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 07:07:57 -07:00
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// SPDX-License-Identifier: GPL-2.0
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2005-04-16 15:20:36 -07:00
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/*
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* r2300.c: R2000 and R3000 specific mmu/cache code.
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*
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2011-04-04 14:15:29 -07:00
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* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
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2005-04-16 15:20:36 -07:00
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*
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* with a lot of changes to make this thing work for R3000s
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* Tx39XX R4k style caches added. HK
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* Copyright (C) 1998, 1999, 2000 Harald Koerfgen
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* Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
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2007-10-17 03:51:39 -07:00
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* Copyright (C) 2001, 2004, 2007 Maciej W. Rozycki
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2005-04-16 15:20:36 -07:00
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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2009-06-19 06:05:26 -07:00
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#include <linux/smp.h>
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2005-04-16 15:20:36 -07:00
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#include <linux/mm.h>
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#include <asm/page.h>
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#include <asm/mmu_context.h>
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#include <asm/isadep.h>
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#include <asm/io.h>
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#include <asm/bootinfo.h>
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#include <asm/cpu.h>
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static unsigned long icache_size, dcache_size; /* Size in bytes */
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static unsigned long icache_lsize, dcache_lsize; /* Size in bytes */
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MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code
commit 3747069b25e419f6b51395f48127e9812abc3596 upstream.
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings. In any case, they are temporary and harmless.
Here, we remove all the MIPS __cpuinit from C code and __CPUINIT
from asm files. MIPS is interesting in this respect, because there
are also uasm users hiding behind their own renamed versions of the
__cpuinit macros.
[1] https://lkml.org/lkml/2013/5/20/589
[ralf@linux-mips.org: Folded in Paul's followup fix.]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5494/
Patchwork: https://patchwork.linux-mips.org/patch/5495/
Patchwork: https://patchwork.linux-mips.org/patch/5509/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-06-18 06:38:59 -07:00
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unsigned long r3k_cache_size(unsigned long ca_flags)
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2005-04-16 15:20:36 -07:00
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{
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unsigned long flags, status, dummy, size;
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volatile unsigned long *p;
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p = (volatile unsigned long *) KSEG0;
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flags = read_c0_status();
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/* isolate cache space */
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write_c0_status((ca_flags|flags)&~ST0_IEC);
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*p = 0xa5a55a5a;
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dummy = *p;
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status = read_c0_status();
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if (dummy != 0xa5a55a5a || (status & ST0_CM)) {
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size = 0;
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} else {
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for (size = 128; size <= 0x40000; size <<= 1)
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*(p + size) = 0;
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*p = -1;
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for (size = 128;
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(size <= 0x40000) && (*(p + size) == 0);
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size <<= 1)
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;
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if (size > 0x40000)
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size = 0;
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}
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write_c0_status(flags);
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return size * sizeof(*p);
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}
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|
MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code
commit 3747069b25e419f6b51395f48127e9812abc3596 upstream.
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings. In any case, they are temporary and harmless.
Here, we remove all the MIPS __cpuinit from C code and __CPUINIT
from asm files. MIPS is interesting in this respect, because there
are also uasm users hiding behind their own renamed versions of the
__cpuinit macros.
[1] https://lkml.org/lkml/2013/5/20/589
[ralf@linux-mips.org: Folded in Paul's followup fix.]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5494/
Patchwork: https://patchwork.linux-mips.org/patch/5495/
Patchwork: https://patchwork.linux-mips.org/patch/5509/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-06-18 06:38:59 -07:00
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unsigned long r3k_cache_lsize(unsigned long ca_flags)
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2005-04-16 15:20:36 -07:00
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{
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unsigned long flags, status, lsize, i;
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volatile unsigned long *p;
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p = (volatile unsigned long *) KSEG0;
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flags = read_c0_status();
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/* isolate cache space */
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write_c0_status((ca_flags|flags)&~ST0_IEC);
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for (i = 0; i < 128; i++)
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*(p + i) = 0;
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*(volatile unsigned char *)p = 0;
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for (lsize = 1; lsize < 128; lsize <<= 1) {
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*(p + lsize);
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status = read_c0_status();
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if (!(status & ST0_CM))
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break;
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}
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for (i = 0; i < 128; i += lsize)
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*(volatile unsigned char *)(p + i) = 0;
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write_c0_status(flags);
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return lsize * sizeof(*p);
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}
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|
MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code
commit 3747069b25e419f6b51395f48127e9812abc3596 upstream.
