Re: [PATCH v3 4/4] drivers/vfio: Enable VFIO if EEH is not supported

Gavin Shan
2014-08-07T02:10:07Z

On Wed, Aug 06, 2014 at 11:05:43PM +1000, Alexey Kardashevskiy wrote:
>On 08/06/2014 10:50 PM, Alex Williamson wrote:
>> On Wed, 2014-08-06 at 19:49 +1000, Gavin Shan wrote:
>>> From: Alexey Kardashevskiy <aik@ozlabs.ru>
>>>
>>> The existing vfio_pci_open() fails upon error returned from
>>> vfio_spapr_pci_eeh_open(), which breaks POWER7's P5IOC2 PHB
>>> support which this patch brings back.
>>>
>>> The patch fixes the issue by dropping the return value of
>>> vfio_spapr_pci_eeh_open().
>>>
>>> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
>>> Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
>>> ---
>>> v3: Drop return value of vfio_spapr_pci_eeh_open()
>>> ---
>>> drivers/vfio/pci/vfio_pci.c | 6 +-----
>>> drivers/vfio/vfio_spapr_eeh.c | 4 ++--
>>> include/linux/vfio.h | 5 ++---
>>> 3 files changed, 5 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
>>> index e2ee80f..32d69c8 100644
>>> --- a/drivers/vfio/pci/vfio_pci.c
>>> +++ b/drivers/vfio/pci/vfio_pci.c
>>> @@ -178,11 +178,7 @@ static int vfio_pci_open(void *device_data)
>>> if (ret)
>>> goto error;
>>>
>>> - ret = vfio_spapr_pci_eeh_open(vdev->pdev);
>>> - if (ret) {
>>> - vfio_pci_disable(vdev);
>>> - goto error;
>>> - }
>>> + vfio_spapr_pci_eeh_open(vdev->pdev);
>>> }
>>>
>>> return 0;
>>> diff --git a/drivers/vfio/vfio_spapr_eeh.c b/drivers/vfio/vfio_spapr_eeh.c
>>> index 4779cac..86dfceb 100644
>>> --- a/drivers/vfio/vfio_spapr_eeh.c
>>> +++ b/drivers/vfio/vfio_spapr_eeh.c
>>> @@ -19,9 +19,9 @@
>>> #define DRIVER_DESC "VFIO IOMMU SPAPR EEH"
>>>
>>> /* We might build address mapping here for "fast" path later */
>>> -int vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
>>> +void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
>>> {
>>> - return eeh_dev_open(pdev);
>>> + eeh_dev_open(pdev);
>>
>> Wasn't there some intent to provide a warning message, that would now be
>> done here? Has that idea been dropped?
>
>
>Comrade Gavin just forgot it :)
>
>Gavin, please add it. Thanks!
>

Sure, I'll add following warning message in eeh_dev_open() in
separate patch in v4 in case nobody objects.

int eeh_dev_open(struct pci_dev *pdev)
{
:
/* No EEH device or PE ? */
edev = pci_dev_to_eeh_dev(pdev);
if (!edev || !edev->pe) {
pr_warn_once("%s: Device %s not supported\n",
__func__, pci_name(pdev));
goto out;
}
:
}

Thanks,
Gavin

>
>
>>
>>> }
>>> EXPORT_SYMBOL_GPL(vfio_spapr_pci_eeh_open);
>>>
>>> diff --git a/include/linux/vfio.h b/include/linux/vfio.h
>>> index 224128a..d320411 100644
>>> --- a/include/linux/vfio.h
>>> +++ b/include/linux/vfio.h
>>> @@ -100,15 +100,14 @@ extern long vfio_external_check_extension(struct vfio_group *group,
>>>
>>> struct pci_dev;
>>> #ifdef CONFIG_EEH
>>> -extern int vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
>>> +extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
>>> extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
>>> extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
>>> unsigned int cmd,
>>> unsigned long arg);
>>> #else
>>> -static inline int vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
>>> +static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
>>> {
>>> - return 0;
>>> }
>>>
>>> static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
>>
>>
>>
>
>
>--
>Alexey
>

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