diff mbox series

[RFC,6/9] powerpc/64s: save one more register in the masked interrupt handler

Message ID 20201106155929.2246055-7-npiggin@gmail.com (mailing list archive)
State RFC
Headers show
Series powerpc/64s: fast interrupt exit | expand

Checks

Context Check Description
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/merge (f924bf2a58108816db1c95e08af4b1f99c90afa3)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/next (3cea11cd5e3b00d91caf0b4730194039b45c5891)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linus/master (521b619acdc8f1f5acdac15b84f81fd9515b2aff)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/fixes (3fb4a8fa28b740709bdd3229b80279957f4d37ed)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linux-next (c34f157421f6905e6b4a79a312e9175dce2bc607)
snowpatch_ozlabs/apply_patch fail Failed to apply to any branch

Commit Message

Nicholas Piggin Nov. 6, 2020, 3:59 p.m. UTC 
This frees up one more register (and takes advantage of that to
clean things up a little bit).

This register will be used in the following patch.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/kernel/exceptions-64s.S | 34 ++++++++++++++++------------
 1 file changed, 20 insertions(+), 14 deletions(-)
diff mbox series

Patch

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index b370a5f334fc..a01f69e774b5 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -2745,7 +2745,6 @@  INT_DEFINE_END(soft_nmi)
  * and run it entirely with interrupts hard disabled.
  */
 EXC_COMMON_BEGIN(soft_nmi_common)
-	mfspr	r11,SPRN_SRR0
 	mr	r10,r1
 	ld	r1,PACAEMERGSP(r13)
 	subi	r1,r1,INT_FRAME_SIZE
@@ -2780,19 +2779,24 @@  masked_Hinterrupt:
 	.else
 masked_interrupt:
 	.endif
-	lbz	r11,PACAIRQHAPPENED(r13)
-	or	r11,r11,r10
-	stb	r11,PACAIRQHAPPENED(r13)
+	stw	r9,PACA_EXGEN+EX_CCR(r13)
+	lbz	r9,PACAIRQHAPPENED(r13)
+	or	r9,r9,r10
+	stb	r9,PACAIRQHAPPENED(r13)
+
+	.if ! \hsrr
 	cmpwi	r10,PACA_IRQ_DEC
 	bne	1f
-	lis	r10,0x7fff
-	ori	r10,r10,0xffff
-	mtspr	SPRN_DEC,r10
+	LOAD_REG_IMMEDIATE(r9, 0x7fffffff)
+	mtspr	SPRN_DEC,r9
 #ifdef CONFIG_PPC_WATCHDOG
+	lwz	r9,PACA_EXGEN+EX_CCR(r13)
 	b	soft_nmi_common
 #else
 	b	2f
 #endif
+	.endif
+
 1:	andi.	r10,r10,PACA_IRQ_MUST_HARD_MASK
 	beq	2f
 	xori	r12,r12,MSR_EE	/* clear MSR_EE */
@@ -2801,17 +2805,19 @@  masked_interrupt:
 	.else
 	mtspr	SPRN_SRR1,r12
 	.endif
-	ori	r11,r11,PACA_IRQ_HARD_DIS
-	stb	r11,PACAIRQHAPPENED(r13)
+	ori	r9,r9,PACA_IRQ_HARD_DIS
+	stb	r9,PACAIRQHAPPENED(r13)
 2:	/* done */
-	li	r10,0
+	li	r9,0
 	.if \hsrr
-	stb	r10,PACAHSRR_VALID(r13)
+	stb	r9,PACAHSRR_VALID(r13)
 	.else
-	stb	r10,PACASRR_VALID(r13)
+	stb	r9,PACASRR_VALID(r13)
 	.endif
-	ld	r10,PACA_EXGEN+EX_CTR(r13)
-	mtctr	r10
+
+	ld	r9,PACA_EXGEN+EX_CTR(r13)
+	mtctr	r9
+	lwz	r9,PACA_EXGEN+EX_CCR(r13)
 	mtcrf	0x80,r9
 	std	r1,PACAR1(r13)
 	ld	r9,PACA_EXGEN+EX_R9(r13)