From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: ACJfBovilehY7w9GZFRTGdbTLO/s11qvBWW+2F+eqEWyA8+2KJv1WAC9plptpj5R+Iw5QFWnH+Uj ARC-Seal: i=1; a=rsa-sha256; t=1516326773; cv=none; d=google.com; s=arc-20160816; b=ZUBJeNjNDE6W/di6B0jhmnou8AV5By5B8B6VZs4lpNrkETuXX+hL18B2FAw6eiucw/ sGPk/gRoOyDx9edWm6V2pbJDH9vx8gFdhlbZnE7lvCMZGXDKxhfIc9agk5Py9NxBzFT+ J3uaJOZ3L24CWzrvesz6gHyjgGe8JW3uOa8pb7nPWkw2JDci/2CgY9k34/6h3RMc0/Ef lEQ81rRA0whPkG1jzdXwEhLvXjAGLT1O/8gYoQYY31hR7d8Qs/6GP567/4RQ66HUkR8C b3XylSFpsmSl2sg8Rxipaqu20hs2m+cTbKIRGBfyQ+o1Xd+Sb+TeK4sO9p/oKq9QfBU+ JjyA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=+88eGrQnAsPLQA6qqtp7bdCN9u2qpNyMzf0KIcbP6Mg=; b=L7XIK835v41NGfKcge0lRVTC7qKKTQXxYid/kqK6tQgj36E5IG2JrUb/J5qFQJdTpp HJfEznpsCukuLZ+Lz00kC6yrvRe2w1EfXk+V4+gxTxiPAfe2wBFMx+c/X5fOuZfWMlNW Am8/n2THcaFIITQmr9wZ0dzi3ZpVsXu2VTgBFR40yb+dPKuGnWSi7w0a12gHTK4ZCVeb I/TemLzDcpGA+u30izBHwxkIe+AD/FyHVR74SFh+Q9YYu9EM/NXFknBRbS09Nr3NRP3I URMhsAQMvS4zBCpFE9Ae/kt4HJtd2LkR/M6HjquTAzGW7EFDYNlec5B9H0SciJUyA/os JfHQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=neutral (body hash did not verify) header.i=@gmail.com header.s=20161025 header.b=YNDTexF/; spf=pass (google.com: best guess record for domain of linux-kselftest-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kselftest-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=ibm.com Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@gmail.com header.s=20161025 header.b=YNDTexF/; spf=pass (google.com: best guess record for domain of linux-kselftest-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kselftest-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=ibm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755232AbeASBww (ORCPT ); Thu, 18 Jan 2018 20:52:52 -0500 Received: from mail-qt0-f193.google.com ([209.85.216.193]:37921 "EHLO mail-qt0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755754AbeASBwl (ORCPT ); Thu, 18 Jan 2018 20:52:41 -0500 From: Ram Pai To: mpe@ellerman.id.au, mingo@redhat.com, akpm@linux-foundation.org, corbet@lwn.net, arnd@arndb.de Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, dave.hansen@intel.com, benh@kernel.crashing.org, paulus@samba.org, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, hbabu@us.ibm.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com, ebiederm@xmission.com, linuxram@us.ibm.com Subject: [PATCH v10 20/27] powerpc: introduce get_mm_addr_key() helper Date: Thu, 18 Jan 2018 17:50:41 -0800 Message-Id: <1516326648-22775-21-git-send-email-linuxram@us.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1516326648-22775-1-git-send-email-linuxram@us.ibm.com> References: <1516326648-22775-1-git-send-email-linuxram@us.ibm.com> Sender: linux-kselftest-owner@vger.kernel.org X-Mailing-List: linux-kselftest@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1589983863107507574?= X-GMAIL-MSGID: =?utf-8?q?1589983863107507574?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: get_mm_addr_key() helper returns the pkey associated with an address corresponding to a given mm_struct. Signed-off-by: Ram Pai --- arch/powerpc/include/asm/mmu.h | 9 +++++++++ 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 6364f5c..bb38312 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 dc0f76e..1e1c03b 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -1573,6 +1573,30 @@ 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) { -- 1.7.1