License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 15:07:57 +01:00
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2007-06-13 02:30:17 +10:00
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2007-03-19 11:53:53 +01:00
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2005-09-26 16:04:21 +10:00
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2010-10-22 00:17:55 +00:00
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2005-09-26 16:04:21 +10:00
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2008-09-11 01:31:45 -07:00
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2010-10-01 11:12:54 +00:00
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2005-09-26 16:04:21 +10:00
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2017-04-21 00:36:20 +10:00
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2009-08-14 15:00:53 +09:00
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2009-03-30 19:07:44 +09:00
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2009-08-14 15:00:53 +09:00
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2008-01-30 13:32:51 +01:00
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2009-10-13 19:44:44 +00:00
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2010-01-31 01:14:03 +00:00
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2009-10-13 19:44:44 +00:00
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2016-12-20 04:30:08 +10:00
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2017-07-12 14:35:52 -07:00
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2016-12-20 04:30:08 +10:00
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2017-08-01 22:00:52 +10:00
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2008-04-17 14:35:00 +10:00
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2008-04-17 14:35:01 +10:00
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2005-09-26 16:04:21 +10:00
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2008-01-30 13:31:20 +01:00
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2006-03-26 01:39:33 -08:00
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2015-06-24 15:25:31 +10:00
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2005-09-26 16:04:21 +10:00
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2017-03-06 22:53:59 +11:00
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include/linux/string.h: add the option of fortified string.h functions
This adds support for compiling with a rough equivalent to the glibc
_FORTIFY_SOURCE=1 feature, providing compile-time and runtime buffer
overflow checks for string.h functions when the compiler determines the
size of the source or destination buffer at compile-time. Unlike glibc,
it covers buffer reads in addition to writes.
GNU C __builtin_*_chk intrinsics are avoided because they would force a
much more complex implementation. They aren't designed to detect read
overflows and offer no real benefit when using an implementation based
on inline checks. Inline checks don't add up to much code size and
allow full use of the regular string intrinsics while avoiding the need
for a bunch of _chk functions and per-arch assembly to avoid wrapper
overhead.
This detects various overflows at compile-time in various drivers and
some non-x86 core kernel code. There will likely be issues caught in
regular use at runtime too.
Future improvements left out of initial implementation for simplicity,
as it's all quite optional and can be done incrementally:
* Some of the fortified string functions (strncpy, strcat), don't yet
place a limit on reads from the source based on __builtin_object_size of
the source buffer.
* Extending coverage to more string functions like strlcat.
* It should be possible to optionally use __builtin_object_size(x, 1) for
some functions (C strings) to detect intra-object overflows (like
glibc's _FORTIFY_SOURCE=2), but for now this takes the conservative
approach to avoid likely compatibility issues.
* The compile-time checks should be made available via a separate config
option which can be enabled by default (or always enabled) once enough
time has passed to get the issues it catches fixed.
Kees said:
"This is great to have. While it was out-of-tree code, it would have
blocked at least CVE-2016-3858 from being exploitable (improper size
argument to strlcpy()). I've sent a number of fixes for
out-of-bounds-reads that this detected upstream already"
[arnd@arndb.de: x86: fix fortified memcpy]
Link: http://lkml.kernel.org/r/20170627150047.660360-1-arnd@arndb.de
[keescook@chromium.org: avoid panic() in favor of BUG()]
Link: http://lkml.kernel.org/r/20170626235122.GA25261@beast
[keescook@chromium.org: move from -mm, add ARCH_HAS_FORTIFY_SOURCE, tweak Kconfig help]
Link: http://lkml.kernel.org/r/20170526095404.20439-1-danielmicay@gmail.com
Link: http://lkml.kernel.org/r/1497903987-21002-8-git-send-email-keescook@chromium.org
Signed-off-by: Daniel Micay <danielmicay@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-07-12 14:36:10 -07:00
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2017-03-06 22:53:59 +11:00
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2017-06-28 11:32:36 +10:00
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2017-03-06 22:53:59 +11:00
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2013-10-07 22:15:32 -04:00
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2014-01-01 11:32:26 -08:00
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2017-03-06 22:53:59 +11:00
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2017-01-14 13:32:50 -08:00
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2013-03-06 18:11:51 +00:00
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2017-03-06 22:53:59 +11:00
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2018-01-16 21:20:05 +11:00
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2017-03-06 22:53:59 +11:00
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powerpc: Convert VDSO update function to use new update_vsyscall interface
This converts the powerpc VDSO time update function to use the new
interface introduced in commit 576094b7f0aa ("time: Introduce new
GENERIC_TIME_VSYSCALL", 2012-09-11). Where the old interface gave
us the time as of the last update in seconds and whole nanoseconds,
with the new interface we get the nanoseconds part effectively in
a binary fixed-point format with tk->tkr_mono.shift bits to the
right of the binary point.
With the old interface, the fractional nanoseconds got truncated,
meaning that the value returned by the VDSO clock_gettime function
would have about 1ns of jitter in it compared to the value computed
by the generic timekeeping code in the kernel.
