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[SPARC64]: Provide mmu statistics via sysfs.
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If the system supports hypervisor based statistics, allow them to
be fetched, enabled, and disabled via sysfs.

Enable and disable via the boolean:

/sys/devices/systems/cpu/cpuN/mmustat_enable

Statistic values are provided under:

/sys/devices/systems/cpu/cpuN/mmu_status/

Signed-off-by: David S. Miller <davem@davemloft.net>
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David Miller authored and David S. Miller committed Jun 5, 2007
1 parent 48b6735 commit d887ab3
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Showing 3 changed files with 227 additions and 15 deletions.
22 changes: 22 additions & 0 deletions arch/sparc64/kernel/entry.S
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2570,3 +2570,25 @@ sun4v_svc_clrstatus:
retl
nop
.size sun4v_svc_clrstatus, .-sun4v_svc_clrstatus

.globl sun4v_mmustat_conf
.type sun4v_mmustat_conf,#function
sun4v_mmustat_conf:
mov %o1, %o4
mov HV_FAST_MMUSTAT_CONF, %o5
ta HV_FAST_TRAP
stx %o1, [%o4]
retl
nop
.size sun4v_mmustat_conf, .-sun4v_mmustat_conf

.globl sun4v_mmustat_info
.type sun4v_mmustat_info,#function
sun4v_mmustat_info:
mov %o0, %o4
mov HV_FAST_MMUSTAT_INFO, %o5
ta HV_FAST_TRAP
stx %o1, [%o4]
retl
nop
.size sun4v_mmustat_info, .-sun4v_mmustat_info
215 changes: 200 additions & 15 deletions arch/sparc64/kernel/sysfs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -8,32 +8,198 @@
#include <linux/percpu.h>
#include <linux/init.h>

static DEFINE_PER_CPU(struct cpu, cpu_devices);
#include <asm/hypervisor.h>
#include <asm/spitfire.h>

static DEFINE_PER_CPU(struct hv_mmu_statistics, mmu_stats) __attribute__((aligned(64)));

#define SHOW_ULONG_NAME(NAME, MEMBER) \
#define SHOW_MMUSTAT_ULONG(NAME) \
static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
{ \
struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
cpuinfo_sparc *c = &cpu_data(cpu->sysdev.id); \
struct hv_mmu_statistics *p = &per_cpu(mmu_stats, dev->id); \
return sprintf(buf, "%lu\n", p->NAME); \
} \
static SYSDEV_ATTR(NAME, 0444, show_##NAME, NULL)

SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_8k_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_8k_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_64k_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_64k_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_4mb_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_4mb_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_256mb_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_256mb_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_8k_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_8k_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_64k_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_64k_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_4mb_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_4mb_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_256mb_tte);
SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_256mb_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_8k_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_8k_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_64k_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_64k_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_4mb_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_4mb_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_256mb_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_256mb_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_8k_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_8k_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_64k_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_64k_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_4mb_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_4mb_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_256mb_tte);
SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_256mb_tte);

