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drm/i915: Mask USER interrupts on gen6 (until required)

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Otherwise we may consume 20% of the CPU just handling IRQs whilst
rendering. Ouch.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
2011-01-04 17:35:21 +00:00
parent b72f3acb71
commit 0f46832fab
5 changed files with 113 additions and 62 deletions
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120
drivers/gpu/drm/i915/intel_ringbuffer.c
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@@ -485,6 +485,38 @@ pc_render_get_seqno(struct intel_ring_buffer *ring)
return pc->cpu_page[0];
}
static void
ironlake_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
{
dev_priv->gt_irq_mask &= ~mask;
I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
POSTING_READ(GTIMR);
}
static void
ironlake_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
{
dev_priv->gt_irq_mask |= mask;
I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
POSTING_READ(GTIMR);
}
static void
i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
{
dev_priv->irq_mask &= ~mask;
I915_WRITE(IMR, dev_priv->irq_mask);
POSTING_READ(IMR);
}
static void
i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
{
dev_priv->irq_mask |= mask;
I915_WRITE(IMR, dev_priv->irq_mask);
POSTING_READ(IMR);
}
static bool
render_ring_get_irq(struct intel_ring_buffer *ring)
{
@@ -499,8 +531,8 @@ render_ring_get_irq(struct intel_ring_buffer *ring)
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
if (HAS_PCH_SPLIT(dev))
ironlake_enable_graphics_irq(dev_priv,
GT_PIPE_NOTIFY | GT_USER_INTERRUPT);
ironlake_enable_irq(dev_priv,
GT_PIPE_NOTIFY | GT_USER_INTERRUPT);
else
i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
@@ -520,9 +552,9 @@ render_ring_put_irq(struct intel_ring_buffer *ring)
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
if (HAS_PCH_SPLIT(dev))
ironlake_disable_graphics_irq(dev_priv,
GT_USER_INTERRUPT |
GT_PIPE_NOTIFY);
ironlake_disable_irq(dev_priv,
GT_USER_INTERRUPT |
GT_PIPE_NOTIFY);
else
i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
@@ -596,7 +628,7 @@ ring_get_irq(struct intel_ring_buffer *ring, u32 flag)
unsigned long irqflags;
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
ironlake_enable_graphics_irq(dev_priv, flag);
ironlake_enable_irq(dev_priv, flag);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}
@@ -613,7 +645,46 @@ ring_put_irq(struct intel_ring_buffer *ring, u32 flag)
unsigned long irqflags;
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
ironlake_disable_graphics_irq(dev_priv, flag);
ironlake_disable_irq(dev_priv, flag);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}
}
static bool
gen6_ring_get_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
{
struct drm_device *dev = ring->dev;
if (!dev->irq_enabled)
return false;
if (atomic_inc_return(&ring->irq_refcount) == 1) {
drm_i915_private_t *dev_priv = dev->dev_private;
unsigned long irqflags;
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
ring->irq_mask &= ~rflag;
I915_WRITE_IMR(ring, ring->irq_mask);
ironlake_enable_irq(dev_priv, gflag);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}
return true;
}
static void
gen6_ring_put_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
{
struct drm_device *dev = ring->dev;
if (atomic_dec_and_test(&ring->irq_refcount)) {
drm_i915_private_t *dev_priv = dev->dev_private;
unsigned long irqflags;
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
ring->irq_mask |= rflag;
I915_WRITE_IMR(ring, ring->irq_mask);
ironlake_disable_irq(dev_priv, gflag);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}
}
@@ -757,6 +828,7 @@ int intel_init_ring_buffer(struct drm_device *dev,
INIT_LIST_HEAD(&ring->active_list);
INIT_LIST_HEAD(&ring->request_list);
INIT_LIST_HEAD(&ring->gpu_write_list);
ring->irq_mask = ~0;
if (I915_NEED_GFX_HWS(dev)) {
ret = init_status_page(ring);
@@ -1029,16 +1101,36 @@ gen6_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,
return 0;
}
static bool
gen6_render_ring_get_irq(struct intel_ring_buffer *ring)
{
return gen6_ring_get_irq(ring,
GT_USER_INTERRUPT,
GEN6_RENDER_USER_INTERRUPT);
}
static void
gen6_render_ring_put_irq(struct intel_ring_buffer *ring)
{
return gen6_ring_put_irq(ring,
GT_USER_INTERRUPT,
GEN6_RENDER_USER_INTERRUPT);
}
static bool
gen6_bsd_ring_get_irq(struct intel_ring_buffer *ring)
{
return ring_get_irq(ring, GT_GEN6_BSD_USER_INTERRUPT);
return gen6_ring_get_irq(ring,
GT_GEN6_BSD_USER_INTERRUPT,
GEN6_BSD_USER_INTERRUPT);
}
static void
gen6_bsd_ring_put_irq(struct intel_ring_buffer *ring)
{
ring_put_irq(ring, GT_GEN6_BSD_USER_INTERRUPT);
return gen6_ring_put_irq(ring,
GT_GEN6_BSD_USER_INTERRUPT,
GEN6_BSD_USER_INTERRUPT);
}
/* ring buffer for Video Codec for Gen6+ */
@@ -1062,13 +1154,17 @@ static const struct intel_ring_buffer gen6_bsd_ring = {
static bool
blt_ring_get_irq(struct intel_ring_buffer *ring)
{
return ring_get_irq(ring, GT_BLT_USER_INTERRUPT);
return gen6_ring_get_irq(ring,
GT_BLT_USER_INTERRUPT,
GEN6_BLITTER_USER_INTERRUPT);
}
static void
blt_ring_put_irq(struct intel_ring_buffer *ring)
{
ring_put_irq(ring, GT_BLT_USER_INTERRUPT);
gen6_ring_put_irq(ring,
GT_BLT_USER_INTERRUPT,
GEN6_BLITTER_USER_INTERRUPT);
}
@@ -1192,6 +1288,8 @@ int intel_init_render_ring_buffer(struct drm_device *dev)
*ring = render_ring;
if (INTEL_INFO(dev)->gen >= 6) {
ring->add_request = gen6_add_request;
ring->irq_get = gen6_render_ring_get_irq;
ring->irq_put = gen6_render_ring_put_irq;
} else if (IS_GEN5(dev)) {
ring->add_request = pc_render_add_request;
ring->get_seqno = pc_render_get_seqno;