drivers/gpu/drm/i915/i915_timeline.h

   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 #ifndef I915_TIMELINE_H
  26 #define I915_TIMELINE_H
  27
  28 #include <linux/list.h>
  29 #include <linux/kref.h>
  30
  31 #include "i915_request.h"
  32 #include "i915_syncmap.h"
  33 #include "i915_utils.h"
  34
  35 struct i915_timeline {
  36         u64 fence_context;
  37         u32 seqno;
  38
  39         spinlock_t lock;
  40 #define TIMELINE_CLIENT 0 /* default subclass */
  41 #define TIMELINE_ENGINE 1
  42
  43         /**
  44          * List of breadcrumbs associated with GPU requests currently
  45          * outstanding.
  46          */
  47         struct list_head requests;
  48
  49         /* Contains an RCU guarded pointer to the last request. No reference is
  50          * held to the request, users must carefully acquire a reference to
  51          * the request using i915_gem_active_get_request_rcu(), or hold the
  52          * struct_mutex.
  53          */
  54         struct i915_gem_active last_request;
  55
  56         /**
  57          * We track the most recent seqno that we wait on in every context so
  58          * that we only have to emit a new await and dependency on a more
  59          * recent sync point. As the contexts may be executed out-of-order, we
  60          * have to track each individually and can not rely on an absolute
  61          * global_seqno. When we know that all tracked fences are completed
  62          * (i.e. when the driver is idle), we know that the syncmap is
  63          * redundant and we can discard it without loss of generality.
  64          */
  65         struct i915_syncmap *sync;
  66         /**
  67          * Separately to the inter-context seqno map above, we track the last
  68          * barrier (e.g. semaphore wait) to the global engine timelines. Note
  69          * that this tracks global_seqno rather than the context.seqno, and
  70          * so it is subject to the limitations of hw wraparound and that we
  71          * may need to revoke global_seqno (on pre-emption).
  72          */
  73         u32 global_sync[I915_NUM_ENGINES];
  74
  75         struct list_head link;
  76         const char *name;
  77
  78         struct kref kref;
  79 };
  80
  81 void i915_timeline_init(struct drm_i915_private *i915,
  82                         struct i915_timeline *tl,
  83                         const char *name);
  84 void i915_timeline_fini(struct i915_timeline *tl);
  85
  86 struct i915_timeline *
  87 i915_timeline_create(struct drm_i915_private *i915, const char *name);
  88
  89 static inline struct i915_timeline *
  90 i915_timeline_get(struct i915_timeline *timeline)
  91 {
  92         kref_get(&timeline->kref);
  93         return timeline;
  94 }
  95
  96 void __i915_timeline_free(struct kref *kref);
  97 static inline void i915_timeline_put(struct i915_timeline *timeline)
  98 {
  99         kref_put(&timeline->kref, __i915_timeline_free);
 100 }
 101
 102 static inline int __i915_timeline_sync_set(struct i915_timeline *tl,
 103                                            u64 context, u32 seqno)
 104 {
 105         return i915_syncmap_set(&tl->sync, context, seqno);
 106 }
 107
 108 static inline int i915_timeline_sync_set(struct i915_timeline *tl,
 109                                          const struct dma_fence *fence)
 110 {
 111         return __i915_timeline_sync_set(tl, fence->context, fence->seqno);
 112 }
 113
 114 static inline bool __i915_timeline_sync_is_later(struct i915_timeline *tl,
 115                                                  u64 context, u32 seqno)
 116 {
 117         return i915_syncmap_is_later(&tl->sync, context, seqno);
 118 }
 119
 120 static inline bool i915_timeline_sync_is_later(struct i915_timeline *tl,
 121                                                const struct dma_fence *fence)
 122 {
 123         return __i915_timeline_sync_is_later(tl, fence->context, fence->seqno);
 124 }
 125
 126 void i915_timelines_park(struct drm_i915_private *i915);
 127
 128 #endif