_UPDATE_GTT, SMI, !F, 0x3F, R ), 421 CMD( MI_FLUSH_DW, SMI, !F, 0x3F, B, 422 .bits = {{ 423 .offset = 0, 424 .mask = MI_FLUSH_DW_NOTIFY, 425 .expected = 0, 426 }, 427 { 428 .offset = 1, 429 .mask = MI_FLUSH_DW_USE_GTT, 430 .expected = 0, 431 .condition_offset = 0, 432 .condition_mask = MI_FLUSH_DW_OP_MASK, 433 }, 434 { 435 .offset = 0, 436 .mask = MI_FLUSH_DW_STORE_INDEX, 437 .expected = 0, 438 .condition_offset = 0, 439 .condition_mask = MI_FLUSH_DW_OP_MASK, 440 }}, ), 441 CMD( COLOR_BLT, S2D, !F, 0x3F, S ), 442 CMD( SRC_COPY_BLT, S2D, !F, 0x3F, S ), 443 }; 444 445 static const struct drm_i915_cmd_descriptor hsw_blt_cmds[] = { 446 CMD( MI_LOAD_SCAN_LINES_INCL, SMI, !F, 0x3F, M ), 447 CMD( MI_LOAD_SCAN_LINES_EXCL, SMI, !F, 0x3F, R ), 448 }; 449 450 static const struct drm_i915_cmd_descriptor noop_desc = 451 CMD(MI_NOOP, SMI, F, 1, S); 452 453 #undef CMD 454 #undef SMI 455 #undef S3D 456 #undef S2D 457 #undef SMFX 458 #undef F 459 #undef S 460 #undef R 461 #undef W 462 #undef B 463 #undef M 464 465 static const struct drm_i915_cmd_table gen7_render_cmds[] = { 466 { common_cmds, ARRAY_SIZE(common_cmds) }, 467 { render_cmds, ARRAY_SIZE(render_cmds) }, 468 }; 469 470 static const struct drm_i915_cmd_table hsw_render_ring_cmds[] = { 471 { common_cmds, ARRAY_SIZE(common_cmds) }, 472 { render_cmds, ARRAY_SIZE(render_cmds) }, 473 { hsw_render_cmds, ARRAY_SIZE(hsw_render_cmds) }, 474 }; 475 476 static const struct drm_i915_cmd_table gen7_video_cmds[] = { 477 { common_cmds, ARRAY_SIZE(common_cmds) }, 478 { video_cmds, ARRAY_SIZE(video_cmds) }, 479 }; 480 481 static const struct drm_i915_cmd_table hsw_vebox_cmds[] = { 482 { common_cmds, ARRAY_SIZE(common_cmds) }, 483 { vecs_cmds, ARRAY_SIZE(vecs_cmds) }, 484 }; 485 486 static const struct drm_i915_cmd_table gen7_blt_cmds[] = { 487 { common_cmds, ARRAY_SIZE(common_cmds) }, 488 { blt_cmds, ARRAY_SIZE(blt_cmds) }, 489 }; 490 491 static const struct drm_i915_cmd_table hsw_blt_ring_cmds[] = { 492 { common_cmds, ARRAY_SIZE(common_cmds) }, 493 { blt_cmds, ARRAY_SIZE(blt_cmds) }, 494 { hsw_blt_cmds, ARRAY_SIZE(hsw_blt_cmds) }, 495 }; 496 497 /* 498 * Register whitelists, sorted by increasing register offset. 499 */ 500 501 /* 502 * An individual whitelist entry granting access to register addr. If 503 * mask is non-zero the argument of immediate register writes will be 504 * AND-ed with mask, and the command will be rejected if the result 505 * doesn't match value. 506 * 507 * Registers with non-zero mask are only allowed to be written using 508 * LRI. 509 */ 510 struct drm_i915_reg_descriptor { 511 i915_reg_t addr; 512 u32 mask; 513 u32 value; 514 }; 515 516 /* Convenience macro for adding 32-bit registers. */ 517 #define REG32(_reg, ...) \ 518 { .addr = (_reg), __VA_ARGS__ } 519 520 /* 521 * Convenience macro for adding 64-bit registers. 522 * 523 * Some registers that userspace accesses are 64 bits. The register 524 * access commands only allow 32-bit accesses. Hence, we have to include 525 * entries for both halves of the 64-bit registers. 