#define pr_fmt(fmt) "cpu: " fmt
#include <linux/cpufeature.h>
#include <linux/workqueue.h>
#include <linux/memblock.h>
#include <linux/uaccess.h>
#include <linux/sysctl.h>
#include <linux/cpuset.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/sched/topology.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/nodemask.h>
#include <linux/node.h>
#include <asm/hiperdispatch.h>
#include <asm/sysinfo.h>
#include <asm/asm.h>
#define PTF_HORIZONTAL (0UL)
#define PTF_VERTICAL (1UL)
#define PTF_CHECK (2UL)
enum {
TOPOLOGY_MODE_HW,
TOPOLOGY_MODE_SINGLE,
TOPOLOGY_MODE_PACKAGE,
TOPOLOGY_MODE_UNINITIALIZED
};
struct mask_info {
struct mask_info *next;
unsigned char id;
cpumask_t mask;
};
static int topology_mode = TOPOLOGY_MODE_UNINITIALIZED;
static void set_topology_timer(void);
static void topology_work_fn(struct work_struct *work);
static struct sysinfo_15_1_x *tl_info;
static int cpu_management;
static DECLARE_WORK(topology_work, topology_work_fn);
static struct mask_info socket_info;
static struct mask_info book_info;
static struct mask_info drawer_info;
struct cpu_topology_s390 cpu_topology[NR_CPUS];
EXPORT_SYMBOL_GPL(cpu_topology);
static void cpu_group_map(cpumask_t *dst, struct mask_info *info, unsigned int cpu)
{
static cpumask_t mask;
cpumask_clear(&mask);
if (!cpumask_test_cpu(cpu, &cpu_setup_mask))
goto out;
cpumask_set_cpu(cpu, &mask);
switch (topology_mode) {
case TOPOLOGY_MODE_HW:
while (info) {
if (cpumask_test_cpu(cpu, &info->mask)) {
cpumask_copy(&mask, &info->mask);
break;
}
info = info->next;
}
break;
case TOPOLOGY_MODE_PACKAGE:
cpumask_copy(&mask, cpu_present_mask);
break;
default:
fallthrough;
case TOPOLOGY_MODE_SINGLE:
break;
}
cpumask_and(&mask, &mask, &cpu_setup_mask);
out:
cpumask_copy(dst, &mask);
}
static void cpu_thread_map(cpumask_t *dst, unsigned int cpu)
{
static cpumask_t mask;
unsigned int max_cpu;
cpumask_clear(&mask);
if (!cpumask_test_cpu(cpu, &cpu_setup_mask))
goto out;
cpumask_set_cpu(cpu, &mask);
if (topology_mode != TOPOLOGY_MODE_HW)
goto out;
cpu -= cpu % (smp_cpu_mtid + 1);
max_cpu = min(cpu + smp_cpu_mtid, nr_cpu_ids - 1);
for (; cpu <= max_cpu; cpu++) {
if (cpumask_test_cpu(cpu, &cpu_setup_mask))
cpumask_set_cpu(cpu, &mask);
}
out:
cpumask_copy(dst, &mask);
}
#define TOPOLOGY_CORE_BITS 64
static void add_cpus_to_mask(struct topology_core *tl_core,
struct mask_info *drawer,
struct mask_info *book,
struct mask_info *socket)
{
struct cpu_topology_s390 *topo;
unsigned int core;
for_each_set_bit(core, &tl_core->mask, TOPOLOGY_CORE_BITS) {
unsigned int max_cpu, rcore;
int cpu;
rcore = TOPOLOGY_CORE_BITS - 1 - core + tl_core->origin;
cpu = smp_find_processor_id(rcore << smp_cpu_mt_shift);
if (cpu < 0)
continue;
max_cpu = min(cpu + smp_cpu_mtid, nr_cpu_ids - 1);
for (; cpu <= max_cpu; cpu++) {
topo = &cpu_topology[cpu];
topo->drawer_id = drawer->id;
topo->book_id = book->id;
topo->socket_id = socket->id;
topo->core_id = rcore;
topo->thread_id = cpu;
topo->dedicated = tl_core->d;
cpumask_set_cpu(cpu, &drawer->mask);
cpumask_set_cpu(cpu, &book->mask);
cpumask_set_cpu(cpu, &socket->mask);
smp_cpu_set_polarization(cpu, tl_core->pp);
smp_cpu_set_capacity(cpu, CPU_CAPACITY_HIGH);
}
}
}
static void clear_masks(void)
{
struct mask_info *info;
info = &socket_info;
while (info) {
cpumask_clear(&info->mask);
info = info->next;
}
info = &book_info;
while (info) {
cpumask_clear(&info->mask);
info = info->next;
}
info = &drawer_info;
while (info) {
cpumask_clear(&info->mask);
info = info->next;
}
}
static union topology_entry *next_tle(union topology_entry *tle)
{
if (!tle->nl)
return (union topology_entry *)((struct topology_core *)tle + 1);
return (union topology_entry *)((struct topology_container *)tle + 1);
}
