drm/nouveau/therm: implement support for temperature alarms

For now, we only boost the fan speed to the maximum and auto-mode
when hitting the FAN_BOOST threshold and halt the computer when it
reaches the shutdown temperature. The downclock and critical thresholds
do nothing.

On nv43:50 and nva3+, temperature is polled because of the limited hardware.
I'll improve the nva3+ situation by implementing alarm management in PDAEMON
whenever I can but polling once every second shouldn't be such a problem.

v2 (Ben Skeggs):
- rebased

v3: fixed false-detections and threshold reprogrammation handling on nv50:nvc0

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Martin Peres <martin.peres@labri.fr>

9 files changed, 366 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/core/os.h b/drivers/gpu/drm/nouveau/core/os.h
index cfe3b9cad156..eb496033b55c 100644
--- a/drivers/gpu/drm/nouveau/core/os.h
+++ b/drivers/gpu/drm/nouveau/core/os.h
@@ -16,6 +16,7 @@
 #include <linux/vmalloc.h>
 #include <linux/acpi.h>
 #include <linux/dmi.h>
+#include <linux/reboot.h>
 
 #include <asm/unaligned.h>
 
diff --git a/drivers/gpu/drm/nouveau/core/subdev/mc/nv98.c b/drivers/gpu/drm/nouveau/core/subdev/mc/nv98.c
index b93fd094c806..3a80b29dce0f 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/mc/nv98.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/mc/nv98.c
@@ -35,6 +35,7 @@ nv98_mc_intr[] = {
         { 0x00001000, NVDEV_ENGINE_GR },
         { 0x00004000, NVDEV_ENGINE_CRYPT },     /* NV84:NVA3 */
         { 0x00008000, NVDEV_ENGINE_BSP },
+        { 0x00080000, NVDEV_SUBDEV_THERM },     /* NVA3:NVC0 */
         { 0x00100000, NVDEV_SUBDEV_TIMER },
         { 0x00200000, NVDEV_SUBDEV_GPIO },
         { 0x00400000, NVDEV_ENGINE_COPY0 },     /* NVA3-     */
diff --git a/drivers/gpu/drm/nouveau/core/subdev/therm/base.c b/drivers/gpu/drm/nouveau/core/subdev/therm/base.c
index dee764c7b693..f54495a0907a 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/therm/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/therm/base.c
@@ -123,7 +123,7 @@ nouveau_therm_alarm(struct nouveau_alarm *alarm)
         nouveau_therm_update(&priv->base, -1);
 }
 
-static int
+int
 nouveau_therm_mode(struct nouveau_therm *therm, int mode)
 {
         struct nouveau_therm_priv *priv = (void *)therm;
@@ -212,27 +212,35 @@ nouveau_therm_attr_set(struct nouveau_therm *therm,
                 return nouveau_therm_mode(therm, value);
         case NOUVEAU_THERM_ATTR_THRS_FAN_BOOST:
                 priv->bios_sensor.thrs_fan_boost.temp = value;
+                priv->sensor.program_alarms(therm);
                 return 0;
         case NOUVEAU_THERM_ATTR_THRS_FAN_BOOST_HYST:
                 priv->bios_sensor.thrs_fan_boost.hysteresis = value;
+                priv->sensor.program_alarms(therm);
                 return 0;
         case NOUVEAU_THERM_ATTR_THRS_DOWN_CLK:
                 priv->bios_sensor.thrs_down_clock.temp = value;
+                priv->sensor.program_alarms(therm);
                 return 0;
         case NOUVEAU_THERM_ATTR_THRS_DOWN_CLK_HYST:
                 priv->bios_sensor.thrs_down_clock.hysteresis = value;
+                priv->sensor.program_alarms(therm);
                 return 0;
         case NOUVEAU_THERM_ATTR_THRS_CRITICAL:
                 priv->bios_sensor.thrs_critical.temp = value;
+                priv->sensor.program_alarms(therm);
                 return 0;
         case NOUVEAU_THERM_ATTR_THRS_CRITICAL_HYST:
                 priv->bios_sensor.thrs_critical.hysteresis = value;
+                priv->sensor.program_alarms(therm);
                 return 0;
         case NOUVEAU_THERM_ATTR_THRS_SHUTDOWN:
                 priv->bios_sensor.thrs_shutdown.temp = value;
+                priv->sensor.program_alarms(therm);
                 return 0;
         case NOUVEAU_THERM_ATTR_THRS_SHUTDOWN_HYST:
                 priv->bios_sensor.thrs_shutdown.hysteresis = value;
+                priv->sensor.program_alarms(therm);
                 return 0;
         }
 