The powerpc VDSO time functions (clock_gettime and gettimeofday)
already work in units of 2^-32 seconds, or 0.23283 ns, because that
makes it simple to split the result into seconds and fractional
seconds, and represent the fractional seconds in either microseconds
or nanoseconds. This is good enough accuracy for now, so this patch
avoids changing how the VDSO works or the interface in the VDSO data
page.
This patch converts the powerpc update_vsyscall_old to be called
update_vsyscall and use the new interface. We convert the fractional
second to units of 2^-32 seconds without truncating to whole nanoseconds.
(There is still a conversion to whole nanoseconds for any legacy users
of the vdso_data/systemcfg stamp_xtime field.)
In addition, this improves the accuracy of the computation of tb_to_xs
for those systems with high-frequency timebase clocks (>= 268.5 MHz)
by doing the right shift in two parts, one before the multiplication and
one after, rather than doing the right shift before the multiplication.
(We can't do all of the right shift after the multiplication unless we
use 128-bit arithmetic.)
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-05-27 18:04:52 +10:00
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2017-03-06 22:53:59 +11:00
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2017-04-21 00:36:20 +10:00
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2017-03-06 22:53:59 +11:00
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2017-08-02 15:51:05 +02:00
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2017-06-29 03:04:11 +10:00
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2017-03-06 22:53:59 +11:00
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2017-06-06 14:31:20 +03:00
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2017-03-06 22:53:59 +11:00
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2017-04-19 18:22:26 +05:30
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2017-03-06 22:53:59 +11:00
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2017-07-12 14:35:52 -07:00
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2017-03-06 22:53:59 +11:00
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2017-08-18 15:15:51 -07:00
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2017-03-06 22:53:59 +11:00
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2017-05-19 15:46:41 +10:00
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2017-03-06 22:53:59 +11:00
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2010-06-29 12:43:34 +10:00
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2010-11-18 15:54:56 -08:00
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2014-02-28 14:42:56 +01:00
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2017-03-06 22:53:59 +11:00
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2012-12-25 16:23:09 -05:00
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2017-03-06 22:53:59 +11:00
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2005-09-26 16:04:21 +10:00
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2013-09-23 12:04:51 +10:00
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2016-11-03 16:15:42 +11:00
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2013-09-23 12:04:51 +10:00
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2005-09-26 16:04:21 +10:00
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2005-11-23 17:57:25 +11:00
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2005-09-26 16:04:21 +10:00
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2013-11-25 23:23:11 +00:00
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2005-09-26 16:04:21 +10:00
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2008-01-02 17:03:11 -08:00
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[PATCH v3] ipc: provide generic compat versions of IPC syscalls
When using the "compat" APIs, architectures will generally want to
be able to make direct syscalls to msgsnd(), shmctl(), etc., and
in the kernel we would want them to be handled directly by
compat_sys_xxx() functions, as is true for other compat syscalls.
However, for historical reasons, several of the existing compat IPC
syscalls do not do this. semctl() expects a pointer to the fourth
argument, instead of the fourth argument itself. msgsnd(), msgrcv()
and shmat() expect arguments in different order.
This change adds an ARCH_WANT_OLD_COMPAT_IPC config option that can be
set to preserve this behavior for ports that use it (x86, sparc, powerpc,
s390, and mips). No actual semantics are changed for those architectures,
and there is only a minimal amount of code refactoring in ipc/compat.c.
Newer architectures like tile (and perhaps future architectures such
as arm64 and unicore64) should not select this option, and thus can
avoid having any IPC-specific code at all in their architecture-specific
compat layer. In the same vein, if this option is not selected, IPC_64
mode is assumed, since that's what the <asm-generic> headers expect.
The workaround code in "tile" for msgsnd() and msgrcv() is removed
with this change; it also fixes the bug that shmat() and semctl() were
not being properly handled.
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-03-15 13:13:38 -04:00
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2012-12-25 19:27:42 -05:00
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2005-09-26 16:04:21 +10:00
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2008-11-11 09:05:16 +01:00
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2005-09-26 16:04:21 +10:00
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2014-08-18 17:13:41 -04:00
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2005-09-26 16:04:21 +10:00
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2006-01-10 21:43:56 -06:00
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2006-09-12 03:04:40 -04:00
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2006-12-08 03:30:41 -08:00
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2007-03-20 05:18:02 +11:00
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2007-05-23 09:51:46 -05:00
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2007-03-20 05:18:02 +11:00
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2011-04-14 18:29:16 +00:00
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2006-01-16 10:53:22 -06:00
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2007-12-08 02:12:39 +01:00
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2007-05-03 22:31:38 +10:00
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2007-12-08 02:14:00 +01:00
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2009-09-16 01:43:57 +04:00
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2012-07-20 20:42:36 +08:00
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2007-12-08 02:14:00 +01:00
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2006-11-11 17:24:53 +11:00
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2006-11-11 17:25:08 +11:00
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2007-12-21 15:37:07 +11:00
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2006-11-11 17:25:08 +11:00
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2009-03-31 15:23:17 -07:00
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2015-01-26 13:22:22 -06:00
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2009-03-31 15:23:17 -07:00
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2012-08-23 21:31:32 +00:00
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2010-02-08 11:50:57 +00:00
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2014-08-08 18:40:42 -05:00
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2015-04-14 15:45:57 -07:00
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2016-03-01 09:45:13 +05:30
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2015-04-14 15:45:57 -07:00
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2005-09-26 16:04:21 +10:00
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2008-10-18 20:27:21 -07:00
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[POWERPC] 4xx: PLB to PCI Express support
This adds to the previous 2 patches the support for the 4xx PCI Express
cells as found in the 440SPe revA, revB and 405EX.
