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sparc64: Abstract away PIC register accesses.

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And, like for the PCR, allow indexing of different PIC register
numbers.

This also removes all of the non-__KERNEL__ bits from asm/perfctr.h,
nothing kernel side should include it any more.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-08-16 23:19:32 -07:00
parent 0bab20ba4c
commit 09d053c797
5 changed files with 61 additions and 64 deletions
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6
arch/sparc/include/asm/pcr.h
View File

@ -2,8 +2,10 @@
#define __PCR_H
struct pcr_ops {
u64 (*read)(unsigned long);
void (*write)(unsigned long, u64);
u64 (*read_pcr)(unsigned long);
void (*write_pcr)(unsigned long, u64);
u64 (*read_pic)(unsigned long);
void (*write_pic)(unsigned long, u64);
};
extern const struct pcr_ops *pcr_ops;

30
arch/sparc/include/asm/perfctr.h
View File

@ -54,11 +54,6 @@ enum perfctr_opcode {
PERFCTR_GETPCR
};
/* I don't want the kernel's namespace to be polluted with this
* stuff when this file is included. --DaveM
*/
#ifndef __KERNEL__
#define PRIV 0x00000001
#define SYS 0x00000002
#define USR 0x00000004
@ -168,29 +163,4 @@ struct vcounter_struct {
unsigned long long vcnt1;
};
#else /* !(__KERNEL__) */
#ifndef CONFIG_SPARC32
/* Performance counter register access. */
#define read_pcr(__p) __asm__ __volatile__("rd %%pcr, %0" : "=r" (__p))
#define write_pcr(__p) __asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (__p))
#define read_pic(__p) __asm__ __volatile__("rd %%pic, %0" : "=r" (__p))
/* Blackbird errata workaround. See commentary in
* arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt()
* for more information.
*/
#define write_pic(__p) \
__asm__ __volatile__("ba,pt %%xcc, 99f\n\t" \
" nop\n\t" \
".align 64\n" \
"99:wr %0, 0x0, %%pic\n\t" \
"rd %%pic, %%g0" : : "r" (__p))
#define reset_pic() write_pic(0)
#endif /* !CONFIG_SPARC32 */
#endif /* !(__KERNEL__) */
#endif /* !(PERF_COUNTER_API) */

21
arch/sparc/kernel/nmi.c
View File

@ -22,7 +22,6 @@
#include <asm/perf_event.h>
#include <asm/ptrace.h>
#include <asm/pcr.h>
#include <asm/perfctr.h>
#include "kstack.h"
@ -109,7 +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(0, PCR_PIC_PRIV);
pcr_ops->write_pcr(0, PCR_PIC_PRIV);
sum = local_cpu_data().irq0_irqs;
if (__get_cpu_var(nmi_touch)) {
@ -126,8 +125,8 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
__this_cpu_write(alert_counter, 0);
}
if (__get_cpu_var(wd_enabled)) {
write_pic(picl_value(nmi_hz));
pcr_ops->write(0, pcr_enable);
pcr_ops->write_pic(0, picl_value(nmi_hz));
pcr_ops->write_pcr(0, pcr_enable);
}
restore_hardirq_stack(orig_sp);
@ -166,7 +165,7 @@ static void report_broken_nmi(int cpu, int *prev_nmi_count)
void stop_nmi_watchdog(void *unused)
{
pcr_ops->write(0, PCR_PIC_PRIV);
pcr_ops->write_pcr(0, PCR_PIC_PRIV);
__get_cpu_var(wd_enabled) = 0;
atomic_dec(&nmi_active);
}
@ -223,10 +222,10 @@ void start_nmi_watchdog(void *unused)
__get_cpu_var(wd_enabled) = 1;
atomic_inc(&nmi_active);
pcr_ops->write(0, PCR_PIC_PRIV);
write_pic(picl_value(nmi_hz));
pcr_ops->write_pcr(0, PCR_PIC_PRIV);
pcr_ops->write_pic(0, picl_value(nmi_hz));
pcr_ops->write(0, pcr_enable);
pcr_ops->write_pcr(0, pcr_enable);
}
static void nmi_adjust_hz_one(void *unused)
@ -234,10 +233,10 @@ static void nmi_adjust_hz_one(void *unused)
if (!__get_cpu_var(wd_enabled))
return;
pcr_ops->write(0, PCR_PIC_PRIV);
write_pic(picl_value(nmi_hz));
pcr_ops->write_pcr(0, PCR_PIC_PRIV);
pcr_ops->write_pic(0, picl_value(nmi_hz));
pcr_ops->write(0, pcr_enable);
pcr_ops->write_pcr(0, pcr_enable);
}
void nmi_adjust_hz(unsigned int new_hz)

