/*
|
* 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);
|
|
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
|
