drivers/staging/android/ion/ion_system_heap.c

   1 /*
   2  * drivers/gpu/ion/ion_system_heap.c
   3  *
   4  * Copyright (C) 2011 Google, Inc.
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <asm/page.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/err.h>
  20 #include <linux/highmem.h>
  21 #include <linux/mm.h>
  22 #include <linux/scatterlist.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/slab.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/rockchip-iovmm.h>
  27 #include "ion.h"
  28 #include "ion_priv.h"
  29
  30 static gfp_t high_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN |
  31                                      __GFP_NORETRY) & ~__GFP_WAIT;
  32 static gfp_t low_order_gfp_flags  = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN);
  33 static const unsigned int orders[] = {8, 4, 0};
  34 static const int num_orders = ARRAY_SIZE(orders);
  35 static int order_to_index(unsigned int order)
  36 {
  37         int i;
  38         for (i = 0; i < num_orders; i++)
  39                 if (order == orders[i])
  40                         return i;
  41         BUG();
  42         return -1;
  43 }
  44
  45 static unsigned int order_to_size(int order)
  46 {
  47         return PAGE_SIZE << order;
  48 }
  49
  50 struct ion_system_heap {
  51         struct ion_heap heap;
  52         struct ion_page_pool **pools;
  53 };
  54
  55 struct page_info {
  56         struct page *page;
  57         unsigned int order;
  58         struct list_head list;
  59 };
  60
  61 static struct page *alloc_buffer_page(struct ion_system_heap *heap,
  62                                       struct ion_buffer *buffer,
  63                                       unsigned long order)
  64 {
  65         bool cached = ion_buffer_cached(buffer);
  66         struct ion_page_pool *pool = heap->pools[order_to_index(order)];
  67         struct page *page;
  68
  69         if (!cached) {
  70                 page = ion_page_pool_alloc(pool);
  71         } else {
  72                 gfp_t gfp_flags = low_order_gfp_flags;
  73
  74                 if (order > 4)
  75                         gfp_flags = high_order_gfp_flags;
  76                 page = alloc_pages(gfp_flags, order);
  77                 if (!page)
  78                         return NULL;
  79                 ion_pages_sync_for_device(NULL, page, PAGE_SIZE << order,
  80                                                 DMA_BIDIRECTIONAL);
  81         }
  82         if (!page)
  83                 return NULL;
  84
  85         return page;
  86 }
  87
  88 static void free_buffer_page(struct ion_system_heap *heap,
  89                              struct ion_buffer *buffer, struct page *page,
  90                              unsigned int order)
  91 {
  92         bool cached = ion_buffer_cached(buffer);
  93
  94         if (!cached && !(buffer->private_flags & ION_PRIV_FLAG_SHRINKER_FREE)) {
  95                 struct ion_page_pool *pool = heap->pools[order_to_index(order)];
  96                 ion_page_pool_free(pool, page);
  97         } else {
  98                 __free_pages(page, order);
  99         }
 100 }
 101
 102
 103 static struct page_info *alloc_largest_available(struct ion_system_heap *heap,
 104                                                  struct ion_buffer *buffer,
 105                                                  unsigned long size,
 106                                                  unsigned int max_order)
 107 {
 108         struct page *page;
 109         struct page_info *info;
 110         int i;
 111
 112         info = kmalloc(sizeof(struct page_info), GFP_KERNEL);
 113         if (!info)
 114                 return NULL;
 115
 116         for (i = 0; i < num_orders; i++) {
 117                 if (size < order_to_size(orders[i]))
 118                         continue;
 119                 if (max_order < orders[i])
 120                         continue;
 121
 122                 page = alloc_buffer_page(heap, buffer, orders[i]);
 123                 if (!page)
 124                         continue;
 125
 126                 info->page = page;
 127                 info->order = orders[i];
 128                 INIT_LIST_HEAD(&info->list);
 129                 return info;
 130         }
 131         kfree(info);
 132
 133         return NULL;
 134 }
 135
 136 static int ion_system_heap_allocate(struct ion_heap *heap,
