Re: [PATCH v2] powernv: Handle wakeup from idle due to SRESET

From: "Gautham R. Shenoy" <redacted>

The existing code doesn't handle the case when CPU which was in a
hardware-idle state (nap,sleep,winkle on POWER8 and various stop
states on POWER9) gets woken up due to a System Reset interrupt.

This patch checks if the CPU was woken up due to System Reset, in
which case, after restoring the required hardware state, it jumps to
the system reset handler.

Signed-off-by: Gautham R. Shenoy <redacted>
---
v1 -> v2: Set r9,r11,r12 to CR,SRR0,SRR1 values
before jumping to system_reset_common as expected by
EXCEPTION_PROLOG_COMMON

 arch/powerpc/kernel/idle_book3s.S | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S
index 72dac0b..06afe0e 100644
--- a/arch/powerpc/kernel/idle_book3s.S
+++ b/arch/powerpc/kernel/idle_book3s.S

@@ -353,6 +353,22 @@ ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_ARCH_207S, 66);		\
 	ld	r3,ORIG_GPR3(r1);	/* Restore original r3 */	\
 20:	nop;
 
+#define CHECK_SRESET_INTERRUPT                                          \
+BEGIN_FTR_SECTION_NESTED(67);						\
+	mfspr	r0,SPRN_SRR1;						\
+	rlwinm	r0,r0,45-31,0xf; /* Extract wake reason field (P8,9) */ \
+	cmpwi	r0,0x4;		  /* System Reset ? 	*/		\
+	bne	21f;							\
+	ld	r1,PACAR1(r13);						\
+	ld	r9,_CCR(r1);						\
+	ld	r11,_NIP(r1);						\
+	mfspr	r12, SPRN_SRR1;						\
+	b	system_reset_common ;					\
+	b	.; 		/* We shouldn't return here */		\
+FTR_SECTION_ELSE_NESTED(67);						\
+	nop		   ;						\
+ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_ARCH_207S, 67); \