1 /*
2 * Intel MIC Platform Software Stack (MPSS)
3 *
4 * Copyright(c) 2015 Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2, as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * The full GNU General Public License is included in this distribution in
16 * the file called "COPYING".
17 *
18 * Intel MIC Coprocessor State Management (COSM) Driver
19 *
20 */
21 #include <linux/slab.h>
22 #include "cosm_main.h"
23
24 /*
25 * A state-to-string lookup table, for exposing a human readable state
26 * via sysfs. Always keep in sync with enum cosm_states
27 */
28 const char * const cosm_state_string[] = {
29 [MIC_READY] = "ready",
30 [MIC_BOOTING] = "booting",
31 [MIC_ONLINE] = "online",
32 [MIC_SHUTTING_DOWN] = "shutting_down",
33 [MIC_RESETTING] = "resetting",
34 [MIC_RESET_FAILED] = "reset_failed",
35 };
36
37 /*
38 * A shutdown-status-to-string lookup table, for exposing a human
39 * readable state via sysfs. Always keep in sync with enum cosm_shutdown_status
40 */
41 const char * const cosm_shutdown_status_string[] = {
42 [MIC_NOP] = "nop",
43 [MIC_CRASHED] = "crashed",
44 [MIC_HALTED] = "halted",
45 [MIC_POWER_OFF] = "poweroff",
46 [MIC_RESTART] = "restart",
47 };
48
cosm_set_shutdown_status(struct cosm_device * cdev,u8 shutdown_status)49 void cosm_set_shutdown_status(struct cosm_device *cdev, u8 shutdown_status)
50 {
51 dev_dbg(&cdev->dev, "Shutdown Status %s -> %s\n",
52 cosm_shutdown_status_string[cdev->shutdown_status],
53 cosm_shutdown_status_string[shutdown_status]);
54 cdev->shutdown_status = shutdown_status;
55 }
56
cosm_set_state(struct cosm_device * cdev,u8 state)57 void cosm_set_state(struct cosm_device *cdev, u8 state)
58 {
59 dev_dbg(&cdev->dev, "State %s -> %s\n",
60 cosm_state_string[cdev->state],
61 cosm_state_string[state]);
62 cdev->state = state;
63 sysfs_notify_dirent(cdev->state_sysfs);
64 }
65
66 static ssize_t
family_show(struct device * dev,struct device_attribute * attr,char * buf)67 family_show(struct device *dev, struct device_attribute *attr, char *buf)
68 {
69 struct cosm_device *cdev = dev_get_drvdata(dev);
70
71 if (!cdev)
72 return -EINVAL;
73
74 return cdev->hw_ops->family(cdev, buf);
75 }
76 static DEVICE_ATTR_RO(family);
77
78 static ssize_t
stepping_show(struct device * dev,struct device_attribute * attr,char * buf)79 stepping_show(struct device *dev, struct device_attribute *attr, char *buf)
80 {
81 struct cosm_device *cdev = dev_get_drvdata(dev);
82
83 if (!cdev)
84 return -EINVAL;
85
86 return cdev->hw_ops->stepping(cdev, buf);
87 }
88 static DEVICE_ATTR_RO(stepping);
89
90 static ssize_t
state_show(struct device * dev,struct device_attribute * attr,char * buf)91 state_show(struct device *dev, struct device_attribute *attr, char *buf)
92 {
93 struct cosm_device *cdev = dev_get_drvdata(dev);
94
95 if (!cdev || cdev->state >= MIC_LAST)
96 return -EINVAL;
97
98 return scnprintf(buf, PAGE_SIZE, "%s\n",
99 cosm_state_string[cdev->state]);
100 }
101
102 static ssize_t
state_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)103 state_store(struct device *dev, struct device_attribute *attr,
104 const char *buf, size_t count)
