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Message-Id: <1464095714-48772-7-git-send-email-shreyas@linux.vnet.ibm.com> Date: Tue, 24 May 2016 18:45:10 +0530 From: "Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com> To: mpe@...erman.id.au Cc: linuxppc-dev@...ts.ozlabs.org, paulus@...abs.org, linux-kernel@...r.kernel.org, mikey@...ling.org, ego@...ux.vnet.ibm.com, maddy@...ux.vnet.ibm.com, "Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com> Subject: [PATCH v4 06/10] 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 <ego@...ux.vnet.ibm.com> Signed-off-by: Shreyas B. Prabhu <shreyas@...ux.vnet.ibm.com> --- - No changes in v4 Changes in v3: ============= - Newly added in v3 arch/powerpc/kernel/idle_power_common.S | 54 +++++++++++++++++++-------------- 1 file changed, 32 insertions(+), 22 deletions(-) diff --git a/arch/powerpc/kernel/idle_power_common.S b/arch/powerpc/kernel/idle_power_common.S index a8397e3..2f909a1 100644 --- a/arch/powerpc/kernel/idle_power_common.S +++ b/arch/powerpc/kernel/idle_power_common.S @@ -53,6 +53,36 @@ .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. * r14 - pointer to core_idle_state @@ -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) -- 2.4.11
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