Forgo the struct_mutex serialisation for i915_active, and interpose its
own mutex handling for active/retire.
This is a multi-layered sleight-of-hand. First, we had to ensure that no
active/retire callbacks accidentally inverted the mutex ordering rules,
nor assumed that they were themselves serialised by struct_mutex. More
challenging though, is the rule over updating elements of the active
rbtree. Instead of the whole i915_active now being serialised by
struct_mutex, allocations/rotations of the tree are serialised by the
i915_active.mutex and individual nodes are serialised by the caller
using the i915_timeline.mutex (we need to use nested spinlocks to
interact with the dma_fence callback lists).
The pain point here is that instead of a single mutex around execbuf, we
now have to take a mutex for active tracker (one for each vma, context,
etc) and a couple of spinlocks for each fence update. The improvement in
fine grained locking allowing for multiple concurrent clients
(eventually!) should be worth it in typical loads.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
.../gpu/drm/i915/display/intel_frontbuffer.c | 2 +-
drivers/gpu/drm/i915/display/intel_overlay.c | 6 +-
drivers/gpu/drm/i915/gem/i915_gem_context.c | 12 +-
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 2 +-
.../gpu/drm/i915/gem/i915_gem_object_types.h | 2 +
drivers/gpu/drm/i915/gem/i915_gem_pm.c | 9 +-
drivers/gpu/drm/i915/gt/intel_context.c | 2 +-
drivers/gpu/drm/i915/gt/intel_reset.c | 10 +-
drivers/gpu/drm/i915/gt/selftest_lrc.c | 10 +-
drivers/gpu/drm/i915/gvt/scheduler.c | 3 -
drivers/gpu/drm/i915/i915_active.c | 153 +++++----
drivers/gpu/drm/i915/i915_active.h | 305 ++++--------------
drivers/gpu/drm/i915/i915_active_types.h | 17 +-
drivers/gpu/drm/i915/i915_gem.c | 42 ++-
drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +-
drivers/gpu/drm/i915/i915_request.c | 58 +---
drivers/gpu/drm/i915/i915_request.h | 1 -
drivers/gpu/drm/i915/i915_timeline.c | 9 +-
drivers/gpu/drm/i915/i915_timeline_types.h | 2 +-
drivers/gpu/drm/i915/i915_vma.c | 36 +--
drivers/gpu/drm/i915/selftests/i915_active.c | 35 +-
.../gpu/drm/i915/selftests/mock_timeline.c | 2 +-
22 files changed, 234 insertions(+), 486 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.c b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
index 7128148155dc..e01509c6877b 100644
--- a/drivers/gpu/drm/i915/display/intel_frontbuffer.c
+++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
@@ -248,7 +248,7 @@ intel_frontbuffer_get(struct drm_i915_gem_object *obj)
front->obj = obj;
kref_init(&front->ref);
atomic_set(&front->bits, 0);
- i915_active_init(i915, &front->write,
+ i915_active_init(&front->write,
frontbuffer_active,
i915_active_may_sleep(frontbuffer_retire));
diff --git a/drivers/gpu/drm/i915/display/intel_overlay.c b/drivers/gpu/drm/i915/display/intel_overlay.c
index f0743af79fcb..d50a0196b166 100644
--- a/drivers/gpu/drm/i915/display/intel_overlay.c
+++ b/drivers/gpu/drm/i915/display/intel_overlay.c
@@ -230,7 +230,8 @@ alloc_request(struct intel_overlay *overlay, void (*fn)(struct intel_overlay *))
if (IS_ERR(rq))
return rq;
- err = i915_active_ref(&overlay->last_flip, rq->fence.context, rq);
+ err = i915_active_ref(&overlay->last_flip,
+ rq->fence.context, &rq->fence);
if (err) {
i915_request_add(rq);
return ERR_PTR(err);
@@ -1366,8 +1367,7 @@ void intel_overlay_setup(struct drm_i915_private *dev_priv)
overlay->contrast = 75;
overlay->saturation = 146;
- i915_active_init(dev_priv,
- &overlay->last_flip,
+ i915_active_init(&overlay->last_flip,
NULL, intel_overlay_last_flip_retire);
ret = get_registers(overlay, OVERLAY_NEEDS_PHYSICAL(dev_priv));
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 55b8f0e04846..1c8869b8ec20 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -911,20 +911,18 @@ static int context_barrier_task(struct i915_gem_context *ctx,
void (*task)(void *data),
void *data)
{
- struct drm_i915_private *i915 = ctx->i915;
struct context_barrier_task *cb;
struct i915_gem_engines_iter it;
struct intel_context *ce;
int err = 0;
- lockdep_assert_held(&i915->drm.struct_mutex);
GEM_BUG_ON(!task);
cb = kmalloc(sizeof(*cb), GFP_KERNEL);
if (!cb)
return -ENOMEM;
- i915_active_init(i915, &cb->base, NULL, cb_retire);
+ i915_active_init(&cb->base, NULL, cb_retire);
err = i915_active_acquire(&cb->base);
if (err) {
kfree(cb);
@@ -956,7 +954,9 @@ static int context_barrier_task(struct i915_gem_context *ctx,
if (emit)
err = emit(rq, data);
if (err == 0)
- err = i915_active_ref(&cb->base, rq->fence.context, rq);
+ err = i915_active_ref(&cb->base,
+ rq->fence.context,
+ &rq->fence);
i915_request_add(rq);
if (err)
@@ -1193,7 +1193,7 @@ gen8_modify_rpcs(struct intel_context *ce, struct intel_sseu sseu)
return PTR_ERR(rq);
/* Queue this switch after all other activity by this context. */
- ret = i915_active_request_set(&ce->ring->timeline->last_request, rq);
+ ret = i915_active_fence_set(&ce->ring->timeline->last_request, rq);
if (ret)
goto out_add;
@@ -1205,7 +1205,7 @@ gen8_modify_rpcs(struct intel_context *ce, struct intel_sseu sseu)
* words transfer the pinned ce object to tracked active request.
