From 73a6b0538c131d489fe7a2581deddb72faca496b Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 16 Aug 2012 23:26:01 -0700 Subject: sparc64: Abstract away the NMI PIC counter computation. Signed-off-by: David S. Miller --- arch/sparc/include/asm/pcr.h | 15 +-------------- arch/sparc/kernel/nmi.c | 6 +++--- arch/sparc/kernel/pcr.c | 18 ++++++++++++++++-- 3 files changed, 20 insertions(+), 19 deletions(-) diff --git a/arch/sparc/include/asm/pcr.h b/arch/sparc/include/asm/pcr.h index d53abf75198..4c71bec2065 100644 --- a/arch/sparc/include/asm/pcr.h +++ b/arch/sparc/include/asm/pcr.h @@ -6,6 +6,7 @@ struct pcr_ops { void (*write_pcr)(unsigned long, u64); u64 (*read_pic)(unsigned long); void (*write_pic)(unsigned long, u64); + u64 (*nmi_picl_value)(unsigned int nmi_hz); }; extern const struct pcr_ops *pcr_ops; @@ -29,20 +30,6 @@ extern void schedule_deferred_pcr_work(void); #define PCR_N2_SL1_SHIFT 27 #define PCR_N2_OV1 0x80000000 -extern unsigned int picl_shift; - -/* In order to commonize as much of the implementation as - * possible, we use PICH as our counter. Mostly this is - * to accommodate Niagara-1 which can only count insn cycles - * in PICH. - */ -static inline u64 picl_value(unsigned int nmi_hz) -{ - u32 delta = local_cpu_data().clock_tick / (nmi_hz << picl_shift); - - return ((u64)((0 - delta) & 0xffffffff)) << 32; -} - extern u64 pcr_enable; extern int pcr_arch_init(void); diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c index ef22b9bacf1..4c45158d4c8 100644 --- a/arch/sparc/kernel/nmi.c +++ b/arch/sparc/kernel/nmi.c @@ -125,7 +125,7 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs) __this_cpu_write(alert_counter, 0); } if (__get_cpu_var(wd_enabled)) { - pcr_ops->write_pic(0, picl_value(nmi_hz)); + pcr_ops->write_pic(0, pcr_ops->nmi_picl_value(nmi_hz)); pcr_ops->write_pcr(0, pcr_enable); } @@ -223,7 +223,7 @@ void start_nmi_watchdog(void *unused) atomic_inc(&nmi_active); pcr_ops->write_pcr(0, PCR_PIC_PRIV); - pcr_ops->write_pic(0, picl_value(nmi_hz)); + pcr_ops->write_pic(0, pcr_ops->nmi_picl_value(nmi_hz)); pcr_ops->write_pcr(0, pcr_enable); } @@ -234,7 +234,7 @@ static void nmi_adjust_hz_one(void *unused) return; pcr_ops->write_pcr(0, PCR_PIC_PRIV); - pcr_ops->write_pic(0, picl_value(nmi_hz)); + pcr_ops->write_pic(0, pcr_ops->nmi_picl_value(nmi_hz)); pcr_ops->write_pcr(0, pcr_enable); } diff --git a/arch/sparc/kernel/pcr.c b/arch/sparc/kernel/pcr.c index e82ae89666f..494af3227f3 100644 --- a/arch/sparc/kernel/pcr.c +++ b/arch/sparc/kernel/pcr.c @@ -27,7 +27,6 @@ (0xff << PCR_N2_MASK1_SHIFT)) u64 pcr_enable; -unsigned int picl_shift; /* Performance counter interrupts run unmasked at PIL level 15. * Therefore we can't do things like wakeups and other work @@ -98,11 +97,19 @@ static void direct_pic_write(unsigned long reg_num, u64 val) "rd %%pic, %%g0" : : "r" (val)); } +static u64 direct_picl_value(unsigned int nmi_hz) +{ + u32 delta = local_cpu_data().clock_tick / nmi_hz; + + return ((u64)((0 - delta) & 0xffffffff)) << 32; +} + static const struct pcr_ops direct_pcr_ops = { .read_pcr = direct_pcr_read, .write_pcr = direct_pcr_write, .read_pic = direct_pic_read, .write_pic = direct_pic_write, + .nmi_picl_value = direct_picl_value, }; static void n2_pcr_write(unsigned long reg_num, u64 val) @@ -118,11 +125,19 @@ static void n2_pcr_write(unsigned long reg_num, u64 val) direct_pcr_write(reg_num, val); } +static u64 n2_picl_value(unsigned int nmi_hz) +{ + u32 delta = local_cpu_data().clock_tick / (nmi_hz << 2); + + return ((u64)((0 - delta) & 0xffffffff)) << 32; +} + static const struct pcr_ops n2_pcr_ops = { .read_pcr = direct_pcr_read, .write_pcr = n2_pcr_write, .read_pic = direct_pic_read, .write_pic = direct_pic_write, + .nmi_picl_value = n2_picl_value, }; static unsigned long perf_hsvc_group; @@ -180,7 +195,6 @@ int __init pcr_arch_init(void) case hypervisor: pcr_ops = &n2_pcr_ops; pcr_enable = PCR_N2_ENABLE; - picl_shift = 2; break; case cheetah: -- cgit v1.2.3-70-g09d2