linux-kernel - Re: [PATCH PATCH 1/9] x86/cpu/topology: Add x86_cpu_type to struct cpuinfo

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Message-ID: <f4242edf-6c78-421c-8e21-63627b13c35f@citrix.com>
Date: Mon, 17 Jun 2024 10:35:15 +0100
From: Andrew Cooper <andrew.cooper3@...rix.com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org
Cc: daniel.sneddon@...ux.intel.com, tony.luck@...el.com,
 linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
 linux-perf-users@...r.kernel.org, Josh Poimboeuf <jpoimboe@...nel.org>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
 "Liang, Kan" <kan.liang@...ux.intel.com>
Subject: Re: [PATCH PATCH 1/9] x86/cpu/topology: Add x86_cpu_type to struct
 cpuinfo_topology

On 17/06/2024 10:11 am, Pawan Gupta wrote:
> diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
> index cb4f6c513c48..f310a7fb4e00 100644
> --- a/arch/x86/include/asm/processor.h
> +++ b/arch/x86/include/asm/processor.h
> @@ -95,6 +95,9 @@ struct cpuinfo_topology {
>  	// Core ID relative to the package
>  	u32			core_id;
>  
> +	// CPU-type e.g. performance, efficiency etc.
> +	u8			cpu_type;
> +

End of the structure?  At least that way new additions are less likely
to add more padding.

> diff --git a/arch/x86/kernel/cpu/topology_common.c b/arch/x86/kernel/cpu/topology_common.c
> index 9a6069e7133c..be82c8769bb2 100644
> --- a/arch/x86/kernel/cpu/topology_common.c
> +++ b/arch/x86/kernel/cpu/topology_common.c
> @@ -140,6 +140,14 @@ static void parse_topology(struct topo_scan *tscan, bool early)
>  	}
>  }
>  
> +static void topo_set_cpu_type(struct cpuinfo_x86 *c)
> +{
> +	c->topo.cpu_type = X86_CPU_TYPE_UNKNOWN;
> +
> +	if (c->x86_vendor == X86_VENDOR_INTEL && cpuid_eax(0) >= 0x1a)

c->cpuid_level ?

~Andrew