Re: [PATCH v2 i-g-t] lib/xe/oa: Add support for 192B_MPEC8LL_NOA16 OAM format

[Shekhar Chauhan <shekhar.chauhan@intel.com>]

On 4/17/2026 0:18, Ashutosh Dixit wrote:
> Support for CRI 192B_MPEC8LL_NOA16 OAM format was previously missed
> out. Add it.
>
> v2: Fix B/C counter accumulation (Shekhar C)
>
> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
> ---
>   lib/xe/oa-configs/oa-metricset-codegen.py | 13 +++++++++++-
>   lib/xe/xe_oa.c                            | 24 +++++++++++++++++++++++
>   2 files changed, 36 insertions(+), 1 deletion(-)
>
> diff --git a/lib/xe/oa-configs/oa-metricset-codegen.py b/lib/xe/oa-configs/oa-metricset-codegen.py
> index c5c7a2c8d4..b44d4d73af 100644
The patch itself makes sense now. But there's one change missing in 2 
places. The function "intel_xe_perf_read_record_timestamp" and 
"intel_xe_perf_read_record_timestamp_raw" both need this new format 
recognised there else they'll still fallback to "assert(0)".

Other than that, this looks fine and we can merge it after that.

-shekhar

> --- a/lib/xe/oa-configs/oa-metricset-codegen.py
> +++ b/lib/xe/oa-configs/oa-metricset-codegen.py
> @@ -139,7 +139,7 @@ def generate_metric_sets(args, gen):
>                       metric_set->perfcnt_offset = metric_set->c_offset + 8;
>                   """))
>           elif gen.chipset == "lnl" or gen.chipset == "bmg" or gen.chipset == "ptl" or gen.chipset == "cri":
> -            # See intel_xe_perf_accumulate_reports for the offsets
> +            # See intel_xe_perf_accumulate_reports for the offsets (value of idx variable)
>               if set.oa_format == "128B_MPEC8_NOA16" or set.oa_format == "128B_MERT_PEC8":
>                   c(textwrap.dedent("""\
>                       metric_set->perf_oa_format = XE_OAM_FORMAT_MPEC8u32_B8_C8;
> @@ -151,6 +151,17 @@ def generate_metric_sets(args, gen):
>                       metric_set->b_offset = metric_set->pec_offset + 8;
>                       metric_set->c_offset = metric_set->b_offset + 8;
>                   """))
> +            elif set.oa_format == "192B_MPEC8LL_NOA16":
> +                c(textwrap.dedent("""\
> +                    metric_set->perf_oa_format = XE_OAM_FORMAT_MPEC8u64_B8_C8;
> +
> +                    metric_set->perf_raw_size = 192;
> +                    metric_set->gpu_time_offset = 0;
> +                    metric_set->gpu_clock_offset = 1;
> +                    metric_set->pec_offset = 2;
> +                    metric_set->b_offset = metric_set->pec_offset + 8;
> +                    metric_set->c_offset = metric_set->b_offset + 8;
> +                """))
>               else:
>                   c(textwrap.dedent("""\
>                       metric_set->perf_oa_format = XE_OA_FORMAT_PEC64u64;
> diff --git a/lib/xe/xe_oa.c b/lib/xe/xe_oa.c
> index b2f447c944..b7be64cc3f 100644
> --- a/lib/xe/xe_oa.c
> +++ b/lib/xe/xe_oa.c
> @@ -875,6 +875,30 @@ void intel_xe_perf_accumulate_reports(struct intel_xe_perf_accumulator *acc,
>   
>   		break;
>   
> +	case XE_OAM_FORMAT_MPEC8u64_B8_C8:
> +		/* 64 bit timestamp */
> +		if (perf->devinfo.oa_timestamp_shift >= 0)
> +			deltas[idx++] += (end64[1] - start64[1]) << perf->devinfo.oa_timestamp_shift;
> +		else
> +			deltas[idx++] += (end64[1] - start64[1]) >> (-perf->devinfo.oa_timestamp_shift);
> +
> +		/* 64 bit clock */
> +		deltas[idx++] += end64[3] - start64[3];
> +
> +		/* 8x 64bit MPEC counters */
> +		for (i = 0; i < 8; i++)
> +			deltas[idx++] += end64[4 + i] - start64[4 + i];
> +
> +		/* 8x 32bit B counters */
> +		for (i = 0; i < 8; i++)
> +			accumulate_uint32(start + 24 + i, end + 24 + i, deltas + idx++);
> +
> +		/* 8x 32bit C counters */
> +		for (i = 0; i < 8; i++)
> +			accumulate_uint32(start + 32 + i, end + 32 + i, deltas + idx++);
> +
> +		break;
> +
>   	case XE_OA_FORMAT_PEC64u64:
>   		/* 64 bit timestamp */
>   		if (perf->devinfo.oa_timestamp_shift >= 0)

-- 
Shekhar Chauhan
Linux Graphics Software Engineer
Intel Corporation