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Diffstat (limited to 'arch/mn10300/kernel/smp.c')
| -rw-r--r-- | arch/mn10300/kernel/smp.c | 1141 |
1 files changed, 1141 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/smp.c b/arch/mn10300/kernel/smp.c new file mode 100644 index 000000000000..b80234c28e0d --- /dev/null +++ b/arch/mn10300/kernel/smp.c @@ -0,0 +1,1141 @@ +/* SMP support routines. + * + * Copyright (C) 2006-2008 Panasonic Corporation + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/init.h> +#include <linux/jiffies.h> +#include <linux/cpumask.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/sched.h> +#include <linux/profile.h> +#include <linux/smp.h> +#include <asm/tlbflush.h> +#include <asm/system.h> +#include <asm/bitops.h> +#include <asm/processor.h> +#include <asm/bug.h> +#include <asm/exceptions.h> +#include <asm/hardirq.h> +#include <asm/fpu.h> +#include <asm/mmu_context.h> +#include <asm/thread_info.h> +#include <asm/cpu-regs.h> +#include <asm/intctl-regs.h> +#include "internal.h" + +#ifdef CONFIG_HOTPLUG_CPU +#include <linux/cpu.h> +#include <asm/cacheflush.h> + +static unsigned long sleep_mode[NR_CPUS]; + +static void run_sleep_cpu(unsigned int cpu); +static void run_wakeup_cpu(unsigned int cpu); +#endif /* CONFIG_HOTPLUG_CPU */ + +/* + * Debug Message function + */ + +#undef DEBUG_SMP +#ifdef DEBUG_SMP +#define Dprintk(fmt, ...) printk(KERN_DEBUG fmt, ##__VA_ARGS__) +#else +#define Dprintk(fmt, ...) no_printk(KERN_DEBUG fmt, ##__VA_ARGS__) +#endif + +/* timeout value in msec for smp_nmi_call_function. zero is no timeout. */ +#define CALL_FUNCTION_NMI_IPI_TIMEOUT 0 + +/* + * Structure and data for smp_nmi_call_function(). + */ +struct nmi_call_data_struct { + smp_call_func_t func; + void *info; + cpumask_t started; + cpumask_t finished; + int wait; + char size_alignment[0] + __attribute__ ((__aligned__(SMP_CACHE_BYTES))); +} __attribute__ ((__aligned__(SMP_CACHE_BYTES))); + +static DEFINE_SPINLOCK(smp_nmi_call_lock); +static struct nmi_call_data_struct *nmi_call_data; + +/* + * Data structures and variables + */ +static cpumask_t cpu_callin_map; /* Bitmask of callin CPUs */ +static cpumask_t cpu_callout_map; /* Bitmask of callout CPUs */ +cpumask_t cpu_boot_map; /* Bitmask of boot APs */ +unsigned long start_stack[NR_CPUS - 1]; + +/* + * Per CPU parameters + */ +struct mn10300_cpuinfo cpu_data[NR_CPUS] __cacheline_aligned; + +static int cpucount; /* The count of boot CPUs */ +static cpumask_t smp_commenced_mask; +cpumask_t cpu_initialized __initdata = CPU_MASK_NONE; + +/* + * Function Prototypes + */ +static int do_boot_cpu(int); +static void smp_show_cpu_info(int cpu_id); +static void smp_callin(void); +static void smp_online(void); +static void smp_store_cpu_info(int); +static void smp_cpu_init(void); +static void smp_tune_scheduling(void); +static void send_IPI_mask(const cpumask_t *cpumask, int irq); +static void init_ipi(void); + +/* + * IPI Initialization interrupt definitions + */ +static void mn10300_ipi_disable(unsigned int irq); +static void mn10300_ipi_enable(unsigned int irq); +static void mn10300_ipi_ack(unsigned int irq); +static void mn10300_ipi_nop(unsigned int irq); + +static struct irq_chip mn10300_ipi_type = { + .name = "cpu_ipi", + .disable = mn10300_ipi_disable, + .enable = mn10300_ipi_enable, + .ack = mn10300_ipi_ack, + .eoi = mn10300_ipi_nop +}; + +static irqreturn_t smp_reschedule_interrupt(int irq, void *dev_id); +static irqreturn_t smp_call_function_interrupt(int irq, void *dev_id); +static irqreturn_t smp_ipi_timer_interrupt(int irq, void *dev_id); + +static struct irqaction reschedule_ipi = { + .handler = smp_reschedule_interrupt, + .name = "smp reschedule IPI" +}; +static struct irqaction call_function_ipi = { + .handler = smp_call_function_interrupt, + .name = "smp call function IPI" +}; +static struct irqaction local_timer_ipi = { + .handler = smp_ipi_timer_interrupt, + .flags = IRQF_DISABLED, + .name = "smp local timer IPI" +}; + +/** + * init_ipi - Initialise the IPI mechanism + */ +static void init_ipi(void) +{ + unsigned long flags; + u16 tmp16; + + /* set up the reschedule IPI */ + set_irq_chip_and_handler(RESCHEDULE_IPI, + &mn10300_ipi_type, handle_percpu_irq); + setup_irq(RESCHEDULE_IPI, &reschedule_ipi); + set_intr_level(RESCHEDULE_IPI, RESCHEDULE_GxICR_LV); + mn10300_ipi_enable(RESCHEDULE_IPI); + + /* set up the call function IPI */ + set_irq_chip_and_handler(CALL_FUNC_SINGLE_IPI, + &mn10300_ipi_type, handle_percpu_irq); + setup_irq(CALL_FUNC_SINGLE_IPI, &call_function_ipi); + set_intr_level(CALL_FUNC_SINGLE_IPI, CALL_FUNCTION_GxICR_LV); + mn10300_ipi_enable(CALL_FUNC_SINGLE_IPI); + + /* set up the local timer IPI */ + set_irq_chip_and_handler(LOCAL_TIMER_IPI, + &mn10300_ipi_type, handle_percpu_irq); + setup_irq(LOCAL_TIMER_IPI, &local_timer_ipi); + set_intr_level(LOCAL_TIMER_IPI, LOCAL_TIMER_GxICR_LV); + mn10300_ipi_enable(LOCAL_TIMER_IPI); + +#ifdef CONFIG_MN10300_CACHE_ENABLED + /* set up the cache flush IPI */ + flags = arch_local_cli_save(); + __set_intr_stub(NUM2EXCEP_IRQ_LEVEL(FLUSH_CACHE_GxICR_LV), + mn10300_low_ipi_handler); + GxICR(FLUSH_CACHE_IPI) = FLUSH_CACHE_GxICR_LV | GxICR_DETECT; + mn10300_ipi_enable(FLUSH_CACHE_IPI); + arch_local_irq_restore(flags); +#endif + + /* set up the NMI call function IPI */ + flags = arch_local_cli_save(); + GxICR(CALL_FUNCTION_NMI_IPI) = GxICR_NMI | GxICR_ENABLE | GxICR_DETECT; + tmp16 = GxICR(CALL_FUNCTION_NMI_IPI); + arch_local_irq_restore(flags); + + /* set up the SMP boot IPI */ + flags = arch_local_cli_save(); + __set_intr_stub(NUM2EXCEP_IRQ_LEVEL(SMP_BOOT_GxICR_LV), + mn10300_low_ipi_handler); + arch_local_irq_restore(flags); +} + +/** + * mn10300_ipi_shutdown - Shut down handling of an IPI + * @irq: The IPI to be shut down. + */ +static void mn10300_ipi_shutdown(unsigned int irq) +{ + unsigned long flags; + u16 tmp; + + flags = arch_local_cli_save(); + + tmp = GxICR(irq); + GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_DETECT; + tmp = GxICR(irq); + + arch_local_irq_restore(flags); +} + +/** + * mn10300_ipi_enable - Enable an IPI + * @irq: The IPI to be enabled. + */ +static void mn10300_ipi_enable(unsigned int irq) +{ + unsigned long flags; + u16 tmp; + + flags = arch_local_cli_save(); + + tmp = GxICR(irq); + GxICR(irq) = (tmp & GxICR_LEVEL) | GxICR_ENABLE; + tmp = GxICR(irq); + + arch_local_irq_restore(flags); +} + +/** + * mn10300_ipi_disable - Disable an IPI + * @irq: The IPI to be disabled. + */ +static void mn10300_ipi_disable(unsigned int irq) +{ + unsigned long flags; + u16 tmp; + + flags = arch_local_cli_save(); + + tmp = GxICR(irq); + GxICR(irq) = tmp & GxICR_LEVEL; + tmp = GxICR(irq); + + arch_local_irq_restore(flags); +} + +/** + * mn10300_ipi_ack - Acknowledge an IPI interrupt in the PIC + * @irq: The IPI to be acknowledged. + * + * Clear the interrupt detection flag for the IPI on the