From patchwork Mon Jan 7 06:41:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kishon Vijay Abraham I X-Patchwork-Id: 10749995 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8B46F14E2 for ; Mon, 7 Jan 2019 06:44:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7CAF428560 for ; Mon, 7 Jan 2019 06:44:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 714692888A; Mon, 7 Jan 2019 06:44:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1E82D28560 for ; Mon, 7 Jan 2019 06:44:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726485AbfAGGor (ORCPT ); Mon, 7 Jan 2019 01:44:47 -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 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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);