ARM: 8508/2: videobuf2-dc: Let drivers specify DMA attrs

DMA allocations might be subject to certain requirements specific to the
hardware using the buffers, such as availability of kernel mapping (for
contents fix-ups in the driver). The only entity that knows them is the
driver, so it must share this knowledge with vb2-dc.

This patch extends the alloc_ctx initialization interface to let the
driver specify DMA attrs, which are then stored inside the allocation
context and will be used for all allocations with that context.

As a side effect, all dma_*_coherent() calls are turned into
dma_*_attrs() calls, because the attributes need to be carried over
through all DMA operations.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 32 insertions, 12 deletions

diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
index c33127284cfe..5361197f3e57 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -23,13 +23,16 @@
 
 struct vb2_dc_conf {
         struct device           *dev;
+        struct dma_attrs        attrs;
 };
 
 struct vb2_dc_buf {
         struct device                   *dev;
         void                            *vaddr;
         unsigned long                   size;
+        void                            *cookie;
         dma_addr_t                      dma_addr;
+        struct dma_attrs                attrs;
         enum dma_data_direction         dma_dir;
         struct sg_table                 *dma_sgt;
         struct frame_vector             *vec;
@@ -131,7 +134,8 @@ static void vb2_dc_put(void *buf_priv)
                 sg_free_table(buf->sgt_base);
                 kfree(buf->sgt_base);
         }
-        dma_free_coherent(buf->dev, buf->size, buf->vaddr, buf->dma_addr);
+        dma_free_attrs(buf->dev, buf->size, buf->cookie, buf->dma_addr,
+                        &buf->attrs);
         put_device(buf->dev);
         kfree(buf);
 }
@@ -147,14 +151,18 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size,
         if (!buf)
                 return ERR_PTR(-ENOMEM);
 
-        buf->vaddr = dma_alloc_coherent(dev, size, &buf->dma_addr,
-                                                GFP_KERNEL | gfp_flags);
-        if (!buf->vaddr) {
+        buf->attrs = conf->attrs;
+        buf->cookie = dma_alloc_attrs(dev, size, &buf->dma_addr,
+                                        GFP_KERNEL | gfp_flags, &buf->attrs);
+        if (!buf->cookie) {
                 dev_err(dev, "dma_alloc_coherent of size %ld failed\n", size);
                 kfree(buf);
                 return ERR_PTR(-ENOMEM);
         }
 
+        if (!dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &buf->attrs))
+                buf->vaddr = buf->cookie;
+
         /* Prevent the device from being released while the buffer is used */
         buf->dev = get_device(dev);
         buf->size = size;
@@ -185,8 +193,8 @@ static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma)
          */
         vma->vm_pgoff = 0;
 
-        ret = dma_mmap_coherent(buf->dev, vma, buf->vaddr,
-                buf->dma_addr, buf->size);
+        ret = dma_mmap_attrs(buf->dev, vma, buf->cookie,
+                buf->dma_addr, buf->size, &buf->attrs);
 
         if (ret) {
                 pr_err("Remapping memory failed, error: %d\n", ret);
@@ -329,7 +337,7 @@ static void *vb2_dc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum)
 {
         struct vb2_dc_buf *buf = dbuf->priv;
 
-        return buf->vaddr + pgnum * PAGE_SIZE;
+        return buf->vaddr ? buf->vaddr + pgnum * PAGE_SIZE : NULL;
 }
 
 static void *vb2_dc_dmabuf_ops_vmap(struct dma_buf *dbuf)
@@ -368,8 +376,8 @@ static struct sg_table *vb2_dc_get_base_sgt(struct vb2_dc_buf *buf)
                 return NULL;
         }
 
-        ret = dma_get_sgtable(buf->dev, sgt, buf->vaddr, buf->dma_addr,
-                buf->size);
+        ret = dma_get_sgtable_attrs(buf->dev, sgt, buf->cookie, buf->dma_addr,
+                buf->size, &buf->attrs);
         if (ret < 0) {
                 dev_err(buf->dev, "failed to get scatterlist from DMA API\n");
                 kfree(sgt);
@@ -721,7 +729,8 @@ const struct vb2_mem_ops vb2_dma_contig_memops = {
 };
 EXPORT_SYMBOL_GPL(vb2_dma_contig_memops);
 
-void *vb2_dma_contig_init_ctx(struct device *dev)
+void *vb2_dma_contig_init_ctx_attrs(struct device *dev,
+                                    struct dma_attrs *attrs)
 {
         struct vb2_dc_conf *conf;
 
@@ -730,10 +739,12 @@ void *vb2_dma_contig_init_ctx(struct device *dev)
                 return ERR_PTR(-ENOMEM);
 
         conf->dev = dev;
+        if (attrs)
+                conf->attrs = *attrs;
 
         return conf;
 }
-EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx);
+EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx_attrs);
 
 void vb2_dma_contig_cleanup_ctx(void *alloc_ctx)
 {
diff --git a/include/media/videobuf2-dma-contig.h b/include/media/videobuf2-dma-contig.h
index c33dfa69d7ab..2087c9a68be3 100644
--- a/include/media/videobuf2-dma-contig.h
+++ b/include/media/videobuf2-dma-contig.h
@@ -16,6 +16,8 @@
 #include <media/videobuf2-v4l2.h>
 #include <linux/dma-mapping.h>
 
+struct dma_attrs;
+
 static inline dma_addr_t
 vb2_dma_contig_plane_dma_addr(struct vb2_buffer *vb, unsigned int plane_no)
 {
@@ -24,7 +26,14 @@ vb2_dma_contig_plane_dma_addr(struct vb2_buffer *vb, unsigned int plane_no)
         return *addr;
 }
 
-void *vb2_dma_contig_init_ctx(struct device *dev);
+void *vb2_dma_contig_init_ctx_attrs(struct device *dev,
+                                    struct dma_attrs *attrs);
+
+static inline void *vb2_dma_contig_init_ctx(struct device *dev)
+{
+        return vb2_dma_contig_init_ctx_attrs(dev, NULL);
+}
+
 void vb2_dma_contig_cleanup_ctx(void *alloc_ctx);
 
 extern const struct vb2_mem_ops vb2_dma_contig_memops;