From patchwork Mon Jun 6 17:01:03 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russell King X-Patchwork-Id: 9158893 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 76C4160572 for ; Mon, 6 Jun 2016 17:12:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6588C27B13 for ; Mon, 6 Jun 2016 17:12:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 59F742834C; Mon, 6 Jun 2016 17:12:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BC93C27B13 for ; Mon, 6 Jun 2016 17:12:55 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1b9y3X-00089I-9v; Mon, 06 Jun 2016 17:11:15 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:3201:214:fdff:fe10:1be6]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1b9y2u-0005p1-3x for linux-arm-kernel@lists.infradead.org; Mon, 06 Jun 2016 17:10:37 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2014; h=Date:Sender:Message-Id:Content-Type:Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References:In-Reply-To; bh=3QNDb9i5anw5Mk2MIxarnCqtarS7zGJh1yZJkYx9EKA=; b=nz5zGARevQsdazVUGUwEu1PVOsvEpei0VYIcW97dAvzfgZElNFkR+Sfryl4K90N7jNKFvbyKcUZ4cs7XkFaxhICnUlUI5p2/YaTQrXRvSkPk7o0nKil3dwOob8CJELJbgMyaEvscg2j2igq24+Jso46Dcc3tBGBNh7Z3rAUVX7E=; Received: from [fd8f:7570:feb6:1:b4eb:e902:622d:f2f0] (port=37682 helo=e0050434b2927.dyn.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLSv1:DHE-RSA-AES128-SHA:128) (Exim 4.82_1-5b7a7c0-XX) (envelope-from ) id 1b9xtn-0000KD-Nx; Mon, 06 Jun 2016 18:01:12 +0100 Received: from rmk by e0050434b2927.dyn.armlinux.org.uk with local (Exim 4.82) (envelope-from ) id 1b9xtf-0003u2-5t; Mon, 06 Jun 2016 18:01:03 +0100 In-Reply-To: <20160606164129.GM1041@n2100.armlinux.org.uk> References: <20160606164129.GM1041@n2100.armlinux.org.uk> From: Russell King To: kexec@lists.infradead.org,linux-arm-kernel@lists.infradead.org Subject: [PATCH kexec-tools v2 27/32] arm: add support for multiple reserved regions MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Mon, 06 Jun 2016 18:01:03 +0100 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160606_101036_812496_C2ED5491 X-CRM114-Status: GOOD ( 19.38 ) 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: Pratyush Anand , Baoquan He Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add support for reserving multiple memory regions rather than just a single region. Reviewed-by: Pratyush Anand Signed-off-by: Russell King --- kexec/arch/arm/crashdump-arm.c | 66 ++++++++++++++++-------------------------- 1 file changed, 25 insertions(+), 41 deletions(-) diff --git a/kexec/arch/arm/crashdump-arm.c b/kexec/arch/arm/crashdump-arm.c index 1a6ab88..9113f5e 100644 --- a/kexec/arch/arm/crashdump-arm.c +++ b/kexec/arch/arm/crashdump-arm.c @@ -55,6 +55,14 @@ struct memory_ranges usablemem_rgns = { /* memory range reserved for crashkernel */ static struct memory_range crash_kernel_mem; +/* reserved regions */ +#define CRASH_MAX_RESERVED_RANGES 2 +static struct memory_range crash_reserved_ranges[CRASH_MAX_RESERVED_RANGES]; +static struct memory_ranges crash_reserved_rgns = { + .max_size = CRASH_MAX_RESERVED_RANGES, + .ranges = crash_reserved_ranges, +}; + static struct crash_elf_info elf_info = { .class = ELFCLASS32, .data = ELFDATANATIVE, @@ -133,44 +141,6 @@ static int get_kernel_page_offset(struct kexec_info *info, } /** - * crash_exclude_range() - excludes memory region reserved for crashkernel - * - * Function locates where crashkernel reserved memory is and removes that region - * from the available memory regions. - */ -static void crash_exclude_range(void) -{ - const struct memory_range *range = &crash_kernel_mem; - int i; - - for (i = 0; i < usablemem_rgns.size; i++) { - struct memory_range *r = usablemem_rgns.ranges + i; - - /* - * We assume that crash area is fully contained in - * some larger memory area. - */ - if (r->start <= range->start && r->end >= range->end) { - struct memory_range *new; - /* - * Let's split this area into 2 smaller ones and - * remove excluded range from between. First create - * new entry for the remaining area. - */ - new = usablemem_rgns.ranges + usablemem_rgns.size; - new->start = range->end + 1; - new->end = r->end; - usablemem_rgns.size++; - /* - * Next update this area to end before excluded range. - */ - r->end = range->start - 1; - break; - } - } -} - -/** * crash_get_memory_ranges() - read system physical memory * * Function reads through system physical memory and stores found memory regions @@ -181,16 +151,28 @@ static void crash_exclude_range(void) */ static int crash_get_memory_ranges(void) { + int i; + if (usablemem_rgns.size < 1) { errno = EINVAL; return -1; } /* - * Exclude memory reserved for crashkernel (this may result a split memory - * region). + * Exclude all reserved memory from the usable memory regions. + * We want to avoid dumping the crashkernel region itself. Note + * that this may result memory regions in usablemem_rgns being + * split. */ - crash_exclude_range(); + for (i = 0; i < crash_reserved_rgns.size; i++) { + if (mem_regions_exclude(&usablemem_rgns, + &crash_reserved_rgns.ranges[i])) { + fprintf(stderr, + "Error: Number of crash memory ranges excedeed the max limit\n"); + errno = ENOMEM; + return -1; + } + } /* * Make sure that the memory regions are sorted. @@ -388,6 +370,8 @@ static int iomem_range_callback(void *UNUSED(data), int UNUSED(nr), crash_kernel_mem.start = base; crash_kernel_mem.end = base + length - 1; crash_kernel_mem.type = RANGE_RAM; + return mem_regions_add(&crash_reserved_rgns, + base, length, RANGE_RAM); } else if (strncmp(str, SYSTEM_RAM, strlen(SYSTEM_RAM)) == 0) { return mem_regions_add(&usablemem_rgns,