Re: [PATCH] drm/amdgpu: allocate large structures dynamically

[Alex Deucher]

On Tue, May 5, 2020 at 10:07 AM Christian KÃnig
<christian.koenig@xxxxxxx> wrote:
>
> Am 05.05.20 um 16:01 schrieb Arnd Bergmann:
> > After the structure was padded to 1024 bytes, it is no longer
> > suitable for being a local variable, as the function surpasses
> > the warning limit for 32-bit architectures:
> >
> > drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:587:5: error: stack frame size of 1072 bytes in function 'amdgpu_ras_feature_enable' [-Werror,-Wframe-larger-than=]
> > int amdgpu_ras_feature_enable(struct amdgpu_device *adev,
> >      ^
> >
> > Use kzalloc() instead to get it from the heap.
> >
> > Fixes: a0d254820f43 ("drm/amdgpu: update RAS TA to Host interface")
> > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
>
> Acked-by: Christian KÃnig <christian.koenig@xxxxxxx>

Applied.  Thanks!

Alex

>
> We have a bunch of those warnings in the DAL code as well.
>
> Christian.
>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 31 +++++++++++++++++--------
> >   1 file changed, 21 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> > index 538895cfd862..7348619253c7 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> > @@ -588,19 +588,23 @@ int amdgpu_ras_feature_enable(struct amdgpu_device *adev,
> >               struct ras_common_if *head, bool enable)
> >   {
> >       struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
> > -     union ta_ras_cmd_input info;
> > +     union ta_ras_cmd_input *info;
> >       int ret;
> >
> >       if (!con)
> >               return -EINVAL;
> >
> > +        info = kzalloc(sizeof(union ta_ras_cmd_input), GFP_KERNEL);
> > +     if (!info)
> > +             return -ENOMEM;
> > +
> >       if (!enable) {
> > -             info.disable_features = (struct ta_ras_disable_features_input) {
> > +             info->disable_features = (struct ta_ras_disable_features_input) {
> >                       .block_id =  amdgpu_ras_block_to_ta(head->block),
> >                       .error_type = amdgpu_ras_error_to_ta(head->type),
> >               };
> >       } else {
> > -             info.enable_features = (struct ta_ras_enable_features_input) {
> > +             info->enable_features = (struct ta_ras_enable_features_input) {
> >                       .block_id =  amdgpu_ras_block_to_ta(head->block),
> >                       .error_type = amdgpu_ras_error_to_ta(head->type),
> >               };
> > @@ -609,26 +613,33 @@ int amdgpu_ras_feature_enable(struct amdgpu_device *adev,
> >       /* Do not enable if it is not allowed. */
> >       WARN_ON(enable && !amdgpu_ras_is_feature_allowed(adev, head));
> >       /* Are we alerady in that state we are going to set? */
> > -     if (!(!!enable ^ !!amdgpu_ras_is_feature_enabled(adev, head)))
> > -             return 0;
> > +     if (!(!!enable ^ !!amdgpu_ras_is_feature_enabled(adev, head))) {
> > +             ret = 0;
> > +             goto out;
> > +     }
> >
> >       if (!amdgpu_ras_intr_triggered()) {
> > -             ret = psp_ras_enable_features(&adev->psp, &info, enable);
> > +             ret = psp_ras_enable_features(&adev->psp, info, enable);
> >               if (ret) {
> >                       amdgpu_ras_parse_status_code(adev,
> >                                                    enable ? "enable":"disable",
> >                                                    ras_block_str(head->block),
> >                                                   (enum ta_ras_status)ret);
> >                       if (ret == TA_RAS_STATUS__RESET_NEEDED)
> > -                             return -EAGAIN;
> > -                     return -EINVAL;
> > +                             ret = -EAGAIN;
> > +                     else
> > +                             ret = -EINVAL;
> > +
> > +                     goto out;
> >               }
> >       }
> >
> >       /* setup the obj */
> >       __amdgpu_ras_feature_enable(adev, head, enable);
> > -
> > -     return 0;
> > +     ret = 0;
> > +out:
> > +     kfree(info);
> > +     return ret;
> >   }
> >
> >   /* Only used in device probe stage and called only once. */
>
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