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authorPaul Kocialkowski <paul.kocialkowski@bootlin.com>2019-02-20 16:51:24 +0100
committerMaxime Ripard <maxime.ripard@bootlin.com>2019-03-06 14:48:07 +0100
commit6b5c029df5e40704a6642e026e709dd0dec44622 (patch)
treeced9d04d7004319164bd32c42ada01316ecd10a0
parent4686da83154d87be6e754ddc68e4ac89b0027ea9 (diff)
downloadlinux-6b5c029df5e40704a6642e026e709dd0dec44622.tar.bz2
drm/vc4: Add a debugfs entry to disable/enable the load tracker
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
-rw-r--r--drivers/gpu/drm/vc4/vc4_debugfs.c9
-rw-r--r--drivers/gpu/drm/vc4/vc4_drv.h3
-rw-r--r--drivers/gpu/drm/vc4/vc4_kms.c9
3 files changed, 21 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_debugfs.c b/drivers/gpu/drm/vc4/vc4_debugfs.c
index 64021bcba041..59cdad89f844 100644
--- a/drivers/gpu/drm/vc4/vc4_debugfs.c
+++ b/drivers/gpu/drm/vc4/vc4_debugfs.c
@@ -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);
}
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index bbab084911f3..7a3c093e7443 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -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;
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index 6e20604573de..5160cad25fce 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -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() */