524 lines
12 KiB
C
524 lines
12 KiB
C
/*
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* (C) Copyright 2016 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#include <linux/slab.h>
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#include <linux/dma-fence.h>
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#include <linux/irq_work.h>
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#include <linux/reservation.h>
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#include "i915_sw_fence.h"
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#include "i915_selftest.h"
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#define I915_SW_FENCE_FLAG_ALLOC BIT(3) /* after WQ_FLAG_* for safety */
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static DEFINE_SPINLOCK(i915_sw_fence_lock);
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enum {
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DEBUG_FENCE_IDLE = 0,
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DEBUG_FENCE_NOTIFY,
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};
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#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
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static void *i915_sw_fence_debug_hint(void *addr)
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{
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return (void *)(((struct i915_sw_fence *)addr)->flags & I915_SW_FENCE_MASK);
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}
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static struct debug_obj_descr i915_sw_fence_debug_descr = {
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.name = "i915_sw_fence",
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.debug_hint = i915_sw_fence_debug_hint,
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};
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static inline void debug_fence_init(struct i915_sw_fence *fence)
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{
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debug_object_init(fence, &i915_sw_fence_debug_descr);
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}
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static inline void debug_fence_init_onstack(struct i915_sw_fence *fence)
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{
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debug_object_init_on_stack(fence, &i915_sw_fence_debug_descr);
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}
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static inline void debug_fence_activate(struct i915_sw_fence *fence)
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{
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debug_object_activate(fence, &i915_sw_fence_debug_descr);
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}
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static inline void debug_fence_set_state(struct i915_sw_fence *fence,
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int old, int new)
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{
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debug_object_active_state(fence, &i915_sw_fence_debug_descr, old, new);
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}
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static inline void debug_fence_deactivate(struct i915_sw_fence *fence)
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{
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debug_object_deactivate(fence, &i915_sw_fence_debug_descr);
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}
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static inline void debug_fence_destroy(struct i915_sw_fence *fence)
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{
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debug_object_destroy(fence, &i915_sw_fence_debug_descr);
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}
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static inline void debug_fence_free(struct i915_sw_fence *fence)
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{
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debug_object_free(fence, &i915_sw_fence_debug_descr);
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smp_wmb(); /* flush the change in state before reallocation */
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}
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static inline void debug_fence_assert(struct i915_sw_fence *fence)
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{
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debug_object_assert_init(fence, &i915_sw_fence_debug_descr);
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}
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#else
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static inline void debug_fence_init(struct i915_sw_fence *fence)
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{
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}
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static inline void debug_fence_init_onstack(struct i915_sw_fence *fence)
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{
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}
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static inline void debug_fence_activate(struct i915_sw_fence *fence)
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{
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}
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static inline void debug_fence_set_state(struct i915_sw_fence *fence,
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int old, int new)
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{
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}
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static inline void debug_fence_deactivate(struct i915_sw_fence *fence)
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{
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}
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static inline void debug_fence_destroy(struct i915_sw_fence *fence)
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{
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}
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static inline void debug_fence_free(struct i915_sw_fence *fence)
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{
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}
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static inline void debug_fence_assert(struct i915_sw_fence *fence)
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{
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}
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#endif
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static int __i915_sw_fence_notify(struct i915_sw_fence *fence,
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enum i915_sw_fence_notify state)
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{
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i915_sw_fence_notify_t fn;
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fn = (i915_sw_fence_notify_t)(fence->flags & I915_SW_FENCE_MASK);
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return fn(fence, state);
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}
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#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
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void i915_sw_fence_fini(struct i915_sw_fence *fence)
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{
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debug_fence_free(fence);
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}
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#endif
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static void __i915_sw_fence_wake_up_all(struct i915_sw_fence *fence,
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struct list_head *continuation)
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{
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wait_queue_head_t *x = &fence->wait;
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wait_queue_entry_t *pos, *next;
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unsigned long flags;
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debug_fence_deactivate(fence);
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atomic_set_release(&fence->pending, -1); /* 0 -> -1 [done] */
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/*
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* To prevent unbounded recursion as we traverse the graph of
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* i915_sw_fences, we move the entry list from this, the next ready
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* fence, to the tail of the original fence's entry list
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* (and so added to the list to be woken).
