RE: [PATCH] iommu/arm-smmu: fix the module name for disable_bypass parameter

2020-02-11 Thread Leo Li 



> -Original Message-
> From: Russell King - ARM Linux admin 
> Sent: Tuesday, February 11, 2020 5:46 PM
> To: Leo Li 
> Cc: Joerg Roedel ; Will Deacon ;
> Robin Murphy ; iommu@lists.linux-
> foundation.org; linux-ker...@vger.kernel.org; linux-arm-
> ker...@lists.infradead.org
> Subject: Re: [PATCH] iommu/arm-smmu: fix the module name for
> disable_bypass parameter
> 
> On Tue, Feb 11, 2020 at 05:36:55PM -0600, Li Yang wrote:
> > Since commit cd221bd24ff5 ("iommu/arm-smmu: Allow building as a
> > module"), there is a side effect that the module name is changed from
> > arm-smmu to arm-smmu-mod.  So the kernel parameter for
> disable_bypass
> > need to be changed too.  Fix the Kconfig help and error message to the
> > correct parameter name.
> 
> Hmm, this seems to be a user-visible change - so those of us who have been
> booting with "arm-smmu.disable_bypass=0" now need to change that
> depending on which kernel is being booted - which is not nice, and makes
> the support side on platforms that need this kernel parameter harder.

I agree.  Probably a better fix is to update the Makefile to change the module 
name back to the original one.

Regards,
Leo

> 
> >
> > Signed-off-by: Li Yang 
> > ---
> >  drivers/iommu/Kconfig| 2 +-
> >  drivers/iommu/arm-smmu.c | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index
> > d2fade984999..fb54be903c60 100644
> > --- a/drivers/iommu/Kconfig
> > +++ b/drivers/iommu/Kconfig
> > @@ -415,7 +415,7 @@ config
> ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
> >   hardcode the bypass disable in the code.
> >
> >   NOTE: the kernel command line parameter
> > - 'arm-smmu.disable_bypass' will continue to override this
> > + 'arm-smmu-mod.disable_bypass' will continue to override this
> >   config.
> >
> >  config ARM_SMMU_V3
> > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index
> > 16c4b87af42b..2ffe8ff04393 100644
> > --- a/drivers/iommu/arm-smmu.c
> > +++ b/drivers/iommu/arm-smmu.c
> > @@ -512,7 +512,7 @@ static irqreturn_t arm_smmu_global_fault(int irq,
> void *dev)
> > if
> (IS_ENABLED(CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT) &&
> > (gfsr & ARM_SMMU_sGFSR_USF))
> > dev_err(smmu->dev,
> > -   "Blocked unknown Stream ID 0x%hx; boot
> with \"arm-smmu.disable_bypass=0\" to allow, but this may have security
> implications\n",
> > +   "Blocked unknown Stream ID 0x%hx; boot
> with
> > +\"arm-smmu-mod.disable_bypass=0\" to allow, but this may have
> > +security implications\n",
> > (u16)gfsynr1);
> > else
> > dev_err(smmu->dev,
> > --
> > 2.17.1
> >
> >
> > ___
> > linux-arm-kernel mailing list
> > linux-arm-ker...@lists.infradead.org
> > https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists
> > .infradead.org%2Fmailman%2Flistinfo%2Flinux-arm-
> kernel&data=02%7C0
> >
> 1%7Cleoyang.li%40nxp.com%7Cf2f7f3c7c8fa4df0fb0608d7af4c84d1%7C686ea
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> >
> 
> --
> RMK's Patch system:
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Re: [PATCH] iommu/arm-smmu: fix the module name for disable_bypass parameter

2020-02-11 Thread Li Yang 
On Tue, Feb 11, 2020 at 5:47 PM Russell King - ARM Linux admin
 wrote:
>
> On Tue, Feb 11, 2020 at 05:36:55PM -0600, Li Yang wrote:
> > Since commit cd221bd24ff5 ("iommu/arm-smmu: Allow building as a module"),
> > there is a side effect that the module name is changed from arm-smmu to
> > arm-smmu-mod.  So the kernel parameter for disable_bypass need to be
> > changed too.  Fix the Kconfig help and error message to the correct
> > parameter name.
>
> Hmm, this seems to be a user-visible change - so those of us who have
> been booting with "arm-smmu.disable_bypass=0" now need to change that
> depending on which kernel is being booted - which is not nice, and
> makes the support side on platforms that need this kernel parameter
> harder.

I have sent a new patch replacing this patch.  That patch will keep
the command line unchanged.

