aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/cpu/intel.c
AgeCommit message (Collapse)Author
2009-06-15x86: add hooks for kmemcheckVegard Nossum
The hooks that we modify are: - Page fault handler (to handle kmemcheck faults) - Debug exception handler (to hide pages after single-stepping the instruction that caused the page fault) Also redefine memset() to use the optimized version if kmemcheck is enabled. (Thanks to Pekka Enberg for minimizing the impact on the page fault handler.) As kmemcheck doesn't handle MMX/SSE instructions (yet), we also disable the optimized xor code, and rely instead on the generic C implementation in order to avoid false-positive warnings. Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no> [whitespace fixlet] Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu> [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>
2009-05-18x86: don't call read_apic_id if !cpu_has_apicYinghai Lu
should not call that if apic is disabled. [ Impact: fix crash on certain UP configs ] Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Cyrill Gorcunov <gorcunov@gmail.com> LKML-Reference: <4A09CCBB.2000306@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-28Merge branch 'linus' into x86/coreIngo Molnar
2009-03-27Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2Ingo Molnar
Conflicts: arch/parisc/kernel/irq.c arch/x86/include/asm/fixmap_64.h arch/x86/include/asm/setup.h kernel/irq/handle.c Semantic merge: arch/x86/include/asm/fixmap.h Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-14Merge branches 'x86/apic', 'x86/asm', 'x86/cleanups', 'x86/debug', ↵Ingo Molnar
'x86/kconfig', 'x86/mm', 'x86/ptrace', 'x86/setup' and 'x86/urgent'; commit 'v2.6.29-rc8' into x86/core
2009-03-13x86, 32-bit: also use cpuinfo_x86's x86_{phys,virt}_bits membersJan Beulich
Impact: 32/64-bit consolidation In a first step, this allows fixing phys_addr_valid() for PAE (which until now reported all addresses to be valid). Subsequently, this will also allow simplifying some MTRR handling code. Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <49B9101E.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-12x86: move various CPU initialization objects into .cpuinit.rodataJan Beulich
Impact: debuggability and micro-optimization Putting whatever is possible into the (final) .rodata section increases the likelihood of catching memory corruption bugs early, and reduces false cache line sharing. Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <49B90961.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-08x86: remove smp_apply_quirks()/smp_checks()Yinghai Lu
Impact: cleanup and code size reduction on 64-bit This code is only applied to Intel Pentium and AMD K7 32-bit cpus. Move those checks to intel_init()/amd_init() for 32-bit so 64-bit will not build this code. Also change to use cpu_index check to see if we need to emit warning. Signed-off-by: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <49B377D2.8030108@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-26x86: set X86_FEATURE_TSC_RELIABLEIngo Molnar
If the TSC is constant and non-stop, also set it reliable. (We will turn this off in DMI quirks for multi-chassis systems) The performance number on a 16-way Nehalem system running 32 tasks that context-switch between each other is significant: sched_clock_stable=0 sched_clock_stable=1 .................... .................... 22.456925 million/sec 24.306972 million/sec [+8.2%] lmbench's "lat_ctx -s 0 2" goes from 0.63 microseconds to 0.59 microseconds - a 6.7% increase in context-switching performance. Perfstat of 1 million pipe context switches between two tasks: Performance counter stats for './pipe-test-1m': [before] [after] ............ ............ 37621.421089 36436.848378 task clock ticks (msecs) 0 0 CPU migrations (events) 2000274 2000189 context switches (events) 194 193 pagefaults (events) 8433799643 8171016416 CPU cycles (events) -3.21% 8370133368 8180999694 instructions (events) -2.31% 4158565 3895941 cache references (events) -6.74% 44312 46264 cache misses (events) 2349.287976 2279.362465 wall-time (msecs) -3.06% The speedup comes straight from the reduction in the instruction count. sched_clock_cpu() got simpler and the whole workload thus executes faster. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-20Merge branches 'x86/asm', 'x86/cleanups' and 'x86/headers' into x86/coreIngo Molnar
2009-02-20x86: use symbolic constants for MSR_IA32_MISC_ENABLE bitsVegard Nossum
Impact: Cleanup. No functional changes. Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-17x86, apic: remove duplicate asm/apic.h inclusionsIngo Molnar
Impact: cleanup Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-17x86, apic: remove genapic.hIngo Molnar
Impact: cleanup Remove genapic.h and remove all references to it. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-13Merge branch 'linus' into x86/apicIngo Molnar
Conflicts: arch/x86/kernel/acpi/boot.c arch/x86/mm/fault.c
2009-02-09x86: add clflush before monitor for Intel 7400 seriesPallipadi, Venkatesh
