forked from Minki/linux
0e932c080c
Currently, we have an active reference for the request until it is retired. Though it cannot be retired before it has been executed by hardware, the request may be completed before we have finished processing the execute fence, i.e. we may continue to process that fence as we free the request. Fixes:5590af3e11("drm/i915: Drive request submission through fence callbacks") Fixes:23902e49c9("drm/i915: Split request submit/execute phase into two") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161125131718.20978-3-chris@chris-wilson.co.uk (cherry picked from commit48bc2a4a42) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*
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* i915_sw_fence.h - library routines for N:M synchronisation points
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*
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* Copyright (C) 2016 Intel Corporation
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*
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* This file is released under the GPLv2.
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*
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*/
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#ifndef _I915_SW_FENCE_H_
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#define _I915_SW_FENCE_H_
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#include <linux/gfp.h>
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#include <linux/kref.h>
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#include <linux/notifier.h> /* for NOTIFY_DONE */
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#include <linux/wait.h>
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struct completion;
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struct dma_fence;
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struct dma_fence_ops;
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struct reservation_object;
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struct i915_sw_fence {
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wait_queue_head_t wait;
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unsigned long flags;
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struct kref kref;
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atomic_t pending;
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};
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#define I915_SW_FENCE_CHECKED_BIT 0 /* used internally for DAG checking */
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#define I915_SW_FENCE_PRIVATE_BIT 1 /* available for use by owner */
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#define I915_SW_FENCE_MASK (~3)
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enum i915_sw_fence_notify {
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FENCE_COMPLETE,
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FENCE_FREE
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};
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typedef int (*i915_sw_fence_notify_t)(struct i915_sw_fence *,
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enum i915_sw_fence_notify state);
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#define __i915_sw_fence_call __aligned(4)
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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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#ifdef CONFIG_LOCKDEP
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#define i915_sw_fence_init(fence, fn) \
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do { \
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static struct lock_class_key __key; \
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\
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__i915_sw_fence_init((fence), (fn), #fence, &__key); \
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} while (0)
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#else
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#define i915_sw_fence_init(fence, fn) \
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__i915_sw_fence_init((fence), (fn), NULL, NULL)
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#endif
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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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#else
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static inline void i915_sw_fence_fini(struct i915_sw_fence *fence) {}
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#endif
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void i915_sw_fence_commit(struct i915_sw_fence *fence);
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int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
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struct i915_sw_fence *after,
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wait_queue_t *wq);
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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 *after,
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gfp_t gfp);
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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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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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static inline bool i915_sw_fence_signaled(const struct i915_sw_fence *fence)
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{
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return atomic_read(&fence->pending) <= 0;
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}
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static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence)
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{
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return atomic_read(&fence->pending) < 0;
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}
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static inline void i915_sw_fence_wait(struct i915_sw_fence *fence)
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{
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wait_event(fence->wait, i915_sw_fence_done(fence));
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}
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#endif /* _I915_SW_FENCE_H_ */
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