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{
    "id": 816405,
    "url": "http://patchwork.ozlabs.org/api/patches/816405/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20170920185956.13874-2-wsa+renesas@sang-engineering.com/",
    "project": {
        "id": 35,
        "url": "http://patchwork.ozlabs.org/api/projects/35/?format=api",
        "name": "Linux I2C development",
        "link_name": "linux-i2c",
        "list_id": "linux-i2c.vger.kernel.org",
        "list_email": "linux-i2c@vger.kernel.org",
        "web_url": "",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<20170920185956.13874-2-wsa+renesas@sang-engineering.com>",
    "list_archive_url": null,
    "date": "2017-09-20T18:59:51",
    "name": "[RFC,v5,1/6] i2c: add a message flag for DMA safe buffers",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": false,
    "hash": "bddd5f186e82d27ce84b1deec4206e85175f0892",
    "submitter": {
        "id": 69646,
        "url": "http://patchwork.ozlabs.org/api/people/69646/?format=api",
        "name": "Wolfram Sang",
        "email": "wsa+renesas@sang-engineering.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20170920185956.13874-2-wsa+renesas@sang-engineering.com/mbox/",
    "series": [
        {
            "id": 4199,
            "url": "http://patchwork.ozlabs.org/api/series/4199/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=4199",
            "date": "2017-09-20T18:59:56",
            "name": "i2c: document DMA handling and add helpers for it",
            "version": 5,
            "mbox": "http://patchwork.ozlabs.org/series/4199/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/816405/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/816405/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<linux-i2c-owner@vger.kernel.org>",
        "X-Original-To": "incoming@patchwork.ozlabs.org",
        "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org",
        "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=linux-i2c-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)",
        "Received": [
            "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xy8GT6KJSz9s4s\n\tfor <incoming@patchwork.ozlabs.org>;\n\tThu, 21 Sep 2017 05:01:05 +1000 (AEST)",
            "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751626AbdITTAF (ORCPT <rfc822;incoming@patchwork.ozlabs.org>);\n\tWed, 20 Sep 2017 15:00:05 -0400",
            "from sauhun.de ([88.99.104.3]:38834 \"EHLO pokefinder.org\"\n\trhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP\n\tid S1751396AbdITTAD (ORCPT <rfc822;linux-i2c@vger.kernel.org>);\n\tWed, 20 Sep 2017 15:00:03 -0400",
            "from localhost (p54B332E6.dip0.t-ipconnect.de [84.179.50.230])\n\tby pokefinder.org (Postfix) with ESMTPSA id DD2652C4397;\n\tWed, 20 Sep 2017 21:00:01 +0200 (CEST)"
        ],
        "From": "Wolfram Sang <wsa+renesas@sang-engineering.com>",
        "To": "linux-i2c@vger.kernel.org",
        "Cc": "linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,\n\tlinux-iio@vger.kernel.org, linux-input@vger.kernel.org,\n\tlinux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,\n\tWolfram Sang <wsa+renesas@sang-engineering.com>",
        "Subject": "[RFC PATCH v5 1/6] i2c: add a message flag for DMA safe buffers",
        "Date": "Wed, 20 Sep 2017 20:59:51 +0200",
        "Message-Id": "<20170920185956.13874-2-wsa+renesas@sang-engineering.com>",
        "X-Mailer": "git-send-email 2.11.0",
        "In-Reply-To": "<20170920185956.13874-1-wsa+renesas@sang-engineering.com>",
        "References": "<20170920185956.13874-1-wsa+renesas@sang-engineering.com>",
        "Sender": "linux-i2c-owner@vger.kernel.org",
        "Precedence": "bulk",
        "List-ID": "<linux-i2c.vger.kernel.org>",
        "X-Mailing-List": "linux-i2c@vger.kernel.org"
    },
    "content": "I2C has no requirement that the buffer of a message needs to be DMA\nsafe. In case it is, it can now be flagged, so drivers wishing to\ndo DMA can use the buffer directly.\n\nSigned-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>\n---\n include/uapi/linux/i2c.h | 3 +++\n 1 file changed, 3 insertions(+)",
    "diff": "diff --git a/include/uapi/linux/i2c.h b/include/uapi/linux/i2c.h\nindex 009e27bb9abe19..1c683cb319e4b7 100644\n--- a/include/uapi/linux/i2c.h\n+++ b/include/uapi/linux/i2c.h\n@@ -71,6 +71,9 @@ struct i2c_msg {\n #define I2C_M_RD\t\t0x0001\t/* read data, from slave to master */\n \t\t\t\t\t/* I2C_M_RD is guaranteed to be 0x0001! */\n #define I2C_M_TEN\t\t0x0010\t/* this is a ten bit chip address */\n+#define I2C_M_DMA_SAFE\t\t0x0200\t/* the buffer of this message is DMA safe */\n+\t\t\t\t\t/* makes only sense in kernelspace */\n+\t\t\t\t\t/* userspace buffers are copied anyway */\n #define I2C_M_RECV_LEN\t\t0x0400\t/* length will be first received byte */\n #define I2C_M_NO_RD_ACK\t\t0x0800\t/* if I2C_FUNC_PROTOCOL_MANGLING */\n #define I2C_M_IGNORE_NAK\t0x1000\t/* if I2C_FUNC_PROTOCOL_MANGLING */\n",
    "prefixes": [
        "RFC",
        "v5",
        "1/6"
    ]
}