Re: [Qemu-devel] [PATCH v3] hcd-ohci: add dma error handling

[Gerd Hoffmann <kraxel@redhat.com>]

On 07/26/13 12:10, Benjamin Herrenschmidt wrote:
> On Fri, 2013-07-26 at 11:58 +0200, Gerd Hoffmann wrote:
>> On 07/26/13 11:10, Alexey Kardashevskiy wrote:
>>> Current hcd-ohci does not handle DMA errors. However they may happen
>>> so here we introduce simple error handling.
>>>
>>> On such errors, a typical OHCI will stop operating, signal the guest
>>> about the error by sending "UnrecoverableError Event", set itself into
>>> error state and set "Detected Parity Error" in its PCI config space
>>> to signal that it got an error and so does the patch.
>>>
>>> This also adds ohci_stop() call to ohci_bus_start() to handle possible
>>> failure of qemu_new_timer_ns().
>>>
>>> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
>>
>> Looks sane to me now.  When I get an ack from Benjamin I'll go put it
>> into the usb patch queue.
> 
> From me ? Heh, I barely remember what the code looks like in there, if
> you are both happy with it I don't think you need me :-)

Well, ppc emulation uses ohci so I through an ack from a ppc person
which also commented on previous revisions would be nice to have ...

> The only possibly comment is that I would have called ohci_stop() something
> a bit clearer such as ohci_die() or ohci_buserror() ... IE. That function
> does more than just "stop", it also signals an error, and that attribute
> should probably be described by the function name.

xhci has an xhci_die() function for simliar purposes so I think
ohci_die() would be a good pick.

cheers,
  Gerd