[PATCH v3 20/21] iommu: Remove iommu_present()

Lu Baolu
2024-06-10T09:00:01Z

The iommu_present() interface is no longer used in the tree anymore.
Remove it to avoid dead code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
include/linux/iommu.h | 6 ------
drivers/iommu/iommu.c | 25 -------------------------
2 files changed, 31 deletions(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 46f1348f1f0a..ba0b27afc256 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -776,7 +776,6 @@ 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);
@@ -1072,11 +1071,6 @@ 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;
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index e03c71a34347..c7ebdf96e4bc 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1846,31 +1846,6 @@ 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
--
2.34.1