Release 4.14 arch/s390/kernel/smp.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  SMP related functions
 *
 *    Copyright IBM Corp. 1999, 2012
 *    Author(s): Denis Joseph Barrow,
 *               Martin Schwidefsky <schwidefsky@de.ibm.com>,
 *               Heiko Carstens <heiko.carstens@de.ibm.com>,
 *
 *  based on other smp stuff by
 *    (c) 1995 Alan Cox, CymruNET Ltd  <alan@cymru.net>
 *    (c) 1998 Ingo Molnar
 *
 * The code outside of smp.c uses logical cpu numbers, only smp.c does
 * the translation of logical to physical cpu ids. All new code that
 * operates on physical cpu numbers needs to go into smp.c.
 */


#define KMSG_COMPONENT "cpu"

#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/workqueue.h>
#include <linux/bootmem.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/kernel_stat.h>
#include <linux/kmemleak.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irqflags.h>
#include <linux/cpu.h>
#include <linux/slab.h>
#include <linux/sched/hotplug.h>
#include <linux/sched/task_stack.h>
#include <linux/crash_dump.h>
#include <linux/memblock.h>
#include <asm/asm-offsets.h>
#include <asm/diag.h>
#include <asm/switch_to.h>
#include <asm/facility.h>
#include <asm/ipl.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/tlbflush.h>
#include <asm/vtimer.h>
#include <asm/lowcore.h>
#include <asm/sclp.h>
#include <asm/vdso.h>
#include <asm/debug.h>
#include <asm/os_info.h>
#include <asm/sigp.h>
#include <asm/idle.h>
#include <asm/nmi.h>
#include "entry.h"

enum {
	
ec_schedule = 0,
	
ec_call_function_single,
	
ec_stop_cpu,
};

enum {
	
CPU_STATE_STANDBY,
	
CPU_STATE_CONFIGURED,
};

static DEFINE_PER_CPU(struct cpu *, cpu_device);


struct pcpu {
	
struct lowcore *lowcore;	/* lowcore page(s) for the cpu */
	
unsigned long ec_mask;		/* bit mask for ec_xxx functions */
	
unsigned long ec_clk;		/* sigp timestamp for ec_xxx */
	
signed char state;		/* physical cpu state */
	
signed char polarization;	/* physical polarization */
	
u16 address;			/* physical cpu address */
};


static u8 boot_core_type;

static struct pcpu pcpu_devices[NR_CPUS];


static struct kmem_cache *pcpu_mcesa_cache;


unsigned int smp_cpu_mt_shift;

EXPORT_SYMBOL(smp_cpu_mt_shift);


unsigned int smp_cpu_mtid;

EXPORT_SYMBOL(smp_cpu_mtid);

#ifdef CONFIG_CRASH_DUMP

__vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
#endif


static unsigned int smp_max_threads __initdata = -1U;



static int __init early_nosmt(char *s)
{
	smp_max_threads = 1;
	return 0;
}
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early_param("nosmt", early_nosmt);



static int __init early_smt(char *s)
{
	get_option(&s, &smp_max_threads);
	return 0;
}
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early_param("smt", early_smt);

/*
 * The smp_cpu_state_mutex must be held when changing the state or polarization
 * member of a pcpu data structure within the pcpu_devices arreay.
 */

DEFINE_MUTEX(smp_cpu_state_mutex);

/*
 * Signal processor helper functions.
 */


static inline int __pcpu_sigp_relax(u16 addr, u8 order, unsigned long parm)
{
	int cc;

	while (1) {
		cc = __pcpu_sigp(addr, order, parm, NULL);
		if (cc != SIGP_CC_BUSY)
			return cc;
		cpu_relax();
	}
}

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3
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2
3.92%
1
20.00%
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51
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5
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static int pcpu_sigp_retry(struct pcpu *pcpu, u8 order, u32 parm)
{
	int cc, retry;

	for (retry = 0; ; retry++) {
		cc = __pcpu_sigp(pcpu->address, order, parm, NULL);
		if (cc != SIGP_CC_BUSY)
			break;
		if (retry >= 3)
			udelay(10);
	}
	return cc;
}

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21.43%
1
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2
2.86%
2
50.00%
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70
100.00%
4
100.00%



static inline int pcpu_stopped(struct pcpu *pcpu)
{
	u32 uninitialized_var(status);

	if (__pcpu_sigp(pcpu->address, SIGP_SENSE,
			0, &status) != SIGP_CC_STATUS_STORED)
		return 0;
	return !!(status & (SIGP_STATUS_CHECK_STOP|SIGP_STATUS_STOPPED));
}

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7
13.46%
1
16.67%
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52
100.00%
6
100.00%



static inline int pcpu_running(struct pcpu *pcpu)
{
	if (__pcpu_sigp(pcpu->address, SIGP_SENSE_RUNNING,
			0, NULL) != SIGP_CC_STATUS_STORED)
		return 1;
	/* Status stored condition code is equivalent to cpu not running. */
	return 0;
}

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/*
 * Find struct pcpu by cpu address.
 */


static struct pcpu *pcpu_find_address(const struct cpumask *mask, u16 address)
{
	int cpu;

	for_each_cpu(cpu, mask)
		if (pcpu_devices[cpu].address == address)
			return pcpu_devices + cpu;
	return NULL;
}

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3
100.00%



static void pcpu_ec_call(struct pcpu *pcpu, int ec_bit)
{
	int order;

	if (test_and_set_bit(ec_bit, &pcpu->ec_mask))
		return;
	order = pcpu_running(pcpu) ? SIGP_EXTERNAL_CALL : SIGP_EMERGENCY_SIGNAL;
	pcpu->ec_clk = get_tod_clock_fast();
	pcpu_sigp_retry(pcpu, order, 0);
}

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5
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#define ASYNC_FRAME_OFFSET (ASYNC_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE)

