ia64/linux-2.6.18-xen.hg

view drivers/acpi/pci_bind.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
1 /*
2 * pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
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_bind")
41 struct acpi_pci_data {
42 struct acpi_pci_id id;
43 struct pci_bus *bus;
44 struct pci_dev *dev;
45 };
47 static void acpi_pci_data_handler(acpi_handle handle, u32 function,
48 void *context)
49 {
51 /* TBD: Anything we need to do here? */
53 return;
54 }
56 /**
57 * acpi_get_pci_id
58 * ------------------
59 * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
60 * to resolve PCI information for ACPI-PCI devices defined in the namespace.
61 * This typically occurs when resolving PCI operation region information.
62 */
63 acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
64 {
65 int result = 0;
66 acpi_status status = AE_OK;
67 struct acpi_device *device = NULL;
68 struct acpi_pci_data *data = NULL;
71 if (!id)
72 return AE_BAD_PARAMETER;
74 result = acpi_bus_get_device(handle, &device);
75 if (result) {
76 printk(KERN_ERR PREFIX
77 "Invalid ACPI Bus context for device %s\n",
78 acpi_device_bid(device));
79 return AE_NOT_EXIST;
80 }
82 status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
83 if (ACPI_FAILURE(status) || !data) {
84 ACPI_EXCEPTION((AE_INFO, status,
85 "Invalid ACPI-PCI context for device %s",
86 acpi_device_bid(device)));
87 return status;
88 }
90 *id = data->id;
92 /*
93 id->segment = data->id.segment;
94 id->bus = data->id.bus;
95 id->device = data->id.device;
96 id->function = data->id.function;
97 */
99 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
100 "Device %s has PCI address %02x:%02x:%02x.%02x\n",
101 acpi_device_bid(device), id->segment, id->bus,
102 id->device, id->function));
104 return AE_OK;
105 }
107 EXPORT_SYMBOL(acpi_get_pci_id);
109 int acpi_pci_bind(struct acpi_device *device)
110 {
111 int result = 0;
112 acpi_status status = AE_OK;
113 struct acpi_pci_data *data = NULL;
114 struct acpi_pci_data *pdata = NULL;
115 char *pathname = NULL;
116 struct acpi_buffer buffer = { 0, NULL };
117 acpi_handle handle = NULL;
118 struct pci_dev *dev;
119 struct pci_bus *bus;
122 if (!device || !device->parent)
123 return -EINVAL;
125 pathname = kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
126 if (!pathname)
127 return -ENOMEM;
128 memset(pathname, 0, ACPI_PATHNAME_MAX);
129 buffer.length = ACPI_PATHNAME_MAX;
130 buffer.pointer = pathname;
132 data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
133 if (!data) {
134 kfree(pathname);
135 return -ENOMEM;
136 }
137 memset(data, 0, sizeof(struct acpi_pci_data));
139 acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
140 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
141 pathname));
143 /*
144 * Segment & Bus
145 * -------------
146 * These are obtained via the parent device's ACPI-PCI context.
147 */
148 status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
149 (void **)&pdata);
150 if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
151 ACPI_EXCEPTION((AE_INFO, status,
152 "Invalid ACPI-PCI context for parent device %s",
153 acpi_device_bid(device->parent)));
154 result = -ENODEV;
155 goto end;
156 }
157 data->id.segment = pdata->id.segment;
158 data->id.bus = pdata->bus->number;
160 /*
161 * Device & Function
162 * -----------------
163 * These are simply obtained from the device's _ADR method. Note
164 * that a value of zero is valid.
165 */
166 data->id.device = device->pnp.bus_address >> 16;
167 data->id.function = device->pnp.bus_address & 0xFFFF;
169 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
170 data->id.segment, data->id.bus, data->id.device,
171 data->id.function));
173 /*
174 * TBD: Support slot devices (e.g. function=0xFFFF).
175 */
177 /*
178 * Locate PCI Device
179 * -----------------
180 * Locate matching device in PCI namespace. If it doesn't exist
181 * this typically means that the device isn't currently inserted
182 * (e.g. docking station, port replicator, etc.).
183 * We cannot simply search the global pci device list, since
184 * PCI devices are added to the global pci list when the root
185 * bridge start ops are run, which may not have happened yet.
186 */
187 bus = pci_find_bus(data->id.segment, data->id.bus);
188 if (bus) {
189 list_for_each_entry(dev, &bus->devices, bus_list) {
190 if (dev->devfn == PCI_DEVFN(data->id.device,
191 data->id.function)) {
192 data->dev = dev;
193 break;
194 }
195 }
196 }
197 if (!data->dev) {
198 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
199 "Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
200 data->id.segment, data->id.bus,
201 data->id.device, data->id.function));
202 result = -ENODEV;
203 goto end;
204 }
205 if (!data->dev->bus) {
206 printk(KERN_ERR PREFIX
207 "Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
208 data->id.segment, data->id.bus,
209 data->id.device, data->id.function);
210 result = -ENODEV;
211 goto end;
212 }
214 /*
215 * PCI Bridge?