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings. In any case, they are temporary and harmless.
Here, we remove all the MIPS __cpuinit from C code and __CPUINIT
from asm files. MIPS is interesting in this respect, because there
are also uasm users hiding behind their own renamed versions of the
__cpuinit macros.
[1] https://lkml.org/lkml/2013/5/20/589
[ralf@linux-mips.org: Folded in Paul's followup fix.]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5494/
Patchwork: https://patchwork.linux-mips.org/patch/5495/
Patchwork: https://patchwork.linux-mips.org/patch/5509/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-06-18 06:38:59 -07:00
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static void r3k_probe_cache(void)
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2005-04-16 15:20:36 -07:00
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{
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dcache_size = r3k_cache_size(ST0_ISC);
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if (dcache_size)
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dcache_lsize = r3k_cache_lsize(ST0_ISC);
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icache_size = r3k_cache_size(ST0_ISC|ST0_SWC);
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if (icache_size)
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icache_lsize = r3k_cache_lsize(ST0_ISC|ST0_SWC);
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}
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static void r3k_flush_icache_range(unsigned long start, unsigned long end)
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{
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unsigned long size, i, flags;
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volatile unsigned char *p;
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size = end - start;
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if (size > icache_size || KSEGX(start) != KSEG0) {
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start = KSEG0;
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size = icache_size;
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}
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p = (char *)start;
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flags = read_c0_status();
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/* isolate cache space */
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write_c0_status((ST0_ISC|ST0_SWC|flags)&~ST0_IEC);
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for (i = 0; i < size; i += 0x080) {
|
2013-01-22 04:59:30 -07:00
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asm( "sb\t$0, 0x000(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
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"sb\t$0, 0x004(%0)\n\t"
|
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"sb\t$0, 0x008(%0)\n\t"
|
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"sb\t$0, 0x00c(%0)\n\t"
|
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"sb\t$0, 0x010(%0)\n\t"
|
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"sb\t$0, 0x014(%0)\n\t"
|
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"sb\t$0, 0x018(%0)\n\t"
|
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"sb\t$0, 0x01c(%0)\n\t"
|
2006-03-11 01:18:41 -07:00
|
|
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"sb\t$0, 0x020(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
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"sb\t$0, 0x024(%0)\n\t"
|
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|
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"sb\t$0, 0x028(%0)\n\t"
|
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|
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"sb\t$0, 0x02c(%0)\n\t"
|
|
|
|
"sb\t$0, 0x030(%0)\n\t"
|
|
|
|
"sb\t$0, 0x034(%0)\n\t"
|
|
|
|
"sb\t$0, 0x038(%0)\n\t"
|
|
|
|
"sb\t$0, 0x03c(%0)\n\t"
|
|
|
|
"sb\t$0, 0x040(%0)\n\t"
|
|
|
|
"sb\t$0, 0x044(%0)\n\t"
|
|
|
|
"sb\t$0, 0x048(%0)\n\t"
|
|
|
|
"sb\t$0, 0x04c(%0)\n\t"
|
|
|
|
"sb\t$0, 0x050(%0)\n\t"
|
|
|
|
"sb\t$0, 0x054(%0)\n\t"
|
|
|
|
"sb\t$0, 0x058(%0)\n\t"
