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drm/vc4: Add a debugfs entry to disable/enable the load tracker

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In order to test whether the load tracker is working as expected, we
need the ability to compare the commit result with the underrun
indication. With the load tracker always enabled, commits that are
expected to trigger an underrun are always rejected, so userspace
cannot get the actual underrun indication from the hardware.

Add a debugfs entry to disable/enable the load tracker, so that a DRM
commit expected to trigger an underrun can go through with the load
tracker disabled. The underrun indication is then available to
userspace and can be checked against the commit result with the load
tracker enabled.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190220155124.25022-4-paul.kocialkowski@bootlin.com
This commit is contained in:
Paul Kocialkowski
2019-02-20 16:51:24 +01:00
committed by Maxime Ripard
parent 4686da8315
commit 6b5c029df5
3 changed files with 21 additions and 0 deletions
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9
drivers/gpu/drm/vc4/vc4_debugfs.c
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@@ -36,6 +36,15 @@ static const struct drm_info_list vc4_debugfs_list[] = {
int
vc4_debugfs_init(struct drm_minor *minor)
{
struct vc4_dev *vc4 = to_vc4_dev(minor->dev);
struct dentry *dentry;
dentry = debugfs_create_bool("hvs_load_tracker", S_IRUGO | S_IWUSR,
minor->debugfs_root,
&vc4->load_tracker_enabled);
if (!dentry)
return -ENOMEM;
return drm_debugfs_create_files(vc4_debugfs_list, VC4_DEBUGFS_ENTRIES,
minor->debugfs_root, minor);
}