drivers/misc/mic/host/mic_sysfs.c

   1 /*
   2  * Intel MIC Platform Software Stack (MPSS)
   3  *
   4  * Copyright(c) 2013 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 Host driver.
  19  *
  20  */
  21 #include <linux/pci.h>
  22
  23 #include <linux/mic_common.h>
  24 #include "../common/mic_dev.h"
  25 #include "mic_device.h"
  26
  27 /*
  28  * A state-to-string lookup table, for exposing a human readable state
  29  * via sysfs. Always keep in sync with enum mic_states
  30  */
  31 static const char * const mic_state_string[] = {
  32         [MIC_OFFLINE] = "offline",
  33         [MIC_ONLINE] = "online",
  34         [MIC_SHUTTING_DOWN] = "shutting_down",
  35         [MIC_RESET_FAILED] = "reset_failed",
  36         [MIC_SUSPENDING] = "suspending",
  37         [MIC_SUSPENDED] = "suspended",
  38 };
  39
  40 /*
  41  * A shutdown-status-to-string lookup table, for exposing a human
  42  * readable state via sysfs. Always keep in sync with enum mic_shutdown_status
  43  */
  44 static const char * const mic_shutdown_status_string[] = {
  45         [MIC_NOP] = "nop",
  46         [MIC_CRASHED] = "crashed",
  47         [MIC_HALTED] = "halted",
  48         [MIC_POWER_OFF] = "poweroff",
  49         [MIC_RESTART] = "restart",
  50 };
  51
  52 void mic_set_shutdown_status(struct mic_device *mdev, u8 shutdown_status)
  53 {
  54         dev_dbg(mdev->sdev->parent, "Shutdown Status %s -> %s\n",
  55                 mic_shutdown_status_string[mdev->shutdown_status],
  56                 mic_shutdown_status_string[shutdown_status]);
  57         mdev->shutdown_status = shutdown_status;
  58 }
  59
  60 void mic_set_state(struct mic_device *mdev, u8 state)
  61 {
  62         dev_dbg(mdev->sdev->parent, "State %s -> %s\n",
  63                 mic_state_string[mdev->state],
  64                 mic_state_string[state]);
  65         mdev->state = state;
  66         sysfs_notify_dirent(mdev->state_sysfs);
  67 }
  68
  69 static ssize_t
  70 family_show(struct device *dev, struct device_attribute *attr, char *buf)
  71 {
  72         static const char x100[] = "x100";
  73         static const char unknown[] = "Unknown";
  74         const char *card = NULL;
  75         struct mic_device *mdev = dev_get_drvdata(dev->parent);
  76
  77         if (!mdev)
  78                 return -EINVAL;
  79
  80         switch (mdev->family) {
  81         case MIC_FAMILY_X100:
  82                 card = x100;
  83                 break;
  84         default:
  85                 card = unknown;
  86                 break;
  87         }
  88         return scnprintf(buf, PAGE_SIZE, "%s\n", card);
  89 }
  90 static DEVICE_ATTR_RO(family);
  91
  92 static ssize_t
  93 stepping_show(struct device *dev, struct device_attribute *attr, char *buf)
  94 {
  95         struct mic_device *mdev = dev_get_drvdata(dev->parent);
  96         char *string = "??";
  97
  98         if (!mdev)
  99                 return -EINVAL;
 100
 101         switch (mdev->stepping) {
 102         case MIC_A0_STEP:
 103                 string = "A0";
 104                 break;
 105         case MIC_B0_STEP:
 106                 string = "B0";
 107                 break;
 108         case MIC_B1_STEP:
 109                 string = "B1";
 110                 break;
 111         case MIC_C0_STEP:
 112                 string = "C0";
 113                 break;
 114         default:
 115                 break;
 116         }
 117         return scnprintf(buf, PAGE_SIZE, "%s\n", string);
 118 }
 119 static DEVICE_ATTR_RO(stepping);
 120
 121 static ssize_t
 122 state_show(struct device *dev, struct device_attribute *attr, char *buf)
 123 {
 124         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 125
 126         if (!mdev || mdev->state >= MIC_LAST)
 127                 return -EINVAL;
 128
 129         return scnprintf(buf, PAGE_SIZE, "%s\n",
 130                 mic_state_string[mdev->state]);
 131 }
 132
 133 static ssize_t
 134 state_store(struct device *dev, struct device_attribute *attr,
 135             const char *buf, size_t count)
 136 {
 137         int rc = 0;
 138         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 139         if (!mdev)
 140                 return -EINVAL;
 141         if (sysfs_streq(buf, "boot")) {
 142                 rc = mic_start(mdev, buf);
 143                 if (rc) {
 144                         dev_err(mdev->sdev->parent,
 145                                 "mic_boot failed rc %d\n", rc);
 146                         count = rc;
 147                 }
 148                 goto done;
 149         }
