On Thursday 15 January 2015 11:12:17 Will Deacon wrote:
> On Thu, Jan 15, 2015 at 08:28:44AM +, Thierry Reding wrote:
> > On Wed, Jan 14, 2015 at 10:46:10AM +, Will Deacon wrote:
> > > On Wed, Jan 14, 2015 at 09:00:24AM +, Alexandre Courbot wrote:
> > [...]
> >
> >>> 2) Say you want to
On 13/01/15 08:02, Yingjoe Chen wrote:
On Mon, 2015-01-12 at 20:48 +, Robin Murphy wrote:
Hi all,
Whilst it's a long way off perfect, this has reached the point of being
functional and stable enough to be useful, so here it is. The core
consists of the meat of the arch/arm implementation mo
IOMMU operations can be expensive and it's not very difficult for a
user to give us a lot of work to do for a map or unmap operation.
Killing a large VM will vfio assigned devices can result in soft
lockups and IOMMU tracing shows that we can easily spend 80% of our
time with need-resched set. A s
This series is inspired by the IOMMU tracing code added by Shuah Khan
and a request to report some of those traces for vfio-based device
assignment. What I saw in the trace was an absurd number of calls to
iommu_unmap(). In fact, I had to up the trace log buffer size several
times before I was ac
We currently map invalid and reserved pages, such as often occur from
mapping MMIO regions of a VM through the IOMMU, using single pages.
There's really no reason we can't instead follow the methodology we
use for normal pages and find the largest possible physically
contiguous chunk for mapping.
When unmapping DMA entries we try to rely on the IOMMU API behavior
that allows the IOMMU to unmap a larger area than requested, up to
the size of the original mapping. This works great when the IOMMU
supports superpages *and* they're in use. Otherwise, each PAGE_SIZE
increment is unmapped separa
On Thu, Jan 15, 2015 at 08:30:06AM +, Thierry Reding wrote:
> On Wed, Jan 14, 2015 at 07:17:50PM +, Will Deacon wrote:
> > On Wed, Jan 14, 2015 at 01:51:36PM +, Heiko Stübner wrote:
> > > As Alexandre suspected the new Rockchip drm code seems to be affected by
> > > this. I hadn't playe
On Thu, Jan 15, 2015 at 08:28:44AM +, Thierry Reding wrote:
> On Wed, Jan 14, 2015 at 10:46:10AM +, Will Deacon wrote:
> > On Wed, Jan 14, 2015 at 09:00:24AM +, Alexandre Courbot wrote:
> [...]
> > > 2) Say you want to use the IOMMU API in your driver, and have an iommu
> > > property
On Wed, Jan 14, 2015 at 07:42:53PM +, Mitchel Humpherys wrote:
> On Tue, Dec 16 2014 at 01:45:27 AM, Will Deacon wrote:
> > On Mon, Dec 15, 2014 at 11:47:23PM +, Mitchel Humpherys wrote:
> >> From: Matt Wagantall
> >>
> >> It is sometimes necessary to poll a memory-mapped register until
On Wed, 7 Jan 2015, Jiang Liu wrote:
> Refine enable_IR_x2apic() and related functions for better readability.
>
> It also changes the way to handle IR in XAPIC mode when enabling X2APIC.
> Previously it just skips X2APIC initialization without checking max CPU
> APIC ID in system, which may caus
On Wed, Jan 14, 2015 at 07:17:50PM +, Will Deacon wrote:
> On Wed, Jan 14, 2015 at 01:51:36PM +, Heiko Stübner wrote:
> > Am Mittwoch, 14. Januar 2015, 10:46:10 schrieb Will Deacon:
> > > On Wed, Jan 14, 2015 at 09:00:24AM +, Alexandre Courbot wrote:
> > > > On 12/02/2014 01:57 AM, Will
On Wed, Jan 14, 2015 at 10:46:10AM +, Will Deacon wrote:
> On Wed, Jan 14, 2015 at 09:00:24AM +, Alexandre Courbot wrote:
[...]
> > 2) Say you want to use the IOMMU API in your driver, and have an iommu
> > property in your device's DT node. If by chance your IOMMU is registered
> > early
12 matches
Mail list logo
