2005-04-17 06:20:36 +08:00
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/*
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* arch/s390/kernel/smp.c
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*
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2009-06-16 16:30:52 +08:00
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* Copyright IBM Corp. 1999, 2009
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2005-04-17 06:20:36 +08:00
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* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
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2007-04-27 22:02:00 +08:00
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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* Heiko Carstens (heiko.carstens@de.ibm.com)
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2005-04-17 06:20:36 +08:00
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*
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2007-04-27 22:02:00 +08:00
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* based on other smp stuff by
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2005-04-17 06:20:36 +08:00
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* (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net>
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* (c) 1998 Ingo Molnar
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*
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* We work with logical cpu numbering everywhere we can. The only
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* functions using the real cpu address (got from STAP) are the sigp
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* functions. For all other functions we use the identity mapping.
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* That means that cpu_number_map[i] == i for every cpu. cpu_number_map is
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* used e.g. to find the idle task belonging to a logical cpu. Every array
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* in the kernel is sorted by the logical cpu number and not by the physical
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* one which is causing all the confusion with __cpu_logical_map and
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* cpu_number_map in other architectures.
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*/
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2008-12-25 20:39:50 +08:00
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#define KMSG_COMPONENT "cpu"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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2005-04-17 06:20:36 +08:00
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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2007-07-30 06:36:13 +08:00
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#include <linux/err.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/spinlock.h>
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#include <linux/kernel_stat.h>
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#include <linux/delay.h>
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#include <linux/cache.h>
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#include <linux/interrupt.h>
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2009-03-26 22:23:56 +08:00
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#include <linux/irqflags.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/cpu.h>
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2007-02-06 04:16:47 +08:00
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#include <linux/timex.h>
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2007-04-27 22:01:49 +08:00
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#include <linux/bootmem.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
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#include <linux/slab.h>
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2010-02-27 05:37:43 +08:00
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#include <asm/asm-offsets.h>
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2007-02-21 17:55:21 +08:00
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#include <asm/ipl.h>
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2007-02-06 04:16:47 +08:00
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#include <asm/setup.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/sigp.h>
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#include <asm/pgalloc.h>
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#include <asm/irq.h>
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#include <asm/s390_ext.h>
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#include <asm/cpcmd.h>
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#include <asm/tlbflush.h>
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2007-02-06 04:16:47 +08:00
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#include <asm/timer.h>
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2007-04-27 22:01:49 +08:00
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#include <asm/lowcore.h>
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2008-01-26 21:10:56 +08:00
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#include <asm/sclp.h>
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2009-06-12 16:26:21 +08:00
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#include <asm/cputime.h>
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2008-12-31 22:11:42 +08:00
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#include <asm/vdso.h>
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2009-09-11 16:29:03 +08:00
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#include <asm/cpu.h>
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2008-04-17 13:46:26 +08:00
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#include "entry.h"
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2005-04-17 06:20:36 +08:00
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2010-01-14 03:44:37 +08:00
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/* logical cpu to cpu address */
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2010-02-27 05:37:35 +08:00
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unsigned short __cpu_logical_map[NR_CPUS];
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2010-01-14 03:44:37 +08:00
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2005-04-17 06:20:36 +08:00
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static struct task_struct *current_set[NR_CPUS];
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2008-01-26 21:10:56 +08:00
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static u8 smp_cpu_type;
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static int smp_use_sigp_detection;
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enum s390_cpu_state {
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CPU_STATE_STANDBY,
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CPU_STATE_CONFIGURED,
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};
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2008-04-17 13:46:12 +08:00
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DEFINE_MUTEX(smp_cpu_state_mutex);
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2008-04-17 13:46:13 +08:00
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int smp_cpu_polarization[NR_CPUS];
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2008-01-26 21:10:56 +08:00
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static int smp_cpu_state[NR_CPUS];
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2008-04-17 13:46:13 +08:00
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static int cpu_management;
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2008-01-26 21:10:56 +08:00
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static DEFINE_PER_CPU(struct cpu, cpu_devices);
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2010-02-27 05:37:35 +08:00
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static void smp_ext_bitcall(int, int);
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2005-04-17 06:20:36 +08:00
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2010-02-27 05:37:35 +08:00
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static int raw_cpu_stopped(int cpu)
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2009-09-11 16:29:05 +08:00
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{
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2010-02-27 05:37:35 +08:00
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u32 status;
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2009-09-11 16:29:05 +08:00
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2010-02-27 05:37:35 +08:00
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switch (raw_sigp_ps(&status, 0, cpu, sigp_sense)) {
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2009-09-11 16:29:05 +08:00
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case sigp_status_stored:
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/* Check for stopped and check stop state */
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if (status & 0x50)
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return 1;
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break;
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default:
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break;
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}
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return 0;
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}
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2010-02-27 05:37:35 +08:00
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static inline int cpu_stopped(int cpu)
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{
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return raw_cpu_stopped(cpu_logical_map(cpu));
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}
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2010-02-27 05:37:34 +08:00
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void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
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{
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struct _lowcore *lc, *current_lc;
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struct stack_frame *sf;
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struct pt_regs *regs;
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unsigned long sp;
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if (smp_processor_id() == 0)
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func(data);
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__load_psw_mask(PSW_BASE_BITS | PSW_DEFAULT_KEY);
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/* Disable lowcore protection */
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__ctl_clear_bit(0, 28);
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current_lc = lowcore_ptr[smp_processor_id()];
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lc = lowcore_ptr[0];
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if (!lc)
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lc = current_lc;
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lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
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lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu;
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if (!cpu_online(0))
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smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]);
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2010-02-27 05:37:35 +08:00
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while (sigp(0, sigp_stop_and_store_status) == sigp_busy)
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2010-02-27 05:37:34 +08:00
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cpu_relax();
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sp = lc->panic_stack;
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sp -= sizeof(struct pt_regs);
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regs = (struct pt_regs *) sp;
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memcpy(®s->gprs, ¤t_lc->gpregs_save_area, sizeof(regs->gprs));
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2010-02-27 05:37:43 +08:00
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regs->psw = lc->psw_save_area;
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2010-02-27 05:37:34 +08:00
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sp -= STACK_FRAME_OVERHEAD;
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sf = (struct stack_frame *) sp;
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sf->back_chain = regs->gprs[15];
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smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]);
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}
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2007-11-20 18:13:37 +08:00
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void smp_send_stop(void)
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2005-04-17 06:20:36 +08:00
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{
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2007-04-27 22:02:00 +08:00
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int cpu, rc;
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2005-04-17 06:20:36 +08:00
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2007-11-20 18:13:37 +08:00
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/* Disable all interrupts/machine checks */
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__load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK);
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2009-03-26 22:23:56 +08:00
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trace_hardirqs_off();
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2005-04-17 06:20:36 +08:00
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2007-11-20 18:13:37 +08:00
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/* stop all processors */
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2005-04-17 06:20:36 +08:00
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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do {
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2010-02-27 05:37:35 +08:00
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rc = sigp(cpu, sigp_stop);
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2007-04-27 22:02:00 +08:00
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} while (rc == sigp_busy);
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2005-04-17 06:20:36 +08:00
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2009-09-11 16:29:05 +08:00
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while (!cpu_stopped(cpu))
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2006-12-04 22:40:33 +08:00
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cpu_relax();
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}
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}
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2005-04-17 06:20:36 +08:00
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/*
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* This is the main routine where commands issued by other
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* cpus are handled.
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*/
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2007-02-06 04:16:47 +08:00
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static void do_ext_call_interrupt(__u16 code)
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2005-04-17 06:20:36 +08:00
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{
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2007-04-27 22:02:00 +08:00
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unsigned long bits;
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2005-04-17 06:20:36 +08:00
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2007-04-27 22:02:00 +08:00
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/*
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* handle bit signal external calls
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*
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* For the ec_schedule signal we have to do nothing. All the work
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* is done automatically when we return from the interrupt.
