Re: [PATCH v2 2/6] drm/i915: Refactor PSR status debugfs

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Wed, Jan 09, 2019 at 02:34:36PM -0800, Dhinakaran Pandiyan wrote:
> On Thu, 2019-01-03 at 06:21 -0800, José Roberto de Souza wrote:
> > The old debugfs fields was not following a naming partern and it was
> > a bit confusing.
> > 
> > So it went from:
> > ~$ sudo more /sys/kernel/debug/dri/0/i915_edp_psr_status
> > Sink_Support: yes
> > PSR mode: PSR1
> > Enabled: yes
> > Busy frontbuffer bits: 0x000
> > Main link in standby mode: no
> > HW Enabled & Active bit: yes
> > Source PSR status: 0x24050006 [SRDONACK]
> > 
> > To:
> > ~$ sudo more /sys/kernel/debug/dri/0/i915_edp_psr_status
> > Sink support: yes [0x03]
> > PSR mode: PSR1 enabled
> > Source PSR ctl: enabled [0x81f00e26]
> > Source PSR status: IDLE [0x04010006]
> > Busy frontbuffer bits: 0x00000000
> > 
> > The 'Main link in standby mode' was removed as it is not useful but
> > if needed by someone the information is still in the register value
> > of 'Source PSR ctl' inside of the brackets, PSR mode and Enabled was
> > squashed into PSR mode, some renames and reorders and we have this
> > cleaner version. This will also make easy to parse debugfs for IGT
> > tests.
> > 
> > v2: Printing sink PSR version with only 2 hex digits as it is a byte
> > 
> > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> > Suggested-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> > Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_debugfs.c | 95 ++++++++++++++-------------
> > --
> >  1 file changed, 47 insertions(+), 48 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> > b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 193823048f96..1a31921598e7 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -2529,7 +2529,8 @@ DEFINE_SHOW_ATTRIBUTE(i915_psr_sink_status);
> >  static void
> >  psr_source_status(struct drm_i915_private *dev_priv, struct seq_file
> > *m)
> >  {
> > -	u32 val, psr_status;
> > +	u32 val, status_val;
> > +	const char *status = "unknown";
> >  
> >  	if (dev_priv->psr.psr2_enabled) {
> >  		static const char * const live_status[] = {
> > @@ -2545,14 +2546,11 @@ psr_source_status(struct drm_i915_private
> > *dev_priv, struct seq_file *m)
> >  			"BUF_ON",
> >  			"TG_ON"
> >  		};
> > -		psr_status = I915_READ(EDP_PSR2_STATUS);
> > -		val = (psr_status & EDP_PSR2_STATUS_STATE_MASK) >>
> > -			EDP_PSR2_STATUS_STATE_SHIFT;
> > -		if (val < ARRAY_SIZE(live_status)) {
> > -			seq_printf(m, "Source PSR status: 0x%x [%s]\n",
> > -				   psr_status, live_status[val]);
> > -			return;
> > -		}
> > +		val = I915_READ(EDP_PSR2_STATUS);
> > +		status_val = (val & EDP_PSR2_STATUS_STATE_MASK) >>
> > +			      EDP_PSR2_STATUS_STATE_SHIFT;
> > +		if (status_val < ARRAY_SIZE(live_status))
> > +			status = live_status[status_val];
> >  	} else {
> >  		static const char * const live_status[] = {
> >  			"IDLE",
> > @@ -2564,74 +2562,75 @@ psr_source_status(struct drm_i915_private
> > *dev_priv, struct seq_file *m)
> >  			"SRDOFFACK",
> >  			"SRDENT_ON",
> >  		};
> > -		psr_status = I915_READ(EDP_PSR_STATUS);
> > -		val = (psr_status & EDP_PSR_STATUS_STATE_MASK) >>
> > -			EDP_PSR_STATUS_STATE_SHIFT;
> > -		if (val < ARRAY_SIZE(live_status)) {
> > -			seq_printf(m, "Source PSR status: 0x%x [%s]\n",
> > -				   psr_status, live_status[val]);
> > -			return;
> > -		}
> > +		val = I915_READ(EDP_PSR_STATUS);
> > +		status_val = (val & EDP_PSR_STATUS_STATE_MASK) >>
> > +			      EDP_PSR_STATUS_STATE_SHIFT;
> > +		if (status_val < ARRAY_SIZE(live_status))
> > +			status = live_status[status_val];
> >  	}
> >  
> > -	seq_printf(m, "Source PSR status: 0x%x [%s]\n", psr_status,
> > "unknown");
> > +	seq_printf(m, "Source PSR status: %s [0x%08x]\n", status, val);
> >  }
> >  
> >  static int i915_edp_psr_status(struct seq_file *m, void *data)
> >  {
> >  	struct drm_i915_private *dev_priv = node_to_i915(m->private);
> > -	u32 psrperf = 0;
> > -	bool enabled = false;
> > -	bool sink_support;
> > +	struct i915_psr *psr = &dev_priv->psr;
> > +	const char *status;
> > +	bool enabled;
> > +	u32 val;
> >  
> >  	if (!HAS_PSR(dev_priv))
> >  		return -ENODEV;
> >  
> > -	sink_support = dev_priv->psr.sink_support;
> > -	seq_printf(m, "Sink_Support: %s\n", yesno(sink_support));
> > -	if (!sink_support)
> > +	seq_printf(m, "Sink support: %s", yesno(psr->sink_support));
> > +	seq_printf(m, " [0x%02x]\n", psr->dp->psr_dpcd[0]);
> > +	if (!psr->sink_support)
> >  		return 0;
> >  
> >  	intel_runtime_pm_get(dev_priv);
> > +	mutex_lock(&psr->lock);
> >  
> > -	mutex_lock(&dev_priv->psr.lock);
> > -	seq_printf(m, "PSR mode: %s\n",
> > -		   dev_priv->psr.psr2_enabled ? "PSR2" : "PSR1");
> > -	seq_printf(m, "Enabled: %s\n", yesno(dev_priv->psr.enabled));
> > -	seq_printf(m, "Busy frontbuffer bits: 0x%03x\n",
> > -		   dev_priv->psr.busy_frontbuffer_bits);
> > -
> > -	if (dev_priv->psr.psr2_enabled)
> > -		enabled = I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE;
> > +	if (psr->enabled)
> > +		status = psr->psr2_enabled ? "PSR2 enabled" : "PSR1
> > enabled";
> >  	else
> > -		enabled = I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE;
> > +		status = "disabled";
> > +	seq_printf(m, "PSR mode: %s\n", status);
> >  
> > -	seq_printf(m, "Main link in standby mode: %s\n",
> > -		   yesno(dev_priv->psr.link_standby));
> > +	if (!psr->enabled)
> > +		goto unlock;
> >  
> > -	seq_printf(m, "HW Enabled & Active bit: %s\n", yesno(enabled));
> > +	if (psr->psr2_enabled) {
> > +		val = I915_READ(EDP_PSR2_CTL);
> > +		enabled = val & EDP_PSR2_ENABLE;
> > +	} else {
> > +		val = I915_READ(EDP_PSR_CTL);
> > +		enabled = val & EDP_PSR_ENABLE;
> > +	}
> > +	seq_printf(m, "Source PSR ctl: %s [0x%08x]\n",
> > +		   enableddisabled(enabled), val);
> > +	psr_source_status(dev_priv, m);
> > +	seq_printf(m, "Busy frontbuffer bits: 0x%08x\n",
> > +		   psr->busy_frontbuffer_bits);
> >  
> >  	/*
> >  	 * SKL+ Perf counter is reset to 0 everytime DC state is
> > entered
> >  	 */
> The counter is probably still useful for debugging along with
> i915.enable_dc = 0, allows us to isolate PSR from DMC. That's something
> to explore in the future; this patch lgtm

