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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / ethernet / sfc / mcdi_mon.c
blob5954fcfee2b16f354ebfa15ef5c21de7c7a3874f
1 // SPDX-License-Identifier: GPL-2.0-only
2 /****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2011-2013 Solarflare Communications Inc.
5 */
6
7 #include <linux/bitops.h>
8 #include <linux/slab.h>
9 #include <linux/hwmon.h>
10 #include <linux/stat.h>
11
12 #include "net_driver.h"
13 #include "mcdi.h"
14 #include "mcdi_pcol.h"
15 #include "nic.h"
16
17 enum efx_hwmon_type {
18 EFX_HWMON_UNKNOWN,
19 EFX_HWMON_TEMP, /* temperature */
20 EFX_HWMON_COOL, /* cooling device, probably a heatsink */
21 EFX_HWMON_IN, /* voltage */
22 EFX_HWMON_CURR, /* current */
23 EFX_HWMON_POWER, /* power */
24 EFX_HWMON_TYPES_COUNT
25 };
26
27 static const char *const efx_hwmon_unit[EFX_HWMON_TYPES_COUNT] = {
28 [EFX_HWMON_TEMP] = " degC",
29 [EFX_HWMON_COOL] = " rpm", /* though nonsense for a heatsink */
30 [EFX_HWMON_IN] = " mV",
31 [EFX_HWMON_CURR] = " mA",
32 [EFX_HWMON_POWER] = " W",
33 };
34
35 static const struct {
36 const char *label;
37 enum efx_hwmon_type hwmon_type;
38 int port;
39 } efx_mcdi_sensor_type[] = {
40 #define SENSOR(name, label, hwmon_type, port) \
41 [MC_CMD_SENSOR_##name] = { label, EFX_HWMON_ ## hwmon_type, port }
42 SENSOR(CONTROLLER_TEMP, "Controller board temp.", TEMP, -1),
43 SENSOR(PHY_COMMON_TEMP, "PHY temp.", TEMP, -1),
44 SENSOR(CONTROLLER_COOLING, "Controller heat sink", COOL, -1),
45 SENSOR(PHY0_TEMP, "PHY temp.", TEMP, 0),
46 SENSOR(PHY0_COOLING, "PHY heat sink", COOL, 0),
47 SENSOR(PHY1_TEMP, "PHY temp.", TEMP, 1),
48 SENSOR(PHY1_COOLING, "PHY heat sink", COOL, 1),
49 SENSOR(IN_1V0, "1.0V supply", IN, -1),
50 SENSOR(IN_1V2, "1.2V supply", IN, -1),
51 SENSOR(IN_1V8, "1.8V supply", IN, -1),
52 SENSOR(IN_2V5, "2.5V supply", IN, -1),
53 SENSOR(IN_3V3, "3.3V supply", IN, -1),
54 SENSOR(IN_12V0, "12.0V supply", IN, -1),
55 SENSOR(IN_1V2A, "1.2V analogue supply", IN, -1),
56 SENSOR(IN_VREF, "Ref. voltage", IN, -1),
57 SENSOR(OUT_VAOE, "AOE FPGA supply", IN, -1),
58 SENSOR(AOE_TEMP, "AOE FPGA temp.", TEMP, -1),
59 SENSOR(PSU_AOE_TEMP, "AOE regulator temp.", TEMP, -1),
60 SENSOR(PSU_TEMP, "Controller regulator temp.",
61 TEMP, -1),
62 SENSOR(FAN_0, "Fan 0", COOL, -1),
63 SENSOR(FAN_1, "Fan 1", COOL, -1),
64 SENSOR(FAN_2, "Fan 2", COOL, -1),
65 SENSOR(FAN_3, "Fan 3", COOL, -1),
66 SENSOR(FAN_4, "Fan 4", COOL, -1),
67 SENSOR(IN_VAOE, "AOE input supply", IN, -1),
68 SENSOR(OUT_IAOE, "AOE output current", CURR, -1),
69 SENSOR(IN_IAOE, "AOE input current", CURR, -1),
70 SENSOR(NIC_POWER, "Board power use", POWER, -1),
71 SENSOR(IN_0V9, "0.9V supply", IN, -1),
72 SENSOR(IN_I0V9, "0.9V supply current", CURR, -1),
73 SENSOR(IN_I1V2, "1.2V supply current", CURR, -1),
74 SENSOR(IN_0V9_ADC, "0.9V supply (ext. ADC)", IN, -1),
75 SENSOR(CONTROLLER_2_TEMP, "Controller board temp. 2", TEMP, -1),
76 SENSOR(VREG_INTERNAL_TEMP, "Regulator die temp.", TEMP, -1),
77 SENSOR(VREG_0V9_TEMP, "0.9V regulator temp.", TEMP, -1),
78 SENSOR(VREG_1V2_TEMP, "1.2V regulator temp.", TEMP, -1),
79 SENSOR(CONTROLLER_VPTAT,
80 "Controller PTAT voltage (int. ADC)", IN, -1),
81 SENSOR(CONTROLLER_INTERNAL_TEMP,
82 "Controller die temp. (int. ADC)", TEMP, -1),
83 SENSOR(CONTROLLER_VPTAT_EXTADC,
84 "Controller PTAT voltage (ext. ADC)", IN, -1),
85 SENSOR(CONTROLLER_INTERNAL_TEMP_EXTADC,
