Hexagon DSP系列记录(三)——DSP工作模式设置

迷南。 2022-11-29 13:10 166阅读 0赞

### Remote file system ###

The Remote File System is used by the loader on the Hexagon DSP to read shared object files. The shared object files are stored on the HLOS’s file system.  
通过编译生成的DSP动态库有两种动态加载方式

1.  within a FastRPC invocation  
    即使用rpcmem\_xxx接口的方式，该方式底层依赖libadsprpc.so，默认查找路径 /vendor/lib/rfsa/dsp;/vendor/dsp，可以使用DSP\_LIBRARY\_PATH人为指定查找路径。
2.  outside of a FastRPC invocation  
    For non-rpc started threads (calling dlopen from static DSP code), a daemon (/vendor/bin/adsprpcd) will provide the context for requests back to the Android environment. Audio modules are loaded this way.(说是在Audio modules里头有用到，但我没找到怎么用的)

### DSP DCVS(dynamic clock voltage scaling) ###

看这几个单词就感觉是**性能功耗相关**的  
sm8150支持DCVS v2，sm8250支持DCVS v3，  
接口对应HAP\_power\_xxxx  
支持performance/owersave mode等模式，或不指定。  
具体设置方法参考：  
file:///E:/Qualcomm/Hexagon\_SDK/3.5.2/docs/Hap\_power\_set\_dcvs\_2.html  
PERFORMANCE\_MODE：

//Vote
    
    /* Populate request structure */
    int retVal;
    HAP_power_request_t request;
    memset(&request, 0, sizeof(HAP_power_request_t)); //Important to clear the structure if only selected fields are updated.
    request.type = HAP_power_set_DCVS_v2;
    request.dcvs_v2.dcvs_enable = TRUE;
    request.dcvs_v2.dcvs_option = HAP_DCVS_V2_PERFORMANCE_MODE;
    request.dcvs_v2.set_latency = TRUE;
    request.dcvs_v2.latency = 1000;
    request.dcvs_v2.set_dcvs_params = TRUE;
    request.dcvs_v2.dcvs_params.min_corner = HAP_DCVS_VCORNER_SVS;
    request.dcvs_v2.dcvs_params.max_corner = HAP_DCVS_VCORNER_TURBO;
    request.dcvs_v2.dcvs_params.target_corner = HAP_DCVS_VCORNER_NOM;
    /* Call HAP_power_set API with the updated request structure */
    retVal = HAP_power_set(NULL, &request);
    ...
    /* 
     * Processing block 
     */
    ...
    //To remove the vote keeping DCVS enabled.
    memset(&request, 0, sizeof(HAP_power_request_t)); //Remove all votes.
    request.type = HAP_power_set_DCVS_v2;
    request.dcvs_v2.dcvs_enable = TRUE;
    request.dcvs_v2.dcvs_option = HAP_DCVS_V2_PERFORMANCE_MODE; //Enable DCVS
    retVal = HAP_power_set(NULL, &request);

POWER\_SAVER\_MODE：

//Vote
    
    /* Populate request structure with dcvs_v2 request*/
    int retVal;
    HAP_power_request_t request;
    memset(&request, 0, sizeof(HAP_power_request_t)); //Important to clear the structure if only selected fields are updated.
    request.type = HAP_power_set_DCVS_v2;
    request.dcvs_v2.dcvs_enable = TRUE;
    request.dcvs_v2.dcvs_option = HAP_DCVS_V2_POWER_SAVER_MODE;
    request.dcvs_v2.set_dcvs_params = TRUE;
    request.dcvs_v2.dcvs_params.min_corner = HAP_DCVS_VCORNER_SVS;
    request.dcvs_v2.dcvs_params.max_corner = HAP_DCVS_VCORNER_TURBO;
    request.dcvs_v2.dcvs_params.target_corner = HAP_DCVS_VCORNER_DISABLE; //no vote
    /* Call HAP_power_set API with the updated request structure */
    retVal = HAP_power_set(NULL, &request);
    ...
    /* 
     * Processing block 
     */
    ...
    //To remove the dcvs_v2 vote keeping DCVS enabled.
    memset(&request, 0, sizeof(HAP_power_request_t)); //Remove all votes.
    request.type = HAP_power_set_DCVS_v2;
    request.dcvs_v2.dcvs_enable = TRUE;
    request.dcvs_v2.dcvs_option = HAP_DCVS_V2_POWER_SAVER_MODE; //Enable DCVS
    retVal = HAP_power_set(NULL, &request);