Re: [PATCH v3] drm/xe/oa: Fix kernel doc warnings in xe_drm.h

["Dixit, Ashutosh" <ashutosh.dixit@intel.com>]

On Mon, 24 Jun 2024 05:30:37 -0700, Michal Wajdeczko wrote:
>

Hi Michal,

And Cc: Jose below.

>
>
> On 23.06.2024 22:31, Ashutosh Dixit wrote:
> > Fix kernel doc warnings in xe_drm.h. Also eliminate private/non-abi enum
> > definitions.
> >
> > v2: Remove __DRM_XE_PERF_TYPE_MAX since it is unused (Michal)
> > v3: Also remove DRM_XE_OA_PROPERTY_MAX since it can also be eliminated (Michal)
> >
> > Suggested-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
> > Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
>
> some nits below, but in general LGTM, so
>
> Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>

Thanks.

>
> and I'm assuming it's not too late for such uabi fixups, but better to
> wait for ack from Rodrigo

Copying Jose: in case Mesa were using DRM_XE_OA_PROPERTY_MAX, they can
probably also use a value like 16 like we've done below in Xe (I will make
this change in IGT). Mesa PR is not merged yet so should be ok I think, but
they will need to make a tiny change. I am assuming as long as this all
gets into 6.11 it should be ok.

Jose please confirm this is ok. Thanks.

>
> > ---
> >  drivers/gpu/drm/xe/xe_oa.c | 3 ++-
> >  include/uapi/drm/xe_drm.h  | 5 +----
> >  2 files changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/xe/xe_oa.c b/drivers/gpu/drm/xe/xe_oa.c
> > index 4168b51cf7b5..9263ae9a864e 100644
> > --- a/drivers/gpu/drm/xe/xe_oa.c
> > +++ b/drivers/gpu/drm/xe/xe_oa.c
> > @@ -1684,6 +1684,7 @@ static const xe_oa_user_extension_fn xe_oa_user_extension_funcs[] = {
> >	[DRM_XE_OA_EXTENSION_SET_PROPERTY] = xe_oa_user_ext_set_property,
> >  };
> >
> > +#define MAX_USER_EXTENSIONS	16
>
> nit: maybe it's worth to put small comment saying this is our choice to
> limit number of nested user extensions we want to support (or at least
> this is how I understood this)
>
> nit: and this doesn't really look like OA specific limitation, so maybe
> it's time to promote MAX_USER_EXTENSIONS to some shared location to make
> it unified across driver

xe_exec_queue.c also uses a similar mechanism. But I think better to leave
them separate in different modules so that each module can tweak the value
to what is best for that module.

Thanks.
--
Ashutosh


>
> >  static int xe_oa_user_extensions(struct xe_oa *oa, u64 extension, int ext_number,
> >				 struct xe_oa_open_param *param)
> >  {
> > @@ -1692,7 +1693,7 @@ static int xe_oa_user_extensions(struct xe_oa *oa, u64 extension, int ext_number
> >	int err;
> >	u32 idx;
> >
> > -	if (XE_IOCTL_DBG(oa->xe, ext_number >= DRM_XE_OA_PROPERTY_MAX))
> > +	if (XE_IOCTL_DBG(oa->xe, ext_number >= MAX_USER_EXTENSIONS))
> >		return -E2BIG;
> >
> >	err = __copy_from_user(&ext, address, sizeof(ext));
> > diff --git a/include/uapi/drm/xe_drm.h b/include/uapi/drm/xe_drm.h
> > index 93e00be44b2d..b410553faa9b 100644
> > --- a/include/uapi/drm/xe_drm.h
> > +++ b/include/uapi/drm/xe_drm.h
> > @@ -1379,8 +1379,8 @@ struct drm_xe_wait_user_fence {
> >   * enum drm_xe_perf_type - Perf stream types
> >   */
> >  enum drm_xe_perf_type {
> > +	/** @DRM_XE_PERF_TYPE_OA: OA perf stream type */
> >	DRM_XE_PERF_TYPE_OA,
> > -	__DRM_XE_PERF_TYPE_MAX, /* non-ABI */
> >  };
> >
> >  /**
> > @@ -1611,9 +1611,6 @@ enum drm_xe_oa_property_id {
> >	 * pass along with @DRM_XE_OA_PROPERTY_EXEC_QUEUE_ID or will default to 0.
> >	 */
> >	DRM_XE_OA_PROPERTY_OA_ENGINE_INSTANCE,
> > -
> > -	/** @DRM_XE_OA_PROPERTY_MAX: non-ABI */
> > -	DRM_XE_OA_PROPERTY_MAX
> >  };
> >
> >  /**