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linux/arch/sparc/kernel/sysfs.c
Sebastian Andrzej Siewior e5355cd6e7 sparc/sysfs: Convert to hotplug state machine 
Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

The previous convention of keeping the files around until the CPU is dead
has not been preserved as there is no point to keep them available when the
cpu is going down. This makes the hotplug call symmetric.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Cc: rt@linuxtronix.de
Link: http://lkml.kernel.org/r/20161117183541.8588-18-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-11-22 23:34:42 +01:00

294 lines
8.4 KiB
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/* sysfs.c: Topology sysfs support code for sparc64.
*
* Copyright (C) 2007 David S. Miller <davem@davemloft.net>
*/
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/percpu.h>
#include <linux/init.h>
#include <asm/cpudata.h>
#include <asm/hypervisor.h>
#include <asm/spitfire.h>
static DEFINE_PER_CPU(struct hv_mmu_statistics, mmu_stats) __attribute__((aligned(64)));
#define SHOW_MMUSTAT_ULONG(NAME) \
static ssize_t show_##NAME(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct hv_mmu_statistics *p = &per_cpu(mmu_stats, dev->id); \
return sprintf(buf, "%lu\n", p->NAME); \
} \
static DEVICE_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[] = {
&dev_attr_immu_tsb_hits_ctx0_8k_tte.attr,
&dev_attr_immu_tsb_ticks_ctx0_8k_tte.attr,
&dev_attr_immu_tsb_hits_ctx0_64k_tte.attr,
&dev_attr_immu_tsb_ticks_ctx0_64k_tte.attr,
&dev_attr_immu_tsb_hits_ctx0_4mb_tte.attr,
&dev_attr_immu_tsb_ticks_ctx0_4mb_tte.attr,
&dev_attr_immu_tsb_hits_ctx0_256mb_tte.attr,
&dev_attr_immu_tsb_ticks_ctx0_256mb_tte.attr,
&dev_attr_immu_tsb_hits_ctxnon0_8k_tte.attr,
&dev_attr_immu_tsb_ticks_ctxnon0_8k_tte.attr,
&dev_attr_immu_tsb_hits_ctxnon0_64k_tte.attr,
&dev_attr_immu_tsb_ticks_ctxnon0_64k_tte.attr,
&dev_attr_immu_tsb_hits_ctxnon0_4mb_tte.attr,
&dev_attr_immu_tsb_ticks_ctxnon0_4mb_tte.attr,
&dev_attr_immu_tsb_hits_ctxnon0_256mb_tte.attr,
&dev_attr_immu_tsb_ticks_ctxnon0_256mb_tte.attr,
&dev_attr_dmmu_tsb_hits_ctx0_8k_tte.attr,
&dev_attr_dmmu_tsb_ticks_ctx0_8k_tte.attr,
&dev_attr_dmmu_tsb_hits_ctx0_64k_tte.attr,
&dev_attr_dmmu_tsb_ticks_ctx0_64k_tte.attr,
&dev_attr_dmmu_tsb_hits_ctx0_4mb_tte.attr,
&dev_attr_dmmu_tsb_ticks_ctx0_4mb_tte.attr,
&dev_attr_dmmu_tsb_hits_ctx0_256mb_tte.attr,
&dev_attr_dmmu_tsb_ticks_ctx0_256mb_tte.attr,
&dev_attr_dmmu_tsb_hits_ctxnon0_8k_tte.attr,
&dev_attr_dmmu_tsb_ticks_ctxnon0_8k_tte.attr,
&dev_attr_dmmu_tsb_hits_ctxnon0_64k_tte.attr,
&dev_attr_dmmu_tsb_ticks_ctxnon0_64k_tte.attr,
&dev_attr_dmmu_tsb_hits_ctxnon0_4mb_tte.attr,
&dev_attr_dmmu_tsb_ticks_ctxnon0_4mb_tte.attr,
&dev_attr_dmmu_tsb_hits_ctxnon0_256mb_tte.attr,
&dev_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;
unsigned long ret;
cpumask_copy(&old_affinity, tsk_cpus_allowed(current));
/* should return -EINVAL to userspace */
if (set_cpus_allowed_ptr(current, cpumask_of(cpu)))
return 0;
ret = func(arg);
set_cpus_allowed_ptr(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 device *s,