static void tl_to_masks(struct sysinfo_15_1_x *info)
{
struct mask_info *socket = &socket_info;
struct mask_info *book = &book_info;
struct mask_info *drawer = &drawer_info;
union topology_entry *tle, *end;
clear_masks();
tle = info->tle;
end = (union topology_entry *)((unsigned long)info + info->length);
while (tle < end) {
switch (tle->nl) {
case 3:
drawer = drawer->next;
drawer->id = tle->container.id;
break;
case 2:
book = book->next;
book->id = tle->container.id;
break;
case 1:
socket = socket->next;
socket->id = tle->container.id;
break;
case 0:
add_cpus_to_mask(&tle->cpu, drawer, book, socket);
break;
default:
clear_masks();
return;
}
tle = next_tle(tle);
}
}
static void topology_update_polarization_simple(void)
{
int cpu;
for_each_possible_cpu(cpu)
smp_cpu_set_polarization(cpu, POLARIZATION_HRZ);
}
static int ptf(unsigned long fc)
{
int cc;
asm volatile(
" .insn rre,0xb9a20000,%[fc],%[fc]\n"
CC_IPM(cc)
: CC_OUT(cc, cc)
: [fc] "d" (fc)
: CC_CLOBBER);
return CC_TRANSFORM(cc);
}
int topology_set_cpu_management(int fc)
{
int cpu, rc;
if (!cpu_has_topology())
return -EOPNOTSUPP;
if (fc)
rc = ptf(PTF_VERTICAL);
else
rc = ptf(PTF_HORIZONTAL);
if (rc)
return -EBUSY;
for_each_possible_cpu(cpu)
smp_cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
return rc;
}
void update_cpu_masks(void)
{
struct cpu_topology_s390 *topo, *topo_package, *topo_sibling;
int cpu, sibling, pkg_first, smt_first, id;
for_each_possible_cpu(cpu) {
topo = &cpu_topology[cpu];
cpu_thread_map(&topo->thread_mask, cpu);
cpu_group_map(&topo->core_mask, &socket_info, cpu);
cpu_group_map(&topo->book_mask, &book_info, cpu);
cpu_group_map(&topo->drawer_mask, &drawer_info, cpu);
topo->booted_cores = 0;
if (topology_mode != TOPOLOGY_MODE_HW) {
id = topology_mode == TOPOLOGY_MODE_PACKAGE ? 0 : cpu;
topo->thread_id = cpu;
topo->core_id = cpu;
topo->socket_id = id;
topo->book_id = id;
topo->drawer_id = id;
}
}
hd_reset_state();
for_each_online_cpu(cpu) {
topo = &cpu_topology[cpu];
pkg_first = cpumask_first(&topo->core_mask);
topo_package = &cpu_topology[pkg_first];
if (cpu == pkg_first) {
for_each_cpu(sibling, &topo->core_mask) {
topo_sibling = &cpu_topology[sibling];
smt_first = cpumask_first(&topo_sibling->thread_mask);
if (sibling == smt_first) {
topo_package->booted_cores++;
hd_add_core(sibling);
}
}
} else {
topo->booted_cores = topo_package->booted_cores;
}
}
}
void store_topology(struct sysinfo_15_1_x *info)
{
stsi(info, 15, 1, topology_mnest_limit());
}
static void __arch_update_dedicated_flag(void *arg)
{
if (topology_cpu_dedicated(smp_processor_id()))
set_cpu_flag(CIF_DEDICATED_CPU);
else
clear_cpu_flag(CIF_DEDICATED_CPU);
}
static int __arch_update_cpu_topology(void)
{
struct sysinfo_15_1_x *info = tl_info;
int rc, hd_status;
hd_status = 0;
rc = 0;
mutex_lock(&smp_cpu_state_mutex);
if (cpu_has_topology()) {
rc = 1;
store_topology(info);
tl_to_masks(info);
}
update_cpu_masks();
if (!cpu_has_topology())
topology_update_polarization_simple();
if (cpu_management == 1)
hd_status = hd_enable_hiperdispatch();
mutex_unlock(&smp_cpu_state_mutex);
if (hd_status == 0)
hd_disable_hiperdispatch();
return rc;
}
int arch_update_cpu_topology(void)
{
int rc;
rc = __arch_update_cpu_topology();
on_each_cpu(__arch_update_dedicated_flag, NULL, 0);
return rc;
}
static void topology_work_fn(struct work_struct *work)
{
rebuild_sched_domains();
}
void topology_schedule_update(void)
{
schedule_work(&topology_work);
}
static void topology_flush_work(void)
{
flush_work(&topology_work);
}
static void topology_timer_fn(struct timer_list *unused)
{
if (ptf(PTF_CHECK))
topology_schedule_update();
set_topology_timer();
}
static struct timer_list topology_timer;
static atomic_t topology_poll = ATOMIC_INIT(0);
