On Mon, May 09, 2022 at 11:06:35PM +0100, Robin Murphy wrote:
> The main thing drivers need to do for flush queue support is to actually
> implement the optimisations which make it worthwhile. It's up to individual
> drivers how much use they want to make of the iommu_iotlb_gather mechanism,
> and
On 2022-05-09 18:26, Jason Gunthorpe wrote:
On Mon, May 09, 2022 at 10:59:11AM +0100, Robin Murphy wrote:
IOMMU_DOMAIN_DMA_FQ now effectively takes over the original
semantics of IOMMU_DOMAIN_DMA as the one that depends on
driver-specific functionality.
If I grasp the FQ stuff right, it
On Mon, May 09, 2022 at 10:59:11AM +0100, Robin Murphy wrote:
> IOMMU_DOMAIN_DMA_FQ now effectively takes over the original
> semantics of IOMMU_DOMAIN_DMA as the one that depends on
> driver-specific functionality.
If I grasp the FQ stuff right, it seems that this only requires the
driver to
On 2022-05-06 14:54, Jason Gunthorpe wrote:
On Fri, May 06, 2022 at 02:35:50PM +0100, Robin Murphy wrote:
So you want to say "DMA is always managed" when attaching a domain of
type IOMMU_DOMAIN_UNMANAGED? :)
Touché ;) Just goes to confirm the point above that confusion between
general
On Fri, May 06, 2022 at 02:35:50PM +0100, Robin Murphy wrote:
> > So you want to say "DMA is always managed" when attaching a domain of
> > type IOMMU_DOMAIN_UNMANAGED? :)
>
> Touché ;) Just goes to confirm the point above that confusion between
> general concepts and specific API terms is all
On 2022-05-06 14:10, Jason Gunthorpe wrote:
On Fri, May 06, 2022 at 10:32:50AM +0100, Robin Murphy wrote:
It is as discussed with Robin, NULL means to return the group back to
some platform defined translation, and in some cases this means
returning back to work with the platform's DMA ops -
On Fri, May 06, 2022 at 10:32:50AM +0100, Robin Murphy wrote:
> > > It is as discussed with Robin, NULL means to return the group back to
> > > some platform defined translation, and in some cases this means
> > > returning back to work with the platform's DMA ops - presumably if it
> > > isn't
On 2022/5/6 03:27, Jason Gunthorpe wrote:
On Thu, May 05, 2022 at 07:56:59PM +0100, Robin Murphy wrote:
Ack to that, there are certainly further improvements to consider once we've
got known-working code into a released kernel, but let's not get ahead of
ourselves just now.
Yes please
On 2022-05-06 00:28, Tian, Kevin wrote:
From: Jason Gunthorpe
Sent: Thursday, May 5, 2022 11:33 PM
/*
-* If the group has been claimed already, do not re-attach the default
-* domain.
+* New drivers should support default domains and so the
detach_dev() op
+
> From: Jason Gunthorpe
> Sent: Thursday, May 5, 2022 11:33 PM
> > > /*
> > > - * If the group has been claimed already, do not re-attach the default
> > > - * domain.
> > > + * New drivers should support default domains and so the
> > > detach_dev() op
> > > + * will never be called.
On 2022-05-05 20:27, Jason Gunthorpe wrote:
On Thu, May 05, 2022 at 07:56:59PM +0100, Robin Murphy wrote:
Ack to that, there are certainly further improvements to consider once we've
got known-working code into a released kernel, but let's not get ahead of
ourselves just now.
Yes please
On Thu, May 05, 2022 at 07:56:59PM +0100, Robin Murphy wrote:
> Ack to that, there are certainly further improvements to consider once we've
> got known-working code into a released kernel, but let's not get ahead of
> ourselves just now.
Yes please
> (I'm pretty sure we could get away with a
On 2022-05-05 16:33, Jason Gunthorpe wrote:
On Thu, May 05, 2022 at 10:56:28AM +, Tian, Kevin wrote:
From: Jason Gunthorpe
Sent: Thursday, May 5, 2022 3:09 AM
Once the group enters 'owned' mode it can never be assigned back to the
default_domain or to a NULL domain. It must always be
On Thu, May 05, 2022 at 10:56:28AM +, Tian, Kevin wrote:
> > From: Jason Gunthorpe
> > Sent: Thursday, May 5, 2022 3:09 AM
> >
> > Once the group enters 'owned' mode it can never be assigned back to the
> > default_domain or to a NULL domain. It must always be actively assigned to
>
> worth
> From: Jason Gunthorpe
> Sent: Thursday, May 5, 2022 3:09 AM
>
> Once the group enters 'owned' mode it can never be assigned back to the
> default_domain or to a NULL domain. It must always be actively assigned to
worth pointing out that a NULL domain is not always translated to DMA
blocked on
Once the group enters 'owned' mode it can never be assigned back to the
default_domain or to a NULL domain. It must always be actively assigned to
a current domain. If the caller hasn't provided a domain then the core
must provide an explicit DMA blocking domain that has no DMA map.
Lazily create
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