Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / net / ethernet / sfc / mcdi_mon.c
1 /****************************************************************************
2  * Driver for Solarflare network controllers and boards
3  * Copyright 2011-2013 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,           /* voltage */
25         EFX_HWMON_CURR,         /* current */
26         EFX_HWMON_POWER,        /* power */
27         EFX_HWMON_TYPES_COUNT
28 };
29
30 static const char *const efx_hwmon_unit[EFX_HWMON_TYPES_COUNT] = {
31         [EFX_HWMON_TEMP]  = " degC",
32         [EFX_HWMON_COOL]  = " rpm", /* though nonsense for a heatsink */
33         [EFX_HWMON_IN]    = " mV",
34         [EFX_HWMON_CURR]  = " mA",
35         [EFX_HWMON_POWER] = " W",
36 };
37
38 static const struct {
39         const char *label;
40         enum efx_hwmon_type hwmon_type;
41         int port;
42 } efx_mcdi_sensor_type[] = {
43 #define SENSOR(name, label, hwmon_type, port)                           \
44         [MC_CMD_SENSOR_##name] = { label, EFX_HWMON_ ## hwmon_type, port }
45         SENSOR(CONTROLLER_TEMP,         "Controller board temp.",   TEMP,  -1),
46         SENSOR(PHY_COMMON_TEMP,         "PHY temp.",                TEMP,  -1),
47         SENSOR(CONTROLLER_COOLING,      "Controller heat sink",     COOL,  -1),
48         SENSOR(PHY0_TEMP,               "PHY temp.",                TEMP,  0),
49         SENSOR(PHY0_COOLING,            "PHY heat sink",            COOL,  0),
50         SENSOR(PHY1_TEMP,               "PHY temp.",                TEMP,  1),
51         SENSOR(PHY1_COOLING,            "PHY heat sink",            COOL,  1),
52         SENSOR(IN_1V0,                  "1.0V supply",              IN,    -1),
53         SENSOR(IN_1V2,                  "1.2V supply",              IN,    -1),
54         SENSOR(IN_1V8,                  "1.8V supply",              IN,    -1),
55         SENSOR(IN_2V5,                  "2.5V supply",              IN,    -1),
56         SENSOR(IN_3V3,                  "3.3V supply",              IN,    -1),
57         SENSOR(IN_12V0,                 "12.0V supply",             IN,    -1),
58         SENSOR(IN_1V2A,                 "1.2V analogue supply",     IN,    -1),
59         SENSOR(IN_VREF,                 "Ref. voltage",             IN,    -1),
60         SENSOR(OUT_VAOE,                "AOE FPGA supply",          IN,    -1),
61         SENSOR(AOE_TEMP,                "AOE FPGA temp.",           TEMP,  -1),
62         SENSOR(PSU_AOE_TEMP,            "AOE regulator temp.",      TEMP,  -1),
63         SENSOR(PSU_TEMP,                "Controller regulator temp.",
64                                                                     TEMP,  -1),
65         SENSOR(FAN_0,                   "Fan 0",                    COOL,  -1),
66         SENSOR(FAN_1,                   "Fan 1",                    COOL,  -1),
67         SENSOR(FAN_2,                   "Fan 2",                    COOL,  -1),
68         SENSOR(FAN_3,                   "Fan 3",                    COOL,  -1),
69         SENSOR(FAN_4,                   "Fan 4",                    COOL,  -1),
70         SENSOR(IN_VAOE,                 "AOE input supply",         IN,    -1),
71         SENSOR(OUT_IAOE,                "AOE output current",       CURR,  -1),
72         SENSOR(IN_IAOE,                 "AOE input current",        CURR,  -1),
73         SENSOR(NIC_POWER,               "Board power use",          POWER, -1),
74         SENSOR(IN_0V9,                  "0.9V supply",              IN,    -1),
75         SENSOR(IN_I0V9,                 "0.9V supply current",      CURR,  -1),
76         SENSOR(IN_I1V2,                 "1.2V supply current",      CURR,  -1),
77         SENSOR(IN_0V9_ADC,              "0.9V supply (ext. ADC)",   IN,    -1),
78         SENSOR(CONTROLLER_2_TEMP,       "Controller board temp. 2", TEMP,  -1),
79         SENSOR(VREG_INTERNAL_TEMP,      "Regulator die temp.",      TEMP,  -1),
80         SENSOR(VREG_0V9_TEMP,           "0.9V regulator temp.",     TEMP,  -1),
81         SENSOR(VREG_1V2_TEMP,           "1.2V regulator temp.",     TEMP,  -1),
82         SENSOR(CONTROLLER_VPTAT,
83                               "Controller PTAT voltage (int. ADC)", IN,    -1),
84         SENSOR(CONTROLLER_INTERNAL_TEMP,
85                                  "Controller die temp. (int. ADC)", TEMP,  -1),
86         SENSOR(CONTROLLER_VPTAT_EXTADC,
87                               "Controller PTAT voltage (ext. ADC)", IN,    -1),
88         SENSOR(CONTROLLER_INTERNAL_TEMP_EXTADC,
89                                  "Controller die temp. (ext. ADC)", TEMP,  -1),
90         SENSOR(AMBIENT_TEMP,            "Ambient temp.",            TEMP,  -1),
