linux-kernel - Re: [PATCH v7 7/8] perf jevents: Add support for Arm CMN PMU aliasing

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Message-ID: <46a0917c-e288-7ef9-d72d-cdd53bb52a0a@arm.com>
Date:   Wed, 23 Aug 2023 10:33:23 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Jing Zhang <renyu.zj@...ux.alibaba.com>,
        John Garry <john.g.garry@...cle.com>,
        Ian Rogers <irogers@...gle.com>
Cc:     Will Deacon <will@...nel.org>, James Clark <james.clark@....com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-doc@...r.kernel.org,
        Zhuo Song <zhuo.song@...ux.alibaba.com>,
        Shuai Xue <xueshuai@...ux.alibaba.com>
Subject: Re: [PATCH v7 7/8] perf jevents: Add support for Arm CMN PMU aliasing

On 2023-08-21 09:36, Jing Zhang wrote:
> Currently just add aliases for part of Arm CMN PMU events which
> are general and compatible for any SoC and CMN-ANY.
> 
> "Compat" value "434*;436*;43c*;43a*" means it is compatible with
> all CMN600/CMN650/CMN700/Ci700, which can be obtained from
> commit 7819e05a0dce ("perf/arm-cmn: Revamp model detection").
> 
> The arm-cmn PMU events got from:
> [0] https://developer.arm.com/documentation/100180/0302/?lang=en
> [1] https://developer.arm.com/documentation/101408/0100/?lang=en
> [2] https://developer.arm.com/documentation/102308/0302/?lang=en
> [3] https://developer.arm.com/documentation/101569/0300/?lang=en
> 
> Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>
> Reviewed-by: John Garry <john.g.garry@...cle.com>
> ---
>   .../pmu-events/arch/arm64/arm/cmn/sys/cmn.json     | 266 +++++++++++++++++++++
>   tools/perf/pmu-events/jevents.py                   |   1 +
>   2 files changed, 267 insertions(+)
>   create mode 100644 tools/perf/pmu-events/arch/arm64/arm/cmn/sys/cmn.json
> 
> diff --git a/tools/perf/pmu-events/arch/arm64/arm/cmn/sys/cmn.json b/tools/perf/pmu-events/arch/arm64/arm/cmn/sys/cmn.json
> new file mode 100644
> index 0000000..30435a3
> --- /dev/null
> +++ b/tools/perf/pmu-events/arch/arm64/arm/cmn/sys/cmn.json
> @@ -0,0 +1,266 @@
> +[
> +	{
> +		"EventName": "hnf_cache_miss",
> +		"EventIdCode": "0x1",
> +		"NodeType": "0x5",

Given my other comment, I also think there would be no harm in just 
having these as:
	
		"ConfigCode" : "0x10005"

if you'd rather make life easier to begin with, then be able to come 
back and improve things later. IMO it doesn't affect the readability of 
the important values *all* that much, since it's not like they're tighly 
packed together in oddly-aligned bitfields.

Thanks,
Robin.

