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  1. 19 5月, 2015 8 次提交
    • I
      x86/fpu: Optimize fpu__unlazy_stopped() · 8694c3e7
      由 Ingo Molnar 提交于 
      This function is only called for stopped child tasks, so the
fpu__save() branch will never get called - remove it.
Reviewed-by: NBorislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
      8694c3e7
    • I
      x86/fpu: Rename init_fpu() to fpu__unlazy_stopped() and add debugging check · 67e97fc2
      由 Ingo Molnar 提交于 
      This function name is a misnomer now that we've split out all the
other users from it. Rename it accordingly: it's used to save
the FPU state of (ptrace-)stopped child tasks.

Add debugging check to double check this intended usage: that this
function is only called for non-current, stopped child tasks.
Reviewed-by: NBorislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
      67e97fc2
    • I
      x86/fpu: Make init_fpu() static · bda28379
      由 Ingo Molnar 提交于 
      Now that the allocation users have been split off into a separate
function, init_fpu() has become local to i387.c: make it static.
Reviewed-by: NBorislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
      bda28379
    • I
      x86/fpu: Split an fpstate_alloc_init() function out of init_fpu() · 97185c95
      由 Ingo Molnar 提交于 
      Most init_fpu() users don't want the register-saving aspect of the
function, they are calling it for 'current' and when FPU registers
are not allocated and initialized yet.

Split out a simplified API that does just that (and add debug-checks
for these conditions): fpstate_alloc_init().

Use it where appropriate.
Reviewed-by: NBorislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
      97185c95
    • I
      x86/fpu: Rename fpu_detect() to fpu__detect() · 1a7dc0db
      由 Ingo Molnar 提交于 
      Use the fpu__*() namespace to organize FPU ops better.

Also document fpu__detect() a bit.
Reviewed-by: NBorislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
      1a7dc0db
    • I
      x86/fpu: Add debugging check to fpu__save() · 87cdb98a
      由 Ingo Molnar 提交于 
      Document the function a bit more and add debugging check that we are only
running this with the current task.
Reviewed-by: NBorislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
      87cdb98a
    • I
      x86/fpu: Add comments to fpu__save() and restrict its export · 4af08f2f
      由 Ingo Molnar 提交于 
      Add an explanation to fpu__save() and also don't export it to
random modules - we don't want them to futz around with deep kernel
internals.
Reviewed-by: NBorislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
      4af08f2f
    • I
      x86/fpu: Rename unlazy_fpu() to fpu__save() · 0a781551
      由 Ingo Molnar 提交于 
      This function is a misnomer on two levels:

1) it doesn't really manipulate TS on modern CPUs anymore, its
   primary purpose is to save FPU state, used:

      - when executing fork()/clone(): to copy current FPU state
        to the child's FPU state.

      - when handling math exceptions: to generate the math error
        si_code in the signal frame.

2) even on legacy CPUs it doesn't actually 'unlazy', if then
   it lazies the FPU state: as a side effect of the old FNSAVE
   instruction which clears (destroys) FPU state it's necessary
   to set CR0::TS.

So rename it to fpu__save() to better reflect its purpose.
Reviewed-by: NBorislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
      0a781551
  3. 11 5月, 2015 1 次提交
    • S
      perf/x86/rapl: Enable Broadwell-U RAPL support · 44b11fee
      由 Stephane Eranian 提交于 
      This patch enables RAPL counters (energy consumption counters)
support for Intel Broadwell-U processors (Model 61):

To use:

  $ perf stat -a -I 1000 -e power/energy-cores/,power/energy-pkg/,power/energy-ram/ sleep 10
Signed-off-by: NStephane Eranian <eranian@google.com>
Cc: <stable@vger.kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: jacob.jun.pan@linux.intel.com
Cc: kan.liang@intel.com
Cc: peterz@infradead.org
Cc: sonnyrao@chromium.org
Link: http://lkml.kernel.org/r/20150423070709.GA4970@thinkpadSigned-off-by: NIngo Molnar <mingo@kernel.org>
      44b11fee
  5. 08 5月, 2015 1 次提交
  7. 06 5月, 2015 3 次提交
  9. 27 4月, 2015 2 次提交
  11. 22 4月, 2015 3 次提交
    • S
      perf/x86/intel/uncore: Move PCI IDs for IMC to uncore driver · 0140e614
      由 Sonny Rao 提交于 
      This keeps all the related PCI IDs together in the driver where
they are used.
Signed-off-by: NSonny Rao <sonnyrao@chromium.org>
Acked-by: NBjorn Helgaas <bhelgaas@google.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1429644791-25724-1-git-send-email-sonnyrao@chromium.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
      0140e614
    • S
      perf/x86/intel/uncore: Add support for Intel Haswell ULT (lower power Mobile... · 80bcffb3
      由 Sonny Rao 提交于 
      perf/x86/intel/uncore: Add support for Intel Haswell ULT (lower power Mobile Processor) IMC uncore PMUs

