linux-kernel - Re: [PATCH v2 10/10] drm/msm: Add a way for userspace to allocate GPU iova

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Date:   Thu, 31 Mar 2022 12:54:06 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Jonathan Marek <jonathan@...ek.ca>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Emma Anholt <emma@...olt.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 10/10] drm/msm: Add a way for userspace to allocate GPU iova

On Thu, Mar 31, 2022 at 12:41 PM Dmitry Osipenko
<dmitry.osipenko@...labora.com> wrote:
>
> On 3/31/22 22:02, Rob Clark wrote:
> > On Thu, Mar 31, 2022 at 11:52 AM Dmitry Osipenko
> > <dmitry.osipenko@...labora.com> wrote:
> >>
> >> ...
> >>> +/*
> >>> + * Get the requested iova but don't pin it.  Fails if the requested iova is
> >>> + * not available.  Doesn't need a put because iovas are currently valid for
> >>> + * the life of the object.
> >>> + *
> >>> + * Setting an iova of zero will clear the vma.
> >>> + */
> >>> +int msm_gem_set_iova(struct drm_gem_object *obj,
> >>> +                  struct msm_gem_address_space *aspace, uint64_t iova)
> >>> +{
> >>> +     int ret = 0;
> >>
> >> nit: No need to initialize the ret
> >
> > actually, we do
>
> Indeed, sorry :)
>
> ...
> >>>  int msm_gem_get_and_pin_iova_range(struct drm_gem_object *obj,
> >>>               struct msm_gem_address_space *aspace, uint64_t *iova,
> >>>               u64 range_start, u64 range_end);
> >> nit: There is an odd mix of uint64_t and u64 (and alike) in the MSM code
> >> :) The uint64_t variant shouldn't be used by kernel code in general and
> >> checkpatch should want about it.
> >
> > one of many things that I disagree with checkpatch about ;-)
> >
> > I prefer standard types to custom ones.  I _kinda_ get the argument in
> > case of uapi (but IMHO that doesn't apply to how drm uapi headers are
> > used)
>
> I'd understand if it was all either uint64_t or u64, but the mix.. hm.

yeah, fair, we could be a bit more consistent

BR,
-R