Release 4.11 arch/s390/kernel/topology.c

Directory: arch/s390/kernel
/*
 *    Copyright IBM Corp. 2007, 2011
 *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 */


#define KMSG_COMPONENT "cpu"

#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/workqueue.h>
#include <linux/bootmem.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/sysinfo.h>
#include <asm/numa.h>


#define PTF_HORIZONTAL	(0UL)

#define PTF_VERTICAL	(1UL)

#define PTF_CHECK	(2UL)


struct mask_info {
	
struct mask_info *next;
	
unsigned char id;
	
cpumask_t mask;
};

static void set_topology_timer(void);
static void topology_work_fn(struct work_struct *work);

static struct sysinfo_15_1_x *tl_info;

static DECLARE_WORK(topology_work, topology_work_fn);

/*
 * Socket/Book linked lists and cpu_topology updates are
 * protected by "sched_domains_mutex".
 */

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);


cpumask_t cpus_with_topology;



static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
{
	cpumask_t mask;

	cpumask_copy(&mask, cpumask_of(cpu));
	if (!MACHINE_HAS_TOPOLOGY)
		return mask;
	for (; info; info = info->next) {
		if (cpumask_test_cpu(cpu, &info->mask))
			return info->mask;
	}
	return mask;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 66 94.29% 5 71.43%
Motohiro Kosaki 3 4.29% 1 14.29%
Rusty Russell 1 1.43% 1 14.29%
Total 70 100.00% 7 100.00%



static cpumask_t cpu_thread_map(unsigned int cpu)
{
	cpumask_t mask;
	int i;

	cpumask_copy(&mask, cpumask_of(cpu));
	if (!MACHINE_HAS_TOPOLOGY)
		return mask;
	cpu -= cpu % (smp_cpu_mtid + 1);
	for (i = 0; i <= smp_cpu_mtid; i++)
		if (cpu_present(cpu + i))
			cpumask_set_cpu(cpu + i, &mask);
	return mask;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Schwidefsky 80 100.00% 1 100.00%
Total 80 100.00% 1 100.00%



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[0], TOPOLOGY_CORE_BITS) {
		unsigned int rcore;
		int lcpu, i;

		rcore = TOPOLOGY_CORE_BITS - 1 - core + tl_core->origin;
		lcpu = smp_find_processor_id(rcore << smp_cpu_mt_shift);
		if (lcpu < 0)
			continue;
		for (i = 0; i <= smp_cpu_mtid; i++) {
			topo = &cpu_topology[lcpu + i];
			topo->drawer_id = drawer->id;
			topo->book_id = book->id;
			topo->socket_id = socket->id;
			topo->core_id = rcore;
			topo->thread_id = lcpu + i;
			cpumask_set_cpu(lcpu + i, &drawer->mask);
			cpumask_set_cpu(lcpu + i, &book->mask);
			cpumask_set_cpu(lcpu + i, &socket->mask);
			cpumask_set_cpu(lcpu + i, &cpus_with_topology);
			smp_cpu_set_polarization(lcpu + i, tl_core->pp);
		}
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 133 65.20% 11 73.33%
Martin Schwidefsky 67 32.84% 2 13.33%
Motohiro Kosaki 2 0.98% 1 6.67%
Wei Yongjun 2 0.98% 1 6.67%
Total 204 100.00% 15 100.00%



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;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 84 95.45% 4 80.00%
Motohiro Kosaki 4 4.55% 1 20.00%
Total 88 100.00% 5 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 53 98.15% 2 66.67%
Martin Schwidefsky 1 1.85% 1 33.33%
Total 54 100.00% 3 100.00%



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);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 177 100.00% 9 100.00%
Total 177 100.00% 9 100.00%



static void topology_update_polarization_simple(void)
{
	int cpu;

	mutex_lock(&smp_cpu_state_mutex);
	for_each_possible_cpu(cpu)
		smp_cpu_set_polarization(cpu, POLARIZATION_HRZ);
	mutex_unlock(&smp_cpu_state_mutex);
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 34 100.00% 4 100.00%
Total 34 100.00% 4 100.00%



static int ptf(unsigned long fc)
{
	int rc;

	asm volatile(
                "       .insn   rre,0xb9a20000,%1,%1\n"
                "       ipm     %0\n"
                "       srl     %0,28\n"
                : "=d" (rc)
                : "d" (fc)  : "cc");
	return rc;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 19 100.00% 2 100.00%
Total 19 100.00% 2 100.00%



int topology_set_cpu_management(int fc)
{
	int cpu, rc;

	if (!MACHINE_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;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 63 100.00% 6 100.00%
Total 63 100.00% 6 100.00%



