2 * drivers/gpu/ion/ion_cma_heap.c
4 * Copyright (C) Linaro 2012
5 * Author: <benjamin.gaignard@linaro.org> for ST-Ericsson.
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.
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.
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>
25 /* for ion_heap_ops structure */
28 #define ION_CMA_ALLOCATE_FAILED -1
29 #define ION_IS_CACHED(__flags) ((__flags) & ION_FLAG_CACHED)
36 #define to_cma_heap(x) container_of(x, struct ion_cma_heap, heap)
38 struct ion_cma_buffer_info {
41 struct sg_table *table;
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.
50 int ion_cma_get_sgtable(struct device *dev, struct sg_table *sgt,
51 void *cpu_addr, dma_addr_t handle, size_t size)
53 struct page *page = virt_to_page(cpu_addr);
56 ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
60 sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
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,
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;
73 dev_dbg(dev, "Request buffer allocation len %ld\n", len);
75 info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL);
77 dev_err(dev, "Can't allocate buffer info\n");
78 return ION_CMA_ALLOCATE_FAILED;
81 if (!ION_IS_CACHED(flags))
82 info->cpu_addr = dma_alloc_writecombine(dev, len,
83 &(info->handle), GFP_KERNEL);
85 info->cpu_addr = dma_alloc_nonconsistent(dev, len,
86 &(info->handle), GFP_KERNEL);
88 if (!info->cpu_addr) {
89 dev_err(dev, "Fail to allocate buffer\n");
93 info->table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
95 dev_err(dev, "Fail to allocate sg table\n");
99 info->is_cached = ION_IS_CACHED(flags);
101 if (ion_cma_get_sgtable
102 (dev, info->table, info->cpu_addr, info->handle, len))
104 /* keep this for memory release */
105 buffer->priv_virt = info;
106 dev_dbg(dev, "Allocate buffer %p\n", buffer);
112 dma_free_coherent(dev, len, info->cpu_addr, info->handle);
115 return ION_CMA_ALLOCATE_FAILED;
118 static void ion_cma_free(struct ion_buffer *buffer)
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;
124 dev_dbg(dev, "Release buffer %p\n", buffer);
126 dma_free_coherent(dev, buffer->size, info->cpu_addr, info->handle);
127 /* release sg table */
128 sg_free_table(info->table);
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)
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;
141 dev_dbg(dev, "Return buffer %p physical address 0x%x\n", buffer,
144 *addr = info->handle;
150 struct sg_table *ion_cma_heap_map_dma(struct ion_heap *heap,
151 struct ion_buffer *buffer)
153 struct ion_cma_buffer_info *info = buffer->priv_virt;
158 void ion_cma_heap_unmap_dma(struct ion_heap *heap,
159 struct ion_buffer *buffer)
164 static int ion_cma_mmap(struct ion_heap *mapper, struct ion_buffer *buffer,
165 struct vm_area_struct *vma)
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;
171 if (!info->is_cached)
172 return dma_mmap_writecombine(dev, vma, info->cpu_addr,
173 info->handle, buffer->size);
175 return dma_mmap_nonconsistent(dev, vma, info->cpu_addr,
176 info->handle, buffer->size);
179 void *ion_cma_map_kernel(struct ion_heap *heap, struct ion_buffer *buffer)
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;
186 static void ion_cma_unmap_kernel(struct ion_heap *heap,
187 struct ion_buffer *buffer)
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,
201 struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *data, struct device *dev)
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);
208 return ERR_PTR(-ENOMEM);
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);
216 cma_heap->heap.type = ION_HEAP_TYPE_DMA;
217 return &cma_heap->heap;
220 void ion_cma_heap_destroy(struct ion_heap *heap)
222 struct ion_cma_heap *cma_heap = to_cma_heap(heap);