static void optee_handle_rpc()

in optee/smc_abi.c [768:816]

• 41 lines of code
• 7 McCabe index (conditional complexity)

static void optee_handle_rpc(struct tee_context *ctx,
			     struct optee_rpc_param *param,
			     struct optee_call_ctx *call_ctx)
{
	struct tee_device *teedev = ctx->teedev;
	struct optee *optee = tee_get_drvdata(teedev);
	struct tee_shm *shm;
	phys_addr_t pa;

	switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
	case OPTEE_SMC_RPC_FUNC_ALLOC:
		shm = tee_shm_alloc(ctx, param->a1,
				    TEE_SHM_MAPPED | TEE_SHM_PRIV);
		if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
			reg_pair_from_64(&param->a1, &param->a2, pa);
			reg_pair_from_64(&param->a4, &param->a5,
					 (unsigned long)shm);
		} else {
			param->a1 = 0;
			param->a2 = 0;
			param->a4 = 0;
			param->a5 = 0;
		}
		kmemleak_not_leak(shm);
		break;
	case OPTEE_SMC_RPC_FUNC_FREE:
		shm = reg_pair_to_ptr(param->a1, param->a2);
		tee_shm_free(shm);
		break;
	case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
		/*
		 * A foreign interrupt was raised while secure world was
		 * executing, since they are handled in Linux a dummy RPC is
		 * performed to let Linux take the interrupt through the normal
		 * vector.
		 */
		break;
	case OPTEE_SMC_RPC_FUNC_CMD:
		shm = reg_pair_to_ptr(param->a1, param->a2);
		handle_rpc_func_cmd(ctx, optee, shm, call_ctx);
		break;
	default:
		pr_warn("Unknown RPC func 0x%x\n",
			(u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
		break;
	}

	param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
}