@@ -253,6 +261,7 @@ _nouveau_therm_init(struct nouveau_object *object)
         if (priv->fan->percent >= 0)
                 therm->fan_set(therm, priv->fan->percent);
 
+        priv->sensor.program_alarms(therm);
         return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/subdev/therm/nv40.c b/drivers/gpu/drm/nouveau/core/subdev/therm/nv40.c
index 3f7c11500598..5c17577553f6 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/therm/nv40.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/therm/nv40.c
@@ -38,6 +38,7 @@ nv40_sensor_setup(struct nouveau_therm *therm)
         if (device->chipset >= 0x46) {
                 nv_mask(therm, 0x15b8, 0x80000000, 0);
                 nv_wr32(therm, 0x15b0, 0x80003fff);
+                mdelay(10); /* wait for the temperature to stabilize */
                 return nv_rd32(therm, 0x15b4) & 0x3fff;
         } else {
                 nv_wr32(therm, 0x15b0, 0xff);
@@ -135,6 +136,20 @@ nv40_fan_pwm_set(struct nouveau_therm *therm, int line, u32 divs, u32 duty)
         return 0;
 }
 
+static void
+nv40_therm_intr(struct nouveau_subdev *subdev)
+{
+        struct nouveau_therm *therm = nouveau_therm(subdev);
+        uint32_t stat = nv_rd32(therm, 0x1100);
+
+        /* traitement */
+
+        /* ack all IRQs */
+        nv_wr32(therm, 0x1100, 0x70000);
+
+        nv_error(therm, "THERM received an IRQ: stat = %x\n", stat);
+}
+
 static int
 nv40_therm_ctor(struct nouveau_object *parent,
                 struct nouveau_object *engine,
@@ -153,6 +168,8 @@ nv40_therm_ctor(struct nouveau_object *parent,
         priv->base.base.pwm_get = nv40_fan_pwm_get;
         priv->base.base.pwm_set = nv40_fan_pwm_set;
         priv->base.base.temp_get = nv40_temp_get;
+        priv->base.sensor.program_alarms = nouveau_therm_program_alarms_polling;
+        nv_subdev(priv)->intr = nv40_therm_intr;
         return nouveau_therm_preinit(&priv->base.base);
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/subdev/therm/nv50.c b/drivers/gpu/drm/nouveau/core/subdev/therm/nv50.c
index 8bb4c2a15efa..4b7fe24f5506 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/therm/nv50.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/therm/nv50.c
@@ -124,6 +124,141 @@ nv50_temp_get(struct nouveau_therm *therm)
         return nv_rd32(therm, 0x20400);
 }
 
