[PATCH v2 1/2] drm/i915/gt: Create per-tile debugfs files

[Andi Shyti]

> I am not sure if Tiles is appropriate usage here. Since MTL does not have the concept of tiles.
> Shouldn't we be using gt instead of tile in our usage?
> 
> With s/tile/gt/g,
> Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com> 

yes, GT is preferred to tile, generally. Thanks for the review, I
will change the commit log according to your comment.

Thanks!
Andi

> > -----Original Message-----
> > From: dri-devel <dri-devel-bounces at lists.freedesktop.org> On Behalf Of Andi
> > Shyti
> > Sent: Wednesday, March 1, 2023 3:03 AM
> > To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org
> > Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>; Andi Shyti
> > <andi at etezian.org>; Patelczyk, Maciej <maciej.patelczyk at intel.com>; Andi
> > Shyti <andi.shyti at linux.intel.com>; Wajdeczko, Michal
> > <Michal.Wajdeczko at intel.com>
> > Subject: [PATCH v2 1/2] drm/i915/gt: Create per-tile debugfs files
> > 
> > To support multi-GT configurations, we need to generate
> > independent debug files for each GT.
> > 
> > To achieve this create a separate directory for each GT under the
> > debugfs directory. For instance, in a system with two tiles, the
> > debugfs structure would look like this:
> > 
> > /sys/kernel/debug/dri
> >                   └── 0
> >                       ├── gt0
> >                       │   ├── drpc
> >                       │   ├── engines
> >                       │   ├── forcewake
> >                       │   ├── frequency
> >                       │   └── rps_boost
> >                       └── gt1
> >                       :   ├── drpc
> >                       :   ├── engines
> >                       :   ├── forcewake
> >                           ├── frequency
> >                           └── rps_boost
> > 
> > Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
> > Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> > ---
> >  drivers/gpu/drm/i915/gt/intel_gt_debugfs.c    | 4 +++-
> >  drivers/gpu/drm/i915/gt/uc/intel_guc.h        | 2 ++
> >  drivers/gpu/drm/i915/gt/uc/intel_guc_log.c    | 5 ++++-
> >  drivers/gpu/drm/i915/gt/uc/intel_uc_debugfs.c | 2 ++
> >  4 files changed, 11 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> > b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> > index 5fc2df01aa0df..4dc23b8d3aa2d 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_gt_debugfs.c
> > @@ -83,11 +83,13 @@ static void gt_debugfs_register(struct intel_gt *gt,
> > struct dentry *root)
> >  void intel_gt_debugfs_register(struct intel_gt *gt)
> >  {
> >  	struct dentry *root;
> > +	char gtname[4];
> > 
> >  	if (!gt->i915->drm.primary->debugfs_root)
> >  		return;
> > 
> > -	root = debugfs_create_dir("gt", gt->i915->drm.primary->debugfs_root);
> > +	snprintf(gtname, sizeof(gtname), "gt%u", gt->info.id);
> > +	root = debugfs_create_dir(gtname, gt->i915->drm.primary-
> > >debugfs_root);
> >  	if (IS_ERR(root))
> >  		return;
> > 
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> > b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> > index bb4dfe707a7d0..e46aac1a41e6d 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> > @@ -42,6 +42,8 @@ struct intel_guc {
> >  	/** @capture: the error-state-capture module's data and objects */
> >  	struct intel_guc_state_capture *capture;
> > 
> > +	struct dentry *dbgfs_node;
> > +
> >  	/** @sched_engine: Global engine used to submit requests to GuC */
> >  	struct i915_sched_engine *sched_engine;
> >  	/**
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
> > b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
> > index 195db8c9d4200..55bc8b55fbc05 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
> > @@ -542,8 +542,11 @@ static int guc_log_relay_create(struct intel_guc_log
> > *log)
> >  	 */
> >  	n_subbufs = 8;
> > 
> > +	if (!guc->dbgfs_node)
> > +		return -ENOENT;
> > +
> >  	guc_log_relay_chan = relay_open("guc_log",
> > -					i915->drm.primary->debugfs_root,
> > +					guc->dbgfs_node,
> >  					subbuf_size, n_subbufs,
> >  					&relay_callbacks, i915);
> >  	if (!guc_log_relay_chan) {
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_debugfs.c
> > b/drivers/gpu/drm/i915/gt/uc/intel_uc_debugfs.c
> > index 284d6fbc2d08c..2f93cc4e408a8 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_uc_debugfs.c
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_debugfs.c
> > @@ -54,6 +54,8 @@ void intel_uc_debugfs_register(struct intel_uc *uc, struct
> > dentry *gt_root)
> >  	if (IS_ERR(root))
> >  		return;
> > 
> > +	uc->guc.dbgfs_node = root;
> > +
> >  	intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), uc);
> > 
> >  	intel_guc_debugfs_register(&uc->guc, root);
> > --
> > 2.39.1
>