86 "Controller die temp. (ext. ADC)", TEMP, -1),
87 SENSOR(AMBIENT_TEMP, "Ambient temp.", TEMP, -1),
88 SENSOR(AIRFLOW, "Air flow raw", IN, -1),
89 SENSOR(VDD08D_VSS08D_CSR, "0.9V die (int. ADC)", IN, -1),
90 SENSOR(VDD08D_VSS08D_CSR_EXTADC, "0.9V die (ext. ADC)", IN, -1),
91 SENSOR(HOTPOINT_TEMP, "Controller board temp. (hotpoint)", TEMP, -1),
92 #undef SENSOR
93 };
94
95 static const char *const sensor_status_names[] = {
96 [MC_CMD_SENSOR_STATE_OK] = "OK",
97 [MC_CMD_SENSOR_STATE_WARNING] = "Warning",
98 [MC_CMD_SENSOR_STATE_FATAL] = "Fatal",
99 [MC_CMD_SENSOR_STATE_BROKEN] = "Device failure",
100 [MC_CMD_SENSOR_STATE_NO_READING] = "No reading",
101 };
102
103 void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev)
104 {
105 unsigned int type, state, value;
106 enum efx_hwmon_type hwmon_type = EFX_HWMON_UNKNOWN;
107 const char *name = NULL, *state_txt, *unit;
108
109 type = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_MONITOR);
110 state = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_STATE);
111 value = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_VALUE);
112
113 /* Deal gracefully with the board having more drivers than we
114 * know about, but do not expect new sensor states. */
115 if (type < ARRAY_SIZE(efx_mcdi_sensor_type)) {
116 name = efx_mcdi_sensor_type[type].label;
117 hwmon_type = efx_mcdi_sensor_type[type].hwmon_type;
118 }
119 if (!name)
120 name = "No sensor name available";
121 EFX_WARN_ON_PARANOID(state >= ARRAY_SIZE(sensor_status_names));
122 state_txt = sensor_status_names[state];
123 EFX_WARN_ON_PARANOID(hwmon_type >= EFX_HWMON_TYPES_COUNT);
124 unit = efx_hwmon_unit[hwmon_type];
125 if (!unit)
126 unit = "";
127
128 netif_err(efx, hw, efx->net_dev,
129 "Sensor %d (%s) reports condition '%s' for value %d%s\n",
130 type, name, state_txt, value, unit);
131 }
132
133 #ifdef CONFIG_SFC_MCDI_MON
134
135 struct efx_mcdi_mon_attribute {
136 struct device_attribute dev_attr;
137 unsigned int index;
138 unsigned int type;
139 enum efx_hwmon_type hwmon_type;
140 unsigned int limit_value;
141 char name[12];
142 };
143
144 static int efx_mcdi_mon_update(struct efx_nic *efx)
145 {
146 struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
147 MCDI_DECLARE_BUF(inbuf, MC_CMD_READ_SENSORS_EXT_IN_LEN);
148 int rc;
149
150 MCDI_SET_QWORD(inbuf, READ_SENSORS_EXT_IN_DMA_ADDR,
151 hwmon->dma_buf.dma_addr);
152 MCDI_SET_DWORD(inbuf, READ_SENSORS_EXT_IN_LENGTH, hwmon->dma_buf.len);
153
154 rc = efx_mcdi_rpc(efx, MC_CMD_READ_SENSORS,
155 inbuf, sizeof(inbuf), NULL, 0, NULL);
156 if (rc == 0)
157 hwmon->last_update = jiffies;
158 return rc;
159 }
160
161 static int efx_mcdi_mon_get_entry(struct device *dev, unsigned int index,
162 efx_dword_t *entry)
163 {
164 struct efx_nic *efx = dev_get_drvdata(dev->parent);
165 struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
166 int rc;
167
168 BUILD_BUG_ON(MC_CMD_READ_SENSORS_OUT_LEN != 0);
169
170 mutex_lock(&hwmon->update_lock);
171
172 /* Use cached value if last update was < 1 s ago */
173 if (time_before(jiffies, hwmon->last_update + HZ))
174 rc = 0;
175 else
176 rc = efx_mcdi_mon_update(efx);
177
178 /* Copy out the requested entry */
179 *entry = ((efx_dword_t *)hwmon->dma_buf.addr)[index];
180
181 mutex_unlock(&hwmon->update_lock);
182
183 return rc;
184 }
185
186 static ssize_t efx_mcdi_mon_show_value(struct device *dev,
187 struct device_attribute *attr,