appropriate interrupt + * channel in the PIC. + */ +static void mn10300_ipi_ack(unsigned int irq) +{ + unsigned long flags; + u16 tmp; + + flags = arch_local_cli_save(); + GxICR_u8(irq) = GxICR_DETECT; + tmp = GxICR(irq); + arch_local_irq_restore(flags); +} + +/** + * mn10300_ipi_nop - Dummy IPI action + * @irq: The IPI to be acted upon. + */ +static void mn10300_ipi_nop(unsigned int irq) +{ +} + +/** + * send_IPI_mask - Send IPIs to all CPUs in list + * @cpumask: The list of CPUs to target. + * @irq: The IPI request to be sent. + * + * Send the specified IPI to all the CPUs in the list, not waiting for them to + * finish before returning. The caller is responsible for synchronisation if + * that is needed. + */ +static void send_IPI_mask(const cpumask_t *cpumask, int irq) +{ + int i; + u16 tmp; + + for (i = 0; i < NR_CPUS; i++) { + if (cpu_isset(i, *cpumask)) { + /* send IPI */ + tmp = CROSS_GxICR(irq, i); + CROSS_GxICR(irq, i) = + tmp | GxICR_REQUEST | GxICR_DETECT; + tmp = CROSS_GxICR(irq, i); /* flush write buffer */ + } + } +} + +/** + * send_IPI_self - Send an IPI to this CPU. + * @irq: The IPI request to be sent. + * + * Send the specified IPI to the current CPU. + */ +void send_IPI_self(int irq) +{ + send_IPI_mask(cpumask_of(smp_processor_id()), irq); +} + +/** + * send_IPI_allbutself - Send IPIs to all the other CPUs. + * @irq: The IPI request to be sent. + * + * Send the specified IPI to all CPUs in the system barring the current one, + * not waiting for them to finish before returning. The caller is responsible + * for synchronisation if that is needed. + */ +void send_IPI_allbutself(int irq) +{ + cpumask_t cpumask; + + cpumask = cpu_online_map; + cpu_clear(smp_processor_id(), cpumask); + send_IPI_mask(&cpumask, irq); +} + +void arch_send_call_function_ipi_mask(const struct cpumask *mask) +{ + BUG(); + /*send_IPI_mask(mask, CALL_FUNCTION_IPI);*/ +} + +void arch_send_call_function_single_ipi(int cpu) +{ + send_IPI_mask(cpumask_of(cpu), CALL_FUNC_SINGLE_IPI); +} + +/** + * smp_send_reschedule - Send reschedule IPI to a CPU + * @cpu: The CPU to target. + */ +void smp_send_reschedule(int cpu) +{ + send_IPI_mask(cpumask_of(cpu), RESCHEDULE_IPI); +} + +/** + * smp_nmi_call_function - Send a call function NMI IPI to all CPUs + * @func: The function to ask to be run. + * @info: The context data to pass to that function. + * @wait: If true, wait (atomically) until function is run on all CPUs. + * + * Send a non-maskable request to all CPUs in the system, requesting them to + * run the specified function with the given context data, and, potentially, to + * wait for completion of that function on all CPUs. + * + * Returns 0 if successful, -ETIMEDOUT if we were asked to wait, but hit the + * timeout. + */ +int smp_nmi_call_function(smp_call_func_t func, void *info, int wait) +{ + struct nmi_call_data_struct data; + unsigned long flags; + unsigned int cnt; + int cpus, ret = 0; + + cpus = num_online_cpus() - 1; + if (cpus < 1) + return 0; + + data.func = func; + data.info = info; + data.started = cpu_online_map; + cpu_clear(smp_processor_id(), data.started); + data.wait = wait; + if (wait) + data.finished = data.started; + + spin_lock_irqsave(&smp_nmi_call_lock, flags); + nmi_call_data = &data; + smp_mb(); + + /* Send a message to all other CPUs and wait for them to respond */ + send_IPI_allbutself(CALL_FUNCTION_NMI_IPI); + + /* Wait for response */ + if (CALL_FUNCTION_NMI_IPI_TIMEOUT > 0) { + for (cnt = 0; + cnt < CALL_FUNCTION_NMI_IPI_TIMEOUT && + !cpus_empty(data.started); + cnt++) + mdelay(1); + + if (wait && cnt < CALL_FUNCTION_NMI_IPI_TIMEOUT) { + for (cnt = 0; + cnt < CALL_FUNCTION_NMI_IPI_TIMEOUT && + !cpus_empty(data.finished); + cnt++) + mdelay(1); + } + + if (cnt >= CALL_FUNCTION_NMI_IPI_TIMEOUT) + ret = -ETIMEDOUT; + + } else { + /* If timeout value is zero, wait until cpumask has been + * cleared */ + while (!cpus_empty(data.started)) + barrier(); + if (wait) + while (!cpus_empty(data.finished)) + barrier(); + } + + spin_unlock_irqrestore(&smp_nmi_call_lock, flags); + return ret; +} + +/** + * stop_this_cpu - Callback to stop a CPU. + * @unused: Callback context (ignored). + */ +void stop_this_cpu(void *unused) +{ + static volatile int stopflag; + unsigned long flags; + +#ifdef CONFIG_GDBSTUB + /* In case of single stepping smp_send_stop by other CPU, + * clear procindebug to avoid deadlock. + */ + atomic_set(&procindebug[smp_processor_id()], 0); +#endif /* CONFIG_GDBSTUB */ + + flags = arch_local_cli_save(); + cpu_clear(smp_processor_id(), cpu_online_map); + + while (!stopflag) + cpu_relax(); + + cpu_set(smp_processor_id(), cpu_online_map); + arch_local_irq_restore(flags); +} + +/** + * smp_send_stop - Send a stop request to all CPUs. + */ +void smp_send_stop(void) +{ + smp_nmi_call_function(stop_this_cpu, NULL, 0); +} + +/** + * smp_reschedule_interrupt - Reschedule IPI handler + * @irq: The interrupt number. + * @dev_id: The device ID. + * + * We need do nothing here, since the scheduling will be effected on our way + * back through entry.S. + * + * Returns IRQ_HANDLED to indicate we handled the interrupt successfully. + */ +static irqreturn_t smp_reschedule_interrupt(int irq, void *dev_id) +{ + /* do nothing */ + return IRQ_HANDLED; +} + +/** + * smp_call_function_interrupt - Call function IPI handler + * @irq: The interrupt number. + * @dev_id: The device ID. + * + * Returns IRQ_HANDLED to indicate we handled the interrupt successfully. + */ +static irqreturn_t smp_call_function_interrupt(int irq, void *dev_id) +{ + /* generic_smp_call_function_interrupt(); */ + generic_smp_call_function_single_interrupt(); + return IRQ_HANDLED; +} + +/** + * smp_nmi_call_function_interrupt - Non-maskable call function IPI handler + */ +void smp_nmi_call_function_interrupt(void) +{ + smp_call_func_t func = nmi_call_data->func; + void *info = nmi_call_data->info; + int wait = nmi_call_data->wait; + + /* Notify the initiating CPU that I've grabbed the data and am about to + * execute the function + */ + smp_mb(); + cpu_clear(smp_processor_id(), nmi_call_data->started); + (*func)(info); + + if (wait) { + smp_mb(); + cpu_clear(smp_processor_id(), nmi_call_data->finished); + } +} + +/** + * smp_ipi_timer_interrupt - Local timer IPI handler + * @irq: The interrupt number. + * @dev_id: The device ID. + * + * Returns IRQ_HANDLED to indicate we handled the interrupt successfully. + */ +static irqreturn_t smp_ipi_timer_interrupt(int irq, void *dev_id) +{ + return local_timer_interrupt(); +} + +void __init smp_init_cpus(void) +{ + int i; + for (i = 0; i < NR_CPUS; i++) { + set_cpu_possible(i, true); + set_cpu_present(i, true); + } +} + +/** + * smp_cpu_init - Initialise AP in start_secondary. + * + * For this Application Processor, set up init_mm, initialise FPU and set + * interrupt level 0-6 setting. + */ +static void __init smp_cpu_init(void) +{ + unsigned long flags; + int cpu_id = smp_processor_id(); + u16 tmp16; + + if (test_and_set_bit(cpu_id, &cpu_initialized)) { + printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id); + for (;;) + local_irq_enable(); + } + printk(KERN_INFO "Initializing CPU#%d\n", cpu_id); + + atomic_inc(&init_mm.mm_count); + current->active_mm = &init_mm; + BUG_ON(current->mm); + + enter_lazy_tlb(&init_mm, current); + + /* Force FPU initialization */ + clear_using_fpu(current); + + GxICR(CALL_FUNC_SINGLE_IPI) = CALL_FUNCTION_GxICR_LV | GxICR_DETECT; + mn10300_ipi_enable(CALL_FUNC_SINGLE_IPI); + + GxICR(LOCAL_TIMER_IPI) = LOCAL_TIMER_GxICR_LV | GxICR_DETECT; + mn10300_ipi_enable(LOCAL_TIMER_IPI); + + GxICR(RESCHEDULE_IPI) = RESCHEDULE_GxICR_LV | GxICR_DETECT; + mn10300_ipi_enable(RESCHEDULE_IPI); + +#ifdef CONFIG_MN10300_CACHE_ENABLED + GxICR(FLUSH_CACHE_IPI) = FLUSH_CACHE_GxICR_LV | GxICR_DETECT; + mn10300_ipi_enable(FLUSH_CACHE_IPI); +#endif + + mn10300_ipi_shutdown(SMP_BOOT_IRQ); + + /* Set up the non-maskable call function IPI */ + flags = arch_local_cli_save(); + GxICR(CALL_FUNCTION_NMI_IPI) = GxICR_NMI | GxICR_ENABLE | GxICR_DETECT; + tmp16 = GxICR(CALL_FUNCTION_NMI_IPI); + arch_local_irq_restore(flags); +} + +/** + * smp_prepare_cpu_init - Initialise CPU in startup_secondary + * + * Set interrupt level 0-6 setting and init ICR of gdbstub. + */ +void smp_prepare_cpu_init(void) +{ + int loop; + + /* Set the interrupt vector registers */ + IVAR0 = EXCEP_IRQ_LEVEL0; + IVAR1 = EXCEP_IRQ_LEVEL1; + IVAR2 = EXCEP_IRQ_LEVEL2; + IVAR3 = EXCEP_IRQ_LEVEL3; + IVAR4 = EXCEP_IRQ_LEVEL4; + IVAR5 = EXCEP_IRQ_LEVEL5; + IVAR6 = EXCEP_IRQ_LEVEL6; + + /* Disable all interrupts and set to priority 6 (lowest) */ + for (loop = 0; loop < GxICR_NUM_IRQS; loop++) + GxICR(loop) = GxICR_LEVEL_6 | GxICR_DETECT; + +#ifdef CONFIG_GDBSTUB + /* initialise GDB-stub */ + do { + unsigned long flags; + u16 tmp16; + + flags = arch_local_cli_save(); + GxICR(GDB_NMI_IPI) = GxICR_NMI | GxICR_ENABLE | GxICR_DETECT; + tmp16 = GxICR(GDB_NMI_IPI); + arch_local_irq_restore(flags); + } while (0); +#endif +} + +/** + * start_secondary - Activate a secondary CPU (AP) + * @unused: Thread parameter (ignored). + */ +int __init start_secondary(void *unused) +{ + smp_cpu_init(); + + smp_callin(); + while (!cpu_isset(smp_processor_id(), smp_commenced_mask)) + cpu_relax(); + + local_flush_tlb(); + preempt_disable(); + smp_online(); + + cpu_idle(); + return 0; +} + +/** + * smp_prepare_cpus - Boot up secondary CPUs (APs) + * @max_cpus: Maximum number of CPUs to boot. + * + * Call do_boot_cpu, and boot up APs. + */ +void __init smp_prepare_cpus(unsigned int max_cpus) +{ + int phy_id; + + /* Setup boot CPU information */ + smp_store_cpu_info(0); + smp_tune_scheduling(); + + init_ipi(); + + /* If SMP should be disabled, then finish */ + if (max_cpus == 0) { + printk(KERN_INFO "SMP mode deactivated.\n"); + goto smp_done; + } + + /* Boot secondary CPUs (for which phy_id > 0) */ + for (phy_id = 0; phy_id < NR_CPUS; phy_id++) { + /* Don't boot primary CPU */ + if (max_cpus <= cpucount + 1) + continue; + if (phy_id != 0) + do_boot_cpu(phy_id); + set_cpu_possible(phy_id, true); + smp_show_cpu_info(phy_id); + } + +smp_done: + Dprintk("Boot done.