static struct attribute *mmu_stat_attrs[] = {
&attr_immu_tsb_hits_ctx0_8k_tte.attr,
&attr_immu_tsb_ticks_ctx0_8k_tte.attr,
&attr_immu_tsb_hits_ctx0_64k_tte.attr,
&attr_immu_tsb_ticks_ctx0_64k_tte.attr,
&attr_immu_tsb_hits_ctx0_4mb_tte.attr,
&attr_immu_tsb_ticks_ctx0_4mb_tte.attr,
&attr_immu_tsb_hits_ctx0_256mb_tte.attr,
&attr_immu_tsb_ticks_ctx0_256mb_tte.attr,
&attr_immu_tsb_hits_ctxnon0_8k_tte.attr,
&attr_immu_tsb_ticks_ctxnon0_8k_tte.attr,
&attr_immu_tsb_hits_ctxnon0_64k_tte.attr,
&attr_immu_tsb_ticks_ctxnon0_64k_tte.attr,
&attr_immu_tsb_hits_ctxnon0_4mb_tte.attr,
&attr_immu_tsb_ticks_ctxnon0_4mb_tte.attr,
&attr_immu_tsb_hits_ctxnon0_256mb_tte.attr,
&attr_immu_tsb_ticks_ctxnon0_256mb_tte.attr,
&attr_dmmu_tsb_hits_ctx0_8k_tte.attr,
&attr_dmmu_tsb_ticks_ctx0_8k_tte.attr,
&attr_dmmu_tsb_hits_ctx0_64k_tte.attr,
&attr_dmmu_tsb_ticks_ctx0_64k_tte.attr,
&attr_dmmu_tsb_hits_ctx0_4mb_tte.attr,
&attr_dmmu_tsb_ticks_ctx0_4mb_tte.attr,
&attr_dmmu_tsb_hits_ctx0_256mb_tte.attr,
&attr_dmmu_tsb_ticks_ctx0_256mb_tte.attr,
&attr_dmmu_tsb_hits_ctxnon0_8k_tte.attr,
&attr_dmmu_tsb_ticks_ctxnon0_8k_tte.attr,
&attr_dmmu_tsb_hits_ctxnon0_64k_tte.attr,
&attr_dmmu_tsb_ticks_ctxnon0_64k_tte.attr,
&attr_dmmu_tsb_hits_ctxnon0_4mb_tte.attr,
&attr_dmmu_tsb_ticks_ctxnon0_4mb_tte.attr,
&attr_dmmu_tsb_hits_ctxnon0_256mb_tte.attr,
&attr_dmmu_tsb_ticks_ctxnon0_256mb_tte.attr,
NULL,
};

static struct attribute_group mmu_stat_group = {
.attrs = mmu_stat_attrs,
.name = "mmu_stats",
};

/* XXX convert to rusty's on_one_cpu */
static unsigned long run_on_cpu(unsigned long cpu,
unsigned long (*func)(unsigned long),
unsigned long arg)
{
cpumask_t old_affinity = current->cpus_allowed;
unsigned long ret;

/* should return -EINVAL to userspace */
if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
return 0;

ret = func(arg);

set_cpus_allowed(current, old_affinity);

return ret;
}

static unsigned long read_mmustat_enable(unsigned long junk)
{
unsigned long ra = 0;

sun4v_mmustat_info(&ra);

return ra != 0;
}

static unsigned long write_mmustat_enable(unsigned long val)
{
unsigned long ra, orig_ra;

if (val)
ra = __pa(&per_cpu(mmu_stats, smp_processor_id()));
else
ra = 0UL;

return sun4v_mmustat_conf(ra, &orig_ra);
}

static ssize_t show_mmustat_enable(struct sys_device *s, char *buf)
{
unsigned long val = run_on_cpu(s->id, read_mmustat_enable, 0);
return sprintf(buf, "%lx\n", val);
}

static ssize_t store_mmustat_enable(struct sys_device *s, const char *buf, size_t count)
{
unsigned long val, err;
int ret = sscanf(buf, "%ld", &val);

if (ret != 1)
return -EINVAL;

err = run_on_cpu(s->id, write_mmustat_enable, val);
if (err)
return -EIO;

return count;
}

static SYSDEV_ATTR(mmustat_enable, 0644, show_mmustat_enable, store_mmustat_enable);

static int mmu_stats_supported;

static int register_mmu_stats(struct sys_device *s)
{
if (!mmu_stats_supported)
return 0;
sysdev_create_file(s, &attr_mmustat_enable);
return sysfs_create_group(&s->kobj, &mmu_stat_group);
}

#ifdef CONFIG_HOTPLUG_CPU
static void unregister_mmu_stats(struct sys_device *s)
{
if (!mmu_stats_supported)
return;
sysfs_remove_group(&s->kobj, &mmu_stat_group);
sysdev_remove_file(s, &attr_mmustat_enable);
}
#endif

#define SHOW_CPUDATA_ULONG_NAME(NAME, MEMBER) \
static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
{ \
cpuinfo_sparc *c = &cpu_data(dev->id); \
return sprintf(buf, "%lu\n", c->MEMBER); \
}

