71cc47d4cc
Adds a new function tee_shm_alloc_user_buf() for user mode allocations, replacing passing the flags TEE_SHM_MAPPED | TEE_SHM_DMA_BUF to tee_shm_alloc(). Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
131 lines
3.1 KiB
C
131 lines
3.1 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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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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