*/
GEM_BUG_ON(i915_active_is_idle(&ce->active));
- ret = i915_active_ref(&ce->active, rq->fence.context, rq);
+ ret = i915_active_ref(&ce->active, rq->fence.context, &rq->fence);
if (ret)
goto out_add;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 5fae0e50aad0..e847a8079705 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -1317,7 +1317,7 @@ relocate_entry(struct i915_vma *vma,
if (!eb->reloc_cache.vaddr &&
(DBG_FORCE_RELOC == FORCE_GPU_RELOC ||
- !reservation_object_test_signaled_rcu(vma->resv, true))) {
+ i915_vma_is_active(vma))) {
const unsigned int gen = eb->reloc_cache.gen;
unsigned int len;
u32 *batch;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index 21bfb7bd0f57..e87fca4d8194 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -11,6 +11,8 @@
#include <drm/drm_gem.h>
+#include <uapi/drm/i915_drm.h>
+
#include "i915_active.h"
#include "i915_selftest.h"
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pm.c b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
index 05011d4a3b88..35b73c347887 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
@@ -15,14 +15,11 @@ static void call_idle_barriers(struct intel_engine_cs *engine)
struct llist_node *node, *next;
llist_for_each_safe(node, next, llist_del_all(&engine->barrier_tasks)) {
- struct i915_active_request *active =
+ struct dma_fence_cb *cb =
container_of((struct list_head *)node,
- typeof(*active), link);
+ typeof(*cb), node);
- INIT_LIST_HEAD(&active->link);
- RCU_INIT_POINTER(active->request, NULL);
-
- active->retire(active, NULL);
+ cb->func(NULL, cb);
}
}
diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
index 70d3b2568227..d108ca8f2832 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.c
+++ b/drivers/gpu/drm/i915/gt/intel_context.c
@@ -184,7 +184,7 @@ intel_context_init(struct intel_context *ce,
mutex_init(&ce->pin_mutex);
- i915_active_init(ctx->i915, &ce->active,
+ i915_active_init(&ce->active,
__intel_context_active, __intel_context_retire);
}
diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index 4c478b38e420..d204aadf5d6f 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -882,10 +882,10 @@ static bool __i915_gem_unset_wedged(struct drm_i915_private *i915)
*/
mutex_lock(&i915->gt.timelines.mutex);
list_for_each_entry(tl, &i915->gt.timelines.active_list, link) {
- struct i915_request *rq;
+ struct dma_fence *fence;
- rq = i915_active_request_get_unlocked(&tl->last_request);
- if (!rq)
+ fence = i915_active_fence_get(&tl->last_request);
+ if (!fence)
continue;
/*
@@ -895,8 +895,8 @@ static bool __i915_gem_unset_wedged(struct drm_i915_private *i915)
* (I915_FENCE_TIMEOUT) so this wait should not be unbounded
* in the worst case.
*/
- dma_fence_default_wait(&rq->fence, false, MAX_SCHEDULE_TIMEOUT);
- i915_request_put(rq);
+ dma_fence_default_wait(fence, false, MAX_SCHEDULE_TIMEOUT);
+ dma_fence_put(fence);
}
mutex_unlock(&i915->gt.timelines.mutex);
diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 0c97f953e908..a391fd52adbc 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -854,9 +854,13 @@ static struct i915_request *dummy_request(struct intel_engine_cs *engine)
if (!rq)
return NULL;
- INIT_LIST_HEAD(&rq->active_list);
rq->engine = engine;
+ spin_lock_init(&rq->lock);
+ INIT_LIST_HEAD(&rq->fence.cb_list);
+ rq->fence.lock = &rq->lock;
+ rq->fence.ops = &i915_fence_ops;
+
i915_sched_node_init(&rq->sched);
/* mark this request as permanently incomplete */
@@ -945,8 +949,8 @@ static int live_suppress_wait_preempt(void *arg)
}
/* Disable NEWCLIENT promotion */
- __i915_active_request_set(&rq[i]->timeline->last_request,
- dummy);
+ __i915_active_fence_set(&rq[i]->timeline->last_request,
+ &dummy->fence);
i915_request_add(rq[i]);
}
diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
index 2144fb46d0e1..f3cec07ab5ab 100644
--- a/drivers/gpu/drm/i915/gvt/scheduler.c
+++ b/drivers/gpu/drm/i915/gvt/scheduler.c
@@ -393,11 +393,8 @@ intel_gvt_workload_req_alloc(struct intel_vgpu_workload *workload)
{
struct intel_vgpu *vgpu = workload->vgpu;
struct intel_vgpu_submission *s = &vgpu->submission;
- struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
struct i915_request *rq;
- lockdep_assert_held(&dev_priv->drm.struct_mutex);
-
if (workload->req)
return 0;
diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c
index 710805605bb3..cf31ef63713d 100644
--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -12,8 +12,6 @@
#include "i915_active.h"
#include "i915_globals.h"
-#define BKL(ref) (&(ref)->i915->drm.struct_mutex)
-
/*
* Active refs memory management
*
@@ -27,7 +25,7 @@ static struct i915_global_active {
} global;
struct active_node {
- struct i915_active_request base;
+ struct i915_active_fence base;
struct i915_active *ref;
struct rb_node node;
u64 timeline;
@@ -122,7 +120,7 @@ __active_retire(struct i915_active *ref)
ref->retire(ref);
rbtree_postorder_for_each_entry_safe(it, n, &root, node) {
- GEM_BUG_ON(i915_active_request_isset(&it->base));
+ GEM_BUG_ON(i915_active_fence_isset(&it->base));
kmem_cache_free(global.slab_cache, it);
}
}
@@ -158,12 +156,13 @@ active_retire(struct i915_active *ref)
}
static void
-node_retire(struct i915_active_request *base, struct i915_request *rq)
+node_retire(struct dma_fence *fence, struct dma_fence_cb *cb)
{
- active_retire(container_of(base, struct active_node, base)->ref);
+ i915_active_fence_cb(fence, cb);
+ active_retire(container_of(cb, struct active_node, base.cb)->ref);
}
-static struct i915_active_request *
+static struct i915_active_fence *
active_instance(struct i915_active *ref, u64 idx)
{
struct active_node *node, *prealloc;
@@ -206,7 +205,7 @@ active_instance(struct i915_active *ref, u64 idx)
}
node = prealloc;
- i915_active_request_init(&node->base, NULL, node_retire);
+ __i915_active_fence_init(&node->base, NULL, node_retire);
node->ref = ref;
node->timeline = idx;
@@ -220,8 +219,7 @@ active_instance(struct i915_active *ref, u64 idx)
return &node->base;
}
-void __i915_active_init(struct drm_i915_private *i915,
- struct i915_active *ref,
+void __i915_active_init(struct i915_active *ref,
int (*active)(struct i915_active *ref),
void (*retire)(struct i915_active *ref),
struct lock_class_key *key)
@@ -230,8 +228,6 @@ void __i915_active_init(struct drm_i915_private *i915,
debug_active_init(ref);
- ref->i915 = i915;
-
ref->flags = 0;
ref->active = active;
ref->retire = ptr_unpack_bits(retire, &bits, 2);
@@ -248,9 +244,9 @@ void __i915_active_init(struct drm_i915_private *i915,
int i915_active_ref(struct i915_active *ref,
u64 timeline,
- struct i915_request *rq)
+ struct dma_fence *fence)
{
- struct i915_active_request *active;
+ struct i915_active_fence *active;
int err;
