93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015, 2017, 2022 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 *pool, struct tee_shm *shm,
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size_t size, size_t align)
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{
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unsigned long va;
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struct gen_pool *genpool = pool->private_data;
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size_t a = max_t(size_t, align, BIT(genpool->min_alloc_order));
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struct genpool_data_align data = { .align = a };
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size_t s = roundup(size, a);
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va = gen_pool_alloc_algo(genpool, s, gen_pool_first_fit_align, &data);
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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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/*
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* This is from a static shared memory pool so no need to register
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* each chunk, and no need to unregister later either.
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*/
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shm->flags &= ~TEE_SHM_DYNAMIC;
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return 0;
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}
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static void pool_op_gen_free(struct tee_shm_pool *pool, struct tee_shm *shm)
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{
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gen_pool_free(pool->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_pool(struct tee_shm_pool *pool)
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{
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gen_pool_destroy(pool->private_data);
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kfree(pool);
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}
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static const struct tee_shm_pool_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_pool = pool_op_gen_destroy_pool,
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};
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struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr,
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phys_addr_t paddr, 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 *pool;
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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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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_data = gen_pool_create(min_alloc_order, -1);
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if (!pool->private_data) {
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rc = -ENOMEM;
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goto err;
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}
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rc = gen_pool_add_virt(pool->private_data, vaddr, paddr, size, -1);
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if (rc) {
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gen_pool_destroy(pool->private_data);
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goto err;
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}
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pool->ops = &pool_ops_generic;
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return pool;
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err:
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kfree(pool);
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return ERR_PTR(rc);
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}
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EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
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