linux-kernel - Re: [PATCH v2 4/5] x86/cpu: Add CPU type to struct cpuinfo

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Message-ID: <20241023155916.GCZxkdVGlNTr461XG4@fat_crate.local>
Date: Wed, 23 Oct 2024 17:59:16 +0200
From: Borislav Petkov <bp@...en8.de>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: Mario Limonciello <mario.limonciello@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>,
	Perry Yuan <perry.yuan@....com>,
	Brijesh Singh <brijesh.singh@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Li RongQing <lirongqing@...du.com>,
	"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <linux-kernel@...r.kernel.org>,
	"open list:ACPI" <linux-acpi@...r.kernel.org>,
	"open list:AMD PSTATE DRIVER" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2 4/5] x86/cpu: Add CPU type to struct cpuinfo_topology

On Tue, Oct 22, 2024 at 09:40:15PM -0700, Pawan Gupta wrote:
> get_generic_cpu_type(struct cpuinfo_x86 *c)
> {
>      enum x86_topology_cpu_type type;
> 
> 	if (c->x86_vendor == X86_VENDOR_INTEL) {
> 	     switch (c->topo.intel_type) {
> 		     case 0x20: return TOPO_CPU_TYPE_EFFICIENCY;
> 		     case 0x40: return TOPO_CPU_TYPE_PERFORMANCE;
> 	}
> 	if (c->x86_vendor == X86_VENDOR_AMD) {
> 	     switch (c->topo.amd_type) {
> 		     case 0: return TOPO_CPU_TYPE_PERFORMANCE;
> 		     case 1: return TOPO_CPU_TYPE_EFFICIENCY;
> 	}
> 
> 	return TOPO_CPU_TYPE_UNKNOWN;
> }

Ok...

> get_intel_cpu_type(struct cpuinfo_x86 *c)
> {
> 	return c->topo.intel_type;
> }
> 
> get_amd_cpu_type(struct cpuinfo_x86 *c)
> {
> 	return c->topo.amd_type;

... except those silly wrappers can go. There's a reason cpuinfo_x86 has
well-defined members which can be used directly.

-- 
Regards/Gruss,
    Boris.

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