/*
- * arch/s390/kernel/smp.c
+ * SMP related functions
*
- * Copyright IBM Corp. 1999, 2009
- * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
- * Martin Schwidefsky (schwidefsky@de.ibm.com)
- * Heiko Carstens (heiko.carstens@de.ibm.com)
+ * 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
*
- * We work with logical cpu numbering everywhere we can. The only
- * functions using the real cpu address (got from STAP) are the sigp
- * functions. For all other functions we use the identity mapping.
- * That means that cpu_number_map[i] == i for every cpu. cpu_number_map is
- * used e.g. to find the idle task belonging to a logical cpu. Every array
- * in the kernel is sorted by the logical cpu number and not by the physical
- * one which is causing all the confusion with __cpu_logical_map and
- * cpu_number_map in other architectures.
+ * 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"
#include <linux/spinlock.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
- #include <linux/cache.h>
#include <linux/interrupt.h>
#include <linux/irqflags.h>
#include <linux/cpu.h>
- #include <linux/timex.h>
- #include <linux/bootmem.h>
#include <linux/slab.h>
#include <linux/crash_dump.h>
#include <asm/asm-offsets.h>
#include <asm/ipl.h>
#include <asm/setup.h>
- #include <asm/sigp.h>
- #include <asm/pgalloc.h>
#include <asm/irq.h>
- #include <asm/cpcmd.h>
#include <asm/tlbflush.h>
#include <asm/timer.h>
#include <asm/lowcore.h>
#include <asm/sclp.h>
- #include <asm/cputime.h>
#include <asm/vdso.h>
- #include <asm/cpu.h>
+ #include <asm/debug.h>
+ #include <asm/os_info.h>
#include "entry.h"
- /* logical cpu to cpu address */
- unsigned short __cpu_logical_map[NR_CPUS];
+ enum {
+ sigp_sense = 1,
+ sigp_external_call = 2,
+ sigp_emergency_signal = 3,
+ sigp_start = 4,
+ sigp_stop = 5,
+ sigp_restart = 6,
+ sigp_stop_and_store_status = 9,
+ sigp_initial_cpu_reset = 11,
+ sigp_cpu_reset = 12,
+ sigp_set_prefix = 13,
+ sigp_store_status_at_address = 14,
+ sigp_store_extended_status_at_address = 15,
+ sigp_set_architecture = 18,
+ sigp_conditional_emergency_signal = 19,
+ sigp_sense_running = 21,
+ };
- static struct task_struct *current_set[NR_CPUS];
+ enum {
+ sigp_order_code_accepted = 0,
+ sigp_status_stored = 1,
+ sigp_busy = 2,
+ sigp_not_operational = 3,
+ };
- static u8 smp_cpu_type;
- static int smp_use_sigp_detection;
+ enum {
+ ec_schedule = 0,
+ ec_call_function,
+ ec_call_function_single,
+ ec_stop_cpu,
+ };
- enum s390_cpu_state {
+ enum {
CPU_STATE_STANDBY,
CPU_STATE_CONFIGURED,
};
+ struct pcpu {
+ struct cpu cpu;
+ struct task_struct *idle; /* idle process for the cpu */
+ struct _lowcore *lowcore; /* lowcore page(s) for the cpu */
+ unsigned long async_stack; /* async stack for the cpu */
+ unsigned long panic_stack; /* panic stack for the cpu */
+ unsigned long ec_mask; /* bit mask for ec_xxx functions */
+ int state; /* physical cpu state */
+ u32 status; /* last status received via sigp */
+ u16 address; /* physical cpu address */
+ };
+
+ static u8 boot_cpu_type;
+ static u16 boot_cpu_address;
+ static struct pcpu pcpu_devices[NR_CPUS];
+
DEFINE_MUTEX(smp_cpu_state_mutex);
- static int smp_cpu_state[NR_CPUS];
- static DEFINE_PER_CPU(struct cpu, cpu_devices);
+ /*
+ * Signal processor helper functions.
+ */
+ static inline int __pcpu_sigp(u16 addr, u8 order, u32 parm, u32 *status)
+ {
+ register unsigned int reg1 asm ("1") = parm;
+ int cc;
- static void smp_ext_bitcall(int, int);
+ asm volatile(
+ " sigp %1,%2,0(%3)\n"
+ " ipm %0\n"
+ " srl %0,28\n"
+ : "=d" (cc), "+d" (reg1) : "d" (addr), "a" (order) : "cc");
+ if (status && cc == 1)
+ *status = reg1;
+ return cc;
+ }
- static int raw_cpu_stopped(int cpu)
+ static inline int __pcpu_sigp_relax(u16 addr, u8 order, u32 parm, u32 *status)
{
- u32 status;
+ int cc;
- switch (raw_sigp_ps(&status, 0, cpu, sigp_sense)) {
- case sigp_status_stored:
- /* Check for stopped and check stop state */
- if (status & 0x50)
- return 1;
- break;
- default:
- break;
+ while (1) {
+ cc = __pcpu_sigp(addr, order, parm, status);
+ if (cc != sigp_busy)
+ return cc;
+ cpu_relax();
}
- return 0;
}
- static inline int cpu_stopped(int cpu)
+ 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, &pcpu->status);
+ if (cc != sigp_busy)
+ break;
+ if (retry >= 3)
+ udelay(10);
+ }
+ return cc;
+ }
+
+ static inline int pcpu_stopped(struct pcpu *pcpu)
+ {
+ if (__pcpu_sigp(pcpu->address, sigp_sense,
+ 0, &pcpu->status) != sigp_status_stored)
+ return 0;
+ /* Check for stopped and check stop state */
+ return !!(pcpu->status & 0x50);
+ }
+
+ static inline int pcpu_running(struct pcpu *pcpu)
{
- return raw_cpu_stopped(cpu_logical_map(cpu));
+ if (__pcpu_sigp(pcpu->address, sigp_sense_running,
+ 0, &pcpu->status) != sigp_status_stored)
+ return 1;
+ /* Check for running status */
+ return !(pcpu->status & 0x400);
}
/*
- * Ensure that PSW restart is done on an online CPU
+ * Find struct pcpu by cpu address.
