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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> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
1da177e4 | 36 | |
aad20cab KK |
37 | #define MY_NAME "acpi_pcihp" |
38 | ||
66bef8c0 | 39 | #define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0) |
aad20cab KK |
40 | #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg) |
41 | #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg) | |
42 | #define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg) | |
43 | ||
1da177e4 | 44 | #define METHOD_NAME__SUN "_SUN" |
1da177e4 LT |
45 | #define METHOD_NAME_OSHP "OSHP" |
46 | ||
90ab5ee9 | 47 | static bool debug_acpi; |
aad20cab | 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 RS |
215 | static acpi_status |
216 | acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp) | |
1da177e4 | 217 | { |
5e3573db BH |
218 | acpi_status status; |
219 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
220 | union acpi_object *package, *fields; | |
221 | int i; | |
b2e6e3ba | 222 | |
e22b7350 KK |
223 | memset(hpp, 0, sizeof(struct hotplug_params)); |
224 | ||
5e3573db BH |
225 | status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer); |
226 | if (ACPI_FAILURE(status)) | |
227 | return status; | |
1da177e4 | 228 | |
5e3573db BH |
229 | package = (union acpi_object *) buffer.pointer; |
230 | if (package->type != ACPI_TYPE_PACKAGE || | |
231 | package->package.count != 4) { | |
a8a2be94 | 232 | status = AE_ERROR; |
5e3573db | 233 | goto exit; |
1da177e4 LT |
234 | } |
235 | ||
5e3573db BH |
236 | fields = package->package.elements; |
237 | for (i = 0; i < 4; i++) { | |
238 | if (fields[i].type != ACPI_TYPE_INTEGER) { | |
a8a2be94 | 239 | status = AE_ERROR; |
5e3573db | 240 | goto exit; |
1da177e4 LT |
241 | } |
242 | } | |
243 | ||
e22b7350 | 244 | hpp->t0 = &hpp->type0_data; |
5e3573db BH |
245 | hpp->t0->revision = 1; |
246 | hpp->t0->cache_line_size = fields[0].integer.value; | |
247 | hpp->t0->latency_timer = fields[1].integer.value; | |
248 | hpp->t0->enable_serr = fields[2].integer.value; | |
249 | hpp->t0->enable_perr = fields[3].integer.value; | |
1da177e4 | 250 | |
5e3573db BH |
251 | exit: |
252 | kfree(buffer.pointer); | |
a8a2be94 | 253 | return status; |
1da177e4 LT |
254 | } |
255 | ||
783c49fc KA |
256 | |
257 | ||
258 | /* acpi_run_oshp - get control of hotplug from the firmware | |
259 | * | |
260 | * @handle - the handle of the hotplug controller. | |
261 | */ | |
ac9c052d | 262 | static acpi_status acpi_run_oshp(acpi_handle handle) |
1da177e4 LT |
263 | { |
264 | acpi_status status; | |
b2e6e3ba MT |
265 | struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; |
266 | ||
267 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); | |
1da177e4 LT |
268 | |
269 | /* run OSHP */ | |
a8a2be94 | 270 | status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL); |
783c49fc | 271 | if (ACPI_FAILURE(status)) |
aad20cab KK |
272 | if (status != AE_NOT_FOUND) |
273 | printk(KERN_ERR "%s:%s OSHP fails=0x%x\n", | |
66bef8c0 | 274 | __func__, (char *)string.pointer, status); |
aad20cab KK |
275 | else |
276 | dbg("%s:%s OSHP not found\n", | |
66bef8c0 | 277 | __func__, (char *)string.pointer); |
783c49fc | 278 | else |
66bef8c0 | 279 | pr_debug("%s:%s OSHP passes\n", __func__, |
b2e6e3ba MT |
280 | (char *)string.pointer); |
281 | ||
81b26bca | 282 | kfree(string.pointer); |
783c49fc KA |
283 | return status; |
284 | } | |
783c49fc | 285 | |
e81995bb | 286 | /* pci_get_hp_params |
783c49fc | 287 | * |
6a29172b | 288 | * @dev - the pci_dev for which we want parameters |
783c49fc KA |
289 | * @hpp - allocated by the caller |
290 | */ | |
e81995bb | 291 | int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp) |