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*/
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2005-04-17 06:20:36 +08:00
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bits = xchg(&S390_lowcore.ext_call_fast, 0);
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2007-04-27 22:02:00 +08:00
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if (test_bit(ec_call_function, &bits))
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2008-12-25 20:38:39 +08:00
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generic_smp_call_function_interrupt();
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if (test_bit(ec_call_function_single, &bits))
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generic_smp_call_function_single_interrupt();
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2005-04-17 06:20:36 +08:00
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}
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/*
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* Send an external call sigp to another cpu and return without waiting
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* for its completion.
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*/
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2010-02-27 05:37:35 +08:00
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static void smp_ext_bitcall(int cpu, int sig)
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2005-04-17 06:20:36 +08:00
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{
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2007-04-27 22:02:00 +08:00
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/*
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* Set signaling bit in lowcore of target cpu and kick it
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*/
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2005-04-17 06:20:36 +08:00
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set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);
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2010-02-27 05:37:35 +08:00
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while (sigp(cpu, sigp_emergency_signal) == sigp_busy)
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2005-04-17 06:20:36 +08:00
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udelay(10);
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}
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2009-09-24 23:34:45 +08:00
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void arch_send_call_function_ipi_mask(const struct cpumask *mask)
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2008-12-25 20:38:39 +08:00
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{
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int cpu;
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2009-09-24 23:34:45 +08:00
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for_each_cpu(cpu, mask)
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2008-12-25 20:38:39 +08:00
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smp_ext_bitcall(cpu, ec_call_function);
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}
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void arch_send_call_function_single_ipi(int cpu)
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{
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smp_ext_bitcall(cpu, ec_call_function_single);
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}
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2006-01-06 16:19:28 +08:00
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#ifndef CONFIG_64BIT
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2005-04-17 06:20:36 +08:00
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/*
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* this function sends a 'purge tlb' signal to another CPU.
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*/
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2008-04-17 13:46:26 +08:00
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static void smp_ptlb_callback(void *info)
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2005-04-17 06:20:36 +08:00
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{
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[S390] tlb flush fix.
The current tlb flushing code for page table entries violates the
s390 architecture in a small detail. The relevant section from the
principles of operation (SA22-7832-02 page 3-47):
"A valid table entry must not be changed while it is attached
to any CPU and may be used for translation by that CPU except to
(1) invalidate the entry by using INVALIDATE PAGE TABLE ENTRY or
INVALIDATE DAT TABLE ENTRY, (2) alter bits 56-63 of a page-table
entry, or (3) make a change by means of a COMPARE AND SWAP AND
PURGE instruction that purges the TLB."
That means if one thread of a multithreaded applciation uses a vma
while another thread does an unmap on it, the page table entries of
that vma needs to get removed with IPTE, IDTE or CSP. In some strange
and rare situations a cpu could check-stop (die) because a entry has
been pushed out of the TLB that is still needed to complete a
(milli-coded) instruction. I've never seen it happen with the current
code on any of the supported machines, so right now this is a
theoretical problem. But I want to fix it nevertheless, to avoid
headaches in the futures.
To get this implemented correctly without changing common code the
primitives ptep_get_and_clear, ptep_get_and_clear_full and
ptep_set_wrprotect need to use the IPTE instruction to invalidate the
pte before the new pte value gets stored. If IPTE is always used for
the three primitives three important operations will have a performace
hit: fork, mprotect and exit_mmap. Time for some workarounds:
* 1: ptep_get_and_clear_full is used in unmap_vmas to remove page
tables entries in a batched tlb gather operation. If the mmu_gather
context passed to unmap_vmas has been started with full_mm_flush==1
or if only one cpu is online or if the only user of a mm_struct is the
current process then the fullmm indication in the mmu_gather context is
set to one. All TLBs for mm_struct are flushed by the tlb_gather_mmu
call. No new TLBs can be created while the unmap is in progress. In
this case ptep_get_and_clear_full clears the ptes with a simple store.
* 2: ptep_get_and_clear is used in change_protection to clear the
ptes from the page tables before they are reentered with the new
access flags. At the end of the update flush_tlb_range clears the
remaining TLBs. In general the ptep_get_and_clear has to issue IPTE
for each pte and flush_tlb_range is a nop. But if there is only one
user of the mm_struct then ptep_get_and_clear uses simple stores
to do the update and flush_tlb_range will flush the TLBs.
* 3: Similar to 2, ptep_set_wrprotect is used in copy_page_range
for a fork to make all ptes of a cow mapping read-only. At the end of
of copy_page_range dup_mmap will flush the TLBs with a call to
flush_tlb_mm. Check for mm->mm_users and if there is only one user
avoid using IPTE in ptep_set_wrprotect and let flush_tlb_mm clear the
TLBs.
Overall for single threaded programs the tlb flush code now performs
better, for multi threaded programs it is slightly worse. In particular
exit_mmap() now does a single IDTE for the mm and then just frees every
page cache reference and every page table page directly without a delay
over the mmu_gather structure.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-10-22 18:52:44 +08:00
|
|
|
__tlb_flush_local();
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
void smp_ptlb_all(void)
|
|
|
|
{
|
2008-05-09 15:39:44 +08:00
|
|
|
on_each_cpu(smp_ptlb_callback, NULL, 1);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(smp_ptlb_all);
|
2006-01-06 16:19:28 +08:00
|
|
|
#endif /* ! CONFIG_64BIT */
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* this function sends a 'reschedule' IPI to another CPU.
|
|
|
|
* it goes straight through and wastes no time serializing
|
|
|
|
* anything. Worst case is that we lose a reschedule ...
