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Date: Sun, 22 Mar 2020 16:22:24 -0400
From: Sasha Levin <sashal@...nel.org>
To: 20200116141849.73955-1-r.czerwinski@...gutronix.de
Cc: Rouven Czerwinski <r.czerwinski@...gutronix.de>,
s.hauer@...gutronix.de, shawnguo@...nel.org,
Ahmad Fatoum <a.fatoum@...gutronix.de>,
linux-kernel@...r.kernel.org, linux-imx@....com,
kernel@...gutronix.de, festevam@...il.com,
linux-arm-kernel@...ts.infradead.org,
Lucas Stach <l.stach@...gutronix.de>, stable@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] ARM: imx: build v7_cpu_resume() unconditionally
On Sun, Mar 22, 2020 at 07:50:22PM +0100, Clemens Gruber wrote:
>Hi,
>
>On Thu, Jan 16, 2020 at 03:18:49PM +0100, Rouven Czerwinski wrote:
>> From: Ahmad Fatoum <a.fatoum@...gutronix.de>
>>
>> This function is not only needed by the platform suspend code, but is also
>> reused as the CPU resume function when the ARM cores can be powered down
>> completely in deep idle, which is the case on i.MX6SX and i.MX6UL(L).
>>
>> Providing the static inline stub whenever CONFIG_SUSPEND is disabled means
>> that those platforms will hang on resume from cpuidle if suspend is disabled.
>>
>> So there are two problems:
>>
>> - The static inline stub masks the linker error
>> - The function is not available where needed
>>
>> Fix both by just building the function unconditionally, when
>> CONFIG_SOC_IMX6 is enabled. The actual code is three instructions long,
>> so it's arguably ok to just leave it in for all i.MX6 kernel configurations.
>>
>> Fixes: 05136f0897b5 ("ARM: imx: support arm power off in cpuidle for i.mx6sx")
>> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
>> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
>> Signed-off-by: Rouven Czerwinski <r.czerwinski@...gutronix.de>
>> ---
>> arch/arm/mach-imx/Makefile | 2 ++
>> arch/arm/mach-imx/common.h | 4 ++--
>> arch/arm/mach-imx/resume-imx6.S | 24 ++++++++++++++++++++++++
>> arch/arm/mach-imx/suspend-imx6.S | 14 --------------
>> 4 files changed, 28 insertions(+), 16 deletions(-)
>> create mode 100644 arch/arm/mach-imx/resume-imx6.S
>>
>> diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
>> index 35ff620537e6..03506ce46149 100644
>> --- a/arch/arm/mach-imx/Makefile
>> +++ b/arch/arm/mach-imx/Makefile
>> @@ -91,6 +91,8 @@ AFLAGS_suspend-imx6.o :=-Wa,-march=armv7-a
>> obj-$(CONFIG_SOC_IMX6) += suspend-imx6.o
>> obj-$(CONFIG_SOC_IMX53) += suspend-imx53.o
>> endif
>> +AFLAGS_resume-imx6.o :=-Wa,-march=armv7-a
>> +obj-$(CONFIG_SOC_IMX6) += resume-imx6.o
>> obj-$(CONFIG_SOC_IMX6) += pm-imx6.o
>>
>> obj-$(CONFIG_SOC_IMX1) += mach-imx1.o
>> diff --git a/arch/arm/mach-imx/common.h b/arch/arm/mach-imx/common.h
>> index 912aeceb4ff8..5aa5796cff0e 100644
>> --- a/arch/arm/mach-imx/common.h
>> +++ b/arch/arm/mach-imx/common.h
>> @@ -109,17 +109,17 @@ void imx_cpu_die(unsigned int cpu);
>> int imx_cpu_kill(unsigned int cpu);
>>
>> #ifdef CONFIG_SUSPEND
>> -void v7_cpu_resume(void);
>> void imx53_suspend(void __iomem *ocram_vbase);
>> extern const u32 imx53_suspend_sz;
>> void imx6_suspend(void __iomem *ocram_vbase);
>> #else
>> -static inline void v7_cpu_resume(void) {}
>> static inline void imx53_suspend(void __iomem *ocram_vbase) {}
>> static const u32 imx53_suspend_sz;
>> static inline void imx6_suspend(void __iomem *ocram_vbase) {}
>> #endif
>>
>> +void v7_cpu_resume(void);
>> +
>> void imx6_pm_ccm_init(const char *ccm_compat);
>> void imx6q_pm_init(void);
>> void imx6dl_pm_init(void);
>> diff --git a/arch/arm/mach-imx/resume-imx6.S b/arch/arm/mach-imx/resume-imx6.S
>> new file mode 100644
>> index 000000000000..5bd1ba7ef15b
>> --- /dev/null
>> +++ b/arch/arm/mach-imx/resume-imx6.S
>> @@ -0,0 +1,24 @@
>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
>> +/*
>> + * Copyright 2014 Freescale Semiconductor, Inc.
>> + */
>> +
>> +#include <linux/linkage.h>
>> +#include <asm/assembler.h>
>> +#include <asm/asm-offsets.h>
>> +#include <asm/hardware/cache-l2x0.h>
>> +#include "hardware.h"
>> +
>> +/*
>> + * The following code must assume it is running from physical address
>> + * where absolute virtual addresses to the data section have to be
>> + * turned into relative ones.
>> + */
>> +
>> +ENTRY(v7_cpu_resume)
>> + bl v7_invalidate_l1
>> +#ifdef CONFIG_CACHE_L2X0
>> + bl l2c310_early_resume
>> +#endif
>> + b cpu_resume
>> +ENDPROC(v7_cpu_resume)
>> diff --git a/arch/arm/mach-imx/suspend-imx6.S b/arch/arm/mach-imx/suspend-imx6.S
>> index 062391ff13da..1eabf2d2834b 100644
>> --- a/arch/arm/mach-imx/suspend-imx6.S
>> +++ b/arch/arm/mach-imx/suspend-imx6.S
>> @@ -327,17 +327,3 @@ resume:
>>
>> ret lr
>> ENDPROC(imx6_suspend)
>> -
>> -/*
>> - * The following code must assume it is running from physical address
>> - * where absolute virtual addresses to the data section have to be
>> - * turned into relative ones.
>> - */
>> -
>> -ENTRY(v7_cpu_resume)
>> - bl v7_invalidate_l1
>> -#ifdef CONFIG_CACHE_L2X0
>> - bl l2c310_early_resume
>> -#endif
>> - b cpu_resume
>> -ENDPROC(v7_cpu_resume)
>> --
>> 2.25.0
>
>This patch broke the build for our i.MX6 kernel.
>
>I am referring to commits 512a928aff in mainline and
>7199cb65bb in linux-stable.
>
>In our kernel, neither CONFIG_PM nor CONFIG_SUSPEND are set. Therefore,
>ARM_CPU_SUSPEND is also unset, which means that sleep.S (containing
>cpu_resume) is not built.
>
>With this patch, ld reports the following error:
>arch/arm/mach-imx/resume-imx6.o: in function `v7_cpu_resume':
>(.text+0x8): undefined reference to `cpu_resume'
Is this a problem with Linus's tree as well?
--
Thanks,
Sasha
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