\n"); +} + +/** + * smp_store_cpu_info - Save a CPU's information + * @cpu: The CPU to save for. + * + * Save boot_cpu_data and jiffy for the specified CPU. + */ +static void __init smp_store_cpu_info(int cpu) +{ + struct mn10300_cpuinfo *ci = &cpu_data[cpu]; + + *ci = boot_cpu_data; + ci->loops_per_jiffy = loops_per_jiffy; + ci->type = CPUREV; +} + +/** + * smp_tune_scheduling - Set time slice value + * + * Nothing to do here. + */ +static void __init smp_tune_scheduling(void) +{ +} + +/** + * do_boot_cpu: Boot up one CPU + * @phy_id: Physical ID of CPU to boot. + * + * Send an IPI to a secondary CPU to boot it. Returns 0 on success, 1 + * otherwise. + */ +static int __init do_boot_cpu(int phy_id) +{ + struct task_struct *idle; + unsigned long send_status, callin_status; + int timeout, cpu_id; + + send_status = GxICR_REQUEST; + callin_status = 0; + timeout = 0; + cpu_id = phy_id; + + cpucount++; + + /* Create idle thread for this CPU */ + idle = fork_idle(cpu_id); + if (IS_ERR(idle)) + panic("Failed fork for CPU#%d.", cpu_id); + + idle->thread.pc = (unsigned long)start_secondary; + + printk(KERN_NOTICE "Booting CPU#%d\n", cpu_id); + start_stack[cpu_id - 1] = idle->thread.sp; + + task_thread_info(idle)->cpu = cpu_id; + + /* Send boot IPI to AP */ + send_IPI_mask(cpumask_of(phy_id), SMP_BOOT_IRQ); + + Dprintk("Waiting for send to finish...\n"); + + /* Wait for AP's IPI receive in 100[ms] */ + do { + udelay(1000); + send_status = + CROSS_GxICR(SMP_BOOT_IRQ, phy_id) & GxICR_REQUEST; + } while (send_status == GxICR_REQUEST && timeout++ < 100); + + Dprintk("Waiting for cpu_callin_map.\n"); + + if (send_status == 0) { + /* Allow AP to start initializing */ + cpu_set(cpu_id, cpu_callout_map); + + /* Wait for setting cpu_callin_map */ + timeout = 0; + do { + udelay(1000); + callin_status = cpu_isset(cpu_id, cpu_callin_map); + } while (callin_status == 0 && timeout++ < 5000); + + if (callin_status == 0) + Dprintk("Not responding.\n"); + } else { + printk(KERN_WARNING "IPI not delivered.\n"); + } + + if (send_status == GxICR_REQUEST || callin_status == 0) { + cpu_clear(cpu_id, cpu_callout_map); + cpu_clear(cpu_id, cpu_callin_map); + cpu_clear(cpu_id, cpu_initialized); + cpucount--; + return 1; + } + return 0; +} + +/** + * smp_show_cpu_info - Show SMP CPU information + * @cpu: The CPU of interest. + */ +static void __init smp_show_cpu_info(int cpu) +{ + struct mn10300_cpuinfo *ci = &cpu_data[cpu]; + + printk(KERN_INFO + "CPU#%d : ioclk speed: %lu.%02luMHz : bogomips : %lu.%02lu\n", + cpu, + MN10300_IOCLK / 1000000, + (MN10300_IOCLK / 10000) % 100, + ci->loops_per_jiffy / (500000 / HZ), + (ci->loops_per_jiffy / (5000 / HZ)) % 100); +} + +/** + * smp_callin - Set cpu_callin_map of the current CPU ID + */ +static void __init smp_callin(void) +{ + unsigned long timeout; + int cpu; + + cpu = smp_processor_id(); + timeout = jiffies + (2 * HZ); + + if (cpu_isset(cpu, cpu_callin_map)) { + printk(KERN_ERR "CPU#%d already present.\n", cpu); + BUG(); + } + Dprintk("CPU#%d waiting for CALLOUT\n", cpu); + + /* Wait for AP startup 2s total */ + while (time_before(jiffies, timeout)) { + if (cpu_isset(cpu, cpu_callout_map)) + break; + cpu_relax(); + } + + if (!time_before(jiffies, timeout)) { + printk(KERN_ERR + "BUG: CPU#%d started up but did not get a callout!