|
|
|
|
*/
|
|
|
|
void smp_send_reschedule(int cpu)
|
|
|
|
{
|
2007-04-27 22:02:00 +08:00
|
|
|
smp_ext_bitcall(cpu, ec_schedule);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* parameter area for the set/clear control bit callbacks
|
|
|
|
*/
|
2006-09-28 22:56:43 +08:00
|
|
|
struct ec_creg_mask_parms {
|
2005-04-17 06:20:36 +08:00
|
|
|
unsigned long orvals[16];
|
|
|
|
unsigned long andvals[16];
|
2006-09-28 22:56:43 +08:00
|
|
|
};
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* callback for setting/clearing control bits
|
|
|
|
*/
|
2007-04-27 22:02:00 +08:00
|
|
|
static void smp_ctl_bit_callback(void *info)
|
|
|
|
{
|
2006-09-28 22:56:43 +08:00
|
|
|
struct ec_creg_mask_parms *pp = info;
|
2005-04-17 06:20:36 +08:00
|
|
|
unsigned long cregs[16];
|
|
|
|
int i;
|
2007-04-27 22:02:00 +08:00
|
|
|
|
2006-09-28 22:56:43 +08:00
|
|
|
__ctl_store(cregs, 0, 15);
|
|
|
|
for (i = 0; i <= 15; i++)
|
2005-04-17 06:20:36 +08:00
|
|
|
cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i];
|
2006-09-28 22:56:43 +08:00
|
|
|
__ctl_load(cregs, 0, 15);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set a bit in a control register of all cpus
|
|
|
|
*/
|
2006-09-28 22:56:43 +08:00
|
|
|
void smp_ctl_set_bit(int cr, int bit)
|
|
|
|
{
|
|
|
|
struct ec_creg_mask_parms parms;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2006-09-28 22:56:43 +08:00
|
|
|
memset(&parms.orvals, 0, sizeof(parms.orvals));
|
|
|
|
memset(&parms.andvals, 0xff, sizeof(parms.andvals));
|
2005-04-17 06:20:36 +08:00
|
|
|
parms.orvals[cr] = 1 << bit;
|
2008-05-09 15:39:44 +08:00
|
|
|
on_each_cpu(smp_ctl_bit_callback, &parms, 1);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-04-27 22:02:00 +08:00
|
|
|
EXPORT_SYMBOL(smp_ctl_set_bit);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Clear a bit in a control register of all cpus
|
|
|
|
*/
|
2006-09-28 22:56:43 +08:00
|
|
|
void smp_ctl_clear_bit(int cr, int bit)
|
|
|
|
{
|
|
|
|
struct ec_creg_mask_parms parms;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2006-09-28 22:56:43 +08:00
|
|
|
memset(&parms.orvals, 0, sizeof(parms.orvals));
|
|
|
|
memset(&parms.andvals, 0xff, sizeof(parms.andvals));
|
2005-04-17 06:20:36 +08:00
|
|
|
parms.andvals[cr] = ~(1L << bit);
|
2008-05-09 15:39:44 +08:00
|
|
|
on_each_cpu(smp_ctl_bit_callback, &parms, 1);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-04-27 22:02:00 +08:00
|
|
|
EXPORT_SYMBOL(smp_ctl_clear_bit);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2009-03-26 22:24:46 +08:00
|
|
|
#ifdef CONFIG_ZFCPDUMP
|
2007-04-27 22:01:49 +08:00
|
|
|
|
2007-07-10 17:24:13 +08:00
|
|
|
static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
|
2007-04-27 22:01:49 +08:00
|
|
|
{
|
|
|
|
if (ipl_info.type != IPL_TYPE_FCP_DUMP)
|
|
|
|
return;
|
2007-07-10 17:24:13 +08:00
|
|
|
if (cpu >= NR_CPUS) {
|
2008-12-25 20:39:50 +08:00
|
|
|
pr_warning("CPU %i exceeds the maximum %i and is excluded from "
|
|
|
|
"the dump\n", cpu, NR_CPUS - 1);
|
2007-07-10 17:24:13 +08:00
|
|
|
return;
|
2007-04-27 22:01:49 +08:00
|
|
|
}
|
2010-02-27 05:37:32 +08:00
|
|
|
zfcpdump_save_areas[cpu] = kmalloc(sizeof(struct save_area), GFP_KERNEL);
|
2010-02-27 05:37:35 +08:00
|
|
|
while (raw_sigp(phy_cpu, sigp_stop_and_store_status) == sigp_busy)
|
2007-07-10 17:24:13 +08:00
|
|
|
cpu_relax();
|
2010-03-24 18:49:50 +08:00
|
|
|
memcpy_real(zfcpdump_save_areas[cpu],
|
|
|
|
(void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
|
|
|
|
sizeof(struct save_area));
|
2007-04-27 22:01:49 +08:00
|
|
|
}
|
|
|
|
|
2010-02-27 05:37:32 +08:00
|
|
|
struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
|
2007-04-27 22:01:49 +08:00
|
|
|
EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
|
|
|
|
|
|
|
|
#else
|
2007-07-10 17:24:13 +08:00
|
|
|
|
|
|
|
static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { }
|
|
|
|
|
2009-03-26 22:24:46 +08:00
|
|
|
#endif /* CONFIG_ZFCPDUMP */
|
2007-04-27 22:01:49 +08:00
|
|
|
|
2008-01-26 21:10:56 +08:00
|
|
|
static int cpu_known(int cpu_id)
|
|
|
|
{
|
|
|
|
int cpu;
|
|
|
|
|
|
|
|
for_each_present_cpu(cpu) {
|
|
|
|
if (__cpu_logical_map[cpu] == cpu_id)
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int smp_rescan_cpus_sigp(cpumask_t avail)
|
|
|
|
{
|
|
|
|
int cpu_id, logical_cpu;
|
|
|
|
|
2009-03-26 22:24:59 +08:00
|
|
|
logical_cpu = cpumask_first(&avail);
|
|
|
|
if (logical_cpu >= nr_cpu_ids)
|
2008-01-26 21:10:56 +08:00
|
|
|
return 0;
|
2009-09-11 16:29:03 +08:00
|
|
|
for (cpu_id = 0; cpu_id <= MAX_CPU_ADDRESS; cpu_id++) {
|
2008-01-26 21:10:56 +08:00
|
|
|
if (cpu_known(cpu_id))
|
|
|
|
continue;
|
|
|
|
__cpu_logical_map[logical_cpu] = cpu_id;
|
2008-04-17 13:46:13 +08:00
|
|
|
smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
|
2008-01-26 21:10:56 +08:00
|
|
|
if (!cpu_stopped(logical_cpu))
|
|
|
|
continue;
|
|
|
|
cpu_set(logical_cpu, cpu_present_map);
|
|
|
|
smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
|
2009-03-26 22:24:59 +08:00
|
|
|
logical_cpu = cpumask_next(logical_cpu, &avail);
|
|
|
|
if (logical_cpu >= nr_cpu_ids)
|
2008-01-26 21:10:56 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-01-26 21:11:05 +08:00
|
|
|
static int smp_rescan_cpus_sclp(cpumask_t avail)
|
2008-01-26 21:10:56 +08:00
|
|
|
{
|
|
|
|
struct sclp_cpu_info *info;
|
|
|
|
int cpu_id, logical_cpu, cpu;
|
|
|
|
int rc;
|
|
|
|
|
2009-03-26 22:24:59 +08:00
|
|
|
logical_cpu = cpumask_first(&avail);
|
|
|
|
if (logical_cpu >= nr_cpu_ids)
|
2008-01-26 21:10:56 +08:00
|
|
|
return 0;
|
2008-01-26 21:11:05 +08:00
|
|
|
info = kmalloc(sizeof(*info), GFP_KERNEL);
|
2008-01-26 21:10:56 +08:00
|
|
|
if (!info)
|
|
|
|
return -ENOMEM;
|
|
|
|
rc = sclp_get_cpu_info(info);
|
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
for (cpu = 0; cpu < info->combined; cpu++) {
|
|
|
|
if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
