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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * pci_slot.c - ACPI PCI Slot Driver
4 *
5 * The code here is heavily leveraged from the acpiphp module.
6 * Thanks to Matthew Wilcox <matthew@wil.cx> for much guidance.
7 * Thanks to Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> for code
8 * review and fixes.
9 *
10 * Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
11 * Alex Chiang <achiang@hp.com>
12 *
13 * Copyright (C) 2013 Huawei Tech. Co., Ltd.
14 * Jiang Liu <jiang.liu@huawei.com>
15 */
16
17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19#include <linux/kernel.h>
20#include <linux/init.h>
21#include <linux/slab.h>
22#include <linux/types.h>
23#include <linux/list.h>
24#include <linux/pci.h>
25#include <linux/acpi.h>
26#include <linux/dmi.h>
27#include <linux/pci-acpi.h>
28
29static int check_sta_before_sun;
30
31#define _COMPONENT ACPI_PCI_COMPONENT
32ACPI_MODULE_NAME("pci_slot");
33
34#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
35
36struct acpi_pci_slot {
37 struct pci_slot *pci_slot; /* corresponding pci_slot */
38 struct list_head list; /* node in the list of slots */
39};
40
41static LIST_HEAD(slot_list);
42static DEFINE_MUTEX(slot_list_lock);
43
44static int
45check_slot(acpi_handle handle, unsigned long long *sun)
46{
47 int device = -1;
48 unsigned long long adr, sta;
49 acpi_status status;
50 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
51
52 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
53 pr_debug("Checking slot on path: %s\n", (char *)buffer.pointer);
54
55 if (check_sta_before_sun) {
56 /* If SxFy doesn't have _STA, we just assume it's there */
57 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
58 if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
59 goto out;
60 }
61
62 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
63 if (ACPI_FAILURE(status)) {
64 pr_debug("_ADR returned %d on %s\n",
65 status, (char *)buffer.pointer);
66 goto out;
67 }
68
69 /* No _SUN == not a slot == bail */
70 status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
71 if (ACPI_FAILURE(status)) {
72 pr_debug("_SUN returned %d on %s\n",
73 status, (char *)buffer.pointer);
74 goto out;
75 }
76
77 device = (adr >> 16) & 0xffff;
78out:
79 kfree(buffer.pointer);
80 return device;
81}
82
83/*
84 * Check whether handle has an associated slot and create PCI slot if it has.
85 */
86static acpi_status
87register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
88{
89 int device;
90 unsigned long long sun;
91 char name[SLOT_NAME_SIZE];
92 struct acpi_pci_slot *slot;
93 struct pci_slot *pci_slot;
94 struct pci_bus *pci_bus = context;
95
96 device = check_slot(handle, &sun);
97 if (device < 0)
98 return AE_OK;
99
100 /*
101 * There may be multiple PCI functions associated with the same slot.
102 * Check whether PCI slot has already been created for this PCI device.
