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* hw-breakpoints: Use struct perf_event_attr to define user breakpointsFrederic Weisbecker2009-11-27
| | | | | | | | | | | | | | | | | In-kernel user breakpoints are created using functions in which we pass breakpoint parameters as individual variables: address, length and type. Although it fits well for x86, this just does not scale across archictectures that may support this api later as these may have more or different needs. Pass in a perf_event_attr structure instead because it is meant to evolve as much as possible into a generic hardware breakpoint parameter structure. Reported-by: K.Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1259294154-5197-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86/hw-breakpoints: Don't lose GE flag while disabling a breakpointFrederic Weisbecker2009-11-26
| | | | | | | | | | | | | | When we schedule out a breakpoint from the cpu, we also incidentally remove the "Global exact breakpoint" flag from the breakpoint control register. It makes us losing the fine grained precision about the origin of the instructions that may trigger breakpoint exceptions for the other breakpoints running in this cpu. Reported-by: Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1259211878-6013-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* hw-breakpoints: Simplify error handling in breakpoint creation requestsFrederic Weisbecker2009-11-26
| | | | | | | | | | | | | | | | This simplifies the error handling when we create a breakpoint. We don't need to check the NULL return value corner case anymore since we have improved perf_event_create_kernel_counter() to always return an error code in the failure case. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Prasad <prasad@linux.vnet.ibm.com> LKML-Reference: <1259210142-5714-3-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: Rename global percpu symbol dr7 to cpu_dr7Tejun Heo2009-11-25
| | | | | | | | | | | | | | | | | | | | | Percpu symbols now occupy the same namespace as other global symbols and as such short global symbols without subsystem prefix tend to collide with local variables. dr7 percpu variable used by x86 was hit by this. Rename it to cpu_dr7. The rename also makes it more consistent with its fellow cpu_debugreg percpu variable. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org>, Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <20091125115856.GA17856@elte.hu> Signed-off-by: Ingo Molnar <mingo@elte.hu> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
* perf_events, x86: Fix validate_event bugStephane Eranian2009-11-24
| | | | | | | | | | | | | | | | | | | | | | | The validate_event() was failing on valid event combinations. The function was assuming that if x86_schedule_event() returned 0, it meant error. But x86_schedule_event() returns the counter index and 0 is a perfectly valid value. An error is returned if the function returns a negative value. Furthermore, validate_event() was also failing for event groups because the event->pmu was not set until after hw_perf_event_init(). Signed-off-by: Stephane Eranian <eranian@google.com> Cc: peterz@infradead.org Cc: paulus@samba.org Cc: perfmon2-devel@lists.sourceforge.net Cc: eranian@gmail.com LKML-Reference: <4b0bdf36.1818d00a.07cc.25ae@mx.google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> -- arch/x86/kernel/cpu/perf_event.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
* hw-breakpoint: Attribute authorship of hw-breakpoint related filesK.Prasad2009-11-23
| | | | | | | | | | | | Attribute authorship to developers of hw-breakpoint related files. Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091123154713.GA5593@in.ibm.com> [ v2: moved it to latest -tip ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
* perf events: Do not generate function trace entries in perf codeIngo Molnar2009-11-23
| | | | | | | | | | | | | Decreases perf overhead when function tracing is enabled, by about 50%. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Merge branch 'tracing/hw-breakpoints' into perf/coreIngo Molnar2009-11-21
|\ | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/x86/kernel/kprobes.c kernel/trace/Makefile Merge reason: hw-breakpoints perf integration is looking good in testing and in reviews, plus conflicts are mounting up - so merge & resolve. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * hw-breakpoints, x86: Fix modular KVM buildIngo Molnar2009-11-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This build error: arch/x86/kvm/x86.c:3655: error: implicit declaration of function 'hw_breakpoint_restore' Happens because in the CONFIG_KVM=m case there's no 'CONFIG_KVM' define in the kernel - it's CONFIG_KVM_MODULE in that case. Make the prototype available unconditionally. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Prasad <prasad@linux.vnet.ibm.com> LKML-Reference: <1258114575-32655-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * hw-breakpoints: Wrap in the KVM breakpoint active state checkFrederic Weisbecker2009-11-10
