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drm/i915: Serialise concurrent calls to i915_gem_set_wedged()

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Make i915_gem_set_wedged() and i915_gem_unset_wedged() behaviour more
consistent if called concurrently, and only do the wedging and reporting
once, curtailing any possible race where we start unwedging in the middle
of a wedge.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190114210408.4561-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-01-14 21:04:01 +00:00
parent 204474a6b8
commit 18bb2bccb5
3 changed files with 29 additions and 10 deletions
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34
drivers/gpu/drm/i915/i915_gem.c
View File

@ -3187,10 +3187,15 @@ static void nop_submit_request(struct i915_request *request)
void i915_gem_set_wedged(struct drm_i915_private *i915)
{
struct i915_gpu_error *error = &i915->gpu_error;
struct intel_engine_cs *engine;
enum intel_engine_id id;
GEM_TRACE("start\n");
mutex_lock(&error->wedge_mutex);
if (test_bit(I915_WEDGED, &error->flags)) {
mutex_unlock(&error->wedge_mutex);
return;
}
if (GEM_SHOW_DEBUG() && !intel_engines_are_idle(i915)) {
struct drm_printer p = drm_debug_printer(__func__);
@ -3199,8 +3204,7 @@ void i915_gem_set_wedged(struct drm_i915_private *i915)
intel_engine_dump(engine, &p, "%s\n", engine->name);
}
if (test_and_set_bit(I915_WEDGED, &i915->gpu_error.flags))
goto out;
GEM_TRACE("start\n");
/*
* First, stop submission to hw, but do not yet complete requests by
@ -3236,23 +3240,31 @@ void i915_gem_set_wedged(struct drm_i915_private *i915)
intel_engine_wakeup(engine);
}
out:
GEM_TRACE("end\n");
smp_mb__before_atomic();
set_bit(I915_WEDGED, &error->flags);
wake_up_all(&i915->gpu_error.reset_queue);
GEM_TRACE("end\n");
mutex_unlock(&error->wedge_mutex);
wake_up_all(&error->reset_queue);
}
bool i915_gem_unset_wedged(struct drm_i915_private *i915)
{
struct i915_gpu_error *error = &i915->gpu_error;
struct i915_timeline *tl;
bool ret = false;
lockdep_assert_held(&i915->drm.struct_mutex);
if (!test_bit(I915_WEDGED, &i915->gpu_error.flags))
if (!test_bit(I915_WEDGED, &error->flags))
return true;
if (!i915->gt.scratch) /* Never full initialised, recovery impossible */
return false;
mutex_lock(&error->wedge_mutex);
GEM_TRACE("start\n");
/*
@ -3286,7 +3298,7 @@ bool i915_gem_unset_wedged(struct drm_i915_private *i915)
*/
if (dma_fence_default_wait(&rq->fence, true,
MAX_SCHEDULE_TIMEOUT) < 0)
return false;
goto unlock;
}
i915_retire_requests(i915);
GEM_BUG_ON(i915->gt.active_requests);
@ -3309,8 +3321,11 @@ bool i915_gem_unset_wedged(struct drm_i915_private *i915)
smp_mb__before_atomic(); /* complete takeover before enabling execbuf */
clear_bit(I915_WEDGED, &i915->gpu_error.flags);
ret = true;
unlock:
mutex_unlock(&i915->gpu_error.wedge_mutex);
return true;
return ret;
}
static void
@ -5706,6 +5721,7 @@ int i915_gem_init_early(struct drm_i915_private *dev_priv)
i915_gem_idle_work_handler);
init_waitqueue_head(&dev_priv->gpu_error.wait_queue);
init_waitqueue_head(&dev_priv->gpu_error.reset_queue);
mutex_init(&dev_priv->gpu_error.wedge_mutex);
atomic_set(&dev_priv->mm.bsd_engine_dispatch_index, 0);

4
drivers/gpu/drm/i915/i915_gpu_error.h
View File

@ -271,8 +271,8 @@ struct i915_gpu_error {
#define I915_RESET_BACKOFF 0
#define I915_RESET_HANDOFF 1
#define I915_RESET_MODESET 2
#define I915_RESET_ENGINE 3
#define I915_WEDGED (BITS_PER_LONG - 1)
#define I915_RESET_ENGINE (I915_WEDGED - I915_NUM_ENGINES)
/** Number of times an engine has been reset */
u32 reset_engine_count[I915_NUM_ENGINES];
@ -283,6 +283,8 @@ struct i915_gpu_error {
/** Reason for the current *global* reset */
const char *reason;
struct mutex wedge_mutex; /* serialises wedging/unwedging */
/**
* Waitqueue to signal when a hang is detected. Used to for waiters
* to release the struct_mutex for the reset to procede.

1
drivers/gpu/drm/i915/selftests/mock_gem_device.c
View File

@ -188,6 +188,7 @@ struct drm_i915_private *mock_gem_device(void)
init_waitqueue_head(&i915->gpu_error.wait_queue);
init_waitqueue_head(&i915->gpu_error.reset_queue);
mutex_init(&i915->gpu_error.wedge_mutex);
i915->wq = alloc_ordered_workqueue("mock", 0);
if (!i915->wq)