[PATCH v3 16/18] powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU
Christophe Leroy
christophe.leroy at csgroup.eu
Fri Oct 22 18:18:09 AEDT 2021
Le 22/10/2021 à 00:30, Nicholas Piggin a écrit :
> Compiling out hash support code when CONFIG_PPC_64S_HASH_MMU=n saves
> 128kB kernel image size (90kB text) on powernv_defconfig minus KVM,
> 350kB on pseries_defconfig minus KVM, 40kB on a tiny config.
>
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
> ---
> arch/powerpc/Kconfig | 2 +-
> arch/powerpc/include/asm/book3s/64/mmu.h | 19 +++++++++--
> .../include/asm/book3s/64/tlbflush-hash.h | 7 ++++
> arch/powerpc/include/asm/book3s/pgtable.h | 4 +++
> arch/powerpc/include/asm/mmu_context.h | 2 ++
> arch/powerpc/include/asm/paca.h | 8 +++++
> arch/powerpc/kernel/asm-offsets.c | 2 ++
> arch/powerpc/kernel/entry_64.S | 4 +--
> arch/powerpc/kernel/exceptions-64s.S | 16 +++++++++
> arch/powerpc/kernel/mce.c | 2 +-
> arch/powerpc/kernel/mce_power.c | 10 ++++--
> arch/powerpc/kernel/paca.c | 18 ++++------
> arch/powerpc/kernel/process.c | 13 +++----
> arch/powerpc/kernel/prom.c | 2 ++
> arch/powerpc/kernel/setup_64.c | 5 +++
> arch/powerpc/kexec/core_64.c | 4 +--
> arch/powerpc/kexec/ranges.c | 4 +++
> arch/powerpc/mm/book3s64/Makefile | 15 ++++----
> arch/powerpc/mm/book3s64/hugetlbpage.c | 2 ++
> arch/powerpc/mm/book3s64/mmu_context.c | 34 +++++++++++++++----
> arch/powerpc/mm/book3s64/pgtable.c | 2 +-
> arch/powerpc/mm/book3s64/radix_pgtable.c | 4 +++
> arch/powerpc/mm/copro_fault.c | 2 ++
> arch/powerpc/mm/ptdump/Makefile | 2 +-
> arch/powerpc/platforms/powernv/idle.c | 2 ++
> arch/powerpc/platforms/powernv/setup.c | 2 ++
> arch/powerpc/platforms/pseries/lpar.c | 11 ++++--
> arch/powerpc/platforms/pseries/lparcfg.c | 2 +-
> arch/powerpc/platforms/pseries/mobility.c | 6 ++++
> arch/powerpc/platforms/pseries/ras.c | 2 ++
> arch/powerpc/platforms/pseries/reconfig.c | 2 ++
> arch/powerpc/platforms/pseries/setup.c | 6 ++--
> arch/powerpc/xmon/xmon.c | 8 +++--
> drivers/misc/lkdtm/Makefile | 2 +-
> drivers/misc/lkdtm/core.c | 2 +-
> 35 files changed, 177 insertions(+), 51 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/book3s/64/mmu.h b/arch/powerpc/include/asm/book3s/64/mmu.h
> index c02f42d1031e..d94ebae386b6 100644
> --- a/arch/powerpc/include/asm/book3s/64/mmu.h
> +++ b/arch/powerpc/include/asm/book3s/64/mmu.h
> @@ -233,7 +245,8 @@ static inline void setup_initial_memory_limit(phys_addr_t first_memblock_base,
> * know which translations we will pick. Hence go with hash
> * restrictions.
> */
> - return hash__setup_initial_memory_limit(first_memblock_base,
> + if (!radix_enabled())
> + return hash__setup_initial_memory_limit(first_memblock_base,
> first_memblock_size);
It is a void function, using return is not correct.
