drivers/gpu/ion/ion_cma_heap.c

   1 /*
   2  * drivers/gpu/ion/ion_cma_heap.c
   3  *
   4  * Copyright (C) Linaro 2012
   5  * Author: <benjamin.gaignard@linaro.org> for ST-Ericsson.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/ion.h>
  20 #include <linux/slab.h>
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/dma-mapping.h>
  24
  25 /* for ion_heap_ops structure */
  26 #include "ion_priv.h"
  27
  28 #define ION_CMA_ALLOCATE_FAILED -1
  29 #define ION_IS_CACHED(__flags)  ((__flags) & ION_FLAG_CACHED)
  30
  31 struct ion_cma_heap {
  32         struct ion_heap heap;
  33         struct device *dev;
  34 };
  35
  36 #define to_cma_heap(x) container_of(x, struct ion_cma_heap, heap)
  37
  38 struct ion_cma_buffer_info {
  39         void *cpu_addr;
  40         dma_addr_t handle;
  41         struct sg_table *table;
  42         bool is_cached;
  43 };
  44
  45 /*
  46  * Create scatter-list for the already allocated DMA buffer.
  47  * This function could be replaced by dma_common_get_sgtable
  48  * as soon as it will avalaible.
  49  */
  50 int ion_cma_get_sgtable(struct device *dev, struct sg_table *sgt,
  51                         void *cpu_addr, dma_addr_t handle, size_t size)
  52 {
  53         struct page *page = virt_to_page(cpu_addr);
  54         int ret;
  55
  56         ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
  57         if (unlikely(ret))
  58                 return ret;
  59
  60         sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
  61         return 0;
  62 }
  63
  64 /* ION CMA heap operations functions */
  65 static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
  66                             unsigned long len, unsigned long align,
  67                             unsigned long flags)
  68 {
  69         struct ion_cma_heap *cma_heap = to_cma_heap(heap);
  70         struct device *dev = cma_heap->dev;
  71         struct ion_cma_buffer_info *info;
  72
  73         dev_dbg(dev, "Request buffer allocation len %ld\n", len);
  74
  75         info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL);
  76         if (!info) {
  77                 dev_err(dev, "Can't allocate buffer info\n");
  78                 return ION_CMA_ALLOCATE_FAILED;
  79         }
  80
  81         if (!ION_IS_CACHED(flags))
  82                 info->cpu_addr = dma_alloc_writecombine(dev, len,
  83                                 &(info->handle), GFP_KERNEL);
  84         else
  85                 info->cpu_addr = dma_alloc_nonconsistent(dev, len,
  86                                 &(info->handle), GFP_KERNEL);
  87
  88         if (!info->cpu_addr) {
  89                 dev_err(dev, "Fail to allocate buffer\n");
  90                 goto err;
  91         }
  92
  93         info->table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
  94         if (!info->table) {
  95                 dev_err(dev, "Fail to allocate sg table\n");
  96                 goto free_mem;
  97         }
  98
  99         info->is_cached = ION_IS_CACHED(flags);
 100
 101         if (ion_cma_get_sgtable
 102                         (dev, info->table, info->cpu_addr, info->handle, len))
 103                 goto free_table;
 104         /* keep this for memory release */
 105         buffer->priv_virt = info;
 106         dev_dbg(dev, "Allocate buffer %p\n", buffer);
 107         return 0;
 108
 109 free_table:
 110         kfree(info->table);
 111 free_mem:
 112         dma_free_coherent(dev, len, info->cpu_addr, info->handle);
 113 err:
 114         kfree(info);
 115         return ION_CMA_ALLOCATE_FAILED;
 116 }
 117
 118 static void ion_cma_free(struct ion_buffer *buffer)
 119 {
 120         struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
 121         struct device *dev = cma_heap->dev;
 122         struct ion_cma_buffer_info *info = buffer->priv_virt;
