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

[Nicolin Chen <nicolinc@nvidia.com>]

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