> }
>
> @@ -255,6 +268,7 @@ static inline void radix_init_pseries(void) { }
> void cleanup_cpu_mmu_context(void);
> #endif
>
> +#ifdef CONFIG_PPC_64S_HASH_MMU
> static inline int get_user_context(mm_context_t *ctx, unsigned long ea)
> {
> int index = ea >> MAX_EA_BITS_PER_CONTEXT;
> @@ -274,6 +288,7 @@ static inline unsigned long get_user_vsid(mm_context_t *ctx,
>
> return get_vsid(context, ea, ssize);
> }
> +#endif
>
> #endif /* __ASSEMBLY__ */
> #endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */
> diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
> index 3b95769739c7..06f4bd09eecf 100644
> --- a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
> +++ b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
> @@ -112,8 +112,15 @@ static inline void hash__flush_tlb_kernel_range(unsigned long start,
>
> struct mmu_gather;
> extern void hash__tlb_flush(struct mmu_gather *tlb);
> +extern void flush_tlb_pmd_range(struct mm_struct *mm, pmd_t *pmd,
> + unsigned long addr);
'extern' is superflous
> +
> +#ifdef CONFIG_PPC_64S_HASH_MMU
> /* Private function for use by PCI IO mapping code */
> extern void __flush_hash_table_range(unsigned long start, unsigned long end);
> extern void flush_tlb_pmd_range(struct mm_struct *mm, pmd_t *pmd,
> unsigned long addr);
> +#else
> +static inline void __flush_hash_table_range(unsigned long start, unsigned long end) { }
> +#endif
> #endif /* _ASM_POWERPC_BOOK3S_64_TLBFLUSH_HASH_H */
> diff --git a/arch/powerpc/mm/book3s64/mmu_context.c b/arch/powerpc/mm/book3s64/mmu_context.c
> index c10fc8a72fb3..ae8d6c91dcd9 100644
> --- a/arch/powerpc/mm/book3s64/mmu_context.c
> +++ b/arch/powerpc/mm/book3s64/mmu_context.c
> @@ -31,6 +31,7 @@ static int alloc_context_id(int min_id, int max_id)
> return ida_alloc_range(&mmu_context_ida, min_id, max_id, GFP_KERNEL);
> }
>
> +#ifdef CONFIG_PPC_64S_HASH_MMU
> void hash__reserve_context_id(int id)
> {
> int result = ida_alloc_range(&mmu_context_ida, id, id, GFP_KERNEL);
> @@ -50,7 +51,9 @@ int hash__alloc_context_id(void)
> return alloc_context_id(MIN_USER_CONTEXT, max);
> }
> EXPORT_SYMBOL_GPL(hash__alloc_context_id);
> +#endif
>
> +#ifdef CONFIG_PPC_64S_HASH_MMU
> static int realloc_context_ids(mm_context_t *ctx)
> {
> int i, id;
> @@ -144,12 +147,21 @@ static int hash__init_new_context(struct mm_struct *mm)
> return index;
> }
>
> +void slb_setup_new_exec(void);
Include arch/powerpc/mm/book3s64/internal.h instead
> +
> void hash__setup_new_exec(void)
> {
> slice_setup_new_exec();
>
> slb_setup_new_exec();
> }
> +#else
> +static inline int hash__init_new_context(struct mm_struct *mm)
> +{
> + BUILD_BUG();
> + return 0;
> +}
> +#endif
>
> static int radix__init_new_context(struct mm_struct *mm)
> {
> diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
> index 7d556b5513e4..57d2d797c4f6 100644
> --- a/arch/powerpc/mm/book3s64/pgtable.c
> +++ b/arch/powerpc/mm/book3s64/pgtable.c
> @@ -535,7 +535,7 @@ static int __init pgtable_debugfs_setup(void)
> }
> arch_initcall(pgtable_debugfs_setup);
>
> -#ifdef CONFIG_ZONE_DEVICE
> +#if defined(CONFIG_ZONE_DEVICE) && defined(ARCH_HAS_MEMREMAP_COMPAT_ALIGN)
Patch 12 does
select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_BOOK3S_64
So this change is not needed
> /*
> * Override the generic version in mm/memremap.c.
> *
> diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
> index dd8241c009e5..30f764476c30 100644
> --- a/arch/powerpc/xmon/xmon.c
> +++ b/arch/powerpc/xmon/xmon.c
> @@ -1160,9 +1160,11 @@ cmds(struct pt_regs *excp)
> show_tasks();
> break;
> #ifdef CONFIG_PPC_BOOK3S
> +#if defined(CONFIG_PPC32) || defined(CONFIG_PPC_64S_HASH_MMU)
I think you'll get a build failure here.
dump_segments() is defined only with CONFIG_PPC_BOOK3S_64 and
CONFIG_PPC_BOOK3S_32, see
https://elixir.bootlin.com/linux/v5.15-rc5/source/arch/powerpc/xmon/xmon.c#L3745
and
https://elixir.bootlin.com/linux/v5.15-rc5/source/arch/powerpc/xmon/xmon.c#L3784
> case 'u':
> dump_segments();
> break;
> +#endif
> #elif defined(CONFIG_44x)
> case 'u':
> dump_tlb_44x();
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