Re: [PATCH] bnx2: Reset device during driver initialization

From: Joerg Roedel
Date: Fri Sep 09 2016 - 04:41:14 EST

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?