[PATCH v3 10/15] lib: utils: fdt_fixup: Allow preserving PMU properties

[Yu-Chien Peter Lin]

Hi Anup,

On Sat, Nov 25, 2023 at 10:12:06AM +0530, Anup Patel wrote:
> On Wed, Nov 22, 2023 at 1:10 PM Yu Chien Peter Lin
> <peterlin at andestech.com> wrote:
> >
> > Add a scratch option to control PMU fixup, so the next
> > stage software can dump the PMU node including event
> > mapping information for debugging purposes.
> >
> > Signed-off-by: Yu Chien Peter Lin <peterlin at andestech.com>
> > Reviewed-by: Anup Patel <anup at brainfault.org>
> > ---
> > Changes v1 -> v2:
> >   - New patch
> > Changes v2 -> v3:
> >   - Rename to SBI_SCRATCH_PRESERVE_PMU_NODE (suggested by Anup)
> >   - Include Anup's RB tag
> > ---
> >  include/sbi/sbi_scratch.h | 2 ++
> >  lib/utils/fdt/fdt_fixup.c | 6 +++++-
> >  2 files changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/sbi/sbi_scratch.h b/include/sbi/sbi_scratch.h
> > index e6a33ba..0f67cde 100644
> > --- a/include/sbi/sbi_scratch.h
> > +++ b/include/sbi/sbi_scratch.h
> > @@ -151,6 +151,8 @@ enum sbi_scratch_options {
> >         SBI_SCRATCH_NO_BOOT_PRINTS = (1 << 0),
> >         /** Enable runtime debug prints */
> >         SBI_SCRATCH_DEBUG_PRINTS = (1 << 1),
> > +       /** Preserve PMU node properties */
> > +       SBI_SCRATCH_PRESERVE_PMU_NODE = (1 << 2),
> 
> I have second thoughts about using the scratch option for this.
> 
> Let's not waste a bit in the scratch option just for debugging the PMU node.
> 
> I suggest adding the kconfig option FDT_FIXUPS_PRESERVE_PMU_NODE
> in <opensbi>lib/utils/fdt/Kconfig and use it in fdt_fixups() function.

OK, will do.

Best regards,
Peter Lin

> Regards,
> Anup
> 
> >  };
> >
> >  /** Get pointer to sbi_scratch for current HART */
> > diff --git a/lib/utils/fdt/fdt_fixup.c b/lib/utils/fdt/fdt_fixup.c
> > index e213ded..cf20edf 100644
> > --- a/lib/utils/fdt/fdt_fixup.c
> > +++ b/lib/utils/fdt/fdt_fixup.c
> > @@ -387,6 +387,8 @@ int fdt_reserved_memory_fixup(void *fdt)
> >
> >  void fdt_fixups(void *fdt)
> >  {
> > +       struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
> > +
> >         fdt_aplic_fixup(fdt);
> >
> >         fdt_imsic_fixup(fdt);
> > @@ -394,5 +396,7 @@ void fdt_fixups(void *fdt)
> >         fdt_plic_fixup(fdt);
> >
> >         fdt_reserved_memory_fixup(fdt);
> > -       fdt_pmu_fixup(fdt);
> > +
> > +       if (!(scratch->options & SBI_SCRATCH_PRESERVE_PMU_NODE))
> > +               fdt_pmu_fixup(fdt);
> >  }
> > --
> > 2.34.1
> >