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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 "i915_active.h"
#include "intel_context_types.h"
#include "intel_engine_types.h"
#include "intel_timeline_types.h"
void intel_context_init(struct intel_context *ce,
struct i915_gem_context *ctx,
struct intel_engine_cs *engine);
void intel_context_fini(struct intel_context *ce);
struct intel_context *
intel_context_create(struct i915_gem_context *ctx,
struct intel_engine_cs *engine);
void intel_context_free(struct intel_context *ce);
/**
* intel_context_lock_pinned - Stablises the 'pinned' status of the HW context
* @ce - the context
*
* 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.
*/
static inline int intel_context_lock_pinned(struct intel_context *ce)
__acquires(ce->pin_mutex)
{
return mutex_lock_interruptible(&ce->pin_mutex);
}
/**
* intel_context_is_pinned - Reports the 'pinned' status
* @ce - the context
*
* While in use by the GPU, the context, along with its ring and page
* tables is pinned into memory and the GTT.
*
* Returns: true if the context is currently pinned for use by the GPU.
*/
static inline bool
intel_context_is_pinned(struct intel_context *ce)
{
return atomic_read(&ce->pin_count);
}
/**
* intel_context_unlock_pinned - Releases the earlier locking of 'pinned' status
* @ce - the context
*
* Releases the lock earlier acquired by intel_context_unlock_pinned().
*/
static inline void intel_context_unlock_pinned(struct intel_context *ce)
__releases(ce->pin_mutex)
{
mutex_unlock(&ce->pin_mutex);
}
int __intel_context_do_pin(struct intel_context *ce);
static inline int intel_context_pin(struct intel_context *ce)
{
if (likely(atomic_inc_not_zero(&ce->pin_count)))
return 0;
return __intel_context_do_pin(ce);
}
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)
{
lockdep_assert_held(&ce->timeline->mutex);
if (!ce->active_count++)
ce->ops->enter(ce);
}
static inline void intel_context_mark_active(struct intel_context *ce)
{
lockdep_assert_held(&ce->timeline->mutex);
++ce->active_count;
}
static inline void intel_context_exit(struct intel_context *ce)
{
lockdep_assert_held(&ce->timeline->mutex);
GEM_BUG_ON(!ce->active_count);
if (!--ce->active_count)
ce->ops->exit(ce);
}
int intel_context_active_acquire(struct intel_context *ce);
void intel_context_active_release(struct intel_context *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);
}
static inline struct intel_timeline *__must_check
intel_context_timeline_lock(struct intel_context *ce)
__acquires(&ce->timeline->mutex)
{
struct intel_timeline *tl = ce->timeline;
int err;
err = mutex_lock_interruptible(&tl->mutex);
if (err)
return ERR_PTR(err);
return tl;
}
static inline void intel_context_timeline_unlock(struct intel_timeline *tl)
__releases(&tl->mutex)
{
mutex_unlock(&tl->mutex);
}
int intel_context_prepare_remote_request(struct intel_context *ce,
struct i915_request *rq);
struct i915_request *intel_context_create_request(struct intel_context *ce);
static inline struct intel_ring *__intel_context_ring_size(u64 sz)
{
return u64_to_ptr(struct intel_ring, sz);
}
#endif /* __INTEL_CONTEXT_H__ */
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