drivers/net/ethernet/sfc/mcdi_mon.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2011 Solarflare Communications Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published
   7  * by the Free Software Foundation, incorporated herein by reference.
   8  */
   9
  10 #include <linux/bitops.h>
  11 #include <linux/slab.h>
  12 #include <linux/hwmon.h>
  13 #include <linux/stat.h>
  14
  15 #include "net_driver.h"
  16 #include "mcdi.h"
  17 #include "mcdi_pcol.h"
  18 #include "nic.h"
  19
  20 enum efx_hwmon_type {
  21         EFX_HWMON_UNKNOWN,
  22         EFX_HWMON_TEMP,         /* temperature */
  23         EFX_HWMON_COOL,         /* cooling device, probably a heatsink */
  24         EFX_HWMON_IN            /* input voltage */
  25 };
  26
  27 static const struct {
  28         const char *label;
  29         enum efx_hwmon_type hwmon_type;
  30         int port;
  31 } efx_mcdi_sensor_type[MC_CMD_SENSOR_ENTRY_MAXNUM] = {
  32 #define SENSOR(name, label, hwmon_type, port)                   \
  33         [MC_CMD_SENSOR_##name] = { label, hwmon_type, port }
  34         SENSOR(CONTROLLER_TEMP,    "Controller temp.",     EFX_HWMON_TEMP, -1),
  35         SENSOR(PHY_COMMON_TEMP,    "PHY temp.",            EFX_HWMON_TEMP, -1),
  36         SENSOR(CONTROLLER_COOLING, "Controller cooling",   EFX_HWMON_COOL, -1),
  37         SENSOR(PHY0_TEMP,          "PHY temp.",            EFX_HWMON_TEMP, 0),
  38         SENSOR(PHY0_COOLING,       "PHY cooling",          EFX_HWMON_COOL, 0),
  39         SENSOR(PHY1_TEMP,          "PHY temp.",            EFX_HWMON_TEMP, 1),
  40         SENSOR(PHY1_COOLING,       "PHY cooling",          EFX_HWMON_COOL, 1),
  41         SENSOR(IN_1V0,             "1.0V supply",          EFX_HWMON_IN,   -1),
  42         SENSOR(IN_1V2,             "1.2V supply",          EFX_HWMON_IN,   -1),
  43         SENSOR(IN_1V8,             "1.8V supply",          EFX_HWMON_IN,   -1),
  44         SENSOR(IN_2V5,             "2.5V supply",          EFX_HWMON_IN,   -1),
  45         SENSOR(IN_3V3,             "3.3V supply",          EFX_HWMON_IN,   -1),
  46         SENSOR(IN_12V0,            "12.0V supply",         EFX_HWMON_IN,   -1),
  47         SENSOR(IN_1V2A,            "1.2V analogue supply", EFX_HWMON_IN,   -1),
  48         SENSOR(IN_VREF,            "ref. voltage",         EFX_HWMON_IN,   -1),
  49 #undef SENSOR
  50 };
  51
  52 static const char *const sensor_status_names[] = {
  53         [MC_CMD_SENSOR_STATE_OK] = "OK",
  54         [MC_CMD_SENSOR_STATE_WARNING] = "Warning",
  55         [MC_CMD_SENSOR_STATE_FATAL] = "Fatal",
  56         [MC_CMD_SENSOR_STATE_BROKEN] = "Device failure",
  57 };
  58
  59 void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev)
  60 {
  61         unsigned int type, state, value;
  62         const char *name = NULL, *state_txt;
  63
  64         type = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_MONITOR);
  65         state = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_STATE);
  66         value = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_VALUE);
  67
  68         /* Deal gracefully with the board having more drivers than we
  69          * know about, but do not expect new sensor states. */
  70         if (type < ARRAY_SIZE(efx_mcdi_sensor_type))
  71                 name = efx_mcdi_sensor_type[type].label;
  72         if (!name)
  73                 name = "No sensor name available";
  74         EFX_BUG_ON_PARANOID(state >= ARRAY_SIZE(sensor_status_names));
  75         state_txt = sensor_status_names[state];
  76
  77         netif_err(efx, hw, efx->net_dev,
  78                   "Sensor %d (%s) reports condition '%s' for raw value %d\n",
  79                   type, name, state_txt, value);
  80 }
  81
  82 #ifdef CONFIG_SFC_MCDI_MON
  83
  84 struct efx_mcdi_mon_attribute {
  85         struct device_attribute dev_attr;
  86         unsigned int index;
  87         unsigned int type;
  88         unsigned int limit_value;
  89         char name[12];
  90 };
  91
  92 static int efx_mcdi_mon_update(struct efx_nic *efx)
  93 {
  94         struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
  95         u8 inbuf[MC_CMD_READ_SENSORS_IN_LEN];
  96         int rc;
  97
  98         MCDI_SET_DWORD(inbuf, READ_SENSORS_IN_DMA_ADDR_LO,
  99                        hwmon->dma_buf.dma_addr & 0xffffffff);
 100         MCDI_SET_DWORD(inbuf, READ_SENSORS_IN_DMA_ADDR_HI,