Unfortunately, due to significant differences between these, and other
interesting "features" of those pieces of HW, the code isn't as simple
as it is for PCI and PCI-X and some of the functions differ significantly
between the 3 implementations. Thus, not only this code can only support
those 3 implementations for now and will refuse to operate on any other,
but there are added ifdef's to avoid the bloat of building a fairly large
amount of code on platforms that don't need it.
Also, this code currently only supports fully initializing root complex
nodes, not endpoint. Some more code will have to be lifted from the
arch/ppc implementation to add the endpoint support, though it's mostly
differences in memory mapping, and the question on how to represent
endpoint mode PCI in the device-tree is thus open.
Many thanks to Stefan Roese for testing & fixing up the 405EX bits !
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2007-12-21 15:39:24 +11:00
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2007-03-16 09:32:17 -05:00
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2005-09-26 16:04:21 +10:00
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2007-11-28 16:21:13 -08:00
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2005-09-26 16:04:21 +10:00
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2017-08-08 13:58:54 +02:00
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2005-09-26 16:04:21 +10:00
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2013-06-09 17:01:24 +10:00
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2013-07-16 19:57:15 +08:00
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2013-02-13 16:21:43 +00:00
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2014-01-08 21:25:31 +11:00
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2013-02-13 16:21:43 +00:00
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2017-05-29 17:39:40 +10:00
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2016-03-03 15:27:00 +11:00
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2017-02-10 12:16:59 +11:00
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2016-03-03 15:27:00 +11:00
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2008-02-04 22:28:08 -08:00
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2009-05-14 12:42:28 +00:00
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2005-09-26 16:04:21 +10:00
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2013-05-21 13:49:35 +10:00
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2015-11-20 17:14:01 +08:00
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2005-09-26 16:04:21 +10:00
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2009-11-25 17:23:25 +00:00
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2006-06-29 02:24:27 -07:00
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2008-02-05 00:10:18 -08:00
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2008-02-05 00:10:17 -08:00
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2013-11-15 09:50:50 +05:30
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2005-09-26 16:04:21 +10:00
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2013-01-16 18:53:25 -08:00
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2015-10-06 22:48:22 -05:00
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2015-09-09 15:38:55 -07:00
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2005-09-26 16:04:21 +10:00
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2006-06-29 01:32:47 -04:00
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2005-09-26 16:04:21 +10:00
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2006-06-29 01:32:47 -04:00
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2005-09-26 16:04:21 +10:00
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2013-08-20 21:38:03 +02:00
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2005-09-26 16:04:21 +10:00
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2016-11-29 23:45:53 +11:00
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powerpc: ima: get the kexec buffer passed by the previous kernel
Patch series "ima: carry the measurement list across kexec", v8.
The TPM PCRs are only reset on a hard reboot. In order to validate a
TPM's quote after a soft reboot (eg. kexec -e), the IMA measurement
list of the running kernel must be saved and then restored on the
subsequent boot, possibly of a different architecture.
The existing securityfs binary_runtime_measurements file conveniently
provides a serialized format of the IMA measurement list. This patch
set serializes the measurement list in this format and restores it.
Up to now, the binary_runtime_measurements was defined as architecture
native format. The assumption being that userspace could and would
handle any architecture conversions. With the ability of carrying the
measurement list across kexec, possibly from one architecture to a
different one, the per boot architecture information is lost and with it
the ability of recalculating the template digest hash. To resolve this
problem, without breaking the existing ABI, this patch set introduces
the boot command line option "ima_canonical_fmt", which is arbitrarily
defined as little endian.
The need for this boot command line option will be limited to the
existing version 1 format of the binary_runtime_measurements.
Subsequent formats will be defined as canonical format (eg. TPM 2.0
support for larger digests).
A simplified method of Thiago Bauermann's "kexec buffer handover" patch
series for carrying the IMA measurement list across kexec is included in
this patch set. The simplified method requires all file measurements be
taken prior to executing the kexec load, as subsequent measurements will
not be carried across the kexec and restored.
This patch (of 10):
The IMA kexec buffer allows the currently running kernel to pass the
measurement list via a kexec segment to the kernel that will be kexec'd.
The second kernel can check whether the previous kernel sent the buffer
and retrieve it.
This is the architecture-specific part which enables IMA to receive the
measurement list passed by the previous kernel. It will be used in the
next patch.
The change in machine_kexec_64.c is to factor out the logic of removing
an FDT memory reservation so that it can be used by remove_ima_buffer.
