From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x243.google.com (mail-qt0-x243.google.com [IPv6:2607:f8b0:400d:c0d::243]) (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 3zQLDx2Xg6zF0XB for ; Tue, 23 Jan 2018 05:53:53 +1100 (AEDT) Received: by mail-qt0-x243.google.com with SMTP id d8so14864103qtm.0 for ; Mon, 22 Jan 2018 10:53:53 -0800 (PST) Sender: Ram Pai From: Ram Pai To: shuahkh@osg.samsung.com, linux-kselftest@vger.kernel.org Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, akpm@linux-foundation.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, arnd@arndb.de Subject: [PATCH v10 21/24] selftests/vm: sub-page allocator Date: Mon, 22 Jan 2018 10:52:14 -0800 Message-Id: <1516647137-11174-22-git-send-email-linuxram@us.ibm.com> In-Reply-To: <1516647137-11174-1-git-send-email-linuxram@us.ibm.com> References: <1516647137-11174-1-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: , introduce a new allocator that allocates 4k hardware-pages to back 64k linux-page. This allocator is only applicable on powerpc. Signed-off-by: Ram Pai --- tools/testing/selftests/vm/protection_keys.c | 30 ++++++++++++++++++++++++++ 1 files changed, 30 insertions(+), 0 deletions(-) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 5783587..ae71dad 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -766,6 +766,35 @@ void free_pkey_malloc(void *ptr) return ptr; } +void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey) +{ +#ifdef __powerpc64__ + void *ptr; + int ret; + + dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__, + size, prot, pkey); + pkey_assert(pkey < NR_PKEYS); + ptr = mmap(NULL, size, prot, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); + pkey_assert(ptr != (void *)-1); + + ret = syscall(__NR_subpage_prot, ptr, size, NULL); + if (ret) { + perror("subpage_perm"); + return PTR_ERR_ENOTSUP; + } + + ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey); + pkey_assert(!ret); + record_pkey_malloc(ptr, size); + + dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr); + return ptr; +#else /* __powerpc64__ */ + return PTR_ERR_ENOTSUP; +#endif /* __powerpc64__ */ +} + void *malloc_pkey_anon_huge(long size, int prot, u16 pkey) { int ret; @@ -888,6 +917,7 @@ void setup_hugetlbfs(void) void *(*pkey_malloc[])(long size, int prot, u16 pkey) = { malloc_pkey_with_mprotect, + malloc_pkey_with_mprotect_subpage, malloc_pkey_anon_huge, malloc_pkey_hugetlb /* can not do direct with the pkey_mprotect() API: -- 1.7.1