From patchwork Mon Dec 14 04:57:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gibson X-Patchwork-Id: 11971293 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 4AD3BC1B0D9 for ; Mon, 14 Dec 2020 05:10:25 +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 A48D422472 for ; Mon, 14 Dec 2020 05:10:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A48D422472 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:48648 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kog7r-0004rF-Mg for qemu-devel@archiver.kernel.org; Mon, 14 Dec 2020 00:10:23 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:39426) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kofwX-0005J2-JF; Sun, 13 Dec 2020 23:58:41 -0500 Received: from ozlabs.org ([2401:3900:2:1::2]:60599) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kofwU-0004sL-Ds; Sun, 13 Dec 2020 23:58:41 -0500 Received: by ozlabs.org (Postfix, from userid 1007) id 4CvTfs3MT7z9sWb; Mon, 14 Dec 2020 15:58:13 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1607921893; bh=aEDEWIWdP1SHfIAhW4nIBEp6mHHBQVwYeiucZCW6Wck=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nx9GHwCADEPDpBMg6B+A4swjI77vy2swXFBvTD2Gqfkc2DHCkcbkvA27c9iTqU24B XSyz0BHX5hUNNrO7/pD34tZOfsHyjuOswSbevoX8X7k3DZBixOHrgNph6J966sx7ko /xh7hhBw764JecKjqq9caUiTG4w9RCExbyZ5zsrc= From: David Gibson To: peter.maydell@linaro.org Subject: [PULL 20/30] spapr: spapr_drc_attach() cannot fail Date: Mon, 14 Dec 2020 15:57:57 +1100 Message-Id: <20201214045807.41003-21-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201214045807.41003-1-david@gibson.dropbear.id.au> References: <20201214045807.41003-1-david@gibson.dropbear.id.au> MIME-Version: 1.0 Received-SPF: pass client-ip=2401:3900:2:1::2; envelope-from=dgibson@ozlabs.org; helo=ozlabs.org X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 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: David Gibson , qemu-ppc@nongnu.org, qemu-devel@nongnu.org, groug@kaod.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Greg Kurz 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 Message-Id: <20201201113728.885700-5-groug@kaod.org> Signed-off-by: David Gibson --- hw/ppc/spapr.c | 6 +++--- hw/ppc/spapr_drc.c | 8 ++------ hw/ppc/spapr_nvdimm.c | 2 +- hw/ppc/spapr_pci.c | 2 +- include/hw/ppc/spapr_drc.h | 8 +++++++- 5 files changed, 14 insertions(+), 12 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 1f8bd53cb8..dfedded9a8 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -3398,7 +3398,7 @@ 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); } @@ -3766,7 +3766,7 @@ 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) { /* @@ -3931,7 +3931,7 @@ 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 77718cde1f..f991cf89a0 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 2f1c196e1b..73ee006541 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 2829f298d9..e946bd5055 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. diff --git a/include/hw/ppc/spapr_drc.h b/include/hw/ppc/spapr_drc.h index 165b281496..def3593adc 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 */