drivers/staging/android/ion/ion_chunk_heap.c

   1 /*
   2  * drivers/staging/android/ion/ion_chunk_heap.c
   3  *
   4  * Copyright (C) 2012 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 //#include <linux/spinlock.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/err.h>
  19 #include <linux/genalloc.h>
  20 #include <linux/io.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 #include <asm/mach/map.h>
  29
  30 struct ion_chunk_heap {
  31         struct ion_heap heap;
  32         struct gen_pool *pool;
  33         ion_phys_addr_t base;
  34         unsigned long chunk_size;
  35         unsigned long size;
  36         unsigned long allocated;
  37 };
  38
  39 static int ion_chunk_heap_allocate(struct ion_heap *heap,
  40                                       struct ion_buffer *buffer,
  41                                       unsigned long size, unsigned long align,
  42                                       unsigned long flags)
  43 {
  44         struct ion_chunk_heap *chunk_heap =
  45                 container_of(heap, struct ion_chunk_heap, heap);
  46         struct sg_table *table;
  47         struct scatterlist *sg;
  48         int ret, i;
  49         unsigned long num_chunks;
  50         unsigned long allocated_size;
  51
  52         if (ion_buffer_fault_user_mappings(buffer))
  53                 return -ENOMEM;
  54
  55         allocated_size = ALIGN(size, chunk_heap->chunk_size);
  56         num_chunks = allocated_size / chunk_heap->chunk_size;
  57
  58         if (allocated_size > chunk_heap->size - chunk_heap->allocated)
  59                 return -ENOMEM;
  60
  61         table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
  62         if (!table)
  63                 return -ENOMEM;
  64         ret = sg_alloc_table(table, num_chunks, GFP_KERNEL);
  65         if (ret) {
  66                 kfree(table);
  67                 return ret;
  68         }
  69
  70         sg = table->sgl;
  71         for (i = 0; i < num_chunks; i++) {
  72                 unsigned long paddr = gen_pool_alloc(chunk_heap->pool,
  73                                                      chunk_heap->chunk_size);
  74                 if (!paddr)
  75                         goto err;
  76                 sg_set_page(sg, phys_to_page(paddr), chunk_heap->chunk_size, 0);
  77                 sg = sg_next(sg);
  78         }
  79
  80         buffer->priv_virt = table;
  81         chunk_heap->allocated += allocated_size;
  82         return 0;
  83 err:
  84         sg = table->sgl;
  85         for (i -= 1; i >= 0; i--) {
  86                 gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
  87                               sg->length);
  88                 sg = sg_next(sg);
  89         }
  90         sg_free_table(table);
  91         kfree(table);
  92         return -ENOMEM;
  93 }
  94
  95 static void ion_chunk_heap_free(struct ion_buffer *buffer)
  96 {
  97         struct ion_heap *heap = buffer->heap;
  98         struct ion_chunk_heap *chunk_heap =
  99                 container_of(heap, struct ion_chunk_heap, heap);
 100         struct sg_table *table = buffer->priv_virt;
 101         struct scatterlist *sg;
 102         int i;
 103         unsigned long allocated_size;
 104
 105         allocated_size = ALIGN(buffer->size, chunk_heap->chunk_size);
 106
 107         ion_heap_buffer_zero(buffer);
 108
 109         if (ion_buffer_cached(buffer))
 110                 dma_sync_sg_for_device(NULL, table->sgl, table->nents,
 111                                                                 DMA_BIDIRECTIONAL);
 112
 113         for_each_sg(table->sgl, sg, table->nents, i) {
 114                 gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
 115                               sg->length);
 116         }
 117         chunk_heap->allocated -= allocated_size;
 118         sg_free_table(table);
 119         kfree(table);
 120 }
 121
 122 struct sg_table *ion_chunk_heap_map_dma(struct ion_heap *heap,
 123                                          struct ion_buffer *buffer)
 124 {
 125         return buffer->priv_virt;
 126 }
 127
 128 void ion_chunk_heap_unmap_dma(struct ion_heap *heap,
 129                                struct ion_buffer *buffer)
 130 {
 131         return;
 132 }
 133
 134 static struct ion_heap_ops chunk_heap_ops = {
 135         .allocate = ion_chunk_heap_allocate,
 136         .free = ion_chunk_heap_free,
 137         .map_dma = ion_chunk_heap_map_dma,
 138         .unmap_dma = ion_chunk_heap_unmap_dma,
 139         .map_user = ion_heap_map_user,
 140         .map_kernel = ion_heap_map_kernel,
 141         .unmap_kernel = ion_heap_unmap_kernel,
 142 };
 143
 144 struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data)
 145 {
 146         struct ion_chunk_heap *chunk_heap;
 147         struct vm_struct *vm_struct;
 148         pgprot_t pgprot = pgprot_writecombine(PAGE_KERNEL);
 149         int i, ret;
 150
 151         chunk_heap = kzalloc(sizeof(struct ion_chunk_heap), GFP_KERNEL);
 152         if (!chunk_heap)
 153                 return ERR_PTR(-ENOMEM);
 154
 155         chunk_heap->chunk_size = (unsigned long)heap_data->priv;
 156         chunk_heap->pool = gen_pool_create(get_order(chunk_heap->chunk_size) +
 157                                            PAGE_SHIFT, -1);
 158         if (!chunk_heap->pool) {
 159                 ret = -ENOMEM;
 160                 goto error_gen_pool_create;
 161         }
 162         chunk_heap->base = heap_data->base;
 163         chunk_heap->size = heap_data->size;
 164         chunk_heap->allocated = 0;
 165
 166         vm_struct = get_vm_area(PAGE_SIZE, VM_ALLOC);
 167         if (!vm_struct) {
 168                 ret = -ENOMEM;
 169                 goto error;
 170         }
 171         for (i = 0; i < chunk_heap->size; i += PAGE_SIZE) {
 172                 struct page *page = phys_to_page(chunk_heap->base + i);
 173                 struct page **pages = &page;
 174
 175                 ret = map_vm_area(vm_struct, pgprot, &pages);
 176                 if (ret)
 177                         goto error_map_vm_area;
 178                 memset(vm_struct->addr, 0, PAGE_SIZE);
 179                 unmap_kernel_range((unsigned long)vm_struct->addr, PAGE_SIZE);
 180         }
 181         free_vm_area(vm_struct);
 182
 183         ion_pages_sync_for_device(NULL, pfn_to_page(PFN_DOWN(heap_data->base)),
 184                         heap_data->size, DMA_BIDIRECTIONAL);
 185
 186         gen_pool_add(chunk_heap->pool, chunk_heap->base, heap_data->size, -1);
 187         chunk_heap->heap.ops = &chunk_heap_ops;
 188         chunk_heap->heap.type = ION_HEAP_TYPE_CHUNK;
 189         chunk_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
 190         pr_info("%s: base %lu size %u align %ld\n", __func__, chunk_heap->base,
 191                 heap_data->size, heap_data->align);
 192
 193         return &chunk_heap->heap;
 194
 195 error_map_vm_area:
 196         free_vm_area(vm_struct);
 197 error:
 198         gen_pool_destroy(chunk_heap->pool);
 199 error_gen_pool_create:
 200         kfree(chunk_heap);
 201         return ERR_PTR(ret);
 202 }
 203
 204 void ion_chunk_heap_destroy(struct ion_heap *heap)
 205 {
 206         struct ion_chunk_heap *chunk_heap =
 207              container_of(heap, struct  ion_chunk_heap, heap);
 208
 209         gen_pool_destroy(chunk_heap->pool);
 210         kfree(chunk_heap);
 211         chunk_heap = NULL;
 212 }