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Commit 087003e9 authored by Ram Pai's avatar Ram Pai Committed by Michael Ellerman
Browse files

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: default avatarRam Pai <linuxram@us.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent e6c2a479

arch/powerpc/include/asm/mmu.h

+9 −0
Original line number Diff line number Diff line
@@ -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.

arch/powerpc/mm/hash_utils_64.c

+24 −0
Original line number Diff line number Diff line
@@ -1581,6 +1581,30 @@ void hash_preload(struct mm_struct *mm, unsigned long ea, 
	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)

{