\n", + cpu); + BUG(); + } + +#ifdef CONFIG_CALIBRATE_DELAY + calibrate_delay(); /* Get our bogomips */ +#endif + + /* Save our processor parameters */ + smp_store_cpu_info(cpu); + + /* Allow the boot processor to continue */ + cpu_set(cpu, cpu_callin_map); +} + +/** + * smp_online - Set cpu_online_map + */ +static void __init smp_online(void) +{ + int cpu; + + cpu = smp_processor_id(); + + local_irq_enable(); + + cpu_set(cpu, cpu_online_map); + smp_wmb(); +} + +/** + * smp_cpus_done - + * @max_cpus: Maximum CPU count. + * + * Do nothing. + */ +void __init smp_cpus_done(unsigned int max_cpus) +{ +} + +/* + * smp_prepare_boot_cpu - Set up stuff for the boot processor. + * + * Set up the cpu_online_map, cpu_callout_map and cpu_callin_map of the boot + * processor (CPU 0). + */ +void __devinit smp_prepare_boot_cpu(void) +{ + cpu_set(0, cpu_callout_map); + cpu_set(0, cpu_callin_map); + current_thread_info()->cpu = 0; +} + +/* + * initialize_secondary - Initialise a secondary CPU (Application Processor). + * + * Set SP register and jump to thread's PC address. + */ +void initialize_secondary(void) +{ + asm volatile ( + "mov %0,sp \n" + "jmp (%1) \n" + : + : "a"(current->thread.sp), "a"(current->thread.pc)); +} + +/** + * __cpu_up - Set smp_commenced_mask for the nominated CPU + * @cpu: The target CPU. + */ +int __devinit __cpu_up(unsigned int cpu) +{ + int timeout; + +#ifdef CONFIG_HOTPLUG_CPU + if (num_online_cpus() == 1) + disable_hlt(); + if (sleep_mode[cpu]) + run_wakeup_cpu(cpu); +#endif /* CONFIG_HOTPLUG_CPU */ + + cpu_set(cpu, smp_commenced_mask); + + /* Wait 5s total for a response */ + for (timeout = 0 ; timeout < 5000 ; timeout++) { + if (cpu_isset(cpu, cpu_online_map)) + break; + udelay(1000); + } + + BUG_ON(!cpu_isset(cpu, cpu_online_map)); + return 0; +} + +/** + * setup_profiling_timer - Set up the profiling timer + * @multiplier - The frequency multiplier to use + * + * The frequency of the profiling timer can be changed by writing a multiplier + * value into /proc/profile. + */ +int setup_profiling_timer(unsigned int multiplier) +{ + return -EINVAL; +} + +/* + * CPU hotplug routines + */ +#ifdef CONFIG_HOTPLUG_CPU + +static DEFINE_PER_CPU(struct cpu, cpu_devices); + +static int __init topology_init(void) +{ + int cpu, ret; + + for_each_cpu(cpu) { + ret = register_cpu(&per_cpu(cpu_devices, cpu), cpu, NULL); + if (ret) + printk(KERN_WARNING + "topology_init: register_cpu %d failed (%d)\n", + cpu, ret); + } + return 0; +} + +subsys_initcall(topology_init); + +int __cpu_disable(void) +{ + int cpu = smp_processor_id(); + if (cpu == 0) + return -EBUSY; + + migrate_irqs(); + cpu_clear(cpu, current->active_mm->cpu_vm_mask); + return 0; +} + +void __cpu_die(unsigned int cpu) +{ + run_sleep_cpu(cpu); + + if (num_online_cpus() == 1) + enable_hlt(); +} + +#ifdef CONFIG_MN10300_CACHE_ENABLED +static inline void hotplug_cpu_disable_cache(void) +{ + int tmp; + asm volatile( + " movhu (%1),%0 \n" + " and %2,%0 \n" + " movhu %0,(%1) \n" + "1: movhu (%1),%0 \n" + " btst %3,%0 \n" + " bne 1b \n" + : "=&r"(tmp) + : "a"(&CHCTR), + "i"(~(CHCTR_ICEN | CHCTR_DCEN)), + "i"(CHCTR_ICBUSY | CHCTR_DCBUSY) + : "memory", "cc"); +} + +static inline void hotplug_cpu_enable_cache(void) +{ + int tmp; + asm volatile( + "movhu (%1),%0 \n" + "or %2,%0 \n" + "movhu %0,(%1) \n" + : "=&r"(tmp) + : "a"(&CHCTR), + "i"(CHCTR_ICEN | CHCTR_DCEN) + : "memory", "cc"); +} + +static inline void hotplug_cpu_invalidate_cache(void) +{ + int tmp; + asm volatile ( + "movhu (%1),%0 \n" + "or %2,%0 \n" + "movhu %0,(%1) \n" + : "=&r"(tmp) + : "a"(&CHCTR), + "i"(CHCTR_ICINV | CHCTR_DCINV) + : "cc"); +} + +#else /* CONFIG_MN10300_CACHE_ENABLED */ +#define hotplug_cpu_disable_cache() do {} while (0) +#define hotplug_cpu_enable_cache() do {} while (0) +#define