linux-kernel - Re: [PATCH v2] LoongArch: Update the flush cache policy

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Date: Wed, 8 May 2024 08:39:32 +0800
From: lijun <lijun01@...inos.cn>
To: chenhuacai@...nel.org, kernel@...0n.name, lvjianmin@...ngson.cn,
 dongbiao@...ngson.cn, zhangbaoqi@...ngson.cn
Cc: loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] LoongArch: Update the flush cache policy

Superseded.

在 2024/5/7 15:43, Li Jun 写道:
> fix when LoongArch s3 resume, Can't find image information
>
> Signed-off-by: Li Jun <lijun01@...inos.cn>
> Signed-off-by: Baoqi Zhang <zhangbaoqi@...ngson.cn>
> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
> Signed-off-by: Biao Dong <dongbiao@...ngson.cn>
> ---
>   arch/loongarch/mm/cache.c | 23 ++++++++++++++++++++++-
>   1 file changed, 22 insertions(+), 1 deletion(-)
>
> diff --git a/arch/loongarch/mm/cache.c b/arch/loongarch/mm/cache.c
> index 6be04d36ca07..89eeb9a97dd5 100644
> --- a/arch/loongarch/mm/cache.c
> +++ b/arch/loongarch/mm/cache.c
> @@ -63,6 +63,27 @@ static void flush_cache_leaf(unsigned int leaf)
>   	} while (--nr_nodes > 0);
>   }
>   
> +static void flush_cache_last_level(unsigned int leaf)
> +{
> +	u64 addr;
> +	int i, j, nr_nodes;
> +	struct cache_desc *cdesc = current_cpu_data.cache_leaves + leaf;
> +
> +	nr_nodes = loongson_sysconf.nr_nodes;
> +
> +	addr = CSR_DMW1_BASE;
> +	iocsr_write32(0x1, 0x280);
> +	do {
> +		for (i = 0; i < (cdesc->ways * 3); i++) {
> +			for (j = 0; j < (cdesc->sets); j++) {
> +				*(volatile u32 *)addr;
> +				addr += cdesc->linesz;
> +			}
> +		}
> +		addr += 0x100000000000;
> +	} while (--nr_nodes > 0);
> +}
> +
>   asmlinkage __visible void __flush_cache_all(void)
>   {
>   	int leaf;
> @@ -71,7 +92,7 @@ asmlinkage __visible void __flush_cache_all(void)
>   
>   	leaf = cache_present - 1;
>   	if (cache_inclusive(cdesc + leaf)) {
> -		flush_cache_leaf(leaf);
> +		flush_cache_last_level(leaf);
>   		return;
>   	}
>