*/
- void smp_restart_with_online_cpu(void)
+ static struct pcpu *pcpu_find_address(const struct cpumask *mask, int address)
{
int cpu;
- for_each_online_cpu(cpu) {
- if (stap() == __cpu_logical_map[cpu]) {
- /* We are online: Enable DAT again and return */
- __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT);
- return;
- }
+ for_each_cpu(cpu, mask)
+ if (pcpu_devices[cpu].address == address)
+ return pcpu_devices + cpu;
+ return NULL;
+ }
+
+ static void pcpu_ec_call(struct pcpu *pcpu, int ec_bit)
+ {
+ int order;
+
+ set_bit(ec_bit, &pcpu->ec_mask);
+ order = pcpu_running(pcpu) ?
+ sigp_external_call : sigp_emergency_signal;
+ pcpu_sigp_retry(pcpu, order, 0);
+ }
+
+ static int __cpuinit pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
+ {
+ struct _lowcore *lc;
+
+ if (pcpu != &pcpu_devices[0]) {
+ pcpu->lowcore = (struct _lowcore *)
+ __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
+ pcpu->async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
+ pcpu->panic_stack = __get_free_page(GFP_KERNEL);
+ if (!pcpu->lowcore || !pcpu->panic_stack || !pcpu->async_stack)
+ goto out;
}
- /* We are not online: Do PSW restart on an online CPU */
- while (sigp(cpu, sigp_restart) == sigp_busy)
- cpu_relax();
- /* And stop ourself */
- while (raw_sigp(stap(), sigp_stop) == sigp_busy)
- cpu_relax();
- for (;;);
+ lc = pcpu->lowcore;
+ memcpy(lc, &S390_lowcore, 512);
+ memset((char *) lc + 512, 0, sizeof(*lc) - 512);
+ lc->async_stack = pcpu->async_stack + ASYNC_SIZE;
+ lc->panic_stack = pcpu->panic_stack + PAGE_SIZE;
+ lc->cpu_nr = cpu;
+ #ifndef CONFIG_64BIT
+ if (MACHINE_HAS_IEEE) {
+ lc->extended_save_area_addr = get_zeroed_page(GFP_KERNEL);
+ if (!lc->extended_save_area_addr)
+ goto out;
+ }
+ #else
+ if (vdso_alloc_per_cpu(lc))
+ goto out;
+ #endif
+ lowcore_ptr[cpu] = lc;
+ pcpu_sigp_retry(pcpu, sigp_set_prefix, (u32)(unsigned long) lc);
+ return 0;
+ out:
+ if (pcpu != &pcpu_devices[0]) {
+ free_page(pcpu->panic_stack);
+ free_pages(pcpu->async_stack, ASYNC_ORDER);
+ free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
+ }
+ return -ENOMEM;
}
- void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
+ static void pcpu_free_lowcore(struct pcpu *pcpu)
{
- struct _lowcore *lc, *current_lc;
- struct stack_frame *sf;
- struct pt_regs *regs;
- unsigned long sp;
-
- if (smp_processor_id() == 0)
- func(data);
- __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE |
- PSW_MASK_EA | PSW_MASK_BA);
- /* Disable lowcore protection */
- __ctl_clear_bit(0, 28);
- current_lc = lowcore_ptr[smp_processor_id()];
- lc = lowcore_ptr[0];
- if (!lc)
- lc = current_lc;
- lc->restart_psw.mask =
- PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
- lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu;
- if (!cpu_online(0))
- smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]);
- while (sigp(0, sigp_stop_and_store_status) == sigp_busy)
- cpu_relax();
- sp = lc->panic_stack;
- sp -= sizeof(struct pt_regs);
- regs = (struct pt_regs *) sp;
- memcpy(®s->gprs, ¤t_lc->gpregs_save_area, sizeof(regs->gprs));
- regs->psw = current_lc->psw_save_area;
- sp -= STACK_FRAME_OVERHEAD;
- sf = (struct stack_frame *) sp;
- sf->back_chain = 0;
- smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]);
+ pcpu_sigp_retry(pcpu, sigp_set_prefix, 0);
+ lowcore_ptr[pcpu - pcpu_devices] = NULL;
+ #ifndef CONFIG_64BIT
+ if (MACHINE_HAS_IEEE) {
+ struct _lowcore *lc = pcpu->lowcore;
+
+ free_page((unsigned long) lc->extended_save_area_addr);
+ lc->extended_save_area_addr = 0;
+ }
+ #else
+ vdso_free_per_cpu(pcpu->lowcore);
+ #endif
+ if (pcpu != &pcpu_devices[0]) {
+ free_page(pcpu->panic_stack);
+ free_pages(pcpu->async_stack, ASYNC_ORDER);
+ free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
+ }
+ }
+
+ static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
+ {
+ struct _lowcore *lc = pcpu->lowcore;
+
+ atomic_inc(&init_mm.context.attach_count);
+ lc->cpu_nr = cpu;
+ lc->percpu_offset = __per_cpu_offset[cpu];
+ lc->kernel_asce = S390_lowcore.kernel_asce;
+ lc->machine_flags = S390_lowcore.machine_flags;
+ lc->ftrace_func = S390_lowcore.ftrace_func;
+ 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);
+ }
+
+ static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk)
+ {
+ struct _lowcore *lc = pcpu->lowcore;
+ struct thread_info *ti = task_thread_info(tsk);
+
+ lc->kernel_stack = (unsigned long) task_stack_page(tsk) + THREAD_SIZE;
