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