Thread (24 messages) flat view 24 messages, 3 authors, 2017-03-20

Re: [PATCH 3/8] powerpc/64s: use alternative feature patching

From: Gautham R Shenoy <hidden>
Date: 2017-03-16 11:21:59

On Tue, Mar 14, 2017 at 07:23:44PM +1000, Nicholas Piggin wrote:
This reduces the number of nops for POWER8.
Nice!
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Gautham R. Shenoy <redacted>
quoted hunk ↗ jump to hunk
---
 arch/powerpc/kernel/idle_book3s.S | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S
index 405631b2c229..9284ea0762b1 100644
--- a/arch/powerpc/kernel/idle_book3s.S
+++ b/arch/powerpc/kernel/idle_book3s.S
@@ -383,7 +383,11 @@ _GLOBAL(power9_idle_stop)
  */
 .global pnv_powersave_wakeup
 pnv_powersave_wakeup:
-	bl	pnv_restore_hyp_resource
+BEGIN_FTR_SECTION
+	bl	pnv_restore_hyp_resource_arch300
+FTR_SECTION_ELSE
+	bl	pnv_restore_hyp_resource_arch207
+ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)

 	li	r0,PNV_THREAD_RUNNING
 	stb	r0,PACA_THREAD_IDLE_STATE(r13)	/* Clear thread state */
@@ -411,14 +415,13 @@ pnv_powersave_wakeup:
  *
  * cr3 - set to gt if waking up with partial/complete hypervisor state loss
  */
-pnv_restore_hyp_resource:
-	ld	r2,PACATOC(r13);
-
-BEGIN_FTR_SECTION
+pnv_restore_hyp_resource_arch300:
 	/*
 	 * POWER ISA 3. Use PSSCR to determine if we
 	 * are waking up from deep idle state
 	 */
+	ld	r2,PACATOC(r13);
+
 	LOAD_REG_ADDRBASE(r5,pnv_first_deep_stop_state)
 	ld	r4,ADDROFF(pnv_first_deep_stop_state)(r5)
@@ -433,12 +436,14 @@ BEGIN_FTR_SECTION

 	blr	/* Waking up without hypervisor state loss. */

-END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
-
+/* Same calling convention as arch300 */
+pnv_restore_hyp_resource_arch207:
 	/*
 	 * POWER ISA 2.07 or less.
 	 * Check if we slept with winkle.
 	 */
+	ld	r2,PACATOC(r13);
+
 	lbz	r0,PACA_THREAD_IDLE_STATE(r13)
 	cmpwi   cr2,r0,PNV_THREAD_NAP
 	cmpwi   cr4,r0,PNV_THREAD_WINKLE
-- 
2.11.0
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