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powerpc/64s/hash: provide arch_setup_exec hooks for hash slice setup

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This will be used by the SLB code in the next patch, but for now this
sets the slb_addr_limit to the correct size for 32-bit tasks.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2018-09-15 01:30:55 +10:00 committed by Michael Ellerman
parent e83cbf7fb7
commit 2e1626744e
6 changed files with 37 additions and 0 deletions
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2
arch/powerpc/include/asm/book3s/64/mmu-hash.h
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@ -487,6 +487,8 @@ int htab_remove_mapping(unsigned long vstart, unsigned long vend,
extern void pseries_add_gpage(u64 addr, u64 page_size, unsigned long number_of_pages);
extern void demote_segment_4k(struct mm_struct *mm, unsigned long addr);
extern void hash__setup_new_exec(void);
#ifdef CONFIG_PPC_PSERIES
void hpte_init_pseries(void);
#else

1
arch/powerpc/include/asm/slice.h
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@ -32,6 +32,7 @@ void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
unsigned long len, unsigned int psize);
void slice_init_new_context_exec(struct mm_struct *mm);
void slice_setup_new_exec(void);
#endif /* __ASSEMBLY__ */

6
arch/powerpc/include/asm/thread_info.h
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@ -72,6 +72,12 @@ static inline struct thread_info *current_thread_info(void)
}
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
#ifdef CONFIG_PPC_BOOK3S_64
void arch_setup_new_exec(void);
#define arch_setup_new_exec arch_setup_new_exec
#endif
#endif /* __ASSEMBLY__ */
/*

9
arch/powerpc/kernel/process.c
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@ -1482,6 +1482,15 @@ void flush_thread(void)
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
}
#ifdef CONFIG_PPC_BOOK3S_64
void arch_setup_new_exec(void)
{
if (radix_enabled())
return;
hash__setup_new_exec();
}
#endif
int set_thread_uses_vas(void)
{
#ifdef CONFIG_PPC_BOOK3S_64

5
arch/powerpc/mm/mmu_context_book3s64.c
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@ -84,6 +84,11 @@ static int hash__init_new_context(struct mm_struct *mm)
return index;
}
void hash__setup_new_exec(void)
{
slice_setup_new_exec();
}
static int radix__init_new_context(struct mm_struct *mm)
{
unsigned long rts_field;

14
arch/powerpc/mm/slice.c
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@ -746,6 +746,20 @@ void slice_init_new_context_exec(struct mm_struct *mm)
bitmap_fill(mask->high_slices, SLICE_NUM_HIGH);
}
#ifdef CONFIG_PPC_BOOK3S_64
void slice_setup_new_exec(void)
{
struct mm_struct *mm = current->mm;
slice_dbg("slice_setup_new_exec(mm=%p)\n", mm);
if (!is_32bit_task())
return;
mm->context.slb_addr_limit = DEFAULT_MAP_WINDOW;
}
#endif
void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
unsigned long len, unsigned int psize)
{