[PATCH 0/5] drm/i915: hotplug cleanup saga continues

[PATCH 0/5] drm/i915: hotplug cleanup saga continues

[Jani Nikula]

Some cleanups, but mostly move all platform independent, generic hotplug
code to new intel_hotplug.c.

The expected follow-up would be to document hotplug with a DOC: comment
and add kerneldoc for the most important functions.

BR,
Jani.


Jani Nikula (5):
  drm/i915/irq: move hotplug even debug print to second connector loop
  drm/i915/irq: abstract irq storm hotplug disabling
  drm/i915/irq: clarify irq storm related function naming
  drm/i915: move generic hotplug code into new intel_hotplug.c file
  drm/i915: reduce line width in {pch,i9xx}_get_hpd_pins()

 drivers/gpu/drm/i915/Makefile        |   1 +
 drivers/gpu/drm/i915/i915_drv.c      |  15 --
 drivers/gpu/drm/i915/i915_drv.h      |   9 +-
 drivers/gpu/drm/i915/i915_irq.c      | 413 ++------------------------------
 drivers/gpu/drm/i915/intel_hotplug.c | 452 +++++++++++++++++++++++++++++++++++
 5 files changed, 480 insertions(+), 410 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/intel_hotplug.c

-- 
2.1.4

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[PATCH 1/5] drm/i915/irq: move hotplug even debug print to second connector loop

[Jani Nikula]

The hotplug work function has two loops iterating over connectors, the
first for handling hotplug disabling due to irq storms and the second
for actually handling the hotplug events. Move the debug printing into
the second one, so we can abstract the storm handling better. This may
change the output ordering slightly when there are multiple simultaneous
hotplug events.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 56db9e747464..d64d6895a2e5 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -917,10 +917,6 @@ static void i915_hotplug_work_func(struct work_struct *work)
 				| DRM_CONNECTOR_POLL_DISCONNECT;
 			hpd_disabled = true;
 		}
-		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
-			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
-				      connector->name, intel_encoder->hpd_pin);
-		}
 	}
 	 /* if there were no outputs to poll, poll was disabled,
 	  * therefore make sure it's enabled when disabling HPD on
@@ -939,6 +935,8 @@ static void i915_hotplug_work_func(struct work_struct *work)
 			continue;
 		intel_encoder = intel_connector->encoder;
 		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
+			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
+				      connector->name, intel_encoder->hpd_pin);
 			if (intel_encoder->hot_plug)
 				intel_encoder->hot_plug(intel_encoder);
 			if (intel_hpd_irq_event(dev, connector))
-- 
2.1.4

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[PATCH 2/5] drm/i915/irq: abstract irq storm hotplug disabling

[Jani Nikula]

Continue abstracting hotplug storm related functions to clarify the
code. This time, abstract hotplug irq storm related hotplug
disabling. While at it, clean up the loop iterating over connectors for
readability.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 77 ++++++++++++++++++++++++++---------------
 1 file changed, 50 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index d64d6895a2e5..bf4c15d0ea2b 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -879,7 +879,7 @@ static void i915_digport_work_func(struct work_struct *work)
 /*
  * Handle hotplug events outside the interrupt handler proper.
  */
-#define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
+static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv);
 
 static void i915_hotplug_work_func(struct work_struct *work)
 {
@@ -890,7 +890,6 @@ static void i915_hotplug_work_func(struct work_struct *work)
 	struct intel_connector *intel_connector;
 	struct intel_encoder *intel_encoder;
 	struct drm_connector *connector;
-	bool hpd_disabled = false;
 	bool changed = false;
 	u32 hpd_event_bits;
 
@@ -901,31 +900,9 @@ static void i915_hotplug_work_func(struct work_struct *work)
 
 	hpd_event_bits = dev_priv->hotplug.event_bits;
 	dev_priv->hotplug.event_bits = 0;
-	list_for_each_entry(connector, &mode_config->connector_list, head) {
-		intel_connector = to_intel_connector(connector);
-		if (!intel_connector->encoder)
-			continue;
-		intel_encoder = intel_connector->encoder;
-		if (intel_encoder->hpd_pin > HPD_NONE &&
-		    dev_priv->hotplug.stats[intel_encoder->hpd_pin].state == HPD_MARK_DISABLED &&
-		    connector->polled == DRM_CONNECTOR_POLL_HPD) {
-			DRM_INFO("HPD interrupt storm detected on connector %s: "
-				 "switching from hotplug detection to polling\n",
-				connector->name);
-			dev_priv->hotplug.stats[intel_encoder->hpd_pin].state = HPD_DISABLED;
-			connector->polled = DRM_CONNECTOR_POLL_CONNECT
-				| DRM_CONNECTOR_POLL_DISCONNECT;
-			hpd_disabled = true;
-		}
-	}
-	 /* if there were no outputs to poll, poll was disabled,
-	  * therefore make sure it's enabled when disabling HPD on
-	  * some connectors */
-	if (hpd_disabled) {
-		drm_kms_helper_poll_enable(dev);
-		mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
-				 msecs_to_jiffies(I915_REENABLE_HOTPLUG_DELAY));
-	}
+
+	/* Disable hotplug on connectors that hit an irq storm. */
+	intel_hpd_irq_storm_disable(dev_priv);
 
 	spin_unlock_irq(&dev_priv->irq_lock);
 
@@ -1411,6 +1388,52 @@ static bool intel_hpd_irq_storm(struct drm_i915_private *dev_priv,
 	return storm;
 }
 
+#define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
+
+static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv)
+{
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct intel_connector *intel_connector;
+	struct intel_encoder *intel_encoder;
+	struct drm_connector *connector;
+	enum hpd_pin pin;
+	bool hpd_disabled = false;
+
+	assert_spin_locked(&dev_priv->irq_lock);
+
+	list_for_each_entry(connector, &mode_config->connector_list, head) {
+		if (connector->polled != DRM_CONNECTOR_POLL_HPD)
+			continue;
+
+		intel_connector = to_intel_connector(connector);
+		intel_encoder = intel_connector->encoder;
+		if (!intel_encoder)
+			continue;
+
+		pin = intel_encoder->hpd_pin;
+		if (pin == HPD_NONE ||
+		    dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED)
+			continue;
+
+		DRM_INFO("HPD interrupt storm detected on connector %s: "
+			 "switching from hotplug detection to polling\n",
+			 connector->name);
+
+		dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
+		connector->polled = DRM_CONNECTOR_POLL_CONNECT
+			| DRM_CONNECTOR_POLL_DISCONNECT;
+		hpd_disabled = true;
+	}
+
+	/* Enable polling and queue hotplug re-enabling. */
+	if (hpd_disabled) {
+		drm_kms_helper_poll_enable(dev);
+		mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
+				 msecs_to_jiffies(I915_REENABLE_HOTPLUG_DELAY));
+	}
+}
+
 static bool pch_port_hotplug_long_detect(enum port port, u32 val)
 {
 	switch (port) {
-- 
2.1.4

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[PATCH 3/5] drm/i915/irq: clarify irq storm related function naming

[Jani Nikula]

We'll have three functions:

intel_hpd_irq_storm_detect for detecting irq storms,
intel_hpd_irq_storm_disable for disabling hotplugs after detected storms,
intel_hpd_irq_storm_reenable_work for re-enabling hotplug.

