From patchwork Wed Sep 11 16:42:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Dr. David Alan Gilbert" X-Patchwork-Id: 1161131 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 46T74G6j4vz9sDB for ; Thu, 12 Sep 2019 02:42:54 +1000 (AEST) Received: from localhost ([::1]:53646 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i85hk-0001UH-8v for incoming@patchwork.ozlabs.org; Wed, 11 Sep 2019 12:42:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41869) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i85h8-0001Py-Gh for qemu-devel@nongnu.org; Wed, 11 Sep 2019 12:42:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i85h6-00008E-W3 for qemu-devel@nongnu.org; Wed, 11 Sep 2019 12:42:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34482) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i85h6-00007r-OL for qemu-devel@nongnu.org; Wed, 11 Sep 2019 12:42:12 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1B16F1918642 for ; Wed, 11 Sep 2019 16:42:12 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-117-243.ams2.redhat.com [10.36.117.243]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1A2AF60BEC; Wed, 11 Sep 2019 16:42:10 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, pbonzini@redhat.com, berrange@redhat.com, quintela@redhat.com Date: Wed, 11 Sep 2019 17:42:02 +0100 Message-Id: <20190911164202.31136-4-dgilbert@redhat.com> In-Reply-To: <20190911164202.31136-1-dgilbert@redhat.com> References: <20190911164202.31136-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.70]); Wed, 11 Sep 2019 16:42:12 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 3/3] migration: Use automatic rcu_read unlock in rdma.c X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: "Dr. David Alan Gilbert" Use the automatic read unlocker in migration/rdma.c. Signed-off-by: Dr. David Alan Gilbert --- migration/rdma.c | 57 ++++++++++-------------------------------------- 1 file changed, 11 insertions(+), 46 deletions(-) diff --git a/migration/rdma.c b/migration/rdma.c index 78e6b72bac..40f8292ab9 100644 --- a/migration/rdma.c +++ b/migration/rdma.c @@ -88,7 +88,6 @@ static uint32_t known_capabilities = RDMA_CAPABILITY_PIN_ALL; " to abort!"); \ rdma->error_reported = 1; \ } \ - rcu_read_unlock(); \ return rdma->error_state; \ } \ } while (0) @@ -2678,11 +2677,10 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc, size_t i; size_t len = 0; - rcu_read_lock(); + RCU_READ_LOCK_AUTO rdma = atomic_rcu_read(&rioc->rdmaout); if (!rdma) { - rcu_read_unlock(); return -EIO; } @@ -2695,7 +2693,6 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc, ret = qemu_rdma_write_flush(f, rdma); if (ret < 0) { rdma->error_state = ret; - rcu_read_unlock(); return ret; } @@ -2715,7 +2712,6 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc, if (ret < 0) { rdma->error_state = ret; - rcu_read_unlock(); return ret; } @@ -2724,7 +2720,6 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc, } } - rcu_read_unlock(); return done; } @@ -2764,11 +2759,10 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc, ssize_t i; size_t done = 0; - rcu_read_lock(); + RCU_READ_LOCK_AUTO rdma = atomic_rcu_read(&rioc->rdmain); if (!rdma) { - rcu_read_unlock(); return -EIO; } @@ -2805,7 +2799,6 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc, if (ret < 0) { rdma->error_state = ret; - rcu_read_unlock(); return ret; } @@ -2819,14 +2812,12 @@ static ssize_t qio_channel_rdma_readv(QIOChannel *ioc, /* Still didn't get enough, so lets just return */ if (want) { if (done == 0) { - rcu_read_unlock(); return QIO_CHANNEL_ERR_BLOCK; } else { break; } } } - rcu_read_unlock(); return done; } @@ -2882,7 +2873,7 @@ qio_channel_rdma_source_prepare(GSource *source, GIOCondition cond = 0; *timeout = -1; - rcu_read_lock(); + RCU_READ_LOCK_AUTO if (rsource->condition == G_IO_IN) { rdma = atomic_rcu_read(&rsource->rioc->rdmain); } else { @@ -2891,7 +2882,6 @@ qio_channel_rdma_source_prepare(GSource *source, if (!rdma) { error_report("RDMAContext is NULL when prepare Gsource"); - rcu_read_unlock(); return FALSE; } @@ -2900,7 +2890,6 @@ qio_channel_rdma_source_prepare(GSource *source, } cond |= G_IO_OUT; - rcu_read_unlock(); return cond & rsource->condition; } @@ -2911,7 +2900,7 @@ qio_channel_rdma_source_check(GSource *source) RDMAContext *rdma; GIOCondition cond = 0; - rcu_read_lock(); + RCU_READ_LOCK_AUTO if (rsource->condition == G_IO_IN) { rdma = atomic_rcu_read(&rsource->rioc->rdmain); } else { @@ -2920,7 +2909,6 @@ qio_channel_rdma_source_check(GSource *source) if (!rdma) { error_report("RDMAContext is