[PATCH 08/24] drm/radeon: add biggest hole tracking and wakequeue to the sa v4

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From: Christian König <deathsimple@xxxxxxxxxxx>

With that in place clients are automatically blocking
until their memory request can be handled.

v2: block only if the memory request can't be satisfied
    in the first try, the first version actually lacked
    a night of sleep.

v3: make blocking optional, update comments and fix
    another bug with biggest hole tracking.

v4: drop debugfs portion

Signed-off-by: Christian König <deathsimple@xxxxxxxxxxx>
---
 drivers/gpu/drm/radeon/radeon.h        |    5 +-
 drivers/gpu/drm/radeon/radeon_gart.c   |    2 +-
 drivers/gpu/drm/radeon/radeon_object.h |    2 +-
 drivers/gpu/drm/radeon/radeon_ring.c   |   20 ++--
 drivers/gpu/drm/radeon/radeon_sa.c     |  178 ++++++++++++++++++++++----------
 5 files changed, 138 insertions(+), 69 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 1aefbd9..415a496 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -381,17 +381,16 @@ struct radeon_bo_list {
  * alignment).
  */
 struct radeon_sa_manager {
-	spinlock_t		lock;
+	wait_queue_head_t	queue;
 	struct radeon_bo	*bo;
 	struct list_head	sa_bo;
 	unsigned		size;
+	struct list_head	*biggest_hole;
 	uint64_t		gpu_addr;
 	void			*cpu_ptr;
 	uint32_t		domain;
 };
 
-struct radeon_sa_bo;
-
 /* sub-allocation buffer */
 struct radeon_sa_bo {
 	struct list_head		list;
diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
index c58a036..7af4ff9 100644
--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -395,7 +395,7 @@ int radeon_vm_bind(struct radeon_device *rdev, struct radeon_vm *vm)
 retry:
 	r = radeon_sa_bo_new(rdev, &rdev->vm_manager.sa_manager, &vm->sa_bo,
 			     RADEON_GPU_PAGE_ALIGN(vm->last_pfn * 8),
-			     RADEON_GPU_PAGE_SIZE);
+			     RADEON_GPU_PAGE_SIZE, false);
 	if (r) {
 		if (list_empty(&rdev->vm_manager.lru_vm)) {
 			return r;
diff --git a/drivers/gpu/drm/radeon/radeon_object.h b/drivers/gpu/drm/radeon/radeon_object.h
index f9104be..a181c2f 100644
--- a/drivers/gpu/drm/radeon/radeon_object.h
+++ b/drivers/gpu/drm/radeon/radeon_object.h
@@ -158,7 +158,7 @@ extern int radeon_sa_bo_manager_suspend(struct radeon_device *rdev,
 extern int radeon_sa_bo_new(struct radeon_device *rdev,
 			    struct radeon_sa_manager *sa_manager,
 			    struct radeon_sa_bo *sa_bo,
-			    unsigned size, unsigned align);
+			    unsigned size, unsigned align, bool block);
 extern void radeon_sa_bo_free(struct radeon_device *rdev,
 			      struct radeon_sa_bo *sa_bo);
 
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index e394131..b06e04f 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -121,7 +121,7 @@ retry:
 		if (rdev->ib_pool.ibs[idx].fence == NULL) {
 			r = radeon_sa_bo_new(rdev, &rdev->ib_pool.sa_manager,
 					     &rdev->ib_pool.ibs[idx].sa_bo,
-					     size, 256);
+					     size, 256, false);
 			if (!r) {
 				*ib = &rdev->ib_pool.ibs[idx];
 				(*ib)->ptr = rdev->ib_pool.sa_manager.cpu_ptr;
@@ -202,10 +202,16 @@ int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
 
 int radeon_ib_pool_init(struct radeon_device *rdev)
 {
-	struct radeon_sa_manager tmp;
 	int i, r;
 
-	r = radeon_sa_bo_manager_init(rdev, &tmp,
+	radeon_mutex_lock(&rdev->ib_pool.mutex);
+	if (rdev->ib_pool.ready) {
+		return 0;
+	}
+	rdev->ib_pool.ready = true;
+	radeon_mutex_unlock(&rdev->ib_pool.mutex);
+
+	r = radeon_sa_bo_manager_init(rdev, &rdev->ib_pool.sa_manager,
 				      RADEON_IB_POOL_SIZE*64*1024,
 				      RADEON_GEM_DOMAIN_GTT);
 	if (r) {
@@ -213,14 +219,6 @@ int radeon_ib_pool_init(struct radeon_device *rdev)
 	}
 
