1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2020 Intel Corporation 4 */ 5 6 #include <linux/log2.h> 7 8 #include "gen6_ppgtt.h" 9 #include "i915_scatterlist.h" 10 #include "i915_trace.h" 11 #include "i915_vgpu.h" 12 #include "intel_gt.h" 13 14 /* Write pde (index) from the page directory @pd to the page table @pt */ 15 static inline void gen6_write_pde(const struct gen6_ppgtt *ppgtt, 16 const unsigned int pde, 17 const struct i915_page_table *pt) 18 { 19 dma_addr_t addr = pt ? px_dma(pt) : px_dma(ppgtt->base.vm.scratch[1]); 20 21 /* Caller needs to make sure the write completes if necessary */ 22 iowrite32(GEN6_PDE_ADDR_ENCODE(addr) | GEN6_PDE_VALID, 23 ppgtt->pd_addr + pde); 24 } 25 26 void gen7_ppgtt_enable(struct intel_gt *gt) 27 { 28 struct drm_i915_private *i915 = gt->i915; 29 struct intel_uncore *uncore = gt->uncore; 30 struct intel_engine_cs *engine; 31 enum intel_engine_id id; 32 u32 ecochk; 33 34 intel_uncore_rmw(uncore, GAC_ECO_BITS, 0, ECOBITS_PPGTT_CACHE64B); 35 36 ecochk = intel_uncore_read(uncore, GAM_ECOCHK); 37 if (IS_HASWELL(i915)) { 38 ecochk |= ECOCHK_PPGTT_WB_HSW; 39 } else { 40 ecochk |= ECOCHK_PPGTT_LLC_IVB; 41 ecochk &= ~ECOCHK_PPGTT_GFDT_IVB; 42 } 43 intel_uncore_write(uncore, GAM_ECOCHK, ecochk); 44 45 for_each_engine(engine, gt, id) { 46 /* GFX_MODE is per-ring on gen7+ */ 47 ENGINE_WRITE(engine, 48 RING_MODE_GEN7, 49 _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE)); 50 } 51 } 52 53 void gen6_ppgtt_enable(struct intel_gt *gt) 54 { 55 struct intel_uncore *uncore = gt->uncore; 56 57 intel_uncore_rmw(uncore, 58 GAC_ECO_BITS, 59 0, 60 ECOBITS_SNB_BIT | ECOBITS_PPGTT_CACHE64B); 61 62 intel_uncore_rmw(uncore, 63 GAB_CTL, 64 0, 65 GAB_CTL_CONT_AFTER_PAGEFAULT); 66 67 intel_uncore_rmw(uncore, 68 GAM_ECOCHK, 69 0, 70 ECOCHK_SNB_BIT | ECOCHK_PPGTT_CACHE64B); 71 72 if (HAS_PPGTT(uncore->i915)) /* may be disabled for VT-d */ 73 intel_uncore_write(uncore, 74 GFX_MODE, 75 _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE)); 76 } 77 78 /* PPGTT support for Sandybdrige/Gen6 and later */ 79 static void gen6_ppgtt_clear_range(struct i915_address_space *vm, 80 u64 start, u64 length) 81 { 82 struct gen6_ppgtt * const ppgtt = to_gen6_ppgtt(i915_vm_to_ppgtt(vm)); 83 const unsigned int first_entry = start / I915_GTT_PAGE_SIZE; 84 const gen6_pte_t scratch_pte = vm->scratch[0]->encode; 85 unsigned int pde = first_entry / GEN6_PTES; 86 unsigned int pte = first_entry % GEN6_PTES; 87 unsigned int num_entries = length / I915_GTT_PAGE_SIZE; 88 89 while (num_entries) { 90 struct i915_page_table * const pt = 91 i915_pt_entry(ppgtt->base.pd, pde++); 92 const unsigned int count = min(num_entries, GEN6_PTES - pte); 93 gen6_pte_t *vaddr; 94 95 num_entries -= count; 96 97 GEM_BUG_ON(count > atomic_read(&pt->used)); 98 if (!atomic_sub_return(count, &pt->used)) 99 ppgtt->scan_for_unused_pt = true; 100 101 /* 102 * Note that the hw doesn't support removing PDE on the fly 103 * (they are cached inside the context with no means to 104 * invalidate the cache), so we can only reset the PTE 105 * entries back to scratch. 