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From: Borislav Petkov <bp@alien8.de>
To: kan.liang@linux.intel.com
Cc: peterz@infradead.org, acme@kernel.org, mingo@kernel.org,
	linux-kernel@vger.kernel.org, tglx@linutronix.de,
	namhyung@kernel.org, jolsa@redhat.com, ak@linux.intel.com,
	yao.jin@linux.intel.com, alexander.shishkin@linux.intel.com,
	adrian.hunter@intel.com,
	Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
	Len Brown <len.brown@intel.com>, Tony Luck <tony.luck@intel.com>
Subject: Re: [PATCH 02/49] x86/cpu: Describe hybrid CPUs in cpuinfo_x86
Date: Mon, 8 Feb 2021 18:56:40 +0100	[thread overview]
Message-ID: <20210208175640.GD18227@zn.tnic> (raw)
In-Reply-To: <1612797946-18784-3-git-send-email-kan.liang@linux.intel.com>

On Mon, Feb 08, 2021 at 07:24:59AM -0800, kan.liang@linux.intel.com wrote:
> diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
> index c20a52b..1f25ac9 100644
> --- a/arch/x86/include/asm/processor.h
> +++ b/arch/x86/include/asm/processor.h
> @@ -139,6 +139,16 @@ struct cpuinfo_x86 {
>  	u32			microcode;
>  	/* Address space bits used by the cache internally */
>  	u8			x86_cache_bits;
> +	/*
> +	 * In hybrid processors, there is a CPU type and a native model ID. The
> +	 * CPU type (x86_cpu_type[31:24]) describes the type of micro-
> +	 * architecture families. The native model ID (x86_cpu_type[23:0])
> +	 * describes a specific microarchitecture version. Combining both
> +	 * allows to uniquely identify a CPU.
> +	 *
> +	 * Please note that the native model ID is not related to x86_model.
> +	 */
> +	u32			x86_cpu_type;

Why are you adding it here instead of simply using
X86_FEATURE_HYBRID_CPU at the call site?

How many uses in this patchset?

/me searches...

Exactly one.

Just query X86_FEATURE_HYBRID_CPU at the call site and read what you
need from CPUID and use it there - no need for this.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  reply	other threads:[~2021-02-08 19:16 UTC|newest]

