[Intel-gfx] [PATCH 1/2] drm/i915/guc: Add GuC Load time to debugfs

[Michal Wajdeczko]

On Thu, Sep 07, 2017 at 09:49:02AM +0100, Tvrtko Ursulin wrote:
> 
> On 07/09/2017 01:37, Anusha Srivatsa wrote:
> > Calculate the time that GuC takes to load.
> > This information could be very useful in
> > determining if GuC is taking unreasonably long time
> > to load in a certain platforms.
> 
> Do we need this in debugfs or a DRM_NOTE or something would be sufficient if
> the load time is above certain threshold?
> 
> Also, what are the typical times here? Are jiffies precise enough? Could be
> only 10ms granularity on some kernels.
> 
> Depending on the above, more or less applicable comments below:
> 
> > v2: Calculate time before logs are collected.
> > Move the guc_load_time variable as a part of
> > intel_uc_fw struct. Store only final result
> > which is to be exported to debugfs. (Michal)
> > Add the load time in the print message as well.
> > 
> > Cc: Sujaritha Sundaresan <sujaritha.sundaresan at intel.com>
> > Cc: Oscar Mateo <oscar.mateo at intel.com>
> > Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
> > Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
> > ---
> >   drivers/gpu/drm/i915/i915_debugfs.c     | 3 +++
> >   drivers/gpu/drm/i915/intel_guc_loader.c | 8 ++++++++
> >   drivers/gpu/drm/i915/intel_uc.h         | 1 +
> >   3 files changed, 12 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 48572b157222..e0b99dbc6608 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -2379,6 +2379,9 @@ static int i915_guc_load_status_info(struct seq_file *m, void *data)
> >   		guc_fw->major_ver_wanted, guc_fw->minor_ver_wanted);
> >   	seq_printf(m, "\tversion found: %d.%d\n",
> >   		guc_fw->major_ver_found, guc_fw->minor_ver_found);
> > +	seq_printf(m, "\tGuC Load time is %lu ms\n",
> > +		   jiffies_to_msecs(guc_fw->guc_load_time));
> 
> OCD: "GuC load time: %lums" to make it more consistent with the other
> entries here?

We can also skip "Guc" prefix as all entries are under "GuC firmware status" 
And maybe better place will be to insert it right after existing "load" entry?
Then output will be:

	GuC firmware status:
		path: i915/xxx.bin
		fetch: SUCCESS
		load: SUCCESS
		load time: 10ms
		...

or we can even try to combine both entries:

	GuC firmware status:
		path: i915/xxx.bin
		fetch: SUCCESS
		load: SUCCESS 10ms
		...

> 
> > +
> >   	seq_printf(m, "\theader: offset is %d; size = %d\n",
> >   		guc_fw->header_offset, guc_fw->header_size);
> >   	seq_printf(m, "\tuCode: offset is %d; size = %d\n",
> > diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
> > index 8b0ae7fce7f2..da917f84c471 100644
> > --- a/drivers/gpu/drm/i915/intel_guc_loader.c
> > +++ b/drivers/gpu/drm/i915/intel_guc_loader.c
> > @@ -199,6 +199,7 @@ static int guc_ucode_xfer_dma(struct drm_i915_private *dev_priv,
> >   	struct sg_table *sg = vma->pages;
> >   	u32 status, rsa[UOS_RSA_SCRATCH_MAX_COUNT];
> >   	int i, ret = 0;
> > +	unsigned long guc_start_load, guc_finish_load;
> >   	/* where RSA signature starts */
> >   	offset = guc_fw->rsa_offset;
> > @@ -226,6 +227,7 @@ static int guc_ucode_xfer_dma(struct drm_i915_private *dev_priv,
> >   	/* Finally start the DMA */
> >   	I915_WRITE(DMA_CTRL, _MASKED_BIT_ENABLE(UOS_MOVE | START_DMA));
> > +	guc_start_load = jiffies;
> >   	/*
> >   	 * Wait for the DMA to complete & the GuC to start up.
> > @@ -237,6 +239,9 @@ static int guc_ucode_xfer_dma(struct drm_i915_private *dev_priv,
> >   	 */
> >   	ret = wait_for(guc_ucode_response(dev_priv, &status), 100);
> > +	guc_finish_load = jiffies;
> > +	guc_fw->guc_load_time = guc_finish_load - guc_start_load;
> 
> Strictly speaking you don't need the guc_finish_load local.
> 
> > +
> >   	DRM_DEBUG_DRIVER("DMA status 0x%x, GuC status 0x%x\n",
> >   			I915_READ(DMA_CTRL), status);
> > @@ -372,6 +377,9 @@ int intel_guc_init_hw(struct intel_guc *guc)
> >   		 guc->fw.path,
> >   		 guc->fw.major_ver_found, guc->fw.minor_ver_found);
> > +	DRM_DEBUG_DRIVER("Time taken to load GuC is %lu\n",
> > +			 guc->fw.guc_load_time);
> > +
> >   	return 0;
> >   }
> > diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
> > index 22ae52b17b0f..52aa05d13863 100644
> > --- a/drivers/gpu/drm/i915/intel_uc.h
> > +++ b/drivers/gpu/drm/i915/intel_uc.h
> > @@ -154,6 +154,7 @@ struct intel_uc_fw {
> >   	uint32_t rsa_offset;
> >   	uint32_t ucode_size;
> >   	uint32_t ucode_offset;
> > +	unsigned long guc_load_time;
> 
> Looks wrong to add guc_ (and later huc_) prefixed members in the common
> struct since both intel_guc and intel_huc encapsulate it. If you just had a
> single field and called it load_time, wouldn't you get separate copies for
> guc and huc automatically?

Additionally, move this new member closer to related "load_status" member.

Regards,
Michal

> 
> Regards,
> 
> Tvrtko
> 
> >   };
> >   struct intel_guc_log {
> > 
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