No functional changes.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index bf4c15d0ea2b..ce9eef5f722c 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1350,7 +1350,7 @@ static irqreturn_t gen8_gt_irq_handler(struct drm_i915_private *dev_priv,
 #define HPD_STORM_THRESHOLD 5
 
 /**
- * intel_hpd_irq_storm - 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
  *
@@ -1364,8 +1364,8 @@ static irqreturn_t gen8_gt_irq_handler(struct drm_i915_private *dev_priv,
  *
  * Return true if an irq storm was detected on @pin.
  */
-static bool intel_hpd_irq_storm(struct drm_i915_private *dev_priv,
-				enum hpd_pin pin)
+static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv,
+				       enum hpd_pin pin)
 {
 	unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies;
 	unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
@@ -1603,7 +1603,7 @@ static void intel_hpd_irq_handler(struct drm_device *dev,
 			queue_hp = true;
 		}
 
-		if (intel_hpd_irq_storm(dev_priv, i)) {
+		if (intel_hpd_irq_storm_detect(dev_priv, i)) {
 			dev_priv->hotplug.event_bits &= ~BIT(i);
 			storm_detected = true;
 		}
@@ -4367,7 +4367,7 @@ static void i965_irq_uninstall(struct drm_device * dev)
 	I915_WRITE(IIR, I915_READ(IIR));
 }
 
-static void intel_hpd_irq_reenable_work(struct work_struct *work)
+static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
 {
 	struct drm_i915_private *dev_priv =
 		container_of(work, typeof(*dev_priv),
@@ -4433,7 +4433,7 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 	INIT_DELAYED_WORK(&dev_priv->gpu_error.hangcheck_work,
 			  i915_hangcheck_elapsed);
 	INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
-			  intel_hpd_irq_reenable_work);
+			  intel_hpd_irq_storm_reenable_work);
 
 	pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
 
-- 
2.1.4

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[PATCH 4/5] drm/i915: move generic hotplug code into new intel_hotplug.c file

[Jani Nikula]

We have enough generic hotplug functions sprinkled all over i915_irq.c
to warrant moving them to a file of their own. This should further
underline the distinction between generic code in the new file and
platform specific hotplug and irq code that remains in i915_irq.c.

Add new intel_hpd_init_work to keep work functions static, and rename
get_port_from_pin to intel_hpd_pin_to_port while increasing its
visibility, but keep everything else the same.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/Makefile        |   1 +
 drivers/gpu/drm/i915/i915_drv.c      |  15 --
 drivers/gpu/drm/i915/i915_drv.h      |   9 +-
 drivers/gpu/drm/i915/i915_irq.c      | 409 +------------------------------
 drivers/gpu/drm/i915/intel_hotplug.c | 452 +++++++++++++++++++++++++++++++++++
 5 files changed, 464 insertions(+), 422 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/intel_hotplug.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index b7ddf48e1d75..de2196543367 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -34,6 +34,7 @@ i915-y += i915_cmd_parser.o \
 	  i915_gpu_error.o \
 	  i915_irq.o \
 	  i915_trace_points.o \
+	  intel_hotplug.o \
 	  intel_lrc.o \
 	  intel_ringbuffer.o \
 	  intel_uncore.o
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 78ef0bb53c36..0ec57bad454f 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -541,21 +541,6 @@ bool i915_semaphore_is_enabled(struct drm_device *dev)
 	return true;
 }
 
-void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
-{
-	spin_lock_irq(&dev_priv->irq_lock);
-
-	dev_priv->hotplug.long_port_mask = 0;
-	dev_priv->hotplug.short_port_mask = 0;
-	dev_priv->hotplug.event_bits = 0;
-
-	spin_unlock_irq(&dev_priv->irq_lock);
-
-	cancel_work_sync(&dev_priv->hotplug.dig_port_work);
-	cancel_work_sync(&dev_priv->hotplug.hotplug_work);
-	cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
-}
-
 void i915_firmware_load_error_print(const char *fw_path, int err)
 {
 	DRM_ERROR("failed to load firmware %s (%d)\n", fw_path, err);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 491ef0cfcb0b..b10370e3d0ac 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2600,9 +2600,15 @@ extern unsigned long i915_mch_val(struct drm_i915_private *dev_priv);
 extern unsigned long i915_gfx_val(struct drm_i915_private *dev_priv);
 extern void i915_update_gfx_val(struct drm_i915_private *dev_priv);
 int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool on);
-void intel_hpd_cancel_work(struct drm_i915_private *dev_priv);
 void i915_firmware_load_error_print(const char *fw_path, int err);
 
+/* intel_hotplug.c */
+void intel_hpd_irq_handler(struct drm_device *dev, u32 pin_mask, u32 long_mask);
+void intel_hpd_init(struct drm_i915_private *dev_priv);
+void intel_hpd_init_work(struct drm_i915_private *dev_priv);
+void intel_hpd_cancel_work(struct drm_i915_private *dev_priv);
+enum port intel_hpd_pin_to_port(enum hpd_pin pin);
+
 /* i915_irq.c */
 void i915_queue_hangcheck(struct drm_device *dev);
 __printf(3, 4)
@@ -2610,7 +2616,6 @@ void i915_handle_error(struct drm_device *dev, bool wedged,
 		       const char *fmt, ...);
 
 extern void intel_irq_init(struct drm_i915_private *dev_priv);
-extern void intel_hpd_init(struct drm_i915_private *dev_priv);
 int intel_irq_install(struct drm_i915_private *dev_priv);
 void intel_irq_uninstall(struct drm_i915_private *dev_priv);
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index ce9eef5f722c..2d3b2ccf9ce4 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -807,125 +807,6 @@ static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
 						     &crtc->hwmode);
 }
 
-static bool intel_hpd_irq_event(struct drm_device *dev,
-				struct drm_connector *connector)
-{
-	enum drm_connector_status old_status;
-
-	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
-	old_status = connector->status;
-
-	connector->status = connector->funcs->detect(connector, false);
-	if (old_status == connector->status)
-		return false;
-
-	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
-		      connector->base.id,
-		      connector->name,
-		      drm_get_connector_status_name(old_status),
-		      drm_get_connector_status_name(connector->status));
-
-	return true;
-}
-
-static void i915_digport_work_func(struct work_struct *work)
-{
-	struct drm_i915_private *dev_priv =
-		container_of(work, struct drm_i915_private, hotplug.dig_port_work);
-	u32 long_port_mask, short_port_mask;
-	struct intel_digital_port *intel_dig_port;
-	int i;
-	u32 old_bits = 0;
-
-	spin_lock_irq(&dev_priv->irq_lock);
-	long_port_mask = dev_priv->hotplug.long_port_mask;
-	dev_priv->hotplug.long_port_mask = 0;
-	short_port_mask = dev_priv->hotplug.short_port_mask;
-	dev_priv->hotplug.short_port_mask = 0;
-	spin_unlock_irq(&dev_priv->irq_lock);
-
-	for (i = 0; i < I915_MAX_PORTS; i++) {
-		bool valid = false;
-		bool long_hpd = false;
-		intel_dig_port = dev_priv->hotplug.irq_port[i];
-		if (!intel_dig_port || !intel_dig_port->hpd_pulse)
-			continue;
-
-		if (long_port_mask & (1 << i))  {
-			valid = true;
-			long_hpd = true;
-		} else if (short_port_mask & (1 << i))
-			valid = true;
-
-		if (valid) {
-			enum irqreturn ret;
-
-			ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd);
-			if (ret == IRQ_NONE) {
-				/* fall back to old school hpd */
-				old_bits |= (1 << intel_dig_port->base.hpd_pin);
-			}
-		}
-	}
-
-	if (old_bits) {
-		spin_lock_irq(&dev_priv->irq_lock);
-		dev_priv->hotplug.event_bits |= old_bits;
-		spin_unlock_irq(&dev_priv->irq_lock);
-		schedule_work(&dev_priv->hotplug.hotplug_work);
-	}
-}
-
-/*
- * Handle hotplug events outside the interrupt handler proper.
- */
-static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv);
-
-static void i915_hotplug_work_func(struct work_struct *work)
-{
-	struct drm_i915_private *dev_priv =
-		container_of(work, struct drm_i915_private, hotplug.hotplug_work);
-	struct drm_device *dev = dev_priv->dev;
-	struct drm_mode_config *mode_config = &dev->mode_config;
-	struct intel_connector *intel_connector;
-	struct intel_encoder *intel_encoder;
-	struct drm_connector *connector;
-	bool changed = false;
-	u32 hpd_event_bits;
-
-	mutex_lock(&mode_config->mutex);
-	DRM_DEBUG_KMS("running encoder hotplug functions\n");
-
-	spin_lock_irq(&dev_priv->irq_lock);
-
-	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);
-
-	spin_unlock_irq(&dev_priv->irq_lock);
-
-	list_for_each_entry(connector, &mode_config->connector_list, head) {
-		intel_connector = to_intel_connector(connector);
-		if (!intel_connector->encoder)
-			continue;
-		intel_encoder = intel_connector->encoder;
-		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
-			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
-				      connector->name, intel_encoder->hpd_pin);
-			if (intel_encoder->hot_plug)
-				intel_encoder->hot_plug(intel_encoder);
-			if (intel_hpd_irq_event(dev, connector))
-				changed = true;
-		}
-	}
-	mutex_unlock(&mode_config->mutex);
-
-	if (changed)
-		drm_kms_helper_hotplug_event(dev);
-}
-
 static void ironlake_rps_change_irq_handler(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1346,94 +1227,6 @@ static irqreturn_t gen8_gt_irq_handler(struct drm_i915_private *dev_priv,
 	return ret;
 }
 
