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linux/arch/sparc/kernel/sysfs.c
David Hildenbrand 2848a28b0a drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 
...  and call node_dev_init() after memory_dev_init() from driver_init(),
so before any of the existing arch/subsys calls.  All online nodes should
be known at that point: early during boot, arch code determines node and
zone ranges and sets the relevant nodes online; usually this happens in
setup_arch().

This is in line with memory_dev_init(), which initializes the memory
device subsystem and creates all memory block devices.

Similar to memory_dev_init(), panic() if anything goes wrong, we don't
want to continue with such basic initialization errors.

The important part is that node_dev_init() gets called after
memory_dev_init() and after cpu_dev_init(), but before any of the relevant
archs call register_cpu() to register the new cpu device under the node
device.  The latter should be the case for the current users of
topology_init().

Link: https://lkml.kernel.org/r/20220203105212.30385-1-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Tested-by: Anatoly Pugachev <matorola@gmail.com> (sparc64)
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-03-22 15:57:10 -07:00

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// 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);
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