From patchwork Mon Sep 30 14:40:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 831715 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B992B23D2; Mon, 30 Sep 2024 14:41:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727707262; cv=none; b=n7Jp181dYvZOJFpReT79g8LYYvfVIEc0qbnJcWV7YStmllzQRmZbi7sfi90ZzWQCL6IqlK6VyNKIHylRvj3ga4IECSgPjwGtAKwd1XJucIKTcIRnhgQs0UjfOe1Tq/bCli4AJm76r7LHJj7DhGsCigHfDZxWbQGkberdHAh+TXE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727707262; c=relaxed/simple; bh=eCGxBwukXU9AhcTC9DwmQWbt9WtBgWUdKXNjfrH+vL8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=j2QHYGwBod6snSqyU5+ZxU9D/v2esWsfuJo3xdMGXIr/wHKlTfQjbq837chylAlD7G+5mHhTl/x9RO5EzKOWb0wifyVK8TxBhUojcbkKi1meEA2KZa5fAYW8JtewYI7gEK8Oi//G/vWr9h9YfuNpTd+0whW6sEiJ69bJ2FtEMAA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=G3DRNoqA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="G3DRNoqA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E83B7C4CEC7; Mon, 30 Sep 2024 14:41:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727707262; bh=eCGxBwukXU9AhcTC9DwmQWbt9WtBgWUdKXNjfrH+vL8=; h=From:To:Cc:Subject:Date:From; b=G3DRNoqAU10hkSUeqgx9WMNsE16IiJWNWLDULU1gCPrzvi9Xunquflt3XbreOTZWZ jDdke6JKVmd8+nHP8flpkFvyeX4m343alNN1SwjVzyr9lHEJtDjq2r19T5zFGJSWF0 PwgLVE5ayBEG4XvG1Ky0b1mlNAE48jIe8FJv9wqhNVFJsOj4YjK/CaYoNzHGtx5ZYy 5fO0HC0+Fw7c0P56wnxR5j5jXEWQduWOhAxghWZ+VY6asvFKr6P9y/xgUlvcjVBYrs 2o5Ks80hvqzwJBQw8IPsMox1vAhpRMGaElO+UJwMHw6BvOVB0Vchwl8eZ+58EaVZqX jvLuMNVDqn8kQ== From: Maxime Ripard To: Jonathan Corbet , Sumit Semwal Cc: Maxime Ripard , Benjamin Gaignard , Brian Starkey , John Stultz , "T.J. Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH] Documentation: dma-buf: heaps: Add heap name definitions Date: Mon, 30 Sep 2024 16:40:57 +0200 Message-ID: <20240930144057.453751-1-mripard@kernel.org> X-Mailer: git-send-email 2.46.1 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Following a recent discussion at last Plumbers, John Stultz, Sumit Sewal, TJ Mercier and I came to an agreement that we should document what the dma-buf heaps names are expected to be, and what the buffers attributes you'll get should be documented. Let's create that doc to make sure those attributes and names are guaranteed going forward. Signed-off-by: Maxime Ripard --- To: Jonathan Corbet To: Sumit Semwal Cc: Benjamin Gaignard Cc: Brian Starkey Cc: John Stultz Cc: "T.J. Mercier" Cc: "Christian König" Cc: dri-devel@lists.freedesktop.org Cc: linaro-mm-sig@lists.linaro.org Cc: linux-media@vger.kernel.org Cc: linux-doc@vger.kernel.org --- Documentation/userspace-api/dma-buf-heaps.rst | 71 +++++++++++++++++++ Documentation/userspace-api/index.rst | 1 + 2 files changed, 72 insertions(+) create mode 100644 Documentation/userspace-api/dma-buf-heaps.rst diff --git a/Documentation/userspace-api/dma-buf-heaps.rst b/Documentation/userspace-api/dma-buf-heaps.rst new file mode 100644 index 000000000000..00436227b542 --- /dev/null +++ b/Documentation/userspace-api/dma-buf-heaps.rst @@ -0,0 +1,71 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================== +Allocating dma-buf using heaps +============================== + +Dma-buf Heaps are a way for userspace to allocate dma-buf objects. They are +typically used to allocate buffers from a specific allocation pool, or to share +buffers across frameworks. + +Heaps +===== + +A heap represent a specific allocator. The Linux kernel currently supports the +following heaps: + + - The ``system`` heap allocates virtually contiguous, cacheable, buffers + + - The ``reserved`` heap allocates physically contiguous, cacheable, buffers. + Depending on the platform, it might be called differently: + + - Acer Iconia Tab A500: ``linux,cma`` + - Allwinner sun4i, sun5i and sun7i families: ``default-pool`` + - Amlogic A1: ``linux,cma`` + - Amlogic G12A/G12B/SM1: ``linux,cma`` + - Amlogic GXBB/GXL: ``linux,cma`` + - ASUS EeePad Transformer TF101: ``linux,cma`` + - ASUS Google Nexus 7 (Project Bach / ME370TG) E1565: ``linux,cma`` + - ASUS Google Nexus 7 (Project Nakasi / ME370T) E1565: ``linux,cma`` + - ASUS Google Nexus 7 (Project Nakasi / ME370T) PM269: ``linux,cma`` + - Asus Transformer Infinity TF700T: ``linux,cma`` + - Asus Transformer Pad 3G TF300TG: ``linux,cma`` + - Asus Transformer Pad TF300T: ``linux,cma`` + - Asus Transformer Pad TF701T: ``linux,cma`` + - Asus Transformer Prime TF201: ``linux,cma`` + - ASUS Vivobook S 15: ``linux,cma`` + - Cadence KC705: ``linux,cma`` + - Digi International ConnectCore 6UL: ``linux,cma`` + - Freescale i.MX8DXL EVK: ``linux,cma`` + - Freescale TQMa8Xx: ``linux,cma`` + - Hisilicon Hikey: ``linux,cma`` + - Lenovo ThinkPad T14s Gen 6: ``linux,cma`` + - Lenovo ThinkPad X13s: ``linux,cma`` + - Lenovo Yoga Slim 7x: ``linux,cma`` + - LG Optimus 4X HD P880: ``linux,cma`` + - LG Optimus Vu P895: ``linux,cma`` + - Loongson 2k0500, 2k1000 and 2k2000: ``linux,cma`` + - Microsoft Romulus: ``linux,cma`` + - NXP i.MX8ULP EVK: ``linux,cma`` + - NXP i.MX93 9x9 QSB: ``linux,cma`` + - NXP i.MX93 11X11 EVK: ``linux,cma`` + - NXP i.MX93 14X14 EVK: ``linux,cma`` + - NXP i.MX95 19X19 EVK: ``linux,cma`` + - Ouya Game Console: ``linux,cma`` + - Pegatron Chagall: ``linux,cma`` + - PHYTEC phyCORE-AM62A SOM: ``linux,cma`` + - PHYTEC phyCORE-i.MX93 SOM: ``linux,cma`` + - Qualcomm SC8280XP CRD: ``linux,cma`` + - Qualcomm X1E80100 CRD: ``linux,cma`` + - Qualcomm X1E80100 QCP: ``linux,cma`` + - RaspberryPi: ``linux,cma`` + - Texas Instruments AM62x SK board family: ``linux,cma`` + - Texas Instruments AM62A7 SK: ``linux,cma`` + - Toradex Apalis iMX8: ``linux,cma`` + - TQ-Systems i.MX8MM TQMa8MxML: ``linux,cma`` + - TQ-Systems i.MX8MN TQMa8MxNL: ``linux,cma`` + - TQ-Systems i.MX8MPlus TQMa8MPxL: ``linux,cma`` + - TQ-Systems i.MX8MQ TQMa8MQ: ``linux,cma`` + - TQ-Systems i.MX93 TQMa93xxLA/TQMa93xxCA SOM: ``linux,cma`` + - TQ-Systems MBA6ULx Baseboard: ``linux,cma`` + diff --git a/Documentation/userspace-api/index.rst b/Documentation/userspace-api/index.rst index 274cc7546efc..4901ce7c6cb7 100644 --- a/Documentation/userspace-api/index.rst +++ b/Documentation/userspace-api/index.rst @@ -41,10 +41,11 @@ Devices and I/O .. toctree:: :maxdepth: 1 accelerators/ocxl + dma-buf-heaps dma-buf-alloc-exchange gpio/index iommufd media/index dcdbas