diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/alpha/kernel/smp.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/alpha/kernel/smp.c | 825 |
1 files changed, 0 insertions, 825 deletions
diff --git a/ANDROID_3.4.5/arch/alpha/kernel/smp.c b/ANDROID_3.4.5/arch/alpha/kernel/smp.c deleted file mode 100644 index 50d438db..00000000 --- a/ANDROID_3.4.5/arch/alpha/kernel/smp.c +++ /dev/null @@ -1,825 +0,0 @@ -/* - * linux/arch/alpha/kernel/smp.c - * - * 2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com) - * Renamed modified smp_call_function to smp_call_function_on_cpu() - * Created an function that conforms to the old calling convention - * of smp_call_function(). - * - * This is helpful for DCPI. - * - */ - -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/kernel_stat.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/err.h> -#include <linux/threads.h> -#include <linux/smp.h> -#include <linux/interrupt.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/spinlock.h> -#include <linux/irq.h> -#include <linux/cache.h> -#include <linux/profile.h> -#include <linux/bitops.h> -#include <linux/cpu.h> - -#include <asm/hwrpb.h> -#include <asm/ptrace.h> -#include <linux/atomic.h> - -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/mmu_context.h> -#include <asm/tlbflush.h> - -#include "proto.h" -#include "irq_impl.h" - - -#define DEBUG_SMP 0 -#if DEBUG_SMP -#define DBGS(args) printk args -#else -#define DBGS(args) -#endif - -/* A collection of per-processor data. */ -struct cpuinfo_alpha cpu_data[NR_CPUS]; -EXPORT_SYMBOL(cpu_data); - -/* A collection of single bit ipi messages. */ -static struct { - unsigned long bits ____cacheline_aligned; -} ipi_data[NR_CPUS] __cacheline_aligned; - -enum ipi_message_type { - IPI_RESCHEDULE, - IPI_CALL_FUNC, - IPI_CALL_FUNC_SINGLE, - IPI_CPU_STOP, -}; - -/* Set to a secondary's cpuid when it comes online. */ -static int smp_secondary_alive __devinitdata = 0; - -int smp_num_probed; /* Internal processor count */ -int smp_num_cpus = 1; /* Number that came online. */ -EXPORT_SYMBOL(smp_num_cpus); - -/* - * Called by both boot and secondaries to move global data into - * per-processor storage. - */ -static inline void __init -smp_store_cpu_info(int cpuid) -{ - cpu_data[cpuid].loops_per_jiffy = loops_per_jiffy; - cpu_data[cpuid].last_asn = ASN_FIRST_VERSION; - cpu_data[cpuid].need_new_asn = 0; - cpu_data[cpuid].asn_lock = 0; -} - -/* - * Ideally sets up per-cpu profiling hooks. Doesn't do much now... - */ -static inline void __init -smp_setup_percpu_timer(int cpuid) -{ - cpu_data[cpuid].prof_counter = 1; - cpu_data[cpuid].prof_multiplier = 1; -} - -static void __init -wait_boot_cpu_to_stop(int cpuid) -{ - unsigned long stop = jiffies + 10*HZ; - - while (time_before(jiffies, stop)) { - if (!smp_secondary_alive) - return; - barrier(); - } - - printk("wait_boot_cpu_to_stop: FAILED on CPU %d, hanging now\n", cpuid); - for (;;) - barrier(); -} - -/* - * Where secondaries begin a life of C. - */ -void __cpuinit -smp_callin(void) -{ - int cpuid = hard_smp_processor_id(); - - if (cpu_online(cpuid)) { - printk("??, cpu 0x%x already present??