[PATCH v2 0/2] Fix cpuidle on qcom's THUMB2 kernels

[PATCH v2 0/2] Fix cpuidle on qcom's THUMB2 kernels

[Stephen Boyd]

I split this patch into two now that we have the cpu_resume_arm()
wrapper. The first patch could go through rmk's tree and then be
provided at some stable branch so that the second patch could go
through arm-soc. Or the two patches could go through arm-soc and
be squashed into one patch or stay split out. Either way, we have a
cross maintainer dependency here that needs to be resolved.

Changes from v1:
 * Add cpu_resume_arm() wrapper
 * New patch to fix up spm code to use new wrapper

Stephen Boyd (2):
  ARM: Add cpu_resume_arm() for firmwares that resume in ARM state
  soc: qcom: spm: Fix idle on THUMB2 kernels

 arch/arm/include/asm/suspend.h | 1 +
 arch/arm/kernel/sleep.S        | 7 +++++++
 drivers/soc/qcom/spm.c         | 2 +-
 3 files changed, 9 insertions(+), 1 deletion(-)

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[PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Stephen Boyd]

Some platforms always enter the kernel in the ARM state even if
the kernel is compiled for THUMB2. Add a small wrapper on top of
cpu_resume() that switches into THUMB2 state.

This fixes a problem reported by Kevin Hilman on next-20150601
where the ifc6410 fails to boot a THUMB2 kernel because the
platform's firmware always enters the kernel in ARM mode from
deep idle states.

Reported-by: Kevin Hilman <khilman@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Lina Iyer <lina.iyer@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
 arch/arm/include/asm/suspend.h | 1 +
 arch/arm/kernel/sleep.S        | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm/include/asm/suspend.h b/arch/arm/include/asm/suspend.h
index cd20029bcd94..6c7182f32cef 100644
--- a/arch/arm/include/asm/suspend.h
+++ b/arch/arm/include/asm/suspend.h
@@ -7,6 +7,7 @@ struct sleep_save_sp {
 };
 
 extern void cpu_resume(void);
+extern void cpu_resume_arm(void);
 extern int cpu_suspend(unsigned long, int (*)(unsigned long));
 
 #endif
diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
index 76bb3128e135..f37593567ef5 100644
--- a/arch/arm/kernel/sleep.S
+++ b/arch/arm/kernel/sleep.S
@@ -118,6 +118,12 @@ ENDPROC(cpu_resume_after_mmu)
 
 	.text
 	.align
+	.arm
+ENTRY(cpu_resume_arm)
+ THUMB(	badr	r9, 1f		)	@ Kernel is entered in ARM.
+ THUMB(	bx	r9		)	@ If this is a Thumb-2 kernel,
+ THUMB(	.thumb			)	@ switch to Thumb now.
+ THUMB(1:			)
 ENTRY(cpu_resume)
 ARM_BE8(setend be)			@ ensure we are in BE mode
 #ifdef CONFIG_ARM_VIRT_EXT
@@ -149,6 +155,7 @@ THUMB(	ldmia	r0!, {r1, r2, r3}	)
 THUMB(	mov	sp, r2			)
 THUMB(	bx	r3			)
 ENDPROC(cpu_resume)
+ENDPROC(cpu_resume_arm)
 
 	.align 2
 _sleep_save_sp:
-- 
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[PATCH v2 2/2] soc: qcom: spm: Fix idle on THUMB2 kernels

[Stephen Boyd]

The ifc6410 firmware always enters the kernel in ARM state from
deep idle. Use the cpu_resume_arm() wrapper instead of
cpu_resume() to property switch into the THUMB2 state when we
wake up from idle.

This fixes a problem reported by Kevin Hilman on next-20150601
where the ifc6410 fails to boot a THUMB2 kernel because the
platform's firmware always enters the kernel in ARM mode from
deep idle states.

Reported-by: Kevin Hilman <khilman@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Lina Iyer <lina.iyer@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
 drivers/soc/qcom/spm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/spm.c b/drivers/soc/qcom/spm.c
index b562af816c0a..b04b05a0904e 100644
--- a/drivers/soc/qcom/spm.c
+++ b/drivers/soc/qcom/spm.c
@@ -260,7 +260,7 @@ static int __init qcom_cpuidle_init(struct device_node *cpu_node, int cpu)
 		/* We have atleast one power down mode */
 		cpumask_clear(&mask);
 		cpumask_set_cpu(cpu, &mask);
-		qcom_scm_set_warm_boot_addr(cpu_resume, &mask);
+		qcom_scm_set_warm_boot_addr(cpu_resume_arm, &mask);
 	}
 
 	per_cpu(qcom_idle_ops, cpu) = fns;
-- 
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a Linux Foundation Collaborative Project