For Intel 7400 series CPUs, the recommendation is to use a clflush on the monitored address just before monitor and mwait pair [1]. This clflush makes sure that there are no false wakeups from mwait when the monitored address was recently written to. [1] "MONITOR/MWAIT Recommendations for Intel Xeon Processor 7400 series" section in specification update document of 7400 series http://download.intel.com/design/xeon/specupdt/32033601.pdf Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-29x86: remove mach_apic.hIngo Molnar
Spread mach_apic.h definitions into genapic.h. (with some knock-on effects on smp.h and apic.h.) Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-28Merge branches 'x86/asm', 'x86/cleanups', 'x86/cpudetect', 'x86/debug', ↵Ingo Molnar
'x86/doc', 'x86/header-fixes', 'x86/mm', 'x86/paravirt', 'x86/pat', 'x86/setup-v2', 'x86/subarch', 'x86/uaccess' and 'x86/urgent' into x86/core
2009-01-26x86: correct the CPUID pattern for MSR_IA32_MISC_ENABLE availabilityH. Peter Anvin
Impact: re-enable CPUID unmasking on affected processors As far as I am capable of discerning from the documentation, MSR_IA32_MISC_ENABLE should be available for all family 0xf CPUs, as well as family 6 for model >= 0xd (newer Pentium M). The documentation on this isn't ideal, so we need to be on the lookout for errors, still. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-01-26x86: unmask CPUID levels on Intel CPUs, fixIngo Molnar
Impact: fix boot hang on pre-model-15 Intel CPUs rdmsrl_safe() does not work in very early bootup code yet, because we dont have the pagefault handler installed yet so exception section does not get parsed. rdmsr_safe() will just crash and hang the bootup. So limit the MSR_IA32_MISC_ENABLE MSR read to those CPU types that support it. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-23x86: handle PAT more like other CPU featuresH. Peter Anvin
Impact: Cleanup When PAT was originally introduced, it was handled specially for a few reasons: - PAT bugs are hard to track down, so we wanted to maintain a whitelist of CPUs. - The i386 and x86-64 CPUID code was not yet unified. Both of these are now obsolete, so handle PAT like any other features, including ordinary feature blacklisting due to known bugs. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2009-01-22x86: unmask CPUID levels on Intel CPUsH. Peter Anvin
Impact: Fixes crashes with misconfigured BIOSes on XSAVE hardware Avuton Olrich reported early boot crashes with v2.6.28 and bisected it down to dc1e35c6e95e8923cf1d3510438b63c600fee1e2 ("x86, xsave: enable xsave/xrstor on cpus with xsave support"). If the CPUID limit bit in MSR_IA32_MISC_ENABLE is set, clear it to make all CPUID information available. This is required for some features to work, in particular XSAVE. Reported-and-bisected-by: Avuton Olrich <avuton@gmail.com> Tested-by: Avuton Olrich <avuton@gmail.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2008-12-25Merge branch 'x86/tsc' into tracing/coreIngo Molnar
Merge it to resolve this incidental conflict between the BTS fixes/cleanups and changes in x86/tsc: Conflicts: arch/x86/kernel/cpu/intel.c
2008-12-23Merge branch 'x86/ptrace' into x86/tscIngo Molnar
Conflicts: arch/x86/kernel/cpu/intel.c
2008-12-19x86: fix intel x86_64 llc_shared_map/cpu_llc_id anomoliesSuresh Siddha
Impact: fix wrong cache sharing detection on platforms supporting > 8 bit apicid's In the presence of extended topology eumeration leaf 0xb provided by cpuid, 32bit extended initial_apicid in cpuinfo_x86 struct will be updated by detect_extended_topology(). At this instance, we should also reinit the apicid (which could also potentially be extended to 32bit). With out this there will potentially be duplicate apicid's populated in the per cpu's cpuinfo_x86 struct, resulting in wrong cache sharing topology etc detected by init_intel_cacheinfo(). Reported-by: Dimitri Sivanich <sivanich@sgi.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Dimitri Sivanich <sivanich@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: <stable@kernel.org>
2008-12-16x86: support always running TSC on Intel CPUsVenki Pallipadi
Impact: reward non-stop TSCs with good TSC-based clocksources, etc. Add support for CPUID_0x80000007_Bit8 on Intel CPUs as well. This bit means that the TSC is invariant with C/P/T states and always runs at constant frequency. With Intel CPUs, we have 3 classes * CPUs where TSC runs at constant rate and does not stop n C-states * CPUs where TSC runs at constant rate, but will stop in deep C-states * CPUs where TSC rate will vary based on P/T-states and TSC will stop in deep C-states. To cover these 3, one feature bit (CONSTANT_TSC) is not enough. So, add a second bit (NONSTOP_TSC). CONSTANT_TSC indicates that the TSC runs at constant frequency irrespective of P/T-states, and NONSTOP_TSC indicates that TSC does not stop in deep C-states. CPUID_0x8000000_Bit8 indicates both these feature bit can be set. We still have CONSTANT_TSC _set_ and NONSTOP_TSC _not_set_ on some older Intel CPUs, based on model checks. We can use TSC on such CPUs for time, as long as those CPUs do not support/enter deep C-states. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-12-12x86, bts: provide in-kernel branch-trace interfaceMarkus Metzger
