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20#include <linux/acpi.h>
21#include "tpm.h"
22
23#define TPM_PPI_REVISION_ID 1
24#define TPM_PPI_FN_VERSION 1
25#define TPM_PPI_FN_SUBREQ 2
26#define TPM_PPI_FN_GETREQ 3
27#define TPM_PPI_FN_GETACT 4
28#define TPM_PPI_FN_GETRSP 5
29#define TPM_PPI_FN_SUBREQ2 7
30#define TPM_PPI_FN_GETOPR 8
31#define PPI_TPM_REQ_MAX 22
32#define PPI_VS_REQ_START 128
33#define PPI_VS_REQ_END 255
34
35static const guid_t tpm_ppi_guid =
36 GUID_INIT(0x3DDDFAA6, 0x361B, 0x4EB4,
37 0xA4, 0x24, 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53);
38
39static inline union acpi_object *
40tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
41 union acpi_object *argv4)
42{
43 BUG_ON(!ppi_handle);
44 return acpi_evaluate_dsm_typed(ppi_handle, &tpm_ppi_guid,
45 TPM_PPI_REVISION_ID,
46 func, argv4, type);
47}
48
49static ssize_t tpm_show_ppi_version(struct device *dev,
50 struct device_attribute *attr, char *buf)
51{
52 struct tpm_chip *chip = to_tpm_chip(dev);
53
54 return scnprintf(buf, PAGE_SIZE, "%s\n", chip->ppi_version);
55}
56
57static ssize_t tpm_show_ppi_request(struct device *dev,
58 struct device_attribute *attr, char *buf)
59{
60 ssize_t size = -EINVAL;
61 union acpi_object *obj;
62 struct tpm_chip *chip = to_tpm_chip(dev);
63
64 obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
65 ACPI_TYPE_PACKAGE, NULL);
66 if (!obj)
67 return -ENXIO;
68
69
70
71
72
73
74
75 if (obj->package.count == 2 &&
76 obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
77 obj->package.elements[1].type == ACPI_TYPE_INTEGER) {
78 if (obj->package.elements[0].integer.value)
79 size = -EFAULT;
80 else
81 size = scnprintf(buf, PAGE_SIZE, "%llu\n",
82 obj->package.elements[1].integer.value);
83 }
84
85 ACPI_FREE(obj);
86
87 return size;
88}
89
90static ssize_t tpm_store_ppi_request(struct device *dev,
91 struct device_attribute *attr,
92 const char *buf, size_t count)
93{
94 u32 req;
95 u64 ret;
96 int func = TPM_PPI_FN_SUBREQ;
97 union acpi_object *obj, tmp;
98 union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
99 struct tpm_chip *chip = to_tpm_chip(dev);
100
101
102
103
104
105
106 if (acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
107 TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_SUBREQ2))
108 func = TPM_PPI_FN_SUBREQ2;
109
110
111
112
113
114
115
116 if (strcmp(chip->ppi_version, "1.2") < 0) {
117 if (sscanf(buf, "%d", &req) != 1)
118 return -EINVAL;
119 argv4.type = ACPI_TYPE_BUFFER;
120 argv4.buffer.length = sizeof(req);
121 argv4.buffer.pointer = (u8 *)&req;
122 } else {
123 tmp.type = ACPI_TYPE_INTEGER;
124 if (sscanf(buf, "%llu", &tmp.integer.value) != 1)
125 return -EINVAL;
126 }
127
128 obj = tpm_eval_dsm(chip->acpi_dev_handle, func, ACPI_TYPE_INTEGER,
129 &argv4);
130 if (!obj) {
131 return -ENXIO;
132 } else {
133 ret = obj->integer.value;
134 ACPI_FREE(obj);
135 }
136
137 if (ret == 0)
138 return (acpi_status)count;
139
140 return (ret == 1) ? -EPERM : -EFAULT;
141}
142
143static ssize_t tpm_show_ppi_transition_action(struct device *dev,
144 struct device_attribute *attr,
145 char *buf)
146{
147 u32 ret;
148 acpi_status status;
149 union acpi_object *obj = NULL;
150 union acpi_object tmp = {
151 .buffer.type = ACPI_TYPE_BUFFER,
152 .buffer.length = 0,
153 .buffer.pointer = NULL
154 };
155 struct tpm_chip *chip = to_tpm_chip(dev);
156
157 static char *info[] = {
158 "None",
159 "Shutdown",
160 "Reboot",
161 "OS Vendor-specific",
162 "Error",
163 };
164
165
166
167
168
169
170 if (strcmp(chip->ppi_version, "1.2") < 0)
171 obj = &tmp;
172 obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETACT,
173 ACPI_TYPE_INTEGER, obj);
174 if (!obj) {
175 return -ENXIO;
176 } else {
177 ret = obj->integer.value;
178 ACPI_FREE(obj);
179 }
180
181 if (ret < ARRAY_SIZE(info) - 1)
182 status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
183 else
184 status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
185 info[ARRAY_SIZE(info)-1]);
186 return status;
187}
188
189static ssize_t tpm_show_ppi_response(struct device *dev,
190 struct device_attribute *attr,
191 char *buf)
192{
193 acpi_status status = -EINVAL;
194 union acpi_object *obj, *ret_obj;
195 u64 req, res;
196 struct tpm_chip *chip = to_tpm_chip(dev);
197