|
|
|
|
continue;
|
|
|
|
cpu_id = info->cpu[cpu].address;
|
|
|
|
if (cpu_known(cpu_id))
|
|
|
|
continue;
|
|
|
|
__cpu_logical_map[logical_cpu] = cpu_id;
|
2008-04-17 13:46:13 +08:00
|
|
|
smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
|
2008-01-26 21:10:56 +08:00
|
|
|
cpu_set(logical_cpu, cpu_present_map);
|
|
|
|
if (cpu >= info->configured)
|
|
|
|
smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY;
|
|
|
|
else
|
|
|
|
smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
|
2009-03-26 22:24:59 +08:00
|
|
|
logical_cpu = cpumask_next(logical_cpu, &avail);
|
|
|
|
if (logical_cpu >= nr_cpu_ids)
|
2008-01-26 21:10:56 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
out:
|
2008-01-26 21:11:05 +08:00
|
|
|
kfree(info);
|
2008-01-26 21:10:56 +08:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2008-04-30 19:38:37 +08:00
|
|
|
static int __smp_rescan_cpus(void)
|
2008-01-26 21:10:56 +08:00
|
|
|
{
|
|
|
|
cpumask_t avail;
|
|
|
|
|
2008-01-26 21:11:05 +08:00
|
|
|
cpus_xor(avail, cpu_possible_map, cpu_present_map);
|
2008-01-26 21:10:56 +08:00
|
|
|
if (smp_use_sigp_detection)
|
|
|
|
return smp_rescan_cpus_sigp(avail);
|
|
|
|
else
|
|
|
|
return smp_rescan_cpus_sclp(avail);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-01-26 21:11:05 +08:00
|
|
|
static void __init smp_detect_cpus(void)
|
|
|
|
{
|
|
|
|
unsigned int cpu, c_cpus, s_cpus;
|
|
|
|
struct sclp_cpu_info *info;
|
|
|
|
u16 boot_cpu_addr, cpu_addr;
|
|
|
|
|
|
|
|
c_cpus = 1;
|
|
|
|
s_cpus = 0;
|
2009-03-26 22:24:42 +08:00
|
|
|
boot_cpu_addr = __cpu_logical_map[0];
|
2008-01-26 21:11:05 +08:00
|
|
|
info = kmalloc(sizeof(*info), GFP_KERNEL);
|
|
|
|
if (!info)
|
|
|
|
panic("smp_detect_cpus failed to allocate memory\n");
|
|
|
|
/* Use sigp detection algorithm if sclp doesn't work. */
|
|
|
|
if (sclp_get_cpu_info(info)) {
|
|
|
|
smp_use_sigp_detection = 1;
|
2009-09-11 16:29:03 +08:00
|
|
|
for (cpu = 0; cpu <= MAX_CPU_ADDRESS; cpu++) {
|
2008-01-26 21:11:05 +08:00
|
|
|
if (cpu == boot_cpu_addr)
|
|
|
|
continue;
|
2010-02-27 05:37:35 +08:00
|
|
|
if (!raw_cpu_stopped(cpu))
|
2008-01-26 21:11:05 +08:00
|
|
|
continue;
|
|
|
|
smp_get_save_area(c_cpus, cpu);
|
|
|
|
c_cpus++;
|
|
|
|
}
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (info->has_cpu_type) {
|
|
|
|
for (cpu = 0; cpu < info->combined; cpu++) {
|
|
|
|
if (info->cpu[cpu].address == boot_cpu_addr) {
|
|
|
|
smp_cpu_type = info->cpu[cpu].type;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
for (cpu = 0; cpu < info->combined; cpu++) {
|
|
|
|
if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
|
|
|
|
continue;
|
|
|
|
cpu_addr = info->cpu[cpu].address;
|
|
|
|
if (cpu_addr == boot_cpu_addr)
|
|
|
|
continue;
|
2010-02-27 05:37:35 +08:00
|
|
|
if (!raw_cpu_stopped(cpu_addr)) {
|
2008-01-26 21:11:05 +08:00
|
|
|
s_cpus++;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
smp_get_save_area(c_cpus, cpu_addr);
|
|
|
|
c_cpus++;
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
kfree(info);
|
2008-12-25 20:39:50 +08:00
|
|
|
pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus);
|
2008-01-26 21:11:31 +08:00
|
|
|
get_online_cpus();
|
2008-04-30 19:38:37 +08:00
|
|
|
__smp_rescan_cpus();
|
2008-01-26 21:11:31 +08:00
|
|
|
put_online_cpus();
|
2008-01-26 21:11:05 +08:00
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
2007-04-27 22:02:00 +08:00
|
|
|
* Activate a secondary processor.
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2007-05-31 23:38:05 +08:00
|
|
|
int __cpuinit start_secondary(void *cpuvoid)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2007-04-27 22:02:00 +08:00
|
|
|
/* Setup the cpu */
|
|
|
|
cpu_init();
|
2005-11-09 13:39:01 +08:00
|
|
|
preempt_disable();
|
2007-02-06 04:18:19 +08:00
|
|
|
/* Enable TOD clock interrupts on the secondary cpu. */
|
2007-04-27 22:02:00 +08:00
|
|
|
init_cpu_timer();
|
2007-02-06 04:18:19 +08:00
|
|
|
/* Enable cpu timer interrupts on the secondary cpu. */
|
2007-04-27 22:02:00 +08:00
|
|
|
init_cpu_vtimer();
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Enable pfault pseudo page faults on this cpu. */
|
2006-12-04 22:40:40 +08:00
|
|
|
pfault_init();
|
|
|
|
|
2008-09-07 22:57:22 +08:00
|
|
|
/* call cpu notifiers */
|
|
|
|
notify_cpu_starting(smp_processor_id());
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Mark this cpu as online */
|
2008-12-25 20:38:39 +08:00
|
|
|
ipi_call_lock();
|
2005-04-17 06:20:36 +08:00
|
|
|
cpu_set(smp_processor_id(), cpu_online_map);
|
2008-12-25 20:38:39 +08:00
|
|
|
ipi_call_unlock();
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Switch on interrupts */
|
|
|
|
local_irq_enable();
|
2007-04-27 22:02:00 +08:00
|
|
|
/* Print info about this processor */
|
2009-03-26 22:24:42 +08:00
|
|
|
print_cpu_info();
|
2007-04-27 22:02:00 +08:00
|
|
|
/* cpu_idle will call schedule for us */
|
|
|
|
cpu_idle();
|
|
|
|
return 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __init smp_create_idle(unsigned int cpu)
|
|
|
|
{
|
|
|
|
struct task_struct *p;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* don't care about the psw and regs settings since we'll never
|
|
|
|
* reschedule the forked task.
|
|
|
|
*/
|
|
|
|
p = fork_idle(cpu);
|
|
|
|
if (IS_ERR(p))
|
|
|
|
panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p));
|
|
|
|
current_set[cpu] = p;
|
|
|
|
}
|
|
|
|
|
2008-01-26 21:11:14 +08:00
|
|
|
static int __cpuinit smp_alloc_lowcore(int cpu)
|
|
|
|
{
|
|
|
|
unsigned long async_stack, panic_stack;
|
|
|
|
struct _lowcore *lowcore;
|
|
|
|
|
2009-09-23 04:58:49 +08:00
|
|
|
lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
|
2008-01-26 21:11:14 +08:00
|
|
|
if (!lowcore)
|
|
|
|
return -ENOMEM;
|
|
|
|
async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
|
|
|
|
panic_stack = __get_free_page(GFP_KERNEL);
|
2008-02-19 22:29:29 +08:00
|
