From patchwork Thu Mar 24 01:25:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 1610243 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=baikalelectronics.ru header.i=@baikalelectronics.ru header.a=rsa-sha256 header.s=mail header.b=Kj3XWlAj; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4KRx1Y4KMWz9sCq for ; Tue, 29 Mar 2022 02:09:21 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244303AbiC1PK6 (ORCPT ); Mon, 28 Mar 2022 11:10:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54416 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244282AbiC1PKw (ORCPT ); Mon, 28 Mar 2022 11:10:52 -0400 Received: from mail.baikalelectronics.ru (mail.baikalelectronics.com [87.245.175.226]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id A12AB5D678; Mon, 28 Mar 2022 08:09:11 -0700 (PDT) Received: from mail.baikalelectronics.ru (unknown [192.168.51.25]) by mail.baikalelectronics.ru (Postfix) with ESMTP id CBA6F1D5AA4; Thu, 24 Mar 2022 04:25:28 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.baikalelectronics.ru CBA6F1D5AA4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baikalelectronics.ru; s=mail; t=1648085128; bh=IbIaYTvWDrKAUBeB4maQw5G0xL0EbHFE7cErJ4OZffw=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=Kj3XWlAjDtwI1H7wfY5SLU0FfgYrkPz2fK/hU9LL6CDMyD9Qhis900nu//yxc4rxm WfSLS7bJ3moqeA9mMcMGw7gJo2X6rul0kW5tO5vq91/ENFjW7RWyqEQTf80x5rWHiJ 1J3y8e/7dIi65F0viTmyB71tC/qHck0CagV/Odxk= Received: from localhost (192.168.168.10) by mail (192.168.51.25) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 24 Mar 2022 04:25:28 +0300 From: Serge Semin To: Jingoo Han , Gustavo Pimentel , Bjorn Helgaas , Lorenzo Pieralisi , Rob Herring , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= CC: Serge Semin , Serge Semin , Alexey Malahov , Pavel Parkhomenko , Frank Li , Manivannan Sadhasivam , , Subject: [PATCH 02/12] PCI: dwc: Don't use generic IO-ops for DBI-space access Date: Thu, 24 Mar 2022 04:25:13 +0300 Message-ID: <20220324012524.16784-3-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20220324012524.16784-1-Sergey.Semin@baikalelectronics.ru> References: <20220324012524.16784-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Commit c2b0c098fbd1 ("PCI: dwc: Use generic config accessors") replaced the locally defined DW PCIe host controller config-space accessors with the generic methods pci_generic_config_read() and pci_generic_config_write(). It was intended that the corresponding bus-mapping callback returned a correct virtual address of the passed PCI config-space register. The problem of the proposed solution was that it didn't take into account the way the host config-space is accessed on the DW PCIe. Depending on the DW PCIe IP-core synthesize parameters different interfaces can be used to access the host and peripheral config/memory spaces. The former one can be accessed via the DBI interface, while the later ones is reached via the AHB/AXI application bus. In case if the DW PCIe controller is configured to have a dedicated DBI interface, the way it is mapped into the IO-memory turns to be platform-specific. For such setups the DWC PCIe driver provides a set of the callbacks dw_pcie_ops.{read_dbi,write_dbi} so the platforms glue-drivers would be able to take into account the DBI bus IO peculiarities. Since commit c2b0c098fbd1 ("PCI: dwc: Use generic config accessors") these methods haven't been utilized during the generic host initialization performed by the PCIe subsystem code. I don't really know how come there have been no problems spotted for the Histb/Exynos/Kirin PCIe controllers so far, but in our case with dword aligned IO requirement the generic config-space accessors can't be utilized for the host config-space. Thus in order to make sure the host config-space is properly accessed via the DBI bus let's get back the dw_pcie_rd_own_conf() and dw_pcie_wr_own_conf() methods. They are going to be just wrappers around the already defined dw_pcie_read_dbi()/dw_pcie_write_dbi() functions with proper arguments conversion. These methods perform the platform-specific config-space IO if the DBI accessors are specified, otherwise they call normal MMIO operations. Fixes: c2b0c098fbd1 ("PCI: dwc: Use generic config accessors") Signed-off-by: Serge Semin --- .../pci/controller/dwc/pcie-designware-host.c | 34 +++++++++++++++++-- 1 file changed, 32 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index a03619a30c20..f89e6552139b 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -528,10 +528,40 @@ void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, } EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus); +static int dw_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 *val) +{ + struct pcie_port *pp = bus->sysdata; + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + + if (PCI_SLOT(devfn) > 0) { + *val = ~0U; + return PCIBIOS_DEVICE_NOT_FOUND; + } + + *val = dw_pcie_read_dbi(pci, where, size); + + return PCIBIOS_SUCCESSFUL; +} + +static int dw_pcie_wr_own_conf(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) +{ + struct pcie_port *pp = bus->sysdata; + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + + if (PCI_SLOT(devfn) > 0) + return PCIBIOS_DEVICE_NOT_FOUND; + + dw_pcie_write_dbi(pci, where, size, val); + + return PCIBIOS_SUCCESSFUL; +} + static struct pci_ops dw_pcie_ops = { .map_bus = dw_pcie_own_conf_map_bus, - .read = pci_generic_config_read, - .write = pci_generic_config_write, + .read = dw_pcie_rd_own_conf, + .write = dw_pcie_wr_own_conf, }; void dw_pcie_setup_rc(struct pcie_port *pp)