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*/
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spin_lock_irqsave_nested(&x->lock, flags, 1 + !!continuation);
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if (continuation) {
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list_for_each_entry_safe(pos, next, &x->head, entry) {
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if (pos->func == autoremove_wake_function)
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pos->func(pos, TASK_NORMAL, 0, continuation);
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else
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list_move_tail(&pos->entry, continuation);
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}
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} else {
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LIST_HEAD(extra);
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do {
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list_for_each_entry_safe(pos, next, &x->head, entry)
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pos->func(pos, TASK_NORMAL, 0, &extra);
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if (list_empty(&extra))
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break;
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list_splice_tail_init(&extra, &x->head);
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} while (1);
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}
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spin_unlock_irqrestore(&x->lock, flags);
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debug_fence_assert(fence);
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}
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static void __i915_sw_fence_complete(struct i915_sw_fence *fence,
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struct list_head *continuation)
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{
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debug_fence_assert(fence);
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if (!atomic_dec_and_test(&fence->pending))
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return;
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debug_fence_set_state(fence, DEBUG_FENCE_IDLE, DEBUG_FENCE_NOTIFY);
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if (__i915_sw_fence_notify(fence, FENCE_COMPLETE) != NOTIFY_DONE)
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return;
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debug_fence_set_state(fence, DEBUG_FENCE_NOTIFY, DEBUG_FENCE_IDLE);
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__i915_sw_fence_wake_up_all(fence, continuation);
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debug_fence_destroy(fence);
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__i915_sw_fence_notify(fence, FENCE_FREE);
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}
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static void i915_sw_fence_complete(struct i915_sw_fence *fence)
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{
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debug_fence_assert(fence);
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if (WARN_ON(i915_sw_fence_done(fence)))
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return;
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__i915_sw_fence_complete(fence, NULL);
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}
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static void i915_sw_fence_await(struct i915_sw_fence *fence)
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{
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debug_fence_assert(fence);
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WARN_ON(atomic_inc_return(&fence->pending) <= 1);
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}
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void __i915_sw_fence_init(struct i915_sw_fence *fence,
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i915_sw_fence_notify_t fn,
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const char *name,
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struct lock_class_key *key)
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{
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BUG_ON(!fn || (unsigned long)fn & ~I915_SW_FENCE_MASK);
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debug_fence_init(fence);
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__init_waitqueue_head(&fence->wait, name, key);
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atomic_set(&fence->pending, 1);
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fence->flags = (unsigned long)fn;
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}
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void i915_sw_fence_commit(struct i915_sw_fence *fence)
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{
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debug_fence_activate(fence);
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i915_sw_fence_complete(fence);
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}
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static int i915_sw_fence_wake(wait_queue_entry_t *wq, unsigned mode, int flags, void *key)
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{
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list_del(&wq->entry);
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__i915_sw_fence_complete(wq->private, key);
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if (wq->flags & I915_SW_FENCE_FLAG_ALLOC)
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kfree(wq);
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return 0;
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}
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static bool __i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
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const struct i915_sw_fence * const signaler)
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{
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wait_queue_entry_t *wq;
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if (__test_and_set_bit(I915_SW_FENCE_CHECKED_BIT, &fence->flags))
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return false;
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if (fence == signaler)
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return true;
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list_for_each_entry(wq, &fence->wait.head, entry) {
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if (wq->func != i915_sw_fence_wake)
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continue;
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if (__i915_sw_fence_check_if_after(wq->private, signaler))
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return true;
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}
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return false;
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}
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static void __i915_sw_fence_clear_checked_bit(struct i915_sw_fence *fence)
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{
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wait_queue_entry_t *wq;
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if (!__test_and_clear_bit(I915_SW_FENCE_CHECKED_BIT, &fence->flags))
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return;
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list_for_each_entry(wq, &fence->wait.head, entry) {
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if (wq->func != i915_sw_fence_wake)
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continue;
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__i915_sw_fence_clear_checked_bit(wq->private);
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}
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}
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static bool i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
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const struct i915_sw_fence * const signaler)
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{
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unsigned long flags;
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bool err;
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if (!IS_ENABLED(CONFIG_DRM_I915_SW_FENCE_CHECK_DAG))
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return false;
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spin_lock_irqsave(&i915_sw_fence_lock, flags);
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err = __i915_sw_fence_check_if_after(fence, signaler);
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__i915_sw_fence_clear_checked_bit(fence);
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spin_unlock_irqrestore(&i915_sw_fence_lock, flags);
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return err;
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}
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static int __i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
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struct i915_sw_fence *signaler,
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wait_queue_entry_t *wq, gfp_t gfp)
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{
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unsigned long flags;
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int pending;
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debug_fence_assert(fence);
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might_sleep_if(gfpflags_allow_blocking(gfp));
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if (i915_sw_fence_done(signaler))
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return 0;
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debug_fence_assert(signaler);
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/* The dependency graph must be acyclic. */
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if (unlikely(i915_sw_fence_check_if_after(fence, signaler)))
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return -EINVAL;
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pending = 0;
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if (!wq) {
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wq = kmalloc(sizeof(*wq), gfp);
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if (!wq) {
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if (!gfpflags_allow_blocking(gfp))
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return -ENOMEM;
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i915_sw_fence_wait(signaler);
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return 0;
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}
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pending |= I915_SW_FENCE_FLAG_ALLOC;
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}
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INIT_LIST_HEAD(&wq->entry);
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wq->flags = pending;
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wq->func = i915_sw_fence_wake;
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wq->private = fence;
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i915_sw_fence_await(fence);
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spin_lock_irqsave(&signaler->wait.lock, flags);