|
|
if (!panic_stack || !async_stack)
|
|
|
|
goto out;
|
2008-03-05 19:37:09 +08:00
|
|
|
memcpy(lowcore, &S390_lowcore, 512);
|
|
|
|
memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512);
|
2008-01-26 21:11:14 +08:00
|
|
|
lowcore->async_stack = async_stack + ASYNC_SIZE;
|
|
|
|
lowcore->panic_stack = panic_stack + PAGE_SIZE;
|
|
|
|
|
|
|
|
#ifndef CONFIG_64BIT
|
|
|
|
if (MACHINE_HAS_IEEE) {
|
|
|
|
unsigned long save_area;
|
|
|
|
|
|
|
|
save_area = get_zeroed_page(GFP_KERNEL);
|
|
|
|
if (!save_area)
|
2008-12-25 20:39:27 +08:00
|
|
|
goto out;
|
2008-01-26 21:11:14 +08:00
|
|
|
lowcore->extended_save_area_addr = (u32) save_area;
|
|
|
|
}
|
2008-12-31 22:11:42 +08:00
|
|
|
#else
|
|
|
|
if (vdso_alloc_per_cpu(cpu, lowcore))
|
|
|
|
goto out;
|
2008-01-26 21:11:14 +08:00
|
|
|
#endif
|
|
|
|
lowcore_ptr[cpu] = lowcore;
|
|
|
|
return 0;
|
|
|
|
|
2008-02-19 22:29:29 +08:00
|
|
|
out:
|
2008-12-25 20:39:27 +08:00
|
|
|
free_page(panic_stack);
|
2008-01-26 21:11:14 +08:00
|
|
|
free_pages(async_stack, ASYNC_ORDER);
|
2009-09-23 04:58:49 +08:00
|
|
|
free_pages((unsigned long) lowcore, LC_ORDER);
|
2008-01-26 21:11:14 +08:00
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void smp_free_lowcore(int cpu)
|
|
|
|
{
|
|
|
|
struct _lowcore *lowcore;
|
|
|
|
|
|
|
|
lowcore = lowcore_ptr[cpu];
|
|
|
|
#ifndef CONFIG_64BIT
|
|
|
|
if (MACHINE_HAS_IEEE)
|
|
|
|
free_page((unsigned long) lowcore->extended_save_area_addr);
|
2008-12-31 22:11:42 +08:00
|
|
|
#else
|
|
|
|
vdso_free_per_cpu(cpu, lowcore);
|
2008-01-26 21:11:14 +08:00
|
|
|
#endif
|
|
|
|
free_page(lowcore->panic_stack - PAGE_SIZE);
|
|
|
|
free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER);
|
2009-09-23 04:58:49 +08:00
|
|
|
free_pages((unsigned long) lowcore, LC_ORDER);
|
2008-01-26 21:11:14 +08:00
|
|
|
lowcore_ptr[cpu] = NULL;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Upping and downing of CPUs */
|
2008-01-26 21:11:14 +08:00
|
|
|
int __cpuinit __cpu_up(unsigned int cpu)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2007-04-27 22:02:00 +08:00
|
|
|
struct _lowcore *cpu_lowcore;
|
2010-02-27 05:37:35 +08:00
|
|
|
struct task_struct *idle;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct stack_frame *sf;
|
2009-03-26 22:24:53 +08:00
|
|
|
u32 lowcore;
|
2010-02-27 05:37:35 +08:00
|
|
|
int ccode;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-01-26 21:10:56 +08:00
|
|
|
if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED)
|
|
|
|
return -EIO;
|
2008-01-26 21:11:14 +08:00
|
|
|
if (smp_alloc_lowcore(cpu))
|
|
|
|
return -ENOMEM;
|
2009-03-26 22:24:53 +08:00
|
|
|
do {
|
2010-02-27 05:37:35 +08:00
|
|
|
ccode = sigp(cpu, sigp_initial_cpu_reset);
|
2009-03-26 22:24:53 +08:00
|
|
|
if (ccode == sigp_busy)
|
|
|
|
udelay(10);
|
|
|
|
if (ccode == sigp_not_operational)
|
|
|
|
goto err_out;
|
|
|
|
} while (ccode == sigp_busy);
|
|
|
|
|
|
|
|
lowcore = (u32)(unsigned long)lowcore_ptr[cpu];
|
2010-02-27 05:37:35 +08:00
|
|
|
while (sigp_p(lowcore, cpu, sigp_set_prefix) == sigp_busy)
|
2009-03-26 22:24:53 +08:00
|
|
|
udelay(10);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
idle = current_set[cpu];
|
2007-04-27 22:02:00 +08:00
|
|
|
cpu_lowcore = lowcore_ptr[cpu];
|
2005-04-17 06:20:36 +08:00
|
|
|
cpu_lowcore->kernel_stack = (unsigned long)
|
2007-04-27 22:02:00 +08:00
|
|
|
task_stack_page(idle) + THREAD_SIZE;
|
2008-01-26 21:11:14 +08:00
|
|
|
cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle);
|
2005-04-17 06:20:36 +08:00
|
|
|
sf = (struct stack_frame *) (cpu_lowcore->kernel_stack
|
|
|
|
- sizeof(struct pt_regs)
|
|
|
|
- sizeof(struct stack_frame));
|
|
|
|
memset(sf, 0, sizeof(struct stack_frame));
|
|
|
|
sf->gprs[9] = (unsigned long) sf;
|
|
|
|
cpu_lowcore->save_area[15] = (unsigned long) sf;
|
2008-06-10 16:03:23 +08:00
|
|
|
__ctl_store(cpu_lowcore->cregs_save_area, 0, 15);
|
2006-09-28 22:56:43 +08:00
|
|
|
asm volatile(
|
|
|
|
" stam 0,15,0(%0)"
|
|
|
|
: : "a" (&cpu_lowcore->access_regs_save_area) : "memory");
|
2005-04-17 06:20:36 +08:00
|
|
|
cpu_lowcore->percpu_offset = __per_cpu_offset[cpu];
|
2007-04-27 22:02:00 +08:00
|
|
|
cpu_lowcore->current_task = (unsigned long) idle;
|
2009-03-26 22:24:42 +08:00
|
|
|
cpu_lowcore->cpu_nr = cpu;
|
2008-02-19 22:29:29 +08:00
|
|
|
cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce;
|
2009-04-14 21:36:16 +08:00
|
|
|
cpu_lowcore->machine_flags = S390_lowcore.machine_flags;
|
2009-06-12 16:26:44 +08:00
|
|
|
cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func;
|
2005-04-17 06:20:36 +08:00
|
|
|
eieio();
|
2006-03-24 19:15:17 +08:00
|
|
|
|
2010-02-27 05:37:35 +08:00
|
|
|
while (sigp(cpu, sigp_restart) == sigp_busy)
|
2006-03-24 19:15:17 +08:00
|
|
|
udelay(10);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
while (!cpu_online(cpu))
|
|
|
|
cpu_relax();
|
|
|
|
return 0;
|
2009-03-26 22:24:53 +08:00
|
|
|
|
|
|
|
err_out:
|
|
|
|
smp_free_lowcore(cpu);
|
|
|
|
return -EIO;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-01-26 21:11:05 +08:00
|
|
|
static int __init setup_possible_cpus(char *s)
|
2006-02-18 05:52:46 +08:00
|
|
|
{
|
2008-01-26 21:11:05 +08:00
|
|
|
int pcpus, cpu;
|
2006-02-18 05:52:46 +08:00
|
|
|
|
2008-01-26 21:11:05 +08:00
|
|
|
pcpus = simple_strtoul(s, NULL, 0);
|
2009-04-14 21:36:25 +08:00
|
|
|
init_cpu_possible(cpumask_of(0));
|
|
|
|
for (cpu = 1; cpu < pcpus && cpu < nr_cpu_ids; cpu++)
|
2009-03-26 22:25:00 +08:00
|
|
|
set_cpu_possible(cpu, true);
|
2006-02-18 05:52:47 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
early_param("possible_cpus", setup_possible_cpus);
|
|
|
|
|
2008-01-26 21:11:05 +08:00
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
|
2007-04-27 22:02:00 +08:00
|
|
|
int __cpu_disable(void)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2006-09-28 22:56:43 +08:00
|
|
|
struct ec_creg_mask_parms cr_parms;
