Re: [PATCH v4 0/4] PCI: arm64/powerpc: Fix parsing of linux,pci-probe-only

[Bjorn Helgaas]

On Fri, Sep 04, 2015 at 05:50:07PM +0100, Marc Zyngier wrote:
> The pci-host-generic driver parses the linux,pci-probe-only property,
> and assumes that it will have a boolean parameter.
> 
> Turns out that the Seattle DTS file has a naked "linux,pci-probe-only"
> property, which leads to the driver dereferencing some unsuspecting
> memory location. Nothing really bad happens (we end up reading some
> other bit of DT, fortunately), but that not a reason to keep it this
> way. Turns out that the Pseries code (where this code was lifted from)
> may suffer from the same issue.
> 
> The first patch introduces a common (and fixed) version of that check
> that can be used by drivers and architectures that require it. The two
> following patches change the pci-host-generic driver and the powerpc
> code to use it.
> 
> Finally, the bad property is removed from the Seatle DTS, because it
> is simply not necessary (it actually prevents me from using SR-IOV,
> which otherwise runs fine without the probe-only thing).
> 
> This has been tested on the offending Seattle board.
> 
> * From v3:
>   - Restrict the property lookup to /chosen (Rob)
>   - Acked-by on patch #4 from Suravee
>   - I swear this is the last time I rework these patches! ;-)
> 
> * From v2:
>   - Use of_property_read_u32 to safely read the property (Rob)
>   - Add a log message to indicate when we enable probe-only
> (probably quite useful for debugging)
> 
> * From v1:
>   - Consolidate the parsing in of_pci.c (Bjorn)
> 
> Marc Zyngier (4):
>   of/pci: Add of_pci_check_probe_only to parse "linux,pci-probe-only"
>   PCI: pci-host-generic: Fix lookup of linux,pci-probe-only property
>   powerpc: PCI: Fix lookup of linux,pci-probe-only property
>   arm64: dts: Drop linux,pci-probe-only from the Seattle DTS
> 
>  arch/arm64/boot/dts/amd/amd-overdrive.dts |  1 -
>  arch/powerpc/platforms/pseries/setup.c| 14 ++
>  drivers/of/of_pci.c   | 28 
>  drivers/pci/host/pci-host-generic.c   |  9 +
>  include/linux/of_pci.h|  3 +++
>  5 files changed, 34 insertions(+), 21 deletions(-)

Applied with the comment tweak and acks to pci/host-generic for v4.4,
thanks!
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Re: [PATCH v4 0/4] PCI: arm64/powerpc: Fix parsing of linux, pci-probe-only

[Bjorn Helgaas]

On Thu, Sep 17, 2015 at 12:17 PM, Marc Zyngier  wrote:
> On 17/09/15 16:30, Bjorn Helgaas wrote:
>> On Fri, Sep 04, 2015 at 05:50:07PM +0100, Marc Zyngier wrote:
>>> The pci-host-generic driver parses the linux,pci-probe-only property,
>>> and assumes that it will have a boolean parameter.
>>>
>>> Turns out that the Seattle DTS file has a naked "linux,pci-probe-only"
>>> property, which leads to the driver dereferencing some unsuspecting
>>> memory location. Nothing really bad happens (we end up reading some
>>> other bit of DT, fortunately), but that not a reason to keep it this
>>> way. Turns out that the Pseries code (where this code was lifted from)
>>> may suffer from the same issue.
>>>
>>> The first patch introduces a common (and fixed) version of that check
>>> that can be used by drivers and architectures that require it. The two
>>> following patches change the pci-host-generic driver and the powerpc
>>> code to use it.
>>>
>>> Finally, the bad property is removed from the Seatle DTS, because it
>>> is simply not necessary (it actually prevents me from using SR-IOV,
>>> which otherwise runs fine without the probe-only thing).
>>>
>>> This has been tested on the offending Seattle board.
>>>
>>> * From v3:
>>>   - Restrict the property lookup to /chosen (Rob)
>>>   - Acked-by on patch #4 from Suravee
>>>   - I swear this is the last time I rework these patches! ;-)
>>>
>>> * From v2:
>>>   - Use of_property_read_u32 to safely read the property (Rob)
>>>   - Add a log message to indicate when we enable probe-only
>>> (probably quite useful for debugging)
>>>
>>> * From v1:
>>>   - Consolidate the parsing in of_pci.c (Bjorn)
>>>
>>> Marc Zyngier (4):
>>>   of/pci: Add of_pci_check_probe_only to parse "linux,pci-probe-only"
>>>   PCI: pci-host-generic: Fix lookup of linux,pci-probe-only property
>>>   powerpc: PCI: Fix lookup of linux,pci-probe-only property
>>>   arm64: dts: Drop linux,pci-probe-only from the Seattle DTS
>>>
>>>  arch/arm64/boot/dts/amd/amd-overdrive.dts |  1 -
>>>  arch/powerpc/platforms/pseries/setup.c| 14 ++
>>>  drivers/of/of_pci.c   | 28 
>>>  drivers/pci/host/pci-host-generic.c   |  9 +
>>>  include/linux/of_pci.h|  3 +++
>>>  5 files changed, 34 insertions(+), 21 deletions(-)
>>
>> Applied with the comment tweak and acks to pci/host-generic for v4.4,
>> thanks!
>
> Turns out that the 01.org infrastructure has picked up on a compilation
> bug with randconfig. The following patch seems to fix it and should be
> applied on the first patch:
>
> diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
> index 485d625..2da5abc 100644
> --- a/drivers/of/of_pci.c
> +++ b/drivers/of/of_pci.c
> @@ -6,6 +6,8 @@
>  #include 
>  #include 
>
> +#include 
> +
>  static inline int __of_pci_pci_compare(struct device_node *node,
>unsigned int data)
>  {
>
> Sorry for the annoyance.