+ lc->thread_info = (unsigned long) task_thread_info(tsk);
+ lc->current_task = (unsigned long) tsk;
+ lc->user_timer = ti->user_timer;
+ lc->system_timer = ti->system_timer;
+ lc->steal_timer = 0;
+ }
+
+ 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);
+ }
+
+ /*
+ * 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 = pcpu->lowcore;
+ unsigned short this_cpu;
+
+ __load_psw_mask(psw_kernel_bits);
+ this_cpu = stap();
+ if (pcpu->address == this_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. */
+ lc->restart_stack = stack;
+ lc->restart_fn = (unsigned long) func;
+ lc->restart_data = (unsigned long) data;
+ lc->restart_source = (unsigned long) this_cpu;
+ asm volatile(
+ "0: sigp 0,%0,6 # sigp restart to target cpu\n"
+ " brc 2,0b # busy, try again\n"
+ "1: sigp 0,%1,5 # sigp stop to current cpu\n"
+ " brc 2,1b # busy, try again\n"
+ : : "d" (pcpu->address), "d" (this_cpu) : "0", "1", "cc");
+ for (;;) ;
+ }
+
+ /*
+ * 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);
+ }
+
+ /*
+ * 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->panic_stack + PAGE_SIZE);
+ }
+
+ int smp_find_processor_id(u16 address)
+ {
+ int cpu;
+
+ for_each_present_cpu(cpu)
+ if (pcpu_devices[cpu].address == address)
+ return cpu;
+ return -1;
+ }
+
+ int smp_vcpu_scheduled(int cpu)
+ {
+ return pcpu_running(pcpu_devices + cpu);
+ }
+
+ void smp_yield(void)
+ {
+ if (MACHINE_HAS_DIAG44)
+ asm volatile("diag 0,0,0x44");
}
- static void smp_stop_cpu(void)
+ void smp_yield_cpu(int cpu)
{
- while (sigp(smp_processor_id(), sigp_stop) == sigp_busy)
+ if (MACHINE_HAS_DIAG9C)
+ asm volatile("diag %0,0,0x9c"
+ : : "d" (pcpu_devices[cpu].address));
+ else if (MACHINE_HAS_DIAG44)
+ asm volatile("diag 0,0,0x44");
+ }
+
+ /*
+ * Send cpus emergency shutdown signal. This gives the cpus the
+ * opportunity to complete outstanding interrupts.
+ */
+ void smp_emergency_stop(cpumask_t *cpumask)
+ {
+ u64 end;
+ int cpu;
+
+ end = get_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_busy &&
+ get_clock() < end)
+ cpu_relax();
+ }
+ while (get_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();
+ }
}
+ /*
+ * Stop all cpus but the current one.
+ */
void smp_send_stop(void)
{
cpumask_t cpumask;
int cpu;
- u64 end;
/* 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) {
- /*
- * Give the other cpus the opportunity to complete
- * outstanding interrupts before stopping them.
- */
- end = get_clock() + (1000000UL << 12);
- for_each_cpu(cpu, &cpumask) {
- set_bit(ec_stop_cpu, (unsigned long *)
- &lowcore_ptr[cpu]->ext_call_fast);
- while (sigp(cpu, sigp_emergency_signal) == sigp_busy &&
- get_clock() < end)
- cpu_relax();
- }
- while (get_clock() < end) {
- for_each_cpu(cpu, &cpumask)
- if (cpu_stopped(cpu))
- cpumask_clear_cpu(cpu, &cpumask);
- if (cpumask_empty(&cpumask))
- break;
- cpu_relax();
- }
- }
+ if (oops_in_progress)
+ smp_emergency_stop(&cpumask);
/* stop all processors */
for_each_cpu(cpu, &cpumask) {
- while (sigp(cpu, sigp_stop) == sigp_busy)
- cpu_relax();
- while (!cpu_stopped(cpu))
+ struct pcpu *pcpu = pcpu_devices + cpu;
+ pcpu_sigp_retry(pcpu, sigp_stop, 0);
+ while (!pcpu_stopped(pcpu))
cpu_relax();
}
}
+ /*
+ * Stop the current cpu.
+ */
+ void smp_stop_cpu(void)
+ {
+ pcpu_sigp_retry(pcpu_devices + smp_processor_id(), sigp_stop, 0);
+ for (;;) ;
+ }
+
/*
* This is the main routine where commands issued by other
* cpus are handled.
*/
-
- static void do_ext_call_interrupt(unsigned int ext_int_code,
+ static void do_ext_call_interrupt(struct ext_code ext_code,
unsigned int param32, unsigned long param64)
{
unsigned long bits;
+ int cpu;
- if ((ext_int_code & 0xffff) == 0x1202)
- kstat_cpu(smp_processor_id()).irqs[EXTINT_EXC]++;
+ cpu = smp_processor_id();
+ if (ext_code.code == 0x1202)
+ kstat_cpu(cpu).irqs[EXTINT_EXC]++;
else
- kstat_cpu(smp_processor_id()).irqs[EXTINT_EMS]++;
+ kstat_cpu(cpu).irqs[EXTINT_EMS]++;
/*
* handle bit signal external calls
*/
- bits = xchg(&S390_lowcore.ext_call_fast, 0);
+ bits = xchg(&pcpu_devices[cpu].ec_mask, 0);
if (test_bit(ec_stop_cpu, &bits))
smp_stop_cpu();
}
- /*
- * Send an external call sigp to another cpu and return without waiting
- * for its completion.
- */
- static void smp_ext_bitcall(int cpu, int sig)
- {
- int order;
-
- /*
- * Set signaling bit in lowcore of target cpu and kick it
- */
- set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);
- while (1) {
- order = smp_vcpu_scheduled(cpu) ?
