Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758196AbZLPOoI (ORCPT ); Wed, 16 Dec 2009 09:44:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755359AbZLPOoF (ORCPT ); Wed, 16 Dec 2009 09:44:05 -0500 Received: from mail-fx0-f221.google.com ([209.85.220.221]:60955 "EHLO mail-fx0-f221.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753817AbZLPOoA (ORCPT ); Wed, 16 Dec 2009 09:44:00 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=Svz42KAkWsMs+g6VYYp0Q+QrBuceLAS2p+Ibc/WJCBE8UkbX7bsH3/M4Golwd+dH6L C/zPB+huWfssPlD02P0H9hM7j1UZLeb9LqGQKQYY5ajNrFHoPEVxmW8tCdAQxKMw1ZLo f4qir04DLzGNIQ0lFQGN6AEhfANSoccwVCdVk= Date: Wed, 16 Dec 2009 15:43:55 +0100 From: Andreas Herrmann To: Ingo Molnar , "H. Peter Anvin" , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, Borislav Petkov Subject: [PATCH v2] x86, amd: Get multi-node CPU info from NodeId MSR instead of PCI config space Message-ID: <20091216144355.GB28798@alberich.amd.com> References: <20091215124418.GA6414@alberich.amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091215124418.GA6414@alberich.amd.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3818 Lines: 121 Use NodeId MSR to get NodeId and number of nodes per processor. Signed-off-by: Andreas Herrmann --- arch/x86/include/asm/cpufeature.h | 1 + arch/x86/include/asm/msr-index.h | 1 + arch/x86/kernel/cpu/amd.c | 53 ++++++++++-------------------------- 3 files changed, 17 insertions(+), 38 deletions(-) diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h index 613700f..637e1ec 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -153,6 +153,7 @@ #define X86_FEATURE_SSE5 (6*32+11) /* SSE-5 */ #define X86_FEATURE_SKINIT (6*32+12) /* SKINIT/STGI instructions */ #define X86_FEATURE_WDT (6*32+13) /* Watchdog timer */ +#define X86_FEATURE_NODEID_MSR (6*32+19) /* NodeId MSR */ /* * Auxiliary flags: Linux defined - For features scattered in various diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index 4ffe09b..9d976a7 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -123,6 +123,7 @@ #define FAM10H_MMIO_CONF_BUSRANGE_SHIFT 2 #define FAM10H_MMIO_CONF_BASE_MASK 0xfffffff #define FAM10H_MMIO_CONF_BASE_SHIFT 20 +#define MSR_FAM10H_NODE_ID 0xc001100c /* K8 MSRs */ #define MSR_K8_TOP_MEM1 0xc001001a diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 7128b37..5dcd638 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -254,59 +254,36 @@ static int __cpuinit nearby_node(int apicid) /* * Fixup core topology information for AMD multi-node processors. - * Assumption 1: Number of cores in each internal node is the same. - * Assumption 2: Mixed systems with both single-node and dual-node - * processors are not supported. + * Assumption: Number of cores in each internal node is the same. */ #ifdef CONFIG_X86_HT static void __cpuinit amd_fixup_dcm(struct cpuinfo_x86 *c) { -#ifdef CONFIG_PCI - u32 t, cpn; - u8 n, n_id; + unsigned long long value; + u32 nodes, cores_per_node; int cpu = smp_processor_id(); + if (!cpu_has(c, X86_FEATURE_NODEID_MSR)) + return; + /* fixup topology information only once for a core */ if (cpu_has(c, X86_FEATURE_AMD_DCM)) return; - /* check for multi-node processor on boot cpu */ - t = read_pci_config(0, 24, 3, 0xe8); - if (!(t & (1 << 29))) + rdmsrl(MSR_FAM10H_NODE_ID, value); + + nodes = ((value >> 3) & 7) + 1; + if (nodes == 1) return; set_cpu_cap(c, X86_FEATURE_AMD_DCM); + cores_per_node = c->x86_max_cores / nodes; - /* cores per node: each internal node has half the number of cores */ - cpn = c->x86_max_cores >> 1; + /* store NodeID, use llc_shared_map to store sibling info */ + per_cpu(cpu_llc_id, cpu) = value & 7; - /* even-numbered NB_id of this dual-node processor */ - n = c->phys_proc_id << 1; - - /* - * determine internal node id and assign cores fifty-fifty to - * each node of the dual-node processor - */ - t = read_pci_config(0, 24 + n, 3, 0xe8); - n = (t>>30) & 0x3; - if (n == 0) { - if (c->cpu_core_id < cpn) - n_id = 0; - else - n_id = 1; - } else { - if (c->cpu_core_id < cpn) - n_id = 1; - else - n_id = 0; - } - - /* compute entire NodeID, use llc_shared_map to store sibling info */ - per_cpu(cpu_llc_id, cpu) = (c->phys_proc_id << 1) + n_id; - - /* fixup core id to be in range from 0 to cpn */ - c->cpu_core_id = c->cpu_core_id % cpn; -#endif + /* fixup core id to be in range from 0 to (cores_per_node - 1) */ + c->cpu_core_id = c->cpu_core_id % cores_per_node; } #endif -- 1.6.5.3 -- 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/