105 {
106 struct cosm_device *cdev = dev_get_drvdata(dev);
107 int rc;
108
109 if (!cdev)
110 return -EINVAL;
111
112 if (sysfs_streq(buf, "boot")) {
113 rc = cosm_start(cdev);
114 goto done;
115 }
116 if (sysfs_streq(buf, "reset")) {
117 rc = cosm_reset(cdev);
118 goto done;
119 }
120
121 if (sysfs_streq(buf, "shutdown")) {
122 rc = cosm_shutdown(cdev);
123 goto done;
124 }
125 rc = -EINVAL;
126 done:
127 if (rc)
128 count = rc;
129 return count;
130 }
131 static DEVICE_ATTR_RW(state);
132
shutdown_status_show(struct device * dev,struct device_attribute * attr,char * buf)133 static ssize_t shutdown_status_show(struct device *dev,
134 struct device_attribute *attr, char *buf)
135 {
136 struct cosm_device *cdev = dev_get_drvdata(dev);
137
138 if (!cdev || cdev->shutdown_status >= MIC_STATUS_LAST)
139 return -EINVAL;
140
141 return scnprintf(buf, PAGE_SIZE, "%s\n",
142 cosm_shutdown_status_string[cdev->shutdown_status]);
143 }
144 static DEVICE_ATTR_RO(shutdown_status);
145
146 static ssize_t
heartbeat_enable_show(struct device * dev,struct device_attribute * attr,char * buf)147 heartbeat_enable_show(struct device *dev,
148 struct device_attribute *attr, char *buf)
149 {
150 struct cosm_device *cdev = dev_get_drvdata(dev);
151
152 if (!cdev)
153 return -EINVAL;
154
155 return scnprintf(buf, PAGE_SIZE, "%d\n", cdev->sysfs_heartbeat_enable);
156 }
157
158 static ssize_t
heartbeat_enable_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)159 heartbeat_enable_store(struct device *dev,
160 struct device_attribute *attr,
161 const char *buf, size_t count)
162 {
163 struct cosm_device *cdev = dev_get_drvdata(dev);
164 int enable;
165 int ret;
166
167 if (!cdev)
168 return -EINVAL;
169
170 mutex_lock(&cdev->cosm_mutex);
171 ret = kstrtoint(buf, 10, &enable);
172 if (ret)
173 goto unlock;
174
175 cdev->sysfs_heartbeat_enable = enable;
176 /* if state is not online, cdev->heartbeat_watchdog_enable is 0 */
177 if (cdev->state == MIC_ONLINE)
178 cdev->heartbeat_watchdog_enable = enable;
179 ret = count;
180 unlock:
181 mutex_unlock(&cdev->cosm_mutex);
182 return ret;
183 }
184 static DEVICE_ATTR_RW(heartbeat_enable);
185
186 static ssize_t
cmdline_show(struct device * dev,struct device_attribute * attr,char * buf)187 cmdline_show(struct device *dev, struct device_attribute *attr, char *buf)
188 {
189 struct cosm_device *cdev = dev_get_drvdata(dev);
190 char *cmdline;
191
192 if (!cdev)
193 return -EINVAL;
194
195 cmdline = cdev->cmdline;
196
197 if (cmdline)
198 return scnprintf(buf, PAGE_SIZE, "%s\n", cmdline);
199 return 0;
200 }
201
202 static ssize_t
cmdline_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)203 cmdline_store(struct device *dev, struct device_attribute *attr,
204 const char *buf, size_t count)
205 {
206 struct cosm_device *cdev = dev_get_drvdata(dev);
207
208 if (!cdev)
209 return -EINVAL;
210
211 mutex_lock(&cdev->cosm_mutex);
212 kfree(cdev->cmdline);
213
214 cdev->cmdline = kmalloc(count + 1, GFP_KERNEL);
215 if (!cdev->cmdline) {
216 count = -ENOMEM;
217 goto unlock;
218 }
219
220 strncpy(cdev->cmdline, buf, count);
221
222 if (cdev->cmdline[count - 1] == '\n')