Link: http://lkml.kernel.org/r/1480554346-29071-2-git-send-email-zohar@linux.vnet.ibm.com
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andreas Steffen <andreas.steffen@strongswan.org>
Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: Josh Sklar <sklar@linux.vnet.ibm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-19 16:22:32 -08:00
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2016-11-29 23:45:53 +11:00
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2016-07-13 09:14:39 +08:00
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2016-10-19 14:16:00 +11:00
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2016-07-13 09:14:39 +08:00
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modversions: treat symbol CRCs as 32 bit quantities
The modversion symbol CRCs are emitted as ELF symbols, which allows us
to easily populate the kcrctab sections by relying on the linker to
associate each kcrctab slot with the correct value.
This has a couple of downsides:
- Given that the CRCs are treated as memory addresses, we waste 4 bytes
for each CRC on 64 bit architectures,
- On architectures that support runtime relocation, a R_<arch>_RELATIVE
relocation entry is emitted for each CRC value, which identifies it
as a quantity that requires fixing up based on the actual runtime
load offset of the kernel. This results in corrupted CRCs unless we
explicitly undo the fixup (and this is currently being handled in the
core module code)
- Such runtime relocation entries take up 24 bytes of __init space
each, resulting in a x8 overhead in [uncompressed] kernel size for
CRCs.
Switching to explicit 32 bit values on 64 bit architectures fixes most
of these issues, given that 32 bit values are not treated as quantities
that require fixing up based on the actual runtime load offset. Note
that on some ELF64 architectures [such as PPC64], these 32-bit values
are still emitted as [absolute] runtime relocatable quantities, even if
the value resolves to a build time constant. Since relative relocations
are always resolved at build time, this patch enables MODULE_REL_CRCS on
powerpc when CONFIG_RELOCATABLE=y, which turns the absolute CRC
references into relative references into .rodata where the actual CRC
value is stored.
So redefine all CRC fields and variables as u32, and redefine the
__CRC_SYMBOL() macro for 64 bit builds to emit the CRC reference using
inline assembler (which is necessary since 64-bit C code cannot use
32-bit types to hold memory addresses, even if they are ultimately
resolved using values that do not exceed 0xffffffff). To avoid
potential problems with legacy 32-bit architectures using legacy
toolchains, the equivalent C definition of the kcrctab entry is retained
for 32-bit architectures.
Note that this mostly reverts commit d4703aefdbc8 ("module: handle ppc64
relocating kcrctabs when CONFIG_RELOCATABLE=y")
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-02-03 09:54:06 +00:00
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2016-07-13 09:14:39 +08:00
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2016-10-14 18:31:33 +11:00
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2006-01-14 13:48:25 -08:00
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2017-05-08 15:56:24 -07:00
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2012-04-15 22:27:35 +00:00
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2016-10-19 14:16:00 +11:00
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2006-01-14 13:48:25 -08:00
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2017-05-08 15:56:24 -07:00
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2008-10-21 17:38:10 +00:00
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2006-01-14 13:48:25 -08:00
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2012-02-16 01:14:22 +00:00
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2017-05-08 15:56:24 -07:00
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2008-03-22 10:50:50 +11:00
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2012-02-16 01:14:22 +00:00
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2017-05-08 15:56:24 -07:00
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2012-02-16 01:14:22 +00:00
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2008-03-22 10:50:50 +11:00
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2005-09-26 16:04:21 +10:00
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2013-05-15 11:21:01 +02:00
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2005-09-26 16:04:21 +10:00
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2005-10-28 17:46:58 -07:00
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2006-04-10 22:53:53 -07:00
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2009-09-21 19:56:43 +00:00
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2006-04-10 22:53:53 -07:00
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2014-05-19 11:14:23 -07:00
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2014-05-16 16:41:20 -07:00
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2005-09-26 16:04:21 +10:00
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2005-11-29 19:20:55 +00:00
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2005-09-26 16:04:21 +10:00
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2005-11-29 19:20:55 +00:00
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2007-10-16 01:24:17 -07:00
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2005-11-11 14:22:35 +11:00
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2017-04-05 16:10:48 +10:00
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2005-09-26 16:04:21 +10:00
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2009-10-30 15:03:54 +11:00
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2011-06-28 09:54:48 +00:00
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2009-10-30 15:03:54 +11:00
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2016-11-15 21:59:38 +11:00
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2006-09-27 01:49:49 -07:00
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2005-09-26 16:04:21 +10:00
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2005-11-07 09:39:48 -08:00
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2006-10-21 10:24:14 -07:00
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powerpc/44x: Support for 256KB PAGE_SIZE
This patch adds support for 256KB pages on ppc44x-based boards.
For simplification of implementation with 256KB pages we still assume
2-level paging. As a side effect this leads to wasting extra memory space
reserved for PTE tables: only 1/4 of pages allocated for PTEs are
actually used. But this may be an acceptable trade-off to achieve the
high performance we have with big PAGE_SIZEs in some applications (e.g.
RAID).
Also with 256KB PAGE_SIZE we increase THREAD_SIZE up to 32KB to minimize
the risk of stack overflows in the cases of on-stack arrays, which size
depends on the page size (e.g. multipage BIOs, NTFS, etc.).