#define PANIC_FRAME_OFFSET (PAGE_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE)



static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
{
	unsigned long async_stack, panic_stack;
	unsigned long mcesa_origin, mcesa_bits;
	struct lowcore *lc;

	mcesa_origin = mcesa_bits = 0;
	if (pcpu != &pcpu_devices[0]) {
		pcpu->lowcore =	(struct lowcore *)
			__get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
		async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
		panic_stack = __get_free_page(GFP_KERNEL);
		if (!pcpu->lowcore || !panic_stack || !async_stack)
			goto out;
		if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
			mcesa_origin = (unsigned long)
				kmem_cache_alloc(pcpu_mcesa_cache, GFP_KERNEL);
			if (!mcesa_origin)
				goto out;
			/* The pointer is stored with mcesa_bits ORed in */
			kmemleak_not_leak((void *) mcesa_origin);
			mcesa_bits = MACHINE_HAS_GS ? 11 : 0;
		}
	} else {
		async_stack = pcpu->lowcore->async_stack - ASYNC_FRAME_OFFSET;
		panic_stack = pcpu->lowcore->panic_stack - PANIC_FRAME_OFFSET;
		mcesa_origin = pcpu->lowcore->mcesad & MCESA_ORIGIN_MASK;
		mcesa_bits = pcpu->lowcore->mcesad & MCESA_LC_MASK;
	}
	lc = pcpu->lowcore;
	memcpy(lc, &S390_lowcore, 512);
	memset((char *) lc + 512, 0, sizeof(*lc) - 512);
	lc->async_stack = async_stack + ASYNC_FRAME_OFFSET;
	lc->panic_stack = panic_stack + PANIC_FRAME_OFFSET;
	lc->mcesad = mcesa_origin | mcesa_bits;
	lc->cpu_nr = cpu;
	lc->spinlock_lockval = arch_spin_lockval(cpu);
	if (vdso_alloc_per_cpu(lc))
		goto out;
	lowcore_ptr[cpu] = lc;
	pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, (u32)(unsigned long) lc);
	return 0;
out:
	if (pcpu != &pcpu_devices[0]) {
		if (mcesa_origin)
			kmem_cache_free(pcpu_mcesa_cache,
					(void *) mcesa_origin);
		free_page(panic_stack);
		free_pages(async_stack, ASYNC_ORDER);
		free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
	}
	return -ENOMEM;
}

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84
23.40%
5
50.00%
Christian Bornträger
10
2.79%
1
10.00%
Philipp Hachtmann
9
2.51%
1
10.00%
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359
100.00%
10
100.00%

#ifdef CONFIG_HOTPLUG_CPU



static void pcpu_free_lowcore(struct pcpu *pcpu)
{
	unsigned long mcesa_origin;

	pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, 0);
	lowcore_ptr[pcpu - pcpu_devices] = NULL;
	vdso_free_per_cpu(pcpu->lowcore);
	if (pcpu == &pcpu_devices[0])
		return;
	if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
		mcesa_origin = pcpu->lowcore->mcesad & MCESA_ORIGIN_MASK;
		kmem_cache_free(pcpu_mcesa_cache, (void *) mcesa_origin);
	}
	free_page(pcpu->lowcore->panic_stack-PANIC_FRAME_OFFSET);
	free_pages(pcpu->lowcore->async_stack-ASYNC_FRAME_OFFSET, ASYNC_ORDER);
	free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
}

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10.26%
3
27.27%
Linus Torvalds
4
3.42%
1
9.09%
Andrew Morton
1
0.85%
1
9.09%
Christian Bornträger
1
0.85%
1
9.09%
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117
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11
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#endif /* CONFIG_HOTPLUG_CPU */



static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
{
	struct lowcore *lc = pcpu->lowcore;

	cpumask_set_cpu(cpu, &init_mm.context.cpu_attach_mask);
	cpumask_set_cpu(cpu, mm_cpumask(&init_mm));
	lc->cpu_nr = cpu;
	lc->spinlock_lockval = arch_spin_lockval(cpu);
	lc->percpu_offset = __per_cpu_offset[cpu];
	lc->kernel_asce = S390_lowcore.kernel_asce;
	lc->machine_flags = S390_lowcore.machine_flags;
	lc->user_timer = lc->system_timer = lc->steal_timer = 0;
	__ctl_store(lc->cregs_save_area, 0, 15);
	save_access_regs((unsigned int *) lc->access_regs_save_area);
	memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
	       MAX_FACILITY_BIT/8);
}

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10
7.25%
1
6.67%
Philipp Hachtmann
9
6.52%
1
6.67%
Heiko Carstens
8
5.80%
5
33.33%
Linus Torvalds
4
2.90%
2
13.33%
Peter Zijlstra
3
2.17%
1
6.67%
Total
138
100.00%
15
100.00%



static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk)
{
	struct lowcore *lc = pcpu->lowcore;

	lc->kernel_stack = (unsigned long) task_stack_page(tsk)
		+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
	lc->current_task = (unsigned long) tsk;
	lc->lpp = LPP_MAGIC;
	lc->current_pid = tsk->pid;
	lc->user_timer = tsk->thread.user_timer;
	lc->guest_timer = tsk->thread.guest_timer;
	lc->system_timer = tsk->thread.system_timer;
	lc->hardirq_timer = tsk->thread.hardirq_timer;
	lc->softirq_timer = tsk->thread.softirq_timer;
	lc->steal_timer = 0;
}

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34.38%
2
16.67%
Linus Torvalds
6
4.69%
2
16.67%
Linus Torvalds (pre-git)
2
1.56%
1
8.33%
Andrew Morton
1
0.78%
1
8.33%
Heiko Carstens
1
0.78%
1
8.33%
Total
128
100.00%
12
100.00%



static void pcpu_start_fn(struct pcpu *pcpu, void (*func)(void *), void *data)
{
	struct lowcore *lc = pcpu->lowcore;

	lc->restart_stack = lc->kernel_stack;
	lc->restart_fn = (unsigned long) func;
	lc->restart_data = (unsigned long) data;
	lc->restart_source = -1UL;
	pcpu_sigp_retry(pcpu, SIGP_RESTART, 0);
}

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60.00%
Rusty Russell
2
2.56%
1
20.00%
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78
100.00%
5
100.00%

/*
 * Call function via PSW restart on pcpu and stop the current cpu.
 */


static void pcpu_delegate(struct pcpu *pcpu, void (*func)(void *),
			  void *data, unsigned long stack)
{
	struct lowcore *lc = lowcore_ptr[pcpu - pcpu_devices];
	unsigned long source_cpu = stap();

	__load_psw_mask(PSW_KERNEL_BITS);
	if (pcpu->address == source_cpu)
		func(data);	/* should not return */
	/* Stop target cpu (if func returns this stops the current cpu). */
	pcpu_sigp_retry(pcpu, SIGP_STOP, 0);
	/* Restart func on the target cpu and stop the current cpu. */
	mem_assign_absolute(lc->restart_stack, stack);
	mem_assign_absolute(lc->restart_fn, (unsigned long) func);
	mem_assign_absolute(lc->restart_data, (unsigned long) data);
	mem_assign_absolute(lc->restart_source, source_cpu);
	asm volatile(
                "0:     sigp    0,%0,%2 # sigp restart to target cpu\n"
                "       brc     2,0b    # busy, try again\n"
                "1:     sigp    0,%1,%3 # sigp stop to current cpu\n"
                "       brc     2,1b    # busy, try again\n"
                : : "d" (pcpu->address), "d" (source_cpu),
                    "K" (SIGP_RESTART), "K" (SIGP_STOP)
                : "0", "1", "cc");
	for (;;) ;
}

