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  1. 14 12月, 2015 16 次提交
  3. 02 12月, 2015 3 次提交
  5. 01 12月, 2015 9 次提交
  7. 26 11月, 2015 1 次提交
  9. 16 11月, 2015 1 次提交
  11. 10 11月, 2015 1 次提交
  13. 28 10月, 2015 3 次提交
    • K
      powerpc/e6500: hw tablewalk: make sure we invalidate and write to the same tlb entry · e1f580e8
      由 Kevin Hao 提交于 
      In order to workaround Erratum A-008139, we have to invalidate the
tlb entry with tlbilx before overwriting. Due to the performance
consideration, we don't add any memory barrier when acquire/release
the tcd lock. This means the two load instructions for esel_next do
have the possibility to return different value. This is definitely
not acceptable due to the Erratum A-008139. We have two options to
fix this issue:
  a) Add memory barrier when acquire/release tcd lock to order the
     load/store to esel_next.
  b) Just make sure to invalidate and write to the same tlb entry and
     tolerate the race that we may get the wrong value and overwrite
     the tlb entry just updated by the other thread.

We observe better performance using option b. So reserve an additional
register to save the value of the esel_next.
Signed-off-by: NKevin Hao <haokexin@gmail.com>
Signed-off-by: NScott Wood <scottwood@freescale.com>
      e1f580e8
    • S
      powerpc/booke: Only use VIRT_PHYS_OFFSET on booke32 · ffda09a9
      由 Scott Wood 提交于 
      The way VIRT_PHYS_OFFSET is not correct on book3e-64, because
it does not account for CONFIG_RELOCATABLE other than via the
32-bit-only virt_phys_offset.

book3e-64 can (and if the comment about a GCC miscompilation is still
relevant, should) use the normal ppc64 __va/__pa.

At this point, only booke-32 will use VIRT_PHYS_OFFSET, so given the
issues with its calculation, restrict its definition to booke-32.
Signed-off-by: NScott Wood <scottwood@freescale.com>
      ffda09a9
    • T
      powerpc/book3e: support CONFIG_RELOCATABLE · 1cb6e064
      由 Tiejun Chen 提交于 
      book3e is different with book3s since 3s includes the exception
vectors code in head_64.S as it relies on absolute addressing
which is only possible within this compilation unit. So we have
to get that label address with got.

And when boot a relocated kernel, we should reset ipvr properly again
after .relocate.
Signed-off-by: NTiejun Chen <tiejun.chen@windriver.com>
[scottwood: cleanup and ifdef removal]
Signed-off-by: NScott Wood <scottwood@freescale.com>
      1cb6e064
  15. 23 10月, 2015 1 次提交
  17. 22 10月, 2015 3 次提交
  19. 21 10月, 2015 1 次提交
    • P
      powerpc: Revert "Use the POWER8 Micro Partition Prefetch Engine in KVM HV on POWER8" · 23316316
      由 Paul Mackerras 提交于 
      This reverts commit 9678cdaa ("Use the POWER8 Micro Partition
Prefetch Engine in KVM HV on POWER8") because the original commit had
multiple, partly self-cancelling bugs, that could cause occasional
memory corruption.

In fact the logmpp instruction was incorrectly using register r0 as the
source of the buffer address and operation code, and depending on what
was in r0, it would either do nothing or corrupt the 64k page pointed to
by r0.

The logmpp instruction encoding and the operation code definitions could
be corrected, but then there is the problem that there is no clearly
defined way to know when the hardware has finished writing to the
buffer.

The original commit attempted to work around this by aborting the
write-out before starting the prefetch, but this is ineffective in the
case where the virtual core is now executing on a different physical
core from the one where the write-out was initiated.

These problems plus advice from the hardware designers not to use the
function (since the measured performance improvement from using the
feature was actually mostly negative), mean that reverting the code is
the best option.

Fixes: 9678cdaa ("Use the POWER8 Micro Partition Prefetch Engine in KVM HV on POWER8")
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      23316316
  21. 15 10月, 2015 1 次提交