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 22:07:57 +08:00
|
|
|
/* SPDX-License-Identifier: GPL-2.0 */
|
2011-04-04 11:46:58 +08:00
|
|
|
/*
|
2016-02-25 02:51:11 +08:00
|
|
|
* Common definitions across all variants of ICP and ICS interrupt
|
2011-04-04 11:46:58 +08:00
|
|
|
* controllers.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#ifndef _XICS_H
|
|
|
|
|
#define _XICS_H
|
|
|
|
|
|
2011-04-15 06:31:58 +08:00
|
|
|
#include <linux/interrupt.h>
|
|
|
|
|
|
2011-04-04 11:46:58 +08:00
|
|
|
#define XICS_IPI 2
|
|
|
|
|
#define XICS_IRQ_SPURIOUS 0
|
|
|
|
|
|
|
|
|
|
/* Want a priority other than 0. Various HW issues require this. */
|
|
|
|
|
#define DEFAULT_PRIORITY 5
|
|
|
|
|
|
|
|
|
|
/*
|
2011-10-22 07:56:27 +08:00
|
|
|
* Mark IPIs as higher priority so we can take them inside interrupts
|
|
|
|
|
* FIXME: still true now?
|
2011-04-04 11:46:58 +08:00
|
|
|
*/
|
|
|
|
|
#define IPI_PRIORITY 4
|
|
|
|
|
|
|
|
|
|
/* The least favored priority */
|
|
|
|
|
#define LOWEST_PRIORITY 0xFF
|
|
|
|
|
|
|
|
|
|
/* The number of priorities defined above */
|
|
|
|
|
#define MAX_NUM_PRIORITIES 3
|
|
|
|
|
|
|
|
|
|
/* Native ICP */
|
2011-09-20 01:45:02 +08:00
|
|
|
#ifdef CONFIG_PPC_ICP_NATIVE
|
2011-04-04 11:46:58 +08:00
|
|
|
extern int icp_native_init(void);
|
powerpc/powernv: Don't call generic code on offline cpus
On PowerNV platforms, when a CPU is offline, we put it into nap mode.
It's possible that the CPU wakes up from nap mode while it is still
offline due to a stray IPI. A misdirected device interrupt could also
potentially cause it to wake up. In that circumstance, we need to clear
the interrupt so that the CPU can go back to nap mode.
In the past the clearing of the interrupt was accomplished by briefly
enabling interrupts and allowing the normal interrupt handling code
(do_IRQ() etc.) to handle the interrupt. This has the problem that
this code calls irq_enter() and irq_exit(), which call functions such
as account_system_vtime() which use RCU internally. Use of RCU is not
permitted on offline CPUs and will trigger errors if RCU checking is
enabled.
To avoid calling into any generic code which might use RCU, we adopt
a different method of clearing interrupts on offline CPUs. Since we
are on the PowerNV platform, we know that the system interrupt
controller is a XICS being driven directly (i.e. not via hcalls) by
the kernel. Hence this adds a new icp_native_flush_interrupt()
function to the native-mode XICS driver and arranges to call that
when an offline CPU is woken from nap. This new function reads the
interrupt from the XICS. If it is an IPI, it clears the IPI; if it
is a device interrupt, it prints a warning and disables the source.
Then it does the end-of-interrupt processing for the interrupt.
