drivers/mmc/core/debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Debugfs support for hosts and cards
   4  *
   5  * Copyright (C) 2008 Atmel Corporation
   6  */
   7 #include <linux/moduleparam.h>
   8 #include <linux/export.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/fs.h>
  11 #include <linux/seq_file.h>
  12 #include <linux/slab.h>
  13 #include <linux/stat.h>
  14 #include <linux/fault-inject.h>
  15 #include <linux/time.h>
  16
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/host.h>
  19 #include <linux/mmc/mmc.h>
  20 #include <linux/mmc/sd.h>
  21
  22 #include "core.h"
  23 #include "card.h"
  24 #include "host.h"
  25 #include "mmc_ops.h"
  26
  27 #ifdef CONFIG_FAIL_MMC_REQUEST
  28
  29 static DECLARE_FAULT_ATTR(fail_default_attr);
  30 static char *fail_request;
  31 module_param(fail_request, charp, 0);
  32 MODULE_PARM_DESC(fail_request, "default fault injection attributes");
  33
  34 #endif /* CONFIG_FAIL_MMC_REQUEST */
  35
  36 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
  37 static int mmc_ios_show(struct seq_file *s, void *data)
  38 {
  39         static const char *vdd_str[] = {
  40                 [8]     = "2.0",
  41                 [9]     = "2.1",
  42                 [10]    = "2.2",
  43                 [11]    = "2.3",
  44                 [12]    = "2.4",
  45                 [13]    = "2.5",
  46                 [14]    = "2.6",
  47                 [15]    = "2.7",
  48                 [16]    = "2.8",
  49                 [17]    = "2.9",
  50                 [18]    = "3.0",
  51                 [19]    = "3.1",
  52                 [20]    = "3.2",
  53                 [21]    = "3.3",
  54                 [22]    = "3.4",
  55                 [23]    = "3.5",
  56                 [24]    = "3.6",
  57         };
  58         struct mmc_host *host = s->private;
  59         struct mmc_ios  *ios = &host->ios;
  60         const char *str;
  61
  62         seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
  63         if (host->actual_clock)
  64                 seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
  65         seq_printf(s, "vdd:\t\t%u ", ios->vdd);
  66         if ((1 << ios->vdd) & MMC_VDD_165_195)
  67                 seq_printf(s, "(1.65 - 1.95 V)\n");
  68         else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
  69                         && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
  70                 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
  71                                 vdd_str[ios->vdd + 1]);
  72         else
  73                 seq_printf(s, "(invalid)\n");
  74
  75         switch (ios->bus_mode) {
  76         case MMC_BUSMODE_OPENDRAIN:
  77                 str = "open drain";
  78                 break;
  79         case MMC_BUSMODE_PUSHPULL:
  80                 str = "push-pull";
  81                 break;
  82         default:
  83                 str = "invalid";
  84                 break;
  85         }
  86         seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
  87
  88         switch (ios->chip_select) {
  89         case MMC_CS_DONTCARE:
  90                 str = "don't care";
  91                 break;
  92         case MMC_CS_HIGH:
  93                 str = "active high";
  94                 break;
  95         case MMC_CS_LOW:
  96                 str = "active low";
  97                 break;
  98         default:
  99                 str = "invalid";
 100                 break;
 101         }
 102         seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
 103
 104         switch (ios->power_mode) {
 105         case MMC_POWER_OFF:
 106                 str = "off";
 107                 break;
 108         case MMC_POWER_UP:
 109                 str = "up";
 110                 break;
 111         case MMC_POWER_ON:
 112                 str = "on";
 113                 break;
 114         default:
 115                 str = "invalid";
 116                 break;
 117         }
 118         seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
 119         seq_printf(s, "bus width:\t%u (%u bits)\n",
 120                         ios->bus_width, 1 << ios->bus_width);
 121
 122         switch (ios->timing) {
 123         case MMC_TIMING_LEGACY:
 124                 str = "legacy";
 125                 break;
 126         case MMC_TIMING_MMC_HS:
 127                 str = "mmc high-speed";
 128                 break;
 129         case MMC_TIMING_SD_HS:
 130                 str = "sd high-speed";
 131                 break;
 132         case MMC_TIMING_UHS_SDR12:
 133                 str = "sd uhs SDR12";
 134                 break;
 135         case MMC_TIMING_UHS_SDR25:
 136                 str = "sd uhs SDR25";
 137                 break;
 138         case MMC_TIMING_UHS_SDR50:
 139                 str = "sd uhs SDR50";
 140                 break;
 141         case MMC_TIMING_UHS_SDR104:
 142                 str = "sd uhs SDR104";
 143                 break;
 144         case MMC_TIMING_UHS_DDR50:
 145                 str = "sd uhs DDR50";
 146                 break;
 147         case MMC_TIMING_MMC_DDR52:
 148                 str = "mmc DDR52";
 149                 break;
 150         case MMC_TIMING_MMC_HS200:
 151                 str = "mmc HS200";
 152                 break;
 153         case MMC_TIMING_MMC_HS400:
 154                 str = mmc_card_hs400es(host->card) ?
 155                         "mmc HS400 enhanced strobe" : "mmc HS400";
 156                 break;
 157         default:
 158                 str = "invalid";
 159                 break;
 160         }
 161         seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
 162
 163         switch (ios->signal_voltage) {
 164         case MMC_SIGNAL_VOLTAGE_330:
 165                 str = "3.30 V";
 166                 break;
 167         case MMC_SIGNAL_VOLTAGE_180:
 168                 str = "1.80 V";
 169                 break;
 170         case MMC_SIGNAL_VOLTAGE_120:
 171                 str = "1.20 V";
 172                 break;
 173         default:
 174                 str = "invalid";
 175                 break;
 176         }
 177         seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
 178
 179         switch (ios->drv_type) {
 180         case MMC_SET_DRIVER_TYPE_A:
 181                 str = "driver type A";
 182                 break;
 183         case MMC_SET_DRIVER_TYPE_B:
 184                 str = "driver type B";
 185                 break;
 186         case MMC_SET_DRIVER_TYPE_C:
 187                 str = "driver type C";
 188                 break;
 189         case MMC_SET_DRIVER_TYPE_D:
 190                 str = "driver type D";
 191                 break;
 192         default:
 193                 str = "invalid";
 194                 break;
 195         }
 196         seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str);
 197
 198         return 0;
 199 }
 200 DEFINE_SHOW_ATTRIBUTE(mmc_ios);
 201
 202 static int mmc_clock_opt_get(void *data, u64 *val)
 203 {
 204         struct mmc_host *host = data;
 205
 206         *val = host->ios.clock;
 207
 208         return 0;
 209 }
 210
 211 static int mmc_clock_opt_set(void *data, u64 val)
 212 {
 213         struct mmc_host *host = data;
 214
 215         /* We need this check due to input value is u64 */
 216         if (val != 0 && (val > host->f_max || val < host->f_min))
 217                 return -EINVAL;
 218
 219         mmc_claim_host(host);
 220         mmc_set_clock(host, (unsigned int) val);
 221         mmc_release_host(host);
 222
 223         return 0;
 224 }
 225
 226 DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
 227         "%llu\n");
 228
 229 static int mmc_err_state_get(void *data, u64 *val)
 230 {
 231         struct mmc_host *host = data;
 232         int i;
 233
 234         if (!host)
 235                 return -EINVAL;
 236
 237         *val = 0;
 238         for (i = 0; i < MMC_ERR_MAX; i++) {
 239                 if (host->err_stats[i]) {
 240                         *val = 1;
 241                         break;
 242                 }
 243         }
 244
 245         return 0;
 246 }
 247
 248 DEFINE_DEBUGFS_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
 249
 250 static int mmc_err_stats_show(struct seq_file *file, void *data)
 251 {
 252         struct mmc_host *host = file->private;
 253         const char *desc[MMC_ERR_MAX] = {
 254                 [MMC_ERR_CMD_TIMEOUT] = "Command Timeout Occurred",
 255                 [MMC_ERR_CMD_CRC] = "Command CRC Errors Occurred",
 256                 [MMC_ERR_DAT_TIMEOUT] = "Data Timeout Occurred",
 257                 [MMC_ERR_DAT_CRC] = "Data CRC Errors Occurred",
 258                 [MMC_ERR_AUTO_CMD] = "Auto-Cmd Error Occurred",
 259                 [MMC_ERR_ADMA] = "ADMA Error Occurred",
 260                 [MMC_ERR_TUNING] = "Tuning Error Occurred",
 261                 [MMC_ERR_CMDQ_RED] = "CMDQ RED Errors",
 262                 [MMC_ERR_CMDQ_GCE] = "CMDQ GCE Errors",
 263                 [MMC_ERR_CMDQ_ICCE] = "CMDQ ICCE Errors",
 264                 [MMC_ERR_REQ_TIMEOUT] = "Request Timedout",
 265                 [MMC_ERR_CMDQ_REQ_TIMEOUT] = "CMDQ Request Timedout",
 266                 [MMC_ERR_ICE_CFG] = "ICE Config Errors",
 267                 [MMC_ERR_CTRL_TIMEOUT] = "Controller Timedout errors",
 268                 [MMC_ERR_UNEXPECTED_IRQ] = "Unexpected IRQ errors",
 269         };
 270         int i;
 271
 272         for (i = 0; i < MMC_ERR_MAX; i++) {
 273                 if (desc[i])
 274                         seq_printf(file, "# %s:\t %d\n",
