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SubjectRe: [PATCH 3/6] perf cs-etm: Save TRCDEVARCH register
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On 31/07/2021 07:37, Leo Yan wrote:
> I checked ETMv4.3 and ETMv4.4 spec (ARM IHI0064E for ETMv4.3 and ARM
> IHI0064F for ETMv4.4), both clarify ETMv4 has the register TRCDEVARCH;
> thus TRCDEVARCH is not a new register introduced by ETE.
>
> For this case, it's good to directly add a new field in the metadata
> array for recording register TRCDEVARCH.

This might be true, but the OpenCSD library doesn't take TRCDEVARCH as a config
parameter for ETMv4 so it couldn't be used. This is the struct:

typedef struct _ocsd_etmv4_cfg
{
uint32_t reg_idr0; /**< ID0 register */
uint32_t reg_idr1; /**< ID1 register */
uint32_t reg_idr2; /**< ID2 register */
uint32_t reg_idr8;
uint32_t reg_idr9;
uint32_t reg_idr10;
uint32_t reg_idr11;
uint32_t reg_idr12;
uint32_t reg_idr13;
uint32_t reg_configr; /**< Config Register */
uint32_t reg_traceidr; /**< Trace Stream ID register */
ocsd_arch_version_t arch_ver; /**< Architecture version */
ocsd_core_profile_t core_prof; /**< Core Profile */
} ocsd_etmv4_cfg;

And this is ETE where TRCDEVARCH is used:

typedef struct _ocsd_ete_cfg
{
uint32_t reg_idr0; /**< ID0 register */
uint32_t reg_idr1; /**< ID1 register */
uint32_t reg_idr2; /**< ID2 register */
uint32_t reg_idr8; /**< ID8 - maxspec */
uint32_t reg_devarch; /**< DevArch register */
uint32_t reg_configr; /**< Config Register */
uint32_t reg_traceidr; /**< Trace Stream ID register */
ocsd_arch_version_t arch_ver; /**< Architecture version */
ocsd_core_profile_t core_prof; /**< Core Profile */
} ocsd_ete_cfg;

Thanks
James

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