drm/nouveau: debugfs: implement DRM GPU VA debugfs

Provide the driver indirection iterating over all DRM GPU VA spaces to
enable the common 'gpuvas' debugfs file for dumping DRM GPU VA spaces.

Signed-off-by: Danilo Krummrich <dakr@redhat.com>

drivers/gpu/drm/nouveau/nouveau_debugfs.c

@@ -202,6 +202,29 @@ nouveau_debugfs_pstate_open(struct inode *inode, struct file *file)
 	return single_open(file, nouveau_debugfs_pstate_get, inode->i_private);
 }
 
+static int
+nouveau_debugfs_gpuva(struct seq_file *m, void *data)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct nouveau_drm *drm = nouveau_drm(node->minor->dev);
+	struct nouveau_cli *cli;
+
+	mutex_lock(&drm->clients_lock);
+	list_for_each_entry(cli, &drm->clients, head) {
+		struct nouveau_uvmm *uvmm = nouveau_cli_uvmm(cli);
+
+		if (!uvmm)
+			continue;
+
+		mutex_lock(&uvmm->mutex);
+		drm_debugfs_gpuva_info(m, &uvmm->umgr);
+		mutex_unlock(&uvmm->mutex);
+	}
+	mutex_unlock(&drm->clients_lock);
+
+	return 0;
+}
+
 static const struct file_operations nouveau_pstate_fops = {
 	.owner = THIS_MODULE,
 	.open = nouveau_debugfs_pstate_open,
@@ -213,6 +236,7 @@ static const struct file_operations nouveau_pstate_fops = {
 static struct drm_info_list nouveau_debugfs_list[] = {
 	{ "vbios.rom",  nouveau_debugfs_vbios_image, 0, NULL },
 	{ "strap_peek", nouveau_debugfs_strap_peek, 0, NULL },
+	DRM_DEBUGFS_GPUVA_INFO(nouveau_debugfs_gpuva, NULL),
 };
 #define NOUVEAU_DEBUGFS_ENTRIES ARRAY_SIZE(nouveau_debugfs_list)