linux-kernel - Re: [PATCH drm-misc-next v8 03/12] drm/gpuvm: export drm_gpuvm_range

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Date:   Thu, 02 Nov 2023 14:20:08 +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 03/12] drm/gpuvm: export
 drm_gpuvm_range_valid()

On Thu, 2023-11-02 at 00:30 +0100, Danilo Krummrich wrote:
> Drivers may use this function to validate userspace requests in
> advance,
> hence export it.
> 
> Signed-off-by: Danilo Krummrich <dakr@...hat.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>

> ---
>  drivers/gpu/drm/drm_gpuvm.c | 14 +++++++++++++-
>  include/drm/drm_gpuvm.h     |  1 +
>  2 files changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_gpuvm.c
> b/drivers/gpu/drm/drm_gpuvm.c
> index 445767f8fbc4..2669f9bbc377 100644
> --- a/drivers/gpu/drm/drm_gpuvm.c
> +++ b/drivers/gpu/drm/drm_gpuvm.c
> @@ -649,7 +649,18 @@ drm_gpuvm_in_kernel_node(struct drm_gpuvm
> *gpuvm, u64 addr, u64 range)
>         return krange && addr < kend && kstart < end;
>  }
>  
> -static bool
> +/**
> + * drm_gpuvm_range_valid() - checks whether the given range is valid
> for the
> + * given &drm_gpuvm
> + * @gpuvm: the GPUVM to check the range for
> + * @addr: the base address
> + * @range: the range starting from the base address
> + *
> + * Checks whether the range is within the GPUVM's managed
> boundaries.
> + *
> + * Returns: true for a valid range, false otherwise
> + */
> +bool
>  drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm,
>                       u64 addr, u64 range)
>  {
> @@ -657,6 +668,7 @@ drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm,
>                drm_gpuvm_in_mm_range(gpuvm, addr, range) &&
>                !drm_gpuvm_in_kernel_node(gpuvm, addr, range);
>  }
> +EXPORT_SYMBOL_GPL(drm_gpuvm_range_valid);
>  
>  /**
>   * drm_gpuvm_init() - initialize a &drm_gpuvm
> diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
> index 687fd5893624..13eac6f70061 100644
> --- a/include/drm/drm_gpuvm.h
> +++ b/include/drm/drm_gpuvm.h
> @@ -253,6 +253,7 @@ void drm_gpuvm_init(struct drm_gpuvm *gpuvm,
> const char *name,
>                     const struct drm_gpuvm_ops *ops);
>  void drm_gpuvm_destroy(struct drm_gpuvm *gpuvm);
>  
> +bool drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm, u64 addr, u64
> range);
>  bool drm_gpuvm_interval_empty(struct drm_gpuvm *gpuvm, u64 addr, u64
> range);
>  
>  static inline struct drm_gpuva *