188 char *buf)
189 {
190 struct efx_mcdi_mon_attribute *mon_attr =
191 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
192 efx_dword_t entry;
193 unsigned int value, state;
194 int rc;
195
196 rc = efx_mcdi_mon_get_entry(dev, mon_attr->index, &entry);
197 if (rc)
198 return rc;
199
200 state = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_STATE);
201 if (state == MC_CMD_SENSOR_STATE_NO_READING)
202 return -EBUSY;
203
204 value = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_VALUE);
205
206 switch (mon_attr->hwmon_type) {
207 case EFX_HWMON_TEMP:
208 /* Convert temperature from degrees to milli-degrees Celsius */
209 value *= 1000;
210 break;
211 case EFX_HWMON_POWER:
212 /* Convert power from watts to microwatts */
213 value *= 1000000;
214 break;
215 default:
216 /* No conversion needed */
217 break;
218 }
219
220 return sprintf(buf, "%u\n", value);
221 }
222
223 static ssize_t efx_mcdi_mon_show_limit(struct device *dev,
224 struct device_attribute *attr,
225 char *buf)
226 {
227 struct efx_mcdi_mon_attribute *mon_attr =
228 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
229 unsigned int value;
230
231 value = mon_attr->limit_value;
232
233 switch (mon_attr->hwmon_type) {
234 case EFX_HWMON_TEMP:
235 /* Convert temperature from degrees to milli-degrees Celsius */
236 value *= 1000;
237 break;
238 case EFX_HWMON_POWER:
239 /* Convert power from watts to microwatts */
240 value *= 1000000;
241 break;
242 default:
243 /* No conversion needed */
244 break;
245 }
246
247 return sprintf(buf, "%u\n", value);
248 }
249
250 static ssize_t efx_mcdi_mon_show_alarm(struct device *dev,
251 struct device_attribute *attr,
252 char *buf)
253 {
254 struct efx_mcdi_mon_attribute *mon_attr =
255 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
256 efx_dword_t entry;
257 int state;
258 int rc;
259
260 rc = efx_mcdi_mon_get_entry(dev, mon_attr->index, &entry);
261 if (rc)
262 return rc;
263
264 state = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_STATE);
265 return sprintf(buf, "%d\n", state != MC_CMD_SENSOR_STATE_OK);
266 }
267
268 static ssize_t efx_mcdi_mon_show_label(struct device *dev,
269 struct device_attribute *attr,
270 char *buf)
271 {
272 struct efx_mcdi_mon_attribute *mon_attr =
273 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
274 return sprintf(buf, "%s\n",
275 efx_mcdi_sensor_type[mon_attr->type].label);
276 }
277
278 static void
279 efx_mcdi_mon_add_attr(struct efx_nic *efx, const char *name,
280 ssize_t (*reader)(struct device *,
281 struct device_attribute *, char *),
282 unsigned int index, unsigned int type,
283 unsigned int limit_value)
284 {
285 struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
286 struct efx_mcdi_mon_attribute *attr = &hwmon->attrs[hwmon->n_attrs];
287
288 strlcpy(attr->name, name, sizeof(attr->name));
289 attr->index = index;
290 attr->type = type;
291 if (type < ARRAY_SIZE(efx_mcdi_sensor_type))
292 attr->hwmon_type = efx_mcdi_sensor_type[type].hwmon_type;
293 else
294 attr->hwmon_type = EFX_HWMON_UNKNOWN;
295 attr->limit_value = limit_value;
296 sysfs_attr_init(&attr->dev_attr.attr);
297 attr->dev_attr.attr.name = attr->name;
298 attr->dev_attr.attr.mode = 0444;
299 attr->dev_attr.show = reader;
300 hwmon->group.attrs[hwmon->n_attrs++] = &attr->dev_attr.attr;
301 }
302
303 int efx_mcdi_mon_probe(struct efx_nic *efx)
304 {
305 unsigned int n_temp = 0, n_cool = 0, n_in = 0, n_curr = 0, n_power = 0;