216 * -----------
217 * If so, set the 'bus' field and install the 'bind' function to
218 * facilitate callbacks for all of its children.
219 */
220 if (data->dev->subordinate) {
221 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
222 "Device %02x:%02x:%02x.%02x is a PCI bridge\n",
223 data->id.segment, data->id.bus,
224 data->id.device, data->id.function));
225 data->bus = data->dev->subordinate;
226 device->ops.bind = acpi_pci_bind;
227 device->ops.unbind = acpi_pci_unbind;
228 }
230 /*
231 * Attach ACPI-PCI Context
232 * -----------------------
233 * Thus binding the ACPI and PCI devices.
234 */
235 status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
236 if (ACPI_FAILURE(status)) {
237 ACPI_EXCEPTION((AE_INFO, status,
238 "Unable to attach ACPI-PCI context to device %s",
239 acpi_device_bid(device)));
240 result = -ENODEV;
241 goto end;
242 }
244 /*
245 * PCI Routing Table
246 * -----------------
247 * Evaluate and parse _PRT, if exists. This code is independent of
248 * PCI bridges (above) to allow parsing of _PRT objects within the
249 * scope of non-bridge devices. Note that _PRTs within the scope of
250 * a PCI bridge assume the bridge's subordinate bus number.
251 *
252 * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
253 */
254 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
255 if (ACPI_SUCCESS(status)) {
256 if (data->bus) /* PCI-PCI bridge */
257 acpi_pci_irq_add_prt(device->handle, data->id.segment,
258 data->bus->number);
259 else /* non-bridge PCI device */
260 acpi_pci_irq_add_prt(device->handle, data->id.segment,
261 data->id.bus);
262 }
264 end:
265 kfree(pathname);
266 if (result)
267 kfree(data);
269 return result;
270 }
272 int acpi_pci_unbind(struct acpi_device *device)
273 {
274 int result = 0;
275 acpi_status status = AE_OK;
276 struct acpi_pci_data *data = NULL;
277 char *pathname = NULL;
278 struct acpi_buffer buffer = { 0, NULL };
281 if (!device || !device->parent)
282 return -EINVAL;
284 pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
285 if (!pathname)
286 return -ENOMEM;
287 memset(pathname, 0, ACPI_PATHNAME_MAX);
289 buffer.length = ACPI_PATHNAME_MAX;
290 buffer.pointer = pathname;
291 acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
293 pathname));
294 kfree(pathname);
296 status =
297 acpi_get_data(device->handle, acpi_pci_data_handler,
298 (void **)&data);
299 if (ACPI_FAILURE(status)) {
300 ACPI_EXCEPTION((AE_INFO, status,
301 "Unable to get data from device %s",
302 acpi_device_bid(device)));
303 result = -ENODEV;
304 goto end;
305 }
307 status = acpi_detach_data(device->handle, acpi_pci_data_handler);
308 if (ACPI_FAILURE(status)) {
309 ACPI_EXCEPTION((AE_INFO, status,
310 "Unable to detach data from device %s",
311 acpi_device_bid(device)));
312 result = -ENODEV;
313 goto end;
314 }
315 if (data->dev->subordinate) {
316 acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
317 }
318 kfree(data);
320 end:
321 return result;
322 }
324 int
325 acpi_pci_bind_root(struct acpi_device *device,
326 struct acpi_pci_id *id, struct pci_bus *bus)
327 {
328 int result = 0;
329 acpi_status status = AE_OK;
330 struct acpi_pci_data *data = NULL;
331 char *pathname = NULL;
332 struct acpi_buffer buffer = { 0, NULL };
335 pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
336 if (!pathname)
337 return -ENOMEM;
338 memset(pathname, 0, ACPI_PATHNAME_MAX);
340 buffer.length = ACPI_PATHNAME_MAX;
341 buffer.pointer = pathname;
343 if (!device || !id || !bus) {
344 kfree(pathname);
345 return -EINVAL;
346 }
348 data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
349 if (!data) {
350 kfree(pathname);
351 return -ENOMEM;
352 }
353 memset(data, 0, sizeof(struct acpi_pci_data));
355 data->id = *id;
356 data->bus = bus;
357 device->ops.bind = acpi_pci_bind;
358 device->ops.unbind = acpi_pci_unbind;
360 acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
362 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
363 "%02x:%02x\n", pathname, id->segment, id->bus));
365 status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
366 if (ACPI_FAILURE(status)) {
367 ACPI_EXCEPTION((AE_INFO, status,
368 "Unable to attach ACPI-PCI context to device %s",
369 pathname));
370 result = -ENODEV;
371 goto end;
372 }
374 end:
375 kfree(pathname);
376 if (result != 0)
377 kfree(data);
379 return result;
380 }