Commit | Line | Data |
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8344b568 AC |
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 | * | |
e4268aad AC |
9 | * Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P. |
10 | * Alex Chiang <achiang@hp.com> | |
8344b568 | 11 | * |
5c0b04e3 JL |
12 | * Copyright (C) 2013 Huawei Tech. Co., Ltd. |
13 | * Jiang Liu <jiang.liu@huawei.com> | |
14 | * | |
8344b568 AC |
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. | |
8344b568 AC |
23 | */ |
24 | ||
2cfd93dd JP |
25 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
26 | ||
8344b568 | 27 | #include <linux/kernel.h> |
8344b568 | 28 | #include <linux/init.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
8344b568 | 30 | #include <linux/types.h> |
5c0b04e3 | 31 | #include <linux/list.h> |
8344b568 AC |
32 | #include <linux/pci.h> |
33 | #include <linux/acpi.h> | |
eb27cae8 | 34 | #include <linux/dmi.h> |
e22e58a4 | 35 | #include <linux/pci-acpi.h> |
8344b568 | 36 | |
8344b568 AC |
37 | static int check_sta_before_sun; |
38 | ||
8344b568 AC |
39 | #define _COMPONENT ACPI_PCI_COMPONENT |
40 | ACPI_MODULE_NAME("pci_slot"); | |
41 | ||
7e24bc1c | 42 | #define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */ |
8344b568 AC |
43 | |
44 | struct acpi_pci_slot { | |
8344b568 AC |
45 | struct pci_slot *pci_slot; /* corresponding pci_slot */ |
46 | struct list_head list; /* node in the list of slots */ | |
47 | }; | |
48 | ||
8344b568 AC |
49 | static LIST_HEAD(slot_list); |
50 | static DEFINE_MUTEX(slot_list_lock); | |
8344b568 AC |
51 | |
52 | static int | |
27663c58 | 53 | check_slot(acpi_handle handle, unsigned long long *sun) |
8344b568 | 54 | { |
362b7077 | 55 | int device = -1; |
27663c58 | 56 | unsigned long long adr, sta; |
8344b568 AC |
57 | acpi_status status; |
58 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
59 | ||
60 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
409ffed2 | 61 | pr_debug("Checking slot on path: %s\n", (char *)buffer.pointer); |
8344b568 AC |
62 | |
63 | if (check_sta_before_sun) { | |
64 | /* If SxFy doesn't have _STA, we just assume it's there */ | |
65 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
362b7077 | 66 | if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT)) |
8344b568 | 67 | goto out; |
8344b568 AC |
68 | } |
69 | ||
70 | status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); | |
71 | if (ACPI_FAILURE(status)) { | |
409ffed2 JP |
72 | pr_debug("_ADR returned %d on %s\n", |
73 | status, (char *)buffer.pointer); | |
8344b568 AC |
74 | goto out; |
75 | } | |
76 | ||
8344b568 AC |
77 | /* No _SUN == not a slot == bail */ |
78 | status = acpi_evaluate_integer(handle, "_SUN", NULL, sun); | |
79 | if (ACPI_FAILURE(status)) { | |
409ffed2 JP |
80 | pr_debug("_SUN returned %d on %s\n", |
81 | status, (char *)buffer.pointer); | |
8344b568 AC |
82 | goto out; |
83 | } | |
84 | ||
362b7077 | 85 | device = (adr >> 16) & 0xffff; |
8344b568 AC |
86 | out: |
87 | kfree(buffer.pointer); | |
362b7077 | 88 | return device; |
8344b568 AC |
89 | } |
90 | ||
8344b568 | 91 | /* |
5c0b04e3 | 92 | * Check whether handle has an associated slot and create PCI slot if it has. |
8344b568 AC |
93 | */ |
94 | static acpi_status | |
95 | register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) | |
96 | { | |
97 | int device; | |
27663c58 | 98 | unsigned long long sun; |
8344b568 AC |
99 | char name[SLOT_NAME_SIZE]; |
100 | struct acpi_pci_slot *slot; | |
101 | struct pci_slot *pci_slot; | |
5c0b04e3 | 102 | struct pci_bus *pci_bus = context; |
