1 /* 2 * Copyright © 2008-2010 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 * Eric Anholt <[email protected]> 25 * Zou Nan hai <[email protected]> 26 * Xiang Hai hao<[email protected]> 27 * 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <dev/drm2/drmP.h> 34 #include <dev/drm2/i915/i915_drv.h> 35 #include <dev/drm2/i915/i915_drm.h> 36 #include <dev/drm2/i915/intel_drv.h> 37 #include <sys/sched.h> 38 #include <sys/sf_buf.h> 39 40 /* 41 * 965+ support PIPE_CONTROL commands, which provide finer grained control 42 * over cache flushing. 43 */ 44 struct pipe_control { 45 struct drm_i915_gem_object *obj; 46 volatile u32 *cpu_page; 47 u32 gtt_offset; 48 }; 49 50 static inline int ring_space(struct intel_ring_buffer *ring) 51 { 52 int space = (ring->head & HEAD_ADDR) - (ring->tail + I915_RING_FREE_SPACE); 53 if (space < 0) 54 space += ring->size; 55 return space; 56 } 57 58 static int 59 gen2_render_ring_flush(struct intel_ring_buffer *ring, 60 u32 invalidate_domains, 61 u32 flush_domains) 62 { 63 u32 cmd; 64 int ret; 65 66 cmd = MI_FLUSH; 67 if (((invalidate_domains|flush_domains) & I915_GEM_DOMAIN_RENDER) == 0) 68 cmd |= MI_NO_WRITE_FLUSH; 69 70 if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER) 71 cmd |= MI_READ_FLUSH; 72 73 ret = intel_ring_begin(ring, 2); 74 if (ret) 75 return ret; 76 77 intel_ring_emit(ring, cmd); 78 intel_ring_emit(ring, MI_NOOP); 79 intel_ring_advance(ring); 80 81 return 0; 82 } 83 84 static int 85 gen4_render_ring_flush(struct intel_ring_buffer *ring, 86 u32 invalidate_domains, 87 u32 flush_domains) 88 { 89 struct drm_device *dev = ring->dev; 90 u32 cmd; 91 int ret; 92 93 /* 94 * read/write caches: 95 * 96 * I915_GEM_DOMAIN_RENDER is always invalidated, but is 97 * only flushed if MI_NO_WRITE_FLUSH is unset. On 965, it is 98 * also flushed at 2d versus 3d pipeline switches. 99 * 100 * read-only caches: 101 * 102 * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if 103 * MI_READ_FLUSH is set, and is always flushed on 965. 104 * 105 * I915_GEM_DOMAIN_COMMAND may not exist? 106 * 107 * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is 108 * invalidated when MI_EXE_FLUSH is set. 109 * 110 * I915_GEM_DOMAIN_VERTEX, which exists on 965, is 111 * invalidated with every MI_FLUSH. 112 * 113 * TLBs: 114 * 115 * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND 116 * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and 117 * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER 118 * are flushed at any MI_FLUSH. 119 */ 120 121 cmd = MI_FLUSH | MI_NO_WRITE_FLUSH; 122 if ((invalidate_domains|flush_domains) & I915_GEM_DOMAIN_RENDER) 123 cmd &= ~MI_NO_WRITE_FLUSH; 124 if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION) 125 cmd |= MI_EXE_FLUSH; 126 127 if (invalidate_domains & I915_GEM_DOMAIN_COMMAND && 128 (IS_G4X(dev) || IS_GEN5(dev))) 129 cmd |= MI_INVALIDATE_ISP; 130 131 ret = intel_ring_begin(ring, 2); 132 if (ret) 133 return ret; 134 135 intel_ring_emit(ring, cmd); 136 intel_ring_emit(ring, MI_NOOP); 137 intel_ring_advance(ring); 138 139 return 0; 140 } 141 142 /** 143 * Emits a PIPE_CONTROL with a non-zero post-sync operation, for 144 * implementing two workarounds on gen6. From section 1.4.7.1 145 * "PIPE_CONTROL" of the Sandy Bridge PRM volume 2 part 1: 146 * 147 * [DevSNB-C+{W/A}] Before any depth stall flush (including those 148 * produced by non-pipelined state commands), software needs to first 149 * send a PIPE_CONTROL with no bits set except Post-Sync Operation != 150 * 0. 151 * 152 * [Dev-SNB{W/A}]: Before a PIPE_CONTROL with Write Cache Flush Enable 153 * =1, a PIPE_CONTROL with any non-zero post-sync-op is required. 154 * 155 * And the workaround for these two requires this workaround first: 156 * 157 * [Dev-SNB{W/A}]: Pipe-control with CS-stall bit set must be sent 158 * BEFORE the pipe-control with a post-sync op and no write-cache 159 * flushes. 160 * 161 * And this last workaround is tricky because of the requirements on 162 * that bit. From section 1.4.7.2.3 "Stall" of the Sandy Bridge PRM 163 * volume 2 part 1: 164 * 165 * "1 of the following must also be set: 166 * - Render Target Cache Flush Enable ([12] of DW1) 167 * - Depth Cache Flush Enable ([0] of DW1) 168 * - Stall at Pixel Scoreboard ([1] of DW1) 169 * - Depth Stall ([13] of DW1) 170 * - Post-Sync Operation ([13] of DW1) 171 * - Notify Enable ([8] of DW1)" 172 * 173 * The cache flushes require the workaround flush that triggered this 174 * one, so we can't use it. Depth stall would trigger the same. 175 * Post-sync nonzero is what triggered this second workaround, so we 176 * can't use that one either. Notify enable is IRQs, which aren't 177 * really our business. That leaves only stall at scoreboard. 178 */ 179 static int 180 intel_emit_post_sync_nonzero_flush(struct intel_ring_buffer *ring) 181 { 182 struct pipe_control *pc = ring->private; 183 u32 scratch_addr = pc->gtt_offset + 128; 184 int ret; 185 186 187 ret = intel_ring_begin(ring, 6); 188 if (ret) 189 return ret; 190 191 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5)); 192 intel_ring_emit(ring, PIPE_CONTROL_CS_STALL | 193 PIPE_CONTROL_STALL_AT_SCOREBOARD); 194 intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); /* address */ 195 intel_ring_emit(ring, 0); /* low dword */ 196 intel_ring_emit(ring, 0); /* high dword */ 197 intel_ring_emit(ring, MI_NOOP); 198 intel_ring_advance(ring); 199 200 ret = intel_ring_begin(ring, 6); 201 if (ret) 202 return ret; 203 204 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(5)); 205 intel_ring_emit(ring, PIPE_CONTROL_QW_WRITE); 206 intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); /* address */ 207 intel_ring_emit(ring, 0); 208 intel_ring_emit(ring, 0); 209 intel_ring_emit(ring, MI_NOOP); 210 intel_ring_advance(ring); 211 212 return 0; 213 } 214 215 static int 216 gen6_render_ring_flush(struct intel_ring_buffer *ring, 217 u32 invalidate_domains, u32 flush_domains) 218 { 219 u32 flags = 0; 220 struct pipe_control *pc = ring->private; 221 u32 scratch_addr = pc->gtt_offset + 128; 222 int ret; 223 224 /* Force SNB workarounds for PIPE_CONTROL flushes */ 225 ret = intel_emit_post_sync_nonzero_flush(ring); 226 if (ret) 227 return ret; 228 229 /* Just flush everything. Experiments have shown that reducing the 230 * number of bits based on the write domains has little performance 231 * impact. 232 */ 233 if (flush_domains) { 234 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH; 235 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH; 236 /* 237 * Ensure that any following seqno writes only happen 238 * when the render cache is indeed flushed. 