From: Egbert Eich <eich@suse.de>
To: intel-gfx@lists.freedesktop.org
Cc: Egbert Eich <eich@suse.de>,
Daniel Vetter <daniel.vetter@intel.com>,
Chris Wilson <chris.wilson@intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>
Subject: [PATCH 7/8] drm/i915: When detecting a hotplug IRQ storm disable respective IRQs.
Date: Thu, 10 Jan 2013 10:02:45 -0500 [thread overview]
Message-ID: <1357830166-18049-8-git-send-email-eich@suse.de> (raw)
In-Reply-To: <1357830166-18049-1-git-send-email-eich@suse.de>
This patch disables hotplug interrupts if an 'interrupt storm'
has been detected.
Noise on the interrupt line renders the hotplug interrupt useless:
each hotplug event causes the devices to be rescanned which will
will only increase the system load.
Thus disable the hotplug interrupts and fall back to periodic
device polling.
Signed-off-by: Egbert Eich <eich@suse.de>
---
drivers/gpu/drm/i915/i915_irq.c | 25 +++++++++++++++++++------
1 files changed, 19 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 2da788f..aa4986d 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -313,12 +313,13 @@ static void i915_hotplug_work_func(struct work_struct *work)
drm_helper_hpd_irq_event(dev);
}
-static inline void hotplug_irq_storm_detect(struct drm_device *dev, u32 hotplug_trigger)
+static inline int hotplug_irq_storm_detect(struct drm_device *dev, u32 hotplug_trigger)
{
struct drm_mode_config *mode_config = &dev->mode_config;
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_connector *connector;
unsigned long irqflags;
+ int ret = 0;
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
@@ -335,12 +336,15 @@ static inline void hotplug_irq_storm_detect(struct drm_device *dev, u32 hotplug_
intel_connector->hpd_mark_disabled = 1;
pr_warn("HPD interrupt storm on connector %s disabling\n",
drm_get_connector_name(connector));
+ ret = 1;
} else
intel_connector->hpd_cnt++;
}
}
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+
+ return ret;
}
/* defined intel_pm.c */
@@ -652,7 +656,8 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
hotplug_status);
if (hotplug_trigger) {
- hotplug_irq_storm_detect(dev, hotplug_trigger);
+ if (hotplug_irq_storm_detect(dev, hotplug_trigger))
+ valleyview_enable_hotplug_irq(dev);
queue_work(dev_priv->wq,
&dev_priv->hotplug_work);
}
@@ -675,6 +680,8 @@ out:
return ret;
}
+static void ibx_enable_hotplug_irq(struct drm_device *dev);
+
static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
@@ -682,7 +689,8 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
u32 hotplug_trigger = pch_iir & dev_priv->hotplug_supported_mask;
if (hotplug_trigger) {
- hotplug_irq_storm_detect(dev, hotplug_trigger);
+ if (hotplug_irq_storm_detect(dev, hotplug_trigger))
+ ibx_enable_hotplug_irq(dev);
queue_work(dev_priv->wq, &dev_priv->hotplug_work);
}
if (pch_iir & SDE_AUDIO_POWER_MASK)
@@ -720,6 +728,8 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
DRM_DEBUG_DRIVER("PCH transcoder A underrun interrupt\n");
}
+static void cpt_enable_hotplug_irq(struct drm_device *dev);
+
static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
@@ -727,7 +737,8 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
u32 hotplug_trigger = pch_iir & dev_priv->hotplug_supported_mask;
if (hotplug_trigger) {
- hotplug_irq_storm_detect(dev, hotplug_trigger);
+ if (hotplug_irq_storm_detect(dev, hotplug_trigger))
+ cpt_enable_hotplug_irq(dev);
queue_work(dev_priv->wq, &dev_priv->hotplug_work);
}
if (pch_iir & SDE_AUDIO_POWER_MASK_CPT)
@@ -2443,7 +2454,8 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
hotplug_status);
if (hotplug_trigger) {
- hotplug_irq_storm_detect(dev, hotplug_trigger);
+ if (hotplug_irq_storm_detect(dev, hotplug_trigger))
+ i915_enable_hotplug_irq(dev);
queue_work(dev_priv->wq,
&dev_priv->hotplug_work);
}
@@ -2694,7 +2706,8 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
hotplug_status);
if (hotplug_trigger) {
- hotplug_irq_storm_detect(dev, hotplug_trigger);
+ if (hotplug_irq_storm_detect(dev, hotplug_trigger))
+ i965_enable_hotplug_irq(dev);
queue_work(dev_priv->wq,
&dev_priv->hotplug_work);
}
--
1.7.7
next prev parent reply other threads:[~2013-01-10 15:04 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-10 15:02 [PATCH 0/8] Detect and deal with Interrupt 'Storms' from noisy Hotplug Lines Egbert Eich
