In the next patch we want to handle reset directly by a locked waiter in
order to avoid issues with returning before the reset is handled. To
handle the reset, we must first know whether we hold the struct_mutex.
If we do not hold the struct_mtuex we can not perform the reset, but we do
not block the reset worker either (and so we can just continue to wait for
request completion) - otherwise we must relinquish the mutex.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 4 +++-
drivers/gpu/drm/i915/i915_gem.c | 7 +++++--
drivers/gpu/drm/i915/i915_gem_evict.c | 8 ++++++--
drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +-
drivers/gpu/drm/i915/i915_gem_request.c | 15 ++++++++++++---
drivers/gpu/drm/i915/i915_gem_request.h | 11 ++++++++---
drivers/gpu/drm/i915/i915_gem_shrinker.c | 2 +-
drivers/gpu/drm/i915/intel_ringbuffer.c | 3 ++-
8 files changed, 38 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 620e7daa133b..64702cc68e3a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4803,7 +4803,9 @@ i915_drop_caches_set(void *data, u64 val)
return ret;
if (val & DROP_ACTIVE) {
- ret = i915_gem_wait_for_idle(dev_priv, I915_WAIT_INTERRUPTIBLE);
+ ret = i915_gem_wait_for_idle(dev_priv,
+ I915_WAIT_INTERRUPTIBLE |
+ I915_WAIT_LOCKED);
if (ret)
goto unlock;
}
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 4617250c3000..23069a2d2850 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2802,7 +2802,8 @@ __i915_gem_object_sync(struct drm_i915_gem_request *to,
if (!i915.semaphores) {
ret = i915_wait_request(from,
- from->i915->mm.interruptible,
+ from->i915->mm.interruptible |
+ I915_WAIT_LOCKED,
NULL,
NO_WAITBOOST);
if (ret)
@@ -4304,7 +4305,9 @@ int i915_gem_suspend(struct drm_device *dev)
if (ret)
goto err;
- ret = i915_gem_wait_for_idle(dev_priv, I915_WAIT_INTERRUPTIBLE);
+ ret = i915_gem_wait_for_idle(dev_priv,
+ I915_WAIT_INTERRUPTIBLE |
+ I915_WAIT_LOCKED);
if (ret)
goto err;
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 103085246975..5b6f81c1dbca 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -170,7 +170,9 @@ search_again:
if (ret)
return ret;
- ret = i915_gem_wait_for_idle(dev_priv, I915_WAIT_INTERRUPTIBLE);
+ ret = i915_gem_wait_for_idle(dev_priv,
+ I915_WAIT_INTERRUPTIBLE |
+ I915_WAIT_LOCKED);
if (ret)
return ret;
@@ -275,7 +277,9 @@ int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
return ret;
}
- ret = i915_gem_wait_for_idle(dev_priv, I915_WAIT_INTERRUPTIBLE);
+ ret = i915_gem_wait_for_idle(dev_priv,
+ I915_WAIT_INTERRUPTIBLE |
+ I915_WAIT_LOCKED);
if (ret)
return ret;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 9bcac52b8268..f3c6876da521 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2683,7 +2683,7 @@ void i915_gem_gtt_finish_object(struct drm_i915_gem_object *obj)
struct i915_ggtt *ggtt = &dev_priv->ggtt;
if (unlikely(ggtt->do_idle_maps)) {
- if (i915_gem_wait_for_idle(dev_priv, 0)) {
+ if (i915_gem_wait_for_idle(dev_priv, I915_WAIT_LOCKED)) {
DRM_ERROR("Failed to wait for idle; VT'd may hang.\n");
/* Wait a bit, in hopes it avoids the hang */
udelay(10);
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index f4c15f319d08..5f89801e6a16 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -260,7 +260,9 @@ static int i915_gem_init_seqno(struct drm_i915_private *dev_priv, u32 seqno)
