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![Chris Wilson](/assets/img/avatar_default.png)
By placing our idle-barriers in the i915_active fence tree, we expose those for reuse by other components that are issuing requests along the kernel_context. Reusing the proto-barrier active_node is perfectly fine as the new request implies a context-switch, and so an opportune point to run the idle-barrier. However, the proto-barrier is not equivalent to a normal active_node and care must be taken to avoid dereferencing the ERR_PTR used as its request marker. v2: Comment the more egregious cheek v3: A glossary! Reported-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Fixes:ce476c80b8
("drm/i915: Keep contexts pinned until after the next kernel context switch") Fixes:a9877da2d6
("drm/i915/oa: Reconfigure contexts on the fly") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190802100015.1281-1-chris@chris-wilson.co.uk
728 lines
17 KiB
C
728 lines
17 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2019 Intel Corporation
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*/
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#include <linux/debugobjects.h>
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#include "gt/intel_engine_pm.h"
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#include "i915_drv.h"
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#include "i915_active.h"
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#include "i915_globals.h"
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#define BKL(ref) (&(ref)->i915->drm.struct_mutex)
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/*
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* Active refs memory management
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*
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* To be more economical with memory, we reap all the i915_active trees as
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* they idle (when we know the active requests are inactive) and allocate the
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* nodes from a local slab cache to hopefully reduce the fragmentation.
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*/
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static struct i915_global_active {
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struct i915_global base;
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struct kmem_cache *slab_cache;
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} global;
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struct active_node {
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struct i915_active_request base;
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struct i915_active *ref;
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struct rb_node node;
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u64 timeline;
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};
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static inline struct active_node *
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node_from_active(struct i915_active_request *active)
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{
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return container_of(active, struct active_node, base);
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}
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#define take_preallocated_barriers(x) llist_del_all(&(x)->preallocated_barriers)
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static inline bool is_barrier(const struct i915_active_request *active)
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{
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return IS_ERR(rcu_access_pointer(active->request));
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}
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static inline struct llist_node *barrier_to_ll(struct active_node *node)
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{
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GEM_BUG_ON(!is_barrier(&node->base));
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return (struct llist_node *)&node->base.link;
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}
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static inline struct intel_engine_cs *
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barrier_to_engine(struct active_node *node)
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{
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GEM_BUG_ON(!is_barrier(&node->base));
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return (struct intel_engine_cs *)node->base.link.prev;
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}
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static inline struct active_node *barrier_from_ll(struct llist_node *x)
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{
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return container_of((struct list_head *)x,
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struct active_node, base.link);
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}
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#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) && IS_ENABLED(CONFIG_DEBUG_OBJECTS)
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static void *active_debug_hint(void *addr)
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{
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struct i915_active *ref = addr;
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return (void *)ref->active ?: (void *)ref->retire ?: (void *)ref;
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}
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static struct debug_obj_descr active_debug_desc = {
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.name = "i915_active",
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.debug_hint = active_debug_hint,
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};
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static void debug_active_init(struct i915_active *ref)
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{
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debug_object_init(ref, &active_debug_desc);
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}
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static void debug_active_activate(struct i915_active *ref)
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{
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debug_object_activate(ref, &active_debug_desc);
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}
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static void debug_active_deactivate(struct i915_active *ref)
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{
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debug_object_deactivate(ref, &active_debug_desc);
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}
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static void debug_active_fini(struct i915_active *ref)
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{
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debug_object_free(ref, &active_debug_desc);
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}
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static void debug_active_assert(struct i915_active *ref)
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{
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debug_object_assert_init(ref, &active_debug_desc);
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}
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#else
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static inline void debug_active_init(struct i915_active *ref) { }
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static inline void debug_active_activate(struct i915_active *ref) { }
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static inline void debug_active_deactivate(struct i915_active *ref) { }
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static inline void debug_active_fini(struct i915_active *ref) { }
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static inline void debug_active_assert(struct i915_active *ref) { }
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#endif
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static void
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__active_retire(struct i915_active *ref)
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{
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struct active_node *it, *n;
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struct rb_root root;
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bool retire = false;
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lockdep_assert_held(&ref->mutex);
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/* return the unused nodes to our slabcache -- flushing the allocator */
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if (atomic_dec_and_test(&ref->count)) {
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debug_active_deactivate(ref);
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root = ref->tree;
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ref->tree = RB_ROOT;
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ref->cache = NULL;
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retire = true;
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}
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mutex_unlock(&ref->mutex);
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if (!retire)
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return;
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ref->retire(ref);
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rbtree_postorder_for_each_entry_safe(it, n, &root, node) {
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GEM_BUG_ON(i915_active_request_isset(&it->base));
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kmem_cache_free(global.slab_cache, it);
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}
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}
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static void
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active_retire(struct i915_active *ref)
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{
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GEM_BUG_ON(!atomic_read(&ref->count));
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if (atomic_add_unless(&ref->count, -1, 1))
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return;
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/* One active may be flushed from inside the acquire of another */
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mutex_lock_nested(&ref->mutex, SINGLE_DEPTH_NESTING);
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__active_retire(ref);
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}
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static void
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node_retire(struct i915_active_request *base, struct i915_request *rq)
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{
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active_retire(node_from_active(base)->ref);
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}
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static struct i915_active_request *
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active_instance(struct i915_active *ref, u64 idx)
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{
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struct active_node *node, *prealloc;
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struct rb_node **p, *parent;
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/*
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* We track the most recently used timeline to skip a rbtree search
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* for the common case, under typical loads we never need the rbtree
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* at all. We can reuse the last slot if it is empty, that is
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* after the previous activity has been retired, or if it matches the
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* current timeline.
