137 lines
5.3 KiB
Text
137 lines
5.3 KiB
Text
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Qualcomm Technologies, Inc. CDSP Request Manager driver
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CDSP Request Manager driver implements an rpmsg interface with
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CDSP subsystem to serve L3 frequency and CPU QoS requests from CDSP.
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It also interacts with NPU, Camera modules for Cx iPeak mitigations and
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thermal module via CDSP/HVX cooling devices for thermal mitigation of
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CDSP core. It sends VTCM partitioning information on supported chipsets
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to CDSP.
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Required properties:
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- compatible: Must be "qcom,msm-cdsprm-rpmsg"
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- qcom,glink-channels: Glink channel for communication with CDSP
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- qcom,intents: A list of <number of intents, size of each intent>
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- qcom,msm-cdsp-rm: A sub-device node to define CDSPM RM, Cx iPeak mitigation
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driver, CDSP core thermal cooling device and CDSP VTCM partitioning
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Required properties:
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- compatible: Must be "qcom,msm-cdsp-rm"
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- qcom,qos-latency-us: pm_qos latency vote to be applied on CDSP request in
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micro seconds
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- qcom,qos-maxhold-ms: Maximum hold time for pm_qos latency vote from CDSP
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in milli seconds
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Optional properties:
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Cx iPeak limit management:
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- qcom,compute-cx-limit-en: To enable CX ipeak limit management for compute
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subsystem
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- qcom,compute-priority-mode: when Cx iPeak mitigation is enabled,
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this field sets desired compute priority mode
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for AIX and HVX concurrency cases based on
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following values, where in HVX and NPU cores,
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if required, are throttled in concurrency based
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on the selected priority mode
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1 : HVX_MAX - Allows HVX to run at maximum possible
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frequency during concurrency with NPU
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2 : AIX_MAX - Allows NPU to run at maximum possible
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frequency during concurrency with HVX
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3 : HVX_OVER_AIX - Allows HVX to run at a higher
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frequency than NPU during concurrency
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4 : AIX_OVER_HVX - Allows NPU to run at a higher
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frequency than HVX during concurrency
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VTCM partitioning:
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- qcom,vtcm-paritions: Number of VTCM partitions (maximum 16)
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- qcom,vtcm-partition-info: Specifies the partitions, their sizes and
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flags. Most importantly flags can be used to
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set some partitions as privileged,
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i.e. only available to privileged clients.
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Currently VTCM_FLAG_PRIMARY(0x1), VTCM_FLAG_SECONDARY (0x2)and
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VTCM_FLAG_PRIVILEGED(0x4) are the supported flags per partition
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(only one per partition).
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Size of each partition should be a multiple of 256KB.
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Given 256KB is the minimum VTCM allocation size,
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256K, 1M, 4M are supported page sizes.
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Specifying a 3MB partition will allow maximum of 1MB page (3x).
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Similarly, a 512KB partition will be of 256KB pages (2x).
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PRIMARY and SECONDARY partitions are available to all the clients while
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the PRIMARY partition is used by default. Partition selection is
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controlled by the vtcm-partition-map information.
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There must be only one PRIMARY partition.
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Partitions must be defined with a linear partition index
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starting with 0 till (Number of VTCM partitions - 1).
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VTCM memory will be partitioned in the order provided
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(0 being the first partition).
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- qcom,vtcm-partition-map: Maps application type identifiers to
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partitions. Clients use application type IDs to
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request non-default partitions.
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Application identifier is specified as a value [0 – 31]
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in the device tree. The default application identifier
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will be 0. Application identifier must be unique for each
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partition map. Any unassigned application identifier
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in the set of [0 – 31] will be mapped to the PRIMARY partition
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and will return failure if there is no
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PRIMARY partition configured.
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Resource manager:
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- qcom,resmgr-pdkill-enable: To enable resource manager PD kill mechanism. When enabled,
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the resource manager (managing VTCM, HMX resources) can kill an
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unsigned process holding any of the resources being
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requested by a privileged process if the release requests sent by
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the resource manager are not acted upon.
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Thermal cooling device:
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- #cooling-cells: Number of cooling cells for CDSP cooling device based on
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CDSP Q6 core clock throttling
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- qcom,msm-hvx-rm: A sub-device node to define HVX based thermal cooling device
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Required properties:
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- compatible: Must be "qcom,msm-hvx-rm"
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- #cooling-cells: Number of cooling cells for CDSP cooling device based on
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HVX hardware throttling
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- qcom,cdsp-l3: A sub-device node to define CDSP L3 target device for L3
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clock voting
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Required properties:
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- compatible: Must be "qcom,cdsp-l3"
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- qcom,target-dev: The DT device that corresponds to the CDSP L3
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devfreq-simple-dev
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Example:
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qcom,msm_cdsprm_rpmsg {
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compatible = "qcom,msm-cdsprm-rpmsg";
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qcom,glink-channels = "cdsprmglink-apps-dsp";
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qcom,intents = <0x14 64>;
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qcom,cdsp-l3 {
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compatible = "qcom,cdsp-l3";
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qcom,target-dev = <&cdsp-cdsp-l3-lat>;
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};
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qcom,msm_cdsp_rm {
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compatible = "qcom,msm-cdsp-rm";
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qcom,qos-latency-us = <100>;
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qcom,qos-maxhold-ms = <20>;
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qcom,compute-cx-limit-en;
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qcom,compute-priority-mode = <2>;
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#cooling-cells = <2>;
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qcom,vtcm-paritions = <4>;
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qcom,vtcm-partition-info = < 0 2048 0x1 >,
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< 1 1024 0x2 >,
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< 2 512 0x4 >,
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< 3 512 0x4 >;
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qcom,vtcm-partition-map = < 0 0 >,
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< 1 0 >,
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< 2 1 >,
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< 30 2 >,
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< 31 3 >;
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};
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msm_hvx_rm: qcom,msm_hvx_rm {
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compatible = "qcom,msm-hvx-rm";
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#cooling-cells = <2>;
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};
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};
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