Impact: cleanup Move the BTS bits from ptrace.c into ds.c. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-11-10x86, bts: DS and BTS initializationMarkus Metzger
Impact: widen BTS/PEBS ptrace enablement to more CPU models Move BTS initialisation out of an #ifdef CONFIG_X86_64 guard. Assume core2 BTS and DS layout for future models of family 6 processors. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-16x86: print out apic id in hex formatYinghai Lu
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-10x86: extended "flags" to show virtualization HW feature in /proc/cpuinfoSheng Yang
The hardware virtualization technology evolves very fast. But currently it's hard to tell if your CPU support a certain kind of HW technology without digging into the source code. The patch add a new catagory in "flags" under /proc/cpuinfo. Now "flags" can indicate the (important) HW virtulization features the CPU supported as well. Current implementation just cover Intel VMX side. Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-10x86: intel.c put workaround for old cpus togetherYinghai Lu
consolidate the code some more. No change in functionality intended. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-10x86: make intel.c have 64-bit support codeYinghai Lu
prepare for unification. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-10Merge branch 'x86/pebs' into x86/unify-cpu-detectIngo Molnar
Conflicts: arch/x86/Kconfig.cpu include/asm-x86/ds.h Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-08x86: little clean up of intel.c/intel_64.cYinghai Lu
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-05Merge branch 'x86/x2apic' into x86/coreIngo Molnar
Conflicts: arch/x86/kernel/cpu/common_64.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-04x86: remove cpu_vendor_devYinghai Lu
1. add c_x86_vendor into cpu_dev 2. change cpu_devs to static 3. check c_x86_vendor before put that cpu_dev into array 4. remove alignment for 64bit 5. order the sequence in cpu_devs according to link sequence... so could put intel at first, then amd... Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-08-23x86: use cpuid vector 0xb when available for detecting cpu topologySuresh Siddha
cpuid leaf 0xb provides extended topology enumeration. This interface provides the 32-bit x2APIC id of the logical processor and it also provides a new mechanism to detect SMT and core siblings (which provides increased addressability). Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-08-18x86: move cmpxchg fallbacks to a generic placeThomas Petazzoni
arch/x86/kernel/cpu/intel.c defines a few fallback functions (cmpxchg_*()) that are used when the CPU doesn't support cmpxchg and/or cmpxchg64 natively. However, while defined in an Intel-specific file, these functions are also used for CPUs from other vendors when they don't support cmpxchg and/or cmpxchg64. This breaks the compilation when support for Intel CPUs is disabled. This patch moves these functions to a new arch/x86/kernel/cpu/cmpxchg.c file, unconditionally compiled when X86_32 is enabled. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: michael@free-electrons.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-08-18x86: make movsl_mask definition non-CPU specificThomas Petazzoni
movsl_mask is currently defined in arch/x86/kernel/cpu/intel.c, which contains code specific to Intel CPUs. However, movsl_mask is used in the non-CPU specific code in arch/x86/lib/usercopy_32.c, which breaks the compilation when support for Intel CPUs is compiled out. This patch solves this problem by moving movsl_mask's definition close to its users in arch/x86/lib/usercopy_32.c. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: michael@free-electrons.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-25Merge branch 'linus' into x86/pebsIngo Molnar
Conflicts: arch/x86/Kconfig.cpu arch/x86/kernel/cpu/intel.c arch/x86/kernel/setup_64.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-18x86: APIC: remove apic_write_around(); use alternativesMaciej W. Rozycki
Use alternatives to select the workaround for the 11AP Pentium erratum for the affected steppings on the fly rather than build time. Remove the X86_GOOD_APIC configuration option and replace all the calls to apic_write_around() with plain apic_write(), protecting accesses to the ESR as appropriate due to the 3AP Pentium erratum. Remove apic_read_around() and all its invocations altogether as not needed. Remove apic_write_atomic() and all its implementing backends. The use of ASM_OUTPUT2() is not strictly needed for input constraints, but I have used it for readability's sake. I had the feeling no one else was brave enough to do it, so I went ahead and here it is. Verified by checking the generated assembly and tested with both a 32-bit and a 64-bit configuration, also with the 11AP "feature" forced on and verified with gdb on /proc/kcore to work as expected (as an 11AP machines are quite hard to get hands on these days). Some script complained about the use of "volatile", but apic_write() needs it for the same reason and is effectively a replacement for writel(), so I have disregarded it. I am not sure what the policy wrt defconfig files is, they are generated and there is risk of a conflict resulting from an unrelated change, so I have left changes to them out. The option will get removed from them at the next run. Some testing with machines other than mine will be needed to avoid some stupid mistake, but despite its volume, the change is not really that intrusive, so I am fairly confident that because it works for me, it will everywhere. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-13x86: fix numaq_tsc_disable callingYinghai Lu