+static void
+nv50_therm_program_alarms(struct nouveau_therm *therm)
+{
+        struct nouveau_therm_priv *priv = (void *)therm;
+        struct nvbios_therm_sensor *sensor = &priv->bios_sensor;
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->sensor.alarm_program_lock, flags);
+
+        /* enable RISING and FALLING IRQs for shutdown, THRS 0, 1, 2 and 4 */
+        nv_wr32(therm, 0x20000, 0x000003ff);
+
+        /* shutdown: The computer should be shutdown when reached */
+        nv_wr32(therm, 0x20484, sensor->thrs_shutdown.hysteresis);
+        nv_wr32(therm, 0x20480, sensor->thrs_shutdown.temp);
+
+        /* THRS_1 : fan boost*/
+        nv_wr32(therm, 0x204c4, sensor->thrs_fan_boost.temp);
+
+        /* THRS_2 : critical */
+        nv_wr32(therm, 0x204c0, sensor->thrs_critical.temp);
+
+        /* THRS_4 : down clock */
+        nv_wr32(therm, 0x20414, sensor->thrs_down_clock.temp);
+        spin_unlock_irqrestore(&priv->sensor.alarm_program_lock, flags);
+
+        nv_info(therm,
+                "Programmed thresholds [ %d(%d), %d(%d), %d(%d), %d(%d) ]\n",
+                sensor->thrs_fan_boost.temp, sensor->thrs_fan_boost.hysteresis,
+                sensor->thrs_down_clock.temp,
+                sensor->thrs_down_clock.hysteresis,
+                sensor->thrs_critical.temp, sensor->thrs_critical.hysteresis,
+                sensor->thrs_shutdown.temp, sensor->thrs_shutdown.hysteresis);
+
+}
+
+/* must be called with alarm_program_lock taken ! */
+static void
+nv50_therm_threshold_hyst_emulation(struct nouveau_therm *therm,
+                                   uint32_t thrs_reg, u8 status_bit,
+                                   const struct nvbios_therm_threshold *thrs,
+                                   enum nouveau_therm_thrs thrs_name)
+{
+        enum nouveau_therm_thrs_direction direction;
+        enum nouveau_therm_thrs_state prev_state, new_state;
+        int temp, cur;
+
+        prev_state = nouveau_therm_sensor_get_threshold_state(therm, thrs_name);
+        temp = nv_rd32(therm, thrs_reg);
+
+        /* program the next threshold */
+        if (temp == thrs->temp) {
+                nv_wr32(therm, thrs_reg, thrs->temp - thrs->hysteresis);
+                new_state = NOUVEAU_THERM_THRS_HIGHER;
+        } else {
+                nv_wr32(therm, thrs_reg, thrs->temp);
+                new_state = NOUVEAU_THERM_THRS_LOWER;
+        }
+
+        /* fix the state (in case someone reprogrammed the alarms) */
+        cur = therm->temp_get(therm);
+        if (new_state == NOUVEAU_THERM_THRS_LOWER && cur > thrs->temp)
+                new_state = NOUVEAU_THERM_THRS_HIGHER;
+        else if (new_state == NOUVEAU_THERM_THRS_HIGHER &&
+                cur < thrs->temp - thrs->hysteresis)
+                new_state = NOUVEAU_THERM_THRS_LOWER;
+        nouveau_therm_sensor_set_threshold_state(therm, thrs_name, new_state);
+
+        /* find the direction */
+        if (prev_state < new_state)
+                direction = NOUVEAU_THERM_THRS_RISING;
+        else if (prev_state > new_state)
+                direction = NOUVEAU_THERM_THRS_FALLING;
+        else
+                return;
+
+        /* advertise a change in direction */
+        nouveau_therm_sensor_event(therm, thrs_name, direction);
+}
+
+static void
+nv50_therm_intr(struct nouveau_subdev *subdev)
+{
+        struct nouveau_therm *therm = nouveau_therm(subdev);
+        struct nouveau_therm_priv *priv = (void *)therm;
+        struct nvbios_therm_sensor *sensor = &priv->bios_sensor;
+        unsigned long flags;
+        uint32_t intr;
+
+        spin_lock_irqsave(&priv->sensor.alarm_program_lock, flags);
+
+        intr = nv_rd32(therm, 0x20100);
+
+        /* THRS_4: downclock */
+        if (intr & 0x002) {
+                nv50_therm_threshold_hyst_emulation(therm, 0x20414, 24,
+                                                  &sensor->thrs_down_clock,
+                                                  NOUVEAU_THERM_THRS_DOWNCLOCK);
+                intr &= ~0x002;
+        }
+
+        /* shutdown */
+        if (intr & 0x004) {
+                nv50_therm_threshold_hyst_emulation(therm, 0x20480, 20,
+                                                   &sensor->thrs_shutdown,
+                                                   NOUVEAU_THERM_THRS_SHUTDOWN);
+                intr &= ~0x004;
+        }
+
+        /* THRS_1 : fan boost */
+        if (intr & 0x008) {
+                nv50_therm_threshold_hyst_emulation(therm, 0x204c4, 21,
+                                                   &sensor->thrs_fan_boost,
+                                                   NOUVEAU_THERM_THRS_FANBOOST);
+                intr &= ~0x008;
+        }
+
+        /* THRS_2 : critical */
+        if (intr & 0x010) {
+                nv50_therm_threshold_hyst_emulation(therm, 0x204c0, 22,
+                                                   &sensor->thrs_critical,
+                                                   NOUVEAU_THERM_THRS_CRITICAL);
+                intr &= ~0x010;
+        }
+
+        if (intr)
+                nv_error(therm, "unhandled intr 0x%08x\n", intr);
+
+        /* ACK everything */
+        nv_wr32(therm, 0x20100, 0xffffffff);
+        nv_wr32(therm, 0x1100, 0x10000); /* PBUS */
+
+        spin_unlock_irqrestore(&priv->sensor.alarm_program_lock, flags);
+}
+
 static int
 nv50_therm_ctor(struct nouveau_object *parent,
                 struct nouveau_object *engine,
@@ -143,6 +278,24 @@ nv50_therm_ctor(struct nouveau_object *parent,
         priv->base.base.pwm_set = nv50_fan_pwm_set;
         priv->base.base.pwm_clock = nv50_fan_pwm_clock;
         priv->base.base.temp_get = nv50_temp_get;
+        priv->base.sensor.program_alarms = nv50_therm_program_alarms;
+        spin_lock_init(&priv->base.sensor.alarm_program_lock);
+        nv_subdev(priv)->intr = nv50_therm_intr;
+
+        /* init the thresholds */
+        nouveau_therm_sensor_set_threshold_state(&priv->base.base,
+                                                 NOUVEAU_THERM_THRS_SHUTDOWN,
+                                                 NOUVEAU_THERM_THRS_LOWER);
+        nouveau_therm_sensor_set_threshold_state(&priv->base.base,
+                                                 NOUVEAU_THERM_THRS_FANBOOST,
+                                                 NOUVEAU_THERM_THRS_LOWER);
+        nouveau_therm_sensor_set_threshold_state(&priv->base.base,
+                                                 NOUVEAU_THERM_THRS_CRITICAL,
+                                                 NOUVEAU_THERM_THRS_LOWER);
+        nouveau_therm_sensor_set_threshold_state(&priv->base.base,
+                                                 NOUVEAU_THERM_THRS_DOWNCLOCK,
+                                                 NOUVEAU_THERM_THRS_LOWER);
+
         return nouveau_therm_preinit(&priv->base.base);
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/subdev/therm/nva3.c b/drivers/gpu/drm/nouveau/core/subdev/therm/nva3.c
index 8625d219f5ca..2dcc5437116a 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/therm/nva3.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/therm/nva3.c
@@ -83,6 +83,7 @@ nva3_therm_ctor(struct nouveau_object *parent,
         priv->base.base.pwm_clock = nv50_fan_pwm_clock;
         priv->base.base.temp_get = nv50_temp_get;
         priv->base.base.fan_sense = nva3_therm_fan_sense;
+        priv->base.sensor.program_alarms = nouveau_therm_program_alarms_polling;
         return nouveau_therm_preinit(&priv->base.base);
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/subdev/therm/nvd0.c b/drivers/gpu/drm/nouveau/core/subdev/therm/nvd0.c
index e722dcd4e37b..d7d30ee8332e 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/therm/nvd0.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/therm/nvd0.c
@@ -137,6 +137,7 @@ nvd0_therm_ctor(struct nouveau_object *parent,
         priv->base.base.pwm_clock = nvd0_fan_pwm_clock;
         priv->base.base.temp_get = nv50_temp_get;
         priv->base.base.fan_sense = nva3_therm_fan_sense;
+        priv->base.sensor.program_alarms = nouveau_therm_program_alarms_polling;
         return nouveau_therm_preinit(&priv->base.base);
 }
 
