drivers/gpu/drm/etnaviv/etnaviv_mmu.c

   1 /*
   2  * Copyright (C) 2015 Etnaviv Project
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include "common.xml.h"
  18 #include "etnaviv_cmdbuf.h"
  19 #include "etnaviv_drv.h"
  20 #include "etnaviv_gem.h"
  21 #include "etnaviv_gpu.h"
  22 #include "etnaviv_iommu.h"
  23 #include "etnaviv_mmu.h"
  24
  25 static void etnaviv_domain_unmap(struct etnaviv_iommu_domain *domain,
  26                                  unsigned long iova, size_t size)
  27 {
  28         size_t unmapped_page, unmapped = 0;
  29         size_t pgsize = SZ_4K;
  30
  31         if (!IS_ALIGNED(iova | size, pgsize)) {
  32                 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
  33                        iova, size, pgsize);
  34                 return;
  35         }
  36
  37         while (unmapped < size) {
  38                 unmapped_page = domain->ops->unmap(domain, iova, pgsize);
  39                 if (!unmapped_page)
  40                         break;
  41
  42                 iova += unmapped_page;
  43                 unmapped += unmapped_page;
  44         }
  45 }
  46
  47 static int etnaviv_domain_map(struct etnaviv_iommu_domain *domain,
  48                               unsigned long iova, phys_addr_t paddr,
  49                               size_t size, int prot)
  50 {
  51         unsigned long orig_iova = iova;
  52         size_t pgsize = SZ_4K;
  53         size_t orig_size = size;
  54         int ret = 0;
  55
  56         if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
  57                 pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
  58                        iova, &paddr, size, pgsize);
  59                 return -EINVAL;
  60         }
  61
  62         while (size) {
  63                 ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
  64                 if (ret)
  65                         break;
  66
  67                 iova += pgsize;
  68                 paddr += pgsize;
  69                 size -= pgsize;
  70         }
  71
  72         /* unroll mapping in case something went wrong */
  73         if (ret)
  74                 etnaviv_domain_unmap(domain, orig_iova, orig_size - size);
  75
  76         return ret;
  77 }
  78
  79 static int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
  80                              struct sg_table *sgt, unsigned len, int prot)
  81 {
  82         struct etnaviv_iommu_domain *domain = iommu->domain;
  83         struct scatterlist *sg;
  84         unsigned int da = iova;
  85         unsigned int i, j;
  86         int ret;
  87
  88         if (!domain || !sgt)
  89                 return -EINVAL;
  90
  91         for_each_sg(sgt->sgl, sg, sgt->nents, i) {
  92                 u32 pa = sg_dma_address(sg) - sg->offset;
  93                 size_t bytes = sg_dma_len(sg) + sg->offset;
  94
  95                 VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);
  96
  97                 ret = etnaviv_domain_map(domain, da, pa, bytes, prot);
  98                 if (ret)
  99                         goto fail;
 100
 101                 da += bytes;
 102         }
 103
 104         return 0;
 105
 106 fail:
 107         da = iova;
 108
 109         for_each_sg(sgt->sgl, sg, i, j) {
 110                 size_t bytes = sg_dma_len(sg) + sg->offset;
 111
 112                 etnaviv_domain_unmap(domain, da, bytes);
 113                 da += bytes;
 114         }
 115         return ret;
 116 }
 117
 118 static void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
 119                                 struct sg_table *sgt, unsigned len)
 120 {
 121         struct etnaviv_iommu_domain *domain = iommu->domain;
 122         struct scatterlist *sg;
 123         unsigned int da = iova;
 124         int i;
 125
 126         for_each_sg(sgt->sgl, sg, sgt->nents, i) {
 127                 size_t bytes = sg_dma_len(sg) + sg->offset;
 128
 129                 etnaviv_domain_unmap(domain, da, bytes);
 130
 131                 VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
 132
 133                 BUG_ON(!PAGE_ALIGNED(bytes));
 134
 135                 da += bytes;
 136         }
 137 }
 138
 139 static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
 140         struct etnaviv_vram_mapping *mapping)
 141 {
 142         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 143
 144         etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
 145                             etnaviv_obj->sgt, etnaviv_obj->base.size);
 146         drm_mm_remove_node(&mapping->vram_node);
 147 }
 148
 149 static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
 150                                    struct drm_mm_node *node, size_t size)
 151 {
 152         struct etnaviv_vram_mapping *free = NULL;
 153         enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
 154         int ret;
 155
 156         lockdep_assert_held(&mmu->lock);
 157
 158         while (1) {
 159                 struct etnaviv_vram_mapping *m, *n;
 160                 struct drm_mm_scan scan;
 161                 struct list_head list;
 162                 bool found;
 163
 164                 ret = drm_mm_insert_node_in_range(&mmu->mm, node,
 165                                                   size, 0, 0,
 166                                                   mmu->last_iova, U64_MAX,
 167                                                   mode);
 168                 if (ret != -ENOSPC)
 169                         break;
 170
 171                 /*
 172                  * If we did not search from the start of the MMU region,
 173                  * try again in case there are free slots.
