From patchwork Fri Nov 20 23:42:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kurz X-Patchwork-Id: 11922927 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94C8AC5519F for ; Fri, 20 Nov 2020 23:51:00 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 18506208CA for ; Fri, 20 Nov 2020 23:51:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 18506208CA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kaod.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:55794 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kgGB9-0007BN-5Y for qemu-devel@archiver.kernel.org; Fri, 20 Nov 2020 18:50:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:42992) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kgG32-0006CH-32 for qemu-devel@nongnu.org; Fri, 20 Nov 2020 18:42:36 -0500 Received: from us-smtp-delivery-44.mimecast.com ([205.139.111.44]:23481) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kgG2y-0003ri-Af for qemu-devel@nongnu.org; Fri, 20 Nov 2020 18:42:35 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-222-sJ6QseE9NEiTFkV_EfkmOg-1; Fri, 20 Nov 2020 18:42:27 -0500 X-MC-Unique: sJ6QseE9NEiTFkV_EfkmOg-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id C7BD580ED9D; Fri, 20 Nov 2020 23:42:26 +0000 (UTC) Received: from bahia.redhat.com (ovpn-112-44.ams2.redhat.com [10.36.112.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9F25060BFA; Fri, 20 Nov 2020 23:42:25 +0000 (UTC) From: Greg Kurz To: qemu-devel@nongnu.org Subject: [PATCH for-6.0 9/9] spapr: spapr_drc_attach() cannot fail Date: Sat, 21 Nov 2020 00:42:08 +0100 Message-Id: <20201120234208.683521-10-groug@kaod.org> In-Reply-To: <20201120234208.683521-1-groug@kaod.org> References: <20201120234208.683521-1-groug@kaod.org> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kaod.org Received-SPF: softfail client-ip=205.139.111.44; envelope-from=groug@kaod.org; helo=us-smtp-delivery-44.mimecast.com X-Spam_score_int: -11 X-Spam_score: -1.2 X-Spam_bar: - X-Spam_report: (-1.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=no autolearn_force=no X-Spam_action: no action 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: , Cc: Igor Mammedov , qemu-ppc@nongnu.org, Greg Kurz , David Gibson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" All users are passing &error_abort already. Document the fact that spapr_drc_attach() should only be passed a free DRC, which is supposedly the case if appropriate checking is done earlier. Signed-off-by: Greg Kurz --- include/hw/ppc/spapr_drc.h | 8 +++++++- hw/ppc/spapr.c | 6 +++--- hw/ppc/spapr_drc.c | 8 ++------ hw/ppc/spapr_nvdimm.c | 2 +- hw/ppc/spapr_pci.c | 2 +- 5 files changed, 14 insertions(+), 12 deletions(-) diff --git a/include/hw/ppc/spapr_drc.h b/include/hw/ppc/spapr_drc.h index 165b281496bb..def3593adc8b 100644 --- a/include/hw/ppc/spapr_drc.h +++ b/include/hw/ppc/spapr_drc.h @@ -235,7 +235,13 @@ SpaprDrc *spapr_drc_by_index(uint32_t index); SpaprDrc *spapr_drc_by_id(const char *type, uint32_t id); int spapr_dt_drc(void *fdt, int offset, Object *owner, uint32_t drc_type_mask); -bool spapr_drc_attach(SpaprDrc *drc, DeviceState *d, Error **errp); +/* + * These functions respectively abort if called with a device already + * attached or no device attached. In the case of spapr_drc_attach(), + * this means that the attachability of the DRC *must* be checked + * beforehand (eg. check drc->dev at pre-plug). + */ +void spapr_drc_attach(SpaprDrc *drc, DeviceState *d); void spapr_drc_detach(SpaprDrc *drc); /* Returns true if a hot plug/unplug request is pending */ diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 5e32d1d396b4..e0047f41073e 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -3399,7 +3399,7 @@ static void spapr_add_lmbs(DeviceState *dev, uint64_t addr_start, uint64_t size, * that doesn't overlap with any existing mapping at pre-plug. The * corresponding LMB DRCs are thus assumed to be all attachable. */ - spapr_drc_attach(drc, dev, &error_abort); + spapr_drc_attach(drc, dev); if (!hotplugged) { spapr_drc_reset(drc); } @@ -3767,7 +3767,7 @@ static void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev) * core being plugged into a free slot. Nothing should already * be attached to the corresponding DRC. */ - spapr_drc_attach(drc, dev, &error_abort); + spapr_drc_attach(drc, dev); if (hotplugged) { /* @@ -3920,7 +3920,7 @@ static void spapr_phb_plug(HotplugHandler *hotplug_dev, DeviceState *dev) assert(drc); /* spapr_phb_pre_plug() already checked the DRC is attachable */ - spapr_drc_attach(drc, dev, &error_abort); + spapr_drc_attach(drc, dev); if (hotplugged) { spapr_hotplug_req_add_by_index(drc); diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c index 77718cde1ff2..f991cf89a08a 100644 --- a/hw/ppc/spapr_drc.c +++ b/hw/ppc/spapr_drc.c @@ -369,14 +369,11 @@ static void prop_get_fdt(Object *obj, Visitor *v, const char *name, } while (fdt_depth != 0); } -bool spapr_drc_attach(SpaprDrc *drc, DeviceState *d, Error **errp) +void spapr_drc_attach(SpaprDrc *drc, DeviceState *d) { trace_spapr_drc_attach(spapr_drc_index(drc)); - if (drc->dev) { - error_setg(errp, "an attached device is still awaiting release"); - return false; - } + g_assert(!drc->dev); g_assert((drc->state == SPAPR_DRC_STATE_LOGICAL_UNUSABLE) || (drc->state == SPAPR_DRC_STATE_PHYSICAL_POWERON)); @@ -386,7 +383,6 @@ bool spapr_drc_attach(SpaprDrc *drc, DeviceState *d, Error **errp) object_get_typename(OBJECT(drc->dev)), (Object **)(&drc->dev), NULL, 0); - return true; } static void spapr_drc_release(SpaprDrc *drc) diff --git a/hw/ppc/spapr_nvdimm.c b/hw/ppc/spapr_nvdimm.c index 2f1c196e1b76..73ee006541a6 100644 --- a/hw/ppc/spapr_nvdimm.c +++ b/hw/ppc/spapr_nvdimm.c @@ -101,7 +101,7 @@ void spapr_add_nvdimm(DeviceState *dev, uint64_t slot) * pc_dimm_get_free_slot() provided a free slot at pre-plug. The * corresponding DRC is thus assumed to be attachable. */ - spapr_drc_attach(drc, dev, &error_abort); + spapr_drc_attach(drc, dev); if (hotplugged) { spapr_hotplug_req_add_by_index(drc); diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c index 2829f298d9c1..e946bd5055cc 100644 --- a/hw/ppc/spapr_pci.c +++ b/hw/ppc/spapr_pci.c @@ -1601,7 +1601,7 @@ static void spapr_pci_plug(HotplugHandler *plug_handler, } /* spapr_pci_pre_plug() already checked the DRC is attachable */ - spapr_drc_attach(drc, DEVICE(pdev), &error_abort); + spapr_drc_attach(drc, DEVICE(pdev)); /* If this is function 0, signal hotplug for all the device functions. * Otherwise defer sending the hotplug event.