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31.30%
4
40.00%
Michael Holzheu
17
12.98%
1
10.00%
Linus Torvalds
15
11.45%
1
10.00%
Andrew Morton
3
2.29%
1
10.00%
Linus Torvalds (pre-git)
1
0.76%
1
10.00%
Total
131
100.00%
10
100.00%

/*
 * Enable additional logical cpus for multi-threading.
 */


static int pcpu_set_smt(unsigned int mtid)
{
	int cc;

	if (smp_cpu_mtid == mtid)
		return 0;
	cc = __pcpu_sigp(0, SIGP_SET_MULTI_THREADING, mtid, NULL);
	if (cc == 0) {
		smp_cpu_mtid = mtid;
		smp_cpu_mt_shift = 0;
		while (smp_cpu_mtid >= (1U << smp_cpu_mt_shift))
			smp_cpu_mt_shift++;
		pcpu_devices[0].address = stap();
	}
	return cc;
}

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77
100.00%
2
100.00%

/*
 * Call function on an online CPU.
 */


void smp_call_online_cpu(void (*func)(void *), void *data)
{
	struct pcpu *pcpu;

	/* Use the current cpu if it is online. */
	pcpu = pcpu_find_address(cpu_online_mask, stap());
	if (!pcpu)
		/* Use the first online cpu. */
		pcpu = pcpu_devices + cpumask_first(cpu_online_mask);
	pcpu_delegate(pcpu, func, data, (unsigned long) restart_stack);
}

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6
9.23%
1
20.00%
Linus Torvalds
5
7.69%
1
20.00%
Total
65
100.00%
5
100.00%

/*
 * Call function on the ipl CPU.
 */


void smp_call_ipl_cpu(void (*func)(void *), void *data)
{
	pcpu_delegate(&pcpu_devices[0], func, data,
		      pcpu_devices->lowcore->panic_stack -
		      PANIC_FRAME_OFFSET + PAGE_SIZE);
}

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8
19.05%
1
20.00%
Heiko Carstens
4
9.52%
1
20.00%
Michael Holzheu
2
4.76%
1
20.00%
Total
42
100.00%
5
100.00%



int smp_find_processor_id(u16 address)
{
	int cpu;

	for_each_present_cpu(cpu)
		if (pcpu_devices[cpu].address == address)
			return cpu;
	return -1;
}

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7
21.21%
1
25.00%
Linus Torvalds
1
3.03%
1
25.00%
Total
33
100.00%
4
100.00%



bool arch_vcpu_is_preempted(int cpu)
{
	if (test_cpu_flag_of(CIF_ENABLED_WAIT, cpu))
		return false;
	if (pcpu_running(pcpu_devices + cpu))
		return false;
	return true;
}
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33.33%
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33.33%
Michael Holzheu
2
5.71%
1
33.33%
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35
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3
100.00%


EXPORT_SYMBOL(arch_vcpu_is_preempted);



void smp_yield_cpu(int cpu)
{
	if (MACHINE_HAS_DIAG9C) {
		diag_stat_inc_norecursion(DIAG_STAT_X09C);
		asm volatile("diag %0,0,0x9c"
                             : : "d" (pcpu_devices[cpu].address));
	} else if (MACHINE_HAS_DIAG44) {
		diag_stat_inc_norecursion(DIAG_STAT_X044);
		asm volatile("diag 0,0,0x44");
	}
}

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60.00%
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6
16.22%
2
40.00%
Total
37
100.00%
5
100.00%

/*
 * Send cpus emergency shutdown signal. This gives the cpus the
 * opportunity to complete outstanding interrupts.
 */


static void smp_emergency_stop(cpumask_t *cpumask)
{
	u64 end;
	int cpu;

	end = get_tod_clock() + (1000000UL << 12);
	for_each_cpu(cpu, cpumask) {
		struct pcpu *pcpu = pcpu_devices + cpu;
		set_bit(ec_stop_cpu, &pcpu->ec_mask);
		while (__pcpu_sigp(pcpu->address, SIGP_EMERGENCY_SIGNAL,
				   0, NULL) == SIGP_CC_BUSY &&
		       get_tod_clock() < end)
			cpu_relax();
	}
	while (get_tod_clock() < end) {
		for_each_cpu(cpu, cpumask)
			if (pcpu_stopped(pcpu_devices + cpu))
				cpumask_clear_cpu(cpu, cpumask);
		if (cpumask_empty(cpumask))
			break;
		cpu_relax();
	}
}

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Martin Schwidefsky
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18.18%
1
12.50%
Heiko Carstens
14
11.57%
6
75.00%
Total
121
100.00%
8
100.00%

/*
 * Stop all cpus but the current one.
 */


void smp_send_stop(void)
{
	cpumask_t cpumask;
	int cpu;

	/* Disable all interrupts/machine checks */
	__load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
	trace_hardirqs_off();

	debug_set_critical();
	cpumask_copy(&cpumask, cpu_online_mask);
	cpumask_clear_cpu(smp_processor_id(), &cpumask);

	if (oops_in_progress)
		smp_emergency_stop(&cpumask);

	/* stop all processors */
	for_each_cpu(cpu, &cpumask) {
		struct pcpu *pcpu = pcpu_devices + cpu;
		pcpu_sigp_retry(pcpu, SIGP_STOP, 0);
		while (!pcpu_stopped(pcpu))
			cpu_relax();
	}
}

Contributors
Person
Tokens
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Commits
CommitProp
Martin Schwidefsky
55
59.78%
3
27.27%
Heiko Carstens
26
28.26%
5
45.45%
Linus Torvalds (pre-git)
7
7.61%
1
9.09%
Michael Holzheu
3
3.26%
1
9.09%
Rusty Russell
1
1.09%
1
9.09%
Total
92
100.00%
11
100.00%

/*
 * This is the main routine where commands issued by other
 * cpus are handled.
 */


static void smp_handle_ext_call(void)
{
	unsigned long bits;

	/* handle bit signal external calls */
	bits = xchg(&pcpu_devices[smp_processor_id()].ec_mask, 0);
	if (test_bit(ec_stop_cpu, &bits))
		smp_stop_cpu();
	if (test_bit(ec_schedule, &bits))
		scheduler_ipi();
	if (test_bit(ec_call_function_single, &bits))
		generic_smp_call_function_single_interrupt();
}

Contributors
Person
Tokens
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Martin Schwidefsky
37
54.41%
1
16.67%
Heiko Carstens
31
45.59%
5
83.33%
Total
68
100.00%
6
100.00%



static void do_ext_call_interrupt(struct ext_code ext_code,
				  unsigned int param32, unsigned long param64)
{
	inc_irq_stat(ext_code.code == 0x1202 ? IRQEXT_EXC : IRQEXT_EMS);
	smp_handle_ext_call();
}