239 */ 240 flags |= PIPE_CONTROL_CS_STALL; 241 } 242 if (invalidate_domains) { 243 flags |= PIPE_CONTROL_TLB_INVALIDATE; 244 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE; 245 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE; 246 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE; 247 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE; 248 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE; 249 /* 250 * TLB invalidate requires a post-sync write. 251 */ 252 flags |= PIPE_CONTROL_QW_WRITE | PIPE_CONTROL_CS_STALL; 253 } 254 255 ret = intel_ring_begin(ring, 4); 256 if (ret) 257 return ret; 258 259 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4)); 260 intel_ring_emit(ring, flags); 261 intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); 262 intel_ring_emit(ring, 0); 263 intel_ring_advance(ring); 264 265 return 0; 266 } 267 268 static int 269 gen7_render_ring_cs_stall_wa(struct intel_ring_buffer *ring) 270 { 271 int ret; 272 273 ret = intel_ring_begin(ring, 4); 274 if (ret) 275 return ret; 276 277 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4)); 278 intel_ring_emit(ring, PIPE_CONTROL_CS_STALL | 279 PIPE_CONTROL_STALL_AT_SCOREBOARD); 280 intel_ring_emit(ring, 0); 281 intel_ring_emit(ring, 0); 282 intel_ring_advance(ring); 283 284 return 0; 285 } 286 287 static int 288 gen7_render_ring_flush(struct intel_ring_buffer *ring, 289 u32 invalidate_domains, u32 flush_domains) 290 { 291 u32 flags = 0; 292 struct pipe_control *pc = ring->private; 293 u32 scratch_addr = pc->gtt_offset + 128; 294 int ret; 295 296 /* 297 * Ensure that any following seqno writes only happen when the render 298 * cache is indeed flushed. 299 * 300 * Workaround: 4th PIPE_CONTROL command (except the ones with only 301 * read-cache invalidate bits set) must have the CS_STALL bit set. We 302 * don't try to be clever and just set it unconditionally. 303 */ 304 flags |= PIPE_CONTROL_CS_STALL; 305 306 /* Just flush everything. Experiments have shown that reducing the 307 * number of bits based on the write domains has little performance 308 * impact. 309 */ 310 if (flush_domains) { 311 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH; 312 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH; 313 } 314 if (invalidate_domains) { 315 flags |= PIPE_CONTROL_TLB_INVALIDATE; 316 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE; 317 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE; 318 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE; 319 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE; 320 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE; 321 /* 322 * TLB invalidate requires a post-sync write. 323 */ 324 flags |= PIPE_CONTROL_QW_WRITE; 325 326 /* Workaround: we must issue a pipe_control with CS-stall bit 327 * set before a pipe_control command that has the state cache 328 * invalidate bit set. */ 329 gen7_render_ring_cs_stall_wa(ring); 330 } 331 332 ret = intel_ring_begin(ring, 4); 333 if (ret) 334 return ret; 335 336 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4)); 337 intel_ring_emit(ring, flags); 338 intel_ring_emit(ring, scratch_addr | PIPE_CONTROL_GLOBAL_GTT); 339 intel_ring_emit(ring, 0); 340 intel_ring_advance(ring); 341 342 return 0; 343 } 344 345 static void ring_write_tail(struct intel_ring_buffer *ring, 346 u32 value) 347 { 348 drm_i915_private_t *dev_priv = ring->dev->dev_private; 349 I915_WRITE_TAIL(ring, value); 350 } 351 352 u32 intel_ring_get_active_head(struct intel_ring_buffer *ring) 353 { 354 drm_i915_private_t *dev_priv = ring->dev->dev_private; 355 u32 acthd_reg = INTEL_INFO(ring->dev)->gen >= 4 ? 356 RING_ACTHD(ring->mmio_base) : ACTHD; 357 358 return I915_READ(acthd_reg); 359 } 360 361 static int init_ring_common(struct intel_ring_buffer *ring) 362 { 363 struct drm_device *dev = ring->dev; 364 drm_i915_private_t *dev_priv = dev->dev_private; 365 struct drm_i915_gem_object *obj = ring->obj; 366 int ret = 0; 367 u32 head; 368 369 if (HAS_FORCE_WAKE(dev)) 370 gen6_gt_force_wake_get(dev_priv); 371 372 /* Stop the ring if it's running. */ 373 I915_WRITE_CTL(ring, 0); 374 I915_WRITE_HEAD(ring, 0); 375 ring->write_tail(ring, 0); 376 377 head = I915_READ_HEAD(ring) & HEAD_ADDR; 378 379 /* G45 ring initialization fails to reset head to zero */ 380 if (head != 0) { 381 DRM_DEBUG_KMS("%s head not reset to zero " 382 "ctl %08x head %08x tail %08x start %08x\n", 383 ring->name, 384 I915_READ_CTL(ring), 385 I915_READ_HEAD(ring), 386 I915_READ_TAIL(ring), 387 I915_READ_START(ring)); 388 389 I915_WRITE_HEAD(ring, 0); 390 391 if (I915_READ_HEAD(ring) & HEAD_ADDR) { 392 DRM_ERROR("failed to set %s head to zero " 393 "ctl %08x head %08x tail %08x start %08x\n", 394 ring->name, 395 I915_READ_CTL(ring), 396 I915_READ_HEAD(ring), 397 I915_READ_TAIL(ring), 398 I915_READ_START(ring)); 399 } 400 } 401 402 /* Initialize the ring. This must happen _after_ we've cleared the ring 403 * registers with the above sequence (the readback of the HEAD registers 404 * also enforces ordering), otherwise the hw might lose the new ring 405 * register values. */ 406 I915_WRITE_START(ring, obj->gtt_offset); 407 I915_WRITE_CTL(ring, 408 ((ring->size - PAGE_SIZE) & RING_NR_PAGES) 409 | RING_VALID); 410 411 /* If the head is still not zero, the ring is dead */ 412 if (wait_for((I915_READ_CTL(ring) & RING_VALID) != 0 && 413 I915_READ_START(ring) == obj->gtt_offset && 414 (I915_READ_HEAD(ring) & HEAD_ADDR) == 0, 50)) { 415 DRM_ERROR("%s initialization failed " 416 "ctl %08x head %08x tail %08x start %08x\n", 417 ring->name, 418 I915_READ_CTL(ring), 419 I915_READ_HEAD(ring), 420 I915_READ_TAIL(ring), 421 I915_READ_START(ring)); 422 ret = -EIO; 423 goto out; 424 } 425 426 if (!drm_core_check_feature(ring->dev, DRIVER_MODESET)) 427 i915_kernel_lost_context(ring->dev); 428 else { 429 ring->head = I915_READ_HEAD(ring); 430 ring->tail = I915_READ_TAIL(ring) & TAIL_ADDR; 431 ring->space = ring_space(ring); 432 ring->last_retired_head = -1; 433 } 434 435 out: 436 if (HAS_FORCE_WAKE(dev)) 437 gen6_gt_force_wake_put(dev_priv); 438 439 return ret; 440 } 441 442 static int 443 init_pipe_control(struct intel_ring_buffer *ring) 444 { 445 struct pipe_control *pc; 446 struct drm_i915_gem_object *obj; 447 int ret; 448 449 if (ring->private) 450 return 0; 451 452 pc = malloc(sizeof(*pc), DRM_I915_GEM, M_WAITOK); 453 if (!pc) 454 return -ENOMEM; 455 456 obj = i915_gem_alloc_object(ring->dev, 4096); 457 if (obj == NULL) { 458 DRM_ERROR("Failed to allocate seqno page\n"); 459 ret = -ENOMEM; 460 goto err; 461 } 462 463 i915_gem_object_set_cache_level(obj, I915_CACHE_LLC); 464 465 ret = i915_gem_object_pin(obj, 4096, true, false); 466 if (ret) 467 goto err_unref; 468 469 pc->gtt_offset = obj->gtt_offset; 470 pc->cpu_page = (uint32_t *)kva_alloc(PAGE_SIZE); 471 if (pc->cpu_page == NULL) 472 goto