linux/arch/alpha/kernel/io.c
Greg Kroah-Hartman b24413180f 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>
2017-11-02 11:10:55 +01:00

632 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Alpha IO and memory functions.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/module.h>
#include <asm/io.h>
/* Out-of-line versions of the i/o routines that redirect into the
platform-specific version. Note that "platform-specific" may mean
"generic", which bumps through the machine vector. */
unsigned int
ioread8(void __iomem *addr)
{
unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
mb();
return ret;
}
unsigned int ioread16(void __iomem *addr)
{
unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
mb();
return ret;
}
unsigned int ioread32(void __iomem *addr)
{
unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
mb();
return ret;
}
void iowrite8(u8 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
mb();
}
void iowrite16(u16 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
mb();
}
void iowrite32(u32 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
mb();
}
EXPORT_SYMBOL(ioread8);
EXPORT_SYMBOL(ioread16);
EXPORT_SYMBOL(ioread32);
EXPORT_SYMBOL(iowrite8);
EXPORT_SYMBOL(iowrite16);
EXPORT_SYMBOL(iowrite32);
u8 inb(unsigned long port)
{
return ioread8(ioport_map(port, 1));
}
u16 inw(unsigned long port)
{
return ioread16(ioport_map(port, 2));
}
u32 inl(unsigned long port)
{
return ioread32(ioport_map(port, 4));
}
void outb(u8 b, unsigned long port)
{
iowrite8(b, ioport_map(port, 1));
}
void outw(u16 b, unsigned long port)
{
iowrite16(b, ioport_map(port, 2));
}
void outl(u32 b, unsigned long port)
{
iowrite32(b, ioport_map(port, 4));
}
EXPORT_SYMBOL(inb);
EXPORT_SYMBOL(inw);
EXPORT_SYMBOL(inl);
EXPORT_SYMBOL(outb);
EXPORT_SYMBOL(outw);
EXPORT_SYMBOL(outl);
u8 __raw_readb(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readb)(addr);
}
u16 __raw_readw(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readw)(addr);
}
u32 __raw_readl(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readl)(addr);
}
u64 __raw_readq(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readq)(addr);
}
void __raw_writeb(u8 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
}
void __raw_writew(u16 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writew)(b, addr);
}
void __raw_writel(u32 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writel)(b, addr);
}
void __raw_writeq(u64 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
}
EXPORT_SYMBOL(__raw_readb);
EXPORT_SYMBOL(__raw_readw);
EXPORT_SYMBOL(__raw_readl);
EXPORT_SYMBOL(__raw_readq);
EXPORT_SYMBOL(__raw_writeb);
EXPORT_SYMBOL(__raw_writew);
EXPORT_SYMBOL(__raw_writel);
EXPORT_SYMBOL(__raw_writeq);
u8 readb(const volatile void __iomem *addr)
{
u8 ret = __raw_readb(addr);
mb();
return ret;
}
u16 readw(const volatile void __iomem *addr)
{
u16 ret = __raw_readw(addr);
mb();
return ret;
}
u32 readl(const volatile void __iomem *addr)
{
u32 ret = __raw_readl(addr);
mb();
return ret;
}
u64 readq(const volatile void __iomem *addr)
{
u64 ret = __raw_readq(addr);
mb();
return ret;
}
void writeb(u8 b, volatile void __iomem *addr)
{
__raw_writeb(b, addr);
mb();
}
void writew(u16 b, volatile void __iomem *addr)
{
__raw_writew(b, addr);
mb();
}
void writel(u32 b, volatile void __iomem *addr)
{
__raw_writel(b, addr);
mb();
}
void writeq(u64 b, volatile void __iomem *addr)
{
__raw_writeq(b, addr);
mb();
}
EXPORT_SYMBOL(readb);
EXPORT_SYMBOL(readw);
EXPORT_SYMBOL(readl);
EXPORT_SYMBOL(readq);
EXPORT_SYMBOL(writeb);
EXPORT_SYMBOL(writew);
EXPORT_SYMBOL(writel);
EXPORT_SYMBOL(writeq);
/*
* Read COUNT 8-bit bytes from port PORT into memory starting at SRC.