Thread overview: 82+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-08 15:24 [PATCH 00/49] Add Alder Lake support for perf kan.liang
2021-02-08 15:24 ` [PATCH 01/49] x86/cpufeatures: Enumerate Intel Hybrid Technology feature bit kan.liang
2021-02-08 15:24 ` [PATCH 02/49] x86/cpu: Describe hybrid CPUs in cpuinfo_x86 kan.liang
2021-02-08 17:56   ` Borislav Petkov [this message]
2021-02-08 19:04     ` Liang, Kan
2021-02-08 19:10       ` Luck, Tony
2021-02-08 19:19         ` Borislav Petkov
2021-02-08 15:25 ` [PATCH 03/49] perf/x86/intel: Hybrid PMU support for perf capabilities kan.liang
2021-02-08 15:25 ` [PATCH 04/49] perf/x86: Hybrid PMU support for intel_ctrl kan.liang
2021-02-08 15:25 ` [PATCH 05/49] perf/x86: Hybrid PMU support for counters kan.liang
2021-02-08 15:25 ` [PATCH 06/49] perf/x86: Hybrid PMU support for unconstrained kan.liang
2021-02-08 15:25 ` [PATCH 07/49] perf/x86: Hybrid PMU support for hardware cache event kan.liang
2021-02-08 15:25 ` [PATCH 08/49] perf/x86: Hybrid PMU support for event constraints kan.liang
2021-02-08 15:25 ` [PATCH 09/49] perf/x86: Hybrid PMU support for extra_regs kan.liang
2021-02-08 15:25 ` [PATCH 10/49] perf/x86/intel: Factor out intel_pmu_check_num_counters kan.liang
2021-02-08 15:25 ` [PATCH 11/49] perf/x86/intel: Factor out intel_pmu_check_event_constraints kan.liang
2021-02-08 15:25 ` [PATCH 12/49] perf/x86/intel: Factor out intel_pmu_check_extra_regs kan.liang
2021-02-08 15:25 ` [PATCH 13/49] perf/x86: Expose check_hw_exists kan.liang
2021-02-08 15:25 ` [PATCH 14/49] perf/x86: Remove temporary pmu assignment in event_init kan.liang
2021-02-08 15:25 ` [PATCH 15/49] perf/x86: Factor out x86_pmu_show_pmu_cap kan.liang
2021-02-08 15:25 ` [PATCH 16/49] perf/x86: Register hybrid PMUs kan.liang
2021-02-08 15:25 ` [PATCH 17/49] perf/x86: Add structures for the attributes of Hybrid PMUs kan.liang
2021-02-08 15:25 ` [PATCH 18/49] perf/x86/intel: Add attr_update for " kan.liang
2021-02-08 15:25 ` [PATCH 19/49] perf/x86: Support filter_match callback kan.liang
2021-02-08 15:25 ` [PATCH 20/49] perf/x86/intel: Add Alder Lake Hybrid support kan.liang
2021-02-08 15:25 ` [PATCH 21/49] perf: Introduce PERF_TYPE_HARDWARE_PMU and PERF_TYPE_HW_CACHE_PMU kan.liang
2021-02-08 15:25 ` [PATCH 22/49] perf/x86/intel/uncore: Add Alder Lake support kan.liang
2021-02-09  4:18   ` kernel test robot
2021-02-08 15:25 ` [PATCH 23/49] perf/x86/msr: Add Alder Lake CPU support kan.liang
2021-02-09  3:58   ` kernel test robot
2021-02-09 13:44     ` Liang, Kan
2021-02-09  5:15   ` kernel test robot
2021-02-08 15:25 ` [PATCH 24/49] perf/x86/cstate: " kan.liang
2021-02-08 15:25 ` [PATCH 25/49] perf/x86/rapl: Add support for Intel Alder Lake kan.liang
2021-02-09  5:16   ` kernel test robot
2021-02-08 15:25 ` [PATCH 26/49] perf jevents: Support unit value "cpu_core" and "cpu_atom" kan.liang
2021-02-08 15:25 ` [PATCH 27/49] perf util: Save pmu name to struct perf_pmu_alias kan.liang
2021-02-08 18:57   ` Arnaldo Carvalho de Melo
2021-02-09  0:17     ` Jin, Yao
2021-02-08 15:25 ` [PATCH 28/49] perf pmu: Save detected hybrid pmus to a global pmu list kan.liang
2021-02-08 18:55   ` Arnaldo Carvalho de Melo
2021-02-09  0:05     ` Jin, Yao
2021-02-08 15:25 ` [PATCH 29/49] perf pmu: Add hybrid helper functions kan.liang
2021-02-08 15:25 ` [PATCH 30/49] perf list: Support --cputype option to list hybrid pmu events kan.liang
2021-02-08 15:25 ` [PATCH 31/49] perf stat: Hybrid evsel uses its own cpus kan.liang
2021-02-08 15:25 ` [PATCH 32/49] perf header: Support HYBRID_TOPOLOGY feature kan.liang
2021-02-08 19:05   ` Arnaldo Carvalho de Melo
2021-02-09  0:26     ` Jin, Yao
2021-02-08 15:25 ` [PATCH 33/49] perf header: Support hybrid CPU_PMU_CAPS kan.liang
2021-02-08 15:25 ` [PATCH 34/49] tools headers uapi: Update tools's copy of linux/perf_event.h kan.liang
2021-02-08 15:25 ` [PATCH 35/49] perf parse-events: Create two hybrid hardware events kan.liang
2021-02-08 18:59   ` Arnaldo Carvalho de Melo
2021-02-09  0:23     ` Jin, Yao
2021-02-08 15:25 ` [PATCH 36/49] perf parse-events: Create two hybrid cache events kan.liang
2021-02-08 15:25 ` [PATCH 37/49] perf parse-events: Support hardware events inside PMU kan.liang
2021-02-08 15:25 ` [PATCH 38/49] perf list: Display pmu prefix for partially supported hybrid cache events kan.liang
2021-02-08 15:25 ` [PATCH 39/49] perf parse-events: Support hybrid raw events kan.liang
2021-02-08 19:07   ` Arnaldo Carvalho de Melo
2021-02-09  0:28     ` Jin, Yao
2021-02-08 15:25 ` [PATCH 40/49] perf stat: Support --cputype option for hybrid events kan.liang
2021-02-08 15:25 ` [PATCH 41/49] perf stat: Support metrics with " kan.liang
2021-02-08 15:25 ` [PATCH 42/49] perf evlist: Create two hybrid 'cycles' events by default kan.liang
2021-02-08 15:25 ` [PATCH 43/49] perf stat: Add default hybrid events kan.liang
2021-02-08 19:10   ` Arnaldo Carvalho de Melo
2021-02-09  0:36     ` Jin, Yao
2021-02-08 15:25 ` [PATCH 44/49] perf stat: Uniquify hybrid event name kan.liang
2021-02-08 15:25 ` [PATCH 45/49] perf stat: Merge event counts from all hybrid PMUs kan.liang
2021-02-08 15:25 ` [PATCH 46/49] perf stat: Filter out unmatched aggregation for hybrid event kan.liang
2021-02-08 19:16   ` Arnaldo Carvalho de Melo
2021-02-09  0:53     ` Jin, Yao
2021-02-08 15:25 ` [PATCH 47/49] perf evlist: Warn as events from different hybrid PMUs in a group kan.liang
2021-02-08 15:25 ` [PATCH 48/49] perf Documentation: Document intel-hybrid support kan.liang
2021-02-08 15:25 ` [PATCH 49/49] perf evsel: Adjust hybrid event and global event mixed group kan.liang
2021-02-08 19:12   ` Arnaldo Carvalho de Melo
2021-02-09  0:47     ` Jin, Yao
2021-02-11 11:40 ` [PATCH 00/49] Add Alder Lake support for perf Jiri Olsa
2021-02-11 16:22   ` Liang, Kan
2021-02-18  0:07     ` Jin, Yao
2021-03-04 15:50 ` Liang, Kan
2021-03-04 17:50   ` Peter Zijlstra
2021-03-05 11:14     ` Peter Zijlstra
2021-03-05 13:36       ` Liang, Kan

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