-#define HPD_STORM_DETECT_PERIOD 1000
-#define HPD_STORM_THRESHOLD 5
-
-/**
- * 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
- *
- * 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.
- *
- * @HPD_STORM_THRESHOLD irqs are allowed within @HPD_STORM_DETECT_PERIOD ms,
- * otherwise it's considered an irq storm, and the irq state is set to
- * @HPD_MARK_DISABLED.
- *
- * 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)
-{
-	unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies;
-	unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
-	bool storm = 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 > HPD_STORM_THRESHOLD) {
-		dev_priv->hotplug.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);
-	}
-
-	return storm;
-}
-
-#define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
-
-static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv)
-{
-	struct drm_device *dev = dev_priv->dev;
-	struct drm_mode_config *mode_config = &dev->mode_config;
-	struct intel_connector *intel_connector;
-	struct intel_encoder *intel_encoder;
-	struct drm_connector *connector;
-	enum hpd_pin pin;
-	bool hpd_disabled = false;
-
-	assert_spin_locked(&dev_priv->irq_lock);
-
-	list_for_each_entry(connector, &mode_config->connector_list, head) {
-		if (connector->polled != DRM_CONNECTOR_POLL_HPD)
-			continue;
-
-		intel_connector = to_intel_connector(connector);
-		intel_encoder = intel_connector->encoder;
-		if (!intel_encoder)
-			continue;
-
-		pin = intel_encoder->hpd_pin;
-		if (pin == HPD_NONE ||
-		    dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED)
-			continue;
-
-		DRM_INFO("HPD interrupt storm detected on connector %s: "
-			 "switching from hotplug detection to polling\n",
-			 connector->name);
-
-		dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
-		connector->polled = DRM_CONNECTOR_POLL_CONNECT
-			| DRM_CONNECTOR_POLL_DISCONNECT;
-		hpd_disabled = true;
-	}
-
-	/* Enable polling and queue hotplug re-enabling. */
-	if (hpd_disabled) {
-		drm_kms_helper_poll_enable(dev);
-		mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
-				 msecs_to_jiffies(I915_REENABLE_HOTPLUG_DELAY));
-	}
-}
-
 static bool pch_port_hotplug_long_detect(enum port port, u32 val)
 {
 	switch (port) {
@@ -1462,20 +1255,6 @@ static bool i9xx_port_hotplug_long_detect(enum port port, u32 val)
 	}
 }
 
-static enum port get_port_from_pin(enum hpd_pin pin)
-{
-	switch (pin) {
-	case HPD_PORT_B:
-		return PORT_B;
-	case HPD_PORT_C:
-		return PORT_C;
-	case HPD_PORT_D:
-		return PORT_D;
-	default:
-		return PORT_A; /* no hpd */
-	}
-}
-
 /* Get a bit mask of pins that have triggered, and which ones may be long. */
 static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 			     u32 hotplug_trigger, u32 dig_hotplug_reg, const u32 hpd[HPD_NUM_PINS])
@@ -1492,7 +1271,7 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 		if (hpd[i] & hotplug_trigger) {
 			*pin_mask |= BIT(i);
 
-			if (pch_port_hotplug_long_detect(get_port_from_pin(i), dig_hotplug_reg))
+			if (pch_port_hotplug_long_detect(intel_hpd_pin_to_port(i), dig_hotplug_reg))
 				*long_mask |= BIT(i);
 		}
 	}
@@ -1518,7 +1297,7 @@ static void i9xx_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 		if (hpd[i] & hotplug_trigger) {
 			*pin_mask |= BIT(i);
 
-			if (i9xx_port_hotplug_long_detect(get_port_from_pin(i), hotplug_trigger))
+			if (i9xx_port_hotplug_long_detect(intel_hpd_pin_to_port(i), hotplug_trigger))
 				*long_mask |= BIT(i);
 		}
 	}
@@ -1527,104 +1306,6 @@ static void i9xx_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 			 hotplug_trigger, *pin_mask);
 }
 
-/**
- * intel_hpd_irq_handler - main hotplug irq handler
- * @dev: drm device
- * @pin_mask: a mask of hpd pins that have triggered the irq
- * @long_mask: a mask of hpd pins that may be long hpd pulses
- *
- * This is the main hotplug irq handler for all platforms. The platform specific
- * irq handlers call the platform specific hotplug irq handlers, which read and
- * decode the appropriate registers into bitmasks about hpd pins that have
- * triggered (@pin_mask), and which of those pins may be long pulses
- * (@long_mask). The @long_mask is ignored if the port corresponding to the pin
- * is not a digital port.
- *
- * Here, we do hotplug irq storm detection and mitigation, and pass further
- * processing to appropriate bottom halves.
- */
-static void intel_hpd_irq_handler(struct drm_device *dev,
-				  u32 pin_mask, u32 long_mask)
-{
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	int i;
-	enum port port;
-	bool storm_detected = false;
-	bool queue_dig = false, queue_hp = false;
-	bool is_dig_port;
-
-	if (!pin_mask)
-		return;
-
-	spin_lock(&dev_priv->irq_lock);
-	for_each_hpd_pin(i) {
-		if (!(BIT(i) & pin_mask))
-			continue;
-
-		port = get_port_from_pin(i);
-		is_dig_port = port && dev_priv->hotplug.irq_port[port];
-
-		if (is_dig_port) {
-			bool long_hpd = long_mask & BIT(i);
-
-			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;
-			}
-		}
-
-		if (dev_priv->hotplug.stats[i].state == HPD_DISABLED) {
-			/*
-			 * On GMCH platforms the interrupt mask bits only
-			 * prevent irq generation, not the setting of the
-			 * hotplug bits itself. So only WARN about unexpected
-			 * interrupts on saner platforms.
-			 */
-			WARN_ONCE(INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev),
-				  "Received HPD interrupt on pin %d although disabled\n", i);
-			continue;
-		}
-
-		if (dev_priv->hotplug.stats[i].state != HPD_ENABLED)
-			continue;
-
-		if (!is_dig_port) {
-			dev_priv->hotplug.event_bits |= BIT(i);
-			queue_hp = true;
-		}
-
-		if (intel_hpd_irq_storm_detect(dev_priv, i)) {
-			dev_priv->hotplug.event_bits &= ~BIT(i);
-			storm_detected = true;
-		}
-	}
-
-	if (storm_detected)
-		dev_priv->display.hpd_irq_setup(dev);
-	spin_unlock(&dev_priv->irq_lock);
-
-	/*
-	 * Our hotplug handler can grab modeset locks (by calling down into the
-	 * fb helpers). Hence it must not be run on our own dev-priv->wq work
-	 * queue for otherwise the flush_work in the pageflip code will
-	 * deadlock.
-	 */
-	if (queue_dig)
-		queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work);
-	if (queue_hp)
-		schedule_work(&dev_priv->hotplug.hotplug_work);
-}
-
 static void gmbus_irq_handler(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -4367,46 +4048,6 @@ static void i965_irq_uninstall(struct drm_device * dev)
 	I915_WRITE(IIR, I915_READ(IIR));
 }
 