With 256KB PAGE_SIZE we need to decrease the PKMAP_ORDER at least down
to 9, otherwise all high memory (2 ^ 10 * PAGE_SIZE == 256MB) we'll be
occupied by PKMAP addresses leaving no place for vmalloc. We do not
separate PKMAP_ORDER for 256K from 16K/64K PAGE_SIZE here; actually that
value of 10 in support for 16K/64K had been selected rather intuitively.
Thus now for all cases of PAGE_SIZE on ppc44x (including the default, 4KB,
one) we have 512 pages for PKMAP.
Because ELF standard supports only page sizes up to 64K, then you should
use binutils later than 2.17.50.0.3 with '-zmax-page-size' set to 256K
for building applications, which are to be run with the 256KB-page sized
kernel. If using the older binutils, then you should patch them like follows:
--- binutils/bfd/elf32-ppc.c.orig
+++ binutils/bfd/elf32-ppc.c
-#define ELF_MAXPAGESIZE 0x10000
+#define ELF_MAXPAGESIZE 0x40000
One more restriction we currently have with 256KB page sizes is inability
to use shmem safely, so, for now, the 256KB is available only if you turn
the CONFIG_SHMEM option off (another variant is to use BROKEN).
Though, if you need shmem with 256KB pages, you can always remove the !SHMEM
dependency in 'config PPC_256K_PAGES', and use the workaround available here:
http://lkml.org/lkml/2008/12/19/20
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2009-01-29 01:40:44 +00:00
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2008-12-11 04:55:41 +03:00
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2005-11-07 11:06:55 +11:00
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2008-12-11 04:55:41 +03:00
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2016-01-29 22:32:49 +05:30
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2008-12-11 04:55:41 +03:00
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2015-08-07 16:19:46 +10:00
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2008-12-11 04:55:41 +03:00
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2015-08-07 16:19:46 +10:00
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2016-01-29 22:32:49 +05:30
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2008-12-11 04:55:41 +03:00
|
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|
powerpc/44x: Support for 256KB PAGE_SIZE
This patch adds support for 256KB pages on ppc44x-based boards.
For simplification of implementation with 256KB pages we still assume
2-level paging. As a side effect this leads to wasting extra memory space
reserved for PTE tables: only 1/4 of pages allocated for PTEs are
actually used. But this may be an acceptable trade-off to achieve the
high performance we have with big PAGE_SIZEs in some applications (e.g.
RAID).
Also with 256KB PAGE_SIZE we increase THREAD_SIZE up to 32KB to minimize
the risk of stack overflows in the cases of on-stack arrays, which size
depends on the page size (e.g. multipage BIOs, NTFS, etc.).
With 256KB PAGE_SIZE we need to decrease the PKMAP_ORDER at least down
to 9, otherwise all high memory (2 ^ 10 * PAGE_SIZE == 256MB) we'll be
occupied by PKMAP addresses leaving no place for vmalloc. We do not
separate PKMAP_ORDER for 256K from 16K/64K PAGE_SIZE here; actually that
value of 10 in support for 16K/64K had been selected rather intuitively.
Thus now for all cases of PAGE_SIZE on ppc44x (including the default, 4KB,
one) we have 512 pages for PKMAP.
Because ELF standard supports only page sizes up to 64K, then you should
use binutils later than 2.17.50.0.3 with '-zmax-page-size' set to 256K
for building applications, which are to be run with the 256KB-page sized
kernel. If using the older binutils, then you should patch them like follows:
--- binutils/bfd/elf32-ppc.c.orig
+++ binutils/bfd/elf32-ppc.c
-#define ELF_MAXPAGESIZE 0x10000
+#define ELF_MAXPAGESIZE 0x40000
One more restriction we currently have with 256KB page sizes is inability
to use shmem safely, so, for now, the 256KB is available only if you turn
the CONFIG_SHMEM option off (another variant is to use BROKEN).
Though, if you need shmem with 256KB pages, you can always remove the !SHMEM
dependency in 'config PPC_256K_PAGES', and use the workaround available here:
http://lkml.org/lkml/2008/12/19/20
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2009-01-29 01:40:44 +00:00
|
|
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|
2015-08-07 16:19:46 +10:00
|
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|
|
|
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|
|
powerpc/44x: Support for 256KB PAGE_SIZE
This patch adds support for 256KB pages on ppc44x-based boards.
For simplification of implementation with 256KB pages we still assume
2-level paging. As a side effect this leads to wasting extra memory space
reserved for PTE tables: only 1/4 of pages allocated for PTEs are
actually used. But this may be an acceptable trade-off to achieve the
high performance we have with big PAGE_SIZEs in some applications (e.g.
RAID).
Also with 256KB PAGE_SIZE we increase THREAD_SIZE up to 32KB to minimize
the risk of stack overflows in the cases of on-stack arrays, which size
depends on the page size (e.g. multipage BIOs, NTFS, etc.).
With 256KB PAGE_SIZE we need to decrease the PKMAP_ORDER at least down
to 9, otherwise all high memory (2 ^ 10 * PAGE_SIZE == 256MB) we'll be
occupied by PKMAP addresses leaving no place for vmalloc. We do not
separate PKMAP_ORDER for 256K from 16K/64K PAGE_SIZE here; actually that
value of 10 in support for 16K/64K had been selected rather intuitively.
