ia64/linux-2.6.18-xen.hg

view drivers/acpi/pci_root.c @ 768:fad85221407b

Expose HID, UID, SEG, BBN of PCI root bridge via sysfs.

Signed-off-by: Yuji Shimada <shimada-yxb@necst.nec.co.jp>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Jan 05 10:53:06 2009 +0000 (2009-01-05)
parents 831230e53067
children 2fdc121e9b5d
line source
1 /*
2 * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/proc_fs.h>
31 #include <linux/spinlock.h>
32 #include <linux/pm.h>
33 #include <linux/pci.h>
34 #include <linux/acpi.h>
35 #include <acpi/acpi_bus.h>
36 #include <acpi/acpi_drivers.h>
38 #define _COMPONENT ACPI_PCI_COMPONENT
39 ACPI_MODULE_NAME("pci_root")
40 #define ACPI_PCI_ROOT_CLASS "pci_bridge"
41 #define ACPI_PCI_ROOT_HID "PNP0A03"
42 #define ACPI_PCI_ROOT_DRIVER_NAME "ACPI PCI Root Bridge Driver"
43 #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
44 static int acpi_pci_root_add(struct acpi_device *device);
45 static int acpi_pci_root_remove(struct acpi_device *device, int type);
46 static int acpi_pci_root_start(struct acpi_device *device);
48 static struct acpi_driver acpi_pci_root_driver = {
49 .name = ACPI_PCI_ROOT_DRIVER_NAME,
50 .class = ACPI_PCI_ROOT_CLASS,
51 .ids = ACPI_PCI_ROOT_HID,
52 .ops = {
53 .add = acpi_pci_root_add,
54 .remove = acpi_pci_root_remove,
55 .start = acpi_pci_root_start,
56 },
57 };
59 struct acpi_pci_root {
60 struct list_head node;
61 struct acpi_device * device;
62 struct acpi_pci_id id;
63 struct pci_bus *bus;
64 };
66 static LIST_HEAD(acpi_pci_roots);
68 static struct acpi_pci_driver *sub_driver;
70 int acpi_pci_register_driver(struct acpi_pci_driver *driver)
71 {
72 int n = 0;
73 struct list_head *entry;
75 struct acpi_pci_driver **pptr = &sub_driver;
76 while (*pptr)
77 pptr = &(*pptr)->next;
78 *pptr = driver;
80 if (!driver->add)
81 return 0;
83 list_for_each(entry, &acpi_pci_roots) {
84 struct acpi_pci_root *root;
85 root = list_entry(entry, struct acpi_pci_root, node);
86 driver->add(root->device->handle);
87 n++;
88 }
90 return n;
91 }
93 EXPORT_SYMBOL(acpi_pci_register_driver);
95 void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
96 {
97 struct list_head *entry;
99 struct acpi_pci_driver **pptr = &sub_driver;
100 while (*pptr) {
101 if (*pptr != driver)
102 continue;
103 *pptr = (*pptr)->next;
104 break;
105 }
107 if (!driver->remove)
108 return;
110 list_for_each(entry, &acpi_pci_roots) {
111 struct acpi_pci_root *root;
112 root = list_entry(entry, struct acpi_pci_root, node);
113 driver->remove(root->device->handle);
114 }
115 }
117 EXPORT_SYMBOL(acpi_pci_unregister_driver);
119 static acpi_status
120 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
121 {
122 int *busnr = (int *)data;
123 struct acpi_resource_address64 address;
125 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
126 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
127 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
128 return AE_OK;
130 acpi_resource_to_address64(resource, &address);
131 if ((address.address_length > 0) &&
132 (address.resource_type == ACPI_BUS_NUMBER_RANGE))
133 *busnr = address.minimum;
135 return AE_OK;
136 }
138 static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
139 {
140 acpi_status status;
142 *busnum = -1;
143 status =
144 acpi_walk_resources(handle, METHOD_NAME__CRS,
145 get_root_bridge_busnr_callback, busnum);
146 if (ACPI_FAILURE(status))
147 return status;
148 /* Check if we really get a bus number from _CRS */
149 if (*busnum == -1)
150 return AE_ERROR;
151 return AE_OK;
152 }
154 ssize_t
155 acpi_device_seg_show(struct acpi_device *acpi_dev, char *buf)
156 {
157 struct list_head *entry;
159 list_for_each(entry, &acpi_pci_roots) {
160 struct acpi_pci_root *root;
161 root = list_entry(entry, struct acpi_pci_root, node);
162 if (root->device == acpi_dev)
163 return sprintf(buf, "%04x\n", root->id.segment);
164 }
165 return 0;
166 }
167 ACPI_DEVICE_ATTR(seg, 0444, acpi_device_seg_show, NULL);
169 ssize_t
170 acpi_device_bbn_show(struct acpi_device *acpi_dev, char *buf)
171 {
172 struct list_head *entry;
174 list_for_each(entry, &acpi_pci_roots) {
175 struct acpi_pci_root *root;
176 root = list_entry(entry, struct acpi_pci_root, node);
177 if (root->device == acpi_dev)
178 return sprintf(buf, "%02x\n", root->id.bus);
179 }
180 return 0;
181 }
182 ACPI_DEVICE_ATTR(bbn, 0444, acpi_device_bbn_show, NULL);
184 static int acpi_pci_root_add(struct acpi_device *device)
185 {
186 int result = 0;
187 struct acpi_pci_root *root = NULL;
188 struct acpi_pci_root *tmp;
189 acpi_status status = AE_OK;
190 unsigned long value = 0;
191 acpi_handle handle = NULL;
194 if (!device)
195 return -EINVAL;
197 root = kmalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
198 if (!root)
199 return -ENOMEM;
