patch-2.1.97 linux/arch/sparc/kernel/sun4d_smp.c

• Lines: 577
• Date: Tue Apr 14 17:44:19 1998
• Orig file: v2.1.96/linux/arch/sparc/kernel/sun4d_smp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.96/linux/arch/sparc/kernel/sun4d_smp.c linux/arch/sparc/kernel/sun4d_smp.c
@@ -0,0 +1,576 @@
+/* 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 <linux/config.h> /* for CONFIG_PROFILE */
+#include <asm/head.h>
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/tasks.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/init.h>
+
+#include <asm/ptrace.h>
+#include <asm/atomic.h>
+
+#include <asm/delay.h>
+#include <asm/irq.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/oplib.h>
+#include <asm/atops.h>
+#include <asm/spinlock.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 = 0;
+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 struct klock_info klock_info;
+extern volatile unsigned long ipi_count;
+extern volatile int smp_process_available;
+extern volatile int smp_commenced;
+extern int __smp4d_processor_id(void);
+
+/* #define SMP_DEBUG */
+
+#ifdef SMP_DEBUG
+#define SMP_PRINTK(x)	printk x
+#else
+#define SMP_PRINTK(x)
+#endif
+
+int smp4d_bogo_info(char *buf)
+{
+	int len = 0, i;
+	
+	for (i = 0; i < NR_CPUS; i++)
+		if (cpu_present_map & (1 << i))
+			len += sprintf(buf + len, "Cpu%dBogo\t: %lu.%02lu\n", 
+					i,
+					cpu_data[i].udelay_val/500000,
+					(cpu_data[i].udelay_val/5000)%100);
+	return len;
+}
+
+int smp4d_info(char *buf)
+{
+	int len = 0, i;
+	
+	for (i = 0; i < NR_CPUS; i++)
+		if (cpu_present_map & (1 << i))
+			len += sprintf(buf + len, "CPU%d\t\t: %s\n", 
+					i,
+					(klock_info.akp == i) ? "akp" : "online");
+	return len;
+}
+
+static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
+{
+	__asm__ __volatile__("swap [%1], %0\n\t" :
+			     "=&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);
+
+__initfunc(void 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();
+
+	/* 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], %%g6\n\t"
+			     "sta %%g6, [%%g0] %1\n\t"
+			     : : "r" (&current_set[cpuid]), "i" (ASI_M_VIKING_TMP2)
+			     : "memory" /* paranoid */);
+
+	cpu_leds[cpuid] = 0x9;
+	show_leds(cpuid);
+	
+	current->mm->mmap->vm_page_prot = PAGE_SHARED;
+	current->mm->mmap->vm_start = PAGE_OFFSET;
+	current->mm->mmap->vm_end = init_task.mm->mmap->vm_end;
+	
+	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[];
+
+__initfunc(void smp4d_boot_cpus(void))
+{
+	int cpucount = 0;
+	int i = 0;
+
+	printk("Entering SMP Mode...\n");
+	
+	smp_penguin_ctable.which_io = 0;
+	smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
+	smp_penguin_ctable.reg_size = 0;
+
+	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 %08lx\n", 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;
+	klock_info.akp = boot_cpu_id;
+	current->processor = boot_cpu_id;
+	smp_store_cpu_info(boot_cpu_id);
+	smp_setup_percpu_timer();
+	local_flush_cache_all();
+	if(linux_num_cpus == 1)
+		return;  /* Not an MP box. */
+	SMP_PRINTK(("Iterating over CPUs\n"));
+	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);
+
+			p = task[++cpucount];
+
+			p->processor = i;
+			current_set[i] = p;
+			
+			for (no = 0; no < linux_num_cpus; no++)
+				if (linux_cpus[no].mid == i)
+					break;
+			
+			/* whirrr, whirrr, whirrrrrrrrr... */
+			SMP_PRINTK(("Starting CPU %d at %p task %d node %08x\n", 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 < 5000000; timeout++) {