\n", cpuid); - BUG(); - } - set_cpu_online(cpuid, true); - - /* Turn on machine checks. */ - wrmces(7); - - /* Set trap vectors. */ - trap_init(); - - /* Set interrupt vector. */ - wrent(entInt, 0); - - /* Get our local ticker going. */ - smp_setup_percpu_timer(cpuid); - - /* Call platform-specific callin, if specified */ - if (alpha_mv.smp_callin) alpha_mv.smp_callin(); - - /* All kernel threads share the same mm context. */ - atomic_inc(&init_mm.mm_count); - current->active_mm = &init_mm; - - /* inform the notifiers about the new cpu */ - notify_cpu_starting(cpuid); - - /* Must have completely accurate bogos. */ - local_irq_enable(); - - /* Wait boot CPU to stop with irq enabled before running - calibrate_delay. */ - wait_boot_cpu_to_stop(cpuid); - mb(); - calibrate_delay(); - - smp_store_cpu_info(cpuid); - /* Allow master to continue only after we written loops_per_jiffy. */ - wmb(); - smp_secondary_alive = 1; - - DBGS(("smp_callin: commencing CPU %d current %p active_mm %p\n", - cpuid, current, current->active_mm)); - - /* Do nothing. */ - cpu_idle(); -} - -/* Wait until hwrpb->txrdy is clear for cpu. Return -1 on timeout. */ -static int __devinit -wait_for_txrdy (unsigned long cpumask) -{ - unsigned long timeout; - - if (!(hwrpb->txrdy & cpumask)) - return 0; - - timeout = jiffies + 10*HZ; - while (time_before(jiffies, timeout)) { - if (!(hwrpb->txrdy & cpumask)) - return 0; - udelay(10); - barrier(); - } - - return -1; -} - -/* - * Send a message to a secondary's console. "START" is one such - * interesting message. ;-) - */ -static void __cpuinit -send_secondary_console_msg(char *str, int cpuid) -{ - struct percpu_struct *cpu; - register char *cp1, *cp2; - unsigned long cpumask; - size_t len; - - cpu = (struct percpu_struct *) - ((char*)hwrpb - + hwrpb->processor_offset - + cpuid * hwrpb->processor_size); - - cpumask = (1UL << cpuid); - if (wait_for_txrdy(cpumask)) - goto timeout; - - cp2 = str; - len = strlen(cp2); - *(unsigned int *)&cpu->ipc_buffer[0] = len; - cp1 = (char *) &cpu->ipc_buffer[1]; - memcpy(cp1, cp2, len); - - /* atomic test and set */ - wmb(); - set_bit(cpuid, &hwrpb->rxrdy); - - if (wait_for_txrdy(cpumask)) - goto timeout; - return; - - timeout: - printk("Processor %x not ready\n", cpuid); -} - -/* - * A secondary console wants to send a message. Receive it. - */ -static void -recv_secondary_console_msg(void) -{ - int mycpu, i, cnt; - unsigned long txrdy = hwrpb->txrdy; - char *cp1, *cp2, buf[80]; - struct percpu_struct *cpu; - - DBGS(("recv_secondary_console_msg: TXRDY 0x%lx.\n", txrdy)); - - mycpu = hard_smp_processor_id(); - - for (i = 0; i < NR_CPUS; i++) { - if (!(txrdy & (1UL << i))) - continue; - - DBGS(("recv_secondary_console_msg: " - "TXRDY contains CPU %d.