Contributors
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Heiko Carstens
34
100.00%
1
100.00%
Total
34
100.00%
1
100.00%



void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
	int cpu;

	for_each_cpu(cpu, mask)
		pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single);
}

Contributors
Person
Tokens
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CommitProp
Martin Schwidefsky
19
65.52%
1
25.00%
Heiko Carstens
10
34.48%
3
75.00%
Total
29
100.00%
4
100.00%



void arch_send_call_function_single_ipi(int cpu)
{
	pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single);
}

Contributors
Person
Tokens
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CommitProp
Martin Schwidefsky
14
82.35%
1
33.33%
Heiko Carstens
3
17.65%
2
66.67%
Total
17
100.00%
3
100.00%

/*
 * this function sends a 'reschedule' IPI to another CPU.
 * it goes straight through and wastes no time serializing
 * anything. Worst case is that we lose a reschedule ...
 */


void smp_send_reschedule(int cpu)
{
	pcpu_ec_call(pcpu_devices + cpu, ec_schedule);
}

Contributors
Person
Tokens
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Martin Schwidefsky
15
88.24%
1
33.33%
Heiko Carstens
2
11.76%
2
66.67%
Total
17
100.00%
3
100.00%

/*
 * parameter area for the set/clear control bit callbacks
 */

struct ec_creg_mask_parms {
	
unsigned long orval;
	
unsigned long andval;
	
int cr;
};

/*
 * callback for setting/clearing control bits
 */


static void smp_ctl_bit_callback(void *info)
{
	struct ec_creg_mask_parms *pp = info;
	unsigned long cregs[16];

	__ctl_store(cregs, 0, 15);
	cregs[pp->cr] = (cregs[pp->cr] & pp->andval) | pp->orval;
	__ctl_load(cregs, 0, 15);
}

Contributors
Person
Tokens
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Martin Schwidefsky
53
80.30%
2
50.00%
Heiko Carstens
13
19.70%
2
50.00%
Total
66
100.00%
4
100.00%

/*
 * Set a bit in a control register of all cpus
 */


void smp_ctl_set_bit(int cr, int bit)
{
	struct ec_creg_mask_parms parms = { 1UL << bit, -1UL, cr };

	on_each_cpu(smp_ctl_bit_callback, &parms, 1);
}
Contributors
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Tokens
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Martin Schwidefsky
34
94.44%
1
50.00%
Heiko Carstens
2
5.56%
1
50.00%
Total
36
100.00%
2
100.00%


EXPORT_SYMBOL(smp_ctl_set_bit);

/*
 * Clear a bit in a control register of all cpus
 */


void smp_ctl_clear_bit(int cr, int bit)
{
	struct ec_creg_mask_parms parms = { 0, ~(1UL << bit), cr };

	on_each_cpu(smp_ctl_bit_callback, &parms, 1);
}
Contributors
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Martin Schwidefsky
36
94.74%
1
50.00%
Heiko Carstens
2
5.26%
1
50.00%
Total
38
100.00%
2
100.00%


EXPORT_SYMBOL(smp_ctl_clear_bit);

#ifdef CONFIG_CRASH_DUMP



int smp_store_status(int cpu)
{
	struct pcpu *pcpu = pcpu_devices + cpu;
	unsigned long pa;

	pa = __pa(&pcpu->lowcore->floating_pt_save_area);
	if (__pcpu_sigp_relax(pcpu->address, SIGP_STORE_STATUS_AT_ADDRESS,
			      pa) != SIGP_CC_ORDER_CODE_ACCEPTED)
		return -EIO;
	if (!MACHINE_HAS_VX && !MACHINE_HAS_GS)
		return 0;
	pa = __pa(pcpu->lowcore->mcesad & MCESA_ORIGIN_MASK);
	if (MACHINE_HAS_GS)
		pa |= pcpu->lowcore->mcesad & MCESA_LC_MASK;
	if (__pcpu_sigp_relax(pcpu->address, SIGP_STORE_ADDITIONAL_STATUS,
			      pa) != SIGP_CC_ORDER_CODE_ACCEPTED)
		return -EIO;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
83
74.11%
5
62.50%
Michael Holzheu
24
21.43%
2
25.00%
Heiko Carstens
5
4.46%
1
12.50%
Total
112
100.00%
8
100.00%

/*
 * Collect CPU state of the previous, crashed system.
 * There are four cases:
 * 1) standard zfcp dump
 *    condition: OLDMEM_BASE == NULL && ipl_info.type == IPL_TYPE_FCP_DUMP
 *    The state for all CPUs except the boot CPU needs to be collected
 *    with sigp stop-and-store-status. The boot CPU state is located in
 *    the absolute lowcore of the memory stored in the HSA. The zcore code
 *    will copy the boot CPU state from the HSA.
 * 2) stand-alone kdump for SCSI (zfcp dump with swapped memory)
 *    condition: OLDMEM_BASE != NULL && ipl_info.type == IPL_TYPE_FCP_DUMP
 *    The state for all CPUs except the boot CPU needs to be collected
 *    with sigp stop-and-store-status. The firmware or the boot-loader
 *    stored the registers of the boot CPU in the absolute lowcore in the
 *    memory of the old system.
 * 3) kdump and the old kernel did not store the CPU state,
 *    or stand-alone kdump for DASD
 *    condition: OLDMEM_BASE != NULL && !is_kdump_kernel()
 *    The state for all CPUs except the boot CPU needs to be collected
 *    with sigp stop-and-store-status. The kexec code or the boot-loader
 *    stored the registers of the boot CPU in the memory of the old system.
 * 4) kdump and the old kernel stored the CPU state
 *    condition: OLDMEM_BASE != NULL && is_kdump_kernel()
 *    This case does not exist for s390 anymore, setup_arch explicitly
 *    deactivates the elfcorehdr= kernel parameter
 */


static __init void smp_save_cpu_vxrs(struct save_area *sa, u16 addr,
				     bool is_boot_cpu, unsigned long page)
{
	__vector128 *vxrs = (__vector128 *) page;

	if (is_boot_cpu)
		vxrs = boot_cpu_vector_save_area;
	else
		__pcpu_sigp_relax(addr, SIGP_STORE_ADDITIONAL_STATUS, page);
	save_area_add_vxrs(sa, vxrs);
}