 174                  */
 175                 if (mmu->last_iova) {
 176                         mmu->last_iova = 0;
 177                         mmu->need_flush = true;
 178                         continue;
 179                 }
 180
 181                 /* Try to retire some entries */
 182                 drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, mode);
 183
 184                 found = 0;
 185                 INIT_LIST_HEAD(&list);
 186                 list_for_each_entry(free, &mmu->mappings, mmu_node) {
 187                         /* If this vram node has not been used, skip this. */
 188                         if (!free->vram_node.mm)
 189                                 continue;
 190
 191                         /*
 192                          * If the iova is pinned, then it's in-use,
 193                          * so we must keep its mapping.
 194                          */
 195                         if (free->use)
 196                                 continue;
 197
 198                         list_add(&free->scan_node, &list);
 199                         if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
 200                                 found = true;
 201                                 break;
 202                         }
 203                 }
 204
 205                 if (!found) {
 206                         /* Nothing found, clean up and fail */
 207                         list_for_each_entry_safe(m, n, &list, scan_node)
 208                                 BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node));
 209                         break;
 210                 }
 211
 212                 /*
 213                  * drm_mm does not allow any other operations while
 214                  * scanning, so we have to remove all blocks first.
 215                  * If drm_mm_scan_remove_block() returns false, we
 216                  * can leave the block pinned.
 217                  */
 218                 list_for_each_entry_safe(m, n, &list, scan_node)
 219                         if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
 220                                 list_del_init(&m->scan_node);
 221
 222                 /*
 223                  * Unmap the blocks which need to be reaped from the MMU.
 224                  * Clear the mmu pointer to prevent the mapping_get finding
 225                  * this mapping.
 226                  */
 227                 list_for_each_entry_safe(m, n, &list, scan_node) {
 228                         etnaviv_iommu_remove_mapping(mmu, m);
 229                         m->mmu = NULL;
 230                         list_del_init(&m->mmu_node);
 231                         list_del_init(&m->scan_node);
 232                 }
 233
 234                 mode = DRM_MM_INSERT_EVICT;
 235
 236                 /*
 237                  * We removed enough mappings so that the new allocation will
 238                  * succeed, retry the allocation one more time.
 239                  */
 240         }
 241
 242         return ret;
 243 }
 244
 245 int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
 246         struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
 247         struct etnaviv_vram_mapping *mapping)
 248 {
 249         struct sg_table *sgt = etnaviv_obj->sgt;
 250         struct drm_mm_node *node;
 251         int ret;
 252
 253         lockdep_assert_held(&etnaviv_obj->lock);
 254
 255         mutex_lock(&mmu->lock);
 256
 257         /* v1 MMU can optimize single entry (contiguous) scatterlists */
 258         if (mmu->version == ETNAVIV_IOMMU_V1 &&
 259             sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
 260                 u32 iova;
 261
 262                 iova = sg_dma_address(sgt->sgl) - memory_base;
 263                 if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
 264                         mapping->iova = iova;
 265                         list_add_tail(&mapping->mmu_node, &mmu->mappings);
 266                         mutex_unlock(&mmu->lock);
 267                         return 0;
 268                 }
 269         }
 270
 271         node = &mapping->vram_node;
 272
 273         ret = etnaviv_iommu_find_iova(mmu, node, etnaviv_obj->base.size);
 274         if (ret < 0) {
 275                 mutex_unlock(&mmu->lock);
 276                 return ret;
 277         }
 278
 279         mmu->last_iova = node->start + etnaviv_obj->base.size;
 280         mapping->iova = node->start;
 281         ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
 282                                 ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE);
 283
 284         if (ret < 0) {
