From 22dd3bb9190566c7c3b80edb7dea67d1e21d0f91 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 9 Sep 2016 14:11:50 +0100 Subject: [PATCH] drm/i915: Mark up all locked waiters 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 Reviewed-by: Mika Kuoppala Link: http://patchwork.freedesktop.org/patch/msgid/20160909131201.16673-10-chris@chris-wilson.co.uk --- 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 0e4cbad7a883..6a270bc0fdb3 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -4794,7 +4794,9 @@ 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; -- 2.39.2