drivers/staging/android/ion/ion_system_heap.c

   1 /*
   2  * drivers/staging/android/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/slab.h>
  24 #include <linux/vmalloc.h>
  25 #include "ion.h"
  26 #include "ion_priv.h"
  27
  28 struct page_info {
  29         struct page *page;
  30         unsigned long order;
  31         struct list_head list;
  32 };
  33
  34 static unsigned int orders[] = {8, 4, 0};
  35
  36 static struct page_info *alloc_largest_available(unsigned long size,
  37                                                  bool split_pages,
  38                                                  unsigned int max_order)
  39 {
  40         struct page *page;
  41         struct page_info *info;
  42         int i;
  43
  44         for (i = 0; i < ARRAY_SIZE(orders); i++) {
  45                 if (size < (1 << orders[i]) * PAGE_SIZE)
  46                         continue;
  47                 if (max_order < orders[i])
  48                         continue;
  49                 page = alloc_pages(GFP_HIGHUSER | __GFP_ZERO |
  50                                    __GFP_NOWARN | __GFP_NORETRY, orders[i]);
  51                 if (!page)
  52                         continue;
  53                 if (split_pages)
  54                         split_page(page, orders[i]);
  55                 info = kmalloc(sizeof(struct page_info *), GFP_KERNEL);
  56                 info->page = page;
  57                 info->order = orders[i];
  58                 return info;
  59         }
  60         return NULL;
  61 }
  62
  63 static int ion_system_heap_allocate(struct ion_heap *heap,
  64                                      struct ion_buffer *buffer,
  65                                      unsigned long size, unsigned long align,
  66                                      unsigned long flags)
  67 {
  68         struct sg_table *table;
  69         struct scatterlist *sg;
  70         int ret;
  71         struct list_head pages;
  72         struct page_info *info, *tmp_info;
  73         int i = 0;
  74         long size_remaining = PAGE_ALIGN(size);
  75         bool split_pages = ion_buffer_fault_user_mappings(buffer);
  76
  77
  78         unsigned int max_order = orders[0];
  79
  80         INIT_LIST_HEAD(&pages);
  81         while (size_remaining > 0) {
  82                 info = alloc_largest_available(size_remaining, split_pages,
  83                                                max_order);
  84                 if (!info)
  85                         goto err;
  86                 list_add_tail(&info->list, &pages);
  87                 size_remaining -= (1 << info->order) * PAGE_SIZE;
  88                 max_order = info->order;
  89                 i++;
  90         }
  91
  92         table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
  93         if (!table)
  94                 goto err;
  95
  96         if (split_pages)
  97                 ret = sg_alloc_table(table, PAGE_ALIGN(size) / PAGE_SIZE,
  98                                      GFP_KERNEL);
  99         else
 100                 ret = sg_alloc_table(table, i, GFP_KERNEL);
 101
 102         if (ret)
 103                 goto err1;
 104
 105         sg = table->sgl;
 106         list_for_each_entry_safe(info, tmp_info, &pages, list) {
 107                 struct page *page = info->page;
 108
 109                 if (split_pages) {
 110                         for (i = 0; i < (1 << info->order); i++) {
 111                                 sg_set_page(sg, page + i, PAGE_SIZE, 0);
 112                                 sg = sg_next(sg);
 113                         }
 114                 } else {
 115                         sg_set_page(sg, page, (1 << info->order) * PAGE_SIZE,
 116                                     0);
 117                         sg = sg_next(sg);
 118                 }
 119                 list_del(&info->list);
 120                 kfree(info);
 121         }
 122
 123         dma_sync_sg_for_device(NULL, table->sgl, table->nents,
