drm/i915: Reset the breadcrumbs IRQ more carefully

Along with the interrupt, we want to restore the fake-irq and
wait-timeout detection. If we use the breadcrumbs interface to setup the
interrupt as it wants, the auxiliary timers will also be restored.

v2: Cancel both timers as well, sanitize the IMR.

Fixes: 821ed7df6e2a ("drm/i915: Update reset path to fix incomplete requests")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161007065327.24515-3-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 9bad14d22c95729023374ad860931348a5de07d5..495611b7068dc42bf2cbddfb3c86e4711d4badab 100644 (file)
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -578,6 +578,36 @@ int intel_engine_init_breadcrumbs(struct intel_engine_cs *engine)
        return 0;
 }
 
+static void cancel_fake_irq(struct intel_engine_cs *engine)
+{
+       struct intel_breadcrumbs *b = &engine->breadcrumbs;
+
+       del_timer_sync(&b->hangcheck);
+       del_timer_sync(&b->fake_irq);
+       clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
+}
+
+void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
+{
+       struct intel_breadcrumbs *b = &engine->breadcrumbs;
+
+       cancel_fake_irq(engine);
+       spin_lock(&b->lock);
+
+       __intel_breadcrumbs_disable_irq(b);
+       if (intel_engine_has_waiter(engine)) {
+               b->timeout = wait_timeout();
+               __intel_breadcrumbs_enable_irq(b);
+               if (READ_ONCE(b->irq_posted))
+                       wake_up_process(b->first_wait->tsk);
+       } else {
+               /* sanitize the IMR and unmask any auxiliary interrupts */
+               irq_disable(engine);
+       }
+
+       spin_unlock(&b->lock);
+}
+
 void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine)
 {
        struct intel_breadcrumbs *b = &engine->breadcrumbs;
@@ -585,8 +615,7 @@ void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine)
        if (!IS_ERR_OR_NULL(b->signaler))
                kthread_stop(b->signaler);
 
-       del_timer_sync(&b->hangcheck);
-       del_timer_sync(&b->fake_irq);
+       cancel_fake_irq(engine);
 }
 
 unsigned int intel_kick_waiters(struct drm_i915_private *i915)

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index d00ec805f93db6543748a356d5ececc1fce5a6bd..480584c09306d74116b08aa6c95435d0b5e6c035 100644 (file)
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -210,9 +210,6 @@ void intel_engine_init_seqno(struct intel_engine_cs *engine, u32 seqno)
 void intel_engine_init_hangcheck(struct intel_engine_cs *engine)
 {
        memset(&engine->hangcheck, 0, sizeof(engine->hangcheck));
-       clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
-       if (intel_engine_has_waiter(engine))
-               i915_queue_hangcheck(engine->i915);
 }
 
 static void intel_engine_init_requests(struct intel_engine_cs *engine)
@@ -307,18 +304,6 @@ int intel_engine_init_common(struct intel_engine_cs *engine)
        return 0;
 }
 
-void intel_engine_reset_irq(struct intel_engine_cs *engine)
-{
-       struct drm_i915_private *dev_priv = engine->i915;
-
-       spin_lock_irq(&dev_priv->irq_lock);
-       if (intel_engine_has_waiter(engine))
-               engine->irq_enable(engine);
-       else
-               engine->irq_disable(engine);
-       spin_unlock_irq(&dev_priv->irq_lock);
-}
-
 /**
  * intel_engines_cleanup_common - cleans up the engine state created by
  *                                the common initiailizers.

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 936f6f63f626954ea19a2c79db2d49b0ca4e6ce5..44904e298bfc8e5f76e11ccbe8bf702d980e8864 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1230,7 +1230,7 @@ static int gen8_init_common_ring(struct intel_engine_cs *engine)
 
        lrc_init_hws(engine);
 
-       intel_engine_reset_irq(engine);
+       intel_engine_reset_breadcrumbs(engine);
 
        I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff);
 

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 35f359e38f4dc51c24720e976a7a99a7769f851d..729f373782e2c86df22a3e5066b93f852c3f1f30 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -548,7 +548,7 @@ static int init_ring_common(struct intel_engine_cs *engine)
        else
                intel_ring_setup_status_page(engine);
 
-       intel_engine_reset_irq(engine);
+       intel_engine_reset_breadcrumbs(engine);
 
        /* Enforce ordering by reading HEAD register back */
        I915_READ_HEAD(engine);

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 34954ca03a4a17468f657df467f051d39b98cd86..124f4646958da9d670b6cde384c6a305ac53f963 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -520,7 +520,6 @@ int __intel_ring_space(int head, int tail, int size);
 void intel_ring_update_space(struct intel_ring *ring);
 
 void intel_engine_init_seqno(struct intel_engine_cs *engine, u32 seqno);
-void intel_engine_reset_irq(struct intel_engine_cs *engine);
 
 void intel_engine_setup_common(struct intel_engine_cs *engine);
 int intel_engine_init_common(struct intel_engine_cs *engine);
@@ -614,6 +613,7 @@ static inline bool intel_engine_wakeup(const struct intel_engine_cs *engine)
        return wakeup;
 }
 
+void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine);
 void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine);
 unsigned int intel_kick_waiters(struct drm_i915_private *i915);
 unsigned int intel_kick_signalers(struct drm_i915_private *i915);