[PATCH v3 21/21] iommu: Remove iommu_domain_alloc()

Lu Baolu
2024-06-10T09:00:16Z

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

There is increasing demand for supporting multiple IOMMU drivers, and this
is the last bus-based thing standing in the way of that.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
include/linux/iommu.h | 6 ------
drivers/iommu/iommu.c | 36 ------------------------------------
2 files changed, 42 deletions(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index ba0b27afc256..bff6e7e81fa3 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -778,7 +778,6 @@ static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
extern int bus_iommu_probe(const struct bus_type *bus);
extern bool 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);
struct iommu_domain *iommu_paging_domain_alloc(struct device *dev);
extern void iommu_domain_free(struct iommu_domain *domain);
extern int iommu_attach_device(struct iommu_domain *domain,
@@ -1076,11 +1075,6 @@ static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
return false;
}

-static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
-{
- return NULL;
-}
-
static inline struct iommu_domain *iommu_paging_domain_alloc(struct device *dev)
{
return ERR_PTR(-ENODEV);
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index c7ebdf96e4bc..8212fed27e18 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1975,42 +1975,6 @@ __iommu_group_domain_alloc(struct iommu_group *group, unsigned int type)
return __iommu_domain_alloc(dev_iommu_ops(dev), dev, type);
}

-static int __iommu_domain_alloc_dev(struct device *dev, void *data)
-{
- const struct iommu_ops **ops = data;
-
- if (!dev_has_iommu(dev))
- return 0;
-
- if (WARN_ONCE(*ops && *ops != dev_iommu_ops(dev),
- "Multiple IOMMU drivers present for bus %s, which the public IOMMU API can't fully support yet. You will still need to disable one or more for this to work, sorry!\n",
- dev_bus_name(dev)))
- return -EBUSY;
-
- *ops = dev_iommu_ops(dev);
- return 0;
-}
-
-/*
- * The iommu ops in bus has been retired. Do not use this interface in
- * new drivers.
- */
-struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
-{
- const struct iommu_ops *ops = NULL;
- int err = bus_for_each_dev(bus, NULL, &ops, __iommu_domain_alloc_dev);
- struct iommu_domain *domain;
-
- if (err || !ops)
- return NULL;
-
- domain = __iommu_domain_alloc(ops, NULL, IOMMU_DOMAIN_UNMANAGED);
- if (IS_ERR(domain))
- return NULL;
- return domain;
-}
-EXPORT_SYMBOL_GPL(iommu_domain_alloc);
-
/**
* iommu_paging_domain_alloc() - Allocate a paging domain
* @dev: device for which the domain is allocated
--
2.34.1