1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2015, 2017, 2022 Linaro Limited
4 */
5#include <linux/device.h>
6#include <linux/dma-buf.h>
7#include <linux/genalloc.h>
8#include <linux/slab.h>
9#include <linux/tee_drv.h>
10#include "tee_private.h"
11
12static int pool_op_gen_alloc(struct tee_shm_pool *pool, struct tee_shm *shm,
13 size_t size, size_t align)
14{
15 unsigned long va;
16 struct gen_pool *genpool = pool->private_data;
17 size_t a = max_t(size_t, align, BIT(genpool->min_alloc_order));
18 struct genpool_data_align data = { .align = a };
19 size_t s = roundup(size, a);
20
21 va = gen_pool_alloc_algo(pool: genpool, size: s, algo: gen_pool_first_fit_align, data: &data);
22 if (!va)
23 return -ENOMEM;
24
25 memset((void *)va, 0, s);
26 shm->kaddr = (void *)va;
27 shm->paddr = gen_pool_virt_to_phys(pool: genpool, va);
28 shm->size = s;
29 /*
30 * This is from a static shared memory pool so no need to register
31 * each chunk, and no need to unregister later either.
32 */
33 shm->flags &= ~TEE_SHM_DYNAMIC;
34 return 0;
35}
36
37static void pool_op_gen_free(struct tee_shm_pool *pool, struct tee_shm *shm)
38{
39 gen_pool_free(pool: pool->private_data, addr: (unsigned long)shm->kaddr,
40 size: shm->size);
41 shm->kaddr = NULL;
42}
43
44static void pool_op_gen_destroy_pool(struct tee_shm_pool *pool)
45{
46 gen_pool_destroy(pool->private_data);
47 kfree(objp: pool);
48}
49
50static const struct tee_shm_pool_ops pool_ops_generic = {
51 .alloc = pool_op_gen_alloc,
52 .free = pool_op_gen_free,
53 .destroy_pool = pool_op_gen_destroy_pool,
54};
55
56struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr,
57 phys_addr_t paddr, size_t size,
58 int min_alloc_order)
59{
60 const size_t page_mask = PAGE_SIZE - 1;
61 struct tee_shm_pool *pool;
62 int rc;
63
64 /* Start and end must be page aligned */
65 if (vaddr & page_mask || paddr & page_mask || size & page_mask)
66 return ERR_PTR(error: -EINVAL);
67
68 pool = kzalloc(size: sizeof(*pool), GFP_KERNEL);
69 if (!pool)
70 return ERR_PTR(error: -ENOMEM);
71
72 pool->private_data = gen_pool_create(min_alloc_order, -1);
73 if (!pool->private_data) {
74 rc = -ENOMEM;
75 goto err;
76 }
77
78 rc = gen_pool_add_virt(pool: pool->private_data, addr: vaddr, phys: paddr, size, nid: -1);
79 if (rc) {
80 gen_pool_destroy(pool->private_data);
81 goto err;
82 }
83
84 pool->ops = &pool_ops_generic;
85
86 return pool;
87err:
88 kfree(objp: pool);
89
90 return ERR_PTR(error: rc);
91}
92EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
93

source code of linux/drivers/tee/tee_shm_pool.c