From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751201AbYJ1Tkq (ORCPT ); Tue, 28 Oct 2008 15:40:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753961AbYJ1Tkg (ORCPT ); Tue, 28 Oct 2008 15:40:36 -0400 Received: from hera.kernel.org ([140.211.167.34]:43046 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751883AbYJ1Tkf (ORCPT ); Tue, 28 Oct 2008 15:40:35 -0400 Message-ID: <49076A6B.4020904@kernel.org> Date: Tue, 28 Oct 2008 12:39:23 -0700 From: Yinghai Lu User-Agent: Thunderbird 2.0.0.17 (X11/20080922) MIME-Version: 1.0 To: Ingo Molnar , Suresh Siddha , Thomas Gleixner , "H. Peter Anvin" , Andrew Morton CC: "linux-kernel@vger.kernel.org" Subject: [PATCH] x86: fix init_memory_mapping for [dc000000 - e0000000) - v2 References: <490406FD.30604@kernel.org> <20081027165028.GB30573@linux-os.sc.intel.com> <20081027175547.GE3046@elte.hu> <49067058.7010106@kernel.org> <20081028092737.GT15734@elte.hu> <20081028093930.GA9699@elte.hu> <20081028094758.GA11958@elte.hu> <4906E048.6060006@kernel.org> <20081028095244.GY15734@elte.hu> In-Reply-To: <20081028095244.GY15734@elte.hu> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Impact: change over-mapping to precise mapping, fix /proc/meminfo output v2: fix less 1G ram system handling when gart aperture is 0xdc000000 - 0xe0000000 it return 0xc0000000 - 0xe0000000 that is not right. this patch fix that will get exact mapping on 256g sytem with that aperture after patch LBSuse:~ # cat /proc/meminfo MemTotal: 264742432 kB MemFree: 263920628 kB Buffers: 1416 kB Cached: 24468 kB ... DirectMap4k: 5760 kB DirectMap2M: 3205120 kB DirectMap1G: 265289728 kB it is consistent to LBSuse:~ # cat /sys/kernel/debug/kernel_page_tables .. ---[ Low Kernel Mapping ]--- 0xffff880000000000-0xffff880000200000 2M RW GLB x pte 0xffff880000200000-0xffff880040000000 1022M RW PSE GLB x pmd 0xffff880040000000-0xffff8800c0000000 2G RW PSE GLB NX pud 0xffff8800c0000000-0xffff8800d7e00000 382M RW PSE GLB NX pmd 0xffff8800d7e00000-0xffff8800d7fa0000 1664K RW GLB NX pte 0xffff8800d7fa0000-0xffff8800d8000000 384K pte 0xffff8800d8000000-0xffff8800dc000000 64M pmd 0xffff8800dc000000-0xffff8800e0000000 64M RW PSE GLB NX pmd 0xffff8800e0000000-0xffff880100000000 512M pmd 0xffff880100000000-0xffff880800000000 28G RW PSE GLB NX pud 0xffff880800000000-0xffff880824600000 582M RW PSE GLB NX pmd 0xffff880824600000-0xffff8808247f0000 1984K RW GLB NX pte 0xffff8808247f0000-0xffff880824800000 64K RW PCD GLB NX pte 0xffff880824800000-0xffff880840000000 440M RW PSE GLB NX pmd 0xffff880840000000-0xffff884000000000 223G RW PSE GLB NX pud 0xffff884000000000-0xffff884028000000 640M RW PSE GLB NX pmd 0xffff884028000000-0xffff884040000000 384M pmd 0xffff884040000000-0xffff888000000000 255G pud 0xffff888000000000-0xffffc20000000000 58880G pgd Signed-off-by: Yinghai Lu --- arch/x86/mm/init_64.c | 50 +++++++++++++++++++++++++++++++++----------------- 1 file changed, 33 insertions(+), 17 deletions(-) Index: linux-2.6/arch/x86/mm/init_64.c =================================================================== --- linux-2.6.orig/arch/x86/mm/init_64.c +++ linux-2.6/arch/x86/mm/init_64.c @@ -671,12 +671,13 @@ unsigned long __init_refok init_memory_m unsigned long last_map_addr = 0; unsigned long page_size_mask = 0; unsigned long start_pfn, end_pfn; + unsigned long pos; struct map_range mr[NR_RANGE_MR]; int nr_range, i; int use_pse, use_gbpages; - printk(KERN_INFO "init_memory_mapping\n"); + printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end); /* * Find space for the kernel direct mapping tables. @@ -710,35 +711,50 @@ unsigned long __init_refok init_memory_m /* head if not big page alignment ?*/ start_pfn = start >> PAGE_SHIFT; - end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT) + pos = start_pfn << PAGE_SHIFT; + end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); - nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); + if (start_pfn < end_pfn) { + nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); + pos = end_pfn << PAGE_SHIFT; + } /* big page (2M) range*/ - start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT) + start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); - end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT) + end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); - if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT))) - end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)); - nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, - page_size_mask & (1< ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) + end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); + if (start_pfn < end_pfn) { + nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, + page_size_mask & (1<>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); - nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, + start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) + << (PUD_SHIFT - PAGE_SHIFT); + end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); + if (start_pfn < end_pfn) { + nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, page_size_mask & ((1<>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); - nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, - page_size_mask & (1<>PMD_SHIFT) + << (PMD_SHIFT - PAGE_SHIFT); + end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); + if (start_pfn < end_pfn) { + nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, + page_size_mask & (1<>PAGE_SHIFT; end_pfn = end>>PAGE_SHIFT; nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);