mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
757cc3e9ff
Adds AMD-TEE driver. * targets AMD APUs which has AMD Secure Processor with software-based Trusted Execution Environment (TEE) support * registers with TEE subsystem * defines tee_driver_ops function callbacks * kernel allocated memory is used as shared memory between normal world and secure world. * acts as REE (Rich Execution Environment) communication agent, which uses the services of AMD Secure Processor driver to submit commands for processing in TEE environment Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Tom Lendacky <thomas.lendacky@amd.com> Acked-by: Jens Wiklander <jens.wiklander@linaro.org> Co-developed-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com> Signed-off-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com> Signed-off-by: Rijo Thomas <Rijo-john.Thomas@amd.com> Reviewed-by: Gary R Hook <gary.hook@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
93 lines
1.8 KiB
C
93 lines
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;
|
|
}
|