Contributors
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Martin Schwidefsky
46
80.70%
3
75.00%
Michael Holzheu
11
19.30%
1
25.00%
Total
57
100.00%
4
100.00%



static __init void smp_save_cpu_regs(struct save_area *sa, u16 addr,
				     bool is_boot_cpu, unsigned long page)
{
	void *regs = (void *) page;

	if (is_boot_cpu)
		copy_oldmem_kernel(regs, (void *) __LC_FPREGS_SAVE_AREA, 512);
	else
		__pcpu_sigp_relax(addr, SIGP_STORE_STATUS_AT_ADDRESS, page);
	save_area_add_regs(sa, regs);
}

Contributors
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Martin Schwidefsky
47
71.21%
2
66.67%
Heiko Carstens
19
28.79%
1
33.33%
Total
66
100.00%
3
100.00%



void __init smp_save_dump_cpus(void)
{
	int addr, boot_cpu_addr, max_cpu_addr;
	struct save_area *sa;
	unsigned long page;
	bool is_boot_cpu;

	if (!(OLDMEM_BASE || ipl_info.type == IPL_TYPE_FCP_DUMP))
		/* No previous system present, normal boot. */
		return;
	/* Allocate a page as dumping area for the store status sigps */
	page = memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, 1UL << 31);
	/* Set multi-threading state to the previous system. */
	pcpu_set_smt(sclp.mtid_prev);
	boot_cpu_addr = stap();
	max_cpu_addr = SCLP_MAX_CORES << sclp.mtid_prev;
	for (addr = 0; addr <= max_cpu_addr; addr++) {
		if (__pcpu_sigp_relax(addr, SIGP_SENSE, 0) ==
		    SIGP_CC_NOT_OPERATIONAL)
			continue;
		is_boot_cpu = (addr == boot_cpu_addr);
		/* Allocate save area */
		sa = save_area_alloc(is_boot_cpu);
		if (!sa)
			panic("could not allocate memory for save area\n");
		if (MACHINE_HAS_VX)
			/* Get the vector registers */
			smp_save_cpu_vxrs(sa, addr, is_boot_cpu, page);
		/*
                 * For a zfcp dump OLDMEM_BASE == NULL and the registers
                 * of the boot CPU are stored in the HSA. To retrieve
                 * these registers an SCLP request is required which is
                 * done by drivers/s390/char/zcore.c:init_cpu_info()
                 */
		if (!is_boot_cpu || OLDMEM_BASE)
			/* Get the CPU registers */
			smp_save_cpu_regs(sa, addr, is_boot_cpu, page);
	}
	memblock_free(page, PAGE_SIZE);
	diag308_reset();
	pcpu_set_smt(0);
}
Contributors
Person
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CommitProp
Martin Schwidefsky
120
65.57%
4
50.00%
Michael Holzheu
57
31.15%
2
25.00%
Heiko Carstens
3
1.64%
1
12.50%
David Hildenbrand
3
1.64%
1
12.50%
Total
183
100.00%
8
100.00%

#endif /* CONFIG_CRASH_DUMP */



void smp_cpu_set_polarization(int cpu, int val)
{
	pcpu_devices[cpu].polarization = val;
}

Contributors
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Heiko Carstens
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%



int smp_cpu_get_polarization(int cpu)
{
	return pcpu_devices[cpu].polarization;
}

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Heiko Carstens
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%



static void __ref smp_get_core_info(struct sclp_core_info *info, int early)
{
	static int use_sigp_detection;
	int address;

	if (use_sigp_detection || sclp_get_core_info(info, early)) {
		use_sigp_detection = 1;
		for (address = 0;
		     address < (SCLP_MAX_CORES << smp_cpu_mt_shift);
		     address += (1U << smp_cpu_mt_shift)) {
			if (__pcpu_sigp_relax(address, SIGP_SENSE, 0) ==
			    SIGP_CC_NOT_OPERATIONAL)
				continue;
			info->core[info->configured].core_id =
				address >> smp_cpu_mt_shift;
			info->configured++;
		}
		info->combined = info->configured;
	}
}

Contributors
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CommitProp
Martin Schwidefsky
49
46.67%
4
36.36%
Heiko Carstens
45
42.86%
4
36.36%
Michael Holzheu
9
8.57%
1
9.09%
Oleg Nesterov
1
0.95%
1
9.09%
Linus Torvalds (pre-git)
1
0.95%
1
9.09%
Total
105
100.00%
11
100.00%

static int smp_add_present_cpu(int cpu);



static int __smp_rescan_cpus(struct sclp_core_info *info, int sysfs_add)
{
	struct pcpu *pcpu;
	cpumask_t avail;
	int cpu, nr, i, j;
	u16 address;

	nr = 0;
	cpumask_xor(&avail, cpu_possible_mask, cpu_present_mask);
	cpu = cpumask_first(&avail);
	for (i = 0; (i < info->combined) && (cpu < nr_cpu_ids); i++) {
		if (sclp.has_core_type && info->core[i].type != boot_core_type)
			continue;
		address = info->core[i].core_id << smp_cpu_mt_shift;
		for (j = 0; j <= smp_cpu_mtid; j++) {
			if (pcpu_find_address(cpu_present_mask, address + j))
				continue;
			pcpu = pcpu_devices + cpu;
			pcpu->address = address + j;
			pcpu->state =
				(cpu >= info->configured*(smp_cpu_mtid + 1)) ?
				CPU_STATE_STANDBY : CPU_STATE_CONFIGURED;
			smp_cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
			set_cpu_present(cpu, true);
			if (sysfs_add && smp_add_present_cpu(cpu) != 0)
				set_cpu_present(cpu, false);
			else
				nr++;
			cpu = cpumask_next(cpu, &avail);
			if (cpu >= nr_cpu_ids)
				break;
		}
	}
	return nr;
}

Contributors
Person
Tokens
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Commits
CommitProp
Martin Schwidefsky
188
81.39%
5
38.46%
Heiko Carstens
17
7.36%
5
38.46%
Michael Holzheu
13
5.63%
1
7.69%
Linus Torvalds (pre-git)
12
5.19%
1
7.69%
Oleg Nesterov
1
0.43%
1
7.69%
Total
231
100.00%
13
100.00%



void __init smp_detect_cpus(void)
{
	unsigned int cpu, mtid, c_cpus, s_cpus;
	struct sclp_core_info *info;
	u16 address;

	/* Get CPU information */
	info = memblock_virt_alloc(sizeof(*info), 8);
	smp_get_core_info(info, 1);
	/* Find boot CPU type */
	if (sclp.has_core_type) {
		address = stap();
		for (cpu = 0; cpu < info->combined; cpu++)
			if (info->core[cpu].core_id == address) {
				/* The boot cpu dictates the cpu type. */
				boot_core_type = info->core[cpu].type;
				break;
			}
		if (cpu >= info->combined)
			panic("Could not find boot CPU type");
	}

	/* Set multi-threading state for the current system */
	mtid = boot_core_type ? sclp.mtid : sclp.mtid_cp;
	mtid = (mtid < smp_max_threads) ? mtid : smp_max_threads - 1;
	pcpu_set_smt(mtid);

	/* Print number of CPUs */
	c_cpus = s_cpus = 0;
	for (cpu = 0; cpu < info->combined; cpu++) {
		if (sclp.has_core_type &&
		    info->core[cpu].type != boot_core_type)
			continue;
		if (cpu < info->configured)
			c_cpus += smp_cpu_mtid + 1;
		else
			s_cpus += smp_cpu_mtid + 1;
	}
	pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus);

	/* Add CPUs present at boot */
	get_online_cpus();
	__smp_rescan_cpus(info, 0);
	put_online_cpus();
	memblock_free_early((unsigned long)info, sizeof(*info));
}

Contributors
Person
Tokens
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Commits
CommitProp
Martin Schwidefsky
174
69.60%
3
37.50%
Heiko Carstens
56
22.40%
2
25.00%
Michael Holzheu
11
4.40%
1
12.50%
David Hildenbrand
8
3.20%
1
12.50%
Linus Torvalds (pre-git)
1
0.40%
1
12.50%
Total
250
100.00%
8
100.00%

/*
 *      Activate a secondary processor.
 */


static void smp_start_secondary(void *cpuvoid)
{
	S390_lowcore.last_update_clock = get_tod_clock();
	S390_lowcore.restart_stack = (unsigned long) restart_stack;
	S390_lowcore.restart_fn = (unsigned long) do_restart;
	S390_lowcore.restart_data = 0;
	S390_lowcore.restart_source = -1UL;
	restore_access_regs(S390_lowcore.access_regs_save_area);
	__ctl_load(S390_lowcore.cregs_save_area, 0, 15);
	__load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
	cpu_init();
	preempt_disable();
	init_cpu_timer();
	vtime_init();
	pfault_init();
	notify_cpu_starting(smp_processor_id());
	set_cpu_online(smp_processor_id(), true);
	inc_irq_stat(CPU_RST);
	local_irq_enable();
	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}

Contributors
Person
Tokens
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Commits
CommitProp
Martin Schwidefsky
65
55.56%
4
36.36%
Heiko Carstens
45
38.46%
4
36.36%
Thomas Gleixner
4
3.42%
2
18.18%
Michael Holzheu
3
2.56%
1
9.09%
Total
117
100.00%
11
100.00%

/* Upping and downing of CPUs */


int __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
	struct pcpu *pcpu;
	int base, i, rc;

	pcpu = pcpu_devices + cpu;
	if (pcpu->state != CPU_STATE_CONFIGURED)
		return -EIO;
	base = smp_get_base_cpu(cpu);
	for (i = 0; i <= smp_cpu_mtid; i++) {
		if (base + i < nr_cpu_ids)
			if (cpu_online(base + i))
				break;
	}
	/*
         * If this is the first CPU of the core to get online
         * do an initial CPU reset.
         */
	if (i > smp_cpu_mtid &&
	    pcpu_sigp_retry(pcpu_devices + base, SIGP_INITIAL_CPU_RESET, 0) !=
	    SIGP_CC_ORDER_CODE_ACCEPTED)
		return -EIO;

	rc = pcpu_alloc_lowcore(pcpu, cpu);
	if (rc)
		return rc;
	pcpu_prepare_secondary(pcpu, cpu);
	pcpu_attach_task(pcpu, tidle);
	pcpu_start_fn(pcpu, smp_start_secondary, NULL);
	/* Wait until cpu puts itself in the online & active maps */
	while (!cpu_online(cpu))
		cpu_relax();
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
123
75.93%
4
22.22%
Heiko Carstens
30
18.52%
11
61.11%
Thomas Gleixner
6
3.70%
2
11.11%
Michael Ryan
3
1.85%
1
5.56%
Total
162
100.00%
18
100.00%


static unsigned int setup_possible_cpus __initdata;



static int __init _setup_possible_cpus(char *s)
{
	get_option(&s, &setup_possible_cpus);
	return 0;
}
Contributors
Person
Tokens
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Commits
CommitProp
Heiko Carstens
22
95.65%
6
85.71%
Martin Schwidefsky
1
4.35%
1
14.29%
Total
23
100.00%
7
100.00%

early_param("possible_cpus", _setup_possible_cpus);

#ifdef CONFIG_HOTPLUG_CPU



int __cpu_disable(void)
{
	unsigned long cregs[16];

	/* Handle possible pending IPIs */
	smp_handle_ext_call();
	set_cpu_online(smp_processor_id(), false);
	/* Disable pseudo page faults on this cpu. */
	pfault_fini();
	/* Disable interrupt sources via control register. */
	__ctl_store(cregs, 0, 15);
	cregs[0]  &= ~0x0000ee70UL;	/* disable all external interrupts */
	cregs[6]  &= ~0xff000000UL;	/* disable all I/O interrupts */
	cregs[14] &= ~0x1f000000UL;	/* disable most machine checks */
	__ctl_load(cregs, 0, 15);
	clear_cpu_flag(CIF_NOHZ_DELAY);
	return 0;
}

Contributors
Person
Tokens
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Commits
CommitProp
Martin Schwidefsky
66
78.57%
6
50.00%
Heiko Carstens
8
9.52%
3
25.00%
Zwane Mwaikambo
5
5.95%
1
8.33%
Linus Torvalds (pre-git)
3
3.57%
1
8.33%
Motohiro Kosaki
2
2.38%
1
8.33%
Total
84
100.00%
12
100.00%



void __cpu_die(unsigned int cpu)
{
	struct pcpu *pcpu;

	/* Wait until target cpu is down */
	pcpu = pcpu_devices + cpu;
	while (!pcpu_stopped(pcpu))
		cpu_relax();
	pcpu_free_lowcore(pcpu);
	cpumask_clear_cpu(cpu, mm_cpumask(&init_mm));
	cpumask_clear_cpu(cpu, &init_mm.context.cpu_attach_mask);
}

Contributors
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Martin Schwidefsky
51
85.00%
4
50.00%
Heiko Carstens
7
11.67%
3
37.50%
Linus Torvalds (pre-git)
2
3.33%
1
12.50%
Total
60
100.00%
8
100.00%



void __noreturn cpu_die(void)
{
	idle_task_exit();
	pcpu_sigp_retry(pcpu_devices + smp_processor_id(), SIGP_STOP, 0);
	for (;;) ;
}

Contributors
Person
Tokens
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CommitProp
Martin Schwidefsky
22
75.86%
2
28.57%
Heiko Carstens
6
20.69%
4
57.14%
Linus Torvalds (pre-git)
1
3.45%
1
14.29%
Total
29
100.00%
7
100.00%

#endif /* CONFIG_HOTPLUG_CPU */



void __init smp_fill_possible_mask(void)
{
	unsigned int possible, sclp_max, cpu;

	sclp_max = max(sclp.mtid, sclp.mtid_cp) + 1;
	sclp_max = min(smp_max_threads, sclp_max);
	sclp_max = (sclp.max_cores * sclp_max) ?: nr_cpu_ids;
	possible = setup_possible_cpus ?: nr_cpu_ids;
	possible = min(possible, sclp_max);
	for (cpu = 0; cpu < possible && cpu < nr_cpu_ids; cpu++)
		set_cpu_possible(cpu, true);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
59
63.44%
2
25.00%
David Hildenbrand
23
24.73%
3
37.50%
Martin Schwidefsky
9
9.68%
2
25.00%
Dan Carpenter
2
2.15%
1
12.50%
Total
93
100.00%
8
100.00%



void __init smp_prepare_cpus(unsigned int max_cpus)
{
	unsigned long size;

	/* request the 0x1201 emergency signal external interrupt */
	if (register_external_irq(EXT_IRQ_EMERGENCY_SIG, do_ext_call_interrupt))
		panic("Couldn't request external interrupt 0x1201");
	/* request the 0x1202 external call external interrupt */
	if (register_external_irq(EXT_IRQ_EXTERNAL_CALL, do_ext_call_interrupt))
		panic("Couldn't request external interrupt 0x1202");
	/* create slab cache for the machine-check-extended-save-areas */
	if (MACHINE_HAS_VX || MACHINE_HAS_GS) {
		size = 1UL << (MACHINE_HAS_GS ? 11 : 10);
		pcpu_mcesa_cache = kmem_cache_create("nmi_save_areas",
						     size, size, 0, NULL);
		if (!pcpu_mcesa_cache)
			panic("Couldn't create nmi save area cache");
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
64
71.11%
5
45.45%
Heiko Carstens
12
13.33%
3
27.27%
Linus Torvalds
6
6.67%
1
9.09%
Thomas Huth
4
4.44%
1
9.09%
Linus Torvalds (pre-git)
4
4.44%
1
9.09%
Total
90
100.00%
11
100.00%



void __init smp_prepare_boot_cpu(void)
{
	struct pcpu *pcpu = pcpu_devices;

	WARN_ON(!cpu_present(0) || !cpu_online(0));
	pcpu->state = CPU_STATE_CONFIGURED;
	pcpu->lowcore = (struct lowcore *)(unsigned long) store_prefix();
	S390_lowcore.percpu_offset = __per_cpu_offset[0];
	smp_cpu_set_polarization(0, POLARIZATION_UNKNOWN);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
32
47.06%
4
30.77%
Heiko Carstens
29
42.65%
7
53.85%
Andrew Morton
6
8.82%
1
7.69%
Linus Torvalds (pre-git)
1
1.47%
1
7.69%
Total
68
100.00%
13
100.00%



void __init smp_cpus_done(unsigned int max_cpus)
{
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
9
100.00%
1
100.00%
Total
9
100.00%
1
100.00%



void __init smp_setup_processor_id(void)
{
	pcpu_devices[0].address = stap();
	S390_lowcore.cpu_nr = 0;
	S390_lowcore.spinlock_lockval = arch_spin_lockval(0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
24
72.73%
2
66.67%
Philipp Hachtmann
9
27.27%
1
33.33%
Total
33
100.00%
3
100.00%

/*
 * the frequency of the profiling timer can be changed
 * by writing a multiplier value into /proc/profile.
 *
 * usually you want to run this on all CPUs ;)
 */


int setup_profiling_timer(unsigned int multiplier)
{
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
12
100.00%
1
100.00%
Total
12
100.00%
1
100.00%

#ifdef CONFIG_HOTPLUG_CPU


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

	mutex_lock(&smp_cpu_state_mutex);
	count = sprintf(buf, "%d\n", pcpu_devices[dev->id].state);
	mutex_unlock(&smp_cpu_state_mutex);
	return count;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
47
83.93%
1
25.00%
Andi Kleen
4
7.14%
1
25.00%
Martin Schwidefsky
3
5.36%
1
25.00%
Kay Sievers
2
3.57%
1
25.00%
Total
56
100.00%
4
100.00%



static ssize_t cpu_configure_store(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	struct pcpu *pcpu;
	int cpu, val, rc, i;
	char delim;

	if (sscanf(buf, "%d %c", &val, &delim) != 1)
		return -EINVAL;
	if (val != 0 && val != 1)
		return -EINVAL;
	get_online_cpus();
	mutex_lock(&smp_cpu_state_mutex);
	rc = -EBUSY;
	/* disallow configuration changes of online cpus and cpu 0 */
	cpu = dev->id;
	cpu = smp_get_base_cpu(cpu);
	if (cpu == 0)
		goto out;
	for (i = 0; i <= smp_cpu_mtid; i++)
		if (cpu_online(cpu + i))
			goto out;
	pcpu = pcpu_devices + cpu;
	rc = 0;
	switch (val) {
	case 0:
		if (pcpu->state != CPU_STATE_CONFIGURED)
			break;
		rc = sclp_core_deconfigure(pcpu->address >> smp_cpu_mt_shift);
		if (rc)
			break;
		for (i = 0; i <= smp_cpu_mtid; i++) {
			if (cpu + i >= nr_cpu_ids || !cpu_present(cpu + i))
				continue;
			pcpu[i].state = CPU_STATE_STANDBY;
			smp_cpu_set_polarization(cpu + i,
						 POLARIZATION_UNKNOWN);
		}
		topology_expect_change();
		break;
	case 1:
		if (pcpu->state != CPU_STATE_STANDBY)
			break;
		rc = sclp_core_configure(pcpu->address >> smp_cpu_mt_shift);
		if (rc)
			break;
		for (i = 0; i <= smp_cpu_mtid; i++) {
			if (cpu + i >= nr_cpu_ids || !cpu_present(cpu + i))
				continue;
			pcpu[i].state = CPU_STATE_CONFIGURED;
			smp_cpu_set_polarization(cpu + i,
						 POLARIZATION_UNKNOWN);
		}
		topology_expect_change();
		break;
	default:
		break;
	}
out:
	mutex_unlock(&smp_cpu_state_mutex);
	put_online_cpus();
	return rc ? rc : count;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
178
52.66%
9
52.94%
Martin Schwidefsky
153
45.27%
5
29.41%
Andi Kleen
4
1.18%
1
5.88%
Kay Sievers
2
0.59%
1
5.88%
Andrew Morton
1
0.30%
1
5.88%
Total
338
100.00%
17
100.00%