This uncore is the same as the Haswell desktop part but uses a
different PCI ID.
Signed-off-by: NSonny Rao <sonnyrao@chromium.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1429569247-16697-1-git-send-email-sonnyrao@chromium.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
      80bcffb3
    • J
      perf/x86/intel: Add cpu_(prepare|starting|dying) for core_pmu · 3b6e0421
      由 Jiri Olsa 提交于 
      The core_pmu does not define cpu_* callbacks, which handles
allocation of 'struct cpu_hw_events::shared_regs' data,
initialization of debug store and PMU_FL_EXCL_CNTRS counters.

While this probably won't happen on bare metal, virtual CPU can
define x86_pmu.extra_regs together with PMU version 1 and thus
be using core_pmu -> using shared_regs data without it being
allocated. That could could leave to following panic:

	BUG: unable to handle kernel NULL pointer dereference at (null)
	IP: [<ffffffff8152cd4f>] _spin_lock_irqsave+0x1f/0x40

	SNIP

	 [<ffffffff81024bd9>] __intel_shared_reg_get_constraints+0x69/0x1e0
	 [<ffffffff81024deb>] intel_get_event_constraints+0x9b/0x180
	 [<ffffffff8101e815>] x86_schedule_events+0x75/0x1d0
	 [<ffffffff810586dc>] ? check_preempt_curr+0x7c/0x90
	 [<ffffffff810649fe>] ? try_to_wake_up+0x24e/0x3e0
	 [<ffffffff81064ba2>] ? default_wake_function+0x12/0x20
	 [<ffffffff8109eb16>] ? autoremove_wake_function+0x16/0x40
	 [<ffffffff810577e9>] ? __wake_up_common+0x59/0x90
	 [<ffffffff811a9517>] ? __d_lookup+0xa7/0x150
	 [<ffffffff8119db5f>] ? do_lookup+0x9f/0x230
	 [<ffffffff811a993a>] ? dput+0x9a/0x150
	 [<ffffffff8119c8f5>] ? path_to_nameidata+0x25/0x60
	 [<ffffffff8119e90a>] ? __link_path_walk+0x7da/0x1000
	 [<ffffffff8101d8f9>] ? x86_pmu_add+0xb9/0x170
	 [<ffffffff8101d7a7>] x86_pmu_commit_txn+0x67/0xc0
	 [<ffffffff811b07b0>] ? mntput_no_expire+0x30/0x110
	 [<ffffffff8119c731>] ? path_put+0x31/0x40
	 [<ffffffff8107c297>] ? current_fs_time+0x27/0x30
	 [<ffffffff8117d170>] ? mem_cgroup_get_reclaim_stat_from_page+0x20/0x70
	 [<ffffffff8111b7aa>] group_sched_in+0x13a/0x170
	 [<ffffffff81014a29>] ? sched_clock+0x9/0x10
	 [<ffffffff8111bac8>] ctx_sched_in+0x2e8/0x330
	 [<ffffffff8111bb7b>] perf_event_sched_in+0x6b/0xb0
	 [<ffffffff8111bc36>] perf_event_context_sched_in+0x76/0xc0
	 [<ffffffff8111eb3b>] perf_event_comm+0x1bb/0x2e0
	 [<ffffffff81195ee9>] set_task_comm+0x69/0x80
	 [<ffffffff81195fe1>] setup_new_exec+0xe1/0x2e0
	 [<ffffffff811ea68e>] load_elf_binary+0x3ce/0x1ab0

Adding cpu_(prepare|starting|dying) for core_pmu to have
shared_regs data allocated for core_pmu. AFAICS there's no harm
to initialize debug store and PMU_FL_EXCL_CNTRS either for
core_pmu.
Signed-off-by: NJiri Olsa <jolsa@kernel.org>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20150421152623.GC13169@krava.redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      3b6e0421
  13. 18 4月, 2015 1 次提交
  15. 17 4月, 2015 5 次提交
  17. 16 4月, 2015 2 次提交
    • O
      x86/ptrace: Fix the TIF_FORCED_TF logic in handle_signal() · fd0f86b6
      由 Oleg Nesterov 提交于 
      When the TIF_SINGLESTEP tracee dequeues a signal,
handle_signal() clears TIF_FORCED_TF and X86_EFLAGS_TF but
leaves TIF_SINGLESTEP set.

If the tracer does PTRACE_SINGLESTEP again, enable_single_step()
sets X86_EFLAGS_TF but not TIF_FORCED_TF.  This means that the
subsequent PTRACE_CONT doesn't not clear X86_EFLAGS_TF, and the
tracee gets the wrong SIGTRAP.

