linux-kernel - Re: [PATCH 6/6] drm/msm/gpu: add ocmem init/cleanup functions

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Date:   Sun, 16 Jun 2019 20:43:51 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     agross@...nel.org, david.brown@...aro.org, robdclark@...il.com,
        sean@...rly.run, robh+dt@...nel.org, airlied@...ux.ie,
        daniel@...ll.ch, mark.rutland@....com, jonathan@...ek.ca,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 6/6] drm/msm/gpu: add ocmem init/cleanup functions

On Sun 16 Jun 17:18 PDT 2019, Brian Masney wrote:

> Hi Bjorn,
> 
> On Sun, Jun 16, 2019 at 11:06:33AM -0700, Bjorn Andersson wrote:
> > > diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> > > index 6f7f4114afcf..e0a9409c8a32 100644
> > > --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> > > +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> > > @@ -29,6 +29,10 @@
> > >  #include "msm_gem.h"
> > >  #include "msm_mmu.h"
> > >  
> > > +#ifdef CONFIG_QCOM_OCMEM
> > > +#  include <soc/qcom/ocmem.h>
> > > +#endif
> > 
> > This file exists (after the previous patch), so no need to make its
> > inclusion conditional.
> > 
> > > +
> > >  static bool zap_available = true;
> > >  
> > >  static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname,
> > > @@ -897,6 +901,43 @@ static int adreno_get_pwrlevels(struct device *dev,
> > >  	return 0;
> > >  }
> > >  
> > > +int adreno_gpu_ocmem_init(struct device *dev, struct adreno_gpu *adreno_gpu,
> > > +			  struct adreno_ocmem *adreno_ocmem)
> > > +{
> > > +#ifdef CONFIG_QCOM_OCMEM
> > 
> > No need to make this conditional.
> 
> I have these #ifdefs for the a5xx and a6xx GPUs that don't have ocmem
> in the SoC. Without the #ifdefs, those systems would need to have the
> ocmem driver in their kernel.
> 

In order to provide the means for compiling a kernel for a[56]xx without
having to compile ocmem you should move these #ifdef to the ocmem
header file and provide static inline dummies for the case when it's
not.

(and use #if IS_ENABLED(CONFIG_FOO))

Don't forget to add
	depends on QCOM_OCMEM || QCOM_OCMEM=n

to the DRM_MSM config option, to allow the driver pair to be selected in
all possible ways.

> Thanks for the quick review on the patch set!
> 

Regards,
Bjorn