198 obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETRSP,
199 ACPI_TYPE_PACKAGE, NULL);
200 if (!obj)
201 return -ENXIO;
202
203
204
205
206
207
208
209
210 ret_obj = obj->package.elements;
211 if (obj->package.count < 3 ||
212 ret_obj[0].type != ACPI_TYPE_INTEGER ||
213 ret_obj[1].type != ACPI_TYPE_INTEGER ||
214 ret_obj[2].type != ACPI_TYPE_INTEGER)
215 goto cleanup;
216
217 if (ret_obj[0].integer.value) {
218 status = -EFAULT;
219 goto cleanup;
220 }
221
222 req = ret_obj[1].integer.value;
223 res = ret_obj[2].integer.value;
224 if (req) {
225 if (res == 0)
226 status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
227 "0: Success");
228 else if (res == 0xFFFFFFF0)
229 status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
230 "0xFFFFFFF0: User Abort");
231 else if (res == 0xFFFFFFF1)
232 status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
233 "0xFFFFFFF1: BIOS Failure");
234 else if (res >= 1 && res <= 0x00000FFF)
235 status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
236 req, res, "Corresponding TPM error");
237 else
238 status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
239 req, res, "Error");
240 } else {
241 status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
242 req, "No Recent Request");
243 }
244
245cleanup:
246 ACPI_FREE(obj);
247 return status;
248}
249
250static ssize_t show_ppi_operations(acpi_handle dev_handle, char *buf, u32 start,
251 u32 end)
252{
253 int i;
254 u32 ret;
255 char *str = buf;
256 union acpi_object *obj, tmp;
257 union acpi_object argv = ACPI_INIT_DSM_ARGV4(1, &tmp);
258
259 static char *info[] = {
260 "Not implemented",
261 "BIOS only",
262 "Blocked for OS by BIOS",
263 "User required",
264 "User not required",
265 };
266
267 if (!acpi_check_dsm(dev_handle, &tpm_ppi_guid, TPM_PPI_REVISION_ID,
268 1 << TPM_PPI_FN_GETOPR))
269 return -EPERM;
270
271 tmp.integer.type = ACPI_TYPE_INTEGER;
272 for (i = start; i <= end; i++) {
273 tmp.integer.value = i;
274 obj = tpm_eval_dsm(dev_handle, TPM_PPI_FN_GETOPR,
275 ACPI_TYPE_INTEGER, &argv);
276 if (!obj) {
277 return -ENOMEM;
278 } else {
279 ret = obj->integer.value;
280 ACPI_FREE(obj);
281 }
282
283 if (ret > 0 && ret < ARRAY_SIZE(info))
284 str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
285 i, ret, info[ret]);
286 }
287
288 return str - buf;
289}
290
291static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
292 struct device_attribute *attr,
293 char *buf)
294{
295 struct tpm_chip *chip = to_tpm_chip(dev);
296
297 return show_ppi_operations(chip->acpi_dev_handle, buf, 0,
298 PPI_TPM_REQ_MAX);
299}
300
301static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
302 struct device_attribute *attr,
303 char *buf)
304{
305 struct tpm_chip *chip = to_tpm_chip(dev);
306
307 return show_ppi_operations(chip->acpi_dev_handle, buf, PPI_VS_REQ_START,
308 PPI_VS_REQ_END);
309}
310
311static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
312static DEVICE_ATTR(request, S_IRUGO | S_IWUSR | S_IWGRP,
313 tpm_show_ppi_request, tpm_store_ppi_request);
314static DEVICE_ATTR(transition_action, S_IRUGO,
315 tpm_show_ppi_transition_action, NULL);
316static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
317static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
318static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);
319
320static struct attribute *ppi_attrs[] = {
321 &dev_attr_version.attr,
322 &dev_attr_request.attr,
323 &dev_attr_transition_action.attr,
324 &dev_attr_response.attr,
325 &dev_attr_tcg_operations.attr,
326 &dev_attr_vs_operations.attr, NULL,
327};
328static struct attribute_group ppi_attr_grp = {
329 .name = "ppi",
330 .attrs = ppi_attrs
331};
332
333void tpm_add_ppi(struct tpm_chip *chip)
334{
335 union acpi_object *obj;
336
337 if (!chip->acpi_dev_handle)
338 return;
339
340 if (!acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
341 TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_VERSION))
342 return;
343
344
345 obj = acpi_evaluate_dsm_typed(chip->acpi_dev_handle, &tpm_ppi_guid,
346 TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
347 NULL, ACPI_TYPE_STRING);
348 if (obj) {
349 strlcpy(chip->ppi_version, obj->string.pointer,
350 sizeof(chip->ppi_version));
351 ACPI_FREE(obj);
352 }
353
354 chip->groups[chip->groups_cnt++] = &ppi_attr_grp;
355}
356