Thus now for all cases of PAGE_SIZE on ppc44x (including the default, 4KB,
one) we have 512 pages for PKMAP.
Because ELF standard supports only page sizes up to 64K, then you should
use binutils later than 2.17.50.0.3 with '-zmax-page-size' set to 256K
for building applications, which are to be run with the 256KB-page sized
kernel. If using the older binutils, then you should patch them like follows:
--- binutils/bfd/elf32-ppc.c.orig
+++ binutils/bfd/elf32-ppc.c
-#define ELF_MAXPAGESIZE 0x10000
+#define ELF_MAXPAGESIZE 0x40000
One more restriction we currently have with 256KB page sizes is inability
to use shmem safely, so, for now, the 256KB is available only if you turn
the CONFIG_SHMEM option off (another variant is to use BROKEN).
Though, if you need shmem with 256KB pages, you can always remove the !SHMEM
dependency in 'config PPC_256K_PAGES', and use the workaround available here:
http://lkml.org/lkml/2008/12/19/20
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2009-01-29 01:40:44 +00:00
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2008-12-11 04:55:41 +03:00
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|
2005-11-07 11:06:55 +11:00
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2017-02-24 13:52:09 +13:00
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2008-04-11 11:11:56 +10:00
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2016-02-19 16:38:47 +11:00
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2009-07-21 15:25:53 +00:00
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|
powerpc/mm: Update FORCE_MAX_ZONEORDER range to allow hugetlb w/4K
For hugetlb to work with 4K page size, we need MAX_ORDER to be 13 or
more. When switching from a 64K page size to 4K linux page size using
make oldconfig, we end up with a CONFIG_FORCE_MAX_ZONEORDER value of 9.
This results in a 16M hugepage beiing considered as a gigantic huge page
which in turn results in failure to setup hugepages if gigantic hugepage
support is not enabled.
This also results in kernel crash with 4K radix configuration. We
hit the below BUG_ON on radix:
kernel BUG at mm/huge_memory.c:364!
Oops: Exception in kernel mode, sig: 5 [#1]
SMP NR_CPUS=2048 NUMA PowerNV
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.0-rc1-00006-gbae9cc6 #1
task: c0000000f1af8000 task.stack: c0000000f1aec000
NIP: c000000000c5fa0c LR: c000000000c5f9d8 CTR: c000000000c5f9a4
REGS: c0000000f1aef920 TRAP: 0700 Not tainted (4.8.0-rc1-00006-gbae9cc6)
MSR: 9000000102029033 <SF,HV,VEC,EE,ME,IR,DR,RI,LE,TM[E]> CR: 24000844 XER: 00000000
CFAR: c000000000c5f9e0 SOFTE: 1
....
NIP [c000000000c5fa0c] hugepage_init+0x68/0x238
LR [c000000000c5f9d8] hugepage_init+0x34/0x238
Fixes: a7ee539584acf ("powerpc/Kconfig: Update config option based on page size")
Cc: stable@vger.kernel.org # v4.7+
Reported-by: Santhosh <santhog4@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-09-19 23:01:33 +05:30
|
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|
2009-07-21 15:25:53 +00:00
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2008-09-24 04:29:08 +00:00
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2008-04-11 11:11:56 +10:00
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[POWERPC] Provide a way to protect 4k subpages when using 64k pages
Using 64k pages on 64-bit PowerPC systems makes life difficult for
emulators that are trying to emulate an ISA, such as x86, which use a
smaller page size, since the emulator can no longer use the MMU and
the normal system calls for controlling page protections. Of course,
the emulator can emulate the MMU by checking and possibly remapping
the address for each memory access in software, but that is pretty
slow.
This provides a facility for such programs to control the access
permissions on individual 4k sub-pages of 64k pages. The idea is
that the emulator supplies an array of protection masks to apply to a
specified range of virtual addresses. These masks are applied at the
level where hardware PTEs are inserted into the hardware page table
based on the Linux PTEs, so the Linux PTEs are not affected. Note
that this new mechanism does not allow any access that would otherwise
be prohibited; it can only prohibit accesses that would otherwise be
allowed. This new facility is only available on 64-bit PowerPC and
only when the kernel is configured for 64k pages.
The masks are supplied using a new subpage_prot system call, which
takes a starting virtual address and length, and a pointer to an array
of protection masks in memory. The array has a 32-bit word per 64k
page to be protected; each 32-bit word consists of 16 2-bit fields,
for which 0 allows any access (that is otherwise allowed), 1 prevents
write accesses, and 2 or 3 prevent any access.
Implicit in this is that the regions of the address space that are
protected are switched to use 4k hardware pages rather than 64k
hardware pages (on machines with hardware 64k page support). In fact
the whole process is switched to use 4k hardware pages when the
subpage_prot system call is used, but this could be improved in future
to switch only the affected segments.