> +		"BriefDescription": "Counts total cache misses in first lookup result (high priority).",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_slc_sf_cache_access",
> +		"EventIdCode": "0x2",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of cache accesses in first access (high priority).",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_cache_fill",
> +		"EventIdCode": "0x3",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts total allocations in HN SLC (all cache line allocations to SLC).",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_pocq_retry",
> +		"EventIdCode": "0x4",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of retried requests.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_pocq_reqs_recvd",
> +		"EventIdCode": "0x5",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of requests that HN receives.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_sf_hit",
> +		"EventIdCode": "0x6",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of SF hits.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_sf_evictions",
> +		"EventIdCode": "0x7",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of SF eviction cache invalidations initiated.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_dir_snoops_sent",
> +		"EventIdCode": "0x8",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of directed snoops sent (not including SF back invalidation).",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_brd_snoops_sent",
> +		"EventIdCode": "0x9",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of multicast snoops sent (not including SF back invalidation).",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_slc_eviction",
> +		"EventIdCode": "0xa",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of SLC evictions (dirty only).",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_slc_fill_invalid_way",
> +		"EventIdCode": "0xb",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of SLC fills to an invalid way.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_mc_retries",
> +		"EventIdCode": "0xc",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of retried transactions by the MC.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_mc_reqs",
> +		"EventIdCode": "0xd",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of requests that are sent to MC.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hnf_qos_hh_retry",
> +		"EventIdCode": "0xe",
> +		"NodeType": "0x5",
> +		"BriefDescription": "Counts number of times a HighHigh priority request is protocolretried at the HN‑F.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "rnid_s0_rdata_beats",
> +		"EventIdCode": "0x1",
> +		"NodeType": "0xa",
> +		"BriefDescription": "Number of RData beats (RVALID and RREADY) dispatched on port 0. This event measures the read bandwidth, including CMO responses.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "rnid_s1_rdata_beats",
> +		"EventIdCode": "0x2",
> +		"NodeType": "0xa",
> +		"BriefDescription": "Number of RData beats (RVALID and RREADY) dispatched on port 1. This event measures the read bandwidth, including CMO responses.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "rnid_s2_rdata_beats",
> +		"EventIdCode": "0x3",
> +		"NodeType": "0xa",
> +		"BriefDescription": "Number of RData beats (RVALID and RREADY) dispatched on port 2. This event measures the read bandwidth, including CMO responses.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "rnid_rxdat_flits",
> +		"EventIdCode": "0x4",
> +		"NodeType": "0xa",
> +		"BriefDescription": "Number of RXDAT flits received. This event measures the true read data bandwidth, excluding CMOs.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "rnid_txdat_flits",
> +		"EventIdCode": "0x5",
> +		"NodeType": "0xa",
> +		"BriefDescription": "Number of TXDAT flits dispatched. This event measures the write bandwidth.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "rnid_txreq_flits_total",
> +		"EventIdCode": "0x6",
> +		"NodeType": "0xa",
> +		"BriefDescription": "Number of TXREQ flits dispatched. This event measures the total request bandwidth.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "rnid_txreq_flits_retried",
> +		"EventIdCode": "0x7",
> +		"NodeType": "0xa",
> +		"BriefDescription": "Number of retried TXREQ flits dispatched. This event measures the retry rate.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "sbsx_txrsp_retryack",
> +		"EventIdCode": "0x4",
> +		"NodeType": "0x7",
> +		"BriefDescription": "Number of RXREQ flits dispatched. This event is a measure of the retry rate.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "sbsx_txdat_flitv",
> +		"EventIdCode": "0x5",
> +		"NodeType": "0x7",
> +		"BriefDescription": "Number of TXDAT flits dispatched from XP to SBSX. This event is a measure of the write bandwidth.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "sbsx_arvalid_no_arready",
> +		"EventIdCode": "0x21",
> +		"NodeType": "0x7",
> +		"BriefDescription": "Number of cycles the SBSX bridge is stalled because of backpressure on AR channel.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "sbsx_awvalid_no_awready",
> +		"EventIdCode": "0x22",
> +		"NodeType": "0x7",
> +		"BriefDescription": "Number of cycles the SBSX bridge is stalled because of backpressure on AW channel.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "sbsx_wvalid_no_wready",
> +		"EventIdCode": "0x23",
> +		"NodeType": "0x7",
> +		"BriefDescription": "Number of cycles the SBSX bridge is stalled because of backpressure on W channel.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hni_txrsp_retryack",
> +		"EventIdCode": "0x2a",
> +		"NodeType": "0x4",
> +		"BriefDescription": "Number of RXREQ flits dispatched. This event is a measure of the retry rate.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hni_arvalid_no_arready",
> +		"EventIdCode": "0x2b",
> +		"NodeType": "0x4",
> +		"BriefDescription": "Number of cycles the HN-I bridge is stalled because of backpressure on AR channel.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hni_arready_no_arvalid",
> +		"EventIdCode": "0x2c",
> +		"NodeType": "0x4",
> +		"BriefDescription": "Number of cycles the AR channel is waiting for new requests from HN-I bridge.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hni_awvalid_no_awready",
> +		"EventIdCode": "0x2d",
> +		"NodeType": "0x4",
> +		"BriefDescription": "Number of cycles the HN-I bridge is stalled because of backpressure on AW channel.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hni_awready_no_awvalid",
> +		"EventIdCode": "0x2e",
> +		"NodeType": "0x4",
> +		"BriefDescription": "Number of cycles the AW channel is waiting for new requests from HN-I bridge.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hni_wvalid_no_wready",
> +		"EventIdCode": "0x2f",
> +		"NodeType": "0x4",
> +		"BriefDescription": "Number of cycles the HN-I bridge is stalled because of backpressure on W channel.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	},
> +	{
> +		"EventName": "hni_txdat_stall",
> +		"EventIdCode": "0x30",
> +		"NodeType": "0x4",
> +		"BriefDescription": "TXDAT valid but no link credit available.",
> +		"Unit": "arm_cmn",
> +		"Compat": "434*;436*;43c*;43a*"
> +	}
> +]
> diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
> index 369c8bf..935bd4b 100755
> --- a/tools/perf/pmu-events/jevents.py
> +++ b/tools/perf/pmu-events/jevents.py
> @@ -272,6 +272,7 @@ class JsonEvent:
>             'DFPMC': 'amd_df',
>             'cpu_core': 'cpu_core',
>             'cpu_atom': 'cpu_atom',
> +          'arm_cmn': 'arm_cmn',
>         }
>         return table[unit] if unit in table else f'uncore_{unit.lower()}'
>