|
|
|
|
"sb\t$0, 0x05c(%0)\n\t"
|
2006-03-11 01:18:41 -07:00
|
|
|
"sb\t$0, 0x060(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
|
|
"sb\t$0, 0x064(%0)\n\t"
|
|
|
|
"sb\t$0, 0x068(%0)\n\t"
|
|
|
|
"sb\t$0, 0x06c(%0)\n\t"
|
|
|
|
"sb\t$0, 0x070(%0)\n\t"
|
|
|
|
"sb\t$0, 0x074(%0)\n\t"
|
|
|
|
"sb\t$0, 0x078(%0)\n\t"
|
|
|
|
"sb\t$0, 0x07c(%0)\n\t"
|
|
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|
: : "r" (p) );
|
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|
p += 0x080;
|
|
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|
}
|
|
|
|
|
|
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|
write_c0_status(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void r3k_flush_dcache_range(unsigned long start, unsigned long end)
|
|
|
|
{
|
|
|
|
unsigned long size, i, flags;
|
|
|
|
volatile unsigned char *p;
|
|
|
|
|
|
|
|
size = end - start;
|
|
|
|
if (size > dcache_size || KSEGX(start) != KSEG0) {
|
|
|
|
start = KSEG0;
|
|
|
|
size = dcache_size;
|
|
|
|
}
|
|
|
|
p = (char *)start;
|
|
|
|
|
|
|
|
flags = read_c0_status();
|
|
|
|
|
|
|
|
/* isolate cache space */
|
|
|
|
write_c0_status((ST0_ISC|flags)&~ST0_IEC);
|
|
|
|
|
|
|
|
for (i = 0; i < size; i += 0x080) {
|
2013-01-22 04:59:30 -07:00
|
|
|
asm( "sb\t$0, 0x000(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
|
|
"sb\t$0, 0x004(%0)\n\t"
|
|
|
|
"sb\t$0, 0x008(%0)\n\t"
|
|
|
|
"sb\t$0, 0x00c(%0)\n\t"
|
2006-03-11 01:18:41 -07:00
|
|
|
"sb\t$0, 0x010(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
|
|
"sb\t$0, 0x014(%0)\n\t"
|
|
|
|
"sb\t$0, 0x018(%0)\n\t"
|
|
|
|
"sb\t$0, 0x01c(%0)\n\t"
|
2006-03-11 01:18:41 -07:00
|
|
|
"sb\t$0, 0x020(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
|
|
"sb\t$0, 0x024(%0)\n\t"
|
|
|
|
"sb\t$0, 0x028(%0)\n\t"
|
|
|
|
"sb\t$0, 0x02c(%0)\n\t"
|
2006-03-11 01:18:41 -07:00
|
|
|
"sb\t$0, 0x030(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
|
|
"sb\t$0, 0x034(%0)\n\t"
|
|
|
|
"sb\t$0, 0x038(%0)\n\t"
|
|
|
|
"sb\t$0, 0x03c(%0)\n\t"
|
2006-03-11 01:18:41 -07:00
|
|
|
"sb\t$0, 0x040(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
|
|
"sb\t$0, 0x044(%0)\n\t"
|
|
|
|
"sb\t$0, 0x048(%0)\n\t"
|
|
|
|
"sb\t$0, 0x04c(%0)\n\t"
|
2006-03-11 01:18:41 -07:00
|
|
|
"sb\t$0, 0x050(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
|
|
"sb\t$0, 0x054(%0)\n\t"
|
|
|
|
"sb\t$0, 0x058(%0)\n\t"
|
|
|
|
"sb\t$0, 0x05c(%0)\n\t"
|
2006-03-11 01:18:41 -07:00
|
|
|
"sb\t$0, 0x060(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
|
|
"sb\t$0, 0x064(%0)\n\t"
|
|
|
|
"sb\t$0, 0x068(%0)\n\t"
|
|
|
|
"sb\t$0, 0x06c(%0)\n\t"
|
2006-03-11 01:18:41 -07:00
|
|
|
"sb\t$0, 0x070(%0)\n\t"
|
2005-04-16 15:20:36 -07:00
|
|
|
"sb\t$0, 0x074(%0)\n\t"
|
|
|
|
"sb\t$0, 0x078(%0)\n\t"
|
|
|
|
"sb\t$0, 0x07c(%0)\n\t"
|
|
|
|
: : "r" (p) );
|
|
|
|
p += 0x080;
|
|
|
|
}
|
|
|
|
|
|
|
|
write_c0_status(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void r3k_flush_cache_all(void)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void r3k___flush_cache_all(void)
|
|
|
|
{
|
|
|
|
r3k_flush_dcache_range(KSEG0, KSEG0 + dcache_size);
|
|
|
|
r3k_flush_icache_range(KSEG0, KSEG0 + icache_size);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void r3k_flush_cache_mm(struct mm_struct *mm)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static void r3k_flush_cache_range(struct vm_area_struct *vma,
|
2007-10-17 03:51:39 -07:00
|
|
|
unsigned long start, unsigned long end)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
|
|
|
}
|
|
|
|
|
2007-10-17 03:51:39 -07:00
|
|
|
static void r3k_flush_cache_page(struct vm_area_struct *vma,
|
|
|
|
unsigned long addr, unsigned long pfn)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
2007-10-17 03:51:39 -07:00
|
|
|
unsigned long kaddr = KSEG0ADDR(pfn << PAGE_SHIFT);
|
|
|
|
int exec = vma->vm_flags & VM_EXEC;
|
|
|
|
struct mm_struct *mm = vma->vm_mm;
|
|
|
|
pmd_t *pmdp;
|
|
|
|
pte_t *ptep;
|
|
|
|
|
MIPS: Expand MIPS32 ASIDs to 64 bits
ASIDs have always been stored as unsigned longs, ie. 32 bits on MIPS32
kernels. This is problematic because it is feasible for the ASID version
to overflow & wrap around to zero.