-static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
-{
-	struct drm_i915_private *dev_priv =
-		container_of(work, typeof(*dev_priv),
-			     hotplug.reenable_work.work);
-	struct drm_device *dev = dev_priv->dev;
-	struct drm_mode_config *mode_config = &dev->mode_config;
-	int i;
-
-	intel_runtime_pm_get(dev_priv);
-
-	spin_lock_irq(&dev_priv->irq_lock);
-	for_each_hpd_pin(i) {
-		struct drm_connector *connector;
-
-		if (dev_priv->hotplug.stats[i].state != HPD_DISABLED)
-			continue;
-
-		dev_priv->hotplug.stats[i].state = HPD_ENABLED;
-
-		list_for_each_entry(connector, &mode_config->connector_list, head) {
-			struct intel_connector *intel_connector = to_intel_connector(connector);
-
-			if (intel_connector->encoder->hpd_pin == i) {
-				if (connector->polled != intel_connector->polled)
-					DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
-							 connector->name);
-				connector->polled = intel_connector->polled;
-				if (!connector->polled)
-					connector->polled = DRM_CONNECTOR_POLL_HPD;
-			}
-		}
-	}
-	if (dev_priv->display.hpd_irq_setup)
-		dev_priv->display.hpd_irq_setup(dev);
-	spin_unlock_irq(&dev_priv->irq_lock);
-
-	intel_runtime_pm_put(dev_priv);
-}
-
 /**
  * intel_irq_init - initializes irq support
  * @dev_priv: i915 device instance
@@ -4418,8 +4059,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 {
 	struct drm_device *dev = dev_priv->dev;
 
-	INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func);
-	INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
+	intel_hpd_init_work(dev_priv);
+
 	INIT_WORK(&dev_priv->rps.work, gen6_pm_rps_work);
 	INIT_WORK(&dev_priv->l3_parity.error_work, ivybridge_parity_work);
 
@@ -4432,8 +4073,6 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 
 	INIT_DELAYED_WORK(&dev_priv->gpu_error.hangcheck_work,
 			  i915_hangcheck_elapsed);
-	INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
-			  intel_hpd_irq_storm_reenable_work);
 
