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authorDaniel Vetter <daniel.vetter@ffwll.ch>2012-03-20 00:02:37 +0100
committerSumit Semwal <sumit.semwal@ti.com>2012-03-26 11:33:02 +0530
commitfc13020e086bfedf2afb95c91c026d5af1f80107 (patch)
treea06be5c3eff6865a42046b51270e4d60e30609f4 /include/linux/dma-buf.h
parent6b607e3a658fee490bdabfdeb739a3eb498b1bff (diff)
dma-buf: add support for kernel cpu access
Big differences to other contenders in the field (like ion) is that this also supports highmem, so we have to split up the cpu access from the kernel side into a prepare and a kmap step. Prepare is allowed to fail and should do everything required so that the kmap calls can succeed (like swapin/backing storage allocation, flushing, ...). More in-depth explanations will follow in the follow-up documentation patch. Changes in v2: - Clear up begin_cpu_access confusion noticed by Sumit Semwal. - Don't automatically fallback from the _atomic variants to the non-atomic variants. The _atomic callbacks are not allowed to sleep, so we want exporters to make this decision explicit. The function signatures are explicit, so simpler exporters can still use the same function for both. - Make the unmap functions optional. Simpler exporters with permanent mappings don't need to do anything at unmap time. Changes in v3: - Adjust the WARN_ON checks for the new ->ops functions as suggested by Rob Clark and Sumit Semwal. - Rebased on top of latest dma-buf-next git. Changes in v4: - Fixup a missing - in a return -EINVAL; statement. Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Rob Clark <rob@ti.com> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Diffstat (limited to 'include/linux/dma-buf.h')
-rw-r--r--include/linux/dma-buf.h59
1 files changed, 59 insertions, 0 deletions
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 24e0f4828711..ee7ef9990d9a 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -50,6 +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 *,
@@ -73,6 +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 *);
};
/**
@@ -140,6 +159,14 @@ 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 *,
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,
@@ -188,6 +215,38 @@ static inline void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
return;
}
+static inline int dma_buf_begin_cpu_access(struct dma_buf *,
+ size_t, size_t,
+ enum dma_data_direction)
+{
+ return -ENODEV;
+}
+
+static inline void dma_buf_end_cpu_access(struct dma_buf *,
+ size_t, size_t,
+ enum dma_data_direction)
+{
+}
+
+static inline void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long)
+{
+ return NULL;
+}
+
+static inline void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long,
+ void *)
+{
+}
+
+static inline void *dma_buf_kmap(struct dma_buf *, unsigned long)
+{
+ return NULL;
+}
+
+static inline void dma_buf_kunmap(struct dma_buf *, unsigned long,
+ void *)
+{
+}
#endif /* CONFIG_DMA_SHARED_BUFFER */
#endif /* __DMA_BUF_H__ */