iommu/fsl_pamu: merge iommu_alloc_dma_domain into fsl_pamu_domain_alloc

Keep the functionality to allocate the domain together.

Signed-off-by: Christoph Hellwig <[e-mail]>
Acked-by: Will Deacon <[e-mail]>
Acked-by: Li Yang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Joerg Roedel <[e-mail]>

drivers/iommu/fsl_pamu_domain.c

···
 	return 0;
 }
 
-static struct fsl_dma_domain *iommu_alloc_dma_domain(void)
-{
-	struct fsl_dma_domain *domain;
-
-	domain = kmem_cache_zalloc(fsl_pamu_domain_cache, GFP_KERNEL);
-	if (!domain)
-		return NULL;
-
-	domain->stash_id = ~(u32)0;
-	domain->snoop_id = ~(u32)0;
-	domain->win_cnt = pamu_get_max_subwin_cnt();
-
-	INIT_LIST_HEAD(&domain->devices);
-
-	spin_lock_init(&domain->domain_lock);
-
-	return domain;
-}
-
 static void remove_device_ref(struct device_domain_info *info, u32 win_cnt)
 {
 	unsigned long flags;
···
 	if (type != IOMMU_DOMAIN_UNMANAGED)
 		return NULL;
 
-	dma_domain = iommu_alloc_dma_domain();
-	if (!dma_domain) {
-		pr_debug("dma_domain allocation failed\n");
+	dma_domain = kmem_cache_zalloc(fsl_pamu_domain_cache, GFP_KERNEL);
+	if (!dma_domain)
 		return NULL;
-	}
-	/* defaul geometry 64 GB i.e. maximum system address */
+
+	dma_domain->stash_id = ~(u32)0;
+	dma_domain->snoop_id = ~(u32)0;
+	dma_domain->win_cnt = pamu_get_max_subwin_cnt();
+	INIT_LIST_HEAD(&dma_domain->devices);
+	spin_lock_init(&dma_domain->domain_lock);
+
+	/* default geometry 64 GB i.e. maximum system address */
 	dma_domain->iommu_domain. geometry.aperture_start = 0;
 	dma_domain->iommu_domain.geometry.aperture_end = (1ULL << 36) - 1;
 	dma_domain->iommu_domain.geometry.force_aperture = true;