ib_umem: Add a new, more generic ib_umem_get_attrs

This call allows a full range of DMA attributes and also
DMA direction to be supplied and is just a refactor of the old ib_umem_get.
Reimplement ib_umem_get using the new generic call,
now a trivial implementation.

Orabug: 20930262

Signed-off-by: Knut Omang <[email protected]>
Signed-off-by: Mukesh Kacker <[email protected]>

Author: Knut Omang

drivers/infiniband/core/umem.c

@@ -53,7 +53,7 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d
 	if (umem->nmap > 0)
 		ib_dma_unmap_sg(dev, umem->sg_head.sgl,
 				umem->nmap,
-				DMA_BIDIRECTIONAL);
+				umem->dir);
 
 	for_each_sg(umem->sg_head.sgl, sg, umem->npages, i) {
 
@@ -82,6 +82,17 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d
  */
 struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 			    size_t size, int access, int dmasync)
+{
+	DEFINE_DMA_ATTRS(attrs);
+	if (dmasync)
+		dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs);
+	return ib_umem_get_attrs(context, addr, size, access, DMA_BIDIRECTIONAL, &attrs);
+}
+EXPORT_SYMBOL(ib_umem_get);
+
+struct ib_umem *ib_umem_get_attrs(struct ib_ucontext *context, unsigned long addr,
+				  size_t size, int access, enum dma_data_direction dir,
+				  struct dma_attrs *attrs)
 {
 	struct ib_umem *umem;
 	struct page **page_list;
@@ -92,13 +103,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 	unsigned long npages;
 	int ret;
 	int i;
-	DEFINE_DMA_ATTRS(attrs);
 	struct scatterlist *sg, *sg_list_start;
 	int need_release = 0;
 
-	if (dmasync)
-		dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs);
-
 	if (!size)
 		return ERR_PTR(-EINVAL);
 
@@ -122,6 +129,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 	umem->address   = addr;
 	umem->page_size = PAGE_SIZE;
 	umem->pid       = get_task_pid(current, PIDTYPE_PID);
+	umem->dir	= dir;
 	/*
 	 * We ask for writable memory if any of the following
 	 * access flags are set.  "Local write" and "remote write"
@@ -214,8 +222,8 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 	umem->nmap = ib_dma_map_sg_attrs(context->device,
 				  umem->sg_head.sgl,
 				  umem->npages,
-				  DMA_BIDIRECTIONAL,
-				  &attrs);
+				  dir,
+				  attrs);
 
 	if (umem->nmap <= 0) {
 		ret = -ENOMEM;
@@ -240,7 +248,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 
 	return ret < 0 ? ERR_PTR(ret) : umem;
 }
-EXPORT_SYMBOL(ib_umem_get);
+EXPORT_SYMBOL(ib_umem_get_attrs);
 
 static void ib_umem_account(struct work_struct *work)
 {

include/rdma/ib_umem.h

@@ -36,9 +36,11 @@
 #include <linux/list.h>
 #include <linux/scatterlist.h>
 #include <linux/workqueue.h>
+#include <linux/dma-direction.h>
 
 struct ib_ucontext;
 struct ib_umem_odp;
+struct dma_attrs;
 
 struct ib_umem {
 	struct ib_ucontext     *context;
@@ -47,6 +49,7 @@ struct ib_umem {
 	int			page_size;
 	int                     writable;
 	int                     hugetlb;
+	enum dma_data_direction dir;
 	struct work_struct	work;
 	struct pid             *pid;
 	struct mm_struct       *mm;
@@ -81,9 +84,12 @@ static inline size_t ib_umem_num_pages(struct ib_umem *umem)
 }
 
 #ifdef CONFIG_INFINIBAND_USER_MEM
-
 struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 			    size_t size, int access, int dmasync);
+struct ib_umem *ib_umem_get_attrs(struct ib_ucontext *context, unsigned long addr,
+				  size_t size, int access,
+				  enum dma_data_direction dir,
+				  struct dma_attrs *attrs);
 void ib_umem_release(struct ib_umem *umem);
 int ib_umem_page_count(struct ib_umem *umem);
 int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
@@ -98,6 +104,14 @@ static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
 					  int access, int dmasync) {
 	return ERR_PTR(-EINVAL);
 }
+static inline struct ib_umem *ib_umem_get_attrs(struct ib_ucontext *context,
+						unsigned long addr,
+						size_t size, int access,
+						enum dma_data_direction dir,
+						struct dma_attrs *attrs)
+{
+	return ERR_PTR(-EINVAL);
+}
 static inline void ib_umem_release(struct ib_umem *umem) { }
 static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
 static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,