Commit | Line | Data |
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1da177e4 | 1 | /* |
783c49fc | 2 | * Common ACPI functions for hot plug platforms |
1da177e4 | 3 | * |
783c49fc | 4 | * Copyright (C) 2006 Intel Corporation |
1da177e4 LT |
5 | * |
6 | * All rights reserved. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or (at | |
11 | * your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
16 | * NON INFRINGEMENT. See the GNU General Public License for more | |
17 | * details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | * | |
8cf4c195 | 23 | * Send feedback to <kristen.c.accardi@intel.com> |
1da177e4 LT |
24 | * |
25 | */ | |
26 | ||
1da177e4 | 27 | #include <linux/module.h> |
aad20cab | 28 | #include <linux/moduleparam.h> |
1da177e4 LT |
29 | #include <linux/kernel.h> |
30 | #include <linux/types.h> | |
31 | #include <linux/pci.h> | |
7a54f25c | 32 | #include <linux/pci_hotplug.h> |
9f5404d8 | 33 | #include <linux/acpi.h> |
ac9c052d | 34 | #include <linux/pci-acpi.h> |
1da177e4 | 35 | |
aad20cab KK |
36 | #define MY_NAME "acpi_pcihp" |
37 | ||
66bef8c0 | 38 | #define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0) |
aad20cab KK |
39 | #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg) |
40 | #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg) | |
41 | #define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg) | |
42 | ||
1da177e4 LT |
43 | #define METHOD_NAME__SUN "_SUN" |
44 | #define METHOD_NAME__HPP "_HPP" | |
45 | #define METHOD_NAME_OSHP "OSHP" | |
46 | ||
aad20cab KK |
47 | static int debug_acpi; |
48 | ||
e22b7350 KK |
49 | static acpi_status |
50 | decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx) | |
51 | { | |
52 | int i; | |
53 | union acpi_object *fields = record->package.elements; | |
54 | u32 revision = fields[1].integer.value; | |
55 | ||
56 | switch (revision) { | |
57 | case 1: | |
58 | if (record->package.count != 6) | |
59 | return AE_ERROR; | |
60 | for (i = 2; i < 6; i++) | |
61 | if (fields[i].type != ACPI_TYPE_INTEGER) | |
62 | return AE_ERROR; | |
63 | hpx->t0 = &hpx->type0_data; | |
64 | hpx->t0->revision = revision; | |
65 | hpx->t0->cache_line_size = fields[2].integer.value; | |
66 | hpx->t0->latency_timer = fields[3].integer.value; | |
67 | hpx->t0->enable_serr = fields[4].integer.value; | |
68 | hpx->t0->enable_perr = fields[5].integer.value; | |
69 | break; | |
70 | default: | |
71 | printk(KERN_WARNING | |
72 | "%s: Type 0 Revision %d record not supported\n", | |
66bef8c0 | 73 | __func__, revision); |
e22b7350 KK |
74 | return AE_ERROR; |
75 | } | |
76 | return AE_OK; | |
77 | } | |
78 | ||
79 | static acpi_status | |
80 | decode_type1_hpx_record(union acpi_object *record, struct hotplug_params *hpx) | |
81 | { | |
82 | int i; | |
83 | union acpi_object *fields = record->package.elements; | |
84 | u32 revision = fields[1].integer.value; | |
85 | ||
86 | switch (revision) { | |
87 | case 1: | |
88 | if (record->package.count != 5) | |
89 | return AE_ERROR; | |
90 | for (i = 2; i < 5; i++) | |
91 | if (fields[i].type != ACPI_TYPE_INTEGER) | |
92 | return AE_ERROR; | |
93 | hpx->t1 = &hpx->type1_data; | |
94 | hpx->t1->revision = revision; | |
95 | hpx->t1->max_mem_read = fields[2].integer.value; | |
96 | hpx->t1->avg_max_split = fields[3].integer.value; | |
