[Intel-gfx] [PATCH 10/12] drm/i915/bdw: Implement a basic PM interrupt handler
Ben Widawsky
benjamin.widawsky at intel.com
Thu Mar 20 02:31:17 CET 2014
Almost all of it is reusable from the existing code. The primary
difference is we need to do even less in the interrupt handler, since
interrupts are not shared in the same way.
The patch is mostly a copy-paste of the existing snb+ code, with updates
to the relevant parts requiring changes to the interrupt handling. As
such it /should/ be relatively trivial. It's highly likely that I missed
some places where I need a gen8 version of the PM interrupts, but it has
become invisible to me by now.
This patch could probably be split into adding the new functions,
followed by actually handling the interrupts. Since the code is
currently disabled (and broken) I think the patch stands better by
itself.
v2: Move the commit about not touching the ringbuffer interrupt to the
snb_* function where it belongs (Rodrigo)
v3: Rebased on Paulo's runtime PM changes
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
drivers/gpu/drm/i915/i915_irq.c | 84 +++++++++++++++++++++++++++++++++++++---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_drv.h | 2 +
drivers/gpu/drm/i915/intel_pm.c | 39 ++++++++++++++++++-
4 files changed, 119 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 4b4aeb3..2f9ec6e 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -175,6 +175,7 @@ static void snb_update_pm_irq(struct drm_i915_private *dev_priv,
return;
}
+ /* Make sure not to corrupt PMIMR state used by ringbuffer code */
new_val = dev_priv->pm_irq_mask;
new_val &= ~interrupt_mask;
new_val |= (~enabled_irq_mask & interrupt_mask);
@@ -214,6 +215,53 @@ static bool ivb_can_enable_err_int(struct drm_device *dev)
return true;
}
+/**
+ * bdw_update_pm_irq - update GT interrupt 2
+ * @dev_priv: driver private
+ * @interrupt_mask: mask of interrupt bits to update
+ * @enabled_irq_mask: mask of interrupt bits to enable
+ *
+ * Copied from the snb function, updated with relevant register offsets
+ */
+static void bdw_update_pm_irq(struct drm_i915_private *dev_priv,
+ uint32_t interrupt_mask,
+ uint32_t enabled_irq_mask)
+{
+ uint32_t new_val;
+
+ assert_spin_locked(&dev_priv->irq_lock);
+
+ if (dev_priv->pm.irqs_disabled) {
+ WARN(1, "IRQs disabled\n");
+ dev_priv->pm.regsave.gen6_pmimr &= ~interrupt_mask;
+ dev_priv->pm.regsave.gen6_pmimr |= (~enabled_irq_mask &
+ interrupt_mask);
+ return;
+ }
+
+ new_val = dev_priv->pm_irq_mask;
+ new_val &= ~interrupt_mask;
+ new_val |= (~enabled_irq_mask & interrupt_mask);
+
+ if (new_val != dev_priv->pm_irq_mask) {
+ dev_priv->pm_irq_mask = new_val;
+ I915_WRITE(GEN8_GT_IMR(2), I915_READ(GEN8_GT_IMR(2)) |
+ dev_priv->pm_irq_mask);
+ POSTING_READ(GEN8_GT_IMR(2));
+ }
+}
+
+void bdw_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
+{
+ bdw_update_pm_irq(dev_priv, mask, mask);
+}
+
+void bdw_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
+{
+ bdw_update_pm_irq(dev_priv, mask, 0);
+}
+
+
static bool cpt_can_enable_serr_int(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1131,13 +1179,16 @@ static void gen6_pm_rps_work(struct work_struct *work)
spin_lock_irq(&dev_priv->irq_lock);
pm_iir = dev_priv->rps.pm_iir;
dev_priv->rps.pm_iir = 0;
- /* Make sure not to corrupt PMIMR state used by ringbuffer code */
- snb_enable_pm_irq(dev_priv, GEN6_PM_RPS_EVENTS);
+ if (IS_BROADWELL(dev_priv->dev))
+ bdw_enable_pm_irq(dev_priv, GEN6_PM_RPS_EVENTS);
+ else {
+ snb_enable_pm_irq(dev_priv, GEN6_PM_RPS_EVENTS);
+ /* Make sure we didn't queue anything we're not going to
+ * process. */
+ WARN_ON(pm_iir & ~GEN6_PM_RPS_EVENTS);
+ }
spin_unlock_irq(&dev_priv->irq_lock);
- /* Make sure we didn't queue anything we're not going to process. */
- WARN_ON(pm_iir & ~GEN6_PM_RPS_EVENTS);
-
if ((pm_iir & GEN6_PM_RPS_EVENTS) == 0)
return;
@@ -1330,6 +1381,19 @@ static void snb_gt_irq_handler(struct drm_device *dev,
ivybridge_parity_error_irq_handler(dev, gt_iir);
}
+static void gen8_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir)
