diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_hwmon.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_hwmon.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index 49db3e09826c..17d30f6b84b0 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -5,6 +5,7 @@ #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> +#include <linux/jiffies.h> #include <linux/types.h> #include "i915_drv.h" @@ -36,6 +37,7 @@ struct hwm_reg { i915_reg_t pkg_rapl_limit; i915_reg_t energy_status_all; i915_reg_t energy_status_tile; + i915_reg_t fan_speed; }; struct hwm_energy_info { @@ -43,11 +45,17 @@ struct hwm_energy_info { long accum_energy; /* Accumulated energy for energy1_input */ }; +struct hwm_fan_info { + u32 reg_val_prev; + u64 time_prev; +}; + struct hwm_drvdata { struct i915_hwmon *hwmon; struct intel_uncore *uncore; struct device *hwmon_dev; struct hwm_energy_info ei; /* Energy info for energy1_input */ + struct hwm_fan_info fi; /* Fan info for fan1_input */ char name[12]; int gt_n; bool reset_in_progress; @@ -276,6 +284,7 @@ static const struct hwmon_channel_info * const hwm_info[] = { HWMON_CHANNEL_INFO(power, HWMON_P_MAX | HWMON_P_RATED_MAX | HWMON_P_CRIT), HWMON_CHANNEL_INFO(energy, HWMON_E_INPUT), HWMON_CHANNEL_INFO(curr, HWMON_C_CRIT), + HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT), NULL }; @@ -614,6 +623,69 @@ hwm_curr_write(struct hwm_drvdata *ddat, u32 attr, long val) } static umode_t +hwm_fan_is_visible(const struct hwm_drvdata *ddat, u32 attr) +{ + struct i915_hwmon *hwmon = ddat->hwmon; + + if (attr == hwmon_fan_input && i915_mmio_reg_valid(hwmon->rg.fan_speed)) + return 0444; + + return 0; +} + +static int +hwm_fan_input_read(struct hwm_drvdata *ddat, long *val) +{ + struct i915_hwmon *hwmon = ddat->hwmon; + struct hwm_fan_info *fi = &ddat->fi; + u64 rotations, time_now, time; + intel_wakeref_t wakeref; + u32 reg_val; + int ret = 0; + + wakeref = intel_runtime_pm_get(ddat->uncore->rpm); + mutex_lock(&hwmon->hwmon_lock); + + reg_val = intel_uncore_read(ddat->uncore, hwmon->rg.fan_speed); + time_now = get_jiffies_64(); + + /* + * HW register value is accumulated count of pulses from + * PWM fan with the scale of 2 pulses per rotation. + */ + rotations = (reg_val - fi->reg_val_prev) / 2; + + time = jiffies_delta_to_msecs(time_now - fi->time_prev); + if (unlikely(!time)) { + ret = -EAGAIN; + goto exit; + } + + /* + * Calculate fan speed in RPM by time averaging two subsequent + * readings in minutes. + * RPM = number of rotations * msecs per minute / time in msecs + */ + *val = DIV_ROUND_UP_ULL(rotations * (MSEC_PER_SEC * 60), time); + + fi->reg_val_prev = reg_val; + fi->time_prev = time_now; +exit: + mutex_unlock(&hwmon->hwmon_lock); + intel_runtime_pm_put(ddat->uncore->rpm, wakeref); + return ret; +} + +static int +hwm_fan_read(struct hwm_drvdata *ddat, u32 attr, long *val) +{ + if (attr == hwmon_fan_input) + return hwm_fan_input_read(ddat, val); + + return -EOPNOTSUPP; +} + +static umode_t hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, int channel) { @@ -628,6 +700,8 @@ hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, return hwm_energy_is_visible(ddat, attr); case hwmon_curr: return hwm_curr_is_visible(ddat, attr); + case hwmon_fan: + return hwm_fan_is_visible(ddat, attr); default: return 0; } @@ -648,6 +722,8 @@ hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, return hwm_energy_read(ddat, attr, val); case hwmon_curr: return hwm_curr_read(ddat, attr, val); + case hwmon_fan: + return hwm_fan_read(ddat, attr, val); default: return -EOPNOTSUPP; } @@ -739,12 +815,14 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) hwmon->rg.pkg_rapl_limit = PCU_PACKAGE_RAPL_LIMIT; hwmon->rg.energy_status_all = PCU_PACKAGE_ENERGY_STATUS; hwmon->rg.energy_status_tile = INVALID_MMIO_REG; + hwmon->rg.fan_speed = PCU_PWM_FAN_SPEED; } else { hwmon->rg.pkg_power_sku_unit = INVALID_MMIO_REG; hwmon->rg.pkg_power_sku = INVALID_MMIO_REG; hwmon->rg.pkg_rapl_limit = INVALID_MMIO_REG; hwmon->rg.energy_status_all = INVALID_MMIO_REG; hwmon->rg.energy_status_tile = INVALID_MMIO_REG; + hwmon->rg.fan_speed = INVALID_MMIO_REG; } with_intel_runtime_pm(uncore->rpm, wakeref) { @@ -755,6 +833,16 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) if (i915_mmio_reg_valid(hwmon->rg.pkg_power_sku_unit)) val_sku_unit = intel_uncore_read(uncore, hwmon->rg.pkg_power_sku_unit); + + /* + * Store the initial fan register value, so that we can use it for + * initial fan speed calculation. + */ + if (i915_mmio_reg_valid(hwmon->rg.fan_speed)) { + ddat->fi.reg_val_prev = intel_uncore_read(uncore, + hwmon->rg.fan_speed); + ddat->fi.time_prev = get_jiffies_64(); + } } hwmon->scl_shift_power = REG_FIELD_GET(PKG_PWR_UNIT, val_sku_unit); |