got this on a test-system: calling numaq_tsc_disable+0x0/0x39 NUMAQ: disabling TSC initcall numaq_tsc_disable+0x0/0x39 returned 0 after 0 msecs that's because we should not be using arch_initcall to call numaq_tsc_disable. need to call it in setup_arch before time_init()/tsc_init() and call it in init_intel() to make the cpu feature bits right. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-05-12x86, ptrace: PEBS supportMarkus Metzger
Polish the ds.h interface and add support for PEBS. Ds.c is meant to be the resource allocator for per-thread and per-cpu BTS and PEBS recording. It is used by ptrace/utrace to provide execution tracing of debugged tasks. It will be used by profilers (e.g. perfmon2). It may be used by kernel debuggers to provide a kernel execution trace. Changes in detail: - guard DS and ptrace by CONFIG macros - separate DS and BTS more clearly - simplify field accesses - add functions to manage PEBS buffers - add simple protection/allocation mechanism - added support for Atom Opens: - buffer overflow handling Currently, only circular buffers are supported. This is all we need for debugging. Profilers would want an overflow notification. This is planned to be added when perfmon2 is made to use the ds.h interface. - utrace intermediate layer Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-04-17x86: clean up cpu capabilities in arch/x86/kernel/cpu/intel.cIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-17x86: coding style fixes to arch/x86/kernel/cpu/intel.cPaolo Ciarrocchi
Before: total: 37 errors, 16 warnings, 366 lines checked After: total: 0 errors, 15 warnings, 369 lines checked No code changed: arch/x86/kernel/cpu/intel.o: text data bss dec hex filename 1534 452 0 1986 7c2 intel.o.before 1534 452 0 1986 7c2 intel.o.after md5: 1ca348a06de6eb354c4b6ea715a57db5 intel.o.before.asm 1ca348a06de6eb354c4b6ea715a57db5 intel.o.after.asm Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-17x86: use ELF section to list CPU vendor specific codeThomas Petazzoni
Replace the hardcoded list of initialization functions for each CPU vendor by a list in an ELF section, which is read at initialization in arch/x86/kernel/cpu/cpu.c to fill the cpu_devs[] array. The ELF section, named .x86cpuvendor.init, is reclaimed after boot, and contains entries of type "struct cpu_vendor_dev" which associates a vendor number with a pointer to a "struct cpu_dev" structure. This first modification allows to remove all the VENDOR_init_cpu() functions. This patch also removes the hardcoded calls to early_init_amd() and early_init_intel(). Instead, we add a "c_early_init" member to the cpu_dev structure, which is then called if not NULL by the generic CPU initialization code. Unfortunately, in early_cpu_detect(), this_cpu is not yet set, so we have to use the cpu_devs[] array directly. This patch is part of the Linux Tiny project, and is needed for further patch that will allow to disable compilation of unused CPU support code. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-02-04x86: add include to cpu/intel.cHarvey Harrison
Fixes sparse warning: arch/x86/kernel/cpu/intel.c:48:15: warning: symbol 'ppro_with_ram_bug' was not declared. Should it be static? Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: move MWAIT idle check to generic CPU initialization on 32-bitAndi Kleen
Previously it was only run for Intel CPUs, but AMD Fam10h implements MWAIT too. This matches 64bit behaviour. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: move X86_FEATURE_CONSTANT_TSC into early cpu feature detectionAndi Kleen
Need this in the next patch in time_init and that happens early. This includes a minor fix on i386 where early_intel_workarounds() [which is now called early_init_intel] really executes early as the comments say. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: lfence fixIngo Molnar
LFENCE is available on XMM2 or higher Intel CPUs - not XMM or higher... this caused boot failures on XMM1 & !XMM1 capable CPUs. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: Implement support to synchronize RDTSC with LFENCE on Intel CPUsAndi Kleen
According to Intel RDTSC can be always synchronized with LFENCE on all current CPUs. Implement the necessary CPUID bit for that. It is unclear yet if that is true for all future CPUs too, but if there's another way the kernel can be always updated. Cc: asit.k.mallick@intel.com Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-26 20:40:35 +0000