From 0dfffb48cecd8f84c6e649baee9bacd9be925734 Mon Sep 17 00:00:00 2001 From: "Shreyas B. Prabhu" Date: Fri, 8 Jul 2016 11:50:48 +0530 Subject: [PATCH] powerpc/powernv: abstraction for saving SPRs before entering deep idle states Create a function for saving SPRs before entering deep idle states. This function can be reused for POWER9 deep idle states. Reviewed-by: Gautham R. Shenoy Signed-off-by: Shreyas B. Prabhu Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/idle_book3s.S | 54 ++++++++++++++++++------------- 1 file changed, 32 insertions(+), 22 deletions(-) diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S index a8397e398817..2f909a12c76c 100644 --- a/arch/powerpc/kernel/idle_book3s.S +++ b/arch/powerpc/kernel/idle_book3s.S @@ -52,6 +52,36 @@ .text +/* + * Used by threads before entering deep idle states. Saves SPRs + * in interrupt stack frame + */ +save_sprs_to_stack: + /* + * Note all register i.e per-core, per-subcore or per-thread is saved + * here since any thread in the core might wake up first + */ + mfspr r3,SPRN_SDR1 + std r3,_SDR1(r1) + mfspr r3,SPRN_RPR + std r3,_RPR(r1) + mfspr r3,SPRN_SPURR + std r3,_SPURR(r1) + mfspr r3,SPRN_PURR + std r3,_PURR(r1) + mfspr r3,SPRN_TSCR + std r3,_TSCR(r1) + mfspr r3,SPRN_DSCR + std r3,_DSCR(r1) + mfspr r3,SPRN_AMOR + std r3,_AMOR(r1) + mfspr r3,SPRN_WORT + std r3,_WORT(r1) + mfspr r3,SPRN_WORC + std r3,_WORC(r1) + + blr + /* * Used by threads when the lock bit of core_idle_state is set. * Threads will spin in HMT_LOW until the lock bit is cleared. @@ -209,28 +239,8 @@ fastsleep_workaround_at_entry: b common_enter enter_winkle: - /* - * Note all register i.e per-core, per-subcore or per-thread is saved - * here since any thread in the core might wake up first - */ - mfspr r3,SPRN_SDR1 - std r3,_SDR1(r1) - mfspr r3,SPRN_RPR - std r3,_RPR(r1) - mfspr r3,SPRN_SPURR - std r3,_SPURR(r1) - mfspr r3,SPRN_PURR - std r3,_PURR(r1) - mfspr r3,SPRN_TSCR - std r3,_TSCR(r1) - mfspr r3,SPRN_DSCR - std r3,_DSCR(r1) - mfspr r3,SPRN_AMOR - std r3,_AMOR(r1) - mfspr r3,SPRN_WORT - std r3,_WORT(r1) - mfspr r3,SPRN_WORC - std r3,_WORC(r1) + bl save_sprs_to_stack + IDLE_STATE_ENTER_SEQ(PPC_WINKLE) _GLOBAL(power7_idle) -- GitLab