157 lines
4.0 KiB
C
157 lines
4.0 KiB
C
/*
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* Copyright (c) 2015, Linaro Limited
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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 "tee_private.h"
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static int pool_op_gen_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 long va;
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struct gen_pool *genpool = poolm->private_data;
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size_t s = roundup(size, 1 << genpool->min_alloc_order);
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va = gen_pool_alloc(genpool, s);
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if (!va)
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return -ENOMEM;
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memset((void *)va, 0, s);
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shm->kaddr = (void *)va;
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shm->paddr = gen_pool_virt_to_phys(genpool, va);
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shm->size = s;
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return 0;
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}
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static void pool_op_gen_free(struct tee_shm_pool_mgr *poolm,
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struct tee_shm *shm)
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{
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gen_pool_free(poolm->private_data, (unsigned long)shm->kaddr,
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shm->size);
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shm->kaddr = NULL;
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}
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static const struct tee_shm_pool_mgr_ops pool_ops_generic = {
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.alloc = pool_op_gen_alloc,
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.free = pool_op_gen_free,
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};
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static void pool_res_mem_destroy(struct tee_shm_pool *pool)
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{
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gen_pool_destroy(pool->private_mgr.private_data);
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gen_pool_destroy(pool->dma_buf_mgr.private_data);
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}
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static int pool_res_mem_mgr_init(struct tee_shm_pool_mgr *mgr,
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struct tee_shm_pool_mem_info *info,
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int min_alloc_order)
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{
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size_t page_mask = PAGE_SIZE - 1;
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struct gen_pool *genpool = NULL;
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int rc;
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/*
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* Start and end must be page aligned
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*/
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if ((info->vaddr & page_mask) || (info->paddr & page_mask) ||
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(info->size & page_mask))
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return -EINVAL;
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genpool = gen_pool_create(min_alloc_order, -1);
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if (!genpool)
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return -ENOMEM;
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gen_pool_set_algo(genpool, gen_pool_best_fit, NULL);
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rc = gen_pool_add_virt(genpool, info->vaddr, info->paddr, info->size,
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-1);
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if (rc) {
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gen_pool_destroy(genpool);
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return rc;
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}
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mgr->private_data = genpool;
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mgr->ops = &pool_ops_generic;
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return 0;
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}
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/**
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* tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved
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* memory range
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* @priv_info: Information for driver private shared memory pool
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* @dmabuf_info: Information for dma-buf shared memory pool
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*
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* Start and end of pools will must be page aligned.
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*
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* Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
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* in @dmabuf, others will use the range provided by @priv.
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*
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* @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
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*/
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struct tee_shm_pool *
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tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info,
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struct tee_shm_pool_mem_info *dmabuf_info)
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{
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struct tee_shm_pool *pool = NULL;
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int ret;
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pool = kzalloc(sizeof(*pool), GFP_KERNEL);
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if (!pool) {
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ret = -ENOMEM;
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goto err;
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}
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/*
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* Create the pool for driver private shared memory
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*/
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ret = pool_res_mem_mgr_init(&pool->private_mgr, priv_info,
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3 /* 8 byte aligned */);
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if (ret)
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goto err;
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/*
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* Create the pool for dma_buf shared memory
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*/
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ret = pool_res_mem_mgr_init(&pool->dma_buf_mgr, dmabuf_info,
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PAGE_SHIFT);
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if (ret)
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goto err;
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pool->destroy = pool_res_mem_destroy;
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return pool;
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err:
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if (ret == -ENOMEM)
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pr_err("%s: can't allocate memory for res_mem shared memory pool\n", __func__);
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if (pool && pool->private_mgr.private_data)
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gen_pool_destroy(pool->private_mgr.private_data);
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kfree(pool);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
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/**
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* tee_shm_pool_free() - Free a shared memory pool
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* @pool: The shared memory pool to free
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*
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* There must be no remaining shared memory allocated from this pool when
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* this function is called.
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*/
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void tee_shm_pool_free(struct tee_shm_pool *pool)
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{
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pool->destroy(pool);
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kfree(pool);
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}
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EXPORT_SYMBOL_GPL(tee_shm_pool_free);
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