The subpage protection bits are stored in a 3 level tree akin to the
page table tree. The top level of this tree is stored in a structure
that is appended to the top level of the page table tree, i.e., the
pgd array. Since it will often only be 32-bit addresses (below 4GB)
that are protected, the pointers to the first four bottom level pages
are also stored in this structure (each bottom level page contains the
protection bits for 1GB of address space), so the protection bits for
addresses below 4GB can be accessed with one fewer loads than those
for higher addresses.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-01-24 08:35:13 +11:00
|
|
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|
|
|
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|
|
2008-12-11 04:55:41 +03:00
|
|
|
|
[POWERPC] Provide a way to protect 4k subpages when using 64k pages
Using 64k pages on 64-bit PowerPC systems makes life difficult for
emulators that are trying to emulate an ISA, such as x86, which use a
smaller page size, since the emulator can no longer use the MMU and
the normal system calls for controlling page protections. Of course,
the emulator can emulate the MMU by checking and possibly remapping
the address for each memory access in software, but that is pretty
slow.
This provides a facility for such programs to control the access
permissions on individual 4k sub-pages of 64k pages. The idea is
that the emulator supplies an array of protection masks to apply to a
specified range of virtual addresses. These masks are applied at the
level where hardware PTEs are inserted into the hardware page table
based on the Linux PTEs, so the Linux PTEs are not affected. Note
that this new mechanism does not allow any access that would otherwise
be prohibited; it can only prohibit accesses that would otherwise be
allowed. This new facility is only available on 64-bit PowerPC and
only when the kernel is configured for 64k pages.
The masks are supplied using a new subpage_prot system call, which
takes a starting virtual address and length, and a pointer to an array
of protection masks in memory. The array has a 32-bit word per 64k
page to be protected; each 32-bit word consists of 16 2-bit fields,
for which 0 allows any access (that is otherwise allowed), 1 prevents
write accesses, and 2 or 3 prevent any access.
Implicit in this is that the regions of the address space that are
protected are switched to use 4k hardware pages rather than 64k
hardware pages (on machines with hardware 64k page support). In fact
the whole process is switched to use 4k hardware pages when the
subpage_prot system call is used, but this could be improved in future
to switch only the affected segments.
The subpage protection bits are stored in a 3 level tree akin to the
page table tree. The top level of this tree is stored in a structure
that is appended to the top level of the page table tree, i.e., the
pgd array. Since it will often only be 32-bit addresses (below 4GB)
that are protected, the pointers to the first four bottom level pages
are also stored in this structure (each bottom level page contains the
protection bits for 1GB of address space), so the protection bits for
addresses below 4GB can be accessed with one fewer loads than those
for higher addresses.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-01-24 08:35:13 +11:00
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2014-10-08 19:54:50 +11:00
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2005-09-26 16:04:21 +10:00
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2012-09-10 00:35:26 +00:00
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2013-07-31 16:31:26 +10:00
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2012-09-10 00:35:26 +00:00
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2005-09-26 16:04:21 +10:00
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2014-02-20 21:48:17 +01:00
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2008-07-09 09:41:52 -06:00
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2008-01-15 23:17:00 -05:00
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2005-09-26 16:04:21 +10:00
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2012-02-22 14:10:12 +00:00
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2005-09-26 16:04:21 +10:00
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2013-03-27 00:47:03 +00:00
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2005-10-26 16:47:42 +10:00
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2005-09-26 16:04:21 +10:00
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2013-03-27 00:47:03 +00:00
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2005-09-26 16:04:21 +10:00
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2007-02-10 01:43:14 -08:00
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2010-03-10 15:23:27 -08:00
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2010-05-26 14:44:33 -07:00
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2005-09-26 16:04:21 +10:00
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2010-07-15 07:38:16 +00:00
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2005-09-26 16:04:21 +10:00
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2005-10-26 16:36:55 +10:00
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2006-01-14 16:57:39 -06:00
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2005-10-26 16:36:55 +10:00
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2005-09-26 16:04:21 +10:00
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2006-01-10 21:43:56 -06:00
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2007-07-10 18:44:34 +08:00
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2009-01-28 13:25:29 -06:00
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2007-07-10 18:44:34 +08:00
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2009-09-16 01:43:57 +04:00
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2010-10-08 10:25:27 +00:00
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2008-03-26 22:39:50 +11:00
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2008-04-11 21:03:40 +04:00
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2010-10-18 15:22:31 +08:00
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2008-04-11 21:03:40 +04:00
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2010-10-18 15:22:31 +08:00
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2008-04-11 21:03:40 +04:00
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2008-05-23 20:38:54 +04:00
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2005-09-26 16:04:21 +10:00
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2008-06-26 11:07:56 -06:00
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2005-09-26 16:04:21 +10:00
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2008-06-26 11:07:56 -06:00
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2017-08-08 13:58:54 +02:00
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2009-12-12 06:31:39 +00:00
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2017-08-08 13:58:52 +02:00
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2011-11-24 21:06:41 +02:00
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2005-09-26 16:04:21 +10:00
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2007-07-10 10:54:40 -06:00
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2005-09-26 16:04:21 +10:00
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2017-08-08 13:58:52 +02:00
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2005-10-26 16:47:42 +10:00
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2005-09-26 16:04:21 +10:00