NULL when check Gsource"); - rcu_read_unlock(); return FALSE; } @@ -2929,7 +2917,6 @@ qio_channel_rdma_source_check(GSource *source) } cond |= G_IO_OUT; - rcu_read_unlock(); return cond & rsource->condition; } @@ -2943,7 +2930,7 @@ qio_channel_rdma_source_dispatch(GSource *source, RDMAContext *rdma; GIOCondition cond = 0; - rcu_read_lock(); + RCU_READ_LOCK_AUTO if (rsource->condition == G_IO_IN) { rdma = atomic_rcu_read(&rsource->rioc->rdmain); } else { @@ -2952,7 +2939,6 @@ qio_channel_rdma_source_dispatch(GSource *source, if (!rdma) { error_report("RDMAContext is NULL when dispatch Gsource"); - rcu_read_unlock(); return FALSE; } @@ -2961,7 +2947,6 @@ qio_channel_rdma_source_dispatch(GSource *source, } cond |= G_IO_OUT; - rcu_read_unlock(); return (*func)(QIO_CHANNEL(rsource->rioc), (cond & rsource->condition), user_data); @@ -3058,7 +3043,7 @@ qio_channel_rdma_shutdown(QIOChannel *ioc, QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); RDMAContext *rdmain, *rdmaout; - rcu_read_lock(); + RCU_READ_LOCK_AUTO rdmain = atomic_rcu_read(&rioc->rdmain); rdmaout = atomic_rcu_read(&rioc->rdmain); @@ -3085,7 +3070,6 @@ qio_channel_rdma_shutdown(QIOChannel *ioc, break; } - rcu_read_unlock(); return 0; } @@ -3131,18 +3115,16 @@ static size_t qemu_rdma_save_page(QEMUFile *f, void *opaque, RDMAContext *rdma; int ret; - rcu_read_lock(); + RCU_READ_LOCK_AUTO rdma = atomic_rcu_read(&rioc->rdmaout); if (!rdma) { - rcu_read_unlock(); return -EIO; } CHECK_ERROR_STATE(); if (migration_in_postcopy()) { - rcu_read_unlock(); return RAM_SAVE_CONTROL_NOT_SUPP; } @@ -3227,11 +3209,9 @@ static size_t qemu_rdma_save_page(QEMUFile *f, void *opaque, } } - rcu_read_unlock(); return RAM_SAVE_CONTROL_DELAYED; err: rdma->error_state = ret; - rcu_read_unlock(); return ret; } @@ -3451,11 +3431,10 @@ static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque) int count = 0; int i = 0; - rcu_read_lock(); + RCU_READ_LOCK_AUTO rdma = atomic_rcu_read(&rioc->rdmain); if (!rdma) { - rcu_read_unlock(); return -EIO; } @@ -3698,7 +3677,6 @@ out: if (ret < 0) { rdma->error_state = ret; } - rcu_read_unlock(); return ret; } @@ -3716,11 +3694,10 @@ rdma_block_notification_handle(QIOChannelRDMA *rioc, const char *name) int curr; int found = -1; - rcu_read_lock(); + RCU_READ_LOCK_AUTO rdma = atomic_rcu_read(&rioc->rdmain); if (!rdma) { - rcu_read_unlock(); return -EIO; } @@ -3734,7 +3711,6 @@ rdma_block_notification_handle(QIOChannelRDMA *rioc, const char *name) if (found == -1) { error_report("RAMBlock '%s' not found on destination", name); - rcu_read_unlock(); return -ENOENT; } @@ -3742,7 +3718,6 @@ rdma_block_notification_handle(QIOChannelRDMA *rioc, const char *name) trace_rdma_block_notification_handle(name, rdma->next_src_index); rdma->next_src_index++; - rcu_read_unlock(); return 0; } @@ -3767,17 +3742,15 @@ static int qemu_rdma_registration_start(QEMUFile *f, void *opaque, QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque); RDMAContext *rdma; - rcu_read_lock(); + RCU_READ_LOCK_AUTO rdma = atomic_rcu_read(&rioc->rdmaout); if (!rdma) { - rcu_read_unlock(); return -EIO; } CHECK_ERROR_STATE(); if (migration_in_postcopy()) { - rcu_read_unlock(); return 0; } @@ -3785,7 +3758,6 @@ static int qemu_rdma_registration_start(QEMUFile *f, void *opaque, qemu_put_be64(f, RAM_SAVE_FLAG_HOOK); qemu_fflush(f); - rcu_read_unlock(); return 0; } @@ -3802,17 +3774,15 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, RDMAControlHeader head = { .len = 0, .repeat = 1 }; int ret = 0; - rcu_read_lock(); + RCU_READ_LOCK_AUTO rdma = atomic_rcu_read(&rioc->rdmaout); if (!rdma) { - rcu_read_unlock(); return -EIO; } CHECK_ERROR_STATE(); if (migration_in_postcopy()) { - rcu_read_unlock(); return 0; } @@ -3844,7 +3814,6 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, qemu_rdma_reg_whole_ram_blocks : NULL); if (ret < 0) { ERROR(errp, "receiving remote info!"); - rcu_read_unlock(); return ret; } @@ -3868,7 +3837,6 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, "not identical on both the source and destination.", local->nb_blocks, nb_dest_blocks); rdma->error_state = -EINVAL; - rcu_read_unlock(); return -EINVAL; } @@ -3885,7 +3853,6 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, local->block[i].length, rdma->dest_blocks[i].length); rdma->error_state = -EINVAL; - rcu_read_unlock(); return -EINVAL; } local->block[i].remote_host_addr = @@ -3903,11 +3870,9 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, goto err; } - rcu_read_unlock(); return 0; err: rdma->error_state = ret; - rcu_read_unlock(); return ret; }