drivers/misc/mic/cosm/cosm_sysfs.c

   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
  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
  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
  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
  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
  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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 458 void cosm_sysfs_init(struct cosm_device *cdev)
 459 {
 460         cdev->attr_group = cosm_default_groups;
 461 }