| | | | | | | | | | | | | | | | | | | | | | | | | | Wrap in the cpu dr7 check that tells if we have active breakpoints that need to be restored in the cpu. This wrapper makes the check more self-explainable and also reusable for any further other uses. Reported-by: Jan Kiszka <jan.kiszka@web.de> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Avi Kivity <avi@redhat.com> Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
| * hw-breakpoints: Fix broken a.out format dumpFrederic Weisbecker2009-11-10
| | | | | | | | | | | | | | | | | | | | | | | | Fix the broken a.out format dump. For now we only dump the ptrace breakpoints. TODO: Dump every perf breakpoints for the current thread, not only ptrace based ones. Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
| * hw-breakpoints: Rewrite the hw-breakpoints layer on top of perf eventsFrederic Weisbecker2009-11-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch rebase the implementation of the breakpoints API on top of perf events instances. Each breakpoints are now perf events that handle the register scheduling, thread/cpu attachment, etc.. The new layering is now made as follows: ptrace kgdb ftrace perf syscall \ | / / \ | / / / Core breakpoint API / / | / | / Breakpoints perf events | | Breakpoints PMU ---- Debug Register constraints handling (Part of core breakpoint API) | | Hardware debug registers Reasons of this rewrite: - Use the centralized/optimized pmu registers scheduling, implying an easier arch integration - More powerful register handling: perf attributes (pinned/flexible events, exclusive/non-exclusive, tunable period, etc...) Impact: - New perf ABI: the hardware breakpoints counters - Ptrace breakpoints setting remains tricky and still needs some per thread breakpoints references. Todo (in the order): - Support breakpoints perf counter events for perf tools (ie: implement perf_bpcounter_event()) - Support from perf tools Changes in v2: - Follow the perf "event " rename - The ptrace regression have been fixed (ptrace breakpoint perf events weren't released when a task ended) - Drop the struct hw_breakpoint and store generic fields in perf_event_attr. - Separate core and arch specific headers, drop asm-generic/hw_breakpoint.h and create linux/hw_breakpoint.h - Use new generic len/type for breakpoint - Handle off case: when breakpoints api is not supported by an arch Changes in v3: - Fix broken CONFIG_KVM, we need to propagate the breakpoint api changes to kvm when we exit the guest and restore the bp registers to the host. Changes in v4: - Drop the hw_breakpoint_restore() stub as it is only used by KVM - EXPORT_SYMBOL_GPL hw_breakpoint_restore() as KVM can be built as a module - Restore the breakpoints unconditionally on kvm guest exit: TIF_DEBUG_THREAD doesn't anymore cover every cases of running breakpoints and vcpu->arch.switch_db_regs might not always be set when the guest used debug registers. (Waiting for a reliable optimization) Changes in v5: - Split-up the asm-generic/hw-breakpoint.h moving to linux/hw_breakpoint.h into a separate patch - Optimize the breakpoints restoring while switching from kvm guest to host. We only want to restore the state if we have active breakpoints to the host, otherwise we don't care about messed-up address registers. - Add asm/hw_breakpoint.h to Kbuild - Fix bad breakpoint type in trace_selftest.c Changes in v6: - Fix wrong header inclusion in trace.h (triggered a build error with CONFIG_FTRACE_SELFTEST Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Prasad <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jan Kiszka <jan.kiszka@web.de> Cc: Jiri Slaby <jirislaby@gmail.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Avi Kivity <avi@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Paul Mundt <lethal@linux-sh.org>
| * hw-breakpoint: Move asm-generic/hw_breakpoint.h to linux/hw_breakpoint.hFrederic Weisbecker2009-11-05
| | | | | | | | | | | | | | | | We plan to make the breakpoints parameters generic among architectures. For that it's better to move the asm-generic header to a generic linux header. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * x86/hw-breakpoints: Actually flush thread breakpoints in flush_thread().Paul Mundt2009-11-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | flush_thread() tries to do a TIF_DEBUG check before calling in to flush_thread_hw_breakpoint() (which subsequently clears the thread flag), but for some reason, the x86 code is manually clearing TIF_DEBUG immediately before the test, so this path will never be taken. This kills off the erroneous clear_tsk_thread_flag() and lets flush_thread_hw_breakpoint() actually get invoked. Presumably folks were getting lucky with testing and the free_thread_info() -> free_thread_xstate() path was taking care of the flush there. Signed-off-by: Paul Mundt <lethal@linux-sh.org> Acked-by: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Alan Stern <stern@rowland.harvard.edu> LKML-Reference: <20091005102306.GA7889@linux-sh.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * Merge commit 'perf/core' into perf/hw-breakpointFrederic Weisbecker2009-10-17
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: kernel/Makefile kernel/trace/Makefile kernel/trace/trace.h samples/Makefile Merge reason: We need to be uptodate with the perf events development branch because we plan to rewrite the breakpoints API on top of perf events.
