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