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 etnaviv_iommu_context_put(m->context); 203 m->context = NULL; 204 list_del_init(&m->mmu_node); 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 lockdep_assert_held(&context->lock); 223 224 return drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va, 225 va + size, DRM_MM_INSERT_LOWEST); 226 } 227 228 int etnaviv_iommu_map_gem(struct etnaviv_iommu_context *context, 229 struct etnaviv_gem_object *etnaviv_obj, u32 memory_base, 230 struct etnaviv_vram_mapping *mapping, u64 va) 231 { 232 struct sg_table *sgt = etnaviv_obj->sgt; 233 struct drm_mm_node *node; 234 int ret; 235 236 lockdep_assert_held(&etnaviv_obj->lock); 237 238 mutex_lock(&context->lock); 239 240 /* v1 MMU can optimize single entry (contiguous) scatterlists */ 241 if (context->global->version == ETNAVIV_IOMMU_V1 && 242 sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) { 243 u32 iova; 244 245 iova = sg_dma_address(sgt->sgl) - memory_base; 246 if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) { 247 mapping->iova = iova; 248 list_add_tail(&mapping->mmu_node, &context->mappings); 249 ret = 0; 250 goto unlock; 251 } 252 } 253 254 node = &mapping->vram_node; 255 256 if (va) 257 ret = etnaviv_iommu_insert_exact(context, node, 258 etnaviv_obj->base.size, va); 259 else 260 ret = etnaviv_iommu_find_iova(context, node, 261 etnaviv_obj->base.size); 262 if (ret < 0) 263 goto unlock; 264 265 mapping->iova = node->start; 266 ret = etnaviv_iommu_map(context, node->start, sgt, etnaviv_obj->base.size, 267 ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE); 268 269 if (ret < 0) { 270 drm_mm_remove_node(node); 271 goto unlock; 272 } 273 274 list_add_tail(&mapping->mmu_node, &context->mappings); 275 context->flush_seq++; 276 unlock: 277 mutex_unlock(&context->lock); 278 279 return ret; 280 } 281 282 void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context, 283 struct etnaviv_vram_mapping *mapping) 284 { 285 WARN_ON(mapping->use); 286 287 mutex_lock(&context->lock); 288 289 /* If the vram node is on the mm, unmap and remove the node */ 290 if (mapping->vram_node.mm == &context->mm) 291 etnaviv_iommu_remove_mapping(context, mapping); 292 293 list_del(&mapping->mmu_node); 294 context->flush_seq++; 295 mutex_unlock(&context->lock); 296 } 297 298 static void etnaviv_iommu_context_free(struct kref *kref) 299 { 300 struct etnaviv_iommu_context *context = 301 container_of(kref, struct etnaviv_iommu_context, refcount); 302 303 etnaviv_cmdbuf_suballoc_unmap(context, &context->cmdbuf_mapping); 304 305 context->global->ops->free(context); 306 } 307 void etnaviv_iommu_context_put(struct etnaviv_iommu_context *context) 308 { 309 kref_put(&context->refcount, etnaviv_iommu_context_free); 310 } 311 312 struct etnaviv_iommu_context * 313 etnaviv_iommu_context_init(struct etnaviv_iommu_global *global, 314 struct etnaviv_cmdbuf_suballoc *suballoc) 315 { 316 struct etnaviv_iommu_context *ctx; 317 int ret; 318 319 if (global->version == ETNAVIV_IOMMU_V1) 320 ctx = etnaviv_iommuv1_context_alloc(global); 321 else 322 ctx = etnaviv_iommuv2_context_alloc(global); 323 324 if (!ctx) 325 return NULL; 326 327 ret = etnaviv_cmdbuf_suballoc_map(suballoc, ctx, &ctx->cmdbuf_mapping, 328 global->memory_base); 329 if (ret) 330 goto out_free; 331 332 if (global->version == ETNAVIV_IOMMU_V1 && 333 ctx->cmdbuf_mapping.iova > 0x80000000) { 334 dev_err(global->dev, 335 "command buffer outside valid memory window\n"); 336 goto out_unmap; 337 } 338 339 return ctx; 340 341 out_unmap: 342 etnaviv_cmdbuf_suballoc_unmap(ctx, &ctx->cmdbuf_mapping); 343 out_free: 344 global->ops->free(ctx); 345 return NULL; 346 } 347 348 void etnaviv_iommu_restore(struct etnaviv_gpu *gpu, 349 struct etnaviv_iommu_context *context) 350 { 351 context->global->ops->restore(gpu, context); 352 } 353 354 int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *context, 355 struct etnaviv_vram_mapping *mapping, 356 u32 memory_base, dma_addr_t paddr, 357 size_t size) 358 { 359 mutex_lock(&context->lock); 360 361 if (mapping->use > 0) { 362 mapping->use++; 363 mutex_unlock(&context->lock); 364 return 0; 365 } 366 367 /* 368 * For MMUv1 we don't add the suballoc region to the pagetables, as 369 * those GPUs can only work with cmdbufs accessed through the linear 370 * window. Instead we manufacture a mapping to make it look uniform 371 * to the upper layers. 