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x86, lib: Add wbinvd smp helpers

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commit a7b480e7f3 upstream.

Add wbinvd_on_cpu and wbinvd_on_all_cpus stubs for executing wbinvd on a
particular CPU.

[ hpa: renamed lib/smp.c to lib/cache-smp.c ]
[ hpa: wbinvd_on_all_cpus() returns int, but wbinvd() returns
  void.  Thus, the former cannot be a macro for the latter,
  replace with an inline function. ]

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
LKML-Reference: <1264172467-25155-2-git-send-email-bp@amd64.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Borislav Petkov
2010-01-22 16:01:03 +01:00
committed by Greg Kroah-Hartman
parent b98388e5a6
commit 2444b629ee
3 changed files with 29 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
arch/x86/include/asm/smp.h
View File

@@ -135,6 +135,8 @@ int native_cpu_disable(void);
void native_cpu_die(unsigned int cpu);
void native_play_dead(void);
void play_dead_common(void);
void wbinvd_on_cpu(int cpu);
int wbinvd_on_all_cpus(void);
void native_send_call_func_ipi(const struct cpumask *mask);
void native_send_call_func_single_ipi(int cpu);
@@ -147,6 +149,13 @@ static inline int num_booting_cpus(void)
{
return cpumask_weight(cpu_callout_mask);
}
#else /* !CONFIG_SMP */
#define wbinvd_on_cpu(cpu) wbinvd()
static inline int wbinvd_on_all_cpus(void)
{
wbinvd();
return 0;
}
#endif /* CONFIG_SMP */
extern unsigned disabled_cpus __cpuinitdata;

2
arch/x86/lib/Makefile
View File

@@ -2,7 +2,7 @@
# Makefile for x86 specific library files.
#
obj-$(CONFIG_SMP) += msr-smp.o
obj-$(CONFIG_SMP) += msr-smp.o cache-smp.o
lib-y := delay.o
lib-y += thunk_$(BITS).o

19
arch/x86/lib/cache-smp.c Normal file
View File

@@ -0,0 +1,19 @@
#include <linux/smp.h>
#include <linux/module.h>
static void __wbinvd(void *dummy)
{
wbinvd();
}
void wbinvd_on_cpu(int cpu)
{
smp_call_function_single(cpu, __wbinvd, NULL, 1);
}
EXPORT_SYMBOL(wbinvd_on_cpu);
int wbinvd_on_all_cpus(void)
{
return on_each_cpu(__wbinvd, NULL, 1);
}
EXPORT_SYMBOL(wbinvd_on_all_cpus);