lkml.org 
[lkml]   [2017]   [Sep]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v1 11/14] tee: optee: add optee-specific shared pool implementation
    Date
    From: Volodymyr Babchuk <vlad.babchuk@gmail.com>

    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>
    ---
    drivers/tee/optee/Makefile | 1 +
    drivers/tee/optee/shm_pool.c | 75 ++++++++++++++++++++++++++++++++++++++++++++
    drivers/tee/optee/shm_pool.h | 23 ++++++++++++++
    3 files changed, 99 insertions(+)
    create mode 100644 drivers/tee/optee/shm_pool.c
    create mode 100644 drivers/tee/optee/shm_pool.h

    diff --git a/drivers/tee/optee/Makefile b/drivers/tee/optee/Makefile
    index 92fe578..220cf42 100644
    --- a/drivers/tee/optee/Makefile
    +++ b/drivers/tee/optee/Makefile
    @@ -3,3 +3,4 @@ optee-objs += core.o
    optee-objs += call.o
    optee-objs += rpc.o
    optee-objs += supp.o
    +optee-objs += shm_pool.o
    diff --git a/drivers/tee/optee/shm_pool.c b/drivers/tee/optee/shm_pool.c
    new file mode 100644
    index 0000000..4939781
    --- /dev/null
    +++ b/drivers/tee/optee/shm_pool.c
    @@ -0,0 +1,75 @@
    +/*
    + * 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;
    +}
    diff --git a/drivers/tee/optee/shm_pool.h b/drivers/tee/optee/shm_pool.h
    new file mode 100644
    index 0000000..4e753c3
    --- /dev/null
    +++ b/drivers/tee/optee/shm_pool.h
    @@ -0,0 +1,23 @@
    +/*
    + * 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
    --
    2.7.4
    \
     
     \ /
      Last update: 2017-09-28 20:08    [W:8.163 / U:0.020 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site