From patchwork Tue Oct 24 06:23:46 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 116891 Delivered-To: patch@linaro.org Received: by 10.140.22.164 with SMTP id 33csp5451614qgn; Mon, 23 Oct 2017 23:21:46 -0700 (PDT) X-Received: by 10.99.179.5 with SMTP id i5mr13281304pgf.199.1508826106327; Mon, 23 Oct 2017 23:21:46 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1508826106; cv=none; d=google.com; s=arc-20160816; b=nFTSw2po+WwvxskxtVT6OYQsozBShhDQBgCnjcKZZdAFuy+lwNHtoTWmCd8qWv8dKo mZ3O1uVddk2ji7BRw7vdDTQDSwYimDj36XDAT2Ia86HdRctwNpdUjuBBKzS8hbTFh2Hh bcHJySBBnjxHCCCAU4yCJJgmZorhcbrEIkKMEMC0WIKux25ryGbGQ5JNeuTvLmAJ03UO bDyfAXJhRxV+D6+4Ps3yL3xa+mnWBHiW9DRp2pwoJ7WrgyQULm962N+NZl+DR37dPFOQ qTZ0vP9zrtcqd5c1+jveWnZGH2Xzh3Y6kfY/v9JlNSZJFkkxSpOJ0lx/U509LMlZHyPT nAEA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=qXdYk7Urfs9sg9VuSaIsAvtksSYSR/RmSQ5t2VIYZpY=; b=wQSztW4+hDNo5VvYEAWIqJvJgHq8OBhVaHybOs/n95QPPvBHnTBULL+T4KKDCNGPIr oQPd+41pt4+m2LIe+CfZcq7VsPpE9Nx9fluYZzBrP9+AqGoTqHkpXpLEcGyGBPVJYisv 1DPMBGPmdj1nQN4H5AJN70IgdlvLVSlc8zF3JnKiB1GDXkYEjkPQOx7airGzso7HbRGD XsqDusps25tfl1Mb5pObrNYa/PbMGTvw7ON4AvWNNTWSl8KayApz0fqRd48cVi2iuvpw KhGUCH76KomdIE0nPMfzXS6Bw1n2lK2Eaij35dtfvfWiAo+SHe9n79KT8iKTPgW1CBEt h4xw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=dTWW0y17; 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 Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id k82si6521617pfg.374.2017.10.23.23.21.46; Mon, 23 Oct 2017 23:21:46 -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=dTWW0y17; 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 S1751751AbdJXGVo (ORCPT + 27 others); Tue, 24 Oct 2017 02:21:44 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:48645 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751546AbdJXGVk (ORCPT ); Tue, 24 Oct 2017 02:21:40 -0400 Received: by mail-pf0-f195.google.com with SMTP id b79so18950133pfk.5 for ; Mon, 23 Oct 2017 23:21:39 -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=qXdYk7Urfs9sg9VuSaIsAvtksSYSR/RmSQ5t2VIYZpY=; b=dTWW0y17MbKiPffEyu5o1xonMuIgJsqiCZlO9T6r8rQZYihaMUfJuXr0ILc3PoVrS6 YV11j3QRO9g/ceM5To719AxvBkSFepXUgd11ugmLYNyXQY/2CMVs0WuUkNxDLyBDt5ll M8ti12s8orojszJOoOXzdChXGUdG0bQgnK21A= 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=qXdYk7Urfs9sg9VuSaIsAvtksSYSR/RmSQ5t2VIYZpY=; b=DX3fkxr6EqAyWZ+lmeXZOXp6pmVdCkbfNZ6oi103+oj50s6KxMbD1vHJ0i58+RsysV V3RjWhL2o0whxy3xoB048U+U8cA9rxhN7sxZhnwoRY2oaKzXlr/U/99UGIXJ+cJWQzNk Z213wuPt7XbNUi7ZsE08mxkQGKAJzFMzTpwUUkTuxfnbMJaD6ahNshaff7yP97KaxcM2 xBtG0itR9Mc4VPO1EfGYJwEi7i3vyDgG0hVcfUT6TCTFfMLxXNPJIvyysUT2MknwhEXG yHchCI5J+jEo1vGUq1LWkF9GPTJ2PTtS9sWap3G9UJJyFzExptR4as7tWB3SVWMIEurY fScA== X-Gm-Message-State: AMCzsaUdMWJPubje+FCFIObuEsp9zCx63a1f2DFXC88gT6l2cS2rLE0W U6marTZ/WGWJxSE10q7fbS8WVA== X-Google-Smtp-Source: ABhQp+TeQn5EA+D3a1NrqZhI+UBb+CYOWSoX7f5SbkMMeswHYDSg1BUHiUYk/46flBoEiD+1arRIrg== X-Received: by 10.99.119.4 with SMTP id s4mr13624685pgc.377.1508826099592; Mon, 23 Oct 2017 23:21:39 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id u197sm17569500pgb.33.2017.10.23.23.21.38 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 23 Oct 2017 23:21:38 -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, julien.thierry@arm.com Cc: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, AKASHI Takahiro , Linus Torvalds Subject: [PATCH v6 02/10] resource: add walk_system_ram_res_rev() Date: Tue, 24 Oct 2017 15:23:46 +0900 Message-Id: <20171024062354.22621-3-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20171024062354.22621-1-takahiro.akashi@linaro.org> References: <20171024062354.22621-1-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 | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 60 insertions(+) -- 2.14.1 diff --git a/include/linux/ioport.h b/include/linux/ioport.h index f5cf32e80041..62eb62b98118 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -273,6 +273,9 @@ 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..69c31454cb2e 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -23,6 +23,8 @@ #include #include #include +#include +#include #include @@ -469,6 +471,61 @@ 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; + int rams_size = 16, i; + int ret = -1; + + /* create a list */ + rams = vmalloc(sizeof(struct resource) * rams_size); + if (!rams) + return ret; + + res.start = start; + res.end = end; + res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + i = 0; + while ((res.start < res.end) && + (!find_next_iomem_res(&res, IORES_DESC_NONE, true))) { + if (i >= rams_size) { + /* re-alloc */ + struct resource *rams_new; + int rams_new_size; + + rams_new_size = rams_size + 16; + rams_new = vmalloc(sizeof(struct resource) + * rams_new_size); + if (!rams_new) + goto out; + + memcpy(rams_new, rams, + sizeof(struct resource) * rams_size); + vfree(rams); + rams = rams_new; + rams_size = rams_new_size; + } + + rams[i].start = res.start; + rams[i++].end = res.end; + + res.start = res.end + 1; + res.end = 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) /*