From patchwork Mon Feb 29 18:40:33 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 8457531 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id EFBADC0553 for ; Mon, 29 Feb 2016 18:58:53 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3977820204 for ; Mon, 29 Feb 2016 18:58:53 +0000 (UTC) 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.kernel.org (Postfix) with ESMTPS id 717CC201F2 for ; Mon, 29 Feb 2016 18:58:52 +0000 (UTC) Received: from localhost ([::1]:38539 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aaT1v-0007aO-V2 for patchwork-qemu-devel@patchwork.kernel.org; Mon, 29 Feb 2016 13:58:51 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59719) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aaSki-00021Y-2m for qemu-devel@nongnu.org; Mon, 29 Feb 2016 13:41:09 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aaSkg-0007qU-Qy for qemu-devel@nongnu.org; Mon, 29 Feb 2016 13:41:03 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58168) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aaSkg-0007pu-JF for qemu-devel@nongnu.org; Mon, 29 Feb 2016 13:41:02 -0500 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (Postfix) with ESMTPS id 348C0C0005D5; Mon, 29 Feb 2016 18:41:02 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-116-22.ams2.redhat.com [10.36.116.22]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u1TIexrB025375 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 29 Feb 2016 13:41:00 -0500 Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 30BC33004F9C; Mon, 29 Feb 2016 19:40:55 +0100 (CET) From: Markus Armbruster To: qemu-devel@nongnu.org Date: Mon, 29 Feb 2016 19:40:33 +0100 Message-Id: <1456771254-17511-18-git-send-email-armbru@redhat.com> In-Reply-To: <1456771254-17511-1-git-send-email-armbru@redhat.com> References: <1456771254-17511-1-git-send-email-armbru@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Cc: claudio.fontana@huawei.com, cam@cs.ualberta.ca, mlureau@redhat.com, david.marchand@6wind.com, pbonzini@redhat.com Subject: [Qemu-devel] [PATCH 17/38] ivshmem: Clean up MSI-X conditions X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP There are three predicates related to MSI-X: * ivshmem_has_feature(s, IVSHMEM_MSI) is true unless the non-MSI-X variant of the device is selected with msi=off. * msix_present() is true when the device has the PCI capability MSI-X. It's initially false, and becomes true during successful realize of the MSI-X variant of the device. Thus, it's the same as ivshmem_has_feature(s, IVSHMEM_MSI) for realized devices. * msix_enabled() is true when msix_present() is true and guest software has enabled MSI-X. Code that differs between the non-MSI-X and the MSI-X variant of the device needs to be guarded by ivshmem_has_feature(s, IVSHMEM_MSI) or by msix_present(), except the latter works only for realized devices. Code that depends on whether MSI-X is in use needs to be guarded with msix_enabled(). Code review led me to two minor messes: * ivshmem_vector_notify() calls msix_notify() even when !msix_enabled(), unlike most other MSI-X-capable devices. As far as I can tell, msix_notify() does nothing when !msix_enabled(). Add the guard anyway. * Most callers of ivshmem_use_msix() guard it with ivshmem_has_feature(s, IVSHMEM_MSI). Not necessary, because ivshmem_use_msix() does nothing when !msix_present(). That's ivshmem's only use of msix_present(), though. Rename ivshmem_use_msix() to ivshmem_vector_use(), replace msix_present() by ivshmem_has_feature() there, and drop the redundant guards. Signed-off-by: Markus Armbruster --- hw/misc/ivshmem.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 7191914..cfea151 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -274,7 +274,9 @@ static void ivshmem_vector_notify(void *opaque) IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, vector); if (ivshmem_has_feature(s, IVSHMEM_MSI)) { - msix_notify(pdev, vector); + if (msix_enabled(pdev)) { + msix_notify(pdev, vector); + } } else { ivshmem_IntrStatus_write(s, 1); } @@ -712,13 +714,12 @@ static void ivshmem_check_version(void *opaque, const uint8_t * buf, int size) /* Select the MSI-X vectors used by device. * ivshmem maps events to vectors statically, so * we just enable all vectors on init and after reset. */ -static void ivshmem_use_msix(IVShmemState * s) +static void ivshmem_vector_use(IVShmemState *s) { PCIDevice *d = PCI_DEVICE(s); int i; - IVSHMEM_DPRINTF("%s, msix present: %d\n", __func__, msix_present(d)); - if (!msix_present(d)) { + if (!ivshmem_has_feature(s, IVSHMEM_MSI)) { return; } @@ -733,7 +734,7 @@ static void ivshmem_reset(DeviceState *d) s->intrstatus = 0; s->intrmask = 0; - ivshmem_use_msix(s); + ivshmem_vector_use(s); } static int ivshmem_setup_interrupts(IVShmemState *s) @@ -747,9 +748,9 @@ static int ivshmem_setup_interrupts(IVShmemState *s) } IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors); - ivshmem_use_msix(s); } + ivshmem_vector_use(s); return 0; } @@ -1034,12 +1035,7 @@ static int ivshmem_pre_load(void *opaque) static int ivshmem_post_load(void *opaque, int version_id) { - IVShmemState *s = opaque; - - if (ivshmem_has_feature(s, IVSHMEM_MSI)) { - ivshmem_use_msix(s); - } - + ivshmem_vector_use(opaque); return 0; } @@ -1067,11 +1063,11 @@ static int ivshmem_load_old(QEMUFile *f, void *opaque, int version_id) if (ivshmem_has_feature(s, IVSHMEM_MSI)) { msix_load(pdev, f); - ivshmem_use_msix(s); } else { s->intrstatus = qemu_get_be32(f); s->intrmask = qemu_get_be32(f); } + ivshmem_vector_use(s); return 0; }