Folded in and re-pushed, thanks!
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Re: [PATCH v4 0/4] PCI: arm64/powerpc: Fix parsing of linux, pci-probe-only

[Marc Zyngier]

On 17/09/15 16:30, Bjorn Helgaas wrote:
> On Fri, Sep 04, 2015 at 05:50:07PM +0100, Marc Zyngier wrote:
>> The pci-host-generic driver parses the linux,pci-probe-only property,
>> and assumes that it will have a boolean parameter.
>>
>> Turns out that the Seattle DTS file has a naked "linux,pci-probe-only"
>> property, which leads to the driver dereferencing some unsuspecting
>> memory location. Nothing really bad happens (we end up reading some
>> other bit of DT, fortunately), but that not a reason to keep it this
>> way. Turns out that the Pseries code (where this code was lifted from)
>> may suffer from the same issue.
>>
>> The first patch introduces a common (and fixed) version of that check
>> that can be used by drivers and architectures that require it. The two
>> following patches change the pci-host-generic driver and the powerpc
>> code to use it.
>>
>> Finally, the bad property is removed from the Seatle DTS, because it
>> is simply not necessary (it actually prevents me from using SR-IOV,
>> which otherwise runs fine without the probe-only thing).
>>
>> This has been tested on the offending Seattle board.
>>
>> * From v3:
>>   - Restrict the property lookup to /chosen (Rob)
>>   - Acked-by on patch #4 from Suravee
>>   - I swear this is the last time I rework these patches! ;-)
>>
>> * From v2:
>>   - Use of_property_read_u32 to safely read the property (Rob)
>>   - Add a log message to indicate when we enable probe-only
>> (probably quite useful for debugging)
>>
>> * From v1:
>>   - Consolidate the parsing in of_pci.c (Bjorn)
>>
>> Marc Zyngier (4):
>>   of/pci: Add of_pci_check_probe_only to parse "linux,pci-probe-only"
>>   PCI: pci-host-generic: Fix lookup of linux,pci-probe-only property
>>   powerpc: PCI: Fix lookup of linux,pci-probe-only property
>>   arm64: dts: Drop linux,pci-probe-only from the Seattle DTS
>>
>>  arch/arm64/boot/dts/amd/amd-overdrive.dts |  1 -
>>  arch/powerpc/platforms/pseries/setup.c| 14 ++
>>  drivers/of/of_pci.c   | 28 
>>  drivers/pci/host/pci-host-generic.c   |  9 +
>>  include/linux/of_pci.h|  3 +++
>>  5 files changed, 34 insertions(+), 21 deletions(-)
> 
> Applied with the comment tweak and acks to pci/host-generic for v4.4,
> thanks!

Turns out that the 01.org infrastructure has picked up on a compilation
bug with randconfig. The following patch seems to fix it and should be
applied on the first patch:

diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 485d625..2da5abc 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -6,6 +6,8 @@
 #include 
 #include 
 
+#include 
+
 static inline int __of_pci_pci_compare(struct device_node *node,
   unsigned int data)
 {

Sorry for the annoyance.

