From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-x242.google.com (mail-qk0-x242.google.com [IPv6:2607:f8b0:400d:c09::242]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3x9CNX5Lj0zDqm7 for ; Sun, 16 Jul 2017 13:59:24 +1000 (AEST) Received: by mail-qk0-x242.google.com with SMTP id c18so6918551qkb.2 for ; Sat, 15 Jul 2017 20:59:24 -0700 (PDT) Sender: Ram Pai From: Ram Pai To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, dave.hansen@intel.com, hbabu@us.ibm.com, linuxram@us.ibm.com, arnd@arndb.de, akpm@linux-foundation.org, corbet@lwn.net, mingo@redhat.com, mhocko@kernel.org Subject: [RFC v6 33/62] powerpc: introduce get_pte_pkey() helper Date: Sat, 15 Jul 2017 20:56:35 -0700 Message-Id: <1500177424-13695-34-git-send-email-linuxram@us.ibm.com> In-Reply-To: <1500177424-13695-1-git-send-email-linuxram@us.ibm.com> References: <1500177424-13695-1-git-send-email-linuxram@us.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , get_pte_pkey() helper returns the pkey associated with a address corresponding to a given mm_struct. Signed-off-by: Ram Pai --- arch/powerpc/include/asm/book3s/64/mmu-hash.h | 5 +++++ arch/powerpc/mm/hash_utils_64.c | 25 +++++++++++++++++++++++++ 2 files changed, 30 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h index f7a6ed3..369f9ff 100644 --- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h +++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h @@ -450,6 +450,11 @@ extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap, int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid, pte_t *ptep, unsigned long trap, unsigned long flags, int ssize, unsigned int shift, unsigned int mmu_psize); + +#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS +u16 get_pte_pkey(struct mm_struct *mm, unsigned long address); +#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */ + #ifdef CONFIG_TRANSPARENT_HUGEPAGE extern int __hash_page_thp(unsigned long ea, unsigned long access, unsigned long vsid, pmd_t *pmdp, unsigned long trap, diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 1e74529..6bc8e91 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -1573,6 +1573,31 @@ void hash_preload(struct mm_struct *mm, unsigned long ea, local_irq_restore(flags); } +#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS +/* + * return the protection key associated with the given address + * and the mm_struct. + */ +u16 get_pte_pkey(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_or_hugepte(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_PPC64_MEMORY_PROTECTION_KEYS */ + #ifdef CONFIG_PPC_TRANSACTIONAL_MEM static inline void tm_flush_hash_page(int local) { -- 1.7.1