diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/s390/kernel/smp.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/s390/kernel/smp.c | 1146 |
1 files changed, 0 insertions, 1146 deletions
diff --git a/ANDROID_3.4.5/arch/s390/kernel/smp.c b/ANDROID_3.4.5/arch/s390/kernel/smp.c deleted file mode 100644 index 1f772276..00000000 --- a/ANDROID_3.4.5/arch/s390/kernel/smp.c +++ /dev/null @@ -1,1146 +0,0 @@ -/* - * 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/module.h> -#include <linux/init.h> -#include <linux/mm.h> -#include <linux/err.h> -#include <linux/spinlock.h> -#include <linux/kernel_stat.h> -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/irqflags.h> -#include <linux/cpu.h> -#include <linux/slab.h> -#include <linux/crash_dump.h> -#include <asm/asm-offsets.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/timer.h> -#include <asm/lowcore.h> -#include <asm/sclp.h> -#include <asm/vdso.h> -#include <asm/debug.h> -#include <asm/os_info.h> -#include "entry.h" - -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, -}; - -enum { - sigp_order_code_accepted = 0, - sigp_status_stored = 1, - sigp_busy = 2, - sigp_not_operational = 3, -}; - -enum { - ec_schedule = 0, - ec_call_function, - ec_call_function_single, - ec_stop_cpu, -}; - -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); - -/* - * 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; - - 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 inline int __pcpu_sigp_relax(u16 addr, u8 order, u32 parm, u32 *status) -{ - int cc; - - while (1) { - cc = __pcpu_sigp(addr, order, parm, status); - if (cc != sigp_busy) - return cc; - cpu_relax(); - } -} - -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) -{ - if (__pcpu_sigp(pcpu->address, sigp_sense_running, - 0, &pcpu->status) != sigp_status_stored) - return 1; - /* Check for running status */ - return !(pcpu->status & 0x400); -} - -/* - * Find struct pcpu by cpu address. - */ -static struct pcpu *pcpu_find_address(const struct cpumask *mask, int address) -{ - int cpu; - - 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; - } - 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; -} - -static void pcpu_free_lowcore(struct pcpu *pcpu) -{ - 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"); -} - -void smp_yield_cpu(int cpu) -{ - 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; - - /* 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(); - } -} - -/* - * 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(struct ext_code ext_code, - unsigned int param32, unsigned long param64) -{ - unsigned long bits; - int cpu; - - cpu = smp_processor_id(); - if (ext_code.code == 0x1202) - kstat_cpu(cpu).irqs[EXTINT_EXC]++; - else - kstat_cpu(cpu).irqs[EXTINT_EMS]++; - /* - * handle bit signal external calls - */ - bits = xchg(&pcpu_devices[cpu].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, &bits)) - generic_smp_call_function_interrupt(); - - if (test_bit(ec_call_function_single, &bits)) - generic_smp_call_function_single_interrupt(); - -} - -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); -} - -void arch_send_call_function_single_ipi(int cpu) -{ - pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single); -} - -#ifndef CONFIG_64BIT -/* - * this function sends a 'purge tlb' signal to another CPU. - */ -static void smp_ptlb_callback(void *info) -{ - __tlb_flush_local(); -} - -void smp_ptlb_all(void) -{ - on_each_cpu(smp_ptlb_callback, NULL, 1); -} -EXPORT_SYMBOL(smp_ptlb_all); -#endif /* ! CONFIG_64BIT */ - -/* - * 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); -} - -/* - * 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); -} - -/* - * 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); -} -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); -} -EXPORT_SYMBOL(smp_ctl_clear_bit); - -#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP) - -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) -{ - 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); - return; - } - 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)); -} - -int smp_store_status(int cpu) -{ - struct pcpu *pcpu; - - 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; -} - -#else /* CONFIG_ZFCPDUMP || CONFIG_CRASH_DUMP */ - -static inline void smp_get_save_area(int cpu, u16 address) { } - -#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 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; - } - return info; -} - -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); - 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; - - info = smp_get_cpu_info(); - if (!info) - panic("smp_detect_cpus failed to allocate memory\n"); - if (info->has_cpu_type) { - for (cpu = 0; cpu < info->combined; cpu++) { - 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 != boot_cpu_type) - continue; - if (cpu < info->configured) { - smp_get_save_area(c_cpus, info->cpu[cpu].address); - c_cpus++; - } else - s_cpus++; - } - pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus); - get_online_cpus(); - __smp_rescan_cpus(info, 0); - put_online_cpus(); - kfree(info); -} - -/* - * Activate a secondary processor. - */ -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(); - local_irq_enable(); - /* cpu_idle will call schedule for us */ - cpu_idle(); -} - -struct create_idle { - struct work_struct work; - struct task_struct *idle; - struct completion done; - int cpu; -}; - -static void __cpuinit smp_fork_idle(struct work_struct *work) -{ - struct create_idle *c_idle; - - c_idle = container_of(work, struct create_idle, work); - c_idle->idle = fork_idle(c_idle->cpu); - complete(&c_idle->done); -} - -/* Upping and downing of CPUs */ -int __cpuinit __cpu_up(unsigned int cpu) -{ - struct create_idle c_idle; - struct pcpu *pcpu; - int rc; - - 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; - 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; - schedule_work(&c_idle.work); - wait_for_completion(&c_idle.done); - if (IS_ERR(c_idle.idle)) - return PTR_ERR(c_idle.idle); - pcpu->idle = c_idle.idle; - } - 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; -} - -static int __init setup_possible_cpus(char *s) -{ - int max, cpu; - - if (kstrtoint(s, 0, &max) < 0) - return 0; - init_cpu_possible(cpumask_of(0)); - for (cpu = 1; cpu < max && cpu < nr_cpu_ids; cpu++) - set_cpu_possible(cpu, true); - return 0; -} -early_param("possible_cpus", setup_possible_cpus); - -#ifdef CONFIG_HOTPLUG_CPU - -int __cpu_disable(void) -{ - unsigned long cregs[16]; - - 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); - return 0; -} - -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); - atomic_dec(&init_mm.context.attach_count); -} - -void __noreturn cpu_die(void) -{ - idle_task_exit(); - pcpu_sigp_retry(pcpu_devices + smp_processor_id(), sigp_stop, 0); - for (;;) ; -} - -#endif /* CONFIG_HOTPLUG_CPU */ - -static void smp_call_os_info_init_fn(void) -{ - int (*init_fn)(void); - unsigned long size; - - 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"); - smp_call_os_info_init_fn(); - smp_detect_cpus(); -} - -void __init smp_prepare_boot_cpu(void) -{ - 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]; - 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; -} - -/* - * 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; -} - -#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; -} - -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; - 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 (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 (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; - } -out: - mutex_unlock(&smp_cpu_state_mutex); - put_online_cpus(); - return rc ? rc : count; -} -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); -} -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 ssize_t show_capability(struct device *dev, - struct device_attribute *attr, char *buf) -{ - unsigned int capability; - int rc; - - rc = get_cpu_capability(&capability); - if (rc) - return rc; - return sprintf(buf, "%u\n", capability); -} -static DEVICE_ATTR(capability, 0444, show_capability, NULL); - -static ssize_t show_idle_count(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id); - unsigned long long idle_count; - unsigned int sequence; - - 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 = &per_cpu(s390_idle, dev->id); - unsigned long long now, idle_time, idle_enter, idle_exit; - unsigned int sequence; - - 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); - -static struct attribute *cpu_online_attrs[] = { - &dev_attr_capability.attr, - &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 __cpuinit smp_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) -{ - unsigned int cpu = (unsigned int)(long)hcpu; - struct cpu *c = &pcpu_devices[cpu].cpu; - struct device *s = &c->dev; - struct s390_idle_data *idle; - int err = 0; - - switch (action) { - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - idle = &per_cpu(s390_idle, cpu); - memset(idle, 0, sizeof(struct s390_idle_data)); - err = sysfs_create_group(&s->kobj, &cpu_online_attr_group); - break; - case CPU_DEAD: - case CPU_DEAD_FROZEN: - sysfs_remove_group(&s->kobj, &cpu_online_attr_group); - break; - } - return notifier_from_errno(err); -} - -static struct notifier_block __cpuinitdata smp_cpu_nb = { - .notifier_call = smp_cpu_notify, -}; - -static int __devinit smp_add_present_cpu(int cpu) -{ - struct cpu *c = &pcpu_devices[cpu].cpu; - struct device *s = &c->dev; - int rc; - - 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; - if (cpu_online(cpu)) { - rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); - if (rc) - goto out_online; - } - rc = topology_cpu_init(c); - if (rc) - goto out_topology; - return 0; - -out_topology: - if (cpu_online(cpu)) - sysfs_remove_group(&s->kobj, &cpu_online_attr_group); -out_online: - sysfs_remove_group(&s->kobj, &cpu_common_attr_group); -out_cpu: -#ifdef CONFIG_HOTPLUG_CPU - unregister_cpu(c); -#endif -out: - return rc; -} - -#ifdef CONFIG_HOTPLUG_CPU - -int __ref smp_rescan_cpus(void) -{ - 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); - nr = __smp_rescan_cpus(info, 1); - mutex_unlock(&smp_cpu_state_mutex); - put_online_cpus(); - kfree(info); - if (nr) - topology_schedule_update(); - return 0; -} - -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; -} -static DEVICE_ATTR(rescan, 0200, NULL, rescan_store); -#endif /* CONFIG_HOTPLUG_CPU */ - -static int __init s390_smp_init(void) -{ - int cpu, rc; - - register_cpu_notifier(&smp_cpu_nb); -#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) - return rc; - } - return 0; -} -subsys_initcall(s390_smp_init); |