From patchwork Tue Jun 20 13:47:56 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 9799579 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 69E5560329 for ; Tue, 20 Jun 2017 13:49:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DDCD3284F6 for ; Tue, 20 Jun 2017 13:49:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D079F284D4; Tue, 20 Jun 2017 13:49:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 469E6284B0 for ; Tue, 20 Jun 2017 13:49:51 +0000 (UTC) Received: from localhost ([::1]:48945 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dNJXS-0002Mc-8b for patchwork-qemu-devel@patchwork.kernel.org; Tue, 20 Jun 2017 09:49:50 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34299) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dNJWK-0002IL-EK for qemu-devel@nongnu.org; Tue, 20 Jun 2017 09:48:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dNJWH-0000PD-Lm for qemu-devel@nongnu.org; Tue, 20 Jun 2017 09:48:40 -0400 Received: from smtp.citrix.com ([66.165.176.89]:14201) by eggs.gnu.org with esmtps (TLS1.0:RSA_ARCFOUR_SHA1:16) (Exim 4.71) (envelope-from ) id 1dNJWH-0000Oz-Ep; Tue, 20 Jun 2017 09:48:37 -0400 X-IronPort-AV: E=Sophos;i="5.39,364,1493683200"; d="scan'208";a="428636658" From: Paul Durrant To: , , Date: Tue, 20 Jun 2017 09:47:56 -0400 Message-ID: <20170620134756.9632-4-paul.durrant@citrix.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170620134756.9632-1-paul.durrant@citrix.com> References: <20170620134756.9632-1-paul.durrant@citrix.com> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 66.165.176.89 Subject: [Qemu-devel] [PATCH 3/3] xen-disk: use an IOThread per instance 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: Anthony Perard , Kevin Wolf , Paul Durrant , Stefano Stabellini , Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This patch allocates an IOThread object for each xen_disk instance and sets the AIO context appropriately on connect. This allows processing of I/O to proceed in parallel. The patch also adds tracepoints into xen_disk to make it possible to follow the state transtions of an instance in the log. Signed-off-by: Paul Durrant --- Cc: Stefano Stabellini Cc: Anthony Perard Cc: Kevin Wolf Cc: Max Reitz --- hw/block/trace-events | 7 +++++++ hw/block/xen_disk.c | 44 +++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 50 insertions(+), 1 deletion(-) diff --git a/hw/block/trace-events b/hw/block/trace-events index 65e83dc258..608b24ba66 100644 --- a/hw/block/trace-events +++ b/hw/block/trace-events @@ -10,3 +10,10 @@ virtio_blk_submit_multireq(void *mrb, int start, int num_reqs, uint64_t offset, # hw/block/hd-geometry.c hd_geometry_lchs_guess(void *blk, int cyls, int heads, int secs) "blk %p LCHS %d %d %d" hd_geometry_guess(void *blk, uint32_t cyls, uint32_t heads, uint32_t secs, int trans) "blk %p CHS %u %u %u trans %d" + +# hw/block/xen_disk.c +xen_disk_alloc(char *name) "%s" +xen_disk_init(char *name) "%s" +xen_disk_connect(char *name) "%s" +xen_disk_disconnect(char *name) "%s" +xen_disk_free(char *name) "%s" diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c index a9942d32db..ec1085c802 100644 --- a/hw/block/xen_disk.c +++ b/hw/block/xen_disk.c @@ -27,10 +27,13 @@ #include "hw/xen/xen_backend.h" #include "xen_blkif.h" #include "sysemu/blockdev.h" +#include "sysemu/iothread.h" #include "sysemu/block-backend.h" #include "qapi/error.h" #include "qapi/qmp/qdict.h" #include "qapi/qmp/qstring.h" +#include "qom/object_interfaces.h" +#include "trace.h" /* ------------------------------------------------------------- */ @@ -128,6 +131,9 @@ struct XenBlkDev { DriveInfo *dinfo; BlockBackend *blk; QEMUBH *bh; + + IOThread *iothread; + AioContext *ctx; }; /* ------------------------------------------------------------- */ @@ -923,11 +929,31 @@ static void blk_bh(void *opaque) static void blk_alloc(struct XenDevice *xendev) { struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); + Object *obj; + char *name; + Error *err = NULL; + + trace_xen_disk_alloc(xendev->name); QLIST_INIT(&blkdev->inflight); QLIST_INIT(&blkdev->finished); QLIST_INIT(&blkdev->freelist); - blkdev->bh = qemu_bh_new(blk_bh, blkdev); + + obj = object_new(TYPE_IOTHREAD); + name = g_strdup_printf("iothread-%s", xendev->name); + + object_property_add_child(object_get_objects_root(), name, obj, &err); + assert(!err); + + g_free(name); + + user_creatable_complete(obj, &err); + assert(!err); + + blkdev->iothread = (IOThread *)object_dynamic_cast(obj, TYPE_IOTHREAD); + blkdev->ctx = iothread_get_aio_context(blkdev->iothread); + blkdev->bh = aio_bh_new(blkdev->ctx, blk_bh, blkdev); + if (xen_mode != XEN_EMULATE) { batch_maps = 1; } @@ -954,6 +980,8 @@ static int blk_init(struct XenDevice *xendev) int info = 0; char *directiosafe = NULL; + trace_xen_disk_init(xendev->name); + /* read xenstore entries */ if (blkdev->params == NULL) { char *h = NULL; @@ -1069,6 +1097,8 @@ static int blk_connect(struct XenDevice *xendev) unsigned int i; uint32_t *domids; + trace_xen_disk_connect(xendev->name); + /* read-only ? */ if (blkdev->directiosafe) { qflags = BDRV_O_NOCACHE | BDRV_O_NATIVE_AIO; @@ -1285,6 +1315,8 @@ static int blk_connect(struct XenDevice *xendev) blkdev->persistent_gnt_count = 0; } + blk_set_aio_context(blkdev->blk, blkdev->ctx); + xen_be_bind_evtchn(&blkdev->xendev); xen_pv_printf(&blkdev->xendev, 1, "ok: proto %s, nr-ring-ref %u, " @@ -1298,13 +1330,20 @@ static void blk_disconnect(struct XenDevice *xendev) { struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); + trace_xen_disk_disconnect(xendev->name); + + aio_context_acquire(blkdev->ctx); + if (blkdev->blk) { + blk_set_aio_context(blkdev->blk, qemu_get_aio_context()); blk_detach_dev(blkdev->blk, blkdev); blk_unref(blkdev->blk); blkdev->blk = NULL; } xen_pv_unbind_evtchn(&blkdev->xendev); + aio_context_release(blkdev->ctx); + if (blkdev->sring) { xengnttab_unmap(blkdev->xendev.gnttabdev, blkdev->sring, blkdev->nr_ring_ref); @@ -1338,6 +1377,8 @@ static int blk_free(struct XenDevice *xendev) struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); struct ioreq *ioreq; + trace_xen_disk_free(xendev->name); + if (blkdev->blk || blkdev->sring) { blk_disconnect(xendev); } @@ -1355,6 +1396,7 @@ static int blk_free(struct XenDevice *xendev) g_free(blkdev->dev); g_free(blkdev->devtype); qemu_bh_delete(blkdev->bh); + object_unparent(OBJECT(blkdev->iothread)); return 0; }