sun4d_smp.c
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上传日期:2013-04-10
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- /* sun4d_smp.c: Sparc SS1000/SC2000 SMP support.
- *
- * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- *
- * Based on sun4m's smp.c, which is:
- * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
- */
- #include <asm/head.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/threads.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <linux/interrupt.h>
- #include <linux/kernel_stat.h>
- #include <linux/init.h>
- #include <linux/spinlock.h>
- #include <linux/mm.h>
- #include <asm/ptrace.h>
- #include <asm/atomic.h>
- #include <asm/delay.h>
- #include <asm/irq.h>
- #include <asm/page.h>
- #include <asm/pgalloc.h>
- #include <asm/pgtable.h>
- #include <asm/oplib.h>
- #include <asm/hardirq.h>
- #include <asm/softirq.h>
- #include <asm/sbus.h>
- #include <asm/sbi.h>
- #define __KERNEL_SYSCALLS__
- #include <linux/unistd.h>
- #define IRQ_CROSS_CALL 15
- extern ctxd_t *srmmu_ctx_table_phys;
- extern int linux_num_cpus;
- extern void calibrate_delay(void);
- extern struct task_struct *current_set[NR_CPUS];
- extern volatile int smp_processors_ready;
- extern unsigned long cpu_present_map;
- extern int smp_num_cpus;
- static int smp_highest_cpu;
- extern int smp_threads_ready;
- extern unsigned char mid_xlate[NR_CPUS];
- extern volatile unsigned long cpu_callin_map[NR_CPUS];
- extern unsigned long smp_proc_in_lock[NR_CPUS];
- extern struct cpuinfo_sparc cpu_data[NR_CPUS];
- extern unsigned long cpu_offset[NR_CPUS];
- extern unsigned char boot_cpu_id;
- extern int smp_activated;
- extern volatile int __cpu_number_map[NR_CPUS];
- extern volatile int __cpu_logical_map[NR_CPUS];
- extern volatile unsigned long ipi_count;
- extern volatile int smp_process_available;
- extern volatile int smp_commenced;
- extern int __smp4d_processor_id(void);
- extern unsigned long totalram_pages;
- /* #define SMP_DEBUG */
- #ifdef SMP_DEBUG
- #define SMP_PRINTK(x) printk x
- #else
- #define SMP_PRINTK(x)
- #endif
- static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
- {
- __asm__ __volatile__("swap [%1], %0nt" :
- "=&r" (val), "=&r" (ptr) :
- "0" (val), "1" (ptr));
- return val;
- }
- static void smp_setup_percpu_timer(void);
- extern void cpu_probe(void);
- extern void sun4d_distribute_irqs(void);
- void __init smp4d_callin(void)
- {
- int cpuid = hard_smp4d_processor_id();
- extern spinlock_t sun4d_imsk_lock;
- unsigned long flags;
-
- /* Show we are alive */
- cpu_leds[cpuid] = 0x6;
- show_leds(cpuid);
- /* Enable level15 interrupt, disable level14 interrupt for now */
- cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
- local_flush_cache_all();
- local_flush_tlb_all();
- /*
- * Unblock the master CPU _only_ when the scheduler state
- * of all secondary CPUs will be up-to-date, so after
- * the SMP initialization the master will be just allowed
- * to call the scheduler code.
- */
- init_idle();
- /* Get our local ticker going. */
- smp_setup_percpu_timer();
- calibrate_delay();
- smp_store_cpu_info(cpuid);
- local_flush_cache_all();
- local_flush_tlb_all();
- /* Allow master to continue. */
- swap((unsigned long *)&cpu_callin_map[cpuid], 1);
- local_flush_cache_all();
- local_flush_tlb_all();
-
- cpu_probe();
- while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
- barrier();
-
- while(current_set[cpuid]->processor != cpuid)
- barrier();
-
- /* Fix idle thread fields. */
- __asm__ __volatile__("ld [%0], %%g6nt"
- "sta %%g6, [%%g0] %1nt"
- : : "r" (¤t_set[cpuid]), "i" (ASI_M_VIKING_TMP2)
- : "memory" /* paranoid */);
- cpu_leds[cpuid] = 0x9;
- show_leds(cpuid);
-
- /* Attach to the address space of init_task. */
- atomic_inc(&init_mm.mm_count);
- current->active_mm = &init_mm;
- local_flush_cache_all();
- local_flush_tlb_all();
-
- __sti(); /* We don't allow PIL 14 yet */
-
- while(!smp_commenced)
- barrier();
- spin_lock_irqsave(&sun4d_imsk_lock, flags);
- cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
- spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
- }
- extern int cpu_idle(void *unused);
- extern void init_IRQ(void);
- extern void cpu_panic(void);
- extern int start_secondary(void *unused);
- /*
- * Cycle through the processors asking the PROM to start each one.
