From nobody Tue Feb 10 13:01:28 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.zohomail.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 1499262028940636.2060159114023; Wed, 5 Jul 2017 06:40:28 -0700 (PDT) Received: from localhost ([::1]:46269 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSkXV-0007dA-Ob for importer@patchew.org; Wed, 05 Jul 2017 09:40:21 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39005) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSkUT-0005Br-Ns for qemu-devel@nongnu.org; Wed, 05 Jul 2017 09:37:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dSkUS-0004MU-Nc for qemu-devel@nongnu.org; Wed, 05 Jul 2017 09:37:13 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43260) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dSkUO-0004KP-Vv; Wed, 05 Jul 2017 09:37:09 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D1BAA13A8A; Wed, 5 Jul 2017 13:37:07 +0000 (UTC) Received: from lemon.redhat.com (ovpn-12-22.pek2.redhat.com [10.72.12.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id C454E5C88A; Wed, 5 Jul 2017 13:36:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D1BAA13A8A Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=famz@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com D1BAA13A8A From: Fam Zheng To: qemu-devel@nongnu.org Date: Wed, 5 Jul 2017 21:36:32 +0800 Message-Id: <20170705133635.11850-4-famz@redhat.com> In-Reply-To: <20170705133635.11850-1-famz@redhat.com> References: <20170705133635.11850-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 05 Jul 2017 13:37:08 +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 v3 3/6] 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: Kevin Wolf , Fam Zheng , qemu-block@nongnu.org, Max Reitz , Keith Busch , Stefan Hajnoczi , Paolo Bonzini , 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 0df3457..784b936 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -1974,3 +1974,13 @@ static void blk_root_drained_end(BdrvChild *child) } } } + +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 2de7c77..988e4db 100644 --- a/block/io.c +++ b/block/io.c @@ -2537,3 +2537,27 @@ 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 4c149ad..f59b50a 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -624,4 +624,6 @@ 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 15fa602..4092669 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -381,6 +381,10 @@ struct BlockDriver { uint64_t parent_perm, uint64_t parent_shared, uint64_t *nperm, uint64_t *nshared); =20 + /* Map and unmap a buffer for 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 1e05281..5f7ccdb 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -239,4 +239,7 @@ 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 2.9.4