526 */ 527 #define REG64(_reg) \ 528 { .addr = _reg }, \ 529 { .addr = _reg ## _UDW } 530 531 #define REG64_IDX(_reg, idx) \ 532 { .addr = _reg(idx) }, \ 533 { .addr = _reg ## _UDW(idx) } 534 535 static const struct drm_i915_reg_descriptor gen7_render_regs[] = { 536 REG64(GPGPU_THREADS_DISPATCHED), 537 REG64(HS_INVOCATION_COUNT), 538 REG64(DS_INVOCATION_COUNT), 539 REG64(IA_VERTICES_COUNT), 540 REG64(IA_PRIMITIVES_COUNT), 541 REG64(VS_INVOCATION_COUNT), 542 REG64(GS_INVOCATION_COUNT), 543 REG64(GS_PRIMITIVES_COUNT), 544 REG64(CL_INVOCATION_COUNT), 545 REG64(CL_PRIMITIVES_COUNT), 546 REG64(PS_INVOCATION_COUNT), 547 REG64(PS_DEPTH_COUNT), 548 REG64_IDX(RING_TIMESTAMP, RENDER_RING_BASE), 549 REG64(MI_PREDICATE_SRC0), 550 REG64(MI_PREDICATE_SRC1), 551 REG32(GEN7_3DPRIM_END_OFFSET), 552 REG32(GEN7_3DPRIM_START_VERTEX), 553 REG32(GEN7_3DPRIM_VERTEX_COUNT), 554 REG32(GEN7_3DPRIM_INSTANCE_COUNT), 555 REG32(GEN7_3DPRIM_START_INSTANCE), 556 REG32(GEN7_3DPRIM_BASE_VERTEX), 557 REG32(GEN7_GPGPU_DISPATCHDIMX), 558 REG32(GEN7_GPGPU_DISPATCHDIMY), 559 REG32(GEN7_GPGPU_DISPATCHDIMZ), 560 REG64_IDX(RING_TIMESTAMP, BSD_RING_BASE), 561 REG64_IDX(GEN7_SO_NUM_PRIMS_WRITTEN, 0), 562 REG64_IDX(GEN7_SO_NUM_PRIMS_WRITTEN, 1), 563 REG64_IDX(GEN7_SO_NUM_PRIMS_WRITTEN, 2), 564 REG64_IDX(GEN7_SO_NUM_PRIMS_WRITTEN, 3), 565 REG64_IDX(GEN7_SO_PRIM_STORAGE_NEEDED, 0), 566 REG64_IDX(GEN7_SO_PRIM_STORAGE_NEEDED, 1), 567 REG64_IDX(GEN7_SO_PRIM_STORAGE_NEEDED, 2), 568 REG64_IDX(GEN7_SO_PRIM_STORAGE_NEEDED, 3), 569 REG32(GEN7_SO_WRITE_OFFSET(0)), 570 REG32(GEN7_SO_WRITE_OFFSET(1)), 571 REG32(GEN7_SO_WRITE_OFFSET(2)), 572 REG32(GEN7_SO_WRITE_OFFSET(3)), 573 REG32(GEN7_L3SQCREG1), 574 REG32(GEN7_L3CNTLREG2), 575 REG32(GEN7_L3CNTLREG3), 576 REG64_IDX(RING_TIMESTAMP, BLT_RING_BASE), 577 }; 578 579 static const struct drm_i915_reg_descriptor hsw_render_regs[] = { 580 REG64_IDX(HSW_CS_GPR, 0), 581 REG64_IDX(HSW_CS_GPR, 1), 582 REG64_IDX(HSW_CS_GPR, 2), 583 REG64_IDX(HSW_CS_GPR, 3), 584 REG64_IDX(HSW_CS_GPR, 4), 585 REG64_IDX(HSW_CS_GPR, 5), 586 REG64_IDX(HSW_CS_GPR, 6), 587 REG64_IDX(HSW_CS_GPR, 7), 588 REG64_IDX(HSW_CS_GPR, 8), 589 REG64_IDX(HSW_CS_GPR, 9), 590 REG64_IDX(HSW_CS_GPR, 10), 591 REG64_IDX(HSW_CS_GPR, 11), 592 REG64_IDX(HSW_CS_GPR, 12), 593 REG64_IDX(HSW_CS_GPR, 13), 594 REG64_IDX(HSW_CS_GPR, 14), 595 REG64_IDX(HSW_CS_GPR, 15), 596 REG32(HSW_SCRATCH1, 597 .mask = ~HSW_SCRATCH1_L3_DATA_ATOMICS_DISABLE, 598 .value = 0), 599 REG32(HSW_ROW_CHICKEN3, 600 .mask = ~(HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE << 16 | 601 HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE), 602 .value = 0), 603 }; 604 605 static const struct drm_i915_reg_descriptor gen7_blt_regs[] = { 606 REG64_IDX(RING_TIMESTAMP, RENDER_RING_BASE), 607 REG64_IDX(RING_TIMESTAMP, BSD_RING_BASE), 608 REG32(BCS_SWCTRL), 609 REG64_IDX(RING_TIMESTAMP, BLT_RING_BASE), 610 }; 611 612 static const struct drm_i915_reg_descriptor ivb_master_regs[] = { 613 REG32(FORCEWAKE_MT), 614 REG32(DERRMR), 615 REG32(GEN7_PIPE_DE_LOAD_SL(PIPE_A)), 616 REG32(GEN7_PIPE_DE_LOAD_SL(PIPE_B)), 617 REG32(GEN7_PIPE_DE_LOAD_SL(PIPE_C)), 618 }; 619 620 static const struct drm_i915_reg_descriptor hsw_master_regs[] = { 621 REG32(FORCEWAKE_MT), 622 REG32(DERRMR), 623 }; 624 625 #undef REG64 626 #undef REG32 627 628 struct drm_i915_reg_table { 629 const struct drm_i915_reg_descriptor *regs; 630 int num_regs; 631 bool master; 632 }; 633 634 static const struct drm_i915_reg_table ivb_render_reg_tables[] = { 635 { gen7_render_regs, ARRAY_SIZE(gen7_render_regs), false }, 636 { ivb_master_regs, ARRAY_SIZE(ivb_master_regs), true }, 637 }; 638 639 static const struct drm_i915_reg_table ivb_blt_reg_tables[] = { 640 { gen7_blt_regs, ARRAY_SIZE(gen7_blt_regs), false }, 641 { ivb_master_regs, ARRAY_SIZE(ivb_master_regs), true }, 642 }; 643 644 static const struct drm_i915_reg_table hsw_render_reg_tables[] = { 645 { gen7_render_regs, ARRAY_SIZE(gen7_render_regs), false }, 646 { hsw_render_regs, ARRAY_SIZE(hsw_render_regs), false }, 647 { hsw_master_regs, ARRAY_SIZE(hsw_master_regs), true }, 648 }; 649 650 static