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[POWERPC] Add DSCR SPR to sysfs

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POWER6 adds a new SPR, the data stream control register (DSCR). It can
be used to adjust how agressive the prefetch mechanisms are.

Its possible we may want to context switch this, but for now just export
it to userspace via sysfs so we can adjust it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Blanchard
2006-12-08 17:46:58 +11:00
committed by Paul Mackerras
parent 396a1a5832
commit 4c198557c6
3 changed files with 13 additions and 2 deletions
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8
arch/powerpc/kernel/sysfs.c
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@@ -181,6 +181,7 @@ SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
SYSFS_PMCSETUP(purr, SPRN_PURR);
SYSFS_PMCSETUP(dscr, SPRN_DSCR);
static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
@@ -194,6 +195,7 @@ static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr);
static void register_cpu_online(unsigned int cpu)
{
@@ -231,6 +233,9 @@ static void register_cpu_online(unsigned int cpu)
if (cpu_has_feature(CPU_FTR_PURR))
sysdev_create_file(s, &attr_purr);
if (cpu_has_feature(CPU_FTR_DSCR))
sysdev_create_file(s, &attr_dscr);
}
#ifdef CONFIG_HOTPLUG_CPU
@@ -272,6 +277,9 @@ static void unregister_cpu_online(unsigned int cpu)
if (cpu_has_feature(CPU_FTR_PURR))
sysdev_remove_file(s, &attr_purr);
if (cpu_has_feature(CPU_FTR_DSCR))
sysdev_remove_file(s, &attr_dscr);
}
#endif /* CONFIG_HOTPLUG_CPU */