/* Prevent reaping in case we malloc/wait while building the tree */
@@ -264,9 +260,9 @@ int i915_active_ref(struct i915_active *ref,
goto out;
}
- if (!i915_active_request_isset(active))
+ GEM_BUG_ON(!atomic_read(&ref->count));
+ if (!__i915_active_fence_set(active, fence))
atomic_inc(&ref->count);
- __i915_active_request_set(active, rq);
out:
i915_active_release(ref);
@@ -322,7 +318,14 @@ int i915_active_wait(struct i915_active *ref)
}
rbtree_postorder_for_each_entry_safe(it, n, &ref->tree, node) {
- err = i915_active_request_retire(&it->base, BKL(ref));
+ struct dma_fence *fence;
+
+ fence = i915_active_fence_get(&it->base);
+ if (!fence)
+ continue;
+
+ err = dma_fence_wait(fence, true);
+ dma_fence_put(fence);
if (err)
break;
}
@@ -338,40 +341,6 @@ int i915_active_wait(struct i915_active *ref)
return 0;
}
-int i915_request_await_active_request(struct i915_request *rq,
- struct i915_active_request *active)
-{
- struct i915_request *barrier =
- i915_active_request_raw(active, &rq->i915->drm.struct_mutex);
-
- return barrier ? i915_request_await_dma_fence(rq, &barrier->fence) : 0;
-}
-
-int i915_request_await_active(struct i915_request *rq, struct i915_active *ref)
-{
- struct active_node *it, *n;
- int err;
-
- if (RB_EMPTY_ROOT(&ref->tree))
- return 0;
-
- /* await allocates and so we need to avoid hitting the shrinker */
- err = i915_active_acquire(ref);
- if (err)
- return err;
-
- mutex_lock(&ref->mutex);
- rbtree_postorder_for_each_entry_safe(it, n, &ref->tree, node) {
- err = i915_request_await_active_request(rq, &it->base);
- if (err)
- break;
- }
- mutex_unlock(&ref->mutex);
-
- i915_active_release(ref);
- return err;
-}
-
#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
void i915_active_fini(struct i915_active *ref)
{
@@ -402,14 +371,13 @@ int i915_active_acquire_preallocate_barrier(struct i915_active *ref,
goto unwind;
}
- i915_active_request_init(&node->base,
- (void *)engine, node_retire);
+ __i915_active_fence_init(&node->base, engine, node_retire);
node->timeline = kctx->ring->timeline->fence_context;
node->ref = ref;
atomic_inc(&ref->count);
intel_engine_pm_get(engine);
- llist_add((struct llist_node *)&node->base.link,
+ llist_add((struct llist_node *)&node->base.cb.node,
&ref->barriers);
}
@@ -420,8 +388,8 @@ int i915_active_acquire_preallocate_barrier(struct i915_active *ref,
struct active_node *node;
node = container_of((struct list_head *)pos,
- typeof(*node), base.link);
- engine = (void *)rcu_access_pointer(node->base.request);
+ typeof(*node), base.cb.node);
+ engine = (void *)rcu_access_pointer(node->base.fence);
intel_engine_pm_put(engine);
kfree(node);
@@ -442,10 +410,10 @@ void i915_active_acquire_barrier(struct i915_active *ref)
struct rb_node **p, *parent;
node = container_of((struct list_head *)pos,
- typeof(*node), base.link);
+ typeof(*node), base.cb.node);
- engine = (void *)rcu_access_pointer(node->base.request);
- RCU_INIT_POINTER(node->base.request, ERR_PTR(-EAGAIN));
+ engine = (void *)rcu_access_pointer(node->base.fence);
+ RCU_INIT_POINTER(node->base.fence, ERR_PTR(-EAGAIN));
parent = NULL;
p = &ref->tree.rb_node;
@@ -461,7 +429,7 @@ void i915_active_acquire_barrier(struct i915_active *ref)
rb_link_node(&node->node, parent, p);
rb_insert_color(&node->node, &ref->tree);
- llist_add((struct llist_node *)&node->base.link,
+ llist_add((struct llist_node *)&node->base.cb.node,
&engine->barrier_tasks);
intel_engine_pm_put(engine);
}
@@ -472,29 +440,72 @@ void i915_request_add_barriers(struct i915_request *rq)
{
struct intel_engine_cs *engine = rq->engine;
struct llist_node *node, *next;
+ unsigned long flags;
+
+ GEM_BUG_ON(intel_engine_is_virtual(engine));
+ node = llist_del_all(&engine->barrier_tasks);
+ if (!node)
+ return;
- llist_for_each_safe(node, next, llist_del_all(&engine->barrier_tasks))
- list_add_tail((struct list_head *)node, &rq->active_list);
+ spin_lock_irqsave(&rq->lock, flags);
+ llist_for_each_safe(node, next, node)
+ list_add_tail((struct list_head *)node, &rq->fence.cb_list);
+ spin_unlock_irqrestore(&rq->lock, flags);
}
-int i915_active_request_set(struct i915_active_request *active,
- struct i915_request *rq)
+struct dma_fence *
+__i915_active_fence_set(struct i915_active_fence *active,
+ struct dma_fence *fence)
{
+ struct dma_fence *prev;
+ unsigned long flags;
+
+ /* NB: updates must be serialised by an outer timeline mutex */
+ spin_lock_irqsave(fence->lock, flags);
+ GEM_BUG_ON(test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags));
+
+ prev = rcu_dereference_protected(active->fence, 1 /* timeline mutex */);
+ if (prev) {
+ spin_lock_nested(prev->lock, SINGLE_DEPTH_NESTING);
+ __list_del_entry(&active->cb.node);
+ spin_unlock(prev->lock);
+ prev = rcu_access_pointer(active->fence);
+ }
+
+ rcu_assign_pointer(active->fence, fence);
+ list_add_tail(&active->cb.node, &fence->cb_list);
+
+ spin_unlock_irqrestore(fence->lock, flags);
+
+ return prev;
+}
+
+int i915_active_fence_set(struct i915_active_fence *active,
+ struct i915_request *rq)
+{
+ struct dma_fence *fence;
int err;
/* Must maintain ordering wrt previous active requests */
- err = i915_request_await_active_request(rq, active);
- if (err)
- return err;
+ rcu_read_lock();
+ fence = __i915_active_fence_set(active, &rq->fence);
+ if (fence)
+ fence = dma_fence_get_rcu(fence);
+ rcu_read_unlock();
+
+ if (fence) {
+ err = i915_request_await_dma_fence(rq, fence);
+ dma_fence_put(fence);
+ if (err)
+ return err;
+ }
- __i915_active_request_set(active, rq);
return 0;
}
-void i915_active_retire_noop(struct i915_active_request *active,
- struct i915_request *request)
+void i915_active_noop(struct dma_fence *fence, struct dma_fence_cb *cb)
{
- /* Space left intentionally blank */
+ i915_active_fence_cb(fence, cb);
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
diff --git a/drivers/gpu/drm/i915/i915_active.h b/drivers/gpu/drm/i915/i915_active.h
index 911a8338007a..fdf87bad76d5 100644
--- a/drivers/gpu/drm/i915/i915_active.h
+++ b/drivers/gpu/drm/i915/i915_active.h
@@ -10,7 +10,9 @@
#include <linux/lockdep.h>
#include "i915_active_types.h"
-#include "i915_request.h"
+
+struct i915_request;
+struct intel_engine_cs;
/*
* We treat requests as fences. This is not be to confused with our
@@ -28,300 +30,103 @@
* write access so that we can perform concurrent read operations between
* the CPU and GPU engines, as well as waiting for all rendering to
* complete, or waiting for the last GPU user of a "fence register". The
- * object then embeds a #i915_active_request to track the most recent (in
+ * object then embeds a #i915_active_fence to track the most recent (in
* retirement order) request relevant for the desired mode of access.
