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(genpool, s, gen_pool_first_fit_align, &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(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->private_data, (unsigned long)shm->kaddr,
40		      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(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(-EINVAL);
67
68	pool = kzalloc(sizeof(*pool), GFP_KERNEL);
69	if (!pool)
70		return ERR_PTR(-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->private_data, vaddr, paddr, size, -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(pool);
89
90	return ERR_PTR(rc);
91}
92EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
93