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  1. 24 11月, 2012 1 次提交
  3. 09 11月, 2012 2 次提交
    • J
      MIPS: Make irqflags.h functions preempt-safe for non-mipsr2 cpus · e97c5b60
      由 Jim Quinlan 提交于 
      For non MIPSr2 processors, such as the BMIPS 5000, calls to
arch_local_irq_disable() and others may be preempted, and in doing
so a stale value may be restored to c0_status.  This fix disables
preemption for such processors prior to the call and enables it
after the call.

Those functions that needed this fix have been "outlined" to
mips-atomic.c, as they are no longer good candidates for inlining.

This bug was observed in a BMIPS 5000, occuring once every few hours
in a continuous reboot test.  It was traced to the write_lock_irq()
function which was being invoked in release_task() in exit.c.
By placing a number of "nops" inbetween the mfc0/mtc0 pair in
arch_local_irq_disable(), which is called by write_lock_irq(), we
were able to greatly increase the occurance of this bug.  Similarly,
the application of this commit silenced the bug.
Signed-off-by: NJim Quinlan <jim2101024@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: Kevin Cernekee cernekee@gmail.com
Cc: Jim Quinlan <jim2101024@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/4321/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      e97c5b60
    • J
      MIPS: Remove irqflags.h dependency from bitops.h · 92d11594
      由 Jim Quinlan 提交于 
      The "else clause" of most functions in bitops.h invoked
raw_local_irq_{save,restore}() and in doing so had a dependency on
irqflags.h.  This fix moves said code to bitops.c, removing the
dependency.
Signed-off-by: NJim Quinlan <jim2101024@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: Kevin Cernekee cernekee@gmail.com
Cc: Jim Quinlan <jim2101024@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/4320/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      92d11594
  5. 17 10月, 2012 2 次提交
  7. 23 8月, 2012 1 次提交
  9. 23 7月, 2012 1 次提交
  11. 01 2月, 2012 1 次提交
  13. 08 12月, 2011 1 次提交
  15. 29 11月, 2011 1 次提交
  17. 19 5月, 2011 1 次提交
  19. 31 3月, 2011 1 次提交
  21. 17 12月, 2010 1 次提交
  23. 13 4月, 2010 2 次提交
  25. 17 6月, 2009 1 次提交
  27. 08 6月, 2009 1 次提交
    • R
      MIPS: Outline udelay and fix a few issues. · 5636919b
      由 Ralf Baechle 提交于 
      Outlining fixes the issue were on certain CPUs such as the R10000 family
the delay loop would need an extra cycle if it overlaps a cacheline
boundary.

The rewrite also fixes build errors with GCC 4.4 which was changed in
way incompatible with the kernel's inline assembly.

Relying on pure C for computation of the delay value removes the need for
explicit.  The price we pay is a slight slowdown of the computation - to
be fixed on another day.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      5636919b
  29. 14 5月, 2009 1 次提交
  31. 31 1月, 2009 1 次提交
  33. 11 1月, 2009 1 次提交
  35. 28 10月, 2008 1 次提交
  37. 11 10月, 2008 3 次提交
  39. 21 9月, 2008 1 次提交
  41. 29 4月, 2008 1 次提交
  43. 12 3月, 2008 2 次提交
  45. 29 1月, 2008 4 次提交
    • R
      [MIPS] Eleminate local symbols from the symbol table. · c5ec1983
      由 Ralf Baechle 提交于 
      These symbols appear in oprofile output, stacktraces and similar but only
make the output harder to read.  Many identical symbol names such as
"both_aligned" were also being used in multiple source files making it
impossible to see which file actually was meant.  So let's get rid of them.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      c5ec1983
    • T
      [MIPS] IP28: added cache barrier to assembly routines · 930bff88
      由 Thomas Bogendoerfer 提交于 
      IP28 needs special treatment to avoid speculative accesses. gcc
takes care for .c code, but for assembly code we need to do it
manually.

This is taken from Peter Fuersts IP28 patches.
Signed-off-by: NThomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      930bff88
    • A
      [MIPS] Put cast inside macro instead of all the callers · 48ef2626
      由 Andrew Sharp 提交于 
      Since all the callers of the PHYS_TO_XKPHYS macro call with a constant,
put the cast to LL inside the macro where it really should be rather
than in all the callers.  This makes macros like PHYS_TO_XKSEG_UNCACHED
work without gcc whining.
Signed-off-by: NAndrew Sharp <andy.sharp@onstor.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      48ef2626
    • M
      [MIPS] R4000/R4400 daddiu erratum workaround · 619b6e18
      由 Maciej W. Rozycki 提交于 
       This complements the generic R4000/R4400 errata workaround code and adds 
bits for the daddiu problem.  In most places it just modifies handwritten 
assembly code so that the assembler is allowed to use a temporary register 
as daddiu may now be treated as a macro that expands to a sequence of li 
and daddu.  It is the AT register or, where AT is unavailable or used 
explicitly for another purpose, an explicitly-named register is selected, 
using the .set at=<reg> feature added recently to gas.  This feature is 
only used if CONFIG_CPU_DADDI_WORKAROUNDS has been set, so if the 
workaround remains disabled, the required version of binutils stays 
unchanged.

 Similarly, daddiu instructions put in branch delay slots in noreorder 
fragments are now taken out of them and the assembler is allowed to 
reorder them itself as possible (which it does making the whole idea of 
scheduling them into delay slots manually questionable).

 Also in the very few places where such a simple conversion was not 
possible, a handcoded longer sequence is implemented.

 Other than that there are changes to code responsible for building the 
TLB fault and page clear/copy handlers to avoid daddiu as appropriate.  
These are only effective if the erratum is verified to be present at the 
run time.

 Finally there is a trivial update to __delay(), because it uses daddiu in 
a branch delay slot.
Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      619b6e18
  47. 12 10月, 2007 1 次提交
  49. 27 8月, 2007 1 次提交
  51. 13 7月, 2007 2 次提交
  53. 11 7月, 2007 3 次提交
  55. 06 7月, 2007 1 次提交