common: dma-mapping: introduce dma_get_sgtable() function

This patch adds dma_get_sgtable() function which is required to let
drivers to share the buffers allocated by DMA-mapping subsystem. Right
now the driver gets a dma address of the allocated buffer and the kernel
virtual mapping for it. If it wants to share it with other device (= map
into its dma address space) it usually hacks around kernel virtual
addresses to get pointers to pages or assumes that both devices share
the DMA address space. Both solutions are just hacks for the special
cases, which should be avoided in the final version of buffer sharing.

To solve this issue in a generic way, a new call to DMA mapping has been
introduced - dma_get_sgtable(). It allocates a scatter-list which
describes the allocated buffer and lets the driver(s) to use it with
other device(s) by calling dma_map_sg() on it.

This patch provides a generic implementation based on virt_to_page()
call. Architectures which require more sophisticated translation might
provide their own get_sgtable() methods.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 39 insertions, 0 deletions

diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index db5db02e885f..3fbedc75e7c5 100644
--- a/drivers/base/dma-mapping.c
+++ b/drivers/base/dma-mapping.c
@@ -218,6 +218,24 @@ void dmam_release_declared_memory(struct device *dev)
 }
 EXPORT_SYMBOL(dmam_release_declared_memory);
 
+/*
+ * Create scatter-list for the already allocated DMA buffer.
+ */
+int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
+                 void *cpu_addr, dma_addr_t handle, size_t size)
+{
+        struct page *page = virt_to_page(cpu_addr);
+        int ret;
+
+        ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
+        if (unlikely(ret))
+                return ret;
+
+        sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
+        return 0;
+}
+EXPORT_SYMBOL(dma_common_get_sgtable);
+
 #endif
 
 /*
diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h
index 9073aeb3bb1a..de8bf89940f8 100644
--- a/include/asm-generic/dma-mapping-common.h
+++ b/include/asm-generic/dma-mapping-common.h
@@ -213,4 +213,22 @@ static inline int dma_mmap_writecombine(struct device *dev, struct vm_area_struc
         return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);
 }
 
+int
+dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
+                       void *cpu_addr, dma_addr_t dma_addr, size_t size);
+
+static inline int
+dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
+                      dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs)
+{
+        struct dma_map_ops *ops = get_dma_ops(dev);
+        BUG_ON(!ops);
+        if (ops->get_sgtable)
+                return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
+                                        attrs);
+        return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
+}
+
+#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, NULL)
+
 #endif
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index dfc099e56a66..94af41858513 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -18,6 +18,9 @@ struct dma_map_ops {
         int (*mmap)(struct device *, struct vm_area_struct *,
                           void *, dma_addr_t, size_t, struct dma_attrs *attrs);
 
+        int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
+                           dma_addr_t, size_t, struct dma_attrs *attrs);
+
         dma_addr_t (*map_page)(struct device *dev, struct page *page,
                                unsigned long offset, size_t size,
                                enum dma_data_direction dir,