Merge branch 'perf/core' into perf/uprobes

Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 88 insertions, 11 deletions

diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index f8ac076afa5..3efbfc2145c 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -26,11 +26,12 @@
 
 #include <linux/file.h>
 #include <linux/err.h>
-#include <linux/device.h>
 #include <linux/scatterlist.h>
 #include <linux/list.h>
 #include <linux/dma-mapping.h>
+#include <linux/fs.h>
 
+struct device;
 struct dma_buf;
 struct dma_buf_attachment;
 
@@ -49,6 +50,17 @@ struct dma_buf_attachment;
  * @unmap_dma_buf: decreases usecount of buffer, might deallocate scatter
  *		   pages.
  * @release: release this buffer; to be called after the last dma_buf_put.
+ * @begin_cpu_access: [optional] called before cpu access to invalidate cpu
+ * 		      caches and allocate backing storage (if not yet done)
+ * 		      respectively pin the objet into memory.
+ * @end_cpu_access: [optional] called after cpu access to flush cashes.
+ * @kmap_atomic: maps a page from the buffer into kernel address
+ * 		 space, users may not block until the subsequent unmap call.
+ * 		 This callback must not sleep.
+ * @kunmap_atomic: [optional] unmaps a atomically mapped page from the buffer.
+ * 		   This Callback must not sleep.
+ * @kmap: maps a page from the buffer into kernel address space.
+ * @kunmap: [optional] unmaps a page from the buffer.
  */
 struct dma_buf_ops {
 	int (*attach)(struct dma_buf *, struct device *,
@@ -63,7 +75,8 @@ struct dma_buf_ops {
 	struct sg_table * (*map_dma_buf)(struct dma_buf_attachment *,
 						enum dma_data_direction);
 	void (*unmap_dma_buf)(struct dma_buf_attachment *,
-						struct sg_table *);
+						struct sg_table *,
+						enum dma_data_direction);
 	/* TODO: Add try_map_dma_buf version, to return immed with -EBUSY
 	 * if the call would block.
 	 */
@@ -71,6 +84,14 @@ struct dma_buf_ops {
 	/* after final dma_buf_put() */
 	void (*release)(struct dma_buf *);
 
+	int (*begin_cpu_access)(struct dma_buf *, size_t, size_t,
+				enum dma_data_direction);
+	void (*end_cpu_access)(struct dma_buf *, size_t, size_t,
+			       enum dma_data_direction);
+	void *(*kmap_atomic)(struct dma_buf *, unsigned long);
+	void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
+	void *(*kmap)(struct dma_buf *, unsigned long);
+	void (*kunmap)(struct dma_buf *, unsigned long, void *);
 };
 
 /**
@@ -86,7 +107,7 @@ struct dma_buf {
 	struct file *file;
 	struct list_head attachments;
 	const struct dma_buf_ops *ops;
-	/* mutex to serialize list manipulation and other ops */
+	/* mutex to serialize list manipulation and attach/detach */
 	struct mutex lock;
 	void *priv;
 };
@@ -109,20 +130,43 @@ struct dma_buf_attachment {
 	void *priv;
 };
 
+/**
+ * get_dma_buf - convenience wrapper for get_file.
+ * @dmabuf:	[in]	pointer to dma_buf
+ *
+ * Increments the reference count on the dma-buf, needed in case of drivers
+ * that either need to create additional references to the dmabuf on the
+ * kernel side.  For example, an exporter that needs to keep a dmabuf ptr
+ * so that subsequent exports don't create a new dmabuf.
+ */
+static inline void get_dma_buf(struct dma_buf *dmabuf)
+{
+	get_file(dmabuf->file);
+}
+
 #ifdef CONFIG_DMA_SHARED_BUFFER
 struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
 							struct device *dev);
 void dma_buf_detach(struct dma_buf *dmabuf,
 				struct dma_buf_attachment *dmabuf_attach);
-struct dma_buf *dma_buf_export(void *priv, struct dma_buf_ops *ops,
-			size_t size, int flags);
-int dma_buf_fd(struct dma_buf *dmabuf);
+struct dma_buf *dma_buf_export(void *priv, const struct dma_buf_ops *ops,
+			       size_t size, int flags);
+int dma_buf_fd(struct dma_buf *dmabuf, int flags);
 struct dma_buf *dma_buf_get(int fd);
 void dma_buf_put(struct dma_buf *dmabuf);
 
 struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *,
 					enum dma_data_direction);
-void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *);
+void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
+				enum dma_data_direction);
+int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
+			     enum dma_data_direction dir);
+void dma_buf_end_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
+			    enum dma_data_direction dir);
+void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long);
+void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long, void *);
+void *dma_buf_kmap(struct dma_buf *, unsigned long);
+void dma_buf_kunmap(struct dma_buf *, unsigned long, void *);
 #else
 
 static inline struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
@@ -138,13 +182,13 @@ static inline void dma_buf_detach(struct dma_buf *dmabuf,
 }
 
 static inline struct dma_buf *dma_buf_export(void *priv,
-						struct dma_buf_ops *ops,
-						size_t size, int flags)
+					     const struct dma_buf_ops *ops,
+					     size_t size, int flags)
 {
 	return ERR_PTR(-ENODEV);
 }
 
-static inline int dma_buf_fd(struct dma_buf *dmabuf)
+static inline int dma_buf_fd(struct dma_buf *dmabuf, int flags)
 {
 	return -ENODEV;
 }
@@ -166,11 +210,44 @@ static inline struct sg_table *dma_buf_map_attachment(
 }
 
 static inline void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
-						struct sg_table *sg)
+			struct sg_table *sg, enum dma_data_direction dir)
 {
 	return;
 }
 
+static inline int dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
+					   size_t start, size_t len,
+					   enum dma_data_direction dir)
+{
+	return -ENODEV;
+}
+
+static inline void dma_buf_end_cpu_access(struct dma_buf *dmabuf,
+					  size_t start, size_t len,
+					  enum dma_data_direction dir)
+{
+}
+
+static inline void *dma_buf_kmap_atomic(struct dma_buf *dmabuf,
+					unsigned long pnum)
+{
+	return NULL;
+}
+
+static inline void dma_buf_kunmap_atomic(struct dma_buf *dmabuf,
+					 unsigned long pnum, void *vaddr)
+{
+}
+
+static inline void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long pnum)
+{
+	return NULL;
+}
+
+static inline void dma_buf_kunmap(struct dma_buf *dmabuf,
+				  unsigned long pnum, void *vaddr)
+{
+}
 #endif /* CONFIG_DMA_SHARED_BUFFER */
 
 #endif /* __DMA_BUF_H__ */