| /* |
| * Copyright © 2016 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| * |
| */ |
| |
| #ifndef I915_GEM_TIMELINE_H |
| #define I915_GEM_TIMELINE_H |
| |
| #include <linux/list.h> |
| |
| #include "i915_utils.h" |
| #include "i915_gem_request.h" |
| #include "i915_syncmap.h" |
| |
| struct i915_gem_timeline; |
| |
| struct intel_timeline { |
| u64 fence_context; |
| u32 seqno; |
| |
| /** |
| * Count of outstanding requests, from the time they are constructed |
| * to the moment they are retired. Loosely coupled to hardware. |
| */ |
| u32 inflight_seqnos; |
| |
| spinlock_t lock; |
| |
| /** |
| * List of breadcrumbs associated with GPU requests currently |
| * outstanding. |
| */ |
| struct list_head requests; |
| |
| /* Contains an RCU guarded pointer to the last request. No reference is |
| * held to the request, users must carefully acquire a reference to |
| * the request using i915_gem_active_get_request_rcu(), or hold the |
| * struct_mutex. |
| */ |
| struct i915_gem_active last_request; |
| |
| /** |
| * We track the most recent seqno that we wait on in every context so |
| * that we only have to emit a new await and dependency on a more |
| * recent sync point. As the contexts may be executed out-of-order, we |
| * have to track each individually and can not rely on an absolute |
| * global_seqno. When we know that all tracked fences are completed |
| * (i.e. when the driver is idle), we know that the syncmap is |
| * redundant and we can discard it without loss of generality. |
| */ |
| struct i915_syncmap *sync; |
| /** |
| * Separately to the inter-context seqno map above, we track the last |
| * barrier (e.g. semaphore wait) to the global engine timelines. Note |
| * that this tracks global_seqno rather than the context.seqno, and |
| * so it is subject to the limitations of hw wraparound and that we |
| * may need to revoke global_seqno (on pre-emption). |
| */ |
| u32 global_sync[I915_NUM_ENGINES]; |
| |
| struct i915_gem_timeline *common; |
| }; |
| |
| struct i915_gem_timeline { |
| struct list_head link; |
| |
| struct drm_i915_private *i915; |
| const char *name; |
| |
| struct intel_timeline engine[I915_NUM_ENGINES]; |
| }; |
| |
| int i915_gem_timeline_init(struct drm_i915_private *i915, |
| struct i915_gem_timeline *tl, |
| const char *name); |
| int i915_gem_timeline_init__global(struct drm_i915_private *i915); |
| void i915_gem_timelines_park(struct drm_i915_private *i915); |
| void i915_gem_timeline_fini(struct i915_gem_timeline *tl); |
| |
| static inline int __intel_timeline_sync_set(struct intel_timeline *tl, |
| u64 context, u32 seqno) |
| { |
| return i915_syncmap_set(&tl->sync, context, seqno); |
| } |
| |
| static inline int intel_timeline_sync_set(struct intel_timeline *tl, |
| const struct dma_fence *fence) |
| { |
| return __intel_timeline_sync_set(tl, fence->context, fence->seqno); |
| } |
| |
| static inline bool __intel_timeline_sync_is_later(struct intel_timeline *tl, |
| u64 context, u32 seqno) |
| { |
| return i915_syncmap_is_later(&tl->sync, context, seqno); |
| } |
| |
| static inline bool intel_timeline_sync_is_later(struct intel_timeline *tl, |
| const struct dma_fence *fence) |
| { |
| return __intel_timeline_sync_is_later(tl, fence->context, fence->seqno); |
| } |
| |
| #endif |