[3/7] powerpc/64s: use alternative feature patching

Message ID 20170320060152.1016-4-npiggin@gmail.com
State Superseded
Headers show

Commit Message

Nicholas Piggin March 20, 2017, 6:01 a.m.
This reduces the number of nops for POWER8

Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/kernel/idle_book3s.S | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

Patch

diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S
index 9f21f84ae49a..819e64104469 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