- sigp_external_call : sigp_emergency_signal;
- if (sigp(cpu, order) != sigp_busy)
- break;
- udelay(10);
- }
- }
-
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
int cpu;
for_each_cpu(cpu, mask)
- smp_ext_bitcall(cpu, ec_call_function);
+ pcpu_ec_call(pcpu_devices + cpu, ec_call_function);
}
void arch_send_call_function_single_ipi(int cpu)
{
- smp_ext_bitcall(cpu, ec_call_function_single);
+ pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single);
}
#ifndef CONFIG_64BIT
*/
void smp_send_reschedule(int cpu)
{
- smp_ext_bitcall(cpu, ec_schedule);
+ pcpu_ec_call(pcpu_devices + cpu, ec_schedule);
}
/*
* parameter area for the set/clear control bit callbacks
*/
struct ec_creg_mask_parms {
- unsigned long orvals[16];
- unsigned long andvals[16];
+ unsigned long orval;
+ unsigned long andval;
+ int cr;
};
/*
{
struct ec_creg_mask_parms *pp = info;
unsigned long cregs[16];
- int i;
__ctl_store(cregs, 0, 15);
- for (i = 0; i <= 15; i++)
- cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i];
+ cregs[pp->cr] = (cregs[pp->cr] & pp->andval) | pp->orval;
__ctl_load(cregs, 0, 15);
}
*/
void smp_ctl_set_bit(int cr, int bit)
{
- struct ec_creg_mask_parms parms;
+ struct ec_creg_mask_parms parms = { 1UL << bit, -1UL, cr };
- memset(&parms.orvals, 0, sizeof(parms.orvals));
- memset(&parms.andvals, 0xff, sizeof(parms.andvals));
- parms.orvals[cr] = 1UL << bit;
on_each_cpu(smp_ctl_bit_callback, &parms, 1);
}
EXPORT_SYMBOL(smp_ctl_set_bit);
*/
void smp_ctl_clear_bit(int cr, int bit)
{
- struct ec_creg_mask_parms parms;
+ struct ec_creg_mask_parms parms = { 0, ~(1UL << bit), cr };
- memset(&parms.orvals, 0, sizeof(parms.orvals));
- memset(&parms.andvals, 0xff, sizeof(parms.andvals));
- parms.andvals[cr] = ~(1UL << bit);
on_each_cpu(smp_ctl_bit_callback, &parms, 1);
}
EXPORT_SYMBOL(smp_ctl_clear_bit);
#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP)
- static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
+ struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
+ EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
+
+ static void __init smp_get_save_area(int cpu, u16 address)
{
- if (ipl_info.type != IPL_TYPE_FCP_DUMP && !OLDMEM_BASE)
- return;
+ void *lc = pcpu_devices[0].lowcore;
+ struct save_area *save_area;
+
if (is_kdump_kernel())
return;
+ if (!OLDMEM_BASE && (address == boot_cpu_address ||
+ ipl_info.type != IPL_TYPE_FCP_DUMP))
+ return;
if (cpu >= NR_CPUS) {
- pr_warning("CPU %i exceeds the maximum %i and is excluded from "
- "the dump\n", cpu, NR_CPUS - 1);
+ pr_warning("CPU %i exceeds the maximum %i and is excluded "
+ "from the dump\n", cpu, NR_CPUS - 1);
return;
}
- zfcpdump_save_areas[cpu] = kmalloc(sizeof(struct save_area), GFP_KERNEL);
- while (raw_sigp(phy_cpu, sigp_stop_and_store_status) == sigp_busy)
- cpu_relax();
- memcpy_real(zfcpdump_save_areas[cpu],
- (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
- sizeof(struct save_area));
+ save_area = kmalloc(sizeof(struct save_area), GFP_KERNEL);
+ if (!save_area)
+ panic("could not allocate memory for save area\n");
+ zfcpdump_save_areas[cpu] = save_area;
+ #ifdef CONFIG_CRASH_DUMP
+ if (address == boot_cpu_address) {
+ /* Copy the registers of the boot cpu. */
+ copy_oldmem_page(1, (void *) save_area, sizeof(*save_area),
+ SAVE_AREA_BASE - PAGE_SIZE, 0);
+ return;
+ }
+ #endif
+ /* Get the registers of a non-boot cpu. */
+ __pcpu_sigp_relax(address, sigp_stop_and_store_status, 0, NULL);
+ memcpy_real(save_area, lc + SAVE_AREA_BASE, sizeof(*save_area));
}
- struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
- EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
-
- #else
-
- static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { }
-
- #endif /* CONFIG_ZFCPDUMP */
-
- static int cpu_known(int cpu_id)
+ int smp_store_status(int cpu)
{
- int cpu;
+ struct pcpu *pcpu;
- for_each_present_cpu(cpu) {
- if (__cpu_logical_map[cpu] == cpu_id)
- return 1;
- }
+ pcpu = pcpu_devices + cpu;
+ if (__pcpu_sigp_relax(pcpu->address, sigp_stop_and_store_status,
+ 0, NULL) != sigp_order_code_accepted)
+ return -EIO;
return 0;
}
- static int smp_rescan_cpus_sigp(cpumask_t avail)
- {
- int cpu_id, logical_cpu;
+ #else /* CONFIG_ZFCPDUMP || CONFIG_CRASH_DUMP */
- logical_cpu = cpumask_first(&avail);
- if (logical_cpu >= nr_cpu_ids)
- return 0;
- for (cpu_id = 0; cpu_id <= MAX_CPU_ADDRESS; cpu_id++) {
- if (cpu_known(cpu_id))
- continue;
- __cpu_logical_map[logical_cpu] = cpu_id;
- cpu_set_polarization(logical_cpu, POLARIZATION_UNKNOWN);
- if (!cpu_stopped(logical_cpu))
- continue;
- set_cpu_present(logical_cpu, true);
- smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
- logical_cpu = cpumask_next(logical_cpu, &avail);
- if (logical_cpu >= nr_cpu_ids)
- break;
- }
- return 0;
- }
+ static inline void smp_get_save_area(int cpu, u16 address) { }
- static int smp_rescan_cpus_sclp(cpumask_t avail)
+ #endif /* CONFIG_ZFCPDUMP || CONFIG_CRASH_DUMP */
+
+ static struct sclp_cpu_info *smp_get_cpu_info(void)
{
+ static int use_sigp_detection;
struct sclp_cpu_info *info;
