1/*
 2 * Copyright © 2016 Intel Corporation
 3 *
 4 * Permission is hereby granted, free of charge, to any person obtaining a
 5 * copy of this software and associated documentation files (the "Software"),
 6 * to deal in the Software without restriction, including without limitation
 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 8 * and/or sell copies of the Software, and to permit persons to whom the
 9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 */
24
25#include "i915_drv.h"
26
27static int __i915_gem_timeline_init(struct drm_i915_private *i915,
28				    struct i915_gem_timeline *timeline,
29				    const char *name,
30				    struct lock_class_key *lockclass,
31				    const char *lockname)
32{
33	unsigned int i;
34	u64 fences;
35
36	lockdep_assert_held(&i915->drm.struct_mutex);
37
38	timeline->i915 = i915;
39	timeline->name = kstrdup(name ?: "[kernel]", GFP_KERNEL);
40	if (!timeline->name)
41		return -ENOMEM;
42
43	list_add(&timeline->link, &i915->gt.timelines);
44
45	/* Called during early_init before we know how many engines there are */
46	fences = dma_fence_context_alloc(ARRAY_SIZE(timeline->engine));
47	for (i = 0; i < ARRAY_SIZE(timeline->engine); i++) {
48		struct intel_timeline *tl = &timeline->engine[i];
49
50		tl->fence_context = fences++;
51		tl->common = timeline;
52#ifdef CONFIG_DEBUG_SPINLOCK
53		__raw_spin_lock_init(&tl->lock.rlock, lockname, lockclass);
54#else
55		spin_lock_init(&tl->lock);
56#endif
57		init_request_active(&tl->last_request, NULL);
58		INIT_LIST_HEAD(&tl->requests);
59	}
60
61	return 0;
62}
63
64int i915_gem_timeline_init(struct drm_i915_private *i915,
65			   struct i915_gem_timeline *timeline,
66			   const char *name)
67{
68	static struct lock_class_key class;
69
70	return __i915_gem_timeline_init(i915, timeline, name,
71					&class, "&timeline->lock");
72}
73
74int i915_gem_timeline_init__global(struct drm_i915_private *i915)
75{
76	static struct lock_class_key class;
77
78	return __i915_gem_timeline_init(i915,
79					&i915->gt.global_timeline,
80					"[execution]",
81					&class, "&global_timeline->lock");
82}
83
84void i915_gem_timeline_fini(struct i915_gem_timeline *tl)
85{
86	lockdep_assert_held(&tl->i915->drm.struct_mutex);
87
88	list_del(&tl->link);
89	kfree(tl->name);
90}