From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f47.google.com (mail-qv1-f47.google.com [209.85.219.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 32E2633290E for ; Tue, 20 Jan 2026 18:18:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768933104; cv=none; b=a7m0rJPc7k51Mg5E+N60xfI4i6uFlg8I7GroskIV29wilPP8FH5L3mpgZfl2regBZcsExLTkeDYOLRXyxFCikJvLGVc3OX4bgRiwlE/iEDYf2xG4LTzDUVHoFIFE4LlY1naCusQrv0cr0JC9ZIad7AfuLHZb5HzvxvSzI1NAkmU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768933104; c=relaxed/simple; bh=1L7c8BdoqxZUQDENcVXtZThUOiLDYDJQMPX7ZV7N9xw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=VN/rEZgT3qqbdSWi6TlpIYa+DuWmjm2rLnmTZoG+rttQzOKYiwuXHIfHNZvhdl6yCKe4nJvLZFcZdwaobNdaqVZdwpjaOTBibkRwlkgUsE9GLuPRCALbeNn7ZR6KIWApY/LT8dUK6Oap+zDYP7xXOXTOCmToqbt+Z5QV6qJnV1U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca; spf=pass smtp.mailfrom=ziepe.ca; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b=avpr/md1; arc=none smtp.client-ip=209.85.219.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="avpr/md1" Received: by mail-qv1-f47.google.com with SMTP id 6a1803df08f44-8946e32e534so4134436d6.3 for ; Tue, 20 Jan 2026 10:18:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1768933101; x=1769537901; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=UjKhtF6uFrGGz9QpG86rUrUwPRn2VxIJfZmcip97T7s=; b=avpr/md1vuSh2XL2Y1i36eqW+S83q+obfD0emf4zuMUEOWTKUhGkHKL1kBuO/4AA4f W9QufuzqG/TYMXy3og4z2kGtwGKV6nxnJ599X4VsETaXHkxFuSyJeAJPy26BrRWxaYVH 2XIWwSgQ7fawTZyHicTOzhS5EVRGiuoLmnZtDhzqtv8DWHSTgohszhgj4n1+u72Lh4lw McOIfV4bDsOfoP/QwKkT9K+9HEZb4y97ZRuhH17MhsjemlTigU+kSy0f7hP8/HTCALEV aFeOFilo/nvQBPaZQGrgLZ67PtGeO2rVh+hM9q1PGU4SW9YhZQR2tif19DBqz2VAN6Hb s+tA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768933101; x=1769537901; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UjKhtF6uFrGGz9QpG86rUrUwPRn2VxIJfZmcip97T7s=; b=qbFnbLTzSbsU43S+eVXyoWKDgagD6RaoggojJOGnqMv5fPiqqqYHNkb6HJ52+OdpXn 8bNfwwcxk5xD1fyxPEk8BvHC/vrZto8eNMaH5BxpEBzP/2pHuwoaZxFm5zQW/OQc0Y70 tgzI9b3USYuVPw40ZPQDbDVZgGHOLx2rk0fUaDO4g9bWVhws1HNn/iqV4lhZCkh6cO39 uPt1+C70suJavPRPXmPyZrZ56Xb5EQte/hwRRgDtf5kdsE2y18PUfXkRLnWtW6h/cTzk yd5FS7SCN2HxZOMGSQvWh7Ins7pI7oQZlxRhBPo9RVrnI9PinjKlYdXU3W0uzzo/UpDo JBwQ== X-Forwarded-Encrypted: i=1; AJvYcCVVO+nweVKMqoff0hS+yeBZM3gwRNXTCT9PI4Zc/Gz7PlNoZ7zN+lq8/TJQ6TXtbwt0ifrCoktRmetJVA==@vger.kernel.org X-Gm-Message-State: AOJu0Yx2x8sM2jQoz028oLLBQ5XsLX0whW38lxSXZIZPE7vvZeHkK7It YW3yo+WWDu8+C2/aabc6au9bYG4sQNi/5tF3cNAt/dxgLXoo/OKUxp5lajGCbX6BuqA= X-Gm-Gg: AZuq6aK26CX87x/R0q1kaEvIO/nLRwrY8W+xuOrlG+mAwhJLVkfcQCP5nGFFguUScNV qLtPmY36VubPTld8zTcsFWbHqW3vU0oysR9IpYGkox8vNWAqD1UaWSd3J9bQr2K6Q1Mo1h5MRKQ j7yO09LeI8sqoy4t55SCJqSJE8EXEk34jhThLXO/PzuQAgYgLnVJwkHRZbC7T6jZHXTp+QMcY93 +Wp9Q1EeQ89c3egcnk0rN6wljzXXDIczSjL3NGjEnFcDz34jzPxmB8CPvHcoWCjhGsCcm+SCirt 3yqAFu1Q2ganyRnV1VUoDMG+AjSKFzzM2EgYBbHU8jvY/avc2Yf+RCr1l0AbGJg88wCDczkk2m+ cb3MWu1USeca6D4BhK3Xl6c4F5K2iT8xm4/iWcEuPuRb1e06rfPVHFaZMzDOfSvm69FCgda41lF Fa+34nUmRilXE6XWf0Iov1X2AH5iw0WK1Qj2NDOPtHc8bZqZ58hJRKHEwrltClh/ZQNhY= X-Received: by 2002:a05:6214:1301:b0:88e:6db7:f999 with SMTP id 6a1803df08f44-8942e0c342cmr235499176d6.6.1768933100910; Tue, 20 Jan 2026 10:18:20 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-112-119.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.112.119]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8942e5e535dsm114108506d6.4.2026.01.20.10.18.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jan 2026 10:18:20 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1viGJ1-00000005aZS-41Vi; Tue, 20 Jan 2026 14:18:19 -0400 Date: Tue, 20 Jan 2026 14:18:19 -0400 From: Jason Gunthorpe To: Edward Srouji Cc: Leon Romanovsky , Sumit Semwal , Christian =?utf-8?B?S8O2bmln?= , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, Yishai Hadas Subject: Re: [PATCH rdma-next 2/2] RDMA/mlx5: Implement DMABUF export ops Message-ID: <20260120181819.GT961572@ziepe.ca> References: <20260108-dmabuf-export-v1-0-6d47d46580d3@nvidia.com> <20260108-dmabuf-export-v1-2-6d47d46580d3@nvidia.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260108-dmabuf-export-v1-2-6d47d46580d3@nvidia.com> On Thu, Jan 08, 2026 at 01:11:15PM +0200, Edward Srouji wrote: > +static int phys_addr_to_bar(struct pci_dev *pdev, phys_addr_t pa) > +{ > + resource_size_t start, end; > + int bar; > + > + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) { > + /* Skip BARs not present or not memory-mapped */ > + if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) > + continue; > + > + start = pci_resource_start(pdev, bar); > + end = pci_resource_end(pdev, bar); > + > + if (!start || !end) > + continue; > + > + if (pa >= start && pa <= end) > + return bar; > + } Don't we know which of the two BARs the mmap entry came from based on its type? This seems like overkill.. Jason