Quelle  sysfs.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* 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",
};

static long read_mmustat_enable(void *data __maybe_unused)
{
 unsigned long ra = 0;

 sun4v_mmustat_info(&ra);

 return ra != 0;
}

static long write_mmustat_enable(void *data)
{
 unsigned long ra, orig_ra, *val = data;

 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)
{
 long val = work_on_cpu(s->id, read_mmustat_enable, NULL);

 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;
 long err;
 int ret;

 ret = sscanf(buf, "%lu", &val);
 if (ret != 1)
  return -EINVAL;

 err = work_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 int __init topology_init(void)
{
 int cpu, ret;

 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);