Test-case (needs -O2 to avoid prologue insns in signal handler):

	#include <unistd.h>
	#include <stdio.h>
	#include <sys/ptrace.h>
	#include <sys/wait.h>
	#include <sys/user.h>
	#include <assert.h>
	#include <stddef.h>

	void handler(int n)
	{
		asm("nop");
	}

	int child(void)
	{
		assert(ptrace(PTRACE_TRACEME, 0,0,0) == 0);
		signal(SIGALRM, handler);
		kill(getpid(), SIGALRM);
		return 0x23;
	}

	void *getip(int pid)
	{
		return (void*)ptrace(PTRACE_PEEKUSER, pid,
					offsetof(struct user, regs.rip), 0);
	}

	int main(void)
	{
		int pid, status;

		pid = fork();
		if (!pid)
			return child();

		assert(wait(&status) == pid);
		assert(WIFSTOPPED(status) && WSTOPSIG(status) == SIGALRM);

		assert(ptrace(PTRACE_SINGLESTEP, pid, 0, SIGALRM) == 0);
		assert(wait(&status) == pid);
		assert(WIFSTOPPED(status) && WSTOPSIG(status) == SIGTRAP);
		assert((getip(pid) - (void*)handler) == 0);

		assert(ptrace(PTRACE_SINGLESTEP, pid, 0, SIGALRM) == 0);
		assert(wait(&status) == pid);
		assert(WIFSTOPPED(status) && WSTOPSIG(status) == SIGTRAP);
		assert((getip(pid) - (void*)handler) == 1);

		assert(ptrace(PTRACE_CONT, pid, 0,0) == 0);
		assert(wait(&status) == pid);
		assert(WIFEXITED(status) && WEXITSTATUS(status) == 0x23);

		return 0;
	}

The last assert() fails because PTRACE_CONT wrongly triggers
another single-step and X86_EFLAGS_TF can't be cleared by
debugger until the tracee does sys_rt_sigreturn().

Change handle_signal() to do user_disable_single_step() if
stepping, we do not need to preserve TIF_SINGLESTEP because we
are going to do ptrace_notify(), and it is simply wrong to leak
this bit.

While at it, change the comment to explain why we also need to
clear TF unconditionally after setup_rt_frame().

Note: in the longer term we should probably change
setup_sigcontext() to use get_flags() and then just remove this
user_disable_single_step().  And, the state of TIF_FORCED_TF can
be wrong after restore_sigcontext() which can set/clear TF, this
needs another fix.

This fix fixes the 'single_step_syscall_32' testcase in
the x86 testsuite:

Before:

	~/linux/tools/testing/selftests/x86> ./single_step_syscall_32
	[RUN]   Set TF and check nop
	[OK]    Survived with TF set and 9 traps
	[RUN]   Set TF and check int80
	[OK]    Survived with TF set and 9 traps
	[RUN]   Set TF and check a fast syscall
	[WARN]  Hit 10000 SIGTRAPs with si_addr 0xf7789cc0, ip 0xf7789cc0
	Trace/breakpoint trap (core dumped)

After:

	~/linux/linux/tools/testing/selftests/x86> ./single_step_syscall_32
	[RUN]   Set TF and check nop
	[OK]    Survived with TF set and 9 traps
	[RUN]   Set TF and check int80
	[OK]    Survived with TF set and 9 traps
	[RUN]   Set TF and check a fast syscall
	[OK]    Survived with TF set and 39 traps
	[RUN]   Fast syscall with TF cleared
	[OK]    Nothing unexpected happened
Reported-by: NEvan Teran <eteran@alum.rit.edu>
Reported-by: NPedro Alves <palves@redhat.com>
Tested-by: NAndres Freund <andres@anarazel.de>
Signed-off-by: NOleg Nesterov <oleg@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
[ Added x86 self-test info. ]
Signed-off-by: NIngo Molnar <mingo@kernel.org>
      fd0f86b6
    • J
      x86: mtrr: if: remove use of seq_printf return value · 3ac62bc0
      由 Joe Perches 提交于 
      The seq_printf return value, because it's frequently misused,
will eventually be converted to void.

See: commit 1f33c41c ("seq_file: Rename seq_overflow() to
     seq_has_overflowed() and make public")
Signed-off-by: NJoe Perches <joe@perches.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      3ac62bc0
  19. 15 4月, 2015 2 次提交
  21. 13 4月, 2015 1 次提交
  23. 12 4月, 2015 1 次提交
  25. 11 4月, 2015 5 次提交
  27. 10 4月, 2015 3 次提交
  29. 09 4月, 2015 2 次提交