#define SHOW_UINT_NAME(NAME, MEMBER) \
#define SHOW_CPUDATA_UINT_NAME(NAME, MEMBER) \
static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
{ \
struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
cpuinfo_sparc *c = &cpu_data(cpu->sysdev.id); \
cpuinfo_sparc *c = &cpu_data(dev->id); \
return sprintf(buf, "%u\n", c->MEMBER); \
}

SHOW_ULONG_NAME(clock_tick, clock_tick);
SHOW_ULONG_NAME(udelay_val, udelay_val);
SHOW_UINT_NAME(l1_dcache_size, dcache_size);
SHOW_UINT_NAME(l1_dcache_line_size, dcache_line_size);
SHOW_UINT_NAME(l1_icache_size, icache_size);
SHOW_UINT_NAME(l1_icache_line_size, icache_line_size);
SHOW_UINT_NAME(l2_cache_size, ecache_size);
SHOW_UINT_NAME(l2_cache_line_size, ecache_line_size);
SHOW_CPUDATA_ULONG_NAME(clock_tick, clock_tick);
SHOW_CPUDATA_ULONG_NAME(udelay_val, udelay_val);
SHOW_CPUDATA_UINT_NAME(l1_dcache_size, dcache_size);
SHOW_CPUDATA_UINT_NAME(l1_dcache_line_size, dcache_line_size);
SHOW_CPUDATA_UINT_NAME(l1_icache_size, icache_size);
SHOW_CPUDATA_UINT_NAME(l1_icache_line_size, icache_line_size);
SHOW_CPUDATA_UINT_NAME(l2_cache_size, ecache_size);
SHOW_CPUDATA_UINT_NAME(l2_cache_line_size, ecache_line_size);

static struct sysdev_attribute cpu_core_attrs[] = {
_SYSDEV_ATTR(clock_tick, 0444, show_clock_tick, NULL),
Expand All @@ -46,6 +212,8 @@ static struct sysdev_attribute cpu_core_attrs[] = {
_SYSDEV_ATTR(l2_cache_line_size, 0444, show_l2_cache_line_size, NULL),
};

static DEFINE_PER_CPU(struct cpu, cpu_devices);

static void register_cpu_online(unsigned int cpu)
{
struct cpu *c = &per_cpu(cpu_devices, cpu);
Expand All @@ -54,6 +222,8 @@ static void register_cpu_online(unsigned int cpu)

for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
sysdev_create_file(s, &cpu_core_attrs[i]);

register_mmu_stats(s);
}

#ifdef CONFIG_HOTPLUG_CPU
Expand All @@ -63,6 +233,7 @@ static void unregister_cpu_online(unsigned int cpu)
struct sys_device *s = &c->sysdev;
int i;

unregister_mmu_stats(s);
for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
sysdev_remove_file(s, &cpu_core_attrs[i]);
}
Expand Down Expand Up @@ -92,10 +263,24 @@ static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
.notifier_call = sysfs_cpu_notify,
};

static void __init check_mmu_stats(void)
{
unsigned long dummy1, err;

if (tlb_type != hypervisor)
return;

err = sun4v_mmustat_info(&dummy1);
if (!err)
mmu_stats_supported = 1;
}

static int __init topology_init(void)
{
int cpu;

check_mmu_stats();

register_cpu_notifier(&sysfs_cpu_nb);

for_each_possible_cpu(cpu) {
Expand Down
5 changes: 5 additions & 0 deletions include/asm-sparc64/hypervisor.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2798,6 +2798,11 @@ struct hv_mmu_statistics {
*/
#define HV_FAST_MMUSTAT_INFO 0x103

#ifndef __ASSEMBLY__
extern unsigned long sun4v_mmustat_conf(unsigned long ra, unsigned long *orig_ra);
extern unsigned long sun4v_mmustat_info(unsigned long *ra);
#endif

/* NCS crypto services */

/* ncs_request() sub-function numbers */
Expand Down

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