 101                        (u64)hwmon->dma_buf.dma_addr >> 32);
 102
 103         rc = efx_mcdi_rpc(efx, MC_CMD_READ_SENSORS,
 104                           inbuf, sizeof(inbuf), NULL, 0, NULL);
 105         if (rc == 0)
 106                 hwmon->last_update = jiffies;
 107         return rc;
 108 }
 109
 110 static ssize_t efx_mcdi_mon_show_name(struct device *dev,
 111                                       struct device_attribute *attr,
 112                                       char *buf)
 113 {
 114         return sprintf(buf, "%s\n", KBUILD_MODNAME);
 115 }
 116
 117 static int efx_mcdi_mon_get_entry(struct device *dev, unsigned int index,
 118                                   efx_dword_t *entry)
 119 {
 120         struct efx_nic *efx = dev_get_drvdata(dev);
 121         struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
 122         int rc;
 123
 124         BUILD_BUG_ON(MC_CMD_READ_SENSORS_OUT_LEN != 0);
 125
 126         mutex_lock(&hwmon->update_lock);
 127
 128         /* Use cached value if last update was < 1 s ago */
 129         if (time_before(jiffies, hwmon->last_update + HZ))
 130                 rc = 0;
 131         else
 132                 rc = efx_mcdi_mon_update(efx);
 133
 134         /* Copy out the requested entry */
 135         *entry = ((efx_dword_t *)hwmon->dma_buf.addr)[index];
 136
 137         mutex_unlock(&hwmon->update_lock);
 138
 139         return rc;
 140 }
 141
 142 static ssize_t efx_mcdi_mon_show_value(struct device *dev,
 143                                        struct device_attribute *attr,
 144                                        char *buf)
 145 {
 146         struct efx_mcdi_mon_attribute *mon_attr =
 147                 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
 148         efx_dword_t entry;
 149         unsigned int value;
 150         int rc;
 151
 152         rc = efx_mcdi_mon_get_entry(dev, mon_attr->index, &entry);
 153         if (rc)
 154                 return rc;
 155
 156         value = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_VALUE);
 157
 158         /* Convert temperature from degrees to milli-degrees Celsius */
 159         if (efx_mcdi_sensor_type[mon_attr->type].hwmon_type == EFX_HWMON_TEMP)
 160                 value *= 1000;
 161
 162         return sprintf(buf, "%u\n", value);
 163 }
 164
 165 static ssize_t efx_mcdi_mon_show_limit(struct device *dev,
 166                                        struct device_attribute *attr,
 167                                        char *buf)
 168 {
 169         struct efx_mcdi_mon_attribute *mon_attr =
 170                 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
 171         unsigned int value;
 172
 173         value = mon_attr->limit_value;
 174
 175         /* Convert temperature from degrees to milli-degrees Celsius */
 176         if (efx_mcdi_sensor_type[mon_attr->type].hwmon_type == EFX_HWMON_TEMP)
 177                 value *= 1000;
 178
 179         return sprintf(buf, "%u\n", value);
 180 }
 181
 182 static ssize_t efx_mcdi_mon_show_alarm(struct device *dev,
 183                                        struct device_attribute *attr,
 184                                        char *buf)
 185 {
 186         struct efx_mcdi_mon_attribute *mon_attr =
 187                 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
 188         efx_dword_t entry;
 189         int state;
 190         int rc;
 191
 192         rc = efx_mcdi_mon_get_entry(dev, mon_attr->index, &entry);
 193         if (rc)
 194                 return rc;
 195
 196         state = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_STATE);
 197         return sprintf(buf, "%d\n", state != MC_CMD_SENSOR_STATE_OK);
 198 }
 199
 200 static ssize_t efx_mcdi_mon_show_label(struct device *dev,
 201                                        struct device_attribute *attr,
 202                                        char *buf)
 203 {
 204         struct efx_mcdi_mon_attribute *mon_attr =
 205                 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
 206         return sprintf(buf, "%s\n",
 207                        efx_mcdi_sensor_type[mon_attr->type].label);
 208 }
 209
 210 static int
 211 efx_mcdi_mon_add_attr(struct efx_nic *efx, const char *name,
 212                       ssize_t (*reader)(struct device *,
 213                                         struct device_attribute *, char *),
