1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/types.h>
30#include <linux/pci.h>
31#include <linux/acpi.h>
32#include <acpi/acpi_bus.h>
33#include <acpi/acpi_drivers.h>
34#include <linux/dmi.h>
35
36static int debug;
37static 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"
52#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
53#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
54#define dbg(format, arg...) \
55 do { \
56 if (debug) \
57 printk(KERN_DEBUG "%s: " format, \
58 MY_NAME , ## arg); \
59 } while (0)
60
61#define SLOT_NAME_SIZE 21
62
63struct acpi_pci_slot {
64 acpi_handle root_handle;
65 struct pci_slot *pci_slot;
66 struct list_head list;
67};
68
69static int acpi_pci_slot_add(acpi_handle handle);
70static void acpi_pci_slot_remove(acpi_handle handle);
71
72static LIST_HEAD(slot_list);
73static DEFINE_MUTEX(slot_list_lock);
74static struct acpi_pci_driver acpi_pci_slot_driver = {
75 .add = acpi_pci_slot_add,
76 .remove = acpi_pci_slot_remove,
77};
78
79static int
80check_slot(acpi_handle handle, unsigned long long *sun)
81{
82 int device = -1;
83 unsigned long long adr, sta;
84 acpi_status status;
85 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
86
87 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
88 dbg("Checking slot on path: %s\n", (char *)buffer.pointer);
89
90 if (check_sta_before_sun) {
91
92 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
93 if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
94 goto out;
95 }
96
97 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
98 if (ACPI_FAILURE(status)) {
99 dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer);
100 goto out;
101 }
102
103
104 status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
105 if (ACPI_FAILURE(status)) {
106 dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer);
107 goto out;
108 }
109
110 device = (adr >> 16) & 0xffff;
111out:
112 kfree(buffer.pointer);
113 return device;
114}
115
116struct callback_args {
117 acpi_walk_callback user_function;
118 struct pci_bus *pci_bus;
119 acpi_handle root_handle;
120};
121
122
123
124
125
126
127
128
129
130
131
132static acpi_status
133register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
134{
135 int device;
136 unsigned long long sun;
137 char name[SLOT_NAME_SIZE];
138 struct acpi_pci_slot *slot;
139 struct pci_slot *pci_slot;
140 struct callback_args *parent_context = context;
141 struct pci_bus *pci_bus = parent_context->pci_bus;
142
143 device = check_slot(handle, &sun);
144 if (device < 0)
145 return AE_OK;
146
147 slot = kmalloc(sizeof(*slot), GFP_KERNEL);
148 if (!slot) {
149 err("%s: cannot allocate memory\n", __func__);
150 return AE_OK;
151 }
152
153 snprintf(name, sizeof(name), "%llu", sun);
154 pci_slot = pci_create_slot(pci_bus, device, name, NULL);
155 if (IS_ERR(pci_slot)) {
156 err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
157 kfree(slot);
158 return AE_OK;
159 }
160
161 slot->root_handle = parent_context->root_handle;
162 slot->pci_slot = pci_slot;
163 INIT_LIST_HEAD(&slot->list);
164 mutex_lock(&slot_list_lock);
165 list_add(&slot->list, &slot_list);
166 mutex_unlock(&slot_list_lock);
167
168 get_device(&pci_bus->dev);
169
170 dbg("pci_slot: %p, pci_bus: %x, device: %d, name: %s\n",
171 pci_slot, pci_bus->number, device, name);
172
173 return AE_OK;
174}
175
176
177
178
179
180
181
182
183
184static acpi_status
185walk_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
186{
187 int device, function;
188 unsigned long long adr;
189 acpi_status status;
190 acpi_handle dummy_handle;
191 acpi_walk_callback user_function;
192
193 struct pci_dev *dev;
194 struct pci_bus *pci_bus;
195 struct callback_args child_context;
196 struct callback_args *parent_context = context;
197
198 pci_bus = parent_context->pci_bus;
199 user_function = parent_context->user_function;
200
201 status = acpi_get_handle(handle, "_ADR", &dummy_handle);
202 if (ACPI_FAILURE(status))
203 return AE_OK;
