ixgbe: add hwmon interface to export thermal data

Some of our adapters have thermal data available, this patch exports
this data via hwmon sysfs interface.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 271 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sysfs.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sysfs.c
new file mode 100644
index 000000000000..aa41fb705469
--- /dev/null
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sysfs.c
@@ -0,0 +1,271 @@
+/*******************************************************************************
+
+  Intel 10 Gigabit PCI Express Linux driver
+  Copyright(c) 1999 - 2012 Intel Corporation.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Contact Information:
+  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+#include "ixgbe.h"
+#include "ixgbe_common.h"
+#include "ixgbe_type.h"
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/sysfs.h>
+#include <linux/kobject.h>
+#include <linux/device.h>
+#include <linux/netdevice.h>
+#include <linux/hwmon.h>
+
+/*
+ * This file provides a sysfs interface to export information from the
+ * driver.  The information presented is READ-ONLY.
+ */
+#ifdef CONFIG_IXGBE_HWMON
+
+/* hwmon callback functions */
+static ssize_t ixgbe_hwmon_show_location(struct device *dev,
+                                         struct device_attribute *attr,
+                                         char *buf)
+{
+        struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
+                                                     dev_attr);
+        return sprintf(buf, "loc%u\n",
+                       ixgbe_attr->sensor->location);
+}
+
+static ssize_t ixgbe_hwmon_show_temp(struct device *dev,
+                                     struct device_attribute *attr,
+                                     char *buf)
+{
+        struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
+                                                     dev_attr);
+        unsigned int value;
+
+        /* reset the temp field */
+        ixgbe_attr->hw->mac.ops.get_thermal_sensor_data(ixgbe_attr->hw);
+
+        value = ixgbe_attr->sensor->temp;
+
+        /* display millidegree */
+        value *= 1000;
+
+        return sprintf(buf, "%u\n", value);
+}
+
+static ssize_t ixgbe_hwmon_show_cautionthresh(struct device *dev,
+                                     struct device_attribute *attr,
+                                     char *buf)
+{
+        struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
+                                                     dev_attr);
+        unsigned int value = ixgbe_attr->sensor->caution_thresh;
+
+        /* display millidegree */
+        value *= 1000;
+
+        return sprintf(buf, "%u\n", value);
+}
+
+static ssize_t ixgbe_hwmon_show_maxopthresh(struct device *dev,
+                                     struct device_attribute *attr,
+                                     char *buf)
+{
+        struct hwmon_attr *ixgbe_attr = container_of(attr, struct hwmon_attr,
+                                                     dev_attr);
+        unsigned int value = ixgbe_attr->sensor->max_op_thresh;
+
+        /* display millidegree */
+        value *= 1000;
+
+        return sprintf(buf, "%u\n", value);
+}
+
+/*
+ * ixgbe_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
+ * @ adapter: pointer to the adapter structure
+ * @ offset: offset in the eeprom sensor data table
+ * @ type: type of sensor data to display
+ *
+ * For each file we want in hwmon's sysfs interface we need a device_attribute
+ * This is included in our hwmon_attr struct that contains the references to
+ * the data structures we need to get the data to display.
+ */
+static int ixgbe_add_hwmon_attr(struct ixgbe_adapter *adapter,
+                                unsigned int offset, int type) {
+        int rc;
+        unsigned int n_attr;
+        struct hwmon_attr *ixgbe_attr;
+
+        n_attr = adapter->ixgbe_hwmon_buff.n_hwmon;
+        ixgbe_attr = &adapter->ixgbe_hwmon_buff.hwmon_list[n_attr];
+
+        switch (type) {
+        case IXGBE_HWMON_TYPE_LOC:
+                ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_location;
+                snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
+                         "temp%u_label", offset);
+                break;
+        case IXGBE_HWMON_TYPE_TEMP:
+                ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_temp;
+                snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
+                         "temp%u_input", offset);
+                break;
+        case IXGBE_HWMON_TYPE_CAUTION:
+                ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_cautionthresh;
+                snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
+                         "temp%u_max", offset);
+                break;
+        case IXGBE_HWMON_TYPE_MAX:
+                ixgbe_attr->dev_attr.show = ixgbe_hwmon_show_maxopthresh;
+                snprintf(ixgbe_attr->name, sizeof(ixgbe_attr->name),
+                         "temp%u_crit", offset);
+                break;
+        default:
+                rc = -EPERM;
+                return rc;
+        }
+
+        /* These always the same regardless of type */
+        ixgbe_attr->sensor =
+                &adapter->hw.mac.thermal_sensor_data.sensor[offset];
+        ixgbe_attr->hw = &adapter->hw;
+        ixgbe_attr->dev_attr.store = NULL;
+        ixgbe_attr->dev_attr.attr.mode = S_IRUGO;
+        ixgbe_attr->dev_attr.attr.name = ixgbe_attr->name;
+
+        rc = device_create_file(&adapter->pdev->dev,
+                                &ixgbe_attr->dev_attr);
+
+        if (rc == 0)
+                ++adapter->ixgbe_hwmon_buff.n_hwmon;
+
+        return rc;
+}
+#endif /* CONFIG_IXGBE_HWMON */
+
+static void ixgbe_sysfs_del_adapter(struct ixgbe_adapter *adapter)
+{
+#ifdef CONFIG_IXGBE_HWMON
+        int i;
+#endif /* CONFIG_IXGBE_HWMON */
+
+        if (adapter == NULL)
+                return;
+#ifdef CONFIG_IXGBE_HWMON
+
+        for (i = 0; i < adapter->ixgbe_hwmon_buff.n_hwmon; i++) {
+                device_remove_file(&adapter->pdev->dev,
+                           &adapter->ixgbe_hwmon_buff.hwmon_list[i].dev_attr);
+        }
+
+        kfree(adapter->ixgbe_hwmon_buff.hwmon_list);
+
+        if (adapter->ixgbe_hwmon_buff.device)
+                hwmon_device_unregister(adapter->ixgbe_hwmon_buff.device);
+#endif /* CONFIG_IXGBE_HWMON */
+
+        if (adapter->info_kobj != NULL)
+                kobject_put(adapter->info_kobj);
+}
+
+/* called from ixgbe_main.c */
+void ixgbe_sysfs_exit(struct ixgbe_adapter *adapter)
+{
+        ixgbe_sysfs_del_adapter(adapter);
+}
+
+/* called from ixgbe_main.c */
+int ixgbe_sysfs_init(struct ixgbe_adapter *adapter)
+{
+#ifdef CONFIG_IXGBE_HWMON
+        struct hwmon_buff *ixgbe_hwmon = &adapter->ixgbe_hwmon_buff;
+        unsigned int i;
+        int n_attrs;
+#endif /* CONFIG_IXGBE_HWMON */
+        struct net_device *netdev = adapter->netdev;
+        int rc = 0;
+
+        /* create info kobj and attribute listings in kobj */
+        adapter->info_kobj = kobject_create_and_add("info", &netdev->dev.kobj);
+        if (adapter->info_kobj == NULL) {
+                rc = -ENOMEM;
+                goto err;
+        }
+
+#ifdef CONFIG_IXGBE_HWMON
+        /* If this method isn't defined we don't support thermals */
+        if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL) {
+                rc = -EPERM;
+                goto err;
+        }
+
+        /* Don't create thermal hwmon interface if no sensors present */
+        rc = adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw);
+        if (rc)
+                goto err;
+
+        /*
+         * Allocation space for max attributs
+         * max num sensors * values (loc, temp, max, caution)
+         */
+        n_attrs = IXGBE_MAX_SENSORS * 4;
+        ixgbe_hwmon->hwmon_list = kcalloc(n_attrs, sizeof(struct hwmon_attr),
+                                          GFP_KERNEL);
+        if (!ixgbe_hwmon->hwmon_list) {
+                rc = -ENOMEM;
+                goto err;
+        }
+
+        ixgbe_hwmon->device = hwmon_device_register(&adapter->pdev->dev);
+        if (IS_ERR(ixgbe_hwmon->device)) {
+                rc = PTR_ERR(ixgbe_hwmon->device);
+                goto err;
+        }
+
+        for (i = 0; i < IXGBE_MAX_SENSORS; i++) {
+                /*
+                 * Only create hwmon sysfs entries for sensors that have
+                 * meaningful data for.
+                 */
+                if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
+                        continue;
+
+                /* Bail if any hwmon attr struct fails to initialize */
+                rc = ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_CAUTION);
+                rc |= ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_LOC);
+                rc |= ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_TEMP);
+                rc |= ixgbe_add_hwmon_attr(adapter, i, IXGBE_HWMON_TYPE_MAX);
+                if (rc)
+                        goto err;
+        }
+#endif /* CONFIG_IXGBE_HWMON */
+
+        goto exit;
+
+err:
+        ixgbe_sysfs_del_adapter(adapter);
+exit:
+        return rc;
+}
+