diff --git a/drivers/gpu/drm/nouveau/core/subdev/therm/priv.h b/drivers/gpu/drm/nouveau/core/subdev/therm/priv.h
index 5c628b5832e6..c2413e6aae25 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/therm/priv.h
+++ b/drivers/gpu/drm/nouveau/core/subdev/therm/priv.h
@@ -50,6 +50,24 @@ struct nouveau_fan {
         struct dcb_gpio_func tach;
 };
 
+enum nouveau_therm_thrs_direction {
+        NOUVEAU_THERM_THRS_FALLING = 0,
+        NOUVEAU_THERM_THRS_RISING = 1
+};
+
+enum nouveau_therm_thrs_state {
+        NOUVEAU_THERM_THRS_LOWER = 0,
+        NOUVEAU_THERM_THRS_HIGHER = 1
+};
+
+enum nouveau_therm_thrs {
+        NOUVEAU_THERM_THRS_FANBOOST = 0,
+        NOUVEAU_THERM_THRS_DOWNCLOCK = 1,
+        NOUVEAU_THERM_THRS_CRITICAL = 2,
+        NOUVEAU_THERM_THRS_SHUTDOWN = 3,
+        NOUVEAU_THERM_THRS_NR
+};
+
 struct nouveau_therm_priv {
         struct nouveau_therm base;
 
@@ -65,10 +83,25 @@ struct nouveau_therm_priv {
         /* fan priv */
         struct nouveau_fan *fan;
 
