From patchwork Mon Dec 19 14:46:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 13076696 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 EA694C46467 for ; Mon, 19 Dec 2022 14:48:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232064AbiLSOsl (ORCPT ); Mon, 19 Dec 2022 09:48:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45866 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232060AbiLSOr2 (ORCPT ); Mon, 19 Dec 2022 09:47:28 -0500 Received: from post.baikalelectronics.com (post.baikalelectronics.com [213.79.110.86]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 1963CD6C; Mon, 19 Dec 2022 06:47:19 -0800 (PST) Received: from post.baikalelectronics.com (localhost.localdomain [127.0.0.1]) by post.baikalelectronics.com (Proxmox) with ESMTP id AFDB7E0EAE; Mon, 19 Dec 2022 17:47:18 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= baikalelectronics.ru; h=cc:cc:content-transfer-encoding :content-type:content-type:date:from:from:in-reply-to:message-id :mime-version:references:reply-to:subject:subject:to:to; s=post; bh=IVGPP2jZ09sUiEmbIAMST4sy74yx2ZoZzppBbwb2xUU=; b=rbivK3HYN5L2 udC76Yv+lYsKW57m9H/tRTwSsGDCXv8fSzgpocZIFGhsDDMuYasWQ9g5idU90kxg 4djfJEMvY/X2duKqR7OrwzaeRjyDEJ8Ercn00bKDAaZqvhS+E94N933hbhlq5Ufv DFV9oanWYl+BaOpxR3cemMUsGCNNA7Q= Received: from mail.baikal.int (mail.baikal.int [192.168.51.25]) by post.baikalelectronics.com (Proxmox) with ESMTP id 9B97CE0E70; Mon, 19 Dec 2022 17:47:18 +0300 (MSK) Received: from localhost (10.8.30.14) by mail (192.168.51.25) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 19 Dec 2022 17:47:18 +0300 From: Serge Semin To: Gustavo Pimentel , Vinod Koul , Rob Herring , Bjorn Helgaas , Lorenzo Pieralisi , Cai Huoqing , Robin Murphy , Jingoo Han , Frank Li , Manivannan Sadhasivam CC: Serge Semin , Serge Semin , Alexey Malahov , Pavel Parkhomenko , =?utf-8?q?Krzys?= =?utf-8?q?ztof_Wilczy=C5=84ski?= , caihuoqing , Yoshihiro Shimoda , , , Subject: [PATCH v8 23/26] dmaengine: dw-edma: Relax driver config settings Date: Mon, 19 Dec 2022 17:46:54 +0300 Message-ID: <20221219144658.26620-24-Sergey.Semin@baikalelectronics.ru> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221219144658.26620-1-Sergey.Semin@baikalelectronics.ru> References: <20221219144658.26620-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-Originating-IP: [10.8.30.14] X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Since the DW PCIe RP/EP driver is about to be updated to register the DW eDMA-based DMA-engine the drivers build modes must be synchronized. Currently the DW PCIe RP/EP driver is always built as a builtin module. Meanwhile the DW eDMA driver can be built as a loadable module. Thus in the later case the kernel with DW PCIe controllers support will fail to be linked due to lacking the DW eDMA probe/remove symbols. At the same time forcibly selecting the DW eDMA driver from the DW PCIe RP/EP kconfig will effectively eliminate the tristate type of the former driver fixing it to just the builtin kernel module. Seeing the DW eDMA engine isn't that often met built into the DW PCIe Root-ports and End-points let's convert the DW eDMA driver config to being more flexible instead of just forcibly selecting the DW eDMA kconfig. In order to do that first the DW eDMA PCIe driver config should be converted to being depended from the DW eDMA core config instead of selecting the one. Second the DW eDMA probe and remove symbols should be referenced only if they are reachable by the caller. Thus the user will be able to build the DW eDMA core driver with any type, meanwhile the dependent code will be either restricted to the same build type (e.g. DW eDMA PCIe driver if DW eDMA driver is built as a loadable module) or just won't be able to use the eDMA engine registration/de-registration functionality (e.g. DW PCIe RP/EP driver if DW eDMA driver is built as a loadable module). Signed-off-by: Serge Semin --- Changelog v8: - This is a new patch added on v8 stage of the series in order to fix the tbot-reported build issues. (@tbot) --- drivers/dma/dw-edma/Kconfig | 5 ++++- include/linux/dma/edma.h | 2 +- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/dma/dw-edma/Kconfig b/drivers/dma/dw-edma/Kconfig index 7ff17b2db6a1..2b6f2679508d 100644 --- a/drivers/dma/dw-edma/Kconfig +++ b/drivers/dma/dw-edma/Kconfig @@ -9,11 +9,14 @@ config DW_EDMA Support the Synopsys DesignWare eDMA controller, normally implemented on endpoints SoCs. +if DW_EDMA + config DW_EDMA_PCIE tristate "Synopsys DesignWare eDMA PCIe driver" depends on PCI && PCI_MSI - select DW_EDMA help Provides a glue-logic between the Synopsys DesignWare eDMA controller and an endpoint PCIe device. This also serves as a reference design to whom desires to use this IP. + +endif # DW_EDMA diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h index 9d44da4aa59d..0cdd39d68527 100644 --- a/include/linux/dma/edma.h +++ b/include/linux/dma/edma.h @@ -98,7 +98,7 @@ struct dw_edma_chip { }; /* Export to the platform drivers */ -#if IS_ENABLED(CONFIG_DW_EDMA) +#if IS_REACHABLE(CONFIG_DW_EDMA) int dw_edma_probe(struct dw_edma_chip *chip); int dw_edma_remove(struct dw_edma_chip *chip); #else