2013-01-10 15:02 ` [PATCH 1/8] drm/i915: Remove pch_rq_mask from struct drm_i915_private Egbert Eich
2013-01-11 20:13 ` Daniel Vetter
2013-01-10 15:02 ` [PATCH 2/8] drm/i915: Set hotplug_supported_flag for all chipset generations Egbert Eich
2013-03-26 19:51 ` Jesse Barnes
2013-01-10 15:02 ` [PATCH 3/8] drm/i915: Add hpd status bit to struct intel_connector Egbert Eich
2013-03-26 19:53 ` Jesse Barnes
2013-01-10 15:02 ` [PATCH 4/8] drm/i915: Add Hotplug IRQ Storm detection Egbert Eich
2013-03-26 19:59 ` Jesse Barnes
2013-01-10 15:02 ` [PATCH 5/8] drm/i915: Move hotplug interrupt enable for i915/i965/valleyview into a separate function Egbert Eich
2013-03-26 20:04 ` Jesse Barnes
2013-01-10 15:02 ` [PATCH 6/8] drm/i915: Only enable hotplug irq when needed on Ironlake and later chips Egbert Eich
2013-01-10 15:02 ` Egbert Eich [this message]
2013-01-10 15:02 ` [PATCH 8/8] drm/i915: Add Reenable Timer to turn Hotplug Detection back on Egbert Eich
2013-01-11 20:34 ` [PATCH 0/8] Detect and deal with Interrupt 'Storms' from noisy Hotplug Lines Daniel Vetter
2013-01-17 14:01 ` Egbert Eich
2013-01-17 14:45 ` Daniel Vetter
2013-01-22 13:22 ` Egbert Eich
2013-01-22 13:48 ` Daniel Vetter
2013-01-22 15:11 ` Egbert Eich
2013-02-25 17:06 ` [PATCH v.2 00/12] " Egbert Eich
2013-02-25 17:06 ` [PATCH v.2 01/12] DRM/i915: Remove valleyview_hpd_irq_setup Egbert Eich
2013-03-26 20:06 ` Jesse Barnes
2013-02-25 17:06 ` [PATCH v.2 02/12] DRM/I915: Add enum hpd_pin to intel_encoder Egbert Eich
2013-03-26 20:07 ` Jesse Barnes
2013-02-25 17:06 ` [PATCH v.2 03/12] DRM/i915: Convert HPD interrupts to make use of HPD pin assignment in encoders Egbert Eich
2013-02-28 0:12 ` Chris Wilson
2013-02-28 9:17 ` [PATCH v.2 03/12] DRM/i915: Convert HPD interrupts to make use of HPD pin assignment in encoders (v2) Egbert Eich
2013-03-26 20:08 ` [PATCH v.2 03/12] DRM/i915: Convert HPD interrupts to make use of HPD pin assignment in encoders Jesse Barnes
2013-02-25 17:06 ` [PATCH v.2 04/12] DRM/i915: Remove i965_hpd_irq_setup Egbert Eich
2013-02-25 17:06 ` [PATCH v.2 05/12] DRM/i915: Get rid if the 'hotplug_supported_mask' in struct drm_i915_private Egbert Eich
2013-03-26 21:06 ` Daniel Vetter
2013-03-27 15:08 ` Egbert Eich
2013-02-25 17:06 ` [PATCH v.2 06/12] DRM/i915: Add HPD IRQ storm detection Egbert Eich
2013-02-28 0:30 ` Chris Wilson
2013-02-28 9:19 ` [PATCH v.2 06/12] DRM/i915: Add HPD IRQ storm detection (v2) Egbert Eich
2013-03-03 18:07 ` Daniel Vetter
2013-03-05 7:38 ` [PATCH v.3 06/12] DRM/i915: Add HPD IRQ storm detection (v3) Egbert Eich
2013-03-05 7:48 ` [PATCH v.2 10/12] DRM/i915: Add Reenable Timer to turn Hotplug Detection back on (v2) Egbert Eich
2013-03-05 10:28 ` Ville Syrjälä
2013-03-05 12:26 ` [PATCH v.3 10/12] DRM/i915: Add Reenable Timer to turn Hotplug Detection back on (v3) Egbert Eich
2013-03-05 7:55 ` [PATCH v.2 11/12] DRM/i915: Add bit field to record which pins have received HPD events (v2) Egbert Eich
2013-03-05 13:00 ` [PATCH v.3 11/12] DRM/i915: Add bit field to record which pins have received HPD events (v3) Egbert Eich
2013-03-05 14:52 ` Egbert Eich
2013-02-25 17:06 ` [PATCH v.2 07/12] DRM/i915: (re)init HPD interrupt storm statistics Egbert Eich
2013-02-25 17:06 ` [PATCH v.2 08/12] DRM/i915: Treat hpd_irq_setup() for ironake and older generations the same way Egbert Eich
2013-02-25 17:06 ` [PATCH v.2 09/12] DRM/i915: Disable HPD interrupt on pin when irq storm is detected Egbert Eich
2013-03-05 12:34 ` [PATCH v.2 09/12] DRM/i915: Disable HPD interrupt on pin when irq storm is detected (v2) Egbert Eich
2013-02-25 17:06 ` [PATCH v.2 10/12] DRM/i915: Add Reenable Timer to turn Hotplug Detection back on Egbert Eich
2013-03-27 15:12 ` Daniel Vetter
2013-02-25 17:06 ` [PATCH v.2 11/12] DRM/i915: Add bit field to record which pins have received HPD events Egbert Eich
2013-02-25 17:06 ` [PATCH v.2 12/12] DRM/i915: Only reprobe display on encoder which has received an HPD event Egbert Eich
2013-03-05 14:18 ` [PATCH v.3 " Egbert Eich
2013-02-28 0:46 ` [PATCH v.2 00/12] Detect and deal with Interrupt 'Storms' from noisy Hotplug Lines Chris Wilson
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