sparc64: Abstract away the NMI PIC counter computation.

Signed-off-by: David S. Miller <davem@davemloft.net>

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);

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);
 }

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: