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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2019 Intel Corporation
*/
#ifndef __INTEL_CONTEXT_H__
#define __INTEL_CONTEXT_H__
#include <linux/lockdep.h>
#include "intel_context_types.h"
#include "intel_engine_types.h"
struct intel_context *intel_context_alloc(void);
void intel_context_free(struct intel_context *ce);
void intel_context_init(struct intel_context *ce,
struct i915_gem_context *ctx,
struct intel_engine_cs *engine);
/**
* intel_context_lookup - Find the matching HW context for this (ctx, engine)
* @ctx - the parent GEM context
* @engine - the target HW engine
*
* May return NULL if the HW context hasn't been instantiated (i.e. unused).
*/
struct intel_context *
intel_context_lookup(struct i915_gem_context *ctx,
struct intel_engine_cs *engine);
/**
* intel_context_pin_lock - Stablises the 'pinned' status of the HW context
* @ctx - the parent GEM context
* @engine - the target HW engine
*
* Acquire a lock on the pinned status of the HW context, such that the context
* can neither be bound to the GPU or unbound whilst the lock is held, i.e.
* intel_context_is_pinned() remains stable.
*/
struct intel_context *
intel_context_pin_lock(struct i915_gem_context *ctx,
struct intel_engine_cs *engine);
static inline bool
intel_context_is_pinned(struct intel_context *ce)
{
return atomic_read(&ce->pin_count);
}
static inline void intel_context_pin_unlock(struct intel_context *ce)
__releases(ce->pin_mutex)
{
mutex_unlock(&ce->pin_mutex);
}
struct intel_context *
__intel_context_insert(struct i915_gem_context *ctx,
struct intel_engine_cs *engine,
struct intel_context *ce);
void
__intel_context_remove(struct intel_context *ce);
struct intel_context *
intel_context_pin(struct i915_gem_context *ctx, struct intel_engine_cs *engine);
static inline void __intel_context_pin(struct intel_context *ce)
{
GEM_BUG_ON(!intel_context_is_pinned(ce));
atomic_inc(&ce->pin_count);
}
void intel_context_unpin(struct intel_context *ce);
void intel_context_enter_engine(struct intel_context *ce);
void intel_context_exit_engine(struct intel_context *ce);
static inline void intel_context_enter(struct intel_context *ce)
{
if (!ce->active_count++)
ce->ops->enter(ce);
}
static inline void intel_context_mark_active(struct intel_context *ce)
{
++ce->active_count;
}
static inline void intel_context_exit(struct intel_context *ce)
{
GEM_BUG_ON(!ce->active_count);
if (!--ce->active_count)
ce->ops->exit(ce);
}
static inline struct intel_context *intel_context_get(struct intel_context *ce)
{
kref_get(&ce->ref);
return ce;
}
static inline void intel_context_put(struct intel_context *ce)
{
kref_put(&ce->ref, ce->ops->destroy);
}
#endif /* __INTEL_CONTEXT_H__ */
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