yeap... we just need to be careful how to expose it to avoid
the confusion of people thinking PSR is broken only because
counter got reset...

> Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> 
> 
> However, I suggest get an ack Rodrigo.

Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

> 
> 
> >  	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
> > -		psrperf = I915_READ(EDP_PSR_PERF_CNT) &
> > -			EDP_PSR_PERF_CNT_MASK;
> > -
> > -		seq_printf(m, "Performance_Counter: %u\n", psrperf);
> > +		val = I915_READ(EDP_PSR_PERF_CNT) &
> > EDP_PSR_PERF_CNT_MASK;
> > +		seq_printf(m, "Performance counter: %u\n", val);
> >  	}
> >  
> > -	psr_source_status(dev_priv, m);
> > -	mutex_unlock(&dev_priv->psr.lock);
> > -
> > -	if (READ_ONCE(dev_priv->psr.debug) & I915_PSR_DEBUG_IRQ) {
> > +	if (psr->debug & I915_PSR_DEBUG_IRQ) {
> >  		seq_printf(m, "Last attempted entry at: %lld\n",
> > -			   dev_priv->psr.last_entry_attempt);
> > -		seq_printf(m, "Last exit at: %lld\n",
> > -			   dev_priv->psr.last_exit);
> > +			   psr->last_entry_attempt);
> > +		seq_printf(m, "Last exit at: %lld\n", psr->last_exit);
> >  	}
> >  
> > +unlock:
> > +	mutex_unlock(&psr->lock);
> >  	intel_runtime_pm_put(dev_priv);
> > +
> >  	return 0;
> >  }
> >  
> 
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