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