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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: 821ed7df6e ("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
hifive-unleashed-5.1
Chris Wilson 2016-10-07 07:53:26 +01:00
parent d7f7633557
commit ad07dfcddf
5 changed files with 34 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/gpu/drm/i915/intel_breadcrumbs.c
View File

@ -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)

15
drivers/gpu/drm/i915/intel_engine_cs.c
View File

@ -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.

2
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -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);

2
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -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);

2
drivers/gpu/drm/i915/intel_ringbuffer.h
View File

@ -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);