dma-mapping fixes for Linux 6.12

- sort out a few issues with the direct calls to iommu-dma
    (Christoph Hellwig, Leon Romanovsky)
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Merge tag 'dma-mapping-6.12-2024-09-24' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:

 - sort out a few issues with the direct calls to iommu-dma (Christoph
   Hellwig, Leon Romanovsky)

* tag 'dma-mapping-6.12-2024-09-24' of git://git.infradead.org/users/hch/dma-mapping:
  dma-mapping: report unlimited DMA addressing in IOMMU DMA path
  iommu/dma: remove most stubs in iommu-dma.h
  dma-mapping: fix vmap and mmap of noncontiougs allocations

drivers/iommu/dma-iommu.c

@@ -1038,6 +1038,21 @@ out_unmap:
 	return NULL;
 }
 
+/*
+ * This is the actual return value from the iommu_dma_alloc_noncontiguous.
+ *
+ * The users of the DMA API should only care about the sg_table, but to make
+ * the DMA-API internal vmaping and freeing easier we stash away the page
+ * array as well (except for the fallback case).  This can go away any time,
+ * e.g. when a vmap-variant that takes a scatterlist comes along.
+ */
+struct dma_sgt_handle {
+	struct sg_table sgt;
+	struct page **pages;
+};
+#define sgt_handle(sgt) \
+	container_of((sgt), struct dma_sgt_handle, sgt)
+
 struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
 	       enum dma_data_direction dir, gfp_t gfp, unsigned long attrs)
 {
@@ -1066,6 +1081,24 @@ void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
 	kfree(sh);
 }
 
+void *iommu_dma_vmap_noncontiguous(struct device *dev, size_t size,
+		struct sg_table *sgt)
+{
+	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+	return vmap(sgt_handle(sgt)->pages, count, VM_MAP, PAGE_KERNEL);
+}
+
+int iommu_dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
+		size_t size, struct sg_table *sgt)
+{
+	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+	if (vma->vm_pgoff >= count || vma_pages(vma) > count - vma->vm_pgoff)
+		return -ENXIO;
+	return vm_map_pages(vma, sgt_handle(sgt)->pages, count);
+}
+
 void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 		size_t size, enum dma_data_direction dir)
 {

include/linux/dma-map-ops.h

@@ -24,11 +24,6 @@ struct dma_map_ops {
 			gfp_t gfp);
 	void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
 			dma_addr_t dma_handle, enum dma_data_direction dir);
-	struct sg_table *(*alloc_noncontiguous)(struct device *dev, size_t size,
-			enum dma_data_direction dir, gfp_t gfp,
-			unsigned long attrs);
-	void (*free_noncontiguous)(struct device *dev, size_t size,
-			struct sg_table *sgt, enum dma_data_direction dir);
 	int (*mmap)(struct device *, struct vm_area_struct *,
 			void *, dma_addr_t, size_t, unsigned long attrs);
 
@@ -206,20 +201,6 @@ static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma,
 }
 #endif /* CONFIG_DMA_GLOBAL_POOL */
 
-/*
- * This is the actual return value from the ->alloc_noncontiguous method.
- * The users of the DMA API should only care about the sg_table, but to make
- * the DMA-API internal vmaping and freeing easier we stash away the page
- * array as well (except for the fallback case).  This can go away any time,
- * e.g. when a vmap-variant that takes a scatterlist comes along.
- */
-struct dma_sgt_handle {
-	struct sg_table sgt;
-	struct page **pages;
-};
-#define sgt_handle(sgt) \
-	container_of((sgt), struct dma_sgt_handle, sgt)
-
 int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 		void *cpu_addr, dma_addr_t dma_addr, size_t size,
 		unsigned long attrs);