| * \ Merge branch 'linus' into tracing/hw-breakpointsIngo Molnar2009-09-15
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/x86/kernel/process_64.c Semantic conflict fixed in: arch/x86/kvm/x86.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * \ \ Merge branch 'tracing/core' into tracing/hw-breakpointsIngo Molnar2009-09-07
| |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/Kconfig kernel/trace/trace.h Merge reason: resolve the conflicts, plus adopt to the new ring-buffer APIs. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | x86: Mark ptrace_get_debugreg() as staticJaswinder Singh Rajput2009-07-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This sparse warning: arch/x86/kernel/ptrace.c:560:15: warning: symbol 'ptrace_get_debugreg' was not declared. Should it be static? triggers because ptrace_get_debugreg() is global but is only used in a single .c file. change ptrace_get_debugreg() to static to fix that - this also addresses the sparse warning. Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1246458150.6940.19.camel@hpdv5.satnam> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | x86: hw_breakpoint.c arch_check_va_in_kernelspace and hw_breakpoint_handler ↵Jaswinder Singh Rajput2009-06-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | should be static arch_check_va_in_kernelspace() and hw_breakpoint_handler() is used only by same file so it should be static. Also fixed non-ANSI function declaration of function 'arch_uninstall_thread_hw_breakpoint' Fixed following sparse warnings : arch/x86/kernel/hw_breakpoint.c:124:42: warning: non-ANSI function declaration of function 'arch_uninstall_thread_hw_breakpoint' arch/x86/kernel/hw_breakpoint.c:169:5: warning: symbol 'arch_check_va_in_kernelspace' was not declared. Should it be static? arch/x86/kernel/hw_breakpoint.c:313:15: warning: symbol 'hw_breakpoint_handler' was not declared. Should it be static? Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: "K.Prasad" <prasad@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1245230059.2662.4.camel@ht.satnam> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | Merge branch 'linus' into tracing/hw-breakpointsIngo Molnar2009-06-17
| |\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/x86/Kconfig arch/x86/kernel/traps.c arch/x86/power/cpu.c arch/x86/power/cpu_32.c kernel/Makefile Semantic conflict: arch/x86/kernel/hw_breakpoint.c Merge reason: Resolve the conflicts, move from put_cpu_no_sched() to put_cpu() in arch/x86/kernel/hw_breakpoint.c. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | | hw-breakpoints: reset bits in dr6 after the corresponding exception is handledK.Prasad2009-06-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch resets the bit in dr6 after the corresponding exception is handled in code, so that we keep a clean track of the current virtual debug status register. [ Impact: keep track of breakpoints triggering completion ] Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * | | | | hw-breakpoints: cleanup HW Breakpoint registers before kexecK.Prasad2009-06-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch disables Hardware breakpoints before doing a 'kexec' on the machine so that the cpu doesn't keep debug registers values which would be out of sync for the new image. Original-patch-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * | | | | hw-breakpoints: modify Ptrace routines to access breakpoint registersK.Prasad2009-06-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch modifies the ptrace code to use the new wrapper routines around the debug/breakpoint registers. [ Impact: adapt x86 ptrace to the new breakpoint Api ] Original-patch-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: Maneesh Soni <maneesh@linux.vnet.ibm.com> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * | | | | hw-breakpoints: modify signal handling code to refrain from re-enabling HW ↵K.Prasad2009-06-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Breakpoints This patch disables re-enabling of Hardware Breakpoint registers through the signal handling code. This is now done during from hw_breakpoint_handler(). Original-patch-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * | | | | hw-breakpoints: use the new wrapper routines to access debug registers in ↵K.Prasad2009-06-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | process/thread code This patch enables the use of abstract debug registers in process-handling routines, according to the new hardware breakpoint Api. [ Impact: adapt thread breakpoints handling code to the new breakpoint Api ] Original-patch-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * | | | | hw-breakpoints: use wrapper routines around debug registers in processor ↵K.Prasad2009-06-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | related functions This patch enables the use of wrapper routines to access the debug/breakpoint registers on cpu management. The hardcoded debug registers save and restore operations for threads breakpoints are replaced by wrappers. And now that we handle the kernel breakpoints too, we also need to handle them on cpu hotplug operations. [ Impact: adapt new hardware breakpoint api to cpu hotplug ] Original-patch-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * | | | | hw-breakpoints: modifying generic debug exception to use thread-specific ↵K.Prasad2009-06-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | debug registers This patch modifies the breakpoint exception handler code to use the new abstract debug register names. [ fweisbec@gmail.com: fix conflict against kmemcheck ] [ Impact: refactor and cleanup x86 debug exception handler ] Original-patch-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * | | | | hw-breakpoints: x86 architecture implementation of Hardware Breakpoint ↵K.Prasad2009-06-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | interfaces This patch introduces the arch-specific implementation of the generic hardware breakpoints in kernel/hw_breakpoint.c inside x86 specific directories. It contains functions which help to validate and serve requests using Hardware Breakpoint registers on x86 processors. [ fweisbec@gmail.com: fix conflict against kmemcheck ] Original-patch-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
| * | | | | hw-breakpoints: prepare the code for Hardware Breakpoint interfacesK.Prasad2009-06-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The generic hardware breakpoint interface provides an abstraction of hardware breakpoints in front of specific arch implementations for both kernel and user side breakpoints. This includes execution breakpoints and read/write breakpoints, also known as "watchpoints". This patch introduces header files containing constants, structure definitions and declaration of functions used by the hardware breakpoint core and x86 specific code. It also introduces an array based storage for the debug-register values in 'struct thread_struct', while modifying all users of debugreg<n> member in the structure. [ Impact: add headers for new hardware breakpoint interface ] Original-patch-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com> Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
* | | | | | x86: Instruction decoder test should generate build warningMasami Hiramatsu2009-11-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since some instructions are not decoded correctly by older versions of objdump, it may cause false positive error in insn decoder posttest. This changes build error of insn decoder test to build warning. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> LKML-Reference: <20091116230631.5250.41579.stgit@harusame> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | | | | | Merge branch 'perf/core' into perf/probesIngo Molnar2009-11-17
|\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Resolved merge conflict in tools/perf/Makefile Merge reason: we want to queue up a dependent patch. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * \ \ \ \ \ Merge commit 'v2.6.32-rc7' into perf/coreIngo Molnar2009-11-15
| |\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Merge reason: pick up perf fixlets Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * \ \ \ \ \ Merge branch 'for-linus' of ↵Linus Torvalds2009-11-11
| | |\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: x86/PCI: Adjust GFP mask handling for coherent allocations PCI ASPM: fix oops on root port removal
| | | * | | | | | x86/PCI: Adjust GFP mask handling for coherent allocationsJan Beulich2009-11-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rather than forcing GFP flags and DMA mask to be inconsistent, GFP flags should be determined even for the fallback device through dma_alloc_coherent_mask()/dma_alloc_coherent_gfp_flags(). This restores 64-bit behavior as it was prior to commits 8965eb19386fdf5ccd0ef8b02593eb8560aa3416 and 4a367f3a9dbf2e7ffcee4702203479809236ee6e (not sure why there are two of them), where GFP_DMA was forced on for 32-bit, but not for 64-bit, with the slight adjustment that afaict even 32-bit doesn't need this without CONFIG_ISA. Signed-off-by: Jan Beulich <jbeulich@novell.com> Acked-by: Takashi Iwai <tiwai@suse.de> LKML-Reference: <4AF18187020000780001D8AA@vpn.id2.novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
| | * | | | | | | Merge branch 'x86-fixes-for-linus' of ↵Linus Torvalds2009-11-11
| | |\ \ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, amd-ucode: Check UCODE_MAGIC before loading the container file x86: Fix error return sequence in __ioremap_caller() x86: Add Phoenix/MSC BIOSes to lowmem corruption list
| | | * | | | | | | x86, amd-ucode: Check UCODE_MAGIC before loading the container fileBorislav Petkov2009-11-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> LKML-Reference: <20091029134552.GC30802@alberich.amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | | * | | | | | | x86: Fix error return sequence in __ioremap_caller()Xiaotian Feng2009-11-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | kernel missed to free memtype if get_vm_area_caller failed in __ioremap_caller. This patch introduces error path to fix this and cleans up the repetitive error return sequences that contributed to the creation of the bug. Signed-off-by: Xiaotian Feng <dfeng@redhat.com> Acked-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> LKML-Reference: <1257389031-20429-1-git-send-email-dfeng@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | | * | | | | | | x86: Add Phoenix/MSC BIOSes to lowmem corruption listSimon Kagstrom2009-11-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We have a board with a Phoenix/MSC BIOS which also corrupts the low 64KB of RAM, so add an entry to the table. Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net> LKML-Reference: <20091106154404.002648d9@marrow.netinsight.se> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| | * | | | | | | | Merge branch 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds2009-11-05