- * The #i915_active_request is updated with i915_active_request_set() to
+ * The #i915_active_fence is updated with i915_active_fence_set() to
* track the most recent fence request, typically this is done as part of
* i915_vma_move_to_active().
*
- * When the #i915_active_request completes (is retired), it will
+ * When the #i915_active_fence completes (is retired), it will
* signal its completion to the owner through a callback as well as mark
- * itself as idle (i915_active_request.request == NULL). The owner
+ * itself as idle (i915_active_fence.request == NULL). The owner
* can then perform any action, such as delayed freeing of an active
* resource including itself.
*/
-void i915_active_retire_noop(struct i915_active_request *active,
- struct i915_request *request);
+void i915_active_noop(struct dma_fence *fence, struct dma_fence_cb *cb);
/**
- * i915_active_request_init - prepares the activity tracker for use
+ * __i915_active_fence_init - prepares the activity tracker for use
* @active - the active tracker
- * @rq - initial request to track, can be NULL
+ * @fence - initial fence to track, can be NULL
* @func - a callback when then the tracker is retired (becomes idle),
* can be NULL
*
- * i915_active_request_init() prepares the embedded @active struct for use as
- * an activity tracker, that is for tracking the last known active request
- * associated with it. When the last request becomes idle, when it is retired
+ * i915_active_fence_init() prepares the embedded @active struct for use as
+ * an activity tracker, that is for tracking the last known active fence
+ * associated with it. When the last fence becomes idle, when it is retired
* after completion, the optional callback @func is invoked.
*/
static inline void
-i915_active_request_init(struct i915_active_request *active,
- struct i915_request *rq,
- i915_active_retire_fn retire)
+__i915_active_fence_init(struct i915_active_fence *active,
+ void *fence,
+ dma_fence_func_t fn)
{
- RCU_INIT_POINTER(active->request, rq);
- INIT_LIST_HEAD(&active->link);
- active->retire = retire ?: i915_active_retire_noop;
+ RCU_INIT_POINTER(active->fence, fence);
+ active->cb.func = fn ?: i915_active_noop;
}
-#define INIT_ACTIVE_REQUEST(name) i915_active_request_init((name), NULL, NULL)
-
-/**
- * i915_active_request_set - updates the tracker to watch the current request
- * @active - the active tracker
- * @request - the request to watch
- *
- * __i915_active_request_set() watches the given @request for completion. Whilst
- * that @request is busy, the @active reports busy. When that @request is
- * retired, the @active tracker is updated to report idle.
- */
-static inline void
-__i915_active_request_set(struct i915_active_request *active,
- struct i915_request *request)
-{
- list_move(&active->link, &request->active_list);
- rcu_assign_pointer(active->request, request);
-}
-
-int __must_check
-i915_active_request_set(struct i915_active_request *active,
- struct i915_request *rq);
-
-/**
- * i915_active_request_raw - return the active request
- * @active - the active tracker
- *
- * i915_active_request_raw() returns the current request being tracked, or NULL.
- * It does not obtain a reference on the request for the caller, so the caller
- * must hold struct_mutex.
- */
-static inline struct i915_request *
-i915_active_request_raw(const struct i915_active_request *active,
- struct mutex *mutex)
-{
- return rcu_dereference_protected(active->request,
- lockdep_is_held(mutex));
-}
-
-/**
- * i915_active_request_peek - report the active request being monitored
- * @active - the active tracker
- *
- * i915_active_request_peek() returns the current request being tracked if
- * still active, or NULL. It does not obtain a reference on the request
- * for the caller, so the caller must hold struct_mutex.
- */
-static inline struct i915_request *
-i915_active_request_peek(const struct i915_active_request *active,
- struct mutex *mutex)
-{
- struct i915_request *request;
-
- request = i915_active_request_raw(active, mutex);
- if (!request || i915_request_completed(request))
- return NULL;
+#define INIT_ACTIVE_FENCE(A) __i915_active_fence_init(A, NULL, NULL)
- return request;
-}
+struct dma_fence *
+__i915_active_fence_set(struct i915_active_fence *active,
+ struct dma_fence *fence);
/**
- * i915_active_request_get - return a reference to the active request
+ * i915_active_fence_set - updates the tracker to watch the current fence
* @active - the active tracker
+ * @rq - the request to watch
*
- * i915_active_request_get() returns a reference to the active request, or NULL
- * if the active tracker is idle. The caller must hold struct_mutex.
+ * i915_active_fence_set() watches the given @rq for completion. While
+ * that @rq is busy, the @active reports busy. When that @rq is signaled
+ * (or else retired) the @active tracker is updated to report idle.
*/
-static inline struct i915_request *
-i915_active_request_get(const struct i915_active_request *active,
- struct mutex *mutex)
-{
- return i915_request_get(i915_active_request_peek(active, mutex));
-}
-
-/**
- * __i915_active_request_get_rcu - return a reference to the active request
- * @active - the active tracker
- *
- * __i915_active_request_get() returns a reference to the active request,
- * or NULL if the active tracker is idle. The caller must hold the RCU read
- * lock, but the returned pointer is safe to use outside of RCU.
