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  1. 10 1月, 2009 1 次提交
    • P
      powerpc/perf_counter: Add generic support for POWER-family PMU hardware · 4574910e
      由 Paul Mackerras 提交于 
      This provides the architecture-specific functions needed to access
PMU hardware on the 64-bit PowerPC processors.  It has been designed
for the IBM POWER family (POWER 4/4+/5/5+/6 and PPC970) but will
hopefully also suit other 64-bit PowerPC machines (although probably
not Cell given how different it is in this area).  This doesn't
include back-ends for any specific processors.

This implements a system which allows back-ends to express the
constraints that their hardware has on what events can be counted
simultaneously.  The constraints are expressed as a 64-bit mask +
64-bit value for each event, and the encoding is capable of
expressing the constraints arising from having a set of multiplexers
feeding an event bus, with some events being available through
multiple multiplexer settings, such as we get on POWER4 and PPC970.
Furthermore, the back-end can supply alternative event codes for
each event, and the constraint checking code will try all possible
combinations of alternative event codes to try to find a combination
that will fit.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
      4574910e
  3. 09 1月, 2009 2 次提交
    • P
      powerpc: Provide a way to defer perf counter work until interrupts are enabled · 93a6d3ce
      由 Paul Mackerras 提交于 
      Because 64-bit powerpc uses lazy (soft) interrupt disabling, it is
possible for a performance monitor exception to come in when the
kernel thinks interrupts are disabled (i.e. when they are
soft-disabled but hard-enabled).  In such a situation the performance
monitor exception handler might have some processing to do (such as
process wakeups) which can't be done in what is effectively an NMI
handler.

This provides a way to defer that work until interrupts get enabled,
either in raw_local_irq_restore() or by returning from an interrupt
handler to code that had interrupts enabled.  We have a per-processor
flag that indicates that there is work pending to do when interrupts
subsequently get re-enabled.  This flag is checked in the interrupt
return path and in raw_local_irq_restore(), and if it is set,
perf_counter_do_pending() is called to do the pending work.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
      93a6d3ce
    • P
      powerpc/perf_counter: Add perf_counter system call on powerpc · d662ed26
      由 Paul Mackerras 提交于 
      ... with an empty/dummy asm/perf_counter.h so it builds.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
      d662ed26
  5. 29 12月, 2008 7 次提交
  7. 27 12月, 2008 1 次提交
  9. 25 12月, 2008 29 次提交