static void update_cpu_masks(void)
{
	struct cpu_topology_s390 *topo;
	int cpu;

	for_each_possible_cpu(cpu) {
		topo = &cpu_topology[cpu];
		topo->thread_mask = cpu_thread_map(cpu);
		topo->core_mask = cpu_group_map(&socket_info, cpu);
		topo->book_mask = cpu_group_map(&book_info, cpu);
		topo->drawer_mask = cpu_group_map(&drawer_info, cpu);
		if (!MACHINE_HAS_TOPOLOGY) {
			topo->thread_id = cpu;
			topo->core_id = cpu;
			topo->socket_id = cpu;
			topo->book_id = cpu;
			topo->drawer_id = cpu;
			if (cpu_present(cpu))
				cpumask_set_cpu(cpu, &cpus_with_topology);
		}
	}
	numa_update_cpu_topology();
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 116 89.23% 8 80.00%
Martin Schwidefsky 11 8.46% 1 10.00%
Philipp Hachtmann 3 2.31% 1 10.00%
Total 130 100.00% 10 100.00%



void store_topology(struct sysinfo_15_1_x *info)
{
	stsi(info, 15, 1, min(topology_max_mnest, 4));
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 26 100.00% 4 100.00%
Total 26 100.00% 4 100.00%



static int __arch_update_cpu_topology(void)
{
	struct sysinfo_15_1_x *info = tl_info;
	int rc = 0;

	cpumask_clear(&cpus_with_topology);
	if (MACHINE_HAS_TOPOLOGY) {
		rc = 1;
		store_topology(info);
		tl_to_masks(info);
	}
	update_cpu_masks();
	if (!MACHINE_HAS_TOPOLOGY)
		topology_update_polarization_simple();
	return rc;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 45 75.00% 9 90.00%
Philipp Hachtmann 15 25.00% 1 10.00%
Total 60 100.00% 10 100.00%



int arch_update_cpu_topology(void)
{
	struct device *dev;
	int cpu, rc;

	rc = __arch_update_cpu_topology();
	for_each_online_cpu(cpu) {
		dev = get_cpu_device(cpu);
		kobject_uevent(&dev->kobj, KOBJ_CHANGE);
	}
	return rc;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 44 91.67% 3 60.00%
Kay Sievers 3 6.25% 1 20.00%
Philipp Hachtmann 1 2.08% 1 20.00%
Total 48 100.00% 5 100.00%



static void topology_work_fn(struct work_struct *work)
{
	rebuild_sched_domains();
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 13 92.86% 2 66.67%
Oleg Nesterov 1 7.14% 1 33.33%
Total 14 100.00% 3 100.00%



void topology_schedule_update(void)
{
	schedule_work(&topology_work);
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 13 100.00% 1 100.00%
Total 13 100.00% 1 100.00%



static void topology_timer_fn(unsigned long ignored)
{
	if (ptf(PTF_CHECK))
		topology_schedule_update();
	set_topology_timer();
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 23 100.00% 2 100.00%
Total 23 100.00% 2 100.00%


static struct timer_list topology_timer =
	TIMER_DEFERRED_INITIALIZER(topology_timer_fn, 0, 0);


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 + HZ / 10);
	else
		mod_timer(&topology_timer, jiffies + HZ * 60);
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 46 100.00% 2 100.00%
Total 46 100.00% 2 100.00%



void topology_expect_change(void)
{
	if (!MACHINE_HAS_TOPOLOGY)
		return;
	/* This is racy, but it doesn't matter since it is just a heuristic.
         * Worst case is that we poll in a higher frequency for a bit longer.
         */
	if (atomic_read(&topology_poll) > 60)
		return;
	atomic_add(60, &topology_poll);
	set_topology_timer();
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 36 100.00% 2 100.00%
Total 36 100.00% 2 100.00%


static int cpu_management;



static ssize_t dispatching_show(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{
	ssize_t count;

	mutex_lock(&smp_cpu_state_mutex);
	count = sprintf(buf, "%d\n", cpu_management);
	mutex_unlock(&smp_cpu_state_mutex);
	return count;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 49 100.00% 3 100.00%
Total 49 100.00% 3 100.00%



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 = 0;
	get_online_cpus();
	mutex_lock(&smp_cpu_state_mutex);
	if (cpu_management == val)
		goto out;
	rc = topology_set_cpu_management(val);
	if (rc)
		goto out;
	cpu_management = val;
	topology_expect_change();
out:
	mutex_unlock(&smp_cpu_state_mutex);
	put_online_cpus();
	return rc ? rc : count;
}
Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 127 99.22% 4 80.00%
Philipp Hachtmann 1 0.78% 1 20.00%
Total 128 100.00% 5 100.00%

static DEVICE_ATTR(dispatching, 0644, dispatching_show,
			 dispatching_store);



