On Fri, Aug 12, 2016 at 01:43:52PM +0100, Dave Gordon wrote:
> On 12/08/16 12:20, David Weinehall wrote:
> > drm/i915: debugfs spring cleaning
> >
> > Just like with sysfs, we do some major overhaul.
> >
> > Pass dev_priv instead of dev to all feature macros (IS_, HAS_,
> > INTEL_, etc.). This has the side effect that a bunch of functions
> > now get dev_priv passed instead of dev.
> >
> > All calls to INTEL_INFO()->gen have been replaced with
> > INTEL_GEN().
> >
> > We want access to to_i915(node->minor->dev) in a lot of places,
> > so add the node_to_i915() helper to accomodate for this.
> >
> > Finally, we have quite a few cases where we get a void * pointer,
> > and need to cast it to drm_device *, only to run to_i915() on it.
> > Add cast_to_i915() to do this.
> >
> > v2: Don't introduce extra dev (Chris)
> >
> > v3: Make pipe_crc_info have a pointer to drm_i915_private instead of
> > drm_device. This saves a bit of space, since we never use
> > drm_device anywhere in these functions.
> >
> > Also some minor fixup that I missed in the previous version.
> >
> > Signed-off-by: David Weinehall <david.weinehall@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/i915_debugfs.c | 749 ++++++++++++++++--------------------
> > drivers/gpu/drm/i915/i915_drv.c | 2 +-
> > drivers/gpu/drm/i915/i915_drv.h | 8 +-
> > 3 files changed, 342 insertions(+), 417 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 3eee5d1255f6..07bceac64e6d 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -46,6 +46,11 @@ enum {
> > PINNED_LIST,
> > };
> >
> > +static inline struct drm_i915_private *node_to_i915(struct drm_info_node *node)
> > +{
> > + return to_i915(node->minor->dev);
> > +}
>
> Alternatively (noting that almost the only use we make of this drm_info_node
> is to indirect multiple times to get dev_priv), we could change what is
> stored in (struct seq_file).private to make it more convenient and/or
> efficient. For example,
>
> struct i915_debugfs_node {
> struct drm_i915_private *dev_priv;
> struct drm_info_node drm_info; // if still required
> };
>
> thus eliminating several memory cycles per use for a cost of one word extra
> data per debugfs node.
Well, the memory cycles / use isn't really that important for debugfs
(or sysfs, for that matter). Memory consumption, however, always
affects us. Still, I admit that having the nodes provide dev_priv
directly would definitely be nice. I'll give your suggestion a whirl and
see how big the overhead would be.
Kind regards, David
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