91         SENSOR(AIRFLOW,                 "Air flow raw",             IN,    -1),
92         SENSOR(VDD08D_VSS08D_CSR,       "0.9V die (int. ADC)",      IN,    -1),
93         SENSOR(VDD08D_VSS08D_CSR_EXTADC, "0.9V die (ext. ADC)",     IN,    -1),
94         SENSOR(HOTPOINT_TEMP,  "Controller board temp. (hotpoint)", TEMP,  -1),
95 #undef SENSOR
96 };
97
98 static const char *const sensor_status_names[] = {
99         [MC_CMD_SENSOR_STATE_OK] = "OK",
100         [MC_CMD_SENSOR_STATE_WARNING] = "Warning",
101         [MC_CMD_SENSOR_STATE_FATAL] = "Fatal",
102         [MC_CMD_SENSOR_STATE_BROKEN] = "Device failure",
103         [MC_CMD_SENSOR_STATE_NO_READING] = "No reading",
104 };
105
106 void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev)
107 {
108         unsigned int type, state, value;
109         enum efx_hwmon_type hwmon_type = EFX_HWMON_UNKNOWN;
110         const char *name = NULL, *state_txt, *unit;
111
112         type = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_MONITOR);
113         state = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_STATE);
114         value = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_VALUE);
115
116         /* Deal gracefully with the board having more drivers than we
117          * know about, but do not expect new sensor states. */
118         if (type < ARRAY_SIZE(efx_mcdi_sensor_type)) {
119                 name = efx_mcdi_sensor_type[type].label;
120                 hwmon_type = efx_mcdi_sensor_type[type].hwmon_type;
121         }
122         if (!name)
123                 name = "No sensor name available";
124         EFX_BUG_ON_PARANOID(state >= ARRAY_SIZE(sensor_status_names));
125         state_txt = sensor_status_names[state];
126         EFX_BUG_ON_PARANOID(hwmon_type >= EFX_HWMON_TYPES_COUNT);
127         unit = efx_hwmon_unit[hwmon_type];
128         if (!unit)
129                 unit = "";
130
131         netif_err(efx, hw, efx->net_dev,
132                   "Sensor %d (%s) reports condition '%s' for value %d%s\n",
133                   type, name, state_txt, value, unit);
134 }
135
136 #ifdef CONFIG_SFC_MCDI_MON
137
138 struct efx_mcdi_mon_attribute {
139         struct device_attribute dev_attr;
140         unsigned int index;
141         unsigned int type;
142         enum efx_hwmon_type hwmon_type;
143         unsigned int limit_value;
144         char name[12];
145 };
146
147 static int efx_mcdi_mon_update(struct efx_nic *efx)
148 {
149         struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
150         MCDI_DECLARE_BUF(inbuf, MC_CMD_READ_SENSORS_EXT_IN_LEN);
151         int rc;
152
153         MCDI_SET_QWORD(inbuf, READ_SENSORS_EXT_IN_DMA_ADDR,
154                        hwmon->dma_buf.dma_addr);
155         MCDI_SET_DWORD(inbuf, READ_SENSORS_EXT_IN_LENGTH, hwmon->dma_buf.len);
156
157         rc = efx_mcdi_rpc(efx, MC_CMD_READ_SENSORS,
158                           inbuf, sizeof(inbuf), NULL, 0, NULL);
159         if (rc == 0)
160                 hwmon->last_update = jiffies;
161         return rc;
162 }
163
164 static int efx_mcdi_mon_get_entry(struct device *dev, unsigned int index,
165                                   efx_dword_t *entry)
166 {
167         struct efx_nic *efx = dev_get_drvdata(dev->parent);
168         struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
169         int rc;
170
171         BUILD_BUG_ON(MC_CMD_READ_SENSORS_OUT_LEN != 0);
172
173         mutex_lock(&hwmon->update_lock);
174
175         /* Use cached value if last update was < 1 s ago */
176         if (time_before(jiffies, hwmon->last_update + HZ))
177                 rc = 0;
178         else
179                 rc = efx_mcdi_mon_update(efx);
180
181         /* Copy out the requested entry */
182         *entry = ((efx_dword_t *)hwmon->dma_buf.addr)[index];
183
184         mutex_unlock(&hwmon->update_lock);
185
186         return rc;
187 }
188
189 static ssize_t efx_mcdi_mon_show_value(struct device *dev,
190                                        struct device_attribute *attr,
191                                        char *buf)
192 {
193         struct efx_mcdi_mon_attribute *mon_attr =
194                 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
195         efx_dword_t entry;
196         unsigned int value, state;
197         int rc;
198
199         rc = efx_mcdi_mon_get_entry(dev, mon_attr->index, &entry);
200         if (rc)
201                 return rc;
202
203         state = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_STATE);
204         if (state == MC_CMD_SENSOR_STATE_NO_READING)
205                 return -EBUSY;
206
207         value = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_VALUE);
208
209         switch (mon_attr->hwmon_type) {
210         case EFX_HWMON_TEMP:
