From 1696d0fb7fcd18160c9cc92a3f2b2d68e6923dd8 Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Tue, 24 Oct 2017 21:44:44 +1000 Subject: powerpc/64: Set DSCR default initially from SPR Take the DSCR value set by firmware as the dscr_default value, rather than zero. POWER9 recommends DSCR default to a non-zero value. Signed-off-by: From: Nicholas Piggin [mpe: Make record_spr_defaults() __init] Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/sysfs.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'arch/powerpc/kernel/sysfs.c') diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c index 4437c70c7c2b..b8d4a1dac39f 100644 --- a/arch/powerpc/kernel/sysfs.c +++ b/arch/powerpc/kernel/sysfs.c @@ -590,6 +590,17 @@ static void sysfs_create_dscr_default(void) if (cpu_has_feature(CPU_FTR_DSCR)) err = device_create_file(cpu_subsys.dev_root, &dev_attr_dscr_default); } + +void __init record_spr_defaults(void) +{ + int cpu; + + if (cpu_has_feature(CPU_FTR_DSCR)) { + dscr_default = mfspr(SPRN_DSCR); + for (cpu = 0; cpu < nr_cpu_ids; cpu++) + paca[cpu].dscr_default = dscr_default; + } +} #endif /* CONFIG_PPC64 */ #ifdef HAS_PPC_PMC_PA6T -- cgit