Re: [PATCH 14/34] drm/i915: Pull VM lists under the VM mutex.

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On 21/01/2019 22:20, Chris Wilson wrote:
A starting point to counter the pervasive struct_mutex. For the goal of
avoiding (or at least blocking under them!) global locks during user
request submission, a simple but important step is being able to manage
each clients GTT separately. For which, we want to replace using the
struct_mutex as the guard for all things GTT/VM and switch instead to a
specific mutex inside i915_address_space.

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Regards,

Tvrtko

---
  drivers/gpu/drm/i915/i915_gem.c                 | 14 ++++++++------
  drivers/gpu/drm/i915/i915_gem_evict.c           |  2 ++
  drivers/gpu/drm/i915/i915_gem_gtt.c             | 15 +++++++++++++--
  drivers/gpu/drm/i915/i915_gem_shrinker.c        |  4 ++++
  drivers/gpu/drm/i915/i915_gem_stolen.c          |  2 ++
  drivers/gpu/drm/i915/i915_vma.c                 | 11 +++++++++++
  drivers/gpu/drm/i915/selftests/i915_gem_evict.c |  3 +++
  drivers/gpu/drm/i915/selftests/i915_gem_gtt.c   |  3 +++
  8 files changed, 46 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index f45186ddb236..538fa5404603 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -245,18 +245,19 @@ int
  i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
  			    struct drm_file *file)
  {
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
+	struct i915_ggtt *ggtt = &to_i915(dev)->ggtt;
  	struct drm_i915_gem_get_aperture *args = data;
  	struct i915_vma *vma;
  	u64 pinned;
+ mutex_lock(&ggtt->vm.mutex);
+
  	pinned = ggtt->vm.reserved;
-	mutex_lock(&dev->struct_mutex);
  	list_for_each_entry(vma, &ggtt->vm.bound_list, vm_link)
  		if (i915_vma_is_pinned(vma))
  			pinned += vma->node.size;
-	mutex_unlock(&dev->struct_mutex);
+
+	mutex_unlock(&ggtt->vm.mutex);
args->aper_size = ggtt->vm.total;
  	args->aper_available_size = args->aper_size - pinned;
@@ -1529,20 +1530,21 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
static void i915_gem_object_bump_inactive_ggtt(struct drm_i915_gem_object *obj)
  {
-	struct drm_i915_private *i915;
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
  	struct list_head *list;
  	struct i915_vma *vma;
GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); + mutex_lock(&i915->ggtt.vm.mutex);
  	for_each_ggtt_vma(vma, obj) {
  		if (!drm_mm_node_allocated(&vma->node))
  			continue;
list_move_tail(&vma->vm_link, &vma->vm->bound_list);
  	}
+	mutex_unlock(&i915->ggtt.vm.mutex);
- i915 = to_i915(obj->base.dev);
  	spin_lock(&i915->mm.obj_lock);
  	list = obj->bind_count ? &i915->mm.bound_list : &i915->mm.unbound_list;
  	list_move_tail(&obj->mm.link, list);
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 5cfe4b75e7d6..dc137701acb8 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -432,6 +432,7 @@ int i915_gem_evict_vm(struct i915_address_space *vm)
  	}
INIT_LIST_HEAD(&eviction_list);
+	mutex_lock(&vm->mutex);
  	list_for_each_entry(vma, &vm->bound_list, vm_link) {
  		if (i915_vma_is_pinned(vma))
  			continue;
@@ -439,6 +440,7 @@ int i915_gem_evict_vm(struct i915_address_space *vm)
  		__i915_vma_pin(vma);
  		list_add(&vma->evict_link, &eviction_list);
  	}
+	mutex_unlock(&vm->mutex);
ret = 0;
  	list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 2ad9070a54c1..49b00996a15e 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1931,7 +1931,10 @@ static struct i915_vma *pd_vma_create(struct gen6_hw_ppgtt *ppgtt, int size)
  	vma->ggtt_view.type = I915_GGTT_VIEW_ROTATED; /* prevent fencing */
INIT_LIST_HEAD(&vma->obj_link);
+
+	mutex_lock(&vma->vm->mutex);
  	list_add(&vma->vm_link, &vma->vm->unbound_list);
+	mutex_unlock(&vma->vm->mutex);
return vma;
  }
@@ -3504,9 +3507,10 @@ void i915_gem_restore_gtt_mappings(struct drm_i915_private *dev_priv)
i915_check_and_clear_faults(dev_priv); + mutex_lock(&ggtt->vm.mutex);
+
  	/* First fill our portion of the GTT with scratch pages */
  	ggtt->vm.clear_range(&ggtt->vm, 0, ggtt->vm.total);
-
  	ggtt->vm.closed = true; /* skip rewriting PTE on VMA unbind */
/* clflush objects bound into the GGTT and rebind them. */
@@ -3516,19 +3520,26 @@ void i915_gem_restore_gtt_mappings(struct drm_i915_private *dev_priv)
  		if (!(vma->flags & I915_VMA_GLOBAL_BIND))
  			continue;
+ mutex_unlock(&ggtt->vm.mutex);
+
