kernel.git/arch/loongarch/kernel/kdebugfs.c, branch linux-6.15.yHosts the 0x221E linux distro kernel.
https://git.0xinfinity.dev/distro/kernel.git/atom?h=linux-6.15.y2025-01-26T13:49:59ZLoongArch: Add debugfs entries to switch SFB/TSO state2025-01-26T13:49:59ZHuacai Chen2025-01-26T13:49:59Zurn:sha1:04816c1507b46baccd17a4bc948440b3634d5d13
We need to switch SFB (Store Fill Buffer) and TSO (Total Store Order)
state at runtime to debug memory management and KVM virtualization, so
add two debugfs entries "sfb_state" and "tso_state" under the directory
/sys/kernel/debug/loongarch.
Query SFB:
cat /sys/kernel/debug/loongarch/sfb_state
Enable SFB:
echo 1 > /sys/kernel/debug/loongarch/sfb_state
Disable SFB:
echo 0 > /sys/kernel/debug/loongarch/sfb_state
Query TSO:
cat /sys/kernel/debug/loongarch/tso_state
Switch TSO:
echo [TSO] > /sys/kernel/debug/loongarch/tso_state
Available [TSO] states:
0 (No Load No Store) 1 (All Load No Store) 3 (Same Load No Store)
4 (No Load All Store) 5 (All Load All Store) 7 (Same Load All Store)
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>