Re: [PATCH v2 0/2] Fix cpuidle on qcom's THUMB2 kernels

[Kevin Hilman]

Stephen Boyd <sboyd@codeaurora.org> writes:

> I split this patch into two now that we have the cpu_resume_arm()
> wrapper. The first patch could go through rmk's tree and then be
> provided at some stable branch so that the second patch could go
> through arm-soc. Or the two patches could go through arm-soc and
> be squashed into one patch or stay split out. Either way, we have a
> cross maintainer dependency here that needs to be resolved.

Tested-by: Kevin Hilman <khilman@linaro.org>

Boot tested on top of next-20150602 using multi_v7_defconfig +
CONFIG_THUMB2_KERNEL=y on a handful of qcom 8x[678]4 platforms[1] 

These platforms were all failing to boot this config with plain
next-20150602[2] and are all booting fine with this series.

Kevin

[1]
qcom-apq8064-ifc6410
qcom-apq8064-cm-qs600
qcom-apq8074-dragonboard
qcom-msm8974-sony-xperia-honami
qcom-apq8084-ifc6540

[2] http://kernelci.org/boot/all/job/next/kernel/next-20150602/

Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Russell King - ARM Linux]

On Tue, Jun 02, 2015 at 12:12:57PM -0700, Stephen Boyd wrote:
> Some platforms always enter the kernel in the ARM state even if
> the kernel is compiled for THUMB2. Add a small wrapper on top of
> cpu_resume() that switches into THUMB2 state.
> 
> This fixes a problem reported by Kevin Hilman on next-20150601
> where the ifc6410 fails to boot a THUMB2 kernel because the
> platform's firmware always enters the kernel in ARM mode from
> deep idle states.

I think this bit of the commit message isn't quite correct: this will
only resolve the boot problem with a T2 kernel when the failing platform
is converted to use the cpu_resume_arm() entry point.

Apart from that, the patch looks good to me, thanks.

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Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Stephen Boyd]

On 06/03, Russell King - ARM Linux wrote:
> On Tue, Jun 02, 2015 at 12:12:57PM -0700, Stephen Boyd wrote:
> > Some platforms always enter the kernel in the ARM state even if
> > the kernel is compiled for THUMB2. Add a small wrapper on top of
> > cpu_resume() that switches into THUMB2 state.
> > 
> > This fixes a problem reported by Kevin Hilman on next-20150601
> > where the ifc6410 fails to boot a THUMB2 kernel because the
> > platform's firmware always enters the kernel in ARM mode from
> > deep idle states.
> 
> I think this bit of the commit message isn't quite correct: this will
> only resolve the boot problem with a T2 kernel when the failing platform
> is converted to use the cpu_resume_arm() entry point.
> 
> Apart from that, the patch looks good to me, thanks.

Sure, it could say "This provides the functionality to fix a problem
reported by..."

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Re: [PATCH v2 2/2] soc: qcom: spm: Fix idle on THUMB2 kernels

[Lina Iyer]

On Tue, Jun 02 2015 at 13:13 -0600, Stephen Boyd wrote:
>The ifc6410 firmware always enters the kernel in ARM state from
>deep idle. Use the cpu_resume_arm() wrapper instead of
>cpu_resume() to property switch into the THUMB2 state when we
>wake up from idle.
>
>This fixes a problem reported by Kevin Hilman on next-20150601
>where the ifc6410 fails to boot a THUMB2 kernel because the
>platform's firmware always enters the kernel in ARM mode from
>deep idle states.
>
>Reported-by: Kevin Hilman <khilman@linaro.org>
>Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>Cc: Lina Iyer <lina.iyer@linaro.org>
>Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Reviewd-by: Lina Iyer <lina.iyer@linaro.org>

>---
> drivers/soc/qcom/spm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/soc/qcom/spm.c b/drivers/soc/qcom/spm.c
>index b562af816c0a..b04b05a0904e 100644
>--- a/drivers/soc/qcom/spm.c
>+++ b/drivers/soc/qcom/spm.c
>@@ -260,7 +260,7 @@ static int __init qcom_cpuidle_init(struct device_node *cpu_node, int cpu)
> 		/* We have atleast one power down mode */
> 		cpumask_clear(&mask);
> 		cpumask_set_cpu(cpu, &mask);
>-		qcom_scm_set_warm_boot_addr(cpu_resume, &mask);
>+		qcom_scm_set_warm_boot_addr(cpu_resume_arm, &mask);
> 	}
>
> 	per_cpu(qcom_idle_ops, cpu) = fns;
>-- 
>The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>a Linux Foundation Collaborative Project
>

Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Kevin Hilman]

Stephen Boyd <sboyd@codeaurora.org> writes:

> On 06/03, Russell King - ARM Linux wrote:
>> On Tue, Jun 02, 2015 at 12:12:57PM -0700, Stephen Boyd wrote:
>> > Some platforms always enter the kernel in the ARM state even if
>> > the kernel is compiled for THUMB2. Add a small wrapper on top of
>> > cpu_resume() that switches into THUMB2 state.
>> > 
>> > This fixes a problem reported by Kevin Hilman on next-20150601
>> > where the ifc6410 fails to boot a THUMB2 kernel because the
>> > platform's firmware always enters the kernel in ARM mode from
>> > deep idle states.
>> 
>> I think this bit of the commit message isn't quite correct: this will
>> only resolve the boot problem with a T2 kernel when the failing platform
>> is converted to use the cpu_resume_arm() entry point.
>> 
>> Apart from that, the patch looks good to me, thanks.
>
> Sure, it could say "This provides the functionality to fix a problem
> reported by..."

Stephen, are you planning to submit this through Russell's patch
tracker?  or...

Russell, should we take this through arm-soc along with PATCH 2/2 which
depends on this one?

Kevin

Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Stephen Boyd]

On 06/08/2015 02:33 PM, Kevin Hilman wrote:
> Stephen Boyd <sboyd@codeaurora.org> writes:
>
>> On 06/03, Russell King - ARM Linux wrote:
>>> On Tue, Jun 02, 2015 at 12:12:57PM -0700, Stephen Boyd wrote:
>>>> Some platforms always enter the kernel in the ARM state even if
>>>> the kernel is compiled for THUMB2. Add a small wrapper on top of
>>>> cpu_resume() that switches into THUMB2 state.
>>>>
>>>> This fixes a problem reported by Kevin Hilman on next-20150601
>>>> where the ifc6410 fails to boot a THUMB2 kernel because the
>>>> platform's firmware always enters the kernel in ARM mode from
>>>> deep idle states.
>>> I think this bit of the commit message isn't quite correct: this will
>>> only resolve the boot problem with a T2 kernel when the failing platform
>>> is converted to use the cpu_resume_arm() entry point.
>>>
>>> Apart from that, the patch looks good to me, thanks.
>> Sure, it could say "This provides the functionality to fix a problem
>> reported by..."
> Stephen, are you planning to submit this through Russell's patch
> tracker?  or...
>
> Russell, should we take this through arm-soc along with PATCH 2/2 which
> depends on this one?
>

I'm happy to see it be applied by arm-soc maintainers directly given
that Russell said "the patch looks good to me". The commit text needs a
slight reword here though, so I can resubmit the patches to arm-soc if
you like.

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Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Kevin Hilman]

Stephen Boyd <sboyd@codeaurora.org> writes:

> On 06/08/2015 02:33 PM, Kevin Hilman wrote:
>> Stephen Boyd <sboyd@codeaurora.org> writes:
>>
>>> On 06/03, Russell King - ARM Linux wrote:
>>>> On Tue, Jun 02, 2015 at 12:12:57PM -0700, Stephen Boyd wrote:
>>>>> Some platforms always enter the kernel in the ARM state even if
>>>>> the kernel is compiled for THUMB2. Add a small wrapper on top of
>>>>> cpu_resume() that switches into THUMB2 state.
>>>>>
>>>>> This fixes a problem reported by Kevin Hilman on next-20150601
>>>>> where the ifc6410 fails to boot a THUMB2 kernel because the
>>>>> platform's firmware always enters the kernel in ARM mode from
>>>>> deep idle states.
>>>> I think this bit of the commit message isn't quite correct: this will
>>>> only resolve the boot problem with a T2 kernel when the failing platform
>>>> is converted to use the cpu_resume_arm() entry point.
>>>>
>>>> Apart from that, the patch looks good to me, thanks.
>>> Sure, it could say "This provides the functionality to fix a problem
>>> reported by..."
>> Stephen, are you planning to submit this through Russell's patch
>> tracker?  or...
>>
>> Russell, should we take this through arm-soc along with PATCH 2/2 which
>> depends on this one?
>>
>
> I'm happy to see it be applied by arm-soc maintainers directly given
> that Russell said "the patch looks good to me". The commit text needs a
> slight reword here though, so I can resubmit the patches to arm-soc if
> you like.