hotplug_cpu_invalidate_cache() do {} while (0) +#endif /* CONFIG_MN10300_CACHE_ENABLED */ + +/** + * hotplug_cpu_nmi_call_function - Call a function on other CPUs for hotplug + * @cpumask: List of target CPUs. + * @func: The function to call on those CPUs. + * @info: The context data for the function to be called. + * @wait: Whether to wait for the calls to complete. + * + * Non-maskably call a function on another CPU for hotplug purposes. + * + * This function must be called with maskable interrupts disabled. + */ +static int hotplug_cpu_nmi_call_function(cpumask_t cpumask, + smp_call_func_t func, void *info, + int wait) +{ + /* + * The address and the size of nmi_call_func_mask_data + * need to be aligned on L1_CACHE_BYTES. + */ + static struct nmi_call_data_struct nmi_call_func_mask_data + __cacheline_aligned; + unsigned long start, end; + + start = (unsigned long)&nmi_call_func_mask_data; + end = start + sizeof(struct nmi_call_data_struct); + + nmi_call_func_mask_data.func = func; + nmi_call_func_mask_data.info = info; + nmi_call_func_mask_data.started = cpumask; + nmi_call_func_mask_data.wait = wait; + if (wait) + nmi_call_func_mask_data.finished = cpumask; + + spin_lock(&smp_nmi_call_lock); + nmi_call_data = &nmi_call_func_mask_data; + mn10300_local_dcache_flush_range(start, end); + smp_wmb(); + + send_IPI_mask(cpumask, CALL_FUNCTION_NMI_IPI); + + do { + mn10300_local_dcache_inv_range(start, end); + barrier(); + } while (!cpus_empty(nmi_call_func_mask_data.started)); + + if (wait) { + do { + mn10300_local_dcache_inv_range(start, end); + barrier(); + } while (!cpus_empty(nmi_call_func_mask_data.finished)); + } + + spin_unlock(&smp_nmi_call_lock); + return 0; +} + +static void restart_wakeup_cpu(void) +{ + unsigned int cpu = smp_processor_id(); + + cpu_set(cpu, cpu_callin_map); + local_flush_tlb(); + cpu_set(cpu, cpu_online_map); + smp_wmb(); +} + +static void prepare_sleep_cpu(void *unused) +{ + sleep_mode[smp_processor_id()] = 1; + smp_mb(); + mn10300_local_dcache_flush_inv(); + hotplug_cpu_disable_cache(); + hotplug_cpu_invalidate_cache(); +} + +/* when this function called, IE=0, NMID=0. */ +static void sleep_cpu(void *unused) +{ + unsigned int cpu_id = smp_processor_id(); + /* + * CALL_FUNCTION_NMI_IPI for wakeup_cpu() shall not be requested, + * before this cpu goes in SLEEP mode. + */ + do { + smp_mb(); + __sleep_cpu(); + } while (sleep_mode[cpu_id]); + restart_wakeup_cpu(); +} + +static void run_sleep_cpu(unsigned int cpu) +{ + unsigned long flags; + cpumask_t cpumask = cpumask_of(cpu); + + flags = arch_local_cli_save(); + hotplug_cpu_nmi_call_function(cpumask, prepare_sleep_cpu, NULL, 1); + hotplug_cpu_nmi_call_function(cpumask, sleep_cpu, NULL, 0); + udelay(1); /* delay for the cpu to sleep. */ + arch_local_irq_restore(flags); +} + +static void wakeup_cpu(void) +{ + hotplug_cpu_invalidate_cache(); + hotplug_cpu_enable_cache(); + smp_mb(); + sleep_mode[smp_processor_id()] = 0; +} + +static void run_wakeup_cpu(unsigned int cpu) +{ + unsigned long flags; + + flags = arch_local_cli_save(); +#if NR_CPUS == 2 + mn10300_local_dcache_flush_inv(); +#else + /* + * Before waking up the cpu, + * all online cpus should stop and flush D-Cache for global data. + */ +#error not support NR_CPUS > 2, when CONFIG_HOTPLUG_CPU=y. +#endif + hotplug_cpu_nmi_call_function(cpumask_of(cpu), wakeup_cpu, NULL, 1); + arch_local_irq_restore(flags); +} + +#endif /* CONFIG_HOTPLUG_CPU */ |