 	pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
 
@@ -4519,46 +4158,6 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 }
 
 /**
- * intel_hpd_init - initializes and enables hpd support
- * @dev_priv: i915 device instance
- *
- * This function enables the hotplug support. It requires that interrupts have
- * already been enabled with intel_irq_init_hw(). From this point on hotplug and
- * poll request can run concurrently to other code, so locking rules must be
- * obeyed.
- *
- * This is a separate step from interrupt enabling to simplify the locking rules
- * in the driver load and resume code.
- */
-void intel_hpd_init(struct drm_i915_private *dev_priv)
-{
-	struct drm_device *dev = dev_priv->dev;
-	struct drm_mode_config *mode_config = &dev->mode_config;
-	struct drm_connector *connector;
-	int i;
-
-	for_each_hpd_pin(i) {
-		dev_priv->hotplug.stats[i].count = 0;
-		dev_priv->hotplug.stats[i].state = HPD_ENABLED;
-	}
-	list_for_each_entry(connector, &mode_config->connector_list, head) {
-		struct intel_connector *intel_connector = to_intel_connector(connector);
-		connector->polled = intel_connector->polled;
-		if (connector->encoder && !connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE)
-			connector->polled = DRM_CONNECTOR_POLL_HPD;
-		if (intel_connector->mst_port)
-			connector->polled = DRM_CONNECTOR_POLL_HPD;
-	}
-
-	/* Interrupt setup is already guaranteed to be single-threaded, this is
-	 * just to make the assert_spin_locked checks happy. */
-	spin_lock_irq(&dev_priv->irq_lock);
-	if (dev_priv->display.hpd_irq_setup)
-		dev_priv->display.hpd_irq_setup(dev);
-	spin_unlock_irq(&dev_priv->irq_lock);
-}
-
-/**
  * intel_irq_install - enables the hardware interrupt
  * @dev_priv: i915 device instance
  *
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
new file mode 100644
index 000000000000..3c53aac71d98
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_hotplug.c
@@ -0,0 +1,452 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <linux/kernel.h>
+
+#include <drm/drmP.h>
+#include <drm/i915_drm.h>
+
+#include "i915_drv.h"
+#include "intel_drv.h"
+
+enum port intel_hpd_pin_to_port(enum hpd_pin pin)
+{
+	switch (pin) {
+	case HPD_PORT_B:
+		return PORT_B;
+	case HPD_PORT_C:
+		return PORT_C;
+	case HPD_PORT_D:
+		return PORT_D;
+	default:
+		return PORT_A; /* no hpd */
+	}
+}
+
+#define HPD_STORM_DETECT_PERIOD		1000
+#define HPD_STORM_THRESHOLD		5
+#define HPD_STORM_REENABLE_DELAY	(2 * 60 * 1000)
+
+/**
+ * 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
+ *
+ * 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.
+ *
+ * @HPD_STORM_THRESHOLD irqs are allowed within @HPD_STORM_DETECT_PERIOD ms,
+ * otherwise it's considered an irq storm, and the irq state is set to
+ * @HPD_MARK_DISABLED.
+ *
+ * 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)
+{
+	unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies;
+	unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
+	bool storm = 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 > HPD_STORM_THRESHOLD) {
+		dev_priv->hotplug.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);
+	}
+
+	return storm;
+}
+
+static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv)
+{
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct intel_connector *intel_connector;
+	struct intel_encoder *intel_encoder;
+	struct drm_connector *connector;
+	enum hpd_pin pin;
+	bool hpd_disabled = false;
+
+	assert_spin_locked(&dev_priv->irq_lock);
+
+	list_for_each_entry(connector, &mode_config->connector_list, head) {
+		if (connector->polled != DRM_CONNECTOR_POLL_HPD)
+			continue;
+
+		intel_connector = to_intel_connector(connector);
+		intel_encoder = intel_connector->encoder;
+		if (!intel_encoder)
+			continue;
+
+		pin = intel_encoder->hpd_pin;
+		if (pin == HPD_NONE ||
+		    dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED)
+			continue;
+
+		DRM_INFO("HPD interrupt storm detected on connector %s: "
+			 "switching from hotplug detection to polling\n",
+			 connector->name);
+
+		dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
+		connector->polled = DRM_CONNECTOR_POLL_CONNECT
+			| DRM_CONNECTOR_POLL_DISCONNECT;
+		hpd_disabled = true;
+	}
+
+	/* Enable polling and queue hotplug re-enabling. */
+	if (hpd_disabled) {
+		drm_kms_helper_poll_enable(dev);
+		mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
+				 msecs_to_jiffies(HPD_STORM_REENABLE_DELAY));
+	}
+}
+
+static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, typeof(*dev_priv),
+			     hotplug.reenable_work.work);
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	int i;
+
+	intel_runtime_pm_get(dev_priv);
+
+	spin_lock_irq(&dev_priv->irq_lock);
+	for_each_hpd_pin(i) {
+		struct drm_connector *connector;
+
+		if (dev_priv->hotplug.stats[i].state != HPD_DISABLED)
+			continue;
+
+		dev_priv->hotplug.stats[i].state = HPD_ENABLED;
+
+		list_for_each_entry(connector, &mode_config->connector_list, head) {
+			struct intel_connector *intel_connector = to_intel_connector(connector);
+
+			if (intel_connector->encoder->hpd_pin == i) {
+				if (connector->polled != intel_connector->polled)
+					DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
+							 connector->name);
+				connector->polled = intel_connector->polled;
+				if (!connector->polled)
+					connector->polled = DRM_CONNECTOR_POLL_HPD;
+			}
+		}
+	}
+	if (dev_priv->display.hpd_irq_setup)
+		dev_priv->display.hpd_irq_setup(dev);
+	spin_unlock_irq(&dev_priv->irq_lock);
+
+	intel_runtime_pm_put(dev_priv);
+}
+
+static bool intel_hpd_irq_event(struct drm_device *dev,
+				struct drm_connector *connector)
+{
+	enum drm_connector_status old_status;
+
+	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
+	old_status = connector->status;
+
+	connector->status = connector->funcs->detect(connector, false);
+	if (old_status == connector->status)
+		return false;
+
+	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
+		      connector->base.id,
+		      connector->name,
+		      drm_get_connector_status_name(old_status),
+		      drm_get_connector_status_name(connector->status));
+
+	return true;
+}
+
+static void i915_digport_work_func(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, struct drm_i915_private, hotplug.dig_port_work);
+	u32 long_port_mask, short_port_mask;
+	struct intel_digital_port *intel_dig_port;
+	int i;
+	u32 old_bits = 0;
+
+	spin_lock_irq(&dev_priv->irq_lock);
+	long_port_mask = dev_priv->hotplug.long_port_mask;
+	dev_priv->hotplug.long_port_mask = 0;
+	short_port_mask = dev_priv->hotplug.short_port_mask;
+	dev_priv->hotplug.short_port_mask = 0;
+	spin_unlock_irq(&dev_priv->irq_lock);
+
+	for (i = 0; i < I915_MAX_PORTS; i++) {
+		bool valid = false;
+		bool long_hpd = false;
+		intel_dig_port = dev_priv->hotplug.irq_port[i];
+		if (!intel_dig_port || !intel_dig_port->hpd_pulse)
+			continue;
+
+		if (long_port_mask & (1 << i))  {
+			valid = true;
+			long_hpd = true;
+		} else if (short_port_mask & (1 << i))
+			valid = true;
+
+		if (valid) {
+			enum irqreturn ret;
+
+			ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd);
+			if (ret == IRQ_NONE) {
+				/* fall back to old school hpd */
+				old_bits |= (1 << intel_dig_port->base.hpd_pin);
+			}
+		}
+	}
+
+	if (old_bits) {
+		spin_lock_irq(&dev_priv->irq_lock);
+		dev_priv->hotplug.event_bits |= old_bits;
+		spin_unlock_irq(&dev_priv->irq_lock);
+		schedule_work(&dev_priv->hotplug.hotplug_work);
+	}
+}
+
+/*
+ * Handle hotplug events outside the interrupt handler proper.
+ */
+static void i915_hotplug_work_func(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, struct drm_i915_private, hotplug.hotplug_work);
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct intel_connector *intel_connector;
+	struct intel_encoder *intel_encoder;
+	struct drm_connector *connector;
+	bool changed = false;
+	u32 hpd_event_bits;
+
+	mutex_lock(&mode_config->mutex);
+	DRM_DEBUG_KMS("running encoder hotplug functions\n");
+
+	spin_lock_irq(&dev_priv->irq_lock);
+
+	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);
+
+	spin_unlock_irq(&dev_priv->irq_lock);
+
+	list_for_each_entry(connector, &mode_config->connector_list, head) {
+		intel_connector = to_intel_connector(connector);
+		if (!intel_connector->encoder)
+			continue;
+		intel_encoder = intel_connector->encoder;
+		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
+			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
+				      connector->name, intel_encoder->hpd_pin);
+			if (intel_encoder->hot_plug)
+				intel_encoder->hot_plug(intel_encoder);
+			if (intel_hpd_irq_event(dev, connector))
+				changed = true;
+		}
+	}
+	mutex_unlock(&mode_config->mutex);
+
+	if (changed)
+		drm_kms_helper_hotplug_event(dev);
+}
+
+
+/**
+ * intel_hpd_irq_handler - main hotplug irq handler
+ * @dev: drm device
+ * @pin_mask: a mask of hpd pins that have triggered the irq
+ * @long_mask: a mask of hpd pins that may be long hpd pulses
+ *
+ * This is the main hotplug irq handler for all platforms. The platform specific
+ * irq handlers call the platform specific hotplug irq handlers, which read and
+ * decode the appropriate registers into bitmasks about hpd pins that have
+ * triggered (@pin_mask), and which of those pins may be long pulses
+ * (@long_mask). The @long_mask is ignored if the port corresponding to the pin
+ * is not a digital port.
+ *
+ * Here, we do hotplug irq storm detection and mitigation, and pass further
+ * processing to appropriate bottom halves.
+ */
+void intel_hpd_irq_handler(struct drm_device *dev,
+			   u32 pin_mask, u32 long_mask)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int i;
+	enum port port;
+	bool storm_detected = false;
+	bool queue_dig = false, queue_hp = false;
+	bool is_dig_port;
+
+	if (!pin_mask)
+		return;
+
+	spin_lock(&dev_priv->irq_lock);
+	for_each_hpd_pin(i) {
+		if (!(BIT(i) & pin_mask))
+			continue;
+
+		port = intel_hpd_pin_to_port(i);
+		is_dig_port = port && dev_priv->hotplug.irq_port[port];
+
+		if (is_dig_port) {
+			bool long_hpd = long_mask & BIT(i);
+
+			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;
+			}
+		}
+
+		if (dev_priv->hotplug.stats[i].state == HPD_DISABLED) {
+			/*
+			 * On GMCH platforms the interrupt mask bits only
+			 * prevent irq generation, not the setting of the
+			 * hotplug bits itself. So only WARN about unexpected
+			 * interrupts on saner platforms.
+			 */
+			WARN_ONCE(INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev),
+				  "Received HPD interrupt on pin %d although disabled\n", i);
+			continue;
+		}
+
+		if (dev_priv->hotplug.stats[i].state != HPD_ENABLED)
+			continue;
+
+		if (!is_dig_port) {
+			dev_priv->hotplug.event_bits |= BIT(i);
+			queue_hp = true;
+		}
+
+		if (intel_hpd_irq_storm_detect(dev_priv, i)) {
+			dev_priv->hotplug.event_bits &= ~BIT(i);
+			storm_detected = true;
+		}
+	}
+
+	if (storm_detected)
+		dev_priv->display.hpd_irq_setup(dev);
+	spin_unlock(&dev_priv->irq_lock);
+
+	/*
+	 * Our hotplug handler can grab modeset locks (by calling down into the
+	 * fb helpers). Hence it must not be run on our own dev-priv->wq work
+	 * queue for otherwise the flush_work in the pageflip code will
+	 * deadlock.
+	 */
+	if (queue_dig)
+		queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work);
+	if (queue_hp)
+		schedule_work(&dev_priv->hotplug.hotplug_work);
+}
+
+/**
+ * intel_hpd_init - initializes and enables hpd support
+ * @dev_priv: i915 device instance
+ *
+ * This function enables the hotplug support. It requires that interrupts have
+ * already been enabled with intel_irq_init_hw(). From this point on hotplug and
+ * poll request can run concurrently to other code, so locking rules must be
+ * obeyed.
+ *
+ * This is a separate step from interrupt enabling to simplify the locking rules
+ * in the driver load and resume code.
+ */
+void intel_hpd_init(struct drm_i915_private *dev_priv)
+{
+	struct drm_device *dev = dev_priv->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct drm_connector *connector;
+	int i;
+
+	for_each_hpd_pin(i) {
+		dev_priv->hotplug.stats[i].count = 0;
+		dev_priv->hotplug.stats[i].state = HPD_ENABLED;
+	}
+	list_for_each_entry(connector, &mode_config->connector_list, head) {
+		struct intel_connector *intel_connector = to_intel_connector(connector);
+		connector->polled = intel_connector->polled;
+		if (connector->encoder && !connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE)
+			connector->polled = DRM_CONNECTOR_POLL_HPD;
+		if (intel_connector->mst_port)
+			connector->polled = DRM_CONNECTOR_POLL_HPD;
+	}
+
+	/*
+	 * Interrupt setup is already guaranteed to be single-threaded, this is
+	 * just to make the assert_spin_locked checks happy.
+	 */
+	spin_lock_irq(&dev_priv->irq_lock);
+	if (dev_priv->display.hpd_irq_setup)
+		dev_priv->display.hpd_irq_setup(dev);
+	spin_unlock_irq(&dev_priv->irq_lock);
+}
+
+void intel_hpd_init_work(struct drm_i915_private *dev_priv)
+{
+	INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func);
+	INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
+	INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
+			  intel_hpd_irq_storm_reenable_work);
+}
+
+void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
+{
+	spin_lock_irq(&dev_priv->irq_lock);
+
+	dev_priv->hotplug.long_port_mask = 0;
+	dev_priv->hotplug.short_port_mask = 0;
+	dev_priv->hotplug.event_bits = 0;
+
+	spin_unlock_irq(&dev_priv->irq_lock);
+
+	cancel_work_sync(&dev_priv->hotplug.dig_port_work);
+	cancel_work_sync(&dev_priv->hotplug.hotplug_work);
+	cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
+}
-- 
2.1.4

