linux.git/arch/powerpc/kernel/crash_dump.c, branch v3.12.65

powerpc/crashdump : Fix page frame number check in copy_oldmem_page

2014-03-05T16:13:45+00:00

commit f5295bd8ea8a65dc5eac608b151386314cb978f1 upstream.

In copy_oldmem_page, the current check using max_pfn and min_low_pfn to
decide if the page is backed or not, is not valid when the memory layout is
not continuous.

This happens when running as a QEMU/KVM guest, where RTAS is mapped higher
in the memory. In that case max_pfn points to the end of RTAS, and a hole
between the end of the kdump kernel and RTAS is not backed by PTEs. As a
consequence, the kdump kernel is crashing in copy_oldmem_page when accessing
in a direct way the pages in that hole.

This fix relies on the memblock's service memblock_is_region_memory to
check if the read page is part or not of the directly accessible memory.

Signed-off-by: Laurent Dufour 
Tested-by: Mahesh Salgaonkar 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Jiri Slaby

powerpc: Remove savemaxmem parameter setup

2013-07-03T23:08:03+00:00

saved_max_pfn is used to know the amount of memory that the previous
kernel used.  And for powerpc, we set saved_max_pfn by passing the kernel
commandline parameter "savemaxmem=".

The only user of saved_max_pfn in powerpc is read_oldmem interface.  Since
we have removed read_oldmem, we don't need this parameter anymore.

Signed-off-by: Zhang Yanfei 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: "Eric W. Biederman" 
Cc: "H. Peter Anvin" 
Cc: Dave Hansen 
Cc: Fenghua Yu 
Cc: Heiko Carstens 
Cc: Martin Schwidefsky 
Cc: Matt Fleming 
Cc: Michael Holzheu 
Cc: Ralf Baechle 
Cc: Tony Luck 
Cc: Vivek Goyal 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/ppc: use common help functions to free reserved pages

2013-04-29T22:54:30+00:00

Use common help functions to free reserved pages.

Signed-off-by: Jiang Liu 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Anatolij Gustschin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

powerpc: Rename mapping based RELOCATABLE to DYNAMIC_MEMSTART for BookE

2011-12-20T15:20:19+00:00

The current implementation of CONFIG_RELOCATABLE in BookE is based
on mapping the page aligned kernel load address to KERNELBASE. This
approach however is not enough for platforms, where the TLB page size
is large (e.g, 256M on 44x). So we are renaming the RELOCATABLE used
currently in BookE to DYNAMIC_MEMSTART to reflect the actual method.

The CONFIG_RELOCATABLE for PPC32(BookE) based on processing of the
dynamic relocations will be introduced in the later in the patch series.

This change would allow the use of the old method of RELOCATABLE for
platforms which can afford to enforce the page alignment (platforms with
smaller TLB size).

Changes since v3:

* Introduced a new config, NONSTATIC_KERNEL, to denote a kernel which is
  either a RELOCATABLE or DYNAMIC_MEMSTART(Suggested by: Josh Boyer)

Suggested-by: Scott Wood 
Tested-by: Scott Wood 

Signed-off-by: Suzuki K. Poulose 
Cc: Scott Wood 
Cc: Kumar Gala 
Cc: Josh Boyer 
Cc: Benjamin Herrenschmidt 
Cc: linux ppc dev 
Signed-off-by: Josh Boyer

crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn

2011-03-24T02:47:19+00:00

The Xen PV drivers in a crashed HVM guest can not connect to the dom0
backend drivers because both frontend and backend drivers are still in
connected state.  To run the connection reset function only in case of a
crashdump, the is_kdump_kernel() function needs to be available for the PV
driver modules.

Consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn into
kernel/crash_dump.c Also export elfcorehdr_addr to make is_kdump_kernel()
usable for modules.

Leave 'elfcorehdr' as early_param().  This changes powerpc from __setup()
to early_param().  It adds an address range check from x86 also on ia64
and powerpc.

[akpm@linux-foundation.org: additional #includes]
[akpm@linux-foundation.org: remove elfcorehdr_addr export]
[akpm@linux-foundation.org: fix for Tejun's mm/nobootmem.c changes]
Signed-off-by: Olaf Hering 
Cc: Russell King 
Cc: "Luck, Tony" 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mundt 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: "H. Peter Anvin" 
Cc: Johannes Weiner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

powerpc/kdump: Override crash_free_reserved_phys_range to avoid freeing RTAS

2010-11-29T04:48:17+00:00

The crashkernel region will almost always overlap RTAS. If we free the
crashkernel region via "echo 0 > /sys/kernel/kexec_crash_size" then we will
free RTAS and the machine will crash in confusing and exciting ways.

Override crash_free_reserved_phys_range and check for overlap with RTAS.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

Merge commit 'gcl/next' into next

2010-08-04T00:26:03+00:00

powerpc/crashdump: Fix issues with kexec and 36bit physical addr

2010-07-31T04:56:30+00:00

Fix sizes of variables so correct values are exported via /proc.
Cast variable in comparison to avoid compiler error.

Signed-off-by: Matthew McClintock 
Signed-off-by: Benjamin Herrenschmidt

lmb: rename to memblock

2010-07-14T07:14:00+00:00

via following scripts

      FILES=$(find * -type f | grep -vE 'oprofile|[^K]config')

      sed -i \
        -e 's/lmb/memblock/g' \
        -e 's/LMB/MEMBLOCK/g' \
        $FILES

      for N in $(find . -name lmb.[ch]); do
        M=$(echo $N | sed 's/lmb/memblock/g')
        mv $N $M
      done

and remove some wrong change like lmbench and dlmb etc.

also move memblock.c from lib/ to mm/

Suggested-by: Ingo Molnar 
Acked-by: "H. Peter Anvin" 
Acked-by: Benjamin Herrenschmidt 
Acked-by: Linus Torvalds 
Signed-off-by: Yinghai Lu 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Unify opcode definitions and support

2009-02-22T23:48:56+00:00

Create a new header that becomes a single location for defining PowerPC
opcodes used by code that is either generationg instructions
at runtime (fixups, debug, etc.), emulating instructions, or just
compiling instructions old assemblers don't know about.

We currently don't handle the floating point emulation or alignment decode
as both are better handled by the specific decode support they already
have.

Added support for the new dcbzl, dcbal, msgsnd, tlbilx, & wait instructions
since older assemblers don't know about them.

Signed-off-by: Kumar Gala 
Signed-off-by: Benjamin Herrenschmidt