drivers/gpu/drm/etnaviv/etnaviv_mmu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2015-2018 Etnaviv Project
   4  */
   5
   6 #include "common.xml.h"
   7 #include "etnaviv_cmdbuf.h"
   8 #include "etnaviv_drv.h"
   9 #include "etnaviv_gem.h"
  10 #include "etnaviv_gpu.h"
  11 #include "etnaviv_iommu.h"
  12 #include "etnaviv_mmu.h"
  13
  14 static void etnaviv_domain_unmap(struct etnaviv_iommu_domain *domain,
  15                                  unsigned long iova, size_t size)
  16 {
  17         size_t unmapped_page, unmapped = 0;
  18         size_t pgsize = SZ_4K;
  19
  20         if (!IS_ALIGNED(iova | size, pgsize)) {
  21                 pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n",
  22                        iova, size, pgsize);
  23                 return;
  24         }
  25
  26         while (unmapped < size) {
  27                 unmapped_page = domain->ops->unmap(domain, iova, pgsize);
  28                 if (!unmapped_page)
  29                         break;
  30
  31                 iova += unmapped_page;
  32                 unmapped += unmapped_page;
  33         }
  34 }
  35
  36 static int etnaviv_domain_map(struct etnaviv_iommu_domain *domain,
  37                               unsigned long iova, phys_addr_t paddr,
  38                               size_t size, int prot)
  39 {
  40         unsigned long orig_iova = iova;
  41         size_t pgsize = SZ_4K;
  42         size_t orig_size = size;
  43         int ret = 0;
  44
  45         if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
  46                 pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n",
  47                        iova, &paddr, size, pgsize);
  48                 return -EINVAL;
  49         }
  50
  51         while (size) {
  52                 ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
  53                 if (ret)
  54                         break;
  55
  56                 iova += pgsize;
  57                 paddr += pgsize;
  58                 size -= pgsize;
  59         }
  60
  61         /* unroll mapping in case something went wrong */
  62         if (ret)
  63                 etnaviv_domain_unmap(domain, orig_iova, orig_size - size);
  64
  65         return ret;
  66 }
  67
  68 static int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
  69                              struct sg_table *sgt, unsigned len, int prot)
  70 {
  71         struct etnaviv_iommu_domain *domain = iommu->domain;
  72         struct scatterlist *sg;
  73         unsigned int da = iova;
  74         unsigned int i, j;
  75         int ret;
  76
  77         if (!domain || !sgt)
  78                 return -EINVAL;
  79
  80         for_each_sg(sgt->sgl, sg, sgt->nents, i) {
  81                 u32 pa = sg_dma_address(sg) - sg->offset;
  82                 size_t bytes = sg_dma_len(sg) + sg->offset;
  83
  84                 VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);
  85
  86                 ret = etnaviv_domain_map(domain, da, pa, bytes, prot);
  87                 if (ret)
  88                         goto fail;
  89
  90                 da += bytes;
  91         }
  92
  93         return 0;
  94
  95 fail:
  96         da = iova;
  97
  98         for_each_sg(sgt->sgl, sg, i, j) {
  99                 size_t bytes = sg_dma_len(sg) + sg->offset;
 100
 101                 etnaviv_domain_unmap(domain, da, bytes);
 102                 da += bytes;
 103         }
 104         return ret;
 105 }
 106
 107 static void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
 108                                 struct sg_table *sgt, unsigned len)
 109 {
 110         struct etnaviv_iommu_domain *domain = iommu->domain;
 111         struct scatterlist *sg;
 112         unsigned int da = iova;
 113         int i;
 114
 115         for_each_sg(sgt->sgl, sg, sgt->nents, i) {
 116                 size_t bytes = sg_dma_len(sg) + sg->offset;
 117
 118                 etnaviv_domain_unmap(domain, da, bytes);
 119
 120                 VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
 121
 122                 BUG_ON(!PAGE_ALIGNED(bytes));
 123
 124                 da += bytes;
 125         }
 126 }
 127
 128 static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
 129         struct etnaviv_vram_mapping *mapping)
 130 {
 131         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 132
 133         etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
 134                             etnaviv_obj->sgt, etnaviv_obj->base.size);
 135         drm_mm_remove_node(&mapping->vram_node);
 136 }
 137
 138 static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
 139                                    struct drm_mm_node *node, size_t size)
 140 {
 141         struct etnaviv_vram_mapping *free = NULL;
 142         enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
 143         int ret;
 144
 145         lockdep_assert_held(&mmu->lock);
 146
 147         while (1) {
 148                 struct etnaviv_vram_mapping *m, *n;
 149                 struct drm_mm_scan scan;
 150                 struct list_head list;
 151                 bool found;
 152
 153                 ret = drm_mm_insert_node_in_range(&mmu->mm, node,
 154                                                   size, 0, 0, 0, U64_MAX, mode);
 155                 if (ret != -ENOSPC)
 156                         break;
 157
 158                 /* Try to retire some entries */
 159                 drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, mode);
 160
 161                 found = 0;
 162                 INIT_LIST_HEAD(&list);
 163                 list_for_each_entry(free, &mmu->mappings, mmu_node) {
 164                         /* If this vram node has not been used, skip this. */
 165                         if (!free->vram_node.mm)
 166                                 continue;
 167
 168                         /*
 169                          * If the iova is pinned, then it's in-use,
 170                          * so we must keep its mapping.
