linux-kernel - RE: [PATCH 1/6] iommu: Add new iommu op to get iommu hardware information

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Message-ID: <BN9PR11MB5276CB88298F97177A7AAF448CDE9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Fri, 10 Feb 2023 07:28:30 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>
CC:     "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "nicolinc@...dia.com" <nicolinc@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "yi.y.sun@...ux.intel.com" <yi.y.sun@...ux.intel.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
Subject: RE: [PATCH 1/6] iommu: Add new iommu op to get iommu hardware
 information

> From: Liu, Yi L <yi.l.liu@...el.com>
> Sent: Thursday, February 9, 2023 12:17 PM
> @@ -223,6 +224,11 @@ struct iommu_iotlb_gather {
>  /**
>   * struct iommu_ops - iommu ops and capabilities
>   * @capable: check capability
> + * @hw_info: IOMMU hardware capabilities. The type of the returned data
> is

is it 'info' or 'capability'?

> + *           defined in include/uapi/linux/iommufd.h. The data buffer is
> + *           allocated in the IOMMU driver and the caller should free it
> + *           after use. Return the data buffer if success, or ERR_PTR on
> + *	      failure.
>   * @domain_alloc: allocate iommu domain
>   * @probe_device: Add device to iommu driver handling
>   * @release_device: Remove device from iommu driver handling
> @@ -252,6 +258,7 @@ struct iommu_iotlb_gather {
>   */
>  struct iommu_ops {
>  	bool (*capable)(struct device *dev, enum iommu_cap);
> +	void *(*hw_info)(struct device *dev, u32 *length);
> 
>  	/* Domain allocation and freeing by the iommu driver */
>  	struct iommu_domain *(*domain_alloc)(unsigned
> iommu_domain_type);
> @@ -280,6 +287,7 @@ struct iommu_ops {
>  	void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid);
> 
>  	const struct iommu_domain_ops *default_domain_ops;
> +	enum iommu_device_data_type driver_type;

the enum is called 'device_data_type' while the field is called 'driver_type'.

btw this new field is not documented above.