 275                                         desc[i], host->err_stats[i]);
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int mmc_err_stats_open(struct inode *inode, struct file *file)
 282 {
 283         return single_open(file, mmc_err_stats_show, inode->i_private);
 284 }
 285
 286 static ssize_t mmc_err_stats_write(struct file *filp, const char __user *ubuf,
 287                                    size_t cnt, loff_t *ppos)
 288 {
 289         struct mmc_host *host = filp->f_mapping->host->i_private;
 290
 291         pr_debug("%s: Resetting MMC error statistics\n", __func__);
 292         memset(host->err_stats, 0, sizeof(host->err_stats));
 293
 294         return cnt;
 295 }
 296
 297 static const struct file_operations mmc_err_stats_fops = {
 298         .open   = mmc_err_stats_open,
 299         .read   = seq_read,
 300         .write  = mmc_err_stats_write,
 301         .release = single_release,
 302 };
 303
 304 static int mmc_caps_get(void *data, u64 *val)
 305 {
 306         *val = *(u32 *)data;
 307         return 0;
 308 }
 309
 310 static int mmc_caps_set(void *data, u64 val)
 311 {
 312         u32 *caps = data;
 313         u32 diff = *caps ^ val;
 314         u32 allowed = MMC_CAP_AGGRESSIVE_PM |
 315                       MMC_CAP_SD_HIGHSPEED |
 316                       MMC_CAP_MMC_HIGHSPEED |
 317                       MMC_CAP_UHS |
 318                       MMC_CAP_DDR;
 319
 320         if (diff & ~allowed)
 321                 return -EINVAL;
 322
 323         *caps = val;
 324
 325         return 0;
 326 }
 327
 328 static int mmc_caps2_set(void *data, u64 val)
 329 {
 330         u32 allowed = MMC_CAP2_HSX00_1_8V | MMC_CAP2_HSX00_1_2V;
 331         u32 *caps = data;
 332         u32 diff = *caps ^ val;
 333
 334         if (diff & ~allowed)
 335                 return -EINVAL;
 336
 337         *caps = val;
 338
 339         return 0;
 340 }
 341
 342 DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps_fops, mmc_caps_get, mmc_caps_set,
 343                          "0x%08llx\n");
 344 DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps2_fops, mmc_caps_get, mmc_caps2_set,
 345                          "0x%08llx\n");
 346
 347 void mmc_add_host_debugfs(struct mmc_host *host)
 348 {
 349         struct dentry *root;
 350
 351         root = debugfs_create_dir(mmc_hostname(host), NULL);
 352         host->debugfs_root = root;
 353
 354         debugfs_create_file("ios", 0400, root, host, &mmc_ios_fops);
 355         debugfs_create_file("caps", 0600, root, &host->caps, &mmc_caps_fops);
 356         debugfs_create_file("caps2", 0600, root, &host->caps2,
 357                             &mmc_caps2_fops);
 358         debugfs_create_file_unsafe("clock", 0600, root, host,
 359                                    &mmc_clock_fops);
 360
 361         debugfs_create_file_unsafe("err_state", 0600, root, host,
 362                             &mmc_err_state);
 363         debugfs_create_file("err_stats", 0600, root, host,
 364                             &mmc_err_stats_fops);
 365
 366 #ifdef CONFIG_FAIL_MMC_REQUEST
 367         if (fail_request)
 368                 setup_fault_attr(&fail_default_attr, fail_request);
 369         host->fail_mmc_request = fail_default_attr;
 370         fault_create_debugfs_attr("fail_mmc_request", root,
 371                                   &host->fail_mmc_request);
 372 #endif
 373 }
 374
 375 void mmc_remove_host_debugfs(struct mmc_host *host)
 376 {
 377         debugfs_remove_recursive(host->debugfs_root);
 378 }
 379
 380 void mmc_add_card_debugfs(struct mmc_card *card)
 381 {
 382         struct mmc_host *host = card->host;
 383         struct dentry   *root;
 384
 385         if (!host->debugfs_root)
 386                 return;
 387
 388         root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
 389         card->debugfs_root = root;
 390
 391         debugfs_create_x32("state", 0400, root, &card->state);
 392         debugfs_create_x32("quirks", 0400, root, &card->quirks);
 393 }
 394
 395 void mmc_remove_card_debugfs(struct mmc_card *card)
 396 {
 397         debugfs_remove_recursive(card->debugfs_root);
 398         card->debugfs_root = NULL;
 399 }