- int cpu_id, logical_cpu, cpu;
- int rc;
-
- logical_cpu = cpumask_first(&avail);
- if (logical_cpu >= nr_cpu_ids)
- return 0;
- info = kmalloc(sizeof(*info), GFP_KERNEL);
- if (!info)
- return -ENOMEM;
- rc = sclp_get_cpu_info(info);
- if (rc)
- goto out;
- for (cpu = 0; cpu < info->combined; cpu++) {
- if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
- continue;
- cpu_id = info->cpu[cpu].address;
- if (cpu_known(cpu_id))
- continue;
- __cpu_logical_map[logical_cpu] = cpu_id;
- cpu_set_polarization(logical_cpu, POLARIZATION_UNKNOWN);
- set_cpu_present(logical_cpu, true);
- if (cpu >= info->configured)
- smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY;
- else
- smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
- logical_cpu = cpumask_next(logical_cpu, &avail);
- if (logical_cpu >= nr_cpu_ids)
- break;
+ int address;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (info && (use_sigp_detection || sclp_get_cpu_info(info))) {
+ use_sigp_detection = 1;
+ for (address = 0; address <= MAX_CPU_ADDRESS; address++) {
+ if (__pcpu_sigp_relax(address, sigp_sense, 0, NULL) ==
+ sigp_not_operational)
+ continue;
+ info->cpu[info->configured].address = address;
+ info->configured++;
+ }
+ info->combined = info->configured;
}
- out:
- kfree(info);
- return rc;
+ return info;
}
- static int __smp_rescan_cpus(void)
+ static int __devinit smp_add_present_cpu(int cpu);
+
+ static int __devinit __smp_rescan_cpus(struct sclp_cpu_info *info,
+ int sysfs_add)
{
+ struct pcpu *pcpu;
cpumask_t avail;
+ int cpu, nr, i;
+ nr = 0;
cpumask_xor(&avail, cpu_possible_mask, cpu_present_mask);
- if (smp_use_sigp_detection)
- return smp_rescan_cpus_sigp(avail);
- else
- return smp_rescan_cpus_sclp(avail);
+ cpu = cpumask_first(&avail);
+ for (i = 0; (i < info->combined) && (cpu < nr_cpu_ids); i++) {
+ if (info->has_cpu_type && info->cpu[i].type != boot_cpu_type)
+ continue;
+ if (pcpu_find_address(cpu_present_mask, info->cpu[i].address))
+ continue;
+ pcpu = pcpu_devices + cpu;
+ pcpu->address = info->cpu[i].address;
+ pcpu->state = (cpu >= info->configured) ?
+ CPU_STATE_STANDBY : CPU_STATE_CONFIGURED;
+ 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);
+ }
+ return nr;
}
static void __init smp_detect_cpus(void)
{
unsigned int cpu, c_cpus, s_cpus;
struct sclp_cpu_info *info;
- u16 boot_cpu_addr, cpu_addr;
- c_cpus = 1;
- s_cpus = 0;
- boot_cpu_addr = __cpu_logical_map[0];
- info = kmalloc(sizeof(*info), GFP_KERNEL);
+ info = smp_get_cpu_info();
if (!info)
panic("smp_detect_cpus failed to allocate memory\n");
- #ifdef CONFIG_CRASH_DUMP
- if (OLDMEM_BASE && !is_kdump_kernel()) {
- struct save_area *save_area;
-
- save_area = kmalloc(sizeof(*save_area), GFP_KERNEL);
- if (!save_area)
- panic("could not allocate memory for save area\n");
- copy_oldmem_page(1, (void *) save_area, sizeof(*save_area),
- 0x200, 0);
- zfcpdump_save_areas[0] = save_area;
- }
- #endif
- /* Use sigp detection algorithm if sclp doesn't work. */
- if (sclp_get_cpu_info(info)) {
- smp_use_sigp_detection = 1;
- for (cpu = 0; cpu <= MAX_CPU_ADDRESS; cpu++) {
- if (cpu == boot_cpu_addr)
- continue;
- if (!raw_cpu_stopped(cpu))
- continue;
- smp_get_save_area(c_cpus, cpu);
- c_cpus++;
- }
- goto out;
- }
-
if (info->has_cpu_type) {
for (cpu = 0; cpu < info->combined; cpu++) {
- if (info->cpu[cpu].address == boot_cpu_addr) {
- smp_cpu_type = info->cpu[cpu].type;
- break;
- }
+ if (info->cpu[cpu].address != boot_cpu_address)
+ continue;
+ /* The boot cpu dictates the cpu type. */
+ boot_cpu_type = info->cpu[cpu].type;
+ break;
}
}
-
+ c_cpus = s_cpus = 0;
for (cpu = 0; cpu < info->combined; cpu++) {
- if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
+ if (info->has_cpu_type && info->cpu[cpu].type != boot_cpu_type)
continue;
- cpu_addr = info->cpu[cpu].address;
- if (cpu_addr == boot_cpu_addr)
- continue;
- if (!raw_cpu_stopped(cpu_addr)) {
+ if (cpu < info->configured) {
+ smp_get_save_area(c_cpus, info->cpu[cpu].address);
+ c_cpus++;
+ } else
s_cpus++;
- continue;
- }
- smp_get_save_area(c_cpus, cpu_addr);
- c_cpus++;
}
- out:
- kfree(info);
pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus);
get_online_cpus();
- __smp_rescan_cpus();
+ __smp_rescan_cpus(info, 0);
put_online_cpus();
+ kfree(info);
}
/*
* Activate a secondary processor.
*/
- int __cpuinit start_secondary(void *cpuvoid)
+ static void __cpuinit smp_start_secondary(void *cpuvoid)
{
+ S390_lowcore.last_update_clock = get_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();
init_cpu_vtimer();
pfault_init();
-
notify_cpu_starting(smp_processor_id());
ipi_call_lock();
set_cpu_online(smp_processor_id(), true);
ipi_call_unlock();
- __ctl_clear_bit(0, 28); /* Disable lowcore protection */
- S390_lowcore.restart_psw.mask =
- PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
- S390_lowcore.restart_psw.addr =
- PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
- __ctl_set_bit(0, 28); /* Enable lowcore protection */
- /*
- * Wait until the cpu which brought this one up marked it
- * active before enabling interrupts.
