2 * pci_slot.c - ACPI PCI Slot Driver
4 * The code here is heavily leveraged from the acpiphp module.
5 * Thanks to Matthew Wilcox <matthew@wil.cx> for much guidance.
6 * Thanks to Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> for code
9 * Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
10 * Alex Chiang <achiang@hp.com>
12 * Copyright (C) 2013 Huawei Tech. Co., Ltd.
13 * Jiang Liu <jiang.liu@huawei.com>
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms and conditions of the GNU General Public License,
17 * version 2, as published by the Free Software Foundation.
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * General Public License for more details.
25 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/types.h>
32 #include <linux/list.h>
33 #include <linux/pci.h>
34 #include <linux/acpi.h>
35 #include <linux/dmi.h>
36 #include <linux/pci-acpi.h>
39 static int check_sta_before_sun;
41 #define DRIVER_VERSION "0.1"
42 #define DRIVER_AUTHOR "Alex Chiang <achiang@hp.com>"
43 #define DRIVER_DESC "ACPI PCI Slot Detection Driver"
44 MODULE_AUTHOR(DRIVER_AUTHOR);
45 MODULE_DESCRIPTION(DRIVER_DESC);
46 MODULE_LICENSE("GPL");
47 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
48 module_param(debug, bool, 0644);
50 #define _COMPONENT ACPI_PCI_COMPONENT
51 ACPI_MODULE_NAME("pci_slot");
53 #define dbg(fmt, ...) \
56 pr_debug(fmt, ##__VA_ARGS__); \
59 #define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
61 struct acpi_pci_slot {
62 struct pci_slot *pci_slot; /* corresponding pci_slot */
63 struct list_head list; /* node in the list of slots */
66 static LIST_HEAD(slot_list);
67 static DEFINE_MUTEX(slot_list_lock);
70 check_slot(acpi_handle handle, unsigned long long *sun)
73 unsigned long long adr, sta;
75 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
77 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
78 dbg("Checking slot on path: %s\n", (char *)buffer.pointer);
80 if (check_sta_before_sun) {
81 /* If SxFy doesn't have _STA, we just assume it's there */
82 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
83 if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
87 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
88 if (ACPI_FAILURE(status)) {
89 dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer);
93 /* No _SUN == not a slot == bail */
94 status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
95 if (ACPI_FAILURE(status)) {
96 dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer);
100 device = (adr >> 16) & 0xffff;
102 kfree(buffer.pointer);
107 * Check whether handle has an associated slot and create PCI slot if it has.
110 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
113 unsigned long long sun;
114 char name[SLOT_NAME_SIZE];
115 struct acpi_pci_slot *slot;
116 struct pci_slot *pci_slot;
117 struct pci_bus *pci_bus = context;
119 device = check_slot(handle, &sun);
124 * There may be multiple PCI functions associated with the same slot.
125 * Check whether PCI slot has already been created for this PCI device.
127 list_for_each_entry(slot, &slot_list, list) {
128 pci_slot = slot->pci_slot;
129 if (pci_slot->bus == pci_bus && pci_slot->number == device)
133 slot = kmalloc(sizeof(*slot), GFP_KERNEL);
137 snprintf(name, sizeof(name), "%llu", sun);
138 pci_slot = pci_create_slot(pci_bus, device, name, NULL);
139 if (IS_ERR(pci_slot)) {
140 pr_err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
145 slot->pci_slot = pci_slot;
146 list_add(&slot->list, &slot_list);
148 get_device(&pci_bus->dev);
150 dbg("%p, pci_bus: %x, device: %d, name: %s\n",
151 pci_slot, pci_bus->number, device, name);
156 void acpi_pci_slot_enumerate(struct pci_bus *bus)
158 acpi_handle handle = ACPI_HANDLE(bus->bridge);
161 mutex_lock(&slot_list_lock);
162 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
163 register_slot, NULL, bus, NULL);
164 mutex_unlock(&slot_list_lock);
168 void acpi_pci_slot_remove(struct pci_bus *bus)
170 struct acpi_pci_slot *slot, *tmp;
172 mutex_lock(&slot_list_lock);
173 list_for_each_entry_safe(slot, tmp, &slot_list, list) {
174 if (slot->pci_slot->bus == bus) {
175 list_del(&slot->list);
176 pci_destroy_slot(slot->pci_slot);
177 put_device(&bus->dev);
181 mutex_unlock(&slot_list_lock);
184 static int do_sta_before_sun(const struct dmi_system_id *d)
186 pr_info("%s detected: will evaluate _STA before calling _SUN\n",
188 check_sta_before_sun = 1;
192 static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
194 * Fujitsu Primequest machines will return 1023 to indicate an
195 * error if the _SUN method is evaluated on SxFy objects that
196 * are not present (as indicated by _STA), so for those machines,
197 * we want to check _STA before evaluating _SUN.
200 .callback = do_sta_before_sun,
201 .ident = "Fujitsu PRIMEQUEST",
203 DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"),
204 DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"),
210 void __init acpi_pci_slot_init(void)
212 dmi_check_system(acpi_pci_slot_dmi_table);