\n", i)); - - cpu = (struct percpu_struct *) - ((char*)hwrpb - + hwrpb->processor_offset - + i * hwrpb->processor_size); - - DBGS(("recv_secondary_console_msg: on %d from %d" - " HALT_REASON 0x%lx FLAGS 0x%lx\n", - mycpu, i, cpu->halt_reason, cpu->flags)); - - cnt = cpu->ipc_buffer[0] >> 32; - if (cnt <= 0 || cnt >= 80) - strcpy(buf, "<<< BOGUS MSG >>>"); - else { - cp1 = (char *) &cpu->ipc_buffer[11]; - cp2 = buf; - strcpy(cp2, cp1); - - while ((cp2 = strchr(cp2, '\r')) != 0) { - *cp2 = ' '; - if (cp2[1] == '\n') - cp2[1] = ' '; - } - } - - DBGS((KERN_INFO "recv_secondary_console_msg: on %d " - "message is '%s'\n", mycpu, buf)); - } - - hwrpb->txrdy = 0; -} - -/* - * Convince the console to have a secondary cpu begin execution. - */ -static int __cpuinit -secondary_cpu_start(int cpuid, struct task_struct *idle) -{ - struct percpu_struct *cpu; - struct pcb_struct *hwpcb, *ipcb; - unsigned long timeout; - - cpu = (struct percpu_struct *) - ((char*)hwrpb - + hwrpb->processor_offset - + cpuid * hwrpb->processor_size); - hwpcb = (struct pcb_struct *) cpu->hwpcb; - ipcb = &task_thread_info(idle)->pcb; - - /* Initialize the CPU's HWPCB to something just good enough for - us to get started. Immediately after starting, we'll swpctx - to the target idle task's pcb. Reuse the stack in the mean - time. Precalculate the target PCBB. */ - hwpcb->ksp = (unsigned long)ipcb + sizeof(union thread_union) - 16; - hwpcb->usp = 0; - hwpcb->ptbr = ipcb->ptbr; - hwpcb->pcc = 0; - hwpcb->asn = 0; - hwpcb->unique = virt_to_phys(ipcb); - hwpcb->flags = ipcb->flags; - hwpcb->res1 = hwpcb->res2 = 0; - -#if 0 - DBGS(("KSP 0x%lx PTBR 0x%lx VPTBR 0x%lx UNIQUE 0x%lx\n", - hwpcb->ksp, hwpcb->ptbr, hwrpb->vptb, hwpcb->unique)); -#endif - DBGS(("Starting secondary cpu %d: state 0x%lx pal_flags 0x%lx\n", - cpuid, idle->state, ipcb->flags)); - - /* Setup HWRPB fields that SRM uses to activate secondary CPU */ - hwrpb->CPU_restart = __smp_callin; - hwrpb->CPU_restart_data = (unsigned long) __smp_callin; - - /* Recalculate and update the HWRPB checksum */ - hwrpb_update_checksum(hwrpb); - - /* - * Send a "start" command to the specified processor. - */ - - /* SRM III 3.4.1.3 */ - cpu->flags |= 0x22; /* turn on Context Valid and Restart Capable */ - cpu->flags &= ~1; /* turn off Bootstrap In Progress */ - wmb(); - - send_secondary_console_msg("START\r\n", cpuid); - - /* Wait 10 seconds for an ACK from the console. */ - timeout = jiffies + 10*HZ; - while (time_before(jiffies, timeout)) { - if (cpu->flags & 1) - goto started; - udelay(10); - barrier(); - } - printk(KERN_ERR "SMP: Processor %d failed to start.\n", cpuid); - return -1; - - started: - DBGS(("secondary_cpu_start: SUCCESS for CPU %d!!!\n", cpuid)); - return 0; -} - -/* - * Bring one cpu online. - */ -static int __cpuinit -smp_boot_one_cpu(int cpuid) -{ - struct task_struct *idle; - unsigned long timeout; - - /* Cook up an idler for this guy. Note that the address we - give to kernel_thread is irrelevant -- it's going to start - where HWRPB.CPU_restart says to start. But this gets all - the other task-y sort of data structures set up like we - wish. We can't use kernel_thread since we must avoid - rescheduling the child. */ - idle = fork_idle(cpuid); - if (IS_ERR(idle)) - panic("failed fork for CPU %d", cpuid); - - DBGS(("smp_boot_one_cpu: CPU %d state 0x%lx flags 0x%lx\n", - cpuid, idle->state, idle->flags)); - - /* Signal the secondary to wait a moment. */ - smp_secondary_alive = -1; - - /* Whirrr, whirrr, whirrrrrrrrr... */ - if (secondary_cpu_start(cpuid, idle)) - return -1; - - /* Notify the secondary CPU it can run calibrate_delay. */ - mb(); - smp_secondary_alive = 0; - - /* We've been acked by the console; wait one second for - the task to start up for real. */ - timeout = jiffies + 1*HZ; - while (time_before(jiffies, timeout)) { - if (smp_secondary_alive == 1) - goto alive; - udelay(10); - barrier(); - } - - /* We failed to boot the CPU. */ - - printk(KERN_ERR "SMP: Processor %d is stuck.