1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015, 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
pool_op_gen_alloc(struct tee_shm_pool_mgr * poolm,struct tee_shm * shm,size_t size)12 static int pool_op_gen_alloc(struct tee_shm_pool_mgr *poolm,
13 struct tee_shm *shm, size_t size)
14 {
15 unsigned long va;
16 struct gen_pool *genpool = poolm->private_data;
17 size_t s = roundup(size, 1 << genpool->min_alloc_order);
18
19 va = gen_pool_alloc(genpool, s);
20 if (!va)
21 return -ENOMEM;
22
23 memset((void *)va, 0, s);
24 shm->kaddr = (void *)va;
25 shm->paddr = gen_pool_virt_to_phys(genpool, va);
26 shm->size = s;
27 return 0;
28 }
29
pool_op_gen_free(struct tee_shm_pool_mgr * poolm,struct tee_shm * shm)30 static void pool_op_gen_free(struct tee_shm_pool_mgr *poolm,
31 struct tee_shm *shm)
32 {
33 gen_pool_free(poolm->private_data, (unsigned long)shm->kaddr,
34 shm->size);
35 shm->kaddr = NULL;
36 }
37
pool_op_gen_destroy_poolmgr(struct tee_shm_pool_mgr * poolm)38 static void pool_op_gen_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
39 {
40 gen_pool_destroy(poolm->private_data);
41 kfree(poolm);
42 }
43
44 static const struct tee_shm_pool_mgr_ops pool_ops_generic = {
45 .alloc = pool_op_gen_alloc,
46 .free = pool_op_gen_free,
47 .destroy_poolmgr = pool_op_gen_destroy_poolmgr,
48 };
49
50 /**
51 * tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved
52 * memory range
53 * @priv_info: Information for driver private shared memory pool
54 * @dmabuf_info: Information for dma-buf shared memory pool
55 *
56 * Start and end of pools will must be page aligned.
57 *
58 * Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
59 * in @dmabuf, others will use the range provided by @priv.
60 *
61 * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
62 */
63 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)64 tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info,
65 struct tee_shm_pool_mem_info *dmabuf_info)
66 {
67 struct tee_shm_pool_mgr *priv_mgr;
68 struct tee_shm_pool_mgr *dmabuf_mgr;
69 void *rc;
70
71 /*
72 * Create the pool for driver private shared memory
73 */
74 rc = tee_shm_pool_mgr_alloc_res_mem(priv_info->vaddr, priv_info->paddr,
75 priv_info->size,
76 3 /* 8 byte aligned */);
77 if (IS_ERR(rc))
78 return rc;
79 priv_mgr = rc;
80
81 /*
82 * Create the pool for dma_buf shared memory
83 */
84 rc = tee_shm_pool_mgr_alloc_res_mem(dmabuf_info->vaddr,
85 dmabuf_info->paddr,
86 dmabuf_info->size, PAGE_SHIFT);
87 if (IS_ERR(rc))
88 goto err_free_priv_mgr;
89 dmabuf_mgr = rc;
90
91 rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
92 if (IS_ERR(rc))
93 goto err_free_dmabuf_mgr;
94
95 return rc;
96
97 err_free_dmabuf_mgr:
98 tee_shm_pool_mgr_destroy(dmabuf_mgr);
99 err_free_priv_mgr:
100 tee_shm_pool_mgr_destroy(priv_mgr);
101
102 return rc;
103 }
104 EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
105
tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,phys_addr_t paddr,size_t size,int min_alloc_order)106 struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,
107 phys_addr_t paddr,
108 size_t size,
109 int min_alloc_order)
110 {
111 const size_t page_mask = PAGE_SIZE - 1;
112 struct tee_shm_pool_mgr *mgr;
113 int rc;
114
115 /* Start and end must be page aligned */
116 if (vaddr & page_mask || paddr & page_mask || size & page_mask)
117 return ERR_PTR(-EINVAL);
118
119 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
120 if (!mgr)
121 return ERR_PTR(-ENOMEM);
122
123 mgr->private_data = gen_pool_create(min_alloc_order, -1);
124 if (!mgr->private_data) {
125 rc = -ENOMEM;
126 goto err;
127 }
128
129 gen_pool_set_algo(mgr->private_data, gen_pool_best_fit, NULL);
130 rc = gen_pool_add_virt(mgr->private_data, vaddr, paddr, size, -1);
131 if (rc) {
132 gen_pool_destroy(mgr->private_data);
133 goto err;
134 }
135
136 mgr->ops = &pool_ops_generic;
137
138 return mgr;
139 err:
140 kfree(mgr);
141
142 return ERR_PTR(rc);
143 }
144 EXPORT_SYMBOL_GPL(tee_shm_pool_mgr_alloc_res_mem);
145
check_mgr_ops(struct tee_shm_pool_mgr * mgr)146 static bool check_mgr_ops(struct tee_shm_pool_mgr *mgr)
147 {
148 return mgr && mgr->ops && mgr->ops->alloc && mgr->ops->free &&
149 mgr->ops->destroy_poolmgr;
150 }
151
tee_shm_pool_alloc(struct tee_shm_pool_mgr * priv_mgr,struct tee_shm_pool_mgr * dmabuf_mgr)152 struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
153 struct tee_shm_pool_mgr *dmabuf_mgr)
154 {
155 struct tee_shm_pool *pool;
156
157 if (!check_mgr_ops(priv_mgr) || !check_mgr_ops(dmabuf_mgr))
158 return ERR_PTR(-EINVAL);
159
160 pool = kzalloc(sizeof(*pool), GFP_KERNEL);
161 if (!pool)
162 return ERR_PTR(-ENOMEM);
163
164 pool->private_mgr = priv_mgr;
165 pool->dma_buf_mgr = dmabuf_mgr;
166
167 return pool;
168 }
169 EXPORT_SYMBOL_GPL(tee_shm_pool_alloc);
170
171 /**
172 * tee_shm_pool_free() - Free a shared memory pool
173 * @pool: The shared memory pool to free
174 *
175 * There must be no remaining shared memory allocated from this pool when
176 * this function is called.
177 */
tee_shm_pool_free(struct tee_shm_pool * pool)178 void tee_shm_pool_free(struct tee_shm_pool *pool)
179 {
180 if (pool->private_mgr)
181 tee_shm_pool_mgr_destroy(pool->private_mgr);
182 if (pool->dma_buf_mgr)
183 tee_shm_pool_mgr_destroy(pool->dma_buf_mgr);
184 kfree(pool);
185 }
186 EXPORT_SYMBOL_GPL(tee_shm_pool_free);
187