+        /* alarms priv */
+        struct {
+                spinlock_t alarm_program_lock;
+                struct nouveau_alarm therm_poll_alarm;
+                enum nouveau_therm_thrs_state alarm_state[NOUVEAU_THERM_THRS_NR];
+                void (*program_alarms)(struct nouveau_therm *);
+        } sensor;
+
+        /* what should be done if the card overheats */
+        struct {
+                void (*downclock)(struct nouveau_therm *, bool active);
+                void (*pause)(struct nouveau_therm *, bool active);
+        } emergency;
+
         /* ic */
         struct i2c_client *ic;
 };
 
+int nouveau_therm_mode(struct nouveau_therm *therm, int mode);
 int nouveau_therm_attr_get(struct nouveau_therm *therm,
                        enum nouveau_therm_attr_type type);
 int nouveau_therm_attr_set(struct nouveau_therm *therm,
@@ -88,6 +121,17 @@ int nouveau_therm_fan_sense(struct nouveau_therm *therm);
 
 int nouveau_therm_preinit(struct nouveau_therm *);
 
+void nouveau_therm_sensor_set_threshold_state(struct nouveau_therm *therm,
+                                             enum nouveau_therm_thrs thrs,
+                                             enum nouveau_therm_thrs_state st);
+enum nouveau_therm_thrs_state
+nouveau_therm_sensor_get_threshold_state(struct nouveau_therm *therm,
+                                         enum nouveau_therm_thrs thrs);
+void nouveau_therm_sensor_event(struct nouveau_therm *therm,
+                                enum nouveau_therm_thrs thrs,
+                                enum nouveau_therm_thrs_direction dir);
+void nouveau_therm_program_alarms_polling(struct nouveau_therm *therm);
+
 int nv50_fan_pwm_ctrl(struct nouveau_therm *, int, bool);
 int nv50_fan_pwm_get(struct nouveau_therm *, int, u32 *, u32 *);
 int nv50_fan_pwm_set(struct nouveau_therm *, int, u32, u32);
diff --git a/drivers/gpu/drm/nouveau/core/subdev/therm/temp.c b/drivers/gpu/drm/nouveau/core/subdev/therm/temp.c
index 204282301fb1..d80c572de04f 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/therm/temp.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/therm/temp.c
@@ -65,12 +65,150 @@ nouveau_therm_temp_safety_checks(struct nouveau_therm *therm)
                 priv->bios_sensor.offset_den = 1;
 }
 
