604 lines
14 KiB
C
604 lines
14 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* (C) Copyright 2016 Intel Corporation
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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/dma-resv.h>
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#include "i915_sw_fence.h"
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#include "i915_selftest.h"
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#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
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#define I915_SW_FENCE_BUG_ON(expr) BUG_ON(expr)
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#else
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#define I915_SW_FENCE_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
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#endif
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#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
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static DEFINE_SPINLOCK(i915_sw_fence_lock);
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#endif
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#define WQ_FLAG_BITS \
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BITS_PER_TYPE(typeof_member(struct wait_queue_entry, flags))
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/* after WQ_FLAG_* for safety */
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#define I915_SW_FENCE_FLAG_FENCE BIT(WQ_FLAG_BITS - 1)
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#define I915_SW_FENCE_FLAG_ALLOC BIT(WQ_FLAG_BITS - 2)
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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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static void *i915_sw_fence_debug_hint(void *addr)
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{
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return (void *)(((struct i915_sw_fence *)addr)->fn);
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}
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#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
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static const 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 __maybe_unused 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 __maybe_unused 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 __maybe_unused 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 __maybe_unused 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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return fence->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->flags & I915_SW_FENCE_FLAG_FENCE)
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list_move_tail(&pos->entry, continuation);
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else
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pos->func(pos, TASK_NORMAL, 0, 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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int wake_flags;
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wake_flags = 0;
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if (pos->flags & I915_SW_FENCE_FLAG_FENCE)
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wake_flags = fence->error;
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pos->func(pos, TASK_NORMAL, wake_flags, &extra);
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}
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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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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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bool i915_sw_fence_await(struct i915_sw_fence *fence)
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{
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int pending;
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/*
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* It is only safe to add a new await to the fence while it has
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* not yet been signaled (i.e. there are still existing signalers).
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*/
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pending = atomic_read(&fence->pending);
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do {
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if (pending < 1)
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return false;
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} while (!atomic_try_cmpxchg(&fence->pending, &pending, pending + 1));
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return true;
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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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__init_waitqueue_head(&fence->wait, name, key);
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fence->fn = fn;
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#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
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fence->flags = 0;
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#endif
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i915_sw_fence_reinit(fence);
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}
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void i915_sw_fence_reinit(struct i915_sw_fence *fence)
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{
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debug_fence_init(fence);
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atomic_set(&fence->pending, 1);
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fence->error = 0;
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I915_SW_FENCE_BUG_ON(!list_empty(&fence->wait.head));
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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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i915_sw_fence_set_error_once(wq->private, flags);
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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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#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
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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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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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#else
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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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return false;
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}
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#endif
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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 int pending;
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unsigned long flags;
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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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i915_sw_fence_set_error_once(fence, signaler->error);
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return 0;
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}
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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 = I915_SW_FENCE_FLAG_FENCE;
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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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i915_sw_fence_set_error_once(fence, signaler->error);
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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, signaler->error, 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_timer {
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struct i915_sw_dma_fence_cb base;
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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 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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i915_sw_fence_set_error_once(cb->fence, dma->error);
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i915_sw_fence_complete(cb->fence);
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kfree(cb);
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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_timer *cb = from_timer(cb, t, timer);
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struct i915_sw_fence *fence;
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fence = xchg(&cb->base.fence, NULL);
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if (!fence)
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return;
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pr_notice("Asynchronous wait on fence %s:%s:%llx timed out (hint:%ps)\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_debug_hint(fence));
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i915_sw_fence_set_error_once(fence, -ETIMEDOUT);
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i915_sw_fence_complete(fence);
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}
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static void dma_i915_sw_fence_wake_timer(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_timer *cb =
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container_of(data, typeof(*cb), base.base);
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struct i915_sw_fence *fence;
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fence = xchg(&cb->base.fence, NULL);
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if (fence) {
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i915_sw_fence_set_error_once(fence, dma->error);
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i915_sw_fence_complete(fence);
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}
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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_timer *cb =
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container_of(wrk, typeof(*cb), work);
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timer_shutdown_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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dma_fence_func_t func;
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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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i915_sw_fence_set_error_once(fence, dma->error);
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return 0;
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}
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cb = kmalloc(timeout ?