 214                       unsigned int index, unsigned int type,
 215                       unsigned int limit_value)
 216 {
 217         struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
 218         struct efx_mcdi_mon_attribute *attr = &hwmon->attrs[hwmon->n_attrs];
 219         int rc;
 220
 221         strlcpy(attr->name, name, sizeof(attr->name));
 222         attr->index = index;
 223         attr->type = type;
 224         attr->limit_value = limit_value;
 225         attr->dev_attr.attr.name = attr->name;
 226         attr->dev_attr.attr.mode = S_IRUGO;
 227         attr->dev_attr.show = reader;
 228         rc = device_create_file(&efx->pci_dev->dev, &attr->dev_attr);
 229         if (rc == 0)
 230                 ++hwmon->n_attrs;
 231         return rc;
 232 }
 233
 234 int efx_mcdi_mon_probe(struct efx_nic *efx)
 235 {
 236         struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
 237         unsigned int n_attrs, n_temp = 0, n_cool = 0, n_in = 0;
 238         u8 outbuf[MC_CMD_SENSOR_INFO_OUT_LENMAX];
 239         size_t outlen;
 240         char name[12];
 241         u32 mask;
 242         int rc, i, type;
 243
 244         BUILD_BUG_ON(MC_CMD_SENSOR_INFO_IN_LEN != 0);
 245
 246         rc = efx_mcdi_rpc(efx, MC_CMD_SENSOR_INFO, NULL, 0,
 247                           outbuf, sizeof(outbuf), &outlen);
 248         if (rc)
 249                 return rc;
 250         if (outlen < MC_CMD_SENSOR_INFO_OUT_LENMIN)
 251                 return -EIO;
 252
 253         /* Find out which sensors are present.  Don't create a device
 254          * if there are none.
 255          */
 256         mask = MCDI_DWORD(outbuf, SENSOR_INFO_OUT_MASK);
 257         if (mask == 0)
 258                 return 0;
 259
 260         /* Check again for short response */
 261         if (outlen < MC_CMD_SENSOR_INFO_OUT_LEN(hweight32(mask)))
 262                 return -EIO;
 263
 264         rc = efx_nic_alloc_buffer(efx, &hwmon->dma_buf,
 265                                   4 * MC_CMD_SENSOR_ENTRY_MAXNUM);
 266         if (rc)
 267                 return rc;
 268
 269         mutex_init(&hwmon->update_lock);
 270         efx_mcdi_mon_update(efx);
 271
 272         /* Allocate space for the maximum possible number of
 273          * attributes for this set of sensors: name of the driver plus
 274          * value, min, max, crit, alarm and label for each sensor.
 275          */
 276         n_attrs = 1 + 6 * hweight32(mask);
 277         hwmon->attrs = kcalloc(n_attrs, sizeof(*hwmon->attrs), GFP_KERNEL);
 278         if (!hwmon->attrs) {
 279                 rc = -ENOMEM;
 280                 goto fail;
 281         }
 282
 283         hwmon->device = hwmon_device_register(&efx->pci_dev->dev);
 284         if (IS_ERR(hwmon->device)) {
 285                 rc = PTR_ERR(hwmon->device);
 286                 goto fail;
 287         }
 288
 289         rc = efx_mcdi_mon_add_attr(efx, "name", efx_mcdi_mon_show_name, 0, 0, 0);
 290         if (rc)
 291                 goto fail;
 292
 293         for (i = 0, type = -1; ; i++) {
 294                 const char *hwmon_prefix;
 295                 unsigned hwmon_index;
 296                 u16 min1, max1, min2, max2;
 297
 298                 /* Find next sensor type or exit if there is none */
 299                 type++;
 300                 while (!(mask & (1 << type))) {
 301                         type++;
 302                         if (type == 32)
 303                                 return 0;
 304                 }
 305
 306                 /* Skip sensors specific to a different port */
 307                 if (efx_mcdi_sensor_type[type].hwmon_type != EFX_HWMON_UNKNOWN &&
 308                     efx_mcdi_sensor_type[type].port >= 0 &&
 309                     efx_mcdi_sensor_type[type].port != efx_port_num(efx))
 310                         continue;
 311
 312                 switch (efx_mcdi_sensor_type[type].hwmon_type) {
 313                 case EFX_HWMON_TEMP:
 314                         hwmon_prefix = "temp";
 315                         hwmon_index = ++n_temp; /* 1-based */
 316                         break;
 317                 case EFX_HWMON_COOL:
 318                         /* This is likely to be a heatsink, but there
 319                          * is no convention for representing cooling
 320                          * devices other than fans.
