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| author | David Woodhouse <dwmw2@infradead.org> | 2016-09-12 10:49:11 +0800 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2016-11-19 09:42:35 -0800 |
| commit | 910170442944e1f8674fd5ddbeeb8ccd1877ea98 (patch) | |
| tree | 0d3b866ec62df63888e0c747e724ccd6f4b6efdf /include/linux/intel-iommu.h | |
| parent | 1c387188c60f53b338c20eee32db055dfe022a9b (diff) | |
| download | linux-910170442944e1f8674fd5ddbeeb8ccd1877ea98.tar.gz linux-910170442944e1f8674fd5ddbeeb8ccd1877ea98.tar.xz | |
iommu/vt-d: Fix PASID table allocation
Somehow I ended up with an off-by-three error in calculating the size of
the PASID and PASID State tables, which triggers allocations failures as
those tables unfortunately have to be physically contiguous.
In fact, even the *correct* maximum size of 8MiB is problematic and is
wont to lead to allocation failures. Since I have extracted a promise
that this *will* be fixed in hardware, I'm happy to limit it on the
current hardware to a maximum of 0x20000 PASIDs, which gives us 1MiB
tables — still not ideal, but better than before.
Reported by Mika Kuoppala <mika.kuoppala@linux.intel.com> and also by
Xunlei Pang <xlpang@redhat.com> who submitted a simpler patch to fix
only the allocation (and not the free) to the "correct" limit... which
was still problematic.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'include/linux/intel-iommu.h')
| -rw-r--r-- | include/linux/intel-iommu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 2d9b650047a5..d49e26c6cdc7 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -429,6 +429,7 @@ struct intel_iommu { struct page_req_dsc *prq; unsigned char prq_name[16]; /* Name for PRQ interrupt */ struct idr pasid_idr; + u32 pasid_max; #endif struct q_inval *qi; /* Queued invalidation info */ u32 *iommu_state; /* Store iommu states between suspend and resume.*/ |