linux-kernel - Re: [PATCH v2 7/7] iommu: Turn iova_cookie to dma-iommu private pointer

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Message-ID: <Z757lz6ucDE6Otix@Asurada-Nvidia>
Date: Tue, 25 Feb 2025 18:25:27 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <kevin.tian@...el.com>, <tglx@...utronix.de>, <maz@...nel.org>,
	<joro@...tes.org>, <will@...nel.org>, <robin.murphy@....com>,
	<shuah@...nel.org>, <iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
	<eric.auger@...hat.com>, <baolu.lu@...ux.intel.com>, <yi.l.liu@...el.com>,
	<yury.norov@...il.com>, <jacob.pan@...ux.microsoft.com>,
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v2 7/7] iommu: Turn iova_cookie to dma-iommu private
 pointer

On Fri, Feb 21, 2025 at 10:39:59AM -0400, Jason Gunthorpe wrote:
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 99dd72998cb7f7..082274e8ba6a3d 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -1534,12 +1534,16 @@ void iommu_debugfs_setup(void);
>  static inline void iommu_debugfs_setup(void) {}
>  #endif
>  
> -#ifdef CONFIG_IOMMU_DMA
> +#if defined(CONFIG_IOMMU_DMA) && IS_ENABLED(CONFIG_IRQ_MSI_IOMMU)
>  int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
> +void iommu_put_msi_cookie(struct iommu_domain *domain);
>  #else /* CONFIG_IOMMU_DMA */
>  static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
>  {
> -	return -ENODEV;
> +	return 0;

Should we keep the -ENODEV here for !CONFIG_IOMMU_DMA?

Nicolin