|
2005-06-26 05:54:50 +08:00
|
|
|
int cpu = smp_processor_id();
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2005-06-26 05:54:50 +08:00
|
|
|
cpu_clear(cpu, cpu_online_map);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/* Disable pfault pseudo page faults on this cpu. */
|
2006-12-04 22:40:40 +08:00
|
|
|
pfault_fini();
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2006-09-28 22:56:43 +08:00
|
|
|
memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals));
|
|
|
|
memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals));
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2006-09-28 22:56:43 +08:00
|
|
|
/* disable all external interrupts */
|
2005-04-17 06:20:36 +08:00
|
|
|
cr_parms.orvals[0] = 0;
|
2007-04-27 22:02:00 +08:00
|
|
|
cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 |
|
|
|
|
1 << 11 | 1 << 10 | 1 << 6 | 1 << 4);
|
2005-04-17 06:20:36 +08:00
|
|
|
/* disable all I/O interrupts */
|
|
|
|
cr_parms.orvals[6] = 0;
|
2007-04-27 22:02:00 +08:00
|
|
|
cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
|
|
|
|
1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
|
2005-04-17 06:20:36 +08:00
|
|
|
/* disable most machine checks */
|
|
|
|
cr_parms.orvals[14] = 0;
|
2007-04-27 22:02:00 +08:00
|
|
|
cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
|
|
|
|
1 << 25 | 1 << 24);
|
2006-09-28 22:56:43 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
smp_ctl_bit_callback(&cr_parms);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-04-27 22:02:00 +08:00
|
|
|
void __cpu_die(unsigned int cpu)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
/* Wait until target cpu is down */
|
2009-09-11 16:29:05 +08:00
|
|
|
while (!cpu_stopped(cpu))
|
2005-04-17 06:20:36 +08:00
|
|
|
cpu_relax();
|
2010-02-27 05:37:35 +08:00
|
|
|
while (sigp_p(0, cpu, sigp_set_prefix) == sigp_busy)
|
2009-10-29 22:04:09 +08:00
|
|
|
udelay(10);
|
2008-01-26 21:11:14 +08:00
|
|
|
smp_free_lowcore(cpu);
|
2008-12-25 20:39:50 +08:00
|
|
|
pr_info("Processor %d stopped\n", cpu);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2007-04-27 22:02:00 +08:00
|
|
|
void cpu_die(void)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
idle_task_exit();
|
2010-02-27 05:37:35 +08:00
|
|
|
while (sigp(smp_processor_id(), sigp_stop) == sigp_busy)
|
2009-10-29 22:04:13 +08:00
|
|
|
cpu_relax();
|
2007-04-27 22:02:00 +08:00
|
|
|
for (;;);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2006-02-18 05:52:46 +08:00
|
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
void __init smp_prepare_cpus(unsigned int max_cpus)
|
|
|
|
{
|
2008-02-19 22:29:29 +08:00
|
|
|
#ifndef CONFIG_64BIT
|
|
|
|
unsigned long save_area = 0;
|
|
|
|
#endif
|
|
|
|
unsigned long async_stack, panic_stack;
|
|
|
|
struct _lowcore *lowcore;
|
2005-04-17 06:20:36 +08:00
|
|
|
unsigned int cpu;
|
2007-04-27 22:02:00 +08:00
|
|
|
|
2008-01-26 21:11:05 +08:00
|
|
|
smp_detect_cpus();
|
|
|
|
|
2007-04-27 22:02:00 +08:00
|
|
|
/* request the 0x1201 emergency signal external interrupt */
|
|
|
|
if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0)
|
|
|
|
panic("Couldn't request external interrupt 0x1201");
|
2009-03-26 22:24:42 +08:00
|
|
|
print_cpu_info();
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-02-19 22:29:29 +08:00
|
|
|
/* Reallocate current lowcore, but keep its contents. */
|
2009-09-23 04:58:49 +08:00
|
|
|
lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
|
2008-02-19 22:29:29 +08:00
|
|
|
panic_stack = __get_free_page(GFP_KERNEL);
|
|
|
|
async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
|
2008-12-31 22:11:42 +08:00
|
|
|
BUG_ON(!lowcore || !panic_stack || !async_stack);
|
2006-01-06 16:19:28 +08:00
|
|
|
#ifndef CONFIG_64BIT
|
2005-06-26 05:55:30 +08:00
|
|
|
if (MACHINE_HAS_IEEE)
|
2008-02-19 22:29:29 +08:00
|
|
|
save_area = get_zeroed_page(GFP_KERNEL);
|
2005-06-26 05:55:30 +08:00
|
|
|
#endif
|
2008-02-19 22:29:29 +08:00
|
|
|
local_irq_disable();
|
|
|
|
local_mcck_disable();
|
|
|
|
lowcore_ptr[smp_processor_id()] = lowcore;
|
|
|
|
*lowcore = S390_lowcore;
|
|
|
|
lowcore->panic_stack = panic_stack + PAGE_SIZE;
|
|
|
|
lowcore->async_stack = async_stack + ASYNC_SIZE;
|
|
|
|
#ifndef CONFIG_64BIT
|
|
|
|
if (MACHINE_HAS_IEEE)
|
|
|
|
lowcore->extended_save_area_addr = (u32) save_area;
|
|
|
|
#endif
|
|
|
|
set_prefix((u32)(unsigned long) lowcore);
|
|
|
|
local_mcck_enable();
|
|
|
|
local_irq_enable();
|
2009-07-24 18:39:51 +08:00
|
|
|
#ifdef CONFIG_64BIT
|
|
|
|
if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore))
|
|
|
|
BUG();
|
|
|
|
#endif
|
2006-03-31 18:30:26 +08:00
|
|
|
for_each_possible_cpu(cpu)
|
2005-04-17 06:20:36 +08:00
|
|
|
if (cpu != smp_processor_id())
|
|
|
|
smp_create_idle(cpu);
|
|
|
|
}
|
|
|
|
|
2007-05-31 23:38:05 +08:00
|
|
|
void __init smp_prepare_boot_cpu(void)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
BUG_ON(smp_processor_id() != 0);
|
|
|
|
|
2008-01-26 21:11:05 +08:00
|
|
|
current_thread_info()->cpu = 0;
|
|
|
|
cpu_set(0, cpu_present_map);
|
2005-04-17 06:20:36 +08:00
|
|
|
cpu_set(0, cpu_online_map);
|
|
|
|
S390_lowcore.percpu_offset = __per_cpu_offset[0];
|
|
|
|
current_set[0] = current;
|
2008-01-26 21:10:56 +08:00
|
|
|
smp_cpu_state[0] = CPU_STATE_CONFIGURED;
|
2008-04-17 13:46:13 +08:00
|
|
|
smp_cpu_polarization[0] = POLARIZATION_UNKNWN;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2007-05-31 23:38:05 +08:00
|
|
|
void __init smp_cpus_done(unsigned int max_cpus)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
}
|
|
|
|
|
2010-01-14 03:44:34 +08:00
|
|
|
void __init smp_setup_processor_id(void)
|
|
|
|
{
|
|
|
|
S390_lowcore.cpu_nr = 0;
|
|
|
|
__cpu_logical_map[0] = stap();
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* the frequency of the profiling timer can be changed
|
|
|
|
* by writing a multiplier value into /proc/profile.