- */
-static inline struct i915_request *
-__i915_active_request_get_rcu(const struct i915_active_request *active)
-{
- /*
- * Performing a lockless retrieval of the active request is super
- * tricky. SLAB_TYPESAFE_BY_RCU merely guarantees that the backing
- * slab of request objects will not be freed whilst we hold the
- * RCU read lock. It does not guarantee that the request itself
- * will not be freed and then *reused*. Viz,
- *
- * Thread A Thread B
- *
- * rq = active.request
- * retire(rq) -> free(rq);
- * (rq is now first on the slab freelist)
- * active.request = NULL
- *
- * rq = new submission on a new object
- * ref(rq)
- *
- * To prevent the request from being reused whilst the caller
- * uses it, we take a reference like normal. Whilst acquiring
- * the reference we check that it is not in a destroyed state
- * (refcnt == 0). That prevents the request being reallocated
- * whilst the caller holds on to it. To check that the request
- * was not reallocated as we acquired the reference we have to
- * check that our request remains the active request across
- * the lookup, in the same manner as a seqlock. The visibility
- * of the pointer versus the reference counting is controlled
- * by using RCU barriers (rcu_dereference and rcu_assign_pointer).
- *
- * In the middle of all that, we inspect whether the request is
- * complete. Retiring is lazy so the request may be completed long
- * before the active tracker is updated. Querying whether the
- * request is complete is far cheaper (as it involves no locked
- * instructions setting cachelines to exclusive) than acquiring
- * the reference, so we do it first. The RCU read lock ensures the
- * pointer dereference is valid, but does not ensure that the
- * seqno nor HWS is the right one! However, if the request was
- * reallocated, that means the active tracker's request was complete.
- * If the new request is also complete, then both are and we can
- * just report the active tracker is idle. If the new request is
- * incomplete, then we acquire a reference on it and check that
- * it remained the active request.
- *
- * It is then imperative that we do not zero the request on
- * reallocation, so that we can chase the dangling pointers!
- * See i915_request_alloc().
- */
- do {
- struct i915_request *request;
-
- request = rcu_dereference(active->request);
- if (!request || i915_request_completed(request))
- return NULL;
-
- /*
- * An especially silly compiler could decide to recompute the
- * result of i915_request_completed, more specifically
- * re-emit the load for request->fence.seqno. A race would catch
- * a later seqno value, which could flip the result from true to
- * false. Which means part of the instructions below might not
- * be executed, while later on instructions are executed. Due to
- * barriers within the refcounting the inconsistency can't reach
- * past the call to i915_request_get_rcu, but not executing
- * that while still executing i915_request_put() creates
- * havoc enough. Prevent this with a compiler barrier.
- */
- barrier();
-
- request = i915_request_get_rcu(request);
-
- /*
- * What stops the following rcu_access_pointer() from occurring
- * before the above i915_request_get_rcu()? If we were
- * to read the value before pausing to get the reference to
- * the request, we may not notice a change in the active
- * tracker.
- *
- * The rcu_access_pointer() is a mere compiler barrier, which
- * means both the CPU and compiler are free to perform the
- * memory read without constraint. The compiler only has to
- * ensure that any operations after the rcu_access_pointer()
- * occur afterwards in program order. This means the read may
- * be performed earlier by an out-of-order CPU, or adventurous
- * compiler.
- *
- * The atomic operation at the heart of
- * i915_request_get_rcu(), see dma_fence_get_rcu(), is
- * atomic_inc_not_zero() which is only a full memory barrier
- * when successful. That is, if i915_request_get_rcu()
- * returns the request (and so with the reference counted
- * incremented) then the following read for rcu_access_pointer()
- * must occur after the atomic operation and so confirm
- * that this request is the one currently being tracked.
- *
- * The corresponding write barrier is part of
- * rcu_assign_pointer().
- */
- if (!request || request == rcu_access_pointer(active->request))
- return rcu_pointer_handoff(request);
-
- i915_request_put(request);
- } while (1);
-}
-
+int __must_check
+i915_active_fence_set(struct i915_active_fence *active,
+ struct i915_request *rq);
/**
- * i915_active_request_get_unlocked - return a reference to the active request
+ * i915_active_fence_get - return a reference to the active fence
* @active - the active tracker
*
- * i915_active_request_get_unlocked() returns a reference to the active request,
+ * i915_active_fence_get() returns a reference to the active fence,
* or NULL if the active tracker is idle. The reference is obtained under RCU,
* so no locking is required by the caller.
*
- * The reference should be freed with i915_request_put().
+ * The reference should be freed with dma_fence_put().
*/
-static inline struct i915_request *
-i915_active_request_get_unlocked(const struct i915_active_request *active)
+static inline struct dma_fence *
+i915_active_fence_get(struct i915_active_fence *active)
{
- struct i915_request *request;
+ struct dma_fence *fence;
rcu_read_lock();
- request = __i915_active_request_get_rcu(active);
+ fence = dma_fence_get_rcu_safe(&active->fence);
rcu_read_unlock();
- return request;
+ return fence;
}
/**
- * i915_active_request_isset - report whether the active tracker is assigned
+ * i915_active_fence_isset - report whether the active tracker is assigned
* @active - the active tracker
*
- * i915_active_request_isset() returns true if the active tracker is currently
- * assigned to a request. Due to the lazy retiring, that request may be idle
+ * i915_active_fence_isset() returns true if the active tracker is currently
+ * assigned to a fence. Due to the lazy retiring, that fence may be idle
* and this may report stale information.
*/
static inline bool
-i915_active_request_isset(const struct i915_active_request *active)
+i915_active_fence_isset(const struct i915_active_fence *active)
{
- return rcu_access_pointer(active->request);
+ return rcu_access_pointer(active->fence);
}
-/**
- * i915_active_request_retire - waits until the request is retired
- * @active - the active request on which to wait
- *
- * i915_active_request_retire() waits until the request is completed,
- * and then ensures that at least the retirement handler for this
- * @active tracker is called before returning. If the @active
- * tracker is idle, the function returns immediately.
- */
-static inline int __must_check
-i915_active_request_retire(struct i915_active_request *active,
- struct mutex *mutex)
+static inline void
+i915_active_fence_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
{
- struct i915_request *request;
- long ret;
-
- request = i915_active_request_raw(active, mutex);
- if (!request)
- return 0;
-
- ret = i915_request_wait(request,
- I915_WAIT_INTERRUPTIBLE,
- MAX_SCHEDULE_TIMEOUT);
- if (ret < 0)
- return ret;
-
- list_del_init(&active->link);
- RCU_INIT_POINTER(active->request, NULL);
-
- active->retire(active, request);
+ struct i915_active_fence *active =
+ container_of(cb, typeof(*active), cb);
- return 0;
+ RCU_INIT_POINTER(active->fence, NULL);
}
/*
@@ -350,31 +155,29 @@ i915_active_request_retire(struct i915_active_request *active,
* synchronisation.
*/
-void __i915_active_init(struct drm_i915_private *i915,
- struct i915_active *ref,
+void __i915_active_init(struct i915_active *ref,
int (*active)(struct i915_active *ref),
void (*retire)(struct i915_active *ref),
struct lock_class_key *key);
-#define i915_active_init(i915, ref, active, retire) do { \
+#define i915_active_init(ref, active, retire) do { \
static struct lock_class_key __key; \
\
- __i915_active_init(i915, ref, active, retire, &__key); \
+ __i915_active_init(ref, active, retire, &__key); \
} while (0)
int i915_active_ref(struct i915_active *ref,
u64 timeline,
- struct i915_request *rq);
+ struct dma_fence *fence);
int i915_active_wait(struct i915_active *ref);
int i915_request_await_active(struct i915_request *rq,
struct i915_active *ref);
-int i915_request_await_active_request(struct i915_request *rq,
- struct i915_active_request *active);
+int i915_request_await_active_fence(struct i915_request *rq,
+ struct i915_active_fence *active);
int i915_active_acquire(struct i915_active *ref);
void i915_active_release(struct i915_active *ref);
-void __i915_active_release_nested(struct i915_active *ref, int subclass);
static inline bool
i915_active_is_idle(const struct i915_active *ref)
diff --git a/drivers/gpu/drm/i915/i915_active_types.h b/drivers/gpu/drm/i915/i915_active_types.h
index a3a5ec3e4163..42aaa29210a8 100644
--- a/drivers/gpu/drm/i915/i915_active_types.h
+++ b/drivers/gpu/drm/i915/i915_active_types.h
@@ -8,6 +8,7 @@
#define _I915_ACTIVE_TYPES_H_
#include <linux/atomic.h>
+#include <linux/dma-fence.h>
#include <linux/llist.h>
#include <linux/mutex.h>
#include <linux/rbtree.h>
@@ -16,17 +17,9 @@
#include "i915_utils.h"
-struct drm_i915_private;
-struct i915_active_request;
-struct i915_request;
-
-typedef void (*i915_active_retire_fn)(struct i915_active_request *,
- struct i915_request *);
-
-struct i915_active_request {
- struct i915_request __rcu *request;
- struct list_head link;
- i915_active_retire_fn retire;
+struct i915_active_fence {
+ struct dma_fence __rcu *fence;
+ struct dma_fence_cb cb;
};
struct active_node;
@@ -37,8 +30,6 @@ struct active_node;
#define i915_active_may_sleep(fn) ptr_pack_bits(&(fn), I915_ACTIVE_MAY_SLEEP, 2)
struct i915_active {
- struct drm_i915_private *i915;
-
struct active_node *cache;
struct rb_root tree;
struct mutex mutex;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index b1e4db25f94e..bac7df724f07 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -954,28 +954,38 @@ wait_for_timelines(struct drm_i915_private *i915,
mutex_lock(>->mutex);
list_for_each_entry(tl, >->active_list, link) {
- struct i915_request *rq;
+ struct dma_fence *fence;
- rq = i915_active_request_get_unlocked(&tl->last_request);
- if (!rq)
+ fence = i915_active_fence_get(&tl->last_request);
+ if (!fence)
continue;
mutex_unlock(>->mutex);
- /*
- * "Race-to-idle".
- *
- * Switching to the kernel context is often used a synchronous
- * step prior to idling, e.g. in suspend for flushing all
- * current operations to memory before sleeping. These we
- * want to complete as quickly as possible to avoid prolonged
- * stalls, so allow the gpu to boost to maximum clocks.
- */
- if (flags & I915_WAIT_FOR_IDLE_BOOST)
- gen6_rps_boost(rq);
+ if (!dma_fence_is_i915(fence)) {
+ timeout = dma_fence_wait_timeout(fence,
+ flags & I915_WAIT_INTERRUPTIBLE,
+ timeout);
+ } else {
+ struct i915_request *rq = to_request(fence);
+
+ /*
+ * "Race-to-idle".
+ *
+ * Switching to the kernel context is often used as
+ * a synchronous step prior to idling, e.g. in suspend
+ * for flushing all current operations to memory before
+ * sleeping. These we want to complete as quickly as
+ * possible to avoid prolonged stalls, so allow the gpu
+ * to boost to maximum clocks.
+ */
+ if (flags & I915_WAIT_FOR_IDLE_BOOST)
+ gen6_rps_boost(rq);
+
+ timeout = i915_request_wait(rq, flags, timeout);
+ }
- timeout = i915_request_wait(rq, flags, timeout);
- i915_request_put(rq);
+ dma_fence_put(fence);
if (timeout < 0)
return timeout;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 8c58e6f0a2b4..eaeff5f8cd16 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2049,7 +2049,7 @@ static struct i915_vma *pd_vma_create(struct gen6_ppgtt *ppgtt, int size)
if (!vma)
return ERR_PTR(-ENOMEM);
- i915_active_init(i915, &vma->active, NULL, NULL);
+ i915_active_init(&vma->active, NULL, NULL);
vma->vm = &ggtt->vm;
vma->ops = &pd_vma_ops;
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 201bd8d1506f..ef67c58698d8 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -229,9 +229,8 @@ static void free_capture_list(struct i915_request *request)
static bool i915_request_retire(struct i915_request *rq)
{
- struct i915_active_request *active, *next;
+ lockdep_assert_held(&rq->timeline->mutex);
- lockdep_assert_held(&rq->i915->drm.struct_mutex);
if (!i915_request_completed(rq))
return false;
@@ -245,35 +244,6 @@ static bool i915_request_retire(struct i915_request *rq)
advance_ring(rq);
- /*
- * Walk through the active list, calling retire on each. This allows
- * objects to track their GPU activity and mark themselves as idle
- * when their *last* active request is completed (updating state
- * tracking lists for eviction, active references for GEM, etc).
- *
- * As the ->retire() may free the node, we decouple it first and
- * pass along the auxiliary information (to avoid dereferencing
- * the node after the callback).
- */
- list_for_each_entry_safe(active, next, &rq->active_list, link) {
- /*
- * In microbenchmarks or focusing upon time inside the kernel,
- * we may spend an inordinate amount of time simply handling
- * the retirement of requests and processing their callbacks.
- * Of which, this loop itself is particularly hot due to the
- * cache misses when jumping around the list of
- * i915_active_request. So we try to keep this loop as
- * streamlined as possible and also prefetch the next
- * i915_active_request to try and hide the likely cache miss.