 	radeon_mutex_lock(&rdev->ib_pool.mutex);
-	if (rdev->ib_pool.ready) {
-		radeon_mutex_unlock(&rdev->ib_pool.mutex);
-		radeon_sa_bo_manager_fini(rdev, &tmp);
-		return 0;
-	}
-
-	rdev->ib_pool.sa_manager = tmp;
-	INIT_LIST_HEAD(&rdev->ib_pool.sa_manager.sa_bo);
 	for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
 		rdev->ib_pool.ibs[i].fence = NULL;
 		rdev->ib_pool.ibs[i].idx = i;
diff --git a/drivers/gpu/drm/radeon/radeon_sa.c b/drivers/gpu/drm/radeon/radeon_sa.c
index 4ce5c51..3212293 100644
--- a/drivers/gpu/drm/radeon/radeon_sa.c
+++ b/drivers/gpu/drm/radeon/radeon_sa.c
@@ -26,6 +26,7 @@
 /*
  * Authors:
  *    Jerome Glisse <glisse@xxxxxxxxxxxxxxx>
+ *    Christian König <christian.koenig@xxxxxxx>
  */
 #include "drmP.h"
 #include "drm.h"
@@ -37,9 +38,10 @@ int radeon_sa_bo_manager_init(struct radeon_device *rdev,
 {
 	int r;
 
-	spin_lock_init(&sa_manager->lock);
+	init_waitqueue_head(&sa_manager->queue);
 	sa_manager->bo = NULL;
 	sa_manager->size = size;
+	sa_manager->biggest_hole = &sa_manager->sa_bo;
 	sa_manager->domain = domain;
 	INIT_LIST_HEAD(&sa_manager->sa_bo);
 
@@ -58,6 +60,7 @@ void radeon_sa_bo_manager_fini(struct radeon_device *rdev,
 {
 	struct radeon_sa_bo *sa_bo, *tmp;
 
+	wake_up_all(&sa_manager->queue);
 	if (!list_empty(&sa_manager->sa_bo)) {
 		dev_err(rdev->dev, "sa_manager is not empty, clearing anyway\n");
 	}
@@ -114,81 +117,150 @@ int radeon_sa_bo_manager_suspend(struct radeon_device *rdev,
 	return r;
 }
 
+static inline unsigned radeon_sa_bo_hole_start(struct radeon_sa_manager *m,
+					       struct list_head *entry)
+{
+	struct radeon_sa_bo *sa_bo;
+
+	if (entry == &m->sa_bo)
+		return 0;
+
+	sa_bo = list_entry(entry, struct radeon_sa_bo, list);
+	return sa_bo->offset + sa_bo->size;
+}
+
+static inline unsigned radeon_sa_bo_hole_end(struct radeon_sa_manager *m,
+					     struct list_head *entry)
+{
+	if (entry->next == &m->sa_bo)
+		return m->size;
+
+	return list_entry(entry->next, struct radeon_sa_bo, list)->offset;
+}
+
+static inline unsigned radeon_sa_bo_min_free(struct radeon_sa_manager *m,
+					     unsigned align)
+{
+	unsigned start, end, wasted;
+	start = radeon_sa_bo_hole_start(m, m->biggest_hole);
+	wasted = start % align;
+	if (wasted)
+		start += align - wasted;
+
+	end = radeon_sa_bo_hole_end(m, m->biggest_hole);
+	return start < end ? end - start : 0;
+}
+
 /*
  * Principe is simple, we keep a list of sub allocation in offset
  * order (first entry has offset == 0, last entry has the highest
  * offset).
  *
- * When allocating new object we first check if there is room at
- * the end total_size - (last_object_offset + last_object_size) >=
- * alloc_size. If so we allocate new object there.
- *
- * When there is not enough room at the end, we start waiting for
- * each sub object until we reach object_offset+object_size >=
- * alloc_size, this object then become the sub object we return.
+ * When allocating new objects we start checking at what's currently
+ * assumed to be the biggest hole, if that's not big enough we continue
+ * searching the list until we find something big enough or reach the
+ * biggest hole again. If the later happen we optionally block for the
+ * biggest hole to increase in size.
  *
- * Alignment can't be bigger than page size
  */
 int radeon_sa_bo_new(struct radeon_device *rdev,
 		     struct radeon_sa_manager *sa_manager,
 		     struct radeon_sa_bo *sa_bo,
-		     unsigned size, unsigned align)
+		     unsigned size, unsigned align, bool block)
 {
-	struct radeon_sa_bo *tmp;
-	struct list_head *head;
-	unsigned offset = 0, wasted = 0;
-	unsigned long flags;
+	struct list_head *head, *curr, *hole;
+	unsigned start, currsize, wasted, holesize;
+	int r;
 
 	BUG_ON(align > RADEON_GPU_PAGE_SIZE);
 	BUG_ON(size > sa_manager->size);
-	spin_lock_irqsave(&sa_manager->lock, flags);
 