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*/
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node = READ_ONCE(ref->cache);
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if (node && node->timeline == idx)
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return &node->base;
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/* Preallocate a replacement, just in case */
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prealloc = kmem_cache_alloc(global.slab_cache, GFP_KERNEL);
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if (!prealloc)
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return NULL;
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mutex_lock(&ref->mutex);
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GEM_BUG_ON(i915_active_is_idle(ref));
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parent = NULL;
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p = &ref->tree.rb_node;
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while (*p) {
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parent = *p;
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node = rb_entry(parent, struct active_node, node);
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if (node->timeline == idx) {
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kmem_cache_free(global.slab_cache, prealloc);
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goto out;
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}
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if (node->timeline < idx)
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p = &parent->rb_right;
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else
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p = &parent->rb_left;
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}
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node = prealloc;
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i915_active_request_init(&node->base, NULL, node_retire);
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node->ref = ref;
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node->timeline = idx;
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rb_link_node(&node->node, parent, p);
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rb_insert_color(&node->node, &ref->tree);
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out:
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ref->cache = node;
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mutex_unlock(&ref->mutex);
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BUILD_BUG_ON(offsetof(typeof(*node), base));
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return &node->base;
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}
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void __i915_active_init(struct drm_i915_private *i915,
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struct i915_active *ref,
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int (*active)(struct i915_active *ref),
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void (*retire)(struct i915_active *ref),
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struct lock_class_key *key)
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{
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debug_active_init(ref);
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ref->i915 = i915;
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ref->flags = 0;
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ref->active = active;
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ref->retire = retire;
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ref->tree = RB_ROOT;
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ref->cache = NULL;
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init_llist_head(&ref->preallocated_barriers);
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atomic_set(&ref->count, 0);
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__mutex_init(&ref->mutex, "i915_active", key);
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}
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static bool __active_del_barrier(struct i915_active *ref,
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struct active_node *node)
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{
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struct intel_engine_cs *engine = barrier_to_engine(node);
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struct llist_node *head = NULL, *tail = NULL;
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struct llist_node *pos, *next;
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GEM_BUG_ON(node->timeline != engine->kernel_context->ring->timeline->fence_context);
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/*
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* Rebuild the llist excluding our node. We may perform this
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* outside of the kernel_context timeline mutex and so someone
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* else may be manipulating the engine->barrier_tasks, in
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* which case either we or they will be upset :)
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*
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* A second __active_del_barrier() will report failure to claim
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* the active_node and the caller will just shrug and know not to
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* claim ownership of its node.
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*
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* A concurrent i915_request_add_active_barriers() will miss adding
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* any of the tasks, but we will try again on the next -- and since
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* we are actively using the barrier, we know that there will be
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* at least another opportunity when we idle.
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*/
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llist_for_each_safe(pos, next, llist_del_all(&engine->barrier_tasks)) {
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if (node == barrier_from_ll(pos)) {
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node = NULL;
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continue;
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}
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pos->next = head;
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head = pos;
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if (!tail)
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tail = pos;
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}
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if (head)
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llist_add_batch(head, tail, &engine->barrier_tasks);
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return !node;
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}
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int i915_active_ref(struct i915_active *ref,
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u64 timeline,
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struct i915_request *rq)
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{
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struct i915_active_request *active;
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int err;
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/* Prevent reaping in case we malloc/wait while building the tree */
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err = i915_active_acquire(ref);
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if (err)
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return err;
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active = active_instance(ref, timeline);
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if (!active) {
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err = -ENOMEM;
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goto out;
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}
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if (is_barrier(active)) { /* proto-node used by our idle barrier */
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/*
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* This request is on the kernel_context timeline, and so
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* we can use it to substitute for the pending idle-barrer
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* request that we want to emit on the kernel_context.
