drm/i915: Add low level set of routines for programming PM IER/IIR/IMR register set

So far PM IER/IIR/IMR registers were being used only for Turbo related
interrupts. But interrupts coming from GuC also use the same set.
As a precursor to supporting GuC interrupts, added new low level routines
so as to allow sharing the programming of PM IER/IIR/IMR registers between
Turbo & GuC.
Also similar to PM IMR, maintaining a bitmask for PM IER register, to allow
easy sharing of it between Turbo & GuC without involving a rmw operation.

v2:
- For appropriateness & avoid any ambiguity, rename old functions
  enable/disable pm_irq to mask/unmask pm_irq and rename new functions
  enable/disable pm_interrupts to enable/disable pm_irq. (Tvrtko)
- Use u32 in place of uint32_t. (Tvrtko)

v3:
- Rename the fields pm_irq_mask & pm_ier_mask and do some cleanup. (Chris)
- Rebase.

v4: Fix the inadvertent disabling of User interrupt for VECS ring causing
    failure for certain IGTs.

v5: Use dev_priv with HAS_VEBOX macro. (Tvrtko)

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Akash Goel <akash.goel@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index dd3acabb7edb38eeae90c7cd81b32b4345e49f17..58d332bda22716888825f5d79165b8fe8b886135 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1836,7 +1836,8 @@ struct drm_i915_private {
                u32 de_irq_mask[I915_MAX_PIPES];
        };
        u32 gt_irq_mask;
-       u32 pm_irq_mask;
+       u32 pm_imr;
+       u32 pm_ier;
        u32 pm_rps_events;
        u32 pipestat_irq_mask[I915_MAX_PIPES];
 

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 23315e5461bf6d0588b912f1f4a2db7df2d6e065..6412aac74346b9c21294acaaec02203979e6610a 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -303,18 +303,18 @@ static void snb_update_pm_irq(struct drm_i915_private *dev_priv,
 
        assert_spin_locked(&dev_priv->irq_lock);
 
-       new_val = dev_priv->pm_irq_mask;
+       new_val = dev_priv->pm_imr;
        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(gen6_pm_imr(dev_priv), dev_priv->pm_irq_mask);
+       if (new_val != dev_priv->pm_imr) {
+               dev_priv->pm_imr = new_val;
+               I915_WRITE(gen6_pm_imr(dev_priv), dev_priv->pm_imr);
                POSTING_READ(gen6_pm_imr(dev_priv));
        }
 }
 
-void gen6_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
+void gen6_unmask_pm_irq(struct drm_i915_private *dev_priv, u32 mask)
 {
        if (WARN_ON(!intel_irqs_enabled(dev_priv)))
                return;
@@ -322,28 +322,54 @@ void gen6_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
        snb_update_pm_irq(dev_priv, mask, mask);
 }
 
-static void __gen6_disable_pm_irq(struct drm_i915_private *dev_priv,
-                                 uint32_t mask)
+static void __gen6_mask_pm_irq(struct drm_i915_private *dev_priv, u32 mask)
 {
        snb_update_pm_irq(dev_priv, mask, 0);
 }
 
-void gen6_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
+void gen6_mask_pm_irq(struct drm_i915_private *dev_priv, u32 mask)
 {
        if (WARN_ON(!intel_irqs_enabled(dev_priv)))
                return;
 
-       __gen6_disable_pm_irq(dev_priv, mask);
+       __gen6_mask_pm_irq(dev_priv, mask);
 }
 
-void gen6_reset_rps_interrupts(struct drm_i915_private *dev_priv)
+void gen6_reset_pm_iir(struct drm_i915_private *dev_priv, u32 reset_mask)
 {
        i915_reg_t reg = gen6_pm_iir(dev_priv);
 
