drivers/net/wireless/intel/iwlwifi/dvm/tt.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/intel/iwlwifi/dvm/tt.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/intel/iwlwifi/dvm/tt.c
Extension
.c
Size
20961 bytes
Lines
655
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (priv->thermal_throttle.ct_kill_toggle) {
			iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR,
				    CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
			priv->thermal_throttle.ct_kill_toggle = false;
		} else {
			iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET,
				    CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
			priv->thermal_throttle.ct_kill_toggle = true;
		}
		iwl_read32(priv->trans, CSR_UCODE_DRV_GP1);
		if (iwl_trans_grab_nic_access(priv->trans))
			iwl_trans_release_nic_access(priv->trans);

		/* Reschedule the ct_kill timer to occur in
		 * CT_KILL_EXIT_DURATION seconds to ensure we get a
		 * thermal update */
		IWL_DEBUG_TEMP(priv, "schedule ct_kill exit timer\n");
		mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
			  jiffies + CT_KILL_EXIT_DURATION * HZ);
	}
}

static void iwl_perform_ct_kill_task(struct iwl_priv *priv,
			   bool stop)
{
	if (stop) {
		IWL_DEBUG_TEMP(priv, "Stop all queues\n");
		if (priv->mac80211_registered)
			ieee80211_stop_queues(priv->hw);
		IWL_DEBUG_TEMP(priv,
				"Schedule 5 seconds CT_KILL Timer\n");
		mod_timer(&priv->thermal_throttle.ct_kill_exit_tm,
			  jiffies + CT_KILL_EXIT_DURATION * HZ);
	} else {
		IWL_DEBUG_TEMP(priv, "Wake all queues\n");
		if (priv->mac80211_registered)
			ieee80211_wake_queues(priv->hw);
	}
}

static void iwl_tt_ready_for_ct_kill(struct timer_list *t)
{
	struct iwl_priv *priv = timer_container_of(priv, t,
						   thermal_throttle.ct_kill_waiting_tm);
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;

	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
		return;

	/* temperature timer expired, ready to go into CT_KILL state */
	if (tt->state != IWL_TI_CT_KILL) {
		IWL_DEBUG_TEMP(priv, "entering CT_KILL state when "
				"temperature timer expired\n");
		tt->state = IWL_TI_CT_KILL;
		set_bit(STATUS_CT_KILL, &priv->status);
		iwl_perform_ct_kill_task(priv, true);
	}
}

static void iwl_prepare_ct_kill_task(struct iwl_priv *priv)
{
	IWL_DEBUG_TEMP(priv, "Prepare to enter IWL_TI_CT_KILL\n");
	/* make request to retrieve statistics information */
	iwl_send_statistics_request(priv, 0, false);
	/* Reschedule the ct_kill wait timer */
	mod_timer(&priv->thermal_throttle.ct_kill_waiting_tm,
		 jiffies + msecs_to_jiffies(CT_KILL_WAITING_DURATION));
}

#define IWL_MINIMAL_POWER_THRESHOLD		(CT_KILL_THRESHOLD_LEGACY)
#define IWL_REDUCED_PERFORMANCE_THRESHOLD_2	(100)
#define IWL_REDUCED_PERFORMANCE_THRESHOLD_1	(90)

/*
 * Legacy thermal throttling
 * 1) Avoid NIC destruction due to high temperatures
 *	Chip will identify dangerously high temperatures that can
 *	harm the device and will power down
 * 2) Avoid the NIC power down due to high temperature
 *	Throttle early enough to lower the power consumption before
 *	drastic steps are needed
 */
static void iwl_legacy_tt_handler(struct iwl_priv *priv, s32 temp, bool force)
{
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
	enum iwl_tt_state old_state;

#ifdef CONFIG_IWLWIFI_DEBUG
	if ((tt->tt_previous_temp) &&
	    (temp > tt->tt_previous_temp) &&

Annotation

Implementation Notes