patch-2.1.45 linux/arch/sparc64/kernel/smp.c

• Lines: 348
• Date: Wed Jul 16 19:22:50 1997
• Orig file: v2.1.44/linux/arch/sparc64/kernel/smp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.44/linux/arch/sparc64/kernel/smp.c linux/arch/sparc64/kernel/smp.c
@@ -0,0 +1,347 @@
+/* smp.c: Sparc64 SMP support.
+ *
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#define __KERNEL_SYSCALLS__
+#include <linux/unistd.h>
+
+extern int linux_num_cpus;
+extern void calibrate_delay(void);
+
+volatile int smp_processors_ready = 0;
+unsigned long cpu_present_map = 0;
+int smp_num_cpus = 1;
+int smp_threads_ready = 0;
+
+struct cpuinfo_sparc64 cpu_data[NR_CPUS];
+static unsigned char boot_cpu_id = 0;
+static int smp_activated = 0;
+
+volatile int cpu_number_map[NR_CPUS];
+volatile int cpu_logical_map[NR_CPUS];
+
+struct klock_info klock_info = { KLOCK_CLEAR, 0 };
+
+static volatile int smp_commenced = 0;
+
+void smp_setup(char *str, int *ints)
+{
+	/* XXX implement me XXX */
+}
+
+static char smp_buf[512];
+
+char *smp_info(void)
+{
+	/* XXX not SMP safe and need to support up to 64 penguins */
+	sprintf(smp_buf,
+"        CPU0\t\tCPU1\t\tCPU2\t\tCPU3\n"
+"State:  %s\t\t%s\t\t%s\t\t%s\n",
+(cpu_present_map & 1) ? ((klock_info.akp == 0) ? "akp" : "online") : "offline",
+(cpu_present_map & 2) ? ((klock_info.akp == 1) ? "akp" : "online") : "offline",
+(cpu_present_map & 4) ? ((klock_info.akp == 2) ? "akp" : "online") : "offline",
+(cpu_present_map & 8) ? ((klock_info.akp == 3) ? "akp" : "online") : "offline");
+	return smp_buf;
+}
+
+void smp_store_cpu_info(int id)
+{
+	cpu_data[id].udelay_val = loops_per_sec;
+}
+
+void smp_commence(void)
+{
+	local_flush_cache_all();
+	local_flush_tlb_all();
+	smp_commenced = 1;
+	local_flush_cache_all();
+	local_flush_tlb_all();
+}
+
+static void smp_setup_percpu_timer(void);
+
+static volatile unsigned long callin_flag = 0;
+
+void smp_callin(void)
+{
+	int cpuid = hard_smp_processor_id();
+
+	local_flush_cache_all();
+	local_flush_tlb_all();
+
+	smp_setup_percpu_timer();
+
+	calibrate_delay();
+	smp_store_cpu_info(cpuid);
+	callin_flag = 1;
+	__asm__ __volatile__("membar #Sync\n\t"
+			     "flush  %g6" : : : "memory");
+
+	while(!task[cpuid])
+		barrier();
+	current = task[cpuid];
+
+	while(!smp_commenced)
+		barrier();
+
+	__sti();
+}
+
+extern int cpu_idle(void *unused);
+extern void init_IRQ(void);
+
+void initialize_secondary(void)
+{
+}
+
+int start_secondary(void *unused)
+{
+	trap_init();
+	init_IRQ();
+	smp_callin();
+	return cpu_idle(NULL);
+}
+
+extern struct prom_cpuinfo linux_cpus[NR_CPUS];
+
+void smp_boot_cpus(void)
+{
+	int cpucount = 0, i, first, prev;
+
+	printk("Entering UltraSMPenguin Mode...\n");
+	__sti();
+	cpu_present_map = 0;
+	for(i = 0; i < linux_num_cpus; i++)
+		cpu_present_map |= (1 << i);
+	for(i = 0; i < NR_CPUS; i++) {
+		cpu_number_map[i] = -1;
+		cpu_logical_map[i] = -1;
+	}
+	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();
+
+	if(linux_num_cpus == 1)
+		return;
+
+	for(i = 0; i < NR_CPUS; i++) {
+		if(i == boot_cpu_id)
+			continue;
+
+		if(cpu_present_map & (1 << i)) {
+			extern unsigned long sparc64_cpu_startup;
+			unsigned long entry = (unsigned long)&sparc_cpu_startup;
+			struct task_struct *p;
+			int timeout;
+
+			kernel_thread(start_secondary, NULL, CLONE_PID);
+			p = task[++cpucount];
+			p->processor = i;
+			prom_startcpu(linux_cpus[i].prom_node, entry, i);
+			for(timeout = 0; timeout < 5000000; timeout++) {
+				if(cpu_callin_map[i])
+					break;
+				udelay(100);
+			}
+			if(cpu_callin_map[i]) {
+				/* XXX fix this */
+				cpu_number_map[i] = i;
+				cpu_logical_map[i] = 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;
+		}
+	}
+	if(cpucount == 0) {
+		printk("Error: only one processor found.\n");
+		cpu_present_map = (1 << smp_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;
+		}
+		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;
+	}
