[PATCH 04/12] dma-buf: add optional invalidate_mappings callback v5

[Christian KÃnig]

Each importer can now provide an invalidate_mappings callback.

This allows the exporter to provide the mappings without the need to pin
the backing store.

v2: don't try to invalidate mappings when the callback is NULL,
    lock the reservation obj while using the attachments,
    add helper to set the callback
v3: move flag for invalidation support into the DMA-buf,
    use new attach_info structure to set the callback
v4: use importer_priv field instead of mangling exporter priv.
v5: drop invalidation_supported flag

Signed-off-by: Christian KÃnig <christian.koenig@xxxxxxx>
---
 drivers/dma-buf/dma-buf.c | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/dma-buf.h   | 33 +++++++++++++++++++++++++++++++--
 2 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 83c92bfd964c..a3738fab3927 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -563,6 +563,8 @@ struct dma_buf_attachment *dma_buf_attach(const struct dma_buf_attach_info *info
 
 	attach->dev = info->dev;
 	attach->dmabuf = dmabuf;
+	attach->importer_priv = info->importer_priv;
+	attach->invalidate = info->invalidate;
 
 	mutex_lock(&dmabuf->lock);
 
@@ -571,7 +573,9 @@ struct dma_buf_attachment *dma_buf_attach(const struct dma_buf_attach_info *info
 		if (ret)
 			goto err_attach;
 	}
+	reservation_object_lock(dmabuf->resv, NULL);
 	list_add(&attach->node, &dmabuf->attachments);
+	reservation_object_unlock(dmabuf->resv);
 
 	mutex_unlock(&dmabuf->lock);
 
@@ -615,7 +619,9 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)
 					   DMA_BIDIRECTIONAL);
 
 	mutex_lock(&dmabuf->lock);
+	reservation_object_lock(dmabuf->resv, NULL);
 	list_del(&attach->node);
+	reservation_object_unlock(dmabuf->resv);
 	if (dmabuf->ops->detach)
 		dmabuf->ops->detach(dmabuf, attach);
 
@@ -653,7 +659,16 @@ dma_buf_map_attachment_locked(struct dma_buf_attachment *attach,
 	if (attach->sgt)
 		return attach->sgt;
 
+	/*
+	 * Mapping a DMA-buf can trigger its invalidation, prevent sending this
+	 * event to the caller by temporary removing this attachment from the
+	 * list.
+	 */
+	if (attach->invalidate)
+		list_del(&attach->node);
 	sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
+	if (attach->invalidate)
+		list_add(&attach->node, &attach->dmabuf->attachments);
 	if (!sg_table)
 		sg_table = ERR_PTR(-ENOMEM);
 
@@ -751,6 +766,26 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
 }
 EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment);
 
+/**
+ * dma_buf_invalidate_mappings - invalidate all mappings of this dma_buf
+ *
+ * @dmabuf:	[in]	buffer which mappings should be invalidated
+ *
+ * Informs all attachmenst that they need to destroy and recreated all their
+ * mappings.
+ */
+void dma_buf_invalidate_mappings(struct dma_buf *dmabuf)
+{
+	struct dma_buf_attachment *attach;
+
+	reservation_object_assert_held(dmabuf->resv);
+
+	list_for_each_entry(attach, &dmabuf->attachments, node)
+		if (attach->invalidate)
+			attach->invalidate(attach);
+}
+EXPORT_SYMBOL_GPL(dma_buf_invalidate_mappings);
+
 /**
  * DOC: cpu access
  *
@@ -1163,10 +1198,12 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
 		seq_puts(s, "\tAttached Devices:\n");
 		attach_count = 0;
 
+		reservation_object_lock(buf_obj->resv, NULL);
 		list_for_each_entry(attach_obj, &buf_obj->attachments, node) {
 			seq_printf(s, "\t%s\n", dev_name(attach_obj->dev));
 			attach_count++;
 		}
+		reservation_object_unlock(buf_obj->resv);
 
 		seq_printf(s, "Total %d devices attached\n\n",
 				attach_count);
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 7e23758db3a4..ece4638359a8 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -324,6 +324,7 @@ struct dma_buf {
  * @dev: device attached to the buffer.
  * @node: list of dma_buf_attachment.
  * @priv: exporter specific attachment data.
+ * @importer_priv: importer specific attachment data.
  *
  * This structure holds the attachment information between the dma_buf buffer
  * and its user device(s). The list contains one attachment struct per device
@@ -340,6 +341,29 @@ struct dma_buf_attachment {
 	struct list_head node;
 	void *priv;
 	struct sg_table *sgt;
+	void *importer_priv;
+
+	/**
+	 * @invalidate:
+	 *
+	 * Optional callback provided by the importer of the dma-buf.
+	 *
+	 * If provided the exporter can avoid pinning the backing store while
+	 * mappings exists.
+	 *
+	 * The function is called with the lock of the reservation object
+	 * associated with the dma_buf held and the mapping function must be
+	 * called with this lock held as well. This makes sure that no mapping
+	 * is created concurrently with an ongoing invalidation.
+	 *
+	 * After the callback all existing mappings are still valid until all
+	 * fences in the dma_bufs reservation object are signaled, but should be
+	 * destroyed by the importer as soon as possible.
+	 *
+	 * New mappings can be created immediately, but can't be used before the
+	 * exclusive fence in the dma_bufs reservation object is signaled.
+	 */
+	void (*invalidate)(struct dma_buf_attachment *attach);
 };
 
 /**
@@ -378,8 +402,10 @@ struct dma_buf_export_info {
 
 /**
  * struct dma_buf_attach_info - holds information needed to attach to a dma_buf
- * @dmabuf:	the exported dma_buf
- * @dev:	the device which wants to import the attachment
+ * @dmabuf:		the exported dma_buf
+ * @dev:		the device which wants to import the attachment
+ * @importer_priv:	private data of importer to this attachment
+ * @invalidate:		callback to use for invalidating mappings
  *
  * This structure holds the information required to attach to a buffer. Used
  * with dma_buf_attach() only.
@@ -387,6 +413,8 @@ struct dma_buf_export_info {
 struct dma_buf_attach_info {
 	struct dma_buf *dmabuf;
 	struct device *dev;
+	void *importer_priv;
+	void (*invalidate)(struct dma_buf_attachment *attach);
 };
 
 /**
@@ -423,6 +451,7 @@ void dma_buf_unmap_attachment_locked(struct dma_buf_attachment *,
 				     enum dma_data_direction);
 void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
 				enum dma_data_direction);
+void dma_buf_invalidate_mappings(struct dma_buf *dma_buf);
 int dma_buf_begin_cpu_access(struct dma_buf *dma_buf,
 			     enum dma_data_direction dir);
 int dma_buf_end_cpu_access(struct dma_buf *dma_buf,
-- 
2.17.1