Re: [igt-dev] [PATCH v19 1/6] include/drm-uapi: import i915_drm.h header file

[Andi Shyti <andi.shyti@intel.com>]

Hi Tvrtko,

> > This header file is imported in order to include the two new
> > ioctls DRM_IOCTL_I915_GEM_CONTEXT_SETPARAM,
> > DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM and DRM_IOCTL_I915_QUERY.
> > 
> > Signed-off-by: Andi Shyti <andi.shyti@intel.com>
> > ---
> >   include/drm-uapi/i915_drm.h | 361 ++++++++++++++++++++++++++++++------
> >   1 file changed, 304 insertions(+), 57 deletions(-)
> > 
> > diff --git a/include/drm-uapi/i915_drm.h b/include/drm-uapi/i915_drm.h
> > index 4ae1c6ff6ae6..2bbad08eb9d2 100644
> > --- a/include/drm-uapi/i915_drm.h
> > +++ b/include/drm-uapi/i915_drm.h
> > @@ -62,6 +62,26 @@ extern "C" {
> >   #define I915_ERROR_UEVENT		"ERROR"
> >   #define I915_RESET_UEVENT		"RESET"
> > +/*
> > + * i915_user_extension: Base class for defining a chain of extensions
> > + *
> > + * Many interfaces need to grow over time. In most cases we can simply
> > + * extend the struct and have userspace pass in more data. Another option,
> > + * as demonstrated by Vulkan's approach to providing extensions for forward
> > + * and backward compatibility, is to use a list of optional structs to
> > + * provide those extra details.
> > + *
> > + * The key advantage to using an extension chain is that it allows us to
> > + * redefine the interface more easily than an ever growing struct of
> > + * increasing complexity, and for large parts of that interface to be
> > + * entirely optional. The downside is more pointer chasing; chasing across
> > + * the boundary with pointers encapsulated inside u64.
> > + */
> > +struct i915_user_extension {
> > +	__u64 next_extension;
> > +	__u64 name;
> > +};
> 
> Just a note to not merge this version since my branch has accidentally
> diverged from latest drm-tip in this respect.

yes, it slipped off my mind. Do you have any plans to rebase your
branch? I would send the patches today.

Andi
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