106 */ 107 108 vaddr = kmap_atomic_px(pt); 109 memset32(vaddr + pte, scratch_pte, count); 110 kunmap_atomic(vaddr); 111 112 pte = 0; 113 } 114 } 115 116 static void gen6_ppgtt_insert_entries(struct i915_address_space *vm, 117 struct i915_vma *vma, 118 enum i915_cache_level cache_level, 119 u32 flags) 120 { 121 struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); 122 struct i915_page_directory * const pd = ppgtt->pd; 123 unsigned int first_entry = vma->node.start / I915_GTT_PAGE_SIZE; 124 unsigned int act_pt = first_entry / GEN6_PTES; 125 unsigned int act_pte = first_entry % GEN6_PTES; 126 const u32 pte_encode = vm->pte_encode(0, cache_level, flags); 127 struct sgt_dma iter = sgt_dma(vma); 128 gen6_pte_t *vaddr; 129 130 GEM_BUG_ON(!pd->entry[act_pt]); 131 132 vaddr = kmap_atomic_px(i915_pt_entry(pd, act_pt)); 133 do { 134 GEM_BUG_ON(sg_dma_len(iter.sg) < I915_GTT_PAGE_SIZE); 135 vaddr[act_pte] = pte_encode | GEN6_PTE_ADDR_ENCODE(iter.dma); 136 137 iter.dma += I915_GTT_PAGE_SIZE; 138 if (iter.dma == iter.max) { 139 iter.sg = __sg_next(iter.sg); 140 if (!iter.sg || sg_dma_len(iter.sg) == 0) 141 break; 142 143 iter.dma = sg_dma_address(iter.sg); 144 iter.max = iter.dma + sg_dma_len(iter.sg); 145 } 146 147 if (++act_pte == GEN6_PTES) { 148 kunmap_atomic(vaddr); 149 vaddr = kmap_atomic_px(i915_pt_entry(pd, ++act_pt)); 150 act_pte = 0; 151 } 152 } while (1); 153 kunmap_atomic(vaddr); 154 155 vma->page_sizes.gtt = I915_GTT_PAGE_SIZE; 156 } 157 158 static void gen6_flush_pd(struct gen6_ppgtt *ppgtt, u64 start, u64 end) 159 { 160 struct i915_page_directory * const pd = ppgtt->base.pd; 161 struct i915_page_table *pt; 162 unsigned int pde; 163 164 start = round_down(start, SZ_64K); 165 end = round_up(end, SZ_64K) - start; 166 167 mutex_lock(&ppgtt->flush); 168 169 gen6_for_each_pde(pt, pd, start, end, pde) 170 gen6_write_pde(ppgtt, pde, pt); 171 172 mb(); 173 ioread32(ppgtt->pd_addr + pde - 1); 174 gen6_ggtt_invalidate(ppgtt->base.vm.gt->ggtt); 175 mb(); 176 177 mutex_unlock(&ppgtt->flush); 178 } 179 180 static void gen6_alloc_va_range(struct i915_address_space *vm, 181 struct i915_vm_pt_stash *stash, 182 u64 start, u64 length) 183 { 184 struct gen6_ppgtt *ppgtt = to_gen6_ppgtt(i915_vm_to_ppgtt(vm)); 185 struct i915_page_directory * const pd = ppgtt->base.pd; 186 struct i915_page_table *pt; 187 bool flush = false; 188 u64 from = start; 189 unsigned int pde; 190 191 spin_lock(&pd->lock); 192 gen6_for_each_pde(pt, pd, start, length, pde) { 193 const unsigned int count = gen6_pte_count(start, length); 194 195 if (!pt) { 196 spin_unlock(&pd->lock); 197 198 pt = stash->pt[0]; 199 __i915_gem_object_pin_pages(pt->base); 200 i915_gem_object_make_unshrinkable(pt->base); 201 202 fill32_px(pt, vm->scratch[0]->encode); 203 204 spin_lock(&pd->lock); 205 if (!pd->entry[pde]) { 206 stash->pt[0] = pt->stash; 207 atomic_set(&pt->used, 0); 208 pd->entry[pde] = pt; 209 } else { 210 pt = pd->entry[pde]; 211 } 212 213 flush = true; 214 } 215 216 atomic_add(count, &pt->used); 217 } 218 spin_unlock(&pd->lock); 219 220 if (flush && i915_vma_is_bound(ppgtt->vma, I915_VMA_GLOBAL_BIND)) { 221 intel_wakeref_t wakeref; 222 223 with_intel_runtime_pm(&vm->i915->runtime_pm, wakeref) 224 gen6_flush_pd(ppgtt, from, start); 225 } 226 } 227 228 static int gen6_ppgtt_init_scratch(struct gen6_ppgtt *ppgtt) 229 { 230 struct i915_address_space * const vm = &ppgtt->base.vm; 231 int ret; 232 233 ret = setup_scratch_page(vm); 234 if (ret) 235 return ret; 236 237 vm->scratch[0]->encode = 238 vm->pte_encode(px_dma(vm->scratch[0]), 