linux-kernel - Re: [PATCH RESEND 1/2] MIPS: cacheinfo: Add missing VCache

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Message-ID: <20200821165539.GA15948@alpha.franken.de>
Date:   Fri, 21 Aug 2020 18:55:39 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     linux-mips@...r.kernel.org, Huacai Chen <chenhc@...ote.com>,
        Vladimir Kondratiev <vladimir.kondratiev@...el.com>,
        Paul Burton <paulburton@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 1/2] MIPS: cacheinfo: Add missing VCache

On Thu, Aug 20, 2020 at 08:42:49AM +0800, Jiaxun Yang wrote:
> Victim Cache is defined by Loongson as per-core unified
> private Cache.
> Add this into cacheinfo and make cache levels selfincrement
> instead of hardcode levels.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
>  arch/mips/kernel/cacheinfo.c | 34 ++++++++++++++++++++++++++--------
>  1 file changed, 26 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/mips/kernel/cacheinfo.c b/arch/mips/kernel/cacheinfo.c
> index 47312c529410..83548331ee94 100644
> --- a/arch/mips/kernel/cacheinfo.c
> +++ b/arch/mips/kernel/cacheinfo.c
> @@ -35,6 +35,11 @@ static int __init_cache_level(unsigned int cpu)
>  
>  	leaves += (c->icache.waysize) ? 2 : 1;
>  
> +	if (c->vcache.waysize) {
> +		levels++;
> +		leaves++;
> +	}
> +
>  	if (c->scache.waysize) {
>  		levels++;
>  		leaves++;
> @@ -74,25 +79,38 @@ static int __populate_cache_leaves(unsigned int cpu)
>  	struct cpuinfo_mips *c = &current_cpu_data;
>  	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
>  	struct cacheinfo *this_leaf = this_cpu_ci->info_list;
> +	int level = 1;
>  
>  	if (c->icache.waysize) {
> -		/* L1 caches are per core */
> +		/* D/I caches are per core */
>  		fill_cpumask_siblings(cpu, &this_leaf->shared_cpu_map);
> -		populate_cache(dcache, this_leaf, 1, CACHE_TYPE_DATA);
> +		populate_cache(dcache, this_leaf, level, CACHE_TYPE_DATA);
>  		fill_cpumask_siblings(cpu, &this_leaf->shared_cpu_map);
> -		populate_cache(icache, this_leaf, 1, CACHE_TYPE_INST);
> +		populate_cache(icache, this_leaf, level, CACHE_TYPE_INST);
> +		level++;
>  	} else {
> -		populate_cache(dcache, this_leaf, 1, CACHE_TYPE_UNIFIED);
> +		populate_cache(dcache, this_leaf, level, CACHE_TYPE_UNIFIED);
> +		level++;
> +	}
> +
> +	if (c->vcache.waysize) {

why can't we insert vcache as level 4 and leave the rest of the file
alone ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]