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d8af05ff38
By placing our idle-barriers in the i915_active fence tree, we expose those for reuse by other components that are issuing requests along the kernel_context. Reusing the proto-barrier active_node is perfectly fine as the new request implies a context-switch, and so an opportune point to run the idle-barrier. However, the proto-barrier is not equivalent to a normal active_node and care must be taken to avoid dereferencing the ERR_PTR used as its request marker. v2: Comment the more egregious cheek v3: A glossary! Reported-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Fixes:ce476c80b8("drm/i915: Keep contexts pinned until after the next kernel context switch") Fixes:a9877da2d6("drm/i915/oa: Reconfigure contexts on the fly") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190802100015.1281-1-chris@chris-wilson.co.uk
48 lines
960 B
C
48 lines
960 B
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 _I915_ACTIVE_TYPES_H_
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#define _I915_ACTIVE_TYPES_H_
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#include <linux/atomic.h>
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#include <linux/llist.h>
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#include <linux/mutex.h>
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#include <linux/rbtree.h>
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#include <linux/rcupdate.h>
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struct drm_i915_private;
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struct i915_active_request;
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struct i915_request;
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typedef void (*i915_active_retire_fn)(struct i915_active_request *,
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struct i915_request *);
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struct i915_active_request {
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struct i915_request __rcu *request;
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struct list_head link;
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i915_active_retire_fn retire;
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};
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struct active_node;
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struct i915_active {
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struct drm_i915_private *i915;
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struct active_node *cache;
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struct rb_root tree;
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struct mutex mutex;
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atomic_t count;
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unsigned long flags;
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#define I915_ACTIVE_GRAB_BIT 0
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int (*active)(struct i915_active *ref);
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void (*retire)(struct i915_active *ref);
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struct llist_head preallocated_barriers;
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};
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#endif /* _I915_ACTIVE_TYPES_H_ */
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