- */
- while (!cpumask_test_cpu(smp_processor_id(), cpu_active_mask))
- cpu_relax();
local_irq_enable();
/* cpu_idle will call schedule for us */
cpu_idle();
- return 0;
}
struct create_idle {
complete(&c_idle->done);
}
- static int __cpuinit smp_alloc_lowcore(int cpu)
- {
- unsigned long async_stack, panic_stack;
- struct _lowcore *lowcore;
-
- lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
- if (!lowcore)
- return -ENOMEM;
- async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
- panic_stack = __get_free_page(GFP_KERNEL);
- if (!panic_stack || !async_stack)
- goto out;
- memcpy(lowcore, &S390_lowcore, 512);
- memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512);
- lowcore->async_stack = async_stack + ASYNC_SIZE;
- lowcore->panic_stack = panic_stack + PAGE_SIZE;
- lowcore->restart_psw.mask =
- PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
- lowcore->restart_psw.addr =
- PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
- if (user_mode != HOME_SPACE_MODE)
- lowcore->restart_psw.mask |= PSW_ASC_HOME;
- #ifndef CONFIG_64BIT
- if (MACHINE_HAS_IEEE) {
- unsigned long save_area;
-
- save_area = get_zeroed_page(GFP_KERNEL);
- if (!save_area)
- goto out;
- lowcore->extended_save_area_addr = (u32) save_area;
- }
- #else
- if (vdso_alloc_per_cpu(cpu, lowcore))
- goto out;
- #endif
- lowcore_ptr[cpu] = lowcore;
- return 0;
-
- out:
- free_page(panic_stack);
- free_pages(async_stack, ASYNC_ORDER);
- free_pages((unsigned long) lowcore, LC_ORDER);
- return -ENOMEM;
- }
-
- static void smp_free_lowcore(int cpu)
- {
- struct _lowcore *lowcore;
-
- lowcore = lowcore_ptr[cpu];
- #ifndef CONFIG_64BIT
- if (MACHINE_HAS_IEEE)
- free_page((unsigned long) lowcore->extended_save_area_addr);
- #else
- vdso_free_per_cpu(cpu, lowcore);
- #endif
- free_page(lowcore->panic_stack - PAGE_SIZE);
- free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER);
- free_pages((unsigned long) lowcore, LC_ORDER);
- lowcore_ptr[cpu] = NULL;
- }
-
/* Upping and downing of CPUs */
int __cpuinit __cpu_up(unsigned int cpu)
{
- struct _lowcore *cpu_lowcore;
struct create_idle c_idle;
- struct task_struct *idle;
- struct stack_frame *sf;
- u32 lowcore;
- int ccode;
+ struct pcpu *pcpu;
+ int rc;
- if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED)
+ pcpu = pcpu_devices + cpu;
+ if (pcpu->state != CPU_STATE_CONFIGURED)
+ return -EIO;
+ if (pcpu_sigp_retry(pcpu, sigp_initial_cpu_reset, 0) !=
+ sigp_order_code_accepted)
return -EIO;
- idle = current_set[cpu];
- if (!idle) {
+ if (!pcpu->idle) {
c_idle.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done);
INIT_WORK_ONSTACK(&c_idle.work, smp_fork_idle);
c_idle.cpu = cpu;
wait_for_completion(&c_idle.done);
if (IS_ERR(c_idle.idle))
return PTR_ERR(c_idle.idle);
- idle = c_idle.idle;
- current_set[cpu] = c_idle.idle;
+ pcpu->idle = c_idle.idle;
}
- init_idle(idle, cpu);
- if (smp_alloc_lowcore(cpu))
- return -ENOMEM;
- do {
- ccode = sigp(cpu, sigp_initial_cpu_reset);
- if (ccode == sigp_busy)
- udelay(10);
- if (ccode == sigp_not_operational)
- goto err_out;
- } while (ccode == sigp_busy);
-
- lowcore = (u32)(unsigned long)lowcore_ptr[cpu];
- while (sigp_p(lowcore, cpu, sigp_set_prefix) == sigp_busy)
- udelay(10);
-
- cpu_lowcore = lowcore_ptr[cpu];
- cpu_lowcore->kernel_stack = (unsigned long)
- task_stack_page(idle) + THREAD_SIZE;
- cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle);
- sf = (struct stack_frame *) (cpu_lowcore->kernel_stack
- - sizeof(struct pt_regs)
- - sizeof(struct stack_frame));
- memset(sf, 0, sizeof(struct stack_frame));
- sf->gprs[9] = (unsigned long) sf;
- cpu_lowcore->gpregs_save_area[15] = (unsigned long) sf;
- __ctl_store(cpu_lowcore->cregs_save_area, 0, 15);
- atomic_inc(&init_mm.context.attach_count);
- asm volatile(
- " stam 0,15,0(%0)"
- : : "a" (&cpu_lowcore->access_regs_save_area) : "memory");
- cpu_lowcore->percpu_offset = __per_cpu_offset[cpu];
- cpu_lowcore->current_task = (unsigned long) idle;
- cpu_lowcore->cpu_nr = cpu;
- cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce;
- cpu_lowcore->machine_flags = S390_lowcore.machine_flags;
- cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func;
- memcpy(cpu_lowcore->stfle_fac_list, S390_lowcore.stfle_fac_list,
- MAX_FACILITY_BIT/8);
- eieio();
-
- while (sigp(cpu, sigp_restart) == sigp_busy)
- udelay(10);
-
+ init_idle(pcpu->idle, cpu);
+ rc = pcpu_alloc_lowcore(pcpu, cpu);
+ if (rc)
+ return rc;
+ pcpu_prepare_secondary(pcpu, cpu);
+ pcpu_attach_task(pcpu, pcpu->idle);
+ pcpu_start_fn(pcpu, smp_start_secondary, NULL);
while (!cpu_online(cpu))
cpu_relax();
return 0;
-
- err_out:
- smp_free_lowcore(cpu);
- return -EIO;
}
static int __init setup_possible_cpus(char *s)
{
- int pcpus, cpu;
+ int max, cpu;
- pcpus = simple_strtoul(s, NULL, 0);
+ if (kstrtoint(s, 0, &max) < 0)
