From f1e8c67123cf171e2b0357e885e426328b241d7d Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 29 Jun 2017 22:12:53 +0100 Subject: [PATCH] dma-buf/sw-sync: Use an rbtree to sort fences in the timeline Reduce the list iteration when incrementing the timeline by storing the fences in increasing order. v2: Prevent spinlock recursion on free during create v3: Fixup rebase conflict inside comments that escaped the compiler. Signed-off-by: Chris Wilson Cc: Sumit Semwal Cc: Sean Paul Cc: Gustavo Padovan Reviewed-by: Sean Paul Signed-off-by: Gustavo Padovan Link: http://patchwork.freedesktop.org/patch/msgid/20170629211253.22766-1-chris@chris-wilson.co.uk --- drivers/dma-buf/sw_sync.c | 49 +++++++++++++++++++++++++++++++----- drivers/dma-buf/sync_debug.h | 5 ++++ 2 files changed, 48 insertions(+), 6 deletions(-) diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c index f20d18c421a3..af1bc84802e5 100644 --- a/drivers/dma-buf/sw_sync.c +++ b/drivers/dma-buf/sw_sync.c @@ -96,6 +96,7 @@ static struct sync_timeline *sync_timeline_create(const char *name) obj->context = dma_fence_context_alloc(1); strlcpy(obj->name, name, sizeof(obj->name)); + obj->pt_tree = RB_ROOT; INIT_LIST_HEAD(&obj->pt_list); spin_lock_init(&obj->lock); @@ -142,9 +143,13 @@ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc) obj->value += inc; - list_for_each_entry_safe(pt, next, &obj->pt_list, link) - if (dma_fence_is_signaled_locked(&pt->base)) - list_del_init(&pt->link); + list_for_each_entry_safe(pt, next, &obj->pt_list, link) { + if (!dma_fence_is_signaled_locked(&pt->base)) + break; + + list_del_init(&pt->link); + rb_erase(&pt->node, &obj->pt_tree); + } spin_unlock_irq(&obj->lock); } @@ -174,8 +179,38 @@ static struct sync_pt *sync_pt_create(struct sync_timeline *obj, INIT_LIST_HEAD(&pt->link); spin_lock_irq(&obj->lock); - if (!dma_fence_is_signaled_locked(&pt->base)) - list_add_tail(&pt->link, &obj->pt_list); + if (!dma_fence_is_signaled_locked(&pt->base)) { + struct rb_node **p = &obj->pt_tree.rb_node; + struct rb_node *parent = NULL; + + while (*p) { + struct sync_pt *other; + int cmp; + + parent = *p; + other = rb_entry(parent, typeof(*pt), node); + cmp = value - other->base.seqno; + if (cmp > 0) { + p = &parent->rb_right; + } else if (cmp < 0) { + p = &parent->rb_left; + } else { + if (dma_fence_get_rcu(&other->base)) { + dma_fence_put(&pt->base); + pt = other; + goto unlock; + } + p = &parent->rb_left; + } + } + rb_link_node(&pt->node, parent, p); + rb_insert_color(&pt->node, &obj->pt_tree); + + parent = rb_next(&pt->node); + list_add_tail(&pt->link, + parent ? &rb_entry(parent, typeof(*pt), node)->link : &obj->pt_list); + } +unlock: spin_unlock_irq(&obj->lock); return pt; @@ -202,8 +237,10 @@ static void timeline_fence_release(struct dma_fence *fence) unsigned long flags; spin_lock_irqsave(fence->lock, flags); - if (!list_empty(&pt->link)) + if (!list_empty(&pt->link)) { list_del(&pt->link); + rb_erase(&pt->node, &parent->pt_tree); + } spin_unlock_irqrestore(fence->lock, flags); } diff --git a/drivers/dma-buf/sync_debug.h b/drivers/dma-buf/sync_debug.h index 6a2a8e69a7d0..d615a89f774c 100644 --- a/drivers/dma-buf/sync_debug.h +++ b/drivers/dma-buf/sync_debug.h @@ -14,6 +14,7 @@ #define _LINUX_SYNC_H #include +#include #include #include @@ -25,6 +26,7 @@ * @kref: reference count on fence. * @name: name of the sync_timeline. Useful for debugging * @lock: lock protecting @pt_list and @value + * @pt_tree: rbtree of active (unsignaled/errored) sync_pts * @pt_list: list of active (unsignaled/errored) sync_pts * @sync_timeline_list: membership in global sync_timeline_list */ @@ -36,6 +38,7 @@ struct sync_timeline { u64 context; int value; + struct rb_root pt_tree; struct list_head pt_list; spinlock_t lock; @@ -51,10 +54,12 @@ static inline struct sync_timeline *dma_fence_parent(struct dma_fence *fence) * struct sync_pt - sync_pt object * @base: base fence object * @link: link on the sync timeline's list + * @node: node in the sync timeline's tree */ struct sync_pt { struct dma_fence base; struct list_head link; + struct rb_node node; }; #ifdef CONFIG_SW_SYNC -- GitLab