linux-stable/drivers/tee/amdtee/shm_pool.c
Rijo Thomas 757cc3e9ff tee: add AMD-TEE driver
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>
2020-01-04 13:49:51 +08:00

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;
}