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[PATCH 5/5] drm/i915: reduce line width in {pch, i9xx}_get_hpd_pins()

[Jani Nikula]

Make Paulo happier.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 2d3b2ccf9ce4..a6fbe6443d63 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1257,8 +1257,10 @@ static bool i9xx_port_hotplug_long_detect(enum port port, u32 val)
 
 /* Get a bit mask of pins that have triggered, and which ones may be long. */
 static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
-			     u32 hotplug_trigger, u32 dig_hotplug_reg, const u32 hpd[HPD_NUM_PINS])
+			     u32 hotplug_trigger, u32 dig_hotplug_reg,
+			     const u32 hpd[HPD_NUM_PINS])
 {
+	enum port port;
 	int i;
 
 	*pin_mask = 0;
@@ -1268,12 +1270,14 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 		return;
 
 	for_each_hpd_pin(i) {
-		if (hpd[i] & hotplug_trigger) {
-			*pin_mask |= BIT(i);
+		if ((hpd[i] & hotplug_trigger) == 0)
+			continue;
 
-			if (pch_port_hotplug_long_detect(intel_hpd_pin_to_port(i), dig_hotplug_reg))
-				*long_mask |= BIT(i);
-		}
+		*pin_mask |= BIT(i);
+
+		port = intel_hpd_pin_to_port(i);
+		if (pch_port_hotplug_long_detect(port, dig_hotplug_reg))
+			*long_mask |= BIT(i);
 	}
 
 	DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x, dig 0x%08x, pins 0x%08x\n",
@@ -1285,6 +1289,7 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 static void i9xx_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 			      u32 hotplug_trigger, const u32 hpd[HPD_NUM_PINS])
 {
+	enum port port;
 	int i;
 
 	*pin_mask = 0;
@@ -1294,12 +1299,14 @@ static void i9xx_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 		return;
 
 	for_each_hpd_pin(i) {
-		if (hpd[i] & hotplug_trigger) {
-			*pin_mask |= BIT(i);
+		if ((hpd[i] & hotplug_trigger) == 0)
+			continue;
 
-			if (i9xx_port_hotplug_long_detect(intel_hpd_pin_to_port(i), hotplug_trigger))
-				*long_mask |= BIT(i);
-		}
+		*pin_mask |= BIT(i);
+
+		port = intel_hpd_pin_to_port(i);
+		if (i9xx_port_hotplug_long_detect(port, hotplug_trigger))
+			*long_mask |= BIT(i);
 	}
 
 	DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x, pins 0x%08x\n",
-- 
2.1.4

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Re: [PATCH 1/5] drm/i915/irq: move hotplug even debug print to second connector loop

[Chris Wilson]

Subject s/even/event/

On Thu, Jun 18, 2015 at 01:06:13PM +0300, Jani Nikula wrote:
> The hotplug work function has two loops iterating over connectors, the
> first for handling hotplug disabling due to irq storms and the second
> for actually handling the hotplug events. Move the debug printing into
> the second one, so we can abstract the storm handling better. This may
> change the output ordering slightly when there are multiple simultaneous
> hotplug events.
> 
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_irq.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 56db9e747464..d64d6895a2e5 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -917,10 +917,6 @@ static void i915_hotplug_work_func(struct work_struct *work)
>  				| DRM_CONNECTOR_POLL_DISCONNECT;
>  			hpd_disabled = true;
>  		}
> -		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
> -			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
> -				      connector->name, intel_encoder->hpd_pin);
> -		}
>  	}
>  	 /* if there were no outputs to poll, poll was disabled,
>  	  * therefore make sure it's enabled when disabling HPD on
> @@ -939,6 +935,8 @@ static void i915_hotplug_work_func(struct work_struct *work)
>  			continue;
>  		intel_encoder = intel_connector->encoder;
>  		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
> +			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
> +				      connector->name, intel_encoder->hpd_pin);

In light of other conversations, is reporting an irq (even a hotplug
one) directly related to KMS? I think DRIVER is more specific in this
case.
-Chris

-- 
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Re: [PATCH 1/5] drm/i915/irq: move hotplug even debug print to second connector loop

[Jani Nikula]

On Thu, 18 Jun 2015, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> Subject s/even/event/

Oops.

