[PATCH v1 1/6] meminfo: add memory details for armv8

[Ilias Apalodimas]

On Wed, 5 Feb 2025 at 11:27, Jerome Forissier
<jerome.forissier at linaro.org> wrote:
>
>
>
> On 2/5/25 08:16, Ilias Apalodimas wrote:
> > Upcoming patches are mapping memory with RO, RW^X etc permsissions.
> > Fix the meminfo command to display them properly
> >
> > Acked-by: Jerome Forissier <jerome.forissier at linaro.org>
> > Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
> > ---
> >  arch/arm/cpu/armv8/cache_v8.c    | 26 +++++++++++++++++++++++---
> >  arch/arm/include/asm/armv8/mmu.h |  2 ++
> >  cmd/meminfo.c                    |  5 +++++
> >  3 files changed, 30 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
> > index 5d6953ffedd1..c4b3da4a8da7 100644
> > --- a/arch/arm/cpu/armv8/cache_v8.c
> > +++ b/arch/arm/cpu/armv8/cache_v8.c
> > @@ -421,7 +421,7 @@ static int count_ranges(void)
> >       return count;
> >  }
> >
> > -#define ALL_ATTRS (3 << 8 | PMD_ATTRINDX_MASK)
> > +#define ALL_ATTRS (3 << 8 | PMD_ATTRMASK)
> >  #define PTE_IS_TABLE(pte, level) (pte_type(&(pte)) == PTE_TYPE_TABLE && (level) < 3)
> >
> >  enum walker_state {
> > @@ -568,6 +568,20 @@ static void pretty_print_table_attrs(u64 pte)
> >  static void pretty_print_block_attrs(u64 pte)
> >  {
> >       u64 attrs = pte & PMD_ATTRINDX_MASK;
> > +     u64 perm_attrs = pte & PMD_ATTRMASK;
> > +     char mem_attrs[16] = { 0 };
>
> 11 is enough is seems?

I can but OTOH, I prefer defining the arrays aligned. I dont think
anyone will miss 5 bytes!

Cheers
/Ilias
>
> > +     int cnt = 0;
> > +
> > +     if (perm_attrs & PTE_BLOCK_PXN)
> > +             cnt += snprintf(mem_attrs + cnt, sizeof(mem_attrs) - cnt, "PXN ");
> > +     if (perm_attrs & PTE_BLOCK_UXN)
> > +             cnt += snprintf(mem_attrs + cnt, sizeof(mem_attrs) - cnt, "UXN ");
> > +     if (perm_attrs & PTE_BLOCK_RO)
> > +             cnt += snprintf(mem_attrs + cnt, sizeof(mem_attrs) - cnt, "RO");
> > +     if (!mem_attrs[0])
> > +             snprintf(mem_attrs, sizeof(mem_attrs), "RWX ");
> > +
> > +     printf(" | %-10s", mem_attrs);
> >
> >       switch (attrs) {
> >       case PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE):
> > @@ -613,6 +627,7 @@ static void print_pte(u64 pte, int level)
> >  {
> >       if (PTE_IS_TABLE(pte, level)) {
> >               printf(" %-5s", "Table");
> > +             printf(" %-12s", "|");
> >               pretty_print_table_attrs(pte);
> >       } else {
> >               pretty_print_pte_type(pte);
> > @@ -642,9 +657,9 @@ static bool pagetable_print_entry(u64 start_attrs, u64 end, int va_bits, int lev
> >
> >       printf("%*s", indent * 2, "");
> >       if (PTE_IS_TABLE(start_attrs, level))
> > -             printf("[%#011llx]%14s", _addr, "");
> > +             printf("[%#016llx]%19s", _addr, "");
> >       else
> > -             printf("[%#011llx - %#011llx]", _addr, end);
> > +             printf("[%#016llx - %#016llx]", _addr, end);
> >
> >       printf("%*s | ", (3 - level) * 2, "");
> >       print_pte(start_attrs, level);
> > @@ -1112,3 +1127,8 @@ void __weak enable_caches(void)
> >       icache_enable();
> >       dcache_enable();
> >  }
> > +
> > +void arch_dump_mem_attrs(void)
> > +{
> > +     dump_pagetable(gd->arch.tlb_addr, get_tcr(NULL, NULL));
> > +}
> > diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h
> > index 0ab681c893d3..6af8cd111a44 100644
> > --- a/arch/arm/include/asm/armv8/mmu.h
> > +++ b/arch/arm/include/asm/armv8/mmu.h
> > @@ -66,6 +66,7 @@
> >  #define PTE_BLOCK_NG         (1 << 11)
> >  #define PTE_BLOCK_PXN                (UL(1) << 53)
> >  #define PTE_BLOCK_UXN                (UL(1) << 54)
> > +#define PTE_BLOCK_RO            (UL(1) << 7)
> >
> >  /*
> >   * AttrIndx[2:0]
> > @@ -75,6 +76,7 @@
> >  #define PMD_ATTRMASK         (PTE_BLOCK_PXN          | \
> >                                PTE_BLOCK_UXN          | \
> >                                PMD_ATTRINDX_MASK      | \
> > +                              PTE_BLOCK_RO           | \
> >                                PTE_TYPE_VALID)
> >
> >  /*
> > diff --git a/cmd/meminfo.c b/cmd/meminfo.c
> > index 5e83d61c2dd3..3915e2bbb268 100644
> > --- a/cmd/meminfo.c
> > +++ b/cmd/meminfo.c
> > @@ -15,6 +15,10 @@
> >
> >  DECLARE_GLOBAL_DATA_PTR;
> >
> > +void __weak arch_dump_mem_attrs(void)
> > +{
> > +}
> > +
> >  static void print_region(const char *name, ulong base, ulong size, ulong *uptop)
> >  {
> >       ulong end = base + size;
> > @@ -54,6 +58,7 @@ static int do_meminfo(struct cmd_tbl *cmdtp, int flag, int argc,
> >
> >       puts("DRAM:  ");
> >       print_size(gd->ram_size, "\n");
> > +     arch_dump_mem_attrs();
> >
> >       if (!IS_ENABLED(CONFIG_CMD_MEMINFO_MAP))
> >               return 0;