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sparc64: Abstract away the NMI PIC counter computation.

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-08-16 23:26:01 -07:00
parent 09d053c797
commit 73a6b0538c
3 changed files with 20 additions and 19 deletions
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15
arch/sparc/include/asm/pcr.h
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@ -6,6 +6,7 @@ struct pcr_ops {
void (*write_pcr)(unsigned long, u64); void (*write_pcr)(unsigned long, u64);
u64 (*read_pic)(unsigned long); u64 (*read_pic)(unsigned long);
void (*write_pic)(unsigned long, u64); void (*write_pic)(unsigned long, u64);
u64 (*nmi_picl_value)(unsigned int nmi_hz);
}; };
extern const struct pcr_ops *pcr_ops; 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_SL1_SHIFT 27
#define PCR_N2_OV1 0x80000000 #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 u64 pcr_enable;
extern int pcr_arch_init(void); extern int pcr_arch_init(void);

6
arch/sparc/kernel/nmi.c
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@ -125,7 +125,7 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
__this_cpu_write(alert_counter, 0); __this_cpu_write(alert_counter, 0);
} }
if (__get_cpu_var(wd_enabled)) { 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); pcr_ops->write_pcr(0, pcr_enable);
} }
@ -223,7 +223,7 @@ void start_nmi_watchdog(void *unused)
atomic_inc(&nmi_active); atomic_inc(&nmi_active);
pcr_ops->write_pcr(0, PCR_PIC_PRIV); 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); pcr_ops->write_pcr(0, pcr_enable);
} }
@ -234,7 +234,7 @@ static void nmi_adjust_hz_one(void *unused)
return; return;
pcr_ops->write_pcr(0, PCR_PIC_PRIV); 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); pcr_ops->write_pcr(0, pcr_enable);
} }

18
arch/sparc/kernel/pcr.c
View File

@ -27,7 +27,6 @@
(0xff << PCR_N2_MASK1_SHIFT)) (0xff << PCR_N2_MASK1_SHIFT))
u64 pcr_enable; u64 pcr_enable;
unsigned int picl_shift;
/* Performance counter interrupts run unmasked at PIL level 15. /* Performance counter interrupts run unmasked at PIL level 15.
* Therefore we can't do things like wakeups and other work * 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)); "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 = { static const struct pcr_ops direct_pcr_ops = {
.read_pcr = direct_pcr_read, .read_pcr = direct_pcr_read,
.write_pcr = direct_pcr_write, .write_pcr = direct_pcr_write,
.read_pic = direct_pic_read, .read_pic = direct_pic_read,
.write_pic = direct_pic_write, .write_pic = direct_pic_write,
.nmi_picl_value = direct_picl_value,
}; };
static void n2_pcr_write(unsigned long reg_num, u64 val) 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); 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 = { static const struct pcr_ops n2_pcr_ops = {
.read_pcr = direct_pcr_read, .read_pcr = direct_pcr_read,
.write_pcr = n2_pcr_write, .write_pcr = n2_pcr_write,
.read_pic = direct_pic_read, .read_pic = direct_pic_read,
.write_pic = direct_pic_write, .write_pic = direct_pic_write,
.nmi_picl_value = n2_picl_value,
}; };
static unsigned long perf_hsvc_group; static unsigned long perf_hsvc_group;
@ -180,7 +195,6 @@ int __init pcr_arch_init(void)
case hypervisor: case hypervisor:
pcr_ops = &n2_pcr_ops; pcr_ops = &n2_pcr_ops;
pcr_enable = PCR_N2_ENABLE; pcr_enable = PCR_N2_ENABLE;
picl_shift = 2;
break; break;
case cheetah: case cheetah: