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author | Ram Pai <linuxram@us.ibm.com> | 2018-01-18 17:50:41 -0800 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-20 22:59:05 +1100 |
commit | 087003e9ef7c1c5bec932387e47511429eff2a54 (patch) | |
tree | fcd8cdc6a20be99816dcf9741b26215c1a69f27d /arch | |
parent | e6c2a4797e101a25eced94aa9e1fc42c30247aec (diff) | |
download | linux-stable-087003e9ef7c1c5bec932387e47511429eff2a54.tar.gz linux-stable-087003e9ef7c1c5bec932387e47511429eff2a54.tar.bz2 linux-stable-087003e9ef7c1c5bec932387e47511429eff2a54.zip |
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>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/powerpc/include/asm/mmu.h | 9 | ||||
-rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 24 |
2 files changed, 33 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h index 6364f5c2cc3e..bb38312cff28 100644 --- a/arch/powerpc/include/asm/mmu.h +++ b/arch/powerpc/include/asm/mmu.h @@ -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. diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index a78e24cf93ff..462c34e7b01d 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -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) { |