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drm/i915: Only queue requests during execlists submission

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Leave the more complicated request dequeueing to the tasklet and instead
just kick start the tasklet if we detect we are adding the first
request.

v2: Play around with list operators until we agree upon something

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160909131201.16673-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-09-09 14:11:42 +01:00
parent e68a139f6b
commit ba49b2f823
1 changed files with 4 additions and 24 deletions
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28
drivers/gpu/drm/i915/intel_lrc.c
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@ -609,35 +609,15 @@ static void intel_lrc_irq_handler(unsigned long data)
static void execlists_submit_request(struct drm_i915_gem_request *request)
{
struct intel_engine_cs *engine = request->engine;
struct drm_i915_gem_request *cursor;
int num_elements = 0;
spin_lock_bh(&engine->execlist_lock);
list_for_each_entry(cursor, &engine->execlist_queue, execlist_link)
if (++num_elements > 2)
break;
if (num_elements > 2) {
struct drm_i915_gem_request *tail_req;
tail_req = list_last_entry(&engine->execlist_queue,
struct drm_i915_gem_request,
execlist_link);
if (request->ctx == tail_req->ctx) {
WARN(tail_req->elsp_submitted != 0,
"More than 2 already-submitted reqs queued\n");
list_del(&tail_req->execlist_link);
i915_gem_request_put(tail_req);
}
}
i915_gem_request_get(request);
list_add_tail(&request->execlist_link, &engine->execlist_queue);
request->ctx_hw_id = request->ctx->hw_id;
if (num_elements == 0)
execlists_unqueue(engine);
if (list_empty(&engine->execlist_queue))
tasklet_hi_schedule(&engine->irq_tasklet);
list_add_tail(&request->execlist_link, &engine->execlist_queue);
spin_unlock_bh(&engine->execlist_lock);
}