From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3A975F8D755 for ; Thu, 16 Apr 2026 15:02:19 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7579110E8E3; Thu, 16 Apr 2026 15:02:18 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="qhrioTF/"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6D11A10E8D7 for ; Thu, 16 Apr 2026 15:02:17 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 995FF60126; Thu, 16 Apr 2026 15:02:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A1577C2BCAF; Thu, 16 Apr 2026 15:02:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776351736; bh=LajyyeXFg0XU7KHL5KLjvwU6v+hIuEgmiN/u26dKcZQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=qhrioTF/nUjIILQb/3ks6P0iT3MY7XHIdCg5esBsxcB9DKnAPPpVrJPlX3sD5gUKA r1stjtKNE7NEaVw92sCphwGdE1kEG7RU6HK7IWwLM5zpB4cN/eOYx/YdtWIGkq+DEo ZtiZ65/wa/OHPGfVLNyY7C+5m+2NXaWuTX0H2RJ3/ekra7k+OrgzmLOl5779IlP6P6 ZnDxgbM3U0VKyzMs22S510AJBtZCWhZCHl4u0YMfbUHaY1S3y79rWag7tfg8FhRb3O n0wYxe3r1UIlVCveqjjNdOtww3HUnZl1OTfGgGINPFruG2qjku8oZkI7DSeq4m6RNk +eOg0KAns6Trw== Date: Thu, 16 Apr 2026 18:02:11 +0300 From: Leon Romanovsky To: Keith Busch Cc: Zhiping Zhang , Jason Gunthorpe , Bjorn Helgaas , linux-rdma@vger.kernel.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, Yochai Cohen , Yishai Hadas , Bjorn Helgaas Subject: Re: [RFC v2 1/2] vfio: add callback to get tph info for dmabuf Message-ID: <20260416150211.GG361495@unreal> References: <20260331083758.GA814676@unreal> <20260331132942.GC814676@unreal> <20260331140309.GH814676@unreal> <20260331190220.GI814676@unreal> <20260409120415.GF86584@unreal> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Tue, Apr 14, 2026 at 11:34:14AM -0600, Keith Busch wrote: > On Thu, Apr 09, 2026 at 03:04:15PM +0300, Leon Romanovsky wrote: > > Something like that, on top of this proposal: > > ... > > > +struct vfio_region_dma_tph { > > + u16 tag; > > + u8 ph; > > +}; > > + > > struct vfio_region_dma_range { > > - __u64 offset; > > - __u64 length; > > + union { > > + __u64 offset; > > + struct vfio_region_dma_tph tph; > > + }; > > + union { > > + __u64 length; > > + __u64 reserved; > > + }; > > +}; > > + > > +enum { > > + VFIO_DMABUF_FLAG_TPH = 1 << 0, > > }; > > Okay, so you have the hints as a separate action from the dmabuf > creation. I'm not sure I fully understood your point, but in my proposal the entire operation is done in one pass, with the hints provided as the final entry in the dma_range array. Thanks