783c49fc | 292 | { |
6a29172b | 293 | acpi_status status; |
7430e34c | 294 | acpi_handle handle, phandle; |
267efd7e KK |
295 | struct pci_bus *pbus; |
296 | ||
297 | handle = NULL; | |
6a29172b | 298 | for (pbus = dev->bus; pbus; pbus = pbus->parent) { |
267efd7e KK |
299 | handle = acpi_pci_get_bridge_handle(pbus); |
300 | if (handle) | |
7430e34c | 301 | break; |
267efd7e | 302 | } |
783c49fc KA |
303 | |
304 | /* | |
305 | * _HPP settings apply to all child buses, until another _HPP is | |
306 | * encountered. If we don't find an _HPP for the input pci dev, | |
307 | * look for it in the parent device scope since that would apply to | |
e81995bb | 308 | * this pci dev. |
783c49fc | 309 | */ |
7430e34c | 310 | while (handle) { |
e22b7350 KK |
311 | status = acpi_run_hpx(handle, hpp); |
312 | if (ACPI_SUCCESS(status)) | |
6a29172b | 313 | return 0; |
783c49fc | 314 | status = acpi_run_hpp(handle, hpp); |
7430e34c | 315 | if (ACPI_SUCCESS(status)) |
6a29172b | 316 | return 0; |
27558203 | 317 | if (acpi_is_root_bridge(handle)) |
7430e34c KK |
318 | break; |
319 | status = acpi_get_parent(handle, &phandle); | |
320 | if (ACPI_FAILURE(status)) | |
783c49fc | 321 | break; |
7430e34c | 322 | handle = phandle; |
1da177e4 | 323 | } |
6a29172b | 324 | return -ENODEV; |
1da177e4 | 325 | } |
e81995bb | 326 | EXPORT_SYMBOL_GPL(pci_get_hp_params); |
783c49fc | 327 | |
ac9c052d KK |
328 | /** |
329 | * acpi_get_hp_hw_control_from_firmware | |
330 | * @dev: the pci_dev of the bridge that has a hotplug controller | |
331 | * @flags: requested control bits for _OSC | |
332 | * | |
333 | * Attempt to take hotplug control from firmware. | |
334 | */ | |
d391f00f | 335 | int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev, u32 flags) |
ac9c052d KK |
336 | { |
337 | acpi_status status; | |
e0d94bee | 338 | acpi_handle chandle, handle; |
ac9c052d KK |
339 | struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; |
340 | ||
28eb5f27 | 341 | flags &= OSC_SHPC_NATIVE_HP_CONTROL; |
ac9c052d KK |
342 | if (!flags) { |
343 | err("Invalid flags %u specified!\n", flags); | |
344 | return -EINVAL; | |
345 | } | |
346 | ||
347 | /* | |
348 | * Per PCI firmware specification, we should run the ACPI _OSC | |
349 | * method to get control of hotplug hardware before using it. If | |
350 | * an _OSC is missing, we look for an OSHP to do the same thing. | |
e0d94bee JS |
351 | * To handle different BIOS behavior, we look for _OSC on a root |
352 | * bridge preferentially (according to PCI fw spec). Later for | |
353 | * OSHP within the scope of the hotplug controller and its parents, | |
25985edc | 354 | * up to the host bridge under which this controller exists. |
ac9c052d | 355 | */ |
056c58e8 | 356 | handle = acpi_find_root_bridge_handle(pdev); |
e0d94bee JS |
357 | if (handle) { |
358 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); | |
359 | dbg("Trying to get hotplug control for %s\n", | |
360 | (char *)string.pointer); | |
75fb60f2 | 361 | status = acpi_pci_osc_control_set(handle, &flags, flags); |
e0d94bee JS |
362 | if (ACPI_SUCCESS(status)) |
363 | goto got_one; | |
9b536e0b KK |
364 | if (status == AE_SUPPORT) |
365 | goto no_control; | |
e0d94bee JS |
366 | kfree(string.pointer); |
367 | string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL }; | |
368 | } | |
369 | ||
d391f00f KK |
370 | handle = DEVICE_ACPI_HANDLE(&pdev->dev); |
371 | if (!handle) { | |
ac9c052d KK |
372 | /* |
373 | * This hotplug controller was not listed in the ACPI name | |
374 | * space at all. Try to get acpi handle of parent pci bus. | |
375 | */ | |
d391f00f KK |
376 | struct pci_bus *pbus; |
377 | for (pbus = pdev->bus; pbus; pbus = pbus->parent) { | |
378 | handle = acpi_pci_get_bridge_handle(pbus); | |
379 | if (handle) | |