200 memset(root, 0, sizeof(struct acpi_pci_root));
201 INIT_LIST_HEAD(&root->node);
203 root->device = device;
204 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
205 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
206 acpi_driver_data(device) = root;
208 /*
209 * TBD: Doesn't the bus driver automatically set this?
210 */
211 device->ops.bind = acpi_pci_bind;
213 /*
214 * Segment
215 * -------
216 * Obtained via _SEG, if exists, otherwise assumed to be zero (0).
217 */
218 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
219 &value);
220 switch (status) {
221 case AE_OK:
222 root->id.segment = (u16) value;
223 break;
224 case AE_NOT_FOUND:
225 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
226 "Assuming segment 0 (no _SEG)\n"));
227 root->id.segment = 0;
228 break;
229 default:
230 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SEG"));
231 result = -ENODEV;
232 goto end;
233 }
235 /*
236 * Bus
237 * ---
238 * Obtained via _BBN, if exists, otherwise assumed to be zero (0).
239 */
240 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL,
241 &value);
242 switch (status) {
243 case AE_OK:
244 root->id.bus = (u16) value;
245 break;
246 case AE_NOT_FOUND:
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Assuming bus 0 (no _BBN)\n"));
248 root->id.bus = 0;
249 break;
250 default:
251 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BBN"));
252 result = -ENODEV;
253 goto end;
254 }
256 /* Some systems have wrong _BBN */
257 list_for_each_entry(tmp, &acpi_pci_roots, node) {
258 if ((tmp->id.segment == root->id.segment)
259 && (tmp->id.bus == root->id.bus)) {
260 int bus = 0;
261 acpi_status status;
263 printk(KERN_ERR PREFIX
264 "Wrong _BBN value, reboot"
265 " and use option 'pci=noacpi'\n");
267 status = try_get_root_bridge_busnr(device->handle, &bus);
268 if (ACPI_FAILURE(status))
269 break;
270 if (bus != root->id.bus) {
271 printk(KERN_INFO PREFIX
272 "PCI _CRS %d overrides _BBN 0\n", bus);
273 root->id.bus = bus;
274 }
275 break;
276 }
277 }
278 /*
279 * Device & Function
280 * -----------------
281 * Obtained from _ADR (which has already been evaluated for us).
282 */
283 root->id.device = device->pnp.bus_address >> 16;
284 root->id.function = device->pnp.bus_address & 0xFFFF;
286 /*
287 * TBD: Need PCI interface for enumeration/configuration of roots.
288 */
290 /* TBD: Locking */
291 list_add_tail(&root->node, &acpi_pci_roots);
293 printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n",
294 acpi_device_name(device), acpi_device_bid(device),
295 root->id.segment, root->id.bus);
297 /*
298 * Scan the Root Bridge
299 * --------------------
300 * Must do this prior to any attempt to bind the root device, as the
301 * PCI namespace does not get created until this call is made (and
302 * thus the root bridge's pci_dev does not exist).
303 */
304 root->bus = pci_acpi_scan_root(device, root->id.segment, root->id.bus);
305 if (!root->bus) {
306 printk(KERN_ERR PREFIX
307 "Bus %04x:%02x not present in PCI namespace\n",
308 root->id.segment, root->id.bus);
309 result = -ENODEV;
310 goto end;
311 }
313 /*
314 * Attach ACPI-PCI Context
315 * -----------------------
316 * Thus binding the ACPI and PCI devices.
317 */
318 result = acpi_pci_bind_root(device, &root->id, root->bus);
319 if (result)
320 goto end;
322 /*
323 * PCI Routing Table
324 * -----------------
325 * Evaluate and parse _PRT, if exists.
326 */
327 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
328 if (ACPI_SUCCESS(status))
329 result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
330 root->id.bus);
331 if (result)
332 goto end;
334 sysfs_create_file(&device->kobj, &acpi_device_attr_seg.attr);
336 sysfs_create_file(&device->kobj, &acpi_device_attr_bbn.attr);
338 end:
339 if (result) {
340 if (!list_empty(&root->node))
341 list_del(&root->node);
342 kfree(root);
343 }
345 return result;
346 }
348 static int acpi_pci_root_start(struct acpi_device *device)
349 {
350 struct acpi_pci_root *root;
353 list_for_each_entry(root, &acpi_pci_roots, node) {
354 if (root->device == device) {
355 pci_bus_add_devices(root->bus);
356 return 0;
357 }
358 }
359 return -ENODEV;
360 }
362 static int acpi_pci_root_remove(struct acpi_device *device, int type)
363 {
364 struct acpi_pci_root *root = NULL;
367 if (!device || !acpi_driver_data(device))
368 return -EINVAL;
370 root = (struct acpi_pci_root *)acpi_driver_data(device);
372 kfree(root);
374 return 0;
375 }
377 static int __init acpi_pci_root_init(void)
378 {
380 if (acpi_pci_disabled)
381 return 0;
383 /* DEBUG:
384 acpi_dbg_layer = ACPI_PCI_COMPONENT;
385 acpi_dbg_level = 0xFFFFFFFF;
386 */
388 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
389 return -ENODEV;
391 return 0;
392 }
394 subsys_initcall(acpi_pci_root_init);