blob: 11f219743204fa9b8ffa6c7682d9f852d7838273 [file] [log] [blame]
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 *
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>
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>
Len Browneb27cae2009-07-06 23:40:19 -040034#include <linux/dmi.h>
Alex Chiang8344b562008-06-10 15:30:42 -060035
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
Alex Chiang7e24bc12009-08-04 14:44:17 -060061#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
Alex Chiang8344b562008-06-10 15:30:42 -060062
63struct acpi_pci_slot {
64 acpi_handle root_handle; /* handle of the root bridge */
65 struct pci_slot *pci_slot; /* corresponding pci_slot */
66 struct list_head list; /* node in the list of slots */
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
Matthew Wilcox27663c52008-10-10 02:22:59 -040080check_slot(acpi_handle handle, unsigned long long *sun)
Alex Chiang8344b562008-06-10 15:30:42 -060081{
Matthew Wilcox362b7072008-07-22 12:37:17 -060082 int device = -1;
Matthew Wilcox27663c52008-10-10 02:22:59 -040083 unsigned long long adr, sta;
Alex Chiang8344b562008-06-10 15:30:42 -060084 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 /* If SxFy doesn't have _STA, we just assume it's there */
92 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
Matthew Wilcox362b7072008-07-22 12:37:17 -060093 if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
Alex Chiang8344b562008-06-10 15:30:42 -060094 goto out;
Alex Chiang8344b562008-06-10 15:30:42 -060095 }
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);
Alex Chiang8344b562008-06-10 15:30:42 -0600100 goto out;
101 }
102
Alex Chiang8344b562008-06-10 15:30:42 -0600103 /* No _SUN == not a slot == bail */
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);
Alex Chiang8344b562008-06-10 15:30:42 -0600107 goto out;
108 }
109
Matthew Wilcox362b7072008-07-22 12:37:17 -0600110 device = (adr >> 16) & 0xffff;
Alex Chiang8344b562008-06-10 15:30:42 -0600111out:
112 kfree(buffer.pointer);
Matthew Wilcox362b7072008-07-22 12:37:17 -0600113 return device;
Alex Chiang8344b562008-06-10 15:30:42 -0600114}
115
116struct callback_args {
117 acpi_walk_callback user_function; /* only for walk_p2p_bridge */
118 struct pci_bus *pci_bus;
119 acpi_handle root_handle;
120};
121
122/*
123 * register_slot
124 *
125 * Called once for each SxFy object in the namespace. Don't worry about
126 * calling pci_create_slot multiple times for the same pci_bus:device,
127 * since each subsequent call simply bumps the refcount on the pci_slot.
128 *
129 * The number of calls to pci_destroy_slot from unregister_slot is
130 * symmetrical.
131 */
132static acpi_status
133register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
134{
135 int device;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400136 unsigned long long sun;
Alex Chiang8344b562008-06-10 15:30:42 -0600137 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
Matthew Wilcox362b7072008-07-22 12:37:17 -0600143 device = check_slot(handle, &sun);
144 if (device < 0)
Alex Chiang8344b562008-06-10 15:30:42 -0600145 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
Alex Chiang7e24bc12009-08-04 14:44:17 -0600153 snprintf(name, sizeof(name), "%llu", sun);
Alex Chiang828f3762008-10-20 17:40:52 -0600154 pci_slot = pci_create_slot(pci_bus, device, name, NULL);
Alex Chiang8344b562008-06-10 15:30:42 -0600155 if (IS_ERR(pci_slot)) {
156 err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
157 kfree(slot);
Alex Chiange4268aa2008-07-17 11:13:32 -0600158 return AE_OK;
Alex Chiang8344b562008-06-10 15:30:42 -0600159 }
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
Alex Chiang72800362009-03-30 10:50:19 -0600168 get_device(&pci_bus->dev);
169
Alex Chiang8344b562008-06-10 15:30:42 -0600170 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 * walk_p2p_bridge - discover and walk p2p bridges
178 * @handle: points to an acpi_pci_root
179 * @context: p2p_bridge_context pointer
180 *
181 * Note that when we call ourselves recursively, we pass a different
182 * value of pci_bus in the child_context.
183 */
184static acpi_status
185walk_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
186{
187 int device, function;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400188 unsigned long long adr;
Alex Chiang8344b562008-06-10 15:30:42 -0600189 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,
Lin Ming22635762009-11-13 10:06:08 +0800222 user_function, NULL, &child_context, NULL);
Alex Chiang8344b562008-06-10 15:30:42 -0600223 if (ACPI_FAILURE(status))
224 goto out;
225
226 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
Lin Ming22635762009-11-13 10:06:08 +0800227 walk_p2p_bridge, NULL, &child_context, NULL);
Alex Chiang8344b562008-06-10 15:30:42 -0600228out:
229 pci_dev_put(dev);
230 return AE_OK;
231}
232
233/*
234 * walk_root_bridge - generic root bridge walker
235 * @handle: points to an acpi_pci_root
236 * @user_function: user callback for slot objects
237 *
238 * Call user_function for all objects underneath this root bridge.
239 * Walk p2p bridges underneath us and call user_function on those too.
240 */
241static int
242walk_root_bridge(acpi_handle handle, acpi_walk_callback user_function)
243{
244 int seg, bus;
Matthew Wilcox27663c52008-10-10 02:22:59 -0400245 unsigned long long tmp;
Alex Chiang8344b562008-06-10 15:30:42 -0600246 acpi_status status;
247 acpi_handle dummy_handle;
248 struct pci_bus *pci_bus;
249 struct callback_args context;
250
251 /* If the bridge doesn't have _STA, we assume it is always there */
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 /* don't register this object */
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,
Lin Ming22635762009-11-13 10:06:08 +0800280 user_function, NULL, &context, NULL);
Alex Chiang8344b562008-06-10 15:30:42 -0600281 if (ACPI_FAILURE(status))
282 return status;
283
284 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
Lin Ming22635762009-11-13 10:06:08 +0800285 walk_p2p_bridge, NULL, &context, NULL);
Alex Chiang8344b562008-06-10 15:30:42 -0600286 if (ACPI_FAILURE(status))
287 err("%s: walk_p2p_bridge failure - %d\n", __func__, status);
288
289 return status;
290}
291
292/*
293 * acpi_pci_slot_add
294 * @handle: points to an acpi_pci_root
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 * acpi_pci_slot_remove
310 * @handle: points to an acpi_pci_root
311 */
312static void
313acpi_pci_slot_remove(acpi_handle handle)
314{
315 struct acpi_pci_slot *slot, *tmp;
Alex Chiang72800362009-03-30 10:50:19 -0600316 struct pci_bus *pbus;
Alex Chiang8344b562008-06-10 15:30:42 -0600317
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);
Alex Chiang72800362009-03-30 10:50:19 -0600322 pbus = slot->pci_slot->bus;
Alex Chiang8344b562008-06-10 15:30:42 -0600323 pci_destroy_slot(slot->pci_slot);
Alex Chiang72800362009-03-30 10:50:19 -0600324 put_device(&pbus->dev);
Alex Chiang8344b562008-06-10 15:30:42 -0600325 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 * Fujitsu Primequest machines will return 1023 to indicate an
341 * error if the _SUN method is evaluated on SxFy objects that
342 * are not present (as indicated by _STA), so for those machines,
343 * we want to check _STA before evaluating _SUN.
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);