 150
 151         if (sysfs_streq(buf, "reset")) {
 152                 schedule_work(&mdev->reset_trigger_work);
 153                 goto done;
 154         }
 155
 156         if (sysfs_streq(buf, "shutdown")) {
 157                 mic_shutdown(mdev);
 158                 goto done;
 159         }
 160
 161         if (sysfs_streq(buf, "suspend")) {
 162                 mic_suspend(mdev);
 163                 goto done;
 164         }
 165
 166         count = -EINVAL;
 167 done:
 168         return count;
 169 }
 170 static DEVICE_ATTR_RW(state);
 171
 172 static ssize_t shutdown_status_show(struct device *dev,
 173                                     struct device_attribute *attr, char *buf)
 174 {
 175         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 176
 177         if (!mdev || mdev->shutdown_status >= MIC_STATUS_LAST)
 178                 return -EINVAL;
 179
 180         return scnprintf(buf, PAGE_SIZE, "%s\n",
 181                 mic_shutdown_status_string[mdev->shutdown_status]);
 182 }
 183 static DEVICE_ATTR_RO(shutdown_status);
 184
 185 static ssize_t
 186 cmdline_show(struct device *dev, struct device_attribute *attr, char *buf)
 187 {
 188         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 189         char *cmdline;
 190
 191         if (!mdev)
 192                 return -EINVAL;
 193
 194         cmdline = mdev->cmdline;
 195
 196         if (cmdline)
 197                 return scnprintf(buf, PAGE_SIZE, "%s\n", cmdline);
 198         return 0;
 199 }
 200
 201 static ssize_t
 202 cmdline_store(struct device *dev, struct device_attribute *attr,
 203               const char *buf, size_t count)
 204 {
 205         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 206
 207         if (!mdev)
 208                 return -EINVAL;
 209
 210         mutex_lock(&mdev->mic_mutex);
 211         kfree(mdev->cmdline);
 212
 213         mdev->cmdline = kmalloc(count + 1, GFP_KERNEL);
 214         if (!mdev->cmdline) {
 215                 count = -ENOMEM;
 216                 goto unlock;
 217         }
 218
 219         strncpy(mdev->cmdline, buf, count);
 220
 221         if (mdev->cmdline[count - 1] == '\n')
 222                 mdev->cmdline[count - 1] = '\0';
 223         else
 224                 mdev->cmdline[count] = '\0';
 225 unlock:
 226         mutex_unlock(&mdev->mic_mutex);
 227         return count;
 228 }
 229 static DEVICE_ATTR_RW(cmdline);
 230
 231 static ssize_t
 232 firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
 233 {
 234         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 235         char *firmware;
 236
 237         if (!mdev)
 238                 return -EINVAL;
 239
 240         firmware = mdev->firmware;
 241
 242         if (firmware)
 243                 return scnprintf(buf, PAGE_SIZE, "%s\n", firmware);
 244         return 0;
 245 }
 246
 247 static ssize_t
 248 firmware_store(struct device *dev, struct device_attribute *attr,
 249                const char *buf, size_t count)
 250 {
 251         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 252
 253         if (!mdev)
 254                 return -EINVAL;
 255
 256         mutex_lock(&mdev->mic_mutex);
 257         kfree(mdev->firmware);
 258
 259         mdev->firmware = kmalloc(count + 1, GFP_KERNEL);
 260         if (!mdev->firmware) {
 261                 count = -ENOMEM;
 262                 goto unlock;
 263         }
 264         strncpy(mdev->firmware, buf, count);
 265
 266         if (mdev->firmware[count - 1] == '\n')
 267                 mdev->firmware[count - 1] = '\0';
 268         else
 269                 mdev->firmware[count] = '\0';
 270 unlock:
 271         mutex_unlock(&mdev->mic_mutex);
 272         return count;
 273 }
 274 static DEVICE_ATTR_RW(firmware);
 275
 276 static ssize_t
 277 ramdisk_show(struct device *dev, struct device_attribute *attr, char *buf)
 278 {
 279         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 280         char *ramdisk;
 281
 282         if (!mdev)
 283                 return -EINVAL;
 284
 285         ramdisk = mdev->ramdisk;
 286
 287         if (ramdisk)
 288                 return scnprintf(buf, PAGE_SIZE, "%s\n", ramdisk);
 289         return 0;
 290 }
 291
 292 static ssize_t
 293 ramdisk_store(struct device *dev, struct device_attribute *attr,
 294               const char *buf, size_t count)
 295 {
 296         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 297
 298         if (!mdev)
 299                 return -EINVAL;
 300
 301         mutex_lock(&mdev->mic_mutex);
 302         kfree(mdev->ramdisk);
 303
