[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 9 Sep 2016 16:50:05 +0800
From: Baoquan He <bhe@...hat.com>
To: Joerg Roedel <joro@...tes.org>
Cc: sony.chacko@...gic.com, Dept-HSGLinuxNICDev@...gic.com,
linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
netdev@...r.kernel.org, dyoung@...hat.com
Subject: Re: [PATCH] bnx2: Reset device during driver initialization
On 09/09/16 at 10:41am, Joerg Roedel wrote:
>
> Hi Baoquan,
>
> On Fri, Sep 09, 2016 at 04:22:25PM +0800, Baoquan He wrote:
> > Recently I tried to fix the kdump failure in amd iommu system again, and
> > now the latest code works, IO_PAGE_FAULT can't be seen any more. But on
> > several amd iommu system with bnx2 NIC, always IO_PAGE_FAULT will be
> > printed out. After investegating I found out bnx2 driver doesn't reset
> > hardware/reg like other pci device, it does the reset job in bnx2_open
> > which is the net device up stage. So with this patch the IO_PAGE_FAULT
> > is away too on the system with bnx2 NIC. I will
> >
> > However when I got a intel system with vt-d and bnx2 NIC, kdump works
> > well, and no any error message can be seen. From code it clearly shows
> > the domain assignment is done in __intel_map_single, at this time bnx2
> > driver hasn't reset device, the on-flight DMA should still exist. Do you
> > have any idea on this? Or I missed anything? I also deferred the
> > set_dte_entry calling to __map_single calling, the principal should be
> > similar.
>
> Did you make sure that all unity-mappings are in place in the newly
> assigned domain for the bnx2 device before domains are switched?
About unity-mappings, are you saying it for intel iommu or amd iommu?
For amd iommu, I just skip call set_dte_entry calling during iommu
device init stage. Then in device init stage, namely __map_single, judge
and call set_dte_entry there to install the new pt_root into the related
dev table entry.
Thought you mention it, let me look into the unity-mappings of amd iommu
again.
Thanks a lot!
Powered by blists - more mailing lists