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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 AC |
11 | * |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms and conditions of the GNU General Public License, | |
14 | * version 2, as published by the Free Software Foundation. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, but | |
17 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along | |
22 | * with this program; if not, write to the Free Software Foundation, Inc., | |
23 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
8344b568 AC |
30 | #include <linux/types.h> |
31 | #include <linux/pci.h> | |
32 | #include <linux/acpi.h> | |
33 | #include <acpi/acpi_bus.h> | |
34 | #include <acpi/acpi_drivers.h> | |
eb27cae8 | 35 | #include <linux/dmi.h> |
8344b568 AC |
36 | |
37 | static int debug; | |
38 | static int check_sta_before_sun; | |
39 | ||
40 | #define DRIVER_VERSION "0.1" | |
41 | #define DRIVER_AUTHOR "Alex Chiang <achiang@hp.com>" | |
42 | #define DRIVER_DESC "ACPI PCI Slot Detection Driver" | |
43 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
44 | MODULE_DESCRIPTION(DRIVER_DESC); | |
45 | MODULE_LICENSE("GPL"); | |
46 | MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); | |
47 | module_param(debug, bool, 0644); | |
48 | ||
49 | #define _COMPONENT ACPI_PCI_COMPONENT | |
50 | ACPI_MODULE_NAME("pci_slot"); | |
51 | ||
52 | #define MY_NAME "pci_slot" | |
53 | #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg) | |
54 | #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg) | |
55 | #define dbg(format, arg...) \ | |
56 | do { \ | |
57 | if (debug) \ | |
58 | printk(KERN_DEBUG "%s: " format, \ | |
59 | MY_NAME , ## arg); \ | |
60 | } while (0) | |
61 | ||
7e24bc1c | 62 | #define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */ |
8344b568 AC |
63 | |
64 | struct acpi_pci_slot { | |
65 | acpi_handle root_handle; /* handle of the root bridge */ | |
66 | struct pci_slot *pci_slot; /* corresponding pci_slot */ | |
67 | struct list_head list; /* node in the list of slots */ | |
68 | }; | |
69 | ||
70 | static int acpi_pci_slot_add(acpi_handle handle); | |
71 | static void acpi_pci_slot_remove(acpi_handle handle); | |
72 | ||
73 | static LIST_HEAD(slot_list); | |
74 | static DEFINE_MUTEX(slot_list_lock); | |
75 | static struct acpi_pci_driver acpi_pci_slot_driver = { | |
76 | .add = acpi_pci_slot_add, | |
77 | .remove = acpi_pci_slot_remove, | |
78 | }; | |
79 | ||
80 | static int | |
27663c58 | 81 | check_slot(acpi_handle handle, unsigned long long *sun) |
8344b568 | 82 | { |
362b7077 | 83 | int device = -1; |
27663c58 | 84 | unsigned long long adr, sta; |
8344b568 AC |
85 | acpi_status status; |
86 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
87 | ||
88 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
89 | dbg("Checking slot on path: %s\n", (char *)buffer.pointer); | |
90 | ||
91 | if (check_sta_before_sun) { | |
92 | /* If SxFy doesn't have _STA, we just assume it's there */ | |
93 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
362b7077 | 94 | if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT)) |
8344b568 | 95 | goto out; |
8344b568 AC |
96 | } |
97 | ||
98 | status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); | |
99 | if (ACPI_FAILURE(status)) { | |
100 | dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer); | |
8344b568 AC |
101 | goto out; |
102 | } | |
103 | ||
8344b568 AC |
104 | /* No _SUN == not a slot == bail */ |
105 | status = acpi_evaluate_integer(handle, "_SUN", NULL, sun); | |
106 | if (ACPI_FAILURE(status)) { | |
107 | dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer); | |
8344b568 AC |
108 | goto out; |
109 | } | |
110 | ||
362b7077 | 111 | device = (adr >> 16) & 0xffff; |
8344b568 AC |
112 | out: |
113 | kfree(buffer.pointer); | |
362b7077 | 114 | return device; |
8344b568 AC |
115 | } |
116 | ||
117 | struct callback_args { | |
118 | acpi_walk_callback user_function; /* only for walk_p2p_bridge */ | |
119 | struct pci_bus *pci_bus; | |
120 | acpi_handle root_handle; | |
121 | }; | |
122 | ||
123 | /* | |
124 | * register_slot | |
125 | * | |
126 | * Called once for each SxFy object in the namespace. Don't worry about | |
127 | * calling pci_create_slot multiple times for the same pci_bus:device, | |
128 | * since each subsequent call simply bumps the refcount on the pci_slot. | |