\n", cpuid); - return -1; - - alive: - /* Another "Red Snapper". */ - return 0; -} - -/* - * Called from setup_arch. Detect an SMP system and which processors - * are present. - */ -void __init -setup_smp(void) -{ - struct percpu_struct *cpubase, *cpu; - unsigned long i; - - if (boot_cpuid != 0) { - printk(KERN_WARNING "SMP: Booting off cpu %d instead of 0?\n", - boot_cpuid); - } - - if (hwrpb->nr_processors > 1) { - int boot_cpu_palrev; - - DBGS(("setup_smp: nr_processors %ld\n", - hwrpb->nr_processors)); - - cpubase = (struct percpu_struct *) - ((char*)hwrpb + hwrpb->processor_offset); - boot_cpu_palrev = cpubase->pal_revision; - - for (i = 0; i < hwrpb->nr_processors; i++) { - cpu = (struct percpu_struct *) - ((char *)cpubase + i*hwrpb->processor_size); - if ((cpu->flags & 0x1cc) == 0x1cc) { - smp_num_probed++; - set_cpu_possible(i, true); - set_cpu_present(i, true); - cpu->pal_revision = boot_cpu_palrev; - } - - DBGS(("setup_smp: CPU %d: flags 0x%lx type 0x%lx\n", - i, cpu->flags, cpu->type)); - DBGS(("setup_smp: CPU %d: PAL rev 0x%lx\n", - i, cpu->pal_revision)); - } - } else { - smp_num_probed = 1; - } - - printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_mask = %lx\n", - smp_num_probed, cpumask_bits(cpu_present_mask)[0]); -} - -/* - * Called by smp_init prepare the secondaries - */ -void __init -smp_prepare_cpus(unsigned int max_cpus) -{ - /* Take care of some initial bookkeeping. */ - memset(ipi_data, 0, sizeof(ipi_data)); - - current_thread_info()->cpu = boot_cpuid; - - smp_store_cpu_info(boot_cpuid); - smp_setup_percpu_timer(boot_cpuid); - - /* Nothing to do on a UP box, or when told not to. */ - if (smp_num_probed == 1 || max_cpus == 0) { - init_cpu_possible(cpumask_of(boot_cpuid)); - init_cpu_present(cpumask_of(boot_cpuid)); - printk(KERN_INFO "SMP mode deactivated.\n"); - return; - } - - printk(KERN_INFO "SMP starting up secondaries.\n"); - - smp_num_cpus = smp_num_probed; -} - -void __devinit -smp_prepare_boot_cpu(void) -{ -} - -int __cpuinit -__cpu_up(unsigned int cpu) -{ - smp_boot_one_cpu(cpu); - - return cpu_online(cpu) ? 0 : -ENOSYS; -} - -void __init -smp_cpus_done(unsigned int max_cpus) -{ - int cpu; - unsigned long bogosum = 0; - - for(cpu = 0; cpu < NR_CPUS; cpu++) - if (cpu_online(cpu)) - bogosum += cpu_data[cpu].loops_per_jiffy; - - printk(KERN_INFO "SMP: Total of %d processors activated " - "(%lu.%02lu BogoMIPS).\n", - num_online_cpus(), - (bogosum + 2500) / (500000/HZ), - ((bogosum + 2500) / (5000/HZ)) % 100); -} - - -void -smp_percpu_timer_interrupt(struct pt_regs *regs) -{ - struct pt_regs *old_regs; - int cpu = smp_processor_id(); - unsigned long user = user_mode(regs); - struct cpuinfo_alpha *data = &cpu_data[cpu]; - - old_regs = set_irq_regs(regs); - - /* Record kernel PC. */ - profile_tick(CPU_PROFILING); - - if (!