 124                                DMA_BIDIRECTIONAL);
 125
 126         buffer->priv_virt = table;
 127         return 0;
 128 err1:
 129         kfree(table);
 130 err:
 131         list_for_each_entry(info, &pages, list) {
 132                 if (split_pages)
 133                         for (i = 0; i < (1 << info->order); i++)
 134                                 __free_page(info->page + i);
 135                 else
 136                         __free_pages(info->page, info->order);
 137
 138                 kfree(info);
 139         }
 140         return -ENOMEM;
 141 }
 142
 143 void ion_system_heap_free(struct ion_buffer *buffer)
 144 {
 145         int i;
 146         struct scatterlist *sg;
 147         struct sg_table *table = buffer->priv_virt;
 148
 149         for_each_sg(table->sgl, sg, table->nents, i)
 150                 __free_pages(sg_page(sg), get_order(sg_dma_len(sg)));
 151         if (buffer->sg_table)
 152                 sg_free_table(buffer->sg_table);
 153         kfree(buffer->sg_table);
 154 }
 155
 156 struct sg_table *ion_system_heap_map_dma(struct ion_heap *heap,
 157                                          struct ion_buffer *buffer)
 158 {
 159         return buffer->priv_virt;
 160 }
 161
 162 void ion_system_heap_unmap_dma(struct ion_heap *heap,
 163                                struct ion_buffer *buffer)
 164 {
 165         return;
 166 }
 167
 168 void *ion_system_heap_map_kernel(struct ion_heap *heap,
 169                                  struct ion_buffer *buffer)
 170 {
 171         struct scatterlist *sg;
 172         int i, j;
 173         void *vaddr;
 174         pgprot_t pgprot;
 175         struct sg_table *table = buffer->priv_virt;
 176         int npages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
 177         struct page **pages = kzalloc(sizeof(struct page *) * npages,
 178                                      GFP_KERNEL);
 179         struct page **tmp = pages;
 180
 181         if (buffer->flags & ION_FLAG_CACHED)
 182                 pgprot = PAGE_KERNEL;
 183         else
 184                 pgprot = pgprot_writecombine(PAGE_KERNEL);
 185
 186         for_each_sg(table->sgl, sg, table->nents, i) {
 187                 int npages_this_entry = PAGE_ALIGN(sg_dma_len(sg)) / PAGE_SIZE;
 188                 struct page *page = sg_page(sg);
 189                 BUG_ON(i >= npages);
 190                 for (j = 0; j < npages_this_entry; j++) {
 191                         *(tmp++) = page++;
 192                 }
 193         }
 194         vaddr = vmap(pages, npages, VM_MAP, pgprot);
 195         kfree(pages);
 196
 197         return vaddr;
 198 }
 199
 200 void ion_system_heap_unmap_kernel(struct ion_heap *heap,
 201                                   struct ion_buffer *buffer)
 202 {
 203         vunmap(buffer->vaddr);
 204 }
 205
 206 int ion_system_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
 207                              struct vm_area_struct *vma)
 208 {
 209         struct sg_table *table = buffer->priv_virt;
 210         unsigned long addr = vma->vm_start;
 211         unsigned long offset = vma->vm_pgoff;
 212         struct scatterlist *sg;
 213         int i;
 214
 215         for_each_sg(table->sgl, sg, table->nents, i) {
 216                 if (offset) {
 217                         offset--;
 218                         continue;
 219                 }
 220                 remap_pfn_range(vma, addr, page_to_pfn(sg_page(sg)),
 221                                 sg_dma_len(sg), vma->vm_page_prot);
 222                 addr += sg_dma_len(sg);
 223                 if (addr >= vma->vm_end)
 224                         return 0;
 225         }
 226         return 0;
 227 }
 228
 229 static struct ion_heap_ops vmalloc_ops = {
 230         .allocate = ion_system_heap_allocate,
 231         .free = ion_system_heap_free,
 232         .map_dma = ion_system_heap_map_dma,
 233         .unmap_dma = ion_system_heap_unmap_dma,
 234         .map_kernel = ion_system_heap_map_kernel,
