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From: "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com>
To: mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org, paulus@ozlabs.org,
	linux-kernel@vger.kernel.org, mikey@neuling.org,
	ego@linux.vnet.ibm.com,
	"Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com>
Subject: [PATCH v3 5/9] powerpc/powernv: abstraction for saving SPRs before entering deep idle states
Date: Mon, 23 May 2016 20:48:38 +0530	[thread overview]
Message-ID: <1464016722-7488-6-git-send-email-shreyas@linux.vnet.ibm.com> (raw)
In-Reply-To: <1464016722-7488-1-git-send-email-shreyas@linux.vnet.ibm.com>

Create a function for saving SPRs before entering deep idle states.
This function can be reused for POWER9 deep idle states.

Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
---
New 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 d100577..d931537 100644
--- a/arch/powerpc/kernel/idle_power_common.S
+++ b/arch/powerpc/kernel/idle_power_common.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.
  * r14 - pointer to core_idle_state
@@ -207,28 +237,8 @@ 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

  parent reply	other threads:[~2016-05-23 15:19 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-23 15:18 [PATCH v3 0/9] powerpc/powernv/cpuidle: Add support for POWER ISA v3 idle states Shreyas B. Prabhu
2016-05-23 15:18 ` [PATCH v3 1/9] powerpc/kvm: make hypervisor state restore a function Shreyas B. Prabhu
2016-05-23 15:18 ` [PATCH v3 2/9] powerpc/powernv: Rename idle_power7.S to idle_power_common.S Shreyas B. Prabhu
2016-05-24  8:27   ` Gautham R Shenoy
2016-05-23 15:18 ` [PATCH v3 3/9] powerpc/powernv: Rename reusable idle functions to hardware agnostic names Shreyas B. Prabhu
2016-05-24  8:30   ` Gautham R Shenoy
2016-05-23 15:18 ` [PATCH v3 4/9] powerpc/powernv: Make power7_powersave_common more generic Shreyas B. Prabhu
2016-05-24  8:54   ` Gautham R Shenoy
2016-05-23 15:18 ` Shreyas B. Prabhu [this message]
2016-05-24  8:55   ` [PATCH v3 5/9] powerpc/powernv: abstraction for saving SPRs before entering deep idle states Gautham R Shenoy
2016-05-23 15:18 ` [PATCH v3 6/9] powerpc/powernv: set power_save func after the idle states are initialized Shreyas B. Prabhu
2016-05-23 15:18 ` [PATCH v3 7/9] powerpc/powernv: Add platform support for stop instruction Shreyas B. Prabhu
2016-05-24  8:47   ` Madhavan Srinivasan
2016-05-24 10:24   ` Gautham R Shenoy
2016-05-25  2:16     ` Shreyas B Prabhu
     [not found]   ` <886163be-b915-b60f-b25b-bf770f3ed821@linux.vnet.ibm.com>
2016-05-25  2:12     ` Shreyas B Prabhu
2016-05-23 15:18 ` [PATCH v3 8/9] cpuidle/powernv: Add support for POWER ISA v3 idle states Shreyas B. Prabhu
2016-05-24 10:37   ` Gautham R Shenoy
2016-05-23 15:18 ` [PATCH v3 9/9] powerpc/powernv: Use deepest stop state when cpu is offlined Shreyas B. Prabhu

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