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sizeof(struct i915_sw_dma_fence_cb_timer) :
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sizeof(struct i915_sw_dma_fence_cb),
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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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ret = dma_fence_wait(dma, false);
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if (ret)
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return ret;
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i915_sw_fence_set_error_once(fence, dma->error);
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return 0;
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}
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|
cb->fence = fence;
|
|
i915_sw_fence_await(fence);
|
|
|
|
func = dma_i915_sw_fence_wake;
|
|
if (timeout) {
|
|
struct i915_sw_dma_fence_cb_timer *timer =
|
|
container_of(cb, typeof(*timer), base);
|
|
|
|
timer->dma = dma_fence_get(dma);
|
|
init_irq_work(&timer->work, irq_i915_sw_fence_work);
|
|
|
|
timer_setup(&timer->timer,
|
|
timer_i915_sw_fence_wake, TIMER_IRQSAFE);
|
|
mod_timer(&timer->timer, round_jiffies_up(jiffies + timeout));
|
|
|
|
func = dma_i915_sw_fence_wake_timer;
|
|
}
|
|
|
|
ret = dma_fence_add_callback(dma, &cb->base, func);
|
|
if (ret == 0) {
|
|
ret = 1;
|
|
} else {
|
|
func(dma, &cb->base);
|
|
if (ret == -ENOENT) /* fence already signaled */
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __dma_i915_sw_fence_wake(struct dma_fence *dma,
|
|
struct dma_fence_cb *data)
|
|
{
|
|
struct i915_sw_dma_fence_cb *cb = container_of(data, typeof(*cb), base);
|
|
|
|
i915_sw_fence_set_error_once(cb->fence, dma->error);
|
|
i915_sw_fence_complete(cb->fence);
|
|
}
|
|
|
|
int __i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
|
|
struct dma_fence *dma,
|
|
struct i915_sw_dma_fence_cb *cb)
|
|
{
|
|
int ret;
|
|
|
|
debug_fence_assert(fence);
|
|
|
|
if (dma_fence_is_signaled(dma)) {
|
|
i915_sw_fence_set_error_once(fence, dma->error);
|
|
return 0;
|
|
}
|
|
|
|
cb->fence = fence;
|
|
i915_sw_fence_await(fence);
|
|
|
|
ret = 1;
|
|
if (dma_fence_add_callback(dma, &cb->base, __dma_i915_sw_fence_wake)) {
|
|
/* fence already signaled */
|
|
__dma_i915_sw_fence_wake(dma, &cb->base);
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
|
|
struct dma_resv *resv,
|
|
bool write,
|
|
unsigned long timeout,
|
|
gfp_t gfp)
|
|
{
|
|
struct dma_resv_iter cursor;
|
|
struct dma_fence *f;
|
|
int ret = 0, pending;
|
|
|
|
debug_fence_assert(fence);
|
|
might_sleep_if(gfpflags_allow_blocking(gfp));
|
|
|
|
dma_resv_iter_begin(&cursor, resv, dma_resv_usage_rw(write));
|
|
dma_resv_for_each_fence_unlocked(&cursor, f) {
|
|
pending = i915_sw_fence_await_dma_fence(fence, f, timeout,
|
|
gfp);
|
|
if (pending < 0) {
|
|
ret = pending;
|
|
break;
|
|
}
|
|
|
|
ret |= pending;
|
|
}
|
|
dma_resv_iter_end(&cursor);
|
|
return ret;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
|
|
#include "selftests/lib_sw_fence.c"
|
|
#include "selftests/i915_sw_fence.c"
|
|
#endif
|