const struct drm_i915_reg_table hsw_blt_reg_tables[] = { 651 { gen7_blt_regs, ARRAY_SIZE(gen7_blt_regs), false }, 652 { hsw_master_regs, ARRAY_SIZE(hsw_master_regs), true }, 653 }; 654 655 static u32 gen7_render_get_cmd_length_mask(u32 cmd_header) 656 { 657 u32 client = cmd_header >> INSTR_CLIENT_SHIFT; 658 u32 subclient = 659 (cmd_header & INSTR_SUBCLIENT_MASK) >> INSTR_SUBCLIENT_SHIFT; 660 661 if (client == INSTR_MI_CLIENT) 662 return 0x3F; 663 else if (client == INSTR_RC_CLIENT) { 664 if (subclient == INSTR_MEDIA_SUBCLIENT) 665 return 0xFFFF; 666 else 667 return 0xFF; 668 } 669 670 DRM_DEBUG_DRIVER("CMD: Abnormal rcs cmd length! 0x%08X\n", cmd_header); 671 return 0; 672 } 673 674 static u32 gen7_bsd_get_cmd_length_mask(u32 cmd_header) 675 { 676 u32 client = cmd_header >> INSTR_CLIENT_SHIFT; 677 u32 subclient = 678 (cmd_header & INSTR_SUBCLIENT_MASK) >> INSTR_SUBCLIENT_SHIFT; 679 u32 op = (cmd_header & INSTR_26_TO_24_MASK) >> INSTR_26_TO_24_SHIFT; 680 681 if (client == INSTR_MI_CLIENT) 682 return 0x3F; 683 else if (client == INSTR_RC_CLIENT) { 684 if (subclient == INSTR_MEDIA_SUBCLIENT) { 685 if (op == 6) 686 return 0xFFFF; 687 else 688 return 0xFFF; 689 } else 690 return 0xFF; 691 } 692 693 DRM_DEBUG_DRIVER("CMD: Abnormal bsd cmd length! 0x%08X\n", cmd_header); 694 return 0; 695 } 696 697 static u32 gen7_blt_get_cmd_length_mask(u32 cmd_header) 698 { 699 u32 client = cmd_header >> INSTR_CLIENT_SHIFT; 700 701 if (client == INSTR_MI_CLIENT) 702 return 0x3F; 703 else if (client == INSTR_BC_CLIENT) 704 return 0xFF; 705 706 DRM_DEBUG_DRIVER("CMD: Abnormal blt cmd length! 0x%08X\n", cmd_header); 707 return 0; 708 } 709 710 static bool validate_cmds_sorted(const struct intel_engine_cs *engine, 711 const struct drm_i915_cmd_table *cmd_tables, 712 int cmd_table_count) 713 { 714 int i; 715 bool ret = true; 716 717 if (!cmd_tables || cmd_table_count == 0) 718 return true; 719 720 for (i = 0; i < cmd_table_count; i++) { 721 const struct drm_i915_cmd_table *table = &cmd_tables[i]; 722 u32 previous = 0; 723 int j; 724 725 for (j = 0; j < table->count; j++) { 726 const struct drm_i915_cmd_descriptor *desc = 727 &table->table[j]; 728 u32 curr = desc->cmd.value & desc->cmd.mask; 729 730 if (curr < previous) { 731 DRM_ERROR("CMD: %s [%d] command table not sorted: " 732 "table=%d entry=%d cmd=0x%08X prev=0x%08X\n", 733 engine->name, engine->id, 734 i, j, curr, previous); 735 ret = false; 736 } 737 738 previous = curr; 739 } 740 } 741 742 return ret; 743 } 744 745 static bool check_sorted(const struct intel_engine_cs *engine, 746 const struct drm_i915_reg_descriptor *reg_table, 747 int reg_count) 748 { 749 int i; 750 u32 previous = 0; 751 bool ret = true; 752 753 for (i = 0; i < reg_count; i++) { 754 u32 curr = i915_mmio_reg_offset(reg_table[i].addr); 755 756 if (curr < previous) { 757 DRM_ERROR("CMD: %s [%d] register table not sorted: " 758 "entry=%d reg=0x%08X prev=0x%08X\n", 759 engine->name, engine->id, 760 i, curr, previous); 761 ret = false; 762 } 763 764 previous = curr; 765 } 766 767 return ret; 768 } 769 770 static bool validate_regs_sorted(struct intel_engine_cs *engine) 771 { 772 int i; 773 const struct drm_i915_reg_table *table; 774 775 for (i = 0; i < engine->reg_table_count; i++) { 776 table = &engine->reg_tables[i]; 777 if (!check_sorted(engine, table->regs, table->num_regs)) 778 return false; 779 } 780 781 return true; 782 } 783 784 struct cmd_node { 785 const struct drm_i915_cmd_descriptor *desc; 786 struct hlist_node node; 787 }; 788 789 /* 790 * Different command ranges have different