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

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Message-ID: <29c7b5b9-3a27-4b3c-85af-e08287944a00@amd.com>
Date: Tue, 22 Oct 2024 10:41:13 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Borislav Petkov <bp@...en8.de>
Cc: 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>,
 Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Subject: Re: [PATCH v2 4/5] x86/cpu: Add CPU type to struct cpuinfo_topology

On 10/22/2024 07:03, Borislav Petkov wrote:
> On Tue, Oct 22, 2024 at 01:57:20PM +0200, Borislav Petkov wrote:
>> diff --git a/arch/x86/kernel/cpu/topology_common.c b/arch/x86/kernel/cpu/topology_common.c
>> index 9a6069e7133c..38220b64c6b3 100644
>> --- a/arch/x86/kernel/cpu/topology_common.c
>> +++ b/arch/x86/kernel/cpu/topology_common.c
>> @@ -27,6 +27,23 @@ void topology_set_dom(struct topo_scan *tscan, enum x86_topology_domains dom,
>>   	}
>>   }
>>   
>> +const char *get_topology_cpu_type_name(struct cpuinfo_x86 *c)
>> +{
>> +	enum x86_topology_cpu_type type;
>> +
>> +	if (c->x86_vendor == X86_VENDOR_INTEL)
>> +		type = get_intel_cpu_type(c);
>> +	if (c->x86_vendor == X86_VENDOR_AMD)
>> +		type = get_amd_cpu_type(c);
>> +
>> +	if (type == TOPO_CPU_TYPE_PERFORMANCE)
>> +		return "performance";
>> +	else if (type == TOPO_CPU_TYPE_EFFICIENCY)
>> +		return "efficiency";
>> +	else
>> +		return "unknown";
>> +}
> 
> I guess you still need topology_cpu_type() in your next patch but that's easy
> - you simply call it in get_topology_cpu_type_name().
> 
> The point being debugfs will dump the name of the core type and not some magic
> number which no one knows.

Yeah; makes sense.  I'll pull your suggestions in.