- */
-
- extern struct prom_cpuinfo linux_cpus[NR_CPUS];
- extern struct linux_prom_registers smp_penguin_ctable;
- extern unsigned long trapbase_cpu1[];
- extern unsigned long trapbase_cpu2[];
- extern unsigned long trapbase_cpu3[];
- void __init smp4d_boot_cpus(void)
- {
- int cpucount = 0;
- int i = 0;
- printk("Entering SMP Mode...n");
-
- for (i = 0; i < NR_CPUS; i++)
- cpu_offset[i] = (char *)&cpu_data[i] - (char *)&cpu_data;
-
- if (boot_cpu_id)
- current_set[0] = NULL;
- __sti();
- cpu_present_map = 0;
- for(i=0; i < linux_num_cpus; i++)
- cpu_present_map |= (1<<linux_cpus[i].mid);
- SMP_PRINTK(("cpu_present_map %08lxn", cpu_present_map));
- for(i=0; i < NR_CPUS; i++)
- __cpu_number_map[i] = -1;
- for(i=0; i < NR_CPUS; i++)
- __cpu_logical_map[i] = -1;
- for(i=0; i < NR_CPUS; i++)
- mid_xlate[i] = i;
- __cpu_number_map[boot_cpu_id] = 0;
- __cpu_logical_map[0] = boot_cpu_id;
- current->processor = boot_cpu_id;
- smp_store_cpu_info(boot_cpu_id);
- smp_setup_percpu_timer();
- init_idle();
- local_flush_cache_all();
- if(linux_num_cpus == 1)
- return; /* Not an MP box. */
- SMP_PRINTK(("Iterating over CPUsn"));
- for(i = 0; i < NR_CPUS; i++) {
- if(i == boot_cpu_id)
- continue;
- if(cpu_present_map & (1 << i)) {
- extern unsigned long sun4d_cpu_startup;
- unsigned long *entry = &sun4d_cpu_startup;
- struct task_struct *p;
- int timeout;
- int no;
- /* Cook up an idler for this guy. */
- kernel_thread(start_secondary, NULL, CLONE_PID);
- cpucount++;
- p = init_task.prev_task;
- init_tasks[i] = p;
- p->processor = i;
- p->cpus_runnable = 1 << i; /* we schedule the first task manually */
- current_set[i] = p;
- del_from_runqueue(p);
- unhash_process(p);
- for (no = 0; no < linux_num_cpus; no++)
- if (linux_cpus[no].mid == i)
- break;
- /*
- * Initialize the contexts table
- * Since the call to prom_startcpu() trashes the structure,
- * we need to re-initialize it for each cpu
- */
- smp_penguin_ctable.which_io = 0;
- smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
- smp_penguin_ctable.reg_size = 0;
- /* whirrr, whirrr, whirrrrrrrrr... */
- SMP_PRINTK(("Starting CPU %d at %p task %d node %08xn", i, entry, cpucount, linux_cpus[no].prom_node));
- local_flush_cache_all();
- prom_startcpu(linux_cpus[no].prom_node,
- &smp_penguin_ctable, 0, (char *)entry);
-
- SMP_PRINTK(("prom_startcpu returned :)n"));
- /* wheee... it's going... */
- for(timeout = 0; timeout < 10000; timeout++) {
- if(cpu_callin_map[i])
- break;
- udelay(200);
- }
-
- if(cpu_callin_map[i]) {
- /* Another "Red Snapper". */
- __cpu_number_map[i] = cpucount;
- __cpu_logical_map[cpucount] = i;
- } else {
- cpucount--;
- printk("Processor %d is stuck.n", i);
- }
- }
- if(!(cpu_callin_map[i])) {
- cpu_present_map &= ~(1 << i);
- __cpu_number_map[i] = -1;
- }
- }
- local_flush_cache_all();
- if(cpucount == 0) {
- printk("Error: only one Processor found.n");
- cpu_present_map = (1 << hard_smp4d_processor_id());
- } else {
- unsigned long bogosum = 0;
-
- for(i = 0; i < NR_CPUS; i++) {
- if(cpu_present_map & (1 << i)) {
- bogosum += cpu_data[i].udelay_val;
- smp_highest_cpu = i;
- }
- }
- SMP_PRINTK(("Total of %d Processors activated (%lu.%02lu BogoMIPS).n", cpucount + 1, bogosum/(500000/HZ), (bogosum/(5000/HZ))%100));
- printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).n",
- cpucount + 1,
- bogosum/(500000/HZ),
- (bogosum/(5000/HZ))%100);
- smp_activated = 1;
- smp_num_cpus = cpucount + 1;
- }
- /* Free unneeded trap tables */
- ClearPageReserved(virt_to_page(trapbase_cpu1));
- set_page_count(virt_to_page(trapbase_cpu1), 1);
- free_page((unsigned long)trapbase_cpu1);
- totalram_pages++;
- num_physpages++;
- ClearPageReserved(virt_to_page(trapbase_cpu2));
- set_page_count(virt_to_page(trapbase_cpu2), 1);
- free_page((unsigned long)trapbase_cpu2);
- totalram_pages++;
- num_physpages++;
- ClearPageReserved(virt_to_page(trapbase_cpu3));
- set_page_count(virt_to_page(trapbase_cpu3), 1);
- free_page((unsigned long)trapbase_cpu3);
- totalram_pages++;
- num_physpages++;
- /* Ok, they are spinning and ready to go. */
- smp_processors_ready = 1;
- sun4d_distribute_irqs();
- }
- static struct smp_funcall {
- smpfunc_t func;
- unsigned long arg1;
- unsigned long arg2;
- unsigned long arg3;
- unsigned long arg4;
- unsigned long arg5;
- unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */
- unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
- } ccall_info __attribute__((aligned(8)));
- static spinlock_t cross_call_lock = SPIN_LOCK_UNLOCKED;
- /* Cross calls must be serialized, at least currently. */
- void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
- unsigned long arg3, unsigned long arg4, unsigned long arg5)
- {
- if(smp_processors_ready) {
- register int high = smp_highest_cpu;
- unsigned long flags;
- spin_lock_irqsave(&cross_call_lock, flags);
- {
- /* If you make changes here, make sure gcc generates proper code... */
- smpfunc_t f asm("i0") = func;
- unsigned long a1 asm("i1") = arg1;
- unsigned long a2 asm("i2") = arg2;
- unsigned long a3 asm("i3") = arg3;
- unsigned long a4 asm("i4") = arg4;
- unsigned long a5 asm("i5") = arg5;
-
- __asm__ __volatile__("
- std %0, [%6]
- std %2, [%6 + 8]
- std %4, [%6 + 16]" : :
- "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
- "r" (&ccall_info.func));
- }
- /* Init receive/complete mapping, plus fire the IPI's off. */
- {
- register unsigned long mask;
- register int i;
- mask = (cpu_present_map & ~(1 << hard_smp4d_processor_id()));
- for(i = 0; i <= high; i++) {
- if(mask & (1 << i)) {
- ccall_info.processors_in[i] = 0;
- ccall_info.processors_out[i] = 0;
- sun4d_send_ipi(i, IRQ_CROSS_CALL);
- }
- }
- }
- {
- register int i;
- i = 0;
- do {
- while(!ccall_info.processors_in[i])
- barrier();
- } while(++i <= high);
- i = 0;
- do {
- while(!ccall_info.processors_out[i])
- barrier();
- } while(++i <= high);
- }
- spin_unlock_irqrestore(&cross_call_lock, flags);
- }
- }
- /* Running cross calls. */
- void smp4d_cross_call_irq(void)
- {
- int i = hard_smp4d_processor_id();
- ccall_info.processors_in[i] = 1;
- ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
- ccall_info.arg4, ccall_info.arg5);
- ccall_info.processors_out[i] = 1;
- }
- static int smp4d_stop_cpu_sender;
- static void smp4d_stop_cpu(void)
- {
- int me = hard_smp4d_processor_id();
-
- if (me != smp4d_stop_cpu_sender)
- while(1) barrier();
- }
- /* Cross calls, in order to work efficiently and atomically do all
- * the message passing work themselves, only stopcpu and reschedule
- * messages come through here.
