Re: [Intel-gfx] [PATCH 14/44] drm/v3d: Delete v3d_dev->pdev

[Sam Ravnborg <sam@ravnborg.org>]

Hi Daniel.

On Fri, Apr 03, 2020 at 03:57:58PM +0200, Daniel Vetter wrote:
> We already have it in v3d_dev->drm.dev with zero additional pointer
> chasing. Personally I don't like duplicated pointers like this
> because:
> - reviewers need to check whether the pointer is for the same or
> different objects if there's multiple
> - compilers have an easier time too
> 
> To avoid having to pull in some big headers I implemented the casting
> function as a macro instead of a static inline.
Hmm...

> Typechecking thanks to
> container_of still assured.
> 
> But also a bit a bikeshed, so feel free to ignore.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Eric Anholt <eric@anholt.net>

This and patch 13 has same subject - confusing.

	Sam

> ---
>  drivers/gpu/drm/v3d/v3d_drv.c | 3 +--
>  drivers/gpu/drm/v3d/v3d_drv.h | 3 ++-
>  drivers/gpu/drm/v3d/v3d_irq.c | 8 +++++---
>  3 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
> index 37cb880f2826..82a7dfdd14c2 100644
> --- a/drivers/gpu/drm/v3d/v3d_drv.c
> +++ b/drivers/gpu/drm/v3d/v3d_drv.c
> @@ -235,7 +235,7 @@ static int
>  map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name)
>  {
>  	struct resource *res =
> -		platform_get_resource_byname(v3d->pdev, IORESOURCE_MEM, name);
> +		platform_get_resource_byname(v3d_to_pdev(v3d), IORESOURCE_MEM, name);
>  
>  	*regs = devm_ioremap_resource(v3d->drm.dev, res);
>  	return PTR_ERR_OR_ZERO(*regs);
> @@ -255,7 +255,6 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
>  	if (IS_ERR(v3d))
>  		return PTR_ERR(v3d);
>  
> -	v3d->pdev = pdev;
>  	drm = &v3d->drm;
>  
>  	platform_set_drvdata(pdev, drm);
> diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
> index 4d2d1f2fe1af..935f23b524b2 100644
> --- a/drivers/gpu/drm/v3d/v3d_drv.h
> +++ b/drivers/gpu/drm/v3d/v3d_drv.h
> @@ -46,7 +46,6 @@ struct v3d_dev {
>  	int ver;
>  	bool single_irq_line;
>  
> -	struct platform_device *pdev;
>  	void __iomem *hub_regs;
>  	void __iomem *core_regs[3];
>  	void __iomem *bridge_regs;
> @@ -128,6 +127,8 @@ v3d_has_csd(struct v3d_dev *v3d)
>  	return v3d->ver >= 41;
>  }
>  
> +#define v3d_to_pdev(v3d) to_platform_device(v3d->drm.dev)
> +
>  /* The per-fd struct, which tracks the MMU mappings. */
>  struct v3d_file_priv {
>  	struct v3d_dev *v3d;
> diff --git a/drivers/gpu/drm/v3d/v3d_irq.c b/drivers/gpu/drm/v3d/v3d_irq.c
> index f4ce6d057c90..51b65263c657 100644
> --- a/drivers/gpu/drm/v3d/v3d_irq.c
> +++ b/drivers/gpu/drm/v3d/v3d_irq.c
> @@ -217,7 +217,7 @@ v3d_irq_init(struct v3d_dev *v3d)
>  		V3D_CORE_WRITE(core, V3D_CTL_INT_CLR, V3D_CORE_IRQS);
>  	V3D_WRITE(V3D_HUB_INT_CLR, V3D_HUB_IRQS);
>  
> -	irq1 = platform_get_irq(v3d->pdev, 1);
> +	irq1 = platform_get_irq(v3d_to_pdev(v3d), 1);
>  	if (irq1 == -EPROBE_DEFER)
>  		return irq1;
>  	if (irq1 > 0) {
> @@ -226,7 +226,8 @@ v3d_irq_init(struct v3d_dev *v3d)
>  				       "v3d_core0", v3d);
>  		if (ret)
>  			goto fail;
> -		ret = devm_request_irq(v3d->drm.dev, platform_get_irq(v3d->pdev, 0),
> +		ret = devm_request_irq(v3d->drm.dev,
> +				       platform_get_irq(v3d_to_pdev(v3d), 0),
>  				       v3d_hub_irq, IRQF_SHARED,
>  				       "v3d_hub", v3d);
>  		if (ret)
> @@ -234,7 +235,8 @@ v3d_irq_init(struct v3d_dev *v3d)
>  	} else {
>  		v3d->single_irq_line = true;
>  
> -		ret = devm_request_irq(v3d->drm.dev, platform_get_irq(v3d->pdev, 0),
> +		ret = devm_request_irq(v3d->drm.dev,
> +				       platform_get_irq(v3d_to_pdev(v3d), 0),
>  				       v3d_irq, IRQF_SHARED,
>  				       "v3d", v3d);
>  		if (ret)
> -- 
> 2.25.1
> 
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