[PATCH 17/30] drm/i915: Export a preallocate variant of i915_active_acquire()
Chris Wilson
chris at chris-wilson.co.uk
Thu Jul 9 02:56:13 UTC 2020
Sometimes we have to be very careful not to allocate underneath a mutex
(or spinlock) and yet still want to track activity. Enter
i915_active_acquire_for_context(). This raises the activity counter on
i915_active prior to use and ensures that the fence-tree contains a slot
for the context.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 6 +-
drivers/gpu/drm/i915/gt/intel_timeline.c | 4 +-
drivers/gpu/drm/i915/i915_active.c | 105 +++++++++++++++---
drivers/gpu/drm/i915/i915_active.h | 12 +-
4 files changed, 104 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 024be05aa30d..03f3588ff628 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -1804,7 +1804,7 @@ __parser_mark_active(struct i915_vma *vma,
{
struct intel_gt_buffer_pool_node *node = vma->private;
- return i915_active_ref(&node->active, tl, fence);
+ return i915_active_ref(&node->active, tl->fence_context, fence);
}
static int
@@ -1812,7 +1812,9 @@ parser_mark_active(struct eb_parse_work *pw, struct intel_timeline *tl)
{
int err;
- err = i915_active_ref(&pw->batch->active, tl, &pw->base.dma);
+ err = i915_active_ref(&pw->batch->active,
+ tl->fence_context,
+ &pw->base.dma);
if (err)
return err;
diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c
index 4546284fede1..e4a5326633b8 100644
--- a/drivers/gpu/drm/i915/gt/intel_timeline.c
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.c
@@ -479,7 +479,9 @@ __intel_timeline_get_seqno(struct intel_timeline *tl,
* free it after the current request is retired, which ensures that
* all writes into the cacheline from previous requests are complete.
*/
- err = i915_active_ref(&tl->hwsp_cacheline->active, tl, &rq->fence);
+ err = i915_active_ref(&tl->hwsp_cacheline->active,
+ tl->fence_context,
+ &rq->fence);
if (err)
goto err_cacheline;
diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c
index ea7af483bc3e..569cc4563006 100644
--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -225,12 +225,41 @@ excl_retire(struct dma_fence *fence, struct dma_fence_cb *cb)
active_retire(container_of(cb, struct i915_active, excl.cb));
}
+static struct i915_active_node *
+__active_lookup(struct i915_active *ref, u64 idx)
+{
+ struct i915_active_node *node;
+ struct rb_node *p;
+
+ node = READ_ONCE(ref->cache);
+ if (node->timeline == idx || !cmpxchg(&node->timeline, 0, idx))
+ return node;
+
+ spin_lock_irq(&ref->tree_lock);
+ GEM_BUG_ON(i915_active_is_idle(ref));
+ p = ref->tree.rb_node;
+ while (p) {
+ node = rb_entry(p, typeof(*node), node);
+ if (node->timeline < idx) {
+ p = p->rb_right;
+ } else if (node->timeline > idx) {
+ p = p->rb_left;
+ } else {
+ ref->cache = node;
+ spin_unlock_irq(&ref->tree_lock);
+ return node;
+ }
+ }
+ spin_unlock_irq(&ref->tree_lock);
+
+ return NULL;
+}
+
static struct i915_active_fence *
-active_instance(struct i915_active *ref, struct intel_timeline *tl)
+active_instance(struct i915_active *ref, u64 idx)
{
struct i915_active_node *node, *prealloc;
struct rb_node **p, *parent;
- u64 idx = tl->fence_context;
/*
* We track the most recently used timeline to skip a rbtree search
@@ -239,8 +268,8 @@ active_instance(struct i915_active *ref, struct intel_timeline *tl)
* after the previous activity has been retired, or if it matches the
* current timeline.
*/
- node = READ_ONCE(ref->cache);
- if (node->timeline == idx || !cmpxchg(&node->timeline, 0, idx))
+ node = __active_lookup(ref, idx);
+ if (node)
return &node->base;
/* Preallocate a replacement, just in case */
@@ -369,21 +398,17 @@ __active_del_barrier(struct i915_active *ref, struct i915_active_node *node)
return ____active_del_barrier(ref, node, barrier_to_engine(node));
}
-int i915_active_ref(struct i915_active *ref,
- struct intel_timeline *tl,
- struct dma_fence *fence)
+int i915_active_ref(struct i915_active *ref, u64 idx, struct dma_fence *fence)
{
struct i915_active_fence *active;
int err;
- lockdep_assert_held(&tl->mutex);
-
/* Prevent reaping in case we malloc/wait while building the tree */
err = i915_active_acquire(ref);
if (err)
return err;
- active = active_instance(ref, tl);
+ active = active_instance(ref, idx);
if (!active) {
err = -ENOMEM;
goto out;
@@ -400,32 +425,62 @@ int i915_active_ref(struct i915_active *ref,
atomic_dec(&ref->count);
}
if (!__i915_active_fence_set(active, fence))
- atomic_inc(&ref->count);
+ __i915_active_acquire(ref);
out:
i915_active_release(ref);
return err;
}
-struct dma_fence *
-i915_active_set_exclusive(struct i915_active *ref, struct dma_fence *f)
+static struct dma_fence *
+__i915_active_set_fence(struct i915_active *ref,
+ struct i915_active_fence *active,
+ struct dma_fence *fence)
{
struct dma_fence *prev;
/* We expect the caller to manage the exclusive timeline ordering */
GEM_BUG_ON(i915_active_is_idle(ref));
+ if (is_barrier(active)) { /* proto-node used by our idle barrier */
+ /*
+ * This request is on the kernel_context timeline, and so
+ * we can use it to substitute for the pending idle-barrer
+ * request that we want to emit on the kernel_context.
