From fddc9fcbe69a502d84adf0bad5e2c6c80823838c Mon Sep 17 00:00:00 2001 From: Wu Hao Date: Mon, 14 Oct 2019 13:42:03 +0800 Subject: fpga: dfl: fme: add power management support This patch adds support for power management private feature under FPGA Management Engine (FME). This private feature driver registers a hwmon for power (power1_input), thresholds information, e.g. (power1_max / crit / max_alarm / crit_alarm) and also read-only sysfs interfaces for other power management information. For configuration, user could write threshold values via above power1_max / crit sysfs interface under hwmon too. Signed-off-by: Luwei Kang Signed-off-by: Xu Yilun Signed-off-by: Wu Hao Acked-by: Guenter Roeck Reviewed-by: Moritz Fischer Signed-off-by: Moritz Fischer --- drivers/fpga/dfl-fme-main.c | 207 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 207 insertions(+) (limited to 'drivers') diff --git a/drivers/fpga/dfl-fme-main.c b/drivers/fpga/dfl-fme-main.c index 752d71c1748e..7c930e6b314d 100644 --- a/drivers/fpga/dfl-fme-main.c +++ b/drivers/fpga/dfl-fme-main.c @@ -355,6 +355,209 @@ static const struct dfl_feature_ops fme_thermal_mgmt_ops = { .init = fme_thermal_mgmt_init, }; +#define FME_PWR_STATUS 0x8 +#define FME_LATENCY_TOLERANCE BIT_ULL(18) +#define PWR_CONSUMED GENMASK_ULL(17, 0) + +#define FME_PWR_THRESHOLD 0x10 +#define PWR_THRESHOLD1 GENMASK_ULL(6, 0) /* in Watts */ +#define PWR_THRESHOLD2 GENMASK_ULL(14, 8) /* in Watts */ +#define PWR_THRESHOLD_MAX 0x7f /* in Watts */ +#define PWR_THRESHOLD1_STATUS BIT_ULL(16) +#define PWR_THRESHOLD2_STATUS BIT_ULL(17) + +#define FME_PWR_XEON_LIMIT 0x18 +#define XEON_PWR_LIMIT GENMASK_ULL(14, 0) /* in 0.1 Watts */ +#define XEON_PWR_EN BIT_ULL(15) +#define FME_PWR_FPGA_LIMIT 0x20 +#define FPGA_PWR_LIMIT GENMASK_ULL(14, 0) /* in 0.1 Watts */ +#define FPGA_PWR_EN BIT_ULL(15) + +static int power_hwmon_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct dfl_feature *feature = dev_get_drvdata(dev); + u64 v; + + switch (attr) { + case hwmon_power_input: + v = readq(feature->ioaddr + FME_PWR_STATUS); + *val = (long)(FIELD_GET(PWR_CONSUMED, v) * 1000000); + break; + case hwmon_power_max: + v = readq(feature->ioaddr + FME_PWR_THRESHOLD); + *val = (long)(FIELD_GET(PWR_THRESHOLD1, v) * 1000000); + break; + case hwmon_power_crit: + v = readq(feature->ioaddr + FME_PWR_THRESHOLD); + *val = (long)(FIELD_GET(PWR_THRESHOLD2, v) * 1000000); + break; + case hwmon_power_max_alarm: + v = readq(feature->ioaddr + FME_PWR_THRESHOLD); + *val = (long)FIELD_GET(PWR_THRESHOLD1_STATUS, v); + break; + case hwmon_power_crit_alarm: + v = readq(feature->ioaddr + FME_PWR_THRESHOLD); + *val = (long)FIELD_GET(PWR_THRESHOLD2_STATUS, v); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int power_hwmon_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + struct dfl_feature_platform_data *pdata = dev_get_platdata(dev->parent); + struct dfl_feature *feature = dev_get_drvdata(dev); + int ret = 0; + u64 v; + + val = clamp_val(val / 1000000, 0, PWR_THRESHOLD_MAX); + + mutex_lock(&pdata->lock); + + switch (attr) { + case hwmon_power_max: + v = readq(feature->ioaddr + FME_PWR_THRESHOLD); + v &= ~PWR_THRESHOLD1; + v |= FIELD_PREP(PWR_THRESHOLD1, val); + writeq(v, feature->ioaddr + FME_PWR_THRESHOLD); + break; + case hwmon_power_crit: + v = readq(feature->ioaddr + FME_PWR_THRESHOLD); + v &= ~PWR_THRESHOLD2; + v |= FIELD_PREP(PWR_THRESHOLD2, val); + writeq(v, feature->ioaddr + FME_PWR_THRESHOLD); + break; + default: + ret = -EOPNOTSUPP; + break; + } + + mutex_unlock(&pdata->lock); + + return ret; +} + +static umode_t power_hwmon_attrs_visible(const void *drvdata, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (attr) { + case hwmon_power_input: + case hwmon_power_max_alarm: + case hwmon_power_crit_alarm: + return 0444; + case hwmon_power_max: + case hwmon_power_crit: + return 0644; + } + + return 0; +} + +static const struct hwmon_ops power_hwmon_ops = { + .is_visible = power_hwmon_attrs_visible, + .read = power_hwmon_read, + .write = power_hwmon_write, +}; + +static const struct hwmon_channel_info *power_hwmon_info[] = { + HWMON_CHANNEL_INFO(power, HWMON_P_INPUT | + HWMON_P_MAX | HWMON_P_MAX_ALARM | + HWMON_P_CRIT | HWMON_P_CRIT_ALARM), + NULL +}; + +static const struct hwmon_chip_info power_hwmon_chip_info = { + .ops = &power_hwmon_ops, + .info = power_hwmon_info, +}; + +static ssize_t power1_xeon_limit_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dfl_feature *feature = dev_get_drvdata(dev); + u16 xeon_limit = 0; + u64 v; + + v = readq(feature->ioaddr + FME_PWR_XEON_LIMIT); + + if (FIELD_GET(XEON_PWR_EN, v)) + xeon_limit = FIELD_GET(XEON_PWR_LIMIT, v); + + return sprintf(buf, "%u\n", xeon_limit * 100000); +} + +static ssize_t power1_fpga_limit_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dfl_feature *feature = dev_get_drvdata(dev); + u16 fpga_limit = 0; + u64 v; + + v = readq(feature->ioaddr + FME_PWR_FPGA_LIMIT); + + if (FIELD_GET(FPGA_PWR_EN, v)) + fpga_limit = FIELD_GET(FPGA_PWR_LIMIT, v); + + return sprintf(buf, "%u\n", fpga_limit * 100000); +} + +static ssize_t power1_ltr_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dfl_feature *feature = dev_get_drvdata(dev); + u64 v; + + v = readq(feature->ioaddr + FME_PWR_STATUS); + + return sprintf(buf, "%u\n", + (unsigned int)FIELD_GET(FME_LATENCY_TOLERANCE, v)); +} + +static DEVICE_ATTR_RO(power1_xeon_limit); +static DEVICE_ATTR_RO(power1_fpga_limit); +static DEVICE_ATTR_RO(power1_ltr); + +static struct attribute *power_extra_attrs[] = { + &dev_attr_power1_xeon_limit.attr, + &dev_attr_power1_fpga_limit.attr, + &dev_attr_power1_ltr.attr, + NULL +}; + +ATTRIBUTE_GROUPS(power_extra); + +static int fme_power_mgmt_init(struct platform_device *pdev, + struct dfl_feature *feature) +{ + struct device *hwmon; + + hwmon = devm_hwmon_device_register_with_info(&pdev->dev, + "dfl_fme_power", feature, + &power_hwmon_chip_info, + power_extra_groups); + if (IS_ERR(hwmon)) { + dev_err(&pdev->dev, "Fail to register power hwmon\n"); + return PTR_ERR(hwmon); + } + + return 0; +} + +static const struct dfl_feature_id fme_power_mgmt_id_table[] = { + {.id = FME_FEATURE_ID_POWER_MGMT,}, + {0,} +}; + +static const struct dfl_feature_ops fme_power_mgmt_ops = { + .init = fme_power_mgmt_init, +}; + static struct dfl_feature_driver fme_feature_drvs[] = { { .id_table = fme_hdr_id_table, @@ -372,6 +575,10 @@ static struct dfl_feature_driver fme_feature_drvs[] = { .id_table = fme_thermal_mgmt_id_table, .ops = &fme_thermal_mgmt_ops, }, + { + .id_table = fme_power_mgmt_id_table, + .ops = &fme_power_mgmt_ops, + }, { .ops = NULL, }, -- cgit v1.2.3