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[PATCH v2 4/6] drivers: soc: xilinx: Fix error message on SGI registration failure

Jay Buddhabhatti posted 6 patches 2 years, 2 months ago
There is a newer version of this series
[PATCH v2 4/6] drivers: soc: xilinx: Fix error message on SGI registration failure
Posted by Jay Buddhabhatti 2 years, 2 months ago 
Failure to register SGI for firmware event notification is non-fatal error
when feature is not supported by other modules such as Xen and TF-A. Add
_info level log message for such special case.

Also add XST_PM_INVALID_VERSION error code and map it to -EOPNOSUPP Linux
kernel error code. If feature is not supported or EEMI API version is
mismatch, firmware can return XST_PM_INVALID_VERSION = 4 or
XST_PM_NO_FEATURE = 19 error code.

Co-developed-by: Tanmay Shah <tanmay.shah@amd.com>
Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
---
 drivers/firmware/xilinx/zynqmp.c        | 4 +++-
 drivers/soc/xilinx/xlnx_event_manager.c | 7 ++++++-
 include/linux/firmware/xlnx-zynqmp.h    | 1 +
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 00ea2508f692..de09d77cf1e4 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -92,6 +92,8 @@ static int zynqmp_pm_ret_code(u32 ret_status)
 		return 0;
 	case XST_PM_NO_FEATURE:
 		return -ENOTSUPP;
+	case XST_PM_INVALID_VERSION:
+		return -EOPNOTSUPP;
 	case XST_PM_NO_ACCESS:
 		return -EACCES;
 	case XST_PM_ABORT_SUSPEND:
@@ -379,7 +381,7 @@ int zynqmp_pm_register_sgi(u32 sgi_num, u32 reset)
 
 	ret = zynqmp_pm_invoke_fn(TF_A_PM_REGISTER_SGI, sgi_num, reset, 0, 0,
 				  0, NULL);
-	if (!ret)
+	if (ret != -EOPNOTSUPP && !ret)
 		return ret;
 
 	/* try old implementation as fallback strategy if above fails */
diff --git a/drivers/soc/xilinx/xlnx_event_manager.c b/drivers/soc/xilinx/xlnx_event_manager.c
index 38cfc161a713..bfa5cf4a0cab 100644
--- a/drivers/soc/xilinx/xlnx_event_manager.c
+++ b/drivers/soc/xilinx/xlnx_event_manager.c
@@ -653,7 +653,12 @@ static int xlnx_event_manager_probe(struct platform_device *pdev)
 
