1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2015-2018 Etnaviv Project 4 */ 5 6 #include <linux/dma-mapping.h> 7 #include <linux/scatterlist.h> 8 9 #include "common.xml.h" 10 #include "etnaviv_cmdbuf.h" 11 #include "etnaviv_drv.h" 12 #include "etnaviv_gem.h" 13 #include "etnaviv_gpu.h" 14 #include "etnaviv_mmu.h" 15 16 static void etnaviv_context_unmap(struct etnaviv_iommu_context *context, 17 unsigned long iova, size_t size) 18 { 19 size_t unmapped_page, unmapped = 0; 20 size_t pgsize = SZ_4K; 21 22 if (!IS_ALIGNED(iova | size, pgsize)) { 23 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n", 24 iova, size, pgsize); 25 return; 26 } 27 28 while (unmapped < size) { 29 unmapped_page = context->global->ops->unmap(context, iova, 30 pgsize); 31 if (!unmapped_page) 32 break; 33 34 iova += unmapped_page; 35 unmapped += unmapped_page; 36 } 37 } 38 39 static int etnaviv_context_map(struct etnaviv_iommu_context *context, 40 unsigned long iova, phys_addr_t paddr, 41 size_t size, int prot) 42 { 43 unsigned long orig_iova = iova; 44 size_t pgsize = SZ_4K; 45 size_t orig_size = size; 46 int ret = 0; 47 48 if (!IS_ALIGNED(iova | paddr | size, pgsize)) { 49 pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n", 50 iova, &paddr, size, pgsize); 51 return -EINVAL; 52 } 53 54 while (size) { 55 ret = context->global->ops->map(context, iova, paddr, pgsize, 56 prot); 57 if (ret) 58 break; 59 60 iova += pgsize; 61 paddr += pgsize; 62 size -= pgsize; 63 } 64 65 /* unroll mapping in case something went wrong */ 66 if (ret) 67 etnaviv_context_unmap(context, orig_iova, orig_size - size); 68 69 return ret; 70 } 71 72 static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova, 73 struct sg_table *sgt, int prot) 74 { struct scatterlist *sg; 75 unsigned int da = iova; 76 unsigned int i; 77 int ret; 78 79 if (!context || !sgt) 80 return -EINVAL; 81 82 for_each_sgtable_dma_sg(sgt, sg, i) { 83 phys_addr_t pa = sg_dma_address(sg) - sg->offset; 84 size_t bytes = sg_dma_len(sg) + sg->offset; 85 86 VERB("map[%d]: %08x %pap(%zx)", i, iova, &pa, bytes); 87 88 ret = etnaviv_context_map(context, da, pa, bytes, prot); 89 if (ret) 90 goto fail; 91 92 da += bytes; 93 } 94 95 context->flush_seq++; 96 97 return 0; 98 99 fail: 100 etnaviv_context_unmap(context, iova, da - iova); 101 return ret; 102 } 103 104 static void etnaviv_iommu_unmap(struct etnaviv_iommu_context *context, u32 iova, 105 struct sg_table *sgt, unsigned len) 106 { 107 struct scatterlist *sg; 108 unsigned int da = iova; 109 int i; 110 111 for_each_sgtable_dma_sg(sgt, sg, i) { 112 size_t bytes = sg_dma_len(sg) + sg->offset; 113 114 etnaviv_context_unmap(context, da, bytes); 115 116 VERB("unmap[%d]: %08x(%zx)", i, iova, bytes); 117 118 BUG_ON(!PAGE_ALIGNED(bytes)); 119 120 da += bytes; 121 } 122 123 context->flush_seq++; 124 } 125 126 static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu_context *context, 127 struct etnaviv_vram_mapping *mapping) 128 { 129 struct etnaviv_gem_object *etnaviv_obj = mapping->object; 130 131 lockdep_assert_held(&context->lock); 132 133 etnaviv_iommu_unmap(context, mapping->vram_node.start, 134 etnaviv_obj->sgt, etnaviv_obj->base.size); 135 drm_mm_remove_node(&mapping->vram_node); 136 } 137 138 void etnaviv_iommu_reap_mapping(struct etnaviv_vram_mapping *mapping) 139 { 140 struct etnaviv_iommu_context *context = mapping->context; 141 142 lockdep_assert_held(&context->lock); 143 WARN_ON(mapping->use); 144 145 etnaviv_iommu_remove_mapping(context, mapping); 146 etnaviv_iommu_context_put(mapping->context); 147 mapping->context = NULL; 148 list_del_init(&mapping->mmu_node); 149 } 150 151 static int etnaviv_iommu_find_iova(struct etnaviv_iommu_context *context, 152 struct drm_mm_node *node, size_t size) 153 { 154 struct etnaviv_vram_mapping *free = NULL; 155 enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW; 156 int ret; 157 158 lockdep_assert_held(&context->lock); 159 160 while (1) { 161 struct etnaviv_vram_mapping *m, *n; 162 struct drm_mm_scan scan; 163 struct list_head list; 164 bool found; 165 166 ret = drm_mm_insert_node_in_range(&context->mm, node, 167 size, 0, 0, 0, U64_MAX, mode); 168 if (ret != -ENOSPC) 169 break; 170 171 /* Try to retire some entries */ 172 drm_mm_scan_init(&scan, &context->mm, size, 0, 0, mode); 173 174 found = 0; 175 INIT_LIST_HEAD(&list); 176 list_for_each_entry(free, &context->mappings, mmu_node) { 177 /* If this vram node has not been used, skip this. */ 178 if (!free->vram_node.mm) 179 continue; 180 181 /* 182 * If the iova is pinned, then it's in-use, 183 * so we must keep its mapping. 184 */ 185 if (free->use) 186 continue; 187 188 list_add(&free->scan_node, &list); 189 if (drm_mm_scan_add_block(&scan, &free->vram_node)) { 190 found = true; 191 break; 192 } 193 } 194 195 if (!found) { 196 /* Nothing found, clean up and fail */ 197 list_for_each_entry_safe(m, n, &list, scan_node) 198 BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node)); 199 break; 200 } 201 202 /* 203 * drm_mm does not allow any other operations while 204 * scanning, so we have to remove all blocks first. 205 * If drm_mm_scan_remove_block() returns false, we 206 * can leave the block pinned. 207 */ 208 list_for_each_entry_safe(m, n, &list, scan_node) 209 if (!drm_mm_scan_remove_block(&scan, &m->vram_node)) 210 list_del_init(&m->scan_node); 211 212 /* 213 * Unmap the blocks which need to be reaped from the MMU. 214 * Clear the mmu pointer to prevent the mapping_get finding 215 * this mapping. 216 */ 217 list_for_each_entry_safe(m, n, &list, scan_node) { 218 etnaviv_iommu_reap_mapping(m); 219 list_del_init(&m->scan_node); 220 } 221 222 mode = DRM_MM_INSERT_EVICT; 223 224 /* 225 * We removed enough mappings so that the new allocation will 226 * succeed, retry the allocation one more time. 227 */ 228 } 229 230 return ret; 231 } 232 233 static int etnaviv_iommu_insert_exact(struct etnaviv_iommu_context *context, 234 struct drm_mm_node *node, size_t size, u64 va) 235 { 236 struct etnaviv_vram_mapping *m, *n; 237 struct drm_mm_node *scan_node; 238 LIST_HEAD(scan_list); 239 int ret; 240 241 lockdep_assert_held(&context->lock); 242 243 ret = drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va, 244 va + size, DRM_MM_INSERT_LOWEST); 245 if (ret != -ENOSPC) 246 return ret; 247 248 /* 249 * When we can't insert the node, due to a existing mapping blocking 250 * the address space, there are two possible reasons: 251 * 1. Userspace genuinely messed up and tried to reuse address space 252 * before the last job using this VMA has finished executing. 253 * 2. The existing buffer mappings are idle, but the buffers are not 254 * destroyed yet (likely due to being referenced by another context) in 255 * which case the mappings will not be cleaned up and we must reap them 256 * here to make space for the new mapping. 257 */ 258 259 drm_mm_for_each_node_in_range(scan_node, &context->mm, va, va + size) { 260 m = container_of(scan_node, struct etnaviv_vram_mapping, 261 vram_node); 262 263 if (m->use) 264 return -ENOSPC; 265 266 list_add(&m->scan_node, &scan_list); 267 } 268 269 list_for_each_entry_safe(m, n, &scan_list, scan_node) { 270 etnaviv_iommu_reap_mapping(m); 271 list_del_init(&m->scan_node); 272 } 273 274 return drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va, 275 va + size, DRM_MM_INSERT_LOWEST); 276 } 277 278 int etnaviv_iommu_map_gem(struct etnaviv_iommu_context *context, 279 struct etnaviv_gem_object *etnaviv_obj, u32 memory_base, 280 struct etnaviv_vram_mapping *mapping, u64 va) 281 { 282 struct sg_table *sgt = etnaviv_obj->sgt; 283 struct drm_mm_node *node; 284 int ret; 285 286 lockdep_assert_held(&etnaviv_obj->lock); 