 171                          */
 172                         if (free->use)
 173                                 continue;
 174
 175                         list_add(&free->scan_node, &list);
 176                         if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
 177                                 found = true;
 178                                 break;
 179                         }
 180                 }
 181
 182                 if (!found) {
 183                         /* Nothing found, clean up and fail */
 184                         list_for_each_entry_safe(m, n, &list, scan_node)
 185                                 BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node));
 186                         break;
 187                 }
 188
 189                 /*
 190                  * drm_mm does not allow any other operations while
 191                  * scanning, so we have to remove all blocks first.
 192                  * If drm_mm_scan_remove_block() returns false, we
 193                  * can leave the block pinned.
 194                  */
 195                 list_for_each_entry_safe(m, n, &list, scan_node)
 196                         if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
 197                                 list_del_init(&m->scan_node);
 198
 199                 /*
 200                  * Unmap the blocks which need to be reaped from the MMU.
 201                  * Clear the mmu pointer to prevent the mapping_get finding
 202                  * this mapping.
 203                  */
 204                 list_for_each_entry_safe(m, n, &list, scan_node) {
 205                         etnaviv_iommu_remove_mapping(mmu, m);
 206                         m->mmu = NULL;
 207                         list_del_init(&m->mmu_node);
 208                         list_del_init(&m->scan_node);
 209                 }
 210
 211                 mode = DRM_MM_INSERT_EVICT;
 212
 213                 /*
 214                  * We removed enough mappings so that the new allocation will
 215                  * succeed, retry the allocation one more time.
 216                  */
 217         }
 218
 219         return ret;
 220 }
 221
 222 int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
 223         struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
 224         struct etnaviv_vram_mapping *mapping)
 225 {
 226         struct sg_table *sgt = etnaviv_obj->sgt;
 227         struct drm_mm_node *node;
 228         int ret;
 229
 230         lockdep_assert_held(&etnaviv_obj->lock);
 231
 232         mutex_lock(&mmu->lock);
 233
 234         /* v1 MMU can optimize single entry (contiguous) scatterlists */
 235         if (mmu->version == ETNAVIV_IOMMU_V1 &&
 236             sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
 237                 u32 iova;
 238
 239                 iova = sg_dma_address(sgt->sgl) - memory_base;
 240                 if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
 241                         mapping->iova = iova;
 242                         list_add_tail(&mapping->mmu_node, &mmu->mappings);
 243                         ret = 0;
 244                         goto unlock;
 245                 }
 246         }
 247
 248         node = &mapping->vram_node;
 249
 250         ret = etnaviv_iommu_find_iova(mmu, node, etnaviv_obj->base.size);
 251         if (ret < 0)
 252                 goto unlock;
 253
 254         mapping->iova = node->start;
 255         ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
 256                                 ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE);
 257
 258         if (ret < 0) {
 259                 drm_mm_remove_node(node);
 260                 goto unlock;
 261         }
 262
 263         list_add_tail(&mapping->mmu_node, &mmu->mappings);
 264         mmu->need_flush = true;
 265 unlock:
 266         mutex_unlock(&mmu->lock);
 267
 268         return ret;
 269 }
 270
 271 void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
 272         struct etnaviv_vram_mapping *mapping)
 273 {
 274         WARN_ON(mapping->use);
 275
