forked from mirrors/linux
abd135ba21
This is simple pool that uses kernel page allocator. This pool can be used in case OP-TEE supports dynamic shared memory. Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
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* Copyright (c) 2015, Linaro Limited
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* Copyright (c) 2017, EPAM Systems
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/device.h>
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#include <linux/dma-buf.h>
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#include <linux/genalloc.h>
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#include <linux/slab.h>
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#include <linux/tee_drv.h>
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#include "optee_private.h"
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#include "optee_smc.h"
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#include "shm_pool.h"
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static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
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struct tee_shm *shm, size_t size)
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{
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unsigned int order = get_order(size);
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struct page *page;
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page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
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if (!page)
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return -ENOMEM;
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shm->kaddr = page_address(page);
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shm->paddr = page_to_phys(page);
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shm->size = PAGE_SIZE << order;
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return 0;
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}
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static void pool_op_free(struct tee_shm_pool_mgr *poolm,
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struct tee_shm *shm)
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{
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free_pages((unsigned long)shm->kaddr, get_order(shm->size));
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shm->kaddr = NULL;
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}
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static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
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{
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kfree(poolm);
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}
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static const struct tee_shm_pool_mgr_ops pool_ops = {
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.alloc = pool_op_alloc,
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.free = pool_op_free,
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.destroy_poolmgr = pool_op_destroy_poolmgr,
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};
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/**
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* optee_shm_pool_alloc_pages() - create page-based allocator pool
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*
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* This pool is used when OP-TEE supports dymanic SHM. In this case
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* command buffers and such are allocated from kernel's own memory.
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*/
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struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)
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{
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struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
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if (!mgr)
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return ERR_PTR(-ENOMEM);
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mgr->ops = &pool_ops;
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return mgr;
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}
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