From patchwork Mon Jun 13 13:02:02 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongdong Liu X-Patchwork-Id: 9172871 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 9E3D76075D for ; Mon, 13 Jun 2016 12:50:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 90B5021C9A for ; Mon, 13 Jun 2016 12:50:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8547427BC3; Mon, 13 Jun 2016 12:50:57 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable 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 D18AD21C9A for ; Mon, 13 Jun 2016 12:50:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422925AbcFMMun (ORCPT ); Mon, 13 Jun 2016 08:50:43 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:48048 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1422860AbcFMMuB (ORCPT ); Mon, 13 Jun 2016 08:50:01 -0400 Received: from 172.24.1.47 (EHLO szxeml427-hub.china.huawei.com) ([172.24.1.47]) by szxrg03-dlp.huawei.com (MOS 4.4.3-GA FastPath queued) with ESMTP id CDF31957; Mon, 13 Jun 2016 20:49:50 +0800 (CST) Received: from linux-ioko.site (10.71.200.31) by szxeml427-hub.china.huawei.com (10.82.67.182) with Microsoft SMTP Server id 14.3.235.1; Mon, 13 Jun 2016 20:49:42 +0800 From: Dongdong Liu To: , , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , Subject: [RFC PATCH V2 1/2] ACPI/PCI: Match PCI config space accessors against platfrom specific ECAM quirks Date: Mon, 13 Jun 2016 21:02:02 +0800 Message-ID: <1465822923-33599-2-git-send-email-liudongdong3@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1465822923-33599-1-git-send-email-liudongdong3@huawei.com> References: <1465822923-33599-1-git-send-email-liudongdong3@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.71.200.31] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090204.575EABF1.0013, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 4f51d40080e0e9f37c3cb40744c29953 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 From: Tomasz Nowicki 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, matches against tuple and returns corresponding PCI config ops. oem_id and oem_table_id come from MCFG table standard header. All quirks can be defined using DECLARE_ACPI_MCFG_FIXUP() macro and kept self contained. Example: /* Custom PCI config ops */ static struct pci_generic_ecam_ops foo_pci_ops = { .bus_shift = 24, .pci_ops = { .map_bus = pci_ecam_map_bus, .read = foo_ecam_config_read, .write = foo_ecam_config_write, } }; DECLARE_ACPI_MCFG_FIXUP(&foo_pci_ops, , , , ); Signed-off-by: Tomasz Nowicki Signed-off-by: Dongdong Liu --- drivers/acpi/pci_mcfg.c | 41 ++++++++++++++++++++++++++++++++++++--- include/asm-generic/vmlinux.lds.h | 7 +++++++ include/linux/pci-acpi.h | 20 +++++++++++++++++++ 3 files changed, 65 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c index d3c3e85..49612b3 100644 --- a/drivers/acpi/pci_mcfg.c +++ b/drivers/acpi/pci_mcfg.c @@ -22,6 +22,10 @@ #include #include #include +#include + +/* Root pointer to the mapped MCFG table */ +static struct acpi_table_mcfg *mcfg_table; /* Structure to hold entries from the MCFG table */ struct mcfg_entry { @@ -35,6 +39,38 @@ struct mcfg_entry { /* List to save mcfg entries */ static LIST_HEAD(pci_mcfg_list); +extern struct pci_cfg_fixup __start_acpi_mcfg_fixups[]; +extern struct pci_cfg_fixup __end_acpi_mcfg_fixups[]; + +struct pci_ecam_ops *pci_mcfg_get_ops(struct acpi_pci_root *root) +{ + int bus_num = root->secondary.start; + int domain = root->segment; + struct pci_cfg_fixup *f; + + if (!mcfg_table) + return &pci_generic_ecam_ops; + + /* + * Match against platform specific quirks and return corresponding + * CAM ops. + * + * First match against PCI topology then use OEM ID and + * OEM revision from MCFG table standard header. + */ + for (f = __start_acpi_mcfg_fixups; f < __end_acpi_mcfg_fixups; f++) { + if ((f->domain == domain || f->domain == PCI_MCFG_DOMAIN_ANY) && + (f->bus_num == bus_num || f->bus_num == PCI_MCFG_BUS_ANY) && + (!strncmp(f->oem_id, mcfg_table->header.oem_id, + ACPI_OEM_ID_SIZE)) && + (!strncmp(f->oem_table_id, mcfg_table->header.oem_table_id, + ACPI_OEM_TABLE_ID_SIZE))) + return f->ops; + } + /* No quirks, use ECAM */ + return &pci_generic_ecam_ops; +} + phys_addr_t pci_mcfg_lookup(u16 seg, struct resource *bus_res) { struct mcfg_entry *e; @@ -54,7 +90,6 @@ phys_addr_t pci_mcfg_lookup(u16 seg, struct resource *bus_res) static __init int pci_mcfg_parse(struct acpi_table_header *header) { - struct acpi_table_mcfg *mcfg; struct acpi_mcfg_allocation *mptr; struct mcfg_entry *e, *arr; int i, n; @@ -64,8 +99,8 @@ static __init int pci_mcfg_parse(struct acpi_table_header *header) n = (header->length - sizeof(struct acpi_table_mcfg)) / sizeof(struct acpi_mcfg_allocation); - mcfg = (struct acpi_table_mcfg *)header; - mptr = (struct acpi_mcfg_allocation *) &mcfg[1]; + mcfg_table = (struct acpi_table_mcfg *)header; + mptr = (struct acpi_mcfg_allocation *) &mcfg_table[1]; arr = kcalloc(n, sizeof(*arr), GFP_KERNEL); if (!arr) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 6a67ab9..43604fc 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -300,6 +300,13 @@ VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ } \ \ + /* ACPI MCFG quirks */ \ + .acpi_fixup : AT(ADDR(.acpi_fixup) - LOAD_OFFSET) { \ + VMLINUX_SYMBOL(__start_acpi_mcfg_fixups) = .; \ + *(.acpi_fixup_mcfg) \ + VMLINUX_SYMBOL(__end_acpi_mcfg_fixups) = .; \ + } \ + \ /* Built-in firmware blobs */ \ .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ VMLINUX_SYMBOL(__start_builtin_fw) = .; \ diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index 7d63a66..088a1da 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -25,6 +25,7 @@ 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_ecam_ops *pci_mcfg_get_ops(struct acpi_pci_root *root); static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev) { @@ -72,6 +73,25 @@ struct acpi_pci_root_ops { int (*prepare_resources)(struct acpi_pci_root_info *info); }; +struct pci_cfg_fixup { + struct pci_ecam_ops *ops; + char *oem_id; + char *oem_table_id; + int domain; + int bus_num; +}; + +#define PCI_MCFG_DOMAIN_ANY -1 +#define PCI_MCFG_BUS_ANY -1 + +/* Designate a routine to fix up buggy MCFG */ +#define DECLARE_ACPI_MCFG_FIXUP(ops, oem_id, oem_table_id, dom, bus) \ + static const struct pci_cfg_fixup \ + __mcfg_fixup_##oem_id##oem_table_id##dom##bus \ + __used __attribute__((__section__(".acpi_fixup_mcfg"), \ + aligned((sizeof(void *))))) = \ + { ops, oem_id, oem_table_id, dom, bus }; + extern int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info); extern struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, struct acpi_pci_root_ops *ops,