From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.7 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 7180DC43387 for ; Mon, 7 Jan 2019 06:44:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3ED592085A for ; Mon, 7 Jan 2019 06:44:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="W8zH/Zjh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726754AbfAGGos (ORCPT ); Mon, 7 Jan 2019 01:44:48 -0500 Received: from fllv0016.ext.ti.com ([198.47.19.142]:36896 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726446AbfAGGor (ORCPT ); Mon, 7 Jan 2019 01:44:47 -0500 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id x076hI62021681; Mon, 7 Jan 2019 00:43:18 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1546843398; bh=wJzish8jKdOVXhvaJ7MTD1mt6K3UYjBXhrK5Hbnol9E=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=W8zH/Zjhszg3u1sMPVtKto0NvGJTmMf2q8FabmjBspWvtjOuZEawEp7qr8Is7V051 iR6iWyfnmPSyXHJn77KzkxoeZJcMUbWEEiy3GhD2H8kjeBMbp3PzICw/OUfXtQmAjk 4f2Z/MQM7roIY3iOkoZyJMEsdMcoApmw/0tIzftA= Received: from DFLE101.ent.ti.com (dfle101.ent.ti.com [10.64.6.22]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x076hHit048943 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 7 Jan 2019 00:43:17 -0600 Received: from DFLE105.ent.ti.com (10.64.6.26) by DFLE101.ent.ti.com (10.64.6.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1591.10; Mon, 7 Jan 2019 00:43:17 -0600 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE105.ent.ti.com (10.64.6.26) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1591.10 via Frontend Transport; Mon, 7 Jan 2019 00:43:17 -0600 Received: from a0393678ub.india.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id x076gfo4002672; Mon, 7 Jan 2019 00:43:14 -0600 From: Kishon Vijay Abraham I To: Lorenzo Pieralisi , Bjorn Helgaas , Gustavo Pimentel , Alan Douglas , Shawn Lin CC: Jingoo Han , Heiko Stuebner , Cyrille Pitchen , Jia-Ju Bai , , , , , , Subject: [PATCH 07/15] PCI: endpoint: Add helper to get first unreserved BAR Date: Mon, 7 Jan 2019 12:11:40 +0530 Message-ID: <20190107064148.10152-8-kishon@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190107064148.10152-1-kishon@ti.com> References: <20190107064148.10152-1-kishon@ti.com> MIME-Version: 1.0 Content-Type: text/plain X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a helper function pci_epc_get_first_free_bar(), to get the first unreserved BAR that can be used for endpoint function. Signed-off-by: Kishon Vijay Abraham I --- drivers/pci/endpoint/pci-epc-core.c | 22 ++++++++++++++++++++++ include/linux/pci-epc.h | 1 + 2 files changed, 23 insertions(+) diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index 5a099479d9ab..b1632f91e33e 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -83,6 +83,28 @@ struct pci_epc *pci_epc_get(const char *epc_name) } EXPORT_SYMBOL_GPL(pci_epc_get); +/** + * pci_epc_get_first_free_bar() - helper to get first unreserved BAR + * @epc_features: pci_epc_features structure that holds the reserved bar bitmap + * + * Invoke to get the first unreserved BAR that can be used for endpoint + * function. + */ +int pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features) +{ + int free_bar; + + if (!epc_features) + return 0; + + free_bar = ffz(epc_features->reserved_bar); + if (free_bar <= 0 || free_bar > 6) + return -EINVAL; + + return free_bar; +} +EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar); + /** * pci_epc_get_features() - get the features supported by EPC * @epc: the features supported by *this* EPC device will be returned diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index 79fbcf94e14d..dc3513a2f88a 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -180,6 +180,7 @@ int pci_epc_start(struct pci_epc *epc); void pci_epc_stop(struct pci_epc *epc); const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc, u8 func_no); +int pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features); struct pci_epc *pci_epc_get(const char *epc_name); void pci_epc_put(struct pci_epc *epc); -- 2.17.1