97 | hpx->t1->tot_max_split = fields[4].integer.value; | |
98 | break; | |
99 | default: | |
100 | printk(KERN_WARNING | |
101 | "%s: Type 1 Revision %d record not supported\n", | |
66bef8c0 | 102 | __func__, revision); |
e22b7350 KK |
103 | return AE_ERROR; |
104 | } | |
105 | return AE_OK; | |
106 | } | |
107 | ||
108 | static acpi_status | |
109 | decode_type2_hpx_record(union acpi_object *record, struct hotplug_params *hpx) | |
110 | { | |
111 | int i; | |
112 | union acpi_object *fields = record->package.elements; | |
113 | u32 revision = fields[1].integer.value; | |
114 | ||
115 | switch (revision) { | |
116 | case 1: | |
117 | if (record->package.count != 18) | |
118 | return AE_ERROR; | |
119 | for (i = 2; i < 18; i++) | |
120 | if (fields[i].type != ACPI_TYPE_INTEGER) | |
121 | return AE_ERROR; | |
122 | hpx->t2 = &hpx->type2_data; | |
123 | hpx->t2->revision = revision; | |
124 | hpx->t2->unc_err_mask_and = fields[2].integer.value; | |
125 | hpx->t2->unc_err_mask_or = fields[3].integer.value; | |
126 | hpx->t2->unc_err_sever_and = fields[4].integer.value; | |
127 | hpx->t2->unc_err_sever_or = fields[5].integer.value; | |
128 | hpx->t2->cor_err_mask_and = fields[6].integer.value; | |
129 | hpx->t2->cor_err_mask_or = fields[7].integer.value; | |
130 | hpx->t2->adv_err_cap_and = fields[8].integer.value; | |
131 | hpx->t2->adv_err_cap_or = fields[9].integer.value; | |
132 | hpx->t2->pci_exp_devctl_and = fields[10].integer.value; | |
133 | hpx->t2->pci_exp_devctl_or = fields[11].integer.value; | |
134 | hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value; | |
135 | hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value; | |
136 | hpx->t2->sec_unc_err_sever_and = fields[14].integer.value; | |
137 | hpx->t2->sec_unc_err_sever_or = fields[15].integer.value; | |
138 | hpx->t2->sec_unc_err_mask_and = fields[16].integer.value; | |
139 | hpx->t2->sec_unc_err_mask_or = fields[17].integer.value; | |
140 | break; | |
141 | default: | |
142 | printk(KERN_WARNING | |
143 | "%s: Type 2 Revision %d record not supported\n", | |
66bef8c0 | 144 | __func__, revision); |
e22b7350 KK |
145 | return AE_ERROR; |
146 | } | |
147 | return AE_OK; | |
148 | } | |
149 | ||
150 | static acpi_status | |
151 | acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx) | |
152 | { | |
153 | acpi_status status; | |
154 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
155 | union acpi_object *package, *record, *fields; | |
156 | u32 type; | |
157 | int i; | |
158 | ||
159 | /* Clear the return buffer with zeros */ | |
160 | memset(hpx, 0, sizeof(struct hotplug_params)); | |
161 | ||
162 | status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer); | |
163 | if (ACPI_FAILURE(status)) | |
164 | return status; | |
165 | ||
166 | package = (union acpi_object *)buffer.pointer; | |
167 | if (package->type != ACPI_TYPE_PACKAGE) { | |
168 | status = AE_ERROR; | |
169 | goto exit; | |
170 | } | |
171 | ||
172 | for (i = 0; i < package->package.count; i++) { | |
173 | record = &package->package.elements[i]; | |
174 | if (record->type != ACPI_TYPE_PACKAGE) { | |
175 | status = AE_ERROR; | |
176 | goto exit; | |
177 | } | |
178 | ||
179 | fields = record->package.elements; | |
180 | if (fields[0].type != ACPI_TYPE_INTEGER || | |
