Add support in the OP-TEE backend driver for dynamic protected memory allocation using the SMC ABI.
Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/optee/smc_abi.c | 78 +++++++++++++++++++++++++++++++++++-- 1 file changed, 75 insertions(+), 3 deletions(-)
diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c index cf106d15e64e..fd1d873de941 100644 --- a/drivers/tee/optee/smc_abi.c +++ b/drivers/tee/optee/smc_abi.c @@ -965,6 +965,70 @@ static int optee_smc_do_call_with_arg(struct tee_context *ctx, return rc; }
+static int optee_smc_lend_protmem(struct optee *optee, struct tee_shm *protmem, + u16 *end_points, unsigned int ep_count, + u32 use_case) +{ + struct optee_shm_arg_entry *entry; + struct optee_msg_arg *msg_arg; + struct tee_shm *shm; + u_int offs; + int rc; + + msg_arg = optee_get_msg_arg(optee->ctx, 2, &entry, &shm, &offs); + if (IS_ERR(msg_arg)) + return PTR_ERR(msg_arg); + + msg_arg->cmd = OPTEE_MSG_CMD_LEND_PROTMEM; + msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT; + msg_arg->params[0].u.value.a = use_case; + msg_arg->params[1].attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT; + msg_arg->params[1].u.tmem.buf_ptr = protmem->paddr; + msg_arg->params[1].u.tmem.size = protmem->size; + msg_arg->params[1].u.tmem.shm_ref = (u_long)protmem; + + rc = optee->ops->do_call_with_arg(optee->ctx, shm, offs, false); + if (rc) + goto out; + if (msg_arg->ret != TEEC_SUCCESS) { + rc = -EINVAL; + goto out; + } + protmem->sec_world_id = (u_long)protmem; + +out: + optee_free_msg_arg(optee->ctx, entry, offs); + return rc; +} + +static int optee_smc_reclaim_protmem(struct optee *optee, + struct tee_shm *protmem) +{ + struct optee_shm_arg_entry *entry; + struct optee_msg_arg *msg_arg; + struct tee_shm *shm; + u_int offs; + int rc; + + msg_arg = optee_get_msg_arg(optee->ctx, 1, &entry, &shm, &offs); + if (IS_ERR(msg_arg)) + return PTR_ERR(msg_arg); + + msg_arg->cmd = OPTEE_MSG_CMD_RECLAIM_PROTMEM; + msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT; + msg_arg->params[0].u.rmem.shm_ref = (u_long)protmem; + + rc = optee->ops->do_call_with_arg(optee->ctx, shm, offs, false); + if (rc) + goto out; + if (msg_arg->ret != TEEC_SUCCESS) + rc = -EINVAL; + +out: + optee_free_msg_arg(optee->ctx, entry, offs); + return rc; +} + /* * 5. Asynchronous notification */ @@ -1216,6 +1280,8 @@ static const struct optee_ops optee_ops = { .do_call_with_arg = optee_smc_do_call_with_arg, .to_msg_param = optee_to_msg_param, .from_msg_param = optee_from_msg_param, + .lend_protmem = optee_smc_lend_protmem, + .reclaim_protmem = optee_smc_reclaim_protmem, };
static int enable_async_notif(optee_invoke_fn *invoke_fn) @@ -1628,14 +1694,20 @@ static struct tee_protmem_pool *static_protmem_pool_init(struct optee *optee)
static int optee_protmem_pool_init(struct optee *optee) { + bool protm = optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_PROTMEM; + bool dyn_protm = optee->smc.sec_caps & + OPTEE_SMC_SEC_CAP_DYNAMIC_PROTMEM; enum tee_dma_heap_id heap_id = TEE_DMA_HEAP_SECURE_VIDEO_PLAY; struct tee_protmem_pool *pool = ERR_PTR(-EINVAL); - int rc; + int rc = -EINVAL;
- if (!(optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_PROTMEM)) + if (!protm && !dyn_protm) return 0;
- pool = static_protmem_pool_init(optee); + if (protm) + pool = static_protmem_pool_init(optee); + if (dyn_protm && IS_ERR(pool)) + pool = optee_protmem_alloc_dyn_pool(optee, heap_id); if (IS_ERR(pool)) return PTR_ERR(pool);