129 | * | |
130 | * The number of calls to pci_destroy_slot from unregister_slot is | |
131 | * symmetrical. | |
132 | */ | |
133 | static acpi_status | |
134 | register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) | |
135 | { | |
136 | int device; | |
27663c58 | 137 | unsigned long long sun; |
8344b568 AC |
138 | char name[SLOT_NAME_SIZE]; |
139 | struct acpi_pci_slot *slot; | |
140 | struct pci_slot *pci_slot; | |
141 | struct callback_args *parent_context = context; | |
142 | struct pci_bus *pci_bus = parent_context->pci_bus; | |
143 | ||
362b7077 MW |
144 | device = check_slot(handle, &sun); |
145 | if (device < 0) | |
8344b568 AC |
146 | return AE_OK; |
147 | ||
148 | slot = kmalloc(sizeof(*slot), GFP_KERNEL); | |
149 | if (!slot) { | |
150 | err("%s: cannot allocate memory\n", __func__); | |
151 | return AE_OK; | |
152 | } | |
153 | ||
7e24bc1c | 154 | snprintf(name, sizeof(name), "%llu", sun); |
828f3768 | 155 | pci_slot = pci_create_slot(pci_bus, device, name, NULL); |
8344b568 AC |
156 | if (IS_ERR(pci_slot)) { |
157 | err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot)); | |
158 | kfree(slot); | |
e4268aad | 159 | return AE_OK; |
8344b568 AC |
160 | } |
161 | ||
162 | slot->root_handle = parent_context->root_handle; | |
163 | slot->pci_slot = pci_slot; | |
164 | INIT_LIST_HEAD(&slot->list); | |
165 | mutex_lock(&slot_list_lock); | |
166 | list_add(&slot->list, &slot_list); | |
167 | mutex_unlock(&slot_list_lock); | |
168 | ||
72800360 AC |
169 | get_device(&pci_bus->dev); |
170 | ||
8344b568 AC |
171 | dbg("pci_slot: %p, pci_bus: %x, device: %d, name: %s\n", |
172 | pci_slot, pci_bus->number, device, name); | |
173 | ||
174 | return AE_OK; | |
175 | } | |
176 | ||
177 | /* | |
178 | * walk_p2p_bridge - discover and walk p2p bridges | |
179 | * @handle: points to an acpi_pci_root | |
180 | * @context: p2p_bridge_context pointer | |
181 | * | |
182 | * Note that when we call ourselves recursively, we pass a different | |
183 | * value of pci_bus in the child_context. | |
184 | */ | |
185 | static acpi_status | |
186 | walk_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) | |
187 | { | |
188 | int device, function; | |
27663c58 | 189 | unsigned long long adr; |
8344b568 AC |
190 | acpi_status status; |
191 | acpi_handle dummy_handle; | |
192 | acpi_walk_callback user_function; | |
193 | ||
194 | struct pci_dev *dev; | |
195 | struct pci_bus *pci_bus; | |
196 | struct callback_args child_context; | |
197 | struct callback_args *parent_context = context; | |
198 | ||
199 | pci_bus = parent_context->pci_bus; | |
200 | user_function = parent_context->user_function; | |
201 | ||
202 | status = acpi_get_handle(handle, "_ADR", &dummy_handle); | |
203 | if (ACPI_FAILURE(status)) | |
204 | return AE_OK; | |
205 | ||
206 | status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); | |
207 | if (ACPI_FAILURE(status)) | |
208 | return AE_OK; | |
209 | ||
210 | device = (adr >> 16) & 0xffff; | |
211 | function = adr & 0xffff; | |
212 | ||
213 | dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function)); | |
214 | if (!dev || !dev->subordinate) | |
215 | goto out; | |
216 | ||
217 | child_context.pci_bus = dev->subordinate; | |
218 | child_context.user_function = user_function; | |
219 | child_context.root_handle = parent_context->root_handle; | |
220 | ||
221 | dbg("p2p bridge walk, pci_bus = %x\n", dev->subordinate->number); | |
222 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, | |
2263576c | 223 | user_function, NULL, &child_context, NULL); |
8344b568 AC |
224 | if (ACPI_FAILURE(status)) |
225 | goto out; | |
226 | ||
227 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, | |
2263576c | 228 | walk_p2p_bridge, NULL, &child_context, NULL); |
8344b568 AC |
229 | out: |
230 | pci_dev_put(dev); | |
231 | return AE_OK; | |
232 | } | |
233 | ||
234 | /* | |
235 | * walk_root_bridge - generic root bridge walker | |
236 | * @handle: points to an acpi_pci_root | |
237 | * @user_function: user callback for slot objects | |
238 | * | |
239 | * Call user_function for all objects underneath this root bridge. | |
240 | * Walk p2p bridges underneath us and call user_function on those too. | |
241 | */ | |
242 | static int | |
243 | walk_root_bridge(acpi_handle handle, acpi_walk_callback user_function) | |
244 | { | |
245 | int seg, bus; | |