211                 /* Convert temperature from degrees to milli-degrees Celsius */
212                 value *= 1000;
213                 break;
214         case EFX_HWMON_POWER:
215                 /* Convert power from watts to microwatts */
216                 value *= 1000000;
217                 break;
218         default:
219                 /* No conversion needed */
220                 break;
221         }
222
223         return sprintf(buf, "%u\n", value);
224 }
225
226 static ssize_t efx_mcdi_mon_show_limit(struct device *dev,
227                                        struct device_attribute *attr,
228                                        char *buf)
229 {
230         struct efx_mcdi_mon_attribute *mon_attr =
231                 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
232         unsigned int value;
233
234         value = mon_attr->limit_value;
235
236         switch (mon_attr->hwmon_type) {
237         case EFX_HWMON_TEMP:
238                 /* Convert temperature from degrees to milli-degrees Celsius */
239                 value *= 1000;
240                 break;
241         case EFX_HWMON_POWER:
242                 /* Convert power from watts to microwatts */
243                 value *= 1000000;
244                 break;
245         default:
246                 /* No conversion needed */
247                 break;
248         }
249
250         return sprintf(buf, "%u\n", value);
251 }
252
253 static ssize_t efx_mcdi_mon_show_alarm(struct device *dev,
254                                        struct device_attribute *attr,
255                                        char *buf)
256 {
257         struct efx_mcdi_mon_attribute *mon_attr =
258                 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
259         efx_dword_t entry;
260         int state;
261         int rc;
262
263         rc = efx_mcdi_mon_get_entry(dev, mon_attr->index, &entry);
264         if (rc)
265                 return rc;
266
267         state = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_STATE);
268         return sprintf(buf, "%d\n", state != MC_CMD_SENSOR_STATE_OK);
269 }
270
271 static ssize_t efx_mcdi_mon_show_label(struct device *dev,
272                                        struct device_attribute *attr,
273                                        char *buf)
274 {
275         struct efx_mcdi_mon_attribute *mon_attr =
276                 container_of(attr, struct efx_mcdi_mon_attribute, dev_attr);
277         return sprintf(buf, "%s\n",
278                        efx_mcdi_sensor_type[mon_attr->type].label);
279 }
280
281 static void
282 efx_mcdi_mon_add_attr(struct efx_nic *efx, const char *name,
283                       ssize_t (*reader)(struct device *,
284                                         struct device_attribute *, char *),
285                       unsigned int index, unsigned int type,
286                       unsigned int limit_value)
287 {
288         struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
289         struct efx_mcdi_mon_attribute *attr = &hwmon->attrs[hwmon->n_attrs];
290
291         strlcpy(attr->name, name, sizeof(attr->name));
292         attr->index = index;
293         attr->type = type;
294         if (type < ARRAY_SIZE(efx_mcdi_sensor_type))
295                 attr->hwmon_type = efx_mcdi_sensor_type[type].hwmon_type;
296         else
297                 attr->hwmon_type = EFX_HWMON_UNKNOWN;
298         attr->limit_value = limit_value;
299         sysfs_attr_init(&attr->dev_attr.attr);
300         attr->dev_attr.attr.name = attr->name;
301         attr->dev_attr.attr.mode = S_IRUGO;
302         attr->dev_attr.show = reader;
303         hwmon->group.attrs[hwmon->n_attrs++] = &attr->dev_attr.attr;
304 }
305
306 int efx_mcdi_mon_probe(struct efx_nic *efx)
307 {
308         unsigned int n_temp = 0, n_cool = 0, n_in = 0, n_curr = 0, n_power = 0;
309         struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
310         MCDI_DECLARE_BUF(inbuf, MC_CMD_SENSOR_INFO_EXT_IN_LEN);
311         MCDI_DECLARE_BUF(outbuf, MC_CMD_SENSOR_INFO_OUT_LENMAX);
312         unsigned int n_pages, n_sensors, n_attrs, page;
313         size_t outlen;
314         char name[12];
315         u32 mask;
316         int rc, i, j, type;
317
318         /* Find out how many sensors are present */
319         n_sensors = 0;
320         page = 0;
321         do {
322                 MCDI_SET_DWORD(inbuf, SENSOR_INFO_EXT_IN_PAGE, page);
323
324                 rc = efx_mcdi_rpc(efx, MC_CMD_SENSOR_INFO, inbuf, sizeof(inbuf),
325                                   outbuf, sizeof(outbuf), &outlen);
326                 if (rc)
327                         return rc;
328                 if (outlen < MC_CMD_SENSOR_INFO_OUT_LENMIN)
