From nobody Mon Apr 13 13:21:46 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9443C433FE for ; Fri, 11 Nov 2022 14:27:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234539AbiKKO1q (ORCPT ); Fri, 11 Nov 2022 09:27:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231911AbiKKO1b (ORCPT ); Fri, 11 Nov 2022 09:27:31 -0500 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D96B1BA; Fri, 11 Nov 2022 06:27:29 -0800 (PST) Received: from kwepemi100025.china.huawei.com (unknown [172.30.72.53]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4N81Cj0yfKzbng6; Fri, 11 Nov 2022 22:23:45 +0800 (CST) Received: from DESKTOP-27KDQMV.china.huawei.com (10.174.148.223) by kwepemi100025.china.huawei.com (7.221.188.158) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Fri, 11 Nov 2022 22:27:27 +0800 From: "Longpeng(Mike)" To: CC: , , , , , , , , Longpeng Subject: [RFC 2/4] pci/sriov: add vf_bitmap to mark the vf id allocation Date: Fri, 11 Nov 2022 22:27:20 +0800 Message-ID: <20221111142722.1172-3-longpeng2@huawei.com> X-Mailer: git-send-email 2.25.0.windows.1 In-Reply-To: <20221111142722.1172-1-longpeng2@huawei.com> References: <20221111142722.1172-1-longpeng2@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.174.148.223] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemi100025.china.huawei.com (7.221.188.158) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Longpeng Add a bitmap to mark the vf id allocation, the can be use to avoid the repeated allocations. Signed-off-by: Longpeng --- drivers/pci/iov.c | 13 +++++++++++++ drivers/pci/pci.h | 1 + 2 files changed, 14 insertions(+) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 3b441cd92960..886489aae0de 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -341,6 +341,8 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id) =20 pci_bus_add_device(virtfn); =20 + __set_bit(id, iov->vf_bitmap); + return 0; =20 failed1: @@ -357,6 +359,7 @@ void pci_iov_remove_virtfn(struct pci_dev *dev, int id) { char buf[VIRTFN_ID_LEN]; struct pci_dev *virtfn; + struct pci_sriov *iov; =20 virtfn =3D pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus), pci_iov_virtfn_bus(dev, id), @@ -364,6 +367,9 @@ void pci_iov_remove_virtfn(struct pci_dev *dev, int id) if (!virtfn) return; =20 + iov =3D pci_physfn(dev)->sriov; + __clear_bit(id, iov->vf_bitmap); + sprintf(buf, "virtfn%u", id); sysfs_remove_link(&dev->dev.kobj, buf); /* @@ -791,6 +797,11 @@ static int sriov_init(struct pci_dev *dev, int pos) if (!iov) return -ENOMEM; =20 + rc =3D -ENOMEM; + iov->vf_bitmap =3D bitmap_zalloc(total, GFP_KERNEL); + if (!iov->vf_bitmap) + goto free_iov; + nres =3D 0; for (i =3D 0; i < PCI_SRIOV_NUM_BARS; i++) { res =3D &dev->resource[i + PCI_IOV_RESOURCES]; @@ -853,6 +864,7 @@ static int sriov_init(struct pci_dev *dev, int pos) res->flags =3D 0; } =20 +free_iov: kfree(iov); return rc; } @@ -864,6 +876,7 @@ static void sriov_release(struct pci_dev *dev) if (dev !=3D dev->sriov->dev) pci_dev_put(dev->sriov->dev); =20 + bitmap_free(dev->sriov->vf_bitmap); kfree(dev->sriov); dev->sriov =3D NULL; } diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index b1ebb7ab8805..a76d4ff83886 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -301,6 +301,7 @@ struct pci_sriov { u16 subsystem_device; /* VF subsystem device */ resource_size_t barsz[PCI_SRIOV_NUM_BARS]; /* VF BAR size */ bool drivers_autoprobe; /* Auto probing of VFs by driver */ + unsigned long *vf_bitmap; /* Allocated VFs */ }; =20 /** --=20 2.23.0