 321                          */
 322                         hwmon_prefix = "fan";
 323                         hwmon_index = ++n_cool; /* 1-based */
 324                         break;
 325                 default:
 326                         hwmon_prefix = "in";
 327                         hwmon_index = n_in++; /* 0-based */
 328                         break;
 329                 }
 330
 331                 min1 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
 332                                         SENSOR_INFO_ENTRY, i, MIN1);
 333                 max1 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
 334                                         SENSOR_INFO_ENTRY, i, MAX1);
 335                 min2 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
 336                                         SENSOR_INFO_ENTRY, i, MIN2);
 337                 max2 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
 338                                         SENSOR_INFO_ENTRY, i, MAX2);
 339
 340                 if (min1 != max1) {
 341                         snprintf(name, sizeof(name), "%s%u_input",
 342                                  hwmon_prefix, hwmon_index);
 343                         rc = efx_mcdi_mon_add_attr(
 344                                 efx, name, efx_mcdi_mon_show_value, i, type, 0);
 345                         if (rc)
 346                                 goto fail;
 347
 348                         snprintf(name, sizeof(name), "%s%u_min",
 349                                  hwmon_prefix, hwmon_index);
 350                         rc = efx_mcdi_mon_add_attr(
 351                                 efx, name, efx_mcdi_mon_show_limit,
 352                                 i, type, min1);
 353                         if (rc)
 354                                 goto fail;
 355
 356                         snprintf(name, sizeof(name), "%s%u_max",
 357                                  hwmon_prefix, hwmon_index);
 358                         rc = efx_mcdi_mon_add_attr(
 359                                 efx, name, efx_mcdi_mon_show_limit,
 360                                 i, type, max1);
 361                         if (rc)
 362                                 goto fail;
 363
 364                         if (min2 != max2) {
 365                                 /* Assume max2 is critical value.
 366                                  * But we have no good way to expose min2.
 367                                  */
 368                                 snprintf(name, sizeof(name), "%s%u_crit",
 369                                          hwmon_prefix, hwmon_index);
 370                                 rc = efx_mcdi_mon_add_attr(
 371                                         efx, name, efx_mcdi_mon_show_limit,
 372                                         i, type, max2);
 373                                 if (rc)
 374                                         goto fail;
 375                         }
 376                 }
 377
 378                 snprintf(name, sizeof(name), "%s%u_alarm",
 379                          hwmon_prefix, hwmon_index);
 380                 rc = efx_mcdi_mon_add_attr(
 381                         efx, name, efx_mcdi_mon_show_alarm, i, type, 0);
 382                 if (rc)
 383                         goto fail;
 384
 385                 if (efx_mcdi_sensor_type[type].label) {
 386                         snprintf(name, sizeof(name), "%s%u_label",
 387                                  hwmon_prefix, hwmon_index);
 388                         rc = efx_mcdi_mon_add_attr(
 389                                 efx, name, efx_mcdi_mon_show_label, i, type, 0);
 390                         if (rc)
 391                                 goto fail;
 392                 }
 393         }
 394
 395 fail:
 396         efx_mcdi_mon_remove(efx);
 397         return rc;
 398 }
 399
 400 void efx_mcdi_mon_remove(struct efx_nic *efx)
 401 {
 402         struct siena_nic_data *nic_data = efx->nic_data;
 403         struct efx_mcdi_mon *hwmon = &nic_data->hwmon;
 404         unsigned int i;
 405
 406         for (i = 0; i < hwmon->n_attrs; i++)
 407                 device_remove_file(&efx->pci_dev->dev,
 408                                    &hwmon->attrs[i].dev_attr);
 409         kfree(hwmon->attrs);
 410         if (hwmon->device)
 411                 hwmon_device_unregister(hwmon->device);
 412         efx_nic_free_buffer(efx, &hwmon->dma_buf);
 413 }
 414
 415 #endif /* CONFIG_SFC_MCDI_MON */