> On Thu, Jun 18, 2015 at 01:06:13PM +0300, Jani Nikula wrote:
>> The hotplug work function has two loops iterating over connectors, the
>> first for handling hotplug disabling due to irq storms and the second
>> for actually handling the hotplug events. Move the debug printing into
>> the second one, so we can abstract the storm handling better. This may
>> change the output ordering slightly when there are multiple simultaneous
>> hotplug events.
>> 
>> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
>> ---
>>  drivers/gpu/drm/i915/i915_irq.c | 6 ++----
>>  1 file changed, 2 insertions(+), 4 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index 56db9e747464..d64d6895a2e5 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -917,10 +917,6 @@ static void i915_hotplug_work_func(struct work_struct *work)
>>  				| DRM_CONNECTOR_POLL_DISCONNECT;
>>  			hpd_disabled = true;
>>  		}
>> -		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
>> -			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
>> -				      connector->name, intel_encoder->hpd_pin);
>> -		}
>>  	}
>>  	 /* if there were no outputs to poll, poll was disabled,
>>  	  * therefore make sure it's enabled when disabling HPD on
>> @@ -939,6 +935,8 @@ static void i915_hotplug_work_func(struct work_struct *work)
>>  			continue;
>>  		intel_encoder = intel_connector->encoder;
>>  		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
>> +			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
>> +				      connector->name, intel_encoder->hpd_pin);
>
> In light of other conversations, is reporting an irq (even a hotplug
> one) directly related to KMS? I think DRIVER is more specific in this
> case.

Perhaps; this patch was just about moving the call around. A more
thorough cleanup of the debugging could be a follow-up.

BR,
Jani.



> -Chris
>
> -- 
> Chris Wilson, Intel Open Source Technology Centre

-- 
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Re: [PATCH 1/5] drm/i915/irq: move hotplug even debug print to second connector loop

[Chris Wilson]

On Thu, Jun 18, 2015 at 01:43:30PM +0300, Jani Nikula wrote:
> On Thu, 18 Jun 2015, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> > Subject s/even/event/
> 
> Oops.
> 
> > On Thu, Jun 18, 2015 at 01:06:13PM +0300, Jani Nikula wrote:
> >> The hotplug work function has two loops iterating over connectors, the
> >> first for handling hotplug disabling due to irq storms and the second
> >> for actually handling the hotplug events. Move the debug printing into
> >> the second one, so we can abstract the storm handling better. This may
> >> change the output ordering slightly when there are multiple simultaneous
> >> hotplug events.
> >> 
> >> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> >> ---
> >>  drivers/gpu/drm/i915/i915_irq.c | 6 ++----
> >>  1 file changed, 2 insertions(+), 4 deletions(-)
> >> 
> >> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> >> index 56db9e747464..d64d6895a2e5 100644
> >> --- a/drivers/gpu/drm/i915/i915_irq.c
> >> +++ b/drivers/gpu/drm/i915/i915_irq.c
> >> @@ -917,10 +917,6 @@ static void i915_hotplug_work_func(struct work_struct *work)
> >>  				| DRM_CONNECTOR_POLL_DISCONNECT;
> >>  			hpd_disabled = true;
> >>  		}
> >> -		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
> >> -			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
> >> -				      connector->name, intel_encoder->hpd_pin);
> >> -		}
> >>  	}
> >>  	 /* if there were no outputs to poll, poll was disabled,
> >>  	  * therefore make sure it's enabled when disabling HPD on
> >> @@ -939,6 +935,8 @@ static void i915_hotplug_work_func(struct work_struct *work)
> >>  			continue;
> >>  		intel_encoder = intel_connector->encoder;
> >>  		if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
> >> +			DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
> >> +				      connector->name, intel_encoder->hpd_pin);
> >
> > In light of other conversations, is reporting an irq (even a hotplug
> > one) directly related to KMS? I think DRIVER is more specific in this
> > case.
> 
> Perhaps; this patch was just about moving the call around. A more
> thorough cleanup of the debugging could be a follow-up.

I was looking for filler, I didn't want to just send a spelling fix
without at least some discussion of the patch! :)
-Chris

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Re: [Intel-gfx] [PATCH 2/5] drm/i915/irq: abstract irq storm hotplug disabling

[Daniel Vetter]

On Thu, Jun 18, 2015 at 01:06:14PM +0300, Jani Nikula wrote:
> Continue abstracting hotplug storm related functions to clarify the
> code. This time, abstract hotplug irq storm related hotplug
> disabling. While at it, clean up the loop iterating over connectors for
> readability.
> 
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_irq.c | 77 ++++++++++++++++++++++++++---------------
>  1 file changed, 50 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index d64d6895a2e5..bf4c15d0ea2b 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -879,7 +879,7 @@ static void i915_digport_work_func(struct work_struct *work)
>  /*
>   * Handle hotplug events outside the interrupt handler proper.
>   */
> -#define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
> +static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv);
>  
>  static void i915_hotplug_work_func(struct work_struct *work)
>  {
> @@ -890,7 +890,6 @@ static void i915_hotplug_work_func(struct work_struct *work)
>  	struct intel_connector *intel_connector;
>  	struct intel_encoder *intel_encoder;
>  	struct drm_connector *connector;
> -	bool hpd_disabled = false;
>  	bool changed = false;
>  	u32 hpd_event_bits;
>  
> @@ -901,31 +900,9 @@ static void i915_hotplug_work_func(struct work_struct *work)
>  
>  	hpd_event_bits = dev_priv->hotplug.event_bits;
>  	dev_priv->hotplug.event_bits = 0;
> -	list_for_each_entry(connector, &mode_config->connector_list, head) {

Random comment: We have piles of connector_list walking in probe codde,
and DP MST adds/removes them without much thought really users of these.
Dave? Do we need a connector_list spinlock?

Just grabbing one of the modeset locks won't cut it I think since it'll
serialize way too much.
-Daniel
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Re: [PATCH 5/5] drm/i915: reduce line width in {pch, i9xx}_get_hpd_pins()

[Daniel Vetter]

On Thu, Jun 18, 2015 at 01:06:17PM +0300, Jani Nikula wrote:
> Make Paulo happier.

Cc'ing Paulo next time around would help for him to appreciate this
properly ;-)
-Daniel