-	/* no one ? */
-	if (list_empty(&sa_manager->sa_bo)) {
-		head = &sa_manager->sa_bo;
-		goto out;
-	}
+	spin_lock_irq(&sa_manager->queue.lock);
+
+	do {
+		curr = head = hole = sa_manager->biggest_hole;
+		holesize = radeon_sa_bo_min_free(sa_manager, 1);
+		do {
+			start = radeon_sa_bo_hole_start(sa_manager, curr);
+			currsize = radeon_sa_bo_hole_end(sa_manager, curr) - start;
+
+			wasted = start % align;
+			if (wasted) {
+				wasted = align - wasted;
+			}
+
+			/* room after current big enough ? */
+			if (currsize >= (size + wasted)) {
+				sa_bo->manager = sa_manager;
+				sa_bo->offset = start + wasted;
+				sa_bo->size = size;
+				list_add(&sa_bo->list, curr);
+
+				/* consider the space left after the newly
+				   added sa_bo as the biggest hole */
+				currsize -= (size + wasted);
+				if (hole == sa_bo->list.prev || holesize < currsize) {
+					hole = &sa_bo->list;
+				}
+
+				if (sa_manager->biggest_hole != hole) {
+					sa_manager->biggest_hole = hole;
+					wake_up_locked(&sa_manager->queue);
+				}
+				spin_unlock_irq(&sa_manager->queue.lock);
+				return 0;
+			}
+
+			if (holesize < currsize) {
+				hole = curr;
+				holesize = currsize;
+			}
+
+			curr = curr->next;
+		} while (curr != head);
 
-	/* look for a hole big enough */
-	list_for_each_entry(tmp, &sa_manager->sa_bo, list) {
-		/* room before this object ? */
-		if (offset < tmp->offset && (tmp->offset - offset) >= size) {
-			head = tmp->list.prev;
-			goto out;
+		if (sa_manager->biggest_hole != hole) {
+			sa_manager->biggest_hole = hole;
 		}
-		offset = tmp->offset + tmp->size;
-		wasted = offset % align;
-		if (wasted) {
-			offset += align - wasted;
+
+		if (block) {
+			/* failed to find something big enough, wait
+			   for the biggest hole to increase in size */
+			r = wait_event_interruptible_locked_irq(sa_manager->queue,
+				radeon_sa_bo_min_free(sa_manager, align) >= size
+			);
+			if (r) {
+				spin_unlock_irq(&sa_manager->queue.lock);
+				return r;
+			}
 		}
-	}
-	/* room at the end ? */
-	head = sa_manager->sa_bo.prev;
-	tmp = list_entry(head, struct radeon_sa_bo, list);
-	offset = tmp->offset + tmp->size;
-	wasted = offset % align;
-	if (wasted) {
-		offset += wasted = align - wasted;
-	}
-	if ((sa_manager->size - offset) < size) {
-		/* failed to find somethings big enough */
-		spin_unlock_irqrestore(&sa_manager->lock, flags);
-		return -ENOMEM;
-	}
+	} while (block);
+	spin_unlock_irq(&sa_manager->queue.lock);
 
-out:
-	sa_bo->manager = sa_manager;
-	sa_bo->offset = offset;
-	sa_bo->size = size;
-	list_add(&sa_bo->list, head);
-	spin_unlock_irqrestore(&sa_manager->lock, flags);
-	return 0;
+	return -ENOMEM;
 }
 
 void radeon_sa_bo_free(struct radeon_device *rdev, struct radeon_sa_bo *sa_bo)
 {
+	struct radeon_sa_manager *sa_manager = sa_bo->manager;
+	unsigned bsize, fsize;
 	unsigned long flags;
-	spin_lock_irqsave(&sa_bo->manager->lock, flags);
+
+	spin_lock_irqsave(&sa_manager->queue.lock, flags);
+	if (&sa_bo->list == sa_manager->biggest_hole ||
+	    sa_bo->list.prev == sa_manager->biggest_hole) {
+
+		sa_manager->biggest_hole = sa_bo->list.prev;
+		wake_up_locked(&sa_manager->queue);
+	} else {
+		bsize = radeon_sa_bo_min_free(sa_manager, 1);
+		fsize = radeon_sa_bo_hole_start(sa_manager, sa_bo->list.prev);
+		fsize = radeon_sa_bo_hole_end(sa_manager, &sa_bo->list) - fsize;
+		if (fsize > bsize) {
+			sa_manager->biggest_hole = sa_bo->list.prev;
+			wake_up_locked(&sa_manager->queue);
+		}
+	}
 	list_del_init(&sa_bo->list);
-	spin_unlock_irqrestore(&sa_bo->manager->lock, flags);
+	spin_unlock_irqrestore(&sa_manager->queue.lock, flags);
 }
-- 
1.7.7.6

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