+				if(cpu_callin_map[i])
+					break;
+				udelay(100);
+			}
+			
+			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 + 2500)/500000, ((bogosum + 2500)/5000)%100));
+		printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
+		       cpucount + 1,
+		       (bogosum + 2500)/500000,
+		       ((bogosum + 2500)/5000)%100);
+		smp_activated = 1;
+		smp_num_cpus = cpucount + 1;
+	}
+
+	/* Free unneeded trap tables */
+	
+	mem_map[MAP_NR((unsigned long)trapbase_cpu1)].flags &= ~(1 << PG_reserved);
+	free_page((unsigned long)trapbase_cpu1);
+	mem_map[MAP_NR((unsigned long)trapbase_cpu2)].flags &= ~(1 << PG_reserved);
+	free_page((unsigned long)trapbase_cpu2);
+	mem_map[MAP_NR((unsigned long)trapbase_cpu3)].flags &= ~(1 << PG_reserved);
+	free_page((unsigned long)trapbase_cpu3);
+
+	/* 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);
+				}
+			}
+		}
+
+		/* First, run local copy. */
+		func(arg1, arg2, arg3, arg4, arg5);
+
+		{
+			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);
+	} else
+		func(arg1, arg2, arg3, arg4, arg5); /* Just need to run local copy. */
+}
+
+/* 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 %d\n", 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 %d\n", msg, target, me);
+	panic("Bogon SMP message pass.");
+}
+
+/* Protects counters touched during level14 ticker */
+static spinlock_t ticker_lock = SPIN_LOCK_UNLOCKED;
+
+#ifdef CONFIG_PROFILE
+
+/* 32-bit Sparc specific profiling function. */
+static inline void sparc_do_profile(unsigned long pc)
+{
+	if(prof_buffer && current->pid) {
+		extern int _stext;
+
+		pc -= (unsigned long) &_stext;
+		pc >>= prof_shift;
+
+		spin_lock(&ticker_lock);
+		if(pc < prof_len)
+			prof_buffer[pc]++;
+		else
+			prof_buffer[prof_len - 1]++;
+		spin_unlock(&ticker_lock);
+	}
+}
+
+#endif
+
+extern unsigned int prof_multiplier[NR_CPUS];
+extern unsigned int prof_counter[NR_CPUS];
+
+extern void update_one_process(struct task_struct *p, unsigned long ticks,
+			       unsigned long user, unsigned long system,
+			       int cpu);
+			       
+
+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);
+	}
+
+#ifdef CONFIG_PROFILE
+	if(!user_mode(regs))
+		sparc_do_profile(regs->pc);
+#endif
+	if(!--prof_counter[cpu]) {
+		int user = user_mode(regs);
+		if(current->pid) {
+			update_one_process(current, 1, user, !user, cpu);
+
+			if(--current->counter < 0) {
+				current->counter = 0;
+				need_resched = 1;
+			}
+
+			spin_lock(&ticker_lock);
+			if(user) {
+				if(current->priority < DEF_PRIORITY) {
+					kstat.cpu_nice++;
+					kstat.per_cpu_nice[cpu]++;
+				} else {
+					kstat.cpu_user++;
+					kstat.per_cpu_user[cpu]++;
+				}
+			} else {
+				kstat.cpu_system++;
+				kstat.per_cpu_system[cpu]++;
+			}
+			spin_unlock(&ticker_lock);
+		}
+		prof_counter[cpu] = prof_multiplier[cpu];
+	}
+}
+
+extern unsigned int lvl14_resolution;
+
+__initfunc(static void smp_setup_percpu_timer(void))
+{
+	int cpu = hard_smp4d_processor_id();
+
+	prof_counter[cpu] = prof_multiplier[cpu] = 1;
+	load_profile_irq(cpu, lvl14_resolution);
+}
+
+__initfunc(void 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 */
+}
+
+__initfunc(void 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 */
+}
+
+__initfunc(void 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_bogo_info, smp4d_bogo_info, BTFIXUPCALL_NORM);
+	BTFIXUPSET_CALL(smp_info, smp4d_info, 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;
+	}
+}