[PATCH 3/3] powerpc/powernv: Refactor hypervisor state restore code

[Shreyas B. Prabhu]

In the current code, when the thread wakes up in reset vector, some
of the state restore code and check for whether a thread needs to
branch to kvm is duplicated. Reorder the code such that this
duplication is avoided.

At a higher level this is what the change looks like-

Before this patch -
===================
power7_wakeup_tb_loss:
	restore hypervisor state
	if (thread needed by kvm)
		goto kvm_start_guest
	restore nvgprs, cr, pc
	rfid to process context

power7_wakeup_loss:
	restore nvgprs, cr, pc
	rfid to process context

reset vector:
	if (waking from deep idle states)
		goto power7_wakeup_tb_loss
	else
		if (thread needed by kvm)
			goto kvm_start_guest
		goto power7_wakeup_loss

After this patch -
==================
power7_wakeup_tb_loss:
	restore hypervisor state
	return

power7_restore_hyp_resource():
	if (waking from deep idle states)
		goto power7_wakeup_tb_loss
	return

power7_wakeup_loss:
	restore nvgprs, cr, pc
	rfid to process context

reset vector:
	power7_restore_hyp_resource()
	if (thread needed by kvm)
                goto kvm_start_guest
	goto power7_wakeup_loss

Signed-off-by: Shreyas B. Prabhu <shreyas@xxxxxxxxxxxxxxxxxx>
---
 arch/powerpc/kernel/exceptions-64s.S | 29 +++-------------
 arch/powerpc/kernel/idle_power7.S    | 67 ++++++++++++++++++++----------------
 2 files changed, 41 insertions(+), 55 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 7716cebf4b8e..7ebfbb0c9992 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -107,25 +107,8 @@ BEGIN_FTR_SECTION
 	beq	9f
 
 	cmpwi	cr3,r13,2
+	bl	power7_restore_hyp_resource
 
-	/*
-	 * Check if last bit of HSPGR0 is set. This indicates whether we are
-	 * waking up from winkle.
-	 */
-	GET_PACA(r13)
-	clrldi	r5,r13,63
-	clrrdi	r13,r13,1
-	cmpwi	cr4,r5,1
-	mtspr	SPRN_HSPRG0,r13
-
-	lbz	r0,PACA_THREAD_IDLE_STATE(r13)
-	cmpwi   cr2,r0,PNV_THREAD_NAP
-	bgt     cr2,8f				/* Either sleep or Winkle */
-
-	/* Waking up from nap should not cause hypervisor state loss */
-	bgt	cr3,.
-
-	/* Waking up from nap */
 	li	r0,PNV_THREAD_RUNNING
 	stb	r0,PACA_THREAD_IDLE_STATE(r13)	/* Clear thread state */
 
@@ -143,13 +126,9 @@ BEGIN_FTR_SECTION
 
 	/* Return SRR1 from power7_nap() */
 	mfspr	r3,SPRN_SRR1
-	beq	cr3,2f
-	b	power7_wakeup_noloss
-2:	b	power7_wakeup_loss
-
-	/* Fast Sleep wakeup on PowerNV */
-8:	GET_PACA(r13)
-	b 	power7_wakeup_tb_loss
+	blt	cr3,2f
+	b	power7_wakeup_loss
+2:	b	power7_wakeup_noloss
 
 9:
 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
diff --git a/arch/powerpc/kernel/idle_power7.S b/arch/powerpc/kernel/idle_power7.S
index 6af57e292848..0852685a22b8 100644
--- a/arch/powerpc/kernel/idle_power7.S
+++ b/arch/powerpc/kernel/idle_power7.S
@@ -197,6 +197,35 @@ _GLOBAL(power7_winkle)
 	b	power7_powersave_common
 	/* No return */
 
+/*
+ * Called from reset vector. Check whether we have woken up with
+ * hypervisor state loss. If yes, restore hypervisor state and return
+ * back to reset vector.
+ */
+_GLOBAL(power7_restore_hyp_resource)
+	/*
+	 * Check if last bit of HSPGR0 is set. This indicates whether we are
+	 * waking up from winkle.
+	 */
+	GET_PACA(r13)
+	clrldi	r5,r13,63
+	clrrdi	r13,r13,1
+	cmpwi	cr4,r5,1
+	mtspr	SPRN_HSPRG0,r13
+
+	lbz	r0,PACA_THREAD_IDLE_STATE(r13)
+	cmpwi   cr2,r0,PNV_THREAD_NAP
+	bgt     cr2,power7_wakeup_tb_loss	/* Either sleep or Winkle */
+
+	/*
+	 * We fall through here if PACA_THREAD_IDLE_STATE shows we are waking
+	 * up from nap. At this stage CR3 shouldn't contains 'gt' since that
+	 * indicates we are waking with hypervisor state loss from nap.
+	 */
+	bgt	cr3,.
+
+	blr
+
 _GLOBAL(power7_wakeup_tb_loss)
 	ld	r2,PACATOC(r13);
 	ld	r1,PACAR1(r13)
@@ -205,11 +234,13 @@ _GLOBAL(power7_wakeup_tb_loss)
 	 * and they are restored before switching to the process context. Hence
 	 * until they are restored, they are free to be used.
 	 *
-	 * Save SRR1 in a NVGPR as it might be clobbered in opal_call_realmode
-	 * (called in CHECK_HMI_INTERRUPT). SRR1 is required to determine the
-	 * wakeup reason if we branch to kvm_start_guest.
+	 * Save SRR1 and LR in NVGPRs as they might be clobbered in
+	 * opal_call_realmode (called in CHECK_HMI_INTERRUPT). SRR1 is required
+	 * to determine the wakeup reason if we branch to kvm_start_guest. LR
+	 * is required to return back to reset vector after hypervisor state
+	 * restore is complete.
 	 */
-
+	mflr	r17
 	mfspr	r16,SPRN_SRR1
 BEGIN_FTR_SECTION
 	CHECK_HMI_INTERRUPT
@@ -359,33 +390,9 @@ common_exit:
 
 hypervisor_state_restored:
 
-	li	r5,PNV_THREAD_RUNNING
-	stb     r5,PACA_THREAD_IDLE_STATE(r13)
-
 	mtspr	SPRN_SRR1,r16
-#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
-	li      r0,KVM_HWTHREAD_IN_KERNEL
-	stb     r0,HSTATE_HWTHREAD_STATE(r13)
-	/* Order setting hwthread_state vs. testing hwthread_req */
-	sync
-	lbz     r0,HSTATE_HWTHREAD_REQ(r13)
-	cmpwi   r0,0
-	beq     6f
-	b       kvm_start_guest
-6:
-#endif
-
-	REST_NVGPRS(r1)
-	REST_GPR(2, r1)
-	ld	r3,_CCR(r1)
-	ld	r4,_MSR(r1)
-	ld	r5,_NIP(r1)
-	addi	r1,r1,INT_FRAME_SIZE
-	mtcr	r3
-	mfspr	r3,SPRN_SRR1		/* Return SRR1 */
-	mtspr	SPRN_SRR1,r4
-	mtspr	SPRN_SRR0,r5
-	rfid
+	mtlr	r17
+	blr
 
 fastsleep_workaround_at_exit:
 	li	r3,1
-- 
1.9.3