On 2013/10/11 14:16, Gavin Shan wrote:
> On Fri, Oct 11, 2013 at 04:49:56PM +1100, Benjamin Herrenschmidt wrote:
>> On Fri, 2013-09-06 at 14:30 -0600, Bjorn Helgaas wrote:
>>> On Thu, Sep 05, 2013 at 03:55:27PM +0800, Yijing Wang wrote:
>>>> Use pci_is_pcie() to simplify code.
>>>>
>>>> Acked-by: Kumar Gala <ga...@kernel.crashing.org>
>>>> Reviewed-by: Gavin Shan <sha...@linux.vnet.ibm.com>
>>>> Signed-off-by: Yijing Wang <wangyij...@huawei.com>
>>>> Cc: Gavin Shan <sha...@linux.vnet.ibm.com>
>>>> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
>>>> Cc: Paul Mackerras <pau...@samba.org>
>>>> Cc: linuxppc-dev@lists.ozlabs.org
>>>> Cc: linux-ker...@vger.kernel.org
>>>> ---
>>>> arch/powerpc/kernel/eeh.c | 3 +--
>>>> arch/powerpc/sysdev/fsl_pci.c | 2 +-
>>>> 2 files changed, 2 insertions(+), 3 deletions(-)
>>>
>>> Ben, Paul, this has no dependencies on anything new to PCI or any
>>> other patches in this series, so you can take it through the POWERPC
>>> tree. If you don't want to do that, let me know and I can take it.
>>>
>>> If you want it:
>>>
>>> Acked-by: Bjorn Helgaas <bhelg...@google.com>
>>
>> It's also quite broken :-)
>>
>> See below:
>>
>>>> diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
>>>> index 55593ee..6ebbe54 100644
>>>> --- a/arch/powerpc/kernel/eeh.c
>>>> +++ b/arch/powerpc/kernel/eeh.c
>>>> @@ -189,8 +189,7 @@ static size_t eeh_gather_pci_data(struct eeh_dev
>>>> *edev, char * buf, size_t len)
>>>> }
>>>>
>>>> /* If PCI-E capable, dump PCI-E cap 10, and the AER */
>>>> - cap = pci_find_capability(dev, PCI_CAP_ID_EXP);
>>>> - if (cap) {
>>>> + if (pci_is_pcie(dev)) {
>>>> n += scnprintf(buf+n, len-n, "pci-e cap10:\n");
>>>> printk(KERN_WARNING
>>>> "EEH: PCI-E capabilities and status follow:\n");
>>
>> So we remove reading of "cap", but slightly further down the code does:
>>
>> for (i=0; i<=8; i++) {
>> eeh_ops->read_config(dn, cap+4*i, 4, &cfg);
>> n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg);
>> printk(KERN_WARNING "EEH: PCI-E %02x: %08x\n", i, cfg);
>> }
>>
>> Which actually *uses* the value of "cap" ... oops :-)
>>
>
> It's my fault and I should have looked into the changes more closely.
> How about changing it like this:
>
> cap = pci_is_pcie(dev) ? pci_pcie_cap(dev) :
> pci_find_capability(dev, PCI_CAP_ID_EXP);
> if (cap) {
> ...
> }
>
> It would save some PCI-CFG access cycles for most cases :-)
Hi Gavin, it's not your fault, it's my fault. :)
Because pci_pcie_cap(dev) == dev->pcie_cap == pci_find_capability(dev,
PCI_CAP_ID_EXP);
so I think it's ok to use dev->pcie_cap instead of stale "cap".
I have updated this patch.
Thanks for your review and comments!
Thanks!
Yijing.
>
>>>> diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
>>>> index 46ac1dd..5402a1d 100644
>>>> --- a/arch/powerpc/sysdev/fsl_pci.c
>>>> +++ b/arch/powerpc/sysdev/fsl_pci.c
>>>> @@ -41,7 +41,7 @@ static void quirk_fsl_pcie_header(struct pci_dev *dev)
>>>> u8 hdr_type;
>>>>
>>>> /* if we aren't a PCIe don't bother */
>>>> - if (!pci_find_capability(dev, PCI_CAP_ID_EXP))
>>>> + if (!pci_is_pcie(dev))
>>>> return;
>>>>
>>>> /* if we aren't in host mode don't bother */
>
> Thanks,
> Gavin
>
>
> .
>
--
Thanks!
Yijing
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