linux-kernel - Re: [PATCH v3 2/2] dma: add IOMMU static calls with clear default ops

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Message-ID: <20240722151037.GA25001@lst.de>
Date: Mon, 22 Jul 2024 17:10:37 +0200
From: Christoph Hellwig <hch@....de>
To: Leon Romanovsky <leon@...nel.org>
Cc: Christoph Hellwig <hch@....de>, Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Leon Romanovsky <leonro@...dia.com>,
	Easwar Hariharan <eahariha@...ux.microsoft.com>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	Jason Gunthorpe <jgg@...dia.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v3 2/2] dma: add IOMMU static calls with clear default
 ops

On Sun, Jul 21, 2024 at 10:49:11AM +0300, Leon Romanovsky wrote:
> -static void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
> -		struct sg_table *sgt, enum dma_data_direction dir)
> +void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
> +				  struct sg_table *sgt,
> +				  enum dma_data_direction dir)

Why are you reformatting these to a much less readable coding style?

> +static inline struct page *
> +dma_common_alloc_pages(struct device *dev, size_t size, dma_addr_t *dma_handle,
> +		       enum dma_data_direction dir, gfp_t gfp)
> +{
> +	return NULL;
> +}
> +static inline void dma_common_free_pages(struct device *dev, size_t size,
> +					 struct page *vaddr,
> +					 dma_addr_t dma_handle,
> +					 enum dma_data_direction dir)
> +{
> +}

dma-iommu very much depends on these.  So we'll need to also
build ops_helpers.o if dma-iommu is enabled.  So we'll probably need
a separate Kconfig option for it that the various users select.