drm/cma: add low-level hook functions to use prime helpers

Instead of using the dma_buf functionality for GEM CMA, we can use prime
helpers if we can provide low-level hook functions for GEM CMA.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
index ce06397..83a45e5 100644 (file)
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -602,3 +602,82 @@ error_gem_free:
        return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(drm_gem_cma_dmabuf_import);
+
+/* low-level interface prime helpers */
+struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
+{
+       struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
+       struct sg_table *sgt;
+       int ret;
+
+       sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
+       if (!sgt)
+               return NULL;
+
+       ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
+                             cma_obj->paddr, obj->size);
+       if (ret < 0)
+               goto out;
+
+       return sgt;
+
+out:
+       kfree(sgt);
+       return NULL;
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);
+
+struct drm_gem_object *
+drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size,
+                                 struct sg_table *sgt)
+{
+       struct drm_gem_cma_object *cma_obj;
+
+       if (sgt->nents != 1)
+               return ERR_PTR(-EINVAL);
+
+       /* Create a CMA GEM buffer. */
+       cma_obj = __drm_gem_cma_create(dev, size);
+       if (IS_ERR(cma_obj))
+               return ERR_PTR(PTR_ERR(cma_obj));
+
+       cma_obj->paddr = sg_dma_address(sgt->sgl);
+       cma_obj->sgt = sgt;
+
+       DRM_DEBUG_PRIME("dma_addr = 0x%x, size = %zu\n", cma_obj->paddr, size);
+
+       return &cma_obj->base;
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
+
+int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
+                          struct vm_area_struct *vma)
+{
+       struct drm_gem_cma_object *cma_obj;
+       struct drm_device *dev = obj->dev;
+       int ret;
+
+       mutex_lock(&dev->struct_mutex);
+       ret = drm_gem_mmap_obj(obj, obj->size, vma);
+       mutex_unlock(&dev->struct_mutex);
+       if (ret < 0)
+               return ret;
+
+       cma_obj = to_drm_gem_cma_obj(obj);
+       return drm_gem_cma_mmap_obj(cma_obj, vma);
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);
+
+void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj)
+{
+       struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
+
+       return cma_obj->vaddr;
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);
+
+void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+       /* Nothing to do */
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap);

diff --git a/include/drm/drm_gem_cma_helper.h b/include/drm/drm_gem_cma_helper.h
index 6e17251..9d39d2a 100644 (file)
--- a/include/drm/drm_gem_cma_helper.h
+++ b/include/drm/drm_gem_cma_helper.h
@@ -54,4 +54,13 @@ struct dma_buf *drm_gem_cma_dmabuf_export(struct drm_device *drm_dev,
 struct drm_gem_object *drm_gem_cma_dmabuf_import(struct drm_device *drm_dev,
                                                 struct dma_buf *dma_buf);
 
+struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj);
+struct drm_gem_object *
+drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size,
+                                 struct sg_table *sgt);
+int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
+                          struct vm_area_struct *vma);
+void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj);
+void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
+
 #endif /* __DRM_GEM_CMA_HELPER_H__ */