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*/
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__active_del_barrier(ref, node_from_active(active));
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RCU_INIT_POINTER(active->request, NULL);
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INIT_LIST_HEAD(&active->link);
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} else {
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if (!i915_active_request_isset(active))
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atomic_inc(&ref->count);
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}
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GEM_BUG_ON(!atomic_read(&ref->count));
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__i915_active_request_set(active, rq);
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out:
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i915_active_release(ref);
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return err;
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}
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int i915_active_acquire(struct i915_active *ref)
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{
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int err;
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debug_active_assert(ref);
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if (atomic_add_unless(&ref->count, 1, 0))
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return 0;
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err = mutex_lock_interruptible(&ref->mutex);
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if (err)
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return err;
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if (!atomic_read(&ref->count) && ref->active)
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err = ref->active(ref);
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if (!err) {
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debug_active_activate(ref);
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atomic_inc(&ref->count);
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}
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mutex_unlock(&ref->mutex);
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return err;
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}
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void i915_active_release(struct i915_active *ref)
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{
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debug_active_assert(ref);
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active_retire(ref);
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}
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static void __active_ungrab(struct i915_active *ref)
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{
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clear_and_wake_up_bit(I915_ACTIVE_GRAB_BIT, &ref->flags);
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}
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bool i915_active_trygrab(struct i915_active *ref)
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{
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debug_active_assert(ref);
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if (test_and_set_bit(I915_ACTIVE_GRAB_BIT, &ref->flags))
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return false;
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if (!atomic_add_unless(&ref->count, 1, 0)) {
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__active_ungrab(ref);
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return false;
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}
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return true;
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}
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void i915_active_ungrab(struct i915_active *ref)
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{
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GEM_BUG_ON(!test_bit(I915_ACTIVE_GRAB_BIT, &ref->flags));
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active_retire(ref);
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__active_ungrab(ref);
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}
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int i915_active_wait(struct i915_active *ref)
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{
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struct active_node *it, *n;
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int err;
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might_sleep();
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might_lock(&ref->mutex);
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if (i915_active_is_idle(ref))
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return 0;
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err = mutex_lock_interruptible(&ref->mutex);
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if (err)
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return err;
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if (!atomic_add_unless(&ref->count, 1, 0)) {
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mutex_unlock(&ref->mutex);
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return 0;
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}
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rbtree_postorder_for_each_entry_safe(it, n, &ref->tree, node) {
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if (is_barrier(&it->base)) { /* unconnected idle-barrier */
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err = -EBUSY;
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break;
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}
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err = i915_active_request_retire(&it->base, BKL(ref));
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if (err)
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break;
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}
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__active_retire(ref);
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if (err)
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return err;
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if (wait_on_bit(&ref->flags, I915_ACTIVE_GRAB_BIT, TASK_KILLABLE))
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return -EINTR;
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if (!i915_active_is_idle(ref))
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return -EBUSY;
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return 0;
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}
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int i915_request_await_active_request(struct i915_request *rq,
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struct i915_active_request *active)
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{
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struct i915_request *barrier =
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i915_active_request_raw(active, &rq->i915->drm.struct_mutex);
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return barrier ? i915_request_await_dma_fence(rq, &barrier->fence) : 0;
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}
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int i915_request_await_active(struct i915_request *rq, struct i915_active *ref)
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{
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struct active_node *it, *n;
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int err;
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if (RB_EMPTY_ROOT(&ref->tree))
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return 0;
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/* await allocates and so we need to avoid hitting the shrinker */
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err = i915_active_acquire(ref);
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if (err)
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return err;
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mutex_lock(&ref->mutex);
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rbtree_postorder_for_each_entry_safe(it, n, &ref->tree, node) {
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err = i915_request_await_active_request(rq, &it->base);
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if (err)
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break;
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}
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mutex_unlock(&ref->mutex);
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i915_active_release(ref);
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return err;
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}
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#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
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void i915_active_fini(struct i915_active *ref)
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{
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debug_active_fini(ref);
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GEM_BUG_ON(!RB_EMPTY_ROOT(&ref->tree));
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GEM_BUG_ON(atomic_read(&ref->count));
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mutex_destroy(&ref->mutex);
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}
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#endif
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static inline bool is_idle_barrier(struct active_node *node, u64 idx)
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{
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return node->timeline == idx && !i915_active_request_isset(&node->base);
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}
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static struct active_node *reuse_idle_barrier(struct i915_active *ref, u64 idx)
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{
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struct rb_node *prev, *p;
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if (RB_EMPTY_ROOT(&ref->tree))
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return NULL;
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mutex_lock(&ref->mutex);
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GEM_BUG_ON(i915_active_is_idle(ref));
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/*
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* Try to reuse any existing barrier nodes already allocated for this
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* i915_active, due to overlapping active phases there is likely a
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* node kept alive (as we reuse before parking). We prefer to reuse
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* completely idle barriers (less hassle in manipulating the llists),
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* but otherwise any will do.
