1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015, Linaro Limited
4 * Copyright (c) 2017, EPAM Systems
6 #include <linux/device.h>
7 #include <linux/dma-buf.h>
8 #include <linux/genalloc.h>
9 #include <linux/slab.h>
10 #include <linux/tee_drv.h>
11 #include "optee_private.h"
12 #include "optee_smc.h"
15 static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
16 struct tee_shm *shm, size_t size)
18 unsigned int order = get_order(size);
22 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
26 shm->kaddr = page_address(page);
27 shm->paddr = page_to_phys(page);
28 shm->size = PAGE_SIZE << order;
31 * Shared memory private to the OP-TEE driver doesn't need
32 * to be registered with OP-TEE.
34 if (!(shm->flags & TEE_SHM_PRIV)) {
35 unsigned int nr_pages = 1 << order, i;
38 pages = kcalloc(nr_pages, sizeof(pages), GFP_KERNEL);
44 for (i = 0; i < nr_pages; i++) {
49 shm->flags |= TEE_SHM_REGISTER;
50 rc = optee_shm_register(shm->ctx, shm, pages, nr_pages,
51 (unsigned long)shm->kaddr);
60 __free_pages(page, order);
64 static void pool_op_free(struct tee_shm_pool_mgr *poolm,
67 if (!(shm->flags & TEE_SHM_PRIV))
68 optee_shm_unregister(shm->ctx, shm);
70 free_pages((unsigned long)shm->kaddr, get_order(shm->size));
74 static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
79 static const struct tee_shm_pool_mgr_ops pool_ops = {
80 .alloc = pool_op_alloc,
82 .destroy_poolmgr = pool_op_destroy_poolmgr,
86 * optee_shm_pool_alloc_pages() - create page-based allocator pool
88 * This pool is used when OP-TEE supports dymanic SHM. In this case
89 * command buffers and such are allocated from kernel's own memory.
91 struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)
93 struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
96 return ERR_PTR(-ENOMEM);