Commit abd135ba authored by Volodymyr Babchuk's avatar Volodymyr Babchuk Committed by Jens Wiklander
Browse files

tee: optee: add optee-specific shared pool implementation 



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: default avatarVolodymyr Babchuk <vlad.babchuk@gmail.com>
Signed-off-by: default avatarJens Wiklander <jens.wiklander@linaro.org>
parent d885cc5e

drivers/tee/optee/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,3 +4,4 @@ optee-objs += core.o 
optee-objs += call.o

optee-objs += rpc.o

optee-objs += supp.o

optee-objs += shm_pool.o

drivers/tee/optee/shm_pool.c

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/*

 * Copyright (c) 2015, Linaro Limited

 * Copyright (c) 2017, EPAM Systems

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */

#include <linux/device.h>

#include <linux/dma-buf.h>

#include <linux/genalloc.h>

#include <linux/slab.h>

#include <linux/tee_drv.h>

#include "optee_private.h"

#include "optee_smc.h"

#include "shm_pool.h"



static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,

			 struct tee_shm *shm, size_t size)

{

	unsigned int order = get_order(size);

	struct page *page;



	page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);

	if (!page)

		return -ENOMEM;



	shm->kaddr = page_address(page);

	shm->paddr = page_to_phys(page);

	shm->size = PAGE_SIZE << order;



	return 0;

}



static void pool_op_free(struct tee_shm_pool_mgr *poolm,

			 struct tee_shm *shm)

{

	free_pages((unsigned long)shm->kaddr, get_order(shm->size));

	shm->kaddr = NULL;

}



static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)

{

	kfree(poolm);

}



static const struct tee_shm_pool_mgr_ops pool_ops = {

	.alloc = pool_op_alloc,

	.free = pool_op_free,

	.destroy_poolmgr = pool_op_destroy_poolmgr,

};



/**

 * optee_shm_pool_alloc_pages() - create page-based allocator pool

 *

 * This pool is used when OP-TEE supports dymanic SHM. In this case

 * command buffers and such are allocated from kernel's own memory.

 */

struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)

{

	struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);



	if (!mgr)

		return ERR_PTR(-ENOMEM);



	mgr->ops = &pool_ops;



	return mgr;

}

drivers/tee/optee/shm_pool.h

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/*

 * Copyright (c) 2015, Linaro Limited

 * Copyright (c) 2016, EPAM Systems

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#ifndef SHM_POOL_H

#define SHM_POOL_H



#include <linux/tee_drv.h>



struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void);



#endif