On Thu, May 14, 2015 at 06:02:50PM +0800, Wei Yang wrote:
>On Wed, May 13, 2015 at 11:16:30AM +1000, Gavin Shan wrote:
>>> * Actually, we should remove the PCI bridges as well.
>>>@@ -416,7 +450,7 @@ static void *eeh_rmv_device(void *data, void *userdata)
>>> driver = eeh_pcid_get(dev);
>>> if (driver) {
>>> eeh_pcid_put(dev);
>>>- if (driver->err_handler)
>>>+ if (removed && driver->err_handler)
>>> return NULL;
>>> }
>>>
>>>@@ -425,11 +459,21 @@ static void *eeh_rmv_device(void *data, void *userdata)
>>> pci_name(dev));
>>> edev->bus = dev->bus;
>>> edev->mode |= EEH_DEV_DISCONNECTED;
>>>- (*removed)++;
>>>-
>>>- pci_lock_rescan_remove();
>>>- pci_stop_and_remove_bus_device(dev);
>>>- pci_unlock_rescan_remove();
>>>+ if (removed)
>>>+ (*removed)++;
>>>+
>>>+#ifdef CONFIG_PCI_IOV
>>>+ if (edev->mode & EEH_DEV_VF) {
>>>+ pci_iov_virtfn_remove(edev->physfn, pdn->vf_index, 0);
>>>+ edev->pdev = NULL;
>>>+ pdn->pe_number = IODA_INVALID_PE;
>>
>>Setting the PE number to invalid one seems not correct because the PE
>>is still consumed by the VF's RID.
>>
>
>In commit 781a868f3136, we introduce the check of pdn->pe_number in
>pnv_pci_dma_dev_setup(). Since VFs are create/released dynamically, we need to
>delay the bind between PE and the device. Then to avoid rebind it, we check
>the pdn->pe_number. The WARN_ON() is what you suggested.
>
>So if don't clear the pe_number here, we break that rule.
>
Ok. You choose one of the following two options:
- Remove WARN_ON() in pnv_pci_dma_dev_setup(). Actually, I don't think
it's quite correct to update PE# to VF's pdn at this function. Instead,
it would have been done at the SRIOV enablement backend. But it's not
related to this patchset. You may improve it later.
- Keep the code you had: set the PE# to invalid one, and put some comments
here as below.
/*
* We have to set the VF PE number to invalid one, which is required
* to plug the VF successfully.
*/
Thanks,
Gavin
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