 285                 drm_mm_remove_node(node);
 286                 mutex_unlock(&mmu->lock);
 287                 return ret;
 288         }
 289
 290         list_add_tail(&mapping->mmu_node, &mmu->mappings);
 291         mmu->need_flush = true;
 292         mutex_unlock(&mmu->lock);
 293
 294         return ret;
 295 }
 296
 297 void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
 298         struct etnaviv_vram_mapping *mapping)
 299 {
 300         WARN_ON(mapping->use);
 301
 302         mutex_lock(&mmu->lock);
 303
 304         /* If the vram node is on the mm, unmap and remove the node */
 305         if (mapping->vram_node.mm == &mmu->mm)
 306                 etnaviv_iommu_remove_mapping(mmu, mapping);
 307
 308         list_del(&mapping->mmu_node);
 309         mmu->need_flush = true;
 310         mutex_unlock(&mmu->lock);
 311 }
 312
 313 void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
 314 {
 315         drm_mm_takedown(&mmu->mm);
 316         mmu->domain->ops->free(mmu->domain);
 317         kfree(mmu);
 318 }
 319
 320 struct etnaviv_iommu *etnaviv_iommu_new(struct etnaviv_gpu *gpu)
 321 {
 322         enum etnaviv_iommu_version version;
 323         struct etnaviv_iommu *mmu;
 324
 325         mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
 326         if (!mmu)
 327                 return ERR_PTR(-ENOMEM);
 328
 329         if (!(gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)) {
 330                 mmu->domain = etnaviv_iommuv1_domain_alloc(gpu);
 331                 version = ETNAVIV_IOMMU_V1;
 332         } else {
 333                 mmu->domain = etnaviv_iommuv2_domain_alloc(gpu);
 334                 version = ETNAVIV_IOMMU_V2;
 335         }
 336
 337         if (!mmu->domain) {
 338                 dev_err(gpu->dev, "Failed to allocate GPU IOMMU domain\n");
 339                 kfree(mmu);
 340                 return ERR_PTR(-ENOMEM);
 341         }
 342
 343         mmu->gpu = gpu;
 344         mmu->version = version;
 345         mutex_init(&mmu->lock);
 346         INIT_LIST_HEAD(&mmu->mappings);
 347
 348         drm_mm_init(&mmu->mm, mmu->domain->base, mmu->domain->size);
 349
 350         return mmu;
 351 }
 352
 353 void etnaviv_iommu_restore(struct etnaviv_gpu *gpu)
 354 {
 355         if (gpu->mmu->version == ETNAVIV_IOMMU_V1)
 356                 etnaviv_iommuv1_restore(gpu);
 357         else
 358                 etnaviv_iommuv2_restore(gpu);
 359 }
 360
 361 int etnaviv_iommu_get_suballoc_va(struct etnaviv_gpu *gpu, dma_addr_t paddr,
 362                                   struct drm_mm_node *vram_node, size_t size,
 363                                   u32 *iova)
 364 {
 365         struct etnaviv_iommu *mmu = gpu->mmu;
 366
 367         if (mmu->version == ETNAVIV_IOMMU_V1) {
 368                 *iova = paddr - gpu->memory_base;
 369                 return 0;
 370         } else {
 371                 int ret;
 372
 373                 mutex_lock(&mmu->lock);
 374                 ret = etnaviv_iommu_find_iova(mmu, vram_node, size);
 375                 if (ret < 0) {
 376                         mutex_unlock(&mmu->lock);
 377                         return ret;
 378                 }
 379                 ret = etnaviv_domain_map(mmu->domain, vram_node->start, paddr,
 380                                          size, ETNAVIV_PROT_READ);
 381                 if (ret < 0) {
 382                         drm_mm_remove_node(vram_node);
 383                         mutex_unlock(&mmu->lock);
 384                         return ret;
 385                 }
 386                 mmu->last_iova = vram_node->start + size;
 387                 gpu->mmu->need_flush = true;
 388                 mutex_unlock(&mmu->lock);
 389
 390                 *iova = (u32)vram_node->start;
 391                 return 0;
 392         }
 393 }
 394
 395 void etnaviv_iommu_put_suballoc_va(struct etnaviv_gpu *gpu,
 396                                    struct drm_mm_node *vram_node, size_t size,
 397                                    u32 iova)
 398 {
 399         struct etnaviv_iommu *mmu = gpu->mmu;
 400
 401         if (mmu->version == ETNAVIV_IOMMU_V2) {
 402                 mutex_lock(&mmu->lock);
 403                 etnaviv_domain_unmap(mmu->domain, iova, size);
 404                 drm_mm_remove_node(vram_node);
 405                 mutex_unlock(&mmu->lock);
 406         }
 407 }
 408 size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
 409 {
 410         return iommu->domain->ops->dump_size(iommu->domain);
 411 }
 412
 413 void etnaviv_iommu_dump(struct etnaviv_iommu *iommu, void *buf)
 414 {
 415         iommu->domain->ops->dump(iommu->domain, buf);
 416 }