linux-kernel - Re: [PATCH v6 02/20] drm/gpuva_mgr: Helper to get range of unmap from a remap op.

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Message-ID: <87a5tygoyx.fsf@intel.com>
Date:   Thu, 07 Sep 2023 15:14:14 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Sarah Walker <sarah.walker@...tec.com>,
        dri-devel@...ts.freedesktop.org
Cc:     linux-doc@...r.kernel.org, hns@...delico.com,
        krzysztof.kozlowski+dt@...aro.org, matthew.brost@...el.com,
        corbet@....net, luben.tuikov@....com, dakr@...hat.com,
        donald.robson@...tec.com, devicetree@...r.kernel.org,
        conor+dt@...nel.org, mripard@...nel.org, matt.coster@...tec.com,
        robh+dt@...nel.org, faith.ekstrand@...labora.com,
        linux-kernel@...r.kernel.org, afd@...com,
        boris.brezillon@...labora.com, tzimmermann@...e.de,
        christian.koenig@....com
Subject: Re: [PATCH v6 02/20] drm/gpuva_mgr: Helper to get range of unmap
 from a remap op.

On Wed, 06 Sep 2023, Sarah Walker <sarah.walker@...tec.com> wrote:
> From: Donald Robson <donald.robson@...tec.com>
>
> Signed-off-by: Donald Robson <donald.robson@...tec.com>
> ---
>  include/drm/drm_gpuva_mgr.h | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
>
> diff --git a/include/drm/drm_gpuva_mgr.h b/include/drm/drm_gpuva_mgr.h
> index ed8d50200cc3..be7b3a6d7e67 100644
> --- a/include/drm/drm_gpuva_mgr.h
> +++ b/include/drm/drm_gpuva_mgr.h
> @@ -703,4 +703,31 @@ void drm_gpuva_remap(struct drm_gpuva *prev,
>  
>  void drm_gpuva_unmap(struct drm_gpuva_op_unmap *op);
>  
> +/**
> + * drm_gpuva_op_remap_get_unmap_range() - Helper to get the start and range of
> + * the unmap stage of a remap op.
> + * @op: Remap op.
> + * @start_addr: Output pointer for the start of the required unmap.
> + * @range: Output pointer for the length of the required unmap.
> + *
> + * These parameters can then be used by the caller to unmap memory pages that
> + * are no longer required.
> + */
> +static __always_inline void

IMO __always_inline *always* requires a justification in the commit
message.

BR,
Jani.


> +drm_gpuva_op_remap_get_unmap_range(const struct drm_gpuva_op_remap *op,
> +				   u64 *start_addr, u64 *range)
> +{
> +	const u64 va_start = op->prev ?
> +			     op->prev->va.addr + op->prev->va.range :
> +			     op->unmap->va->va.addr;
> +	const u64 va_end = op->next ?
> +			   op->next->va.addr :
> +			   op->unmap->va->va.addr + op->unmap->va->va.range;
> +
> +	if (start_addr)
> +		*start_addr = va_start;
> +	if (range)
> +		*range = va_end - va_start;
> +}
> +
>  #endif /* __DRM_GPUVA_MGR_H__ */

-- 
Jani Nikula, Intel Open Source Graphics Center