Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH 1/6] driver core: Introduce device_iommu_mapped() function | Date | Tue, 11 Dec 2018 14:43:38 +0100 |
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From: Joerg Roedel <jroedel@suse.de>
Some places in the kernel check the iommu_group pointer in 'struct device' in order to find ot whether a device is mapped by an IOMMU.
This is not good way to make this check, as the pointer will be moved to 'struct dev_iommu_data'. This way to make the check is also not very readable.
Introduce an explicit function to perform this check.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de> --- include/linux/device.h | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/include/linux/device.h b/include/linux/device.h index 1b25c7a43f4c..6cb4640b6160 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1058,6 +1058,16 @@ static inline struct device *kobj_to_dev(struct kobject *kobj) return container_of(kobj, struct device, kobj); } +/** + * device_iommu_mapped - Returns true when the device DMA is translated + * by an IOMMU + * @dev: Device to perform the check on + */ +static inline bool device_iommu_mapped(struct device *dev) +{ + return (dev->iommu_group != NULL); +} + /* Get the wakeup routines, which depend on struct device */ #include <linux/pm_wakeup.h> -- 2.17.1
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