  		if (!i915_vma_unbind(vma))
-			continue;
+			goto lock;
WARN_ON(i915_vma_bind(vma,
  				      obj ? obj->cache_level : 0,
  				      PIN_UPDATE));
  		if (obj)
  			WARN_ON(i915_gem_object_set_to_gtt_domain(obj, false));
+
+lock:
+		mutex_lock(&ggtt->vm.mutex);
  	}
ggtt->vm.closed = false;
  	i915_ggtt_invalidate(dev_priv);
+ mutex_unlock(&ggtt->vm.mutex);
+
  	if (INTEL_GEN(dev_priv) >= 8) {
  		struct intel_ppat *ppat = &dev_priv->ppat;
diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index a76d6c95c824..6da795c7e62e 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -461,6 +461,7 @@ i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr
  					       I915_SHRINK_VMAPS);
/* We also want to clear any cached iomaps as they wrap vmap */
+	mutex_lock(&i915->ggtt.vm.mutex);
  	list_for_each_entry_safe(vma, next,
  				 &i915->ggtt.vm.bound_list, vm_link) {
  		unsigned long count = vma->node.size >> PAGE_SHIFT;
@@ -468,9 +469,12 @@ i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr
  		if (!vma->iomap || i915_vma_is_active(vma))
  			continue;
+ mutex_unlock(&i915->ggtt.vm.mutex);
  		if (i915_vma_unbind(vma) == 0)
  			freed_pages += count;
+		mutex_lock(&i915->ggtt.vm.mutex);
  	}
+	mutex_unlock(&i915->ggtt.vm.mutex);
out:
  	shrinker_unlock(i915, unlock);
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index a9e365789686..74a9661479ca 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -702,7 +702,9 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
  	vma->flags |= I915_VMA_GLOBAL_BIND;
  	__i915_vma_set_map_and_fenceable(vma);
+ mutex_lock(&ggtt->vm.mutex);
  	list_move_tail(&vma->vm_link, &ggtt->vm.bound_list);
+	mutex_unlock(&ggtt->vm.mutex);
spin_lock(&dev_priv->mm.obj_lock);
  	list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list);
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 7de28baffb8f..dcbd0d345c72 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -213,7 +213,10 @@ vma_create(struct drm_i915_gem_object *obj,
  	}
  	rb_link_node(&vma->obj_node, rb, p);
  	rb_insert_color(&vma->obj_node, &obj->vma_tree);
+
+	mutex_lock(&vm->mutex);
  	list_add(&vma->vm_link, &vm->unbound_list);
+	mutex_unlock(&vm->mutex);
return vma; @@ -656,7 +659,9 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
  	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
  	GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, cache_level));
+ mutex_lock(&vma->vm->mutex);
  	list_move_tail(&vma->vm_link, &vma->vm->bound_list);
+	mutex_unlock(&vma->vm->mutex);
if (vma->obj) {
  		struct drm_i915_gem_object *obj = vma->obj;
@@ -689,8 +694,10 @@ i915_vma_remove(struct i915_vma *vma)
vma->ops->clear_pages(vma); + mutex_lock(&vma->vm->mutex);
  	drm_mm_remove_node(&vma->node);
  	list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
+	mutex_unlock(&vma->vm->mutex);
/*
  	 * Since the unbound list is global, only move to that list if
@@ -802,7 +809,11 @@ static void __i915_vma_destroy(struct i915_vma *vma)
  	GEM_BUG_ON(i915_gem_active_isset(&vma->last_fence));
list_del(&vma->obj_link);
+
+	mutex_lock(&vma->vm->mutex);
  	list_del(&vma->vm_link);
+	mutex_unlock(&vma->vm->mutex);
+
  	if (vma->obj)
  		rb_erase(&vma->obj_node, &vma->obj->vma_tree);
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_evict.c b/drivers/gpu/drm/i915/selftests/i915_gem_evict.c
index af9b85cb8639..32dce7176f63 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_evict.c
@@ -94,11 +94,14 @@ static int populate_ggtt(struct drm_i915_private *i915,
static void unpin_ggtt(struct drm_i915_private *i915)
  {
+	struct i915_ggtt *ggtt = &i915->ggtt;
  	struct i915_vma *vma;
+ mutex_lock(&ggtt->vm.mutex);
  	list_for_each_entry(vma, &i915->ggtt.vm.bound_list, vm_link)
  		if (vma->obj->mm.quirked)
  			i915_vma_unpin(vma);
+	mutex_unlock(&ggtt->vm.mutex);
  }
static void cleanup_objects(struct drm_i915_private *i915,
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 8feb4af308ff..3850ef4a5ec8 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -1237,7 +1237,10 @@ static void track_vma_bind(struct i915_vma *vma)
  	__i915_gem_object_pin_pages(obj);
vma->pages = obj->mm.pages;
+
+	mutex_lock(&vma->vm->mutex);
  	list_move_tail(&vma->vm_link, &vma->vm->bound_list);
+	mutex_unlock(&vma->vm->mutex);
  }
static int exercise_mock(struct drm_i915_private *i915,

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