linux-kernel - Re: [PATCH drm-misc-next v8 02/12] drm/gpuvm: don't always WARN in drm_gpuvm_check

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Message-ID: <754fd9054f5021edaa92232d457760bcd6ac083e.camel@linux.intel.com>
Date:   Thu, 02 Nov 2023 14:19:08 +0100
From:   Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>
To:     Danilo Krummrich <dakr@...hat.com>, airlied@...il.com,
        daniel@...ll.ch, matthew.brost@...el.com, sarah.walker@...tec.com,
        donald.robson@...tec.com, boris.brezillon@...labora.com,
        christian.koenig@....com, faith@...strand.net
Cc:     dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH drm-misc-next v8 02/12] drm/gpuvm: don't always WARN in
 drm_gpuvm_check_overflow()

On Thu, 2023-11-02 at 00:30 +0100, Danilo Krummrich wrote:
> Don't always WARN in drm_gpuvm_check_overflow() and separate it into
> a
> drm_gpuvm_check_overflow() and a dedicated
> drm_gpuvm_warn_check_overflow() variant.
> 
> This avoids printing warnings due to invalid userspace requests.
> 
> Signed-off-by: Danilo Krummrich <dakr@...hat.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>

> ---
>  drivers/gpu/drm/drm_gpuvm.c | 20 +++++++++++++-------
>  1 file changed, 13 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gpuvm.c
> b/drivers/gpu/drm/drm_gpuvm.c
> index d7367a202fee..445767f8fbc4 100644
> --- a/drivers/gpu/drm/drm_gpuvm.c
> +++ b/drivers/gpu/drm/drm_gpuvm.c
> @@ -614,12 +614,18 @@ static int __drm_gpuva_insert(struct drm_gpuvm
> *gpuvm,
>  static void __drm_gpuva_remove(struct drm_gpuva *va);
>  
>  static bool
> -drm_gpuvm_check_overflow(struct drm_gpuvm *gpuvm, u64 addr, u64
> range)
> +drm_gpuvm_check_overflow(u64 addr, u64 range)
>  {
>         u64 end;
>  
> -       return drm_WARN(gpuvm->drm, check_add_overflow(addr, range,
> &end),
> -                       "GPUVA address limited to %zu bytes.\n",
> sizeof(end));
> +       return check_add_overflow(addr, range, &end);
> +}
> +
> +static bool
> +drm_gpuvm_warn_check_overflow(struct drm_gpuvm *gpuvm, u64 addr, u64
> range)
> +{
> +       return drm_WARN(gpuvm->drm, drm_gpuvm_check_overflow(addr,
> range),
> +                       "GPUVA address limited to %zu bytes.\n",
> sizeof(addr));
>  }
>  
>  static bool
> @@ -647,7 +653,7 @@ static bool
>  drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm,
>                       u64 addr, u64 range)
>  {
> -       return !drm_gpuvm_check_overflow(gpuvm, addr, range) &&
> +       return !drm_gpuvm_check_overflow(addr, range) &&
>                drm_gpuvm_in_mm_range(gpuvm, addr, range) &&
>                !drm_gpuvm_in_kernel_node(gpuvm, addr, range);
>  }
> @@ -682,7 +688,7 @@ drm_gpuvm_init(struct drm_gpuvm *gpuvm, const
> char *name,
>         gpuvm->ops = ops;
>         gpuvm->drm = drm;
>  
> -       drm_gpuvm_check_overflow(gpuvm, start_offset, range);
> +       drm_gpuvm_warn_check_overflow(gpuvm, start_offset, range);
>         gpuvm->mm_start = start_offset;
>         gpuvm->mm_range = range;
>  
> @@ -691,8 +697,8 @@ drm_gpuvm_init(struct drm_gpuvm *gpuvm, const
> char *name,
>                 gpuvm->kernel_alloc_node.va.addr = reserve_offset;
>                 gpuvm->kernel_alloc_node.va.range = reserve_range;
>  
> -               if (likely(!drm_gpuvm_check_overflow(gpuvm,
> reserve_offset,
> -                                                    reserve_range)))
> +               if (likely(!drm_gpuvm_warn_check_overflow(gpuvm,
> reserve_offset,
> +                                                        
> reserve_range)))
>                         __drm_gpuva_insert(gpuvm, &gpuvm-
> >kernel_alloc_node);
>         }
>  }