The free_list and worker was introduced in commit 5f09a9c8ab6b ("drm/i915:
Allow contexts to be unreferenced locklessly"), but subsequently made
redundant by the removal of the last sleeping lock in commit 2935ed5339c4
("drm/i915: Remove logical HW ID"). As we can now free the GEM context
immediately from any context, remove the deferral of the free_list
v2: Lift removing the context from the global list into close().
Suggested-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 59 +++----------------
drivers/gpu/drm/i915/gem/i915_gem_context.h | 1 -
.../gpu/drm/i915/gem/i915_gem_context_types.h | 1 -
drivers/gpu/drm/i915/i915_drv.h | 3 -
drivers/gpu/drm/i915/i915_gem.c | 2 -
.../gpu/drm/i915/selftests/mock_gem_device.c | 2 -
6 files changed, 8 insertions(+), 60 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index ad136d009d9b..738a07b3583c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -334,13 +334,12 @@ static struct i915_gem_engines *default_engines(struct i915_gem_context *ctx)
return e;
}
-static void i915_gem_context_free(struct i915_gem_context *ctx)
+void i915_gem_context_release(struct kref *ref)
{
- GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
+ struct i915_gem_context *ctx = container_of(ref, typeof(*ctx), ref);
- spin_lock(&ctx->i915->gem.contexts.lock);
- list_del(&ctx->link);
- spin_unlock(&ctx->i915->gem.contexts.lock);
+ trace_i915_context_free(ctx);
+ GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
mutex_destroy(&ctx->engines_mutex);
mutex_destroy(&ctx->lut_mutex);
@@ -354,37 +353,6 @@ static void i915_gem_context_free(struct i915_gem_context *ctx)
kfree_rcu(ctx, rcu);
}
-static void contexts_free_all(struct llist_node *list)
-{
- struct i915_gem_context *ctx, *cn;
-
- llist_for_each_entry_safe(ctx, cn, list, free_link)
- i915_gem_context_free(ctx);
-}
-
-static void contexts_flush_free(struct i915_gem_contexts *gc)
-{
- contexts_free_all(llist_del_all(&gc->free_list));
-}
-
-static void contexts_free_worker(struct work_struct *work)
-{
- struct i915_gem_contexts *gc =
- container_of(work, typeof(*gc), free_work);
-
- contexts_flush_free(gc);
-}
-
-void i915_gem_context_release(struct kref *ref)
-{
- struct i915_gem_context *ctx = container_of(ref, typeof(*ctx), ref);
- struct i915_gem_contexts *gc = &ctx->i915->gem.contexts;
-
- trace_i915_context_free(ctx);
- if (llist_add(&ctx->free_link, &gc->free_list))
- schedule_work(&gc->free_work);
-}
-
static inline struct i915_gem_engines *
__context_engines_static(const struct i915_gem_context *ctx)
{
@@ -633,6 +601,10 @@ static void context_close(struct i915_gem_context *ctx)
*/
lut_close(ctx);
+ spin_lock(&ctx->i915->gem.contexts.lock);
+ list_del(&ctx->link);
+ spin_unlock(&ctx->i915->gem.contexts.lock);
+
mutex_unlock(&ctx->mutex);
/*
@@ -850,9 +822,6 @@ i915_gem_create_context(struct drm_i915_private *i915, unsigned int flags)
!HAS_EXECLISTS(i915))
return ERR_PTR(-EINVAL);
- /* Reap the stale contexts */
- contexts_flush_free(&i915->gem.contexts);
-
ctx = __create_context(i915);
if (IS_ERR(ctx))
return ctx;
@@ -897,9 +866,6 @@ static void init_contexts(struct i915_gem_contexts *gc)
{
spin_lock_init(&gc->lock);
INIT_LIST_HEAD(&gc->list);
-
- INIT_WORK(&gc->free_work, contexts_free_worker);
- init_llist_head(&gc->free_list);
}
void i915_gem_init__contexts(struct drm_i915_private *i915)
@@ -907,12 +873,6 @@ void i915_gem_init__contexts(struct drm_i915_private *i915)
init_contexts(&i915->gem.contexts);
}
-void i915_gem_driver_release__contexts(struct drm_i915_private *i915)
-{
- flush_work(&i915->gem.contexts.free_work);
- rcu_barrier(); /* and flush the left over RCU frees */
-}
-
static int gem_context_register(struct i915_gem_context *ctx,
struct drm_i915_file_private *fpriv,
u32 *id)
@@ -986,7 +946,6 @@ int i915_gem_context_open(struct drm_i915_private *i915,
void i915_gem_context_close(struct drm_file *file)
{
struct drm_i915_file_private *file_priv = file->driver_priv;
- struct drm_i915_private *i915 = file_priv->dev_priv;
struct i915_address_space *vm;
struct i915_gem_context *ctx;
unsigned long idx;
@@ -998,8 +957,6 @@ void i915_gem_context_close(struct drm_file *file)
xa_for_each(&file_priv->vm_xa, idx, vm)
i915_vm_put(vm);
xa_destroy(&file_priv->vm_xa);
-
- contexts_flush_free(&i915->gem.contexts);
}
int i915_gem_vm_create_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.h b/drivers/gpu/drm/i915/gem/i915_gem_context.h
index a133f92bbedb..b5c908f3f4f2 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.h
@@ -110,7 +110,6 @@ i915_gem_context_clear_user_engines(struct i915_gem_context *ctx)
/* i915_gem_context.c */
void i915_gem_init__contexts(struct drm_i915_private *i915);
-void i915_gem_driver_release__contexts(struct drm_i915_private *i915);
int i915_gem_context_open(struct drm_i915_private *i915,
struct drm_file *file);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index ae14ca24a11f..1449f54924e0 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -108,7 +108,6 @@ struct i915_gem_context {
/** link: place with &drm_i915_private.context_list */
struct list_head link;
- struct llist_node free_link;
/**
* @ref: reference count
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5d04b282c060..c2d0156e8a5d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1172,9 +1172,6 @@ struct drm_i915_private {
struct i915_gem_contexts {
spinlock_t lock; /* locks list */
struct list_head list;
-
- struct llist_head free_list;
- struct work_struct free_work;
} contexts;
/*
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 58276694c848..17a4636ee542 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1207,8 +1207,6 @@ void i915_gem_driver_remove(struct drm_i915_private *dev_priv)
void i915_gem_driver_release(struct drm_i915_private *dev_priv)
{
- i915_gem_driver_release__contexts(dev_priv);
-
intel_gt_driver_release(&dev_priv->gt);
intel_wa_list_free(&dev_priv->gt_wa_list);
diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
index e946bd2087d8..0188f877cab2 100644
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -64,8 +64,6 @@ static void mock_device_release(struct drm_device *dev)
mock_device_flush(i915);
intel_gt_driver_remove(&i915->gt);
- i915_gem_driver_release__contexts(i915);
-
i915_gem_drain_workqueue(i915);
i915_gem_drain_freed_objects(i915);
--
2.20.1
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