#define HPD_STORM_REENABLE_DELAY (2 * 60 * 1000)
/**
- * intel_hpd_irq_storm_detect - gather stats and detect HPD irq storm on a pin
+ * intel_hpd_irq_storm_detect - gather stats and detect HPD IRQ storm on a pin
* @dev_priv: private driver data pointer
* @pin: the pin to gather stats on
+ * @long_hpd: whether the HPD IRQ was long or short
*
- * Gather stats about HPD irqs from the specified @pin, and detect irq
+ * Gather stats about HPD IRQs from the specified @pin, and detect IRQ
* storms. Only the pin specific stats and state are changed, the caller is
* responsible for further action.
*
- * The number of irqs that are allowed within @HPD_STORM_DETECT_PERIOD is
+ * The number of IRQs that are allowed within @HPD_STORM_DETECT_PERIOD is
* stored in @dev_priv->hotplug.hpd_storm_threshold which defaults to
- * @HPD_STORM_DEFAULT_THRESHOLD. If this threshold is exceeded, it's
- * considered an irq storm and the irq state is set to @HPD_MARK_DISABLED.
+ * @HPD_STORM_DEFAULT_THRESHOLD. Long IRQs count as +10 to this threshold, and
+ * short IRQs count as +1. If this threshold is exceeded, it's considered an
+ * IRQ storm and the IRQ state is set to @HPD_MARK_DISABLED.
+ *
+ * By default, most systems will only count long IRQs towards
+ * &dev_priv->hotplug.hpd_storm_threshold. However, some older systems also
+ * suffer from short IRQ storms and must also track these. Because short IRQ
+ * storms are naturally caused by sideband interactions with DP MST devices,
+ * short IRQ detection is only enabled for systems without DP MST support.
+ * Systems which are new enough to support DP MST are far less likely to
+ * suffer from IRQ storms at all, so this is fine.
*
* The HPD threshold can be controlled through i915_hpd_storm_ctl in debugfs,
* and should only be adjusted for automated hotplug testing.
*
- * Return true if an irq storm was detected on @pin.
+ * Return true if an IRQ storm was detected on @pin.
*/
static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv,
- enum hpd_pin pin)
+ enum hpd_pin pin, bool long_hpd)
{
- unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies;
+ struct i915_hotplug *hpd = &dev_priv->hotplug;
+ unsigned long start = hpd->stats[pin].last_jiffies;
unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
- const int threshold = dev_priv->hotplug.hpd_storm_threshold;
+ const int increment = long_hpd ? 10 : 1;
+ const int threshold = hpd->hpd_storm_threshold;
bool storm = false;
+ if (!threshold ||
+ (!long_hpd && !dev_priv->hotplug.hpd_short_storm_enabled))
+ return false;
+
if (!time_in_range(jiffies, start, end)) {
- dev_priv->hotplug.stats[pin].last_jiffies = jiffies;
- dev_priv->hotplug.stats[pin].count = 0;
- DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", pin);
- } else if (dev_priv->hotplug.stats[pin].count > threshold &&
- threshold) {
- dev_priv->hotplug.stats[pin].state = HPD_MARK_DISABLED;
+ hpd->stats[pin].last_jiffies = jiffies;
+ hpd->stats[pin].count = 0;
+ }
+
+ hpd->stats[pin].count += increment;
+ if (hpd->stats[pin].count > threshold) {
+ hpd->stats[pin].state = HPD_MARK_DISABLED;
DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", pin);
storm = true;
} else {
- dev_priv->hotplug.stats[pin].count++;
DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", pin,
- dev_priv->hotplug.stats[pin].count);
+ hpd->stats[pin].count);
}
return storm;
}
-static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv)
+static void
+intel_hpd_irq_storm_switch_to_polling(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = &dev_priv->drm;
struct intel_connector *intel_connector;
drm_for_each_connector_iter(connector, &conn_iter) {
struct intel_connector *intel_connector = to_intel_connector(connector);
- if (intel_connector->encoder->hpd_pin == pin) {
+ /* Don't check MST ports, they don't have pins */
+ if (!intel_connector->mst_port &&
+ intel_connector->encoder->hpd_pin == pin) {
if (connector->polled != intel_connector->polled)
DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
connector->name);
hpd_event_bits = dev_priv->hotplug.event_bits;
dev_priv->hotplug.event_bits = 0;
- /* Disable hotplug on connectors that hit an irq storm. */
- intel_hpd_irq_storm_disable(dev_priv);
+ /* Enable polling for connectors which had HPD IRQ storms */
+ intel_hpd_irq_storm_switch_to_polling(dev_priv);
spin_unlock_irq(&dev_priv->irq_lock);
struct intel_encoder *encoder;
bool storm_detected = false;
bool queue_dig = false, queue_hp = false;
+ u32 long_hpd_pulse_mask = 0;
+ u32 short_hpd_pulse_mask = 0;
+ enum hpd_pin pin;
if (!pin_mask)
return;
spin_lock(&dev_priv->irq_lock);
+
+ /*
+ * Determine whether ->hpd_pulse() exists for each pin, and
+ * whether we have a short or a long pulse. This is needed
+ * as each pin may have up to two encoders (HDMI and DP) and
+ * only the one of them (DP) will have ->hpd_pulse().