- */
- prefetchw(next);
-
- INIT_LIST_HEAD(&active->link);
- RCU_INIT_POINTER(active->request, NULL);
-
- active->retire(active, rq);
- }
-
local_irq_disable();
/*
@@ -328,11 +298,9 @@ void i915_request_retire_upto(struct i915_request *rq)
rq->fence.context, rq->fence.seqno,
hwsp_seqno(rq));
- lockdep_assert_held(&rq->i915->drm.struct_mutex);
+ lockdep_assert_held(&rq->timeline->mutex);
GEM_BUG_ON(!i915_request_completed(rq));
-
- if (list_empty(&rq->ring_link))
- return;
+ GEM_BUG_ON(list_empty(&rq->ring_link));
do {
tmp = list_first_entry(&ring->request_list,
@@ -567,6 +535,7 @@ static void ring_retire_requests(struct intel_ring *ring)
{
struct i915_request *rq, *rn;
+ lockdep_assert_held(&ring->timeline->mutex);
list_for_each_entry_safe(rq, rn, &ring->request_list, ring_link)
if (!i915_request_retire(rq))
break;
@@ -687,7 +656,6 @@ __i915_request_create(struct intel_context *ce, gfp_t gfp)
rq->waitboost = false;
rq->execution_mask = ALL_ENGINES;
- INIT_LIST_HEAD(&rq->active_list);
INIT_LIST_HEAD(&rq->execute_cb);
/*
@@ -726,7 +694,6 @@ __i915_request_create(struct intel_context *ce, gfp_t gfp)
ce->ring->emit = rq->head;
/* Make sure we didn't add ourselves to external state before freeing */
- GEM_BUG_ON(!list_empty(&rq->active_list));
GEM_BUG_ON(!list_empty(&rq->sched.signalers_list));
GEM_BUG_ON(!list_empty(&rq->sched.waiters_list));
@@ -1115,7 +1082,8 @@ __i915_request_add_to_timeline(struct i915_request *rq)
* precludes optimising to use semaphores serialisation of a single
* timeline across engines.
*/
- prev = rcu_dereference_protected(timeline->last_request.request, 1);
+ prev = to_request(__i915_active_fence_set(&timeline->last_request,
+ &rq->fence));
if (prev && !i915_request_completed(prev)) {
if (is_power_of_2(prev->engine->mask | rq->engine->mask))
i915_sw_fence_await_sw_fence(&rq->submit,
@@ -1140,7 +1108,6 @@ __i915_request_add_to_timeline(struct i915_request *rq)
* us, the timeline will hold its seqno which is later than ours.
*/
GEM_BUG_ON(timeline->seqno != rq->fence.seqno);
- __i915_active_request_set(&timeline->last_request, rq);
return prev;
}
@@ -1237,10 +1204,11 @@ struct i915_request *__i915_request_commit(struct i915_request *rq)
void i915_request_add(struct i915_request *rq)
{
+ struct i915_timeline * const tl = rq->timeline;
struct i915_request *prev;
- lockdep_assert_held(&rq->timeline->mutex);
- lockdep_unpin_lock(&rq->timeline->mutex, rq->cookie);
+ lockdep_assert_held(&tl->mutex);
+ lockdep_unpin_lock(&tl->mutex, rq->cookie);
trace_i915_request_add(rq);
@@ -1263,10 +1231,10 @@ void i915_request_add(struct i915_request *rq)
* work on behalf of others -- but instead we should benefit from
* improved resource management. (Well, that's the theory at least.)
*/
- if (prev && i915_request_completed(prev))
+ if (prev && i915_request_completed(prev) && prev->timeline == tl)
i915_request_retire_upto(prev);
- mutex_unlock(&rq->timeline->mutex);
+ mutex_unlock(&tl->mutex);
}
static unsigned long local_clock_us(unsigned int *cpu)
@@ -1494,7 +1462,11 @@ bool i915_retire_requests(struct drm_i915_private *i915)
list_for_each_entry_safe(ring, tmp,
&i915->gt.active_rings, active_link) {
intel_ring_get(ring); /* last rq holds reference! */
+ mutex_lock(&ring->timeline->mutex);
+
ring_retire_requests(ring);
+
+ mutex_unlock(&ring->timeline->mutex);
intel_ring_put(ring);
}
diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index bebc1e9b4a5e..8277cff0df70 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -211,7 +211,6 @@ struct i915_request {
* on the active_list (of their final request).
*/
struct i915_capture_list *capture_list;
- struct list_head active_list;
/** Time at which this request was emitted, in jiffies. */
unsigned long emitted_jiffies;
diff --git a/drivers/gpu/drm/i915/i915_timeline.c b/drivers/gpu/drm/i915/i915_timeline.c
index 0f4ca9478ae5..fcab785c9a29 100644
--- a/drivers/gpu/drm/i915/i915_timeline.c
+++ b/drivers/gpu/drm/i915/i915_timeline.c
@@ -180,8 +180,7 @@ cacheline_alloc(struct i915_timeline_hwsp *hwsp, unsigned int cacheline)
cl->hwsp = hwsp;
cl->vaddr = page_pack_bits(vaddr, cacheline);
- i915_active_init(hwsp_to_i915(hwsp), &cl->active,
- __cacheline_active, __cacheline_retire);
+ i915_active_init(&cl->active, __cacheline_active, __cacheline_retire);
return cl;
}
@@ -264,7 +263,7 @@ int i915_timeline_init(struct drm_i915_private *i915,
mutex_init(&timeline->mutex);
- INIT_ACTIVE_REQUEST(&timeline->last_request);
+ INIT_ACTIVE_FENCE(&timeline->last_request);
INIT_LIST_HEAD(&timeline->requests);
i915_syncmap_init(&timeline->sync);
@@ -461,7 +460,7 @@ __i915_timeline_get_seqno(struct i915_timeline *tl,
* all writes into the cacheline from previous requests are complete.
*/
err = i915_active_ref(&tl->hwsp_cacheline->active,
- tl->fence_context, rq);
+ tl->fence_context, &rq->fence);
if (err)
goto err_cacheline;
@@ -512,7 +511,7 @@ int i915_timeline_get_seqno(struct i915_timeline *tl,
static int cacheline_ref(struct i915_timeline_cacheline *cl,
struct i915_request *rq)
{
- return i915_active_ref(&cl->active, rq->fence.context, rq);
+ return i915_active_ref(&cl->active, rq->fence.context, &rq->fence);
}
int i915_timeline_read_hwsp(struct i915_request *from,
diff --git a/drivers/gpu/drm/i915/i915_timeline_types.h b/drivers/gpu/drm/i915/i915_timeline_types.h
index fce5cb4f1090..5af6d185d70c 100644
--- a/drivers/gpu/drm/i915/i915_timeline_types.h
+++ b/drivers/gpu/drm/i915/i915_timeline_types.h
@@ -45,7 +45,7 @@ struct i915_timeline {
* the request using i915_active_request_get_request_rcu(), or hold the
* struct_mutex.
