On 11/30/2017 2:27 AM, Jan Beulich wrote:
>>>> On 29.11.17 at 18:38, <[email protected]> wrote:
>>>> In the case of bus or slot reset, our goal is to reset connected PCIe
>>>> fabric/card/endpoint.
>>>> The connected card/endpoint can be multi-function device. So, same
>>>> walk-through and checking
>>>> is needed irrespective of type of reset being used.
>>> I don't follow: The scope of other devices/functions possibly
>>> affected by a reset depends on the type of reset, doesn't it?
>> For PCIe platforms, both slot and bus reset endup resetting all connected
>> device/functions on thesecondary bus (behind the root-port or
>> downstream-port).
> According to my understanding this contradicts the comment
> ahead of pci_reset_slot(), which talks of multiple slots per bus.
> In such a setup, I can't see why resetting on slot would affect
> other slots on the same bus. At the same time the comment
> says that the slot reset may resolve to a bus one when there's
> just a single slot on the bus.
For legacy PCI/PCI-X, we can have multiple slots per bus but not with
PCI-Express
(each link will be on a separate bus). In anycase, we need to
walk-through other
device/functions on the same bus/slot and check their status before
using slot/bus
reset.
Cheers
GOVINDA
From 1585478895470449179@xxx Thu Nov 30 08:28:21 +0000 2017
X-GM-THRID: 1583541656865711781
X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread