arch/s390/kernel/topology.c - maze/linux - Git at Google

 /*
  *    Copyright IBM Corp. 2007
  *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
  */

 #define KMSG_COMPONENT "cpu"
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/bootmem.h>
 #include <linux/sched.h>
 #include <linux/workqueue.h>
 #include <linux/cpu.h>
 #include <linux/smp.h>
 #include <linux/cpuset.h>
 #include <asm/delay.h>
 #include <asm/s390_ext.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 int topology_enabled = 1;
 static void topology_work_fn(struct work_struct *work);
 static struct sysinfo_15_1_x *tl_info;
 static struct timer_list topology_timer;
 static void set_topology_timer(void);
 static DECLARE_WORK(topology_work, topology_work_fn);
 /* topology_lock protects the core linked list */
 static DEFINE_SPINLOCK(topology_lock);

 static struct mask_info core_info;
 cpumask_t cpu_core_map[NR_CPUS];
 unsigned char cpu_core_id[NR_CPUS];

 #ifdef CONFIG_SCHED_BOOK
 static struct mask_info book_info;
 cpumask_t cpu_book_map[NR_CPUS];
 unsigned char cpu_book_id[NR_CPUS];
 #endif

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

 	cpus_clear(mask);
 	if (!topology_enabled || !MACHINE_HAS_TOPOLOGY) {
 		cpumask_copy(&mask, cpumask_of(cpu));
 		return mask;
 	}
 	while (info) {
 		if (cpu_isset(cpu, info->mask)) {
 			mask = info->mask;
 			break;
 		}
 		info = info->next;
 	}
 	if (cpus_empty(mask))
 		mask = cpumask_of_cpu(cpu);
 	return mask;
 }

 static void add_cpus_to_mask(struct topology_cpu *tl_cpu,
 			     struct mask_info *book, struct mask_info *core)
 {
 	unsigned int cpu;

 	for (cpu = find_first_bit(&tl_cpu->mask[0], TOPOLOGY_CPU_BITS);
 	     cpu < TOPOLOGY_CPU_BITS;
 	     cpu = find_next_bit(&tl_cpu->mask[0], TOPOLOGY_CPU_BITS, cpu + 1))
 	{
 		unsigned int rcpu, lcpu;

 		rcpu = TOPOLOGY_CPU_BITS - 1 - cpu + tl_cpu->origin;
 		for_each_present_cpu(lcpu) {
 			if (cpu_logical_map(lcpu) != rcpu)
 				continue;
 #ifdef CONFIG_SCHED_BOOK
 			cpu_set(lcpu, book->mask);
 			cpu_book_id[lcpu] = book->id;
 #endif
 			cpu_set(lcpu, core->mask);
 			cpu_core_id[lcpu] = core->id;
 			smp_cpu_polarization[lcpu] = tl_cpu->pp;
 		}
 	}
 }

 static void clear_masks(void)
 {
 	struct mask_info *info;

 	info = &core_info;
 	while (info) {
 		cpus_clear(info->mask);
 		info = info->next;
 	}
 #ifdef CONFIG_SCHED_BOOK
 	info = &book_info;
 	while (info) {
 		cpus_clear(info->mask);
 		info = info->next;
 	}
 #endif
 }

 static union topology_entry *next_tle(union topology_entry *tle)
 {
 	if (!tle->nl)
 		return (union topology_entry *)((struct topology_cpu *)tle + 1);
 	return (union topology_entry *)((struct topology_container *)tle + 1);
 }

 static void tl_to_cores(struct sysinfo_15_1_x *info)
 {
 #ifdef CONFIG_SCHED_BOOK
 	struct mask_info *book = &book_info;
 #else
 	struct mask_info *book = NULL;
 #endif
 	struct mask_info *core = &core_info;
 	union topology_entry *tle, *end;


 	spin_lock_irq(&topology_lock);
 	clear_masks();
 	tle = info->tle;
 	end = (union topology_entry *)((unsigned long)info + info->length);
 	while (tle < end) {
 		switch (tle->nl) {
 #ifdef CONFIG_SCHED_BOOK
 		case 2:
 			book = book->next;
 			book->id = tle->container.id;
 			break;
 #endif
 		case 1:
 			core = core->next;
 			core->id = tle->container.id;
 			break;
 		case 0:
 			add_cpus_to_mask(&tle->cpu, book, core);
 			break;
 		default:
 			clear_masks();
 			goto out;
 		}
 		tle = next_tle(tle);
 	}
 out:
 	spin_unlock_irq(&topology_lock);
 }

 static void topology_update_polarization_simple(void)
 {
 	int cpu;

 	mutex_lock(&smp_cpu_state_mutex);
 	for_each_possible_cpu(cpu)
 		smp_cpu_polarization[cpu] = POLARIZATION_HRZ;
 	mutex_unlock(&smp_cpu_state_mutex);
 }

 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;
 }

 int topology_set_cpu_management(int fc)
 {
 	int cpu;
 	int 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_polarization[cpu] = POLARIZATION_UNKNWN;
 	return rc;
 }

 static void update_cpu_core_map(void)
 {
 	unsigned long flags;
 	int cpu;

 	spin_lock_irqsave(&topology_lock, flags);
 	for_each_possible_cpu(cpu) {
 		cpu_core_map[cpu] = cpu_group_map(&core_info, cpu);
 #ifdef CONFIG_SCHED_BOOK
 		cpu_book_map[cpu] = cpu_group_map(&book_info, cpu);
 #endif
 	}
 	spin_unlock_irqrestore(&topology_lock, flags);
 }

 void store_topology(struct sysinfo_15_1_x *info)
 {
 #ifdef CONFIG_SCHED_BOOK
 	int rc;

 	rc = stsi(info, 15, 1, 3);
 	if (rc != -ENOSYS)
 		return;
 #endif
 	stsi(info, 15, 1, 2);
 }

 int arch_update_cpu_topology(void)
 {
 	struct sysinfo_15_1_x *info = tl_info;
 	struct sys_device *sysdev;
 	int cpu;

 	if (!MACHINE_HAS_TOPOLOGY) {
 		update_cpu_core_map();
 		topology_update_polarization_simple();
 		return 0;
 	}
 	store_topology(info);
 	tl_to_cores(info);
 	update_cpu_core_map();
 	for_each_online_cpu(cpu) {
 		sysdev = get_cpu_sysdev(cpu);
 		kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
 	}
 	return 1;
 }

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

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

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

 static void set_topology_timer(void)
 {
 	topology_timer.function = topology_timer_fn;
 	topology_timer.data = 0;
 	topology_timer.expires = jiffies + 60 * HZ;
 	add_timer(&topology_timer);
 }

 static int __init early_parse_topology(char *p)
 {
 	if (strncmp(p, "off", 3))
 		return 0;
 	topology_enabled = 0;
 	return 0;
 }
 early_param("topology", early_parse_topology);

 static int __init init_topology_update(void)
 {
 	int rc;

 	rc = 0;
 	if (!MACHINE_HAS_TOPOLOGY) {
 		topology_update_polarization_simple();
 		goto out;
 	}
 	init_timer_deferrable(&topology_timer);
 	set_topology_timer();
 out:
 	update_cpu_core_map();
 	return rc;
 }
 __initcall(init_topology_update);

 static void 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 = alloc_bootmem(sizeof(struct mask_info));
 		mask = mask->next;
 	}
 }

 void __init s390_init_cpu_topology(void)
 {
 	struct sysinfo_15_1_x *info;
 	int i;

 	if (!MACHINE_HAS_TOPOLOGY)
 		return;
 	tl_info = alloc_bootmem_pages(PAGE_SIZE);
 	info = tl_info;
 	store_topology(info);
 	pr_info("The CPU configuration topology of the machine is:");
 	for (i = 0; i < TOPOLOGY_NR_MAG; i++)
 		printk(" %d", info->mag[i]);
 	printk(" / %d\n", info->mnest);
 	alloc_masks(info, &core_info, 2);
 #ifdef CONFIG_SCHED_BOOK
 	alloc_masks(info, &book_info, 3);
 #endif
 }
	/*
	* Copyright IBM Corp. 2007
	* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
	*/

	#define KMSG_COMPONENT "cpu"
	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

	#include <linux/kernel.h>
	#include <linux/mm.h>
	#include <linux/init.h>
	#include <linux/device.h>
	#include <linux/bootmem.h>
	#include <linux/sched.h>
	#include <linux/workqueue.h>
	#include <linux/cpu.h>
	#include <linux/smp.h>
	#include <linux/cpuset.h>
	#include <asm/delay.h>
	#include <asm/s390_ext.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 int topology_enabled = 1;
	static void topology_work_fn(struct work_struct *work);
	static struct sysinfo_15_1_x *tl_info;
	static struct timer_list topology_timer;
	static void set_topology_timer(void);
	static DECLARE_WORK(topology_work, topology_work_fn);
	/* topology_lock protects the core linked list */
	static DEFINE_SPINLOCK(topology_lock);

	static struct mask_info core_info;
	cpumask_t cpu_core_map[NR_CPUS];
	unsigned char cpu_core_id[NR_CPUS];

	#ifdef CONFIG_SCHED_BOOK
	static struct mask_info book_info;
	cpumask_t cpu_book_map[NR_CPUS];
	unsigned char cpu_book_id[NR_CPUS];
	#endif

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

	cpus_clear(mask);
	if (!topology_enabled \|\| !MACHINE_HAS_TOPOLOGY) {
	cpumask_copy(&mask, cpumask_of(cpu));
	return mask;
	}
	while (info) {
	if (cpu_isset(cpu, info->mask)) {
	mask = info->mask;
	break;
	}
	info = info->next;
	}
	if (cpus_empty(mask))
	mask = cpumask_of_cpu(cpu);
	return mask;
	}

	static void add_cpus_to_mask(struct topology_cpu *tl_cpu,
	struct mask_info book, struct mask_info core)
	{
	unsigned int cpu;

	for (cpu = find_first_bit(&tl_cpu->mask[0], TOPOLOGY_CPU_BITS);
	cpu < TOPOLOGY_CPU_BITS;
	cpu = find_next_bit(&tl_cpu->mask[0], TOPOLOGY_CPU_BITS, cpu + 1))
	{
	unsigned int rcpu, lcpu;

	rcpu = TOPOLOGY_CPU_BITS - 1 - cpu + tl_cpu->origin;
	for_each_present_cpu(lcpu) {
	if (cpu_logical_map(lcpu) != rcpu)
	continue;
	#ifdef CONFIG_SCHED_BOOK
	cpu_set(lcpu, book->mask);
	cpu_book_id[lcpu] = book->id;
	#endif
	cpu_set(lcpu, core->mask);
	cpu_core_id[lcpu] = core->id;
	smp_cpu_polarization[lcpu] = tl_cpu->pp;
	}
	}
	}

	static void clear_masks(void)
	{
	struct mask_info *info;

	info = &core_info;
	while (info) {
	cpus_clear(info->mask);
	info = info->next;
	}
	#ifdef CONFIG_SCHED_BOOK
	info = &book_info;
	while (info) {
	cpus_clear(info->mask);
	info = info->next;
	}
	#endif
	}

	static union topology_entry next_tle(union topology_entry tle)
	{
	if (!tle->nl)
	return (union topology_entry )((struct topology_cpu )tle + 1);
	return (union topology_entry )((struct topology_container )tle + 1);
	}

	static void tl_to_cores(struct sysinfo_15_1_x *info)
	{
	#ifdef CONFIG_SCHED_BOOK
	struct mask_info *book = &book_info;
	#else
	struct mask_info *book = NULL;
	#endif
	struct mask_info *core = &core_info;
	union topology_entry tle, end;


	spin_lock_irq(&topology_lock);
	clear_masks();
	tle = info->tle;
	end = (union topology_entry *)((unsigned long)info + info->length);
	while (tle < end) {
	switch (tle->nl) {
	#ifdef CONFIG_SCHED_BOOK
	case 2:
	book = book->next;
	book->id = tle->container.id;
	break;
	#endif
	case 1:
	core = core->next;
	core->id = tle->container.id;
	break;
	case 0:
	add_cpus_to_mask(&tle->cpu, book, core);
	break;
	default:
	clear_masks();
	goto out;
	}
	tle = next_tle(tle);
	}
	out:
	spin_unlock_irq(&topology_lock);
	}

	static void topology_update_polarization_simple(void)
	{
	int cpu;

	mutex_lock(&smp_cpu_state_mutex);
	for_each_possible_cpu(cpu)
	smp_cpu_polarization[cpu] = POLARIZATION_HRZ;
	mutex_unlock(&smp_cpu_state_mutex);
	}

	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;
	}

	int topology_set_cpu_management(int fc)
	{
	int cpu;
	int 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_polarization[cpu] = POLARIZATION_UNKNWN;
	return rc;
	}

	static void update_cpu_core_map(void)
	{
	unsigned long flags;
	int cpu;

	spin_lock_irqsave(&topology_lock, flags);
	for_each_possible_cpu(cpu) {
	cpu_core_map[cpu] = cpu_group_map(&core_info, cpu);
	#ifdef CONFIG_SCHED_BOOK
	cpu_book_map[cpu] = cpu_group_map(&book_info, cpu);
	#endif
	}
	spin_unlock_irqrestore(&topology_lock, flags);
	}

	void store_topology(struct sysinfo_15_1_x *info)
	{
	#ifdef CONFIG_SCHED_BOOK
	int rc;

	rc = stsi(info, 15, 1, 3);
	if (rc != -ENOSYS)
	return;
	#endif
	stsi(info, 15, 1, 2);
	}

	int arch_update_cpu_topology(void)
	{
	struct sysinfo_15_1_x *info = tl_info;
	struct sys_device *sysdev;
	int cpu;

	if (!MACHINE_HAS_TOPOLOGY) {
	update_cpu_core_map();
	topology_update_polarization_simple();
	return 0;
	}
	store_topology(info);
	tl_to_cores(info);
	update_cpu_core_map();
	for_each_online_cpu(cpu) {
	sysdev = get_cpu_sysdev(cpu);
	kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
	}
	return 1;
	}

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

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

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

	static void set_topology_timer(void)
	{
	topology_timer.function = topology_timer_fn;
	topology_timer.data = 0;
	topology_timer.expires = jiffies + 60 * HZ;
	add_timer(&topology_timer);
	}

	static int __init early_parse_topology(char *p)
	{
	if (strncmp(p, "off", 3))
	return 0;
	topology_enabled = 0;
	return 0;
	}
	early_param("topology", early_parse_topology);

	static int __init init_topology_update(void)
	{
	int rc;

	rc = 0;
	if (!MACHINE_HAS_TOPOLOGY) {
	topology_update_polarization_simple();
	goto out;
	}
	init_timer_deferrable(&topology_timer);
	set_topology_timer();
	out:
	update_cpu_core_map();
	return rc;
	}
	__initcall(init_topology_update);

	static void 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 = alloc_bootmem(sizeof(struct mask_info));
	mask = mask->next;
	}
	}

	void __init s390_init_cpu_topology(void)
	{
	struct sysinfo_15_1_x *info;
	int i;

	if (!MACHINE_HAS_TOPOLOGY)
	return;
	tl_info = alloc_bootmem_pages(PAGE_SIZE);
	info = tl_info;
	store_topology(info);
	pr_info("The CPU configuration topology of the machine is:");
	for (i = 0; i < TOPOLOGY_NR_MAG; i++)
	printk(" %d", info->mag[i]);
	printk(" / %d\n", info->mnest);
	alloc_masks(info, &core_info, 2);
	#ifdef CONFIG_SCHED_BOOK
	alloc_masks(info, &book_info, 3);
	#endif
	}