Release 4.18 drivers/gpu/drm/i915/i915_timeline.h

/*
 * 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;

	/**
         * 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;
}

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void __i915_timeline_free(struct kref *kref);


static inline void i915_timeline_put(struct i915_timeline *timeline)
{
	kref_put(&timeline->kref, __i915_timeline_free);
}

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static inline int __i915_timeline_sync_set(struct i915_timeline *tl,
					   u64 context, u32 seqno)
{
	return i915_syncmap_set(&tl->sync, context, seqno);
}

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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);
}

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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);
}

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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);
}

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void i915_timelines_park(struct drm_i915_private *i915);

#endif
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Directory: drivers/gpu/drm/i915

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