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Date:   Wed, 6 Dec 2023 14:33:00 -0400
From:   Jason Gunthorpe <jgg@nvidia.com>
To:     Yi Liu <yi.l.liu@intel.com>
Cc:     joro@8bytes.org, alex.williamson@redhat.com, kevin.tian@intel.com,
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        shameerali.kolothum.thodi@huawei.com, lulu@redhat.com,
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        zhenzhong.duan@intel.com, joao.m.martins@oracle.com,
        xin.zeng@intel.com, yan.y.zhao@intel.com
Subject: Re: [PATCH v6 2/6] iommufd: Add IOMMU_HWPT_INVALIDATE
Message-ID: <20231206183300.GA2692119@nvidia.com>
References: <20231117130717.19875-1-yi.l.liu@intel.com>
 <20231117130717.19875-3-yi.l.liu@intel.com>
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On Fri, Nov 17, 2023 at 05:07:13AM -0800, Yi Liu wrote:
> +/**
> + * struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE)
> + * @size: sizeof(struct iommu_hwpt_invalidate)
> + * @hwpt_id: HWPT ID of a nested HWPT for cache invalidation
> + * @reqs_uptr: User pointer to an array having @req_num of cache invalidation
> + *             requests. The request entries in the array are of fixed width
> + *             @req_len, and contain a user data structure for invalidation
> + *             request specific to the given hardware page table.
> + * @req_type: One of enum iommu_hwpt_data_type, defining the data type of all
> + *            the entries in the invalidation request array. It should suit
> + *            with the data_type passed per the allocation of the hwpt pointed
> + *            by @hwpt_id.
> + * @req_len: Length (in bytes) of a request entry in the request array
> + * @req_num: Input the number of cache invalidation requests in the array.
> + *           Output the number of requests successfully handled by kernel.
> + * @out_driver_error_code: Report a driver speicifc error code upon failure.
> + *                         It's optional, driver has a choice to fill it or
> + *                         not.

"specific"

Jason