From: Gavin Shan <gwshan@linux.vnet.ibm.com>
To: Wei Yang <weiyang@linux.vnet.ibm.com>
Cc: bhelgaas@google.com, linux-pci@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org,
Gavin Shan <gwshan@linux.vnet.ibm.com>
Subject: Re: [PATCH V3 9/9] powerpc/eeh: handle VF PE properly
Date: Thu, 14 May 2015 22:15:17 +1000 [thread overview]
Message-ID: <20150514121516.GA12847@gwshan> (raw)
In-Reply-To: <20150514093531.GA12847@richard>
On Thu, May 14, 2015 at 05:35:31PM +0800, Wei Yang wrote:
>On Wed, May 13, 2015 at 11:16:30AM +1000, Gavin Shan wrote:
>>On Mon, May 04, 2015 at 03:07:38PM +0800, Wei Yang wrote:
>>
>> if (!edev->physfn) {
>> pr_warn("%s: EEH dev %04x:%02x:%02x:%01x not for VF\n",
>> edev->phb->global_number, pdn->busno,
>> PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn));
>> return NULL;
>> }
>>
>>>+
>>>+ driver = eeh_pcid_get(dev);
>>>+ if (driver) {
>>>+ eeh_pcid_put(dev);
>>>+ if (driver->err_handler)
>>>+ return NULL;
>>>+ }
>>
>>dev and driver are NULL for those VFs that have been unplugged. For those
>>VFs weren't unplugged, driver and err_handler should be valid. The code
>>looks correct. However, for consistence, please use EEH_DEV_DISCONNECTED
>>that has been marked to those EEH devices which were unplugged. Do you
>>think it would be better?
>>
>> if (!(dev->flags & EEH_DEV_DISCONNECTED))
>> return NULL;
>>
>
>
>I think this is a nice idea, while this may not work.
>
>We mark the DISCONNECTED flag when remove a PCI device, while before we do the
>hot plug we will detach it from the tree and remove this flag in
>eeh_pe_detach_dev().
>
>This will leads to the VF not be hot plugged.
>
Ok, the following way, with the original idea improved for a bit, would
work for you:
- Don't clear DISCONNECTED flag in eeh_pe_detach_dev().
- Use the flag for your case.
- Clear DISCONNECTED flag after the hogplug is done, right before
eeh_pe_state_clear(pe, EEH_PE_KEEP) in eeh_reset_device().
Thanks,
Gavin
next prev parent reply other threads:[~2015-05-14 12:16 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-04 7:07 [PATCH V3 0/9] VF EEH on Power8 Wei Yang
2015-05-04 7:07 ` [PATCH V3 1/9] pci/iov: rename and export virtfn_add/virtfn_remove Wei Yang
2015-05-11 2:13 ` Gavin Shan
2015-05-04 7:07 ` [PATCH V3 2/9] powerpc/pci_dn: cache vf_index in pci_dn Wei Yang
2015-05-11 2:21 ` Gavin Shan
2015-05-11 5:54 ` Wei Yang
2015-05-12 6:15 ` Gavin Shan
2015-05-12 7:29 ` Wei Yang
2015-05-04 7:07 ` [PATCH V3 3/9] powerpc/pci: remove PCI devices in reverse order Wei Yang
2015-05-04 7:07 ` [PATCH V3 4/9] powerpc/eeh: cache address range just for normal device Wei Yang
2015-05-04 7:07 ` [PATCH V3 5/9] powerpc/eeh: create EEH_PE_VF for VF PE Wei Yang
2015-05-11 2:37 ` Gavin Shan
2015-05-11 6:25 ` Wei Yang
2015-05-12 6:28 ` Gavin Shan
2015-05-12 7:52 ` Wei Yang
2015-05-04 7:07 ` [PATCH V3 6/9] powerpc/powernv: create/release eeh_dev for VF Wei Yang
2015-05-11 2:48 ` Gavin Shan
2015-05-12 8:06 ` Wei Yang
2015-05-12 23:09 ` Gavin Shan
2015-05-04 7:07 ` [PATCH V3 7/9] powerpc/powernv: Support EEH reset for VFs Wei Yang
2015-05-11 3:03 ` Gavin Shan
2015-05-04 7:07 ` [PATCH V3 8/9] powerpc/powernv: Support PCI config restore " Wei Yang
2015-05-11 4:22 ` Gavin Shan
2015-05-12 1:31 ` Wei Yang
2015-05-12 6:34 ` Gavin Shan
2015-05-12 8:16 ` Wei Yang
2015-05-12 23:16 ` Gavin Shan
2015-05-04 7:07 ` [PATCH V3 9/9] powerpc/eeh: handle VF PE properly Wei Yang
2015-05-13 1:16 ` Gavin Shan
2015-05-14 9:35 ` Wei Yang
2015-05-14 12:15 ` Gavin Shan [this message]
2015-05-14 10:02 ` Wei Yang
2015-05-14 12:30 ` Gavin Shan
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