We currently attempt to handle this overflow by simply setting the ASID
version to 1, using asid_first_version(), but we make no attempt to
account for the fact that there may be mm_structs with stale ASIDs that
have versions which we now reuse due to the overflow & wrap around.
Encountering this requires that:
1) A struct mm_struct X is active on CPU A using ASID (V,n).
2) That mm is not used on CPU A for the length of time that it takes
for CPU A's asid_cache to overflow & wrap around to the same
version V that the mm had in step 1. During this time tasks using
the mm could either be sleeping or only scheduled on other CPUs.
3) Some other mm Y becomes active on CPU A and is allocated the same
ASID (V,n).
4) mm X now becomes active on CPU A again, and now incorrectly has the
same ASID as mm Y.
Where struct mm_struct ASIDs are represented above in the format
(version, EntryHi.ASID), and on a typical MIPS32 system version will be
24 bits wide & EntryHi.ASID will be 8 bits wide.
The length of time required in step 2 is highly dependent upon the CPU &
workload, but for a hypothetical 2GHz CPU running a workload which
generates a new ASID every 10000 cycles this period is around 248 days.
Due to this long period of time & the fact that tasks need to be
scheduled in just the right (or wrong, depending upon your inclination)
way, this is obviously a difficult bug to encounter but it's entirely
possible as evidenced by reports.
In order to fix this, simply extend ASIDs to 64 bits even on MIPS32
builds. This will extend the period of time required for the
hypothetical system above to encounter the problem from 28 days to
around 3 trillion years, which feels safely outside of the realms of
possibility.
The cost of this is slightly more generated code in some commonly
executed paths, but this is pretty minimal:
| Code Size Gain | Percentage
-----------------------|----------------|-------------
decstation_defconfig | +270 | +0.00%
32r2el_defconfig | +652 | +0.01%
32r6el_defconfig | +1000 | +0.01%
I have been unable to measure any change in performance of the LMbench
lat_ctx or lat_proc tests resulting from the 64b ASIDs on either
32r2el_defconfig+interAptiv or 32r6el_defconfig+I6500 systems.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Suggested-by: James Hogan <jhogan@kernel.org>
References: https://lore.kernel.org/linux-mips/80B78A8B8FEE6145A87579E8435D78C30205D5F3@fzex.ruijie.com.cn/
References: https://lore.kernel.org/linux-mips/1488684260-18867-1-git-send-email-jiwei.sun@windriver.com/
Cc: Jiwei Sun <jiwei.sun@windriver.com>
Cc: Yu Huabing <yhb@ruijie.com.cn>
Cc: stable@vger.kernel.org # 2.6.12+
Cc: linux-mips@vger.kernel.org
2018-12-04 16:44:12 -07:00
|
|
|
pr_debug("cpage[%08llx,%08lx]\n",
|
2007-10-17 03:51:39 -07:00
|
|
|
cpu_context(smp_processor_id(), mm), addr);
|
|
|
|
|
|
|
|
/* No ASID => no such page in the cache. */
|
|
|
|
if (cpu_context(smp_processor_id(), mm) == 0)
|
|
|
|
return;
|
|
|
|
|
2020-06-08 21:33:05 -07:00
|
|
|
pmdp = pmd_off(mm, addr);
|
|
|
|
ptep = pte_offset_kernel(pmdp, addr);
|
2007-10-17 03:51:39 -07:00
|
|
|
|
|
|
|
/* Invalid => no such page in the cache. */
|
|