239 I915_CACHE_NONE, PTE_READ_ONLY); 240 241 vm->scratch[1] = vm->alloc_pt_dma(vm, I915_GTT_PAGE_SIZE_4K); 242 if (IS_ERR(vm->scratch[1])) { 243 ret = PTR_ERR(vm->scratch[1]); 244 goto err_scratch0; 245 } 246 247 ret = pin_pt_dma(vm, vm->scratch[1]); 248 if (ret) 249 goto err_scratch1; 250 251 fill32_px(vm->scratch[1], vm->scratch[0]->encode); 252 253 return 0; 254 255 err_scratch1: 256 i915_gem_object_put(vm->scratch[1]); 257 err_scratch0: 258 i915_gem_object_put(vm->scratch[0]); 259 return ret; 260 } 261 262 static void gen6_ppgtt_free_pd(struct gen6_ppgtt *ppgtt) 263 { 264 struct i915_page_directory * const pd = ppgtt->base.pd; 265 struct i915_page_table *pt; 266 u32 pde; 267 268 gen6_for_all_pdes(pt, pd, pde) 269 if (pt) 270 free_pt(&ppgtt->base.vm, pt); 271 } 272 273 static void gen6_ppgtt_cleanup(struct i915_address_space *vm) 274 { 275 struct gen6_ppgtt *ppgtt = to_gen6_ppgtt(i915_vm_to_ppgtt(vm)); 276 277 __i915_vma_put(ppgtt->vma); 278 279 gen6_ppgtt_free_pd(ppgtt); 280 free_scratch(vm); 281 282 mutex_destroy(&ppgtt->flush); 283 mutex_destroy(&ppgtt->pin_mutex); 284 285 free_pd(&ppgtt->base.vm, ppgtt->base.pd); 286 } 287 288 static int pd_vma_set_pages(struct i915_vma *vma) 289 { 290 vma->pages = ERR_PTR(-ENODEV); 291 return 0; 292 } 293 294 static void pd_vma_clear_pages(struct i915_vma *vma) 295 { 296 GEM_BUG_ON(!vma->pages); 297 298 vma->pages = NULL; 299 } 300 301 static void pd_vma_bind(struct i915_address_space *vm, 302 struct i915_vm_pt_stash *stash, 303 struct i915_vma *vma, 304 enum i915_cache_level cache_level, 305 u32 unused) 306 { 307 struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); 308 struct gen6_ppgtt *ppgtt = vma->private; 309 u32 ggtt_offset = i915_ggtt_offset(vma) / I915_GTT_PAGE_SIZE; 310 311 ppgtt->pp_dir = ggtt_offset * sizeof(gen6_pte_t) << 10; 312 ppgtt->pd_addr = (gen6_pte_t __iomem *)ggtt->gsm + ggtt_offset; 313 314 gen6_flush_pd(ppgtt, 0, ppgtt->base.vm.total); 315 } 316 317 static void pd_vma_unbind(struct i915_address_space *vm, struct i915_vma *vma) 318 { 319 struct gen6_ppgtt *ppgtt = vma->private; 320 struct i915_page_directory * const pd = ppgtt->base.pd; 321 struct i915_page_table *pt; 322 unsigned int pde; 323 324 if (!ppgtt->scan_for_unused_pt) 325 return; 326 327 /* Free all no longer used page tables */ 328 gen6_for_all_pdes(pt, ppgtt->base.pd, pde) { 329 if (!pt || atomic_read(&pt->used)) 330 continue; 331 332 free_pt(&ppgtt->base.vm, pt); 333 pd->entry[pde] = NULL; 334 } 335 336 ppgtt->scan_for_unused_pt = false; 337 } 338 339 static const struct i915_vma_ops pd_vma_ops = { 340 .set_pages = pd_vma_set_pages, 341 .clear_pages = pd_vma_clear_pages, 342 .bind_vma = pd_vma_bind, 343 .unbind_vma = pd_vma_unbind, 344 }; 345 346 static struct i915_vma *pd_vma_create(struct gen6_ppgtt *ppgtt, int size) 347 { 348 struct i915_ggtt *ggtt = ppgtt->base.vm.gt->ggtt; 349 struct i915_vma *vma; 350 351 GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)); 352 GEM_BUG_ON(size > ggtt->vm.total); 353 354 vma = i915_vma_alloc(); 355 if (!vma) 356 return ERR_PTR(-ENOMEM); 357 358 i915_active_init(&vma->active, NULL, NULL); 359 360 kref_init(&vma->ref); 361 mutex_init(&vma->pages_mutex); 362 vma->vm = i915_vm_get(&ggtt->vm); 363 vma->ops = &pd_vma_ops; 364 vma->private = ppgtt; 365 366 vma->size = size; 