- */
- void smp4d_message_pass(int target, int msg, unsigned long data, int wait)
- {
- int me = hard_smp4d_processor_id();
- SMP_PRINTK(("smp4d_message_pass %d %d %08lx %dn", target, msg, data, wait));
- if (msg == MSG_STOP_CPU && target == MSG_ALL_BUT_SELF) {
- unsigned long flags;
- static spinlock_t stop_cpu_lock = SPIN_LOCK_UNLOCKED;
- spin_lock_irqsave(&stop_cpu_lock, flags);
- smp4d_stop_cpu_sender = me;
- smp4d_cross_call((smpfunc_t)smp4d_stop_cpu, 0, 0, 0, 0, 0);
- spin_unlock_irqrestore(&stop_cpu_lock, flags);
- }
- printk("Yeeee, trying to send SMP msg(%d) to %d on cpu %dn", msg, target, me);
- panic("Bogon SMP message pass.");
- }
- extern unsigned int prof_multiplier[NR_CPUS];
- extern unsigned int prof_counter[NR_CPUS];
- extern void sparc_do_profile(unsigned long pc, unsigned long o7);
- void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
- {
- int cpu = hard_smp4d_processor_id();
- static int cpu_tick[NR_CPUS];
- static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
- bw_get_prof_limit(cpu);
- bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */
- cpu_tick[cpu]++;
- if (!(cpu_tick[cpu] & 15)) {
- if (cpu_tick[cpu] == 0x60)
- cpu_tick[cpu] = 0;
- cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
- show_leds(cpu);
- }
- if(!user_mode(regs))
- sparc_do_profile(regs->pc, regs->u_regs[UREG_RETPC]);
- if(!--prof_counter[cpu]) {
- int user = user_mode(regs);
- irq_enter(cpu, 0);
- update_process_times(user);
- irq_exit(cpu, 0);
- prof_counter[cpu] = prof_multiplier[cpu];
- }
- }
- extern unsigned int lvl14_resolution;
- static void __init smp_setup_percpu_timer(void)
- {
- int cpu = hard_smp4d_processor_id();
- prof_counter[cpu] = prof_multiplier[cpu] = 1;
- load_profile_irq(cpu, lvl14_resolution);
- }
- void __init smp4d_blackbox_id(unsigned *addr)
- {
- int rd = *addr & 0x3e000000;
-
- addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */
- addr[1] = 0x01000000; /* nop */
- addr[2] = 0x01000000; /* nop */
- }
- void __init smp4d_blackbox_current(unsigned *addr)
- {
- /* We have a nice Linux current register :) */
- int rd = addr[1] & 0x3e000000;
-
- addr[0] = 0x10800006; /* b .+24 */
- addr[1] = 0xc0800820 | rd; /* lda [%g0] ASI_M_VIKING_TMP2, reg */
- }
- void __init sun4d_init_smp(void)
- {
- int i;
- extern unsigned int patchme_store_new_current[];
- extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
- /* Store current into Linux current register :) */
- __asm__ __volatile__("sta %%g6, [%%g0] %0" : : "i"(ASI_M_VIKING_TMP2));
-
- /* Patch switch_to */
- patchme_store_new_current[0] = (patchme_store_new_current[0] & 0x3e000000) | 0xc0a00820;
-
- /* Patch ipi15 trap table */
- t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
-
- /* And set btfixup... */
- BTFIXUPSET_BLACKBOX(smp_processor_id, smp4d_blackbox_id);
- BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
- BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(smp_message_pass, smp4d_message_pass, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(__smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
-
- for (i = 0; i < NR_CPUS; i++) {
- ccall_info.processors_in[i] = 1;
- ccall_info.processors_out[i] = 1;
- }
- }