sparc64: Abstract away the %pcr values used to enable/disable NMI

We assumed PCR_PIC_PRIV can always be used to disable it, but that
won't be true for SPARC-T4.

This allows us also to get rid of some messy defines used in only
one location.

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

3 files changed, 26 insertions, 29 deletions

diff --git a/arch/sparc/include/asm/pcr.h b/arch/sparc/include/asm/pcr.h
index 4c71bec20659..9ebc7f3840d1 100644
--- a/arch/sparc/include/asm/pcr.h
+++ b/arch/sparc/include/asm/pcr.h
@@ -7,6 +7,8 @@ struct pcr_ops {
         u64 (*read_pic)(unsigned long);
         void (*write_pic)(unsigned long, u64);
         u64 (*nmi_picl_value)(unsigned int nmi_hz);
+        u64 pcr_nmi_enable;
+        u64 pcr_nmi_disable;
 };
 extern const struct pcr_ops *pcr_ops;
 
@@ -30,8 +32,6 @@ extern void schedule_deferred_pcr_work(void);
 #define PCR_N2_SL1_SHIFT        27
 #define PCR_N2_OV1              0x80000000
 
-extern u64 pcr_enable;
-
 extern int pcr_arch_init(void);
 
 #endif /* __PCR_H */
diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c
index 4c45158d4c88..6479256fd5a4 100644
--- a/arch/sparc/kernel/nmi.c
+++ b/arch/sparc/kernel/nmi.c
@@ -108,7 +108,7 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
                        pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP)
                 touched = 1;
         else
-                pcr_ops->write_pcr(0, PCR_PIC_PRIV);
+                pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_disable);
 
         sum = local_cpu_data().irq0_irqs;
         if (__get_cpu_var(nmi_touch)) {
@@ -126,7 +126,7 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
         }
         if (__get_cpu_var(wd_enabled)) {
                 pcr_ops->write_pic(0, pcr_ops->nmi_picl_value(nmi_hz));
-                pcr_ops->write_pcr(0, pcr_enable);
+                pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_enable);
         }
 
         restore_hardirq_stack(orig_sp);
@@ -165,7 +165,7 @@ static void report_broken_nmi(int cpu, int *prev_nmi_count)
 
 void stop_nmi_watchdog(void *unused)
 {
-        pcr_ops->write_pcr(0, PCR_PIC_PRIV);
+        pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_disable);
         __get_cpu_var(wd_enabled) = 0;
         atomic_dec(&nmi_active);
 }
@@ -222,10 +222,10 @@ void start_nmi_watchdog(void *unused)
         __get_cpu_var(wd_enabled) = 1;
         atomic_inc(&nmi_active);
 
-        pcr_ops->write_pcr(0, PCR_PIC_PRIV);
+        pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_disable);
         pcr_ops->write_pic(0, pcr_ops->nmi_picl_value(nmi_hz));
 
-        pcr_ops->write_pcr(0, pcr_enable);
+        pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_enable);
 }
 
 static void nmi_adjust_hz_one(void *unused)
@@ -233,10 +233,10 @@ static void nmi_adjust_hz_one(void *unused)
         if (!__get_cpu_var(wd_enabled))
                 return;
 
-        pcr_ops->write_pcr(0, PCR_PIC_PRIV);
+        pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_disable);
         pcr_ops->write_pic(0, pcr_ops->nmi_picl_value(nmi_hz));
 
-        pcr_ops->write_pcr(0, pcr_enable);
+        pcr_ops->write_pcr(0, pcr_ops->pcr_nmi_enable);
 }
 
 void nmi_adjust_hz(unsigned int new_hz)
diff --git a/arch/sparc/kernel/pcr.c b/arch/sparc/kernel/pcr.c
index 494af3227f3b..e408fc5d0c18 100644
--- a/arch/sparc/kernel/pcr.c
+++ b/arch/sparc/kernel/pcr.c
@@ -20,14 +20,6 @@
  * perf_event support layer.
  */
 
-#define PCR_SUN4U_ENABLE        (PCR_PIC_PRIV | PCR_STRACE | PCR_UTRACE)
-#define PCR_N2_ENABLE           (PCR_PIC_PRIV | PCR_STRACE | PCR_UTRACE | \
-                                 PCR_N2_TOE_OV1 | \
-                                 (2 << PCR_N2_SL1_SHIFT) | \
-                                 (0xff << PCR_N2_MASK1_SHIFT))
-
-u64 pcr_enable;
-
 /* Performance counter interrupts run unmasked at PIL level 15.
  * Therefore we can't do things like wakeups and other work
  * that expects IRQ disabling to be adhered to in locking etc.
@@ -105,11 +97,13 @@ static u64 direct_picl_value(unsigned int nmi_hz)
 }
 
 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,
+        .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,
+        .pcr_nmi_enable         = (PCR_PIC_PRIV | PCR_STRACE | PCR_UTRACE),
+        .pcr_nmi_disable        = PCR_PIC_PRIV,
 };
 
 static void n2_pcr_write(unsigned long reg_num, u64 val)
@@ -133,11 +127,16 @@ static u64 n2_picl_value(unsigned int nmi_hz)
 }
 
 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,
+        .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,
+        .pcr_nmi_enable         = (PCR_PIC_PRIV | PCR_STRACE | PCR_UTRACE |
+                                   PCR_N2_TOE_OV1 |
+                                   (2 << PCR_N2_SL1_SHIFT) |
+                                   (0xff << PCR_N2_MASK1_SHIFT)),
+        .pcr_nmi_disable        = PCR_PIC_PRIV,
 };
 
 static unsigned long perf_hsvc_group;
@@ -194,13 +193,11 @@ int __init pcr_arch_init(void)
         switch (tlb_type) {
         case hypervisor:
                 pcr_ops = &n2_pcr_ops;
-                pcr_enable = PCR_N2_ENABLE;
                 break;
 
         case cheetah:
         case cheetah_plus:
                 pcr_ops = &direct_pcr_ops;
-                pcr_enable = PCR_SUN4U_ENABLE;
                 break;
 
         case spitfire: