From patchwork Fri May 19 21:57:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Williamson X-Patchwork-Id: 13248902 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 192A0C77B75 for ; Fri, 19 May 2023 21:58:39 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q086o-0005zD-6p; Fri, 19 May 2023 17:57:58 -0400 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 1q086m-0005yK-GP for qemu-devel@nongnu.org; Fri, 19 May 2023 17:57:56 -0400 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 1q086l-0004FT-1u for qemu-devel@nongnu.org; Fri, 19 May 2023 17:57:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1684533474; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fgLJMJytCtabs3p65dU+5yU7aU1Lzei6dYgf+/EPmqw=; b=SKNHp9vrxIKmdZuNPM8S8tKrHRa1yakv/M9E5BM6oTZVzskPR271d13yDI9MrsRPi/St8l GGBi/Cz48gV14ch7TRIPTOPAnyaWQEChyJNydVnrRDIWbBVi4aUOHW/YCMnu5A2Q8gwfAm X9RdGoNtaCb0E2EWuIAnK01MCSueRfo= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-205-yoCbIoAGMYi19gyO_PTBUQ-1; Fri, 19 May 2023 17:57:50 -0400 X-MC-Unique: yoCbIoAGMYi19gyO_PTBUQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 3042A2A5954B; Fri, 19 May 2023 21:57:50 +0000 (UTC) Received: from omen.home.shazbot.org (unknown [10.22.10.168]) by smtp.corp.redhat.com (Postfix) with ESMTP id C854AC0004B; Fri, 19 May 2023 21:57:49 +0000 (UTC) From: Alex Williamson To: robin@streamhpc.com, mst@redhat.com, marcel.apfelbaum@gmail.com Cc: Alex Williamson , qemu-devel@nongnu.org Subject: [RFC PATCH 4/4] vfio/pci: Enable AtomicOps completers on root ports Date: Fri, 19 May 2023 15:57:39 -0600 Message-Id: <20230519215739.402729-5-alex.williamson@redhat.com> In-Reply-To: <20230519215739.402729-1-alex.williamson@redhat.com> References: <20230519215739.402729-1-alex.williamson@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Received-SPF: pass client-ip=170.10.129.124; envelope-from=alex.williamson@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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 For cold-plug configurations where the vfio-pci device reports enabled support for PCIe AtomicOps completers and we have a compatible VM configuration, mirror the host AtomicOps completer support in the virtual root port. Signed-off-by: Alex Williamson --- hw/vfio/pci.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index bf27a3990564..61d045785bf8 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -1826,6 +1826,70 @@ static void vfio_add_emulated_long(VFIOPCIDevice *vdev, int pos, vfio_set_long_bits(vdev->emulated_config_bits + pos, mask, mask); } +/* + * For a cold-plugged device connected directly to a root port where + * vfio-pci reports AtomicOp completer support on the host, twiddle + * bits in the emulated root port to reflect this capability. + */ +static void vfio_pci_enable_rp_atomics(VFIOPCIDevice *vdev) +{ + struct vfio_device_info_cap_pci_atomic_comp *cap; + g_autofree struct vfio_device_info *info = NULL; + struct vfio_info_cap_header *hdr; + PCIDevice *parent; + uint32_t mask = 0; + PCIBus *bus; + + /* + * XXX + * - Should this also be restricted to TYPE_VFIO_PCI_NOHOTPLUG devices? + * - Should we clear the capability on exit? + */ + if (vdev->pdev.qdev.hotplugged) { + return; + } + + info = vfio_get_device_info(vdev->vbasedev.fd); + if (!info) { + return; + } + + hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_PCI_ATOMIC_COMP); + if (!hdr) { + return; + } + + cap = (void *)hdr; + if (cap->flags & VFIO_PCI_ATOMIC_COMP32) { + mask |= PCI_EXP_DEVCAP2_ATOMIC_COMP32; + } + if (cap->flags & VFIO_PCI_ATOMIC_COMP64) { + mask |= PCI_EXP_DEVCAP2_ATOMIC_COMP64; + } + if (cap->flags & VFIO_PCI_ATOMIC_COMP128) { + mask |= PCI_EXP_DEVCAP2_ATOMIC_COMP128; + } + + if (!mask) { + return; + } + + bus = pci_get_bus(&vdev->pdev); + parent = bus->parent_dev; + + if (!parent || !pci_is_express(parent) || !parent->exp.exp_cap) { + return; + } + + if (pcie_cap_get_type(parent) != PCI_EXP_TYPE_ROOT_PORT || + pcie_cap_get_version(parent) != PCI_EXP_FLAGS_VER2) { + return; + } + + pci_long_test_and_set_mask(parent->config + parent->exp.exp_cap + + PCI_EXP_DEVCAP2, mask); +} + static int vfio_setup_pcie_cap(VFIOPCIDevice *vdev, int pos, uint8_t size, Error **errp) { @@ -1929,6 +1993,8 @@ static int vfio_setup_pcie_cap(VFIOPCIDevice *vdev, int pos, uint8_t size, QEMU_PCI_EXP_LNKCAP_MLS(QEMU_PCI_EXP_LNK_2_5GT), ~0); vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0); } + + vfio_pci_enable_rp_atomics(vdev); } /*