329                         return -EIO;
330
331                 mask = MCDI_DWORD(outbuf, SENSOR_INFO_OUT_MASK);
332                 n_sensors += hweight32(mask & ~(1 << MC_CMD_SENSOR_PAGE0_NEXT));
333                 ++page;
334         } while (mask & (1 << MC_CMD_SENSOR_PAGE0_NEXT));
335         n_pages = page;
336
337         /* Don't create a device if there are none */
338         if (n_sensors == 0)
339                 return 0;
340
341         rc = efx_nic_alloc_buffer(
342                 efx, &hwmon->dma_buf,
343                 n_sensors * MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_LEN,
344                 GFP_KERNEL);
345         if (rc)
346                 return rc;
347
348         mutex_init(&hwmon->update_lock);
349         efx_mcdi_mon_update(efx);
350
351         /* Allocate space for the maximum possible number of
352          * attributes for this set of sensors:
353          * value, min, max, crit, alarm and label for each sensor.
354          */
355         n_attrs = 6 * n_sensors;
356         hwmon->attrs = kcalloc(n_attrs, sizeof(*hwmon->attrs), GFP_KERNEL);
357         if (!hwmon->attrs) {
358                 rc = -ENOMEM;
359                 goto fail;
360         }
361         hwmon->group.attrs = kcalloc(n_attrs + 1, sizeof(struct attribute *),
362                                      GFP_KERNEL);
363         if (!hwmon->group.attrs) {
364                 rc = -ENOMEM;
365                 goto fail;
366         }
367
368         for (i = 0, j = -1, type = -1; ; i++) {
369                 enum efx_hwmon_type hwmon_type;
370                 const char *hwmon_prefix;
371                 unsigned hwmon_index;
372                 u16 min1, max1, min2, max2;
373
374                 /* Find next sensor type or exit if there is none */
375                 do {
376                         type++;
377
378                         if ((type % 32) == 0) {
379                                 page = type / 32;
380                                 j = -1;
381                                 if (page == n_pages)
382                                         goto hwmon_register;
383
384                                 MCDI_SET_DWORD(inbuf, SENSOR_INFO_EXT_IN_PAGE,
385                                                page);
386                                 rc = efx_mcdi_rpc(efx, MC_CMD_SENSOR_INFO,
387                                                   inbuf, sizeof(inbuf),
388                                                   outbuf, sizeof(outbuf),
389                                                   &outlen);
390                                 if (rc)
391                                         goto fail;
392                                 if (outlen < MC_CMD_SENSOR_INFO_OUT_LENMIN) {
393                                         rc = -EIO;
394                                         goto fail;
395                                 }
396
397                                 mask = (MCDI_DWORD(outbuf,
398                                                    SENSOR_INFO_OUT_MASK) &
399                                         ~(1 << MC_CMD_SENSOR_PAGE0_NEXT));
400
401                                 /* Check again for short response */
402                                 if (outlen <
403                                     MC_CMD_SENSOR_INFO_OUT_LEN(hweight32(mask))) {
404                                         rc = -EIO;
405                                         goto fail;
406                                 }
407                         }
408                 } while (!(mask & (1 << type % 32)));
409                 j++;
410
411                 if (type < ARRAY_SIZE(efx_mcdi_sensor_type)) {
412                         hwmon_type = efx_mcdi_sensor_type[type].hwmon_type;
413
414                         /* Skip sensors specific to a different port */
415                         if (hwmon_type != EFX_HWMON_UNKNOWN &&
416                             efx_mcdi_sensor_type[type].port >= 0 &&
417                             efx_mcdi_sensor_type[type].port !=
418                             efx_port_num(efx))
419                                 continue;
420                 } else {
421                         hwmon_type = EFX_HWMON_UNKNOWN;
422                 }
423
424                 switch (hwmon_type) {
425                 case EFX_HWMON_TEMP:
426                         hwmon_prefix = "temp";
427                         hwmon_index = ++n_temp; /* 1-based */
428                         break;
429                 case EFX_HWMON_COOL:
430                         /* This is likely to be a heatsink, but there
431                          * is no convention for representing cooling
432                          * devices other than fans.