err_unpin; 473 pmap_qenter((uintptr_t)pc->cpu_page, &obj->pages[0], 1); 474 pmap_invalidate_cache_range((vm_offset_t)pc->cpu_page, 475 (vm_offset_t)pc->cpu_page + PAGE_SIZE, FALSE); 476 477 pc->obj = obj; 478 ring->private = pc; 479 return 0; 480 481 err_unpin: 482 i915_gem_object_unpin(obj); 483 err_unref: 484 drm_gem_object_unreference(&obj->base); 485 err: 486 free(pc, DRM_I915_GEM); 487 return ret; 488 } 489 490 static void 491 cleanup_pipe_control(struct intel_ring_buffer *ring) 492 { 493 struct pipe_control *pc = ring->private; 494 struct drm_i915_gem_object *obj; 495 496 if (!ring->private) 497 return; 498 499 obj = pc->obj; 500 501 pmap_qremove((vm_offset_t)pc->cpu_page, 1); 502 kva_free((uintptr_t)pc->cpu_page, PAGE_SIZE); 503 i915_gem_object_unpin(obj); 504 drm_gem_object_unreference(&obj->base); 505 506 free(pc, DRM_I915_GEM); 507 ring->private = NULL; 508 } 509 510 static int init_render_ring(struct intel_ring_buffer *ring) 511 { 512 struct drm_device *dev = ring->dev; 513 struct drm_i915_private *dev_priv = dev->dev_private; 514 int ret = init_ring_common(ring); 515 516 if (INTEL_INFO(dev)->gen > 3) 517 I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(VS_TIMER_DISPATCH)); 518 519 /* We need to disable the AsyncFlip performance optimisations in order 520 * to use MI_WAIT_FOR_EVENT within the CS. It should already be 521 * programmed to '1' on all products. 522 */ 523 if (INTEL_INFO(dev)->gen >= 6) 524 I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE)); 525 526 /* Required for the hardware to program scanline values for waiting */ 527 if (INTEL_INFO(dev)->gen == 6) 528 I915_WRITE(GFX_MODE, 529 _MASKED_BIT_ENABLE(GFX_TLB_INVALIDATE_ALWAYS)); 530 531 if (IS_GEN7(dev)) 532 I915_WRITE(GFX_MODE_GEN7, 533 _MASKED_BIT_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) | 534 _MASKED_BIT_ENABLE(GFX_REPLAY_MODE)); 535 536 if (INTEL_INFO(dev)->gen >= 5) { 537 ret = init_pipe_control(ring); 538 if (ret) 539 return ret; 540 } 541 542 if (IS_GEN6(dev)) { 543 /* From the Sandybridge PRM, volume 1 part 3, page 24: 544 * "If this bit is set, STCunit will have LRA as replacement 545 * policy. [...] This bit must be reset. LRA replacement 546 * policy is not supported." 547 */ 548 I915_WRITE(CACHE_MODE_0, 549 _MASKED_BIT_DISABLE(CM0_STC_EVICT_DISABLE_LRA_SNB)); 550 551 /* This is not explicitly set for GEN6, so read the register. 552 * see intel_ring_mi_set_context() for why we care. 553 * TODO: consider explicitly setting the bit for GEN5 554 */ 555 ring->itlb_before_ctx_switch = 556 !!(I915_READ(GFX_MODE) & GFX_TLB_INVALIDATE_ALWAYS); 557 } 558 559 if (INTEL_INFO(dev)->gen >= 6) 560 I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING)); 561 562 if (HAS_L3_GPU_CACHE(dev)) 563 I915_WRITE_IMR(ring, ~GEN6_RENDER_L3_PARITY_ERROR); 564 565 return ret; 566 } 567 568 static void render_ring_cleanup(struct intel_ring_buffer *ring) 569 { 570 struct drm_device *dev = ring->dev; 571 572 if (!ring->private) 573 return; 574 575 if (HAS_BROKEN_CS_TLB(dev)) 576 drm_gem_object_unreference(to_gem_object(ring->private)); 577 578 cleanup_pipe_control(ring); 579 } 580 581 static void 582 update_mboxes(struct intel_ring_buffer *ring, 583 u32 mmio_offset) 584 { 585 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1)); 586 intel_ring_emit(ring, mmio_offset); 587 intel_ring_emit(ring, ring->outstanding_lazy_request); 588 } 589 590 /** 591 * gen6_add_request - Update the semaphore mailbox registers 592 * 593 * @ring - ring that is adding a request 594 * @seqno - return seqno stuck into the ring 595 * 596 * Update the mailbox registers in the *other* rings with the current seqno. 597 * This acts like a signal in the canonical semaphore. 598 */ 599 static int 600 gen6_add_request(struct intel_ring_buffer *ring) 601 { 602 u32 mbox1_reg; 603 u32 mbox2_reg; 604 int ret; 605 606 ret = intel_ring_begin(ring, 10); 607 if (ret) 608 return ret; 609 610 mbox1_reg = ring->signal_mbox[0]; 611 mbox2_reg = ring->signal_mbox[1]; 612 613 update_mboxes(ring, mbox1_reg); 614 update_mboxes(ring, mbox2_reg); 615 intel_ring_emit(ring, MI_STORE_DWORD_INDEX); 616 intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT); 617 intel_ring_emit(ring, ring->outstanding_lazy_request); 618 intel_ring_emit(ring, MI_USER_INTERRUPT); 619 intel_ring_advance(ring); 620 621 return 0; 622 } 623 624 /** 625 * intel_ring_sync - sync the waiter to the signaller on seqno 626 * 627 * @waiter - ring that is waiting 628 * @signaller - ring which has, or will signal 629 * @seqno - seqno which the waiter will block on 630 */ 631 static int 632 gen6_ring_sync(struct intel_ring_buffer *waiter, 633 struct intel_ring_buffer *signaller, 634 u32 seqno) 635 { 636 int ret; 637 u32 dw1 = MI_SEMAPHORE_MBOX | 638 MI_SEMAPHORE_COMPARE | 639 MI_SEMAPHORE_REGISTER; 640 641 /* Throughout all of the GEM code, seqno passed implies our current 642 * seqno is >= the last seqno executed. However for hardware the 643 * comparison is strictly greater than. 644 */ 645 seqno -= 1; 646 647 WARN_ON(signaller->semaphore_register[waiter->id] == 648 MI_SEMAPHORE_SYNC_INVALID); 649 650 ret = intel_ring_begin(waiter, 4); 651 if (ret) 652 return ret; 653 654 intel_ring_emit(waiter, 655 dw1 | signaller->semaphore_register[waiter->id]); 656 intel_ring_emit(waiter, seqno); 657 intel_ring_emit(waiter, 0); 658 intel_ring_emit(waiter, MI_NOOP); 659 intel_ring_advance(waiter); 660 661 return 0; 662 } 663 664 #define PIPE_CONTROL_FLUSH(ring__, addr__) \ 665 do { \ 666 intel_ring_emit(ring__, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE | \ 667 PIPE_CONTROL_DEPTH_STALL); \ 668 intel_ring_emit(ring__, (addr__) | PIPE_CONTROL_GLOBAL_GTT); \ 669 intel_ring_emit(ring__, 0); \ 670 intel_ring_emit(ring__, 0); \ 671 } while (0) 672 673 static int 674 pc_render_add_request(struct intel_ring_buffer *ring) 675 { 676 struct pipe_control *pc = ring->private; 677 u32 scratch_addr = pc->gtt_offset + 128; 678 int ret; 679 680 /* For Ironlake, MI_USER_INTERRUPT was deprecated and apparently 681 * incoherent with writes to memory, i.e. completely fubar, 682 * so we need to use PIPE_NOTIFY instead. 683 * 684 * However, we also need to workaround the qword write 685 * incoherence by flushing the 6 PIPE_NOTIFY buffers out to 686 * memory before requesting an interrupt. 