numbers of bits for the opcode. For 791 * example, MI commands use bits 31:23 while 3D commands use bits 31:16. The 792 * problem is that, for example, MI commands use bits 22:16 for other fields 793 * such as GGTT vs PPGTT bits. If we include those bits in the mask then when 794 * we mask a command from a batch it could hash to the wrong bucket due to 795 * non-opcode bits being set. But if we don't include those bits, some 3D 796 * commands may hash to the same bucket due to not including opcode bits that 797 * make the command unique. For now, we will risk hashing to the same bucket. 798 */ 799 static inline u32 cmd_header_key(u32 x) 800 { 801 switch (x >> INSTR_CLIENT_SHIFT) { 802 default: 803 case INSTR_MI_CLIENT: 804 return x >> STD_MI_OPCODE_SHIFT; 805 case INSTR_RC_CLIENT: 806 return x >> STD_3D_OPCODE_SHIFT; 807 case INSTR_BC_CLIENT: 808 return x >> STD_2D_OPCODE_SHIFT; 809 } 810 } 811 812 static int init_hash_table(struct intel_engine_cs *engine, 813 const struct drm_i915_cmd_table *cmd_tables, 814 int cmd_table_count) 815 { 816 int i, j; 817 818 hash_init(engine->cmd_hash); 819 820 for (i = 0; i < cmd_table_count; i++) { 821 const struct drm_i915_cmd_table *table = &cmd_tables[i]; 822 823 for (j = 0; j < table->count; j++) { 824 const struct drm_i915_cmd_descriptor *desc = 825 &table->table[j]; 826 struct cmd_node *desc_node = 827 kmalloc(sizeof(*desc_node), GFP_KERNEL); 828 829 if (!desc_node) 830 return -ENOMEM; 831 832 desc_node->desc = desc; 833 hash_add(engine->cmd_hash, &desc_node->node, 834 cmd_header_key(desc->cmd.value)); 835 } 836 } 837 838 return 0; 839 } 840 841 static void fini_hash_table(struct intel_engine_cs *engine) 842 { 843 struct hlist_node *tmp; 844 struct cmd_node *desc_node; 845 int i; 846 847 hash_for_each_safe(engine->cmd_hash, i, tmp, desc_node, node) { 848 hash_del(&desc_node->node); 849 kfree(desc_node); 850 } 851 } 852 853 /** 854 * intel_engine_init_cmd_parser() - set cmd parser related fields for an engine 855 * @engine: the engine to initialize 856 * 857 * Optionally initializes fields related to batch buffer command parsing in the 858 * struct intel_engine_cs based on whether the platform requires software 859 * command parsing. 860 */ 861 void intel_engine_init_cmd_parser(struct intel_engine_cs *engine) 862 { 863 const struct drm_i915_cmd_table *cmd_tables; 864 int cmd_table_count; 865 int ret; 866 867 if (!IS_GEN7(engine->i915)) 868 return; 869 870 switch (engine->id) { 871 case RCS: 872 if (IS_HASWELL(engine->i915)) { 873 cmd_tables = hsw_render_ring_cmds; 874 cmd_table_count = 875 ARRAY_SIZE(hsw_render_ring_cmds); 876 } else { 877 cmd_tables = gen7_render_cmds; 878 cmd_table_count = ARRAY_SIZE(gen7_render_cmds); 879 } 880 881 if (IS_HASWELL(engine->i915)) { 882 engine->reg_tables = hsw_render_reg_tables; 883 engine->reg_table_count = ARRAY_SIZE(hsw_render_reg_tables); 884 } else { 885 engine->reg_tables = ivb_render_reg_tables; 886 engine->reg_table_count = ARRAY_SIZE(ivb_render_reg_tables); 887 } 888 889 engine->get_cmd_length_mask = gen7_render_get_cmd_length_mask; 890 break; 891 case VCS: 892 cmd_tables = gen7_video_cmds; 893 cmd_table_count = ARRAY_SIZE(gen7_video_cmds); 894 engine->get_cmd_length_mask = gen7_bsd_get_cmd_length_mask; 895 break; 896 case BCS: 897 if (IS_HASWELL(engine->i915)) { 898 cmd_tables = hsw_blt_ring_cmds; 899 cmd_table_count = ARRAY_SIZE(hsw_blt_ring_cmds); 900 } else { 901 cmd_tables = gen7_blt_cmds; 902 cmd_table_count = ARRAY_SIZE(gen7_blt_cmds); 903 } 904 905 if (IS_HASWELL(engine->i915)) { 906 engine->reg_tables = hsw_blt_reg_tables; 907 engine->reg_table_count = ARRAY_SIZE(hsw_blt_reg_tables); 908 } else { 909 engine->reg_tables = ivb_blt_reg_tables; 910 engine->reg_table_count = ARRAY_SIZE(ivb_blt_reg_tables); 911 } 912 913 engine->get_cmd_length_mask = gen7_blt_get_cmd_length_mask; 914 break; 915 case VECS: 916 cmd_tables = hsw_vebox_cmds; 917 cmd_table_count = ARRAY_SIZE(hsw_vebox_cmds); 918 /* VECS can use the same length_mask function as VCS */ 919 engine->get_cmd_length_mask = gen7_bsd_get_cmd_length_mask; 920 break; 921 default: 922 MISSING_CASE(engine->id); 923 return; 924 } 925 926 if (!validate_cmds_sorted(engine, cmd_tables, cmd_table_count)) { 927 DRM_ERROR("%s: command descriptions are not sorted\n", 928 engine->name); 929 return; 930 } 931 if (!validate_regs_sorted(engine)) { 932 DRM_ERROR("%s: registers are not sorted\n", engine->name); 933 return; 934 } 935 936 ret = init_hash_table(engine, cmd_tables, cmd_table_count); 937 if (ret) { 938 DRM_ERROR("%s: initialised failed!\n", engine->name); 939 fini_hash_table(engine); 940 return; 941 } 942 943 engine->needs_cmd_parser = true; 944 } 945 946 /** 947 * intel_engine_cleanup_cmd_parser() - clean up cmd parser related fields 948 * @engine: the engine to clean up 949 * 950 * Releases any resources related to command parsing that may have been 951 * initialized for the specified engine. 952 */ 953 void intel_engine_cleanup_cmd_parser(struct intel_engine_cs *engine) 954 { 955 if (!engine->needs_cmd_parser) 956 return; 957 958 fini_hash_table(engine); 959 } 960 961 static const struct drm_i915_cmd_descriptor* 962 find_cmd_in_table(struct intel_engine_cs *engine, 963 u32 cmd_header) 964 { 965 struct cmd_node *desc_node; 966 967 hash_for_each_possible(engine->cmd_hash, desc_node, node, 968 cmd_header_key(cmd_header)) { 969 const struct drm_i915_cmd_descriptor *desc = desc_node->desc; 970 if (((cmd_header ^ desc->cmd.value) & desc->cmd.mask) == 0) 971 return desc; 972 } 973 974 return NULL; 975 } 976 977 /* 978 * Returns a pointer to a descriptor for the command specified by cmd_header. 979 * 980 * The caller must supply space for a default descriptor via the default_desc 981 * parameter. If no descriptor for the specified command exists in the engine's 982 * command parser tables, this function fills in default_desc based on the 983 * engine's default length encoding and returns default_desc. 984 */ 985 static const struct drm_i915_cmd_descriptor* 986 find_cmd(struct intel_engine_cs *engine, 987 u32 cmd_header, 988 const struct drm_i915_cmd_descriptor *desc, 989 struct drm_i915_cmd_descriptor *default_desc) 990 { 991 u32 mask; 992 993 if (((cmd_header ^ desc->cmd.value) & desc->cmd.mask) == 0) 994 return desc; 995 996 desc = find_cmd_in_table(engine, cmd_header); 997 if (desc) 998 return desc; 999 1000 mask = engine->get_cmd_length_mask(cmd_header); 1001 if (!mask) 1002 return NULL; 1003 1004 default_desc->cmd.value = cmd_header; 1005 default_desc->cmd.mask = ~0u << MIN_OPCODE_SHIFT; 1006 default_desc->length.mask = mask; 1007 default_desc->flags = CMD_DESC_SKIP; 1008 return default_desc; 1009 } 1010 1011 static const struct drm_i915_reg_descriptor * 1012 __find_reg(const struct drm_i915_reg_descriptor *table, int count, u32 addr) 1013 { 1014 int start = 0, end = count; 1015 while (start < end) { 1016 int mid = start + (end - start) / 2; 1017 int ret = addr - i915_mmio_reg_offset(table[mid].addr); 1018 if (ret < 0) 1019 end = mid; 1020 else if (ret > 0) 1021 start = mid + 1; 1022 else 1023 return &table[mid]; 1024 } 1025 return NULL; 1026 } 1027 