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From:   Dmitry Osipenko <dmitry.osipenko@collabora.com>
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Subject: [PATCH v3 2/9] dma-buf: Add locked variant of dma_buf_vmap/vunmap()
Date:   Wed, 24 Aug 2022 13:22:41 +0300
Message-Id: <20220824102248.91964-3-dmitry.osipenko@collabora.com>
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Add locked variant of dma_buf_vmap/vunmap() that will be utilized by
DRM drivers once vmap/unmap functions will be moved to the new locking
convention.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 drivers/dma-buf/dma-buf.c | 42 +++++++++++++++++++++++++++++++++++----
 include/linux/dma-buf.h   |  2 ++
 2 files changed, 40 insertions(+), 4 deletions(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 452a6a1f1e60..34173aafe6c9 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -1373,7 +1373,7 @@ int dma_buf_mmap_unlocked(struct dma_buf *dmabuf, struct vm_area_struct *vma,
 EXPORT_SYMBOL_NS_GPL(dma_buf_mmap_unlocked, DMA_BUF);
 
 /**
- * dma_buf_vmap_unlocked - Create virtual mapping for the buffer object into kernel
+ * dma_buf_vmap - Create virtual mapping for the buffer object into kernel
  * address space. Same restrictions as for vmap and friends apply.
  * @dmabuf:	[in]	buffer to vmap
  * @map:	[out]	returns the vmap pointer
@@ -1388,7 +1388,7 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_mmap_unlocked, DMA_BUF);
  *
  * Returns 0 on success, or a negative errno code otherwise.
  */
-int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map)
+int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map)
 {
 	struct iosys_map ptr;
 	int ret = 0;
@@ -1424,14 +1424,34 @@ int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map)
 	mutex_unlock(&dmabuf->lock);
 	return ret;
 }
+EXPORT_SYMBOL_NS_GPL(dma_buf_vmap, DMA_BUF);
+
+/**
+ * dma_buf_vmap_unlocked - Create virtual mapping for the buffer object into kernel
+ * address space. Same restrictions as for vmap and friends apply.
+ * @dmabuf:	[in]	buffer to vmap
+ * @map:	[out]	returns the vmap pointer
+ *
+ * Unlocked version of dma_buf_vmap()
+ *
+ * Returns 0 on success, or a negative errno code otherwise.
+ */
+int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map)
+{
+	int ret;
+
+	ret = dma_buf_vmap(dmabuf, map);
+
+	return ret;
+}
 EXPORT_SYMBOL_NS_GPL(dma_buf_vmap_unlocked, DMA_BUF);
 
 /**
- * dma_buf_vunmap_unlocked - Unmap a vmap obtained by dma_buf_vmap.
+ * dma_buf_vunmap - Unmap a vmap obtained by dma_buf_vmap.
  * @dmabuf:	[in]	buffer to vunmap
  * @map:	[in]	vmap pointer to vunmap
  */
-void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map)
+void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map)
 {
 	if (WARN_ON(!dmabuf))
 		return;
@@ -1448,6 +1468,20 @@ void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map)
 	}
 	mutex_unlock(&dmabuf->lock);
 }
+EXPORT_SYMBOL_NS_GPL(dma_buf_vunmap, DMA_BUF);
+
+/**
+ * dma_buf_vunmap_unlocked - Unmap a vmap obtained by dma_buf_vmap.
+ * @dmabuf:	[in]	buffer to vunmap
+ * @map:	[in]	vmap pointer to vunmap
+ */
+void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map)
+{
+	if (WARN_ON(!dmabuf))
+		return;
+
+	dma_buf_vunmap(dmabuf, map);
+}
 EXPORT_SYMBOL_NS_GPL(dma_buf_vunmap_unlocked, DMA_BUF);
 
 #ifdef CONFIG_DEBUG_FS
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 9ab09569dec1..da2057569101 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -636,4 +636,6 @@ int dma_buf_mmap_unlocked(struct dma_buf *, struct vm_area_struct *,
 			  unsigned long);
 int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map);
 void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map);
+int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map);
+void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map);
 #endif /* __DMA_BUF_H__ */
-- 
2.37.2