71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright 2019 Advanced Micro Devices, Inc.
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*/
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#include <linux/slab.h>
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#include <linux/tee_drv.h>
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#include <linux/psp.h>
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#include "amdtee_private.h"
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static int pool_op_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 int order = get_order(size);
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unsigned long va;
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int rc;
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/*
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* Ignore alignment since this is already going to be page aligned
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* and there's no need for any larger alignment.
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*/
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va = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
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if (!va)
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return -ENOMEM;
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shm->kaddr = (void *)va;
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shm->paddr = __psp_pa((void *)va);
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shm->size = PAGE_SIZE << order;
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/* Map the allocated memory in to TEE */
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rc = amdtee_map_shmem(shm);
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if (rc) {
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free_pages(va, order);
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shm->kaddr = NULL;
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return rc;
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}
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return 0;
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}
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static void pool_op_free(struct tee_shm_pool *pool, struct tee_shm *shm)
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{
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/* Unmap the shared memory from TEE */
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amdtee_unmap_shmem(shm);
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free_pages((unsigned long)shm->kaddr, get_order(shm->size));
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shm->kaddr = NULL;
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}
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static void pool_op_destroy_pool(struct tee_shm_pool *pool)
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{
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kfree(pool);
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}
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static const struct tee_shm_pool_ops pool_ops = {
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.alloc = pool_op_alloc,
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.free = pool_op_free,
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.destroy_pool = pool_op_destroy_pool,
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};
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struct tee_shm_pool *amdtee_config_shm(void)
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{
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struct tee_shm_pool *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->ops = &pool_ops;
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return pool;
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}
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