687 */ 688 ret = intel_ring_begin(ring, 32); 689 if (ret) 690 return ret; 691 692 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE | 693 PIPE_CONTROL_WRITE_FLUSH | 694 PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE); 695 intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT); 696 intel_ring_emit(ring, ring->outstanding_lazy_request); 697 intel_ring_emit(ring, 0); 698 PIPE_CONTROL_FLUSH(ring, scratch_addr); 699 scratch_addr += 128; /* write to separate cachelines */ 700 PIPE_CONTROL_FLUSH(ring, scratch_addr); 701 scratch_addr += 128; 702 PIPE_CONTROL_FLUSH(ring, scratch_addr); 703 scratch_addr += 128; 704 PIPE_CONTROL_FLUSH(ring, scratch_addr); 705 scratch_addr += 128; 706 PIPE_CONTROL_FLUSH(ring, scratch_addr); 707 scratch_addr += 128; 708 PIPE_CONTROL_FLUSH(ring, scratch_addr); 709 710 intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE | 711 PIPE_CONTROL_WRITE_FLUSH | 712 PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE | 713 PIPE_CONTROL_NOTIFY); 714 intel_ring_emit(ring, pc->gtt_offset | PIPE_CONTROL_GLOBAL_GTT); 715 intel_ring_emit(ring, ring->outstanding_lazy_request); 716 intel_ring_emit(ring, 0); 717 intel_ring_advance(ring); 718 719 return 0; 720 } 721 722 static u32 723 gen6_ring_get_seqno(struct intel_ring_buffer *ring, bool lazy_coherency) 724 { 725 /* Workaround to force correct ordering between irq and seqno writes on 726 * ivb (and maybe also on snb) by reading from a CS register (like 727 * ACTHD) before reading the status page. */ 728 if (!lazy_coherency) 729 intel_ring_get_active_head(ring); 730 return intel_read_status_page(ring, I915_GEM_HWS_INDEX); 731 } 732 733 static u32 734 ring_get_seqno(struct intel_ring_buffer *ring, bool lazy_coherency) 735 { 736 return intel_read_status_page(ring, I915_GEM_HWS_INDEX); 737 } 738 739 static u32 740 pc_render_get_seqno(struct intel_ring_buffer *ring, bool lazy_coherency) 741 { 742 struct pipe_control *pc = ring->private; 743 return pc->cpu_page[0]; 744 } 745 746 static bool 747 gen5_ring_get_irq(struct intel_ring_buffer *ring) 748 { 749 struct drm_device *dev = ring->dev; 750 drm_i915_private_t *dev_priv = dev->dev_private; 751 752 if (!dev->irq_enabled) 753 return false; 754 755 mtx_lock(&dev_priv->irq_lock); 756 if (ring->irq_refcount++ == 0) { 757 dev_priv->gt_irq_mask &= ~ring->irq_enable_mask; 758 I915_WRITE(GTIMR, dev_priv->gt_irq_mask); 759 POSTING_READ(GTIMR); 760 } 761 mtx_unlock(&dev_priv->irq_lock); 762 763 return true; 764 } 765 766 static void 767 gen5_ring_put_irq(struct intel_ring_buffer *ring) 768 { 769 struct drm_device *dev = ring->dev; 770 drm_i915_private_t *dev_priv = dev->dev_private; 771 772 mtx_lock(&dev_priv->irq_lock); 773 if (--ring->irq_refcount == 0) { 774 dev_priv->gt_irq_mask |= ring->irq_enable_mask; 775 I915_WRITE(GTIMR, dev_priv->gt_irq_mask); 776 POSTING_READ(GTIMR); 777 } 778 mtx_unlock(&dev_priv->irq_lock); 779 } 780 781 static bool 782 i9xx_ring_get_irq(struct intel_ring_buffer *ring) 783 { 784 struct drm_device *dev = ring->dev; 785 drm_i915_private_t *dev_priv = dev->dev_private; 786 787 if (!dev->irq_enabled) 788 return false; 789 790 mtx_lock(&dev_priv->irq_lock); 791 if (ring->irq_refcount++ == 0) { 792 dev_priv->irq_mask &= ~ring->irq_enable_mask; 793 I915_WRITE(IMR, dev_priv->irq_mask); 794 POSTING_READ(IMR); 795 } 796 mtx_unlock(&dev_priv->irq_lock); 797 798 return true; 799 } 800 801 static void 802 i9xx_ring_put_irq(struct intel_ring_buffer *ring) 803 { 804 struct drm_device *dev = ring->dev; 805 drm_i915_private_t *dev_priv = dev->dev_private; 806 807 mtx_lock(&dev_priv->irq_lock); 808 if (--ring->irq_refcount == 0) { 809 dev_priv->irq_mask |= ring->irq_enable_mask; 810 I915_WRITE(IMR, dev_priv->irq_mask); 811 POSTING_READ(IMR); 812 } 813 mtx_unlock(&dev_priv->irq_lock); 814 } 815 816 static bool 817 i8xx_ring_get_irq(struct intel_ring_buffer *ring) 818 { 819 struct drm_device *dev = ring->dev; 820 drm_i915_private_t *dev_priv = dev->dev_private; 821 822 if (!dev->irq_enabled) 823 return false; 824 825 mtx_lock(&dev_priv->irq_lock); 826 if (ring->irq_refcount++ == 0) { 827 dev_priv->irq_mask &= ~ring->irq_enable_mask; 828 I915_WRITE16(IMR, dev_priv->irq_mask); 829 POSTING_READ16(IMR); 830 } 831 mtx_unlock(&dev_priv->irq_lock); 832 833 return true; 834 } 835 836 static void 837 i8xx_ring_put_irq(struct intel_ring_buffer *ring) 838 { 839 struct drm_device *dev = ring->dev; 840 drm_i915_private_t *dev_priv = dev->dev_private; 841 842 mtx_lock(&dev_priv->irq_lock); 843 if (--ring->irq_refcount == 0) { 844 dev_priv->irq_mask |= ring->irq_enable_mask; 845 I915_WRITE16(IMR, dev_priv->irq_mask); 846 POSTING_READ16(IMR); 847 } 848 mtx_unlock(&dev_priv->irq_lock); 849 } 850 851 void intel_ring_setup_status_page(struct intel_ring_buffer *ring) 852 { 853 struct drm_device *dev = ring->dev; 854 drm_i915_private_t *dev_priv = ring->dev->dev_private; 855 u32 mmio = 0; 856 857 /* The ring status page addresses are no longer next to the rest of 858 * the ring registers as of gen7. 859 */ 860 if (IS_GEN7(dev)) { 861 switch (ring->id) { 862 case RCS: 863 mmio = RENDER_HWS_PGA_GEN7; 864 break; 865 case BCS: 866 mmio = BLT_HWS_PGA_GEN7; 867 break; 868 case VCS: 869 mmio = BSD_HWS_PGA_GEN7; 870 break; 871 } 872 } else if (IS_GEN6(ring->dev)) { 873 mmio = RING_HWS_PGA_GEN6(ring->mmio_base); 874 } else { 875 mmio = RING_HWS_PGA(ring->mmio_base); 876 } 877 878 I915_WRITE(mmio, (u32)ring->status_page.gfx_addr); 879 POSTING_READ(mmio); 880 } 881 882 static int 883 bsd_ring_flush(struct intel_ring_buffer *ring, 884 u32 invalidate_domains, 885 u32 flush_domains) 886 { 887 int ret; 888 889 ret = intel_ring_begin(ring, 2); 890 if (ret) 891 return ret; 892 893 intel_ring_emit(ring, MI_FLUSH); 894 intel_ring_emit(ring, MI_NOOP); 895 intel_ring_advance(ring); 896 return 0; 897 } 898 899 static int 900 i9xx_add_request(struct intel_ring_buffer *ring) 901 { 902 int ret; 903 904 ret = intel_ring_begin(ring, 4); 905 if (ret) 906 return ret; 907 908 intel_ring_emit(ring, MI_STORE_DWORD_INDEX); 909 intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT); 910 intel_ring_emit(ring, ring->outstanding_lazy_request); 911 intel_ring_emit(ring, MI_USER_INTERRUPT); 912 intel_ring_advance(ring); 913 914 return 0; 915 } 916 917 static bool 918 gen6_ring_get_irq(struct intel_ring_buffer *ring) 919 { 920 struct drm_device *dev = ring->dev; 921 drm_i915_private_t *dev_priv = dev->dev_private; 922 923 if (!dev->irq_enabled) 924 return false; 925 926 /* It looks like we need to prevent the gt from suspending while waiting 927 * for an notifiy irq, otherwise irqs seem to get lost on at least the 928 * blt/bsd rings on ivb. */ 929 gen6_gt_force_wake_get(dev_priv); 930 931 mtx_lock(&dev_priv->irq_lock); 932 if (ring->irq_refcount++ == 0) { 933 if (HAS_L3_GPU_CACHE(dev) && ring->id == RCS) 934 I915_WRITE_IMR(ring, ~(ring->irq_enable_mask | 935 GEN6_RENDER_L3_PARITY_ERROR)); 936 else 937 I915_WRITE_IMR(ring, ~ring->irq_enable_mask); 938 dev_priv->gt_irq_mask &= ~ring->irq_enable_mask; 939 I915_WRITE(GTIMR, dev_priv->gt_irq_mask); 940 POSTING_READ(GTIMR); 941 } 942 mtx_unlock(&dev_priv->irq_lock); 943 944 return true; 945 } 946 947 static void 948 