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[2001:1868:205::9]) by mx.google.com with ESMTPS id g19si26587251pgk.62.2016.11.24.01.59.27 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 24 Nov 2016 01:59:27 -0800 (PST) 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 1c9qnT-0004CD-Mb; Thu, 24 Nov 2016 09:58:27 +0000 Received: from mail-pg0-x22e.google.com ([2607:f8b0:400e:c05::22e]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1c9qnN-00042g-SF for linux-arm-kernel@lists.infradead.org; Thu, 24 Nov 2016 09:58:23 +0000 Received: by mail-pg0-x22e.google.com with SMTP id p66so17096571pga.2 for ; Thu, 24 Nov 2016 01:58:01 -0800 (PST) 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=Z1kR/nRvo86qsQxF0mT2XMxnV9IYTpTAJT8VrSMhpOo=; b=QXRG1oOMm+PWVfAyAxYiBcNUaA4fZM+gst0mmw+lPjbyOBECFCfSHvm7mxm8XYsPKp myEVN5GgVb94K/xUODYHew5PjsPc1wEupFAUVhyEiIdxSF0oB8tHv0eXwXNcxMCT778O 28/QdlPbj4tiufcMuTc0j1ZureMwaOheBbMIE= 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=Z1kR/nRvo86qsQxF0mT2XMxnV9IYTpTAJT8VrSMhpOo=; b=HTYVEbuzYoABPzmq7IcehhBVvq9KASjKucMY4d5JtArYdbzYUzxWYcEhH8IlAprLCS ueMpYJkpD0sV6K+ZQ7wA81F3wesYzQlPh1ou6dovyqQXgJ8gsGcmc5TMvYjq7IJoVrXH nd2SQzR3Yr2fXtoyoxsVYLexMOFN65NIgTbNvVXKiYLrvFgCugAVEDU9BvfPK1UfemYO 5Q1soySzZS/Xd7H7sUei5YAqz2Fpqs7RTRIfarTLL0pRRvkYWX5+o9UaLDjYvMKTTM/y O5Tp5vt91/X/HkSriRLjIewj0+6JmKOYD8eqLrXi8rBkZ4mJL3v7+SNzFYZ0w7hdHtv0 3vPg== X-Gm-Message-State: AKaTC000CkV1IowNuszXpClEW5jQr8qD4l3M9pwSGpfMzUz0kbbhM8gu9lXxVoM2my7Aj26T X-Received: by 10.84.167.2 with SMTP id c2mr3545588plb.56.1479981480907; Thu, 24 Nov 2016 01:58:00 -0800 (PST) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id a7sm58968774pfl.87.2016.11.24.01.57.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 24 Nov 2016 01:58:00 -0800 (PST) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, akpm@linux-foundation.org Subject: [PATCH v28 1/9] memblock: add memblock_cap_memory_range() Date: Thu, 24 Nov 2016 18:57:17 +0900 Message-Id: <20161124095717.7037-1-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20161124095523.6972-1-takahiro.akashi@linaro.org> References: <20161124095523.6972-1-takahiro.akashi@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161124_015822_021965_F42E63FA X-CRM114-Status: GOOD ( 14.79 ) 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 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [2607:f8b0:400e:c05:0:0:0:22e listed in] [list.dnswl.org] -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 memory range specified in the arguments. In addition, rework is done on memblock_mem_limit_remove_map() to re-implement it using memblock_cap_memory_range(). 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, or System RAM, on crash dump kernel. (Please note that "mem=" parameter is of little use for this purpose.) Signed-off-by: AKASHI Takahiro Reviewed-by: Will Deacon Cc: linux-mm@kvack.org Cc: Andrew Morton --- include/linux/memblock.h | 1 + mm/memblock.c | 44 +++++++++++++++++++++++++++++--------------- 2 files changed, 30 insertions(+), 15 deletions(-) -- 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..fbfcacc 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -333,6 +333,7 @@ phys_addr_t memblock_mem_size(unsigned long limit_pfn); 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_cap_memory_range(phys_addr_t base, phys_addr_t size); void memblock_mem_limit_remove_map(phys_addr_t limit); bool memblock_is_memory(phys_addr_t addr); int memblock_is_map_memory(phys_addr_t addr); diff --git a/mm/memblock.c b/mm/memblock.c index 7608bc3..fea1688 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1514,11 +1514,37 @@ void __init memblock_enforce_memory_limit(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); +} + void __init memblock_mem_limit_remove_map(phys_addr_t limit) { - struct memblock_type *type = &memblock.memory; phys_addr_t max_addr; - int i, ret, start_rgn, end_rgn; if (!limit) return; @@ -1529,19 +1555,7 @@ void __init memblock_mem_limit_remove_map(phys_addr_t limit) if (max_addr == (phys_addr_t)ULLONG_MAX) return; - ret = memblock_isolate_range(type, max_addr, (phys_addr_t)ULLONG_MAX, - &start_rgn, &end_rgn); - if (ret) - return; - - /* remove all the MAP regions above the limit */ - for (i = end_rgn - 1; i >= start_rgn; i--) { - if (!memblock_is_nomap(&type->regions[i])) - memblock_remove_region(type, i); - } - /* truncate the reserved regions */ - memblock_remove_range(&memblock.reserved, max_addr, - (phys_addr_t)ULLONG_MAX); + memblock_cap_memory_range(0, max_addr); } static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)