From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f43.google.com (mail-ot1-f43.google.com [209.85.210.43]) (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 C96024E56EB for ; Mon, 12 Oct 2026 20:21:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.43 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791836509; cv=none; b=eHDZkwxC5dx95sRDbJCfTu3004jjuM05m4Vl5ZMDoNDCv+MSy3eAR7QKHsAhc42TCOQflrRyMcDGH2SsGN89ojW76cVjuiZXB92eHJj3NPv+/4kTXm4LmL7lolSn0xgFV4v5mI8hXu4l9OnFiA7P6sF7XwnSYbckVTGLwjplvjY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791836509; c=relaxed/simple; bh=lli5ii/H/rCG9APVq9ZvpYJJiJuxiuQfHiO8zLh8fqI=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=oRGo8sYY9PyZ/SZKuql2RVxK6uvEQy7zGV2YOz1HJGX5H+/z8hEZo3M59wu1b6Hu0ggUhVBM0fsV9E65Mf9HqXSEaERGF2fd/sjibKY+2lBJKwefuRZ635bO1AwYtBDswZLBk8EdLcIkEXiQJEZxL5YuTcCFFe6QGHsNa3kzZ0I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk; spf=pass smtp.mailfrom=kernel.dk; dkim=pass (2048-bit key) header.d=kernel-dk.20251104.gappssmtp.com header.i=@kernel-dk.20251104.gappssmtp.com header.b=FyjxMzY4; arc=none smtp.client-ip=209.85.210.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kernel.dk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20251104.gappssmtp.com header.i=@kernel-dk.20251104.gappssmtp.com header.b="FyjxMzY4" Received: by mail-ot1-f43.google.com with SMTP id 46e09a7af769-8266c388b67so1981203a34.0 for ; Mon, 12 Oct 2026 13:21:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20251104.gappssmtp.com; s=20251104; t=1791836507; x=1792441307; darn=lists.linux.dev; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to :content-type; bh=Z6hOwSLR8cfh8cDplIOaHfJc8wiTVy6P5jX2Jl3fTgI=; b=FyjxMzY4Jqk+hu3M7xA+qMqJoyzM1buNQTb1jxY7QKN5FBK1kRdXB33GOHCTgFPz9h +YJeP0JBhJSu1fVjOjiTDoh+RHk7Tou/AK2D8Udy5KDG47DkC54FDHuGSgQxM0g+T3Aa ZE+UL+F6gt/53rz2i7W+AwRTp+RoHSfPku9mAOxIT2OfdzUqSUSlzJrTNFIY8an6jyBr n9qZ8Ni6GTWt59Koqxmet4XczNZrDnSebumdEyvFbmGeaN4a5ZT/WtC5iiVtl6ZAoxP/ bsVnggnI+thvyyln9p2r5UJYXTJlBM8tewLfgKwjXXbHw6CBfApN+85zvh+7bOPABEOS McXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791836507; x=1792441307; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=Z6hOwSLR8cfh8cDplIOaHfJc8wiTVy6P5jX2Jl3fTgI=; b=eKqkbhOD46XMIA34nl69DNvum1HvVb54SXRKAQADLKLYRFfEXcVtLeG1gT5GTo+K28 3MH5a073OAC9CeAdoPHTJSl8eFKz9K8KOYsRkt+11iCyoQQvqVTScsiy3gFoOsN9Cgo1 QOBkGb7lwAVNVd5hfn1FFECtxOgFOixjpDfVHha5WepmVDmBly3g1Od88xrVT6bn32NX iLsy7pvtrIj0zcE8AWKApF6JvGrNoOXMx1atftkT/9CLQ/OA04AAkVeQB6xV28TDRRFc BpJO4b7yZPnlD6Vl73vIPLR8V6AcPLWweluPxTXfMKJob6C/UDNxnEUtYoHaSak3kpDk a1xA== X-Forwarded-Encrypted: i=1; AKwUvBz6xwdygnVYtxeIRJdTkE13Be2ER1cQkSyGaX4bRsq5hqE5Hn6L63Avjec4OfHmg1+X0pB4Bo+mTg==@lists.linux.dev X-Gm-Message-State: AFq9FYLKTaCi23bxOncehEWJ/Nx2fU4eWw0ERyLbXSfKJfpb6CBs4XH9 AtzZ94Dbk+DqapU6mSED07YgYhCdEJ8wCyGlO0G5J7DGfOeUYFo16mtMRXa0kPXXfBw= X-Gm-Gg: