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| author |   Robin Murphy <robin.murphy@arm.com> | 2016-11-11 17:59:21 +0000 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2016-11-15 12:25:33 +0100 |
| commit | 13f59a78c6d69a9bf4c8989dd5f3396f54a2fe41 (patch) | |
| tree | 6faca25c8154692b8d0b564522cb0834e3c7e8ad /include/linux/iommu.h | |
| parent | arm64: Wire up iommu_dma_{map, unmap}_resource() (diff) | |
| download | wireguard-linux-13f59a78c6d69a9bf4c8989dd5f3396f54a2fe41.tar.xz wireguard-linux-13f59a78c6d69a9bf4c8989dd5f3396f54a2fe41.zip | |
iommu: Allow taking a reference on a group directly
iommu_group_get_for_dev() expects that the IOMMU driver's device_group
callback return a group with a reference held for the given device.
Whilst allocating a new group is fine, and pci_device_group() correctly
handles reusing an existing group, there is no general means for IOMMU
drivers doing their own group lookup to take additional references on an
existing group pointer without having to also store device pointers or
resort to elaborate trickery.
Add an IOMMU-driver-specific function to fill the hole.
Acked-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 436dc21318af..431638110c6a 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -253,6 +253,7 @@ extern void iommu_group_remove_device(struct device *dev); extern int iommu_group_for_each_dev(struct iommu_group *group, void *data, int (*fn)(struct device *, void *)); extern struct iommu_group *iommu_group_get(struct device *dev); +extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group); extern void iommu_group_put(struct iommu_group *group); extern int iommu_group_register_notifier(struct iommu_group *group, struct notifier_block *nb); |