8344b568 | 103 | |
362b7077 MW |
104 | device = check_slot(handle, &sun); |
105 | if (device < 0) | |
8344b568 AC |
106 | return AE_OK; |
107 | ||
5c0b04e3 JL |
108 | /* |
109 | * There may be multiple PCI functions associated with the same slot. | |
110 | * Check whether PCI slot has already been created for this PCI device. | |
111 | */ | |
112 | list_for_each_entry(slot, &slot_list, list) { | |
113 | pci_slot = slot->pci_slot; | |
114 | if (pci_slot->bus == pci_bus && pci_slot->number == device) | |
115 | return AE_OK; | |
116 | } | |
117 | ||
8344b568 | 118 | slot = kmalloc(sizeof(*slot), GFP_KERNEL); |
2cfd93dd | 119 | if (!slot) |
8344b568 | 120 | return AE_OK; |
8344b568 | 121 | |
7e24bc1c | 122 | snprintf(name, sizeof(name), "%llu", sun); |
828f3768 | 123 | pci_slot = pci_create_slot(pci_bus, device, name, NULL); |
8344b568 | 124 | if (IS_ERR(pci_slot)) { |
2cfd93dd | 125 | pr_err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot)); |
8344b568 | 126 | kfree(slot); |
e4268aad | 127 | return AE_OK; |
8344b568 AC |
128 | } |
129 | ||
8344b568 | 130 | slot->pci_slot = pci_slot; |
8344b568 | 131 | list_add(&slot->list, &slot_list); |
8344b568 | 132 | |
72800360 AC |
133 | get_device(&pci_bus->dev); |
134 | ||
409ffed2 JP |
135 | pr_debug("%p, pci_bus: %x, device: %d, name: %s\n", |
136 | pci_slot, pci_bus->number, device, name); | |
8344b568 AC |
137 | |
138 | return AE_OK; | |
139 | } | |
140 | ||
be1c9de9 | 141 | void acpi_pci_slot_enumerate(struct pci_bus *bus) |
8344b568 | 142 | { |
be1c9de9 RW |
143 | acpi_handle handle = ACPI_HANDLE(bus->bridge); |
144 | ||
145 | if (handle) { | |
146 | mutex_lock(&slot_list_lock); | |
147 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, | |
148 | register_slot, NULL, bus, NULL); | |
149 | mutex_unlock(&slot_list_lock); | |
150 | } | |
8344b568 AC |
151 | } |
152 | ||
5c0b04e3 | 153 | void acpi_pci_slot_remove(struct pci_bus *bus) |
8344b568 AC |
154 | { |
155 | struct acpi_pci_slot *slot, *tmp; | |
156 | ||
157 | mutex_lock(&slot_list_lock); | |
158 | list_for_each_entry_safe(slot, tmp, &slot_list, list) { | |
5c0b04e3 | 159 | if (slot->pci_slot->bus == bus) { |
8344b568 AC |
160 | list_del(&slot->list); |
161 | pci_destroy_slot(slot->pci_slot); | |
5c0b04e3 | 162 | put_device(&bus->dev); |
8344b568 AC |
163 | kfree(slot); |
164 | } | |
165 | } | |
166 | mutex_unlock(&slot_list_lock); | |
167 | } | |
168 | ||
169 | static int do_sta_before_sun(const struct dmi_system_id *d) | |
170 | { | |
2cfd93dd JP |
171 | pr_info("%s detected: will evaluate _STA before calling _SUN\n", |
172 | d->ident); | |
8344b568 AC |
173 | check_sta_before_sun = 1; |
174 | return 0; | |
175 | } | |
176 | ||
177 | static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = { | |
178 | /* | |
179 | * Fujitsu Primequest machines will return 1023 to indicate an | |
180 | * error if the _SUN method is evaluated on SxFy objects that | |
181 | * are not present (as indicated by _STA), so for those machines, | |
182 | * we want to check _STA before evaluating _SUN. | |
183 | */ | |
184 | { | |
185 | .callback = do_sta_before_sun, | |
186 | .ident = "Fujitsu PRIMEQUEST", | |
187 | .matches = { | |
188 | DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"), | |
189 | DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"), | |
190 | }, | |
191 | }, | |
192 | {} | |
193 | }; | |
194 | ||
ab1a2e03 | 195 | void __init acpi_pci_slot_init(void) |
8344b568 AC |
196 | { |
197 | dmi_check_system(acpi_pci_slot_dmi_table); | |
8344b568 | 198 | } |