struct device_attribute *attr, 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 device *s,
struct device_attribute *attr, const char *buf,
size_t count)
{
unsigned long val, err;
int ret = sscanf(buf, "%lu", &val);
if (ret != 1)
return -EINVAL;
err = run_on_cpu(s->id, write_mmustat_enable, val);
if (err)
return -EIO;
return count;
}
static DEVICE_ATTR(mmustat_enable, 0644, show_mmustat_enable, store_mmustat_enable);
static int mmu_stats_supported;
static int register_mmu_stats(struct device *s)
{
if (!mmu_stats_supported)
return 0;
device_create_file(s, &dev_attr_mmustat_enable);
return sysfs_create_group(&s->kobj, &mmu_stat_group);
}
#ifdef CONFIG_HOTPLUG_CPU
static void unregister_mmu_stats(struct device *s)
{
if (!mmu_stats_supported)
return;
sysfs_remove_group(&s->kobj, &mmu_stat_group);
device_remove_file(s, &dev_attr_mmustat_enable);
}
#endif
#define SHOW_CPUDATA_ULONG_NAME(NAME, MEMBER) \
static ssize_t show_##NAME(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
cpuinfo_sparc *c = &cpu_data(dev->id); \
return sprintf(buf, "%lu\n", c->MEMBER); \
}
#define SHOW_CPUDATA_UINT_NAME(NAME, MEMBER) \
static ssize_t show_##NAME(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
cpuinfo_sparc *c = &cpu_data(dev->id); \
return sprintf(buf, "%u\n", c->MEMBER); \
}
SHOW_CPUDATA_ULONG_NAME(clock_tick, clock_tick);
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 device_attribute cpu_core_attrs[] = {
__ATTR(clock_tick, 0444, show_clock_tick, NULL),
__ATTR(l1_dcache_size, 0444, show_l1_dcache_size, NULL),
__ATTR(l1_dcache_line_size, 0444, show_l1_dcache_line_size, NULL),
__ATTR(l1_icache_size, 0444, show_l1_icache_size, NULL),
__ATTR(l1_icache_line_size, 0444, show_l1_icache_line_size, NULL),
__ATTR(l2_cache_size, 0444, show_l2_cache_size, NULL),
__ATTR(l2_cache_line_size, 0444, show_l2_cache_line_size, NULL),
};
static DEFINE_PER_CPU(struct cpu, cpu_devices);
static int register_cpu_online(unsigned int cpu)
{
struct cpu *c = &per_cpu(cpu_devices, cpu);
struct device *s = &c->dev;
int i;
for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
device_create_file(s, &cpu_core_attrs[i]);
register_mmu_stats(s);
return 0;
}
static int unregister_cpu_online(unsigned int cpu)
{
#ifdef CONFIG_HOTPLUG_CPU
struct cpu *c = &per_cpu(cpu_devices, cpu);
struct device *s = &c->dev;
int i;
unregister_mmu_stats(s);
for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
device_remove_file(s, &cpu_core_attrs[i]);
#endif
return 0;
}
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 void register_nodes(void)
{
#ifdef CONFIG_NUMA
int i;
for (i = 0; i < MAX_NUMNODES; i++)
register_one_node(i);
#endif
}
static int __init topology_init(void)
{
int cpu, ret;
register_nodes();
check_mmu_stats();
for_each_possible_cpu(cpu) {
struct cpu *c = &per_cpu(cpu_devices, cpu);
register_cpu(c, cpu);
}
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "sparc/topology:online",
register_cpu_online, unregister_cpu_online);
WARN_ON(ret < 0);
return 0;
}
subsys_initcall(topology_init);
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