From patchwork Thu Aug 24 08:18:00 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 110878 Delivered-To: patch@linaro.org Received: by 10.140.95.78 with SMTP id h72csp5315583qge; Thu, 24 Aug 2017 01:19:19 -0700 (PDT) X-Received: by 10.84.218.4 with SMTP id q4mr6009465pli.202.1503562759462; Thu, 24 Aug 2017 01:19:19 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1503562759; cv=none; d=google.com; s=arc-20160816; b=DwPw2Ugitl89enzkVFxJxm4e7vf5rNwbcV25QoxvDN+ljUqod1OgN7YTzHUAx648TH 8VyFSVTn6of1Cu9XnM8HfCz0zJeOuzvznr2PKDGffbnaZz+yBWm95E8YsI+R3QBqy7/H dZz7BX66tVTYtFrIpfDdNUF+2098bgXj/38abx6yzr7htHoR/vwZKgisL4rvjfGxwoIu iXvkh8H0rvTBTuxIJvZUxBfOJTXfPesQpkKnHFAgHUzTjH4RiEIJdCkxuG2OgiWPTTkR S+/ctG1xuSMPjtrzrzUGcQFF80s9gVJeJk4k2lY9lTnRatASyfCTyic/n+Bttd6pbo2m BDow== 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=AH9ill+BBKG9jKGLdFZoHHEIy0c5O4yy5/jZBaiKyeI=; b=QGsaUfNd9nvNe5X6z51Gn+6YoD5UEnoUbCULsnbOgLYf/fRTgBn4cGYUZp3UFsK3N3 mOvjbkzlF08uHkOvxTAfvKGXWTmEAP/MmMb90xh03UqiXDmaOzWyZRwtKk+fFK0ghJvW Kmvwq2MdfrXF2PaK4OeAyKGar1muhbFOSPErkd4nNSjfImjmgjEc6wg1FHiASprdND9N IPIievxDdNdNhdOTdYL96Do01Ac8IpNsqixBXf5DYQqD7nbAkwgNDtVqWqiJzeUbFcC+ PoJsyphuY9usn/VG50hUio1Q4Npc1XVQ/g2xh2/0sKO4DJogyrmTdfoP9Ukne5DLq2WM ww2A== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=Ra2dJ5lz; 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 w88si2467457pfa.519.2017.08.24.01.19.19; Thu, 24 Aug 2017 01:19:19 -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=Ra2dJ5lz; 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 S1752131AbdHXITR (ORCPT + 26 others); Thu, 24 Aug 2017 04:19:17 -0400 Received: from mail-pg0-f52.google.com ([74.125.83.52]:33353 "EHLO mail-pg0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751422AbdHXISE (ORCPT ); Thu, 24 Aug 2017 04:18:04 -0400 Received: by mail-pg0-f52.google.com with SMTP id t3so13495700pgt.0 for ; Thu, 24 Aug 2017 01:18:03 -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=AH9ill+BBKG9jKGLdFZoHHEIy0c5O4yy5/jZBaiKyeI=; b=Ra2dJ5lzsoWv1hJCKIpv/xU10f1PySx7KWE3IlW38A99YPXiOIPCdBvHLGVrSXd0xo lW3jhbMdjjCQe8H8lNj2rE1j5k8bbu0rLim81nUrAgnUqtkx+JdUJpZxclRts00wOSE4 QZlwwT2Hh4rWPTQXmGhew6PzrABNyw6lX78nc= 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=AH9ill+BBKG9jKGLdFZoHHEIy0c5O4yy5/jZBaiKyeI=; b=dh43EiY3wOJMDtq3FjJycattMC+xC4td+Dy+mGOFoJgueKqH1fpjmVDyXOvBkmMtVm RqDX7hgJSfr7HS/xzUGfyoxjvbNP+xqzY8HJjCkY8oGM3rbY680cgU6600Sx5m9jcNGx X8QeYgzKAuWCkz4ag2XuV7yN+vIPH9f2qyD4NTd5n1Cv4f4cQ3mjP8+Cbfw13JdBTp6c //tABovqVt7cXz2hWguq2T0i+04YZPLMTaPA4diODkh41AmyOIiVrxNlud89oggjVm8p xIBiqB3futgt8swplO7KSrAZHRj8YQTlUKe0wnV8EOEHgVTqBnq/yReDwQ0HAB04fmzQ jkkg== X-Gm-Message-State: AHYfb5iI6P5ktUlfAfZP5fifWkpULxLZb3WiXGhLscHnxFMDRPMsvUBe hobv4r6jnz7LI5Jl X-Received: by 10.84.167.2 with SMTP id c2mr6042381plb.371.1503562683677; Thu, 24 Aug 2017 01:18:03 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id o9sm6691952pfk.91.2017.08.24.01.18.02 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 24 Aug 2017 01:18:03 -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 03/14] resource: add walk_system_ram_res_rev() Date: Thu, 24 Aug 2017 17:18:00 +0900 Message-Id: <20170824081811.19299-4-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170824081811.19299-1-takahiro.akashi@linaro.org> References: <20170824081811.19299-1-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 | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 51 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..1d6d734c75ac 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -23,6 +23,7 @@ #include #include #include +#include #include @@ -469,6 +470,53 @@ 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 */ +again: + /* 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) { + /* unlikely but */ + vfree(rams); + count += 16; + goto again; + } + + 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; + } + + vfree(rams); + return ret; +} + #if !defined(CONFIG_ARCH_HAS_WALK_MEMORY) /*