Commit 7bd845b1 authored by Zhao Qunqin's avatar Zhao Qunqin Committed by Hongchen Zhang
Browse files

LoongArch: Update the flush cache policy 

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IBQ4JL


CVE: NA

--------------------------------

Otherwise, it may cause S3 wake-up failure in Loongson
3A6000 laptop.

Signed-off-by: default avatarZhao Qunqin <zhaoqunqin@loongson.cn>
Change-Id: I91684a1f58792480e9a71612ad8c522ae909e19c
parent 305d3014

arch/loongarch/mm/cache.c

+23 −1
Original line number Diff line number Diff line
@@ -63,6 +63,28 @@ 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, way_size;

	struct cache_desc *cdesc = current_cpu_data.cache_leaves + leaf;



	nr_nodes = loongson_sysconf.nr_nodes;



	addr = CSR_DMW1_BASE;

	iocsr_write8(0x1, 0x280);

	way_size = cdesc->sets * cdesc->linesz;

	do {

		for (i = 0; i < (cdesc->ways * 3); i++) {

			for (j = 0; j < (cdesc->sets); j++) {

				READ_ONCE(*(u32 *)addr);

				addr += cdesc->linesz;

			}

		}

		addr += 0x100000000000;

	} while (--nr_nodes > 0);

}



asmlinkage __visible void __flush_cache_all(void)

{

	int leaf;
@@ -71,7 +93,7 @@ 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;

	}