204
205 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
206 if (ACPI_FAILURE(status))
207 return AE_OK;
208
209 device = (adr >> 16) & 0xffff;
210 function = adr & 0xffff;
211
212 dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
213 if (!dev || !dev->subordinate)
214 goto out;
215
216 child_context.pci_bus = dev->subordinate;
217 child_context.user_function = user_function;
218 child_context.root_handle = parent_context->root_handle;
219
220 dbg("p2p bridge walk, pci_bus = %x\n", dev->subordinate->number);
221 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
222 user_function, &child_context, NULL);
223 if (ACPI_FAILURE(status))
224 goto out;
225
226 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
227 walk_p2p_bridge, &child_context, NULL);
228out:
229 pci_dev_put(dev);
230 return AE_OK;
231}
232
233
234
235
236
237
238
239
240
241static int
242walk_root_bridge(acpi_handle handle, acpi_walk_callback user_function)
243{
244 int seg, bus;
245 unsigned long long tmp;
246 acpi_status status;
247 acpi_handle dummy_handle;
248 struct pci_bus *pci_bus;
249 struct callback_args context;
250
251
252 status = acpi_get_handle(handle, "_STA", &dummy_handle);
253 if (ACPI_SUCCESS(status)) {
254 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
255 if (ACPI_FAILURE(status)) {
256 info("%s: _STA evaluation failure\n", __func__);
257 return 0;
258 }
259 if ((tmp & ACPI_STA_DEVICE_FUNCTIONING) == 0)
260
261 return 0;
262 }
263
264 status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
265 seg = ACPI_SUCCESS(status) ? tmp : 0;
266
267 status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
268 bus = ACPI_SUCCESS(status) ? tmp : 0;
269
270 pci_bus = pci_find_bus(seg, bus);
271 if (!pci_bus)
272 return 0;
273
274 context.pci_bus = pci_bus;
275 context.user_function = user_function;
276 context.root_handle = handle;
277
278 dbg("root bridge walk, pci_bus = %x\n", pci_bus->number);
279 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
280 user_function, &context, NULL);
281 if (ACPI_FAILURE(status))
282 return status;
283
284 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
285 walk_p2p_bridge, &context, NULL);
286 if (ACPI_FAILURE(status))
287 err("%s: walk_p2p_bridge failure - %d\n", __func__, status);
288
289 return status;
290}
291
292
293
294
295
296static int
297acpi_pci_slot_add(acpi_handle handle)
298{
299 acpi_status status;
300
301 status = walk_root_bridge(handle, register_slot);
302 if (ACPI_FAILURE(status))
303 err("%s: register_slot failure - %d\n", __func__, status);
304
305 return status;
306}
307
308
309
310
311
312static void
313acpi_pci_slot_remove(acpi_handle handle)
314{
315 struct acpi_pci_slot *slot, *tmp;
316 struct pci_bus *pbus;
317
318 mutex_lock(&slot_list_lock);
319 list_for_each_entry_safe(slot, tmp, &slot_list, list) {
320 if (slot->root_handle == handle) {
321 list_del(&slot->list);
322 pbus = slot->pci_slot->bus;
323 pci_destroy_slot(slot->pci_slot);
324 put_device(&pbus->dev);
325 kfree(slot);
326 }
327 }
328 mutex_unlock(&slot_list_lock);
329}
330
331static int do_sta_before_sun(const struct dmi_system_id *d)
332{
333 info("%s detected: will evaluate _STA before calling _SUN\n", d->ident);
334 check_sta_before_sun = 1;
335 return 0;
336}
337
338static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
339
340
341
342
343
344
345 {
346 .callback = do_sta_before_sun,
347 .ident = "Fujitsu PRIMEQUEST",
348 .matches = {
349 DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"),
350 DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"),
351 },
352 },
353 {}
354};
355
356static int __init
357acpi_pci_slot_init(void)
358{
359 dmi_check_system(acpi_pci_slot_dmi_table);
360 acpi_pci_register_driver(&acpi_pci_slot_driver);
361 return 0;
362}
363
364static void __exit
365acpi_pci_slot_exit(void)
366{
367 acpi_pci_unregister_driver(&acpi_pci_slot_driver);
368}
369
370module_init(acpi_pci_slot_init);
371module_exit(acpi_pci_slot_exit);
372