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iommu: Add IOMMU index argument to notifier APIs

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Add support for multiple IOMMU indexes to the IOMMU notifier APIs.
When initializing a notifier with iommu_notifier_init(), the caller
must pass the IOMMU index that it is interested in. When a change
happens, the IOMMU implementation must pass
memory_region_notify_iommu() the IOMMU index that has changed and
that notifiers must be called for.

IOMMUs which support only a single index don't need to change.
Callers which only really support working with IOMMUs with a single
index can use the result of passing MEMTXATTRS_UNSPECIFIED to
memory_region_iommu_attrs_to_index().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20180604152941.20374-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-06-15 14:57:16 +01:00
parent 21f402093c
commit cb1efcf462
7 changed files with 30 additions and 10 deletions
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8
memory.c
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@ -1799,6 +1799,9 @@ void memory_region_register_iommu_notifier(MemoryRegion *mr,
iommu_mr = IOMMU_MEMORY_REGION(mr);
assert(n->notifier_flags != IOMMU_NOTIFIER_NONE);
assert(n->start <= n->end);
assert(n->iommu_idx >= 0 &&
n->iommu_idx < memory_region_iommu_num_indexes(iommu_mr));
QLIST_INSERT_HEAD(&iommu_mr->iommu_notify, n, node);
memory_region_update_iommu_notify_flags(iommu_mr);
}
@ -1891,6 +1894,7 @@ void memory_region_notify_one(IOMMUNotifier *notifier,
}
void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
int iommu_idx,
IOMMUTLBEntry entry)
{
IOMMUNotifier *iommu_notifier;
@ -1898,7 +1902,9 @@ void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
assert(memory_region_is_iommu(MEMORY_REGION(iommu_mr)));
IOMMU_NOTIFIER_FOREACH(iommu_notifier, iommu_mr) {
memory_region_notify_one(iommu_notifier, &entry);
if (iommu_notifier->iommu_idx == iommu_idx) {
memory_region_notify_one(iommu_notifier, &entry);
}
}
}