blob: e8ff154fcf5301a2fb2f753cd997db8e90d613c1 [file] [log] [blame]
From bd0d40aee3ddd369389f22cc0166a7c480e073eb Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 4 Jul 2013 23:35:25 +0200
Subject: drm/i915: irq handlers don't need interrupt-safe spinlocks
Since we only have one interrupt handler and interrupt handlers are
non-reentrant.
To drive the point really home give them all an _irq_handler suffix.
This is a tiny micro-optimization but even more important it makes it
clearer what locking we actually need. And in case someone screws this
up: lockdep will catch hardirq vs. other context deadlocks.
v2: Fix up compile fail.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
(cherry picked from commit d0ecd7e221c87514b1eca84b11fee1e262f5d816)
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
---
drivers/gpu/drm/i915/i915_irq.c | 42 ++++++++++++++++++-----------------------
1 file changed, 18 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index aeb2232a9e76..4eaa79f7b49d 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -656,14 +656,13 @@ static void i915_hotplug_work_func(struct work_struct *work)
drm_kms_helper_hotplug_event(dev);
}
-static void ironlake_handle_rps_change(struct drm_device *dev)
+static void ironlake_rps_change_irq_handler(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
u32 busy_up, busy_down, max_avg, min_avg;
u8 new_delay;
- unsigned long flags;
- spin_lock_irqsave(&mchdev_lock, flags);
+ spin_lock(&mchdev_lock);
I915_WRITE16(MEMINTRSTS, I915_READ(MEMINTRSTS));
@@ -691,7 +690,7 @@ static void ironlake_handle_rps_change(struct drm_device *dev)
if (ironlake_set_drps(dev, new_delay))
dev_priv->ips.cur_delay = new_delay;
- spin_unlock_irqrestore(&mchdev_lock, flags);
+ spin_unlock(&mchdev_lock);
return;
}
@@ -835,18 +834,17 @@ static void ivybridge_parity_work(struct work_struct *work)
kfree(parity_event[1]);
}
-static void ivybridge_handle_parity_error(struct drm_device *dev)
+static void ivybridge_parity_error_irq_handler(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
- unsigned long flags;
if (!HAS_L3_GPU_CACHE(dev))
return;
- spin_lock_irqsave(&dev_priv->irq_lock, flags);
+ spin_lock(&dev_priv->irq_lock);
dev_priv->gt_irq_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
- spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
+ spin_unlock(&dev_priv->irq_lock);
queue_work(dev_priv->wq, &dev_priv->l3_parity.error_work);
}
@@ -872,15 +870,13 @@ static void snb_gt_irq_handler(struct drm_device *dev,
}
if (gt_iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT)
- ivybridge_handle_parity_error(dev);
+ ivybridge_parity_error_irq_handler(dev);
}
/* Legacy way of handling PM interrupts */
-static void gen6_queue_rps_work(struct drm_i915_private *dev_priv,
- u32 pm_iir)
+static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv,
+ u32 pm_iir)
{
- unsigned long flags;
-
/*
* IIR bits should never already be set because IMR should
* prevent an interrupt from being shown in IIR. The warning
@@ -891,11 +887,11 @@ static void gen6_queue_rps_work(struct drm_i915_private *dev_priv,
* The mask bit in IMR is cleared by dev_priv->rps.work.
*/
- spin_lock_irqsave(&dev_priv->rps.lock, flags);
+ spin_lock(&dev_priv->rps.lock);
dev_priv->rps.pm_iir |= pm_iir;
I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
POSTING_READ(GEN6_PMIMR);
- spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
+ spin_unlock(&dev_priv->rps.lock);
queue_work(dev_priv->wq, &dev_priv->rps.work);
}
@@ -959,7 +955,7 @@ static void dp_aux_irq_handler(struct drm_device *dev)
wake_up_all(&dev_priv->gmbus_wait_queue);
}
-/* Unlike gen6_queue_rps_work() from which this function is originally derived,
+/* Unlike gen6_rps_irq_handler() from which this function is originally derived,
* we must be able to deal with other PM interrupts. This is complicated because
* of the way in which we use the masks to defer the RPS work (which for
* posterity is necessary because of forcewake).
@@ -967,9 +963,7 @@ static void dp_aux_irq_handler(struct drm_device *dev)
static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv,
u32 pm_iir)
{
- unsigned long flags;
-
- spin_lock_irqsave(&dev_priv->rps.lock, flags);
+ spin_lock(&dev_priv->rps.lock);
dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS;
if (dev_priv->rps.pm_iir) {
I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
@@ -978,7 +972,7 @@ static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv,
/* TODO: if queue_work is slow, move it out of the spinlock */
queue_work(dev_priv->wq, &dev_priv->rps.work);
}
- spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
+ spin_unlock(&dev_priv->rps.lock);
if (pm_iir & ~GEN6_PM_RPS_EVENTS) {
if (pm_iir & PM_VEBOX_USER_INTERRUPT)
@@ -1060,7 +1054,7 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
gmbus_irq_handler(dev);
if (pm_iir & GEN6_PM_RPS_EVENTS)
- gen6_queue_rps_work(dev_priv, pm_iir);
+ gen6_rps_irq_handler(dev_priv, pm_iir);
I915_WRITE(GTIIR, gt_iir);
I915_WRITE(GEN6_PMIIR, pm_iir);
@@ -1298,7 +1292,7 @@ static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
if (IS_HASWELL(dev))
hsw_pm_irq_handler(dev_priv, pm_iir);
else if (pm_iir & GEN6_PM_RPS_EVENTS)
- gen6_queue_rps_work(dev_priv, pm_iir);
+ gen6_rps_irq_handler(dev_priv, pm_iir);
I915_WRITE(GEN6_PMIIR, pm_iir);
ret = IRQ_HANDLED;
}
@@ -1415,10 +1409,10 @@ static irqreturn_t ironlake_irq_handler(int irq, void *arg)
}
if (IS_GEN5(dev) && de_iir & DE_PCU_EVENT)
- ironlake_handle_rps_change(dev);
+ ironlake_rps_change_irq_handler(dev);
if (IS_GEN6(dev) && pm_iir & GEN6_PM_RPS_EVENTS)
- gen6_queue_rps_work(dev_priv, pm_iir);
+ gen6_rps_irq_handler(dev_priv, pm_iir);
I915_WRITE(GTIIR, gt_iir);
I915_WRITE(DEIIR, de_iir);
--
1.8.5.rc3