Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756073AbcJFXei (ORCPT ); Thu, 6 Oct 2016 19:34:38 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:36051 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752809AbcJFXea (ORCPT ); Thu, 6 Oct 2016 19:34:30 -0400 From: Tushar Dave To: davem@davemloft.net, chris.hyser@oracle.com, sowmini.varadhan@oracle.com, vgupta@synopsys.com, robin.murphy@arm.com, jroedel@suse.de, egtvedt@samfundet.no, krzk@kernel.org, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 1/6] sparc64: Add FORCE_MAX_ZONEORDER and default to 13 Date: Thu, 6 Oct 2016 16:33:31 -0700 Message-Id: <1475796816-14448-2-git-send-email-tushar.n.dave@oracle.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1475796816-14448-1-git-send-email-tushar.n.dave@oracle.com> References: <1475796816-14448-1-git-send-email-tushar.n.dave@oracle.com> X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1450 Lines: 50 From: Dave Kleikamp This change allows ATU (new IOMMU) in SPARC systems to request large (32M) contiguous memory during boot for creating IOTSB backing store. Signed-off-by: Dave Kleikamp Signed-off-by: Tushar Dave --- arch/sparc/Kconfig | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 59b0960..338282d 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -91,6 +91,10 @@ config ARCH_DEFCONFIG config ARCH_PROC_KCORE_TEXT def_bool y +config ARCH_ATU + bool + default y if SPARC64 + config IOMMU_HELPER bool default y if SPARC64 @@ -306,6 +310,20 @@ config ARCH_SPARSEMEM_ENABLE config ARCH_SPARSEMEM_DEFAULT def_bool y if SPARC64 +config FORCE_MAX_ZONEORDER + int "Maximum zone order" + default "13" + help + The kernel memory allocator divides physically contiguous memory + blocks into "zones", where each zone is a power of two number of + pages. This option selects the largest power of two that the kernel + keeps in the memory allocator. If you need to allocate very large + blocks of physically contiguous memory, then you may need to + increase this value. + + This config option is actually maximum order plus one. For example, + a value of 13 means that the largest free memory block is 2^12 pages. + source "mm/Kconfig" if SPARC64 -- 1.9.1