static DEVICE_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
#endif /* CONFIG_HOTPLUG_CPU */



static ssize_t show_cpu_address(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", pcpu_devices[dev->id].address);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
25
67.57%
2
33.33%
Andi Kleen
4
10.81%
1
16.67%
Martin Schwidefsky
3
8.11%
1
16.67%
Linus Torvalds (pre-git)
3
8.11%
1
16.67%
Kay Sievers
2
5.41%
1
16.67%
Total
37
100.00%
6
100.00%

static DEVICE_ATTR(address, 0444, show_cpu_address, NULL);


static struct attribute *cpu_common_attrs[] = {
#ifdef CONFIG_HOTPLUG_CPU
	&dev_attr_configure.attr,
#endif
	&dev_attr_address.attr,
	NULL,
};


static struct attribute_group cpu_common_attr_group = {
	.attrs = cpu_common_attrs,
};


static struct attribute *cpu_online_attrs[] = {
	&dev_attr_idle_count.attr,
	&dev_attr_idle_time_us.attr,
	NULL,
};


static struct attribute_group cpu_online_attr_group = {
	.attrs = cpu_online_attrs,
};



static int smp_cpu_online(unsigned int cpu)
{
	struct device *s = &per_cpu(cpu_device, cpu)->dev;

	return sysfs_create_group(&s->kobj, &cpu_online_attr_group);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
29
78.38%
3
60.00%
Sebastian Andrzej Siewior
6
16.22%
1
20.00%
Kay Sievers
2
5.41%
1
20.00%
Total
37
100.00%
5
100.00%



static int smp_cpu_pre_down(unsigned int cpu)
{
	struct device *s = &per_cpu(cpu_device, cpu)->dev;

	sysfs_remove_group(&s->kobj, &cpu_online_attr_group);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sebastian Andrzej Siewior
25
64.10%
1
50.00%
Heiko Carstens
14
35.90%
1
50.00%
Total
39
100.00%
2
100.00%



static int smp_add_present_cpu(int cpu)
{
	struct device *s;
	struct cpu *c;
	int rc;

	c = kzalloc(sizeof(*c), GFP_KERNEL);
	if (!c)
		return -ENOMEM;
	per_cpu(cpu_device, cpu) = c;
	s = &c->dev;
	c->hotpluggable = 1;
	rc = register_cpu(c, cpu);
	if (rc)
		goto out;
	rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group);
	if (rc)
		goto out_cpu;
	rc = topology_cpu_init(c);
	if (rc)
		goto out_topology;
	return 0;

out_topology:
	sysfs_remove_group(&s->kobj, &cpu_common_attr_group);
out_cpu:
#ifdef CONFIG_HOTPLUG_CPU
	unregister_cpu(c);
#endif
out:
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
148
99.33%
6
85.71%
Kay Sievers
1
0.67%
1
14.29%
Total
149
100.00%
7
100.00%

#ifdef CONFIG_HOTPLUG_CPU



int __ref smp_rescan_cpus(void)
{
	struct sclp_core_info *info;
	int nr;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	smp_get_core_info(info, 0);
	get_online_cpus();
	mutex_lock(&smp_cpu_state_mutex);
	nr = __smp_rescan_cpus(info, 1);
	mutex_unlock(&smp_cpu_state_mutex);
	put_online_cpus();
	kfree(info);
	if (nr)
		topology_schedule_update();
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
51
58.62%
9
69.23%
Martin Schwidefsky
28
32.18%
2
15.38%
Andrew Morton
7
8.05%
1
7.69%
Motohiro Kosaki
1
1.15%
1
7.69%
Total
87
100.00%
13
100.00%



static ssize_t __ref rescan_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf,
				  size_t count)
{
	int rc;

	rc = smp_rescan_cpus();
	return rc ? rc : count;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
31
77.50%
2
40.00%
Andi Kleen
6
15.00%
2
40.00%
Kay Sievers
3
7.50%
1
20.00%
Total
40
100.00%
5
100.00%

static DEVICE_ATTR(rescan, 0200, NULL, rescan_store);
#endif /* CONFIG_HOTPLUG_CPU */



static int __init s390_smp_init(void)
{
	int cpu, rc = 0;

#ifdef CONFIG_HOTPLUG_CPU
	rc = device_create_file(cpu_subsys.dev_root, &dev_attr_rescan);
	if (rc)
		return rc;
#endif
	for_each_present_cpu(cpu) {
		rc = smp_add_present_cpu(cpu);
		if (rc)
			goto out;
	}

	rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "s390/smp:online",
			       smp_cpu_online, smp_cpu_pre_down);
	rc = rc <= 0 ? rc : 0;
out:
	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Heiko Carstens
55
62.50%
6
60.00%
Srivatsa S. Bhat
13
14.77%
1
10.00%
Sebastian Andrzej Siewior
9
10.23%
1
10.00%
Andrew Morton
6
6.82%
1
10.00%
Kay Sievers
5
5.68%
1
10.00%
Total
88
100.00%
10
100.00%


subsys_initcall(s390_smp_init);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Schwidefsky
2973
56.29%
32
20.38%
Heiko Carstens
1624
30.75%
71
45.22%
Michael Holzheu
221
4.18%
12
7.64%
Linus Torvalds (pre-git)
89
1.68%
1
0.64%
Christian Bornträger
87
1.65%
5
3.18%
Linus Torvalds
43
0.81%
3
1.91%
Andrew Morton
40
0.76%
5
3.18%
Sebastian Andrzej Siewior
40
0.76%
1
0.64%
David Hildenbrand
34
0.64%
3
1.91%
Philipp Hachtmann
27
0.51%
1
0.64%
Kay Sievers
24
0.45%
1
0.64%
Andi Kleen
18
0.34%
2
1.27%
Srivatsa S. Bhat
13
0.25%
1
0.64%
Thomas Gleixner
10
0.19%
4
2.55%
Ingo Molnar
6
0.11%
2
1.27%
Zwane Mwaikambo
5
0.09%
1
0.64%
Thomas Huth
4
0.08%
1
0.64%
Motohiro Kosaki
3
0.06%
1
0.64%
Alexey Dobriyan
3
0.06%
1
0.64%
Rusty Russell
3
0.06%
2
1.27%
Michael Ryan
3
0.06%
1
0.64%
Tejun Heo
3
0.06%
1
0.64%
Peter Zijlstra
3
0.06%
1
0.64%
Oleg Nesterov
2
0.04%
1
0.64%
Dan Carpenter
2
0.04%
1
0.64%
Greg Kroah-Hartman
1
0.02%
1
0.64%
Paul Gortmaker
1
0.02%
1
0.64%
Total
5282
100.00%
157
100.00%
Directory: arch/s390/kernel

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