1. 20 3月, 2014 8 次提交
  2. 07 3月, 2014 19 次提交
  3. 28 2月, 2014 8 次提交
  4. 17 2月, 2014 5 次提交
    • G
      powerpc/eeh: Disable EEH on reboot · 66f9af83
      Gavin Shan 提交于
      We possiblly detect EEH errors during reboot, particularly in kexec
      path, but it's impossible for device drivers and EEH core to handle
      or recover them properly.
      
      The patch registers one reboot notifier for EEH and disable EEH
      subsystem during reboot. That means the EEH errors is going to be
      cleared by hardware reset or second kernel during early stage of
      PCI probe.
      Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      66f9af83
    • G
      powerpc/eeh: Cleanup on eeh_subsystem_enabled · 2ec5a0ad
      Gavin Shan 提交于
      The patch cleans up variable eeh_subsystem_enabled so that we needn't
      refer the variable directly from external. Instead, we will use
      function eeh_enabled() and eeh_set_enable() to operate the variable.
      Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      2ec5a0ad
    • G
      powerpc/powernv: Rework EEH reset · 5b2e198e
      Gavin Shan 提交于
      When doing reset in order to recover the affected PE, we issue
      hot reset on PE primary bus if it's not root bus. Otherwise, we
      issue hot or fundamental reset on root port or PHB accordingly.
      For the later case, we didn't cover the situation where PE only
      includes root port and it potentially causes kernel crash upon
      EEH error to the PE.
      
      The patch reworks the logic of EEH reset to improve the code
      readability and also avoid the kernel crash.
      
      Cc: stable@vger.kernel.org
      Reported-by: NThadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
      Signed-off-by: NGavin Shan <shangw@linux.vnet.ibm.com>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      5b2e198e
    • A
      powerpc: Use unstripped VDSO image for more accurate profiling data · 24b659a1
      Anton Blanchard 提交于
      We are seeing a lot of hits in the VDSO that are not resolved by perf.
      A while(1) gettimeofday() loop shows the issue:
      
      27.64%  [vdso]  [.] 0x000000000000060c
      22.57%  [vdso]  [.] 0x0000000000000628
      16.88%  [vdso]  [.] 0x0000000000000610
      12.39%  [vdso]  [.] __kernel_gettimeofday
       6.09%  [vdso]  [.] 0x00000000000005f8
       3.58%  test    [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
       2.94%  [vdso]  [.] __kernel_datapage_offset
       2.90%  test    [.] main
      
      We are using a stripped VDSO image which means only symbols with
      relocation info can be resolved. There isn't a lot of point to
      stripping the VDSO, the debug info is only about 1kB:
      
      4680 arch/powerpc/kernel/vdso64/vdso64.so
      5815 arch/powerpc/kernel/vdso64/vdso64.so.dbg
      
      By using the unstripped image, we can resolve all the symbols in the
      VDSO and the perf profile data looks much better:
      
      76.53%  [vdso]  [.] __do_get_tspec
      12.20%  [vdso]  [.] __kernel_gettimeofday
       5.05%  [vdso]  [.] __get_datapage
       3.20%  test    [.] main
       2.92%  test    [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
      Signed-off-by: NAnton Blanchard <anton@samba.org>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      24b659a1
    • A
      powerpc: Link VDSOs at 0x0 · a0a4419e
      Anton Blanchard 提交于
      perf is failing to resolve symbols in the VDSO. A while (1)
      gettimeofday() loop shows:
      
      93.99%  [vdso]  [.] 0x00000000000005e0
       3.12%  test    [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
       2.81%  test    [.] main
      
      The reason for this is that we are linking our VDSO shared libraries
      at 1MB, which is a little weird. Even though this is uncommon, Alan
      points out that it is valid and we should probably fix perf userspace.
      
      Regardless, I can't see a reason why we are doing this. The code
      is all position independent and we never rely on the VDSO ending
      up at 1M (and we never place it there on 64bit tasks).
      
      Changing our link address to 0x0 fixes perf VDSO symbol resolution:
      
      73.18%  [vdso]  [.] 0x000000000000060c
      12.39%  [vdso]  [.] __kernel_gettimeofday
       3.58%  test    [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
       2.94%  [vdso]  [.] __kernel_datapage_offset
       2.90%  test    [.] main
      
      We still have some local symbol resolution issues that will be
      fixed in a subsequent patch.
      Signed-off-by: NAnton Blanchard <anton@samba.org>
      Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      a0a4419e