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967c9cca JW |
1 | /* |
2 | * Copyright (c) 2015, Linaro Limited | |
3 | * | |
4 | * This software is licensed under the terms of the GNU General Public | |
5 | * License version 2, as published by the Free Software Foundation, and | |
6 | * may be copied, distributed, and modified under those terms. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | */ | |
14 | #include <linux/device.h> | |
15 | #include <linux/dma-buf.h> | |
16 | #include <linux/genalloc.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/tee_drv.h> | |
19 | #include "tee_private.h" | |
20 | ||
21 | static int pool_op_gen_alloc(struct tee_shm_pool_mgr *poolm, | |
22 | struct tee_shm *shm, size_t size) | |
23 | { | |
24 | unsigned long va; | |
25 | struct gen_pool *genpool = poolm->private_data; | |
26 | size_t s = roundup(size, 1 << genpool->min_alloc_order); | |
27 | ||
28 | va = gen_pool_alloc(genpool, s); | |
29 | if (!va) | |
30 | return -ENOMEM; | |
31 | ||
32 | memset((void *)va, 0, s); | |
33 | shm->kaddr = (void *)va; | |
34 | shm->paddr = gen_pool_virt_to_phys(genpool, va); | |
35 | shm->size = s; | |
36 | return 0; | |
37 | } | |
38 | ||
39 | static void pool_op_gen_free(struct tee_shm_pool_mgr *poolm, | |
40 | struct tee_shm *shm) | |
41 | { | |
42 | gen_pool_free(poolm->private_data, (unsigned long)shm->kaddr, | |
43 | shm->size); | |
44 | shm->kaddr = NULL; | |
45 | } | |
46 | ||
47 | static const struct tee_shm_pool_mgr_ops pool_ops_generic = { | |
48 | .alloc = pool_op_gen_alloc, | |
49 | .free = pool_op_gen_free, | |
50 | }; | |
51 | ||
52 | static void pool_res_mem_destroy(struct tee_shm_pool *pool) | |
53 | { | |
54 | gen_pool_destroy(pool->private_mgr.private_data); | |
55 | gen_pool_destroy(pool->dma_buf_mgr.private_data); | |
56 | } | |
57 | ||
58 | static int pool_res_mem_mgr_init(struct tee_shm_pool_mgr *mgr, | |
59 | struct tee_shm_pool_mem_info *info, | |
60 | int min_alloc_order) | |
61 | { | |
62 | size_t page_mask = PAGE_SIZE - 1; | |
63 | struct gen_pool *genpool = NULL; | |
64 | int rc; | |
65 | ||
66 | /* | |
67 | * Start and end must be page aligned | |
68 | */ | |
69 | if ((info->vaddr & page_mask) || (info->paddr & page_mask) || | |
70 | (info->size & page_mask)) | |
71 | return -EINVAL; | |
72 | ||
73 | genpool = gen_pool_create(min_alloc_order, -1); | |
74 | if (!genpool) | |
75 | return -ENOMEM; | |
76 | ||
77 | gen_pool_set_algo(genpool, gen_pool_best_fit, NULL); | |
78 | rc = gen_pool_add_virt(genpool, info->vaddr, info->paddr, info->size, | |
79 | -1); | |
80 | if (rc) { | |
81 | gen_pool_destroy(genpool); | |
82 | return rc; | |
83 | } | |
84 | ||
85 | mgr->private_data = genpool; | |
86 | mgr->ops = &pool_ops_generic; | |
87 | return 0; | |
88 | } | |
89 | ||
90 | /** | |
91 | * tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved | |
92 | * memory range | |
93 | * @priv_info: Information for driver private shared memory pool | |
94 | * @dmabuf_info: Information for dma-buf shared memory pool | |
95 | * | |
96 | * Start and end of pools will must be page aligned. | |
97 | * | |
98 | * Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied | |
99 | * in @dmabuf, others will use the range provided by @priv. | |
100 | * | |
101 | * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure. | |
102 | */ | |
103 | struct tee_shm_pool * | |
104 | tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info, | |
105 | struct tee_shm_pool_mem_info *dmabuf_info) | |
106 | { | |
107 | struct tee_shm_pool *pool = NULL; | |
108 | int ret; | |
109 | ||
110 | pool = kzalloc(sizeof(*pool), GFP_KERNEL); | |
111 | if (!pool) { | |
112 | ret = -ENOMEM; | |
113 | goto err; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Create the pool for driver private shared memory | |
118 | */ | |
119 | ret = pool_res_mem_mgr_init(&pool->private_mgr, priv_info, | |
120 | 3 /* 8 byte aligned */); | |
121 | if (ret) | |
122 | goto err; | |
123 | ||
124 | /* | |
125 | * Create the pool for dma_buf shared memory | |
126 | */ | |
127 | ret = pool_res_mem_mgr_init(&pool->dma_buf_mgr, dmabuf_info, | |
128 | PAGE_SHIFT); | |
129 | if (ret) | |
130 | goto err; | |
131 | ||
132 | pool->destroy = pool_res_mem_destroy; | |
133 | return pool; | |
134 | err: | |
135 | if (ret == -ENOMEM) | |
136 | pr_err("%s: can't allocate memory for res_mem shared memory pool\n", __func__); | |
137 | if (pool && pool->private_mgr.private_data) | |
138 | gen_pool_destroy(pool->private_mgr.private_data); | |
139 | kfree(pool); | |
140 | return ERR_PTR(ret); | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem); | |
143 | ||
144 | /** | |
145 | * tee_shm_pool_free() - Free a shared memory pool | |
146 | * @pool: The shared memory pool to free | |
147 | * | |
148 | * There must be no remaining shared memory allocated from this pool when | |
149 | * this function is called. | |
150 | */ | |
151 | void tee_shm_pool_free(struct tee_shm_pool *pool) | |
152 | { | |
153 | pool->destroy(pool); | |
154 | kfree(pool); | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(tee_shm_pool_free); |