--data->prof_counter) { - /* We need to make like a normal interrupt -- otherwise - timer interrupts ignore the global interrupt lock, - which would be a Bad Thing. */ - irq_enter(); - - update_process_times(user); - - data->prof_counter = data->prof_multiplier; - - irq_exit(); - } - set_irq_regs(old_regs); -} - -int -setup_profiling_timer(unsigned int multiplier) -{ - return -EINVAL; -} - - -static void -send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation) -{ - int i; - - mb(); - for_each_cpu(i, to_whom) - set_bit(operation, &ipi_data[i].bits); - - mb(); - for_each_cpu(i, to_whom) - wripir(i); -} - -void -handle_ipi(struct pt_regs *regs) -{ - int this_cpu = smp_processor_id(); - unsigned long *pending_ipis = &ipi_data[this_cpu].bits; - unsigned long ops; - -#if 0 - DBGS(("handle_ipi: on CPU %d ops 0x%lx PC 0x%lx\n", - this_cpu, *pending_ipis, regs->pc)); -#endif - - mb(); /* Order interrupt and bit testing. */ - while ((ops = xchg(pending_ipis, 0)) != 0) { - mb(); /* Order bit clearing and data access. */ - do { - unsigned long which; - - which = ops & -ops; - ops &= ~which; - which = __ffs(which); - - switch (which) { - case IPI_RESCHEDULE: - scheduler_ipi(); - break; - - case IPI_CALL_FUNC: - generic_smp_call_function_interrupt(); - break; - - case IPI_CALL_FUNC_SINGLE: - generic_smp_call_function_single_interrupt(); - break; - - case IPI_CPU_STOP: - halt(); - - default: - printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n", - this_cpu, which); - break; - } - } while (ops); - - mb(); /* Order data access and bit testing. */ - } - - cpu_data[this_cpu].ipi_count++; - - if (hwrpb->txrdy) - recv_secondary_console_msg(); -} - -void -smp_send_reschedule(int cpu) -{ -#ifdef DEBUG_IPI_MSG - if (cpu == hard_smp_processor_id()) - printk(KERN_WARNING - "smp_send_reschedule: Sending IPI to self.\n"); -#endif - send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE); -} - -void -smp_send_stop(void) -{ - cpumask_t to_whom; - cpumask_copy(&to_whom, cpu_possible_mask); - cpumask_clear_cpu(smp_processor_id(), &to_whom); -#ifdef DEBUG_IPI_MSG - if (hard_smp_processor_id() != boot_cpu_id) - printk(KERN_WARNING "smp_send_stop: Not on boot cpu.\n"); -#endif - send_ipi_message(&to_whom, IPI_CPU_STOP); -} - -void arch_send_call_function_ipi_mask(const struct cpumask *mask) -{ - send_ipi_message(mask, IPI_CALL_FUNC); -} - -void arch_send_call_function_single_ipi(int cpu) -{ - send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE); -} - -static void -ipi_imb(void *ignored) -{ - imb(); -} - -void -smp_imb(void) -{ - /* Must wait other processors to flush their icache before continue. */ - if (on_each_cpu(ipi_imb, NULL, 1)) - printk(KERN_CRIT "smp_imb: timed out\n"); -} -EXPORT_SYMBOL(smp_imb); - -static void -ipi_flush_tlb_all(void *ignored) -{ - tbia(); -} - -void -flush_tlb_all(void) -{ - /* Although we don't have any data to pass, we do want to - synchronize with the other processors. */ - if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) { - printk(KERN_CRIT "flush_tlb_all: timed out\n"); - } -} - -#define asn_locked() (cpu_data[smp_processor_id()].asn_lock) - -static void -ipi_flush_tlb_mm(void *x) -{ - struct mm_struct *mm = (struct mm_struct *) x; - if (mm == current->active_mm && !asn_locked()) - flush_tlb_current(mm); - else - flush_tlb_other(mm); -} - -void -flush_tlb_mm(struct mm_struct *mm) -{ - preempt_disable(); - - if (mm == current->active_mm) { - flush_tlb_current(mm); - if (atomic_read(&mm->mm_users) <= 1) { - int cpu, this_cpu = smp_processor_id(); - for (cpu = 0; cpu < NR_CPUS; cpu++) { - if (!cpu_online(cpu) || cpu == this_cpu) - continue; - if (mm->context[cpu]) - mm->context[cpu] = 0; - } - preempt_enable(); - return; - } - } - - if (smp_call_function(ipi_flush_tlb_mm, mm, 1)) { - printk(KERN_CRIT "flush_tlb_mm: timed out\n"); - } - - preempt_enable(); -} -EXPORT_SYMBOL(flush_tlb_mm); - -struct flush_tlb_page_struct { - struct vm_area_struct *vma; - struct mm_struct *mm; - unsigned long addr; -}; - -static void -ipi_flush_tlb_page(void *x) -{ - struct flush_tlb_page_struct *data = (struct flush_tlb_page_struct *)x; - struct mm_struct * mm = data->mm; - - if (mm == current->active_mm && !asn_locked()) - flush_tlb_current_page(mm, data->vma, data->addr); - else - flush_tlb_other(mm); -} - -void -flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) -{ - struct flush_tlb_page_struct data; - struct mm_struct *mm = vma->vm_mm; - - preempt_disable(); - - if (mm == current->active_mm) { - flush_tlb_current_page(mm, vma, addr); - if (atomic_read(&mm->mm_users) <= 1) { - int cpu, this_cpu = smp_processor_id(); - for (cpu = 0; cpu < NR_CPUS; cpu++) { - if (!cpu_online(cpu) || cpu == this_cpu) - continue; - if (mm->context[cpu]) - mm->context[cpu] = 0; - } - preempt_enable(); - return; - } - } - - data.vma = vma; - data.mm = mm; - data.addr = addr; - - if (smp_call_function(ipi_flush_tlb_page, &data, 1)) { - printk(KERN_CRIT "flush_tlb_page: timed out\n"); - } - - preempt_enable(); -} -EXPORT_SYMBOL(flush_tlb_page); - -void -flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) -{ - /* On the Alpha we always flush the whole user tlb. */ - flush_tlb_mm(vma->vm_mm); -} -EXPORT_SYMBOL(flush_tlb_range); - -static void -ipi_flush_icache_page(void *x) -{ - struct mm_struct *mm = (struct mm_struct *) x; - if (mm == current->active_mm && !asn_locked()) - __load_new_mm_context(mm); - else - flush_tlb_other(mm); -} - -void -flush_icache_user_range(struct vm_area_struct *vma, struct page *page, - unsigned long addr, int len) -{ - struct mm_struct *mm = vma->vm_mm; - - if ((vma->vm_flags & VM_EXEC) == 0) - return; - - preempt_disable(); - - if (mm == current->active_mm) { - __load_new_mm_context(mm); - if (atomic_read(&mm->mm_users) <= 1) { - int cpu, this_cpu = smp_processor_id(); - for (cpu = 0; cpu < NR_CPUS; cpu++) { - if (!cpu_online(cpu) || cpu == this_cpu) - continue; - if (mm->context[cpu]) - mm->context[cpu] = 0; - } - preempt_enable(); - return; - } - } - - if (smp_call_function(ipi_flush_icache_page, mm, 1)) { - printk(KERN_CRIT "flush_icache_page: timed out\n"); - } - - preempt_enable(); -} |