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[142.162.112.119]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8c6a724a484sm800372485a.33.2026.01.19.08.24.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Jan 2026 08:24:25 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vhs3E-00000005I0S-2Krj; Mon, 19 Jan 2026 12:24:24 -0400 Date: Mon, 19 Jan 2026 12:24:24 -0400 From: Jason Gunthorpe To: Thomas =?utf-8?Q?Hellstr=C3=B6m?= Cc: Leon Romanovsky , Sumit Semwal , Christian =?utf-8?B?S8O2bmln?= , Alex Deucher , David Airlie , Simona Vetter , Gerd Hoffmann , Dmitry Osipenko , Gurchetan Singh , Chia-I Wu , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Lucas De Marchi , Rodrigo Vivi , Kevin Tian , Joerg Roedel , Will Deacon , Robin Murphy , Alex Williamson , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, virtualization@lists.linux.dev, intel-xe@lists.freedesktop.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, kvm@vger.kernel.org Subject: Re: [PATCH v2 0/4] dma-buf: document revoke mechanism to invalidate shared buffers Message-ID: <20260119162424.GE961572@ziepe.ca> References: <20260118-dmabuf-revoke-v2-0-a03bb27c0875@nvidia.com> <20260119075229.GE13201@unreal> <9112a605d2ee382e83b84b50c052dd9e4a79a364.camel@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <9112a605d2ee382e83b84b50c052dd9e4a79a364.camel@linux.intel.com> On Mon, Jan 19, 2026 at 10:27:00AM +0100, Thomas Hellström wrote: > this sounds like it's not just undocumented but also in some cases > unimplemented. The xe driver for one doesn't expect move_notify() to be > called on pinned buffers, so if that is indeed going to be part of the > dma-buf protocol, wouldn't support for that need to be advertised by > the importer? Can you clarify this? I don't see xe's importer calling dma_buf_pin() or dma_buf_attach() outside of tests? It's importer implements a fully functional looking dynamic attach with move_notify()? I see the exporer is checking for pinned and then not calling move_notify - is that what you mean? When I looked through all the importers only RDMA obviously didn't support move_notify on pinned buffers. Jason