Commit dbba197e authored Nov 30, 2018 by Joerg Roedel

driver core: Introduce device_iommu_mapped() function



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>

parent db5d6a70

include/linux/device.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -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>