iommu/vt-d: Remove unused domain_alloc callback

With domain_alloc_paging callback supported, the legacy domain_alloc
callback will never be used anymore. Remove it to avoid dead code.

Signed-off-by: Lu Baolu <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: LuBaolu

drivers/iommu/intel/iommu.c

@@ -1454,27 +1454,6 @@ static bool first_level_by_default(unsigned int type)
 	return type != IOMMU_DOMAIN_UNMANAGED;
 }
 
-static struct dmar_domain *alloc_domain(unsigned int type)
-{
-	struct dmar_domain *domain;
-
-	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
-	if (!domain)
-		return NULL;
-
-	domain->nid = NUMA_NO_NODE;
-	if (first_level_by_default(type))
-		domain->use_first_level = true;
-	INIT_LIST_HEAD(&domain->devices);
-	INIT_LIST_HEAD(&domain->dev_pasids);
-	INIT_LIST_HEAD(&domain->cache_tags);
-	spin_lock_init(&domain->lock);
-	spin_lock_init(&domain->cache_lock);
-	xa_init(&domain->iommu_array);
-
-	return domain;
-}
-
 int domain_attach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu)
 {
 	struct iommu_domain_info *info, *curr;
@@ -1546,20 +1525,6 @@ void domain_detach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu)
 	spin_unlock(&iommu->lock);
 }
 
-static int guestwidth_to_adjustwidth(int gaw)
-{
-	int agaw;
-	int r = (gaw - 12) % 9;
-
-	if (r == 0)
-		agaw = gaw;
-	else
-		agaw = gaw + 9 - r;
-	if (agaw > 64)
-		agaw = 64;
-	return agaw;
-}
-
 static void domain_exit(struct dmar_domain *domain)
 {
 	if (domain->pgd) {
@@ -3379,27 +3344,6 @@ void device_block_translation(struct device *dev)
 	info->domain = NULL;
 }
 
-static int md_domain_init(struct dmar_domain *domain, int guest_width)
-{
-	int adjust_width;
-
-	/* calculate AGAW */
-	domain->gaw = guest_width;
-	adjust_width = guestwidth_to_adjustwidth(guest_width);
-	domain->agaw = width_to_agaw(adjust_width);
-
-	domain->iommu_coherency = false;
-	domain->iommu_superpage = 0;
-	domain->max_addr = 0;
-
-	/* always allocate the top pgd */
-	domain->pgd = iommu_alloc_page_node(domain->nid, GFP_ATOMIC);
-	if (!domain->pgd)
-		return -ENOMEM;
-	domain_flush_cache(domain, domain->pgd, PAGE_SIZE);
-	return 0;
-}
-
 static int blocking_domain_attach_dev(struct iommu_domain *domain,
 				      struct device *dev)
 {
@@ -3486,39 +3430,6 @@ static struct dmar_domain *paging_domain_alloc(struct device *dev, bool first_st
 	return domain;
 }
 
-static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
-{
-	struct dmar_domain *dmar_domain;
-	struct iommu_domain *domain;
-
-	switch (type) {
-	case IOMMU_DOMAIN_DMA:
-	case IOMMU_DOMAIN_UNMANAGED:
-		dmar_domain = alloc_domain(type);
-		if (!dmar_domain) {
-			pr_err("Can't allocate dmar_domain\n");
-			return NULL;
-		}
-		if (md_domain_init(dmar_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) {
-			pr_err("Domain initialization failed\n");
-			domain_exit(dmar_domain);
-			return NULL;
-		}
-
-		domain = &dmar_domain->domain;
-		domain->geometry.aperture_start = 0;
-		domain->geometry.aperture_end   =
-				__DOMAIN_MAX_ADDR(dmar_domain->gaw);
-		domain->geometry.force_aperture = true;
-
-		return domain;
-	default:
-		return NULL;
-	}
-
-	return NULL;
-}
-
 static struct iommu_domain *
 intel_iommu_domain_alloc_user(struct device *dev, u32 flags,
 			      struct iommu_domain *parent,
@@ -4609,7 +4520,6 @@ const struct iommu_ops intel_iommu_ops = {
 	.identity_domain	= &identity_domain,
 	.capable		= intel_iommu_capable,
 	.hw_info		= intel_iommu_hw_info,
-	.domain_alloc		= intel_iommu_domain_alloc,
 	.domain_alloc_user	= intel_iommu_domain_alloc_user,
 	.domain_alloc_sva	= intel_svm_domain_alloc,
 	.domain_alloc_paging	= intel_iommu_domain_alloc_paging,