Re: inux-next: build failure after merge of the drm-msm tree

[Stephen Rothwell]

Hi Dave,

On Fri, 29 May 2020 14:10:56 +1000 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>
> On Tue, 26 May 2020 14:08:41 +1000 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
> >
> > On Tue, 19 May 2020 15:09:55 +1000 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:  
> > >
> > > After merging the drm-msm tree, today's linux-next build (arm
> > > multi_v7_defconfig) failed like this:
> > > 
> > > ERROR: modpost: "__aeabi_ldivmod" [drivers/gpu/drm/msm/msm.ko] undefined!
> > > ERROR: modpost: "__aeabi_uldivmod" [drivers/gpu/drm/msm/msm.ko] undefined!
> > > 
> > > Caused by commit
> > > 
> > >   04d9044f6c57 ("drm/msm/dpu: add support for clk and bw scaling for display")
> > > 
> > > I applied the following patch for today (this is mechanical, there may
> > > be a better way):
> > > 
> > > From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> > > Date: Tue, 19 May 2020 14:12:39 +1000
> > > Subject: [PATCH] drm/msm/dpu: fix up u64/u32 division for 32 bit architectures
> > > 
> > > Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> > > ---
> > >  drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 23 ++++++++++++++-----
> > >  drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c     | 15 ++++++++----
> > >  2 files changed, 28 insertions(+), 10 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> > > index 9697abcbec3f..85c2a4190840 100644
> > > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> > > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> > > @@ -10,6 +10,7 @@
> > >  #include <linux/sort.h>
> > >  #include <linux/clk.h>
> > >  #include <linux/bitmap.h>
> > > +#include <asm/div64.h>
> > >  
> > >  #include "dpu_kms.h"
> > >  #include "dpu_trace.h"
> > > @@ -53,8 +54,11 @@ static u64 _dpu_core_perf_calc_bw(struct dpu_kms *kms,
> > >  	}
> > >  
> > >  	bw_factor = kms->catalog->perf.bw_inefficiency_factor;
> > > -	if (bw_factor)
> > > -		crtc_plane_bw = mult_frac(crtc_plane_bw, bw_factor, 100);
> > > +	if (bw_factor) {
> > > +		u64 quot = crtc_plane_bw;
> > > +		u32 rem = do_div(quot, 100);
> > > +		crtc_plane_bw = (quot * bw_factor) + ((rem * bw_factor) / 100);
> > > +	}
> > >  
> > >  	return crtc_plane_bw;
> > >  }
> > > @@ -89,8 +93,11 @@ static u64 _dpu_core_perf_calc_clk(struct dpu_kms *kms,
> > >  	}
> > >  
> > >  	clk_factor = kms->catalog->perf.clk_inefficiency_factor;
> > > -	if (clk_factor)
> > > -		crtc_clk = mult_frac(crtc_clk, clk_factor, 100);
> > > +	if (clk_factor) {
> > > +		u64 quot = crtc_clk;
> > > +		u32 rem = do_div(quot, 100);
> > > +		crtc_clk = (quot * clk_factor) + ((rem * clk_factor) / 100);
> > > +	}
> > >  
> > >  	return crtc_clk;
> > >  }
> > > @@ -234,8 +241,12 @@ static int _dpu_core_perf_crtc_update_bus(struct dpu_kms *kms,
> > >  		}
> > >  	}
> > >  
> > > -	avg_bw = kms->num_paths ?
> > > -			perf.bw_ctl / kms->num_paths : 0;
> > > +	if (kms->num_paths) {
> > > +		avg_bw = perf.bw_ctl;
> > > +		do_div(avg_bw, kms->num_paths);
> > > +	} else {
> > > +		avg_bw = 0;
> > > +	}
> > >  
> > >  	for (i = 0; i < kms->num_paths; i++)
> > >  		icc_set_bw(kms->path[i],
> > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> > > index c2a6e3dacd68..ad95f32eac13 100644
> > > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> > > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> > > @@ -9,6 +9,7 @@
> > >  
> > >  #include <linux/debugfs.h>
> > >  #include <linux/dma-buf.h>
> > > +#include <asm/div64.h>
> > >  
> > >  #include <drm/drm_atomic_uapi.h>
> > >  #include <drm/drm_damage_helper.h>
> > > @@ -174,7 +175,11 @@ static void _dpu_plane_calc_bw(struct drm_plane *plane,
> > >  	plane_prefill_bw =
> > >  		src_width * hw_latency_lines * fps * fmt->bpp * scale_factor;
> > >  
> > > -	plane_prefill_bw = mult_frac(plane_prefill_bw, mode->vtotal, (vbp+vpw));
> > > +	{
> > > +		u64 quot = plane_prefill_bw;
> > > +		u32 rem = do_div(plane_prefill_bw, vbp + vpw);
> > > +		plane_prefill_bw = quot * mode->vtotal + rem * mode->vtotal / (vbp + vpw);
> > > +	}
> > >  
> > >  	pstate->plane_fetch_bw = max(plane_bw, plane_prefill_bw);
> > >  }
> > > @@ -204,9 +209,11 @@ static void _dpu_plane_calc_clk(struct drm_plane *plane)
> > >  	pstate->plane_clk =
> > >  		dst_width * mode->vtotal * fps;
> > >  
> > > -	if (src_height > dst_height)
> > > -		pstate->plane_clk = mult_frac(pstate->plane_clk,
> > > -					src_height, dst_height);
> > > +	if (src_height > dst_height) {
> > > +		u64 quot = pstate->plane_clk;
> > > +		u32 rem = do_div(quot, dst_height);
> > > +		pstate->plane_clk = quot * src_height + rem * src_height / dst_height;
> > > +	}
> > >  }
> > >  
> > >  /**
> > > -- 
> > > 2.26.2    
> > 
> > I am still applying the above ...  
> 
> Still applying.
> 
> Any comment even?

I assume that the drm-msm tree is merged via the drm tree, so just
letting you know that as far as I can tell the above build failure has
not yet been addressed.

[Another failure in the same commit (that I did not see) has been fixed]
-- 
Cheers,
Stephen Rothwell

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