287 288 mutex_lock(&context->lock); 289 290 /* v1 MMU can optimize single entry (contiguous) scatterlists */ 291 if (context->global->version == ETNAVIV_IOMMU_V1 && 292 sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) { 293 u32 iova; 294 295 iova = sg_dma_address(sgt->sgl) - memory_base; 296 if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) { 297 mapping->iova = iova; 298 mapping->context = etnaviv_iommu_context_get(context); 299 list_add_tail(&mapping->mmu_node, &context->mappings); 300 ret = 0; 301 goto unlock; 302 } 303 } 304 305 node = &mapping->vram_node; 306 307 if (va) 308 ret = etnaviv_iommu_insert_exact(context, node, 309 etnaviv_obj->base.size, va); 310 else 311 ret = etnaviv_iommu_find_iova(context, node, 312 etnaviv_obj->base.size); 313 if (ret < 0) 314 goto unlock; 315 316 mapping->iova = node->start; 317 ret = etnaviv_iommu_map(context, node->start, sgt, 318 ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE); 319 320 if (ret < 0) { 321 drm_mm_remove_node(node); 322 goto unlock; 323 } 324 325 mapping->context = etnaviv_iommu_context_get(context); 326 list_add_tail(&mapping->mmu_node, &context->mappings); 327 unlock: 328 mutex_unlock(&context->lock); 329 330 return ret; 331 } 332 333 void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context, 334 struct etnaviv_vram_mapping *mapping) 335 { 336 WARN_ON(mapping->use); 337 338 mutex_lock(&context->lock); 339 340 /* Bail if the mapping has been reaped by another thread */ 341 if (!mapping->context) { 342 mutex_unlock(&context->lock); 343 return; 344 } 345 346 /* If the vram node is on the mm, unmap and remove the node */ 347 if (mapping->vram_node.mm == &context->mm) 348 etnaviv_iommu_remove_mapping(context, mapping); 349 350 list_del(&mapping->mmu_node); 351 mutex_unlock(&context->lock); 352 etnaviv_iommu_context_put(context); 353 } 354 355 static void etnaviv_iommu_context_free(struct kref *kref) 356 { 357 struct etnaviv_iommu_context *context = 358 container_of(kref, struct etnaviv_iommu_context, refcount); 359 360 etnaviv_cmdbuf_suballoc_unmap(context, &context->cmdbuf_mapping); 361 362 context->global->ops->free(context); 363 } 364 void etnaviv_iommu_context_put(struct etnaviv_iommu_context *context) 365 { 366 kref_put(&context->refcount, etnaviv_iommu_context_free); 367 } 368 369 struct etnaviv_iommu_context * 370 etnaviv_iommu_context_init(struct etnaviv_iommu_global *global, 371 struct etnaviv_cmdbuf_suballoc *suballoc) 372 { 373 struct etnaviv_iommu_context *ctx; 374 int ret; 375 376 if (global->version == ETNAVIV_IOMMU_V1) 377 ctx = etnaviv_iommuv1_context_alloc(global); 378 else 379 ctx = etnaviv_iommuv2_context_alloc(global); 380 381 if (!ctx) 382 return NULL; 383 384 ret = etnaviv_cmdbuf_suballoc_map(suballoc, ctx, &ctx->cmdbuf_mapping, 385 global->memory_base); 386 if (ret) 387 goto out_free; 388 389 if (global->version == ETNAVIV_IOMMU_V1 && 390 ctx->cmdbuf_mapping.iova > 0x80000000) { 391 dev_err(global->dev, 392 "command buffer outside valid memory window\n"); 393 goto out_unmap; 394 } 395 396 return ctx; 397 398 out_unmap: 399 etnaviv_cmdbuf_suballoc_unmap(ctx, &ctx->cmdbuf_mapping); 400 out_free: 401 global->ops->free(ctx); 402 return NULL; 403 } 404 405 void etnaviv_iommu_restore(struct etnaviv_gpu *gpu, 406 struct etnaviv_iommu_context *context) 407 { 408 context->global->ops->restore(gpu, context); 409 } 410 411 int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *context, 412 struct etnaviv_vram_mapping *mapping, 413 u32 memory_base, dma_addr_t paddr, 414 size_t size) 415 { 416 mutex_lock(&context->lock); 417 418 if (mapping->use > 0) { 419 mapping->use++; 420 mutex_unlock(&context->lock); 421 return 0; 422 } 423 424 /* 425 * For MMUv1 we don't add the suballoc region to the pagetables, as 426 * those GPUs can only work with cmdbufs accessed through the linear 427 * window. Instead we manufacture a mapping to make it look uniform 428 * to the upper layers. 