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2005-10-26 16:36:55 +10:00
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2005-09-26 16:04:21 +10:00
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2008-04-18 13:33:39 -07:00
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2014-01-23 15:56:04 -08:00
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2011-03-23 16:43:03 -07:00
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2008-04-18 13:33:39 -07:00
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2011-03-23 16:43:03 -07:00
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2014-01-23 15:56:04 -08:00
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2011-03-23 16:43:03 -07:00
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2008-04-18 13:33:39 -07:00
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2005-09-26 16:04:21 +10:00
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2011-12-14 22:57:15 +00:00
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2005-09-26 16:04:21 +10:00
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2008-12-08 19:34:58 -08:00
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2009-03-31 08:05:50 -04:00
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2008-12-08 19:34:58 -08:00
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2011-12-14 22:57:15 +00:00
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2013-01-16 18:53:25 -08:00
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2011-12-14 22:57:15 +00:00
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2008-04-22 04:22:34 +10:00
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2011-12-14 22:57:15 +00:00
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2008-04-22 04:22:34 +10:00
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2011-12-14 22:57:15 +00:00
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2008-04-22 04:22:34 +10:00
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2011-12-14 22:58:12 +00:00
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2008-04-22 04:22:34 +10:00
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2005-09-26 16:04:21 +10:00
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2008-04-22 04:22:34 +10:00
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2005-09-26 16:04:21 +10:00
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2008-04-22 04:22:34 +10:00
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2011-12-14 22:57:15 +00:00
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2005-09-26 16:04:21 +10:00
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2008-04-22 04:22:34 +10:00
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2011-12-14 22:57:15 +00:00
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2008-04-22 04:22:34 +10:00
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2008-12-08 19:34:59 -08:00
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2008-04-22 04:22:34 +10:00
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2005-09-26 16:04:21 +10:00
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2013-03-27 00:47:03 +00:00
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2007-10-11 13:40:21 -05:00
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2005-09-26 16:04:21 +10:00
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2009-05-27 13:33:14 +10:00
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2005-09-26 16:04:21 +10:00
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2017-07-12 12:08:53 +02:00
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2016-05-17 09:02:56 +02:00
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2017-07-12 12:08:51 +02:00
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2016-05-17 09:02:56 +02:00
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2017-07-12 12:08:51 +02:00
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2005-09-26 16:04:21 +10:00
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2005-09-30 16:16:52 +10:00
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|
powerpc: Work around gcc miscompilation of __pa() on 64-bit
On 64-bit, __pa(&static_var) gets miscompiled by recent versions of
gcc as something like:
addis 3,2,.LANCHOR1+4611686018427387904@toc@ha
addi 3,3,.LANCHOR1+4611686018427387904@toc@l
This ends up effectively ignoring the offset, since its bottom 32 bits
are zero, and means that the result of __pa() still has 0xC in the top
nibble. This happens with gcc 4.8.1, at least.
To work around this, for 64-bit we make __pa() use an AND operator,
and for symmetry, we make __va() use an OR operator. Using an AND
operator rather than a subtraction ends up with slightly shorter code
since it can be done with a single clrldi instruction, whereas it
takes three instructions to form the constant (-PAGE_OFFSET) and add
it on. (Note that MEMORY_START is always 0 on 64-bit.)
CC: <stable@vger.kernel.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-08-27 16:07:49 +10:00
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2008-04-22 04:22:34 +10:00
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2005-09-30 16:16:52 +10:00
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2005-09-30 17:24:15 +10:00
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2008-04-22 04:22:34 +10:00
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2005-09-30 16:16:52 +10:00
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2013-10-11 14:07:57 +11:00
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2005-09-26 16:04:21 +10:00
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2007-09-21 00:00:11 +10:00
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2007-09-16 20:53:25 +10:00
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2008-04-16 23:28:09 -05:00
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powerpc/livepatch: Add live patching support on ppc64le
Add the kconfig logic & assembly support for handling live patched
functions. This depends on DYNAMIC_FTRACE_WITH_REGS, which in turn
depends on the new -mprofile-kernel ftrace ABI, which is only supported
currently on ppc64le.
Live patching is handled by a special ftrace handler. This means it runs
from ftrace_caller(). The live patch handler modifies the NIP so as to
redirect the return from ftrace_caller() to the new patched function.
However there is one particularly tricky case we need to handle.
If a function A calls another function B, and it is known at link time
that they share the same TOC, then A will not save or restore its TOC,
and will call the local entry point of B.
When we live patch B, we replace it with a new function C, which may
not have the same TOC as A. At live patch time it's too late to modify A
to do the TOC save/restore, so the live patching code must interpose
itself between A and C, and do the TOC save/restore that A omitted.
An additionaly complication is that the livepatch code can not create a
stack frame in order to save the TOC. That is because if C takes > 8
arguments, or is varargs, A will have written the arguments for C in
A's stack frame.
To solve this, we introduce a "livepatch stack" which grows upward from
the base of the regular stack, and is used to store the TOC & LR when
calling a live patched function.
When the patched function returns, we retrieve the real LR & TOC from
the livepatch stack, restore them, and pop the livepatch "stack frame".
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Torsten Duwe <duwe@suse.de>
Reviewed-by: Balbir Singh <bsingharora@gmail.com>
2016-03-24 22:04:05 +11:00
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