306 struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
307 MCDI_DECLARE_BUF(inbuf, MC_CMD_SENSOR_INFO_EXT_IN_LEN);
308 MCDI_DECLARE_BUF(outbuf, MC_CMD_SENSOR_INFO_OUT_LENMAX);
309 unsigned int n_pages, n_sensors, n_attrs, page;
310 size_t outlen;
311 char name[12];
312 u32 mask;
313 int rc, i, j, type;
314
315 /* Find out how many sensors are present */
316 n_sensors = 0;
317 page = 0;
318 do {
319 MCDI_SET_DWORD(inbuf, SENSOR_INFO_EXT_IN_PAGE, page);
320
321 rc = efx_mcdi_rpc(efx, MC_CMD_SENSOR_INFO, inbuf, sizeof(inbuf),
322 outbuf, sizeof(outbuf), &outlen);
323 if (rc)
324 return rc;
325 if (outlen < MC_CMD_SENSOR_INFO_OUT_LENMIN)
326 return -EIO;
327
328 mask = MCDI_DWORD(outbuf, SENSOR_INFO_OUT_MASK);
329 n_sensors += hweight32(mask & ~(1 << MC_CMD_SENSOR_PAGE0_NEXT));
330 ++page;
331 } while (mask & (1 << MC_CMD_SENSOR_PAGE0_NEXT));
332 n_pages = page;
333
334 /* Don't create a device if there are none */
335 if (n_sensors == 0)
336 return 0;
337
338 rc = efx_nic_alloc_buffer(
339 efx, &hwmon->dma_buf,
340 n_sensors * MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_LEN,
341 GFP_KERNEL);
342 if (rc)
343 return rc;
344
345 mutex_init(&hwmon->update_lock);
346 efx_mcdi_mon_update(efx);
347
348 /* Allocate space for the maximum possible number of
349 * attributes for this set of sensors:
350 * value, min, max, crit, alarm and label for each sensor.
351 */
352 n_attrs = 6 * n_sensors;
353 hwmon->attrs = kcalloc(n_attrs, sizeof(*hwmon->attrs), GFP_KERNEL);
354 if (!hwmon->attrs) {
355 rc = -ENOMEM;
356 goto fail;
357 }
358 hwmon->group.attrs = kcalloc(n_attrs + 1, sizeof(struct attribute *),
359 GFP_KERNEL);
360 if (!hwmon->group.attrs) {
361 rc = -ENOMEM;
362 goto fail;
363 }
364
365 for (i = 0, j = -1, type = -1; ; i++) {
366 enum efx_hwmon_type hwmon_type;
367 const char *hwmon_prefix;
368 unsigned hwmon_index;
369 u16 min1, max1, min2, max2;
370
371 /* Find next sensor type or exit if there is none */
372 do {
373 type++;
374
375 if ((type % 32) == 0) {
376 page = type / 32;
377 j = -1;
378 if (page == n_pages)
379 goto hwmon_register;
380
381 MCDI_SET_DWORD(inbuf, SENSOR_INFO_EXT_IN_PAGE,
382 page);
383 rc = efx_mcdi_rpc(efx, MC_CMD_SENSOR_INFO,
384 inbuf, sizeof(inbuf),
385 outbuf, sizeof(outbuf),
386 &outlen);
387 if (rc)
388 goto fail;
389 if (outlen < MC_CMD_SENSOR_INFO_OUT_LENMIN) {
390 rc = -EIO;
391 goto fail;
392 }
393
394 mask = (MCDI_DWORD(outbuf,
395 SENSOR_INFO_OUT_MASK) &
396 ~(1 << MC_CMD_SENSOR_PAGE0_NEXT));
397
398 /* Check again for short response */
399 if (outlen <
400 MC_CMD_SENSOR_INFO_OUT_LEN(hweight32(mask))) {
401 rc = -EIO;
402 goto fail;
403 }
404 }
405 } while (!(mask & (1 << type % 32)));
406 j++;
407
408 if (type < ARRAY_SIZE(efx_mcdi_sensor_type)) {
409 hwmon_type = efx_mcdi_sensor_type[type].hwmon_type;
410
411 /* Skip sensors specific to a different port */
412 if (hwmon_type != EFX_HWMON_UNKNOWN &&
413 efx_mcdi_sensor_type[type].port >= 0 &&
414 efx_mcdi_sensor_type[type].port !=
415 efx_port_num(efx))
416 continue;
417 } else {
418 hwmon_type = EFX_HWMON_UNKNOWN;
419 }
420
421 switch (hwmon_type) {
422 case EFX_HWMON_TEMP:
423 hwmon_prefix = "temp";
424 hwmon_index = ++n_temp; /* 1-based */
425 break;
426 case EFX_HWMON_COOL:
427 /* This is likely to be a heatsink, but there
428 * is no convention for representing cooling
429 * devices other than fans.