429 */ 430 if (context->global->version == ETNAVIV_IOMMU_V1) { 431 mapping->iova = paddr - memory_base; 432 } else { 433 struct drm_mm_node *node = &mapping->vram_node; 434 int ret; 435 436 ret = etnaviv_iommu_find_iova(context, node, size); 437 if (ret < 0) { 438 mutex_unlock(&context->lock); 439 return ret; 440 } 441 442 mapping->iova = node->start; 443 ret = etnaviv_context_map(context, node->start, paddr, size, 444 ETNAVIV_PROT_READ); 445 if (ret < 0) { 446 drm_mm_remove_node(node); 447 mutex_unlock(&context->lock); 448 return ret; 449 } 450 451 context->flush_seq++; 452 } 453 454 list_add_tail(&mapping->mmu_node, &context->mappings); 455 mapping->use = 1; 456 457 mutex_unlock(&context->lock); 458 459 return 0; 460 } 461 462 void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *context, 463 struct etnaviv_vram_mapping *mapping) 464 { 465 struct drm_mm_node *node = &mapping->vram_node; 466 467 mutex_lock(&context->lock); 468 mapping->use--; 469 470 if (mapping->use > 0 || context->global->version == ETNAVIV_IOMMU_V1) { 471 mutex_unlock(&context->lock); 472 return; 473 } 474 475 etnaviv_context_unmap(context, node->start, node->size); 476 drm_mm_remove_node(node); 477 mutex_unlock(&context->lock); 478 } 479 480 size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *context) 481 { 482 return context->global->ops->dump_size(context); 483 } 484 485 void etnaviv_iommu_dump(struct etnaviv_iommu_context *context, void *buf) 486 { 487 context->global->ops->dump(context, buf); 488 } 489 490 int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu) 491 { 492 enum etnaviv_iommu_version version = ETNAVIV_IOMMU_V1; 493 struct etnaviv_drm_private *priv = gpu->drm->dev_private; 494 struct etnaviv_iommu_global *global; 495 struct device *dev = gpu->drm->dev; 496 497 if (gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION) 498 version = ETNAVIV_IOMMU_V2; 499 500 if (priv->mmu_global) { 501 if (priv->mmu_global->version != version) { 502 dev_err(gpu->dev, 503 "MMU version doesn't match global version\n"); 504 return -ENXIO; 505 } 506 507 priv->mmu_global->use++; 508 return 0; 509 } 510 511 global = kzalloc(sizeof(*global), GFP_KERNEL); 512 if (!global) 513 return -ENOMEM; 514 515 global->bad_page_cpu = dma_alloc_wc(dev, SZ_4K, &global->bad_page_dma, 516 GFP_KERNEL); 517 if (!global->bad_page_cpu) 518 goto free_global; 519 520 memset32(global->bad_page_cpu, 0xdead55aa, SZ_4K / sizeof(u32)); 521 522 if (version == ETNAVIV_IOMMU_V2) { 523 global->v2.pta_cpu = dma_alloc_wc(dev, ETNAVIV_PTA_SIZE, 524 &global->v2.pta_dma, GFP_KERNEL); 525 if (!global->v2.pta_cpu) 526 goto free_bad_page; 527 } 528 529 global->dev = dev; 530 global->version = version; 531 global->use = 1; 532 mutex_init(&global->lock); 533 534 if (version == ETNAVIV_IOMMU_V1) 535 global->ops = &etnaviv_iommuv1_ops; 536 else 537 global->ops = &etnaviv_iommuv2_ops; 538 539 priv->mmu_global = global; 540 541 return 0; 542 543 free_bad_page: 544 dma_free_wc(dev, SZ_4K, global->bad_page_cpu, global->bad_page_dma); 545 free_global: 546 kfree(global); 547 548 return -ENOMEM; 549 } 550 551 void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu) 552 { 553 struct etnaviv_drm_private *priv = gpu->drm->dev_private; 554 struct etnaviv_iommu_global *global = priv->mmu_global; 555 556 if (!global) 557 return; 558 559 if (--global->use > 0) 560 return; 561 562 if (global->v2.pta_cpu) 563 dma_free_wc(global->dev, ETNAVIV_PTA_SIZE, 564 global->v2.pta_cpu, global->v2.pta_dma); 565 566 if (global->bad_page_cpu) 567 dma_free_wc(global->dev, SZ_4K, 568 global->bad_page_cpu, global->bad_page_dma); 569 570 mutex_destroy(&global->lock); 571 kfree(global); 572 573 priv->mmu_global = NULL; 574 } 575