[PATCH 01/21] drm/i915: Optimize pipe irq handling on bdw

Ben Widawsky
2013-11-08T06:09:13Z

From: Daniel Vetter <daniel.vetter@ffwll.ch>

We have a per-pipe bit in the master irq control register, so use it.
This allows us to drop the masks for aggregate interrupt bits and be a
bit more explicit in the code. It also removes one indentation level.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/i915/i915_irq.c | 40 +++++++++++++++++++---------------------
drivers/gpu/drm/i915/i915_reg.h | 5 +----
2 files changed, 20 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 54338cf..c04fbbf 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1749,6 +1749,7 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
u32 master_ctl;
irqreturn_t ret = IRQ_NONE;
uint32_t tmp = 0;
+ enum pipe pipe;

atomic_inc(&dev_priv->irq_received);

@@ -1777,31 +1778,28 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
}
}

- if (master_ctl & GEN8_DE_IRQS) {
- int de_ret = 0;
- int pipe;
- for_each_pipe(pipe) {
- uint32_t pipe_iir;
-
- pipe_iir = I915_READ(GEN8_DE_PIPE_IIR(pipe));
- if (pipe_iir & GEN8_PIPE_VBLANK)
- drm_handle_vblank(dev, pipe);
+ for_each_pipe(pipe) {
+ uint32_t pipe_iir;

- if (pipe_iir & GEN8_PIPE_FLIP_DONE) {
- intel_prepare_page_flip(dev, pipe);
- intel_finish_page_flip_plane(dev, pipe);
- }
+ if (!(master_ctl & GEN8_DE_PIPE_IRQ(pipe)))
+ continue;

- if (pipe_iir & GEN8_DE_PIPE_IRQ_ERRORS)
- DRM_ERROR("Errors on pipe %c\n", 'A' + pipe);
+ pipe_iir = I915_READ(GEN8_DE_PIPE_IIR(pipe));
+ if (pipe_iir & GEN8_PIPE_VBLANK)
+ drm_handle_vblank(dev, pipe);

- if (pipe_iir) {
- de_ret++;
- ret = IRQ_HANDLED;
- I915_WRITE(GEN8_DE_PIPE_IIR(pipe), pipe_iir);
- }
+ if (pipe_iir & GEN8_PIPE_FLIP_DONE) {
+ intel_prepare_page_flip(dev, pipe);
+ intel_finish_page_flip_plane(dev, pipe);
}
- if (!de_ret)
+
+ if (pipe_iir & GEN8_DE_PIPE_IRQ_ERRORS)
+ DRM_ERROR("Errors on pipe %c\n", 'A' + pipe);
+
+ if (pipe_iir) {
+ ret = IRQ_HANDLED;
+ I915_WRITE(GEN8_DE_PIPE_IIR(pipe), pipe_iir);
+ } else
DRM_ERROR("The master control interrupt lied (DE PIPE)!\n");
}

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2b9e66c..f150eda 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4031,15 +4031,12 @@
#define GEN8_DE_PIPE_C_IRQ (1<<18)
#define GEN8_DE_PIPE_B_IRQ (1<<17)
#define GEN8_DE_PIPE_A_IRQ (1<<16)
+#define GEN8_DE_PIPE_IRQ(pipe) (1<<(16+pipe))
#define GEN8_GT_VECS_IRQ (1<<6)
#define GEN8_GT_VCS2_IRQ (1<<3)
#define GEN8_GT_VCS1_IRQ (1<<2)
#define GEN8_GT_BCS_IRQ (1<<1)
#define GEN8_GT_RCS_IRQ (1<<0)
-/* Lazy definition */
-#define GEN8_GT_IRQS 0x000000ff
-#define GEN8_DE_IRQS 0x01ff0000
-#define GEN8_RSVD_IRQS 0xB700ff00

#define GEN8_GT_ISR(which) (0x44300 + (0x10 * (which)))
#define GEN8_GT_IMR(which) (0x44304 + (0x10 * (which)))
--
1.8.4.2