We only need a very lightweight mechanism here as the locking is only
used for co-ordinating a bitfield.
v2: Move the cheap unlikely tests into the caller
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/intel_drv.h | 29 ++++++++++++++---
drivers/gpu/drm/i915/intel_frontbuffer.c | 54 ++++++++++++++------------------
4 files changed, 51 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 3a68e604ad10..a24d31e3e014 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1669,7 +1669,7 @@ 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 1fb958dcc749..7db0808f6961 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4447,7 +4447,7 @@ i915_gem_load_init(struct drm_device *dev)
dev_priv->mm.interruptible = true;
- mutex_init(&dev_priv->fb_tracking.lock);
+ spin_lock_init(&dev_priv->fb_tracking.lock);
}
void i915_gem_load_cleanup(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e74d851868c5..01056ce8d461 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1135,8 +1135,6 @@ void intel_ddi_set_vc_payload_alloc(struct drm_crtc *crtc, bool state);
uint32_t ddi_signal_levels(struct intel_dp *intel_dp);
/* intel_frontbuffer.c */
-void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
- enum fb_op_origin origin);
void intel_frontbuffer_flip_prepare(struct drm_device *dev,
unsigned frontbuffer_bits);
void intel_frontbuffer_flip_complete(struct drm_device *dev,
@@ -1147,8 +1145,31 @@ unsigned int intel_fb_align_height(struct drm_device *dev,
unsigned int height,
uint32_t pixel_format,
uint64_t fb_format_modifier);
-void intel_fb_obj_flush(struct drm_i915_gem_object *obj, bool retire,
- enum fb_op_origin origin);
+
+void __intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
+ enum fb_op_origin origin);
+static inline void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
+ enum fb_op_origin origin)
+{
+ if (!obj->frontbuffer_bits)
+ return;
+
+ __intel_fb_obj_invalidate(obj, origin);
+}
+
+void __intel_fb_obj_flush(struct drm_i915_gem_object *obj,
+ bool retire,
+ enum fb_op_origin origin);
+static inline void intel_fb_obj_flush(struct drm_i915_gem_object *obj,
+ bool retire,
+ enum fb_op_origin origin)
+{
+ if (!obj->frontbuffer_bits)
+ return;
+
+ __intel_fb_obj_flush(obj, retire, origin);
+}
+
u32 intel_fb_stride_alignment(const struct drm_i915_private *dev_priv,
uint64_t fb_modifier, uint32_t pixel_format);
diff --git a/drivers/gpu/drm/i915/intel_frontbuffer.c b/drivers/gpu/drm/i915/intel_frontbuffer.c
index ac85357010b4..a38ccfe4894a 100644
--- a/drivers/gpu/drm/i915/intel_frontbuffer.c
+++ b/drivers/gpu/drm/i915/intel_frontbuffer.c
@@ -76,24 +76,19 @@
* until the rendering completes or a flip on this frontbuffer plane is
* scheduled.
*/
-void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
- enum fb_op_origin origin)
+void __intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
+ enum fb_op_origin origin)
{
struct drm_device *dev = obj->base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
- if (!obj->frontbuffer_bits)
- return;
-
if (origin == ORIGIN_CS) {
- 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_psr_invalidate(dev, obj->frontbuffer_bits);
@@ -120,11 +115,11 @@ static void intel_frontbuffer_flush(struct drm_device *dev,
struct drm_i915_private *dev_priv = to_i915(dev);
/* 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)
+ if (frontbuffer_bits == 0)
return;
intel_edp_drrs_flush(dev, frontbuffer_bits);
@@ -142,8 +137,9 @@ static void intel_frontbuffer_flush(struct drm_device *dev,
* completed and frontbuffer caching can be started again. If @retire is true
* then any delayed flushes will be unblocked.
*/
-void intel_fb_obj_flush(struct drm_i915_gem_object *obj,
- bool retire, enum fb_op_origin origin)
+void __intel_fb_obj_flush(struct drm_i915_gem_object *obj,
+ bool retire,
+ enum fb_op_origin origin)
{
struct drm_device *dev = obj->base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
@@ -151,21 +147,18 @@ void intel_fb_obj_flush(struct drm_i915_gem_object *obj,
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
- if (!obj->frontbuffer_bits)
- 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, origin);
+ if (frontbuffer_bits)
+ intel_frontbuffer_flush(dev, frontbuffer_bits, origin);
}
/**
@@ -185,11 +178,11 @@ void intel_frontbuffer_flip_prepare(struct drm_device *dev,
{
struct drm_i915_private *dev_priv = to_i915(dev);
- 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);
intel_psr_single_frame_update(dev, frontbuffer_bits);
}
@@ -209,13 +202,14 @@ void intel_frontbuffer_flip_complete(struct drm_device *dev,
{
struct drm_i915_private *dev_priv = to_i915(dev);
- 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, ORIGIN_FLIP);
+ if (frontbuffer_bits)
+ intel_frontbuffer_flush(dev, frontbuffer_bits, ORIGIN_FLIP);
}
/**
@@ -234,10 +228,10 @@ void intel_frontbuffer_flip(struct drm_device *dev,
{
struct drm_i915_private *dev_priv = to_i915(dev);
- mutex_lock(&dev_priv->fb_tracking.lock);
+ spin_lock(&dev_priv->fb_tracking.lock);
/* 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);
intel_frontbuffer_flush(dev, frontbuffer_bits, ORIGIN_FLIP);
}
--
2.8.1
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