From owner-svn-src-all@FreeBSD.ORG Thu Jan 17 21:32:26 2013 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id AEA9EA89; Thu, 17 Jan 2013 21:32:26 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) by mx1.freebsd.org (Postfix) with ESMTP id 925121FB; Thu, 17 Jan 2013 21:32:26 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.5/8.14.5) with ESMTP id r0HLWQNv004839; Thu, 17 Jan 2013 21:32:26 GMT (envelope-from jhb@svn.freebsd.org) Received: (from jhb@localhost) by svn.freebsd.org (8.14.5/8.14.5/Submit) id r0HLWQHD004835; Thu, 17 Jan 2013 21:32:26 GMT (envelope-from jhb@svn.freebsd.org) Message-Id: <201301172132.r0HLWQHD004835@svn.freebsd.org> From: John Baldwin Date: Thu, 17 Jan 2013 21:32:26 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r245577 - in head/sys: amd64/amd64 i386/i386 x86/x86 X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Jan 2013 21:32:26 -0000 Author: jhb Date: Thu Jan 17 21:32:25 2013 New Revision: 245577 URL: http://svnweb.freebsd.org/changeset/base/245577 Log: Don't attempt to use clflush on the local APIC register window. Various CPUs exhibit bad behavior if this is done (Intel Errata AAJ3, hangs on Pentium-M, and trashing of the local APIC registers on a VIA C7). The local APIC is implicitly mapped UC already via MTRRs, so the clflush isn't necessary anyway. MFC after: 2 weeks Modified: head/sys/amd64/amd64/pmap.c head/sys/i386/i386/pmap.c head/sys/x86/x86/local_apic.c Modified: head/sys/amd64/amd64/pmap.c ============================================================================== --- head/sys/amd64/amd64/pmap.c Thu Jan 17 21:32:03 2013 (r245576) +++ head/sys/amd64/amd64/pmap.c Thu Jan 17 21:32:25 2013 (r245577) @@ -1150,6 +1150,15 @@ pmap_invalidate_cache_range(vm_offset_t eva - sva < PMAP_CLFLUSH_THRESHOLD) { /* + * XXX: Some CPUs fault, hang, or trash the local APIC + * registers if we use CLFLUSH on the local APIC + * range. The local APIC is always uncached, so we + * don't need to flush for that range anyway. + */ + if (pmap_kextract(sva) == lapic_paddr) + return; + + /* * Otherwise, do per-cache line flush. Use the mfence * instruction to insure that previous stores are * included in the write-back. The processor Modified: head/sys/i386/i386/pmap.c ============================================================================== --- head/sys/i386/i386/pmap.c Thu Jan 17 21:32:03 2013 (r245576) +++ head/sys/i386/i386/pmap.c Thu Jan 17 21:32:25 2013 (r245577) @@ -96,6 +96,7 @@ __FBSDID("$FreeBSD$"); * and to when physical maps must be made correct. */ +#include "opt_apic.h" #include "opt_cpu.h" #include "opt_pmap.h" #include "opt_smp.h" @@ -1175,6 +1176,16 @@ pmap_invalidate_cache_range(vm_offset_t else if ((cpu_feature & CPUID_CLFSH) != 0 && eva - sva < PMAP_CLFLUSH_THRESHOLD) { +#ifdef DEV_APIC + /* + * XXX: Some CPUs fault, hang, or trash the local APIC + * registers if we use CLFLUSH on the local APIC + * range. The local APIC is always uncached, so we + * don't need to flush for that range anyway. + */ + if (pmap_kextract(sva) == lapic_paddr) + return; +#endif /* * Otherwise, do per-cache line flush. Use the mfence * instruction to insure that previous stores are Modified: head/sys/x86/x86/local_apic.c ============================================================================== --- head/sys/x86/x86/local_apic.c Thu Jan 17 21:32:03 2013 (r245576) +++ head/sys/x86/x86/local_apic.c Thu Jan 17 21:32:25 2013 (r245577) @@ -227,8 +227,8 @@ lapic_init(vm_paddr_t addr) /* Map the local APIC and setup the spurious interrupt handler. */ KASSERT(trunc_page(addr) == addr, ("local APIC not aligned on a page boundary")); - lapic = pmap_mapdev(addr, sizeof(lapic_t)); lapic_paddr = addr; + lapic = pmap_mapdev(addr, sizeof(lapic_t)); setidt(APIC_SPURIOUS_INT, IDTVEC(spuriousint), SDT_APIC, SEL_KPL, GSEL_APIC);