drm: add prime helpers

Instead of reimplementing all of the dma_buf functionality in every driver,
create helpers drm_prime_import and drm_prime_export that implement them in
terms of new, lower-level hook functions:

  gem_prime_pin: callback when a buffer is created, used to pin buffers into GTT
  gem_prime_get_sg_table: convert a drm_gem_object to an sg_table for export
  gem_prime_import_sg_table: convert an sg_table into a drm_gem_object
  gem_prime_vmap, gem_prime_vunmap: map and unmap an object

These hooks are optional; drivers can opt in by using drm_gem_prime_import and
drm_gem_prime_export as the .gem_prime_import and .gem_prime_export fields of
struct drm_driver.

v2:
- Drop .begin_cpu_access.  None of the drivers this code replaces implemented
  it.  Having it here was a leftover from when I was trying to include i915 in
  this rework.
- Use mutex_lock instead of mutex_lock_interruptible, as these three drivers
  did.  This patch series shouldn't change that behavior.
- Rename helpers to gem_prime_get_sg_table and gem_prime_import_sg_table.
  Rename struct sg_table* variables to 'sgt' for clarity.
- Update drm.tmpl for these new hooks.

v3:
- Pass the vaddr down to the driver.  This lets drivers that just call vunmap on
  the pointer avoid having to store the pointer in their GEM private structures.
- Move documentation into a /** DOC */ comment in drm_prime.c and include it in
  drm.tmpl with a !P line.  I tried to use !F lines to include documentation of
  the individual functions from drmP.h, but the docproc / kernel-doc scripts
  barf on that file, so hopefully this is good enough for now.
- apply refcount fix from commit be8a42ae60addd8b6092535c11b42d099d6470ec
  ("drm/prime: drop reference on imported dma-buf come from gem")

Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 6c11d77..b26de52 100644 (file)
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -743,6 +743,10 @@ char *date;</synopsis>
           These two operations are mandatory for GEM drivers that support DRM
           PRIME.
         </para>
+        <sect4>
+          <title>DRM PRIME Helper Functions Reference</title>
+!Pdrivers/gpu/drm/drm_prime.c PRIME Helpers
+        </sect4>
       </sect3>
       <sect3 id="drm-gem-objects-mapping">
         <title>GEM Objects Mapping</title>

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 7f12573..366910d 100644 (file)
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -53,7 +53,8 @@
  * Self-importing: if userspace is using PRIME as a replacement for flink
  * then it will get a fd->handle request for a GEM object that it created.
  * Drivers should detect this situation and return back the gem object
- * from the dma-buf private.
+ * from the dma-buf private.  Prime will do this automatically for drivers that
+ * use the drm_gem_prime_{import,export} helpers.
  */
 
 struct drm_prime_member {
@@ -62,6 +63,137 @@ struct drm_prime_member {
        uint32_t handle;
 };
 
