linux-kernel - Re: [v10, 1/3] powerpc: Detect the presence of big-cores via "ibm, thread-groups"

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Message-Id: <42YPr562wDzB2xb@ozlabs.org>
Date:   Mon, 15 Oct 2018 15:01:09 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Neuling <mikey@...ling.org>,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
        Akshay Adiga <akshay.adiga@...ux.vnet.ibm.com>,
        Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>,
        Anton Blanchard <anton@...ba.org>
Cc:     "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [v10, 1/3] powerpc: Detect the presence of big-cores via "ibm, thread-groups"

On Thu, 2018-10-11 at 05:33:01 UTC, "Gautham R. Shenoy" wrote:
> From: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
> 
> On IBM POWER9, the device tree exposes a property array identifed by
> "ibm,thread-groups" which will indicate which groups of threads share
> a particular set of resources.
> 
> As of today we only have one form of grouping identifying the group of
> threads in the core that share the L1 cache, translation cache and
> instruction data flow.
> 
> This patch adds helper functions to parse the contents of
> "ibm,thread-groups" and populate a per-cpu variable to cache
> information about siblings of each CPU that share the L1, traslation
> cache and instruction data-flow.
> 
> It also defines a new global variable named "has_big_cores" which
> indicates if the cores on this configuration have multiple groups of
> threads that share L1 cache.
> 
> For each online CPU, it maintains a cpu_smallcore_mask, which
> indicates the online siblings which share the L1-cache with it.
> 
> Signed-off-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/425752c63b6f3fed7b5a9cba2b8101

cheers