blob: 720ebcf29fdfbb9a9bf05a44cee1fc4e53e4a238 [file] [log] [blame]
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +08001#include <linux/acpi.h>
2#include <acpi/acpi_drivers.h>
3#include "tpm.h"
4
5static const u8 tpm_ppi_uuid[] = {
6 0xA6, 0xFA, 0xDD, 0x3D,
7 0x1B, 0x36,
8 0xB4, 0x4E,
9 0xA4, 0x24,
10 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53
11};
12static char *tpm_device_name = "TPM";
13
14#define TPM_PPI_REVISION_ID 1
15#define TPM_PPI_FN_VERSION 1
16#define TPM_PPI_FN_SUBREQ 2
17#define TPM_PPI_FN_GETREQ 3
18#define TPM_PPI_FN_GETACT 4
19#define TPM_PPI_FN_GETRSP 5
20#define TPM_PPI_FN_SUBREQ2 7
21#define TPM_PPI_FN_GETOPR 8
22#define PPI_TPM_REQ_MAX 22
23#define PPI_VS_REQ_START 128
24#define PPI_VS_REQ_END 255
25#define PPI_VERSION_LEN 3
26
27static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context,
28 void **return_value)
29{
30 acpi_status status;
31 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
32 status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
33 if (strstr(buffer.pointer, context) != NULL) {
34 *return_value = handle;
35 kfree(buffer.pointer);
36 return AE_CTRL_TERMINATE;
37 }
38 return AE_OK;
39}
40
41static inline void ppi_assign_params(union acpi_object params[4],
42 u64 function_num)
43{
44 params[0].type = ACPI_TYPE_BUFFER;
45 params[0].buffer.length = sizeof(tpm_ppi_uuid);
46 params[0].buffer.pointer = (char *)tpm_ppi_uuid;
47 params[1].type = ACPI_TYPE_INTEGER;
48 params[1].integer.value = TPM_PPI_REVISION_ID;
49 params[2].type = ACPI_TYPE_INTEGER;
50 params[2].integer.value = function_num;
51 params[3].type = ACPI_TYPE_PACKAGE;
52 params[3].package.count = 0;
53 params[3].package.elements = NULL;
54}
55
Xiaoyan Zhang81198072013-08-29 20:39:11 +080056static ssize_t tpm_show_ppi_version(struct device *dev,
57 struct device_attribute *attr, char *buf)
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +080058{
59 acpi_handle handle;
60 acpi_status status;
61 struct acpi_object_list input;
62 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
63 union acpi_object params[4];
64 union acpi_object *obj;
65
66 input.count = 4;
67 ppi_assign_params(params, TPM_PPI_FN_VERSION);
68 input.pointer = params;
69 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
70 ACPI_UINT32_MAX, ppi_callback, NULL,
71 tpm_device_name, &handle);
72 if (ACPI_FAILURE(status))
73 return -ENXIO;
74
75 status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
76 ACPI_TYPE_STRING);
77 if (ACPI_FAILURE(status))
78 return -ENOMEM;
79 obj = (union acpi_object *)output.pointer;
80 status = scnprintf(buf, PAGE_SIZE, "%s\n", obj->string.pointer);
81 kfree(output.pointer);
82 return status;
83}
84
Xiaoyan Zhang81198072013-08-29 20:39:11 +080085static ssize_t tpm_show_ppi_request(struct device *dev,
86 struct device_attribute *attr, char *buf)
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +080087{
88 acpi_handle handle;
89 acpi_status status;
90 struct acpi_object_list input;
91 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
92 union acpi_object params[4];
93 union acpi_object *ret_obj;
94
95 input.count = 4;
96 ppi_assign_params(params, TPM_PPI_FN_GETREQ);
97 input.pointer = params;
98 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
99 ACPI_UINT32_MAX, ppi_callback, NULL,
100 tpm_device_name, &handle);
101 if (ACPI_FAILURE(status))
102 return -ENXIO;
103
104 status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
105 ACPI_TYPE_PACKAGE);
106 if (ACPI_FAILURE(status))
107 return -ENOMEM;
108 /*
109 * output.pointer should be of package type, including two integers.
110 * The first is function return code, 0 means success and 1 means
111 * error. The second is pending TPM operation requested by the OS, 0
112 * means none and >0 means operation value.