Go ahead and respin/resubmit, and I can get them ready, but I'll wait
for an official word or acked-by from Russell before taking them both
through arm-soc.

Kevin

Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Russell King - ARM Linux]

On Mon, Jun 08, 2015 at 03:03:04PM -0700, Kevin Hilman wrote:
> Stephen Boyd <sboyd@codeaurora.org> writes:
> > I'm happy to see it be applied by arm-soc maintainers directly given
> > that Russell said "the patch looks good to me". The commit text needs a
> > slight reword here though, so I can resubmit the patches to arm-soc if
> > you like.
> 
> Go ahead and respin/resubmit, and I can get them ready, but I'll wait
> for an official word or acked-by from Russell before taking them both
> through arm-soc.

I've suggested to Kevin that, as I have another patch outstanding for
arm-soc, that I take this one into that same branch and send Kevin a
pull for both patches.  (Esp. as I don't like sending single-patch
pull requests.  Having two patches solves my dilema!)

Stephen, if you can arrange for the patch to end up in the patch system
please...

Thanks.

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Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Stephen Boyd]

On 06/09/2015 08:29 AM, Russell King - ARM Linux wrote:
>
> Stephen, if you can arrange for the patch to end up in the patch system
> please...
>

Sure no problem. The patch is 8389/1 in the tracker. I also fixed the
commit text.

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Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Uwe Kleine-König]

Hello,

On Tue, Jun 02, 2015 at 12:12:57PM -0700, Stephen Boyd wrote:
> Some platforms always enter the kernel in the ARM state even if
> the kernel is compiled for THUMB2. Add a small wrapper on top of
> cpu_resume() that switches into THUMB2 state.
> 
> This fixes a problem reported by Kevin Hilman on next-20150601
> where the ifc6410 fails to boot a THUMB2 kernel because the
> platform's firmware always enters the kernel in ARM mode from
> deep idle states.
> 
> Reported-by: Kevin Hilman <khilman@linaro.org>
> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> Cc: Lina Iyer <lina.iyer@linaro.org>
> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

> diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
> index 76bb3128e135..f37593567ef5 100644
> --- a/arch/arm/kernel/sleep.S
> +++ b/arch/arm/kernel/sleep.S
> @@ -118,6 +118,12 @@ ENDPROC(cpu_resume_after_mmu)
>  
>  	.text
>  	.align
> +	.arm
> +ENTRY(cpu_resume_arm)
> + THUMB(	badr	r9, 1f		)	@ Kernel is entered in ARM.
> + THUMB(	bx	r9		)	@ If this is a Thumb-2 kernel,
> + THUMB(	.thumb			)	@ switch to Thumb now.
> + THUMB(1:			)
>  ENTRY(cpu_resume)
>  ARM_BE8(setend be)			@ ensure we are in BE mode
>  #ifdef CONFIG_ARM_VIRT_EXT
this patch is in next as 51ac91b7f6b11b0da55ac93885ee7b864865bcb1 and
breaks efm32_defconfig. The exact error message is:

  AS      arch/arm/kernel/sleep.o
arch/arm/kernel/sleep.S: Assembler messages:
arch/arm/kernel/sleep.S:121: Error: selected processor does not support ARM opcodes
arch/arm/kernel/sleep.S:123: Error: bad instruction `badr r9,1f'
arch/arm/kernel/sleep.S:124: Error: attempt to use an ARM instruction on a Thumb-only processor -- `bx r9'
scripts/Makefile.build:294: recipe for target 'arch/arm/kernel/sleep.o' failed
make[3]: *** [arch/arm/kernel/sleep.o] Error 1

Best regards
Uwe

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Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Russell King - ARM Linux]

On Mon, Jun 15, 2015 at 08:33:25AM +0200, Uwe Kleine-König wrote:
> Hello,
> > +	.arm
> > +ENTRY(cpu_resume_arm)
> > + THUMB(	badr	r9, 1f		)	@ Kernel is entered in ARM.
> > + THUMB(	bx	r9		)	@ If this is a Thumb-2 kernel,
> > + THUMB(	.thumb			)	@ switch to Thumb now.
> > + THUMB(1:			)
> >  ENTRY(cpu_resume)
> >  ARM_BE8(setend be)			@ ensure we are in BE mode
> >  #ifdef CONFIG_ARM_VIRT_EXT
> this patch is in next as 51ac91b7f6b11b0da55ac93885ee7b864865bcb1 and
> breaks efm32_defconfig. The exact error message is:
> 
>   AS      arch/arm/kernel/sleep.o
> arch/arm/kernel/sleep.S: Assembler messages:
> arch/arm/kernel/sleep.S:121: Error: selected processor does not support ARM opcodes
> arch/arm/kernel/sleep.S:123: Error: bad instruction `badr r9,1f'
> arch/arm/kernel/sleep.S:124: Error: attempt to use an ARM instruction on a Thumb-only processor -- `bx r9'
> scripts/Makefile.build:294: recipe for target 'arch/arm/kernel/sleep.o' failed
> make[3]: *** [arch/arm/kernel/sleep.o] Error 1

Don't get me wrong, the build testing which goes on is really great, but
there's now a problem with all this.

