linux-kernel - Re: [PATCH v2 3/4] drm/gem: rename struct drm_gem_dma_object.{paddr => dma

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Date:   Wed, 6 Jul 2022 20:28:29 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Danilo Krummrich <dakr@...hat.com>
Cc:     daniel@...ll.ch, airlied@...ux.ie, tzimmermann@...e.de,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] drm/gem: rename struct drm_gem_dma_object.{paddr
 => dma_addr}

Hi Danilo,

Thank you for the patch.

On Wed, Jul 06, 2022 at 02:43:51PM +0200, Danilo Krummrich wrote:
> The field paddr of struct drm_gem_dma_object holds a DMA address, which
> might actually be a physical address. However, depending on the platform,
> it can also be a bus address or a virtual address managed by an IOMMU.
> 
> Hence, rename the field to dma_addr, which is more applicable.
> 
> Since 'paddr' is a very commonly used term and symbol name a simple regex
> does not do the trick. Instead, users of the struct were fixed up
> iteratively with a trial and error approach building with
> `make allyesconfig && make drivers/gpu/drm`.

Not for this patch as you've already done the work manually, but can I
recommend the excellent coccinelle tool ? Its semantic patches can very
easily rename structure members.

> Signed-off-by: Danilo Krummrich <dakr@...hat.com>
> ---
>  .../arm/display/komeda/komeda_framebuffer.c   |  4 ++--
>  drivers/gpu/drm/arm/malidp_mw.c               |  2 +-
>  drivers/gpu/drm/arm/malidp_planes.c           | 12 +++++-----
>  drivers/gpu/drm/aspeed/aspeed_gfx_crtc.c      |  2 +-
>  drivers/gpu/drm/drm_fb_dma_helper.c           | 10 ++++----
>  drivers/gpu/drm/drm_gem_dma_helper.c          | 23 +++++++++++--------
>  drivers/gpu/drm/imx/ipuv3-plane.c             |  6 ++---
>  drivers/gpu/drm/sprd/sprd_dpu.c               |  2 +-
>  drivers/gpu/drm/sun4i/sun8i_ui_layer.c        | 14 +++++------
>  drivers/gpu/drm/sun4i/sun8i_vi_layer.c        | 14 +++++------
>  drivers/gpu/drm/tidss/tidss_dispc.c           | 16 ++++++-------
>  drivers/gpu/drm/tiny/arcpgu.c                 |  2 +-
>  drivers/gpu/drm/vc4/vc4_bo.c                  |  2 +-
>  drivers/gpu/drm/vc4/vc4_gem.c                 |  8 +++----
>  drivers/gpu/drm/vc4/vc4_irq.c                 |  2 +-
>  drivers/gpu/drm/vc4/vc4_plane.c               |  4 ++--
>  drivers/gpu/drm/vc4/vc4_render_cl.c           | 14 +++++------
>  drivers/gpu/drm/vc4/vc4_txp.c                 |  2 +-
>  drivers/gpu/drm/vc4/vc4_v3d.c                 |  4 ++--
>  drivers/gpu/drm/vc4/vc4_validate.c            | 12 +++++-----
>  include/drm/drm_gem_dma_helper.h              |  4 ++--
>  21 files changed, 81 insertions(+), 78 deletions(-)

[snip]

> diff --git a/drivers/gpu/drm/drm_gem_dma_helper.c b/drivers/gpu/drm/drm_gem_dma_helper.c
> index 56fc1a1e7f87..8851d294bb53 100644
> --- a/drivers/gpu/drm/drm_gem_dma_helper.c
> +++ b/drivers/gpu/drm/drm_gem_dma_helper.c

[snip]

> @@ -460,10 +461,11 @@ drm_gem_dma_prime_import_sg_table(struct drm_device *dev,
>  	if (IS_ERR(dma_obj))
>  		return ERR_CAST(dma_obj);
>  
> -	dma_obj->paddr = sg_dma_address(sgt->sgl);
> +	dma_obj->dma_addr = sg_dma_address(sgt->sgl);
>  	dma_obj->sgt = sgt;
>  
> -	DRM_DEBUG_PRIME("dma_addr = %pad, size = %zu\n", &dma_obj->paddr, attach->dmabuf->size);
> +	DRM_DEBUG_PRIME("dma_addr = %pad, size = %zu\n", &dma_obj->dma_addr,
> +							 attach->dmabuf->size);

The second line should be aligned left, just right of the opening
parenthesis.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

>  
>  	return &dma_obj->base;
>  }

[snip]

-- 
Regards,

Laurent Pinchart