linux-kernel - Re: [PATCH 05/10] x86/intel_rdt: Add support for Cache Allocation detection

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Message-ID: <20150615124852.GC3644@twins.programming.kicks-ass.net>
Date:	Mon, 15 Jun 2015 14:48:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, vikas.shivappa@...el.com,
	x86@...nel.org, hpa@...or.com, tglx@...utronix.de,
	mingo@...nel.org, matt.fleming@...el.com, will.auld@...el.com,
	linux-rdt@...ists.intel.com
Subject: Re: [PATCH 05/10] x86/intel_rdt: Add support for Cache Allocation
 detection

On Fri, Jun 12, 2015 at 11:17:12AM -0700, Vikas Shivappa wrote:
> +	/* Additional Intel-defined flags: level 0x00000010 */
> +	if (c->cpuid_level >= 0x00000010) {
> +		u32 eax, ebx, ecx, edx;
> +
> +		cpuid_count(0x00000010, 0, &eax, &ebx, &ecx, &edx);
> +		c->x86_capability[13] = ebx;
> +
> +		if (cpu_has(c, X86_FEATURE_CAT_L3)) {
> +
> +			cpuid_count(0x00000010, 1, &eax, &ebx, &ecx, &edx);
> +			c->x86_rdt_max_closid = edx + 1;
> +			c->x86_rdt_max_cbm_len = eax + 1;
> +		}
> +	}

I'm still annoyed by the whole RDT/CAT thing, so the above reads a CAT
leaf and puts the values in an RDT variable.

That's inconsistent.
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