Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: fcbb461fc59c4469fb429156296f6b0f8e4d78e9 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015, Linaro Limited
 */
#include <linux/device.h>
#include <linux/dma-buf.h>
#include <linux/genalloc.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include "tee_private.h"

static int pool_op_gen_alloc(struct tee_shm_pool_mgr *poolm,
			     struct tee_shm *shm, size_t size)
{
	unsigned long va;
	struct gen_pool *genpool = poolm->private_data;
	size_t s = roundup(size, 1 << genpool->min_alloc_order);

	va = gen_pool_alloc(genpool, s);
	if (!va)
		return -ENOMEM;

	memset((void *)va, 0, s);
	shm->kaddr = (void *)va;
	shm->paddr = gen_pool_virt_to_phys(genpool, va);
	shm->size = s;
	return 0;
}

static void pool_op_gen_free(struct tee_shm_pool_mgr *poolm,
			     struct tee_shm *shm)
{
	gen_pool_free(poolm->private_data, (unsigned long)shm->kaddr,
		      shm->size);
	shm->kaddr = NULL;
}

static void pool_op_gen_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
{
	gen_pool_destroy(poolm->private_data);
	kfree(poolm);
}

static const struct tee_shm_pool_mgr_ops pool_ops_generic = {
	.alloc = pool_op_gen_alloc,
	.free = pool_op_gen_free,
	.destroy_poolmgr = pool_op_gen_destroy_poolmgr,
};

/**
 * tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved
 * memory range
 * @priv_info:	Information for driver private shared memory pool
 * @dmabuf_info: Information for dma-buf shared memory pool
 *
 * Start and end of pools will must be page aligned.
 *
 * Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
 * in @dmabuf, others will use the range provided by @priv.
 *
 * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
 */
struct tee_shm_pool *
tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info,
			   struct tee_shm_pool_mem_info *dmabuf_info)
{
	struct tee_shm_pool_mgr *priv_mgr;
	struct tee_shm_pool_mgr *dmabuf_mgr;
	void *rc;

	/*
	 * Create the pool for driver private shared memory
	 */
	rc = tee_shm_pool_mgr_alloc_res_mem(priv_info->vaddr, priv_info->paddr,
					    priv_info->size,
					    3 /* 8 byte aligned */);
	if (IS_ERR(rc))
		return rc;
	priv_mgr = rc;

	/*
	 * Create the pool for dma_buf shared memory
	 */
	rc = tee_shm_pool_mgr_alloc_res_mem(dmabuf_info->vaddr,
					    dmabuf_info->paddr,
					    dmabuf_info->size, PAGE_SHIFT);
	if (IS_ERR(rc))
		goto err_free_priv_mgr;
	dmabuf_mgr = rc;

	rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
	if (IS_ERR(rc))
		goto err_free_dmabuf_mgr;

	return rc;

err_free_dmabuf_mgr:
	tee_shm_pool_mgr_destroy(dmabuf_mgr);
err_free_priv_mgr:
	tee_shm_pool_mgr_destroy(priv_mgr);

	return rc;
}
EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);

struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,
							phys_addr_t paddr,
							size_t size,
							int min_alloc_order)
{
	const size_t page_mask = PAGE_SIZE - 1;
	struct tee_shm_pool_mgr *mgr;
	int rc;

	/* Start and end must be page aligned */
	if (vaddr & page_mask || paddr & page_mask || size & page_mask)
		return ERR_PTR(-EINVAL);

	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
	if (!mgr)
		return ERR_PTR(-ENOMEM);

	mgr->private_data = gen_pool_create(min_alloc_order, -1);
	if (!mgr->private_data) {
		rc = -ENOMEM;
		goto err;
	}

	gen_pool_set_algo(mgr->private_data, gen_pool_best_fit, NULL);
	rc = gen_pool_add_virt(mgr->private_data, vaddr, paddr, size, -1);
	if (rc) {
		gen_pool_destroy(mgr->private_data);
		goto err;
	}

	mgr->ops = &pool_ops_generic;

	return mgr;
err:
	kfree(mgr);

	return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(tee_shm_pool_mgr_alloc_res_mem);

static bool check_mgr_ops(struct tee_shm_pool_mgr *mgr)
{
	return mgr && mgr->ops && mgr->ops->alloc && mgr->ops->free &&
		mgr->ops->destroy_poolmgr;
}

struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
					struct tee_shm_pool_mgr *dmabuf_mgr)
{
	struct tee_shm_pool *pool;

	if (!check_mgr_ops(priv_mgr) || !check_mgr_ops(dmabuf_mgr))
		return ERR_PTR(-EINVAL);

	pool = kzalloc(sizeof(*pool), GFP_KERNEL);
	if (!pool)
		return ERR_PTR(-ENOMEM);

	pool->private_mgr = priv_mgr;
	pool->dma_buf_mgr = dmabuf_mgr;

	return pool;
}
EXPORT_SYMBOL_GPL(tee_shm_pool_alloc);

/**
 * tee_shm_pool_free() - Free a shared memory pool
 * @pool:	The shared memory pool to free
 *
 * There must be no remaining shared memory allocated from this pool when
 * this function is called.
 */
void tee_shm_pool_free(struct tee_shm_pool *pool)
{
	if (pool->private_mgr)
		tee_shm_pool_mgr_destroy(pool->private_mgr);
	if (pool->dma_buf_mgr)
		tee_shm_pool_mgr_destroy(pool->dma_buf_mgr);
	kfree(pool);
}
EXPORT_SYMBOL_GPL(tee_shm_pool_free);