1028 static const struct drm_i915_reg_descriptor * 1029 find_reg(const struct intel_engine_cs *engine, bool is_master, u32 addr) 1030 { 1031 const struct drm_i915_reg_table *table = engine->reg_tables; 1032 int count = engine->reg_table_count; 1033 1034 do { 1035 if (!table->master || is_master) { 1036 const struct drm_i915_reg_descriptor *reg; 1037 1038 reg = __find_reg(table->regs, table->num_regs, addr); 1039 if (reg != NULL) 1040 return reg; 1041 } 1042 } while (table++, --count); 1043 1044 return NULL; 1045 } 1046 1047 /* Returns a vmap'd pointer to dst_obj, which the caller must unmap */ 1048 static u32 *copy_batch(struct drm_i915_gem_object *dst_obj, 1049 struct drm_i915_gem_object *src_obj, 1050 u32 batch_start_offset, 1051 u32 batch_len, 1052 bool *needs_clflush_after) 1053 { 1054 unsigned int src_needs_clflush; 1055 unsigned int dst_needs_clflush; 1056 void *dst, *src; 1057 int ret; 1058 1059 ret = i915_gem_obj_prepare_shmem_read(src_obj, &src_needs_clflush); 1060 if (ret) 1061 return ERR_PTR(ret); 1062 1063 ret = i915_gem_obj_prepare_shmem_write(dst_obj, &dst_needs_clflush); 1064 if (ret) { 1065 dst = ERR_PTR(ret); 1066 goto unpin_src; 1067 } 1068 1069 dst = i915_gem_object_pin_map(dst_obj, I915_MAP_FORCE_WB); 1070 if (IS_ERR(dst)) 1071 goto unpin_dst; 1072 1073 src = ERR_PTR(-ENODEV); 1074 if (src_needs_clflush && 1075 i915_can_memcpy_from_wc(NULL, batch_start_offset, 0)) { 1076 src = i915_gem_object_pin_map(src_obj, I915_MAP_WC); 1077 if (!IS_ERR(src)) { 1078 i915_memcpy_from_wc(dst, 1079 src + batch_start_offset, 1080 ALIGN(batch_len, 16)); 1081 i915_gem_object_unpin_map(src_obj); 1082 } 1083 } 1084 if (IS_ERR(src)) { 1085 void *ptr; 1086 int offset, n; 1087 1088 offset = offset_in_page(batch_start_offset); 1089 1090 /* We can avoid clflushing partial cachelines before the write 1091 * if we only every write full cache-lines. Since we know that 1092 * both the source and destination are in multiples of 1093 * PAGE_SIZE, we can simply round up to the next cacheline. 1094 * We don't care about copying too much here as we only 1095 * validate up to the end of the batch. 1096 */ 1097 if (dst_needs_clflush & CLFLUSH_BEFORE) 1098 batch_len = roundup(batch_len, 1099 boot_cpu_data.x86_clflush_size); 1100 1101 ptr = dst; 1102 for (n = batch_start_offset >> PAGE_SHIFT; batch_len; n++) { 1103 int len = min_t(int, batch_len, PAGE_SIZE - offset); 1104 1105 src = kmap_atomic(i915_gem_object_get_page(src_obj, n)); 1106 if (src_needs_clflush) 1107 drm_clflush_virt_range(src + offset, len); 1108 memcpy(ptr, src + offset, len); 1109 kunmap_atomic(src); 1110 1111 ptr += len; 1112 batch_len -= len; 1113 offset = 0; 1114 } 1115 } 1116 1117 /* dst_obj is returned with vmap pinned */ 1118 *needs_clflush_after = dst_needs_clflush & CLFLUSH_AFTER; 1119 1120 unpin_dst: 1121 i915_gem_obj_finish_shmem_access(dst_obj); 1122 unpin_src: 1123 i915_gem_obj_finish_shmem_access(src_obj); 1124 return dst; 1125 } 1126 1127 static bool check_cmd(const struct intel_engine_cs *engine, 1128 const struct drm_i915_cmd_descriptor *desc, 1129 const u32 *cmd, u32 length, 1130 const bool is_master) 1131 { 1132 if (desc->flags & CMD_DESC_SKIP) 1133 return true; 1134 1135 if (desc->flags & CMD_DESC_REJECT) { 1136 DRM_DEBUG_DRIVER("CMD: Rejected command: 0x%08X\n", *cmd); 1137 return false; 1138 } 1139 1140 if ((desc->flags & CMD_DESC_MASTER) && !is_master) { 1141 DRM_DEBUG_DRIVER("CMD: Rejected master-only command: 0x%08X\n", 1142 *cmd); 1143 return false; 1144 } 1145 1146 if (desc->flags & CMD_DESC_REGISTER) { 1147 /* 1148 * Get the distance between individual register offset 1149 * fields if the command can perform more than one 1150 * access at a time. 1151 */ 1152 const u32 step = desc->reg.step ? desc->reg.step : length; 1153 u32 offset; 1154 1155 for (offset = desc->reg.offset; offset < length; 1156 offset += step) { 1157 const u32 reg_addr = cmd[offset] & desc->reg.mask; 1158 const struct drm_i915_reg_descriptor *reg = 1159 find_reg(engine, is_master, reg_addr); 1160 1161 if (!reg) { 1162 DRM_DEBUG_DRIVER("CMD: Rejected register 0x%08X in command: 0x%08X (%s)\n", 1163 reg_addr, *cmd, engine->name); 1164 return false; 1165 } 1166 1167 /* 1168 * Check the value written to the register against the 1169 * allowed mask/value pair given in the whitelist entry. 1170 */ 1171 if (reg->mask) { 1172 if (desc->cmd.value == MI_LOAD_REGISTER_MEM) { 1173 DRM_DEBUG_DRIVER("CMD: Rejected LRM to masked register 0x%08X\n", 1174 reg_addr); 1175 return false; 1176 } 1177 1178 if (desc->cmd.value == MI_LOAD_REGISTER_REG) { 1179 DRM_DEBUG_DRIVER("CMD: Rejected LRR to masked register 0x%08X\n", 1180 reg_addr); 1181 return false; 1182 } 1183 1184 if (desc->cmd.value == MI_LOAD_REGISTER_IMM(1) && 1185 (offset + 2 > length || 1186 (cmd[offset + 1] & reg->mask) != reg->value)) { 1187 DRM_DEBUG_DRIVER("CMD: Rejected LRI to masked register 0x%08X\n", 1188 reg_addr); 1189 return false; 1190 } 1191 } 1192 } 1193 } 1194 1195 if (desc->flags & CMD_DESC_BITMASK) { 1196 int i; 1197 1198 for (i = 0; i < MAX_CMD_DESC_BITMASKS; i++) { 1199 u32 dword; 1200 1201 if (desc->bits[i].mask == 0) 1202 break; 1203 1204 if (desc->bits[i].condition_mask != 0) { 1205 u32 offset = 1206 desc->bits[i].condition_offset; 1207 u32 condition = cmd[offset] & 1208 desc->bits[i].condition_mask; 1209 1210 if (condition == 0) 1211 continue; 1212 } 1213 1214 dword = cmd[desc->bits[i].offset] & 1215 desc->bits[i].mask; 1216 1217 if (dword != desc->bits[i].expected) { 1218 DRM_DEBUG_DRIVER("CMD: Rejected command 0x%08X for bitmask 0x%08X (exp=0x%08X act=0x%08X) (%s)\n", 1219 *cmd, 1220 desc->bits[i].mask, 1221 desc->bits[i].expected, 1222 dword, engine->name); 1223 return false; 1224 } 1225 } 1226 } 1227 1228 return true; 1229 } 1230 1231 #define LENGTH_BIAS 2 1232 1233 /** 1234 * i915_parse_cmds() - parse a submitted batch buffer for privilege violations 1235 * @engine: the engine on which the batch is to execute 1236 * @batch_obj: the batch buffer in question 1237 * @shadow_batch_obj: copy of the batch buffer in question 1238 * @batch_start_offset: byte offset in the batch at which execution starts 1239 * @batch_len: length of the commands in batch_obj 1240 * @is_master: is the submitting process the drm master? 1241 * 1242 * Parses the specified batch buffer looking for privilege violations as 1243 * described in the overview. 1244 * 1245 * Return: non-zero if the parser finds violations or otherwise fails; -EACCES 1246 * if the batch appears legal but should use hardware parsing 1247 */ 1248 int intel_engine_cmd_parser(struct intel_engine_cs *engine, 1249 struct drm_i915_gem_object *batch_obj, 1250 struct drm_i915_gem_object *shadow_batch_obj, 1251 u32 batch_start_offset, 1252 u32 batch_len, 1253 bool is_master) 1254 { 1255 u32 *cmd, *batch_end; 1256 struct drm_i915_cmd_descriptor default_desc = noop_desc; 1257 const struct drm_i915_cmd_descriptor *desc = &default_desc; 1258 bool needs_clflush_after = false; 1259 int ret = 0; 1260 1261 cmd = copy_batch(shadow_batch_obj, batch_obj, 1262 batch_start_offset, batch_len, 1263 &needs_clflush_after); 1264 if (IS_ERR(cmd)) { 