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- Qualcomm Technologies, Inc. FastRPC Driver
- The MSM FastRPC driver implements an IPC (Inter-Processor Communication)
- mechanism that allows for clients to transparently make remote method
- invocations across DSP and APPS boundaries. This enables developers
- to offload tasks to the DSP and free up the application processor for
- other tasks.
- Required properties:
- - compatible : Must be one of "qcom,msm-fastrpc-adsp" or
- "qcom,msm-fastrpc-compute"
- Optional properties:
- - qcom,fastrpc-glink: Flag to use glink instead of smd for IPC
- - qcom,rpc-latency-us: FastRPC QoS latency vote
- - qcom,adsp-remoteheap-vmid: FastRPC remote heap VMID list
- - qcom,fastrpc-adsp-audio-pdr: Flag to enable ADSP Audio PDR
- - qcom,fastrpc-adsp-sensors-pdr: Flag to enable Sensors PDR
- - qcom,secure-domains: FastRPC secure domain configuration
- Optional subnodes:
- - qcom,msm_fastrpc_compute_cb : Child nodes representing the compute context
- banks
- Subnode Required properties:
- - compatible : Must be "qcom,msm-fastrpc-compute-cb"
- - label: Label describing the channel this context bank belongs to
- - iommus : A list of phandle and IOMMU specifier pairs that describe the
- IOMMU master interfaces of the device
- Subnode Optional properties:
- - shared-cb : Present if context bank need to be shared
- Example:
- qcom,msm_fastrpc {
- compatible = "qcom,msm-fastrpc-adsp";
- qcom,fastrpc-glink;
- qcom,rpc-latency-us = <2343>;
- qcom,adsp-remoteheap-vmid = <22 37>;
- qcom,fastrpc-adsp-sensors-pdr;
- qcom,msm_fastrpc_compute_cb_1 {
- compatible = "qcom,msm-fastrpc-compute-cb";
- label = "adsprpc-smd";
- iommus = <&lpass_q6_smmu 8>,
- };
- qcom,msm_fastrpc_compute_cb_2 {
- compatible = "qcom,msm-fastrpc-compute-cb";
- label = "adsprpc-smd";
- iommus = <&lpass_q6_smmu 9>,
- shared-cb;
- };
- };
- Legacy SMMU v1/v2:
- Required properties:
- - compatible : Must be "qcom,msm-fastrpc-legacy-compute"
- Required subnode:
- - qcom,msm_fastrpc_compute_cb : Child nodes representing the compute context
- banks
- Required subnode properties:
- - compatible : Must be "qcom,msm-fastrpc-legacy-compute-cb"
- - label : Label describing the channel this context bank belongs to
- - iommus : A list of phandle and IOMMU specifier pairs that describe the
- IOMMU master interfaces of the device
- - sids : A list of SID associated with the context bank
- Example:
- qcom,msm_fastrpc {
- compatible = "qcom,msm-fastrpc-legacy-compute";
- qcom,msm_fastrpc_compute_cb {
- compatible = "qcom,msm-fastrpc-legacy-compute-cb";
- label = "adsprpc-smd";
- iommus = <&apps_iommu 0x2408 0x7>;
- sids = <0x8 0x9 0xa 0xb 0xc 0xd 0xe 0xf>;
- };
- };
- Remote Heap:
- Required properties:
- - compatible : Must be "qcom,msm-adsprpc-mem-region"
- - memory-region : CMA region which is owned by this device
- - restrict-access : Blocking vote for hyp_assign_phys function call
- Example:
- qcom,adsprpc-mem {
- compatible = "qcom,msm-adsprpc-mem-region";
- memory-region = <&adsp_mem>;
- restrict-access;
- };
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