113 */
114 ret_obj = ((union acpi_object *)output.pointer)->package.elements;
115 if (ret_obj->type == ACPI_TYPE_INTEGER) {
116 if (ret_obj->integer.value) {
117 status = -EFAULT;
118 goto cleanup;
119 }
120 ret_obj++;
121 if (ret_obj->type == ACPI_TYPE_INTEGER)
122 status = scnprintf(buf, PAGE_SIZE, "%llu\n",
123 ret_obj->integer.value);
124 else
125 status = -EINVAL;
126 } else {
127 status = -EINVAL;
128 }
129cleanup:
130 kfree(output.pointer);
131 return status;
132}
133
Xiaoyan Zhang81198072013-08-29 20:39:11 +0800134static ssize_t tpm_store_ppi_request(struct device *dev,
135 struct device_attribute *attr,
136 const char *buf, size_t count)
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +0800137{
138 char version[PPI_VERSION_LEN + 1];
139 acpi_handle handle;
140 acpi_status status;
141 struct acpi_object_list input;
142 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
143 union acpi_object params[4];
144 union acpi_object obj;
145 u32 req;
146 u64 ret;
147
148 input.count = 4;
149 ppi_assign_params(params, TPM_PPI_FN_VERSION);
150 input.pointer = params;
151 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
152 ACPI_UINT32_MAX, ppi_callback, NULL,
153 tpm_device_name, &handle);
154 if (ACPI_FAILURE(status))
155 return -ENXIO;
156
157 status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
158 ACPI_TYPE_STRING);
159 if (ACPI_FAILURE(status))
160 return -ENOMEM;
161 strncpy(version,
162 ((union acpi_object *)output.pointer)->string.pointer,
163 PPI_VERSION_LEN);
164 kfree(output.pointer);
165 output.length = ACPI_ALLOCATE_BUFFER;
166 output.pointer = NULL;
167 /*
168 * the function to submit TPM operation request to pre-os environment
169 * is updated with function index from SUBREQ to SUBREQ2 since PPI
170 * version 1.1
171 */
172 if (strcmp(version, "1.1") == -1)
173 params[2].integer.value = TPM_PPI_FN_SUBREQ;
174 else
175 params[2].integer.value = TPM_PPI_FN_SUBREQ2;
176 /*
177 * PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS
178 * accept buffer/string/integer type, but some BIOS accept buffer/
179 * string/package type. For PPI version 1.0 and 1.1, use buffer type
180 * for compatibility, and use package type since 1.2 according to spec.
181 */
182 if (strcmp(version, "1.2") == -1) {
183 params[3].type = ACPI_TYPE_BUFFER;
184 params[3].buffer.length = sizeof(req);
185 sscanf(buf, "%d", &req);
186 params[3].buffer.pointer = (char *)&req;
187 } else {
188 params[3].package.count = 1;
189 obj.type = ACPI_TYPE_INTEGER;
190 sscanf(buf, "%llu", &obj.integer.value);
191 params[3].package.elements = &obj;
192 }
193
194 status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
195 ACPI_TYPE_INTEGER);
196 if (ACPI_FAILURE(status))
197 return -ENOMEM;
198 ret = ((union acpi_object *)output.pointer)->integer.value;
199 if (ret == 0)
200 status = (acpi_status)count;
201 else if (ret == 1)
202 status = -EPERM;
203 else
204 status = -EFAULT;
205 kfree(output.pointer);
206 return status;
207}
208
Xiaoyan Zhang81198072013-08-29 20:39:11 +0800209static ssize_t tpm_show_ppi_transition_action(struct device *dev,
210 struct device_attribute *attr,
211 char *buf)
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +0800212{
213 char version[PPI_VERSION_LEN + 1];
214 acpi_handle handle;
215 acpi_status status;
216 struct acpi_object_list input;
217 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
218 union acpi_object params[4];
219 u32 ret;
220 char *info[] = {
221 "None",
222 "Shutdown",
223 "Reboot",
224 "OS Vendor-specific",
225 "Error",
226 };
227 input.count = 4;
228 ppi_assign_params(params, TPM_PPI_FN_VERSION);
229 input.pointer = params;
230 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
231 ACPI_UINT32_MAX, ppi_callback, NULL,
232 tpm_device_name, &handle);
233 if (ACPI_FAILURE(status))
234 return -ENXIO;
235
236 status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
237 ACPI_TYPE_STRING);
