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drm/i915: Only track live rings for retiring 

We don't need to track every ring for its lifetime as they are managed
by the contexts/engines. What we do want to track are the live rings so
that we can sporadically clean up requests if userspace falls behind. We
can simply restrict the gt->rings list to being only gt->live_rings.

v2: s/live/active/ for consistency with gt.active_requests

Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180430131503.5375-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-04-30 14:15:03 +01:00
parent b887d61546
commit 643b450a59
7 changed files with 18 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/i915_drv.h
View File

@ -2061,7 +2061,8 @@ struct drm_i915_private {
struct i915_gem_timeline global_timeline;
struct list_head timelines;
struct list_head rings;
struct list_head active_rings;
u32 active_requests;
u32 request_serial;

6
drivers/gpu/drm/i915/i915_gem.c
View File

@ -141,6 +141,7 @@ static u32 __i915_gem_park(struct drm_i915_private *i915)
{
lockdep_assert_held(&i915->drm.struct_mutex);
GEM_BUG_ON(i915->gt.active_requests);
GEM_BUG_ON(!list_empty(&i915->gt.active_rings));
if (!i915->gt.awake)
return I915_EPOCH_INVALID;
@ -5599,9 +5600,10 @@ int i915_gem_init_early(struct drm_i915_private *dev_priv)
if (!dev_priv->priorities)
goto err_dependencies;
mutex_lock(&dev_priv->drm.struct_mutex);
INIT_LIST_HEAD(&dev_priv->gt.rings);
INIT_LIST_HEAD(&dev_priv->gt.timelines);
INIT_LIST_HEAD(&dev_priv->gt.active_rings);
mutex_lock(&dev_priv->drm.struct_mutex);
err = i915_gem_timeline_init__global(dev_priv);
mutex_unlock(&dev_priv->drm.struct_mutex);
if (err)

10
drivers/gpu/drm/i915/i915_request.c
View File

@ -322,6 +322,7 @@ static void advance_ring(struct i915_request *request)
* noops - they are safe to be replayed on a reset.
*/
tail = READ_ONCE(request->tail);
list_del(&ring->active_link);
} else {
tail = request->postfix;
}
@ -1096,6 +1097,8 @@ void __i915_request_add(struct i915_request *request, bool flush_caches)
i915_gem_active_set(&timeline->last_request, request);
list_add_tail(&request->ring_link, &ring->request_list);
if (list_is_first(&request->ring_link, &ring->request_list))
list_add(&ring->active_link, &request->i915->gt.active_rings);
request->emitted_jiffies = jiffies;
/*
@ -1418,14 +1421,17 @@ static void ring_retire_requests(struct intel_ring *ring)
void i915_retire_requests(struct drm_i915_private *i915)
{
struct intel_ring *ring, *next;
struct intel_ring *ring, *tmp;
lockdep_assert_held(&i915->drm.struct_mutex);
if (!i915->gt.active_requests)
return;
list_for_each_entry_safe(ring, next, &i915->gt.rings, link)
/* An outstanding request must be on a still active ring somewhere */
GEM_BUG_ON(list_empty(&i915->gt.active_rings));
list_for_each_entry_safe(ring, tmp, &i915->gt.active_rings, active_link)
ring_retire_requests(ring);
}

4
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -1150,8 +1150,6 @@ intel_engine_create_ring(struct intel_engine_cs *engine, int size)
}
ring->vma = vma;
list_add(&ring->link, &engine->i915->gt.rings);
return ring;
}
@ -1163,8 +1161,6 @@ intel_ring_free(struct intel_ring *ring)
i915_vma_close(ring->vma);
__i915_gem_object_release_unless_active(obj);
list_del(&ring->link);
kfree(ring);
}

2
drivers/gpu/drm/i915/intel_ringbuffer.h
View File

@ -130,7 +130,7 @@ struct intel_ring {
void *vaddr;
struct list_head request_list;
struct list_head link;
struct list_head active_link;
u32 head;
u32 tail;

4
drivers/gpu/drm/i915/selftests/mock_engine.c
View File

@ -147,15 +147,11 @@ static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
INIT_LIST_HEAD(&ring->request_list);
intel_ring_update_space(ring);
list_add(&ring->link, &engine->i915->gt.rings);
return ring;
}
static void mock_ring_free(struct intel_ring *ring)
{
list_del(&ring->link);
kfree(ring);
}

5
drivers/gpu/drm/i915/selftests/mock_gem_device.c
View File

@ -224,9 +224,10 @@ struct drm_i915_private *mock_gem_device(void)
if (!i915->priorities)
goto err_dependencies;
mutex_lock(&i915->drm.struct_mutex);
INIT_LIST_HEAD(&i915->gt.rings);
INIT_LIST_HEAD(&i915->gt.timelines);
INIT_LIST_HEAD(&i915->gt.active_rings);
mutex_lock(&i915->drm.struct_mutex);
err = i915_gem_timeline_init__global(i915);
if (err) {
mutex_unlock(&i915->drm.struct_mutex);