/* * pci_slot.c - ACPI PCI Slot Driver * * The code here is heavily leveraged from the acpiphp module. * Thanks to Matthew Wilcox <matthew@wil.cx> for much guidance. * Thanks to Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> for code * review and fixes. * * Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P. * Alex Chiang <achiang@hp.com> * * Copyright (C) 2013 Huawei Tech. Co., Ltd. * Jiang Liu <jiang.liu@huawei.com> * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * 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 for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/list.h> #include <linux/pci.h> #include <linux/acpi.h> #include <linux/dmi.h> #include <linux/pci-acpi.h> static bool debug; static int check_sta_before_sun; #define DRIVER_VERSION "0.1" #define DRIVER_AUTHOR "Alex Chiang <achiang@hp.com>" #define DRIVER_DESC "ACPI PCI Slot Detection Driver" MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); module_param(debug, bool, 0644); #define _COMPONENT ACPI_PCI_COMPONENT ACPI_MODULE_NAME("pci_slot"); #define MY_NAME "pci_slot" #define err(format, arg...) pr_err("%s: " format , MY_NAME , ## arg) #define info(format, arg...) pr_info("%s: " format , MY_NAME , ## arg) #define dbg(format, arg...) \ do { \ if (debug) \ pr_debug("%s: " format, MY_NAME , ## arg); \ } while (0) #define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */ struct acpi_pci_slot { struct pci_slot *pci_slot; /* corresponding pci_slot */ struct list_head list; /* node in the list of slots */ }; static LIST_HEAD(slot_list); static DEFINE_MUTEX(slot_list_lock); static int check_slot(acpi_handle handle, unsigned long long *sun) { int device = -1; unsigned long long adr, sta; acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); dbg("Checking slot on path: %s\n", (char *)buffer.pointer); if (check_sta_before_sun) { /* If SxFy doesn't have _STA, we just assume it's there */ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT)) goto out; } status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); if (ACPI_FAILURE(status)) { dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer); goto out; } /* No _SUN == not a slot == bail */ status = acpi_evaluate_integer(handle, "_SUN", NULL, sun); if (ACPI_FAILURE(status)) { dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer); goto out; } device = (adr >> 16) & 0xffff; out: kfree(buffer.pointer); return device; } /* * Check whether handle has an associated slot and create PCI slot if it has. */ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) { int device; unsigned long long sun; char name[SLOT_NAME_SIZE]; struct acpi_pci_slot *slot; struct pci_slot *pci_slot; struct pci_bus *pci_bus = context; device = check_slot(handle, &sun); if (device < 0) return AE_OK; /* * There may be multiple PCI functions associated with the same slot. * Check whether PCI slot has already been created for this PCI device. */ list_for_each_entry(slot, &slot_list, list) { pci_slot = slot->pci_slot; if (pci_slot->bus == pci_bus && pci_slot->number == device) return AE_OK; } slot = kmalloc(sizeof(*slot), GFP_KERNEL); if (!slot) { err("%s: cannot allocate memory\n", __func__); return AE_OK; } snprintf(name, sizeof(name), "%llu", sun); pci_slot = pci_create_slot(pci_bus, device, name, NULL); if (IS_ERR(pci_slot)) { err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot)); kfree(slot); return AE_OK; } slot->pci_slot = pci_slot; list_add(&slot->list, &slot_list); get_device(&pci_bus->dev); dbg("pci_slot: %p, pci_bus: %x, device: %d, name: %s\n", pci_slot, pci_bus->number, device, name); return AE_OK; } void acpi_pci_slot_enumerate(struct pci_bus *bus) { acpi_handle handle = ACPI_HANDLE(bus->bridge); if (handle) { mutex_lock(&slot_list_lock); acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, register_slot, NULL, bus, NULL); mutex_unlock(&slot_list_lock); } } void acpi_pci_slot_remove(struct pci_bus *bus) { struct acpi_pci_slot *slot, *tmp; mutex_lock(&slot_list_lock); list_for_each_entry_safe(slot, tmp, &slot_list, list) { if (slot->pci_slot->bus == bus) { list_del(&slot->list); pci_destroy_slot(slot->pci_slot); put_device(&bus->dev); kfree(slot); } } mutex_unlock(&slot_list_lock); } static int do_sta_before_sun(const struct dmi_system_id *d) { info("%s detected: will evaluate _STA before calling _SUN\n", d->ident); check_sta_before_sun = 1; return 0; } static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = { /* * Fujitsu Primequest machines will return 1023 to indicate an * error if the _SUN method is evaluated on SxFy objects that * are not present (as indicated by _STA), so for those machines, * we want to check _STA before evaluating _SUN. */ { .callback = do_sta_before_sun, .ident = "Fujitsu PRIMEQUEST", .matches = { DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"), DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"), }, }, {} }; void __init acpi_pci_slot_init(void) { dmi_check_system(acpi_pci_slot_dmi_table); }