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GET /api/patches/815485/?format=api
{ "id": 815485, "url": "http://patchwork.ozlabs.org/api/patches/815485/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20170919115814.14724-5-marcandre.lureau@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170919115814.14724-5-marcandre.lureau@redhat.com>", "list_archive_url": null, "date": "2017-09-19T11:58:14", "name": "[v2,4/4] RFC: fw_cfg: add DMA write operation in sysfs", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "50390be615c744359bedb6c7d696af04ea64b16f", "submitter": { "id": 66774, "url": "http://patchwork.ozlabs.org/api/people/66774/?format=api", "name": "Marc-André Lureau", "email": "marcandre.lureau@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20170919115814.14724-5-marcandre.lureau@redhat.com/mbox/", "series": [ { "id": 3856, "url": "http://patchwork.ozlabs.org/api/series/3856/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=3856", "date": "2017-09-19T11:58:10", "name": "fw_cfg: add DMA operations & etc/vmcoreinfo support", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/3856/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/815485/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/815485/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": [ "ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; helo=lists.gnu.org;\n\tenvelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n\treceiver=<UNKNOWN>)", "ext-mx07.extmail.prod.ext.phx2.redhat.com;\n\tdmarc=none (p=none dis=none) header.from=redhat.com", "ext-mx07.extmail.prod.ext.phx2.redhat.com;\n\tspf=fail smtp.mailfrom=marcandre.lureau@redhat.com" ], "Received": [ "from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11])\n\t(using TLSv1 with cipher AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xxM1z1g5yz9s4q\n\tfor <incoming@patchwork.ozlabs.org>;\n\tTue, 19 Sep 2017 22:02:31 +1000 (AEST)", "from localhost ([::1]:42154 helo=lists.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.71) (envelope-from\n\t<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>)\n\tid 1duHET-0001Tq-DQ\n\tfor incoming@patchwork.ozlabs.org; Tue, 19 Sep 2017 08:02:29 -0400", "from eggs.gnu.org ([2001:4830:134:3::10]:40763)\n\tby lists.gnu.org with esmtp (Exim 4.71)\n\t(envelope-from <marcandre.lureau@redhat.com>) id 1duHAq-0007Vw-5q\n\tfor qemu-devel@nongnu.org; Tue, 19 Sep 2017 07:58:45 -0400", "from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)\n\t(envelope-from <marcandre.lureau@redhat.com>) id 1duHAn-00025r-5X\n\tfor qemu-devel@nongnu.org; Tue, 19 Sep 2017 07:58:44 -0400", "from mx1.redhat.com ([209.132.183.28]:50532)\n\tby eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)\n\t(Exim 4.71) (envelope-from <marcandre.lureau@redhat.com>)\n\tid 1duHAn-00025c-0V\n\tfor qemu-devel@nongnu.org; Tue, 19 Sep 2017 07:58:41 -0400", "from smtp.corp.redhat.com\n\t(int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11])\n\t(using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby mx1.redhat.com (Postfix) with ESMTPS id 031D0C04B936;\n\tTue, 19 Sep 2017 11:58:40 +0000 (UTC)", "from localhost (ovpn-112-56.ams2.redhat.com [10.36.112.56])\n\tby smtp.corp.redhat.com (Postfix) with ESMTP id DE9CE600C2;\n\tTue, 19 Sep 2017 11:58:33 +0000 (UTC)" ], "DMARC-Filter": "OpenDMARC Filter v1.3.2 mx1.redhat.com 031D0C04B936", "From": "marcandre.lureau@redhat.com", "To": "linux-kernel@vger.kernel.org", "Date": "Tue, 19 Sep 2017 13:58:14 +0200", "Message-Id": "<20170919115814.14724-5-marcandre.lureau@redhat.com>", "In-Reply-To": "<20170919115814.14724-1-marcandre.lureau@redhat.com>", "References": "<20170919115814.14724-1-marcandre.lureau@redhat.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "X-Scanned-By": "MIMEDefang 2.79 on 10.5.11.11", "X-Greylist": "Sender IP whitelisted, not delayed by milter-greylist-4.5.16\n\t(mx1.redhat.com [10.5.110.31]);\n\tTue, 19 Sep 2017 11:58:40 +0000 (UTC)", "Content-Transfer-Encoding": "quoted-printable", "X-detected-operating-system": "by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic]\n\t[fuzzy]", "X-Received-From": "209.132.183.28", "Subject": "[Qemu-devel] [PATCH v2 4/4] RFC: fw_cfg: add DMA write operation in\n\tsysfs", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.21", "Precedence": "list", "List-Id": "<qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n\t<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<http://lists.nongnu.org/archive/html/qemu-devel/>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n\t<mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Cc": "=?utf-8?q?Marc-Andr=C3=A9_Lureau?= <marcandre.lureau@redhat.com>,\n\tsomlo@cmu.edu, qemu-devel@nongnu.org, mst@redhat.com", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "\"Qemu-devel\"\n\t<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>" }, "content": "From: Marc-André Lureau <marcandre.lureau@redhat.com>\n\nSince qemu 2.9, DMA write operations are allowed. However, usage of this\ninterface from kernel or user-space is strongly discouraged by the\nmaintainers. This patch is meant for experimentations for now.\n\nSigned-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>\n---\n drivers/firmware/qemu_fw_cfg.c | 21 ++++++++++++++++++++-\n 1 file changed, 20 insertions(+), 1 deletion(-)", "diff": "diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c\nindex 26152bfc7805..1ca3382e98df 100644\n--- a/drivers/firmware/qemu_fw_cfg.c\n+++ b/drivers/firmware/qemu_fw_cfg.c\n@@ -524,9 +524,28 @@ static ssize_t fw_cfg_sysfs_read_raw(struct file *filp, struct kobject *kobj,\n \treturn fw_cfg_read_blob(entry->f.select, buf, pos, count, true);\n }\n \n+static ssize_t fw_cfg_sysfs_write_raw(struct file *filp, struct kobject *kobj,\n+\t\t\t\t struct bin_attribute *bin_attr,\n+\t\t\t\t char *buf, loff_t pos, size_t count)\n+{\n+\tstruct fw_cfg_sysfs_entry *entry = to_entry(kobj);\n+\n+\tif (!fw_cfg_dma_enabled())\n+\t\treturn -ENOTSUPP;\n+\n+\tif (pos > entry->f.size)\n+\t\treturn -EINVAL;\n+\n+\tif (count > entry->f.size - pos)\n+\t\tcount = entry->f.size - pos;\n+\n+\treturn fw_cfg_write_blob(entry->f.select, buf, pos, count);\n+}\n+\n static struct bin_attribute fw_cfg_sysfs_attr_raw = {\n-\t.attr = { .name = \"raw\", .mode = S_IRUSR },\n+\t.attr = { .name = \"raw\", .mode = S_IRUSR | S_IWUSR },\n \t.read = fw_cfg_sysfs_read_raw,\n+\t.write = fw_cfg_sysfs_write_raw,\n };\n \n /*\n", "prefixes": [ "v2", "4/4" ] }