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powerpc: introduce get_mm_addr_key() helper 

get_mm_addr_key() helper returns the pkey associated with
an address corresponding to a given mm_struct.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ram Pai 2018-01-18 17:50:41 -08:00 committed by Michael Ellerman
parent e6c2a4797e
commit 087003e9ef
2 changed files with 33 additions and 0 deletions
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9
arch/powerpc/include/asm/mmu.h
View File

@ -260,6 +260,15 @@ static inline bool early_radix_enabled(void)
}
#endif
#ifdef CONFIG_PPC_MEM_KEYS
extern u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address);
#else
static inline u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address)
{
return 0;
}
#endif /* CONFIG_PPC_MEM_KEYS */
#endif /* !__ASSEMBLY__ */
/* The kernel use the constants below to index in the page sizes array.

24
arch/powerpc/mm/hash_utils_64.c
View File

@ -1581,6 +1581,30 @@ out_exit:
local_irq_restore(flags);
}
#ifdef CONFIG_PPC_MEM_KEYS
/*
* Return the protection key associated with the given address and the
* mm_struct.
*/
u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address)
{
pte_t *ptep;
u16 pkey = 0;
unsigned long flags;
if (!mm || !mm->pgd)
return 0;
local_irq_save(flags);
ptep = find_linux_pte(mm->pgd, address, NULL, NULL);
if (ptep)
pkey = pte_to_pkey_bits(pte_val(READ_ONCE(*ptep)));
local_irq_restore(flags);
return pkey;
}
#endif /* CONFIG_PPC_MEM_KEYS */
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
static inline void tm_flush_hash_page(int local)
{