gen6_ring_put_irq(struct intel_ring_buffer *ring) 949 { 950 struct drm_device *dev = ring->dev; 951 drm_i915_private_t *dev_priv = dev->dev_private; 952 953 mtx_lock(&dev_priv->irq_lock); 954 if (--ring->irq_refcount == 0) { 955 if (HAS_L3_GPU_CACHE(dev) && ring->id == RCS) 956 I915_WRITE_IMR(ring, ~GEN6_RENDER_L3_PARITY_ERROR); 957 else 958 I915_WRITE_IMR(ring, ~0); 959 dev_priv->gt_irq_mask |= ring->irq_enable_mask; 960 I915_WRITE(GTIMR, dev_priv->gt_irq_mask); 961 POSTING_READ(GTIMR); 962 } 963 mtx_unlock(&dev_priv->irq_lock); 964 965 gen6_gt_force_wake_put(dev_priv); 966 } 967 968 static int 969 i965_dispatch_execbuffer(struct intel_ring_buffer *ring, 970 u32 offset, u32 length, 971 unsigned flags) 972 { 973 int ret; 974 975 ret = intel_ring_begin(ring, 2); 976 if (ret) 977 return ret; 978 979 intel_ring_emit(ring, 980 MI_BATCH_BUFFER_START | 981 MI_BATCH_GTT | 982 (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE_I965)); 983 intel_ring_emit(ring, offset); 984 intel_ring_advance(ring); 985 986 return 0; 987 } 988 989 /* Just userspace ABI convention to limit the wa batch bo to a resonable size */ 990 #define I830_BATCH_LIMIT (256*1024) 991 static int 992 i830_dispatch_execbuffer(struct intel_ring_buffer *ring, 993 u32 offset, u32 len, 994 unsigned flags) 995 { 996 int ret; 997 998 if (flags & I915_DISPATCH_PINNED) { 999 ret = intel_ring_begin(ring, 4); 1000 if (ret) 1001 return ret; 1002 1003 intel_ring_emit(ring, MI_BATCH_BUFFER); 1004 intel_ring_emit(ring, offset | (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE)); 1005 intel_ring_emit(ring, offset + len - 8); 1006 intel_ring_emit(ring, MI_NOOP); 1007 intel_ring_advance(ring); 1008 } else { 1009 struct drm_i915_gem_object *obj = ring->private; 1010 u32 cs_offset = obj->gtt_offset; 1011 1012 if (len > I830_BATCH_LIMIT) 1013 return -ENOSPC; 1014 1015 ret = intel_ring_begin(ring, 9+3); 1016 if (ret) 1017 return ret; 1018 /* Blit the batch (which has now all relocs applied) to the stable batch 1019 * scratch bo area (so that the CS never stumbles over its tlb 1020 * invalidation bug) ... */ 1021 intel_ring_emit(ring, XY_SRC_COPY_BLT_CMD | 1022 XY_SRC_COPY_BLT_WRITE_ALPHA | 1023 XY_SRC_COPY_BLT_WRITE_RGB); 1024 intel_ring_emit(ring, BLT_DEPTH_32 | BLT_ROP_GXCOPY | 4096); 1025 intel_ring_emit(ring, 0); 1026 intel_ring_emit(ring, (DIV_ROUND_UP(len, 4096) << 16) | 1024); 1027 intel_ring_emit(ring, cs_offset); 1028 intel_ring_emit(ring, 0); 1029 intel_ring_emit(ring, 4096); 1030 intel_ring_emit(ring, offset); 1031 intel_ring_emit(ring, MI_FLUSH); 1032 1033 /* ... and execute it. */ 1034 intel_ring_emit(ring, MI_BATCH_BUFFER); 1035 intel_ring_emit(ring, cs_offset | (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE)); 1036 intel_ring_emit(ring, cs_offset + len - 8); 1037 intel_ring_advance(ring); 1038 } 1039 1040 return 0; 1041 } 1042 1043 static int 1044 i915_dispatch_execbuffer(struct intel_ring_buffer *ring, 1045 u32 offset, u32 len, 1046 unsigned flags) 1047 { 1048 int ret; 1049 1050 ret = intel_ring_begin(ring, 2); 1051 if (ret) 1052 return ret; 1053 1054 intel_ring_emit(ring, MI_BATCH_BUFFER_START | MI_BATCH_GTT); 1055 intel_ring_emit(ring, offset | (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE)); 1056 intel_ring_advance(ring); 1057 1058 return 0; 1059 } 1060 1061 static void cleanup_status_page(struct intel_ring_buffer *ring) 1062 { 1063 struct drm_i915_gem_object *obj; 1064 1065 obj = ring->status_page.obj; 1066 if (obj == NULL) 1067 return; 1068 1069 pmap_qremove((vm_offset_t)ring->status_page.page_addr, 1); 1070 kva_free((vm_offset_t)ring->status_page.page_addr, 1071 PAGE_SIZE); 1072 i915_gem_object_unpin(obj); 1073 drm_gem_object_unreference(&obj->base); 1074 ring->status_page.obj = NULL; 1075 } 1076 1077 static int init_status_page(struct intel_ring_buffer *ring) 1078 { 1079 struct drm_device *dev = ring->dev; 1080 struct drm_i915_gem_object *obj; 1081 int ret; 1082 1083 obj = i915_gem_alloc_object(dev, 4096); 1084 if (obj == NULL) { 1085 DRM_ERROR("Failed to allocate status page\n"); 1086 ret = -ENOMEM; 1087 goto err; 1088 } 1089 1090 i915_gem_object_set_cache_level(obj, I915_CACHE_LLC); 1091 1092 ret = i915_gem_object_pin(obj, 4096, true, false); 1093 if (ret != 0) { 1094 goto err_unref; 1095 } 1096 1097 ring->status_page.gfx_addr = obj->gtt_offset; 1098 ring->status_page.page_addr = (void *)kva_alloc(PAGE_SIZE); 1099 if (ring->status_page.page_addr == NULL) { 1100 ret = -ENOMEM; 1101 goto err_unpin; 1102 } 1103 pmap_qenter((vm_offset_t)ring->status_page.page_addr, &obj->pages[0], 1104 1); 1105 pmap_invalidate_cache_range((vm_offset_t)ring->status_page.page_addr, 1106 (vm_offset_t)ring->status_page.page_addr + PAGE_SIZE, FALSE); 1107 ring->status_page.obj = obj; 1108 memset(ring->status_page.page_addr, 0, PAGE_SIZE); 1109 1110 intel_ring_setup_status_page(ring); 1111 DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n", 1112 ring->name, ring->status_page.gfx_addr); 1113 1114 return 0; 1115 1116 err_unpin: 1117 i915_gem_object_unpin(obj); 1118 err_unref: 1119 drm_gem_object_unreference(&obj->base); 1120 err: 1121 return ret; 1122 } 1123 1124 static int init_phys_hws_pga(struct intel_ring_buffer *ring) 1125 { 1126 struct drm_i915_private *dev_priv = ring->dev->dev_private; 1127 u32 addr; 1128 1129 if (!dev_priv->status_page_dmah) { 1130 dev_priv->status_page_dmah = 1131 drm_pci_alloc(ring->dev, PAGE_SIZE, PAGE_SIZE, BUS_SPACE_MAXADDR); 1132 if (!dev_priv->status_page_dmah) 1133 return -ENOMEM; 1134 } 1135 1136 addr = dev_priv->status_page_dmah->busaddr; 1137 if (INTEL_INFO(ring->dev)->gen >= 4) 1138 addr |= (dev_priv->status_page_dmah->busaddr >> 28) & 0xf0; 1139 I915_WRITE(HWS_PGA, addr); 1140 1141 ring->status_page.page_addr = dev_priv->status_page_dmah->vaddr; 1142 memset(ring->status_page.page_addr, 0, PAGE_SIZE); 1143 1144 return 0; 1145 } 1146 1147 static int intel_init_ring_buffer(struct drm_device *dev, 1148 struct intel_ring_buffer *ring) 1149 { 1150 struct drm_i915_gem_object *obj; 1151 struct drm_i915_private *dev_priv = dev->dev_private; 1152 int ret; 1153 1154 ring->dev = dev; 1155 INIT_LIST_HEAD(&ring->active_list); 1156 INIT_LIST_HEAD(&ring->request_list); 1157 ring->size = 32 * PAGE_SIZE; 1158 memset(ring->sync_seqno, 0, sizeof(ring->sync_seqno)); 1159 1160 #ifdef __linux__ 1161 init_waitqueue_head(&ring->irq_queue); 1162 #endif 1163 1164 if (I915_NEED_GFX_HWS(dev)) { 1165 ret = init_status_page(ring); 1166 if (ret) 1167 return ret; 1168 } else { 1169 BUG_ON(ring->id != RCS); 1170 ret = init_phys_hws_pga(ring); 1171 if (ret) 1172 return ret; 1173 } 1174 1175 obj = i915_gem_alloc_object(dev, ring->size); 1176 if (obj == NULL) { 1177 DRM_ERROR("Failed to allocate ringbuffer\n"); 1178 ret = -ENOMEM; 1179 goto err_hws; 1180 } 1181 1182 ring->obj = obj; 1183 1184 ret = i915_gem_object_pin(obj, PAGE_SIZE, true, false); 1185 if (ret) 1186 goto err_unref; 1187 1188 ret = i915_gem_object_set_to_gtt_domain(obj, true); 1189 if (ret) 1190 goto err_unpin; 1191 1192 ring->virtual_start = 1193 pmap_mapdev_attr( 1194 dev_priv->mm.gtt->gma_bus_addr + obj->gtt_offset, ring->size, 1195 VM_MEMATTR_WRITE_COMBINING); 1196 if (ring->virtual_start == NULL) { 1197 DRM_ERROR("Failed to map ringbuffer.