181 | fields[1].type != ACPI_TYPE_INTEGER) { | |
182 | status = AE_ERROR; | |
183 | goto exit; | |
184 | } | |
185 | ||
186 | type = fields[0].integer.value; | |
187 | switch (type) { | |
188 | case 0: | |
189 | status = decode_type0_hpx_record(record, hpx); | |
190 | if (ACPI_FAILURE(status)) | |
191 | goto exit; | |
192 | break; | |
193 | case 1: | |
194 | status = decode_type1_hpx_record(record, hpx); | |
195 | if (ACPI_FAILURE(status)) | |
196 | goto exit; | |
197 | break; | |
198 | case 2: | |
199 | status = decode_type2_hpx_record(record, hpx); | |
200 | if (ACPI_FAILURE(status)) | |
201 | goto exit; | |
202 | break; | |
203 | default: | |
204 | printk(KERN_ERR "%s: Type %d record not supported\n", | |
66bef8c0 | 205 | __func__, type); |
e22b7350 KK |
206 | status = AE_ERROR; |
207 | goto exit; | |
208 | } | |
209 | } | |
210 | exit: | |
211 | kfree(buffer.pointer); | |
212 | return status; | |
213 | } | |
1da177e4 | 214 | |
a8a2be94 | 215 | static acpi_status |
216 | acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp) | |
1da177e4 LT |
217 | { |
218 | acpi_status status; | |
219 | u8 nui[4]; | |
220 | struct acpi_buffer ret_buf = { 0, NULL}; | |
b2e6e3ba | 221 | struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 222 | union acpi_object *ext_obj, *package; |
1da177e4 LT |
223 | int i, len = 0; |
224 | ||
b2e6e3ba MT |
225 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); |
226 | ||
e22b7350 KK |
227 | /* Clear the return buffer with zeros */ |
228 | memset(hpp, 0, sizeof(struct hotplug_params)); | |
229 | ||
1da177e4 | 230 | /* get _hpp */ |
a8a2be94 | 231 | status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf); |
1da177e4 LT |
232 | switch (status) { |
233 | case AE_BUFFER_OVERFLOW: | |
234 | ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL); | |
235 | if (!ret_buf.pointer) { | |
783c49fc | 236 | printk(KERN_ERR "%s:%s alloc for _HPP fail\n", |
66bef8c0 | 237 | __func__, (char *)string.pointer); |
81b26bca | 238 | kfree(string.pointer); |
a8a2be94 | 239 | return AE_NO_MEMORY; |
1da177e4 | 240 | } |
a8a2be94 | 241 | status = acpi_evaluate_object(handle, METHOD_NAME__HPP, |
242 | NULL, &ret_buf); | |
1da177e4 LT |
243 | if (ACPI_SUCCESS(status)) |
244 | break; | |
245 | default: | |
246 | if (ACPI_FAILURE(status)) { | |
66bef8c0 | 247 | pr_debug("%s:%s _HPP fail=0x%x\n", __func__, |
b2e6e3ba | 248 | (char *)string.pointer, status); |
81b26bca | 249 | kfree(string.pointer); |
a8a2be94 | 250 | return status; |
1da177e4 LT |
251 | } |
252 | } | |
253 | ||
254 | ext_obj = (union acpi_object *) ret_buf.pointer; | |
255 | if (ext_obj->type != ACPI_TYPE_PACKAGE) { | |
66bef8c0 | 256 | printk(KERN_ERR "%s:%s _HPP obj not a package\n", __func__, |
b2e6e3ba | 257 | (char *)string.pointer); |
a8a2be94 | 258 | status = AE_ERROR; |
1da177e4 LT |
259 | goto free_and_return; |
260 | } | |
261 | ||
262 | len = ext_obj->package.count; | |
263 | package = (union acpi_object *) ret_buf.pointer; | |
264 | for ( i = 0; (i < len) || (i < 4); i++) { | |
265 | ext_obj = (union acpi_object *) &package->package.elements[i]; | |
266 | switch (ext_obj->type) { | |
267 | case ACPI_TYPE_INTEGER: | |
268 | nui[i] = (u8)ext_obj->integer.value; | |
269 | break; | |
270 | default: | |