+ return 0;
init_cpu_possible(cpumask_of(0));
- for (cpu = 1; cpu < pcpus && cpu < nr_cpu_ids; cpu++)
+ for (cpu = 1; cpu < max && cpu < nr_cpu_ids; cpu++)
set_cpu_possible(cpu, true);
return 0;
}
int __cpu_disable(void)
{
- struct ec_creg_mask_parms cr_parms;
- int cpu = smp_processor_id();
-
- set_cpu_online(cpu, false);
+ unsigned long cregs[16];
- /* Disable pfault pseudo page faults on this cpu. */
+ set_cpu_online(smp_processor_id(), false);
+ /* Disable pseudo page faults on this cpu. */
pfault_fini();
-
- memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals));
- memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals));
-
- /* disable all external interrupts */
- cr_parms.orvals[0] = 0;
- cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 11 |
- 1 << 10 | 1 << 9 | 1 << 6 | 1 << 5 |
- 1 << 4);
- /* disable all I/O interrupts */
- cr_parms.orvals[6] = 0;
- cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
- 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
- /* disable most machine checks */
- cr_parms.orvals[14] = 0;
- cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
- 1 << 25 | 1 << 24);
-
- smp_ctl_bit_callback(&cr_parms);
-
+ /* 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);
return 0;
}
void __cpu_die(unsigned int cpu)
{
+ struct pcpu *pcpu;
+
/* Wait until target cpu is down */
- while (!cpu_stopped(cpu))
+ pcpu = pcpu_devices + cpu;
+ while (!pcpu_stopped(pcpu))
cpu_relax();
- while (sigp_p(0, cpu, sigp_set_prefix) == sigp_busy)
- udelay(10);
- smp_free_lowcore(cpu);
+ pcpu_free_lowcore(pcpu);
atomic_dec(&init_mm.context.attach_count);
}
void __noreturn cpu_die(void)
{
idle_task_exit();
- while (sigp(smp_processor_id(), sigp_stop) == sigp_busy)
- cpu_relax();
- for (;;);
+ pcpu_sigp_retry(pcpu_devices + smp_processor_id(), sigp_stop, 0);
+ for (;;) ;
}
#endif /* CONFIG_HOTPLUG_CPU */
- void __init smp_prepare_cpus(unsigned int max_cpus)
+ static void smp_call_os_info_init_fn(void)
{
- #ifndef CONFIG_64BIT
- unsigned long save_area = 0;
- #endif
- unsigned long async_stack, panic_stack;
- struct _lowcore *lowcore;
+ int (*init_fn)(void);
+ unsigned long size;
- smp_detect_cpus();
+ init_fn = os_info_old_entry(OS_INFO_INIT_FN, &size);
+ if (!init_fn)
+ return;
+ init_fn();
+ }
+ void __init smp_prepare_cpus(unsigned int max_cpus)
+ {
/* request the 0x1201 emergency signal external interrupt */
if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0)
panic("Couldn't request external interrupt 0x1201");
/* request the 0x1202 external call external interrupt */
if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0)
panic("Couldn't request external interrupt 0x1202");
-
- /* Reallocate current lowcore, but keep its contents. */
- lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
- panic_stack = __get_free_page(GFP_KERNEL);
- async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
- BUG_ON(!lowcore || !panic_stack || !async_stack);
- #ifndef CONFIG_64BIT
- if (MACHINE_HAS_IEEE)
- save_area = get_zeroed_page(GFP_KERNEL);
- #endif
- local_irq_disable();
- local_mcck_disable();
- lowcore_ptr[smp_processor_id()] = lowcore;
- *lowcore = S390_lowcore;
- lowcore->panic_stack = panic_stack + PAGE_SIZE;
- lowcore->async_stack = async_stack + ASYNC_SIZE;
- #ifndef CONFIG_64BIT
- if (MACHINE_HAS_IEEE)
- lowcore->extended_save_area_addr = (u32) save_area;
- #endif
- set_prefix((u32)(unsigned long) lowcore);
- local_mcck_enable();
- local_irq_enable();
- #ifdef CONFIG_64BIT
- if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore))
- BUG();
- #endif
+ smp_call_os_info_init_fn();
+ smp_detect_cpus();
}
void __init smp_prepare_boot_cpu(void)
{
- BUG_ON(smp_processor_id() != 0);
-
- current_thread_info()->cpu = 0;
- set_cpu_present(0, true);
- set_cpu_online(0, true);
+ struct pcpu *pcpu = pcpu_devices;
+
+ boot_cpu_address = stap();
+ pcpu->idle = current;
+ pcpu->state = CPU_STATE_CONFIGURED;
+ pcpu->address = boot_cpu_address;
+ pcpu->lowcore = (struct _lowcore *)(unsigned long) store_prefix();
+ pcpu->async_stack = S390_lowcore.async_stack - ASYNC_SIZE;
+ pcpu->panic_stack = S390_lowcore.panic_stack - PAGE_SIZE;
S390_lowcore.percpu_offset = __per_cpu_offset[0];
- current_set[0] = current;
- smp_cpu_state[0] = CPU_STATE_CONFIGURED;
cpu_set_polarization(0, POLARIZATION_UNKNOWN);
+ set_cpu_present(0, true);
+ set_cpu_online(0, true);
}
void __init smp_cpus_done(unsigned int max_cpus)
void __init smp_setup_processor_id(void)
{
S390_lowcore.cpu_nr = 0;
- __cpu_logical_map[0] = stap();
}
/*
#ifdef CONFIG_HOTPLUG_CPU
static ssize_t cpu_configure_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+ struct device_attribute *attr, char *buf)
{
ssize_t count;
mutex_lock(&smp_cpu_state_mutex);
- count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]);
