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Groups > linux.kernel > #1521826
| From | Joerg Roedel <joro@8bytes.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC v2 8/8] iommu/arm-smmu: implement add_reserved_regions callback |
| Date | 2016-11-14 17:30 +0100 |
| Message-ID | <sDsiR-Vh-29@gated-at.bofh.it> (permalink) |
| References | (5 earlier) <sCmfv-68Q-1@gated-at.bofh.it> <sCmSd-6F5-1@gated-at.bofh.it> <sCnbz-6LA-1@gated-at.bofh.it> <sDrwu-l5-21@gated-at.bofh.it> <sDrZw-Nx-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Nov 14, 2016 at 05:08:16PM +0100, Auger Eric wrote: > There are potentially several MSI doorbell physical pages in the SOC > that are accessed through the IOMMU (translated). Each of those must > have a corresponding IOVA and IOVA/PA mapping programmed in the IOMMU. > Else MSI will fault. > > - step 1 was to define a usable IOVA range for MSI mapping. So now we > decided the base address and size would be hardcoded for ARM. The > get_dm_region can be used to retrieve that hardcoded region. > - Step2 is to allocate IOVAs within that range and map then for each of > those MSI doorbells. This is done in the MSI controller compose() callback. > > I hope I succeeded in clarifying this time. > > Robin sent today a new version of its cookie think using a dummy > allocator. I am currently integrating it. Okay, I understand. A simple bitmap-allocator would probably be sufficient, and doesn't have the overhead the iova allocator has. About how many pages are we talking here? Joerg
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Re: [RFC v2 8/8] iommu/arm-smmu: implement add_reserved_regions callback Joerg Roedel <joro@8bytes.org> - 2016-11-14 16:40 +0100
Re: [RFC v2 8/8] iommu/arm-smmu: implement add_reserved_regions callback Auger Eric <eric.auger@redhat.com> - 2016-11-14 17:10 +0100
Re: [RFC v2 8/8] iommu/arm-smmu: implement add_reserved_regions callback Joerg Roedel <joro@8bytes.org> - 2016-11-14 17:30 +0100
Re: [RFC v2 8/8] iommu/arm-smmu: implement add_reserved_regions callback Auger Eric <eric.auger@redhat.com> - 2016-11-14 18:00 +0100
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