> 
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_irq.c | 29 ++++++++++++++++++-----------
>  1 file changed, 18 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 2d3b2ccf9ce4..a6fbe6443d63 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1257,8 +1257,10 @@ static bool i9xx_port_hotplug_long_detect(enum port port, u32 val)
>  
>  /* Get a bit mask of pins that have triggered, and which ones may be long. */
>  static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
> -			     u32 hotplug_trigger, u32 dig_hotplug_reg, const u32 hpd[HPD_NUM_PINS])
> +			     u32 hotplug_trigger, u32 dig_hotplug_reg,
> +			     const u32 hpd[HPD_NUM_PINS])
>  {
> +	enum port port;
>  	int i;
>  
>  	*pin_mask = 0;
> @@ -1268,12 +1270,14 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
>  		return;
>  
>  	for_each_hpd_pin(i) {
> -		if (hpd[i] & hotplug_trigger) {
> -			*pin_mask |= BIT(i);
> +		if ((hpd[i] & hotplug_trigger) == 0)
> +			continue;
>  
> -			if (pch_port_hotplug_long_detect(intel_hpd_pin_to_port(i), dig_hotplug_reg))
> -				*long_mask |= BIT(i);
> -		}
> +		*pin_mask |= BIT(i);
> +
> +		port = intel_hpd_pin_to_port(i);
> +		if (pch_port_hotplug_long_detect(port, dig_hotplug_reg))
> +			*long_mask |= BIT(i);
>  	}
>  
>  	DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x, dig 0x%08x, pins 0x%08x\n",
> @@ -1285,6 +1289,7 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
>  static void i9xx_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
>  			      u32 hotplug_trigger, const u32 hpd[HPD_NUM_PINS])
>  {
> +	enum port port;
>  	int i;
>  
>  	*pin_mask = 0;
> @@ -1294,12 +1299,14 @@ static void i9xx_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
>  		return;
>  
>  	for_each_hpd_pin(i) {
> -		if (hpd[i] & hotplug_trigger) {
> -			*pin_mask |= BIT(i);
> +		if ((hpd[i] & hotplug_trigger) == 0)
> +			continue;
>  
> -			if (i9xx_port_hotplug_long_detect(intel_hpd_pin_to_port(i), hotplug_trigger))
> -				*long_mask |= BIT(i);
> -		}
> +		*pin_mask |= BIT(i);
> +
> +		port = intel_hpd_pin_to_port(i);
> +		if (i9xx_port_hotplug_long_detect(port, hotplug_trigger))
> +			*long_mask |= BIT(i);
>  	}
>  
>  	DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x, pins 0x%08x\n",
> -- 
> 2.1.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH 0/5] drm/i915: hotplug cleanup saga continues

[Daniel Vetter]

On Thu, Jun 18, 2015 at 01:06:12PM +0300, Jani Nikula wrote:
> Some cleanups, but mostly move all platform independent, generic hotplug
> code to new intel_hotplug.c.
> 
> The expected follow-up would be to document hotplug with a DOC: comment
> and add kerneldoc for the most important functions.

Merged under the assumption that you'll deliver the promised kerneldoc ;-)

Thanks, Daniel
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Re: [Intel-gfx] [PATCH 2/5] drm/i915/irq: abstract irq storm hotplug disabling

[Dave Airlie]

On 22 June 2015 at 23:02, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Thu, Jun 18, 2015 at 01:06:14PM +0300, Jani Nikula wrote:
>> Continue abstracting hotplug storm related functions to clarify the
>> code. This time, abstract hotplug irq storm related hotplug
>> disabling. While at it, clean up the loop iterating over connectors for
>> readability.
>>
>> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
>> ---
>>  drivers/gpu/drm/i915/i915_irq.c | 77 ++++++++++++++++++++++++++---------------
>>  1 file changed, 50 insertions(+), 27 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index d64d6895a2e5..bf4c15d0ea2b 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -879,7 +879,7 @@ static void i915_digport_work_func(struct work_struct *work)
>>  /*
>>   * Handle hotplug events outside the interrupt handler proper.
>>   */
>> -#define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
>> +static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv);
>>
>>  static void i915_hotplug_work_func(struct work_struct *work)
>>  {
>> @@ -890,7 +890,6 @@ static void i915_hotplug_work_func(struct work_struct *work)
>>       struct intel_connector *intel_connector;
>>       struct intel_encoder *intel_encoder;
>>       struct drm_connector *connector;
>> -     bool hpd_disabled = false;
>>       bool changed = false;
>>       u32 hpd_event_bits;
>>
>> @@ -901,31 +900,9 @@ static void i915_hotplug_work_func(struct work_struct *work)
>>
>>       hpd_event_bits = dev_priv->hotplug.event_bits;
>>       dev_priv->hotplug.event_bits = 0;
>> -     list_for_each_entry(connector, &mode_config->connector_list, head) {
>
> Random comment: We have piles of connector_list walking in probe codde,
> and DP MST adds/removes them without much thought really users of these.
> Dave? Do we need a connector_list spinlock?
>
> Just grabbing one of the modeset locks won't cut it I think since it'll
> serialize way too much.

In my tree currently this code grabs mode_config->mutex, so it should
be fine wrt
the connector list disappearing, as removing connectors is protected
my mode_config->mutex
as well.

if we do add a spinlock, we need to be careful about dropping it and restarting
the loops etc, as I would guess there are a fair few paths we don't
want to descend
holding the spin lock, due to possible sleeping/scheduling etc.

I think the intel_hpd_irq_reenable_work is the one that stands out to
me, the short
hotplug paths don't traverse connector lists deliberately to avoid the problem.

Dave.
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Re: [PATCH 2/5] drm/i915/irq: abstract irq storm hotplug disabling

[Daniel Vetter]

On Tue, Jun 23, 2015 at 10:29:27AM +1000, Dave Airlie wrote:
> On 22 June 2015 at 23:02, Daniel Vetter <daniel@ffwll.ch> wrote:
> > On Thu, Jun 18, 2015 at 01:06:14PM +0300, Jani Nikula wrote:
> >> Continue abstracting hotplug storm related functions to clarify the
> >> code. This time, abstract hotplug irq storm related hotplug
> >> disabling. While at it, clean up the loop iterating over connectors for
> >> readability.
> >>
> >> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> >> ---
> >>  drivers/gpu/drm/i915/i915_irq.c | 77 ++++++++++++++++++++++++++---------------
> >>  1 file changed, 50 insertions(+), 27 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> >> index d64d6895a2e5..bf4c15d0ea2b 100644
> >> --- a/drivers/gpu/drm/i915/i915_irq.c
> >> +++ b/drivers/gpu/drm/i915/i915_irq.c
> >> @@ -879,7 +879,7 @@ static void i915_digport_work_func(struct work_struct *work)
> >>  /*
> >>   * Handle hotplug events outside the interrupt handler proper.
> >>   */
> >> -#define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
> >> +static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv);
> >>
> >>  static void i915_hotplug_work_func(struct work_struct *work)
> >>  {
> >> @@ -890,7 +890,6 @@ static void i915_hotplug_work_func(struct work_struct *work)
> >>       struct intel_connector *intel_connector;
> >>       struct intel_encoder *intel_encoder;
> >>       struct drm_connector *connector;
> >> -     bool hpd_disabled = false;
> >>       bool changed = false;
> >>       u32 hpd_event_bits;
> >>
> >> @@ -901,31 +900,9 @@ static void i915_hotplug_work_func(struct work_struct *work)
> >>
> >>       hpd_event_bits = dev_priv->hotplug.event_bits;
> >>       dev_priv->hotplug.event_bits = 0;
> >> -     list_for_each_entry(connector, &mode_config->connector_list, head) {
> >
> > Random comment: We have piles of connector_list walking in probe codde,
> > and DP MST adds/removes them without much thought really users of these.
> > Dave? Do we need a connector_list spinlock?
> >
> > Just grabbing one of the modeset locks won't cut it I think since it'll
> > serialize way too much.
> 
> In my tree currently this code grabs mode_config->mutex, so it should
> be fine wrt
> the connector list disappearing, as removing connectors is protected
> my mode_config->mutex
> as well.

Hm right I mixed things up and didn't realize this is protected by the
mode_config->mutex.

> if we do add a spinlock, we need to be careful about dropping it and restarting
> the loops etc, as I would guess there are a fair few paths we don't
> want to descend
> holding the spin lock, due to possible sleeping/scheduling etc.
> 
> I think the intel_hpd_irq_reenable_work is the one that stands out to
> me, the short
> hotplug paths don't traverse connector lists deliberately to avoid the problem.

I think grabbing the mode_config->mutex in there should be fine. Looks
like we can stretch just grabbing mode_config->mutex for a bit longer ;-)
Jani, can you perhaps throw this in with your next round of hpd cleanup?
-Daniel
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Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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