Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764141AbXILTZA (ORCPT ); Wed, 12 Sep 2007 15:25:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753047AbXILTYj (ORCPT ); Wed, 12 Sep 2007 15:24:39 -0400 Received: from sca-es-mail-2.Sun.COM ([192.18.43.133]:57639 "EHLO sca-es-mail-2.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752279AbXILTYi (ORCPT ); Wed, 12 Sep 2007 15:24:38 -0400 Date: Wed, 12 Sep 2007 12:33:38 -0700 From: Yinghai Lu Subject: [PATCH] x86_64: check and enable MMCONFIG for AMD Family 10h Opteron To: Andrew Morton , Andi Kleen , Jeff Garzik , Greg KH Cc: Linux Kernel Mailing List Reply-to: Yinghai Lu Message-id: <200709121233.39218.yinghai.lu@sun.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT Content-disposition: inline User-Agent: KMail/1.8.2 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1708 Lines: 56 [PATCH] x86_64: check and enable MMCONFIG for AMD Family 10h Opteron Signed-off-by: Yinghai Lu Index: linux-2.6/arch/x86_64/kernel/setup.c =================================================================== --- linux-2.6.orig/arch/x86_64/kernel/setup.c 2007-09-12 11:28:08.000000000 -0700 +++ linux-2.6/arch/x86_64/kernel/setup.c 2007-09-12 12:09:32.000000000 -0700 @@ -507,6 +507,32 @@ } #endif +/*[39:8] */ +/* why not using 0xfe000000 ? */ +#define FAM10H_PCI_MMIO_BASE 0xc0000000 +static void fam10h_check_enable_mmcfg(struct cpuinfo_x86 *c) +{ + u32 low, high, address; + + address = 0xc0010058; + if (rdmsr_safe(address, &low, &high)) + return; + + if (low & 1) + return; + + printk(KERN_INFO "Enable MMCONFIG on AMD Family 10h\n"); + /* + * if it is not enable, let enable it and assume only one segement + * with 256 buses + */ + low &= ~(0xfff00000 | (0xf<<2)); + low |= (8<<2) | (1<<0); + high &= ~(0x0000ffff); + high |= (FAM10H_PCI_MMIO_BASE>>(32-8)); + wrmsr_safe(address, low, high); +} + /* * On a AMD dual core setup the lower bits of the APIC id distingush the cores. * Assumes number of cores is a power of two. @@ -655,6 +681,9 @@ /* Family 10 doesn't support C states in MWAIT so don't use it */ if (c->x86 == 0x10 && !force_mwait) clear_bit(X86_FEATURE_MWAIT, &c->x86_capability); + + if (c->x86 == 0x10) + fam10h_check_enable_mmcfg(c); } static void __cpuinit detect_ht(struct cpuinfo_x86 *c) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/