430 */
431 hwmon_prefix = "fan";
432 hwmon_index = ++n_cool; /* 1-based */
433 break;
434 default:
435 hwmon_prefix = "in";
436 hwmon_index = n_in++; /* 0-based */
437 break;
438 case EFX_HWMON_CURR:
439 hwmon_prefix = "curr";
440 hwmon_index = ++n_curr; /* 1-based */
441 break;
442 case EFX_HWMON_POWER:
443 hwmon_prefix = "power";
444 hwmon_index = ++n_power; /* 1-based */
445 break;
446 }
447
448 min1 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
449 SENSOR_INFO_ENTRY, j, MIN1);
450 max1 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
451 SENSOR_INFO_ENTRY, j, MAX1);
452 min2 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
453 SENSOR_INFO_ENTRY, j, MIN2);
454 max2 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
455 SENSOR_INFO_ENTRY, j, MAX2);
456
457 if (min1 != max1) {
458 snprintf(name, sizeof(name), "%s%u_input",
459 hwmon_prefix, hwmon_index);
460 efx_mcdi_mon_add_attr(
461 efx, name, efx_mcdi_mon_show_value, i, type, 0);
462
463 if (hwmon_type != EFX_HWMON_POWER) {
464 snprintf(name, sizeof(name), "%s%u_min",
465 hwmon_prefix, hwmon_index);
466 efx_mcdi_mon_add_attr(
467 efx, name, efx_mcdi_mon_show_limit,
468 i, type, min1);
469 }
470
471 snprintf(name, sizeof(name), "%s%u_max",
472 hwmon_prefix, hwmon_index);
473 efx_mcdi_mon_add_attr(
474 efx, name, efx_mcdi_mon_show_limit,
475 i, type, max1);
476
477 if (min2 != max2) {
478 /* Assume max2 is critical value.
479 * But we have no good way to expose min2.
480 */
481 snprintf(name, sizeof(name), "%s%u_crit",
482 hwmon_prefix, hwmon_index);
483 efx_mcdi_mon_add_attr(
484 efx, name, efx_mcdi_mon_show_limit,
485 i, type, max2);
486 }
487 }
488
489 snprintf(name, sizeof(name), "%s%u_alarm",
490 hwmon_prefix, hwmon_index);
491 efx_mcdi_mon_add_attr(
492 efx, name, efx_mcdi_mon_show_alarm, i, type, 0);
493
494 if (type < ARRAY_SIZE(efx_mcdi_sensor_type) &&
495 efx_mcdi_sensor_type[type].label) {
496 snprintf(name, sizeof(name), "%s%u_label",
497 hwmon_prefix, hwmon_index);
498 efx_mcdi_mon_add_attr(
499 efx, name, efx_mcdi_mon_show_label, i, type, 0);
500 }
501 }
502
503 hwmon_register:
504 hwmon->groups[0] = &hwmon->group;
505 hwmon->device = hwmon_device_register_with_groups(&efx->pci_dev->dev,
506 KBUILD_MODNAME, NULL,
507 hwmon->groups);
508 if (IS_ERR(hwmon->device)) {
509 rc = PTR_ERR(hwmon->device);
510 goto fail;
511 }
512
513 return 0;
514
515 fail:
516 efx_mcdi_mon_remove(efx);
517 return rc;
518 }
519
520 void efx_mcdi_mon_remove(struct efx_nic *efx)
521 {
522 struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
523
524 if (hwmon->device)
525 hwmon_device_unregister(hwmon->device);
526 kfree(hwmon->attrs);
527 kfree(hwmon->group.attrs);
528 efx_nic_free_buffer(efx, &hwmon->dma_buf);
529 }
530
531 #endif /* CONFIG_SFC_MCDI_MON */
Linux with added FPC-III support