Add support in the OP-TEE backend driver for dynamic restricted memory allocation using the SMC ABI.
Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/optee/smc_abi.c | 76 +++++++++++++++++++++++++++++++++++-- 1 file changed, 73 insertions(+), 3 deletions(-)
diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c index 11589e5120c9..ca0cb5045f5b 100644 --- a/drivers/tee/optee/smc_abi.c +++ b/drivers/tee/optee/smc_abi.c @@ -1001,6 +1001,67 @@ static int optee_smc_do_call_with_arg(struct tee_context *ctx, return rc; }
+static int optee_smc_lend_rstmem(struct optee *optee, struct tee_shm *rstmem, + u16 *end_points, unsigned int ep_count) +{ + 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_RSTMEM; + msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT; + msg_arg->params[0].u.value.a = OPTEE_MSG_RSTMEM_SECURE_VIDEO_PLAY; + msg_arg->params[1].attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT; + msg_arg->params[1].u.tmem.buf_ptr = rstmem->paddr; + msg_arg->params[1].u.tmem.size = rstmem->size; + msg_arg->params[1].u.tmem.shm_ref = (u_long)rstmem; + + 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; + } + +out: + optee_free_msg_arg(optee->ctx, entry, offs); + return rc; +} + +static int optee_smc_reclaim_rstmem(struct optee *optee, struct tee_shm *rstmem) +{ + 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_RSTMEM; + msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT; + msg_arg->params[0].u.rmem.shm_ref = (u_long)rstmem; + + 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 */ @@ -1258,6 +1319,8 @@ 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_rstmem = optee_smc_lend_rstmem, + .reclaim_rstmem = optee_smc_reclaim_rstmem, };
static int enable_async_notif(optee_invoke_fn *invoke_fn) @@ -1628,6 +1691,9 @@ static inline int optee_load_fw(struct platform_device *pdev,
static int optee_sdp_pool_init(struct optee *optee) { + bool dyn_sdp = (optee->smc.sec_caps & + OPTEE_SMC_SEC_CAP_DYNAMIC_RSTMEM) && + IS_ENABLED(CONFIG_CMA) && !IS_MODULE(CONFIG_OPTEE); bool sdp = optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_SDP; struct tee_shm_pool *pool; int rc; @@ -1635,9 +1701,11 @@ static int optee_sdp_pool_init(struct optee *optee) /* * optee_sdp_pools_init() must be called if secure world has any * SDP capability. If the static carvout is available initialize - * and add a pool for that. + * and add a pool for that. If there's an error from secure world + * we complain but don't call optee_sdp_pools_uninit() unless we + * know that there is no SDP capability left. */ - if (!sdp) + if (!dyn_sdp && !sdp) return 0;
rc = optee_rstmem_pools_init(optee); @@ -1654,7 +1722,9 @@ static int optee_sdp_pool_init(struct optee *optee) 0, &res.smccc); if (res.result.status != OPTEE_SMC_RETURN_OK) { pr_err("Secure Data Path service not available\n"); - goto err; + if (!dyn_sdp) + goto err; + return 0; }
pool = tee_rstmem_gen_pool_alloc(res.result.start,