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| Started by | "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com> |
|---|---|
| First post | 2016-06-08 19:00 +0200 |
| Last post | 2016-06-08 19:00 +0200 |
| Articles | 1 — 1 participant |
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[PATCH v6 06/11] powerpc/powernv: abstraction for saving SPRs before entering deep idle states "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com> - 2016-06-08 19:00 +0200
| From | "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com> |
|---|---|
| Date | 2016-06-08 19:00 +0200 |
| Subject | [PATCH v6 06/11] powerpc/powernv: abstraction for saving SPRs before entering deep idle states |
| Message-ID | <rHOZI-2EF-29@gated-at.bofh.it> |
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@linux.vnet.ibm.com> Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> --- - No changes since v3 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) -- 2.1.4
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