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driver core: Introduce device_iommu_mapped() function

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Some places in the kernel check the iommu_group pointer in
'struct device' in order to find out 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.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2018-11-30 12:51:52 +01:00
parent db5d6a7004
commit dbba197edf
1 changed files with 10 additions and 0 deletions
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10
include/linux/device.h
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@ -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>