+ count = sprintf(buf, "%d\n", pcpu_devices[dev->id].state);
mutex_unlock(&smp_cpu_state_mutex);
return count;
}
static ssize_t cpu_configure_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
- int cpu = dev->id;
- int val, rc;
+ struct pcpu *pcpu;
+ int cpu, val, rc;
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;
if (cpu_online(cpu) || cpu == 0)
goto out;
+ pcpu = pcpu_devices + cpu;
rc = 0;
switch (val) {
case 0:
- if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) {
- rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]);
- if (!rc) {
- smp_cpu_state[cpu] = CPU_STATE_STANDBY;
- cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
- topology_expect_change();
- }
- }
+ if (pcpu->state != CPU_STATE_CONFIGURED)
+ break;
+ rc = sclp_cpu_deconfigure(pcpu->address);
+ if (rc)
+ break;
+ pcpu->state = CPU_STATE_STANDBY;
+ cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
+ topology_expect_change();
break;
case 1:
- if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) {
- rc = sclp_cpu_configure(__cpu_logical_map[cpu]);
- if (!rc) {
- smp_cpu_state[cpu] = CPU_STATE_CONFIGURED;
- cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
- topology_expect_change();
- }
- }
+ if (pcpu->state != CPU_STATE_STANDBY)
+ break;
+ rc = sclp_cpu_configure(pcpu->address);
+ if (rc)
+ break;
+ pcpu->state = CPU_STATE_CONFIGURED;
+ cpu_set_polarization(cpu, POLARIZATION_UNKNOWN);
+ topology_expect_change();
break;
default:
break;
static ssize_t show_cpu_address(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]);
+ return sprintf(buf, "%d\n", pcpu_devices[dev->id].address);
}
static DEVICE_ATTR(address, 0444, show_cpu_address, NULL);
static ssize_t show_idle_count(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct s390_idle_data *idle;
+ struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
unsigned long long idle_count;
unsigned int sequence;
- idle = &per_cpu(s390_idle, dev->id);
- repeat:
- sequence = idle->sequence;
- smp_rmb();
- if (sequence & 1)
- goto repeat;
- idle_count = idle->idle_count;
- if (idle->idle_enter)
- idle_count++;
- smp_rmb();
- if (idle->sequence != sequence)
- goto repeat;
+ do {
+ sequence = ACCESS_ONCE(idle->sequence);
+ idle_count = ACCESS_ONCE(idle->idle_count);
+ if (ACCESS_ONCE(idle->idle_enter))
+ idle_count++;
+ } while ((sequence & 1) || (idle->sequence != sequence));
return sprintf(buf, "%llu\n", idle_count);
}
static DEVICE_ATTR(idle_count, 0444, show_idle_count, NULL);
static ssize_t show_idle_time(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct s390_idle_data *idle;
- unsigned long long now, idle_time, idle_enter;
+ struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id);
+ unsigned long long now, idle_time, idle_enter, idle_exit;
unsigned int sequence;
- idle = &per_cpu(s390_idle, dev->id);
- now = get_clock();
- repeat:
- sequence = idle->sequence;
- smp_rmb();
- if (sequence & 1)
- goto repeat;
- idle_time = idle->idle_time;
- idle_enter = idle->idle_enter;
- if (idle_enter != 0ULL && idle_enter < now)
- idle_time += now - idle_enter;
- smp_rmb();
- if (idle->sequence != sequence)
- goto repeat;
+ do {
+ now = get_clock();
+ sequence = ACCESS_ONCE(idle->sequence);
+ idle_time = ACCESS_ONCE(idle->idle_time);
+ idle_enter = ACCESS_ONCE(idle->idle_enter);
+ idle_exit = ACCESS_ONCE(idle->idle_exit);
+ } while ((sequence & 1) || (idle->sequence != sequence));
+ idle_time += idle_enter ? ((idle_exit ? : now) - idle_enter) : 0;
return sprintf(buf, "%llu\n", idle_time >> 12);
}
static DEVICE_ATTR(idle_time_us, 0444, show_idle_time, NULL);
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned int)(long)hcpu;
- struct cpu *c = &per_cpu(cpu_devices, cpu);
+ struct cpu *c = &pcpu_devices[cpu].cpu;
struct device *s = &c->dev;
struct s390_idle_data *idle;
int err = 0;
static int __devinit smp_add_present_cpu(int cpu)
{
- struct cpu *c = &per_cpu(cpu_devices, cpu);
+ struct cpu *c = &pcpu_devices[cpu].cpu;
struct device *s = &c->dev;
int rc;
int __ref smp_rescan_cpus(void)
{
- cpumask_t newcpus;
- int cpu;
- int rc;
+ struct sclp_cpu_info *info;
+ int nr;
+ info = smp_get_cpu_info();
+ if (!info)
+ return -ENOMEM;
get_online_cpus();
mutex_lock(&smp_cpu_state_mutex);
- cpumask_copy(&newcpus, cpu_present_mask);
- rc = __smp_rescan_cpus();
- if (rc)
- goto out;
- cpumask_andnot(&newcpus, cpu_present_mask, &newcpus);
- for_each_cpu(cpu, &newcpus) {
- rc = smp_add_present_cpu(cpu);
- if (rc)
- set_cpu_present(cpu, false);
- }
- rc = 0;
- out:
+ nr = __smp_rescan_cpus(info, 1);
mutex_unlock(&smp_cpu_state_mutex);
put_online_cpus();
- if (!cpumask_empty(&newcpus))
+ kfree(info);
+ if (nr)
topology_schedule_update();
- return rc;
+ return 0;
}
static ssize_t __ref rescan_store(struct device *dev,
projects / firefly-linux-kernel-4.4.55.git / commitdiff