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drm/i915: Initialise basic fence before acquiring seqno 

Inside the intel_timeline_get_seqno(), we currently track the retirement
of the old cachelines by listening to the new request. This requires
that the new request is ready to be used and so requires a minimum bit
of initialisation prior to getting the new seqno.

Fixes: b1e3177bd1 ("drm/i915: Coordinate i915_active with its own mutex")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200203094152.4150550-2-chris@chris-wilson.co.uk
(cherry picked from commit 855e39e65c)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2020-02-03 09:41:48 +00:00 committed by Jani Nikula
parent dea8d5ce46
commit c01e8da2cd
1 changed files with 14 additions and 7 deletions
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21
drivers/gpu/drm/i915/i915_request.c
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@ -595,6 +595,8 @@ static void __i915_request_ctor(void *arg)
i915_sw_fence_init(&rq->submit, submit_notify);
i915_sw_fence_init(&rq->semaphore, semaphore_notify);
dma_fence_init(&rq->fence, &i915_fence_ops, &rq->lock, 0, 0);
rq->file_priv = NULL;
rq->capture_list = NULL;
@ -653,25 +655,30 @@ __i915_request_create(struct intel_context *ce, gfp_t gfp)
}
}
ret = intel_timeline_get_seqno(tl, rq, &seqno);
if (ret)
goto err_free;
rq->i915 = ce->engine->i915;
rq->context = ce;
rq->engine = ce->engine;
rq->ring = ce->ring;
rq->execution_mask = ce->engine->mask;
kref_init(&rq->fence.refcount);
rq->fence.flags = 0;
rq->fence.error = 0;
INIT_LIST_HEAD(&rq->fence.cb_list);
ret = intel_timeline_get_seqno(tl, rq, &seqno);
if (ret)
goto err_free;
rq->fence.context = tl->fence_context;
rq->fence.seqno = seqno;
RCU_INIT_POINTER(rq->timeline, tl);
RCU_INIT_POINTER(rq->hwsp_cacheline, tl->hwsp_cacheline);
rq->hwsp_seqno = tl->hwsp_seqno;
rq->rcustate = get_state_synchronize_rcu(); /* acts as smp_mb() */
dma_fence_init(&rq->fence, &i915_fence_ops, &rq->lock,
tl->fence_context, seqno);
/* We bump the ref for the fence chain */
i915_sw_fence_reinit(&i915_request_get(rq)->submit);
i915_sw_fence_reinit(&i915_request_get(rq)->semaphore);