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Thu, 7 May 2020 00:44:19 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 30us7p2p25-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 May 2020 00:44:19 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0470iGkU026090; Thu, 7 May 2020 00:44:16 GMT Received: from ayz-linux.localdomain (/68.7.158.207) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 06 May 2020 17:44:16 -0700 From: Anthony Yznaga To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: willy@infradead.org, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, rppt@linux.ibm.com, akpm@linux-foundation.org, hughd@google.com, ebiederm@xmission.com, masahiroy@kernel.org, ardb@kernel.org, ndesaulniers@google.com, dima@golovin.in, daniel.kiper@oracle.com, nivedita@alum.mit.edu, rafael.j.wysocki@intel.com, dan.j.williams@intel.com, zhenzhong.duan@oracle.com, jroedel@suse.de, bhe@redhat.com, guro@fb.com, Thomas.Lendacky@amd.com, andriy.shevchenko@linux.intel.com, keescook@chromium.org, hannes@cmpxchg.org, minchan@kernel.org, mhocko@kernel.org, ying.huang@intel.com, yang.shi@linux.alibaba.com, gustavo@embeddedor.com, ziqian.lzq@antfin.com, vdavydov.dev@gmail.com, jason.zeng@intel.com, kevin.tian@intel.com, zhiyuan.lv@intel.com, lei.l.li@intel.com, paul.c.lai@intel.com, ashok.raj@intel.com, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, kexec@lists.infradead.org Subject: [RFC 29/43] memblock: PKRAM: mark memblocks that contain preserved pages Date: Wed, 6 May 2020 17:41:55 -0700 Message-Id: <1588812129-8596-30-git-send-email-anthony.yznaga@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com> References: <1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9613 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 adultscore=0 suspectscore=2 mlxlogscore=999 malwarescore=0 phishscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070001 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9613 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 clxscore=1015 suspectscore=2 priorityscore=1501 malwarescore=0 mlxlogscore=999 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070001 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: To support deferred initialization of page structs for preserved pages, separate memblocks containing preserved pages by setting a new flag when adding them to the memblock reserved list. Signed-off-by: Anthony Yznaga --- include/linux/memblock.h | 7 +++++++ mm/memblock.c | 8 +++++++- mm/pkram.c | 4 ++-- 3 files changed, 16 insertions(+), 3 deletions(-) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 6bc37a731d27..27ab2b30ae1d 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -37,6 +37,7 @@ enum memblock_flags { MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */ MEMBLOCK_MIRROR = 0x2, /* mirrored region */ MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */ + MEMBLOCK_PRESERVED = 0x8, /* preserved pages region */ }; /** @@ -111,6 +112,7 @@ void memblock_allow_resize(void); int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); int memblock_add(phys_addr_t base, phys_addr_t size); int memblock_remove(phys_addr_t base, phys_addr_t size); +int __memblock_reserve(phys_addr_t base, phys_addr_t size, enum memblock_flags flags); int memblock_free(phys_addr_t base, phys_addr_t size); int memblock_reserve(phys_addr_t base, phys_addr_t size); #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP @@ -215,6 +217,11 @@ static inline bool memblock_is_nomap(struct memblock_region *m) return m->flags & MEMBLOCK_NOMAP; } +static inline bool memblock_is_preserved(struct memblock_region *m) +{ + return m->flags & MEMBLOCK_PRESERVED; +} + #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, unsigned long *end_pfn); diff --git a/mm/memblock.c b/mm/memblock.c index 69ae883b8d21..1a9a2055ed11 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -831,6 +831,12 @@ int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size) return memblock_remove_range(&memblock.reserved, base, size); } +int __init_memblock __memblock_reserve(phys_addr_t base, phys_addr_t size, + enum memblock_flags flags) +{ + return memblock_add_range(&memblock.reserved, base, size, MAX_NUMNODES, flags); +} + int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size) { phys_addr_t end = base + size - 1; @@ -838,7 +844,7 @@ int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size) memblock_dbg("%s: [%pa-%pa] %pS\n", __func__, &base, &end, (void *)_RET_IP_); - return memblock_add_range(&memblock.reserved, base, size, MAX_NUMNODES, 0); + return __memblock_reserve(base, size, 0); } #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP diff --git a/mm/pkram.c b/mm/pkram.c index 97a7dd0a5b7d..b83d31740619 100644 --- a/mm/pkram.c +++ b/mm/pkram.c @@ -170,7 +170,7 @@ static int __init pkram_reserve_page(unsigned long pfn) size = PAGE_SIZE; if (memblock_is_region_reserved(base, size) || - memblock_reserve(base, size) < 0) + __memblock_reserve(base, size, MEMBLOCK_PRESERVED) < 0) err = -EBUSY; if (!err) @@ -1446,7 +1446,7 @@ static void pkram_remove_identity_map(struct page *page) static int __init pkram_reserve_range_cb(struct pkram_pg_state *st, unsigned long base, unsigned long size) { if (memblock_is_region_reserved(base, size) || - memblock_reserve(base, size) < 0) { + __memblock_reserve(base, size, MEMBLOCK_PRESERVED) < 0) { pr_warn("PKRAM: reservations exist in [0x%lx,0x%lx]\n", base, base + size - 1); /* * Set a lower bound so another walk can undo the earlier,