From patchwork Mon Aug 8 13:05:39 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Nowicki X-Patchwork-Id: 9268303 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.web.codeaurora.org (Postfix) with ESMTP id 83B9F607D6 for ; Mon, 8 Aug 2016 13:06:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 768E927E66 for ; Mon, 8 Aug 2016 13:06:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6A68F283E4; Mon, 8 Aug 2016 13:06:11 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID 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 87E4D283EC for ; Mon, 8 Aug 2016 13:06:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932165AbcHHNGH (ORCPT ); Mon, 8 Aug 2016 09:06:07 -0400 Received: from mail-wm0-f43.google.com ([74.125.82.43]:38195 "EHLO mail-wm0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752425AbcHHNGC (ORCPT ); Mon, 8 Aug 2016 09:06:02 -0400 Received: by mail-wm0-f43.google.com with SMTP id o80so137876674wme.1 for ; Mon, 08 Aug 2016 06:06:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=semihalf-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=2c4AQLKIdhxMC+YkTcDTl3btcgSQcl0evHLiOJ3VlwE=; b=RpAJXifN4ntVAXXlylnnP1Nf8zVh37JhbFrJy+jC2a4f2y5zijylCRv//5zPCfRgWV FjVKEGYQ481tzNqjCcm3Zn1dztkmGH2E8tkVhDts6jrQfNuOaen51xf0w9HcU8wqNa7O H26b3gaU9E9jVEYD/d40yFQWBLCsBCjgCwpEhpjQLB+joUwya7x7HgCeEc9xORXPia8s TkHU5d+bIpwLeJRJp4u4xr6hNEPDCC6nlrCFYwPSRRumnRnwmnyVpzdM39i+z4K6EcPU OmNW4xgkCzeJFbuDz6OlytW13hSpg3VCdSbLB/gXZU6x9bhJxelpfX473TQTmxN6x5Kn /DyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=2c4AQLKIdhxMC+YkTcDTl3btcgSQcl0evHLiOJ3VlwE=; b=MSGu8bCOQRpKdPGY0t2wlJDEJFeOp9oW/JVjg7AeF3f/HCC/pxSYWoy5cvVAi02DmR eBfuWtIqZJiVPsiDug++SVP7KSLQMcnoxjTCRpoNXIJ0KTwV/r8GZtFmRUMRFATdxqkZ xG/6q6xTc2fk6ScocC7o1tE8+Hm2SSDNPJ6C1wyP4IopaNlVS/PGBdk5azR6UPzTh3vP eVQfDvBdvmdMrlumIQL6qbSn80pKSzL9rMhQSRG1Tk3rUONcYaPdJPaDKltqIgMta0cE RNgi3zwB5qwaSjHEJQXjJ1uqtabcGiDND1JjKqWCOGEMiIJcg+JhrS6uaYCfPmvBkh5Y DUXw== X-Gm-Message-State: AEkoousgfBeSmLryNhJdsDV2uSsrteJlOetddRxQgW3n+NTjj1LuMJPMM6MH1vtJktHCbg== X-Received: by 10.25.89.2 with SMTP id n2mr11525042lfb.208.1470661560826; Mon, 08 Aug 2016 06:06:00 -0700 (PDT) Received: from tn-HP-4.semihalf.local (31-172-191-173.noc.fibertech.net.pl. [31.172.191.173]) by smtp.gmail.com with ESMTPSA id g11sm5644098lji.25.2016.08.08.06.05.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 08 Aug 2016 06:05:59 -0700 (PDT) From: Tomasz Nowicki To: helgaas@kernel.org, arnd@arndb.de, will.deacon@arm.com, catalin.marinas@arm.com, rafael@kernel.org, Lorenzo.Pieralisi@arm.com Cc: hanjun.guo@linaro.org, okaya@codeaurora.org, jchandra@broadcom.com, cov@codeaurora.org, dhdang@apm.com, ard.biesheuvel@linaro.org, robert.richter@caviumnetworks.com, mw@semihalf.com, Liviu.Dudau@arm.com, ddaney@caviumnetworks.com, wangyijing@huawei.com, msalter@redhat.com, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linaro-acpi@lists.linaro.org, jcm@redhat.com, andrea.gallo@linaro.org, jeremy.linton@arm.com, liudongdong3@huawei.com, gabriele.paoloni@huawei.com, jhugo@codeaurora.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Tomasz Nowicki Subject: [RFC PATCH V5 3/5] PCI: Check platform specific ECAM quirks Date: Mon, 8 Aug 2016 15:05:39 +0200 Message-Id: <1470661541-26270-4-git-send-email-tn@semihalf.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1470661541-26270-1-git-send-email-tn@semihalf.com> References: <1470661541-26270-1-git-send-email-tn@semihalf.com> 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 Some platforms may not be fully compliant with generic set of PCI config accessors. For these cases we implement the way to overwrite accessors set. Algorithm traverses available quirk list (static array), matches against and returns pci_config_window structure with fancy PCI config ops. oem_id, oem_table_id and rev come from MCFG table standard header. It is possible to define custom init call which is responsible for setting up PCI configuration access accordingly to quirk requirements. If custom init call is not defined, use standard pci_acpi_setup_ecam_mapping(). pci_generic_ecam_ops will be used for platforms free from quirks. Signed-off-by: Tomasz Nowicki Signed-off-by: Dongdong Liu Signed-off-by: Christopher Covington --- drivers/pci/host/Makefile | 1 + drivers/pci/host/mcfg-quirks.c | 86 ++++++++++++++++++++++++++++++++++++++++++ drivers/pci/host/mcfg-quirks.h | 20 ++++++++++ include/linux/pci-acpi.h | 2 + 4 files changed, 109 insertions(+) create mode 100644 drivers/pci/host/mcfg-quirks.c create mode 100644 drivers/pci/host/mcfg-quirks.h diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile index 8843410..500cf78 100644 --- a/drivers/pci/host/Makefile +++ b/drivers/pci/host/Makefile @@ -31,3 +31,4 @@ obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o +obj-$(CONFIG_ACPI_MCFG) += mcfg-quirks.o diff --git a/drivers/pci/host/mcfg-quirks.c b/drivers/pci/host/mcfg-quirks.c new file mode 100644 index 0000000..aa9907b --- /dev/null +++ b/drivers/pci/host/mcfg-quirks.c @@ -0,0 +1,86 @@ +/* + * Copyright (C) 2016 Semihalf + * Author: Tomasz Nowicki + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation (the "GPL"). + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 (GPLv2) for more details. + * + * You should have received a copy of the GNU General Public License + * version 2 (GPLv2) along with this source code. + */ + +#include +#include +#include +#include +#include + +#include "mcfg-quirks.h" + +struct pci_cfg_fixup { + char oem_id[ACPI_OEM_ID_SIZE + 1]; + char oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1]; + u32 oem_revision; + struct resource domain_range; + struct resource bus_range; + struct pci_ops *ops; + struct pci_config_window *(*init)(struct acpi_pci_root *root, + struct pci_ops *ops); +}; + +#define MCFG_DOM_RANGE(start, end) DEFINE_RES_NAMED((start), \ + ((end) - (start) + 1), NULL, 0) +#define MCFG_DOM_ANY MCFG_DOM_RANGE(0x0, 0xffff) +#define MCFG_BUS_RANGE(start, end) DEFINE_RES_NAMED((start), \ + ((end) - (start) + 1), \ + NULL, IORESOURCE_BUS) +#define MCFG_BUS_ANY MCFG_BUS_RANGE(0x0, 0xff) + +static struct pci_cfg_fixup mcfg_quirks[] __initconst = { +/* { OEM_ID, OEM_TABLE_ID, REV, DOMAIN, BUS_RANGE, pci_ops, init_hook }, */ +}; + +static bool pci_mcfg_fixup_match(struct pci_cfg_fixup *f, + struct acpi_table_header *mcfg_header) +{ + return (!memcmp(f->oem_id, mcfg_header->oem_id, ACPI_OEM_ID_SIZE) && + !memcmp(f->oem_table_id, mcfg_header->oem_table_id, + ACPI_OEM_TABLE_ID_SIZE) && + f->oem_revision == mcfg_header->oem_revision); +} + +struct pci_config_window *pci_mcfg_match_quirks(struct acpi_pci_root *root) +{ + struct resource dom_res = MCFG_DOM_RANGE(root->segment, root->segment); + struct resource *bus_res = &root->secondary; + struct pci_cfg_fixup *f = mcfg_quirks; + struct acpi_table_header *mcfg_header; + acpi_status status; + int i; + + status = acpi_get_table(ACPI_SIG_MCFG, 0, &mcfg_header); + if (ACPI_FAILURE(status)) + return NULL; + + /* + * First match against PCI topology then use OEM ID, OEM + * table ID, and OEM revision from MCFG table standard header. + */ + for (i = 0; i < ARRAY_SIZE(mcfg_quirks); i++, f++) { + if (resource_contains(&f->domain_range, &dom_res) && + resource_contains(&f->bus_range, bus_res) && + pci_mcfg_fixup_match(f, mcfg_header)) { + dev_info(&root->device->dev, "Applying PCI MCFG quirks for %s %s rev: %d\n", + f->oem_id, f->oem_table_id, f->oem_revision); + return f->init ? f->init(root, f->ops) : + pci_acpi_setup_ecam_mapping(root, f->ops); + } + } + return pci_acpi_setup_ecam_mapping(root, &pci_generic_ecam_ops.pci_ops); +} diff --git a/drivers/pci/host/mcfg-quirks.h b/drivers/pci/host/mcfg-quirks.h new file mode 100644 index 0000000..45cbd16 --- /dev/null +++ b/drivers/pci/host/mcfg-quirks.h @@ -0,0 +1,20 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation (the "GPL"). + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 (GPLv2) for more details. + * + * You should have received a copy of the GNU General Public License + * version 2 (GPLv2) along with this source code. + */ + +#ifndef __MCFG_QUIRKS_H__ +#define __MCFG_QUIRKS_H__ + +/* MCFG quirks initialize call list */ + +#endif /* __MCFG_QUIRKS_H__ */ diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index e9bfe00..28cdce4 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -25,6 +25,8 @@ static inline acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) extern phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle); extern phys_addr_t pci_mcfg_lookup(u16 domain, struct resource *bus_res); +extern struct pci_config_window * +pci_mcfg_match_quirks(struct acpi_pci_root *root); extern struct pci_config_window * pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root, struct pci_ops *ops);