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6c69a45445
We use timeline->mutex to protect modifications to context->active_count, and the associated enable/disable callbacks. Due to complications with engine-pm barrier there is a path where we used a "superlock" to provide serialised protect and so could not unconditionally assert with lockdep that it was always held. However, we can mark the mutex as taken (noting that we may be nested underneath ourselves) which means we can be reassured the right timeline->mutex is always treated as held and let lockdep roam free. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190816121000.8507-1-chris@chris-wilson.co.uk
156 lines
3.8 KiB
C
156 lines
3.8 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2019 Intel Corporation
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*/
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#ifndef __INTEL_CONTEXT_H__
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#define __INTEL_CONTEXT_H__
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#include <linux/lockdep.h>
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#include "i915_active.h"
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#include "intel_context_types.h"
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#include "intel_engine_types.h"
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#include "intel_timeline_types.h"
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void intel_context_init(struct intel_context *ce,
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struct i915_gem_context *ctx,
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struct intel_engine_cs *engine);
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void intel_context_fini(struct intel_context *ce);
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struct intel_context *
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intel_context_create(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine);
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void intel_context_free(struct intel_context *ce);
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/**
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* intel_context_lock_pinned - Stablises the 'pinned' status of the HW context
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* @ce - the context
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*
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* Acquire a lock on the pinned status of the HW context, such that the context
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* can neither be bound to the GPU or unbound whilst the lock is held, i.e.
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* intel_context_is_pinned() remains stable.
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*/
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static inline int intel_context_lock_pinned(struct intel_context *ce)
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__acquires(ce->pin_mutex)
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{
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return mutex_lock_interruptible(&ce->pin_mutex);
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}
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/**
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* intel_context_is_pinned - Reports the 'pinned' status
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* @ce - the context
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*
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* While in use by the GPU, the context, along with its ring and page
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* tables is pinned into memory and the GTT.
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*
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* Returns: true if the context is currently pinned for use by the GPU.
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*/
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static inline bool
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intel_context_is_pinned(struct intel_context *ce)
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{
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return atomic_read(&ce->pin_count);
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}
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/**
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* intel_context_unlock_pinned - Releases the earlier locking of 'pinned' status
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* @ce - the context
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*
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* Releases the lock earlier acquired by intel_context_unlock_pinned().
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*/
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static inline void intel_context_unlock_pinned(struct intel_context *ce)
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__releases(ce->pin_mutex)
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{
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mutex_unlock(&ce->pin_mutex);
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}
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int __intel_context_do_pin(struct intel_context *ce);
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static inline int intel_context_pin(struct intel_context *ce)
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{
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if (likely(atomic_inc_not_zero(&ce->pin_count)))
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return 0;
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return __intel_context_do_pin(ce);
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}
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static inline void __intel_context_pin(struct intel_context *ce)
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{
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GEM_BUG_ON(!intel_context_is_pinned(ce));
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atomic_inc(&ce->pin_count);
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}
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void intel_context_unpin(struct intel_context *ce);
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void intel_context_enter_engine(struct intel_context *ce);
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void intel_context_exit_engine(struct intel_context *ce);
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static inline void intel_context_enter(struct intel_context *ce)
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{
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lockdep_assert_held(&ce->timeline->mutex);
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if (!ce->active_count++)
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ce->ops->enter(ce);
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}
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static inline void intel_context_mark_active(struct intel_context *ce)
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{
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lockdep_assert_held(&ce->timeline->mutex);
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++ce->active_count;
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}
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static inline void intel_context_exit(struct intel_context *ce)
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{
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lockdep_assert_held(&ce->timeline->mutex);
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GEM_BUG_ON(!ce->active_count);
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if (!--ce->active_count)
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ce->ops->exit(ce);
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}
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int intel_context_active_acquire(struct intel_context *ce);
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void intel_context_active_release(struct intel_context *ce);
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static inline struct intel_context *intel_context_get(struct intel_context *ce)
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{
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kref_get(&ce->ref);
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return ce;
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}
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static inline void intel_context_put(struct intel_context *ce)
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{
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kref_put(&ce->ref, ce->ops->destroy);
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}
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static inline struct intel_timeline *__must_check
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intel_context_timeline_lock(struct intel_context *ce)
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__acquires(&ce->timeline->mutex)
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{
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struct intel_timeline *tl = ce->timeline;
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int err;
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err = mutex_lock_interruptible(&tl->mutex);
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if (err)
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return ERR_PTR(err);
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return tl;
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}
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static inline void intel_context_timeline_unlock(struct intel_timeline *tl)
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__releases(&tl->mutex)
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{
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mutex_unlock(&tl->mutex);
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}
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int intel_context_prepare_remote_request(struct intel_context *ce,
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struct i915_request *rq);
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struct i915_request *intel_context_create_request(struct intel_context *ce);
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static inline struct intel_ring *__intel_context_ring_size(u64 sz)
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{
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return u64_to_ptr(struct intel_ring, sz);
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}
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#endif /* __INTEL_CONTEXT_H__ */
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