 	ret = zynqmp_pm_register_sgi(sgi_num, 0);
 	if (ret) {
-		dev_err(&pdev->dev, "SGI %d Registration over TF-A failed with %d\n", sgi_num, ret);
+		if (ret == -EOPNOTSUPP)
+			dev_info(&pdev->dev, "PM firmware event notification not supported\n");
+		else
+			dev_err(&pdev->dev, "SGI %d registration failed, err %d\n",
+				sgi_num, ret);
+
 		xlnx_event_cleanup_sgi(pdev);
 		return ret;
 	}
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 86fb73269d95..4afd5d63177e 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -160,6 +160,7 @@ enum pm_api_id {
 /* PMU-FW return status codes */
 enum pm_ret_status {
 	XST_PM_SUCCESS = 0,
+	XST_PM_INVALID_VERSION = 4,
 	XST_PM_NO_FEATURE = 19,
 	XST_PM_INTERNAL = 2000,
 	XST_PM_CONFLICT = 2001,
-- 
2.25.1
Re: [PATCH v2 4/6] drivers: soc: xilinx: Fix error message on SGI registration failure
Posted by Greg KH 2 years, 2 months ago 
On Wed, Oct 04, 2023 at 02:41:14AM -0700, Jay Buddhabhatti wrote:
> Failure to register SGI for firmware event notification is non-fatal error
> when feature is not supported by other modules such as Xen and TF-A. Add
> _info level log message for such special case.
> 
> Also add XST_PM_INVALID_VERSION error code and map it to -EOPNOSUPP Linux
> kernel error code. If feature is not supported or EEMI API version is
> mismatch, firmware can return XST_PM_INVALID_VERSION = 4 or
> XST_PM_NO_FEATURE = 19 error code.
> 
> Co-developed-by: Tanmay Shah <tanmay.shah@amd.com>
> Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
> Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
> ---
>  drivers/firmware/xilinx/zynqmp.c        | 4 +++-
>  drivers/soc/xilinx/xlnx_event_manager.c | 7 ++++++-
>  include/linux/firmware/xlnx-zynqmp.h    | 1 +
>  3 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 00ea2508f692..de09d77cf1e4 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -92,6 +92,8 @@ static int zynqmp_pm_ret_code(u32 ret_status)
>  		return 0;
>  	case XST_PM_NO_FEATURE:
>  		return -ENOTSUPP;
> +	case XST_PM_INVALID_VERSION:
> +		return -EOPNOTSUPP;
>  	case XST_PM_NO_ACCESS:
>  		return -EACCES;
>  	case XST_PM_ABORT_SUSPEND:
> @@ -379,7 +381,7 @@ int zynqmp_pm_register_sgi(u32 sgi_num, u32 reset)
>  
>  	ret = zynqmp_pm_invoke_fn(TF_A_PM_REGISTER_SGI, sgi_num, reset, 0, 0,
>  				  0, NULL);
> -	if (!ret)
> +	if (ret != -EOPNOTSUPP && !ret)
>  		return ret;
>  
>  	/* try old implementation as fallback strategy if above fails */
> diff --git a/drivers/soc/xilinx/xlnx_event_manager.c b/drivers/soc/xilinx/xlnx_event_manager.c
> index 38cfc161a713..bfa5cf4a0cab 100644
> --- a/drivers/soc/xilinx/xlnx_event_manager.c
> +++ b/drivers/soc/xilinx/xlnx_event_manager.c
> @@ -653,7 +653,12 @@ static int xlnx_event_manager_probe(struct platform_device *pdev)
>  
>  	ret = zynqmp_pm_register_sgi(sgi_num, 0);
>  	if (ret) {
> -		dev_err(&pdev->dev, "SGI %d Registration over TF-A failed with %d\n", sgi_num, ret);
> +		if (ret == -EOPNOTSUPP)
> +			dev_info(&pdev->dev, "PM firmware event notification not supported\n");

Why is this "info"?  Why not error?

And what is userspace supposed to do with this information if it sees
it?

thanks,

greg k-h
RE: [PATCH v2 4/6] drivers: soc: xilinx: Fix error message on SGI registration failure
Posted by Buddhabhatti, Jay 2 years, 2 months ago 
Hi Greg,