1265 DRM_DEBUG_DRIVER("CMD: Failed to copy batch\n"); 1266 return PTR_ERR(cmd); 1267 } 1268 1269 /* 1270 * We use the batch length as size because the shadow object is as 1271 * large or larger and copy_batch() will write MI_NOPs to the extra 1272 * space. Parsing should be faster in some cases this way. 1273 */ 1274 batch_end = cmd + (batch_len / sizeof(*batch_end)); 1275 do { 1276 u32 length; 1277 1278 if (*cmd == MI_BATCH_BUFFER_END) { 1279 if (needs_clflush_after) { 1280 void *ptr = page_mask_bits(shadow_batch_obj->mm.mapping); 1281 drm_clflush_virt_range(ptr, 1282 (void *)(cmd + 1) - ptr); 1283 } 1284 break; 1285 } 1286 1287 desc = find_cmd(engine, *cmd, desc, &default_desc); 1288 if (!desc) { 1289 DRM_DEBUG_DRIVER("CMD: Unrecognized command: 0x%08X\n", 1290 *cmd); 1291 ret = -EINVAL; 1292 break; 1293 } 1294 1295 /* 1296 * If the batch buffer contains a chained batch, return an 1297 * error that tells the caller to abort and dispatch the 1298 * workload as a non-secure batch. 1299 */ 1300 if (desc->cmd.value == MI_BATCH_BUFFER_START) { 1301 ret = -EACCES; 1302 break; 1303 } 1304 1305 if (desc->flags & CMD_DESC_FIXED) 1306 length = desc->length.fixed; 1307 else 1308 length = ((*cmd & desc->length.mask) + LENGTH_BIAS); 1309 1310 if ((batch_end - cmd) < length) { 1311 DRM_DEBUG_DRIVER("CMD: Command length exceeds batch length: 0x%08X length=%u batchlen=%td\n", 1312 *cmd, 1313 length, 1314 batch_end - cmd); 1315 ret = -EINVAL; 1316 break; 1317 } 1318 1319 if (!check_cmd(engine, desc, cmd, length, is_master)) { 1320 ret = -EACCES; 1321 break; 1322 } 1323 1324 cmd += length; 1325 if (cmd >= batch_end) { 1326 DRM_DEBUG_DRIVER("CMD: Got to the end of the buffer w/o a BBE cmd!\n"); 1327 ret = -EINVAL; 1328 break; 1329 } 1330 } while (1); 1331 1332 i915_gem_object_unpin_map(shadow_batch_obj); 1333 return ret; 1334 } 1335 1336 /** 1337 * i915_cmd_parser_get_version() - get the cmd parser version number 1338 * @dev_priv: i915 device private 1339 * 1340 * The cmd parser maintains a simple increasing integer version number suitable 1341 * for passing to userspace clients to determine what operations are permitted. 1342 * 1343 * Return: the current version number of the cmd parser 1344 */ 1345 int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv) 1346 { 1347 struct intel_engine_cs *engine; 1348 enum intel_engine_id id; 1349 bool active = false; 1350 1351 /* If the command parser is not enabled, report 0 - unsupported */ 1352 for_each_engine(engine, dev_priv, id) { 1353 if (engine->needs_cmd_parser) { 1354 active = true; 1355 break; 1356 } 1357 } 1358 if (!active) 1359 return 0; 1360 1361 /* 1362 * Command parser version history 1363 * 1364 * 1. Initial version. Checks batches and reports violations, but leaves 1365 * hardware parsing enabled (so does not allow new use cases). 1366 * 2. Allow access to the MI_PREDICATE_SRC0 and 1367 * MI_PREDICATE_SRC1 registers. 1368 * 3. Allow access to the GPGPU_THREADS_DISPATCHED register. 1369 * 4. L3 atomic chicken bits of HSW_SCRATCH1 and HSW_ROW_CHICKEN3. 1370 * 5. GPGPU dispatch compute indirect registers. 1371 * 6. TIMESTAMP register and Haswell CS GPR registers 1372 * 7. Allow MI_LOAD_REGISTER_REG between whitelisted registers. 1373 * 8. Don't report cmd_check() failures as EINVAL errors to userspace; 1374 * rely on the HW to NOOP disallowed commands as it would without 1375 * the parser enabled. 1376 * 9. Don't whitelist or handle oacontrol specially, as ownership 1377 * for oacontrol state is moving to i915-perf. 1378 */ 1379 return 9; 1380 } 1381