[PATCH] drm/amdkfd: Initialize kfd_gpu_cache_info for KFD topology

[Deucher, Alexander]

[AMD Official Use Only - General]

> -----Original Message-----
> From: Kuehling, Felix <Felix.Kuehling at amd.com>
> Sent: Tuesday, February 6, 2024 4:15 PM
> To: Greathouse, Joseph <Joseph.Greathouse at amd.com>; amd-
> gfx at lists.freedesktop.org; Deucher, Alexander
> <Alexander.Deucher at amd.com>
> Subject: Re: [PATCH] drm/amdkfd: Initialize kfd_gpu_cache_info for KFD
> topology
>
>
> On 2024-02-06 15:55, Joseph Greathouse wrote:
> > The current kfd_gpu_cache_info structure is only partially filled in
> > for some architectures. This means that for devices where we do not
> > fill in some fields, we can returned uninitialized values through  the
> > KFD topology.
> > Zero out the kfd_gpu_cache_info before asking the remaining fields to
> > be filled in by lower-level functions.
> >
> > Signed-off-by: Joseph Greathouse <Joseph.Greathouse at amd.com>
>
> This fixes your previous patch "drm/amdkfd: Add cache line sizes to KFD
> topology". Alex, I think the previous patch hasn't gone upstream yet. Do you
> want a Fixes: tag or is is possible to squash this with Joe's previous patch
> before upstreaming?

Either way.  I can fix up the tag when we upstream or squash it.

Alex

>
> One nit-pick below.
>
>
> > ---
> >   drivers/gpu/drm/amd/amdkfd/kfd_topology.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> > b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> > index 3df2a8ad86fb..67c1e7f84750 100644
> > --- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> > @@ -1707,6 +1707,7 @@ static void kfd_fill_cache_non_crat_info(struct
> > kfd_topology_device *dev, struct
> >
> >     gpu_processor_id = dev->node_props.simd_id_base;
> >
> > +   memset(cache_info, 0, sizeof(struct kfd_gpu_cache_info) *
> > +KFD_MAX_CACHE_TYPES);
>
> Just use sizeof(cache_info). No need to calculate the size of the array and risk
> getting it wrong.
>
> Regards,
>    Felix
>
>
> >     pcache_info = cache_info;
> >     num_of_cache_types = kfd_get_gpu_cache_info(kdev, &pcache_info);
> >     if (!num_of_cache_types) {