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/*
* Copyright © 2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#ifndef I915_TIMELINE_H
#define I915_TIMELINE_H
#include <linux/list.h>
#include <linux/kref.h>
#include "i915_request.h"
#include "i915_syncmap.h"
#include "i915_utils.h"
struct i915_timeline {
u64 fence_context;
u32 seqno;
spinlock_t lock;
#define TIMELINE_CLIENT 0 /* default subclass */
#define TIMELINE_ENGINE 1
/**
* List of breadcrumbs associated with GPU requests currently
* outstanding.
*/
struct list_head requests;
/* Contains an RCU guarded pointer to the last request. No reference is
* held to the request, users must carefully acquire a reference to
* the request using i915_gem_active_get_request_rcu(), or hold the
* struct_mutex.
*/
struct i915_gem_active last_request;
/**
* We track the most recent seqno that we wait on in every context so
* that we only have to emit a new await and dependency on a more
* recent sync point. As the contexts may be executed out-of-order, we
* have to track each individually and can not rely on an absolute
* global_seqno. When we know that all tracked fences are completed
* (i.e. when the driver is idle), we know that the syncmap is
* redundant and we can discard it without loss of generality.
*/
struct i915_syncmap *sync;
/**
* Separately to the inter-context seqno map above, we track the last
* barrier (e.g. semaphore wait) to the global engine timelines. Note
* that this tracks global_seqno rather than the context.seqno, and
* so it is subject to the limitations of hw wraparound and that we
* may need to revoke global_seqno (on pre-emption).
*/
u32 global_sync[I915_NUM_ENGINES];
struct list_head link;
const char *name;
struct kref kref;
};
void i915_timeline_init(struct drm_i915_private *i915,
struct i915_timeline *tl,
const char *name);
void i915_timeline_fini(struct i915_timeline *tl);
static inline void
i915_timeline_set_subclass(struct i915_timeline *timeline,
unsigned int subclass)
{
lockdep_set_subclass(&timeline->lock, subclass);
/*
* Due to an interesting quirk in lockdep's internal debug tracking,
* after setting a subclass we must ensure the lock is used. Otherwise,
* nr_unused_locks is incremented once too often.
*/
#ifdef CONFIG_DEBUG_LOCK_ALLOC
local_irq_disable();
lock_map_acquire(&timeline->lock.dep_map);
lock_map_release(&timeline->lock.dep_map);
local_irq_enable();
#endif
}
struct i915_timeline *
i915_timeline_create(struct drm_i915_private *i915, const char *name);
static inline struct i915_timeline *
i915_timeline_get(struct i915_timeline *timeline)
{
kref_get(&timeline->kref);
return timeline;
}
void __i915_timeline_free(struct kref *kref);
static inline void i915_timeline_put(struct i915_timeline *timeline)
{
kref_put(&timeline->kref, __i915_timeline_free);
}
static inline int __i915_timeline_sync_set(struct i915_timeline *tl,
u64 context, u32 seqno)
{
return i915_syncmap_set(&tl->sync, context, seqno);
}
static inline int i915_timeline_sync_set(struct i915_timeline *tl,
const struct dma_fence *fence)
{
return __i915_timeline_sync_set(tl, fence->context, fence->seqno);
}
static inline bool __i915_timeline_sync_is_later(struct i915_timeline *tl,
u64 context, u32 seqno)
{
return i915_syncmap_is_later(&tl->sync, context, seqno);
}
static inline bool i915_timeline_sync_is_later(struct i915_timeline *tl,
const struct dma_fence *fence)
{
return __i915_timeline_sync_is_later(tl, fence->context, fence->seqno);
}
void i915_timelines_park(struct drm_i915_private *i915);
#endif
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