 137                                      struct ion_buffer *buffer,
 138                                      unsigned long size, unsigned long align,
 139                                      unsigned long flags)
 140 {
 141         struct ion_system_heap *sys_heap = container_of(heap,
 142                                                         struct ion_system_heap,
 143                                                         heap);
 144         struct sg_table *table;
 145         struct scatterlist *sg;
 146         int ret;
 147         struct list_head pages;
 148         struct page_info *info, *tmp_info;
 149         int i = 0;
 150         unsigned long size_remaining = PAGE_ALIGN(size);
 151         unsigned int max_order = orders[0];
 152
 153         if (align > PAGE_SIZE)
 154                 return -EINVAL;
 155
 156         if (size / PAGE_SIZE > totalram_pages / 2)
 157                 return -ENOMEM;
 158
 159         INIT_LIST_HEAD(&pages);
 160         while (size_remaining > 0) {
 161                 info = alloc_largest_available(sys_heap, buffer, size_remaining,
 162                                                 max_order);
 163                 if (!info)
 164                         goto err;
 165                 list_add_tail(&info->list, &pages);
 166                 size_remaining -= (1 << info->order) * PAGE_SIZE;
 167                 max_order = info->order;
 168                 i++;
 169         }
 170         table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
 171         if (!table)
 172                 goto err;
 173
 174         ret = sg_alloc_table(table, i, GFP_KERNEL);
 175         if (ret)
 176                 goto err1;
 177
 178         sg = table->sgl;
 179         list_for_each_entry_safe(info, tmp_info, &pages, list) {
 180                 struct page *page = info->page;
 181                 sg_set_page(sg, page, (1 << info->order) * PAGE_SIZE, 0);
 182                 sg = sg_next(sg);
 183                 list_del(&info->list);
 184                 kfree(info);
 185         }
 186
 187         buffer->priv_virt = table;
 188         return 0;
 189 err1:
 190         kfree(table);
 191 err:
 192         list_for_each_entry_safe(info, tmp_info, &pages, list) {
 193                 free_buffer_page(sys_heap, buffer, info->page, info->order);
 194                 kfree(info);
 195         }
 196         return -ENOMEM;
 197 }
 198
 199 static void ion_system_heap_free(struct ion_buffer *buffer)
 200 {
 201         struct ion_heap *heap = buffer->heap;
 202         struct ion_system_heap *sys_heap = container_of(heap,
 203                                                         struct ion_system_heap,
 204                                                         heap);
 205         struct sg_table *table = buffer->sg_table;
 206         bool cached = ion_buffer_cached(buffer);
 207         struct scatterlist *sg;
 208         LIST_HEAD(pages);
 209         int i;
 210
 211         /* uncached pages come from the page pools, zero them before returning
 212            for security purposes (other allocations are zerod at alloc time */
 213         if (!cached && !(buffer->private_flags & ION_PRIV_FLAG_SHRINKER_FREE))
 214                 ion_heap_buffer_zero(buffer);
 215
 216         for_each_sg(table->sgl, sg, table->nents, i)
 217                 free_buffer_page(sys_heap, buffer, sg_page(sg),
 218                                 get_order(sg->length));
 219         sg_free_table(table);
 220         kfree(table);
 221 }
 222
 223 static struct sg_table *ion_system_heap_map_dma(struct ion_heap *heap,
 224                                                 struct ion_buffer *buffer)
 225 {
 226         return buffer->priv_virt;
 227 }
 228
 229 static void ion_system_heap_unmap_dma(struct ion_heap *heap,
 230                                       struct ion_buffer *buffer)
 231 {
 232         return;
 233 }
 234
 235 static int ion_system_heap_shrink(struct ion_heap *heap, gfp_t gfp_mask,
 236                                         int nr_to_scan)
 237 {
 238         struct ion_system_heap *sys_heap;
 239         int nr_total = 0;
 240         int i;
 241
 242         sys_heap = container_of(heap, struct ion_system_heap, heap);
 243
 244         for (i = 0; i < num_orders; i++) {
 245                 struct ion_page_pool *pool = sys_heap->pools[i];
 246                 nr_total += ion_page_pool_shrink(pool, gfp_mask, nr_to_scan);
 247         }
 248