783c49fc | 271 | printk(KERN_ERR "%s:%s _HPP obj type incorrect\n", |
66bef8c0 | 272 | __func__, (char *)string.pointer); |
a8a2be94 | 273 | status = AE_ERROR; |
1da177e4 LT |
274 | goto free_and_return; |
275 | } | |
276 | } | |
277 | ||
e22b7350 KK |
278 | hpp->t0 = &hpp->type0_data; |
279 | hpp->t0->cache_line_size = nui[0]; | |
280 | hpp->t0->latency_timer = nui[1]; | |
281 | hpp->t0->enable_serr = nui[2]; | |
282 | hpp->t0->enable_perr = nui[3]; | |
1da177e4 | 283 | |
e22b7350 KK |
284 | pr_debug(" _HPP: cache_line_size=0x%x\n", hpp->t0->cache_line_size); |
285 | pr_debug(" _HPP: latency timer =0x%x\n", hpp->t0->latency_timer); | |
286 | pr_debug(" _HPP: enable SERR =0x%x\n", hpp->t0->enable_serr); | |
287 | pr_debug(" _HPP: enable PERR =0x%x\n", hpp->t0->enable_perr); | |
1da177e4 LT |
288 | |
289 | free_and_return: | |
81b26bca KA |
290 | kfree(string.pointer); |
291 | kfree(ret_buf.pointer); | |
a8a2be94 | 292 | return status; |
1da177e4 LT |
293 | } |
294 | ||
783c49fc KA |
295 | |
296 | ||
297 | /* acpi_run_oshp - get control of hotplug from the firmware | |
298 | * | |
299 | * @handle - the handle of the hotplug controller. | |
300 | */ | |
ac9c052d | 301 | static acpi_status acpi_run_oshp(acpi_handle handle) |
1da177e4 LT |
302 | { |
303 | acpi_status status; | |
b2e6e3ba MT |
304 | struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; |
305 | ||
306 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); | |
1da177e4 LT |
307 | |
308 | /* run OSHP */ | |
a8a2be94 | 309 | status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL); |
783c49fc | 310 | if (ACPI_FAILURE(status)) |
aad20cab KK |
311 | if (status != AE_NOT_FOUND) |
312 | printk(KERN_ERR "%s:%s OSHP fails=0x%x\n", | |
66bef8c0 | 313 | __func__, (char *)string.pointer, status); |
aad20cab KK |
314 | else |
315 | dbg("%s:%s OSHP not found\n", | |
66bef8c0 | 316 | __func__, (char *)string.pointer); |
783c49fc | 317 | else |
66bef8c0 | 318 | pr_debug("%s:%s OSHP passes\n", __func__, |
b2e6e3ba MT |
319 | (char *)string.pointer); |
320 | ||
81b26bca | 321 | kfree(string.pointer); |
783c49fc KA |
322 | return status; |
323 | } | |
783c49fc | 324 | |
e81995bb | 325 | /* pci_get_hp_params |
783c49fc | 326 | * |
6a29172b | 327 | * @dev - the pci_dev for which we want parameters |
783c49fc KA |
328 | * @hpp - allocated by the caller |
329 | */ | |
e81995bb | 330 | int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp) |
783c49fc | 331 | { |
6a29172b | 332 | acpi_status status; |
7430e34c | 333 | acpi_handle handle, phandle; |
267efd7e KK |
334 | struct pci_bus *pbus; |
335 | ||
336 | handle = NULL; | |
6a29172b | 337 | for (pbus = dev->bus; pbus; pbus = pbus->parent) { |
267efd7e KK |
338 | handle = acpi_pci_get_bridge_handle(pbus); |
339 | if (handle) | |
7430e34c | 340 | break; |
267efd7e | 341 | } |
783c49fc KA |
342 | |
343 | /* | |
344 | * _HPP settings apply to all child buses, until another _HPP is | |
345 | * encountered. If we don't find an _HPP for the input pci dev, | |
346 | * look for it in the parent device scope since that would apply to | |
e81995bb | 347 | * this pci dev. |
783c49fc | 348 | */ |
7430e34c | 349 | while (handle) { |
e22b7350 KK |
350 | status = acpi_run_hpx(handle, hpp); |
351 | if (ACPI_SUCCESS(status)) | |
6a29172b | 352 | return 0; |