372 */ 373 if (context->global->version == ETNAVIV_IOMMU_V1) { 374 mapping->iova = paddr - memory_base; 375 } else { 376 struct drm_mm_node *node = &mapping->vram_node; 377 int ret; 378 379 ret = etnaviv_iommu_find_iova(context, node, size); 380 if (ret < 0) { 381 mutex_unlock(&context->lock); 382 return ret; 383 } 384 385 mapping->iova = node->start; 386 ret = etnaviv_context_map(context, node->start, paddr, size, 387 ETNAVIV_PROT_READ); 388 if (ret < 0) { 389 drm_mm_remove_node(node); 390 mutex_unlock(&context->lock); 391 return ret; 392 } 393 394 context->flush_seq++; 395 } 396 397 list_add_tail(&mapping->mmu_node, &context->mappings); 398 mapping->use = 1; 399 400 mutex_unlock(&context->lock); 401 402 return 0; 403 } 404 405 void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *context, 406 struct etnaviv_vram_mapping *mapping) 407 { 408 struct drm_mm_node *node = &mapping->vram_node; 409 410 mutex_lock(&context->lock); 411 mapping->use--; 412 413 if (mapping->use > 0 || context->global->version == ETNAVIV_IOMMU_V1) { 414 mutex_unlock(&context->lock); 415 return; 416 } 417 418 etnaviv_context_unmap(context, node->start, node->size); 419 drm_mm_remove_node(node); 420 mutex_unlock(&context->lock); 421 } 422 423 size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *context) 424 { 425 return context->global->ops->dump_size(context); 426 } 427 428 void etnaviv_iommu_dump(struct etnaviv_iommu_context *context, void *buf) 429 { 430 context->global->ops->dump(context, buf); 431 } 432 433 int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu) 434 { 435 enum etnaviv_iommu_version version = ETNAVIV_IOMMU_V1; 436 struct etnaviv_drm_private *priv = gpu->drm->dev_private; 437 struct etnaviv_iommu_global *global; 438 struct device *dev = gpu->drm->dev; 439 440 if (gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION) 441 version = ETNAVIV_IOMMU_V2; 442 443 if (priv->mmu_global) { 444 if (priv->mmu_global->version != version) { 445 dev_err(gpu->dev, 446 "MMU version doesn't match global version\n"); 447 return -ENXIO; 448 } 449 450 priv->mmu_global->use++; 451 return 0; 452 } 453 454 global = kzalloc(sizeof(*global), GFP_KERNEL); 455 if (!global) 456 return -ENOMEM; 457 458 global->bad_page_cpu = dma_alloc_wc(dev, SZ_4K, &global->bad_page_dma, 459 GFP_KERNEL); 460 if (!global->bad_page_cpu) 461 goto free_global; 462 463 memset32(global->bad_page_cpu, 0xdead55aa, SZ_4K / sizeof(u32)); 464 465 if (version == ETNAVIV_IOMMU_V2) { 466 global->v2.pta_cpu = dma_alloc_wc(dev, ETNAVIV_PTA_SIZE, 467 &global->v2.pta_dma, GFP_KERNEL); 468 if (!global->v2.pta_cpu) 469 goto free_bad_page; 470 } 471 472 global->dev = dev; 473 global->version = version; 474 global->use = 1; 475 mutex_init(&global->lock); 476 477 if (version == ETNAVIV_IOMMU_V1) 478 global->ops = &etnaviv_iommuv1_ops; 479 else 480 global->ops = &etnaviv_iommuv2_ops; 481 482 priv->mmu_global = global; 483 484 return 0; 485 486 free_bad_page: 487 dma_free_wc(dev, SZ_4K, global->bad_page_cpu, global->bad_page_dma); 488 free_global: 489 kfree(global); 490 491 return -ENOMEM; 492 } 493 494 void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu) 495 { 496 struct etnaviv_drm_private *priv = gpu->drm->dev_private; 497 struct etnaviv_iommu_global *global = priv->mmu_global; 498 499 if (--global->use > 0) 500 return; 501 502 if (global->v2.pta_cpu) 503 dma_free_wc(global->dev, ETNAVIV_PTA_SIZE, 504 global->v2.pta_cpu, global->v2.pta_dma); 505 506 if (global->bad_page_cpu) 507 dma_free_wc(global->dev, SZ_4K, 508 global->bad_page_cpu, global->bad_page_dma); 509 510 mutex_destroy(&global->lock); 511 kfree(global); 512 513 priv->mmu_global = NULL; 514 } 515