tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2015, Linaro Limited
4 * Copyright (c) 2017, EPAM Systems
5 */
6#include <linux/device.h>
7#include <linux/dma-buf.h>
8#include <linux/genalloc.h>
9#include <linux/slab.h>
10#include <linux/tee_drv.h>
11#include "optee_private.h"
12#include "optee_smc.h"
13#include "shm_pool.h"
14
15static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
16 struct tee_shm *shm, size_t size)
17{
18 unsigned int order = get_order(size);
19 struct page *page;
20
21 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
22 if (!page)
23 return -ENOMEM;
24
25 shm->kaddr = page_address(page);
26 shm->paddr = page_to_phys(page);
27 shm->size = PAGE_SIZE << order;
28
29 return 0;
30}
31
32static void pool_op_free(struct tee_shm_pool_mgr *poolm,
33 struct tee_shm *shm)
34{
35 free_pages((unsigned long)shm->kaddr, get_order(shm->size));
36 shm->kaddr = NULL;
37}
38
39static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
40{
41 kfree(poolm);
42}
43
44static const struct tee_shm_pool_mgr_ops pool_ops = {
45 .alloc = pool_op_alloc,
46 .free = pool_op_free,
47 .destroy_poolmgr = pool_op_destroy_poolmgr,
48};
49
50/**
51 * optee_shm_pool_alloc_pages() - create page-based allocator pool
52 *
53 * This pool is used when OP-TEE supports dymanic SHM. In this case
54 * command buffers and such are allocated from kernel's own memory.
55 */
56struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)
57{
58 struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
59
60 if (!mgr)
61 return ERR_PTR(-ENOMEM);
62
63 mgr->ops = &pool_ops;
64
65 return mgr;
66}