The other thing that briefly enabling interrupts did was to check and
clear the irq_happened flag in this CPU's PACA. Therefore, after
flushing the interrupt from the XICS, we also clear all bits except
the PACA_IRQ_HARD_DIS (interrupts are hard disabled) bit from the
irq_happened flag. The PACA_IRQ_HARD_DIS flag is set by power7_nap()
and is left set to indicate that interrupts are hard disabled. This
means we then have to ignore that flag in power7_nap(), which is
reasonable since it doesn't indicate that any interrupt event needs
servicing.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2014-09-02 12:23:16 +08:00
|
|
|
extern void icp_native_flush_interrupt(void);
|
2015-12-18 04:59:05 +08:00
|
|
|
extern void icp_native_cause_ipi_rm(int cpu);
|
2011-09-20 01:45:02 +08:00
|
|
|
#else
|
|
|
|
|
static inline int icp_native_init(void) { return -ENODEV; }
|
|
|
|
|
#endif
|
2011-04-04 11:46:58 +08:00
|
|
|
|
|
|
|
|
/* PAPR ICP */
|
2011-09-20 01:45:02 +08:00
|
|
|
#ifdef CONFIG_PPC_ICP_HV
|
2011-04-04 11:46:58 +08:00
|
|
|
extern int icp_hv_init(void);
|
2011-09-20 01:45:02 +08:00
|
|
|
#else
|
|
|
|
|
static inline int icp_hv_init(void) { return -ENODEV; }
|
|
|
|
|
#endif
|
2011-04-04 11:46:58 +08:00
|
|
|
|
2016-07-08 14:37:08 +08:00
|
|
|
#ifdef CONFIG_PPC_POWERNV
|
|
|
|
|
extern int icp_opal_init(void);
|
2017-02-07 08:35:31 +08:00
|
|
|
extern void icp_opal_flush_interrupt(void);
|
2016-07-08 14:37:08 +08:00
|
|
|
#else
|
|
|
|
|
static inline int icp_opal_init(void) { return -ENODEV; }
|
|
|
|
|
#endif
|
|
|
|
|
|
2011-04-04 11:46:58 +08:00
|
|
|
/* ICP ops */
|
|
|
|
|
struct icp_ops {
|
|
|
|
|
unsigned int (*get_irq)(void);
|
|
|
|
|
void (*eoi)(struct irq_data *d);
|
|
|
|
|
void (*set_priority)(unsigned char prio);
|
|
|
|
|
void (*teardown_cpu)(void);
|
|
|
|
|
void (*flush_ipi)(void);
|
|
|
|
|
#ifdef CONFIG_SMP
|
2017-04-13 18:16:21 +08:00
|
|
|
void (*cause_ipi)(int cpu);
|
2011-04-04 11:46:58 +08:00
|
|
|
irq_handler_t ipi_action;
|
|
|
|
|
#endif
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
extern const struct icp_ops *icp_ops;
|
|
|
|
|
|
|
|
|
|
/* Native ICS */
|
|
|
|
|
extern int ics_native_init(void);
|
|
|
|
|
|
|
|
|
|
/* RTAS ICS */
|
2011-09-20 01:45:02 +08:00
|
|
|
#ifdef CONFIG_PPC_ICS_RTAS
|
2011-04-04 11:46:58 +08:00
|
|
|
extern int ics_rtas_init(void);
|
2011-09-20 01:45:02 +08:00
|
|
|
#else
|
|
|
|
|
static inline int ics_rtas_init(void) { return -ENODEV; }
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* HAL ICS */
|
|
|
|
|
#ifdef CONFIG_PPC_POWERNV
|
|
|
|
|
extern int ics_opal_init(void);
|
|
|
|
|
#else
|
|
|
|
|
static inline int ics_opal_init(void) { return -ENODEV; }
|
|
|
|
|
#endif
|
2011-04-04 11:46:58 +08:00
|
|
|
|
|
|
|
|
/* ICS instance, hooked up to chip_data of an irq */
|
|
|
|
|
struct ics {
|
|
|
|
|
struct list_head link;
|
|
|
|
|
int (*map)(struct ics *ics, unsigned int virq);
|
|
|
|
|
void (*mask_unknown)(struct ics *ics, unsigned long vec);
|
|
|
|
|
long (*get_server)(struct ics *ics, unsigned long vec);
|
2011-04-15 06:31:59 +08:00
|
|
|
int (*host_match)(struct ics *ics, struct device_node *node);
|
2011-04-04 11:46:58 +08:00
|
|
|
char data[];
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/* Commons */
|
|
|
|
|
extern unsigned int xics_default_server;
|
|
|
|
|
extern unsigned int xics_default_distrib_server;
|
|
|
|
|
extern unsigned int xics_interrupt_server_size;
|
2012-02-15 05:06:50 +08:00
|
|
|
extern struct irq_domain *xics_host;
|
2011-04-04 11:46:58 +08:00
|
|
|
|
|
|
|
|
struct xics_cppr {
|
|
|
|
|
unsigned char stack[MAX_NUM_PRIORITIES];
|
|
|
|
|
int index;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
DECLARE_PER_CPU(struct xics_cppr, xics_cppr);
|
|
|
|
|
|
|
|
|
|
static inline void xics_push_cppr(unsigned int vec)
|
|
|
|
|
{
|
powerpc: Replace __get_cpu_var uses
This still has not been merged and now powerpc is the only arch that does
not have this change. Sorry about missing linuxppc-dev before.