-       spin_lock_irq(&dev_priv->irq_lock);
-       I915_WRITE(reg, dev_priv->pm_rps_events);
-       I915_WRITE(reg, dev_priv->pm_rps_events);
+       assert_spin_locked(&dev_priv->irq_lock);
+
+       I915_WRITE(reg, reset_mask);
+       I915_WRITE(reg, reset_mask);
        POSTING_READ(reg);
+}
+
+void gen6_enable_pm_irq(struct drm_i915_private *dev_priv, u32 enable_mask)
+{
+       assert_spin_locked(&dev_priv->irq_lock);
+
+       dev_priv->pm_ier |= enable_mask;
+       I915_WRITE(gen6_pm_ier(dev_priv), dev_priv->pm_ier);
+       gen6_unmask_pm_irq(dev_priv, enable_mask);
+       /* unmask_pm_irq provides an implicit barrier (POSTING_READ) */
+}
+
+void gen6_disable_pm_irq(struct drm_i915_private *dev_priv, u32 disable_mask)
+{
+       assert_spin_locked(&dev_priv->irq_lock);
+
+       dev_priv->pm_ier &= ~disable_mask;
+       __gen6_mask_pm_irq(dev_priv, disable_mask);
+       I915_WRITE(gen6_pm_ier(dev_priv), dev_priv->pm_ier);
+       /* though a barrier is missing here, but don't really need a one */
+}
+
+void gen6_reset_rps_interrupts(struct drm_i915_private *dev_priv)
+{
+       spin_lock_irq(&dev_priv->irq_lock);
+       gen6_reset_pm_iir(dev_priv, dev_priv->pm_rps_events);
        dev_priv->rps.pm_iir = 0;
        spin_unlock_irq(&dev_priv->irq_lock);
 }
@@ -357,8 +383,6 @@ void gen6_enable_rps_interrupts(struct drm_i915_private *dev_priv)
        WARN_ON_ONCE(dev_priv->rps.pm_iir);
        WARN_ON_ONCE(I915_READ(gen6_pm_iir(dev_priv)) & dev_priv->pm_rps_events);
        dev_priv->rps.interrupts_enabled = true;
-       I915_WRITE(gen6_pm_ier(dev_priv), I915_READ(gen6_pm_ier(dev_priv)) |
-                               dev_priv->pm_rps_events);
        gen6_enable_pm_irq(dev_priv, dev_priv->pm_rps_events);
 
        spin_unlock_irq(&dev_priv->irq_lock);
@@ -379,9 +403,7 @@ void gen6_disable_rps_interrupts(struct drm_i915_private *dev_priv)
 
        I915_WRITE(GEN6_PMINTRMSK, gen6_sanitize_rps_pm_mask(dev_priv, ~0u));
 
-       __gen6_disable_pm_irq(dev_priv, dev_priv->pm_rps_events);
-       I915_WRITE(gen6_pm_ier(dev_priv), I915_READ(gen6_pm_ier(dev_priv)) &
-                               ~dev_priv->pm_rps_events);
+       gen6_disable_pm_irq(dev_priv, dev_priv->pm_rps_events);
 
        spin_unlock_irq(&dev_priv->irq_lock);
        synchronize_irq(dev_priv->drm.irq);
@@ -1085,7 +1107,7 @@ static void gen6_pm_rps_work(struct work_struct *work)
        pm_iir = dev_priv->rps.pm_iir;
        dev_priv->rps.pm_iir = 0;
        /* Make sure not to corrupt PMIMR state used by ringbuffer on GEN6 */
-       gen6_enable_pm_irq(dev_priv, dev_priv->pm_rps_events);
+       gen6_unmask_pm_irq(dev_priv, dev_priv->pm_rps_events);
        client_boost = dev_priv->rps.client_boost;
        dev_priv->rps.client_boost = false;
        spin_unlock_irq(&dev_priv->irq_lock);
@@ -1586,7 +1608,7 @@ static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir)
 {
        if (pm_iir & dev_priv->pm_rps_events) {
                spin_lock(&dev_priv->irq_lock);
-               gen6_disable_pm_irq(dev_priv, pm_iir & dev_priv->pm_rps_events);
+               gen6_mask_pm_irq(dev_priv, pm_iir & dev_priv->pm_rps_events);
                if (dev_priv->rps.interrupts_enabled) {
                        dev_priv->rps.pm_iir |= pm_iir & dev_priv->pm_rps_events;
                        schedule_work(&dev_priv->rps.work);
@@ -3545,11 +3567,13 @@ static void gen5_gt_irq_postinstall(struct drm_device *dev)
                 * RPS interrupts will get enabled/disabled on demand when RPS
                 * itself is enabled/disabled.
                 */
-               if (HAS_VEBOX(dev))
+               if (HAS_VEBOX(dev_priv)) {
                        pm_irqs |= PM_VEBOX_USER_INTERRUPT;
+                       dev_priv->pm_ier |= PM_VEBOX_USER_INTERRUPT;
+               }
 
