Re: powerpc/eeh: Fix PE location code

[Michael Ellerman]

On Wed, 2015-02-12 at 05:25:32 UTC, Gavin Shan wrote:
> In eeh_pe_loc_get(), the PE location code is retrieved from the
> "ibm,loc-code" property of the device node for the bridge of the
> PE's primary bus. It's not correct because the property indicates
> the parent PE's location code.
> 
> This reads the correct PE location code from "ibm,io-base-loc-code"
> or "ibm,slot-location-code" property of PE parent bus's device node.
> 
> Signed-off-by: Gavin Shan 
> Tested-by: Russell Currey 

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/7e56f627768da4e6480986b514

cheers
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Re: [PATCH] powerpc/eeh: Fix PE location code

[Stewart Smith]

Sam Mendoza-Jonas  writes:
> On Wed, Jan 20, 2016 at 02:56:13PM +1100, Russell Currey wrote:
>> On Wed, 2015-12-02 at 16:25 +1100, Gavin Shan wrote:
>> > In eeh_pe_loc_get(), the PE location code is retrieved from the
>> > "ibm,loc-code" property of the device node for the bridge of the
>> > PE's primary bus. It's not correct because the property indicates
>> > the parent PE's location code.
>> > 
>> > This reads the correct PE location code from "ibm,io-base-loc-code"
>> > or "ibm,slot-location-code" property of PE parent bus's device node.
>> > 
>> > Signed-off-by: Gavin Shan 
>> > ---
>> 
>> Tested-by: Russell Currey 
>
> Thanks Russell!
>
> W.R.T including this in stable, I don't believe anything actively breaks
> without the patch, but in the event of an EEH freeze the wrong slot for
> the device will be identified, making troubleshooting more difficult.

As someone who's likely going to have to deal with the bug reports for
such things, I like the idea of this going to stable as *maybe* I'll get
fewer of them that I have to close pointing to this commit...

-- 
Stewart Smith
OPAL Architect, IBM.

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Re: [PATCH] powerpc/eeh: Fix PE location code

[Sam Mendoza-Jonas]

On Wed, Jan 20, 2016 at 02:56:13PM +1100, Russell Currey wrote:
> On Wed, 2015-12-02 at 16:25 +1100, Gavin Shan wrote:
> > In eeh_pe_loc_get(), the PE location code is retrieved from the
> > "ibm,loc-code" property of the device node for the bridge of the
> > PE's primary bus. It's not correct because the property indicates
> > the parent PE's location code.
> > 
> > This reads the correct PE location code from "ibm,io-base-loc-code"
> > or "ibm,slot-location-code" property of PE parent bus's device node.
> > 
> > Signed-off-by: Gavin Shan 
> > ---
> 
> Tested-by: Russell Currey 

Thanks Russell!

W.R.T including this in stable, I don't believe anything actively breaks
without the patch, but in the event of an EEH freeze the wrong slot for
the device will be identified, making troubleshooting more difficult.
> >  arch/powerpc/kernel/eeh_pe.c | 33 +++--
> >  1 file changed, 15 insertions(+), 18 deletions(-)
> > 
> > diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
> > index 8654cb1..ca9e537 100644
> > --- a/arch/powerpc/kernel/eeh_pe.c
> > +++ b/arch/powerpc/kernel/eeh_pe.c
> > @@ -883,32 +883,29 @@ void eeh_pe_restore_bars(struct eeh_pe *pe)
> >  const char *eeh_pe_loc_get(struct eeh_pe *pe)
> >  {
> >     struct pci_bus *bus = eeh_pe_bus_get(pe);
> > -   struct device_node *dn = pci_bus_to_OF_node(bus);
> > +   struct device_node *dn;
> >     const char *loc = NULL;
> >  
> > -   if (!dn)
> > -   goto out;
> > +   while (bus) {
> > +   dn = pci_bus_to_OF_node(bus);
> > +   if (!dn) {
> > +   bus = bus->parent;
> > +   continue;
> > +   }
> >  
> > -   /* PHB PE or root PE ? */
> > -   if (pci_is_root_bus(bus)) {
> > -   loc = of_get_property(dn, "ibm,loc-code", NULL);
> > -   if (!loc)
> > +   if (pci_is_root_bus(bus))
> >     loc = of_get_property(dn, "ibm,io-base-loc-
> > code", NULL);
> > +   else
> > +   loc = of_get_property(dn, "ibm,slot-location-
> > code",
> > +     NULL);
> > +
> >     if (loc)
> > -   goto out;
> > +   return loc;
> >  
> > -   /* Check the root port */
> > -   dn = dn->child;
> > -   if (!dn)
> > -   goto out;
> > +   bus = bus->parent;
> >     }
> >  
> > -   loc = of_get_property(dn, "ibm,loc-code", NULL);
> > -   if (!loc)
> > -   loc = of_get_property(dn, "ibm,slot-location-code",
> > NULL);
> > -
> > -out:
> > -   return loc ? loc : "N/A";
> > +   return "N/A";
> >  }
> >  
> >  /**
> 
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Re: [PATCH] powerpc/eeh: Fix PE location code