|
|
|
|
*
|
|
|
|
* usually you want to run this on all CPUs ;)
|
|
|
|
*/
|
|
|
|
int setup_profiling_timer(unsigned int multiplier)
|
|
|
|
{
|
2007-04-27 22:02:00 +08:00
|
|
|
return 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-01-26 21:10:56 +08:00
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
2008-07-02 00:48:41 +08:00
|
|
|
static ssize_t cpu_configure_show(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2008-01-26 21:10:56 +08:00
|
|
|
{
|
|
|
|
ssize_t count;
|
|
|
|
|
|
|
|
mutex_lock(&smp_cpu_state_mutex);
|
|
|
|
count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]);
|
|
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2008-07-02 00:48:41 +08:00
|
|
|
static ssize_t cpu_configure_store(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr,
|
|
|
|
const char *buf, size_t count)
|
2008-01-26 21:10:56 +08:00
|
|
|
{
|
|
|
|
int cpu = dev->id;
|
|
|
|
int val, rc;
|
|
|
|
char delim;
|
|
|
|
|
|
|
|
if (sscanf(buf, "%d %c", &val, &delim) != 1)
|
|
|
|
return -EINVAL;
|
|
|
|
if (val != 0 && val != 1)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2008-01-26 21:11:31 +08:00
|
|
|
get_online_cpus();
|
2008-04-30 19:38:36 +08:00
|
|
|
mutex_lock(&smp_cpu_state_mutex);
|
2008-01-26 21:10:56 +08:00
|
|
|
rc = -EBUSY;
|
2010-02-27 05:37:34 +08:00
|
|
|
/* disallow configuration changes of online cpus and cpu 0 */
|
|
|
|
if (cpu_online(cpu) || cpu == 0)
|
2008-01-26 21:10:56 +08:00
|
|
|
goto out;
|
|
|
|
rc = 0;
|
|
|
|
switch (val) {
|
|
|
|
case 0:
|
|
|
|
if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) {
|
|
|
|
rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]);
|
2008-04-17 13:46:13 +08:00
|
|
|
if (!rc) {
|
2008-01-26 21:10:56 +08:00
|
|
|
smp_cpu_state[cpu] = CPU_STATE_STANDBY;
|
2008-04-17 13:46:13 +08:00
|
|
|
smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
|
|
|
|
}
|
2008-01-26 21:10:56 +08:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) {
|
|
|
|
rc = sclp_cpu_configure(__cpu_logical_map[cpu]);
|
2008-04-17 13:46:13 +08:00
|
|
|
if (!rc) {
|
2008-01-26 21:10:56 +08:00
|
|
|
smp_cpu_state[cpu] = CPU_STATE_CONFIGURED;
|
2008-04-17 13:46:13 +08:00
|
|
|
smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
|
|
|
|
}
|
2008-01-26 21:10:56 +08:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
2008-04-30 19:38:36 +08:00
|
|
|
put_online_cpus();
|
2008-01-26 21:10:56 +08:00
|
|
|
return rc ? rc : count;
|
|
|
|
}
|
|
|
|
static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
|
|
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
|
2008-07-02 00:48:41 +08:00
|
|
|
static ssize_t cpu_polarization_show(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2008-04-17 13:46:13 +08:00
|
|
|
{
|
|
|
|
int cpu = dev->id;
|
|
|
|
ssize_t count;
|
|
|
|
|
|
|
|
mutex_lock(&smp_cpu_state_mutex);
|
|
|
|
switch (smp_cpu_polarization[cpu]) {
|
|
|
|
case POLARIZATION_HRZ:
|
|
|
|
count = sprintf(buf, "horizontal\n");
|
|
|
|
break;
|
|
|
|
case POLARIZATION_VL:
|
|
|
|
count = sprintf(buf, "vertical:low\n");
|
|
|
|
break;
|
|
|
|
case POLARIZATION_VM:
|
|
|
|
count = sprintf(buf, "vertical:medium\n");
|
|
|
|
break;
|
|
|
|
case POLARIZATION_VH:
|
|
|
|
count = sprintf(buf, "vertical:high\n");
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
count = sprintf(buf, "unknown\n");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
static SYSDEV_ATTR(polarization, 0444, cpu_polarization_show, NULL);
|
|
|
|
|
2008-07-02 00:48:41 +08:00
|
|
|
static ssize_t show_cpu_address(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2008-01-26 21:10:56 +08:00
|
|
|
{
|
|
|
|
return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]);
|
|
|
|
}
|
|
|
|
static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL);
|
|
|
|
|
|
|
|
|
|
|
|
static struct attribute *cpu_common_attrs[] = {
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
&attr_configure.attr,
|
|
|
|
#endif
|
|
|
|
&attr_address.attr,
|
2008-04-17 13:46:13 +08:00
|
|
|
&attr_polarization.attr,
|
2008-01-26 21:10:56 +08:00
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct attribute_group cpu_common_attr_group = {
|
|
|
|
.attrs = cpu_common_attrs,
|
|
|
|
};
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-07-02 00:48:41 +08:00
|
|
|
static ssize_t show_capability(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2007-04-27 22:01:56 +08:00
|
|
|
{
|
|
|
|
unsigned int capability;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rc = get_cpu_capability(&capability);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
return sprintf(buf, "%u\n", capability);
|
|
|
|
}
|
|
|
|
static SYSDEV_ATTR(capability, 0444, show_capability, NULL);
|
|
|
|
|
2008-07-02 00:48:41 +08:00
|
|
|
static ssize_t show_idle_count(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2007-10-22 18:52:39 +08:00
|
|
|
{
|
|
|
|
struct s390_idle_data *idle;
|
|
|
|
unsigned long long idle_count;
|
2009-06-22 18:08:20 +08:00
|
|
|
unsigned int sequence;
|
2007-10-22 18:52:39 +08:00
|
|
|
|
|
|
|
idle = &per_cpu(s390_idle, dev->id);
|
2009-06-22 18:08:20 +08:00
|
|
|
repeat:
|
|
|
|
sequence = idle->sequence;
|
|
|
|
smp_rmb();
|
|
|
|
if (sequence & 1)
|
|
|
|
goto repeat;
|
2007-10-22 18:52:39 +08:00
|
|
|
idle_count = idle->idle_count;
|
2008-12-31 22:11:40 +08:00
|
|
|
if (idle->idle_enter)
|
|
|
|
idle_count++;
|
2009-06-22 18:08:20 +08:00
|
|
|
smp_rmb();
|
|
|
|
if (idle->sequence != sequence)
|
|
|
|
goto repeat;
|
2007-10-22 18:52:39 +08:00
|
|
|
return sprintf(buf, "%llu\n", idle_count);
|
|
|
|
}
|
|
|
|
static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL);
|
|
|
|
|
2008-07-02 00:48:41 +08:00
|
|
|
static ssize_t show_idle_time(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2007-10-22 18:52:39 +08:00
|
|
|
{
|
|
|
|
struct s390_idle_data *idle;
|
2008-12-31 22:11:40 +08:00
|
|
|
unsigned long long now, idle_time, idle_enter;
|
2009-06-22 18:08:20 +08:00
|
|
|
unsigned int sequence;
|
2007-10-22 18:52:39 +08:00
|
|
|
|
|
|
|
idle = &per_cpu(s390_idle, dev->id);
|
2008-12-31 22:11:40 +08:00
|
|
|
now = get_clock();
|
2009-06-22 18:08:20 +08:00
|
|
|
repeat:
|
|
|
|
sequence = idle->sequence;
|
|
|
|
smp_rmb();
|
|
|
|
if (sequence & 1)
|
|
|
|
goto repeat;
|
2008-12-31 22:11:40 +08:00
|
|
|
idle_time = idle->idle_time;
|
|
|
|
idle_enter = idle->idle_enter;
|
|
|
|
if (idle_enter != 0ULL && idle_enter < now)
|
|
|
|
idle_time += now - idle_enter;
|
2009-06-22 18:08:20 +08:00
|
|
|
smp_rmb();
|
|
|
|
if (idle->sequence != sequence)
|
|
|
|
goto repeat;
|
2008-12-31 22:11:40 +08:00
|
|
|
return sprintf(buf, "%llu\n", idle_time >> 12);
|
2007-10-22 18:52:39 +08:00
|
|
|
}
|
2007-11-05 18:10:13 +08:00
|
|
|
