diff options
Diffstat (limited to 'drivers/net/ethernet/sfc/mcdi_mon.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/mcdi_mon.c | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/mcdi_mon.c b/drivers/net/ethernet/sfc/mcdi_mon.c new file mode 100644 index 00000000000..fb7f65b59eb --- /dev/null +++ b/drivers/net/ethernet/sfc/mcdi_mon.c @@ -0,0 +1,415 @@ +/**************************************************************************** + * Driver for Solarflare Solarstorm network controllers and boards + * Copyright 2011 Solarflare Communications Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation, incorporated herein by reference. + */ + +#include <linux/bitops.h> +#include <linux/slab.h> +#include <linux/hwmon.h> +#include <linux/stat.h> + +#include "net_driver.h" +#include "mcdi.h" +#include "mcdi_pcol.h" +#include "nic.h" + +enum efx_hwmon_type { + EFX_HWMON_UNKNOWN, + EFX_HWMON_TEMP, /* temperature */ + EFX_HWMON_COOL, /* cooling device, probably a heatsink */ + EFX_HWMON_IN /* input voltage */ +}; + +static const struct { + const char *label; + enum efx_hwmon_type hwmon_type; + int port; +} efx_mcdi_sensor_type[MC_CMD_SENSOR_ENTRY_MAXNUM] = { +#define SENSOR(name, label, hwmon_type, port) \ + [MC_CMD_SENSOR_##name] = { label, hwmon_type, port } + SENSOR(CONTROLLER_TEMP, "Controller temp.", EFX_HWMON_TEMP, -1), + SENSOR(PHY_COMMON_TEMP, "PHY temp.", EFX_HWMON_TEMP, -1), + SENSOR(CONTROLLER_COOLING, "Controller cooling", EFX_HWMON_COOL, -1), + SENSOR(PHY0_TEMP, "PHY temp.", EFX_HWMON_TEMP, 0), + SENSOR(PHY0_COOLING, "PHY cooling", EFX_HWMON_COOL, 0), + SENSOR(PHY1_TEMP, "PHY temp.", EFX_HWMON_TEMP, 1), + SENSOR(PHY1_COOLING, "PHY cooling", EFX_HWMON_COOL, 1), + SENSOR(IN_1V0, "1.0V supply", EFX_HWMON_IN, -1), + SENSOR(IN_1V2, "1.2V supply", EFX_HWMON_IN, -1), + SENSOR(IN_1V8, "1.8V supply", EFX_HWMON_IN, -1), + SENSOR(IN_2V5, "2.5V supply", EFX_HWMON_IN, -1), + SENSOR(IN_3V3, "3.3V supply", EFX_HWMON_IN, -1), + SENSOR(IN_12V0, "12.0V supply", EFX_HWMON_IN, -1), + SENSOR(IN_1V2A, "1.2V analogue supply", EFX_HWMON_IN, -1), + SENSOR(IN_VREF, "ref. voltage", EFX_HWMON_IN, -1), +#undef SENSOR +}; + +static const char *const sensor_status_names[] = { + [MC_CMD_SENSOR_STATE_OK] = "OK", + [MC_CMD_SENSOR_STATE_WARNING] = "Warning", + [MC_CMD_SENSOR_STATE_FATAL] = "Fatal", + [MC_CMD_SENSOR_STATE_BROKEN] = "Device failure", +}; + +void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev) +{ + unsigned int type, state, value; + const char *name = NULL, *state_txt; + + type = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_MONITOR); + state = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_STATE); + value = EFX_QWORD_FIELD(*ev, MCDI_EVENT_SENSOREVT_VALUE); + + /* Deal gracefully with the board having more drivers than we + * know about, but do not expect new sensor states. */ + if (type < ARRAY_SIZE(efx_mcdi_sensor_type)) + name = efx_mcdi_sensor_type[type].label; + if (!name) + name = "No sensor name available"; + EFX_BUG_ON_PARANOID(state >= ARRAY_SIZE(sensor_status_names)); + state_txt = sensor_status_names[state]; + + netif_err(efx, hw, efx->net_dev, + "Sensor %d (%s) reports condition '%s' for raw value %d\n", + type, name, state_txt, value); +} + +#ifdef CONFIG_SFC_MCDI_MON + +struct efx_mcdi_mon_attribute { + struct device_attribute dev_attr; + unsigned int index; + unsigned int type; + unsigned int limit_value; + char name[12]; +}; + +static int efx_mcdi_mon_update(struct efx_nic *efx) +{ + struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx); + u8 inbuf[MC_CMD_READ_SENSORS_IN_LEN]; + int rc; + + MCDI_SET_DWORD(inbuf, READ_SENSORS_IN_DMA_ADDR_LO, + hwmon->dma_buf.dma_addr & 0xffffffff); + MCDI_SET_DWORD(inbuf, READ_SENSORS_IN_DMA_ADDR_HI, + (u64)hwmon->dma_buf.dma_addr >> 32); + + rc = efx_mcdi_rpc(efx, MC_CMD_READ_SENSORS, + inbuf, sizeof(inbuf), NULL, 0, NULL); + if (rc == 0) + hwmon->last_update = jiffies; + return rc; +} + +static ssize_t