238 if (ACPI_FAILURE(status))
239 return -ENOMEM;
240 strncpy(version,
241 ((union acpi_object *)output.pointer)->string.pointer,
242 PPI_VERSION_LEN);
243 /*
244 * PPI spec defines params[3].type as empty package, but some platforms
245 * (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
246 * compatibility, define params[3].type as buffer, if PPI version < 1.2
247 */
248 if (strcmp(version, "1.2") == -1) {
249 params[3].type = ACPI_TYPE_BUFFER;
250 params[3].buffer.length = 0;
251 params[3].buffer.pointer = NULL;
252 }
253 params[2].integer.value = TPM_PPI_FN_GETACT;
254 kfree(output.pointer);
255 output.length = ACPI_ALLOCATE_BUFFER;
256 output.pointer = NULL;
257 status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
258 ACPI_TYPE_INTEGER);
259 if (ACPI_FAILURE(status))
260 return -ENOMEM;
261 ret = ((union acpi_object *)output.pointer)->integer.value;
262 if (ret < ARRAY_SIZE(info) - 1)
263 status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
264 else
265 status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
266 info[ARRAY_SIZE(info)-1]);
267 kfree(output.pointer);
268 return status;
269}
270
Xiaoyan Zhang81198072013-08-29 20:39:11 +0800271static ssize_t tpm_show_ppi_response(struct device *dev,
272 struct device_attribute *attr,
273 char *buf)
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +0800274{
275 acpi_handle handle;
276 acpi_status status;
277 struct acpi_object_list input;
278 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
279 union acpi_object params[4];
280 union acpi_object *ret_obj;
281 u64 req;
282
283 input.count = 4;
284 ppi_assign_params(params, TPM_PPI_FN_GETRSP);
285 input.pointer = params;
286 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
287 ACPI_UINT32_MAX, ppi_callback, NULL,
288 tpm_device_name, &handle);
289 if (ACPI_FAILURE(status))
290 return -ENXIO;
291
292 status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
293 ACPI_TYPE_PACKAGE);
294 if (ACPI_FAILURE(status))
295 return -ENOMEM;
296 /*
297 * parameter output.pointer should be of package type, including
298 * 3 integers. The first means function return code, the second means
299 * most recent TPM operation request, and the last means response to
300 * the most recent TPM operation request. Only if the first is 0, and
301 * the second integer is not 0, the response makes sense.
302 */
303 ret_obj = ((union acpi_object *)output.pointer)->package.elements;
304 if (ret_obj->type != ACPI_TYPE_INTEGER) {
305 status = -EINVAL;
306 goto cleanup;
307 }
308 if (ret_obj->integer.value) {
309 status = -EFAULT;
310 goto cleanup;
311 }
312 ret_obj++;
313 if (ret_obj->type != ACPI_TYPE_INTEGER) {
314 status = -EINVAL;
315 goto cleanup;
316 }
317 if (ret_obj->integer.value) {
318 req = ret_obj->integer.value;
319 ret_obj++;
320 if (ret_obj->type != ACPI_TYPE_INTEGER) {
321 status = -EINVAL;
322 goto cleanup;
323 }
324 if (ret_obj->integer.value == 0)
325 status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
326 "0: Success");
327 else if (ret_obj->integer.value == 0xFFFFFFF0)
328 status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
329 "0xFFFFFFF0: User Abort");
330 else if (ret_obj->integer.value == 0xFFFFFFF1)
331 status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
332 "0xFFFFFFF1: BIOS Failure");
333 else if (ret_obj->integer.value >= 1 &&
334 ret_obj->integer.value <= 0x00000FFF)
335 status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
336 req, ret_obj->integer.value,
337 "Corresponding TPM error");
338 else
339 status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
340 req, ret_obj->integer.value,
341 "Error");
342 } else {
343 status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
344 ret_obj->integer.value, "No Recent Request");
345 }
346cleanup:
347 kfree(output.pointer);
348 return status;
349}
350
351static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
352{