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*/
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if (ref->cache && is_idle_barrier(ref->cache, idx)) {
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p = &ref->cache->node;
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goto match;
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}
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prev = NULL;
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p = ref->tree.rb_node;
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while (p) {
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struct active_node *node =
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rb_entry(p, struct active_node, node);
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if (is_idle_barrier(node, idx))
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goto match;
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prev = p;
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if (node->timeline < idx)
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p = p->rb_right;
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else
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p = p->rb_left;
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}
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/*
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* No quick match, but we did find the leftmost rb_node for the
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* kernel_context. Walk the rb_tree in-order to see if there were
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* any idle-barriers on this timeline that we missed, or just use
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* the first pending barrier.
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*/
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for (p = prev; p; p = rb_next(p)) {
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struct active_node *node =
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rb_entry(p, struct active_node, node);
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if (node->timeline > idx)
|
|
break;
|
|
|
|
if (node->timeline < idx)
|
|
continue;
|
|
|
|
if (is_idle_barrier(node, idx))
|
|
goto match;
|
|
|
|
/*
|
|
* The list of pending barriers is protected by the
|
|
* kernel_context timeline, which notably we do not hold
|
|
* here. i915_request_add_active_barriers() may consume
|
|
* the barrier before we claim it, so we have to check
|
|
* for success.
|
|
*/
|
|
if (is_barrier(&node->base) && __active_del_barrier(ref, node))
|
|
goto match;
|
|
}
|
|
|
|
mutex_unlock(&ref->mutex);
|
|
|
|
return NULL;
|
|
|
|
match:
|
|
rb_erase(p, &ref->tree); /* Hide from waits and sibling allocations */
|
|
if (p == &ref->cache->node)
|
|
ref->cache = NULL;
|
|
mutex_unlock(&ref->mutex);
|
|
|
|
return rb_entry(p, struct active_node, node);
|
|
}
|
|
|
|
int i915_active_acquire_preallocate_barrier(struct i915_active *ref,
|
|
struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *i915 = engine->i915;
|
|
intel_engine_mask_t tmp, mask = engine->mask;
|
|
struct llist_node *pos, *next;
|
|
int err;
|
|
|
|
GEM_BUG_ON(!llist_empty(&ref->preallocated_barriers));
|
|
|
|
/*
|
|
* Preallocate a node for each physical engine supporting the target
|
|
* engine (remember virtual engines have more than one sibling).
|
|
* We can then use the preallocated nodes in
|
|
* i915_active_acquire_barrier()
|
|
*/
|
|
for_each_engine_masked(engine, i915, mask, tmp) {
|
|
u64 idx = engine->kernel_context->ring->timeline->fence_context;
|
|
struct active_node *node;
|
|
|
|
node = reuse_idle_barrier(ref, idx);
|
|
if (!node) {
|
|
node = kmem_cache_alloc(global.slab_cache, GFP_KERNEL);
|
|
if (!node) {
|
|
err = ENOMEM;
|
|
goto unwind;
|
|
}
|
|
|
|
RCU_INIT_POINTER(node->base.request, NULL);
|
|
node->base.retire = node_retire;
|
|
node->timeline = idx;
|
|
node->ref = ref;
|
|
}
|
|
|
|
if (!i915_active_request_isset(&node->base)) {
|
|
/*
|
|
* Mark this as being *our* unconnected proto-node.
|
|
*
|
|
* Since this node is not in any list, and we have
|
|
* decoupled it from the rbtree, we can reuse the
|
|
* request to indicate this is an idle-barrier node
|
|
* and then we can use the rb_node and list pointers
|
|
* for our tracking of the pending barrier.