efx_mcdi_mon_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%s\n", KBUILD_MODNAME); +} + +static int efx_mcdi_mon_get_entry(struct device *dev, unsigned int index, + efx_dword_t *entry) +{ + struct efx_nic *efx = dev_get_drvdata(dev); + struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx); + int rc; + + BUILD_BUG_ON(MC_CMD_READ_SENSORS_OUT_LEN != 0); + + mutex_lock(&hwmon->update_lock); + + /* Use cached value if last update was < 1 s ago */ + if (time_before(jiffies, hwmon->last_update + HZ)) + rc = 0; + else + rc = efx_mcdi_mon_update(efx); + + /* Copy out the requested entry */ + *entry = ((efx_dword_t *)hwmon->dma_buf.addr)[index]; + + mutex_unlock(&hwmon->update_lock); + + return rc; +} + +static ssize_t efx_mcdi_mon_show_value(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct efx_mcdi_mon_attribute *mon_attr = + container_of(attr, struct efx_mcdi_mon_attribute, dev_attr); + efx_dword_t entry; + unsigned int value; + int rc; + + rc = efx_mcdi_mon_get_entry(dev, mon_attr->index, &entry); + if (rc) + return rc; + + value = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_VALUE); + + /* Convert temperature from degrees to milli-degrees Celsius */ + if (efx_mcdi_sensor_type[mon_attr->type].hwmon_type == EFX_HWMON_TEMP) + value *= 1000; + + return sprintf(buf, "%u\n", value); +} + +static ssize_t efx_mcdi_mon_show_limit(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct efx_mcdi_mon_attribute *mon_attr = + container_of(attr, struct efx_mcdi_mon_attribute, dev_attr); + unsigned int value; + + value = mon_attr->limit_value; + + /* Convert temperature from degrees to milli-degrees Celsius */ + if (efx_mcdi_sensor_type[mon_attr->type].hwmon_type == EFX_HWMON_TEMP) + value *= 1000; + + return sprintf(buf, "%u\n", value); +} + +static ssize_t efx_mcdi_mon_show_alarm(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct efx_mcdi_mon_attribute *mon_attr = + container_of(attr, struct efx_mcdi_mon_attribute, dev_attr); + efx_dword_t entry; + int state; + int rc; + + rc = efx_mcdi_mon_get_entry(dev, mon_attr->index, &entry); + if (rc) + return rc; + + state = EFX_DWORD_FIELD(entry, MC_CMD_SENSOR_VALUE_ENTRY_TYPEDEF_STATE); + return sprintf(buf, "%d\n", state != MC_CMD_SENSOR_STATE_OK); +} + +static ssize_t efx_mcdi_mon_show_label(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct efx_mcdi_mon_attribute *mon_attr = + container_of(attr, struct efx_mcdi_mon_attribute, dev_attr); + return sprintf(buf, "%s\n", + efx_mcdi_sensor_type[mon_attr->type].label); +} + +static int +efx_mcdi_mon_add_attr(struct efx_nic *efx, const char *name, + ssize_t (*reader)(struct device *, + struct device_attribute *, char *), + unsigned int index, unsigned int type, + unsigned int limit_value) +{ + struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx); + struct efx_mcdi_mon_attribute *attr = &hwmon->attrs[hwmon->n_attrs]; + int rc; + + strlcpy(attr->name, name, sizeof(attr->name)); + attr->index = index; + attr->type = type; + attr->limit_value = limit_value; + attr->dev_attr.attr.name = attr->name; + attr->dev_attr.attr.mode = S_IRUGO; + attr->dev_attr.show = reader; + rc = device_create_file(&efx->pci_dev->dev, &attr->dev_attr); + if (rc == 0) + ++hwmon->n_attrs; + return rc; +} + +int efx_mcdi_mon_probe(struct efx_nic *efx) +{ + struct efx_mcdi_mon *hwmon = efx_mcdi_mon(efx); + unsigned int n_attrs, n_temp = 0, n_cool = 0, n_in = 0; + u8 outbuf[MC_CMD_SENSOR_INFO_OUT_LENMAX]; + size_t outlen; + char name[12]; + u32 mask; + int rc, i, type; + + BUILD_BUG_ON(MC_CMD_SENSOR_INFO_IN_LEN != 0); + + rc = efx_mcdi_rpc(efx, MC_CMD_SENSOR_INFO, NULL, 0, + outbuf, sizeof(outbuf), &outlen); + if (rc) + return rc; + if (outlen < MC_CMD_SENSOR_INFO_OUT_LENMIN) + return -EIO; + + /* Find out which sensors are present. Don't create a device + * if there are none. + */ + mask = MCDI_DWORD(outbuf, SENSOR_INFO_OUT_MASK); + if (mask == 0) + return 0; + + /* Check again for short response */ + if (outlen < MC_CMD_SENSOR_INFO_OUT_LEN(hweight32(mask))) + return -EIO; + + rc = efx_nic_alloc_buffer(efx, &hwmon->dma_buf, + 4 * MC_CMD_SENSOR_ENTRY_MAXNUM); + if (rc) + return rc; + + mutex_init(&hwmon->update_lock); + efx_mcdi_mon_update(efx); + + /* Allocate space for the maximum possible number of + * attributes for this set of sensors: name of the driver plus + * value, min, max, crit, alarm and label for each sensor. + */ + n_attrs = 1 + 6 * hweight32(mask); + hwmon->attrs = kcalloc(n_attrs, sizeof(*hwmon->attrs), GFP_KERNEL); + if (!hwmon->attrs) { + rc = -ENOMEM; + goto fail; + } + + hwmon->device = hwmon_device_register(&efx->pci_dev->dev); + if (IS_ERR(hwmon->device)) { + rc = PTR_ERR(hwmon->device); + goto fail; + } + + rc = efx_mcdi_mon_add_attr(efx, "name", efx_mcdi_mon_show_name, 0, 0, 0); + if (rc) + goto fail; + + for (i = 0, type = -1; ; i++) { + const char *hwmon_prefix; + unsigned hwmon_index; + u16 min1, max1, min2, max2; + + /* Find next sensor type or exit if there is none */ + type++; + while (!(mask & (1 << type))) { + type++; + if (type == 32) + return 0; + } + + /* Skip sensors specific to a different port */ + if (efx_mcdi_sensor_type[type].hwmon_type != EFX_HWMON_UNKNOWN && + efx_mcdi_sensor_type[type].port >= 0 && + efx_mcdi_sensor_type[type].port != efx_port_num(efx)) + continue; + + switch (efx_mcdi_sensor_type[type].hwmon_type) { + case EFX_HWMON_TEMP: + hwmon_prefix = "temp"; + hwmon_index = ++n_temp; /* 1-based */ + break; + case EFX_HWMON_COOL: + /* This is likely to be a heatsink, but there + * is no convention for representing cooling + * devices other than fans. + */ + hwmon_prefix = "fan"; + hwmon_index = ++n_cool; /* 1-based */ + break; + default: + hwmon_prefix = "in"; + hwmon_index = n_in++; /* 0-based */ + break; + } + + min1 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY, + SENSOR_INFO_ENTRY, i, MIN1); + max1 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY, + SENSOR_INFO_ENTRY, i, MAX1); + min2 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY, + SENSOR_INFO_ENTRY, i, MIN2); + max2 = MCDI_ARRAY_FIELD(outbuf, SENSOR_ENTRY, + SENSOR_INFO_ENTRY, i, MAX2); + + if (min1 != max1) { + snprintf(name, sizeof(name), "%s%u_input", + hwmon_prefix, hwmon_index); + rc = efx_mcdi_mon_add_attr( + efx, name, efx_mcdi_mon_show_value, i, type, 0); + if (rc) + goto fail; + + snprintf(name, sizeof(name), "%s%u_min", + hwmon_prefix, hwmon_index); + rc = efx_mcdi_mon_add_attr( + efx, name, efx_mcdi_mon_show_limit, + i, type, min1); + if (rc) + goto fail; + + snprintf(name, sizeof(name), "%s%u_max", + hwmon_prefix, hwmon_index); + rc = efx_mcdi_mon_add_attr( + efx, name, efx_mcdi_mon_show_limit, + i, type, max1); + if (rc) + goto fail; + + if (min2 != max2) { + /* Assume max2 is critical value. + * But we have no good way to expose min2. + */ + snprintf(name, sizeof(name), "%s%u_crit", + hwmon_prefix, hwmon_index); + rc = efx_mcdi_mon_add_attr( + efx, name, efx_mcdi_mon_show_limit, + i, type, max2); + if (rc) + goto fail; + } + } + + snprintf(name, sizeof(name), "%s%u_alarm", + hwmon_prefix, hwmon_index); + rc = efx_mcdi_mon_add_attr( + efx, name, efx_mcdi_mon_show_alarm, i, type, 0); + if (rc) + goto fail; + + if (efx_mcdi_sensor_type[type].label) { + snprintf(name, sizeof(name), "%s%u_label", + hwmon_prefix, hwmon_index); + rc = efx_mcdi_mon_add_attr( + efx, name, efx_mcdi_mon_show_label, i, type, 0); + if (rc) + goto fail; + } + } + +fail: + efx_mcdi_mon_remove(efx); + return rc; +} + +void efx_mcdi_mon_remove(struct efx_nic *efx) +{ + struct siena_nic_data *nic_data = efx->nic_data; + struct efx_mcdi_mon *hwmon = &nic_data->hwmon; + unsigned int i; + + for (i = 0; i < hwmon->n_attrs; i++) + device_remove_file(&efx->pci_dev->dev, + &hwmon->attrs[i].dev_attr); + kfree(hwmon->attrs); + if (hwmon->device) + hwmon_device_unregister(hwmon->device); + efx_nic_free_buffer(efx, &hwmon->dma_buf); +} + +#endif /* CONFIG_SFC_MCDI_MON */ |