On Fri, 5 Jan 2018 10:10:51 -0700
Logan Gunthorpe wrote:
> On 04/01/18 08:33 PM, Alex Williamson wrote:
> > That's exactly what IOMMU groups represent, the smallest set of devices
> > which have DMA isolation from other devices. By poking this hole, the
> > IOMMU group is
On Fri, 5 Jan 2018 10:10:51 -0700
Logan Gunthorpe wrote:
> On 04/01/18 08:33 PM, Alex Williamson wrote:
> > That's exactly what IOMMU groups represent, the smallest set of devices
> > which have DMA isolation from other devices. By poking this hole, the
> > IOMMU group is invalid. We cannot
On 04/01/18 08:33 PM, Alex Williamson wrote:
That's exactly what IOMMU groups represent, the smallest set of devices
which have DMA isolation from other devices. By poking this hole, the
IOMMU group is invalid. We cannot turn off ACS only for a specific
device, in order to enable p2p it
On 04/01/18 08:33 PM, Alex Williamson wrote:
That's exactly what IOMMU groups represent, the smallest set of devices
which have DMA isolation from other devices. By poking this hole, the
IOMMU group is invalid. We cannot turn off ACS only for a specific
device, in order to enable p2p it
On Fri, 5 Jan 2018 01:47:01 -0500
Jerome Glisse wrote:
> On Thu, Jan 04, 2018 at 08:33:00PM -0700, Alex Williamson wrote:
> > On Thu, 4 Jan 2018 17:00:47 -0700
> > Logan Gunthorpe wrote:
> >
> > > On 04/01/18 03:35 PM, Alex Williamson wrote:
> > > >
On Fri, 5 Jan 2018 01:47:01 -0500
Jerome Glisse wrote:
> On Thu, Jan 04, 2018 at 08:33:00PM -0700, Alex Williamson wrote:
> > On Thu, 4 Jan 2018 17:00:47 -0700
> > Logan Gunthorpe wrote:
> >
> > > On 04/01/18 03:35 PM, Alex Williamson wrote:
> > > > Yep, flipping these ACS bits invalidates
On Thu, Jan 04, 2018 at 08:33:00PM -0700, Alex Williamson wrote:
> On Thu, 4 Jan 2018 17:00:47 -0700
> Logan Gunthorpe wrote:
>
> > On 04/01/18 03:35 PM, Alex Williamson wrote:
> > > Yep, flipping these ACS bits invalidates any IOMMU groups that depend
> > > on the isolation
On Thu, Jan 04, 2018 at 08:33:00PM -0700, Alex Williamson wrote:
> On Thu, 4 Jan 2018 17:00:47 -0700
> Logan Gunthorpe wrote:
>
> > On 04/01/18 03:35 PM, Alex Williamson wrote:
> > > Yep, flipping these ACS bits invalidates any IOMMU groups that depend
> > > on the isolation of that downstream
On Thu, 4 Jan 2018 17:00:47 -0700
Logan Gunthorpe wrote:
> On 04/01/18 03:35 PM, Alex Williamson wrote:
> > Yep, flipping these ACS bits invalidates any IOMMU groups that depend
> > on the isolation of that downstream port and I suspect also any peers
> > within the same PCI
On Thu, 4 Jan 2018 17:00:47 -0700
Logan Gunthorpe wrote:
> On 04/01/18 03:35 PM, Alex Williamson wrote:
> > Yep, flipping these ACS bits invalidates any IOMMU groups that depend
> > on the isolation of that downstream port and I suspect also any peers
> > within the same PCI slot of that port
On 04/01/18 05:00 PM, Logan Gunthorpe wrote:
>
>
> On 04/01/18 03:35 PM, Alex Williamson wrote:
>> Yep, flipping these ACS bits invalidates any IOMMU groups that depend
>> on the isolation of that downstream port and I suspect also any peers
>> within the same PCI slot of that port and their
On 04/01/18 05:00 PM, Logan Gunthorpe wrote:
>
>
> On 04/01/18 03:35 PM, Alex Williamson wrote:
>> Yep, flipping these ACS bits invalidates any IOMMU groups that depend
>> on the isolation of that downstream port and I suspect also any peers
>> within the same PCI slot of that port and their
On 04/01/18 03:35 PM, Alex Williamson wrote:
Yep, flipping these ACS bits invalidates any IOMMU groups that depend
on the isolation of that downstream port and I suspect also any peers
within the same PCI slot of that port and their downstream devices. The
entire sub-hierarchy grouping needs
On 04/01/18 03:35 PM, Alex Williamson wrote:
Yep, flipping these ACS bits invalidates any IOMMU groups that depend
on the isolation of that downstream port and I suspect also any peers
within the same PCI slot of that port and their downstream devices. The
entire sub-hierarchy grouping needs
On Thu, 4 Jan 2018 15:57:21 -0600
Bjorn Helgaas wrote:
> [+cc Alex]
>
> On Thu, Jan 04, 2018 at 12:01:29PM -0700, Logan Gunthorpe wrote:
> > When the ACS P2P flags are set in the downstream port of the switch,
> > any P2P TLPs will be sent back to the root complex. The whole
On Thu, 4 Jan 2018 15:57:21 -0600
Bjorn Helgaas wrote:
> [+cc Alex]
>
> On Thu, Jan 04, 2018 at 12:01:29PM -0700, Logan Gunthorpe wrote:
> > When the ACS P2P flags are set in the downstream port of the switch,
> > any P2P TLPs will be sent back to the root complex. The whole point of
> > the
[+cc Alex]
On Thu, Jan 04, 2018 at 12:01:29PM -0700, Logan Gunthorpe wrote:
> When the ACS P2P flags are set in the downstream port of the switch,
> any P2P TLPs will be sent back to the root complex. The whole point of
> the P2P work is to have TLPs avoid the RC seeing it may not support
> P2P
[+cc Alex]
On Thu, Jan 04, 2018 at 12:01:29PM -0700, Logan Gunthorpe wrote:
> When the ACS P2P flags are set in the downstream port of the switch,
> any P2P TLPs will be sent back to the root complex. The whole point of
> the P2P work is to have TLPs avoid the RC seeing it may not support
> P2P
When the ACS P2P flags are set in the downstream port of the switch,
any P2P TLPs will be sent back to the root complex. The whole point of
the P2P work is to have TLPs avoid the RC seeing it may not support
P2P transactions or, at best, it will perform poorly. So we clear these
flags for all
When the ACS P2P flags are set in the downstream port of the switch,
any P2P TLPs will be sent back to the root complex. The whole point of
the P2P work is to have TLPs avoid the RC seeing it may not support
P2P transactions or, at best, it will perform poorly. So we clear these
flags for all
20 matches
Mail list logo