103 */
104 list_for_each_entry(slot, &slot_list, list) {
105 pci_slot = slot->pci_slot;
106 if (pci_slot->bus == pci_bus && pci_slot->number == device)
107 return AE_OK;
108 }
109
110 slot = kmalloc(sizeof(*slot), GFP_KERNEL);
111 if (!slot)
112 return AE_OK;
113
114 snprintf(name, sizeof(name), "%llu", sun);
115 pci_slot = pci_create_slot(pci_bus, device, name, NULL);
116 if (IS_ERR(pci_slot)) {
117 pr_err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
118 kfree(slot);
119 return AE_OK;
120 }
121
122 slot->pci_slot = pci_slot;
123 list_add(&slot->list, &slot_list);
124
125 get_device(&pci_bus->dev);
126
127 pr_debug("%p, pci_bus: %x, device: %d, name: %s\n",
128 pci_slot, pci_bus->number, device, name);
129
130 return AE_OK;
131}
132
133void acpi_pci_slot_enumerate(struct pci_bus *bus)
134{
135 acpi_handle handle = ACPI_HANDLE(bus->bridge);
136
137 if (handle) {
138 mutex_lock(&slot_list_lock);
139 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
140 register_slot, NULL, bus, NULL);
141 mutex_unlock(&slot_list_lock);
142 }
143}
144
145void acpi_pci_slot_remove(struct pci_bus *bus)
146{
147 struct acpi_pci_slot *slot, *tmp;
148
149 mutex_lock(&slot_list_lock);
150 list_for_each_entry_safe(slot, tmp, &slot_list, list) {
151 if (slot->pci_slot->bus == bus) {
152 list_del(&slot->list);
153 pci_destroy_slot(slot->pci_slot);
154 put_device(&bus->dev);
155 kfree(slot);
156 }
157 }
158 mutex_unlock(&slot_list_lock);
159}
160
161static int do_sta_before_sun(const struct dmi_system_id *d)
162{
163 pr_info("%s detected: will evaluate _STA before calling _SUN\n",
164 d->ident);
165 check_sta_before_sun = 1;
166 return 0;
167}
168
169static const struct dmi_system_id acpi_pci_slot_dmi_table[] __initconst = {
170 /*
171 * Fujitsu Primequest machines will return 1023 to indicate an
172 * error if the _SUN method is evaluated on SxFy objects that
173 * are not present (as indicated by _STA), so for those machines,
174 * we want to check _STA before evaluating _SUN.
175 */
176 {
177 .callback = do_sta_before_sun,
178 .ident = "Fujitsu PRIMEQUEST",
179 .matches = {
180 DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"),
181 DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"),
182 },
183 },
184 {}
185};
186
187void __init acpi_pci_slot_init(void)
188{
189 dmi_check_system(acpi_pci_slot_dmi_table);
190}
1/*
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 *
9 * Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
10 * Alex Chiang <achiang@hp.com>
11 *
12 * Copyright (C) 2013 Huawei Tech. Co., Ltd.
13 * Jiang Liu <jiang.liu@huawei.com>
14 *
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.
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.
23 *
24 * You should have received a copy of the GNU General Public License along
25 * with this program; if not, write to the Free Software Foundation, Inc.,
26 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
27 */
28
29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/slab.h>
33#include <linux/types.h>
34#include <linux/list.h>
35#include <linux/pci.h>
36#include <linux/acpi.h>
37#include <linux/dmi.h>
38#include <linux/pci-acpi.h>
39
40static bool debug;
41static int check_sta_before_sun;
42
43#define DRIVER_VERSION "0.1"
44#define DRIVER_AUTHOR "Alex Chiang <achiang@hp.com>"
45#define DRIVER_DESC "ACPI PCI Slot Detection Driver"
46MODULE_AUTHOR(DRIVER_AUTHOR);
47MODULE_DESCRIPTION(DRIVER_DESC);
48MODULE_LICENSE("GPL");
49MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
50module_param(debug, bool, 0644);
51
52#define _COMPONENT ACPI_PCI_COMPONENT
53ACPI_MODULE_NAME("pci_slot");
54
55#define MY_NAME "pci_slot"
56#define err(format, arg...) pr_err("%s: " format , MY_NAME , ## arg)
57#define info(format, arg...) pr_info("%s: " format , MY_NAME , ## arg)
58#define dbg(format, arg...) \
59 do { \
60 if (debug) \
61 pr_debug("%s: " format, MY_NAME , ## arg); \
62 } while (0)
63
64#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
65
66struct acpi_pci_slot {
67 struct pci_slot *pci_slot; /* corresponding pci_slot */
68 struct list_head list; /* node in the list of slots */
69};
70
71static LIST_HEAD(slot_list);
72static DEFINE_MUTEX(slot_list_lock);
73
74static int
75check_slot(acpi_handle handle, unsigned long long *sun)
76{
77 int device = -1;
78 unsigned long long adr, sta;
79 acpi_status status;
80 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
81
82 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
83 dbg("Checking slot on path: %s\n", (char *)buffer.pointer);
84
85 if (check_sta_before_sun) {
86 /* If SxFy doesn't have _STA, we just assume it's there */
87 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
88 if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
89 goto out;
90 }
91
92 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
93 if (ACPI_FAILURE(status)) {
94 dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer);
95 goto out;
96 }
97
98 /* No _SUN == not a slot == bail */
99 status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
100 if (ACPI_FAILURE(status)) {
101 dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer);
102 goto out;
103 }
104
105 device = (adr >> 16) & 0xffff;
106out:
107 kfree(buffer.pointer);
108 return device;
109}
110
111/*
112 * Check whether handle has an associated slot and create PCI slot if it has.