\n"); 1198 ret = -EINVAL; 1199 goto err_unpin; 1200 } 1201 1202 ret = ring->init(ring); 1203 if (ret) 1204 goto err_unmap; 1205 1206 /* Workaround an erratum on the i830 which causes a hang if 1207 * the TAIL pointer points to within the last 2 cachelines 1208 * of the buffer. 1209 */ 1210 ring->effective_size = ring->size; 1211 if (IS_I830(ring->dev) || IS_845G(ring->dev)) 1212 ring->effective_size -= 128; 1213 1214 return 0; 1215 1216 err_unmap: 1217 pmap_unmapdev((vm_offset_t)ring->virtual_start, ring->size); 1218 err_unpin: 1219 i915_gem_object_unpin(obj); 1220 err_unref: 1221 drm_gem_object_unreference(&obj->base); 1222 ring->obj = NULL; 1223 err_hws: 1224 cleanup_status_page(ring); 1225 return ret; 1226 } 1227 1228 void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring) 1229 { 1230 struct drm_i915_private *dev_priv; 1231 int ret; 1232 1233 if (ring->obj == NULL) 1234 return; 1235 1236 /* Disable the ring buffer. The ring must be idle at this point */ 1237 dev_priv = ring->dev->dev_private; 1238 ret = intel_ring_idle(ring); 1239 if (ret) 1240 DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n", 1241 ring->name, ret); 1242 1243 I915_WRITE_CTL(ring, 0); 1244 1245 pmap_unmapdev((vm_offset_t)ring->virtual_start, ring->size); 1246 1247 i915_gem_object_unpin(ring->obj); 1248 drm_gem_object_unreference(&ring->obj->base); 1249 ring->obj = NULL; 1250 1251 if (ring->cleanup) 1252 ring->cleanup(ring); 1253 1254 cleanup_status_page(ring); 1255 } 1256 1257 static int intel_ring_wait_seqno(struct intel_ring_buffer *ring, u32 seqno) 1258 { 1259 int ret; 1260 1261 ret = i915_wait_seqno(ring, seqno); 1262 if (!ret) 1263 i915_gem_retire_requests_ring(ring); 1264 1265 return ret; 1266 } 1267 1268 static int intel_ring_wait_request(struct intel_ring_buffer *ring, int n) 1269 { 1270 struct drm_i915_gem_request *request; 1271 u32 seqno = 0; 1272 int ret; 1273 1274 i915_gem_retire_requests_ring(ring); 1275 1276 if (ring->last_retired_head != -1) { 1277 ring->head = ring->last_retired_head; 1278 ring->last_retired_head = -1; 1279 ring->space = ring_space(ring); 1280 if (ring->space >= n) 1281 return 0; 1282 } 1283 1284 list_for_each_entry(request, &ring->request_list, list) { 1285 int space; 1286 1287 if (request->tail == -1) 1288 continue; 1289 1290 space = request->tail - (ring->tail + I915_RING_FREE_SPACE); 1291 if (space < 0) 1292 space += ring->size; 1293 if (space >= n) { 1294 seqno = request->seqno; 1295 break; 1296 } 1297 1298 /* Consume this request in case we need more space than 1299 * is available and so need to prevent a race between 1300 * updating last_retired_head and direct reads of 1301 * I915_RING_HEAD. It also provides a nice sanity check. 1302 */ 1303 request->tail = -1; 1304 } 1305 1306 if (seqno == 0) 1307 return -ENOSPC; 1308 1309 ret = intel_ring_wait_seqno(ring, seqno); 1310 if (ret) 1311 return ret; 1312 1313 if (WARN_ON(ring->last_retired_head == -1)) 1314 return -ENOSPC; 1315 1316 ring->head = ring->last_retired_head; 1317 ring->last_retired_head = -1; 1318 ring->space = ring_space(ring); 1319 if (WARN_ON(ring->space < n)) 1320 return -ENOSPC; 1321 1322 return 0; 1323 } 1324 1325 static int ring_wait_for_space(struct intel_ring_buffer *ring, int n) 1326 { 1327 struct drm_device *dev = ring->dev; 1328 struct drm_i915_private *dev_priv = dev->dev_private; 1329 unsigned long end; 1330 int ret; 1331 1332 ret = intel_ring_wait_request(ring, n); 1333 if (ret != -ENOSPC) 1334 return ret; 1335 1336 CTR1(KTR_DRM, "ring_wait_begin %s", ring->name); 1337 /* With GEM the hangcheck timer should kick us out of the loop, 1338 * leaving it early runs the risk of corrupting GEM state (due 1339 * to running on almost untested codepaths). But on resume 1340 * timers don't work yet, so prevent a complete hang in that 1341 * case by choosing an insanely large timeout. */ 1342 end = jiffies + 60 * HZ; 1343 1344 do { 1345 ring->head = I915_READ_HEAD(ring); 1346 ring->space = ring_space(ring); 1347 if (ring->space >= n) { 1348 CTR1(KTR_DRM, "ring_wait_end %s", ring->name); 1349 return 0; 1350 } 1351 1352 if (dev->primary->master) { 1353 struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv; 1354 if (master_priv->sarea_priv) 1355 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT; 1356 } 1357 1358 DRM_MSLEEP(1); 1359 1360 ret = i915_gem_check_wedge(dev_priv, dev_priv->mm.interruptible); 1361 if (ret) { 1362 CTR1(KTR_DRM, "ring_wait_end %s wedged", ring->name); 1363 return ret; 1364 } 1365 } while (!time_after(jiffies, end)); 1366 CTR1(KTR_DRM, "ring_wait_end %s busy", ring->name); 1367 return -EBUSY; 1368 } 1369 1370 static int intel_wrap_ring_buffer(struct intel_ring_buffer *ring) 1371 { 1372 uint32_t __iomem *virt; 1373 int rem = ring->size - ring->tail; 1374 1375 if (ring->space < rem) { 1376 int ret = ring_wait_for_space(ring, rem); 1377 if (ret) 1378 return ret; 1379 } 1380 1381 virt = (uint32_t *)((char *)ring->virtual_start + ring->tail); 1382 rem /= 4; 1383 while (rem--) 1384 iowrite32(MI_NOOP, virt++); 1385 1386 ring->tail = 0; 1387 ring->space = ring_space(ring); 1388 1389 return 0; 1390 } 1391 1392 int intel_ring_idle(struct intel_ring_buffer *ring) 1393 { 1394 u32 seqno; 1395 int ret; 1396 1397 /* We need to add any requests required to flush the objects and ring */ 1398 if (ring->outstanding_lazy_request) { 1399 ret = i915_add_request(ring, NULL, NULL); 1400 if (ret) 1401 return ret; 1402 } 1403 1404 /* Wait upon the last request to be completed */ 1405 if (list_empty(&ring->request_list)) 1406 return 0; 1407 1408 seqno = list_entry(ring->request_list.prev, 1409 struct drm_i915_gem_request, 1410 list)->seqno; 1411 1412 return i915_wait_seqno(ring, seqno); 1413 } 1414 1415 static int 1416 intel_ring_alloc_seqno(struct intel_ring_buffer *ring) 1417 { 1418 if (ring->outstanding_lazy_request) 1419 return 0; 1420 1421 return i915_gem_get_seqno(ring->dev, &ring->outstanding_lazy_request); 1422 } 1423 1424 int intel_ring_begin(struct intel_ring_buffer *ring, 1425 int num_dwords) 1426 { 1427 drm_i915_private_t *dev_priv = ring->dev->dev_private; 1428 int n = 4*num_dwords; 1429 int ret; 1430 1431 ret = i915_gem_check_wedge(dev_priv, dev_priv->mm.interruptible); 1432 if (ret) 1433 return ret; 1434 1435 /* Preallocate the olr before touching the ring */ 1436 ret = intel_ring_alloc_seqno(ring); 1437 if (ret) 1438 return ret; 1439 1440 if (unlikely(ring->tail + n > ring->effective_size)) { 1441 ret = intel_wrap_ring_buffer(ring); 1442 if (unlikely(ret)) 1443 return ret; 1444 } 1445 1446 if (unlikely(ring->space < n)) { 1447 ret = ring_wait_for_space(ring, n); 1448 if (unlikely(ret)) 1449 return ret; 1450 } 1451 1452 ring->space -= n; 1453 return 0; 1454 } 1455 1456 void intel_ring_advance(struct intel_ring_buffer *ring) 1457 { 1458 struct drm_i915_private *dev_priv = ring->dev->dev_private; 1459 1460 ring->tail &= ring->size - 1; 1461 if (dev_priv->stop_rings & intel_ring_flag(ring)) 1462 return; 1463 ring->write_tail(ring, ring->tail); 1464 } 1465 1466 1467 static void gen6_bsd_ring_write_tail(struct intel_ring_buffer *ring, 1468 u32 value) 1469 { 1470 drm_i915_private_t *dev_priv = ring->dev->dev_private; 1471 1472 /* Every tail move must follow the sequence below */ 1473 1474 /* Disable notification that the ring is IDLE. The GT 1475 * will then assume that it is busy and bring it out of rc6. 1476 */ 1477 I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL, 1478 _MASKED_BIT_ENABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); 1479 1480 /* Clear the context id. Here be magic! */ 1481 I915_WRITE64(GEN6_BSD_RNCID, 0x0); 1482 1483 /* Wait for the ring not to be idle, i.e. for it to wake up. */ 1484 if (wait_for((I915_READ(GEN6_BSD_SLEEP_PSMI_CONTROL) & 1485 GEN6_BSD_SLEEP_INDICATOR) == 0, 1486 50)) 1487 DRM_ERROR("timed out waiting for the BSD ring to wake up\n"); 1488 1489 /* Now that the ring is fully powered up, update the tail */ 1490 I915_WRITE_TAIL(ring, value); 1491 POSTING_READ(RING_TAIL(ring->mmio_base)); 1492 1493 /* Let the ring send IDLE messages to the GT again, 1494 * and so let it sleep to conserve power when idle. 1495 */ 1496 I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL, 1497 _MASKED_BIT_DISABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); 1498 } 1499 1500 static int gen6_ring_flush(struct intel_ring_buffer *ring, 1501 u32 invalidate, u32 flush) 1502 { 1503 uint32_t cmd; 1504 int ret; 1505 1506 ret = intel_ring_begin(ring, 4); 1507 if (ret) 1508 return ret; 1509 1510 cmd = MI_FLUSH_DW; 1511 /* 1512 * Bspec vol 1c.5 - video engine command streamer: 1513 * "If ENABLED, all TLBs will be invalidated once the flush 1514 * operation is complete. This bit is only valid when the 1515 * Post-Sync Operation field is a value of 1h or 3h." 1516 */ 1517 if (invalidate & I915_GEM_GPU_DOMAINS) 1518 cmd |= MI_INVALIDATE_TLB | MI_INVALIDATE_BSD | 1519 MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW; 1520 intel_ring_emit(ring, cmd); 1521 intel_ring_emit(ring, I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT); 1522 intel_ring_emit(ring, 0); 1523 intel_ring_emit(ring, MI_NOOP); 1524 intel_ring_advance(ring); 1525 return 0; 1526 } 1527 1528 static int 1529 hsw_ring_dispatch_execbuffer(struct intel_ring_buffer *ring, 1530 u32 offset, u32 len, 1531 unsigned flags) 1532 { 1533 int ret; 1534 1535 ret = intel_ring_begin(ring, 2); 1536 if (ret) 1537 return ret; 1538 1539 intel_ring_emit(ring, 1540 MI_BATCH_BUFFER_START | MI_BATCH_PPGTT_HSW | 1541 (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE_HSW)); 1542 /* bit0-7 is the length on GEN6+ */ 1543 intel_ring_emit(ring, offset); 1544 intel_ring_advance(ring); 1545 1546 return 0; 1547 } 1548 1549 static int 1550 gen6_ring_dispatch_execbuffer(struct intel_ring_buffer *ring, 1551 u32 offset, u32 len, 1552 unsigned flags) 1553 { 1554 int ret; 1555 1556 ret = intel_ring_begin(ring, 2); 1557 if (ret) 1558 return ret; 1559 1560 intel_ring_emit(ring, 1561 MI_BATCH_BUFFER_START | 1562 (flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE_I965)); 1563 /* bit0-7 is the length on GEN6+ */ 1564 intel_ring_emit(ring, offset); 1565 intel_ring_advance(ring); 1566 1567 return 0; 1568 } 1569 1570 /* Blitter support (SandyBridge+) */ 1571 1572 static int blt_ring_flush(struct intel_ring_buffer *ring, 1573 u32 invalidate, u32 flush) 1574 { 1575 uint32_t cmd; 1576 int ret; 1577 1578 ret = intel_ring_begin(ring, 4); 1579 if (ret) 1580 return ret; 1581 1582 cmd = MI_FLUSH_DW; 1583 /* 1584 * Bspec vol 1c.3 - blitter engine command streamer: 1585 * "If ENABLED, all TLBs will be invalidated once the flush 1586 * operation is complete. This bit is only valid when the 1587 * Post-Sync Operation field is a value of 1h or 3h." 1588 */ 1589 if (invalidate & I915_GEM_DOMAIN_RENDER) 1590 cmd |= MI_INVALIDATE_TLB | MI_FLUSH_DW_STORE_INDEX | 1591 MI_FLUSH_DW_OP_STOREDW; 1592 intel_ring_emit(ring, cmd); 1593 intel_ring_emit(ring, I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT); 1594 intel_ring_emit(ring, 0); 1595 intel_ring_emit(ring, MI_NOOP); 1596 intel_ring_advance(ring); 1597 return 0; 1598 } 1599 1600 int intel_init_render_ring_buffer(struct drm_device *dev) 1601 { 1602 drm_i915_private_t *dev_priv = dev->dev_private; 1603 struct intel_ring_buffer *ring = &dev_priv->ring[RCS]; 1604 1605 ring->name = "render ring"; 1606 ring->id = RCS; 1607 ring->mmio_base = RENDER_RING_BASE; 1608 1609 if (INTEL_INFO(dev)->gen >= 6) { 1610 ring->add_request = gen6_add_request; 1611 ring->flush = gen7_render_ring_flush; 1612 if (INTEL_INFO(dev)->gen == 6) 1613 ring->flush = gen6_render_ring_flush; 1614 ring->irq_get = gen6_ring_get_irq; 1615 ring->irq_put = gen6_ring_put_irq; 1616 ring->irq_enable_mask = GT_USER_INTERRUPT; 1617 ring->get_seqno = gen6_ring_get_seqno; 1618 ring->sync_to = gen6_ring_sync; 1619 ring->semaphore_register[0] = MI_SEMAPHORE_SYNC_INVALID; 1620 ring->semaphore_register[1] = MI_SEMAPHORE_SYNC_RV; 1621 ring->semaphore_register[2] = MI_SEMAPHORE_SYNC_RB; 1622 ring->signal_mbox[0] = GEN6_VRSYNC; 1623 ring->signal_mbox[1] = GEN6_BRSYNC; 1624 } else if (IS_GEN5(dev)) { 1625 ring->add_request = pc_render_add_request; 1626 ring->flush = gen4_render_ring_flush; 1627 ring->get_seqno = pc_render_get_seqno; 1628 ring->irq_get = gen5_ring_get_irq; 1629 ring->irq_put = gen5_ring_put_irq; 1630 ring->irq_enable_mask = GT_USER_INTERRUPT | GT_PIPE_NOTIFY; 1631 } else { 1632 ring->add_request = i9xx_add_request; 1633 if (INTEL_INFO(dev)->gen < 4) 1634 ring->flush = gen2_render_ring_flush; 1635 else 1636 ring->flush = gen4_render_ring_flush; 1637 ring->get_seqno = ring_get_seqno; 1638 if (IS_GEN2(dev)) { 1639 ring->irq_get = i8xx_ring_get_irq; 1640 ring->irq_put = i8xx_ring_put_irq; 1641 } else { 1642 ring->irq_get = i9xx_ring_get_irq; 1643 ring->irq_put = i9xx_ring_put_irq; 1644 } 1645 ring->irq_enable_mask = I915_USER_INTERRUPT; 1646 } 1647 ring->write_tail = ring_write_tail; 1648 if (IS_HASWELL(dev)) 1649 ring->dispatch_execbuffer = hsw_ring_dispatch_execbuffer; 1650 else if (INTEL_INFO(dev)->gen >= 6) 1651 ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer; 1652 else if (INTEL_INFO(dev)->gen >= 4) 1653 ring->dispatch_execbuffer = i965_dispatch_execbuffer; 1654 else if (IS_I830(dev) || IS_845G(dev)) 1655 ring->dispatch_execbuffer = i830_dispatch_execbuffer; 1656 else 1657 ring->dispatch_execbuffer = i915_dispatch_execbuffer; 1658 ring->init = init_render_ring; 1659 ring->cleanup = render_ring_cleanup; 1660 1661 /* Workaround batchbuffer to combat CS tlb bug. */ 1662 if (HAS_BROKEN_CS_TLB(dev)) { 1663 struct drm_i915_gem_object *obj; 1664 int ret; 1665 1666 obj = i915_gem_alloc_object(dev, I830_BATCH_LIMIT); 1667 if (obj == NULL) { 1668 DRM_ERROR("Failed to allocate batch bo\n"); 1669 return -ENOMEM; 1670 } 1671 1672 ret = i915_gem_object_pin(obj, 0, true, false); 1673 if (ret != 0) { 1674 drm_gem_object_unreference(&obj->base); 1675 DRM_ERROR("Failed to ping batch bo\n"); 1676 return ret; 1677 } 1678 1679 ring->private = obj; 1680 } 1681 1682 return intel_init_ring_buffer(dev, ring); 1683 } 1684 1685 int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size) 1686 { 1687 drm_i915_private_t *dev_priv = dev->dev_private; 1688 struct intel_ring_buffer *ring = &dev_priv->ring[RCS]; 1689 int ret; 1690 1691 ring->name = "render ring"; 1692 ring->id = RCS; 1693 ring->mmio_base = RENDER_RING_BASE; 1694 1695 if (INTEL_INFO(dev)->gen >= 6) { 1696 /* non-kms not supported on gen6+ */ 1697 return -ENODEV; 1698 } 1699 1700 /* Note: gem is not supported on gen5/ilk without kms (the corresponding 1701 * gem_init ioctl returns with -ENODEV). Hence we do not need to set up 1702 * the special gen5 functions. */ 1703 ring->add_request = i9xx_add_request; 1704 if (INTEL_INFO(dev)->gen < 4) 1705 ring->flush = gen2_render_ring_flush; 1706 else 1707 ring->flush = gen4_render_ring_flush; 1708 ring->get_seqno = ring_get_seqno; 1709 if (IS_GEN2(dev)) { 1710 ring->irq_get = i8xx_ring_get_irq; 1711 ring->irq_put = i8xx_ring_put_irq; 1712 } else { 1713 ring->irq_get = i9xx_ring_get_irq; 1714 ring->irq_put = i9xx_ring_put_irq; 1715 } 1716 ring->irq_enable_mask = I915_USER_INTERRUPT; 1717 ring->write_tail = ring_write_tail; 1718 if (INTEL_INFO(dev)->gen >= 4) 1719 ring->dispatch_execbuffer = i965_dispatch_execbuffer; 1720 else if (IS_I830(dev) || IS_845G(dev)) 1721 ring->dispatch_execbuffer = i830_dispatch_execbuffer; 1722 else 1723 ring->dispatch_execbuffer = i915_dispatch_execbuffer; 1724 ring->init = init_render_ring; 1725 ring->cleanup = render_ring_cleanup; 1726 1727 ring->dev = dev; 1728 INIT_LIST_HEAD(&ring->active_list); 1729 INIT_LIST_HEAD(&ring->request_list); 1730 1731 ring->size = size; 1732 ring->effective_size = ring->size; 1733 if (IS_I830(ring->dev) || IS_845G(ring->dev)) 1734 ring->effective_size -= 128; 1735 1736 ring->virtual_start = pmap_mapdev_attr(start, size, 1737 VM_MEMATTR_WRITE_COMBINING); 1738 if (ring->virtual_start == NULL) { 1739 DRM_ERROR("can not ioremap virtual address for" 1740 " ring buffer\n"); 1741 return -ENOMEM; 1742 } 1743 1744 if (!I915_NEED_GFX_HWS(dev)) { 1745 ret = init_phys_hws_pga(ring); 1746 if (ret) 1747 return ret; 1748 } 1749 1750 return 0; 1751 } 1752 1753 int intel_init_bsd_ring_buffer(struct drm_device *dev) 1754 { 1755 drm_i915_private_t *dev_priv = dev->dev_private; 1756 struct intel_ring_buffer *ring = &dev_priv->ring[VCS]; 1757 1758 ring->name = "bsd ring"; 1759 ring->id = VCS; 1760 1761 ring->write_tail = ring_write_tail; 1762 if (IS_GEN6(dev) || IS_GEN7(dev)) { 1763 ring->mmio_base = GEN6_BSD_RING_BASE; 1764 /* gen6 bsd needs a special wa for tail updates */ 1765 if (IS_GEN6(dev)) 1766 ring->write_tail = gen6_bsd_ring_write_tail; 1767 ring->flush = gen6_ring_flush; 1768 ring->add_request = gen6_add_request; 1769 ring->get_seqno = gen6_ring_get_seqno; 1770 ring->irq_enable_mask = GEN6_BSD_USER_INTERRUPT; 1771 ring->irq_get = gen6_ring_get_irq; 1772 ring->irq_put = gen6_ring_put_irq; 1773 ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer; 1774 ring->sync_to = gen6_ring_sync; 1775 ring->semaphore_register[0] = MI_SEMAPHORE_SYNC_VR; 1776 ring->semaphore_register[1] = MI_SEMAPHORE_SYNC_INVALID; 1777 ring->semaphore_register[2] = MI_SEMAPHORE_SYNC_VB; 1778 ring->signal_mbox[0] = GEN6_RVSYNC; 1779 ring->signal_mbox[1] = GEN6_BVSYNC; 1780 } else { 1781 ring->mmio_base = BSD_RING_BASE; 1782 ring->flush = bsd_ring_flush; 1783 ring->add_request = i9xx_add_request; 1784 ring->get_seqno = ring_get_seqno; 1785 if (IS_GEN5(dev)) { 1786 ring->irq_enable_mask = GT_BSD_USER_INTERRUPT; 1787 ring->irq_get = gen5_ring_get_irq; 1788 ring->irq_put = gen5_ring_put_irq; 1789 } else { 1790 ring->irq_enable_mask = I915_BSD_USER_INTERRUPT; 1791 ring->irq_get = i9xx_ring_get_irq; 1792 ring->irq_put = i9xx_ring_put_irq; 1793 } 1794 ring->dispatch_execbuffer = i965_dispatch_execbuffer; 1795 } 1796 ring->init = init_ring_common; 1797 1798 return intel_init_ring_buffer(dev, ring); 1799 } 1800 1801 int intel_init_blt_ring_buffer(struct drm_device *dev) 1802 { 1803 drm_i915_private_t *dev_priv = dev->dev_private; 1804 struct intel_ring_buffer *ring = &dev_priv->ring[BCS]; 1805 1806 ring->name = "blitter ring"; 1807 ring->id = BCS; 1808 1809 ring->mmio_base = BLT_RING_BASE; 1810 ring->write_tail = ring_write_tail; 1811 ring->flush = blt_ring_flush; 1812 ring->add_request = gen6_add_request; 1813 ring->get_seqno = gen6_ring_get_seqno; 1814 ring->irq_enable_mask = GEN6_BLITTER_USER_INTERRUPT; 1815 ring->irq_get = gen6_ring_get_irq; 1816 ring->irq_put = gen6_ring_put_irq; 1817 ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer; 1818 ring->sync_to = gen6_ring_sync; 1819 ring->semaphore_register[0] = MI_SEMAPHORE_SYNC_BR; 1820 ring->semaphore_register[1] = MI_SEMAPHORE_SYNC_BV; 1821 ring->semaphore_register[2] = MI_SEMAPHORE_SYNC_INVALID; 1822 ring->signal_mbox[0] = GEN6_RBSYNC; 1823 ring->signal_mbox[1] = GEN6_VBSYNC; 1824 ring->init = init_ring_common; 1825 1826 return intel_init_ring_buffer(dev, ring); 1827 } 1828 1829 int 1830 intel_ring_flush_all_caches(struct intel_ring_buffer *ring) 1831 { 1832 int ret; 1833 1834 if (!ring->gpu_caches_dirty) 1835 return 0; 1836 1837 ret = ring->flush(ring, 0, I915_GEM_GPU_DOMAINS); 1838 if (ret) 1839 return ret; 1840 1841 ring->gpu_caches_dirty = false; 1842 return 0; 1843 } 1844 1845 int 1846 intel_ring_invalidate_all_caches(struct intel_ring_buffer *ring) 1847 { 1848 uint32_t flush_domains; 1849 int ret; 1850 1851 flush_domains = 0; 1852 if (ring->gpu_caches_dirty) 1853 flush_domains = I915_GEM_GPU_DOMAINS; 1854 1855 ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, flush_domains); 1856 if (ret) 1857 return ret; 1858 1859 ring->gpu_caches_dirty = false; 1860 return 0; 1861 } 1862