27663c58 | 246 | unsigned long long tmp; |
8344b568 AC |
247 | acpi_status status; |
248 | acpi_handle dummy_handle; | |
249 | struct pci_bus *pci_bus; | |
250 | struct callback_args context; | |
251 | ||
252 | /* If the bridge doesn't have _STA, we assume it is always there */ | |
253 | status = acpi_get_handle(handle, "_STA", &dummy_handle); | |
254 | if (ACPI_SUCCESS(status)) { | |
255 | status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); | |
256 | if (ACPI_FAILURE(status)) { | |
257 | info("%s: _STA evaluation failure\n", __func__); | |
258 | return 0; | |
259 | } | |
260 | if ((tmp & ACPI_STA_DEVICE_FUNCTIONING) == 0) | |
261 | /* don't register this object */ | |
262 | return 0; | |
263 | } | |
264 | ||
265 | status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp); | |
266 | seg = ACPI_SUCCESS(status) ? tmp : 0; | |
267 | ||
268 | status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp); | |
269 | bus = ACPI_SUCCESS(status) ? tmp : 0; | |
270 | ||
271 | pci_bus = pci_find_bus(seg, bus); | |
272 | if (!pci_bus) | |
273 | return 0; | |
274 | ||
275 | context.pci_bus = pci_bus; | |
276 | context.user_function = user_function; | |
277 | context.root_handle = handle; | |
278 | ||
279 | dbg("root bridge walk, pci_bus = %x\n", pci_bus->number); | |
280 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, | |
2263576c | 281 | user_function, NULL, &context, NULL); |
8344b568 AC |
282 | if (ACPI_FAILURE(status)) |
283 | return status; | |
284 | ||
285 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, | |
2263576c | 286 | walk_p2p_bridge, NULL, &context, NULL); |
8344b568 AC |
287 | if (ACPI_FAILURE(status)) |
288 | err("%s: walk_p2p_bridge failure - %d\n", __func__, status); | |
289 | ||
290 | return status; | |
291 | } | |
292 | ||
293 | /* | |
294 | * acpi_pci_slot_add | |
295 | * @handle: points to an acpi_pci_root | |
296 | */ | |
297 | static int | |
298 | acpi_pci_slot_add(acpi_handle handle) | |
299 | { | |
300 | acpi_status status; | |
301 | ||
302 | status = walk_root_bridge(handle, register_slot); | |
303 | if (ACPI_FAILURE(status)) | |
304 | err("%s: register_slot failure - %d\n", __func__, status); | |
305 | ||
306 | return status; | |
307 | } | |
308 | ||
309 | /* | |
310 | * acpi_pci_slot_remove | |
311 | * @handle: points to an acpi_pci_root | |
312 | */ | |
313 | static void | |
314 | acpi_pci_slot_remove(acpi_handle handle) | |
315 | { | |
316 | struct acpi_pci_slot *slot, *tmp; | |
72800360 | 317 | struct pci_bus *pbus; |
8344b568 AC |
318 | |
319 | mutex_lock(&slot_list_lock); | |
320 | list_for_each_entry_safe(slot, tmp, &slot_list, list) { | |
321 | if (slot->root_handle == handle) { | |
322 | list_del(&slot->list); | |
72800360 | 323 | pbus = slot->pci_slot->bus; |
8344b568 | 324 | pci_destroy_slot(slot->pci_slot); |
72800360 | 325 | put_device(&pbus->dev); |
8344b568 AC |
326 | kfree(slot); |
327 | } | |
328 | } | |
329 | mutex_unlock(&slot_list_lock); | |
330 | } | |
331 | ||
332 | static int do_sta_before_sun(const struct dmi_system_id *d) | |
333 | { | |
334 | info("%s detected: will evaluate _STA before calling _SUN\n", d->ident); | |
335 | check_sta_before_sun = 1; | |
336 | return 0; | |
337 | } | |
338 | ||
339 | static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = { | |
340 | /* | |
341 | * Fujitsu Primequest machines will return 1023 to indicate an | |
342 | * error if the _SUN method is evaluated on SxFy objects that | |
343 | * are not present (as indicated by _STA), so for those machines, | |
344 | * we want to check _STA before evaluating _SUN. | |
345 | */ | |
346 | { | |
347 | .callback = do_sta_before_sun, | |
348 | .ident = "Fujitsu PRIMEQUEST", | |
349 | .matches = { | |
350 | DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"), | |
351 | DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"), | |
352 | }, | |
353 | }, | |
354 | {} | |
355 | }; | |
356 | ||
357 | static int __init | |
358 | acpi_pci_slot_init(void) | |
359 | { | |
360 | dmi_check_system(acpi_pci_slot_dmi_table); | |
361 | acpi_pci_register_driver(&acpi_pci_slot_driver); | |
362 | return 0; | |
363 | } | |
364 | ||
365 | static void __exit | |
366 | acpi_pci_slot_exit(void) | |
367 | { | |
368 | acpi_pci_unregister_driver(&acpi_pci_slot_driver); | |
369 | } | |
370 | ||
371 | module_init(acpi_pci_slot_init); | |
372 | module_exit(acpi_pci_slot_exit); |