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