353 char *str = buf;
354 char version[PPI_VERSION_LEN];
355 acpi_handle handle;
356 acpi_status status;
357 struct acpi_object_list input;
358 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
359 union acpi_object params[4];
360 union acpi_object obj;
361 int i;
362 u32 ret;
363 char *info[] = {
364 "Not implemented",
365 "BIOS only",
366 "Blocked for OS by BIOS",
367 "User required",
368 "User not required",
369 };
370 input.count = 4;
371 ppi_assign_params(params, TPM_PPI_FN_VERSION);
372 input.pointer = params;
373 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
374 ACPI_UINT32_MAX, ppi_callback, NULL,
375 tpm_device_name, &handle);
376 if (ACPI_FAILURE(status))
377 return -ENXIO;
378
379 status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output,
380 ACPI_TYPE_STRING);
381 if (ACPI_FAILURE(status))
382 return -ENOMEM;
383
384 strncpy(version,
385 ((union acpi_object *)output.pointer)->string.pointer,
386 PPI_VERSION_LEN);
387 kfree(output.pointer);
388 output.length = ACPI_ALLOCATE_BUFFER;
389 output.pointer = NULL;
390 if (strcmp(version, "1.2") == -1)
391 return -EPERM;
392
393 params[2].integer.value = TPM_PPI_FN_GETOPR;
394 params[3].package.count = 1;
395 obj.type = ACPI_TYPE_INTEGER;
396 params[3].package.elements = &obj;
397 for (i = start; i <= end; i++) {
398 obj.integer.value = i;
399 status = acpi_evaluate_object_typed(handle, "_DSM",
400 &input, &output, ACPI_TYPE_INTEGER);
401 if (ACPI_FAILURE(status))
402 return -ENOMEM;
403
404 ret = ((union acpi_object *)output.pointer)->integer.value;
405 if (ret > 0 && ret < ARRAY_SIZE(info))
406 str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
407 i, ret, info[ret]);
408 kfree(output.pointer);
409 output.length = ACPI_ALLOCATE_BUFFER;
410 output.pointer = NULL;
411 }
412 return str - buf;
413}
414
Xiaoyan Zhang81198072013-08-29 20:39:11 +0800415static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
416 struct device_attribute *attr,
417 char *buf)
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +0800418{
419 return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX);
420}
421
Xiaoyan Zhang81198072013-08-29 20:39:11 +0800422static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
423 struct device_attribute *attr,
424 char *buf)
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +0800425{
426 return show_ppi_operations(buf, PPI_VS_REQ_START, PPI_VS_REQ_END);
427}
428
429static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
430static DEVICE_ATTR(request, S_IRUGO | S_IWUSR | S_IWGRP,
431 tpm_show_ppi_request, tpm_store_ppi_request);
432static DEVICE_ATTR(transition_action, S_IRUGO,
433 tpm_show_ppi_transition_action, NULL);
434static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
435static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
436static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);
437
438static struct attribute *ppi_attrs[] = {
439 &dev_attr_version.attr,
440 &dev_attr_request.attr,
441 &dev_attr_transition_action.attr,
442 &dev_attr_response.attr,
443 &dev_attr_tcg_operations.attr,
444 &dev_attr_vs_operations.attr, NULL,
445};
446static struct attribute_group ppi_attr_grp = {
Gang Wei1631cfb2012-10-09 17:35:22 +0800447 .name = "ppi",
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +0800448 .attrs = ppi_attrs
449};
450
Gang Wei1631cfb2012-10-09 17:35:22 +0800451int tpm_add_ppi(struct kobject *parent)
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +0800452{
Gang Wei1631cfb2012-10-09 17:35:22 +0800453 return sysfs_create_group(parent, &ppi_attr_grp);
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +0800454}
Gang Wei1631cfb2012-10-09 17:35:22 +0800455EXPORT_SYMBOL_GPL(tpm_add_ppi);
456
457void tpm_remove_ppi(struct kobject *parent)
458{
459 sysfs_remove_group(parent, &ppi_attr_grp);
460}
461EXPORT_SYMBOL_GPL(tpm_remove_ppi);
Xiaoyan Zhangf84fdff2012-08-22 18:47:22 +0800462
463MODULE_LICENSE("GPL");