[PATCH] LoongArch: Update the flush cache policy

From: Li Jun
Date: Mon May 06 2024 - 05:24:38 EST


fix when LoongArch s3 resume, Can't find image information

Signed-off-by: Li Jun <lijun01@xxxxxxxxxx>
Signed-off-by: Baoqi Zhang <zhangbaoqi@xxxxxxxxxxx>
Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
Signed-off-by: Biao Dong <dongbiao@xxxxxxxxxxx>
---
arch/loongarch/mm/cache.c | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)

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)
} 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_write32(0x1, 0x280);
+ way_size = cdesc->sets * cdesc->linesz;
+ 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 +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;
}

--
2.34.1