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drm/i915: Drop fake breadcrumb irq

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Missed breadcrumb detection is defunct due to the tight coupling with
dma_fence signaling and the myriad ways we may signal fences from
everywhere but from an interrupt, i.e. we frequently signal a fence
before we even see its interrupt. This means that even if we miss an
interrupt for a fence, it still is signaled before our breadcrumb
hangcheck fires, so simplify the breadcrumb hangchecking by moving it
into the GPU hangcheck and forgo fake interrupts.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190129205230.19056-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-01-29 20:52:30 +00:00
parent 52c0fdb25c
commit 789659f430
7 changed files with 5 additions and 256 deletions
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93
drivers/gpu/drm/i915/i915_debugfs.c
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@@ -1321,9 +1321,6 @@ static int i915_hangcheck_info(struct seq_file *m, void *unused)
intel_engine_last_submit(engine),
jiffies_to_msecs(jiffies -
engine->hangcheck.action_timestamp));
seq_printf(m, "\tfake irq active? %s\n",
yesno(test_bit(engine->id,
&dev_priv->gpu_error.missed_irq_rings)));
seq_printf(m, "\tACTHD = 0x%08llx [current 0x%08llx]\n",
(long long)engine->hangcheck.acthd,
@@ -3899,94 +3896,6 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_wedged_fops,
i915_wedged_get, i915_wedged_set,
"%llu\n");
static int
fault_irq_set(struct drm_i915_private *i915,
unsigned long *irq,
unsigned long val)
{
int err;
err = mutex_lock_interruptible(&i915->drm.struct_mutex);
if (err)
return err;
err = i915_gem_wait_for_idle(i915,
I915_WAIT_LOCKED |
I915_WAIT_INTERRUPTIBLE,
MAX_SCHEDULE_TIMEOUT);
if (err)
goto err_unlock;
*irq = val;
mutex_unlock(&i915->drm.struct_mutex);
/* Flush idle worker to disarm irq */
drain_delayed_work(&i915->gt.idle_work);
return 0;
err_unlock:
mutex_unlock(&i915->drm.struct_mutex);
return err;
}
static int
i915_ring_missed_irq_get(void *data, u64 *val)
{
struct drm_i915_private *dev_priv = data;
*val = dev_priv->gpu_error.missed_irq_rings;
return 0;
}
static int
i915_ring_missed_irq_set(void *data, u64 val)
{
struct drm_i915_private *i915 = data;
return fault_irq_set(i915, &i915->gpu_error.missed_irq_rings, val);
}
DEFINE_SIMPLE_ATTRIBUTE(i915_ring_missed_irq_fops,
i915_ring_missed_irq_get, i915_ring_missed_irq_set,
"0x%08llx\n");
static int
i915_ring_test_irq_get(void *data, u64 *val)
{
struct drm_i915_private *dev_priv = data;
*val = dev_priv->gpu_error.test_irq_rings;
return 0;
}
static int
i915_ring_test_irq_set(void *data, u64 val)
{
struct drm_i915_private *i915 = data;
/* GuC keeps the user interrupt permanently enabled for submission */
if (USES_GUC_SUBMISSION(i915))
return -ENODEV;
/*
* From icl, we can no longer individually mask interrupt generation
* from each engine.
*/
if (INTEL_GEN(i915) >= 11)
return -ENODEV;
val &= INTEL_INFO(i915)->ring_mask;
DRM_DEBUG_DRIVER("Masking interrupts on rings 0x%08llx\n", val);
return fault_irq_set(i915, &i915->gpu_error.test_irq_rings, val);
}
DEFINE_SIMPLE_ATTRIBUTE(i915_ring_test_irq_fops,
i915_ring_test_irq_get, i915_ring_test_irq_set,
"0x%08llx\n");
#define DROP_UNBOUND BIT(0)
#define DROP_BOUND BIT(1)
#define DROP_RETIRE BIT(2)
@@ -4750,8 +4659,6 @@ static const struct i915_debugfs_files {
} i915_debugfs_files[] = {
{"i915_wedged", &i915_wedged_fops},
{"i915_cache_sharing", &i915_cache_sharing_fops},
{"i915_ring_missed_irq", &i915_ring_missed_irq_fops},
{"i915_ring_test_irq", &i915_ring_test_irq_fops},
{"i915_gem_drop_caches", &i915_drop_caches_fops},
#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
{"i915_error_state", &i915_error_state_fops},