We only need a very lightweight mechanism here as the locking is only
used for co-ordinating a bitfield.
Also double check that the object is still pinned to the display plane
before processing the state change.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/intel_frontbuffer.c | 40 +++++++++++++++++---------------
3 files changed, 23 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 97372869097f..eeffefa10612 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1545,7 +1545,7 @@ struct intel_pipe_crc {
};
struct i915_frontbuffer_tracking {
- struct mutex lock;
+ spinlock_t lock;
/*
* Tracking bits for delayed frontbuffer flushing du to gpu activity or
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e9f2d2b102de..43baac2c1e20 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5260,7 +5260,7 @@ i915_gem_load(struct drm_device *dev)
i915_gem_shrinker_init(dev_priv);
- mutex_init(&dev_priv->fb_tracking.lock);
+ spin_lock_init(&dev_priv->fb_tracking.lock);
}
void i915_gem_release(struct drm_device *dev, struct drm_file *file)
diff --git a/drivers/gpu/drm/i915/intel_frontbuffer.c
b/drivers/gpu/drm/i915/intel_frontbuffer.c
index a20cffb78c0f..28ce2ab94189 100644
--- a/drivers/gpu/drm/i915/intel_frontbuffer.c
+++ b/drivers/gpu/drm/i915/intel_frontbuffer.c
@@ -139,16 +139,14 @@ void intel_fb_obj_invalidate(struct drm_i915_gem_object
*obj,
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
- if (!obj->frontbuffer_bits)
+ if (!obj->frontbuffer_bits || !obj->pin_display)
return;
if (ring) {
- mutex_lock(&dev_priv->fb_tracking.lock);
- dev_priv->fb_tracking.busy_bits
- |= obj->frontbuffer_bits;
- dev_priv->fb_tracking.flip_bits
- &= ~obj->frontbuffer_bits;
- mutex_unlock(&dev_priv->fb_tracking.lock);
+ spin_lock(&dev_priv->fb_tracking.lock);
+ dev_priv->fb_tracking.busy_bits |= obj->frontbuffer_bits;
+ dev_priv->fb_tracking.flip_bits &= ~obj->frontbuffer_bits;
+ spin_unlock(&dev_priv->fb_tracking.lock);
}
intel_mark_fb_busy(dev, obj->frontbuffer_bits, ring);
@@ -175,9 +173,12 @@ void intel_frontbuffer_flush(struct drm_device *dev,
struct drm_i915_private *dev_priv = dev->dev_private;
/* Delay flushing when rings are still busy.*/
- mutex_lock(&dev_priv->fb_tracking.lock);
+ spin_lock(&dev_priv->fb_tracking.lock);
frontbuffer_bits &= ~dev_priv->fb_tracking.busy_bits;
- mutex_unlock(&dev_priv->fb_tracking.lock);
+ spin_unlock(&dev_priv->fb_tracking.lock);
+
+ if (frontbuffer_bits == 0)
+ return;
intel_mark_fb_busy(dev, frontbuffer_bits, NULL);
@@ -204,21 +205,21 @@ void intel_fb_obj_flush(struct drm_i915_gem_object *obj,
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
- if (!obj->frontbuffer_bits)
+ if (!obj->frontbuffer_bits || !obj->pin_display)
return;
frontbuffer_bits = obj->frontbuffer_bits;
if (retire) {
- mutex_lock(&dev_priv->fb_tracking.lock);
+ spin_lock(&dev_priv->fb_tracking.lock);
/* Filter out new bits since rendering started. */
frontbuffer_bits &= dev_priv->fb_tracking.busy_bits;
-
dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits;
- mutex_unlock(&dev_priv->fb_tracking.lock);
+ spin_unlock(&dev_priv->fb_tracking.lock);
}
- intel_frontbuffer_flush(dev, frontbuffer_bits);
+ if (frontbuffer_bits)
+ intel_frontbuffer_flush(dev, frontbuffer_bits);
}
/**
@@ -238,11 +239,11 @@ void intel_frontbuffer_flip_prepare(struct drm_device
*dev,
{
struct drm_i915_private *dev_priv = dev->dev_private;
- mutex_lock(&dev_priv->fb_tracking.lock);
+ spin_lock(&dev_priv->fb_tracking.lock);
dev_priv->fb_tracking.flip_bits |= frontbuffer_bits;
/* Remove stale busy bits due to the old buffer. */
dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits;
- mutex_unlock(&dev_priv->fb_tracking.lock);
+ spin_unlock(&dev_priv->fb_tracking.lock);
}
/**
@@ -260,11 +261,12 @@ void intel_frontbuffer_flip_complete(struct drm_device
*dev,
{
struct drm_i915_private *dev_priv = dev->dev_private;
- mutex_lock(&dev_priv->fb_tracking.lock);
+ spin_lock(&dev_priv->fb_tracking.lock);
/* Mask any cancelled flips. */
frontbuffer_bits &= dev_priv->fb_tracking.flip_bits;
dev_priv->fb_tracking.flip_bits &= ~frontbuffer_bits;
- mutex_unlock(&dev_priv->fb_tracking.lock);
+ spin_unlock(&dev_priv->fb_tracking.lock);
- intel_frontbuffer_flush(dev, frontbuffer_bits);
+ if (frontbuffer_bits)
+ intel_frontbuffer_flush(dev, frontbuffer_bits);
}
--
2.1.4
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