 249         return nr_total;
 250 }
 251
 252 #ifdef CONFIG_ROCKCHIP_IOMMU
 253 // get device's vaddr
 254 static int ion_system_map_iommu(struct ion_buffer *buffer,
 255                                 struct device *iommu_dev,
 256                                 struct ion_iommu_map *data,
 257                                 unsigned long iova_length,
 258                                 unsigned long flags)
 259 {
 260         int ret = 0;
 261         struct sg_table *table = (struct sg_table*)buffer->priv_virt;
 262
 263         data->iova_addr = rockchip_iovmm_map(iommu_dev, table->sgl, 0, iova_length);
 264         pr_debug("%s: map %x -> %lx\n", __func__, table->sgl->dma_address, data->iova_addr);
 265         if (!data->iova_addr || IS_ERR_VALUE(data->iova_addr)) {
 266                 pr_err("%s: rockchip_iovmm_map() failed: %lx\n", __func__, data->iova_addr);
 267                 ret = -EINVAL;
 268                 goto out;
 269         }
 270
 271         data->mapped_size = iova_length;
 272
 273 out:
 274         return ret;
 275 }
 276
 277 void ion_system_unmap_iommu(struct device *iommu_dev, struct ion_iommu_map *data)
 278 {
 279         pr_debug("%s: unmap %x@%lx\n", __func__, data->mapped_size, data->iova_addr);
 280         rockchip_iovmm_unmap(iommu_dev, data->iova_addr);
 281
 282         return;
 283 }
 284 #endif
 285
 286 static struct ion_heap_ops system_heap_ops = {
 287         .allocate = ion_system_heap_allocate,
 288         .free = ion_system_heap_free,
 289         .map_dma = ion_system_heap_map_dma,
 290         .unmap_dma = ion_system_heap_unmap_dma,
 291         .map_kernel = ion_heap_map_kernel,
 292         .unmap_kernel = ion_heap_unmap_kernel,
 293         .map_user = ion_heap_map_user,
 294         .shrink = ion_system_heap_shrink,
 295 #ifdef CONFIG_ROCKCHIP_IOMMU
 296         .map_iommu = ion_system_map_iommu,
 297         .unmap_iommu = ion_system_unmap_iommu,
 298 #endif
 299 };
 300
 301 static int ion_system_heap_debug_show(struct ion_heap *heap, struct seq_file *s,
 302                                       void *unused)
 303 {
 304
 305         struct ion_system_heap *sys_heap = container_of(heap,
 306                                                         struct ion_system_heap,
 307                                                         heap);
 308         int i;
 309         for (i = 0; i < num_orders; i++) {
 310                 struct ion_page_pool *pool = sys_heap->pools[i];
 311                 seq_printf(s, "%d order %u highmem pages in pool = %lu total\n",
 312                            pool->high_count, pool->order,
 313                            (1 << pool->order) * PAGE_SIZE * pool->high_count);
 314                 seq_printf(s, "%d order %u lowmem pages in pool = %lu total\n",
 315                            pool->low_count, pool->order,
 316                            (1 << pool->order) * PAGE_SIZE * pool->low_count);
 317         }
 318         return 0;
 319 }
 320
 321 struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
 322 {
 323         struct ion_system_heap *heap;
 324         int i;
 325
 326         heap = kzalloc(sizeof(struct ion_system_heap), GFP_KERNEL);
 327         if (!heap)
 328                 return ERR_PTR(-ENOMEM);
 329         heap->heap.ops = &system_heap_ops;
 330         heap->heap.type = ION_HEAP_TYPE_SYSTEM;
 331         heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
 332         heap->pools = kzalloc(sizeof(struct ion_page_pool *) * num_orders,
 333                               GFP_KERNEL);
 334         if (!heap->pools)
 335                 goto err_alloc_pools;
 336         for (i = 0; i < num_orders; i++) {
 337                 struct ion_page_pool *pool;
 338                 gfp_t gfp_flags = low_order_gfp_flags;
 339
 340                 if (orders[i] > 4)
 341                         gfp_flags = high_order_gfp_flags;
 342                 pool = ion_page_pool_create(gfp_flags, orders[i]);
 343                 if (!pool)
 344                         goto err_create_pool;
 345                 heap->pools[i] = pool;
 346         }
 347
 348         heap->heap.debug_show = ion_system_heap_debug_show;
 349         return &heap->heap;
 350 err_create_pool:
 351         for (i = 0; i < num_orders; i++)
 352                 if (heap->pools[i])
 353                         ion_page_pool_destroy(heap->pools[i]);
 354         kfree(heap->pools);
 355 err_alloc_pools:
