Re: [PATCH 7/7] drm/i915/guc: Add support for define guc_log_size in megabytes.

["Piorkowski, Piotr" <piotr.piorkowski@intel.com>]

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On Wed, 2018-05-30 at 18:46 +0200, Michal Wajdeczko wrote:
> On Wed, 30 May 2018 15:53:34 +0200, Piotr Piorkowski  
> <piotr.piorkowski@intel.com> wrote:
> 
> > At this moment we can define GuC logs sizes only using pages.
> > But GuC also allows use for this values expressed in megabytes.
> > Lets add support for define guc_log_size in megabytes when we
> > debug of GuC.
> > 
> > Signed-off-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
> > Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
> > Cc: Michał Winiarski <michal.winiarski@intel.com>
> > Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> > Cc: Chris Wilson <chris@chris-wilson.co.uk>
> > ---
> >  drivers/gpu/drm/i915/intel_guc.c     | 12 ++++++++++--
> >  drivers/gpu/drm/i915/intel_guc_log.h |  6 ++++++
> >  2 files changed, 16 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_guc.c  
> > b/drivers/gpu/drm/i915/intel_guc.c
> > index e15047fedb45..5a42db47521b 100644
> > --- a/drivers/gpu/drm/i915/intel_guc.c
> > +++ b/drivers/gpu/drm/i915/intel_guc.c
> > @@ -263,7 +263,13 @@ static u32 guc_ctl_log_params_flags(struct  
> > intel_guc *guc)
> >  	u32 offset = intel_guc_ggtt_offset(guc, guc->log.vma) >>
> > PAGE_SHIFT;
> >  	u32 flags;
> > +	#if (((CRASH_BUFFER_SIZE) % (1 << 20)) == 0)
> > +	#define UNIT (1 << 20)
> > +	#define FLAG GUC_LOG_ALLOC_IN_MEGABYTE
> > +	#else
> >  	#define UNIT (4 << 10)
> > +	#define FLAG 0
> > +	#endif
> > 	BUILD_BUG_ON(!CRASH_BUFFER_SIZE);
> >  	BUILD_BUG_ON(!IS_ALIGNED(CRASH_BUFFER_SIZE, UNIT));
> > @@ -280,13 +286,15 @@ static u32 guc_ctl_log_params_flags(struct  
> > intel_guc *guc)
> >  			(GUC_LOG_ISR_MASK >> GUC_LOG_ISR_SHIFT));
> > 	flags = GUC_LOG_VALID |
> > -		GUC_LOG_NOTIFY_ON_HALF_FULL |
> > -		((CRASH_BUFFER_SIZE/UNIT - 1) <<
> > GUC_LOG_CRASH_SHIFT) |
> > +		GUC_LOG_NOTIFY_ON_HALF_FULL;
> > +	flags |= FLAG;
> 
> I think you can inject FLAG into existing statement without
> introducing two additional |=
> 
> > +	flags |= ((CRASH_BUFFER_SIZE/UNIT - 1) <<
> > GUC_LOG_CRASH_SHIFT) |
> >  		((DPC_BUFFER_SIZE/UNIT - 1) << GUC_LOG_DPC_SHIFT)
> > |
> >  		((ISR_BUFFER_SIZE/UNIT - 1) << GUC_LOG_ISR_SHIFT)
> > |
> >  		(offset << GUC_LOG_BUF_ADDR_SHIFT);
> > 	#undef UNIT
> > +	#undef FLAG
> > 	return flags;
> >  }
> > diff --git a/drivers/gpu/drm/i915/intel_guc_log.h  
> > b/drivers/gpu/drm/i915/intel_guc_log.h
> > index 1b3afdae6d0d..de39b965ae7a 100644
> > --- a/drivers/gpu/drm/i915/intel_guc_log.h
> > +++ b/drivers/gpu/drm/i915/intel_guc_log.h
> > @@ -34,9 +34,15 @@
> > struct intel_guc;
> > +#ifdef DRM_I915_DEBUG_GUC
> > +#define CRASH_BUFFER_SIZE	2097152
> > +#define DPC_BUFFER_SIZE		8388608
> > +#define ISR_BUFFER_SIZE		8388608
> 
> can we make it more friendly: (8 * 1024 * 1024)
> 
> > +#else
> >  #define CRASH_BUFFER_SIZE	8192
> >  #define DPC_BUFFER_SIZE		32768
> >  #define ISR_BUFFER_SIZE		32768
> > +#endif
> 
> btw, are these values just max possible or selected
> as most valuable ? question for both debug/ndebug

For debug I use the possibility of defining values in MB and I set the
maximum possible values, and for ndebug I set old values of these
buffers
> 
> Michal
> 
> > /*
> >   * While we're using plain log level in i915, GuC controls are
> > much  
> > more...

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