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Alex Chiang8344b562008-06-10 15:30:42 -06001/*
2 * pci_slot.c - ACPI PCI Slot Driver
3 *
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
7 * review and fixes.
8 *
Alex Chiange4268aa2008-07-17 11:13:32 -06009 * Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
10 * Alex Chiang <achiang@hp.com>
Alex Chiang8344b562008-06-10 15:30:42 -060011 *
Jiang Liu5c0b04e2013-04-12 05:44:24 +000012 * Copyright (C) 2013 Huawei Tech. Co., Ltd.
13 * Jiang Liu <jiang.liu@huawei.com>
14 *
Alex Chiang8344b562008-06-10 15:30:42 -060015 * 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.
18 *
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.
Alex Chiang8344b562008-06-10 15:30:42 -060023 */
24
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Alex Chiang8344b562008-06-10 15:30:42 -060029#include <linux/types.h>
Jiang Liu5c0b04e2013-04-12 05:44:24 +000030#include <linux/list.h>
Alex Chiang8344b562008-06-10 15:30:42 -060031#include <linux/pci.h>
32#include <linux/acpi.h>
Len Browneb27cae2009-07-06 23:40:19 -040033#include <linux/dmi.h>
Rashikae22e58a2013-12-17 14:48:19 +053034#include <linux/pci-acpi.h>
Alex Chiang8344b562008-06-10 15:30:42 -060035
Rusty Russell90ab5ee2012-01-13 09:32:20 +103036static bool debug;
Alex Chiang8344b562008-06-10 15:30:42 -060037static int check_sta_before_sun;
38
39#define DRIVER_VERSION "0.1"
40#define DRIVER_AUTHOR "Alex Chiang <achiang@hp.com>"
41#define DRIVER_DESC "ACPI PCI Slot Detection Driver"
42MODULE_AUTHOR(DRIVER_AUTHOR);
43MODULE_DESCRIPTION(DRIVER_DESC);
44MODULE_LICENSE("GPL");
45MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
46module_param(debug, bool, 0644);
47
48#define _COMPONENT ACPI_PCI_COMPONENT
49ACPI_MODULE_NAME("pci_slot");
50
51#define MY_NAME "pci_slot"
Jiang Liu73ce8732013-02-03 14:55:45 +010052#define err(format, arg...) pr_err("%s: " format , MY_NAME , ## arg)
53#define info(format, arg...) pr_info("%s: " format , MY_NAME , ## arg)
Alex Chiang8344b562008-06-10 15:30:42 -060054#define dbg(format, arg...) \
55 do { \
56 if (debug) \
Jiang Liu73ce8732013-02-03 14:55:45 +010057 pr_debug("%s: " format, MY_NAME , ## arg); \
Alex Chiang8344b562008-06-10 15:30:42 -060058 } while (0)
59
Alex Chiang7e24bc12009-08-04 14:44:17 -060060#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
Alex Chiang8344b562008-06-10 15:30:42 -060061
62struct acpi_pci_slot {
Alex Chiang8344b562008-06-10 15:30:42 -060063 struct pci_slot *pci_slot; /* corresponding pci_slot */
64 struct list_head list; /* node in the list of slots */
65};
66
Alex Chiang8344b562008-06-10 15:30:42 -060067static LIST_HEAD(slot_list);
68static DEFINE_MUTEX(slot_list_lock);
Alex Chiang8344b562008-06-10 15:30:42 -060069
70static int
Matthew Wilcox27663c52008-10-10 02:22:59 -040071check_slot(acpi_handle handle, unsigned long long *sun)
Alex Chiang8344b562008-06-10 15:30:42 -060072{
Matthew Wilcox362b7072008-07-22 12:37:17 -060073 int device = -1;
Matthew Wilcox27663c52008-10-10 02:22:59 -040074 unsigned long long adr, sta;
Alex Chiang8344b562008-06-10 15:30:42 -060075 acpi_status status;
76 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
77
78 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
79 dbg("Checking slot on path: %s\n", (char *)buffer.pointer);
80
81 if (check_sta_before_sun) {
82 /* If SxFy doesn't have _STA, we just assume it's there */
83 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Matthew Wilcox362b7072008-07-22 12:37:17 -060084 if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
Alex Chiang8344b562008-06-10 15:30:42 -060085 goto out;
Alex Chiang8344b562008-06-10 15:30:42 -060086 }
87
88 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
89 if (ACPI_FAILURE(status)) {
90 dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer);
Alex Chiang8344b562008-06-10 15:30:42 -060091 goto out;
92 }
93
Alex Chiang8344b562008-06-10 15:30:42 -060094 /* No _SUN == not a slot == bail */
95 status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
96 if (ACPI_FAILURE(status)) {
97 dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer);
Alex Chiang8344b562008-06-10 15:30:42 -060098 goto out;
99 }
100
Matthew Wilcox362b7072008-07-22 12:37:17 -0600101 device = (adr >> 16) & 0xffff;
Alex Chiang8344b562008-06-10 15:30:42 -0600102out:
103 kfree(buffer.pointer);
Matthew Wilcox362b7072008-07-22 12:37:17 -0600104 return device;
Alex Chiang8344b562008-06-10 15:30:42 -0600105}
106
Alex Chiang8344b562008-06-10 15:30:42 -0600107/*
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000108 * Check whether handle has an associated slot and create PCI slot if it has.