433                          */
434                         hwmon_prefix = "fan";
435                         hwmon_index = ++n_cool; /* 1-based */
436                         break;
437                 default:
438                         hwmon_prefix = "in";
439                         hwmon_index = n_in++; /* 0-based */
440                         break;
441                 case EFX_HWMON_CURR:
442                         hwmon_prefix = "curr";
443                         hwmon_index = ++n_curr; /* 1-based */
444                         break;
445                 case EFX_HWMON_POWER:
446                         hwmon_prefix = "power";
447                         hwmon_index = ++n_power; /* 1-based */
448                         break;
449                 }
450
451                 min1 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
452                                         SENSOR_INFO_ENTRY, j, MIN1);
453                 max1 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
454                                         SENSOR_INFO_ENTRY, j, MAX1);
455                 min2 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
456                                         SENSOR_INFO_ENTRY, j, MIN2);
457                 max2 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY,
458                                         SENSOR_INFO_ENTRY, j, MAX2);
459
460                 if (min1 != max1) {
461                         snprintf(name, sizeof(name), "%s%u_input",
462                                  hwmon_prefix, hwmon_index);
463                         efx_mcdi_mon_add_attr(
464                                 efx, name, efx_mcdi_mon_show_value, i, type, 0);
465
466                         if (hwmon_type != EFX_HWMON_POWER) {
467                                 snprintf(name, sizeof(name), "%s%u_min",
468                                          hwmon_prefix, hwmon_index);
469                                 efx_mcdi_mon_add_attr(
470                                         efx, name, efx_mcdi_mon_show_limit,
471                                         i, type, min1);
472                         }
473
474                         snprintf(name, sizeof(name), "%s%u_max",
475                                  hwmon_prefix, hwmon_index);
476                         efx_mcdi_mon_add_attr(
477                                 efx, name, efx_mcdi_mon_show_limit,
478                                 i, type, max1);
479
480                         if (min2 != max2) {
481                                 /* Assume max2 is critical value.
482                                  * But we have no good way to expose min2.
483                                  */
484                                 snprintf(name, sizeof(name), "%s%u_crit",
485                                          hwmon_prefix, hwmon_index);
486                                 efx_mcdi_mon_add_attr(
487                                         efx, name, efx_mcdi_mon_show_limit,
488                                         i, type, max2);
489                         }
490                 }
491
492                 snprintf(name, sizeof(name), "%s%u_alarm",
493                          hwmon_prefix, hwmon_index);
494                 efx_mcdi_mon_add_attr(
495                         efx, name, efx_mcdi_mon_show_alarm, i, type, 0);
496
497                 if (type < ARRAY_SIZE(efx_mcdi_sensor_type) &&
498                     efx_mcdi_sensor_type[type].label) {
499                         snprintf(name, sizeof(name), "%s%u_label",
500                                  hwmon_prefix, hwmon_index);
501                         efx_mcdi_mon_add_attr(
502                                 efx, name, efx_mcdi_mon_show_label, i, type, 0);
503                 }
504         }
505
506 hwmon_register:
507         hwmon->groups[0] = &hwmon->group;
508         hwmon->device = hwmon_device_register_with_groups(&efx->pci_dev->dev,
509                                                           KBUILD_MODNAME, NULL,
510                                                           hwmon->groups);
511         if (IS_ERR(hwmon->device)) {
512                 rc = PTR_ERR(hwmon->device);
513                 goto fail;
514         }
515
516         return 0;
517
518 fail:
519         efx_mcdi_mon_remove(efx);
520         return rc;
521 }
522
523 void efx_mcdi_mon_remove(struct efx_nic *efx)
524 {
525         struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx);
526
527         if (hwmon->device)
528                 hwmon_device_unregister(hwmon->device);
529         kfree(hwmon->attrs);
530         kfree(hwmon->group.attrs);
531         efx_nic_free_buffer(efx, &hwmon->dma_buf);
532 }
533
534 #endif /* CONFIG_SFC_MCDI_MON */