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tee: optee: sync cache on pre-reloc OP-TEE invocation

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This change ensures both U-Boot and OP-TEE see the same content
from shared memory when OP-TEE is invoked prior U-Boot relocation.

This change is required since U-Boot may execute with data cache off
while OP-TEE always enables cache on memory shared with U-Boot.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Etienne Carriere 2021-05-19 16:27:41 +02:00 committed by Tom Rini
parent 674afa6b35
commit 9e6da34c72
3 changed files with 44 additions and 2 deletions
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21
drivers/tee/optee/core.c
View file

@ -1,9 +1,10 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018 Linaro Limited
* Copyright (c) 2018-2020 Linaro Limited
*/
#include <common.h>
#include <cpu_func.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <log.h>
@ -295,6 +296,16 @@ static u32 call_err_to_res(u32 call_err)
}
}
static void flush_shm_dcache(struct udevice *dev, struct optee_msg_arg *arg)
{
size_t sz = OPTEE_MSG_GET_ARG_SIZE(arg->num_params);
flush_dcache_range(rounddown((ulong)arg, CONFIG_SYS_CACHELINE_SIZE),
roundup((ulong)arg + sz, CONFIG_SYS_CACHELINE_SIZE));
tee_flush_all_shm_dcache(dev);
}
static u32 do_call_with_arg(struct udevice *dev, struct optee_msg_arg *arg)
{
struct optee_pdata *pdata = dev_get_plat(dev);
@ -305,9 +316,17 @@ static u32 do_call_with_arg(struct udevice *dev, struct optee_msg_arg *arg)
while (true) {
struct arm_smccc_res res;
/* If cache are off from U-Boot, sync the cache shared with OP-TEE */
if (!dcache_status())
flush_shm_dcache(dev, arg);
pdata->invoke_fn(param.a0, param.a1, param.a2, param.a3,
param.a4, param.a5, param.a6, param.a7, &res);
/* If cache are off from U-Boot, sync the cache shared with OP-TEE */
if (!dcache_status())
flush_shm_dcache(dev, arg);
free(page_list);
page_list = NULL;

19
drivers/tee/tee-uclass.c
View file

@ -1,15 +1,17 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018 Linaro Limited
* Copyright (c) 2018-2020 Linaro Limited
*/
#define LOG_CATEGORY UCLASS_TEE
#include <common.h>
#include <cpu_func.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <tee.h>
#include <asm/cache.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
@ -235,3 +237,18 @@ void tee_optee_ta_uuid_to_octets(u8 d[TEE_UUID_LEN],
d[7] = s->time_hi_and_version;
memcpy(d + 8, s->clock_seq_and_node, sizeof(s->clock_seq_and_node));
}
void tee_flush_all_shm_dcache(struct udevice *dev)
{
struct tee_uclass_priv *priv = dev_get_uclass_priv(dev);
struct tee_shm *s;
list_for_each_entry(s, &priv->list_shm, link) {
ulong start = rounddown((ulong)s->addr,
CONFIG_SYS_CACHELINE_SIZE);
ulong end = roundup((ulong)s->addr + s->size,
CONFIG_SYS_CACHELINE_SIZE);
flush_dcache_range(start, end);
}
}

6
include/tee.h
View file

@ -377,4 +377,10 @@ void tee_optee_ta_uuid_from_octets(struct tee_optee_ta_uuid *d,
void tee_optee_ta_uuid_to_octets(u8 d[TEE_UUID_LEN],
const struct tee_optee_ta_uuid *s);
/**
* tee_flush_all_shm_dcache() - Flush data cache for all shared memories
* @dev: The TEE device
*/
void tee_flush_all_shm_dcache(struct udevice *dev);
#endif /* __TEE_H */