M.
-- 
Jazz is not dead. It just smells funny...
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[PATCH v4 0/4] PCI: arm64/powerpc: Fix parsing of linux, pci-probe-only

[Marc Zyngier]

The pci-host-generic driver parses the linux,pci-probe-only property,
and assumes that it will have a boolean parameter.

Turns out that the Seattle DTS file has a naked "linux,pci-probe-only"
property, which leads to the driver dereferencing some unsuspecting
memory location. Nothing really bad happens (we end up reading some
other bit of DT, fortunately), but that not a reason to keep it this
way. Turns out that the Pseries code (where this code was lifted from)
may suffer from the same issue.

The first patch introduces a common (and fixed) version of that check
that can be used by drivers and architectures that require it. The two
following patches change the pci-host-generic driver and the powerpc
code to use it.

Finally, the bad property is removed from the Seatle DTS, because it
is simply not necessary (it actually prevents me from using SR-IOV,
which otherwise runs fine without the probe-only thing).

This has been tested on the offending Seattle board.

* From v3:
  - Restrict the property lookup to /chosen (Rob)
  - Acked-by on patch #4 from Suravee
  - I swear this is the last time I rework these patches! ;-)

* From v2:
  - Use of_property_read_u32 to safely read the property (Rob)
  - Add a log message to indicate when we enable probe-only
(probably quite useful for debugging)

* From v1:
  - Consolidate the parsing in of_pci.c (Bjorn)

Marc Zyngier (4):
  of/pci: Add of_pci_check_probe_only to parse "linux,pci-probe-only"
  PCI: pci-host-generic: Fix lookup of linux,pci-probe-only property
  powerpc: PCI: Fix lookup of linux,pci-probe-only property
  arm64: dts: Drop linux,pci-probe-only from the Seattle DTS

 arch/arm64/boot/dts/amd/amd-overdrive.dts |  1 -
 arch/powerpc/platforms/pseries/setup.c| 14 ++
 drivers/of/of_pci.c   | 28 
 drivers/pci/host/pci-host-generic.c   |  9 +
 include/linux/of_pci.h|  3 +++
 5 files changed, 34 insertions(+), 21 deletions(-)

-- 
2.1.4

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Re: [PATCH v4 0/4] PCI: arm64/powerpc: Fix parsing of linux, pci-probe-only

[Rob Herring]

On Fri, Sep 4, 2015 at 11:50 AM, Marc Zyngier  wrote:
> The pci-host-generic driver parses the linux,pci-probe-only property,
> and assumes that it will have a boolean parameter.
>
> Turns out that the Seattle DTS file has a naked "linux,pci-probe-only"
> property, which leads to the driver dereferencing some unsuspecting
> memory location. Nothing really bad happens (we end up reading some
> other bit of DT, fortunately), but that not a reason to keep it this
> way. Turns out that the Pseries code (where this code was lifted from)
> may suffer from the same issue.
>
> The first patch introduces a common (and fixed) version of that check
> that can be used by drivers and architectures that require it. The two
> following patches change the pci-host-generic driver and the powerpc
> code to use it.
>
> Finally, the bad property is removed from the Seatle DTS, because it
> is simply not necessary (it actually prevents me from using SR-IOV,
> which otherwise runs fine without the probe-only thing).
>
> This has been tested on the offending Seattle board.
>
> * From v3:
>   - Restrict the property lookup to /chosen (Rob)
>   - Acked-by on patch #4 from Suravee
>   - I swear this is the last time I rework these patches! ;-)
>
> * From v2:
>   - Use of_property_read_u32 to safely read the property (Rob)
>   - Add a log message to indicate when we enable probe-only
> (probably quite useful for debugging)
>
> * From v1:
>   - Consolidate the parsing in of_pci.c (Bjorn)
>
> Marc Zyngier (4):
>   of/pci: Add of_pci_check_probe_only to parse "linux,pci-probe-only"
>   PCI: pci-host-generic: Fix lookup of linux,pci-probe-only property
>   powerpc: PCI: Fix lookup of linux,pci-probe-only property
>   arm64: dts: Drop linux,pci-probe-only from the Seattle DTS
>
>  arch/arm64/boot/dts/amd/amd-overdrive.dts |  1 -
>  arch/powerpc/platforms/pseries/setup.c| 14 ++
>  drivers/of/of_pci.c   | 28 
>  drivers/pci/host/pci-host-generic.c   |  9 +
>  include/linux/of_pci.h|  3 +++
>  5 files changed, 34 insertions(+), 21 deletions(-)

For the series:

Reviewed-by: Rob Herring 

Rob
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