+ */
for_each_intel_encoder(&dev_priv->drm, encoder) {
- enum hpd_pin pin = encoder->hpd_pin;
bool has_hpd_pulse = intel_encoder_has_hpd_pulse(encoder);
+ enum port port = encoder->port;
+ bool long_hpd;
+ pin = encoder->hpd_pin;
if (!(BIT(pin) & pin_mask))
continue;
- if (has_hpd_pulse) {
- bool long_hpd = long_mask & BIT(pin);
- enum port port = encoder->port;
+ if (!has_hpd_pulse)
+ continue;
- DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", port_name(port),
- long_hpd ? "long" : "short");
- /*
- * For long HPD pulses we want to have the digital queue happen,
- * but we still want HPD storm detection to function.
- */
- queue_dig = true;
- if (long_hpd) {
- dev_priv->hotplug.long_port_mask |= (1 << port);
- } else {
- /* for short HPD just trigger the digital queue */
- dev_priv->hotplug.short_port_mask |= (1 << port);
- continue;
- }
+ long_hpd = long_mask & BIT(pin);
+
+ DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", port_name(port),
+ long_hpd ? "long" : "short");
+ queue_dig = true;
+
+ if (long_hpd) {
+ long_hpd_pulse_mask |= BIT(pin);
+ dev_priv->hotplug.long_port_mask |= BIT(port);
+ } else {
+ short_hpd_pulse_mask |= BIT(pin);
+ dev_priv->hotplug.short_port_mask |= BIT(port);
}
+ }
+
+ /* Now process each pin just once */
+ for_each_hpd_pin(pin) {
+ bool long_hpd;
+
+ if (!(BIT(pin) & pin_mask))
+ continue;
if (dev_priv->hotplug.stats[pin].state == HPD_DISABLED) {
/*
if (dev_priv->hotplug.stats[pin].state != HPD_ENABLED)
continue;
- if (!has_hpd_pulse) {
+ /*
+ * Delegate to ->hpd_pulse() if one of the encoders for this
+ * pin has it, otherwise let the hotplug_work deal with this
+ * pin directly.
+ */
+ if (((short_hpd_pulse_mask | long_hpd_pulse_mask) & BIT(pin))) {
+ long_hpd = long_hpd_pulse_mask & BIT(pin);
+ } else {
dev_priv->hotplug.event_bits |= BIT(pin);
+ long_hpd = true;
queue_hp = true;
}
- if (intel_hpd_irq_storm_detect(dev_priv, pin)) {
+ if (intel_hpd_irq_storm_detect(dev_priv, pin, long_hpd)) {
dev_priv->hotplug.event_bits &= ~BIT(pin);
storm_detected = true;
+ queue_hp = true;
}
}
+ /*
+ * Disable any IRQs that storms were detected on. Polling enablement
+ * happens later in our hotplug work.
+ */
if (storm_detected && dev_priv->display_irqs_enabled)
dev_priv->display.hpd_irq_setup(dev_priv);
spin_unlock(&dev_priv->irq_lock);
projects / linux-2.6-block.git / blobdiff