linux-kernel - Re: [PATCH v1 05/12] iommu: Introduce get_viommu_size and viommu

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Message-ID: <20250613134117.GD1174925@nvidia.com>
Date: Fri, 13 Jun 2025 10:41:17 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, will@...nel.org, robin.murphy@....com,
	joro@...tes.org, ddutile@...hat.com, yi.l.liu@...el.com,
	peterz@...radead.org, jsnitsel@...hat.com, praan@...gle.com,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
	baolu.lu@...ux.intel.com
Subject: Re: [PATCH v1 05/12] iommu: Introduce get_viommu_size and
 viommu_init ops

On Mon, Jun 09, 2025 at 10:13:28AM -0700, Nicolin Chen wrote:
> @@ -654,6 +665,10 @@ struct iommu_ops {
>  
>  	int (*def_domain_type)(struct device *dev);
>  
> +	int (*get_viommu_size)(enum iommu_viommu_type viommu_type,
> +			       struct device *dev, size_t *viommu_size);

I'd return the size in a size_t instead of using an output
pointer. Make 0 mean not supported..

Jason