include/linux/iommu-dma.h

@@ -14,6 +14,13 @@ static inline bool use_dma_iommu(struct device *dev)
 {
 	return dev->dma_iommu;
 }
+#else
+static inline bool use_dma_iommu(struct device *dev)
+{
+	return false;
+}
+#endif /* CONFIG_IOMMU_DMA */
+
 dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
 		unsigned long offset, size_t size, enum dma_data_direction dir,
 		unsigned long attrs);
@@ -44,6 +51,12 @@ struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
 		enum dma_data_direction dir, gfp_t gfp, unsigned long attrs);
 void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
 		struct sg_table *sgt, enum dma_data_direction dir);
+void *iommu_dma_vmap_noncontiguous(struct device *dev, size_t size,
+		struct sg_table *sgt);
+#define iommu_dma_vunmap_noncontiguous(dev, vaddr) \
+	vunmap(vaddr);
+int iommu_dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
+		size_t size, struct sg_table *sgt);
 void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 		size_t size, enum dma_data_direction dir);
 void iommu_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
@@ -52,104 +65,5 @@ void iommu_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
 		int nelems, enum dma_data_direction dir);
 void iommu_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
 		int nelems, enum dma_data_direction dir);
-#else
+
-static inline bool use_dma_iommu(struct device *dev)
-{
-	return false;
-}
-static inline dma_addr_t iommu_dma_map_page(struct device *dev,
-		struct page *page, unsigned long offset, size_t size,
-		enum dma_data_direction dir, unsigned long attrs)
-{
-	return DMA_MAPPING_ERROR;
-}
-static inline void iommu_dma_unmap_page(struct device *dev,
-		dma_addr_t dma_handle, size_t size, enum dma_data_direction dir,
-		unsigned long attrs)
-{
-}
-static inline int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
-		int nents, enum dma_data_direction dir, unsigned long attrs)
-{
-	return -EINVAL;
-}
-static inline void iommu_dma_unmap_sg(struct device *dev,
-		struct scatterlist *sg, int nents, enum dma_data_direction dir,
-		unsigned long attrs)
-{
-}
-static inline void *iommu_dma_alloc(struct device *dev, size_t size,
-		dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
-{
-	return NULL;
-}
-static inline int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
-		void *cpu_addr, dma_addr_t dma_addr, size_t size,
-		unsigned long attrs)
-{
-	return -EINVAL;
-}
-static inline int iommu_dma_get_sgtable(struct device *dev,
-		struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr,
-		size_t size, unsigned long attrs)
-{
-	return -EINVAL;
-}
-static inline unsigned long iommu_dma_get_merge_boundary(struct device *dev)
-{
-	return 0;
-}
-static inline size_t iommu_dma_opt_mapping_size(void)
-{
-	return 0;
-}
-static inline size_t iommu_dma_max_mapping_size(struct device *dev)
-{
-	return 0;
-}
-static inline void iommu_dma_free(struct device *dev, size_t size,
-		void *cpu_addr, dma_addr_t handle, unsigned long attrs)
-{
-}
-static inline dma_addr_t iommu_dma_map_resource(struct device *dev,
-		phys_addr_t phys, size_t size, enum dma_data_direction dir,
-		unsigned long attrs)
-{
-	return DMA_MAPPING_ERROR;
-}
-static inline void iommu_dma_unmap_resource(struct device *dev,
-		dma_addr_t handle, size_t size, enum dma_data_direction dir,
-		unsigned long attrs)
-{
-}
-static inline struct sg_table *
-iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
-		enum dma_data_direction dir, gfp_t gfp, unsigned long attrs)
-{
-	return NULL;
-}
-static inline void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
-		struct sg_table *sgt, enum dma_data_direction dir)
-{
-}
-static inline void iommu_dma_sync_single_for_cpu(struct device *dev,
-		dma_addr_t dma_handle, size_t size,
-		enum dma_data_direction dir)
-{
-}
-static inline void iommu_dma_sync_single_for_device(struct device *dev,
-		dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
-{
-}
-static inline void iommu_dma_sync_sg_for_cpu(struct device *dev,
-		struct scatterlist *sgl, int nelems,
-		enum dma_data_direction dir)
-{
-}
-static inline void iommu_dma_sync_sg_for_device(struct device *dev,
-		struct scatterlist *sgl, int nelems,
-		enum dma_data_direction dir)
-{
-}
-#endif /* CONFIG_IOMMU_DMA */
 #endif /* _LINUX_IOMMU_DMA_H */

kernel/dma/mapping.c

@@ -569,6 +569,10 @@ u64 dma_get_required_mask(struct device *dev)
 
 	if (dma_alloc_direct(dev, ops))
 		return dma_direct_get_required_mask(dev);
+
+	if (use_dma_iommu(dev))
+		return DMA_BIT_MASK(32);
+
 	if (ops->get_required_mask)
 		return ops->get_required_mask(dev);
 