V2->V2
- Fix up to work against 3.18-rc1
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
Signed-off-by: Christoph Lameter <cl@linux.com>
[mpe: Fix build errors caused by set/or_softirq_pending(), and rework
assignment in __set_breakpoint() to use memcpy().]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2014-10-22 04:23:25 +08:00
|
|
|
struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
|
2011-04-04 11:46:58 +08:00
|
|
|
|
|
|
|
|
if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1))
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
if (vec == XICS_IPI)
|
|
|
|
|
os_cppr->stack[++os_cppr->index] = IPI_PRIORITY;
|
|
|
|
|
else
|
|
|
|
|
os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline unsigned char xics_pop_cppr(void)
|
|
|
|
|
{
|
powerpc: Replace __get_cpu_var uses
This still has not been merged and now powerpc is the only arch that does
not have this change. Sorry about missing linuxppc-dev before.
V2->V2
- Fix up to work against 3.18-rc1
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
Signed-off-by: Christoph Lameter <cl@linux.com>
[mpe: Fix build errors caused by set/or_softirq_pending(), and rework
assignment in __set_breakpoint() to use memcpy().]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2014-10-22 04:23:25 +08:00
|
|
|
struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
|
2011-04-04 11:46:58 +08:00
|
|
|
|
|
|
|
|
if (WARN_ON(os_cppr->index < 1))
|
|
|
|
|
return LOWEST_PRIORITY;
|
|
|
|
|
|
|
|
|
|
return os_cppr->stack[--os_cppr->index];
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline void xics_set_base_cppr(unsigned char cppr)
|
|
|
|
|
{
|
powerpc: Replace __get_cpu_var uses
This still has not been merged and now powerpc is the only arch that does
not have this change. Sorry about missing linuxppc-dev before.
V2->V2
- Fix up to work against 3.18-rc1
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
Signed-off-by: Christoph Lameter <cl@linux.com>
[mpe: Fix build errors caused by set/or_softirq_pending(), and rework
assignment in __set_breakpoint() to use memcpy().]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2014-10-22 04:23:25 +08:00
|
|
|
struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
|
2011-04-04 11:46:58 +08:00
|
|
|
|
|
|
|
|
/* we only really want to set the priority when there's
|
|
|
|
|
* just one cppr value on the stack
|
|
|
|
|
*/
|
|
|
|
|
WARN_ON(os_cppr->index != 0);
|
|
|
|
|
|
|
|
|
|
os_cppr->stack[0] = cppr;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline unsigned char xics_cppr_top(void)
|
|
|
|
|
{
|
powerpc: Replace __get_cpu_var uses
This still has not been merged and now powerpc is the only arch that does
not have this change. Sorry about missing linuxppc-dev before.
V2->V2
- Fix up to work against 3.18-rc1
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
Signed-off-by: Christoph Lameter <cl@linux.com>
[mpe: Fix build errors caused by set/or_softirq_pending(), and rework
assignment in __set_breakpoint() to use memcpy().]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2014-10-22 04:23:25 +08:00
|
|
|
struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
|
2011-04-04 11:46:58 +08:00
|
|
|
|
|
|
|
|
return os_cppr->stack[os_cppr->index];
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message);
|
|
|
|
|
|
|
|
|
|
extern void xics_init(void);
|
|
|
|
|
extern void xics_setup_cpu(void);
|
|
|
|
|
extern void xics_update_irq_servers(void);
|
|
|
|
|
extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join);
|
|
|
|
|
extern void xics_mask_unknown_vec(unsigned int vec);
|
|
|
|
|
extern irqreturn_t xics_ipi_dispatch(int cpu);
|
2015-04-04 16:28:50 +08:00
|
|
|
extern void xics_smp_probe(void);
|
2011-04-04 11:46:58 +08:00
|
|
|
extern void xics_register_ics(struct ics *ics);
|
|
|
|
|
extern void xics_teardown_cpu(void);
|
|
|
|
|
extern void xics_kexec_teardown_cpu(int secondary);
|
|
|
|
|
extern void xics_migrate_irqs_away(void);
|
2013-04-26 03:20:59 +08:00
|
|
|
extern void icp_native_eoi(struct irq_data *d);
|
2016-08-02 10:39:43 +08:00
|
|
|
extern int xics_set_irq_type(struct irq_data *d, unsigned int flow_type);
|
|
|
|
|
extern int xics_retrigger(struct irq_data *data);
|
2011-04-04 11:46:58 +08:00
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
|
extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
|
|
|
|
|
unsigned int strict_check);
|
|
|
|
|
#else
|
|
|
|
|
#define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server)
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#endif /* _XICS_H */
|