linux-kernel - RE: [PATCH RFCv1 12/14] iommufd: Add IOMMUFD_OBJ_VQUEUE and IOMMUFD_CMD_VQUEUE

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Message-ID: <BN9PR11MB527668B2398FE65771A429D08CF42@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Thu, 23 May 2024 06:57:15 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Jason Gunthorpe <jgg@...dia.com>, Nicolin Chen <nicolinc@...dia.com>
CC: "will@...nel.org" <will@...nel.org>, "robin.murphy@....com"
	<robin.murphy@....com>, "suravee.suthikulpanit@....com"
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	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
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	<linux-arm-kernel@...ts.infradead.org>, "linux-tegra@...r.kernel.org"
	<linux-tegra@...r.kernel.org>, "Liu, Yi L" <yi.l.liu@...el.com>,
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	<Dhaval.Giani@....com>, "shameerali.kolothum.thodi@...wei.com"
	<shameerali.kolothum.thodi@...wei.com>
Subject: RE: [PATCH RFCv1 12/14] iommufd: Add IOMMUFD_OBJ_VQUEUE and
 IOMMUFD_CMD_VQUEUE_ALLOC

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Sunday, May 12, 2024 11:02 PM
> 
> On Fri, Apr 12, 2024 at 08:47:09PM -0700, Nicolin Chen wrote:
> 
> > +/**
> > + * struct iommu_vqueue_alloc - ioctl(IOMMU_VQUEUE_ALLOC)
> > + * @size: sizeof(struct iommu_vqueue_alloc)
> > + * @flags: Must be 0
> > + * @viommu_id: viommu ID to associate the virtual queue with
> > + * @out_vqueue_id: The ID of the new virtual queue
> > + * @data_type: One of enum iommu_vqueue_data_type
> > + * @data_len: Length of the type specific data
> > + * @data_uptr: User pointer to the type specific data
> > + *
> > + * Allocate an virtual queue object for driver-specific HW-accelerated
> queue
> > + */
> > +
> > +struct iommu_vqueue_alloc {
> > +	__u32 size;
> > +	__u32 flags;
> > +	__u32 viommu_id;
> > +	__u32 out_vqueue_id;
> > +	__u32 data_type;
> > +	__u32 data_len;
> > +	__aligned_u64 data_uptr;
> 
> Some of the iommus will want an IPA here not a user pointer. I think
> it is fine API wise, we'd just add a flag to indicate data_uptr is an
> IPA.
> 

Presumably each driver will create its own type data which can
include any IPA field as vcmdq_base in this patch?