45
arch/sparc/kernel/pcr.c
View File

@ -14,7 +14,6 @@
#include <asm/pcr.h>
#include <asm/nmi.h>
#include <asm/spitfire.h>
#include <asm/perfctr.h>
/* This code is shared between various users of the performance
* counters. Users will be oprofile, pseudo-NMI watchdog, and the
@ -65,19 +64,45 @@ static u64 direct_pcr_read(unsigned long reg_num)
u64 val;
WARN_ON_ONCE(reg_num != 0);
read_pcr(val);
__asm__ __volatile__("rd %%pcr, %0" : "=r" (val));
return val;
}
static void direct_pcr_write(unsigned long reg_num, u64 val)
{
WARN_ON_ONCE(reg_num != 0);
write_pcr(val);
__asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (val));
}
static u64 direct_pic_read(unsigned long reg_num)
{
u64 val;
WARN_ON_ONCE(reg_num != 0);
__asm__ __volatile__("rd %%pic, %0" : "=r" (val));
return val;
}
static void direct_pic_write(unsigned long reg_num, u64 val)
{
WARN_ON_ONCE(reg_num != 0);
/* Blackbird errata workaround. See commentary in
* arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt()
* for more information.
*/
__asm__ __volatile__("ba,pt %%xcc, 99f\n\t"
" nop\n\t"
".align 64\n"
"99:wr %0, 0x0, %%pic\n\t"
"rd %%pic, %%g0" : : "r" (val));
}
static const struct pcr_ops direct_pcr_ops = {
.read = direct_pcr_read,
.write = direct_pcr_write,
.read_pcr = direct_pcr_read,
.write_pcr = direct_pcr_write,
.read_pic = direct_pic_read,
.write_pic = direct_pic_write,
};
static void n2_pcr_write(unsigned long reg_num, u64 val)
@ -88,14 +113,16 @@ static void n2_pcr_write(unsigned long reg_num, u64 val)
if (val & PCR_N2_HTRACE) {
ret = sun4v_niagara2_setperf(HV_N2_PERF_SPARC_CTL, val);
if (ret != HV_EOK)
write_pcr(val);
direct_pcr_write(reg_num, val);
} else
write_pcr(val);
direct_pcr_write(reg_num, val);
}
static const struct pcr_ops n2_pcr_ops = {
.read = direct_pcr_read,
.write = n2_pcr_write,
.read_pcr = direct_pcr_read,
.write_pcr = n2_pcr_write,
.read_pic = direct_pic_read,
.write_pic = direct_pic_write,
};
static unsigned long perf_hsvc_group;

23
arch/sparc/kernel/perf_event.c
View File

@ -25,7 +25,6 @@
#include <linux/atomic.h>
#include <asm/nmi.h>
#include <asm/pcr.h>
#include <asm/perfctr.h>
#include <asm/cacheflush.h>
#include "kernel.h"
@ -564,7 +563,7 @@ static inline void sparc_pmu_enable_event(struct cpu_hw_events *cpuc, struct hw_
val |= hwc->config;
cpuc->pcr = val;
pcr_ops->write(0, cpuc->pcr);
pcr_ops->write_pcr(0, cpuc->pcr);
}
static inline void sparc_pmu_disable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx)
@ -578,14 +577,14 @@ static inline void sparc_pmu_disable_event(struct cpu_hw_events *cpuc, struct hw
val |= nop;
cpuc->pcr = val;
pcr_ops->write(0, cpuc->pcr);
pcr_ops->write_pcr(0, cpuc->pcr);
}
static u32 read_pmc(int idx)
{
u64 val;
read_pic(val);
val = pcr_ops->read_pic(0);
if (idx == PIC_UPPER_INDEX)
val >>= 32;
@ -603,10 +602,10 @@ static void write_pmc(int idx, u64 val)
mask = ((u64) 0xffffffff) << shift;
val <<= shift;
read_pic(pic);
pic = pcr_ops->read_pic(0);
pic &= ~mask;
pic |= val;
write_pic(pic);
pcr_ops->write_pic(0, pic);
}
static u64 sparc_perf_event_update(struct perf_event *event,
@ -736,7 +735,7 @@ static void sparc_pmu_enable(struct pmu *pmu)
cpuc->pcr = pcr | cpuc->event[0]->hw.config_base;
}
pcr_ops->write(0, cpuc->pcr);
pcr_ops->write_pcr(0, cpuc->pcr);
}
static void sparc_pmu_disable(struct pmu *pmu)
@ -755,7 +754,7 @@ static void sparc_pmu_disable(struct pmu *pmu)
sparc_pmu->hv_bit | sparc_pmu->irq_bit);
cpuc->pcr = val;
pcr_ops->write(0, cpuc->pcr);
pcr_ops->write_pcr(0, cpuc->pcr);
}
static int active_event_index(struct cpu_hw_events *cpuc,
@ -856,7 +855,7 @@ static void perf_stop_nmi_watchdog(void *unused)
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
stop_nmi_watchdog(NULL);
cpuc->pcr = pcr_ops->read(0);
cpuc->pcr = pcr_ops->read_pcr(0);
}
void perf_event_grab_pmc(void)
@ -1264,8 +1263,8 @@ void perf_event_print_debug(void)
cpu = smp_processor_id();
pcr = pcr_ops->read(0);
read_pic(pic);
pcr = pcr_ops->read_pcr(0);
pic = pcr_ops->read_pic(0);
pr_info("\n");
pr_info("CPU#%d: PCR[%016llx] PIC[%016llx]\n",
@ -1306,7 +1305,7 @@ static int __kprobes perf_event_nmi_handler(struct notifier_block *self,
* overflow so we don't lose any events.
*/
if (sparc_pmu->irq_bit)
pcr_ops->write(0, cpuc->pcr);
pcr_ops->write_pcr(0, cpuc->pcr);
for (i = 0; i < cpuc->n_events; i++) {
struct perf_event *event = cpuc->event[i];