From 4c198557c6b45956a6f54b958fb97a15b02a6a3b Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Fri, 8 Dec 2006 17:46:58 +1100 Subject: [POWERPC] Add DSCR SPR to sysfs 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 Signed-off-by: Paul Mackerras --- arch/powerpc/kernel/sysfs.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/powerpc/kernel') diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c index 63ed265b7f0..22daba56c86 100644 --- a/arch/powerpc/kernel/sysfs.c +++ b/arch/powerpc/kernel/sysfs.c @@ -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 */ -- cgit v1.2.3-70-g09d2