diff options
| -rw-r--r-- | drivers/hwmon/occ/Makefile | 4 | ||||
| -rw-r--r-- | drivers/hwmon/occ/common.c | 45 | ||||
| -rw-r--r-- | drivers/hwmon/occ/common.h | 17 | ||||
| -rw-r--r-- | drivers/hwmon/occ/p8_i2c.c | 10 | ||||
| -rw-r--r-- | drivers/hwmon/occ/p9_sbe.c | 1 | ||||
| -rw-r--r-- | drivers/hwmon/occ/sysfs.c | 188 |
6 files changed, 260 insertions, 5 deletions
diff --git a/drivers/hwmon/occ/Makefile b/drivers/hwmon/occ/Makefile index 57c0e911005b..3fec12ddc7e7 100644 --- a/drivers/hwmon/occ/Makefile +++ b/drivers/hwmon/occ/Makefile @@ -1,5 +1,5 @@ -occ-p8-hwmon-objs := common.o p8_i2c.o -occ-p9-hwmon-objs := common.o p9_sbe.o +occ-p8-hwmon-objs := common.o sysfs.o p8_i2c.o +occ-p9-hwmon-objs := common.o sysfs.o p9_sbe.o obj-$(CONFIG_SENSORS_OCC_P8_I2C) += occ-p8-hwmon.o obj-$(CONFIG_SENSORS_OCC_P9_SBE) += occ-p9-hwmon.o diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c index c6c816135f67..423903f87955 100644 --- a/drivers/hwmon/occ/common.c +++ b/drivers/hwmon/occ/common.c @@ -14,6 +14,11 @@ #define EXTN_FLAG_SENSOR_ID BIT(7) +#define OCC_ERROR_COUNT_THRESHOLD 2 /* required by OCC spec */ + +#define OCC_STATE_SAFE 4 +#define OCC_SAFE_TIMEOUT msecs_to_jiffies(60000) /* 1 min */ + #define OCC_UPDATE_FREQUENCY msecs_to_jiffies(1000) #define OCC_TEMP_SENSOR_FAULT 0xFF @@ -115,8 +120,10 @@ struct extended_sensor { static int occ_poll(struct occ *occ) { + int rc; u16 checksum = occ->poll_cmd_data + 1; u8 cmd[8]; + struct occ_poll_response_header *header; /* big endian */ cmd[0] = 0; /* sequence number */ @@ -129,7 +136,35 @@ static int occ_poll(struct occ *occ) cmd[7] = 0; /* mutex should already be locked if necessary */ - return occ->send_cmd(occ, cmd); + rc = occ->send_cmd(occ, cmd); + if (rc) { + if (occ->error_count++ > OCC_ERROR_COUNT_THRESHOLD) + occ->error = rc; + + goto done; + } + + /* clear error since communication was successful */ + occ->error_count = 0; + occ->error = 0; + + /* check for safe state */ + header = (struct occ_poll_response_header *)occ->resp.data; + if (header->occ_state == OCC_STATE_SAFE) { + if (occ->last_safe) { + if (time_after(jiffies, + occ->last_safe + OCC_SAFE_TIMEOUT)) + occ->error = -EHOSTDOWN; + } else { + occ->last_safe = jiffies; + } + } else { + occ->last_safe = 0; + } + +done: + occ_sysfs_poll_done(occ); + return rc; } static int occ_set_user_power_cap(struct occ *occ, u16 user_power_cap) @@ -161,7 +196,7 @@ static int occ_set_user_power_cap(struct occ *occ, u16 user_power_cap) return rc; } -static int occ_update_response(struct occ *occ) +int occ_update_response(struct occ *occ) { int rc = mutex_lock_interruptible(&occ->lock); @@ -1055,5 +1090,9 @@ int occ_setup(struct occ *occ, const char *name) return rc; } - return 0; + rc = occ_setup_sysfs(occ); + if (rc) + dev_err(occ->bus_dev, "failed to setup sysfs: %d\n", rc); + + return rc; } diff --git a/drivers/hwmon/occ/common.h b/drivers/hwmon/occ/common.h index 9d01973d93d8..7c44df3f5631 100644 --- a/drivers/hwmon/occ/common.h +++ b/drivers/hwmon/occ/common.h @@ -104,8 +104,25 @@ struct occ { struct occ_attribute *attrs; struct attribute_group group; const struct attribute_group *groups[2]; + + int error; /* latest transfer error */ + unsigned int error_count; /* number of xfr errors observed */ + unsigned long last_safe; /* time OCC entered "safe" state */ + + /* + * Store the previous state data for comparison in order to notify + * sysfs readers of state changes. + */ + int prev_error; + u8 prev_stat; + u8 prev_ext_stat; + u8 prev_occs_present; }; int occ_setup(struct occ *occ, const char *name); +int occ_setup_sysfs(struct occ *occ); +void occ_shutdown(struct occ *occ); +void occ_sysfs_poll_done(struct occ *occ); +int occ_update_response(struct occ *occ); #endif /* OCC_COMMON_H */ diff --git a/drivers/hwmon/occ/p8_i2c.c b/drivers/hwmon/occ/p8_i2c.c index e4c2c047b99c..b59efc945e54 100644 --- a/drivers/hwmon/occ/p8_i2c.c +++ b/drivers/hwmon/occ/p8_i2c.c @@ -223,6 +223,15 @@ static int p8_i2c_occ_probe(struct i2c_client *client, return occ_setup(occ, "p8_occ"); } +static int p8_i2c_occ_remove(struct i2c_client *client) +{ + struct occ *occ = dev_get_drvdata(&client->dev); + + occ_shutdown(occ); + + return 0; +} + static const struct of_device_id p8_i2c_occ_of_match[] = { { .compatible = "ibm,p8-occ-hwmon" }, {} @@ -236,6 +245,7 @@ static struct i2c_driver p8_i2c_occ_driver = { .of_match_table = p8_i2c_occ_of_match, }, .probe = p8_i2c_occ_probe, + .remove = p8_i2c_occ_remove, }; module_i2c_driver(p8_i2c_occ_driver); diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c index b33f4fe63fbb..b65c1d1dfb54 100644 --- a/drivers/hwmon/occ/p9_sbe.c +++ b/drivers/hwmon/occ/p9_sbe.c @@ -86,6 +86,7 @@ static int p9_sbe_occ_remove(struct platform_device *pdev) struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ); ctx->sbe = NULL; + occ_shutdown(occ); return 0; } diff --git a/drivers/hwmon/occ/sysfs.c b/drivers/hwmon/occ/sysfs.c new file mode 100644 index 000000000000..743b26ec8e54 --- /dev/null +++ b/drivers/hwmon/occ/sysfs.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * OCC hwmon driver sysfs interface + * + * Copyright (C) IBM Corporation 2018 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/hwmon-sysfs.h> +#include <linux/kernel.h> +#include <linux/sysfs.h> + +#include "common.h" + +/* OCC status register */ +#define OCC_STAT_MASTER BIT(7) +#define OCC_STAT_ACTIVE BIT(0) + +/* OCC extended status register */ +#define OCC_EXT_STAT_DVFS_OT BIT(7) +#define OCC_EXT_STAT_DVFS_POWER BIT(6) +#define OCC_EXT_STAT_MEM_THROTTLE BIT(5) +#define OCC_EXT_STAT_QUICK_DROP BIT(4) + +static ssize_t occ_sysfs_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int rc; + int val = 0; + struct occ *occ = dev_get_drvdata(dev); + struct occ_poll_response_header *header; + struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); + + rc = occ_update_response(occ); + if (rc) + return rc; + + header = (struct occ_poll_response_header *)occ->resp.data; + + switch (sattr->index) { + case 0: + val = !!(header->status & OCC_STAT_MASTER); + break; + case 1: + val = !!(header->status & OCC_STAT_ACTIVE); + break; + case 2: + val = !!(header->status & OCC_EXT_STAT_DVFS_OT); + break; + case 3: + val = !!(header->status & OCC_EXT_STAT_DVFS_POWER); + break; + case 4: + val = !!(header->status & OCC_EXT_STAT_MEM_THROTTLE); + break; + case 5: + val = !!(header->status & OCC_EXT_STAT_QUICK_DROP); + break; + case 6: + val = header->occ_state; + break; + case 7: + if (header->status & OCC_STAT_MASTER) + val = hweight8(header->occs_present); + else + val = 1; + break; + case 8: + val = occ->error; + break; + default: + return -EINVAL; + } + + return snprintf(buf, PAGE_SIZE - 1, "%d\n", val); +} + +static SENSOR_DEVICE_ATTR(occ_master, 0444, occ_sysfs_show, NULL, 0); +static SENSOR_DEVICE_ATTR(occ_active, 0444, occ_sysfs_show, NULL, 1); +static SENSOR_DEVICE_ATTR(occ_dvfs_overtemp, 0444, occ_sysfs_show, NULL, 2); +static