From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Subject: Re: [PATCH 03/13] drm/i915: pass seqno to
	i915_hangcheck_ring_idle
Date: Fri, 01 Mar 2013 15:49:48 +0200
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To: Ben Widawsky <ben@bwidawsk.net>
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Ben Widawsky <ben@bwidawsk.net> writes:

> On Tue, Feb 26, 2013 at 01:05:06PM +0200, Mika Kuoppala wrote:
>> In preparation for next commit, pass seqno as a parameter
>> to i915_hangcheck_ring_idle as it will be used inside
>> i915_hangcheck_elapsed.
>> 
>> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
>> ---
>>  drivers/gpu/drm/i915/i915_irq.c |   11 +++++++----
>>  1 file changed, 7 insertions(+), 4 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index 29037e0..4f60c87 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -1740,11 +1740,11 @@ ring_last_seqno(struct intel_ring_buffer *ring)
>>  			  struct drm_i915_gem_request, list)->seqno;
>>  }
>>  
>> -static bool i915_hangcheck_ring_idle(struct intel_ring_buffer *ring, bool *err)
>> +static bool i915_hangcheck_ring_idle(struct intel_ring_buffer *ring,
>> +				     u32 ring_seqno, bool *err)
>>  {
>>  	if (list_empty(&ring->request_list) ||
>> -	    i915_seqno_passed(ring->get_seqno(ring, false),
>> -			      ring_last_seqno(ring))) {
>> +	    i915_seqno_passed(ring_seqno, ring_last_seqno(ring))) {
>>  		/* Issue a wake-up to catch stuck h/w. */
>>  		if (waitqueue_active(&ring->irq_queue)) {
>>  			DRM_ERROR("Hangcheck timer elapsed... %s idle\n",
>
> I think just return err. Don't bother with a bool and *err return.

They have different meaning in here. Or do you suggest that
i return int with error and encode waiting/non waiting in return value?

-Mika


>> @@ -1821,7 +1821,10 @@ void i915_hangcheck_elapsed(unsigned long data)
>>  	memset(acthd, 0, sizeof(acthd));
>>  	idle = true;
>>  	for_each_ring(ring, dev_priv, i) {
>> -	    idle &= i915_hangcheck_ring_idle(ring, &err);
>> +		u32 seqno;
>> +
>> +		seqno = ring->get_seqno(ring, false);
>> +		idle &= i915_hangcheck_ring_idle(ring, seqno, &err);
>>  	    acthd[i] = intel_ring_get_active_head(ring);
>>  	}
>>  
> -- 
> Ben Widawsky, Intel Open Source Technology Center