|
|
*/
|
|
RCU_INIT_POINTER(node->base.request, ERR_PTR(-EAGAIN));
|
|
node->base.link.prev = (void *)engine;
|
|
atomic_inc(&ref->count);
|
|
}
|
|
|
|
GEM_BUG_ON(barrier_to_engine(node) != engine);
|
|
llist_add(barrier_to_ll(node), &ref->preallocated_barriers);
|
|
intel_engine_pm_get(engine);
|
|
}
|
|
|
|
return 0;
|
|
|
|
unwind:
|
|
llist_for_each_safe(pos, next, take_preallocated_barriers(ref)) {
|
|
struct active_node *node = barrier_from_ll(pos);
|
|
|
|
atomic_dec(&ref->count);
|
|
intel_engine_pm_put(barrier_to_engine(node));
|
|
|
|
kmem_cache_free(global.slab_cache, node);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
void i915_active_acquire_barrier(struct i915_active *ref)
|
|
{
|
|
struct llist_node *pos, *next;
|
|
|
|
GEM_BUG_ON(i915_active_is_idle(ref));
|
|
|
|
/*
|
|
* Transfer the list of preallocated barriers into the
|
|
* i915_active rbtree, but only as proto-nodes. They will be
|
|
* populated by i915_request_add_active_barriers() to point to the
|
|
* request that will eventually release them.
|
|
*/
|
|
mutex_lock_nested(&ref->mutex, SINGLE_DEPTH_NESTING);
|
|
llist_for_each_safe(pos, next, take_preallocated_barriers(ref)) {
|
|
struct active_node *node = barrier_from_ll(pos);
|
|
struct intel_engine_cs *engine = barrier_to_engine(node);
|
|
struct rb_node **p, *parent;
|
|
|
|
parent = NULL;
|
|
p = &ref->tree.rb_node;
|
|
while (*p) {
|
|
struct active_node *it;
|
|
|
|
parent = *p;
|
|
|
|
it = rb_entry(parent, struct active_node, node);
|
|
if (it->timeline < node->timeline)
|
|
p = &parent->rb_right;
|
|
else
|
|
p = &parent->rb_left;
|
|
}
|
|
rb_link_node(&node->node, parent, p);
|
|
rb_insert_color(&node->node, &ref->tree);
|
|
|
|
llist_add(barrier_to_ll(node), &engine->barrier_tasks);
|
|
intel_engine_pm_put(engine);
|
|
}
|
|
mutex_unlock(&ref->mutex);
|
|
}
|
|
|
|
void i915_request_add_active_barriers(struct i915_request *rq)
|
|
{
|
|
struct intel_engine_cs *engine = rq->engine;
|
|
struct llist_node *node, *next;
|
|
|
|
GEM_BUG_ON(intel_engine_is_virtual(engine));
|
|
GEM_BUG_ON(rq->timeline != engine->kernel_context->ring->timeline);
|
|
|
|
/*
|
|
* Attach the list of proto-fences to the in-flight request such
|
|
* that the parent i915_active will be released when this request
|
|
* is retired.
|
|
*/
|
|
llist_for_each_safe(node, next, llist_del_all(&engine->barrier_tasks)) {
|
|
RCU_INIT_POINTER(barrier_from_ll(node)->base.request, rq);
|
|
list_add_tail((struct list_head *)node, &rq->active_list);
|
|
}
|
|
}
|
|
|
|
int i915_active_request_set(struct i915_active_request *active,
|
|
struct i915_request *rq)
|
|
{
|
|
int err;
|
|
|
|
/* Must maintain ordering wrt previous active requests */
|
|
err = i915_request_await_active_request(rq, active);
|
|
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)
|
|
{
|
|
/* Space left intentionally blank */
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
|
|
#include "selftests/i915_active.c"
|
|
#endif
|
|
|
|
static void i915_global_active_shrink(void)
|
|
{
|
|
kmem_cache_shrink(global.slab_cache);
|
|
}
|
|
|
|
static void i915_global_active_exit(void)
|
|
{
|
|
kmem_cache_destroy(global.slab_cache);
|
|
}
|
|
|
|
static struct i915_global_active global = { {
|
|
.shrink = i915_global_active_shrink,
|
|
.exit = i915_global_active_exit,
|
|
} };
|
|
|
|
int __init i915_global_active_init(void)
|
|
{
|
|
global.slab_cache = KMEM_CACHE(active_node, SLAB_HWCACHE_ALIGN);
|
|
if (!global.slab_cache)
|
|
return -ENOMEM;
|
|
|
|
i915_global_register(&global.base);
|
|
return 0;
|
|
}
|