| | |\ \ \ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: get_tss_base_addr() should return a gpa_t KVM: x86: Catch potential overrun in MCE setup
| | | * | | | | | | | KVM: get_tss_base_addr() should return a gpa_tGleb Natapov2009-11-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If TSS we are switching to resides in high memory task switch will fail since address will be truncated. Windows2k3 does this sometimes when running with more then 4G Cc: stable@kernel.org Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
| | | * | | | | | | | KVM: x86: Catch potential overrun in MCE setupJan Kiszka2009-11-04
| | | | |/ / / / / / | | | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We only allocate memory for 32 MCE banks (KVM_MAX_MCE_BANKS) but we allow user space to fill up to 255 on setup (mcg_cap & 0xff), corrupting kernel memory. Catch these overflows. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
| | * | | | | | | | x86: Make sure get_user_desc() doesn't sign extend.Chris Lalancette2009-11-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current implementation of get_user_desc() sign extends the return value because of integer promotion rules. For the most part, this doesn't matter, because the top bit of base2 is usually 0. If, however, that bit is 1, then the entire value will be 0xffff... which is probably not what the caller intended. This patch casts the entire thing to unsigned before returning, which generates almost the same assembly as the current code but replaces the final "cltq" (sign extend) with a "mov %eax %eax" (zero-extend). This fixes booting certain guests under KVM. Signed-off-by: Chris Lalancette <clalance@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| | * | | | | | | | Merge branch 'bugfix' of ↵Linus Torvalds2009-11-05
| | |\ \ \ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen * 'bugfix' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen: xen: mask extended topology info in cpuid xen/hvc: make sure console output is always emitted, with explicit polling
| | | * | | | | | | | xen: mask extended topology info in cpuidJeremy Fitzhardinge2009-11-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A Xen guest never needs to know about extended topology, and knowing would just confuse it. This patch just zeros ebx in leaf 0xb which indicates no topology info, preventing a crash under Xen on cpus which support this leaf. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stable Kernel <stable@kernel.org>
| | * | | | | | | | | Merge branch 'sched-fixes-for-linus' of ↵Linus Torvalds2009-11-05
| | |\ \ \ \ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sched: Fix kthread_bind() by moving the body of kthread_bind() to sched.c sched: Disable SD_PREFER_LOCAL at node level sched: Fix boot crash by zalloc()ing most of the cpu masks sched: Strengthen buddies and mitigate buddy induced latencies
| | | * | | | | | | | | sched: Disable SD_PREFER_LOCAL at node levelMike Galbraith2009-11-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Yanmin Zhang reported that SD_PREFER_LOCAL induces an order of magnitude increase in select_task_rq_fair() overhead while running heavy wakeup benchmarks (tbench and vmark). Since SD_BALANCE_WAKE is off at node level, turn SD_PREFER_LOCAL off as well pending further investigation. Reported-by: Zhang, Yanmin <yanmin_zhang@linux.intel.com> Signed-off-by: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | | | | | | | | Merge branch 'x86-fixes-for-linus' of ↵Linus Torvalds2009-11-05
| | |\ \ \ \ \ \ \ \ \ \ | | | |_|_|/ / / / / / / | | |/| | | / / / / / / | | | | |_|/ / / / / / | | | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, fs: Fix x86 procfs stack information for threads on 64-bit x86: Add reboot quirk for 3 series Mac mini x86: Fix printk message typo in mtrr cleanup code dma-debug: Fix compile warning with PAE enabled x86/amd-iommu: Un__init function required on shutdown x86/amd-iommu: Workaround for erratum 63
| | | * | | | | | | | x86, fs: Fix x86 procfs stack information for threads on 64-bitStefani Seibold2009-11-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes two issues in the procfs stack information on x86-64 linux. The 32 bit loader compat_do_execve did not store stack start. (this was figured out by Alexey Dobriyan). The stack information on a x64_64 kernel always shows 0 kbyte stack usage, because of a missing implementation of the KSTK_ESP macro which always returned -1. The new implementation now returns the right value. Signed-off-by: Stefani Seibold <stefani@seibold.net> Cc: Americo Wang <xiyou.wangcong@gmail.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <1257240160.4889.24.camel@wall-e> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | | * | | | | | | | Merge branch 'iommu/fixes' of ↵Ingo Molnar2009-11-03
| | | |\ \ \ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into x86/urgent
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| | | | *-. \ \ \ \ \ \ \ Merge branches 'amd-iommu/fixes' and 'dma-debug/fixes' into iommu/fixesJoerg Roedel2009-11-03
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