From patchwork Fri Feb 24 15:37:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Igor Mammedov X-Patchwork-Id: 13151416 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 2B15EC61DA4 for ; Fri, 24 Feb 2023 15:40:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pVa9b-0003us-N7; Fri, 24 Feb 2023 10:38:35 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pVa9Z-0003sl-1H for qemu-devel@nongnu.org; Fri, 24 Feb 2023 10:38:33 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pVa9W-0007GS-2r for qemu-devel@nongnu.org; Fri, 24 Feb 2023 10:38:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1677253106; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=I/iHFVoo2AbCn5b07zNtKbVrpFG1xlU788qejXAOH+k=; b=TPZfa7hmdW307FHXxFaOdXgPrxfRcQlFx4DqeMfbiJ2cMZA84Vr7nDTpID03dkt6sfjGnp n9PDS4Dxi0VkUV4HQQYIWlo3/BFM8F7MgC/+pwdb6t8CcbYRisxtk3VTRVcjh02r19KoOR uUHGHORHkPoHWEC9uRf+X+/nXjGbIkc= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-457-jZ9Rxqt-Nqavda9NTnsVXA-1; Fri, 24 Feb 2023 10:38:24 -0500 X-MC-Unique: jZ9Rxqt-Nqavda9NTnsVXA-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 3B99485A588; Fri, 24 Feb 2023 15:38:24 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq2.redhat.com (dell-r430-03.lab.eng.brq2.redhat.com [10.37.153.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 90DE3492B12; Fri, 24 Feb 2023 15:38:23 +0000 (UTC) From: Igor Mammedov To: qemu-devel@nongnu.org Cc: mst@redhat.com, ani@anisinha.ca, berrange@redhat.com Subject: [PATCH 11/33] pci: fix 'hotplugglable' property behavior Date: Fri, 24 Feb 2023 16:37:50 +0100 Message-Id: <20230224153812.4176226-12-imammedo@redhat.com> In-Reply-To: <20230224153812.4176226-1-imammedo@redhat.com> References: <20230224153812.4176226-1-imammedo@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Received-SPF: pass client-ip=170.10.129.124; envelope-from=imammedo@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Currently the property may flip its state during VM bring up or just doesn't work as the name implies. In particular with PCIE root port that has 'hotplug={on|off}' property, and when it's turned off, one would expect 'hotpluggable' == false for any devices attached to it. Which is not the case since qbus_is_hotpluggable() used by the property just checks for presence of any hotplug_handler set on bus. The problem is that name BusState::hotplug_handler from its inception is misnomer, as it handles not only hotplug but also in many cases coldplug as well (i.e. generic wiring interface), and it's fine to have hotplug_handler set on bus while it doesn't support hotplug (ex. pcie-slot with hotplug=off). Another case of root port flipping 'hotpluggable' state when ACPI PCI hotplug is enabled in this case root port with 'hotplug=off' starts as hotpluggable and then later on, pcihp hotplug_handler clears hotplug_handler explicitly after checking root port's 'hotplug' property. So root-port hotpluggablity check sort of works if pcihp is enabled but is broken if pcihp is disabled. One way to deal with the issue is to ask hotplug_handler if bus it controls is hotpluggable or not. To do that add is_hotpluggable_bus() hook to HotplugHandler interface and use it in 'hotpluggable' property + teach pcie-slot to actually look into 'hotplug' property state before deciding if bus is hotpluggable. Signed-off-by: Igor Mammedov --- include/hw/hotplug.h | 2 ++ include/hw/qdev-core.h | 13 ++++++++++++- hw/pci/pcie_port.c | 8 ++++++++ 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/include/hw/hotplug.h b/include/hw/hotplug.h index e15f59c8b3..a9840ed485 100644 --- a/include/hw/hotplug.h +++ b/include/hw/hotplug.h @@ -48,6 +48,7 @@ typedef void (*hotplug_fn)(HotplugHandler *plug_handler, * @unplug: unplug callback. * Used for device removal with devices that implement * asynchronous and synchronous (surprise) removal. + * @is_hotpluggable_bus: called to check if bus/its parent allow hotplug on bus */ struct HotplugHandlerClass { /* */ @@ -58,6 +59,7 @@ struct HotplugHandlerClass { hotplug_fn plug; hotplug_fn unplug_request; hotplug_fn unplug; + bool (*is_hotpluggable_bus)(HotplugHandler *plug_handler, BusState *bus); }; /** diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index 35fddb19a6..3b3518146b 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -812,7 +812,18 @@ void qbus_set_bus_hotplug_handler(BusState *bus); static inline bool qbus_is_hotpluggable(BusState *bus) { - return bus->hotplug_handler; + HotplugHandler *plug_handler = bus->hotplug_handler; + bool ret = !!plug_handler; + + if (plug_handler) { + HotplugHandlerClass *hdc; + + hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler); + if (hdc->is_hotpluggable_bus) { + ret = hdc->is_hotpluggable_bus(plug_handler, bus); + } + } + return ret; } /** diff --git a/hw/pci/pcie_port.c b/hw/pci/pcie_port.c index 65a397ad23..000633fec1 100644 --- a/hw/pci/pcie_port.c +++ b/hw/pci/pcie_port.c @@ -161,6 +161,13 @@ PCIDevice *pcie_find_port_by_pn(PCIBus *bus, uint8_t pn) return NULL; } +static bool pcie_slot_is_hotpluggbale_bus(HotplugHandler *plug_handler, + BusState *bus) +{ + PCIESlot *s = PCIE_SLOT(bus->parent); + return s->hotplug; +} + static const TypeInfo pcie_port_type_info = { .name = TYPE_PCIE_PORT, .parent = TYPE_PCI_BRIDGE, @@ -188,6 +195,7 @@ static void pcie_slot_class_init(ObjectClass *oc, void *data) hc->plug = pcie_cap_slot_plug_cb; hc->unplug = pcie_cap_slot_unplug_cb; hc->unplug_request = pcie_cap_slot_unplug_request_cb; + hc->is_hotpluggable_bus = pcie_slot_is_hotpluggbale_bus; } static const TypeInfo pcie_slot_type_info = {