Re: [PATCH v4 5/8] iommu/of: Introduce iommu_fwspec

[Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>]

On Fri, Jul 01, 2016 at 05:50:14PM +0100, Robin Murphy wrote:

[...]

> +int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
> +{
> +	struct iommu_fwspec *fwspec = dev->archdata.iommu;
> +	size_t size;
> +
> +	if (!fwspec)
> +		return -EINVAL;
> +
> +	size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + 1]);
								^^^^

+ num_ids ?

Lorenzo

> +	fwspec = krealloc(dev->archdata.iommu, size, GFP_KERNEL);
> +	if (!fwspec)
> +		return -ENOMEM;
> +
> +	while (num_ids--)
> +		fwspec->ids[fwspec->num_ids++] = *ids++;
> +
> +	dev->archdata.iommu = fwspec;
> +	return 0;
> +}
> +
> +inline struct iommu_fwspec *dev_iommu_fwspec(struct device *dev)
> +{
> +	return dev->archdata.iommu;
> +}
> diff --git a/include/linux/of_iommu.h b/include/linux/of_iommu.h
> index bd02b44902d0..308791fca32d 100644
> --- a/include/linux/of_iommu.h
> +++ b/include/linux/of_iommu.h
> @@ -15,6 +15,14 @@ extern void of_iommu_init(void);
>  extern const struct iommu_ops *of_iommu_configure(struct device *dev,
>  					struct device_node *master_np);
>  
> +struct iommu_fwspec {
> +	const struct iommu_ops	*iommu_ops;
> +	struct device_node	*iommu_np;
> +	void			*iommu_priv;
> +	unsigned int		num_ids;
> +	u32			ids[];
> +};
> +
>  #else
>  
>  static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
> @@ -31,8 +39,15 @@ static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
>  	return NULL;
>  }
>  
> +struct iommu_fwspec;
> +
>  #endif	/* CONFIG_OF_IOMMU */
>  
> +int iommu_fwspec_init(struct device *dev, struct device_node *iommu_np);
> +void iommu_fwspec_free(struct device *dev);
> +int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
> +struct iommu_fwspec *dev_iommu_fwspec(struct device *dev);
> +
>  void of_iommu_set_ops(struct device_node *np, const struct iommu_ops *ops);
>  const struct iommu_ops *of_iommu_get_ops(struct device_node *np);
>  
> -- 
> 2.8.1.dirty
> 
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