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author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2015-12-14 23:39:44 +0300 |
---|---|---|
committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2016-03-03 18:36:42 +0300 |
commit | b22e6690a3f656e3adb821ab4859e02932048066 (patch) | |
tree | 85d15d2067e5b914ba705e3e510dc41f734853b7 /drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | |
parent | 9cba3b9945d0dd8df9629768f04e23f933e4b0d0 (diff) | |
download | linux-b22e6690a3f656e3adb821ab4859e02932048066.tar.xz |
drm/omap: gem: Implement dma_buf import
OMAP GEM objects backed by dma_buf reuse the current OMAP GEM object
support as much as possible. If the imported buffer is physically
contiguous its physical address will be used directly, reusing the
OMAP_BO_MEM_DMA_API code paths. Otherwise it will be mapped through the
TILER using a pages list created from the scatterlist instead of the
shmem backing storage.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c')
-rw-r--r-- | drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 53 |
1 files changed, 43 insertions, 10 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c index 27c297672076..19e426b698d3 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -21,6 +21,10 @@ #include "omap_drv.h" +/* ----------------------------------------------------------------------------- + * DMABUF Export + */ + static struct sg_table *omap_gem_map_dma_buf( struct dma_buf_attachment *attachment, enum dma_data_direction dir) @@ -178,15 +182,20 @@ struct dma_buf *omap_gem_prime_export(struct drm_device *dev, return dma_buf_export(&exp_info); } +/* ----------------------------------------------------------------------------- + * DMABUF Import + */ + struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev, - struct dma_buf *buffer) + struct dma_buf *dma_buf) { + struct dma_buf_attachment *attach; struct drm_gem_object *obj; + struct sg_table *sgt; + int ret; - /* is this one of own objects? */ - if (buffer->ops == &omap_dmabuf_ops) { - obj = buffer->priv; - /* is it from our device? */ + if (dma_buf->ops == &omap_dmabuf_ops) { + obj = dma_buf->priv; if (obj->dev == dev) { /* * Importing dmabuf exported from out own gem increases @@ -197,9 +206,33 @@ struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev, } } - /* - * TODO add support for importing buffers from other devices.. - * for now we don't need this but would be nice to add eventually - */ - return ERR_PTR(-EINVAL); + attach = dma_buf_attach(dma_buf, dev->dev); + if (IS_ERR(attach)) + return ERR_CAST(attach); + + get_dma_buf(dma_buf); + + sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); + if (IS_ERR(sgt)) { + ret = PTR_ERR(sgt); + goto fail_detach; + } + + obj = omap_gem_new_dmabuf(dev, dma_buf->size, sgt); + if (IS_ERR(obj)) { + ret = PTR_ERR(obj); + goto fail_unmap; + } + + obj->import_attach = attach; + + return obj; + +fail_unmap: + dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); +fail_detach: + dma_buf_detach(dma_buf, attach); + dma_buf_put(dma_buf); + + return ERR_PTR(ret); } |