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ixgbe_sysfs.c
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1 /*******************************************************************************
2 
3  Intel 10 Gigabit PCI Express Linux driver
4  Copyright(c) 1999 - 2012 Intel Corporation.
5 
6  This program is free software; you can redistribute it and/or modify it
7  under the terms and conditions of the GNU General Public License,
8  version 2, as published by the Free Software Foundation.
9 
10  This program is distributed in the hope it will be useful, but WITHOUT
11  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13  more details.
14 
15  You should have received a copy of the GNU General Public License along with
16  this program; if not, write to the Free Software Foundation, Inc.,
17  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 
19  The full GNU General Public License is included in this distribution in
20  the file called "COPYING".
21 
22  Contact Information:
23  e1000-devel Mailing List <[email protected]>
24  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 
26 *******************************************************************************/
27 
28 #include "ixgbe.h"
29 #include "ixgbe_common.h"
30 #include "ixgbe_type.h"
31 
32 #include <linux/module.h>
33 #include <linux/types.h>
34 #include <linux/sysfs.h>
35 #include <linux/kobject.h>
36 #include <linux/device.h>
37 #include <linux/netdevice.h>
38 #include <linux/hwmon.h>
39 
40 /* hwmon callback functions */
41 static ssize_t ixgbe_hwmon_show_location(struct device *dev,
42  struct device_attribute *attr,
43  char *buf)
44 {
45  struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
46  dev_attr);
47  return sprintf(buf, "loc%u\n",
48  ixgbe_attr->sensor->location);
49 }
50 
51 static ssize_t ixgbe_hwmon_show_temp(struct device *dev,
52  struct device_attribute *attr,
53  char *buf)
54 {
55  struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
56  dev_attr);
57  unsigned int value;
58 
59  /* reset the temp field */
60  ixgbe_attr->hw->mac.ops.get_thermal_sensor_data(ixgbe_attr->hw);
61 
62  value = ixgbe_attr->sensor->temp;
63 
64  /* display millidegree */
65  value *= 1000;
66 
67  return sprintf(buf, "%u\n", value);
68 }
69 
70 static ssize_t ixgbe_hwmon_show_cautionthresh(struct device *dev,
71  struct device_attribute *attr,
72  char *buf)
73 {
74  struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
75  dev_attr);
76  unsigned int value = ixgbe_attr->sensor->caution_thresh;
77 
78  /* display millidegree */
79  value *= 1000;
80 
81  return sprintf(buf, "%u\n", value);
82 }
83 
84 static ssize_t ixgbe_hwmon_show_maxopthresh(struct device *dev,
85  struct device_attribute *attr,
86  char *buf)
87 {
88  struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
89  dev_attr);
90  unsigned int value = ixgbe_attr->sensor->max_op_thresh;
91 
92  /* display millidegree */
93  value *= 1000;
94 
95  return sprintf(buf, "%u\n", value);
96 }
97 
108 static int ixgbe_add_hwmon_attr(struct ixgbe_adapter *adapter,
109  unsigned int offset, int type) {
110  int rc;
111  unsigned int n_attr;
112  struct hwmon_attr *ixgbe_attr;
113 
114  n_attr = adapter->ixgbe_hwmon_buff.n_hwmon;
115  ixgbe_attr = &adapter->ixgbe_hwmon_buff.hwmon_list[n_attr];
116 
117  switch (type) {
118  case IXGBE_HWMON_TYPE_LOC:
119  ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_location;
120  snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
121  "temp%u_label", offset);
122  break;
123  case IXGBE_HWMON_TYPE_TEMP:
124  ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_temp;
125  snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
126  "temp%u_input", offset);
127  break;
128  case IXGBE_HWMON_TYPE_CAUTION:
129  ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_cautionthresh;
130  snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
131  "temp%u_max", offset);
132  break;
133  case IXGBE_HWMON_TYPE_MAX:
134  ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_maxopthresh;
135  snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
136  "temp%u_crit", offset);
137  break;
138  default:
139  rc = -EPERM;
140  return rc;
141  }
142 
143  /* These always the same regardless of type */
144  ixgbe_attr->sensor =
145  &adapter->hw.mac.thermal_sensor_data.sensor[offset];
146  ixgbe_attr->hw = &adapter->hw;
147  ixgbe_attr->dev_attr.store = NULL;
148  ixgbe_attr->dev_attr.attr.mode = S_IRUGO;
149  ixgbe_attr->dev_attr.attr.name = ixgbe_attr->name;
150 
151  rc = device_create_file(&adapter->pdev->dev,
152  &ixgbe_attr->dev_attr);
153 
154  if (rc == 0)
155  ++adapter->ixgbe_hwmon_buff.n_hwmon;
156 
157  return rc;
158 }
159 
160 static void ixgbe_sysfs_del_adapter(struct ixgbe_adapter *adapter)
161 {
162  int i;
163 
164  if (adapter == NULL)
165  return;
166 
167  for (i = 0; i < adapter->ixgbe_hwmon_buff.n_hwmon; i++) {
168  device_remove_file(&adapter->pdev->dev,
169  &adapter->ixgbe_hwmon_buff.hwmon_list[i].dev_attr);
170  }
171 
172  kfree(adapter->ixgbe_hwmon_buff.hwmon_list);
173 
174  if (adapter->ixgbe_hwmon_buff.device)
175  hwmon_device_unregister(adapter->ixgbe_hwmon_buff.device);
176 }
177 
178 /* called from ixgbe_main.c */
179 void ixgbe_sysfs_exit(struct ixgbe_adapter *adapter)
180 {
181  ixgbe_sysfs_del_adapter(adapter);
182 }
183 
184 /* called from ixgbe_main.c */
185 int ixgbe_sysfs_init(struct ixgbe_adapter *adapter)
186 {
187  struct hwmon_buff *ixgbe_hwmon = &adapter->ixgbe_hwmon_buff;
188  unsigned int i;
189  int n_attrs;
190  int rc = 0;
191 
192  /* If this method isn't defined we don't support thermals */
193  if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL) {
194  goto exit;
195  }
196 
197  /* Don't create thermal hwmon interface if no sensors present */
198  if (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw))
199  goto exit;
200 
201  /*
202  * Allocation space for max attributs
203  * max num sensors * values (loc, temp, max, caution)
204  */
205  n_attrs = IXGBE_MAX_SENSORS * 4;
206  ixgbe_hwmon->hwmon_list = kcalloc(n_attrs, sizeof(struct hwmon_attr),
207  GFP_KERNEL);
208  if (!ixgbe_hwmon->hwmon_list) {
209  rc = -ENOMEM;
210  goto err;
211  }
212 
213  ixgbe_hwmon->device = hwmon_device_register(&adapter->pdev->dev);
214  if (IS_ERR(ixgbe_hwmon->device)) {
215  rc = PTR_ERR(ixgbe_hwmon->device);
216  goto err;
217  }
218 
219  for (i = 0; i < IXGBE_MAX_SENSORS; i++) {
220  /*
221  * Only create hwmon sysfs entries for sensors that have
222  * meaningful data for.
223  */
224  if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
225  continue;
226 
227  /* Bail if any hwmon attr struct fails to initialize */
228  rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_CAUTION);
229  rc |= ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_LOC);
230  rc |= ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_TEMP);
231  rc |= ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_MAX);
232  if (rc)
233  goto err;
234  }
235 
236  goto exit;
237 
238 err:
239  ixgbe_sysfs_del_adapter(adapter);
240 exit:
241  return rc;
242 }
243