> -----Original Message-----
> From: Greg KH <gregkh@linuxfoundation.org>
> Sent: Wednesday, October 4, 2023 5:45 PM
> To: Buddhabhatti, Jay <jay.buddhabhatti@amd.com>
> Cc: Simek, Michal <michal.simek@amd.com>; Shah, Tanmay
> <tanmay.shah@amd.com>; Manne, Nava kishore
> <nava.kishore.manne@amd.com>; Levinsky, Ben <ben.levinsky@amd.com>;
> robh@kernel.org; dhaval.r.shah@amd.com; marex@denx.de; Shaikh, Izhar
> Ameer <izhar.ameer.shaikh@amd.com>; arnd@arndb.de;
> ruanjinjie@huawei.com; mathieu.poirier@linaro.org; linux-
> kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org
> Subject: Re: [PATCH v2 4/6] drivers: soc: xilinx: Fix error message on SGI
> registration failure
> 
> On Wed, Oct 04, 2023 at 02:41:14AM -0700, Jay Buddhabhatti wrote:
> > Failure to register SGI for firmware event notification is non-fatal
> > error when feature is not supported by other modules such as Xen and
> > TF-A. Add _info level log message for such special case.
> >
> > Also add XST_PM_INVALID_VERSION error code and map it to -EOPNOSUPP
> > Linux kernel error code. If feature is not supported or EEMI API
> > version is mismatch, firmware can return XST_PM_INVALID_VERSION = 4 or
> > XST_PM_NO_FEATURE = 19 error code.
> >
> > Co-developed-by: Tanmay Shah <tanmay.shah@amd.com>
> > Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
> > Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
> > ---
> >  drivers/firmware/xilinx/zynqmp.c        | 4 +++-
> >  drivers/soc/xilinx/xlnx_event_manager.c | 7 ++++++-
> >  include/linux/firmware/xlnx-zynqmp.h    | 1 +
> >  3 files changed, 10 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/firmware/xilinx/zynqmp.c
> > b/drivers/firmware/xilinx/zynqmp.c
> > index 00ea2508f692..de09d77cf1e4 100644
> > --- a/drivers/firmware/xilinx/zynqmp.c
> > +++ b/drivers/firmware/xilinx/zynqmp.c
> > @@ -92,6 +92,8 @@ static int zynqmp_pm_ret_code(u32 ret_status)
> >  		return 0;
> >  	case XST_PM_NO_FEATURE:
> >  		return -ENOTSUPP;
> > +	case XST_PM_INVALID_VERSION:
> > +		return -EOPNOTSUPP;
> >  	case XST_PM_NO_ACCESS:
> >  		return -EACCES;
> >  	case XST_PM_ABORT_SUSPEND:
> > @@ -379,7 +381,7 @@ int zynqmp_pm_register_sgi(u32 sgi_num, u32 reset)
> >
> >  	ret = zynqmp_pm_invoke_fn(TF_A_PM_REGISTER_SGI, sgi_num, reset,
> 0, 0,
> >  				  0, NULL);
> > -	if (!ret)
> > +	if (ret != -EOPNOTSUPP && !ret)
> >  		return ret;
> >
> >  	/* try old implementation as fallback strategy if above fails */
> > diff --git a/drivers/soc/xilinx/xlnx_event_manager.c
> > b/drivers/soc/xilinx/xlnx_event_manager.c
> > index 38cfc161a713..bfa5cf4a0cab 100644
> > --- a/drivers/soc/xilinx/xlnx_event_manager.c
> > +++ b/drivers/soc/xilinx/xlnx_event_manager.c
> > @@ -653,7 +653,12 @@ static int xlnx_event_manager_probe(struct
> > platform_device *pdev)
> >
> >  	ret = zynqmp_pm_register_sgi(sgi_num, 0);
> >  	if (ret) {
> > -		dev_err(&pdev->dev, "SGI %d Registration over TF-A failed with
> %d\n", sgi_num, ret);
> > +		if (ret == -EOPNOTSUPP)
> > +			dev_info(&pdev->dev, "PM firmware event notification
> not
> > +supported\n");
> 
> Why is this "info"?  Why not error?
[Jay] Because it is non-fatal error which will not cause kernel crash.

> 
> And what is userspace supposed to do with this information if it sees it?
[Jay] This message indicates that SGI registration is not supported by other modules like TF-A or Xen. So user need to use TF-A with this support if they want to use event management driver.