783c49fc | 353 | status = acpi_run_hpp(handle, hpp); |
7430e34c | 354 | if (ACPI_SUCCESS(status)) |
6a29172b | 355 | return 0; |
27558203 | 356 | if (acpi_is_root_bridge(handle)) |
7430e34c KK |
357 | break; |
358 | status = acpi_get_parent(handle, &phandle); | |
359 | if (ACPI_FAILURE(status)) | |
783c49fc | 360 | break; |
7430e34c | 361 | handle = phandle; |
1da177e4 | 362 | } |
6a29172b | 363 | return -ENODEV; |
1da177e4 | 364 | } |
e81995bb | 365 | EXPORT_SYMBOL_GPL(pci_get_hp_params); |
783c49fc | 366 | |
ac9c052d KK |
367 | /** |
368 | * acpi_get_hp_hw_control_from_firmware | |
369 | * @dev: the pci_dev of the bridge that has a hotplug controller | |
370 | * @flags: requested control bits for _OSC | |
371 | * | |
372 | * Attempt to take hotplug control from firmware. | |
373 | */ | |
d391f00f | 374 | int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev, u32 flags) |
ac9c052d KK |
375 | { |
376 | acpi_status status; | |
e0d94bee | 377 | acpi_handle chandle, handle; |
ac9c052d KK |
378 | struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; |
379 | ||
380 | flags &= (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL | | |
381 | OSC_SHPC_NATIVE_HP_CONTROL | | |
382 | OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); | |
383 | if (!flags) { | |
384 | err("Invalid flags %u specified!\n", flags); | |
385 | return -EINVAL; | |
386 | } | |
387 | ||
388 | /* | |
389 | * Per PCI firmware specification, we should run the ACPI _OSC | |
390 | * method to get control of hotplug hardware before using it. If | |
391 | * an _OSC is missing, we look for an OSHP to do the same thing. | |
e0d94bee JS |
392 | * To handle different BIOS behavior, we look for _OSC on a root |
393 | * bridge preferentially (according to PCI fw spec). Later for | |
394 | * OSHP within the scope of the hotplug controller and its parents, | |
ac9c052d KK |
395 | * upto the host bridge under which this controller exists. |
396 | */ | |
056c58e8 | 397 | handle = acpi_find_root_bridge_handle(pdev); |
e0d94bee JS |
398 | if (handle) { |
399 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); | |
400 | dbg("Trying to get hotplug control for %s\n", | |
401 | (char *)string.pointer); | |
9f5404d8 | 402 | status = acpi_pci_osc_control_set(handle, flags); |
e0d94bee JS |
403 | if (ACPI_SUCCESS(status)) |
404 | goto got_one; | |
405 | kfree(string.pointer); | |
406 | string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL }; | |
407 | } | |
408 | ||
d391f00f KK |
409 | handle = DEVICE_ACPI_HANDLE(&pdev->dev); |
410 | if (!handle) { | |
ac9c052d KK |
411 | /* |
412 | * This hotplug controller was not listed in the ACPI name | |
413 | * space at all. Try to get acpi handle of parent pci bus. | |
414 | */ | |
d391f00f KK |
415 | struct pci_bus *pbus; |
416 | for (pbus = pdev->bus; pbus; pbus = pbus->parent) { | |
417 | handle = acpi_pci_get_bridge_handle(pbus); | |
418 | if (handle) | |
419 | break; | |
420 | } | |
ac9c052d KK |
421 | } |
422 | ||
423 | while (handle) { | |
424 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); | |
425 | dbg("Trying to get hotplug control for %s \n", | |
426 | (char *)string.pointer); | |
e0d94bee JS |
427 | status = acpi_run_oshp(handle); |
428 | if (ACPI_SUCCESS(status)) | |
429 | goto got_one; | |
