From nobody Mon Feb 9 19:30:21 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1487841883680820.047280671539; Thu, 23 Feb 2017 01:24:43 -0800 (PST) Received: from localhost ([::1]:57396 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cgpdi-0002MZ-9e for importer@patchew.org; Thu, 23 Feb 2017 04:24:42 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51459) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cgpYI-0005df-No for qemu-devel@nongnu.org; Thu, 23 Feb 2017 04:19:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cgpYH-0003CY-T8 for qemu-devel@nongnu.org; Thu, 23 Feb 2017 04:19:06 -0500 Received: from mx1.redhat.com ([209.132.183.28]:48176) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cgpYF-0003C4-HH; Thu, 23 Feb 2017 04:19:03 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B497F4E02A; Thu, 23 Feb 2017 09:19:03 +0000 (UTC) Received: from lemon.redhat.com (ovpn-8-19.pek2.redhat.com [10.72.8.19]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v1N9Il4o003277; Thu, 23 Feb 2017 04:19:00 -0500 From: Fam Zheng To: qemu-devel@nongnu.org Date: Thu, 23 Feb 2017 17:18:43 +0800 Message-Id: <20170223091845.18523-5-famz@redhat.com> In-Reply-To: <20170223091845.18523-1-famz@redhat.com> References: <20170223091845.18523-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 23 Feb 2017 09:19:03 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 4/6] block: Introduce bdrv_dma_map and bdrv_dma_unmap X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Max Reitz , qemu-block@nongnu.org, Stefan Hajnoczi , Karl Rister Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Allow block driver to map and unmap a buffer for later I/O, as a performance hint. Signed-off-by: Fam Zheng --- block/block-backend.c | 10 ++++++++++ block/io.c | 24 ++++++++++++++++++++++++ include/block/block.h | 2 ++ include/block/block_int.h | 4 ++++ include/sysemu/block-backend.h | 3 +++ 5 files changed, 43 insertions(+) diff --git a/block/block-backend.c b/block/block-backend.c index 819f272..ff05662 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -1786,3 +1786,13 @@ static void blk_root_drained_end(BdrvChild *child) assert(blk->public.io_limits_disabled); --blk->public.io_limits_disabled; } + +void blk_dma_map(BlockBackend *blk, void *host, size_t size) +{ + bdrv_dma_map(blk_bs(blk), host, size); +} + +void blk_dma_unmap(BlockBackend *blk, void *host) +{ + bdrv_dma_unmap(blk_bs(blk), host); +} diff --git a/block/io.c b/block/io.c index d5c4544..541a5fb 100644 --- a/block/io.c +++ b/block/io.c @@ -2646,3 +2646,27 @@ void bdrv_io_unplug(BlockDriverState *bs) bdrv_io_unplug(child->bs); } } + +void bdrv_dma_map(BlockDriverState *bs, void *host, size_t size) +{ + BdrvChild *child; + + if (bs->drv && bs->drv->bdrv_dma_map) { + bs->drv->bdrv_dma_map(bs, host, size); + } + QLIST_FOREACH(child, &bs->children, next) { + bdrv_dma_map(child->bs, host, size); + } +} + +void bdrv_dma_unmap(BlockDriverState *bs, void *host) +{ + BdrvChild *child; + + if (bs->drv && bs->drv->bdrv_dma_unmap) { + bs->drv->bdrv_dma_unmap(bs, host); + } + QLIST_FOREACH(child, &bs->children, next) { + bdrv_dma_unmap(child->bs, host); + } +} diff --git a/include/block/block.h b/include/block/block.h index 4e81f20..1c72159 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -551,4 +551,6 @@ void bdrv_add_child(BlockDriverState *parent, BlockDriv= erState *child, Error **errp); void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **er= rp); =20 +void bdrv_dma_map(BlockDriverState *bs, void *host, size_t size); +void bdrv_dma_unmap(BlockDriverState *bs, void *host); #endif diff --git a/include/block/block_int.h b/include/block/block_int.h index 1670941..b061fd1 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -320,6 +320,10 @@ struct BlockDriver { void (*bdrv_del_child)(BlockDriverState *parent, BdrvChild *child, Error **errp); =20 + /* Map and unmap a buffer for later I/O, as a performance hint to the + * driver. */ + void (*bdrv_dma_map)(BlockDriverState *bs, void *host, size_t size); + void (*bdrv_dma_unmap)(BlockDriverState *bs, void *host); QLIST_ENTRY(BlockDriver) list; }; =20 diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index f365a51..6832b48 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -230,4 +230,7 @@ void blk_io_limits_disable(BlockBackend *blk); void blk_io_limits_enable(BlockBackend *blk, const char *group); void blk_io_limits_update_group(BlockBackend *blk, const char *group); =20 +void blk_dma_map(BlockBackend *blk, void *host, size_t size); +void blk_dma_unmap(BlockBackend *blk, void *host); + #endif --=20 2.9.3