@@ -750,7 +754,6 @@ out_free_sgt:
 struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size,
 		enum dma_data_direction dir, gfp_t gfp, unsigned long attrs)
 {
-	const struct dma_map_ops *ops = get_dma_ops(dev);
 	struct sg_table *sgt;
 
 	if (WARN_ON_ONCE(attrs & ~DMA_ATTR_ALLOC_SINGLE_PAGES))
@@ -758,9 +761,7 @@ struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size,
 	if (WARN_ON_ONCE(gfp & __GFP_COMP))
 		return NULL;
 
-	if (ops && ops->alloc_noncontiguous)
+	if (use_dma_iommu(dev))
-		sgt = ops->alloc_noncontiguous(dev, size, dir, gfp, attrs);
-	else if (use_dma_iommu(dev))
 		sgt = iommu_dma_alloc_noncontiguous(dev, size, dir, gfp, attrs);
 	else
 		sgt = alloc_single_sgt(dev, size, dir, gfp);
@@ -786,13 +787,10 @@ static void free_single_sgt(struct device *dev, size_t size,
 void dma_free_noncontiguous(struct device *dev, size_t size,
 		struct sg_table *sgt, enum dma_data_direction dir)
 {
-	const struct dma_map_ops *ops = get_dma_ops(dev);
-
 	trace_dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir, 0);
 	debug_dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir);
-	if (ops && ops->free_noncontiguous)
+
-		ops->free_noncontiguous(dev, size, sgt, dir);
+	if (use_dma_iommu(dev))
-	else if (use_dma_iommu(dev))
 		iommu_dma_free_noncontiguous(dev, size, sgt, dir);
 	else
 		free_single_sgt(dev, size, sgt, dir);
@@ -802,37 +800,26 @@ EXPORT_SYMBOL_GPL(dma_free_noncontiguous);
 void *dma_vmap_noncontiguous(struct device *dev, size_t size,
 		struct sg_table *sgt)
 {
-	const struct dma_map_ops *ops = get_dma_ops(dev);
-	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
 
-	if (ops && ops->alloc_noncontiguous)
+	if (use_dma_iommu(dev))
-		return vmap(sgt_handle(sgt)->pages, count, VM_MAP, PAGE_KERNEL);
+		return iommu_dma_vmap_noncontiguous(dev, size, sgt);
+
 	return page_address(sg_page(sgt->sgl));
 }
 EXPORT_SYMBOL_GPL(dma_vmap_noncontiguous);
 
 void dma_vunmap_noncontiguous(struct device *dev, void *vaddr)
 {
-	const struct dma_map_ops *ops = get_dma_ops(dev);
+	if (use_dma_iommu(dev))
-
+		iommu_dma_vunmap_noncontiguous(dev, vaddr);
-	if (ops && ops->alloc_noncontiguous)
-		vunmap(vaddr);
 }
 EXPORT_SYMBOL_GPL(dma_vunmap_noncontiguous);
 
 int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
 		size_t size, struct sg_table *sgt)
 {
-	const struct dma_map_ops *ops = get_dma_ops(dev);
+	if (use_dma_iommu(dev))
-
+		return iommu_dma_mmap_noncontiguous(dev, vma, size, sgt);
-	if (ops && ops->alloc_noncontiguous) {
-		unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-
-		if (vma->vm_pgoff >= count ||
-		    vma_pages(vma) > count - vma->vm_pgoff)
-			return -ENXIO;
-		return vm_map_pages(vma, sgt_handle(sgt)->pages, count);
-	}
 	return dma_mmap_pages(dev, vma, size, sg_page(sgt->sgl));
 }
 EXPORT_SYMBOL_GPL(dma_mmap_noncontiguous);
@@ -926,7 +913,7 @@ bool dma_addressing_limited(struct device *dev)
 			 dma_get_required_mask(dev))
 		return true;
 
-	if (unlikely(ops))
+	if (unlikely(ops) || use_dma_iommu(dev))
 		return false;
 	return !dma_direct_all_ram_mapped(dev);
 }