+	smp_processors_ready = 1;
+}
+
+/* XXX deprecated interface... */
+void smp_message_pass(int target, int msg, unsigned long data, int wait)
+{
+	printk("smp_message_pass() called, this is bad, spinning.\n");
+	__sti();
+	while(1)
+		barrier();
+}
+
+/* XXX Make it fast later. */
+void smp_cross_call(unsigned long *func, u32 ctx, u64 data1, u64 data2)
+{
+	if(smp_processors_ready) {
+		unsigned long mask;
+		u64 data0 = (((unsigned long)ctx)<<32 |
+			     (((unsigned long)func) & 0xffffffff));
+		u64 pstate;
+		int i, ncpus = smp_num_cpus;
+
+		__asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
+		mask = (cpu_present_map & ~(1 << smp_processor_id()));
+		for(i = 0; i < ncpus; i++) {
+			if(mask & (1 << i)) {
+				u64 target = mid<<14 | 0x70;
+				u64 result;
+
+				__asm__ __volatile__("
+				wrpr	%0, %1, %%pstate
+				wrpr	%%g0, %2, %%asi
+				stxa	%3, [0x40] %%asi
+				stxa	%4, [0x50] %%asi
+				stxa	%5, [0x60] %%asi
+				stxa	%%g0, [%6] %7
+				membar	#Sync"
+				: /* No outputs */
+				: "r" (pstate), "i" (PSTATE_IE), "i" (ASI_UDB_INTR_W),
+				  "r" (data0), "r" (data1), "r" (data2),
+				  "r" (target), "i" (ASI_UDB_INTR_W));
+
+				/* NOTE: PSTATE_IE is still clear. */
+				do {
+					__asm__ __volatile__("ldxa [%%g0] %1, %0",
+						: "=r" (result)
+						: "i" (ASI_INTR_DISPATCH_STAT));
+				} while(result & 0x1);
+				__asm__ __volatile__("wrpr %0, 0x0, %%pstate"
+						     : : "r" (pstate));
+				if(result & 0x2)
+					panic("Penguin NACK's master!");
+			}
+		}
+
+		/* NOTE: Caller runs local copy on master. */
+	}
+}
+
+extern unsigned long xcall_flush_tlb_page;
+extern unsigned long xcall_flush_tlb_mm;
+extern unsigned long xcall_flush_tlb_range;
+extern unsigned long xcall_flush_tlb_all;
+extern unsigned long xcall_flush_cache_all;
+
+void smp_flush_cache_all(void)
+{
+	smp_cross_call(&xcall_flush_cache_all, 0, 0, 0);
+}
+
+void smp_flush_tlb_all(void)
+{
+	smp_cross_call(&xcall_flush_tlb_all, 0, 0, 0);
+}
+
+void smp_flush_tlb_mm(struct mm_struct *mm)
+{
+	u32 ctx = mm->context & 0x1fff;
+	if(mm->cpu_vm_mask != (1 << smp_processor_id()))
+		smp_cross_call(&xcall_flush_tlb_mm, ctx, 0, 0);
+	__flush_tlb_mm(ctx);
+}
+
+void smp_flush_tlb_range(struct mm_struct *mm, unsigned long start,
+			 unsigned long end)
+{
+	u32 ctx = mm->context & 0x1fff;
+	if(mm->cpu_vm_mask != (1 << smp_processor_id()))
+		smp_cross_call(&xcall_flush_tlb_range, ctx, start, end);
+	__flush_tlb_range(ctx, start, end);
+}
+
+void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
+{
+	struct mm_struct *mm = vma->vm_mm;
+	u32 ctx = mm->context & 0x1fff;
+
+	if(mm->cpu_vm_mask != (1 << smp_processor_id()))
+		smp_cross_call(&xcall_flush_tlb_page, ctx, page, 0);
+	__flush_tlb_page(ctx, page);
+}
+
+static spinlock_t ticker_lock = SPIN_LOCK_UNLOCKED;
+
+static inline void sparc64_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);
+	}
+}
+
+unsigned int prof_multiplier[NR_CPUS];
+unsigned int prof_counter[NR_CPUS];
+
+extern void update_one_process(struct task_struct *p, unsigned long ticks,
+			       unsigned long user, unsigned long system);
+
+void smp_percpu_timer_interrupt(struct pt_regs *regs)
+{
+	int cpu = smp_processor_id();
+
+	clear_profile_irq(cpu);
+	if(!user_mode(regs))
+		sparc_do_profile(regs->pc);
+	if(!--prof_counter[cpu]) {
+		int user = user_mode(regs);
+		if(current->pid) {
+			update_one_process(current, 1, user, !user);
+			if(--current->counter < 0) {
+				current->counter = 0;
+				need_resched = 1;
+			}
+
+			spin_lock(&ticker_lock);
+			if(user) {
+				if(current->priority < DEF_PRIORITY)
+					kstat.cpu_nice++;
+				else
+					kstat.cpu_user++;
+			} else {
+				kstat.cpu_system++;
+			}
+			spin_unlock(&ticker_lock);
+		}
+		prof_counter[cpu] = prof_multiplier[cpu];
+	}
+}
+
+static void smp_setup_percpu_timer(void)
+{
+	/* XXX implement me */
+}
+
+int setup_profiling_timer(unsigned int multiplier)
+{
+	/* XXX implement me */
+}