linux-kernel - [PATCH v2 4/9] powerpc/powernv: Make power7_powersave

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Message-Id: <1462263878-25237-5-git-send-email-shreyas@linux.vnet.ibm.com>
Date:	Tue,  3 May 2016 13:54:33 +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,
	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>
Subject: [PATCH v2 4/9] powerpc/powernv: Make power7_powersave_common more generic

power7_powersave_common does common steps needed before entering idle
state and eventually changes MSR to MSR_IDLE and does rfid to
power7_enter_nap_mode.

Make it more generic by passing the rfid address as a function parameter.
Also make function name more generic.

Signed-off-by: Shreyas B. Prabhu <shreyas@...ux.vnet.ibm.com>
---
 arch/powerpc/kernel/idle_power7.S       | 11 +++++++----
 arch/powerpc/kernel/idle_power_common.S | 11 ++++++-----
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/kernel/idle_power7.S b/arch/powerpc/kernel/idle_power7.S
index 594e1c5..1ea71d4 100644
--- a/arch/powerpc/kernel/idle_power7.S
+++ b/arch/powerpc/kernel/idle_power7.S
@@ -169,19 +169,22 @@ _GLOBAL(power7_idle)
 _GLOBAL(power7_nap)
 	mr	r4,r3
 	li	r3,PNV_THREAD_NAP
-	b	power7_powersave_common
+	LOAD_REG_ADDR(r5, power7_enter_nap_mode)
+	b	power_powersave_common
 	/* No return */
 
 _GLOBAL(power7_sleep)
 	li	r3,PNV_THREAD_SLEEP
 	li	r4,1
-	b	power7_powersave_common
+	LOAD_REG_ADDR(r5, power7_enter_nap_mode)
+	b	power_powersave_common
 	/* No return */
 
 _GLOBAL(power7_winkle)
-	li	r3,3
+	li	r3,PNV_THREAD_WINKLE
 	li	r4,1
-	b	power7_powersave_common
+	LOAD_REG_ADDR(r5, power7_enter_nap_mode)
+	b	power_powersave_common
 	/* No return */
 
 _GLOBAL(power7_wakeup_tb_loss)
diff --git a/arch/powerpc/kernel/idle_power_common.S b/arch/powerpc/kernel/idle_power_common.S
index 05954ae..ff7a541 100644
--- a/arch/powerpc/kernel/idle_power_common.S
+++ b/arch/powerpc/kernel/idle_power_common.S
@@ -21,8 +21,10 @@
  * To check IRQ_HAPPENED in r4
  * 	0 - don't check
  * 	1 - check
+ *
+ * Address to 'rfid' to in r5
  */
-_GLOBAL(power7_powersave_common)
+_GLOBAL(power_powersave_common)
 	/* Use r3 to pass state nap/sleep/winkle */
 	/* NAP is a state loss, we create a regs frame on the
 	 * stack, fill it up with the state we care about and
@@ -79,13 +81,12 @@ _GLOBAL(power7_powersave_common)
 	 * because as soon as we do that, another thread can switch
 	 * the MMU context to the guest.
 	 */
-	LOAD_REG_IMMEDIATE(r5, MSR_IDLE)
+	LOAD_REG_IMMEDIATE(r7, MSR_IDLE)
 	li	r6, MSR_RI
 	andc	r6, r9, r6
-	LOAD_REG_ADDR(r7, power7_enter_nap_mode)
 	mtmsrd	r6, 1		/* clear RI before setting SRR0/1 */
-	mtspr	SPRN_SRR0, r7
-	mtspr	SPRN_SRR1, r5
+	mtspr	SPRN_SRR0, r5
+	mtspr	SPRN_SRR1, r7
 	rfid
 	/* No return */
 
-- 
2.4.11