 123
 124         dev_dbg(dev, "Release buffer %p\n", buffer);
 125         /* release memory */
 126         dma_free_coherent(dev, buffer->size, info->cpu_addr, info->handle);
 127         /* release sg table */
 128         sg_free_table(info->table);
 129         kfree(info->table);
 130         kfree(info);
 131 }
 132
 133 /* return physical address in addr */
 134 static int ion_cma_phys(struct ion_heap *heap, struct ion_buffer *buffer,
 135                         ion_phys_addr_t *addr, size_t *len)
 136 {
 137         struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
 138         struct device *dev = cma_heap->dev;
 139         struct ion_cma_buffer_info *info = buffer->priv_virt;
 140
 141         dev_dbg(dev, "Return buffer %p physical address 0x%x\n", buffer,
 142                 info->handle);
 143
 144         *addr = info->handle;
 145         *len = buffer->size;
 146
 147         return 0;
 148 }
 149
 150 struct sg_table *ion_cma_heap_map_dma(struct ion_heap *heap,
 151                                          struct ion_buffer *buffer)
 152 {
 153         struct ion_cma_buffer_info *info = buffer->priv_virt;
 154
 155         return info->table;
 156 }
 157
 158 void ion_cma_heap_unmap_dma(struct ion_heap *heap,
 159                                struct ion_buffer *buffer)
 160 {
 161         return;
 162 }
 163
 164 static int ion_cma_mmap(struct ion_heap *mapper, struct ion_buffer *buffer,
 165                         struct vm_area_struct *vma)
 166 {
 167         struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
 168         struct device *dev = cma_heap->dev;
 169         struct ion_cma_buffer_info *info = buffer->priv_virt;
 170
 171         if (!info->is_cached)
 172                 return dma_mmap_writecombine(dev, vma, info->cpu_addr,
 173                                 info->handle, buffer->size);
 174         else
 175                 return dma_mmap_nonconsistent(dev, vma, info->cpu_addr,
 176                                 info->handle, buffer->size);
 177 }
 178
 179 void *ion_cma_map_kernel(struct ion_heap *heap, struct ion_buffer *buffer)
 180 {
 181         struct ion_cma_buffer_info *info = buffer->priv_virt;
 182         /* kernel memory mapping has been done at allocation time */
 183         return info->cpu_addr;
 184 }
 185
 186 static void ion_cma_unmap_kernel(struct ion_heap *heap,
 187                                         struct ion_buffer *buffer)
 188 {
 189 }
 190 static struct ion_heap_ops ion_cma_ops = {
 191         .allocate = ion_cma_allocate,
 192         .free = ion_cma_free,
 193         .map_dma = ion_cma_heap_map_dma,
 194         .unmap_dma = ion_cma_heap_unmap_dma,
 195         .phys = ion_cma_phys,
 196         .map_user = ion_cma_mmap,
 197         .map_kernel = ion_cma_map_kernel,
 198         .unmap_kernel = ion_cma_unmap_kernel,
 199 };
 200
 201 struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *data, struct device *dev)
 202 {
 203         struct ion_cma_heap *cma_heap;
 204         uint64_t sprd_dmamask = DMA_BIT_MASK(32);
 205         cma_heap = kzalloc(sizeof(struct ion_cma_heap), GFP_KERNEL);
 206
 207         if (!cma_heap)
 208                 return ERR_PTR(-ENOMEM);
 209
 210         cma_heap->heap.ops = &ion_cma_ops;
 211         /* get device from private heaps data, later it will be
 212          * used to make the link with reserved CMA memory */
 213         dev->dma_mask = &sprd_dmamask;
 214         dev->coherent_dma_mask = DMA_BIT_MASK(32);
 215         cma_heap->dev = dev;
 216         cma_heap->heap.type = ION_HEAP_TYPE_DMA;
 217         return &cma_heap->heap;
 218 }
 219
 220 void ion_cma_heap_destroy(struct ion_heap *heap)
 221 {
 222         struct ion_cma_heap *cma_heap = to_cma_heap(heap);
 223
 224         kfree(cma_heap);
 225 }