 304         mdev->ramdisk = kmalloc(count + 1, GFP_KERNEL);
 305         if (!mdev->ramdisk) {
 306                 count = -ENOMEM;
 307                 goto unlock;
 308         }
 309
 310         strncpy(mdev->ramdisk, buf, count);
 311
 312         if (mdev->ramdisk[count - 1] == '\n')
 313                 mdev->ramdisk[count - 1] = '\0';
 314         else
 315                 mdev->ramdisk[count] = '\0';
 316 unlock:
 317         mutex_unlock(&mdev->mic_mutex);
 318         return count;
 319 }
 320 static DEVICE_ATTR_RW(ramdisk);
 321
 322 static ssize_t
 323 bootmode_show(struct device *dev, struct device_attribute *attr, char *buf)
 324 {
 325         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 326         char *bootmode;
 327
 328         if (!mdev)
 329                 return -EINVAL;
 330
 331         bootmode = mdev->bootmode;
 332
 333         if (bootmode)
 334                 return scnprintf(buf, PAGE_SIZE, "%s\n", bootmode);
 335         return 0;
 336 }
 337
 338 static ssize_t
 339 bootmode_store(struct device *dev, struct device_attribute *attr,
 340                const char *buf, size_t count)
 341 {
 342         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 343
 344         if (!mdev)
 345                 return -EINVAL;
 346
 347         if (!sysfs_streq(buf, "linux") && !sysfs_streq(buf, "elf"))
 348                 return -EINVAL;
 349
 350         mutex_lock(&mdev->mic_mutex);
 351         kfree(mdev->bootmode);
 352
 353         mdev->bootmode = kmalloc(count + 1, GFP_KERNEL);
 354         if (!mdev->bootmode) {
 355                 count = -ENOMEM;
 356                 goto unlock;
 357         }
 358
 359         strncpy(mdev->bootmode, buf, count);
 360
 361         if (mdev->bootmode[count - 1] == '\n')
 362                 mdev->bootmode[count - 1] = '\0';
 363         else
 364                 mdev->bootmode[count] = '\0';
 365 unlock:
 366         mutex_unlock(&mdev->mic_mutex);
 367         return count;
 368 }
 369 static DEVICE_ATTR_RW(bootmode);
 370
 371 static ssize_t
 372 log_buf_addr_show(struct device *dev, struct device_attribute *attr,
 373                   char *buf)
 374 {
 375         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 376
 377         if (!mdev)
 378                 return -EINVAL;
 379
 380         return scnprintf(buf, PAGE_SIZE, "%p\n", mdev->log_buf_addr);
 381 }
 382
 383 static ssize_t
 384 log_buf_addr_store(struct device *dev, struct device_attribute *attr,
 385                    const char *buf, size_t count)
 386 {
 387         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 388         int ret;
 389         unsigned long addr;
 390
 391         if (!mdev)
 392                 return -EINVAL;
 393
 394         ret = kstrtoul(buf, 16, &addr);
 395         if (ret)
 396                 goto exit;
 397
 398         mdev->log_buf_addr = (void *)addr;
 399         ret = count;
 400 exit:
 401         return ret;
 402 }
 403 static DEVICE_ATTR_RW(log_buf_addr);
 404
 405 static ssize_t
 406 log_buf_len_show(struct device *dev, struct device_attribute *attr,
 407                  char *buf)
 408 {
 409         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 410
 411         if (!mdev)
 412                 return -EINVAL;
 413
 414         return scnprintf(buf, PAGE_SIZE, "%p\n", mdev->log_buf_len);
 415 }
 416
 417 static ssize_t
 418 log_buf_len_store(struct device *dev, struct device_attribute *attr,
 419                   const char *buf, size_t count)
 420 {
 421         struct mic_device *mdev = dev_get_drvdata(dev->parent);
 422         int ret;
 423         unsigned long addr;
 424
 425         if (!mdev)
 426                 return -EINVAL;
 427
 428         ret = kstrtoul(buf, 16, &addr);
 429         if (ret)
 430                 goto exit;
 431
 432         mdev->log_buf_len = (int *)addr;
 433         ret = count;
 434 exit:
 435         return ret;
 436 }
 437 static DEVICE_ATTR_RW(log_buf_len);
 438
 439 static struct attribute *mic_default_attrs[] = {
 440         &dev_attr_family.attr,
 441         &dev_attr_stepping.attr,
 442         &dev_attr_state.attr,
 443         &dev_attr_shutdown_status.attr,
 444         &dev_attr_cmdline.attr,
 445         &dev_attr_firmware.attr,
 446         &dev_attr_ramdisk.attr,
 447         &dev_attr_bootmode.attr,
 448         &dev_attr_log_buf_addr.attr,
 449         &dev_attr_log_buf_len.attr,
 450
 451         NULL
 452 };
 453
 454 ATTRIBUTE_GROUPS(mic_default);
 455
 456 void mic_sysfs_init(struct mic_device *mdev)
 457 {
 458         mdev->attr_group = mic_default_groups;
 459 }