static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL);
|
2007-10-22 18:52:39 +08:00
|
|
|
|
2008-01-26 21:10:56 +08:00
|
|
|
static struct attribute *cpu_online_attrs[] = {
|
2007-10-22 18:52:39 +08:00
|
|
|
&attr_capability.attr,
|
|
|
|
&attr_idle_count.attr,
|
2007-11-05 18:10:13 +08:00
|
|
|
&attr_idle_time_us.attr,
|
2007-10-22 18:52:39 +08:00
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
2008-01-26 21:10:56 +08:00
|
|
|
static struct attribute_group cpu_online_attr_group = {
|
|
|
|
.attrs = cpu_online_attrs,
|
2007-10-22 18:52:39 +08:00
|
|
|
};
|
|
|
|
|
2007-04-27 22:01:56 +08:00
|
|
|
static int __cpuinit smp_cpu_notify(struct notifier_block *self,
|
|
|
|
unsigned long action, void *hcpu)
|
|
|
|
{
|
|
|
|
unsigned int cpu = (unsigned int)(long)hcpu;
|
|
|
|
struct cpu *c = &per_cpu(cpu_devices, cpu);
|
|
|
|
struct sys_device *s = &c->sysdev;
|
2007-10-22 18:52:39 +08:00
|
|
|
struct s390_idle_data *idle;
|
2010-05-27 05:43:34 +08:00
|
|
|
int err = 0;
|
2007-04-27 22:01:56 +08:00
|
|
|
|
|
|
|
switch (action) {
|
|
|
|
case CPU_ONLINE:
|
2007-05-09 17:35:10 +08:00
|
|
|
case CPU_ONLINE_FROZEN:
|
2007-10-22 18:52:39 +08:00
|
|
|
idle = &per_cpu(s390_idle, cpu);
|
2009-06-22 18:08:20 +08:00
|
|
|
memset(idle, 0, sizeof(struct s390_idle_data));
|
2010-05-27 05:43:34 +08:00
|
|
|
err = sysfs_create_group(&s->kobj, &cpu_online_attr_group);
|
2007-04-27 22:01:56 +08:00
|
|
|
break;
|
|
|
|
case CPU_DEAD:
|
2007-05-09 17:35:10 +08:00
|
|
|
case CPU_DEAD_FROZEN:
|
2008-01-26 21:10:56 +08:00
|
|
|
sysfs_remove_group(&s->kobj, &cpu_online_attr_group);
|
2007-04-27 22:01:56 +08:00
|
|
|
break;
|
|
|
|
}
|
2010-05-27 05:43:34 +08:00
|
|
|
return notifier_from_errno(err);
|
2007-04-27 22:01:56 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block __cpuinitdata smp_cpu_nb = {
|
2007-04-27 22:02:00 +08:00
|
|
|
.notifier_call = smp_cpu_notify,
|
2007-04-27 22:01:56 +08:00
|
|
|
};
|
|
|
|
|
2008-02-05 23:50:40 +08:00
|
|
|
static int __devinit smp_add_present_cpu(int cpu)
|
2008-01-26 21:10:56 +08:00
|
|
|
{
|
|
|
|
struct cpu *c = &per_cpu(cpu_devices, cpu);
|
|
|
|
struct sys_device *s = &c->sysdev;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
c->hotpluggable = 1;
|
|
|
|
rc = register_cpu(c, cpu);
|
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group);
|
|
|
|
if (rc)
|
|
|
|
goto out_cpu;
|
|
|
|
if (!cpu_online(cpu))
|
|
|
|
goto out;
|
|
|
|
rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group);
|
|
|
|
if (!rc)
|
|
|
|
return 0;
|
|
|
|
sysfs_remove_group(&s->kobj, &cpu_common_attr_group);
|
|
|
|
out_cpu:
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
unregister_cpu(c);
|
|
|
|
#endif
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
2008-04-30 19:38:37 +08:00
|
|
|
|
2008-05-30 16:03:27 +08:00
|
|
|
int __ref smp_rescan_cpus(void)
|
2008-01-26 21:10:56 +08:00
|
|
|
{
|
|
|
|
cpumask_t newcpus;
|
|
|
|
int cpu;
|
|
|
|
int rc;
|
|
|
|
|
2008-01-26 21:11:31 +08:00
|
|
|
get_online_cpus();
|
2008-04-30 19:38:36 +08:00
|
|
|
mutex_lock(&smp_cpu_state_mutex);
|
2008-01-26 21:10:56 +08:00
|
|
|
newcpus = cpu_present_map;
|
2008-04-30 19:38:37 +08:00
|
|
|
rc = __smp_rescan_cpus();
|
2008-01-26 21:10:56 +08:00
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
cpus_andnot(newcpus, cpu_present_map, newcpus);
|
|
|
|
for_each_cpu_mask(cpu, newcpus) {
|
|
|
|
rc = smp_add_present_cpu(cpu);
|
|
|
|
if (rc)
|
|
|
|
cpu_clear(cpu, cpu_present_map);
|
|
|
|
}
|
|
|
|
rc = 0;
|
|
|
|
out:
|
|
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
2008-04-30 19:38:36 +08:00
|
|
|
put_online_cpus();
|
2008-04-17 13:46:13 +08:00
|
|
|
if (!cpus_empty(newcpus))
|
|
|
|
topology_schedule_update();
|
2008-04-30 19:38:37 +08:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2010-01-05 19:47:58 +08:00
|
|
|
static ssize_t __ref rescan_store(struct sysdev_class *class,
|
|
|
|
struct sysdev_class_attribute *attr,
|
|
|
|
const char *buf,
|
2008-04-30 19:38:37 +08:00
|
|
|
size_t count)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rc = smp_rescan_cpus();
|
2008-01-26 21:10:56 +08:00
|
|
|
return rc ? rc : count;
|
|
|
|
}
|
2008-10-28 18:10:16 +08:00
|
|
|
static SYSDEV_CLASS_ATTR(rescan, 0200, NULL, rescan_store);
|
2008-01-26 21:10:56 +08:00
|
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
|
2010-02-12 18:19:24 +08:00
|
|
|
static ssize_t dispatching_show(struct sysdev_class *class,
|
|
|
|
struct sysdev_class_attribute *attr,
|
|
|
|
char *buf)
|
2008-04-17 13:46:13 +08:00
|
|
|
{
|
|
|
|
ssize_t count;
|
|
|
|
|
|
|
|
mutex_lock(&smp_cpu_state_mutex);
|
|
|
|
count = sprintf(buf, "%d\n", cpu_management);
|
|
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2010-01-05 19:47:58 +08:00
|
|
|
static ssize_t dispatching_store(struct sysdev_class *dev,
|
|
|
|
struct sysdev_class_attribute *attr,
|
|
|
|
const char *buf,
|
2008-10-28 18:10:16 +08:00
|
|
|
size_t count)
|
2008-04-17 13:46:13 +08:00
|
|
|
{
|
|
|
|
int val, rc;
|
|
|
|
char delim;
|
|
|
|
|
|
|
|
if (sscanf(buf, "%d %c", &val, &delim) != 1)
|
|
|
|
return -EINVAL;
|
|
|
|
if (val != 0 && val != 1)
|
|
|
|
return -EINVAL;
|
|
|
|
rc = 0;
|
|
|
|
get_online_cpus();
|
2008-04-30 19:38:36 +08:00
|
|
|
mutex_lock(&smp_cpu_state_mutex);
|
2008-04-17 13:46:13 +08:00
|
|
|
if (cpu_management == val)
|
|
|
|
goto out;
|
|
|
|
rc = topology_set_cpu_management(val);
|
|
|
|
if (!rc)
|
|
|
|
cpu_management = val;
|
|
|
|
out:
|
|
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
2008-04-30 19:38:36 +08:00
|
|
|
put_online_cpus();
|
2008-04-17 13:46:13 +08:00
|
|
|
return rc ? rc : count;
|
|
|
|
}
|
2008-10-28 18:10:16 +08:00
|
|
|
static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show,
|
|
|
|
dispatching_store);
|
2008-04-17 13:46:13 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static int __init topology_init(void)
|
|
|
|
{
|
|
|
|
int cpu;
|
2007-10-22 18:52:39 +08:00
|
|
|
int rc;
|
2007-04-27 22:01:56 +08:00
|
|
|
|
|
|
|
register_cpu_notifier(&smp_cpu_nb);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-01-26 21:10:56 +08:00
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
2008-10-28 18:10:16 +08:00
|
|
|
rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_rescan);
|
2008-01-26 21:10:56 +08:00
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
#endif
|
2008-10-28 18:10:16 +08:00
|
|
|
rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_dispatching);
|
2008-04-17 13:46:13 +08:00
|
|
|
if (rc)
|
|
|
|
return rc;
|
2008-01-26 21:10:56 +08:00
|
|
|
for_each_present_cpu(cpu) {
|
|
|
|
rc = smp_add_present_cpu(cpu);
|
2007-10-22 18:52:39 +08:00
|
|
|
if (rc)
|
|
|
|
return rc;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
subsys_initcall(topology_init);
|