27558203 | 430 | if (acpi_is_root_bridge(handle)) |
ac9c052d KK |
431 | break; |
432 | chandle = handle; | |
433 | status = acpi_get_parent(chandle, &handle); | |
434 | if (ACPI_FAILURE(status)) | |
435 | break; | |
436 | } | |
437 | ||
438 | dbg("Cannot get control of hotplug hardware for pci %s\n", | |
d391f00f | 439 | pci_name(pdev)); |
ac9c052d KK |
440 | |
441 | kfree(string.pointer); | |
442 | return -ENODEV; | |
e0d94bee | 443 | got_one: |
d391f00f KK |
444 | dbg("Gained control for hotplug HW for pci %s (%s)\n", |
445 | pci_name(pdev), (char *)string.pointer); | |
e0d94bee JS |
446 | kfree(string.pointer); |
447 | return 0; | |
ac9c052d KK |
448 | } |
449 | EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware); | |
1da177e4 | 450 | |
e8c331e9 KK |
451 | static int is_ejectable(acpi_handle handle) |
452 | { | |
453 | acpi_status status; | |
454 | acpi_handle tmp; | |
455 | unsigned long long removable; | |
456 | status = acpi_get_handle(handle, "_ADR", &tmp); | |
457 | if (ACPI_FAILURE(status)) | |
458 | return 0; | |
459 | status = acpi_get_handle(handle, "_EJ0", &tmp); | |
460 | if (ACPI_SUCCESS(status)) | |
461 | return 1; | |
462 | status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable); | |
463 | if (ACPI_SUCCESS(status) && removable) | |
464 | return 1; | |
465 | return 0; | |
466 | } | |
467 | ||
468 | /** | |
469 | * acpi_pcihp_check_ejectable - check if handle is ejectable ACPI PCI slot | |
470 | * @pbus: the PCI bus of the PCI slot corresponding to 'handle' | |
471 | * @handle: ACPI handle to check | |
472 | * | |
473 | * Return 1 if handle is ejectable PCI slot, 0 otherwise. | |
474 | */ | |
475 | int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle) | |
476 | { | |
477 | acpi_handle bridge_handle, parent_handle; | |
478 | ||
479 | if (!(bridge_handle = acpi_pci_get_bridge_handle(pbus))) | |
480 | return 0; | |
481 | if ((ACPI_FAILURE(acpi_get_parent(handle, &parent_handle)))) | |
482 | return 0; | |
483 | if (bridge_handle != parent_handle) | |
484 | return 0; | |
485 | return is_ejectable(handle); | |
486 | } | |
487 | EXPORT_SYMBOL_GPL(acpi_pci_check_ejectable); | |
488 | ||
489 | static acpi_status | |
490 | check_hotplug(acpi_handle handle, u32 lvl, void *context, void **rv) | |
491 | { | |
492 | int *found = (int *)context; | |
493 | if (is_ejectable(handle)) { | |
494 | *found = 1; | |
495 | return AE_CTRL_TERMINATE; | |
496 | } | |
497 | return AE_OK; | |
498 | } | |
499 | ||
500 | /** | |
501 | * acpi_pci_detect_ejectable - check if the PCI bus has ejectable slots | |
7f538669 | 502 | * @handle - handle of the PCI bus to scan |
e8c331e9 KK |
503 | * |
504 | * Returns 1 if the PCI bus has ACPI based ejectable slots, 0 otherwise. | |
505 | */ | |
7f538669 | 506 | int acpi_pci_detect_ejectable(acpi_handle handle) |
e8c331e9 | 507 | { |
e8c331e9 KK |
508 | int found = 0; |
509 | ||
7f538669 AC |
510 | if (!handle) |
511 | return found; | |
512 | ||
513 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, | |
e8c331e9 KK |
514 | check_hotplug, (void *)&found, NULL); |
515 | return found; | |
516 | } | |
517 | EXPORT_SYMBOL_GPL(acpi_pci_detect_ejectable); | |
518 | ||
aad20cab KK |
519 | module_param(debug_acpi, bool, 0644); |
520 | MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not"); |