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[2001:1868:205::9]) by mx.google.com with ESMTPS id t90si537950pfi.85.2016.11.01.21.45.43 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Nov 2016 21:45:43 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) client-ip=2001:1868:205::9; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org; dmarc=fail (p=NONE dis=NONE) header.from=linaro.org Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1c1nPC-0002SA-VU; Wed, 02 Nov 2016 04:44:06 +0000 Received: from mail-pf0-x229.google.com ([2607:f8b0:400e:c00::229]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1c1nP8-0002Nw-C4 for linux-arm-kernel@lists.infradead.org; Wed, 02 Nov 2016 04:44:03 +0000 Received: by mail-pf0-x229.google.com with SMTP id i88so4213036pfk.2 for ; Tue, 01 Nov 2016 21:43:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=8qb6w8jCV+GdnJ99SgKPyAWfDsncXwaENgjZEwRosaY=; b=GLbqtKR6V77Xq3VxwUtL1qoL7S8dY9lVnd7vVIyx0MkD1iwdRmHmWMiXrbbmoKdSGT LaiUkLb/z0DuRokDDy2QYoXGhCBkmpqmCiBOotxcFcY1tDjv4I7ieOBYPTk/+srSK+nP 67SLaJDmuOPsobQkXdpDAaNNyziDyjQyQntOo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=8qb6w8jCV+GdnJ99SgKPyAWfDsncXwaENgjZEwRosaY=; b=SHJ7vJXuas/BixLlehqFwLEuxd41X0Od5p69Xyl8jobs4ZXWHT6uCkEyLLwMzuUNFz Tlz/ymLZKx90uDZNd62pV4cnUIWs6wX9YdWdw1NBYKvUhhqcynuZk/hgAOutwMmG9T7M dpMfw6nbvpEWRKcv7LOFMiL7awomoaPt1/JKgAcHHjkEo+rbaJawm34kYA01rhF5/xx6 FlbxgTQ7XoPjbzn8Mo8Oghukbs66HyjNaUZ2Y/FF5ctENi4X+G5Gc4/Q+II4akSVflMN Qxpy4Fw3ye+iBiWjCilcIUmg8jqfFPu68inuf6CrpUMIVQTtWicMCz8c13YB0o3uc1AO 716A== X-Gm-Message-State: ABUngvex/KNMxs2lxlEEr8UlCNheO1Kenqa1V5jd04lvtpNENx22E7onpaayB27tRDfHub8u X-Received: by 10.99.144.65 with SMTP id a62mr2662827pge.103.1478061826796; Tue, 01 Nov 2016 21:43:46 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id r74sm512113pfj.11.2016.11.01.21.43.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Nov 2016 21:43:46 -0700 (PDT) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, akpm@linux-foundation.org Subject: [PATCH v27 1/9] memblock: add memblock_cap_memory_range() Date: Wed, 2 Nov 2016 13:51:53 +0900 Message-Id: <20161102045153.12008-1-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20161102044959.11954-1-takahiro.akashi@linaro.org> References: <20161102044959.11954-1-takahiro.akashi@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161101_214402_574457_232C8DA6 X-CRM114-Status: GOOD ( 12.92 ) X-Spam-Score: -2.0 (--) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-2.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, AKASHI Takahiro , geoff@infradead.org, kexec@lists.infradead.org, linux-mm@kvack.org, james.morse@arm.com, bauerman@linux.vnet.ibm.com, dyoung@redhat.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Add memblock_cap_memory_range() which will remove all the memblock regions except the range specified in the arguments. This function, like memblock_mem_limit_remove_map(), will not remove memblocks with MEMMAP_NOMAP attribute as they may be mapped and accessed later as "device memory." See the commit a571d4eb55d8 ("mm/memblock.c: add new infrastructure to address the mem limit issue"). This function is used, in a succeeding patch in the series of arm64 kdump suuport, to limit the range of usable memory, System RAM, on crash dump kernel. (Please note that "mem=" parameter is of little use for this purpose.) Signed-off-by: AKASHI Takahiro Cc: linux-mm@kvack.org Cc: Andrew Morton --- include/linux/memblock.h | 1 + mm/memblock.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 29 insertions(+) -- 2.10.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 5b759c9..0e770af 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -334,6 +334,7 @@ phys_addr_t memblock_start_of_DRAM(void); phys_addr_t memblock_end_of_DRAM(void); void memblock_enforce_memory_limit(phys_addr_t memory_limit); void memblock_mem_limit_remove_map(phys_addr_t limit); +void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size); bool memblock_is_memory(phys_addr_t addr); int memblock_is_map_memory(phys_addr_t addr); int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); diff --git a/mm/memblock.c b/mm/memblock.c index 7608bc3..eb53876 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1544,6 +1544,34 @@ void __init memblock_mem_limit_remove_map(phys_addr_t limit) (phys_addr_t)ULLONG_MAX); } +void __init memblock_cap_memory_range(phys_addr_t base, phys_addr_t size) +{ + int start_rgn, end_rgn; + int i, ret; + + if (!size) + return; + + ret = memblock_isolate_range(&memblock.memory, base, size, + &start_rgn, &end_rgn); + if (ret) + return; + + /* remove all the MAP regions */ + for (i = memblock.memory.cnt - 1; i >= end_rgn; i--) + if (!memblock_is_nomap(&memblock.memory.regions[i])) + memblock_remove_region(&memblock.memory, i); + + for (i = start_rgn - 1; i >= 0; i--) + if (!memblock_is_nomap(&memblock.memory.regions[i])) + memblock_remove_region(&memblock.memory, i); + + /* truncate the reserved regions */ + memblock_remove_range(&memblock.reserved, 0, base); + memblock_remove_range(&memblock.reserved, + base + size, (phys_addr_t)ULLONG_MAX); +} + static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr) { unsigned int left = 0, right = type->cnt;