 235         .unmap_kernel = ion_system_heap_unmap_kernel,
 236         .map_user = ion_system_heap_map_user,
 237 };
 238
 239 struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
 240 {
 241         struct ion_heap *heap;
 242
 243         heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL);
 244         if (!heap)
 245                 return ERR_PTR(-ENOMEM);
 246         heap->ops = &vmalloc_ops;
 247         heap->type = ION_HEAP_TYPE_SYSTEM;
 248         return heap;
 249 }
 250
 251 void ion_system_heap_destroy(struct ion_heap *heap)
 252 {
 253         kfree(heap);
 254 }
 255
 256 static int ion_system_contig_heap_allocate(struct ion_heap *heap,
 257                                            struct ion_buffer *buffer,
 258                                            unsigned long len,
 259                                            unsigned long align,
 260                                            unsigned long flags)
 261 {
 262         buffer->priv_virt = kzalloc(len, GFP_KERNEL);
 263         if (!buffer->priv_virt)
 264                 return -ENOMEM;
 265         return 0;
 266 }
 267
 268 void ion_system_contig_heap_free(struct ion_buffer *buffer)
 269 {
 270         kfree(buffer->priv_virt);
 271 }
 272
 273 static int ion_system_contig_heap_phys(struct ion_heap *heap,
 274                                        struct ion_buffer *buffer,
 275                                        ion_phys_addr_t *addr, size_t *len)
 276 {
 277         *addr = virt_to_phys(buffer->priv_virt);
 278         *len = buffer->size;
 279         return 0;
 280 }
 281
 282 struct sg_table *ion_system_contig_heap_map_dma(struct ion_heap *heap,
 283                                                 struct ion_buffer *buffer)
 284 {
 285         struct sg_table *table;
 286         int ret;
 287
 288         table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
 289         if (!table)
 290                 return ERR_PTR(-ENOMEM);
 291         ret = sg_alloc_table(table, 1, GFP_KERNEL);
 292         if (ret) {
 293                 kfree(table);
 294                 return ERR_PTR(ret);
 295         }
 296         sg_set_page(table->sgl, virt_to_page(buffer->priv_virt), buffer->size,
 297                     0);
 298         return table;
 299 }
 300
 301 void ion_system_contig_heap_unmap_dma(struct ion_heap *heap,
 302                                       struct ion_buffer *buffer)
 303 {
 304         sg_free_table(buffer->sg_table);
 305         kfree(buffer->sg_table);
 306 }
 307
 308 int ion_system_contig_heap_map_user(struct ion_heap *heap,
 309                                     struct ion_buffer *buffer,
 310                                     struct vm_area_struct *vma)
 311 {
 312         unsigned long pfn = __phys_to_pfn(virt_to_phys(buffer->priv_virt));
 313         return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
 314                                vma->vm_end - vma->vm_start,
 315                                vma->vm_page_prot);
 316
 317 }
 318
 319 static struct ion_heap_ops kmalloc_ops = {
 320         .allocate = ion_system_contig_heap_allocate,
 321         .free = ion_system_contig_heap_free,
 322         .phys = ion_system_contig_heap_phys,
 323         .map_dma = ion_system_contig_heap_map_dma,
 324         .unmap_dma = ion_system_contig_heap_unmap_dma,
 325         .map_kernel = ion_system_heap_map_kernel,
 326         .unmap_kernel = ion_system_heap_unmap_kernel,
 327         .map_user = ion_system_contig_heap_map_user,
 328 };
 329
 330 struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *unused)
 331 {
 332         struct ion_heap *heap;
 333
 334         heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL);
 335         if (!heap)
 336                 return ERR_PTR(-ENOMEM);
 337         heap->ops = &kmalloc_ops;
 338         heap->type = ION_HEAP_TYPE_SYSTEM_CONTIG;
 339         return heap;
 340 }
 341
 342 void ion_system_contig_heap_destroy(struct ion_heap *heap)
 343 {
 344         kfree(heap);
 345 }
 346