Displaying 3 results from an estimated 3 matches for "iommu_domain_identify".
2019 Sep 16
1
[PATCH 08/11] drm/nouveau: tegra: Skip IOMMU initialization if already attached
...bly want to
>> double-check the domain type as well.
>
> Good point. An earlier version of this patch had an additional check for
> IOMMU_DOMAIN_DMA, but then that failed on 32-bit ARM because there the
> DMA API can also use IOMMU_DOMAIN_UNMANAGED type domains. Checking for
> IOMMU_DOMAIN_IDENTIFY should be safe, though. That doesn't seem to
> appear in arch/arm, arch/arm64 or drivers/iommu/dma-iommu.c.
Right, "domain && domain->type != IOMMU_DOMAIN_IDENTITY" should be
sufficient to answer "is the DMA layer managing my address space for
me?" unless an...
2019 Sep 16
2
[PATCH 08/11] drm/nouveau: tegra: Skip IOMMU initialization if already attached
Hi Thierry,
On 16/09/2019 16:04, Thierry Reding wrote:
> From: Thierry Reding <treding at nvidia.com>
>
> If the GPU is already attached to an IOMMU, don't detach it and setup an
> explicit IOMMU domain. Since Nouveau can now properly handle the case of
> the DMA API being backed by an IOMMU, just continue using the DMA API.
>
> Signed-off-by: Thierry Reding
2019 Sep 16
0
[PATCH 08/11] drm/nouveau: tegra: Skip IOMMU initialization if already attached
...LB DMA ops. I guess you probably want to
> double-check the domain type as well.
Good point. An earlier version of this patch had an additional check for
IOMMU_DOMAIN_DMA, but then that failed on 32-bit ARM because there the
DMA API can also use IOMMU_DOMAIN_UNMANAGED type domains. Checking for
IOMMU_DOMAIN_IDENTIFY should be safe, though. That doesn't seem to
appear in arch/arm, arch/arm64 or drivers/iommu/dma-iommu.c.
Thierry
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <https...