380 | break; | |
381 | } | |
ac9c052d KK |
382 | } |
383 | ||
384 | while (handle) { | |
385 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); | |
386 | dbg("Trying to get hotplug control for %s \n", | |
387 | (char *)string.pointer); | |
e0d94bee JS |
388 | status = acpi_run_oshp(handle); |
389 | if (ACPI_SUCCESS(status)) | |
390 | goto got_one; | |
27558203 | 391 | if (acpi_is_root_bridge(handle)) |
ac9c052d KK |
392 | break; |
393 | chandle = handle; | |
394 | status = acpi_get_parent(chandle, &handle); | |
395 | if (ACPI_FAILURE(status)) | |
396 | break; | |
397 | } | |
9b536e0b | 398 | no_control: |
ac9c052d | 399 | dbg("Cannot get control of hotplug hardware for pci %s\n", |
d391f00f | 400 | pci_name(pdev)); |
ac9c052d KK |
401 | kfree(string.pointer); |
402 | return -ENODEV; | |
e0d94bee | 403 | got_one: |
d391f00f KK |
404 | dbg("Gained control for hotplug HW for pci %s (%s)\n", |
405 | pci_name(pdev), (char *)string.pointer); | |
e0d94bee JS |
406 | kfree(string.pointer); |
407 | return 0; | |
ac9c052d KK |
408 | } |
409 | EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware); | |
1da177e4 | 410 | |
efe6d727 | 411 | static int pcihp_is_ejectable(acpi_handle handle) |
e8c331e9 KK |
412 | { |
413 | acpi_status status; | |
414 | acpi_handle tmp; | |
415 | unsigned long long removable; | |
416 | status = acpi_get_handle(handle, "_ADR", &tmp); | |
417 | if (ACPI_FAILURE(status)) | |
418 | return 0; | |
419 | status = acpi_get_handle(handle, "_EJ0", &tmp); | |
420 | if (ACPI_SUCCESS(status)) | |
421 | return 1; | |
422 | status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable); | |
423 | if (ACPI_SUCCESS(status) && removable) | |
424 | return 1; | |
425 | return 0; | |
426 | } | |
427 | ||
428 | /** | |
429 | * acpi_pcihp_check_ejectable - check if handle is ejectable ACPI PCI slot | |
430 | * @pbus: the PCI bus of the PCI slot corresponding to 'handle' | |
431 | * @handle: ACPI handle to check | |
432 | * | |
433 | * Return 1 if handle is ejectable PCI slot, 0 otherwise. | |
434 | */ | |
435 | int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle) | |
436 | { | |
437 | acpi_handle bridge_handle, parent_handle; | |
438 | ||
439 | if (!(bridge_handle = acpi_pci_get_bridge_handle(pbus))) | |
440 | return 0; | |
441 | if ((ACPI_FAILURE(acpi_get_parent(handle, &parent_handle)))) | |
442 | return 0; | |
443 | if (bridge_handle != parent_handle) | |
444 | return 0; | |
efe6d727 | 445 | return pcihp_is_ejectable(handle); |
e8c331e9 KK |
446 | } |
447 | EXPORT_SYMBOL_GPL(acpi_pci_check_ejectable); | |
448 | ||
449 | static acpi_status | |
450 | check_hotplug(acpi_handle handle, u32 lvl, void *context, void **rv) | |
451 | { | |
452 | int *found = (int *)context; | |
efe6d727 | 453 | if (pcihp_is_ejectable(handle)) { |
e8c331e9 KK |
454 | *found = 1; |
455 | return AE_CTRL_TERMINATE; | |
456 | } | |
457 | return AE_OK; | |
458 | } | |
459 | ||
460 | /** | |
461 | * acpi_pci_detect_ejectable - check if the PCI bus has ejectable slots | |
7f538669 | 462 | * @handle - handle of the PCI bus to scan |
e8c331e9 KK |
463 | * |
464 | * Returns 1 if the PCI bus has ACPI based ejectable slots, 0 otherwise. | |
465 | */ | |
7f538669 | 466 | int acpi_pci_detect_ejectable(acpi_handle handle) |
e8c331e9 | 467 | { |
e8c331e9 KK |
468 | int found = 0; |
469 | ||
7f538669 AC |
470 | if (!handle) |
471 | return found; | |
472 | ||
473 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, | |
2263576c | 474 | check_hotplug, NULL, (void *)&found, NULL); |
e8c331e9 KK |
475 | return found; |
476 | } | |
477 | EXPORT_SYMBOL_GPL(acpi_pci_detect_ejectable); | |
478 | ||
aad20cab KK |
479 | module_param(debug_acpi, bool, 0644); |
480 | MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not"); |