Thanks,
Jay
> 
> thanks,
> 
> greg k-h
Re: [PATCH v2 4/6] drivers: soc: xilinx: Fix error message on SGI registration failure
Posted by Greg KH 2 years, 2 months ago 
On Wed, Oct 04, 2023 at 12:48:25PM +0000, Buddhabhatti, Jay wrote:
> Hi Greg,
> 
> > -----Original Message-----
> > From: Greg KH <gregkh@linuxfoundation.org>
> > Sent: Wednesday, October 4, 2023 5:45 PM
> > To: Buddhabhatti, Jay <jay.buddhabhatti@amd.com>
> > Cc: Simek, Michal <michal.simek@amd.com>; Shah, Tanmay
> > <tanmay.shah@amd.com>; Manne, Nava kishore
> > <nava.kishore.manne@amd.com>; Levinsky, Ben <ben.levinsky@amd.com>;
> > robh@kernel.org; dhaval.r.shah@amd.com; marex@denx.de; Shaikh, Izhar
> > Ameer <izhar.ameer.shaikh@amd.com>; arnd@arndb.de;
> > ruanjinjie@huawei.com; mathieu.poirier@linaro.org; linux-
> > kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org
> > Subject: Re: [PATCH v2 4/6] drivers: soc: xilinx: Fix error message on SGI
> > registration failure
> > 
> > On Wed, Oct 04, 2023 at 02:41:14AM -0700, Jay Buddhabhatti wrote:
> > > Failure to register SGI for firmware event notification is non-fatal
> > > error when feature is not supported by other modules such as Xen and
> > > TF-A. Add _info level log message for such special case.
> > >
> > > Also add XST_PM_INVALID_VERSION error code and map it to -EOPNOSUPP
> > > Linux kernel error code. If feature is not supported or EEMI API
> > > version is mismatch, firmware can return XST_PM_INVALID_VERSION = 4 or
> > > XST_PM_NO_FEATURE = 19 error code.
> > >
> > > Co-developed-by: Tanmay Shah <tanmay.shah@amd.com>
> > > Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
> > > Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com>
> > > ---
> > >  drivers/firmware/xilinx/zynqmp.c        | 4 +++-
> > >  drivers/soc/xilinx/xlnx_event_manager.c | 7 ++++++-
> > >  include/linux/firmware/xlnx-zynqmp.h    | 1 +
> > >  3 files changed, 10 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/firmware/xilinx/zynqmp.c
> > > b/drivers/firmware/xilinx/zynqmp.c
> > > index 00ea2508f692..de09d77cf1e4 100644
> > > --- a/drivers/firmware/xilinx/zynqmp.c
> > > +++ b/drivers/firmware/xilinx/zynqmp.c
> > > @@ -92,6 +92,8 @@ static int zynqmp_pm_ret_code(u32 ret_status)
> > >  		return 0;
> > >  	case XST_PM_NO_FEATURE:
> > >  		return -ENOTSUPP;
> > > +	case XST_PM_INVALID_VERSION:
> > > +		return -EOPNOTSUPP;
> > >  	case XST_PM_NO_ACCESS:
> > >  		return -EACCES;
> > >  	case XST_PM_ABORT_SUSPEND:
> > > @@ -379,7 +381,7 @@ int zynqmp_pm_register_sgi(u32 sgi_num, u32 reset)
> > >
> > >  	ret = zynqmp_pm_invoke_fn(TF_A_PM_REGISTER_SGI, sgi_num, reset,
> > 0, 0,
> > >  				  0, NULL);
> > > -	if (!ret)
> > > +	if (ret != -EOPNOTSUPP && !ret)
> > >  		return ret;
> > >
> > >  	/* try old implementation as fallback strategy if above fails */
> > > diff --git a/drivers/soc/xilinx/xlnx_event_manager.c
> > > b/drivers/soc/xilinx/xlnx_event_manager.c
> > > index 38cfc161a713..bfa5cf4a0cab 100644
> > > --- a/drivers/soc/xilinx/xlnx_event_manager.c
> > > +++ b/drivers/soc/xilinx/xlnx_event_manager.c
> > > @@ -653,7 +653,12 @@ static int xlnx_event_manager_probe(struct
> > > platform_device *pdev)
> > >
> > >  	ret = zynqmp_pm_register_sgi(sgi_num, 0);
> > >  	if (ret) {
> > > -		dev_err(&pdev->dev, "SGI %d Registration over TF-A failed with
> > %d\n", sgi_num, ret);
> > > +		if (ret == -EOPNOTSUPP)
> > > +			dev_info(&pdev->dev, "PM firmware event notification
> > not
> > > +supported\n");
> > 
> > Why is this "info"?  Why not error?
> [Jay] Because it is non-fatal error which will not cause kernel crash.

Neither do dev_err() messages :)

And something failed, this isn't just "here's some nice information", it
is "something went wrong" which should be a warning or error in my
opinion.

> > And what is userspace supposed to do with this information if it sees it?
> [Jay] This message indicates that SGI registration is not supported by other modules like TF-A or Xen. So user need to use TF-A with this support if they want to use event management driver.

So perhaps say that here too?  Otherwise how are they supposed to know
that?

thanks,

greg k-h

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