mirror of https://gitee.com/openkylin/linux.git
187 lines
4.5 KiB
C
187 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015, Linaro Limited
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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 void pool_op_gen_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
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{
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gen_pool_destroy(poolm->private_data);
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kfree(poolm);
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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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.destroy_poolmgr = pool_op_gen_destroy_poolmgr,
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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_mgr *priv_mgr;
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struct tee_shm_pool_mgr *dmabuf_mgr;
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void *rc;
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/*
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* Create the pool for driver private shared memory
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*/
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rc = tee_shm_pool_mgr_alloc_res_mem(priv_info->vaddr, priv_info->paddr,
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priv_info->size,
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3 /* 8 byte aligned */);
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if (IS_ERR(rc))
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return rc;
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priv_mgr = rc;
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/*
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* Create the pool for dma_buf shared memory
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*/
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rc = tee_shm_pool_mgr_alloc_res_mem(dmabuf_info->vaddr,
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dmabuf_info->paddr,
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dmabuf_info->size, PAGE_SHIFT);
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if (IS_ERR(rc))
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goto err_free_priv_mgr;
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dmabuf_mgr = rc;
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rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
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if (IS_ERR(rc))
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goto err_free_dmabuf_mgr;
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return rc;
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err_free_dmabuf_mgr:
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tee_shm_pool_mgr_destroy(dmabuf_mgr);
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err_free_priv_mgr:
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tee_shm_pool_mgr_destroy(priv_mgr);
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return rc;
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}
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EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
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struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,
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phys_addr_t paddr,
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size_t size,
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int min_alloc_order)
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{
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const size_t page_mask = PAGE_SIZE - 1;
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struct tee_shm_pool_mgr *mgr;
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int rc;
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/* Start and end must be page aligned */
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if (vaddr & page_mask || paddr & page_mask || size & page_mask)
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return ERR_PTR(-EINVAL);
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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->private_data = gen_pool_create(min_alloc_order, -1);
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if (!mgr->private_data) {
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rc = -ENOMEM;
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goto err;
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}
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gen_pool_set_algo(mgr->private_data, gen_pool_best_fit, NULL);
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rc = gen_pool_add_virt(mgr->private_data, vaddr, paddr, size, -1);
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if (rc) {
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gen_pool_destroy(mgr->private_data);
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goto err;
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}
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mgr->ops = &pool_ops_generic;
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return mgr;
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err:
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kfree(mgr);
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return ERR_PTR(rc);
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}
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EXPORT_SYMBOL_GPL(tee_shm_pool_mgr_alloc_res_mem);
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static bool check_mgr_ops(struct tee_shm_pool_mgr *mgr)
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{
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return mgr && mgr->ops && mgr->ops->alloc && mgr->ops->free &&
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mgr->ops->destroy_poolmgr;
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}
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struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
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struct tee_shm_pool_mgr *dmabuf_mgr)
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{
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struct tee_shm_pool *pool;
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if (!check_mgr_ops(priv_mgr) || !check_mgr_ops(dmabuf_mgr))
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return ERR_PTR(-EINVAL);
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pool = kzalloc(sizeof(*pool), GFP_KERNEL);
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if (!pool)
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return ERR_PTR(-ENOMEM);
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pool->private_mgr = priv_mgr;
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pool->dma_buf_mgr = dmabuf_mgr;
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return pool;
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}
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EXPORT_SYMBOL_GPL(tee_shm_pool_alloc);
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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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if (pool->private_mgr)
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tee_shm_pool_mgr_destroy(pool->private_mgr);
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if (pool->dma_buf_mgr)
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tee_shm_pool_mgr_destroy(pool->dma_buf_mgr);
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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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