-               dev_priv->pm_irq_mask = 0xffffffff;
-               GEN5_IRQ_INIT(GEN6_PM, dev_priv->pm_irq_mask, pm_irqs);
+               dev_priv->pm_imr = 0xffffffff;
+               GEN5_IRQ_INIT(GEN6_PM, dev_priv->pm_imr, pm_irqs);
        }
 }
 
@@ -3669,14 +3693,15 @@ static void gen8_gt_irq_postinstall(struct drm_i915_private *dev_priv)
        if (HAS_L3_DPF(dev_priv))
                gt_interrupts[0] |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
 
-       dev_priv->pm_irq_mask = 0xffffffff;
+       dev_priv->pm_ier = 0x0;
+       dev_priv->pm_imr = ~dev_priv->pm_ier;
        GEN8_IRQ_INIT_NDX(GT, 0, ~gt_interrupts[0], gt_interrupts[0]);
        GEN8_IRQ_INIT_NDX(GT, 1, ~gt_interrupts[1], gt_interrupts[1]);
        /*
         * RPS interrupts will get enabled/disabled on demand when RPS itself
         * is enabled/disabled.
         */
-       GEN8_IRQ_INIT_NDX(GT, 2, dev_priv->pm_irq_mask, 0);
+       GEN8_IRQ_INIT_NDX(GT, 2, dev_priv->pm_imr, dev_priv->pm_ier);
        GEN8_IRQ_INIT_NDX(GT, 3, ~gt_interrupts[3], gt_interrupts[3]);
 }
 

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 16b33f59dd6f0ce42fccadf3263dcb492bcb8077..07308eb2e240771601cae6e179b98bd05a2634b2 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1123,6 +1123,9 @@ void intel_check_pch_fifo_underruns(struct drm_i915_private *dev_priv);
 /* i915_irq.c */
 void gen5_enable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 void gen5_disable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask);
+void gen6_reset_pm_iir(struct drm_i915_private *dev_priv, u32 mask);
+void gen6_mask_pm_irq(struct drm_i915_private *dev_priv, u32 mask);
+void gen6_unmask_pm_irq(struct drm_i915_private *dev_priv, u32 mask);
 void gen6_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 void gen6_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 void gen6_reset_rps_interrupts(struct drm_i915_private *dev_priv);

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 32786ba199b91b71af5055f793748cebe98c782e..67a70c5e64534bb96f8bc4ad131e28cceee870dc 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1608,7 +1608,7 @@ hsw_vebox_irq_enable(struct intel_engine_cs *engine)
        struct drm_i915_private *dev_priv = engine->i915;
 
        I915_WRITE_IMR(engine, ~engine->irq_enable_mask);
-       gen6_enable_pm_irq(dev_priv, engine->irq_enable_mask);
+       gen6_unmask_pm_irq(dev_priv, engine->irq_enable_mask);
 }
 
 static void
@@ -1617,7 +1617,7 @@ hsw_vebox_irq_disable(struct intel_engine_cs *engine)
        struct drm_i915_private *dev_priv = engine->i915;
 
        I915_WRITE_IMR(engine, ~0);
-       gen6_disable_pm_irq(dev_priv, engine->irq_enable_mask);
+       gen6_mask_pm_irq(dev_priv, engine->irq_enable_mask);
 }
 
 static void