[Joel Stanley]

Hello Gavin,

On Wed, Dec 2, 2015 at 3:55 PM, Gavin Shan  wrote:
> In eeh_pe_loc_get(), the PE location code is retrieved from the
> "ibm,loc-code" property of the device node for the bridge of the
> PE's primary bus. It's not correct because the property indicates
> the parent PE's location code.
>
> This reads the correct PE location code from "ibm,io-base-loc-code"
> or "ibm,slot-location-code" property of PE parent bus's device node.

I think we want this fix included in stable releases. Is that correct?

Cheers,

Joel

> Signed-off-by: Gavin Shan 
> ---
>  arch/powerpc/kernel/eeh_pe.c | 33 +++--
>  1 file changed, 15 insertions(+), 18 deletions(-)
>
> diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
> index 8654cb1..ca9e537 100644
> --- a/arch/powerpc/kernel/eeh_pe.c
> +++ b/arch/powerpc/kernel/eeh_pe.c
> @@ -883,32 +883,29 @@ void eeh_pe_restore_bars(struct eeh_pe *pe)
>  const char *eeh_pe_loc_get(struct eeh_pe *pe)
>  {
> struct pci_bus *bus = eeh_pe_bus_get(pe);
> -   struct device_node *dn = pci_bus_to_OF_node(bus);
> +   struct device_node *dn;
> const char *loc = NULL;
>
> -   if (!dn)
> -   goto out;
> +   while (bus) {
> +   dn = pci_bus_to_OF_node(bus);
> +   if (!dn) {
> +   bus = bus->parent;
> +   continue;
> +   }
>
> -   /* PHB PE or root PE ? */
> -   if (pci_is_root_bus(bus)) {
> -   loc = of_get_property(dn, "ibm,loc-code", NULL);
> -   if (!loc)
> +   if (pci_is_root_bus(bus))
> loc = of_get_property(dn, "ibm,io-base-loc-code", 
> NULL);
> +   else
> +   loc = of_get_property(dn, "ibm,slot-location-code",
> + NULL);
> +
> if (loc)
> -   goto out;
> +   return loc;
>
> -   /* Check the root port */
> -   dn = dn->child;
> -   if (!dn)
> -   goto out;
> +   bus = bus->parent;
> }
>
> -   loc = of_get_property(dn, "ibm,loc-code", NULL);
> -   if (!loc)
> -   loc = of_get_property(dn, "ibm,slot-location-code", NULL);
> -
> -out:
> -   return loc ? loc : "N/A";
> +   return "N/A";
>  }
>
>  /**
> --
> 2.1.0
>
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Re: [PATCH] powerpc/eeh: Fix PE location code

[Russell Currey]

On Wed, 2015-12-02 at 16:25 +1100, Gavin Shan wrote:
> In eeh_pe_loc_get(), the PE location code is retrieved from the
> "ibm,loc-code" property of the device node for the bridge of the
> PE's primary bus. It's not correct because the property indicates
> the parent PE's location code.
> 
> This reads the correct PE location code from "ibm,io-base-loc-code"
> or "ibm,slot-location-code" property of PE parent bus's device node.
> 
> Signed-off-by: Gavin Shan 
> ---

