linux-kernel - Re: [PATCH 02/13] perf/x86/amd: Add IBS OP

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Date:   Thu, 26 May 2022 10:08:54 -0500
From:   Kim Phillips <kim.phillips@....com>
To:     Ravi Bangoria <ravi.bangoria@....com>, peterz@...radead.org,
        acme@...nel.org
Cc:     jolsa@...nel.org, namhyung@...nel.org, eranian@...gle.com,
        irogers@...gle.com, jmario@...hat.com, leo.yan@...aro.org,
        alisaidi@...zon.com, ak@...ux.intel.com, kan.liang@...ux.intel.com,
        dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        tglx@...utronix.de, bp@...en8.de, x86@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        sandipan.das@....com, ananth.narayan@....com,
        santosh.shukla@....com
Subject: Re: [PATCH 02/13] perf/x86/amd: Add IBS OP_DATA2/3 register bit
 definitions

On 5/25/22 4:39 AM, Ravi Bangoria wrote:

Hi Ravi,

> AMD IBS OP_DATA2 and OP_DATA3 provides detail about tagged load/store
> ops. Add definitions for these registers into header file. In addition
> to those, IBS_OP_DATA2 DataSrc provides detail about location of the
> data being accessed from by load ops. Define macros for legacy and
> extended DataSrc values.
> 
> Signed-off-by: Ravi Bangoria <ravi.bangoria@....com>
> ---
>   arch/x86/include/asm/amd-ibs.h | 76 ++++++++++++++++++++++++++++++++++
>   1 file changed, 76 insertions(+)
> 
> diff --git a/arch/x86/include/asm/amd-ibs.h b/arch/x86/include/asm/amd-ibs.h
> index aabdbb5ab920..22184fe20cf0 100644
> --- a/arch/x86/include/asm/amd-ibs.h
> +++ b/arch/x86/include/asm/amd-ibs.h
> @@ -6,6 +6,82 @@
>   
>   #include <asm/msr-index.h>
>   
> +/* IBS_OP_DATA2 Bits */
> +#define IBS_DATA_SRC_HI_SHIFT			6
> +#define IBS_DATA_SRC_HI_MASK			(0x3ULL << IBS_DATA_SRC_HI_SHIFT)

Is there a reason we're not using the existing bitfield
definitions?  E.g., data_src_hi for the case above.

Thanks,

Kim