+static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
+               enum dma_data_direction dir)
+{
+       struct drm_gem_object *obj = attach->dmabuf->priv;
+       struct sg_table *sgt;
+
+       mutex_lock(&obj->dev->struct_mutex);
+
+       sgt = obj->dev->driver->gem_prime_get_sg_table(obj);
+
+       if (!IS_ERR_OR_NULL(sgt))
+               dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir);
+
+       mutex_unlock(&obj->dev->struct_mutex);
+       return sgt;
+}
+
+static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
+               struct sg_table *sgt, enum dma_data_direction dir)
+{
+       dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
+       sg_free_table(sgt);
+       kfree(sgt);
+}
+
+static void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
+{
+       struct drm_gem_object *obj = dma_buf->priv;
+
+       if (obj->export_dma_buf == dma_buf) {
+               /* drop the reference on the export fd holds */
+               obj->export_dma_buf = NULL;
+               drm_gem_object_unreference_unlocked(obj);
+       }
+}
+
+static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
+{
+       struct drm_gem_object *obj = dma_buf->priv;
+       struct drm_device *dev = obj->dev;
+
+       return dev->driver->gem_prime_vmap(obj);
+}
+
+static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
+{
+       struct drm_gem_object *obj = dma_buf->priv;
+       struct drm_device *dev = obj->dev;
+
+       dev->driver->gem_prime_vunmap(obj, vaddr);
+}
+
+static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
+               unsigned long page_num)
+{
+       return NULL;
+}
+
+static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
+               unsigned long page_num, void *addr)
+{
+
+}
+static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf,
+               unsigned long page_num)
+{
+       return NULL;
+}
+
+static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
+               unsigned long page_num, void *addr)
+{
+
+}
+
+static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf,
+               struct vm_area_struct *vma)
+{
+       return -EINVAL;
+}
+
+static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {
+       .map_dma_buf = drm_gem_map_dma_buf,
+       .unmap_dma_buf = drm_gem_unmap_dma_buf,
+       .release = drm_gem_dmabuf_release,
+       .kmap = drm_gem_dmabuf_kmap,
+       .kmap_atomic = drm_gem_dmabuf_kmap_atomic,
+       .kunmap = drm_gem_dmabuf_kunmap,
+       .kunmap_atomic = drm_gem_dmabuf_kunmap_atomic,
+       .mmap = drm_gem_dmabuf_mmap,
+       .vmap = drm_gem_dmabuf_vmap,
+       .vunmap = drm_gem_dmabuf_vunmap,
+};
+
+/**
+ * DOC: PRIME Helpers
+ *
+ * Drivers can implement @gem_prime_export and @gem_prime_import in terms of
+ * simpler APIs by using the helper functions @drm_gem_prime_export and
+ * @drm_gem_prime_import.  These functions implement dma-buf support in terms of
+ * five lower-level driver callbacks:
+ *
+ * Export callbacks:
+ *
+ *  - @gem_prime_pin (optional): prepare a GEM object for exporting
+ *
+ *  - @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages
+ *
+ *  - @gem_prime_vmap: vmap a buffer exported by your driver
+ *
+ *  - @gem_prime_vunmap: vunmap a buffer exported by your driver
+ *
+ * Import callback:
+ *
+ *  - @gem_prime_import_sg_table (import): produce a GEM object from another
+ *    driver's scatter/gather table
+ */
+
+struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
+                                    struct drm_gem_object *obj, int flags)
+{
+       if (dev->driver->gem_prime_pin) {
+               int ret = dev->driver->gem_prime_pin(obj);
+               if (ret)
+                       return ERR_PTR(ret);
+       }
+       return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size,
+                             0600);
+}
+EXPORT_SYMBOL(drm_gem_prime_export);
+
 int drm_gem_prime_handle_to_fd(struct drm_device *dev,
                struct drm_file *file_priv, uint32_t handle, uint32_t flags,
                int *prime_fd)
@@ -117,6 +249,58 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
 
+struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
+                                           struct dma_buf *dma_buf)
+{
+       struct dma_buf_attachment *attach;
+       struct sg_table *sgt;
+       struct drm_gem_object *obj;
+       int ret;
+
+       if (!dev->driver->gem_prime_import_sg_table)
+               return ERR_PTR(-EINVAL);
+
+       if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) {
+               obj = dma_buf->priv;
+               if (obj->dev == dev) {
+                       /*
+                        * Importing dmabuf exported from out own gem increases
+                        * refcount on gem itself instead of f_count of dmabuf.
+                        */
+                       drm_gem_object_reference(obj);
+                       dma_buf_put(dma_buf);
+                       return obj;
+               }
+       }
+
+       attach = dma_buf_attach(dma_buf, dev->dev);
+       if (IS_ERR(attach))
+               return ERR_PTR(PTR_ERR(attach));
+
+       sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+       if (IS_ERR_OR_NULL(sgt)) {
+               ret = PTR_ERR(sgt);
+               goto fail_detach;
+       }
+
+       obj = dev->driver->gem_prime_import_sg_table(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);
+       return ERR_PTR(ret);
+}
+EXPORT_SYMBOL(drm_gem_prime_import);
+
 int drm_gem_prime_fd_to_handle(struct drm_device *dev,
                struct drm_file *file_priv, int prime_fd, uint32_t *handle)
 {

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 3aaa50d..2d94d74 100644 (file)
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -930,6 +930,14 @@ struct drm_driver {
        /* import dmabuf -> GEM */
        struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
                                struct dma_buf *dma_buf);
+       /* low-level interface used by drm_gem_prime_{import,export} */
+       int (*gem_prime_pin)(struct drm_gem_object *obj);
+       struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
+       struct drm_gem_object *(*gem_prime_import_sg_table)(
+                               struct drm_device *dev, size_t size,
+                               struct sg_table *sgt);
+       void *(*gem_prime_vmap)(struct drm_gem_object *obj);
+       void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
 
        /* vga arb irq handler */
        void (*vgaarb_irq)(struct drm_device *dev, bool state);
@@ -1562,9 +1570,13 @@ extern int drm_clients_info(struct seq_file *m, void* data);
 extern int drm_gem_name_info(struct seq_file *m, void *data);
 
 
+extern struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
+               struct drm_gem_object *obj, int flags);
 extern int drm_gem_prime_handle_to_fd(struct drm_device *dev,
                struct drm_file *file_priv, uint32_t handle, uint32_t flags,
                int *prime_fd);
+extern struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
+               struct dma_buf *dma_buf);
 extern int drm_gem_prime_fd_to_handle(struct drm_device *dev,
                struct drm_file *file_priv, int prime_fd, uint32_t *handle);