linux-kernel - Re: [PATCH v6 1/2] habanalabs: define uAPI to export FD for DMA-BUF

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Date:   Tue, 28 Sep 2021 22:12:45 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christian König <christian.koenig@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Gal Pressman <galpress@...zon.com>,
        Yossi Leybovich <sleybo@...zon.com>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Doug Ledford <dledford@...hat.com>,
        Dave Airlie <airlied@...il.com>,
        Alex Deucher <alexander.deucher@....com>,
        Leon Romanovsky <leonro@...dia.com>,
        Christoph Hellwig <hch@....de>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>
Subject: Re: [PATCH v6 1/2] habanalabs: define uAPI to export FD for DMA-BUF

On Tue, Sep 28, 2021 at 8:13 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Sun, Sep 12, 2021 at 07:53:08PM +0300, Oded Gabbay wrote:
> >       /* HL_MEM_OP_* */
> >       __u32 op;
> > -     /* HL_MEM_* flags */
> > +     /* HL_MEM_* flags.
> > +      * For the HL_MEM_OP_EXPORT_DMABUF_FD opcode, this field holds the
> > +      * DMA-BUF file/FD flags.
> > +      */
> >       __u32 flags;
> >       /* Context ID - Currently not in use */
> >       __u32 ctx_id;
> > @@ -1072,6 +1091,13 @@ struct hl_mem_out {
> >
> >                       __u32 pad;
> >               };
> > +
> > +             /* Returned in HL_MEM_OP_EXPORT_DMABUF_FD. Represents the
> > +              * DMA-BUF object that was created to describe a memory
> > +              * allocation on the device's memory space. The FD should be
> > +              * passed to the importer driver
> > +              */
> > +             __u64 fd;
>
> fd's should be a s32 type in a fixed width uapi.
Yep, will correct this.

>
> I usually expect to see the uapi changes inside the commit that
> consumes them, splitting the patch like this seems strange but
> harmless.
I'll remember that when I send the RDMA patches down the road :)

Thanks,
Oded
>
> Jason