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drm/i915: Defer unmasking RPS interrupts until after making adjustments 

To make our adjustments to RPS requires taking a mutex and potentially
sleeping for an unknown duration - until we have completed our
adjustments further RPS interrupts are immaterial (they are based on
stale thresholds) and we can safely ignore them.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170309211232.28878-3-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-03-09 21:12:32 +00:00
parent 569884e3d4
commit 7c0a16ad7c
1 changed files with 13 additions and 15 deletions
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28
drivers/gpu/drm/i915/i915_irq.c
View File

@ -1148,30 +1148,21 @@ static void gen6_pm_rps_work(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
container_of(work, struct drm_i915_private, rps.work);
bool client_boost;
bool client_boost = false;
int new_delay, adj, min, max;
u32 pm_iir;
u32 pm_iir = 0;
spin_lock_irq(&dev_priv->irq_lock);
/* Speed up work cancelation during disabling rps interrupts. */
if (!dev_priv->rps.interrupts_enabled) {
spin_unlock_irq(&dev_priv->irq_lock);
return;
if (dev_priv->rps.interrupts_enabled) {
pm_iir = fetch_and_zero(&dev_priv->rps.pm_iir);
client_boost = fetch_and_zero(&dev_priv->rps.client_boost);
}
pm_iir = dev_priv->rps.pm_iir;
dev_priv->rps.pm_iir = 0;
/* Make sure not to corrupt PMIMR state used by ringbuffer on GEN6 */
gen6_unmask_pm_irq(dev_priv, dev_priv->pm_rps_events);
client_boost = dev_priv->rps.client_boost;
dev_priv->rps.client_boost = false;
spin_unlock_irq(&dev_priv->irq_lock);
/* Make sure we didn't queue anything we're not going to process. */
WARN_ON(pm_iir & ~dev_priv->pm_rps_events);
if ((pm_iir & dev_priv->pm_rps_events) == 0 && !client_boost)
return;
goto out;
mutex_lock(&dev_priv->rps.hw_lock);
@ -1228,6 +1219,13 @@ static void gen6_pm_rps_work(struct work_struct *work)
}
mutex_unlock(&dev_priv->rps.hw_lock);
out:
/* Make sure not to corrupt PMIMR state used by ringbuffer on GEN6 */
spin_lock_irq(&dev_priv->irq_lock);
if (dev_priv->rps.interrupts_enabled)
gen6_unmask_pm_irq(dev_priv, dev_priv->pm_rps_events);
spin_unlock_irq(&dev_priv->irq_lock);
}