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 */ 416