{"id":815485,"url":"http://patchwork.ozlabs.org/api/patches/815485/?format=json","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=json","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=json","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=json","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":"","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=)","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 ;\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)\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 ) 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 ) 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 )\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":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"=?utf-8?q?Marc-Andr=C3=A9_Lureau?= ,\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"},"content":"From: Marc-André Lureau \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 \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"]}