+/* must be called with alarm_program_lock taken ! */
+void nouveau_therm_sensor_set_threshold_state(struct nouveau_therm *therm,
+                                             enum nouveau_therm_thrs thrs,
+                                             enum nouveau_therm_thrs_state st)
+{
+        struct nouveau_therm_priv *priv = (void *)therm;
+        priv->sensor.alarm_state[thrs] = st;
+}
+
+/* must be called with alarm_program_lock taken ! */
+enum nouveau_therm_thrs_state
+nouveau_therm_sensor_get_threshold_state(struct nouveau_therm *therm,
+                                         enum nouveau_therm_thrs thrs)
+{
+        struct nouveau_therm_priv *priv = (void *)therm;
+        return priv->sensor.alarm_state[thrs];
+}
+
+void nouveau_therm_sensor_event(struct nouveau_therm *therm,
+                                enum nouveau_therm_thrs thrs,
+                                enum nouveau_therm_thrs_direction dir)
+{
+        struct nouveau_therm_priv *priv = (void *)therm;
+        bool active;
+        const char *thresolds[] = {
+                "fanboost", "downclock", "critical", "shutdown"
+        };
+        uint8_t temperature = therm->temp_get(therm);
+
+        if (thrs < 0 || thrs > 3)
+                return;
+
+        if (dir == NOUVEAU_THERM_THRS_FALLING)
+                nv_info(therm, "temperature (%u C) went bellow the '%s' threshold\n",
+                        temperature, thresolds[thrs]);
+        else
+                nv_info(therm, "temperature (%u C) hit the '%s' threshold\n",
+                        temperature, thresolds[thrs]);
+
+        active = (dir == NOUVEAU_THERM_THRS_RISING);
+        switch (thrs) {
+        case NOUVEAU_THERM_THRS_FANBOOST:
+                nouveau_therm_fan_set(therm, true, 100);
+                nouveau_therm_mode(therm, FAN_CONTROL_AUTO);
+                break;
+        case NOUVEAU_THERM_THRS_DOWNCLOCK:
+                if (priv->emergency.downclock)
+                        priv->emergency.downclock(therm, active);
+                break;
+        case NOUVEAU_THERM_THRS_CRITICAL:
+                if (priv->emergency.pause)
+                        priv->emergency.pause(therm, active);
+                break;
+        case NOUVEAU_THERM_THRS_SHUTDOWN:
+                orderly_poweroff(true);
+                break;
+        case NOUVEAU_THERM_THRS_NR:
+                break;
+        }
+
+}
+
+/* must be called with alarm_program_lock taken ! */
+static void
+nouveau_therm_threshold_hyst_polling(struct nouveau_therm *therm,
+                                   const struct nvbios_therm_threshold *thrs,
+                                   enum nouveau_therm_thrs thrs_name)
+{
+        enum nouveau_therm_thrs_direction direction;
+        enum nouveau_therm_thrs_state prev_state, new_state;
+        int temp = therm->temp_get(therm);
+
+        prev_state = nouveau_therm_sensor_get_threshold_state(therm, thrs_name);
+
+        if (temp >= thrs->temp && prev_state == NOUVEAU_THERM_THRS_LOWER) {
+                direction = NOUVEAU_THERM_THRS_RISING;
+                new_state = NOUVEAU_THERM_THRS_HIGHER;
+        } else if (temp <= thrs->temp - thrs->hysteresis &&
+                        prev_state == NOUVEAU_THERM_THRS_HIGHER) {
+                direction = NOUVEAU_THERM_THRS_FALLING;
+                new_state = NOUVEAU_THERM_THRS_LOWER;
+        } else
+                return; /* nothing to do */
+
+        nouveau_therm_sensor_set_threshold_state(therm, thrs_name, new_state);
+        nouveau_therm_sensor_event(therm, thrs_name, direction);
+}
+
+static void
+alarm_timer_callback(struct nouveau_alarm *alarm)
+{
+        struct nouveau_therm_priv *priv =
+        container_of(alarm, struct nouveau_therm_priv, sensor.therm_poll_alarm);
+        struct nvbios_therm_sensor *sensor = &priv->bios_sensor;
+        struct nouveau_timer *ptimer = nouveau_timer(priv);
+        struct nouveau_therm *therm = &priv->base;
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->sensor.alarm_program_lock, flags);
+
+        nouveau_therm_threshold_hyst_polling(therm, &sensor->thrs_fan_boost,
+                                             NOUVEAU_THERM_THRS_FANBOOST);
+
+        nouveau_therm_threshold_hyst_polling(therm, &sensor->thrs_down_clock,
+                                             NOUVEAU_THERM_THRS_DOWNCLOCK);
+
+        nouveau_therm_threshold_hyst_polling(therm, &sensor->thrs_critical,
+                                             NOUVEAU_THERM_THRS_CRITICAL);
+
+        nouveau_therm_threshold_hyst_polling(therm, &sensor->thrs_shutdown,
+                                             NOUVEAU_THERM_THRS_SHUTDOWN);
+
+        /* schedule the next poll in one second */
+        if (list_empty(&alarm->head))
+                ptimer->alarm(ptimer, 1000 * 1000 * 1000, alarm);
+
+        spin_unlock_irqrestore(&priv->sensor.alarm_program_lock, flags);
+}
+
+void
+nouveau_therm_program_alarms_polling(struct nouveau_therm *therm)
+{
+        struct nouveau_therm_priv *priv = (void *)therm;
+        struct nvbios_therm_sensor *sensor = &priv->bios_sensor;
+
+        nv_info(therm,
+                "programmed thresholds [ %d(%d), %d(%d), %d(%d), %d(%d) ]\n",
+                sensor->thrs_fan_boost.temp, sensor->thrs_fan_boost.hysteresis,
+                sensor->thrs_down_clock.temp,
+                sensor->thrs_down_clock.hysteresis,
+                sensor->thrs_critical.temp, sensor->thrs_critical.hysteresis,
+                sensor->thrs_shutdown.temp, sensor->thrs_shutdown.hysteresis);
+
+        alarm_timer_callback(&priv->sensor.therm_poll_alarm);
+}
+
 int
 nouveau_therm_sensor_ctor(struct nouveau_therm *therm)
 {
         struct nouveau_therm_priv *priv = (void *)therm;
         struct nouveau_bios *bios = nouveau_bios(therm);
 
+        nouveau_alarm_init(&priv->sensor.therm_poll_alarm, alarm_timer_callback);
+
         nouveau_therm_temp_set_defaults(therm);
         if (nvbios_therm_sensor_parse(bios, NVBIOS_THERM_DOMAIN_CORE,
                                       &priv->bios_sensor))