*/
void ioread8_rep(void __iomem *port, void *dst, unsigned long count)
{
while ((unsigned long)dst & 0x3) {
if (!count)
return;
count--;
*(unsigned char *)dst = ioread8(port);
dst += 1;
}
while (count >= 4) {
unsigned int w;
count -= 4;
w = ioread8(port);
w |= ioread8(port) << 8;
w |= ioread8(port) << 16;
w |= ioread8(port) << 24;
*(unsigned int *)dst = w;
dst += 4;
}
while (count) {
--count;
*(unsigned char *)dst = ioread8(port);
dst += 1;
}
}
void insb(unsigned long port, void *dst, unsigned long count)
{
ioread8_rep(ioport_map(port, 1), dst, count);
}
EXPORT_SYMBOL(ioread8_rep);
EXPORT_SYMBOL(insb);
/*
* Read COUNT 16-bit words from port PORT into memory starting at
* SRC. SRC must be at least short aligned. This is used by the
* IDE driver to read disk sectors. Performance is important, but
* the interfaces seems to be slow: just using the inlined version
* of the inw() breaks things.
*/
void ioread16_rep(void __iomem *port, void *dst, unsigned long count)
{
if (unlikely((unsigned long)dst & 0x3)) {
if (!count)
return;
BUG_ON((unsigned long)dst & 0x1);
count--;
*(unsigned short *)dst = ioread16(port);
dst += 2;
}
while (count >= 2) {
unsigned int w;
count -= 2;
w = ioread16(port);
w |= ioread16(port) << 16;
*(unsigned int *)dst = w;
dst += 4;
}
if (count) {
*(unsigned short*)dst = ioread16(port);
}
}
void insw(unsigned long port, void *dst, unsigned long count)
{
ioread16_rep(ioport_map(port, 2), dst, count);
}
EXPORT_SYMBOL(ioread16_rep);
EXPORT_SYMBOL(insw);
/*
* Read COUNT 32-bit words from port PORT into memory starting at
* SRC. Now works with any alignment in SRC. Performance is important,
* but the interfaces seems to be slow: just using the inlined version
* of the inl() breaks things.
*/
void ioread32_rep(void __iomem *port, void *dst, unsigned long count)
{
if (unlikely((unsigned long)dst & 0x3)) {
while (count--) {
struct S { int x __attribute__((packed)); };
((struct S *)dst)->x = ioread32(port);
dst += 4;
}
} else {
/* Buffer 32-bit aligned. */
while (count--) {
*(unsigned int *)dst = ioread32(port);
dst += 4;
}
}
}
void insl(unsigned long port, void *dst, unsigned long count)
{
ioread32_rep(ioport_map(port, 4), dst, count);
}
EXPORT_SYMBOL(ioread32_rep);
EXPORT_SYMBOL(insl);
/*
* Like insb but in the opposite direction.
* Don't worry as much about doing aligned memory transfers:
* doing byte reads the "slow" way isn't nearly as slow as
* doing byte writes the slow way (no r-m-w cycle).
*/
void iowrite8_rep(void __iomem *port, const void *xsrc, unsigned long count)
{
const unsigned char *src = xsrc;
while (count--)
iowrite8(*src++, port);
}
void outsb(unsigned long port, const void *src, unsigned long count)
{
iowrite8_rep(ioport_map(port, 1), src, count);
}
EXPORT_SYMBOL(iowrite8_rep);
EXPORT_SYMBOL(outsb);
/*
* Like insw but in the opposite direction. This is used by the IDE
* driver to write disk sectors. Performance is important, but the
* interfaces seems to be slow: just using the inlined version of the
* outw() breaks things.
*/
void iowrite16_rep(void __iomem *port, const void *src, unsigned long count)
{
if (unlikely((unsigned long)src & 0x3)) {
if (!count)
return;
BUG_ON((unsigned long)src & 0x1);
iowrite16(*(unsigned short *)src, port);
src += 2;
--count;
}
while (count >= 2) {
unsigned int w;
count -= 2;
w = *(unsigned int *)src;
src += 4;
iowrite16(w >> 0, port);
iowrite16(w >> 16, port);
}
if (count) {
iowrite16(*(unsigned short *)src, port);
}
}
void outsw(unsigned long port, const void *src, unsigned long count)
{
iowrite16_rep(ioport_map(port, 2), src, count);
}
EXPORT_SYMBOL(iowrite16_rep);
EXPORT_SYMBOL(outsw);
/*
* Like insl but in the opposite direction. This is used by the IDE
* driver to write disk sectors. Works with any alignment in SRC.
* Performance is important, but the interfaces seems to be slow:
* just using the inlined version of the outl() breaks things.
