aboutsummaryrefslogtreecommitdiff
path: root/drivers/staging/android/ion/ion_cma_heap.c
blob: 55d6003f546c6fa7ed9567ebc6b4d0cbdd42da8a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
/*
 * drivers/gpu/ion/ion_cma_heap.c
 *
 * Copyright (C) Linaro 2012
 * Author: <benjamin.gaignard@linaro.org> for ST-Ericsson.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/device.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/dma-mapping.h>

#include "ion.h"
#include "ion_priv.h"

#define ION_CMA_ALLOCATE_FAILED -1

struct ion_cma_heap {
	struct ion_heap heap;
	struct device *dev;
};

#define to_cma_heap(x) container_of(x, struct ion_cma_heap, heap)

struct ion_cma_buffer_info {
	void *cpu_addr;
	dma_addr_t handle;
	struct sg_table *table;
};

/*
 * Create scatter-list for the already allocated DMA buffer.
 * This function could be replaced by dma_common_get_sgtable
 * as soon as it will avalaible.
 */
int ion_cma_get_sgtable(struct device *dev, struct sg_table *sgt,
			void *cpu_addr, dma_addr_t handle, size_t size)
{
	struct page *page = virt_to_page(cpu_addr);
	int ret;

	ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
	if (unlikely(ret))
		return ret;

	sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
	return 0;
}

/* ION CMA heap operations functions */
static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
			    unsigned long len, unsigned long align,
			    unsigned long flags)
{
	struct ion_cma_heap *cma_heap = to_cma_heap(heap);
	struct device *dev = cma_heap->dev;
	struct ion_cma_buffer_info *info;

	dev_dbg(dev, "Request buffer allocation len %ld\n", len);

	info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL);
	if (!info) {
		dev_err(dev, "Can't allocate buffer info\n");
		return ION_CMA_ALLOCATE_FAILED;
	}

	info->cpu_addr = dma_alloc_coherent(dev, len, &(info->handle), 0);

	if (!info->cpu_addr) {
		dev_err(dev, "Fail to allocate buffer\n");
		goto err;
	}

	info->table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
	if (!info->table) {
		dev_err(dev, "Fail to allocate sg table\n");
		goto free_mem;
	}

	if (ion_cma_get_sgtable
	    (dev, info->table, info->cpu_addr, info->handle, len))
		goto free_table;
	/* keep this for memory release */
	buffer->priv_virt = info;
	dev_dbg(dev, "Allocate buffer %p\n", buffer);
	return 0;

free_table:
	kfree(info->table);
free_mem:
	dma_free_coherent(dev, len, info->cpu_addr, info->handle);
err:
	kfree(info);
	return ION_CMA_ALLOCATE_FAILED;
}

static void ion_cma_free(struct ion_buffer *buffer)
{
	struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
	struct device *dev = cma_heap->dev;
	struct ion_cma_buffer_info *info = buffer->priv_virt;

	dev_dbg(dev, "Release buffer %p\n", buffer);
	/* release memory */
	dma_free_coherent(dev, buffer->size, info->cpu_addr, info->handle);
	/* release sg table */
	sg_free_table(info->table);
	kfree(info->table);
	kfree(info);
}

/* return physical address in addr */
static int ion_cma_phys(struct ion_heap *heap, struct ion_buffer *buffer,
			ion_phys_addr_t *addr, size_t *len)
{
	struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
	struct device *dev = cma_heap->dev;
	struct ion_cma_buffer_info *info = buffer->priv_virt;

	dev_dbg(dev, "Return buffer %p physical address 0x%x\n", buffer,
		info->handle);

	*addr = info->handle;
	*len = buffer->size;

	return 0;
}

struct sg_table *ion_cma_heap_map_dma(struct ion_heap *heap,
					 struct ion_buffer *buffer)
{
	struct ion_cma_buffer_info *info = buffer->priv_virt;

	return info->table;
}

void ion_cma_heap_unmap_dma(struct ion_heap *heap,
			       struct ion_buffer *buffer)
{
	return;
}

static int ion_cma_mmap(struct ion_heap *mapper, struct ion_buffer *buffer,
			struct vm_area_struct *vma)
{
	struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
	struct device *dev = cma_heap->dev;
	struct ion_cma_buffer_info *info = buffer->priv_virt;

	return dma_mmap_coherent(dev, vma, info->cpu_addr, info->handle,
				 buffer->size);
}

void *ion_cma_map_kernel(struct ion_heap *heap, struct ion_buffer *buffer)
{
	struct ion_cma_buffer_info *info = buffer->priv_virt;
	/* kernel memory mapping has been done at allocation time */
	return info->cpu_addr;
}

static struct ion_heap_ops ion_cma_ops = {
	.allocate = ion_cma_allocate,
	.free = ion_cma_free,
	.map_dma = ion_cma_heap_map_dma,
	.unmap_dma = ion_cma_heap_unmap_dma,
	.phys = ion_cma_phys,
	.map_user = ion_cma_mmap,
	.map_kernel = ion_cma_map_kernel,
};

struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *data)
{
	struct ion_cma_heap *cma_heap;

	cma_heap = kzalloc(sizeof(struct ion_cma_heap), GFP_KERNEL);

	if (!cma_heap)
		return ERR_PTR(-ENOMEM);

	cma_heap->heap.ops = &ion_cma_ops;
	/* get device from private heaps data, later it will be
	 * used to make the link with reserved CMA memory */
	cma_heap->dev = data->priv;
	cma_heap->heap.type = ION_HEAP_TYPE_DMA;
	return &cma_heap->heap;
}

void ion_cma_heap_destroy(struct ion_heap *heap)
{
	struct ion_cma_heap *cma_heap = to_cma_heap(heap);

	kfree(cma_heap);
}