223 cdev->cmdline[count - 1] = '\0';
224 else
225 cdev->cmdline[count] = '\0';
226 unlock:
227 mutex_unlock(&cdev->cosm_mutex);
228 return count;
229 }
230 static DEVICE_ATTR_RW(cmdline);
231
232 static ssize_t
firmware_show(struct device * dev,struct device_attribute * attr,char * buf)233 firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
234 {
235 struct cosm_device *cdev = dev_get_drvdata(dev);
236 char *firmware;
237
238 if (!cdev)
239 return -EINVAL;
240
241 firmware = cdev->firmware;
242
243 if (firmware)
244 return scnprintf(buf, PAGE_SIZE, "%s\n", firmware);
245 return 0;
246 }
247
248 static ssize_t
firmware_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)249 firmware_store(struct device *dev, struct device_attribute *attr,
250 const char *buf, size_t count)
251 {
252 struct cosm_device *cdev = dev_get_drvdata(dev);
253
254 if (!cdev)
255 return -EINVAL;
256
257 mutex_lock(&cdev->cosm_mutex);
258 kfree(cdev->firmware);
259
260 cdev->firmware = kmalloc(count + 1, GFP_KERNEL);
261 if (!cdev->firmware) {
262 count = -ENOMEM;
263 goto unlock;
264 }
265 strncpy(cdev->firmware, buf, count);
266
267 if (cdev->firmware[count - 1] == '\n')
268 cdev->firmware[count - 1] = '\0';
269 else
270 cdev->firmware[count] = '\0';
271 unlock:
272 mutex_unlock(&cdev->cosm_mutex);
273 return count;
274 }
275 static DEVICE_ATTR_RW(firmware);
276
277 static ssize_t
ramdisk_show(struct device * dev,struct device_attribute * attr,char * buf)278 ramdisk_show(struct device *dev, struct device_attribute *attr, char *buf)
279 {
280 struct cosm_device *cdev = dev_get_drvdata(dev);
281 char *ramdisk;
282
283 if (!cdev)
284 return -EINVAL;
285
286 ramdisk = cdev->ramdisk;
287
288 if (ramdisk)
289 return scnprintf(buf, PAGE_SIZE, "%s\n", ramdisk);
290 return 0;
291 }
292
293 static ssize_t
ramdisk_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)294 ramdisk_store(struct device *dev, struct device_attribute *attr,
295 const char *buf, size_t count)
296 {
297 struct cosm_device *cdev = dev_get_drvdata(dev);
298
299 if (!cdev)
300 return -EINVAL;
301
302 mutex_lock(&cdev->cosm_mutex);
303 kfree(cdev->ramdisk);
304
305 cdev->ramdisk = kmalloc(count + 1, GFP_KERNEL);
306 if (!cdev->ramdisk) {
307 count = -ENOMEM;
308 goto unlock;
309 }
310
311 strncpy(cdev->ramdisk, buf, count);
312
313 if (cdev->ramdisk[count - 1] == '\n')
314 cdev->ramdisk[count - 1] = '\0';
315 else
316 cdev->ramdisk[count] = '\0';
317 unlock:
318 mutex_unlock(&cdev->cosm_mutex);
319 return count;
320 }
321 static DEVICE_ATTR_RW(ramdisk);
322
323 static ssize_t
bootmode_show(struct device * dev,struct device_attribute * attr,char * buf)324 bootmode_show(struct device *dev, struct device_attribute *attr, char *buf)
325 {
326 struct cosm_device *cdev = dev_get_drvdata(dev);
327 char *bootmode;
328
329 if (!cdev)
330 return -EINVAL;
331
332 bootmode = cdev->bootmode;
333
334 if (bootmode)
335 return scnprintf(buf, PAGE_SIZE, "%s\n", bootmode);
336 return 0;
337 }
338
339 static ssize_t
bootmode_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)340 bootmode_store(struct device *dev, struct device_attribute *attr,
