diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_request.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_request.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h index 4d2784633d9f..943c39d2a62a 100644 --- a/drivers/gpu/drm/i915/i915_gem_request.h +++ b/drivers/gpu/drm/i915/i915_gem_request.h @@ -44,6 +44,28 @@ struct intel_signal_node { struct intel_wait wait; }; +struct i915_dependency { + struct i915_priotree *signaler; + struct list_head signal_link; + struct list_head wait_link; + unsigned long flags; +#define I915_DEPENDENCY_ALLOC BIT(0) +}; + +/* Requests exist in a complex web of interdependencies. Each request + * has to wait for some other request to complete before it is ready to be run + * (e.g. we have to wait until the pixels have been rendering into a texture + * before we can copy from it). We track the readiness of a request in terms + * of fences, but we also need to keep the dependency tree for the lifetime + * of the request (beyond the life of an individual fence). We use the tree + * at various points to reorder the requests whilst keeping the requests + * in order with respect to their various dependencies. + */ +struct i915_priotree { + struct list_head signalers_list; /* those before us, we depend upon */ + struct list_head waiters_list; /* those after us, they depend upon us */ +}; + /** * Request queue structure. * @@ -105,6 +127,17 @@ struct drm_i915_gem_request { wait_queue_t submitq; wait_queue_t execq; + /* A list of everyone we wait upon, and everyone who waits upon us. + * Even though we will not be submitted to the hardware before the + * submit fence is signaled (it waits for all external events as well + * as our own requests), the scheduler still needs to know the + * dependency tree for the lifetime of the request (from execbuf + * to retirement), i.e. bidirectional dependency information for the + * request not tied to individual fences. + */ + struct i915_priotree priotree; + struct i915_dependency dep; + u32 global_seqno; /** GEM sequence number associated with the previous request, |