static void set_topology_timer(void)
{
if (atomic_add_unless(&topology_poll, -1, 0))
mod_timer(&topology_timer, jiffies + msecs_to_jiffies(100));
else
mod_timer(&topology_timer, jiffies + secs_to_jiffies(60));
}
void topology_expect_change(void)
{
if (!cpu_has_topology())
return;
if (atomic_read(&topology_poll) > 60)
return;
atomic_add(60, &topology_poll);
set_topology_timer();
}
static int set_polarization(int polarization)
{
int rc = 0;
cpus_read_lock();
mutex_lock(&smp_cpu_state_mutex);
if (cpu_management == polarization)
goto out;
rc = topology_set_cpu_management(polarization);
if (rc)
goto out;
cpu_management = polarization;
topology_expect_change();
out:
mutex_unlock(&smp_cpu_state_mutex);
cpus_read_unlock();
return rc;
}
static ssize_t dispatching_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
ssize_t count;
mutex_lock(&smp_cpu_state_mutex);
count = sysfs_emit(buf, "%d\n", cpu_management);
mutex_unlock(&smp_cpu_state_mutex);
return count;
}
static ssize_t dispatching_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
int val, rc;
char delim;
if (sscanf(buf, "%d %c", &val, &delim) != 1)
return -EINVAL;
if (val != 0 && val != 1)
return -EINVAL;
rc = set_polarization(val);
return rc ? rc : count;
}
static DEVICE_ATTR_RW(dispatching);
static ssize_t cpu_polarization_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int cpu = dev->id;
ssize_t count;
mutex_lock(&smp_cpu_state_mutex);
switch (smp_cpu_get_polarization(cpu)) {
case POLARIZATION_HRZ:
count = sysfs_emit(buf, "horizontal\n");
break;
case POLARIZATION_VL:
count = sysfs_emit(buf, "vertical:low\n");
break;
case POLARIZATION_VM:
count = sysfs_emit(buf, "vertical:medium\n");
break;
case POLARIZATION_VH:
count = sysfs_emit(buf, "vertical:high\n");
break;
default:
count = sysfs_emit(buf, "unknown\n");
break;
}
mutex_unlock(&smp_cpu_state_mutex);
return count;
}
static DEVICE_ATTR(polarization, 0444, cpu_polarization_show, NULL);
static struct attribute *topology_cpu_attrs[] = {
&dev_attr_polarization.attr,
NULL,
};
static struct attribute_group topology_cpu_attr_group = {
.attrs = topology_cpu_attrs,
};
static ssize_t cpu_dedicated_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int cpu = dev->id;
ssize_t count;
mutex_lock(&smp_cpu_state_mutex);
count = sysfs_emit(buf, "%d\n", topology_cpu_dedicated(cpu));
mutex_unlock(&smp_cpu_state_mutex);
return count;
}
static DEVICE_ATTR(dedicated, 0444, cpu_dedicated_show, NULL);
static struct attribute *topology_extra_cpu_attrs[] = {
&dev_attr_dedicated.attr,
NULL,
};
static struct attribute_group topology_extra_cpu_attr_group = {
.attrs = topology_extra_cpu_attrs,
};
int topology_cpu_init(struct cpu *cpu)
{
int rc;
rc = sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
if (rc || !cpu_has_topology())
return rc;
rc = sysfs_create_group(&cpu->dev.kobj, &topology_extra_cpu_attr_group);
if (rc)
sysfs_remove_group(&cpu->dev.kobj, &topology_cpu_attr_group);
return rc;
}
const struct cpumask *cpu_coregroup_mask(int cpu)
{
return &cpu_topology[cpu].core_mask;
}
static const struct cpumask *tl_book_mask(struct sched_domain_topology_level *tl, int cpu)
{
return &cpu_topology[cpu].book_mask;
}
static const struct cpumask *tl_drawer_mask(struct sched_domain_topology_level *tl, int cpu)
{
return &cpu_topology[cpu].drawer_mask;
}
static struct sched_domain_topology_level s390_topology[] = {
SDTL_INIT(tl_smt_mask, cpu_smt_flags, SMT),
SDTL_INIT(tl_mc_mask, cpu_core_flags, MC),
SDTL_INIT(tl_book_mask, NULL, BOOK),
SDTL_INIT(tl_drawer_mask, NULL, DRAWER),
SDTL_INIT(tl_pkg_mask, NULL, PKG),
{ NULL, },
};
static void __init alloc_masks(struct sysinfo_15_1_x *info,
struct mask_info *mask, int offset)
{
int i, nr_masks;
nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
for (i = 0; i < info->mnest - offset; i++)
nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
nr_masks = max(nr_masks, 1);
for (i = 0; i < nr_masks; i++) {
mask->next = memblock_alloc_or_panic(sizeof(*mask->next), 8);
mask = mask->next;
}
}
static int __init detect_polarization(union topology_entry *tle)
{
struct topology_core *tl_core;
while (tle->nl)
tle = next_tle(tle);
tl_core = (struct topology_core *)tle;
return tl_core->pp != POLARIZATION_HRZ;
}
void __init topology_init_early(void)
{
struct sysinfo_15_1_x *info;
set_sched_topology(s390_topology);
if (topology_mode == TOPOLOGY_MODE_UNINITIALIZED) {
if (cpu_has_topology())
topology_mode = TOPOLOGY_MODE_HW;
else
topology_mode = TOPOLOGY_MODE_SINGLE;
}
if (!cpu_has_topology())
goto out;
tl_info = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE);
info = tl_info;
store_topology(info);
cpu_management = detect_polarization(info->tle);
pr_info("The CPU configuration topology of the machine is: %d %d %d %d %d %d / %d\n",
info->mag[0], info->mag[1], info->mag[2], info->mag[3],
info->mag[4], info->mag[5], info->mnest);
alloc_masks(info, &socket_info, 1);
alloc_masks(info, &book_info, 2);
alloc_masks(info, &drawer_info, 3);
out:
cpumask_set_cpu(0, &cpu_setup_mask);
__arch_update_cpu_topology();
__arch_update_dedicated_flag(NULL);
}
static inline int topology_get_mode(int enabled)
{
if (!enabled)
return TOPOLOGY_MODE_SINGLE;
return cpu_has_topology() ? TOPOLOGY_MODE_HW : TOPOLOGY_MODE_PACKAGE;
}
static inline int topology_is_enabled(void)
{
return topology_mode != TOPOLOGY_MODE_SINGLE;
}
static int __init topology_setup(char *str)
{
bool enabled;
int rc;
rc = kstrtobool(str, &enabled);
if (rc)
return rc;
topology_mode = topology_get_mode(enabled);
return 0;
}
early_param("topology", topology_setup);
static int topology_ctl_handler(const struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int enabled = topology_is_enabled();
int new_mode;
int rc;
struct ctl_table ctl_entry = {
.procname = ctl->procname,
.data = &enabled,
.maxlen = sizeof(int),
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
};
rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
if (rc < 0 || !write)
return rc;
mutex_lock(&smp_cpu_state_mutex);
new_mode = topology_get_mode(enabled);
if (topology_mode != new_mode) {
topology_mode = new_mode;
topology_schedule_update();
}
mutex_unlock(&smp_cpu_state_mutex);
topology_flush_work();
return rc;
}
static int polarization_ctl_handler(const struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int polarization;
int rc;
struct ctl_table ctl_entry = {
.procname = ctl->procname,
.data = &polarization,
.maxlen = sizeof(int),
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
};
polarization = cpu_management;
rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
if (rc < 0 || !write)
return rc;
return set_polarization(polarization);
}
static const struct ctl_table topology_ctl_table[] = {
{
.procname = "topology",
.mode = 0644,
.proc_handler = topology_ctl_handler,
},
{
.procname = "polarization",
.mode = 0644,
.proc_handler = polarization_ctl_handler,
},
};
static int __init topology_init(void)
{
struct device *dev_root;
int rc = 0;
timer_setup(&topology_timer, topology_timer_fn, TIMER_DEFERRABLE);
if (cpu_has_topology())
set_topology_timer();
else
topology_update_polarization_simple();
if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY_VERTICAL))
set_polarization(1);
register_sysctl("s390", topology_ctl_table);
dev_root = bus_get_dev_root(&cpu_subsys);
if (dev_root) {
rc = device_create_file(dev_root, &dev_attr_dispatching);
put_device(dev_root);
}
return rc;
}
device_initcall(topology_init);
