[PATCH 14/18] drm/i915: vebox interrupt get/put

Ben Widawsky
2012-11-06T16:26:58Z

v2: Use the correct lock to protect PM interrupt regs, this was
accidentally lost from earlier (Haihao)
Fix return types (Ben)

CC: Xiang, Haihao <haihao.xiang@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
drivers/gpu/drm/i915/intel_ringbuffer.c | 46 +++++++++++++++++++++++++++++++--
drivers/gpu/drm/i915/intel_ringbuffer.h | 5 ++--
2 files changed, 47 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 33b176a..5f03abc 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -970,6 +970,48 @@ gen6_ring_put_irq(struct intel_ring_buffer *ring)
gen6_gt_force_wake_put(dev_priv);
}

+static bool
+hsw_vebox_get_irq(struct intel_ring_buffer *ring)
+{
+ struct drm_device *dev = ring->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ unsigned long flags;
+
+ if (!dev->irq_enabled)
+ return false;
+
+ spin_lock_irqsave(&dev_priv->rps.lock, flags);
+ if (ring->irq_refcount.pm++ == 0) {
+ u32 pm_imr = I915_READ(GEN6_PMIMR);
+ I915_WRITE_IMR(ring, ~ring->irq_enable_mask);
+ I915_WRITE(GEN6_PMIMR, pm_imr & ~ring->irq_enable_mask);
+ POSTING_READ(GEN6_PMIMR);
+ }
+ spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
+
+ return true;
+}
+
+static void
+hsw_vebox_put_irq(struct intel_ring_buffer *ring)
+{
+ struct drm_device *dev = ring->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ unsigned long flags;
+
+ if (!dev->irq_enabled)
+ return;
+
+ spin_lock_irqsave(&dev_priv->rps.lock, flags);
+ if (--ring->irq_refcount.pm == 0) {
+ u32 pm_imr = I915_READ(GEN6_PMIMR);
+ I915_WRITE_IMR(ring, ~0);
+ I915_WRITE(GEN6_PMIMR, pm_imr | ring->irq_enable_mask);
+ POSTING_READ(GEN6_PMIMR);
+ }
+ spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
+}
+
static int
i965_dispatch_execbuffer(struct intel_ring_buffer *ring,
u32 offset, u32 length,
@@ -1725,8 +1767,8 @@ int intel_init_vebox_ring_buffer(struct drm_device *dev)
ring->add_request = gen6_add_request;
ring->get_seqno = gen6_ring_get_seqno;
ring->irq_enable_mask = 0;
- ring->irq_get = NULL;
- ring->irq_put = NULL;
+ ring->irq_get = hsw_vebox_get_irq;
+ ring->irq_put = hsw_vebox_put_irq;
ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
ring->sync_to = gen6_ring_sync;
ring->semaphore_register[RCS] = MI_SEMAPHORE_SYNC_VER;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index b2fe5b4..2a2bd20 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -58,8 +58,9 @@ struct intel_ring_buffer {
u32 last_retired_head;

struct {
- u32 gt;
- } irq_refcount; /* protected by dev_priv->irq_lock */
+ u32 gt; /* protected by dev_priv->irq_lock */
+ u32 pm; /* protected by dev_priv->rps.lock (sucks) */
+ } irq_refcount;
u32 irq_enable_mask; /* bitmask to enable ring interrupt */
u32 trace_irq_seqno;
u32 sync_seqno[I915_NUM_RINGS-1];
--
1.8.0