Re: [Intel-gfx] [PATCH 19/30] drm/i915: Add an i915_gem_vm_lookup helper

[Jani Nikula <jani.nikula@linux.intel.com>]

On Thu, 08 Jul 2021, Jason Ekstrand <jason@jlekstrand.net> wrote:
> This is the VM equivalent of i915_gem_context_lookup.  It's only used
> once in this patch but future patches will need to duplicate this lookup
> code so it's better to have it in a helper.
>
> Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

I'm looking at i915_drv.h.... and really, i915_drv.h is not your dumping
ground. None of this belongs in i915_drv.h.

BR,
Jani.


> ---
>  drivers/gpu/drm/i915/gem/i915_gem_context.c |  6 +-----
>  drivers/gpu/drm/i915/i915_drv.h             | 14 ++++++++++++++
>  2 files changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> index 206721dccd24e..3c59d1e4080c4 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> @@ -1311,11 +1311,7 @@ static int set_ppgtt(struct drm_i915_file_private *file_priv,
>  	if (upper_32_bits(args->value))
>  		return -ENOENT;
>  
> -	rcu_read_lock();
> -	vm = xa_load(&file_priv->vm_xa, args->value);
> -	if (vm && !kref_get_unless_zero(&vm->ref))
> -		vm = NULL;
> -	rcu_read_unlock();
> +	vm = i915_gem_vm_lookup(file_priv, args->value);
>  	if (!vm)
>  		return -ENOENT;
>  
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index ae45ea7b26997..8c1994c16b920 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1867,6 +1867,20 @@ i915_gem_context_lookup(struct drm_i915_file_private *file_priv, u32 id)
>  	return ctx;
>  }
>  
> +static inline struct i915_address_space *
> +i915_gem_vm_lookup(struct drm_i915_file_private *file_priv, u32 id)
> +{
> +	struct i915_address_space *vm;
> +
> +	rcu_read_lock();
> +	vm = xa_load(&file_priv->vm_xa, id);
> +	if (vm && !kref_get_unless_zero(&vm->ref))
> +		vm = NULL;
> +	rcu_read_unlock();
> +
> +	return vm;
> +}
> +
>  /* i915_gem_evict.c */
>  int __must_check i915_gem_evict_something(struct i915_address_space *vm,
>  					  u64 min_size, u64 alignment,

-- 
Jani Nikula, Intel Open Source Graphics Center