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drm/i915/execlists: Ignore tracek for nop process_csb 

Recording the frequent inspection of CSB head/tail when there is
expected to be no update adds noise to the debug trace. (Not entirely
useless, but since we know the sequence of function calls, we can
surmise the function was called -- so redundant.)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200209131922.180287-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-02-09 13:19:16 +00:00
parent 26208d876d
commit 7d7569ac33
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/gt/intel_lrc.c
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@ -2248,7 +2248,6 @@ static void process_csb(struct intel_engine_cs *engine)
*/ */
head = execlists->csb_head; head = execlists->csb_head;
tail = READ_ONCE(*execlists->csb_write); tail = READ_ONCE(*execlists->csb_write);
ENGINE_TRACE(engine, "cs-irq head=%d, tail=%d\n", head, tail);
if (unlikely(head == tail)) if (unlikely(head == tail))
return; return;
@ -2262,6 +2261,7 @@ static void process_csb(struct intel_engine_cs *engine)
*/ */
rmb(); rmb();
ENGINE_TRACE(engine, "cs-irq head=%d, tail=%d\n", head, tail);
do { do {
bool promote; bool promote;