 276         mutex_lock(&mmu->lock);
 277
 278         /* If the vram node is on the mm, unmap and remove the node */
 279         if (mapping->vram_node.mm == &mmu->mm)
 280                 etnaviv_iommu_remove_mapping(mmu, mapping);
 281
 282         list_del(&mapping->mmu_node);
 283         mmu->need_flush = true;
 284         mutex_unlock(&mmu->lock);
 285 }
 286
 287 void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
 288 {
 289         drm_mm_takedown(&mmu->mm);
 290         mmu->domain->ops->free(mmu->domain);
 291         kfree(mmu);
 292 }
 293
 294 struct etnaviv_iommu *etnaviv_iommu_new(struct etnaviv_gpu *gpu)
 295 {
 296         enum etnaviv_iommu_version version;
 297         struct etnaviv_iommu *mmu;
 298
 299         mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
 300         if (!mmu)
 301                 return ERR_PTR(-ENOMEM);
 302
 303         if (!(gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)) {
 304                 mmu->domain = etnaviv_iommuv1_domain_alloc(gpu);
 305                 version = ETNAVIV_IOMMU_V1;
 306         } else {
 307                 mmu->domain = etnaviv_iommuv2_domain_alloc(gpu);
 308                 version = ETNAVIV_IOMMU_V2;
 309         }
 310
 311         if (!mmu->domain) {
 312                 dev_err(gpu->dev, "Failed to allocate GPU IOMMU domain\n");
 313                 kfree(mmu);
 314                 return ERR_PTR(-ENOMEM);
 315         }
 316
 317         mmu->gpu = gpu;
 318         mmu->version = version;
 319         mutex_init(&mmu->lock);
 320         INIT_LIST_HEAD(&mmu->mappings);
 321
 322         drm_mm_init(&mmu->mm, mmu->domain->base, mmu->domain->size);
 323
 324         return mmu;
 325 }
 326
 327 void etnaviv_iommu_restore(struct etnaviv_gpu *gpu)
 328 {
 329         if (gpu->mmu->version == ETNAVIV_IOMMU_V1)
 330                 etnaviv_iommuv1_restore(gpu);
 331         else
 332                 etnaviv_iommuv2_restore(gpu);
 333 }
 334
 335 int etnaviv_iommu_get_suballoc_va(struct etnaviv_gpu *gpu, dma_addr_t paddr,
 336                                   struct drm_mm_node *vram_node, size_t size,
 337                                   u32 *iova)
 338 {
 339         struct etnaviv_iommu *mmu = gpu->mmu;
 340
 341         if (mmu->version == ETNAVIV_IOMMU_V1) {
 342                 *iova = paddr - gpu->memory_base;
 343                 return 0;
 344         } else {
 345                 int ret;
 346
 347                 mutex_lock(&mmu->lock);
 348                 ret = etnaviv_iommu_find_iova(mmu, vram_node, size);
 349                 if (ret < 0) {
 350                         mutex_unlock(&mmu->lock);
 351                         return ret;
 352                 }
 353                 ret = etnaviv_domain_map(mmu->domain, vram_node->start, paddr,
 354                                          size, ETNAVIV_PROT_READ);
 355                 if (ret < 0) {
 356                         drm_mm_remove_node(vram_node);
 357                         mutex_unlock(&mmu->lock);
 358                         return ret;
 359                 }
 360                 gpu->mmu->need_flush = true;
 361                 mutex_unlock(&mmu->lock);
 362
 363                 *iova = (u32)vram_node->start;
 364                 return 0;
 365         }
 366 }
 367
 368 void etnaviv_iommu_put_suballoc_va(struct etnaviv_gpu *gpu,
 369                                    struct drm_mm_node *vram_node, size_t size,
 370                                    u32 iova)
 371 {
 372         struct etnaviv_iommu *mmu = gpu->mmu;
 373
 374         if (mmu->version == ETNAVIV_IOMMU_V2) {
 375                 mutex_lock(&mmu->lock);
 376                 etnaviv_domain_unmap(mmu->domain, iova, size);
 377                 drm_mm_remove_node(vram_node);
 378                 mutex_unlock(&mmu->lock);
 379         }
 380 }
 381 size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
 382 {
 383         return iommu->domain->ops->dump_size(iommu->domain);
 384 }
 385
 386 void etnaviv_iommu_dump(struct etnaviv_iommu *iommu, void *buf)
 387 {
 388         iommu->domain->ops->dump(iommu->domain, buf);
 389 }