113 */
114static acpi_status
115register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
116{
117 int device;
118 unsigned long long sun;
119 char name[SLOT_NAME_SIZE];
120 struct acpi_pci_slot *slot;
121 struct pci_slot *pci_slot;
122 struct pci_bus *pci_bus = context;
123
124 device = check_slot(handle, &sun);
125 if (device < 0)
126 return AE_OK;
127
128 /*
129 * There may be multiple PCI functions associated with the same slot.
130 * Check whether PCI slot has already been created for this PCI device.
131 */
132 list_for_each_entry(slot, &slot_list, list) {
133 pci_slot = slot->pci_slot;
134 if (pci_slot->bus == pci_bus && pci_slot->number == device)
135 return AE_OK;
136 }
137
138 slot = kmalloc(sizeof(*slot), GFP_KERNEL);
139 if (!slot) {
140 err("%s: cannot allocate memory\n", __func__);
141 return AE_OK;
142 }
143
144 snprintf(name, sizeof(name), "%llu", sun);
145 pci_slot = pci_create_slot(pci_bus, device, name, NULL);
146 if (IS_ERR(pci_slot)) {
147 err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
148 kfree(slot);
149 return AE_OK;
150 }
151
152 slot->pci_slot = pci_slot;
153 list_add(&slot->list, &slot_list);
154
155 get_device(&pci_bus->dev);
156
157 dbg("pci_slot: %p, pci_bus: %x, device: %d, name: %s\n",
158 pci_slot, pci_bus->number, device, name);
159
160 return AE_OK;
161}
162
163void acpi_pci_slot_enumerate(struct pci_bus *bus)
164{
165 acpi_handle handle = ACPI_HANDLE(bus->bridge);
166
167 if (handle) {
168 mutex_lock(&slot_list_lock);
169 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
170 register_slot, NULL, bus, NULL);
171 mutex_unlock(&slot_list_lock);
172 }
173}
174
175void acpi_pci_slot_remove(struct pci_bus *bus)
176{
177 struct acpi_pci_slot *slot, *tmp;
178
179 mutex_lock(&slot_list_lock);
180 list_for_each_entry_safe(slot, tmp, &slot_list, list) {
181 if (slot->pci_slot->bus == bus) {
182 list_del(&slot->list);
183 pci_destroy_slot(slot->pci_slot);
184 put_device(&bus->dev);
185 kfree(slot);
186 }
187 }
188 mutex_unlock(&slot_list_lock);
189}
190
191static int do_sta_before_sun(const struct dmi_system_id *d)
192{
193 info("%s detected: will evaluate _STA before calling _SUN\n", d->ident);
194 check_sta_before_sun = 1;
195 return 0;
196}
197
198static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
199 /*
200 * Fujitsu Primequest machines will return 1023 to indicate an
201 * error if the _SUN method is evaluated on SxFy objects that
202 * are not present (as indicated by _STA), so for those machines,
203 * we want to check _STA before evaluating _SUN.
204 */
205 {
206 .callback = do_sta_before_sun,
207 .ident = "Fujitsu PRIMEQUEST",
208 .matches = {
209 DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"),
210 DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"),
211 },
212 },
213 {}
214};
215
216void __init acpi_pci_slot_init(void)
217{
218 dmi_check_system(acpi_pci_slot_dmi_table);
219}