Commit 66328632 authored by Lu Baolu's avatar Lu Baolu Committed by Joerg Roedel
Browse files

iommu: Remove iommu_present() 



The last callsite of iommu_present() is removed by commit <45c690ae>
("drm/tegra: Use iommu_paging_domain_alloc()"). Remove it to avoid dead
code.

Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Reviewed-by: default avatarYi Liu <yi.l.liu@intel.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20241009051808.29455-1-baolu.lu@linux.intel.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 7fd9aeb0

drivers/iommu/iommu.c

+0 −25
Original line number Diff line number Diff line
@@ -1840,31 +1840,6 @@ int bus_iommu_probe(const struct bus_type *bus) 
	return 0;

}



/**

 * iommu_present() - make platform-specific assumptions about an IOMMU

 * @bus: bus to check

 *

 * Do not use this function. You want device_iommu_mapped() instead.

 *

 * Return: true if some IOMMU is present and aware of devices on the given bus;

 * in general it may not be the only IOMMU, and it may not have anything to do

 * with whatever device you are ultimately interested in.

 */

bool iommu_present(const struct bus_type *bus)

{

	bool ret = false;



	for (int i = 0; i < ARRAY_SIZE(iommu_buses); i++) {

		if (iommu_buses[i] == bus) {

			spin_lock(&iommu_device_lock);

			ret = !list_empty(&iommu_device_list);

			spin_unlock(&iommu_device_lock);

		}

	}

	return ret;

}

EXPORT_SYMBOL_GPL(iommu_present);



/**

 * device_iommu_capable() - check for a general IOMMU capability

 * @dev: device to which the capability would be relevant, if available

include/linux/iommu.h

+0 −6
Original line number Diff line number Diff line
@@ -785,7 +785,6 @@ static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather) 
}



extern int bus_iommu_probe(const struct bus_type *bus);

extern bool iommu_present(const struct bus_type *bus);

extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);

extern bool iommu_group_has_isolated_msi(struct iommu_group *group);

extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
@@ -1081,11 +1080,6 @@ struct iommu_iotlb_gather {}; 
struct iommu_dirty_bitmap {};

struct iommu_dirty_ops {};



static inline bool iommu_present(const struct bus_type *bus)

{

	return false;

}



static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)

{

	return false;