+{
+ if ((pm_iir & GEN6_PM_RPS_EVENTS) == 0)
+ return;
+
+ spin_lock(&dev_priv->irq_lock);
+ dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS;
+ bdw_disable_pm_irq(dev_priv, pm_iir & GEN6_PM_RPS_EVENTS);
+ spin_unlock(&dev_priv->irq_lock);
+
+ queue_work(dev_priv->wq, &dev_priv->rps.work);
+}
+
static irqreturn_t gen8_gt_irq_handler(struct drm_device *dev,
struct drm_i915_private *dev_priv,
u32 master_ctl)
@@ -1365,6 +1429,16 @@ static irqreturn_t gen8_gt_irq_handler(struct drm_device *dev,
DRM_ERROR("The master control interrupt lied (GT1)!\n");
}
+ if (master_ctl & GEN8_GT_PM_IRQ) {
+ tmp = I915_READ(GEN8_GT_IIR(2));
+ if (tmp & GEN6_PM_RPS_EVENTS) {
+ ret = IRQ_HANDLED;
+ gen8_rps_irq_handler(dev_priv, tmp);
+ I915_WRITE(GEN8_GT_IIR(1), tmp & GEN6_PM_RPS_EVENTS);
+ } else
+ DRM_ERROR("The master control interrupt lied (PM)!\n");
+ }
+
if (master_ctl & GEN8_GT_VECS_IRQ) {
tmp = I915_READ(GEN8_GT_IIR(3));
if (tmp) {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 6174fda..67952c7 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4086,6 +4086,7 @@ enum punit_power_well {
#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_PM_IRQ (1<<4)
#define GEN8_GT_VCS2_IRQ (1<<3)
#define GEN8_GT_VCS1_IRQ (1<<2)
#define GEN8_GT_BCS_IRQ (1<<1)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 60ffad3..fde5df7 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -623,6 +623,8 @@ void snb_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
void snb_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
void hsw_runtime_pm_disable_interrupts(struct drm_device *dev);
void hsw_runtime_pm_restore_interrupts(struct drm_device *dev);
+void bdw_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
+void bdw_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
/* intel_crt.c */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9486396..38e4d60 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3155,6 +3155,25 @@ void valleyview_set_rps(struct drm_device *dev, u8 val)
trace_intel_gpu_freq_change(vlv_gpu_freq(dev_priv, val));
}
+static void gen8_disable_rps_interrupts(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
+ I915_WRITE(GEN8_GT_IER(2), I915_READ(GEN8_GT_IER(2)) &
+ ~GEN6_PM_RPS_EVENTS);
+ /* Complete PM interrupt masking here doesn't race with the rps work
+ * item again unmasking PM interrupts because that is using a different
+ * register (PMIMR) to mask PM interrupts. The only risk is in leaving
+ * stale bits in PMIIR and PMIMR which gen6_enable_rps will clean up. */
+
+ spin_lock_irq(&dev_priv->irq_lock);
+ dev_priv->rps.pm_iir = 0;
+ spin_unlock_irq(&dev_priv->irq_lock);
+
+ I915_WRITE(GEN8_GT_IIR(2), GEN6_PM_RPS_EVENTS);
+}
+
static void gen6_disable_rps_interrupts(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -3180,7 +3199,10 @@ static void gen6_disable_rps(struct drm_device *dev)
I915_WRITE(GEN6_RC_CONTROL, 0);
I915_WRITE(GEN6_RPNSWREQ, 1 << 31);
- gen6_disable_rps_interrupts(dev);
+ if (IS_BROADWELL(dev))
+ gen8_disable_rps_interrupts(dev);
+ else
+ gen6_disable_rps_interrupts(dev);
}
static void valleyview_disable_rps(struct drm_device *dev)
@@ -3225,6 +3247,19 @@ int intel_enable_rc6(const struct drm_device *dev)
return INTEL_RC6_ENABLE;
}
+static void gen8_enable_rps_interrupts(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ spin_lock_irq(&dev_priv->irq_lock);
+ WARN_ON(dev_priv->rps.pm_iir);
+ bdw_enable_pm_irq(dev_priv, GEN6_PM_RPS_EVENTS);
+ I915_WRITE(GEN8_GT_IIR(2), GEN6_PM_RPS_EVENTS);
+ spin_unlock_irq(&dev_priv->irq_lock);
+
+ I915_WRITE(GEN6_PMINTRMSK, ~GEN6_PM_RPS_EVENTS);
+}
+
static void gen6_enable_rps_interrupts(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -3339,7 +3374,7 @@ static void gen8_enable_rps(struct drm_device *dev)
gen6_set_rps(dev, (I915_READ(GEN6_GT_PERF_STATUS) & 0xff00) >> 8);
- gen6_enable_rps_interrupts(dev);
+ gen8_enable_rps_interrupts(dev);
gen6_gt_force_wake_put(dev_priv, FORCEWAKE_ALL);
}
--
1.9.0
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