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[209.132.180.67]) by mx.google.com with ESMTP id s7si498537plj.763.2017.09.15.03.58.05; Fri, 15 Sep 2017 03:58:05 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=SRby9q8W; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751457AbdIOK6D (ORCPT + 26 others); Fri, 15 Sep 2017 06:58:03 -0400 Received: from mail-pg0-f54.google.com ([74.125.83.54]:51322 "EHLO mail-pg0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751157AbdIOK6B (ORCPT ); Fri, 15 Sep 2017 06:58:01 -0400 Received: by mail-pg0-f54.google.com with SMTP id k193so1302338pgc.8 for ; Fri, 15 Sep 2017 03:58:01 -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=Ni1zv4TS4KemAcbZg/ZChqjjHLQWmaU1Iruz6cZLyuY=; b=SRby9q8W5vuAmhCYfAw54YpWAr2Fei9Mkjt6nDD3G5xXFQqCCAaAE5lJOYw9zP30xq fEgw6pSh8plbf8vNUxGim4+NqHptfN2nz7eslp0Imj69Oo4TLqkOQFvYemqgTNos8hkO 7wVLJKh0eKs34PhUloGGQ3ZfPtzNqJs7bjR+w= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Ni1zv4TS4KemAcbZg/ZChqjjHLQWmaU1Iruz6cZLyuY=; b=bJaGpYb4n0UennaGpQFuaM68YjGkiWO74Z8Df3wl2ut9SE/quVkq0f5k10bGtv0pmN czYC+NfTJArvQqTWtcX3zoSEZ6sXdOXLuKUxmiC5wQ8QcQtGcjLwA4uq6FRZ/cu1rp/U cdgmF393clrH8h8BTI/tJTE6mgObL5uZk67uhxLUHNBJNHDA5gyQ7NBmGhR5aZMDDNKL rT5xv8NuRwiOPwksltS7EnsHMH82fs1/qUTvAh8nb6sPc/3zzlMBB3mwiFYASTOhCudS C3hPxNzBsDwcbZDs5Xq8u/oaeElMFpbvrXFrrReFDW9mskfiXoiXdCy/yggd6MDH8T4J SoAQ== X-Gm-Message-State: AHPjjUjMNHSxvR8xBAuI6ZtYIouMK8HjbziXw8KLzA3hvZ+u4pwgFMpd R/IOxF7vNiS80hhQ X-Google-Smtp-Source: ADKCNb7Xm8qdV3l2Cs77V2lCPM53fiqK286lhNqNmpc3mjMTw13Ab4LSgrtFzrK+U712gRUg1fZXWA== X-Received: by 10.84.238.198 with SMTP id l6mr26971470pln.152.1505473081000; Fri, 15 Sep 2017 03:58:01 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id f11sm2405937pgt.65.2017.09.15.03.58.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 15 Sep 2017 03:58:00 -0700 (PDT) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, bauerman@linux.vnet.ibm.com, dhowells@redhat.com, vgoyal@redhat.com, herbert@gondor.apana.org.au, davem@davemloft.net, akpm@linux-foundation.org, mpe@ellerman.id.au, dyoung@redhat.com, bhe@redhat.com, arnd@arndb.de, ard.biesheuvel@linaro.org Cc: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, AKASHI Takahiro , Linus Torvalds Subject: [PATCH v3 02/10] resource: add walk_system_ram_res_rev() Date: Fri, 15 Sep 2017 19:59:24 +0900 Message-Id: <20170915105932.25338-3-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170915105932.25338-1-takahiro.akashi@linaro.org> References: <20170915105932.25338-1-takahiro.akashi@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This function, being a variant of walk_system_ram_res() introduced in commit 8c86e70acead ("resource: provide new functions to walk through resources"), walks through a list of all the resources of System RAM in reversed order, i.e., from higher to lower. It will be used in kexec_file implementation on arm64. Signed-off-by: AKASHI Takahiro Cc: Vivek Goyal Cc: Andrew Morton Cc: Linus Torvalds --- include/linux/ioport.h | 3 +++ kernel/resource.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+) -- 2.14.1 diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 6230064d7f95..9a212266299f 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -271,6 +271,9 @@ extern int walk_system_ram_res(u64 start, u64 end, void *arg, int (*func)(u64, u64, void *)); extern int +walk_system_ram_res_rev(u64 start, u64 end, void *arg, + int (*func)(u64, u64, void *)); +extern int walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end, void *arg, int (*func)(u64, u64, void *)); diff --git a/kernel/resource.c b/kernel/resource.c index 9b5f04404152..572f2f91ce9c 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -23,6 +23,8 @@ #include #include #include +#include +#include #include @@ -469,6 +471,63 @@ int walk_system_ram_res(u64 start, u64 end, void *arg, return ret; } +int walk_system_ram_res_rev(u64 start, u64 end, void *arg, + int (*func)(u64, u64, void *)) +{ + struct resource res, *rams; + u64 orig_end; + int count, i; + int ret = -1; + + count = 16; /* initial */ + + /* create a list */ + rams = vmalloc(sizeof(struct resource) * count); + if (!rams) + return ret; + + res.start = start; + res.end = end; + res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + orig_end = res.end; + i = 0; + while ((res.start < res.end) && + (!find_next_iomem_res(&res, IORES_DESC_NONE, true))) { + if (i >= count) { + /* re-alloc */ + struct resource *rams_new; + int count_new; + + count_new = count + 16; + rams_new = vmalloc(sizeof(struct resource) * count_new); + if (!rams_new) + goto out; + + memcpy(rams_new, rams, count); + vfree(rams); + rams = rams_new; + count = count_new; + } + + rams[i].start = res.start; + rams[i++].end = res.end; + + res.start = res.end + 1; + res.end = orig_end; + } + + /* go reverse */ + for (i--; i >= 0; i--) { + ret = (*func)(rams[i].start, rams[i].end, arg); + if (ret) + break; + } + +out: + vfree(rams); + return ret; +} + #if !defined(CONFIG_ARCH_HAS_WALK_MEMORY) /*