Tested-by: Russell Currey 

>  arch/powerpc/kernel/eeh_pe.c | 33 +++--
>  1 file changed, 15 insertions(+), 18 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
> index 8654cb1..ca9e537 100644
> --- a/arch/powerpc/kernel/eeh_pe.c
> +++ b/arch/powerpc/kernel/eeh_pe.c
> @@ -883,32 +883,29 @@ void eeh_pe_restore_bars(struct eeh_pe *pe)
>  const char *eeh_pe_loc_get(struct eeh_pe *pe)
>  {
>   struct pci_bus *bus = eeh_pe_bus_get(pe);
> - struct device_node *dn = pci_bus_to_OF_node(bus);
> + struct device_node *dn;
>   const char *loc = NULL;
>  
> - if (!dn)
> - goto out;
> + while (bus) {
> + dn = pci_bus_to_OF_node(bus);
> + if (!dn) {
> + bus = bus->parent;
> + continue;
> + }
>  
> - /* PHB PE or root PE ? */
> - if (pci_is_root_bus(bus)) {
> - loc = of_get_property(dn, "ibm,loc-code", NULL);
> - if (!loc)
> + if (pci_is_root_bus(bus))
>   loc = of_get_property(dn, "ibm,io-base-loc-
> code", NULL);
> + else
> + loc = of_get_property(dn, "ibm,slot-location-
> code",
> +   NULL);
> +
>   if (loc)
> - goto out;
> + return loc;
>  
> - /* Check the root port */
> - dn = dn->child;
> - if (!dn)
> - goto out;
> + bus = bus->parent;
>   }
>  
> - loc = of_get_property(dn, "ibm,loc-code", NULL);
> - if (!loc)
> - loc = of_get_property(dn, "ibm,slot-location-code",
> NULL);
> -
> -out:
> - return loc ? loc : "N/A";
> + return "N/A";
>  }
>  
>  /**

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[PATCH] powerpc/eeh: Fix PE location code

[Gavin Shan]

In eeh_pe_loc_get(), the PE location code is retrieved from the
"ibm,loc-code" property of the device node for the bridge of the
PE's primary bus. It's not correct because the property indicates
the parent PE's location code.

This reads the correct PE location code from "ibm,io-base-loc-code"
or "ibm,slot-location-code" property of PE parent bus's device node.

Signed-off-by: Gavin Shan 
---
 arch/powerpc/kernel/eeh_pe.c | 33 +++--
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
index 8654cb1..ca9e537 100644
--- a/arch/powerpc/kernel/eeh_pe.c
+++ b/arch/powerpc/kernel/eeh_pe.c
@@ -883,32 +883,29 @@ void eeh_pe_restore_bars(struct eeh_pe *pe)
 const char *eeh_pe_loc_get(struct eeh_pe *pe)
 {
struct pci_bus *bus = eeh_pe_bus_get(pe);
-   struct device_node *dn = pci_bus_to_OF_node(bus);
+   struct device_node *dn;
const char *loc = NULL;
 
-   if (!dn)
-   goto out;
+   while (bus) {
+   dn = pci_bus_to_OF_node(bus);
+   if (!dn) {
+   bus = bus->parent;
+   continue;
+   }
 
-   /* PHB PE or root PE ? */
-   if (pci_is_root_bus(bus)) {
-   loc = of_get_property(dn, "ibm,loc-code", NULL);
-   if (!loc)
+   if (pci_is_root_bus(bus))
loc = of_get_property(dn, "ibm,io-base-loc-code", NULL);
+   else
+   loc = of_get_property(dn, "ibm,slot-location-code",
+ NULL);
+
if (loc)
-   goto out;
+   return loc;
 
-   /* Check the root port */
-   dn = dn->child;
-   if (!dn)
-   goto out;
+   bus = bus->parent;
}
 
-   loc = of_get_property(dn, "ibm,loc-code", NULL);
-   if (!loc)
-   loc = of_get_property(dn, "ibm,slot-location-code", NULL);
-
-out:
-   return loc ? loc : "N/A";
+   return "N/A";
 }
 
 /**
-- 
2.1.0

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