There needs to be coordination between the people doing the build tests
to ensure that we don't "tire out" those who read the emails with different
groups of people reporting the same problem days after it was first
discovered, and even worse, days after it's been fixed.

The worst thing to do is to report build regressions on Monday for a tree
which was created on Thursday - by the time Monday comes around, projects
such as the 0-day builder have had plenty of time to find them.

Remember, the linux-next tree which is published on Friday (Austrailian
time) is a result of git trees snapshotted around midnight on Thursday.

So, if you're going to build an old linux-next tree, before you report any
problems, please check whether other build systems have already reported
them.  If you've gone to the trouble of tracking down the commit which
caused it, and therefore the likely git tree, check whether a fix has
already been merged.  Or maybe wait until the post-weekend linux-next is
published...

(The problem you're referring to was fixed and pushed out on Friday -
which seems to be a regular thing that happens with problems you've
reported on Mondays...)

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Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

[Uwe Kleine-König]

Hello Russell,

On Mon, Jun 15, 2015 at 12:01:36PM +0100, Russell King - ARM Linux wrote:
> On Mon, Jun 15, 2015 at 08:33:25AM +0200, Uwe Kleine-König wrote:
> > Hello,
> > > +	.arm
> > > +ENTRY(cpu_resume_arm)
> > > + THUMB(	badr	r9, 1f		)	@ Kernel is entered in ARM.
> > > + THUMB(	bx	r9		)	@ If this is a Thumb-2 kernel,
> > > + THUMB(	.thumb			)	@ switch to Thumb now.
> > > + THUMB(1:			)
> > >  ENTRY(cpu_resume)
> > >  ARM_BE8(setend be)			@ ensure we are in BE mode
> > >  #ifdef CONFIG_ARM_VIRT_EXT
> > this patch is in next as 51ac91b7f6b11b0da55ac93885ee7b864865bcb1 and
> > breaks efm32_defconfig. The exact error message is:
> > 
> >   AS      arch/arm/kernel/sleep.o
> > arch/arm/kernel/sleep.S: Assembler messages:
> > arch/arm/kernel/sleep.S:121: Error: selected processor does not support ARM opcodes
> > arch/arm/kernel/sleep.S:123: Error: bad instruction `badr r9,1f'
> > arch/arm/kernel/sleep.S:124: Error: attempt to use an ARM instruction on a Thumb-only processor -- `bx r9'
> > scripts/Makefile.build:294: recipe for target 'arch/arm/kernel/sleep.o' failed
> > make[3]: *** [arch/arm/kernel/sleep.o] Error 1
> 
> Don't get me wrong, the build testing which goes on is really great, but
> there's now a problem with all this.
> 
> There needs to be coordination between the people doing the build tests
> to ensure that we don't "tire out" those who read the emails with different
> groups of people reporting the same problem days after it was first
> discovered, and even worse, days after it's been fixed.
> 
> The worst thing to do is to report build regressions on Monday for a tree
> which was created on Thursday - by the time Monday comes around, projects
> such as the 0-day builder have had plenty of time to find them.
> 
> Remember, the linux-next tree which is published on Friday (Austrailian
> time) is a result of git trees snapshotted around midnight on Thursday.
> 
> So, if you're going to build an old linux-next tree, before you report any
> problems, please check whether other build systems have already reported
> them.  If you've gone to the trouble of tracking down the commit which
> caused it, and therefore the likely git tree, check whether a fix has
> already been merged.  Or maybe wait until the post-weekend linux-next is
> published...
> 
> (The problem you're referring to was fixed and pushed out on Friday -
> which seems to be a regular thing that happens with problems you've
> reported on Mondays...)
I consulted Google (asking for the commit id) and checked the
linux-arm-kernel list for reports which usually works well enough.

But I understand your complaint, last time I introduced a build
regression I got two automatic reports and three times the same fix into
my mailbox. So I will try to be more careful in the future.

Best regards
Uwe

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Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |