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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - drivers/staging/android/ion/ion_cma_heap.c
2 * drivers/staging/android/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/slab.h>
20 #include <linux/errno.h>
21 #include <linux/err.h>
22 #include <linux/cma.h>
23 #include <linux/scatterlist.h>
32 #define to_cma_heap(x) container_of(x, struct ion_cma_heap, heap)
34 /* ION CMA heap operations functions */
35 static int ion_cma_allocate(struct ion_heap
*heap
, struct ion_buffer
*buffer
,
39 struct ion_cma_heap
*cma_heap
= to_cma_heap(heap
);
40 struct sg_table
*table
;
42 unsigned long size
= PAGE_ALIGN(len
);
43 unsigned long nr_pages
= size
>> PAGE_SHIFT
;
44 unsigned long align
= get_order(size
);
47 if (align
> CONFIG_CMA_ALIGNMENT
)
48 align
= CONFIG_CMA_ALIGNMENT
;
50 pages
= cma_alloc(cma_heap
->cma
, nr_pages
, align
, GFP_KERNEL
);
54 table
= kmalloc(sizeof(*table
), GFP_KERNEL
);
58 ret
= sg_alloc_table(table
, 1, GFP_KERNEL
);
62 sg_set_page(table
->sgl
, pages
, size
, 0);
64 buffer
->priv_virt
= pages
;
65 buffer
->sg_table
= table
;
71 cma_release(cma_heap
->cma
, pages
, nr_pages
);
75 static void ion_cma_free(struct ion_buffer
*buffer
)
77 struct ion_cma_heap
*cma_heap
= to_cma_heap(buffer
->heap
);
78 struct page
*pages
= buffer
->priv_virt
;
79 unsigned long nr_pages
= PAGE_ALIGN(buffer
->size
) >> PAGE_SHIFT
;
82 cma_release(cma_heap
->cma
, pages
, nr_pages
);
83 /* release sg table */
84 sg_free_table(buffer
->sg_table
);
85 kfree(buffer
->sg_table
);
88 static struct ion_heap_ops ion_cma_ops
= {
89 .allocate
= ion_cma_allocate
,
91 .map_user
= ion_heap_map_user
,
92 .map_kernel
= ion_heap_map_kernel
,
93 .unmap_kernel
= ion_heap_unmap_kernel
,
96 static struct ion_heap
*__ion_cma_heap_create(struct cma
*cma
)
98 struct ion_cma_heap
*cma_heap
;
100 cma_heap
= kzalloc(sizeof(*cma_heap
), GFP_KERNEL
);
103 return ERR_PTR(-ENOMEM
);
105 cma_heap
->heap
.ops
= &ion_cma_ops
;
107 * get device from private heaps data, later it will be
108 * used to make the link with reserved CMA memory
111 cma_heap
->heap
.type
= ION_HEAP_TYPE_DMA
;
112 return &cma_heap
->heap
;
115 static int __ion_add_cma_heaps(struct cma
*cma
, void *data
)
117 struct ion_heap
*heap
;
119 heap
= __ion_cma_heap_create(cma
);
121 return PTR_ERR(heap
);
123 heap
->name
= cma_get_name(cma
);
125 ion_device_add_heap(heap
);
129 static int ion_add_cma_heaps(void)
131 cma_for_each_area(__ion_add_cma_heaps
, NULL
);
134 device_initcall(ion_add_cma_heaps
);