341 const char *buf, size_t count)
342 {
343 struct cosm_device *cdev = dev_get_drvdata(dev);
344
345 if (!cdev)
346 return -EINVAL;
347
348 if (!sysfs_streq(buf, "linux") && !sysfs_streq(buf, "flash"))
349 return -EINVAL;
350
351 mutex_lock(&cdev->cosm_mutex);
352 kfree(cdev->bootmode);
353
354 cdev->bootmode = kmalloc(count + 1, GFP_KERNEL);
355 if (!cdev->bootmode) {
356 count = -ENOMEM;
357 goto unlock;
358 }
359
360 strncpy(cdev->bootmode, buf, count);
361
362 if (cdev->bootmode[count - 1] == '\n')
363 cdev->bootmode[count - 1] = '\0';
364 else
365 cdev->bootmode[count] = '\0';
366 unlock:
367 mutex_unlock(&cdev->cosm_mutex);
368 return count;
369 }
370 static DEVICE_ATTR_RW(bootmode);
371
372 static ssize_t
log_buf_addr_show(struct device * dev,struct device_attribute * attr,char * buf)373 log_buf_addr_show(struct device *dev, struct device_attribute *attr,
374 char *buf)
375 {
376 struct cosm_device *cdev = dev_get_drvdata(dev);
377
378 if (!cdev)
379 return -EINVAL;
380
381 return scnprintf(buf, PAGE_SIZE, "%p\n", cdev->log_buf_addr);
382 }
383
384 static ssize_t
log_buf_addr_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)385 log_buf_addr_store(struct device *dev, struct device_attribute *attr,
386 const char *buf, size_t count)
387 {
388 struct cosm_device *cdev = dev_get_drvdata(dev);
389 int ret;
390 unsigned long addr;
391
392 if (!cdev)
393 return -EINVAL;
394
395 ret = kstrtoul(buf, 16, &addr);
396 if (ret)
397 goto exit;
398
399 cdev->log_buf_addr = (void *)addr;
400 ret = count;
401 exit:
402 return ret;
403 }
404 static DEVICE_ATTR_RW(log_buf_addr);
405
406 static ssize_t
log_buf_len_show(struct device * dev,struct device_attribute * attr,char * buf)407 log_buf_len_show(struct device *dev, struct device_attribute *attr,
408 char *buf)
409 {
410 struct cosm_device *cdev = dev_get_drvdata(dev);
411
412 if (!cdev)
413 return -EINVAL;
414
415 return scnprintf(buf, PAGE_SIZE, "%p\n", cdev->log_buf_len);
416 }
417
418 static ssize_t
log_buf_len_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)419 log_buf_len_store(struct device *dev, struct device_attribute *attr,
420 const char *buf, size_t count)
421 {
422 struct cosm_device *cdev = dev_get_drvdata(dev);
423 int ret;
424 unsigned long addr;
425
426 if (!cdev)
427 return -EINVAL;
428
429 ret = kstrtoul(buf, 16, &addr);
430 if (ret)
431 goto exit;
432
433 cdev->log_buf_len = (int *)addr;
434 ret = count;
435 exit:
436 return ret;
437 }
438 static DEVICE_ATTR_RW(log_buf_len);
439
440 static struct attribute *cosm_default_attrs[] = {
441 &dev_attr_family.attr,
442 &dev_attr_stepping.attr,
443 &dev_attr_state.attr,
444 &dev_attr_shutdown_status.attr,
445 &dev_attr_heartbeat_enable.attr,
446 &dev_attr_cmdline.attr,
447 &dev_attr_firmware.attr,
448 &dev_attr_ramdisk.attr,
449 &dev_attr_bootmode.attr,
450 &dev_attr_log_buf_addr.attr,
451 &dev_attr_log_buf_len.attr,
452
453 NULL
454 };
455
456 ATTRIBUTE_GROUPS(cosm_default);
457
cosm_sysfs_init(struct cosm_device * cdev)458 void cosm_sysfs_init(struct cosm_device *cdev)
459 {
460 cdev->attr_group = cosm_default_groups;
461 }
462