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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
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
3 changed files with 21 additions and 0 deletions
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9
drivers/gpu/drm/vc4/vc4_debugfs.c
View File

@ -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);
}

3
drivers/gpu/drm/vc4/vc4_drv.h
View File

@ -195,6 +195,9 @@ struct vc4_dev {
int power_refcount;
/* Set to true when the load tracker is active. */
bool load_tracker_enabled;
/* Mutex controlling the power refcount. */
struct mutex power_lock;

9
drivers/gpu/drm/vc4/vc4_kms.c
View File

@ -439,6 +439,10 @@ static int vc4_load_tracker_atomic_check(struct drm_atomic_state *state)
}
}
/* Don't check the load when the tracker is disabled. */
if (!vc4->load_tracker_enabled)
return 0;
/* The absolute limit is 2Gbyte/sec, but let's take a margin to let
* the system work when other blocks are accessing the memory.
*/
@ -511,6 +515,11 @@ int vc4_kms_load(struct drm_device *dev)
struct vc4_load_tracker_state *load_state;
int ret;
/* Start with the load tracker enabled. Can be disabled through the
* debugfs load_tracker file.
*/
vc4->load_tracker_enabled = true;
sema_init(&vc4->async_modeset, 1);
/* Set support for vblank irq fast disable, before drm_vblank_init() */