From: "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com>
To: mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org, paulus@ozlabs.org,
linux-kernel@vger.kernel.org, mikey@neuling.org,
"Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com>
Subject: [PATCH v2 2/9] powerpc/kvm: make hypervisor state restore a function
Date: Tue, 3 May 2016 13:54:31 +0530 [thread overview]
Message-ID: <1462263878-25237-3-git-send-email-shreyas@linux.vnet.ibm.com> (raw)
In-Reply-To: <1462263878-25237-1-git-send-email-shreyas@linux.vnet.ibm.com>
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@linux.vnet.ibm.com>
---
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 7716ceb..7ebfbb0 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 6b3404b..82d164b 100644
--- a/arch/powerpc/kernel/idle_power7.S
+++ b/arch/powerpc/kernel/idle_power7.S
@@ -258,6 +258,35 @@ _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)
@@ -266,11 +295,13 @@ _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
@@ -420,33 +451,9 @@ 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
--
2.4.11
next prev parent reply other threads:[~2016-05-03 8:25 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-03 8:24 [PATCH v2 0/9] powerpc/powernv/cpuidle: Add support for POWER ISA v3 idle states Shreyas B. Prabhu
2016-05-03 8:24 ` [PATCH v2 1/9] powerpc/powernv: Move CHECK_HMI_INTERRUPT to exception-64s header Shreyas B. Prabhu
2016-05-18 4:35 ` Gautham R Shenoy
2016-05-18 7:21 ` Shreyas B Prabhu
2016-05-03 8:24 ` Shreyas B. Prabhu [this message]
2016-05-18 6:25 ` [PATCH v2 2/9] powerpc/kvm: make hypervisor state restore a function Gautham R Shenoy
2016-05-18 7:07 ` Shreyas B Prabhu
2016-05-19 14:24 ` Gautham R Shenoy
2016-05-20 1:45 ` Paul Mackerras
2016-05-03 8:24 ` [PATCH v2 3/9] powerpc/powernv: Move idle code usable by multiple hardware to common location Shreyas B. Prabhu
2016-05-18 6:29 ` Gautham R Shenoy
2016-05-03 8:24 ` [PATCH v2 4/9] powerpc/powernv: Make power7_powersave_common more generic Shreyas B. Prabhu
2016-05-18 6:37 ` Gautham R Shenoy
2016-05-18 6:51 ` Shreyas B Prabhu
2016-05-19 14:26 ` Gautham R Shenoy
2016-05-03 8:24 ` [PATCH v2 5/9] powerpc/powernv: Move idle related macros to cpuidle.h Shreyas B. Prabhu
2016-05-19 14:27 ` Gautham R Shenoy
2016-05-03 8:24 ` [PATCH v2 6/9] powerpc/powernv: set power_save func after the idle states are initialized Shreyas B. Prabhu
2016-05-18 6:45 ` Gautham R Shenoy
2016-05-03 8:24 ` [PATCH v2 7/9] powerpc/powernv: Add platform support for stop instruction Shreyas B. Prabhu
2016-05-18 17:57 ` Gautham R Shenoy
2016-05-20 5:25 ` Paul Mackerras
2016-05-20 6:16 ` Shreyas B Prabhu
2016-05-03 8:24 ` [PATCH v2 8/9] cpuidle/powernv: Add support for POWER ISA v3 idle states Shreyas B. Prabhu
2016-05-03 8:24 ` [PATCH v2 9/9] powerpc/powernv: Use deepest stop state when cpu is offlined Shreyas B. Prabhu
2016-05-18 18:07 ` Gautham R Shenoy
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1462263878-25237-3-git-send-email-shreyas@linux.vnet.ibm.com \
--to=shreyas@linux.vnet.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mikey@neuling.org \
--cc=mpe@ellerman.id.au \
--cc=paulus@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).