/* Carefully retire all requests without writing to the rings */
for_each_engine(engine, dev_priv) {
- ret = intel_engine_idle(engine, I915_WAIT_INTERRUPTIBLE);
+ ret = intel_engine_idle(engine,
+ I915_WAIT_INTERRUPTIBLE |
+ I915_WAIT_LOCKED);
if (ret)
return ret;
}
@@ -625,6 +627,10 @@ int i915_wait_request(struct drm_i915_gem_request *req,
int ret = 0;
might_sleep();
+#if IS_ENABLED(CONFIG_LOCKDEP)
+ GEM_BUG_ON(!!lockdep_is_held(&req->i915->drm.struct_mutex) !=
+ !!(flags & I915_WAIT_LOCKED));
+#endif
if (i915_gem_request_completed(req))
return 0;
@@ -667,7 +673,8 @@ int i915_wait_request(struct drm_i915_gem_request *req,
goto complete;
set_current_state(state);
- add_wait_queue(&req->i915->gpu_error.wait_queue, &reset);
+ if (flags & I915_WAIT_LOCKED)
+ add_wait_queue(&req->i915->gpu_error.wait_queue, &reset);
intel_wait_init(&wait, req->fence.seqno);
if (intel_engine_add_wait(req->engine, &wait))
@@ -707,10 +714,12 @@ wakeup:
if (i915_spin_request(req, state, 2))
break;
}
- remove_wait_queue(&req->i915->gpu_error.wait_queue, &reset);
intel_engine_remove_wait(req->engine, &wait);
+ if (flags & I915_WAIT_LOCKED)
+ remove_wait_queue(&req->i915->gpu_error.wait_queue, &reset);
__set_current_state(TASK_RUNNING);
+
complete:
trace_i915_gem_request_wait_end(req);
diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h
index 479896ef791e..def35721e9ed 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -222,7 +222,8 @@ int i915_wait_request(struct drm_i915_gem_request *req,
s64 *timeout,
struct intel_rps_client *rps)
__attribute__((nonnull(1)));
-#define I915_WAIT_INTERRUPTIBLE BIT(0)
+#define I915_WAIT_INTERRUPTIBLE BIT(0)
+#define I915_WAIT_LOCKED BIT(1) /* struct_mutex held, handle GPU reset */
static inline u32 intel_engine_get_seqno(struct intel_engine_cs *engine);
@@ -576,7 +577,9 @@ i915_gem_active_wait(const struct i915_gem_active *active, struct mutex *mutex)
if (!request)
return 0;
- return i915_wait_request(request, I915_WAIT_INTERRUPTIBLE, NULL, NULL);
+ return i915_wait_request(request,
+ I915_WAIT_INTERRUPTIBLE | I915_WAIT_LOCKED,
+ NULL, NULL);
}
/**
@@ -639,7 +642,9 @@ i915_gem_active_retire(struct i915_gem_active *active,
if (!request)
return 0;
- ret = i915_wait_request(request, I915_WAIT_INTERRUPTIBLE, NULL, NULL);
+ ret = i915_wait_request(request,
+ I915_WAIT_INTERRUPTIBLE | I915_WAIT_LOCKED,
+ NULL, NULL);
if (ret)
return ret;
diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index 35a05f4c51c1..1c237d02f30b 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -414,7 +414,7 @@ i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr
return NOTIFY_DONE;
/* Force everything onto the inactive lists */
- ret = i915_gem_wait_for_idle(dev_priv, 0);
+ ret = i915_gem_wait_for_idle(dev_priv, I915_WAIT_LOCKED);
if (ret)
goto out;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index a5bf18877068..8687a84a7ff3 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2223,7 +2223,8 @@ static int wait_for_space(struct drm_i915_gem_request *req, int bytes)
if (WARN_ON(&target->ring_link == &ring->request_list))
return -ENOSPC;
- ret = i915_wait_request(target, I915_WAIT_INTERRUPTIBLE,
+ ret = i915_wait_request(target,
+ I915_WAIT_INTERRUPTIBLE | I915_WAIT_LOCKED,
NULL, NO_WAITBOOST);
if (ret)
return ret;
--
2.9.3
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