Alex Chiang8344b562008-06-10 15:30:42 -0600109 */
110static acpi_status
111register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
112{
113 int device;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400114 unsigned long long sun;
Alex Chiang8344b562008-06-10 15:30:42 -0600115 char name[SLOT_NAME_SIZE];
116 struct acpi_pci_slot *slot;
117 struct pci_slot *pci_slot;
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000118 struct pci_bus *pci_bus = context;
Alex Chiang8344b562008-06-10 15:30:42 -0600119
Matthew Wilcox362b7072008-07-22 12:37:17 -0600120 device = check_slot(handle, &sun);
121 if (device < 0)
Alex Chiang8344b562008-06-10 15:30:42 -0600122 return AE_OK;
123
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000124 /*
125 * There may be multiple PCI functions associated with the same slot.
126 * Check whether PCI slot has already been created for this PCI device.
127 */
128 list_for_each_entry(slot, &slot_list, list) {
129 pci_slot = slot->pci_slot;
130 if (pci_slot->bus == pci_bus && pci_slot->number == device)
131 return AE_OK;
132 }
133
Alex Chiang8344b562008-06-10 15:30:42 -0600134 slot = kmalloc(sizeof(*slot), GFP_KERNEL);
135 if (!slot) {
136 err("%s: cannot allocate memory\n", __func__);
137 return AE_OK;
138 }
139
Alex Chiang7e24bc12009-08-04 14:44:17 -0600140 snprintf(name, sizeof(name), "%llu", sun);
Alex Chiang828f3762008-10-20 17:40:52 -0600141 pci_slot = pci_create_slot(pci_bus, device, name, NULL);
Alex Chiang8344b562008-06-10 15:30:42 -0600142 if (IS_ERR(pci_slot)) {
143 err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
144 kfree(slot);
Alex Chiange4268aa2008-07-17 11:13:32 -0600145 return AE_OK;
Alex Chiang8344b562008-06-10 15:30:42 -0600146 }
147
Alex Chiang8344b562008-06-10 15:30:42 -0600148 slot->pci_slot = pci_slot;
Alex Chiang8344b562008-06-10 15:30:42 -0600149 list_add(&slot->list, &slot_list);
Alex Chiang8344b562008-06-10 15:30:42 -0600150
Alex Chiang72800362009-03-30 10:50:19 -0600151 get_device(&pci_bus->dev);
152
Alex Chiang8344b562008-06-10 15:30:42 -0600153 dbg("pci_slot: %p, pci_bus: %x, device: %d, name: %s\n",
154 pci_slot, pci_bus->number, device, name);
155
156 return AE_OK;
157}
158
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200159void acpi_pci_slot_enumerate(struct pci_bus *bus)
Alex Chiang8344b562008-06-10 15:30:42 -0600160{
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200161 acpi_handle handle = ACPI_HANDLE(bus->bridge);
162
163 if (handle) {
164 mutex_lock(&slot_list_lock);
165 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
166 register_slot, NULL, bus, NULL);
167 mutex_unlock(&slot_list_lock);
168 }
Alex Chiang8344b562008-06-10 15:30:42 -0600169}
170
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000171void acpi_pci_slot_remove(struct pci_bus *bus)
Alex Chiang8344b562008-06-10 15:30:42 -0600172{
173 struct acpi_pci_slot *slot, *tmp;
174
175 mutex_lock(&slot_list_lock);
176 list_for_each_entry_safe(slot, tmp, &slot_list, list) {
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000177 if (slot->pci_slot->bus == bus) {
Alex Chiang8344b562008-06-10 15:30:42 -0600178 list_del(&slot->list);
179 pci_destroy_slot(slot->pci_slot);
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000180 put_device(&bus->dev);
Alex Chiang8344b562008-06-10 15:30:42 -0600181 kfree(slot);
182 }
183 }
184 mutex_unlock(&slot_list_lock);
185}
186
187static int do_sta_before_sun(const struct dmi_system_id *d)
188{
189 info("%s detected: will evaluate _STA before calling _SUN\n", d->ident);
190 check_sta_before_sun = 1;
191 return 0;
192}
193
194static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
195 /*
196 * Fujitsu Primequest machines will return 1023 to indicate an
197 * error if the _SUN method is evaluated on SxFy objects that
198 * are not present (as indicated by _STA), so for those machines,
199 * we want to check _STA before evaluating _SUN.
200 */
201 {
202 .callback = do_sta_before_sun,
203 .ident = "Fujitsu PRIMEQUEST",
204 .matches = {
205 DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"),
206 DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"),
207 },
208 },
209 {}
210};
211
Jiang Liuab1a2e02013-01-19 00:07:42 +0800212void __init acpi_pci_slot_init(void)
Alex Chiang8344b562008-06-10 15:30:42 -0600213{
214 dmi_check_system(acpi_pci_slot_dmi_table);
Alex Chiang8344b562008-06-10 15:30:42 -0600215}