Split the individual steps of GEM object allocation and initialization
clearly. This improves readability and prepares for dma_buf import
support.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/omapdrm/omap_gem.c | 75 ++++++++++++++++++++++----------------
1 file changed, 43 insertions(+), 32 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index ba16d792a33e..51580eaa37af 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -1345,67 +1345,80 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
size_t size;
int ret;
+ /* Validate the flags and compute the memory and cache flags. */
if (flags & OMAP_BO_TILED) {
if (!priv->usergart) {
dev_err(dev->dev, "Tiled buffers require DMM\n");
return NULL;
}
- /* tiled buffers are always shmem paged backed.. when they are
- * scanned out, they are remapped into DMM/TILER
+ /*
+ * Tiled buffers are always shmem paged backed. When they are
+ * scanned out, they are remapped into DMM/TILER.
*/
flags &= ~OMAP_BO_SCANOUT;
+ flags |= OMAP_BO_MEM_SHMEM;
- /* currently don't allow cached buffers.. there is some caching
- * stuff that needs to be handled better
+ /*
+ * Currently don't allow cached buffers. There is some caching
+ * stuff that needs to be handled better.
*/
flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
flags |= tiler_get_cpu_cache_flags();
-
- /* align dimensions to slot boundaries... */
- tiler_align(gem2fmt(flags),
- &gsize.tiled.width, &gsize.tiled.height);
-
- /* ...and calculate size based on aligned dimensions */
- size = tiler_size(gem2fmt(flags),
- gsize.tiled.width, gsize.tiled.height);
- } else {
- size = PAGE_ALIGN(gsize.bytes);
+ } else if ((flags & OMAP_BO_SCANOUT) && !priv->usergart) {
+ /*
+ * Use contiguous memory if we don't have DMM to remap
+ * discontiguous buffers.
+ */
+ flags |= OMAP_BO_MEM_DMA_API;
+ } else if (!(flags & OMAP_BO_MEM_EXT)) {
+ /*
+ * All other buffers not backed with external memory are
+ * shmem-backed.
+ */
+ flags |= OMAP_BO_MEM_SHMEM;
}
+ /* Allocate the initialize the OMAP GEM object. */
omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
if (!omap_obj)
return NULL;
obj = &omap_obj->base;
+ omap_obj->flags = flags;
- if ((flags & OMAP_BO_SCANOUT) && !priv->usergart) {
- /* attempt to allocate contiguous memory if we don't
- * have DMM for remappign discontiguous buffers
+ if (flags & OMAP_BO_TILED) {
+ /*
+ * For tiled buffers align dimensions to slot boundaries and
+ * calculate size based on aligned dimensions.
*/
- omap_obj->vaddr = dma_alloc_writecombine(dev->dev, size,
- &omap_obj->paddr, GFP_KERNEL);
- if (!omap_obj->vaddr) {
- kfree(omap_obj);
+ tiler_align(gem2fmt(flags), &gsize.tiled.width,
+ &gsize.tiled.height);
- return NULL;
- }
+ size = tiler_size(gem2fmt(flags), gsize.tiled.width,
+ gsize.tiled.height);
- flags |= OMAP_BO_MEM_DMA_API;
+ omap_obj->width = gsize.tiled.width;
+ omap_obj->height = gsize.tiled.height;
+ } else {
+ size = PAGE_ALIGN(gsize.bytes);
}
spin_lock(&priv->list_lock);
list_add(&omap_obj->mm_list, &priv->obj_list);
spin_unlock(&priv->list_lock);
- omap_obj->flags = flags;
-
- if (flags & OMAP_BO_TILED) {
- omap_obj->width = gsize.tiled.width;
- omap_obj->height = gsize.tiled.height;
+ /* Allocate memory if needed. */
+ if (flags & OMAP_BO_MEM_DMA_API) {
+ omap_obj->vaddr = dma_alloc_writecombine(dev->dev, size,
+ &omap_obj->paddr,
+ GFP_KERNEL);
+ if (!omap_obj->vaddr)
+ goto fail;
}
- if (flags & (OMAP_BO_MEM_DMA_API | OMAP_BO_MEM_EXT)) {
+ /* Initialize the GEM object. */
+ if (!(flags & OMAP_BO_MEM_SHMEM)) {
drm_gem_private_object_init(dev, obj, size);
} else {
ret = drm_gem_object_init(dev, obj, size);
@@ -1414,8 +1427,6 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
mapping = file_inode(obj->filp)->i_mapping;
mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
-
- omap_obj->flags |= OMAP_BO_MEM_SHMEM;
}
return obj;
--
2.4.10
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