367 vma->fence_size = size; 368 atomic_set(&vma->flags, I915_VMA_GGTT); 369 vma->ggtt_view.type = I915_GGTT_VIEW_ROTATED; /* prevent fencing */ 370 371 INIT_LIST_HEAD(&vma->obj_link); 372 INIT_LIST_HEAD(&vma->closed_link); 373 374 return vma; 375 } 376 377 int gen6_ppgtt_pin(struct i915_ppgtt *base, struct i915_gem_ww_ctx *ww) 378 { 379 struct gen6_ppgtt *ppgtt = to_gen6_ppgtt(base); 380 int err; 381 382 GEM_BUG_ON(!atomic_read(&ppgtt->base.vm.open)); 383 384 /* 385 * Workaround the limited maximum vma->pin_count and the aliasing_ppgtt 386 * which will be pinned into every active context. 387 * (When vma->pin_count becomes atomic, I expect we will naturally 388 * need a larger, unpacked, type and kill this redundancy.) 389 */ 390 if (atomic_add_unless(&ppgtt->pin_count, 1, 0)) 391 return 0; 392 393 if (mutex_lock_interruptible(&ppgtt->pin_mutex)) 394 return -EINTR; 395 396 /* 397 * PPGTT PDEs reside in the GGTT and consists of 512 entries. The 398 * allocator works in address space sizes, so it's multiplied by page 399 * size. We allocate at the top of the GTT to avoid fragmentation. 400 */ 401 err = 0; 402 if (!atomic_read(&ppgtt->pin_count)) 403 err = i915_ggtt_pin(ppgtt->vma, ww, GEN6_PD_ALIGN, PIN_HIGH); 404 if (!err) 405 atomic_inc(&ppgtt->pin_count); 406 mutex_unlock(&ppgtt->pin_mutex); 407 408 return err; 409 } 410 411 void gen6_ppgtt_unpin(struct i915_ppgtt *base) 412 { 413 struct gen6_ppgtt *ppgtt = to_gen6_ppgtt(base); 414 415 GEM_BUG_ON(!atomic_read(&ppgtt->pin_count)); 416 if (atomic_dec_and_test(&ppgtt->pin_count)) 417 i915_vma_unpin(ppgtt->vma); 418 } 419 420 void gen6_ppgtt_unpin_all(struct i915_ppgtt *base) 421 { 422 struct gen6_ppgtt *ppgtt = to_gen6_ppgtt(base); 423 424 if (!atomic_read(&ppgtt->pin_count)) 425 return; 426 427 i915_vma_unpin(ppgtt->vma); 428 atomic_set(&ppgtt->pin_count, 0); 429 } 430 431 struct i915_ppgtt *gen6_ppgtt_create(struct intel_gt *gt) 432 { 433 struct i915_ggtt * const ggtt = gt->ggtt; 434 struct gen6_ppgtt *ppgtt; 435 int err; 436 437 ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL); 438 if (!ppgtt) 439 return ERR_PTR(-ENOMEM); 440 441 mutex_init(&ppgtt->flush); 442 mutex_init(&ppgtt->pin_mutex); 443 444 ppgtt_init(&ppgtt->base, gt); 445 ppgtt->base.vm.pd_shift = ilog2(SZ_4K * SZ_4K / sizeof(gen6_pte_t)); 446 ppgtt->base.vm.top = 1; 447 448 ppgtt->base.vm.bind_async_flags = I915_VMA_LOCAL_BIND; 449 ppgtt->base.vm.allocate_va_range = gen6_alloc_va_range; 450 ppgtt->base.vm.clear_range = gen6_ppgtt_clear_range; 451 ppgtt->base.vm.insert_entries = gen6_ppgtt_insert_entries; 452 ppgtt->base.vm.cleanup = gen6_ppgtt_cleanup; 453 454 ppgtt->base.vm.alloc_pt_dma = alloc_pt_dma; 455 ppgtt->base.vm.pte_encode = ggtt->vm.pte_encode; 456 457 ppgtt->base.pd = __alloc_pd(I915_PDES); 458 if (!ppgtt->base.pd) { 459 err = -ENOMEM; 460 goto err_free; 461 } 462 463 err = gen6_ppgtt_init_scratch(ppgtt); 464 if (err) 465 goto err_pd; 466 467 ppgtt->vma = pd_vma_create(ppgtt, GEN6_PD_SIZE); 468 if (IS_ERR(ppgtt->vma)) { 469 err = PTR_ERR(ppgtt->vma); 470 goto err_scratch; 471 } 472 473 return &ppgtt->base; 474 475 err_scratch: 476 free_scratch(&ppgtt->base.vm); 477 err_pd: 478 free_pd(&ppgtt->base.vm, ppgtt->base.pd); 479 err_free: 480 mutex_destroy(&ppgtt->pin_mutex); 481 kfree(ppgtt); 482 return ERR_PTR(err); 483 } 484