AYBFou1oV5KjE5XLMO8GWyRFLaBH+2bxv/mHwEIpO5JWUEB34cz0hL4cD70BK0E4Zr6 PXCnrwy0BF3skx0fg4ysd5GLtKVPMvQkAXVcPc/vmqwb0z9pjO0J8ZE7rA5x+Yp+bQWiOBHlEKg I4AVYQAVDuD757400ji8fhi4fe2LRJBhtXCGtNfD8dJnCRwuHIGf2geW6thcqwuaKcr8346S4xb xcSbhm7Uyg7ygEqdY5YDvjO8z8CqLWmjJsgms0fM4uA5UzXOKcmG2mDOqj6vwqfjymXPRk5fSBR eC3g7vU7ko//VimX40xH8JnKnVwmI9F9Gdne1NE4/iiCCKVDUbWodWpvzDJPOFMziipWr/uqvZ4 +5fpVAjzmi/IQUWWZZpQTSuZDN08z9ofh/dfcuYimohMSvasA5mOiBSQnAjMIq4K3VEUH+U+wAA MIJVtjwDX8XaJugdt/81nEQxbrZBNHIMtsC5XiRpwMslb98QrDfHeFopXnbAnKtMnqy2Tn31r21 exoeI3RgPBdQMmsb8daxYmCjgbZQazIwwtMWu1Iw2oL7GE1jehDFnJ+kA== X-Received: by 2002:a05:6808:f88:b0:4d7:17d5:6c9b with SMTP id 5614622812f47-50c40a3e034mr9500602b6e.9.1791836506735; Mon, 12 Oct 2026 13:21:46 -0700 (PDT) Received: from [192.168.1.106] ([198.8.77.135]) by smtp.gmail.com with ESMTPSA id 5614622812f47-50c167544b5sm12396143b6e.3.2026.10.12.13.21.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 Oct 2026 13:21:45 -0700 (PDT) Message-ID: Date: Mon, 12 Oct 2026 14:21:41 -0600 Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 00/13] Add dmabuf read/write via io_uring To: Pavel Begunkov , linux-block@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, Christoph Hellwig , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Keith Busch , Sagi Grimberg , Alexander Viro , Christian Brauner , Jan Kara , Andrew Morton , Nitesh Shetty , Kanchan Joshi , Anuj Gupta , Tushar Gohad , William Power , Matthew Brost , Alasdair Kergon , Mike Snitzer , Mikulas Patocka , Benjamin Marzinski , dm-devel@lists.linux.dev References: Content-Language: en-US From: Jens Axboe In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/6/26 7:42 PM, Pavel Begunkov wrote: > The patch set allows to register a dmabuf to an io_uring instance for > a specified file and use it with io_uring read / write requests. The > infrastructure is not tied to io_uring and there could be more users > in the future. A similar idea was attempted some years ago by Keith [1], > from where I borrowed a number of changes. Later it was brough back up > to life by Tushar and Vishal. > > It's an opt-in feature for files, and they need to implement a new > file operation to use it. Only NVMe block devices are supported in this > series. The user API is built on top of io_uring's "registered buffers", > where a dmabuf is registered in a special way, but after it can be used > as any other "registered buffer" with IORING_OP_{READ,WRITE}_FIXED > requests. It's created via a new file operation and the resulted map is > then passed through the I/O stack in a new iterator type. There is some > additional infrastructure to glue it together, count requests, manage > lifetime and implement invalidation. I've queued this series up for some testing, in a separate branch. JFYI. -- Jens Axboe