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 = sprintf(buf, "horizontal\n");
		break;
	case POLARIZATION_VL:
		count = sprintf(buf, "vertical:low\n");
		break;
	case POLARIZATION_VM:
		count = sprintf(buf, "vertical:medium\n");
		break;
	case POLARIZATION_VH:
		count = sprintf(buf, "vertical:high\n");
		break;
	default:
		count = sprintf(buf, "unknown\n");
		break;
	}
	mutex_unlock(&smp_cpu_state_mutex);
	return count;
}
Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 115 98.29% 2 66.67%
Linus Torvalds 2 1.71% 1 33.33%
Total 117 100.00% 3 100.00%

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,
};



int topology_cpu_init(struct cpu *cpu)
{
	return sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 23 95.83% 1 50.00%
Linus Torvalds 1 4.17% 1 50.00%
Total 24 100.00% 2 100.00%



static const struct cpumask *cpu_thread_mask(int cpu)
{
	return &cpu_topology[cpu].thread_mask;
}


Contributors
Person Tokens Prop Commits CommitProp
Martin Schwidefsky 18 85.71% 1 33.33%
Heiko Carstens 3 14.29% 2 66.67%
Total 21 100.00% 3 100.00%



const struct cpumask *cpu_coregroup_mask(int cpu)
{
	return &cpu_topology[cpu].core_mask;
}

Contributors
Person Tokens Prop Commits CommitProp
Vincent Guittot 18 90.00% 1 50.00%
Heiko Carstens 2 10.00% 1 50.00%
Total 20 100.00% 2 100.00%



static const struct cpumask *cpu_book_mask(int cpu)
{
	return &cpu_topology[cpu].book_mask;
}

Contributors
Person Tokens Prop Commits CommitProp
Vincent Guittot 19 90.48% 1 50.00%
Heiko Carstens 2 9.52% 1 50.00%
Total 21 100.00% 2 100.00%



static const struct cpumask *cpu_drawer_mask(int cpu)
{
	return &cpu_topology[cpu].drawer_mask;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 21 100.00% 2 100.00%
Total 21 100.00% 2 100.00%


static struct sched_domain_topology_level s390_topology[] = {
	{ cpu_thread_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
	{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
	{ cpu_book_mask, SD_INIT_NAME(BOOK) },
	{ cpu_drawer_mask, SD_INIT_NAME(DRAWER) },
	{ cpu_cpu_mask, SD_INIT_NAME(DIE) },
	{ 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_virt_alloc(sizeof(*mask->next), 8);
		mask = mask->next;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 115 100.00% 2 100.00%
Total 115 100.00% 2 100.00%



void __init topology_init_early(void)
{
	struct sysinfo_15_1_x *info;

	set_sched_topology(s390_topology);
	if (!MACHINE_HAS_TOPOLOGY)
		goto out;
	tl_info = memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE);
	info = tl_info;
	store_topology(info);
	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:
	__arch_update_cpu_topology();
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 128 98.46% 6 75.00%
Martin Schwidefsky 1 0.77% 1 12.50%
Vincent Guittot 1 0.77% 1 12.50%
Total 130 100.00% 8 100.00%



static int __init topology_init(void)
{
	if (MACHINE_HAS_TOPOLOGY)
		set_topology_timer();
	else
		topology_update_polarization_simple();
	return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
}
Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 20 64.52% 1 50.00%
Martin Schwidefsky 11 35.48% 1 50.00%
Total 31 100.00% 2 100.00%


device_initcall(topology_init);
Overall Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 1817 83.96% 32 66.67%
Martin Schwidefsky 214 9.89% 5 10.42%
Vincent Guittot 70 3.23% 1 2.08%
Philipp Hachtmann 29 1.34% 2 4.17%
Motohiro Kosaki 9 0.42% 1 2.08%
Michael Holzheu 9 0.42% 1 2.08%
Linus Torvalds 6 0.28% 1 2.08%
Ingo Molnar 3 0.14% 1 2.08%
Kay Sievers 3 0.14% 1 2.08%
Wei Yongjun 2 0.09% 1 2.08%
Rusty Russell 1 0.05% 1 2.08%
Oleg Nesterov 1 0.05% 1 2.08%
Total 2164 100.00% 48 100.00%
Directory: arch/s390/kernel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Heiko Carstens	66	94.29%	5	71.43%
Motohiro Kosaki	3	4.29%	1	14.29%
Rusty Russell	1	1.43%	1	14.29%
Total	70	100.00%	7	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 arch/s390/kernel/topology.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
