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Message-ID: <8a8135eb0f1dc724cfbb4402dc6daf08db5b0bc7.camel@xry111.site>
Subject: Re: [PATCH] LoongArch: Update the flush cache policy
From: Xi Ruoyao <xry111@xry111.site>
To: Li Jun <lijun01@kylinos.cn>, chenhuacai@kernel.org, kernel@xen0n.name, 
	lvjianmin@loongson.cn, dongbiao@loongson.cn, zhangbaoqi@loongson.cn
Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org
Date: Mon, 06 May 2024 17:28:58 +0800
In-Reply-To: <20240506092419.4109941-1-lijun01@kylinos.cn>
References: <20240506092419.4109941-1-lijun01@kylinos.cn>
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On Mon, 2024-05-06 at 17:24 +0800, Li Jun wrote:
> fix when LoongArch s3 resume, Can't find image information
>=20
> Signed-off-by: Li Jun <lijun01@kylinos.cn>
> Signed-off-by: Baoqi Zhang <zhangbaoqi@loongson.cn>
> Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
> Signed-off-by: Biao Dong <dongbiao@loongson.cn>
> ---
> =C2=A0arch/loongarch/mm/cache.c | 24 +++++++++++++++++++++++-
> =C2=A01 file changed, 23 insertions(+), 1 deletion(-)
>=20
> diff --git a/arch/loongarch/mm/cache.c b/arch/loongarch/mm/cache.c
> index 6be04d36ca07..52872fa0e5d8 100644
> --- a/arch/loongarch/mm/cache.c
> +++ b/arch/loongarch/mm/cache.c
> @@ -63,6 +63,28 @@ static void flush_cache_leaf(unsigned int leaf)
> =C2=A0	} while (--nr_nodes > 0);
> =C2=A0}
> =C2=A0
> +static void flush_cache_last_level(unsigned int leaf)
> +{
> +	u64 addr;
> +	int i, j, nr_nodes, way_size;
> +	struct cache_desc *cdesc =3D current_cpu_data.cache_leaves +
> leaf;
> +
> +	nr_nodes =3D loongson_sysconf.nr_nodes;
> +
> +	addr =3D CSR_DMW1_BASE;
> +	iocsr_write32(0x1, 0x280);
> +	way_size =3D cdesc->sets * cdesc->linesz;
> +	do {
> +		for (i =3D 0; i < (cdesc->ways * 3); i++) {
> +			for (j =3D 0; j < (cdesc->sets); j++) {
> +				*(volatile u32 *)addr;

??? what does this line do?

--=20
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University