#include <linux/hwmon-sysfs.h>
#include <linux/hwmon.h>
+#include <linux/jiffies.h>
#include <linux/types.h>
#include <linux/units.h>
REG_PKG_POWER_SKU_UNIT,
REG_GT_PERF_STATUS,
REG_PKG_ENERGY_STATUS,
+ REG_FAN_SPEED,
};
enum xe_hwmon_reg_operation {
CHANNEL_MAX,
};
+enum xe_fan_channel {
+ FAN_1,
+ FAN_2,
+ FAN_3,
+ FAN_MAX,
+};
+
/*
* SF_* - scale factors for particular quantities according to hwmon spec.
*/
long accum_energy;
};
+/**
+ * struct xe_hwmon_fan_info - to cache previous fan reading
+ */
+struct xe_hwmon_fan_info {
+ /** @reg_val_prev: previous fan reg val */
+ u32 reg_val_prev;
+ /** @time_prev: previous timestamp */
+ u64 time_prev;
+};
+
/**
* struct xe_hwmon - xe hwmon data structure
*/
int scl_shift_time;
/** @ei: Energy info for energyN_input */
struct xe_hwmon_energy_info ei[CHANNEL_MAX];
+ /** @fi: Fan info for fanN_input */
+ struct xe_hwmon_fan_info fi[FAN_MAX];
};
static struct xe_reg xe_hwmon_get_reg(struct xe_hwmon *hwmon, enum xe_hwmon_reg hwmon_reg,
return PCU_CR_PACKAGE_ENERGY_STATUS;
}
break;
+ case REG_FAN_SPEED:
+ if (channel == FAN_1)
+ return BMG_FAN_1_SPEED;
+ else if (channel == FAN_2)
+ return BMG_FAN_2_SPEED;
+ else if (channel == FAN_3)
+ return BMG_FAN_3_SPEED;
+ break;
default:
drm_warn(&xe->drm, "Unknown xe hwmon reg id: %d\n", hwmon_reg);
break;
HWMON_CHANNEL_INFO(curr, HWMON_C_LABEL, HWMON_C_CRIT | HWMON_C_LABEL),
HWMON_CHANNEL_INFO(in, HWMON_I_INPUT | HWMON_I_LABEL, HWMON_I_INPUT | HWMON_I_LABEL),
HWMON_CHANNEL_INFO(energy, HWMON_E_INPUT | HWMON_E_LABEL, HWMON_E_INPUT | HWMON_E_LABEL),
+ HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT, HWMON_F_INPUT, HWMON_F_INPUT),
NULL
};
(uval & POWER_SETUP_I1_DATA_MASK));
}
+static int xe_hwmon_pcode_read_fan_control(const struct xe_hwmon *hwmon, u32 subcmd, u32 *uval)
+{
+ struct xe_tile *root_tile = xe_device_get_root_tile(hwmon->xe);
+
+ /* Platforms that don't return correct value */
+ if (hwmon->xe->info.platform == XE_DG2 && subcmd == FSC_READ_NUM_FANS) {
+ *uval = 2;
+ return 0;
+ }
+
+ return xe_pcode_read(root_tile, PCODE_MBOX(FAN_SPEED_CONTROL, subcmd, 0), uval, NULL);
+}
+
static int xe_hwmon_power_curr_crit_read(struct xe_hwmon *hwmon, int channel,
long *value, u32 scale_factor)
{
}
}
+static umode_t
+xe_hwmon_fan_is_visible(struct xe_hwmon *hwmon, u32 attr, int channel)
+{
+ u32 uval;
+
+ if (!hwmon->xe->info.has_fan_control)
+ return 0;
+
+ switch (attr) {
+ case hwmon_fan_input:
+ if (xe_hwmon_pcode_read_fan_control(hwmon, FSC_READ_NUM_FANS, &uval))
+ return 0;
+
+ return channel < uval ? 0444 : 0;
+ default:
+ return 0;
+ }
+}
+
+static int
+xe_hwmon_fan_input_read(struct xe_hwmon *hwmon, int channel, long *val)
+{
+ struct xe_mmio *mmio = xe_root_tile_mmio(hwmon->xe);
+ struct xe_hwmon_fan_info *fi = &hwmon->fi[channel];
+ u64 rotations, time_now, time;
+ u32 reg_val;
+ int ret = 0;
+
+ mutex_lock(&hwmon->hwmon_lock);
+
+ reg_val = xe_mmio_read32(mmio, xe_hwmon_get_reg(hwmon, REG_FAN_SPEED, channel));
+ 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 unlock;
+ }
+
+ /*
+ * 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;
+unlock:
+ mutex_unlock(&hwmon->hwmon_lock);
+ return ret;
+}
+
+static int
+xe_hwmon_fan_read(struct xe_hwmon *hwmon, u32 attr, int channel, long *val)
+{
+ switch (attr) {
+ case hwmon_fan_input:
+ return xe_hwmon_fan_input_read(hwmon, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
static umode_t
xe_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
u32 attr, int channel)
case hwmon_energy:
ret = xe_hwmon_energy_is_visible(hwmon, attr, channel);
break;
+ case hwmon_fan:
+ ret = xe_hwmon_fan_is_visible(hwmon, attr, channel);
+ break;
default:
ret = 0;
break;
case hwmon_energy:
ret = xe_hwmon_energy_read(hwmon, attr, channel, val);
break;
+ case hwmon_fan:
+ ret = xe_hwmon_fan_read(hwmon, attr, channel, val);
+ break;
default:
ret = -EOPNOTSUPP;
break;
xe_hwmon_get_preregistration_info(struct xe_hwmon *hwmon)
{
struct xe_mmio *mmio = xe_root_tile_mmio(hwmon->xe);
- long energy;
+ long energy, fan_speed;
u64 val_sku_unit = 0;
int channel;
struct xe_reg pkg_power_sku_unit;
for (channel = 0; channel < CHANNEL_MAX; channel++)
if (xe_hwmon_is_visible(hwmon, hwmon_energy, hwmon_energy_input, channel))
xe_hwmon_energy_get(hwmon, channel, &energy);
+
+ /* Initialize 'struct xe_hwmon_fan_info' with initial fan register reading. */
+ for (channel = 0; channel < FAN_MAX; channel++)
+ if (xe_hwmon_is_visible(hwmon, hwmon_fan, hwmon_fan_input, channel))
+ xe_hwmon_fan_input_read(hwmon, channel, &fan_speed);
}
static void xe_hwmon_mutex_destroy(void *arg)
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