>
> >
> > Signed-off-by: Li Yang 
> > ---
> >  drivers/iommu/Kconfig| 2 +-
> >  drivers/iommu/arm-smmu.c | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> > index d2fade984999..fb54be903c60 100644
> > --- a/drivers/iommu/Kconfig
> > +++ b/drivers/iommu/Kconfig
> > @@ -415,7 +415,7 @@ config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
> > hardcode the bypass disable in the code.
> >
> > NOTE: the kernel command line parameter
> > -   'arm-smmu.disable_bypass' will continue to override this
> > +   'arm-smmu-mod.disable_bypass' will continue to override this
> > config.
> >
> >  config ARM_SMMU_V3
> > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> > index 16c4b87af42b..2ffe8ff04393 100644
> > --- a/drivers/iommu/arm-smmu.c
> > +++ b/drivers/iommu/arm-smmu.c
> > @@ -512,7 +512,7 @@ static irqreturn_t arm_smmu_global_fault(int irq, void 
> > *dev)
> >   if (IS_ENABLED(CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT) &&
> >   (gfsr & ARM_SMMU_sGFSR_USF))
> >   dev_err(smmu->dev,
> > - "Blocked unknown Stream ID 0x%hx; boot with 
> > \"arm-smmu.disable_bypass=0\" to allow, but this may have security 
> > implications\n",
> > + "Blocked unknown Stream ID 0x%hx; boot with 
> > \"arm-smmu-mod.disable_bypass=0\" to allow, but this may have security 
> > implications\n",
> >   (u16)gfsynr1);
> >   else
> >   dev_err(smmu->dev,
> > --
> > 2.17.1
> >
> >
> > ___
> > linux-arm-kernel mailing list
> > linux-arm-ker...@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
> According to speedtest.net: 11.9Mbps down 500kbps up
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Re: [PATCH] iommu/arm-smmu: fix the module name for disable_bypass parameter

2020-02-11 Thread Russell King - ARM Linux admin 
On Tue, Feb 11, 2020 at 05:36:55PM -0600, Li Yang wrote:
> Since commit cd221bd24ff5 ("iommu/arm-smmu: Allow building as a module"),
> there is a side effect that the module name is changed from arm-smmu to
> arm-smmu-mod.  So the kernel parameter for disable_bypass need to be
> changed too.  Fix the Kconfig help and error message to the correct
> parameter name.

Hmm, this seems to be a user-visible change - so those of us who have
been booting with "arm-smmu.disable_bypass=0" now need to change that
depending on which kernel is being booted - which is not nice, and
makes the support side on platforms that need this kernel parameter
harder.

> 
> Signed-off-by: Li Yang 
> ---
>  drivers/iommu/Kconfig| 2 +-
>  drivers/iommu/arm-smmu.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> index d2fade984999..fb54be903c60 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -415,7 +415,7 @@ config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
> hardcode the bypass disable in the code.
>  
> NOTE: the kernel command line parameter
> -   'arm-smmu.disable_bypass' will continue to override this
> +   'arm-smmu-mod.disable_bypass' will continue to override this
> config.
>  
>  config ARM_SMMU_V3
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 16c4b87af42b..2ffe8ff04393 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -512,7 +512,7 @@ static irqreturn_t arm_smmu_global_fault(int irq, void 
> *dev)
>   if (IS_ENABLED(CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT) &&
>   (gfsr & ARM_SMMU_sGFSR_USF))
>   dev_err(smmu->dev,
> - "Blocked unknown Stream ID 0x%hx; boot with 
> \"arm-smmu.disable_bypass=0\" to allow, but this may have security 
> implications\n",
> + "Blocked unknown Stream ID 0x%hx; boot with 
> \"arm-smmu-mod.disable_bypass=0\" to allow, but this may have security 
> implications\n",
>   (u16)gfsynr1);
>   else
>   dev_err(smmu->dev,
> -- 
> 2.17.1
> 
> 
> ___
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> 

-- 
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[PATCH] iommu/arm-smmu: fix the module name for disable_bypass parameter

2020-02-11 Thread Li Yang 
Since commit cd221bd24ff5 ("iommu/arm-smmu: Allow building as a module"),
there is a side effect that the module name is changed from arm-smmu to
arm-smmu-mod.  So the kernel parameter for disable_bypass need to be
changed too.  Fix the Kconfig help and error message to the correct
parameter name.

Signed-off-by: Li Yang 
---
 drivers/iommu/Kconfig| 2 +-
 drivers/iommu/arm-smmu.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index d2fade984999..fb54be903c60 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -415,7 +415,7 @@ config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
  hardcode the bypass disable in the code.
 
  NOTE: the kernel command line parameter
- 'arm-smmu.disable_bypass' will continue to override this
+ 'arm-smmu-mod.disable_bypass' will continue to override this
  config.
 
 config ARM_SMMU_V3
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 16c4b87af42b..2ffe8ff04393 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -512,7 +512,7 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev)
if (IS_ENABLED(CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT) &&
(gfsr & ARM_SMMU_sGFSR_USF))
dev_err(smmu->dev,
-   "Blocked unknown Stream ID 0x%hx; boot with 
\"arm-smmu.disable_bypass=0\" to allow, but this may have security 
implications\n",
+   "Blocked unknown Stream ID 0x%hx; boot with 
\"arm-smmu-mod.disable_bypass=0\" to allow, but this may have security 
implications\n",
(u16)gfsynr1);
else
dev_err(smmu->dev,
-- 
2.17.1

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