*/
- struct i915_active_request last_request;
+ struct i915_active_fence last_request;
/**
* We track the most recent seqno that we wait on in every context so
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 9722269410b7..594cab86e50c 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -116,8 +116,7 @@ vma_create(struct drm_i915_gem_object *obj,
vma->size = obj->base.size;
vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
- i915_active_init(vm->i915, &vma->active,
- __i915_vma_active, __i915_vma_retire);
+ i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire);
INIT_LIST_HEAD(&vma->closed_link);
@@ -911,7 +910,7 @@ int i915_vma_move_to_active(struct i915_vma *vma,
* add the active reference first and queue for it to be dropped
* *last*.
*/
- err = i915_active_ref(&vma->active, rq->fence.context, rq);
+ err = i915_active_ref(&vma->active, rq->fence.context, &rq->fence);
if (unlikely(err))
return err;
@@ -922,7 +921,7 @@ int i915_vma_move_to_active(struct i915_vma *vma,
if (intel_frontbuffer_invalidate(obj->frontbuffer, ORIGIN_CS))
i915_active_ref(&obj->frontbuffer->write,
rq->fence.context,
- rq);
+ &rq->fence);
obj->read_domains = 0;
}
@@ -941,32 +940,11 @@ int i915_vma_unbind(struct i915_vma *vma)
lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
- /*
- * First wait upon any activity as retiring the request may
- * have side-effects such as unpinning or even unbinding this vma.
- */
- might_sleep();
- if (i915_vma_is_active(vma)) {
- /*
- * When a closed VMA is retired, it is unbound - eek.
- * In order to prevent it from being recursively closed,
- * take a pin on the vma so that the second unbind is
- * aborted.
- *
- * Even more scary is that the retire callback may free
- * the object (last active vma). To prevent the explosion
- * we defer the actual object free to a worker that can
- * only proceed once it acquires the struct_mutex (which
- * we currently hold, therefore it cannot free this object
- * before we are finished).
- */
- __i915_vma_pin(vma);
- ret = i915_active_wait(&vma->active);
- __i915_vma_unpin(vma);
- if (ret)
- return ret;
- }
+ ret = i915_active_wait(&vma->active);
+ if (ret)
+ return ret;
+ GEM_BUG_ON(i915_vma_is_active(vma));
if (i915_vma_is_pinned(vma)) {
vma_print_allocator(vma, "is pinned");
return -EBUSY;
diff --git a/drivers/gpu/drm/i915/selftests/i915_active.c b/drivers/gpu/drm/i915/selftests/i915_active.c
index 84fce379c0de..4384ad51d6e4 100644
--- a/drivers/gpu/drm/i915/selftests/i915_active.c
+++ b/drivers/gpu/drm/i915/selftests/i915_active.c
@@ -67,7 +67,7 @@ static struct live_active *__live_alloc(struct drm_i915_private *i915)
return NULL;
kref_init(&active->ref);
- i915_active_init(i915, &active->base, __live_active, __live_retire);
+ i915_active_init(&active->base, __live_active, __live_retire);
return active;
}
@@ -110,7 +110,8 @@ __live_active_setup(struct drm_i915_private *i915)
GFP_KERNEL);
if (err >= 0)
err = i915_active_ref(&active->base,
- rq->fence.context, rq);
+ rq->fence.context,
+ &rq->fence);
i915_request_add(rq);
if (err) {
pr_err("Failed to track active ref!\n");
@@ -146,19 +147,13 @@ static int live_active_wait(void *arg)
{
struct drm_i915_private *i915 = arg;
struct live_active *active;
- intel_wakeref_t wakeref;
int err = 0;
/* Check that we get a callback when requests retire upon waiting */
- mutex_lock(&i915->drm.struct_mutex);
- wakeref = intel_runtime_pm_get(&i915->runtime_pm);
-
active = __live_active_setup(i915);
- if (IS_ERR(active)) {
- err = PTR_ERR(active);
- goto err;
- }
+ if (IS_ERR(active))
+ return PTR_ERR(active);
i915_active_wait(&active->base);
if (!active->retired) {
@@ -168,11 +163,9 @@ static int live_active_wait(void *arg)
__live_put(active);
+ mutex_lock(&i915->drm.struct_mutex);
if (igt_flush_test(i915, I915_WAIT_LOCKED))
err = -EIO;
-
-err:
- intel_runtime_pm_put(&i915->runtime_pm, wakeref);
mutex_unlock(&i915->drm.struct_mutex);
return err;
@@ -182,23 +175,19 @@ static int live_active_retire(void *arg)
{
struct drm_i915_private *i915 = arg;
struct live_active *active;
- intel_wakeref_t wakeref;
int err = 0;
/* Check that we get a callback when requests are indirectly retired */
- mutex_lock(&i915->drm.struct_mutex);
- wakeref = intel_runtime_pm_get(&i915->runtime_pm);
-
active = __live_active_setup(i915);
- if (IS_ERR(active)) {
- err = PTR_ERR(active);
- goto err;
- }
+ if (IS_ERR(active))
+ return PTR_ERR(active);
/* waits for & retires all requests */
+ mutex_lock(&i915->drm.struct_mutex);
if (igt_flush_test(i915, I915_WAIT_LOCKED))
err = -EIO;
+ mutex_unlock(&i915->drm.struct_mutex);
if (!active->retired) {
pr_err("i915_active not retired after flushing!\n");
@@ -207,10 +196,6 @@ static int live_active_retire(void *arg)
__live_put(active);
-err:
- intel_runtime_pm_put(&i915->runtime_pm, wakeref);
- mutex_unlock(&i915->drm.struct_mutex);
-
return err;
}
diff --git a/drivers/gpu/drm/i915/selftests/mock_timeline.c b/drivers/gpu/drm/i915/selftests/mock_timeline.c
index 65b52be23d42..024de718f66f 100644
--- a/drivers/gpu/drm/i915/selftests/mock_timeline.c
+++ b/drivers/gpu/drm/i915/selftests/mock_timeline.c
@@ -15,7 +15,7 @@ void mock_timeline_init(struct i915_timeline *timeline, u64 context)
mutex_init(&timeline->mutex);
- INIT_ACTIVE_REQUEST(&timeline->last_request);
+ INIT_ACTIVE_FENCE(&timeline->last_request);
INIT_LIST_HEAD(&timeline->requests);
i915_syncmap_init(&timeline->sync);
--
2.20.1
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