+ */
+ __active_del_barrier(ref, node_from_active(active));
+ RCU_INIT_POINTER(active->fence, fence);
+ return NULL;
+ }
+
rcu_read_lock();
- prev = __i915_active_fence_set(&ref->excl, f);
+ prev = __i915_active_fence_set(active, fence);
if (prev)
prev = dma_fence_get_rcu(prev);
else
- atomic_inc(&ref->count);
+ __i915_active_acquire(ref);
rcu_read_unlock();
return prev;
}
+struct dma_fence *
+__i915_active_ref(struct i915_active *ref, u64 idx, struct dma_fence *fence)
+{
+ GEM_BUG_ON(i915_active_is_idle(ref));
+
+ return __i915_active_set_fence(ref,
+ &__active_lookup(ref, idx)->base,
+ fence);
+}
+
+struct dma_fence *
+i915_active_set_exclusive(struct i915_active *ref, struct dma_fence *f)
+{
+ /* We expect the caller to manage the exclusive timeline ordering */
+ return __i915_active_set_fence(ref, &ref->excl, f);
+}
+
bool i915_active_acquire_if_busy(struct i915_active *ref)
{
debug_active_assert(ref);
@@ -466,6 +521,24 @@ int i915_active_acquire(struct i915_active *ref)
return err;
}
+int i915_active_acquire_for_context(struct i915_active *ref, u64 idx)
+{
+ struct i915_active_fence *active;
+ int err;
+
+ err = i915_active_acquire(ref);
+ if (err)
+ return err;
+
+ active = active_instance(ref, idx);
+ if (!active) {
+ i915_active_release(ref);
+ return -ENOMEM;
+ }
+
+ return 0; /* return with active ref */
+}
+
void i915_active_release(struct i915_active *ref)
{
debug_active_assert(ref);
@@ -826,7 +899,7 @@ int i915_active_acquire_preallocate_barrier(struct i915_active *ref,
*/
RCU_INIT_POINTER(node->base.fence, ERR_PTR(-EAGAIN));
node->base.cb.node.prev = (void *)engine;
- atomic_inc(&ref->count);
+ __i915_active_acquire(ref);
}
GEM_BUG_ON(rcu_access_pointer(node->base.fence) != ERR_PTR(-EAGAIN));
diff --git a/drivers/gpu/drm/i915/i915_active.h b/drivers/gpu/drm/i915/i915_active.h
index cf4058150966..73ded3c52a04 100644
--- a/drivers/gpu/drm/i915/i915_active.h
+++ b/drivers/gpu/drm/i915/i915_active.h
@@ -163,14 +163,16 @@ void __i915_active_init(struct i915_active *ref,
__i915_active_init(ref, active, retire, &__mkey, &__wkey); \
} while (0)
-int i915_active_ref(struct i915_active *ref,
- struct intel_timeline *tl,
- struct dma_fence *fence);
+struct dma_fence *
+__i915_active_ref(struct i915_active *ref, u64 idx, struct dma_fence *fence);
+int i915_active_ref(struct i915_active *ref, u64 idx, struct dma_fence *fence);
static inline int
i915_active_add_request(struct i915_active *ref, struct i915_request *rq)
{
- return i915_active_ref(ref, i915_request_timeline(rq), &rq->fence);
+ return i915_active_ref(ref,
+ i915_request_timeline(rq)->fence_context,
+ &rq->fence);
}
struct dma_fence *
@@ -198,7 +200,9 @@ int i915_request_await_active(struct i915_request *rq,
#define I915_ACTIVE_AWAIT_BARRIER BIT(2)
int i915_active_acquire(struct i915_active *ref);
+int i915_active_acquire_for_context(struct i915_active *ref, u64 idx);
bool i915_active_acquire_if_busy(struct i915_active *ref);
+
void i915_active_release(struct i915_active *ref);
static inline void __i915_active_acquire(struct i915_active *ref)
--
2.20.1
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