drm/nouveau: add debugfs file to forcibly evict everything from vram

Very useful for debugging buffer migration issues.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
index 7933de4..8e15923 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
@@ -157,7 +157,23 @@ nouveau_debugfs_vbios_image(struct seq_file *m, void *data)
        return 0;
 }
 
+static int
+nouveau_debugfs_evict_vram(struct seq_file *m, void *data)
+{
+       struct drm_info_node *node = (struct drm_info_node *) m->private;
+       struct drm_nouveau_private *dev_priv = node->minor->dev->dev_private;
+       int ret;
+
+       ret = ttm_bo_evict_mm(&dev_priv->ttm.bdev, TTM_PL_VRAM);
+       if (ret)
+               seq_printf(m, "failed: %d", ret);
+       else
+               seq_printf(m, "succeeded\n");
+       return 0;
+}
+
 static struct drm_info_list nouveau_debugfs_list[] = {
+       { "evict_vram", nouveau_debugfs_evict_vram, 0, NULL },
        { "chipset", nouveau_debugfs_chipset_info, 0, NULL },
        { "memory", nouveau_debugfs_memory_info, 0, NULL },
        { "vbios.rom", nouveau_debugfs_vbios_image, 0, NULL },