*/
void iowrite32_rep(void __iomem *port, const void *src, unsigned long count)
{
if (unlikely((unsigned long)src & 0x3)) {
while (count--) {
struct S { int x __attribute__((packed)); };
iowrite32(((struct S *)src)->x, port);
src += 4;
}
} else {
/* Buffer 32-bit aligned. */
while (count--) {
iowrite32(*(unsigned int *)src, port);
src += 4;
}
}
}
void outsl(unsigned long port, const void *src, unsigned long count)
{
iowrite32_rep(ioport_map(port, 4), src, count);
}
EXPORT_SYMBOL(iowrite32_rep);
EXPORT_SYMBOL(outsl);
/*
* Copy data from IO memory space to "real" memory space.
* This needs to be optimized.
*/
void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
{
/* Optimize co-aligned transfers. Everything else gets handled
a byte at a time. */
if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
count -= 8;
do {
*(u64 *)to = __raw_readq(from);
count -= 8;
to += 8;
from += 8;
} while (count >= 0);
count += 8;
}
if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
count -= 4;
do {
*(u32 *)to = __raw_readl(from);
count -= 4;
to += 4;
from += 4;
} while (count >= 0);
count += 4;
}
if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
count -= 2;
do {
*(u16 *)to = __raw_readw(from);
count -= 2;
to += 2;
from += 2;
} while (count >= 0);
count += 2;
}
while (count > 0) {
*(u8 *) to = __raw_readb(from);
count--;
to++;
from++;
}
mb();
}
EXPORT_SYMBOL(memcpy_fromio);
/*
* Copy data from "real" memory space to IO memory space.
* This needs to be optimized.
*/
void memcpy_toio(volatile void __iomem *to, const void *from, long count)
{
/* Optimize co-aligned transfers. Everything else gets handled
a byte at a time. */
/* FIXME -- align FROM. */
if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
count -= 8;
do {
__raw_writeq(*(const u64 *)from, to);
count -= 8;
to += 8;
from += 8;
} while (count >= 0);
count += 8;
}
if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
count -= 4;
do {
__raw_writel(*(const u32 *)from, to);
count -= 4;
to += 4;
from += 4;
} while (count >= 0);
count += 4;
}
if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
count -= 2;
do {
__raw_writew(*(const u16 *)from, to);
count -= 2;
to += 2;
from += 2;
} while (count >= 0);
count += 2;
}
while (count > 0) {
__raw_writeb(*(const u8 *) from, to);
count--;
to++;
from++;
}
mb();
}
EXPORT_SYMBOL(memcpy_toio);
/*
* "memset" on IO memory space.
*/
void _memset_c_io(volatile void __iomem *to, unsigned long c, long count)
{
/* Handle any initial odd byte */
if (count > 0 && ((u64)to & 1)) {
__raw_writeb(c, to);
to++;
count--;
}
/* Handle any initial odd halfword */
if (count >= 2 && ((u64)to & 2)) {
__raw_writew(c, to);
to += 2;
count -= 2;
}
/* Handle any initial odd word */
if (count >= 4 && ((u64)to & 4)) {
__raw_writel(c, to);
to += 4;
count -= 4;
}
/* Handle all full-sized quadwords: we're aligned
(or have a small count) */
count -= 8;
if (count >= 0) {
do {
__raw_writeq(c, to);
to += 8;
count -= 8;
} while (count >= 0);
}
count += 8;
/* The tail is word-aligned if we still have count >= 4 */
if (count >= 4) {
__raw_writel(c, to);
to += 4;
count -= 4;
}
/* The tail is half-word aligned if we have count >= 2 */
if (count >= 2) {
__raw_writew(c, to);
to += 2;
count -= 2;
}
/* And finally, one last byte.. */
if (count) {
__raw_writeb(c, to);
}
mb();
}
EXPORT_SYMBOL(_memset_c_io);
/* A version of memcpy used by the vga console routines to move data around
arbitrarily between screen and main memory. */
void
scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
{
const u16 __iomem *ios = (const u16 __iomem *) s;
u16 __iomem *iod = (u16 __iomem *) d;
int s_isio = __is_ioaddr(s);
int d_isio = __is_ioaddr(d);
if (s_isio) {
if (d_isio) {
/* FIXME: Should handle unaligned ops and
operation widening. */
count /= 2;
while (count--) {
u16 tmp = __raw_readw(ios++);
__raw_writew(tmp, iod++);
}
}
else
memcpy_fromio(d, ios, count);
} else {
if (d_isio)
memcpy_toio(iod, s, count);
else
memcpy(d, s, count);
}
}
EXPORT_SYMBOL(scr_memcpyw);
void __iomem *ioport_map(unsigned long port, unsigned int size)
{
return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
}
void ioport_unmap(void __iomem *addr)
{
}
EXPORT_SYMBOL(ioport_map);
EXPORT_SYMBOL(ioport_unmap);