94 строки
1.8 KiB
C
94 строки
1.8 KiB
C
// SPDX-License-Identifier: MIT
|
|
/*
|
|
* Copyright 2019 Advanced Micro Devices, Inc.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/tee_drv.h>
|
|
#include <linux/psp-sev.h>
|
|
#include "amdtee_private.h"
|
|
|
|
static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm,
|
|
size_t size)
|
|
{
|
|
unsigned int order = get_order(size);
|
|
unsigned long va;
|
|
int rc;
|
|
|
|
va = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
|
|
if (!va)
|
|
return -ENOMEM;
|
|
|
|
shm->kaddr = (void *)va;
|
|
shm->paddr = __psp_pa((void *)va);
|
|
shm->size = PAGE_SIZE << order;
|
|
|
|
/* Map the allocated memory in to TEE */
|
|
rc = amdtee_map_shmem(shm);
|
|
if (rc) {
|
|
free_pages(va, order);
|
|
shm->kaddr = NULL;
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pool_op_free(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm)
|
|
{
|
|
/* Unmap the shared memory from TEE */
|
|
amdtee_unmap_shmem(shm);
|
|
free_pages((unsigned long)shm->kaddr, get_order(shm->size));
|
|
shm->kaddr = NULL;
|
|
}
|
|
|
|
static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
|
|
{
|
|
kfree(poolm);
|
|
}
|
|
|
|
static const struct tee_shm_pool_mgr_ops pool_ops = {
|
|
.alloc = pool_op_alloc,
|
|
.free = pool_op_free,
|
|
.destroy_poolmgr = pool_op_destroy_poolmgr,
|
|
};
|
|
|
|
static struct tee_shm_pool_mgr *pool_mem_mgr_alloc(void)
|
|
{
|
|
struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
|
|
|
|
if (!mgr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mgr->ops = &pool_ops;
|
|
|
|
return mgr;
|
|
}
|
|
|
|
struct tee_shm_pool *amdtee_config_shm(void)
|
|
{
|
|
struct tee_shm_pool_mgr *priv_mgr;
|
|
struct tee_shm_pool_mgr *dmabuf_mgr;
|
|
void *rc;
|
|
|
|
rc = pool_mem_mgr_alloc();
|
|
if (IS_ERR(rc))
|
|
return rc;
|
|
priv_mgr = rc;
|
|
|
|
rc = pool_mem_mgr_alloc();
|
|
if (IS_ERR(rc)) {
|
|
tee_shm_pool_mgr_destroy(priv_mgr);
|
|
return rc;
|
|
}
|
|
dmabuf_mgr = rc;
|
|
|
|
rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
|
|
if (IS_ERR(rc)) {
|
|
tee_shm_pool_mgr_destroy(priv_mgr);
|
|
tee_shm_pool_mgr_destroy(dmabuf_mgr);
|
|
}
|
|
|
|
return rc;
|
|
}
|