|
|
if (!(pte_val(*ptep) & _PAGE_PRESENT))
|
|
|
|
return;
|
|
|
|
|
|
|
|
r3k_flush_dcache_range(kaddr, kaddr + PAGE_SIZE);
|
|
|
|
if (exec)
|
|
|
|
r3k_flush_icache_range(kaddr, kaddr + PAGE_SIZE);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static void r3k_flush_data_cache_page(unsigned long addr)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
2011-06-17 08:20:28 -07:00
|
|
|
static void r3k_flush_kernel_vmap_range(unsigned long vaddr, int size)
|
|
|
|
{
|
|
|
|
BUG();
|
|
|
|
}
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
static void r3k_dma_cache_wback_inv(unsigned long start, unsigned long size)
|
|
|
|
{
|
|
|
|
/* Catch bad driver code */
|
|
|
|
BUG_ON(size == 0);
|
|
|
|
|
|
|
|
iob();
|
|
|
|
r3k_flush_dcache_range(start, start + size);
|
|
|
|
}
|
|
|
|
|
MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code
commit 3747069b25e419f6b51395f48127e9812abc3596 upstream.
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings. In any case, they are temporary and harmless.
Here, we remove all the MIPS __cpuinit from C code and __CPUINIT
from asm files. MIPS is interesting in this respect, because there
are also uasm users hiding behind their own renamed versions of the
__cpuinit macros.
[1] https://lkml.org/lkml/2013/5/20/589
[ralf@linux-mips.org: Folded in Paul's followup fix.]
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5494/
Patchwork: https://patchwork.linux-mips.org/patch/5495/
Patchwork: https://patchwork.linux-mips.org/patch/5509/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-06-18 06:38:59 -07:00
|
|
|
void r3k_cache_init(void)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
|
|
|
extern void build_clear_page(void);
|
|
|
|
extern void build_copy_page(void);
|
|
|
|
|
|
|
|
r3k_probe_cache();
|
|
|
|
|
|
|
|
flush_cache_all = r3k_flush_cache_all;
|
|
|
|
__flush_cache_all = r3k___flush_cache_all;
|
|
|
|
flush_cache_mm = r3k_flush_cache_mm;
|
|
|
|
flush_cache_range = r3k_flush_cache_range;
|
|
|
|
flush_cache_page = r3k_flush_cache_page;
|
|
|
|
flush_icache_range = r3k_flush_icache_range;
|
2008-08-04 11:53:57 -07:00
|
|
|
local_flush_icache_range = r3k_flush_icache_range;
|
2016-09-01 09:30:11 -07:00
|
|
|
__flush_icache_user_range = r3k_flush_icache_range;
|
|
|
|
__local_flush_icache_user_range = r3k_flush_icache_range;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2011-06-17 08:20:28 -07:00
|
|
|
__flush_kernel_vmap_range = r3k_flush_kernel_vmap_range;
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
flush_data_cache_page = r3k_flush_data_cache_page;
|
|
|
|
|
|
|
|
_dma_cache_wback_inv = r3k_dma_cache_wback_inv;
|
|
|
|
_dma_cache_wback = r3k_dma_cache_wback_inv;
|
|
|
|
_dma_cache_inv = r3k_dma_cache_wback_inv;
|
|
|
|
|
2020-02-27 22:52:38 -07:00
|
|
|
pr_info("Primary instruction cache %ldkB, linesize %ld bytes.\n",
|
2005-04-16 15:20:36 -07:00
|
|
|
icache_size >> 10, icache_lsize);
|
2020-02-27 22:52:38 -07:00
|
|
|
pr_info("Primary data cache %ldkB, linesize %ld bytes.\n",
|
2005-04-16 15:20:36 -07:00
|
|
|
dcache_size >> 10, dcache_lsize);
|
|
|
|
|
|
|
|
build_clear_page();
|
|
|
|
build_copy_page();
|
|
|
|
}
|