 356         kfree(heap);
 357         return ERR_PTR(-ENOMEM);
 358 }
 359
 360 void ion_system_heap_destroy(struct ion_heap *heap)
 361 {
 362         struct ion_system_heap *sys_heap = container_of(heap,
 363                                                         struct ion_system_heap,
 364                                                         heap);
 365         int i;
 366
 367         for (i = 0; i < num_orders; i++)
 368                 ion_page_pool_destroy(sys_heap->pools[i]);
 369         kfree(sys_heap->pools);
 370         kfree(sys_heap);
 371 }
 372
 373 static int ion_system_contig_heap_allocate(struct ion_heap *heap,
 374                                            struct ion_buffer *buffer,
 375                                            unsigned long len,
 376                                            unsigned long align,
 377                                            unsigned long flags)
 378 {
 379         int order = get_order(len);
 380         struct page *page;
 381         struct sg_table *table;
 382         unsigned long i;
 383         int ret;
 384
 385         if (align > (PAGE_SIZE << order))
 386                 return -EINVAL;
 387
 388         page = alloc_pages(low_order_gfp_flags, order);
 389         if (!page)
 390                 return -ENOMEM;
 391
 392         split_page(page, order);
 393
 394         len = PAGE_ALIGN(len);
 395         for (i = len >> PAGE_SHIFT; i < (1 << order); i++)
 396                 __free_page(page + i);
 397
 398         table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
 399         if (!table) {
 400                 ret = -ENOMEM;
 401                 goto out;
 402         }
 403
 404         ret = sg_alloc_table(table, 1, GFP_KERNEL);
 405         if (ret)
 406                 goto out;
 407
 408         sg_set_page(table->sgl, page, len, 0);
 409
 410         buffer->priv_virt = table;
 411
 412         ion_pages_sync_for_device(NULL, page, len, DMA_BIDIRECTIONAL);
 413
 414         return 0;
 415
 416 out:
 417         for (i = 0; i < len >> PAGE_SHIFT; i++)
 418                 __free_page(page + i);
 419         kfree(table);
 420         return ret;
 421 }
 422
 423 static void ion_system_contig_heap_free(struct ion_buffer *buffer)
 424 {
 425         struct sg_table *table = buffer->priv_virt;
 426         struct page *page = sg_page(table->sgl);
 427         unsigned long pages = PAGE_ALIGN(buffer->size) >> PAGE_SHIFT;
 428         unsigned long i;
 429
 430         for (i = 0; i < pages; i++)
 431                 __free_page(page + i);
 432         sg_free_table(table);
 433         kfree(table);
 434 }
 435
 436 static int ion_system_contig_heap_phys(struct ion_heap *heap,
 437                                        struct ion_buffer *buffer,
 438                                        ion_phys_addr_t *addr, size_t *len)
 439 {
 440         struct sg_table *table = buffer->priv_virt;
 441         struct page *page = sg_page(table->sgl);
 442         *addr = page_to_phys(page);
 443         *len = buffer->size;
 444         return 0;
 445 }
 446
 447 static struct sg_table *ion_system_contig_heap_map_dma(struct ion_heap *heap,
 448                                                 struct ion_buffer *buffer)
 449 {
 450         return buffer->priv_virt;
 451 }
 452
 453 static void ion_system_contig_heap_unmap_dma(struct ion_heap *heap,
 454                                              struct ion_buffer *buffer)
 455 {
 456 }
 457
 458 static struct ion_heap_ops kmalloc_ops = {
 459         .allocate = ion_system_contig_heap_allocate,
 460         .free = ion_system_contig_heap_free,
 461         .phys = ion_system_contig_heap_phys,
 462         .map_dma = ion_system_contig_heap_map_dma,
 463         .unmap_dma = ion_system_contig_heap_unmap_dma,
 464         .map_kernel = ion_heap_map_kernel,
 465         .unmap_kernel = ion_heap_unmap_kernel,
 466         .map_user = ion_heap_map_user,
 467 };
 468
 469 struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *unused)
 470 {
 471         struct ion_heap *heap;
 472
 473         heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL);
 474         if (!heap)
 475                 return ERR_PTR(-ENOMEM);
 476         heap->ops = &kmalloc_ops;
 477         heap->type = ION_HEAP_TYPE_SYSTEM_CONTIG;
 478         return heap;
 479 }
 480
 481 void ion_system_contig_heap_destroy(struct ion_heap *heap)
 482 {
 483         kfree(heap);
 484 }
 485