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optee: smc abi: dynamic protected memory allocation

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Add support in the OP-TEE backend driver for dynamic protected memory
allocation using the SMC ABI.

Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Jens Wiklander
2025-08-13 08:02:58 +02:00
parent 2b78d79cdf
commit dbc2868b7b
1 changed files with 75 additions and 3 deletions
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78
drivers/tee/optee/smc_abi.c
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@@ -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,
u32 *mem_attrs, unsigned int ma_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)
@@ -1627,14 +1693,20 @@ 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);