SENSOR_DEVICE_ATTR(occ_dvfs_power, 0444, occ_sysfs_show, NULL, 3); +static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_sysfs_show, NULL, 4); +static SENSOR_DEVICE_ATTR(occ_quick_pwr_drop, 0444, occ_sysfs_show, NULL, 5); +static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6); +static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7); +static SENSOR_DEVICE_ATTR(occ_error, 0444, occ_sysfs_show, NULL, 8); + +static struct attribute *occ_attributes[] = { + &sensor_dev_attr_occ_master.dev_attr.attr, + &sensor_dev_attr_occ_active.dev_attr.attr, + &sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr, + &sensor_dev_attr_occ_dvfs_power.dev_attr.attr, + &sensor_dev_attr_occ_mem_throttle.dev_attr.attr, + &sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr, + &sensor_dev_attr_occ_state.dev_attr.attr, + &sensor_dev_attr_occs_present.dev_attr.attr, + &sensor_dev_attr_occ_error.dev_attr.attr, + NULL +}; + +static const struct attribute_group occ_sysfs = { + .attrs = occ_attributes, +}; + +void occ_sysfs_poll_done(struct occ *occ) +{ + const char *name; + struct occ_poll_response_header *header = + (struct occ_poll_response_header *)occ->resp.data; + + /* + * On the first poll response, we haven't yet created the sysfs + * attributes, so don't make any notify calls. + */ + if (!occ->hwmon) + goto done; + + if ((header->status & OCC_STAT_MASTER) != + (occ->prev_stat & OCC_STAT_MASTER)) { + name = sensor_dev_attr_occ_master.dev_attr.attr.name; + sysfs_notify(&occ->bus_dev->kobj, NULL, name); + } + + if ((header->status & OCC_STAT_ACTIVE) != + (occ->prev_stat & OCC_STAT_ACTIVE)) { + name = sensor_dev_attr_occ_active.dev_attr.attr.name; + sysfs_notify(&occ->bus_dev->kobj, NULL, name); + } + + if ((header->ext_status & OCC_EXT_STAT_DVFS_OT) != + (occ->prev_ext_stat & OCC_EXT_STAT_DVFS_OT)) { + name = sensor_dev_attr_occ_dvfs_overtemp.dev_attr.attr.name; + sysfs_notify(&occ->bus_dev->kobj, NULL, name); + } + + if ((header->ext_status & OCC_EXT_STAT_DVFS_POWER) != + (occ->prev_ext_stat & OCC_EXT_STAT_DVFS_POWER)) { + name = sensor_dev_attr_occ_dvfs_power.dev_attr.attr.name; + sysfs_notify(&occ->bus_dev->kobj, NULL, name); + } + + if ((header->ext_status & OCC_EXT_STAT_MEM_THROTTLE) != + (occ->prev_ext_stat & OCC_EXT_STAT_MEM_THROTTLE)) { + name = sensor_dev_attr_occ_mem_throttle.dev_attr.attr.name; + sysfs_notify(&occ->bus_dev->kobj, NULL, name); + } + + if ((header->ext_status & OCC_EXT_STAT_QUICK_DROP) != + (occ->prev_ext_stat & OCC_EXT_STAT_QUICK_DROP)) { + name = sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr.name; + sysfs_notify(&occ->bus_dev->kobj, NULL, name); + } + + if ((header->status & OCC_STAT_MASTER) && + header->occs_present != occ->prev_occs_present) { + name = sensor_dev_attr_occs_present.dev_attr.attr.name; + sysfs_notify(&occ->bus_dev->kobj, NULL, name); + } + + if (occ->error && occ->error != occ->prev_error) { + name = sensor_dev_attr_occ_error.dev_attr.attr.name; + sysfs_notify(&occ->bus_dev->kobj, NULL, name); + } + + /* no notifications for OCC state; doesn't indicate error condition */ + +done: + occ->prev_error = occ->error; + occ->prev_stat = header->status; + occ->prev_ext_stat = header->ext_status; + occ->prev_occs_present = header->occs_present; +} + +int occ_setup_sysfs(struct occ *occ) +{ + return sysfs_create_group(&occ->bus_dev->kobj, &occ_sysfs); +} + +void occ_shutdown(struct occ *occ) +{ + sysfs_remove_group(&occ->bus_dev->kobj, &occ_sysfs); +} |