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if (likely(!i915_sw_fence_done(signaler))) {
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__add_wait_queue_entry_tail(&signaler->wait, wq);
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pending = 1;
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} else {
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i915_sw_fence_wake(wq, 0, 0, NULL);
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pending = 0;
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}
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spin_unlock_irqrestore(&signaler->wait.lock, flags);
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return pending;
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}
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int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
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struct i915_sw_fence *signaler,
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wait_queue_entry_t *wq)
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{
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return __i915_sw_fence_await_sw_fence(fence, signaler, wq, 0);
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}
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int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence,
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struct i915_sw_fence *signaler,
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gfp_t gfp)
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{
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return __i915_sw_fence_await_sw_fence(fence, signaler, NULL, gfp);
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}
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struct i915_sw_dma_fence_cb {
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struct dma_fence_cb base;
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struct i915_sw_fence *fence;
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struct dma_fence *dma;
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struct timer_list timer;
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struct irq_work work;
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struct rcu_head rcu;
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};
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static void timer_i915_sw_fence_wake(struct timer_list *t)
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{
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struct i915_sw_dma_fence_cb *cb = from_timer(cb, t, timer);
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struct i915_sw_fence *fence;
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fence = xchg(&cb->fence, NULL);
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if (!fence)
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return;
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pr_warn("asynchronous wait on fence %s:%s:%x timed out\n",
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cb->dma->ops->get_driver_name(cb->dma),
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cb->dma->ops->get_timeline_name(cb->dma),
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cb->dma->seqno);
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i915_sw_fence_complete(fence);
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}
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static void dma_i915_sw_fence_wake(struct dma_fence *dma,
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struct dma_fence_cb *data)
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{
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struct i915_sw_dma_fence_cb *cb = container_of(data, typeof(*cb), base);
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struct i915_sw_fence *fence;
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fence = xchg(&cb->fence, NULL);
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if (fence)
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i915_sw_fence_complete(fence);
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irq_work_queue(&cb->work);
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}
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static void irq_i915_sw_fence_work(struct irq_work *wrk)
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{
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struct i915_sw_dma_fence_cb *cb = container_of(wrk, typeof(*cb), work);
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del_timer_sync(&cb->timer);
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dma_fence_put(cb->dma);
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kfree_rcu(cb, rcu);
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}
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int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
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struct dma_fence *dma,
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unsigned long timeout,
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gfp_t gfp)
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{
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struct i915_sw_dma_fence_cb *cb;
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int ret;
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debug_fence_assert(fence);
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might_sleep_if(gfpflags_allow_blocking(gfp));
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if (dma_fence_is_signaled(dma))
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return 0;
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cb = kmalloc(sizeof(*cb), gfp);
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if (!cb) {
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if (!gfpflags_allow_blocking(gfp))
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return -ENOMEM;
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return dma_fence_wait(dma, false);
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}
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cb->fence = fence;
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i915_sw_fence_await(fence);
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cb->dma = NULL;
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timer_setup(&cb->timer, timer_i915_sw_fence_wake, TIMER_IRQSAFE);
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init_irq_work(&cb->work, irq_i915_sw_fence_work);
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if (timeout) {
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cb->dma = dma_fence_get(dma);
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mod_timer(&cb->timer, round_jiffies_up(jiffies + timeout));
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}
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ret = dma_fence_add_callback(dma, &cb->base, dma_i915_sw_fence_wake);
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if (ret == 0) {
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ret = 1;
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} else {
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dma_i915_sw_fence_wake(dma, &cb->base);
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if (ret == -ENOENT) /* fence already signaled */
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ret = 0;
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}
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return ret;
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}
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int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
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struct reservation_object *resv,
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const struct dma_fence_ops *exclude,
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bool write,
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unsigned long timeout,
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gfp_t gfp)
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{
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struct dma_fence *excl;
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int ret = 0, pending;
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debug_fence_assert(fence);
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might_sleep_if(gfpflags_allow_blocking(gfp));
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if (write) {
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struct dma_fence **shared;
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unsigned int count, i;
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ret = reservation_object_get_fences_rcu(resv,
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&excl, &count, &shared);
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if (ret)
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return ret;
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for (i = 0; i < count; i++) {
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if (shared[i]->ops == exclude)
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continue;
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pending = i915_sw_fence_await_dma_fence(fence,
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shared[i],
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timeout,
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gfp);
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if (pending < 0) {
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ret = pending;
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break;
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}
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ret |= pending;
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}
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for (i = 0; i < count; i++)
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dma_fence_put(shared[i]);
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kfree(shared);
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} else {
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excl = reservation_object_get_excl_rcu(resv);
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}
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if (ret >= 0 && excl && excl->ops != exclude) {
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pending = i915_sw_fence_await_dma_fence(fence,
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excl,
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timeout,
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gfp);
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if (pending < 0)
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ret = pending;
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else
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ret |= pending;
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}
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dma_fence_put(excl);
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return ret;
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}
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#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
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#include "selftests/lib_sw_fence.c"
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#include "selftests/i915_sw_fence.c"
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#endif
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